EP1725849A1 - 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

Info

Publication number
EP1725849A1
EP1725849A1 EP05707764A EP05707764A EP1725849A1 EP 1725849 A1 EP1725849 A1 EP 1725849A1 EP 05707764 A EP05707764 A EP 05707764A EP 05707764 A EP05707764 A EP 05707764A EP 1725849 A1 EP1725849 A1 EP 1725849A1
Authority
EP
European Patent Office
Prior art keywords
sensor
glow plug
combustion chamber
housing
fixing member
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.)
Withdrawn
Application number
EP05707764A
Other languages
German (de)
French (fr)
Inventor
Thomas Ludwig
Christoph Kern
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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
Publication of EP1725849A1 publication Critical patent/EP1725849A1/en
Withdrawn legal-status Critical Current

Links

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
    • G01L23/221—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 for detecting or indicating knocks in internal combustion engines
    • G01L23/222—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 for detecting or indicating knocks in internal combustion engines using piezoelectric devices
    • 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
    • G01L23/08—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 operated electrically
    • G01L23/10—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 operated electrically by pressure-sensitive members of the piezoelectric type
    • 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 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 heating section designed as a 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 arrangement of the pressure sensor described above with its spatial proximity to the interior of the cylinder and with its direct coupling to the Glow plug in operation of the diesel engine disadvantageously connected to a significant thermal load on 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.
  • 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 offers the possibility 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-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 sensor is thermally relieved, so that the sensor is relieved with regard to its
  • the at least indirect non-positive connection of the sensor with the fixing member takes place with pretension. This counteracts a hysteresis effect during the acquisition of measured values.
  • the senor is separated from the fixing member or the fixing element by at least one spacer.
  • the maximum force acting on the sensor can be set.
  • 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 is mounted by means of an external thread 12 of a tubular housing 13 made of metal 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 glow plug 17 which partially protrudes from the housing 13 and projects with a free end 18 into an interior 19 of the internal combustion engine which forms 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 projecting slightly beyond the other end of the glow plug 17.
  • 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 the second end 24 of the glow plug 11.
  • the sensor 26 is spaced from the facing end of the fixing member 22 in the exemplary embodiment by a spacer 27.
  • the sensor 26 could also bear directly against the facing end of the fixing member 22.
  • the sensor 26 is supported by a fixing element 29 for the sensor 24, with a spacer 28 being interposed, which is fixed in the housing 13 and thus fixes 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.
  • part of the compressive force on the glow plug 17 leads to an elastic longitudinal deformation of the housing 13 between the end of the fixing member 22 which faces the sensor 26 and the fixing point of the fixing element 29 on the housing 13 on this force transmission path.
  • This deformation is caused by the Sensor 26, which is implemented, for example, in the exemplary embodiment 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 that is 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 also only presses it indirectly against the fixing member 22 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
  • Stiffness of the housing 13, the fixing member 22 or the fixing element 29 can be set.
  • the area of the sensor 26 that is optimal in terms of signal technology can be used are, so that a safe and reproducible detection of the combustion chamber pressure is possible in the internal combustion engine.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

