Control device for transmission, control method for transmission, and non-transitory computer-readable medium

A control method for a transmission including a continuously variable transmission mechanism including a primary pulley, a secondary pulley, and an endless annular member, the primary pulley being configured to be input power of a drive source mounted on a vehicle, a secondary pulley being configured to transmit the power to a drive wheel, the endless annular member being wound around the primary pulley and the secondary pulley, the method comprising:

• increasing a rotation speed of the secondary pulley as a torque transmission capacity of a lock-up clutch of a torque converter provided between the drive source and the primary pulley increases, and after the lock-up clutch is engaged, changing a gear ratio of the continuously variable transmission mechanism to a high side or a low side so as to cancel return movement of a drive shaft which has been twisted by the engagement of the lock-up clutch.

A control device for a transmission including a continuously variable transmission mechanism including a primary pulley, a secondary pulley, and an endless annular member, the primary pulley being configured to be input power of a drive source mounted on a vehicle, a secondary pulley being configured to transmit the power to a drive wheel, the endless annular member being wound around the primary pulley and the secondary pulley, wherein

• a rotation speed of the secondary pulley increases as a torque transmission capacity of a lock-up clutch of a torque converter provided between the drive source and the primary pulley increases, and after the lock-up clutch is engaged, the control device changes a gear ratio of the continuously variable transmission mechanism to a high side after the rotation speed of the secondary pulley decreases and before the rotation speed of the secondary pulley increases.