The solution of hybrid electric vehicle information system by modbus protocol

This paper introduces the hybrid electric vehicle information system, which is realized by modbus protocol. Using a remote terminal control unit (RTU) with EVEW touch-screen, the system achieves the communication between electronic control units (ECU) and the RTU by means of the modbus protocol at the baud rate 38400kb/s, and it finishes the task of human-machine exchange. Hybrid electric vehicle control unit uses dual-core processors: the host processor and the coprocessor XGATE. XGATE can reduce the load on the host processor, which makes the host processor timely response to a number of hybrid control tasks, and it improves the requirements of real-time in hybrid control system. In addition, because modbus protocol has opening characteristics, most of serial communication controllers support the protocol. Therefore, the system can be applied in the serial communication with modbus protocol.