EP3420217B1 - Injecteur de carburant pour un moteur à combustion - Google Patents

Injecteur de carburant pour un moteur à combustion Download PDF

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Publication number
EP3420217B1
EP3420217B1 EP17706474.8A EP17706474A EP3420217B1 EP 3420217 B1 EP3420217 B1 EP 3420217B1 EP 17706474 A EP17706474 A EP 17706474A EP 3420217 B1 EP3420217 B1 EP 3420217B1
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EP
European Patent Office
Prior art keywords
fuel
actuator
electrical
contact
conductor
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.)
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Application number
EP17706474.8A
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German (de)
English (en)
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EP3420217A1 (fr
Inventor
Xavier LALE
Bruno Bimbenet
Christophe Tapin
Jean-Luc BEDUNEAU
Laurent Doradoux
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Delphi Technologies IP Ltd
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Delphi Technologies IP Ltd
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Publication of EP3420217A1 publication Critical patent/EP3420217A1/fr
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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing

Definitions

  • the present invention relates to a fuel injector for a combustion engine. More specifically it relates to a kind of fuel injector having a head provided with an electrical connector adapted to provide connections from and to an ECU to selectively energize an actuator via electrical connections to start and stop fuel injection pulses, a fuel supply connection for supplying fuel into the injector at an elevated pressure, a fuel return connection for returning fuel at a lower pressure, a fuel injection nozzle assembly having a nozzle body provided at an end with nozzle openings, a valve member axially guided in the nozzle body between an upper guide member and a lower guide, the valve member being adapted to be biased to close against a valve seat and inhibit fuel injection through the nozzle openings or to move away from the valve seat to enable fuel spray through the nozzle openings, a fuel passage communicating fuel from the supply connection to the nozzle openings, a branch from the fuel passage to a control chamber, an end of the valve member remote from the valve seat protruding in said chamber so that fuel pressure in the chamber urges the valve member towards
  • Fuel injectors of this kind are known per se and indeed the actuator can either be a solenoid type actuator or a piezoelectric actuator. Irrespective of the specific design of actuator that is used, the operation of the control valve to direct fuel from the branch to the return connection lowers the pressure operating in the chamber and enables the valve member to move away from the valve seat in an open position of the nozzle enabling a fuel injection pulse.
  • valve member is biased towards the valve seat, generally by a spring such as a compression coil springs, so that the valve member always moves in the closing direction once the elevated fuel pressure from the branch acts on the end face of the valve member.
  • the signal can also take a specific value when the valve member is in the fully open position.
  • close loop means typically comprise the electrical insulation of the needle relative to the nozzle body, with the exception of the moving seating face and fixed seating face that are electrically conductive. In this way the needle and nozzle body cooperate as an electrical switch part of an electrical circuit which is closed when the needle is in closed position and which is open when the needle is either in ballistic mode or in fully open position. Consequently, a 0-1 step signal can be measured and entered in an electronic control unit (ECU) controlling the fuel injection equipment as a feedback signal which is taken into account in the parameters of the control algorithm of the fuel injection equipment.
  • ECU electronice control unit
  • Such close loop means have been disclosed following various embodiments in applications WO2016/006840 PCT/EP2014/073662 , FR1456783 and FR1457078 .
  • a nozzle assembly in which an electrical circuit comprises the valve needle, the nozzle body, isolation means preventing electrical contact between the needle member and the nozzle body when the needle is in ballistic mode, between the open and the closed positions, so that an electrical signal enabling contact detection between the two seating faces is able to determine whether the valve member is in sealing contact with the valve seat.
  • the object underlying the present invention is to improve a fuel injector of the initially named kind by providing advantageous arrangements for an electrical path for transmitting the electrical switching signal through the injector in order to detect by an electrical change whether the nozzle is open or closed.
  • the fuel injector of the initially named kind further comprises a circuit for detecting by an electrical change whether the nozzle is open or closed, the circuit extending between the electrical connector and the upper guide member, the circuit including a resilient electrical link.
  • the resilient link expediently comprises a rigid conductor member and at least one axially resilient conductor member arranged in series with the rigid conductor.
  • the axially resilient conductor member can comprise a spring contact member.
