基于混合动力起动模式发动机起动过程HC排放试验研究

Experimental Investigation on HC Emission in Starting Process of Engine Base on Hybrid Starting Mode

针对ISG型混合动力汽车发动机起动过程中HC排放问题,试验中采用了混合动力起动模式,研究了不同电机拖转转速和不同的冷却液温度条件下发动机起动过程HC的排放控制。不同的ISG电机拖转转速影响缸内混合气的混合与燃烧,合适的拖转转速可以减少HC的排放。试验证明:在常温起动阶段,发动机HC排放性能最佳电机拖转转速为1200r.min-1。试验分析了不同冷却液温度下起动过程HC生成的机理,为HC排放的优化控制提供了理论依据。

According to the HC emission problems during the starting process of engine in ISG（Integrated Starter Generator） PHEV（Parallel Hybrid Electrical Vehicle）,this experiment adopts the hybrid starting mode.The HC emission control is preliminarily studied during the starting process under different motor drive speeds and coolant temperatures.The different ISG motor drive speeds influence the mixing and combustion of cylinder mixture,and the HC emission is reduced under the appropriate motor drive speed.The result shows that： the best drive speed is 1200r/min in which the HC emission is the lowest in the normal temperature starting process.This paper analyses the formation mechanism of the HC during starting process in different coolant temperature and provide theory basis for optimizing the HC emission control.