Drive for motor-vehicle accessory
A drive for a motor-vehicle accessory has a drive motor, a controller that regulates the drive motor, and a sensor associated with the drive motor and that measures the motor speed of the drive motor and transmits to the controller a signal having a pulse rate corresponding to the motor speed. A pulse-rate modifier between the sensor of the drive motor and the controller serves to modify the pulse rate received from the drive motor in such a way that this rate is within a range of the pulse rate processable by the controller and to transmit a modified value of the pulse rate to the controller.
1. A drive for a motor-vehicle accessory comprising:
a drive motor;
a controller that regulates the drive motor;
a sensor associated with the drive motor and that measures the motor speed of the drive motor and transmits to the controller a signal having a pulse rate corresponding to the motor speed; and
a pulse-rate modifier between the sensor of the drive motor and the controller that
modifies the pulse rate received from the drive motor in such a way that this rate is within a range of the pulse rate processable by the controller, and
transmits a modified value of the pulse rate to the controller.
2. The drive according to claim 1 , wherein the pulse-rate modifier is an electronic component.
3. The drive according to claim 1 , wherein the pulse-rate modifier is a frequency divider.
4. The drive according to claim 1 , wherein the pulse-rate modifier is an electronic controller.
5. A displacement device comprising a component for a motor-vehicle accessory and a support, wherein the component can be moved relative to the support by a drive according to claim 1 .
6. A head restraint with a head part mounted by at least one support rod in at least one bearing on a seat back of a vehicle seat, the head part being displaceable relative to the seat back, wherein
the head part and the seat back form a displacement device for moving the head part relative to the seat back,
the head part is a component and the seat back is a support, and
the head part can be moved relative to the seat back by a drive according to claim 1 .