:通过改进柴油机供油系统和利用废气再循环来改善混合气质量和燃烧过程 ,进而降低其有害排放。结果表明 ,推迟喷油提前角 ,适当降低喷油压力 ,抑制初期喷油率 ,减小高压油管直径 ,利用废气再循环以及几种方法的结合能够有效地降低排放。 : Reduce its harmful emissions by improving diesel fuel delivery systems and using exhaust gas recirculation to improve mixture quality and combustion processes. The results show that the postponement of injection advance angle, the appropriate reduction of injection pressure, suppression of initial injection rate, reduction of high-pressure tubing diameter, exhaust gas recirculation and a combination of several methods can effectively reduce emissions.