Model-based anti-shake control method for motor-driven vehicle

Abstract

The invention discloses a model-based anti-shake control method for a motor-driven vehicle, which comprises the following steps of: obtaining a motor torque request, performing integral estimation on the rotating speed of a motor, performing negative feedback estimation on a rotating speed error and resistance torque, and performing low-pass filtering. The problem that an electrically-driven vehicle shakes because the motor shakes is solved. The motor torque request is subjected to torque compensation by a model-based rotating speed feedback control method in a closed loop control mode, so that the problem that the vehicle shakes and vibrates under specific working conditions is solved, and the driving comfort of the vehicle is improved; the problem that the vehicle shakes when a vehicle speed exceeds a vehicle speed interval corresponding to the resonant frequency of a power system under the working conditions of starting and accelerating, low-speed rapid accelerating and low-speed rapid decelerating is solved; and a way for solving the problem that the vehicle shakes on the premise of not sacrificing the power performance and braking performance of the vehicle is provided.

Description

technical field [0001] The present invention relates to an anti-shake control method for increasing the driving comfort of a vehicle, more particularly, to an anti-shake control method for improving the driving comfort of a vehicle driven by a motor. When the vehicle is in a specific speed range, the torque compensation feedback control based on the model can be used to suppress or alleviate the vehicle shaking problem caused by the motor. Background technique [0002] As an important source of power for hybrid and pure electric vehicles, the drive motor often has output torque fluctuations due to reasons such as design, manufacture, and control, which not only affect the performance of the motor and cause vibration, but also cause damage to the powertrain of the vehicle. Vibration, the vibration of the car directly acts on the human body and has a direct impact on the comfort of the car. [0003] The test proves that during the driving process of the vehicle driven by the ...

AI Technical Summary

Problems solved by technology

[0004] (1) In order to pursue acceleration performance, when the vehicle is started or at a low speed, the accelerator pedal is suddenly stepped on. At this time, the torque demand for the motor will rise rapidly. With the fluctuation and oscillation of the motor speed, if there is no suitable motor torque control method, the driver will be unable to Visible vehicle vibrations and vibrations

[0005] (2) Under low vehicle speed conditions, when the driver slams on the brake pedal in order to decelerate rapidly, the rapid decline in the torque required by the motor will also bring the driver a feeling of vehicle shaking and vibration

[0007] For the conditions (1) and (2), the vibration can be reduced by reducing the torque change rate, but the driver's driving intention will be delayed, thereby reducing the dynamics of the vehicle (acceleration condition) or increasing the braking distance (braking operating conditions) thus creating a potential hazard

Working conditions (1), (2) and (3) can also increase the vehicle speed corresponding to the resonance frequency to the medium-high speed area by reasonably matching the damping and stiffness of the power system mount, thereby reducing the driver's uncomfortable feeling, but It will lead to an increase in development costs and a negative impact on the solution to other vehicle vibration and noise problems

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