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Free Piston Electric Power Generator Set & Combustion Research

2021

A demonstration video of the High efficiency fuel flexible free piston engine generator developed at Durham Energy Institute
https://www.youtube.com/watch?v=eV7f3tOUEbU

Aquarius Engines Signs Deal With Honda-affiliate To Develop Electricity Generators
https://www.prnewswire.com/il/news-releases/aquarius-engines-signs-deal-with-honda-affiliate-to-develop-electricity-generators-301210733.html

Under the skin: Why free-piston engines could at long last be relevant.
https://www.autocar.co.uk/car-news/technology-news/under-skin-why-free-piston-engines-could-long-last-be-relevant

Libertine demonstrates technology to help heavy-duty vehicles go ‘fossil free’, enables improved cold start with bioethanol
https://www.automotiveworld.com/news-releases/truck-bus-news-releases/libertine-demonstrates-technology-to-help-heavy-duty-vehicles-go-fossil-free-enables-improved-cold-start-with-bioethanol/

16MO1: Free Piston Engine Based on Off-Road Vehicles
https://www.ccefp.org/research/mobile/16mo1/

New Engine Control Technology Could Improve Cold Starts for Heavy-Duty Vehicles
https://www.oemoffhighway.com/engines/news/21221130/new-engine-control-technology-could-improve-cold-starts-for-heavyduty-vehicles

Aero Engine Concepts Beyond 2030: Part 2—The Free-Piston Composite Cycle Engine
https://asmedigitalcollection.asme.org/gasturbinespower/article-abstract/143/2/021002/1089763/Aero-Engine-Concepts-Beyond-2030-Part-2-The-Free?redirectedFrom=fulltext

Advances in free-piston internal combustion engines: A comprehensive review
https://www.sciencedirect.com/science/article/abs/pii/S1359431121001344

Effect of the stroke-to-bore ratio on the performance of a dual-piston free piston engine generator.
https://www.sciencedirect.com/science/article/abs/pii/S1359431120339326

A Novel Sensorless Stroke Detection Technique Using Low-Cost Inductive Coil for Resonant Free-Piston Machines
https://ieeexplore.ieee.org/document/8962322

Free piston device
https://patents.google.com/patent/US10890070

 

2020

Experimental investigation of operating characteristics and thermal balance of a miniature free-piston linear engine
https://www.sciencedirect.com/science/article/abs/pii/S1359431120330908

A Unique Engine Is Bringing Power to a Remote Philippine Island
https://www.bloomberg.com/news/articles/2020-06-01/a-unique-engine-is-bringing-power-to-a-remote-philippine-island

AQUARIUS ENGINES Energy Generation
https://www.aquariusengines.com/

Realization of a Novel Free-Piston Engine Generator for Hybrid-Electric Vehicle Applications
https://pubs.acs.org/doi/10.1021/acs.energyfuels.0c01647

Piston motion control for a dual free piston linear generator: predictive-fuzzy logic control approach
https://link.springer.com/article/10.1007/s12206-020-1035-1

A Starting Control Strategy of Single-Cylinder Two-Stroke Free-Piston Engine Generator
https://www.researchgate.net/publication/338382706_A_Starting_Control_Strategy_of_Single-Cylinder_Two-Stroke_Free-Piston_Engine_Generator

Multi Cycle Modeling, Simulating and Controlling of a Free Piston Engine with Electrical Generator under HCCI Combustion Conditions
https://www.tandfonline.com/doi/abs/10.1080/00102202.2019.1627340

Resonant Combustion Start Considering PotentialEnergy of Free-Piston Engine Generator
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjd6tXtsczvAhWeSTABHXAwAaE QFjAHegQICRAD&url=https%3A%2F%2Fwww.mdpi.com%2F1996-1073%2F13%2F21%2F5754%2Fpdf&usg=AOvVaw2QN8QqaCZsPbsqIKUvrUI_

Feasibility of Multiple Piston Motion Control Approaches in a Free Piston Engine Generator
https://ukdiss.com/examples/feasibility-of-multiple-piston-motion-control-approaches-in-a-free-piston-engine-generator.php

Development of Resonating Oscillating Linear Engine Alternator; Development of Resonating Oscillating Linear Engine Alternator; Instrumentation and Control Instrumentation and Control
https://researchrepository.wvu.edu/cgi/viewcontent.cgi?article=8254&context=etd

Effects of Injector Spray Angle on Performance of an Opposed-Piston Free-Piston Engine
https://www.mdpi.com/1996-1073/13/14/3735

Electromagnetic Characteristics Analysis of a Tubular Moving Magnet Linear Generator System
https://www.mdpi.com/2076-3417/10/11/3713

A Reciprocating Motion Control Strategy of Single-Cylinder Free-Piston Engine Generator
https://www.mdpi.com/2079-9292/9/2/245

Numerical Investigation of a Free-Piston Hydrogen-Gasoline Engine Linear Generator
https://www.mdpi.com/1996-1073/13/18/4685

Development of free piston engine linear generator system and a resonant pendulum type control method
https://journals.sagepub.com/doi/abs/10.1177/1468087420931247

Advanced combustion free-piston engines: A comprehensive review
https://journals.sagepub.com/doi/full/10.1177/1468087418800612

Experimental investigation of operating characteristics and thermal balance of a miniature free-piston linear engine
https://www.sciencedirect.com/science/article/abs/pii/S1359431120330908

Compression Ratio Control of Free Piston Linear Generator with In-Cylinder Pressure Feedforward
https://www.sae.org/publications/technical-papers/content/08-07-02-0008/

Coupled dynamic effect of combustion variation on gas exchange stability of a free piston linear engine.
https://www.sciencedirect.com/science/article/abs/pii/S1359431119383838

Investigation of the optimum operating condition of a dual piston type free piston engine generator during engine cold start-up process
https://www.sciencedirect.com/science/article/abs/pii/S1359431120336048

A Preliminary Study of a Two Stroke Free-Piston Engine for Electricity Generation
https://ieeexplore.ieee.org/document/9303112

Control of Piston Trajectory in a Free-Piston Linear Electric Generator by Load Current Modulation
https://ieeexplore.ieee.org/document/9250983

Comparison of Halbach, Radial and Axial Magnet Arrangement for Single Phase Tubular Permanent Magnet Linear Alternators
https://ieeexplore.ieee.org/document/9320008

Improvement of Thermal Efficiency via High-Frequency Driving of Mover in Free-Piston Engine Linear Generator
https://ieeexplore.ieee.org/document/9290954

Efficient Motion Control of a PMSM and Design of a Mechanic Energy Storage for a Four Stroke Free Piston Engine
https://ieeexplore.ieee.org/document/9161742

A Plate Moving-Magnet Linear Generator Designed for Free-Piston Engines
https://ieeexplore.ieee.org/document/9072162

Compression Ratio Control of an Opposed-Piston Free-Piston Engine Generator Based on Artificial Neural Networks
https://ieeexplore.ieee.org/document/9114989

Evaluation of Trajectory Based Combustion Control for Electrical Free Piston Engine
https://www.sae.org/publications/technical-papers/content/2020-01-1149/

Piston Durability Analysis including Side-Thrust Loads
https://www.sae.org/publications/technical-papers/content/2019-32-0585/

Pre-design Investigation of Resonant Frequency Effects on Gas Exchange Efficiencies of a One-kW Natural-Gas Linear Engine Alternator
https://www.sae.org/publications/technical-papers/content/2020-01-0488/

Comparative Research on Emission Characteristic and Combustion Characteristic of Gasoline Direct Injection and Port Fuel Injection for Free-Piston Linear Generator
https://www.sae.org/publications/technical-papers/content/2020-01-2220/

Homogeneous charge compression ignition linear generator
https://patents.google.com/patent/US10815878

Free-piston device and method for operating a free-piston device.
https://patents.google.com/patent/US10605081

Free piston device and method for operating a free piston device.
https://patents.google.com/patent/US10612380

Control of piston trajectory in a free-piston combustion engine
https://patents.google.com/patent/US10731586

Device in a heat cycle for converting heat into electrical energy.
https://patents.google.com/patent/US10630145

Free piston engine power plant
https://patents.google.com/patent/US10871106

Homogeneous charge compression ignition linear generator
https://patents.google.com/patent/US10815878

High-efficiency linear combustion engine
https://patents.google.com/patent/US10851708

Free piston apparatus
https://patents.google.com/patent/US10844718

Free-piston linear apparatus
https://patents.google.com/patent/US10837356

Homogeneous charge compression ignition linear generator
https://patents.google.com/patent/US10815878

Power generation system and electricity generation system using the power generation system.
https://patents.google.com/patent/US10767483

Piston rod and free piston engine
https://patents.google.com/patent/US10641166

2019

Aquarius Superlight micro engine that is powerful enough to drive a Fiesta for 1,200km without refuelling.
https://www.youtube.com/watch?v=ne2VFBadLnQ

Musashi Seimitsu and Aquarius sign deal to develop free piston engine.
https://www.autoblog.com/2019/11/28/aquarius-engine-musashi-seimitsu-free-piston-linear-generator/

The Car Engine of Tomorrow: Cleaner, Lighter, With One Moving Part
https://www.wsj.com/articles/the-car-engine-of-tomorrow-cleaner-lighter-with-one-moving-part-11561039041

An internal combustion alternator with both free piston and cylinder
https://www.sciencedirect.com/science/article/pii/S2215098618308966

Advanced control platform for next generation Free Piston Engines (FPEs) for clean and efficient power generation
https://cordis.europa.eu/project/id/855055

Two-Stroke Thermodynamic Cycle Optimization of a Single-Cylinder Free-Piston Engine Generator
https://www.hindawi.com/journals/amse/2019/9783246/

A Review on Design and Development of Free Piston Linear Generators in Hybrid Vehicles
https://iopscience.iop.org/article/10.1088/1757-899X/691/1/012053/pdf

Multi Cycle Modeling, Simulating and Controlling of a Free Piston Engine with Electrical Generator under HCCI Combustion Conditions
https://www.tandfonline.com/doi/full/10.1080/00102202.2019.1627340?scroll=top&needAccess=true

Electromagnetic Characteristics of Permanent Magnet Linear Generator (PMLG) Applied to Free-Piston Engine (FPE)
https://ieeexplore.ieee.org/document/8681428

A Tubular PM Linear Generator With a Coreless Moving-Coil for Free-Piston Engines
https://ieeexplore.ieee.org/document/8611372

Examination of a Free-piston Engine Linear Generator System with Opposite-side Combustion
https://ieeexplore.ieee.org/abstract/document/8770978

Linear Generator Design for a Free-Piston Engine with high Force Density
https://ieeexplore.ieee.org/document/8770996

An Investigation of Short Translator Linear Machines for Use in a Free Piston Engine
https://ieeexplore.ieee.org/document/8785125

Simulation and Experimental Validation of Equivalent Circuit Parameters and Core Loss in a Tubular Permanent Magnet Linear Generator for Free Piston Engine Applications
https://ieeexplore.ieee.org/document/8785345

Research on Model of Free Piston Linear Generator based on Location Domain and Real-Time Motion Control Strategy
https://ieeexplore.ieee.org/document/8796917

Analysis of Neutral position, Magnet – Spacer of Tubular Permanent Magnet Linear generator for FPE applications
https://ieeexplore.ieee.org/document/8781327

Research on Thrust Fluctuation and Thermal Field of Tubular Permanent Magnet Linear Machine
https://ieeexplore.ieee.org/document/8922132

