Patent ID: 8506453

Claim:
A method of operating a torque-transmitting system, wherein the torque-transmitting system has an input side coupled to an output shaft of a drive unit and an output side coupled to an input shaft of a transmission and a torque flux runs from the drive unit via the torque-transmitting system to the transmission, the torque-transmitting system including: a hydrodynamic torque converter via which a hydraulic path of the torque flux runs; a lockup clutch disposed functionally in parallel with the torque converter and via which a mechanical path of the torque flux runs; and a control unit configured to control a distribution of the torque flux between the hydraulic path and the mechanical path for setting a predetermined overall torque profile at the input shaft of the transmission; the method which comprises the following method steps, to be carried out by the control unit: determining a torque currently being transmitted by the lockup clutch; comparing the torque thus determined with a predetermined setpoint overall torque and calculating a corresponding difference torque; determining a current output speed of the torque converter; calculating a setpoint input speed of the torque converter that would be necessary at the output speed thus determined to transmit the difference torque via the hydraulic path; and setting the output speed of the drive unit to the calculated input speed or a value corresponding thereto.