机动车PM2．5排放特性

为了获得典型机动车PM2．5排放特性，文章利用符合PMP规程的MEXA一1000SPCS时不同技术类型的机动车进行了PM2．5数量排放研究，并对PM2．5排放较高的两类车型（GDI和国Ⅳ柴油车）进行了冷热试验对比。试验结果表明：不同技术类型机动车PM2．5排放量级差异明显，国V柴油车〈MPI汽油车〈GDI汽油车〈国Ⅳ柴油车；GDI汽油车PM2．5排放受温度影响要大于受负荷的影响；国Ⅳ柴油车型PM2．5排放受车辆负荷的影响要大于受温度的影响；DPF技术能够有效降低PM2．5排放；无论何种车型，瞬态加速工况都会造成PM2．5排放急剧增高。

Study on PM2.5 Emission of Motor Vehicle

In order to ubtain the typical performance of PM2.5 emission, using the PMP procedures MEXA-1000SPCS to do the test of PM2.5 emission to the motor vehicle, and two models of higher PM2.5 emissions （GSI and the State IV diesel vehieles） to do the contrast test on cold and hot starting is described in this paper. The results showed that adopting different type technologies to test PM2.5 emission is significantly different, the State V diesel vehicle 〈MPI gasoline vehicle〈GDl vehicle 〈 State Ⅳ diesel vehicle. PM2.5 emission of GDI vehicle affected by temperature is greater than by the load. PM2.5 emission of the Stale IV diesel vehicle affected by load is greater than the impact of the temperature. DPF technology can effectively reduce PM2.5 emissions. PM2.5 emission can increase sharply under transient acceleration conditions whatever the different vehicle types may be.