EP0692624B1 - Doppelstrahl-Kraftstoffeinspritzdüse mit parallelen Kernen und Luftspalten für Einspritzbrennkraftmaschinen - Google Patents

Doppelstrahl-Kraftstoffeinspritzdüse mit parallelen Kernen und Luftspalten für Einspritzbrennkraftmaschinen Download PDF

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Publication number
EP0692624B1
EP0692624B1 EP19950401647 EP95401647A EP0692624B1 EP 0692624 B1 EP0692624 B1 EP 0692624B1 EP 19950401647 EP19950401647 EP 19950401647 EP 95401647 A EP95401647 A EP 95401647A EP 0692624 B1 EP0692624 B1 EP 0692624B1
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EP
European Patent Office
Prior art keywords
core
stopper
injection nozzle
calibrated
return spring
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Expired - Lifetime
Application number
EP19950401647
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English (en)
French (fr)
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EP0692624A1 (de
Inventor
Michael Pontoppidan
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Marelli France SAS
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Magneti Marelli France SAS
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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0667—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature acting as a valve or having a short valve body attached thereto
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures

Definitions

  • the invention relates to a fuel injector, of the so-called “twin-jet” type for feeding a motor to internal combustion, in particular with at least two valves intake per engine cylinder, by injection of fuel selectively in one or each of two conduits of air intake manifold per cylinder (EP-A-337,763).
  • the invention therefore relates to the field of injectors of fuel used in automobile engines equipped an injection fuel supply system, and the injector according to the invention advantageously finds its application to the equipment of injection engines fitted with at least two intake valves per cylinder.
  • these engines in order to meet various requirements necessary to ensure the smooth running of the combustion, and in particular to control the degree of homogeneity of the air-fuel mixture in the combustion chambers and regulate the acoustic tuning of the engine by providing the torque performance sought, it has been proposed to supply each combustion chamber with several air intake ducts, and ultimately as much as the combustion chamber has intake valves, in order to regulate the supply of each combustion chamber by controlling the opening of one or more conduits opening upstream of the intake valves of this room.
  • twin-jet injector which, at reduced engine load, operates as an injector mono-jet, injecting a jet into a first conduit of air intake manifold and directed to the first intake valve, then, at high engine load, which operates as a twin-jet injector, i.e. delivering, plus the first jet, a second jet of fuel injected into the second air intake manifold duct and directed to the second intake valve.
  • twin-jet injector the formation of the fuel mixture in the combustion chamber are better managed, further closing more or less one of the collector ducts of each combustion chamber by a secondary butterfly, downstream of the main throttle regulating the air supply of the intake manifold, while ensuring the preparation of a good air-fuel mixture.
  • twin-jet type with hydraulic spraying provided by a mechanical device, the injector nose of which has two calibrated fuel jet outlet, pin holes divergent from each other and oriented towards two corresponding collector ducts, the body of which of injector contains a first electromagnet, comprising a first control winding, supplied with current in all or nothing, to move an integral core in translation of a first shutter relative to a first hole calibrated, in order to deliver a first jet when the first shutter is moved away from the first calibrated hole by displacement of the core against a stop, against a first spring.
  • the injector also includes a second electromagnet, co-linear to the first, and a second of which control winding is also electrically powered in all or nothing, to move, against a second return spring, stopper and slide core secured in translation with a second shutter, thus moved away from the second calibrated hole, so as to deliver a second jet through the second calibrated hole.
  • Winding supply of the second electromagnet thus releases the stop limiting the stroke of the core and simultaneously clear the second calibrated hole to deliver the second jet in addition to the first.
  • each of the two shutters is recalled, with the core, in closing position of the corresponding calibrated hole by the corresponding return spring.
  • This known injector certainly has the advantages mentioned above, but also the disadvantage of having a crew mobile with large stroke, because the core delimits with the stop device with rectilinear displacement one, respectively two variable air gaps which add up, which is the cause of low electromagnetic efficiency.
