EP1951994A1 - Method of controlling an actuator having a movable member with positional feedback control - Google Patents

Method of controlling an actuator having a movable member with positional feedback control

Info

Publication number
EP1951994A1
EP1951994A1 EP06831113A EP06831113A EP1951994A1 EP 1951994 A1 EP1951994 A1 EP 1951994A1 EP 06831113 A EP06831113 A EP 06831113A EP 06831113 A EP06831113 A EP 06831113A EP 1951994 A1 EP1951994 A1 EP 1951994A1
Authority
EP
European Patent Office
Prior art keywords
movable member
valve
actuator
extreme
electromagnetic means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06831113A
Other languages
German (de)
French (fr)
Inventor
Nicolas Gelez
Emmanuel Talon
Boris Bouchez
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.)
Valeo Systemes de Controle Moteur SAS
Original Assignee
Valeo Systemes de Controle Moteur SAS
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 Valeo Systemes de Controle Moteur SAS filed Critical Valeo Systemes de Controle Moteur SAS
Publication of EP1951994A1 publication Critical patent/EP1951994A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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 a method of controlling an electromagnetic actuator of a thermal engine valve such as a motor vehicle engine.
  • electromagnetic valve actuators which conventionally comprise elastic means and electromagnetic means for actuating the movable member between two extreme positions respectively corresponding to the open position of the valve and to the closed position of the valve.
  • the elastic means generally comprise a spring associated with the movable member to bias the latter resiliently in its extreme open position and a spring associated with the valve stem to resiliently bias the latter in its closed position and to bias elastically the movable member towards its extreme closing position.
  • the electromagnetic means generally comprise an electromagnet supplying and / or holding the movable member in the extreme open position and an electromagnet for supplying and / or holding the movable member in the extreme closed position .
  • the electromagnet is often associated with a permanent magnet in order to limit the consumption of one electromagnet. The arrival of the movable member in its extreme closed position in which it is in contact with the armature of one corresponding electromagnet generates noise.
  • the movable member and the valve are not connected to each other and there is a game commonly called “distribution game" between the movable member and the valve when the movable member is in the extreme closed position and the valve is correctly pressed against its seat by the spring associated with it.
  • the distribution clearance varies during operation of the engine, in particular as a function of temperature, and also during the life of the engine, in particular as a function of the wear of the valve and the various components of the actuator. valve.
  • the distribution clearance may vary from one actuator to another depending on the manufacturing tolerances thereof.
  • Stopping the movable member in the range of the distribution set is difficult and there is a risk that the movable member is stopped while the movable member is still in contact with the tail of the valve preventing the latter to be properly applied against his seat.
  • An object of the invention is to provide a means for optimizing the operation of the actuator.
  • a control method of a thermal engine valve actuator comprising a movable member for cooperating with a tail of the valve, permanent magnet electromagnetic means associated with resilient means for moving the movable member between an extreme closed position and an extreme open position of the valve, the method comprising the steps of:
  • the position control of the electromagnetic means from a setpoint position in the previously determined play range makes it possible to stop the movable member precisely in the desired position and allows an adaptation of the operation of the actuator for example to operating conditions of the engine.
  • the setpoint position is the intermediate position for which the electrical control parameter has a minimum value.
  • Maintaining the movable member in position is then provided at least in part by the permanent magnet, which allows to limit the consumption of electromagnetic means.
  • the set position is the intermediate position corresponding to a minimum distance between the movable member and the valve stem.
  • the invention is here described in application to the actuation of a valve 1 of a heat engine bearing the general reference 2.
  • the valve 1 has a shank 3 and is mounted on a cylinder head 4 of the engine 2 to slide between a closed position in which the valve is applied against a seat 5 of the cylinder head 4 and an open position in which the valve is detached from the seat 5 of the cylinder head 4.
  • the valve is actuated between these two positions via an actuator generally designated 6 mounted on the cylinder head 4 of the heat engine 2.
  • the actuator comprises a body 7 in which is mounted to slide a movable member generally designated 8 comprising a rod 9 having a first end 10 arranged to bear on a free end of the tail 3 of the valve 1 and a second end 11 secured to a pallet 12 received in a housing 13 of the body 7 to slide parallel to the rod 9.
  • the body 7 incorporates, in a manner known per se, electromagnetic means 14, 15 for moving the movable member 8.
  • the electromagnetic means 14 comprise, in a manner known per se, an electromagnet of attraction of the pallet 12 towards a position called the extreme position of closing the valve and an electromagnet of attrac- the pallet 12 to a position called the extreme open position of the valve which open on two opposite faces of the housing 13 of the body 7.
