EP1307652A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP1307652A1
EP1307652A1 EP01962569A EP01962569A EP1307652A1 EP 1307652 A1 EP1307652 A1 EP 1307652A1 EP 01962569 A EP01962569 A EP 01962569A EP 01962569 A EP01962569 A EP 01962569A EP 1307652 A1 EP1307652 A1 EP 1307652A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injection
injection valve
combustion chamber
dead volume
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Withdrawn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
EP01962569A
Other languages
German (de)
English (en)
Inventor
Joerg Heyse
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1307652A1 publication Critical patent/EP1307652A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • the direct injection of fuel into the combustion chamber of an internal combustion engine generally occurs, in particular in the case of direct petrol injection or the injection of diesel.
  • the fuel injector according to the invention with the characterizing features of the main claim has the Advantage that these aforementioned negative effects of coking (soot deposition) are restricted or eliminated, particularly at the valve tip protruding into the combustion chamber, with its outlet openings.
  • coking deposits in the outlet openings can be largely prevented. Due to the buoyancy of the gas phase compared to the liquid phase, the gas remains in the device for storing combustion chamber gas.
  • the spray parameters and the valve function can be stably maintained over their long service life even when fuel is directly injected into a combustion chamber on the fuel injectors.
  • FIG. 1 shows a partially illustrated fuel injector and FIG. 2 shows a schematic section through an outlet opening with a liquid column standing therein and tearing off.
  • FIG. 1 a valve in the form of an injection valve for fuel injection systems of mixed-compression spark-ignition internal combustion engines is partially shown as an exemplary embodiment.
  • the injection valve has a tubular valve seat support 1, in which a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2.
  • a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2.
  • a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2.
  • the injection valve is actuated in a known manner, for example electromagnetically.
  • a schematically indicated electromagnetic circuit with a solenoid 10, an armature 11 and a core 12 is used for the axial movement of the valve needle 5 and thus for opening against the spring force of a return spring (not shown) or closing the injection valve.
  • the armature 11 is connected to the valve closing body 7 opposite end of the valve needle 5 by z.
  • B. a weld seam formed by means of a laser is connected and aligned with the core 12.
  • a guide opening 15 of a valve seat body 16 is used to guide the valve closing body 7 during the axial movement Core 12 facing away from the end of the valve seat support 1 in the concentric to the longitudinal axis 2 of the longitudinal opening 3 is sealed by welding.
  • the valve seat body 16 is, for example, cup-shaped, with a jacket part 17 of the valve seat body 16 merging in the direction of the armature 11 into a collar 18 resting on the valve seat carrier 1.
  • the valve seat body 16 On the side opposite the collar 18, the valve seat body 16 has a base part 19 which is, for example, convexly curved.
  • the insertion depth of the valve seat body 16 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 when the magnet coil 10 is not energized due to the valve closing body 7 resting on a valve seat surface 22 which is conically tapered or slightly curved at the bottom part 19 of the valve seat body 16 is set.
  • the other end position of the valve needle 5 is determined when the solenoid 10 is excited, for example by the armature 11 resting on the core 12. The path between these two end positions of the valve needle 5 thus represents the stroke.
  • the spherical valve closing body 7 interacts with the frustoconical or curved valve seat surface 22 of the valve seat body 16, which lies between the guide opening 15 and several in a central region of the base part 19 of the valve seat body 16 introduced outlet openings 23 is formed.
  • the bottom part 19 forms the spray region of the fuel injector.
  • the fuel injection valve is designed in particular as a so-called multi-hole valve, which is particularly suitable for injecting fuel directly into a combustion chamber, not shown.
  • the outlet openings 23 are aligned, for example, at different angles to the valve longitudinal axis 2, with, for example, all outlet openings 23 moving away from the valve longitudinal axis 2 in the downstream direction at an angle.
  • the fuel injection valve according to the invention is to a large extent to prevent coking deposits of the combustion chamber in the area of the outlet openings 23 from clogging them and thus to change the injection quantities considerably over the life of the valve.
  • valve closing body 7 and the curved bottom part 19 of the valve seat body 16 are formed with different radii, when the fuel injection valve is closed, there is a closed space within the annular valve seat surface 22 in the area of the outlet openings 23 between the valve closing body 7 and the bottom part 19, which has a dead volume 25 represents.
  • gas storage in the dead volume 25 should take place in order to avoid coking deposits at the outlet openings 23.
  • FIG. 2 schematically shows an outlet opening 23.
  • Valve closing body 7 is pressed back to the valve seat surface 22 at the end of the injection process, the flow through the outlet openings 23 is stopped abruptly. So no more fuel flows through the
  • the liquid column 27 which emerges from the outlet openings 23 immediately before the valve closes has a certain inertia due to its mass.
  • the negative pressure in the liquid column 27 which arises as a result of the closing of the valve and the associated stop of the flow in the sealing seat area becomes greater, starting from an outlet plane 28 of the outlet opening 23, in the upstream direction within the outlet opening 23 due to inertia.
  • the vapor pressure of the liquid falls below.
  • a vapor phase suddenly forms, as a result of which the part 30 of the liquid column 27 located downstream of this point 29 tears away from the remaining liquid due to inertia.
  • a meniscus of the liquid is formed within the outlet opening 23, at which there is a phase boundary between the liquid and the gas surrounding the valve.
  • all components directly on the combustion chamber are subject to extreme heat, including a direct injection valve, especially those in the combustion chamber protruding outlet openings 23.
  • coking residues can form in particular at the phase boundary mentioned above, which accumulate on the wall of the outlet opening 23 and lead to the disadvantages to be overcome which have already been explained.
  • annular coking deposits are formed in the outlet openings 23 at a certain depth, which disadvantageously constrict the flow.
  • this device for gas storage is designed as a central blind bore 33 in the valve closing body 7 on its surface facing the dead volume 25.
  • the blind bore 33 is with combustion chamber gas or with the
  • the valve closing body 7 from the valve seat surface 22 increases the liquid pressure in the dead volume 25, as a result of which the gas volume in the blind bore 33 is compressed. The gas is pressed deeper into the blind bore 33. When the valve closes, the liquid pressure decreases again and the gas volume expands again within the blind bore 33. Since the inflow of further liquid into the dead volume 25 is prevented when the valve is closed, the inertia of the liquid which just emerged creates a negative pressure in the liquid phase. This can the gas volume of the blind bore 33 expand even further, so that it partially reaches the dead volume 25. The volume of liquid displaced in this way can flow out of the outlet opening 23.
  • a plurality of smaller blind bores 33 can also be arranged side by side on the valve needle end facing the outlet openings 23 or on
  • Valve closing body 7 may be provided. This has the advantage that the cross section of the individual blind bores 33 is smaller for the same gas storage volume and thus the capillary action in the blind bores 33 increases. The stored gas can thus be driven out of the blind holes 33 even less by flow forces of the liquid.
  • valve needle tip or the valve closing body 7 are not exclusively the components of the fuel injector on which the blind bores 33 according to the invention can be formed. Rather, it is only necessary to ensure that the blind bores 33 have access to the dead volume 25 and that the gas volume cannot escape from the gas storage volume by means of buoyancy.

