Analysis And Research Of Vehicle Network System Fault Diagnosis

Vehicle network systems technology is the development of automotiveelectronics latest achievements, but also constantly evolving. Different manufacturers,different models equipped with on-board network systems vary, many networksystem bus technology type. Appear vehicle network system has many advantages forautomotive development for: The various electronic devices via the bus and thedevices on the vehicle connected to a network to share information between eachother, Greatly reduce and optimize the automotive electronic control sensors andactuators number and configuration, greatly reducing and optimizing the number andlayout of automotive wiring harness, But also to better control and coordination of thevarious systems of the car, making the car achieve the best performance. However, forthe maintenance of automotive after-market service diagnostic technology putforward higher requirements, increasing the difficulty factor and workload. Currentlyvehicle network system on the car is more common CAN bus, LIN bus, Flex Ray bus,MOST bus, Blue tooth bus, These five bus technology, while there will be differences,but the basic structure and working principle is a certain commonality, including themaintenance of the technical aspects of diagnosis is also similar.Through three years to teach yourself "automotive network systemsTroubleshooting" teaching practice of this course, these are five of the more commonautomotive network bus technology to summarize and organize comb, from conceptand each bus technology in cars on the specific application, analyzes finishing CANbus, LIN bus structure, Flex Ray bus, MOST bus, Blue tooth bus these five bustechnology, working principles and diagnostic technology, and strive to the mostdirect and important knowledge to show out, the most practical experience intechnology exchange and sharing it. And finally I analyzed and summarized aboutautomotive network systems troubleshooting cases during I Practiced in Bo RuixiangChi Benz4S of Beijing Automobile Repair Company, While the use of theirknowledge and experience system by means of vehicle maintenance technicianexperience helping business line technology, fault diagnosis model which wasestablished five bus technology, and with a typical case of the CAN bus fault "enginedoes not start and instrumentation ABS, ESP, ABC and many other warning lightsalarm "for example, the establishment of a specific fault tree theoretical model tocalculate the probability of the top events on this failure and minimal cut setsimportance degree. Bosch read the actual fault waveform740are all covered in thisarticle.I am learning the true fault waveform of the detected when training inGermany, after a lot of practical experiments sorted out. Through their sorting andreflection, I hope to give technical personnel and staff in the automotive repairservices market to be helped in-vehicle network system fault diagnosis andtroubleshooting work, improve quickness and accuracy of fault diagnosis on-boardnetwork system.