EP1288450B1 - Valve drive for an internal combustion engine - Google Patents

Valve drive for an internal combustion engine Download PDF

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Publication number
EP1288450B1
EP1288450B1 EP02292012A EP02292012A EP1288450B1 EP 1288450 B1 EP1288450 B1 EP 1288450B1 EP 02292012 A EP02292012 A EP 02292012A EP 02292012 A EP02292012 A EP 02292012A EP 1288450 B1 EP1288450 B1 EP 1288450B1
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EP
European Patent Office
Prior art keywords
valve
electromagnet
rod
opening
integral
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EP02292012A
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German (de)
French (fr)
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EP1288450A1 (en
Inventor
Emmanuel Sedda
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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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, of the electromagnetic type, for controlling the opening and closing of an internal combustion engine valve.
  • an internal combustion engine comprises a combustion chamber in which a fuel mixture is admitted at selected moments of the operating cycle.
  • This cycle comprises, in particular, an admission period during which one (of) valve (s) is (are) open (s) and a compression period during which this (or these) valve (s) is (are) closed.
  • the opening and closing control of the valves is achieved by mechanical synchronization with other engine components such as the crankshaft.
  • valves whose opening and closing control is performed electrically, for example using one (or two) electromagnet (s) acting on a moving part causing the movement of opening and closing of the valve in combination with one or two springs.
  • control of opening and closing of the valves can be effected electronically and, as a result, the opening and closing moments can be chosen at will, which offers additional possibilities of controlling the operation of the motors. internal combustion.
  • Figure 1 shows a known valve control device.
  • valve 10 is shown in the closed position, that is to say applied against its seat 12. In this position, the interior 14 of the combustion chamber is isolated relative to the outer part 16.
  • valve head 10 From the valve head 10 is secured a shank 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, by means of a spring 20 whose one end is integral with an outer wall of the combustion chamber and whose other end 22 is in abutment against a stop 24 secured to the rod 18 in the vicinity of its free end 26.
  • two electromagnets 28 and 30 are furthermore provided which control the displacement of a movable magnetic plate 32.
  • the latter is secured to a rod 34 likewise axis that the rod 18, and this rod passes through the magnetic circuits of the two electromagnets 28 and 30.
  • the electromagnet 28, farthest from the combustion chamber, 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; thus 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 set 40, called the distribution set ensures complete closure of the valve, and this despite a thermal expansion that may be greater for the rod 18, close to the combustion chamber, that for the rest of the control device, however subjected to a heating by eddy currents.
  • This game 40 also makes it possible to overcome, to a certain extent, manufacturing tolerances on the lengths of the rods 18 and 34.
  • the second end of the rod 34 is integral with a stop 42 against which a spring 44 rests, the 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 separates the plate 32 from the face 36 of the magnetic circuit of the electromagnet 28. This separation is facilitated by the action of the spring 44 Under these conditions, the end 38 of the rod 34 comes into contact with the end 26 of the stem 18, or tail, valve. Then, the electromagnet 30 is activated to attract the movable plate 32 to a face of its magnetic circuit, this attraction to overcome the action of the spring 20.
  • the invention overcomes the disadvantages mentioned above.
  • control device comprises means for limiting the speed of impact of the actuating rod against the rod integral with the valve, this means exerting a retaining force on the actuating rod.
  • This holding force is, for example, exerted through a power supply of the electromagnet controlling the closure, after the start of the opening command of the valve.
  • the holding force thus exerted on the actuating rod makes it possible to reduce the impact speed, for example by 0.9 m / sec. at 0.25 m / sec.
  • the intensity of the electric current in the coil of the closing control electromagnet is reduced to zero during a first period. Then, a current pulse of intensity substantially less than the intensity prescribed for the closing control of the valve is applied, this pulse thus exerting the retaining force which limits the speed of impact, and therefore the noises.
  • the time position of the holding current pulse, its intensity and duration are, for example, determined empirically.
  • the invention generally relates to a valve control device for an internal combustion engine, said device comprising an electromagnetic means, such as an electromagnet, controlling the displacement of an actuating element, 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 being such that, when the valve is in the closed position, a game separates an end of the actuating element of one end of the rod integral with the valve, and these ends come into contact during the opening control of the valve.
  • This device is characterized in that it comprises a means for limiting, during the opening phase of the valve, the speed of impact of the end of the control element against the end of the rod secured to the valve.
  • the impact velocity limiting means comprises means for exerting a retaining force on the actuating element after the start of the valve opening command.
  • the means for exerting a retaining force comprises, for example, means for supplying power to an electromagnet for closing control.
  • the intensity of the impulse of the holding current is substantially less than the current of the current supplying the electromagnet when the valve is to be held in the closed position.
  • the device preferably comprises a spring acting on the rod integral with the valve to maintain the latter in the closed position.
  • the actuating element comprises, in one embodiment, a rod integral with a movable platen on which acts an electromagnet control closing the valve.
  • a rod integral with a movable platen on which acts an electromagnet control closing the valve.
  • a spring may be provided to urge the actuating member toward the valve opening control position.
  • the invention also relates to an internal combustion engine comprising a valve control device of the type defined above.
  • Fig. 2 is a diagram showing a current servo circuit applied to the solenoid coil 28 (Fig. 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 current setpoint is applied to the inlet 52 which corresponds to to the setpoint represented by the curve 64 of FIG. 3.
  • This figure is a diagram on which the time, in milliseconds, is plotted on the abscissa and the intensity of the current in the coil of the electromagnet 28 is ordinate.
  • 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 , substantially lower than the intensity I 1 , of the order of 3 A in the example, is provided 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 electromagnet 30 is actuated to continue the attraction of the movable plate in the direction of the opening of the valve 10. Since this phase is conventional, it is not described here.
  • the curve 70 in fine lines represents the actual evolution of the current in the coil of the electromagnet 28.
  • the difference between the setpoint 64 and the actual intensity 70 is, in a conventional manner, due to the delay of the servocontrol and inductances, as well as the induction of strong intensity appearing for the low values of gap.
  • the invention can be used to slow down the beginning of the movement of the actuating element for both an opening and a closing phase.
  • the invention can be used to slow down the beginning of the movement of the actuating element for both an opening and a closing phase.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Valve Device For Special Equipments (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, of the electromagnetic type, for controlling the opening and closing of 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 comprises a combustion chamber in which a fuel mixture is admitted at selected moments of the operating cycle. This cycle comprises, in particular, an admission period during which one (of) valve (s) is (are) open (s) 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 and closing control of the valves is achieved by mechanical synchronization with 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 entraînant 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 control is performed electrically, for example using one (or two) electromagnet (s) acting on a moving part causing the movement of opening and closing of the valve in 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 control of opening and closing of the valves can be effected electronically and, as a result, the opening and closing moments can be chosen at will, which offers additional possibilities of controlling the operation of the motors. internal combustion.

