Design of electric vehicle controller with dual CAN interfaces

The problem of communication between the in-vehicle controllers of Electric Vehicle (EV) and the Controller Area Network (CAN) is built. There were two subnets in this system, which is connected by the controller with dual CAN interfaces, and the baud rate is 250 kb/s. The extended frame of CAN2.0B is applied in the whole subnets. According to the SAE J1939 standard, the communication protocol is established. The Protocol Data Unit (PDU) and the Parameter Group Number (PGN) of various in-vehicle controllers is set down. The whole-vehicle controller is developed in NEC V850 70F3239 microprocessor, which contained dual CAN channels. The cycle of transmission is 10 ms, and the reception is triggered by interrupt. The controller also gatheres the signal of vehicle speed, pedal position, brake pressure, battery voltage and current. The system is tested in an low-deck PEV, BK6121EV, and works well.