EP1898081A1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
EP1898081A1
EP1898081A1 EP07014373A EP07014373A EP1898081A1 EP 1898081 A1 EP1898081 A1 EP 1898081A1 EP 07014373 A EP07014373 A EP 07014373A EP 07014373 A EP07014373 A EP 07014373A EP 1898081 A1 EP1898081 A1 EP 1898081A1
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
injector
valve
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.)
Granted
Application number
EP07014373A
Other languages
German (de)
English (en)
Other versions
EP1898081B1 (fr
Inventor
Rene Böhm
Udo Kreissig
Peter Voigt
Danny Weigel
Christian Klüting
Christoph Kohnen
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP1898081A1 publication Critical patent/EP1898081A1/fr
Application granted granted Critical
Publication of EP1898081B1 publication Critical patent/EP1898081B1/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
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine, in particular of a motor vehicle, with an accumulator chamber (common rail) and an injector, in which an axially displaceable injection piston separates a control chamber from a pressure chamber, according to the preamble of patent claim 1.
  • the fuel pressure leads to the opening of the nozzle needle.
  • the opening pressure is determined by a Düsennadetfeder, which acts on the nozzle needle in the closing direction with force.
  • the opening pressure can be freely selected by the selection of the spring, but is set so.
  • An opening pressure must be suitable for all operating ranges of the internal combustion engine.
  • the invention has for its object to provide a fuel injection device og. To improve the type of function and operational safety.
  • a pressure in the control chamber of the injector in a force in the closing direction of the injection piston converting surface of the injection piston in the control chamber of the injector smaller than an effective, a pressure in the pressure chamber of the injector a force in the opening direction of the injection piston converting surface of the injection piston is.
  • a passive opening of the injector is possible in that the injection piston has a Balancierkolben, which projects into the control chamber of the injector, wherein the Balancierkolben a diameter d B , the injection piston at a pressure chamber side facing a diameter d E and arranged on the injection piston and through the pressure chamber in a valve seat cross-nozzle needle has a diameter d S , wherein Balancierkolben, injection piston and nozzle needle are formed such that the following condition is met, d B ⁇ d e 2 - d S 2 ,
  • a secure locking of the injection piston in the closed position is achieved in that the control chamber of the injector is permanently connected to the pressure accumulator space.
  • the pressure chamber is connected via a valve to the pressure accumulator chamber, wherein the valve connects the pressure chamber optionally with the accumulator chamber or separates from it.
  • valve being a 2/2-way valve.
  • the valve is a 3/2-way valve which connects the pressure chamber optionally with the pressure storage chamber or a leakage line.
  • a pressure booster in which an axially displaceable pressure booster piston separates an booster chamber, a spring chamber and a high-pressure chamber, is provided, the high-pressure chamber being connected to the connecting line between the pressure chamber of the injector and the pressure reservoir and the booster chamber being connected via a valve connected to the accumulator chamber.
  • the valve is for example a 3/2-way valve.
  • An additional adjustment of the closing pressure by means of resulting pressure modulations and / or by means of the pressure booster results from the fact that the control chamber of the injector is connected via a first check valve to the pressure accumulator space, wherein the first check valve closes in the direction of the accumulator chamber, and that the control chamber of the injector is connected via a second check valve to the high-pressure chamber of the pressure booster, wherein the second check valve closes in the direction of the high-pressure chamber.
  • the dargesteilte in Fig. 1, preferred embodiment of a fuel injection system according to the invention for an internal combustion engine comprises an injector 10, in which an axially displaceable injection piston 12 a control chamber 14 separates from a pressure chamber 16.
  • the injection piston 12 has a Balancierkolben 18, which projects into the control chamber 14, and a nozzle needle 20, which rises from a pressure chamber 16 of the injection piston 12 side, the pressure chamber 16 passes through and in the closed state of the injector 10 to a seat 22 is present.
  • the control chamber 14 is connected to a pressure accumulator space 24 (common rail).
  • the pressure chamber 16 is connected via a 2/2-way valve 26 to the accumulator chamber 24, wherein the 2/2-way valve 26 selectively connects the pressure chamber 16 with the accumulator chamber 24 or separates from this.
  • the opening pressure of the injector 10 is determined by the pressure around the control chamber 14 and the area of the balancing piston 18.
  • the opening pressure is a linear function of the fuel pressure and the surface of the Balancierkolbens 18.
