EP1053455A1 - Detecteur plan sensible a la pression - Google Patents

Detecteur plan sensible a la pression

Info

Publication number
EP1053455A1
EP1053455A1 EP99907407A EP99907407A EP1053455A1 EP 1053455 A1 EP1053455 A1 EP 1053455A1 EP 99907407 A EP99907407 A EP 99907407A EP 99907407 A EP99907407 A EP 99907407A EP 1053455 A1 EP1053455 A1 EP 1053455A1
Authority
EP
European Patent Office
Prior art keywords
sensor according
switching elements
pressure
tracks
sensitive
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.)
Withdrawn
Application number
EP99907407A
Other languages
German (de)
English (en)
Inventor
Karl Billen
Laurent Federspiel
Edgard Theiss
Reinhard Knecht
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.)
IEE International Electronics and Engineering SA
Original Assignee
IEE International Electronics and Engineering SA
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 IEE International Electronics and Engineering SA filed Critical IEE International Electronics and Engineering SA
Publication of EP1053455A1 publication Critical patent/EP1053455A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01516—Passenger detection systems using force or pressure sensing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
    • B60N2/0024—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement for identifying, categorising or investigation of the occupant or object on the seat
    • B60N2/0027—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement for identifying, categorising or investigation of the occupant or object on the seat for detecting the position of the occupant or of occupant's body part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
    • B60N2/003—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement characterised by the sensor mounting location in or on the seat
    • B60N2/0034—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement characterised by the sensor mounting location in or on the seat in, under or on the seat cover
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
    • G01G19/413—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means
    • G01G19/414—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only
    • G01G19/4142—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only for controlling activation of safety devices, e.g. airbag systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/14—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for operation by a part of the human body other than the hand, e.g. by foot
    • H01H3/141—Cushion or mat switches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2210/00—Sensor types, e.g. for passenger detection systems or for controlling seats
    • B60N2210/40—Force or pressure sensors