Mover Optimization and Mechanical Strength Analysis of a Tubular Permanent-Magnet Linear Motor
https://ieeexplore.ieee.org/document/8922180

A Double-Sided Flat Permanent Magnet Linear Motor with Dual Halbach for Free-Piston Linear Generator
https://ieeexplore.ieee.org/document/9014682

XFlux Material based Permanent Magnet Linear Electrical Generator Connected to a Single Piston Hydraulic Free Piston Engine
https://ieeexplore.ieee.org/document/9071931

Sensitivity Analysis and Control Methodology for Linear Engine Alternator
https://www.sae.org/publications/technical-papers/content/2019-01-0230/

Quantification of Windage and Vibrational Losses in Flexure Springs of a One kW Two-Stroke Free Piston Linear Engine Alternator
https://www.sae.org/publications/technical-papers/content/2019-01-0816/

Understanding HCCI Combustion in a Free Piston Engine with a Multi-Zone, Control-Mass Model with Thermal Stratification and Chemical Kinetics
https://www.sae.org/publications/technical-papers/content/2019-01-0958/

Feasibility of Multiple Piston Motion Control Approaches in a Free Piston Engine Generator
 https://www.sae.org/publications/technical-papers/content/2019-01-2599/

Systems and methods for transient control of a free-piston engine
https://patents.google.com/patent/US10202897

Gapless piston ring for internal combustion engine
https://patents.google.com/patent/US10280751

Control of piston trajectory in a free-piston combustion engine
https://patents.google.com/patent/US10408150

Compact ported cylinder construction for an opposed-piston engine
https://patents.google.com/patent/US10422272

Free piston device
https://patents.google.com/patent/US10472995

Lightweight return flux alternator
https://patents.google.com/patent/US10498208

High-efficiency linear combustion engine
https://patents.google.com/patent/US10851708

 

2018

Aquarius Engines a revolutionary engine for power generation engine
https://www.youtube.com/watch?v=26PjRQmIoeE
AND
https://www.youtube.com/watch?v=KUfiYGUTgZc

Efficient Engine Startup EtaGen Attracts High-Profile Strategic Investors
https://www.greentechmedia.com/articles/read/efficient-engine-startup-khosla-gates-statoil-aep-investors

16MO1: Free Piston Engine Based on Off-Road Vehicles
https://www.ccefp.org/research/mobile/16mo1/

A review on free piston linear engine (FPLE)
https://research.brighton.ac.uk/en/publications/a-review-on-free-piston-linear-engine-fple
and
https://aip.scitation.org/doi/10.1063/1.5075574

A review on the operating characteristics of free piston engine and its recent developments
https://aip.scitation.org/doi/10.1063/1.5075563

EVALUATING THE EFFICIENCY OF A LINEAR BASED ALTERNATOR IN A FREE PISTON ENGINE CONFIGURATION
http://ir.cut.ac.za/bitstream/handle/11462/1906/Kukuni%2C%20Tshepo%20Godfrey.pdf?sequence=1&isAllowed=y

Compression Ratio Control of Free Piston Linear Generator with In-Cylinder Pressure Feedforward
https://www.jstor.org/stable/26559573?seq=1

A Review of the Design and Control of Free-Piston Linear Generator
https://www.researchgate.net/publication/327127242_A_Review_of_the_Design_and_Control_of_Free-Piston_Linear_Generator

Single-Cylinder Two-Stroke Free-Piston Internal Combustion Generator
https://arpa-e.energy.gov/sites/default/files/12_ARI%20PowerPoint%20template%20GENSETS_v4_public.pdf

Research on the engine combustion characteristics of a free-piston diesel engine linear generator
https://eprint.ncl.ac.uk/file_store/production/248513/AAAC05BE-1A3A-4007-A65C-437099838F0E.pdf

A Free-Piston Linear Generator Control Strategy for Improving Output Power
https://www.mdpi.com/1996-1073/11/1/135

Parametric Investigation of Combustion and Heat Transfer Characteristics of Oscillating Linear Engine Alternator
https://www.hindawi.com/journals/jc/2018/2907572/

Advanced combustion free-piston engines: A comprehensive review
https://journals.sagepub.com/doi/full/10.1177/1468087418800612

Reciprocating integral linear engine compressor
https://patents.google.com/patent/US9957958

Linear electrical machine/generator with segmented stator for free piston engine generator
https://patents.google.com/patent/US10072567

Engine
https://patents.google.com/patent/US10125674

Methods and systems for free piston engine control
https://patents.google.com/patent/US10132238

Control of piston trajectory in a free-piston combustion engine
https://patents.google.com/patent/US10156198

 

2017

Recent commercial free-piston engine developments for automotive applications
http://ocw.ump.edu.my/pluginfile.php/12827/mod_resource/content/1/Free-piston%20engine%20generator%20Design%20Patents%20review%20Open%20Access.pdf

Seminar Report on “Free Piston Linear Engine”
https://www.slideshare.net/skshivambat771/shivam-kushwah-free-piston-engine

A review on free piston linear engine (FPLE)
https://trid.trb.org/view/1625425

Friction characteristics of piston rings in a free-piston engine generator
https://trid.trb.org/view/1625425

Development and Application of Ring-Pack Model Integrating Global and Local Processes. Part 1
https://www.jstor.org/stable/26422580

The effect of power converter on the design of a Linear Alternator for use with a Joule Cycle-Free Piston Engine
https://ieeexplore.ieee.org/document/8002218

Research on a tubular flux-switching permanent-magnet linear machine
https://ieeexplore.ieee.org/document/8056541

Design of linear synchronous generator suitable for free-piston engine linear generator system
https://ieeexplore.ieee.org/document/8097243

Examination of a free-piston engine linear generator system with generation control for high efficiency
https://ieeexplore.ieee.org/document/8097246

Study of radial and axial magnets for linear alternator — Free piston engine system
https://ieeexplore.ieee.org/document/8107293

A novel stable control strategy of single cylinder free-piston linear generator
https://ieeexplore.ieee.org/document/8274843

Modeling and Control of a Portable Two-Stroke Free-Piston Engine Generator
https://ieeexplore.ieee.org/document/8484546

Methodologies for the Analytical Design of Tubular Linear Vernier Synchronous Generators with Quasi-Halbach-Magnetization
https://ieeexplore.ieee.org/document/8507177

A Linear Laminated Cylindrical Transverse Flux Machine for Use With a Free Piston Engine
https://ieeexplore.ieee.org/document/8509153

Development of an In-Cylinder Pressure Observer for Free-Piston Engines
https://ieeexplore.ieee.org/document/8511605

A Permanent Magnet Linear Electric Machine for the Free-Piston Linear Generator System: Design and Experimental Verification
https://ieeexplore.ieee.org/document/8549056

Examination of Miniaturization Using a Double Stator for a Free-Piston Engine Linear Generator System
https://ieeexplore.ieee.org/document/8549101

Simulation and Prototype Experiment Research of a Four Stroke Free Piston Engine
https://ieeexplore.ieee.org/document/8558955

Control of a Directly Driven Four-Stroke Free Piston Engine
https://ieeexplore.ieee.org/document/8592790

Electronic Ignition Based on In-Cylinder Pressure from a Pressure Sensor Glow Plug
https://ieeexplore.ieee.org/document/8624831

Investigation of Scavenging Process for Steady-State Operation of a Linear Internal Combustion Engine-Linear Generator Integrated System
https://www.sae.org/publications/technical-papers/content/2017-01-1087/

Free piston engine
https://patents.justia.com/patent/9995212

Engine
https://patents.google.com/patent/US9638100

Control of piston trajectory in a free-piston combustion engine
https://patents.google.com/patent/US9657675

Virtual variable displacement two-stroke internal combustion piston engine
https://patents.google.com/patent/US9664103

Existing state of art of free-piston engines
http://agronomy.emu.ee/wp-content/uploads/2017/05/Vol15SP1_Raide.pdf

Disturbance analysis of a free-piston engine generator using a validated fast-response numerical model
http://www.sciencedirect.com/science/article/pii/S0306261916314842

Free Piston Engine as Efficient as Fuel Cells
http://thekneeslider.com/free-piston-engine-as-efficient-as-fuel-cells/

Parametric study on the starting of a free-piston engine alternator
http://journals.sagepub.com/doi/abs/10.1177/1468087417712161

A Decoupled Design Parameter Analysis for Free-Piston Engine Generators
www.mdpi.com/1996-1073/10/4/486/pdf

Transient motion control for a free-piston engine
http://journals.sagepub.com/doi/abs/10.1177/0954407016684739

Trajectory-based combustion control for renewable fuels in free piston engines
https://experts.umn.edu/en/publications/trajectory-based-combustion-control-for-renewable-fuels-in-free-p

Free-Piston 4th Generation Engine Range Extender
https://www.irjet.net/archives/V4/i3/IRJET-V4I3632.pdf

VEHICLE HYBRID FREE-PISTON ENGINE-GENERATOR
http://tf.llu.lv/conference/proceedings2017/Papers/N020.pdf

Free-Piston Isolated-Scavenge for 2-Stroke Opposed-Piston Engine
https://contest.techbriefs.com/2017/entries/automotive-transportation/7917

Tribological characteristics of piston rings in a single-piston hydraulic free-piston engine
http://www.emeraldinsight.com/doi/abs/10.1108/ILT-01-2015-0011

A model-based control design approach for linear free-piston engines
http://sro.sussex.ac.uk/68140/

Theoretical Evaluation of the Maximum Work of Free-Piston Engine Generators
http://adsabs.harvard.edu/abs/2017JNET...42...31K

High-efficiency linear combustion engine   Etagen Inc.
http://www.google.com/patents/US9567898

 

2016

Sir Joseph Swan Centre for Energy Research at Newcastle University on a Free-Piston Engine range extender technology.
https://www.youtube.com/watch?v=u4b0_6byuFU

A fast response free-piston engine generator numerical model for control applications
http://econpapers.repec.org/article/eeeappene/v_3a162_3ay_3a2016_3ai_3ac_3ap_3a321-329.htm

Disturbance analysis of a free-piston engine generator using a validated fast-response numerical model
http://www.sciencedirect.com/science/article/pii/S0306261916314842

Study on breakdown voltage and minimum ignition energy of sparking system for free-piston linear generator
https://ieeexplore.ieee.org/document/7476375

Fault recovery control strategy of a two-stroke free-piston linear generator
https://ieeexplore.ieee.org/document/7476377

DC bus voltage control of a Free-Piston Linear Generator
https://ieeexplore.ieee.org/document/7476378

No-load Features of T-LSMs With Quasi-Halbach Magnets: Application to Free Piston Engines
https://ieeexplore.ieee.org/document/7549090

Coupling thermodynamics modeling and analysis of a free piston linear generator range-extender for HEVs
https://ieeexplore.ieee.org/document/7603618

Effects of initial temperature on the performances of free piston linear generator
https://ieeexplore.ieee.org/document/7603886

Optimization and comparison of linear transverse flux and flux switching machines.
https://ieeexplore.ieee.org/document/7732868

Design of tubular Moving Magnet Linear Alternator for use with an External Combustion - Free Piston Engine
https://ieeexplore.ieee.org/document/7739461

A comparison of alternative linear machines for use with a direct drive free piston engine
https://ieeexplore.ieee.org/document/7739516

Effect of Combustion Timing and Heat Loss on Spring-Assisted Linear Engine Translator Motion
http://papers.sae.org/2016-01-0560/

