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.
Issue Section:
Research Papers
Topics:
Optimization,
Spark-ignition engine,
Valves,
Engines,
Computer simulation,
Design,
Motors,
Polynomials,
Simulation,
Testing,
Torque
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Copyright © 1990
by The American Society of Mechanical Engineers
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