WO2006029923A1 - Glow plug comprising a combustion chamber pressure sensor - Google Patents

Glow plug comprising a combustion chamber pressure sensor Download PDF

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Publication number
WO2006029923A1
WO2006029923A1 PCT/EP2005/053433 EP2005053433W WO2006029923A1 WO 2006029923 A1 WO2006029923 A1 WO 2006029923A1 EP 2005053433 W EP2005053433 W EP 2005053433W WO 2006029923 A1 WO2006029923 A1 WO 2006029923A1
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WO
WIPO (PCT)
Prior art keywords
glow plug
heating element
combustion chamber
plug according
channel
Prior art date
Application number
PCT/EP2005/053433
Other languages
German (de)
French (fr)
Inventor
Oliver Glock
Christoph Kern
Steffen Schott
Jan Bahlo
Pavlo Saltikov
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to JP2007531728A priority Critical patent/JP4314303B2/en
Priority to US11/662,581 priority patent/US20080296281A1/en
Priority to EP05766798A priority patent/EP1794501A1/en
Publication of WO2006029923A1 publication Critical patent/WO2006029923A1/en

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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
    • 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
    • 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
    • F02P19/025—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 with means for determining glow plug temperature or glow plug resistance
    • 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 glow plug for a fuel engine, consisting essentially of a plug housing and a glow plug arranged in the plug housing, as well as a channel for measuring the combustion chamber pressure.
  • Diesel engines require a heat source for good start-up and warm-up behavior at low temperatures, which preheat either the gas mixture, the intake air or the combustion chamber.
  • glow plugs are usually proposed. These consist of a candle housing and a protruding from the candle housing Glow pin that protrudes in the assembled state of the glow plug from the cylinder head into the combustion chamber of a fuel engine. In general, the glow plugs of the glow plugs protrude by 4 mm into the combustion chamber of the fuel engine and heat the diesel-air mixture. The reached
  • Annealing temperature and afterglow of the glow plug have a significant impact on the exhaust emissions and fuel consumption of the fuel engine.
  • the glow plugs can be metallic heating tubes or ceramic glow plugs.
  • Sensor-integrated concepts in which a pressure sensor is arranged on or in the glow plug, have the advantage that no additional borehole has to be provided in the fuel-fired engine. This advantage increases all the more more, since in modern fuel engines, the space for attaching additional sensors is very limited.
  • the combustion chamber pressure is forwarded by means of an air column to the engine chamber side arranged combustion chamber pressure sensor.
  • Transfer principle of the combustion chamber pressure based on a gas column can be sensitive to coking, as penetrating and accumulating particles can affect the measurement.
  • the channel with at least one heating element is heated, whereby a coking of the channel during operation of the glow plug avoided or lowered to a tolerable level and thus the function of the combustion chamber pressure sensor is secured.
  • a production-technically favorable solution can be achieved by the representation of the channel via a profiled socket.
  • the bush is composed of an inner ring and an outer ring. This offers the advantage that in the transition region of the rings in manufacturing technology favorable manner, the heating element can be inserted.
  • the channel can have a catalytic coating, whereby the burnup temperature of the coking is reduced and thereby the durability of the glow plug is increased with the combustion chamber pressure sensor.
  • the heating element is operated with a map control, which leads to an additional energy savings.
  • thermosensor it is advantageous to monitor the temperature of the heating element by a temperature sensor or by detecting the electrical resistance of the heating element. This will ensure that the temperature in the channel permanently or in phases above the combustion temperature of the soot. This adjustment of the temperature takes place via the interaction of temperature sensor and heater.
  • the socket contains a temperature sensor and at the same time is close to the combustion chamber, it is also possible to detect the temperature in the combustion chamber. This allows additional conclusions about the course of the combustion and can thus be used for the emission improvement.
  • the heating of the socket also causes a heat transfer to the housing of the glow plug, so that deposits between the glow plug and the cylinder head are avoided. This caking of the glow plug is avoided in the cylinder head and facilitates a possible disassembly of the glow plug during maintenance.
  • Figure 1 shows a schematic view of the glow plug according to the invention
  • Figure 2 is a partial view of the housing of this glow plug in section
  • Figure 3 is a partial view of a socket this glow plug
  • Figure 4 shows a cross section through the socket and the housing of the glow plug
  • Figure 5 an inner ring of the socket with sintered heater. Description of the embodiment
  • FIG. 1 shows a schematic illustration of a glow plug 11 which is only partially implemented, with a housing 13, a glow plug 17 and a combustion chamber pressure sensor 19 in section.