  • the problem underlying the invention is to remedy to this disadvantage, and the invention aims to provide a more efficient twin-jet type injector with magnetic circuit, more compact in structure and better suited to various practice requirements.
  • the invention provides an injector of the twin jet type as defined above, comprising a first shutter, integral in translation with a first core electromagnet, and returned to a closed position a first calibrated outlet hole by a first spring recall, against which the first shutter is separated from the first calibrated outlet hole by the power supply electric of an electromagnet control winding, to deliver a first jet of fuel, which characterized in that it further comprises a second shutter, integral in translation with a second electromagnet core, the two cores being arranged so that they are parallel and define with the armature of the electromagnet two parallel variable air gaps, the second shutter being returned to a closed position of the second calibrated outlet hole by a second spring reminder, against which the second shutter is discarded of the second calibrated outlet hole, to deliver a second jet of fuel, by the power supply of the same control winding with a second current level, higher than a first level of current necessary for control the movement of the first shutter and the first core against the first return spring.
  • the injector of the invention thus makes it possible to modulate fuel flow by varying the number of jets of fuel, oriented differently, depending on the load of the motor, by moving a first core and a first shutter against a first spring when the single control winding is powered by a first current threshold, to clear the calibrated hole of the first jet, while the second core and the second shutter are moved against the second spring when the single winding is powered by a second threshold of current, greater than the first, for example equal to double, to clear the calibrated hole of the second jet.
  • the two nuclei are coaxial with the single cylindrical control winding, and one at less of the nuclei is tubular and surrounds the other, which provides good compactness to the injector, as well as good electromagnetic efficiency by the fact that the two parallel air gaps are axial and short.
  • one at less than two calibrated outlet holes can be provided in a frustoconical tablet, forming a seat, and cooperating with a also frustoconical and coaxial obturator, but, advantageously, at least one of the two calibrated holes of outlet is formed in a flat pellet and cooperates with a planar shutter, the pellet and the planar shutter being substantially perpendicular to the axis of the winding of control, which further improves the axial compactness of the injector.
  • both cores are tubular, and the central core has a central fuel supply channel of at least one at least two calibrated outlet and / or housing holes partial of a corresponding return coil spring.
  • the two cores are separated from each other by an axial guide element in a magnetic material anchored in a frame of the electromagnet, and magnetic permeability and / or cross-section chosen so that this guide element is magnetically saturated for the value of the first current threshold winding supply.
  • this guide element is also tubular and coaxial, and the core return spring tubular outer is helical and at least partially housed in an annular chamber delimited between the element of guide and the outer core.
  • each shutter is advantageously of a single piece with the core of which it is integral in translation, at the end of this core on the side opposite the reinforcement of the electromagnet.
  • the first core central, houses its return spring, and is integral a plane shutter cooperating with the first calibrated hole formed in a flat pellet, at the end of a tip of the nose of the injector, and is surrounded by the second core, one of which frustoconical end constitutes the second obturator, cooperating with the second calibrated outlet hole provided in a frustoconical part of the nozzle of the injector nose.
  • the twin-jet injector partially shown in the single figure includes a body 1, essentially cylindrical of circular section, the end of which is intended to be facing the two intake manifold pipes of air to be supplied with fuel is arranged at the injector nose 2 having the shape of a coaxial cylindrical-conical tip to body 1 around the longitudinal axis X-X of the injector.
  • Body 1 envelops a single coil electromagnet control 3, which is cylindrical tubular with axis X-X, and surrounds a fixed internal frame, partially shown in 4.
  • the electromagnet also includes two cores coaxial and tubular 5 and 6, of which the first 5 is a central or internal nucleus surrounded by the second 6, or nucleus external.
  • the two nuclei 5 and 6, of general external shape cylindrical each delimits between the frame 4 and the face planar end facing cores 5 and 6, one of two variable air gaps 7 and 8, which have a low axial dimension and are parallel to each other.
  • These two air gaps 7 and 8 are provided on either side of a tubular element 9, made of magnetic material with permeability and / or section as it is saturated for the value of first current threshold I1 for supplying the winding 3, as described below.