Investigation of Combustion Optimization Control Strategy for Stable Operation of Linear Internal Combustion Engine-Linear Generator Integrated System
https://www.sae.org/publications/technical-papers/content/2016-01-9144/

Development and Experimental Investigation of a Two-Stroke Opposed-Piston Free-Piston Engine
https://www.sae.org/publications/technical-papers/content/2016-32-0046/

High-efficiency linear combustion engine
https://patents.google.com/patent/US9567898

Internal combustion engine
https://patents.google.com/patent/US9353681

Free-piston engine control system ignition location optimization method based on extremum search
https://patents.google.com/patent/CN106089541A/en

Revolutionary Israeli Car Engine: 1 Cylinder, 1 Piston, 86 Horsepower, Double the Efficiency
http://www.jewishpress.com/news/revolutionary-israeli-car-engine-1-cylinder-1-piston-86-horsepower-double-the-efficiency/2016/01/24/
also
http://www.aquariusengines.com/
also
https://tallbloke.wordpress.com/2016/10/29/super-efficient-israeli-engine-bids-to-power-car-revolution/

Peugeot Investigating Innovative Range Extender Engine
http://gas2.org/2016/07/16/peugeot-investigating-innovative-range-extender-engine/

Free-piston Engine Range Extender Technology
https://www.youtube.com/watch?v=u4b0_6byuFU

Toyota developing free piston engine linear generator for hybrid cars Fox News
https://www.youtube.com/watch?v=iBwIMl917is

This startup is trying to reinvent the piston engine
https://www.youtube.com/watch?v=ZZZLPraJVd0

Israel firm wants super-efficient engine to power car revolution
https://phys.org/news/2016-10-israel-firm-super-efficient-power-car.html

Libertine: Free piston engine technology
https://www.youtube.com/watch?v=nDKjrumfspo

Introduction to Libertine's Linear Power Systems - CAD
https://www.youtube.com/watch?v=GC-i1Oerap0

PSA evaluating Aquarius Engines’ free-piston linear generator for range-extender
http://www.greencarcongress.com/2016/07/20160721-aquarius.html

Piston motion control of a free-piston engine generator: A new approach using cascade control
http://www.sciencedirect.com/science/article/pii/S0306261916310224

Free Piston Engine Linear Generator "FPEG"  Toyota
http://www.tytlabs.com/tech/fpeg/

Toyota R&D continues work on free piston linear generators for EVs; novel resonant pendulum control method
http://www.greencarcongress.com/2016/05/20160506-toyotafpeg.html

Toyota R&D team improves free piston linear generators
https://chargedevs.com/newswire/toyota-rd-team-improves-free-piston-linear-generators/

Development of Free Piston Engine Linear Generator System Part3 -Novel Control Method of Linear Generator for to Improve Efficiency and Stability Toyota
http://papers.sae.org/2016-01-0685/

Experimental Evaluation of a Prototype Free Piston Engine - Linear Alternator (FPLA) System
http://papers.sae.org/2016-01-0677/

Study on the Use of Springs in a Dual Free Piston Engine Alternator
http://papers.sae.org/2016-01-2233/

Resonance of a Spring Opposed Free Piston Engine Device
http://papers.sae.org/2016-01-0568/

Modeling and Simulation of a Free-Piston Engine with Electrical Generator Using HCCI Combustion
http://adsabs.harvard.edu/abs/2016PhDT........84A

Comparison between free piston and conventional internal combustion engine: A REVIEW
http://www.ijritcc.org/download/conferences/ICMTEST_2016/ICMTEST_2016_Track/1461905967_28-04-2016.pdf

Free Piston Engine Technology Video  SR Technology Innovations
http://www.sr-technology.eu/?p=88

TWO-STROKE DIRECT FUEL INJECT FREE PISTON GENERATOR FROM THEORY TO PRACTICE
http://www.arpnjournals.org/jeas/research_papers/rp_2016/jeas_1216_5416.pdf

A two stroke free piston engine’s performance and exhaust emission using artificial neural networks
https://link.springer.com/article/10.1007/s12206-016-0946-3

Free-Piston Linear Generator and the Development of a Solid Lubrication System
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2590043

Design and simulation of a two- or four-stroke free-piston engine generator for range extender applications
http://www.sciencedirect.com/science/article/pii/S0196890415011723

Modeling and Simulation of a Free-Piston Engine with Electrical Generator Using HCCI Combustion
http://adsabs.harvard.edu/abs/2016PhDT........84A

A fast response free-piston engine generator numerical model for control applications
http://econpapers.repec.org/article/eeeappene/v_3a162_3ay_3a2016_3ai_3ac_3ap_3a321-329.htm

Development and Experimental Investigation of a Two-Stroke Opposed-Piston Free-Piston Engine
http://elib.dlr.de/108927/1/__Stfkfs01_group_41314-AEW_04%20%C3%96ffentlichkeitsarbeit_Ver%C3%B6ffentlichungen_2016_SETC%20Paper%20HomfreeII%20mit%20FKFS_Paper%20%28downloaded%29_2016-32-0046.pdf

 

2015

Single-Cylinder Two-Stroke Free-Piston Internal Combustion Generator
https://arpa-e.energy.gov/technologies/projects/single-cylinder-two-stroke-free-piston-internal-combustion-generator

Approach to Electromagnetic Control of the Extreme Positions of a Piston in a Free Piston Generator
http://www.ccsenet.org/journal/index.php/mas/article/view/42887

Analysis and Optimization of a Dual Free Piston, Spring Assisted, Analysis and Optimization of a Dual Free Piston, Spring Assisted, Linear Engine Generator Linear Engine Generator
https://researchrepository.wvu.edu/cgi/viewcontent.cgi?article=7557&context=etd

Experimental Investigation and Analysis of Homogeneous Charge Compression Ignition in a Two-Stroke Free-Piston Engine
https://www.jstor.org/stable/26284819

Research on a Tubular Yokeless Linear PM Machine
https://ieeexplore.ieee.org/document/7115159

MEC-Based Modeling and Sizing of a Tubular Linear PM Synchronous Machine
https://ieeexplore.ieee.org/document/6990581

Analysis and optimization of a double-sided air-cored tubular generator
https://ieeexplore.ieee.org/document/7156825

Magnetic circuit analysis and performance improvement of a tubular staggered-tooth transverse-flux linear machine for free-piston energy converter
https://ieeexplore.ieee.org/document/7157479

Modeling and predictive control of Free Piston Engine Generator
https://ieeexplore.ieee.org/document/7172075

A control-oriented model for piston trajectory-based HCCI combustion
https://ieeexplore.ieee.org/document/7172077

Dynamic simulation of a novel free-piston linear generator
https://ieeexplore.ieee.org/document/7222779

Motion control of free piston engine generator based on LQR.
https://ieeexplore.ieee.org/document/7260927

Comparison of flux switching and modulated pole linear machines for use with a free piston.
https://ieeexplore.ieee.org/document/7409127

Design and analysis of a novel flux-modulated permanent magnet linear generator with sandwiched armature stator
https://ieeexplore.ieee.org/document/7453680

Libertine LPE free piston technology targeting power generation, waste-heat recovery and range-extended EV applications; feasibility study with PETRONAS
http://www.greencarcongress.com/2015/02/20150219-libertine.html

Free Piston Combustion Engine Design Analysis and Challenges
http://papers.sae.org/2015-32-0768/

Design and Simulation of Opposed-Piston Four-Stroke Free-Piston Linear Generator
https://saemobilus.sae.org/content/2015-01-1277/

Why ‘Free Piston’ engines could power your next plug-in hybrid
https://www.digitaltrends.com/cars/road-rave-free-piston-engines-power-next-plug-hybrid/amp/

Free-Piston Engines: A Possible Route to Hybrid-Electric Vehicles  Sandia Labs - DOE
http://crf.sandia.gov/free-piston-engines-a-possible-route-to-hybrid-electric-vehicles/

Semi-analytical modelling of a hydraulic free-piston engine
http://econpapers.repec.org/article/eeeappene/v_3a120_3ay_3a2014_3ai_3ac_3ap_3a75-84.htm

Precise piston trajectory control for a free piston engine
https://www.scopus.com/record/display.uri?eid=2-s2.0-84908669864&origin=inward&txGid=4a42b38d2c39da54ca3e5cc9ab283fc0

Design and Simulation of Opposed-Piston Four-Stroke Free-Piston Linear Generator
http://papers.sae.org/2015-01-1277/

Stable Operation and Electricity Generating Characteristics of a Single-Cylinder Free Piston Engine Linear Generator: Simulation and Experiments
http://www.mdpi.com/1996-1073/8/2/765

Modeling of piston trajectory-based HCCI combustion enabled by a free piston engine
http://econpapers.repec.org/article/eeeappene/v_3a139_3ay_3a2015_3ai_3ac_3ap_3a313-326.htm

Novel technology aims to enable free piston engine developmentLibertine
http://www.engineeringspecifier.com/around-the-industry/iot-sensors-set-to-drive-printed-electronics-gold-rush

Breakthrough in engine efficiency wins Cleantech Innovate 2015
http://www.cleantechinnovate.com/uncategorized/breakthrough-in-engine-efficiency-wins-cleantech-innovate-2015/

Parameters matching requirements for diesel free piston linear alternator start-up
http://www.researchgate.net/publication/274250936_Parameters_matching_requirements_for_diesel_free_piston_linear_alternator_start-up

The world’s first technology forum for linear power systems technology researchers and application developers  September 7, 2015
http://www.linearpower.org/

Toyota Central R&D developing free piston engine linear generator
http://otmur.com/toyota/toyota-central-rd-developing-free-piston-engine-linear-generator.html/

Development and validation of a free-piston engine generator numerical model (2015)
http://www.sciencedirect.com/science/article/pii/S0196890414010231

Toyota Ditches Crankshaft In Their New Free Piston Engine Linear Generator (FPEG)
http://wonderfulengineering.com/toyota-ditches-crankshaft-in-their-new-free-piston-engine-linear-generator-fpeg/

Investigation of Control Method for Starting of Linear Internal Combustion Engine-Linear Generator Integrated System
http://papers.sae.org/2015-01-1729/

Piston motion control of a free-piston engine generator: A new approach using cascade control FPEG
http://eprint.ncl.ac.uk/file_store/production/226997/71A47F25-8F1C-4462-9D3C-C92FC7437460.pdf

Recent commercial free-piston engine developments for automotive applications
https://www.researchgate.net/publication/278323339_Recent_commercial_free-piston_engine_developments_for_automotive_applications

A New Approach to Reduce Engine-Out Emissions Enabled by Trajectory-Based Combustion Control
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2481872

Linear free piston combustion engine with indirect work extraction via gas linkage  Etagen Inc.
http://www.google.com/patents/US8997699

Free-piston internal combustion engine
http://www.google.com/patents/US9032918

 

2014

Toyota develops high-efficiency ‘free piston’ no-crankshaft combustion engine… to power an EV
https://www.extremetech.com/extreme/185789-toyota-develops-high-efficiency-free-piston-no-crankshaft-combustion-engine-to-power-an-ev

Toyota developing free-piston engine linear generator for electric drive vehicles.
https://chargedevs.com/newswire/toyota-developing-free-piston-engine-linear-generator-for-electric-drive-vehicles/

