EP1104367A1 - Pyrotechnic ignition element with integrated electronic system, for triggering a restraint system - Google Patents

Pyrotechnic ignition element with integrated electronic system, for triggering a restraint system

Info

Publication number
EP1104367A1
EP1104367A1 EP99938368A EP99938368A EP1104367A1 EP 1104367 A1 EP1104367 A1 EP 1104367A1 EP 99938368 A EP99938368 A EP 99938368A EP 99938368 A EP99938368 A EP 99938368A EP 1104367 A1 EP1104367 A1 EP 1104367A1
Authority
EP
European Patent Office
Prior art keywords
ignition
housing
active part
electronic part
element according
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
EP99938368A
Other languages
German (de)
French (fr)
Inventor
Uwe Albrecht
Anton Bretfeld
Gerhard Kordel
Joachim Maurer
Horst Laucht
Erwin Caflisch
Richard Baur
Michael Bischoff
Günter Fendt
Stefan Schwehr
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.)
Unax AG
Conti Temic Microelectronic GmbH
Dynamit Nobel GmbH Explosivstoff und Systemtechnik
ZF Airbag Germany GmbH
Original Assignee
Unax AG
Dynamit Nobel AG
TRW Airbag Systems GmbH
Dynamit Nobel GmbH Explosivstoff und Systemtechnik
Temic Telefunken Microelectronic 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 Unax AG, Dynamit Nobel AG, TRW Airbag Systems GmbH, Dynamit Nobel GmbH Explosivstoff und Systemtechnik, Temic Telefunken Microelectronic GmbH filed Critical Unax AG
Publication of EP1104367A1 publication Critical patent/EP1104367A1/en
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/103—Mounting initiator heads in initiators; Sealing-plugs
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/06—Electric contact parts specially adapted for use with electric fuzes
    • 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
    • B60R2021/01006—Mounting of electrical components in vehicles
    • 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
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26029—Ignitors