  • This element 9, of general shape cylindrical has an axial end which is anchored in the armature 4, and extends between the cores 5 and 6.
  • This tubular element 9 constitutes an axial guide element nuclei 5 and 6, the first of which, or internal core 5 is axially spaced from the frame 4 by a first spring helical compression 10.
  • the spring 10 is essentially housed in the central channel of the central tubular core 5, and bears at one end against the anchoring part of element 9 in reinforcement 4, around a channel central 11 of this frame, which is a supply channel in fuel from the inlet (not shown) of the injector.
  • the other end of the spring 10 is supported against a shoulder 12 projecting radially inwards of the central canal of the central nucleus 5.
  • the end of the nucleus central 5, on the side opposite to the frame 4, is of a single part with a plane shutter 13, perpendicular to the axis X-X, and normally applied, by spring 10, against a flat and radial patch 14 closing the end of the end-piece cylindro-conical nozzle nose 2, and in which is formed a first calibrated jet outlet hole 15, of which the axis is inclined from the inside to the outside of the injector and on the right (in the figure) of the X-X axis of the injector.
  • the external tubular core 6 is also normally axially spaced from the frame 4 by a second spring helical compression 16, one end of which is supported against the frame 4, around the recess of the element tubular guide 9 in the frame 4, and which is housed in an annular chamber delimited between element 9 and the outer core 6, so the other end of the second spring 16 bears against an internal radial shoulder 17 of the outer core 6.
  • the second spring 16 thus applies a second shutter 18, constituted by the frustoconical end of the outer core 6, on the side opposite to the armature 4, in closed position of a second calibrated outlet hole 19, formed in the frustoconical and coaxial pad 20 connecting the flat end pad 14 to the cylindrical wall of the cylindrical-conical tip of the nose 2.
  • the second hole calibrated 19 is such that its axis is inclined from the inside to the outside of the injector and to the left (on the figure) of the injector X-X axis, i.e. on the side opposite the axis of the first calibrated hole 15, so that the jets coming out through these calibrated holes 15 and 19 are divergent and can each be directed to one respectively the two air intake manifold ducts corresponding, for the injection of fuel into the air admitted in these conduits.
  • the first nucleus or nucleus internal 5, parallel and coaxial to the second core 6, is recalled to rest position (closed position of first calibrated hole 15) by the first spring 10, and it is axially movable, against this spring 10, on an axial stroke defined by the first air gap 7.
  • the second core 6, surrounding coaxially the first 5, is recalled to the rest position (sealed closing position of the second calibrated hole 19) by the second spring 16, with a force greater than that exerted on the central core 5 by the first spring 10, and the outer core 6 is axially movable, against the second spring 16, on an axial stroke defined by the second air gap 8, which is magnetically parallel to the first air gap 7.
  • the injector is controlled as follows: the central core 5 is moved axially against the force of the return spring 10 when the single winding 3 of the solenoid the injector is supplied with a first current threshold I1, corresponding to the magnetic saturation of the element of tubular guide 9, for example 3 amperes for a network vehicle electrical system with a nominal voltage of 12 Volts.
  • the shutter 13 releases the first calibrated hole 15, which is thus supplied with pressurized fuel from central channel 21 of the central core 5, in the extension of the central channel 11 of the armature 4, and thanks to the small radial channel 22 opening laterally in the core 5, beyond the end of the guide element 9, therefore directly facing the base of the frustoconical part 20.
  • the calibrations of springs 10 and 16 as well as the realization of the control winding 3, of the armature 4, cores 5 and 6 and in particular of the surfaces crossed by the magnetic flux between the cores and the armature are made so that the outer core 6 is moved axially against the force of the second spring 16 when winding 3 is supplied with a second threshold of electric current I2, which corresponds to the saturation state the tubular part of the nose 2, and which is greater than the first current threshold I1, for example by a factor of two, that is to say of the order of 6 amperes in this example.
  • the outer core 6 then releases the second calibrated hole 19, which is also supplied with pressurized fuel, so that it delivers a second jet of fuel diverging from the first jet coming out of the first calibrated hole 15.
  • the two springs 10 and 16 recall the cores 5 and 6 in the closed position of the calibrated holes 15 and 19 by the shutters 13 and 18 respectively, which interrupts the two jets.
  • the injector returns to the initial position of the single figure.

