EP1339974A1 - Systeme d'injection de carburant - Google Patents

Systeme d'injection de carburant

Info

Publication number
EP1339974A1
EP1339974A1 EP01998731A EP01998731A EP1339974A1 EP 1339974 A1 EP1339974 A1 EP 1339974A1 EP 01998731 A EP01998731 A EP 01998731A EP 01998731 A EP01998731 A EP 01998731A EP 1339974 A1 EP1339974 A1 EP 1339974A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
valve
fuel
pressure chamber
injection system
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Withdrawn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
EP01998731A
Other languages
German (de)
English (en)
Inventor
Franz Rieger
Thomas Ludwig
Hans Schlembach
Gottlob Haag
Ulrich Brenner
Michael Huebel
Juergen Stein
Udo Sieber
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 EP1339974A1 publication Critical patent/EP1339974A1/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Withdrawn legal-status Critical Current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
    • F02M61/162—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
    • 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
    • F02M61/18—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 is based on a fuel injection system according to the preamble of the main claim.
  • a fuel injector which has a first compression spring and a second compression spring which are arranged one behind the other.
  • a driver device Via a driver device, a valve needle with a valve closing body is prestressed against a sealing seat by the first compression spring. If the valve needle is lifted out of the sealing seat by an electromagnetic actuator, this movement initially only counteracts the spring force of the first compression spring. After a certain partial stroke, the driver device strikes a spring contact disk of the second compression spring. If the valve needle with valve closing body is raised further from the sealing seat, the first and second compression springs now counteract this stroke.
  • the opening cross section in the sealing seat can be controlled by the size of the stroke.
  • the flow rate of the fuel injector can consequently be controlled, since the spring constant increases sharply as soon as the second compression spring the valve needle is also subjected to a counterforce.
  • a disadvantage of this known fuel injector is that the flow rate is regulated essentially in two stages. It is difficult to influence the beam pattern in a targeted manner.
  • a fuel injection valve which has a hydraulically controllable control piston.
  • This actuating piston limits the possible stroke of a valve needle as a stop. With increasing pressure of a hydraulic fluid controlling it, the actuating piston is displaced from an initial position in the closing direction of the valve needle.
  • a disadvantage of this prior art is that only regulation of the fuel flow rate is possible.
  • the shape of a spray jet cannot be influenced. Especially with very small flow rates, this can lead to problems if a spray opening has a cross-section that is too large in relation to the flow rate, and there is no sufficient distribution of the fuel in the spray pattern of the fuel injector.
  • the fuel injection system according to the invention with the characterizing features of the main claim has the advantage, in contrast, of enabling a stepless regulation of the flow rate.
  • the shape of a rounded narrowing of the spray opening of the fuel injection valve causes the flow of fuel to bear against a wall of the spray opening when hydraulic fluid is applied to the pressure chamber. This causes the fuel to experience itself in the area widening constriction an acceleration directed towards the wall of the spray opening and a formation of a jet pattern is possible even with low flow rates.
  • the position and length of the jet shape section m of the spray opening allow the jet pattern to be adjusted in relation to the flow rate, since the throttling of the flow rate simultaneously effects the shaping of the jet pattern.
  • the spray opening of the fuel injection valve can advantageously penetrate the pressure chamber and the jet shape section can thus consist of a sleeve-shaped wall section of the spray opening.
  • the jet-shaped section can advantageously consist of a thin-walled sleeve inserted into the spray opening, which can extend to the mouth of the spray opening and can rest on the mouth with a molded collar.
  • the beam shape section is inexpensive to manufacture and with little series spread.
