Method and device for operating an actuating element

1. Method for operating a closing body arranged on a valve and whose position can be moved from an electric motor toward a mechanical stop via a mechanical gear device with the aid of an actuating force acting on the closing body, it being possible to feed the electric motor via an electronic motor driver module, having the following method steps:

controlling the rotational frequency of the electric motor to a constant value using closed loop control,

calculating an estimate for the actuating force,

comparing the estimate with a predetermined limiting value, and

detecting a current position of the closing body for the predetermined limiting value and assigning the detected position to a final position stored in a travel model;

wherein controlling the rotational frequency further comprises controlling the rotation frequency of the electric motor to the constant value using a control signal fed to the motor driver module, and calculating the estimate further comprises calculating the estimate using the control signal.

2. The method as claimed in claim 1 , wherein the rotational frequency of the electric motor is additionally detected and is used in calculating the estimate.

3. The method as claimed in claim 1 , wherein the current value of a battery voltage is detected and is used in calculating the estimate.

4. The method as claimed in claim 1 , wherein the control signal is a pulse width modulated signal.

5. The method as claimed in claim 1 , wherein the control signal has a characteristic that is controllably adjustable through a value range from 0% to 100%.

6. The method of claim 1 , wherein the electric motor is a variable speed motor.

7. An actuating drive assembly having a microcomputer, an electric motor that can be controlled via a motor driver module, and a mechanical gear device configured to be driven by an electric motor, the actuating drive assembly comprising a valve operating drive and configured to

control the rotational frequency of the electric motor to a constant value using closed loop control,

calculate, using a computing module, an estimate for the actuating force exerted on a valve, the computing module stored in the actuating drive,

compare the estimate with a predetermined limiting value, and

detect a current position of the actuating element for the predetermined limiting value and assign the detected position to a final position stored in a travel model.

8. The actuating drive as claimed in claim 7 , further comprising a sensor device, arranged on the gear device which is configured to generate a sensor signal from which the speed or rotational frequency of the electric motor can be determined.

9. The actuating drive as claimed in claim 8 , further comprising a first comparing device configured to generate an error signal from a speed setpoint and a speed signal generated from the sensor signal by a calculation module, and wherein a first control module is configured to generate the control signal using at least the error signal.

10. The actuating drive as claimed in claim 9 , further comprising a second comparing device configured to generate an error signal from a desired position signal and a position signal generated from the sensor signal by the calculation module, and wherein a second control module is configured to generate the speed set point using at least the error signal.

11. The actuating drive as claimed in claim 7 , wherein the actuating drive stores a variable travel model of the actuating element.

12. The actuating drive assembly of claim 7 , further comprising a plunger operably coupled to the mechanical gear device.