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WO2002055869A1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

Info

Publication number
WO2002055869A1
WO2002055869A1 PCT/DE2001/004796 DE0104796W WO02055869A1 WO 2002055869 A1 WO2002055869 A1 WO 2002055869A1 DE 0104796 W DE0104796 W DE 0104796W WO 02055869 A1 WO02055869 A1 WO 02055869A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
injection device
fuel injection
chamber
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.)
Ceased
Application number
PCT/DE2001/004796
Other languages
German (de)
English (en)
Inventor
Wolfgang Braun
Bernd Mahr
Martin Kropp
Hans-Christoph Magel
Wolfgang Otterbach
Heinz-Bernd Haiser
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
Priority claimed from DE10133490A external-priority patent/DE10133490A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2002055869A1 publication Critical patent/WO2002055869A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • 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 according to the preamble of patent claim 1.
  • the fuel injection device according to the invention is stroke-controlled.
  • a stroke-controlled fuel injection device is understood to mean that the opening and closing of the injection opening takes place with the aid of a displaceable valve member due to the hydraulic interaction of the fuel pressures in a nozzle chamber and in a control chamber.
  • a pressure drop within the control chamber causes the valve member to lift.
  • the valve member can be deflected by a steep member (actuator, actuator).
  • a valve-controlled injection unit is understood to be an injector which is screwed in the cylinder head '. Injectors of the injectors open with the help of hydraulic amplification when the fuel flow is released via the valve. They inject the fuel directly into the engine's combustion chambers.
  • injection pressure The pressure at which fuel emerges from the nozzle chamber into a cylinder of an internal combustion engine
  • system pressure is understood to mean the pressure at which fuel is available or is stored within the fuel injection device.
  • Fuel metering means to provide a defined amount of fuel for injection. Leakage is to be understood as an amount of fuel that arises during operation of the fuel injection device (for example a guide leakage), is not used for injection and is returned to the fuel tank. The pressure level of this leakage can have a static pressure, the fuel then being expanded to the pressure level of the fuel tank.
  • a high injection pressure is required to reduce emissions and achieve high specific outputs.
  • the achievable pressure level from the pressure storage space is limited, so that the use of a pressure booster is required.
  • Such a fuel injection device has become known from DE 799 10 970 A1.
  • a fuel injection device In order to minimize the pressure level in the control chamber of a stroke-controlled fuel injection device and to improve the high pressure resistance, a fuel injection device is proposed. Due to this hydraulic connection and the design of the pressure surface of the control room, the low, non-increased rail pressure can also be used to control the nozzle needle. This has the advantage that the pressure level in the control room drops sharply and there are no problems with the high pressure resistance of the control room. Furthermore, the sealing of the control room is facilitated and a larger guide bar! enabled on the pressure piston.
  • the coaxial arrangement of the pressure booster around the nozzle needle and the control rod results in a very compact design of the injector. This is mandatory for installation in modern engines. With this design, the high pressure for injection is generated directly at the nozzle needle and does not have to be routed through holes. This reduces the high pressure volume to a minimum. This increases the efficiency of the Fuel injector. The number of high pressure components. minimized. Through a multi-part design of the nozzle needle control by means of a piston and a push rod, double guidance or tensioning of the piston is avoided and a possible minimal offset between the guided components is compensated for.
  • FIG. 3 shows an enlarged detail of the injector according to FIG. 2;
  • FIG. 4 shows an enlarged detail of the injector according to FIG. 2.
  • a fuel pump 2 delivers fuel from a storage tank 3 via a delivery line 4 into a central pressure storage chamber 5, from which a plurality of pressure lines 6, corresponding to the number of individual cylinders, to the individual ones, to the combustion chamber remove supplying internal combustion engine protruding injection nozzles 7.
  • a system pressure is generated and stored in the pressure storage chamber 5 with a first, average system pressure. This first system pressure is used for pre-injection and if necessary and post-injection (HC enrichment for exhaust gas aftertreatment or soot reduction) as well as to show a peak course with plateau (boat injection).
  • each injection nozzle 7 is assigned a local pressure booster 8.
  • the pressure booster 8 can be controlled via a 2/2-way valve 9.
  • a primary chamber 10 is connected to the pressure line 6, so that a piston 11 ' is pressurized at one end.
  • a differential space 12 is relieved of pressure by means of a leakage line 13 when the valve 9 is open, so that the piston 11 can be moved to reduce the volume of a pressure chamber 14.
  • the piston 11 is moved in the compression direction, so that the fuel located in the pressure chamber 14 compresses and is fed to a nozzle chamber 15 of the injection nozzle 7.
  • a check valve 16 prevents the backflow of compressed fuel into the pressure storage chamber 5.
  • a control chamber 17 of the injection nozzle 7 is also connected to the pressure line 6.
  • a second higher pressure can be generated by means of a suitable area ratio in the primary chamber 10 and the pressure chamber 14.
  • the injection takes place via a stroke-controlled Kra tstoffzuunk with the aid of a nozzle needle 18 axially displaceable in a guide bore with a conical valve sealing surface at its one ' end, with which it cooperates with a valve seat on the housing of the injector 7.
