DE102005018938A1 - Pressure sensor, for hot media used in internal combustion engine of motor vehicle, has measuring component in high thermal region of flexible component, and conductive strips for connecting measuring component to electronic evaluating unit - Google Patents
Pressure sensor, for hot media used in internal combustion engine of motor vehicle, has measuring component in high thermal region of flexible component, and conductive strips for connecting measuring component to electronic evaluating unit Download PDFInfo
- Publication number
- DE102005018938A1 DE102005018938A1 DE102005018938A DE102005018938A DE102005018938A1 DE 102005018938 A1 DE102005018938 A1 DE 102005018938A1 DE 102005018938 A DE102005018938 A DE 102005018938A DE 102005018938 A DE102005018938 A DE 102005018938A DE 102005018938 A1 DE102005018938 A1 DE 102005018938A1
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- Germany
- Prior art keywords
- pressure sensor
- measuring element
- measuring
- component
- internal combustion
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- 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.)
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Classifications
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- 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
-
- 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
- G01L23/18—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 resistance strain gauges
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Die Erfindung betrifft einen Drucksensor zur Messung von Drücken in heißen Medien.The The invention relates to a pressure sensor for measuring pressures in be called Media.
An moderne Brennkraftmaschinen werden immer höhere Ansprüche im Bezug auf deren Leistungsfähigkeit und Drehmomentcharakteristik gestellt, wobei gewährleistet sein soll, dass die Brennkraftmaschine einen geringen Treibstoffverbrauch aufweist und sehr wenig Schadstoffe emittiert. Hierzu wird der Steuerung der Brennkraftmaschine eine Reihe von Messwerten zur Verfügung gestellt, um die Verbrennung in den Zylindern der Brennkraftmaschine optimal zu gestalten. Diese Signale werden zum Beispiel aus der Messung der Luftmasse, die von der Brennkraftmaschine angesaugt wird, der Temperatur in Bestimmten Bereichen der Brennkraftmaschine, der Drehzahl und der Abgasrückführungsrate bezogen. Mit diesen Daten bestimmt die Steuerung der Brennkraftmaschine die Einspritzmenge des einzuspritzenden Treibstoffs und den Zeitpunkt der Einspritzung. Darüber hinaus kann zum Beispiel bei turbogeladenen Brennkraftmaschinen die Steuerung der Turboladergeometrie erfolgen.At Modern internal combustion engines are becoming increasingly demanding in terms of their performance and torque characteristics, while ensuring that the Internal combustion engine has a low fuel consumption and emitted very little pollutants. For this the control of the Internal combustion engine provided a set of readings, to the combustion in the cylinders of the internal combustion engine optimally to design. These signals are for example from the measurement the air mass sucked by the internal combustion engine, the Temperature in certain areas of the internal combustion engine, the speed and the exhaust gas recirculation rate based. With this data determines the control of the internal combustion engine the injection quantity of the fuel to be injected and the time the injection. About that In addition, for example, in turbocharged internal combustion engines the control of the turbocharger geometry done.
Zur direkten Überwachung des Verbrennungsvorganges in den Zylindern einer Brennkraftmaschine ist es bekannt, den Zylinderinnendruck zu messen. Dabei wird in jedem Zylinder ein Drucksensor benötigt, der den Verbrennungsdruck im Zylinder kontinuierlich auch während des Verbrennungsprozesses misst. Diese Messtechnik wird bereits in der Motorenentwicklung zur Optimierung der Motorindizierung verwendet. Damit ist diese Technologie im Bereich der Entwicklung von Brennkraftmaschinen bekannt.for direct monitoring the combustion process in the cylinders of an internal combustion engine it is known to measure the cylinder internal pressure. It will be in Each cylinder requires a pressure sensor that measures the combustion pressure in the cylinder continuously even during the combustion process measures. This measurement technology is already used in engine development used to optimize motor indexing. This is this Technology known in the field of development of internal combustion engines.
