WO1997006981A2 - Procede permettant de verifier un dispositif de securite pour occupants d'un vehicule - Google Patents

Procede permettant de verifier un dispositif de securite pour occupants d'un vehicule Download PDF

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Publication number
WO1997006981A2
WO1997006981A2 PCT/DE1996/001438 DE9601438W WO9706981A2 WO 1997006981 A2 WO1997006981 A2 WO 1997006981A2 DE 9601438 W DE9601438 W DE 9601438W WO 9706981 A2 WO9706981 A2 WO 9706981A2
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WO
WIPO (PCT)
Prior art keywords
squib
test current
reference resistor
resistance
resistance value
Prior art date
Application number
PCT/DE1996/001438
Other languages
German (de)
English (en)
Other versions
WO1997006981A3 (fr
Inventor
Werner Nitschke
Wolfgang Drobny
Otto Karl
Jochen Seibold
Michael HOFSÄSS
Michael Ulmer
Dietmar KÖHLER
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
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Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1997006981A2 publication Critical patent/WO1997006981A2/fr
Publication of WO1997006981A3 publication Critical patent/WO1997006981A3/fr

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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
    • B60R21/017—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including arrangements for providing electric power to safety arrangements or their actuating means, e.g. to pyrotechnic fuses or electro-mechanic valves
    • B60R21/0173—Diagnostic or recording means therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line

Definitions

  • the invention is based on a method for checking a safety device for vehicle occupants according to the preamble of claim 1 or on a device for carrying out the method according to the preamble of claim 2.
  • a safety device for vehicle occupants is, for example, from the journal 1141 engineers de 1 'automobiles (1982) No. 6, page 69 ff, in particular FIG. 19 on page 74.
  • Safety device comprises so-called squibs, which are controlled by a control unit. After activation, the squibs activate a gas-generating propellant charge, which is operatively connected to a restraint for
  • Reference voltage source supplied voltage compared.
  • the accuracy of such a measurement depends on the accuracy of the test current with which the squib is applied during the test. With integrated circuits however, it is comparatively difficult and expensive to provide a high-precision power source.
  • the invention is based on the fact that, in the form of integrated circuits, current sources can be provided relatively easily and with relatively little effort, but they do not deliver high-precision current.
  • the method according to the invention therefore proposes, as an alternative, a reference measurement in which, in a first method step, a high-precision reference resistor is first subjected to a test current and the voltage drop which arises in the process is measured on the reference resistor. In a second method step, the test current is then applied to the squib and the voltage drop that occurs across the resistance of the squib is measured. Finally, based on the detected voltage drops and the known resistance value of the reference resistor, the current resistance of the
  • a device designed for carrying out the method according to the invention comprises a high-precision reference resistor and switching means which alternately connect the source of the test current with the reference resistor and the squib. Means are also provided for detecting and evaluating the voltage drop occurring at the reference resistor and at the squib.
  • FIG. 1 shows a schematic representation of a first exemplary embodiment of a safety device for vehicle occupants and FIG. 2 shows a second exemplary embodiment of such a safety device.
  • FIG. 1 shows, in the form of a block diagram, a first embodiment of a safety device for vehicle occupants.
  • This comprises an acceleration-sensitive sensor 2, which is preferably designed as a micromechanical sensor or as a piezoelectric sensor.
  • this sensor 2 is connected to a control unit 3 having input connections and output connections. So is the output connection of the
  • Power source 5 and on the other hand are connected to a current sink 6 receiving the current 12. Furthermore, the input connections of the differential amplifier 4 are connected to output connections AI, A2 of a switching device MUX.
  • the switching means MUX has a large number of input connections El, E2, E3, E4, El ', ... E4'.
  • the output connections of one squib ZP are each connected to two mutually assigned input connections E2, E2 ', E3, E3', E4, E4 '.
  • the ohmic resistance of each squib ZP is designated RM1, RM2, RMx.
  • Primer ZP is in operative connection (indicated by the dashed line) with a restraint for Vehicle occupants, such as gas bag 7 in particular.
  • a highly precise reference resistor RF is provided, which is connected with its connections to the input connections El, El 'of the switching means MÜX.
  • a first output connection 3a of the control device 3 is connected to the switching means MUX.
  • the control unit 3 controls the respective switching state of the switching means MUX via this connecting line.
  • a connection of an operating current source IB is also connected to the input connection AI of the switching means MUX.
  • the sensor 2 If a large acceleration indicating an accident occurs, the sensor 2 outputs a corresponding output signal to the control unit 3, which evaluates this output signal and connects at least one of the squibs ZP to the operating current source IB by means of the connecting line 3a and the switching means MUX in such a way that over the squib ZP flows a sufficiently large operating current that activates the squib.
  • the restraint such as gas bag 7 in particular
  • the squib ZP in turn activates a propellant charge, which deploys the gas bag 7 to protect a vehicle occupant.
  • the resistance value RM1, RM2, RMx, of the squib ZP provided in the device is precisely as possible. If the resistance value is within a permissible tolerance range, the driver can be signaled that the device is ready for operation using suitable display means, such as light-emitting diodes or the like. If the resistance value falls outside the tolerance range, this can be indicated by a warning signal.
  • the resistance values RM1, RM2, RMx of conventional squib ZP are approx. 2.15 ohms ⁇ 100-200 milliohms.
  • the resistance value of the measuring resistor RF is preferably of the same order of magnitude as the resistance value RM1, RMx, the squib ZP and is one Embodiment of the invention 2.1 ohms. This measuring resistor RF should be as precise as possible and only have a tolerance of 1% or less.
  • the squib ZP is first activated by the control unit 3
  • Control command transmitted to the switching means MUX which then first connects the measuring resistor RF to the current source 5 and 6 current sink.
  • a test current of the order of magnitude of preferably 100 milliamperes then flows through the reference resistor RF.
  • the voltage drop UF which arises at the reference resistor RF is present at the input connections of the differential amplifier 4 and is amplified there in accordance with the preselected gain factor. Suitable amplification factors are between 1 and 100.
  • Differential amplifier 4 is present at the input connection 4a of the control device 3 and can therefore be evaluated by the control device 3.
  • the switching means MUX is activated by the control unit 3 such that one of the two squibs ZP is now connected to the current source 5 and current sink 6 and through which the test current flows.
  • the voltage drop UM which arises at the resistance value RM1, RMx of the squib ZP is also amplified by the differential amplifier 4 and fed to the control unit 3.
  • the relationship is finally calculated:
  • the voltage values UF, UM are expediently evaluated by converting the measured values, initially in analog form, into digital values and then further processing them.
  • the control unit 3 expediently comprises a standard microcomputer, such as the Motorola 68 HC11 computer, which has a suitable analog / digital converter ADC, the input connection of which is connected to the input connection 4a of the control unit 3.
  • the switching means MUX can be a separate component; alternatively, the switching means MUX can also be part of a microcomputer and be arranged together with this in the control unit 3.
  • the reference resistance RF is expedient on the
  • Printed circuit board arranged, which also includes the other components of the device.
  • the reference resistor RF can also be produced using integrated technology.
  • the exemplary embodiment of the invention shown in FIG. 2 differs from the exemplary embodiment shown in FIG. 1 in that discrete, controllable semiconductor switching elements 8a, 8b, 8c, in particular MOS transistors, are provided as current sinks, which can be controlled by control lines 3a of control unit 3 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Air Bags (AREA)

