The Design Of HEV Communication System Based On J1939 Protocol

Recent years, in order to solve the problem of the expend of energe sources and releasing of the bus in city,the technology level of the HEV have a great improvement.Hybrid Electric Vehicle(HEV) has two sources of power,so the structure of it is very complex. A great deal of electronic euipments were adopted in HEV to observe and share many informations. For the reasons of fussy, expencive of price,low reliability and costliness of maintenance,the traditional connection can not satisfy the request of vehicle connection. What this paper works over is comunication system among each HEV's Ecus.To solve the problem which the electric equipmens brings, BOSCH corporation explored CANbus(Controller Area Net).At present,CANbus has already been one of the Fieldbuses which is applied most widely in world. Its specification has been set down the international standard by ISO(International Organization for Standardizatoin).CAN protocol is based on ISO's OSI, but its model structure only has three layers, which are physical layer, data link layer and application layer. As CANbus defined physical layer and data link layer excepting application layer, many famous higher layer protocols have appeared, such as DeviceNET, CANopen, J1939/ISO 11783 and so on. Thereinto, SAE(Society of Automotive Engineers) has set down J1939/11783 applying for truck and bus. At the same time, there was no uniform CAN higher layer protocol applying for HEV by now.This paper describes the application of the CANbus and the J1939 protocol which used in truck and bus communication. As the shortage of protocol for HEV, we defined an application layer protocol of HEV according to the J1939 protocol. And we also made a simulation experiment for CANbus using CANoe system. The experiment proved the workability of the protocol.