obd简介及原理分析 在汽车故障诊断领域，针对诊断设备和汽车ECU之间的数据交换，各大汽车公司几乎都制订了相关的标准和协议。-obd Introduction and principles of analysis in the automotive fault diagnosis, diagnostic equipment and vehicle for data exchange between ECU, almost all the major car companies develo