EP1876349B1 - Verfahren zur Kalibrierung von Einspritzventil - Google Patents

Verfahren zur Kalibrierung von Einspritzventil Download PDF

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Publication number
EP1876349B1
EP1876349B1 EP06014132.2A EP06014132A EP1876349B1 EP 1876349 B1 EP1876349 B1 EP 1876349B1 EP 06014132 A EP06014132 A EP 06014132A EP 1876349 B1 EP1876349 B1 EP 1876349B1
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EP
European Patent Office
Prior art keywords
injector
tube
double
cover
fluid
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
EP06014132.2A
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English (en)
French (fr)
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EP1876349A1 (de
Inventor
Marco Siringo
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
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Continental Automotive GmbH
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Publication date
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Priority to EP06014132.2A priority Critical patent/EP1876349B1/de
Publication of EP1876349A1 publication Critical patent/EP1876349A1/de
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Publication of EP1876349B1 publication Critical patent/EP1876349B1/de
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
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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

Definitions

  • the invention relates to calibrate an injector with an injector assembly.
  • the injector assembly comprises a double-tube-shaped fluid pipe and an injector cover.
  • the injector cover has a fluid connection of the injector and a fluid line of the injector cover.
  • the fluid line of the injector cover communicates with the fluid connection of the injector.
  • the injector cover is at least partly arranged in the double-tube-shaped fluid pipe.
  • Modern internal combustion engines often are designed very compact. In such internal combustion engines there is not much space for components, for example an injection valve, of the internal combustion engine. So, the injection valve has to be designed very compact. However, the injection valve has to be connected to a fuel connection and an electrical or hydraulic circuit for driving an actor of the injection valve. Further, such an injection valve has to be calibrated. In general, the two connections and means for calibrating the injection valve are very space consuming.
  • DE 199 32 760 A1 discloses a fuel injection valve designed to be mounted in the fuel injection system for an internal combustion engine.
  • the fuel injection valve comprises a piezoelectric or magnetostrictive actuator mounted in a valve body sealingly protected against the fuel by an actor housing.
  • the valve body and the actor housing have adjacent recesses.
  • the valve body is coupled to the actor housing in a marginal zone of the recesses.
  • a communicating orifice is formed sealed against the fuel.
  • the communicating orifice is filled with a filler element whereto at least an electric supply of the actuator is fixed inside said communicating orifice.
  • WO 2005/026558 A1 discloses a hydraulic system comprising a housing and a compensation reservoir.
  • the compensation reservoir has an elastic sleeve and a storage volume.
  • the elastic sleeve embraces the housing including the storage volume.
  • the storage volume is sealed from the exterior by the elastic sleeve.
  • the storage volume is hydraulically linked with an interior space of the hydraulic system. A dilatation of the elastic sleeve caused by a hydraulic pressure on the surface facing the housing results in an expansion of the storage volume which in turn allows the storage volume to receive an excess volume of a fluid from the interior space of the hydraulic system.
  • EP 1 548 854 A1 discloses an actuator unit comprising a tube spring, a piezoelectric actuator that is inserted into the tube spring, a first cap that is connected to the tube spring in a first free end of the tube spring and which is adjoined by the piezoelectric actuator.
  • a tube-shaped body is connected to the tube spring by joining and is arranged in the area of the second free end of the tube spring. Pretensioning means are arranged for pretensioning the piezoelectric actuator.
  • EP 1593841 A1 discloses a fuel injection valve with an actuator and a hydraulic coupler being arranged in a valve housing.
  • the hydraulic coupler includes a cylinder in which an axially movable coupler is arranged with a coupler gap between the piston and the cylinder.
