国六柴油机PN排放试验研究

Study on PN Emission of CHINAⅥDiesel Engine

为探究国六柴油机开式排放循环中PN排放的影响因素,本文以某国六轻型柴油机为研究对象,研究不同漏气量下WHTC开式排放循环中PN排放量级,以及开式循环管路加热装置、冷态WHTC试验前的不同凉车时间、呼吸器内部毛毡结构等参数条件对排放循环PN尾排的影响。研究结果表明:(1)柴油机本体漏气量对开式PN排放的影响较显著;而呼吸器内部毛毡结构对开式PN排放影响较小;(2)开式循环下,开式管路的加热装置对冷态WHTC的PN排放的影响较显著;而对热态WHTC的PN排放影响较小;(3)开式冷态WHTC试验前凉车时间的增加,会导致冷态WHTC的PN排放增加。

In order to explore the factors affecting PN emissions in the open emission cycle of CHINAⅥdiesel engines,the study of CHINAⅥdiesel engines examine the difference in PN emissions in the WHTC open emission cycle at different blow-by volumes,as well as the effect of parameter conditions such as open loop line heating,different cold cycle times before cold-running WHTC testing,and the internal felt structure of the respirator on the PN emissions of the WHTC cycle.The results of the research show that:①The impact of the gas leakage of the diesel engine is significant for the open cycle PN emissions;The effect of the discharge of the split PN of the felt structure inside the respirator is small;②The heating of open lines has a significant impact on PN emissions of cold-running WHTC,while the PN emissions of hot WHTC are less affected;③As the cooling time increases before the cold-running WHTC test,it can lead to an increase in PN emissions from the cold-state WHTC.