EP1703089B1 - Electromagnetic valve actuator for an internal combustion engine, and engine with such an actuator - Google Patents

Electromagnetic valve actuator for an internal combustion engine, and engine with such an actuator Download PDF

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Publication number
EP1703089B1
EP1703089B1 EP05300200A EP05300200A EP1703089B1 EP 1703089 B1 EP1703089 B1 EP 1703089B1 EP 05300200 A EP05300200 A EP 05300200A EP 05300200 A EP05300200 A EP 05300200A EP 1703089 B1 EP1703089 B1 EP 1703089B1
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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.)
Not-in-force
Application number
EP05300200A
Other languages
German (de)
French (fr)
Other versions
EP1703089A1 (en
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
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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 ES05300200T priority Critical patent/ES2373396T3/en
Priority to AT05300200T priority patent/ATE535682T1/en
Priority to EP05300200A priority patent/EP1703089B1/en
Publication of EP1703089A1 publication Critical patent/EP1703089A1/en
Application granted granted Critical
Publication of EP1703089B1 publication Critical patent/EP1703089B1/en
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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 ( figure 1 ) valve 110 includes mechanical means, such as springs 102 and 104, and electromagnetic means, such as electromagnets 106 and 108, for controlling the position of the valve 110 by means of electrical signals.
  • mechanical means such as springs 102 and 104
  • electromagnetic means such as electromagnets 106 and 108
  • 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 state will be called the state of a valve open or closed.
  • 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 half 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.
  • the figure 1 already described, represents a known polarized actuator
  • Figures 2a, 2b , 3a, 3b and 4 represent known actuators provided with an isthmus for each magnet included in these actuators,
  • the figure 5 represents the differences in efficiency between an actuator according to the invention and an actuator according to the prior art
  • FIGS. 8a, 8b and 8c represent actuators according to the invention having a concentration of the magnetic flux of each magnet.
  • 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 204 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 ( figure 2b ) according to the invention, the electromagnet 204 generates a field H'ele opposite direction to the field Héle used to attract or maintain 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.
  • the actuator 200 described in figure 2a differs from the actuator 250 described in figure 2b in that the coil of electromagnet 204 is located below ( figure 2a ) or above ( figure 2b ) magnets 202.
  • actuators 300 and 350 which differ from each other only by the arrangement of the coils of the electromagnet 304 considered below or respectively above the magnets 302 associated with this electromagnet.
  • these achievements differ from the achievements described in Figures 2a and 2b in that the magnets 302 used have thicknesses e reduced with respect to the coil of the electromagnet 304, unlike the embodiments described in FIGS. Figures 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.
  • FIGS. Figures 2a, 2b , 3a and 3b another embodiment is shown such that an isthmus 401 is associated with each magnet 402 of the actuator 400, as previously described in FIGS. Figures 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 On the figure 5 is shown a diagram comparing the forces exerted by polarized actuators is provided with an isthmus (Curve C ist ) according to the invention or lack of 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.
  • actuators 600 and 650 such that two isthms 601 and 603 are located, respectively, above the magnets 602 and between these magnets 602 and the coil of the electromagnet 604 considered, this embodiment having the advantage of confining magnets and 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.
  • an actuator 650 with two isthmens per magnet using magnets 652 thin e a , and in particular of thickness e is 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.
  • 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 ( Figure 8a, 8b or 8c ) inclined relative to the associated electromagnets to increase the section Sa of the magnet at height Ha of the fixed actuator, as described in detail below.
  • the actuator 800 comprises a magnetic circuit of constant section using the magnetic plate 806, epp section substantially equal to the ep section of the extreme branches of the actuator E and half of the section ep / 2 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. .
  • 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 actuators 850 or 875 have different properties.
  • the provision ( figure 8b ) 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 shorter plate size than when ( figure 8c ) the end 803 of the magnets 802, which is close to the plate 806, is also the end closest to the coil 804.

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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)

Abstract

The actuator has an isthmus (201) forming a magnetic circuit to form a passage for magnetic flux generated by an electromagnet (204) for a part of a field generated by a magnet (202), when the electromagnet generates a magnetic field to attract and/or maintain a movable magnetic plate (206) opposite to the actuator. The isthmus is magnetically saturated by the partial magnetic field of the magnet. An independent claim is also included for a vehicle comprising an electro mechanic actuator controlling a valve of an internal combustion engine.

Description

La présente invention se rapporte à un actionneur électromécanique de commande de soupape pour moteur à combustion interne et à un moteur à combustion interne muni d'un tel actionneur.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.

