EP2212527B1 - Electromagnetic actuator with end-of-travel elastic stop - Google Patents

Electromagnetic actuator with end-of-travel elastic stop Download PDF

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Publication number
EP2212527B1
EP2212527B1 EP08872126A EP08872126A EP2212527B1 EP 2212527 B1 EP2212527 B1 EP 2212527B1 EP 08872126 A EP08872126 A EP 08872126A EP 08872126 A EP08872126 A EP 08872126A EP 2212527 B1 EP2212527 B1 EP 2212527B1
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EP
European Patent Office
Prior art keywords
mobile member
movable member
extreme
actuator
valve
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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
EP08872126A
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German (de)
French (fr)
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EP2212527A2 (en
Inventor
Emmanuel Talon
Nicolas Gelez
Julien Hobraiche
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Valeo Systemes de Controle Moteur SAS
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Valeo Systemes de Controle Moteur SAS
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Publication of EP2212527A2 publication Critical patent/EP2212527A2/en
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Publication of EP2212527B1 publication Critical patent/EP2212527B1/en
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    • 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

Definitions

  • the present invention relates to an electromagnetic actuator for example usable for the actuation of motor vehicle thermal engine valves.
  • electromagnetic actuators comprising a frame on which are mounted, on the one hand, a fixed member consisting of a frame provided with a plurality of coils and, secondly, a movable member or core provided with magnets permanent arranged next to the coils.
  • the coils are generally associated with a control unit arranged to feed the coils according to the desired displacement of the movable member.
  • the control unit is generally programmed to provide reciprocating movement of the movable member, reciprocating linear or circular movement according to the structure of the actuator, according to a stroke proper to the intended application.
  • the stroke corresponds to the necessary displacement of the movable member to move the valve between a closed position and an open position.
  • These actuators are generally devoid of elastic return element of the movable member, the structure of the actuator allowing the coils to move the movable member over its entire stroke and rendering unnecessary an elastic return of the movable member to the one or the other of these positions.
  • An object of the invention is to provide a means of remedying this disadvantage.
  • an electromagnetic actuator comprising a movable member and moving coils of the movable member in reciprocating motion between a first position and a second position of a nominal stroke.
  • the movable member is movable beyond the second position to an extreme position and the electromagnetic actuator comprises an elastic return element of the movable member to the first position, the return element being arranged to act on the mobile member essentially when it is in the vicinity of the extreme position.
  • the elastic return element accelerates the return of the movable member to the first position.
  • the elastic return element essentially acts on the movable member when it is moved beyond its second position.
  • the movable member comprises a stop for coming to bear against the return element and the return element is an elastically deformable element in a direction parallel to the reciprocating movement and is arranged to be in contact with the stop of the movable member as the movable member is between, on the one hand, the extreme position and, on the other hand, an intermediate position located between the second position and the extreme position.
  • This embodiment is furthermore particularly simple.
  • the actuator forming an electromagnetic valve actuator in which the first position is a closed position of the valve, the second position is a nominal valve opening position, and the extreme position is an extreme position opening beyond the nominal opening position.
  • the actuating device comprises an electromagnetic actuator generally designated 1.
  • the electromagnetic actuator 1 comprises an armature comprising a frame 2 having two opposite sides from which extend, protruding towards the inside of the frame 2, branches 3, namely a central branch and two external branches arranged on either side of the central branch.
  • Coils 4 extend around the outer branches 3.
  • the branches 3 of the two opposite sides have free ends facing each other in pairs and widened, defining between them a passage for a movable member namely a core generally designated 6.
  • the core 6 is formed of a plate incorporating magnets 7 which extend parallel to the free ends of the legs 3 and which are spaced by non-magnetic portions 8.
  • the core 6 is connected to a valve stem 9 by a rod 10 so that a displacement of the core 6 in its direction of sliding causes a corresponding displacement of the valve.
  • the rod 10 passes through a buffer 11 of elastomeric material attached to a fixed frame integral with the actuator.
  • the rod 10 comprises a stop 12 to abut the pad 11.
  • the pad 11 is elastically deformable in a direction parallel to the reciprocating movement of the movable member.
  • the coils 4 are connected to an electric power supply source controlled by a control unit 13 arranged to control the supply of the coils 4 in current and adjust the intensity delivered.
  • the control unit 13 may be the Valve Control Unit (VCU) or the Engine Control Unit (ECU).
  • control unit 13 drives the coils 4 to move the core 6 between a closed position X 1 of the valve and a nominal opening position X 2 of the valve (shown in FIG. figure 1 ).
  • control unit 13 drives the coils 4 to move the core 6 between the position closure valve X 1 of the valve and an extreme open position X 3 of the valve.
  • the extreme open position of the valve is located beyond the nominal opening position.
  • the buffer 11 forms a resilient return member of the movable member to the closed position and is arranged to act on the movable member substantially when it is in the vicinity of the extreme open position X 3 (see diagram 2 illustrating the force exerted on the movable member by the buffer 11 as a function of the position of the movable member).
  • the pad 11 is arranged to be in contact with the stop 12 of the movable member as long as the movable member is between, on the one hand, the extreme open position X 3 and, on the other hand, a intermediate position X 4 between the nominal opening position X 2 and the extreme open position X 3 .
  • the invention is applicable to actuators having a structure different from that described and for example to rotary rotary actuators.
  • a return element in permanent contact with the abutment 11, for example a spring having a negligible stiffness on the nominal stroke of the movable member, between the closed position and the nominal position of opening of the valve in the example described, and a stiffness increasing rapidly beyond the nominal stroke, that is to say between the nominal opening position and the extreme open position for the example described ( see it figure 3 illustrating the force exerted on the movable member by the spring as a function of the position of the movable member).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

