EP1125044B1 - Systeme d'injection de carburant pour moteur a combustion interne - Google Patents

Systeme d'injection de carburant pour moteur a combustion interne Download PDF

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Publication number
EP1125044B1
EP1125044B1 EP00956112A EP00956112A EP1125044B1 EP 1125044 B1 EP1125044 B1 EP 1125044B1 EP 00956112 A EP00956112 A EP 00956112A EP 00956112 A EP00956112 A EP 00956112A EP 1125044 B1 EP1125044 B1 EP 1125044B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
central
injection
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.)
Expired - Lifetime
Application number
EP00956112A
Other languages
German (de)
English (en)
Other versions
EP1125044A1 (fr
Inventor
Bernd Mahr
Martin Kropp
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 EP1125044A1 publication Critical patent/EP1125044A1/fr
Application granted granted Critical
Publication of EP1125044B1 publication Critical patent/EP1125044B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/16—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor characterised by the distributor being fed from a constant pressure source, e.g. accumulator or constant pressure positive displacement pumps
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the invention is based on a fuel injection system for an internal combustion engine according to the preamble of the claim 1.
  • Such an injection system is, for example, by EP 0 711 914 A1 has become known.
  • a pressure-controlled fuel injection system the fuel pressure prevailing in the nozzle space of an injector opens a valve body (for example a nozzle needle) against the action of a closing force and thus releases the injection opening for an injection of the fuel.
  • the pressure at which fuel exits the nozzle chamber into the cylinder is called the injection pressure.
  • a stroke-controlled fuel injection system is understood in the context of the invention that the opening and closing of the injection opening of an injector take place with the aid of a displaceable valve member due to the hydraulic interaction of the fuel pressures in a nozzle chamber and in a control chamber.
  • an arrangement is referred to as central if it is intended for all cylinders together and as local if it is intended for only a single cylinder.
  • Fuel injection system is using a high pressure pump Fuel to a first high fuel pressure compressed by about 1200 bar and in a first pressure accumulator saved. Furthermore, it is under high pressure standing fuel also in a second pressure accumulator promoted in which by regulating its fuel supply a second high fuel pressure by means of a 2/2-way valve of approximately 400 bar is maintained.
  • the central valve control unit is either the lower one or higher fuel pressure in the injector nozzle area directed. There is a spring-loaded by the pressure Lifted the valve body from its valve seat so that Fuel can escape from the nozzle opening.
  • the lower fuel pressure is direct metered from the central pressure accumulator without using the Distribution device to go.
  • the pressure-controlled fuel injection system 1 is a two-stage high-pressure pump 2 is used to supply fuel to promote 3 from a storage tank 4 at two different fuel pressures.
  • the fuel is compressed to a first (lower) pressure of approximately 300 bar and fed via a delivery line 5 to a central pressure accumulator 6 (common rail), in which the fuel is stored under this pressure.
  • first pressure lines 7, corresponding to the number of individual cylinders, lead from the central pressure accumulator 6 to the individual injectors 8 (injection device) projecting into the combustion chamber of the internal combustion engine to be supplied.
  • the two-stage high-pressure pump 2 can be, for example, a cam pump with a spray adjuster similar to the distributor injection pump known from DE 35 16 867 A1.
  • the pressure is generated to a second (higher) fuel pressure of approx. 300 bar to approx. 1800 bar.
  • the fuel is fed via a delivery line 9 to a central distributor device 10 , which distributes the fuel to second pressure lines 11 , which also discharge to the injectors 8. Since the two delivery lines 5, 9 are connected to one another via a 2/2-way valve 12 , the higher fuel pressure is only built up when this connection is interrupted by energizing the 2/2-way valve 12. It is also possible that the two fuel pressures are generated by two different pumps.
  • a second pressure accumulator in which the fuel is stored under the higher pressure, can also be provided in front of the central distributor device 10.
  • a pressure surface of the valve element 16 pointing in the opening direction of the valve element 16 is exposed to the pressure prevailing there, the nozzle space 15 continuing through an annular gap between the valve element 16 and the guide bore up to the valve sealing surface 17 of the injector 8. Due to the pressure prevailing in the nozzle chamber 15, the valve member 16 sealing the injection openings 18 is opened against the action of a closing force (closing spring 19 ), the spring chamber 20 being relieved of pressure by means of a leakage line 21 .
  • a pre-injection takes place with the lower fuel pressure with de-energized 2/2-way valve 12 by energizing the local valve unit 13.
  • By energizing the 2/2-way valve 12 then takes place when the local valve unit is not energized 13 the main injection with the higher fuel pressure.
  • the local valve unit 13 becomes fuel pressure again energized.
  • the local valve unit 13 can either be part of the injector housing 1, as shown in Fig. 1, or outside the injector housing can be arranged (Fig. 2). in the latter case can be a smaller size of the injector housing to reach.
  • the higher fuel pressure can also be via a central one Pressure booster unit with refill and control mechanism be generated.
  • a central pressure accumulator can also be provided.
  • pressure controlled injectors you can also stroke-controlled injectors are used.
  • a fuel injection system 1 for an internal combustion engine in the fuel with at least two different high fuel pressures via injectors 8 in the combustion chamber of the internal combustion engine are injected can, with a central distribution device 10 for dividing of fuel to the individual injectors 8 and with a central pressure accumulator 6 for the lower one
  • Each fuel pressure is a valve unit 13 for switching between the two fuel pressures locally for each injector 8 is provided individually.
  • the central one Distribution device 10 for the higher fuel pressure parallel to the central pressure accumulator 6 for the lower one Fuel pressure arranged. To enlarge the Injection window for pre and post injection the lower fuel pressure from the central pressure accumulator 6 metered without using the distributor device 10 to go.