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

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 shown in the closed position, that is to say applied against its seat 12. In this position, the interior 14 of the combustion chamber is isolated relative to 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 shank 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, by means of a spring 20 whose one end is integral with an outer wall of the combustion chamber and whose other end 22 is in abutment 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 and 30 are furthermore provided which control the displacement of a movable magnetic plate 32. The latter is secured to a rod 34 likewise axis that the rod 18, and this rod passes through the magnetic circuits of the 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, farthest from the combustion chamber, 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; thus 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 set 40, called the distribution set, ensures complete closure of the valve, and this despite a thermal expansion that may be greater for the rod 18, close to the combustion chamber, that for the rest of the control device, however subjected to a heating by eddy currents. This game 40 also makes it possible to overcome, to a certain extent, manufacturing tolerances on the lengths of the rods 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 a spring 44 rests, the 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'électroaimant 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 separates the plate 32 from the face 36 of the magnetic circuit of the electromagnet 28. This separation is facilitated by the action of the spring 44 Under these conditions, the end 38 of the rod 34 comes into contact with the end 26 of the stem 18, or tail, valve. Then, the electromagnet 30 is activated to attract the movable plate 32 to a face 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 apparaît 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 noise. This impact sound, which appears regularly, is unpleasant for the user.

L'état de la technique est constitué par les documents suivants : US 5 711 259 et EP-A-1 241 324, ce dernier document n'étant opposable qu'au titre de l'article 54(3) CBE.The state of the art consists of the following documents: US 5,711,259 and EP-A-1,241,324, the latter document being enforceable only under Article 54 (3) EPC.

L'invention remédie aux inconvénients mentionnés ci-dessus.The invention overcomes the disadvantages mentioned above.

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 control device comprises means for limiting the speed of impact of the actuating rod against the rod integral with the valve, this means exerting a retaining force on the actuating rod. This holding force is, for example, exerted through a power supply of the electromagnet controlling the closure, 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 actuating rod makes it possible to reduce the impact speed, for example by 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 electric current in the coil of the closing control electromagnet is reduced to zero during a first period. Then, a current pulse of intensity substantially less than the intensity prescribed for the closing control of the valve is applied, this pulse thus exerting the retaining force which limits the speed of impact, and therefore the noises.

La position temporelle de l'impulsion de courant de retenue, son intensité et sa durée sont, par exemple, déterminées de façon empirique.The time position of the holding current pulse, 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 makes it possible to ensure that the movable plate moves away from the corresponding face 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 generally relates to a valve control device for an internal combustion engine, said device comprising an electromagnetic means, such as an electromagnet, controlling the displacement of an actuating element, 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 being such that, when the valve is in the closed position, a game separates an end of the actuating element of one end of the rod integral with the valve, and these ends come into contact during the opening control of the valve. This device is characterized in that it comprises a means for limiting, during the opening phase of the valve, the speed of impact 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 impact velocity limiting means comprises means for exerting a retaining force on the actuating element after the start of the valve opening command.

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, means for supplying power to an electromagnet for closing control.

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 supply the closing control electromagnet, during the opening phase of the valve, provision may be made for a means which, after the current has been canceled in the solenoid coil, 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 impulse of the holding current is substantially less than the current of the current supplying the electromagnet when the valve is to be held in the 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 integral with the valve to maintain the latter in the 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, in one embodiment, a rod integral with a movable platen on which acts an electromagnet control closing the valve. In this case, one can provide an electromagnet acting on the movable plate to control the opening of the valve. A spring may be provided to urge the actuating member toward the valve opening control position.

