A Combustion Correlation for Spark-Ignition Engine Simulation Under Steady and Transient Conditions

A Spark-ignition combustion correlation is presented that links the fuel burning rate with in-cylinder vaules of temperature, pressure, fuel-air equivalance ratio, speed, ignition timing and residual gas-fraction. The correlation is designed to be used in a multi-cylinder engine simulation to study the influence of manifold, valve, supercharging and turbocharging systems design on performance. It is shown how the correlation permits transient performance predictions for a turbocharged engine.