EP1780468B1 - Bougie de préchauffage avec capteur de pression - Google Patents

Bougie de préchauffage avec capteur de pression Download PDF

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Publication number
EP1780468B1
EP1780468B1 EP06021416A EP06021416A EP1780468B1 EP 1780468 B1 EP1780468 B1 EP 1780468B1 EP 06021416 A EP06021416 A EP 06021416A EP 06021416 A EP06021416 A EP 06021416A EP 1780468 B1 EP1780468 B1 EP 1780468B1
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EP
European Patent Office
Prior art keywords
pressure
support tube
pressure sensor
heater element
plug body
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.)
Not-in-force
Application number
EP06021416A
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German (de)
French (fr)
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EP1780468A3 (en
EP1780468A2 (en
Inventor
Bernd Last
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BorgWarner Ludwigsburg GmbH
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Beru AG
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Publication of EP1780468A3 publication Critical patent/EP1780468A3/en
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Publication of EP1780468B1 publication Critical patent/EP1780468B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/028—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs the glow plug being combined with or used as a sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F23Q2007/002—Glowing plugs for internal-combustion engines with sensing means

Definitions

  • the invention relates to a Druckmessglüh adopted, in particular a Druckmessglühkerze with an electric heating element and a pressure sensor to which a lying on the heating element pressure is transmitted.
  • the features of the preamble of claim 1 are made DE 103 46 330 A1 known.
  • a pressure measuring annealing device or a pressure measuring glow plug with a heating rod as shown DE 10346 330A1 is known, is used in self-igniting internal combustion engines and in addition to the usual annealing function has a pressure measurement function, via which, for example, the pressure prevailing in the cylinder of the internal combustion engine pressure can be determined.
  • the object underlying the invention is to sheep a Druckmessglüh adopted, especially for a Druckmessglühkerze, which has a simple structure and is associated accordingly with low costs.
  • the single FIGURE shows a sectional view of the combustion chamber side part of a Druckmessglühkerze with the embodiment of the invention DruckmessSWstabes.
  • the Druckmessglühkerzenteil shown in the drawing essentially comprises a heating element 1, 2, 3, 4, which is arranged in a plug body 5 so that it projects axially thereof from the combustion chamber side.
  • the plug body 5 is sealed by a sealing seat 8 to the cylinder head of the internal combustion engine.
  • the heating rod 1, 2, 3, 4 consists of a heating element 1, which is preferably formed of a ceramic material, and a heating element 1 outside and in the combustion chamber side part with a certain play surrounding support tube 2.
  • a pressure sensor 3, for example, a piezoelectric Element may be and generates an electrical signal responsive to a mechanical stress, is arranged with a certain play between the heating element 1 and the support tube 2 such that a combustion chamber side lying on the heating element pressure is transmitted to the pressure sensor 3.
  • the support tube 2 may be made of a metal material, i. an electrically conductive material, so that it contacts the heating element 1, which is electrically contacted on the one hand via an inner pole 6, on the other hand via an outer pole 7 and thereby ensures the current return at the outer pole 7.
  • the support tube 2 is axially stretchable, clamped with the heating element 1 in the axial direction and forms together with the pressure sensor 3, a power circuit responsive to external pressures, such as the combustion pressures inside the cylinder of the internal combustion engine.
  • the axial extensibility of the support tube 2 can be adapted to the particular needs of the measurement task, that provided on the support tube 2, one or more bellows-like deformations are. Due to the formation of these bellows-like deformations, the elasticity in the axial direction can be adjusted as desired.
  • a press-in sleeve 4 is provided on the connection side in the support tube 2 so that it closes the power circuit.
  • the support tube 2 is crimped on the press-in sleeve 4, wherein the press-in sleeve 4 serves as a stable element, which makes it possible to compress the entire assembly of heating element 1, support tube 2, press-fit 4 and pressure sensor 3 tight in the plug body 5. This can be done by pressing the heating element 1 into the press-fit sleeve 4 or by radial force in the region of the press-in sleeve 4.
  • the contacting of the heating element 1 is effected by means of suitable lines which are integrated in the press-fit sleeve 4 or via a contact between the heating element 1 and the press-in sleeve 4.
  • the support tube 2 is arranged under an axial bias directly on the heating element 1 and is the pressure sensor 3 in the space between the heating element 1 and the support tube. 2
  • the support tube 2 has several functions, namely the construction of a bias voltage on the heating element 1, the power transmission to the pressure sensor 3 by the aforementioned support tube 2 is relieved, the support of the heating element 1, the power transmission of heating element 1 and the seal in the plug body fifth
  • the heating element 1 runs axially continuously from the combustion chamber side to the connection side to the inner pole 6 located there, it is also possible that the heating element 1 ends on the combustion chamber side of the pressure sensor 3 and this not as in the illustrated Embodiment in the form of a ring but as a solid, for example, cuboid or solid cylindrical element formed is.
  • the electrical connection is achieved instead of via the inner pole 6 in the illustrated embodiment via an external power supply.
  • the pressure sensor 3 consists for example of a temperature-stable piezoelectric quartz element or of an element of a piezoelectric functional ceramic.
  • a linear pressure / charge conversion can be set, which can be converted via a suitable electronics in a conventional voltage signal as the sensor output signal. Due to the thermally exposed mounting position, it is preferable to provide a temperature compensation of the measurement signal in the electronics.
  • the heating rod has been described in a Druckmessglühkerze with a plug body 5
  • the heating element can be used in any Druckmessglüh observed having a corresponding support for the heating element.
  • the heating element in the connection-side region in particular in the region of the press-in sleeve 4 in the holder fixedly arranged, for example, is press-fitted. It is also possible to weld the heating element in such a holder, in which case the press-in sleeve 4 does not necessarily have to be provided.
  • the pressure sensor of deformations of the holder e.g. the cylinder head of an internal combustion engine, in which the heating element is arranged, is decoupled.
  • the pressure measuring device operates in the following way: Due to the axially strained arrangement of the support tube 2 on the heating element 1 is located on the pressure sensor 3, an axial bias. If the heating element is subjected to an external pressure, this adds to the already existing on the pressure sensor 3 bias in Form of an additional force. The resulting voltage signal is tapped and processed to a pressure applied to the heating element 1 reproducing pressure signal.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Fluid Pressure (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Abstract

