EP1828524A1 - Capteur a principe de mesure capacitif - Google Patents

Capteur a principe de mesure capacitif

Info

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
Application number
EP05806946A
Other languages
German (de)
English (en)
Other versions
EP1828524B1 (fr
Inventor
Manfred Wagner
Norbert Reindl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Micro Epsilon Messtechnik GmbH and Co KG
Original Assignee
Micro Epsilon Messtechnik GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Micro Epsilon Messtechnik GmbH and Co KG filed Critical Micro Epsilon Messtechnik GmbH and Co KG
Publication of EP1828524A1 publication Critical patent/EP1828524A1/fr
Application granted granted Critical
Publication of EP1828524B1 publication Critical patent/EP1828524B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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

L'invention concerne un capteur à principe de mesure capacitif, servant à détecter l'approche d'un élément diélectrique (5), de préférence d'une partie du corps humain, destiné à être utilisé dans un système anti-pincement. Ce capteur présente un condensateur (20) ainsi qu'une électronique d'évaluation. La variation de la capacité du condensateur (1), provoquée par l'élément diélectrique (5), peut être mesurée. Ce capteur, pouvant établir une distinction entre une partie du corps humain ou un solide et l'eau et/ou l'humidité, est caractérisé en ce que le condensateur (1) peut fonctionner successivement à au moins deux fréquences différentes et/ou à au moins deux rapports cycliques différents en exploitant la différence de comportement de ces éléments dans un champ électrique (4) variable. L'invention concerne également un procédé correspondant.
EP05806946A 2004-12-22 2005-11-24 Capteur a principe de mesure capacitif Expired - Fee Related EP1828524B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004063108 2004-12-22
DE102005013441A DE102005013441A1 (de) 2004-12-22 2005-03-21 Sensor mit kapazitivem Messprinzip
PCT/DE2005/002105 WO2006066524A1 (fr) 2004-12-22 2005-11-24 Capteur a principe de mesure capacitif

Publications (2)

Publication Number Publication Date
EP1828524A1 true EP1828524A1 (fr) 2007-09-05
EP1828524B1 EP1828524B1 (fr) 2010-11-10

Family

ID=35809814

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05806946A Expired - Fee Related EP1828524B1 (fr) 2004-12-22 2005-11-24 Capteur a principe de mesure capacitif

Country Status (7)

Country Link
US (1) US7545154B2 (fr)
EP (1) EP1828524B1 (fr)
JP (1) JP4901755B2 (fr)
CN (1) CN101137814B (fr)
DE (2) DE102005013441A1 (fr)
HK (1) HK1112681A1 (fr)
WO (1) WO2006066524A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012010228B4 (de) 2012-05-24 2019-07-11 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg Kapazitiver Sensor für eine Kollisionsschutzvorrichtung

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DE102005043534B4 (de) * 2005-09-12 2013-07-04 Webasto Ag Einklemmschutzvorrichtung im Kraftfahrzeugbereich
FR2904353B1 (fr) * 2006-07-31 2008-10-03 Peugeot Citroen Automobiles Sa Dispositif anti-pincement pour vitre ou toit coulissant d'un vehicule automobile
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 (ru) * 2011-08-12 2013-02-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Омский государственный педагогический университет" (ОмГПУ) Способ измерения комплексной диэлектрической проницаемости жидких и сыпучих веществ в широком диапазоне частот
DE102011121372A1 (de) * 2011-12-19 2013-06-20 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt Kapazitiver Sensor für eine Kollisionsschutzvorrichtung
CN202417144U (zh) * 2011-12-21 2012-09-05 北京奥特易电子科技有限责任公司 一种电动车窗防夹传感器
EP2757354B1 (fr) * 2013-01-22 2015-09-30 Mettler-Toledo AG Détection de forces électrostatiques
DE102013001066B4 (de) 2013-01-23 2022-01-20 Brose Fahrzeugteile Se & Co. Kommanditgesellschaft, Bamberg Kapazitiver Näherungssensor
CN104268967A (zh) * 2014-09-29 2015-01-07 深圳市爱普特微电子有限公司 基于电容式传感器的安全门禁方法和装置

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GB9400407D0 (en) * 1993-10-18 1994-03-09 Draftex Ind Ltd Movable-window safety device
JPH0984778A (ja) * 1995-09-26 1997-03-31 Terumo Corp 人体容積計及び診断支援システム
DE19610626C2 (de) * 1996-03-19 2003-01-23 Bosch Gmbh Robert Nachlauferfassung von elektrischen Verstellmotoren
EP0924513B1 (fr) * 1997-12-18 2009-11-25 Uster Technologies AG Méthode et appareil pour la mesure de la proportion des solides dans un échantillon
JPH11334359A (ja) * 1998-05-26 1999-12-07 Oki Electric Ind Co Ltd 電動式パワーウインドウの安全装置
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012010228B4 (de) 2012-05-24 2019-07-11 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg Kapazitiver Sensor für eine Kollisionsschutzvorrichtung

Also Published As

Publication number Publication date
US7545154B2 (en) 2009-06-09
DE502005010530D1 (de) 2010-12-23
US20080007274A1 (en) 2008-01-10
JP2008524608A (ja) 2008-07-10
WO2006066524A1 (fr) 2006-06-29
EP1828524B1 (fr) 2010-11-10
CN101137814B (zh) 2012-02-01
DE102005013441A1 (de) 2006-07-06
HK1112681A1 (en) 2008-09-12
CN101137814A (zh) 2008-03-05
JP4901755B2 (ja) 2012-03-21

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