EP2194543B1 - Actionneur solénoïde - Google Patents

Actionneur solénoïde Download PDF

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Publication number
EP2194543B1
EP2194543B1 EP08170602.0A EP08170602A EP2194543B1 EP 2194543 B1 EP2194543 B1 EP 2194543B1 EP 08170602 A EP08170602 A EP 08170602A EP 2194543 B1 EP2194543 B1 EP 2194543B1
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EP
European Patent Office
Prior art keywords
electromagnetic coil
armature
electromagnetic
solenoid actuator
polarity
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.)
Active
Application number
EP08170602.0A
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German (de)
English (en)
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EP2194543A1 (fr
Inventor
Eric Charleux
Benoit Derouane
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.)
Delphi International Operations Luxembourg SARL
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Delphi International Operations Luxembourg SARL
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Publication date
Application filed by Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to EP08170602.0A priority Critical patent/EP2194543B1/fr
Publication of EP2194543A1 publication Critical patent/EP2194543A1/fr
Application granted granted Critical
Publication of EP2194543B1 publication Critical patent/EP2194543B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • H01F7/1646—Armatures or stationary parts of magnetic circuit having permanent magnet
    • 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
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0019—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of electromagnets or fixed armatures
    • 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
    • F02M63/0024—Valves characterised by the valve actuating means electrical, e.g. using solenoid in combination with permanent magnet
    • 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
    • F02M63/0059—Arrangements of valve actuators
    • F02M63/0063—Two or more actuators acting on a single valve body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1692—Electromagnets or actuators with two coils

