EP1288450A1 - Valve drive for an internal combustion engine - Google Patents

Valve drive for an internal combustion engine Download PDF

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Publication number
EP1288450A1
EP1288450A1 EP02292012A EP02292012A EP1288450A1 EP 1288450 A1 EP1288450 A1 EP 1288450A1 EP 02292012 A EP02292012 A EP 02292012A EP 02292012 A EP02292012 A EP 02292012A EP 1288450 A1 EP1288450 A1 EP 1288450A1
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EP
European Patent Office
Prior art keywords
valve
electromagnet
rod
control
opening
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Granted
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EP02292012A
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German (de)
French (fr)
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EP1288450B1 (en
Inventor
Emmanuel Sedda
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Publication of EP1288450A1 publication Critical patent/EP1288450A1/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 a device for electromagnetic type, to control the opening and closing an internal combustion engine valve.
  • an internal combustion engine has a combustion chamber in which a mixture is admitted fuel at selected times in the operating cycle.
  • This cycle includes, in particular, a period of admission to the course of valve (s) is (are) open and a compression period during which this (or these) valve (s) is (are) closed.
  • the opening command and closing of the valves is achieved by a synchronization mechanical type with the other engine components such as the crankshaft.
  • valves whose opening and closing command is made from electrical way, for example using one (or two) electromagnet (s) acting on a moving part causing the opening and closing movement of the valve combination with one or two springs.
  • the command to open and close valves can be done electronically and, from this In fact, the opening and closing moments can be chosen at will, which offers additional possibilities operating control of internal combustion engines.
  • FIG. 1 represents a known control device valve.
  • valve 10 is represented in closed position, that is to say applied against its seat 12. In this position, the interior 14 of the room of combustion is insulated from the outer part 16.
  • valve head 10 From the valve head 10 is secured a tail 18 forming a rod exiting the combustion chamber.
  • the valve 10 is kept in the closed state, that is to say applied against its seat 12, thanks to a spring 20 whose one end is integral with an outer wall of the combustion chamber and whose other end 22 bears against a stop 24 secured to the rod 18 in the vicinity of its free end 26.
  • two electromagnets 28 are furthermore provided, and 30 which control the displacement of a moving magnetic plate 32.
  • the latter is secured to a rod 34 of the same axis as the rod 18, and this rod passes through the magnetic circuits of two electromagnets 28 and 30.
  • the electromagnet 28, furthest from the chamber of combustion, is intended to attract the plate 32 so that, as shown, it is applied against a face 36 of the magnetic circuit of this electromagnet 28.
  • the end 38 of the rod 34 which is turned towards the chamber is slightly away from the end 26 of the rod 18; so the valve 10 is held in the closed position by the action of the spring 20.
  • the separation between the rods 34 and 18 by a game 40 called a distribution set, makes it possible to close complete valve, despite thermal expansion which may be more important for the stem 18, close to the combustion chamber, only for the rest of the device command, however subject to heating by currents of Foucault.
  • This game 40 also makes it possible to free oneself, in a some extent, manufacturing tolerances on the lengths stems 18 and 34.
  • the second end of the rod 34 is integral with a stop 42 against which supports a spring 44 whose other end 46 has a fixed position.
  • the second electromagnet 30 makes it possible to control the valve 10 in the open position.
  • the coil of this electromagnet 30 is activated after deactivation of the coil of the electromagnet 28.
  • the electromagnet 28 is deactivated, which makes it possible to separate the plate 32 of the face 36 of the magnetic circuit of the electromagnet 28. This separation is facilitated by the action of the 44. In these conditions, the end 38 of the rod 34 comes into contact with the end 26 of the stem 18, or tail, of valve. Then, the electromagnet 30 is activated to attract the movable platen 32 to one side of its magnetic circuit, this attraction to overcome the action of the spring 20.
  • the invention overcomes this disadvantage.
  • the device of command includes a means to limit the impact velocity of the actuating rod against the rod integral with the valve, this means exerting a holding force on the rod actuating.
  • This restraining force is, for example, exerted thanks to a power supply from the electromagnet commanding the closing, after the start of the opening command of the valve.
  • the holding force, thus exerted on the rod of actuation makes it possible to reduce the speed of impact, by example of 0.9 m / sec. at 0.25 m / sec.