Abstract

Dans un dispositif de sécurité (1) destiné aux passagers d'un véhicule, comprenant au moins un élément d'amorçage (ZP), la résistance (RM) de l'élément d'amorçage (ZP) est déterminée de la manière suivante: la chute de tension est tout d'abord mesurée au niveau d'une résistance de référence connue (RF), puis la chute de tension est mesurée au niveau de l'élément d'amorçage (ZP) à contrôler. Ensuite, la valeur de la résistance (RM) de l'élément d'amorçage (ZP) est calculée à partir des chutes de tension (UM, UF) mesurées et de la valeur connue de la résistance de référence (RF).
PCT/DE1996/001438 1995-08-17 1996-08-02 Procede permettant de verifier un dispositif de securite pour occupants d'un vehicule WO1997006981A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19530238.9 1995-08-17
DE1995130238 DE19530238B4 (de) 1995-08-17 1995-08-17 Verfahren zur Überprüfung einer Sicherheitseinrichtung und Gerät zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
WO1997006981A2 true WO1997006981A2 (fr) 1997-02-27
WO1997006981A3 WO1997006981A3 (fr) 1997-03-20

Family

ID=7769696

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/001438 WO1997006981A2 (fr) 1995-08-17 1996-08-02 Procede permettant de verifier un dispositif de securite pour occupants d'un vehicule

