Method for computational determination of the oil temperature in a clutch unit

Method according to one of the preceding claims,

• wherein the determination of the thermal input power to the clutch unit (47) takes place as a function of a speed difference between the input element (41) and the output element (45).

Method according to one of the preceding claims,

• wherein the determination of the thermal input power to the clutch unit (47) takes place as a function of a clutch torque.

Method according to one of the preceding claims,

• wherein the determination of the thermal input power to the clutch unit (47) additionally takes place as a function of an efficiency of a transmission component and/or an oil pump of the clutch unit (47).

Method according to one of the preceding claims,

• wherein the determination of the thermal output power of the clutch unit (47) additionally takes place as a function of the oil temperature (TÖI) to be determined or of a last oil temperature determined.

Method according to one of the preceding claims,

• wherein the determination of the thermal output power of the clutch unit (47) additionally takes place as a function of a coefficient of thermal conductivity of the clutch unit (47).

Method according to one of the preceding claims,

• wherein the oil temperature (TÖI) at a startup of the motor vehicle is set equal to an initial value that depends on the current actuator temperature (TAkt).

Method according to one of the preceding claims,

• wherein the actuator (51) has an electric motor (93), with which the temperature sensor (108) is associated.

Method for controlling a clutch unit (47) for a drive train of a motor vehicle,

• wherein an oil temperature (TÖI) in the clutch unit (47) is computationally determined using a method according to one of the preceding claims, and wherein the clutch unit (47) is controlled as a function of the oil temperature (TÖI) thus determined.