DE102004056749B3 - Pressure sensor for pressure measuring heater plug of internal combustion engine, has piezoelectric sensor units with substrative circuits, where one sensor unit is loaded with pressure signal and delivers electrical output signal - Google Patents

Pressure sensor for pressure measuring heater plug of internal combustion engine, has piezoelectric sensor units with substrative circuits, where one sensor unit is loaded with pressure signal and delivers electrical output signal Download PDF

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Publication number
DE102004056749B3
DE102004056749B3 DE200410056749 DE102004056749A DE102004056749B3 DE 102004056749 B3 DE102004056749 B3 DE 102004056749B3 DE 200410056749 DE200410056749 DE 200410056749 DE 102004056749 A DE102004056749 A DE 102004056749A DE 102004056749 B3 DE102004056749 B3 DE 102004056749B3
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Prior art keywords
pressure
sensor
signal
combustion engine
internal combustion
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Expired - Fee Related
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DE200410056749
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German (de)
Inventor
Andrej Hrepevnik
Arno Marto
Frank Pechhold
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BorgWarner Ludwigsburg GmbH
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Beru AG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/028—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs the glow plug being combined with or used as a sensor
    • 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
    • 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
    • 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

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

Abstract

The sensor has piezoelectric sensor units (1, 1a) axially arranged in series. The sensor units have substrative circuits and same output characteristics. The sensor units are axially arranged in series. The sensor unit (1a) is loaded with a pressure signal by combustion pressure of an internal combustion engine and delivers an electrical output signal that corresponds to a mechanical pressure signal.

Description

Die Erfindung betrifft einen Drucksensor für eine Druckmessglühkerze einer Brennkraftmaschine.The The invention relates to a pressure sensor for a Druckmessglühkerze a Internal combustion engine.

Aus der EP 1096141 A2 ist eine Druckmessglühkerze einer Brennkraftmaschine bekannt, die mit einem Drucksensor zum Messen des Verbrennungsdruckes im Zylinder der Brennkraftmaschine ausgerüstet ist. Der Drucksensor ist an der Anschlussseite der Druckmessglühkerze angeordnet und wird mit einer Druckkraft aus dem Verbrennungsdruck im Zylinder beaufschlagt, die über den Glühstab der Druckmessglühkerze übertragen wird.From the EP 1096141 A2 is a Druckmessglühkerze an internal combustion engine is known, which is equipped with a pressure sensor for measuring the combustion pressure in the cylinder of the internal combustion engine. The pressure sensor is arranged on the connection side of the Druckmessglühkerze and is acted upon by a pressure force from the combustion pressure in the cylinder, which is transmitted via the glow rod of the Druckmessglühkerze.

Bei dieser bekannten Druckmessglühkerze erzeugt der Drucksensor dann, wenn er mit einer Kraft vom Verbrennungsdruck in der Verbrennungskammer beaufschlagt wird, ein dementsprechendes elektrisches Signal.at produced this known Druckmessglühkerze the pressure sensor then, when using a force of combustion pressure is acted upon in the combustion chamber, a corresponding electrical Signal.

Dieses Signal ist bei der bekannten Druckmessglühkerze jedoch nicht allein ein Signal, das den Verbrennungsdruck wiedergibt, sondern von Störsignalen überlagert, die beispielsweise aus Vibrationen der Brennkraftmaschine oder sonstigen Einflüssen stammen. Diese Störsignale, die das eigentliche Drucksignal überlagern, beeinträchtigen die Messgenauigkeit.This Signal is not alone in the known Druckmessglühkerze a signal that reflects the combustion pressure, but superimposed by noise, for example, from vibrations of the internal combustion engine or other Influences come. These interfering signals, which superimpose the actual pressure signal, impair the measuring accuracy.

Die der Erfindung zugrunde liegende Aufgabe besteht daher darin, einen Drucksensor für eine Druckmessglühkerze einer Brennkraftmaschine anzugeben, der ein Signal liefern kann, das mit hoher Genauigkeit den Verbrennungsdruck in der Verbrennungskammer der Brennkraftmaschine wiedergibt.The The object underlying the invention is therefore a Pressure sensor for a pressure measuring glow plug an internal combustion engine that can provide a signal, that with high accuracy the combustion pressure in the combustion chamber the internal combustion engine reproduces.

Diese Aufgabe wird gemäß der Erfindung durch die Ausbildung gelöst, die im Anspruch 1 angegeben ist.These Task is carried out according to the invention solved the training, which is specified in claim 1.

