EP1431571B1 - Soupape d'injection de carburant à bougie integrée - Google Patents

Soupape d'injection de carburant à bougie integrée Download PDF

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Publication number
EP1431571B1
EP1431571B1 EP04000412A EP04000412A EP1431571B1 EP 1431571 B1 EP1431571 B1 EP 1431571B1 EP 04000412 A EP04000412 A EP 04000412A EP 04000412 A EP04000412 A EP 04000412A EP 1431571 B1 EP1431571 B1 EP 1431571B1
Authority
EP
European Patent Office
Prior art keywords
valve body
valve
face
spark plug
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.)
Expired - Lifetime
Application number
EP04000412A
Other languages
German (de)
English (en)
Other versions
EP1431571A2 (fr
EP1431571A3 (fr
Inventor
Franz Rieger
Gernot Wuerfel
Stefan Kampmann
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 EP1431571A2 publication Critical patent/EP1431571A2/fr
Publication of EP1431571A3 publication Critical patent/EP1431571A3/fr
Application granted granted Critical
Publication of EP1431571B1 publication Critical patent/EP1431571B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/06—Fuel-injectors combined or associated with other devices the devices being sparking plugs
    • 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
    • F02M51/0671—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 having an elongated 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • F02M61/163—Means being injection-valves with helically or spirally shaped grooves

