EP2392815B1 - Composant magnétique et soupape d'injection dotée d'un composant magnétique - Google Patents

Composant magnétique et soupape d'injection dotée d'un composant magnétique Download PDF

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Publication number
EP2392815B1
EP2392815B1 EP20110166202 EP11166202A EP2392815B1 EP 2392815 B1 EP2392815 B1 EP 2392815B1 EP 20110166202 EP20110166202 EP 20110166202 EP 11166202 A EP11166202 A EP 11166202A EP 2392815 B1 EP2392815 B1 EP 2392815B1
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EP
European Patent Office
Prior art keywords
magnet
injection valve
magnetic
armature
permanent magnet
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
EP20110166202
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German (de)
English (en)
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EP2392815A1 (fr
Inventor
Marco Beier
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
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Robert Bosch GmbH
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Publication of EP2392815A1 publication Critical patent/EP2392815A1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0689—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means and permanent magnets

Definitions

  • the invention relates to a magnet assembly for an injection valve for injecting fuel into the combustion chamber of an internal combustion engine with a liftable injection valve member for releasing or closing at least one injection port, wherein the magnet assembly of the direct or indirect actuation of the injection valve member is used. Furthermore, a generic magnet assembly on the further features of the preamble of claim 1. Furthermore, the invention relates to an injection valve for injecting fuel into the combustion chamber of an internal combustion engine having a magnet assembly for direct or indirect actuation of the injection valve member.
  • the use of magnetic actuators for direct or indirect control of an injection valve has long been known from the prior art.
  • the solenoid actuator can first control a servo valve or actuate the injection valve member directly, as is the rule in gasoline injection systems, for example.
  • a magnet assembly for a fuel injection valve for example, from the published patent application DE 10 2008 001 968 A1 out.
  • the magnet assembly is designed as a solenoid valve, which causes a discharge of a control chamber and thus the opening of a nozzle needle in the open position, while in the closed position of the solenoid valve, a building up in the control chamber control pressure leads to closing of the nozzle needle.
  • the proposed magnet assembly thus serves the indirect actuation of the nozzle needle of the fuel injection valve.
  • the magnet assembly comprises a magnet coil inserted into a housing part of the magnet assembly as well as an armature cooperating with the magnet coil.
  • the armature is also designed as a closing element and is acted upon by the spring force of a closing spring in the direction of a valve seat of the solenoid valve.
  • a magnetic force is generated, which causes a lifting of the armature against the spring force of the closing spring and thus opening of the solenoid valve. If the energization of the solenoid is terminated, the spring force of the closing spring causes the return of the armature in the valve seat.
  • the spring force of the closing spring is sufficiently high to choose.
  • a high spring force has a negative effect on a fast opening behavior of the solenoid valve, since a sufficiently high magnetic force must be provided to overcome the force acting as a closing force high spring force.
  • the voltage is usually set high, so that high currents are generated in the solenoid actuator. If the high voltage is maintained in the holding phase of the solenoid valve, this in turn has a negative effect on the closing behavior of the solenoid valve. An increase in tension in the holding phase is also economically unreasonable.
  • a fuel injection valve with a magnetic actuator which has a magnetic coil cooperating with an armature. Furthermore, the magnetic actuator comprises a magnetic inner pole and a magnetic outer pole, which are connected in a region such that a mechanical weak point is formed.
  • a permanent magnet is proposed, which is arranged in the connecting region between the inner pole and the outer pole.
  • the permanent magnet should cause not only a mechanical reinforcement, but also a magnetic throttling, since the permanent magnet in the ferritic material of the outer pole generates a primary flux, so that only a reduced cross section is available for the secondary flux generated by the magnetic coil.
  • a multipole magnetic actuator which comprises a first and a second actuator acting on a lifting magnet.
  • at least one solenoid comprises at least one permanent magnet whose magnetic force acts on the same actuator, such as an armature of the magnetic actuator.
  • the permanent magnet is preferably annular and used with the lifting magnet in a coil window of the magnetic core.
  • the object of the present invention is to provide a magnet assembly for an ice-spraying valve whose use causes an improvement in the dynamics of the injection valve.
  • the proposed magnet assembly to allow an improvement in the dynamics of the injector while reducing the voltage.
