EP2455603A1 - Ensemble de soupape pour soupape d'injection et soupape d'injection - Google Patents

Ensemble de soupape pour soupape d'injection et soupape d'injection Download PDF

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Publication number
EP2455603A1
EP2455603A1 EP10191472A EP10191472A EP2455603A1 EP 2455603 A1 EP2455603 A1 EP 2455603A1 EP 10191472 A EP10191472 A EP 10191472A EP 10191472 A EP10191472 A EP 10191472A EP 2455603 A1 EP2455603 A1 EP 2455603A1
Authority
EP
European Patent Office
Prior art keywords
armature
valve
permanent magnet
valve assembly
pole piece
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.)
Withdrawn
Application number
EP10191472A
Other languages
German (de)
English (en)
Inventor
Mauro Grandi
Enio Biasci
Marco Lunghi
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP10191472A priority Critical patent/EP2455603A1/fr
Publication of EP2455603A1 publication Critical patent/EP2455603A1/fr
Withdrawn legal-status Critical Current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
    • 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 valve assembly for an injection valve and an injection valve.
  • the vale assembly comprises a permanent magnet.
  • Injection valves are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • the object of the invention is to provide a valve assembly and an injection valve which facilitate a reliable and precise function of the injection valve.
  • the invention is distinguished by a valve assembly for an injection valve.
  • the valve assembly comprises a valve body including a central longitudinal axis, wherein the valve body comprises a cavity. Furthermore the valve assembly comprises a valve needle axially moveable in the cavity and preventing a fluid flow out of an injection nozzle in a closing position and enabling the fluid flow out of the injection nozzle apart from the closing position.
  • the valve assembly comprises an electro-magnetic actuator unit being designed to actuate the valve needle.
  • the electro-magnetic actuator unit comprises a coil and a core, wherein the core comprises at least a pole piece.
  • the actuator unit comprises an armature axially moveable in the cavity between a first position and a second position. In the case the armature is in the first position, the armature and the pole piece abut. In the case the armature is in the second position, there is a given maximum gap between the pole piece and the armature.
  • the valve assembly comprises a permanent magnet axially extending at least partly along the extension of the maximum gap, wherein the permanent magnet is arranged radially outwards relative to the armature.
  • the armature In the case the armature is in the first position it may be possible that the armature and the pole piece abut, in particular in the sense that there may be at least partly a minimal gap.
  • the given maximum gap depends, for instance, on a detailed design of the valve assembly and its elements, e. g. like a calibration spring and/or a damping spring and/or an upper guide.
  • the core may be mainly formed by a pole piece which for instance is at least a part of an inlet tube. But there may be additional or other elements guiding and/or amplifying a magnetic field induced by the coil and therefore may be assigned to the core, like a housing and/or a valve body.
  • the armature, the coil and the core of the actuator unit and, for instance, the other elements guiding and/or amplifying the magnetic field induced by the coil form an electro-magnetic circuit.
  • An electrical behaviour of this electro-magnetic circuit can be characterized by an actuator unit voltage.
  • the actuator unit may be activated by a predetermined activation signal during a given activation period.
  • the magnetic field induced by the coil is controlled by the activation signal.
  • the armature is directly controlled by the activation signal during the activation period.
  • this force coupling is interrupted and there is a transient phase.
  • the armature and other with the armature mechanically coupled components move themselves depending upon their inertia and/or a mechanic condition and/or a hydraulic condition to close the injector.
  • the permanent magnet may effect that during said transient phase an additional magnetic flux generated by a closing movement of the armature is not by-passed by the valve body but the energy is transformed and causes a current in the electro-magnetic circuit.
  • This discharging current impacts a characteristic of the actuator unit voltage during said transient phase.
  • This actuator unit voltage characteristic may advantageously be used to determine a closing time, representing a time when the valve needle effectively reaches the closing position.
  • the permanent magnet axially extends at least along the extension of the maximum gap.
  • the permanent magnet is magnetized in an axial direction.
  • the actuator unit may advantageously be activated by the activation signal at least during an opening phase, during which the valve needle moves out of its closing position, in that way that a magnetic flux of the coil induced into an inner part of the coil, i. e. in particular into the pole piece and/or armature, and a magnetic flux induced by the permanent magnet in particular into the armature and/or pole piece extend in approximately opposite direction.
  • the permanent magnet is formed as a circular tube section. This supports an economical manufacturing of the valve assembly.
  • the permanent magnet is arranged between the valve body and the housing. This also supports an economical manufacturing of the valve assembly.
  • the permanent magnet is arranged inside the valve body.
  • the invention is distinguished by an injection valve with a valve assembly in accordance with the first aspect.
  • An injection valve 100 ( figure 1 ), that is particular suitable for dosing fuel into an internal combustion engine, comprises e. g. a valve assembly 11 and an inlet tube 15.
  • the valve assembly 11 comprises a valve body 14 with a central longitudinal axis L and a housing 16.
