WO2002079638A1 - Dispositif d'injection de carburant pour moteurs a combustion interne - Google Patents

Dispositif d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
WO2002079638A1
WO2002079638A1 PCT/DE2002/001109 DE0201109W WO02079638A1 WO 2002079638 A1 WO2002079638 A1 WO 2002079638A1 DE 0201109 W DE0201109 W DE 0201109W WO 02079638 A1 WO02079638 A1 WO 02079638A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
control
injection device
pressure
fuel injection
Prior art date
Application number
PCT/DE2002/001109
Other languages
German (de)
English (en)
Inventor
Achim Brenk
Wolfgang Klenk
Roland Bleher
Uwe Gordon
Manfred Mack
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
Priority to BR0204505-2A priority Critical patent/BR0204505A/pt
Priority to JP2002578021A priority patent/JP2004518897A/ja
Priority to EP02732356A priority patent/EP1373717A1/fr
Publication of WO2002079638A1 publication Critical patent/WO2002079638A1/fr

Links

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
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow
    • 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

Definitions

  • the invention is based on a fuel injection device according to the preamble of claim 1.
  • the injection valve has a two-stage hydraulic stroke stop which limits the opening stroke of the valve member and is designed as a hydraulic damping space with controllable relief.
  • the fuel in the damping chamber is pressed into a low-pressure chamber by two cuts on the valve member and via relief lines assigned to the cuts.
  • the sealing edge of the first bevel is formed closer to the combustion chamber than that of the second bevel, so that the sealing edge of the first bevel plunges into the bore as soon as a row of injection openings has emerged from the bore of the valve member.
  • the fuel in the damping chamber is routed exclusively via the second bevel and its relief line.
  • a hydraulically controlled relief valve is arranged in the relief line of the second bevel, which only opens when the pressure prevailing in the damping chamber exceeds the closing force of the closing spring acting on the valve member of the relief valve.
  • the closing spring is supported on one end face of an axially displaceable piston, the other end of which faces away from a hydraulic working space.
  • the piston and thus the closing force of the closing spring can be adjusted as a function of the operating characteristics of the internal combustion engine.
  • the Control pressure can thus be used to control how far the valve member emerges from the bore during the opening stroke movement and whether only one or both rows of injection openings are released.
  • the fuel injection device for internal combustion engines according to the invention with the characterizing features of claim 1 has the advantage that the hydraulic actuation of the Hubêtv ⁇ ntile takes place with low pressure and with the help of a single further control valve which can be switched via an actuator and can influence the pressure in the control line to the stroke control valve ,
  • the use of low pressure as a control variable has great advantages and reduces the control losses of the overall system or leads to an improvement in system efficiency. If the low pressure is taken from the discharge / quantity of the metering valves controlling the fuel metering of the injection valves, there is a further improvement in the overall efficiency.
  • control (pressure relief) of the injection valves The entire control quantity requirement can be covered by the control (pressure relief) of the injection valves.
  • FIG. 1 shows a first exemplary embodiment of a fuel injection device in a schematic overall illustration
  • FIG. 2 shows a second exemplary embodiment of a fuel injection device analogous to the representation in FIG. 1.
  • the first exemplary embodiment of a fuel injection device for internal combustion engines has a high-pressure fuel pump 2, which is connected on the suction side to a fuel tank 3 and on the pressure side to a high-pressure accumulator (common mail) 4. From this high-pressure accumulator 4, the high-pressure fuel is supplied via feed lines 5 to the individual pressure-controlled injection valves projecting into the combustion chamber of the internal combustion engine to be supplied
  • injectors 6 discharged, of which only one is shown in Fig. 1.
  • the injector 6 each have an electrically actuated metering valve 7 in the form of, for example, a 3/2-way valve.
  • the pressure in the high-pressure accumulator 4 is controlled by means of a 2/2-way solenoid valve 8, via which the high-pressure accumulator 4 is connected to the fuel 3, that is to say can be connected to the leak oil side.
  • the injection valve 6, which is designed as an A nozzle, comprises a piston-shaped valve member 11, which protrudes outward from the guide bore 10 of the valve housing against the action of a closing spring 9.
  • Two axially superimposed rows of spray holes 12, 13 are provided on the valve member 11 externally directed opening stroke of the valve member 11 can be opened in succession.
  • the spray holes 12, 13 are connected via longitudinal channels 14 in the valve member 11 to an annular pressure chamber 15, into which the supply line 5 opens into the injection valve 6.
  • the valve member 11 has a pressure shoulder 16, on which the fuel supplied via the supply line 5 in the opening direction (i.e. to the outside) on
  • Valve member 11 attacks.
  • the valve member 11 is provided at one end of a shaft 17, which at its other end carries a spring plate 18, on which the closing spring 9, which is supported at the other end on the valve housing, engages.
  • the stroke performed by the valve member 11 when opening is controlled by a hydraulic stroke stop 19.
  • the piston 20 provided for this purpose on the shaft 17 delimits with its one end a damping space 21 with two axially offset relief channels 22, 23, which are closed in succession during the opening stroke of the valve member 11.
  • the damping chamber 21 with the fuel tank 3, ie with the leakage, is connected via the first relief channel 22.
  • a hydraulically controllable, spring-loaded stroke control valve 24 (3/2-way valve) which, depending on the pressure prevailing in its control line 25, connects the damping chamber 21 with the fuel tank 3, ie with the Leakage oil side, or connects to a pressure accumulator 26.
  • the control lines 25 of the stroke control valves 24 are connected via a 3/2-way control valve 27 either to the pressure accumulator 26 or to the fuel tank 3, that is to say to the leakage oil side.
  • the control valve 27 can be actuated by an actuator in order to switch over the stroke control valves 24 of all the injection valves 6 at the same time.
  • the pressure accumulator 26 Via the metering valve 7 and a spring-loaded constant pressure or pressure regulating valve 28 provided therebetween (for example set to 60 bar), the pressure accumulator 26 can also be used
  • the fuel injection ie the opening stroke of the valve member 11, is initiated by energizing the metering valve 7.
  • the control pressure of the pressure accumulator 26 prevails in the control line 25, so that the stroke control valve 24 is switched against the spring force with the aid of this control pressure and, as shown in FIG. 1, the damping chamber 21 with the fuel tank 3 connects.
  • the valve member 11 opens, the fuel displaced by the piston 20 from the damping chamber 21 flows out via the second relief channel 23, so that a stroke limitation does not take place.
  • the 3/2-way control valve 27 when the 3/2-way control valve 27 is open, ie energized, the control line 25 is connected to the fuel tank 3 and is thus relieved, so that the stroke control valve 24 now connects the damping chamber 21 to the pressure accumulator 26.
  • the pressure accumulator 26 has a very small volume to ensure a precise stroke stop, but is so large that the valve member 11 does not vibrate. If, when the valve member 11 opens, the piston 20 closes the first relief channel 22 with its control edge 30, the fuel located in the damping chamber 21 is compressed by the piston 20. As a result, the opening stroke of the valve member 11 is hydraulically limited to a partial stroke of, for example, 50%, in which only the lower spray holes 12 are released for injection. In the fuel injection device shown in Fig. 2
  • control line 25 of the stroke control valves 24 can be connected to the fuel ank 3 via a 2/2-way control valve 32 and is connected to the pressure accumulator 26 via a throttle 33.

