轻型柴油车实际行驶排放特性的研究

摘要

The real driving emissions from two diesel vehicles meeting Euro-Ⅳ and Euro-Ⅵ emission regu-lations respectively are measured using portable emission measurement system in accordance with real driving emis-sions ( RDE) procedure newly formulated by EU. The results show that the NOx emission factors of two vehicles with RDE procedure are 6. 8~7. 7 times as high as those with laboratory certification cycle NEDC, and the NOx conformi-ty factors (0. 71~7. 09) with NEDC, FTP75 and WLTC cycles and RDE procedure are all larger than those of CO (0. 11~0. 63). The instantaneous emission rate of NOx rises with the increase of vehicle acceleration and under the suburban and motorway conditions, peaks in instantaneous emission rate of NOx appear whenever vehicle accelera-tion exceeds the maximum acceleration in NEDC cycle. Accordingly particular attentions should be paid on the NOx emission of light-duty diesel vehicles in formulating RDE regulation.%根据欧盟最新制定的实际行驶排放RDE试验规程,使用便携式车载排放测试系统对两辆分别满足欧Ⅳ和欧Ⅵ排放标准的柴油轿车进行了实际行驶排放试验.结果表明:车辆RDE试验NOx排放因子是实验室认证循环NEDC的6.8~7.7倍,且NEDC,FTP75与WLTC循环和RDE试验中的NOx符合性因子(0.71~7.09)均大于CO符合性因子(0.11~0.63);NOx瞬时排放率随加速度的增大而升高;市郊和高速公路工况下,NOx瞬时排放率在车辆加速度超过NEDC循环工况的最大加速度时达到峰值.因此在制定RDE法规时,应重点关注轻型柴油车的NOx排放.