EP1902290A1 - Element de connexion comportant un element capteur de force - Google Patents

Element de connexion comportant un element capteur de force

Info

Publication number
EP1902290A1
EP1902290A1 EP06760768A EP06760768A EP1902290A1 EP 1902290 A1 EP1902290 A1 EP 1902290A1 EP 06760768 A EP06760768 A EP 06760768A EP 06760768 A EP06760768 A EP 06760768A EP 1902290 A1 EP1902290 A1 EP 1902290A1
Authority
EP
European Patent Office
Prior art keywords
force
measuring element
force measuring
capacitors
capacitor
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Withdrawn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
EP06760768A
Other languages
German (de)
English (en)
Inventor
Andreas Stratmann
Sven Lamers
Klaus Kasten
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1902290A1 publication Critical patent/EP1902290A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01G—WEIGHING
    • G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
    • G01G7/06—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electrostatic action
    • 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
    • G01L1/142—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 using capacitors
    • 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
    • G01L1/142—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 using capacitors
    • G01L1/144—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 using capacitors with associated circuitry

Definitions

  • the invention relates to a force measuring element according to the preamble of the independent claim.
  • a differential capacitor in a force measuring element is known.
  • a middle plate which is designed as a double plate and belongs to two serial interconnected capacitors, depending on the applied force move.
  • a spring is provided in the rod over which the force is applied to this middle plate.
  • Patent claim has the advantage that conventional capacitors can be used and not a special capacitor construction as in the prior art is necessary.
  • the invention is based on the recognition that capacitors deform elastically to a certain force action, ie after the end of the force these capacitors return back to their original shape.
  • a beam is provided in the force measuring element, which separates the two capacitors and is substantially fixed, so that when a force is applied to a sleeve of the force element, an upper space in which the first capacitor is reduced by the force and the second space below The bar increases accordingly.
  • This principle will too called differential capacitor or capacitor with difference principle. This leads to a capacity change which is proportional to the force effect.
  • the force measuring element according to the invention thus allows a very compact design and in particular the force measuring element can be used as a connecting element, ie as a screw or bolt in a seat rod of a motor vehicle seat as a force measuring element.
  • the force exerted on the seat by a vehicle occupant or an object can be determined.
  • Force measuring element is also easier to produce due to its compact design and causes lower production costs.
  • the force measuring element has a component for limiting the force, so that this component prevents a force is exerted on the capacitors to a plastic deformation or to a
  • the capacitors can preferably be installed in the force-measuring element by means of a press fit. This is a particularly easy way of installation.
  • a passage through which an electrical connection to the capacitors is provided.
  • several bushings may be provided to perform a plurality of electrical lines to an evaluation circuit.
  • the evaluation circuit is attached in particular to the head of the force measuring element.
  • the force measuring element is then connected via electrical, optical or radio link to a control unit which transmits the determined force measured values, for example to an airbag control unit.
  • the evaluation circuit of the force measuring element is connected in such a way that a differential evaluation of the capacitances of the capacitors is possible, so that the relative dielectric constant no longer plays a role in the evaluation, so that only enters the change in distance by the force in the capacity change.
  • the beam which can separate the two capacitors, is advantageously integrally connected to the sleeve or integrally connected to the component. This can vary depending on
  • the component itself is designed as a cover of the force measuring element, so that the force measuring element only works if both the component and the remainder of the force measuring element are connected to each other, preferably by a radially circumferential weld.
  • the capacitors can also be designed as multilayer capacitors, which can improve the evaluation or the sensitivity of the measurement signal.
  • the area of the capacitors can improve the evaluation or the sensitivity of the measurement signal.
  • Capacitor increases, with a parallel connection of the layers make up this capacitor.
  • Figure 1 shows a first embodiment of the force element according to the invention
  • Figure 2 shows a second embodiment of the force element according to the invention
  • Figure 3 shows a third
  • Figure 4 is the underlying principle of operation
  • Figure 5 is a multilayer capacitor
  • Figure 6 shows a first embodiment of an evaluation circuit
  • Figure 7 shows a second embodiment of the evaluation circuit.
  • the bolt shape is necessary for maintaining the so-called H-point, which indicates the height at which the hip point of the vehicle occupant is to the vehicle floor. Ie. a substitution of existing elements such. As the bolt in a standard motor vehicle seat must not change the H-point.
  • the force measuring element such that the force measuring element is used as a connecting element and the force acting vertically on the longitudinal side of the force element, so that the bolt or screw application is possible, and that the capacitors are separated by a beam substantially while the force is fixed, so that the space above the beam decreases and increases below the bar.
  • the force measuring element be designed in such a way that the force measuring element can be used as a connecting element and the introduced force acts vertically on the longitudinal side of the force measuring element. Forces in the transverse direction are largely not transmitted to the capacitors due to the unequal ratio of width to height, and thus are not measured.
  • a sole substitution of the existing bolts between the seat and seat rail is possible without thereby both the connection function and the measurement function would be limited.
  • the force measuring element according to the invention is characterized by a simple geometry.
  • a component can be provided which effects a force limitation (see component 2). Ie. If a force above this force limit is introduced into the force-measuring element, then this force is no longer exerted on the capacitors, ie the installation spaces no longer change in their sizes because the component derives this force. So there is a mechanical short circuit.
  • the core of the invention is thus the use of capacities, over which a change in distance can be determined. Corresponding capacities are integrated into the force measuring element such that the main measuring direction in Vehicle Z-direction, ie in the vertical direction shows. The measurement of forces of different orientation is made possible.
  • the measurement principle is chosen so that a minimization of the installation space, in particular the overall length, is made possible that the limitation of acting forces is possible and that the manufacturability is simplified with standard components.
