EP1867868B1 - Vanne d'injection de carburant dotée d'une soupape de commande de sécurité - Google Patents

Vanne d'injection de carburant dotée d'une soupape de commande de sécurité Download PDF

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Publication number
EP1867868B1
EP1867868B1 EP07107002A EP07107002A EP1867868B1 EP 1867868 B1 EP1867868 B1 EP 1867868B1 EP 07107002 A EP07107002 A EP 07107002A EP 07107002 A EP07107002 A EP 07107002A EP 1867868 B1 EP1867868 B1 EP 1867868B1
Authority
EP
European Patent Office
Prior art keywords
control
pressure
fuel injection
control valve
chamber
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.)
Not-in-force
Application number
EP07107002A
Other languages
German (de)
English (en)
Other versions
EP1867868A1 (fr
Inventor
Andreas Rettich
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1867868A1 publication Critical patent/EP1867868A1/fr
Application granted granted Critical
Publication of EP1867868B1 publication Critical patent/EP1867868B1/fr
Not-in-force 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
    • 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
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0073—Pressure balanced 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
    • 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
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2200/18—Fuel-injection apparatus having means for maintaining safety not otherwise provided for
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • Injectors for high-speed, self-igniting internal combustion engines which introduce the fuel directly into a combustion chamber of an internal combustion engine, have long been known from the prior art. So is from the disclosure DE 196 19 523 A1 an injection valve is known, which has a nozzle needle, the one or more injection openings by their longitudinal movement up and heading. Due to the pressure in a control chamber, a closing force is exerted indirectly via a valve piston on the nozzle needle, so that, if in the control chamber a correspondingly high fuel pressure is present, is held in its closed position. If an injection is to be made, the control chamber is connected to a leakage oil space by a ball valve controlled by an electromagnet lifts off the valve seat. The fuel pressure for the injection is provided here via a high-pressure accumulator, which is filled via a high-pressure fuel pump with fuel under high pressure.
  • the fuel injection valve according to the invention with the characterizing feature of claim 1 has the advantage that pressure peaks within the fuel injection valve quickly degraded and thus damage to this can be avoided.
  • the control valve is designed such that the movable control valve member is pressed against the force of a closing spring at an overpressure in the control chamber and the pressure is thus relaxed in a leakage oil space. This is done solely by the upcoming pressure in the control room, so that the solenoid otherwise moving solenoid does not need to be controlled. This pressure peaks can be broken down effectively and very quickly. It is also possible that the relief valve is omitted in the high-pressure accumulator and any occurring excessive pressure in the high-pressure accumulator instead is reduced via one or more of the connected fuel injection valves.
  • control valve member is in the form of a control sleeve which is slidably mounted on a control valve body.
  • a pressure stage is provided within the control sleeve, the for ensures that the control sleeve is lifted from the sealing seat when a certain limit pressure is exceeded, which is determined by the surface of the compression stage and the force of the closing spring, thereby causing a relief of the control chamber.
  • the sealing sleeve moves back onto the sealing seat and closes the control chamber against the leakage oil space. Therefore, there is no lowering of the fuel pressure in the control chamber below the prevailing in the high-pressure accumulator level, so that the fuel injection valve is ready for a fuel injection at any time.
  • control valve member is designed in the form of a control piston which is slidably mounted in a piston bore of the control valve body.
  • the annular groove is formed in this case in the control piston, thereby resulting in a resultant force on the control piston, which is directed away from the sealing seat.
  • the function is otherwise identical to that of the control valve sleeve.
  • FIG. 1 a fuel injection valve according to the invention with the fuel-supplying components is shown schematically in longitudinal section.
  • the fuel injection valve comprises a holding body 1 and a nozzle body 2, which are pressed against each other by a clamping nut 3.
  • a nozzle needle 10 is arranged longitudinally displaceable, which controls the opening of at least one injection opening 12 for their longitudinal movement.