The invention relates to an electromagnetic actuator that comprises a mobile member (6) and coils (4) for moving the mobile in an alternating movement between a first position and a second position of a nominal travel, wherein the mobile member can be moved beyond the second position into an end position, and the electromagnetic actuator includes an elastic return means (11) for returning the mobile member towards the first position, the return means being arranged for acting on the mobile member essentially when the latter is in the vicinity of the end position.

Description

La présente invention concerne un actionneur électromagnétique par exemple utilisable pour l'actionnement de soupapes de moteurs thermiques de véhicules automobiles.The present invention relates to an electromagnetic actuator for example usable for the actuation of motor vehicle thermal engine valves.

ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

Il est connu des actionneurs électromagnétiques comprenant un bâti sur lequel sont montés, d'une part, un organe fixe constitué d'une armature pourvue d'une pluralité de bobines et, d'autre part, un organe mobile ou noyau pourvu d'aimants permanents disposés en regard des bobines. Les bobines sont généralement associées à une unité de commande agencée pour alimenter les bobines en fonction du déplacement souhaité de l'organe mobile. L'unité de commande est généralement programmée pour assurer un mouvement alternatif de l'organe mobile, mouvement alternatif linéaire ou circulaire selon la structure de l'actionneur, selon une course propre à l'application envisagée. Ainsi, dans le cas de l'actionnement de soupape de moteur thermique, la course correspond au déplacement nécessaire de l'organe mobile pour déplacer la soupape entre une position de fermeture et une position d'ouverture. Ces actionneurs sont généralement dépourvus d'élément de rappel élastique de l'organe mobile, la structure de l'actionneur permettant aux bobines de déplacer l'organe mobile sur toute sa course et rendant inutiles un rappel élastique de l'organe mobile vers l'une ou l'autre de ces positions.It is known electromagnetic actuators comprising a frame on which are mounted, on the one hand, a fixed member consisting of a frame provided with a plurality of coils and, secondly, a movable member or core provided with magnets permanent arranged next to the coils. The coils are generally associated with a control unit arranged to feed the coils according to the desired displacement of the movable member. The control unit is generally programmed to provide reciprocating movement of the movable member, reciprocating linear or circular movement according to the structure of the actuator, according to a stroke proper to the intended application. Thus, in the case of actuating the heat engine valve, the stroke corresponds to the necessary displacement of the movable member to move the valve between a closed position and an open position. These actuators are generally devoid of elastic return element of the movable member, the structure of the actuator allowing the coils to move the movable member over its entire stroke and rendering unnecessary an elastic return of the movable member to the one or the other of these positions.

