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EP1252433B1 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP1252433B1
EP1252433B1 EP00993183A EP00993183A EP1252433B1 EP 1252433 B1 EP1252433 B1 EP 1252433B1 EP 00993183 A EP00993183 A EP 00993183A EP 00993183 A EP00993183 A EP 00993183A EP 1252433 B1 EP1252433 B1 EP 1252433B1
Authority
EP
European Patent Office
Prior art keywords
control valve
valve element
control
space
pressure
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
EP00993183A
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German (de)
English (en)
Other versions
EP1252433A2 (fr
Inventor
Friedrich Boecking
Wolfgang Stoecklein
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 EP1252433A2 publication Critical patent/EP1252433A2/fr
Application granted granted Critical
Publication of EP1252433B1 publication Critical patent/EP1252433B1/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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • 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
    • 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
    • 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
    • F02M47/025—Hydraulically 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
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to a fuel injection valve for Internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection valve is known from DE 197 32 802 A known.
  • This fuel injection valve is part of a Storage fuel injection system.
  • the fuel injector has an axially displaceable guided injection valve member, is controlled by the at least one injection opening and the having a pressure chamber limiting pressure shoulder.
  • the Pressure chamber becomes pressurized fuel from a High-pressure fuel source supplied by the Injection valve member against a closing force for opening the at least one injection opening can be lifted from a valve seat.
  • Control valve provided by a by a piezoelectric actuator generated actuating force against a restoring force movable Control valve member having the in one with a pressure source
  • the control pressure chamber is controlled by the prevailing pressure that controls the Injection valve member at least indirectly in its closing direction applied.
  • the control valve member is the control pressure chamber connectable with a relief space and the control valve member acts with at least one sealing surface with at least one valve seat together, over which the connection of the control pressure space with the Relief space is controlled.
  • the control valve has two in the Movement direction of the control valve member spaced from each other Valve seats on and the control valve member is between two Closing positions movable, in which there are each with a Sealing surface rests against one of the valve seats and the control pressure chamber is separated from the discharge space.
  • control valve member At between his two Closed positions arranged control valve member is the Control pressure chamber connected to the discharge chamber.
  • the Control valve member is piston-shaped and the two Sealing surfaces are on opposite outer sides of the Control valve member arranged. In this training of Control valve member is a large space for the control valve required.
  • the fuel injection valve according to the invention with the features according to claim 1 has the advantage that the control valve with compact design can be performed.
  • FIG. 1 shows a Storage fuel injection system in schematic Representation
  • Figure 2 shows a fuel injection valve of the Storage fuel injection system in a longitudinal section according to a first embodiment
  • Figure 3 the Fuel injection valve in longitudinal section according to a modified embodiment
  • Figure 4 the Fuel injection valve in longitudinal section according to a second embodiment.
  • FIG. 1 A schematically illustrated in Figure 1 Storage fuel injection system has a high-pressure pump 10 on, by the fuel from a storage tank 12 below High pressure is conveyed into a memory 14.
  • the memory 14 is formed as a so-called rail, from the lines To dissipate fuel injection valves 16 which at a Internal combustion engine are arranged.
  • each Fuel injection valve 16 has a control valve 18, by opening and closing the Fuel injection valve 16 is controlled.
  • the Storage fuel injection system also has a Control device 20, the signals over various Operating parameters of the internal combustion engine are supplied and by depending on the control valves 18 of the Fuel injection valves 16 to open or close be controlled.
  • a fuel injection valve 16 with associated control valve 18 according to a first Embodiment shown.
  • the Fuel injection valve 16 has a valve body 22 in which an injection valve member 24 axially displaceable is guided.
