EP1552135A1 - Dispositif d'injection de carburant destine a un moteur a combustion interne - Google Patents

Dispositif d'injection de carburant destine a un moteur a combustion interne

Info

Publication number
EP1552135A1
EP1552135A1 EP03740026A EP03740026A EP1552135A1 EP 1552135 A1 EP1552135 A1 EP 1552135A1 EP 03740026 A EP03740026 A EP 03740026A EP 03740026 A EP03740026 A EP 03740026A EP 1552135 A1 EP1552135 A1 EP 1552135A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injection
injection device
valve element
fuel
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.)
Granted
Application number
EP03740026A
Other languages
German (de)
English (en)
Other versions
EP1552135B1 (fr
Inventor
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 EP1552135A1 publication Critical patent/EP1552135A1/fr
Application granted granted Critical
Publication of EP1552135B1 publication Critical patent/EP1552135B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine, with a housing, with a recess in the housing, with at least two coaxially arranged in the recess
  • Valve elements each cooperate with a corresponding valve seat and 'associated with passage opening where at least a Kraftsto f-stop, and is limited by at least one control space which is assigned by a gauge pressure surface whose
  • Resulting force is directed towards the valve seat of the valve element during operation.
  • a fuel injection device of the type mentioned is known from DE 100 58 153 AI. It is an injector that is used in internal combustion engines with direct fuel injection.
  • Two elongated coaxial valve needles are arranged in an elongated housing.
  • the outer Valve needle is pressure controlled. This means that by increasing a pressure in a pressure chamber, which is delimited in some areas by a pressure flank on the outer valve element, the outer valve element is lifted from the corresponding valve seat against the application force by a compression spring.
  • the inner valve element is stroke-controlled. This means that a control room is assigned to it, which is normally under high pressure. Due to this high pressure, the valve element is pressed against the valve seat against an application force.
  • the pressure in the control chamber can, however, be briefly reduced, as a result of which the valve element is only subjected to a lower force in the direction of the valve seat. Since there is still an application force that tries to lift the valve element from the valve seat, when the fuel pressure in the control chamber is reduced, the inner valve element moves away from the valve seat.
  • the object of the present invention is to develop a fuel injection device of the type mentioned at the outset in such a way that it is as compact as possible and can be produced inexpensively.
  • control spaces are present, each of which is assigned a valve element with a pressure surface, the resultant force of which, in operation, is directed toward the valve seat of the valve element hm, the control spaces being arranged coaxially with one another and approximately at the same axial height are.
  • the fuel injection device according to the invention has the advantage that both valve elements are stroke-controlled and still have a very compact construction.
  • the stroke control of the valve elements by briefly reducing the pressure in the respective control room enables the valve elements to be switched very precisely.
  • the coaxial arrangement and the arrangement at the same height of the control spaces enables a short and narrow construction of the injection device.
  • control spaces are separated from one another by a sleeve-like separating element.
  • a sleeve-like separating element can be produced simply and inexpensively.
  • the sleeve-like separating element is a separate part and is acted upon by a clamping device with a sealing edge against the pressure surface of one of the valve elements.
  • the manufacture of the sleeve-like separating element is further simplified.
  • the sleeve-like separating element can be a piece of pipe.
  • Another embodiment of the fuel injection device according to the invention is characterized in that at least one valve element is acted against its sealing seat by a tensioning device which acts on a sleeve-like separating element.
  • the tensioning device not only serves to act on the sleeve-like separating element in such a way that a secure sealing of the control chamber is ensured, but at the same time it also ensures a certain preload of the valve element against its sealing seat. It is particularly advantageous if the fuel system or the internal combustion engine, in which the fuel injection device is used, is not currently being operated and the corresponding control spaces are therefore more or less depressurized.
  • Spanneini xchtung supported on a support ring which is connected to the radially outer valve element.
  • control chamber of the radially outer valve element It is particularly easy to supply the control chamber of the radially outer valve element with fluid under high pressure if the control chamber of the radially outer valve element is connected to a high-pressure connection via a channel m to the sleeve-like separating element, which delimits the control chamber from the outside is.
  • a channel can easily be realized through a hole in the wall of the separating element. Its diameter can be selected so that it simultaneously represents or comprises an inflow throttle into the control chamber.
  • a particularly preferred development of the fuel injection device according to the invention is characterized in that it comprises a 3/3-way valve which is connected to a low-pressure connection and to the two control spaces.
  • the movements of the at least two valve elements can thus be controlled with a single valve.
  • the corresponding fuel injection device is particularly compact in this case and is inexpensive. Installation is also easier because fewer connections have to be connected.
  • both valve elements rest on their valve seats, in a second switching position the radially outer valve element is lifted from its valve seat and the radially inner valve element lies on the valve seat, and in one third switching position both valve elements are lifted from their valve seats.
  • Figure 1 is a schematic representation of a
  • Figure 2 is a partial section through one of the
  • FIG. 3 shows an enlarged illustration of a region of the fuel injection device from FIG. 2.
  • Reference numeral 10 It comprises a fuel tank 12, from which an electric fuel pump 14 requests fuel into a low-pressure fuel line 16. This leads to a high-pressure fuel pump 18.
