WO2005085788A1 - Device for detecting the combustion chamber pressure in an internal combustion engine - Google Patents

Device for detecting the combustion chamber pressure in an internal combustion engine Download PDF

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Publication number
WO2005085788A1
WO2005085788A1 PCT/EP2005/050125 EP2005050125W WO2005085788A1 WO 2005085788 A1 WO2005085788 A1 WO 2005085788A1 EP 2005050125 W EP2005050125 W EP 2005050125W WO 2005085788 A1 WO2005085788 A1 WO 2005085788A1
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WO
WIPO (PCT)
Prior art keywords
sensor
glow plug
combustion chamber
internal combustion
combustion engine
Prior art date
Application number
PCT/EP2005/050125
Other languages
German (de)
French (fr)
Inventor
Thomas Ludwig
Christoph Kern
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 EP05701508A priority Critical patent/EP1725848A1/en
Priority to US10/591,881 priority patent/US20070240661A1/en
Priority to JP2007501255A priority patent/JP4546997B2/en
Publication of WO2005085788A1 publication Critical patent/WO2005085788A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines

Definitions

  • the invention is based on a device for detecting the combustion chamber pressure in an internal combustion engine.
  • a device for detecting a combustion chamber pressure in a diesel engine is already known from DE 196 80 912 C2, with a pressure sensor and a heating section of a glow plug. This heating section faces an interior of a cylinder of the diesel engine and can be acted upon by the combustion chamber pressure.
  • the heating section is fixed within a housing of the glow plug by a fixing member.
  • the pressure sensor is arranged between this fixing member and the heating section.
  • the glow plug and the pressure sensor are supported by the same fixing member with respect to the housing of the glow plug, so that the pressure sensor is acted on at least approximately by the entire force acting on the glow plug.
  • the device according to the invention with the characterizing features of the main claim has the advantage that the aforementioned shortcomings are avoided to a satisfactory extent.
  • the senor is arranged between the fixing element of the glow plug of the glow plug and a second end of the glow plug. This makes it possible to decouple the sensor from the full force acting on the glow plug and to operate it in its linear and low-hysteresis range.
  • the load range of the sensor can be deliberately limited, so that the signal-technically optimal range of the sensor can be used with regard to a safe and reproducible detection of the combustion chamber pressure in the internal combustion engine.
  • the at least indirect non-positive connection of the sensor with the glow plug is carried out with pretension. This counteracts a hysteresis effect in the acquisition of measured values.
  • the sensor is separated from the glow plug or the fixing element by at least one spacer.
  • the maximum force acting on the sensor can be set via its design and rigidity.
  • the at least one spacer body is designed as an intermediate sleeve, the sensor as a piezo ring and the fixing element as a sleeve.
  • glow and signal lines for the glow plug or the sensor can be passed through in a simplified manner.
  • a device for detecting the combustion chamber pressure in an internal combustion engine contains a glow plug 11, which by means of an external thread 12 of a tubular
