EP1741925A1 - Soupape d'injection de fluide - Google Patents

Soupape d'injection de fluide Download PDF

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Publication number
EP1741925A1
EP1741925A1 EP05014578A EP05014578A EP1741925A1 EP 1741925 A1 EP1741925 A1 EP 1741925A1 EP 05014578 A EP05014578 A EP 05014578A EP 05014578 A EP05014578 A EP 05014578A EP 1741925 A1 EP1741925 A1 EP 1741925A1
Authority
EP
European Patent Office
Prior art keywords
fluid
damper
adjusting tube
injection valve
spring
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Withdrawn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
EP05014578A
Other languages
German (de)
English (en)
Inventor
Alessandro Facchin
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.)
Siemens AG
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
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP05014578A priority Critical patent/EP1741925A1/fr
Publication of EP1741925A1 publication Critical patent/EP1741925A1/fr
Withdrawn legal-status Critical Current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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats
    • 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 invention relates to a fluid injection valve.
  • One way to reduce these emissions is to improve the combustion process in the internal combustion engine. This may be achieved by precisely dosing the fluid. This is a challenge in particular for small quantities of fluid to be dosed into a combustion chamber of an internal combustion engine.
  • US 5,967,419 discloses a fuel injector with a valve, with a valve seat, with a valve closing element that is dedicated to the valve seat.
  • the valve closing element is connected to an armature.
  • the armature is preloaded by a spring to the valve seat.
  • the spring is arranged in a tube and adjacent to a spring pin, that is arranged in the tube as well. The spring is pressed to fit within the tube, the spring normally biases the armature in a closing direction of the valve.
  • US 5,937,887 discloses a method of assembling an electromagnetically actuated disk-type valve with a calibration slide, a filter holder and a spring.
  • the filter holder is moveably located in the fuel passage of the valve between the calibration slide and the spring.
  • the tension of the spring is set by the calibration slide that is moved to the appropriate location with a tool.
  • the calibration slide is formed from an elongated role of spring steel that fixes itself in the fuel passage of the valve.
  • the object of the invention is to provide a fluid injection valve, which enables precise dosing of fluid.
  • the object is obtained by the features of the independent claim.
  • Advantageous embodiments are disclosed in the subclaims.
  • the invention is distinguished by a fluid injection valve with a body comprising a recess, with a needle being arranged in the recess of the body and preventing a fluid flow through at least one injection nozzle in a closing position and outside of the closing position enabling the fluid flow.
  • a spring is provided, which preloads the needle towards the closing position.
  • the fluid injection valve further comprises a driver for controlling the position of the needle.
  • An adjusting tube is provided for setting the preloading force of the spring.
  • the adjusting tube is designed for the fluid flowing through it towards the injection nozzle and is provided with a damper.
  • the damper is designed for dampening the fluid flow.
  • the invention is based on the finding oscillations of the fluid pressure occurred in the area of the injection nozzle following a movement of the needle away from the closing position, which have a significant influence on the amount of fluid actually dosed especially with very small quantities of fluid to be dosed.
  • these oscillations may be effectively dampened and in that way, even with small quantities of fluid to be dosed, these quantities may be precisely dosed due to an improved linear control behavior of the fuel injection valve.
  • the damper enables to stabilize pressure and an instantaneous fluid flow.
  • the damper is arranged in an area of a fluid inlet of the adjusting tube.
  • the damper comprises multiple orifices. In that way a reduced pressure drop has been observed with, at the same time, very good dampening properties. This further improves precise dosing, especially very small quantities of fluid.
  • the damper is made in one piece with the adjusting tube. This enables to include the damper in the fluid injection valve with few production steps and therefore especially in mass production at only little extra cost for manufacturing the damper.
  • a fluid injection valve ( Figure 1), that is in particular suited for dosing fuel into an internal combustion engine, comprises a fitting adapter 1 being designed for fitting the injection valve to a fluid reservoir, such as a fuel rail.
  • the fluid injection valve further comprises an inlet tube 2 and a valve body 4 and a housing 6.
  • a body of the valve may therefore comprise one or more of the fitting adapter 1, the inlet tube 2, the valve body 4 and the housing 6.
  • a recess 8 in the valve body 4 is provided, which takes in a needle 10 and preferably part of an armature 12.
  • a recess 16 of the inlet tube 2 is provided which further extends to a recess 18 of the armature 12.
  • a spring 14 is arranged in the recess 16 of the inlet tube 2 and/or the recess 18 of the armature 12. Preferably it rests on a spring seat being formed by an anti-bounce disk 20. The spring 14 is in this way mechanically coupled to the needle 10.