Definitions

  • the present invention relates to solenoid actuators for use in fuel injectors for internal combustion engines.
  • the present invention relates to a double acting solenoid actuator for driving a discharge valve which is used to control the fuel pressure within a needle control chamber.
  • the actuator provided with two electromagnetic coils used to enable movement of the actuator armature in a first direction and a permanent magnet to enable movement of the actuator armature in a second direction, opposite to the first direction.
  • a conventional solenoid actuator drives a discharge valve which is used to control the opening of the injector needle.
  • An injector of this type is described in EP 1 163 440 .
  • the injector utilises a single acting solenoid actuator comprising an armature which passes through an electromagnetic coil and is connected to the discharge valve member.
  • an electrical current is supplied to the electromagnetic coil and the resultant electromagnetic field draws the armature into the coil such that the connected discharge valve member is moved away from the discharge valve seat.
  • the supply of electrical current to the electromagnetic coil is stopped and the armature is forced out of the coil under the action of a helical compression spring until the valve member comes to rest against the valve seat.
  • EP 1 066 467 describes a solenoid actuator having an armature with an electromagnetic coil located on either side of it such that an electrical current is supplied to a first coil to move the armature and the connected discharge valve member into a closed position and an electrical current is supplied to the second coil to move the armature and the connected discharge valve member into an open position.
  • Such an actuator can provide the necessary closing force in a relatively small size.
  • a supply of electrical current must be provided to the first coil to maintain the discharge valve in the closed position the arrangement is not energy efficient. This is because for the greater portion of the operational life of an injector the discharge valve remains in the closed position. Consequently, there is a need for an improved solenoid actuator that is able to operate in an injector supplied with fuel at an increased pressure and that is electrically efficient.
  • GB 2 447 769 discloses the preamble of claim 1.
  • a solenoid actuator with a double action for a fuel injector comprising, an armature, a first electromagnetic coil which, when energised in use, has an electromagnetic field which acts to move the armature in a first direction and a second electromagnetic coil, characterised in that the polarity of the second electromagnetic coil when it is energised in use is opposite to the magnetic field of a permanent magnet which magnetic field acts to move the armature in a second direction.
  • This arrangement is advantageous because the permanent magnet can be used to retain the actuator in one position without the need for application of current to an electromagnetic coil, thereby yielding benefits in reduced electrical consumption.
  • the solenoid actuator further comprises a first core associated with the first electromagnetic coil and a second core associated with the second electromagnetic coil and the permanent magnet, wherein, in use, the magnetic fields pass through the first and second cores and wherein there is provided an air gap between the first and second cores, within which air gap the armature is located.
  • the solenoid actuator may further comprise a valve member attached to the armature, wherein, in use, movement of the armature moves the valve member and causes a valve to be opened or closed.
  • a method of operating a solenoid actuator wherein the polarity of the electromagnetic field generated by the first electromagnetic coil is identical to the polarity of the electromagnetic field generated by the second electromagnetic coil.
  • the solenoid actuator is characterised by having a relatively high operating force.
  • a third aspect of the present invention there is provided an alternative method of operating a solenoid actuator wherein the polarity of the electromagnetic field generated by the first electromagnetic coil is opposite to the polarity of the electromagnetic field generated by the second electromagnetic coil.
  • the solenoid actuator is characterised by having a relatively high operating speed.
  • Figure 1 illustrates a solenoid actuated discharge valve assembly 1, according to the first preferred embodiment of the present invention.
  • the assembly 1 is cylindrical and it is split into four cylindrical sections.
  • the term 'upper' will be used to describe a part of the assembly 1 located distally from the nozzle of the fuel injector into which it is to be fitted and the term 'lower' will be used to describe a part of the assembly 1 that is located proximally to the nozzle of that fuel injector.
  • the assembly 1 comprises, in axial order from the lower side to the upper side, a discharge valve housing 3; a lower electromagnetic coil housing 5; a spacer 7; and an upper electromagnetic coil housing 9.
  • the discharge valve housing 3 is provided on its upper face with a cylindrical recess 13.
  • a fuel outlet passage 17 passes through the valve housing 3, from the upper face to the lower face.
  • the fuel outlet passage 17 is aligned coaxially with the longitudinal axis of the assembly 1 and is provided at its upper end with a valve seat 19.
  • the lower electromagnetic coil housing 5 comprises two parts.
  • a hollow, circular cross-section, tubular part 21 and a circular cross-section cylindrical core 23 which is located within the tubular part 21 and aligned coaxially with the longitudinal axis of the assembly 1.
  • the core 23 is provided with a co-axially aligned bore 25 from its upper face to its lower face.
  • a hollow cylindrical permanent ring magnet 27 Located within the annular space between the tubular part 21 and the core 23 is a hollow cylindrical permanent ring magnet 27.
  • the radially outer face of the permanent ring magnet 27 mates with the radially inner face of the tubular part 21 and the radially inner face of the permanent ring magnet 27 mates with the radially outer face of the core 23.
  • the lower face of the permanent ring magnet 27 is aligned with the lower faces of the tubular part 21 and the core 23.
  • the permanent ring magnet 27 extends in an axial direction towards the upper face of the lower coil housing 5. The distance by which it extends, i.e. its thickness, is dependent upon the flux concentration that is required from the permanent ring magnet 27 in order to be able to close the discharge valve against the fuel pressure and to maintain the discharge valve in a closed position.
  • the lower electromagnetic coil 29 Above the permanent ring magnet 27, within the annular space is the lower electromagnetic coil 29.
  • the lower surface of the lower electromagnetic coil 29 contacts the upper surface of the permanent ring magnet 27.
  • the spacer 7 is a hollow cylindrical ring and is made of a non-magnetic material, to prevent magnetic flux, from the lower electromagnetic coil 29 and the permanent ring magnet 27, passing through the lower electromagnetic coil housing 5 and into the upper electromagnetic coil housing 9.
  • the upper electromagnetic coil housing 9 is provided with a coaxially aligned blind annular recess 31 which passes from the lower face towards the upper face of the upper electromagnetic coil housing 9.
  • the upper electromagnetic coil 33 Within the annular recess 31 is contained the upper electromagnetic coil 33.
  • the upper face of the upper electromagnetic coil 33 is located adjacent to the upper, blind, face of the recess 31.
  • the lower surface of the coil 33 is spaced away from the lower surface of the upper electromagetic coil housing 9, such that an air gap 44 is created within the recess 31.
  • the upper electromagnetic coil housing 9 is also provided with a blind cylindrical recess 35 which extends coaxially from the lower surface of the upper electromagnetic coil housing 9.
  • Within the recess 35 there is located a helical compression spring 37 which in an uncompressed state extends outside of the recess 35. At its upper end, the spring 37 presses against the upper, blind, face of the recess 35. At its lower end the helical compression spring 37 presses against an armature 39.
  • the armature 39 is cylindrical and is aligned coaxially within the assembly 1.
  • the armature 39 is located within a cylindrical recess 40 created between the lower electromagnetic coil housing 5 and the upper electromagnetic coil housing 9 by the spacer 7.
  • the thickness of the armature 39 is less than the axial distance between the upper face of the lower electromagnetic coil housing 5 and the lower face of the upper electromagnetic coil housing 9.
  • a cylindrical discharge valve member 41 is attached to the lower surface of the armature 39.
  • the discharge valve member 41 is coaxially aligned within the assembly 1 and is slideable within the bore 25 provided in the core 23 of the lower electromagnetic coil housing 5.
  • the discharge valve member 41 is provided with a hemi-spherical discharge valve face 43 that is shaped to fit against the discharge valve seat 19, that is provided on the valve housing 3, such that when the discharge valve face 43 is seated against the discharge valve seat 19 a fluidtight seal is created which prevents the flow of fuel through discharge passageway 17.
  • the armature 39 In operation, when there is no injection of fuel being made from the fuel injector, the armature 39 is held in its lowermost position by the force resulting from the magnetic field created by the permanent ring magnet 27.
  • the magnetic field from the permanent ring magnet is shown in the lower half of Figures 1 and 2 and identified with the letter A. In the lowermost position, the discharge valve face 43 is seated against the discharge valve seat 19 and no fuel passes through the discharge passageway 17. As a result there is no decrease in the fuel pressure within the needle control chamber, and the injector needle remains in a closed position.
  • the permanent ring magnet 27 is configured so that it produces a magnetic field in a first magnetic circuit A which passes through the armature 39 and the air gap 44.
  • the magnetic field in the magnetic circuit A produces the force which, acting downwardly and in combination with the downwards force from the helical compression spring 37, holds the armature 39 in the lowermost position, as shown in Figure 1 (although, it should be noted that the magnetic field alone can provide the necessary force to move the armature into the lowermost position and retain it in that position).
  • the direction of the magnetic circuit A in the permanent ring magnet 27 is from the radially outer side of the permanent ring magnet 27 to the radially inner side of the permanent ring magnet 27, the flux travelling upwardly on the radially outer side.
  • the magnetic circuit A passes through the armature 39 and the air gap 44, wherein the magnetic flux is travelling upwardly on the radially outer side.
  • an electrical current is supplied to the lower electromagnetic coil 29, such that a lower electromagnetic field is generated.
  • the electromagnetic coil 29 is configured to produce an electromagnetic field which cancels out the magnetic field of the permanent magnet 27.
  • an electrical current is supplied to the upper electromagnetic coil 33, such that an upper electromagnetic field, having a second magnetic circuit B, is generated.
  • the magnetic circuit B passes through the armature 39 and the air gap 44, wherein the flux is travelling downwardly on the radially outer side.
  • the upper electromagnetic field produces a force which moves the armature 39 into its uppermost position, such that the discharge valve is opened.
  • the electrical supplies to the upper and lower electromagnetic coils 33,29 are stopped.
  • the downwardly acting force on the armature 39 generated by the magnetic field from the permanent ring magnet 27 in combination with the helical compression spring 37 then act to move the armature downwards so that the discharge valve face 43 is located against the discharge valve seat 19, such that the discharge valve is closed.
  • the pressure with the fuel injector needle control chamber then builds to a point at which the fuel injector needle is moved downwards, against a valve face, thereby closing the fuel injection valve.
  • Figure 2 illustrates the second preferred embodiment of the present invention which is structurally largely the same as the first embodiment. Equivalent features have been given the same reference numerals prefixed with the number 2.
  • the operation of the second embodiment differs in that a magnetic circuit C in the upper electromagnetic coil 233 passing through the armature 239 and the air gap 244, is in the opposite sense to the magnetic circuit B of the first embodiment.
  • the magnetic circuit C passes through the armature 239 and the air gap 244, wherein the magnetic flux is travelling upwardly on the radially outer side.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (5)

