Method for checking a steer-by-wire steering system, steering system, and vehicle

A steer-by-wire steering system comprising:

• a steering device connected to vehicle wheels,
• a steering wheel,
• an actuator configured to exert a torque on the steering wheel via a mechanical coupling, and
• a control unit configured such that:
• in a control step, the actuator is controlled by the control unit such that a steering wheel angle correlates with a desired angle, and the control unit is configured to determine a temporal progression of a state variable of at least one of the steering wheel and the actuator, and controlling of the actuator depends on:
• i) a difference between the steering wheel and the desired angle, and ii) a rate of change over time of the steering wheel angle;
• in an analysis step, the control unit determines a frequency spectrum of the temporal progression of the state variable and determines an amplitude of a predefined spectral component of the frequency spectrum;
• and
• in a classification step, of the control unit classifies a state of the mechanical coupling is carried out based on the amplitude of the predefined spectral component;
• and
• in an adjustment step:
• i) a control parameter for the controlling of the actuator is adjusted based on the amplitude of the predefined spectral component, and the control parameter is a first amplification factor configured to amplify the difference between the steering wheel angle and the desired angle, and ii) a second amplification factor for the controlling of the actuator is adjusted based on the rate of change over time of the steering wheel angle.

A method for checking a steer-by-wire steering system, the steering system comprising a steering device configured to be connected to vehicle wheels, a steering wheel, an actuator configured to exert a torque on the steering wheel via a mechanical coupling, and a control unit configured to adjust a steering wheel angle of the steering wheel to correlate with a steering angle of the steering device via controlling of the actuator, the method comprising:

• controlling, in a control step, the actuator of the steering wheel so that the steering wheel angle is correlated with a desired angle and a temporal progression of a state variable of the actuator is determined;
• determining, in an analysis step, a frequency spectrum of the temporal progression of the state variable and an amplitude of a predefined spectral component of the frequency spectrum, the predefined spectral component corresponding to a state of the mechanical coupling;
• and
• classifying, in a classification step, a state of the mechanical coupling based on the amplitude of the predefined spectral component.