  • An adjusting device is attached within an adjusting channel of the valve housing, and acts on the hydraulic coupler to set a predetermined coupler gap. Adjustment of the coupler gap is effected after sealing of the valve housing with the housing covers.
  • An injector assembly for an injector comprises a double-tube-shaped fluid pipe and an injector cover.
  • the injector cover has a fluid connection of the injector and a fluid line of the injector cover.
  • the fluid line of the injector cover communicates with the fluid connection of the injector.
  • the injector cover is at least partly arranged in the double-tube-shaped fluid pipe.
  • the injector cover and the double-tube-shaped fluid pipe are formed and arranged such that the relative axial position of the injector cover to the double-tube-shaped fluid pipe influences a.fluid injection characteristic of the injector.
  • the method comprises varying the relative axial position of the injector cover to the double-tube-shaped fluid pipe until the fluid injection characteristic of the injector corresponds to a given fluid injection characteristic.
  • the injector assembly enables to create the injector fairly compact because the injector cover fulfills three different tasks: sealing up the inside of the injector, embodying the fluid connection, and enabling the calibration of the injector through its axial position relative to the double-tube-shaped fluid pipe.
  • the fluid injection characteristic may comprise, for example, a spray shape of the injected fluid, an average drop size, an amount of injected fluid in a given time etc.
  • the injector cover has at least a first and a second axial section.
  • the first axial section has a larger diameter than the second axial section of the injector cover.
  • the fluid connection of the injector is formed at the first axial section of the injector cover facing away from the second axial section of the injector cover. This contributes to that the injector cover fulfills the three tasks in a simple way.
  • the double-tube-shaped fluid pipe comprises an electrical connection path which penetrates the double-tube-shaped fluid pipe at least partly radially. This contributes very effectively to the compactness of the injector.
  • the double-tube-shaped fluid pipe has an outer tube and an inner tube for guiding the fluid between the outer and the inner tube of the double-tube-shaped fluid pipe.
  • the outer tube of the double-tube-shaped fluid pipe is radially coupled to the first axial section of the injector cover.
  • the inner tube of the double-tube-shaped fluid pipe is radially coupled to the second axial section of the injector cover.
  • the double-tube-shaped fluid pipe communicates with the fluid line of the injector cover.
  • the coupling of the first axial section with the outer tube enables the sealing of the inside of the injector against the environment.
  • the coupling of the second axial section to the inner tube enables the sealing of the inside of the inner tube against the fluid.
  • An injector 2 ( figure 1 ) has a valve body 4 and a needle 6.
  • the needle 6 is arranged in a recess 8 of the valve body 4.
  • the needle 6 is movable in axial direction.
  • a first spring 10 forces the needle 6 via a spring washer 12 towards an actor 14 of the injector 2.
  • the actor 14 comprises a ground plate 16 and a top plate 18.
  • the actor 14 is a piezoelectric actuator.
  • the actor 14 is axially coupled to a hydraulic compensation device 20 at the top plate 18 of the actor 14.
  • the hydraulic compensation device may be arranged between the spring washer 12 and the ground plate 16 of the actor 14.
  • the injector 2 comprises an injector assembly ( figure 2 ).
  • the injector assembly comprises a double-tube-shaped fluid pipe 21 and an injector cover 24.
  • the double-tube-shaped fluid pipe 21 comprises an inner tube 22 and an outer tube 23.
  • a fluid, preferably fuel, is guided to an injection nozzle in a free volume between the inner tube 22 and the outer tube 23 of the double-tube-shaped fluid pipe 21.
  • the injection nozzle is formed by the valve body 4 and the needle 6, if the needle 6 is outside of its closing position. In the closing position of the needle 6 the needle 6 and the valve body 4 prevent a fluid flow by closing the injection nozzle.
  • the injector cover 24 sealingly covers the injector.
  • the injector cover 24 preferably comprises a first axial section 26 and a second axial section 28.
  • the diameter of the first axial section 26 is larger than the diameter of the second axial section 28.
