WO1997028430A1 - Device for determining changes in pressure in the combustion chamber of an internal-combustion engine - Google Patents

Device for determining changes in pressure in the combustion chamber of an internal-combustion engine Download PDF

Info

Publication number
WO1997028430A1
WO1997028430A1 PCT/CH1997/000026 CH9700026W WO9728430A1 WO 1997028430 A1 WO1997028430 A1 WO 1997028430A1 CH 9700026 W CH9700026 W CH 9700026W WO 9728430 A1 WO9728430 A1 WO 9728430A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
pressure
medium
spring
designed
Prior art date
Application number
PCT/CH1997/000026
Other languages
German (de)
French (fr)
Inventor
David Stedham
Original Assignee
Electrical Engineering Company Ltd.
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 Electrical Engineering Company Ltd. filed Critical Electrical Engineering Company Ltd.
Publication of WO1997028430A1 publication Critical patent/WO1997028430A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
    • G01L9/0039—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means using photoelectric means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F2007/0097—Casings, e.g. crankcases or frames for large diesel engines

Definitions

  • the invention relates to a device for determining the pressure profile in the combustion chamber of an internal combustion engine, in particular a large diesel engine, according to the preamble of claim 1.
  • a device of the type mentioned at the outset is known, for example, from EP-A-0 208 545.
  • This device has a housing in which the pressure-sensitive sensor is formed by a membrane which is arranged in a bottom part of the housing and is designed to be resilient in such a way that it enables a deflection corresponding to the pressure. These deflections are scanned by a light beam and produce light fluctuations corresponding to the deflection and thus to the pressure, which are converted into electrical signals for evaluation.
  • the bottom part with the membrane separates the light guides opposite the membrane from the medium to be examined.
  • the membrane has only a low fatigue strength and wears out quickly due to the high load changes caused by the rotational speeds of the internal combustion engine.
  • the object of the invention is to improve a device of the type mentioned at the outset so that it does not have the disadvantages mentioned.
  • the transmitter no longer has to be designed as a spring, but can be designed to be sufficiently stable to withstand the high load changes and possibly aggressive components of the medium to be examined.
  • the transmitter is now no longer arranged directly on the housing base, but rather at a certain distance above the bellows, so that it is no longer directly surrounded by aggressive components of the medium but is separated by a less aggressive medium cushion in the bellows.
  • the device can also be adapted to different operating conditions in a simple, inexpensive manner, that is to say to different engine characteristics. Since the spring force required to absorb pressure is due to the spring element is taken over, the bellows need not have any spring properties, but can only be designed according to the criteria for a medium-tight and permanent connection between the transmitter and the opening in the housing base. This results in a device which, on the one hand, allows a simple adaptation to different operating conditions despite the very simple construction and, on the other hand, in particular has a high long-term stability with constant measurement accuracy.
  • a helical or conical spring can be used as the spring element, but the embodiment according to claim 3 is particularly preferred.
  • a disk spring By means of a disk spring, high pressures in particular can also be converted into small measuring paths.
  • the figure shows a device for determining the pressure curve in the combustion chamber of an internal combustion engine, in particular a large diesel engine.
  • a pot-like housing 2 of the device according to the invention is inserted in an opening in the wall 1 of a combustion chamber 10 of such an internal combustion engine.
  • a bellows 4 is arranged in a medium-tight manner.
  • the transmitter 5 is designed to be rigid and is supported on a spring element 6 which acts as a pressure / displacement transducer and is preferably designed as a plate spring.
  • the spring element 6 is supported on a housing part 7.
  • spring elements 6 with the same installation dimensions but different spring characteristics can be used.
  • the spring constant of the spring element is substantially larger than the spring constant of the medium-separating sensor, so that its spring constant practically does not influence the pressure / displacement conversion.
  • the side 5 'of the transmitter facing away from the opening 3 is designed to be light-reflecting and faces a feeding light guide 8 and a discharging light guide 9, which, like EP-A-0 208 545, are connected to a corresponding evaluation unit (not shown here) .
  • This configuration converts an axial deflection of the transmitter caused by the medium to be monitored into corresponding fluctuations in the reflected light, it being possible for these light fluctuations to be converted into electrical signals in a corresponding evaluation device.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The device proposed is particularly effective and long-lived by virtue of the fact that the housing (2) has, in its floor, an opening (3) over which a bellows (4) is fitted so that it makes a fluid-tight seal. Inside the housing, the bellows is closed off by an actuator which makes a fluid-tight seal and which is held in position inside the housing against the pressure of the fluid by means of a spring.

