Operating device, steering wheel, motor vehicle and method for operating the operating device

Abstract

An operating device for a motor vehicle, comprising a rotatable operating element (22) and a magnetorheological braking device (30), which comprises a magnetic field source (42), a magnetorheological braking unit (31) for the stop-like braking of a rotary movement of the operating element (22), and a rotation angle sensor (50) for detecting the rotary movement of the operating element (22), wherein the magnetorheological braking unit (31) comprises two brake components (32, 34) rotatable relative to one another, wherein one of the two brake components (32, 34) is connected in a rotationally fixed manner to the rotatable operating element (22) and the other brake component (34) is arranged stationary, wherein a magnetorheological braking chamber (36) provided with a magnetorheological medium (40) is formed between the two brake components (32, 34), and a control unit (60) connected to the magnetic field source (42) and to the rotation angle sensor (50).wherein the magnetic field source (42) is periodically controlled by the control unit (60) such that, in a stop state, the brake unit (31) periodically changes between a closed state and a released state, wherein the direction of rotation of the operating element (22) is detected by the rotation angle sensor (50), wherein the sensor signal of the rotation angle sensor (50) is processed in the control unit (60) and used to control the magnetic field source (42) such that, if the detected direction of rotation deviates from the direction of rotation before the stop state, the magnetic field source (42) is controlled such that the magnetorheological brake unit (31) is adjusted to an open state, wherein the magnetic field source (42) is controlled such that, in the stop state, the magnetic field source (42) is controlled by the control unit (60) such that, before the periodic control of the magnetic field source (42),that the magnetorheological brake unit (31) remains permanently in the closed state for a predefined closing period.,

Claims

[1] Operating device for a motor vehicle, with a rotatable operating element (22), and a magnetorheological braking device (30) comprising a magnetic field source (42), a magnetorheological braking unit (31) for the stop-like braking of a rotary movement of the operating element (22), and a rotation angle sensor (50) for detecting the rotary movement of the operating element (22), wherein the magnetorheological braking unit (31) comprises two brake components (32, 34) rotatable relative to one another, wherein one of the two brake components (32, 34) is connected in a rotationally fixed manner to the rotatable operating element (22) and the other brake component (34) is arranged stationary, wherein a magnetorheological braking chamber (36) provided with a magnetorheological medium (40) is formed between the two brake components (32, 34), and a control unit (60) connected to the magnetic field source (42) and to the rotation angle sensor (50), wherein the magnetic field source (42) is periodically controlled by the control unit (60) such that, in a stop state, the brake unit (31) periodically changes between a closed state and a released state, wherein the direction of rotation of the operating element (22) is detected by the rotation angle sensor (50), wherein the sensor signal of the rotation angle sensor (50) is processed in the control unit (60) and used to control the magnetic field source (42) such that, if the detected direction of rotation deviates from the direction of rotation before the stop state, the magnetic field source (42) is controlled such that the magnetorheological brake unit (31) is adjusted to an open state, characterized by , that the magnetic field source (42) is controlled in such a way that in the stop state, before the periodic control of the magnetic field source (42), the magnetic field source (42) is controlled by the control unit (60) in such a way that the magnetorheological brake unit (31) remains permanently in the closed state for a predefined closing time period. [2] Operating device according to claim 1, characterized by that the closing time can be changed depending on an actuation parameter of the operating element (22). [3] Operating device according to claim 2, characterized by that an actuating speed can be determined from the sensor signal of the rotation angle sensor (50), wherein the magnetic field source (42) is controlled by the control unit (60) in such a way that the predefined closing time depends on the actuating speed. [4] Operating device according to claim 3, characterized bythat the predefined closing time increases with the actuation speed of the operating element (22). [5] Operating device according to one of the preceding claims, characterized by that the predefined closing time is between 50 ms and 400 ms. [6] Operating device according to one of the preceding claims, characterized by that the magnetorheological medium (40) is a magnetorheological fluid or a magnetorheological powder. [7] Steering wheel with an operating device according to one of claims 1 to 6. [8] Steering wheel according to claim 7, characterized by that the rotatable operating element (22) is a thumb roller. [9] Motor vehicle with an operating device (20) according to one of claims 1 to 6. [10] Method for operating an operating device (20) according to one of claims 1 to 6.

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