基于ASM（稳态工况法）在用汽油车NOx排放特性研究

环境保护是当前汽车发展的最重要的问题之一，ASM的实行有利于减少汽车对大气的污染，特别是对NOx排放的严格监控。文章选取近10万辆车测试结果进行研究，研究表明汽油车的NOx不合格率高于HC和CO，特别是10年以上的车NOx排放不合格率高达36％；汽油车NOx排放随着车龄的增加而增加，且7年以上开始快速增加；汽车排量对NOx排放影响较小，而不同品牌的车NOx排放相差可能较为明显；测试过程中测试工况对排放的影响较小。

Research on NOx Emission Characteristics of Gasoline Cars Based on ASM Method

Environmental protection is one of the most important issues in current automotive development. The implementa- tion of ASM, especially the strict monitoring of the Nox emissions, helps to reduce automobile pollution of the atmosphere. This paper studies test results of nearly 100,000 vehicles. The results have shown that unqualified rate of NO, of gasoline cars is higher than that of HC and CO. Especially the unqualified rate of the NOx of cars which are more than 10 years old is up to 36%. The NOx emission of gasoline cars increases with cars＇age and the emission＇s speed of increases accelerates when the car is over 7 years old. This paper also identifies that cars＇engine output has a small affect on cars＇ NO, emission, whereas the difference of NOx emission of different car brands is rather apparent. During the test, this paper finds that the test conditions has a small influence over NOx emission.