  • Housing 13 made of metal is mounted in a cylinder head 14 of the internal combustion engine, only a part of which is shown, in particular a diesel engine.
  • the glow plug 11 has a first end 16
  • Glow plug 17 which partially protrudes from the housing 13 and protrudes with a free end 18 into an interior 19 of the internal combustion engine forming a combustion chamber.
  • the glow plug 17 is fastened in the glow plug 11 by a fixing member 22.
  • This fixing member 22 is designed as a support tube which, in one end region 23 of the other end of the glow plug 17, surrounds it fixedly on the circumference. The fixing member 22 is in turn pressed into the housing 13.
  • the fixing member 22 could also be realized by a graphite sleeve or in the form of a material connection, for example as a welded connection.
  • a sensor 26 is arranged between the fixing member 22 and thus also between the end region 23 of the glow plug 17 and the second end 24 of the glow plug 11.
  • the sensor 26 is spaced from the glow plug 17 in the exemplary embodiment by a spacer 27.
  • the sensor 26 could also bear directly on the glow plug 17.
  • the sensor 26 is supported with the interposition of a spacer 28 on a fixing element 29 for the sensor 24, which is fixedly arranged in the housing 13 and thus defines the position of the sensor 24 in the housing 13.
  • the fixing element 29 is designed, for example, as a sleeve caulked in the housing 13 and, alternatively, could also be in direct contact with the sensor 26.
  • the spacer 27 and the spacer 28 are each in the form of an intermediate sleeve 31, which is preferably made of ceramic or steel.
  • contacting elements which are not detailed, emerge in the form of electrical lines, which serve, for example, on the one hand to supply power to the glow plug 17 and on the other hand to forward the signals emitted by the sensor 26.
  • the compressive force on the glow plug 17 also leads to an elastic deformation of the glow plug 17, which by the sensor 26, which is implemented, for example, by a force or displacement sensor designed as a piezo ring.
  • the signal emitted by the sensor 26 can be correlated with the pressure in the combustion chamber 19 via characteristic curves. In the ideal case, the signal emitted by the sensor 26 is a variable proportional to the pressure in the combustion chamber 19.
  • the sensor 26 can also be operated in a preloaded manner in order to detect the pressure in the combustion chamber 19, for example in order to reduce hysteresis effects.
  • the sensor 26 after the glow plug 17 has been fixed by the fixing member 22 on the housing 13, is subjected to a predetermined force which, even when the internal combustion engine is not in operation, alternatively presses it against the glow plug 17 only indirectly via the intermediate spacer 27.
  • This preload is maintained by the fixing element 29, which is fixedly mounted in the housing 13, or a spacer element 28 fixed to the housing 13.
  • the maximum force on the sensor 26 can be determined by the
  • Fixing element 29 can be set.
  • the separation between the fixing member 22 for the glow plug 17 and the fixing element 29 for the sensor 26 means that the area of the sensor 26 that is optimal in terms of signal technology can be used, so that reliable and reproducible detection of the combustion chamber pressure in the internal combustion engine is possible.

