Abstract: A method for controlling an impeller clutch of a torque converter includes determining a function relating a K-factor of the torque, determining a current engine torque, determining a desired impeller clutch slip, using the function determine the actual impeller speed and thus actual clutch slip, and adjusting the operating state of the impeller clutch to produce the desired impeller clutch slip.

Abstract: A method for controlling an impeller clutch of a torque converter includes determining a function relating a K-factor of the torque, determining a current engine torque, determining a desired impeller clutch slip, using the function determine the actual impeller speed and thus actual clutch slip, and adjusting the operating state of the impeller clutch to produce the desired impeller clutch slip.

Abstract: A multiple speed ratio hydrokinetic transmission for a wheeled vehicle comprising a planetary gear set having two input torque flow paths and a hydrokinetic torque converter having an impeller element connected to one flow path and a turbine element connected to the other flow path; a friction lockup clutch which, under relatively high peed driving conditions, establishes a mechanical torque bypass path for engine torque in parallel with a torque flow path established by the hydrokinetic unit; and an overrunning coupling located between the friction clutch and the turbine element to adapt the transmission for a direct mechanical torque transfer from the vehicle engine to a driven member or a split torque path that is partly mechanical and partly hydrokinetic; provision being made during high speed ratio operation for a regenerative torque distribution between the input elements through the friction clutch and the overrunning coupling thereby providing improved driveline efficiency and improved driveability fo