EP1865195B1 - Dispositif destiné à l'injection de carburant - Google Patents

Dispositif destiné à l'injection de carburant Download PDF

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Publication number
EP1865195B1
EP1865195B1 EP07106972A EP07106972A EP1865195B1 EP 1865195 B1 EP1865195 B1 EP 1865195B1 EP 07106972 A EP07106972 A EP 07106972A EP 07106972 A EP07106972 A EP 07106972A EP 1865195 B1 EP1865195 B1 EP 1865195B1
Authority
EP
European Patent Office
Prior art keywords
actuator
housing part
upper housing
valve member
control valve
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
EP07106972A
Other languages
German (de)
English (en)
Other versions
EP1865195A1 (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 EP1865195A1 publication Critical patent/EP1865195A1/fr
Application granted granted Critical
Publication of EP1865195B1 publication Critical patent/EP1865195B1/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
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
    • 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
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • 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 relates to a device for injecting fuel into a combustion chamber of an internal combustion engine according to the preamble of claim 1.
  • the fuel injector generally comprises a control valve, which is designed as a solenoid valve or is actuated with a piezoelectric actuator.
  • Fuel injectors operated with a piezo actuator distinguish between inverse and non-inverse operated injectors. With inversely operated injectors fuel is injected into the combustion chamber, as long as the piezoelectric actuator is not energized. To stop the injection process, the piezoelectric actuator is energized again and expands with it. In non-inversely controlled fuel injectors, the injection process is started when the actuator is energized.
  • the control valve In non-inversely controlled fuel injectors, which are operated with a piezoelectric actuator, the control valve is generally designed so that this opens when the piezoelectric actuator is energized and expands.
  • the piezoelectric actuator acts either directly or hydraulically translated to the valve member of the control valve. The hydraulic ratio is necessary to achieve an additional stroke in short-built actuators to open the control valve far enough.
  • a directly controlled fuel injector with piezoelectric actuator is for example off DE-A 103 37 875 known.
  • a device for injecting fuel into a combustion chamber of an internal combustion engine in which the control valve for driving an injection valve member is driven by a piezoelectric actuator.
  • the piezoelectric actuator is enclosed by a housing part and supported against the housing part.
  • the control valve has a valve member which is connected to the housing part.
  • the housing part, on which the piezoelectric actuator is supported, is fixed by means of an electromagnetic fastening element within a cavity of an injector housing.
  • a control valve for actuating an injection valve member is operated with an actuator which expands when power is supplied.
  • the actuator When the actuator is energized, the control valve is opened and closed when the actuator is not energized.
  • the actuator is enclosed by an upper housing part, which is axially displaceable relative to the injector housing and which is connected to a valve member of the control valve.
  • the upper housing part is mounted with bolts on the valve member. The bolts are passed through a plate which is fixedly connected to the injector housing and on which the actuator is supported. By the bolts, with which the upper housing part is connected to the valve member, the valve member is moved in the direction of the actuator, as soon as it expands.
  • the closing element connected to the valve member is lifted from its seat and releases a connection from a control chamber to a fuel return.
  • the piezoelectric actuator is energized to start the injection process and thereby expands.
  • the upper housing part which is axially displaceable in the injector is displaced upwards.
  • the valve member connected to the upper housing part opens the control valve by lifting a closing element out of its seat.
  • the upper housing part is enclosed in a preferred embodiment of a cover which is connected to the injector.
  • a cover is a plastic or metal cap, which is connected to the injector.
  • the connection of the cover with the injector can be done, for example, that on the cover a bead is provided, which is screwed with a clamping nut on the injector.
  • a membrane is preferably received, by which the actuator is sealed against fuel.
  • the membrane is designed so that it does not hinder the opening and closing movement of the valve member.