  • the proposed magnet assembly for direct or indirect actuation of an injection valve member comprises a magnetic core, a magnetic coil accommodated in a recess of the magnetic core and cooperating with the magnetic one or more parts, liftable armature and at least one annular permanent magnet which generates a magnetic flux base, which at an energization of the solenoid causes a gain or attenuation of the magnetic force acting on the armature.
  • the permanent magnet is integrated in an annular outer pole or an annular inner pole of the magnetic core, wherein the outer pole and the inner pole of the magnetic core define the recess for receiving the magnetic coil in the radial direction.
  • the cross-sectional profile of the magnetic core is therefore preferably U-shaped.
  • the position of the permanent magnet is chosen such that the permanent magnet influences the polarity of the magnet assembly. This is the case when the magnetic base flux generated by the permanent magnet causes an amplification or weakening of the magnetic force when the magnetic coil is energized.
  • the basic magnetic flux of the permanent magnet causes amplification or weakening of the magnetic force acting on the armature depends essentially on whether the magnetic coil is in the same direction or in opposite directions with respect to the polarity the permanent magnet is energized.
  • the permanent magnet causes an amplification of the magnetic force acting on the armature, since the basic magnetic flux of the permanent magnet and the magnetic flux of the magnet coil are complementary.
  • the increase in the magnetic force leads to a rapid opening of the injection valve, since the permanent magnet makes its contribution to overcome the armature acting in the closing direction spring force of a spring element. With lifting of the armature against the spring force of the spring element
  • the permanent magnet is flush-mounted in the outer pole or the inner pole of the magnetic core.
  • the inner and / or the outer diameter of the permanent magnet is consequently adapted to the inner and / or outer diameter of the outer pole or the inner pole of the magnetic core.
  • the recess for receiving the magnetic coil is not reduced by the integration of the permanent magnet in the magnetic core.
  • a further permanent magnet may be inserted in the bottom of the magnetic core or in the armature. The insertion of the permanent magnet in the bottom of the magnetic core or in the anchor is preferably also flush.
  • the proposed magnet assembly is part of a solenoid valve.
  • the magnet assembly is therefore used in an injection valve for indirect control of an injection valve member.
  • the one-piece or multi-part liftable armature cooperating with the magnetic coil preferably comprises a valve closing element cooperating with a valve seat of the magnetic valve.
  • the armature itself may be formed as a valve closing element, which cooperates with the valve seat of the solenoid valve. In the open position of the solenoid valve, that is, when the valve closing element is not sealingly against the valve seat, under high pressure fuel from a control chamber of the injector can be supplied to a return. As a result, the control room is relieved.
  • the falling control pressure in the control chamber which acts on the injection valve member in the closing direction, causes the injection valve member lifts from its sealing seat.
  • the injection valve opens.
  • the injection valve member is returned by the spring force of a spring in its sealing seat.
  • a high control pressure builds up again in the control chamber, which holds the injection valve member in contact with its sealing seat.
  • an injection valve for injecting fuel into the combustion chamber of an internal combustion engine is claimed with a liftable injection valve member for releasing or closing at least one injection port and a magnetic assembly according to the invention for direct or indirect actuation of the injection valve member.
  • the magnet assembly of the injection valve may be formed as a solenoid valve and serve, for example, the indirect control of the injection valve member. Alternatively, however, a direct actuation of the injection valve member may be provided.
  • a magnet needle is preferably received in the armature of the magnet assembly, which is mechanically and / or hydraulically coupled to the injection valve member.
  • a permanent magnet for polarization of a magnet assembly comprises a magnetic core, a magnetic coil accommodated in a recess of the magnetic core and a cooperating with the solenoid one or more parts, lifting armature, wherein the permanent magnet in an annular outer pole or an annular inner pole of the magnetic core is integrated.
  • the magnetic coil When the magnetic coil is energized, the basic magnetic flux of the permanent magnet causes an amplification or weakening of the magnetic force acting on the armature.
  • the proposed use is therefore preferably associated with the use of the magnet assembly in an injection valve.
  • FIG. 1 is to be taken from an already known injection valve, which comprises a magnetic assembly for direct actuation of an injection valve member 11.
  • the injection valve member 11 is received in a liftable manner in a central bore 14 of a housing part 15, wherein at least one injection opening 12 of the injection valve is releasable or closable via the lifting movement of the injection valve member 11.
  • a section of the central bore 14 serves the high pressure guide, via which the at least one injection port 12 is supplied under high pressure fuel.
  • In the bore 14 of the fuel under high pressure passes through a laterally disposed high-pressure channel 16th