  1. Actionneur à solénoïde à double action pour un injecteur de carburant comprenant une armature (39), une première bobine électromagnétique (33) qui, lorsqu'elle est excitée en utilisation, a un champ électromagnétique qui agit pour déplacer l'armature (39) dans une première direction, une seconde bobine électromagnétique (29), un aimant permanent dont le champ magnétique agit pour déplacer l'armature (39) dans une seconde direction, un premier noyau (9) associé à la première bobine électromagnétique (33), et un second noyau (23) associé à la seconde bobine électromagnétique (29) et à l'aimant permanent (27),
    caractérisé en ce que la polarité du champ électromagnétique généré par la seconde bobine électromagnétique (29) lorsqu'elle est excitée en utilisation est opposée à celle du champ magnétique de l'aimant permanent (27), le premier noyau (9) étant doté d'un évidement borgne cylindrique (35) qui s'étend coaxialement depuis la surface inférieure du premier noyau (9), et un ressort de compression hélicoïdal (37) qui est situé à l'intérieur de l'évidement (35) et qui, dans un état non comprimé, s'étend à extérieur de l'évidement (35).
  2. Actionneur à solénoïde selon la revendication 1, dans lequel, en utilisation, le champ magnétique passe à travers le premier et le second noyau (9, 23), et dans lequel il est prévu un intervalle (44) entre le premier et le second noyau (9, 23), l'armature (39) étant située à l'intérieur de cet intervalle (44).
  3. Actionneur à solénoïde selon la revendication 1 ou 2, comprenant en outre un élément de valve (41) attaché à l'armature (39), dans lequel, en utilisation, un mouvement de l'armature (39) déplace l'élément de valve (41) et provoque l'ouverture ou la fermeture d'une valve.
  4. Procédé pour le fonctionnement d'un actionneur à solénoïde selon l'une quelconque des revendications 1, 2 ou 3, dans lequel la polarité du champ électromagnétique généré par la première bobine électromagnétique (33) est identique à la polarité du champ électromagnétique généré par la seconde bobine électromagnétique (29).
  5. Procédé pour le fonctionnement d'un actionneur à solénoïde selon l'une quelconque des revendications 1, 2 3, dans lequel la polarité du champ électromagnétique généré par la première bobine électromagnétique (33) est opposée à la polarité du champ électromagnétique généré par la seconde bobine électromagnétique (29).
EP08170602.0A 2008-12-03 2008-12-03 Actionneur solénoïde Active EP2194543B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08170602.0A EP2194543B1 (fr) 2008-12-03 2008-12-03 Actionneur solénoïde