On a constaté que le pilotage d'un tel actionneur est délicat lorsque la fréquence du mouvement alternatif est relativement élevée. Il est en effet difficile d'obtenir une vitesse suffisante de l'organe mobile. Il a été envisagé d'obvier à cet inconvénient en interposant entre le bâti et l'organe mobile un ressort de rappel permettant d'accélérer le changément de sens de déplacement de l'organe mobile au cours de son mouvement alternatif. Un tel dispositif est décrit dans le document FR 2849466A Toutefois, le ressort exerce un effort s'opposant au déplacement de l'organe mobile, ceci à toutes les fréquences, y compris aux petites fréquences, augmentant ainsi la consommation de l'actionneur en énergie électrique.It has been found that the piloting of such an actuator is delicate when the frequency of the reciprocating movement is relatively high. It is indeed difficult to obtain sufficient speed of the movable member. It has been envisaged to obviate this drawback by interposing between the frame and the movable member a return spring allowing to accelerate the change of direction of movement of the movable member during its reciprocating movement. Such a device is described in the document FR 2849466A However, the spring exerts a force opposing the displacement of the movable member, this at all frequencies, including low frequencies, thus increasing the consumption of the actuator in electrical energy.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

Un but de l'invention est de fournir un moyen de remédier à cet inconvénient.An object of the invention is to provide a means of remedying this disadvantage.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

A cet effet, on prévoit, selon l'invention, un actionneur électromagnétique comportant un organe mobile et des bobines de déplacement de l'organe mobile selon un mouvement alternatif entre une première position et une deuxième position d'une course nominale. L'organe mobile est déplaçable au-delà de la deuxième position vers une position extrême et l'actionneur électromagnétique comprend un élément de rappel élastique de l'organe mobile vers la première position, l'élément de rappel étant agencé pour agir sur l'organe mobile essentiellement lorsque celui-ci est au voisinage de la position extrême.For this purpose, there is provided, according to the invention, an electromagnetic actuator comprising a movable member and moving coils of the movable member in reciprocating motion between a first position and a second position of a nominal stroke. The movable member is movable beyond the second position to an extreme position and the electromagnetic actuator comprises an elastic return element of the movable member to the first position, the return element being arranged to act on the mobile member essentially when it is in the vicinity of the extreme position.

Ainsi, l'élément de rappel élastique permet d'accélérer le retour de l'organe mobile vers la première position. L'élément de rappel élastique n'agit toutefois pour l'essentiel sur l'organe mobile que lorsque celui-ci est déplacé au-delà de sa deuxième position.Thus, the elastic return element accelerates the return of the movable member to the first position. The elastic return element, however, essentially acts on the movable member when it is moved beyond its second position.

Selon un mode de réalisation particulier, l'organe mobile comprend une butée pour venir en appui de l'élément de rappel et l'élément de rappel est un élément élastiquement déformable selon une direction parallèle au mouvement alternatif et est disposé pour être en contact avec la butée de l'organe mobile tant que l'organe mobile se trouve entre, d'une part, la position extrême et, d'autre part, une position intermédiaire située entre la deuxième position et la position extrême.According to a particular embodiment, the movable member comprises a stop for coming to bear against the return element and the return element is an elastically deformable element in a direction parallel to the reciprocating movement and is arranged to be in contact with the stop of the movable member as the movable member is between, on the one hand, the extreme position and, on the other hand, an intermediate position located between the second position and the extreme position.

