何小明 陈领平 陈龙 洪伟春  

    摘要：本文分析了电喷系统的下游氧传感器从稀到浓响应慢的特性及其带来的影响，阐述了产生这种现象的中毒原因和机理，选择具有可行性强、可靠性高的方案，同时借鉴催化器怠速插入试验的特性，设计了下游氧传感器从稀到浓响应慢故障的插入诊断逻辑，最后进行了试验验证，提高了OBD系统的完整性。

    关键词：下游氧传感器，中毒， 响应，诊断，插入试验

    Abstract：The paper analyzes the characteristic that the downstream oxygen sensor slowly response to lean to rich mixture and its influence and describes the reasons leading such phenomenon, selects  a highly  feasible and reliable plan, design and validate a new interrupting diagnostic logic on lean to rich slow response for the downstream oxygen sensor. This improves the integrality of OBD system.

    Key Words: Downstream Oxygen Sensor；Poisoning；Response；Diagnosis；

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