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)

Abstract

La présente invention concerne un dispositif d'injection de carburant (1) pour moteurs à combustion interne. Ce dispositif comprend une soupape d'injection (6) montée dans une conduite d'admission (5) de carburant pour chaque cylindre du moteur à combustion interne et une butée de course hydraulique (19), qui limite la course d'ouverture de l'élément de soupape (11) de la soupape d'injection (6), qui se présente sous forme d'enceinte d'amortissement hydraulique (21) et qui présente une soupape de commande de course (24) à commande hydraulique. Cette soupape de commande de course bloque la connexion de l'enceinte d'amortissement (21) au côté huile de fuite (3) en fonction de la pression qui règne dans sa ligne de commande (25). Selon cette invention, les lignes de commandes (25) des soupapes de commande de course (24) individuelles peuvent être connectées à un réservoir de basse pression (26) ou à un côté huile de fuite (3) par l'intermédiaire d'une unité de soupape de commande.
PCT/DE2002/001109 2001-03-29 2002-03-27 Dispositif d'injection de carburant pour moteurs a combustion interne WO2002079638A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR0204505-2A BR0204505A (pt) 2001-03-29 2002-03-27 Dispositivo de injeção de combustìvel para máquina de combustão interna
JP2002578021A JP2004518897A (ja) 2001-03-29 2002-03-27 内燃機関のための燃料噴射装置
EP02732356A EP1373717A1 (fr) 2001-03-29 2002-03-27 Dispositif d'injection de carburant pour moteurs a combustion interne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001115396 DE10115396A1 (de) 2001-03-29 2001-03-29 Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE10115396.1 2001-03-29

Publications (1)

Publication Number Publication Date
WO2002079638A1 true WO2002079638A1 (fr) 2002-10-10

Family

ID=7679457

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/001109 WO2002079638A1 (fr) 2001-03-29 2002-03-27 Dispositif d'injection de carburant pour moteurs a combustion interne

Country Status (5)

Country Link
EP (1) EP1373717A1 (fr)
JP (1) JP2004518897A (fr)
BR (1) BR0204505A (fr)
DE (1) DE10115396A1 (fr)
WO (1) WO2002079638A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008053873B4 (de) * 2008-10-30 2012-08-30 Vialle Alternative Fuel Systems B.V. Verbrennungskraftmaschine und Verfahren zum Betreiben einer Verbrennungskraftmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19618698A1 (de) * 1996-05-09 1997-11-13 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19739905A1 (de) * 1997-09-11 1999-03-18 Bosch Gmbh Robert Kraftstoffeinspritzventil
DE19900037A1 (de) * 1999-01-02 2000-07-06 Bosch Gmbh Robert Kraftstoffeinspritzventil
DE10100512A1 (de) * 2000-02-07 2001-08-09 Bosch Gmbh Robert Einspritzdüse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2260565B2 (de) * 1972-12-11 1975-11-13 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Verfahren und Einrichtung zum Mischen von Kunststoff oder Kautschuk in einem Zwei-Walzen-Mischwalzwerk
AT2960U3 (de) * 1998-07-02 1999-11-25 Avl List Gmbh Brennkraftmaschine mit direkter einspritzung
DE19939421A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kombiniertes hub-/druckgesteuertes Kraftstoffeinspritzverfahren und -system für eine Brennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19618698A1 (de) * 1996-05-09 1997-11-13 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19739905A1 (de) * 1997-09-11 1999-03-18 Bosch Gmbh Robert Kraftstoffeinspritzventil
DE19900037A1 (de) * 1999-01-02 2000-07-06 Bosch Gmbh Robert Kraftstoffeinspritzventil
DE10100512A1 (de) * 2000-02-07 2001-08-09 Bosch Gmbh Robert Einspritzdüse

Also Published As

Publication number Publication date
EP1373717A1 (fr) 2004-01-02
JP2004518897A (ja) 2004-06-24
DE10115396A1 (de) 2002-10-10
BR0204505A (pt) 2003-04-08

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