EP1664703A1 - Dispositif de mesure de force (pour siege) comportant un corps elastique, un capteur inductif et des butees - Google Patents

Dispositif de mesure de force (pour siege) comportant un corps elastique, un capteur inductif et des butees

Info

Publication number
EP1664703A1
EP1664703A1 EP04766721A EP04766721A EP1664703A1 EP 1664703 A1 EP1664703 A1 EP 1664703A1 EP 04766721 A EP04766721 A EP 04766721A EP 04766721 A EP04766721 A EP 04766721A EP 1664703 A1 EP1664703 A1 EP 1664703A1
Authority
EP
European Patent Office
Prior art keywords
measuring device
force
force measuring
housing part
housing
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Withdrawn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
EP04766721A
Other languages
German (de)
English (en)
Inventor
Markus Christoph
Henderikus-L Offereins
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1664703A1 publication Critical patent/EP1664703A1/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Withdrawn legal-status Critical Current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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload

Definitions

  • the invention relates to a force measuring device.
  • the force measuring device has a housing to which two resiliently movable force introduction means are attached.
  • a deflection sensor is mounted between the two force introduction means, which can detect the deflection of the force introduction means and pass it on as an electrical signal.
  • the force measuring device comprises a housing (50) which is composed of a deflectable housing part (56) and a rigid housing part (52), as can be seen from the abstract there and also from FIG. 3.
  • the deflection of the movable housing part (50) is detected by an inductive deflection sensor (52).
  • the object of the present invention is to create a compact and permanently dimensionally stable force measuring device with a sufficiently low spring hardness, the construction of which remains particularly simple and therefore inexpensive.
  • the object is achieved by a force measuring device according to claim 1.
  • the force measuring device comprises a housing with a first housing part and a second housing part, which are connected to one another, as a result of which a cavity is formed within the housing, into which a deflection sensor is introduced.
  • a force introduction means is attached to the first and the second housing part, which are resiliently movable along a common movement axis by the action of an opposite force on the first and second force introduction means.
  • Such an opposite deflection is detected by the deflection sensor and converted into an electrical signal which is led out of the housing and is used, for example, for a central control unit of an occupant protection system in a vehicle as a measure of the weight force acting on the housing.
  • the resilient movement is made possible both by the first housing part and the second housing part, which thereby each represent a first or second spring means of the force measuring device.
  • the two housing parts can each consist of very hard materials, which are also permanently dimensionally stable, for example, over the course of a long vehicle life with a permanent load at their location between the vehicle seat and vehicle chassis remain, but can still be achieved by the factual series connection of the two housing covers as spring means or in other words: the spring spring of the total spring formed is smaller due to the second spring cover connected in series to the first spring cover.
  • the force measuring device can above all be used together with deflection sensors which can detect the relative movement of the force introduction means to one another.
  • the deflection sensor preferably consists of two halves, a first deflection sensor half which is rigidly connected to the first force introduction means and furthermore a second deflection sensor half which is rigidly connected to the second force introduction means.
  • the two deflection sensor halves can be connected to the associated force introduction means in various ways, for example by welding, gluing, and much more.
  • the deflection sensor is preferably arranged along the axis of movement.
  • a suitable deflection sensor is, for example, an inductive sensor, preferably an induction coil, which comprises a core in the first deflection sensor half and a coil winding in the second deflection sensor half.
  • sensors can also be used, for example Hall sensors or magnetoresistive ones Sensors that have long been known from the specialist and patent literature.
  • the two housing parts Since the same forces always act in opposite directions on the two housing parts as spring means in the direction of movement of the force introduction means, the two housing parts must remain dimensionally stable under the effect of force at least up to a minimum requirement limit during their entire service life. In particular, therefore, there should preferably be no unequal material loading due to unequal spring constants of the two housing parts.
  • the spring constants of the two spring means are therefore preferably the same, at least they should not differ too much from one another, in particular not more than 75%.
  • the two housing parts of the force measuring device In order to equip the two housing parts of the force measuring device according to the invention with the lowest possible spring constants, the two housing parts each have a spring lift outside the movement axis of the force introduction means, which is preferably guided perpendicularly away from the movement axis.
  • the entire force measuring device can be made particularly robust and dimensionally stable if as many components of the force measuring device as possible are preferably arranged rotationally symmetrically about the axis of movement. This mainly concerns the housing parts as well as the force application means and the deflection sensor itself.
