EP1445477B1 - Messvorrichtung mit Durchfluss-Kalibriereinrichtung sowie Verfahren zur Einstellung der Durchflussmenge der Messvorrichtung - Google Patents

Messvorrichtung mit Durchfluss-Kalibriereinrichtung sowie Verfahren zur Einstellung der Durchflussmenge der Messvorrichtung Download PDF

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Publication number
EP1445477B1
EP1445477B1 EP20030001633 EP03001633A EP1445477B1 EP 1445477 B1 EP1445477 B1 EP 1445477B1 EP 20030001633 EP20030001633 EP 20030001633 EP 03001633 A EP03001633 A EP 03001633A EP 1445477 B1 EP1445477 B1 EP 1445477B1
Authority
EP
European Patent Office
Prior art keywords
metering device
adjustment element
piezoelectric actuator
flow rate
valve needle
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.)
Expired - Fee Related
Application number
EP20030001633
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English (en)
French (fr)
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EP1445477A1 (de
Inventor
Angelo D'arrigo
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 Italy SpA
Original Assignee
Siemens VDO Automotive SpA
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 Siemens VDO Automotive SpA filed Critical Siemens VDO Automotive SpA
Priority to DE2003604442 priority Critical patent/DE60304442T2/de
Priority to EP20030001633 priority patent/EP1445477B1/de
Priority to JP2003301930A priority patent/JP2004225687A/ja
Publication of EP1445477A1 publication Critical patent/EP1445477A1/de
Application granted granted Critical
Publication of EP1445477B1 publication Critical patent/EP1445477B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • F02M61/161—Means for adjusting injection-valve lift
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • the present invention relates to a metering device for dosing pressurized fluids, particularly an injection valve for a fuel injection system in an internal combustion engine.
  • the metering device is of the type which comprises a housing having an end part provided with an outlet passage terminating with a metering opening, an axially moveable valve needle passing through the outlet passage and controlling opening and closing of the metering opening, and a piezoelectric actuator in axial alignment with the valve needle and cooperating with the valve needle to control its axial movement.
  • the invention further relates to a method for setting a flow rate of such a metering device.
  • EP 1 046 809 A2 discloses an injection valve of this type.
  • the flow rate delivered by the injector can be set to a defined value at the end of the assembly process in the factory.
  • the calibration of such an injector is carried out in a state where the injector is not completely assembled and welded.
  • the injector to be calibrated is introduced in an appropriate blocking tool.
  • the regulation of the flow rate through the injector is carried out by inserting one or more calibrated spacer rings in the valve spring blockage and repeatedly measuring the flow rate until a desired flow rate is reached.
  • the injector proceeds to the final welding of the inlet fitting on the housing.
  • the current process is also extremely complex, because several process variables such as the length and the elongation of the piezoelectric stack, the dimensional tolerances of the parts involved, and the chamber height of the thermal compensator have to be taken into account. Further, as the spacer rings have to be changed repeatedly, it is not possible to calibrate the injector during a flow phase of the fluid.
  • a major drawback of the current solution arises from the inability to adjust the flow of the injector after the completion of the whole assembly process.
  • the current type of flow adjustment is feasible only before the final welding of the housing and the valve body of the injector. Therefore, if it is found in the post calibration run that an injector does not meet the flow requirements, no further corrections are possible, and the injector has to be discarded.
  • DE 37 35 288 A1 discloses an electromagnetic fuel injection valve with a beam which is fixed to a valve upper part by laser welding.
  • the injection now further comprises a needle, which is preloaded into a closing position by a spring.
  • a coil is provided being part of an electromagnetic circuit exerting a force on the needle if a current is applied to the coil.
  • WO 01/90570 A1 discloses a fuel injector with a check valve member, which is hydraulically operated by respectively changing a pressure of a fuel.
  • a solid state motor is provided to lower a check stop, so that when fuel pressure in the nozzle chamber is raised the check valve member is limited to lift a much smaller distance.
  • US 6,385,848 B1 discloses a method of setting a distance between a first body and a second body in a fuel injector.
  • the method includes providing an intermediate body having a first end, a second end and a longitudinal axis, the first end being fixedly connected to the first body and a second end being fixedly connected to the second body.
  • the intermediate body is compressed towards the longitudinal axis. The compression axially elongates the intermediate body such that the first body is separated from the second body.
  • DE 199 32 762 A1 discloses an injection valve with a needle, that rests in a closing position on a seat, the seat being connected to a valve seat carrier.
  • the valve seat carrier is plastically deformed in order to change the lift of the needle.
  • a plastically deformed adjustment element is arranged axially aligned between a bottom end piece of the piezoelectric actuator and a head of the valve needle, wherein a plastic deformation of the adjustment element regulates the axial spacing between the piezoelectric actuator and the valve needle, thereby setting a flow rate for the metering device.
  • the invention is thus based on the idea to provide a deformable adjustment element in the metering device allowing for a flow rate calibration even after the metering device is completely assembled.
