Gear shifting control method and device for pure electric mode of hybrid electric vehicle

Abstract

The invention provides a gear shifting control method and device for a pure electric mode of a hybrid electric vehicle which belongs to the technical field of vehicles, and solves the problem that inthe prior art, the power interruption time is long during gear shifting. The gear shifting control method for the pure electric mode of the hybrid electric vehicle comprises the steps of when it is judged that a target gear is inconsistent with a current gear according to the real-time working condition information of the vehicle, entering a gear shifting mode; unloading the torque of a driving motor to zero; enabling a synchronizer to be disengaged from the current gear to a neutral gear; when the synchronizer is disengaged to the synchronization point of the current gear, sending out a speedregulation instruction signal through a gearbox controller; using a motor controller to control the driving motor to adjust the speed, and when the rotating speed of the driving motor reaches the target rotating speed, unloading the torque of the driving motor to zero; and enabling the synchronizer to enter the target gear, and recovering the torque of the driving motor to the target torque. Theinvention further provides a gear shifting control device for the pure electric mode of the hybrid electric vehicle. According to the invention, the gear shifting power interruption time in the pure electric driving mode can be shortened.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and relates to a shift control method and a device thereof in a pure electric mode of a hybrid electric vehicle. Background technique [0002] In the dual-clutch hybrid model, due to the existence of a separate electric drive mode, its pure electric drive mode shift is AMT-like. When upshifting in pure electric drive mode, the power interruption time is too long, especially when the high-voltage battery is limited to charge, the ability of the motor to actively adjust the speed is limited, and the power interruption time will be longer, resulting in poor driving experience. Therefore, it is very important to shorten the power interruption time of shifting in pure electric drive mode. [0003] In view of the above-mentioned problems, the existing Chinese patent literature discloses a shift control method of a hybrid electric vehicle [application number: CN201410559860.9], which includes the f...

AI Technical Summary

Problems solved by technology

However, since the speed control command is sent from the gearbox controller to the motor controller, there will be a lag in the actual execution of the motor controller. This invention still has the problem of long power interruption time, and the quality of shifting is still insufficient.

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