EP1703089A1 - Elektromagnetisch arbeitende Ventilstelleinrichtung in einem Brennkraftmaschine und Brennkraftmaschine mit einer solchen Ventilstelleinrichtung - Google Patents

Elektromagnetisch arbeitende Ventilstelleinrichtung in einem Brennkraftmaschine und Brennkraftmaschine mit einer solchen Ventilstelleinrichtung Download PDF

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Publication number
EP1703089A1
EP1703089A1 EP05300200A EP05300200A EP1703089A1 EP 1703089 A1 EP1703089 A1 EP 1703089A1 EP 05300200 A EP05300200 A EP 05300200A EP 05300200 A EP05300200 A EP 05300200A EP 1703089 A1 EP1703089 A1 EP 1703089A1
Authority
EP
European Patent Office
Prior art keywords
actuator
electromagnet
magnet
isthmus
field
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.)
Granted
Application number
EP05300200A
Other languages
English (en)
French (fr)
Other versions
EP1703089B1 (de
Inventor
Michel Lecrivain
Mohamed Gabsi
Hamid Ben Ahmed
Emmanuel Sedda
Christophe Fageon
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.)
Centre National de la Recherche Scientifique CNRS
PSA Automobiles SA
Original Assignee
Centre National de la Recherche Scientifique CNRS
Peugeot Citroen Automobiles SA
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 Centre National de la Recherche Scientifique CNRS, Peugeot Citroen Automobiles SA filed Critical Centre National de la Recherche Scientifique CNRS
Priority to AT05300200T priority Critical patent/ATE535682T1/de
Priority to ES05300200T priority patent/ES2373396T3/es
Priority to EP05300200A priority patent/EP1703089B1/de
Publication of EP1703089A1 publication Critical patent/EP1703089A1/de
Application granted granted Critical
Publication of EP1703089B1 publication Critical patent/EP1703089B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • 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
    • 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
    • H01F7/081—Magnetic constructions