  • a central feature of the sensor is the vertical plate pitch-changing measuring principle.
  • the capacitor plates should be aligned parallel to each other and depending on the load to each other or each other. Ie. the measure d changes, so according to the equation
  • FIG. 4 illustrates this measuring principle.
  • the distance d will decrease, since the sleeve 5 in the direction of
  • Capacitor is pressed. Ie. the capacitor plates 40 move toward each other. Accordingly, the space below the beam 6 increases by the action of force on the sleeve 5. So hereby the press fit of the corresponding capacitor looser, so that the distance d increases there, d. H. the capacitor plates are moving away from each other.
  • FIG. 5 shows an advantageous development. Again, a capacitor between sleeve 5 and bar 6 is inserted in a press fit. Now, however, the capacitor is designed as a so-called multi-layer capacitor or capacitor stack. Several layers are connected in parallel to increase the total capacitor area.
  • FIG. 1 shows a first embodiment of the force-measuring element according to the invention.
  • FIG. 1 shows a side view and correspondingly a front view and a rear view.
  • the side view which is also shown here as a section, shows that force measuring element with a sleeve 5, with a thread 51, the integrally connected to the sleeve 5 bar 6, which is located in the center of the force measuring element, a component 2 for force introduction limiting between the sleeve 5 is centrally inserted as a lid, and capacitors 3, which were inserted in an interference fit between the sleeve 5 and the central beam 6 respectively symmetrical to the center line. Electrical connection line to the capacitors have been omitted herein for the sake of simplicity, but they are by a passage through the
  • a sleeve circle 52 rotates around the force measuring element.
  • An evaluation circuit is provided at the designated point 4. This means the screw or bolt head.
  • Symmetry axis so below the bar 6, in which there is also a capacitor, increases.
  • the force is introduced for the deflection of the lower part of the sleeve 5 via the sleeve circle 52.
  • the force is introduced in point 1, passed on the sleeve circle 52 in the lower part of the sleeve 5 and thus deforms elastically the lower part of the sleeve fifth
  • the capacitors 3 can not deviate from the positions assigned by them, these are inserted in a compressed manner. Ie. the securing of the capacitors 3 takes place via a press fit, between the sleeve 5 and the capacitor 3 and between the capacitor 3 and the cantilevered beam 6.
  • a component 2 is integrated into the structure. By restricting the bar movement, an excessive relative movement between the central cantilever beam 6 and the circular sleeve circle 52 avoided.
  • the electrical connection to the evaluation circuit 4 can be passed through the device 2.
  • the two capacitors 3 are to be evaluated differentially. This means that both signals are included in the output signal at a time.
  • the differential analysis avoids the influence of a changing dielectric constant.
  • Figure 2 shows a second embodiment of the device according to the invention, again rear view, side view and front view is shown.
  • the beam 26 is now part of the device 20, which has the function of limiting the force.
  • the device 20 is flush with the sleeve circle 52 from. Therefore, a joint 7 must be provided between the sleeve circle 52 and the component 20, for example by welding.
  • the variant according to FIG. 2 has the advantage that a greater compensation of the moment about the X-axis is given.
  • FIG. 3 shows a further embodiment of the force-measuring element according to the invention.
  • FIG. 6 shows a first embodiment of an evaluation circuit of the force-measuring element according to the invention.
  • the capacitors Cl and C2 are enabled and are powered by an AC voltage source W. At the center tap between C1 and C2, a line leads to the positive input terminal of an operational amplifier 60 whose negative input is fed back to its output. Between Cl and the AC voltage source, another operational amplifier 61 is connected with its positive input terminal.
  • the output of the operational amplifier 60 is further connected to a resistor R3 which is connected on the other side to a negative input terminal of an operational amplifier 62 and a grounded resistor R4 , Connected to the output of the operational amplifier 61 in addition to the feedback, a resistor R2, which is connected on its other side with a resistor Rl and the positive input terminal of the operational amplifier 62.
  • the resistor Rl is connected on its other side to the output of the operational amplifier 62. At this output, the signal U can be tapped.
  • the circuit allows the differential evaluation of the capacitances, so that the signal U is proportional to the force.
  • FIG. 7 A variant is shown in FIG 7. Again, an AC voltage source W is connected to the series-connected C1 and C2, in turn, at the center tap an operational amplifier 71 is connected, and indeed with its positive input terminal. At the negative input terminal of the operational amplifier 71 is a
  • Rundkopplungs Being provided to its output. Further, connected to an output of the operational amplifier 70 is a resistor R3 which is connected from the other side to a negative input terminal of the operational amplifier 71 and a grounded resistor R4. Between the AC voltage source W and the capacitor Cl, the positive input terminal of an operational amplifier 72 is connected, wherein the negative input terminal is connected to a resistor Rl and a resistor R2, wherein the resistor Rl is connected to ground. The resistor R2 is fed back to the output of the operational amplifier 72. Furthermore, at the output of the operational amplifier 72, a resistor R2 is connected, which on its other side with the positive input terminal for Operational amplifier 71 and the resistor Rl, which in turn is connected to the output of the operational amplifier 71. At the output of the operational amplifier 71, the signal U can be tapped, which in turn is indicative of the force exerted on the capacitors C 1 and C2. Further evaluation circuits are conceivable here, which can also be built up integrally or discretely.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention concerne un élément capteur de force présentant un couplage en série d'au moins deux condensateurs. L'élément capteur de force est conçu de sorte que sous l'effet de l'action d'une force, une première capacité d'un premier condensateur, sur les au moins deux condensateurs, augmente et qu'une seconde capacité d'un second condensateur, sur les au moins deux condensateurs, diminue. L'invention se caractérise en ce que l'élément capteur de force est conçu sous forme d'élément de connexion, dans lequel il est prévu d'introduire une force sur un grand côté (1) d'un manchon (5) de l'élément capteur de force et en ce que les au moins deux condensateurs sont séparés par une barre (6), qui est sensiblement stationnaire lorsque la force est introduite, afin qu'un premier espace d'encombrement se réduise avec le premier condensateur au-dessus de la barre (6), suite à l'introduction de la force et qu'un second espace d'encombrement augmente en dessous de la barre (6).
EP06760768A 2005-07-05 2006-05-24 Element de connexion comportant un element capteur de force Withdrawn EP1902290A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005031345A DE102005031345A1 (de) 2005-07-05 2005-07-05 Kraftmesselement
PCT/EP2006/062589 WO2007003470A1 (fr) 2005-07-05 2006-05-24 Element de connexion comportant un element capteur de force

