关键词: 燃油蒸发系统；泄漏检测；进油口压力测试；蒸发排放污染物测试；油箱盖

Abstract: The present situation of evaporative emission of gasoline vehicles in a city is studied through a spot check on the evaporative pollutant control system of 2 000 gasoline vehicles in the city. In the process of spot check, the fuel tank cap test, the fuel inlet pressure test and the evaporation pollutant discharge test are mainly carried out. Firstly, in view of the low detection rate of fuel tank cap pressure, it is recommended to add relevant equipment to improve the detection rate; secondly, in view of the problem that the pipe cannot be clamped in the fuel inlet pressure detection, it is necessary to optimize the detection process or update the detection equipment; then, it is also necessary to focus on special use scenarios, such as vehicle evaporation emissions situation after refueling; finally, in order to promote the standardization of relevant testing, it is recommended to promote industry and local standards to standardize the working position of vehicles fuel tank cap pressure detection and fuel inlet pressure detection.

Key words: fuel evaporation system; leakage detection; fuel inlet pressure test; evaporation pollutant discharge test; fuel tank cap