The rod has an electrical heating unit (1), and a pressure sensor (3) on which the pressure lying at the heating unit is transferred. The heating unit is surrounded from outside by an axial support pipe (2), which is kept in the heating unit under axial pre-stressing. The pressure sensor is arranged in a designed space between the heating unit and the support pipe. A pressing sleeve (4) is arranged in the support pipe on a side of the pressure sensor.

Description

Die Erfindung betrifft eine Druckmessglüheinrichtung, insbesondere eine Druckmessglühkerze mit einem elektrischen Heizelement und einem Drucksensor, auf den ein am Heizelement liegender Druck übertragen wird. Die Merkmale des Oberbegriffes des Anspruches 1 sind aus DE 103 46 330 A1 bekannt.The invention relates to a Druckmessglüheinrichtung, in particular a Druckmessglühkerze with an electric heating element and a pressure sensor to which a lying on the heating element pressure is transmitted. The features of the preamble of claim 1 are made DE 103 46 330 A1 known.

Eine Druckmessglüheinrlchtung oder eine Druckmessglühkerze mit einem Heizstab, wie aus DE 10346 330A1 bekannt, wird bei selbstzündenden Brennkraftmaschinen verwandt und hat neben der üblichen Glühfunktion eine Druckmessfunktion, über die beispielsweise der im Zylinder der Brennkraftmaschine herrschende Druck ermittelt werden kann.A pressure measuring annealing device or a pressure measuring glow plug with a heating rod, as shown DE 10346 330A1 is known, is used in self-igniting internal combustion engines and in addition to the usual annealing function has a pressure measurement function, via which, for example, the pressure prevailing in the cylinder of the internal combustion engine pressure can be determined.

Übliche Druckmessglüheinrichtungen weisen einen Heizstab und einen Drucksensor auf, der durch den im Zylinder der Brennkraftmaschine herrschenden Druck beaufschlagt wird, der über den Heizstab auf den Drucksensor übertragen wird.Conventional Druckmessglüheinrichtungen have a heating element and a pressure sensor which is acted upon by the prevailing pressure in the cylinder of the internal combustion engine, which is transmitted via the heating element to the pressure sensor.