  • the force measuring device can be manufactured particularly cost-effectively by having as many parts of the force measuring device as possible in one piece, for example the first housing part with the first force introduction means attached to it, or also the second housing part with the second force introduction means attached to it. This also applies, for example, to stop elements that deflect the maximum possible deflection of the first and second housing parts into each Mechanically limit the direction along the movement axis, for example a stop edge within the housing of the force measuring device, which prevents excessive deflection of the two housing parts.
  • FIG. 1 shows a schematic cross section through an exemplary embodiment of a force measuring device (3) according to the invention
  • FIG. 2 shows a schematically represented printed circuit board (11) for electronic components for evaluating the sensor signal of the deflection sensor (40, 50, 51, 52),
  • FIG. 3 shows a schematic cross section through an exemplary embodiment of a force measuring device (3) according to the invention with an integrated stop element (7) as overload protection against material damage to the force measuring device (3),
  • Figure 4 is a schematic perspective view of a force measuring device (3) according to the invention with an overload protection screw (70) and attached outside the housing (1, 2) of the force measuring device (3)
  • FIG. 5 shows a schematic cross section through the illustration in FIG. 4.
  • FIG. 1 shows a cross section through a preferred exemplary embodiment of a force measuring device 3 according to the invention with a housing 1, 2 rotationally symmetrical about a rotation axis 60 drawn in with a broken line, comprising a first housing part 1 and a second housing part 2, which are connected to one another via a connecting means 16 and one
  • the connecting means 16 can be a screw connection, an adhesive bond or, particularly preferably, a circumferential weld connection, since a weld connection is particularly resilient and also adds less weight to the total weight of the force measuring device 3 than a screw connection using screw threads.
  • a first force introduction means 31 is attached to the first housing part 1, in one piece therewith.
  • a second force introduction means 33 is also attached on the outside at the corresponding point of the second housing part 2.
  • Force measuring device 3 attached to a seat rail 20, on which a vehicle seat, not shown, is inserted to move longitudinally.
  • a corresponding screw thread 12 is attached to the outer surface of the second force introduction means 33 in order to connect the force measuring device 3 to the vehicle chassis.
  • the axis of rotation 60 thus also represents the axis of movement 60 of the two force introduction means.
  • the spring action of the first and second housing parts 1, 2 is brought about by sections 102 and 202, each running perpendicularly from the direction of movement 60, which in this way has one circumferential spring per housing part 1, 2.
  • Form lever 102 or 202 At the end of the respective spring lever 102, 202, the two housing parts 1, 2 are bent in a direction parallel to the direction of movement axis 60 such that they converge at their respective ends up to their welded connection 16.
  • the spring action of the lever arms 102 and 202 is reduced to the weld seam 16 by tapering 101 and 201 of the respective wall thickness of the first and second housing part 1, 2 near the direction of movement axis 60 and near the respective bending points of the two lever arms 102 and 202 reinforced.
  • the two housing parts 1 and 2 enclose a cavity.
  • An inductive deflection sensor 40, 50, 51, 52 which consists of two sensor halves, is arranged in the cavity:
  • the first sensor half 50, 51, 52 consists of a deflection sensor sleeve 52, for example made of plastic, which is connected to the inner wall of the first via a welded connection 14
  • Force transmission means 31 is rigidly connected.
  • the deflection sensor sleeve 52 is also rotationally symmetrical about the movement axis 60.
  • a deflection sensor connection means 51 extends into the area of the cavity in the housing 1, 2, which is from the second housing part 2 is encased.
  • a core 50 of an induction coil attached at the end of the deflection sensor connection means 51 there is a core 50 of an induction coil attached.
  • the associated winding 40 of the induction coil is firmly connected to the inner wall of the second force introduction means 33 and surrounds the coil core 50, likewise rotationally symmetrically. It is wound around a coil former 41, which is connected to the second force introduction means 33 via a suitable connecting means 6, preferably in the same way as the deflection sensor sleeve 52 with the first force introduction means 31.
  • the coil former 41 has a circuit board holding surface 42 which extends from the coil former 41 and thus also from the direction of movement axis 60 in the vertical direction into the expanding the cavity. Attached to it is a disk-shaped printed circuit board 11 arranged parallel to it, to which the signals of the induction coil 40 are routed and from which the signals, possibly electronically processed, are led via a connecting line 17 to a plug 19 outside the force measuring device. From the connector 19, these signals are usually forwarded to the central control unit of an occupant protection system for further processing there of the weight signal obtained therefrom.
  • the coil signals are voltage changes on the coil 40 which are generated by the coil core 50 penetrating into the area of the coil winding 40 as soon as the two force introduction means 31, 33 move towards one another or with the opposite signal sign when the two force introduction means 31 and 33 move away from each other.
  • Figure 2 shows the disk-shaped circuit board 11 of Figure 1 in plan view.
  • the central recess 111 serves for the passage of the coil body 41.
  • a connecting element 13 which introduces the signals from the printed circuit board into the feed line 17.