Abstract

The invention relates to a device for detecting the combustion chamber pressure in an internal combustion engine, which is configured in such a way that the combustion chamber pressure can be detected in a reliable, reproducible manner. To achieve this, a sheathed element (17) that is subjected to the combustion chamber pressure is fixed in a housing (13) of a heater plug (11) by means of a fixing member (22). A sensor (26) is fixed in the housing (13) of the heater plug (11) by means of a fixing element (29) that is located at a distance from said fixing member (22). Said sensor (26) detects the elastic deformation of the sheathed element (17) that is caused by the combustion chamber pressure. The inventive device is preferably used in automotive construction.

Description

Vorrichtung zur Erfassung des Brennraumdrucks bei einer BrennkraftmaschineDevice for detecting the combustion chamber pressure in an internal combustion engine
Stand der TechnikState of the art
Die Erfindung geht aus von einer Vorrichtung zur Erfassung des Brennraumdrucks bei einer Brennkraftmaschine . Es ist schon eine Vorrichtung zum Detektieren eines Brennraumdrucks in einem Dieselmotor aus der DE 196 80 912 C2 bekannt, mit einem Drucksensor und einem Heizabschnitt einer Glühkerze. Dieser Heizabschnitt ist einem Innenraum eines Zylinders des Dieselmotors zugewandt und durch den Brennraumdruck beaufschlagbar. Der Heizabschnitt ist innerhalb eines Gehäuses der Glühkerze durch ein Fixierglied befestigt. Zwischen diesem Fixierglied und dem Heizabschnitt ist der Drucksensor angeordnet.The invention is based on a device for detecting the combustion chamber pressure in an internal combustion engine. A device for detecting a combustion chamber pressure in a diesel engine is already known from DE 196 80 912 C2, with a pressure sensor and a heating section of a glow plug. This heating section faces an interior of a cylinder of the diesel engine and can be acted upon by the combustion chamber pressure. The heating section is fixed within a housing of the glow plug by a fixing member. The pressure sensor is arranged between this fixing member and the heating section.
Bei dieser Anordnung ist der Glühstift und der Drucksensor durch das gleiche Fixierglied gegenüber dem Gehäuse der Glühkerze abgestützt, so dass der Drucksensor zumindest annähernd durch die gesamte auf den Glühstift wirkende Kraft beaufschlagt wird. In nachteiliger Weise führt dies bei einigen Sensormaterialien dazu, dass der Drucksensor auch in seinem nichtlinearen Bereich betrieben wird, was zu einem nicht reproduzierbaren Meßsignal und zu einer unsicheren Erfassung des Brennraumdrucks bei der Brennkraftmaschine führ .In this arrangement, the glow plug and the pressure sensor are supported by the same fixing member with respect to the housing of the glow plug, so that the pressure sensor is acted on at least approximately by the entire force acting on the glow plug. In a disadvantageous manner, with some sensor materials this leads to the pressure sensor also being operated in its non-linear range, which leads to a non-reproducible measurement signal and to an uncertain detection of the combustion chamber pressure in the internal combustion engine.
Des weiteren ist durch die vorbeschriebene Anordnung des Drucksensors mit seiner räumlichen Nähe zum Innenraum des Zylinders und mit seiner direkten Ankopplung an den Glühstift beim Betrieb des Dieselmotors in nachteiliger Weise eine erhebliche thermische Belastung für den Drucksensor verbunden, so dass dieser in seiner Betriebssicherheit gefährdet ist. Dies kann, insbesondere wenn die Signalabgabe des Drucksensors durch Schwankungen zwischen hohen und niedrigen Betriebstemperaturen unstetig wird, zu Funktionsstörungen der Vorrichtung zur Erfassung des Brennraumdrucks bei der Brennkraftmaschine und damit auch zu einer unsicheren Erfassung des Brennraumdrucks bei der Brennkraftmaschine führen.Furthermore, due to the above-described arrangement of the pressure sensor with its spatial proximity to the interior of the Cylinder and with its direct coupling to the glow plug during operation of the diesel engine disadvantageously associated a considerable thermal load for the pressure sensor, so that its operational safety is at risk. This can lead, particularly if the signal output of the pressure sensor is discontinuous due to fluctuations between high and low operating temperatures, to malfunctions of the device for detecting the combustion chamber pressure in the internal combustion engine and thus also to an uncertain measurement of the combustion chamber pressure in the internal combustion engine.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Vorrichtung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass die zuvor erwähnten Unzulänglichkeiten in zufriedenstellendem Maß vermieden wird.The device according to the invention with the characterizing features of the main claim has the advantage that the aforementioned shortcomings are avoided to a satisfactory extent.