Druckmessgiüheinrichtungen oder Druckmessglühkerzen, die einen Heizstab und einen Drucksensor umfassen, sind beispielsweise aus der DE 103 43 521 A1 , DE 10 2004 044 727 A1 , der DE 10 2004 024 . 341 A1, der WO2005/043039 A1 und der WO2005/040681 A1 bekannt.Druckmessgiüheinrichtungen or Druckmessglühkerzen comprising a heating element and a pressure sensor are, for example, from DE 103 43 521 A1 . DE 10 2004 044 727 A1 , of the DE 10 2004 024 , 341 A1, the WO2005 / 043039 A1 and the WO2005 / 040681 A1 known.

Aufgrund der voluminösen Geometrie und des Gewichtes der Druck- oder Kraftübertragungseinrichtungen zum Drucksensor liegt bei diesen bekannten Einrichtungen soft eine Störungen hervorrufende Eigenfrequenzsituation innerhalb des Messbandes vor.Due to the voluminous geometry and the weight of the pressure or power transmission devices to the pressure sensor is soft in these known devices before a disturbing natural frequency situation within the tape.

Die der Erfindung zugrunde liegende Aufgabe besteht daher darin, eine Druckmessglüheinrichtung, insbesondere für eine Druckmessglühkerze zu schafen, die einen einfachen Aufbau hat und dementsprechenden mit geringen Kosten verbunden ist.Therefore, the object underlying the invention is to sheep a Druckmessglüheinrichtung, especially for a Druckmessglühkerze, which has a simple structure and is associated accordingly with low costs.

Diese Aufgabe wird durch eine Druckmessglüheinrichtüng der im Anspruch 1 angegebenen Art gelöst.This object is achieved by a Druckmessglüheinrichtg specified in claim 1.

Bei der erfindungsgemäßen Druckmessglüheinrichtung ist die 0Druckmesseinrichtung in den Heizstab integriert, werden keine speziellen Dichtungen und Führungen benötigt, was die Kosten herabsetzt, und kann durch Miniaturisierung die Eigenfrequenzproblematik vermieden werden.In the Druckmessglüeinrichtung invention the 0Druckmesseinrichtung is integrated into the heating element, no special Seals and guides required, which reduces the cost, and can be avoided by miniaturization the natural frequency problem.

Besonders bevorzugte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Druckmessglüheihrichtung sind Gegenstand der Ansprüche 2 bis 8.Particularly preferred embodiments and further developments of Druckmessglüheihrichtung invention are the subject of claims 2 to 8.

Im Folgenden wird anhand der zugehörigen Zeichnung ein besonders bevorzugtes Ausführungsbeispiel der erfindungsgemäßen Druckmessglüheinrichtung näher beschrieben.In the following, a particularly preferred embodiment of the Druckmessglüeinrichtung invention will be described in detail with reference to the accompanying drawings.

Die einzige Figur zeigt in einer Schnittansicht den brennraumseitigen Teil einer Druckmessglühkerze mit dem Ausführungsbeispiel des erfindungsgemäßen Druckmessheizstabes.The single FIGURE shows a sectional view of the combustion chamber side part of a Druckmessglühkerze with the embodiment of the invention Druckmessheizstabes.

Der in der Zeichnung dargestellte Druckmessglühkerzenteil umfasst im Wesentlichen einen Heizstab 1, 2, 3, 4, der in einem Kerzenkörper 5 so angeordnet ist, dass er davon brennraumseitig axial vorsteht. Der Kerzenkörper 5 ist durch einen Dichtsitz 8 zum Zylinderkopf der Brennkraftmaschine abgedichtet.The Druckmessglühkerzenteil shown in the drawing essentially comprises a heating element 1, 2, 3, 4, which is arranged in a plug body 5 so that it projects axially thereof from the combustion chamber side. The plug body 5 is sealed by a sealing seat 8 to the cylinder head of the internal combustion engine.

Der Heizstab 1, 2, 3, 4 besteht aus einem Heizelement 1, das vorzugsweise aus einem keramischen Material gebildet ist, und einem das Heizelement 1 außen und im brennraumseitigen Teil mit einem gewissen Spiel umgebenden Stützrohr 2. Ein Drucksensor 3, der beispielsweise ein piezoelektrisches Element sein kann und auf eine mechanische Spannung ansprechend ein elektrisches Signal erzeugt, ist mit einem gewissen Spiel zwischen dem Heizelement 1 und dem Stützrohr 2 derart angeordnet, dass ein brennraumseitig am Heizstab liegender Druck auf den Drucksensor 3 übertragen wird.The heating rod 1, 2, 3, 4 consists of a heating element 1, which is preferably formed of a ceramic material, and a heating element 1 outside and in the combustion chamber side part with a certain play surrounding support tube 2. A pressure sensor 3, for example, a piezoelectric Element may be and generates an electrical signal responsive to a mechanical stress, is arranged with a certain play between the heating element 1 and the support tube 2 such that a combustion chamber side lying on the heating element pressure is transmitted to the pressure sensor 3.

