Brushless DC motor controller for four-wheel independently driven electric automobile and control method thereof

Abstract

The invention relates to a brushless direct current (DC) motor controller for a four-wheel independently driven electric automobile and a control method thereof. The controller comprises a control unit, a communication unit and a power conversion unit, wherein the power conversion unit is connected with the control unit through a driving circuit and comprises an inversion circuit and a main contactor circuit; the inversion circuit has a three-phase full-bridge structure; and an input interface of the control unit is connected with a current detection circuit, a battery voltage detection circuit and a rotor position detection circuit. The controller is characterized in that: a power switching tube in the inversion circuit consists of a plurality of N-channel depletion power metal oxide semiconductor (MOS) tubes which are connected in parallel; the input interface of the control unit is also connected with a temperature detection circuit for detecting the temperature of a motor and the temperature of the power switching tube in the inversion circuit, and a short circuit detection circuit for detecting a short circuit signal of a power supply; and the driving circuit consists of an integrated drive chip and a current equalizing circuit. The motor controller has complete functions, a friendly interface and high reliability and practicability.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a brushless DC motor controller and a control method for four-wheel independently driven electric vehicles. Background technique [0002] Existing electric vehicles use a central motor to drive four wheels through a mechanical transmission. The central motor is a permanent magnet synchronous motor or an asynchronous motor, which has complex structure, low transmission efficiency, heavy vehicle weight and short driving range. [0003] The four-wheel independent drive electric vehicle adopts the distributed drive form in which the hub motor directly drives the wheels, that is, the motor is directly installed in the wheel to drive the wheel forward, making the electric vehicle a four-wheel independent drive. This structure can remove the complex transmission device, mechanical differential, half shaft and other drive train components, which not only simplifies the chassis structure, but...

AI Technical Summary

Problems solved by technology

[0004] The control system of four-wheel independent drive electric vehicles is more complex than the control system of centralized drive electric vehicles. The system not only has higher requirements for the function, reliability and safety of the motor controller, but also requires the motor controller to cooperate with the vehicle controller. Realize functions such as four-wheel electronic differential, currently there is no molded product

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