闭环控制系统空燃比波动对三效催化剂活性的影响

通过对国外资料的考察分析，论述了空经波动对车用三效催化剂活性的影响，在催化剂与电喷发动机的匹配中，必须考虑催化剂的动态特性。对催化剂的动态性能和静态性能进行了试验对比，并针对不同幅值和频率的空燃比波动对催化剂性能的影响进行了试验研究。结果表明催化剂在动态的性能好于静态；随空燃比叔动幅值的增大，催化剂选择窗口变宽。

Effect of A/F Ratio Fluctuation in a Closed-loop Control System on Conversion Efficiency of Three-way Catalyst

Based on the review and analysis of foreign researches, the paper presented the effet of A/F ratio fluctuation on conversion efficiency of three way catalyst. The dynamic performance of catalyst must be evaluated when it is to match with engine. The difference between dynamic performance and static performance of catalyst is studied by test. And the effect of A/F ratio fluctuation with difference amplitude and frequency has been studied. The results show that dynamic performance of catalyst is better than static performance and the selection window will be widen when the amplitude of A/F ratio fluctuation is enlarged.