EP1541859B1 - Injecteur - Google Patents

Injecteur Download PDF

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Publication number
EP1541859B1
EP1541859B1 EP20040024922 EP04024922A EP1541859B1 EP 1541859 B1 EP1541859 B1 EP 1541859B1 EP 20040024922 EP20040024922 EP 20040024922 EP 04024922 A EP04024922 A EP 04024922A EP 1541859 B1 EP1541859 B1 EP 1541859B1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
valve
injection valve
injection
pressure
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 - Fee Related
Application number
EP20040024922
Other languages
German (de)
English (en)
Other versions
EP1541859A1 (fr
Inventor
Michael Kurz
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 EP1541859A1 publication Critical patent/EP1541859A1/fr
Application granted granted Critical
Publication of EP1541859B1 publication Critical patent/EP1541859B1/fr
Expired - Fee Related 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention is based on an injection valve according to the closer defined in the preamble of claim 1. Art.
  • Such injection valve is from the DE 102 05 970 A1 known and used in particular for injecting diesel fuel into a combustion chamber of a diesel internal combustion engine of a motor vehicle.
  • A1 known injection valve comprises a valve housing in which a nozzle module and a valve control module are arranged.
  • the nozzle module comprises a first, outer nozzle needle, which cooperates with a first row of holes, and a second, inner nozzle needle, which cooperates with a second row of holes.
  • the second nozzle needle is arranged coaxially with the first nozzle needle and guided in a channel axially extending through the first nozzle needle.
  • valve control module The control of the nozzle needle by means of the valve control module, in such a way that a prevailing in a valve control chamber fluid pressure is changed such that the two nozzle needles an axial position change experienced and released in accordance with the set in the valve control chamber pressure cooperating with the first nozzle needle row of holes and possibly cooperating with the second nozzle needle row of holes.
  • the valve control chamber is connected on the one hand via a so-called inlet throttle with a fuel supply line and on the other hand via a so-called outlet throttle with a valve chamber of the valve control module.
  • a cooperating with at least one valve seat valve closure member is arranged in the valve chamber.
  • the nozzle module which is a so-called coaxial vario nozzle and thus serves to control two injection or injection nozzle circuits, can be designed so that the inner nozzle needle opens only when the outer nozzle needle abuts its upper stroke stop.
  • a so-called boat-shaped injection of fuel into the combustion chamber of the internal combustion engine can be achieved.
  • the nozzle needles close when the flow restrictor branching off from the control chamber is blocked and filling of the valve control chamber takes place via the inlet throttle. This results in a pressure surplus in the valve control chamber, so that the nozzle needles are pressed back to their respective needle seat.
  • the injection valve according to the invention with the features according to the preamble of claim 1, wherein the first nozzle needle is assigned at least one driver, which causes an opening and closing of the second nozzle needle, has the advantage that by the thus taking place mechanical Actuation of the second nozzle needle, the fluid pressure in the valve control chamber when driving the first nozzle needle and when driving the first and the second nozzle needle remains substantially at the same level. For these reasons, the prevailing balance of power when opening the second nozzle needle, ie the inner nozzle needle, balanced than in a hydraulic control of the inner nozzle needle. Also opens the inner nozzle needle compared to a hydraulic control slower.
  • the slower opening of the inner nozzle needle in turn leads in the map of the injector to a lower pitch in the range associated with the opening of the inner nozzle needle jump quantity at the opening time of the inner nozzle needle.
  • the upper stroke stop of the outer nozzle needle can be designed arbitrarily and in particular be provided with a damping.
  • the inner nozzle needle may be provided on its side facing the valve control chamber with an enlarged compared to the prior art attack surface, which in turn causes a good damping of the inner nozzle needle.
  • the injection valve according to the invention may in particular be part of a common-rail injection system and serve for fuel injection into a combustion chamber of a diesel internal combustion engine of a motor vehicle.
