EP1517086A1 - Glow pLug with a pressure sensor for a diesel engine - Google Patents

Glow pLug with a pressure sensor for a diesel engine Download PDF

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Publication number
EP1517086A1
EP1517086A1 EP04020923A EP04020923A EP1517086A1 EP 1517086 A1 EP1517086 A1 EP 1517086A1 EP 04020923 A EP04020923 A EP 04020923A EP 04020923 A EP04020923 A EP 04020923A EP 1517086 A1 EP1517086 A1 EP 1517086A1
Authority
EP
European Patent Office
Prior art keywords
plug body
pressure
heating element
druckmessglühkerze
combustion chamber
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.)
Granted
Application number
EP04020923A
Other languages
German (de)
French (fr)
Other versions
EP1517086B1 (en
Inventor
Michael Haussner
Ulf Wyrwich
Hans Houben
Frank Pechhold
Heinz-Georg Schmitz
Dirk Von Hacht
Marc Gerard Johan Borgers
Albert Ferdinand Zwijze
Paulus Thomas Johannes Genissen
Ronald De Groot
Arie-Jan Kölling
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.)
BorgWarner Ludwigsburg GmbH
Sensata Technologies Holland BV
Original Assignee
Beru AG
Texas Instruments Holland BV
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Publication date
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Publication of EP1517086A1 publication Critical patent/EP1517086A1/en
Application granted granted Critical
Publication of EP1517086B1 publication Critical patent/EP1517086B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • 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 Druckmessglühkerze for a Diesel engine with a plug body for insertion into a cylinder the diesel engine, a heating rod, in the candle body is arranged, and a pressure sensor under a bias arranged between the heating element and the plug body is such that the pressure sensor by the combustion chamber of the Cylinder prevailing pressure is applied to the heating rod is transmitted.
  • a pressure measuring glow plug is on the one hand as a cold start aid for starting the diesel engine at low temperatures or for intermediate annealing at unfavorable Operating conditions and on the other by the Pressure sensor, e.g. from a piezoceramic or a strain gauge can exist information about the combustion process to get in the cylinder, to evaluate this and to control the combustion process accordingly.
  • the Pressure sensor e.g. from a piezoceramic or a strain gauge
  • This object is achieved according to the invention characterized that the heating element in the axial direction slidably displaceable in the Candle body is arranged and the pressure in the combustion chamber of the cylinder transmits to the pressure sensor.
  • the illustrated in Fig. 1 first embodiment of Druckmessglühkerze according to the invention has a heating element. 1 on, which is arranged in a candle body, consisting of two Share, namely an upper or connection-side part 2.2 and a lower or combustion chamber side part 2.1 formed is.
  • the heating element 1 has in the connection-side region reduced diameter on and is in this range with a Membrane 7 provided, which is fixed to the heating element 1.
  • the Membrane 7 is designed to absorb the heat of the heating element 1 on the plug body 2 forwards, the ground connection when operating the Druckmessglühkerze in their annealing function ensures and the arrangement towards the connection side the glow plug gas-tight.
  • the membrane 7 is for this purpose firmly on the front side of the upper body part 2.1, for example attached by laser welding.
  • a contact tube 6 is provided on the glow tube 1.1 of the heating element 1 is attached.
  • the inner pole 1.2 of Heating rod 1 and the Kon-clock tube 6 extend on the connection side beyond the plug housing 2 addition in the connection side Part of the plug housing an O-ring 4 is provided is that the extension of the heating element 1 by means of Contact tube 6 centered in the upper part 2.2 of the candle body.
  • a O-ring 3 is provided, which the heating element 1 with respect to the lower Centered body part 2.1 of the candle body and so seals, that the combustion pressure in the cylinder only via the heating element. 1 is transferred to the membrane 7.
  • the lower part 2.1, the upper part 2.2 of the candle body and the diaphragm 7 therebetween are, for example welded together by laser welding.
  • connection 11 The electrical connection of the Druckmessglühkerze takes place via the connection 11 and the inner pole 1.2 where the connection may be formed in thread form or as a plug connection.
  • An O-ring 5 is at the connection end as a sealing element provided between the inner pole 1.2 and the contact tube 6.
  • a pressure sensor arrangement 9 is located on the front side the connection side of the upper part 2.2 of the plug body and is isolated in contrast.
  • the sensor assembly 9 is under a bias voltage between the plug body 2 and the contact tube 6.
  • a clamping element 10 may be provided, the attached in a suitable manner to the contact tube 6, for example screwed, welded or crimped.
  • the pressure measuring glow plug described above operates with regard to its pressure measurement function as follows:
  • Figs. 2A and 2B is a second embodiment the Druckmessglühkerze invention in two training variants represented, which has the same basic structure as in Fig. 1 illustrated embodiment has.
  • the sensor assembly 9 is insulating on a Paragraph of the contact tube 6, as shown in Fig. 2A is, or on a fixed to the contact tube 6 support ring, as shown in Fig. 2B or directly on the End of the contact tube 6 is placed and with the clamping element 10th braced relative to the upper part 2.2 of the candle body.
  • FIGS. 1 and 2 show a third embodiment of Druckmessglühkerze invention, the basic structure of the invention Basic construction of the first two embodiments corresponds which are shown in Figs. 1 and 2.
  • a sensor element 8 for example a strain gauge is in the embodiment shown in Fig. 3A on a flexibly designed in the axial direction defined Carrier element 9, for example in the form of a cup diaphragm applied and directly between the contact tube 6 and the upper Part 2.2 of the plug body 2, for example by welding fixed.
  • the sensor element for. B. the Strain gauges mounted radially.
  • this training variant becomes a load or deformation on the sensor element not only in the axial direction but also in the radial direction detected.
  • Fig. 4 shows an embodiment of the invention Pressure measuring glow plug, in which the plug body 2 is in one piece and attached to its combustion chamber end, a diaphragm 7 which is the same function as the membrane 7 at the in Fig. 1 illustrated embodiment has.
  • the membrane 7 However, in the embodiment shown in Fig. 4 is used at the same time as a seal of the candle body or supplies the sealing surface for sealing the plug body due its outer fixation relative to the cylinder head 20th
  • the plug body 2 is integrally formed, wherein the inner seal of the plug body 2 to the heating element. 1 opposite the combustion chamber and from the outside via a combination achieved by O-rings 3 and 4, and the O-ring 4 also serves to extend the extended by the contact tube 6 heating rod 1 Center.
  • a sliding element 12 provided between the plug body 2 and the Heating rod 1 is seated.
  • the sliding element can also be between the plug body 2 and the contact tube 6, and serves for guiding the heating rod 1 and the main centering of the Heating rod 1 relative to the plug body 2.
  • Fig. 5A shows the variant in which the sensor arrangement Deviating from the arrangement in Fig. 1 on a paragraph of Contact tube 6 rests
  • Fig. 5B shows the variant in which the sensor assembly rests on a ring, the contact tube 6 of the heating rod 1 is fixed
  • Fig. 5C shows a Variant with a sensor arrangement according to FIG. 3A.
  • FIG. 6A and 6B show another embodiment of the Druckmessglühkerze according to the invention, in its construction and its operation in the embodiment shown in Fig. 5 corresponds, but missing the slider. Instead, the heating element 1 is floating in the plug body 2 via the O-rings 3 and 4 stored.
  • the ground connection from the heating element 1 to the plug body 2 can in this embodiment via a separate ground line or directly via the carrier element shown in Fig. 3 take place in the sensor arrangement 9.
  • the Heating rod 1 in the plug body 2 for example via a membrane, a sliding element and / or O-rings movably arranged, what the resulting from the combustion in the combustion chamber of the cylinder Reduced pressures on the candle body. This will be the Candle body from the force curve by the combustion pressure released.

