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EP1029173B1 - Unite de commande pour soupape d'injection de carburant - Google Patents

Unite de commande pour soupape d'injection de carburant Download PDF

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Publication number
EP1029173B1
EP1029173B1 EP99936421A EP99936421A EP1029173B1 EP 1029173 B1 EP1029173 B1 EP 1029173B1 EP 99936421 A EP99936421 A EP 99936421A EP 99936421 A EP99936421 A EP 99936421A EP 1029173 B1 EP1029173 B1 EP 1029173B1
Authority
EP
European Patent Office
Prior art keywords
valve control
control piston
end member
valve
control unit
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.)
Expired - Lifetime
Application number
EP99936421A
Other languages
German (de)
English (en)
Other versions
EP1029173A1 (fr
Inventor
Dieter Kienzler
Friedrich Boecking
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 EP1029173A1 publication Critical patent/EP1029173A1/fr
Application granted granted Critical
Publication of EP1029173B1 publication Critical patent/EP1029173B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/008—Means for influencing the flow rate out of or into a control chamber, e.g. depending on the position of the needle

Definitions

  • the invention relates to a valve control unit for Fuel injection valve, in particular for a common rail injector, according to the preamble of claim 1.
  • Such a valve control unit is, for example, by EP_0_661_442_A1 or EP-A-0 753 659 have become known.
  • Valve control units are provided for Pressurization of one end of a slidable to influence the stored valve control piston.
  • the other The end of the valve spool can be placed on a nozzle needle act so that the nozzle needle either the Injection opening seals or the exit of Allows fuel from the injection port.
  • valve control unit Pressurizing an end member of the valve spool by changing the pressure conditions within a first Valve control room carried out via an inlet channel is connected to a high-pressure accumulator (common rail).
  • a drain channel to a second with the first valve control room consistently connected valve control room is connected, open. Therefore, the pressure in the first valve control room drops and thus the hydraulic force on the valve control piston.
  • the first valve control chamber disadvantageously only has one small volume so that an opening of the drain channel a quick pressure drop within the first Valve control room results.
  • valve control unit therefore only has one small volume of the first valve control space because of the Valve control piston in the area of the passage from the first to the second valve control room at a hydraulic stop (Fuel cushion) is present in this Passage area trained.
  • a volume increase would with a hydraulic stop to a disadvantage Vibration behavior of the abutting one Guide the valve control piston.
  • the exit of fuel in the second valve control room corresponds to the pressure loss within the Valve control room and only turns after a certain Time to a constant value.
  • Valve control piston moves in the direction of the injection opening so that it is closed again. Because of the (with the drain channel open) considerable pressure loss within the first and second valve control spaces Movement of the valve control piston in the direction Injection opening (nozzle needle) only after a certain time reached when there is sufficient pressure within the first valve control room is rebuilt. at The termination of the injection process can therefore Injection opening with the nozzle needle is not high Speed to be closed because of such Movement of the valve control piston is not possible.
  • valve control unit for a Fuel injection valve, in particular for a common rail injector, points for a faster closing process the nozzle needle to end the injection process characterizing features of claim 1.
  • the fluidic connection between the first and second valve control chamber is through a throttle channel manufactured within the end member of the Valve control piston is formed.
  • a throttle channel manufactured within the end member of the Valve control piston is formed.
  • Flow guidance of the fuel from a high pressure accumulator (common rail) through the first valve control space in the outlet channel are the inlet channel and the throttle channel in Series connected in series.
