Non-clutch non-synchronizer AMT gear changing control method of short-distance blade electric vehicle

Abstract

The invention discloses a non-clutch non-synchronizer AMT gear changing control method of a short-distance blade electric vehicle, and relates to a non-clutch non-synchronizer AMT gear changing control method of a blade electric vehicle. According to the control method, when the vehicle needs to change gears during traveling process, a direct-current brushless driving motor is braked by matching two forms of electric braking and PI control, the time needed in speed reduction of the driving motor is shortened, on this basis, and a gear changing motor similarly adopts electric braking, so that the motion of a gear changing execution mechanism and the speed regulation of the driving motor can be conducted simultaneously, the position control error of a shifting fork is less than 0.04mm, the fastest motion speed of the shifting fork can be guaranteed, the needed time is shortest, and the gear changing time is shortened. The gear changing time is basically the same as that in static state, smooth gear changing effect can be simultaneously guaranteed, the difference of rotating speed in gear engaging is less than 50r / min, and people basically cannot feel gear changing shock during gear changing. The gear changing speed is fast, the gear changing impact degree is low, and the dynamic performance of the electric vehicle can be improved.

Description

technical field [0001] The invention relates to a clutch-free and synchronizer-free AMT shift process control method for a short-distance pure electric vehicle. Specifically, it is a short-distance pure electric vehicle without a clutch and without synchronization, which has fast shift speed, small shift impact, and can improve the power performance of the electric vehicle. AMT shift control method. Background technique [0002] Faced with increasingly severe energy and environmental problems, more and more countries regard the development of new energy vehicles as a national development strategy in the new century. AMT (Automatic Mechanical Transmission) has simple structure, high transmission efficiency and low cost, which helps to improve the power and economy of short-distance pure electric vehicles, and has a good application prospect. [0003] The deficiencies of the existing AMT control methods mainly include: (1) The control of the traditional AMT shift actuator wit...

AI Technical Summary

Problems solved by technology

[0003] The deficiencies of the existing AMT control methods mainly include: (1) The control of the traditional AMT shift actuator with synchronizer usually adopts the position PD (proportional derivative) control to precisely control the position of the shift fork and the axial movement speed (shaft If the moving speed is too large, the target gear will be engaged when the synchronizer is not synchronized), the traditional PD control is not only complicated, but also cannot guarantee that the control of the shift actuator is optimal in time, resulting in a long shift time. (2) The time required for the DC brushless drive motor to decelerate during the speed matching stage during the shifting process is too long, mainly because the speed control of the DC brushless drive motor usually adopts PI control, and the motor speed drops slowly, resulting in a The matching time is relatively long, and the shifting time is also relatively long, which affects the dynamic performance of short-distance pure electric vehicles

Images