【摘要】 汽车电控系统出现故障时,必须将电控系统的故障信息(故障代码、状态信息、输入与输出信息)传送给解码器或计算机,供维修时参考。因此,在设计解码器或使OBD-Ⅱ与外部计算机实现网络通信时,除应满足诊断功能的需要外,还必须满足网络通信协议的规定。介绍了电控汽车自诊断系统通信网络的基本设计原理,OBD-Ⅱ与外部诊断计算机的连接。更多还原

【Abstract】 When the automobile electronic control sy stem goes wrong,failure information,such as failure codes,status information ,input and output information,of the electronic control system must be trans ferred to the decoder or the comput-er to give reference for service.Therefor e,except for diagnosis functions,decoders must meet the network communication protocols.The basic design principle of self-diagnosis system communication n etworks of electronical controlled automo-bile s and connection between the OB D-Ⅱand the external diagnosing computer are introduced.更多还原