EP1892409A2 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
EP1892409A2
EP1892409A2 EP07014372A EP07014372A EP1892409A2 EP 1892409 A2 EP1892409 A2 EP 1892409A2 EP 07014372 A EP07014372 A EP 07014372A EP 07014372 A EP07014372 A EP 07014372A EP 1892409 A2 EP1892409 A2 EP 1892409A2
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
injector
booster
piston
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
EP07014372A
Other languages
German (de)
English (en)
Other versions
EP1892409A3 (fr
EP1892409B1 (fr
Inventor
Christian Klüting
Christoph Kohnen
Rene Böhm
Udo Kreissig
Peter Voigt
Danny Weigel
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 EP1892409A2 publication Critical patent/EP1892409A2/fr
Publication of EP1892409A3 publication Critical patent/EP1892409A3/fr
Application granted granted Critical
Publication of EP1892409B1 publication Critical patent/EP1892409B1/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
    • 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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine, in particular a motor vehicle, with a pressure accumulator space (common rail) and an injector in which an axially displaceable injection piston separates a control chamber from a pressure chamber, a leakage line, a pressure booster, in which an axially displaceable pressure booster piston Amplifier space, a spring chamber and a high-pressure chamber from each other, and a connecting line which connects the pressure accumulator space with the pressure chamber of the injector, according to the preamble of claim 1.
  • the invention further relates to a method for operating a fuel injection device, wherein at the end of an injection process from a pressure chamber an amount of fuel is diverted into a leakage line of an injector, according to the preamble of claim 8.
  • the fuel injection system for the intermittent supply of fuel in combustion chambers of an internal combustion engine known.
  • the fuel injection system comprises electrically operated injection valves for each cylinder of the internal combustion engine and a common rail pressure accumulator acted upon by a continuously conveying fuel pump, from which a line with a buffer leads to an annular space in each injection valve.
  • a solenoid valve controls a valve member that releases injection ports in the injector.
  • the buffer is equipped with a device for volume change, which is controlled by a map control of the internal combustion engine, so that in certain load points, a positive influence of the mixture formation is achieved with low pressure increase rates dp / dt.
  • a large volume of the buffer With a large volume of the buffer, a rapid increase in pressure can be achieved because the pressure drop at the beginning of the injection is small. With a small volume of the buffer, a flat increase in pressure can be achieved because the pressure drop at the beginning of the injection is large.
  • a small volume of the buffer can be set, so that low pressure increase speeds dp / dt are achieved.
  • the device for volume change is actuated by a characteristic map control of the internal combustion engine, so that an optimum for each operating point of the internal combustion engine volume of the buffer and thus optimal injection rate shaping is achieved.
  • the invention has for its object to improve a fuel injection device of the type mentioned above in terms of hydraulic efficiency.
  • a fuel injection device of the o.g. Art provided according to the invention that the high-pressure chamber of the pressure booster via a first check valve which locks in the direction of the leakage line, the spring chamber of the pressure intensifier permanently with the leakage line and the booster chamber of the booster with a first 3/2-way valve, which the booster chamber of the booster with optional the pressure accumulator space or the leakage line connects, wherein a second 3/2-way valve is provided in the connecting line between pressure accumulator and pressure chamber of the injector, which connects the pressure chamber of the injector with either the pressure accumulator space or the leakage line, wherein in the leakage line a buffer and a pressure regulating valve is arranged.
  • a passive opening of the injector is possible in that the injection piston has a Balancierkolben, softer projects into the control chamber of the injector, wherein the Balancierkolben a diameter d B , the injection piston on 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-sectional 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 high-pressure chamber of the pressure booster via a second check valve, which blocks in the direction of the high-pressure chamber, connected to the connecting line between the pressure accumulator and the pressure chamber of the injector upstream of the second 3/2-way valve.
  • a third check valve is arranged in the connecting line upstream of the second 3/2-way valve, which blocks in the direction of the accumulator chamber.
  • the discarded amount of fuel stored in a buffer under a pressure which is greater than a leakage pressure and fed to reload a booster to a spring chamber and a high-pressure chamber of the booster.
  • the pressure in the buffer is adjusted via a pressure regulating valve.
  • a 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 separates a control chamber 14 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 facing the pressure chamber 16 passes through and in the closed state of the injector 10 at a seat 22nd is applied.
  • the control chamber 14 is connected to a pressure accumulator space 24 (common rail).
  • the pressure chamber 16 is connected via a connecting line 38 and a second 3/2-way valve 44 to the accumulator chamber 24, wherein the 3/2-way valve 44 selectively connects the pressure chamber 16 with the accumulator chamber 24 or a leakage line 42.
  • the opening pressure of the injector 10 is determined by the pressure in 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 low 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 20 thus the pressure chamber 16 is acted upon by the pressure from the pressure storage chamber 24.
  • a pressure booster 28 is provided, in which an axially displaceable pressure booster piston 30 a booster 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 connected to the second 3/2-way valve 44 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 high-pressure chamber 36 of the pressure intensifier 28 is connected via a first check valve 56, which blocks in the direction of the leakage line 42, the spring chamber 34 of the pressure intensifier 28 is permanently connected to the leakage line 42 and the booster chamber 32 of the pressure booster 28 with the first 3/2-way valve 40, which connects the booster chamber 32 of the booster 28 selectively with the pressure storage chamber 24 or the leakage line 42 connected.
  • the high-pressure chamber 36 of the pressure booster 28 is connected via a second check valve 58, which blocks in the direction of the high-pressure chamber 36, with the connecting line 38 between the pressure accumulator 24 and the pressure chamber 16 of the injector 10 upstream of the second 3/2-way valve 44.
  • a third check valve 60 is further arranged, which blocks in the direction of the pressure storage chamber 24.
  • the closing of the injector 10 can be actively supported even stronger by a pressure increase at the closing time of the second 3/2-way valve 44, 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 3/2-way valve 44 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.
  • 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 closing of the nozzle needle 20 at the end of an injection process is accelerated by the fact that on the bottom, ie, the pressure chamber 16 side facing the injection piston 12 only leak oil pressure (essentially without pressure) is applied. In this case, even with a large distance between the pressure chamber 16 and the second 3/2-way valve 44, re-injection is not possible in order to achieve a rapid response of the injection course to the movement of the second 3/2-way valve 44 and to ensure good efficiency (compression losses ) is also a short line advantageous.
  • the quantity 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 is conveyed from the temporary store 54 in the high-pressure chamber 36 and the spring chamber 34. 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.

