EP1751423B1 - Systeme d'injection de carburant - Google Patents

Systeme d'injection de carburant Download PDF

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Publication number
EP1751423B1
EP1751423B1 EP05729602A EP05729602A EP1751423B1 EP 1751423 B1 EP1751423 B1 EP 1751423B1 EP 05729602 A EP05729602 A EP 05729602A EP 05729602 A EP05729602 A EP 05729602A EP 1751423 B1 EP1751423 B1 EP 1751423B1
Authority
EP
European Patent Office
Prior art keywords
fuel
injection system
valve
filter
supply line
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
EP05729602A
Other languages
German (de)
English (en)
Other versions
EP1751423A1 (fr
Inventor
Friedrich Boecking
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 EP1751423A1 publication Critical patent/EP1751423A1/fr
Application granted granted Critical
Publication of EP1751423B1 publication Critical patent/EP1751423B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series

Definitions

  • the invention is based on a fuel injection system of an internal combustion engine according to the closer defined in the preamble of claim 1. Art.
  • Such a fuel injection system is known in practice in many ways and is used, for example, for injecting fuel into a combustion chamber of a diesel internal combustion engine of a motor vehicle, see JP08277761A . DE4203144A1 . JP2000097124A . US4718386A ,
  • a known fuel injection system is designed, for example, as a so-called common rail injection system, which comprises a high pressure source which is connected to a so-called commmon rail high-pressure accumulator, which in turn is connected in each case via a fuel supply line with fuel injectors, each in a combustion chamber the internal combustion engine protrude.
  • the fuel injectors are usually each formed with a valve control unit and a nozzle unit. Into the nozzle unit leads a fuel channel which is connected to a fuel inlet of the respective fuel injector is, so that the fuel under high pressure can be injected into the respective combustion chamber.
  • a fuel injection valve for internal combustion engines which has a rod-shaped filter element for particles contained in the fuel in a fuel injector leading to the fuel injector. The particles are shattered in the filter element.
  • the fuel injection system according to the invention with the features according to the preamble of claim 1 and a check valve which is arranged in the fuel passage of the injector and blocks a fuel flow in the direction of the fuel supply line, provides a compact and cost-effective solution for suppressing a propagation of pressure waves from the fuel injector in the direction the source of high pressure fuel.
  • the fuel injection system according to the invention is, for example, a common-rail injection system of a diesel internal combustion engine of a motor vehicle.
  • the fuel injector is used in this case for the injection of fuel into a combustion chamber of the internal combustion engine.
  • the source of fuel under high pressure is then formed by a high-pressure accumulator, which forms the so-called common rail and provides fuel, which can be under a pressure of up to 1.8 kbar, for all injectors of the internal combustion engine.
  • the check valve has an at least partially spherically formed valve closure member which cooperates with a conical seat and is biased by a closing spring in the closing direction.
  • the closing spring is preferably supported on an example annular adjusting piece, so that the bias of the closing spring and thus the minimum pressure required to open the check valve can be adjusted.
  • Fuel injectors usually have a filter for the separation of particles in the region of their fuel inlet.
  • the fuel injection system according to the invention is designed so that the check valve has a valve seat, wherein the valve seat is formed on the fuel filter.
  • the Check valve is thus at least partially integrated Betstandteil the fuel filter.
  • the fuel filter is preferably designed as a rod filter having gaps or recesses, by means of which a comminution of particles takes place due to pressure pulsations.
  • the rod filter preferably has an annular groove over which the fuel can flow to the check valve.
  • a fuel injection system 10 is shown, which is a so-called common rail injection system and for injecting fuel into a combustion chamber of an internal combustion engine of a motor vehicle.
  • the fuel injection system 10 comprises a connected to a fuel tank not shown here high-pressure pump 11 which is connected to a high-pressure accumulator 12, which is a so-called common rail and fuel supply lines 13, 14, 15, 16 fuel at a pressure of up to 1 , 8 kbar provides for four similarly designed fuel injectors, of which in FIG. 1 the fuel injector 17 connected to the fuel supply line 13 is shown.
  • the high-pressure accumulator thus serves in the present case as a fuel source for the fuel injectors.
  • the fuel injector 17 comprises a valve control unit 18 and a nozzle unit 19, in which a nozzle needle 20 is axially displaceable, which serves to control spray holes 21, which are arranged on the front side of the nozzle module 19 facing away from the valve control module 18 and projecting into the combustion chamber of the internal combustion engine ,
  • the fuel injector 17 has a connecting piece or pressure pipe socket 22 with a fuel inlet 23, which is connected to the fuel supply line 13. From the fuel inlet 23, a fuel channel 24 leads to a high-pressure chamber 25 which encloses the nozzle needle 20 and from which fuel is injected via the injection holes 21 into the combustion chamber of the internal combustion engine when the nozzle needle 20 is open.
  • the fuel passage 24 is formed in the region of the fuel inlet 23 with an enlarged diameter.
  • the region of increased diameter forms a rod filter bore 25 into which a so-called rod filter 26 is pressed, which serves as a filter element for particles contained in the fuel and causes a comminution of the particles.
  • the rod filter 26 has at its periphery recesses 27, which together with the wall of the rod filter bore 25 form gaps which specify the maximum particle diameter that can pass through the rod filter 26.
  • the check valve 30 further has a closing spring 31, which acts on the valve closing member 29 and is supported on an annular shim 32 whose position or the thickness of which sets the bias of the closing spring 31.
  • the bias of the spring 31 can be adjusted by the Einpressianae of the rod filter 26 in the rod filter bore 25.
  • check valve 30 By means of the check valve 30 can be prevented that pressure waves generated within the injector 17, spread over the rest of the fuel injection system.
  • the rod filter 26 further includes an annular groove 33 which allows fuel flow between the filter unit of the rod filter 26 and the valve seat 28.
  • FIG. 4 is a known fuel inlet 40 in a fuel injector of a fuel injection system of the FIG. 1 shown type shown
  • the fuel inlet 40 differs from the inventive fuel inlet shown in Figure 2 in that it is formed without a filter element, ie without rod filter. Rather, the fuel channel 24 is provided in the region of the fuel inlet 40 with a check valve 30 which has a valve closure member serving as a ball 29, biased by a closing spring 31 in the reverse direction is, which is supported on a dial 32.
  • the valve closing member 29 cooperates with a valve seat 28, which forms a conical seat and is formed on a press-fit part 41 formed as a press belt.
  • valve needle 20 When the valve needle 20 is moved to the open position at the fuel injector 17, the quantity of fuel required for the injection process is taken from the high-pressure chamber 25 of the nozzle unit 19, the fuel channel 24 and the fuel supply line 13. In this case, the check valve 30, d opens. H. the valve ball 29 lifts off from its valve seat 28. Pressure waves that arise within the injector and run as reflection waves in the direction of the fuel inlet 23 and 40 and thus in the direction of the common rail 12, however, are deleted when the check valve 30 is closed.

