发动机工作情况与燃烧质量直接关系,而发动机尾气可反应对混合气的燃烧情况。通过检测和分析发动机不同工况下尾气的成分,可以判断发动机各系统是否正常,也可以据此对汽油发动机系统进行故障诊断。本文介绍混合气的燃烧过程、废气的生成、利用发动机尾气分析结果对发动机各系统进行故障诊断的方法。 Engine performance and combustion quality is directly related to the engine exhaust can reflect the combustion of the mixture. By detecting and analyzing the composition of exhaust gases under different operating conditions of the engine, it is possible to determine whether the engine systems are normal or not, and to perform fault diagnosis on the gasoline engine system accordingly. This paper introduces the combustion process of mixed gas, the generation of exhaust gas and the method of fault diagnosis of engine systems by using the result of engine exhaust gas analysis.