  • Each electromagnet comprises a coil wound on a frame to which is associated in known manner a magnet permanent.
  • the permanent magnet ensures all or part of the maintenance of the pallet in the corresponding position.
  • the pallet 12 is here in contact with the armature of the electromagnetic means 14, 15 when it is in the corresponding extreme position.
  • the electromagnetic means 14, 15 are controlled in a manner known per se by non-represented servocontrol means from a setpoint current and a moving speed of the movable member 8. This servo mode is known in itself.
  • the servo means are also arranged to allow servo-control as a function of a position command. This slaving can be ensured by the engine control unit which also operates a speed signal of the pallet 12 obtained by derivation of a position signal provided by a position sensor 16 of the rod 9.
  • the position sensor 16 is for example a Hall effect sensor known in itself.
  • the actuator also comprises, in a manner known per se, elastic displacement means.
  • the elastic displacement means comprise in a known manner in itself a spring 17 interposed between a face 18 of the body 7 and a shoulder 19 of the rod 9 to recall the pallet 12 in the extreme open position and a spring 20 interposed between a face 21 of the yoke 4 and a shoulder 22 of the valve stem 3 to return the valve 1 in the closed position.
  • the actuator, the cylinder head 4 and the valve 1 are arranged in such a way that when the pallet 12 is in the extreme closed position and the valve 1 is applied against its seat 5, there is a clearance j or clearance between the first end 10 of the rod 9 and the free end of the valve stem 3.
  • the method according to the invention starts with the phase of determining the game j during operation of the engine.
  • the method according to the invention comprises the step of controlling the electromagnetic means 14, 15 to move with a substantially constant speed the movable member 8 from its extreme closed position to its extreme open position.
  • the speed of movement of the movable member can be kept constant up to the extreme opening position or over a distance greater than a maximum possible clearance taking into account the geometric characteristics of the actuator, the valve and the cylinder head.
  • the method comprises the step of obtaining values of the target current for intermediate positions of the movable member during the displacement of the movable member 8 from the extreme closed position to the extreme open position and the step of detecting an intermediate position of the movable member 8 for which the setpoint current undergoes a sudden change.
  • the setpoint current is supplied by the servo-control means (but it could be measured or detected) and the intermediate positions of the movable member 8 are provided by the position sensor 16.
  • the setpoint current is then related to the intermediate positions of the movable member 8.
  • the detection of the intermediate position for which the setpoint current undergoes a sudden change is preferably made from the derivative of the reference current with respect to the position of the parameter. 12.
  • this derivative is shaped into a curve, the curve has peaks at the intermediate position corresponding to the meeting point of the movable member 8 and the valve stem 3.
  • the method then comprises the step of selecting as setpoint one of the intermediate positions in the game j as a function of desired performance of the actuator.
  • the selected target position is the intermediate position in which the supply current of the electromagnetic means 14 is zero (the attraction force of the corresponding permanent magnet compensates for the effort of the spring 17) or as low as possible (maximum attraction force of the permanent magnet).
  • the selected target position is the intermediate position corresponding to a minimum distance separating the rod 9 of the tail 3.
  • the set position becomes the closed position of the pallet in which the rod 9 is detached from the tail 3 of the valve 1 held in abutment against its seat 5 by the spring 20.
  • the electromagnetic means can be controlled to first bring the movable member 8 gently to the intermediate position determined above to bring the movable member 8 into contact with the valve stem 3, then accelerate the movable member 8 once it bears against the tail of valve.
  • the electromagnetic means can be controlled to first bring the movable member 8 quickly to the intermediate position corresponding to the beginning of the clearance j to have a quick closing of the valve, then gently move the movable member 8 in the closed position to limit the noise of the contact of the pallet 12 with the electromagnet 14.
  • the determination of the game j and intermediate positions is preferably renewed periodically, for example every second.
  • the clearance j can be determined with different modes of operation depending on the engine operating mode and the engine speed.
  • the determination of the play can be carried out for a displacement of the movable member towards the extreme open position as described above or towards the extreme position of closure.
  • the moving speed of the movable member will be kept substantially constant, for example from a median intermediate position of the pallet.
  • the electromagnetic means can be controlled from another electrical characteristic such as a set voltage.

Abstract

Method for controlling an actuator, the actuator comprising a movable member (8) for collaborating with a valve stem (3) and electromagnetic means of moving the movable member between an extreme valve-closed position and an extreme valve-open position, the method comprising the steps: - determining a timing tolerance band as the movable member moves between its extreme positions, - determining, within the timing tolerance band, intermediate positions according to an electrical parameter for the control of the electromagnetic means, - using positional feedback control to control the electromagnetic means, using one of the intermediate positions as a setpoint value.