Zur Messung des Druckes im Zylinder kommen verschiedene Technologien in Frage. Ein Sensorkonzept basiert zum Beispiel auf Piezokeramiken, die sich entsprechend des Druckes in dem Zylinder verformen und Signale liefern, die dem Zylinderinnendruck entsprechen. Diese Sensorkonzepte sind jedoch sehr teuer und daher für den Einsatz im Serienfahrzeug ungeeignet. Auch eine optische Vermessung der Verformung eines dehnbaren Elementes wurde vorgeschlagen, die auch auf Grund des hohen Preises im Massenmarkt der Automobilindustrie nicht realisierbar ist. Dünnfilmmesselemente werden im industriellen Einsatz zum Beispiel bei Stationärmaschinen in Blockheizkraftwerken verwendet, um den Zylinderinnendruck kontinuierlich zu messen. Für den Einsatz in Kraftfahrzeugen sind diese Sensorelemente jedoch baulich wesentlich zu groß, so dass sie bei den üblichen Kraftfahrzeugbrennkraftmaschinen nicht verwendet werden können.for Measuring the pressure in the cylinder come different technologies in question. A sensor concept is based for example on piezoceramics, the deform according to the pressure in the cylinder and signals deliver, which correspond to the cylinder internal pressure. These sensor concepts However, they are very expensive and therefore suitable for use in production vehicles not suitable. Also an optical measurement of the deformation of a stretchable Elementes has been proposed, which is also due to the high price in the mass market of the automotive industry is not feasible. Thin film measurement elements are used in industrial applications, for example in stationary machines Used in combined heat and power plants to continuously increase the internal cylinder pressure to eat. For However, these sensor elements are the use in motor vehicles structurally much too big, so they are at the usual Automotive internal combustion engines can not be used.
Aufgabe der vorliegenden Erfindung ist es daher, einen Drucksensor zur Messung von Drücken in heißen Medien anzugeben, der mit kleinen Abmessungen herstellbar ist.task Therefore, it is the object of the present invention to provide a pressure sensor for measurement from pressing in be called Specify media that can be produced with small dimensions.
Diese Aufgabe wird durch die Merkmale des unabhängigen Anspruchs 1 gelöst.These The object is solved by the features of independent claim 1.
Dadurch, dass das Messelement in einem thermisch hoch belasteten Bereich des dehnbaren Elementes angeordnet ist und ebenfalls in Dünnfilmtechnik ausgebildete Leiterbahnen aufweist, die zur Kontaktierung des Messelementes mit einer Auswerteelektronik dienen und die sich aus dem thermisch hoch belasteten Bereich in einen thermisch gering belasteten Bereich des dehnbaren Elementes erstrecken, kann die nachfolgende Auswerteelektronik zum Beispiel mit herkömmlichen Lötprozessen angebunden werden. Das Messelement kann in Dünnfilmtechnik sehr klein im thermisch hoch belasteten Bereich des dehnbaren Elementes aufgebaut werden. Durch die am Messelement ausgebildeten, ebenfalls in Dunnfilmtechnik erzeugten Leiterbahnen werden die vom Messelement erzeugen Signale aus dem thermisch hoch belasteten Bereich herausgeführt und können im thermisch gering belasteten Bereich abgegriffen wer den. Auch die Leiterbahnen sind sehr klein auszubilden, wodurch ein äußerst Platz sparender Aufbau des Drucksensors ermöglicht wird. Da die Lötpunkte im thermisch gering belasteten Bereich des dehnbaren Elements am Ende Leiterbahnen angeordnet sind, werden sie thermisch wenig belastet. Das in Dünnfilmtechnik ausgebildete Messelement mit seinen Leiterbahnen verträgt hingegen eine hohe thermische Belastung problemlos.Thereby, that the measuring element in a thermally highly loaded area the extensible element is arranged and also in thin film technology having trained conductor tracks, which for contacting the measuring element Serve with an evaluation and the resulting from the thermally high loaded area in a thermally low loaded area extend the expandable element, the subsequent evaluation of the Example with conventional soldering processes be connected. The measuring element can be very small in thin film technology constructed thermally highly loaded area of the expandable element become. By trained on the measuring element, also in Dunnfilmtechnik produced tracks are the signals generated by the measuring element led out of the thermally highly stressed area and can tapped in the thermally low loaded area who the. Also the tracks are very small form, which makes an extremely space saving construction of the pressure sensor is made possible. Because the solder points in the thermally low loaded area of the stretchable element on End conductor tracks are arranged, they are thermally stressed little. The in thin film technology however, trained measuring element with its interconnects tolerates a high thermal load easily.
