EP2223066A2 - Composant pour mesurer une force ou une pression et capteur comprenant un tel composant - Google Patents

Composant pour mesurer une force ou une pression et capteur comprenant un tel composant

Info

Publication number
EP2223066A2
EP2223066A2 EP08854262A EP08854262A EP2223066A2 EP 2223066 A2 EP2223066 A2 EP 2223066A2 EP 08854262 A EP08854262 A EP 08854262A EP 08854262 A EP08854262 A EP 08854262A EP 2223066 A2 EP2223066 A2 EP 2223066A2
Authority
EP
European Patent Office
Prior art keywords
component
component according
glow plug
measuring element
sensor
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Withdrawn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
EP08854262A
Other languages
German (de)
English (en)
Inventor
Michael Müller
Andrea Bertola
Kay Unzicker
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.)
Kistler Holding AG
Original Assignee
Kistler Holding AG
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 Kistler Holding AG filed Critical Kistler Holding AG
Publication of EP2223066A2 publication Critical patent/EP2223066A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
    • G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • G01L23/222—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines using piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • 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
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/008—Transmitting or indicating the displacement of flexible diaphragms using piezoelectric devices
    • 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
    • G01L9/08—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 by making use of piezoelectric devices, i.e. electric circuits therefor

Definitions

  • the invention relates to a component for installation in force or pressure sensors comprising a measuring element of piezoelectric material according to the preamble of the main claim and a sensor comprising such a component.
  • Sensors comprising such components are used, for example, for measuring in combustion chambers, for example in glow plugs.
  • WO 2006/089446 a component of the type described above is known. It is particularly suitable to be used in glow plugs. However, this component must either have insulated lines to the electrodes, or their isolation from each other must be achieved with a complex part that engages in the component. These measures are very expensive.
  • WO 2007/096205 describes a glow plug which can use, for example, a component as described in WO 2006/089446. It comprises a centering element with a centering section which is intended to center the component in the glow plug. The difficulty, however, is to produce this centering section and the surface on which the component adjoins, in the required flatness, in order to perform the centering. Presentation of the invention
  • Object of the present invention is to provide a component for installation in force or pressure sensors of the type mentioned, which is constructed such that a centered installation in a sensor moglxch without further centering parts.
  • Another object of the invention is to provide a component which does not require any expensive parts to insulate the leads for the electrodes.
  • the component according to the invention comprises a measuring element made of piezoelectric material, on both sides of which an electrode with lines attached thereto, as well as a transmission body adjacent to the first electrode, as well as an insulating body adjacent to the second electrode.
  • the Ubertragungskorper and Isolationskorper are electrically insulating. All these components are centered to each other fixed to a component.
  • the idea underlying the invention is that the outer surfaces of the component with respect to its axis have a flatness of less than 10 ⁇ m. This allows the component positioned on these surfaces to be installed in a sensor without the need for additional components for centering. As a result, additional components can be saved, which, apart from the cost advantages, also saves space. Thus, sensors can be made smaller.
  • a particular further embodiment of the component according to the invention consists in that the insulating body has at least two bores in which the cables pass through each other in isolation through the insulating body. As a result, they can not touch and are always electrically isolated from each other.
  • Figure 1 is a schematic representation of a preferred arrangement of a glow plug according to the invention, in cross section.
  • FIG. 2 is a schematic representation of a detail of a preferred glow plug in cross section, in the region of the inventive component.
  • 3 is a schematic representation of the inventive component with a Glühstromdraht.
  • Fig. 4 is a schematic representation of the insulating part in side view.
  • Fig. 1 shows a possible embodiment as an application of an inventive component 2 in a glow plug 1.
  • the figure shows in a cross section a schematic representation of a preferred glow plug 1.
  • This includes a housing 24, in the front region of a glow plug 20 is inserted, which protrudes from this.
  • a power transmission sleeve 21 may be located, behind which the inventive component 2 is arranged.
  • the component 2 may also be arranged directly behind the glow plug.
  • Behind this component 2 is a fixation 22, which bears against a connecting element 23 at the rear.
  • the connecting element 23 is attached at its rear end to a shoulder 25 of the housing 24.
  • Alternative constructions with the same effects are also possible.
  • the fixing 22 may be welded to the housing 24 at a welding point 30, whereby no force is transmitted via the connecting element 23 on the shoulder 25 of the housing 24.
  • a pressure in the combustion chamber acts via the glow plug 20 directly or via the power transmission sleeve 21 on the component 2, which converts the pressure into a measurement signal.
  • This measuring signal is finally conducted via two lines 10, 10 'from the component 2 via a wiring 26 to an evaluation device (not shown).
  • the housing 24 For mounting the glow plug 1 in a designated hole of a cylinder head, the housing 24 usually has a thread 27 and a hexagon 28 as an attack surface for a tool.
  • the welding point 30 is arranged in this case in the region between the thread 27 and the glow plug 20.
  • the welding point 30 may preferably be attached to an intermediate sleeve, not shown, instead of the housing 24. be brought, which applies the bias and is separated from the housing 24, apart from their attachment thereto.
  • the glow plug 1 In the rearmost area of the glow plug 1 is the output for the wiring 26, which apart from the lines 10, 10 'for the .Bauteil 2, the power supply for a Glühstromdraht 31, which is provided for the heating of the glow plug 20 includes.
  • a diaphragm 29 In the front region of the glow plug 1 is a diaphragm 29, which seals the interior of the housing 24 from the combustion chamber. By means of this membrane 29 and a desired bias voltage can be brought to the component 2.
