Study On Communication Network Of Fuel-cell City Bus Based On CAN

Fuel-cell electric vehicle (FCEV) can reduce energy consumption effectively which uses fuel cell as main power source instead of internal combustion engine. And emission is the water, so fuel-cell vehicles belong to non-polluting vehicle. As a result, FCEV has long term potential in the future. The Fuel-cell City Bus (FCCB) is most likely to be the first to achieve industrialization, so this paper selects the FCCB as research subject. In order to solve the problem among various controllers of FCCB to exchange information, intelligentize communication network[0] is needed. CAN-bus is the best choice because of security, real-time and flexibility. According to standard conform to CAN2.0B and J1939 protocol as well as control structure and actual condition of FCCB, this paper with FCEV for application platform designed a whole communication system comparatively.This paper discussed and analyzed the structure of fuel-cell city bus and some of the key technology in fuel-cell city bus. Network topology structure of five CAN nodes is established including vehicle control unit, fuel-cell engine control unit, driven motor control unit, ultracapacitor 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 FCEV communication messages defined in details.The software and hardware platform are constructed which includes two parts as follow: (1) Designing the hardware circuit of two kinds of high speed CAN nodes respectively based on ARM , the CAN interface module and the microcontroller module. (2) Designing the software of ARM-CAN nodes based on analyzing the internally CAN controllor and FullCAN expert function base. Study on nodes in buffer configure and message filtration setting.CAN communication projects is established based on ADS1.2 integration development environment and the debug is complete, compiled and loaded. Experiment of ARMCAN based on CAN starter-II development suit is used. The test results show that the CAN nodes can realize the reliable and real-time communication and can perform message filtration, it is able to meet the design requirements. 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.