Abstract

Diesel motor glow plug has a heating rod (1) mounted in the body (2.1, 2.2) of the glow plug so that it can slide axially due to pressure changes in the combustion chamber. The rod is held by a membrane (7) and or seals (3), which mean that it can be axially displaced so that it transmits a pressure to a pressure sensor.

Description

Die Erfindung betrifft eine Druckmessglühkerze für einen Dieselmotor mit einem Kerzenkörper zum Einsetzen in einen Zylinder des Dieselmotors, einem Heizstab, der im Kerzenkörper angeordnet ist, und einem Drucksensor, der unter einer Vorspannung zwischen dem Heizstab und dem Kerzenkörper angeordnet ist, derart, dass der Drucksensor durch den im Brennraum des Zylinders herrschenden Druck beaufschlagt wird, der vom Heizstab übertragen wird.The invention relates to a Druckmessglühkerze for a Diesel engine with a plug body for insertion into a cylinder the diesel engine, a heating rod, in the candle body is arranged, and a pressure sensor under a bias arranged between the heating element and the plug body is such that the pressure sensor by the combustion chamber of the Cylinder prevailing pressure is applied to the heating rod is transmitted.

Eine derartige Druckmessglühkerze ist aus der EP 1 096 141 A3 bekannt. Such a pressure measuring glow plug is known from EP 1 096 141 A3 known.

Bei dieser bekannten Druckmessglühkerze sind der Kerzenkörper und der Heizstab brennraumseitig fest miteinander verbunden und hat der Kerzenkörper eine Festigkeit derart, dass er sich beim Anliegen eines Druckes elastisch radial verformen kann. Der Druck im Brennraum des Zylinders wirkt auf den Kerzenkörper und den Heizstab, so dass sich der Kerzenkörper, der fest im Zylinder der Brennkraftmaschine sitzt, elastisch verformt, während sich der Heizstab axial relativ zum Kerzenkörper bewegt. Durch diese axiale Relativbewegung zum Kerzenkörper wird der unter einer Vorspannung stehende Drucksensor entlastet, wobei der Unterschied im Ladungszustand zwischen dem belasteten und dem entlasteten Zustand als Signal für den im Brennraum herrschenden Druck abgenommen und ausgewertet wird.In this known Druckmessglühkerze the candle body and the heating rod on the combustion chamber side firmly connected and the candle body has a strength such that he deformed elastically when applying a pressure radially can. The pressure in the combustion chamber of the cylinder acts on the plug body and the heating element, so that the candle body, the firmly seated in the cylinder of the internal combustion engine, elastically deformed, while the heating element is axially relative to the plug body emotional. By this axial relative movement to the plug body is relieved of the biased pressure sensor, the difference in charge state between the loaded and the unloaded state as a signal for the im Combustion chamber prevailing pressure is removed and evaluated.