Definitions

  • the invention relates to an ignition element, in particular for triggering a restraint system such as e.g. an airbag or belt tensioner in motor vehicles.
  • a restraint system such as e.g. an airbag or belt tensioner in motor vehicles.
  • Ignition elements contain an ignition charge which changes into the gaseous state when the ignition element is triggered by a control unit, which is usually connected to sensors.
  • the ignition bridge usually consists of a wire resistor, through which an ignition current flows after tripping, which heats the wire resistance, the heat generated igniting the ignition charge.
  • the electrical ignition elements have a simple structure, but the disadvantage that undesired currents, such as fault, leakage or induced currents, can trigger the ignition charge.
  • the ignition charge only triggers if certain criteria, such as the receipt of a coded address, are present.
  • Such an electronic ignition element is described in DE 196 10 799.
  • a disadvantage of electronic ignition elements is that the pressure which arises during ignition and which can be up to a few 100 bar also acts on the ignition electronics, which can lead to their destruction.
  • Electronic ignition elements are often operated on a bus system to which several ignition elements are connected and on which the participants in the bus communicate bidirectionally. If the ignition electronics are destroyed when a single ignition element is ignited, the communication on the entire bus can be interrupted, so that the other participants can also no longer be controlled.
  • the invention has for its object to improve electronic ignition elements to the effect that the ignition electronics remain functional even after lighting. This object is achieved with the features of claim 1.
  • the ignition element according to the invention has a modular structure. It consists of an active part and an electronic part.
  • the active part has a housing and a bushing base fastened therein, on which at least one contact element accessible from the outside is arranged.
  • the housing protrudes above the bushing base, so that a cavity for receiving the independently mountable electronic part is created.
  • An advantage of the separation of the ignition electronics, which is located in the electronic part, and the ignition charge, which is arranged in the active part, is that the pressure force generated when the ignition charge is triggered cannot adversely affect the ignition electronics. This is because the fixed connection of the feed-through base of the active part to the housing absorbs the portions of the pressure force directed in the direction of the electronic part. This ensures that the ignition electronics also function after ignition, so that the ignition element can continue to communicate with a control unit and does not interfere with the accessibility of the other participants when connected to a bus system.
  • This modular structure is also advantageous in the manufacture of the igniter elements, because the components of the igniter element can be days individually and together after assembly.
  • the bushing base of the active part and, if appropriate, also a base piece of the electronic part are preferably fastened to the housing by means of a circumferential weld seam.
  • This connection enables the active part and the electronic part to be hermetically sealed both from one another and from the environment. The ignition element is thus protected against external influences and outgassing of the ignition charge is prevented.
  • a weld seam connection has the further advantage that the connection is mechanically very firm, so that the ignition electronics are protected against pressure surges even at very high pressures. At lower pressures, flare or clamp connections can also be used. Plastic materials can then also be used for the bushing base and the base piece.
  • the contact elements of the active and the electronic part which come into electrical contact when the two parts are joined together, can be designed in different ways.
  • the contact elements can be designed as a pin-socket connection or they can consist of elements that are biased against each other by spring force, such as metallic connecting lugs.
  • Pads can also be used, which are connected with electrically conductive adhesive.
  • the lead-through base of the active part and also the base part of the electronic part can contain glass melts, through which the contact or connection elements are led out in an insulating manner. Based on these Pressure-resistant insulation, the pressure generated during lighting cannot shift the contact or connection elements and also cannot reach the sensitive ignition electronics along them in the electronic part.
  • the ignition electronics can be programmed by programming signals on the connection elements.
  • the ignition element can be adapted, for example, to a different coding of the input signals or delay times can be programmed by the programming.
  • the flexibility of the igniter can be increased by programming.
  • the ignition electronics can have a transmitting part for outputting data to the connection elements and thus to a connected control unit. For example, feedback that the ignition charge has been triggered or other status messages, such as the temperature, if a temperature sensor is installed, can be output.
  • the possibility of bidirectional communication provided by the transmitting part increases the security of the system considerably, since each component can also receive feedback from other components.
  • the ignition current can be made available by the ignition electronics in such a way that the ignition element has electrical supply connections for the ignition current, the ignition electronics acting as a switch which connects the supply connections to the contact elements only when a corresponding one coded input signal is present at the connection elements.
  • the housing of the ignition element can also be used as the supply connection.
  • the ignition electronics can also contain an energy store, such as a capacitor, which is charged by certain input signals and discharged to a further input signal and thereby provides the ignition current.
  • Fig. 1 the ignition element in a partial sectional view in the semi-assembled state
  • Fig. 2 shows the completed igniter.
  • ignition element 1 has an active part 18, which has a cup-shaped housing 2, the lower end face of which is open.
  • the housing 2 is made of sheet metal to prevent the ignition charge from outgassing and to protect electronics located in the housing 2 from radiation.
  • a housing insert 3 is fitted in the upper area of the housing 2 and has a central, essentially funnel-shaped loading bore 4.
  • the larger opening of the charging bore 4 lies against the upper end face of the housing 2, the housing 2 having a star-shaped predetermined breaking point 2a in the region of the larger opening of the charging bore 4.
  • the carrier element 5 consists of a solid material, such as the ceramic material A1 2 0 3 .
  • the ignition bridge 6 is located in the smaller opening of the charging bore 4.
  • the charging bore 4 of the housing insert 3, which is sealed off at the bottom by the carrier element 5, is filled with an ignition charge 7.
  • the ignition charge 7 consists of one component; however, it is also possible to use two-stage or multi-stage primers.
  • the ignition charge 7 compressed in the charging bore 4 is closed at the top with a cover 8, so that a tight packing position is guaranteed.
  • the housing 2 and the bushing base 9 are connected to one another by means of a circumferential weld seam 10.
  • the material of the housing 2 and the bushing base 9 is liquefied along a circumferential line, so that the two parts form a firm connection when they cool down.
  • the weld joint meets the requirements of the helium leak test.
  • the length of the housing 2 is dimensioned such that it projects above the bushing base 9, whereby a cavity 12 is created.
  • two metal contact pins 11 are guided outwards, ie into the cavity 12.
  • Glass melting 15 formed, which electrically isolates the respective contact pin 11 and the bushing base 9 from each other.
  • the contact pins 11 are connected to one another in the upper region via the ignition bridge 6 or a line (not shown) which contains the ignition bridge 6.
  • the ignition element 1 furthermore has a separate electronic part 19 which can be inserted into the cavity 12 of the housing 2.
  • the electronic part 19 has an annular side wall 13, which is dimensioned in its diameter such that it can be inserted into the cavity 12 of the housing 2 without much play.
  • the electronic part 19 has ignition electronics 14 which provide the ignition current for the ignition bridge 6 of the active part 18.
  • Contact sockets 17 are attached above the ignition electronics 14 and are connected to outputs (not shown) of the ignition electronics.
  • the contact sockets 17 are aligned and dimensioned such that they include the contact pins 11 of the active part 18 when the electronic part 19 is inserted into the cavity 12, so that an electrically conductive connection between the active part 18 and the electronic part 19 is created.
  • the electronic part 19 has a base piece 16 below the ignition electronics 14. If the electronic part 19 is inserted into the housing 2, the base piece 16 closes the latter.
  • the housing 2 and the base piece are flush with each other.
  • the housing 2 and the base piece 16 are connected to one another by means of a circumferential weld seam 20.
  • three metallic connecting pins 21 are guided to the outside.
  • a glass seal 22 is formed around each of the connection pins 21, which electrically insulates the respective connection pin 21 and the base piece 16 from one another.
  • the upper ends of the connecting pins 21 are connected to inputs of the ignition electronics 14, which are not shown.
  • the active part 18 is first joined together and the lead-through base 9 is welded to the housing 2 in a sealing manner. The active part 18 is then checked for its functionality.
  • An electronic part 19 that has already been checked for functionality is inserted into the cavity 12 of the housing 2, so that the contact elements of the active part 18 and the electronic part 19, namely the contact pins 11 and the contact sockets 17, engage. Now the complete igniter 1, i.e. the active part 18 and the electronic part 19 electrically connected to it are checked for errors. If the complete ignition element 1 works correctly, the last step is to connect the electronic part 19 mechanically to the active part 18 by fastening the base piece 16 of the electronic part 19 to the housing 2 by means of a circumferential weld seam 20.
  • the ignition electronics 14 are supplied with coded signals via the connection elements 21, which signals are output by a control unit (not shown), for example via a bus system.
  • the ignition electronics 14 provide an ignition current at the contact sockets 17, for example with Using a previously charged capacitor.
  • the ignition current then flows through the ignition bridge 6 and heats it.
  • the heat generated ignites the ignition charge 7, which rapidly expands into the gaseous state and thereby destroys the cover 8 and opens the housing 2 at the predetermined breaking point 2a, so that the gas can escape.
  • the pressure generated during the ignition process also exerts a force on the bushing base. Since the bushing base 9 is firmly connected to the housing 2 by means of the circumferential weld seam 10, it does not give in to the pressure, but remains stationary. The contact pins 11 also remain fixed in the glass bushings 15. The mechanical load therefore remains completely in the active part 18. It is not transmitted to the electronic part 19 and the sensitive ignition electronics 14 arranged therein. This ensures that the ignition electronics 14 are functional even after the ignition process. This means that the other elements connected to the bus can continue to communicate with each other undisturbed. In addition, the ignition electronics 14 of the already triggered ignition element can still receive and output signals. The ignition electronics 14 can detect, for example, by measuring the change in the resistance between the two contact sockets 17, that the ignition charge 7 has been triggered and output an output signal via the connecting pins 21 to the control unit.