  • the driver which causes opening and closing of the second nozzle needle, formed by a control piston of the first nozzle needle.
  • This spool With its front side facing away from the injection openings, it adjoins the valve control chamber and transmits the forces exerted on it to the first nozzle needle. From a certain, preset stroke of the control piston acts when opening the first nozzle needle on the second nozzle needle.
  • the control piston preferably acts from the beginning on both nozzle needles. This ruled out that the first nozzle needle reaches its closed position before the second nozzle needle.
  • the second nozzle needle, d. H. the inner nozzle needle can be made both one-piece and multi-part.
  • the inner nozzle needle preferably has a region of reduced diameter, via which the inner nozzle needle is guided in the control piston of the outer nozzle needle.
  • the region of reduced diameter may be assigned to a pressure pin, which is in particular of mushroom-shaped design and engages via a loose connection to a closing member of the inner nozzle needle which controls the associated injection openings. If the pressure pin and the closing member are made in one piece or firmly connected to each other, can be dispensed with the formation of a pressure assisting the opening opening on the inner nozzle needle.
  • the pressure pin of the inner nozzle needle can cooperate with a stroke stop, which is formed by a valve plate, in which an inlet throttle and an outlet throttle for controlling the pressure in the valve control chamber are arranged.
  • a stroke stop which is formed by a valve plate, in which an inlet throttle and an outlet throttle for controlling the pressure in the valve control chamber are arranged.
  • the outlet throttle is not covered by the pressure pin when the inner nozzle needle is open. Rather, the pressure pin or the inner nozzle needle should "float" in the open state on the outlet throttle, so that always a continuous flow through the outlet throttle can be done.
  • the outlet throttle and the inlet throttle can also open into the valve control chamber outside the stroke stop region of the inner nozzle needle.
  • the valve control module of the injection valve according to the invention is generally formed valve-like and controlled either by means of an electromagnetically operating actuator or by means of a piezoelectric actuator.
  • an injection valve 1 is shown, which is part of a so-called common-rail injection system and for injecting fuel into a combustion chamber of a diesel internal combustion engine of a motor vehicle.
  • the injection valve 1 comprises, as essential structural units, a valve control module 2, which is illustrated here only in principle, and has a valve-like design, and a nozzle module 3.
  • the nozzle module 3 is designed as a coaxial Vario nozzle and has for this purpose a needle unit, which is formed from an outer nozzle needle 4 and an inner, the outer nozzle needle 4 by cross-nozzle needle 5.
  • valve control chamber 9 For controlling a valve control chamber 9 is formed on the side facing away from the injection nozzles 7 and 8 side of the nozzle module 3, on the one hand via a feed channel 11 formed with an inlet throttle 11 with a fuel supply line 12 and on the other hand via a provided with an outlet throttle 13 drain passage 14 with the valve-like design Valve control module 2 is connected.
  • the inlet throttle 10 and the outlet throttle 13 are formed in a valve plate 15, which limits the valve control chamber 9 end face.
  • the outer nozzle needle 4 is surrounded radially by a ring-shaped high pressure chamber 16, in which a fuel supply channel 17 opens, which is connected via the fuel supply line 12 with a so-called common rail of the injection system, are supplied by a plurality of injectors of the type shown.
  • the pressure chamber 16 may be under a usual in common rail systems high pressure, for example, up to 1.6 kbar.
  • the outer nozzle needle 4 has a pressure shoulder 17 onto which a fluid pressure assisting opening of the outer nozzle needle 4 acts.
  • the outer nozzle needle 4 is further associated with a control piston which is adjacent to the injection nozzles 8 facing away from the end face of the valve control chamber 9 and the by means of a coil spring 19 which is supported on the one hand on the housing 6 and on the other hand acts on a collar 20 of the control piston, biased in the closing direction of the outer nozzle needle 4.
  • the inner nozzle needle 5 is guided in a channel 21 which passes axially through the outer nozzle needle 4 and comprises a pressure pin 22, which passes axially through the control piston and is guided therein.