  • the magnet assembly comprises a magnetic core 1, a magnetic coil 3 accommodated therein and an armature 4, which in the present case is composed of a plate-shaped component and a needle-shaped component.
  • the armature 4 is acted upon by the pressure force of a spring element 13 which is supported on the housing part 17.
  • the solenoid 3 When the solenoid 3 is energized, the armature 4 is moved in the direction of the magnet coil 3 counter to the pressure force of the spring element 13.
  • the needle-shaped component of the armature 4 which is coupled to the injection valve member 11 via a hydraulic coupler volume 18, pulls the injection valve member 11 out of its sealing seat. Since the hydraulically effective area formed on the needle-shaped component is smaller than that of the nozzle needle, a force amplification takes place during this first phase of the opening stroke of the injection valve member 11. With stop of the injection valve member 11 to a booster piston 19 which surrounds the needle-shaped component of the armature 4 and is supported during the first phase of the opening stroke on the housing part 15, there is a switch from a power gain to a 1/1 ratio. During this second phase of the opening stroke, the magnet assembly ensures sufficient lift of the injection valve member 11 to effect full seat throttling.
  • the Figures 2 and 3 is a first and a second magnetic assembly according to the invention for an injection valve refer. Both illustrated embodiments have in common that they comprise a magnetic core 1 with a recess 2 and a magnetic coil 3 received in the recess 2. Furthermore, an armature 4 belongs to the respective magnetic assembly, which is presently designed as a valve closing element 10, which cooperates with a valve seat 9.
  • the in the Figures 2 and 3 shown Magnetic assemblies thus each forms a solenoid valve. These magnet assemblies are therefore preferably used in an injection valve whose injection valve member 11 is actuated indirectly. Alternatively, each of the magnet assemblies shown can also be used in injection valves, the injection valve member 11 is controlled directly. In this case, the formation of a valve seat 9 can be dispensed with.
  • the magnetic assemblies of Figures 2 and 3 each further comprise a permanent magnet 5 for polarization of the magnet assembly. Both embodiments of a magnet assembly according to the invention differ only in relation to the respective arrangement of the permanent magnet 5 within the magnet assembly.
  • the permanent magnet 5 is arranged in an outer pole 6 of the magnetic core 1.
  • the outer pole 6 is limited together with an inner pole 7 and a bottom 8 of the magnetic core 1, the recess 2, in which the magnetic coil 3 is received.
  • the permanent magnet 5 is flush-mounted in the outer pole 6.
  • the permanent magnet 5 extends in the radial direction over the entire width of the outer pole 6.
  • the permanent magnet 5 has a smaller width than the outer pole 6.
  • the magnetic coil 3 is energized in the same direction to the polarity of the permanent magnet 5.
  • the magnetic flux of the magnetic circuit generated by the magnetic coil 3 supplements the basic magnetic flux of the permanent magnet 5.
  • the energization of the solenoid 3 is preferably lowered so far that the magnetic force is only slightly larger than the spring force of the spring element 13. This ensures that the armature 4 is securely held in the raised position.
  • the magnetic coil 3 is energized in opposite directions to the polarity of the permanent magnet 5, so that the basic magnetic flux of the permanent magnet 5 is weakened or completely compensated.
  • For closing the armature 4 ie for returning the armature 4 in the valve seat 9 is consequently the full spring force of the spring element 13 is available. This results in a fast closing and a rapid decay of closing bouncers.
  • the permanent magnet 5 in the inner pole 7 of the magnetic core 1 is arranged.
  • the mode of action is analogous to that previously associated with the FIG. 2 described mode of action. A repetition is therefore omitted.
  • the illustrated embodiments of the Figures 2 and 3 comprise a further permanent magnet 5, which is arranged in the bottom 8 of the magnetic core 1 or in the armature 4.
  • FIG. 4 shows the current or force over time during an opening or closing cycle of a designed as a solenoid valve according to the invention magnetic assembly.
  • the letter A indicates the opening phase
  • the letter B the holding phase
  • the letter C the closing phase of the solenoid valve.
  • the valve opens while it closes at the time indicated by "c”.
  • the three graphs shown represent the current waveform (middle graph), the magnetic force profile (upper graph) and the course of the force acting on the armature 4 (lower graph) during the phases of an opening and closing cycle.
  • the current supply is lowered.
  • the energization of the magnetic coil 3 can be further lowered.
  • the force acting on the armature 4 only has to ensure that the armature 4 is held in its open position.
  • the closing phase C is followed by the closing phase C, in which the energization of the magnetic coil 3 takes place in the opposite direction to the polarity of the permanent magnet 5.
  • the basic magnetic flux of the permanent magnet 5 is preferable by the magnetic force of the solenoid coil 3 constantly compensated, so that the opposing energization of the solenoid 3 assists the closing of the armature 4.
  • a magnet assembly according to the invention can be used not only in injection valves, but in all hydraulic valves. However, the benefits are particularly significant in injectors in a fuel injection system.