  • the membrane is preferably fluid-tightly connected both to the housing and to the valve member.
  • the diaphragm is received between an upper portion and a lower portion of the valve member.
  • the membrane may be made of a resilient material.
  • the opening and closing movement of the valve member is then assisted by the spring force of the diaphragm.
  • a shim is preferably provided between a closing element holder on the valve member. The stroke is set by the thickness of the shim.
  • the actuator with a top bracket is positively secured to the upper housing part.
  • the movement of the actuator is transmitted directly to the upper housing part.
  • the upper holder of the actuator is not connected to the upper housing part and between the upper holder and the upper housing part, a gap is formed. This gap forms a forward stroke, by which an optionally occurring lifting error can be compensated.
  • the spring element In order to achieve a return movement of the closing element into its seat when the upper holder is not connected to the upper housing part, in this case between the upper housing part and the cover a spring element regardingnommnen, which is supported on the one hand on the upper housing part and on the other hand on the cover ,
  • the spring element surrounds the upper housing part and is supported on a rib on the upper housing part.
  • the spring element is for example designed as a helical spring compression spring.
  • a plate spring or a leaf spring can be used.
  • Advantage of the use of a plate spring or a leaf spring is that the space between the upper housing part and the cover kept small can be. This is also the case when the spring element encloses the upper housing part.
  • the upper housing part is preferably made of Invar.
  • Invar has a coefficient of thermal expansion, which corresponds approximately to that of a piezoelectric actuator.
  • FIG. 1 shows a control valve of an inventively designed fuel injector in a first embodiment.
  • An inventively designed device for injecting fuel into a combustion chamber of an internal combustion engine comprises a control valve 1, which is actuated by an actuator 2, which expands when power is supplied.
  • the actuator 2 is a piezoelectric actuator.
  • the actuator 2 is clamped between an upper holder 3 and a lower holder 4.
  • the required bias of the actuator 2 is achieved by a spring element 5.
  • the spring element 5 is in the embodiment shown here designed as a tension spring tube spring which surrounds the actuator 2 and is connected to the upper bracket 3 and the lower bracket 4.
  • the upper bracket 3 is in the in FIG. 1 embodiment shown positively connected to an upper housing part 6.
  • the positive connection takes place in the embodiment shown here by welding. In addition to the positive connection by welding, but it would also be conceivable that the upper bracket is connected by gluing or soldering or by a non-positive connection with the upper housing part 6. Suitable frictional connections are, for example, press-fitting or screwing.
  • the lower holder 4 is connected to a plate 7, which is dimensionally stable connected to the injector 8.
  • the lower bracket 4 is fixed to the plate 7 by a positive connection.
  • openings 9 are formed, are guided by the bolts 10 which are connected to the upper housing part 6.
  • the bolts 10 are connected to an upper portion 11 of a valve member 12.
  • the upper portion 11 of the valve member 12 is designed in the form of a valve pin an armature group of a magnet assembly.
  • the design of the upper portion 11 in the form of an armature of a solenoid valve assembly also makes it possible to easily connect the bolts 10, which are connected to the upper housing part 6, with the upper portion 11 of the valve member 12.
  • the upper portion 11 of the valve member 12 via threaded rods or pins (not according to the invention) are connected to the upper housing part 6.
  • the upper housing part 6 is enclosed by a cover 13.
  • the cover 13 is provided in the embodiment shown here with a bead 14. With a clamping nut 15 which engages over the bead 14, the cover 13 is connected to the injector 8.
  • the membrane 16 is liquid-tightly connected to the plate 7.
  • the connection is made for example via a weld.
  • the membrane 16 is performed under the upper portion of the valve member 12.
  • the membrane 16 may also be provided with an opening which surrounds the valve member 12. Around Opening the membrane 16 is liquid-tightly connected to the valve member 12.
  • the connection is then preferably via a weld.
  • a lower portion 17 of the valve member 12 connects.
  • the lower section 17 comprises a dial 18, a closing element receptacle 19 and a closing element 20.
  • the closing element 20 is of spherical design here.
  • the closing element 20 may also be formed, for example, conical or in the form of a flat seat.