  • the glow plug 11 is inserted by means of an external thread 12 of a tubular housing 13 made of metal in a cylinder head 14 of an internal combustion engine, in particular a diesel engine shown only partially.
  • the cylinder head 14 defines a combustion chamber 16 of the internal combustion engine.
  • a glow plug 17 of the glow plug 11 In the combustion chamber 16 partially extends a glow plug 17 of the glow plug 11, which is fixed in the housing 13 with a sleeve 18 shown in FIG.
  • Behind the side facing away from the combustion chamber 16 of the bush 18, a combustion chamber pressure sensor 19 is arranged in the housing 13.
  • the combustion chamber pressure sensor 19 is connected via a channel 21, as shown in Figures 3, 4, with the combustion chamber 16, so that during operation of the internal combustion engine gases of the combustion chamber 16 can act on the combustion chamber pressure sensor 19.
  • the channel 21 extends approximately parallel to the glow plug 17 on an inner wall of the housing 13, so that the risk of deposits in the channel 21 is kept small from the outset.
  • the inner wall 24 of the housing 13 could also have a corresponding profiling and the bush 18 could be cylindrical and smooth on the outside, which, depending on the production facilities, could lead to cost advantages.
  • a heating element 26 with which a burn-off temperature of at least 500 0 C in the channel 21 can be produced.
  • the heating element 26 is sintered in the bush 18.
  • the bushing 18 according to FIG. 4 has an inner ring 27 and an outer ring 28 carrying the profiling.
  • the heating element 26 which is preferably formed as a Schuffleander 29 according to Figure 5, embedded and optionally, in an electrically conductive material of the sleeve 18, with respect to the two rings 27, 28 electrically insulated. Due to the design of the heating element 26 as Bankffleander 29 reaches a largely homogeneous heat radiation of the heating element 26th Alternatively, the heating meander 29 could also be laminated in thick film technology between two films. This shows a production alternative that can lead to cost advantages.
  • this may have a catalytic coating 31.
  • the heating element 26 can be operated permanently or cyclically. These two modes of operation can be static at a fixed temperature or dynamically after timed heating cycles. Thus, an adaptation to the mode of operation of a control device for the internal combustion engine is possible.
  • the heating element 26 could also be operated with a map control, so that, for example, the engine temperature or the current operating point of the internal combustion engine for the heating of the channel 21 can be taken into account.
  • Outer ring 28 of the sleeve 18 is sintered, are monitored.
  • this monitoring could also be done by controlling the electrical resistance of the heating element 26.
  • the heating element 26 is operated with pulsed current and the temperature measurement for monitoring the electrical resistance of the heating element 26 in the intervals between the heating phases, so that the temperature measurement is decoupled from the operation of the heating element 26 and accurate.
  • the pressure measurement of the combustion chamber pressure can be performed system-accurate, since the cross-sectional area of the channel 21 can not be clogged and thus remains constant.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Measuring Fluid Pressure (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

The invention relates to a glow plug (11) comprising a combustion chamber pressure sensor (19) for an internal combustion engine. Said plug essentially consists of a housing (13), a glow element (17) that is located in the housing (13) and a channel (21) for measuring the combustion chamber pressure. An inventive heating element, (26) which is connected to the channel (21), prevents the clogging of the combustion chamber pressure sensor (19) that is located at the end of the channel (26) by coking or combustion residues. The glow plug (11) comprising a combustion chamber pressure sensor (19) is preferably used in the automobile industry.

Description

Glühkerze mit BrennraumdrucksensorGlow plug with combustion chamber pressure sensor
Die Erfindung bezieht sich auf eine Glühkerze für eine Brennstoffkraftmaschine, bestehend im wesentlichen aus einem Kerzengehäuse und einem in dem Kerzengehäuse angeordneten Glühstift, sowie mit einem Kanal zur Messung des Brennraumdrucks.The invention relates to a glow plug for a fuel engine, consisting essentially of a plug housing and a glow plug arranged in the plug housing, as well as a channel for measuring the combustion chamber pressure.
