Sensor system for monitoring surroundings on a mechanical component, and method for actuating and evaluating the sensor system

Patent metadata

Field	Value
Publication number	US-9513321-B2
Application number	US-201113997375-A
Country	US
Kind code	B2
Filing date	Dec 9, 2011
Priority date	Dec 29, 2010
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A sensor system for monitoring surroundings on a mechanical component, includes at least one capacitive sensor element that is attachable to the surface of machines or machine parts, the at least one sensor element being constructed from a layered structure of flexible electrically conductive and electrically insulating plies, electrically conductive potential surfaces of one ply being disposed, laterally spaced apart via insulating plies located therebetween, in such a way that electric field lines form between the conductive potential surfaces and change measurably upon proximity and/or contact of a body or an object. The layered structure of a sensor element has at least two measuring elements operating separately from one another.

First claim

What is claimed is:

1. A sensor system for monitoring surroundings on a mechanical component, comprising:
at least one capacitive sensor element attachable to a surface of the mechanical component and having a layered structure of electrically conductive and electrically insulating plies;
wherein electrically conductive potential surfaces of a selected ply are disposed, laterally spaced apart via insulating plies located therebetween, so that electric field lines form between the conductive potential surfaces of the selected ply and change measurably upon at least one of (i) proximity of the sensor element with one of a body or an object, and (ii) contact between the sensor element and one of the body or the object;
wherein the layered structure of the sensor element has at least two measuring elements configured to operate separately from one another, and
wherein the at least two measuring elements are situated on an insulating layer of the at least one capacitive sensor element.

2. The sensor system as recited in claim 1 , further comprising:
two control units configured to separately control the two measuring elements, the two control units including (i) a first control unit configured to control and evaluate a first one of the measuring elements, and (ii) a second control unit configured to control and evaluate a second one of the measuring elements.

3. The sensor system as recited in claim 2 , wherein the two control units apply control signals to the two measuring elements in chronologically consecutive manner.

4. The sensor system as recited in claim 1 , further comprising:
two evaluation units configured to evaluate measured signals of the at least two measuring elements, wherein the two evaluation units are at least indirectly operatively connected to the mechanical component and apply control to the mechanical component in such a way that operation of the mechanical component occurs only if the signals of the at least two measuring elements are within predetermined limit values.

5. The sensor system as recited in claim 4 , wherein multiple capacitive sensor elements are provided, and wherein at least one capacitive sensor element has a base outline in the shape of one of a triangle or a quadrangle, and wherein the multiple sensor elements are electrically and mechanically connected to one another and form a sensor skin.

6. The sensor system as recited in claim 4 , wherein the at least two measuring elements are electrically separated from one another.

7. The sensor system as recited in claim 6 , wherein the at least two measuring elements are (i) disposed on at least one common layer and (ii) physically separated from one another in the at least one capacitive sensor element.

8. The sensor system as recited in claim 1 , further comprising:
a controller, wherein the at least one capacitive sensor element includes a plurality of capacitive sensor elements and the controller is configured to:
cyclically address the plurality of capacitive sensor elements; and
check whether a change in capacitance with respect to a reference value has taken place in at least one of the plurality of capacitive sensor elements.

9. The sensor system as recited in claim 8 , wherein the addressing is performed such that different ones of the plurality of capacitive sensor elements are addressed in a chronologically successive manner.

10. The sensor system as recited in claim 8 , wherein the addressing is performed such that different ones of the plurality of capacitive sensor elements are addressed simultaneously.

11. The sensor system as recited in claim 8 , wherein the plurality of capacitive sensor elements are linearly concatenated to form a chain, and wherein the controller is configured to send information for activating a selected one of the capacitive sensor elements, the information being forwarded along the chain to the selected capacitive sensor element.

12. The sensor system as recited in claim 11 , wherein the sensor system is configured for a cyclical self-diagnosis for each of the plurality of capacitive sensor elements, in which self-diagnosis each of the plurality of capacitive sensor elements is acted upon by a test voltage or a characteristic signal pattern.

13. The sensor system as recited in claim 1 , wherein the at least two measuring elements are situated so that their detection areas overlap.

Assignees

• Frangen Joachim
• Bosch Gmbh Robert

Inventors

• Frangen Joachim

Classifications

• G06F3/044

  by capacitive means · CPC title

• F16P3/148

  using capacitive technology · CPC title

• G01R27/2605 Primary

  Measuring capacitance (capacitive sensors G01D5/24) · CPC title

• B25J19/06

  Safety devices · CPC title

• G01D5/24

  by varying capacitance · CPC title