尾气净化装置的检测必须在工况状态下进行，但现在的工况测试需要进行台架试验，价格少则五、六十万，多则几百、上千万，做一次尾气净化装置的检测花费也很大。很多生产、研究单位没有能力经常性对产品进行测试。由于汽车尾的轻便特点，可用于汽车实际道路行驶状况的检测，简单方便地反映出汽车在不同负荷、不同道路中的尾气基本排放情况。而花费只是几万元仪器的一次性投资。
The detection of the tail gas purification device must be carried out under the working condition, but the current working condition test needs to be carried out on the bench test, the price is less than 50000, 600000, and more than a few hundred, tens of millions, and the cost of a detection of the tail gas purification device is also large. Many production and research units do not have the ability to test products regularly. Due to the light characteristics of the car tail, it can be used to detect the actual driving conditions of the car on the road, and simply and conveniently reflect the basic exhaust emissions of the car in different loads and different roads. The cost is only a one-off investment of tens of thousands of yuan.