Description

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Procédé de commande d'un act gane mobile asservi enA method of controlling a moving mobile operator in
La présente invention concerne un procédé de commande d'un actionneur électromagnétique d'une soupape de moteur thermique tel qu'un moteur thermique de véhicule automobile.The present invention relates to a method of controlling an electromagnetic actuator of a thermal engine valve such as a motor vehicle engine.
ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION
II existe des actionneurs électromagnétiques de soupape qui comprennent de façon classique des moyens élastiques et des moyens électromagnétiques d' actionnement de l'organe mobile entre deux positions extrêmes correspondant respectivement à la position d'ouverture de la soupape et à la position de fermeture de la soupape. Les moyens élastiques comprennent généralement un ressort associé à l'organe mobile pour rappeler celui-ci élastiquement dans sa position extrême d'ouverture et un ressort associé à la queue de soupape pour rappeler élastiquement celle-ci dans sa position de fermeture et pour rappeler élastiquement l'organe mobile vers sa position extrême de fermeture. Les moyens électromagnétiques comprennent généralement un électroaimant d'amenée et/ou de maintien de l'organe mobile dans la position extrême d'ouverture et un électroaimant d'amenée et/ou de maintien de l'organe mobile dans, la position extrême de fermeture. L 'électroaimant est souvent associé à un aimant permanent afin de limiter la consommation de 1 'électroaimant . L'arrivée de l'organe mobile dans sa position extrême de fermeture dans laquelle il est en contact avec l'armature de 1 ' électroaimant correspondant engendre du bruit.There are electromagnetic valve actuators which conventionally comprise elastic means and electromagnetic means for actuating the movable member between two extreme positions respectively corresponding to the open position of the valve and to the closed position of the valve. valve. The elastic means generally comprise a spring associated with the movable member to bias the latter resiliently in its extreme open position and a spring associated with the valve stem to resiliently bias the latter in its closed position and to bias elastically the movable member towards its extreme closing position. The electromagnetic means generally comprise an electromagnet supplying and / or holding the movable member in the extreme open position and an electromagnet for supplying and / or holding the movable member in the extreme closed position . The electromagnet is often associated with a permanent magnet in order to limit the consumption of one electromagnet. The arrival of the movable member in its extreme closed position in which it is in contact with the armature of one corresponding electromagnet generates noise.
Or, afin d'être certain que la soupape est correctement plaquée contre son siège lorsque l'organe mobile est en position extrême de fermeture, l'organe mobile et la soupape ne sont pas reliés l'un à l'autre et il existe un jeu couramment appelé « jeu de distribution » entre l'organe mobile et la soupape lorsque l'organe mobile est en position extrême de fermeture et la soupape est correctement plaquée contre son siège par le ressort qui lui est associé.However, in order to be certain that the valve is correctly pressed against its seat when the movable member is in the extreme closed position, the movable member and the valve are not connected to each other and there is a game commonly called "distribution game" between the movable member and the valve when the movable member is in the extreme closed position and the valve is correctly pressed against its seat by the spring associated with it.
Pour réduire le bruit du contact de l'organe mobile avec 1 ' électroaimant à la fermeture de la soupape, on a donc imaginé d'arrêter l'organe mobile dès que celui-ci a- quitté la queue de la soupape arrivée en appui contre son siège.In order to reduce the noise of contact of the movable member with the electromagnet when the valve is closed, it has therefore been imagined to stop the movable member as soon as the latter has left the tail of the valve which has come into abutment against his seat.
Toutefois, le jeu de distribution varie au cours du fonctionnement du moteur, notamment en fonction de la température, et également au cours de la vie du moteur, notamment en fonction de l'usure de la soupape et des différents composants de l'actionneur de soupape. En outre, le jeu de distribution peut varier d'un actionneur à un autre en fonction des tolérances de fabrication de ceux-ci .However, the distribution clearance varies during operation of the engine, in particular as a function of temperature, and also during the life of the engine, in particular as a function of the wear of the valve and the various components of the actuator. valve. In addition, the distribution clearance may vary from one actuator to another depending on the manufacturing tolerances thereof.
L'arrêt de l'organe mobile dans la plage du jeu de distribution est donc difficile et il existe un risque que l'organe mobile soit arrêté alors que l'organe mobile est toujours en contact avec la queue de la soupape empêchant cette dernière d'être correctement appliquée contre son siège.Stopping the movable member in the range of the distribution set is difficult and there is a risk that the movable member is stopped while the movable member is still in contact with the tail of the valve preventing the latter to be properly applied against his seat.