  • a pressure surface 19 pointing in the opening direction of the nozzle needle 18. exposed to the pressure prevailing there, which is supplied to the nozzle chamber 15 via a pressure line 20.
  • a pressure piece 22 also acts on the nozzle needle 18, which has its end face (pressure surface 23) facing away from the valve sealing surface. limited the control room 17.
  • the control chamber 17 From the fuel pressure connection, the control chamber 17 has an inlet with a first throttle 24 and an outlet to a leakage line 25 with a second throttle 26, which is controlled by a 2/2-way valve 27.
  • the low, untranslated rail pressure can also be used to control the nozzle needle 18.
  • the pressure piece 22 is pressurized in the closing direction by the pressure in the control chamber 17.
  • Fuel under the first or second system pressure constantly fills the nozzle chamber 1 5.
  • Fuel under the first system pressure fills the control chamber 17 when the valve 27 is closed.
  • the pressure in the control chamber 17 can be reduced so that the pressure force acting in the opening direction on the nozzle needle 18 in the nozzle space 19 exceeds the pressure force acting in the closing direction on the valve member 18.
  • the valve sealing surface lifts off the valve seat surface and fuel is injected.
  • the pressure relief process of the control chamber 17 and thus the stroke control of the nozzle needle 18 can be influenced via the dimensioning of the throttle 24 and the throttle 26.
  • the end of the injection is initiated by deactivating (closing) the 2/2-way valve 27, as a result of which the control chamber 17 is again decoupled from the leakage line 25, so that a pressure builds up again in the control chamber 17, which pressure element 22 in the closing direction can move.
  • the pressure booster is deactivated by closing valve 9.
  • valve 9 When the valve 9 is closed, the first system pressure builds up in the differential space 12 via a throttle. As a result, the piston 1 1 is pressure-balanced and there is no pressure amplification.
  • the piston 1 1. is returned to its initial position by spring force. - To accelerate the resetting, a filling valve can be provided which, after the pressure has built up in the differential space 1 2, releases a larger flow cross-section: between the primary chamber 1 0 and the differential space 1 2.
  • the valve units can be actuated, for example, by electromagnets or piezo actuators for opening, closing or switching.
  • the actuators are controlled by a control device, ... monitor the various Bet ⁇ 'ebsparameter ⁇ engine speed) of the internal combustion engine to be supplied and can process.
  • 2 shows the construction of the injector 7 with a high-pressure connection 28.
  • the pressure booster comprises the stepped piston 11 on which the primary chamber 10, the differential chamber 12 and the pressure chamber 14 are formed.
  • the stepped piston 11 is axially displaceable and arranged coaxially with the nozzle needle 18 and the control rod (pressure piece) 22.
  • the nozzle needle 18 is controlled via the piston 33 and the control rod 22.
  • the primary chamber 10 is connected to the high-pressure connection 28.
  • the pressure chamber 14 is filled with fuel from the pressure storage space via the check valve 16.
  • the differential space 12 is connected to the pressure storage space via a throttle 30 and can be connected to the return via a bore 31 and the valve 9.
  • the valve 9 closes the bore 31.
  • all the rooms or chambers adjoining the stepped piston 11 are subjected to rail pressure.
  • the stepped piston 1 1 is pressure-balanced. There is no pressure boost.
  • the stepped piston 11 is returned to its upper starting position by a return spring 32.
  • the nozzle needle 18 is acted upon by the control rod 22 and a piston 33 with the pressure force from the control chamber 17, so that the injection opening is closed.
  • the control room 17 is connected to the pressure line via the. Inlet throttle 24.
  • the control chamber 17 can be connected to the return via the outlet throttle 26 and the valve 27.
  • the control rod 22 is arranged in an inner bore 34 of the stepped piston 11.
  • a seal 35 closes off the pressure chamber 14 from the stepped piston 11 and the nozzle needle 18, so that the pressure in the pressure chamber 14 cannot get into the inner bore 34 (see also FIG. 4).
  • the seal has a guide with respect to the nozzle needle 18 and a sealing surface with respect to the stepped piston 11.
  • the sealing force of the seal 35 is pressed onto the stepped piston 11 by a spring 36 and a hydraulic pressure force from a pressure surface in the pressure chamber 14.
  • the axial sealing surface can have a molded sealing edge.
  • Another seal 37 closes the primary chamber 10 and a working space 38 of the piston 33 (see FIG. 3). in the idle state, the valves 9 and 27 are closed. The opening of the injection nozzle is also closed and there is no injection.
  • the stepped piston is pressure balanced so that there is no pressure boost. The injection is effected by the hydraulically controlled nozzle needle 18, which is held in the closed position by the pressure in the control chamber 17.
  • valve 27 If the valve 27 is activated and the throttle 26 is connected to the return, then the pressure in the control chamber 17 drops and the nozzle needle 18 releases the opening. If the valve 27 is deactivated and thus closed, rail pressure builds up again in the control chamber 17 and the nozzle needle 18 closes the opening.
  • valve 9 To activate the pressure boost, valve 9 opens and connects differential chamber 1 2 (pressure booster control chamber) to the return. Therefore, the pressure in the differential space 1 2 drops sharply. The stepped piston 1 1 is now no longer pressure-balanced and fuel is compressed in the pressure chamber 14. To deactivate the pressure boosting, the valve 9 is closed and the connection from the differential space 1 2 to the return line is interrupted. Then rail pressure builds up again in the differential space 12 and the pressure boosting is ended.
  • differential chamber 1 2 pressure booster control chamber

