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| On-road Emission Characteristics of Gaseous Pollutants from Low-speed Vehicles |
| YAO Zhiliang1, SHEN Xianbao2, ZHANG Yingzhi2, WANG Qidong2 |
| 1. School of Food and Chemical Engineering, Beijing Technology and Business University, Beijing 100048, China;2. School of Environment, Tsinghua University, Beijing 100084, China |
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Abstract: On-road emission tests were conducted for six low-speed vehicles using SEMTECH-DS, a Portable Emission Measurement System (PEMS). The instantaneous speed and emission concentration data of CO2, CO, NOx and HC were collected, and the relationship between the driving cycle and emission, and the emission factors are analyzed based on the testing data. The results show that the emission factors of CO2, CO, NOx and HC decrease with the increase of speed and increase with the increase of acceleration; the emission rates are the highest in the acceleration mode, followed by the cruising mode, and are the lowest in the idling mode. The emission rates of the four pollutants for low-speed vehicles have a very good correlation with VSP; the average emission factors of the CO2, CO, NOx and HC for tested low-speed vehicles are 110.1, 1.66, 1.78 and 0.49g·km-1, respectively. The CO emission factors are comparable to the regulated values of light-duty diesel trucks with Nation II technology; and NOx and HC emission factors are comparable to the regulated values of light-duty diesel trucks with Nation I technology.
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Received: 21 February 2011
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2011, Vol. 29 