Abstract

The invention relates to an ignition system (1), notably for triggering a restraint system, comprising an active part (18) with a housing (2) which contains an ignition charge (7), an ignition bridge (6) for igniting the ignition charge (7) and at least one contact element (11) which protrudes from a lead-through base (9) and is connected to the ignition bridge (6) such that an ignition current can be applied; as well as a separate electronic part (19) which has an electronic ignition system (14) for providing an ignition current. The lead-through base (9) of the active part (18) is immovably fixed to the housing (2) in a sealing manner and the housing (2) extends above the lead-through base (9) of the active part (18) so that the electronic part (19) can be inserted into the housing (2) as an independently mountable unit. On insertion the electronic part (19) is electrically connected to the active part (18) via contact elements (11, 17).

Description

Pyrotechnisches Anzündelement mit integrierter Elektronik, zum Auslösen eines Rückhaltesystems Pyrotechnic igniter with integrated electronics to trigger a restraint system
Die Erfindung betrifft ein Anzündelement insbesondere zum Auslösen eines Rückhaltesystems wie z.B. eines Air- bags oder Gurtstraffers in Kraftfahrzeugen.The invention relates to an ignition element, in particular for triggering a restraint system such as e.g. an airbag or belt tensioner in motor vehicles.
Anzündelemente enthalten eine Anzündladung, welche stark expandierend in den gasförmigen Zustand übergeht, wenn das Anzündelement von einer Steuereinheit, die üblicherweise mit Sensoren verbunden ist, ausgelöst wird.Ignition elements contain an ignition charge which changes into the gaseous state when the ignition element is triggered by a control unit, which is usually connected to sensors.
Bekannt sind elektrische und elektronische Anzündelemente. Bei elektrischen Anzündelementen besteht die Zündbrücke üblicherweise aus einem Drahtwiderstand, durch den nach der Auslösung ein Anzündstrom fließt, der den Drahtwiderstand erwärmt, wobei die entstehende Wärme die Anzündladung anzündet. Die elektrischen Anzündelemente haben einen einfachen Aufbau, jedoch den Nachteil, daß unerwünschte Ströme, wie beispielsweise Fehler-, Leck- oder induzierte Ströme, die Anzündladung auslösen können.Electrical and electronic ignition elements are known. With electrical ignition elements, the ignition bridge usually consists of a wire resistor, through which an ignition current flows after tripping, which heats the wire resistance, the heat generated igniting the ignition charge. The electrical ignition elements have a simple structure, but the disadvantage that undesired currents, such as fault, leakage or induced currents, can trigger the ignition charge.
Bei elektronischen Anzündelementen löst die Anzündladung nur dann aus, wenn bestimmte Kriterien, wie beispielsweise der Empfang einer kodierten Adresse, vorliegen. Ein derartiges elektronisches Anzündelement ist in der DE 196 10 799 beschrieben. Nachteilig bei elektronischen Anzündelementen ist, daß der bei dem Anzünden entstehende Druck, der bis zu einigen 100 bar betragen kann, auch an der Anzündelektronik angreift, was zu deren Zerstörung führen kann.In the case of electronic ignition elements, the ignition charge only triggers if certain criteria, such as the receipt of a coded address, are present. Such an electronic ignition element is described in DE 196 10 799. A disadvantage of electronic ignition elements is that the pressure which arises during ignition and which can be up to a few 100 bar also acts on the ignition electronics, which can lead to their destruction.
Häufig werden elektronische Anzündelemente an einem Bussystem betrieben, an das mehrere Anzündelemente angeschlossen sind und auf dem die Teilnehmer des Busses bidirektional kommunizieren. Wenn beim Anzünden eines einzelnen Anzündelements dessen Anzündelektronik zerstört wird, kann die Kommunikation auf dem gesamten Bus unterbrochen werden, so daß auch die anderen Teilnehmer nicht mehr angesteuert werden können.Electronic ignition elements are often operated on a bus system to which several ignition elements are connected and on which the participants in the bus communicate bidirectionally. If the ignition electronics are destroyed when a single ignition element is ignited, the communication on the entire bus can be interrupted, so that the other participants can also no longer be controlled.
Der Erfindung liegt die Aufgabe zugrunde, elektronische Anzündelemente dahingehend zu verbessern, daß die Anzündelektronik auch nach dem Anzünden funktionsfähig bleibt. Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Patentanspruchs 1 gelöst.The invention has for its object to improve electronic ignition elements to the effect that the ignition electronics remain functional even after lighting. This object is achieved with the features of claim 1.
Das erfindungsgemäße Anzündelement ist modular aufgebaut. Es besteht aus einem Wirkteil und einem Elektronikteil. Das Wirkteil hat ein Gehäuse und einen darin befestigten Durchführungssockel, an dem mindestens ein von außen zugängliches Kontaktelement angeordnet ist. Das Gehäuse überragt den Durchführungssockel, so daß ein Hohlraum zur Aufnahme des selbständig montierbaren Elektronikteils geschaffen wird. Bei dem Einschieben des Elektronikteils in das Gehäuse des Wirkteils werden die beiden Teile durch ihre Kontaktelemente elektrisch miteinander verbunden.The ignition element according to the invention has a modular structure. It consists of an active part and an electronic part. The active part has a housing and a bushing base fastened therein, on which at least one contact element accessible from the outside is arranged. The housing protrudes above the bushing base, so that a cavity for receiving the independently mountable electronic part is created. When the electronic part is inserted into the housing of the active part, the two parts are electrically connected to one another by their contact elements.