Description

Vorrichtung zur Ermittlung des Druckverlaufes in der Brennkam¬ mer eines VerbrennungsmotorsDevice for determining the pressure curve in the combustion chamber of an internal combustion engine
Technisches GebietTechnical field
Die Erfindung betrifft eine Vorrichtung zur Ermittlung des Druckverlaufes in der Brennkammer eines Verbrennungsmotors, insbesondere eines Grossdieselmotors, gemäss Oberbegriff des Anspruches 1.The invention relates to a device for determining the pressure profile in the combustion chamber of an internal combustion engine, in particular a large diesel engine, according to the preamble of claim 1.
Stand der TechnikState of the art
Eine Vorrichtung der eingangs genannten Art ist beispielsweise aus der EP-A-0 208 545 bekannt. Diese Vorrichtung weist ein Gehäuse auf, bei dem der auf Druck ansprechende Geber durch eine Membrane gebildet ist, die in einem Bodenteil des Gehäu¬ ses angeordnet und derart federnd ausgebildet, dass sie eine dem Druck entsprechende Durchbiegung ermöglicht. Diese Durch¬ biegungen werden von einem Lichtstrahl abgetastet und erzeugen der Durchbiegung und damit dem Druck entsprechende Licht¬ schwankungen, die zur Auswertung in elektrische Signale umge¬ wandelt werden. Der Bodenteil mit der Membrane trennt die der Membrane gegenüberstehenden Lichtleiter von dem zu untersu¬ chenden Medium. Nachteilig ist es jedoch, dass die Membrane nur eine geringe Dauerstandfestigkeit aufweist und aufgrund der durch die Drehzahlen des Verbrennungsmotors bedingten hohen Lastwechsel schnell verschleisst. Dieser Verschleiss wird noch unterstützt dadurch, dass die Membrane unmittelbar dem zu untersuchenden, häufig aggressiven Medium ausgesetzt ist. Der Verschleiss führt auch sehr schnell zu einer Änderung der Widerstandsfähigkeit und Federeigenschaften der Membrane, wodurch eine Verfälschung der Messergebnisse stattfindet. Hinzu kommt überdies, dass bei Anwendung der Vorrichtung für verschiedene Verbrennungsmotoren mit unterschiedlichen Charak¬ teristiken jeweils andere Bodenteile verwendet werden müssen, um die Vorrichtung dem Verbrennungsmotor anzupassen.A device of the type mentioned at the outset is known, for example, from EP-A-0 208 545. This device has a housing in which the pressure-sensitive sensor is formed by a membrane which is arranged in a bottom part of the housing and is designed to be resilient in such a way that it enables a deflection corresponding to the pressure. These deflections are scanned by a light beam and produce light fluctuations corresponding to the deflection and thus to the pressure, which are converted into electrical signals for evaluation. The bottom part with the membrane separates the light guides opposite the membrane from the medium to be examined. However, it is disadvantageous that the membrane has only a low fatigue strength and wears out quickly due to the high load changes caused by the rotational speeds of the internal combustion engine. This wear is further supported by the fact that the membrane is directly exposed to the often aggressive medium to be examined. The wear quickly leads to a change in the resistance and spring properties of the membrane, which leads to a falsification of the measurement results. In addition, when the device is used for different internal combustion engines with different characteristics, different floor parts must be used in order to adapt the device to the internal combustion engine.
Darstellung der ErfindungPresentation of the invention
Aufgabe der Erfindung ist es, eine Vorrichtung der eingangs genannten Art so zu verbessern, dass sie die genannten Nach¬ teile nicht aufweist.The object of the invention is to improve a device of the type mentioned at the outset so that it does not have the disadvantages mentioned.
Die Aufgabe wird erfindungsgemäss gelöst durch die kennzeich¬ nenden Merkmale des Anspruches 1.The object is achieved according to the invention by the characterizing features of claim 1.
Dadurch, dass anstelle der Membrane eine Öffnung im Boden des Gehäuses angeordnet ist, an der ein Faltenbalg mediumsdicht befestigt ist, an dessen innerem Ende wiederum der Geber mediumsdicht angeschlossen ist, der sich überdies über eine Feder im Inneren des Gehäuses abstützt, ergeben sich ganz entscheidende Vorteile. Der Geber muss nun nicht mehr federnd als Membrane ausgebildet sein, sondern kann ausreichend stabil ausgestaltet sein, um den hohen Lastwechseln und allenfalls agressiven Bestandteilen des zu untersuchenden Mediums dauer¬ haft zu widerstehen. Der Geber ist nun auch nicht mehr unmit¬ telbar am Gehäuseboden angeordnet sondern über den Faltenbalg mit einem gewissen Abstand, sodass er nicht mehr unmittelbar von aggressiven Bestandteilen des Mediums umspült wird sondern durch ein weniger aggressives Mediumspolster im Faltenbalg getrennt ist. Da die Feder, welche den Geber abstützt, im Inneren des Gehäuses vom Medium geschützt angeordnet ist, unterliegt auch diese keinem durch das Medium bedingten Ver¬ schleiss und kann deshalb eine hohe Lebensdauer aufweisen. Durch Austausch der Federelemente kann die Vorrichtung auch auf einfache, kostengünstige Weise auf verschiedene Betriebs¬ bedingungen, das heisst an verschiedene Motorkennlinien ange- passt werden. Da die zur Druckaufnahme erforderliche Feder¬ kraft durch das im Inneren des Gehäuses angeordnete Feder- element übernommen wird, braucht der Faltenbalg keinerlei Federeigenschaften aufzuweisen, sondern kann ausschliesslich nach den Kriterien für eine mediumsdichte und dauerhafte Ver¬ bindung zwischen dem Geber und der Öffnung im Gehäuseboden ausgestaltet sein. Damit ergibt sich eine Vorrichtung die trotz sehr einfachen Aufbaus einerseits auf einfache Weise eine Anpassung an verschiedene Betriebsbedingungen ermöglicht und andererseits insbesondere eine hohe Langzeitstabilität bei gleichbleibender Messgenauigkeit aufweist.The fact that instead of the membrane there is an opening in the bottom of the housing, to which a bellows is attached in a medium-tight manner, at the inner end of which the sensor is connected in a medium-tight manner, which is also supported by a spring in the interior of the housing, results in very decisive