Dazu ist der Sensor zwischen dem Fixierglied des Glühstiftes der Glühkerze und einem zweiten Ende der Glühkerze angeordnet. Dies bietet die Möglichkeit, den Sensor von der vollen auf den Glühstift wirkenden Kraft zu entkoppeln und ihn in seinem linearen und hysteresearmen Bereich zu betreiben. Durch die Trennung zwischen der Fixierung desFor this purpose, the sensor is arranged between the fixing element of the glow plug of the glow plug and a second end of the glow plug. This makes it possible to decouple the sensor from the full force acting on the glow plug and to operate it in its linear and low-hysteresis range. By separating the fixation of the
Glühstiftes und der Fixierung des Sensors in der Glühkerze läßt sich der Belastungsbereich des Sensors gezielt eingrenzen, so dass der signaltechnisch optimale Bereich des Sensors genutzt werden kann im Hinblick auf eine sichere und reproduzierbare Erfassung des Brennraumdrucks bei der Brennkraftmaschine .Glow plug and the fixation of the sensor in the glow plug, the load range of the sensor can be deliberately limited, so that the signal-technically optimal range of the sensor can be used with regard to a safe and reproducible detection of the combustion chamber pressure in the internal combustion engine.
Des weiteren ist durch die Beabstandung des Sensors von dem Glühstift und die thermische Anbindung des Glühstiftes über seine Fixierung ans Gehäuse eine thermische Entlastung des Sensors erreicht, so dass dieser hinsichtlich seiner Betriebssicherheit weniger gefährdet ist und damit die Erfassung des Brennraumdrucks bei der Brennkraftmaschine verläßlicher wird.Furthermore, due to the spacing of the sensor from the glow plug and the thermal connection of the glow plug via its fixing to the housing, there is a thermal relief of the Sensor reached so that it is less at risk in terms of operational reliability and thus the detection of the combustion chamber pressure in the internal combustion engine is more reliable.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Vorrichtung möglich.Advantageous further developments and improvements of the device specified in the main claim are possible through the measures listed in the subclaims.
Gemäß vorteilhafter Ausgestaltung erfolgt der zumindest mittelbare Kraftschluß des Sensors mit dem Glühstift mit Vorspannung. Damit wird einem Hystereseeffekt bei der Meßwerterfassung entgegengewirk .According to an advantageous embodiment, the at least indirect non-positive connection of the sensor with the glow plug is carried out with pretension. This counteracts a hysteresis effect in the acquisition of measured values.
Weiterhin vorteilhaft ist, dass der Sensor von dem Glühstift bzw. dem Fixierelement durch wenigstens einen Distanzkörper getrennt ist. Über dessen Ausgestaltung und Steifigkeit kann die auf den Sensor einwirkende Maximalkraft eingestellt werden .It is also advantageous that the sensor is separated from the glow plug or the fixing element by at least one spacer. The maximum force acting on the sensor can be set via its design and rigidity.
Auch vorteilhaft ist, wenn der wenigstens eine Distänzkörper als eine Zwischenhülse, der Sensor als ein Piezoring und das Fixierelement als eine Hülse ausgebildet ist. Dadurch lassen sich Glüh- und Signalleitungen für die Glühstiftkerze bzw. den Sensor vereinfacht hindurchführen.It is also advantageous if the at least one spacer body is designed as an intermediate sleeve, the sensor as a piezo ring and the fixing element as a sleeve. As a result, glow and signal lines for the glow plug or the sensor can be passed through in a simplified manner.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der Figurenbeschreibung näher erläutert. In der Figur ist die Vorrichtung zur Erfassung des Brennraumdrucks bei einer Brennkraftmaschine in einem Längsschnitt vereinfacht dargestellt. Beschreibung des AusführungsbeispielsAn embodiment of the invention is shown in the drawing and explained in more detail in the description of the figures. In the figure, the device for detecting the combustion chamber pressure in an internal combustion engine is shown in simplified form in a longitudinal section. Description of the embodiment
