WO2006053810A1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
WO2006053810A1
WO2006053810A1 PCT/EP2005/055397 EP2005055397W WO2006053810A1 WO 2006053810 A1 WO2006053810 A1 WO 2006053810A1 EP 2005055397 W EP2005055397 W EP 2005055397W WO 2006053810 A1 WO2006053810 A1 WO 2006053810A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
pressure side
control
control chamber
chamber
Prior art date
Application number
PCT/EP2005/055397
Other languages
German (de)
English (en)
Inventor
Friedrich Boecking
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 WO2006053810A1 publication Critical patent/WO2006053810A1/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
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way 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
    • 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

Definitions

  • the invention is based on a fuel injection device according to the preamble of claim 1.
  • the valve needle of a fuel injection valve is opened or closed depending on the pressure prevailing in a control chamber fuel pressure.
  • the permanently connected to the high pressure side control chamber can be connected by means of a drain throttle and a not-described 2/2-way control valve to the low pressure side and thereby relieved of pressure.
  • the drain throttle adversely limits the opening speed of the valve needle in the first opening phase.
  • the fuel injection device with the characterizing features of claim 1 has the advantage that the valve needle is opened extremely quickly in the first opening phase. As soon as the connection of the control chamber to the low pressure side is opened during the transition from one to the other end position of the valve member, the control pressure is abruptly reduced via the flow channel provided parallel to the outlet throttle until the drainage channel is closed and only the outlet throttle acts. Since the control pressure is lowered very quickly via the drainage channel, the valve needle also opens very quickly. With the transition to the single-acting outlet throttle, the fast opening of the valve needle is slowed down.
  • the single FIGURE shows a sectional view through the fuel injection device according to the invention.
  • the fuel injection device (fuel injection valve) 1 shown in the figure is commonly used in an engine having a plurality of cylinders, and each of these cylinders is associated with such a fuel injection device (injector).
  • the fuel injection device 1 comprises, in a manner known per se, an injection nozzle projecting into a cylinder combustion chamber of the internal combustion engine and an injection opening of the injection nozzle depending on the pressure in a control chamber 2 opening and closing valve needle (nozzle needle) 3, which is indicated here only to a small extent on.
  • the control chamber 2 is permanently connected to a high-pressure inlet line (high-pressure side) 5 via an inlet throttle 4.
  • a control valve 6 is provided in the form of a double-seat valve, which opens or blocks the connection of the control chamber 2 with a low-pressure drain line (low-pressure side) 7.
  • the high-pressure feed line 5 may be connected to a high-pressure accumulator (common rail), not shown, and the low-pressure drain line 7 with leak oil.
  • valve member 8 of the control valve 6 is axially adjustable in a valve chamber 9 between two coaxial annular valve seats 10, 11 by means of a piezoelectric actuator 12, for example, and has two oppositely directed sealing surfaces 13, 14 which cooperate with the two valve seats 10, 11.
  • the lower in the figure valve seat 10 is between the valve chamber 9 and one of the Control chamber 2 outgoing flow channel 15 and the upper valve seat 11 between the valve chamber 9 and low-pressure drain line 7 is provided.
  • the valve chamber 9 is permanently connected to the control chamber 2 via an outlet throttle 16, which has a higher throttle resistance than the outlet channel 15.
  • valve opening of the upper valve seat 11 is closed by the upper sealing surface 14 of the valve member 8 and the valve opening of the lower valve seat 10 is opened, so that the connection of the control chamber 2 is closed to the low-pressure drain line 7.
  • the pressure prevailing in the control chamber 2 high pressure acts on a force acting in the closing direction of the nozzle needle 3 control surface 17 of the nozzle needle 3, so that the nozzle needle 3 and the fuel injection valve are closed.
  • valve member 8 is displaceable by means of the actuator 12 against the force of a closing spring 18 in a lower Ventilend ein in which the valve member 8 closes with its lower sealing surface 13, the valve opening of the lower valve seat 10.
  • the valve member 8 is located between the two valve seats 10, 11, so that the valve openings of the two valve seats 10, 11 are open and the control chamber 2 via the outlet channel 15 and the outlet throttle 16 with
  • Low-pressure drain line 7 is connected.
  • the pressure prevailing in the control chamber 2 pressure is abruptly lowered, and the nozzle needle 3 and the fuel injection valve opens.
  • the valve chamber 9 mainly via the flow channel 15, which thus determines the opening speed of the nozzle needle 3. Since the pressure on the drain channel 15 is lowered very quickly, the nozzle needle 3 opens very quickly.

