Laboratory emission tests are conducted on six vehicles ( four gasoline vehicles and two diesel ve-hicles) meeting state-IV and state-V regulation respectively with WLTC and NEDC cycles, and real driving emission ( RDE) tests are also performed on four of them according to corresponding specifications. The results show that un-der real road driving conditions, the CO emissions of gasoline vehicles and the NOx emissions of diesel vehicles seri-ously exceed regulation limits, in which high emissions mainly appear on suburban road and highway where vehicle speed usually higher than 60 km/h, and instantaneous emissions increase with the rise of vehicle speed and acceler-ation. Some gasoline vehicles show rather high CO emission with WLTC cycle at ultra high speed section while their THC emissions with WLTC cycle are lower than that with NEDC cycle. The PN emissions of four gasoline vehicles with WLTC cycle and NEDC cycle all exceed regulation limit, while the PN emission of two diesel vehicle and the PM emissions of all vehicles are lower than regulation limits. So it is suggested that in the development of state-VI vehicles, attentions should be focused on the CO and PN emissions of gasoline vehicles and the NOx emission of diesel vehicles.%选择6辆满足国Ⅳ、国Ⅴ排放标准的轻型汽油车和柴油车进行了在WLTC和NEDC循环工况下的试验室排放试验,并对其中的4辆车按照RDE测试规程进行了实际道路排放测试.结果表明:在实际道路行驶条件下,汽油车CO和柴油车NOx排放严重超过标准限值,高排放主要出现在车速大于60km/h的郊区和高速公路段,瞬时排放量会随着车速和加速度的升高而增大;部分汽油车在WLTC工况的超高速段中出现了很高的CO排放,而WLTC工况THC的排放则小于NEDC工况;4辆汽油车在NEDC工况和WLTC工况下PN排放都超过标准限值,而柴油车的PN排放和所有车辆的PM排放都小于标准限值.建议国Ⅵ车型开发时应重点关注汽油车的CO,PN排放以及柴油车的NOx排放.
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