环境温度对轻型汽车工况法排放测试结果的影响

通过实际试验得到验证,提出了环境温度对汽车工况法排放试验中各污染物的影响趋势及相关性分析；环境温度对CO和HC的影响较为明显,在冷启动阶段排放量随环境温度的升高而有较明显的改善,至IⅡ部循环时,环境温度对其影响不大；NOx排放量在汽车冷启动阶段受环境温度影响不大,仅当高温排气时,NOx会急剧增加,温度控制点在27～28℃时,对工况法排放中NOx排放量也有稍微改善.

Effect of Environmental Temperature on the Testing Result of Exhaust Pollutants Measured under the Driving Mode Conditions

By actual test validation,the impact and correlation analysis between environmental temperature and various exhaust pollutants which measured under the driving mode conditions have been proposed.The results showed that effect of environmental temperature on the CO and HC is more obvious.During the cold start phase,with increase in the environmental temperature CO and HC emissions have a more significant improvement.To part II loop,there is little effect of environmental temperature on CO and HC emissions.In vehicle cold start phase,NO_X emissions are not affected by the ambient temperature.Only when the exhaust temperature is high,NOx increased dramatically.When control temperature at 27～28 ℃,NO_X emissions under driving mode conditions would slightly reducing.