符致勇，钟建伟

泛亚汽车技术中心有限公司，动力总成部

摘要：分析了汽油机排放闭环控制的基本原理，以及根据氧传感器电压信号进行的燃油修正的基本原理，阐明了短期燃油修正和长期燃油修正之间的关系，以及燃油修正诊断的基本逻辑。并针对燃油修正诊断故障进行了举例说明，对于燃油修正诊断的故障排查进行了一定的探讨。

关键词：燃油修正，诊断，闭环控制

Abstract: Gasoline engine uses closed loop as its basic emission control strategy, and this fuel control adjustment is based on O2 voltage signal. The long term fuel control is correlated with short term control. As to the fuel adjustment diagnostics, this paper also illustrates with some examples for the fault elimination.

Keywords: Fuel adjustment, diagnostics, closed loop control