Toyota Designs New Type Of Internal Combustion Engine For Extended-Range EVs
https://www.motorauthority.com/news/1091807_toyota-designs-new-type-of-internal-combustion-engine-for-extended-range-evs

Approach to Electromagnetic Control of the Extreme Positions of a Piston in a Free Piston Generator
https://www.semanticscholar.org/paper/Approach-to-Electromagnetic-Control-of-the-Extreme-Petrichenko-Tatarnikov/e1bc2f7ebae6c04e5654a8cb76a88c72dd74a125

Effect of Piston Motion on Combustion of CNG Free Piston Engine (FPE)
https://www.scientific.net/AMR.889-890.501

Exergy analysis of ideal thermodynamic cycle for the four stroke free piston engine (FPE)
https://www.thaiscience.info/Journals/Article/RIEJ/10968964.pdf

Experimental study and analysis on principle prototype of four-stroke free piston CNG engine
https://www.researchgate.net/publication/286832818_Experimental_study_and_analysis_on_principle_prototype_of_four-stroke_free_piston_CNG_engine

Thermodynamic Simulation and Prototype Testing of a Four-Stroke Free-Piston Engine
https://asmedigitalcollection.asme.org/gasturbinespower/article-abstract/136/5/051505/373595/Thermodynamic-Simulation-and-Prototype-Testing-of

Investigation of the starting process of free-piston engine generator by mechanical resonance
https://www.sciencedirect.com/science/article/pii/S1876610214030033

Constraint enforcement of piston motion in a free-piston engine
https://ieeexplore.ieee.org/document/6858892

Design and analysis of a permanent magnet linear generator for a free-piston energy converter
https://ieeexplore.ieee.org/document/6931445

Dynamic model of a free piston tubular linear generator for vehicle auxiliary power supply
https://ieeexplore.ieee.org/document/7056114

No crankshaft, no problem: Toyota's free piston engine is brilliant
http://www.roadandtrack.com/go/out-of-turn-toyota-engine

Youtube Toyota developing free piston engine linear generator for hybrid cars Fox News
http://www.youtube.com/watch?v=iBwIMl917is

Recent Commercial Free-Piston Engine Developments for Automotive Applications
http://umpir.ump.edu.my/7031/

Fundamental Analysis of Spring-Varied, Free Piston, Otto Engine Device
http://papers.sae.org/2014-01-1099/

Optimal motion trajectory for the four-stroke free-piston engine with irreversible Miller cycle via a Gauss pseudospectral method
http://www.degruyter.com/view/j/jnet.2014.39.issue-3/jnet-2014-0003/jnet-2014-0003.xml

Free-Piston Engines: A Possible Route to Hybrid-Electric Vehicles
http://crf.sandia.gov/free-piston-engines-a-possible-route-to-hybrid-electric-vehicles/

The Effect of Cylinder Clearance on Output Work of ORC-FP used in Waste Energy Recovery
http://papers.sae.org/2014-01-2563/

Fundamental Explorations of Spring-Varied, Free Piston Linear Engine Devices
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2022933

Precise piston trajectory control for a free piston engine
http://www.sciencedirect.com/science/article/pii/S0967066114002354

Tribological Characteristics of Piston Ring in a Free-piston Engine for Linear Generator
http://www.sciencedirect.com/science/article/pii/S1876610214028380

Design of future concepts and variants of The Free Piston Linear Generator - Toyota
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6844029&sortType%3Dasc_p_Sequence%26filter%3DAND(p_IS_Number%3A6843992)

Green Car Congress 2014 Toyota Central R&D developing free-piston engine linear generator; envisioning multi-FPEG units for electric drive vehicles
http://www.greencarcongress.com/2014/04/20140422-fpeg.html

TURBINE-COMPOUND FREE-PISTON LINEAR ALTERNATOR ENGINE
http://deepblue.lib.umich.edu/bitstream/handle/2027.42/107140/brandlee_1.pdf?sequence=1&isAllowed=y

Optimal motion trajectory for the four-stroke free-piston engine with irreversible Miller cycle via a Gauss pseudospectral method
http://www.degruyter.com/view/j/jnet.2014.39.issue-3/jnet-2014-0003/jnet-2014-0003.xml?format=INT

Simulation Study of SI-HCCI Transition in a Two-Stroke Free Piston Engine Fuelled with Propane
http://papers.sae.org/2014-01-1104/

Development of Free Piston Engine Linear Generator System Part 1 - Investigation of Fundamental Characteristics
http://papers.sae.org/2014-01-1203/

Development of Free Piston Engine Linear Generator System Part 2 - Investigation of Control System for Generator
http://papers.sae.org/2014-01-1193/

Overcoming Pressure Waves to Achieve High Load HCCI Combustion
http://papers.sae.org/2014-01-1269/

Fundamental Analysis of Spring-Varied, Free Piston, Otto Engine Device
http://papers.sae.org/2014-01-1099/

Free piston engine – Libertine
http://www.google.com/patents/US8794198

Free piston linear alternator utilizing opposed pistons with spring return - GM
http://www.google.com/patents/US8714117

Opposed-piston cylinder bore constructions with solid lubrication in the top ring reversal zones – Achates Power
http://www.google.com/patents/US8851029

Methods and systems for managing a clearance gap in a piston engine - Etagen
http://www.google.com/patents/US8770090

Methods and systems for managing a clearance gap in a piston engine - Etagen
http://www.google.com/patents/US8720317

Piston engine having magnetic piston bearing - Siemens Aktiengesellschaft
http://www.google.com/patents/CA2772845C?cl=en

Opposed piston internal combustion engine and method of operation thereof
http://www.google.com/patents/US8671681

High-efficiency linear combustion engine - Etagen, Inc.
http://www.google.com/patents/US8662029

Methods and systems for managing a clearance gap in a piston engine - Etagen, Inc.
http://www.google.com/patents/US8656895

2013

Free Piston Electric Power Generator Set & Combustion Research

Opposed free piston linear alternator  GM
http://www.google.com/patents/US8616162

High-efficiency linear combustion engine   Etagen, Inc.
http://www.google.com/patents/US8402931

Free-piston IC generator developed for range-extender hybrids
http://articles.sae.org/12284/

TIME FOR A RETHINK  A free-piston IC generator has been developed for range-extended hybrids. 
Steven Ashley looks at the implications.  SAE Magazine November/December 2013
http://www.sae.org/magazines/pdf/AUTODES1213.pdf

Influence of Pressure Build-Up Time of Compression Chamber on Improving the Operation Frequency of a Single-Piston Hydraulic Free-Piston Engine
http://bit.ly/1t4cO8b

Development Approach for the Investigation of Homogeneous Charge Compression Ignition in a Free-Piston Engine
http://papers.sae.org/2013-24-0047/

Free piston linear generator in comparison to other range-extender technologies
http://elib.dlr.de/87403/1/EVS%2027_DLR_Virsik_Heron_FPLG.pdf

MAGNETIC FIELD OF TUBULAR LINEAR MACHINES WITH DUAL HALBACH ARRAY
http://www.jpier.org/PIER/pier136/18.12110302.pdf

Dynamics and Control of a Free-Piston Diesel Engine
http://bit.ly/1t4cQgr

U of M student project to create a renewable fuel engine wins $10,000 prize in Dow SISCA Challenge
http://www1.umn.edu/news/news-releases/2013/UR_CONTENT_464971.html

Opposed free piston linear alternator - GM
http://www.google.com/patents/US8616162

Free piston assembly and method for controlling a free piston assembly - Umc Universal Motor Corp
http://www.google.com/patents/US8601988

Opposed free piston linear alternator - GM
http://www.google.com/patents/US8616162

Linear generator having a fluid pressure cylinder structure
http://www.google.com/patents/US8610320

Free piston assembly and method for controlling a free piston assembly - Umc Universal Motor Corporation Gmbh
http://www.google.com/patents/US8601988

Free piston linear generator FKLG - youtube
http://www.youtube.com/watch?v=_pBPw33ceoQ

Car Engine of the Future – New Internal Combustion Engine to boost Electric Cars Range, Efficiency
http://www.youtube.com/watch?v=yV09wMXTSIc

High efficiency small power generation - Video Presentation
http://www.cleantechinnovate.com/dt_portfolio/libertine-fpe-ltd/

New internal combustion engine could boost electric cars - News
http://www.foxnews.com/leisure/2013/03/13/new-internal-combustion-engine-could-boost-electric-cars/

SAE Automotive Engineering online Magazine
http://www.sae.org/mags/aei/12284/

DLR-free-piston-linear-generator-range-extender - Magazine
http://www.gizmag.com/dlr-free-piston-linear-generator-range-extender/27736/

Germans create ‘free-piston’ multi-fuel engine that could answer EV range
DLR team develops demonstrator of free-piston linear generator as range extender for EVs; technology
transfer to Universal Motor Corp
http://www.greencarcongress.com/2013/02/dlr-20120220.html
and
http://www.freikolben.ch/37401/109964.html

Development of an opposed free-piston linear generator according to the Pescara principle
http://www.freikolben.ch/37401/235512.html

Freikolbenmotoren / Free Piston Engines
http://www.freikolben.ch/9301.html

Sandia Labs Free-Piston Engine Project 2013
http://www4.eere.energy.gov/vehiclesandfuels/resources/merit-review/sites/default/files/ace008_johnson_2013_o.pdf

The Chiron free piston electric generator
http://www.innas.com/Chiron_FPG.html

Linear Combustion Engine project at the Czech technical university
http://www.lceproject.org/en/index.php

Development Approach for the Investigation of Homogeneous Charge Compression Ignition in a Free-Piston Engine
http://papers.sae.org/2013-01-2653/

A highly efficient energy converter for a hybrid vehicle concept - focused on the linear generator of the next generation
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6521533&queryText%3DFree-piston+Generator

A high efficient energy converter with flex fuel potential
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6586916&queryText%3DFree-piston+Generator

A transverse flux permanent magnet linear generator for hybrid electric vehicles
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6563717&pageNumber%3D2%26queryText%3DFree-piston+Generator

The Free Piston Linear Generator - Development of an Innovative, Compact, Highly Efficient Range-Extender Module - DLR
http://papers.sae.org/2013-01-1727/

Design and Operational Characteristics of a Novel Floating-Stroke, Free Piston Internal Combustion Reciprocating Engine – Energy Transition Technology
http://papers.sae.org/2013-01-0284/

Effect of Injection Timing on the Operation of Hydrogen-Fuelled Free-Piston Linear Generator Engine during  starting
http://tech.jsae.or.jp/ijae/detail.aspx?pno=20134102

An Investigation into the Operating Characteristics of a Free Piston Linear Engine Using Numerical Analysis]- SAE
http://www.bookpark.ne.jp/cm/jsae/search_e.asp

Investigation of Starting Behaviour of a Free-piston Linear Generator
http://scialert.net/fulltext/?doi=jas.2012.2592.2597

Zero constraint free piston energy converter
http://www.lboro.ac.uk/departments/aae/research/groups/low-carbon-technology/project-piston-energy.html

Free piston engine considerations: concepts, cycles, combustion variability, aalternator configurations, regulation of piston movement, 
http://www.unitec.ac.nz/jmctest/free_piston_linear_alternators/?author=1

Modelling and Control of Linear Combustion Engine LCE
http://www.slideserve.com/jasmine/modelling-and-control-of-linear-combustion-engine-lce

Fuel combustion under asymmetric piston motion-Tested results
http://www.academia.edu/4083680/Fuel_combustion_under_asymmetric_piston_motion_Tested_results