Landscapes

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

Abstract

L'invention concerne une soupape d'injection de carburant, notamment une soupape d'injection de carburant saillant directement dans une chambre de combustion d'un moteur à combustion interne, qui comprend un actionneur excitable (10, 11, 12), un corps de fermeture de soupape (7) mû par l'actionneur (10, 11, 12), un siège de soupape fixe (22) avec lequel le corps de fermeture de soupape (7) concourt pour ouvrir et fermer la soupape, une sortie de carburant réalisée dans une zone d'injection inférieure et formée par au moins une ouverture de sortie (23) située en aval du siège de soupape (22), ainsi qu'un volume mort (25) formé en aval du siège de soupape (22) et en amont de la zone d'injection présentant l'ouverture de sortie (23). Le corps de fermeture de soupape (7) contient un dispositif servant au stockage du gaz de chambre de combustion et ayant la forme d'un trou borgne (33) avec accès direct au volume mort (25).
EP01962569A 2000-08-04 2001-07-19 Soupape d'injection de carburant Withdrawn EP1307652A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10038097A DE10038097A1 (de) 2000-08-04 2000-08-04 Brennstoffeinspritzventil
DE10038097 2000-08-04
PCT/DE2001/002709 WO2002012720A1 (fr) 2000-08-04 2001-07-19 Soupape d'injection de carburant