  • the high-pressure fuel pump 18 is a piston pump which is driven by a camshaft (not shown) of an internal combustion engine (likewise not shown), to which the fuel system 10 belongs.
  • the high-pressure fuel pump 18 compresses the fuel to a very high pressure and prompts it to
  • Fuel manifold 20 This is also referred to as a "rail".
  • the fuel is stored under high pressure in it.
  • a plurality of fuel injection devices 22 are connected to the fuel line 20. For this purpose, they have high-pressure connections 24.
  • the fuel injection devices 22 inject the fuel directly into combustion chambers 26 of the internal combustion engine assigned to them.
  • the fuel injection devices 22 each also have a low-pressure connection 28, from which a return line 30 leads back to the fuel tank 12.
  • the operation of the internal combustion engine, the fuel system 10 and, in particular, the fuel injection devices 22 is controlled or regulated by a control and regulating device 32. For this purpose, this is connected to the fuel injection devices 22 via lines (without reference numerals).
  • the fuel system shown in Figure 1 can be used in both gasoline and diesel engines.
  • the fuel injection devices 22 comprise a housing which comprises a nozzle body 34, an intermediate piece 36, and an upper end piece 38.
  • a recess 40 is provided in the nozzle body 34, and there are two coaxially arranged valve elements 42 and 44.
  • the outer tubular valve element 42 works together with a valve seat 46, which is present in the lower region of the recess 40 in FIG. 2. Exit openings 48 are also assigned to it.
  • the inner valve element 44 cooperates with a valve seat 50, and fuel outlet openings 52 are assigned to it.
  • the outer valve element 42 is guided in the recess 40.
  • the inner valve element 44 is guided in the outer valve element 42.
  • the outer jacket pool of the outer valve element 42 has a shoulder 54 in the area of the upper end of the outer valve element 42 in FIG. A support ring 56 bears against this.
  • On the support ring 56 in turn supports one end of a compression spring 58, the other end of which acts on a first sealing sleeve 60 against the intermediate piece 36.
  • the first sealing sleeve 60 is pushed onto the upper end of the outer valve element 42 in a fluid-tight manner. However, the first sealing sleeve 60 and the outer valve element 42 can be moved relative to one another at least in the axial direction.
  • the first sealing sleeve 60 has a tapering circumferential sealing edge 62 on its upper edge in FIG. 2. In the area of this tapered sealing edge 62, a radial channel 64 is worked through the sealing sleeve at one point of the first sealing sleeve 60.
  • the upper edge of the outer valve element 42 in FIG. 2 forms a flat annular surface, which represents an annular pressure surface 66. Their meaning will be explained in more detail below.
  • annular recess 68 which is open towards the nozzle body 34.
  • a compression spring 70 is supported, the other end of which acts on an edge of a second annular sealing sleeve 72.
  • the second sealing sleeve 72 is guided in the annular recess 68 in a sliding and fluid-tight manner. Your lower in Figure 2
  • the edge tapers to a point and forms a sealing edge 74. This lies against an upper end face of the inner valve element 44.
  • This upper end surface forms a pressure surface 76 in a manner to be explained in more detail below.
  • the diameter of the sealing edge 74 of the second sealing sleeve 72 is somewhat smaller than the outer diameter of the inner valve element 44.
  • the compression spring 58, the first sealing sleeve 60, the compression spring 70, the second sealing sleeve 72 and the two valve elements 42 and 44 are arranged coaxially to one another.
  • An outer annular control chamber 78 is present between the two sealing sleeves 60 and 72, the pressure surface 66 on the outer valve element 42 and the intermediate piece 36.
  • An inner control space 80 is formed between the circular pressure surface 76 of the inner valve element 44, the second sealing sleeve 72 and the intermediate piece 36.
  • valve element 84 is actuated by a piezo actuator 88 via a tappet 86.
  • the valve element 84 is arranged in a control chamber 90 and cooperates with an upper valve seat 92 in FIGS. 2 and 3 and a lower valve seat 94 in FIGS. 2 and 3.
  • a central channel 96 leads from the 3/3-way valve 82 via an outflow throttle 98 to the inner control chamber 80.
  • an off-center channel 100 also leads from the 3/3 way valve 82 via an outflow throttle 102 to the outer annular control chamber 78.
  • a channel 104 leads from the 3/3-way valve 82 to
  • Low-pressure connection 28 This is also connected via a leakage channel 106 to the annular recess 68 in the intermediate piece 36.
  • a channel 108 leads from the high-pressure connection 24 in the upper end piece 38 and in the intermediate piece 36 to the recess 40 in the nozzle body 34.
  • Another channel 110 leads obliquely from the high-pressure connection 24 via an inflow throttle 112 to the central channel 96. From the recess 40, one leads to the longitudinal axis of the recess 40 parallel channel 114 to one in the lower area of the Recess 40 existing annular space 116.
  • the fuel injection device 22 shown in FIGS. 2 and 3 operates as follows:
  • the piezo actuator 88 is controlled by the control and regulating device 32 such that the valve element 84 of the 3/3-way valve 82 comes into contact with the lower valve seat 94.
  • edozh can now use the outflow throttle 102, the flow channel 100, the control chamber 90 and the channel 104 to fuel from the annular control chamber 78 of the outer valve element 42 for low pressure connection 28 flow out.
  • Piezo actuator 88 is controlled by the control and regulating device 32 such that the valve element 84 is in a middle switching position, that is to say neither in contact with the upper valve seat 92 nor in contact with the lower valve seat 94. In this case, both control spaces 78 and 80 are connected to the low pressure connection 28. Analogously to what has been described above, the amount of the resultant force which acts on the pressure surface 76 of the inner valve element 44 thus decreases, and the inner valve element 44 can move radially outward from the
  • control spaces 78 and 80 are arranged coaxially with one another and at approximately the same axial height.
  • the control spaces 78 and 80 are essentially sealed by the sealing sleeves 60 and 72.

