柴油机自诞生以来以其良好的动力性、经济性和可靠性成为汽车工业的主要动力,但随着世界机动车保有量的迅速增加,柴油机工作噪声大、微粒(PM)和氮氧化物(NOx)排放高也给环境保护带来了巨大的压力。为保护环境和节约能源,世界各国相继制定并实施了越来越严格的柴油机排放标准,因 Since its birth, diesel engine has become the main driving force of automobile industry due to its good power, economy and reliability. However, with the rapid increase in the number of motor vehicles in the world, diesel engine has a lot of noise, such as particulate matter (PM) and nitrogen oxides ) High discharge also brings tremendous pressure on the environment. In order to protect the environment and save energy, all countries in the world have successively formulated and implemented more and more strict diesel emission standards.