The design of electric motor car´s body network based on CAN-bus distributed control

CAN-bus is a typical bus control technology, and is now widely applied in many areas.In view of the characteristics of the electric vehicle body, this paper puts forward a plan that applies CAN-bus technology to build electric vehicle body network. In terms of the electric vehicle body system, it needs to resolve several issues: One is to simplify electronic wiring harness as far as possible, and the other is to ensure the normal data communications. In this article, the body electrical is divided into different nodes in accordance with the principles of proximity, each node controls a certain area of electrical equipment, and at the same time, communicates with other nodes through CAN bus. CAN bus used SAE1939 agreement and defined message through this agreement. Each body node of the circuit includes main circuit board and extended board. The main circuit can achieve the requirements of data communications; the extended board can achieve the expansion of body electrical. The circuits are divided into several modules in application with circuit modular design approach. Every module was respectively developed by embedded software system through some software development tools, at the same time, tested the entire body CAN network communications systems. After the test, the entire body of communications network can meet the requirements.