The Design Of Communication And Display System Of Electric Vehicle Based On CAN Bus

Based on the synthetic analysis of the research actuality and development trends of electric vehicles (EV) and their control network, in this paper, a kind of control network, namely the CAN BUS-based control network, for the fuel cell EV is studied, and a communication and display system of electric vehicles and its experiment flat. The communication and display system of electric vehicles can be used to record and store the information of vehicles, such as velocity, time, distance, etc. It achieves supervisory control and data acquisition for the whole electric vehicle.CAN Specification Version 2.0, in-vehicle network technology and SAE J1939 protocols, which are correlative to the in-vehicle electronic CAN network, are studied in this thesis, and a scheme is brought forward to develop the in-vehicle electric CAN network which includes selecting higher layer communication protocols, designing the general network architecture and laying out the developing course. As concrete use to the above-mentioned research, the CAN-bus developing/testing network is founded, and a network communication experiment and the development of CAN-bus node are performed based on the founded platform.To apply the above-mentioned research to concrete use, in the study, designs the communication and display system node's software and the hardware of CAN-bus and the real-time display LCD interface, adopted software, hardware anti-interference measure accordingly. Bringing forward a scheme of composing the hardware platform, founds a two-node CAN-bus developing/testing network including the motor control system, the battery management system, the communication and display system and the upper PC supervising system, and performs a CAN-bus network communication experiment. The upper PC supervising system includes PC, CAN communication card and the supervising software which is designed by VB. Through the node to node communication system, it studies and analyses, dependable of single and several data unit communication.In the end, the communication and display experiment is completed. The LCD displays the velocity, distance and warning real-time massage of the motor control system and the real-time battery management massage.The picture of the system includes starting map, waiting map, information map and help map. Besides the display of number, it also can show the massage by drawing the dynamic columns and curves.The experimental results show that every circuit of this control system has a logical design and runs smoothly, so we believe this system has reached the anticipated purpose. Besides, the lack and the work which need to improve of my work are also present.