EP0946828B1 - Systeme d'injection de carburant d'un moteur a combustion interne - Google Patents

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

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Publication number
EP0946828B1
EP0946828B1 EP98942475A EP98942475A EP0946828B1 EP 0946828 B1 EP0946828 B1 EP 0946828B1 EP 98942475 A EP98942475 A EP 98942475A EP 98942475 A EP98942475 A EP 98942475A EP 0946828 B1 EP0946828 B1 EP 0946828B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
additional
injection system
fuel injection
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
EP98942475A
Other languages
German (de)
English (en)
Other versions
EP0946828A1 (fr
Inventor
Heinz Stutzenberger
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 EP0946828A1 publication Critical patent/EP0946828A1/fr
Application granted granted Critical
Publication of EP0946828B1 publication Critical patent/EP0946828B1/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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar 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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive

Definitions

  • the invention relates to a fuel injection system for an internal combustion engine according to the preamble of claim 1.
  • Such fuel injection systems are known for example from DE 43 37 048 C2.
  • a two-component nozzle is provided, which is used for the stratified injection of fuel and an additional liquid, for example diesel fuel and water, in order to reduce the pollutant emissions of the internal combustion engine and, if necessary, to increase the efficiency.
  • the so-called common rail technology is also implemented in the known injection system, in which all the injection nozzles that operate the internal combustion engine are supplied with fuel under high pressure from a common rail pressure accumulator.
  • a complex and relatively expensive 3/2-way valve is used for each individual injector for metering the quantity of additional liquid, and a further 3/2-way valve is used for controlling the diesel injection quantity.
  • the fuel supply from the common rail pressure accumulator to the injection nozzle is interrupted with the first 3/2-way valve and, at the same time, a pressure chamber surrounding the injection nozzle, in which fuel under high pressure is stored, by a corresponding position of the first 3 / 2-way valve drained to the fuel low pressure side. Due to the pressure drop occurring in the pressure chamber, a corresponding Line additional liquid pumped into the pressure chamber, which displaces the corresponding fuel volume.
  • the first 3/2-way valve is then brought back into a position which establishes a connection between the common rail pressure accumulator and the pressure chamber in the injection valve.
  • the additional 3/2-way solenoid valve is provided for the precise metering of the quantity of fuel to be injected, which is to follow the upstream additional liquid during the injection surge caused by the next valve opening, which optionally selects the rear of the nozzle needle, which is held in the closed position by a spring connects either to the common rail pressure accumulator or to the low-pressure fuel side, thereby controlling the stroke of the valve needle, the opening and closing of the valve, and thus the desired injection quantity.
  • the known fuel injection system requires the two precisely working and therefore complex 3/2-way control solenoid valves for each individual injector in order to be able to precisely dose both the desired amount of fuel and the required amount of additional liquid.
  • a fuel injection system according to the preamble of claim 1 is known from document EP 0 418 601 A.
  • the fuel injection system according to the invention has the characterizing features of patent claim 1 in order to simplify its construction and thus to make it more economical to manufacture.
  • the two complex and expensive 3/2-way solenoid control valves can be replaced by a single simpler and cheaper 2/2-way valve, because the quantity metering for the additional liquid is functional and constructive from the modules for fuel injection is separated.
  • the advantages known from common rail technology for fuel injection can be exploited.
  • a plurality of additional liquid lines, each leading to different two-substance nozzles can extend from the pressure storage container, and only a single valve unit can be provided for supplying an entire group of two-substance nozzles with additional liquid.
  • FIG. 1 An embodiment of the fuel injection device according to the invention for internal combustion engines is shown in the drawing and is explained in the following description.
  • the figure shows a schematic connection of an embodiment of the fuel injection system according to the invention with a pressure storage container for additional liquid.
  • a high pressure pump 1 supplies from a Tank 14 a common rail pressure accumulator 2 with fuel at a pressure level of approximately 1800 bar.
  • a quantity-metering component must now be arranged, since the previously conventional injection pump by the combination Common rail pressure accumulator 2 and the simpler high pressure pump 1 have been replaced and the rail pressure is constantly present at a certain level.
  • This task is performed in the arrangement according to the invention by a 2/2-way valve MV1.
  • the exact amount is metered via the known (measured or controlled) pressure drop between the commom-rail pressure accumulator 2 and the combustion chamber of the internal combustion engine to be supplied by the two-substance nozzle 3 through a precise time window, the size of which depends on other influencing factors, via an electrical control which is not shown in the drawing.
  • a small piston 3.3 is additionally provided on the blunt axial end of the nozzle needle (injector plunger) 3.1 facing away from the nozzle needle tip. With its end facing away from the nozzle needle 3.1, it protrudes into a space 3.6 which is connected via a line 4 directly to the common nozzle. Rail pressure accumulator 2 is connected and acted upon by the high pressure prevailing there becomes.
  • the additional liquid is injected into the two-substance nozzle 3 from a pressure storage container 7 via a storage valve 10, which can open or close an additional liquid line 13 leading to a check valve 3.4 in the two-substance nozzle 3.
  • the pressure storage tank 7 is charged with additional liquid from a reservoir 12 via a check valve 11 from a pump 8.
  • the pressure in the pressure storage container 7 is kept at a desired level via a pressure control valve 9.
  • the common rail pressure accumulator 2 for the fuel and the pressure accumulator container 7 for the additional liquid are made in one piece in order to save space in the engine compartment of the internal combustion engine.
  • the pump 8 for loading the pressure storage container 7 with additional liquid can be an electrically operated pump, for example a two-stage gear pump, which can deliver additional liquid up to a pressure level of approximately 50 bar.
  • the pressure storage tank 7 according to the invention for additional liquid can be used in engines with a very wide variety of cylinders and for injection systems with a wide variety of designs.