  • the tuning problem of the nozzle opening pressure can be solved: At low load, a low pressure in the control chamber 14 is set to a low opening pressure for a small mechanical noise when closing the nozzle needle 20 to achieve. At high load, a high pressure in the control chamber 14 is adjusted to prevent back-blowing from a combustion chamber in a cylinder of the internal combustion engine as a result of high combustion pressures and to ensure rapid closing of the nozzle needle 20 in the seat 22.
  • the balancing piston 18 has a diameter d B 46.
  • the injection piston 12 has a diameter d E 48 at a side facing the pressure chamber 16.
  • the nozzle needle 20 has a diameter d S 50.
  • These respective diameters of Balancierkolben 18, injection piston 12 and nozzle needle 20 are formed such that the following condition is met: d B ⁇ d e 2 - d S 2 , This allows a passive opening of the injector 10. With an effective area here is meant a resulting surface, the pressure in the pressure chamber 16 and control chamber 14 in a on the Injection piston 12 acting, resulting force converts. To open the nozzle needle thus the pressure chamber 16 is acted upon by the pressure from the pressure storage chamber 24.
  • Fig. 2 shows a preferred interconnection of the fuel injection device wherein functionally identical parts are provided with the same reference numerals as in Fig. 1, so that reference is made to the explanation of the above description of FIG.
  • a pressure amplifier 28 is additionally provided, in which an axially displaceable pressure booster piston 30 an amplifier chamber 32, a spring chamber 34 and a high-pressure chamber 36 separates from each other.
  • the high-pressure chamber 36 is connected to the connecting line 38 between the pressure chamber 14 of the injector 10 and the accumulator chamber 24 upstream of the 2/2-way valve 26 and the booster chamber 32 is connected via a first 3/2-way valve 40 to the accumulator chamber 24.
  • the first 3/2-way valve 40 selectively connects the booster chamber 32 to the pressure storage space 24 to activate the pressure booster 28 or to a leak line 42 to deactivate the pressure booster 28.
  • the closing of the injector 10 can be actively supported even stronger by a pressure increase at the closing time of the 2/2-way valve 26, since the closing force on Balancierkolben 18 is proportional to the applied system pressure.
  • a corresponding connection (not shown) to provide the increased pressure from the high-pressure chamber 36 of the pressure booster 28 to the control chamber 14 of the injector 10 supplies.
  • the short line 38 between the 2/2-way valve 26 and the pressure chamber 16 of the injector 10 can be constructed with appropriate dimensioning (length shorter than 60 mm) no pressure wave, which would cause a second, unwanted opening of the injector 10.
  • Fig. 3 shows an alternative preferred. Connection of the fuel injection device, wherein functionally identical parts are provided with the same reference numerals as in FIGS. 1 and 2, so that reference is made to the explanation of the above description of FIGS. 1 and 2.
  • a second 3/2-way valve 44 is provided for controlling the pressure chamber 16, which connects the pressure chamber 16 selectively with the pressure storage chamber 24 or the leakage line 42. In non-activated state of the pressure chamber 16 is connected to the non-pressurized leakage line 42. If the injector 10 is actuated, a connection between the pressure accumulator chamber 24 and the pressure chamber 16 is established by the second 3/2-way valve 44.
  • the amount of fuel which has been diverted from the pressure chamber 16 is conveyed into a buffer store 54, which is arranged in the leakage line 42.
  • This buffer 54 is controlled by means of a pressure regulating valve 52.
  • the required amount of fuel from the pre-stored buffer 54 in the high-pressure chamber 36 and the spring chamber 34 is promoted. This avoids a leakage path during the injection and achieves a very good hydraulic efficiency in the pressure boosting. Steep Ab Kunststoffflanken can be achieved with the avoidance of unwanted post-injection.
  • Fig. 4 shows a further alternative preferred interconnection of the fuel injection device, wherein functionally identical parts are given the same reference numerals as in Figures 1 to 3, so that reference is made to the explanation of the above description of Figs. 1 to 3.
  • This embodiment corresponds to the embodiment of FIG. 3, wherein the control chamber 14 of the injector 10 is not, as in the embodiment of FIG. 3 is directly and permanently connected to the pressure storage chamber 24, but via a line 56 to an input of the 3/2 Directional valve 44.
  • the connection to the accumulator chamber 24 is carried out via a first check valve 58, wherein the first check valve 58 closes in the direction of the accumulator chamber 24.
  • control chamber 14 of the injector 10 is thereby connected via a second check valve 60 to the high-pressure chamber 36 of the pressure booster 28, wherein the second check valve 60 closes in the direction of the high-pressure chamber 36.
  • the control chamber 14 acts on the control chamber 14 not only the pressure in the pressure storage chamber 24 but also an optionally increased pressure of the pressure booster 28 in the high pressure chamber 36, if it is activated.
  • This makes it possible, for example, to use a resulting pressure modulation to set a closing pressure independent of the steady-state pressure in the pressure storage space 24. If the pressure booster 28 is active, this results in an increased closing pressure.

