车辆载荷和空调对重型车实际道路排放的影响

Effects of Vehicle Load and Air Conditioner on Real Driving Emissions of Heavy-duty Vehicle

本文选取了一辆国六排放水平的城市公交车,在高温条件下开展了不同车辆载荷和空调是否开启的整车车载法(PEMS)测试。结果表明:开启空调和增加车辆载荷都会增加PEMS测试的累积功。在空载和半载两种情况下,开启空调均会降低NO_(x)的排放。在不开空调的情况下,半载的NO_(x)排放要高于空载的NO_(x)排放。在开启空调的情况下,半载和空载的NO_(x)排放相差不大。增加车辆载荷或者开启空调都会造成PN排放的增加。对于该城市公交车,高温条件下开启空调有利于通过PEMS排放认证测试。

The effects of vehicle load and turning on air conditioner under high temperature on the portable emission measurement system(PEMS) emissions are investigated by conducting 4 different PEMS test for a heavy-duty city bus. Results show that turning on the air conditioner and increasing the vehicle loading will increase the cumulative work of the PEMS tests. In both no-loading and half-loading situations, turning on the air conditioner will reduce NO_(x) emissions. When turning off the air conditioner, NO_(x) emission of half-loading PEMS test is higher than that of no-loading PEMS test. When the air conditioner is turned on, there is little difference on the NO_(x) emission for half-loading and no-loading PEMS test. Increasing vehicle loading or turning on the air conditioner will cause an increase in particle number(PN)emissions. For this city bus, turning on the air conditioner under high temperature is conducive to passing the PEMS emission certification test.