Control device and control method for lockup clutch

摘要

A control device for a lockup clutch of a vehicle. A slip control device executes slip control to make a rotational speed difference between the input member and the input shaft match a target slip speed according to a state of the vehicle by half engagement of the lockup clutch. A clutch temperature obtaining means obtains a clutch temperature of the lockup clutch. A determining means determines if the lockup clutch should be fully engaged or disengaged based on at least a state of the motor if the clutch temperature becomes equal to or higher than a predetermined temperature during execution of the slip control. A slip control stop means for stopping the slip control by fully engaging or disengaging the lockup clutch according to the determination result of the determining means.

主权项

1. A control device for a lockup clutch capable of coupling an input member connected to a motor of a vehicle and an input shaft of a transmission device and decoupling the input member and the input shaft, comprising:
slip control means for executing slip control to make a rotational speed difference between the input member and the input shaft match a target slip speed according to a state of the vehicle by half engagement of the lockup clutch; clutch temperature obtaining means for obtaining a clutch temperature of the lockup clutch; determining means for determining if the lockup clutch should be fully engaged or disengaged based on at least a state of the motor if the clutch temperature becomes equal to or higher than a predetermined temperature during execution of the slip control, wherein the determining means determines that the lockup clutch should be fully engaged if an input torque that is transferred from the motor to the input member is larger than a predetermined torque or a rotational speed of the motor is higher than a predetermined rotational speed, and determines that the lockup clutch should be disengaged if the input torque is equal to or smaller than the predetermined torque and the rotational speed of the motor is equal to or lower than the predetermined rotational speed; and slip control stop means for stopping the slip control by fully engaging or disengaging the lockup clutch according to the determination result of the determining means.