Un actionneur, connu dans l'état de la technique et conforme au préambule de la revendication 1 est notamment divulgué par le document US 6 763 789 .An actuator, known in the state of the art and in accordance with the preamble of claim 1, is notably disclosed by the document US 6,763,789 .

Un actionneur 100 électromécanique (figure 1) de soupape 110 comporte des moyens mécaniques, tels que des ressorts 102 et 104, et des moyens électromagnétiques, tels que des électroaimants 106 et 108, pour commander la position de la soupape 110 au moyen de signaux électriques. A cet effet la queue de la soupape 110 est appliquée contre la tige 112 d'un plateau magnétique 114 situé entre les deux électroaimants 106 et 108.An electromechanical actuator 100 ( figure 1 ) valve 110 includes mechanical means, such as springs 102 and 104, and electromagnetic means, such as electromagnets 106 and 108, for controlling the position of the valve 110 by means of electrical signals. For this purpose 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.

Lorsqu'un courant circule dans la bobine 109 de l'électroaimant 108, ce dernier est activé et génère un champ magnétique attirant le plateau 114 qui vient à son contact.When a current flows in the coil 109 of the electromagnet 108, the latter is activated and generates a magnetic field attracting the plate 114 which comes into contact with it.

Le déplacement simultané de la tige 112 permet au ressort 102 de placer la soupape 110 en position fermée, la tête de la soupape 110 venant contre son siège 111 et empêchant les échanges de gaz entre l'intérieur et l'extérieur du cylindre 117.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.

De façon analogue (non représentée), lorsqu'un courant circule dans la bobine 107 de l'électroaimant 106, l'électroaimant 108 étant désactivé, ce dernier est activé et attire le plateau 114 qui vient à son contact et déplace la tige 112, à l'aide du ressort 104, de telle sorte que cette tige 112 agit sur la soupape 110 et place cette dernière en position ouverte, la tête de la soupape étant éloignée de son siège 111 pour permettre, par exemple, une admission ou une injection de gaz dans le cylindre 117.In a similar way (not shown), when a current flows in the coil 107 of the electromagnet 106, the electromagnet 108 being deactivated, the latter is activated and attracts the plate 114 which comes into contact with it and moves the rod 112, using the spring 104, so that the rod 112 acts on the valve 110 and places it in the open position, the valve head being away from its seat 111 to allow, for example, an admission or injection of gas in the cylinder 117.

Ainsi, la soupape 110 alterne des positions ouvertes ou fermées, dites commutées, avec des déplacements transitoires entre ces deux positions. Par la suite, on dénommera état commuté l'état d'une soupape ouverte ou fermée.Thus, the valve 110 alternates open or closed positions, said switched, with transient movements between these two positions. Thereafter, the state will be called the state of a valve open or closed.

Par ailleurs, l'actionneur 100 peut être muni d'aimants 118, situé dans l'électroaimant 108, et 116, situé dans l'électroaimant 106, destinés à réduire l'énergie nécessaire au maintien du plateau 114 dans une position commutée.Furthermore, 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.

A cet effet, chaque aimant est situé entre deux sous éléments de l'électroaimant auquel il est associé de façon à ce que son champ magnétique, éventuellement combiné au champ créé par l'électroaimant, renforce le maintien en position ouverte ou fermée de la soupape 110. Par exemple, l'aimant 116 est compris entre deux sous-éléments 106a et 106b For this purpose, 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. For example, the magnet 116 is located between two sub-elements 106 a and 106 b

Grâce à l'action de l'aimant sur le plateau magnétique, un tel électroaimant 106 ou 108, dit électroaimant à aimant ou électroaimant polarisé, requiert sensiblement moins d'énergie pour contrôler une soupape, le maintien d'une soupape dans une position commutée représentant une consommation importante d'énergie pour l'actionneur.Thanks to the action of the magnet on the magnetic plate, such an electromagnet 106 or 108, 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.

La présente invention résulte de la constatation que dans un tel actionneur polarisé connu, le flux magnétique de l'électroaimant traverse le (ou les) aimant(s) qui lui est associé, ce qui provoque une augmentation de l'entrefer équivalent considéré par cet électroaimant lors de son action sur le plateau. Par conséquent, un courant plus élevé, et donc une consommation plus importante, est nécessaire à l'actionneur pour contrôler la soupape.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.

La présente invention vise à résoudre ce problème. Elle concerne un actionneur électromécanique commandant une soupape d'un moteur à combustion interne au moyen d'un premier champ magnétique, généré de façon variable par un électroaimant, et d'un second champ magnétique, généré par au moins un aimant associé à l'électroaimant, caractérisé en ce que l'actionneur comporte au moins un isthme formant un circuit magnétique favorisant le passage du flux généré par la bobine pour une partie du champ généré par l'aimant, cet isthme étant magnétiquement saturé par ce champ partiel de l'aimant.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.

