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采用快速取样阀在一台单缸发动机排气口进行ＨＣ取样，对排气口ＨＣ取样浓度曲线进行分析，并采用向排气口喷射ＨＣ示踪气体来研究滞留在排气口附近的ＨＣ的氧化情况及其影响因素。试验表明：在排气开始阶段，ＨＣ浓度高峰是由于上一循环排出并停留在排气口附近、ＨＣ浓度较高的气体倒流产生的。此外，排气口处的温度对ＨＣ的氧化也有较大影响
HC sampling was performed on a single-cylinder engine exhaust port by using a quick sampling valve, HC sampling concentration curve of the exhaust port was analyzed, and HC tracer gas was jetted to the exhaust port to study HC remaining in the exhaust port Oxidation and its influencing factors. Experiments show that at the beginning of the exhaust phase, the peak of HC concentration is due to the backflow of the gas with the higher concentration of HC due to the discharge of the previous cycle and staying near the exhaust port. In addition, the temperature at the exhaust port also has a significant effect on the oxidation of HC