EP1828524A1 - Sensor using the capacitive measuring principle - Google Patents
Sensor using the capacitive measuring principleInfo
- Publication number
- EP1828524A1 EP1828524A1 EP05806946A EP05806946A EP1828524A1 EP 1828524 A1 EP1828524 A1 EP 1828524A1 EP 05806946 A EP05806946 A EP 05806946A EP 05806946 A EP05806946 A EP 05806946A EP 1828524 A1 EP1828524 A1 EP 1828524A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitor
- sensor
- sensor according
- measurements
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/40—Safety devices, e.g. detection of obstructions or end positions
- E05F15/42—Detection using safety edges
- E05F15/46—Detection using safety edges responsive to changes in electrical capacitance
Definitions
- the invention relates to a sensor with a capacitive measuring principle and to a method for detecting an approaching dielectric medium, preferably for detecting a human body part for use in anti-pinch protection, with a capacitor and evaluation electronics, the change in the capacitance of the medium caused by the medium Capacitor is measurable.
- Capacitive proximity sensors have long been known in practice. They consist of specially designed capacitors whose stray electric field is affected by approaching objects. Non-conductive objects lead to an increase in the capacitance of the sensor due to their relative to the ambient air increased dielectric constant. The capacitance change depends on the distance of the object from the sensor, its position relative to the sensor, its dimension and its dielectric constant. To detect an approaching object, the capacitance of the sensor must be determined, for which purpose all capacitance measuring methods known to the person skilled in the art can be used. In most cases, the sensor is part of a resonant circuit which is detuned by objects approaching or, given suitable dimensioning of the resonant circuit, becomes capable of oscillation only when an object is present in the stray field of the sensor. Specially designed proximity sensors can be used in a particularly advantageous manner in a trapping protection. An example of this is shown in German Offenlegungsschrift DE 102 48 761 A1.
- a human body part in the stray field of a proximity sensor leads to a particularly high measuring effect. However, this not only detects the presence of a human body part, but also water and / or moisture that is in the field of the sensor. This leads to incorrect measurements, especially in rain or fog.
- the present invention is therefore based on the object, a sensor and a method of the type mentioned for detecting an approaching dielectric medium, preferably for the detection of a human body part, such and further, that a secure measurement regardless of environmental influences, especially moisture and / or water, with a simple design is guaranteed.
- the inventive sensor for detecting an approaching dielectric medium solves the above object by the features of claim 1. Thereafter, such a sensor is characterized in that the capacitor with at least two different frequencies and / or at least two different duty cycles can be operated in sequence.
- a method for detecting an approaching dielectric medium is characterized in that the capacitor is operated with at least two different frequencies and / or at least two different duty cycles in sequence.
- the senor is connected to a periodic, temporally variable voltage source and, during the times in which the output voltage supplied by the voltage source is substantially equal to zero, the charge is measured on the sensor. From this charge can be closed on the capacity of the sensor and occurring changes in this capacity can be detected. This clearly detectable entering into the stray field of the sensor dielectric media.
- a duty cycle is understood to mean the quotient of the period duration and the pulse duration of a periodic, time-variable voltage.
- the duration of a pulse refers to that period of time in which a voltage surge with arbitrary time course assumes more than 50% of its amplitude.
- a classification of the dielectric media passing into the stray field of the sensor can be made.
- a group of measurements is carried out, which consists of at least two measurements with at least two mutually different frequencies and / or at least two mutually different duty cycles.
- the period of time for carrying out the measurements is advantageously chosen such that any parameter changes that occur are negligible, for example due to changes in the moisture distribution or temperature influences.
- a group of measurements is repeated periodically.
- FIG. 1 in a schematic representation of the basic structure of a
- FIG. 2 shows a schematic representation of the section A-A from FIG. 1
- Fig. 1 and Fig. 2 show schematically a preferred embodiment of the present invention from various views.
- the capacitor 1 forming the sensor is formed by two spaced-apart wires 2, 3, which are preferably arranged substantially in parallel.
- Wires can be used all comparable conductive structures known to the person skilled in the art, such as, for example, vapor-deposited or glued-on conductor tracks, conductive polymer layers or the like.
- the wires 2, 3 in the seal of a window, a tailgate, a sliding door or similar, motorized moving parts of a motor vehicle are integrated.
- the device according to the invention can be used to protect all electrically, pneumatically, hydraulically or in a comparable manner moving components in which the risk of pinching exists.