Dans un tel actionneur, le champ magnétique de l'électroaimant circule par l'isthme de l'actionneur lorsque le plateau est attiré ou maintenu par l'actionneur de telle sorte que l'efficacité de l'action de l'électroaimant sur le plateau n'est pas diminuée par la présence d'un aimant.In such an actuator, 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.

De façon corollaire, le champ magnétique de l'électroaimant ne traverse que partiellement l'aimant qui lui est associé lors de ce fonctionnement de l'actionneur (attraction et maintien du plateau) de telle sorte que l'aimant ne risque pas d'être désaimanté.As a corollary, 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.

Par ailleurs, si un champ de défluxage destiné à compenser le champ de l'aimant est mis en oeuvre par l'actionneur lors du décollage du plateau, ce champ traverse l'entrefer en sens inverse à celui créé par l'aimant et diminue ainsi la force d'attraction du plateau.Moreover, if a field of defluxing intended to compensate the field of the magnet is implemented by the actuator during takeoff of the plate, this field crosses the gap in the opposite direction to that created by the magnet and thus decreases. the attraction force of the plateau.

En outre, un actionneur conforme à l'invention a un circuit magnétique fixe au niveau de l'électroaimant qui est constitué d'une seule pièce, ce qui procure une bonne rigidité mécanique et une facilité d'assemblage accrues pour l'actionneur.In addition, 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.

Dans une réalisation, l'électroaimant présentant une forme en E, au moins un aimant est situé dans une des branches de cet électroaimant, par exemple une des deux branches extrêmes.In one embodiment, 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.

Selon une réalisation, au moins un aimant est situé dans chacune des branches de l'actionneur.According to one embodiment, at least one magnet is located in each of the branches of the actuator.

D'après l'invention, l'axe confondu avec la section de l'aimant est incliné par rapport à l'axe de l'électroaimant en forme de E.According to the invention, the axis coinciding with the section of the magnet is inclined relative to the axis of the electromagnet E-shaped.

Selon une réalisation, les branches extrêmes ont une section moitié de la branche centrale.In one embodiment, the extreme branches have a half section of the central branch.

Dans une réalisation, lorsque l'électroaimant génère un champ magnétique destiné à éloigner un plateau magnétique mobile vis-à-vis de l'actionneur, ce champ désaimante partiellement l'aimant associé.In one embodiment, 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.

Selon une réalisation, lorsque l'électroaimant génère un champ magnétique destiné à attirer et/ou à maintenir un plateau magnétique mobile vis-à-vis de l'actionneur, l'isthme forme un circuit magnétique pour ce champ de l'électroaimant.According to one embodiment, 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.

Dans une réalisation, l'actionneur comprend une pluralité d'aimants disposés de façon symétrique dans l'actionneur, par exemple au dessus de la bobine de l'électroaimant.In one embodiment, the actuator comprises a plurality of magnets symmetrically disposed in the actuator, for example above the coil of the electromagnet.

Selon une réalisation, l'actionneur comprend une pluralité d'isthmes.In one embodiment, the actuator comprises a plurality of isthmals.

Dans une réalisation, l'actionneur comprend au moins un isthme entre la bobine de l'électroaimant et chaque aimant.In one embodiment, the actuator comprises at least one isthmus between the coil of the electromagnet and each magnet.

L'invention concerne aussi un moteur muni d'un actionneur électromécanique commandant une soupape d'un moteur à combustion interne au moyen d'un premier champ magnétique, généré de façon variable par un électroaimant, et d'un second champ magnétique, généré par un aimant associé à l'électroaimant, caractérisé en ce que l'actionneur, comportant un isthme tel qu'il forme un circuit magnétique pour une partie du champ généré par l'aimant, cet isthme étant magnétiquement saturé par ce champ partiel de l'aimant, est conforme à l'une des réalisations précédentes.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.

Finalement, l'invention concerne un véhicule muni d'un actionneur électromécanique commandant une soupape d'un moteur à combustion interne au moyen d'un premier champ magnétique, généré de façon variable par un électroaimant, et d'un second champ magnétique, généré par un aimant associé à l'électroaimant, caractérisé en ce que l'actionneur, comportant un isthme tel qu'il forme un circuit magnétique pour une partie du champ généré par l'aimant, cet isthme étant magnétiquement saturé par ce champ partiel de l'aimant, est conforme à l'une des réalisations précédentes.Finally, 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.

