Electric vehicle motor rotor position determination method and electric vehicle control device

Abstract

The invention relates to an electric vehicle motor rotor position determination method and an electric vehicle control device, and the method comprises the steps: obtaining a target current of a motor under an alpha axis of a two-phase static coordinate system after a high-frequency sinusoidal voltage signal is inputted to the motor, and enabling the component of the high-frequency sinusoidal voltage signal under a beta axis of the two-phase static coordinate system to be zero; extracting a high-frequency current corresponding to the high-frequency sinusoidal voltage signal from the target current; performing first discrete Fourier transform on the high-frequency current to obtain a current amplitude of the high-frequency current; performing second discrete Fourier transform on the current amplitude to obtain a first phase corresponding to the current amplitude; and based on the first phase and the phase offset corresponding to the first discrete Fourier transform, compensating the rotor angle of the motor collected by the Hall sensor to obtain a target rotor angle. According to the invention, the problem that the determination accuracy of the motor rotor angle is low is solved, and the technical effect of improving the determination accuracy of the motor rotor angle is achieved.

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