Method and device for calibrating a clutch, and agricultural towing vehicle

A device for calibrating a selected clutch which, arranged within a drivetrain of an agricultural towing vehicle, is activatable between a closed and an open state, comprising:

• a hydraulic valve for activating the selected clutch between a closed and an open state;
• a rotational speed sensor for detecting a rotational speed of an output shaft, which is connected in terms of drive to the selected clutch on the output side thereof;
• and
• a control unit configured to:
• connect the selected clutch in terms of drive on the drive side to a running drive motor of the agricultural towing vehicle and is connected in terms of drive on the output side to an output shaft;
• define the value of a physical variable bringing about the clutch activation;
• determine a physical variable representing the rotation of the output shaft;
• assign the physical variable representing the rotation of the output shaft to the value of the physical variable bringing about the clutch activation, in order to generate calibration data of the selected clutch depending on the assignment;
• wherein the determining step includes at least one of the following steps:
• separating the output shaft from all drive connections mounted upstream and downstream in the power flow of the drivetrain;
• accelerating the output shaft by being connected in terms of drive to the drive motor and being separated from the drive connections mounted downstream in the power flow of the drivetrain;
• rotating the output shaft at a constant rotational speed;
• and
• decelerate the output shaft by activating a clutch unit following downstream in the power flow of the drivetrain with a defined value of a physical variable bringing about the clutch activation thereof, wherein an output-side torque of the clutch unit is equal to zero.