  • the elasticity properties, by which the degree of a bulge of the sleeve under pressure is determined, can be easily adjusted by the choice of a suitable material for the sleeve.
  • a pressure fluid inlet can advantageously be connected to the pressure chamber via a 3/2-way valve and the pressure chamber can be connected to a pressure fluid outlet via the 3/2-way valve.
  • a pressure fluid inlet can be connected to the pressure chamber via a throttle and the pressure chamber can be connected to a pressure fluid outlet via a 2/2-way valve.
  • a swirl disk can also advantageously be arranged upstream of the sealing seat.
  • Fig. 1 shows a schematic section through a
  • FIG. 2 shows a schematic partial section through an exemplary embodiment of a fuel injection system according to the invention in area II in FIG. 1,
  • FIG. 3 shows a schematic partial section through a further exemplary embodiment of a fuel injection system according to the invention corresponding to the area II in FIG. 1, and
  • FIG. 4 shows a schematic plan view of a swirl element of the exemplary embodiment m FIG. 1. Description of the exemplary embodiments
  • a fuel injector 1 shown in FIG. 1 of a fuel injection system is in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, spark-ignited
  • Fuel injection valve 1 is particularly suitable for the direct injection of fuel into a combustion chamber (not shown) of an internal combustion engine.
  • the fuel injector 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is operatively connected to a valve closing body 4 m, 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 an injection opening 7.
  • the nozzle body 2 is sealed by a seal 8 against the outer pole 9 of a solenoid 10.
  • the magnet coil 10 is encapsulated in a coil housing 11 and wound on a coil carrier 12, which bears against an inner pole 13 of the magnet coil 10.
  • 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 lifting adjustment.
  • An armature 20 is located on the other side of the adjusting disk 15.
  • This anchor is non-positively connected to the valve needle 3 m 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, which in the present design of the fuel injection valve 1 is preloaded by a sleeve 24.
  • Fuel channels 30a and 30b run in the valve needle guide 14 and in the armature 20.
  • 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.
  • a spray-forming section 34 is formed on the spray opening 7 and, in the present exemplary embodiment, is designed as a sleeve inserted into the spray opening.
  • a detailed illustration of the beam shape section 34 can be seen in FIGS. 2 and 3.
  • the armature 20 In the idle state of the fuel injection valve 1, the armature 20 is acted on by the return spring 23 against its stroke direction in such a way that the valve closing body 4 is held in a sealing arrangement on the valve seat 6.
  • the magnet coil 10 When the magnet coil 10 is excited, it builds up a magnetic field which moves the armature 20 against the spring force of the return spring 23 m in the stroke direction, the stroke being predetermined by a working gap 27 between the inner pole 12 and the armature 20 in the rest position.
  • the armature 20 also carries the flange 21, which is welded to the valve needle 3, with the stroke direction.
  • 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 m, moves counter to the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, as a result of which the valve closing body 4 rests on the valve seat surface 6 and the fuel injector 1 is closed.
  • FIG. 2 shows an enlarged sectional view of an enlarged view of the part on the absp ⁇ tzseite of the first exemplary embodiment of a fuel injection valve 1 of a fuel injection system according to the invention described in FIG. 1.
  • the section shown is designated II in Fig. 1. 1 corresponding components are provided with the same reference numerals.
  • the valve seat body 5 is connected to the nozzle body 2 via a weld 35.
  • the valve closing body 4 interacts with the valve seat surface 6 to form a sealing seat.
  • a seal 36 serves to seal the fuel injection valve 1 from a bore of a cylinder head, not shown here.
  • the valve needle 3 is integrally formed with the valve closing body 4 and is operatively connected to it.
  • the valve needle 3 passes through a guide element 37 and a swirl element 38.
  • the swirl element 38 is arranged between the guide element 37 and the valve seat body 5.
  • Guide element 37, swirl element 38 and valve seat body 5 are connected to one another via a weld seam 39.