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

L'invention concerne un dispositif d'injection de carburant (1) à course commandée composé d'une chambre d'accumulation de pression (5), d'une chambre primaire (10), d'un multiplicateur de pression (8) comportant une chambre primaire (10) et une chambre de pression (14), et d'un injecteur (7) comportant une chambre d'injecteur (15) et une chambre de commande (17). La chambre de pression est reliée à la chambre d'injecteur (15). La chambre primaire (10) et la chambre de commande (17) sont reliées par l'intermédiaire d'une conduite d'alimentation extrayant du carburant dont la pression n'est pas amplifiée hors de la chambre d'accumulation de pression (5).
PCT/DE2001/004796 2001-01-12 2001-12-19 Dispositif d'injection de carburant Ceased WO2002055869A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10101105 2001-01-12
DE10101105.9 2001-01-12
DE10133490A DE10133490A1 (de) 2001-01-12 2001-07-10 Kraftstoffeinspritzeinrichtung
DE10133490.7 2001-07-10

Publications (1)

Publication Number Publication Date
WO2002055869A1 true WO2002055869A1 (fr) 2002-07-18

Family

ID=26008215

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/004796 Ceased WO2002055869A1 (fr) 2001-01-12 2001-12-19 Dispositif d'injection de carburant

Country Status (1)

Country Link
WO (1) WO2002055869A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006013151A1 (fr) * 2004-08-03 2006-02-09 Robert Bosch Gmbh Procede et dispositif pour la reduction de pression de rampe dans un systeme d'injection a rampe d'alimentation commune
US7047941B2 (en) 2002-05-03 2006-05-23 Delphi Technologies, Inc. Fuel injection system
US7404393B2 (en) 2002-07-04 2008-07-29 Delphi Technologies, Inc. Fuel injection system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516730A (en) * 1982-07-28 1985-05-14 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
DE4118237A1 (de) * 1990-06-08 1991-12-12 Avl Verbrennungskraft Messtech Einspritzsystem fuer brennkraftmaschinen
US5413076A (en) * 1993-04-08 1995-05-09 Robert Bosch Gmbh Fuel injection system for internal combustion engines
US6073862A (en) * 1998-09-16 2000-06-13 Westport Research Inc. Gaseous and liquid fuel injector
US6113000A (en) * 1998-08-27 2000-09-05 Caterpillar Inc. Hydraulically-actuated fuel injector with intensifier piston always exposed to high pressure actuation fluid inlet
DE19910970A1 (de) 1999-03-12 2000-09-28 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516730A (en) * 1982-07-28 1985-05-14 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
DE4118237A1 (de) * 1990-06-08 1991-12-12 Avl Verbrennungskraft Messtech Einspritzsystem fuer brennkraftmaschinen
US5413076A (en) * 1993-04-08 1995-05-09 Robert Bosch Gmbh Fuel injection system for internal combustion engines
US6113000A (en) * 1998-08-27 2000-09-05 Caterpillar Inc. Hydraulically-actuated fuel injector with intensifier piston always exposed to high pressure actuation fluid inlet
US6073862A (en) * 1998-09-16 2000-06-13 Westport Research Inc. Gaseous and liquid fuel injector
DE19910970A1 (de) 1999-03-12 2000-09-28 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7047941B2 (en) 2002-05-03 2006-05-23 Delphi Technologies, Inc. Fuel injection system
US7404393B2 (en) 2002-07-04 2008-07-29 Delphi Technologies, Inc. Fuel injection system
WO2006013151A1 (fr) * 2004-08-03 2006-02-09 Robert Bosch Gmbh Procede et dispositif pour la reduction de pression de rampe dans un systeme d'injection a rampe d'alimentation commune

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