Bei einer vorteilhaften Weiterbildung ist dass das dehnbare Element zylinderförmig ausgebildet. Das zylinderförmige Element zeigt ein besonders homogenes Dehnungsverhalten, wodurch die Signale in hoher Qualität zu gewinnen sind.at An advantageous development is that the expandable element cylindrically educated. The cylindrical one Element shows a particularly homogeneous elongation behavior, which the signals in high quality to win.
Bei einer Ausgestaltung weist das dehnbare Element eine abgeflachte Zylinderwand auf. Auf der abgeflachten Zylinderwand kann das Messelement besonders einfach aufgebracht werden.at In one embodiment, the stretchable element has a flattened Cylinder wall on. On the flattened cylinder wall, the measuring element can be particularly easy to apply.
Bei einer Weiterbildung sind das Messelement und das dehnbaren Element von einer Schutzhülse umgeben. Die Schutzhülse biete Schutz gegen mechanische Beschädigungen und eine Verschmutzung des Messelementes und kann sie hermetisch abschließen. Fertigungstechnisch besonders einfach gestaltet sich dies, wenn die Schutzhülse mittels einer Schweißnaht in axiale Richtung des zylinderförmigen dehnbaren Elements mit diesem verbunden ist.at a further development are the measuring element and the expandable element from a protective sleeve surround. The protective sleeve offer protection against mechanical damage and dirt of the measuring element and can hermetically complete it. manufacturing technology This is particularly simple if the protective sleeve by means of a weld in the axial direction of the cylindrical stretchable element is connected to this.
Im Rahmen der Dünnfilmtechnik ist es besonders einfach ohmsche Widerstände auszubilden. Daher ist es vorteilhaft, wenn das Messelement aus mindestens vier Widerständen aufgebaut ist. Dabei lassen sich die Signale der Widerstände sehr leicht auswerten, wenn sie als Wheatstonesche Brücke verschaltet sind.in the Framework of thin-film technology It is particularly easy to form ohmic resistors. thats why It is advantageous if the measuring element constructed from at least four resistors is. The signals of the resistors can be evaluated very easily, when connected as a Wheatstone bridge are.
Bei einer vorteilhaften Weiterbildung sind die vier Widerstände örtlich dergestalt auf dem dehnbaren Element angeordnet, dass die vom heißen Medium auf das dehnbare Element übertragenen transienten Temperaturfelder keine oder nur vernachlässigbar kleine Temperaturunterschiede an den Widerständen hervorrufen. Durch diese Maßnahme weisen alle Widerstände des Messelementes immer eine einheitliche Temperatur auf, womit die Wheatstonesche Brückeschaltung automatisch ein temperaturkompensiertes Messsignal liefert. Zur Gleichverteilung der Temperatur an den Widerständen des Messelementes ist es auch vorteilhaft, wenn zwischen dem dehnbaren Element und der Schutzhülse ein Wärme leitendes Medium vorgesehen ist, das eine gleichmäßige Wärmeverteilung bewirkt. Ein Fluid bewirkt diese Gleichverteilung besonders gut, da es neben der interatomaren oder -molekularen Wärmeleitung auch eine konvektionsgetriebene Wärmeverteilung ermöglicht und dabei eine hohe Wärmekapazität aufweist.at According to an advantageous development, the four resistors are locally shaped arranged on the expansible element, that of the hot medium transferred to the stretchable element transient temperature fields none or only negligible cause small temperature differences on the resistors. Through this measure reject all resistance of the measuring element always a uniform temperature, which the Wheatstone bridge circuit automatically supplies a temperature-compensated measuring signal. for Equal distribution of the temperature at the resistors of the measuring element is It is also advantageous if between the expandable element and the protective sleeve a heat conductive medium is provided, the uniform heat distribution causes. A fluid causes this uniform distribution particularly well, since it is next to the interatomic or molecular heat conduction also allows a convection-driven heat distribution and while having a high heat capacity.
