Patent ID: 8292783

Claim:
Method for controlling slippage across a torque converter operative to transmit torque from an internal combustion engine to a torque transmission device, comprising: monitoring a transmission input speed; comparing the monitored transmission input speed to a threshold input speed; when the transmission input speed is less than the threshold input speed, controlling an engine speed based upon a minimum engine speed comprising comparing the engine speed to the minimum engine speed, and controlling actuation of a torque converter clutch device based upon a result of the comparing the engine speed to the minimum engine speed; and when the transmission input speed is greater than the threshold input speed, controlling a relative speed across the torque converter based upon a desired relative speed across the torque converter comprising comparing the relative speed across the torque converter to the desired relative speed across the torque converter, and controlling actuation of the torque converter clutch device based upon a result of the comparing the relative speed across the torque converter to the desired relative speed across the torque converter.