  • At least a portion of the power transmission sleeve 21 is made of heat-insulating material, so that the component 2 is less exposed to the heat load from the combustion chamber.
  • FIG. 2 shows a detailed section of FIG. 1 in the region of the component 2.
  • the various components of the component 2 have substantially the same outer diameter.
  • a measuring element 3 forms the core of the component 2. This consists of piezoelectric material, such as piezoelectric crystal or piezoelectric ceramic. This measuring element 3 is surrounded on both sides in the axial direction by a first electrode 4 and by a second electrode 4 '. At these electrodes 4, 4 ', the lines 10, 10' are attached to contact points 8. Adjacent to the first electrode 4 opposite to the measuring element 3, an electrically insulating transmission body 5 is attached, and adjacent to the second electrode 4 'opposite the measuring element 3, an electrically insulating insulating body 6 is attached. All of these components 3, 4, 4 ', 5 and 6 are centered fixed to one another to a component 2. This fixing attachment, for example, by a film or shrink tubing surrounding these components.
  • the component 2 is shown with the Glühstromdraht 31.
  • the combustion chamber side surfaces of the components are marked with a, the connector side surfaces with b.
  • the outer side of the transfer body 5a and the outer side of the insulating body 6b, which run away from the electrodes 4, 4 'parallel to these, are very flat with a flatness of less than 10 ⁇ m, preferably less than 5 ⁇ m. This allows a later simple, centered installation in a sensor. It has been found that the centering element used in WO 2007/096205 can be configured at its contact surface to the component 2 only with considerable effort in the required flatness. In addition, can be completely dispensed with the execution of centering and centering with correspondingly high accuracy. The design described here is thus much cheaper.
  • the inner surfaces of the component 2, which run parallel to these surfaces 5a, 6b, namely both sides of the measuring element 3a, 3b, both sides of both electrodes 4a, 4b, 4'a, 4'b and the inner side of the transmission body 5b and the inner side of the insulating body 6a are very plan designed with a flatness of less than lO ⁇ m.
  • the insulation body 6 at least two holes 9, 9 ', in which the lines 10, 10' isolated to each other through the insulation body 6 by.
  • a centering as described in WO 2007/096205, used whose function it was among other things to provide for the isolation of these lines 10, 10 '.
  • the two bores 9, 9 ' can also be connected to each other as long as the insulation of the lines 10, 10' extending therein is ensured. In particular, it may be segments of the same bore, as long as the lines 10, 10 'are mounted at a distance from each other.
  • the newly created space in the center of the transitional body 5 due to the omission of the centering body can now be used differently, for example for a heating coil.
  • the Ubertragungskorper 5 and 6 Isolationskorper fulfill other important functions. At least one of these bodies 5, 6 is preferably an expansion body that compensates for the thermal expansions of the housing 24.
  • the two bodies 5, 6 also fulfill the task of mechanically protecting the measuring element 3 with the electrodes 4, 4 'on both sides. They are pressed parts according to the invention, as a rule of ceramic, preferably of aluminum oxide.
  • At least the transfer body 5 is also a thermal insulator. This has the advantage that the component 2 attached behind is exposed to a lower temperature and thus has to meet lower requirements.
  • the electrodes serve to collect the charges which occur during pressure or force on both sides of the measuring element 3 and to forward them to the contact points 8 provided for this purpose.
  • These contact points 8 are preferably located in the inner region of the component 2. This is advantageous since, as a rule there is hardly any space on the outside between the component 2 and the housing 24 for the routing away of the lines.
  • Part 2 brought under bias, which is a later
  • Fig. 3 shows the component when it is penetrated by the Glühstromdraht 31. This is the case when it is installed in a glow plug.
  • the insulating body 6 has a further bore 9 '', through which the Glühstromdraht 31 can be performed.
  • This bore 9 '' preferably has a local taper 7, which can lead the Glühstromdraht 31 fed.
  • This taper 7 is preferably closer to the outside 6b than to the inside 6a of the insulating body 6.
  • the heat-affected zone is further away from the measuring element 3, whereby the temperature at this can be kept low.
  • the bore 9 '' with the taper 7 can also have a different geometric configuration.
  • this taper 7 or the bore 9 '' itself is preferably arranged eccentrically in the insulating body 6.
  • the position of the two holes 9, 9' uniquely determined. This is necessary for a machine connection of the lines 10, 10 'to the cabling provided for this purpose.
  • Such just described component 2 is specifically designed to be installed in a standard installation in pressure sensors for internal combustion engines, especially in glow plugs. This requires a simple, inexpensive construction and high process reliability for creating the high-precision flat surfaces.
  • the inventive embodiment of the component 2 described here is characterized mainly by its simplicity and the consequent cost-effective production, which can be automated.
  • all components of the component 2 are centered.
  • the attachment ensures the preservation of the centering until the component 2 is installed and biased in the sensor.
  • This arrangement is, in contrast to other components for the same applications in which one of the electrodes is connected to the housing, the component 2 also ground-isolated. This ground insulation is required by law in many countries for all components in an automobile.
  • the component 2 is arranged in the front region of the glow plug 1, which is in the installed state in the region of the glow plug bore of the cylinder head. Accordingly, the component 2 is preferably arranged in front of or in the region of the thread 27. This ensures on the one hand that this is not over 220 0 C warm because the cylinder head is cooled.
  • Another advantage of this mounting position is that the measurement error is lower, the closer the component 2 is to the pressure chamber, that is, to the combustion chamber.
  • Another advantage of the front mounting position of the component 2 is that thereby in the rear region of the glow plug, for example in the region of the connecting element 23, space for an integrated amplifier. As a result, an already amplified output signal can be forwarded through the wiring 26.
  • the installation of the component 2 in the front region requires, however, that the component 2 has an outer diameter of at most 5 mm in order to find 27 place in a glow plug 1 with an M8 thread.
  • the length of the component is typically between about 6 and 15 mm.