  • the first axial section 26 is radially coupled to the outer tube 23.
  • the second axial section 28 is radially coupled to the inner tube 22.
  • a fluid connection 30 of the injector is arranged at the first axial section 26 facing away from the second axial section 28.
  • a fluid line 32 of the injector cover 24 communicates with the fluid connection 30 and with the double-tube-shaped fluid pipe 21.
  • the fluid connection 30 is arranged for connecting the injector 2, for example, to an.external fluid line.
  • the injector cover 24 preferably is welded at the first axial section 26 to the outer tube 23.
  • the fluid connection 30 of the injector and the fluid line 32 of the injector cover 24 preferably are produced by drilling two simple holes into the injector cover 24.
  • an O-ring 34 is arranged between the second axial section 28 and the inner tube 22, for sealing up the inside of the double-tube-shaped fluid pipe 21 against the fluid,
  • the actor 14 is connected to an electric circuit. If the actor 14 gets energized, the injector 14 increases its axial length in some microseconds. If the actor 14 increases its length in such a fast way, the hydraulic compensation device 20 reacts like a stiff body. So, the ground plate 16 of the injector 14 forces the needle 6 away from the compensation device 20. If the force of the actor 14 on the needle 6 is the same or bigger than the force of the first spring 10 on the needle 6, the needle 6 moves away from its closing position and away from the hydraulic compensation device 20. Then, the injection nozzle is formed at the tips of the valve body 4 and the needle 6. In this way, the fluid flow through the injection nozzle is enabled. If the injector 2 gets deenergized again, the actor 14 decreases its length in some microseconds and the needle 6 closes the injection nozzle. So, the fluid flow through the injection nozzle is prevented.
  • the hydraulic compensation device 20 compensates that thermal expansion.
  • the injector 2 has to be calibrated.
  • the injector cover 24 is at least partially arranged in the double-tube-shaped fluid pipe 21.
  • the hydraulic compensation device 20 is coupled to the actor 14 and the actor 14 is coupled to the spring washer 12 and the needle 6.
  • the injector cover 24 gets pressed towards the actor 14 with a given force.
  • fluid is injected through the injector 2 and the force on the injector cover 24, and in particular the relative axial position of the injector cover 24 to the double-tube-shaped fluid pipe is varied until the fluid injection characteristic of the injector 2 corresponds to a given fluid injection characteristic.
  • the force is held and the injector cover 24 is welded to the outer tube 23.
  • the injector 2 may be calibrated by forming a threat on the injector cover 24 and a corresponding threat on the double-tube-shaped fluid pipe 21. Then, the injector cover 24 may be screwed onto the double-tube-shaped fluid pipe 21. Then, while screwing the injector cover 24 to the double-tube-shaped fluid pipe 21, fluid is injected by the injector 2. If the fluid injection characteristic corresponds to the given fluid injection characteristic, the screwing is stopped.
  • the fluid injection characteristic may comprise a spray shape of the injected fluid, an amount of injected fluid in a given time and/or with a given fluid pressure, an average drop size, an average drop range etc.
  • the injector cover 24 fulfills three different tasks: sealingly covering up the injector 2, forming the fluid connection of the injector 2, and enabling the calibration of the injector 2. This is very space saving because instead of the injector cover 24, normally, there would have to be three different components for fulfilling the three different tasks.
  • the injector assembly comprises an electrical connection path 36 ( figure 3 ).
  • the electrical connection path 36 penetrates the double-tube-shaped fluid pipe 21.
  • the electrical connection path 36 extends at least partly radially.
  • the electrical connection path 36 is arranged for the electrical contact of the actor 14 to the electrical circuit.
  • the electrical connection path 36 is sealed against the double-tube-shaped fluid pipe 21.
  • the injector cover 24 may comprise more axial sections.
  • the fluid connection 30 may be not arranged parallel to an axis of the injector 2 and/or not in an overlapping area with the axis of the injector 2. Further, there may be arranged further O-rings for sealing up the injector 2.