  • the adjustment element comprises a metal element shaped such that a radial compression of the element causes an axial elongation thereof.
  • the flow rate can then be set by driving two or more shaped punches radially inward through the housing of the metering device, thereby radially compressing and axially elongating the adjustment element.
  • the relative movement of the upper and lower face of the metal element is based on a controlled deformation of the metal element, the desired lift of the needle and thus the desired flow rate can be achieved.
  • the adjustment element has a first contact area for mounting the adjustment element to the bottom end piece of the piezoelectric actuator, a plastically deformable crimping area, the radial compression of which causes an axial elongation of the adjustment element, and a second contact area for contacting the head of the valve needle.
  • the first contact area of the adjustment element and the bottom end piece of the piezoelectric actuator comprise corresponding engagement means to mount the adjustment element to the piezoelectric actuator.
  • the second contact area of the adjustment element may advantageously comprise a hardened hemispherical head pin to provide good contact with the needle head.
  • the adjustment element is formed as a hollow frustroconical and biconical body with a central cylindrical area.
  • two or more through holes are provided in the housing of the metering device, which are radially aligned with a crimping area of the adjustment element.
  • the through holes provide access to the adjustment element and allowing plastic deformation thereof after the complete assembly of the metering device.
  • the flow rate through a completely assembled metering device is repeatedly measured and the adjustment element is gradually radially compressed until a predetermined flow rate through the metering device is achieved.
  • one or more punches are inserted in the through holes of the housing and driven inwardly, thereby inducing an axial adjustment of the spacing between the piezoelectric actuator and the valve needle.
  • the punch or the punches are driven inwardly by imposed strokes.
  • the punch or the punches may be driven inwardly by an imposed load.
  • FIG. 1 illustrates an injection valve 10 for direct-injection gasoline engines.
  • the injection valve 10 has a housing 12, whose lower part has an outlet passage 14 terminating with a metering opening 16.
  • the housing 12 contains a piezoelectric actuator 18.
  • An excitation voltage is applied to the piezoelectric actuator 18 to open the injection valve 10 and inject gasoline into the engine cylinder.
  • the piezoelectric actuator 18 increases in length in axial direction by a predetermined amount.
  • the length extension is transmitted to a valve needle 20 disposed in the outlet passage 14.
  • the needle 20 depresses a biasing spring and lifts from its seat to start the injection of pressurized gasoline in the engine cylinder.
  • the length of the piezoelectric actuator 18 decreases to its normal value and the valve needle 20 is pushed back in its closing position.
  • a plastically deformable adjustment element 22 is arranged axially aligned between a bottom action cap 24 of the piezoelectric actuator 18 and a head 26 of the valve needle 20.
  • the adjustment element 22 is formed as a hollow frustroconical and biconical metal body 30 with a central cylindrical area 32.
  • the metal body 30 has a shape for which a radial compression of the body 30 causes an axial elongation of the adjustment element 22.
  • Fig. 3 shows an exploded view of the adjustment element 22 together with the piezoelectric actuator 18.
  • the bottom end piece 24 of the piezoelectric actuator 18 comprises an engagement element 38, which allows the metal body 30 to be easily mounted to the piezoelectric actuator 18 by geometrical interference of the contact area 39 (Fig. 2) of the adjustment element 22 with the corresponding engagement element 38.
  • the adjustment element 22 further comprises a hardened hemispherical head pin 34 to optimize the contact with the needle head 26.
  • the hemispherical head pin 34 comprises an engagement element 36 allowing the metal body 30 to be easily mounted to the hemispherical head pin 34 by geometrical interference.
  • two through holes 28 and 29 are provided in the housing 12 of the injection valve 10 to provide access to the adjustment element 22 and allowing plastic deformation thereof after the complete assembly of the injection valve 10.
  • the two through holes 28 and 29 are radially aligned with the central crimping area 32 of the adjustment element and are spaced by 180° along the circumference of the housing 12. While only two through holes are shown in the embodiment of Fig. 1, it will be appreciated that three or more appropriately spaced through holes may be provided in the housing 12 as well.
  • the flow rate of the injector valve 10 can then be adjusted after it is completely assembled and welded. In this state the through holes 28 and 29 are initially closed by plastic plugs for packaging purposes.
  • the pre-adjusted lift and/or flow rate is measured. If the desired flow rate is not attained, the plastic plugs are removed and one or more punches are inserted in the through holes 28 and 29 and driven inwardly by applying strokes or a constant load. Thereby, the metal body 30 of the adjustment element 22 is gradually deformed.
  • the resulting plastic deformation of the metal body caused by the action of the punches induces an axial elongation of the of adjustment element 22 and therefore increases the spacing between the piezoelectric actuator 18 and the needle 20.
  • the relative movement of the upper and lower face of the metal body 30 is based on a controlled deformation, the desired lift and the desired flow rate can be achieved.

