A hybrid electric bus (HEB) is tested for its particulate matter (PM) emission under Chinese City Bus Cycle (CCBC) by electrical low pressure impactor (ELPI). The test results show that PMs with a size smaller than 1.5 μm are dominant emission. In cruise mode, the number and mass concentrations of PM increase with the rise in vehicle speed, in particular, at high speed they sharply increase to be about 3 and 3.5 times higher respectively than those in idle mede. Among different working modes, both number and mass concentrations of PM in accelerating mede are at the peak. The mass emission factor of HEB under CCBC is 0.864g/km, 28.6％ lower than traditional State-Ⅲ diesel bus.%利用ELPI测量了一辆混合动力客车在我国典型城市公交循环(CCBC)工况下的颗粒物排放情况.试验结果表明,车辆排放的颗粒物主要分布在1.5μm以下;匀速工况颗粒物的粒数浓度和质量浓度随着车速的升高而明显增加,尤其是高速时增长更快,其粒数浓度和质量浓度分别约为怠速工况的3倍和3.5倍;在各种工况中,加速工况颗粒物的粒数浓度和质量浓度均最高;CCBC工况下,试验车辆的质量排放因子为0.864/km,比传统国Ⅲ柴油客车降低了28.6%.
展开▼