Bei einer Ausgestaltung ist am Drucksensor ein Gewinde ausgebildet, mit dem der Drucksensor in einen Brennraum schraubbar ist. Dies ermöglicht eine besonders leichte und gasdichte Verbindung des Drucksensors mit dem Brennraum. Wenn, gemäß eine nächsten vorteilhaften Weiterbildung, die Schraubkräfte auf die Schutzhülse übertragbar sind, können diese Kräfte keinen Einfluss auf das Messelement nehmen, wodurch eine fehlerfreie Messung der Drücke gewährleistet ist.at In one embodiment, a thread is formed on the pressure sensor, with which the pressure sensor can be screwed into a combustion chamber. This allows one particularly light and gas-tight connection of the pressure sensor with the combustion chamber. If, according to a next advantageous Continuing education, the screw forces transferable to the protective sleeve are, can these forces do not affect the measuring element, resulting in a faultless Measurement of the pressures guaranteed is.
Ausführungsbeispiele der Erfindung werden im Folgenden anhand der Figuren erläutert. Dabei zeigt:embodiments The invention will be explained below with reference to the figures. Showing:
Wenn der Ducksensor in eine Glühkerze, eine Zündkerze oder eine Einspritzdüse integriert ist, kann ein ohne hin in der Brennkraftmaschine enthaltenes Bauteil zur Überwachung des Zylinderinnendruckes verwendet werden. Zusätzliche Bohrungen durch die Zylinderwand oder im Zylinderkopf werden somit nicht benötigt.If the Duck sensor into a glow plug, a spark plug or an injection nozzle is integrated, can be included without in the internal combustion engine Component for monitoring the cylinder internal pressure can be used. Additional holes through the Cylinder wall or in the cylinder head are thus not needed.
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102005018938A DE102005018938A1 (en) | 2005-04-22 | 2005-04-22 | Pressure sensor, for hot media used in internal combustion engine of motor vehicle, has measuring component in high thermal region of flexible component, and conductive strips for connecting measuring component to electronic evaluating unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102005018938A DE102005018938A1 (en) | 2005-04-22 | 2005-04-22 | Pressure sensor, for hot media used in internal combustion engine of motor vehicle, has measuring component in high thermal region of flexible component, and conductive strips for connecting measuring component to electronic evaluating unit |
Publications (1)
Publication Number | Publication Date |
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DE102005018938A1 true DE102005018938A1 (en) | 2006-11-02 |
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DE102005018938A Ceased DE102005018938A1 (en) | 2005-04-22 | 2005-04-22 | Pressure sensor, for hot media used in internal combustion engine of motor vehicle, has measuring component in high thermal region of flexible component, and conductive strips for connecting measuring component to electronic evaluating unit |
Country Status (1)
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DE (1) | DE102005018938A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2925777A1 (en) * | 2007-12-21 | 2009-06-26 | Siemens Vdo Automotive Sas | INTEGRATED PRESSURE SENSOR IGNITION CANDLE FOR INTERNAL COMBUSTION ENGINE |
JP2010255427A (en) * | 2009-04-21 | 2010-11-11 | Denso Corp | Fuel injection valve |
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DE3037753A1 (en) * | 1980-10-06 | 1982-05-13 | Siemens AG, 1000 Berlin und 8000 München | ARRANGEMENT FOR MEASURING THE PRESSURE HISTORY IN CYLINDRICAL HOLLOW BODIES |
JPS5852540A (en) * | 1981-09-25 | 1983-03-28 | Mitsubishi Heavy Ind Ltd | Pressure gauge |
