Study On Communication Network Of HEV Based On CAN

The thesis covers the research work on the serial hybrid electric vehicle CAN-bus and in-vehicle network that I have done on my issue.What serial hybrid electric vehicle differs from traditional vehicle is its driven motor.The realization of vehicle control strategy and the embodiment of HEV's advantage is determined by the optimized distribution of whole power source.The key control units can be linked by CAN-bus via the communication network.The instructions and the parameters can be transmitted and exchanged credibly and real-timed.According to the control program preestablished in the multi-energy management unit,the power source can be optimized distributed in conformity to the control strategy.The powertrain of serial hybrid electric vehicle is researched combined with city-bus duty cycle and the function of every control unit is analyzed. Network topology structure of six CAN nodes is established including engine control unit, generator control unit,driven motor control unit,battery management unit and LED display unit.CAN-bus framework and message transmission are researched. Coding regulation and SAE J1939 protocols, which are correlative to the in-vehicle electronic CAN network, are studied in this thesis, and the source address of network nodes are defined,with the HEV communication messages defined in details.The software and hardware platform are constructed which includes following two parts: (1) Designing the hardware circuit of two kinds of high speed CAN nodes respectively based on ARM and Freescale which includes the power module, the CAN interface module and the microcontroller module.A general compare between the hardware also be given. (2) Designing the software of ARM-CAN nodes based on analyzing the internally CAN controllor and FullCAN expert function base. Designing the software of Freescale CAN nodes based on analyzing the msCAN controllor. Bringing forward compare between two kinds of nodes in both buffer configure and message filtration setting.Found CAN communication projects both in ADS 1.2 integration development environment and HC12(V4.5)CodeWarrior development environment, complete the debug,make and download of programme.Take experiment of ARMCAN based on CANstarter-II development suit and experiment of Freescale based on MC9S12DG128 system of Tsinghua university. The test results show that the CAN nodes can realize the reliable and real-time communication and can perform message filtration.At the end of the paper, the conclusions of the research and the innovation points are pointed out, and expectation on further research and development is also put forward.