  • This may either take the form of a resilient element such as a coil spring or a leaf spring or may be formed by solid contact pins resiliently supported on the rigid conductor member, for example a conductive bar or tube with hollow ends supporting coil springs urging the contact pins outwardly.
  • the resilient electrical link is provided with insulation except at the free ends of the contact pins. This design ensures good electrical contact is always achieved despite manufacturing tolerances and avoids the need to provide brazed or crimped connections.
  • the resilient electrical link is formed by a coil spring. This is a relatively inexpensive embodiment to realize.
  • the coil spring can be resilient over its whole length or can comprise a first portion having touching turns, said portion being axially non-resilient and a second portion in which the turns of the spring are distant from one another, said second portion being resilient.
  • the coil spring forming the resilient link is further provided with a third portion, the turns of the spring of said third portion being distant from one another, said third portion thereby being axially resilient.
  • the first portion is a central portion of the coil spring
  • the second portion is an extreme portion of the spring in contact with the upper guide member
  • the third portion is an opposite extreme portion of the spring in electrical contact with the contact member.
  • the coil spring is expediently provided with insulation other than at its ends generating electrical contact with the contact member and the upper guide member.
  • the circuit for detecting by an electrical change whether the nozzle is open or closed further comprises a conductor arranged along the electrical connections for the actuator to a position generally at a head end of the actuator, a contact member at the head end of the actuator maintained in electrical contact with the conductor and the resilient electrical link axially extending along the actuator, from the contact member to the upper guide member.
  • This arrangement reflects the fact that the alignment of the actuator relative to the body of the fuel injector and above all the angular position of the electrical link relative to the actuator as well as the relative position of the conductor at the junction between the actuator isolation member and the actuator can vary on assembly of the fuel injector due to manufacturing tolerances. By using a contact member of sufficient areal extent electrical contact problems due to alignment tolerances can be avoided.
  • the conductor and the resilient electrical link are directed parallel to a longitudinal axis of the actuator, but are not necessarily in line with one another but can rather be offset radially relative to each other.
  • the electrical connections for the actuator are conveniently electrically isolated by an isolation member extending through an axial bore provided in the injector body between the head and the actuator, and the insulated conductor for the circuit for detecting by an electrical change whether the nozzle is open or closed is expediently arranged inside the insolation member along the electrical connections to the actuator.
  • connections between the actuator and the head can extend through an axial bore or one or more axially parallel bores in an isolation member for the actuator extending between the head and the actuator and the conductor for the circuit detecting the closing of the valve member can extend through the same bore or one of the axial bores or through another axially directed bore of the isolation member.
  • the electrical connections for the actuator are electrically isolated by an isolation member extending through an axial bore provided in the injector body between the head and the actuator, and the insulated conductor for the circuit for detecting by an electrical change whether the nozzle is open or closed is arranged outside and along the isolation member.
  • the end part of the insulated conductor of the circuit for detecting by an electrical change whether the nozzle is open or closed is bent opposite to the head, i.e. remote from the head, through approximately a right angle to contact the contact member.
  • the contact member is expediently designed as a disc member generally arranged on the head of the actuator, said disc having an upper or lower face in electrical contact with the conductor and the lower face in electrical contact with the resilient electrical link. This design is particularly advantageous for the assembly of the fuel injector and of the electrical circuit for detecting by an electrical change whether the nozzle is open or closed.
  • the disc may expediently be provided with a nose portion radially extending beyond the actuator, the resilient electrical link being in contact with the under face of said nose portion.
  • the conductor for the circuit for detecting by an electrical change whether the nozzle is open or closed may expediently be welded or brazed to the disc.
  • the resilient link ensures good contact to the contact member and to the respective one of the valve member or valve guide irrespective of thermal growth that may occur in use.
  • the contact member comprises an axial disc generally coaxial to the actuator and surrounding the axial isolation member for the actuator extending between the head and the actuator
  • the axial disc can readily be contact the conductor and the electrical link at least over a range of angles adapted to cope with misalignment of the end of the conductor and the electrical link.