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 un système d'injection de carburant d'un moteur à combustion interne, qui comprend au moins un injecteur de carburant (17) relié, par l'intermédiaire d'un orifice d'admission de carburant (23), à une conduite d'amenée de carburant (13) qui est reliée à une source (12) pour du carburant sous haute pression. Selon l'invention, l'injecteur de carburant (17) comprend une unité de commande de soupape (18) et une unité buse (19) à laquelle conduit un conduit de carburant (24) relié à la conduite d'amenée de carburant (13). Dans le conduit de carburant (24) se trouve une soupape antiretour (30) qui empêche un écoulement du carburant en direction de la conduite d'amenée de carburant.

Claims (5)

  1. Système d'injection de carburant d'un moteur à combustion interne, comprenant au moins un injecteur de carburant (17) qui est connecté par le biais d'une entrée de carburant (23, 40) à une conduite d'amenée de carburant (13, 14, 15, 16), qui est en liaison avec une source (12) de carburant sous haute pression, l'injecteur de carburant (17) comprenant une unité de commande de soupape (18) et une unité de buse (19) à laquelle conduit un canal de carburant (24) connecté à la conduite d'amenée de carburant (13), un clapet anti-retour (30) étant disposé dans le canal de carburant (24), lequel bloque un flux de carburant dans la direction de la conduite d'amenée de carburant (13), le clapet anti-retour (30) présentant un siège de clapet (28), caractérisé en ce que le clapet anti-retour est un constituant au moins partiellement intégral d'un filtre à carburant (26) disposé dans la région de l'entrée de carburant (23), le siège de clapet (28) étant réalisé au niveau du filtre à carburant (26).
  2. Système d'injection de carburant selon la revendication 1, caractérisé en ce que le clapet anti-retour (30) comprend un organe de fermeture de clapet (29) réalisé au moins en partie sous forme sphérique, qui coopère avec un siège conique (28) et qui est précontraint au moyen d'un ressort de fermeture (31) dans la direction de fermeture.
  3. Système d'injection de carburant selon la revendication 2, caractérisé en ce que le ressort de fermeture (31) s'appuie sur un élément d'ajustement (32).
  4. Système d'injection de carburant selon la revendication 1, caractérisé en ce que le filtre à carburant (26) est un filtre-tige.
  5. Système d'injection de carburant selon la revendication 1, caractérisé en ce que le filtre-tige (26) présente entre son unité de filtre et le siège de clapet (28) une rainure annulaire (33).
EP05729602A 2004-05-18 2005-03-01 Systeme d'injection de carburant Expired - Fee Related EP1751423B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004024528A DE102004024528A1 (de) 2004-05-18 2004-05-18 Kraftstoffeinspritzsystem
PCT/EP2005/050884 WO2005113976A1 (fr) 2004-05-18 2005-03-01 Systeme d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1751423A1 EP1751423A1 (fr) 2007-02-14
EP1751423B1 true EP1751423B1 (fr) 2011-12-28