  • the valve body 22 has at its the Combustion chamber of the engine facing end at least one, preferably a plurality of injection openings 26 on.
  • the injection valve member 24 has at its the Combustion chamber facing end an example, for example conical sealing surface 28, which with a in Valve body 22 formed valve seat 30 cooperates, from which discharge the injection openings 26.
  • an injection valve member 24 surrounding annular space 32 formed with a pressure chamber 34 is connected, which in turn connected to the memory 14 is, so that in the pressure chamber 34 of the high-pressure pump 10th generated pressure prevails.
  • the injection valve member 24 has a pressure shoulder 34 arranged in the pressure chamber 34, via the pressure prevailing in the pressure chamber 34 pressure in Opening direction 38 of the injection valve member 24 acting Exercise power on this.
  • On injection valve member 24 engages a biased closing spring 40, through which the Injection valve member 24 opposite to that in the pressure chamber 34 prevailing pressure on this in the opening direction 38th acting force is applied in the closing direction.
  • the Injection valve member 24 By the pressure prevailing in the pressure chamber 34 is the Injection valve member 24 against the force of the closing spring 40th movable in the opening direction 38 and gives the Injection openings 26 free, through the fuel in the Combustion chamber of the internal combustion engine is injected. to End of the injection, the injection valve member 24th in the closing direction with its sealing surface 28 in the Valve seat 30 is pressed against the valve body 22, so that the Injection openings 26 are closed.
  • a closing piston 42 arranged, which is part of the control valve 18.
  • the closing piston 42 is at least approximately coaxial arranged to the injection valve member 24 and in a bore 44 in a housing part 46 of the control valve 18 axially slidably guided.
  • the closing piston 42 defines a hole in the bore 44 Control pressure chamber 48, via a channel 49, in which a Throttle 50 is arranged, connected to the memory 14 is.
  • the bore 44 faces away from the closing piston 42 stepped formed and has a portion 44a with reduced diameter and then this again an enlarged diameter portion 44b.
  • From the side facing away from the control pressure chamber 48 side is in the Sections 44a, b of the bore 44 a nozzle 52 is inserted, essentially a slightly smaller diameter than has the portion 44 a of the bore and with his End portion is arranged in section 44a.
  • the nozzle 52 is at least approximately coaxial with the closing piston 42 arranged.
  • the nozzle 52 has an annular collar 53, whose diameter is slightly smaller than the diameter of the Section 44b of the bore 44 and the section 44b is arranged.
  • the nozzle 52 is located with its annular collar 53rd at the transition between the sections 44a and 44b of Bore 44 formed annular shoulder and is thus in Direction of its longitudinal axis to the control pressure chamber 48 back established.
  • the housing part 46 is followed by a Washer 54, which has a bore 55, whose Diameter larger than the diameter of the nozzle 52 however, smaller than the diameter of the annular collar 53 is.
  • the Washer 54 is between the housing part 46 and a clamped further housing part 56, so that by this the Stutzen 52 via its annular collar 53 in the direction of his Longitudinal axis is also set away from the control pressure chamber 48.
  • a flow channel 58 is formed, which the control pressure chamber 48 limiting the front end of the Stutzens 52 goes out and on the lateral surface of the nozzle 52nd near the end remote from the control pressure chamber 48 end empties.
  • the flow channel 58 has, for example, starting from the front end of the nozzle 52 is an approximately parallel to Longitudinal axis of the nozzle 52 extending portion 58 a and an approximately perpendicular to this extending portion 58b on, which opens on the lateral surface of the nozzle 52.
  • a throttle 59 may be arranged to to limit the flow.
  • the nozzle 52 At its the control pressure chamber 48 remote end region, the nozzle 52 a for example, conical chamfer 60, which as a first valve seat of the control valve 18 is used.
  • the housing part 56 of the control valve 18 has a bore 61, in which the nozzle 52 with its the control pressure chamber 48 remote area protrudes.
  • a Control valve member 62 guided tightly displaceable, as a Hollow piston is formed, in which the nozzle 52nd protrudes.
  • the control valve member 62 has to Washer 54 toward a hole 63, whose Diameter is only slightly larger than the diameter of the through the bore 63 passing through nozzle 52.
  • To the Bore 63 is then in the control valve member 62 a opposite the bore 63 extended pressure space 64th formed in which the flow channel 58 of the nozzle 52nd empties.