  • the contact member can be urged by a compression coil spring surrounding the isolation member for the actuator into contact with an end of the conductor positioned at the head end of the actuator.
  • This embodiment is compact, simple to assemble and relatively inexpensive to realize.
  • the resilient link ensures good contact to the contact member and to the respective one of the valve member or valve guide irrespective of thermal growth that may occur in use.
  • the circuit for detecting by an electrical change whether the nozzle is open or closed generally extends along a straight direction parallel and radially offset to the longitudinal axis of the injector, said circuit going from the head of the injector to the upper guide member.
  • the invention can be used with a variety of actuators such as a solenoid and a piezoelectric actuator.
  • the electrical circuit for detecting by an electrical change whether the nozzle is open or closed comprises a resistive coating, such as diamond like carbon (DLC), applied to at least one of the valve seat and a region of the valve member cooperating with the valve seat or on an element incorporated in the valve member.
  • a resistive coating such as diamond like carbon (DLC)
  • the conductor need not necessarily be guided through the isolation member for the actuator. It can, for example be directed parallel to an axis of the actuator in an outer region of a body of the actuator.
  • the contact member can comprise either a conductive disc or a radially directed element and the electric link comprises an insulated conducting element disposed generally parallel to an axis of the valve member, but generally further from the axis than the said conductor.
  • the radially directed contact member facilitates the radial offset between the conductor and the electrical link.
  • a fuel injector 10 having a head 12 provided with an electrical connector 14 adapted to provide connections 15 from and to an ECU 16 to selectively energize an actuator 18 via electrical connections 15, 102 to start and stop fuel injection pulses.
  • a fuel supply connection 20 is provided at the head 12 for supplying fuel into the injector 10 at an elevated pressure.
  • a fuel return connection 22 is provided for returning fuel at a lower pressure to a schematically illustrated fuel storage tank 24.
  • the injector 10 has a fuel injection nozzle assembly 26 having a nozzle body 41 provided at an end with nozzle openings 28.
  • a valve member 32 is axially guided in the nozzle body 41 between an upper guide member 31 and a lower guide 29.
  • the valve member 32 is adapted to be biased by a compression coil spring 36 to close against a valve seat 38 and inhibit fuel injection through the nozzle openings 28 or to move away from the valve seat 38 to enable fuel spray through the nozzle openings 28.
  • the valve seat 38 is provided in the lower guide 29 just above the nozzle openings 28.
  • a fuel passage 42 communicates fuel from the supply connection 20 to the nozzle openings 28.
  • a branch leads from the fuel passage 42 to a control chamber 34 and an end 33 of the valve member 32 remote from the valve seat 38 protrudes into the chamber 34. Fuel pressure in the chamber 34 urges the valve member 32 towards the valve seat 38 in a closed position of the nozzle.
  • a control valve 52 is operated by the actuator 18 to allow fuel from control chamber 34 to pass (via a non-illustrated passage) to the return connection 22 thereby lowering the pressure in the chamber 34 and enabling the valve member 32 to move away from the valve seat 38 into an open position of the nozzle enabling said fuel injection.
  • the fuel injector further comprises a circuit for detecting by an electrical change whether the nozzle is open or closed. The circuit extends between the electrical connector 14 and the upper guide member 31 and includes a resilient electrical link 126.
  • the nozzle body 41 has separate coaxially disposed upper and lower guide members 29 and 31.
  • the upper and lower guide members 29, 31 could be formed in one part.
  • valve member 32 has a generally conical sealing surface 40 which seats against the generally conical valve seat 38 of the lower valve guide member 29.
  • control valve 52 operates to lower the pressure in the chamber 34 the valve member 32 is able to move within the chamber 34 away from the valve seat 38 under the influence of fuel pressure in the passage 42 to eject fuel through the nozzle openings 28, i.e. to inject it into a cylinder of an associated combustion engine (not shown).
  • the fuel injector 10 is normally fed with high pressure fuel from a common rail 54 (only shown in Fig. 1 ) of the associated engine (not shown).
  • the common rail 54 is fed with fuel from the fuel tank 24 via a low pressure pump 56 in or at the tank 24 and via a high pressure pump 58, so that the elevated fuel pressure prevailing at the fuel supply connection 20 is around 2000 bar and above.
  • one or more filters and fuel cut off valves can also be included in the fuel supply system.
  • each cylinder is equipped with a respective fuel injector 10 and the fuel injectors are all connected to the common rail.
  • nozzle assembly 26 and control valve assembly 52 are inside the cap nut 96, whereas the actuator 18 and the wires 14 connecting to it are located in a bore drilled in the NHB 92 (Nozzle Holder Body) to which the cap nut is connected by a threaded connection.