Publications (1)

Publication Number Publication Date
EP1307652A1 true EP1307652A1 (fr) 2003-05-07

Family

ID=7651335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01962569A Withdrawn EP1307652A1 (fr) 2000-08-04 2001-07-19 Soupape d'injection de carburant

Country Status (9)

Country Link
US (1) US20030019465A1 (fr)
EP (1) EP1307652A1 (fr)
JP (1) JP2004506138A (fr)
KR (1) KR20020037059A (fr)
CN (1) CN1386170A (fr)
CZ (1) CZ20021156A3 (fr)
DE (1) DE10038097A1 (fr)
RU (1) RU2002110093A (fr)
WO (1) WO2002012720A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10325289A1 (de) * 2003-06-04 2005-03-17 Robert Bosch Gmbh Brennstoffeinspritzventil
US20070131803A1 (en) * 2005-12-13 2007-06-14 Phadke Milind V Fuel injector having integrated valve seat guide
JP4906466B2 (ja) * 2006-10-16 2012-03-28 日立オートモティブシステムズ株式会社 燃料噴射弁およびそれを搭載した内燃機関の燃料噴射装置
JP4817153B2 (ja) * 2009-11-06 2011-11-16 Ｎｅｃインフロンティア株式会社 情報端末に組み込まれたソフトウェアの更新時の認証方法、そのシステム及びそのプログラム
EP2657506B1 (fr) * 2010-12-20 2015-10-14 Toyota Jidosha Kabushiki Kaisha Injecteur de carburant
WO2012086006A1 (fr) * 2010-12-20 2012-06-28 トヨタ自動車株式会社 Injecteur de carburant
EP3296554A1 (fr) 2016-09-14 2018-03-21 Global Design Technology - GDTech SA Injecteur ouvrant vers l'intérieur permettant l'injection directe d'un combustible gazeux
CN107131074B (zh) * 2017-06-28 2023-08-01 哈尔滨工程大学 一种带压电执行器的集成式环歧管壁面气体燃料喷射混合装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186883A (en) * 1978-05-08 1980-02-05 Essex Group, Inc. Electromagnetic fuel injection valve with swirl means
US4711397A (en) * 1982-01-11 1987-12-08 Essex Group, Inc. Electromagnetic fuel injector having continuous flow path
US4487369A (en) * 1982-01-11 1984-12-11 Essex Group, Inc. Electromagnetic fuel injector with improved discharge structure
DE3236046C2 (de) * 1982-09-29 1986-03-20 Daimler-Benz Ag, 7000 Stuttgart Kraftstoffeinspritzdüse für Brennkraftmaschinen
DE3445405A1 (de) * 1984-12-13 1986-06-19 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares ventil
US4655396A (en) * 1985-09-25 1987-04-07 United Technologies Diesel Systems, Inc. Electromagnetic fuel injector
DE3714693A1 (de) * 1987-05-02 1988-11-10 Bosch Gmbh Robert Elektromagnetisch betaetigbares ventil
JPH0861189A (ja) * 1994-08-23 1996-03-05 Toyota Motor Corp 燃料噴射弁
JPH08144893A (ja) * 1994-11-21 1996-06-04 Nippondenso Co Ltd 燃料噴射ノズル
JPH11287169A (ja) * 1998-04-02 1999-10-19 Nissan Motor Co Ltd 燃料噴射弁

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0212720A1 *

Also Published As

Publication number Publication date
JP2004506138A (ja) 2004-02-26
CZ20021156A3 (cs) 2003-09-17
CN1386170A (zh) 2002-12-18
WO2002012720A1 (fr) 2002-02-14
US20030019465A1 (en) 2003-01-30
RU2002110093A (ru) 2004-02-27
DE10038097A1 (de) 2002-02-14
KR20020037059A (ko) 2002-05-17

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