Der Zweck einer derartigen Druckmessglühkerze besteht darin, einerseits als Kaltstarthilfe zum Starten des Dieselmotors bei tiefen Temperaturen bzw. zum Zwischenglühen bei ungünstigen Betriebsverhältnissen zu sorgen und andererseits durch den Drucksensor, der z.B. aus einer Piezokeramik oder einem Dehnungsmessstreifen bestehen kann, Informationen über den Verbrennungsablauf im Zylinder zu erhalten, diese auszuwerten und den Verbrennungsablauf dementsprechend zu steuern. Durch den Einsatz einer derartigen Druckmessglühkerze ergibt sich ein Dieselmotor, der in Hinblick auf die Reduzierung der Abgase und des Verbrauchs regelbar ist.The purpose of such a pressure measuring glow plug is on the one hand as a cold start aid for starting the diesel engine at low temperatures or for intermediate annealing at unfavorable Operating conditions and on the other by the Pressure sensor, e.g. from a piezoceramic or a strain gauge can exist information about the combustion process to get in the cylinder, to evaluate this and to control the combustion process accordingly. By the Use of such a Druckmessglühkerze results Diesel engine, with regard to the reduction of exhaust gases and the consumption is regulated.

Nachteilig bei der bekannten Druckmessglühkerze ist es allerdings, dass die Druckübertragung auf den Drucksensor von der Geometrie und der Festigkeit des Kerzenkörpers abhängt.A disadvantage of the known Druckmessglühkerze, however, that the pressure transfer to the pressure sensor of the geometry and strength of the plug body depends.

Die der Erfindung zugrundeliegende Aufgabe besteht daher darin, eine Druckmessglühkerze der eingangs genannten Art zu schaffen, die so ausgebildet ist, dass die Druckübertragung von der Geometrie und der Festigkeit des Kerzenkörpers unabhängig ist und das Signal für den Druck im Brennraum des Zylinders davon nicht beeinflusst ist. The problem underlying the invention is therefore therein, a Druckmessglühkerze of the type mentioned above create, which is designed so that the pressure transmission independent of the geometry and strength of the plug body is and the signal for the pressure in the combustion chamber of the cylinder it is not affected.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, dass der Heizstab in axialer Richtung gleitend verschiebbar im Kerzenkörper angeordnet ist und den Druck im Brennraum des Zylinders auf den Drucksensor überträgt.This object is achieved according to the invention characterized that the heating element in the axial direction slidably displaceable in the Candle body is arranged and the pressure in the combustion chamber of the cylinder transmits to the pressure sensor.

Besonders bevorzugte Ausbildungen und Weiterbildungen der erfindungsgemäßen Druckmessglühkerze sind Gegenstand der Ansprüche 2 bis 10.Particularly preferred embodiments and further developments of Druckmessglühkerze invention are the subject of the claims 2 to 10.

Bei der erfindungsgemäßen Druckmessglühkerze erfolgt eine direkte Weiterleitung des Verbrennungsdruckes über den Heizstab, ohne dass die Geometrie und die Festigkeit des Kerzenkörpers einen Einfluss haben oder eingebunden sind. Dabei werden alle üblichen Funktionen der Glühkerze beibehalten.In the Druckmessglühkerze invention takes place direct forwarding of the combustion pressure via the heating element, without the geometry and strength of the candle body have an influence or are involved. It will be Maintain all the usual functions of the glow plug.

In dieser Weise werden Informationen zur aktuellen Verbrennung erhalten, ist eine Auswertung und ein direkter und sofortiger Eingriff in den Verbrennungsvorgang zur Optimierung bezüglich der Reduzierung von Emissionswerten, Verbrauchswerten, der Geräuschreduzierung und der Leistungssteigerung möglich, so dass sich ein dementsprechend geregelter Dieselmotor verwirklichen lässt. Erreicht wird dieses dadurch, dass der Kerzenkörper und der Drucksensor im Wesentlichen unabhängig voneinander vorgesehen sind und nicht fest miteinander gekoppelt sind.In this way, information about the current combustion is an evaluation and is a direct and immediate intervention in the combustion process for optimization with regard to the reduction of emission values, consumption values, the noise reduction and the increase in performance possible, so that is a correspondingly regulated diesel engine can be realized. This is achieved by the fact that the Candle body and the pressure sensor essentially independent are provided from each other and not firmly coupled together are.

Im folgenden werden anhand der zugehörigen Zeichnungen besonders bevorzugten Ausführungsbeispiele der Erfindung näher beschrieben.In the following will be particularly with reference to the accompanying drawings preferred embodiments of the invention in more detail described.

Es zeigen

  • Fig. 1 in einer Schnittansicht ein erstes Ausführungsbeispiel der erfindungsgemäßen Druckmessglühkerze,
  • Fig. 2A und Fig. 2B in Schnittansichten ein zweites Ausführungsbeispiel der erfindungsgemäßen Druckmessglühkerze in zwei Ausbildungsvarianten,
  • Fig. 3A und 3B in Schnittansichten ein drittes Ausführungsbeispiel der erfindungsgemäßen Druckmessglühkerze in zwei Ausbildungsvarianten,
  • Fig. 4 eine Schnittansicht eines vierten Ausführungsbeispiels der erfindungsgemäßen Druckmessglühkerze,
  • Fig. 5A, Fig. 5B und Fig. 5C in Schnittansichten ein fünftes Ausführungsbeispiel der erfindungsgemäßen Glühkerze in drei Ausbildungsvarianten und
  • Fig. 6A und Fig. 6B in Schnittansichten ein sechsten Ausführungsbeispiel der erfindungsgemäßen Druckmessglühkerze in zwei Varianten.
    • Show it
  • 1 is a sectional view of a first embodiment of the Druckmessglühkerze invention,
  • 2A and 2B in sectional views, a second embodiment of the invention Druckmessglühkerze in two training variants,
  • 3A and 3B in sectional views, a third embodiment of the invention Druckmessglühkerze in two training variants,
  • 4 shows a sectional view of a fourth exemplary embodiment of the pressure-measuring glow plug according to the invention,
  • Fig. 5A, Fig. 5B and Fig. 5C in sectional views a fifth embodiment of the glow plug according to the invention in three training variants and
  • 6A and 6B are sectional views of a sixth embodiment of the invention Druckmessglühkerze in two variants.