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 (22) destiné à un moteur à combustion interne, comportant un boîtier (34, 36, 38). Ledit boîtier (34, 36, 38) comporte une cavité (40) contenant deux éléments de soupape (42, 44) logés de façon coaxiale l'un par rapport à l'autre, interagissant respectivement avec un siège de soupape correspondant (46, 50). Des orifices de sortie de carburant (48, 52) sont affectés respectivement aux éléments de soupape. Au moins une chambre de commande (78, 80) est délimitée par une surface de pression (66, 76) affectée à un élément de soupape (42, 44), dont la résultante de force est dirigée vers le siège de soupape (46, 50) de l'élément de soupape (42, 44) en utilisation. L'invention vise à mettre en oeuvre un tel dispositif d'injection de carburant (22) précis et de construction compacte. A cet effet, ledit dispositif comporte au moins deux chambres de commande (78, 80) se voyant affecter respectivement un élément de soupape (42, 44) présentant une surface de pression (66, 76), dont la résultante de force est dirigée vers le siège de soupape (46, 50) de l'élément de soupape (42, 44) en utilisation, lesdites chambres de commande (78, 80) étant disposées de façon coaxiale l'une par rapport à l'autre et environ à la même hauteur axiale.
EP03740026A 2002-10-09 2003-05-23 Dispositif d'injection de carburant destine a un moteur a combustion interne Expired - Lifetime EP1552135B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10246974 2002-10-09
DE2002146974 DE10246974A1 (de) 2002-10-09 2002-10-09 Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine
PCT/DE2003/001676 WO2004033890A1 (fr) 2002-10-09 2003-05-23 Dispositif d'injection de carburant destine a un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1552135A1 true EP1552135A1 (fr) 2005-07-13
EP1552135B1 EP1552135B1 (fr) 2006-06-14