Stand der TechnikState of the art
Dieselmotoren benötigen für ein gutes Start- und Warmlaufverhalten bei tiefen Temperaturen eine Wärmequelle, die entweder das Gasgemisch, die Ansaugluft oder den Brennraum vorwärmen. Für PKW-Motoren wird in der Regel die Verwendung von Glühkerzen vorgeschlagen. Diese bestehen aus einem Kerzengehäuse und einem aus dem Kerzengehäuse ragenden Glühstift, der im montierten Zustand der Glühkerze aus dem Zylinderkopf in den Brennraum einer Brennstoffkraftmaschine hineinragt. In der Regel ragen die Glühstifte der Glühkerzen um 4 mm in den Brennraum der Brennstoffkraftmaschine hinein und erwärmen das Diesel-Luft-Gemisch. Die erreichteDiesel engines require a heat source for good start-up and warm-up behavior at low temperatures, which preheat either the gas mixture, the intake air or the combustion chamber. For automotive engines, the use of glow plugs is usually proposed. These consist of a candle housing and a protruding from the candle housing Glow pin that protrudes in the assembled state of the glow plug from the cylinder head into the combustion chamber of a fuel engine. In general, the glow plugs of the glow plugs protrude by 4 mm into the combustion chamber of the fuel engine and heat the diesel-air mixture. The reached
Glühtemperatur und Nachglühzeit der Glühkerze haben dabei einen erheblichen Einfluss auf das Abgasverhalten und den Kraftstoffverbrauch der Brennstoffkraftmaschine.Annealing temperature and afterglow of the glow plug have a significant impact on the exhaust emissions and fuel consumption of the fuel engine.
Bei den Glühstiften kann es sich um metallische Heizrohre oder um keramische Glühstifte handeln.The glow plugs can be metallic heating tubes or ceramic glow plugs.
Um die vorgegebenen Ziele, weiter Kraftstoff einzusparen und Emissionen zu senken, zu erreichen, besteht ein zunehmendes Interesse darin, funktionssichere Sensoren zu entwickeln, die Informationen über den Verbrennungsablauf, insbesondere den dabei auftretenden Druckverlauf, direkt aus dem Brennraum des Motors liefern können. Die Verfolgung des Druckes innerhalb des Brennraums hätte wesentliche Vorteile beispielsweise gegenüber einer Ionenstrommessung, die lediglich eine lokale Information liefert, da die Druckmesswerte bzw. deren Änderungen größer und daher einfacher erfassbar sind. Aus diesen Informationen könnte z.B. die Einspritzmengenregelung vorgenommen werden.In order to achieve the stated goals of further saving fuel and reducing emissions, there is an increasing interest in developing functionally reliable sensors that can provide information about the combustion process, in particular the pressure curve occurring directly from the combustion chamber of the engine. The tracking of the pressure within the combustion chamber would have significant advantages, for example compared to an ion current measurement, which provides only local information, since the pressure readings or their changes are larger and therefore easier to detect. From this information, e.g. the injection quantity control can be made.
Sensorintegrative Konzepte, bei denen ein Drucksensor an oder in der Glühkerze angeordnet sind, haben den Vorteil, dass kein zusätzliches Bohrloch in der Brennstoffkraftmaschine vorgesehen sein muss. Dieser Vorteil vergrößert sich um so mehr, da bei modernen Brennstoffkraftmaschinen der Bauraum zum Anbringen von zusätzlichen Sensoren sehr eingeschränkt ist.Sensor-integrated concepts, in which a pressure sensor is arranged on or in the glow plug, have the advantage that no additional borehole has to be provided in the fuel-fired engine. This advantage increases all the more more, since in modern fuel engines, the space for attaching additional sensors is very limited.
Aus dem Stand der Technik, beispielsweise der DE 41 32 842 Al, wird eine Lösung vorgeschlagen, bei der als Sensorelement ein Quarzkristall-Druckaufnehmer verwendet wird.From the prior art, for example DE 41 32 842 A1, a solution is proposed in which a quartz crystal pressure transducer is used as the sensor element.
Die Druckübertragung zwischen dem Brennraum und dem Sensorelement erfolgt über einen Kanal, der längsgerichtet durch das gesamte Gehäuse der Glühkerze verläuft. In diesemThe pressure transmission between the combustion chamber and the sensor element via a channel which extends longitudinally through the entire housing of the glow plug. In this
Kanal wird der Brennraumdruck mittels einer Luftsäule bis zum motorraumseitig angeordneten Brennraumdrucksensor weitergeleitet.Channel, the combustion chamber pressure is forwarded by means of an air column to the engine chamber side arranged combustion chamber pressure sensor.
Glühkerzen mit integriertem Drucksensor, die auf demGlow plugs with integrated pressure sensor mounted on the
Übertragungsprinzip des Brennraumdrucks mittels einer Gassäule beruhen, können empfindlich gegenüber Verkokung sein, da eindringende und sich ansammelnde Partikel die Messung beeinflussen können.Transfer principle of the combustion chamber pressure based on a gas column can be sensitive to coking, as penetrating and accumulating particles can affect the measurement.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Glühkerze mit Brennraumdrucksensor mit dem kennzeichnenden Merkmal des Hauptanspruchs hat demgegenüber den Vorteil, dass die zuvor erwähnteThe glow plug with combustion chamber pressure sensor according to the invention with the characterizing feature of the main claim has the advantage that the aforementioned
Unzulänglichkeit in zufriedenstellendem Maße vermieden wird.Inadequacy is avoided to a satisfactory extent.