  • the closing element 20 When the control valve 1 is closed, the closing element 20 is in a seat 21.
  • the control valve 1 closes or releases a drainage channel 22 with an outlet throttle 23 received therein.
  • the outlet channel 22 connects a control chamber 24 with a fuel return 25.
  • the control chamber 24 is bounded on one side by an upper end face 26 of a control piston 27.
  • the control chamber 24 is connected to a fuel inlet 29.
  • the fuel inlet 29 is connected, for example, to a high-pressure accumulator, not shown here, from which fuel under system pressure flows into the fuel injector. From the fuel inlet 29 branches off a high pressure passage 30 which is connected to a nozzle chamber. From the nozzle chamber, when the injection valve member is open, the fuel flows into the combustion chamber of the internal combustion engine.
  • the outlet channel 22 with the outlet throttle 23, the inlet throttle 28, the control chamber 24 and a guide 31 for the control piston 27 are formed in a valve piece 32. Furthermore, the seat 21 of the control valve 1 is formed in the valve piece.
  • the actuation of the actuator 2 via an electrical contact 33 is guided here by the plate 7 so that it is stationary and is not moved with the upper housing part 6.
  • the actuator 2 is energized. As a result, the actuator 2 expands. Since the lower holder 4 is received with the plate 7 stationary in the injector 8, the actuator 2 acts on the upper bracket 3 and thus on the upper housing part 6. This is raised. This also raises the upper portion 11 of the valve member 12 which is connected to the upper housing part 6 at. As a result, the closing element 20 also lifts out of its seat and releases the connection from the outlet channel 22 into the fuel return 25. Fuel flows from the control chamber 24 into the fuel return 25. As a result, the pressure in the control chamber 24 decreases. The Compressive force acting on the upper end surface 26 of the control piston 27, thereby becomes smaller. The control piston is no longer force-balanced and moves into the control chamber 24.
  • control chamber This increases the volume of a control chamber, not shown here, which is bounded by the end of the control piston 24, which is opposite to the upper end surface 26.
  • the second control chamber is further limited by an injection valve member. Due to the decreasing pressure, a lower pressure force acts on the injection valve member, so that this is lifted from its seat. The injection process begins.
  • FIG. 2 shows a section of a inventively designed fuel injector in a second embodiment.
  • the upper bracket 3 of the actuator 2 is not connected to the upper housing part 6.
  • the upper housing part 6 can be raised by the actuator 2 and the upper bracket 3, a shoulder 40 is formed on the upper bracket 3.
  • the shoulder 40 cooperates with a second shoulder 41 on the upper housing part 6.
  • the actuator 2 is energized and expands, the upper housing part 3 rises in the direction of the upper housing part 6.
  • the shoulder 40 of the upper bracket 3 is in contact with the second shoulder 41 of the upper housing part 6, the upper housing part 6 is raised.
  • a gap 42 is formed between the shoulder 40 of the upper bracket 3 and the second shoulder 41 of the upper housing part 6.
  • the gap 42 serves as a forward stroke, with which an optionally occurring lifting error can be compensated. This is the case, for example, if the piezoelectric actuator, if it is not energized, contracts further if the upper housing part can be moved in the direction of the control valve 1.
  • the upper housing part 6 is enclosed by a cover 13.
  • the cover 13 is fixedly connected to the injector 8.
  • the actuator 2 contracts the upper housing part 6 to move down again so that the control valve 1 is closed, encloses in the embodiment shown here, a spring element 43, the upper housing part 6.
  • the spring element 43 is in the embodiment shown here designed as a helical spring compression spring. So that the upper housing part 6 is moved in not energized actuator 2 in the direction of the control valve 1, the spring element 43 is supported with one side against the cover 13 and with the other side against an extension 44 on the upper housing part.
  • the spring element 43 is tensioned.
  • the spring force of the spring element 43 acts on the extension 44 of the movable upper housing part 6 and pushes it down.
  • the control valve 1 is closed by the closing element 20 is placed in its seat 21.
  • the cover 13 in the in FIG. 2 illustrated embodiment is fixedly connected to the injector, so that they can not move.
  • the spring element 43 is already biased even when not energized and thus not extended actuator 2.
  • the selected bias voltage is dependent on the force that is to act on the extension 44 on the upper housing part 6.

