EP0868645A1 - Procede et dispositif pour mesurer la distance ou le deplacement entre deux pieces d'une machine separees par un joint - Google Patents

Procede et dispositif pour mesurer la distance ou le deplacement entre deux pieces d'une machine separees par un joint

Info

Publication number
EP0868645A1
EP0868645A1 EP96943072A EP96943072A EP0868645A1 EP 0868645 A1 EP0868645 A1 EP 0868645A1 EP 96943072 A EP96943072 A EP 96943072A EP 96943072 A EP96943072 A EP 96943072A EP 0868645 A1 EP0868645 A1 EP 0868645A1
Authority
EP
European Patent Office
Prior art keywords
seal
capacitor
distance
movement
machine parts
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Withdrawn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
EP96943072A
Other languages
German (de)
English (en)
Inventor
Bernd Mahr
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.)
Forschungsinstitut fur Kraftfahrwesen und Fahrzeugmotoren Stuttgart
Original Assignee
Forschungsinstitut fur Kraftfahrwesen und Fahrzeugmotoren Stuttgart
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 Forschungsinstitut fur Kraftfahrwesen und Fahrzeugmotoren Stuttgart filed Critical Forschungsinstitut fur Kraftfahrwesen und Fahrzeugmotoren Stuttgart
Publication of EP0868645A1 publication Critical patent/EP0868645A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
    • G01D5/2417—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying separation
    • 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
    • F02F11/00—Arrangements of sealings in combustion engines 
    • F02F11/002—Arrangements of sealings in combustion engines  involving cylinder heads
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures