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 an internal combustion engine comprising a valve control device of the type defined above.

D'autres caractéristiques et avantages de l'invention apparaîtront 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 characteristics and advantages of the invention will become apparent with the description of some of its embodiments, this being done with reference to the attached 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).Fig. 2 is a diagram showing a current servo circuit applied to the solenoid coil 28 (Fig. 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 velocity of the end 38 of the rod 34 against the end 26 of the rod 18 during the opening phase of the valve 10, a current setpoint is applied to the inlet 52 which corresponds to to the setpoint represented by the curve 64 of FIG. 3. This figure is a diagram on which the time, in milliseconds, is plotted on the abscissa and the intensity of the current in the coil of the electromagnet 28 is ordinate.

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 , substantially lower than the intensity I 1 , of the order of 3 A in the example, is provided 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 of 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 conducted in the context of the invention have shown that, without the control with the pulse 68, represented in the diagram of FIG. 3, the impact velocity is of the order of 0.7 to 0.9 m / sec., while with the pulse 68, this impact speed is reduced to 0.2 m / sec. approximately, 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'électroaimant 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 fine lines represents the actual evolution of the current in the coil of the electromagnet 28. The difference between the setpoint 64 and the actual intensity 70 is, in a conventional manner, due to the delay of the servocontrol and inductances, as well as the induction of strong intensity appearing for the low values of 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 slow down the beginning of the movement of the actuating element for both an opening and a closing phase. Thus, at the beginning of the valve closing command, it is possible to supply power to the electromagnet for controlling the opening.

Claims (7)

  1. Valve control device for an internal combustion engine, this device comprising an electromagnetic means such as an electromagnet (28) which controls the displacement of an actuation element such as a rod (34), which is designed to control the displacement of a rod (18) which is integral with the valve, the positions of the actuation element and of the rod which is integral with the valve being such that, when the valve is in the closed position, a gap (40) separates one end (38) of the actuation element (34) from one end (26) of the rod (18) which is integral with the valve (10), and these ends come into contact when the command for opening the valve is given, characterised in that, in order to exert a retention force on the actuation element (34) after the start of the command for opening of the valve (10), it comprises a means for supplying with current an electromagnet (28) which is designed for the closure command which produces a retention pulse (68), the intensity of which is substantially less than the intensity of the current which supplies the electromagnet when the valve (10) must be maintained in the closed position.
  2. Device according to claim 1, characterised in that the retention pulse occurs after elimination of the current in the coil of the electromagnet (28) which is designed for the closure.
  3. Device according to claim 1 or claim 2, characterised in that it comprises a spring (20) which acts on the rod which is integral with the valve, in order to maintain the latter in a closed position.
  4. Device according to claims 1, 2 or 3, characterised in that the actuation element (34) comprises a rod which is integral with a mobile plate (32) on which there acts an electromagnet (28) for control of closure of the valve.
  5. Device according to claim 4, characterised in that it comprises an electromagnet (30) which acts on the mobile plate (32) in order to command the opening of the valve (10).
  6. Device according to claim 5, characterised in that it comprises a spring (44) to thrust the actuation element (34) towards the position for the opening command for the valve (10).
  7. Internal combustion engine comprising a valve control device according to one of the preceding claims.
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
FR0111239A FR2829177B1 (en) 2001-08-30 2001-08-30 VALVE CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
FR0111239 2001-08-30

Publications (2)

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

Family

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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

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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5711259A (en) * 1995-08-08 1998-01-27 Fev Motorentechnik Gmbh & Co. Kg Method of measuring a valve play of an engine-cylinder valve operated by an electromagnetic actuator
EP1241324A1 (en) * 2001-03-17 2002-09-18 Bayerische Motoren Werke Aktiengesellschaft Method at shutdown of an internal combustion engine with electromagnetic valves

Family Cites Families (6)

* 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
US5991143A (en) * 1998-04-28 1999-11-23 Siemens Automotive Corporation 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
FR2812684B1 (en) * 2000-08-01 2002-10-25 Sagem METHOD AND DEVICE FOR CONTROLLING THE OPENING OF A VALVE WITH ELECTROMAGNETIC ACTUATOR

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5711259A (en) * 1995-08-08 1998-01-27 Fev Motorentechnik Gmbh & Co. Kg Method of measuring a valve play of an engine-cylinder valve operated by an electromagnetic actuator
EP1241324A1 (en) * 2001-03-17 2002-09-18 Bayerische Motoren Werke Aktiengesellschaft Method at shutdown of an internal combustion engine with electromagnetic valves

Also Published As

Publication number Publication date
FR2829177B1 (en) 2005-12-02
FR2829177A1 (en) 2003-03-07
DE60209098T2 (en) 2007-07-12
EP1288450A1 (en) 2003-03-05
DE60209098D1 (en) 2006-04-20
ATE317493T1 (en) 2006-02-15

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