Method and device for determining the absolute position of a component of an actuator rotating about a rotational axis, in particular a clutch actuator
The invention relates to a method for determining the absolute position of a component of an actuator rotating about a rotational axis, in particular a clutch actuator, wherein the component has a co-rotating magnetic element ( 18 ), and the absolute position of the magnetic element ( 18 ) is detected by way of a multi-turn sensor ( 16 ) located opposite the magnetic element ( 18 ), which is supplied with a voltage. In a method, in which the absolute position can be detected without great constructional effort, a position of the magnetic element ( 18 ) is monitored by a Wiegand wire unit ( 19 ), which detects a movement of the component when the actuator ( 3, 12, 13 ) is turned off, and if a movement is detected, transmits a voltage pulse to the multi-turn sensor ( 16 ) for measuring the current position of the component.
1. A method for determining an absolute position of a component of an actuator rotating about a rotational axis, wherein the component comprises a rotating magnetic element, the method comprising:
providing a multi-turn sensor opposite to the rotating magnetic element configured to determine the absolute position of the magnetic element;
supplying a voltage to the multi-turn sensor;
monitoring a position of the magnetic element, by a Wiegand wire unit, which detects a movement of the component when the actuator is switched off;
supplying the multi-turn sensor with voltage by a battery when the actuator is switched off and the multi-turn sensor is in a standby state;
in the event of detected motion, transferring a voltage pulse from the Wiegand wire unit directly to the multi-turn sensor for measuring a current position of the component; and
changing the multi-turn sensor from the standby state to an operating state after receiving the voltage pulse transmitted from the Wiegand wire unit.
2. The method as claimed in claim 1 , further comprising the multi-turn sensor measuring and storing the current position of the component and then returning to the standby state.
3. The method as claimed in claim 1 , further comprising triggering the voltage pulse by the Wiegand wire unit when the position of the magnetic element has changed by at least 180°.
4. The method as claimed in claim 1 , further comprising that when the actuator is switched on, supplying the multi-turn sensor with voltage by a supply voltage of a control unit and determining at least one of an angle of the component or rotations of the component by the multi-turn sensor.
5. A device for determining an absolute position of a component rotating about a rotational axis of an actuator, the device comprising:
a multi-turn sensor configured to determine the absolute position of the component which comprises a magnetic element that follows a rotational movement of the component;
a Wiegand wire unit configured to monitor the position of the magnetic element, the Wiegand wire unit is connected to a wake-up connection of sensor electronics of the multi-turn sensor in a standby state and is adapted to change the multi-turn sensor to an operating state by transferring a voltage pulse directly to the multi-turn sensor; and
a battery configured to supply the multi-turn sensor with voltage when the actuator is switched off and the multi-turn sensor is in the standby state.
6. The device as claimed in claim 5 , wherein when in the operating state the multi-turn sensor is connected to a supply voltage of a control unit.
7. The method of claim 1 , wherein the actuator is a clutch actuator.
8. The device of claim 5 , wherein the actuator is a clutch actuator.
9. A method for determining an absolute position of a rotating component of an actuator that rotates about a rotational axis, the method comprising:
providing a magnetic element on the rotating component;
providing a multi-turn sensor opposite to the magnetic element, the multi-turn sensor being configured to determine the absolute position of the magnetic element
supplying a voltage to the multi-turn sensor via a battery when the actuator is switched off and the multi-turn sensor is in a standby state;
monitoring a position of the magnetic element, using a Wiegand wire unit, which detects a movement of the component when the actuator is switched off;
upon detecting a motion, the Wiegand wire unit transferring a voltage pulse to a wake-up connection of the multi-turn sensor for measuring a current position of the component; and
changing the multi-turn sensor from the standby state to an operating state after receiving the voltage pulse transmitted from the Wiegand wire unit.
10. The method of claim 9 , further comprising the multi-turn sensor measuring and storing the current position of the component and then returning to the standby state.
11. The method of claim 9 , further comprising triggering the voltage pulse by the Wiegand wire unit when the position of the magnetic element has changed by at least 180°.
12. The method of claim 9 , further comprising the Wiegand wire unit switching on the actuator, supplying the multi-turn sensor with voltage by a supply voltage of a control unit, and determining at least one of an angle of the component or rotations of the component using the multi-turn sensor.