Motor shaking restraining method and device for electric automobile

Abstract

The invention relates to a motor shaking restraining method and device for an electric automobile. The motor shaking restraining method for the electric automobile comprises the following steps: according to the rotating degree and the rotating time of a rotor, calculating the rotating angular speed of the motor; according to the angular speed and the rotary inertia, calculating torque shaking capacity; performing filtering treatment and hysteresis loop comparison on the torque shaking capacity; when the torque shaking capacity reaches the set torque range, obtaining the motor shaking frequency which is the shaking frequency corresponding to the torque shaking capacity; combining the torque shaking capacity with a torque command, and controlling the motor within the shaking frequency. According to the motor shaking restraining method and device for the electric automobile disclosed by the invention, the shaking frequency section of the motor is calculated, and the corresponding torque shaking capacity is combined with the torque command, so that the rotation of the motor is controlled, and the motor shaking of a low-frequency electric automobile is effectively restrained.

Description

technical field [0001] The invention relates to the field of control strategies for electric control systems of new energy vehicles, in particular to a method and device for suppressing vibration of electric vehicle motors. Background technique [0002] With the rapid development of the automobile industry, the number of traditional cars has risen sharply. At present, traditional cars have had a huge impact on climate change, environmental pollution, energy shortage and other aspects. In view of the above problems, a pure electric vehicle (Blade electric vehicle, BEV) has been widely used, and the electric vehicle can effectively solve the above-mentioned series of problems. [0003] In the prior art, the transmission system of pure electric vehicles has a different structure from that of traditional vehicles. Pure electric vehicles do not have clutches and traditional gearboxes, but only one reducer. The transmission system is basically rigidly connected, and there is a la...

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Problems solved by technology

[0004] However, in the prior art, the motor vibration compensation in the low frequency range has a long calculation cycle, and still needs to rely on the motor controller (Microcontroller Unit, MCU) for torque compensation, and there is a gap between when the VCU sends an instruction and when the MCU outputs the torque according to the instruction. With a certain delay, the suppression of motor jitter is limited, and the motor still jitters

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