采用数学规化的方法优化汽油机的工作过程,可以在限制发动机热负荷、机械负荷、氧化氮排放和不爆震的条件下,使发动机在运行过程中经济性最好.但是要求得比较精确的优化解,一般要进行大量计算,花费较多机时.本文提出了一种分段、分层、分级的递进优化方法,应用于汽油机工作过程的优化计算中,取得了较好的效果. Optimizing the working process of a gasoline engine by using the method of mathematical rules can make the engine be most economical in operation under the conditions of limiting engine heat load, mechanical load, nitrogen oxide emission and no knocking, but the more accurate Optimum solution usually takes a large number of calculations and costs more time.This paper presents a progressive, sub-hierarchical, hierarchical optimization method used in the optimization calculation of gasoline engine working process, and achieved good results.