【摘要】 论述国家颁布的在用汽油车排放标准中简易瞬态工况法(Vm as系统)的测试原理和测量系统组成,分别采用不同的底盘测功机、不同的测试模式进行试验,分析了影响Vm as测量汽车排气污染物准确度的因素。在进行大量试验的基础上,提出了为提高测量准确度和重复性,车辆在试验前应进行必要的预处理,使用电涡流测功机应该附加机械飞轮。更多还原

【Abstract】 The principle and constitution of the short transient driving cycle testing system are discussed.A series of tests are carried out with different chassis dynamometers and testing modes to analyze the main factors affecting test accuracy.On the base of these tests,a suggestion is put forward that necessary pretreatment should be done on vehicle before testing and an additional mechanical flywheel should be added for improving the accuracy and repeatability of testing when eddy dynamometer is used.更多还原