factors Benefits. The transmitter no longer has to be designed as a spring, but can be designed to be sufficiently stable to withstand the high load changes and possibly aggressive components of the medium to be examined. The transmitter is now no longer arranged directly on the housing base, but rather at a certain distance above the bellows, so that it is no longer directly surrounded by aggressive components of the medium but is separated by a less aggressive medium cushion in the bellows. Since the spring, which supports the transmitter, is arranged in the interior of the housing so that it is protected from the medium, it is also not subject to wear caused by the medium and can therefore have a long service life. By exchanging the spring elements, the device can also be adapted to different operating conditions in a simple, inexpensive manner, that is to say to different engine characteristics. Since the spring force required to absorb pressure is due to the spring element is taken over, the bellows need not have any spring properties, but can only be designed according to the criteria for a medium-tight and permanent connection between the transmitter and the opening in the housing base. This results in a device which, on the one hand, allows a simple adaptation to different operating conditions despite the very simple construction and, on the other hand, in particular has a high long-term stability with constant measurement accuracy.
Als Federelement kann gemäss Anspruch 2 eine Schrauben- oder Kegelfeder verwendet werden, besonders bevorzugt ist jedoch die Ausbildung nach Anspruch 3. Mittels einer Tellerfeder lassen sich insbesondere auch hohe Drücke in kleine Messwege umwandeln.According to claim 2, a helical or conical spring can be used as the spring element, but the embodiment according to claim 3 is particularly preferred. By means of a disk spring, high pressures in particular can also be converted into small measuring paths.
Kurze Beschreibung der ZeichnungBrief description of the drawing
Ein schematisches Ausführungsbeispiel der Erfindung wird nachfolgend anhand einer Figur näher beschrieben, welche die Vorrichtung im Vertikalschnitt zeigt.A schematic embodiment of the invention is described below with reference to a figure which shows the device in vertical section.
Wege zur Ausführung der ErfindungWays of Carrying Out the Invention
Die Figur zeigt eine Vorrichtung zur Ermittlung des Druckver¬ laufes in der Brennkammer eines Verbrennungsmotors, insbeson¬ dere eines Grossdieselmotors. In einer Öffnung in der Wand 1 einer Brennkammer 10 eines solchen Verbrennungsmotors ist ein topfartiges Gehäuse 2 der erfindungsgemässen Vorrichtung eingesetzt. Im Boden des Gehäuses 2 ist eine Öffnung 3 vorhan¬ den, in der ein Faltenbalg 4 mediumsdicht angeordnet ist. Am inneren Ende des Faltenbalges 4 trägt dieser einen Geber 5, wobei die Verbindung ebenfalls mediumsdicht ist. Der Geber 5 ist biegesteif ausgestaltet und stützt sich auf einem als Druck/Weg-Wandler wirkenden Federelement 6 ab, das vorzugswei¬ se als Tellerfeder ausgebildet ist. Das Federelement 6 stützt sich auf einem Gehäuseteil 7 ab. Entsprechend einem zu messen- den Druckbereich können Federelemente 6 mit gleichen Einbauab¬ mes sungen aber unterschiedlichen Federkennlinien eingesetzt werden . In diesem Falle iεt die Federkonstante des Federele¬ mentes wesentlich grosser als die Federkonstante des medium¬ trennenden Gebers , sodass dessen Federkonstante die Druck/Weg- Wandlung praktisch nicht beeinflusst .The figure shows a device for determining the pressure curve in the combustion chamber of an internal combustion engine, in particular a large diesel engine. A pot-like housing 2 of the device according to the invention is inserted in an opening in the wall 1 of a combustion chamber 10 of such an internal combustion engine. In the bottom of the housing 2 there is an opening 3 in which a bellows 4 is arranged in a medium-tight manner. At the inner end of the bellows 4, this carries a transmitter 5, the connection also being medium-tight. The transmitter 5 is designed to be rigid and is supported on a spring element 6 which acts as a pressure / displacement transducer and is preferably designed as a plate spring. The spring element 6 is supported on a housing part 7. According to a measure- In the pressure range, spring elements 6 with the same installation dimensions but different spring characteristics can be used. In this case, the spring constant of the spring element is substantially larger than the spring constant of the medium-separating sensor, so that its spring constant practically does not influence the pressure / displacement conversion.
Die der Öffnung 3 abgewandte Seite 5 ' des Gebers ist lichtref¬ lektierend ausgebildet und steht einem zuführenden Lichtleiter 8 und einem abführenden Lichtleiter 9 gegenüber , die analog der EP-A-0 208 545 mit einer entsprechenden , hier nicht näher dargestel lten Auswerteinheit verbunden sind . Durch diese Ausbildung wird eine durch das zu überwachende Medium verur¬ sachte axiale Auslenkung des Gebers in entsprechende Schwan¬ kungen des ref lektierten Lichtes umgewandelt , wobei diese Lichtschwankungen in einem entsprechenden Auswertgerät in elektrische Signale umgesetzt werden können . The side 5 'of the transmitter facing away from the opening 3 is designed to be light-reflecting and faces a feeding light guide 8 and a discharging light guide 9, which, like EP-A-0 208 545, are connected to a corresponding evaluation unit (not shown here) . This configuration converts an axial deflection of the transmitter caused by the medium to be monitored into corresponding fluctuations in the reflected light, it being possible for these light fluctuations to be converted into electrical signals in a corresponding evaluation device.
BEZUGSZEICHENLISTEREFERENCE SIGN LIST
1 Wand1 wall
2 Gehäuse2 housings
3 Öffnung3 opening
4 Faltenbalg4 bellows
5 Geber5 donors
5 ' reflektierende Geberseite5 'reflective sensor side
6 Federelement6 spring element
7 Gehäuseteil7 housing part
8 zuführender Lichtleiter8 feeding light guides
9 abführender Lichtleiter9 laxative light guide
10 Brennkammer 10 combustion chamber