Ein Vorteil der Trennung der Anzündelektronik, die sich im Elektronikteil befindet, und der Anzündladung, die im Wirkteil angeordnet ist, liegt darin, daß die bei dem Auslösen der Anzündladung erzeugte Druckkraft die Anzündelektronik nicht beeinträchtigen kann. Denn die feste Verbindung des Durchführungssockels des Wirkteils mit dem Gehäuse fängt die in Richtung des Elektronikteils gerichteten Anteile der Druckkraft auf. Somit ist sichergestellt, daß die Anzündelektronik auch nach dem Anzünden funktioniert, so daß das Anzündelement weiterhin mit einer Steuereinheit kommunizieren kann und bei Anschluß an ein Bussystem die Erreichbarkeit der anderen Teilnehmer nicht stört.An advantage of the separation of the ignition electronics, which is located in the electronic part, and the ignition charge, which is arranged in the active part, is that the pressure force generated when the ignition charge is triggered cannot adversely affect the ignition electronics. This is because the fixed connection of the feed-through base of the active part to the housing absorbs the portions of the pressure force directed in the direction of the electronic part. This ensures that the ignition electronics also function after ignition, so that the ignition element can continue to communicate with a control unit and does not interfere with the accessibility of the other participants when connected to a bus system.
Dieser modulare Aufbau ist weiterhin bei der Herstellung der Anzündelemente von Vorteil, denn die Komponenten des Anzündelements können sowohl vor der Mon- tage einzeln als auch nach dem Zusammenbau gemeinsam geprüft werden.This modular structure is also advantageous in the manufacture of the igniter elements, because the components of the igniter element can be days individually and together after assembly.
Vorzugsweise wird der Durchführungssockel des Wirkteils und gegebenfalls auch ein Bodenstück des Elektronikteils mittels einer umlaufenden Schweißnaht an dem Gehäuse befestigt. Diese Verbindung ermöglicht ein hermetisches Abdichten des Wirkteils und des Elektronikteils sowohl gegeneinander als auch gegenüber der Umgebung. Somit ist das Anzündelement vor äußeren Einflüssen geschützt und ein Ausgasen der Anzündladung wird verhindert . Eine Schweißnahtverbindung hat den weiteren Vorteil, daß die Verbindung mechanisch sehr fest ist, so daß die Anzündelektronik auch bei sehr hohen Drücken vor Druckstössen geschützt ist. Bei niedrigeren Drücken können auch Bördel- oder Klemmverbindungen benutzt werden. Für den Durchführungssockel und das Bodenstück können dann auch Kunststoffmaterialien verwendet werden.The bushing base of the active part and, if appropriate, also a base piece of the electronic part are preferably fastened to the housing by means of a circumferential weld seam. This connection enables the active part and the electronic part to be hermetically sealed both from one another and from the environment. The ignition element is thus protected against external influences and outgassing of the ignition charge is prevented. A weld seam connection has the further advantage that the connection is mechanically very firm, so that the ignition electronics are protected against pressure surges even at very high pressures. At lower pressures, flare or clamp connections can also be used. Plastic materials can then also be used for the bushing base and the base piece.
Die Kontaktelemente des Wirk- und des Elektronikteils, die beim Zusammenfügen der beiden Teile in elektrischen Kontakt gelangen, können verschiedenartig ausgestaltet sein. Die Kontaktelemente können als Stift-Buchsen-Verbindung ausgebildet sein oder sie können aus mit Federkraft gegeneinander vorgespannten Elementen, wie beispielsweise metallischen Anschlußfahnen bestehen. Ebenso können Anschlußflächen verwendet werden, welche mit elektrisch leitendem Kleber verbunden werden.The contact elements of the active and the electronic part, which come into electrical contact when the two parts are joined together, can be designed in different ways. The contact elements can be designed as a pin-socket connection or they can consist of elements that are biased against each other by spring force, such as metallic connecting lugs. Pads can also be used, which are connected with electrically conductive adhesive.
Der Durchführungssockel des Wirkteils und auch das Bodenstück des Elektronikteils können Glaseinschmelzungen enthalten, durch welche die Kontakt- bzw. die Anschlußelemente isolierend herausgeführt sind. Aufgrund dieser druckfesten Isolierung kann der bei dem Anzünden entstehende Druck die Kontakt- bzw. Anschlußelemente nicht verschieben und auch nicht an ihnen entlang in den Elektronikteil zu der empfindlichen Anzündelektronik gelangen.The lead-through base of the active part and also the base part of the electronic part can contain glass melts, through which the contact or connection elements are led out in an insulating manner. Based on these Pressure-resistant insulation, the pressure generated during lighting cannot shift the contact or connection elements and also cannot reach the sensitive ignition electronics along them in the electronic part.