Free Piston Engine Development - Unitec
http://www.unitec.ac.nz/jmctest/free_piston_linear_alternators/?author=2

High-efficiency linear combustion engine - EtaGen
http://www.google.com/patents/US8453612

High-efficiency two-piston linear combustion engine - EtaGen
http://www.google.com/patents/US8413617

High-efficiency linear combustion engine - EtaGen
http://www.google.com/patents/US8402931

Modular Auxiliary Power Unit Assembly For An Electric Vehicle - GE
http://www.google.com/patents/US8376070

Engine device
http://www.google.com/patents/US8485146

 

 2012

Development of a Free-Piston Linear Generator for use in an Extended-Range Electric Vehicle
http://elib.dlr.de/80777/1/EVS_26_Ferrari.pdf

West Virginia University Linear Engine Development
http://energy.gov/sites/prod/files/2014/03/f8/p-06_covington.pdf

Numerical and Experimental Investigation of In-Cylinder Flow in a Loop-Scavenged Two-Stroke Free Piston Engine
http://papers.sae.org/2012-32-0114/

Free Piston Four Stroke Linear Engine With Generator - youtube
http://www.youtube.com/watch?v=2SlwoBLspTQ

Greencarcongress.com 2012
http://www.greencarcongress.com/2012/11/fpla-20121125.html

Novel opposed-piston free-piston linear generator for hybrids seeks to overcome drawbacks of earlier designs
http://www.greencarcongress.com/2012/06/huang-20120606.html

FREE-PISTON ENGINE - DOE Sandia National Laboratories . Tuesday, May 15, 2012 . Project ID: ACE008
http://freepdfdb.org/pdf/free-piston-engine-energygov-department-of-energy-34355929.html

Free piston internal combustion engine
http://www.ncl.ac.uk/business/commercialisation/transfer/engineering/free-piston-internal-combustion-engine.htm

Free-CHP: free-Piston Reciprocating Joule Cycle Engine
http://research.ncl.ac.uk/pro-tem/components/pdfs/ICAE2012/Newcastle_RMikalsen.pdf

Numerical and Experimental Investigation of In-Cylinder Flow in a Loop-Scavenged Two-Stroke Free Piston
Engine - DLR
http://papers.sae.org/2012-32-0114/

A Study for Generating Power on Operating Parameters of Powerpack Utilizing Linear Engine
http://papers.sae.org/2012-32-0061/

The Effects of Spark Timing and Equivalence Ratio on Spark-Ignition Linear Engine Operation with Liquefied Petroleum Gas
http://papers.sae.org/2012-01-0424/

An Opposed-Piston Free-Piston Linear Generator Development for HEV
http://papers.sae.org/2012-01-1021/

Use of 2D and 3D finite elements in the design of novel transverse flux machines
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6387468

Design optimisation of a transverse flux, short stroke, linear generator
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6349937&pageNumber%3D2%26queryText%3DFree-piston+Generator

Oscillating generator for hybrid-electrical and electrical vehicles
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6350155&pageNumber%3D2%26queryText%3DFree-piston+Generator

Performance comparison of saturated tubular linear permanent magnet generators by simplified FEAs
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6477463&pageNumber%3D2%26queryText%3DFree-piston+Generator

Effect of injection timing of hydrogen-fuelled free-piston linear generator engine during starting JSAE 20134102
http://tech.jsae.or.jp/ijae/download_pdf.aspx?pno=20134102

Linear Permanent Magnet Electric Generator for Free Piston Engine Applications
http://users.utcluj.ro/~szabol/Papers/ICEM2012_2.pdf

Development of a Free-Piston Linear Generator for use in an Extended-Range Electric Vehicle
http://elib.dlr.de/80777/1/EVS_26_Ferrari.pdf

Effect of Compression Ratio and Applied Voltage on Free-Piston Linear Generator Engine
http://www.waset.org/journals/ijeps/v6/v6-73.pdf

Study on Piston Motion Control Strategy of Single Piston Hydraulic Free-piston Engine
http://bit.ly/1fB8AiW

Dimensionless Parametric Analysis of Spark Ignited Free-Piston Linear Alternator
http://bit.ly/19hHfsR

Simulation Of A Two–Stroke Spark Ignition Free Piston Linear Engine Motion
http://bit.ly/1bUh1nb

Permanent Magnetic Model Design and Characteristic Analysis of the Short-stroke Free Piston Alternator
http://papers.sae.org/2012-01-1610/

Liquid Fuel Vaporization Process Built Inside 2-Stroke Piston Engines
http://papers.sae.org/2012-36-0122/

Hybrid powertrain system using free piston linear alternator engines - GM
http://www.google.com/patents/US8261860

OPPOSED FREE PISTON LINEAR ALTERNATOR - GM
http://www.google.com/patents/US20120112468

Free-piston linear alternator systems and methods - GM
ttp://www.google.com/patents/US8324745

Method to convert free-piston linear motion to rotary motion
http://www.google.com/patents/US8151744

Free Piston Engine – Libertine
http://www.google.com/patents/US20120280513

Piston – Libertine
http://www.google.com/patents/US20120255434

Combustion Management System – Libertine
http://www.google.com/patents/US20120266842

Paired-piston linear engine
http://www.google.com/patents/US8091519

Free piston engine generator – Libertine FPE
http://www.google.com/patents/WO2012080709A1?cl=en

 

2011

HiPerTEC: Toroidal, Opposed, Free Piston Engine (HT3) - youtube
http://www.youtube.com/watch?v=ARaYBPd898A&feature=endscreen&NR=1

The Operation of Free Piston Linear Generator Engine Using MOSFET and IGBT Drivers
http://scialert.net/fulltext/?doi=jas.2011.1791.1796&org=11

One-dimensional simulation of two stroke hydrogen direct injection linear generator free-piston engine
http://umpir.ump.edu.my/1714/1/Muhammad_Alliff_Rahim_(_CD_5128_).pdf

End effects in linear tubular motors and compensated position sensorless control based on pulsating voltage injection
http://core.kmi.open.ac.uk/download/pdf/11413853.pdf

A Comparative Study of Permanent Magnet Linear Alternator and Hydraulic Free Piston Engines
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1638333

A Novel Approach to Free-Piston Engine Control Using an FPGA Based Control System
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1627388

A Comparative Study of Permanent Magnet Linear Alternator and Hydraulic Free-Piston Engines
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1638333

2011 DOE Vehicle Technologies Program Annual Merit Review May 10, 2011
http://www1.eere.energy.gov/vehiclesandfuels/pdfs/merit_review_2011/adv_combustion/ace008_vanblarigan_2011_o.pdf

Numerical analysis of two-stroke free piston engine operating on HCCI combustion
http://journals.ohiolink.edu/ejc/pdf.cgi/Xu_Shuaiqing.pdf?issn=03062619&issue=v88i0011&article=3712_naotfpeoohc

Compression Ignition Linear Engine Design Variable Effects
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1627441

Design of a 5 kW Tubular Permanent Magnet Linear Alternator
http://bit.ly/199YGRP

Research on a novel tubular transverse-flux permanent-magnet linear machine for free-piston energy converter
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6073432

Dynamic modeling of SI/HCCI free-piston engine generators
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=5975849&queryText%3DFree-piston+Generator

Engine Terminology and Nomenclature-General
SAE Recommended Practice is applicable to all types of reciprocating engines including two-stroke cycle and free piston engines
http://standards.sae.org/j604_201108/

Opposed-piston-two-stroke-diesel-engine-a-renaissance
http://freepdfdb.org/pdf/opposed-piston-two-stroke-diesel-engine-a-renaissance-7682641.html

Research on the Magnetic Characteristic of a Novel Transverse-Flux PM Linear Machine Used for Free-Piston Energy Converter
http://bit.ly/14VSWI1

Dimensionless Parametric Analysis of Spark Ignited Free-Piston Linear Alternator
http://bit.ly/15EfxWO

FREE-PISTON INTERNAL COMBUSTION ENGINE
http://bit.ly/15EfrOZ

Free Piston Engine - Libertine
http://www.google.com/patents/US20120280513?cl=en

A piston – Libertine FPE
https://www.google.com/patents/US20120255434?cl=en

Control method for a free-piston engine using a prediction curve and a free-piston engine controlled thereby -  Enginetech
http://www.google.com/patents/WO2011068258A1?cl=en

Combustion management system – Libertine FPE
http://www.google.com/patents/WO2011077162A1?cl=en

Free piston electromagnetic engine – Invention Science Fund
http://www.google.com/patents/US8037852

Linear power generator with a reciprocating piston configuration
http://www.google.com/patents/US20110221206

 

2010

 

linear combustion engine.flv - youtube
http://www.youtube.com/watch?NR=1&v=B93n8sNsRpU&feature=endscreen

Stelzer Free Piston Engine - youtube
http://www.youtube.com/watch?v=YR5PGGKS4ys

Linear Combustion Engine - Honda
http://www.my-hondacars.com/honda-video/civic-2013/linear-combustion-engineflv-V-B93n8sNsRpU.htm

Free-piston internal combustion engine for hybrid drive device of motor vehicle, has electric linear drive and piston device with piston and rotor device - BOSCH GMBH
http://worldwide.espacenet.com/publicationDetails/biblio?CC=DE&NR=102008042169A1&KC=A1&FT=D

Simulations of Key Design Parameters and Performance Optimization for a Free-piston Engine
http://papers.sae.org/2010-01-1105/

The-control-of-a-free-piston-engine-generator-part-1- fundamental analyses
http://www.mikalsen.eu/papers/FPEcontrol1.pdf

The-control-of-a-free-piston-engine-generator-part-2-engine dynamics and piston motion control
http://www.mikalsen.eu/papers/FPEcontrol2.pdf

Parametric study of a free piston linear alternator
http://link.springer.com/article/10.1007%2Fs12239-010-0015-3

Predictive piston motion control in a free-piston internal combustion engine
http://www.sciencedirect.com/science/article/pii/S0306261909004784

Prototype testing and analysis of a novel internal combustion linear generator integrated power system
http://econpapers.repec.org/article/eeeappene/v_3a87_3ay_3a2010_3ai_3a4_3ap_3a1342-1348.htm

A Linear Magnetic-geared Free-piston Generator for Range-extended Electric Vehicles
http://union-services.com/aevs/1345-1349.pdf

Design and analysis of a novel linear transverse flux permanent magnet motor using HTS magnetic shielding
http://hub.hku.hk/bitstream/10722/129184/1/Content.pdf

Modeling of a Two-Stroke Free-Piston Engine With HCCI Combustion
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1613343

Design Optimization of Transverse Flux Linear Motor for Weight Reduction and Performance Improvement
 Using Response Surface Methodology and Genetic Algorithms
http://bit.ly/16CvUcw

Experimental Study on Hydraulic Free Piston Diesel Engine
http://papers.sae.org/2010-01-2149/

Improved Moving Coil Electric Machine for Internal Combustion Linear Generator
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5409649

Design of a linear magnetic-geared free-piston generator for series hybrid electric vehicles
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5729021&url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber%3D5729021

Research on the electromagnetic structure and performance of a novel transverse-flux PM linear machine used for free-piston energy converter
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5481293

Free piston tubular permanent-magnet linear generator based on electromagnetic field analysis
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=5535633&queryText%3DFree-piston+Generator

Calculation of a linear generator for a hybrid vehicle concept
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=5607780&queryText%3DFree-piston+Generator

