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A Novel Approach to Free-Piston Engine Control Using an FPGA Based Control System

[+] Author Affiliations
Matthew Viele, Carroll G. Dase

Drivven, Inc., Elizabeth, CO

Eric E. Shorey, Karl V. Hoose, Kendrick H. Light

Applied Thermal Sciences, Inc., Stanford, ME

Paper No. ICEF2011-60225, pp. 823-835; 13 pages
  • ASME 2011 Internal Combustion Engine Division Fall Technical Conference
  • ASME 2011 Internal Combustion Engine Division Fall Technical Conference
  • Morgantown, West Virginia, USA, October 2–5, 2011
  • ISBN: 978-0-7918-4442-7
  • Copyright © 2011 by ASME


The variable stroke length of the free-piston engine poses an interesting problem for the controls engineer. At a low level, the control system must be able to track piston position and address changes in top and bottom dead center positions. To accomplish this, a new FPGA (field programmable gate array) based engine position tracking software was developed, along with a simple method of mapping from a conventional engine control system to a free-piston control system. The tracking software was integrated into a complete rapid prototyping control system that was responsible for all control actions of the engine. The control system was laboratory tested on the HiPerTEC, an opposed, free-piston engine with a circular piston arrangement (as opposed to linear free-piston engines) developed by Applied Thermal Sciences, Inc (ATS). The control system has been demonstrated to run 8 cylinders up to an effective speed of 2,200rpm in spark ignition mode.

Copyright © 2011 by ASME



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