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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 (8)

  1. Verfahren zur Kalibrierung eines Injektors (2),
    wobei der Injektor (2) eine Injektorbaugruppe und einen Aktuator (14) umfasst, die Injektorbaugruppe ein Fluidrohr (21) in Form eines Doppelrohrs und eine Injektorabdeckung (24) mit einem Fluidanschluss (30) des Injektors (2) und mit einer Fluidleitung (32) der Injektorabdeckung (24) umfasst, welche mit dem Fluidanschluss (30) des Injektors (2) in Verbindung steht, die Injektorabdeckung (24) mindestens teilweise in dem Fluidrohr (21) in Form eines Doppelrohrs angeordnet ist, dadurch gekennzeichnet, dass die Injektorabdeckung (24) und das Fluidrohr (21) in Form eines Doppelrohrs derart ausgebildet und angeordnet sind, dass die relative axiale Position der Injektorabdeckung (24) zu dem Fluidrohr (21) in Form eines Doppelrohrs eine Fluidinjektionskennlinie des Injektors (2) beeinflusst,
    wobei das Verfahren umfasst, die relative axiale Position der Injektorabdeckung (24) zu dem Fluidrohr (21) zu verändern, bis die Fluidinjektionskennlinie des Injektors (2) einer gegebenen Fluidinjektionskennlinie entspricht.
  2. Verfahren gemäß Anspruch 1, wobei die Injektorabdeckung (24) mit einer gegebenen Kraft zu dem Aktuator (24) hin gedrückt wird und die Kraft verändert wird, um die axiale Position zu verändern.
  3. Verfahren gemäß Anspruch 2, ferner umfassend, die Kraft beizubehalten, wenn die Fluidinjektionskennlinie des Injektors (2) der gegebenen Fluidinjektionskennlinie entspricht, und die Injektorabdeckung (24) mit einem äußeren Rohr (23) des Fluidrohrs (21) in Form eines Doppelrohrs zu verschweißen.
  4. Verfahren gemäß Anspruch 1, wobei die Injektorabdeckung (24) an das Fluidrohr (21) in Form eines Doppelrohrs geschraubt ist, bis die Fluidinjektionskennlinie des Injektors (2) der gegebenen Fluidinjektionskennlinie entspricht.
  5. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, wobei die Injektorabdeckung (24) mindestens einen ersten und einen zweiten Achsabschnitt (26, 28) hat, der erste Achsabschnitt (26) einen größeren Durchmesser als der zweite Achsabschnitt (28) der Injektorabdeckung (24) hat und wobei der Fluidanschluss (30) des Injektors (2) von dem zweiten Achsabschnitt (28) der Injektorabdeckung (24) abgewandt an dem ersten Achsabschnitt (26) der Injektorabdeckung (24) ausgebildet ist.
  6. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, wobei das Fluidrohr (21) in Form eines Doppelrohrs einen elektrischen Verbindungsweg (36) aufweist, welcher das Fluidrohr (21) in Form eines Doppelrohrs mindestens teilweise durchdringt.
  7. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, wobei
    • das Fluidrohr (21) in Form eines Doppelrohrs ein äußeres Rohr (23) und ein inneres Rohr (22) hat, um das Fluid zwischen dem äußeren und dem inneren Rohr (23, 22) des Fluidrohrs (21) in Form eines Doppelrohrs zu leiten,
    • das äußere Rohr (23) des Fluidrohrs (21) in Form eines Doppelrohrs radial mit dem ersten Achsabschnitt (26) der Injektorabdeckung (24) verbunden ist,
    • das innere Rohr (22) des Fluidrohrs (21) in Form eines Doppelrohrs radial mit dem zweiten Achsabschnitt (28) der Injektorabdeckung (24) verbunden ist,
    • das Fluidrohr (21) in Form eines Doppelrohrs mit der Fluidleitung (32) der Injektorabdeckung (24) in Verbindung steht.
  8. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, wobei die Injektorbaugruppe einen O-Ring (34) umfasst, welcher zwischen dem zweiten Achsabschnitt (28) der Injektorabdeckung (24) und dem inneren Rohr (22) des Fluidrohrs (21) in Form eines Doppelrohrs angeordnet ist, um ein Inneres des inneren Rohrs (22) gegen das Fluid abzudichten.
EP06014132.2A 2006-07-07 2006-07-07 Verfahren zur Kalibrierung von Einspritzventil Expired - Fee Related EP1876349B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06014132.2A EP1876349B1 (de) 2006-07-07 2006-07-07 Verfahren zur Kalibrierung von Einspritzventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06014132.2A EP1876349B1 (de) 2006-07-07 2006-07-07 Verfahren zur Kalibrierung von Einspritzventil

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EP1876349A1 EP1876349A1 (de) 2008-01-09
EP1876349B1 true EP1876349B1 (de) 2016-05-18

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2094940A (en) * 1981-02-18 1982-09-22 Nissan Motor Piezo-electric valve
EP1593841A1 (de) * 2004-05-04 2005-11-09 Robert Bosch Gmbh Brennstoffeinspritzventil

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19932760A1 (de) * 1999-07-14 2001-01-18 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10343488A1 (de) * 2003-09-12 2005-04-07 Siemens Ag Hydrauliksystem mit Ausgleichsspeicher
EP1548854B1 (de) * 2003-12-22 2007-01-24 Siemens VDO Automotive S.p.A. Aktoreinheit und Verfahren zu deren Herstellung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2094940A (en) * 1981-02-18 1982-09-22 Nissan Motor Piezo-electric valve
EP1593841A1 (de) * 2004-05-04 2005-11-09 Robert Bosch Gmbh Brennstoffeinspritzventil

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