OBJET DE L'INVENTIONOBJECT OF THE INVENTION
Un but de l'invention est de fournir un moyen permettant d'optimiser le fonctionnement de l'actionneur.An object of the invention is to provide a means for optimizing the operation of the actuator.
RESUME DE L'INVENTIONSUMMARY OF THE INVENTION
A cet effet, on prévoit, selon l'invention, un procédé de commande d'un actionneur de soupape de moteur thermique, l'actionneur comprenant un organe mobile pour coopérer avec une queue de la soupape, des moyens électromagnétiques à aimant permanent associés à des moyens élastiques pour déplacer l'organe mobile entre une position extrême de fermeture et une position extrême d'ouverture de la soupape, le procédé comprenant les étapes de :For this purpose, there is provided, according to the invention, a control method of a thermal engine valve actuator, the actuator comprising a movable member for cooperating with a tail of the valve, permanent magnet electromagnetic means associated with resilient means for moving the movable member between an extreme closed position and an extreme open position of the valve, the method comprising the steps of:
- déterminer une plage de jeu entre l'organe mσ- bile et la queue de soupape lors du déplacement de l'organe mobile entre les positions extrêmes de fermeture et d ' ouverture ,- determine a range of play between the organ mσ- bile and the valve stem during the displacement of the movable member between the extreme positions of closing and opening,
- déterminer dans la plage de jeu des positions intermédiaires atteintes par l'organe mobile en fonction de différentes "valeurs d'un paramètre électrique de com-- determining in the clearance range of intermediate positions reached by the movable member according to different "values of an electrical parameter com-
- mande des moyens électromagnétiques,- electromagnetic means,
- asservir en position les moyens électromagnétiques en prenant une des positions intermédiaires comme consigne en fonction de performances souhaitées de l'ac- tionneur .- Ensuring in position the electromagnetic means by taking one of the intermediate positions as set according to the desired performance of the actuator.
L'asservissement en position des moyens électromagnétiques à partir d'une position de consigne située dans la plage de jeu préalablement déterminée permet d'arrêter précisément l'organe mobile dans la position souhaitée et permet une adaptation du fonctionnement de l'actionneur par exemple à des conditions de fonctionnement du moteur thermique .The position control of the electromagnetic means from a setpoint position in the previously determined play range makes it possible to stop the movable member precisely in the desired position and allows an adaptation of the operation of the actuator for example to operating conditions of the engine.
Selon un premier mode de mise en œuvre, la position de consigne est la position intermédiaire pour laquelle le paramètre électrique de commande a une valeur minimale .According to a first mode of implementation, the setpoint position is the intermediate position for which the electrical control parameter has a minimum value.
Le maintien de l'organe mobile en position est alors assuré au moins en partie par l'aimant permanent, ce qui permet de limiter la consommation des moyens électromagnétiques .Maintaining the movable member in position is then provided at least in part by the permanent magnet, which allows to limit the consumption of electromagnetic means.
Selon un deuxième mode de mise en œuvre, la position de consigne est la position intermédiaire correspondant à une distance minimale entre l'organe mobile et la queue de soupape .According to a second mode of implementation, the set position is the intermediate position corresponding to a minimum distance between the movable member and the valve stem.
La distance minimale laissée entre l'organe mobile et la queue de soupape est rapidement parcourue par l'organe mobile de sorte que le déplacement de l'organe mobile vers la position d'ouverture provoque quasi- immédiatement le déplacement de la soupape . D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit d'un mode de mise en œuvre particulier non limitatif de l'invention.The minimum distance left between the movable member and the valve stem is quickly traversed by the movable member so that the movement of the movable member to the open position almost immediately causes the displacement of the valve. Other features and advantages of the invention will emerge on reading the following description of a particular non-limiting embodiment of the invention.
BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS
II sera 'fait référence à la figure unique annexée représentant • schématiquement une soupape de moteur thermique associée à son dispositif d'actionnement . DESCRIPTION DETAILLEE DE L'INVENTIONIt will be 'refers to the single appended figure schematically representing • an engine valve associated with the actuator. DETAILED DESCRIPTION OF THE INVENTION
L'invention est ici décrite en application à l ' actionnement d'une soupape 1 d'un moteur thermique portant la référence générale 2.The invention is here described in application to the actuation of a valve 1 of a heat engine bearing the general reference 2.
La soupape 1 possède une queue 3 et est montée sur une culasse 4 du moteur thermique 2 pour coulisser entre une position de fermeture dans laquelle la soupape est appliquée contre un siège 5 de la culasse 4 et une position d'ouverture dans laquelle la soupape est décollée du siège 5 de la culasse 4.The valve 1 has a shank 3 and is mounted on a cylinder head 4 of the engine 2 to slide between a closed position in which the valve is applied against a seat 5 of the cylinder head 4 and an open position in which the valve is detached from the seat 5 of the cylinder head 4.