Eine Vorrichtung zur Erfassung des Brennraumdrucks in einer Brennkraftmaschine nach der Figur enthält eine Glühkerze 11, die mittels eines Außengewindes 12 eines rohrförmigenA device for detecting the combustion chamber pressure in an internal combustion engine according to the figure contains a glow plug 11, which by means of an external thread 12 of a tubular
Gehäuses 13 aus Metall in einem nur ansatzweise gezeigten Zylinderkopf 14 der Brennkraftmaschine, insbesondere eines Dieselmotors, montiert ist.Housing 13 made of metal is mounted in a cylinder head 14 of the internal combustion engine, only a part of which is shown, in particular a diesel engine.
Die Glühkerze 11 weist an einem ersten Ende 16 einenThe glow plug 11 has a first end 16
Glühstift 17 auf, der partiell aus dem Gehäuse 13 herausragt und mit einem freien Ende 18 in einen, einen Brennraum bildenden Innenraum 19 der Brennkraftmaschine hineinragt. Der Glühstift 17 ist in der Glühkerze 11 durch ein Fixierglied 22 befestigt. Dieses Fixierglied 22 ist als ein Stützrohr ausgebildet, das in einem Endbereich 23 des anderen Endes des Glühstiftes 17 diesen umfangsseitig festsitzend umfaßt. Das Fixierglied 22 ist seinerseits in das Gehäuse 13 eingepreßt.Glow plug 17, which partially protrudes from the housing 13 and protrudes with a free end 18 into an interior 19 of the internal combustion engine forming a combustion chamber. The glow plug 17 is fastened in the glow plug 11 by a fixing member 22. This fixing member 22 is designed as a support tube which, in one end region 23 of the other end of the glow plug 17, surrounds it fixedly on the circumference. The fixing member 22 is in turn pressed into the housing 13.
Alternativ könnte das Fixierglied 22 auch durch eine Graphithülse realisiert sein oder in Form einer stoffschlüssigen Verbindung, beispielsweise als eine Schweißverbindung ausgeführt sein.Alternatively, the fixing member 22 could also be realized by a graphite sleeve or in the form of a material connection, for example as a welded connection.
Zwischen dem Fixierglied 22 und damit auch zwischen dem Endbereich 23 des Glühstiftes 17 sowie dem zweiten Ende 24 der Glühkerze 11 ist ein Sensor 26 angeordnet. Der Sensor 26 ist von dem Glühstift 17 in dem Ausführungsbeispiel durch ein Distanzglied 27 beabstandet. Der Sensor 26 könnte alternativ auch direkt an dem Glühstift 17 anliegen.A sensor 26 is arranged between the fixing member 22 and thus also between the end region 23 of the glow plug 17 and the second end 24 of the glow plug 11. The sensor 26 is spaced from the glow plug 17 in the exemplary embodiment by a spacer 27. Alternatively, the sensor 26 could also bear directly on the glow plug 17.
Andererseits stützt sich der Sensor 26 unter Zwischenlage eines Distanzelements 28 an einem Fixierelement 29 für den Sensor 24 ab, das festsitzend in dem Gehäuse 13 angeordnet ist und somit die Lage des Sensors 24 in dem Gehäuse 13 festlegt. Das Fixierelement 29 ist beispielsweise als eine in dem Gehäuse 13 verstemmte Hülse ausgebildet und könnte alternativ auch direkt an dem Sensor 26 anliegen.On the other hand, the sensor 26 is supported with the interposition of a spacer 28 on a fixing element 29 for the sensor 24, which is fixedly arranged in the housing 13 and thus defines the position of the sensor 24 in the housing 13. The fixing element 29 is designed, for example, as a sleeve caulked in the housing 13 and, alternatively, could also be in direct contact with the sensor 26.
Das Distanzglied 27 und das Distanzelement 28 sind jeweils in Form einer Zwischenhülse 31 ausgebildet, die vorzugsweise aus Keramik oder Stahl gefertigt ist.The spacer 27 and the spacer 28 are each in the form of an intermediate sleeve 31, which is preferably made of ceramic or steel.
Am zweiten Ende 24 der Glühkerze 11 treten nicht näher detaillierte Kontaktierungselemente in Form von elektrischen Leitungen aus, die beispielsweise einerseits zur Stromversorgung des Glühstiftes 17 sowie andererseits zur Weiterleitung der von dem Sensor 26 abgegebenen Signale dienen.At the second end 24 of the glow plug 11, contacting elements, which are not detailed, emerge in the form of electrical lines, which serve, for example, on the one hand to supply power to the glow plug 17 and on the other hand to forward the signals emitted by the sensor 26.
