Study on Heat Release of Gasoline Engine with Tumble Generating Stratified-EGR Technique

Stratified charge technique has a promising in realizing gasoline clean combustion,lower fuel consumption and higher power output.It is necessary to optimize the engine overall performances for tumble generating stratified-EGR technique.The available simulation programs have been widely used in engine optimization study.However,the combustion in stratified charge engine is different from that in homogeneous charge engine,thus some modifications should be made in using these programs.This paper presents a simple method for predicting the pressure of SI engine with tumble generating stratified-EGR,using a simplified single zone combustion model,in which two exponential functions are introduced to calculate the rate of fuel burned in different charge zones.The validity of the model was made by comparing the model results with those of engine testing.Good agreement between the measured cylinder pressure and calculated cylinder pressure is obtained.