La soupape est actionnée entre ces deux positions par l'intermédiaire d'un actionneur généralement désigné en 6 monté sur la culasse 4 du moteur thermique 2.The valve is actuated between these two positions via an actuator generally designated 6 mounted on the cylinder head 4 of the heat engine 2.
L' actionneur comprend un corps 7 dans lequel est monté pour coulisser un organe mobile généralement désigné en 8 comportant une tige 9 ayant une première extrémité 10 agencée pour prendre appui sur une extrémité libre de la queue 3 de la soupape 1 et une deuxième extrémité 11 solidaire d'une palette 12 reçue dans un logement 13 du corps 7 pour coulisser parallèlement à la tige 9.The actuator comprises a body 7 in which is mounted to slide a movable member generally designated 8 comprising a rod 9 having a first end 10 arranged to bear on a free end of the tail 3 of the valve 1 and a second end 11 secured to a pallet 12 received in a housing 13 of the body 7 to slide parallel to the rod 9.
Le corps 7 incorpore de façon connue en elle-même des moyens électromagnétiques 14, 15 de déplacement de l'organe mobile 8.The body 7 incorporates, in a manner known per se, electromagnetic means 14, 15 for moving the movable member 8.
Les moyens électromagnétiques 14 comportent, de façon connue en elle-même, un électroaimant d'attraction de la palette 12 vers une position dite position extrême de fermeture de la soupape et un électroaimant d'attrac- tion de la palette 12 vers une position dite position extrême d'ouverture de la soupape qui débouchent sur deux faces opposées du logement 13 du corps 7. Chaque électroaimant comprend une bobine enroulée sur une armature à laquelle est associé de façon connue en soi un aimant permanent. L'aimant permanent assure en tout ou partie le maintien de la palette dans la position correspondante. La palette 12 est ici en contact avec l'armature des moyens électromagnétiques 14, 15 lorsqu'elle est dans la position extrême correspondante.The electromagnetic means 14 comprise, in a manner known per se, an electromagnet of attraction of the pallet 12 towards a position called the extreme position of closing the valve and an electromagnet of attrac- the pallet 12 to a position called the extreme open position of the valve which open on two opposite faces of the housing 13 of the body 7. Each electromagnet comprises a coil wound on a frame to which is associated in known manner a magnet permanent. The permanent magnet ensures all or part of the maintenance of the pallet in the corresponding position. The pallet 12 is here in contact with the armature of the electromagnetic means 14, 15 when it is in the corresponding extreme position.
Les moyens électromagnétiques 14, 15 sont commandés de façon connue en elle-même via des moyens non représentés d'asservissement à partir d'un courant de consigne et d'une vitesse de déplacement de l'organe mobile 8. Ce mode d'asservissement est connu en lui-même. Les moyens d'asservissement sont également agencés pour permettre un asservissement en fonction d'une consigne de position. Cet asservissement peut être assuré par l'unité de contrôle moteur qui exploite également un signal de vitesse de la palette 12 obtenu par dérivation d'un signal de position fourni par un capteur de position 16 de la tige 9. Le capteur de position 16 est par exemple un capteur à effet Hall connu en lui-même.The electromagnetic means 14, 15 are controlled in a manner known per se by non-represented servocontrol means from a setpoint current and a moving speed of the movable member 8. This servo mode is known in itself. The servo means are also arranged to allow servo-control as a function of a position command. This slaving can be ensured by the engine control unit which also operates a speed signal of the pallet 12 obtained by derivation of a position signal provided by a position sensor 16 of the rod 9. The position sensor 16 is for example a Hall effect sensor known in itself.
L'actionneur comprend également, de façon connue en soi, des moyens élastiques de déplacement.The actuator also comprises, in a manner known per se, elastic displacement means.
Les moyens élastiques de déplacement comprennent de façon connue en elle-même un ressort 17 intercalé entre une face 18 du corps 7 et un épaulement 19 de la tige 9 pour rappeler la palette 12 en position extrême d'ouverture et un ressort 20 intercalé entre une face 21 de la culasse 4 et un épaulement 22 de la queue de soupape 3 pour rappeler la soupape 1 en position de fermeture.The elastic displacement means comprise in a known manner in itself a spring 17 interposed between a face 18 of the body 7 and a shoulder 19 of the rod 9 to recall the pallet 12 in the extreme open position and a spring 20 interposed between a face 21 of the yoke 4 and a shoulder 22 of the valve stem 3 to return the valve 1 in the closed position.
