| 摘要:采用OBS-2200车载排放测试系统及ELPI电子低压冲击仪，对国Ⅴ公交车燃用不同比例生物柴油的实际道路排放特性进行了研究。燃料分别为国Ⅴ纯柴油及其与纯生物柴油按一定体积比例调和后的混合燃料。研究结果表明:实际道路排放随车速的跟随性良好，且基本随车速增大而增加。随着调和比例的升高，CO、THC排放降低，CO2、NOx排放升高。PN及PM排放均降低，PN对数数量浓度分布峰值区域由小粒径中高速范围向小粒径中低速范围移动，极低值区域由大粒径中低速范围扩大到大粒径全速范围；PM对数质量浓度分布呈双峰带分布，分别在0.1~0.2 μm及大于约6 μm的范围内，随调和比例升高，前者逐步缩小，后者由中高速范围移向中低速范围，但两波峰的粒径范围位置没有发生明显偏移。 |
| 关键词: 国Ⅴ公交车 生物柴油 实际道路 排放 |
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| Study on On-Road Emission Characteristics ofa China-V Bus Fueled with Biodiesel |
| Lou Diming,Zhu Gang,Hu Zhiyuan,Tan Piqiang |
| School of Automotive Studies, Tongji University, Shanghai 201804 |
| Abstract:On-road emission characteristics of a China-V diesel bus fueled with different proportions of biodiesel was studied by using OBS-2200 on board emission test system and electrical low pressure impactor(ELPI). The fuels were China-V pure diesel and blends of varied proportions of biodiesel with diesel. The research results show that on board emission has good following performance with the bus speed, and basically both emissions increase when bus speed increases. With the increasing of biodiesel content, CO and THC emissions decrease, but CO2 and NOx emissions increase. PN (particulate number) and PM (particulate mass) emissions both decrease as well. Meanwhile PN concentration peak moves from medium-light speed towards medium-low speed when the particle diameter is small. The lowest PN concentration appears when the particle diameter is large and covers the whole speed range instead of within the medium-low spead range. The size distribution of PM concentration is bimodal. One is between 0.1 and 0.2 μm, and the other is about larger than 6μm.When biodiesel mixture ratio increases, the first peak contracts and the latter moves from medium-light speed towards medium-low speed and the posts of both peaks do not move obviously. |
| Key words: China-V bus biodiesel on-road emission |
