Emission characteristics of light duty vehicle in RDE tests under different environmental conditions
WANG Xin1, GE Yun-shan1, JIANG Ping2, WANG Xian-gang2, ZENG Jun2, GU Dong-lin2, XU Chang-jian2, LI Jia-chen1
1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081; 2. Chongqing Chang-an Automobile Company Limited, Chongqing 400023
Abstract:The effect of different ambient temperatures and altitudes on the tailpipe emissions from the RDE test was measured on a China-6emission standardlight-duty direct-injection gasoline vehicle. The results showed that the 30ºC ambient temperature increased the heat load on the aftertreatment devices compared to the 23ºC ambient temperature test, resulting in an increase in CO and PN emissions and a slight decrease in NOx 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 testboundary conditions, indicating that further refinement of the vehicle's emissions calibration is still necessary.
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