Ceci permet de limiter le poids que l'actionneur doit déplacer sur la course nominale. Ce mode de réalisation est en outre particulièrement simple.This limits the weight that the actuator must move on the nominal stroke. This embodiment is furthermore particularly simple.

Dans une application particulière, l'actionneur formant un actionneur électromagnétique de soupape dans lequel la première position est une position de fermeture de la soupape, la deuxième position est une position nominale d'ouverture de la soupape, et la position extrême est une position extrême d'ouverture située au-delà de la position nominale d'ouverture.In a particular application, the actuator forming an electromagnetic valve actuator in which the first position is a closed position of the valve, the second position is a nominal valve opening position, and the extreme position is an extreme position opening beyond the nominal opening position.

D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit de modes de réalisation particuliers non limitatifs de l'invention.Other features and advantages of the invention will emerge on reading the following description of particular non-limiting embodiments of the invention.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

Il sera fait référence aux dessins annexés, parmi lesquels :

  • la figure 1 est une vue schématique en coupe d'un actionneur linéaire conforme à l'invention,
  • la figure 2 est un diagramme montrant l'évolution de la force de rappel en fonction de la position de l'organe mobile,
  • la figure 3 est un diagramme montrant l'évolution de la force de rappel en fonction de la position de l'organe mobile dans une variante de l'invention.
Reference will be made to the appended drawings, among which:
  • the figure 1 is a schematic sectional view of a linear actuator according to the invention,
  • the figure 2 is a diagram showing the evolution of the restoring force as a function of the position of the movable member,
  • the figure 3 is a diagram showing the evolution of the restoring force as a function of the position of the movable member in a variant of the invention.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

En référence à la figure 1, le dispositif d'actionnement conforme au premier mode de réalisation de l'invention comprend un actionneur électromagnétique généralement désigné en 1. L'actionneur électromagnétique 1 comprend une armature comportant un cadre 2 ayant deux côtés opposés à partir desquels s'étendent, en saillie vers l'intérieur du cadre 2, des branches 3 à savoir une branche centrale et deux branches externes disposées de part et d'autre de la branche centrale. Des bobines 4 s'étendent autour des branches 3 externes.With reference to the figure 1 , the actuating device according to the first embodiment of the invention comprises an electromagnetic actuator generally designated 1. The electromagnetic actuator 1 comprises an armature comprising a frame 2 having two opposite sides from which extend, protruding towards the inside of the frame 2, branches 3, namely a central branch and two external branches arranged on either side of the central branch. Coils 4 extend around the outer branches 3.

Les branches 3 des deux côtés opposés ont des extrémités libres, en regard deux à deux et élargies, délimitant entre elles un passage pour un organe mobile à savoir un noyau généralement désigné en 6. Le noyau 6 est formé d'une plaque incorporant des aimants permanents 7 qui s'étendent parallèlement aux extrémités libres des branches 3 et qui sont espacés par des parties amagnétiques 8. Le noyau 6 est relié à une queue de soupape 9 par une tige 10 de telle manière qu'un déplacement du noyau 6 dans sa direction de coulissement provoque un déplacement correspondant de la soupape.The branches 3 of the two opposite sides have free ends facing each other in pairs and widened, defining between them a passage for a movable member namely a core generally designated 6. The core 6 is formed of a plate incorporating magnets 7 which extend parallel to the free ends of the legs 3 and which are spaced by non-magnetic portions 8. The core 6 is connected to a valve stem 9 by a rod 10 so that a displacement of the core 6 in its direction of sliding causes a corresponding displacement of the valve.

La tige 10 passe au travers d'un tampon 11 de matériau élastomère fixé à un bâti fixe solidaire de l'actionneur. La tige 10 comprend une butée 12 pour venir en appui du tampon 11. Le tampon 11 est élastiquement déformable selon une direction parallèle au mouvement alternatif de l'organe mobile.The rod 10 passes through a buffer 11 of elastomeric material attached to a fixed frame integral with the actuator. The rod 10 comprises a stop 12 to abut the pad 11. The pad 11 is elastically deformable in a direction parallel to the reciprocating movement of the movable member.