L'actionneur, la culasse 4 et la soupape 1 sont agencés de telle manière que, lorsque la palette 12 est en position extrême de fermeture et la soupape 1 est appliquée contre son siège 5, il existe un jeu j ou jeu de distribution entre la première extrémité 10 de la tige 9 et l'extrémité libre de la queue de soupape 3.The actuator, the cylinder head 4 and the valve 1 are arranged in such a way that when the pallet 12 is in the extreme closed position and the valve 1 is applied against its seat 5, there is a clearance j or clearance between the first end 10 of the rod 9 and the free end of the valve stem 3.
Le procédé conformé à l'invention débute par la phase de déterminer le jeu j durant le fonctionnement du moteur thermique .The method according to the invention starts with the phase of determining the game j during operation of the engine.
Le procédé conforme à l'invention comprend l'étape de commander les moyens électromagnétiques 14, 15 pour déplacer avec une vitesse sensiblement constante l'organe mobile 8 de sa position extrême de fermeture vers sa position extrême d'ouverture. La vitesse de déplacement de l'organe mobile peut être maintenue constante jusqu'à la position extrême d'ouverture ou sur une distance supérieure à un jeu maximal possible compte tenu des caractéristiques géométriques de l ' actionneur, de la soupape et de la culasse.The method according to the invention comprises the step of controlling the electromagnetic means 14, 15 to move with a substantially constant speed the movable member 8 from its extreme closed position to its extreme open position. The speed of movement of the movable member can be kept constant up to the extreme opening position or over a distance greater than a maximum possible clearance taking into account the geometric characteristics of the actuator, the valve and the cylinder head.
Simultanément, le procédé comprend l'étape d'obtenir des valeurs du courant de consigne pour des positions intermédiaires de l'organe mobile pendant le déplacement de l'organe mobile 8 de la position extrême de fermeture à la position extrême d'ouverture et l'étape de détecter une position intermédiaire de l'organe mobile 8 pour laquelle le courant de consigne subit une brusque variation.Simultaneously, the method comprises the step of obtaining values of the target current for intermediate positions of the movable member during the displacement of the movable member 8 from the extreme closed position to the extreme open position and the step of detecting an intermediate position of the movable member 8 for which the setpoint current undergoes a sudden change.
Le courant de consigne est fourni par les moyens d'asservissement (mais il pourrait être mesuré ou détecté) et les positions intermédiaires de l'organe mobile 8 sont fournies par le capteur de position 16.The setpoint current is supplied by the servo-control means (but it could be measured or detected) and the intermediate positions of the movable member 8 are provided by the position sensor 16.
Le courant de consigne est alors mis en relation avec les positions intermédiaires de l'organe mobile 8.The setpoint current is then related to the intermediate positions of the movable member 8.
La détection de la position intermédiaire pour laquelle le courant de consigne subit une brusque variation est de préférence réalisée à partir de la dérivée du courant de consigne par rapport à la position de la pa- lette 12. Lorsque cette dérivée est mise sous forme d'une courbe, la courbe présente des pics au niveau de la position intermédiaire correspondant au point de rencontre de l'organe mobile 8 et de la queue de soupape 3.The detection of the intermediate position for which the setpoint current undergoes a sudden change is preferably made from the derivative of the reference current with respect to the position of the parameter. 12. When this derivative is shaped into a curve, the curve has peaks at the intermediate position corresponding to the meeting point of the movable member 8 and the valve stem 3.
Connaissant la position extrême de fermeture, on en déduit la distance entre cette position extrême de fermeture et la position intermédiaire précitée. Cette distance correspond au jeu j .Knowing the extreme position of closure, we deduce the distance between the extreme position of closure and the aforementioned intermediate position. This distance corresponds to the game j.
Le procédé comprend ensuite la phase de sélectionner comme consigne une des positions intermédiaires se trouvant dans le jeu j en fonction de performances souhaitées de 1 ' actionneur.The method then comprises the step of selecting as setpoint one of the intermediate positions in the game j as a function of desired performance of the actuator.
Si une consommation minimale de l' actionneur est recherchée, la position de consigne sélectionnée est la position intermédiaire dans laquelle le courant d'alimentation des moyens électromagnétiques 14 est nul (la force d'attraction de l'aimant permanent correspondant compense l'effort du ressort 17) ou le plus faible possible (force d'attraction maximale de l'aimant permanent) .If a minimum consumption of the actuator is desired, the selected target position is the intermediate position in which the supply current of the electromagnetic means 14 is zero (the attraction force of the corresponding permanent magnet compensates for the effort of the spring 17) or as low as possible (maximum attraction force of the permanent magnet).