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08170602.0A EP2194543B1 (fr) 2008-12-03 2008-12-03 Actionneur solénoïde

Publications (2)

Publication Number Publication Date
EP2194543A1 EP2194543A1 (fr) 2010-06-09
EP2194543B1 true EP2194543B1 (fr) 2017-08-23

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ID=40386305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08170602.0A Active EP2194543B1 (fr) 2008-12-03 2008-12-03 Actionneur solénoïde

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EP (1) EP2194543B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0919645D0 (en) 2009-11-10 2009-12-23 Sentec Ltd Flux switched fuel injector
GB201207289D0 (en) 2011-06-14 2012-06-06 Sentec Ltd Flux switch actuator
DE102014117702A1 (de) * 2014-12-02 2016-06-02 Bernd Hopke Elektro-Aktuator
CN113623103B (zh) * 2021-10-08 2024-05-10 重油高科电控燃油喷射系统有限公司 用于双燃料喷射器的电磁阀

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351893A (en) * 1993-05-26 1994-10-04 Young Niels O Electromagnetic fuel injector linear motor and pump
US6036120A (en) 1998-03-27 2000-03-14 General Motors Corporation Fuel injector and method
DE60022991T2 (de) 1999-03-18 2006-07-13 Delphi Technologies, Inc., Troy Kraftstoffinjektor
GB0705487D0 (en) * 2007-03-22 2007-05-02 Bifold Fluidpower Ltd A latching solenoid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2194543A1 (fr) 2010-06-09

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