Data Acquisition System Based On Can Bus Is Research And Development

With the development of modern automobile technology, electronic device 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 intellegentized and networked system was realized.In the thesis, the actuality and develop trend of vehicle electronic technology are introduced. Analysed in deeply the performance and characteristic of CAN(Controller Area Network) that are used widely in occidental auto at present. 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 orgnizing rules and particularly represents the message, frame format, error style and checking error ability in CAN Bus are simply introduced:CAN controller and transceiver were chose which are the key chips in the CAN communication.Here I propose a hardware and software design of a kind of data collection and monitoring system for vehicle base on CAN bus. The therories and applications of CAN controller SJA1000and transceiver PCA82C250were analyzed in detail.The system can work stably and reliably after debugging, it achieves the desired design requirements. The part of hardware is small size, low cost and the whole system is scalable. It can be applied to other network system based on CAN bus, to achieve the aim of monitoring the internal network and collecting data.