  • An adjusting tube 22 is provided in the recess 16 of the inlet tube 2. The adjusting tube 22 forms a further seat for the spring 14 and may during the manufacturing process of the fluid injection valve be axially moved in order to preload the spring 14 in a desired way. This process is further described below.
  • the injection nozzle 24 may, for example, be an injection hole it may however also be of some other type suitable for dosing fluid.
  • the seat 26 may be made in one part with the valve body or may also be a separate part from the valve body 4. In addition to that preferably a lower guide 28 for guiding the needle 10 is provided. In addition preferably a swirl disk 30 may be provided.
  • the fluid injection valve is provided with a drive, that is preferably an electromagnetic drive, comprising a coil 36, which is preferably overmolded, a valve body shell 38, the armature 12 and the inlet tube 2 all forming an electromagnetic circuit.
  • a drive that is preferably an electromagnetic drive, comprising a coil 36, which is preferably overmolded, a valve body shell 38, the armature 12 and the inlet tube 2 all forming an electromagnetic circuit.
  • the adjusting tube 22 is pushed into the recess 16 to an initial position. Then the fluid injection valve may be calibrated by succeedingly energizing the coil 36 which then results in an electromagnetic force acting on the needle and acting against the mechanical force obtained from the spring 14 and after a given time deenergizing the coil 36 again.
  • the needle 10 may in that way be moved away from its closing position resulting in fluid flowing through the injection nozzle 24.
  • the fluid flow or the amount of fluid dosed may then be measured and a desired correlation between a control signal for energizing and deenergizing the coil and an actual amount of fluid dosed may be calibrated by axially moving the adjusting tube. In this way the preloading force of the spring 14 may be adjusted.
  • the inlet tube may be plastically deformed in a way that the adjusting tube 22 is axially fixed in respect to the inlet tube 2.
  • an overmolded portion of the housing is then created by a molding process and in that way also a connector for electrically connecting the fluid injection valve externally may be created.
  • a fluid inlet 42 is provided in the fitting adapter 1 which then communicates with a filter 44.
  • the adjusting tube 22 is designed for the fluid flowing through it towards the injection nozzle 24.
  • the anti-bounce disk 20 is provided with an appropriate recess and also the armature 12 is provided with an appropriate recess.
  • the adjusting tube 22 is provided with a damper 46 ( Figure 2).
  • the damper is designed for dampening a fluid flow.
  • the damper 46 comprises at least one orifice, through which the fluid must flow when flowing from the fluid inlet 42 of the injector to the at least one injection nozzle 24.
  • the damper 46 comprises a single orifice 48
  • the damper 46 comprises multiple orifices 50, 52, 54, which may be a present in an amount of two, three, four, five or also a suitable other amount of orifices.
  • the orifices 48, 50, 52, 54 are designed in order to provide desired dampening properties of the damper 46.
  • the design is made taking into consideration that a pressure drop due to the dampening should be minimized and the other hand pressure oscillations after moving the needle 10 out of its closing position should also be minimized. In this way by making simulations or just simply trying different properties of the orifices an optimum or nearly optimum solution may be found.
  • Figure 6 shows two traces of the fluid pressure p in the recess 8 plotted over the time t where 60 denotes the trace of the pressure without having the damper installed in the adjusting tube 22 and 62 denotes the trace of respective pressure p with the damper 46 arranged in the adjusting tube 22.
  • TPW denotes a control pulse width
  • t1 denotes the point of time of the needle 10 beginning to leave its closing position
  • t2 denotes the point of time, when the pressure p reaches its stablized level with the damper 46 being installed
  • t3 denotes the beginning of the movement of the needle 10 back towards its closing position.
  • the damper is arranged in an area of the fluid inlet of the adjusting tube 22 as shown by way of example in Figures 4 and 5. It may, however, also be arranged in another location of the adjusting tube 22.
  • the damper 46 may be formed as a separate part from the adjusting tube 22 and may be connected to the adjusting tube 22, for example by way of welding or any other suitable process of connecting the two parts. Especially for mass production it is however preferred to manufacture the adjusting tube 22 and the damper 46 from one part and in this case it is preferred to drill the single orifice 48 or the multiple orifices 50 to 54 directly into the adjusting tube 22.
  • the orifices may however also have another geometrical form apart from a cylindrical form, which also serves the purpose of properly dampening the pressure oscillations.
  • the adjusting tube 22 may also be axially moveable in respect to the inlet tube 2 during the calibration process by a suitable geometry of the adjusting tube 22 and the inlet tube 2, which e.g. allows for an axial movement in only one direction and assures a fixation in the opposite direction. Then the step of plastically deforming a part of the fluid injection valve for fixing the adjusting tube 22 relative to the inlet tube 2 may be omitted.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP05014578A 2005-07-05 2005-07-05 Soupape d'injection de fluide Withdrawn EP1741925A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05014578A EP1741925A1 (fr) 2005-07-05 2005-07-05 Soupape d'injection de fluide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05014578A EP1741925A1 (fr) 2005-07-05 2005-07-05 Soupape d'injection de fluide