Family

ID=32038355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03740026A Expired - Lifetime EP1552135B1 (fr) 2002-10-09 2003-05-23 Dispositif d'injection de carburant destine a un moteur a combustion interne

Country Status (3)

Country Link
EP (1) EP1552135B1 (fr)
DE (2) DE10246974A1 (fr)
WO (1) WO2004033890A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10326043A1 (de) * 2003-06-10 2004-12-30 Robert Bosch Gmbh Einspritzdüse für Brennkraftmaschinen
DE10334209A1 (de) * 2003-07-26 2005-02-10 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
DE10343998A1 (de) * 2003-09-23 2005-04-14 Robert Bosch Gmbh Einspritzdüse
WO2005119045A1 (fr) * 2004-06-03 2005-12-15 Siemens Aktiengesellschaft Soupape d'injection
DE102004030445A1 (de) * 2004-06-24 2006-01-12 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102004032700B3 (de) * 2004-07-06 2005-10-06 Siemens Ag Kraftstoffinjektor mit einem Kugelsitz für ein zweistufiges Servoventil
DE102004036367B3 (de) * 2004-07-27 2005-10-13 Siemens Ag Einspritzventil
DE102004041172B3 (de) * 2004-08-25 2006-01-05 Siemens Ag Einspritzventil
DE102004051406B4 (de) * 2004-10-21 2008-03-20 Siemens Ag Kraftstoffinjektor mit einer im Düsenkörper geführten Hohlnadel einer Registerdüse
DE102004051756A1 (de) * 2004-10-23 2006-04-27 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102004060550A1 (de) * 2004-12-16 2006-07-06 Robert Bosch Gmbh Kraftstoffeinspritzdüse
DE102005001284A1 (de) * 2005-01-11 2006-07-20 Siemens Ag Kraftstoffinjektor mit einer Registerdüse, deren innere Düsennadel in einem Nadelführungskörper geführt wird
DE102005016796A1 (de) * 2005-04-12 2006-10-19 Robert Bosch Gmbh Zweistufig öffnender Kraftstoffinjektor
DE102005023368B4 (de) * 2005-05-20 2008-09-11 Continental Automotive Gmbh Düsenbaugruppe für ein Einspritzventil und Einspritzventil
DE102005042786B4 (de) * 2005-09-08 2009-04-16 Siemens Ag Kraftstoffinjektor mit hermetisch abgedichtetem Hydrauliksystem
DE102005046669A1 (de) * 2005-09-29 2007-04-05 Robert Bosch Gmbh Lochdüse für eine Kraftstoff-Einspritzvorrichtung eines Kraftstoff-Einspritzsystem
EP2049788A1 (fr) 2006-08-09 2009-04-22 Siemens Aktiengesellschaft Dispositif d'injection de combustible pour un moteur à combustion
DE102007011685A1 (de) 2007-03-09 2008-09-11 Robert Bosch Gmbh Kraftstoffinjektor mit verbessertem Steuerventil
JP4772016B2 (ja) 2007-09-07 2011-09-14 トヨタ自動車株式会社 内燃機関の燃料噴射制御装置
DE102014211287A1 (de) 2014-06-12 2015-12-17 Engineering Center Steyr Gmbh & Co. Kg Fluid-Einspritzvorrichtung für eine Verbrennungskraftmaschine

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GB9709678D0 (en) * 1997-05-14 1997-07-02 Lucas Ind Plc Fuel injector
GB0021296D0 (en) * 2000-08-30 2000-10-18 Ricardo Consulting Eng A dual mode fuel injector
DE10122241A1 (de) * 2001-05-08 2002-12-05 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
US6637675B2 (en) * 2001-07-13 2003-10-28 Cummins Inc. Rate shaping fuel injector with limited throttling

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Title
See references of WO2004033890A1 *

Also Published As

Publication number Publication date
WO2004033890A1 (fr) 2004-04-22
DE10246974A1 (de) 2004-04-22
EP1552135B1 (fr) 2006-06-14
DE50303869D1 (de) 2006-07-27

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