Da bei dem erfindungsgemäßen Drucksensor neben dem Sensorelement, das vom Drucksignal aus dem Verbrennungsdruck der Brennkraftmaschine beaufschlagt wird, ein zweites Sensorelement vorgesehen ist, das durch dieses Drucksignal nicht beaufschlagt wird, liefert das zweite Sensorelement ein Ausgangssignal, das ein reines Störsignal ist, während das andere Sensorelement ein Ausgangssignal liefert, das aus dem eigentlichen Messsignal und dem Störsignal besteht. Durch die elektrisch subtraktive Schaltung beider Drucksensoren ergibt sich ein Differenzsignal, das störsignalfrei ist.There in the pressure sensor according to the invention in addition to the sensor element, the pressure signal from the combustion pressure the internal combustion engine is applied, a second sensor element is provided is, which is not acted upon by this pressure signal supplies the second sensor element is an output signal that is a pure interference signal is while the other sensor element provides an output signal from the actual measurement signal and the interference signal exists. By the electrically subtractive circuit of both pressure sensors results a difference signal, the interference-free is.

Besonders bevorzugte Ausgestaltungen und Weiterbildungen des erfindungsgemäßen Drucksensors sind Gegenstand der Ansprüche 2 bis 5.Especially preferred embodiments and further developments of the pressure sensor according to the invention are the subject of the claims 2 to 5.

Im Folgenden werden anhand der zugehörigen Zeichnungen be- sonders bevorzugte Ausführungsbeispiele der Erfindung näher beschrieben. Es zeigenin the The following will be described in particular with reference to the associated drawings preferred embodiments closer to the invention described. Show it

1 eine Schnittansicht eines ersten Ausführungsbeispiels des erfindungsgemäßen Drucksensors, 1 a sectional view of a first embodiment of the pressure sensor according to the invention,

2 eine Schnittansicht eines zweiten Ausführungsbeispiels des erfindungsgemäßen Drucksensors und 2 a sectional view of a second embodiment of the pressure sensor according to the invention and

3 und 4 Schaltbilder der elektrischen Schaltung der Sensorelemente bei den in 1 und 2 dargestellten Drucksensoren. 3 and 4 Schematics of the electrical circuit of the sensor elements in the in 1 and 2 illustrated pressure sensors.

In 1 ist der anschlussseitige Teil einer Druckmessglühkerze für eine Brennkraftmaschine mit einem Ausführungsbeispiel des erfindungsgemäßen Drucksensors dargestellt.In 1 the connection-side part of a Druckmessglühkerze for an internal combustion engine is shown with an embodiment of the pressure sensor according to the invention.

Der anschlussseitige Teil der Druckmessglühkerze, die einen Glühkerzenkörper 6a und einen Stößel 6 umfasst, sitzt in einem Sensorkäfig 4a, der mit dem Glühkerzenkörper 6a mechanisch verbunden ist und in dem ein piezoelektrisches Sensorelement 1a angeordnet ist, das im Sensorkäfig 4a über ein federndes Element, beispielsweise eine Tellerfeder 3a abgestützt ist. Über den Stößel 6 wird eine Kraft F auf das Sensorelement 1a übertragen, die aus dem Verbrennungsdruck in der Verbrennungskammer der Brennkraftmaschine stammt, in die die Druckmessglühkerze eingesetzt ist.The connection-side part of the Druckmessglühkerze, which is a glow plug body 6a and a pestle 6 covers, sits in a sensor cage 4a that with the glow plug body 6a is mechanically connected and in which a piezoelectric sensor element 1a is arranged in the sensor cage 4a via a resilient element, for example a plate spring 3a is supported. About the pestle 6 a force F is applied to the sensor element 1a transmitted, which comes from the combustion pressure in the combustion chamber of the internal combustion engine, in which the Druckmessglühkerze is used.

Der Sensorkäfig 4a des Drucksensors 1a ist in einem zweiten Sensorkäfig 4 angeordnet, der ein zweites Sensorelement 1 enthält, das die gleiche Ausgangssignalcharakteristik wie das erste Sensorelement 1a hat und das über ein federndes Element, beispielsweise eine Tellerfeder 3 im Sensorkäfig 4 abgestützt ist. Elektroden 2 und 2a sind an den Sensorelementen 1, 1a angeordnet und führen das Ausgangssignal der Sensorelemente 1, 1a nach außen.The sensor cage 4a of the pressure sensor 1a is in a second sensor cage 4 arranged, which is a second sensor element 1 contains the same output signal characteristic as the first sensor element 1a has and that via a resilient element, such as a plate spring 3 in the sensor cage 4 is supported. electrodes 2 and 2a are at the sensor elements 1 . 1a arranged and carry the output signal of the sensor elements 1 . 1a outward.