  • the switching elements necessary to process the signal from the coil in the desired manner.
  • FIG. 3 essentially shows a force measuring device 3 like that of FIG. 1.
  • the inductive deflection sensor 40, 50, 51 differs from that shown in FIG. 1: there are therefore more extensive deflection sensor connecting means 51 made of solid material, for example made of sheet steel
  • a suitable magnetic material 50 which analogously to FIG. 1 forms the core 50 of a coil, is applied all around, approximately centrally between the two opposite ends of the two force introduction means 31 and 33.
  • the applied magnetic material is a highly permeable nickel-iron alloy, a so-called MU metal, which is applied to the deflection sensor connection means 51. is steamed.
  • the coil winding 40 is in turn wound around this coil core 50 on a coil former 41 which surrounds the coil core in a rotationally symmetrical manner about the axis of movement.
  • circuit board holding surfaces 42 are attached to the coil body 41 in the same way as in the case of FIG. 1, but in the exemplary embodiment in FIG. 3, the circuit board 11 is fastened to the side of the circuit board holding surface which faces the second housing part 33.
  • housing-integrated stop elements 7 and 8 can also be seen in FIG.
  • the stop element 7 in the inner region of the second housing part 2 is designed as a projection made of the material of the second housing part 2 in the direction of the first housing part 1.
  • This projection 7 there is a step in the material of the deflection sensor connection means 51.
  • the projection 7 is usually formed all around the part of the deflection sensor connecting means 51 which is tapered by the step.
  • the second force introduction means 33 has a taper in the center at its free end, which tapers the inner lateral surface of the second force introduction means 33 in the direction of the interior of the housing. Opposite this taper is the end piece of the deflection connection means 51, which has a parallel taper as the inner jacket of the second force introduction element 33.
  • the tapering angle of the deflection sensor connection means 51 strikes the symmetrical circumferential, corresponding taper of the second force introduction means 33, so that a further deflection in Direction of the first force introduction means 31 is prevented.
  • FIG. 4 shows, in a schematic perspective illustration, a further embodiment of a force measuring device 3 according to the invention, as is known in part similarly from FIGS. 1 and 3.
  • the force measuring device 3 of FIG. 4 has an overload protection screw 70 with a screw head 75 and, at the opposite end of the screw 70, with a screw thread 74.
  • the overload protection screw 70 has a first stop element between its screw head 75 and its thread 74 71 parallel to the screw head 70.
  • the overload protection screw 70 is screwed into a second stop element 72.
  • the stop element 72 is rigidly connected to the second force introduction element 33 via a connecting means 73, for example by a welded connection with a second fastening spacer element 9 which runs in a ring around the second force introduction means 33 and which keeps the second resilient housing part 2 at a distance from the screwing point of the second force introduction means 33 with the vehicle chassis, as can be seen in FIG. 5, which represents a cross-sectional illustration of FIG. 4.
  • Figure 5 also shows that the overload protection screw 70 is guided along its dashed axis of rotation 61 parallel to the axis of movement 60 through a recess in the fastening rail 20, the screw head 75 and the first stop element 71 having a larger parallel surface area than the recess and therefore not through the Recess can be passed. It sticks out therefore only the screw body with the screw thread 74 through the recess and is screwed there to the stop element 72, which likewise has a larger parallel surface extension than the recess through the seat rail 20.
  • the first stop element 71 on the side of the seat rail 20 facing the screw head 75 is kept parallel to it at a distance from the seat rail 20.
  • the second stop element 72 on the side of the seat rail 20 facing away from the screw head is also kept at a distance from the latter.
  • the overload protection screw 70 is rigidly connected to the housing 1, 2 of the force measuring device 3.
  • the force measuring device 3 is rigidly connected to the seat rail 20.
  • the first force introduction means 31 is guided out of the seat rail 20 through a further recess, so that an annular first fastening spacer 10 comes into contact with the seat rail 20 between the seat rail 20 and the first housing part 1, all the way around the first force introduction means 31.
  • the part of the first force introduction means 31 protruding through the recess from the seat rail 20 has a circumferential thread 15, by means of which a screw nut 141 enables the first force introduction means 31 to be firmly screwed to the seat rail, with the side of the seat rail facing away from it 20 the first fastening spacer 10 serves as a counter-holding means.
  • the first fastening spacer 10 also ensures, analogously to the second fastening spacer 9 on the second force introduction means 33, that the elastic deflections of the housing part 1 are not mechanically hampered by the seat rail 20 or the fastening of the force measuring device 3 to the seat rail 20.
  • the overload protection screw 70 is also deflected via the rigid connection 73 until this deflection is stopped by the first stop element 71 of the overload protection screw 70 hitting the fastening rail 20 or when the second stop element 72 is deflected by the deflection of the housing parts 1, 2 and the overload protection screw 70 strikes the fastening rail 20 from the corresponding opposite side. In this way, excessive deflections of the housing parts 1, 2 can be prevented, which could otherwise result in permanent elastic deformations of the housing parts 1, 2.