  • the intensity of the current electric in the coil of the control electromagnet of closing is reduced to zero during a first period. Then a current pulse of intensity is then applied significantly lower than the expected intensity for the control of closing the valve, this pulse thus exerting the force restraint that limits the speed of impact, and therefore noise.
  • the temporal position of the current pulse of retained, its intensity and duration are, for example, determined empirically.
  • the cancellation of the current in the coil allows make sure that the moving plate moves away from the face corresponding of the electromagnet.
  • the invention relates, in general, to a device valve control system for an internal combustion engine, this device comprising an electromagnetic means, such as a electromagnet, controlling the movement of an element actuator, such as a rod, for controlling the displacement of a rod integral with the valve, the positions of the actuating element and the rod integral with the valve such that, when the valve is in the closed position, a clearance separates one end of the actuating element from a end of the rod secured to the valve, and these ends come into contact when ordering the opening of the valve.
  • This device is characterized in that it comprises a means to limit, during the opening phase of the valve, the impact speed of the end of the control element against the end of the rod secured to the valve.
  • the speed limiting means of impact includes a means to exercise on the element actuating a restraining force after the start of the valve opening control.
  • the means for exerting a retaining force comprises for example, a means for supplying current to an electromagnet intended for the closing command.
  • the intensity of the pulse of the current is substantially less than the intensity of the current supplying the electromagnet when the valve is to be kept in closed position.
  • the device preferably comprises a spring acting on the rod secured to the valve to maintain the latter in closed position.
  • the actuating element comprises, according to a embodiment, a rod integral with a movable plate on which acts an electromagnet control closing the valve.
  • a spring can be provided to push the actuating element towards the opening control position of the valve.
  • the invention also relates to a combustion engine internal having a valve control device of the type defined above.
  • Figure 2 is a diagram showing a circuit current control applied to the coil of the electromagnet 28 ( Figure 1).
  • This circuit 50 has an input 52 on which is applied a value i ref reference or reference intensity.
  • This circuit also comprises a feedback input 54 receiving a signal representative of the intensity of the current in the coil of the electromagnet 28; the latter is represented by a block 56 in FIG. 2.
  • the error signal produced from the reference signal of the feedback signal i is applied to a correction block 58 which supplies a control signal of the block 56.
  • This signal of control is converted to a power signal by a pulse width control 60 which outputs a signal u to the actuator 56.
  • a set of current on the input 52 which corresponds to the setpoint represented by the curve 64 of Figure 3.
  • This figure is a diagram on which the time in milliseconds has been plotted on the abscissa and on the ordinate the intensity of the current in the coil of the electromagnet 28.
  • a current of intensity I 1 of the order of 10 amperes is applied in the example. Then, to open the valve 10, that is to say to move the valve 10 away from its seat 12, the intensity of the current flowing through the coil is canceled, which corresponds to the falling edge 66 of the reference curve 64. , approximately 0.5 ms after the cancellation of the set point, a pulse of retention of intensity I 2 is provided , substantially lower than the intensity I 1 , of the order of 3 A in the example, for a duration of the order of 0.3 ms. After this pulse 68, the intensity of the current in the coil of the electromagnet 28 is reduced to zero.
  • the curve 70 in lines ends represents the actual evolution of the current in the coil of the electromagnet 28.
  • the difference between the instruction 64 and the actual intensity 70 is, in a classical way, due to the delay of enslavement and inductances, as well as induction of high intensity appearing for low values gap.
  • the invention can be used to to slow down the beginning of the movement of the actuating element good for an opening phase than closing. So, at beginning of the valve closing command, one can feed by running the electromagnet for controlling the opening.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Magnetically Actuated Valves (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The valve control for an internal combustion engine has an electromagnet (28) controlling the movement of an actuator rod (34) fixed to the valve. The drive is set to leave a play between the rod and valve when the latter is closed. A closure current is fed to the solenoid to exert a bias force on the valve after the commencement of the opening signal of the valve.