Definitions

  • the invention relates to a fuel injection valve with integrated spark plug according to the preamble of the main claim.
  • the fuel injector with integrated spark plug is used for direct injection of fuel into the combustion chamber of an internal combustion engine and for igniting the fuel injected into the combustion chamber.
  • the compact integration of a fuel injection valve with a spark plug installation space can be saved on the cylinder head of the engine.
  • the known fuel injection valve with integrated spark plug has a valve body which, together with an actuatable by means of a valve needle valve closing body forms a sealing seat, which is followed by an opening on one of the combustion chamber end face of the valve body ejection opening.
  • the valve body is high-voltage resistant isolated by a ceramic insulating body of a screwed into the cylinder head of the internal combustion engine housing body.
  • a ground electrode On the housing body is a ground electrode to form a counter potential to the high voltage applied valve body.
  • the fuel injection valve with integrated spark plug according to the invention with the characterizing features of the main claim has the advantage that the position of the flashover with respect to the position of the injection opening is reproducible and clearly defined. Thus, a safe ignition of the sprayed fuel jet is guaranteed.
  • the position of the flashover and thus the ignition point can be placed in the area of the sprayed fuel jet with the least cyclic beam fluctuations.
  • the timing of the ignition of the fuel jet therefore has extremely small variations from injection cycle to injection cycle.
  • the positioning of the flashover or the ignition point in the vicinity of the injection orifice coagulation and coking of the injection orifice is counteracted and thus counteracted by a consequent change in the beam geometry.
  • the edge for determining the position of the flashover can be provided either on the end face of the valve body or on the ignition electrodes.
  • the edge may be formed on the end face of the valve body by an elevation or depression. It is advantageous if the valve body has at the elevation a rounded edge region in order to direct the air flow targeted to the ignition point. If the firing point defining edge is formed on the end face of the valve body, as ignition electrode can be a simple find the end face of the valve body spanning wire use, which is a particularly cost-effective design.
  • Figs. 1 and 2 and Figs. 4 to 7 illustrate the understanding of the invention but are not exemplary embodiments of the invention.
  • a fuel injection valve with integrated spark plug for directly injecting fuel into a combustion chamber of a mixture-compressed spark-ignited internal combustion engine and for igniting the fuel injected into the combustion chamber is shown in accordance with one to facilitate the understanding of the invention.
  • the generally provided with the reference numeral 1 fuel injector with integrated spark plug has a first housing body 2, which is screwed by means of a thread 3 in a receiving bore of a cylinder head, not shown in Fig. 1, and a second housing body 4 and a third housing body 5.
  • the metallic housing formed by the housing body 3, 4, 5 surrounds an insulating body 6, which in turn at least partially radially outside a valve body 7, a swirl insert 14 and extending inside the swirl insert 14 via the inlet end 8 of the valve body 7 surrounds.
  • With the valve needle 9 is a discharge side conical valve closing body 10 is connected, which forms a sealing seat together with an inside conical valve seat surface at the discharge-side end 11 of the valve body 7.
  • valve needle 9 and the valve closing body 10 are integrally formed.
  • the valve-closing body 10 When lifting the valve-closing body 10 from the valve seat surface of the valve body 7, the valve-closing body 10 releases an outlet opening 12 formed in the valve body 7, so that a conical fuel jet 13 is hosed down.
  • a swirl groove 14a is provided, wherein a plurality of swirl grooves 14a may be provided.
  • First ignition electrodes 70a for generating a spark are provided on the first housing body 2.
  • the ignition electrodes 70a lead 'while ground potential, while the valve body 7 can be acted upon by a high voltage potential.
  • the lengths of the ignition electrodes 70a are the beam angle and the beam shape of the Fuel jet 13 adapt. In this case, the ignition electrodes 70a can either dip into the fuel jet 13, or the fuel jet 13 can be guided past the ignition electrodes 70a at a small distance, without the ignition electrodes 70a being wetted by the fuel. It is also conceivable to immerse the ignition electrodes 70a in gaps of individual beams generated by the outlet opening 12 or a plurality of spray-discharge openings.
  • the valve body 7 is preferably formed in two parts from a first part body 7a and a second part body 7b, which are welded together at a weld 17.
  • the valve needle 9 is divided in the example in a first metallic, discharge-side guide portion 9a, a second metallic inlet-side guide portion 9b and a sleeve-shaped in the example, ceramic insulation portion 9c.
  • the first guide portion 9a is guided in the swirl insert 14.
  • the guide is provided by the cylindrical lateral surface 18 of the valve closing body 10 formed integrally with the first guide section 9a.
  • a second guide of the valve needle 9 takes place by means of the second guide section 9b in the insulation body 6.
  • the lateral surface 19 of the second guide section 9b acts with a bore 20 in the insulation body 6 together.
  • the guide portions 9a and 9b serving as the guide are formed as metallic components and can be manufactured with the manufacturing accuracy required for the guide.
  • the insulating section 9c can be made as a ceramic part. Since the insulating section 9c does not serve to guide the valve needle 9, only small demands are placed on the dimensional accuracy and the surface roughness. A revision of the ceramic part is therefore not required.