Landscapes

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

Claims (4)

  1. Système d'injection de carburant (1) pour un moteur à combustion interne, dans lequel du carburant peut être injecté dans la chambre de combustion du moteur à combustion interne à au moins deux niveaux différents de pression au moyen d'injecteurs (8), comportant une installation de distribution (10) centrale destinée à distribuer le carburant aux injecteurs (8) particuliers, un réservoir de pression (6) central pour la pression de carburant la plus basse et une unité de soupapes (13) destinée à passer d'une pression de carburant à l'autre,
       caractérisé en ce que
    l'unité de soupapes (13) destinée à passer d'une pression de carburant à l'autre est prévue localement pour chaque injecteur (8) individuellement et l'installation de distribution (10) centrale pour la pression de carburant la plus élevée est parallèle au réservoir de pression central (6) pour la pression de carburant la plus basse.
  2. Système d'injection de carburant selon la revendication 1,
    caractérisé par
    une unité de soupapes différente pour chaque pression de carburant.
  3. Système d'injection de carburant selon l'une des revendications précédentes,
    caractérisé en ce que
    les injecteurs (8) sont conçus pour une commande de la pression.
  4. Système d'injection de carburant selon l'une des revendications précédentes,
    caractérisé en ce que
    les injecteurs sont conçus pour une commande de course.
EP00956112A 1999-08-20 2000-08-02 Systeme d'injection de carburant pour moteur a combustion interne Expired - Lifetime EP1125044B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19939426 1999-08-20
DE19939426A DE19939426A1 (de) 1999-08-20 1999-08-20 Kraftstoffeinspritzsystem für eine Brennkraftmaschine
PCT/DE2000/002554 WO2001014709A1 (fr) 1999-08-20 2000-08-02 Systeme d'injection de carburant pour moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1125044A1 EP1125044A1 (fr) 2001-08-22
EP1125044B1 true EP1125044B1 (fr) 2004-11-03

Family

ID=7918961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00956112A Expired - Lifetime EP1125044B1 (fr) 1999-08-20 2000-08-02 Systeme d'injection de carburant pour moteur a combustion interne

Country Status (7)

