So it is significant for harmful substance control of engine to be researched on influence of equal temperature time playing on emission of engine in cold-start,and getting qualitative conclusion through analysis on test and course.

• 而就发动机的均温时间(停机时间)对冷起动排放的影响展开研究,并通过试验及过程分析,定性地得出结论,对控制发动机有害物质的排放具有十分积极的意义。