In einer bevorzugten Ausführungsform der Erfindung ist die Anzündelektronik durch Programmiersignale an den Anschlußelementen programmierbar. Durch die Programmierung kann das Anzündelement beispielsweise an eine andere Kodierung der Eingangssignale angepaßt werden oder es können Verzögerungszeiten programmiert werden. Durch die Programmierung läßt sich die Flexibilität des Anzündelements steigern.In a preferred embodiment of the invention, the ignition electronics can be programmed by programming signals on the connection elements. The ignition element can be adapted, for example, to a different coding of the input signals or delay times can be programmed by the programming. The flexibility of the igniter can be increased by programming.
Die Anzündelektronik kann einen Sendeteil zum Ausgeben von Daten an die Anschlußelemente und damit an eine angeschlossene Steuereinheit aufweisen. Beispielsweise kann eine Rückmeldung, daß die Anzündladung ausgelöst worden ist, oder andere Zustandsmeldungen, wie beispielsweise die Temperatur, falls ein Temperatursensor installiert ist, ausgegeben werden. Die durch den Sendeteil gegebene Möglichkeit der bidirektionalen Kommunikation erhöht die Sicherheit des Systems erheblich, da jede Komponente auch Rückmeldungen von anderen Komponenten erhalten kann.The ignition electronics can have a transmitting part for outputting data to the connection elements and thus to a connected control unit. For example, feedback that the ignition charge has been triggered or other status messages, such as the temperature, if a temperature sensor is installed, can be output. The possibility of bidirectional communication provided by the transmitting part increases the security of the system considerably, since each component can also receive feedback from other components.
Die Bereitstellung des Anzündstromes durch die Anzündelektronik kann derart erfolgen, daß das Anzündelement elektrische Versorgungsanschlüsse für den Anzündstrom aufweist, wobei die Anzündelektronik wie ein Schalter wirkt, der die Versorgungsanschlüsse mit den Kontakt- elementen nur dann verbindet, wenn ein entsprechendes kodiertes Eingangssignal an den Anschlußelementen anliegt. Als Versorgungsanschluß kann auch das Gehäuse des Anzündelements benutzt werden. Die Anzündelektronik kann aber auch einen Energiespeicher, wie beispielsweise einen Kondensator, enthalten, der durch bestimmte Eingangssignale aufgeladen wird und auf ein weiteres Eingangssignal entladen wird und dabei den Anzündstrom bereitstellt .The ignition current can be made available by the ignition electronics in such a way that the ignition element has electrical supply connections for the ignition current, the ignition electronics acting as a switch which connects the supply connections to the contact elements only when a corresponding one coded input signal is present at the connection elements. The housing of the ignition element can also be used as the supply connection. However, the ignition electronics can also contain an energy store, such as a capacitor, which is charged by certain input signals and discharged to a further input signal and thereby provides the ignition current.
Anhand der Zeichnungen wird ein Ausführungsbeispiel der Erfindung näher erläutert .An exemplary embodiment of the invention is explained in more detail with reference to the drawings.
Es zeigen:Show it:
Fig. 1 das Anzündelement in Teilschnittdarstellung in halbmontiertem Zustand undFig. 1, the ignition element in a partial sectional view in the semi-assembled state and
Fig. 2 das fertiggestellte Anzündelement.Fig. 2 shows the completed igniter.
Die in den Fign. 1 und 2 gezeigte Anzündelement 1 hat ein Wirkteil 18, das ein topfförmiges Gehäuse 2 aufweist, dessen untere Stirnseite offen ist. Das Gehäuse 2 besteht aus Metallblech, um ein Ausgasen der Anzündladung zu verhindern und um im Gehäuse 2 befindliche Elektronik vor Einstrahlung zu schützen. Im oberen Bereich des Gehäuses 2 ist ein Gehäuseeinsatz 3 eingepaßt, der eine zentrale, im wesentlichen trichterförmige Ladebohrung 4 aufweist. Die größere Öffnung der Ladebohrung 4 liegt an der oberen Stirnseite des Gehäuses 2 an, wobei das Gehäuse 2 im Bereich der größeren Öffnung der Ladebohrung 4 eine sternförmige Sollbruchstelle 2a aufweist. Unterhalb der Ladebohrung 4 befindet sich ein Trägerelement 5, auf dem sich eine Zündbrücke 6 in Form eines Schichtwiderstandes befindet. Das Trägerelement 5 besteht aus einem festen Werkstoff, wie beispielsweise dem Keramikmaterial A1203. Die Zündbrücke 6 befindet sich in der kleineren Öffnung der Ladebohrung 4. Die von dem Trägerelement 5 unten dicht verschlossene Ladebohrung 4 des Gehäuseeinsatzes 3 ist mit einer Anzündladung 7 gefüllt. Hier besteht die Anzündladung 7 aus einer Komponente; es ist jedoch möglich, auch zwei- oder mehrstufige Anzündladungen zu verwenden. Die in der Ladebohrung 4 verdichtete Anzündladung 7 ist oben mit einem Deckel 8 abgeschlossen, so daß eine dichte Packungslage garantiert ist.The in Figs. 1 and 2 shown ignition element 1 has an active part 18, which has a cup-shaped housing 2, the lower end face of which is open. The housing 2 is made of sheet metal to prevent the ignition charge from outgassing and to protect electronics located in the housing 2 from radiation. A housing insert 3 is fitted in the upper area of the housing 2 and has a central, essentially funnel-shaped loading bore 4. The larger opening of the charging bore 4 lies against the upper end face of the housing 2, the housing 2 having a star-shaped predetermined breaking point 2a in the region of the larger opening of the charging bore 4. Below the charging bore 4 there is a carrier element 5 on which there is an ignition bridge 6 in the form of a sheet resistor. The carrier element 5 consists of a solid material, such as the ceramic material A1 2 0 3 . The ignition bridge 6 is located in the smaller opening of the charging bore 4. The charging bore 4 of the housing insert 3, which is sealed off at the bottom by the carrier element 5, is filled with an ignition charge 7. Here the ignition charge 7 consists of one component; however, it is also possible to use two-stage or multi-stage primers. The ignition charge 7 compressed in the charging bore 4 is closed at the top with a cover 8, so that a tight packing position is guaranteed.