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

Claims (5)

  1. Module magnétique pour une soupape d'injection pour l'injection de carburant dans la chambre de combustion d'un moteur à combustion interne comprenant un organe de soupape d'injection (11) pouvant effectuer un mouvement de va-et-vient pour libérer ou fermer au moins une ouverture d'injection (12), le module magnétique comprenant, pour l'actionnement direct ou indirect de l'organe de soupape d'injection (11), un noyau magnétique (1), une bobine magnétique (3) reçue dans un évidement (2) du noyau magnétique (1) et une armature (4) coopérant avec la bobine magnétique (3), réalisée en une seule ou en plusieurs parties et pouvant effectuer un mouvement de va-et-vient, ainsi qu'au moins un aimant permanent annulaire (5) qui génère un flux magnétique de base qui, lors d'une alimentation en courant électrique de la bobine magnétique (3), provoque une amplification ou une atténuation de la force magnétique agissant sur l'armature (4), caractérisé en ce que l'aimant permanent (5) est intégré dans un pôle extérieur annulaire (6) ou un pôle intérieur annulaire (7) du noyau magnétique (1), lesquels pôles limitent dans la direction radiale l'évidement (2) de réception de la bobine magnétique (3).
  2. Module magnétique selon la revendication 1, caractérisé en ce que l'aimant permanent (5) est inséré en affleurement de surface dans le pôle extérieur (6) ou le pôle intérieur (7) du noyau magnétique (1).
  3. Module magnétique selon l'une quelconque des revendications précédentes,
    caractérisé en ce que le module magnétique fait partie d'une électrovanne et l'armature (4) coopérant avec la bobine magnétique (3), réalisée en une seule ou en plusieurs parties et pouvant effectuer un mouvement de va-et-vient comporte un élément de fermeture de soupape (10) coopérant avec un siège de soupape (9) ou est réalisée sous la forme d'un tel élément de fermeture de soupape.
  4. Soupape d'injection pour l'injection de carburant dans la chambre de combustion d'un moteur à combustion interne comprenant un organe de soupape d'injection (11) pouvant effectuer un mouvement de va-et-vient pour libérer ou fermer au moins une ouverture d'injection (12), comprenant un module magnétique selon l'une quelconque des revendications précédentes pour l'actionnement direct ou indirect de l'organe de soupape d'injection (11).
  5. Utilisation d'un aimant permanent (5) pour la polarisation d'un module magnétique comportant un noyau magnétique (1), une bobine magnétique (3) reçue dans un évidement (2) du noyau magnétique (1) et une armature (4) coopérant avec la bobine magnétique (3), réalisée en une seule ou en plusieurs parties et pouvant effectuer un mouvement de va-et-vient, l'aimant permanent (5) étant intégré dans un pôle extérieur annulaire (6) ou un pôle intérieur annulaire (7) du noyau magnétique (1), et le flux magnétique de base de l'aimant permanent (5) provoquant, lors d'une alimentation en courant électrique de la bobine magnétique (3), une amplification ou une atténuation de la force magnétique agissant sur l'armature (4).
EP20110166202 2010-06-01 2011-05-16 Composant magnétique et soupape d'injection dotée d'un composant magnétique Active EP2392815B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010029595 DE102010029595A1 (de) 2010-06-01 2010-06-01 Magnetbaugruppe sowie Einspritzventil mit einer Magnetbaugruppe

Publications (2)

Publication Number Publication Date
EP2392815A1 EP2392815A1 (fr) 2011-12-07
EP2392815B1 true EP2392815B1 (fr) 2014-11-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110166202 Active EP2392815B1 (fr) 2010-06-01 2011-05-16 Composant magnétique et soupape d'injection dotée d'un composant magnétique

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EP (1) EP2392815B1 (fr)
DE (1) DE102010029595A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012011975B4 (de) 2012-06-15 2018-09-20 Rolf Prettl Ventilanordnung und Tankmodul für ein Harnstoffeinspritzsystem
DE102015217362A1 (de) 2015-09-11 2017-03-16 Continental Automotive Gmbh Kraftstoffinjektor, Verfahren zum Ermitteln der Position eines beweglichen Ankers und Motorsteuerung
JP6683143B2 (ja) * 2016-11-14 2020-04-15 株式会社デンソー 燃料噴射装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3336011A1 (de) * 1983-10-04 1985-04-18 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnet
GB8728628D0 (en) * 1987-12-08 1988-01-13 Lucas Ind Plc Fuel injection valve
DE4024054A1 (de) * 1990-07-28 1992-01-30 Bosch Gmbh Robert Magnetsystem
US5961045A (en) * 1997-09-25 1999-10-05 Caterpillar Inc. Control valve having a solenoid with a permanent magnet for a fuel injector
DE10039076A1 (de) 2000-08-10 2002-02-21 Bosch Gmbh Robert Brennstoffeinspritzventil
DE102007050550A1 (de) * 2007-10-23 2009-04-30 Robert Bosch Gmbh Multipol-Magnetaktor
DE102008001968A1 (de) 2008-05-26 2009-12-03 Robert Bosch Gmbh Magnetgruppe für ein Magnetventil

Also Published As

Publication number Publication date
DE102010029595A1 (de) 2011-12-01
CN102360707A (zh) 2012-02-22
EP2392815A1 (fr) 2011-12-07

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