Dazu ist der Kanal mit wenigstens einem Heizelement beheizbar, wodurch eine Verkokung des Kanals beim Betrieb der Glühkerze vermieden oder auf ein erträgliches Maß abgesenkt wird und dadurch die Funktion des Brennraumdrucksensors gesichert wird.For this purpose, the channel with at least one heating element is heated, whereby a coking of the channel during operation of the glow plug avoided or lowered to a tolerable level and thus the function of the combustion chamber pressure sensor is secured.
Durch die in den ünteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Glühkerze möglich.The measures listed in the dependent claims advantageous refinements and improvements of the main claim glow plug are possible.
Gemäß vorteilhafter Ausgestaltung kann durch die Darstellung des Kanals über eine profilierte Buchse eine fertigungstechnisch günstige Lösung erzielt werden.According to an advantageous embodiment, a production-technically favorable solution can be achieved by the representation of the channel via a profiled socket.
Weiterhin vorteilhaft ist, dass die Buchse aus einem Innenring und einem Außenring zusammengesetzt ist. Dies bietet den Vorteil, dass in dem Übergangsbereich der Ringe in fertigungstechnisch günstiger Weise das Heizelement eingefügt werden kann.It is also advantageous that the bush is composed of an inner ring and an outer ring. This offers the advantage that in the transition region of the rings in manufacturing technology favorable manner, the heating element can be inserted.
Auch vorteilhaft ist, dass der Kanal eine katalytische Beschichtung aufweisen kann, wodurch die Abbrandtemperatur der Verkokungen erniedrigt wird und dadurch die Dauerhaltbarkeit der Glühkerze mit dem Brennraumdrucksensor gesteigert wird.It is also advantageous that the channel can have a catalytic coating, whereby the burnup temperature of the coking is reduced and thereby the durability of the glow plug is increased with the combustion chamber pressure sensor.
Ferner ist vorteilhaft, dass das Heizelement mit einer Kennfeldregelung betrieben wird, die zu einer zusätzlichen Energieersparnis führt.Furthermore, it is advantageous that the heating element is operated with a map control, which leads to an additional energy savings.
Schließlich ist vorteilhaft, die Temperatur des Heizelements durch einen Temperaturfühler oder durch die Erfassung des elektrischen Widerstandes des Heizelements zu überwachen. Dadurch wird sichergestellt, dass die Temperatur in dem Kanal dauerhaft oder phasenweise über der Abbrandtemperatur des Rußes liegt. Diese Einregelung der Temperatur erfolgt über das Zusammenwirken von Temperaturfühler und Heizung.Finally, it is advantageous to monitor the temperature of the heating element by a temperature sensor or by detecting the electrical resistance of the heating element. This will ensure that the temperature in the channel permanently or in phases above the combustion temperature of the soot. This adjustment of the temperature takes place via the interaction of temperature sensor and heater.
Da die Buchse einen Temperaturfühler enthält und zugleich nah am Brennraum liegt, ist es möglich, auch die Temperatur im Brennraum mit zu erfassen. Dies erlaubt zusätzliche Rückschlüsse auf den Verlauf der Verbrennung und kann somit für die Emissionsverbesserung verwendet werden.Since the socket contains a temperature sensor and at the same time is close to the combustion chamber, it is also possible to detect the temperature in the combustion chamber. This allows additional conclusions about the course of the combustion and can thus be used for the emission improvement.
Durch die Aufheizung der Buchse erfolgt auch eine Wärmeübertragung auf das Gehäuse der Glühkerze, so dass Ablagerungen zwischen Glühkerze und Zylinderkopf vermieden werden. Damit wird ein Festbacken der Glühkerze in dem Zylinderkopf vermieden und eine mögliche Demontage der Glühkerze bei Wartungsarbeiten erleichtert.The heating of the socket also causes a heat transfer to the housing of the glow plug, so that deposits between the glow plug and the cylinder head are avoided. This caking of the glow plug is avoided in the cylinder head and facilitates a possible disassembly of the glow plug during maintenance.