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

Claims (11)

  1. Dosiervorrichtung zum Dosieren von unter Druck stehenden Strömungsmitteln, insbesondere Einspritzventil für ein Kraftstoffeinspritzsystem in einer Brennkraftmaschine, mit
    - einem Gehäuse (12) mit einem Endteil, der mit einem Auslasskanal (14) versehen ist, welcher mit einer Dosieröffnung (16) endet,
    - einer axial beweglichen Ventilnadel (20), die sich durch den Auslasskanal (14) erstreckt und das Öffnen und Schließen der Dosieröffnung (16) steuert, und
    - einer piezoelektrischen Betätigungseinheit (18) in axialer Ausrichtung mit der Ventilnadel (20), die mit der Ventilnadel (20) zusammenwirkt, um deren Axialbewegung zu steuern,
    dadurch gekennzeichnet, dass ein plastisch verformtes Einstellelement (22) mit axialer Ausrichtung zwischen einem unteren Endteil (24) der piezoelektrischen Betätigungseinheit (18) und einem Kopf (26) der Ventilnadel (20) angeordnet ist, wobei durch eine plastische Verformung des Einstellelementes (22) der axiale Abstand zwischen der piezoelektrischen Betätigungseinheit (18) und der Ventilnadel (20) reguliert und auf diese Weise der Durchsatz der Dosiervorrichtung eingestellt wird.
  2. Dosiervorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Einstellelement (22) ein Metallelement (30, 32) umfasst, das so geformt ist, dass eine radiale Kompression des Elementes eine axiale Auslängung desselben bewirkt.
  3. Dosiervorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Einstellelement (22) einen ersten Kontaktbereich zur Montage des Einstellelementes (22) am unteren Endteil (21) der piezoelektrischen Betätigungseinheit (18), einen plastisch verformbaren Sickenbereich (30, 32), dessen radiale Kompression eine axiale Auslängung des Einstellelementes (22) bewirkt, und einen zweiten Kontaktbereich (34) zum Kontakt mit dem Kopf (26) der Ventilnadel (20) aufweist.
  4. Dosiervorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der erste Kontaktbereich des Einstellelementes (22) und das untere Endteil (24) der piezoelektrischen Betätigungseinheit (18) entsprechende Eingriffsmittel (38, 39) zur Montage des Einstellelementes (22) an der piezoelektrischen Betätigungseinheit (18) umfassen.
  5. Dosiervorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der zweite Kontaktbereich des Einstellelementes (22) einen gehärteten halbkugelförmigen Kopfstift (34) aufweist, um einen guten Kontakt mit dem Nadelkopf (26) herzustellen.
  6. Dosiervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Einstellelement (22) als hohler kegelstumpfförmiger und bikonischer Körper (30) mit einem zentralen zylindrischen Bereich (32) geformt ist.
  7. Dosiervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass zwei oder mehr Durchgangslöcher (28, 29) im Gehäuse (12) der Dosiervorrichtung (10) vorgesehen sind, die radial zu einem Sickenbereich (30, 32) des Einstellelementes (22) ausgerichtet sind, wobei die Durchgangslöcher (28, 29) einen Zugang zum Einstellelement (22) und eine plastische Verformung desselben nach der vollständigen Montage der Dosiervorrichtung ermöglichen.
  8. Verfahren zum Einstellen des Durchsatzes einer Dosiervorrichtung nach einem der vorangehenden Ansprüche, bei dem der Durchsatz durch eine vollständig montierte Dosiervorrichtung wiederholt gemessen und das Einstellelement allmählich radial komprimiert wird, bis ein vorgegebener Durchsatz durch die Dosiervorrichtung erreicht ist.
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass zum radialen Komprimieren des Einstellelementes ein oder mehrere Stanzwerkzeuge in die Durchgangslöcher des Gehäuses eingesetzt und nach innen getrieben werden, um auf diese Weise eine axiale Einstellung des Abstandes zwischen der piezoelektrischen Betätigungseinheit und der Ventilnadel zu induzieren.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass das Stanzwerkzeug oder die Stanzwerkzeuge durch aufgebrachte Schläge nach innen getrieben werden.
  11. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass das Stanzwerkzeug oder die Stanzwerkzeuge durch eine aufgebrachte Last nach innen getrieben werden.
EP20030001633 2003-01-24 2003-01-24 Messvorrichtung mit Durchfluss-Kalibriereinrichtung sowie Verfahren zur Einstellung der Durchflussmenge der Messvorrichtung Expired - Fee Related EP1445477B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2003604442 DE60304442T2 (de) 2003-01-24 2003-01-24 Messvorrichtung mit Durchfluss-Kalibriereinrichtung sowie Verfahren zur Einstellung der Durchflussmenge der Messvorrichtung
EP20030001633 EP1445477B1 (de) 2003-01-24 2003-01-24 Messvorrichtung mit Durchfluss-Kalibriereinrichtung sowie Verfahren zur Einstellung der Durchflussmenge der Messvorrichtung
JP2003301930A JP2004225687A (ja) 2003-01-24 2003-08-26 流量キャリブレータを備えた調量装置及び調量装置の流量を設定するための方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030001633 EP1445477B1 (de) 2003-01-24 2003-01-24 Messvorrichtung mit Durchfluss-Kalibriereinrichtung sowie Verfahren zur Einstellung der Durchflussmenge der Messvorrichtung

