EP1519012A2 - Valve drive control for internal combustion engine, and engine using the same - Google Patents

Valve drive control for internal combustion engine, and engine using the same Download PDF

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Publication number
EP1519012A2
EP1519012A2 EP04300611A EP04300611A EP1519012A2 EP 1519012 A2 EP1519012 A2 EP 1519012A2 EP 04300611 A EP04300611 A EP 04300611A EP 04300611 A EP04300611 A EP 04300611A EP 1519012 A2 EP1519012 A2 EP 1519012A2
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EP
European Patent Office
Prior art keywords
valve
opening
current
defluxing
engine
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Granted
Application number
EP04300611A
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German (de)
French (fr)
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EP1519012B1 (en
EP1519012A3 (en
Inventor
Cédric Morin
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Publication of EP1519012A3 publication Critical patent/EP1519012A3/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 valve control for internal combustion engine and at a internal combustion engine comprising such a device, in particular for controlling a valve by means of an actuator electromechanical with a magnet.
  • a device 100 provided with an actuator 102 electromechanical valve 110 generally has springs 102 and 103 and electromagnets 106 and 108 for control the position of the valve 110 by means of signals Electrical controlled by a processor 101.
  • these electrical signals include currents for generating magnetic fields to move or hold the valve 110 in a given position.
  • the tail of the valve 110 is applied against the rod 112 of a magnetic plate 114 movable between the two electromagnets 106 and 108 so that, depending on the fields the plateau, the latter is move or hold in a position such that the valve 110 is open ( Figure 1a), allowing gas admission in cylinder 117, or closed (FIG. 1b), blocking the admission of gas into this cylinder 117.
  • the displacement of the valve 110 in an open position is obtained by controlling a current I and of attraction in the coil 107 of the electromagnet 106 which then attracts the plate 114 by means of a magnetic field H at , the shaft 112 of the plate moving the valve 110 in the open position.
  • the actuator 102 can be provided magnets 118 (electromagnet 108) and 116 (electromagnet 106), this last being represented in FIG. 1b, intended to optimize the operation of the device, in particular by reducing the noise actuator operation and the energy required to attracting and maintaining the tray 114 in a position switched.
  • each magnet is located on an electromagnet so that its magnetic field H ai maintains the movable plate against this electromagnet, as shown in Figure 1a.
  • the magnetic field H ai of the magnet participates in the attraction of the plate and, subsequently, this magnetic field H ai makes it possible to hold the plate 114 against an electromagnet with a reduced or even zero holding current.
  • the current I die defluxing has an opposite direction in the coils of an electromagnet in the direction of the current I at attraction.
  • a processor control strategy should therefore be set to determine the current I die weakening providing the control required valve.
  • the energy required by the defluxing current influences the electrical consumption of the actuator (ordinate axis 304) so that an optimum energy 306 can be obtained for a switching delay ⁇ t1 ( Figure 4, the y-axis 400 representing switching times) greater than the delay ⁇ t o minimum switch, this delay ⁇ t o minimum requiring greater electrical energy.
  • the power consumption of the low engine speed device while the lengthening of the switching time of the valve can correspond to the cycle longer engine of a low speed engine.
  • the present invention results from the observation that control of the defluxing current according to the only regime motor has the disadvantage of not allowing a good optimization of the operation of an electromagnet actuator.
  • an actuator electromagnet makes it possible to control a valve according to many parameters other than the engine speed, as example the pressure of the gases at the inlet of a cylinder, the rate of exhaust gases recycled in the intake gases, the quantity of gas to be admitted to the cylinder and / or the number of active valves.
  • the deceleration of a vehicle from a rpm raised by a driver's foot lift vis-à-vis the accelerator pedal reduces the load to the lowest achievable according to the speed up to a return to engine speed slow motion.
  • the invention results from the finding that, as detailed later, a variation of the speed opening and / or closing of a valve has an influence even lower than the duration during which the valve is open and / or closed is large.