  • Control valve member 62 has a bore 65 with a smaller Diameter than the bore 63, which at the the Intermediate disc 54 remote from the front end of the Control valve member 62 opens.
  • the transition from the pressure chamber 64 to the bore 65 extends with an example conical Bevel 66.
  • the bore 63, the pressure chamber 64 and the Bore 65 in the control valve member 62 are at least approximately arranged coaxially with each other.
  • the chamfer 66 serves as first sealing surface of the control valve member 62, with the Bevel 60 on the nozzle 52 as the first valve seat interacts.
  • the bore 65 forms a discharge channel, through which the pressure chamber 64 with the outside of the Control valve member 62 is connected.
  • the control valve member 62 has at its the intermediate disc 54 opposite end portion one opposite to the diameter of the guided in the bore 61 area of Control valve member 62 in the reduced diameter approach 68th up, which ends with an example tapered bevel 69, which is a second Sealing surface on the control valve member 62 forms.
  • an annular shoulder 70 is formed at the control valve member 62 .
  • the bore 61 is as Sack bore formed and between the bottom 71 of the Bore 61 and the annular shoulder 70 of the control valve member 62nd a prestressed return spring 72 is arranged through the control valve member 62 to the washer 54 out is pressed.
  • the bottom 71 of the bore 61 has a at least approximately coaxial with the control valve member 62 arranged recess 73, the edge 74, for example is conically tapered and a second Valve seat forms, with which the second sealing surface forming chamfer 69 on the control valve member 62nd interacts.
  • the control valve member 62 with the Approach 68 is limited in the bore 61 an annular space 75, the connected via a channel 76 with a discharge space is than, for example, the storage tank 12 can serve.
  • the diameters of the first valve seat 60 and the second Valve seat 74, where the control valve member 62 with its first sealing surface 66 and with its second Sealing surface 69 comes to rest, are at least approximately same size.
  • control valve member 62 By the control valve member 62 is in the bore 61 for Washer 54 toward a working space 78 limited.
  • the Bore 61 may be in the region of the annular space 75 and / or in the Area of the working space 78 slightly larger in diameter be compared to the area in which the control valve member 62nd is guided in the bore 61.
  • the working space 78 is over a hydraulic ratio with a piezoelectric actuator 80th connected.
  • the piezo actuator 80 is controlled by the controller 20 is activated and changes depending on one at this applied electrical voltage its length.
  • the Piezoactuator 80 is disposed in a cylinder 81 and causes in its change in length compression or Relaxation of a cylinder 81 arranged Hydraulic volume.
  • the hydraulic transmission is thereby achieved that that influenced by the piezoelectric actuator 80 Hydraulic volume to a diameter in relation to the Piezoaktor 80 reduced piston 82 acts, the at a Length change of the piezoelectric actuator 80 by a ratio the diameter of the piezoactuator 80 to the diameter of the Piston 82 enlarged stroke executes.
  • the piston 82 is at least approximately coaxial with the piezoelectric actuator 80 and arranged in a cylinder 83 corresponding in diameter slidably guided.
  • a Workspace 84 limited, the one in diameter smaller channel 85 in the housing part 56 with the working space 78th connected is.
  • the piezoelectric actuator 80 and the piston 82 can arbitrarily on the circumference of the housing part 56 of the control valve 18th be arranged and with their longitudinal axes approximately perpendicular to Longitudinal axis of the control valve 18 or as in Figure 2 represented as desired to the longitudinal axis of the control valve inclined.
  • the second sealing surface 69 is located on the control valve member 62 then not in contact with the second valve seat 74, so that the bore 65 of the control valve member 62 with the annular space 75th and over this with the serving as a discharge space Storage tank 12 is connected. From the control pressure chamber 48 can in this open position of the control valve 18th Fuel through the flow channel 58, the pressure chamber 64 and serving as a discharge channel bore 65 in the Discharge relief space, whereby the pressure in the Control pressure chamber 48 decreases.
  • the injection valve member 24 may in this case by the on his pressure shoulder 36 acting pressure of the memory 14 against the force of Closing spring 40 and against that of the control pressure chamber 48th prevailing reduced pressure generated force in Opening direction 38 are moved and gives the Injection openings 28 free, so that injected fuel becomes.