Definitions

  • the invention relates to a pressure-sensitive area sensor.
  • Such sensors are used today, for. B. used for occupancy detection, or pressure profile recording in car seats to control the deployment of an airbag. They are placed on a deformable seat upholstery, or integrated into it, and should recognize whether and if so how the seat is loaded. From the determined pressure profile, e.g. derive the height and posture of the person sitting.
  • Known sensors of this type comprise a film-like support structure over the surface of which several pressure-sensitive switching elements are distributed. The latter form the pressure-sensitive areas.
  • a support structure which consists only of strip-shaped connecting tracks which are held together by an outer frame.
  • the pressure-sensitive switching elements are integrated into the strip-shaped, approximately 2 cm wide connecting tracks.
  • the present invention is therefore based on the object of improving the response behavior of the switching elements in the pressure-sensitive area sensors described above.
  • Such a pressure-sensitive surface sensor comprises a two-dimensional support structure, which essentially consists of flexible connecting tracks, as well as several pressure-sensitive switching elements, which are distributed over the surface of the support structure. According to the invention, at least where the 2 '"
  • Support structure is subjected to major three-dimensional deformations, the pressure-sensitive switching elements carried by free-standing approaches on the connecting tracks.
  • the effect of deformations of the support structure on the switching elements in the surface sensors according to the invention is weakened.
  • the switching elements on the free-standing lugs of the connecting tracks are in fact mechanically decoupled from the supporting structure to a certain degree.
  • the two-dimensional support structure can adapt to a three-dimensional contact surface (such as seat upholstery) and to its deformations, without this adaptation causing greater parasitic loads on the switching elements.
  • the switching elements are no longer preloaded by mechanical stresses in the connecting tracks, which are caused by deformations of the support structure. This significantly improves their response behavior.
  • the width of the connecting tracks can be far smaller than the width (or the diameter) of the switching elements.
  • the width of the connecting tracks in the sensor according to the invention is determined solely by their connecting function and not by the dimension of the switching elements.
  • Narrower connecting tracks have a lower resistance to deformation, so that three-dimensional deformations of the supporting structure generate lower mechanical stresses, which can impair the response behavior of the switching elements.
  • a better three-dimensional deformability of the surface sensor naturally also improves the adaptation of the two-dimensional surface sensor to a three-dimensional contact surface.
  • the narrow connecting tracks include deformation loops or deformation arches. These deformation elements additionally improve the deformability of the connecting tracks and thus bring about an even better adaptation of the two-dimensional support structure of the sensor to a three-dimensional contact surface. Since the resistance to deformation of the connecting tracks is thus greatly reduced, the latter do not transmit any significant bending moments or torsional moments which cause parasitic loads in the switching elements.
  • the deformation loops are advantageously each arranged in a connecting path between two approaches, so that a compressive force acting locally on a switching element in a first approach does not cause any mechanical stress on the switching element in the adjacent approach.
  • An arrangement of the deformation element directly in front of an extension ensures that no significant bending and torsional moments are transferred to the extension.
  • the approaches advantageously comprise a head part which carries the switching element and a connecting web which connects the head part to the connecting track.
  • the extension of the connecting web transverse to the connecting direction should preferably be smaller than the corresponding extension of the head part.
  • This tapering of the approach in the area of the connecting web ensures that the connecting web is more flexible than the head part, as a result of which remanent deformations are essentially absorbed by the connecting web and have no significant effects on the switching element.
  • the connecting web of the approach can be transverse to the connecting track, whereby the mechanical decoupling between the head part and connecting track is further improved.
  • the support structure advantageously comprises lattice-shaped ones
  • the grid-shaped support structure also has essentially the same deformability in two vertical directions. In this way, a more uniform adaptation of the surface sensor to a three-dimensional contact surface is achieved.
  • connection lines which are integrated in the connecting tracks.
  • the support structure consists of two foils glued together, connecting lines and switching elements being arranged between the two foils.
  • the area sensor preferably comprises pressure-sensitive resistance sensors which, among other things, under the name "Force Sensing Resistor (FSR)".
  • FSR Force Sensing Resistor
  • Such resistance sensors include, for example, a surface electrode, a surface coated with semiconductor material, which lies opposite the surface electrode, and a spacer The spacer has the effect that the surface electrode and the semiconductor material are not contacted when the switching element is not actuated.
  • the surface electrode of the FSR sensor can be on a first film and the semiconductor material surface on a second film can be applied, the first and second films being separated by a spacer film.
  • An area sensor according to the invention is advantageously used, for example, in a padded seat for occupancy detection or pressure profile recording, the area sensor resting on the padding or being integrated therein.
  • the great flexibility of the support structure and the small width of the connecting tracks ensure improved seating comfort compared to known pressure-sensitive surface sensors. Due to the great flexibility of the support structure and the fact that the individual switching elements are largely mechanically decoupled from one another 5 - -
  • the area sensor is advantageously suitable for recording a pressure profile on three-dimensional areas.
  • Figure 1 a section of an area sensor with several pressure-sensitive areas
  • Figure 1 shows a section of a pressure-sensitive area sensor, as z. B. can be used for occupancy detection, or pressure profile recording in car seats, u.a. to control the deployment of an airbag.
  • the pressure-sensitive area sensor is placed on the seat upholstery or integrated into it. It makes it possible to see whether and where the seat is loaded.
  • a pressure profile can be created for the seat. From this pressure profile, e.g. derive the height and posture of the person sitting, which e.g. are important parameters for intelligent control of the deployment of an airbag.
  • the surface sensor shown comprises a film-like support structure which essentially consists of a plurality of relatively narrow connecting tracks 12 arranged in a lattice shape.
  • These connecting tracks 12 comprise deformation loops 14, or deformation arches 16, which are arranged in such a way that the supporting structure can be deformed three-dimensionally.
  • the support structure can adapt to the profile of a three-dimensional surface.
  • Pressure-sensitive switching elements 18 are outside the connecting tracks
  • Such an approach 20 advantageously includes a head part 22, which
  • Switching element 18 carries, as well as a connecting web 24, which connects the head part 22 with a connecting track 12. Note that the expansion 6 ' "
  • the connecting web 24 transverse to the connecting direction is smaller than the corresponding extension "B" of the head part 22.
  • the connecting web 24 is more flexible in the connecting direction than the head part 22.
  • the width of the connecting tracks "c" is also substantially smaller than the extension "B” of the head part 22.
  • the deformation elements 14, 16 between adjacent lugs 20, the latter so to speak mechanically decouple from one another.
  • the switching elements 18 can lie largely on a three-dimensional contact surface without large bending moments or torsional moments being generated in the supporting structure, which lead to a preloading of the switching elements 18.
  • the switching elements 18 are preferably sensors which, among other things. under the name "Force Sensing Resistors (FSR)" are known. These “FSR” include in a known manner e.g. a surface electrode (e.g. a graphite or silver electrode), a counter surface coated with semiconductor material, which is opposite the surface electrode, and a spacer. The spacer has the effect that the surface electrode and the semiconductor material are not contacted when the switching element is not actuated. However, if a pressure force acts on such an FSR, its surface electrode is brought into contact with the semiconductor material surface. The contact resistance decreases with increasing pressure.
  • FSR Force Sensing Resistors
  • connection lines of the switching elements 18 are designated in FIG. 1 by the reference number 26. These connecting lines 26 are integrated in the connecting tracks and connecting webs, the lattice structure of the connecting tracks 12 allowing the switching elements 18 to be connected in a matrix. It should be noted that, for the sake of simplicity, the connecting lines 26 in FIG. 1 are only shown schematically as a single dashed line. In practice, of course, several parallel connecting lines 26 run through a connecting path, via which the switching elements 18 can each be individually connected to an electronic evaluation system. 7 '"
  • the sensor shown in FIG. 1 with FSR sensors comprises a support structure which consists of three foils laminated on top of one another with good flexibility and insulation properties.
  • the middle film forms the spacer for the FSR sensors.
  • it has a hole in each head part 22 which corresponds to the active zone of the respective FSR sensor.
  • the electrodes with their connecting lines, or the semiconductor surfaces with their connecting lines, are each applied to the side of the two outer films facing the middle film. It remains to be noted that the lattice structure described above is punched out of the fully bonded "sandwich film".
  • the surface sensor described above is placed on a seat upholstery, it can be adapted excellently to the three-dimensionally deformable support surface by the narrow connecting tracks 12 and the deformation elements 14, 16. This results in deformations of the connecting tracks 12 almost exclusively in the area of their deformation elements. However, due to the low resistance to deformation of the connecting tracks, these deformations do not produce any significant bending moments or torsional moments in the supporting structure, which would lead to parasitic loads in the switching elements 18 in their free-standing lugs 20. Of course, the excellent deformability of the support structure also improves seating comfort.
  • the pressure-sensitive area sensor described above can of course also be used in other areas for recording pressure profiles.
  • Another application is e.g. the pressure profile recording of feet in shoes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention concerne un détecteur plan sensible à la pression, présentant une structure support bidimensionnelle, constituée essentiellement de tracés de raccordement souples (12), et plusieurs éléments de commutation sensibles à la pression (18). Ces derniers sont supportés par des éléments (20) faisant saillie par rapport aux tracés de raccordement (12), au moins dans les zones où la structure support est soumise à des déformations tridimensionnelles plus importantes.
EP99907407A 1998-01-30 1999-01-23 Detecteur plan sensible a la pression Withdrawn EP1053455A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
LU90209 1998-01-30
LU90209A LU90209B1 (de) 1998-01-30 1998-01-30 Drucksensibler Flaechensensor
PCT/EP1999/000443 WO1999039168A1 (fr) 1998-01-30 1999-01-23 Detecteur plan sensible a la pression