Modeling and simulation of a moving-coil linear generator
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=5716156&pageNumber%3D2%26queryText%3DFree-piston+Generator

Energy Converter - Volvo Car Corporation
http://www.google.com/patents/US7845317

Free piston electromagnetic engine – The Invention Fund
http://www.google.com/patents/US7777357

Method and system for controlling a free-piston energy converter - Volvo
http://www.google.com/patents/US7721686

Linear generator
http://www.google.com/patents/US20100277012

Free-piston engine having variable stroke and method for operating a free-piston engine – UMC Universal Motor Corp
http://www.google.com/patents/WO2010046120A1?cl=en

Free piston assembly and method for controlling a free piston assembly - UMC Universal Motor Corp
http://www.google.com/patents/US20100162998

Deformable chamber-based homogeneous charge combustion ignition (HCCI) engine and generator
http://www.google.com/patents/US7775184

Free piston device with electrically driven linear actuator
http://www.google.com/patents/EP1398863B1?cl=en

 

2009

 

Video – Galileo Prototype –2
http://www.galileo-fpe.com/assets/multimedia/galileo-fpe.wmv

DOE Sandia Labs Technical Paper FREE PISTON GEN SET
http://www1.eere.energy.gov/vehiclesandfuels/pdfs/merit_review_2009/advanced_combustion/ace_08_vanblarigan.pdf

The design and simulation of a two-stroke free-piston compression ignition engine for electrical power generation - Innas
http://www.mikalsen.eu/papers/FPEsimulation.pdf

The performance characteristics of a hydrogen-fuelled free piston internal combustion engine and linear generator system
http://ijlct.oxfordjournals.org/content/4/1/36.abstract

Performance simulation of a spark ignited free-piston engine generator
http://www.mikalsen.eu/papers/FPEsparkIgnition.pdf

Coupled dynamic–multidimensional modelling of free-piston engine combustion.
http://www.mikalsen.eu/papers/FPEcoupledSolver.pdf

Modeling and Experimental Characterization of a Permanent Magnet Linear Alternator for Free-Piston Engine Applications – Sandia Labs
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1647880

A review of free-piston engine history and applications.
http://www.mikalsen.eu/papers/FPEreview.pdf

Coupled dynamic–multidimensional modeling of free-piston engine Combustion
http://www.mikalsen.eu/papers/FPEcoupledSolver.pdf

Advanced Combustion/Modeling and Analysis Toward HCCI/PCCI in a 60% Efficient Free-Piston Engine – DOE
http://www1.eere.energy.gov/vehiclesandfuels/pdfs/deer_2009/poster1/deer09_fitzgerald.pdf

Modeling and Control of a High Pressure Combined Air/Fuel Injection System
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1648355

MODELING OF TWO STROKE, DUAL CYLINDER FREE PISTON LINEAR GENERATOR ENGINE
http://www.thedigilib.com/doc/247874-modeling-of-two-stroke-dual-cylinder-free-piston-linear-generator-engine

Investigation of linear generator starting modes by mechanical resonance and rectangular current commutation
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=5075241&queryText%3DFree-piston+Generator

A computational study of free-piston diesel engine combustion
http://www.mikalsen.eu/papers/FPEdieselCFD.pdf

Dynamic and thermodynamic analysis of two-stroke, dual cylinder, linear combustion engine
http://eprints.utp.edu.my/4926/

Energy Converter Having Pistons With Internal Gas Passages
http://www.google.com/patents/US20090308345

Power generating system - Aerodyne Research
http://www.google.com/patents/US7485977

Hybrid drive
http://www.google.com/patents/US20090107744

 

2008

Free Piston Electric Power Generator Set & Combustion Research

Free Piston Engine as Efficient as Fuel Cells
http://thekneeslider.com/free-piston-engine-as-efficient-as-fuel-cells/

YOUTUBE VIDEO OF The Linear Combustion Engine
http://www.youtube.com/watch?v=pX3oAjnYZgc

High-Efficiency Generators for Hybrid Vehicles - Magazine
http://www.technologyreview.com/news/410914/high-efficiency-generators-for-hybrid-vehicles/?nlid=1374

DOE FREE PISTON GEN SET - DOE - SANDIA LABS
http://www.cleanmpg.com/forums/printthread.php?t=16278

FREE PISTON GEN SET FP3
http://www.freepistonpower.com/

Modeling a Free-Piston Engine Genset for Hybrid Applications 
http://www.greencarcongress.com/2008/09/modeling-a-free.html

FY 2008 DOE Vehicle Technologies Office Annual Merit Review
http://www1.eere.energy.gov/vehiclesandfuels/resources/proceedings/2008_merit_review.html

Modeling and Simulation of a Hydraulic Free Piston Diesel Engine
http://papers.sae.org/2008-01-1528/

Simulation of a Two-Stroke Free-Piston Engine for Electrical Power Generation
http://pubs.acs.org/doi/pdf/10.1021/ef800217k

SIMULATION OF FOUR STROKE FREE PISTON DIESEL ENGINE
http://umpir.ump.edu.my/1048/1/Hafnizar_Muhamad_Shaharuddin.pdf

The fuel efficiency and exhaust gas emissions of a low heat rejection free-piston diesel engine
http://eprint.ncl.ac.uk/%2Ffile_store%2Fproduction%2F148460%2F35A33F52-1EF2-4F55-AACD-88EDA5330047.pdf

The design and simulation of a two-stroke free-piston compression ignition engine for electrical power generation
http://www.mikalsen.eu/papers/FPEsimulation.pdf

A New Type of Fuel Cell, Free Piston Engines
http://galileo-fpe.com/assets/documents/A-New-Type-of-Fuel-Cell-%20Free%20Piston-Engines-by-KG.pdf

CFD-Based Optimization of a Diesel-fueled Free Piston Engine Prototype for Conventional and HCCI Combustion
http://papers.sae.org/2008-01-2423/

MINIATURE INTERNAL COMBUSTION ENGINE-GENERATOR FOR HIGH ENERGY DENSITY PORTABLE POWER
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA504220

3D analyses of a novel Transverse Flux machine for a free piston energy converter
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4799878

Rectangular current commutation and open-loop control for starting of a free-piston linear engine-generator
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=4762637&queryText%3DFree-piston+Generator

Direct power control of a permanent magnet linear generator in a free piston energy converter
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=4771406&queryText%3DFree-piston+Generator

Starting of a free-piston linear engine-generator by mechanical resonance and rectangular current commutation
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=4677748&queryText%3DFree-piston+Generator

DIESEL FREE PISTON GEN SET STUDY Simulation of In-cylinder Processes in a
Free Piston Engine
http://bit.ly/1bjsXfn

The design and simulation of a two-stroke free-piston compression ignition engine for electrical power generation
http://www.mikalsen.eu/papers/FPEsimulation.pdf

Performance simulation of a spark ignited free-piston engine generator.
http://www.mikalsen.eu/papers/FPEsparkIgnition.pdf

SIMULATION OF FOUR STROKE FREE PISTON DIESEL ENGINE
http://umpir.ump.edu.my/1048/1/Hafnizar_Muhamad_Shaharuddin.pdf

Simulation of a Two-Stroke Free-Piston Engine for Electrical Power Generation
http://pubs.acs.org/doi/full/10.1021/ef800217k

Zero constraint free piston energy converter
http://www.lboro.ac.uk/departments/aae/research/groups/low-carbon-technology/project-piston-energy.html

Flat-type permanent magnet linear alternator: A suitable device for a free piston linear alternator
http://link.springer.com/article/10.1631%2Fjzus.A0820224

Starting Mode Analysis of Flat-type Linear Generator for Free-Piston Engine
http://www.koreascience.or.kr/article/ArticleFullRecord.jsp?cn=DHJGII_2008_v57n6_966

Engine System Having Improved Efficiency - Ford
http://www.google.com/patents/US7426910

Internal combustion engine – Advanced Propulsion Technologies
https://www.google.com/patents/US7383796

System and method for controlling a power generating system – Aerodyne Research
https://www.google.com/patents/US7332825

Free piston engine with linear power generator system
http://www.google.com/patents/US7318506

Four-Stroke Free Piston Engine
http://www.google.com/patents/US20080271711

 

2007

 

Investigation of a high efficient Free Piston Linear Generator with variable Stroke and variable Compression Ratio  A new Approach for Free Piston Engines
http://elib.dlr.de/49457/1/FKLG_-_WEVA_2007_Volume_1.pdf?origin=publication_detail

Linear Combustion engine as main energy unit for hybrid vehicles
http://www3.fs.cvut.cz/web/fileadmin/documents/12241-BOZEK/publikace/2007/2007_078_01.pdf

Analysis of Tubular-type Linear Generator for Free-Piston Engine
http://www.icrepq.com/icrepq07/365-Sun-Ki%20Hong.pdf

Structural Design and Porting Parameters Calculation of a Micro Piston Engine for Power Generation
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1592225

Research on a Tubular Longitudinal Flux PM Linear Generator Used for Free-Piston Energy Converter
http://bit.ly/1676ph1

Introducing Hydraulic-Electric Synergy into Hybrid Transmission Using the Free-piston Engine Technology
http://papers.sae.org/2007-01-4112/

Numerically Modeling the Dynamics of a Piston-Mounted Passive Inlet Poppet Valve
http://papers.sae.org/2007-32-0099/

Dynamic Simulation of the Transverse Flux Machine using Linear Model and Finite Element Method
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4460058

Design and Experimental Verification of a Linear Permanent Magnet Generator for a Free-Piston Energy Converter
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=4207479&queryText%3DFree-piston+Generator

Starting mode analysis of tubular-type linear generator for free-piston engine with dynamic characteristics
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=4412221&queryText%3DFree-piston+Generator

Control device for free piston engine and method for the same – Denso Corp
http://www.google.com/patents/US7258085

Internal combustion engine – Advanced Propulsion Technologies
http://www.google.com/patents/US7207299

Internal combustion engine – Advanced Propulsion Technologies
https://www.google.com/patents/US7255070

Linear-electrical-machine-for-electric-power-generation-or-motive-drive – TIAX LLC
 http://www.google.com/patents/US20070108850

Four-cylinder, four-cycle, free piston, premixed charge compression ignition, internal combustion reciprocating piston engine with a variable piston stroke
http://www.google.com/patents/US7258086

 

2006

 

Modeling a Two-Stroke, Free-Piston HCCI-Like Engine for Hybrid Applications
2006 SAE GREEN CAR CONGRESS
http://www.greencarcongress.com/2006/11/modeling_a_twos.html

Performance of a Series Hybrid Electric Vehicle with a Free-Piston Energy Converter
http://www.ee.kth.se/php/modules/publications/reports/2006/IR-EE-EME_2006_003.pdf

Linear Engine Coupled Linear Generator Starting For Hybrid Electric Vehicle Applications
http://www.icee-con.org/papers/2006/pdf/MI1-04.pdf

Analysis and control of a hybrid vehicle powered by free-piston energy converter
http://kth.diva-portal.org/smash/get/diva2:11141/FULLTEXT01.pdf

Modeling the Effect of Injection Schedule Change on Free Piston Engine Operation
http://papers.sae.org/2006-01-0449/

CONTROL OF TWO-STROKE FREE-PISTON GENERATOR
http://www3.fs.cvut.cz/web/fileadmin/documents/12241-BOZEK/publikace/2007/2007_076_01.pdf