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)
EP07014373A 2006-08-22 2007-07-21 Dispositif d'injection de carburant Not-in-force EP1898081B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006039265A DE102006039265A1 (de) 2006-08-22 2006-08-22 Kraftstoffeinspritzvorrichtung

Publications (2)

Publication Number Publication Date
EP1898081A1 true EP1898081A1 (fr) 2008-03-12
EP1898081B1 EP1898081B1 (fr) 2009-04-15

Family

ID=38926115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07014373A Not-in-force EP1898081B1 (fr) 2006-08-22 2007-07-21 Dispositif d'injection de carburant

Country Status (3)

Country Link
EP (1) EP1898081B1 (fr)
AT (1) ATE428854T1 (fr)
DE (2) DE102006039265A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108869131B (zh) * 2018-07-25 2023-08-29 中国人民解放军海军工程大学 一种增压器及含有该增压器的超高压共轨系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4332119A1 (de) * 1993-09-22 1995-03-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE10326506A1 (de) * 2003-06-12 2005-01-05 Robert Bosch Gmbh Vorrichtung zum Einspritzen von Kraftstoff mit hubstabilisiertem Einspritzventilglied
DE10329704A1 (de) * 2003-07-02 2005-01-20 Robert Bosch Gmbh Kraftstoffeinspritzsystem und Verfahren zur Auslegung eines Kraftstoffeinspritzsystems
EP1605157A1 (fr) * 2004-06-11 2005-12-14 Robert Bosch GmbH Injecteur de carburant doté d'un élément de soupape d'injection en plusieurs parties et d'un amplificateur de pression
EP1612401A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Società Consortile per Azioni Système d'injection de carburant pour moteur à combustion interne

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19939448A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Injektor
DE19939421A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kombiniertes hub-/druckgesteuertes Kraftstoffeinspritzverfahren und -system für eine Brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4332119A1 (de) * 1993-09-22 1995-03-23 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
DE10326506A1 (de) * 2003-06-12 2005-01-05 Robert Bosch Gmbh Vorrichtung zum Einspritzen von Kraftstoff mit hubstabilisiertem Einspritzventilglied
DE10329704A1 (de) * 2003-07-02 2005-01-20 Robert Bosch Gmbh Kraftstoffeinspritzsystem und Verfahren zur Auslegung eines Kraftstoffeinspritzsystems
EP1605157A1 (fr) * 2004-06-11 2005-12-14 Robert Bosch GmbH Injecteur de carburant doté d'un élément de soupape d'injection en plusieurs parties et d'un amplificateur de pression
EP1612401A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Società Consortile per Azioni Système d'injection de carburant pour moteur à combustion interne

Also Published As

Publication number Publication date
DE502007000608D1 (de) 2009-05-28
ATE428854T1 (de) 2009-05-15
DE102006039265A1 (de) 2008-02-28
EP1898081B1 (fr) 2009-04-15

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