Publications (1)

Publication Number Publication Date
EP1741925A1 true EP1741925A1 (fr) 2007-01-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05014578A Withdrawn EP1741925A1 (fr) 2005-07-05 2005-07-05 Soupape d'injection de fluide

Country Status (1)

Country Link
EP (1) EP1741925A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2163758A1 (fr) * 2008-09-11 2010-03-17 Continental Automotive GmbH Injecteur à carburant
WO2014013059A1 (fr) 2012-07-19 2014-01-23 Fmp Technology Gmbh Fluid Measurements & Projects Système d'injection de carburant
WO2015086192A1 (fr) * 2013-12-13 2015-06-18 Robert Bosch Gmbh Soupape d'injection de carburant
EP2891788A1 (fr) * 2013-12-13 2015-07-08 Robert Bosch GmbH Soupape d'injection de combustible
EP3034857A1 (fr) * 2014-12-16 2016-06-22 Robert Bosch Gmbh Soupape d'injection de combustible

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116389A (en) * 1976-12-27 1978-09-26 Essex Group, Inc. Electromagnetic fuel injection valve
US4811905A (en) * 1986-06-04 1989-03-14 Hitachi, Ltd. Electromagnetic fuel injector
DE4038142C1 (en) * 1990-11-30 1992-04-09 Pierburg Gmbh, 4040 Neuss, De Fuel injection valve for IC-engine - has spring loaded valve closure with magnetic actuator and throttled duct
EP0523405A2 (fr) * 1991-07-18 1993-01-20 Robert Bosch Gmbh Procédé d'ajustement d'une soupape d'injection de combustible et soupape d'injection de combustible
WO2002010583A1 (fr) * 2000-08-02 2002-02-07 Robert Bosch Gmbh Soupape d'injection de carburant et son procede de reglage
WO2002090757A1 (fr) * 2001-05-09 2002-11-14 Robert Bosch Gmbh Soupape d'injection de carburant comprenant un element d'amortissement
WO2004083622A1 (fr) * 2003-03-18 2004-09-30 Siemens Vdo Automotive Spa Injecteur de carburant ayant un element antivibrant et procede de fabrication de cet injecteur

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116389A (en) * 1976-12-27 1978-09-26 Essex Group, Inc. Electromagnetic fuel injection valve
US4811905A (en) * 1986-06-04 1989-03-14 Hitachi, Ltd. Electromagnetic fuel injector
DE4038142C1 (en) * 1990-11-30 1992-04-09 Pierburg Gmbh, 4040 Neuss, De Fuel injection valve for IC-engine - has spring loaded valve closure with magnetic actuator and throttled duct
EP0523405A2 (fr) * 1991-07-18 1993-01-20 Robert Bosch Gmbh Procédé d'ajustement d'une soupape d'injection de combustible et soupape d'injection de combustible
WO2002010583A1 (fr) * 2000-08-02 2002-02-07 Robert Bosch Gmbh Soupape d'injection de carburant et son procede de reglage
WO2002090757A1 (fr) * 2001-05-09 2002-11-14 Robert Bosch Gmbh Soupape d'injection de carburant comprenant un element d'amortissement
WO2004083622A1 (fr) * 2003-03-18 2004-09-30 Siemens Vdo Automotive Spa Injecteur de carburant ayant un element antivibrant et procede de fabrication de cet injecteur

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2163758A1 (fr) * 2008-09-11 2010-03-17 Continental Automotive GmbH Injecteur à carburant
US8286893B2 (en) 2008-09-11 2012-10-16 Continental Automotive Gmbh Fuel injector
WO2014013059A1 (fr) 2012-07-19 2014-01-23 Fmp Technology Gmbh Fluid Measurements & Projects Système d'injection de carburant
DE102012212745A1 (de) 2012-07-19 2014-01-23 Fmp Technology Gmbh Fluid Measurements & Projects Kraftstoffeinspritzsystem
US9447762B2 (en) 2012-07-19 2016-09-20 Fmp Technology Gmbh Fluid Measurements & Projects Fuel injection system
WO2015086192A1 (fr) * 2013-12-13 2015-06-18 Robert Bosch Gmbh Soupape d'injection de carburant
EP2891788A1 (fr) * 2013-12-13 2015-07-08 Robert Bosch GmbH Soupape d'injection de combustible
CN105829701A (zh) * 2013-12-13 2016-08-03 罗伯特·博世有限公司 燃料喷射阀
JP2017503948A (ja) * 2013-12-13 2017-02-02 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング 燃料噴射弁
US10753332B2 (en) 2013-12-13 2020-08-25 Robert Bosch Gmbh Fuel injector having a throttle element
EP3034857A1 (fr) * 2014-12-16 2016-06-22 Robert Bosch Gmbh Soupape d'injection de combustible

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