EP1029172B1 - Unite de commande de valve destinee a une valve d'injection de carburant - Google Patents

Unite de commande de valve destinee a une valve d'injection de carburant Download PDF

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Publication number
EP1029172B1
EP1029172B1 EP99919056A EP99919056A EP1029172B1 EP 1029172 B1 EP1029172 B1 EP 1029172B1 EP 99919056 A EP99919056 A EP 99919056A EP 99919056 A EP99919056 A EP 99919056A EP 1029172 B1 EP1029172 B1 EP 1029172B1
Authority
EP
European Patent Office
Prior art keywords
valve control
control unit
valve
structural element
fuel
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
EP99919056A
Other languages
German (de)
English (en)
Other versions
EP1029172A1 (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 EP1029172A1 publication Critical patent/EP1029172A1/fr
Application granted granted Critical
Publication of EP1029172B1 publication Critical patent/EP1029172B1/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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M45/08—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats

Definitions

  • the invention relates to a valve control unit for a fuel injector, especially for one Common rail injector, according to the genus of Claim 1 (e.g. known from EP-A-0 686 763).
  • Such a valve control unit is, for example known from EP 0 661 442 A1.
  • Valve control units of this type are provided for the injection process for the pre and main injection of fuel (diesel fuel) at Control common rail injectors.
  • fuel diesel fuel
  • the Valve control unit is the pressurization of the one end of a slidable Valve control piston of the valve control unit affected.
  • the other end of the valve spool can be on one Act the nozzle needle so that the nozzle needle either an injection opening seals or the outlet of fuel from the injection port.
  • valve control unit Pressurization of the valve control piston Change in pressure conditions within a first Valve control room carried out via a Inlet channel with a high pressure accumulator (common rail) connected is.
  • a drain channel is opened, which is connected to a second one connected to the first valve control room Valve control room is connected. That's why it sinks Pressure in the first valve control room, and the hydraulic Force on the valve spool decreases.
  • a large volume with that Valve control piston connected end member are moved. Due to the lifting movement of the end member can Pre-injection is the amount of fuel injected cannot be minimized sufficiently.
  • valve control unit for a Fuel-. injection valve, especially for one Common rail injector, designed to minimize the amount pre-injected fuel and to increase the Speed of movement of the valve control piston characterizing features of claim 1.
  • the end member consists of an inner one and an outer member together. Both links are movable relative to each other and with the Valve control piston connected.
  • both components move together for a short stroke, while the Main injection just the inner member around you moved another stroke.
  • the Pre-injection due to the movement of the Valve control piston initially a larger volume Fuel through the end link (inner and outer Member) pushed out of the first valve control room must become.
  • the valve control piston can therefore only one Carry out a small stroke.
  • the pre-injected amount of This keeps fuel low.
  • the Main injection on the other hand, only moves the inner one Member of the end link, so that a smaller volume Fuel from the first valve control room must be pushed out.
  • the valve spool can therefore with increased movement speed and one larger stroke can be moved.
  • the first one Valve control room a first stop for limitation the movement of the outer member in the direction of the second valve control chamber and a second stop for Limiting the movement of the inner member in Direction of the second valve control room.
  • Valve control unit An embodiment of the invention Valve control unit is shown in the drawing and explained in the description below.
  • the figure shows a longitudinal section through a valve control unit according to the invention.
  • valve control unit 1 is in an idle state in which the Injection opening is closed, which is not in the figure is shown.
  • the valve control piston 5 has a End member 6, which is an inner member in the form of a Piston section 7 and an outer member in the form a control ring 8 comprises.
  • the piston portion 7 Concentric control ring 8 is slidable on one Outer peripheral surface 9 of the piston section 7 is arranged.
  • a compression spring 10 presses the control ring 8 with a Ring surface 11 against a counter surface 12.
  • a Mounting screw 13a is a mounting plate 13b firmly connected to the piston section 7 and facing Support of the compression spring 10 on the counter surface 11.
  • the Control ring 8 is therefore fastened under pretension.
  • a housing part 14 connected to the housing body 2 has a pressure chamber 15 which is connected to a high-pressure accumulator (common rail) via a connection channel 16.
  • the pressure chamber 15 has an inlet bore 17 through which fuel can escape.
  • Fuel can flow into the first valve control chamber 3 by means of an inlet channel in the form of an inlet throttle 18.
  • the inlet bore 17 enables high-pressure fuel (diesel fuel) to pressurize an underside 19 of the control ring 8. If a valve ball 20, which is part of a conventional solenoid valve (not shown in the figure), releases an outlet channel in the form of an outlet throttle 21, the pressure within the second valve control chamber drops. As a result, the pressure within the first valve control chamber 3 also decreases. Fuel can flow out in the direction of arrow 22.
  • the end member 6 with an outer diameter d 2 therefore initially shifts by the stroke h 1 .
  • the control ring 8 therefore comes into contact with the ring surface 11 on a wall surface 23 of the first valve control chamber 3. Because of the stop, the control ring 8 cannot move any further in the direction of the drain channel 21. Only a small amount of fuel is pre-injected.
  • the piston section 7 with an outer diameter d 1 can then additionally move by the stroke h G - h 1 .
  • the total stroke is denoted by h G.
  • a member of the end member 6, namely the piston section 7, moves with a cross-sectional area that is reduced in comparison to the total cross-sectional volume of the end member 6.
  • the piston section 7 can therefore move faster than the entire end member 6 with its greater structural extension. Overall, it is therefore achieved that a smaller amount of fuel is expelled during the pre-injection and that an increased movement speed of the valve control piston 5 is possible during the main injection.