  • the Forming the throttle channel enables a mechanical Stop of the end member of the valve control piston Edge areas of the passage between the first and second Valve control chamber.
  • the end member of the valve control piston can stop there and seal the drain opening so that Fuel only through the throttle channel in the second Valve control room and thus can get into the drain channel.
  • the first Valve control room Due to the mechanical stop, the first Valve control room have a large volume without a Vibration behavior of the valve control piston can occur. This trained in comparison to the prior art Volume increase leads to this within the first Valve control room a slow pressure drop takes place. After closing the drain channel, only the pressure has to be increased within the smaller second valve control room the pressurization of the valve spool perform. The valve control piston can move the React the nozzle needle faster.
  • valve control unit 1 is in an idle state in which the injection opening is closed, which is not shown in FIG. 1 .
  • the valve control unit 1 has a housing body 2, in which a valve control piston 3 is slidably mounted. Above a pressurizable piston surface 4 is a first valve control chamber 5 is formed. About one Inlet channel in the form of an inlet throttle 6 is the first Valve control room 5 with a high pressure accumulator (common rail) connected. With the help of a passage 7 can fuel in reach a second valve control room 8.
  • the second Valve control chamber 8 has passage 7 on one opposite end link connects to a Drain channel in the form of a drain throttle 9.
  • the Flow restrictor 9 is in the state shown in FIG. 1 closed by a valve ball 10 of a solenoid valve, that is not shown in Figure 1.
  • a drain opening 11 releases, fuel can escape in the direction of arrow 12 and fed into a storage container.
  • the pressure within the second valve control chamber 8 decreases.
  • the Pre-injection can be carried out by means of the valve control unit 1 perform in a known manner.
  • the pressure within the first valve control space changes so that a End member of the valve control piston 3 moves such that an end face 14 of the end member 13 on stop faces 15 come from edge areas 16 of the passage 7 to the plant.
  • Fuel can flow through a throttle channel in the form of a pass through further inlet throttle 17.
  • the inlet throttle 17 extends from an outer peripheral surface 18 of the End member 13 to its end face 14.
  • the end member 13 can stop against the edge regions 16 Fuel exchange between the first valve control chamber 5 and the second valve control chamber 8 occur.
  • the Inlet throttle 6 and the other inlet throttle 17 are included connected in series.
  • the flow inside the inlet throttle 17 is smaller than within the Inlet throttle 6.
  • the first valve control chamber 5 is in Connection with the high pressure accumulator and owns inside its volume a pressure that the high pressure accumulator is comparable because a pressure equalization between the Valve control rooms 5 and 8 due to the volume ratio and the flow cross sections of the inlet throttles 6 and 17 can only be done slowly.
  • valve control piston 3 Due to the design of the valve control piston 3 in terms of its end member 13 that to the Valve control piston 3 coaxial with reduced Outside diameter is formed, the free volume of the first valve control chamber 5 further enlarge.
  • the Volume increase of the valve control room 5 supports in Connection with the mechanical stop the occurrence of a only slow pressure loss within the first Valve control room 5 when opening the drain opening 11. This has a positive effect on the high closing speed of the Valve control piston 3 or a nozzle needle, not shown out.
  • FIG. 1 Another embodiment of an end member 20 of the valve control piston 3 is shown in FIG .
  • the end member 20 has an inlet throttle 21 which runs transversely to the longitudinal axis of the valve control piston 3 and is connected in a T-shape to a further inlet throttle 22. Due to the entry of fuel into the inlet throttles 21 and 22, fuel can pass from the first valve control chamber 5 into the second valve control chamber 8.

