Method for grade parking (anti-backward sliding) of permanent magnet motor-driven pure electric vehicle

Abstract

The invention discloses a scheme for controlling the grade parking of a permanent magnet motor-driven pure electric vehicle. The pure electric vehicle has an electrical system comprising a battery pack, a motor, a power converter, a motor controller and a vehicle controller and further comprising corresponding voltage, current and tilt sensors. The scheme comprises two steps of: (1) detection for the initial position of a rotor of a permanent magnet synchronous motor: a detection voltage is applied to the permanent magnet synchronous motor by the power converter, and the initial spatial position of the motor rotor in the case that the vehicle is stationary is calculated through a current feedback signal; and (2) torque self-balancing strategy based on vector control: the torque self-balancing characteristic can enable driving torque to track load torque automatically. The torque required by parking is calculated in accordance with the tilt angle of a ramp on which the vehicle is to be parked, and then, reasonable current amplitude and phase are given according to the initial position of the rotor and the torque required by grade parking in order to enable the driving torque to be equal to the load torque, therefore, stationary parking of the vehicle on the grade is realized.

Description

technical field [0001] The invention relates to the field of pure electric vehicles in which a permanent magnet synchronous motor is the main drive motor, and specifically relates to using a permanent magnet synchronous motor vector control technology to prevent a vehicle from sliding on a slope so as to achieve the effect of standing on the slope. Background technique [0002] Pure electric vehicles are powered by the on-board power supply, and the electric energy is converted into mechanical energy through the motor to drive the wheels. At present, the types of drive motors that can be applied to electric vehicles mainly include DC motors, induction motors, permanent magnet synchronous motors, DC brushless motors, and switched reluctance motors. Since permanent magnet motors have the advantages of high efficiency, stable output torque, and large power-to-volume ratio, and my country has rich reserves of rare earth resources, electric vehicles driven by permanent magnet syn...

AI Technical Summary

Problems solved by technology

This solution can also be applied to pure electric vehicles, but the operating status sensor in it increases the cost and complexity of the system

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