  • the guide sections 9a and 9b are not only positively connected to the insulation section 9c but also positively connected.
  • the guide portions 9a and 9b each have a pin 21 and 22 respectively, which is inserted into a bore 23 formed as a recess of the insulating portion 9c.
  • the connection between the pins 21 and 22 of the guide portions 9a and 9b is made by a frictional engagement, by gluing or shrinking.
  • the insulation section 9c is preferably sleeve-shaped.
  • the saved over a solid body material results in a weight saving, which leads to shorter switching times of the fuel injection valve 1.
  • the second guide portion 9b is connected to an armature 24, which cooperates with a solenoid coil 25 for the electromagnetic actuation of the valve closing body 10.
  • a sleeve-shaped core 28 at least partially penetrates the magnet coil 25 and is separated from the armature 24 by a gap, not visible from the figure, in the closed position of the fuel injection valve 1 spaced.
  • the magnetic flux circuit is closed by the ferromagnetic components 29 and 30.
  • the fuel flows through a fuel inlet port 31, which is connectable via a thread 32 with a fuel distributor, not shown, in the fuel injection valve with integrated spark plug 1.
  • the fuel first flows through a fuel filter 33 and then flows into a longitudinal bore 34 of the core 28.
  • adjusting sleeve 36 which is screwed into the longitudinal bore 34 of the core 28.
  • the adjusting sleeve 36 serves to adjust the bias of a return spring 37, which acts on the armature 24 in the closing direction.
  • the fuel continues to flow through a longitudinal bore 39 in the second guide portion 9b of the valve needle 9 and enters at an axial recess 40 in a cavity 41 of the insulating body 6 a.
  • the fuel flows from there into a longitudinal bore 42 of the valve body 7, in which also the valve needle 9 extends, and finally reaches the already described twist groove 14a on the outer circumference of the swirl insert 14th
  • the ignition electrodes 70a connected to the housing body 2 carry ground potential, while the valve body 7 can be subjected to a high-voltage potential for generating ignition sparks.
  • a high voltage cable 50 To supply the high voltage is a high voltage cable 50, which is inserted through a lateral, pocket-like recess 51 in the insulation body 6.
  • the stripped end 52 of the high-voltage cable 50 is soldered or welded to a soldering or welding point 53 with a contact clip 54.
  • the contact clip 54 grips the valve body 7 and establishes a secure electrically conductive contact between the stripped end 52 of the high voltage cable 50 and the valve body 7.
  • the insulating body 6 has a radial bore 55, via which a soldering or Welding tool to the soldering or welding point 53 can be performed.
  • the pocket-like recess 51 is filled with an electrically insulating potting compound 56.
  • an integrated in the high voltage cable 50 Abbrandwiderstand 57 can be poured into the potting compound 56 with.
  • a high-voltage resistant film 58 can be inserted into the pocket-like recess 51 of the insulating body 6 and also encapsulated with the sealing compound 56.
  • potting compound 56 is suitable for. Silicone.
  • the insulating body 6 and the valve body 7 may be screwed together at a thread 60. Furthermore, the insulating body 6 may be screwed to the housing body 2 at a further thread 61 with each other. Preferably, threads 60 and 61 are secured with a suitable adhesive.
  • the insulating body 6 can be produced inexpensively as a sprue ceramic part.
  • the valve body 7 and the insulating body 6 can be screwed and glued with a mounting mandrel to compensate for misalignment in the leadership of the valve needle 9.
  • the spatially close arrangement of Abbrandwidersrands 57 to the ignition electrodes 70a reduces the burnup of the ignition electrodes 7a and allows despite an increased electrical capacity a full metal sheath of the fuel injection valve with integrated spark plug 1 through the metallic housing body 2, 4 and 5.
  • FIG. 2 shows an enlarged representation of the discharge-side end region of the fuel injection valve with integrated spark plug 1 shown in FIG. 1.
  • the ignition electrodes 70a can be seen particularly well in this illustration.
  • the fuel injection valve with integrated spark plug 1 is screwed in the illustration of FIG. 2 in a cylinder head 71 of an internal combustion engine, so that the ignition electrodes 70a protrude into a combustion chamber 72 of the internal combustion engine.
  • the projections 78 of the housing body 2 are arranged circumferentially offset from one another on the housing body 2, wherein between the individual projections 78 relatively large gaps are formed to an unimpeded influx of combustion air to the outlet of the outlet opening 12 to allow the combustion chamber 72 facing end face 73 of the valve body 7.
  • an ignition electrode 70 a arranged and at the associated projection 78 z. B. attached by welding or screwing.
  • the ignition electrodes 70a are each inclined relative to the plane of the end face 73 of the valve body 7 by a predetermined inclination angle ⁇ in the direction of the end face 73 of the valve body 7.
  • the end face 73 of the valve body 7 is in each case opposite an edge 74 of the pin-shaped ignition electrodes 70a.
  • the position of the edges 74 defines the location of the smallest distance between the ignition electrodes 70a and the end face 73 of the valve body 7 and thus determines the firing point. Due to the edge-shaped formation results at this point an increased electric field strength, which causes the plasma discharge of the spark.
  • the firing point defined by the edges 74 is therefore reproducible from injection cycle to injection cycle.
  • the most favorable position of the ignition point can be optimized by experiments and is in the range of the so-called beam root of ejected from the outlet opening 12 fuel jet 13.
  • the position of the edges 74 at the opening angle ⁇ of the Outlet opening 12 already sprayed fuel jet 13 are adapted.