  • the pressure in the working space 78 so be set that the control valve 18 in his is kept open position, in this neither with its first sealing surface 66 at the first valve seat 60 at Stub 52 rests still with its second sealing surface 69 on second valve seat 74 on the bottom 71 of the bore 61 abuts and thus the fuel injection valve 16 remains open. It can also be provided that by appropriate Activation of the piezoelectric actuator 80, the control valve member 62 without Motion interruption from its first closed position in its second closed position is moved or vice versa. at the movement of the control valve member 62 is carried out no Reversal of direction of movement, but this is only in one Direction moves.
  • the control valve 18 is only open briefly, so that accordingly the Fuel injector 16 is opened only briefly. This allows, for example, a Pre-fuel injection, at a low Fuel quantity before the actual fuel injection is injected.
  • By appropriate control of the Piezoaktors 78 of the control valve 18 via the Control device 20 may be the time of opening, the Duration of opening and the size of the opening stroke of the Fuel injection valve 16 can be determined.
  • the Fuel injection valve can initially only briefly and / or be opened with a small opening stroke for the Pre-injection, then closed and then for the main injection for a long time and / or with larger opening stroke to be opened. It can also be one certain course of the injection can be achieved in the For example, the fuel injector initially only is opened with a small opening stroke and subsequently opened with a larger opening stroke. It can also be any other course of injection be achieved.
  • the pressure acts on the front end of the control valve member 62 adjacent to the Bore 65 on a same sized ring surface as inside the control valve member 62 adjacent to the bore 65, so that compensate for the resulting pressure forces.
  • a Movement of the control valve member 62 by the piezoelectric actuator 80 generated pressure in the working space 78 thus does not have against the pressure in the control pressure chamber 48 done so that of the Piezoelectric actuator 80 generates only relatively small actuating forces need and the piezoelectric actuator 80 and the hydraulic Translation to be carried out with small dimensions can.
  • the control valve 18 is according to FIG above-explained first embodiment modified embodiment shown, wherein the basic structure of the control valve 18 according to the modified version is the same as the first Embodiment and below only the additional Characteristics are explained.
  • the nozzle 52 is in the bore 63 of the control valve member 62 as close as possible, so that the bore 63 is a sealing area through which the Pressure chamber 64 in the control valve member 62 from the working space 78th is disconnected.
  • the control valve member 62 has in its Bore 63 has a circumferential annular groove 88, which has a or a plurality of approximately radial bores 89 with an in Outer jacket of the control valve member 62 formed annular groove 90 is connected.
  • the groove 91 may instead of in the outer jacket of the Control valve member 62 also in the bore 61 of the Housing part 56 may be formed.
  • About the annular grooves 88 and 90 may also be a filling of the work spaces 78 and 84th the hydraulic transmission of the control valve 18 take place.
  • control valve 18 according to a second Embodiment illustrated, in turn, the basic structure is the same as the first Embodiment, however, the effective directions of the Piezo actuator generated actuating force and the return spring are reversed.
  • the control valve member 162 has the bore 63, through which the nozzle 52 protrudes into the pressure chamber 64, from which the bore 65 discharges.
  • the recess 73 is formed and the control valve member 162 has the projection 68 on.
  • the bore 161 is as Stepped bore formed and faces the washer 54 toward a larger diameter section 161a and toward its bottom 71 a smaller portion 161b Diameter.
  • control valve member 162 is in his outside diameter also formed stepped and has an area 162a with a larger diameter, the in the section 161 a of the bore 161 is arranged and a Area 162b of smaller diameter, in the section 161b of the bore 161 is arranged.
  • a biased return spring 172 arranged through which the Control valve member 162 to the bottom 71 of the bore 161 out is pressed.
  • Due to the larger diameter area 162a of the control valve member 162 is in section 161a of Bore 161 defines a working space 178, which has a Channel 185 with the hydraulic transmission of the piezoelectric actuator 80 is connected.
  • the from the control valve member 162 in the section 161a of the bore 161 limited to the intermediate disc 54 out Room 188 in which the return spring 172 is arranged is via a channel 189 with a discharge space, for example, the storage tank 12, connected.

