Downshift deceleration compensation method and device, vehicle and storage medium

Abstract

The invention discloses a downshift deceleration compensation method and device, a vehicle and a storage medium. The method comprises the steps of sending a motor downshift request to an automatic gearbox control unit; receiving a motor torque unloading request sent by the automatic gearbox control unit; sending a motor unloading torque request to an integrated combined power device to control a motor unloading torque; in the process that the integrated combined power device makes the motor unload the torque, acquiring a current target recovery torque, a current target stable torque and a motor transmission ratio before downshift, wherein the target recovery torque includes the torque determined based on a current vehicle speed; determining a target brake torque based on the current targetrecovery torque, the current target stable torque and the motor transmission ratio before downshift; and sending the target brake torque to a vehicle body electronic stability control system so as tocompensate a braking force for the vehicle based on the current acceleration and the target brake torque. By utilizing the technical scheme provided by the invention, smoothness of downshift deceleration can be improved, and a potential safety hazard of driving is reduced.

Description

technical field [0001] The present application relates to the technical field of vehicle driving control, in particular to a downshift deceleration compensation method, device, vehicle and storage medium. Background technique [0002] With the continuous development and wide application of vehicle driving control technology, it also brings some safety problems. [0003] At present, it is often necessary to adjust the gear position of the vehicle according to the road conditions during driving. The torque of the motor needs to be unloaded to shift gears. During the gear shifting process, the coasting energy cannot be recovered, resulting in fluctuations in vehicle acceleration during downshifting and deceleration, and obvious shaking and unevenness of the vehicle, which brings hidden dangers to driving safety. In the prior art, such as the patent application number: 201910404287.7, it is disclosed that in the scenario where the gear is not stepped on the brake, it is combine...

AI Technical Summary

Problems solved by technology

However, the above-mentioned existing patents are only applicable to the scene of not stepping on the brake when the gear is in gear, and the single combined torque stored by the braking energy recovery during the period when the motor is not shifting is used as the compensation torque, which cannot cope with various changing vehicle conditions. There are driving safety hazards

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