Vibration reduction control method and apparatus of power train by controlling motor torque of electric vehicle

摘要

The present invention relates to a vibration control method and apparatus of a power train in a vehicle for reducing the vibrations in a power train when driving on a protruded portion of a road surface using a motor torque control. The apparatus comprises a processor configured to determine the generation of vibrations in a power train as the vehicle passes on the protruded portions of the road surface; and calculate a compensation torque for a vibration reduction of the power train when vibrations occur in the power train as the vehicle passes on the protruded portions of the road surface.

主权项

1. A vibration reduction apparatus of a power train for controlling a motor torque of a vehicle, comprising:
a processor configured to:
receive an acceleration signal of the vehicle from a vehicle body acceleration sensor by a band-pass filter, wherein only a certain frequency band is passed therethrough by the band-pass filter;measure a size of an acceleration signal component of a frequency band passed through the band-pass filter and determining an occurrence of vibrations in the power train when a change ratio per hour of the size of the acceleration signal component exceeds a threshold value;calculate a compensation motor torque for reducing the vibrations of the power train when the vibrations occur in the power train as the vehicle passes on protruded portions of a road surface, wherein the calculation of the compensation motor torque includes:
detect a motor measurement torque signal using a band-pass filter, wherein only a certain frequency band is passed therethrough, andcalculate the compensation motor torque to measure the size of the motor measurement torque signal component of the certain frequency band passed through the band-pass filter, to calculate the change of the motor torque caused by the vibrations of the power train and to subtract the change of the motor torque based on the vibrations of the power train from the motor torque calculated according to a driving mode of the vehicle; and apply the calculated compensation motor torque to the power train to compensate the vibrations in the power train.