不同环境条件下轻型车RDE测试排放特性研究

The effect of different ambient temperatures and altitudes on the tailpipe emissions from the RDE test was measured on a China-6emission standard light-duty direct-injection gasoline vehicle. The results showed that the 30ºC ambient temperature increased the heat load on the after treatment devices compared to the 23ºC ambient temperature test, resulting in an increase in CO and PN emissions and a slight decrease in NO_x emissions from the test vehicle. It is found that at 30ºC, the increase in test altitude reduced the vehicle's road resistance requirements, which in turn reduced the frequency of fuel enrichment, resulting in a trend of decreasing CO and PN with increasing altitude. The results also show a relatively high sensitivity of CO and PN emissions in the urban phase to changes in RDE test boundary conditions, indicating that further refinement of the vehicle's emissions calibration is still necessary.