Patent ID: 8857272

Claim:
A method for determining a torque of an electric motor on a motor vehicle, the torque being generated by a rotor of the electric motor, and the torque being transmitted from a drivetrain to at least one drive wheel, the method comprising: measuring a rotation angle of the rotor of the electric motor; determining the torque generated by the rotor; wherein the at least one drive wheel driven by the rotor is fixed, a stationary rotor does not generate any torque, and a first rotation angle of the stationary rotor is measured, and subsequently, wherein a torque is applied by the rotor to the drivetrain, so that the rotor carries out a rotational movement due to the limited stiffness of the drivetrain, and subsequently in an equilibrium state between the torque generated by the rotor and a counter torque of the drivetrain, a second rotation angle of the rotor is measured, and wherein at least one of the torque generated by the rotor and the total stiffness of the drivetrain is ascertained from the measured values of a first rotation angle and a second rotation angle of the rotor.