WO2001040028A1 - Siege pour vehicule a moyens de detection du poids - Google Patents

Siege pour vehicule a moyens de detection du poids Download PDF

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Publication number
WO2001040028A1
WO2001040028A1 PCT/EP2000/012067 EP0012067W WO0140028A1 WO 2001040028 A1 WO2001040028 A1 WO 2001040028A1 EP 0012067 W EP0012067 W EP 0012067W WO 0140028 A1 WO0140028 A1 WO 0140028A1
Authority
WO
WIPO (PCT)
Prior art keywords
mat
elastic
elastic mat
vehicle seat
detecting
Prior art date
Application number
PCT/EP2000/012067
Other languages
German (de)
English (en)
Inventor
Ernst Johann Hauer
Aloyse Schoos
Original Assignee
I.E.E. International Electronics & Engineering S.A.R.L.
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 I.E.E. International Electronics & Engineering S.A.R.L. filed Critical I.E.E. International Electronics & Engineering S.A.R.L.
Publication of WO2001040028A1 publication Critical patent/WO2001040028A1/fr

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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
    • A47C31/12—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons
    • A47C31/126—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons for chairs
    • 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
    • B60N2/0025—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 by using weight measurement
    • 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
    • B60N2/70—Upholstery springs ; Upholstery
    • B60N2/7094—Upholstery springs
    • 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
    • B60R21/0152—Passenger detection systems using force or pressure sensing means using strain gauges
    • 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
    • B60N2/0031—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 mounted on the frame
    • 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
    • B60N2210/42—Strain gauges