    • Das in Fig. 1 dargestellte erste Ausführungsbeispiel der erfindungsgemäßen Druckmessglühkerze weist eine Heizstab 1 auf, der in einem Kerzenkörper angeordnet ist, der aus zwei Teilen, nämlich einem oberen oder anschlussseitigen Teil 2.2 und einem unteren oder brennraumseitigen Teil 2.1 gebildet ist. Der Heizstab 1 weist im anschlussseitigen Bereich eine reduzierten Durchmesser auf und ist in diesem Bereich mit einer Membran 7 versehen, die am Heizstab 1 befestigt ist. Die Membran 7 ist so ausgebildet, dass sie die Wärme des Heizstabes 1 auf den Kerzenkörper 2 weiterleitet, die Masseverbindung beim Betreiben der Druckmessglühkerze in ihrer Glühfunktion sicherstellt und die Anordnung in Richtung zur Anschlussseite der Glühkerze gasdicht abschließt. Die Membran 7 ist hierzu fest an der Stirnseite des oberen Körperteils 2.1 beispielsweise durch Laserschweißen angebracht.The illustrated in Fig. 1 first embodiment of Druckmessglühkerze according to the invention has a heating element. 1 on, which is arranged in a candle body, consisting of two Share, namely an upper or connection-side part 2.2 and a lower or combustion chamber side part 2.1 formed is. The heating element 1 has in the connection-side region reduced diameter on and is in this range with a Membrane 7 provided, which is fixed to the heating element 1. The Membrane 7 is designed to absorb the heat of the heating element 1 on the plug body 2 forwards, the ground connection when operating the Druckmessglühkerze in their annealing function ensures and the arrangement towards the connection side the glow plug gas-tight. The membrane 7 is for this purpose firmly on the front side of the upper body part 2.1, for example attached by laser welding.

    Von der Membran 7 aus in Richtung zur Anschlussseite der Glühkerze ist ein Kontaktrohr 6 vorgesehen, das auf dem Glührohr 1.1 des Heizstabes 1 befestigt ist. Der Innenpol 1.2 des Heizstabes 1 sowie das Kon-taktrohr 6 erstrecken sich anschlussseitig über das Kerzengehäuse 2 hinaus wobei im anschlussseitigen Teil des Kerzengehäuses ein O-Ring 4 vorgesehen ist, der die Verlängerung des Heizstabes 1 mittels des Kontaktrohres 6 im oberen Teil 2.2 des Kerzenkörpers zentriert.From the membrane 7 in the direction of the connection side of the Glow plug is a contact tube 6 is provided on the glow tube 1.1 of the heating element 1 is attached. The inner pole 1.2 of Heating rod 1 and the Kon-clock tube 6 extend on the connection side beyond the plug housing 2 addition in the connection side Part of the plug housing an O-ring 4 is provided is that the extension of the heating element 1 by means of Contact tube 6 centered in the upper part 2.2 of the candle body.

    Im unteren Teil 2.1 des Kerzenkörper ist gleichfalls ein O-Ring 3 vorgesehen, der den Heizstab 1 bezüglich des unteren Körperteils 2.1 des Kerzenkörpers zentriert und so abdichtet, dass der Verbrennungsdruck im Zylinder nur über den Heizstab 1 auf die Membran 7 übertragen wird.In the lower part 2.1 of the plug body is also a O-ring 3 is provided, which the heating element 1 with respect to the lower Centered body part 2.1 of the candle body and so seals, that the combustion pressure in the cylinder only via the heating element. 1 is transferred to the membrane 7.

    Der untere Teil 2.1, der obere Teil 2.2 des Kerzenkörpers und die dazwischen befindliche Membran 7 sind beispielsweise durch Laserschweißen zusammengeschweißt.The lower part 2.1, the upper part 2.2 of the candle body and the diaphragm 7 therebetween are, for example welded together by laser welding.

    Der elektrische Anschluss der Druckmessglühkerze erfolgt über den Anschluss 11 und den Innenpol 1.2 wobei der Anschluss in Gewindeform oder als Steckanschluss ausgebildet sein kann.The electrical connection of the Druckmessglühkerze takes place via the connection 11 and the inner pole 1.2 where the connection may be formed in thread form or as a plug connection.

    Ein O-Ring 5 ist am anschlussseitigen Ende als Dichtelement zwischen dem Innenpol 1.2 und dem Kontaktrohr 6 vorgesehen.An O-ring 5 is at the connection end as a sealing element provided between the inner pole 1.2 and the contact tube 6.

    Eine Drucksensoranordnung 9 befindet sich stirnseitig auf der Anschlussseite des oberen Teils 2.2 des Kerzenkörpers und ist demgegenüber isoliert. Die Sensoranordnung 9 steht unter einer Vorspannung zwischen dem Kerzenkörper 2 und dem Kontaktrohr 6. Hierzu kann ein Spannelement 10 vorgesehen sein, das in geeigneter Weise am Kontaktrohr 6 befestigt, beispielsweise verschraubt, aufgeschweißt oder aufgekrimpt ist.A pressure sensor arrangement 9 is located on the front side the connection side of the upper part 2.2 of the plug body and is isolated in contrast. The sensor assembly 9 is under a bias voltage between the plug body 2 and the contact tube 6. For this purpose, a clamping element 10 may be provided, the attached in a suitable manner to the contact tube 6, for example screwed, welded or crimped.