Landscapes

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

Claims (5)

  1. Unité de commande de soupape pour un injecteur de carburant comportant deux chambres de commande d'injecteur (3, 4) reliées par un passage, avec dans la première chambre de commande (3) reliée à un canal d'alimentation (18) en carburant, un organe d'extrémité (6) d'un piston de commande (5) coulissant, et dans laquelle la seconde chambre de commande (4) est reliée à un canal de sortie (21) susceptible d'être fermé et l'organe d'extrémité se compose d'un élément intérieur (7) relié rigidement au piston de commande (5) et d'un élément extérieur (8) sollicité par un ressort de compression (10) en direction de la chambre (4), ces éléments pouvant coulisser l'un par rapport à l'autre,
    caractérisée en ce que
    le ressort de compression maintient l'élément extérieur (8) contre l'élément intérieur (7) et l'élément extérieur (8), après sa venue en appui, contre une première butée d'un corps (2) de l'unité de commande (2), peut être soulevé vis-à-vis de l'élément intérieur.
  2. Unité de commande de soupape selon la revendication 1,
    caractérisée en ce que
    les éléments (7, 8) sont concentriques l'un à l'autre.
  3. Unité de commande de soupape selon l'une des revendications précédentes,
    caractérisée en ce que
    l'élément intérieur (7) est un segment d'extrémité du piston de commande d'injecteur (5) formé par un passage en gradin entre un grand diamètre (d2) et un petit diamètre (d1) extérieur du piston de commande (5) et l'élément extérieur (8) est une bague de commande.
  4. Unité de commande de soupape selon l'une des revendications précédentes,
    caractérisée en ce que
    le corps (2) du boítier comporte une seconde butée pour limiter le mouvement de l'élément intérieur (7) en direction de la seconde chambre de commande (4).
  5. Unité de commande de soupape selon la revendication 4,
    caractérisée en ce que
    les butées sont réalisées dans la première chambre de commande d'injecteur (3).
EP99919056A 1998-06-16 1999-03-10 Unite de commande de valve destinee a une valve d'injection de carburant Expired - Lifetime EP1029172B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19826791A DE19826791A1 (de) 1998-06-16 1998-06-16 Ventilsteuereinheit für ein Kraftstoffeinspritzventil
DE19826791 1998-06-16
PCT/DE1999/000641 WO1999066193A1 (fr) 1998-06-16 1999-03-10 Unite de commande de valve destinee a une valve d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1029172A1 EP1029172A1 (fr) 2000-08-23
EP1029172B1 true EP1029172B1 (fr) 2003-09-03

Family

ID=7871039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99919056A Expired - Lifetime EP1029172B1 (fr) 1998-06-16 1999-03-10 Unite de commande de valve destinee a une valve d'injection de carburant

Country Status (7)