DE3327265A1 (en) * | 1982-07-30 | 1984-02-02 | CISE-Centro Informazioni Studi Esperienze S.p.A., Milano | IMPROVED METER FOR MEASURING PRESSURE OF A LIQUID, ESPECIALLY AN AGGRESSIVE AND HOT LIQUID |
JPH01296130A (en) * | 1988-05-24 | 1989-11-29 | Nissan Motor Co Ltd | Pressure sensor |
DD279949A1 (en) * | 1989-02-13 | 1990-06-20 | Akad Wissenschaften Ddr | CAPACITIVE PRESSURE TRANSDUCER |
DE4016872A1 (en) * | 1990-05-25 | 1991-11-28 | Wiegand Gmbh & Co Alexander | Durable, stable gauge for testing IC engine pressures - uses strain gauge linked to metal diaphragm which is subjected to pressure being measured |
US5165284A (en) * | 1990-04-05 | 1992-11-24 | Matsushita Electric Industrial Co., Ltd. | Pressure sensor utilizing a magnetostriction effect |
JPH07239282A (en) * | 1994-02-28 | 1995-09-12 | Mitsubishi Heavy Ind Ltd | Cylinder inner pressure sensor |
JPH08110279A (en) * | 1994-10-11 | 1996-04-30 | Mitsubishi Heavy Ind Ltd | In-cylinder pressure sensor |
DE10153424A1 (en) * | 2001-11-03 | 2003-05-15 | Kmw Duennschichttechnik Und Mi | Pressure transducers, in particular for measuring cylinder pressure in engines and methods for producing the same |
-
2005
- 2005-04-22 DE DE102005018938A patent/DE102005018938A1/en not_active Ceased
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US2420148A (en) * | 1943-11-08 | 1947-05-06 | Douglas Aircraft Co Inc | Pressure indicator |
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DE3037753A1 (en) * | 1980-10-06 | 1982-05-13 | Siemens AG, 1000 Berlin und 8000 München | ARRANGEMENT FOR MEASURING THE PRESSURE HISTORY IN CYLINDRICAL HOLLOW BODIES |
JPS5852540A (en) * | 1981-09-25 | 1983-03-28 | Mitsubishi Heavy Ind Ltd | Pressure gauge |
DE3327265A1 (en) * | 1982-07-30 | 1984-02-02 | CISE-Centro Informazioni Studi Esperienze S.p.A., Milano | IMPROVED METER FOR MEASURING PRESSURE OF A LIQUID, ESPECIALLY AN AGGRESSIVE AND HOT LIQUID |
JPH01296130A (en) * | 1988-05-24 | 1989-11-29 | Nissan Motor Co Ltd | Pressure sensor |
DD279949A1 (en) * | 1989-02-13 | 1990-06-20 | Akad Wissenschaften Ddr | CAPACITIVE PRESSURE TRANSDUCER |
US5165284A (en) * | 1990-04-05 | 1992-11-24 | Matsushita Electric Industrial Co., Ltd. | Pressure sensor utilizing a magnetostriction effect |
DE4016872A1 (en) * | 1990-05-25 | 1991-11-28 | Wiegand Gmbh & Co Alexander | Durable, stable gauge for testing IC engine pressures - uses strain gauge linked to metal diaphragm which is subjected to pressure being measured |
JPH07239282A (en) * | 1994-02-28 | 1995-09-12 | Mitsubishi Heavy Ind Ltd | Cylinder inner pressure sensor |
JPH08110279A (en) * | 1994-10-11 | 1996-04-30 | Mitsubishi Heavy Ind Ltd | In-cylinder pressure sensor |
DE10153424A1 (en) * | 2001-11-03 | 2003-05-15 | Kmw Duennschichttechnik Und Mi | Pressure transducers, in particular for measuring cylinder pressure in engines and methods for producing the same |
Non-Patent Citations (8)
Title |
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Pat. Abstr. of Japan & JP 07239282 A * |
Pat. Abstr. of Japan & JP 08110279 A * |
Pat. Abstr. of Japan & JP 58052540 A * |
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Pat. Abstr. of Japan JP 07-239282 A |
Pat. Abstr. of Japan JP 08-110279 A |
Pat. Abstr. of Japan JP 58-052540 A |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2925777A1 (en) * | 2007-12-21 | 2009-06-26 | Siemens Vdo Automotive Sas | INTEGRATED PRESSURE SENSOR IGNITION CANDLE FOR INTERNAL COMBUSTION ENGINE |
WO2009106732A1 (en) * | 2007-12-21 | 2009-09-03 | Continental Automotive France | Spark plug with in-built pressure sensor for internal combustion engines |
JP2010255427A (en) * | 2009-04-21 | 2010-11-11 | Denso Corp | Fuel injection valve |
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