Weitere vorteilhafte Ausgestaltungen gehen aus der nachfolgenden Beschreibung sowie den Ansprüchen hervor.Further advantageous embodiments will become apparent from the following description and the claims.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der Figurenbeschreibung näher erläutert. Figur 1 zeigt eine schematische Ansicht der erfindungsgemäßen Glühkerze, Figur 2 eine Teilansicht des Gehäuses dieser Glühkerze im Schnitt, Figur 3 eine Teilansicht einer Buchse dieser Glühkerze, Figur 4 einen Querschnitt durch die Buchse und das Gehäuse der Glühkerze und Figur 5 einen Innenring der Buchse mit eingesintertem Heizer. Beschreibung des AusführungsbeispielsAn embodiment of the invention is illustrated in the drawing and explained in more detail in the description of the figures. Figure 1 shows a schematic view of the glow plug according to the invention, Figure 2 is a partial view of the housing of this glow plug in section, Figure 3 is a partial view of a socket this glow plug, Figure 4 shows a cross section through the socket and the housing of the glow plug and Figure 5 an inner ring of the socket with sintered heater. Description of the embodiment
In Figur 1 ist eine schematische Darstellung einer nur ansatzweise ausgeführten Glühkerze 11 mit einem Gehäuse 13, einem Glühstift 17 und einem Brennraumdrucksensor 19 im Schnitt gezeigt.FIG. 1 shows a schematic illustration of a glow plug 11 which is only partially implemented, with a housing 13, a glow plug 17 and a combustion chamber pressure sensor 19 in section.
Die Glühkerze 11 ist mittels eines Außengewindes 12 eines rohrförmigen Gehäuses 13 aus Metall in einen nur ansatzweise gezeigten Zylinderkopf 14 einer Brennkraftmaschine, insbesondere eines Dieselmotors, eingesetzt. Der Zylinderkopf 14 begrenzt einen Brennraum 16 der Brennkraftmaschine. In den Brennraum 16 ragt partiell ein Glühstift 17 der Glühkerze 11, der in dem Gehäuse 13 mit einer in der Figur 3 dargestellten Buchse 18 befestigt ist. Hinter der dem Brennraum 16 abgewandten Seite der Buchse 18 ist in dem Gehäuse 13 ein Brennraumdrucksensor 19 angeordnet. Der Brennraumdrucksensor 19 ist über einen Kanal 21, wie er in den Figuren 3, 4 dargestellt ist, mit dem Brennraum 16 verbunden, so dass beim Betrieb der Brennkraftmaschine Gase des Brennraums 16 den Brennraumdrucksensor 19 beaufschlagen können. Der Kanal 21 verläuft annähernd parallel zum Glühstift 17 an einer Innenwand des Gehäuses 13, so dass die Gefahr von Ablagerungen in dem Kanal 21 von vornherein klein gehalten wird.The glow plug 11 is inserted by means of an external thread 12 of a tubular housing 13 made of metal in a cylinder head 14 of an internal combustion engine, in particular a diesel engine shown only partially. The cylinder head 14 defines a combustion chamber 16 of the internal combustion engine. In the combustion chamber 16 partially extends a glow plug 17 of the glow plug 11, which is fixed in the housing 13 with a sleeve 18 shown in FIG. Behind the side facing away from the combustion chamber 16 of the bush 18, a combustion chamber pressure sensor 19 is arranged in the housing 13. The combustion chamber pressure sensor 19 is connected via a channel 21, as shown in Figures 3, 4, with the combustion chamber 16, so that during operation of the internal combustion engine gases of the combustion chamber 16 can act on the combustion chamber pressure sensor 19. The channel 21 extends approximately parallel to the glow plug 17 on an inner wall of the housing 13, so that the risk of deposits in the channel 21 is kept small from the outset.
Die in der Figur 3 dargestellte Buchse 18, die aus keramischen Werkstoffen gefertigt ist, jedoch alternativ auch als ein Metallteil ausgeführt sein kann, weist außenseitig über ihre gesamte Länge eine Profilierung in Form von Sicken 22 auf, die parallel zu einer Längsachse 23 der Glühkerze 11 verlaufen. Die durch die Sicken 22 gegenüber einer glattwandigen Innenwand 24 des Gehäuses 13 gebildeten freien Querschnitte bilden in der Summe den Kanal 21.The sleeve 18 shown in FIG. 3, which is made of ceramic materials but may alternatively be embodied as a metal part, has its outer side entire length profiling in the form of beads 22 which extend parallel to a longitudinal axis 23 of the glow plug 11. The free cross sections formed by the beads 22 with respect to a smooth-walled inner wall 24 of the housing 13 in the sum form the channel 21st
Alternativ könnte auch die Innenwand 24 des Gehäuses 13 eine entsprechende Profilierung aufweisen und die Buchse 18 außenseitig zylindrisch und glatt ausgeführt sein, was, abhängig von den Fertigungseinrichtungen, zu Kostenvorteilen führen kann.Alternatively, the inner wall 24 of the housing 13 could also have a corresponding profiling and the bush 18 could be cylindrical and smooth on the outside, which, depending on the production facilities, could lead to cost advantages.
