基于车载排放法商用车排放影响因素研究

为研究商用车实际道路排放试验的影响因素,基于便携式排放测量系统(portable emission measurement system,PEMS)测试技术,进行多组车载排放试验。通过试验数据定性分析试验工况、整车速比、整车载荷、试验海拔等对整车PEMS测试结果的影响。研究表明,整车变速箱、后桥配置存在最佳速比匹配区间,稳定的驾驶工况有利于整车排放,高海拔地区排放变差,且高负荷工况恶化严重,整车载荷、空气湿度与排放结果呈负相关。并从排放检测试验过程、整车配置、整车ECU数据等方面对试验数据进行分析,确定试验条件变化影响整车后处理转化效率和发动机燃烧性能,导致发动机排放性能变化。

Analysis of influencing factors of commercial vehicle emission based on PEMS

In order to study the influencing factors of actual road emission tests of commercial vehicles,multi-group vehicle-mounted emission tests are conducted based on portable emission measurement system(PEMS)testing technology.According to the test data,the influence of test conditions,the speed ratio of the rear axle of the gearbox,the load of the vehicle and the altitude of the test on the PEMS test results of the vehicle is analyzed qualitatively.The results show that factors have different effects on the PEMS test results.And vehicle load,air humidity and emission results are negatively correlated.According to the analysis results of the test data of the emission test process,vehicle configuration and ECU data of the vehicle,it is determined that the change of test conditions affects the post-treatment conversion efficiency and engine combustion performance of the vehicle,resulting in the change of engine emission performance.