  • the actuator 18, the control valve 52 and the valve guide members 29, 31 have finely machined mating surfaces at the junctions between them that are held together in fuel-tight manner by the cap nut 96 which has internal threads 98 engaging external threads 100 on the NHB 92.
  • the other electrical connection must be an insulated connection which needs to be conducted through the fuel injector via the third lead 17 connecting the fuel injector to the ECU.
  • This is the so called closed loop electrical conductor, which together with the earth connection enables closed loop control of the control valve 52 and thus of the opening and closing of the valve member 32, i.e. its movement away from and towards the valve seat 38.
  • the closed loop conductive path of the circuit comprises an insulated conductor 110 extending between the head 12 of the fuel injector through a central bore 112 in the isolation member 102 for the actuator 18 to a position generally at a head end 114 of the actuator 18.
  • isolation member 102 is actually part of the actuator 18, basically it is an overmoulding of insulating resin which surrounds blades or wires 15 which control the actuator (solenoid) 18.
  • the insulated conductor 110 passing through the central bore 112 is bent radially outwardly (radially outwardly directed portion 116) and lies directly beneath a disc-like contact member 118 at the head end 114 of the actuator.
  • the contact member 118 which comprises an axial disc surrounding the isolation member 102 is urged in this embodiment by the actuator clamping spring 120, a compression coil spring, against the end portion 116 of the electrical conductor 110.
  • the spring 120 surrounds the actuator isolation member 102 within a recess 122 of the NHB and bears against an insulating washer 124, which in turn presses the disc-like contact member into electrical contact with the bent end portion 116 of the conductor 110 from which the insulation has been removed.
  • the disc-like contact member 118 is insulated from the armature of the actuator 18 and from the actuator isolation member 102 by suitable electrical insulation (not shown in Figs. 1 and 2 ).
  • the conductor 110 is made of a metal wire and is insulated either by shrink tubing or by overmoulding it into the insulating resin of the isolation member 102 which forms part of the solenoid of the actuator. It can also be located alongside the solenoid control wire 15 and overmoulded with resin at the same time. In this case all these wires pass through the central bore 112 of the isolation member 102 and the conductor 110 is also insulated from the wires 15. This enables a particularly compact arrangement.
  • the electrical contact to the bent end portion 116 takes place in a radially inner portion of the contact member 118.
  • the radially outer portion of the disc-like contact member 118 is in electrical contact with an insulated resilient electrical link 126 which extends between the contact member 118 and one of the valve member 32 and the valve guide member 31. In this case it connects to the valve guide member 31 through a bore in an outer portion of the body of the control valve 52 directed axially parallel to the central axis of the control valve 52. It will be appreciated that in the design of Figs. 1 and 2A , 2B the electrical contact between the bent end portion 116 of the conductor 110 and the contact member 118 and the contact between the electrical link 116 and the contact member 118 is highly insensitive to angular misalignment of the electrical link 126 and the conductor 110, i.e. its bent end 116.
  • the conductor 110 could be welded or brazed to the contact member 118.
  • the design is such that the insulated electrical ink passes through the NBH 92, obliquely through a bore in the upper part 31 of the valve guide 30 and then through the valve member 32 to the conical seating surface 40 of the valve member 32.
  • An insulating layer or layer (not shown) is provided at the conical seating surface 40 or at the mating conical seat of the valve guide and the electrical resistance of this layer or these layers changes in response to contact pressure of the valve member against the valve seat 38 at the lower valve guide member 29.
  • the lower valve guide member 29 together with the cap nut 96 and the NHB 92 forms the earth connection to the ECU. It is of course necessary to provide insulation between the valve member 32 and the upper and lower valve guide members 29 and 31 at other points where contact between these elements may occur, for example at sliding surfaces of the valve member 32 close to its lower end that serve to guide it in the lower valve guide member 29.
  • valve guide insulating layers In a design with a two part valve guide insulating layers must also be provided there between the valve member 32 and the upper part 31, and between the upper valve guide member 31 and the lower valve guide member 29 and any related structure, so that a uniquely defined electrical path exists.
  • the closed loop link enables the ECU to measure the electrical resistance between the valve member 32 and the valve seat 38 at the valve seat 38.
  • the return path of the circuit is through the valve member 32 to the grounded structure of the fuel injector and ultimately to the ECU 16.
  • the electrical change detected by the ECU can be at least one of a change in resistance, a change in potential and a change in current.
  • the resilient electrical link 126 can be realized in different ways.
