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Monday, November 1, 2010

Capacitor hybrid vehicle CAN communication network

After more than a century, the traditional fuel vehicles have gradually unable to meet the requirements of sustainable development. The development of energy-saving and environmental protection trend, many countries have turned their attention to electric vehicles and fuel vehicle development and research. Hybrid electric vehicle (HEV) for its good economic performance and emissions performance, the current world is becoming an important development direction of new car one. New technology will be a controller area network communication network CAN (Controller Area Network) used in HEV hybrid cars are becoming the focus of research. The thesis of the "863" program of major energy-saving and new energy vehicles special project "Novel capacitor hybrid automobile product development" as the basis to capacitive hybrid vehicles as the research object, the vehicle CAN network to carry out the design and development of hybrid vehicles to improve vehicle CAN communication system development level and improve system reliability provides an important basis. This paper analyzes the capacitor hybrid electric vehicle powertrain and subsystems operating characteristics of the controller to determine the function of each node on the bus and the interaction required between the control unit of information, on this basis, the vehicle network the overall planning and design, and design meet the requirements of HEV control, compatible with the SAE J1939 protocol CAN communication protocol. Meanwhile, EMC vehicle CAN networks are analyzed, in the CAN network design using different interference technology to improve the electromagnetic compatibility of the vehicle CAN networks. In the research vehicle and communications interface between the various subsystems on the basis of the program, based on dSPACE real-time simulation systems, and signal boxes, the development of HEV based on CAN bus communication hardware in the loop simulation platform that simulates real vehicle CAN network communication operation environment. And based on the CAN bus communication platform and real-time simulation of the load rate for the CAN bus provides a theoretical basis for performance optimization. Developed a hybrid electric vehicle control system vehicle CAN networks. In the hybrid electric vehicle research and development stage, through the system can easily form on the vehicle CAN data network monitoring, performance verification for the CAN bus provides a convenient test. Launched a capacitive hybrid vehicle CAN communication system performance test, the test bench and vehicle CAN verify the accuracy and integrity of network communications, and further improved and perfected through trial CAN communication protocol and communication system performance. In order to improve the efficiency of testing, the use of hybrid vehicles developed by CAN network monitoring system to test the process of effective monitoring and control. The results show that the development of the CAN communication protocol and the vehicle CAN communication system to meet the operational requirements of real vehicle to ensure the powertrain system to communicate real-time, to achieve good results. 

Key words: hybrid cars, CAN bus, the hardware in the loop simulation, control systems

 

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