  • the pressure pin 22 has a smaller diameter than the region of the inner nozzle needle 5, which is guided in the outer nozzle needle 4, and has a mushroom-shaped end portion 23 which projects into the control chamber 9.
  • the pressure pin 22 is located in the in FIG. 1 shown position loosely on the guided in the outer nozzle needle 4 region of the inner nozzle needle 5 at.
  • control piston To discharge a leak, the control piston further comprises a transverse bore 24, which connects a leakage gap surrounding the pressure pin 22 with a spring chamber 25 for the coil spring 19, from which a return line 26 branches off.
  • the inner nozzle needle 5 further has, downstream of the injection nozzles 8 associated therewith, a pressure stage 27 on which, when the nozzle needle 4 is open, a fluid pressure assisting in opening the inner nozzle needle 5 acts.
  • the valve control module 2 is designed like a valve and has two switching positions. In one in the FIGS. 1 and 4 shown switching position, the outlet throttle 13 is locked and in the other switching position in the Figures 2 and 3 is shown, the outlet throttle 13 is released, so that fuel can flow out of the valve control chamber 9, which leads to a pressure relief of the same.
  • the valve control module 2 in the present case has a piezoelectric actuator, which is not shown, which acts on a valve closing member which releases or blocks a fluid flow between the control chamber 9 of the nozzle module 3 and a return line of the valve control module 2.
  • FIGS. 1 to 4 illustrated injection valve 1 operates in the manner described below.
  • FIG. 1 the closed position of the two nozzle needles 4 and 5 is shown, in which via the injection nozzles 7 and 8 no fuel enters the combustion chamber of the internal combustion engine.
  • the valve control module 2 is in its blocking position, so that no fuel can flow out of the control chamber 9 via the outlet throttle 13.
  • the so-called rail pressure is provided which holds the outer nozzle needle 4 and the inner nozzle needle 5 via the valve spool in the closed position, the engages in the closed position on the two nozzle needles 4 and 5 on each of the injection nozzles 7 and 8 facing away from the end face.
  • the pressure pin 22 is pressed by the prevailing in the control chamber fluid pressure against the guided in the outer nozzle needle portion of the inner nozzle needle 5.
  • valve-like design valve control module 2 is actuated, there is a pressure relief of the control chamber 9, whereby the valve control piston 18 experiences an axial offset in the injection nozzles 7 and 8 opposite direction.
  • the outer nozzle needle 4 follows the valve control piston, so that the outer nozzle needle 4 associated injectors 7 are released and fuel is injected into the combustion chamber of the internal combustion engine.
  • the valve control piston is used when opening via a driver edge 181 as a driver (18) for the pressure pin 22 of the inner nozzle needle 5, so that control room side no longer acts on the inner nozzle needle 5 and the latter opens by acting on the front side pressure stage 27 fluid pressure.
  • the valve control piston is further moved to an upper stop 28, and the pressure pin 22 is, if the control of the valve control module is not previously terminated by means of acting on the inner nozzle needle 5 via the pressure stage 27 fluid pressure to proceed until the front end portion 23 at the valve plate 15 abuts.
  • the pressure pin 22 or its end region 23 lies against the valve plate 15 in such a way that fuel can flow through the outlet throttle 13. This valve position is FIG. 3 refer to.
  • valve control module 2 when the valve control module 2 is brought into the closed position, the control pressure increases in the control chamber 9, so that on the end face of the control piston, a fluid pressure acts, which leads to a closing of the outer nozzle needle 4.
  • the control piston engages in its function as a driver via a driver edge 182 also at the end facing away from the injectors 8 end of guided in the outer nozzle needle 4 area of the inner nozzle needle 5, so that the inner nozzle needle 5 is brought into the locked position and assigned to this Injectors 8 closes.
  • the inner nozzle needle 5 and the outer nozzle needle 4 are thus brought into the closed position substantially at the same time as FIG. 4 can be seen.
  • the pressure pin 22 lifts when closing the nozzle needles 4 and 5 from the guided in the outer nozzle needle 4 region of the inner nozzle needle 5 from. He learns only after closing the injectors 7 and 8 an offset in his in FIG. 1 illustrated starting position, which may be provided for any pressure reduction in the space between the pressure pin 22 and guided by the guided in the outer nozzle needle portion of the inner nozzle needle 5, not shown here discharge channel.

