Study On CAN-Bus Based Control System In Vehicle Body

With the rapid development of the modern automobiles technology, the electronic devices in vehicle body are increasing continuously. The traditional wiring harnesses can not satisfy complex functions of control systems of automobiles. As the CAN bus introduced into vehicle control system, great progress has taken place in the area of vehicle electron. By adopting CAN bus, the function of vehicle body control system was satisfied perfectly, the cost was decreased, the redundant wiring harnesses were cut down, the intelligentized and networked system was realized.First of all, this paper analyzed the developing trend of international automotive network technology and considering its application and development status in China. The basic topology and working theory of the vehicle body control system based on the CAN bus is introduced. Technical regulation of CAN Bus network is lucubrated and Data Link Layer and Physical Layer in hierarchy structure of CAN Bus is described. Its basic concept and organizing rules and particularly represents the message, frame format, error style and checking error ability in CAN Bus are simply introduced.Second, CAN controller and transceiver were chosen which are the key chips in the CAN communication. The SJA1000 which is a stand-alone controller for the controller area network used within automotive and general industrial environments was chosen as a ideal communication controller. The PCA82C250 was selected as the interface between protocol controller and physical bus. The theories and applications of CAN controller SJA1000 and transceiver PCA82C250 were analyzed in detail.Two types vehicle body control schemes based CAN bus were brought forward in this paper. The topological structure charts of them were given correspondly. After analyzed and contrasted, the one with practicality and low cost was chosen. At the same time, the structures of subsystems were designed and their functions were expounded.Following, the paper analyses and discusses the issues of hardware and software design in the vehicle body control system. The hardware and soft were exploited by means of universal modularized method. Under the condition of ensuring the function commands, the processes of hardware and software designing were simplified, developed periods was shorten and the cost of system was decreased. In order to improve the stability and reliability of the electronic control system under severe electromagnetic interference environments, electromagnetic interference proofing and...