WO1999005005A1 - Circuit pour amorcer deux unites d'amorçage, notamment des unites d'amorçage d'airbag - Google Patents

Circuit pour amorcer deux unites d'amorçage, notamment des unites d'amorçage d'airbag Download PDF

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Publication number
WO1999005005A1
WO1999005005A1 PCT/DE1998/001562 DE9801562W WO9905005A1 WO 1999005005 A1 WO1999005005 A1 WO 1999005005A1 DE 9801562 W DE9801562 W DE 9801562W WO 9905005 A1 WO9905005 A1 WO 9905005A1
Authority
WO
WIPO (PCT)
Prior art keywords
ignition
dmos
fet
units
control device
Prior art date
Application number
PCT/DE1998/001562
Other languages
German (de)
English (en)
Inventor
Marten Swart
Ekkehart-Peter Wagner
Joachim Baumgartner
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1999005005A1 publication Critical patent/WO1999005005A1/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
    • 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
    • B60R2021/01034—Controlling a plurality of restraint devices
    • 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

Definitions

  • the invention relates to a circuit for igniting two ignition units, in particular airbag ignition units, according to the preamble of the main claim.
  • Airbag units are used, for example, in the steering wheel, in the
  • the individual airbag units should not always be triggered or ignited at all times, but individually depending on sensor signals, the evaluation of which reveals the need to trigger the individual airbag units.
  • the triggering of the airbag units or of their ignition units is controlled by means of a control unit which has a microprocessor with associated memories and converts input signals coming from the sensors into output signals for triggering the ignition units.
  • the squib resistance is determined by means of a test current provided by an integrated circuit that is relatively imprecise and smaller than a squib current.
  • the ignition pill resistance can be determined.
  • the squib is connected to an energy source for triggering via a controllable field effect transistor.
  • the invention has for its object to reduce the wiring associated with the use of several airbag units in a vehicle.
  • the circuit according to the invention which is not only suitable for airbag ignition units, but for any type of electrically triggered ignition units, enables two ignition units to be controlled or triggered independently of one another via a two-pole line.
  • the subclaims 2 to 5 are directed to advantageous embodiments of the circuit according to the invention, it being achieved with the features of claims 4 and 5, respectively, that the ignition units, which can be ignited independently of one another according to the polarity of the ignition pulses, by measuring resistance when subjected to a low diagnostic voltage, or preferably with a low one Diagenosis current, can be checked with regard to their function.
  • the invention is explained below with reference to a block diagram shown in FIGS. 1 to 3, for example and with further details.
  • a control device 2 which in a manner known per se contains a microprocessor with associated memory device (ROM memory and RAM memory), has inputs 4, outputs 6 and 8 and a connection to a power supply U B , m which is, for example, an operating or ignition switch 10.
  • the control unit 2 controls two ignition units 12 and 14, each of which is connected in series with a self-conducting DMOS-FET (depletion metal oxide semiconductor field effect transistor) 16 and 18 at the outputs 6 and 8.
  • DMOS-FET depletion metal oxide semiconductor field effect transistor
  • Substrate or bulk electrode B of the DMOS-FET 16 connected.
  • the output 8 of the control device 2 is connected to the gate electrode G of the DMOS-FET 18 and the drain electrode D of the DMOS-FET 16 and via the ignition unit 14 to the source electrode S and the bulk electrode B of the DMOS-FET 18 connected.
  • the DMOS-FETs act at higher voltages to a certain extent like opposing diodes which are shown with dots.
  • the circuit works as follows: There is a high voltage (ignition voltage) at outputs 6 and 8 Current flow direction from 6 to 8, this leads to a high current flow through the ignition unit 12 and the DMOS-FET 16, so that the ignition unit 12 ignites.
  • the drop voltage across the ignition unit 12 additionally controls the DMOS-FET 16 so that it becomes more mediohm.
  • the DMOS-FET 18, on the other hand, has a high impedance at this polarity, so that the ignition unit 14 has only a small current flowing through it, which is not sufficient for ignition.
  • the ignition unit 14 If the ignition pulse lying between the outputs 6 and 8 has reversed polarity, then the ignition unit 14, as a result of the DMOS-FET 18 then polarized in the direction of current flow, has a current flowing through it which is sufficient to trigger or ignite the ignition unit 14.
  • the ignition unit 12 because of the high impedance of the DMOS-FET 16 at this polarity, only a very small current flows through it, which is not sufficient for ignition.
  • the voltage drop across the ignition unit 14 also switches through the DMOS-FET 18 so that it becomes even more mediohm.
  • FIG. 2 shows the circuit according to FIG. 1 m of the test phase, in particular when measuring the resistance of the increase 12.
  • a diagnostic current I meSs is impressed, which flows from output 6 to output 8.
  • the DMOS-FET 16 becomes more medium-resistance, while the resistance value of the DMOS-FET 18 increases somewhat.
  • the resistance of the ignition unit 12 can thus be measured with certain tolerance limits despite the additional current flow through the DMOS-FET 18 and the ignition unit 14.
  • the voltage drops occurring here on the ignition units 12 and 14 are shown with DUX or DU ⁇ 4 , indicating the respective polarities.
  • both DMOS-FETs 16 and 18 are current-permeable due to their self-conduction, so that both igniters 12 and 14 are traversed by low diagnostic currents, can alternatively be used from the effective to the Outputs 6 and 8 occurring resistance can also be summarized to the state of both ignition units.
  • the resistance has a predetermined value in the case of functional ignition units 12 and 14. If the control device 2 determines that the effective resistance at the outputs 6 and 8 has the predetermined value, then this is assessed as a perfect functional humidity of the two ignition units 12 and 14. In the event of a short circuit or a line interruption in or on a ignition unit 12 or 14, the diagnostic resistance changes, which, just as in the case of an individual evaluation, leads to an error display of the control unit 2.
  • the invention creates the possibility of igniting two ignition units 12 and 14 independently of one another via only one two-pole line (outputs 6 and 8) by means of the polarity of an ignition pulse, and to monitor their functionality with the aid of small diagnostic currents.
  • small diagnostic currents are preferably impressed for measuring the resistance of the ignition units 12 and 14, since this improves controllability and can even better suppress undesired effects on the ignition units 12 and 14.
  • self-conducting DMOS-FETs are used, which are each inverted with the ignition units 12 and 14 in series are.
  • self-blocking DMOS transistors instead of the self-conducting DMOS transistors 16 and 18.
  • a small but tolerable falsification of the measured values by the diode voltages occurs during the resistance measurement.
  • normal MOSFETs or other components with rectifier characteristics in the simplest case diodes, each with the opposite direction to the
  • Ignition units 12 and 14 are connected. However, due to the very low-resistance characteristic of normally-on DMOS-FETs, these are generally preferred, whereby their inverse diode characteristics are used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Abstract

