由于柴油机的压缩比和功率大,热效率比汽油机约高30%～40%,并且有优异的转矩特性,故障少,使用寿命长,因此深受人们的喜爱,现广泛用于大中型客货汽车、农业机械、工程机械及国防车辆等。在柴油机排气污染物中,CO和HC的含量较低,但NOx和颗粒物含量较高,其中颗粒物含量 Because diesel engine compression ratio and power, thermal efficiency than the gasoline engine about 30% ~ 40%, and has excellent torque characteristics, less failure, long service life, so loved by people, is now widely used in large and medium-sized passenger and cargo Automotive, agricultural machinery, construction machinery and defense vehicles. In the diesel engine exhaust pollutants, CO and HC content is low, but the higher the content of NOx and particulate matter, particulate matter content