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

Claims (10)

  1. Doppelstrahlkraftstoffeinspritzdüse zur Speisung eines Motors mit interner Verbrennung, insbesondere mit wenigstens zwei Einlaßventilen pro Verbrennungskammer des Motors, durch Kraftstoffeinspritzung selektiv in die eine oder jede der beiden Lufteinlaßsammelleitungen pro Verbrennungskammer, durch jeweils die eine (15) oder jede der beiden Kalibrierbohrungen (15,19) für den Austrittsstrahl, die gegeneinander divergente Achsen aufweisen und gegen die beiden Leitungen gerichtet und in einer Nase (2) ausgespart sind, die gegen die beiden Sammelleitungen gerichtet ist, von einem Einspritzdüsenkörper (1), der außerdem einen ersten Verschluß (13) aufweist, der in Translation fest mit einem ersten Elektromagnetkern (5) ist und gegen eine Verschlußposition einer ersten Ausgangskalibrierbohrung (15) durch eine erste Rückstellfeder (10) gehalten ist, wohingegen der erste Verschluß (13) von der ersten Ausgangskalibrierbohrung (15) durch elektrische Speisung einer Steuerwicklung (3) des Elektromagneten beiseite geschoben wird, um einen ersten Kraftstoffstrahl zu liefern,
    dadurch gekennzeichnet,
    daß sie außerdem einen zweiten Verschluß (18) aufweist, der in Translation fest mit einem zweiten Kern (6) eines Elektromagneten ist, wobei die beiden Kerne (5,6) derart angeordnet sind, daß sie parallel sind und mit der Armatur (4) des Elektromagneten zwei variable parallele Eisenspalte (7,8) begrenzen, wobei der zweite Verschluß (18) gegen eine Verschlußposition der zweiten Ausgangskalibrierbohrung (19) durch eine zweite Rückstellfeder (16) gehalten wird, wohingegen der zweite Verschluß (18) von der zweiten Ausgangskalibrierbohrung (19) beiseite geschoben wird, um einen zweiten Kraftstoffstrahl zu liefern, durch elektrische Speisung der Steuerwicklung (3) mit einem zweiten Stromniveau (I2), das oberhalb eines ersten Stromniveaus (I1) ist, das notwendig ist, um die Verschiebung des ersten Verschlusses (13) und des ersten Kerns (5) gegen die erste Rückstellfeder (10) zu steuern.
  2. Einspritzdüse nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die beiden Kerne (5,6) koaxial mit der einzigen zylindrischen Steuerwicklung (3) sind und daß wenigstens einer (6) der Kerne rohrförmig ist und den anderen (5) umgibt.
  3. Einspritzdüse nach Anspruch 2,
    dadurch gekennzeichnet,
    daß die beiden Kerne (5,6) rohrförmig sind und daß der zentrale Kern (5) einen zentralen Kanal (21) zur Kraftstoffspeisung der wenigstens einen der beiden Ausgangskalibrierbohrungen (15,19) und/oder der wenigstens bereichsweisen Aufnahme einer entsprechenden spiralförmigen Rückstellfeder (10) aufweist.
  4. Einspritzdüse nach irgendeinem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet,
    daß die beiden Kerne (5,6) gegeneinander durch ein axiales Führungselement aus einem magnetischen Material getrennt sind, das in einer Armatur (4) des Elektromagneten verankert ist und eine Permeabilität und/oder einen Querschnitt aufweist, derart, daß das Führungselement (9) für den ersten Stromschwellwert (I1) der Speisung der Wicklung (3) magnetisch gesättigt wird.
  5. Einspritzdüse nach Anspruch 4 in seiner Rückbeziehung auf den Anspruch 3,
    dadurch gekennzeichnet,
    daß das Führungselement (9) außerdem rohrförmig und koaxial und daß die Rückstellfeder (16) des äußeren rohrförmigen Kerns (6) spiralförmig ist und wenigstens teilweise in einer ringförmigen Kammer aufgenommen ist, die zwischen dem Führungselement (9) und dem externen Kern (6) begrenzt wird.
  6. Einspritzdüse nach irgendeinem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet,
    daß wenigstens eine (15) der beiden Ausgangskalibrierbohrungen in einer ebenen Platte ausgespart ist und mit einem ebenen Verschluß (13) zusammenwirkt, wobei die ebene Platte (14) und der ebene Verschluß (13) etwa rechtwinklig zur Achse (X-X) der Steuerwicklung (3) sind.
  7. Einspritzdüse nach irgendeinem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet,
    daß wenigstens eine (19) der beiden Ausgangskalibrierbohrungen in einer kegelstumpfartigen Platte (20) ausgespart ist und mit einem Verschluß (18) zusammenwirkt, der ebenfalls kegelstumpfartig und koaxial ist.
  8. Einspritzdüse nach irgendeinem der Ansprüche 1 bis 7,
    dadurch gekennzeichnet,
    daß jeder Verschluß (13,18) aus einem einzigen Stück mit dem Kern (5,6) ist, mit dem er fest in Translation ist, am Ende dieses Kerns (5,6) an der gegenüberliegenden Seite der Armatur (4) des Elektromagneten.
  9. Einspritzdüse nach irgendeinem der Ansprüche 1 bis 8,
    dadurch gekennzeichnet,
    daß der zentrale erste Kern (5) seine Rückstellfeder (10) aufnimmt und fest mit einem ebenen Verschluß (13) ist, der mit der ersten Kalibrierbohrung (15) zusammenwirkt, die in einer ebenen Platte (14) ausgespart ist, am Ende eines Vorsprunges der Nase (2) der Einspritzdüse, und von dem zweiten Kern (6) umgeben ist, dessen kegelstumpfartiges Ende den zweiten Verschluß (18) bildet und mit der zweiten Ausgangskalibrierbohrung (19) zusammenwirkt, die in einem kegelstumpfartigen Teil (20) des Vorsprungs der Nase (2) der Einspritzdüse ausgespart ist.
  10. Einspritzdüse nach irgendeinem der Ansprüche 1 bis 9,
    dadurch gekennzeichnet,
    daß die einzige Wicklung (3) des Elektromagneten, die Armatur (4) des Elektromagneten, die magnetischen Austauschoberflächen mit den Kernen (5,6) und das Führungselement (9) und die Rückstellfedern (10,16) derart verwirklicht sind, daß das zweite Niveau (I2) des Steuerstromes ausreicht, um die Verschiebung des zweiten Verschlusses (18) und des zweiten Kerns (6) gegenüber der zweiten Rückstellfeder (16) zu steuern, nach der Verschiebung des ersten Verschlusses (13) und des ersten Kerns (15) gegenüber der ersten Rückstellfeder (10), die hervorgerufen wird durch den Durchtritt eines Stromes mit dem ersten Niveau (I1) durch die Steuerwicklung (3), wobei das zweite Niveau etwa doppelt so groß wie das erste Niveau des Stroms (I1) ist.
EP19950401647 1994-07-12 1995-07-07 Doppelstrahl-Kraftstoffeinspritzdüse mit parallelen Kernen und Luftspalten für Einspritzbrennkraftmaschinen Expired - Lifetime EP0692624B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9408645 1994-07-12
FR9408645A FR2722538B1 (fr) 1994-07-12 1994-07-12 Injecteur de carburant "bi-jet" a noyaux et entrefers en parallele pour moteur a combustion interne alimente par injection

