EP0869278B1 - Soupape à injection avec moyens de compensation de la dilatation thermique d'un organe d'actionnement piézoélectrique - Google Patents

Soupape à injection avec moyens de compensation de la dilatation thermique d'un organe d'actionnement piézoélectrique Download PDF

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Publication number
EP0869278B1
EP0869278B1 EP98106153A EP98106153A EP0869278B1 EP 0869278 B1 EP0869278 B1 EP 0869278B1 EP 98106153 A EP98106153 A EP 98106153A EP 98106153 A EP98106153 A EP 98106153A EP 0869278 B1 EP0869278 B1 EP 0869278B1
Authority
EP
European Patent Office
Prior art keywords
actuator
thermal expansion
piezoelectric
housing
piezoelectric actuator
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.)
Revoked
Application number
EP98106153A
Other languages
German (de)
English (en)
Other versions
EP0869278A1 (fr
Inventor
Johannes Fitzner
Karl Kirchweger
Gerd Dr. Schmutzler
Raimondo Dr. Giavi
Jürgen Rink
Günter LEWENTZ
Stefan Lehmann
Dirk Dr. Baranowski
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.)
Continental Automotive GmbH
Original Assignee
Siemens 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
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Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0869278A1 publication Critical patent/EP0869278A1/fr
Application granted granted Critical
Publication of EP0869278B1 publication Critical patent/EP0869278B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion

Definitions

  • the invention relates to an injection valve with a piezoelectric Actuator and an actuator housing according to the preamble of claim 1.
  • An injection valve with a piezoelectric actuator is used to control an injection needle for injecting Fuel used in an internal combustion engine.
  • US-A-4 284 263 is an injector with a controllable actuator known, which is mounted in an actuator housing which is firmly connected to a valve housing, which is operatively connected to a valve closing body and the valve closing body controls the injection of fuel, whereby, the material of the actuator housing has a thermal Expansion quotient that is almost equal to the thermal Expansion quotient of the piezoelectric actuator is.
  • the object of the invention is a thermal change in length of an actuator without compensating for a damping chamber.
  • a major advantage of the invention is based in that the actuator housing in relation to the thermal Expansion coefficient is adapted to the piezoelectric actuator.
  • FIG. 1 shows schematically a known injection valve 1 with a valve housing 19, in which a housing recess 7 is introduced which merges into a guide bore 20 which in an injection chamber 26 opens.
  • the guide bore 20 is on a fuel channel 6 connected via the fuel is fed.
  • An actuator housing is in the housing recess 7 8 introduced that over two flanges 12 and screws 11 firmly connected to the top of the valve housing 19 is.
  • an adjustment plate 13 is introduced between the flanges 12 and the top of the valve housing 19, an adjustment plate 13 is introduced.
  • the adjustment plate 13 sets the insertion depth of the actuator housing 8 firmly in the valve housing 19. This way the distance between the base plate 21 of the housing 8 and the bottom of the bore 22 of the housing recess 7 set.
  • the actuator housing 8 is designed as a hollow cylinder on the underside of the base plate 21 is limited.
  • the Base plate 21 is opposite a cover plate 9 on the Screwed on actuator housing 8 using fastening screws 10.
  • the actuator housing 8 there are two one behind the other in the longitudinal direction arranged piezoelectric actuators 2, the upper piezoelectric actuator 2 abuts the cover plate 9.
  • the piezoelectric actuators 2 are via control lines 17 connected to a control means 16.
  • only one piezoelectric actuator 2 is provided.
  • the lower piezoelectric actuator 2 is operated by an actuator 3 held by a spring 14 against the lower piezoelectric Actuator 2 is cocked. That way they are piezoelectric actuators 2 biased against the cover plate 9.
  • the actuator 3 goes from a holding plate in the the piezoelectric actuator 2 is mounted in a control rod 23 over that through an opening of the bottom plate 21 in the guide bore 20 is guided and on the injection needle 4 is present.
  • the injection needle 4 is in the rest position of one Tension spring 25 biased against the control rod 23, wherein the injection needle 4 seals an associated sealing seat 18. As a result, the injection chamber 26 is off the fuel supply line 6 separated.
  • the operation of the injection valve 1 is as follows explained in more detail: In the rest position, the piezo actuator 2 not controlled by the control means 16 and thus by the spring 14 biased against the cover plate 9.
  • the injection needle 4 is also from the tension spring 25 to the sealing seat 18th and pressed against the control rod 23. There is no Injection since the fuel line 6 from the injection chamber 26 is separated.
  • the control means 16 controls the piezoelectric ones for an injection Actuators 2 so that they expand and the actuator 3 in the direction of the injection needle 4th move against the spring force of the spring 14 and the tension spring 25.
  • the injection needle 4 is lifted from the sealing seat 18 and the fuel supply line 6 with the injection chamber 26 connected. As a result, the nozzle openings 5 Dispensed fuel.
  • the injection process is ended by the control means 16 by the control of the piezoelectric actuator 2 canceled is so that the piezoelectric actuator 2 contracts and the actuator 3 from the spring 14 towards the cover plate 9 is pushed.
  • the actuator housing 8 is adjusted by the adjustment plates 13 in such a way that in the rest position, the injection needle 4 on the assigned sealing seat 18 and the injection needle 4th when the piezoelectric actuator 2 is actuated by the associated one Sealing seat 18 is lifted off.
  • the piezoelectric heats up Actuator 2, the piezoelectric actuator 2 pulls together because the thermal expansion coefficient of the piezoelectric Material has a negative coefficient of thermal expansion having.
  • the actuator 3 from the spring 14 in the direction of the base plate 9 moved so that the nozzle needle 4 with high force on the Sealing seat 18 is pressed. This has the consequence that a bracing and thus a misalignment of the actuator 2 in relation on the injection needle 4, so that a safe opening and closing the nozzle opening 5 no longer guaranteed is.
  • FIG. 2 shows a further development of the invention, which consists in that between the piezoelectric actuator 2 and the Cover plate 9 arranged at least one shim 15 is.
  • the shim 15 is made of a material that its thickness changes depending on the temperature.
  • Appropriate Materials include memory alloys, those made of nickel-titanium or copper-zinc-aluminum alloys consist.
  • Draw memory alloys is characterized by the fact that in a temperature interval of approx. 10 K the volume and thus the thickness by an adjustable Change value.
  • the shim 15 is preferably made of a material that has a coefficient of thermal expansion of 12-16 • 10 -6 l / K. Corresponding materials are, for example, steel or chrome alloys. As a result, the lower coefficient of thermal expansion of the actuator 2 is compensated for compared to the actuator housing 8.
  • the arrangement according to Figure 2 works as follows: warmed the injection valve 1, the actuator housing expands 8 off and the piezoelectric actuator 2 contracts. This would cause the piezoelectric actuator 2 and the cover plate 9 a gap arise.
  • shims 15 which are chosen accordingly Temperatures will increase the volume prevents a gap from forming. In this way are different coefficients of thermal expansion between the piezoelectric actuator 2 and the actuator housing 8 balanced.
  • the shims 15 are in relation to the Alloy corresponding to the difference between the thermal Expansion coefficient of the piezoelectric actuator 2 and the coefficient of thermal expansion of the housing 9 is formed.
  • Figure 3 shows the deformation V, i.e. the veining, in Dependence on the temperature T of a copper-zinc-aluminum alloy, those with a heating from an austenite start temperature deformed and larger volume by Reaching the austenite end temperature. Will the same alloy based on the austenite end temperature cooled down, one begins at a martensite temperature Decrease in volume at a martensite end temperature ends.
  • a stack of several shims is advantageous 15 provided at different temperatures make a change in volume. This will achieves that the stack decreases with increasing temperature Length of the piezoelectric actuator 2 by a corresponding one Compensates for an increase in thickness. Through several Shims 15 will be uniform, over the temperature range distributed compensation of the change in length of the piezoelectric actuator 2 reached.
  • the shims 15 are preferably provided with a corresponding one Adaptation of the thermal expansion coefficient of the housing 8, the actuator 3 according to the figures 1 and 2 combined.
  • Figure 4 shows the thickness D of a stack consisting of five shims 15 exists, depending on the temperature T.
  • the thickness D of the stack increases given five Temperatures T1, T2, T3, T4 and T5 each within one small temperature difference of 10 ° Kelvin by a specifiable Value too. This way an almost linear change reached the thickness of the stack and thus a corresponding one Shortened the piezoelectric actuator 2 compensated.
  • the memory alloys have a high tensile strength and a high allowable stress so that the rigidity of the Connection between the piezoelectric actuator 2 and the Cover plate 9 is guaranteed.
  • the advantage of memory alloys is that a large volume capacity per Unit of volume and a full job in a small temperature interval of approx. 10 ° K is reached.
  • Memory alloys are, for example, in "actuators with shape memory alloys", by P. Schmidt-Mende.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (2)