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

Abstract

L'invention concerne une unité de commande (1) pour soupape d'injection de carburant, qui comporte deux chambres de commande de soupape (5, 8) communicantes. A l'intérieur de la première chambre de commande de soupape (5), qui est reliée à un canal d'arrivée (6), peut se déplacer un élément d'extrémité (13) d'un piston de commande de soupape (3) pouvant être soumis à l'action de la pression, cela de telle sorte que la section d'écoulement peut être modifiée pour un échange de carburant, celui-ci partant de la première chambre de commande de soupape (5) pour aller dans la seconde chambre de commande de soupape (8), laquelle communique avec un canal de sortie (9). Dans l'élément d'extrémité (13) du piston de commande de soupape (3) se trouve un canal d'étranglement (17) permettant l'échange de carburant entre les chambres de commande de soupape (5, 8). Grâce à la configuration du canal d'étranglement (17), une butée mécanique de l'élément d'extrémité (13) du piston de commande de soupape (3) contre les zones marginales du passage entre les chambres de commande de soupape (5, 8) est possible. Cette butée permet une augmentation du volume de la première chambre de commande de soupape (5), cela sans que cette augmentation de volume puisse avoir un effet négatif sur le comportement de butée de l'élément d'extrémité (13). La finalité d'un tel agencement est que l'on peut obtenir une vitesse de réaction élevée du piston de commande de soupape (3) une fois le processus d'injection terminé.

Claims (6)

  1. Unité de commande de soupape pour un injecteur de carburant comportant deux chambres de commande d'injecteur (5, 8) reliée l'une à l'autre, la première ayant une chambre de commande d'injecteur (5) reliée à un canal d'alimentation (6) en carburant avec un organe d'extrémité (13, 20) d'un piston de commande d'injecteur (3) sollicité en pression, mobile de façon à modifier la section d'écoulement pour un échange de carburant de la première chambre de commande d'injecteur (5) dans la seconde chambre de commande d'injecteur (8) reliée à un canal de sortie (9) qui peut être fermé,
    caractérisée en ce que
    l'élément d'extrémité (13, 20) du piston de commande d'injecteur (3) comporte un canal d'étranglement (17, 21, 22) pour l'échange de carburant entre les chambres de commande d'injecteurs (5, 8),
    le canal d'étranglement (17, 21, 22) ayant une section d'écoulement réduite par rapport à celle du canal d'alimentation (6).
  2. Unité de commande de soupape selon la revendication 1,
    caractérisée en ce que
    le canal d'étranglement (17, 21, 22) s'étend transversalement à l'axe longitudinal du piston de commande d'injecteur (3) et à partir de la surface périphérique extérieure (18) de l'organe d'extrémité (13) du piston de commande d'injecteur (3) jusqu'à la face frontale (14) de l'élément d'extrémité (13) du piston de commande d'injecteur (3).
  3. Unité de commande de soupape selon la revendication 1,
    caractérisée en ce que
    le canal d'étranglement traverse un premier segment de canal (21) à l'intérieur de l'élément d'extrémité (20) du piston de commande d'injecteur (3), transversalement à l'axe longitudinal du piston de commande d'injecteur (3) et un second segment de canal (22) relié en continu avec le premier segment de canal (21) et qui s'étend dans la direction de l'axe longitudinal du piston de commande d'injecteur (3) jusqu'à la face frontale (23) de l'élément d'extrémité (20) du piston de commande d'injecteur (3)
  4. Unité de commande de soupape selon l'une des revendications précédentes,
    caractérisée en ce que
    des zones de bord (16) qui limitent le passage (7) dirigé vers la chambre de commande de soupape (5) forment des surfaces de butée (15) pour des surfaces antagonistes de l'élément d'extrémité (13, 20) du piston de commande d'injecteur (3).
  5. Unité de commande de soupape selon l'une des revendications précédentes.
    caractérisée en ce que
    le piston de commande d'injecteur (3) va en diminuant vers son élément d'extrémité (13, 20).
  6. Unité de commande de soupape selon la revendication 5,
    caractérisée en ce que
    le rétrécissement est réalisé au niveau de son passage étagé du piston de commande d'injecteur (3) par un segment d'extrémité coaxial, cylindrique au piston de commande d'injecteur (3) et ayant un diamètre extérieur diminué par rapport à celui du piston de commande d'injecteur (3).
EP99936421A 1998-06-16 1999-06-08 Unite de commande pour soupape d'injection de carburant Expired - Lifetime EP1029173B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19826719A DE19826719A1 (de) 1998-06-16 1998-06-16 Ventilsteuereinheit für ein Kraftstoffeinspritzventil
DE19826719 1998-06-16
PCT/DE1999/001661 WO1999066192A1 (fr) 1998-06-16 1999-06-08 Unite de commande pour soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1029173A1 EP1029173A1 (fr) 2000-08-23
EP1029173B1 true EP1029173B1 (fr) 2003-10-08

