The Research Of Automobile Electric Control Bus Technology Based On CAN/LIN Mixed Protocol

The traditional automobile electrical control system used in peer-to-peer communications, the freetly increased electronic level of automobiel makes the wiring harness more complicated by which not only increases costs, but also lower the reliability of system because of the various nodes. Bus network can decrease the number of the control lines and increase the reliability greatly. Therefore, the bus control application will be an inevitable trend in the automobile electrical control system. How to build the automobile electronic control system based on bus control technology, becomes a widely attent hotspot in the automotive electronics field. Siemens has been completed CAN bus control system using PLC technology. Due to its many advantages,such as strong anti-interference, line simplification, high speed transmission, can arbitrarily expand the system and etc. it has been a high degree of attention at home and abroad, but it costs high, many domestic auto production manufacturers can't accept.In such circumstances, Fuzhou JK Yaming Electric Co., Ltd. (Shenyang Zhongshungaiche suppliers) cooperate the electronic laboratory of Electrical and Mechanical Engineering Department of Xiamen University, jointly developed automobile electrical control system based on CAN bus - "JKCAN-01 automobile CAN bus ".The project is funded by the Fujian Provincial Economic and Trade Commission.This thesis is based on the "JKCAN-01 automobile CAN Bus" project. After researching and comparing various bus technology, the topic "The research of automobile electric control bus technology based on CAN/LIN mixed agreement" is choosed. On the basis of automobile electrical control system run reliably and in realtime, the automobile communication networks using the CAN bus, and LIN Bus technology can realize the bus control of automobile electrical system. It can reduce the cost from production, installation and maintenance, system usage and etc.The main work of the subject is: By comparing various field bus technology, considering automobile electrical control system its own situation, we establish the automobile electrical control system method based on CAN/LIN mixed network, discuss the system's design goals,function and main structure; Introduce CAN2.0B bus and LIN1.2 bus basic theory and protocol. Design the hardware circuit based on CAN2.0B bus and LIN1.2 bus protocol strictly including CAN node circuit design, LIN node circuit design and CAN/LIN gateway circuit design. The chips used in the circuit design and their performance are also introduced detailedly; In the end, various system software are designed and the main flow chart are given.When completing of the design work, the whole system was debugged on the lights control platform in the laboratory. The main performance of the entire communications network was tested and analysed. In debugging process, improved and optimized the system hardware and software constantly.After that, loaded all the node modules and tested in the Zhongshun century SZS6503 automobile. The control effort was good from the operating results. It had a good real-time ability and reliability.CAN bus and LIN bus technology are emerging in the automobile industrial communications network. The research of them is still in the initial stage in China. Therefore, both from development trend of automobile modularization, and from its own maneuverability, the CAN/LIN bus has a good prospect in the field of Automotive Electronics...