Si une rêactivité de l' actionneur est recherchée, par exemple pour des hauts régimes de fonctionnement du moteur thermique, la position de consigne sélectionnée est la position intermédiaire correspondant à une distance minimale séparant la tige 9 de la queue 3.If a reactivity of the actuator is desired, for example for high operating speeds of the heat engine, the selected target position is the intermediate position corresponding to a minimum distance separating the rod 9 of the tail 3.
Lors des déplacements suivants de la palette, la position de consigne devient la position de fermeture de la palette dans laquelle la tige 9 est décollée de la queue 3 de la soupape 1 maintenue en appui contre son siège 5 par le ressort 20.During the following movements of the pallet, the set position becomes the closed position of the pallet in which the rod 9 is detached from the tail 3 of the valve 1 held in abutment against its seat 5 by the spring 20.
On notera en outre que, connaissant le jeu de distribution, il est possible de commander les moyens électromagnétiques plus efficace. Ainsi, lors du déplacement de l'organe mobile 8 de la position de fermeture à la position extrême d'ouverture, les moyens électromagnétiques peuvent être commandés pour d'abord amener l'organe mobile 8 doucement jusqu'à la position intermédiaire déterminée ci-dessus pour mettre en contact l'organe mobile 8 et la queue de soupape 3, puis accélérer l'organe mobile 8 une fois celui-ci en appui contre la queue de soupape.Note further that, knowing the distribution set, it is possible to control the electromagnetic means more effective. Thus, during the displacement of the movable member 8 from the closed position to the extreme open position, the electromagnetic means can be controlled to first bring the movable member 8 gently to the intermediate position determined above to bring the movable member 8 into contact with the valve stem 3, then accelerate the movable member 8 once it bears against the tail of valve.
Lors du déplacement de l'organe mobile 8 de la position extrême d'ouverture à la position extrême de fermeture, les moyens électromagnétiques peuvent être commandés pour d'abord amener l'organe mobile 8 rapidement jusqu'à la position intermédiaire correspondant au début du jeu j pour avoir une fermeture rapide de la soupape, puis d'amener doucement l'organe mobile 8 en position de fermeture pour limiter le bruit du contact de la palette 12 avec l ' électroaimant 14.During the displacement of the movable member 8 from the extreme open position to the extreme closed position, the electromagnetic means can be controlled to first bring the movable member 8 quickly to the intermediate position corresponding to the beginning of the clearance j to have a quick closing of the valve, then gently move the movable member 8 in the closed position to limit the noise of the contact of the pallet 12 with the electromagnet 14.
La détermination du jeu j et des positions intermédiaires est de préférence renouvelée périodiquement, par exemple toutes les secondes.The determination of the game j and intermediate positions is preferably renewed periodically, for example every second.
Bien entendu, l'invention n'est pas limitée au mode de mise en oeuvre qui vient d'être décrit, mais englobe au contraire toute variante rentrant dans le cadre de l'invention définie par les revendications.Of course, the invention is not limited to the embodiment that has just been described, but on the contrary covers any variant within the scope of the invention defined by the claims.
En particulier, la détermination du jeu j peut être effectuée avec des modes d'opération différents selon le mode de fonctionnement du moteur et le régime moteur.In particular, the clearance j can be determined with different modes of operation depending on the engine operating mode and the engine speed.
En outre, la détermination du jeu peut être réalisée pour un déplacement de l'organe mobile vers la position extrême d'ouverture comme décrit ci-dessus ou vers la position extrême de fermeture. Dans ce dernier cas, la vitesse de déplacement de l'organe mobile sera maintenue sensiblement constante par exemple à partir d'une position intermédiaire médiane de la palette.In addition, the determination of the play can be carried out for a displacement of the movable member towards the extreme open position as described above or towards the extreme position of closure. In the latter case, the moving speed of the movable member will be kept substantially constant, for example from a median intermediate position of the pallet.
Par ailleurs, les moyens électromagnétiques peuvent être commandés à partir d'une autre caractéristique électrique comme une tension de consigne. Moreover, the electromagnetic means can be controlled from another electrical characteristic such as a set voltage.

