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The application of CAN in Electric Vehicle

Author: LiJie
Tutor: LiuLuYuan
School: Tianjin University
Course: Control Theory and Control Engineering
Keywords: Electric vehicles CAN scheduling Test Bit timer
CLC: U469
Type: Master's thesis
Year: 2003
Downloads: 828
Quote: 16
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CAN bus is a fieldbus developed by Bosch in 1986 to solve the data exchange between the car in numerous measurements and perform instrument. At present, China has independently developed the car only POLO and a few other cars using CAN bus technology. State 863 Fund \In practical applications, CAN bus does play a very good effect. In this paper, some practical techniques of CAN bus in electric vehicle applications. The key issues - the bit timing of CAN bus technology is discussed in detail, described from the point of view of the theory and practice of the bit timing. Due to the oscillator tolerance and bus length considering the node, so the bit timing parameters in the design settings exist a set of optimal value, bit timing calculation optimization process is carried out through the formula, combined with pure electric vehicles example is given. CAN specification for the physical layer and the data link layer are given a specific definition, only the application layer requires the user to design according to the specific circumstances. Vehicle CAN bus standard SAE J1939 protocol trucks and buses, we designed a pure electric vehicle application layer protocol, defined identifier of each packet and data. The schedulability adoption rate monotonic scheduling algorithm reinvent scheduling strategy is currently being implemented in the pure electric vehicles, so that it no longer is a lack of management of random scheduling, the entire network using the ratio monotonically method analysis and system redundancy calculated. Schedulability of the actual system has been significantly improved. Finally, although many companies at home and abroad, production CAN bus analysis software, used in electric vehicles is still a lot of areas for improvement, the CAN bus monitoring system developed in pure electric car project, and error cycle theory tested under the guidance of the CAN bus. In addition, the initial exploration for embedded real-time operating system. CAN bus is now widely used in the field of process industry, mechanical industry, textile machinery, agricultural machinery, and sensors, the research content of universal significance.

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