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

Abstract

L'invention concerne une soupape d'injection de carburant (16) présentant un obturateur (24) qui commande au moins un orifice d'injection (26). Le déplacement de l'obturateur (24) est commandé par une soupape de commande (18) qui présente un obturateur (62). Ce dernier commande la pression régnant dans une chambre de pression de commande (48) et peut être déplacé par une force de positionnement produite par un piézo-actionneur (80) pour commander ainsi l'établissement d'une communication entre la chambre de pression de commande (48) et une chambre de détente (12). La soupape de commande (18) présente deux sièges (60, 74) placés à distance l'un de l'autre dans le sens de déplacement de l'obturateur (62). Lesdits sièges coopèrent avec ce dernier par l'intermédiaire d'une surface d'étanchéité respective (66, 69) placée sur ledit obturateur (62), de sorte que ce dernier présente deux positions de fermeture, dans lesquelles la chambre de pression de commande (48) ne communique pas avec la chambre de détente (12). Lorsque l'obturateur (12) ne se trouve pas dans une de ces deux positions de fermeture, la chambre de pression de commande (48) communique avec la chambre de détente (12). Un déplacement de l'obturateur (62) entre ses deux positions de fermeture permet l'ouverture brève de la soupape d'injection de carburant (16).

Claims (8)

  1. Injecteur de carburant pour moteurs à combustion interne, notamment comme composant d'un système d'injection de carburant à accumulateur, comprenant un organe d'injecteur (24) axialement mobile qui permet de commander au moins une ouverture d'injection (26) et qui présente un épaulement de pression (36) délimitant une chambre de pression (34), du carburant sous pression étant fourni par une source haute pression de carburant (10 ; 14) dans la chambre de pression (34) et permettant de soulever l'organe d'injecteur (24) d'un siège de soupape (30) contre une force de fermeture pour ouvrir l'au moins une ouverture d'injection (26), et comprenant une soupape de commande (18) influençant le mouvement de l'organe d'injecteur (24) et présentant un organe de soupape de commande (62 ; 162) déplaçable contre une force de rappel par une force de réglage générée par un actionneur piézoélectrique (80) et qui commandant la pression régnant dans la chambre de pression de commande (48) reliée à une source de pression (10 ; 14), et sollicitant l'organe d'injecteur (24) du moins indirectement dans sa position de fermeture, la chambre de pression de commande (48) pouvant être reliée à une chambre de décharge (12) par l'intermédiaire de l'organe de soupape de commande (62 ; 162) qui coopère par au moins une surface d'étanchéité (66, 69) avec au moins un siège de soupape (60, 74) permettant de commander la communication de la chambre de pression de commande (48) avec la chambre de décharge (12), la soupape de commande (18) présentant deux sièges de soupape (60, 74) à distance l'un de l'autre dans la direction du mouvement de l'organe de soupape de commande (62 ; 162), qui se déplace entre deux positions de fermeture dans lesquelles il bute par une surface d'étanchéité (66, 69) contre l'un des sièges de soupape (60, 74) alors que la chambre de pression de commande (48) est séparée de la chambre de décharge (12), et lorsque l'organe de soupape de commande (62 ; 162) est disposé entre ses deux positions de fermeture la chambre de pression de commande (48) est reliée à la chambre de décharge (12),
    caractérisé en ce que
    l'organe de fermeture de soupape (62 ; 162) est un piston creux, la première surface d'étanchéité (66) étant disposée à l'intérieur de l'organe de soupape de commande (62 ; 162) et la deuxième surface d'étanchéité (69) se trouvant sur la face extérieure de celui-ci.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    les deux sièges de soupape (60, 74) présentent une section transversale au moins sensiblement de mêmes dimensions.
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce qu'
    un embout (52) pénètre dans l'organe de soupape de commande (62 ; 162) et comporte prévu un canal (58) s'étendant jusqu'à la chambre de pression de commande (48) débouchant dans l'organe de soupape de commande (62 ; 162) sur une chambre de pression (64) dont la communication avec la chambre de décharge (12) est commandée par l'organe de soupape de commande (62 ; 162).
  4. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    la première surface d'étanchéité (66) prévue à l'intérieur de l'organe de soupape de commande (62 ; 162) coopère avec la zone d'extrémité de l'embout (52) servant de premier siège de soupape (60) et commande une communication de la chambre de pression (64) avec un canal d'écoulement (65) prévu dans l'organe de soupape de commande (62 ; 162).
  5. Injecteur de carburant selon la revendication 4,
    caractérisé en ce que
    la deuxième surface d'étanchéité (69) disposée sur la face extérieure de l'organe de soupape de commande (62 ; 162) se trouve dans la zone de l'embouchure du canal d'écoulement (65) et coopère avec le deuxième siège de soupape (74) disposé sur un élément de boítier (56) de la soupape de commande (16), et commande ainsi une communication du canal d'écoulement (65) avec la chambre de décharge (12).
  6. Injecteur de carburant selon l'une quelconque des revendications 3 à 5,
    caractérisé en ce que
    la force de réglage générée par l'actionneur piézoélectrique (80) est renforcée par une amplification hydraulique qui présente une chambre de travail (78) délimitée par l'organe de soupape de commande (62), entre l'embout (52) et l'organe de soupape de commande (62) une zone d'étanchéité (63) sépare la chambre de pression (64) de la chambre de travail (78), et la zone d'étanchéité (63) présente une communication (88, 89, 90, 91) avec une chambre de décharge (12).
  7. Injecteur de carburant selon l'une quelconque des revendications 4 à 6,
    caractérisé en ce que
    l'organe de soupape de commande (62) est sollicité par la force de rappel en direction du premier siège de soupape (60) sur l'embout (52).
  8. Injecteur de carburant selon la revendication 5 ou 6,
    caractérisé en ce que
    l'organe de soupape de commande (162) est sollicité par la force de rappel en direction du deuxième siège de soupape (74) sur l'élément de boítier (56).
EP00993183A 1999-11-11 2000-11-10 Soupape d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP1252433B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19954288 1999-11-11
DE19954288A DE19954288A1 (de) 1999-11-11 1999-11-11 Kraftstoffeinspritzventil für Brennkraftmaschinen
PCT/DE2000/004011 WO2001038712A2 (fr) 1999-11-11 2000-11-10 Soupape d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP1252433A2 EP1252433A2 (fr) 2002-10-30
EP1252433B1 true EP1252433B1 (fr) 2005-08-31