  • the present invention relates to a control device of a combustion engine valve internal, this device comprising an electromechanical actuator equipped with a magnet and a processor controlling a current of defluxing generating a magnetic field opposite to the field magnet, characterized in that it comprises means for controlling this defluxing current according to the valve opening time and means for determining a speed of opening and / or closing of the valve to from its opening time, the controlled defluxing current ensuring the speed of opening and / or closure determined.
  • Such a device has the advantage of controlling the current of defluxing of the actuator according to the duration opening of the valve without prejudging the way it is determined, and not according to the state of the engine, described for example by the engine speed, as disclosed by the prior art, thus optimizing the operation of the actuator.
  • the duration opening of a valve is not descriptive of the condition of the engine, including his diet.
  • the determining a speed of opening and / or closing minimizes the energy consumption of the actuator while corresponding to the energy requirement of the engine.
  • the device comprises means to determine a speed of opening and / or closing of the valve from its opening time, the controlled defluxing current ensuring quick opening and / or determined closure.
  • the device comprises means to control the defluxing current by modifying its intensity and / or duration.
  • the device comprises means for determining the opening time of the valve at from engine parameters such as the engine speed, the amount of air admitted into the cylinder concerned, the pressure of the gas at the intake, the exhaust gas recirculation rate in intake gas and the number of active intake valves cylinder.
  • the magnet located on a electromagnet of the actuator, ensures the maintenance of the valve in an open or closed position without requiring a current of maintenance.
  • the actuator comprises two electromagnets, each electromagnet being provided with a magnet, by example to ensure the maintenance of the valve in a position open or closed without requiring a holding current.
  • the invention also relates to a combustion engine internally provided with a device for controlling a valve, this device comprising an electromechanical actuator provided with a magnet and a processor controlling a defluxing current generating a magnetic field opposite to the magnetic field of the magnet, characterized in that it comprises means for order this flow of defluxing according to the duration opening of the valve and means for determining a speed of opening and / or closing of the valve from its opening time, the defluxing current ordered ensuring the speed of opening and / or closure determined.
  • the engine comprises means to determine a speed of opening and / or closing of the valve from its opening time, the current of controlled inflighting ensuring the speed of opening and / or determined closure.
  • the engine comprises means to control the defluxing current by modifying its intensity and / or duration.
  • the engine comprises means to determine the opening time of the valve from engine parameters such as engine speed, quantity of air admitted into the cylinder concerned, the pressure of the gases admission, the rate of recycling of the exhaust gases intake and the number of active intake valves cylinder.
  • the example of device 500 (FIG. the invention described below uses a processor 501 controlling the defluxing current flowing in the coil 507 of the electromagnet 506 of a valve actuator 502 510.
  • This processor 501 receives, from another processor (not shown) or internally, that is to say, the same processor 501, an opening instruction of the valve 510 determining the time and duration of this opening.
  • the processor 501 determines how quickly the opening and / or closing of a valve must be carried out considering that, as detailed below using Figures 6a and 6b, the speed required to open a valve is a function of the duration of its opening.
  • the durations dt are represented by considering a first defluxing current Idé1 (dashed curve) and a second defluxing current Idé2 (continuous curve) of intensity and duration inferior to those of the first current Ide1.
  • the processor 501 includes means for determining a speed of opening minimum according to the duration of opening determined for the valve, this minimum opening speed allowing minimize the energy consumption of the actuator while corresponding to the need for engine operation.
  • the 501 processor can determine the defluxing current required to obtain this rapidity of opening, for example by means of a mapping.
  • the present invention is susceptible of many variants. Thus, it is possible to implement the invention in different actuators comprising one or two electromagnets.
  • the invention may apply to a actuator of which a single electromagnet is provided with a magnet, the magnet allowing, for example, the maintenance of the valve in closed position.
  • the invention can be implemented in considering a magnet generating a sufficient magnetic field important to maintain the valve in a fixed position, or switched, regardless of the number of electromagnets provided with lack of magnet (s).