Unterhalb des Gehäuseeinsatzes 3 ist ein metallischer Durchführungssockel 9, der das Gehäuse 2 dicht verschließt, in Form einer sogenannten Glas-Metall-Durchführung angeordnet . Mittels einer umlaufenden Schweißnaht 10 sind das Gehäuse 2 und der Durchführungssockel 9 miteinander verbunden. Bei der Schweißung wird das Material des Gehäuses 2 und des Durchführungssockels 9 entlang einer umfänglich verlaufenden Linie verflüssigt, so daß die beiden Teile bei Abkühlung eine feste Verbindung eingehen. Die Schweißnahtverbindung erfüllt die Anforderungen des Helium-Lecktests.A metallic bushing base 9, which tightly closes the housing 2, is arranged below the housing insert 3 in the form of a so-called glass-metal bushing. The housing 2 and the bushing base 9 are connected to one another by means of a circumferential weld seam 10. During welding, the material of the housing 2 and the bushing base 9 is liquefied along a circumferential line, so that the two parts form a firm connection when they cool down. The weld joint meets the requirements of the helium leak test.
Die Länge des Gehäuses 2 ist derart bemessen, daß es den Durchführungssockel 9 überragt, wodurch ein Hohlraum 12 geschaffen wird. Durch den Durchführungssockel 9 sind zwei Kontaktstifte 11 aus Metall nach außen, d.h. in den Hohlraum 12, geführt. In dem Durchführungs- sockel 9 ist um jeden der Kontaktstifte 11 jeweils eine Glaseinschmelzung 15 ausgebildet, welche den jeweiligen Kontaktstift 11 und den Durchführungssockel 9 elektrisch voneinander isoliert. Die Kontaktstif e 11 sind im oberen Bereich über die Zündbrücke 6 bzw. eine nicht dargestellte Leitung, welche die Zündbrücke 6 enthält, miteinander verbunden.The length of the housing 2 is dimensioned such that it projects above the bushing base 9, whereby a cavity 12 is created. Through the bushing base 9, two metal contact pins 11 are guided outwards, ie into the cavity 12. In the bushing base 9 there is one around each of the contact pins 11 Glass melting 15 formed, which electrically isolates the respective contact pin 11 and the bushing base 9 from each other. The contact pins 11 are connected to one another in the upper region via the ignition bridge 6 or a line (not shown) which contains the ignition bridge 6.
Das Anzündelement 1 weist des weiteren ein separates Elektronikteil 19 auf, das in den Hohlraum 12 des Gehäuses 2 einschiebbar ist. Das Elektronikteil 19 hat eine ringförmige Seitenwand 13, welche in ihrem Durchmesser derart bemessen ist, daß sie in den Hohlraum 12 des Gehäuses 2 ohne großes Spiel einsetzbar ist. Das Elektronikteil 19 weist eine Anzündelektronik 14 auf, welche den Anzündstrom für die Zündbrücke 6 des Wirkteils 18 bereitstellt. Oberhalb der Anzündelektronik 14 sind Kontaktbuchsen 17 befestigt, welche an nicht dargestellte Ausgänge der Anzündelektronik angeschlossen sind. Die Kontaktbuchsen 17 sind derart ausgerichtet und derart in ihrer Größe bemessen, daß sie bei dem Einschieben des Elektronikteils 19 in den Hohlraum 12 die Kontaktstifte 11 des Wirkteils 18 umfassen, so daß eine elektrisch leitende Verbindung zwischen Wirkteil 18 und Elektronikteil 19 geschaffen wird.The ignition element 1 furthermore has a separate electronic part 19 which can be inserted into the cavity 12 of the housing 2. The electronic part 19 has an annular side wall 13, which is dimensioned in its diameter such that it can be inserted into the cavity 12 of the housing 2 without much play. The electronic part 19 has ignition electronics 14 which provide the ignition current for the ignition bridge 6 of the active part 18. Contact sockets 17 are attached above the ignition electronics 14 and are connected to outputs (not shown) of the ignition electronics. The contact sockets 17 are aligned and dimensioned such that they include the contact pins 11 of the active part 18 when the electronic part 19 is inserted into the cavity 12, so that an electrically conductive connection between the active part 18 and the electronic part 19 is created.
Das Elektronikteil 19 hat unterhalb der Anzündelektronik 14 ein Bodenstück 16. Ist das Elektronikteil 19 in das Gehäuse 2 eingeschoben, verschließt das Bodenstück 16 dieses. Das Gehäuse 2 und das Bodenstück schließen bündig miteinander ab. Mittels einer umlaufenden Schweißnaht 20 sind das Gehäuse 2 und das Bodenstück 16 miteinander verbunden. Durch das Bodenstück 16 sind drei metallische Anschlußstifte 21 nach außen geführt. In dem Bodenstück 16 ist um jeden der Anschlußstifte 21 jeweils eine Glaseinschmelzung 22 ausgebildet, welche den jeweiligen Anschlußstift 21 und das Bodenstück 16 elektrisch voneinander isoliert. Die oberen Enden der Anschlußstifte 21 sind mit nicht dargestellten Eingängen der Anzündelektronik 14 verbunden.The electronic part 19 has a base piece 16 below the ignition electronics 14. If the electronic part 19 is inserted into the housing 2, the base piece 16 closes the latter. The housing 2 and the base piece are flush with each other. The housing 2 and the base piece 16 are connected to one another by means of a circumferential weld seam 20. Through the bottom piece 16, three metallic connecting pins 21 are guided to the outside. In the base piece 16, a glass seal 22 is formed around each of the connection pins 21, which electrically insulates the respective connection pin 21 and the base piece 16 from one another. The upper ends of the connecting pins 21 are connected to inputs of the ignition electronics 14, which are not shown.
