The Research On Automobile Electronic Products Malfunction Auto-Detect System Based On CAN-bus

CAN industrial LAN also called controller LAN, it belongs to the scope of Field bus, which is a high-speed, reliable, and low-cost serial bus to the real-time control applications. it was widely used in distributed processing system and real-time control industrial applications system. An applications plan of CAN-bus was achieved in automotive electronics testing in this article, which was versatile, programmable, maintaining, upgrading and expansion of intelligent.The detection stage must be done in the production of electronic products. With the advancement of technology, the development of electronic products was rapid. Circuit has been in the process of small endlessly. Since the surface mount technology (SMT) replaced jack-mount technology gradually, devices installed in circuit boards have been getting smaller and smaller, the function of board has been getting stronger and stronger, the detection was also much harder and harder. So were automotive electronics, and the safety of automotive electronics products made the detection process much more important.A kind of auto-detect method is proposed based on the circuit function according to the characteristics of automotive electronics in this article, which detect each function module of the PCB through its I/O port. It combines the managers and the detected positions to a network with CAN Bus and integrated the detection into the production of management. This article mainly completed the following works:1. The CAN Bus is built up based on detection system. A full CAN application layer protocol and a full detection information standard were formulated. Considering the system has plentiful data being transferred, a Multi-frame method is adopted to ensure all CAN points transmitting data to the supervising computer accurately and effectively.2. Depending on the application needs, CAN points electric circuits are designed. The hardware matching and debugging of each functional module were completed.3. The software was designed and debugged based on the hardware circuit, which made the detected position to download program to the PCB automatically, and measured in accordance with the circuit board with the order of the functional modules finished the detection tasks automatically. At the same time, the CAN communication software has been designed to achieve the data transmission on network.