Publications (1)

Publication Number Publication Date
EP1053455A1 true EP1053455A1 (fr) 2000-11-22

Family

ID=19731737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99907407A Withdrawn EP1053455A1 (fr) 1998-01-30 1999-01-23 Detecteur plan sensible a la pression

Country Status (3)

Country Link
EP (1) EP1053455A1 (fr)
LU (1) LU90209B1 (fr)
WO (1) WO1999039168A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU90578B1 (de) * 2000-05-05 2001-11-06 Iee Sarl Sensormatte fuer Fahrzeug
DE10039774C1 (de) * 2000-08-16 2002-01-24 Bosch Gmbh Robert Verfahren zur Vermessung einer Sitzmatte für einen Fahrzeugsitz
JP4595267B2 (ja) 2001-08-29 2010-12-08 アイシン精機株式会社 感圧スイッチ
DE10144877A1 (de) 2001-09-12 2003-04-03 Bosch Gmbh Robert Sensor zur Sitzbelegungserkennung
EP1457391A1 (fr) * 2003-03-10 2004-09-15 IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. Système de détection de l'occupation d'un siège
EP1492136A1 (fr) * 2003-06-23 2004-12-29 IEE International Electronics & Engineering S.A.R.L. Capteur de pression du type à feuilles
FR2870488B1 (fr) * 2004-05-21 2006-08-25 Faurecia Sieges Automobile Siege de vehicule automobile comportant un composant souple fixe sur une matelassure du siege, sous la coiffe de garnissage
FR2870798B1 (fr) * 2004-05-27 2006-11-03 Faurecia Sieges Automobile Siege de vehicule automobile commportant une nappe souple adaptee sur une matelassure du siege, sous la coiffe de garnissage
US7362225B2 (en) * 2004-11-24 2008-04-22 Elesys North America Inc. Flexible occupant sensor and method of use
EP1787871B1 (fr) 2005-11-22 2008-12-10 IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. système de détection capacitive de l'occupation d'un siège
EP1821088A1 (fr) 2006-02-16 2007-08-22 IEE International Electronics & Engineering S.A.R.L. Mât de détection de la pression
DE102011107008A1 (de) 2011-07-09 2013-01-10 Volkswagen Aktiengesellschaft Körpermassenabhängige Sitzheizungsregelung eines Sitzteiles und einer Rückenlehne eines Fahrzeugsitzes
CN110171383B (zh) * 2019-06-05 2020-06-26 辽宁尚泽电子科技有限公司 一种汽车安全气囊的多级控制系统及方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993014386A1 (fr) * 1987-11-05 1993-07-22 Kikuo Kanaya Capteur a effleurement du type a repartition
DE4237072C1 (de) * 1992-11-03 1993-12-02 Daimler Benz Ag Resistiver Foliendrucksensor
US5323650A (en) * 1993-01-14 1994-06-28 Fullen Systems, Inc. System for continuously measuring forces applied to the foot

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9939168A1 *

Also Published As

Publication number Publication date
WO1999039168A1 (fr) 1999-08-05
LU90209B1 (de) 1999-08-02

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