Compensation coefficient self-adaptive torque compensation method

Abstract

The invention discloses a compensation coefficient self-adaptive torque compensation method. The method comprises the following steps: S1, calculating a target rotating speed of a driving motor according to a current target torque of the driving motor and a feedback rotating speed of the motor; s2, calculating a current rotating speed deviation value according to the target rotating speed and the feedback rotating speed of the driving motor; s3, whether torque compensation is carried out on the target torque or not is judged by comparing the current rotating speed deviation of the driving motor with a deviation threshold value; s4, constructing a dynamical model of the rotating speed deviation value and the current vehicle driving related parameters; s5, torque compensation coefficient self-adaption processing is carried out according to the vehicle driving state; s6, performing compensation and amplitude limiting processing on the current target torque of the driving motor; and S7, outputting a final target torque value for ammeter look-up. According to the invention, torque compensation can be carried out on the driving condition of the electric vehicle in real time, and the driving performance of the whole vehicle is improved without increasing hardware cost; and meanwhile, a large amount of calibration work of whole vehicle shake removal is omitted.

Description

technical field [0001] The invention relates to the field of electric motor control of electric vehicles, in particular to a torque compensation method with an adaptive compensation coefficient. Background technique [0002] In order to cope with the problem of energy shortage, driven by the current electrification of the vehicle industry and the national carbon neutrality policy, the development of new energy vehicles is in full swing. In recent years, my country's pure electric vehicles will gradually increase the cruising range, and the energy density of the battery will gradually increase. Compared with developed countries, many technological gaps are narrowing. [0003] Because the torque of the motor of the new energy vehicle changes frequently with the driving conditions and the driving road under the electric condition. During normal driving, by depressing the accelerator pedal, the power of the drive motor is transmitted to the wheels through the transmission syste...

AI Technical Summary

Problems solved by technology

[0004] When the driver intends to accelerate or decelerate rapidly, and considering different driving road surfaces, the output torque of the motor will fluctuate greatly, resulting in a large fluctuation in the feedback speed of the motor, which will be transmitted to the wheels through the transmission system, and the vehicle will appear Vibration phenomenon seriously affects drivability

[0005] At present, most manufacturers use the method of calibrating the torque compensation coefficient of the whole vehicle to indirectly compensate the torque, but this method has a large workload, and the driving conditions and road conditions involved are relatively limited.

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