Das Sensorelement 1, das im Sensorkäfig 4 untergebracht ist, wird von dem mechanischen Drucksignal, d. h. von der Kraft F nicht beaufschlagt. Der Sensorkäfig 4 ist mit dem Sensorkäfig 4a mechanisch beispielsweise über ein Gewinde verbunden.The sensor element 1 that in the sensor cage 4 is housed, is not acted upon by the mechanical pressure signal, ie the force F. The sensor cage 4 is with the sensor cage 4a mechanically connected, for example via a thread.

Die Tellerfedern 3, 3a verbinden mechanisch die jeweiligen Elektroden 2, 2a und die zugehörigen Sensoren 1, 1a mit den Sensorkäfigen 4, 4a jeweils.The disc springs 3 . 3a mechanically connect the respective electrodes 2 . 2a and the associated sensors 1 . 1a with the sensor cages 4 . 4a each.

Wie es in den 3 und 4 dargestellt ist, sind die Sensorelemente 1 und 1a elektrisch so geschaltet, dass entweder die beiden negativen oder die beiden positiven Anschlüsse mit dem Sensorkäfig 4a verbunden sind, der an Masse liegt.As it is in the 3 and 4 shown is, are the sensor elements 1 and 1a electrically switched so that either the two negative or the two positive connections with the sensor cage 4a are connected, which is grounded.

Der oben beschriebene Drucksensor arbeitet in der folgenden Weise.Of the The pressure sensor described above operates in the following manner.

Das mechanische Drucksignal, d. h. die Kraft F liegt an dem Sensorsystem des Sensorelementes 1a, das dieses als mechanische Größe anliegende Drucksignal in eine elektrische Größe umwandelt. An der Elektrode 2a tritt dann ein elektrisches Drucksignal auf, das allerdings durch Störsignale überlagert ist, die beispielsweise durch Vibrationen verursacht werden.The mechanical pressure signal, ie the force F is applied to the sensor system of the sensor element 1a which converts this pressure signal applied as a mechanical quantity into an electrical quantity. At the electrode 2a Then occurs an electrical pressure signal, which is superimposed by interference signals, which are caused for example by vibrations.

Das andere Sensorelement 1, an dem kein mechanisches Drucksignal liegt, erfährt nur die Vibrationen und liefert daher an seiner Elektrode 2 nur Störsignale. Dadurch, dass beide Sensorelemente 1, 1a in der in 3 oder 4 dargestellten Weise bezüglich ihrer Ausgangssignal subtraktiv geschaltet sind, können die Störsignale eliminiert werden, so dass am Ausgang des Drucksensors das reine Drucksignal auftritt.The other sensor element 1 , where there is no mechanical pressure signal, experiences only the vibrations and therefore supplies at its electrode 2 only interference signals. Due to the fact that both sensor elements 1 . 1a in the in 3 or 4 shown manner are subtractive connected with respect to their output signal, the interference signals can be eliminated, so that the pure pressure signal occurs at the output of the pressure sensor.

Das in 2 dargestellte Ausführungsbeispiel entspricht im Wesentlichen dem in 1 dargestellten Ausführungsbeispiel mit der Ausnahme, dass nicht wie in 1 die beiden Sensorelemente 1 und 1a axial hintereinander angeordnet sind, sondern bezüglich der Druckmessglühkerze radial in einem Sensorkäfig 4 vorgesehen sind.This in 2 illustrated embodiment corresponds substantially to the in 1 illustrated embodiment with the exception that not as in 1 the two sensor elements 1 and 1a are arranged axially one behind the other, but with respect to the Druckmessglühkerze radially in a sensor cage 4 are provided.

Elektrische Schaltung und Kraftbeaufschlagung der Sensorelemente 1, 1a sind bei dem in 2 dargestellten Ausführungsbeispiel die gleichen wie bei dem in 1 dargestellten Ausführungsbeispiel.Electrical circuit and force application of the sensor elements 1 . 1a are at the in 2 illustrated embodiment, the same as in the 1 illustrated embodiment.