D'autres caractéristiques et avantages de l'invention apparaîtront avec la description effectuée ci-dessous, à titre illustratif et non limitatif, de réalisations préférées de l'invention à l'aide des figures ci-jointes sur lesquelles :Other features and advantages of the invention will become apparent with the description given below, by way of illustration and without limitation, of preferred embodiments of the invention with the aid of the attached figures in which:

la figure 1, déjà décrite, représente un actionneur polarisé connu,the figure 1 , already described, represents a known polarized actuator,

les figures 2a, 2b, 3a, 3b et 4 représentent des actionneurs connus munis d'un isthme pour chaque aimant compris dans ces actionneurs,the Figures 2a, 2b , 3a, 3b and 4 represent known actuators provided with an isthmus for each magnet included in these actuators,

la figure 5 représente les différences d'efficacité entre un actionneur conforme à l'invention et un actionneur selon l'art antérieur,the figure 5 represents the differences in efficiency between an actuator according to the invention and an actuator according to the prior art,

les figures 6a, 6b et 7 représentent des actionneurs connus munis de deux isthmes par aimant compris dans ces actionneurs, etthe Figures 6a, 6b and 7 represent known actuators provided with two magnet isthms included in these actuators, and

les figures 8a, 8b et 8c représentent des actionneurs conformes à l'invention présentant une concentration du flux magnétique de chaque aimant.the Figures 8a, 8b and 8c represent actuators according to the invention having a concentration of the magnetic flux of each magnet.

Sur la figure 2a est représenté un actionneur 200 en forme de E, muni d'aimants 202, générant un champ magnétique Haim, et d'un électroaimant 204 générant un champ magnétique Héle pour attirer, et éventuellement maintenir, le plateau 206 contre cet actionneur 200.On the figure 2a there is shown 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.

L'actionneur comporte un isthme 201 formant un circuit magnétique pour une partie du champ Haim généré par un aimant 202, cet isthme étant magnétiquement saturé par ce champ partiel de l'aimant lorsque l'actionneur ne génère aucun flux.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.

Toutefois, lors de l'attraction du plateau 206 par l'actionneur 200, le champ Héle généré par l'électroaimant 204 est de sens contraire au sens du champ de l'aimant dans cet isthme.However, during the attraction of the plate 206 by the actuator 200, the Héle field generated by the electromagnet 204 is opposite to the direction of the field of the magnet in this isthmus.

En d'autres termes, l'action des champs des aimants 202 et de l'électroaimant 204 se combine au niveau du plateau 206, assurant une action intense sur ce dernier, tandis que ces champs sont de sens opposés au niveau de l'isthme 201 dans lequel circule le flux du champ Héle de l'électroaimant.In other words, 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.

De ce fait, comme précédemment indiqué, l'aimant 202 n'est que partiellement traversé par ce flux du champ Héle de l'électroaimant de telle sorte qu'il ne risque pas d'être désaimanté.Therefore, as previously indicated, the magnet 202 is only partially traversed by this flux of the field Héle electromagnet so that it is not likely to be demagnetized.

Lorsque le plateau 206 est libéré par un actionneur 250 (figure 2b) conforme à l'invention, l'électroaimant 204 génère un champ H'éle de sens opposé au champ Héle utilisé pour attirer ou maintenir le plateau 206.When the plate 206 is released by an actuator 250 ( figure 2b ) according to the invention, the electromagnet 204 generates a field H'ele opposite direction to the field Héle used to attract or maintain the plate 206.

Dans ce cas, le champ H'éle de l'électroaimant 204 est opposé au champ Haim des aimants 202 au niveau du plateau 206, l'action de l'électroaimant s'opposant à l'action de l'aimant vis-à-vis du plateau 206.In this case, 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.

Au niveau de l'isthme 201, les champs H'éle de l'électroaimant 204 et Haim des aimants sont de même sens de telle sorte que, l'isthme 201 étant saturé, le champ H'éle de l'électroaimant 204 traverse partiellement les aimants 202.At the level of the isthmus 201, 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.

Une telle situation présente l'avantage, comme détaillée ultérieurement, de diminuer le champ magnétique généré par l'aimant et de favoriser ainsi la libération du plateau.Such a situation has the advantage, as detailed later, to reduce the magnetic field generated by the magnet and thus to promote the release of the plate.

Il apparaît, qu'à section Sa d'aimant donnée, la hauteur x d'un tel isthme 201 résulte d'un compromis entre l'obtention du flux magnétique de l'aimant requis dans le plateau, par exemple pour assurer le maintien de ce dernier en position commutée, ce qui nécessite des valeurs faibles d'hauteur x d'isthme, et l'amélioration de la rigidité mécanique de l'électroaimant ainsi que l'amélioration de l'action de cet électroaimant sur le plateau, favorisées par des valeurs élevées de la hauteur x de l'isthme.It appears that in section Sa of given magnet, 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.