  • the resilient link 126 expediently comprises a rigid conductor member 130 and at least one axially resilient conductor member 134 arranged in series with the rigid conductor 130.
  • the axially resilient conductor member can comprise a spring contact member 134.
  • This may either take the form of a resilient element such as a coil spring or a leaf spring or may be formed as shown in Figs. 1 and 2A by solid contact pins resiliently supported at the rigid conductor member 130.
  • the rigid conductor member is a conductive bar or tube with hollow ends supporting coil springs (not shown) urging the contact pins 134 outwardly.
  • the resilient electrical link is provided with insulation except at the free ends of the contact pins.
  • Fig. 2B shows an alternative design of the resilient link 126 but is otherwise essentially identical to the design of Figs. 1 and 2A so that details of the fuel injector 10 not related to the resilient link will not be unnecessarily repeated and the previous description will be understood to apply also to Fig. 2B .
  • the resilient electrical link 126 is a coil spring 136.
  • the coil spring 136 comprises a first portion 138 having touching turns whereby this portion is axially non-resilient, at least in compression, and a second portion 140 in which the turns of the spring are distant from one another whereby the said second portion is resilient both in compression and extension.
  • the coil spring 136 is further provided with a third portion 142 in which the turns of the spring are distant from one another, whereby the third portion 142 is also axially resilient in the same way as the second portion 140.
  • the first portion 138 is a central portion of the coil spring 136
  • the second portion 140 is an extreme portion of the spring in contact with the upper guide member 31
  • the third portion 142 is an opposite extreme portion of the spring 136 in electrical contact with the contact member 118. It is however not necessary to provide three distinct portions, just two, one stiff one and one resilient one are sufficient. It is unimportant where the resilient portion is located, it could be at either end of the rigid portion or indeed centrally disposed between two rigid portions. Clearly the ends of the coil spring contacting the contact member 118 and the valve member 32 need to be exposed to ensure electrical contact, otherwise they are separated by appropriate electrical insulation from the structure of the fuel injector 10. One way of doing this is to use insulating shrink tubing to surround the electrical link 126.
  • the conductor 110 is directed parallel to an axis X of the actuator 18 in an outer region 132 of the isolation member 102 of the actuator 18.
  • the contact member 118 can again comprise an axial disc.
  • the conductor 110 is expediently welded or brazed to a radially inner portion of the disc-like contact member 118.
  • the electrical link 126 which can be designed in any of the ways described with reference to Figs. 1 and 2 , conveniently contacts a radially outer region of the disc-like contact member 118.
  • the enlarged end view of the disc-like contact member 118 with the nose portion 119 shown in Fig. 3C shows that this design is also insensitive to angular misalignment of the insulated conductor 110 and the electrical link 126. Again all parts are insulated to prevent unwanted connections to ground.
  • Figs. 4A and 4B illustrate another embodiment in which the insulated conductor 110 is again directed parallel to an axis X of the actuator 18 in an outer region 132 of the isolation member 102 of the actuator 18.
  • the contact member 118 comprises a radially directed element and the electric link 126 comprises an insulated conducting element disposed generally parallel to an axis of the valve guide 30 but at a larger radius than the insulated conductor 110.
  • the insulated conductor 110, the insulated contact member 118 and the insulated electrical link 126 can be made in one piece.
  • the electrical link 126 preferably has a resilient contact to the upper valve guide member 31.
  • Figs. 5A to 5C show another alternative embodiment in which the insulated conductor 110 again passes through a central axial bore 112 of the isolation member 102 for the actuator 18.
  • the insulator is again bent outwardly to form an outwardly bent end portion 116.
  • the disc-like contact member is again pressed in this embodiment against an exposed electrically conductive surface of the conductor 110.
  • the construction is similar to that shown in Fig. 2 and again a coil spring for clamping the actuator can act on the disc-like contact member 118 via an insulating washer, although these details are not shown in this diagram.
  • connections 15 to the ECU lie in respective axially parallel bores in the isolation member 102 which are separated from but parallel to the central bore 112 which accommodates the closed loop link 104.
  • This embodiment is thus distinguished from that of Figs. 1 and 2A , 2B by the fact that the disc-like contact member 118 is welded here to the conductive link 126 and the fact that the wires 15 and the conductor 110 run in separate bores of the support member.
  • the invention also relates to a fuel injector 10 of the kind described in combination with an ECU 16 there being first and second connections 15 from the ECU 16 to the actuator 18 of the fuel injector 10, one of said connections 15 being a grounding connection and the other being a power connection, and also a third connection 17 for the said circuit (closed loop link 104) to the ECU 16.

