EP1517086A1 - Glow pLug with a pressure sensor for a diesel engine - Google Patents
Glow pLug with a pressure sensor for a diesel engine Download PDFInfo
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 238000002485 combustion reaction Methods 0.000 claims abstract description 27
- 239000012528 membrane Substances 0.000 claims abstract description 11
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000012549 training Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002996 emotional effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
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.
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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)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
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
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
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
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
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
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-
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
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
Ein O-Ring 5 ist am anschlussseitigen Ende als Dichtelement
zwischen dem Innenpol 1.2 und dem Kontaktrohr 6 vorgesehen.An O-
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
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
Über die Auswertung des Signals der Sensoranordnung 9 sind
dann Rückschlüsse auf den jeweiligen Zylinderdruck möglich.About the evaluation of the signal of the
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
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
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
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
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
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
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
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
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
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
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
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
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
Claims (10)
dadurch gekennzeichnet, dass
characterized in that
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10343521A DE10343521A1 (en) | 2003-09-19 | 2003-09-19 | Pressure measuring glow plug for a diesel engine |
DE10343521 | 2003-09-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1517086A1 true EP1517086A1 (en) | 2005-03-23 |
EP1517086B1 EP1517086B1 (en) | 2012-11-14 |
Family
ID=34177850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04020923A Active EP1517086B1 (en) | 2003-09-19 | 2004-09-02 | Glow Plug with a pressure sensor for a diesel engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US7337657B2 (en) |
EP (1) | EP1517086B1 (en) |
JP (1) | JP4737589B2 (en) |
KR (1) | KR101150851B1 (en) |
DE (1) | DE10343521A1 (en) |
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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 |
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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 |
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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 |
Also Published As
Publication number | Publication date |
---|---|
KR101150851B1 (en) | 2012-06-13 |
JP2005090954A (en) | 2005-04-07 |
US7337657B2 (en) | 2008-03-04 |
JP4737589B2 (en) | 2011-08-03 |
DE10343521A1 (en) | 2005-04-21 |
US20050061063A1 (en) | 2005-03-24 |
KR20050028877A (en) | 2005-03-23 |
EP1517086B1 (en) | 2012-11-14 |
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