Finalement, il convient de noter que l'actionneur 200 décrit à la figure 2a diffère de l'actionneur 250 décrit à la figure 2b en ce que la bobine de l'électroaimant 204 est située en dessous (figure 2a) ou au dessus (figure 2b) des aimants 202.Finally, it should be noted that the actuator 200 described in figure 2a differs from the actuator 250 described in figure 2b in that the coil of electromagnet 204 is located below ( figure 2a ) or above ( figure 2b ) magnets 202.

Des expériences ont montré que la configuration présentant les aimants au dessus de la bobine était préférable, en termes de consommation énergétique, à la configuration présentant les aimants en dessous de la bobine.Experiments have shown that the configuration having the magnets above the coil is preferable, in terms of energy consumption, to the configuration having the magnets below the coil.

De façon analogue, sur les figures 3a et 3b sont représentés des actionneurs 300 et 350 qui ne diffèrent l'un de l'autre que par la disposition des bobines de l'électroaimant 304 considéré en dessous, respectivement au-dessus, des aimants 302 associés à cet électroaimant.Similarly, on the Figures 3a and 3b are represented actuators 300 and 350 which differ from each other only by the arrangement of the coils of the electromagnet 304 considered below or respectively above the magnets 302 associated with this electromagnet.

Par ailleurs, ces réalisations diffèrent des réalisations décrites aux figures 2a et 2b en ce que les aimants 302 utilisés présentent des épaisseurs e réduites par rapport à la bobine de l'électroaimant 304, contrairement aux réalisations décrites aux figures 2a et 2b où les aimants 202 et la bobine avait une épaisseur égale.In addition, these achievements differ from the achievements described in Figures 2a and 2b in that the magnets 302 used have thicknesses e reduced with respect to the coil of the electromagnet 304, unlike the embodiments described in FIGS. Figures 2a and 2b where the magnets 202 and the coil had an equal thickness.

Ces épaisseurs ea réduites présentent l'avantage de permettre l'utilisation d'aimants 302 de faible coût et de permettre une rigidité plus grande pour les circuits ferromagnétiques. Des mesures ont montrées que des épaisseurs d'aimants comprises entre deux et huit millimètres étaient satisfaisantes.These thicknesses e has reduced have the advantage to allow the use 302 magnets of low cost and allow greater rigidity for ferromagnetic circuits. Measurements have shown that magnet thicknesses between two and eight millimeters are satisfactory.

Indépendamment de l'épaisseur des aimants, des isthmes 301 d'une hauteur de l'ordre de 2 mm ont donné des résultats satisfaisants.Independently of the thickness of the magnets, isthmuss 301 of a height of the order of 2 mm have given satisfactory results.

Finalement, il convient de souligner que, pour des raisons de clarté, le champ généré par l'électroaimant 304 n'est pas représenté sur les figures 3a et 3b.Finally, it should be emphasized that, for the sake of clarity, the field generated by the electromagnet 304 is not represented on the Figures 3a and 3b .

Sur la figure 4 est représenté une autre réalisation telle qu'on associe un isthme 401 à chaque aimant 402 de l'actionneur 400, comme précédemment décrit sur les figures 2a, 2b, 3a et 3b.On the figure 4 another embodiment is shown such that an isthmus 401 is associated with each magnet 402 of the actuator 400, as previously described in FIGS. Figures 2a, 2b , 3a and 3b .

Toutefois, dans ce cas, l'actionneur 400 présente les isthmes 401 entre la bobine de l'électroaimant 404 et les aimants 402 de l'actionneur.However, in this case, the actuator 400 has the isthmuss 401 between the coil of the electromagnet 404 and the magnets 402 of the actuator.

Sur la figure 5 est représenté un diagramme comparant les forces exercées par des actionneurs polarisés soit muni d'un isthme(courbe Cist) conformément à l'invention soit démuni d'un isthme (courbe Caa) selon l'art antérieur.On the figure 5 is shown a diagram comparing the forces exerted by polarized actuators is provided with an isthmus (Curve C ist ) according to the invention or lack of an isthmus (curve C aa ) according to the prior art.

Ce diagramme comprend un axe des ordonnées 500 indiquant la force (en Newton) exercée par un actionneur considéré en fonction du courant parcourant les bobines des électroaimants de ces actionneurs, indiqué selon l'axe des abscisses 502 en Ampères/tour.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.