Um eine Verkokung des Kanals 21 beim Betrieb der Brennkraftmaschine zu verhindern, weist die Buchse 18, wie in der Figur 4 dargestellt, ein Heizelement 26 auf, mit dem eine Abbrandtemperatur von mindestens 500 0C in dem Kanal 21 hergestellt werden kann.In order to prevent coking of the channel 21 during operation of the internal combustion engine, the sleeve 18, as shown in Figure 4, a heating element 26, with which a burn-off temperature of at least 500 0 C in the channel 21 can be produced.
Zum Schutz des Heizelements 26 vor den aggressiven Gasen aus dem Brennraum 16 ist das Heizelement 26, wie in der Figur 5 separat dargestellt ist, in der Buchse 18 eingesintert. Dazu weist die Buchse 18 entsprechend Figur 4 einen Innenring 27 und einen die Profilierung tragenden Außenring 28 auf. Zwischen diesen beiden Ringen 27, 28 wird das Heizelement 26, das vorzugsweise als ein Heizmäander 29 entsprechend Figur 5 ausgebildet ist, eingebettet und gegebenenfalls, bei einem elektrisch leitenden Werkstoff der Buchse 18, gegenüber den beiden Ringen 27, 28 elektrisch isoliert. Durch die Ausbildung des Heizelements 26 als Heizmäander 29 erreicht man eine weitgehend homogene Wärmeabstrahlung des Heizelements 26. Alternativ könnte der Heizmäander 29 in Dickschichttechnik auch zwischen zwei Folien einlaminiert sein. Damit ist eine Fertigungsalternative aufgezeigt, die zu Kostenvorteilen führen kann.To protect the heating element 26 from the aggressive gases from the combustion chamber 16, the heating element 26, as shown separately in FIG. 5, is sintered in the bush 18. For this purpose, the bushing 18 according to FIG. 4 has an inner ring 27 and an outer ring 28 carrying the profiling. Between these two rings 27, 28, the heating element 26, which is preferably formed as a Heizmäander 29 according to Figure 5, embedded and optionally, in an electrically conductive material of the sleeve 18, with respect to the two rings 27, 28 electrically insulated. Due to the design of the heating element 26 as Heizmäander 29 reaches a largely homogeneous heat radiation of the heating element 26th Alternatively, the heating meander 29 could also be laminated in thick film technology between two films. This shows a production alternative that can lead to cost advantages.
um die Abbrandtemperatur für Verkokungen in dem Kanal 21 zu erniedrigen, kann dieser eine katalytische Beschichtungi 31 aufweisen.In order to lower the combustion temperature for coking in the channel 21, this may have a catalytic coating 31.
Grundsätzlich kann das Heizelement 26 permanent oder zyklisch betrieben werden. Diese beiden Betriebsarten können statisch bei einer festgelegten Temperatur oder dynamisch nach zeitlich festgelegten Heizzyklen erfolgen. Somit ist eine Anpassung an die Betriebsweise eines Steuergeräts für die Brennkraftmaschine möglich.In principle, the heating element 26 can be operated permanently or cyclically. These two modes of operation can be static at a fixed temperature or dynamically after timed heating cycles. Thus, an adaptation to the mode of operation of a control device for the internal combustion engine is possible.
Alternativ könnte das Heizelement 26 auch mit einer Kennfeldregelung betrieben werden, so dass beispielsweise die Motortemperatur oder der aktuelle Betriebspunkt der Brennkraftmaschine für die Heizung des Kanals 21 berücksichtigt werden kann.Alternatively, the heating element 26 could also be operated with a map control, so that, for example, the engine temperature or the current operating point of the internal combustion engine for the heating of the channel 21 can be taken into account.
Ferner kann die Temperatur des Heizelements 26 durch einen in der Figur 4 dargestellten Temperaturfühler 32, der in denFurther, the temperature of the heating element 26 by a temperature sensor 32 shown in the figure 4, which in the
Außenring 28 der Buchse 18 eingesintert ist, überwacht werden.Outer ring 28 of the sleeve 18 is sintered, are monitored.
