混合动力轿车和汽油轿车的市区排放对比研究

Emission Research of a Hybrid Electric Car and a Gasoline Car on City Roads

基于车载排放测试技术,对混合动力轿车和汽油轿车在城市主干道行驶工况下的尾气排放进行了测试试验,并对比分析了试验车辆的排放特征。结果表明:在城市主干道条件下,由于混合动力轿车采用起动-停止控制模式,发动机工作时间较短,电动机在大负荷工况参与驱动来减小发动机负荷,HC总排放因子降低了48%,同时发动机燃烧室的温度大幅度降低,NOx总排放因子下降了86.7%;但是在城市主干道上进行频繁的停车再起动时,由于可燃混合气过浓,导致严重的不完全燃烧,全路段的CO总排放因子并无明显改善。

Based on the Portable Emission Measurement System（PEMS）, this paper carries out emission ex- periments of a hybrid electric car and a gasoline ear on city roads. Then the paper analyzes the emission characteristics of them. The study shows that the start-stop control mode on city roads shortens the en- gine＇s operating time;the motor works together with the engine to reduce the engine peak load;and then the HC emission factor decreases by 48% as a result;the engine temperature is low,which reduces the NOx emission factor by 86.7%;when the engine starts after stopping,the ignitable mixture is thick,which leads to serious incomplete combustion ~ the CO emission factor doesn＇t decrease obviously.