EP1809895B1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
EP1809895B1
EP1809895B1 EP05803292A EP05803292A EP1809895B1 EP 1809895 B1 EP1809895 B1 EP 1809895B1 EP 05803292 A EP05803292 A EP 05803292A EP 05803292 A EP05803292 A EP 05803292A EP 1809895 B1 EP1809895 B1 EP 1809895B1
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
fuel
pressure booster
booster
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
EP05803292A
Other languages
German (de)
English (en)
Other versions
EP1809895A1 (fr
Inventor
Achim Brenk
Hans-Christoph Magel
Volkmar Kern
Goran Kanis
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1809895A1 publication Critical patent/EP1809895A1/fr
Application granted granted Critical
Publication of EP1809895B1 publication Critical patent/EP1809895B1/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
    • 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
    • F02M57/026—Construction details of pressure amplifiers, e.g. fuel passages or check valves arranged in the intensifier piston or head, particular diameter relationships, stop members, arrangement of ports or conduits
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps

Definitions

  • a further preferred embodiment of the fuel injection device is characterized in that the Ausretes Wegstellfeder adopted between an injector housing fixed stop and a collar is clamped, which is formed on the pressure booster piston and limits the pressure booster control chamber.
  • the pressure booster control chamber facing away from the end face of the federal is acted upon by the pressure of the high-pressure fuel source.
  • the fuel injection device serves to introduce fuel into direct-injection diesel engines.
  • the injection of fuel is stroke controlled.
  • This has the advantage that the injection pressure can be adapted to load and speed.
  • a high injection pressure is required.
  • a pressure intensifier integrated in the injector is used to further increase the pressure.
  • a pressure booster control chamber is used to control the pressure booster, which is also referred to as differential space or rear space. The function of the pressure booster will be explained below.
  • the pressure intensifier enables flexible multiple injection. For stable representation of very small injection quantities a needle stroke damper is used, which delays the opening movement of the nozzle needle.
  • a connecting line 88 leads from the pressure booster working chamber 26 to the metering valve device 12, which is designed as a solenoid-operated 3/2-way valve. From the metering valve device 12, a connecting line 90 leads to a (not designated) low-pressure region.
  • a control line 92 which may also be referred to as a first control line 92, leads from the valve device 12 to the pressure amplifier control chamber 23.
  • the pressure booster piston 25 assumes its defined intermediate position 85, which is also referred to as the starting position, because the spring force of the return spring device 70 is greater than the spring force of the booster spring 27.
  • a pressure reduction takes place in the pressure booster working chamber 26 and the pressure booster control chamber 23rd
  • the pressure booster pressure space 22 can not normally relax because all the connection paths to the rail pressure are closed and the pressure booster piston 25 can not make a negative lift in conventional fuel injections.
  • a pressure compensation via the guides on the pressure booster piston 25 and the nozzle needle 10 can only be done very slowly.
  • the pressure booster pressure chamber 22 is relaxed by the pressure booster piston 25 being able to retract further from the intermediate position 85 until it reaches its pressure equalization position 86.
  • the stop ring 81 is pushed upwards, that is, away from the combustion chamber.
  • the pressure intensifier piston returns to its defined intermediate position 85 due to the spring forces of the springs 27 and 70.
  • a substantially circular cylindrical piston portion 110 whose combustion chamber remote end has a collar 112.
  • a stop ring 114 in Appendix, which in turn is supported with its combustion chamber distant end face against a stop 115 of the injector 6.
  • another stop ring 118 At the combustion chamber remote end face of the collar 78 of the pressure booster piston 25 is another stop ring 118, which is supported with its end near the combustion chamber at a further stop 120 of the injector 6.
  • the pressure booster spring 27 is arranged, which in the in FIG. 5 illustrated embodiment also acts as a return spring means 70 at the same time.
  • the pressure booster control chamber 23 which is also referred to as the back space, is separated from the return line 90 by the metering valve 12, which is also referred to as a control valve, and connected to the supply pressure of the high-pressure fuel reservoir 2.
  • the metering valve 12 which is also referred to as a control valve
  • This builds in the pressure booster control chamber 23 and the control line 92 rail pressure.
  • the pressure in the pressure booster pressure chamber 22 and the pressure chamber 15 drops to rail pressure.
  • the nozzle needle 10 closes. In this case, the nozzle needle 10 separates from the damping piston 98 and performs a fast closing movement.
  • the damper piston 98 is then reset by the hydraulic forces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (9)