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

Claims (12)

  1. Injecteur de carburant (10) ayant
    - une tête (12) dotée d'un connecteur électrique (14) adapté pour fournir des connexions (15) depuis et jusqu'à une unité de commande électronique (ECU) (16) afin d'exciter sélectivement un actionneur (18) via des connexions électriques (15, 102) pour démarrer et arrêter des impulsions d'injection de carburant,
    - une connexion d'alimentation de carburant (20) destinée à alimenter du carburant jusque dans l'injecteur (10) à une pression élevée,
    - une connexion de retour de carburant (22) destinée à ramener du carburant à une pression plus basse,
    - un assemblage formant buse d'injection de carburant (26) ayant
    - un corps de buse (41) doté, à une extrémité, d'ouvertures de buse (28),
    - un élément de vanne (32) axialement guidé dans le corps de buse (41) entre un élément de guide supérieur (31) et un guide inférieur (29), l'élément de vanne (32) étant adapté pour être sollicité de manière à fermer contre un siège de vanne (38) et à empêcher une injection de carburant à travers les ouvertures de buse (28), ou de manière à se déplacer en éloignement du siège de vanne (38) pour permettre une pulvérisation de carburant à travers les ouvertures de buse (28),
    - un passage à carburant (42) communiquant du carburant depuis la connexion d'alimentation (20) jusqu'aux ouvertures de buse (28),
    - une ramification depuis le passage à carburant (42) jusqu'à une chambre de commande (34), une extrémité de l'élément de vanne (32) éloignée du siège de vanne (38) se projetant dans ladite chambre (34) de sorte qu'une pression de carburant dans la chambre (34) force l'élément de vanne (32) en direction du siège de vanne (38) dans une position fermée de la buse, et
    - une vanne de commande (52) activée par l'actionneur (18) pour permettre à un carburant depuis la chambre de commande (34) de passer jusqu'à la connexion de retour (22), abaissant ainsi la pression dans la chambre (34) et permettant de déplacer l'élément de vanne (32) en éloignement du siège de vanne (38) dans une position ouverte de la buse permettant ladite injection de carburant,
    dans lequel l'injecteur de carburant comprend en outre un circuit destiné à détecter via un changement électrique si la buse est ouverte ou fermée, le circuit s'étendant entre le connecteur électrique (14) et l'élément de guide supérieur (31), le circuit incluant une liaison électrique résiliente (126), caractérisé en ce que
    ladite liaison résiliente (126) comprend un élément conducteur rigide (130) et au moins un élément conducteur axialement résilient (134) agencé en série avec le conducteur rigide (130) et
    dans lequel le circuit comprend en outre un conducteur (110) agencé le long des connexions électriques (15, 102) pour l'actionneur vers une position généralement à une extrémité de tête de l'actionneur (18), un élément de contact (118) à l'extrémité de tête de l'actionneur (18) maintenu en contact électrique avec le conducteur (110) et la liaison électrique résiliente (126) s'étendant axialement le long de l'actionneur, depuis l'élément de contact (118) jusqu'à l'élément de guide supérieur (31), et
    dans lequel l'élément de contact (118) est un élément de disque généralement agencé sur la tête de l'actionneur (18), ledit disque (118) ayant une face supérieure ou inférieure en contact électrique avec le conducteur (110) et la face inférieure étant en contact électrique avec la liaison électrique résiliente, et
    dans lequel l'élément de contact (118) est forcé par un ressort de compression (120) jusqu'en contact avec une extrémité (116) du conducteur (110) positionnée à l'extrémité de tête de l'actionneur (18).
  2. Injecteur de carburant (10) selon la revendication 1, dans lequel le conducteur (110) et la liaison électrique résiliente (126) sont dirigés parallèlement à un axe longitudinal (X) de l'actionneur (18).