Der vorbeschriebenen geometrischen Anordnung der wesentlichen Einzelelemente der Vorrichtung zur Erfassung des Brennraumdrucks in einer Brennkraftmaschine liegen folgende Funktionen und Wirkungen zugrunde.The above-described geometric arrangement of the essential individual elements of the device for detecting the combustion chamber pressure in an internal combustion engine is based on the following functions and effects.
Beim Betrieb der Brennkraftmaschine treten in dem Brennraum 19 Verbrennungsgase auf, die aufgrund ihrer Ausdehnungsbeschränkung in dem Brennraum 19 auf den Glühstift 17 eine Druckkraft ausüben. Die axial, inWhen the internal combustion engine is operating, combustion gases occur in the combustion chamber 19 and, due to their expansion restrictions in the combustion chamber 19, exert a compressive force on the glow plug 17. The axial, in
Längsrichtung der Glühkerze 11 gerichteten Komponenten der Druckkraft haben das Bestreben, den Glühstift 17 zum zweiten Ende 24 der Glühkerze 11 hin zu verlagern. Daran wird der Glühstift 17 jedoch weitgehend durch das Fixierglied 22 gehindert, das ein Großteil dieser Druckkräfte aufnimmt und an das Gehäuse 13 und des weiteren an den Zylinderkopf 14 weiterleitet .Components of the pressure force directed in the longitudinal direction of the glow plug 11 strive to displace the glow plug 17 toward the second end 24 of the glow plug 11. However, the glow plug 17 is largely prevented from this by the fixing member 22, which absorbs a large part of these compressive forces and transmits them to the housing 13 and further to the cylinder head 14.
Die Druckkraft auf den Glühstift 17 führt jedoch auch zu einer elastischen Verformung des Glühstiftes 17, welche durch den Sensor 26, der beispielsweise durch einen als Piezoring ausgebildeten Kraft- bzw. Wegsensor realisiert ist, aufgenommen wird. Das von dem Sensor 26 abgegebene Signal kann über Kennlinien mit dem Druck im Brennraum 19 korreliert werden. Im Idealfall ist das vom Sensor 26 abgegebene Signal eine dem Druck im Brennraum 19 proportionale Größe.However, the compressive force on the glow plug 17 also leads to an elastic deformation of the glow plug 17, which by the sensor 26, which is implemented, for example, by a force or displacement sensor designed as a piezo ring. The signal emitted by the sensor 26 can be correlated with the pressure in the combustion chamber 19 via characteristic curves. In the ideal case, the signal emitted by the sensor 26 is a variable proportional to the pressure in the combustion chamber 19.
Der Sensor 26 kann zur Erfassung des Drucks in dem Brennraum 19 auch vorgespannt betrieben werden, um beispielsweise Hystereseeeffekte zu verringern. Dazu ist der Sensor 26, nach Fixierung des Glühstiftes 17 durch das Fixierglied 22 am Gehäuse 13, mit einer vorgegebenen Kraft beaufschlagt, die ihn auch bei nichtbetriebener Brennkraftmaschine, alternativ auch nur mittelbar über das zwischenliegende Distanzglied 27, gegen den Glühstift 17 drückt. Diese Vorkraft wird aufrecht erhalten durch das ortsfest in dem Gehäuse 13 gelagerte Fixierelement 29 oder ein am Gehäuse 13 fixiertes Distanzelement 28.The sensor 26 can also be operated in a preloaded manner in order to detect the pressure in the combustion chamber 19, for example in order to reduce hysteresis effects. For this purpose, the sensor 26, after the glow plug 17 has been fixed by the fixing member 22 on the housing 13, is subjected to a predetermined force which, even when the internal combustion engine is not in operation, alternatively presses it against the glow plug 17 only indirectly via the intermediate spacer 27. This preload is maintained by the fixing element 29, which is fixedly mounted in the housing 13, or a spacer element 28 fixed to the housing 13.
Die maximale Kraft auf den Sensor 26 kann durch dieThe maximum force on the sensor 26 can be determined by the
Steifigkeit des Gehäuses 13, des Fixiergliedes 22 oder desStiffness of the housing 13, the fixing member 22 or the
Fixierelementes 29 eingestellt werden.Fixing element 29 can be set.
Durch die Trennung zwischen dem Fixierglied 22 für den Glühstift 17 und dem Fixierelement 29 für den Sensor 26 kann der signaltechnisch optimale Bereich des Sensors 26 genutzt werden, so dass eine sichere und reproduzierbare Erfassung des Brennraumdrucks bei der Brennkraftmaschine möglich ist. The separation between the fixing member 22 for the glow plug 17 and the fixing element 29 for the sensor 26 means that the area of the sensor 26 that is optimal in terms of signal technology can be used, so that reliable and reproducible detection of the combustion chamber pressure in the internal combustion engine is possible.