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 (7)

  1. Système d'injection de carburant pour un moteur à combustion interne, avec une pompe à haute pression (1) pour envoyer le carburant, de préférence du gazole, dans une buse à deux matières (3) ainsi qu'avec un dispositif de transport pour envoyer un liquide supplémentaire, de préférence de l'eau, conduit par une soupape anti-retour (3.4), dans une conduite de liquide supplémentaire (13) conduisant à la buse à deux matières (3), dans lequel il est prévu un réservoir d'accumulation de pression (7) avec du liquide supplémentaire se trouvant sous pression, qui est raccordé à la buse à deux matières (3) par la conduite de liquide supplémentaire (13) et la soupape anti-retour (3.4),
    caractérisé en ce que
    sous la commande d'une soupape intercalée (10) montée dans la conduite de liquide supplémentaire, la buse à deux matières (3) est alimentée par la conduite de liquide supplémentaire (13) et la soupape anti-retour (3.4) avec une quantité chaque fois prédéterminée de liquide supplémentaire, le réservoir d'accumulation de pression étant alimenté en liquide supplémentaire au moyen d'une pompe (8) par une autre soupape anti-retour (11) et la pression interne du réservoir d'accumulation de pression (7) étant maintenue à un niveau désiré par une soupape de régulation de pression (9).
  2. Système d'injection de carburant selon la revendication 1,
    caractérisé en ce que
    la pompe (8) présente un entraînement électrique.
  3. Système d'injection de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    la pompe (8) est une pompe à engrenages de préférence à deux étages.
  4. Système d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    un accumulateur de pression à rampe commune (common rail) (2) rempli de carburant se trouvant sous haute pression, est prévu pour alimenter en carburant une conduite d'injection (6) conduisant à la buse à deux matières (3).
  5. Système d'injection de carburant selon la revendication 4,
    caractérisé en ce que
    le réservoir d'accumulation de pression (7) pour le liquide supplémentaire et l'accumulateur de pression à rampe commune (common rail) (2) sont réalisés d'une seule pièce.
  6. Système d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    plusieurs conduites de liquide supplémentaire (13') conduisant chacune à des buses à deux matières différentes partent du réservoir d'accumulation de pression (7).
  7. Système d'injection de carburant selon la revendication 6,
    caractérisé en ce qu'
    une seule unité de soupape intercalée est prévue chaque fois pour alimenter tout un groupe de buses à deux matières (3) avec du liquide supplémentaire.
EP98942475A 1997-10-22 1998-07-01 Systeme d'injection de carburant d'un moteur a combustion interne Expired - Lifetime EP0946828B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19746491 1997-10-22
DE19746491A DE19746491A1 (de) 1997-10-22 1997-10-22 Kraftstoffeinspritzanlage für eine Brennkraftmaschine
PCT/DE1998/001816 WO1999020890A1 (fr) 1997-10-22 1998-07-01 Systeme d'injection de carburant d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP0946828A1 EP0946828A1 (fr) 1999-10-06
EP0946828B1 true EP0946828B1 (fr) 2004-03-31

