Valve Event Optimization in a Spark-Ignition Engine

[+] Author and Article Information
D. N. Assanis

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

M. Polishak

Research and Development, Amoco Oil Company, Naperville, IL 60566

J. Eng. Gas Turbines Power 112(3), 341-347 (Jul 01, 1990) (7 pages) doi:10.1115/1.2906501 History: Received May 01, 1989; Online April 24, 2008


A computer simulation has been modified to study the effects of valve event parameters (lift, duration, and phasing) on spark-ignition engine performance. The zero-dimensional model employs polynomial and dynamic techniques to generate cam profiles for valve event optimization. The model was calibrated and validated against data from a General Motors 2.5-liter engine. The simulation was then used to determine optimum valve events under different engine conditions. This insight was used to improve the cam design. Subsequent engine testing confirmed that a 3 percent improvement in peak torque could be obtained with the optimized cam.

Copyright © 1990 by The American Society of Mechanical Engineers
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