    Die oben beschriebene Druckmessglühkerze arbeitet hinsichtlich ihrer Druckmessfunktion wie folgt:The pressure measuring glow plug described above operates with regard to its pressure measurement function as follows:

    Durch den am Heizstab 1 liegenden Druck im Zylinder des Dieselmotors kommt es zu einer axialen Verschiebung des Heizstabes 1 und über die Membran 7 somit des Kontaktrohres 6 relativ zum anschlussseitigen Teil 2.2 des Kerzenkörpers 2. Diese Relativbewegung wird auf die Vorspanneinrichtung, nämlich das Spannelement 10 übertragen und bewirkt eine Entlastung der vorgespannten Drucksensoranordnung 9, woraus sich eine Ladungs- oder Spannungsänderung ergibt, die von einer elektronischen Schaltung erfasst und ausgewertet werden kann. Die Vorspannung der Sensoranordnung 9 hat dabei den Zweck, bei der Sensorentlastung eine verwertbare Signaländerung zu erhalten.By lying on the heating element 1 pressure in the cylinder of Diesel engine, there is an axial displacement of the heating element 1 and the membrane 7 thus the contact tube 6 relative to the connection-side part 2.2 of the plug body 2. This Relative movement is applied to the pretensioner, viz transferred the clamping element 10 and causes a discharge of the biased pressure sensor assembly 9, resulting in a charge or voltage change that results from an electronic Circuit can be detected and evaluated. The bias the sensor assembly 9 has the purpose, in the Sensor relief to obtain a usable signal change.

    Über die Auswertung des Signals der Sensoranordnung 9 sind dann Rückschlüsse auf den jeweiligen Zylinderdruck möglich.About the evaluation of the signal of the sensor array 9 are then conclusions on the respective cylinder pressure possible.

    In den Fig. 2A und 2B ist ein zweites Ausführungsbeispiel der erfindungsgemäßen Druckmessglühkerze in zwei Ausbildungsvarianten dargestellt, das den gleichen Grundaufbau wie das in Fig. 1 dargestellte Ausführungsbeispiel hat.In Figs. 2A and 2B is a second embodiment the Druckmessglühkerze invention in two training variants represented, which has the same basic structure as in Fig. 1 illustrated embodiment has.

    Abweichend von dem in Fig. 1 dargestellten Ausführungsbeispiel ist die Sensoranordnung 9 allerdings isolierend auf einem Absatz des Kontaktrohres 6, wie es in Fig. 2A dargestellt ist, oder auf einem auf dem Kontaktrohr 6 fixierten Auflagering, wie es in Fig. 2B dargestellt ist oder direkt auf dem Ende des Kontaktrohres 6 aufgelegt und mit dem Spannelement 10 gegenüber dem oberen Teil 2.2 des Kerzenkörpers verspannt.Deviating from the embodiment shown in FIG However, the sensor assembly 9 is insulating on a Paragraph of the contact tube 6, as shown in Fig. 2A is, or on a fixed to the contact tube 6 support ring, as shown in Fig. 2B or directly on the End of the contact tube 6 is placed and with the clamping element 10th braced relative to the upper part 2.2 of the candle body.

    Es ist auch möglich den Ansatz zum Auflegen der Sensoranordnung 9 oder den dazu vorgesehenen Auflagering direkt am Innenpol anzuordnen.It is also possible the approach to hang the sensor assembly 9 or the support ring provided for this purpose directly at the inner pole to arrange.

    Bei diesem zweiten Ausführungsbeispiel kommt es durch die Druckbeanspruchung auf den Heizstab 1 durch den im Zylinder herrschenden Druck zu einer Erhöhung der Druckbelastung der Sensoranordnung 9, da die Sensoranordnung 9 stärker gegen das mit dem oberen Teil 2.2 des Glühkerzenkörpers verspannte Spannelement 10 gedrückt wird. Die dadurch auftretende Änderung im Ausgangssignal der Sensoranordnung 9 kann in der gleichen Weise wie beim ersten Ausführungsbeispiel ausgewertet werden.In this second embodiment, it comes through the Compressive stress on the heating element 1 by the cylinder prevailing pressure to increase the pressure load of the Sensor assembly 9, since the sensor assembly 9 stronger against the with the upper part 2.2 of the glow plug body tensioned clamping element 10 is pressed. The resulting change in Output signal of the sensor arrangement 9 can in the same way be evaluated as in the first embodiment.

    Fig. 3A und 3B zeigen ein drittes Ausführungsbeispiel der erfindungsgemäßen Druckmessglühkerze, dessen Grundaufbau dem Grundaufbau der ersten beiden Ausführungsbeispiel entspricht, die in den Fig. 1 und 2 dargestellt sind.3A and 3B show a third embodiment of Druckmessglühkerze invention, the basic structure of the invention Basic construction of the first two embodiments corresponds which are shown in Figs. 1 and 2.

    Ein Sensorelement 8, beispielsweise ein Dehnungsmessstreifen ist bei dem in Fig. 3A dargestellten Ausführungsbeispiel auf einem in axialer Richtung definiert flexibel gestalteten Trägerelement 9 beispielsweise in Form einer Bechermembran aufgebracht und direkt zwischen dem Kontaktrohr 6 und dem oberen Teil 2.2 des Kerzenkörpers 2 beispielsweise durch Schweißung fixiert.A sensor element 8, for example a strain gauge is in the embodiment shown in Fig. 3A on a flexibly designed in the axial direction defined Carrier element 9, for example in the form of a cup diaphragm applied and directly between the contact tube 6 and the upper Part 2.2 of the plug body 2, for example by welding fixed.