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, longitudinal extension of the housing (13), caused by the combustion chamber pressure, between the end of the fixing member (22) that faces the sensor (26) and the point at which the fixing element (29) is attached to the housing (13). 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 als ein Glühstift ausgebildete Heizabschnitt 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 führt.In this arrangement, the heating section designed as a 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, the arrangement of the pressure sensor described above with its spatial proximity to the interior of the cylinder and with its direct coupling to the Glow plug in operation of the diesel engine disadvantageously connected to a significant thermal load on 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 des 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.For 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 offers the possibility 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 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-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 seinerFurthermore, due to the spacing of the sensor from the glow plug and the thermal connection of the glow plug via its fixation to the housing, the sensor is thermally relieved, so that the sensor is relieved with regard to its
Betriebssicherheit weniger gefährdet ist und damit die Erfassung des Brennraumdrucks bei der Brennkraftmaschine verläßlicher wird.Operational safety is less at risk and therefore the Detection of the combustion chamber pressure in the internal combustion engine becomes 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 Fixierglied mit Vorspannung. Damit wird einem Hystereseeffekt bei der Meßwerterfassung entgegengewirkt .According to an advantageous embodiment, the at least indirect non-positive connection of the sensor with the fixing member takes place with pretension. This counteracts a hysteresis effect during the acquisition of measured values.
Weiterhin vorteilhaft ist, dass der Sensor von dem Fixierglied bzw. dem Fixierelement durch wenigstens einen Distanzkörper getrennt ist. Über dessen Ausgestaltung undIt is also advantageous that the sensor is separated from the fixing member or the fixing element by at least one spacer. About its design and
Steifigkeit kann die auf den Sensor einwirkende Maximalkraft eingestellt werden.Stiffness, the maximum force acting on the sensor can be set.
Auch vorteilhaft ist, wenn der wenigstens eine Distanzkörper 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.An 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.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Eine Vorrichtung zur Erfassung des Brennraumdrucks in einer Brennkraftmaschine nach Figur enthält eine Glühkerze 11, die mittels eines Außengewindes 12 eines rohrförmigen Gehäuses 13 aus Metall in einem nur ansatzweise gezeigten Zylinderkopf 14 der Brennkraftmaschine, insbesondere eines Dieselmotors, montiert ist.A device for detecting the combustion chamber pressure in an internal combustion engine according to the figure contains a glow plug 11 which is mounted by means of an external thread 12 of a tubular housing 13 made of metal 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 einen 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, wobei das Fixierglied 22 das andere Ende des Glühstiftes 17 geringfügig überragt. Das Fixierglied 22 ist seinerseits in das Gehäuse 13 eingepreßt.At a first end 16, the glow plug 11 has a glow plug 17 which partially protrudes from the housing 13 and projects with a free end 18 into an interior 19 of the internal combustion engine which forms 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 projecting slightly beyond the other end of the glow plug 17. 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 dem zweiten Ende 24 der Glühkerze 11 ist ein Sensor 26 angeordnet. Der Sensor 26 ist von dem zugewandten Ende des Fixiergliedes 22 in dem Ausführungsbeispiel durch ein Distanzglied 27 beabstandet. Der Sensor 26 könnte alternativ auch direkt an dem zugewandten Ende des Fixiergliedes 22 anliegen. Andererseits stützt sich in dem Ausführungsbeispiel 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.A sensor 26 is arranged between the fixing member 22 and the second end 24 of the glow plug 11. The sensor 26 is spaced from the facing end of the fixing member 22 in the exemplary embodiment by a spacer 27. Alternatively, the sensor 26 could also bear directly against the facing end of the fixing member 22. On the other hand, in the exemplary embodiment, the sensor 26 is supported by a fixing element 29 for the sensor 24, with a spacer 28 being interposed, which is fixed in the housing 13 and thus fixes 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 durch das Fixierglied 22 gehindert, das diese Druckkräfte an das Gehäuse 13 weiterleitet. Der Großteil dieser Kräfte wird in den Zylinderkopf 14 überführt, mit dem das Gehäuse 13 über das Außengewinde 12 verbunden ist .Components of the compressive 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 prevented from this by the fixing member 22, which transmits these compressive forces to the housing 13. The majority of these forces are in the cylinder head 14 transferred, with which the housing 13 is connected via the external thread 12.
Ein Teil der Druckkraft auf den Glühstift 17 führt jedoch auf diesem Kraftübertragungsweg zu einer elastischen longitudinalen Verformung des Gehäuses 13 zwischen dem Ende des Fixiergliedes 22, das dem Sensor 26 zugewandt ist und der Fixierstelle des Fixierelements 29 an dem Gehäuse 13. Diese Verformung wird durch den Sensor 26, der beispielsweise in dem Ausführungsbeispiel durch einen als Piezoring ausgebildeten Kraft- bzw. Wegsensor realisiert ist, aufgenommen. 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, part of the compressive force on the glow plug 17 leads to an elastic longitudinal deformation of the housing 13 between the end of the fixing member 22 which faces the sensor 26 and the fixing point of the fixing element 29 on the housing 13 on this force transmission path. This deformation is caused by the Sensor 26, which is implemented, for example, in the exemplary embodiment 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 that is 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 Hystereseeffekte 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 das Fixierglied 22 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 also only presses it indirectly against the fixing member 22 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 des Fixierelementes 29 eingestellt werden.Stiffness of the housing 13, the fixing member 22 or the 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. Due to the separation between the fixing member 22 for the glow plug 17 and the fixing element 29 for the sensor 26, the area of the sensor 26 that is optimal in terms of signal technology can be used are, so that a safe and reproducible detection of the combustion chamber pressure is possible in the internal combustion engine.

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 montiert 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 is preferably 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 Glühstift (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) is separated from the glow plug (17) 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 Fixierglied (22) verbunden ist.3. Device according to claim 2, characterized in that the sensor (26), at least indirectly, is non-positively connected to the fixing member (22).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der zumindest mittelbare Kraftschluß zwischen dem Sensor (26) und dem Fixierglied (22) unter einer Vorspannung erfolgt . 4. The device according to claim 3, characterized in that the at least indirect frictional connection between the sensor (26) and the fixing member (22) 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 Fixierglied (22) 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 fixing member (22) by at least one spacer (27) is separated.
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.
EP05707764A 2004-03-06 2005-01-13 Device for detecting the combustion chamber pressure in an internal combustion engine Withdrawn EP1725849A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004011098A DE102004011098A1 (en) 2004-03-06 2004-03-06 Device for detecting the combustion chamber pressure in an internal combustion engine
PCT/EP2005/050123 WO2005085787A1 (en) 2004-03-06 2005-01-13 Device for detecting the combustion chamber pressure in an internal combustion engine

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EP1725849A1 true EP1725849A1 (en) 2006-11-29

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US (1) US7730771B2 (en)
EP (1) EP1725849A1 (en)
JP (1) JP2007527541A (en)
DE (1) DE102004011098A1 (en)
WO (1) WO2005085787A1 (en)

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US20080028841A1 (en) 2008-02-07
DE102004011098A1 (en) 2005-09-22
US7730771B2 (en) 2010-06-08
WO2005085787A1 (en) 2005-09-15
JP2007527541A (en) 2007-09-27

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