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Vehicle management unit is the maincenter of electric vehicle, the key to realizing the response characteristic of electric vehicle and exchange medium between man and vehicle. It is expound that the status and function of vehicle management unit in a whole vehicle. A communication is utilized between the battery management unit, the power management unit, and the assistant system of vehicle surrounding vehicle management unit. This paper describes a communication method based on the characteristic of vehicle management unit. First, the communication content of the vehicle management unit is analyzed and a novel 485 series communication is put forward. According to the ASCII mode communication protocol adopted, the communication content is established. Index Terms--Battery management unit, communication protocol, power management, vehicle management unit.

A controller of brushless dc motor (BLDCM) for electric vehicle is developed based on the mathematical model of BLDCM and special working condition. The drive and control circuit is composed of digital signal processing and EXB841. The paper analyzes the hardware structure of system in detail. Proportional-integral-differential control strategy is adopted in the system. An arithmetic variable velocity prelabeled value is presented, in order to solve regulating rotate speed in large range accurately. The paper also analyzes flux-weakening control in high speed and method of energy regenerative braking when the vehicle is decelerating. Index Terms--BLDCM, DSP, flux-weakening control.