EP1299638A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP1299638A1
EP1299638A1 EP01989419A EP01989419A EP1299638A1 EP 1299638 A1 EP1299638 A1 EP 1299638A1 EP 01989419 A EP01989419 A EP 01989419A EP 01989419 A EP01989419 A EP 01989419A EP 1299638 A1 EP1299638 A1 EP 1299638A1
Authority
EP
European Patent Office
Prior art keywords
swirl
fuel injection
injection valve
fuel
membrane
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.)
Granted
Application number
EP01989419A
Other languages
German (de)
English (en)
Other versions
EP1299638B1 (fr
Inventor
Fevzi Yildirim
Guenther Hohl
Michael Huebel
Norbert Keim
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 EP1299638A1 publication Critical patent/EP1299638A1/fr
Application granted granted Critical
Publication of EP1299638B1 publication Critical patent/EP1299638B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • 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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • AI is a fuel injection valve for the direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited
  • Internal combustion engine which has a guide and seat area at the downstream end of the fuel injection valve, which is formed by three disc-shaped elements.
  • a swirl element is embedded between a guide element and a valve seat element.
  • the guide element serves to guide an axially movable valve needle projecting through it, while a valve closing section of the valve needle interacts with a valve seat surface of the valve seat element.
  • the swirl element has an inner opening area with a plurality of swirl channels which are not connected to the outer circumference of the swirl element. The entire opening area extends completely over the axial thickness of the swirl element.
  • a disadvantage of the fuel injector known from the abovementioned publication is in particular that Fixed swirl angle that cannot be adapted to different operating conditions such as partial and full load operation of an internal combustion engine. As a result, the cone opening angle of the injected mixture cloud cannot be adapted to the different operating states, which leads to inhomogeneities in the combustion, increased fuel consumption and increased exhaust gas emissions.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the swirl is adjustable depending on the operating state of the internal combustion engine, whereby a spray pattern adapted to the operating state of the internal combustion engine can be generated. This enables the mixture formation and the combustion process to be optimized.
  • the influence on the jet opening angle is advantageously effected via the pressure of the fuel flowing through the fuel injection valve, which causes a change in the cross section of the swirl channels through an elastic membrane in accordance with the operating state and thereby enables a direct influence on the swirl intensity.
  • the formation of the membrane as a disk-shaped membrane, which is arranged between the swirl disk and a guide disk, is particularly advantageous.
  • This embodiment is particularly easy and inexpensive to manufacture and can be used for any shape of swirl disk. It is also advantageous that the disk-shaped membrane is connected to the outside of the guide disk, since leakage losses are thereby avoided.
  • the membrane can also be designed as an elastic layer, which can be arranged on any side surface of the swirl channel.
  • Fig. 1 shows an axial section through a
  • Fig. 2 is a schematic view of an exemplary
  • Fig. 3 is a schematic view of a swirl channel of the swirl disk shown in Fig. 2, and
  • FIGS. 4A-4B show a schematic representation of the functioning of the first and a second exemplary embodiment of a membrane arranged on the swirl disk.
  • FIG. 1 Before exemplary embodiments of a fuel injector 1 according to the invention are described in more detail with reference to FIGS. 2 to 4, the fuel injector 1 according to the invention in an overall view should first be understood with reference to FIG. 1 be briefly explained with regard to its essential components.
  • the fuel injection valve 1 is in the form of a fuel injection valve for fuel injection systems of mixture-compressing, spark-ignited
  • Fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
  • the fuel injection valve 1 comprises a nozzle body 2, in which the valve needle 3 is arranged.
  • the valve needle 3 is operatively connected to a valve closing body 4, which cooperates with a valve seat surface 6 arranged on a valve seat body 5 to form a sealing seat.
  • the fuel injector 1 is an inwardly opening fuel injector 1 which has at least one spray opening 7.
  • the nozzle body 2 is sealed by a seal 8 against the outer pole 9 of a magnetic circuit.
  • a magnetic coil 10 is encapsulated in a coil housing 11 and wound on a coil support 12, which bears against an inner pole 13 of the magnetic circuit.
  • the inner pole 13 and the outer pole 9 are separated from one another by a gap 26 and are supported on a connecting component 29.
  • the magnet coil 10 is excited via a line 19 by an electrical current that can be supplied via an electrical plug contact 17.
  • the plug contact 17 is surrounded by a plastic sheath 18, which can be molded onto the inner pole 13.
  • valve needle 3 is guided in a valve needle guide 14, which is disc-shaped.
  • a paired adjusting disk 15 is used for stroke adjustment.
  • An armature 20 is located on the other side of the adjusting disk 15. This armature is non-positively connected to the valve needle 3 via a first flange 21, which is connected to the first flange 21 by a weld seam 22 connected is.
  • a restoring spring 23 is supported on the first flange 21 and, in the present design of the fuel injector 1, is preloaded by a sleeve 24.
  • a second flange 31 which is connected to the valve needle 3 via a weld seam • 33, serves as the lower anchor stop.
  • An elastic intermediate ring 32 which rests on the second flange 31, prevents bouncing when the fuel injector 1 is closed.