Bei der Herstellung des Anzündelements 1 wird zunächst das Wirkteil 18 zusammengefügt und der Durchführungs- sockel 9 mit dem Gehäuse 2 abdichtend verschweißt. Anschließend wird das Wirkteil 18 auf seine Funktionsfähigkeit überprüft.When the ignition element 1 is manufactured, the active part 18 is first joined together and the lead-through base 9 is welded to the housing 2 in a sealing manner. The active part 18 is then checked for its functionality.
Ein bereits auf Funktionsfähigkeit überprüftes Elektronikteil 19 wird in den Hohlraum 12 des Gehäuses 2 eingeschoben, so daß die Kontaktelemente des Wirkteils 18 und des Elektronikteils 19, nämlich die Kontaktstifte 11 und die Kontaktbuchsen 17, zusammengreifen. Nun wird das vollständige Anzündelement 1, d.h. das Wirkteil 18 und das elektrisch mit diesem verbundene Elektronikteil 19 auf Fehler überprüft. Arbeitet das vollständige Anzündelement 1 fehlerfrei, wird als letzter Schritt das Elektronikteil 19 auch mechanisch mit dem Wirkteil 18 verbunden, indem das Bodenstück 16 des Elektronikteils 19 mittels einer umfänglich umlaufenden Schweißnaht 20 an dem Gehäuse 2 befestigt wird.An electronic part 19 that has already been checked for functionality is inserted into the cavity 12 of the housing 2, so that the contact elements of the active part 18 and the electronic part 19, namely the contact pins 11 and the contact sockets 17, engage. Now the complete igniter 1, i.e. the active part 18 and the electronic part 19 electrically connected to it are checked for errors. If the complete ignition element 1 works correctly, the last step is to connect the electronic part 19 mechanically to the active part 18 by fastening the base piece 16 of the electronic part 19 to the housing 2 by means of a circumferential weld seam 20.
Der Anzündelektronik 14 werden über die Anschlußelemente 21 kodierte Signale zugeführt, die von einer nicht dargestellten Steuereinheit beispielsweise über ein Bussystem ausgegeben werden. Auf ein vorbestimmtes Eingangssignal hin stellt die Anzündelektronik 14 einen Anzündstrom an den Kontaktbuchsen 17 bereit, z.B. mit Hilfe eines zuvor aufgeladenen Kondensators. Der Anzündstrom fließt dann durch die Zündbrücke 6 und erwärmt dies. Die dabei entstehende Wärme zündet die Anzündladung 7 an, welche stark expandierend in den gasförmigen Zustand übergeht und dabei den Deckel 8 zerstört sowie das Gehäuse 2 an der Soll-Bruchstelle 2a öffnet, so daß das Gas austreten kann.The ignition electronics 14 are supplied with coded signals via the connection elements 21, which signals are output by a control unit (not shown), for example via a bus system. In response to a predetermined input signal, the ignition electronics 14 provide an ignition current at the contact sockets 17, for example with Using a previously charged capacitor. The ignition current then flows through the ignition bridge 6 and heats it. The heat generated ignites the ignition charge 7, which rapidly expands into the gaseous state and thereby destroys the cover 8 and opens the housing 2 at the predetermined breaking point 2a, so that the gas can escape.
Der bei dem Anzündvorgang entstehende Druck übt auch eine Kraft auf den Durchführungssockel aus . Da der Durchführungssockel 9 mittels der umlaufenden Schweißnaht 10 fest mit dem Gehäuse 2 verbunden ist, gibt er dem Druck nicht nach, sondern verbleibt ortsfest. Auch die Kontaktstif e 11 verbleiben fest in den Glasdurchführungen 15. Die mechanische Belastung verbleibt also vollständig in dem Wirkteil 18. Sie wird nicht auf das Elektronikteil 19 und die darin angeordnete empfindliche Anzündeleketronik 14 übertragen. Dadurch ist sichergestellt, daß die Anzündelektronik 14 auch nach dem Anzündvorgang funktionsfähig ist. Somit können die anderen an den Bus angeschlossenen Elemente auch weiterhin ungestört miteinander kommunizieren. Zudem kann die Anzündelektronik 14 des bereits ausgelösten Anzündelements noch Signale empfangen und ausgeben. So kann die Anzündelektronik 14 beispielsweise über eine Messung der Änderung des Widerstandes zwischen den beiden Kontaktbuchsen 17 detektieren, daß die Anzündladung 7 ausgelöst wurde und ein Ausgangssignal über die Anschlußstifte 21 an die Steuereinheit ausgeben. The pressure generated during the ignition process also exerts a force on the bushing base. Since the bushing base 9 is firmly connected to the housing 2 by means of the circumferential weld seam 10, it does not give in to the pressure, but remains stationary. The contact pins 11 also remain fixed in the glass bushings 15. The mechanical load therefore remains completely in the active part 18. It is not transmitted to the electronic part 19 and the sensitive ignition electronics 14 arranged therein. This ensures that the ignition electronics 14 are functional even after the ignition process. This means that the other elements connected to the bus can continue to communicate with each other undisturbed. In addition, the ignition electronics 14 of the already triggered ignition element can still receive and output signals. The ignition electronics 14 can detect, for example, by measuring the change in the resistance between the two contact sockets 17, that the ignition charge 7 has been triggered and output an output signal via the connecting pins 21 to the control unit.