Definitions

  • the present invention relates to a vehicle seat with integrated weight detection for controlling an airbag system
  • an active passenger restraint system In order to reduce the risk of injury to vehicle occupants in a traffic accident, modern vehicles are increasingly being equipped with an active passenger restraint system.
  • Such an active passenger restraint system generally comprises one or more airbags which are inflated at lightning speed in the event of a vehicle impact and which are inflated by the passenger should absorb the impact of released energy and, if necessary, belt tensioners or the like.
  • the microprocessor must of course be supplied with various parameters relating to the stature and / or seating position of the respective passenger.Such a passenger restraint system must consequently be equipped with a device for determining these parameters
  • a passenger restraint system must consequently be equipped with a device for determining these parameters
  • systems which record the weight of the seat and the passenger who is then seated by force measuring systems between the vehicle seat and the vehicle body, depending on the value of the The seated passenger is classified into one of several different classes and the restraint system is switched to a corresponding operating mode.
  • these systems have the disadvantage that they can be hindered in their accuracy by the supporting forces of a seated passenger and the passengers on the rear seats.
  • the suspension comfort in a vehicle seat is determined by a coarse suspension and a comfort suspension.
  • the coarse suspension is made by steel springs or by elastic elements that are integrated into a seat frame.
  • a foam pad which is responsible for the comfort suspension, rests on these springs or elastic elements.
  • the coarse suspension takes over the big changes in the suspension movements, the foam pad takes over the elastic adaptation to the buttocks of the person sitting.
  • mainly structures with steel springs have been used, which are hooked into the frame of the seat.
  • the steel springs are replaced by elastic mats that support the foam all over.
  • the elastic mats simplify the structure of the seat substructure and, thanks to the large area of the foam pad, allow the use of a thinner foam structure for the comfort suspension.
  • the object of the present invention is to propose an inexpensive motor vehicle seat with simple and reliable weight detection, which is not influenced by external forces acting on the seat.
  • a vehicle seat with a seat base and a seat upholstery the seat base being one Has seat frame and an elastic mat suspended in the seat frame, which serves to support the seat upholstery, and wherein the elastic mat is assigned a means for detecting the load on the elastic mat.
  • a load on the seat by a person sitting in is caused by the foam padding of the seat transferred to the elastic mat
  • Other forces that act on the seat from the outside, e.g. supporting forces of a passenger sitting on the rear seats are not transmitted to the elastic mat by the seat upholstery.
  • only forces that act on the seat surface of the seat ie essentially the weight of the passenger sitting in the seat, are transferred to the mat, the mat experiencing a load corresponding to the force acting on it.
  • the value of the load on the mat can thus be directly related, for example, to the weight force acting on the seat surface and can therefore z Classification of the seated person can be used Since in the present invention the weight force exerted by the passenger in the area of the substructure of the seat, ie below the seat upholstery, is detected, the arrangement of the means for detecting the load on the elastic mat means no loss of comfort for the seat to fear
  • the term "elastic mat” in the present case understands both a mat made of an elastic flat or textile material and a mat made of a flat or textile material which is not elastic per se, in which elastic elements are integrated only that the mat in its entirety has the elastic properties necessary for the suspension properties of the seat.
  • the detection of the load on the elastic mat can be carried out in various ways.
  • the means for detecting the load has at least one force measuring system that between the Seat frame and the elastic mat is arranged with the help of this force measuring system, for example one or more force measuring devices, the tension of the elastic mat can be determined, which is generated by the load of the person sitting in the seat in the mat.
  • This tension is proportional to the weight force acting on the seat, so that a value for the weight force acting on the seat can be calculated from the measured voltage.
  • the passenger sitting in the seat is then classified into one of several categories, each of which corresponds to an airbag mode
  • the elastic mat is suspended at several points in the seat frame and the force measuring system has at least two force measuring devices, the two force measuring devices being arranged at a certain distance from each other at a suspension point of the mat between the seat frame and the elastic mat
  • the force measuring system has at least two force measuring devices, the two force measuring devices being arranged at a certain distance from each other at a suspension point of the mat between the seat frame and the elastic mat
  • the load on the elastic mat is determined in only one direction, that is to say that the force measuring system is only suspended on one edge of the seat frame, for example the front edge running transversely to the direction of travel, between the frame and the elastic mat
  • the force measuring system is designed in such a way that the load on the elastic mat can be detected in two different directions of the seat. This is achieved, for example, in that force measuring devices are suspended between the seat frame and the elastic mat both in the longitudinal direction and in the transverse direction of the seat Design can, when hanging the mat at several points, with the function described above advantageously the single-seat position of the passenger can be determined both in the direction of travel and transversely to this direction
  • the means for detecting the load has at least one means for detecting the elongation of the elastic mat, which is assigned to the elastic mat.
  • the Elongation of the elastic mat is determined, which in turn is directly proportional to the load.
  • a means for detecting the elongation of the elastic mat comprises, in a particularly simple variant, at least one strain gauge which is attached to the mat and directly measures the elongation of the mat or its elongation
  • the means for detecting the strain of the mat comprises a plurality of strain gauges, the individual strain gauges being attached to different places on the mat.
  • Such an arrangement of the strain gauges at different places on the mat means that location-dependent detection is possible averaging the stretch, which in turn enables a determination of the seating position of the passenger in the seat If the passenger is seated in the front area of the seat, for example, the strain gauge arranged in this area of the seat exhibits the greatest stretch of the mat.
  • the means for detecting the load is also preferred in this embodiment designed in such a way that the load on the elastic mat can be detected in two different directions of the seat.
  • strain gauges at different points both in the longitudinal direction and in the transverse direction of the seat the elastic mat are arranged in such a configuration can with the above-described mode of operation the seat position of the passenger can advantageously be determined both in the direction of travel and transversely to this direction.
