国V公交车实际道路排放特性研究  

A Research on the Real World Emission Characteristics of State-V Buses

作　　者：郭佳栋[1] 葛蕴珊[1] 谭建伟[1] 张学敏[2] 余林啸[1] 付明亮[1] 

机构地区：[1]北京理工大学汽车动力性与排放测试国家专业实验室,北京100081 [2]中国农业大学工学院,北京100193

出　　处：《汽车工程》2015年第1期120-124,共5页Automotive Engineering

基　　金：国家自然科学基金(51276021)资助

摘　　要：使用车载排放测试系统测试了北京市4种不同技术路线的14辆国V车辆的实际道路排放情况。结果表明,氧化催化器(DOC)能明显降低天然气公交车的CO排放,但其对THC的降排效果有待提高。采用EGR技术的天然气公交车在低速时NOx减排效果较柴油车好,但是高速时没有优势。使用SCR系统的柴油车CO和THC排放较低,但低速时NOx排放较高。而天然气车由于排气温度较高,加装SCR系统后可有效降低NOx排放,效果最理想。天然气公交车的颗粒物质量排放远低于柴油车,但是由于稀释方式的影响,其核模态的颗粒物数量较多。The real world emissions from 14 State-V buses with four different after-treatment technologies are measured with portable emission measurement system. The results show that diesel oxidation catalyst can appar-ently reduce the CO emission of CNG-fueled buses, but its effect of reducing THC emission need to be improved. The CNG-fueled buses adopting EGR technology have a better emission reduction effects than diesel buses at low speed but there is no superiority at high speeds. The diesel buses with SCR system have lower CO and THC emis-sions but their NOx emissions are relatively high at low speeds, while the CNG-fueled buses with SCR system can ef-fectively reduce NOx emission due to higher exhaust temperature, being the most ideal choice. The particulate mat-ter mass emissions of CNG-fueled buses are far lower than diesel buses, but due to the effects of the way of dilution they emit more particles in nucleation mode.

关 键 词：公交车 柴油机 天然气 实际道路排放 后处理系统 

分 类 号：U467.48[机械工程—车辆工程]