  • the fuel is supplied to the injection openings 12 via a pressure chamber 14, which surrounds the valve needle 10 and which can be filled with fuel under high pressure via an inlet channel 15. If the valve needle 10 moves away from the injection openings 12 and thus moves into its open position, fuel will injected from the pressure chamber 14 via the injection openings 12 in a combustion chamber, not shown in the drawing of the internal combustion engine. On the other hand, if the valve needle 10 is in its closed position, that is to say in contact with a valve seat, then the injection openings 12 are closed by the valve needle 10.
  • a longitudinal bore 5 is formed, which is coaxial with the valve needle 10 and in which a valve piston 7 is arranged longitudinally displaceable.
  • the valve piston 7 abuts on the valve needle 10 via a pressure piece 19, so that it moves in the longitudinal direction synchronously with the valve needle 10.
  • At the nozzle body 2 facing the end of the valve piston 7 is surrounded by a spring 17 which is supported on the one hand in a paragraph in the holding body 1 and on the other hand on the pressure piece 19, so that by the force of the spring 17, the pressure piece 19 in the direction of the nozzle and thus the valve needle 10 is pressed into its closed position.
  • a high-pressure pump 6 For supplying the fuel under high pressure, a high-pressure pump 6 is provided, which compresses the fuel from a fuel tank 4 and a high-pressure accumulator 11, in which the fuel is kept under high pressure. Via a high pressure line 9 and a high pressure port 8, which is formed on the fuel injection valve, the high pressure fuel is supplied to the fuel injection valve and injected in the manner described via the injection ports 12 into the combustion chamber of the internal combustion engine.
  • control piston 7 With its end facing away from the nozzle 2, the control piston 7 defines a control chamber 20, which is connected to the inlet channel 15 via an inlet bore 21, in which an inlet throttle 22 is located.
  • the control chamber 20 is also connected via a longitudinal bore 28, which is formed in the holding body 1 and in a control valve body 27, with a leakage oil chamber 32.
  • the longitudinal bore 28 opens into a transverse bore 29, which in turn ends in an annular groove 34 which in FIG. 2 is shown in more detail.
  • the control valve 25 comprises a control valve member in the form of a control sleeve 30, which surrounds a piston-shaped portion of the control valve body 27 and is guided on this.
  • the control sleeve 30 is in this case longitudinally movable and is in its closed position on a sealing seat 33, so that the annular groove 34 is sealed against the leakage oil chamber 32.
  • the control sleeve 30 is acted upon by a closing spring 31, which exerts a closing force on the sealing sleeve 30 and thus presses against the sealing seat 33.
  • a closing spring 31 which exerts a closing force on the sealing sleeve 30 and thus presses against the sealing seat 33.
  • the sealing sleeve 30 can be lifted from the sealing seat 33, so that the annular groove 34 and thus via the transverse bore 29 and the longitudinal bore 28 and the control chamber 20 are connected to the leakage oil space.
  • a pressure stage 40 is formed, which causes by the pressure in the annular groove 34, a resultant hydraulic force acts on the control sleeve 30, which is directed away from the sealing seat 33.
  • the surface of the pressure stage 40 which is hydraulically effective in the opening direction and the force of the closing spring 31 are dimensioned so that when a limit pressure in the annular groove 34 is exceeded, the sealing sleeve 30 lifts off from the sealing seat 33 and the fuel present in the annular groove 34 in the Leakage oil room 32 relaxes. As soon as the pressure in the annular groove 34 again falls below the limiting pressure, the sealing sleeve 30 slides back into contact with the sealing seat 33.
  • the electromagnet 35 is energized and thereby pulls the sealing sleeve 30 away from the sealing seat 33. Thereby, the annular groove 34 is connected to the leakage oil chamber 32 by always a low fuel pressure prevails.
  • control sleeve 30 When overpressure occurs, for example in the inlet channel 15 due to pressure oscillations or due to other pressure surges that may occur, a pressure in the control chamber 20 that is higher than desired can occur. In this case, the control sleeve 30 will reduce the pressure in the manner described above, wherein the limit pressure on the size of the compression stage 40 and the spring force of the closing spring 31 can be adjusted.
  • FIG. 3 an alternative embodiment of the control valve 25 is shown.
  • a control piston 37 is provided here, which is guided in a piston bore 36.
  • the control piston 37 is also acted upon by a closing spring 31 and is pressed by this against a sealing seat 33.
  • a pressure stage 40 ' is provided, which is, however, formed on the inside of the piston bore 36.
  • control chamber 20 is identical to the function of the control sleeve 30, as they are in FIG. 2 shown and described above.
  • the connection of the control chamber 20 with the inlet bore 21 and the longitudinal bore 24 is slightly different than in the previous embodiment according to FIG. 2 , which is due to the changed geometry of the control valve 25. But here, too, the control chamber 20 is filled or relieved via an inlet bore 21 and a drain channel 24 with an outlet throttle 26 therein.