Modeling of a Free Piston Energy Converter
http://publications.lib.chalmers.se/cpl/record/index.xsql?pubid=22421

Reciprocating flux-concentrated induction generator for free-piston generator
http://bit.ly/1bjuKRs

A Unique Starting Scheme of Linear-Engine Tubular PM Linear Generator System Using Position Feedback Controlled PWM Inverter
http://bit.ly/15Do7KS

Detent Force Reduction of a Tubular Linear Generator Using an Axial Stepped Permanent Magnet Structure
http://bit.ly/16Wz9px

In-cycle thermodynamic model of linear combustion engine
http://bit.ly/15EgluO

SIMULATION OF A TWO-STROKE SPARK IGNITION FREE PISTON LINEAR ENGINE MOTION
http://www.jurnalteknologi.utm.my/index.php/jurnalteknologi/article/view/352/342

DURABILITY ASSESMENT OF A NEW FREE PISTON SPARK IGNITION LINEAR ENGINE:  A COMPUTATIONAL APPROACH
http://www.jurnalteknologi.utm.my/index.php/jurnalteknologi/article/view/318/308

Simulation of Linear Induction Generators in Hybrid Electric Vehicle Applications
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=4123564&queryText%3DFree-piston+Generator

Free-piston generator
http://worldwide.espacenet.com/publicationDetails/biblio?CC=CN&NR=1978877A&KC=A&FT=D

Apparatus for determining free piston position and an apparatus for controlling free piston position – Global Cooling
http://www.google.com/patents/US7075292

Starting a compression ignition free piston internal combustion engine having multiple cylinders  - Ford
http://www.google.com/patents/US6983724

Free-piston device with electric linear drive – Deutsches Zentrum fur Luft
http://www.google.com/patents/US7082909

Two-stroke internal combustion engine with free opposed pistons - FEV
http://www.google.com/patents/US7047916

Method for regulating the operation of a device for generating electric energy by means of a generator driven by a free-piston internal combustion engine - FEV
http://www.google.com/patents/US7116004

Free-piston device with electric linear drive - Deutsches Zentrum fur Luft
http://www.google.com/patents/US7082909

Valve system for a rapid response power conversion device – Sarcos Investments
http://www.google.com/patents/US7066116

 

2005

 

Dynamic Simulation of a Free-Piston Linear Alternator in Modelica
https://modelica.org/events/Conference2005/online_proceedings/Session5/Session5a2.pdf

Operational Strategies for a Free Piston Energy Converter
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.66.1375&rep=rep1&type=pdf

COMBUSTION MODELLING Assessing the HCCI Characteristics of n-Heptane using a Free Piston Rapid Compression Expansion Machine
http://ci.confex.com/ci/2005/techprogram/P1944.HTM

CFD Modeling of a Two-Stroke Free Piston Energy Converter using Detailed Chemistry
http://papers.sae.org/2005-24-074/

The Linear Engine in 2004
http://papers.sae.org/2005-01-2140/

Minimizing Power Pulsations in a Free Piston Energy Converter
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.65.7827&rep=rep1&type=pdf

A Proposed Hybrid Electric Power Train for Trucks
http://www.freepistonpower.com/Hybrid%20Electric%20Truck%20Concept%2026-Oct-05.pdf

Ensuring steady operation of free-piston generator
http://www.iiisci.org/journal/CV$/sci/pdfs/P651645.pdf

A novel concept of a Transverse Flux Linear Free-Piston Generator
http://kth.diva-portal.org/smash/get/diva2:453838/FULLTEXT01

A Linear Permanent Magnet Generator for a Free-Piston Energy Converter
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=1531540&queryText%3DFree-piston+Generator

Generic free-piston engine with transformer valve assembly for reducing throttling losses – Mannesmann Rexroth
http://www.google.es/patents/US6863507

Microgenerator of electrical energy – C.R.F. Societa Consortile per Azioni
http://www.google.cl/patents/US6932030

Linear-motion engine controller and related method - Aerovironment
http://www.google.com/patents/US6856107

Free piston engine and power generation system therewith  - Denso Corporation
http://www.google.com/patents/US6945202

Air scavenging for an opposed piston opposed cylinder free piston engine – Ford
http://www.google.com/patents/US6941904

Electromagnetic servo valve strategy for controlling a free piston engine - Ford
http://www.google.com/patents/US6971339

Compression pulse starting of a free piston internal combustion engine - Ford
http://www.google.com/patents/US6971340

 

Compression pulse starting of a free piston internal combustion engine having multiple cylinders - Ford
http://www.google.com/patents/US6966280

Electromagnetic servo valve strategy for controlling a free piston engine - Ford
http://www.google.com/patents/US6971339

Fuel injection for a free piston engine – Ford
http://www.google.com/patents/US6959672

Controllable combustion method and device – Sarcos Investments
http://www.google.com/patents/US6938588

Rapid response power conversion device
http://www.google.com/patents/US6957631

 

2004

 

Design Approach for a Two-Stroke Free Piston Engine for Electric Power Generation
http://papers.sae.org/2004-32-0037/

Computational Design Studies for a High-Efficiency and Low-Emissions Free Piston Engine Prototype
http://papers.sae.org/2004-01-2928/

Simulation of a Two-Stroke Free Piston Engine
http://papers.sae.org/2004-01-1871/

Linear Engine Development for Series Hybrid Electric Vehicles
http://bit.ly/1tb3grR

Use of transverse-flux machines in a free-piston generator
http://bit.ly/1yVZTIX

Possibilities of Linear Combustion Engine Control
http://bit.ly/1678oSD

Model and Experiments on Linear Combustion Engine
http://bit.ly/ZN18Lm

The Free Piston Engine: The Automotive Prime Mover of the Future?
http://bit.ly/15EhsuF

Device including a combustion engine, a use of the device, and a vehicle – ABB
http://www.google.com/patents/US6748907

Linear generator with induction coil which moves with respect to fixed permanent magnets – Dauber Holdings
http://www.google.com/patents/US6707175

Energy converter – Clavis Technology
http://www.google.com/patents/US6759755

 

2003

 

Toward the Development of a Thermodynamic Fuel Cell - DOE Sandia Labs
http://www1.eere.energy.gov/hydrogenandfuelcells/pdfs/merit03/28_snl_peter_van_blarigan.pdf

Developing a Thermodynamic Fuel Cell - DOE Sandia Labs
http://www1.eere.energy.gov/hydrogenandfuelcells/pdfs/ixb1_vanblarigan.pdf

APPLICATION OF A FREE-PISTON GENERATOR IN A SERIES HYBRID VEHICLE
http://www.ee.kth.se/php/modules/publications/reports/2003/IR-EE-EME_2003_020.pdf

The Free Piston Power Pack: Sustainable Power for Hybrid Electric Vehicles – Pempek Systems
http://papers.sae.org/2003-01-3277/

Optimizing the Scavenging System for a Two-Stroke Cycle, Free Piston Engine
for High Efficiency and Low Emissions: A Computational Approach - DOE Sandia Labs
http://papers.saeorg/2003-01-0001/

Fabrication and testing of linear electric generator for use with a free-piston engine
http://bit.ly/1CS2gd6

Use of transverse-flux machines in a free-piston generator
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=1210639&queryText%3DFree-piston+Generator

Dynamics and control of a free-piston diesel engine
http://www.itk.ntnu.no/ansatte/Johansen_Tor.Arne/klc_struc4.pdf

Dynamics and Control of a Free-Piston Diesel Engine
http://dynamicsystems.asmedigitalcollection.asme.org/article.aspx?articleid=1410073

INVESTIGATING MANUFACTURING DEFECTS IN A LINEAR TRANSVERSE-FLUX MACHINE FOR A FREE-PISTON GENERATOR
http://www.ee.kth.se/php/modules/publications/reports/2003/IR-EE-EME_2003_019.pdf

NUMERICAL SIMULATION FOR PARAMETRIC STUDY OF A TWO-STROKE
COMPRESSION IGNITION DIRECT INJECTION LINEAR ENGINE
http://bit.ly/1w4UNZH

USE OF TRANSVERSE-FLUX MACHINES IN A FREE-PISTON GENERATOR
http://www.ee.kth.se/php/modules/publications/reports/2003/IR-EE-EME_2003_028.pdf

A Low-Leakage Linear Transverse-Flux Machine for a Free-Piston Generator
http://kth.diva-portal.org/smash/record.jsf?pid=diva2:9382

ANALYTICAL ANALYSIS AND DIMENSIONING OF A LOWLEAKAGE
LINEAR TRANSVERSE-FLUX MACHINE
http://www.ee.kth.se/php/modules/publications/reports/2004/IR-EE-EME_2004_028.pdf

Design and development of a prototype free piston linear generator engine
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.109.5991&rep=rep1&type=pdf

Free piston engine with electrical power output - Caterpillar Inc
http://www.google.com/patents/US6541875

Opposed piston linearly oscillating power unit
http://www.google.com/patents/US6532916

Fully-controlled, free-piston engine – U.S. EPA
http://www.google.com/patents/US6652247

Fully-controlled, free-piston engine – U.S. EPA
http://www.google.com/patents/US6582204

Free-piston engines
http://www.google.com/patents/US6651599

Cyclically operated fluid displacement machine –Lotus Cars
http://www.google.com/patents/US6626650

Free-piston device provided with an electric linear drive
http://www.google.com/patents/WO2003091556A1?cl=en

 

2002

 

Investigation of Advanced Power Plants and Multiple Use Applications for Single Occupancy Vehicles - DOE Sandia Labs
http://prod.sandia.gov/techlib/access-control.cgi/2001/018711.pdf

FREE PISTON ENGINE MICRO ENGINE  - DARPA
http://www.me.umn.edu/~haich/engine/intro.html

TOWARDS A LINEAR ENGINE thesis
http://www-cdr.stanford.edu/dynamic/linear_engine/thesis.pdf

ADVANCED INTERNAL COMBUSTION ELECTRICAL GENERATOR
http://www1.eere.energy.gov/hydrogenandfuelcells/pdfs/32405b24.pdf

Numerical Simulation for Parametric Study of a Two-Stroke Direct Injection Linear Engine
http://papers.sae.org/2002-01-1739/

Miniature free-piston homogeneous charge compression ignition engine-compressor concept—Part I: performance
estimation and design considerations unique to small dimensions
http://www.me.umn.edu/~mrz/pdf_papers/2002_chem_E_sci_part1.pdf

Miniature free-piston homogeneous charge compression ignition engine-compressor concept—Part II: modeling
HCCI combustion in small scales with detailed homogeneous gas phase chemical
http://www.me.umn.edu/~mrz/pdf_papers/2002_chem_E_sci_part2.pdf

Design Considerations, Modeling, and Analysis of Micro- Homogeneous Charge Compression Ignition Combustion Free
-Piston Engines
http://www.menet.umn.edu/~haich/thesis2.pdf

Integrated Free-Piston Generators: An Overview
http://www.ee.kth.se/php/modules/publications/reports/2002/IR-EE-EME_2002_021.pdf

Finding an appropriate electrical machine for a free piston generator
http://www.ee.kth.se/php/modules/publications/reports/2002/IR-EE-EME_2002_003.pdf

Microcombustion engine/generator - Honeywell International Inc.
http://www.google.com/patents/US6397793

Miniature generator – Aerodyne Research
http://www.google.com/patents/US6349683

Free piston engine and self-actuated fuel injector therefor
http://www.google.com/patents/US6349682

 