Claims

REVENDICATIONS
1. Procédé de commande d'un actionneur de soupape de moteur thermique (2), l' actionneur comprenant un organe mobile (8) pour coopérer avec une queue (3) de la soupape (1) , des moyens électromagnétiques à aimant permanent (14, 15) associés a des moyens élastiques (7) pour déplacer l'organe mobile entre une position extrême de fermeture et une position extrême d'ouverture de la soupape, caractérisé en ce que le procédé comprend les étapes de :A method of controlling a thermal engine valve actuator (2), the actuator comprising a movable member (8) for cooperating with a tail (3) of the valve (1), permanent magnet electromagnetic means ( 14, 15) associated with resilient means (7) for moving the movable member between an extreme closed position and an extreme open position of the valve, characterized in that the method comprises the steps of:
- déterminer une plage de jeu entre l'organe mobile et la queue de soupape lors du déplacement de l'organe mobile entre les positions extrêmes de fermeture et d ' ouverture ,- determining a range of play between the movable member and the valve stem during movement of the movable member between the extreme positions of closure and opening,
- déterminer dans la plage de jeu des positions intermédiaires atteintes par l'organe mobile en fonction de différentes valeurs d'un paramètre électrique de commande des moyens électromagnétiques,determining in the range of play intermediate positions reached by the movable member as a function of different values of an electrical control parameter of the electromagnetic means,
- asservir en position les moyens électromagnétiques en prenant comme consigne une des positions intermédiaires en fonction de performances souhaitées de l' actionneur.- Ensuring in position the electromagnetic means by taking as a set of intermediate positions as a function of desired performance of the actuator.
2. Procédé selon la revendication 1, dans lequel la position de consigne est la position intermédiaire pour laquelle le paramètre électrique de commande a une valeur minimale .2. The method of claim 1, wherein the setpoint position is the intermediate position for which the electrical control parameter has a minimum value.
3. Procédé selon la revendication 1, dans lequel la position de consigne est la position intermédiaire correspondant à une distance minimale entre l'organe mobile (8) et la queue de soupape (3) . 3. The method of claim 1, wherein the set position is the intermediate position corresponding to a minimum distance between the movable member (8) and the valve stem (3).
EP06831113A 2005-11-25 2006-11-14 Method of controlling an actuator having a movable member with positional feedback control Withdrawn EP1951994A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0511938A FR2893975B1 (en) 2005-11-25 2005-11-25 METHOD FOR CONTROLLING AN ACTUATOR HAVING A POSITIONED MOBILE MEMBER
PCT/FR2006/002514 WO2007060309A1 (en) 2005-11-25 2006-11-14 Method of controlling an actuator having a movable member with positional feedback control

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EP1951994A1 true EP1951994A1 (en) 2008-08-06

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EP (1) EP1951994A1 (en)
JP (1) JP5421592B2 (en)
KR (1) KR101337778B1 (en)
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WO (1) WO2007060309A1 (en)

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FR2922941B1 (en) * 2007-10-31 2014-05-02 Valeo Sys Controle Moteur Sas METHOD FOR DETERMINING A DISTRIBUTION GAME USING ACCELERATION
FR2925754B1 (en) * 2007-12-20 2015-06-05 Valeo Sys Controle Moteur Sas ELECTRO-MAGNET ASSEMBLY AND ELECTRO-MAGNET PALLET AND VALVE ACTUATOR COMPRISING SUCH AN ASSEMBLY
TWI426195B (en) * 2011-09-14 2014-02-11 Univ Nat Taipei Technology Electromagnetic valve mechanism

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DE19529155B4 (en) * 1995-08-08 2007-05-24 Fev Motorentechnik Gmbh Method for measuring the valve clearance on a gas exchange valve actuated by an electromagnetic actuator
DE19531437A1 (en) * 1995-08-26 1997-02-27 Fev Motorentech Gmbh & Co Kg Detecting play between IC engine gas exchange valve and its electromagnetic actuator
JP4126787B2 (en) * 1998-12-07 2008-07-30 トヨタ自動車株式会社 Electromagnetic drive device
JP2002054759A (en) * 2000-08-14 2002-02-20 Nissan Motor Co Ltd Controller for solenoid valve
US6997146B2 (en) * 2002-05-22 2006-02-14 Toyota Jidosha Kabushiki Kaisha Start control method and apparatus for solenoid-operated valves of internal combustion engine
FR2842862B1 (en) * 2002-07-25 2006-03-03 METHOD FOR DETERMINING A DISTRIBUTION GAME FROM AN ELECTRICAL POSITION / CHARACTERISTIC TORQUE
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JP2009517579A (en) 2009-04-30
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KR20080069957A (en) 2008-07-29
JP5421592B2 (en) 2014-02-19
US8443771B2 (en) 2013-05-21
WO2007060309A1 (en) 2007-05-31
KR101337778B1 (en) 2013-12-06
FR2893975B1 (en) 2008-02-08
US20090178631A1 (en) 2009-07-16

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