Description

La présente invention est relative à un dispositif, de type électromagnétique, pour commander l'ouverture et la fermeture d'une soupape de moteur à combustion interne.The present invention relates to a device for electromagnetic type, to control the opening and closing an internal combustion engine valve.

On sait qu'un moteur à combustion interne comporte une chambre de combustion dans laquelle est admis un mélange combustible à des moments choisis du cycle de fonctionnement. Ce cycle comporte, notamment, une période d'admission au cours de laquelle une (des) soupape(s) est (sont) ouverte(s) et une période de compression au cours de laquelle cette (ou ces) soupape(s) est (sont) fermée(s).It is known that an internal combustion engine has a combustion chamber in which a mixture is admitted fuel at selected times in the operating cycle. This cycle includes, in particular, a period of admission to the course of valve (s) is (are) open and a compression period during which this (or these) valve (s) is (are) closed.

Dans les moteurs classiques, la commande d'ouverture et de fermeture des soupapes est obtenue par une synchronisation de type mécanique avec les autres organes du moteur tels que le vilebrequin.In conventional engines, the opening command and closing of the valves is achieved by a synchronization mechanical type with the other engine components such as the crankshaft.

Dans la période récente sont apparues des soupapes dont la commande d'ouverture et de fermeture est effectuée de façon électrique, par exemple à l'aide d'un (ou deux) électroaimant(s) agissant sur une pièce mobile entraínant le mouvement d'ouverture et de fermeture de la soupape en combinaison avec un ou deux ressorts. In the recent period appeared valves whose opening and closing command is made from electrical way, for example using one (or two) electromagnet (s) acting on a moving part causing the opening and closing movement of the valve combination with one or two springs.

Ainsi, la commande d'ouverture et de fermeture des soupapes peut être effectuée de façon électronique et, de ce fait, les moments d'ouverture et de fermeture peuvent être choisis à volonté, ce qui offre des possibilités supplémentaires de commande de fonctionnement des moteurs à combustion interne.Thus, the command to open and close valves can be done electronically and, from this In fact, the opening and closing moments can be chosen at will, which offers additional possibilities operating control of internal combustion engines.

La figure 1 représente un dispositif connu de commande de soupape.FIG. 1 represents a known control device valve.

Dans ce dispositif connu, la soupape 10 est représentée en position fermée, c'est-à-dire appliquée contre son siège 12. Dans cette position, l'intérieur 14 de la chambre de combustion est isolé par rapport à la partie extérieure 16.In this known device, the valve 10 is represented in closed position, that is to say applied against its seat 12. In this position, the interior 14 of the room of combustion is insulated from the outer part 16.

De la tête de soupape 10 est solidaire une queue 18 formant une tige sortant de la chambre de combustion. La soupape 10 est maintenue à l'état fermé, c'est-à-dire appliquée contre son siège 12, grâce à un ressort 20 dont une extrémité est solidaire d'une paroi externe de la chambre de combustion et dont l'autre extrémité 22 est en appui contre une butée 24 solidaire de la tige 18 au voisinage de son extrémité libre 26.From the valve head 10 is secured a tail 18 forming a rod exiting the combustion chamber. The valve 10 is kept in the closed state, that is to say applied against its seat 12, thanks to a spring 20 whose one end is integral with an outer wall of the combustion chamber and whose other end 22 bears against a stop 24 secured to the rod 18 in the vicinity of its free end 26.

Pour la commande de l'ouverture et de la fermeture de la soupape 10, on prévoit, en outre, deux électroaimants 28 et 30 qui commandent le déplacement d'un plateau magnétique mobile 32. Ce dernier est solidaire d'une tige 34 de même axe que la tige 18, et cette tige traverse les circuits magnétiques des deux électroaimants 28 et 30.For the control of the opening and closing of the valve 10, two electromagnets 28 are furthermore provided, and 30 which control the displacement of a moving magnetic plate 32. The latter is secured to a rod 34 of the same axis as the rod 18, and this rod passes through the magnetic circuits of two electromagnets 28 and 30.

L'électroaimant 28, le plus éloigné de la chambre de combustion, est destiné à attirer le plateau 32 de façon que, comme représenté, celui-ci soit appliqué contre une face 36 du circuit magnétique de cet électroaimant 28. Dans cette position, l'extrémité 38 de la tige 34 qui est tournée vers la chambre est légèrement éloignée de l'extrémité 26 de la tige 18; ainsi la soupape 10 est maintenue en position fermée grâce à l'action du ressort 20. La séparation entre les tiges 34 et 18 par un jeu 40, appelé jeu de distribution, permet d'assurer la fermeture complète de la soupape, et cela malgré une dilatation thermique qui peut être plus importante pour la tige 18, proche de la chambre de combustion, que pour le reste du dispositif de commande, cependant soumis à un échauffement par courants de Foucault. Ce jeu 40 permet aussi de s'affranchir, dans une certaine mesure, de tolérances de fabrication sur les longueurs des tiges 18 et 34.The electromagnet 28, furthest from the chamber of combustion, is intended to attract the plate 32 so that, as shown, it is applied against a face 36 of the magnetic circuit of this electromagnet 28. In this position, the end 38 of the rod 34 which is turned towards the chamber is slightly away from the end 26 of the rod 18; so the valve 10 is held in the closed position by the action of the spring 20. The separation between the rods 34 and 18 by a game 40, called a distribution set, makes it possible to close complete valve, despite thermal expansion which may be more important for the stem 18, close to the combustion chamber, only for the rest of the device command, however subject to heating by currents of Foucault. This game 40 also makes it possible to free oneself, in a some extent, manufacturing tolerances on the lengths stems 18 and 34.