  • the housing 16 is partially arranged around the valve body 14. Furthermore a cavity 18 is arranged in the valve body 14.
  • the cavity 18 takes in a valve needle 20, an armature 22 and in this particular case a damper element, e. g. a damper spring 46.
  • the damper spring 46 forms a soft stop element for the armature 22.
  • the armature 22 has an upper guide 24 formed as a circular tube section around the valve needle 20. The upper guide 24 is mechanically coupled with the valve needle 20.
  • a calibration spring 28 is arranged in a recess 26 provided in the inlet tube 15.
  • the valve needle 20 comprises, for example, a valve needle body and a sealing element.
  • the sealing element is mechanically coupled with the valve needle body.
  • the valve needle body preferably has a cylindrical shape.
  • the sealing element has for example a spherical shape. Alternatively, the sealing element can have a conical shape.
  • the sealing element rests on a seat preventing a fluid flow through at least one injection nozzle of the injection valve 100.
  • the injection nozzle may be, for example, an injection hole. However, it may also be of some other type suitable for dosing fluid.
  • the sealing element permits the fluid injection into the combustion chamber in further positions, i. e. when it does not rest on the seat. The further positions represent non-closing positions.
  • the valve assembly 11 is provided with an actuator unit 36 which is preferably an electro-magnetic actuator.
  • the actuator unit 36 comprises, for example, an armature 22, a core and a coil 38, which is preferably arranged inside the housing 16 and overmolded.
  • the coil 38 and the core form an electromagnet.
  • the core is mainly formed by a pole piece 12, which is for instance a part of the inlet tube 15.
  • the housing 16 and the valve body 14 are affected by a magnetic field induced by the activated coil 38 and therefore may be assigned to the core.
  • the armature 22 is axially moveable in the cavity 18 between a first position and a second position.
  • a first armature surface area 23 and a pole piece surface area 13 facing each other may abut in particular in the sense that there may be a minimal gap between these surfaces 23, 13.
  • valve assembly 11 may comprise a permanent magnet 48 extending at least partly along the extension of the maximum gap, wherein the permanent magnet 48 is arranged radially outwards relative to the armature 22.
  • the permanent magnet 48 of the valve assembly 11 comprises an axially total extension exceeding the extension of the maximum gap in both axial directions, in particular with approximately one-third of the total extension in axial direction towards the inlet tube 15 and with approximately 20% of the total extension in axial direction towards the damper spring 46.
  • the permanent magnet 48 may be formed as a circular tube section.
  • the circular tube section may be made in one piece, but it is also possible that the circular tube section is formed by more the one piece.
  • the permanent magnet 48 is arranged between the valve body 14 and the housing 16. Alternatively or additionally the permanent magnet 48 may be arranged inside the valve body 14.
  • the permanent magnet 48 is preferably magnetized in an axial direction.
  • Figure 2b exemplarily shows magnetic flux lines of the permanent magnet 48.
  • the electromagnet may effect, depending on the activation signal, an electro-magnetic force on the armature 22.
  • the armature 22 may be attracted by the electromagnet and moves in the direction of the longitudinal axis L away from a fluid outlet portion of the cavity 18.
  • the armature 22 pushes on the upper guide 24 which is mechanically coupled with the valve needle 20 and therefore the valve needle 20 moves in axial direction out of the closing position.
  • Figure 2a shows magnetic flux lines of the coil 38.
  • the actuator unit 36 may advantageously be activated by the activation signal at least during an opening phase, during which the valve needle 20 moves out of its closing position, in that way the magnetic flux induced by the coil 38 and the magnetic flux induced by the permanent magnet 48 in particular into the armature 22 and/or pole piece 12 extend in approximately opposite direction.
  • the actuator unit 36 and the other elements guiding and/or amplifying the magnetic field induced by the coil 38 form an electro-magnetic circuit.
  • An electrical behaviour of this electro-magnetic circuit can be characterized by an actuator unit voltage.
  • the actuator unit voltage can be measured by a voltage sensor.
  • a variation of the armature dynamic, which happens in a moment the valve needle 20 reaches the closing position, can be detected depending on the actuator unit voltage characteristic.
  • the force coupling between the electromagnet and the armature 22 is interrupted and there is a transient phase because some energy is still stored in the electro-magnetic circuit.
  • the valve needle 20 moves in its closing position. In this case, for instance, the armature 22 moves into the second position.
  • the motion of the armature 22 has an impact on the electrical behaviour of the electro-magnetic circuit and therefore on the actuator unit voltage during the transient phase.
  • the armature 22 has a different dynamic behaviour and so a different impact on the actuator unit voltage.
  • the permanent magnet flux prevents that the flux generated by the armature movement enters into the valve body 14 and therefore the flux generated by the armature movement is passed into the housing 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
EP10191472A 2010-11-17 2010-11-17 Ensemble de soupape pour soupape d'injection et soupape d'injection Withdrawn EP2455603A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10191472A EP2455603A1 (fr) 2010-11-17 2010-11-17 Ensemble de soupape pour soupape d'injection et soupape d'injection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10191472A EP2455603A1 (fr) 2010-11-17 2010-11-17 Ensemble de soupape pour soupape d'injection et soupape d'injection