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) conçu pour des moteurs à combustion interne, comprenant : une chambre de commande (2) qui est raccordée à un côté haute pression (5), et qui est reliée à une soupape de commande (6) raccordée à un côté basse pression (7), par l'intermédiaire d'un étranglement d'évacuation (16), et ; une aiguille de soupape (3) qui peut être déplacée axialement, et qui peut être actionnée par l'intermédiaire d'une surface de commande (17) se trouvant dans la chambre de commande (2) et agissant dans la direction de fermeture, pour fermer et ouvrir des ouvertures d'injection. Cette invention est caractérisée en ce que la soupape de commande (6) comprend un obturateur (8) qui peut être déplacé entre deux positions extrêmes. Dans une première position extrême, cet obturateur bloque la liaison entre la chambre de commande (2) et le côté basse pression (7), et dans l'autre position extrême, ledit obturateur relie la chambre de commande (2) avec le côté basse pression (7) par l'intermédiaire de l'étranglement d'évacuation (16). Entre les deux positions extrêmes de l'obturateur (8), la chambre de commande (2) est reliée au côté basse pression (7) par l'intermédiaire de l'étranglement d'évacuation (16) et également par l'intermédiaire d'un canal d'évacuation (15) qui est parallèle à l'étranglement d'évacuation (16), et qui présente une résistance inférieure à celle de l'étranglement d'évacuation (16).
PCT/EP2005/055397 2004-11-17 2005-10-20 Dispositif d'injection de carburant WO2006053810A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410055263 DE102004055263A1 (de) 2004-11-17 2004-11-17 Kraftstoffeinspritzvorrichtung
DE102004055263.0 2004-11-17

Publications (1)

Publication Number Publication Date
WO2006053810A1 true WO2006053810A1 (fr) 2006-05-26

Family

ID=35462277

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/055397 WO2006053810A1 (fr) 2004-11-17 2005-10-20 Dispositif d'injection de carburant

Country Status (2)

Country Link
DE (1) DE102004055263A1 (fr)
WO (1) WO2006053810A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007110256A1 (fr) * 2006-03-24 2007-10-04 Robert Bosch Gmbh Injecteur de carburant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10131640A1 (de) * 2001-06-29 2003-01-16 Bosch Gmbh Robert Kraftstoffinjektor mit Einspritzverlaufsformung durch schaltbare Drosselelemente
WO2003004858A1 (fr) * 2001-06-29 2003-01-16 Robert Bosch Gmbh Injecteur de carburant a sollicitation en pression variable de la chambre de commande
DE10254749A1 (de) * 2002-11-23 2004-06-17 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung mit einem 3/3-Wege-Steuerventil zur Einspritzverlaufsformung
DE10304605A1 (de) * 2003-02-05 2004-08-19 Robert Bosch Gmbh Kraftstoffeinspritzventil mit zwei koaxialen Ventilnadeln
WO2005015003A1 (fr) * 2003-08-01 2005-02-17 Robert Bosch Gmbh Dispositif d'injection de carburant pour moteur a combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10131640A1 (de) * 2001-06-29 2003-01-16 Bosch Gmbh Robert Kraftstoffinjektor mit Einspritzverlaufsformung durch schaltbare Drosselelemente
WO2003004858A1 (fr) * 2001-06-29 2003-01-16 Robert Bosch Gmbh Injecteur de carburant a sollicitation en pression variable de la chambre de commande
DE10254749A1 (de) * 2002-11-23 2004-06-17 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung mit einem 3/3-Wege-Steuerventil zur Einspritzverlaufsformung
DE10304605A1 (de) * 2003-02-05 2004-08-19 Robert Bosch Gmbh Kraftstoffeinspritzventil mit zwei koaxialen Ventilnadeln
WO2005015003A1 (fr) * 2003-08-01 2005-02-17 Robert Bosch Gmbh Dispositif d'injection de carburant pour moteur a combustion interne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007110256A1 (fr) * 2006-03-24 2007-10-04 Robert Bosch Gmbh Injecteur de carburant

Also Published As

Publication number Publication date
DE102004055263A1 (de) 2006-05-18

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