在汽车发展的历史上,曾经历过使人震惊的40年代和70年代发生的美国洛杉矶和日本东京等地的光化学事件以及震撼所有经济发达国家的石油危机,促使工业发达国家的政府和汽车制造厂家极其重视汽车的节能、减污工作。早先车用汽油机上的节能和减少排放污染物的装置是由机械控制的,尚能满足相对来说不太严格的排放标准的要求,所以车 In the history of automobile development, the photochemical incidents that have shocked the world in the 1940s and 1970s, such as Los Angeles in the United States and Tokyo in Japan, and the oil crisis that has shocked all economically developed countries have prompted the governments and automobile manufacturers in industrialized countries Manufacturers attach great importance to the car’s energy-saving, pollution reduction. Previously, the energy-saving and pollutant reduction devices on vehicle gasoline engines were mechanically controlled and still meet the relatively less stringent emission standards requirements, so the vehicles