    Bei diesem Ausführungsbeispiel kommt es durch die Relativbewegung des Heizstabes 1 und zwar in seiner Verlängerung durch sein Kontaktrohr 6 zum oberen Teil 2.2 des Kerzenkörpers aufgrund eines steigenden Zylinderdruckes zu einer Dehnung des flexibel gestalteten Trägerelementes 9. Durch die daraus resultierende Zugbeanspruchung oder Dehnung des Sensorelementes 8 entsteht eine Signal änderung, die wiederum erfasst und ausgewertet werden kann.In this embodiment, it comes through the relative movement of the heating element 1 in its extension through its contact tube 6 to the upper part 2.2 of the plug body due to an increasing cylinder pressure to an expansion of the flexibly designed carrier element 9. By the resulting Tensile stress or strain of the sensor element 8 creates a signal change, which in turn detected and evaluated can be.

    Bei der in Fig. 3B dargestellten Ausbildungsvariante des dritten Ausführungsbeispiels ist das Sensorelement, z. B. der Dehnungsmeßstreifen radial angebracht. Bei dieser Ausbildungsvariante wird eine Belastung bzw. Verformung am Sensorelement nicht nur in axialer Richtung, sondern auch in radialer Richtung erfasst.In the variant of the training shown in Fig. 3B third embodiment, the sensor element, for. B. the Strain gauges mounted radially. In this training variant becomes a load or deformation on the sensor element not only in the axial direction but also in the radial direction detected.

    Fig. 4 zeigt ein Ausführungsbeispiel der erfindungsgemäßen Druckmessglühkerze, bei dem der Kerzenkörper 2 einteilig ist und an seinem brennraumseitigen Ende eine Membran 7 befestigt ist, die die gleiche Funktion wie die Membran 7 bei dem in Fig. 1 dargestellten Ausführungsbeispiel hat. Die Membran 7 bei dem in Fig. 4 dargestellten Ausführungsbeispiel dient jedoch gleichzeitig als Abdichtung des Kerzenkörpers bzw. liefert die Dichtfläche zur Abdichtung des Kerzenkörpers aufgrund ihrer äußeren Fixierung gegenüber dem Zylinderkopf 20.Fig. 4 shows an embodiment of the invention Pressure measuring glow plug, in which the plug body 2 is in one piece and attached to its combustion chamber end, a diaphragm 7 which is the same function as the membrane 7 at the in Fig. 1 illustrated embodiment has. The membrane 7 However, in the embodiment shown in Fig. 4 is used at the same time as a seal of the candle body or supplies the sealing surface for sealing the plug body due its outer fixation relative to the cylinder head 20th

    Auch bei dem Ausführungsbeispiel, das in Fig. 5 dargestellt ist, ist der Kerzenkörper 2 einteilig ausgebildet, wobei die innere Abdichtung des Kerzenkörpers 2 zum Heizstab 1 gegenüber dem Brennraum und von außen über eine Kombination von O-Ringen 3 und 4 erzielt ist, und der O-Ring 4 auch dazu dient, den durch das Kontaktrohr 6 verlängerten Heizstab 1 zu zentrieren.Also in the embodiment shown in Fig. 5 is, the plug body 2 is integrally formed, wherein the inner seal of the plug body 2 to the heating element. 1 opposite the combustion chamber and from the outside via a combination achieved by O-rings 3 and 4, and the O-ring 4 also serves to extend the extended by the contact tube 6 heating rod 1 Center.

    Bei dem in Fig. 5A dargestellten Ausführungsbeispiel ist zwischen dem Glührohr 1 und dem Kerzenkörper 2 ein Gleitelement 12 vorgesehen, das zwischen dem Kerzenkörper 2 und dem Heizstab 1 sitzt. Das Gleitelement kann auch zwischen dem Kerzenkörper 2 und dem Kontaktrohr 6 angeordnet sein, und dient zur Führung des Heizstabes 1 und zur Hauptzentrierung des Heizstabes 1 gegenüber dem Kerzenkörper 2.In the embodiment shown in Fig. 5A is between the glow tube 1 and the plug body 2, a sliding element 12 provided between the plug body 2 and the Heating rod 1 is seated. The sliding element can also be between the plug body 2 and the contact tube 6, and serves for guiding the heating rod 1 and the main centering of the Heating rod 1 relative to the plug body 2.

    Fig. 5A zeigt die Variante, bei der die Sensoranordnung abweichend von der Anordnung in Fig. 1 auf einem Absatz des Kontaktrohres 6 aufliegt, Fig. 5B zeigt die Variante, bei der die Sensoranordnung auf einem Ring aufliegt, der am Kontaktrohr 6 des Heizstabes 1 befestigt ist, und Fig. 5C zeigt eine Variante mit einer Sensoranordnung gemäß Fig. 3A.Fig. 5A shows the variant in which the sensor arrangement Deviating from the arrangement in Fig. 1 on a paragraph of Contact tube 6 rests, Fig. 5B shows the variant in which the sensor assembly rests on a ring, the contact tube 6 of the heating rod 1 is fixed, and Fig. 5C shows a Variant with a sensor arrangement according to FIG. 3A.