Claims

PATENTANSPRÜCHEPATENT CLAIMS
1) Vorrichtung zur Ermittlung des Druckverlaufes in der Brennkammer eines Verbrennungsmotors, insbesondere eines Grossdieselmotors, mit einem in einem Gehäuse (2) federnd angeordneten auf Druck ansprechenden Geber (5), der auf einer Seite dem zu überwachenden Medium angesetzt ist und der auf der anderen Seite (5') reflektierend ausgebildet ist und einem zuführenden Lichtleiter (8) und einem abführenden Lichtleiter (9) gegenübersteht, die mit einem Auswertteil in Verbindung stehen, dadurch gekennzeichnet, dass das Gehäuse (2) einen Boden mit einer Durchgangsöff¬ nung (3) aufweist, über der ein Faltenbalg (4) medium¬ dicht angeordnet ist, der im Gehäuse (2) mittels des Gebers (5) mediumdicht abgeschlossen ist, wobei sich der Geber (5) mittels eines Federelementes (6) dem Mediums¬ druck entgegenwirkend im Inneren (7) des Gehäuses (2) abstützt.1) Device for determining the pressure curve in the combustion chamber of an internal combustion engine, in particular a large diesel engine, with a pressure-sensitive sensor (5) arranged in a housing (2), which is attached to the medium to be monitored on one side and on the other Side (5 ') is designed to be reflective and opposes an incoming light guide (8) and an outgoing light guide (9), which are connected to an evaluation part, characterized in that the housing (2) has a bottom with a through opening (3 ), over which a bellows (4) is arranged in a medium-tight manner, which is sealed in a medium-tight manner in the housing (2) by means of the sensor (5), the sensor (5) counteracting the medium pressure by means of a spring element (6) in the interior (7) of the housing (2).
2) Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Federelement (6) als zylindrische Schraubenfeder oder Kegelfeder ausgebildet ist.2) Device according to claim 1, characterized in that the spring element (6) is designed as a cylindrical coil spring or conical spring.
Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Federelement (6) als Tellerfeder ausgebildet ist. Apparatus according to claim 1, characterized in that the spring element (6) is designed as a plate spring.
PCT/CH1997/000026 1996-02-02 1997-01-29 Device for determining changes in pressure in the combustion chamber of an internal-combustion engine WO1997028430A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00276/96A CH690935A5 (en) 1996-02-02 1996-02-02 Probe for pressure.
CH276/96 1996-02-02