La seconde extrémité de la tige 34 est solidaire d'une butée 42 contre laquelle appuie un ressort 44 dont l'autre extrémité 46 présente une position fixe.The second end of the rod 34 is integral with a stop 42 against which supports a spring 44 whose other end 46 has a fixed position.

Le second électroaimant 30 permet de commander la soupape 10 en position d'ouverture. A cet effet, la bobine de cet électroaimant 30 est activée après désactivation de la bobine de l'électroaimant 28.The second electromagnet 30 makes it possible to control the valve 10 in the open position. For this purpose, the coil of this electromagnet 30 is activated after deactivation of the coil of the electromagnet 28.

Ainsi, pour l'ouverture de la soupape 10, l'électroaimant 28 est désactivé, ce qui permet de séparer le plateau 32 de la face 36 du circuit magnétique de l'électro-aimant 28. Cette séparation est facilitée par l'action du ressort 44. Dans ces conditions, l'extrémité 38 de la tige 34 vient en contact avec l'extrémité 26 de la tige 18, ou queue, de soupape. Ensuite, l'électroaimant 30 est activé pour attirer la plateau mobile 32 vers une face de son circuit magnétique, cette attraction permettant de vaincre l'action du ressort 20.Thus, for the opening of the valve 10, the electromagnet 28 is deactivated, which makes it possible to separate the plate 32 of the face 36 of the magnetic circuit of the electromagnet 28. This separation is facilitated by the action of the 44. In these conditions, the end 38 of the rod 34 comes into contact with the end 26 of the stem 18, or tail, of valve. Then, the electromagnet 30 is activated to attract the movable platen 32 to one side of its magnetic circuit, this attraction to overcome the action of the spring 20.

Lors de la phase d'ouverture de la soupape 10, l'extrémité 38 de la tige 34 entre en contact avec l'extrémité 26 de la tige 18, ce qui provoque un bruit d'impact. Ce bruit d'impact, qui apparaít de façon régulière, est désagréable pour l'utilisateur.During the opening phase of the valve 10, the end 38 of the rod 34 comes into contact with the end 26 of the rod 18, which causes an impact sound. This noise impact, which appears on a regular basis, is unpleasant for the user.

L'invention remédie à cet inconvénient.The invention overcomes this disadvantage.

Elle est caractérisée en ce que le dispositif de commande comprend un moyen pour limiter la vitesse d'impact de la tige d'actionnement contre la tige solidaire de la soupape, ce moyen exerçant une force de retenue sur la tige d'actionnement. Cette force de retenue est, par exemple, exercée grâce à une alimentation de l'électroaimant commandant la fermeture, après le début de la commande d'ouverture de la soupape. It is characterized in that the device of command includes a means to limit the impact velocity of the actuating rod against the rod integral with the valve, this means exerting a holding force on the rod actuating. This restraining force is, for example, exerted thanks to a power supply from the electromagnet commanding the closing, after the start of the opening command of the valve.

La force de retenue, ainsi exercée sur la tige d'actionnement permet de diminuer la vitesse d'impact, par exemple de 0,9 m/sec. à 0,25 m/sec.The holding force, thus exerted on the rod of actuation makes it possible to reduce the speed of impact, by example of 0.9 m / sec. at 0.25 m / sec.

Dans une réalisation, l'intensité du courant électrique dans la bobine de l'électroaimant de commande de fermeture est réduite à zéro pendant une première période. Puis on applique ensuite une impulsion de courant d'intensité sensiblement inférieure à l'intensité prévue pour la commande de fermeture de la soupape, cette impulsion exerçant ainsi la force de retenue qui limite la vitesse d'impact, et donc les bruits.In one embodiment, the intensity of the current electric in the coil of the control electromagnet of closing is reduced to zero during a first period. Then a current pulse of intensity is then applied significantly lower than the expected intensity for the control of closing the valve, this pulse thus exerting the force restraint that limits the speed of impact, and therefore noise.

La position temporelle de l'impulsion de courant de retenue, son intensité et sa durée sont, par exemple, déterminées de façon empirique.The temporal position of the current pulse of retained, its intensity and duration are, for example, determined empirically.