- the wires forming the capacitor 2, 3 are preferably applied by a not shown voltage source with a square wave voltage whose frequency is preferably adjustable between 10O kHz and 10 MHz. In principle, even higher frequencies would be conceivable.
- the voltage in their duty cycle is adjustable, wherein the frequency and the duty cycle are preferably independently adjustable.
- a time-varying electrical stray field 4 is generated in the capacitor 1 and in its edge region, the field lines of which are shown in FIGS. 1 and 2.
- this stray field 4 is a schematically illustrated dielectric medium 5, which increases the capacitance of the sensor. This may be, for example, water, moisture, a human body part, a solid such as wood or polyethylene.
- the senor is charged with this square-wave voltage and then, at a certain time interval, the charge on the capacitor is measured.
- the measurements are performed with at least two different frequencies and / or duty cycles of the charging voltage and preferably repeated periodically.
- the capacitance of the sensor is determined and changes in capacitance with respect to values from previous groups of measurements. If these changes are included in all measurements within the current If the group is essentially the same, it is concluded that a human body part and / or a solid is in the immediate vicinity of the sensor. If the changes in all measurements within the current group are different, then it is concluded that there is water and / or moisture in the area of the sensor, for example due to rain and / or wet seals.
Landscapes
- Geophysics And Detection Of Objects (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004063108 | 2004-12-22 | ||
DE102005013441A DE102005013441A1 (en) | 2004-12-22 | 2005-03-21 | Sensor with capacitive measuring principle |
PCT/DE2005/002105 WO2006066524A1 (en) | 2004-12-22 | 2005-11-24 | Sensor using the capacitive measuring principle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1828524A1 true EP1828524A1 (en) | 2007-09-05 |
EP1828524B1 EP1828524B1 (en) | 2010-11-10 |
Family
ID=35809814
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05806946A Expired - Fee Related EP1828524B1 (en) | 2004-12-22 | 2005-11-24 | Sensor using the capacitive measuring principle |
Country Status (7)
Country | Link |
---|---|
US (1) | US7545154B2 (en) |
EP (1) | EP1828524B1 (en) |
JP (1) | JP4901755B2 (en) |
CN (1) | CN101137814B (en) |
DE (2) | DE102005013441A1 (en) |
HK (1) | HK1112681A1 (en) |
WO (1) | WO2006066524A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012010228B4 (en) | 2012-05-24 | 2019-07-11 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg | Capacitive sensor for a collision protection device |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005043534B4 (en) * | 2005-09-12 | 2013-07-04 | Webasto Ag | Anti-trap device in the automotive field |
FR2904353B1 (en) * | 2006-07-31 | 2008-10-03 | Peugeot Citroen Automobiles Sa | ANTI-PINCHING DEVICE FOR A GLASS OR SLIDING ROOF OF A MOTOR VEHICLE |
US8493081B2 (en) | 2009-12-08 | 2013-07-23 | Magna Closures Inc. | Wide activation angle pinch sensor section and sensor hook-on attachment principle |
US9234979B2 (en) | 2009-12-08 | 2016-01-12 | Magna Closures Inc. | Wide activation angle pinch sensor section |
RU2474830C1 (en) * | 2011-08-12 | 2013-02-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Омский государственный педагогический университет" (ОмГПУ) | Method to measure comprehensive dielectric permeability of liquid and loose substances in wide range of frequencies |
DE102011121372A1 (en) * | 2011-12-19 | 2013-06-20 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt | Capacitive sensor for use in collision protecting device of vehicle for detecting object, particularly for detecting snagging or collision at mobile vehicle part, has capacitance measuring unit interconnected with electrode |
CN103174355B (en) * | 2011-12-21 | 2015-10-28 | 北京奥特易电子科技有限责任公司 | A kind of power window anti-pinch sensor and method |
PL2757354T3 (en) * | 2013-01-22 | 2016-03-31 | Mettler Toledo Gmbh | Detection of electrostatic forces |
DE102013001066B4 (en) | 2013-01-23 | 2022-01-20 | Brose Fahrzeugteile Se & Co. Kommanditgesellschaft, Bamberg | Capacitive proximity sensor |
