Method and device for determining a position of an actuating element

Patent metadata

Field	Value
Publication number	US-2019315213-A1
Application number	US-201716469889-A
Country	US
Kind code	A1
Filing date	Dec 13, 2017
Priority date	Dec 19, 2016
Publication date	Oct 17, 2019
Grant date	—

Abstract

The invention relates to a method for determining the position of an actuating element (3) in a positioning system (1), having the following steps: continuously detecting a signal profile of a sensor signal from an acceleration sensor (7) which is fitted to an electric-motor actuating drive (5) of the positioning system (1), in order to detect an acceleration on account of a force excitation by a detent torque and/or an imbalance of a rotor of the electric-motor actuating drive; evaluating the signal profile in order to detect an oscillation; determining the position of the actuating element (3) on the basis of the detection of the oscillation.

First claim

1 . A method for determining a position of an actuating element ( 3 ) in a positioning system ( 1 ), comprising:
continuously detecting a signal profile of a sensor signal of an acceleration sensor ( 7 ) mounted on an electric-motor actuating drive ( 5 ) of the positioning system ( 1 ) to detect an acceleration based on of a force excitation by (a) a detent torque, (b) an imbalance of a rotor of the electric-motor actuating drive, or a combination of both (a) and (b); evaluating the signal profile to detect an oscillation; determining the position of the actuating element ( 3 ) based on the detecting of the oscillation.

2 . The method as claimed in claim 1 , wherein the detecting of the oscillation is taken as a basis for adjusting a counter value, wherein the adjusting of the counter value comprises incrementing and decrementing the counter value based on a direction of rotation, the direction of rotation of the actuating drive ( 3 ) being ascertained by evaluating two sensor signals representing accelerations of the actuating drive in two different directions.

3 . The method as claimed in claim 1 , wherein the acceleration sensor ( 7 ) provides at least two sensor signals indicating accelerations in two radial directions of the rotor of the actuating drive ( 3 ), which act transversely with respect to one another, or in one radial and one tangentially acting direction of the rotor.

4 . The method as claimed in claim 1 , wherein the signal profile for a rotation of the rotor is periodic and has multiple periodicities, a periodicity of lower frequency being used for checking the plausibility of the counter value.

5 . The method as claimed in claim 1 , wherein a signal profile of a sensor signal of an acceleration sensor ( 7 ) is detected for a force excitation in the axial direction of the rotor, the detected signal profile for the axial direction being taken as a basis for determining a direction of rotation of the actuating element ( 3 ).

6 . A control unit ( 6 ) for determining a position of an actuating element ( 3 ) in a positioning system ( 1 ), configured to:
receive a signal profile of a sensor signal of an acceleration sensor ( 7 ) mounted on an electric-motor actuating drive ( 5 ) of the positioning system ( 1 ) to detect an acceleration based on a force excitation by (a) a detent torque, (b) an imbalance of a rotor of the electric-motor actuating drive, or a combination of both (a) and (b); evaluate the signal profile in order to detect a completed oscillation; determine the position of the actuating element ( 3 ) based on the detecting of the completed oscillation.

7 . A positioning system, comprising:
an actuating drive ( 5 ) for driving an actuating element ( 3 ); an acceleration sensor ( 7 ), coupled to the actuating drive ( 5 ), for providing a sensor signal, wherein the acceleration sensor ( 7 ) is mounted on an electric-motor actuating drive ( 5 ) of the positioning system ( 1 ) in order to detect an acceleration based on a force excitation by (a) a detent torque, (b) an imbalance of a rotor of the electric-motor actuating drive, or a combination of both (a) and (b); and a control unit ( 6 ) configured to
receive a signal profile of a sensor signal of an acceleration sensor ( 7 ) mounted on an electric-motor actuating drive ( 5 ) of the positioning system ( 1 ) to detect an acceleration based on a force excitation by (a) a detent torque, (b) an imbalance of a rotor of the electric-motor actuating drive, or a combination of both (a) and (b);
evaluate the signal profile to detect a completed oscillation; and
determine the position of the actuating element based on the detecting of the completed oscillation.

8 . A positioning system according to claim 7 , wherein the acceleration sensor ( 7 ) is arranged on a pole pot of an actuating drive ( 5 ) in the form of an electric motor.

9 . The positioning system as claimed in claim 7 wherein the positioning system is part of a window lifter installation or sliding roof system.

Assignees

• Bosch Gmbh Robert

Inventors

• Depner Dieter

Classifications

• B60J7/223 Primary

  specially adapted for convertible cars · CPC title

• G01P3/48

  by measuring frequency of generated current or voltage {(in general G01R23/00)} · CPC title

• G01D5/12 Primary

  using electric or magnetic means (G01D5/06 takes precedence) · CPC title