Family

ID=7871001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99936421A Expired - Lifetime EP1029173B1 (fr) 1998-06-16 1999-06-08 Unite de commande pour soupape d'injection de carburant

Country Status (5)

Country Link
EP (1) EP1029173B1 (fr)
JP (1) JP2002518629A (fr)
KR (1) KR20010022916A (fr)
DE (2) DE19826719A1 (fr)
WO (1) WO1999066192A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19963920B4 (de) * 1999-12-31 2005-01-13 Robert Bosch Gmbh Injektor für ein Common-Rail-Kraftstoffeinspritzsystem mit schiebergesteuertem Zulaufkanal und direkter Kopplung von Steuerkolben und Düsenkanal
DE10033426B4 (de) * 2000-07-10 2004-10-14 Robert Bosch Gmbh Injektor/Düsennadel-Kombination mit steuerraumseitiger Kopplung
WO2002044546A1 (fr) * 2000-11-28 2002-06-06 Siemens Aktiengesellschaft Chambre de commande et piston pilote destines a une soupape d'injection d'un moteur a combustion interne
DE10152230A1 (de) * 2001-10-20 2003-04-30 Bosch Gmbh Robert Hochdruckfester Injektorkörper
DE10155406A1 (de) * 2001-11-10 2003-05-22 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10163693A1 (de) * 2001-12-21 2003-07-10 Orange Gmbh Einspritzinjektor für Brennkraftmaschinen
US20060196974A1 (en) * 2005-03-01 2006-09-07 Caterpillar Inc. Fuel injector having a gradually restricted drain passageway
US7506825B2 (en) 2006-05-31 2009-03-24 Caterpillar Inc. Fuel injector control system
EP2085604A1 (fr) 2008-02-04 2009-08-05 Robert Bosch GmbH Injecteur de carburant
DE102009000283A1 (de) 2008-02-04 2009-08-06 Robert Bosch Gmbh Injektor zum Einspritzen von Kraftstoff
DE102012221470A1 (de) * 2012-11-23 2014-05-28 Robert Bosch Gmbh Brennstoffeinspritzventil
EP2808532B1 (fr) * 2013-05-30 2017-08-16 Delphi International Operations Luxembourg S.à r.l. Injecteur de carburant
GB201402921D0 (en) * 2014-02-19 2014-04-02 Delphi Int Operations Luxembourg Sarl Fuel injector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1232027B (it) * 1989-03-03 1992-01-23 Weber Srl Perfezionamento ai dispositivi di iniezione del combustibile ad azio namento elettromagnetico per motori a ciclo diesel
IT1250900B (it) * 1991-12-24 1995-04-21 Elasis Sistema Ricerca Fiat Valvola di iniezione del combustibile a comando elettromagnetico.
IT1261149B (it) * 1993-12-30 1996-05-09 Elasis Sistema Ricerca Fiat Valvola di dosaggio per il comando dell'otturatore di un iniettore di combustibile
GB9508623D0 (en) * 1995-04-28 1995-06-14 Lucas Ind Plc "Fuel injection nozzle"
JPH0932683A (ja) * 1995-07-14 1997-02-04 Isuzu Motors Ltd 内燃機関の燃料噴射装置

Also Published As

Publication number Publication date
EP1029173A1 (fr) 2000-08-23
DE19826719A1 (de) 1999-12-23
DE59907284D1 (de) 2003-11-13
JP2002518629A (ja) 2002-06-25
WO1999066192A1 (fr) 1999-12-23
KR20010022916A (ko) 2001-03-26

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