Automatic shift control method of motor-transmission integrated drive system for electric vehicles

Abstract

The invention discloses an automatic gear shift control system and method of a motor-transmission integrated drive system for an electrical vehicle. The motor-transmission integrated drive system comprises a drive motor, a transmission, a motor controller and a gear shift execution mechanism, wherein the drive motor is directly connected with the transmission through a spline and controlled by the motor controller to output a torque to the transmission; the gear shift execution mechanism is used for finishing the gear shift operation of the transmission; the motor-transmission integrated drive system is characterized in that a vehicle controller is arranged for coordination control on the motor controller and the gear shift execution mechanism to realize automatic gear shift function of the motor-transmission integrated drive system; the vehicle controller and the motor-transmission integrated drive system form the automatic gear shift control system. According to the automatic gear shift control system, the automatic gear shift function of the motor-transmission integrated drive system can be realized and the gear shift quality of the motor-transmission integrated drive system can be improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, relates to the automatic gear shift control technology of electric vehicles, in particular to an automatic gear shift control system and method of a motor-transmission integrated drive system for electric vehicles. Background technique [0002] Traditional AMT vehicles cut off the power transmission of the vehicle through the separation of the clutch during the gear shifting process, and rely on the sliding friction of the synchronous ring to complete the synchronization process and realize gear shifting. In the motor-transmission integrated drive system in the prior art, the clutch is eliminated between the drive motor and the transmission, and the spline is directly connected, which greatly simplifies the structure, reduces the production cost, and improves the transmission efficiency. However, for the motor-transmission integrated drive system, the coordinated control of the drive mo...

AI Technical Summary

Problems solved by technology

However, for the motor-transmission integrated drive system, the coordinated control of the drive motor, transmission, and shift actuator during the automatic shifting process is very complicated, and noise and shifting shock are likely to occur during the shifting process, which seriously affects the performance of the vehicle. Smooth shifting and ride comfort

However, in the existing automatic shift control technology of the motor-transmission integrated drive system, the control system is complicated and the functions are not comprehensive, and there are few studies on the specific control methods of coordinated control. During the gearing process, the noise impact is large, the shifting time is long, and the shifting quality is not high

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