Definitions

  • the invention relates to a method and a device for measuring the distance or the movement between two machine parts separated by a seal of the type mentioned in the preamble of claim 1 or 6 and 8.
  • machine parts must be connected to one another in a sealed manner by means of a seal.
  • a typical example of this is the connection between the engine block and the cylinder head of an internal combustion engine, between which a cylinder head gasket is arranged.
  • the seal must, for example, seal the cooling water, the lubricating oil and the gases in the combustion chamber.
  • the seal must compensate for vertical and horizontal movements of the cylinder head relative to the engine block, despite the strong thermal stresses, and must adapt to machining inaccuracies of the surfaces sealed against one another.
  • the sealing and adaptation effect achieved is largely determined by the properties of the seal in connection with the contact pressure exerted on the seal by the machine parts.
  • the invention has for its object to provide a method and an apparatus of the type mentioned that a simple measurement of the distance or the movement of two machine parts separated by a seal with little effort and high useful signal strength with good signal noise -Distance allowed.
  • the sealing effect of the seal between the machine parts is in no way impaired, and the high pretensioning forces do not impair the signal-to-noise ratio of the useful signal.
  • the capacitor coatings are supplemented inside or outside the seal by a coil to form a resonant circuit, or the flat coils are supplemented outside of the seal to form a resonant circuit, so that the measurement of the distance or the movements can be carried out on the basis of a resonance frequency measurement of the resonant circuits thus formed.
  • capacitor coatings and / or the flat coil coils can be produced in a very simple manner using customary production techniques, since metal inserts are used in many areas in such seals anyway during production.
  • FIG. 1 shows a schematic view of a cylinder head / engine block combination with a seal arranged between these parts according to an embodiment of the invention
  • Fig. 5 shows a fifth embodiment of the seal according to the invention.
  • a seal 3 is arranged between the cylinder head 1, which is only shown schematically, and the engine block 4 of an internal combustion engine, the section of the seal shown here only serving to seal the combustion chamber and, of course, also in practice, for example Can extend over water and oil channels and seals them.
  • the seal 3 consists of a base body 5, for example in the form of a soft material seal with elastomer elements, the area of the seal surrounding the combustion chamber being provided with a metallic border 7. Such metallic enclosures can also be used on other sealing areas.
  • capacitor coverings are embedded in the seal at a plurality of locations, which together form a capacitor, the capacitance of which is evaluated.
  • the capacitor coatings are connected to the ends of an oscillating circuit, that the capacitance measurement is converted to a frequency measurement and that the influence of interference signals is significantly reduced.
  • FIG. 1 two different forms of embedding such capacitor coverings are shown as an example in the left and right halves of the illustration separated by a dash-dotted center line.
  • FIG. 1 Another embodiment is shown in the right half of FIG. 1, in which the metallic border 7, which is essentially C-shaped in cross section, is supplemented by a further capacitor covering 11 to form a capacitor, this capacitor covering being divided into the open end of the C-shaped skirt extends.
  • the change in the capacitance of the capacitor formed by the elements 7, 11 is a function of the distance d between the cylinder head 1 and the engine block 4. Therefore, for example, by the movements caused by the combustion pressure in the combustion chamber 6 of the engine are measured by measuring this capacitance, which, in addition to determining the operating behavior of the seal, also enables conclusions to be drawn about the course of combustion in the combustion chamber 6.
  • the measurement of the change in capacitance can also be used to determine misfires and combustion anomalies and enable a permanent diagnosis of the operating behavior of an internal combustion engine.
  • This evaluation can be used, for example, in an electronic motor control.
  • the capacity measurement can also be used in an advantageous manner when installing the seal to correctly select and check the tightening torques of the cylinder head screws (or other fastening means that pretension the two machine parts connected to one another via the seal).
  • the dielectric of the capacitor is formed by the sealing material itself.
  • connections a, b are shown in FIG. 1 as if they lead directly out of the motor.
  • connections a, b are shown in FIG. 1 as if they lead directly out of the motor.
  • inductance not shown
  • the inductance can either be embedded in the seal 3 or arranged in the evaluation electronics itself.
  • FIG. 2 shows a second embodiment of a seal which consists of two outer material layers 21, 22 and a spring-elastic layer 23 arranged between them, which forms a bead on certain sealing areas in order to achieve predetermined prestressing effects.
  • the resilient layer can in turn be embedded in a soft sealing material layer 20 or be arranged in an air gap. If the resilient layer consists of non-metallic material, capacitor layers 13, 14 can be arranged on this layer 23 on both sides of the bead, which capacitor forms a capacitor, the capacitance of which changes greatly when the bead is deformed. It should be pointed out that all the figures are not true to scale, but are shown in a highly distorted manner to improve clarity, so that, for example, the transverse Measurements of the bead and thus the distance between the capacitor coverings 13, 14 can be very small in practice.
  • the third embodiment according to FIG. 3 differs from that according to FIG. 2 in that capacitor coverings 13, 14 and 15 are arranged on both sides of the spring-elastic layer 23 in the region of the bead.
  • FIGS. 4 and 5 also have a spring-elastic insert layer 23 arranged between two outer sealing material layers 21, 22, but in which a half bead is arranged, in the area of which capacitor coatings 16, 17 and 18, 19 are in turn arranged.
  • these capacitor coverings 16, 17 are arranged on opposite surfaces of the insert layer 23 in the region of the half bead, while in FIG. 5 one cover 18 is arranged on the insert layer 23, while the other capacitor cover 19 is spaced apart of the capacitor covering 18 is arranged on the inside of one of the outer sealing material layers 22.
  • the insert layer 23 can also consist of metal.
  • capacitor coatings embedded in the seal have been dealt with above, it is understandable that, in the same way, in addition to the capacitor coatings or in their place, flat coils made of thin metal sheet or other material with their main plane parallel to the plane of the seal and can be embedded in this, preferably outside the seal by a
  • Capacity are added to a resonant circuit.
  • the inductance changes when the machine parts approach the flat coil, and this change in inductance can in turn be evaluated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Gasket Seals (AREA)

