Control-Oriented Model of a Dual Equal Variable Cam Timing Spark Ignition Engine

[+] Author and Article Information
A. G. Stefanopoulou, J. A. Cook

Ford Motor Company, Scientific Research Laboratory, PO Box 2053, Mail Drop 2036 SRL, Dearborn, MI 48121

J. W. Grizzle, J. S. Freudenberg

Control Systems Laboratory, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109-2122

J. Dyn. Sys., Meas., Control 120(2), 257-266 (Jun 01, 1998) (10 pages) doi:10.1115/1.2802417 History: Received November 12, 1996; Online December 03, 2007


A control-oriented engine model is developed to represent a spark ignited engine equipped with a variable cam timing mechanism over a wide range of operating conditions. Based upon laboratory measurements a continuous, nonlinear, low-frequency phenomenological engine model is developed. With respect to a fixed-cam timing engine, the VCT mechanism alters the mass air flow into the cylinders, the torque response, and the emissions of the engine. The developed model reflects all of these modifications and includes a representation of the breathing process, torque and emission generation, and sensor/actuator dynamics. The model has been validated with engine-dynamometer experimental data and can be used in powertrain controller design and development.

Copyright © 1998 by The American Society of Mechanical Engineers
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