  • the fuel reaches the sealing seat on the valve seat surface 6 via inlet areas 40, only one of which is shown in section in the drawing, and swirl channels 41.
  • a sleeve 42 is inserted as a jet shaping section 34, which extends to the mouth of the spray opening 7 on the combustion chamber side and with a collar 43 at the mouth of the spray opening
  • the spray opening 7 is present.
  • the spray opening 7 is arranged at an angle ⁇ to a central axis of the fuel injection valve 1.
  • the jet shaping section 34 is surrounded by a pressure chamber 44, the spray opening 7 penetrating the pressure chamber 44 in the exemplary embodiment described, the pressure chamber 44 consequently enclosing the spray opening 7 radially outward over the entire circumference.
  • the length of the sleeve 42, which forms the jet shaping section 34, is greater than the length of the pressure chamber 44 in the direction of extension of the spray opening 7.
  • the pressure chamber 44 is connected to a 3/2-way valve 46 via a control bore 45. This 3/2-way valve 46 is only shown with its hydraulic switching symbol and can be designed both outside the fuel injection valve 1 and integrated therein.
  • the pressure chamber 44 can be connected to a fuel chamber 47, which is connected to the central fuel supply 16 and contains fuel under the pressure of the central fuel supply 16. This connection option is shown schematically in the drawing by a connecting line.
  • the pressure chamber 44 can be connected to a fuel outlet 48.
  • the fuel itself serves as the pressure fluid with which the pressure chamber 44 can be acted on.
  • the pressure chamber 44 is pressurized with the pressurized fuel via the 3/2-way valve 46, the sleeve 42 deforms elastically in the region of its longitudinal extent in which it is surrounded by the pressure chamber 44.
  • the deformation is indicated by dashed lines. Since the sleeve 42 forming the jet shaping section 34 is longer in the direction of extension of the spray opening 7 than the pressure space 44, this takes place only in the area of the pressure chamber 44 a deformation narrowing the spray opening 7, and in particular no step of the spray opening 7 is formed.
  • F g. 3 shows an enlarged sectional view of an enlarged view of the spray-side part of a fuel injection valve 1 of a further fuel injection system according to the invention.
  • the extract corresponds to section II in FIG. 1 and FIG. 1, the same or corresponding parts of the fuel injection valve 1 are provided with the same reference numerals.
  • the nozzle body 2 is connected to the valve seat body 5 via the weld seam 35.
  • the valve closing body 4, which is integrally formed with the valve needle 3, interacts with the valve seat surface 6 to form the sealing seat.
  • the seal 36 serves to seal the fuel injection valve 1 from a bore in a cylinder head, not shown here.
  • the valve needle 3 is guided by the guide element 37, which at the same time fixes the swirl element 38 on the valve seat body 5.
  • Guide element 37, swirl element 38 and Valve seat body 5 interconnected. The fuel reaches the sealing seat on the valve seat surface 6 via the inlet areas 40 and the swirl channels 41.
  • a spray opening 49 is arranged here centrally along a central axis of the fuel injection valve 1.
  • the sleeve 42 is used as a jet shaping section 34, which extends to the mouth of the spray opening 49 on the combustion chamber side and bears with a collar 43 at the mouth of the spray opening 49.
  • the jet shape section 34 is surrounded by the pressure space 44.
  • the pressure chamber 44 Via a throttle 50 and an inlet bore 51, the pressure chamber 44 is connected to a fuel chamber 47, which is connected to the central fuel supply 16 and contains fuel under the pressure of the central fuel supply 16.
  • the pressure chamber 44 can be connected to a fuel outlet 48 via a control channel 52 and a 2/2-way valve 53.
  • the 2/2-way valve 53 is only shown with its hydraulic switching symbol and can be designed both outside the fuel injection valve 1 and integrated therein.
  • the fuel outlet 48 is also shown in the drawing only as a symbol.
  • the fuel itself serves as the pressure fluid with which the pressure chamber 44 can be acted on.
  • Fig. 4 shows a top view of an exemplary embodiment of the swirl element 38 with radially inward and tangential swirl channels 41. When the fuel flows through the swirl channels 41, it is set into a rotational movement, which has the effect of beam shaping, in particular when the flow rate is low and the bulge is strong of the beam shape section 34 reinforced.