On observe ainsi que, lorsqu'un courant positif parcourt ces bobines et que l'actionneur attire le plateau, l'actionneur conforme à l'invention (courbe Cist) exerce une force supérieure à un actionneur selon l'art antérieur (courbe Caa).It is thus observed that, when a positive current flows through these coils and the actuator attracts the plate, the actuator according to the invention (curve Cist) exerts a force greater than an actuator according to the prior art (Caa curve). .

De fait, la présence d'isthme(s) dans l'actionneur permet à ce dernier d'avoir un électroaimant plus efficace pour renforcer le flux magnétique des aimants étant donné l'absence d'entrefer équivalent formé par l'aimant vis-à-vis du flux magnétique de l'électroaimant qui circule dans l'isthme.In fact, the presence of 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.

Par ailleurs, lorsqu'un courant négatif traverse la bobine, c'est-à-dire lorsque le plateau s'éloigne de l'actionneur, la force exercée par l'actionneur comprenant un isthme diminue plus rapidement que la force exercée par un actionneur dépourvu d'isthme, ce qui réduit la consommation en énergie nécessaire à l'éloignement de la palette.On the other hand, when a negative current flows through the coil, that is to say when the plate moves away from the actuator, the force exerted by the actuator comprising an isthmus decreases more rapidly than the force exerted by an actuator. devoid of isthmus, which reduces the energy consumption necessary to move away from the pallet.

Sur les figures 6a et 6b sont représentées d'autres actionneurs 600 et 650 tels que deux isthmes 601 et 603 sont situés, respectivement, au-dessus des aimants 602 et entre ces aimants 602 et la bobine de l'électroaimant 604 considéré, cette réalisation présentant l'avantage de confiner les aimants et de favoriser la rigidité mécanique de l'actionneur.On the Figures 6a and 6b there are shown other actuators 600 and 650 such that two isthms 601 and 603 are located, respectively, above the magnets 602 and between these magnets 602 and the coil of the electromagnet 604 considered, this embodiment having the advantage of confining magnets and promote the mechanical rigidity of the actuator.

Dans cette réalisation, les isthmes ont une hauteur x/2 moitié moindre que la hauteur x des isthmes dans les réalisations précédentes où un unique isthme est associé à chaque aimant.In this realization, 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.

Sur la figure 6b est représenté un actionneur 650 à deux isthmes par aimant, utilisant des aimants 652 de faible épaisseur ea, et notamment d'épaisseur ea inférieure à l'épaisseur de la bobine de l'électroaimant 654.On the figure 6b is shown an actuator 650 with two isthmens per magnet, using magnets 652 thin e a , and in particular of thickness e is less than the thickness of the coil of the electromagnet 654.

En outre, les rapports entre la section Sa de l'aimant et les épaisseurs (e et 2e) des branches du circuit ferromagnétique sont telles qu'ils concentrent le flux du champ magnétique au niveau du plateau afin d'accroître son action.In addition, 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.

Par ailleurs, selon d'autres considérations optimisant le fonctionnement de l'actionneur, l'épaisseur epp du plateau magnétique 656 est équivalente à l'épaisseur e des branches extrêmes de l'actionneur, tandis que la hauteur x/2 des isthmes est égale à la moitié de la hauteur x des isthmes lorsqu'un seul isthme est associé à un aimant.Furthermore, according to other considerations optimizing the operation of the actuator, 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.

Sur la figure 7 est représenté un actionneur 700 comprenant quatre aimants 702 disposés dans l'actionneur de telle sorte qu'ils forment trois isthmes 701, 703 et 705. Une telle configuration présente l'avantage d'une tenue mécanique accrue.On the figure 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.

A ce stade, il convient de noter que les réalisations précédemment décrites utilisent des aimants dont les bords sont disposés parallèlement aux bords des bobines de l'actionneur.At this stage, it should be noted that the previously described embodiments use magnets whose edges are arranged parallel to the edges of the actuator coils.

D'après l'invention, il est possible d'utiliser des aimants 802 (figure 8a, 8b ou 8c) inclinés vis-à-vis des électroaimants associés afin d'augmenter la section Sa de l'aimant à hauteur Ha de l'actionneur fixé, comme décrit en détail ci-dessous.According to the invention, it is possible to use magnets 802 ( Figure 8a, 8b or 8c ) inclined relative to the associated electromagnets to increase the section Sa of the magnet at height Ha of the fixed actuator, as described in detail below.