Publications (2)

Publication Number Publication Date
EP1445477A1 EP1445477A1 (de) 2004-08-11
EP1445477B1 true EP1445477B1 (de) 2006-04-05

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EP20030001633 Expired - Fee Related EP1445477B1 (de) 2003-01-24 2003-01-24 Messvorrichtung mit Durchfluss-Kalibriereinrichtung sowie Verfahren zur Einstellung der Durchflussmenge der Messvorrichtung

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EP (1) EP1445477B1 (de)
JP (1) JP2004225687A (de)
DE (1) DE60304442T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602006011587D1 (de) * 2006-06-06 2010-02-25 Continental Automotive Gmbh Verfahren zur Einstellung eines Brennstoffeinspritzventils
DE102010042476A1 (de) * 2010-10-14 2012-04-19 Robert Bosch Gmbh Vorrichtung zum Einspritzen von Kraftstoff
DE102011008468A1 (de) * 2011-01-13 2012-07-19 Continental Automotive Gmbh Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3735288A1 (de) * 1987-10-17 1989-04-27 Pierburg Gmbh Elektromagnetisches einspritzventil fuer brennkraftmaschinen
DE4137786C2 (de) * 1991-11-16 1999-03-25 Bosch Gmbh Robert Elektromagnetisch betätigbares Einspritzventil
DE19932762A1 (de) * 1999-07-14 2001-01-18 Bosch Gmbh Robert Verfahren zur Einstellung des Ventilhubs eines Einspritzventils
DE19958705C2 (de) * 1999-12-06 2003-03-13 Siemens Ag Ventil mit verbesserter Anschlaggeometrie
US6568602B1 (en) * 2000-05-23 2003-05-27 Caterpillar Inc Variable check stop for micrometering in a fuel injector
US6385848B1 (en) * 2000-06-29 2002-05-14 Siemens Automotive Corporation Method of setting armature/needle lift in a fuel injector

Also Published As

Publication number Publication date
EP1445477A1 (de) 2004-08-11
DE60304442D1 (de) 2006-05-18
DE60304442T2 (de) 2006-08-24
JP2004225687A (ja) 2004-08-12

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