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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)

Claims (7)

  1. Soupape d'injection comprenant un module de buse (3) dans lequel sont guidées, de manière déplaçable axialement, une première aiguille de buse (4) coopérant avec au moins une première ouverture d'injection (7) et une deuxième aiguille de buse (5) coopérant avec au moins une deuxième ouverture d'injection (8) et guidée dans un canal (21) venant en prise axialement à travers la première aiguille de buse (4), et comprenant un module de commande de soupape (2) qui commande une pression de fluide qui règne dans un espace de commande de soupape (9) et dont le niveau établit la position de la première aiguille de buse (4) et de la deuxième aiguille de buse (5), caractérisée en ce que la première aiguille de buse (4) est associée à au moins un dispositif d'entraînement (18) qui provoque une ouverture et une fermeture de la deuxième aiguille de buse (5).
  2. Soupape d'injection selon la revendication 1, caractérisée en ce que le dispositif d'entraînement (18) est formé par un piston de commande de la première aiguille de buse (4), qui entoure de préférence une région de diamètre réduit de la deuxième aiguille de buse (5).
  3. Soupape d'injection selon la revendication 2, caractérisée en ce qu'une goupille de pression (22) de la deuxième aiguille de buse (5) est guidée dans le piston de commande.
  4. Soupape d'injection selon la revendication 3, caractérisée en ce que la goupille de pression (22) est un composant d'une seule pièce de la deuxième aiguille de buse.
  5. Soupape d'injection selon la revendication 3 ou 4, caractérisée en ce que la goupille de pression (22) présente une région d'extrémité en forme de champignon (23), sur laquelle vient en prise le dispositif d'entraînement (18) lors de l'ouverture de la première aiguille de buse (4).
  6. Soupape d'injection selon l'une quelconque des revendications 3 à 5, caractérisée en ce que la goupille de pression (22) coopère avec une plaque de soupape (15) servant de butée, dans laquelle sont disposés un étranglement d'entrée (10) et un étranglement de sortie (13) pour la commande de la pression de fluide dans l'espace de commande de soupape (9).
  7. Soupape d'injection selon la revendication 2, caractérisée en ce que le piston de commande coopère par son côté frontal opposé à l'espace de commande de soupape (9) avec la première aiguille de buse (4) et avec la deuxième aiguille de buse (5).
EP20040024922 2003-12-11 2004-10-20 Injecteur Expired - Fee Related EP1541859B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003157873 DE10357873A1 (de) 2003-12-11 2003-12-11 Einspritzventil
DE10357873 2003-12-11

Publications (2)

Publication Number Publication Date
EP1541859A1 EP1541859A1 (fr) 2005-06-15
EP1541859B1 true EP1541859B1 (fr) 2009-07-22

Family

ID=34485303

Family Applications (1)

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EP20040024922 Expired - Fee Related EP1541859B1 (fr) 2003-12-11 2004-10-20 Injecteur

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EP (1) EP1541859B1 (fr)
DE (2) DE10357873A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012002542A1 (de) 2012-02-09 2013-08-14 Volkswagen Aktiengesellschaft Verfahren zum Einspritzen von Kraftstoff in einen Brennraum eines Zylinders
DE102013000048B3 (de) * 2013-01-07 2014-06-12 L'orange Gmbh Doppelnadelinjektor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4475250B2 (ja) * 2005-06-06 2010-06-09 株式会社デンソー 燃料噴射弁およびその製造方法
JP2007132249A (ja) * 2005-11-09 2007-05-31 Denso Corp 燃料噴射装置
JP4294671B2 (ja) * 2006-01-26 2009-07-15 株式会社デンソー 燃料噴射装置
JP4226011B2 (ja) * 2006-02-16 2009-02-18 株式会社デンソー 燃料噴射装置
WO2014143213A1 (fr) 2013-03-14 2014-09-18 Energ2 Technologies, Inc. Matériaux composites carbonés comprenant des modificateurs électrochimiques d'alliage au lithium

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3332920A1 (de) * 1983-09-13 1985-03-21 Klöckner-Humboldt-Deutz AG, 5000 Köln Kraftstoffeinspritzduese
DE4115477C2 (de) * 1990-05-17 2003-02-06 Avl Verbrennungskraft Messtech Einspritzdüse für eine Brennkraftmaschine
AT3763U3 (de) * 1999-08-05 2000-12-27 Avl List Gmbh Nockenbetätigte einspritzeinrichtung für eine brennkraftmaschine
DE10133434A1 (de) * 2001-07-10 2003-01-23 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10205970A1 (de) * 2002-02-14 2003-09-04 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012002542A1 (de) 2012-02-09 2013-08-14 Volkswagen Aktiengesellschaft Verfahren zum Einspritzen von Kraftstoff in einen Brennraum eines Zylinders
DE102013000048B3 (de) * 2013-01-07 2014-06-12 L'orange Gmbh Doppelnadelinjektor

Also Published As

Publication number Publication date
EP1541859A1 (fr) 2005-06-15
DE10357873A1 (de) 2005-07-07
DE502004009781D1 (de) 2009-09-03

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