Claims

PATENTA SPRUCHE PATENTA SPEECH
1. Pyrotechnisches Anzündelement, insbesondere zum Auslösen eines Rückhaltesystems, mit1. Pyrotechnic ignition element, in particular for triggering a restraint system with
einem Wirkteil (18) mit einem Gehäuse (2) , das eine Anzündladung (7) , eine Zündbrücke (6) zum Anzünden der Anzündladung (7) und mindestens ein an einem Durchführungssockel (9) angeordnetes und mit der Zündbrücke (6) verbundenes Kontaktelement (11) zum Anlegen eines Anzündstroms enthält, undan active part (18) with a housing (2) which contains an ignition charge (7), an ignition bridge (6) for igniting the ignition charge (7) and at least one contact element arranged on a bushing base (9) and connected to the ignition bridge (6) (11) for applying an ignition current, and
einem Elektronikteil (19) , das eine Anzündelektronik (14) zur Bereitstellung eines Anzündstroms aufweist,an electronic part (19) which has ignition electronics (14) for providing an ignition current,
wobei der Durchführungssockel (9) fest und abdichtend mit dem Gehäuse (2) verbunden ist und wobei das Gehäuse (2) den Durchführungssockel (9) des Wirkteils (18) überragt und das Elektronikteil (19) als selbständige Einheit enthält, die über Kontaktelemente (11,17) elektrisch mit dem Wirkteil (18) verbunden ist.wherein the bushing base (9) is firmly and sealingly connected to the housing (2) and the housing (2) projects beyond the bushing base (9) of the active part (18) and contains the electronic part (19) as an independent unit that is connected via contact elements ( 11, 17) is electrically connected to the active part (18).
2. Anzündelement nach Anspruch 1, dadurch gekennzeichnet, daß das Elektronikteil (19) ein Bodenstück (16) aufweist, das fest und abdichtend mit dem Gehäuse (2) verbunden ist und durch das mindestens ein Anschlußelement (21) hindurchgeführt ist.2. Ignition element according to claim 1, characterized in that the electronic part (19) has a bottom piece (16) which is firmly and sealingly connected to the housing (2) and through which at least one connecting element (21) is passed.
3. Anzündelement nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Durchführungssockel (9) des Wirkteils (18) und/oder das Bodenstück (16) des Elektronikteils (19) mit einer umlaufenden Schweißnaht (10) an dem Gehäuse (22) befestigt ist .3. Ignition element according to claim 1 or 2, characterized in that the bushing base (9) of the The active part (18) and / or the base piece (16) of the electronic part (19) is attached to the housing (22) with a circumferential weld seam (10).
Anzündelement nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß die Kontaktelemente (11,17) des Wirkteils (18) und des Elektronikteils (19) als Stift -Buchsen-Verbindung ausgebildet sind.Ignition element according to one of Claims 1-3, characterized in that the contact elements (11, 17) of the active part (18) and of the electronic part (19) are designed as a pin-socket connection.
Anzündelement nach einem der Ansprüche 1-4, dadurch gekennzeichnet, daß die Kontaktelemente (11,17) des Wirkteils (18) und des Elektronikteils (19) durch Federkraft in gegenseitiger Anlage gehalten sind.Ignition element according to one of claims 1-4, characterized in that the contact elements (11, 17) of the active part (18) and the electronic part (19) are held in mutual contact by spring force.
Anzündelement nach einem der Ansprüche 1-4, dadurch gekennzeichnet, daß die Kontaktelemente (11,17) des Wirkteils (18) und des Elektronikteils (19) mit elektrisch leitendem Kleber zusammengehalten sind.Ignition element according to one of claims 1-4, characterized in that the contact elements (11, 17) of the active part (18) and the electronic part (19) are held together with electrically conductive adhesive.
Anzündelement nach einem der Ansprüche 1-6, dadurch gekennzeichnet, daß der Durchführungssockel (9) des Wirkteils (18) und/oder das Bodenstück (16) des Elektronikteils (19) jeweils mindestens eine Glaseinschmelzung (15,-22) aufweist, durch welche das Kontaktelement des Wirkteils (18) bzw. das Anschlußelement (21) des Elektronikteils (19) fest und abdichtend geführt ist . Ignition element according to one of claims 1-6, characterized in that the bushing base (9) of the active part (18) and / or the base piece (16) of the electronic part (19) each have at least one glass melt (15, -22) through which the contact element of the active part (18) or the connection element (21) of the electronic part (19) is guided firmly and sealingly.
8. Anzündelement nach einem der Ansprüche 1-7, dadurch gekennzeichnet, daß die Anzündelektronik8. Ignition element according to one of claims 1-7, characterized in that the ignition electronics
(14) durch Programmiersignale an den Anschlußelementen (21) programmierbar ist.(14) is programmable by programming signals on the connection elements (21).
9. Anzündelement nach einem der Ansprüche 1-8, dadurch gekennzeichnet, daß die Anzündelektronik (14) einen Kommunikationsteil zum Betreiben des9. Ignition element according to one of claims 1-8, characterized in that the ignition electronics (14) have a communication part for operating the
Anzündelements (1) an einem Bussystem enthält.Ignition element (1) contains on a bus system.
10. Anzündelement nach einem der Ansprüche 1-9, dadurch gekennzeichnet, daß die Anzündelektronik10. Ignition element according to one of claims 1-9, characterized in that the ignition electronics
(14) einen Energiespeicher enthält, der mit einem Eingangssignal aufladbar ist und der bei Entladung den Anzündstrom erzeugt . (14) contains an energy store which can be charged with an input signal and which generates the ignition current when discharged.
EP99938368A 1998-08-11 1999-07-29 Pyrotechnic ignition element with integrated electronic system, for triggering a restraint system Ceased EP1104367A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19836280A DE19836280C1 (en) 1998-08-11 1998-08-11 Pyrotechnic igniter with integrated electronics to trigger a restraint system
DE19836280 1998-08-22
PCT/EP1999/005421 WO2000009366A1 (en) 1998-08-11 1999-07-29 Pyrotechnic ignition element with integrated electronic system, for triggering a restraint system

Publications (1)

Publication Number Publication Date
EP1104367A1 true EP1104367A1 (en) 2001-06-06

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EP99938368A Ceased EP1104367A1 (en) 1998-08-11 1999-07-29 Pyrotechnic ignition element with integrated electronic system, for triggering a restraint system

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DE (1) DE19836280C1 (en)
WO (1) WO2000009366A1 (en)

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DE19940201C1 (en) * 1999-08-25 2001-01-11 Daimler Chrysler Ag Pyrotechnical ignition system with integrated ignition circuit has component with flat outer surface(s) that is non-conducting in at least some areas acting as bearer for other components
EP1101667B1 (en) 1999-11-22 2004-01-02 Hirschmann Austria GmbH Igniter
FR2813118B1 (en) 2000-08-17 2003-03-07 Livbag Snc ELECTRO-PYROTECHNIC IGNITER WITH TWO IGNITION HEADS AND USE IN AUTOMOTIVE SAFETY
DE10123282A1 (en) 2001-05-12 2002-11-14 Conti Temic Microelectronic Pyrotechnic ignition device with integrated electronics module
DE10123284A1 (en) 2001-05-12 2002-11-14 Conti Temic Microelectronic Pyrotechnic ignition device with integrated electronics module
JP4537210B2 (en) * 2002-12-25 2010-09-01 日本化薬株式会社 Gas generator
US10209041B2 (en) 2014-11-17 2019-02-19 Ems-Patvag s.r.o. Detonator for passenger restraint systems
DE102014016923B3 (en) * 2014-11-17 2016-02-25 Elisabeth Dürschinger Primer for occupant restraint systems
DE102015014124A1 (en) 2015-11-03 2017-05-04 Ems-Patvag s.r.o. Primer for occupant restraint systems

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DE19610799C1 (en) * 1996-03-19 1997-09-04 Siemens Ag Ignition device for triggering a restraint in a motor vehicle
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