EP1727977B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1727977B1
EP1727977B1 EP05701507A EP05701507A EP1727977B1 EP 1727977 B1 EP1727977 B1 EP 1727977B1 EP 05701507 A EP05701507 A EP 05701507A EP 05701507 A EP05701507 A EP 05701507A EP 1727977 B1 EP1727977 B1 EP 1727977B1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
fuel
pressure
valve
throttle
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
EP05701507A
Other languages
German (de)
English (en)
Other versions
EP1727977A1 (fr
Inventor
Wolfgang Stoecklein
Peter Boehland
Godehard Nentwig
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1727977A1 publication Critical patent/EP1727977A1/fr
Application granted granted Critical
Publication of EP1727977B1 publication Critical patent/EP1727977B1/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
    • 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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Definitions

  • the invention is based on a fuel injection valve of an internal combustion engine according to the closer defined in the preamble of claim 1. Art.
  • Such a fuel injection valve is out of DE 102 05 970 A1 known and used for injection of fuel under high pressure in a combustion chamber of a motor vehicle internal combustion engine.
  • A1 known fuel injection valve comprises a housing with a nozzle module and a valve control module.
  • the valve control module is designed like a valve and can be actuated by means of an actuator acting on a valve closure member.
  • a pressure level in a valve control chamber is adjustable, which adjoins a needle unit of the nozzle module.
  • the needle unit comprises an outer nozzle needle, which is biased by a compression spring in the closing direction and is guided on the housing. In the outer nozzle needle, an inner nozzle needle is guided.
  • the inner nozzle needle is used to control a Injection of fuel via inner injection openings and the outer nozzle needle is used to control an injection via outer injection openings, wherein in a triggered by the valve control module pressure drop in the valve control chamber first the outer nozzle needle and subsequently the inner nozzle needle are moved in the open position. In a subsequent, triggered by the valve control module pressure increase in the valve control chamber, the two nozzle needles are moved simultaneously in the closed position.
  • the US 5,899,389 shows a fuel injection valve with - two coaxial successively guided valve needles.
  • the valve needles are either each acted upon by a spring and then open according to the fuel pressure is supplied to the injection valve for injection or the corresponding closing force on the valve needle is generated by the fuel pressure in a common control chamber, which determines the level of pressure in the control chamber, the pressure level can be, in which the inner and the outer valve needle opens.
  • a fuel injection valve which also has two nested valve needles.
  • the valve needles are pressed by the pressure in each one control chamber against a valve seat, wherein near the valve seat a transverse bore in the outer valve needle is formed, via which the fuel is introduced into the formed between the inner and the outer valve needle space.
  • the fuel injection valve according to the invention with the features according to the preamble of claim 1 and an outer nozzle needle with at least one transverse channel through which fuel to the periphery and to an inner pressure stage of the inner nozzle needle is feasible, offers the possibility of opening the needle unit first, the inner nozzle needle and then open the outer nozzle needle.
  • By appropriate design of the pressure levels of the inner and outer nozzle needle then optimized opening and closing speeds of the two nozzle needles can be achieved.
  • the outer nozzle needle is preferably guided in a sleeve disposed in the high-pressure space connected to the fuel supply passage, a leak-free fuel injection valve having two nozzle needles inserted into each other can be realized.
  • the fuel injection valve according to the invention may in particular be part of a common-rail injection system and serve for the injection of fuel under high pressure into a combustion chamber of a diesel internal combustion engine of a motor vehicle.
  • the fuel injection valve is connected on the inlet side to a high-pressure accumulator, the so-called common rail, which supplies all the fuel injection valves of the relevant internal combustion engine with high-pressure fuel.
  • the transverse channel of the outer nozzle needle may be provided with a throttle.
  • the inner nozzle needle In order to hold the inner nozzle needle in the closed position, it is expediently biased by a closing spring in the closing direction.