  • the distance of the edges 74 of the Zündelelctroden 70a of the end face 73 of the valve body 7 can be adjusted by bending a bend 75 of the projections 78 manufacturing technology exactly.
  • Fig. 3 shows a section through the discharge-side end portion of a fuel injection valve with integrated spark plug 1 according to an embodiment of the invention. Already described elements are provided with matching reference numerals.
  • the edge for determining the position of the flashover and thus the ignition point is not formed on the ignition electrode 70, but on the end face 73 of the valve body 7.
  • the end face 73 of the valve body 7 on an increase 80 with a circumferential edge 81.
  • an increased electric field strength which triggers the plasma discharge of the ignition spark, is produced at the edge 81.
  • the position of the ignition point can be exactly determined with respect to the position of the outlet opening 12 by suitable dimensioning of the diameter of the elevation 80.
  • the ground potential leading ignition electrode 70 b can be formed in this embodiment by a simple wire which is clamped between a first projection 78 a of the housing body 2 and a second projection 78 b of the housing body 2 and can be fixed by welds 82.
  • the wire-shaped ignition electrode 70b results in a configuration with particularly low Production expense.
  • an increase 80 may be provided on the end face 73 of the valve body 7, a recess at whose boundary also an edge for selectively increasing the electric field strength is formed.
  • Fig. 4 shows a section through the discharge-side end portion of an example of a fuel injection valve with integrated spark plug 1. Again, already described elements are provided with matching reference numerals.
  • the ignition electrode 70c has an annular shape and has an opening 90 for the fuel jet 13 sprayed off from the outlet opening 12.
  • the opening 90 of the annular ignition electrode 70c is preferably formed with a conical inner surface and expands in the spray direction 91 of the fuel jet 13.
  • the opening angle ⁇ 'of the opening 90 of the annular ignition electrode 70c is preferably adapted to the opening angle ⁇ of the fuel jet 13.
  • the opening angle ⁇ 'of the opening 90 coincides with the opening angle ⁇ of the fuel jet 13.
  • the opening 90 has an acute-angled edge 92, which defines the ignition point in this example.
  • the annular ignition electrode 70c is attached to the protrusions 78 of the case body 2 via connecting pins 93.
  • the projections 78 are distributed radially circumferentially on the housing body 2. For example, 3 or 4 such projections 78 are provided.
  • Each projection 78 is associated with a connecting pin 93.
  • the projections 78 and the connecting pins 93 are made relatively narrow, so that between the projections 78 and the connecting pins 93 remain relatively large gaps through which the combustion air can flow unhindered to the mouth of the outlet opening 12 and to the specified by the peripheral edge 92 Zündstelle , An unrestricted influx of combustion air is essential for a safe ignition of the fuel jet 13 and a low sooting and coking at the mouth of the outlet opening 12.
  • Fig. 5 shows a section through the discharge-side end of a fuel injection valve with integrated spark plug 1 according to another example.
  • already described elements are also provided here with matching reference numerals.
  • the difference from the example already described with reference to FIG. 4 consists essentially in that the annular ignition electrode 70c has a chamfered portion 96, to which the connecting pins 93 are aligned.
  • FIG. 6 shows a section through the discharge-side end of a fuel injection valve with integrated spark plug 1 according to another example.
  • the example shown in FIG. 6 represents a combination of the examples shown in FIGS. 3 and 4.
  • a ring electrode 70 c is provided whose opening 90 has an edge 92 at the end opposite the end face 73 of the valve body 7.
  • the end face 73 of the valve body 7 has an elevation 80 with a circumferential edge 81.
  • the peripheral edge 81 of the elevation 80 is located near the circumferential edge 92 of the annular ignition electrode 70c.
  • the ignition point is located between the two circumferential edges 92 and 81, since there the valve body 7 and the ignition electrode 70c on the one hand have the smallest distance from each other and on the other hand at this point due to the edges 81 and 92, a particularly high electric field strength occurs.
  • Fig. 7 shows a section through the discharge-side end portion of a fuel injection valve with integrated spark plug 1 according to another example.
  • elements already described are provided with matching reference numerals.
  • the example shown in FIG. 7 largely corresponds to the example already described with reference to FIG. 6 with the difference that the flank region 97 of the elevation 80 of the end face 73 of the valve body 7 is concavely rounded.
  • the laterally flowing combustion air is guided to the fuel jet 13 and the firing point defined by the peripheral edges 81 and 92. It therefore results in a particularly good inlet geometry for the combustion air, so that a reliable ignition of the fuel jet 13 and a low-emission combustion are ensured.
  • a fouling and coking of the outlet of the outlet opening 12 is counteracted.
  • the shape and design of the ignition electrodes 70a-70c of the examples described above avoids unintentional glow ignition. Furthermore, the inventively designed ignition electrodes 70b have an increased mechanical stability and a prolonged life. Due to the geometry of the ignition electrodes 70a to 70c and of the valve body 7, a constant fuel-air mixture with lambda between 0.6 and 1.0 is achieved at the ignition point. The ignition point is in the range of the lowest cyclical fluctuations of the Fuel jet. Due to the sparks possibly deposited on the end face 73 of the valve body 7 impurities are burned according to a self-cleaning effect.