  1. Injecteur comprenant un actionneur (2) pouvant être commandé,
    qui est logé dans un boítier d'actionneur (8) qui est relié rigidement à un boítier d'injecteur (19),
    qui est en liaison effective avec l'aiguille d'injecteur (4) et commande l'aiguille d'injecteur (4) pour l'injection de carburant, caractérisé
    en ce que l'actionneur (2) agit sur l'aiguille d'injecteur (4), par l'intermédiaire d'un dispositif de réglage (3, 23) pour la commande d'un processus d'injection, en ce que le dispositif de réglage (3, 23) est en liaison avec le boítier (8) de l'actionneur par l'intermédiaire de l'actionneur piézoélectrique (2) et par l'intermédiaire d'un disque de compensation (15), et en ce que le disque de compensation (15) possède un coefficient de dilatation thermique qui compense une variation de longueur thermique de l'actionneur piézoélectrique (2), le disque de compensation (15) étant constitué, au moins en partie d'un métal à mémoire et le métal à mémoire variant de volume dans un intervalle de température prédéterminé.
  2. Injecteur selon la revendication 1, caractérisé en ce qu'il présente plusieurs disques de compensation (15) qui sont composés d'alliages différents dont les intervalles de température dans lesquels il se produit une variation du volume sont choisis de manière qu'une variation thermique de la longueur de l'actionneur (2) soit compensée de façon que la longueur totale qui résulte de la longueur de l'actionneur (2) et de l'épaisseur des disques de compensation (15) reste sensiblement constante.
EP98106153A 1997-04-04 1998-04-03 Soupape à injection avec moyens de compensation de la dilatation thermique d'un organe d'actionnement piézoélectrique Revoked EP0869278B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19713982 1997-04-04
DE19713982 1997-04-04

Publications (2)

Publication Number Publication Date
EP0869278A1 EP0869278A1 (fr) 1998-10-07
EP0869278B1 true EP0869278B1 (fr) 2004-03-24

Family

ID=7825473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98106153A Revoked EP0869278B1 (fr) 1997-04-04 1998-04-03 Soupape à injection avec moyens de compensation de la dilatation thermique d'un organe d'actionnement piézoélectrique

Country Status (2)

Country Link
EP (1) EP0869278B1 (fr)
DE (1) DE59811027D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101711407B (zh) * 2007-06-07 2013-01-16 斯科特科技公司 个人警报安全系统的发声器组件

