Control method of shift fork engagement force of dual-clutch automatic transmission

Abstract

The invention discloses a control method of gear shifting force of a shifting fork of an automatic dual-clutch transmission. After a gear shifting pressure control module receives a gear shifting command, the initial stage is switched to the pre-synchronization stage, initial gear shifting pressure is controlled, and a gear sleeve sliding block is driven by the shifting fork to move to the position where the gear sleeve sliding block is to make contact with a synchronizing ring; in the synchronization stage, the synchronous gear shifting pressure is controlled, and the gear sleeve sliding block is continued to be driven by the shifting fork to make contact with the synchronizing ring; in the sliding stage, the sliding gear shifting pressure is controlled, a synchronizer gear sleeve is driven by the shifting fork to move to the position where the synchronizer gear sleeve is to make contact with a conjunction gear; in the conjunction stage, the conjunction gear shifting pressure is controlled, and the synchronizer gear sleeve is engaged with the conjunction gear; and in the termination stage, gear shifting is completed by outputting a gear shifting termination state signal. According to the control method of the gear shifting force of the shifting fork of the automatic dual-clutch transmission, adaptive change of gear shifting force of gears is achieved, a gear shifting pressure curve is smooth in the gear shifting process, and one-time fast gear shifting is achieved.

Description

Technical field [0001] The invention relates to the field of transmission control, in particular to a method for controlling the gear shifting force of a dual-clutch automatic transmission. Background technique [0002] The shift mechanism mainly includes synchronizer and shift fork. The shift process is the process of combining the synchronizer gear sleeve with the gear gear. The synchronizer gear sleeve can mesh with the gear gear through the movement of the shift fork to realize gear shift. ; The entire shift fork movement process needs to provide appropriate gearing force, not only to prevent gear impact and gear noise caused by excessive gearing force, but also to avoid the problem of gearing failure caused by too small gearing force. [0003] The existing shift fork gear force is controlled by an integral algorithm, that is, an initial gear pressure and a gradient of shift pressure change are set, and the shift fork gear force is obtained through the integral algorithm; the g...

AI Technical Summary

Problems solved by technology

[0004] However, although the existing shift fork force control method can complete the gear engagement operation and ensure the combination of gears, due to the small initial value of the pressure, the subsequent pressure continues to increase, resulting in a longer time for some gears to engage gears, resulting in shifting Noise, even causing shift shock

Images