EP1535032A1 - Dispositif pour mesurer les masses dans un v hicule - Google Patents

Dispositif pour mesurer les masses dans un v hicule

Info

Publication number
EP1535032A1
EP1535032A1 EP03709650A EP03709650A EP1535032A1 EP 1535032 A1 EP1535032 A1 EP 1535032A1 EP 03709650 A EP03709650 A EP 03709650A EP 03709650 A EP03709650 A EP 03709650A EP 1535032 A1 EP1535032 A1 EP 1535032A1
Authority
EP
European Patent Office
Prior art keywords
seat
ultrasound probe
vehicle
transit time
force
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.)
Ceased
Application number
EP03709650A
Other languages
German (de)
English (en)
Inventor
Michael Munz
Frank Fischer
Gottfried Flik
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 EP1535032A1 publication Critical patent/EP1535032A1/fr
Ceased 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
    • 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
    • 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
    • B60R21/0153—Passenger detection systems using field detection presence sensors
    • B60R21/01536—Passenger detection systems using field detection presence sensors using ultrasonic waves
    • 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
    • G01G9/00—Methods of, or apparatus for, the determination of weight, not provided for in groups G01G1/00 - G01G7/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications

Definitions

  • the invention relates to a device for weight measurement in a falirzeug according to the type of the independent claim.
  • a device for weight measurement in a vehicle is known from DE 199 48 045 A1, the weight being determined by means of strain gauges via the strain of the strain gauge.
  • the device according to the invention for weight measurement in a vehicle with the features of the independent claim has the advantage that the elongation and thus the weight is now determined by means of a transit time measurement, but not by a change in electrical quantities, as in a strain gauge, but by Runtime differences, which are preferably determined using ultrasound pulses. Probes with a small size can be used to measure the transit time. It is still possible to measure the force distribution. The evaluation can be designed robustly.
  • the sensor system uses mechanical waves to measure the transit time. Mechanical waves can spread in particular on solids, but also in liquids or gases and are reflected on separating layers and thus allow easy determination of the elongation over time differences.
  • ultrasonic waves in particular are used as the mechanical waves.
  • Ultrasonic waves enable a particularly sensitive measurement of small elastic strains. Steel bodies, in particular, can thus be measured particularly precisely with regard to their elongation.
  • the pulse-echo method is preferably used for this.
  • the ultrasound frequencies are generated, for example, in a range around 15 MHz in order to then be coupled into the expansion element.
  • the wave propagates longitudinally and transversely and is reflected, for example, from the end face of the expansion element.
  • the difference in transit time between transmitted and received pulses is measured, hence the pulse-echo method.
  • the pulse rate is between
  • the change in the transit time difference is the measure for the elongation of the screw and thus for the weight that is measured.
  • an ultrasound probe is provided on the vehicle seat for this purpose, which can be mechanically coupled to a seat element, so that the weight is transferred to the ultrasound probe and causes the ultrasound probe to expand. This stretch can be done by bending or torsion.
  • the ultrasound probe can preferably be arranged in a seat anchor.
  • the seat element can at least partially form the seat surface or the backrest.
  • FIG. 1 is a schematic illustration which shows the transmission of the seat force to an elongation of an ultrasound probe 2 shows a second representation that describes the transmission of the seat force to torsion of an ultrasound probe and FIG. 3 shows a second representation that shows the transmission of the seat force to torsion of an ultrasound probe in a top view, that is to say in the direction of the force effect.
  • sensors are used to determine the seat force on the individual seats. So far
  • a component made of steel with an integrated ultrasound transmitter is preferably used as the expansion element.
  • a piezoelectric layer, for example made of zinc oxide, aluminum nitride or PZT, is applied to the expansion element as an elastic body.
  • a metal layer is applied to the piezoelectric layer, for example structured with shadow masks or with photolithography, which serves as an electrode.
  • a mechanical wave (ultrasound) is thereby coupled into the expansion element.
  • the wave propagates in the expansion element, specifically as a longitudinal and transverse wave, and is reflected, for example, from the end face of the expansion element.
  • the runtime difference between is measured emitted and received pulses, that is the pulse-echo method, whereby a pulse frequency of approx. 500 to 5000 Hz is used.
  • the change in the transit time difference is a measure of an expansion of the expansion element and thus of the weight that was applied to the seat.
  • FIG. 1 shows schematically the transmission of the seat force to an elongation of an ultrasound probe.
  • the seat force F is applied centrally to a seat element 1.
  • An ultrasound probe 2 is provided under the seat element 1 and also has, for example, lateral reflector notches.
  • This ultrasonic probe 2 is coupled to the seat element 1 via a mechanical coupling 3.
  • the ultrasound probe 2 is held at its other end by means of a mechanical suspension, that is to say a fixed bearing, with electrical control of the ultrasound probe.
  • the ultrasound probe 2 can be firmly clamped at several points.
  • the seat force F is transmitted to the ultrasound probe 2 via the mechanically non-positive connection 3.
  • the ultrasound probe 2 is stretched or compressed by bending.
  • the ultrasound probe 2 thus serves as an expansion element.
  • the uniaxial bend in the direction of the force F can be evaluated using the pulse-echo method, as shown above. To do this, ultrasound pulses from one
  • Ultrasound transmitter generated and coupled into the ultrasound probe 2 which is preferably made of steel.
  • the transit time difference between the injected and received pulses is measured.
  • the length of the probe can be measured via this runtime difference and thus also the elongation in comparison to the normal length.
  • the runtime measurement is carried out here at 15 MHz.
  • a pulse repetition frequency of 1 KHz can be used.
  • a range of 500 to 5 kHz is conceivable.
  • Accurate transit time measurements can be determined to 100 picoseconds.
  • the electrical control 5 has a plausibility algorithm which ensures that 500 of 1000 measured values are transmitted to the control system in an accurate and error-free manner.
  • FIG. 2 shows a further illustration in which the seating force F is caused by a torsion of the
  • Coupling 13 is provided between the seat element 1 and the ultrasound probe 2.
  • a mechanical guide 14 at the other end of the torsion Ultrasound probe necessary.
  • the mechanical coupling between the ultrasound probe 2 and the seat element 1 is designed here in a type of cross member, so that the force F leads to a rotating movement on the ultrasound probe 2 via the mechanical coupling 3, to which the mechanical guide 14 contributes.
  • FIG. 3 now shows a top view of how the arrangement for transmitting the seating force to a torsion of the ultrasound probe 2 is arranged.
  • the top view shows the arrangement in the direction of the force.
  • the seat force F is shown accordingly, the torsion axis being indicated by L and L '.
  • An axle bearing 6 around the ultrasound probe 2 as well as the mechanical coupling 13 and the mechanical guide 14 are necessary for converting the force acting on a torsion on the ultrasound probe.
  • a mechanical clamping 15 with electrical tensioning of the ultrasound probe 2 is also necessary for this torsion probe.
  • the distribution of the seat force over the seat surface or the backrest can be measured using locally attached ultrasound probes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention concerne un dispositif pour mesurer les masses dans un véhicule, ce dispositif comportant un élément d'extension (2) qui s'étire sous l'influence du poids. Une technique sensorielle détermine l'extension par la mesure du temps de propagation, cette mesure se faisant de préférence au moyen d'ultrasons.
EP03709650A 2002-07-17 2003-02-25 Dispositif pour mesurer les masses dans un v hicule Ceased EP1535032A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10232360 2002-07-17
DE10232360A DE10232360A1 (de) 2002-07-17 2002-07-17 Vorrichtung zur Gewichtsmessung in einem Fahrzeug
PCT/DE2003/000588 WO2004017029A1 (fr) 2002-07-17 2003-02-25 Dispositif pour mesurer les masses dans un véhicule