L'annulation du courant dans la bobine permet de s'assurer que le plateau mobile s'écarte de la face correspondante de l'électroaimant.The cancellation of the current in the coil allows make sure that the moving plate moves away from the face corresponding of the electromagnet.

L'invention concerne, de façon générale, un dispositif de commande de soupape pour moteur à combustion interne, ce dispositif comprenant un moyen électromagnétique, tel qu'un électroaimant, commandant le déplacement d'un élément d'actionnement, tel qu'une tige, destiné à commander le déplacement d'une tige solidaire de la soupape, les positions de l'élément d'actionnement et de la tige solidaire de la soupape étant telles que, lorsque la soupape est en position fermée, un jeu sépare une extrémité de l'élément d'actionnement d'une extrémité de la tige solidaire de la soupape, et ces extrémités entrent en contact lors de la commande d'ouverture de la soupape. Ce dispositif est caractérisé en ce qu'il comprend un moyen pour limiter, lors de la phase d'ouverture de la soupape, la vitesse d'impact de l'extrémité de l'élément de commande contre l'extrémité de la tige solidaire de la soupape.The invention relates, in general, to a device valve control system for an internal combustion engine, this device comprising an electromagnetic means, such as a electromagnet, controlling the movement of an element actuator, such as a rod, for controlling the displacement of a rod integral with the valve, the positions of the actuating element and the rod integral with the valve such that, when the valve is in the closed position, a clearance separates one end of the actuating element from a end of the rod secured to the valve, and these ends come into contact when ordering the opening of the valve. This device is characterized in that it comprises a means to limit, during the opening phase of the valve, the impact speed of the end of the control element against the end of the rod secured to the valve.

De préférence, le moyen de limitation de vitesse d'impact comprend un moyen pour exercer sur l'élément d'actionnement une force de retenue après le début de la commande d'ouverture de soupape. Preferably, the speed limiting means of impact includes a means to exercise on the element actuating a restraining force after the start of the valve opening control.

Le moyen pour exercer une force de retenue comprend, par exemple, un moyen pour alimenter en courant un électroaimant destiné à la commande de fermeture.The means for exerting a retaining force comprises for example, a means for supplying current to an electromagnet intended for the closing command.

Pour alimenter l'électroaimant de commande de fermeture, lors de la phase d'ouverture de la soupape, on peut prévoir un moyen qui, après l'annulation du courant dans la bobine de l'électroaimant, produit une impulsion de retenue.To power the control electromagnet closing, during the opening phase of the valve, one can provide a means which, after the cancellation of the current in the coil of the electromagnet, produces a retaining pulse.

Dans une réalisation, l'intensité de l'impulsion du courant de retenue est sensiblement inférieure à l'intensité du courant alimentant l'électroaimant lorsque la soupape doit être maintenue en position fermée.In one embodiment, the intensity of the pulse of the current is substantially less than the intensity of the current supplying the electromagnet when the valve is to be kept in closed position.

Le dispositif comporte de préférence un ressort agissant sur la tige solidaire de la soupape pour maintenir cette dernière en position fermée.The device preferably comprises a spring acting on the rod secured to the valve to maintain the latter in closed position.

L'élément d'actionnement comporte, selon une réalisation, une tige solidaire d'un plateau mobile sur lequel agit un électroaimant de commande de fermeture de la soupape. Dans ce cas, on peut prévoir un électroaimant agissant sur le plateau mobile pour commander l'ouverture de la soupape. Un ressort peut être prévu pour pousser l'élément d'actionnement vers la position de commande d'ouverture de la soupape.The actuating element comprises, according to a embodiment, a rod integral with a movable plate on which acts an electromagnet control closing the valve. In this case, an electromagnet acting on the movable platen to control the opening of the valve. A spring can be provided to push the actuating element towards the opening control position of the valve.

L'invention concerne aussi un moteur à combustion interne comportant un dispositif de commande de soupape du type défini ci-dessus.The invention also relates to a combustion engine internal having a valve control device of the type defined above.

D'autres caractéristiques et avantages de l'invention apparaítront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référant aux dessins ci-annexés sur lesquels

  • la figure 1, déjà décrite, représente un dispositif de commande de soupape auquel s'applique l'invention,
  • la figure 2 est un schéma d'un circuit d'asservissement utilisable dans le cadre de l'invention, et
  • la figure 3 est un diagramme montrant certains paramètres du dispositif de commande selon l'invention.
    • Other features and advantages of the invention will become apparent with the description of some of its embodiments, this being done with reference to the accompanying drawings in which:
  • FIG. 1, already described, represents a valve control device to which the invention applies,
  • FIG. 2 is a diagram of a servocontrol circuit that can be used in the context of the invention, and
  • Figure 3 is a diagram showing certain parameters of the control device according to the invention.

