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The electric vehicles fusion many of the electronic control system, such as a battery management system, the motor control system, the drive control system, the regenerative braking system and the ABS system. On the large number of applications in the electronic equipment and control of real-time requirements, will inevitably lead to the growth of body wiring and complicated series of shortcomings, the introduction of electric vehicles bus technology can overcome these shortcomings, has become a pure electric vehicle market trends. SAE-J1939 protocol based CAN2.0B core vehicle network serial communication and control protocol, a communication protocol is widely used in the current large vehicles. Need for the development of pure electric vehicle network communication, SAE-J1939 protocol specific application to the present has been developed out of a pure electric vehicle CAN bus design a vehicle network system architecture, the preparation of specific communication protocol specification, and the preparation of a central control unit, battery management unit, the unit of the drive system and air conditioning system software unit control functions and information communication functions FBI testing software, and finally the node unit related nodes collecting the information displayed on the LCD touchscreen. This paper first introduces the SAE-J1939 protocol origin, country, inside and outside its current research and application prospects. SAE-J1939 protocol network hierarchy, communication theory, address assignment and configuration method is described in detail. Secondly, developed a pure electric vehicle CAN bus network system, and to develop specific communication protocol to provide bus related hardware connection, the address number of communication nodes, node packet content. Again, in detail, an integrated manner about the central control unit, the control function in the software implementation of the battery management unit, the drive system unit, and the air conditioning system unit. CAN bus packets sent each node, the receiving process is given a specific message communication software design. It also introduced the touch interface design for electric vehicles on the LCD touchscreen. Finally, the subject of several nodes unit communicates FBI test. Succeeded in the acquisition of the information of the node concerned is displayed on the LCD touch screen. Several communication unit test platform, the rational design of the entire system, to achieve the desired effect.
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