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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)

Abstract

The device has a processor (501) for controlling a defluxing current circulating in a coil (507) of an electromagnet (506) of an electromechanical actuator (502), where the current generates a magnetic field opposite to the field of a magnet. The processor controls the defluxing current according to duration of opening of a valve (510) determined from engine parameters. The engine parameters are speed of motor, quantity of air input in concerned cylinder, an input gas pressure, rate of recycling of exhaust gas by the input gas and number of active input valves by cylinder. An independent claim is also included for an internal combustion engine.

Description

La présente invention se rapporte à un dispositif de commande de soupape pour moteur à combustion interne et à un moteur à combustion interne comprenant un tel dispositif, notamment pour commander une soupape au moyen d'un actionneur électromécanique muni d'un aimant.The present invention relates to a device for valve control for internal combustion engine and at a internal combustion engine comprising such a device, in particular for controlling a valve by means of an actuator electromechanical with a magnet.

Un dispositif 100 (figure 1a) muni d'un actionneur 102 électromécanique de soupape 110 comporte généralement des ressorts 102 et 103 et des électroaimants 106 et 108 pour commander la position de la soupape 110 au moyen de signaux électriques contrôlés par un processeur 101.A device 100 (FIG. 1a) provided with an actuator 102 electromechanical valve 110 generally has springs 102 and 103 and electromagnets 106 and 108 for control the position of the valve 110 by means of signals Electrical controlled by a processor 101.

Plus précisément, ces signaux électriques comprennent des courants destinés à générer des champs magnétiques permettant de déplacer ou de maintenir la soupape 110 dans une position donnée.More specifically, these electrical signals include currents for generating magnetic fields to move or hold the valve 110 in a given position.

A cet effet, la queue de la soupape 110 est appliquée contre la tige 112 d'un plateau magnétique 114 mobile entre les deux électroaimants 106 et 108 afin que, en fonction des champs magnétiques auxquels est soumis le plateau, ce dernier se déplace ou se maintienne dans une position telle que la soupape 110 soit ouverte (figure 1a), permettant une admission de gaz dans le cylindre 117, ou fermée (figure 1b), bloquant l'admission de gaz dans ce cylindre 117.For this purpose, the tail of the valve 110 is applied against the rod 112 of a magnetic plate 114 movable between the two electromagnets 106 and 108 so that, depending on the fields the plateau, the latter is move or hold in a position such that the valve 110 is open (Figure 1a), allowing gas admission in cylinder 117, or closed (FIG. 1b), blocking the admission of gas into this cylinder 117.

Par exemple, le déplacement de la soupape 110 dans une position ouverte (figure 1a) est obtenu en commandant un courant Iat d'attraction dans la bobine 107 de l'électroaimant 106 qui attire alors le plateau 114 au moyen d'un champ magnétique Hat, la tige 112 du plateau déplaçant la soupape 110 en position ouverte.For example, the displacement of the valve 110 in an open position (FIG. 1a) is obtained by controlling a current I and of attraction in the coil 107 of the electromagnet 106 which then attracts the plate 114 by means of a magnetic field H at , the shaft 112 of the plate moving the valve 110 in the open position.

Par ailleurs, l'actionneur 102 peut être muni d'aimants 118 (électroaimant 108) et 116 (électroaimant 106), ce dernier étant représenté sur la figure 1b, destinés à optimiser le fonctionnement du dispositif, notamment en réduisant le bruit de fonctionnement de l'actionneur et l'énergie nécessaire à l'attraction et au maintien du plateau 114 dans une position commutée.Furthermore, the actuator 102 can be provided magnets 118 (electromagnet 108) and 116 (electromagnet 106), this last being represented in FIG. 1b, intended to optimize the operation of the device, in particular by reducing the noise actuator operation and the energy required to attracting and maintaining the tray 114 in a position switched.

A cet effet, chaque aimant est situé sur un électroaimant de façon à ce que son champ magnétique Hai maintienne le plateau mobile contre cet électroaimant, comme montré sur la figure 1a.For this purpose, each magnet is located on an electromagnet so that its magnetic field H ai maintains the movable plate against this electromagnet, as shown in Figure 1a.

Ainsi, le champ magnétique Hai de l'aimant participe à l'attraction du plateau et, par la suite, ce champ magnétique Hai permet de maintenir le plateau 114 contre un électroaimant avec un courant de maintien réduit, voire nul.Thus, the magnetic field H ai of the magnet participates in the attraction of the plate and, subsequently, this magnetic field H ai makes it possible to hold the plate 114 against an electromagnet with a reduced or even zero holding current.

Toutefois, l'utilisation d'un aimant 118 (figure 1b) présente l'inconvénient que, lorsque le plateau 114 doit s'éloigner d'un électroaimant 108 muni de cet aimant 118 pour commander une commutation de la soupape 110, le champ magnétique Hai généré par cet aimant exerce une force de rappel qui s'oppose à cet éloignement, ce qui perturbe la commande de la soupape 110 en ralentissant son déplacement ou en empêchant complètement sa transition.However, the use of a magnet 118 (FIG. 1b) has the drawback that, when the plate 114 has to move away from an electromagnet 108 equipped with this magnet 118 to control a switching of the valve 110, the magnetic field H I generated by this magnet exerts a restoring force which opposes this distance, which disturbs the control of the valve 110 by slowing the removal or completely preventing its transition.