Alternativ könnte diese Überwachung auch durch eine Kontrolle des elektrischen Widerstandes des Heizelements 26 erfolgen. Dabei wird das Heizelement 26 mit getaktetem Strom betrieben und die Temperaturmessung zur Überwachung des elektrischen Widerstandes des Heizelements 26 in den Pausen zwischen den Heizphasen vorgenommen, so dass die Temperaturmessung von dem Betrieb des Heizelements 26 abgekoppelt und genau ist.Alternatively, this monitoring could also be done by controlling the electrical resistance of the heating element 26. In this case, the heating element 26 is operated with pulsed current and the temperature measurement for monitoring the electrical resistance of the heating element 26 in the intervals between the heating phases, so that the temperature measurement is decoupled from the operation of the heating element 26 and accurate.
Durch die Beheizung des Kanals 21 kann die Druckmessung des Brennraumdrucks systemgenau durchgeführt werden, da die Querschnittsfläche des Kanals 21 sich nicht zusetzen kann und somit konstant bleibt. Durch die Unterbindung einer Partikelablagerung auf der empfindlichen Membran desBy heating the channel 21, the pressure measurement of the combustion chamber pressure can be performed system-accurate, since the cross-sectional area of the channel 21 can not be clogged and thus remains constant. By inhibiting particle deposition on the sensitive membrane of the
Brennraumducksensors 19 kann dessen Funktion langzeitstabil gesichert werden. Brennraumducksensors 19 whose function can be secured long-term stable.

Claims

Glühkerze mit BrennraumdrucksensorA N S P R Ü C H E Glow plug with combustion chamber pressure sensorA NSPR Ü CHE
1. Glühkerze mit Brennraumdrucksensor, welche Glühkerze (11) ein Gehäuse (13) und einen in dem Gehäuse (13) angeordneten1. glow plug with combustion chamber pressure sensor, which glow plug (11) a housing (13) and arranged in the housing (13)
Glühstift (17) aufweist und wenigstens einen zu dem Brennraumdrucksensor (19) führenden Kanal (21) zur Messung des Brennraumdrucks enthält, dadurch gekennzeichnet;, dass der Kanal (21) mit mindestens einem Heizelement (26) beheizbar ist.Glow pin (17) and at least one of the combustion chamber pressure sensor (19) leading channel (21) for measuring the combustion chamber pressure, characterized in that the channel (21) with at least one heating element (26) is heated.
2. Glühkerze nach Anspruch 1, dadurch gekennzeichnet, dass der Kanal (21) annähernd parallel zum Glühstift (17) an einer Innenwand (24) des Gehäuses (13) verläuft.2. Glow plug according to claim 1, characterized in that the channel (21) extends approximately parallel to the glow plug (17) on an inner wall (24) of the housing (13).
3. Glühkerze nach Anspruch 2, dadurch gekennzeichnet, dass der Kanal (21) durch eine Profilierung einer Buchse (18) , die an der Innenwand (24) des Gehäuses (13) anliegt, dargestellt ist. 3. glow plug according to claim 2, characterized in that the channel (21) by a profiling of a bushing (18) which bears against the inner wall (24) of the housing (13) is shown.
4. Glühkerze nach Anspruch 2, dadurch gekennzeichnet, dass der Kanal (21) durch eine glattwandige Buchse (18) , die an einer Profilierung der Innenwand (24) anliegt, dargestellt ist.4. glow plug according to claim 2, characterized in that the channel (21) by a smooth-walled bushing (18) which bears against a profiling of the inner wall (24) is shown.
5. Glühkerze nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Buchse (18) einen Innenring (27) und einen Außenring (28) aufweist, wobei zwischen diesen Ringen (27, 28) das Heizelement (26) eingebettet ist.5. Glow plug according to one of the preceding claims, characterized in that the bush (18) has an inner ring (27) and an outer ring (28), wherein between these rings (27, 28), the heating element (26) is embedded.
6. Glühkerze nach Anspruch 5, dadurch gekennzeichnet, dass das6. Glow plug according to claim 5, characterized in that the
Heizelement (26) als ein gegenüber den Ringen (27, 28) elektrisch isolierter Heizmäander (29) ausgebildet ist.Heating element (26) as a relative to the rings (27, 28) electrically insulated Heizmäander (29) is formed.
7. Glühkerze nach Anspruch 6, dadurch gekennzeichnet, dass der Heizmäander (29) in Dickschichttechnik zwischen zwei Folien einlaminiert ist.7. Glow plug according to claim 6, characterized in that the Heizmäander (29) is laminated in thick film technology between two films.
8. Glühkerze nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Kanal (21) eine katalytische Beschichtung (31) aufweist.8. Glow plug according to one of the preceding claims, characterized in that the channel (21) has a catalytic coating (31).
