A Vibration Restraining Method That Can Reduce Torque Loss

Abstract

The invention discloses a vibration suppression method capable of reducing torque loss, which comprises the following steps: obtaining the real-time rotational speed of a motor based on a phase-locked loop; determining the vibration frequency interval during the running process of a vehicle without any vibration suppression; and obtaining Real-time jitter frequency of the motor speed; design a PR proportional resonant filter, and obtain the jitter amount of the motor speed through the PR proportional resonant filter; compensate the requested torque sent by the VCU to obtain the output torque; judge whether the requested torque is satisfied and exit the shake suppression control condition, if so, adjust the output torque through the torque closed loop, after the adjustment is completed, exit the vibration suppression control and torque closed loop, control the motor to run according to the adjusted output torque, otherwise, control the motor to run according to the output torque. The shake suppression method disclosed by the invention can control the exit of the shake suppression, so that the shake suppression will not intervene in the running process of the car in the whole process, thereby reducing the loss of torque.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a vibration suppression method capable of reducing torque loss. Background technique [0002] Due to the frequent work of new energy vehicles in positive and negative torque switching and rapid acceleration conditions, and except for several leading companies in the industry, there is currently no chassis specially developed for new energy vehicles. The deceleration is too fast and other characteristics, resulting in continuous low-frequency vibration when the vehicle is stepping on the accelerator, which seriously affects the driving experience of the driver. [0003] There is an obvious disadvantage in the existing vibration suppression methods, that is, at high speeds, due to the large amplitude of the speed fundamental frequency, in order to reduce the observation delay as much as possible, the cut-off frequency of the observer needs to be designed as large as possi...

AI Technical Summary

Problems solved by technology

This patent document can only suppress the motor vibration of the electric vehicle, but cannot reduce the torque loss generated during the vibration suppression process of the electric vehicle

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