  • the closing spring is supported for example on an intermediate plate of a housing of the fuel injection valve.
  • the outer nozzle needle expediently biased by a further closing spring in the closing direction.
  • a driver is advantageously formed on the inner nozzle needle, which acts on the outer nozzle needle.
  • the driver is formed for example by the inner pressure stage.
  • the inner nozzle needle can be designed so that it acts in the open state as a throttle for a fuel flow into the valve control chamber and thus accelerates a lowering of the pressure level in the valve control chamber and thus the opening of the outer nozzle needle.
  • a fuel throttle is arranged in the fuel supply channel of the injection valve.
  • a fuel injection valve 10 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 fuel injection valve 10 includes, as essential components, a valve-type valve control module 12 and a nozzle module 14. Between the nozzle module 14 and the valve control module 12, a throttle plate 16 is arranged.
  • the nozzle module 14 is designed as a so-called coaxial vario nozzle and has a needle unit 18, which is arranged in a high-pressure chamber 20 of a nozzle housing 22 and an outer nozzle needle 24 and an inner nozzle needle 26 comprises.
  • the outer nozzle needle 24 is in one in the high pressure space 20 arranged, cylindrical sleeve 28 and is used to control the outer, leading to the combustion chamber of the internal combustion engine spray holes or injection ports 32.
  • the inner nozzle needle 26 is guided over a region 54 of increased diameter in the outer nozzle needle 24 and is used to control internal, also to the combustion chamber of the internal combustion engine leading spray holes or injection openings 34.
  • the inner injection holes 34 each have a smaller cross-section than the outer injection holes 32nd
  • the two nozzle needles 24 and 26 border with their spray ports 32 and 34 facing away from end faces to a valve control chamber 36 which is bounded radially from the cylindrical sleeve 28 and on the nozzle needles 24 and 26 side facing away from the throttle plate 16.
  • a valve control chamber 36 which is bounded radially from the cylindrical sleeve 28 and on the nozzle needles 24 and 26 side facing away from the throttle plate 16.
  • the position of the two nozzle needles 24 and 26 is adjustable.
  • first closing spring 38 which is supported on the sleeve 28 and engages a support 40 of the outer nozzle needle 24, biased in the closing direction.
  • the inner nozzle needle 26 is biased in the closing direction by means of a second closing spring 42, which is supported on the throttle plate 16 and acts on a bearing 44 formed by the enlarged diameter portion 54 of the inner nozzle needle 26.
  • the outer nozzle needle 24 further has a transverse channel 46, which has the high-pressure chamber 20 with an annular gap 48 between the outer nozzle needle 24 and the circumference of the inner nozzle needle 26 and with an inner pressure stage 50 of the inner nozzle needle 26 connects.
  • the pressure stage 50 is formed by the enlarged diameter portion 54 of the inner nozzle needle 26.
  • a throttle 52 is formed in the transverse channel 46.
  • the throttle plate 16 has a fuel throttle 60, which is assigned to the one leading to the high-pressure chamber 20 fuel supply channel 62, disposed between the fuel supply channel 62 and the valve control chamber 36, so-called inlet throttle 64, one between the valve control chamber 36 and a valve chamber 66 of the nozzle module 12th arranged, so-called outlet throttle 68 and a bypass channel 70 which is connected via a channel 72 to the fuel supply channel 62 and also leads to the valve control chamber 66.
  • a fuel throttle 60 which is assigned to the one leading to the high-pressure chamber 20 fuel supply channel 62, disposed between the fuel supply channel 62 and the valve control chamber 36, so-called inlet throttle 64, one between the valve control chamber 36 and a valve chamber 66 of the nozzle module 12th arranged, so-called outlet throttle 68 and a bypass channel 70 which is connected via a channel 72 to the fuel supply channel 62 and also leads to the valve control chamber 66.
  • the inlet throttle 64 is arranged centrally in the throttle plate 16, whereas the outlet throttle 68 is arranged eccentrically.
  • valve closure member 74 is arranged, which by means of a not shown here, preferably piezoelectric actuator is controllable.
  • the valve closure member 74 is biased by a biasing spring 76 in the closing direction.
  • An inflow of fuel to the spray holes 34 takes place from the fuel supply channel 62 via the fuel throttle 60, past the sleeve 28 in the high-pressure chamber 20 and then through the transverse channel 46 and the throttle 52 to the outside of the inner nozzle needle 26 and from there at open inner nozzle needle 26 to the spray holes 34th