Publications (2)

Publication Number Publication Date
EP0692624A1 EP0692624A1 (de) 1996-01-17
EP0692624B1 true EP0692624B1 (de) 1998-02-04

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EP19950401647 Expired - Lifetime EP0692624B1 (de) 1994-07-12 1995-07-07 Doppelstrahl-Kraftstoffeinspritzdüse mit parallelen Kernen und Luftspalten für Einspritzbrennkraftmaschinen

Country Status (4)

Country Link
EP (1) EP0692624B1 (de)
DE (1) DE69501571T2 (de)
ES (1) ES2112023T3 (de)
FR (1) FR2722538B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948238A1 (de) * 1999-10-07 2001-04-19 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10034446A1 (de) * 2000-07-15 2002-01-24 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10041024A1 (de) * 2000-08-22 2002-03-14 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3344229A1 (de) * 1983-12-07 1985-06-20 Pierburg Gmbh & Co Kg, 4040 Neuss Elektromagnetisches brennstoffeinspritzventil
US4699323A (en) * 1986-04-24 1987-10-13 General Motors Corporation Dual spray cone electromagnetic fuel injector
JPS63201366A (ja) * 1987-02-18 1988-08-19 Hitachi Ltd 電磁作動式燃料噴射装置
JP2537263B2 (ja) * 1988-04-12 1996-09-25 本田技研工業株式会社 燃料噴射式エンジンの吸気装置
DE4115477C2 (de) * 1990-05-17 2003-02-06 Avl Verbrennungskraft Messtech Einspritzdüse für eine Brennkraftmaschine

Also Published As

Publication number Publication date
FR2722538A1 (fr) 1996-01-19
EP0692624A1 (de) 1996-01-17
DE69501571T2 (de) 1998-07-02
FR2722538B1 (fr) 1996-09-20
ES2112023T3 (es) 1998-03-16
DE69501571D1 (de) 1998-03-12

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