Landscapes

  • 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)

Abstract

L'invention concerne un système d'injection de carburant. Une soupape d'injection de carburant (1) présente un obturateur (4) qui coopère avec une surface siège de soupape (6) d'un corps siège de soupape (5) pour former un siège d'étanchéité. Au moins un orifice d'injection (7, 49), placé en aval du siège d'étanchéité, est étanchéifié par le siège d'étanchéité vis-à-vis d'une alimentation en carburant (16). L'orifice d'injection (7) présente une section de forme de jet (34) qui est constituée d'une section mince paroi, de l'orifice d'injection (7, 49), située en face d'un compartiment de pression. Et le compartiment de pression (44) peut être soumis à la pression d'un fluide de pression.
EP01998731A 2000-11-28 2001-11-26 Systeme d'injection de carburant Withdrawn EP1339974A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10059009A DE10059009A1 (de) 2000-11-28 2000-11-28 Brennstoffeinspritzanlage
DE10059009 2000-11-28
PCT/DE2001/004402 WO2002044550A1 (fr) 2000-11-28 2001-11-26 Systeme d'injection de carburant

Publications (1)

Publication Number Publication Date
EP1339974A1 true EP1339974A1 (fr) 2003-09-03

Family

ID=7664947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01998731A Withdrawn EP1339974A1 (fr) 2000-11-28 2001-11-26 Systeme d'injection de carburant

Country Status (7)

Country Link
US (1) US20030080202A1 (fr)
EP (1) EP1339974A1 (fr)
JP (1) JP2004514833A (fr)
KR (1) KR20020069251A (fr)
CN (1) CN1396986A (fr)
DE (1) DE10059009A1 (fr)
WO (1) WO2002044550A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10214904A1 (de) * 2002-04-04 2003-10-16 Bosch Gmbh Robert Brennstoffeinspritzventil
CN100462550C (zh) * 2003-02-04 2009-02-18 三菱电机株式会社 燃料喷射阀
FR2878583A1 (fr) * 2004-11-29 2006-06-02 Renault Sas Buse d'injection de carburant
DE102011089925A1 (de) * 2011-12-27 2013-06-27 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465967A (en) * 1967-01-18 1969-09-09 Thiokol Chemical Corp Flexible hot gas valve
FR2326235A1 (fr) * 1975-10-01 1977-04-29 Renault Buse elastique a debit variable
DE2711391A1 (de) 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
US4576338A (en) * 1984-08-29 1986-03-18 General Motors Corporation Fuel injector with hoop nozzle spray tip
DE4222137B4 (de) * 1992-07-06 2006-05-04 Robert Bosch Gmbh Kraftstoff-Einspritzdüse für Diesel-Brennkraftmaschinen
DE4434892A1 (de) 1994-09-29 1996-04-11 Siemens Ag Einspritzventil
DE19703200A1 (de) * 1997-01-30 1998-08-06 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19815781A1 (de) * 1998-04-08 1999-10-14 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19815800A1 (de) * 1998-04-08 1999-10-14 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19815789A1 (de) * 1998-04-08 1999-10-14 Bosch Gmbh Robert Brennstoffeinspritzventil
JP3758400B2 (ja) * 1999-01-26 2006-03-22 トヨタ自動車株式会社 燃料噴射装置
JP3953230B2 (ja) * 1999-05-07 2007-08-08 三菱電機株式会社 筒内噴射用燃料噴射弁
US6502761B1 (en) * 2000-07-28 2003-01-07 Siemens Automotive Corporation Wall effect injector seat

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0244550A1 *

Also Published As

Publication number Publication date
WO2002044550A1 (fr) 2002-06-06
US20030080202A1 (en) 2003-05-01
DE10059009A1 (de) 2002-05-29
KR20020069251A (ko) 2002-08-29
CN1396986A (zh) 2003-02-12
JP2004514833A (ja) 2004-05-20

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