基于工况分布与测试的轻型车实际道路排放因子的求取

Calculation of Real Driving Emission Factors of Light-duty Vehicles Based on Distribution of Driving Conditions

基于27辆不同排放阶段的轻型汽油车实际道路排放试验结果,通过划分冷启动过程与热运行过程,结合中国工况中的VSPBin区间分布,计算了轻型车实际道路排放因子。结果表明:随着排放标准的趋严,轻型车实际道路的CO与NO_(x)排放呈现明显的下降趋势,同时PN排放在国Ⅵ阶段迅速下降;热运行过程中,在VSP较高的Bin25与Bin 37内,CO、NO_(x)与PN排放均较高;国Ⅵ轻型车CO、NO_(x)与PN热运行加权排放因子分别为0.133 g/km、0.019 g/km、2.67×10^(11)个/km;结合北京市机动车使用场景,计算表明国Ⅵ轻型车单日CO、NO_(x)与PN排放量最高可达12.47 g、1.47 g、2.60×10^(13)个/km;通过不同环境温度WLTC工况试验,得到了环境温度对污染物排放的影响系数,并加权计算了不同环境温度下的排放因子。

Based on the real driving emission test results of 27 light gasoline vehicles meeting different emission stages,the real driving emission factors of light vehicles are calculated by dividing the cold start process and hot running process,combined with the VSP Bin interval distribution in CLTC cycle.The results show that with the tightening of emission standards,the CO and NO_(x) emissions of light vehicles show an obvious downward trend,and the PN emission decreases rapidly in the China VI stage.During hot running,the emissions of CO,NO_(x) and PN are higher in Bin 25 and Bin 37 with higher VSP.The hot running weighted emission factors of CO,NO_(x) and PN of China VI light vehicles are 0.133g/km,0.019g/km and 2.67×10^(11)/km respectively.According to the calculation of vehicle usage scenarios in Beijing,the daily emissions of CO,NO_(x) and PN of China VI light vehicles can reach 12.47g,1.47g and 2.60×10^(13)/km respectively.Through the WLTC test of different ambient temperatures,the influence factors of ambient temperature on pollutant emission are obtained,and the emission factors under different ambient temperatures are calculated.