Pour limiter cet inconvénient, il est connu de commander un courant Idé, dénommé courant de défluxage, destiné à générer un champ magnétique Hdé compensant, partiellement ou totalement, le champ magnétique Hai généré par l'aimant 118 de l'électroaimant 108 de telle sorte que le plateau 114 est alors soumis aune force de rappel moindre.To limit this drawback, it is known to control a current I, referred to as field weakening current, for generating a compensating magnetic field H, partially or completely, the magnetic field H was generated by the magnet 118 of the electromagnet 108 such that the plate 114 is then subjected to a lower restoring force.

Il convient de noter que le courant Idé de défluxage a un sens opposé dans les bobines d'un électroaimant au sens du courant Iat d'attraction.It should be noted that the current I die defluxing has an opposite direction in the coils of an electromagnet in the direction of the current I at attraction.

L'influence du courant Idé de défluxage sur une commutation de soupape est détaillée ci-dessous à l'aide des figures 2a, qui représente la localisation (axe des ordonnées 200, en mm) du plateau magnétique 114 entre les deux électroaimants 106 et 108 en fonction du temps (axe des abscisses 202, en ms), et à l'aide de la figure 2b qui représente l'intensité et la durée du courant Idé de défluxage (axe des ordonnées 204) circulant dans la bobine 109 de l'électroaimant 108 en fonction de la même chronologie que celle de la figure 2a (axe des abscisses 202, en ms).The influence of the field weakening current I of a switching valve is detailed below using the figures 2a, which represents the location (y-axis 200, in mm) of the magnetic plate 114 between the two electromagnets 106 and 108 versus time (x-axis 202, in ms), and with Figure 2b represents the intensity and duration of the current I of defluxing (ordinate 204) flowing in the coil 109 of the electromagnet 108 according to the same chronology as that of Figure 2a (abscissa axis 202, in ms).

En comparant la rapidité de transition du plateau 114 de l'électroaimant 108 (200108) jusqu'à l'électroaimant 106 (200106) pour des courants Idé1 et Idé2 de défluxage d'intensité et de durée distinctes, on constate que la rapidité de la transition est d'autant plus importante que l'intensité et la durée de courant de défluxage sont élevées.By comparing the speed of transition of the plate 114 of the electromagnet 108 (200 108 ) to the electromagnet 106 (200 106 ) for currents I de1 and I de2 defluxage of distinct intensity and duration, it is found that the speed of the transition is all the more important as the intensity and duration of the defluxing current are high.

Empiriquement, la transition représentée par la courbe C1, en pointillés, utilisant un courant Idé1 de durée et d'intensité inférieures à celles du courant Idé2, requiert un délai plus important que la transition représentée par la courbe C2, en trait continu, associée à ce courant Idé2.Empirically, the transition represented by the curve C1, in dashed lines, using a current Idé1 of duration and of intensity lower than that of the current Idé2, requires a longer than the transition represented by the curve C2, in continuous line, associated with this current Idé2.

Il convient donc de définir une stratégie de commande du processeur afin de déterminer le courant Idé de défluxage fournissant la commande de la soupape requise.A processor control strategy should therefore be set to determine the current I die weakening providing the control required valve.

Toutefois, ce courant Idé de défluxage doit aussi être déterminé en considérant la consommation énergétique de l'actionneur afin d'optimiser cette dernière.However, this current I die defluxing must also be determined by considering the actuator power consumption to optimize it.

De fait, comme montré sur la figure 3, l'énergie requise par le courant de défluxage, représentée selon l'axe 302 des abscisses, influence la consommation électrique de l'actionneur (axe 304 des ordonnées) de telle sorte qu'un optimum énergétique 306 peut être obtenu pour un délai de commutation Δt1 (figure 4, l'axe des ordonnées 400 représentant des délais de commutation) supérieur au délai Δto minimum de commutation, ce délai Δto minimum requérant une énergie électrique plus importante.In fact, as shown in FIG. 3, the energy required by the defluxing current, represented along the axis 302 of the abscissae, influences the electrical consumption of the actuator (ordinate axis 304) so that an optimum energy 306 can be obtained for a switching delay Δt1 (Figure 4, the y-axis 400 representing switching times) greater than the delay Δt o minimum switch, this delay Δt o minimum requiring greater electrical energy.