Dans une première réalisation (figure 8a), l'actionneur 800 comprend un circuit magnétique de section constante à l'aide du plateau 806 magnétique, de section epp pratiquement égale à la section ep des branches extrêmes de l'actionneur en E et à la moitié de la section ep/2 de la branche centrale de cet actionneur, ce qui entraîne une concentration du flux magnétique et donc une augmentation de la force exercée par l'électroaimant 804 sur le plateau 806.In a first realization ( figure 8a ), the actuator 800 comprises a magnetic circuit of constant section using the magnetic plate 806, epp section substantially equal to the ep section of the extreme branches of the actuator E and half of the section ep / 2 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.

Grâce à une telle disposition, la section Sa des aimants 802 peut être supérieure à la hauteur Ha disponible pour loger les aimants dans l'électroaimant, cette hauteur Ha étant égale à la hauteur H de l'électroaimant réduite de la hauteur Hb des bobines de l'électroaimant 804.Thanks to such an arrangement, 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.

En permettant l'augmentation de la section Sa de l'aimant, cette réalisation permet d'accroître parallèlement l'action de l'aimant sur le plateau, et donc de réduire la consommation en courant nécessaire à l'électroaimant pour agir sur ce dernier.By making it possible to increase the section Sa of the magnet, 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. .

Sur les figures 8b et 8c sont représentées d'autres variantes d'actionneurs 850 et 875 dont les aimants 802 sont également inclinés par rapport aux électroaimants respectifs.On the Figures 8b and 8c there are shown other variants of actuators 850 and 875 whose magnets 802 are also inclined with respect to respective electromagnets.

Toutefois, dans ces variantes, les aimants sont situés dans les branches extrêmes des électroaimants de telle sorte que ces aimants 802 disposent d'une hauteur H égale à la hauteur de l'électroaimant pour être logés dans ce dernier.However, in these variants, 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.

En d'autres termes, la hauteur des bobines de l'électroaimant 804 n'est plus limitative vis-à-vis de la section Sa des aimants.In other words, the height of the coils of the electromagnet 804 is no longer limiting with respect to the section Sa of the magnets.

Inversement, la présence d'aimants 802 ne présente plus de contraintes vis-à-vis de la hauteur possible de la bobine des électroaimants 804.Conversely, the presence of magnets 802 no longer has any constraints with respect to the possible height of the coil of the electromagnets 804.

Il convient de noter que, en fonction de la disposition des aimants par rapport aux bobines de l'électroaimant 804, les actionneurs 850 ou 875 présentent différentes propriétés.It should be noted that, depending on the arrangement of the magnets with respect to the coils of the electromagnet 804, the actuators 850 or 875 have different properties.

Ainsi, la disposition (figure 8b) des aimants 802 telle que l'extrémité 803 des aimants 802 qui est proche du plateau 806 soit aussi l'extrémité de cet aimant 802 qui est éloignée de la bobine 804 présente l'avantage de mettre en oeuvre un plateau de plus courte dimensions que lorsque (figure 8c) l'extrémité 803 des aimants 802, qui est proche du plateau 806, est également l'extrémité la plus proche de la bobine 804.Thus, the provision ( figure 8b ) 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 shorter plate size than when ( figure 8c ) the end 803 of the magnets 802, which is close to the plate 806, is also the end closest to the coil 804.

Toutefois, il convient de noter que lorsque (figure 8c) l'extrémité 803 des aimants 802 est également l'extrémité la plus proche de la bobine 804, l'actionneur présente l'avantage de permettre l'utilisation d'aimants 802 de sections plus importante.However, it should be noted that when ( figure 8c ) the end 803 of the magnets 802 is also the end closest to the coil 804, the actuator has the advantage of allowing the use of magnets 802 of larger sections.

Par ailleurs, les réalisations décrites aux figures 8a, 8b et 8c présentent l'avantage d'assurer un bon maintien des aimants 802 puisque ces derniers sont disposés à l'intérieure de l'actionneur.In addition, the achievements described in Figures 8a, 8b and 8c have the advantage of ensuring good retention of the magnets 802 since these are arranged inside the actuator.