  • a guide disk 35 On the inlet side of the sealing seat, a guide disk 35 is formed, which ensures a central alignment of the valve needle 3 and thus closely counteracts tilting of the valve needle 3 and subsequent inaccuracies in the metered fuel.
  • a swirl disk 34 which has swirl channels 36, is arranged between the guide disk 35 and the valve seat body 5.
  • a membrane 37 is provided, which preferably consists of an elastic material and which is deformable under the influence of the system pressure prevailing in the fuel injection valve 1. A detailed representation of the membrane 37 and its mode of operation can be seen in FIGS. 3 and 4.
  • Fuel channels 30a to 30c run in the valve needle guide 14, in the armature 20 and in the guide disk 35.
  • the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
  • the fuel injector 1 is sealed by a seal 28 against a fuel line, not shown.
  • the armature 20 In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 against its stroke direction in such a way that the valve closing body 4 is held in sealing contact with the valve seat 6.
  • the magnet coil 10 When the magnet coil 10 is excited, it builds up a magnetic field which the armature 20 counteracts the spring force of the Return spring 23 moves in the stroke direction, the stroke being predetermined by a working gap 27 in the rest position between the inner pole 12 and the armature 20.
  • the armature 20 also carries the flange 21, which is welded to the valve needle 3, in the lifting direction.
  • the valve closing body 4, which is operatively connected to the valve needle 3, lifts off the valve seat surface 6 and the fuel is sprayed off.
  • the armature 20 drops from the inner pole 13 after the magnetic field has been sufficiently reduced by the pressure of the return spring 23, as a result of which the flange 21 which is operatively connected to the valve needle 3 moves counter to the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, as a result of which the valve-closure member 4 is seated on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • the swirl disk 34 has four swirl channels 36 which are offset tangentially to a center of the swirl disk 34.
  • the offset of the swirl channels 36 and their radial length, their number and arrangement are arbitrary.
  • the cross section of the swirl channels 36 depends on the fuel pressure and the requirements for
  • Swirl disk 34 and the membrane 37 according to the invention are adapted.
  • FIG. 3 shows an excerpt from a sectional view of a section of the swirl disk 34 shown in FIG. 2 of the fuel injection valve 1 according to the invention in area III in FIG. 2.
  • The, for example, cuboidal swirl channel 36 shown in FIG. 3 has, similar to a cover plate, the membrane 37, which covers the swirl channel 36.
  • the membrane 37 can be arranged as a disk-shaped membrane 37a between the swirl disk 34 and the guide disk 35 or in the form of an elastic layer 37b on an end face of the guide disk 35 facing the swirl disk 34.
  • the arrow indicates the direction of flow of the fuel.
  • the arrangement of the membrane 37 is not limited to the position between the guide disk 35 and the swirl disk 34, but can in principle take place on each of the radially extending side surfaces 41.
  • the disk-shaped design and the arrangement between the swirl disk 34 and the guide disk 35 is represented as a preferred exemplary embodiment by the particularly simple shape and type of arrangement.
  • FIGS. 4A and 4B illustrate the mode of operation of the disk-shaped membrane 37a and the elastic layer 37b.
  • the membrane 37a or the layer 37b is shown in each case at the top in FIGS. 4A and 4B.
  • FIG. 4A The operation of the disk-shaped membrane 37a is shown schematically in FIG. 4A.
  • the swirl channel 36 is in a lateral sectional view along the in Fig.
  • Membrane 37a is between the swirl disk 34 and the
  • the swirl flow caused in the swirl chamber 39 is only weakly pronounced, as a result of which a mixture cloud injected into the combustion chamber of the internal combustion engine has a small jet opening angle.
  • the penetration of the mixture cloud is correspondingly high, which corresponds to the requirements for the shape and stoichiometry of the mixture cloud in part-load operation.
  • the disk-shaped membrane 37a experiences a deformation due to a shift in the acting force ratio, which allows the axial expansion of the swirl channel 36 to decrease. Accordingly, the speed of the fuel flowing through the swirl channels 36 continues to increase, as a result of which the swirl is also increased. This causes the mixture cloud injected into the combustion chamber to expand, which therefore has a larger jet opening angle and homogeneously fills the combustion chamber with an ignitable mixture.
  • FIG. 4B shows, in the same view as FIG. 4A, the membrane 37 designed as an elastic layer 37b.
  • the elastic layer 37b shown in FIG. 4B is not arranged as a loose disk between the swirl disk 34 and the guide disk 35, but in shape an elastic layer 37b formed on the outlet-side end face 38 of the guide disk 35, which is connected in its entire extent to the guide disk 35.
  • the mode of operation is accordingly the reverse of that of the exemplary embodiment shown in FIG. 4A. If the fuel pressure in the fuel injection valve 1 increases during operation, the elastic layer 37b is deformed against the flow direction with subsequently larger cross sections of the swirl channels 36. This is due to the fact that the elastic layer 37b which is firmly connected to the outflow-side end face 38 is displaced or compressed when the fuel pressure increases.
  • the invention is not restricted to the exemplary embodiments shown and can also be used in particular in the case of fuel injection valves 1 with piezoelectric or magnetostrictive actuators 10 and in any shape of swirl discs 34 with any swirl channels 36 of any shape.