  3. Injecteur de carburant (10) selon l'une ou l'autre des revendications 1 et 2, dans lequel les connexions électriques (15) pour l'actionneur (18) sont isolées électriquement par un élément d'isolation (102) s'étendant à travers un perçage axial prévu dans le corps d'injecteur entre la tête (12) et l'actionneur (18), et dans lequel le conducteur isolé (110) pour le circuit est agencé à l'intérieur de l'élément d'isolation (102) le long des liaisons électriques (15).
  4. Injecteur de carburant (10) selon l'une ou l'autre des revendications 1 et 2, dans lequel les connexions électriques (15) pour l'actionneur (18) sont isolées électriquement par un élément d'isolation (102) s'étendant à travers un perçage axial (112) prévu dans le corps d'injecteur entre la tête (12) et l'actionneur (18), et dans lequel le conducteur isolé (110) pour le circuit est agencé à l'extérieur et le long de l'élément d'isolation (102).
  5. Injecteur de carburant (10) selon l'une quelconque des revendications 1 à 4, dans lequel la partie d'extrémité (116) du conducteur isolé (110) opposée à la tête (12) est cintrée approximativement à angle droit pour être en contact avec l'élément de contact (118).
  6. Injecteur de carburant (10) selon la revendication 1, dans lequel le disque (118) est doté d'une portion de nez (119) s'étendant radialement au-delà de l'actionneur, la liaison électrique résiliente (126) étant en contact avec la face inférieure de ladite portion de nez (119).
  7. Injecteur de carburant (10) selon l'une quelconque des revendications 1 à 6, dans lequel le conducteur (110) est soudé ou brasé sur le disque (118).
  8. Injecteur de carburant (10) selon la revendication 1, dans lequel le circuit s'étend le long d'une direction en ligne droite parallèle et décalée radialement par rapport à l'axe longitudinal (X) de l'injecteur, ledit circuit allant depuis la tête (12) de l'injecteur jusqu'à l'élément de guide supérieur (31).
  9. Injecteur de carburant (10) selon l'une quelconque des revendications précédentes, dans lequel la liaison électrique résiliente (126) est un ressort à boudin (136).
  10. Injecteur de carburant (10) selon la revendication 9, dans lequel le ressort à boudin (136) comprend une première portion (138) ayant des spires jointives, ladite portion étant axialement non résiliente, et une deuxième portion (140) dans laquelle les spires du ressort sont distantes les unes des autres, ladite deuxième portion étant résiliente.
  11. Injecteur de carburant (10) selon la revendication 10, dans lequel le ressort à boudin (136) est en outre doté d'une troisième portion (142), les spires du ressort de ladite troisième portion (142) étant distantes les unes des autres, ladite troisième portion (142) étant axialement résiliente, et dans lequel la première portion (138) est une portion centrale du ressort à boudin (136), la deuxième portion (138) est une portion extrême du ressort en contact avec l'élément de guide supérieur (31), et la troisième portion (142) est une portion extrême opposée du ressort (136) en contact électrique avec l'élément de contact (118).
  12. Injecteur de carburant (10) selon l'une quelconque des revendications précédentes, dans lequel le circuit électrique comprend un revêtement résistif, tel qu'un carbone amorphe (DLC), appliqué à au moins un élément parmi le siège de vanne (38) et une région de l'élément de vanne (32) coopérant avec le siège de vanne (38), ou sur un élément incorporé dans l'élément de vanne (32).
EP17706474.8A 2016-02-26 2017-02-21 Injecteur de carburant pour un moteur à combustion Active EP3420217B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1603329.2A GB2547684A (en) 2016-02-26 2016-02-26 Fuel injector for a combustion engine
PCT/EP2017/053958 WO2017144479A1 (fr) 2016-02-26 2017-02-21 Injecteur de carburant pour un moteur à combustion