Publications (1)

Publication Number Publication Date
EP1535032A1 true EP1535032A1 (fr) 2005-06-01

Family

ID=30010112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03709650A Ceased EP1535032A1 (fr) 2002-07-17 2003-02-25 Dispositif pour mesurer les masses dans un v hicule

Country Status (4)

Country Link
US (1) US20060108153A1 (fr)
EP (1) EP1535032A1 (fr)
DE (1) DE10232360A1 (fr)
WO (1) WO2004017029A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3029902B1 (fr) 2014-12-15 2018-09-28 Fives Syleps Procede et dispositif d'egrainage de colis.
US10267672B2 (en) * 2016-12-29 2019-04-23 Withings Thin weighing scale using ultrasonic waves and method using same

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3812345A (en) * 1972-04-19 1974-05-21 Honeywell Inc Ultrasonic strain transducing system
US4623029A (en) * 1985-08-22 1986-11-18 Oceanside Electronics Weighing system for vehicles with temperature and inclinometer correction
US5170366A (en) * 1989-10-30 1992-12-08 Frank Passarelli Apparatus for measuring load by propagation of an acoustic wave within a rigid structure
US5205176A (en) * 1990-08-27 1993-04-27 Ultrafast, Inc. Ultrasonic load cell with transducer
US5150620A (en) * 1991-06-19 1992-09-29 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method of recertifying a loaded bearing member
US5237516A (en) * 1991-06-19 1993-08-17 The United States Of America As Represented By The United States National Aeronautics And Space Administration Method of recertifying a loaded bearing member using a phase point
GB9118540D0 (en) * 1991-08-29 1991-10-16 Botham John Load monitoring device
US5461923A (en) * 1994-05-16 1995-10-31 Raymond Engineering Inc. Acoustic transducer, transducerized fastener and method of manufacture
US5663531A (en) * 1995-06-12 1997-09-02 Circuits And Systems Electronic weighing apparatus utilizing surface acoustic waves
US5910647A (en) * 1995-06-12 1999-06-08 Circuits And Systems, Inc. Electronic weighing apparatus utilizing surface acoustic waves
US5750937A (en) * 1996-03-07 1998-05-12 Weigh-Tronix, Inc. Multi-load cell force sensing apparatus
US6354152B1 (en) * 1996-05-08 2002-03-12 Edward Charles Herlik Method and system to measure dynamic loads or stresses in aircraft, machines, and structures
US5991676A (en) * 1996-11-22 1999-11-23 Breed Automotive Technology, Inc. Seat occupant sensing system
US6039344A (en) * 1998-01-09 2000-03-21 Trw Inc. Vehicle occupant weight sensor apparatus
JP2004507755A (ja) * 2000-08-28 2004-03-11 シーティーエス・コーポレーション 乗物座席用のセンサー
AU2001287964A1 (en) * 2000-09-19 2002-04-02 Ims Inc. Vehicle occupant weight estimation apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004017029A1 *

Also Published As

Publication number Publication date
US20060108153A1 (en) 2006-05-25
DE10232360A1 (de) 2004-02-05
WO2004017029A1 (fr) 2004-02-26

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