    Sensoranordnung und Arbeitsweise sind im Übrigen gleich denen der Ausführungsbeispiele, die in den Fig. 2 und 3 dargestellt sind.Sensor arrangement and operation are otherwise the same those of the embodiments shown in FIGS. 2 and 3 are.

    Fig. 6A und 6B zeigen ein weiteres Ausführungsbeispiel der erfindungsgemäßen Druckmessglühkerze, das in seinem Aufbau und seiner Arbeitsweise dem in Fig. 5 dargestellten Ausführungsbeispiel entspricht, wobei jedoch das Gleitelement fehlt. Stattdessen ist der Heizstab 1 schwimmend im Kerzenkörper 2 über die O-Ringe 3 und 4 gelagert.6A and 6B show another embodiment of the Druckmessglühkerze according to the invention, in its construction and its operation in the embodiment shown in Fig. 5 corresponds, but missing the slider. Instead, the heating element 1 is floating in the plug body 2 via the O-rings 3 and 4 stored.

    Bei diesem Ausführungsbeispiel ergibt sich die höchste Krafteinleitung vom Heizstab 1 auf das Sensorelement und somit die größte Druckänderung am Sensorelement, was zu einer höheren Ladungsänderung in Abhängigkeit vom anliegenden Druck führt.In this embodiment, the highest results Force introduction from the heating element 1 to the sensor element and thus the largest pressure change on the sensor element, resulting in a higher Charge change depending on the applied pressure leads.

    Die Masseverbindung vom Heizstab 1 auf den Kerzenkörper 2 kann bei diesem Ausführungsbeispiel über eine separate Masseleitung oder direkt über das in Fig. 3 dargestellte Trägerelement in der Sensoranordnung 9 erfolgen. The ground connection from the heating element 1 to the plug body 2 can in this embodiment via a separate ground line or directly via the carrier element shown in Fig. 3 take place in the sensor arrangement 9.

    Die Sensoranordnung und die Arbeitsweise des in Fig. 6 dargestellten Ausführungsbeispiels entsprechen denen bei den Ausführungsbeispielen, die in Fig. 2 und 3 dargestellt sind.The sensor arrangement and the operation of the in Fig. 6 illustrated embodiment correspond to those in the Embodiments, which are shown in FIGS. 2 and 3.

    Bei der erfindungsgemäßen Druckmessglühkerze ist somit der Heizstab 1 im Kerzenkörper 2 beispielsweise über eine Membran, ein Gleitelement und/oder O-Ringe beweglich angeordnet, was die durch die Verbrennung im Brennraum des Zylinders entstehenden Drücke auf den Kerzenkörper reduziert. Dadurch wird der Kerzenkörper vom Kraftverlauf durch den Verbrennungsdruck freigesetzt.In the Druckmessglühkerze invention is thus the Heating rod 1 in the plug body 2, for example via a membrane, a sliding element and / or O-rings movably arranged, what the resulting from the combustion in the combustion chamber of the cylinder Reduced pressures on the candle body. This will be the Candle body from the force curve by the combustion pressure released.

    Claims (10)

    Druckmessglühkerze für einen Dieselmotor mit einem Kerzenkörper zum Einsetzen in einen Zylinder des Dieselmotors einem Heizstab, der im Kerzenkörper angeordnet ist, und einem Drucksensor, der unter einer Vorspannung zwischen dem Heizstab und dem Kerzenkörper angeordnet ist, derart, dass der Drucksensor durch den im Brennraum des Zylinders herrschenden Druck beaufschlagt wird,
       dadurch gekennzeichnet, dass     der Heizstab in axialer Richtung gleitend verschiebbar im Kerzenkörper angeordnet ist und den Druck im Brennraum des Zylinders auf den Drucksensor überträgt.     Pressure measuring glow plug for a diesel engine with a plug body for insertion into a cylinder of the diesel engine a heating rod, which is arranged in the plug body, and a pressure sensor, which is arranged under a bias voltage between the heating rod and the plug body, such that the pressure sensor is acted upon by the pressure prevailing in the combustion chamber of the cylinder,
    characterized in that     the heating element is slidably disposed in the axial direction in the plug body and transmits the pressure in the combustion chamber of the cylinder to the pressure sensor.     Druckmessglühkerze nach Anspruch 1, dadurch gekennzeichnet, dass der Kerzenkörper in axialer Richtung zweiteilig ausgebildet ist und zwischen beiden Teilen eine radiale Membran angeordnet ist, die fest mit dem Heizstab verbunden ist.Druckmessglühkerze according to claim 1, characterized in that the plug body is formed in two parts in the axial direction and between the two parts a radial diaphragm is arranged, which is fixedly connected to the heating element. Druckmessglühkerze nach Anspruch 1, dadurch gekennzeichnet, dass an der brennraumseitigen Stirnseite des Kerzenkörpers eine Membran angeordnet ist, die fest mit dem Heizstab verbunden ist.Druckmessglühkerze according to claim 1, characterized in that on the combustion chamber side end face of the plug body, a membrane is arranged, which is firmly connected to the heating element. Druckmessglühkerze nach Anspruch 2, gekennzeichnet durch einen Gleitkörper, der zwischen dem Heizstab und dem Kerzenkörper angeordnet ist.Druckmessglühkerze according to claim 2, characterized by a sliding body, which is arranged between the heating element and the plug body. Druckmessglühkerze nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass brennraumseitig zwischen dem Kerzenkörper und dem Heizstab eine Dichtung vorgesehen ist.Pressure measuring glow plug according to one of the preceding claims, characterized in that a seal is provided on the combustion chamber side between the plug body and the heating element. Druckmessglühkerze nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass anschlussseitig zwischen dem Kerzenkörper und dem Heizstab eine Dichtung vorgesehen ist.Pressure measuring glow plug according to one of the preceding claims, characterized in that a seal is provided on the connection side between the plug body and the heating element. Druckmessglühkerze nach Anspruch 5, dadurch gekennzeichnet, dass die brennraumseitig zwischen dem Kerzenkörper und dem Heizstab angeordnete Dichtung eine Gleitdichtung ist.Druckmessglühkerze according to claim 5, characterized in that the combustion chamber side arranged between the plug body and the heating element seal is a sliding seal. Druckmessglühkerze nach Anspruch 1, dadurch gekennzeichnet, dass der Drucksensor unter einer Vorspannung zwischen dem Heizstab und dem Kerzenkörper angeordnet ist, derart, dass der Drucksensor durch den im Brennraum des Zylinders herrschenden Druck entlastet wird, der vom Heizstab übertragen wird.Druckmessglühkerze according to claim 1, characterized in that the pressure sensor is arranged under a bias voltage between the heating element and the plug body, such that the pressure sensor is relieved by the pressure prevailing in the combustion chamber of the cylinder pressure, which is transmitted from the heating element. Druckmessglühkerze nach Anspruch 1, dadurch gekennzeichnet, dass der Drucksensor zwischen dem Heizstab und dem Kerzenkörper angeordnet ist, derart, dass der Drucksensor vom im Brennraum herrschenden Druck belastet wird, der vom Heizstab übertragen wird.Druckmessglühkerze according to claim 1, characterized in that the pressure sensor between the heating element and the plug body is arranged, such that the pressure sensor is loaded by the pressure prevailing in the combustion chamber, which is transmitted from the heating element. Druckmessglühkerze nach Anspruch 1, gekennzeichnet durch ein flexibles Trägerelement, das anschlussseitig am Kerzenkörper angebracht ist, und einen auf Dehnung ansprechenden Sensor trägt, wobei der vom Heizstab übertragene Druck zu einer Dehnung des Trägerelementes in axialer Richtung führt.Druckmessglühkerze according to claim 1, characterized by a flexible support member which is mounted on the terminal side of the plug body, and carries a responsive to strain sensor, wherein the pressure transmitted from the heating rod leads to an elongation of the support member in the axial direction.
    EP04020923A 2003-09-19 2004-09-02 Glow Plug with a pressure sensor for a diesel engine Active EP1517086B1 (en)