Par ailleurs, le ralentissement de la soupape pour obtenir un temps de commutation plus important que le temps Δt1 de commutation optimal nécessite aussi plus d'énergie.Moreover, slowing the valve for to obtain a longer switching time than the time Δt1 Optimal switching also requires more energy.

C'est pourquoi, pour optimiser le courant de defluxage commandé, il est connu de réduire l'intensité du courant Idé de défluxage au fur et à mesure que le régime diminue.Therefore, to optimize the current defluxing controlled, it is known to reduce the intensity of the current I die weakening progressively as the speed decreases.

Ainsi, on réduit la consommation de courant du dispositif à faible régime moteur tandis que l'allongement de la durée de commutation de la soupape peut correspondre au cycle moteur plus long d'un moteur à faible régime.Thus, the power consumption of the low engine speed device while the lengthening of the switching time of the valve can correspond to the cycle longer engine of a low speed engine.

La présente invention résulte de la constatation que la commande du courant de défluxage en fonction du seul régime moteur présente l'inconvénient de ne pas permettre une bonne optimisation du fonctionnement d'un actionneur à électroaimant.The present invention results from the observation that control of the defluxing current according to the only regime motor has the disadvantage of not allowing a good optimization of the operation of an electromagnet actuator.

De fait, l'utilisation d'un actionneur à électroaimant permet de commander une soupape en fonction de nombreux paramètres autres que le régime moteur, comme par exemple la pression des gaz à l'entrée d'un cylindre, le taux de gaz d'échappement recyclés dans les gaz d'admission, la quantité de gaz devant être admise dans le cylindre et/ou le nombre de soupapes actives.In fact, the use of an actuator electromagnet makes it possible to control a valve according to many parameters other than the engine speed, as example the pressure of the gases at the inlet of a cylinder, the rate of exhaust gases recycled in the intake gases, the quantity of gas to be admitted to the cylinder and / or the number of active valves.

De fait, une même durée d'ouverture d'une soupape peut être obtenue avec un nombre important d'états de fonctionnement du moteur si cet état du moteur est uniquement décrit par le régime moteur et/ou la charge du moteur.In fact, the same duration of opening of a valve can be obtained with a large number of operating states of the engine if this engine condition is only described by the engine speed and / or engine load.

Par exemple, la décélération d'un véhicule depuis un régime élevé par un levé de pied du conducteur vis-à-vis de la pédale d'accélération réduit la charge au minimum atteignable en fonction du régime jusqu'à un retour au régime moteur au ralenti.For example, the deceleration of a vehicle from a rpm raised by a driver's foot lift vis-à-vis the accelerator pedal reduces the load to the lowest achievable according to the speed up to a return to engine speed slow motion.

Or, dans ce cas, on constate que ce ralentissement est obtenu avec une variation de régime et de charge tandis que la largeur du diagramme de soupape, ou durée d'ouverture des soupapes, appliquée est constante et correspond à la largeur minimum atteignable.However, in this case, we see that this slowdown is obtained with a variation of regime and load while the width of the valve diagram, or opening time of valves, applied is constant and corresponds to the width minimum achievable.

Inversement, à régime et charge constants, il est possible de constater une variation de la durée d'ouverture d'une soupape d'admission en fonction d'autres paramètres comme la pression de l'air d'admission, le nombre de soupapes actives, le nombre de cylindres actifs.Conversely, at constant speed and load, it is possible to see a change in the duration of the opening of an intake valve according to other parameters like the intake air pressure, the number of active valves, the number of active cylinders.

Aussi, il est nécessaire de prendre en compte dans la stratégie d'optimisation de commande du courant de défluxage un nombre important de paramètres décrivant l'état du moteur, rendant ainsi extrêmement complexe le fonctionnement et la mise au point d'une telle stratégie fonction du seul régime moteur.Also, it is necessary to take into account in the control optimization strategy of the defluxing current a a large number of parameters describing the state of the engine, thus making the operation and setting at the point of such a strategy function of the only engine speed.

Finalement, l'invention résulte de la constatation que, comme détaillé ultérieurement, une variation de la rapidité d'ouverture et/ou de fermeture d'une soupape a une influence d'autant plus faible que la durée pendant laquelle la soupape est ouverte et/ou fermée est grande.Finally, the invention results from the finding that, as detailed later, a variation of the speed opening and / or closing of a valve has an influence even lower than the duration during which the valve is open and / or closed is large.