Family

ID=34963036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05729602A Expired - Fee Related EP1751423B1 (fr) 2004-05-18 2005-03-01 Systeme d'injection de carburant

Country Status (4)

Country Link
US (1) US20070221175A1 (fr)
EP (1) EP1751423B1 (fr)
DE (1) DE102004024528A1 (fr)
WO (1) WO2005113976A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7617991B2 (en) * 2006-03-31 2009-11-17 Delphi Technologies, Inc. Injector fuel filter with built-in orifice for flow restriction
DE102006019283A1 (de) * 2006-04-26 2007-10-31 Bayerische Motoren Werke Ag Kraftstoffinjektor für eine Brennkraftmaschine
EP2034173A1 (fr) * 2007-09-07 2009-03-11 Siemens VDO Automotive S.p.A. Manchon de raccordement de carburant doté d'un filtre à carburant

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559364A (en) * 1944-06-24 1951-07-03 William H Mashinter Fuel injector
US2474419A (en) * 1945-02-02 1949-06-28 Jesse R Hale Fuel injection apparatus
US2680651A (en) * 1953-06-16 1954-06-08 American Locomotive Co Fuel injector
US3118611A (en) * 1963-02-04 1964-01-21 Martin J Berlyn Fuel injection nozzle
US4081140A (en) * 1976-07-19 1978-03-28 Caterpillar Tractor Co. Capsule-type fuel nozzle
US4197996A (en) * 1978-12-07 1980-04-15 Ford Motor Company Constant pressure fuel injector assembly
JPS58113574A (ja) * 1981-12-28 1983-07-06 Komatsu Ltd エンジンの燃料噴射装置
DE3201218A1 (de) * 1982-01-16 1983-07-28 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
NL8501647A (nl) * 1985-06-06 1987-01-02 Volvo Car Bv Brandstofinjector.
IT8553563V0 (it) * 1985-07-02 1985-07-02 Weber Spa Dispositivo di controllo per apparati di iniezione del combustibile per motori a ciclo diesel
DE3742241A1 (de) * 1987-02-14 1988-08-25 Daimler Benz Ag Piezosteuerventil zur steuerung der kraftstoffeinspritzung ueber ein einspritzventil bei brennkraftmaschinen
GB8820706D0 (en) * 1988-09-01 1988-10-05 Lucas Ind Plc Fuel injection systems
DE3923271A1 (de) * 1989-07-14 1991-01-24 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung fuer brennkraftmaschinen, insbesondere pumpeduese
DE4037952A1 (de) * 1990-11-29 1992-06-04 Bosch Gmbh Robert Verfahren zur montage eines filters an einem ventil und ventil
DE4203144A1 (de) * 1992-02-05 1993-08-12 Bosch Gmbh Robert Kraftstoffeinspritzduese fuer diesel-brennkraftmaschinen zum einspritzen von zuendunwilligem hauptkraftstoff und zuendkraftstoff
GB9404260D0 (en) * 1994-03-05 1994-04-20 Lucas Ind Plc Fuel injection nozzles
JPH08277761A (ja) * 1995-04-06 1996-10-22 Nippon Soken Inc 蓄圧式燃料噴射装置
DE19608608A1 (de) * 1996-03-06 1997-09-11 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JPH10122090A (ja) * 1996-10-14 1998-05-12 Komatsu Ltd ディーゼルエンジンの燃料噴射装置
DE19716771B4 (de) 1997-04-22 2005-10-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP2000097124A (ja) * 1998-09-17 2000-04-04 Nippon Soken Inc 高圧流体噴射装置
FR2792853B1 (fr) * 1999-04-30 2001-07-06 Bp Chemicals Snc Buse a ressort avec fente de 360 degres, pour l'injection de liquide dans un reacteur a lit fluidise
JP4583693B2 (ja) * 2000-02-02 2010-11-17 シーメンス ヴィディーオー オートモティヴ コーポレイション 燃料噴射器のフィルター兼アジャスタ
DE10109410A1 (de) * 2001-02-28 2002-09-05 Bosch Gmbh Robert Brennstoffeinspritzventil

Also Published As

Publication number Publication date
US20070221175A1 (en) 2007-09-27
WO2005113976A1 (fr) 2005-12-01
DE102004024528A1 (de) 2005-12-15
EP1751423A1 (fr) 2007-02-14

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