Das Stützrohr 2 kann aus einem Metallmaterial, d.h. einem elektrisch leitenden Material bestehen, so dass es das Heizelement 1, das zum einen über einen Innenpol 6 elektrisch kontaktiert ist, zum anderen über einen Außenpol 7 kontaktiert und dabei für die Stromrückführung am Außenpol 7 sorgt.The support tube 2 may be made of a metal material, i. an electrically conductive material, so that it contacts the heating element 1, which is electrically contacted on the one hand via an inner pole 6, on the other hand via an outer pole 7 and thereby ensures the current return at the outer pole 7.

Das Stützrohr 2 ist axial dehnfähig, mit dem Heizelement 1 in axialer Richtung verspannt und bildet zusammen mit dem Drucksensor 3 einen Kraftkreislauf, der auf äußere Drücke, wie beispielsweise die Verbrennungsdrücke im Inneren des Zylinders der Brennkraftmaschine anspricht.The support tube 2 is axially stretchable, clamped with the heating element 1 in the axial direction and forms together with the pressure sensor 3, a power circuit responsive to external pressures, such as the combustion pressures inside the cylinder of the internal combustion engine.

Die axiale Dehnfähigkeit des Stützrohres 2 kann dadurch an die jeweiligen Bedürfnisse der Messaufgabe angepasst werden, dass am Stützrohr 2 ein oder mehrere faltenbalgartige Verformungen vorgesehen sind. Durch die Ausbildung dieser faltenbalgartigen Verformungen kann die Dehnfähigkeit in axialer Richtung nach Wunsch eingestellt werden.The axial extensibility of the support tube 2 can be adapted to the particular needs of the measurement task, that provided on the support tube 2, one or more bellows-like deformations are. Due to the formation of these bellows-like deformations, the elasticity in the axial direction can be adjusted as desired.

Eine Einpresshülse 4 ist anschlussseitig im Stützrohr 2 so vorgesehen, dass sie den Kraftkreislauf schließt. Hierzu ist das Stützrohr 2 über die Einpresshülse 4 verbördelt, wobei die Einpresshülse 4 als stabiles Element dient, das es ermöglicht, die gesamte Baugruppe aus Heizelement 1, Stützrohr 2, Einpresshülse 4 und Drucksensor 3 dicht im Kerzenkörper 5 zu verpressen. Das kann durch Einpressen des Heizelements 1 in die Einpresshülse 4 oder durch radiale Krafteinwirkung im Bereich der Einpresshülse 4 erfolgen.A press-in sleeve 4 is provided on the connection side in the support tube 2 so that it closes the power circuit. For this purpose, the support tube 2 is crimped on the press-in sleeve 4, wherein the press-in sleeve 4 serves as a stable element, which makes it possible to compress the entire assembly of heating element 1, support tube 2, press-fit 4 and pressure sensor 3 tight in the plug body 5. This can be done by pressing the heating element 1 into the press-fit sleeve 4 or by radial force in the region of the press-in sleeve 4.

Die Kontaktierung des Heizelementes 1 erfolgt durch geeignete Leitungen, die in die Einpresshülse 4 integriert sind oder über eine Kontaktierung zwischen dem Heizelement 1 und der Einpresshülse 4.The contacting of the heating element 1 is effected by means of suitable lines which are integrated in the press-fit sleeve 4 or via a contact between the heating element 1 and the press-in sleeve 4.

Bei des erfindungsgemäßen Druckmessglüheinrichtung ist somit das Stützrohr 2 unter einer axialen Vorspannung direkt auf dem Heizelement 1 angeordnet und befindet sich der Drucksensor 3 im Bauraum zwischen dem Heizelement 1 und dem Stützrohr 2.In the Druckmessglüheinrichtung invention thus the support tube 2 is arranged under an axial bias directly on the heating element 1 and is the pressure sensor 3 in the space between the heating element 1 and the support tube. 2

