Operating device, vehicle and method for operating a vehicle

1. An operating device for a vehicle, comprising:

a first operating element with which a user can select one of a plurality of main functions of a vehicle, wherein the first operating element is configured to rotate about an axis of rotation, wherein the first operating element has at least one predefined fixed position;

a second operating element with which a user can adjust at least one subfunction of the main function selected with the first operating element, wherein the second operating element is configured to rotate about the axis of rotation; and

an actuator unit comprising a magnetorheological medium, which is coupled to the second operating element and is configured to exert a retaining force on the second operating element on a basis of a viscosity of the magnetorheological medium,

wherein the actuator unit is configured to set the viscosity of the magnetorheological medium on a basis of the main function selected with the first operating element and on a basis of a rotational position of the second operating element.

2. The operating device according to claim 1 , wherein the first operating element has a fixed rotational position for each main function.

3. The operating device according to claim 1 , wherein the first operating element has an indicator element that points to the selected main function.

4. The operating device according to claim 1 , further comprising symbols representing the plurality of main functions are arranged around the first operating element on the operating device, wherein the symbols are printed, illuminated, and/or displayed.

5. The operating device according to claim 1 , further comprising:

a display unit configured to display the subfunctions of the main functions selected with the first operating element.

6. The operating device according to claim 5 , wherein the display unit remains stationary within a circumference of the second operating element.

7. The operating device according to claim 5 , wherein the display unit is located outside the first operating element and the second operating element.

8. The operating device according to claim 1 , further comprising:

a detection device configured to detect a rotational position of the first operating element and the rotational position of the second operating element.

9. The operating device according to claim 8 , wherein the detection device is configured to generate a control signal for controlling the operation of the vehicle using a detected rotational position of the first operating element and the detected rotational position of the second operating element.

10. The operating device according to claim 8 , wherein the actuator unit is configured to set the viscosity of the magnetorheological medium on a basis of the rotational position of the first operating element.

11. The operating device according to claim 1 , wherein the first operating element and the second operating element are concentric and have different radii.

12. The operating device according to claim 1 , wherein the first operating element is configured to be rotated in at least one direction from a single fixed rotational position to switch between the plurality of main functions.

13. The operating device according to claim 1 , wherein the first operating element and the second operating element are coaxially offset along the axis of rotation.

14. A vehicle comprising the operating device according to claim 1 .

15. A method for operating a vehicle comprising:

detecting, by a detection device, a rotational position of a first operating element in an operating device of the vehicle, wherein the first operating element is configured to rotate about an axis of rotation and has at least one predefined fixed position;

adjusting, by an actuator unit, a viscosity of a magnetorheological medium in the actuator unit on a basis of the detected rotational position of the first operating element;

exerting, by the actuator unit, a retaining force on a second operating element of the operating device on a basis of the viscosity of the magnetorheological medium;

detecting, by the detection device, a rotational position of the second operating element in the operating device; and

determining a control signal for controlling the operation of the vehicle on the basis of the detected rotational position of the first operating element and the detected rotational position of the second operating element.

16. The method according to claim 15 , further comprising:

adjusting, by the actuator unit, the viscosity of the magnetorheological medium on a basis of the rotational position of the second operating element.

17. The method according to claim 15 , further comprising:

selecting one of a plurality of main functions of the vehicle based on the rotational position of the first operating element;

adjusting at least one subfunction of the selected main function with the second operating element.

18. The method according to claim 17 , further comprising:

displaying, by a display unit, the at least one subfunction of the main function selected with the first operating element.

19. The method according to claim 15 , further comprising:

pointing, with an indicator element of the first operating element, to the selected main function.

20. The method according to claim 15 , further comprising:

at least one of displaying and/or illuminating symbols representing the plurality of main functions arranged around the first operating element on the operating device.