Definitions

  • the present invention relates to an electromechanical valve actuator for an internal combustion engine and to an internal combustion engine provided with such an actuator.
  • An electromechanical actuator 100 (FIG. 1) of valve 110 comprises mechanical means, such as springs 102 and 104, and electromagnetic means, such as electromagnets 106 and 108, for controlling the position of valve 110 by means of electrical signals. .
  • the tail of the valve 110 is applied against the rod 112 of a magnetic plate 114 located between the two electromagnets 106 and 108.
  • the simultaneous displacement of the rod 112 allows the spring 102 to place the valve 110 in the closed position, the head of the valve 110 coming against its seat 111 and preventing the exchange of gas between the inside and the outside of the cylinder 117.
  • valve 110 alternates open or closed positions, said switched, with transient movements between these two positions. Thereafter, the term "switched state" the state of an open or closed valve.
  • the actuator 100 may be provided with magnets 118, located in the electromagnet 108, and 116, located in the electromagnet 106, for reducing the energy required to maintain the plate 114 in a switched position.
  • each magnet is located between two sub-elements of the electromagnet with which it is associated so that its magnetic field, possibly combined with the field created by the electromagnet, reinforces the holding in the open or closed position of the valve 110.
  • the magnet 116 is located between two sub-elements 106 a and 106 b
  • said magnet magnet or polarized electromagnet requires substantially less energy to control a valve, maintaining a valve in a switched position representing a significant power consumption for the actuator.
  • the present invention results from the observation that in such a known polarized actuator, the magnetic flux of the electromagnet passes through the magnet (s) associated with it, which causes an increase in the equivalent air gap considered by this electromagnet during its action on the board. Therefore, a higher current, and thus a higher consumption, is required for the actuator to control the valve.
  • the present invention aims to solve this problem. It relates to an electromechanical actuator controlling a valve of an internal combustion engine by means of a first magnetic field, generated in a variable manner by an electromagnet, and a second magnetic field, generated by at least one magnet associated with the electromagnet, characterized in that the actuator comprises at least one isthmus forming a magnetic circuit promoting the passage of the flux generated by the coil for part of the field generated by the magnet, this isthmus being magnetically saturated by this partial field of the magnet.
  • the magnetic field of the electromagnet flows through the isthmus of the actuator when the plate is attracted or maintained by the actuator so that the effectiveness of the action of the electromagnet on the plate is not diminished by the presence of a magnet.
  • the magnetic field of the electromagnet only partially traverses the magnet associated with it during this operation of the actuator (attraction and holding of the plate) so that the magnet is not likely to be demagnetized.
  • an actuator according to the invention has a fixed magnetic circuit at the level of the electromagnet which is constituted in one piece, which provides a good mechanical rigidity and ease of assembly increased for the actuator.
  • the electromagnet having an E-shape at least one magnet is located in one of the branches of this electromagnet, for example one of the two extreme branches.
  • At least one magnet is located in each of the branches of the actuator.
  • the axis coinciding with the section of the magnet is inclined relative to the axis of the electromagnet E-shaped.
  • the extreme branches have a double section of the central branch.
  • the electromagnet when the electromagnet generates a magnetic field intended to move a movable magnetic plate vis-à-vis the actuator, this partially demagnifying the associated magnet field.
  • the isthmus when the electromagnet generates a magnetic field intended to attract and / or maintain a movable magnetic plate vis-à-vis the actuator, the isthmus forms a magnetic circuit for this field of the electromagnet.
  • the actuator comprises a plurality of magnets symmetrically disposed in the actuator, for example above the coil of the electromagnet.
  • the actuator comprises a plurality of isthmals.
  • the actuator comprises at least one isthmus between the coil of the electromagnet and each magnet.
  • the invention also relates to a motor provided with an electromechanical actuator controlling a valve of an internal combustion engine by means of a first magnetic field, generated in a variable manner by an electromagnet, and a second magnetic field, generated by a magnet associated with the electromagnet, characterized in that the actuator, comprising an isthmus such that it forms a magnetic circuit for a part of the field generated by the magnet, this isthmus being magnetically saturated by this partial field of the magnet, is in accordance with one of the previous embodiments.
  • the invention relates to a vehicle having an electromechanical actuator controlling a valve of an internal combustion engine by means of a first magnetic field, generated in a variable manner by an electromagnet, and a second magnetic field, generated by a magnet associated with the electromagnet, characterized in that the actuator, comprising an isthmus such that it forms a magnetic circuit for a part of the field generated by the magnet, this isthmus being magnetically saturated by this partial field of the magnet. magnet, is consistent with one of the previous achievements.
  • FIG. 1, already described, represents a known polarized actuator
  • FIGS. 2a, 2b, 3a, 3b and 4 represent actuators according to the invention provided with an isthmus for each magnet included in these actuators,
  • FIG. 5 shows the differences in efficiency between an actuator according to the invention and an actuator according to the prior art
  • FIGS. 6a, 6b and 7 represent actuators according to the invention provided with two magnet isthmuses included in these actuators, and
  • Figures 8a, 8b and 8c show actuators according to the invention having a concentration of the magnetic flux of each magnet.
  • FIG. 2a shows an E-shaped actuator 200 provided with magnets 202, generating a Haim magnetic field, and an electromagnet 204 generating a Héle magnetic field for attracting and possibly holding the plate 206 against this actuator. 200.
  • the actuator comprises an isthmus 201 forming a magnetic circuit for part of the Haim field generated by a magnet 202, this isthmus being magnetically saturated by this partial field of the magnet when the actuator generates no flux .
  • the Héle field generated by the electromagnet 200 is opposite to the direction of the field of the magnet in this isthmus.
  • the action of the fields of the magnets 202 and the electromagnet 204 combines at the level of the plate 206, ensuring an intense action on the latter, while these fields are in opposite directions at the level of the isthmus. 201 in which flows the field flow Héle of the electromagnet.
  • the magnet 202 is only partially traversed by this flux of the field Héle electromagnet so that it is not likely to be demagnetized.
  • the electromagnet 204 When the plate 206 is released by an actuator 250 (FIG. 2b) in accordance with the invention, the electromagnet 204 generates a field H 'in which is opposite to the field Hle used to attract or hold the plate 206.