Les bobines 4 sont reliées à une source d'alimentation en énergie électrique pilotée par une unité de commande 13 agencée pour commander l'alimentation des bobines 4 en courant et régler l'intensité délivrée.The coils 4 are connected to an electric power supply source controlled by a control unit 13 arranged to control the supply of the coils 4 in current and adjust the intensity delivered.

L'unité de commande 13 peut être l'unité de contrôle des soupapes (VCU, de l'anglais « Valve Control Unit ») ou l'unité de contrôle moteur (ECU, de l'anglais « Engine Control Unit »).The control unit 13 may be the Valve Control Unit (VCU) or the Engine Control Unit (ECU).

A bas et moyens régimes, l'unité de commande 13 pilote les bobines 4 pour déplacer le noyau 6 entre une position de fermeture X1 de la soupape et une position nominale d'ouverture X2 de la soupape (représentée sur la figure 1).At low and medium speeds, the control unit 13 drives the coils 4 to move the core 6 between a closed position X 1 of the valve and a nominal opening position X 2 of the valve (shown in FIG. figure 1 ).

A hauts régimes, l'unité de commande 13 pilote les bobines 4 pour déplacer le noyau 6 entre la position de fermeture X1 de la soupape et une position extrême d'ouverture X3 de la soupape. La position extrême d'ouverture de la soupape est située au-delà de la position nominale d'ouverture.At high speeds, the control unit 13 drives the coils 4 to move the core 6 between the position closure valve X 1 of the valve and an extreme open position X 3 of the valve. The extreme open position of the valve is located beyond the nominal opening position.

Le tampon 11 forme un élément de rappel élastique de l'organe mobile vers la position de fermeture et est disposé pour agir sur l'organe mobile essentiellement lorsque celui-ci est au voisinage de la position extrême d'ouverture X3 (voir le schéma 2 illustrant la force exercée sur l'organe mobile par le tampon 11 en fonction de la position de l'organe mobile). Ainsi le tampon 11 est disposé pour être en contact avec la butée 12 de l'organe mobile tant que l'organe mobile se trouve entre, d'une part, la position extrême d'ouverture X3 et, d'autre part, une position intermédiaire X4 située entre la position nominale d'ouverture X2 et la position extrême d'ouverture X3.The buffer 11 forms a resilient return member of the movable member to the closed position and is arranged to act on the movable member substantially when it is in the vicinity of the extreme open position X 3 (see diagram 2 illustrating the force exerted on the movable member by the buffer 11 as a function of the position of the movable member). Thus the pad 11 is arranged to be in contact with the stop 12 of the movable member as long as the movable member is between, on the one hand, the extreme open position X 3 and, on the other hand, a intermediate position X 4 between the nominal opening position X 2 and the extreme open position X 3 .

Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit et on peut y apporter des variantes de réalisation sans sortir du cadre de l'invention tel que défini par les revendications.Of course, the invention is not limited to the embodiment described and variants may be provided without departing from the scope of the invention as defined by the claims.

En particulier, l'invention est applicable à des actionneurs ayant une structure différente de celle décrite et par exemple à des actionneurs rotatifs alternatifs.In particular, the invention is applicable to actuators having a structure different from that described and for example to rotary rotary actuators.

En variante, il est possible d'utiliser comme élément de rappel en contact permanent avec la butée 11, par exemple un ressort ayant une raideur négligeable sur la course nominale de l'organe mobile, entre la position de fermeture et la position nominale d'ouverture de la soupape dans l'exemple décrit, et une raideur croissant rapidement au-delà de la course nominale, c'est-à-dire entre la position nominale d'ouverture et la position extrême d'ouverture pour l'exemple décrit (voir la figure 3 illustrant la force exercée sur l'organe mobile par le ressort en fonction de la position de l'organe mobile).Alternatively, it is possible to use as a return element in permanent contact with the abutment 11, for example a spring having a negligible stiffness on the nominal stroke of the movable member, between the closed position and the nominal position of opening of the valve in the example described, and a stiffness increasing rapidly beyond the nominal stroke, that is to say between the nominal opening position and the extreme open position for the example described ( see it figure 3 illustrating the force exerted on the movable member by the spring as a function of the position of the movable member).