Landscapes

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

Abstract

L'invention concerne un composant (2) à monter dans des capteurs de force ou de pression. Ce composant comprend un élément de mesure (3) annulaire en matériau piézoélectrique, une première (4) et une seconde électrode (4') appliquées de chaque côté de l'élément de mesure (3) et pourvues de conducteurs (10, 10'), ainsi qu'un élément de transmission (5) électriquement isolant adjacent à la première électrode (4) en vis-à-vis de l'élément de mesure (3) et un élément d'isolation (6) électriquement isolant adjacent à la seconde électrode (4') en vis-à-vis de l'élément de mesure (3). Tous ces éléments (3, 4, 4', 5, 6) sont fixés dans le composant (2) de telle sorte qu'ils soient centrés les uns par rapport aux autres. Selon l'invention, le côté extérieur de l'élément de transmission (5a) et le côté extérieur de l'élément d'isolation (6b), qui s'étendent parallèlement aux électrodes (4, 4') à l'opposé de celles-ci, sont très plats et présentent une planéité inférieure à 10 μm.
EP08854262A 2007-11-26 2008-11-24 Composant pour mesurer une force ou une pression et capteur comprenant un tel composant Withdrawn EP2223066A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH18342007 2007-11-26
PCT/CH2008/000490 WO2009067833A2 (fr) 2007-11-26 2008-11-24 Composant pour mesurer une force ou une pression et capteur comprenant un tel composant

Publications (1)

Publication Number Publication Date
EP2223066A2 true EP2223066A2 (fr) 2010-09-01

Family

ID=39111857

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08854262A Withdrawn EP2223066A2 (fr) 2007-11-26 2008-11-24 Composant pour mesurer une force ou une pression et capteur comprenant un tel composant