Das Stützrohr 2 hat mehrere Funktionen, nämlich des Aufbaus einer Vorspannung am Heizelement 1, der Kraftübertragung auf den Drucksensor 3, indem das vorgenannte Stützrohr 2 entlastet wird, der Stütze des Heizelements 1, der Stromübertragung von Heizelement 1 und der Abdichtung im Kerzenkörper 5.The support tube 2 has several functions, namely the construction of a bias voltage on the heating element 1, the power transmission to the pressure sensor 3 by the aforementioned support tube 2 is relieved, the support of the heating element 1, the power transmission of heating element 1 and the seal in the plug body fifth

Obwohl bei dem oben beschriebenen und in der Zeichnung dargestellten Ausführungsbeispiel das Heizelement 1 axial durchgehend von der Brennraumseite zur Anschlussseite zu dem dort befindlichen Innenpol 6 verläuft, ist es auch möglich, dass das Heizelement 1 brennraumseitig am Drucksensor 3 endet und dieser nicht wie bei dem dargestellten Ausführungsbeispiel in Form eines Ringes sondern als ein massives, beispielsweise quaderförmiges oder massiv zylindrisches Element ausgebildet ist. In diesem Fall wird der elektrische Anschluss statt über den Innenpol 6 bei dem dargestellten Ausführungsbeispiel über eine äußere Stromführung erzielt.Although in the embodiment described above and shown in the drawing, the heating element 1 runs axially continuously from the combustion chamber side to the connection side to the inner pole 6 located there, it is also possible that the heating element 1 ends on the combustion chamber side of the pressure sensor 3 and this not as in the illustrated Embodiment in the form of a ring but as a solid, for example, cuboid or solid cylindrical element formed is. In this case, the electrical connection is achieved instead of via the inner pole 6 in the illustrated embodiment via an external power supply.

Der Drucksensor 3 besteht beispielsweise aus einem temperaturstabilen piezoelektrischen Quarzelement oder aus einem Element aus einer piezoelektrischen Funktionskeramik. Bei einem derartigen Drucksensor lässt sich eine lineare Druck/Ladungswandlung einstellen, die über eine geeignete Elektronik in ein übliches Spannungssignal als Sensorausgangssignal umgesetzt werden kann. Aufgrund der thermisch exponierten Einbaulage ist es bevorzugt, in der Elektronik eine Temperaturkompensation des Messsignals vorzusehen.The pressure sensor 3 consists for example of a temperature-stable piezoelectric quartz element or of an element of a piezoelectric functional ceramic. In such a pressure sensor, a linear pressure / charge conversion can be set, which can be converted via a suitable electronics in a conventional voltage signal as the sensor output signal. Due to the thermally exposed mounting position, it is preferable to provide a temperature compensation of the measurement signal in the electronics.

Obwohl im obigen die Verwendung des Heizstabes bei einer Druckmessglühkerze mit einem Kerzenkörper 5 beschrieben wurde, kann der Heizstab bei einer beliebigen Druckmessglüheinrichtung verwandt werden, die eine entsprechende Halterung für den Heizstab aufweist.Although in the above, the use of the heating rod has been described in a Druckmessglühkerze with a plug body 5, the heating element can be used in any Druckmessglüheinrichtung having a corresponding support for the heating element.

Entscheidend ist, dass der Heizstab im anschlussseitigen Bereich, insbesondere im Bereich der Einpresshülse 4 in der Halterung fest angeordnet beispielsweise pressgepasst ist. Es ist auch möglich, den Heizstab in eine derartige Halterung einzuschweißen, wobei in diesem Fall die Einpresshülse 4 nicht notwendigerweise vorgesehen sein muss.It is crucial that the heating element in the connection-side region, in particular in the region of the press-in sleeve 4 in the holder fixedly arranged, for example, is press-fitted. It is also possible to weld the heating element in such a holder, in which case the press-in sleeve 4 does not necessarily have to be provided.

Durch diese Ausbildung wird erreicht, dass der Drucksensor von Verformungen der Halterung, z.B. des Zylinderkopfes einer Brennkraftmaschine, in dem der Heizstab angeordnet ist, entkoppelt ist.By this design is achieved that the pressure sensor of deformations of the holder, e.g. the cylinder head of an internal combustion engine, in which the heating element is arranged, is decoupled.

