Research And Design Of CAN Bus Network Architecture For Electric Vehicle

Electronic control technology is one of the key technologies of electric vehicle,in addition to original automobile electronic technology in the traditional ICE vehicle,such as ABS, air bags, etc., pure electric vehicle also develop electronic units such asbattery management unit, etc. according to its own characteristics. Along with theincrease in electronic control systems, the requirement of the cooperation andreliability between the systems are also increased, the CAN-bus communicationtechnology can effectively solve this problem, it can not only realize data sharing, butalso improve the reliability and real-time performance of data transmission.This paper researches on CAN network structure of the pure vehicle in terms ofits CAN network as a whole. First of all, according to the characteristics of a pureelectric vehicle and real-time and function requirements of a CAN bus network,researches and designs of the vehicle CAN bus network architecture, which containstwo sub networks: one is high-speed CAN sub network, it includes motor control unitetc., the other is low-speed CAN sub network, it includes the body comfortablesystem and the instrument controller which is taked as a gateway, and determines thecommunication process and content between network nodes. Then based on the J1939protocol, designs CAN network communication protocols, in which the applicationlayer protocol is the key, it includes the priority assignment, source addressdistribution, parameter definition etc. Then, establishes the CAN network simulationmodel using the CANoe, which provides a basis for the validation for the CANcommunication protocol. Finally, analyses the real-time performance through theRMA method, and make a test for the CAN network by using the model simulation.Results from the analysis for the CAN network show that the CAN networkstructure and communication protocol designed for the electric vehicle meet thecommunication requirements, have good real-time performance. This paper design theCAN network based on J1939protocol for a pure electric vehicle, and achieved goodeffect, which states that it has the very good project application significance.