Claims (3)

  1. Injecteur de carburant à bougie intégrée (1), pour l'injection directe de carburant dans une chambre de combustion (72) d'un moteur à combustion interne et pour l'allumage du carburant qui y est injecté, dans lequel
    - un corps d'injecteur (7), forme avec un obturateur d'injecteur (10), un siège d'étanchéité auquel se raccorde au moins une ouverture de sortie (12) débouchant sur une face frontale (73) du corps d'injecteur située du côté de la chambre de combustion (72),
    - sur un corps de boîtier (2) isolé du corps d'injecteur (7) est prévue au moins une électrode d'allumage (70a) pour créer un arc entre elle et le corps d'injecteur (7),
    - l'électrode d'allumage (70a) et le corps d'injecteur (7) sont conformés de manière que l'arc s'établit entre l'électrode d'allumage (70a) et la face frontale (73) du corps d'injecteur (7) située du côté de la chambre de combustion (72),
    - la face frontale (73) du corps d'injecteur (7) située du côté de la chambre de combustion (72) et/ou l'électrode d'allumage (70a) présente(nt) à proximité de l'ouverture de sortie (12) un bord (81) pour fixer de manière reproductible la position de l'arc sur la face frontale (73) du corps d'injecteur (7), par rapport à l'ouverture de sortie (12),
    caractérisé en ce que
    la face frontale (73) du corps d'injecteur (7) présente à une distance prédéfinie de l'ouverture de sortie (12) une partie en relief (80) ou en creux délimitée par un bord (81) et, sur le corps de boîtier (2) il est prévu au moins deux supports (78a, 78b) en saillie sur la face frontale (73) du corps d'injecteur, et entre lesquels se trouve au moins une électrode d'allumage (70b) en forme de fil.
  2. Injecteur de carburant à bougie intégrée selon la revendication 1,
    caractérisé en ce que
    la face frontale (73) du corps d'injecteur (7) présente une partie en relief (80) avec une zone de flanc (97) de forme arrondie.
  3. Injecteur de carburant à bougie intégrée selon la revendication 1 ou 2,
    caractérisé en ce que
    l'électrode d'allumage (70b) en forme de fil peut être fixée par des cordons de soudure (82) sur les supports (78a, 78b) au nombre de deux au moins.
EP04000412A 1998-06-27 1999-04-01 Soupape d'injection de carburant à bougie integrée Expired - Lifetime EP1431571B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19828849A DE19828849A1 (de) 1998-06-27 1998-06-27 Brennstoffeinspritzventil mit integrierter Zündkerze
DE19828849 1998-06-27
EP99924738A EP1032762B1 (fr) 1998-06-27 1999-04-01 Soupape d'injection de carburant a bougie integree

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP99924738A Division EP1032762B1 (fr) 1998-06-27 1999-04-01 Soupape d'injection de carburant a bougie integree
EP99924738A Division-Into EP1032762B1 (fr) 1998-06-27 1999-04-01 Soupape d'injection de carburant a bougie integree

Publications (3)

Publication Number Publication Date
EP1431571A2 EP1431571A2 (fr) 2004-06-23
EP1431571A3 EP1431571A3 (fr) 2004-08-04
EP1431571B1 true EP1431571B1 (fr) 2006-03-29

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP04000412A Expired - Lifetime EP1431571B1 (fr) 1998-06-27 1999-04-01 Soupape d'injection de carburant à bougie integrée
EP99924738A Expired - Lifetime EP1032762B1 (fr) 1998-06-27 1999-04-01 Soupape d'injection de carburant a bougie integree

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP99924738A Expired - Lifetime EP1032762B1 (fr) 1998-06-27 1999-04-01 Soupape d'injection de carburant a bougie integree

Country Status (6)

Country Link
US (2) US6536405B1 (fr)
EP (2) EP1431571B1 (fr)
JP (1) JP2002519571A (fr)
KR (1) KR20010022302A (fr)
DE (3) DE19828849A1 (fr)
WO (1) WO2000000738A1 (fr)

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EP1431571A2 (fr) 2004-06-23
US20030111042A1 (en) 2003-06-19
EP1032762B1 (fr) 2004-03-31
EP1032762A1 (fr) 2000-09-06
DE59909032D1 (de) 2004-05-06
US6748918B2 (en) 2004-06-15
EP1431571A3 (fr) 2004-08-04
US6536405B1 (en) 2003-03-25
KR20010022302A (ko) 2001-03-15
WO2000000738A1 (fr) 2000-01-06
DE19828849A1 (de) 1999-12-30
DE59913266D1 (de) 2006-05-18
JP2002519571A (ja) 2002-07-02

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