Publications (1)

Publication Number Publication Date
EP1902290A1 true EP1902290A1 (fr) 2008-03-26

Family

ID=36636461

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06760768A Withdrawn EP1902290A1 (fr) 2005-07-05 2006-05-24 Element de connexion comportant un element capteur de force

Country Status (5)

Country Link
US (1) US7694590B2 (fr)
EP (1) EP1902290A1 (fr)
JP (1) JP5108759B2 (fr)
DE (1) DE102005031345A1 (fr)
WO (1) WO2007003470A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007054027B4 (de) * 2007-11-13 2012-05-10 Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. Vorrichtung und Verfahren zur kapazitiven Kraftmessung
US8794079B2 (en) 2011-11-04 2014-08-05 International Business Machines Corporation Determining magnitude of compressive loading
US11311315B2 (en) * 2020-01-03 2022-04-26 Warsaw Orthopedic, Inc. Multi-plate capacitive assembly for a spinal implant
CN112924074A (zh) * 2021-01-29 2021-06-08 同济大学 一种扇形差动电容式垫片型压力传感器

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GB2123157B (en) * 1982-06-22 1986-10-15 Peter Caleb Frederi Wolfendale Load cells
US4603371A (en) * 1984-10-12 1986-07-29 Rosemount Inc. Capacitive sensing cell made of brittle material
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Also Published As

Publication number Publication date
WO2007003470A1 (fr) 2007-01-11
US20090178493A1 (en) 2009-07-16
JP2009500616A (ja) 2009-01-08
JP5108759B2 (ja) 2012-12-26
DE102005031345A1 (de) 2007-01-11
US7694590B2 (en) 2010-04-13

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