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DE19826341A1 (de) * 1998-06-12 1999-12-16 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE19849203A1 (de) 1998-10-26 2000-04-27 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19909106C2 (de) * 1999-03-02 2001-08-23 Siemens Ag Temperaturkompensierte piezoelektrische Aktoreinheit
DE19921242C1 (de) * 1999-05-07 2000-10-26 Siemens Ag Verfahren zum Positionieren des Stellantriebs in einem Kraftstoffinjektor und Vorrichtung zur Durchführung des Verfahrens
DE19928185B4 (de) * 1999-06-19 2006-05-24 Robert Bosch Gmbh Piezoaktor
DE19928179B4 (de) * 1999-06-19 2008-07-31 Robert Bosch Gmbh Piezoaktor
DE19928204A1 (de) * 1999-06-19 2000-12-21 Bosch Gmbh Robert Brennstoffeinspritzventil
JP2003507679A (ja) * 1999-08-20 2003-02-25 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 液体を制御するための弁
DE19946869A1 (de) 1999-09-30 2001-04-05 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19946839B4 (de) * 1999-09-30 2006-07-27 Robert Bosch Gmbh Verstelleinrichtung zum Ansteuern einer Regel- und/oder Absperrvorrichtung
DE19948359A1 (de) * 1999-10-07 2001-01-11 Siemens Ag Aktoreinheit mit Keramikelement zur Temperaturkompensation
US6575138B2 (en) 1999-10-15 2003-06-10 Westport Research Inc. Directly actuated injection valve
EP1473460B1 (fr) * 1999-10-15 2007-09-12 Westport Power Inc. Injecteur actionné directement
US6564777B2 (en) 1999-10-15 2003-05-20 Westport Research Inc. Directly actuated injection valve with a composite needle
US6298829B1 (en) * 1999-10-15 2001-10-09 Westport Research Inc. Directly actuated injection valve
US6584958B2 (en) 1999-10-15 2003-07-01 Westport Research Inc. Directly actuated injection valve with a ferromagnetic needle
DE19950762A1 (de) 1999-10-21 2001-04-26 Bosch Gmbh Robert Brennstoffeinspritzventil
US6313568B1 (en) * 1999-12-01 2001-11-06 Cummins Inc. Piezoelectric actuator and valve assembly with thermal expansion compensation
DE10003863B4 (de) * 2000-01-28 2004-11-18 Robert Bosch Gmbh Einspritzdüse
DE10037743A1 (de) * 2000-08-02 2002-02-21 Siemens Ag Piezo-Aktuator
DE10040239B4 (de) * 2000-08-17 2009-04-02 Continental Automotive Gmbh Geräuschgedämpfte Aktoreinheit
EP1325226B1 (fr) 2000-10-11 2006-12-20 Siemens VDO Automotive Corporation Ensemble compensateur muni d'un diaphragme souple et d'un tube de remplissage interne, destine a un injecteur de carburant et procede correspondant
US6991187B2 (en) 2000-11-13 2006-01-31 Siemens Automotive Corporation Magneto-hydraulic compensator for a fuel injector
DE10149915A1 (de) * 2001-10-10 2003-04-24 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10149914A1 (de) 2001-10-10 2003-04-24 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10153630A1 (de) * 2001-10-31 2003-07-10 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10204655A1 (de) * 2002-02-05 2003-08-28 Bosch Gmbh Robert Brennstoffeinspritzventil
US6749127B2 (en) 2002-02-11 2004-06-15 Siemens Vdo Automotive Corporation Method of filling fluid in a thermal compensator
DE10308915A1 (de) * 2003-02-28 2004-09-09 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1664525B1 (fr) * 2003-09-12 2008-04-23 Siemens Aktiengesellschaft Dispositif de dosage
DE10345203A1 (de) * 2003-09-29 2005-05-04 Bosch Gmbh Robert Brennstoffeinspritzventil
DE102004001679B4 (de) 2004-01-12 2009-01-08 Continental Automotive Gmbh Piezoaktor mit Mitteln zur Kompensation der thermischen Längenänderung und Kraftstoff-Einspritzventil mit Piezoaktor
DE102004030606B4 (de) * 2004-06-24 2006-07-13 Siemens Ag Piezoelektrischer Stellantrieb für einen Kraftstoffinjektor einer Brennkraftmaschine
DE102004034520B4 (de) * 2004-07-16 2006-11-02 Siemens Ag Piezobetriebener Aktor
DE102004041171B3 (de) * 2004-08-25 2006-01-19 Siemens Ag Verfahren und Vorrichtung zur Bewertung des Temperaturverhaltens eines piezoelektrischen Aktors in einem Kraftstoffinjektor
DE102005040365A1 (de) * 2005-08-26 2007-03-01 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Nadelsteuerung
DE102007033033B4 (de) 2007-07-16 2019-08-08 Continental Automotive Gmbh Aktoreinheit für ein Einspritzsystem einer Brennkraftmaschine
DE102008060518A1 (de) * 2008-12-04 2010-07-15 Continental Automotive Gmbh Einspritzventil
FI122437B (fi) * 2009-05-28 2012-01-31 Waertsilae Finland Oy Polttoaineen ruiskutusventtiili
DE102019120684A1 (de) * 2019-07-31 2021-02-04 Vega Grieshaber Kg Antriebseinheit für einen Vibrationssensor und Vibrationssensor mit einer solchen Antriebseinheit
EP3808653A1 (fr) * 2019-10-18 2021-04-21 Claverham Limited Actionneurs linéaires

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CN101711407B (zh) * 2007-06-07 2013-01-16 斯科特科技公司 个人警报安全系统的发声器组件

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Publication number Publication date
EP0869278A1 (fr) 1998-10-07
DE59811027D1 (de) 2004-04-29

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