C'est pourquoi, la présente invention concerne un dispositif de commande d'une soupape de moteur à combustion interne, ce dispositif comprenant un actionneur électromécanique muni d'un aimant et un processeur commandant un courant de défluxage générant un champ magnétique opposé au champ magnétique de l'aimant, caractérisé en ce qu'il comprend des moyens pour commander ce courant de défluxage en fonction de la durée d'ouverture de la soupape et des moyens pour déterminer une rapidité d'ouverture et/ou de fermeture de la soupape à partir de sa durée d'ouverture, le courant de défluxage commandé assurant la rapidité d'ouverture et/ou de fermeture déterminée.This is why the present invention relates to a control device of a combustion engine valve internal, this device comprising an electromechanical actuator equipped with a magnet and a processor controlling a current of defluxing generating a magnetic field opposite to the field magnet, characterized in that it comprises means for controlling this defluxing current according to the valve opening time and means for determining a speed of opening and / or closing of the valve to from its opening time, the controlled defluxing current ensuring the speed of opening and / or closure determined.

Un tel dispositif présente l'avantage de contrôler le courant de défluxage de l'actionneur en fonction de la durée d'ouverture de la soupape sans préjuger de la façon dont elle est déterminée, et non pas en fonction de l'état du moteur, décrit par exemple par le régime moteur, comme divulgué par l'art antérieur, optimisant ainsi le fonctionnement de l'actionneur.Such a device has the advantage of controlling the current of defluxing of the actuator according to the duration opening of the valve without prejudging the way it is determined, and not according to the state of the engine, described for example by the engine speed, as disclosed by the prior art, thus optimizing the operation of the actuator.

En d'autres termes, en considérant la durée d'ouverture de la soupape pour commander le courant de défluxage, l'invention permet l'application de différentes stratégies de commande d'une soupape sans avoir nécessairement connaissance du fonctionnement du moteur piloté par la dite soupape.In other words, considering the duration opening of the valve to control the flow of the invention allows the application of different control strategies of a valve without necessarily having knowledge of the operation of the motor driven by the so-called valve.

De fait, comme précédemment décrit, la durée d'ouverture d'une soupape n'est pas descriptive de l'état du moteur, et notamment de son régime.In fact, as previously described, the duration opening of a valve is not descriptive of the condition of the engine, including his diet.

Par ailleurs, comme détaillé ultérieurement, la détermination d'une rapidité d'ouverture et/ou de fermeture permet de minimiser la consommation énergétique de l'actionneur tout en correspondant au besoin énergétique du moteur.Furthermore, as detailed later, the determining a speed of opening and / or closing minimizes the energy consumption of the actuator while corresponding to the energy requirement of the engine.

Dans une réalisation, le dispositif comprend des moyens pour déterminer une rapidité d'ouverture et/ou de fermeture de la soupape à partir de sa durée d'ouverture, le courant de défluxage commandé assurant la rapidité d'ouverture et/ou de fermeture déterminée.In one embodiment, the device comprises means to determine a speed of opening and / or closing of the valve from its opening time, the controlled defluxing current ensuring quick opening and / or determined closure.

Selon une réalisation, le dispositif comprend des moyens pour contrôler le courant de défluxage en modifiant son intensité et/ou sa durée.According to one embodiment, the device comprises means to control the defluxing current by modifying its intensity and / or duration.

Dans une réalisation, le dispositif comprend des moyens pour déterminer la durée d'ouverture de la soupape à partir de paramètres moteurs tels que le régime du moteur, la quantité d'air admise dans le cylindre concerné, la pression des gaz à l'admission, le taux de recyclage des gaz d'échappement en gaz d'admission et le nombre de soupapes d'admission actives par cylindre.In one embodiment, the device comprises means for determining the opening time of the valve at from engine parameters such as the engine speed, the amount of air admitted into the cylinder concerned, the pressure of the gas at the intake, the exhaust gas recirculation rate in intake gas and the number of active intake valves cylinder.

Selon une réalisation, l'aimant, situé sur un électroaimant de l'actionneur, assure le maintien de la soupape dans une position ouverte ou fermée sans requérir un courant de maintien.According to one embodiment, the magnet, located on a electromagnet of the actuator, ensures the maintenance of the valve in an open or closed position without requiring a current of maintenance.

