Electric axle drive train, control unit, and computer programme product

A control unit for an electric axle drive train of a motor vehicle, comprising:

• a processor and a memory,
• wherein the control unit is configured to determine mechanical wear of rotatable components located in a torque flux between a rotor of an electric machine and a rotation blocking device in that the control unit generates a control signal which causes the rotation blocking device to be actuated so that the rotation blocking device blocks rotation of at least one shaft located in the torque flux between the rotor and the rotation blocking device, and then the electrical control unit supplies the electric machine with a current strength that increases up to a predefined first current strength threshold value so that an increasing torque acting in a first direction of rotation is applied to the rotor, and then the control unit supplies the electric machine with a current strength that increases up to a predefined second current strength threshold value so that an increasing torque acting in a second direction of rotation is applied to the rotor, wherein, in the control unit, while the electric machine is supplied with current, a current strength and its temporally associated signals, representing a rotational angle position, of a rotational angle sensor are captured and correlated to form an actual wear characteristic curve, which rotational angle sensor is positioned between the rotor and the rotation blocking device, and the actual wear characteristic curve is compared with a target wear characteristic curve stored in the control unit, wherein, in the case of a deviation between the actual wear characteristic curve and the target wear characteristic curve, an output signal representing the deviation is generated by the control unit.

A computer program stored on a machine-readable carrier for:

• generating a control signal which causes a rotation blocking device of an electric machine to be actuated so that the rotation blocking device blocks rotation of at least one shaft located in a torque flux between a rotor of the electric machine and the rotation blocking device, supplying the electric machine with a current strength which increases up to a predefined first current strength threshold value so that an increasing torque acting in a first direction of rotation is applied to the rotor, supplying the electric machine with a current strength which increases up to a predefined second current strength threshold value so that an increasing torque acting in a second direction of rotation is applied to the rotor, capturing a current strength and its temporally associated signals, representing a rotational angle position, of a rotational angle sensor, which is positioned between the rotor and the rotation blocking device, while the electric machine is supplied with current, correlating at least one of the captured current strength and rotational angle position to form an actual wear characteristic curve, and comparing said actual wear characteristic curve with a target wear characteristic curve stored in the control unit, wherein, in the case of a deviation of the actual wear characteristic curve from the target wear characteristic curve, an output signal representing the deviation is generated.