    • La figure 2 est un schéma montrant un circuit d'asservissement du courant appliqué à la bobine de l'électroaimant 28 (figure 1).Figure 2 is a diagram showing a circuit current control applied to the coil of the electromagnet 28 (Figure 1).

    Ce circuit 50 comporte une entrée 52 sur laquelle est appliquée une valeur iréf d'intensité de référence ou de consigne. Ce circuit comporte aussi une entrée 54 de rétroaction recevant un signal représentatif de l'intensité du courant dans la bobine de l'électroaimant 28; ce dernier est représenté par un bloc 56 sur la figure 2. Le signal d'erreur produit à partir du signal de consigne du signal i de rétroaction est appliqué à un bloc correcteur 58 qui fournit un signal de commande du bloc 56. Ce signal de commande est converti en un signal de puissance grâce à une commande de largeur d'impulsion 60 qui délivre un signal u à l'actionneur 56.This circuit 50 has an input 52 on which is applied a value i ref reference or reference intensity. This circuit also comprises a feedback input 54 receiving a signal representative of the intensity of the current in the coil of the electromagnet 28; the latter is represented by a block 56 in FIG. 2. The error signal produced from the reference signal of the feedback signal i is applied to a correction block 58 which supplies a control signal of the block 56. This signal of control is converted to a power signal by a pulse width control 60 which outputs a signal u to the actuator 56.

    Pour limiter la vitesse d'impact de l'extrémité 38 de la tige 34 contre l'extrémité 26 de la tige 18 lors de la phase d'ouverture de la soupape 10, on applique une consigne de courant sur l'entrée 52 qui correspond à la consigne représentée par la courbe 64 de la figure 3. Cette figure est un diagramme sur lequel on a porté en abscisses le temps, en millisecondes, et en ordonnées l'intensité du courant dans la bobine de l'électroaimant 28.To limit the impact speed of end 38 of the rod 34 against the end 26 of the rod 18 during the phase opening of the valve 10, a set of current on the input 52 which corresponds to the setpoint represented by the curve 64 of Figure 3. This figure is a diagram on which the time in milliseconds has been plotted on the abscissa and on the ordinate the intensity of the current in the coil of the electromagnet 28.

    Pour maintenir le plateau mobile 32 contre la face 36 du circuit magnétique de l'électroaimant 28, on applique un courant d'intensité I1 de l'ordre de 10 Ampères dans l'exemple. Ensuite, pour ouvrir la soupape 10, c'est-à-dire éloigner cette soupape 10 de son siège 12, on annule l'intensité du courant traversant la bobine, ce qui correspond au front descendant 66 de la courbe de consigne 64. Ensuite, environ 0,5 ms après l'annulation de la consigne, on prévoit une impulsion de retenue d'intensité I2, sensiblement inférieure à l'intensité I1, de l'ordre de 3 A dans l'exemple, pendant une durée de l'ordre de 0,3 ms. Après cette impulsion 68, l'intensité du courant dans la bobine de l'électroaimant 28 est ramenée à zéro. Ensuite, après l'impact de l'extrémité 38 contre l'extrémité 26, c'est-à-dire l'annulation du jeu 40, l'électroaimant 30 est actionné pour continuer l'attraction du plateau mobile dans le sens de l'ouverture de la soupape 10. Etant donné que cette phase est classique, elle n'est pas décrite ici.To maintain the movable plate 32 against the face 36 of the magnetic circuit of the electromagnet 28, a current of intensity I 1 of the order of 10 amperes is applied in the example. Then, to open the valve 10, that is to say to move the valve 10 away from its seat 12, the intensity of the current flowing through the coil is canceled, which corresponds to the falling edge 66 of the reference curve 64. , approximately 0.5 ms after the cancellation of the set point, a pulse of retention of intensity I 2 is provided , substantially lower than the intensity I 1 , of the order of 3 A in the example, for a duration of the order of 0.3 ms. After this pulse 68, the intensity of the current in the coil of the electromagnet 28 is reduced to zero. Then, after the impact of the end 38 against the end 26, that is to say the cancellation of the game 40, the electromagnet 30 is actuated to continue the attraction of the movable plate in the direction of the Opening the valve 10. Since this phase is conventional, it is not described here.

