山路行驶的柴油车污染物排放特性试验

Tests of exhaust emission characteristics for diesel vehicles driving on the mountain road

在山路和平路上,进行了不同载荷下国V柴油车的实际道路行驶排放(RDE)试验。采集车速、海拔、氮氧化物(NO_(x))和颗粒物数量(PN)排放浓度等数据,分析了道路坡度、车辆载荷与输出功率对排放的影响。研究发现:测试柴油车辆,在平均坡度约6%山路行驶时NO_(x)排放因子高于平路20%以上,PN低于平路20%以上。道路坡度自0增大到8%,NO_(x)排放浓度升高1倍以上,PN排放浓度升高20%~60%;坡度进一步增大,NO_(x)与PN排放浓度上升变缓,继而下降。载荷增大,NO_(x)与PN排放浓度升高;NOx、PN排放速率在10~40 kW功率区较大;NOx与PN高排放速率区随载荷增大变宽。该成果可为RDE测试车辆运行条件的设置提供参考。

Reality driving emission(RDE)tests were carried out on loads in mountains and plains for diesel vehicles of the CHINA Phase V.The data of speed,altitude,NO_(x) and PN emission concentration,etc.were collected to investigate the influence of the slope of mountain road,the vehicle mass loads and the output power on NO_(x) and PN emissions of diesel vehicles.The results show that NO_(x) emission factors on mountain road with an average slope of about 6%are 20%at least higher than that on flat road,and PN emission factors are 20%at least lower than that on flat road.With the increased of gradient from 0 to 8%,NO_(x) emission concentrations increased by more than 1 times,and PN emission concentrations increased by 20%-60%.As the gradient increases further,NO_(x) and PN emission concentration increases slowly and then decreases.When the load increased,NO_(x) and PN emission concentrations increase.The emission rates of NO_(x) and PN are high in 10-40 kW region,and the high emission regions of NO_(x) and PN become wider with increased of load.The results can provide a reference for the setting of vehicle operating conditions for RDE test.