Claims (12)

  1. Electromechanical actuator (800, 850, 875) for controlling a valve of an internal combustion engine, said actuator comprising:
    - a plate (806) connected to a valve,
    - an electromagnet (804) which generates a first magnetic field in a variable manner, said electromagnet (804) being capable of attracting the plate,
    - at least one magnet (802) associated with the electromagnet, said magnet generating a second magnetic field,
    - at least one isthmus which is magnetically saturated by this partial field of the magnet when the electromagnet is not generating any flux,
    - the magnetic field of the electromagnet circulating across this isthmus when the plate is attracted by the electromagnet,
    characterised in that the magnet is at an inclination to the electromagnet with which it is associated.
  2. Actuator (800, 850, 875) according to claim 1, characterised in that the electromagnet (804) is E-shaped and at least one magnet (802) is located in one of the branches of this electromagnet, for example one of the two end branches.
  3. Actuator (800, 850, 875) according to claim 2, characterised in that at least one magnet (802) is located in each of the branches of the actuator.
  4. Actuator (800, 850, 875) according to either claim 2 or claim 3, characterised in that the axis coincident with the section (Sa) of the magnet (802) is at an inclination to the axis of symmetry of the E-shaped electromagnet (804).
  5. Actuator (800, 850, 875) according to any one of claims 2 to 4, characterised in that the end branches have a section (e) which is half of the central branch section (2e).
  6. Actuator (800, 850, 875) according to any one of the preceding claims, characterised in that when the electromagnet (804) generates a magnetic field intended to move a movable magnetic plate (806) away from the actuator, said field of the electromagnet partially demagnetises the magnet (802).
  7. Actuator (800, 850, 875) according to any one of the preceding claims, characterised in that when the electromagnet (804) generates a magnetic field intended to attract or hold in place a movable magnetic plate (806) in relation to the actuator, the isthmus forms a magnetic circuit for this field of the electromagnet.
  8. Actuator (800, 850, 875) according to any one of the preceding claims, characterised in that it comprises a plurality of magnets (802) in the actuator, for example above the coil of the electromagnet.
  9. Actuator (800, 850, 875) according to claim 8, characterised in that it comprises a plurality of isthmuses.
  10. Actuator (800, 850, 875) according to any one of the preceding claims, characterised in that it comprises at least one isthmus between the coil of the electromagnet and each magnet.
  11. Motor provided with an electromechanical actuator (800, 850, 875) for controlling a valve of an internal combustion engine by means of a first magnetic field, generated in a variable manner by an electromagnet (804), and a second magnetic field, generated by a magnet (802) associated with the electromagnet, characterised in that the actuator, comprising an isthmus which forms a magnetic circuit for part of the field generated by the magnet, said isthmus being magnetically saturated by the partial field of the magnet, is in accordance with one of the preceding claims.
  12. Vehicle provided with an electromechanical actuator (800, 850, 875) for controlling a valve of an internal combustion engine by means of a first magnetic field, generated in a variable manner by an electromagnet (804), and a second magnetic field, generated by a magnet (802) associated with the electromagnet, characterised in that the actuator, comprising an isthmus which forms a magnetic circuit for part of the field generated by the magnet, said isthmus being magnetically saturated by the partial field of the magnet, is in accordance with one of claims 1 to 10.
EP05300200A 2005-03-18 2005-03-18 Electromagnetic valve actuator for an internal combustion engine, and engine with such an actuator Not-in-force EP1703089B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES05300200T ES2373396T3 (en) 2005-03-18 2005-03-18 ELECTROMECHANICAL VALVE CONTROL ACTUATOR FOR INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE PROVIDED WITH AN ACTUATOR OF THIS TYPE.
AT05300200T ATE535682T1 (en) 2005-03-18 2005-03-18 ELECTROMAGNETIC VALVE ACTUATING DEVICE IN AN INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE HAVING SUCH A VALVE ACTUATING DEVICE
EP05300200A EP1703089B1 (en) 2005-03-18 2005-03-18 Electromagnetic valve actuator for an internal combustion engine, and engine with such an actuator

Applications Claiming Priority (1)

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EP05300200A EP1703089B1 (en) 2005-03-18 2005-03-18 Electromagnetic valve actuator for an internal combustion engine, and engine with such an actuator

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EP1703089A1 EP1703089A1 (en) 2006-09-20
EP1703089B1 true EP1703089B1 (en) 2011-11-30

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Publication number Priority date Publication date Assignee Title
JPH1047028A (en) * 1996-07-31 1998-02-17 Suzuki Motor Corp Controller for solenoid valve type engine
JP2002130510A (en) * 2000-10-18 2002-05-09 Toyota Motor Corp Electromagnetic drive valve
US6763789B1 (en) 2003-04-01 2004-07-20 Ford Global Technologies, Llc Electromagnetic actuator with permanent magnet
FR2865238B1 (en) * 2004-01-15 2006-06-30 Peugeot Citroen Automobiles Sa ELECTROMECHANICAL VALVE CONTROL ACTUATOR FOR INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE EQUIPPED WITH SUCH ACTUATOR

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EP1703089A1 (en) 2006-09-20
ES2373396T3 (en) 2012-02-03
ATE535682T1 (en) 2011-12-15

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