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Development of Process for Spark Timing Optimization Using Engine Cycle Simulator
Published October 27, 2004 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
An engine cycle simulator that predicts in-cylinder pressure during the gas exchange process and the combustion process has been developed. The simulator calculated pressure time histories at the various operating conditions in a gasoline engine with a variable valve timing control system. The pressure data yielded MBT (Minimum spark advance for Best Torque) and also knock limit. Comparing the computed results with experimental ones, empirical model expressing the airflow rate through the valve, ignition delay, turbulent flame propagation and knock behavior and their model constants were optimized. The availability of the process for spark timing optimization with the engine cycle simulator was examined.