Publications (1)

Publication Number Publication Date
WO1997028430A1 true WO1997028430A1 (en) 1997-08-07

Family

ID=4183309

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1997/000026 WO1997028430A1 (en) 1996-02-02 1997-01-29 Device for determining changes in pressure in the combustion chamber of an internal-combustion engine

Country Status (2)

Country Link
CH (1) CH690935A5 (en)
WO (1) WO1997028430A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013213991A1 (en) * 2013-07-17 2015-01-22 Continental Teves Ag & Co. Ohg Reflector module and use of the reflector module

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4461180A (en) * 1981-01-27 1984-07-24 Appareillages Et Materiels De Servitudes (A.M.S.) Apparatus for protecting differential pressure measurement apparatus against exceeding a maximum allowable differential pressure
US4703174A (en) * 1984-03-02 1987-10-27 Fiberdynamics, Inc. Fiberoptic temperature/pressure sensor system
US5065010A (en) * 1990-08-30 1991-11-12 Camino Laboratories Fiber optic measurement system having a reference conductor for controlling the energy level of the light source

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4265252A (en) * 1978-04-19 1981-05-05 The Johns Hopkins University Intracranial pressure implant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4461180A (en) * 1981-01-27 1984-07-24 Appareillages Et Materiels De Servitudes (A.M.S.) Apparatus for protecting differential pressure measurement apparatus against exceeding a maximum allowable differential pressure
US4703174A (en) * 1984-03-02 1987-10-27 Fiberdynamics, Inc. Fiberoptic temperature/pressure sensor system
US5065010A (en) * 1990-08-30 1991-11-12 Camino Laboratories Fiber optic measurement system having a reference conductor for controlling the energy level of the light source

Also Published As

Publication number Publication date
CH690935A5 (en) 2001-02-28

Similar Documents

Publication Publication Date Title
DE102013105363A1 (en) Vortex flow sensor and vortex flow sensor for measuring the flow rate of a fluid
EP2413009B1 (en) Process valve with force measuring device
DE10312491B3 (en) Pressure sensor with heat shield for use in internal combustion engines
DE202009008088U1 (en) Mechanical seal with pressure-protected monitoring device
EP1219942B1 (en) Pressure indicator
DE102013013476A1 (en) Vortex flow sensor and vortex flow sensor for measuring the flow rate of a fluid
WO1998044318A1 (en) Compact ultrasonic flowmeter
EP0259471A1 (en) Device for checking and/or acquiring the dimensions, changes in dimension, the positon and changes in position of workpieces, regulating elements and the similar.
DE112008000258B4 (en) Differential Pressure Sensor
GB1591690A (en) Flowmeters
DE102013218479A1 (en) Device for detecting at least one property of a fluid medium
WO1997028430A1 (en) Device for determining changes in pressure in the combustion chamber of an internal-combustion engine
DE2949670A1 (en) DEVICE FOR MEASURING DYNAMIC PRESSURES
DE69529604T2 (en) IMPROVEMENTS ONE OR CONSISTENT OF A CONSISTENT TRANSMITTER
DE202011051374U1 (en) hitch
DE19545091B4 (en) Measuring instrument with a pressure transducer
WO2002077597A1 (en) Pressure sensor
EP0701110A2 (en) Capacitive probe for monitoring fluid in a tank
EP0129741B1 (en) Precision calliper
DE102014015889A1 (en) Stellarmatur comprising a sealing arrangement
DE102005043688B4 (en) Device for measuring a pressure within a combustion chamber of an internal combustion engine
DE19853309C2 (en) Cylinder-piston unit
DE102018105182A1 (en) Chamber candle with piezo pressure sensor
EP2274586B1 (en) Device for measuring a pressure differential
EP2087334A1 (en) Pressure sensor with integrated test device and method for testing such a sensor

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN JP KR NO PL RU SG US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 97527212

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase