Control device and control method for lockup clutch

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;
• 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.