D'autres applications de l'invention sont envisageables. Other applications of the invention are conceivable.

Claims (5)

  1. Electromagnetic actuator comprising a mobile member (6) and coils (4) for moving the mobile member back and forth between a first position and a second position through a nominal travel, characterized in that the mobile member can be moved beyond the second position towards an extreme position and in that the electromagnetic actuator comprises an elastic return element (11) for returning the mobile member to the first position, the return element being designed to act on the mobile element essentially when the latter is near the extreme position.
  2. Actuator according to Claim 1 in which the mobile member (6) comprises and end stop (12) to come to bear against the return element (11) and the return element is an element that is elastically deformable in a direction parallel to the back and forth movement and designed to be in contact with the end stop of the mobile member as long as the mobile member is between, on the one hand, the extreme position and, on the other hand, an intermediate position situated between the second position and the extreme position.
  3. Actuator according to Claim 2, in which the return element is a pad (11) of elastomeric material.
  4. Actuator according to any one of the preceding claims, in which the mobile member (6) is provided with permanent magnets (7) positioned facing the coils (4), the coils and the permanent magnets being arranged parallel to the movement of the mobile member.
  5. Actuator according to any one of the preceding claims, forming an electromagnetic actuator for a valve (9), in which actuator the first position is a position in which the valve is closed, the second position is a position in which the valve is in its nominally open position, and the extreme position is an extreme open position situated beyond the nominally open position.
EP08872126A 2007-11-22 2008-11-20 Electromagnetic actuator with end-of-travel elastic stop Not-in-force EP2212527B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0708198A FR2924264B1 (en) 2007-11-22 2007-11-22 ELECTROMAGNETIC ACTUATOR WITH ELASTIC END STOP.
PCT/FR2008/001621 WO2009098383A2 (en) 2007-11-22 2008-11-20 Electromagnetic actuator with end-of-travel elastic stop

Publications (2)

Publication Number Publication Date
EP2212527A2 EP2212527A2 (en) 2010-08-04
EP2212527B1 true EP2212527B1 (en) 2012-06-06

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EP08872126A Not-in-force EP2212527B1 (en) 2007-11-22 2008-11-20 Electromagnetic actuator with end-of-travel elastic stop

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EP (1) EP2212527B1 (en)
FR (1) FR2924264B1 (en)
WO (1) WO2009098383A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2995129B1 (en) * 2012-08-30 2017-10-20 Xap ELECTROMAGNETIC LINEAR DRIVE DEVICE COMPRISING A MOBILE MEMBER WITH A PLURALITY OF MAGNETIC MASSES.
CN106451990A (en) * 2016-11-02 2017-02-22 深圳市兆业电子科技有限公司 Permanent magnet linear motor and linear vibrator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2797297B1 (en) * 1999-08-06 2002-08-23 Renault ELECTRODYNAMIC VALVE OPERATING DEVICE
FR2818430B1 (en) * 2000-12-15 2003-04-18 Renault LINEAR DRIVE OF A VALVE USING MOBILE MAGNETS
FR2849466B1 (en) * 2002-12-27 2005-02-18 Renault Sa LINEAR VALVE ACTUATOR COMPRISING A MOBILE MAGNET IN A MAGNETIC INTERFER

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Publication number Publication date
WO2009098383A2 (en) 2009-08-13
FR2924264B1 (en) 2012-12-14
EP2212527A2 (en) 2010-08-04
FR2924264A1 (en) 2009-05-29
WO2009098383A3 (en) 2009-10-15

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