Claims

Ansprüche Expectations
1. Vorrichtung zur Erfassung des Zylinderdrucks in einer Brennkraftmaschine, insbesondere in einem Dieselmotor, mit einem Sensor (26) und einer Glühkerze (11), die ein Gehäuse (13) aufweist, mit dem sie vorzugsweise in einem Zylinderkopf (14) der Brennkraftmaschine montierbar ist, wobei die Glühkerze (11) an einem ersten Ende (16) einen Glühstift (17) aufweist, der bei montierter Glühkerze (11) zumindest partiell in einen Brennraum (19) der Brennkraftmaschine ragt und bei der der Glühstift (17) mit einem Fixierglied (22) in der Glühkerze (11) befestigt ist, dadurch gekennzeichnet, dass der Sensor (26) zwischen dem Fixierglied (22) und dem zweiten Ende (24) der Glühkerze (11) angeordnet ist.1. Device for detecting the cylinder pressure in an internal combustion engine, in particular in a diesel engine, with a sensor (26) and a glow plug (11), which has a housing (13) with which it can preferably be mounted in a cylinder head (14) of the internal combustion engine The glow plug (11) has a glow plug (17) at a first end (16) which, when the glow plug (11) is mounted, projects at least partially into a combustion chamber (19) of the internal combustion engine and in which the glow plug (17) has a Fixing element (22) is fastened in the glow plug (11), characterized in that the sensor (26) is arranged between the fixing element (22) and the second end (24) of the glow plug (11).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Sensor (26) von dem Fixierglied (22) des Glühstiftes (17) getrennt ist und zumindest mittelbar durch ein Fixierelement (29) in der Glühkerze (11) befestigt ist.2. Device according to claim 1, characterized in that the sensor (26) from the fixing member (22) of the glow plug (17) is separated and is at least indirectly fixed by a fixing element (29) in the glow plug (11).
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Sensor (26) , zumindest mittelbar, kraftschlüssig mit dem Glühstift (17) verbunden ist.3. Device according to claim 2, characterized in that the sensor (26), at least indirectly, is non-positively connected to the glow plug (17).
Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der zumindest mittelbare Kraftschluß zwischen dem Sensor (26) und dem Glühstift (17) unter einer Vorspannung erfolgt . Apparatus according to claim 3, characterized in that the at least indirect frictional connection between the sensor (26) and the glow plug (17) takes place under a bias.
5. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Sensor (26), zumindest mittelbar, kraftschlüssig mit dem Fixierelement (29) verbunden ist.5. The device according to claim 2, characterized in that the sensor (26), at least indirectly, is non-positively connected to the fixing element (29).
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass der zumindest mittelbare Kraftschluß zwischen dem Sensor (26) und dem Fixierelement (29) unter einer Vorspannung erfolgt.6. The device according to claim 5, characterized in that the at least indirect frictional connection between the sensor (26) and the fixing element (29) takes place under a bias.
7. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Sensor (26) von dem Glühstift (17) durch wenigstens ein Distanzglied (27) getrennt ist.7. Device according to one of claims 1 to 4, characterized in that the sensor (26) from the glow plug (17) is separated by at least one spacer (27).
8. Vorrichtung nach einem der Ansprüche 5 bis 6, dadurch gekennzeichnet, dass der Sensor (26) von dem Fixierelement (29) durch wenigstens ein Distanzelement (28) getrennt ist.8. Device according to one of claims 5 to 6, characterized in that the sensor (26) from the fixing element (29) is separated by at least one spacer element (28).
9. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass das Distanzglied (27) oder das Distanzelement (28) eine Zwischenhülse ist.9. The device according to claim 7 or 8, characterized in that the spacer (27) or the spacer element (28) is an intermediate sleeve.
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die Zwischenhülse als Distanzglied (27) oder Distanzelement (28) aus Graphit ist.10. The device according to claim 9, characterized in that the intermediate sleeve as a spacer (27) or spacer element (28) is made of graphite.
11. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Fixierelement (29) eine mit dem Gehäuse (13) verstemmte Hülse ist.11. Device according to one of the preceding claims, characterized in that the fixing element (29) is a sleeve caulked with the housing (13).
12. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Sensor (26) ein als Piezoring ausgebildeter Kraftsensor ist. 12. Device according to one of the preceding claims, characterized in that the sensor (26) is a force sensor designed as a piezo ring.
PCT/EP2005/050125 2004-03-06 2005-01-13 Device for detecting the combustion chamber pressure in an internal combustion engine WO2005085788A1 (en)

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EP05701508A EP1725848A1 (en) 2004-03-06 2005-01-13 Device for detecting the combustion chamber pressure in an internal combustion engine
US10/591,881 US20070240661A1 (en) 2004-03-06 2005-01-13 Device for Detecting the Combustion-Chamber Pressure in an Internal Combustion Engine
JP2007501255A JP4546997B2 (en) 2004-03-06 2005-01-13 Apparatus for detecting combustion chamber pressure in an internal combustion engine

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DE102004011097.2 2004-03-06
DE102004011097A DE102004011097A1 (en) 2004-03-06 2004-03-06 Device for detecting the combustion chamber pressure in an internal combustion engine

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DE102014223370A1 (en) 2014-11-17 2016-05-19 Robert Bosch Gmbh Assembly and method for joining components
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DE102016206338A1 (en) 2016-04-15 2017-10-19 Robert Bosch Gmbh Method for joining components and corresponding assembly
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US20070240661A1 (en) 2007-10-18
EP1725848A1 (en) 2006-11-29
JP2007526420A (en) 2007-09-13
DE102004011097A1 (en) 2005-09-22

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