    Des expériences menées dans le cadre de l'invention ont montré que, sans la commande avec l'impulsion 68, représentée sur le diagramme de la figure 3, la vitesse d'impact est de l'ordre de 0,7 à 0,9 m/sec., alors qu'avec l'impulsion 68, on réduit cette vitesse d'impact à 0,2 m/sec. environ, ce qui réduit sensiblement le bruit de l'impact.Experiments carried out in the context of the invention have shown that without the command with pulse 68, shown in the diagram of Figure 3, the impact velocity is of the order of 0.7 to 0.9 m / sec., whereas with the impulse 68, this impact speed is reduced to 0.2 m / sec. about this which significantly reduces the noise of the impact.

    Sur le dessin de la figure 3, la courbe 70 en traits fins représente l'évolution réelle du courant dans la bobine de l'électroaiman 28. La différence entre la consigne 64 et l'intensité réelle 70 est, de façon classique, due au retard de l'asservissement et aux inductances, ainsi qu'à l'induction de forte intensité apparaissant pour les faibles valeurs d'entrefer.In the drawing of FIG. 3, the curve 70 in lines ends represents the actual evolution of the current in the coil of the electromagnet 28. The difference between the instruction 64 and the actual intensity 70 is, in a classical way, due to the delay of enslavement and inductances, as well as induction of high intensity appearing for low values gap.

    De façon générale, l'invention peut être utilisée pour freiner le début du mouvement de l'élément d'actionnement aussi bien pour une phase d'ouverture que de fermeture. Ainsi, au début de la commande de fermeture de soupape, on peut alimenter en courant l'électroaimant destiné à la commande de l'ouverture.In general, the invention can be used to to slow down the beginning of the movement of the actuating element good for an opening phase than closing. So, at beginning of the valve closing command, one can feed by running the electromagnet for controlling the opening.

    Claims (8)

    Dispositif de commande de soupape pour moteur à combustion interne, ce dispositif comprenant un moyen électromagnétique, tel qu'un électroaimant (28), commandant le déplacement d'un élément d'actionnement, tel qu'une tige (34), destiné à commander le déplacement d'une tige (18) solidaire de la soupape, les positions de l'élément d'actionnement et de la tige solidaire de la soupape étant telles que, lorsque la soupape est en position fermée, un jeu (40) sépare une extrémité (38) de l'élément d'actionnement (34) d'une extrémité (26) de la tige (18) solidaire de la soupape (10), et ces extrémités entrent en contact lors de la commande d'ouverture de la soupape, caractérisé en ce qu'il comprend, pour exercer sur l'élément d'actionnement (34) une force de retenue après le début de la commande d'ouverture de soupape (10), un moyen pour alimenter en courant un électroaimant (28) destiné à la commande de fermeture.A valve control device for an internal combustion engine, said device comprising an electromagnetic means, such as an electromagnet (28), controlling the displacement of an actuating element, such as a rod (34), for controlling the displacement of a rod (18) integral with the valve, the positions of the actuating element and the rod integral with the valve being such that, when the valve is in the closed position, a clearance (40) separates a end (38) of the actuating element (34) of one end (26) of the rod (18) integral with the valve (10), and these ends come into contact during the opening command of the valve, characterized in that it comprises, for exerting on the actuating element (34) a retaining force after the start of the valve opening control (10), means for supplying current to an electromagnet ( 28) for the closing command. Dispositif selon la revendication 1, caractérisé en ce qu'il comprend, pour alimenter l'électroaimant (28) de commande de fermeture, lors de la phase d'ouverture de la soupape, un moyen qui, après l'annulation du courant dans la bobine de l'électroaimant (28), produit une impulsion de retenue (68).Device according to claim 1, characterized in that it comprises, for supplying the closing control electromagnet (28), during the opening phase of the valve, means which, after the cancellation of the current in the coil of the electromagnet (28) produces a retaining pulse (68). Dispositif selon la revendication 2, caractérisé en ce que l'intensité de l'impulsion du courant de retenue est sensiblement inférieure à l'intensité du courant alimentant l'électroaimant lorsque la soupape (10) doit être maintenue en position fermée.Device according to claim 2, characterized in that the intensity of the impulse of the holding current is substantially less than the intensity of the current supplying the electromagnet when the valve (10) is to be kept in the closed position. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il comporte un ressort (20) agissant sur la tige solidaire de la soupape pour maintenir cette dernière en position fermée.Device according to one of the preceding claims, characterized in that it comprises a spring (20) acting on the rod integral with the valve to maintain the latter in the closed position. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'élément d'actionnement (34) comporte une tige solidaire d'un plateau mobile (32) sur lequel agit un électroaimant (28) de commande de fermeture de la soupape.Device according to one of the preceding claims, characterized in that the actuating element (34) comprises a rod integral with a movable plate (32) on which acts an electromagnet (28) for closing control of the valve. Dispositif selon la revendication 5, caractérisé en ce qu'il comporte un électroaimant (30) agissant sur le plateau mobile (32) pour commander l'ouverture de la soupape (10).Device according to claim 5, characterized in that it comprises an electromagnet (30) acting on the movable plate (32) to control the opening of the valve (10). Dispositif selon la revendication 6, caractérisé en ce qu'il comporte un ressort (44) pour pousser l'élément d'actionnement (34) vers la position de commande d'ouverture de la soupape (10).Device according to claim 6, characterized in that it comprises a spring (44) for urging the actuating element (34) towards the opening control position of the valve (10). Moteur à combustion interne comportant un dispositif de commande de soupape selon l'une des revendications précédentes.Internal combustion engine having a valve control device according to one of the claims preceding.
    EP02292012A 2001-08-30 2002-08-09 Valve drive for an internal combustion engine Expired - Lifetime EP1288450B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR0111239 2001-08-30
    FR0111239A FR2829177B1 (en) 2001-08-30 2001-08-30 VALVE CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