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    DE10343521A DE10343521A1 (en) 2003-09-19 2003-09-19 Pressure measuring glow plug for a diesel engine
    DE10343521 2003-09-19

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    EP1517086B1 EP1517086B1 (en) 2012-11-14

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    Cited By (15)

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    Publication number Priority date Publication date Assignee Title
    US7759612B2 (en) 2003-10-29 2010-07-20 Continental Automotive France Glow plug comprising a pressure sensor and motor equipped therewith
    US7431003B2 (en) 2004-03-16 2008-10-07 Robert Bosch Gmbh Sheathed-element glow plug having an elastically mounted glow element
    WO2005090865A1 (en) * 2004-03-16 2005-09-29 Robert Bosch Gmbh Sheathed-element heater plug comprising an elastically mounted heater plug
    EP1598651A2 (en) * 2004-05-17 2005-11-23 Beru AG Glow plug with pressure sensor
    WO2006072510A1 (en) * 2004-12-29 2006-07-13 Robert Bosch Gmbh Pencil-type glow plug having an integrated combustion chamber pressure sensor
    US7581520B2 (en) 2004-12-29 2009-09-01 Robert Bosch Gmbh Pencil-type glow plug having an integrated combustion chamber pressure sensor
    WO2006108738A2 (en) * 2005-04-11 2006-10-19 Robert Bosch Gmbh Sheathed-element heater plug with integrated pressure measuring element
    WO2006108738A3 (en) * 2005-04-11 2006-12-14 Bosch Gmbh Robert Sheathed-element heater plug with integrated pressure measuring element
    WO2006111439A1 (en) * 2005-04-18 2006-10-26 Robert Bosch Gmbh Sheathed element glow plug with a combustion chamber pressure sensor and sealing element
    WO2007073959A1 (en) * 2005-12-23 2007-07-05 Robert Bosch Gmbh Pencil-type glow plug
    US8250909B2 (en) 2006-02-21 2012-08-28 Robert Bosch Gmbh Pressure measuring device
    EP1989485B1 (en) * 2006-02-21 2015-03-18 Robert Bosch GmbH Pressure measuring device
    CN102539065A (en) * 2010-10-20 2012-07-04 森萨塔科技公司 A pressure-measuring plug for a combustion engine
    CN102539065B (en) * 2010-10-20 2015-10-28 森萨塔科技公司 For the pressure-measuring plug of internal combustion engine
    FR2993959A1 (en) * 2012-07-26 2014-01-31 Peugeot Citroen Automobiles Sa Preheating plug for internal combustion engine i.e. diesel engine, has pin mounted inside tubular external body, and external crown provided with half-shells, where part of pin is projected out of body at end of body

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    JP2005090954A (en) 2005-04-07
    US20050061063A1 (en) 2005-03-24
    EP1517086B1 (en) 2012-11-14
    KR101150851B1 (en) 2012-06-13
    US7337657B2 (en) 2008-03-04
    DE10343521A1 (en) 2005-04-21
    KR20050028877A (en) 2005-03-23
    JP4737589B2 (en) 2011-08-03

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