随着温室效应导致全球暖化以及空气污染日益严重,环保意识逐渐抬头,然而对于汽车产业却是相当大的冲击,全球车厂无不积极研发低排放、高效率的动力系统,但为数众多的汽车对于环境改善的效果并不显着。于是,越来越多国家开始对汽车产业制定了针对性的政策,以期为减缓 With the warming of the greenhouse effect and the worsening of air pollution, the awareness of environmental protection is on the rise. However, it is a considerable impact on the automobile industry. Global auto plants are all actively developing low-emission and highly efficient power systems. However, The effect of environmental improvement is not significant. As a result, more and more countries began to formulate targeted policies for the automobile industry with a view to mitigating