Country Link
US (1) US6244245B1 (fr)
EP (1) EP1029172B1 (fr)
JP (1) JP2002518630A (fr)
CN (1) CN1158456C (fr)
CZ (1) CZ293709B6 (fr)
DE (2) DE19826791A1 (fr)
WO (1) WO1999066193A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1163440B1 (fr) * 1999-03-18 2005-10-05 Delphi Technologies, Inc. Injecteur de carburant
DE19945314A1 (de) * 1999-09-22 2001-04-05 Bosch Gmbh Robert Common-Rail-Injektor
DE19963920B4 (de) * 1999-12-31 2005-01-13 Robert Bosch Gmbh Injektor für ein Common-Rail-Kraftstoffeinspritzsystem mit schiebergesteuertem Zulaufkanal und direkter Kopplung von Steuerkolben und Düsenkanal
DE10015268A1 (de) 2000-03-28 2001-10-04 Siemens Ag Einspritzventil mit Bypaßdrossel
DE10031580A1 (de) * 2000-06-29 2002-01-17 Bosch Gmbh Robert Druckgesteuertes Steuerteil für Common-Rail-Injektoren
DE10055267B4 (de) * 2000-11-08 2004-07-29 Robert Bosch Gmbh Druckgesteuerter Injektor für Hocheinspritzung mit Schieberdrosseln
JP3527214B2 (ja) * 2001-04-26 2004-05-17 株式会社日本自動車部品総合研究所 燃料噴射弁
DE10122256A1 (de) 2001-05-08 2002-11-21 Bosch Gmbh Robert Kraftstoff-Einspritzvorrichtung für Brennkraftmaschinen, insbesondere Common-Rail-Injektor, sowie Kraftstoffsystem und Brennkraftmaschine
DE10154802A1 (de) * 2001-11-08 2003-05-22 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10211439A1 (de) * 2002-03-15 2003-10-02 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
US7334741B2 (en) * 2005-01-28 2008-02-26 Cummins Inc. Fuel injector with injection rate control
DE102006034112A1 (de) * 2006-07-24 2008-01-31 Robert Bosch Gmbh Kraftstoffinjektor
US7748445B2 (en) * 2007-03-02 2010-07-06 National Oilwell Varco, L.P. Top drive with shaft seal isolation
WO2014193356A1 (fr) * 2013-05-29 2014-12-04 International Engine Intellectual Property Company, Llc Injecteur de carburant
JP6642478B2 (ja) * 2017-02-22 2020-02-05 株式会社デンソー 燃料噴射装置
DE102018212665A1 (de) * 2018-07-30 2020-01-30 Robert Bosch Gmbh Kolbenpumpe und Kraftstofffördereinrichtung für kryogene Kraftstoffe

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH495504A (de) * 1968-08-28 1970-08-31 Sopromi Soc Proc Modern Inject Brennstoff-Einspritzventil mit elektromagnetischer Betätigung
DE1808650A1 (de) * 1968-11-13 1970-06-18 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung
US4640252A (en) * 1984-01-28 1987-02-03 Mazda Motor Corporation Fuel injection system for diesel engine
IT1261149B (it) * 1993-12-30 1996-05-09 Elasis Sistema Ricerca Fiat Valvola di dosaggio per il comando dell'otturatore di un iniettore di combustibile
DE59506715D1 (de) * 1994-06-06 1999-10-07 Ganser Hydromag Brennstoffeinspritzventil für Verbrennungskraftmaschinen
GB9507115D0 (en) * 1995-04-06 1995-05-31 Lucas Ind Plc Fuel pumping apparatus
FI101739B1 (fi) * 1996-08-16 1998-08-14 Waertsila Nsd Oy Ab Ruiskutusventtiilijärjestely
JP3823391B2 (ja) * 1996-08-31 2006-09-20 いすゞ自動車株式会社 エンジンの燃料噴射装置
GB9713791D0 (en) * 1997-07-01 1997-09-03 Lucas Ind Plc Fuel injector
GB9714647D0 (en) * 1997-07-12 1997-09-17 Lucas Ind Plc Injector
DE19816316A1 (de) * 1998-04-11 1999-10-14 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen

Also Published As

Publication number Publication date
CZ2000116A3 (cs) 2001-01-17
US6244245B1 (en) 2001-06-12
CN1272163A (zh) 2000-11-01
EP1029172A1 (fr) 2000-08-23
DE59906857D1 (de) 2003-10-09
WO1999066193A1 (fr) 1999-12-23
CN1158456C (zh) 2004-07-21
DE19826791A1 (de) 1999-12-23
CZ293709B6 (cs) 2004-07-14
JP2002518630A (ja) 2002-06-25

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