Landscapes

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

Abstract

Le dispositif selon l'invention comporte deux parties de corps (1, 2) qui servent elles-mêmes d'éléments élastiques et sont montées l'une derrière l'autre, de sorte que la course élastique totale est prolongée. Malgré la force élastique molle obtenue avec ledit corps (1, 2), les parties de corps (1, 2) individuelles peuvent être constituées d'une matière stable de telle sorte qu'elles peuvent conserver longtemps leur forme même lors d'une très forte sollicitation, étant donné qu'elles sont placées entre un siège de véhicule et le châssis du véhicule, ce qui permet de satisfaire aux exigences élevées de qualité imposées dans l'industrie de l'automobile. On évite ainsi le montage complexe en série de ressorts à l'intérieur du corps (1, 2) et le dispositif de mesure de force est donc compact, stable et d'une fabrication bon marché. Une bobine (40) pourvue d'un noyau (50) sert de capteur de déviation inductif. Le dispositif présenté comprend également des éléments de butée (7, 8).
EP04766721A 2003-09-08 2004-09-07 Dispositif de mesure de force (pour siege) comportant un corps elastique, un capteur inductif et des butees Withdrawn EP1664703A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10341334A DE10341334A1 (de) 2003-09-08 2003-09-08 Kraftmessvorrichtung
PCT/EP2004/052061 WO2005026677A1 (fr) 2003-09-08 2004-09-07 Dispositif de mesure de force (pour siege) comportant un corps elastique, un capteur inductif et des butees

Publications (1)

Publication Number Publication Date
EP1664703A1 true EP1664703A1 (fr) 2006-06-07

Family

ID=34305615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04766721A Withdrawn EP1664703A1 (fr) 2003-09-08 2004-09-07 Dispositif de mesure de force (pour siege) comportant un corps elastique, un capteur inductif et des butees

Country Status (4)

Country Link
US (1) US7367228B2 (fr)
EP (1) EP1664703A1 (fr)
DE (1) DE10341334A1 (fr)
WO (1) WO2005026677A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102005010982A1 (de) * 2005-03-03 2006-09-07 Bizerba Gmbh & Co. Kg Kraftmesszelle
DE102006020051A1 (de) 2006-04-26 2007-11-08 Soehnle Professional Gmbh & Co. Kg Kraftmessvorrichtung
DE102007054096A1 (de) 2007-11-13 2009-05-14 Robert Bosch Gmbh Verbindungselement

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DE23506C (de) H. MOHR in Mannheim Centrifugal-Bandbremse
US3625126A (en) * 1969-07-31 1971-12-07 Polaroid Corp Photographic processing apparatus including automatic timer
US4114123A (en) * 1976-12-30 1978-09-12 Texas Instruments Incorporated Circuit breaker
FR2459462A1 (fr) * 1979-06-18 1981-01-09 Testut Aequitas Dynanometre a diaphragmes
DE3142509A1 (de) * 1981-10-27 1983-05-05 Dostmann Gmbh & Co Kg, 6980 Wertheim Barometer
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DE10145369A1 (de) * 2001-09-14 2003-04-17 Siemens Ag Vorrichtung zum Aufnehmen einer auf einen Sitz insbesondere einen Fahrzeugsitz, einwirkenden Kraft
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Also Published As

Publication number Publication date
DE10341334A1 (de) 2005-04-14
US20070028703A1 (en) 2007-02-08
WO2005026677A1 (fr) 2005-03-24
US7367228B2 (en) 2008-05-06

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