Country Link
US (1) US6520153B1 (fr)
EP (1) EP1125044B1 (fr)
JP (1) JP2003507635A (fr)
AT (1) ATE281596T1 (fr)
DE (2) DE19939426A1 (fr)
ES (1) ES2231240T3 (fr)
WO (1) WO2001014709A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1826397A3 (fr) 2002-05-03 2009-08-05 Delphi Technologies, Inc. Système d'injection de carburant
DE102006006823B3 (de) * 2006-02-14 2007-03-15 Siemens Ag Verfahren und Vorrichtung zum Einspritzen von Kraftstoff
CN101936244A (zh) * 2010-04-29 2011-01-05 中国第一汽车集团公司无锡油泵油嘴研究所 新型内燃机高压燃油系统

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49108427A (fr) * 1973-02-19 1974-10-15
DE2558789A1 (de) * 1975-12-24 1977-07-14 Bosch Gmbh Robert Hochdruck-kraftstoffeinspritzeinrichtung fuer dieselmotoren
DE3516867A1 (de) * 1985-05-10 1986-11-13 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3618447A1 (de) * 1986-05-31 1987-12-03 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung fuer brennkraftmaschinen
JP2719924B2 (ja) * 1988-05-10 1998-02-25 株式会社ゼクセル 増圧式ユニットインジェクタ
DE3907766A1 (de) * 1989-03-10 1990-09-13 Bosch Gmbh Robert Speicherkraftstoffeinspritzvorrichtung
AT408133B (de) * 1990-06-08 2001-09-25 Avl Verbrennungskraft Messtech Einspritzsystem für brennkraftmaschinen
JP2882209B2 (ja) * 1992-09-11 1999-04-12 三菱自動車工業株式会社 蓄圧式燃料噴射装置
GB9422864D0 (en) * 1994-11-12 1995-01-04 Lucas Ind Plc Fuel system
US5732679A (en) * 1995-04-27 1998-03-31 Isuzu Motors Limited Accumulator-type fuel injection system
EP0760425B1 (fr) * 1995-08-30 2000-11-15 Robert Bosch Gmbh Dispositif d'injection
DE19535703C2 (de) * 1995-09-26 1997-07-31 Mtu Friedrichshafen Gmbh Brennstoffeinspritzsystem
DE19715785C2 (de) * 1997-04-16 1999-12-09 Mtu Friedrichshafen Gmbh Kraftstoffinjektor für eine Brennkraftmaschine für Kraftstoff/Emulsionsbetrieb
DE19738397A1 (de) * 1997-09-03 1999-03-18 Bosch Gmbh Robert Kraftstoffeinspritzanlage für eine Brennkraftmaschine
US6076504A (en) * 1998-03-02 2000-06-20 Cummins Engine Company, Inc. Apparatus for diagnosing failures and fault conditions in a fuel system of an internal combustion engine
AT2960U3 (de) * 1998-07-02 1999-11-25 Avl List Gmbh Brennkraftmaschine mit direkter einspritzung
DE69906459T2 (de) * 1998-11-20 2003-10-23 Mitsubishi Jidosha Kogyo K.K., Tokio/Tokyo Kraftstoffeinspritzvorrichtung der Accumulatorgattung
DE19939425B4 (de) * 1999-08-20 2005-05-04 Robert Bosch Gmbh Kraftstoffeinspritzsystem für eine Brennkraftmaschine
DE60000255T2 (de) * 1999-09-22 2003-03-27 Mitsubishi Jidosha Kogyo K.K., Tokio/Tokyo Speicherkraftstoffeinspritzvorrichtung

Also Published As

Publication number Publication date
WO2001014709A1 (fr) 2001-03-01
ES2231240T3 (es) 2005-05-16
US6520153B1 (en) 2003-02-18
ATE281596T1 (de) 2004-11-15
JP2003507635A (ja) 2003-02-25
DE50008496D1 (de) 2004-12-09
DE19939426A1 (de) 2001-03-01
EP1125044A1 (fr) 2001-08-22

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