Patent ID: 8105205

Claim:
A method for adjusting a torque characteristic curve or a friction coefficient of a friction clutch situated in a hybrid power train between an electric machine and a combustion engine, actuated by a clutch actuator, comprising: adjusting the torque characteristic curve or friction coefficient by a torque transmitted by the friction clutch, the torque being determined when starting the combustion engine by the electric machine, wherein the adjusting step includes the following steps: actuating the friction clutch to crank-start the combustion engine in accordance with an old torque characteristic curve, in such a way that the friction clutch transmits a target torque definitely sufficient to start the combustion engine; detecting a change in speed of the combustion engine; determining an actual clutch torque from the change in engine speed, a moment of inertia and a torque of the combustion engine; and adjusting the old torque characteristic curve or friction coefficient so that the target torque matches an actual torque.