  • the means for detecting the elongation of the elastic mat comprises at least a pair of mutually associated electrical conductors which are introduced into the elastic mat and / or applied to the elastic mat at a certain distance from one another, and an evaluation circuit to which the two conductors are connected to determine the distance between the two conductors.
  • the distance of the conductors inserted into the mat or onto the mat changes. For example, the distance between two parallel conductors increases when the elastic mat is stretched perpendicular to it, the increase in the distance being proportional to the elongation of the mat.
  • this embodiment is also advantageously designed in such a way that the load or the elongation can be determined in two different directions.
  • the means for detecting the stretching of the elastic mat advantageously comprises at least two pairs of associated electrical conductors, the conductors of a first pair and the conductors of a second pair extending in two different directions of the seat.
  • the individual electrical conductors can also extend in a meandering manner over the surface of the elastic mat.
  • the electrical conductors can be introduced into or onto the elastic mat by any suitable technique. If the elastic mat comprises an elastic textile material, the electrical conductors can, for example, be woven, knitted and / or knitted into the elastic mat. In an alternative embodiment, the electrical conductors are sewn or glued onto the elastic mat.
  • the evaluation circuit preferably determines the distance between the two conductors on the basis of a capacitive and / or inductive coupling between the two conductors.
  • the vehicle seat can preferably comprise means for detecting a sagging angle of the elastic mat at at least two opposite suspension points of the mat.
  • the sag angle here is e.g. understand the angle that the mat spans at its point of suspension with a horizontal plane.
  • the position of the center of gravity of the weight force acting on the mat between the two suspension points can be determined and consequently the seat position of the passenger in this direction can be determined.
  • the relative sitting position with respect to two opposite suspension points can also be determined on the basis of the ratio of the vertical component of the tensile force of the elastic mat at the two opposite suspension points.
  • the vehicle seat comprises means for detecting the vertical component of the tensile force of the elastic mat at at least two opposite suspension points of the mat.
  • Fig. 1 shows a section through a vehicle seat
  • Fig. 2 is a plan view of a seat base of a first embodiment of a
  • FIG. 3 is a plan view of a seat base of a second embodiment of a vehicle seat with weight detection
  • FIG. 4 is a top view of a seat base of a third embodiment of a
  • the seat surface 12 comprises a seat frame 16 into which an elastic mat 18 is suspended as a coarse suspension element.
  • the elastic mat 18 can comprise an elastic flat or textile material or a little elastic material Flat or textile material in which elastic elements such as rubber elements are integrated.
  • the foam pad 20 is made up of a suitable textile material by a seat cover 22 covered in leather
  • Fig. 2 shows a plan view of a seat substructure of a first embodiment of a vehicle seat with weight detection.
  • the elastic mat 18 comprises two separate partial mats 18 ⁇ and 18 2 , which, viewed in the longitudinal direction of the seat, are hung next to one another in the seat frame 16 Partial mats are done in the usual way by hooking the mat into fastening hooks 24 of the seat frame 16
  • the partial mats 18 ⁇ and 18 comprise, for example, a flat or textile material made of a suitable elastic material, such as the thermoplastic elastomer Hytrel® manufactured by the DuPont company.
  • each partial mat can have a comparatively inelastic flat or textile material 26, as shown in FIG Suitable elastic element 28 is assigned such that the partial mats have suitable elastic properties.
  • the elastic element can comprise, for example, a suitably shaped rubber strip into which inelastic flat or textile material 26 is integrated, or which is located on an edge of the inelastic flat or Textile material 26 connects to this.
  • the rubber strip is designed, for example, as a suspension element, in which the inelastic material is suspended and which in turn is suspended in the seat frame 16.
  • the elastic mat 18 is assigned a plurality of means for detecting the stretch of the mat.
  • these are strain gauges 30, which are attached directly to the elastic elements 28 of the elastic mat.
  • the elastic mat 18 or the two partial mats 18 ⁇ and 18 2 are loaded by the weight of a passenger sitting in the seat, the mat or the partial mats expands in proportion to the weight force exerted.
  • the extent of this expansion of the mat can be determined directly by means of the strain gauges 30 and a statement can be made about the weight of the person sitting on the basis of the determined values. It should be noted that by dividing the elastic mat 18 into two partial mats 18 arranged next to one another ! and 18 2 with the device shown in FIG.
  • a force measuring system between the respective partial mats 18 ⁇ and 18 2 and the seat frame 16 can be provided, with which the tension of the elastic mat, which is generated by the load of the person sitting in the seat in the mat, can be detected.
  • the value of the tension measured on the respective force measuring system provides information about the Load on the elastic mat or the respective partial mat, and thus on the weight exerted by the person sitting in it
  • the elastic mat has an elastic element 34, which extends, for example, within a fabric material 26.
  • a plurality of strain gauges 30 are spaced in the longitudinal direction of the seat by means of these strain gauges 30, the extent of the stretching of the mat is measured at the various points and the weight of a seated passenger is determined in the above-described manner Seat and consequently a determination of the sitting position in this direction
  • FIG. 4 shows a device which, analogously, enables the seat position to be determined in the transverse direction of the seat.
  • the elastic mat is hooked into the seat frame in the front and rear region of the seat, and the elastic element 34 extends in the transverse direction the fabric material
  • the strain gauges 30 (only two in the example shown) are also spaced transversely on the elastic element. If an elongation of the elastic mat is determined with this device, conclusions can be drawn from the distribution of the elongation in the two lateral areas of the seat lateral seat position of the passenger are pulled in the seat and an airbag system can be controlled accordingly
  • the elastic mat is hooked into both the front and rear as well as on the two lateral areas of the seat frame.
  • the mat then comprises, for example, several elastic elements, of which at least one extends in the longitudinal and one in the transverse direction.
  • a single appropriately shaped elastic element can also be provided, which gives the mat the required elastic properties in both directions or the mat can be made from an elastic surface or textile material. It is essential in this embodiment, however, that several individually evaluable strain gauges are arranged on the mat, at least two of which are arranged at a certain distance from one another both in the longitudinal and in the transverse direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Seats For Vehicles (AREA)