Die erfindungsgemäße Druckmessglüheinrichtung arbeitet in der folgenden Weise:
Aufgrund der axial verspannten Anordnung des Stützrohres 2 auf dem Heizelement 1 liegt am Drucksensor 3 eine axiale Vorspannung. Wenn der Heizstab mit einem äußeren Druck beaufschlagt wird, addiert sich dieser zu der am Drucksensor 3 bereits liegenden Vorspannung in Form einer zusätzlichen Kraft. Das daraus resultierende Spannungssignal wird abgegriffen und zu einem den am Heizelement 1 liegenden Druck wiedergebenden Drucksignal verarbeitet.The pressure measuring device according to the invention operates in the following way:
Due to the axially strained arrangement of the support tube 2 on the heating element 1 is located on the pressure sensor 3, an axial bias. If the heating element is subjected to an external pressure, this adds to the already existing on the pressure sensor 3 bias in Form of an additional force. The resulting voltage signal is tapped and processed to a pressure applied to the heating element 1 reproducing pressure signal.

Claims (8)

  1. A pressure-measuring glow device, in particular a pressure-measuring glow plug, for insertion into the cylinder head of an IC engine, comprising a plug body (5) that has a seat (8) on the combustion chamber side to seal the plug body (5) against the cylinder head, and has a heater rod (1, 2, 3) comprising an electrical heater element (1) and a pressure sensor (3) fixedly arranged inside the plug body (5),
    characterized in that
    part of the heater element (1) on the combustion chamber side is surrounded by an axially expandable support tube (2), the pressure sensor (3) is arranged in the space between the heater element (1) and the support tube (2), and the support tube (2) is arranged on the heater element (1) with axial prestress so that the pressure sensor (3) is axially prestressed and decoupled from deformations of the plug body (5).
  2. A pressure-measuring glow device according to Claim 1, characterized in that the heater rod also has a press-fitted sleeve (4) arranged inside the support tube (2) at the connection end.
  3. A pressure-measuring flow device according to Claim 2, characterized in that the heater rod (1, 2, 3) is fixedly arranged inside the plug body (5) only in the region of the press-fitted sleeve (4).
  4. A pressure-measuring glow device according to any one of the preceding claims, characterized in that the heater rod (1, 2, 3) is press-fitted in the plug body (5).
  5. A pressure-measuring glow device according to any one of the preceding claim, characterized in that the pressure sensor (3) is an annular element which fits eternally on the heater element (1), which is rod-shaped and is provided at the connection end with an inner pole (6) and at the combustion chamber end with an outer pole (7) which contacts the support tube (2), the support tube (2) being made of electrically conducting material.
  6. A pressure-measuring glow device according to any one of the receding claims, characterized in that the pressure sensor (3) is formed from a solid element which is contacted by the heater element (1) on the combustion chamber side, electrical power to the heater element (1) being supplied via an external power lead.
  7. A pressure-measuring glow device according to any one of the preceding claims, characterized in that the pressure sensor (3) is seated on a shoulder formed on the heater element (1) on the combustion chamber side.
  8. A pressure-measuring glow device according to any one of the preceding claims, characterized in that the support tube (2) is made axially expandable by the provision of concertina-type deformations.
EP06021416A 2005-10-28 2006-10-12 Bougie de préchauffage avec capteur de pression Not-in-force EP1780468B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005051817A DE102005051817B4 (en) 2005-10-28 2005-10-28 Pressure measuring glow device, in particular pressure measuring glow plug

Publications (3)

Publication Number Publication Date
EP1780468A2 EP1780468A2 (en) 2007-05-02
EP1780468A3 EP1780468A3 (en) 2007-07-25
EP1780468B1 true EP1780468B1 (en) 2011-04-27

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EP06021416A Not-in-force EP1780468B1 (en) 2005-10-28 2006-10-12 Bougie de préchauffage avec capteur de pression

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US (1) US7829824B2 (en)
EP (1) EP1780468B1 (en)
JP (1) JP5230924B2 (en)
KR (1) KR101302439B1 (en)
AT (1) ATE507437T1 (en)
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US20070095811A1 (en) 2007-05-03
DE102005051817B4 (en) 2008-06-05
DE102005051817A1 (en) 2007-05-03
EP1780468A3 (en) 2007-07-25
KR101302439B1 (en) 2013-09-02
ATE507437T1 (en) 2011-05-15
EP1780468A2 (en) 2007-05-02
JP2007120939A (en) 2007-05-17
DE502006009382D1 (en) 2011-06-09
KR20070045965A (en) 2007-05-02
US7829824B2 (en) 2010-11-09
JP5230924B2 (en) 2013-07-10

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