  • the Hole field of the electromagnet 204 is opposite to the Haim field of the magnets 202 at the plate 206, the action of the electromagnet opposing the action of the magnet vis-à- screw of the plate 206.
  • the Héle fields of the electromagnet 204 and Haim of the magnets are of the same direction so that, the isthmus 201 being saturated, the Héle field of the electromagnet 204 partially crosses. the magnets 202.
  • the height x of such an isthmus 201 results from a compromise between obtaining the magnetic flux of the magnet required in the plate, for example to ensure the maintenance of the latter in switched position, which requires low values of height x of isthmus, and the improvement of the mechanical rigidity of the electromagnet as well as the improvement of the action of this electromagnet on the plateau, favored by high values of the height x of the isthmus.
  • actuator 200 described in Figure 2a differs from the actuator 250 described in Figure 2b in that the coil of the electromagnet 204 is located below ( Figure 2a) or above ( Figure 2b) magnets 202.
  • FIGS. 3a and 3b show actuators 300 and 350 which differ from one another only in the arrangement of the coils of the electromagnet 304 considered below or respectively above the magnets 302. associated with this electromagnet.
  • these embodiments differ from the embodiments described in FIGS. 2a and 2b in that the magnets 302 used have thicknesses e reduced compared to the coil of the electromagnet 304, unlike the embodiments described in FIGS. 2a and 2b where the magnets 202 and the coil had an equal thickness.
  • isthmuss 301 of a height of the order of 2 mm have given satisfactory results.
  • FIG. 4 shows another embodiment of the invention such that an isthmus 401 is associated with each magnet 402 of the actuator 400, as previously described in FIGS. 2a, 2b, 3a and 3b.
  • the actuator 400 has the isthmuss 401 between the coil of the electromagnet 404 and the magnets 402 of the actuator.
  • FIG. 5 shows a diagram comparing the forces exerted by polarized actuators or equipped with an isthmus (curve C ist ) in accordance with the invention or without an isthmus (curve C aa ) according to the prior art.
  • This diagram comprises an ordinate axis 500 indicating the force (in Newton) exerted by a given actuator as a function of the current flowing through the coils of the electromagnets of these actuators, indicated along the axis of abscissa 502 in Amperes / turn.
  • isthmus (s) in the actuator allows the latter to have a more effective electromagnet to enhance the magnetic flux of the magnets given the absence of equivalent gap formed by the magnet vis-à-vis -vis the magnetic flux of the electromagnet that circulates in the isthmus.
  • FIGS. 6a and 6b are shown other actuators 600 and 650 according to the invention such that two isthms 601 and 603 are respectively located above the magnets 602 and between these magnets 602 and the electromagnet coil. 604 considered, this embodiment having the advantage of confining the magnets and to promote the mechanical rigidity of the actuator.
  • the isthms have a height x / 2 half less than the height x of the isthms in the previous embodiments where a single isthmus is associated with each magnet.
  • Figure 6b is shown an advantageous embodiment of an actuator 650 for two isthmuses by magnet, using magnets 652 has low thickness e, and in particular has a thickness e less than the thickness of the coil of the electromagnet 654 .
  • the ratios between the section Sa of the magnet and the thicknesses (e and 2e) of the branches of the ferromagnetic circuit are such that they concentrate the flux of the magnetic field at the plateau to increase its action.
  • the thickness epp of the magnetic plate 656 is equivalent to the thickness e of the extreme branches of the actuator, while the height x / 2 of the isthms is equal at half the height x of the isthmus when a single isthmus is associated with a magnet.
  • FIG. 7 is shown an actuator 700 comprising four magnets 702 disposed in the actuator so that they form three isthmals 701, 703 and 705.
  • Such a configuration has the advantage of increased mechanical strength.
  • magnets 802 (FIG. 8a, 8b or 8c) inclined with respect to the associated electromagnets in order to increase the section Sa of the magnet at height Ha of the fixed actuator, as described in FIG. detail below.
  • the actuator 800 comprises a magnetic circuit of constant section using the magnetic plate 806, with a section epp substantially equal to the ep section of the extreme branches of the E-actuator and to the half of the ep / 2 section of the central branch of this actuator, which causes a concentration of the magnetic flux and therefore an increase in the force exerted by the electromagnet 804 on the plate 806.
  • the section Sa of the magnets 802 may be greater than the height Ha available to house the magnets in the electromagnet, this height Ha being equal to the height H of the electromagnet reduced by the height Hb of the coils. the electromagnet 804.
  • this embodiment makes it possible to increase the action of the magnet on the plate in parallel, and thus to reduce the current consumption required for the electromagnet to act on the latter. .
  • FIGS. 8b and 8c show other variants of actuators 850 and 875 whose magnets 802 are also inclined with respect to respective electromagnets.
  • the magnets are located in the extreme branches of the electromagnets so that these magnets 802 have a height H equal to the height of the electromagnet to be housed in the latter.
  • the height of the coils of the electromagnet 804 is no longer limiting with respect to the section Sa of the magnets.
  • magnets 802 no longer has any constraints with respect to the possible height of the coil of the electromagnets 804.
  • the electromagnet 850 or 875 have different properties.
  • the arrangement (FIG. 8b) of the magnets 802 such that the end 803 of the magnets 802 which is close to the plate 806 is also the end of this magnet 802 which is remote from the coil 804 has the advantage of implementing a tray of shorter dimensions than when (FIG. 8c) the end 803 of the magnets 802, which is close to the plate 806, is also the end closest to the coil 804.
  • FIGS. 8a, 8b and 8c have the advantage of ensuring that the magnets 802 are properly held since the latter are disposed inside the actuator.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP05300200A 2005-03-18 2005-03-18 Elektromagnetisch arbeitende Ventilstelleinrichtung in einem Brennkraftmaschine und Brennkraftmaschine mit einer solchen Ventilstelleinrichtung Not-in-force EP1703089B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT05300200T ATE535682T1 (de) 2005-03-18 2005-03-18 Elektromagnetisch arbeitende ventilstelleinrichtung in einem brennkraftmaschine und brennkraftmaschine mit einer solchen ventilstelleinrichtung
ES05300200T ES2373396T3 (es) 2005-03-18 2005-03-18 Accionador electromecánico de mando de válvula para motor de combustión interna y motor de combustión interna provisto de un acicionador de este tipo.
EP05300200A EP1703089B1 (de) 2005-03-18 2005-03-18 Elektromagnetisch arbeitende Ventilstelleinrichtung in einem Brennkraftmaschine und Brennkraftmaschine mit einer solchen Ventilstelleinrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05300200A EP1703089B1 (de) 2005-03-18 2005-03-18 Elektromagnetisch arbeitende Ventilstelleinrichtung in einem Brennkraftmaschine und Brennkraftmaschine mit einer solchen Ventilstelleinrichtung

