This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Miniature HCCI Free-Piston Engine Compressor For Orthosis Application
Published November 03, 2009 by Society of Automotive Engineers of Japan in Japan
Annotation ability available
A miniature homogenous charge compression ignition (HCCI) free-piston engine compressor aimed at an ankle-foot orthosis application is described. Analysis of the human ankle shows that a fluid power source in the neighborhood of 10 W is needed. To account for compressor and actuator inefficiencies, the power output at the engine cylinder is designed to be 30 W.
A compact engine compressor package has been designed and mathematically modeled. Experiments using existing engine components characterized the leakage model. Through the dynamic simulation of the engine, major parameters of the engine have been specified. Simulations indicate that the HCCI free-piston engine compressor, designed in a prototype package scale of about 80×40×20 mm is a viable compact and efficient fluid power supply. Simulation results demonstrate that the overall efficiency of the engine compressor is expected to be 5.9% and that the package should have a higher energy density than batteries.
CitationTian, L., Kittelson, D., and Durfee, W., "Miniature HCCI Free-Piston Engine Compressor For Orthosis Application," SAE Technical Paper 2009-32-0176, 2009.
- Winter D. Biomechanics and Motor Control of Human Movement 3rd 2005 Wiley
- Riofrio Jose A. Design, “Modeling and Experimental Characterization of a Free Liquid-Piston Engine Compressor with Separated Combustion Chamber” 2008 Vanderbilt University
- Alleyne Andrew Durfee William Hsiao-Wecklser Liz Loth Eric Kogler Geza Jain Manak Xia Jicheng Thomas Jason Gilmer Joel Shorter Alex 2009 CCEFP TB6 presentation at Univ. of Minnesota Minneapolis
- Aichlmayr H. T. “Design Considerations, Modeling, and Analysis of Micro-Homogeneous Charge Compression Ignition Combustion Free-Piston Engines” 2002 University of Minnesota
- Pescara R.P. “Motor Compressor Apparatus” 1928 U.S. Patent 1,657,641
- Neumann K. “Junkers free-piston compressor” 1935 American Society of Mechanical Engineers 57 4
- Braun A.T. Schweitzer Paul H. “Braun Linear Engine” 1973 SAE Preprint 730185
- Mikalsen R. Roskilly A.P. “A review of free-piston engine history and applications” 2007 Applied Thermal Engineering 27 14-15
- Annen Kurt D. Stickler David B. Woodroffe Jim “Glow Plug-Assisted HCCI Combustion in a Miniature Internal Combustion Engine Generator” 2006 44 th AIAA Aerospace Science Meeting
- Taylor C. F. “The Internal Combustion Engine in Theory and Practice: Volume I: Thermo-dynamics, Fluid Flow, Performance” 1985 The M.I.T. Press Cambridge, MA
- Sher I. Levinzon-Sher D. Sher E. “Miniaturization Limitations of HCCI Internal Combustion Engines” 2009 Applied Thermal Engineering 29
- Grinnel S.K. “Flow of a Compressible Fluid in a Thin Passage” 1955 American Society of Mechanical Engineers
- Hinds E. T. Blair G. P. “Unsteady Gas Flow Through Reed Valve Induction Systems,” 1978 SAE Paper
- Blair G. P. Hinds E. T. “Predicting the Performance Characteristics of Two-Cycle Engines Fitted with Reed Induction Valves,” 1979 SAE Paper
- Fleck R. Cartwright A. Thornhill D. “Mathematical Modeling of Reed Valve Behavior in High Speed Two-Stroke Engines,” 1997 SAE Paper
- Shaver Gregory M. Gerdes J. Christian Jain Parag Caton P.A. Edwards C.F. “Modeling for Control of HCCI Engines” 2003 Proceeding of the 2003 American Control Conference
- Annand W.J.D. “Heat Transfer in the Cylinder of Reciprocating Internal Combustion Engines” 1963 Proceedings of the Institution of Mechanical Engineers 177 36
- Barth Eric J. Riofrio Jose “Dynamic Characteristics of a Free Piston Compressor” 2004 Proceeding of ASME International Mechanical Engineering Congress and Exposition 2004