一提起汽车诊断，很多人的脑海里往往蹦出来的是和OBD故障代码相关的狭义诊断，甚至仅**于排放监测相关的“OBD”故障诊断。其实这对于汽车诊断的理解难免有些片面。

厦门万向兴自动化设备有限公司

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　　OBD是英文On-BoardDiagnostics的缩写，意为“车载自动诊断系统”。这个系统将对发动机、自动变速箱等汽车电子系统的运行状况实时监控，一旦系统发生故障，会发出相应的故障代码，比如汽车尾气排放系统的三元催化器失效，导致尾气超标，一旦发生，系统会马上发出警示。

　　*早的时候，OBD是欧美国家为监测汽车尾气排放而开发的。由于汽车的普及，为了应对环境污染机动车排放标准不断升级，从而促进了发动机电控系统的普及。为了方便汽车公司在整车生产制造和售后维修时对发动机电控系统进行检测，以及汽车相关管理部门对车辆状态进行法规监测，汽车公司和发动机电控系统供应商联合制定了标准的物理接口和通讯协议，我们称之为OBDI。

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