Method for calibrating a characteristic map of a drive train of a working machine and working machine

A method of calibrating a characteristic diagram (14) for a drive-train (1) of a working machine (2), which includes a brake pedal characteristic (15) of a brake system (11) and a clutch characteristic (16) of a drive clutch (5), and in which an opening point (17) at which the drive clutch (5) is disengaged when a brake pedal of the brake system (11) is actuated as a function of a pedal path (27, 28), and/or a closing point (18) at which the drive clutch (5) is engaged when the brake pedal is released as a function of the pedal path (27, 28), is calibrated, the method comprising:

• determining at least one actual rotational speed profile (19) of the drive-train (1) when the brake pedal is at least one of actuated and released;
• comparing the actual rotational speed profile (19) determined with a stored corresponding target rotational speed profile (20);
• adapting at least one of the opening point (17) and the closing point (18) of the drive clutch (5) in such manner that a deviation of the actual rotational speed profile (19) from the target rotational speed profile (20) is minimized;
• and
• during the determination of the actual rotational speed profile (19), determining a drive output torque, and selecting the characteristic diagram (14) that corresponds to the drive output torque determined and the associated target rotational speed profile (20) from a plurality of characteristic diagrams (14) stored for different drive output torques and target rotational speed profiles (20).