Claims (10)

  1. Dispositif pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, dans lequel une soupape de commande (1) destinée à commander un organe de soupape d'injection est actionnée par un actionneur (2) qui s'étire lorsqu'il est alimenté en courant, la soupape de commande (1) étant ouverte lorsque l'actionneur (2) est alimenté en courant, et étant fermée lorsque l'actionneur (2) n'est pas alimenté en courant, et l'actionneur (2) étant entouré par une partie de boîtier supérieure (6), et la partie de boîtier supérieure (6) étant déplaçable axialement par rapport à un boîtier d'injecteur (8) et étant connectée à un organe de soupape (12) de la soupape de commande (1), caractérisé en ce que la partie de boîtier supérieure (6) est montée sur l'organe de soupape (12) avec des boulons (10), les boulons (10) étant guidés à travers des orifices (9) dans une plaque (7), qui est connectée fixement au boîtier d'injecteur (8) et sur laquelle s'appuie l'actionneur (2).
  2. Dispositif selon la revendication 1, caractérisé en ce que l'actionneur (2) est un actionneur piézoélectrique.
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que la partie de boîtier supérieure (6) est entourée par un recouvrement (13) qui est connecté au boîtier d'injecteur (8).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'une membrane (16) est logée entre l'actionneur (2) et un élément de fermeture (20) connecté à l'organe de soupape (12), laquelle réalise l'étanchéité de l'actionneur (2) vis-à-vis du carburant.
  5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'actionneur (2) est fixé par engagement par coopération de forme avec une fixation supérieure (3) sur la partie de boîtier supérieure (6).
  6. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la fixation supérieure (3) de l'actionneur (2) n'est pas connectée à la partie de boîtier supérieure (6) et en ce qu'une fente (42) est réalisée entre la fixation supérieure (3) et la partie de boîtier supérieure (6).
  7. Dispositif selon la revendication 6, caractérisé en ce qu'un élément de ressort (43) est reçu entre la partie de boîtier supérieure (6) et le recouvrement (13), et s'appuie d'une part contre la partie de boîtier supérieure (6) et d'autre part contre le recouvrement (13).
  8. Dispositif selon la revendication 7, caractérisé en ce que l'élément de ressort (43) entoure la partie de boîtier supérieure (6)et s'appuie d'une part sur un élargissement (44) sur la partie de boîtier supérieure (6) et d'autre part contre le recouvrement (13).
  9. Dispositif selon l'une quelconque des revendications 1 à 8, caractérisé en ce que l'organe de soupape (12) comprend un disque d'ajustement (18) avec lequel la course est ajustée.
  10. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la partie de boîtier supérieure (6) est fabriquée en Invar.
EP07106972A 2006-06-07 2007-04-26 Dispositif destiné à l'injection de carburant Not-in-force EP1865195B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006026397A DE102006026397A1 (de) 2006-06-07 2006-06-07 Vorrichtung zum Einspritzen von Kraftstoff

Publications (2)

Publication Number Publication Date
EP1865195A1 EP1865195A1 (fr) 2007-12-12
EP1865195B1 true EP1865195B1 (fr) 2009-08-19

Family

ID=38474043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07106972A Not-in-force EP1865195B1 (fr) 2006-06-07 2007-04-26 Dispositif destiné à l'injection de carburant

Country Status (3)

Country Link
EP (1) EP1865195B1 (fr)
AT (1) ATE440217T1 (fr)
DE (2) DE102006026397A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017208269A1 (de) * 2017-05-17 2018-11-22 Robert Bosch Gmbh Förderaggregat für eine Brennstoffzellenanordnung zum Fördern und Steuern von einem gasförmigen Medium

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519191C2 (de) * 1995-05-24 1997-04-10 Siemens Ag Einspritzventil
DE19702066C2 (de) * 1997-01-22 1998-10-29 Daimler Benz Ag Piezoelektrischer Injektor für Kraftstoffeinspritzanlagen von Brennkraftmaschinen
IT1320475B1 (it) * 2000-06-30 2003-11-26 Fiat Ricerche Attuatore piezoelettrico autocompensato per una valvola di controllo.
JP4161635B2 (ja) * 2002-08-19 2008-10-08 株式会社デンソー 燃料噴射制御装置
DE20220800U1 (de) * 2002-10-24 2004-04-08 Vermes Technik Gmbh & Co. Kg Piezoelektrisches Aktorsystem
DE102004057464A1 (de) * 2004-11-29 2006-06-01 Robert Bosch Gmbh Piezoaktor zur Betätigung eines mechanischen Bauteils

Also Published As

Publication number Publication date
DE102006026397A1 (de) 2007-12-13
DE502007001327D1 (de) 2009-10-01
EP1865195A1 (fr) 2007-12-12
ATE440217T1 (de) 2009-09-15

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