CN104268967A (en) * | 2014-09-29 | 2015-01-07 | 深圳市爱普特微电子有限公司 | Safety entrance guard method and device based on capacitance-type sensor |
CN117388331A (en) * | 2023-10-27 | 2024-01-12 | 福建天成宝得智能科技有限公司 | Capacitive soil humidity detection device and system |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5398547A (en) * | 1989-01-10 | 1995-03-21 | Innovative Dynamics, Inc. | Apparatus for measuring ice distribution profiles |
GB9400407D0 (en) * | 1993-10-18 | 1994-03-09 | Draftex Ind Ltd | Movable-window safety device |
JPH0984778A (en) * | 1995-09-26 | 1997-03-31 | Terumo Corp | Human body volume meter and diagnosis support system |
DE19610626C2 (en) * | 1996-03-19 | 2003-01-23 | Bosch Gmbh Robert | Follow-up detection of electric actuators |
DE59814414D1 (en) * | 1997-12-18 | 2010-01-07 | Uster Technologies Ag | Method and device for determining proportions of solid substances in a test material |
JPH11334359A (en) * | 1998-05-26 | 1999-12-07 | Oki Electric Ind Co Ltd | Safety device for electric power window |
DE19836056A1 (en) * | 1998-08-10 | 2000-02-17 | Bosch Gmbh Robert | Device to detect obstacles to closing of motor-activated roof of open top motor car; has strip-type capacitor sensor placed along top of any windscreen or side window upper members |
DE19854038C2 (en) * | 1998-11-13 | 2003-09-04 | Brose Fahrzeugteile | Device for detecting the adjustment of translationally moved adjustment devices in vehicles |
JP2000329506A (en) * | 1999-05-24 | 2000-11-30 | Yazaki Corp | Capacitance-type nipping detecting sensor structure to be used for closing/opening drive control device |
US6377009B1 (en) * | 1999-09-08 | 2002-04-23 | Harald Philipp | Capacitive closure obstruction sensor |
US6337549B1 (en) * | 2000-05-12 | 2002-01-08 | Anthony Gerald Bledin | Capacitive anti finger trap proximity sensor |
JP2002057564A (en) * | 2000-08-11 | 2002-02-22 | Aisin Seiki Co Ltd | Human body detector |
DE10048146A1 (en) * | 2000-09-28 | 2002-04-11 | Philips Corp Intellectual Pty | Power supply for X-ray generator |
US6864692B1 (en) * | 2002-06-20 | 2005-03-08 | Xsilogy, Inc. | Sensor having improved selectivity |
DE10248761B4 (en) * | 2002-10-18 | 2013-10-02 | Wilhelm Karmann Gmbh | Capacitive measuring sensor and detection device with a capacitive sensor for detecting a pinching situation |
JP2004212344A (en) * | 2003-01-08 | 2004-07-29 | Mitsuba Corp | Object distinguishing device and object distinguishing method |
JP2004219311A (en) * | 2003-01-16 | 2004-08-05 | Omron Corp | Electrostatic capacity sensor, and opening/closing body clipping-in sensing device |
DE10362057B4 (en) * | 2003-02-10 | 2007-09-06 | Ident Technology Ag | Method and device for safeguarding hazardous areas |
DE10324731A1 (en) * | 2003-05-31 | 2004-12-16 | Braun Gmbh | Method and circuit arrangement for the detection of a filling level of a liquid |
-
2005
- 2005-03-21 DE DE102005013441A patent/DE102005013441A1/en not_active Withdrawn
- 2005-11-24 JP JP2007547155A patent/JP4901755B2/en not_active Expired - Fee Related
- 2005-11-24 WO PCT/DE2005/002105 patent/WO2006066524A1/en active Application Filing
- 2005-11-24 EP EP05806946A patent/EP1828524B1/en not_active Expired - Fee Related
- 2005-11-24 CN CN200580048230.4A patent/CN101137814B/en not_active Expired - Fee Related
- 2005-11-24 DE DE502005010530T patent/DE502005010530D1/en active Active
-
2007
- 2007-06-20 US US11/765,612 patent/US7545154B2/en not_active Expired - Fee Related
-
2008
- 2008-07-24 HK HK08108214.5A patent/HK1112681A1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2006066524A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012010228B4 (en) | 2012-05-24 | 2019-07-11 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg | Capacitive sensor for a collision protection device |
Also Published As
Publication number | Publication date |
---|---|
DE502005010530D1 (en) | 2010-12-23 |
US20080007274A1 (en) | 2008-01-10 |
WO2006066524A1 (en) | 2006-06-29 |
JP4901755B2 (en) | 2012-03-21 |
CN101137814B (en) | 2012-02-01 |
JP2008524608A (en) | 2008-07-10 |
EP1828524B1 (en) | 2010-11-10 |
CN101137814A (en) | 2008-03-05 |
HK1112681A1 (en) | 2008-09-12 |
DE102005013441A1 (en) | 2006-07-06 |
US7545154B2 (en) | 2009-06-09 |
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