利用颗粒物数量测试仪器ELPI对瞬态循环下的汽油车和液化石油气汽车进行颗粒物排放测量.结果表明,两种车辆排放的颗粒物中,粒径小于70nm的颗粒物均占绝对优势,占总排放的80％～ 90％;大于490nm的颗粒物在总排放中的比例均非常小.且颗粒物数量排放浓度随着车速的升高而增加,尤其是车速超过70km/h后,颗粒物数量排放随车速的增幅升高.但两种车辆相对比较,汽油车排放的颗粒物数量比液化石油气汽车多.%The particulate matter (PM) emissions from both gasoline vehicle and liquefied petrol gas (LPG) vehicle in transient driving cycles are measured with electrical low-pressure impactor (ELPI).The results show that in two types of vehicles the majority,i.e.80％ to 90％ of PM have a size smaller than 70nm and only a very little proportion of PM are larger than 490nm.The PM number concentration of emission increases with the rise of vehicle speed,in particular,it grows more sharply when vehicle speed higher than 70km/h.But in comparison between two types of vehicles,the number of PM emitted from gasoline vehicle is more than that from LPG vehicle.
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