9. Glühkerze nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Heizelement (26) permanent oder zyklisch betrieben wird.9. Glow plug according to one of the preceding claims, characterized in that the heating element (26) is operated permanently or cyclically.
10. Glühkerze nach Anspruch 9, dadurch gekennzeichnet, dass die beiden Betriebsarten des Heizelements (26) statisch bei einer festgelegten Temperatur oder dynamisch nach zeitlich festgelegten Heizzyklen erfolgt. 10. A glow plug according to claim 9, characterized in that the two modes of operation of the heating element (26) takes place statically at a predetermined temperature or dynamically after timed heating cycles.
11. Glühkerze nach Anspruch 9, dadurch gekennzeichnet, dass das Heizelement (26) mit einer Kennfeldregelung betrieben wird.11. A glow plug according to claim 9, characterized in that the heating element (26) is operated with a map control.
12. Glühkerze nach Anspruch 9, dadurch gekennzeichnet, dass die Temperatur des Heizelements (26) durch einen Temperaturfühler (32) oder durch eine Überwachung des elektrischen Widerstandes des Heizelements (26) überwacht wird.12. A glow plug according to claim 9, characterized in that the temperature of the heating element (26) by a temperature sensor (32) or by monitoring the electrical resistance of the heating element (26) is monitored.
13. Glühkerze nach Anspruch 10, dadurch gekennzeichnet, dass bei der Überwachung des elektrischen Widerstandes des Heizelements (26) dieses mit getaktetem Strom betrieben wird und die Temperaturmessung zur Überwachung des elektrischen Widerstandes des Heizelements (26) in den Pausen zwischen den Heizphasen erfolgt. 13. A glow plug according to claim 10, characterized in that in the monitoring of the electrical resistance of the heating element (26) this is operated with clocked current and the temperature measurement for monitoring the electrical resistance of the heating element (26) takes place in the breaks between the heating phases.
PCT/EP2005/053433 2004-09-18 2005-07-18 Glow plug comprising a combustion chamber pressure sensor WO2006029923A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2007531728A JP4314303B2 (en) 2004-09-18 2005-07-18 Glow plug with combustion chamber pressure sensor
US11/662,581 US20080296281A1 (en) 2004-09-18 2005-07-18 Glow Plug Containing a Combustion Chamber Pressure Sensor
EP05766798A EP1794501A1 (en) 2004-09-18 2005-07-18 Glow plug comprising a combustion chamber pressure sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004045383.7 2004-09-18
DE102004045383A DE102004045383A1 (en) 2004-09-18 2004-09-18 Glow plug with combustion chamber pressure sensor

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US (1) US20080296281A1 (en)
EP (1) EP1794501A1 (en)
JP (1) JP4314303B2 (en)
DE (1) DE102004045383A1 (en)
WO (1) WO2006029923A1 (en)

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DE102007044967A1 (en) * 2007-09-19 2009-04-02 Beru Ag Glow plug with coking-optimized design, special annular gap formation
DE102010011044B4 (en) * 2010-03-11 2012-12-27 Borgwarner Beru Systems Gmbh Method for controlling a glow plug
DE102013020998A1 (en) 2013-12-12 2014-07-31 Daimler Ag Pressure sensor for detecting pressure in combustion chamber of internal combustion engine of motor vehicle, has seal element for sealing of transfer element against housing portion, which is partly provided with catalytic coating
JP5964877B2 (en) * 2014-03-25 2016-08-03 トヨタ自動車株式会社 In-cylinder pressure sensor control device
JP6370100B2 (en) * 2014-05-16 2018-08-08 日本特殊陶業株式会社 Glow plug with combustion pressure detection sensor
US20180112874A1 (en) * 2015-04-21 2018-04-26 Bosch Corporation Glow plug
DE102016226018A1 (en) 2016-12-22 2018-06-28 Robert Bosch Gmbh Glow plug with a combustion chamber pressure sensor for an internal combustion engine
JP6835604B2 (en) * 2017-01-26 2021-02-24 京セラ株式会社 heater
DE102017216121A1 (en) * 2017-09-13 2019-03-14 Volkswagen Aktiengesellschaft Method for operating an internal combustion engine and internal combustion engine
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FR2845463A1 (en) * 2002-10-07 2004-04-09 Denso Corp Engine glow plug sensor comprises cylindrical casing containing tubular element having electrically operated heat generating element connected to central metallic rod with combustion pressure sensor

Also Published As

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US20080296281A1 (en) 2008-12-04
EP1794501A1 (en) 2007-06-13
JP2008513717A (en) 2008-05-01
JP4314303B2 (en) 2009-08-12
DE102004045383A1 (en) 2006-03-23

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