Control device

A control device controlling a lockup clutch interposed between a drive source and an automatic transmission mechanism of a vehicle, wherein the control device comprises:

• a control part, supplying hydraulic pressure to the lockup clutch and controlling differential pressure of the lockup clutch, wherein
• the control part is configured to:
• supply the hydraulic pressure to the lockup clutch so that the differential pressure is lower than a reference differential pressure in a disengaged state of the lockup clutch;
• and
• in a case of shifting the lockup clutch from the disengaged state to an engaged state, supply the hydraulic pressure to the lockup clutch so that the differential pressure increases as a filling ratio of an oil passage of the lockup clutch decreases, wherein
• the reference differential pressure is a lower limit of the differential pressure that increases a slip ratio of the lockup clutch, or a lower limit of the differential pressure that reduces a slip amount of the lockup clutch.