L'invention concerne un circuit pour amorcer deux unités d'amorçage (12, 14), notamment des unités d'amorçage d'airbag, comportant un dispositif de commande (2) produisant une impulsion d'amorçage pour amorcer au moins une unité d'amorçage, entre deux sorties raccordées à l'unité d'amorçage. Le dispositif de commande est conçu de sorte que, en fonction des signaux acheminés à ses entrées, les impulsions de déclenchement puissent présenter différentes polarités. Les deux unités d'amorçage (12, 14) sont raccordées chacune de façon parallèle aux sorties du dispositif de commande (2) par l'intermédiaire d'un transistor à effet de champ MOS à double diffusion (15, 18). Les deux transistors à effet de champ MOS à double diffusion (15, 18) sont montés en opposition de sorte que, en fonction de la polarité d'amorçage, c'est l'une ou l'autre des unités d'amorçage qui effectue l'amorçage.
PCT/DE1998/001562 1997-07-23 1998-06-08 Circuit pour amorcer deux unites d'amorçage, notamment des unites d'amorçage d'airbag WO1999005005A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997131717 DE19731717C5 (de) 1997-07-23 1997-07-23 Schaltung zum Zünden von zwei Zündeinheiten, insbesondere Airbag-Zündeinheiten
DE19731717.0 1997-07-23

