An on-board emission testing platform is built, light and medium vehicles are chosen for conducting their emission test on real road, and a data base relating emission data to driving condition data is set up. A concept of vehicle specific power (VSP) is introduced, the relations of emission vs. VSP and emission vs. Vehicle speed are compared, and the distribution frequencies of VSP for two types of vehicles and the changing relation between the emissions of three pollutants and VSP is analyzed. The results show that the VSP of light and medium vehicles concentrate on the range of -3 ~7kW/t, and compared with vehicle speed, there is a more strong correlation between emissions and VSP of vehicles.%搭建车载排放测试试验平台,选择轻型车和中型车进行了实际道路排放测试,建立了排放数据与行驶工况数据对应的数据库.引入比功率的概念比较了机动车排放随比功率和速度的变化关系,分析了轻型车和中型车比功率的分布频率和3种污染物的排放随比功率的变化关系.结果表明,轻型车和中型车比功率集中在-3～7kW/t范围；和速度相比,机动车的排放与比功率有更强的相关性.
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