Abstract

L'invention concerne un siège pour véhicule comportant des moyens de détection du poids. Le siège comprend une substructure et un rembourrage, la substructure présentant un cadre de siège et une natte élastique suspendue dans le cadre, servant de support au rembourrage du siège. Des moyens de détection de la charge de la natte élastique sont associés à cette natte.
PCT/EP2000/012067 1999-12-03 2000-12-01 Siege pour vehicule a moyens de detection du poids WO2001040028A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU90482 1999-12-03
LU90482A LU90482B1 (de) 1999-12-03 1999-12-03 Fahrzeugsitz mit Gewichtserkennung

Publications (1)

Publication Number Publication Date
WO2001040028A1 true WO2001040028A1 (fr) 2001-06-07

Family

ID=19731848

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/012067 WO2001040028A1 (fr) 1999-12-03 2000-12-01 Siege pour vehicule a moyens de detection du poids

Country Status (2)

Country Link
LU (1) LU90482B1 (fr)
WO (1) WO2001040028A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010005391B4 (de) * 2010-01-22 2016-05-12 Scherdel Marienberg Gmbh Vorrichtung zur Sitzbelegungserfassung für Fahrzeugsitze
DE102016202089A1 (de) * 2016-02-11 2017-08-17 Siemens Aktiengesellschaft Fahrzeug, insbesondere Schienenfahrzeug, mit zumindest einem Sitz

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5009827A (en) * 1987-11-13 1991-04-23 General Motors Corporation Process for forming an elastomeric membrane
EP0652131A1 (fr) * 1993-11-08 1995-05-10 Hoover Universal,Inc. Siège de véhicule avec profilés de cadre extrudés
US5573269A (en) * 1993-12-02 1996-11-12 Trw Vehicle Safety Systems Inc. Apparatus and method for sensing and restraining an occupant of a vehicle seat
DE19602087A1 (de) * 1996-01-20 1997-07-24 Bayerische Motoren Werke Ag Vorrichtung zur Sitzbelegungserkennung
US5739757A (en) * 1997-01-30 1998-04-14 Breed Automotive Technology, Inc. Vehicle passenger weight sensor
WO1998041424A1 (fr) * 1997-03-18 1998-09-24 Southwest Research Institute Detecteur de poids permettant de commander le deploiement d'un airbag
US5905210A (en) * 1997-01-09 1999-05-18 Automotive Systems Laboratory, Inc. Villari effect seat weight sensor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5009827A (en) * 1987-11-13 1991-04-23 General Motors Corporation Process for forming an elastomeric membrane
EP0652131A1 (fr) * 1993-11-08 1995-05-10 Hoover Universal,Inc. Siège de véhicule avec profilés de cadre extrudés
US5573269A (en) * 1993-12-02 1996-11-12 Trw Vehicle Safety Systems Inc. Apparatus and method for sensing and restraining an occupant of a vehicle seat
DE19602087A1 (de) * 1996-01-20 1997-07-24 Bayerische Motoren Werke Ag Vorrichtung zur Sitzbelegungserkennung
US5905210A (en) * 1997-01-09 1999-05-18 Automotive Systems Laboratory, Inc. Villari effect seat weight sensor
US5739757A (en) * 1997-01-30 1998-04-14 Breed Automotive Technology, Inc. Vehicle passenger weight sensor
WO1998041424A1 (fr) * 1997-03-18 1998-09-24 Southwest Research Institute Detecteur de poids permettant de commander le deploiement d'un airbag

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"METHOD FOR SENSING OCCUPANT MASS AND POSITION", RESEARCH DISCLOSURE,GB,INDUSTRIAL OPPORTUNITIES LTD. HAVANT, no. 357, 1994, pages 20, XP000425349, ISSN: 0374-4353 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010005391B4 (de) * 2010-01-22 2016-05-12 Scherdel Marienberg Gmbh Vorrichtung zur Sitzbelegungserfassung für Fahrzeugsitze
DE102016202089A1 (de) * 2016-02-11 2017-08-17 Siemens Aktiengesellschaft Fahrzeug, insbesondere Schienenfahrzeug, mit zumindest einem Sitz

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