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DE (1) DE19530238B4 (fr)
WO (1) WO1997006981A2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705368A1 (de) * 1997-02-12 1998-08-20 Autoliv Dev Verfahren zum Testen einer Zündschaltung
DE19731717C5 (de) 1997-07-23 2004-06-24 Siemens Ag Schaltung zum Zünden von zwei Zündeinheiten, insbesondere Airbag-Zündeinheiten
DE19836672B4 (de) * 1998-08-13 2007-04-12 Bayerische Motoren Werke Ag Schaltanordnung zum Überprüfen einer Zündpille
DE19900978C2 (de) * 1999-01-13 2003-12-11 Siemens Ag Schaltungsanordnung zum Ermitteln eines Widerstandes eines Zündelements
DE19932250A1 (de) * 1999-07-10 2001-01-25 Daimler Chrysler Ag Verfahren zur Messung des ohmschen Widerstands einer elektrischen Verbindung und eines über diese elektrische Verbindung angeschlossenen Zünders einer Insassenschutzeinrichtung sowie einer Verbindung eines metallischen Gehäuseteils mit einem Massepotential
DE10349888B4 (de) * 2003-10-25 2006-10-05 Adam Opel Ag Codierte Zündeinheit für ein Airbag-Modul sowie damit ausgerüstetes Airbag-Modul für ein Kraftfahrzeug-Airbag-System
US7365546B2 (en) 2003-11-05 2008-04-29 Siemens Aktiengesellschaft Apparatus and method for non-destructive testing of primers, in particular for airbags in motor vehicles
DE102004042364B4 (de) * 2003-11-05 2006-10-26 Siemens Ag Vorrichtung zur zerstörungsfreien Prüfung von Zündpillen, insbesondere für Airbags von Kraftfahrzeugen
DE102012201049A1 (de) * 2012-01-25 2013-07-25 Robert Bosch Gmbh Verfahren und Vorrichtung zum Erkennen einer Einsatzfähigkeit einer Ansteuervorrichtung

Citations (6)

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Publication number Priority date Publication date Assignee Title
US4825148A (en) * 1987-12-18 1989-04-25 Trw Inc. Resistance measurement circuit and method
US4956631A (en) * 1989-03-20 1990-09-11 Mitsubishi Denki Kabushiki Kaisha Fault detector for vehicle safety system
EP0496254A1 (fr) * 1991-01-23 1992-07-29 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Dispositif de mesure pour mesurer électriquement la résistance et méthode pour cela
US5469071A (en) * 1993-12-07 1995-11-21 Kabushiki Kaisha Toshiba Resistor sensor input apparatus
EP0701928A1 (fr) * 1994-09-19 1996-03-20 Ford Motor Company Essai d'une résistance pour capsule détonante pour coussin d'air
EP0719681A1 (fr) * 1994-12-27 1996-07-03 Ford Motor Company Circuit de contrÔle pour un dispositif de désactivation d'un coussin d'air

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2222038C3 (de) * 1972-05-05 1978-07-06 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Prüfschaltung für die Auslösevorrichtung einer dem Schutz der Insassen eines Fahrzeuges während eines Unfalles dienenden Sicherheitseinrichtung
JPS5956127A (ja) * 1982-09-25 1984-03-31 Tokyo Keiso Kk 温度計測器
JP2728600B2 (ja) * 1992-05-28 1998-03-18 三菱電機株式会社 乗員保護装置の起動回路

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825148A (en) * 1987-12-18 1989-04-25 Trw Inc. Resistance measurement circuit and method
US4956631A (en) * 1989-03-20 1990-09-11 Mitsubishi Denki Kabushiki Kaisha Fault detector for vehicle safety system
EP0496254A1 (fr) * 1991-01-23 1992-07-29 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Dispositif de mesure pour mesurer électriquement la résistance et méthode pour cela
US5469071A (en) * 1993-12-07 1995-11-21 Kabushiki Kaisha Toshiba Resistor sensor input apparatus
EP0701928A1 (fr) * 1994-09-19 1996-03-20 Ford Motor Company Essai d'une résistance pour capsule détonante pour coussin d'air
EP0719681A1 (fr) * 1994-12-27 1996-07-03 Ford Motor Company Circuit de contrÔle pour un dispositif de désactivation d'un coussin d'air

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 159 (P-289), 24.Juli 1984 & JP 59 056127 A (TOUKIYOU KEISOU KK;OTHERS: 01), 31.März 1984, *

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Publication number Publication date
WO1997006981A3 (fr) 1997-03-20
DE19530238B4 (de) 2004-04-08
DE19530238A1 (de) 1997-02-20

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