Patent ID: 7509203

Claim:
A lock-up clutch control device which controls a lock-up clutch provided in a torque converter installed between an engine and a transmission, wherein the lock-up clutch control device changes over between a converter state and a lock-up state of the torque converter according to a differential pressure command value relating to a differential pressure supplied to the lock-up clutch, the lock-up clutch control device comprising: a differential pressure generating device which generates the differential pressure supplied to the lock-up clutch; input torque detection means which detects an input torque to the torque converter; and a controller programmed to: compute a real differential pressure based on the detected input torque upon completion of engagement of the lock-up clutch; compute a learning value relating to a differential pressure deviation, based on a difference between the computed real differential pressure and the differential pressure command value upon completion of the engagement of the lock-up clutch, and store the learning value; correct a present differential pressure command value based on the learning value; and send the corrected differential pressure command value to the differential pressure generating device.