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1977年,美国通用公司采用 MISAR 即最早的车内诊断系统,直到八十年代,已成为故障诊断的主流。但在最近,几经匿迹的车外诊断系统又重新以新貌问世,它能根据诊断软件作出故障判断。其特征是既利用了自诊功能,又借重于外部讯息网络。汽车厂和销售商、保修厂之间也建立了密切的联系,数据库内储量和使用率都得到了极大的丰富和提高。但还有待于软件的充实、功能的扩充和标准化的推进。
In 1977, General Motors Corporation of America adopted MISAR, the earliest in-vehicle diagnostic system, until the eighties, becoming the mainstream of fault diagnosis. Recently, however, several out-of-vehicle diagnostic systems that have disappeared from the scene were again appearing in new looks. They can make fault judgments based on diagnostic software. Its characteristic is not only the use of self-diagnosis function, but also rely on external information network. Automobile factories and vendors, warranty factories have also established close ties between the database reserves and utilization have been greatly enriched and improved. But still need to be full of software, functional expansion and standardization.