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EP00993183A Expired - Lifetime EP1252433B1 (fr) 1999-11-11 2000-11-10 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (7)

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US (1) US6581850B1 (fr)
EP (1) EP1252433B1 (fr)
JP (1) JP2003515045A (fr)
KR (1) KR100717522B1 (fr)
CZ (1) CZ295475B6 (fr)
DE (2) DE19954288A1 (fr)
WO (1) WO2001038712A2 (fr)

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DE10104618A1 (de) * 2001-02-02 2002-08-08 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE10157419A1 (de) * 2001-11-23 2003-06-12 Bosch Gmbh Robert Leckagereduzierte Druckversorgung für Kraftstoffinjektoren
GB0215490D0 (en) * 2002-07-04 2002-08-14 Delphi Tech Inc Control valve arrangement
DE10247903A1 (de) * 2002-10-14 2004-04-22 Robert Bosch Gmbh Druckverstärkte Kraftstoffeinspritzeinrichtung mit innenliegender Steuerleitung
FI117805B (fi) * 2003-06-17 2007-02-28 Waertsilae Finland Oy Järjestely polttoaineen syöttölaitteistossa
DE10352736A1 (de) * 2003-11-12 2005-07-07 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Nadeleinspritzung
DE602004004254T2 (de) * 2004-06-30 2007-07-12 C.R.F. S.C.P.A. Servoventil zum Steuern eines Einspritzventils einer Brennkraftmaschine
DE102005008973A1 (de) * 2005-02-28 2006-08-31 Robert Bosch Gmbh Einspritzdüse
EP1731752B1 (fr) * 2005-05-27 2010-01-20 C.R.F. Società Consortile per Azioni Soupape asservie de contrôle de carburant et injecteur de carburant avec une telle soupape
DE102006036779A1 (de) * 2006-08-07 2008-02-14 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Nadelsteurung und Servoventil-Unterstützung
DE102009026567A1 (de) * 2009-05-29 2010-12-02 Robert Bosch Gmbh Kraftstoffinjektor mit Druckverstärkerkolben

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DE19624001A1 (de) * 1996-06-15 1997-12-18 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
US5779149A (en) * 1996-07-02 1998-07-14 Siemens Automotive Corporation Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke
GB9616521D0 (en) * 1996-08-06 1996-09-25 Lucas Ind Plc Injector
DE19732802A1 (de) * 1997-07-30 1999-02-04 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
US6199533B1 (en) * 1999-02-01 2001-03-13 Cummins Engine Company, Inc. Pilot valve controlled three-way fuel injection control valve assembly
DE19813983A1 (de) 1998-03-28 1999-09-30 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
US5875764A (en) * 1998-05-13 1999-03-02 Siemens Aktiengesellschaft Apparatus and method for valve control
DE19900033A1 (de) * 1999-01-02 2000-07-06 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE19950224A1 (de) * 1999-10-19 2001-04-26 Bosch Gmbh Robert Doppelschaltendes Steuerventil für einen Injektor eines Kraftstoffeinspritzsystems für Brennkraftmaschinen mit kugelförmigem Stellglied

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Publication number Publication date
JP2003515045A (ja) 2003-04-22
DE19954288A1 (de) 2001-05-17
CZ295475B6 (cs) 2005-08-17
CZ20012468A3 (cs) 2002-11-13
WO2001038712A2 (fr) 2001-05-31
DE50011086D1 (de) 2005-10-06
US6581850B1 (en) 2003-06-24
WO2001038712A3 (fr) 2001-12-27
EP1252433A2 (fr) 2002-10-30
KR20010101466A (ko) 2001-11-14
KR100717522B1 (ko) 2007-05-14

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