    Publications (2)

    Publication Number Publication Date
    EP1288450A1 true EP1288450A1 (en) 2003-03-05
    EP1288450B1 EP1288450B1 (en) 2006-02-08

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP02292012A Expired - Lifetime EP1288450B1 (en) 2001-08-30 2002-08-09 Valve drive for an internal combustion engine

    Country Status (4)

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    EP (1) EP1288450B1 (en)
    AT (1) ATE317493T1 (en)
    DE (1) DE60209098T2 (en)
    FR (1) FR2829177B1 (en)

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    Publication number Priority date Publication date Assignee Title
    US3882883A (en) * 1973-11-19 1975-05-13 Fairmont Railway Motors Inc Closed-open center hydraulic valve assembly
    JPH11236980A (en) * 1998-02-23 1999-08-31 Nissan Motor Co Ltd Valve driving device
    EP0959479A2 (en) * 1998-04-28 1999-11-24 Siemens Automotive Corporation A method for controlling velocity of an armature of an electromagnetic actuator
    DE19832196A1 (en) * 1998-07-17 2000-01-20 Bayerische Motoren Werke Ag Controlling armature motion in electromagnetically operated valve of internal combustion engine
    JP2000314305A (en) * 1999-04-30 2000-11-14 Toyota Motor Corp Solenoid driven valve

    Family Cites Families (3)

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    Publication number Priority date Publication date Assignee Title
    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
    FR2812684B1 (en) * 2000-08-01 2002-10-25 Sagem METHOD AND DEVICE FOR CONTROLLING THE OPENING OF A VALVE WITH ELECTROMAGNETIC ACTUATOR
    DE10112999A1 (en) * 2001-03-17 2002-09-19 Bayerische Motoren Werke Ag Procedure for switching off an internal combustion engine with electromagnetically operated gas exchange valves

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    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3882883A (en) * 1973-11-19 1975-05-13 Fairmont Railway Motors Inc Closed-open center hydraulic valve assembly
    JPH11236980A (en) * 1998-02-23 1999-08-31 Nissan Motor Co Ltd Valve driving device
    EP0959479A2 (en) * 1998-04-28 1999-11-24 Siemens Automotive Corporation A method for controlling velocity of an armature of an electromagnetic actuator
    DE19832196A1 (en) * 1998-07-17 2000-01-20 Bayerische Motoren Werke Ag Controlling armature motion in electromagnetically operated valve of internal combustion engine
    JP2000314305A (en) * 1999-04-30 2000-11-14 Toyota Motor Corp Solenoid driven valve

    Non-Patent Citations (2)

    * Cited by examiner, † Cited by third party
    Title
    PATENT ABSTRACTS OF JAPAN vol. 1999, no. 13 30 November 1999 (1999-11-30) *
    PATENT ABSTRACTS OF JAPAN vol. 2000, no. 14 5 March 2001 (2001-03-05) *

    Also Published As

    Publication number Publication date
    DE60209098T2 (en) 2007-07-12
    FR2829177B1 (en) 2005-12-02
    DE60209098D1 (en) 2006-04-20
    EP1288450B1 (en) 2006-02-08
    FR2829177A1 (en) 2003-03-07
    ATE317493T1 (en) 2006-02-15

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