Publications (1)

Publication Number Publication Date
WO1999005005A1 true WO1999005005A1 (fr) 1999-02-04

Family

ID=7836683

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/001562 WO1999005005A1 (fr) 1997-07-23 1998-06-08 Circuit pour amorcer deux unites d'amorçage, notamment des unites d'amorçage d'airbag

Country Status (2)

Country Link
DE (1) DE19731717C5 (fr)
WO (1) WO1999005005A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999059843A1 (fr) * 1998-05-20 1999-11-25 Siemens Aktiengesellschaft Procede et dispositif pour verifier un circuit electrique, notamment le circuit d'allumage d'un systeme de protection des occupants d'une automobile
EP1032514B1 (fr) * 1997-11-27 2002-03-13 Siemens Aktiengesellschaft Systeme de protection des passagers d'un vehicule comportant plusieurs amorces et procede pour la commande du circuit d'allumage d'un tel systeme de protection des passagers

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6131947A (en) * 1998-01-23 2000-10-17 Trw Inc. Electrical connector for air bag inflator
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
DE10005785C1 (de) * 2000-02-10 2001-09-06 Siemens Ag Anordnung zum Auslösen eines Rückhaltemittels in einem Kraftfahrzeug
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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3326277C2 (fr) 1983-07-21 1989-10-05 Robert Bosch Gmbh
US5446442A (en) * 1992-03-31 1995-08-29 Siemens Aktiengesellschaft Circuit arrangement for triggering a vehicle passenger protection system
EP0705740A1 (fr) * 1993-06-28 1996-04-10 Sensor Technology Co., Ltd. Dispositif de declenchement de systemes de protection d'equipage
DE29609556U1 (de) * 1996-05-29 1996-08-14 Siemens AG, 80333 München Auslösevorrichtung für mindestens ein Rückhaltemittel in einem Kraftfahrzeug
US5596497A (en) * 1994-02-17 1997-01-21 Mitsubishi Denki Kabushiki Kaisha Control circuit for vehicle safety device
DE19530238A1 (de) 1995-08-17 1997-02-20 Bosch Gmbh Robert Verfahren zur Überprüfung einer Sicherheitseinrichtung und Gerät zur Durchführung des Verfahrens

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2740545B1 (fr) * 1995-10-30 1997-12-05 Livbag Snc Generateur pyrotechnique de gaz,a debit variable,pour coussins de protection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3326277C2 (fr) 1983-07-21 1989-10-05 Robert Bosch Gmbh
US5446442A (en) * 1992-03-31 1995-08-29 Siemens Aktiengesellschaft Circuit arrangement for triggering a vehicle passenger protection system
EP0705740A1 (fr) * 1993-06-28 1996-04-10 Sensor Technology Co., Ltd. Dispositif de declenchement de systemes de protection d'equipage
US5596497A (en) * 1994-02-17 1997-01-21 Mitsubishi Denki Kabushiki Kaisha Control circuit for vehicle safety device
DE19530238A1 (de) 1995-08-17 1997-02-20 Bosch Gmbh Robert Verfahren zur Überprüfung einer Sicherheitseinrichtung und Gerät zur Durchführung des Verfahrens
DE29609556U1 (de) * 1996-05-29 1996-08-14 Siemens AG, 80333 München Auslösevorrichtung für mindestens ein Rückhaltemittel in einem Kraftfahrzeug

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1032514B1 (fr) * 1997-11-27 2002-03-13 Siemens Aktiengesellschaft Systeme de protection des passagers d'un vehicule comportant plusieurs amorces et procede pour la commande du circuit d'allumage d'un tel systeme de protection des passagers
WO1999059843A1 (fr) * 1998-05-20 1999-11-25 Siemens Aktiengesellschaft Procede et dispositif pour verifier un circuit electrique, notamment le circuit d'allumage d'un systeme de protection des occupants d'une automobile

Also Published As

Publication number Publication date
DE19731717C5 (de) 2004-06-24
DE19731717C1 (de) 1998-12-10

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