Abstract

L'invention concerne une soupape d'injection de carburant (1), en particulier pour l'injection directe de carburant dans une chambre de combustion d'un moteur à combustion interne à allumage extérieur et à compression du mélange. Cette soupape d'injection de carburant comprend un actionneur (10), un pointeau de soupape (3) pouvant être actionné par l'actionneur (10) et actionnant lui-même un obturateur (4) qui, avec une surface de siège de soupape (6), crée une zone étanche, ainsi qu'un disque à tourbillonnement (34) qui dispose d'au moins un canal à tourbillonnement (36). Une membrane élastique (37) est placée côté sortie d'écoulement du disque à tourbillonnement (34), de telle sorte qu'une section de dosage du canal ou des canaux à tourbillonnement (36) puisse être modifiée en fonction d'une pression de carburant régnant dans la soupape d'injection de carburant (1) pendant le fonctionnement.
EP01989419A 2000-12-19 2001-12-15 Soupape d'injection de carburant Expired - Lifetime EP1299638B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10063259A DE10063259A1 (de) 2000-12-19 2000-12-19 Brennstoffeinspritzventil
DE10063259 2000-12-19
PCT/DE2001/004751 WO2002050427A1 (fr) 2000-12-19 2001-12-15 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1299638A1 true EP1299638A1 (fr) 2003-04-09
EP1299638B1 EP1299638B1 (fr) 2004-05-26

Family

ID=7667764

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01989419A Expired - Lifetime EP1299638B1 (fr) 2000-12-19 2001-12-15 Soupape d'injection de carburant

Country Status (5)

Country Link
US (1) US20050072864A1 (fr)
EP (1) EP1299638B1 (fr)
JP (1) JP2004516409A (fr)
DE (2) DE10063259A1 (fr)
WO (1) WO2002050427A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5880872B2 (ja) * 2013-01-14 2016-03-09 株式会社デンソー 燃料噴射弁及び燃料噴射装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647013A (en) * 1985-02-21 1987-03-03 Ford Motor Company Silicon valve
US4756508A (en) * 1985-02-21 1988-07-12 Ford Motor Company Silicon valve
DE19736682A1 (de) * 1997-08-22 1999-02-25 Bosch Gmbh Robert Brennstoffeinspritzventil
US5996912A (en) * 1997-12-23 1999-12-07 Siemens Automotive Corporation Flat needle for pressurized swirl fuel injector
US6145496A (en) * 1998-04-07 2000-11-14 Siemens Automotive Corporation Fuel injector with porous element for atomizing fuel under air pressure
JP2000055226A (ja) * 1998-08-03 2000-02-22 Zexel Corp 流体噴射弁
JP4593784B2 (ja) * 1998-08-27 2010-12-08 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 燃料噴射弁
US6168098B1 (en) * 1999-06-09 2001-01-02 Siemens Automotive Corporation Fuel injector with tubular lower needle guide
DE10034445A1 (de) * 2000-07-15 2002-01-24 Bosch Gmbh Robert Brennstoffeinspritzventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0250427A1 *

Also Published As

Publication number Publication date
WO2002050427A1 (fr) 2002-06-27
US20050072864A1 (en) 2005-04-07
DE10063259A1 (de) 2002-07-11
JP2004516409A (ja) 2004-06-03
EP1299638B1 (fr) 2004-05-26
DE50102422D1 (de) 2004-07-01

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