Publications (2)

Publication Number Publication Date
EP3420217A1 EP3420217A1 (fr) 2019-01-02
EP3420217B1 true EP3420217B1 (fr) 2020-04-22

Family

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Application Number Title Priority Date Filing Date
EP17706474.8A Active EP3420217B1 (fr) 2016-02-26 2017-02-21 Injecteur de carburant pour un moteur à combustion

Country Status (5)

Country Link
EP (1) EP3420217B1 (fr)
JP (1) JP2019507281A (fr)
CN (1) CN109154260B (fr)
GB (1) GB2547684A (fr)
WO (1) WO2017144479A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11067028B2 (en) 2019-01-16 2021-07-20 Caterpillar Inc. Fuel injector
US10746145B1 (en) * 2019-05-08 2020-08-18 Delphi Technologies Ip Limited Isolator for fuel injector
GB2585064B (en) * 2019-06-27 2021-11-10 Delphi Tech Ip Ltd Fuel injector with closed loop detection

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2925187A1 (de) * 1979-06-22 1981-01-08 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE19619523A1 (de) * 1996-05-15 1997-11-20 Bosch Gmbh Robert Kraftstoffeinspritzventil für Hochdruckeinspritzung
JPH11107873A (ja) * 1997-10-03 1999-04-20 Denso Corp 圧力制御装置及びそれを用いた蓄圧式燃料噴射装置
WO2005080786A1 (fr) * 2004-02-11 2005-09-01 Siemens Aktiengesellschaft Element de contact pour le pointeau de la soupape d'un injecteur de moteurs a combustion interne
JP2005307790A (ja) * 2004-04-20 2005-11-04 Denso Corp 流体制御装置
DE102005002796B4 (de) * 2005-01-20 2009-01-08 Continental Automotive Gmbh Ventilvorrichtung
DE102009045995A1 (de) * 2009-10-26 2011-06-09 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
EP2587267B1 (fr) * 2010-06-25 2016-12-07 NHK Spring Co., Ltd. Sonde de contact et unité de sonde
EP2713040B1 (fr) * 2012-09-26 2017-06-07 Delphi International Operations Luxembourg S.à r.l. Connecteur électrique
FR3023875A1 (fr) * 2014-07-15 2016-01-22 Delphi Int Operations Luxembourg Sarl Injecteur de carburant
FR3024183B1 (fr) * 2014-07-22 2019-07-26 Delphi Technologies Ip Limited Injecteur de carburant

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
WO2017144479A1 (fr) 2017-08-31
CN109154260B (zh) 2020-12-01
GB201603329D0 (en) 2016-04-13
JP2019507281A (ja) 2019-03-14
CN109154260A (zh) 2019-01-04
EP3420217A1 (fr) 2019-01-02
GB2547684A (en) 2017-08-30

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