AMT gear shifting process control method

Abstract

The invention discloses an AMT gear shifting process control system and method. The system comprises two independent control units, namely a TCU and an MCU, the TCU is connected with a gear shifting motor, the gear shifting motor is installed on a gear shifting executing mechanism, the MCU is connected with a driving motor, and data transmission and instruction transmission are conducted between the TCU and the MCU through a CAN bus; the TCU continuously judges whether to update the target gear or not according to the collected signals including the vehicle speed, the accelerator pedal openingdegree and the vehicle acceleration; and the TCU sends a torque unloading instruction, a free mode instruction, a speed regulation instruction, a random torque control instruction and a torque loading instruction to the MCU, and sends a non-control instruction. Active torque control is carried out on the gear shifting motor in the gear disengaging and engaging stages in the gear shifting process,precise positioning of the gear shifting executing mechanism is achieved, and meanwhile the PI control algorithm is assisted to improve the gear engaging success rate and the whole vehicle dynamic property.

Description

technical field [0001] The technical field of vehicle power system control, specifically relates to an AMT (Automatic mechanical transmission) shift process control method compatible with pure electric and hybrid systems. Background technique [0002] For the AMT products of new energy vehicles, the TCU is generally used to control the shift motor to drive the shift actuator to control the shift process. The traditional control method is to use the PID control method to perform closed-loop tracking of the shift displacement to output a reasonable PWM duty. Compared with controlling the shifting motor, due to the hysteresis response of the shifting actuator itself, the whole shifting control time is longer; in addition, in order to further reduce costs, AMT gearboxes began to adopt the shifting method without synchronizers, that is, changing to the form of a combination sleeve, and Combining gear shifting is prone to the phenomenon of top teeth, resulting in long shifting tim...

AI Technical Summary

Problems solved by technology

[0002] For the AMT products of new energy vehicles, the TCU is generally used to control the shift motor to drive the shift actuator to control the shift process. The traditional control method is to use the PID control method to perform closed-loop tracking of the shift displacement to output a reasonable PWM duty. Compared with controlling the shifting motor, due to the hysteresis response of the shifting actuator itself, the whole shifting control time is longer; in addition, in order to further reduce costs, AMT gearboxes began to adopt the shifting method without synchronizers, that is, changing to the form of a combination sleeve, and Combining gear shifting is prone to top teeth phenomenon, resulting in long shifting time or even shifting failure

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