  1. Dispositif d'injection de carburant dans une chambre de combustion (80) d'un moteur à combustion interne, comprenant un injecteur de carburant (1) qui peut être sollicité par une source de carburant haute pression (2) avec du carburant haute pression, et qui peut être actionné par le biais d'un dispositif de soupape de dosage (12), qui permet de commander la pression dans un espace de commande d'amplificateur de pression (23) de telle sorte que la pression, dans un espace de pression de l'amplificateur de pression (22) limité par un piston d'amplificateur de pression (25) qui peut être rempli de carburant provenant de la source de carburant haute pression (2) par le biais d'un clapet anti-retour (56) et qui est en liaison avec un espace de pression d'organe de soupape d'injection (15), soit augmentée par le piston d'amplificateur de pression (25) de telle sorte qu'un organe de soupape d'injection (10) pour l'injection de carburant s'ouvre, de sorte que du carburant soit injecté hors de l'espace de pression de l'organe de soupape d'injection (15) dans la chambre de combustion (80) du moteur à combustion interne, le piston d'amplificateur de pression (25), dans l'état de repos, adoptant une position de repos (85), caractérisé en ce que le piston d'amplificateur de pression (25) est sollicité par un dispositif de ressort de rappel à déplacement de compensation (27, 70), de telle sorte que lorsqu'une surpression se produit dans l'espace de pression de l'amplificateur de pression (22) sous l'effet d'une réduction rapide de la pression dans l'injecteur (1), le piston d'amplificateur de pression (25) effectue une course négative au-delà de sa position de repos (85) dans une position de compensation de pression (86), et en ce que dans le cas d'une augmentation de la pression de rampe, le piston d'amplificateur de pression (25) revient à l'encontre de la direction du déplacement de compensation de la pression dans sa position de repos (85).
  2. Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que le piston d'amplificateur de pression (25) peut être sollicité par le dispositif de ressort de rappel à déplacement de compensation (27) à la fois dans la direction du déplacement de compensation de la pression et dans la direction opposée.
  3. Dispositif d'injection de carburant selon la revendication 1 ou 2, caractérisé en ce que le dispositif de ressort de rappel à déplacement de compensation (27) est serré entre des bagues de butée (114, 118) qui s'appuient dans des directions opposées contre un boîtier d'injecteur (6).
  4. Dispositif d'injection de carburant selon la revendication 3, caractérisé en ce que l'une des bagues de butée (118) s'applique contre un épaulement (78), qui est réalisé sur le piston d'amplificateur de pression (25) et qui limite l'espace de commande d'amplificateur de pression (23).
  5. Dispositif d'injection de carburant selon la revendication 4, caractérisé en ce que la bague de butée (118) qui s'applique contre l'épaulement (78) peut être déplacée d'avant en arrière entre deux butées (85, 86) qui sont prévues sur le boîtier d'injecteur (6).
  6. Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que le dispositif de ressort de rappel à déplacement de compensation (70) sollicite l'extrémité du piston d'amplificateur de pression (25) opposée à l'espace de pression d'amplificateur de pression (22), et est disposé dans un espace de travail d'amplificateur de pression (26) qui est en liaison avec la source de carburant haute pression (2).
  7. Dispositif d'injection de carburant selon la revendication 1, caractérisé en ce que le dispositif de ressort de rappel à déplacement de compensation (70) est serré entre une butée (71) fixée au boîtier d'injecteur et un épaulement qui est réalisé sur le piston d'amplificateur de pression (25) et qui limite l'espace de commande d'amplificateur de pression (23).
  8. Dispositif d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un conduit de détente de pression (65) part de l'espace de pression d'amplificateur de pression, lequel est en liaison par le biais du dispositif de soupape de dosage (12) avec la source de carburant haute pression (2) et qui, dans l'état de repos du dispositif d'injection de carburant, est fermé par le piston d'amplificateur de pression (25) et n'est libéré que lorsque la pression de la source de carburant haute pression (2) chute.
  9. Dispositif d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de soupape de dosage (12) et/ou l'organe de soupape d'injection (10) et/ou le piston d'amplificateur de pression (25) est/sont intégré(s) dans l'injecteur de carburant (1).
EP05803292A 2004-11-05 2005-10-19 Dispositif d'injection de carburant Not-in-force EP1809895B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004053422A DE102004053422A1 (de) 2004-11-05 2004-11-05 Kraftstoffeinspritzeinrichtung
PCT/EP2005/055350 WO2006048375A1 (fr) 2004-11-05 2005-10-19 Dispositif d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1809895A1 EP1809895A1 (fr) 2007-07-25
EP1809895B1 true EP1809895B1 (fr) 2011-10-12

Family

ID=35561598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05803292A Not-in-force EP1809895B1 (fr) 2004-11-05 2005-10-19 Dispositif d'injection de carburant

Country Status (6)

Country Link
US (1) US7926736B2 (fr)
EP (1) EP1809895B1 (fr)
JP (1) JP2008519202A (fr)
AT (1) ATE528500T1 (fr)
DE (1) DE102004053422A1 (fr)
WO (1) WO2006048375A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI124350B (en) * 2012-03-09 2014-07-15 Wärtsilä Finland Oy Hydraulic actuator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10112154A1 (de) * 2001-03-14 2002-09-26 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
US6631853B2 (en) * 2001-04-09 2003-10-14 Siemens Diesel Systems Technologies, Llc Oil activated fuel injector control valve
DE10247903A1 (de) * 2002-10-14 2004-04-22 Robert Bosch Gmbh Druckverstärkte Kraftstoffeinspritzeinrichtung mit innenliegender Steuerleitung
DE10249840A1 (de) * 2002-10-25 2004-05-13 Robert Bosch Gmbh Kraftstoff-Einspritzeinrichtung für Brennkraftmaschine
DE102004010760A1 (de) * 2004-03-05 2005-09-22 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen mit Nadelhubdämpfung

Also Published As

Publication number Publication date
US7926736B2 (en) 2011-04-19
JP2008519202A (ja) 2008-06-05
DE102004053422A1 (de) 2006-05-11
WO2006048375A1 (fr) 2006-05-11
EP1809895A1 (fr) 2007-07-25
ATE528500T1 (de) 2011-10-15
US20080121735A1 (en) 2008-05-29

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