2001

 

ADVANCED INTERNAL COMBUSTION ELECTRICAL GENERATOR - DOE
http://www1.eere.energy.gov/hydrogenandfuelcells/pdfs/30535bf.pdf

Investigation of Advanced Power Plants and Multiple Use Applications for Single Occupancy Vehicles Performance
Simulation of a Compression Ignition Free Piston Engine
http://prod.sandia.gov/techlib/access-control.cgi/2001/018711.pdf

Performance Simulation of a Compression Ignition Free Piston Engine
http://papers.sae.org/2001-01-0280/

Galileo Research CL&P Research Paper (Data on Initial Prototype, not ideal Free Piston Engine technology)
 (very large file, be patient after clicking)
Galileo Research CL&P Research Paper 

Galileo Prototype Adv Ignition DataTable 5-17-01A
2001 (Data on Initial Prototype Spark-Ignition Free Piston Engine)

Galileo Prototype DataTable 5-3-01-A
 2001 (Data on Initial Prototype Spark-Ignition Free Piston Engine)

Internal combustion engine for motor vehicle, has linear generator with permanent magnet(s) on piston rod moved axially
and reciprocally in coil winding when dual piston oscillates  - VW
http://worldwide.espacenet.com/publicationDetails/biblio?CC=DE&NR=19943993A1&KC=A1&FT=D

Micro-Homogeneous Charge Compression Ignition (HCCI) Combustion: Investigations Employing Detailed Chemical Kinetic
 Modeling and Experiments
http://www.menet.umn.edu/~haich/paper2.pdf

CONCEPTUAL ANALYSIS OF A FOUR-STROKE LINEAR ENGINE
http://wvuscholar.wvu.edu:8881//exlibris/dtl/d3_1/apache_media/L2V4bGlicmlzL2R0bC9kM18xL2FwYWNoZV9tZWRpYS81OTgw.pdf

Internal combustion engine for motor vehicle, has linear generator with permanent magnet(s) on piston rod  moved axially
and reciprocally in coil winding when dual piston oscillates  - VW
http://worldwide.espacenet.com/publicationDetails/biblio?CC=DE&NR=19943993A1&KC=A1&FT=D

Galileo Distributed Generation
Galileo Distributed Generation.pdf

Internal combustion engine for motor vehicle, has linear generator with permanent magnet(s) on piston rod
moved axially and reciprocally in coil winding when dual piston oscillates - VW
http://worldwide.espacenet.com/publicationDetails/biblio?CC=DE&NR=19943993A1&KC=A1&FT=D

Free-Piston Engine - DOE Sandia Labs
http://www.google.com/patents/US6199519

Free piston internal combustion engine – Sunpower
http://www.google.com/patents/US6170442

Microcombustion engine/generator – Honeywell International

http://www.google.com/patents/US6276313

 

2000

 

ADVANCED INTERNAL COMBUSTION ENGINE RESEARCH - DOE
http://www1.eere.energy.gov/hydrogenandfuelcells/pdfs/28890yy.pdf

Free Piston Engine Its Application and Optimization - FEV Engine Technology
http://papers.sae.org/2000-01-0996/

Comparison Between Single-Step and Two-Step Chemistry in a Compression Ignition Free Piston Engine
http://papers.sae.org/2000-01-2937/

A Diesel Two-Stroke Linear Engine
http://wvuscholar.wvu.edu:8881//exlibris/dtl/d3_1/apache_media/L2V4bGlicmlzL2R0bC9kM18xL2FwYWNoZV9tZWRpYS80Nzg0.PDF

First Cycles of the Dual Hydraulic Free Piston Engine
http://papers.sae.org/2000-01-2546/

Performance Simulation of a Compression Ignition Free Piston Engine
http://papers.sae.org/2001-01-0280/

Horsepower with Brains: The Design of the CHIRON Free Piston Engine
http://papers.sae.org/2000-01-2545/

Miniature reciprocating combustion-driven machinery – Georgia Tech Research
http://www.google.com/patents/US6109222

Method for absorbing the vibration of a free-piston engine and vibration-absorbed free-piston engine – Sampower
http://www.google.com/patents/US6135068

Method For Operating Of A Free Piston Engine - Caterpillar
http://www.google.com/patents/US6135069

Free Piston Internal Combustion Engine With Rotating  Piston – Caterpillar
http://www.google.com/patents/US6105541

Injector System For Free-Piston Engines
http://www.google.com/patents/US6050244

Free Piston Internal Combustion Engine – Sunpower
http://www.google.com/patents/US6035637

 

1999

 

Sandians' pursuit of ideal engine cycle for electricity generation wins honors
http://www.sandia.gov/LabNews/LN10-22-99/cycle_story.html

A Numerical Study of a Free Piston IC Engine Operating on Homogeneous Charge Compression Ignition Combustion -
DOE Sandia Labs
http://papers.sae.org/1999-01-0619/

Homogeneous Charge Compression Ignition Free Piston Linear Alternator - Sandia Labs
http://prod.sandia.gov/techlib/access-control.cgi/1999/998206.pdf

Numerical Simulation of a Two-Stroke Linear Engine-Alternator Combination
http://papers.sae.org/1999-01-0921/

High Output Alternator Concepts - BOSCH
http://papers.sae.org/1999-01-1092/

Design and testing of a novel linear alternator and engine system for remote electrical power generation
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=747434&contentType=Conference+Publications

Free-Piston Diesel-Fueled Linear Alternator for Auxiliary Power Unit Applications 1999
http://www.stormingmedia.us/33/3335/A333593.html

Field Analysis and Design of a Moving Iron Linear Alternator for Use with Linear Engine
http://wvuscholar.wvu.edu:8881/exlibris/dtl/d3_1/apache_media/L2V4bGlicmlzL2R0bC9kM18xL2FwYWNoZV9tZWRpYS80NjUy.pdf

Optimization of a brushless permanent magnet linear alternator for use with a linear
internal combustion engine
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.202.7885&rep=rep1&type=pdf

Free piston combustion engine with electrical energy delivery e.g. for hybrid automobile, heating plant or mobile current generator  
http://worldwide.espacenet.com/publicationDetails/biblio?CC=DE&NR=19813992A1&KC=A1&FT=D

Linear electrical energy generator
http://www.google.com/patents/US5893343

 

1998

 

Homogeneous Charge Compression Ignition with a Free Piston: A New Approach to Ideal Otto Cycle Performance –
DOE Sandia Labs
http://papers.sae.org/982484/

Fundamental Analysis of a Linear Two-Cylinder Internal Combustion Engine
http://papers.sae.org/982692/

Two-Stroke Linear Engine
http://bit.ly/1wiNZFi

Free piston internal combustion engine - Sunpower
https://www.google.com/patents/US5775273

Free piston variable-stroke linear-alternator generator – Lockheed Martin Energy
https://www.google.com/patents/US5850111

Electrically powered motor vehicle with linear electric generator
http://www.google.com/patents/US5788003

 

1997

 

Video – Galileo Prototype –1 - 1997
http://www.galileo-fpe.com/assets/multimedia/Galileo_FPE_1997_Prototype_Run.MPG

Linear electric actuators and generators
http://bib.convdocs.org/v24059/?download=1

 

1996

 

A High Specific Energy Output Free Piston Engine-Generator (HISEN-FPEG) for Hybrid Electric Vehicles
and Electric Utility Power Generation - Galileo Research 
http://bit.ly/ZFflto

The Combustion Process in a DI Diesel Hydraulic Free Piston Engine
http://papers.sae.org/960032/

Method for the cold start of a free-piston engine; and free-piston engine adapted for use of this method – Innas
Free Piston B.V.http://www.google.com/patents/US5540193

 

1995

 

FREE-PISTON ENGINE LINEAR GENERATOR FOR HYBRID VEHICLES MODELING STUDY
by Engine and Vehicle Research Division Southwest Research Institute FOR DARPA 1995
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA294318

Free-Piston Engine Linear Generator for Hybrid Vehicles Modeling Study –
Southwest Research for DARPA
http://www.stormingmedia.us/81/8134/A813492.html

 

1994

 

A Review of Free Piston Engine Concepts
http://papers.sae.org/941776/

A Free Piston Engine Generator
Galileo Research SBIR RA 94-024 DARPA PROPOSAL Part 1
http://galileo-fpe.com/assets/documents/Galileo-SBIR-RA-94-24-Proposal-Part-1-1994.pdf

A Free Piston Engine Generator
Galileo Research SBIR Proposal to Department of AIR FORCE 1994
http://galileo-fpe.com/assets/documents/Galileo-SBIR-AF94-182-Proposal-to-Department-of-AIR-FORCE-1994.pdf

Use of transverse-flux machines in a free-piston generator
http://bit.ly/1yVZTIX

Free piston engine control system - Tectonics
https://www.google.com/patents/US5287827

 

1993

Free Piston Engine-Generator Employing Homogeneous Charge Compression Ignition Type Combustion
(SBIR RA 93-24 Proposal to DARPA) - Galileo Research 
http://galileo-fpe.com/assets/documents/Galileo-SBIR-TRP-RA-93-24-Proposal-to-DARPA-1993.pdf

 

1991

Computer optimized hybrid engine
http://www.google.com/patents/US5002020

1990

Free-piston engine without compressor – RDG Inventions
http://www.google.com/patents/US4924956

Unsymmetrical free piston engine
http://www.google.com/patents/US4896632

1989

Internal combustion engine, particularly, a free-piston engine
http://www.google.com/patents/US4803960

Two stroke cycle engine
http://www.google.com/patents/US4876991

Internal combustion engine
http://www.google.com/patents/US4831972

1988

Design Feasibility of a Free Piston Internal Combustion Engine/Hydraulic Pump
http://papers.sae.org/880657/

1985

Method and apparatus for producing electrical energy from a cyclic combustion process utilizing coupled pistons which
 reciprocate in unison
http://www.google.com/patents/US4532431

1984

Free-piston engine with operatively independent cam
https://www.google.com/patents/US4480599

1983

Free-piston electric current generator
http://www.google.com/patents/US4403153

A Free Piston Engine-Pump for an Automotive Propulsion System
http://papers.sae.org/810266/

1979

Non-polluting heat machine with internal combustion - Jarret
http://www.google.com/patents/US4154200

1978

Free piston engine with opposed cylinders
http://www.google.com/patents/US4085711

1973

The Braun Linear Engine
http://papers.sae.org/730185/

COMBUSTION ENGINE DRIVEN GENERATOR INCLUDING SPRING STRUCTURE FOR OSCILLATING
THE INDUCTOR AT THE MECHANICAL RESONANT FREQUENCY BETWEEN POWER STROKES
http://www.google.com/patents/US3766399

FREE PISTON ENGINE STARTING APPARATUS
http://www.google.com/patents/US3769950

1972

FREE PISTON ENGINE IGNITION APPARATUS
http://www.google.com/patents/US3643638

1971

FREE PISTON GENERATOR - GE
http://www.google.com/patents/US3629596

BALANCED-FREE PISTON ENGINE
http://www.google.com/patents/US3610217

1970

Electromagnetic generators
http://www.google.com/patents/US3541362

1966

Free piston electrical generator
http://www.google.com/patents/US3234395

1963

Free-piston generator of electric current – Esso Research
http://www.google.com/patents/US3105153

1960

Floating Piston Engines - Jarret
http://www.google.com/patents/US2966148

1930

Internal combustion power plant
http://www.google.com/patents/US1785643