A research program is conducted to determine the effect of advance injection angle s varieties on exhaust emission and the power performance of LPG-diesel dual-fuel engine.

There are many factors to affect the numerical calculation of the vehicle emission ,such as design structure,operation states,fuel specifications,test data,adjustment of calculating program,etc.

An effective method to reduce gasoline engine emission is the application of fuel comburant additives, whose effect on the combustion processes has been analyzed in this paper.