通过系统地改变采用无压力室式喷油器的小型直喷式柴油机的设计参数和工作参数进行发动机试验,分析排气中HC的生成原因。结果表明,HC生成的主要原因是在滞燃期内形成稀混合气、燃油喷雾附着在燃烧室壁面、喷油结束前的喷雾残滴及压缩间隙的粹熄等。 By systematically changing the design parameters and operating parameters of a small direct injection diesel engine using a pressureless chamber injector, the engine test was conducted to analyze the cause of HC generation in the exhaust gas. The results show that the main reason for the formation of HC is the formation of lean mixture during the retarding period, the adhesion of the fuel spray to the wall of the combustion chamber, the spray residual droplets before the fuel injection and the elimination of the compression gap.