Dans une réalisation, l'actionneur comprend deux électroaimants, chaque électroaimant étant muni d'un aimant, par exemple pour assurer le maintien de la soupape dans une position ouverte ou fermée sans requérir un courant de maintien.In one embodiment, the actuator comprises two electromagnets, each electromagnet being provided with a magnet, by example to ensure the maintenance of the valve in a position open or closed without requiring a holding current.

L'invention concerne aussi un moteur à combustion interne muni d'un dispositif de commande d'une soupape, ce dispositif comprenant un actionneur électromécanique muni d'un aimant et un processeur commandant un courant de défluxage générant un champ magnétique opposé au champ magnétique de l'aimant, caractérisé en ce qu'il comprend des moyens pour commander ce courant de défluxage en fonction de la durée d'ouverture de la soupape et des moyens pour déterminer une rapidité d'ouverture et/ou de fermeture de la soupape à partir de sa durée d'ouverture, le courant de défluxage commandé assurant la rapidité d'ouverture et/ou de fermeture déterminée.The invention also relates to a combustion engine internally provided with a device for controlling a valve, this device comprising an electromechanical actuator provided with a magnet and a processor controlling a defluxing current generating a magnetic field opposite to the magnetic field of the magnet, characterized in that it comprises means for order this flow of defluxing according to the duration opening of the valve and means for determining a speed of opening and / or closing of the valve from its opening time, the defluxing current ordered ensuring the speed of opening and / or closure determined.

Dans une réalisation, le moteur comprend des moyens pour déterminer une rapidité d'ouverture et/ou de fermeture de la soupape à partir de sa durée d'ouverture, le courant de défluxage commandé assurant la rapidité d'ouverture et/ou de fermeture déterminée.In one embodiment, the engine comprises means to determine a speed of opening and / or closing of the valve from its opening time, the current of controlled inflighting ensuring the speed of opening and / or determined closure.

Selon une réalisation, le moteur comprend des moyens pour contrôler le courant de défluxage en modifiant son intensité et/ou sa durée.According to one embodiment, the engine comprises means to control the defluxing current by modifying its intensity and / or duration.

Dans une réalisation, le moteur comprend des moyens pour déterminer la durée d'ouverture de la soupape à partir de paramètres moteurs tels que le régime du moteur, la quantité d'air admise dans le cylindre concerné, la pression des gaz à l'admission, le taux de recyclage des gaz d'échappement en gaz d'admission et le nombre de soupapes d'admission actives par cylindre.In one embodiment, the engine comprises means to determine the opening time of the valve from engine parameters such as engine speed, quantity of air admitted into the cylinder concerned, the pressure of the gases admission, the rate of recycling of the exhaust gases intake and the number of active intake valves cylinder.

D'autres caractéristiques et avantages de l'invention apparaítront avec la description effectuée ci-dessous, à titre illustratif et non limitatif, effectuée en référence aux figures ci-jointes sur lesquelles :

  • Les figures 1a et 1b, déjà décrites, sont des schémas d'un actionneur électromécanique connu,
  • Les figures 2a et 2b, déjà décrites, représentent des différences de rapidité de commutation d'une soupape commandée selon des courants de défluxage distincts,
  • La figure 3, déjà décrite, est une courbe relative à l'énergie consommée par un actionneur utilisant un courant de défluxage,
  • La figure 4, déjà décrite, est une courbe relative au délai de commutation d'une soupape commandée par un actionneur utilisant un courant de défluxage,
  • La figure 5 est un schéma d'un dispositif conforme à l'invention, et
  • Les figures 6a et 6b représentent la mise en oeuvre d'une commande de courant de défluxage conforme à l'invention.
Other features and advantages of the invention will become apparent with the description given below, by way of illustration and not limitation, with reference to the attached figures in which:
  • FIGS. 1a and 1b, already described, are diagrams of a known electromechanical actuator,
  • FIGS. 2a and 2b, already described, represent differences in switching speed of a valve controlled according to distinct defluxing currents,
  • FIG. 3, already described, is a curve relating to the energy consumed by an actuator using a defluxing current,
  • FIG. 4, already described, is a curve relating to the switching delay of a valve controlled by an actuator using a defluxing current,
  • FIG. 5 is a diagram of a device according to the invention, and
  • Figures 6a and 6b show the implementation of a defluxing current control according to the invention.