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  • 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 (9)

  1. Soupape d'injection de carburant pour moteurs à combustion interne, comprenant une aiguille de soupape (10), qui, par son déplacement longitudinal, commande l'ouverture d'au moins une ouverture d'injection (12), et comprenant un espace de commande (20) dont la pression agit au moins indirectement sur l'aiguille de soupape (10), l'espace de commande (20) pouvant être relié par un canal d'écoulement (28) à un espace de fuite d'huile (32), lequel canal d'écoulement (28) peut être ouvert ou fermé au moyen d'une soupape de commande (25), la soupape de commande (25) comprenant un organe de soupape de commande mobile (30 ; 37) et l'organe de soupape de commande (30 ; 37) étant pressé par une force de fermeture dans la direction d'un siège d'étanchéité (33), le canal d'écoulement (28) dans la soupape de commande (25) débouchant dans un espace annulaire (34) qui est limité par l'organe de soupape de commande (30 37), caractérisée en ce qu'un étage de pression (40; 40') est réalisé dans l'espace annulaire (34) de sorte qu'une force résultante s'exerce du fait de la pression hydraulique dans l'espace annulaire (34) sur l'organe de soupape de commande (30 ; 37) à rencontre de la force de fermeture, de sorte que lors d'un dépassement d'une, pression limite dans l'espace de commande (20), l'organe de soupape de commande (30 ; 37) se soulève du siège d'étanchéité (33) et relie l'espace annulaire (34) à l'espace de fuite d'huile (32).
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que l'organe de soupape de commande est réalisé en forme de douille de commande (30) et est monté de manière à pouvoir glisser sur un corps de soupape de commande (27).
  3. Soupape d'injection de carburant selon la revendication 2, caractérisée en ce que la rainure annulaire (34) est réalisée dans le corps de soupape de commande (27), la rainure annulaire (34) étant limitée vers l'extérieur par la douille de commande (30).
  4. Soupape d'injection de carburant selon la revendication 3, caractérisée en ce que l'étage de pression (40) est réalisé sur le côté intérieur de la douille de commande (30), de sorte que sous l'effet de la pression dans la rainure annulaire (34), une force résultante s'exerce sur la douille de commande (30) à l'encontre de la force de fermeture.
  5. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que l'organe de soupape de commande est réalisé sous forme de piston de commande (37) qui est monté de manière à pouvoir glisser dans un alésage de piston (36) d'un corps de soupape de commande (27).
  6. Soupape d'injection de carburant selon la revendication 5, caractérisée en ce que la rainure annulaire (34) est réalisée dans le piston de commande (37).
  7. Soupape d'injection de carburant selon la revendication 6, caractérisée en ce que l'étage de pression (40') est réalisé sur la paroi de l'alésage de piston (36), de sorte que, sous l'effet de la pression hydraulique dans la rainure annulaire (34), une force résultante s'exerce sur le piston de commande (37), laquelle est orientée à l'encontre de la force de fermeture.
  8. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 7, caractérisée en ce que la force de fermeture sur l'organe de soupape de commande (30 ; 37) est produite par un ressort de fermeture (31).
  9. Système d'injection de carburant comprenant une soupape d'injection de carburant selon l'une quelconque des revendications 1 à 8, et un accumulateur haute pression (11), dans lequel du carburant peut être conservé à haute pression, et qui est connecté par le biais d'une conduite haute pression (9) à l'espace de commande (20) d'au moins une soupape d'injection de carburant.
EP07107002A 2006-06-14 2007-04-26 Vanne d'injection de carburant dotée d'une soupape de commande de sécurité Not-in-force EP1867868B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006027485A DE102006027485A1 (de) 2006-06-14 2006-06-14 Kraftstoffeinspritzventil mit Sicherheitssteuerventil

Publications (2)

Publication Number Publication Date
EP1867868A1 EP1867868A1 (fr) 2007-12-19
EP1867868B1 true EP1867868B1 (fr) 2011-07-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07107002A Not-in-force EP1867868B1 (fr) 2006-06-14 2007-04-26 Vanne d'injection de carburant dotée d'une soupape de commande de sécurité

Country Status (3)

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EP (1) EP1867868B1 (fr)
AT (1) ATE517249T1 (fr)
DE (1) DE102006027485A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007037824A1 (de) 2007-08-10 2009-02-12 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102007037825A1 (de) 2007-08-10 2009-02-12 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102007040248A1 (de) 2007-08-27 2009-03-05 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102008005534A1 (de) * 2008-01-22 2009-07-23 Robert Bosch Gmbh Kraftstoffinjektor
DE102008001600A1 (de) * 2008-05-06 2009-11-12 Robert Bosch Gmbh Kraftstoff-Injektor mit einem eine Druckstufe aufweisenden Steuerventil
DE102009029355A1 (de) * 2009-09-10 2011-03-24 Robert Bosch Gmbh Injektor
DE102011090060A1 (de) * 2011-12-28 2013-07-04 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
CN116480506B (zh) * 2023-04-28 2025-06-27 中船动力研究院有限公司 喷射装置及发动机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9508623D0 (en) * 1995-04-28 1995-06-14 Lucas Ind Plc "Fuel injection nozzle"
DE10024662B4 (de) * 2000-05-18 2005-12-15 Siemens Ag Verfahren zum Betreiben eines Einspritzventils
DE10104618A1 (de) * 2001-02-02 2002-08-08 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE10163693A1 (de) * 2001-12-21 2003-07-10 Orange Gmbh Einspritzinjektor für Brennkraftmaschinen
US7278593B2 (en) * 2002-09-25 2007-10-09 Caterpillar Inc. Common rail fuel injector
EP1612403B1 (fr) * 2004-06-30 2007-01-10 C.R.F. Società Consortile per Azioni Soupape servo pour controller l'injecteur d'un moteur à combustion interne

Also Published As

Publication number Publication date
ATE517249T1 (de) 2011-08-15
EP1867868A1 (fr) 2007-12-19
DE102006027485A1 (de) 2007-12-20

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