Country Status (4)

Country Link
US (1) US8074502B2 (fr)
EP (1) EP2223066A2 (fr)
JP (1) JP5544297B2 (fr)
WO (1) WO2009067833A2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006008351A1 (de) * 2006-02-21 2007-08-23 Robert Bosch Gmbh Druckmesseinrichtung
DE102008017110B3 (de) * 2008-04-02 2009-09-10 Beru Ag Druckmessglühkerze
DE102008020509B4 (de) * 2008-04-23 2010-02-25 Beru Ag Verfahren zur Herstellung einer Vorrichtung zur Ermittlung des Brennraumdrucks und eine solche Vorrichtung
JP2011522263A (ja) * 2008-06-04 2011-07-28 キストラー ホールディング アクチエンゲゼルシャフト 内燃機関のチャンバ測定のための圧力センサ
DE102009026436A1 (de) * 2009-05-25 2010-12-09 Robert Bosch Gmbh Vorrichtung zur Erfassung eines Brennraumdrucks einer Brennkraftmaschine
DE102011078915A1 (de) 2011-07-11 2013-01-17 Robert Bosch Gmbh Sensoranordnung zur Kraft- oder Druckmessung sowie Kraftstoffinjektor mit einer solchen Sensoranordnung
DE102011078905A1 (de) 2011-07-11 2013-01-17 Robert Bosch Gmbh Sensoranordnung zur Kraft- oder Druckmessung sowie Kraftstoffinjektor mit einer solchen Sensoranordnung
DE102011078908A1 (de) 2011-07-11 2013-01-17 Robert Bosch Gmbh Sensoranordnung zur Kraft- oder Druckmessung sowie Kraftstoffinjektor mit einer solchen Sensoranordnung
DK3124945T3 (en) * 2015-07-31 2018-10-22 Kistler Holding Ag PIEZOELECTRIC PRESSURE SENSOR

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JPH04118643U (ja) * 1991-04-04 1992-10-23 日本特殊陶業株式会社 圧電センサー
JPH0518844A (ja) * 1991-07-11 1993-01-26 Nissan Motor Co Ltd 圧力センサ
US7493836B2 (en) * 2003-02-05 2009-02-24 Kistler Holding, Ag Measuring sensor comprising a pre-stressing device
JP2004278934A (ja) * 2003-03-17 2004-10-07 Ngk Spark Plug Co Ltd 燃焼圧検知機能付きグロープラグ
FR2861836B1 (fr) * 2003-10-29 2006-03-10 Siemens Vdo Automotive Bougie de prechauffage comprenant un capteur de pression et moteur ainsi equipe
DE102004002905B4 (de) * 2004-01-20 2006-05-18 Beru Ag Glühkerzenstecker
FR2869393B1 (fr) * 2004-04-27 2006-07-14 Siemens Vdo Automotive Sas Dispositif pour agir sur un capteur de pression monte sur une bougie de prechauffage
JP4903165B2 (ja) * 2005-02-24 2012-03-28 キストラー ホールディング アクチエンゲゼルシャフト 電気絶縁皮膜によって保持された圧電式力センサ用部品又は圧電式圧力センサ用部品
JP2006307834A (ja) * 2005-03-31 2006-11-09 Ngk Spark Plug Co Ltd 燃焼圧センサおよびそれを備えたグロープラグ
DE102006008639A1 (de) * 2005-12-23 2007-06-28 Robert Bosch Gmbh Glühstiftkerze
DE102006008350A1 (de) * 2006-02-21 2007-08-30 Robert Bosch Gmbh Druckmesseinrichtung
JP2008020176A (ja) * 2006-06-14 2008-01-31 Ngk Spark Plug Co Ltd センサ内蔵グロープラグ
JP4207070B2 (ja) * 2006-09-01 2009-01-14 株式会社デンソー 燃焼センサ付きグロープラグ
JP5161121B2 (ja) * 2008-03-28 2013-03-13 日本特殊陶業株式会社 グロープラグ

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Title
See references of WO2009067833A2 *

Also Published As

Publication number Publication date
US20100251808A1 (en) 2010-10-07
JP5544297B2 (ja) 2014-07-09
WO2009067833A2 (fr) 2009-06-04
WO2009067833A3 (fr) 2010-03-04
JP2011504587A (ja) 2011-02-10
US8074502B2 (en) 2011-12-13

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