  • the inner nozzle needle 26 and the outer nozzle needle 24 are held by the respective associated closing spring 42 and 38 and by the hydraulic pressure ratios when not driven piezoelectric actuator in the closed position.
  • the pressure surfaces of the inner nozzle needle 26 and the outer nozzle needle 24, ie, the spray holes 32 and 34 facing away from the two nozzle needles 24 and 26 and the inner pressure stage 50 of the inner nozzle needle 26 and the outer pressure stage 58 of the outer nozzle needle 24 are tuned so that the prevailing in the valve control chamber 36 opening pressure for the inner nozzle needle 26 is greater than that prevailing in the valve control chamber 36 opening pressure for the outer nozzle needle 24, which is based FIG. 2 is shown by way of example.
  • FIG. 2 shows a broken line for the inner nozzle needle 26 and a solid curve for the outer nozzle needle 24 an opening pressure p, which must prevail for opening the inner nozzle needle 26 and the outer nozzle needle 24 in the valve control chamber 36, wherein the opening pressure p as a function of the diameter D of inner nozzle needle 26 is shown.
  • the inner nozzle needle 26 has a seat diameter of 1.3 mm
  • the outer nozzle needle 24 has a seat diameter of 1.8 mm
  • the outer needle has a diameter of 4 mm
  • a rail pressure of 1 kbar is provided and in the relevant Combustion chamber a pressure of 50 bar prevails.
  • the inner nozzle needle 26 must have a diameter greater than 2.45 mm to allow the inner nozzle needle 26 to open in front of the outer nozzle needle 24. This means that only from this diameter D of the inner nozzle needle 26, the opening pressure of the inner nozzle needle 26 is greater than the opening pressure of the outer nozzle needle 24th
  • FIG. 3 1 shows a simulation of a stroke H for an inner nozzle needle based on a curve X and a stroke H for an outer nozzle needle on the basis of a curve Y in each case as a function of a driving time of the piezoelectric actuator for a fuel injection valve of the type shown in FIG.
  • FIG. 3 As shown, it can be seen that the inner nozzle needle opens earlier than the outer nozzle needle, so that fuel can be injected into the combustion chamber of the internal combustion engine in a stepped manner via the respective associated injection holes 32 and 34.
  • the piezoelectric actuator In the initial state, the piezoelectric actuator is in a de-energized state, so that the valve closing member 74 is in the closed position and in the valve control chamber 36 rail pressure prevails.
  • the valve closing member 74 Upon actuation of the piezoelectric actuator, the valve closing member 74 is moved in the open position, so that the fluid pressure in the valve control chamber 36 is lowered via the outlet throttle 68.
  • the fluid pressure prevailing in the valve control chamber 36 has dropped to the opening pressure required to open the inner nozzle needle 26, the latter opens.
  • the total stroke of the inner nozzle needle 26 is for example 0.2 mm, wherein the throttle plate 16 forms a stop.
  • the inner nozzle needle strikes against the throttle plate 18, whereupon the inner nozzle needle 26 largely throttles the supply of fuel via the inlet throttle 64 into the valve control chamber 36. This causes the pressure in the valve control chamber 36 to further decrease, so that the opening pressure required to open the outer nozzle needle 24 is exceeded.
  • This also opens the outer nozzle needle 24, so that fuel is injected via the outer injection holes 32 into the combustion chamber of the internal combustion engine.
  • valve closing member 74 When an injection of fuel into the combustion chamber is to be terminated, the valve closing member 74 is moved by the piezoelectric actuator in the closed position, so that the pressure in the valve control chamber 36 increases again to the rail pressure. At this time, the one in the High pressure chamber 20 prevailing pressure due to the throttling means of the fuel throttle 60 is less than the rail pressure. Due to the different pressure levels in the valve chamber 36 and the high-pressure chamber 20, a closing force is exerted on both needles. Characterized in that the pressure stage 50 acts as a driver, close the inner nozzle needle 26 and the outer nozzle needle 24 substantially simultaneously.
  • the piezoelectric actuator is moved to an intermediate position, whereby due to the effect of flowing over the bypass channel into the valve chamber 66 fuel, the pressure in the valve control chamber 36 does not drop so far that the outer nozzle needle 24th opens. Also, an opening of the outer nozzle needle 24 can be prevented by a Mehrfachbestromung the piezoelectric actuator.