Publications (1)

Publication Number Publication Date
EP2455603A1 true EP2455603A1 (fr) 2012-05-23

Family

ID=43797890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10191472A Withdrawn EP2455603A1 (fr) 2010-11-17 2010-11-17 Ensemble de soupape pour soupape d'injection et soupape d'injection

Country Status (1)

Country Link
EP (1) EP2455603A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017041925A1 (fr) * 2015-09-11 2017-03-16 Continental Automotive Gmbh Injecteur de carburant, procédé de détermination de la position d'un induit mobile et commande de moteur

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002012713A1 (fr) * 2000-08-10 2002-02-14 Robert Bosch Gmbh Soupape d'injection de carburant
DE102006061946A1 (de) * 2006-12-29 2008-07-03 Robert Bosch Gmbh Brennstoffeinspritzventil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002012713A1 (fr) * 2000-08-10 2002-02-14 Robert Bosch Gmbh Soupape d'injection de carburant
DE102006061946A1 (de) * 2006-12-29 2008-07-03 Robert Bosch Gmbh Brennstoffeinspritzventil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017041925A1 (fr) * 2015-09-11 2017-03-16 Continental Automotive Gmbh Injecteur de carburant, procédé de détermination de la position d'un induit mobile et commande de moteur
KR20180041160A (ko) * 2015-09-11 2018-04-23 콘티넨탈 오토모티브 게엠베하 연료 분사기, 이동식 전기자의 위치를 확인하기 위한 방법 및 모터 제어
CN108026883A (zh) * 2015-09-11 2018-05-11 大陆汽车有限公司 燃料喷射器、用于确定可移动电枢的位置的方法以及发动机控制器
US10920728B2 (en) 2015-09-11 2021-02-16 Vitesco Technologies GmbH Fuel injector, method for ascertaining the position of a movable armature, and motor control

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