Patent ID: 9664277
Date: 2017-05-30
CPC Classifications: F16H

Claim:
1. A control method of a dual clutch transmission for a vehicle, the method comprising: a pre-engagement-instructing step in which a control unit determines a sub-gear stage and a main gear stage based on driving conditions of the vehicle and starts synchro-meshing a synchronizing unit and the sub-gear stage, when the control unit determines that a driving mode of the vehicle is a neutralizing mode; a turn-off intention-determining step in which the control unit determines whether a driver intends to turn off the neutralizing mode based on whether an accelerator pedal in the vehicle is in a tip-in state after the synchronizing unit and the sub-gear stage are started to be synchro-meshed by the control unit in the pre-engagement-instructing step; a gear stage-comparing/determining step that determines whether the sub-gear stage and the main gear stage have been determined to be a same gear stage, when the accelerator pedal in the vehicle has been pressed down and the turn-off intention-determining step determines that the driver intends to turn off the neutralizing mode; a pre-engagement completion-determining step that determines whether the sub-gear stage and the synchronizing unit have been synchro-meshed, when the sub-gear stage and the main gear stage are different in the gear stage-comparing/determining step; a sub-torque-applying step in which the control unit applies torque to a clutch of a first input shaft on which the sub-gear stage is positioned, when the pre-engagement completion-determining step determines that the sub-gear stage and the synchronizing unit have been synchro-meshed; and a main torque-applying step in which, when torque is applied to the clutch of the first input shaft in the sub-torque-applying step, the control unit instructs the synchronizing unit to synchro-mesh with the main gear stage, and when the synchronizing unit and the main gear stage are synchro-meshed, the control unit applies torque to a clutch of a second input shaft on which the main gear-stage is positioned and removes the torque applied to the clutch of the first input shaft.