CAN Modeling and Network Simulation for City-Bus Information Integrated Control System

With the increase of the number and the complexity of city-bus ECUs (electronic control units), it needs to design city-bus information integrated control system for sharing information and implementing correlative, real-time control between these ECUs. Before city-bus information integrated control system development, it is necessary to simulate and analyse system performance. In this paper, we established CAN model with layered modeling method. According to CAN layered architecture, we implemented CAN model including physical layer model, MAC (Medium Access Control) sublayer model, LLC (logic link control) sublayer model and application layer model. For evaluating CAN network performance of city-bus information integrated control system, we defined message response time, network load and message repetition times as evaluation parameters. According to different message generation time, constant(15) condition and uniform_int(20, 50) condition, we finally simulated and analysed the network performance for city-bus information integrated control system. According to SAE J1939 protocol requirement, we concluded that all the messages satisfied with the system realtime requirement.