Family

ID=7846177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98942475A Expired - Lifetime EP0946828B1 (fr) 1997-10-22 1998-07-01 Systeme d'injection de carburant d'un moteur a combustion interne

Country Status (7)

Country Link
US (1) US6142107A (fr)
EP (1) EP0946828B1 (fr)
JP (1) JP2001506728A (fr)
KR (1) KR20000069637A (fr)
CN (1) CN1109815C (fr)
DE (2) DE19746491A1 (fr)
WO (1) WO1999020890A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2791400B1 (fr) * 1999-03-22 2002-04-26 Sofab Pompe a reaspiration
US7077101B2 (en) * 2002-08-14 2006-07-18 Electro-Motive Diesel, Inc. Hybrid fuel injection system
DE10337893A1 (de) * 2003-08-18 2005-03-17 Daimlerchrysler Ag Brennstoffeinspritzanlage und Verfahren zum Einspritzen von Brennstoff
DE602004013423T2 (de) * 2004-05-17 2009-06-04 Ford Global Technologies, LLC, Dearborn Kraftstoffverteilerkomponent
AU2007302597B2 (en) * 2006-09-25 2012-08-02 Dgc Industries Pty Ltd A dual fuel system
ES2360965T3 (es) * 2006-09-25 2011-06-10 Dgc Industries Pty Ltd Sistema de combustible dual.
CA2635410C (fr) * 2008-06-19 2010-08-17 Westport Power Inc. Double connecteur a carburants
FI123513B (fi) * 2010-12-02 2013-06-14 Waertsilae Finland Oy Polttoaineen syöttöyksikkö, menetelmä sen käyttämiseksi ja polttomoottori
US9068539B2 (en) * 2012-08-03 2015-06-30 Caterpillar Inc. Dual check fuel injector and fuel system using same
DE102012022498A1 (de) * 2012-11-19 2014-05-22 L'orange Gmbh Zweistoff-Injektor
US20160069310A1 (en) * 2014-09-09 2016-03-10 Avl Powertrain Engineering, Inc. Fuel injector with diesel pilot injection
DE102016000761A1 (de) 2016-01-27 2017-07-27 Roman TANIEL Emulgiersystem und Emulgierverfahren
DE102016203027A1 (de) * 2016-02-26 2017-08-31 Bayerische Motoren Werke Aktiengesellschaft Brennkraftmaschine
CN115305103A (zh) * 2022-06-30 2022-11-08 胡进 一种增强有机固废热裂解过程中表观传热系数的反应装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3931456A1 (de) * 1989-09-21 1991-04-04 Bosch Gmbh Robert Einspritzeinrichtung fuer dieselmotoren
US5355854A (en) * 1993-03-12 1994-10-18 Aubee Thomas A Supplemental gaseous fuel system for a diesel engine
DE4337048C2 (de) * 1993-10-29 1996-01-11 Daimler Benz Ag Kraftstoffeinspritzanlage für eine Brennkraftmaschine
DE19621297C1 (de) * 1996-05-28 1997-12-04 Man B & W Diesel Ag Einrichtung zur Steuerung/Regelung der Zündöl-Einspritzung eines Gasmotors
DE19625698B4 (de) * 1996-06-27 2005-09-22 Robert Bosch Gmbh Einspritzeinrichtung zum kombinierten Einspritzen von Kraftstoff und Zusatzflüssigkeit
US5890459A (en) * 1997-09-12 1999-04-06 Southwest Research Institute System and method for a dual fuel, direct injection combustion engine

Also Published As

Publication number Publication date
KR20000069637A (ko) 2000-11-25
US6142107A (en) 2000-11-07
DE59811107D1 (de) 2004-05-06
CN1109815C (zh) 2003-05-28
CN1242819A (zh) 2000-01-26
DE19746491A1 (de) 1999-04-29
EP0946828A1 (fr) 1999-10-06
JP2001506728A (ja) 2001-05-22
WO1999020890A1 (fr) 1999-04-29

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