Patent ID: 8229638

Claim:
Method for classifying a clutch unit for a drivetrain of a motor vehicle, wherein the clutch unit comprises at least one friction clutch for a controllable transmission of a torque from an input element to an output element and an actuator for actuating the friction clutch, wherein the clutch unit is controlled on the basis of a predefined characteristic curve which describes a predefined dependency of the friction clutch torque to be transmitted on an actuator control variable, the method comprises the following steps: (a) specifying at least one first and one second value range of the clutch torque to be transmitted; (b) determining at least one first corrective value, wherein firstly a predefined rotational speed difference is set between the input element and the output element, wherein subsequently, at the predefined rotational speed difference, the actuator is set to a value of the actuator control variable which, according to the predefined characteristic curve, corresponds to a nominal value of the clutch torque lying within the first value range, and wherein after the setting of the actuator, an actual value of the clutch torque is detected by measurement, wherein the first corrective value is determined as a function of a deviation between the nominal value and the actual value; (c) determining at least one second corrective value, wherein firstly the actuator is set to a value of the actuator control variable which, according to the predefined characteristic curve, corresponds to a nominal value of a clutch torque lying within the second value range, wherein after the setting of the actuator, a predefined rotational speed difference is set between the input element and the output element, and wherein an actual value of the clutch torque is detected by measurement after the setting of the rotational speed difference, wherein the second corrective value is determined as a function of a deviation between the nominal value and the actual value; and (d) adapting the predefined characteristic curve by means of the first and the second corrective value.