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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 (5)

  1. Injecteur de carburant comportant un module de buse (12) dans lequel une aiguille d'injecteur (24), extérieure coopérant avec au moins un premier orifice d'injection (32), est entourée par une chambre de haute pression (20) reliée par un canal d'alimentation en carburant (62) et une aiguille d'injecteur (26), intérieure, guidée en coulissement axiale, coopérant avec au moins un second orifice d'injection (34) logé dans le canal traversant axialement l'aiguille extérieure (24), ainsi qu'un module de commande de soupape (12) réalisé à la manière d'une soupape commandant une pression de fluide régnant dans une chambre de commande soupape (36) munie d'un étranglement d'alimentation (64) et d'un étranglement de sortie (68), le niveau de la pression fixant la position de l'aiguille extérieure (24) et de l'aiguille intérieure (26) de l'injecteur,
    l'aiguille extérieure d'injecteur (24) ayant au moins un canal transversal (46) par lequel le carburant de la chambre haute pression peut passer sur la périphérie et sur un épaulement de poussée (50), intérieur de l'aiguille d'injecteur, intérieure (26),
    caractérisé en ce que
    le canal transversal (46) comporte un organe d'étranglement (52) et cet organe d'étranglement (52) est réalisé pour accorder la pression du carburant agissant sur l'épaulement de poussée (50), intérieur.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'aiguille d'injecteur, intérieure (26) est précontrainte dans le sens de la fermeture par un ressort de fermeture (42).
  3. Injecteur de carburant selon l'une des revendications 1 ou 2,
    caractérisé en ce que
    l'épaulement de poussée (50), intérieur de l'aiguille d'injecteur (26), intérieure, sert d'organe d'entraînement à l'aiguille d'injecteur extérieur (24).
  4. Injecteur de carburant selon l'une des revendications 1 à 3,
    caractérisé en ce que
    l'aiguille d'injecteur (26) intérieure, à l'état ouvert, fonctionne comme organe d'étranglement pour l'alimentation en carburant de la chambre de commande de soupape (36).
  5. Injecteur de carburant selon l'une des revendications 1 à 4,
    caractérisé en ce qu'
    un organe d'étranglement de carburant (60) est prévu dans le canal d'alimentation de carburant (62).
EP05701507A 2004-03-06 2005-01-13 Soupape d'injection de carburant Not-in-force EP1727977B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004011095A DE102004011095A1 (de) 2004-03-06 2004-03-06 Kraftstoffeinspritzventil
PCT/EP2005/050122 WO2005085624A1 (fr) 2004-03-06 2005-01-13 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1727977A1 EP1727977A1 (fr) 2006-12-06
EP1727977B1 true EP1727977B1 (fr) 2008-03-19

Family

ID=34877505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05701507A Not-in-force EP1727977B1 (fr) 2004-03-06 2005-01-13 Soupape d'injection de carburant

Country Status (4)

Country Link
EP (1) EP1727977B1 (fr)
AT (1) ATE389796T1 (fr)
DE (2) DE102004011095A1 (fr)
WO (1) WO2005085624A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006037175A1 (de) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Kraftstoffinjektor mit verbessert geführter Hubbewegung des Ventilschließgliedes
DE102006051583A1 (de) * 2006-11-02 2008-05-08 Robert Bosch Gmbh Kraftstoffinjektor mit Speichervolumensegment
GB0801997D0 (en) 2007-05-01 2008-03-12 Delphi Tech Inc Fuel injector
DE102009046336A1 (de) 2009-11-03 2011-05-05 Robert Bosch Gmbh Ventilanordnung eines Kraftstoffinjektors
US8690075B2 (en) 2011-11-07 2014-04-08 Caterpillar Inc. Fuel injector with needle control system that includes F, A, Z and E orifices

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5899389A (en) * 1997-06-02 1999-05-04 Cummins Engine Company, Inc. Two stage fuel injector nozzle assembly
US6705543B2 (en) * 2001-08-22 2004-03-16 Cummins Inc. Variable pressure fuel injection system with dual flow rate injector
DE10155227A1 (de) * 2001-11-09 2003-05-22 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10205970A1 (de) * 2002-02-14 2003-09-04 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10254186A1 (de) * 2002-11-20 2004-06-17 Siemens Ag Injektor mit einer direkt angetriebenen Register-Düsennadel für die Kraftstoffeinspritzung in einen Verbrennungsmotor

Also Published As

Publication number Publication date
WO2005085624A1 (fr) 2005-09-15
DE102004011095A1 (de) 2005-09-22
EP1727977A1 (fr) 2006-12-06
DE502005003321D1 (de) 2008-04-30
ATE389796T1 (de) 2008-04-15

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