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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)
EP07014372A 2006-08-22 2007-07-21 Dispositif d'injection de carburant Not-in-force EP1892409B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006039263A DE102006039263A1 (de) 2006-08-22 2006-08-22 Kraftstoffeinspritzvorrichtung

Publications (3)

Publication Number Publication Date
EP1892409A2 true EP1892409A2 (fr) 2008-02-27
EP1892409A3 EP1892409A3 (fr) 2009-05-27
EP1892409B1 EP1892409B1 (fr) 2010-12-15

Family

ID=38669644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07014372A Not-in-force EP1892409B1 (fr) 2006-08-22 2007-07-21 Dispositif d'injection de carburant

Country Status (3)

Country Link
EP (1) EP1892409B1 (fr)
AT (1) ATE491883T1 (fr)
DE (2) DE102006039263A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019243020A1 (fr) * 2018-06-19 2019-12-26 Rklab Ag Appareil injecteur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014210779A1 (de) 2014-06-05 2015-12-17 Volkswagen Aktiengesellschaft Kraftstoffeinspritzvorrichtung
DE102020212697B4 (de) 2020-10-08 2022-08-25 Ford Global Technologies, Llc Injektor, Dieselmotor und Kraftfahrzeug

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19512270A1 (de) 1995-04-01 1996-09-26 Mtu Friedrichshafen Gmbh Kraftstoffeinspritzanlage für Brennkraftmaschine
DE19939421A1 (de) 1999-08-20 2001-03-01 Bosch Gmbh Robert Kombiniertes hub-/druckgesteuertes Kraftstoffeinspritzverfahren und -system für eine Brennkraftmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19910970A1 (de) * 1999-03-12 2000-09-28 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
DE19939448A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Injektor
DE10164395A1 (de) * 2001-12-28 2003-07-17 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19512270A1 (de) 1995-04-01 1996-09-26 Mtu Friedrichshafen Gmbh Kraftstoffeinspritzanlage für Brennkraftmaschine
DE19939421A1 (de) 1999-08-20 2001-03-01 Bosch Gmbh Robert Kombiniertes hub-/druckgesteuertes Kraftstoffeinspritzverfahren und -system für eine Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019243020A1 (fr) * 2018-06-19 2019-12-26 Rklab Ag Appareil injecteur
US11459990B2 (en) 2018-06-19 2022-10-04 Rklab Ag Injector apparatus

Also Published As

Publication number Publication date
EP1892409A3 (fr) 2009-05-27
DE502007005929D1 (de) 2011-01-27
ATE491883T1 (de) 2011-01-15
EP1892409B1 (fr) 2010-12-15
DE102006039263A1 (de) 2008-03-06

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