Wie es in 2 dargestellt ist, liegt die aus dem Verbrennungsdruck herrührende Kraft F an einer Bolzenanordnung aus zwei Bolzen 5 und 5a, die dazu dienen, das axial anliegende Drucksignal in ein radiales Drucksignal umzulenken, das an dem Sensorelement 1a liegt.As it is in 2 is shown, the resulting from the combustion pressure force F is located on a bolt assembly of two bolts 5 and 5a which serve to deflect the axially applied pressure signal into a radial pressure signal which is applied to the sensor element 1a lies.

Bei den Bolzen 5 und 5a handelt es sich um keilartige komplementär angeordnete Bauelemente, so dass die Kraft F, die an einem Bolzen 5a liegt, durch eine entsprechende axiale Verschiebung des Bolzens 5a zu einer radialen Versetzung des anderen Bolzen 5 und damit zur gewünschten Kraftumlenkung führt.At the bolts 5 and 5a These are wedge-like components arranged in a complementary manner, so that the force F is applied to a bolt 5a is, by a corresponding axial displacement of the bolt 5a to a radial displacement of the other bolt 5 and thus leads to the desired force deflection.

Das in 2 dargestellte Ausführungsbeispiel arbeitet in der folgenden Weise.This in 2 illustrated embodiment operates in the following manner.

Über die beiden Bolzen 5 und 5a wird das axiale oder vertikale mechanische Drucksignal in ein radiales oder horizontales mechanisches Drucksignal umgelenkt. Das Sensorelement 1a wandelt das anliegende mechanische Drucksignal in ein elektrisches Drucksignal um, das an der Elektrode 2 ansteht, allerdings durch Störsignale beispielsweise aufgrund von Vibrationen überlagert ist. Das zweite Sensorelement 1a, an den kein mechanisches Drucksignal liegt, erfährt nur die Vibrationen, so dass an dessen Elektrode 2a nur ein Störsignal auftritt. Durch die entsprechende elektrische Schaltung, die in den 3 und 4 dargestellt ist, können die Störsignale eliminiert werden.About the two bolts 5 and 5a the axial or vertical mechanical pressure signal is deflected into a radial or horizontal mechanical pressure signal. The sensor element 1a converts the applied mechanical pressure signal into an electrical pressure signal at the electrode 2 is present, but is superimposed by interference, for example, due to vibration. The second sensor element 1a , to which there is no mechanical pressure signal, experiences only the vibrations, so that at its electrode 2a only one interference signal occurs. By the appropriate electrical circuit, which in the 3 and 4 is shown, the noise can be eliminated.

Wie es oben beschrieben wurde, hat der erfindungsgemäße Sensor den Vorteil, dass die Störsignale elektromechanisch kompensiert werden, so dass elektrische Filter nahe am Nutzsignalspektrum nicht notwendig sind. Durch den verminderten Filtereinsatz ist die Phasengenauigkeit verbessert und kann eine einfachere und günstigere Auswerteelektronik verwandt werden. Die Anordnung der Sensorelemente ist einfach und mit geringen Kosten verbunden.As As described above, the sensor according to the invention has the advantage that the interfering signals be electromechanically compensated, so that electrical filters are not necessary near the useful signal spectrum. By the diminished Filter element is the phase accuracy improved and can be a simpler and cheaper Evaluation be used. The arrangement of the sensor elements is simple and low cost.

Claims (5)