Publications (2)

Publication Number Publication Date
EP1703089A1 true EP1703089A1 (de) 2006-09-20
EP1703089B1 EP1703089B1 (de) 2011-11-30

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Application Number Title Priority Date Filing Date
EP05300200A Not-in-force EP1703089B1 (de) 2005-03-18 2005-03-18 Elektromagnetisch arbeitende Ventilstelleinrichtung in einem Brennkraftmaschine und Brennkraftmaschine mit einer solchen Ventilstelleinrichtung

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EP (1) EP1703089B1 (de)
AT (1) ATE535682T1 (de)
ES (1) ES2373396T3 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1047028A (ja) * 1996-07-31 1998-02-17 Suzuki Motor Corp 電磁弁型エンジンの制御装置
JP2002130510A (ja) * 2000-10-18 2002-05-09 Toyota Motor Corp 電磁駆動弁
US6763789B1 (en) 2003-04-01 2004-07-20 Ford Global Technologies, Llc Electromagnetic actuator with permanent magnet
FR2865238A1 (fr) * 2004-01-15 2005-07-22 Peugeot Citroen Automobiles Sa Actionneur electromecanique de commande de soupape pour moteur a combustion interne et moteur a combustion interne muni d'un tel actionneur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1047028A (ja) * 1996-07-31 1998-02-17 Suzuki Motor Corp 電磁弁型エンジンの制御装置
JP2002130510A (ja) * 2000-10-18 2002-05-09 Toyota Motor Corp 電磁駆動弁
US6763789B1 (en) 2003-04-01 2004-07-20 Ford Global Technologies, Llc Electromagnetic actuator with permanent magnet
FR2865238A1 (fr) * 2004-01-15 2005-07-22 Peugeot Citroen Automobiles Sa Actionneur electromecanique de commande de soupape pour moteur a combustion interne et moteur a combustion interne muni d'un tel actionneur

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 06 30 April 1998 (1998-04-30) *
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 09 4 September 2002 (2002-09-04) *

Also Published As

Publication number Publication date
EP1703089B1 (de) 2011-11-30
ATE535682T1 (de) 2011-12-15
ES2373396T3 (es) 2012-02-03

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