Lock-up clutch control device for vehicle, and lock-up clutch control method

Abstract

In a vehicle equipped with a torque converterhaving a lock-up clutch (), learning control for obtaining a learning value (L_n) on the basis of meet-point information, with which the lock-up clutch () initiates torque transmission, is carried out. When the lock-up clutch () experiences a transition to an engaged state during travel, a meet-point learning control unit () calculates an LU transmission torque estimate on the basis of the difference between the engine torque (engine torque signal value Te) and the torque converter transmission torque (τ·Ne). Excess clutch capacity is detected when the LU transmission torque estimate is greater than an excess capacity determination transmission torque threshold within a prescribed amount of time after an initial pressure (P_n) based on the learning value (L_n) is instructed. When excess clutch capacity is detected, a learning value correction that reduces the learning value (L_n) is carried out.