Drucksensor für eine Druckmessglühkerze einer Brennkraftmaschine, gekennzeichnet durch zwei Sensorelemente (1, 1a) mit gleicher Ausgangscharakteristik, die bezüglich ihrer Ausgangssignale elektrisch subtraktiv geschaltet sind und von denen nur ein Sensorelement (1a) mit dem Drucksignal (F) vom Verbrennungsdruck der Brennkraftmaschine beaufschlagt ist.Pressure sensor for a pressure measuring glow plug of an internal combustion engine, characterized by two sensor elements ( 1 . 1a ) with the same output characteristic, which are electrically subtracted with respect to their output signals and of which only one sensor element ( 1a ) is acted upon by the pressure signal (F) from the combustion pressure of the internal combustion engine. Drucksensor nach Anspruch 1, dadurch gekennzeichnet, dass die Sensorelemente (1, 1a) axial hintereinander angeordnet sind.Pressure sensor according to claim 1, characterized in that the sensor elements ( 1 . 1a ) are arranged axially one behind the other. Drucksensor nach Anspruch 2, dadurch gekennzeichnet, dass die Sensorelemente (1, 1a) über federnde Elemente (3, 3a) beaufschlagt in Sensorkäfigen (4, 4a) angeordnet sind, die ineinander angeordnet und mechanisch miteinander verbunden sind.Pressure sensor according to claim 2, characterized in that the sensor elements ( 1 . 1a ) via resilient elements ( 3 . 3a ) loaded in sensor cages ( 4 . 4a ) are arranged, which are arranged inside each other and mechanically connected to each other. Drucksensor nach Anspruch 1, dadurch gekennzeichnet, dass die Sensorelemente (1, 1a) bezüglich der Druckmessglühkerze radial zueinander angeordnet sind.Pressure sensor according to claim 1, characterized in that the sensor elements ( 1 . 1a ) are arranged with respect to the Druckmessglühkerze radially to each other. Drucksensor nach Anspruch 4, dadurch gekennzeichnet, dass eine Einrichtung vorgesehen ist, die mechanisch die axial anliegende Druckkraft in eine radiale Druckkraft umwandelt, die an dem einen Sensorelement (1a) liegt.Pressure sensor according to claim 4, characterized in that a device is provided which mechanically converts the axially applied compressive force into a radial compressive force acting on the one sensor element ( 1a ) lies.
DE200410056749 2004-11-24 2004-11-24 Pressure sensor for pressure measuring heater plug of internal combustion engine, has piezoelectric sensor units with substrative circuits, where one sensor unit is loaded with pressure signal and delivers electrical output signal Expired - Fee Related DE102004056749B3 (en)

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DE200410056749 DE102004056749B3 (en) 2004-11-24 2004-11-24 Pressure sensor for pressure measuring heater plug of internal combustion engine, has piezoelectric sensor units with substrative circuits, where one sensor unit is loaded with pressure signal and delivers electrical output signal

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DE200410056749 DE102004056749B3 (en) 2004-11-24 2004-11-24 Pressure sensor for pressure measuring heater plug of internal combustion engine, has piezoelectric sensor units with substrative circuits, where one sensor unit is loaded with pressure signal and delivers electrical output signal

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009129791A2 (en) * 2008-04-23 2009-10-29 Beru Ag Device and method for determining combustion chamber pressure
FR2955215A1 (en) * 2010-01-08 2011-07-15 Continental Automotive France Spark plug for ignition system of spark ignition engine of car, has pressure and rattling detectors respectively measuring pressure and vibrations of cylinder, and arranged in zone between outer surface of core and inner surface of body

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69304835T2 (en) * 1992-07-28 1997-01-30 Ngk Spark Plug Co Spark plug with built-in pressure converter
DE69409788T2 (en) * 1993-01-21 1998-11-12 Scient Generics Ltd METHODS FOR ANALYSIS / SEPARATION
EP1096141A2 (en) * 1999-10-28 2001-05-02 Denso Corporation Glow Plug having a combustion pressure sensor
DE10346295A1 (en) * 2002-10-07 2004-04-22 Denso Corp., Kariya Glow plug with a combustion pressure sensor and structure and method for its installation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69304835T2 (en) * 1992-07-28 1997-01-30 Ngk Spark Plug Co Spark plug with built-in pressure converter
DE69409788T2 (en) * 1993-01-21 1998-11-12 Scient Generics Ltd METHODS FOR ANALYSIS / SEPARATION
EP1096141A2 (en) * 1999-10-28 2001-05-02 Denso Corporation Glow Plug having a combustion pressure sensor
DE10346295A1 (en) * 2002-10-07 2004-04-22 Denso Corp., Kariya Glow plug with a combustion pressure sensor and structure and method for its installation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009129791A2 (en) * 2008-04-23 2009-10-29 Beru Ag Device and method for determining combustion chamber pressure
WO2009129791A3 (en) * 2008-04-23 2010-12-09 Borgwarner Beru Systems Gmbh Device and method for determining combustion chamber pressure
US20110146393A1 (en) * 2008-04-23 2011-06-23 Bernd Last Device and Method for Determining Combustion Chamber Pressure
US8397556B2 (en) * 2008-04-23 2013-03-19 Borgwarner Beru Systems Gmbh Device and method for determining combustion chamber pressure
RU2498248C2 (en) * 2008-04-23 2013-11-10 БоргВарнер БЕРУ Системс ГмбХ Method to determine pressure in combustion chamber and device designed for this purpose
FR2955215A1 (en) * 2010-01-08 2011-07-15 Continental Automotive France Spark plug for ignition system of spark ignition engine of car, has pressure and rattling detectors respectively measuring pressure and vibrations of cylinder, and arranged in zone between outer surface of core and inner surface of body

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