机动车实用路况法的研究

提出1种检测在用轻型汽油车尾气排放的新方法——机动车实用路况法（Vehicle Road Available Method,VRAM）,它采用 AVL Digas4000五气分析仪测量尾气各成份浓度,根据具体车型设定充量系数和时间差等参数,所得计算结果与汽车排放总量分析系统（Vehicle Mass Analysis System,VMAS）测量结果具有良好的相关性。作为对该方法可行性的验证,将在用轻型汽油车分类后,选取6种代表性车型进行了试验验证。指出人为因素、环境因素对实用路况法（VRAM）的相关性影响较大,但成本和便利性上的优势使得这种方法仍具有极强的实用价值。

A Study on Vehicle Road Available Method

A new method called vehicle road available method(VRAM)for measuring in-use light gasoline vehicles' emission was introduced.By using AVL Digas4000,a five gas analyser,to measure exhaust emission, and by calibrating volumetric efficiency and time-delay according to vehicle types,an excellent correlation was revealed between VRAM's calculating results and vehicle mass analysis system(VMAS)measuring results.Six types of vehicles were measured in order to verify VRAM's feasibility.It has been indicated that artificial as well as environmental factors exerted a rather significant influence on the correlation with VRAM,however,its merits in cost and handiness made it still very practical.