Abstract

L'invention concerne un procédé de mesure de la distance ou du mouvement entre deux pièces d'une machine séparées par un joint. Selon ce procédé, au moins un élément à impédance capacitif et/ou inductif est intégré dans le joint, lequel est constitué au moins en partie d'un matériau non métallique, de manière à créer une modification de la valeur d'impédance du ou des élément(s) à impédance lorsqu'il y a modification de la distance séparant les organes de machine. La modification de la valeur d'impédance est alors mesurée pour permettre la détermination de la distance ou du déplacement.
EP96943072A 1995-12-18 1996-12-10 Procede et dispositif pour mesurer la distance ou le deplacement entre deux pieces d'une machine separees par un joint Withdrawn EP0868645A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1995147313 DE19547313A1 (de) 1995-12-18 1995-12-18 Verfahren und Vorrichtung zur Messung des Abstandes bzw. der Bewegung zwischen zwei durch eine Dichtung getrennten Maschinenteilen
DE19547313 1995-12-18
PCT/EP1996/005512 WO1997022846A1 (fr) 1995-12-18 1996-12-10 Procede et dispositif pour mesurer la distance ou le deplacement entre deux pieces d'une machine separees par un joint

Publications (1)

Publication Number Publication Date
EP0868645A1 true EP0868645A1 (fr) 1998-10-07

Family

ID=7780491

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96943072A Withdrawn EP0868645A1 (fr) 1995-12-18 1996-12-10 Procede et dispositif pour mesurer la distance ou le deplacement entre deux pieces d'une machine separees par un joint

Country Status (3)

Country Link
EP (1) EP0868645A1 (fr)
DE (1) DE19547313A1 (fr)
WO (1) WO1997022846A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19913092C5 (de) 1999-03-23 2007-12-27 Reinz-Dichtungs-Gmbh Zylinderkopfdichtung
DE19948920C2 (de) * 1999-10-04 2001-09-27 Deutsch Zentr Luft & Raumfahrt Verfahren und Vorrichtung zur Justagekontrolle eines lösbar mit einem Kameragehäuse verbundenen Objektives
DE10001047B4 (de) * 2000-01-13 2011-01-05 Ksb Ag Einrichtung zur Bestimmung der axialen Rotorposition bei hermetisch dichten Antrieben
DE10054146C2 (de) * 2000-11-02 2003-03-20 Promos Technologies Inc Veränderlicher Kondensator zur Bestimmung des Abstands zwischen einem Heizer und einem Verteilerkopf

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5080156A (fr) * 1973-11-14 1975-06-30
US4160204A (en) * 1974-11-11 1979-07-03 Kaman Sciences Corporation Non-contact distance measurement system
FR2496871A1 (fr) * 1980-12-19 1982-06-25 Commissariat Energie Atomique Procede et dispositif de mesure de faibles distances entre deux pieces metalliques
JPS61137054A (ja) * 1984-12-07 1986-06-24 Toshiba Corp 回転機械の損傷監視装置
DE3516036A1 (de) * 1985-05-04 1986-11-06 Thyssen Industrie Ag, 4300 Essen Verfahren und vorrichtung zur sicheren bestimmung des abstandes eines magnetischen sensors von einer leitfaehigen reaktionsschiene
JPS62100602A (ja) * 1985-10-28 1987-05-11 Ishikawajima Harima Heavy Ind Co Ltd ベアリングギヤツプセンサ−
IT1211239B (it) * 1987-07-24 1989-10-12 Riv Officine Di Villar Perosa Complesso di tenuta per l interposizione tra due organi in rotazione relativa atto a permettere la rilevazione della velocita di rotazione relativa tra i medesimi e cuscinetto per il supporto della ruota di un veicolo provvisto del medesimo
DE3734715A1 (de) * 1987-10-14 1989-04-27 Ruediger Prof Dr Ing Haberland Kapazitiver abstandssensor
DE4015109A1 (de) * 1990-05-11 1991-11-14 Lechler Elring Dichtungswerke Zylinderkopfdichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9722846A1 *

Also Published As

Publication number Publication date
DE19547313A1 (de) 1997-06-19
WO1997022846A1 (fr) 1997-06-26

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