L'exemple de dispositif 500 (figure 5) conforme à l'invention décrit ci-dessous utilise un processeur 501 contrôlant le courant de défluxage circulant dans la bobine 507 de l'électroaimant 506 d'un actionneur 502 de soupape 510.The example of device 500 (FIG. the invention described below uses a processor 501 controlling the defluxing current flowing in the coil 507 of the electromagnet 506 of a valve actuator 502 510.

Ce processeur 501 reçoit, de la part d'un autre processeur (non représenté) ou en interne, c'est-à-dire du même processeur 501, une consigne d'ouverture de la soupape 510 déterminant l'instant et la durée dt de cette ouverture.This processor 501 receives, from another processor (not shown) or internally, that is to say, the same processor 501, an opening instruction of the valve 510 determining the time and duration of this opening.

A partir de cette durée dt d'ouverture, le processeur 501 détermine avec quelle rapidité l'ouverture et/ou la fermeture d'une soupape doit s'effectuer en considérant que, comme détaillé ci-dessous à l'aide des figures 6a et 6b, la rapidité requise pour l'ouverture d'une soupape est fonction de la durée dt de son ouverture.From this opening period, the processor 501 determines how quickly the opening and / or closing of a valve must be carried out considering that, as detailed below using Figures 6a and 6b, the speed required to open a valve is a function of the duration of its opening.

Les durées dt sont représentées en considérant un premier courant de défluxage Idé1 (courbe en pointillés) et un second courant de défluxage Idé2 (courbe en trait continu) d'intensité et de durée inférieure à celles du premier courant Idé1.The durations dt are represented by considering a first defluxing current Idé1 (dashed curve) and a second defluxing current Idé2 (continuous curve) of intensity and duration inferior to those of the first current Ide1.

Il apparaít que, pour une durée dt d'ouverture élevée (figure 6a), une modification δt de la rapidité d'ouverture et de fermeture de la soupape 510 a un impact moindre sur le fonctionnement du moteur que lorsque cette durée dt d'ouverture de la soupape est faible (figure 6b).It appears that, for a period of high opening (FIG. 6a), a modification Δt of the speed of opening and closing the valve 510 has a lesser impact on the engine operation only when this duration of opening the valve is weak (Figure 6b).

C'est pourquoi, dans cette réalisation, le processeur 501 comprend des moyens pour déterminer une rapidité d'ouverture minimale en fonction de la durée d'ouverture déterminée pour la soupape, cette rapidité d'ouverture minimale permettant de minimiser la consommation énergétique de l'actionneur tout en correspondant au besoin du fonctionnement du moteur.This is why, in this embodiment, the processor 501 includes means for determining a speed of opening minimum according to the duration of opening determined for the valve, this minimum opening speed allowing minimize the energy consumption of the actuator while corresponding to the need for engine operation.

Dès lors, connaissant la rapidité d'ouverture et/ou de fermeture minimale(s) de la soupape, le processeur 501 peut déterminer le courant de défluxage nécessaire à l'obtention de cette rapidité d'ouverture, par exemple au moyen d'une cartographie.Therefore, knowing the speed of opening and / or minimum closure (s) of the valve, the 501 processor can determine the defluxing current required to obtain this rapidity of opening, for example by means of a mapping.

La présente invention est susceptible de nombreuses variantes. Ainsi, il est possible de mettre en oeuvre l'invention dans différents actionneurs comprenant un ou deux électroaimants.The present invention is susceptible of many variants. Thus, it is possible to implement the invention in different actuators comprising one or two electromagnets.

Dans ce dernier cas, l'invention peut s'appliquer à un actionneur dont un seul électroaimant est muni d'un aimant, l'aimant permettant, par exemple, le maintien de la soupape en position fermée.In the latter case, the invention may apply to a actuator of which a single electromagnet is provided with a magnet, the magnet allowing, for example, the maintenance of the valve in closed position.

Finalement, l'invention peut être mise en oeuvre en considérant un aimant générant un champ magnétique suffisamment important pour maintenir la soupape dans une position fixe, ou commutée, indépendamment du nombre d'électroaimants muni(s) ou démuni d'aimant(s).Finally, the invention can be implemented in considering a magnet generating a sufficient magnetic field important to maintain the valve in a fixed position, or switched, regardless of the number of electromagnets provided with lack of magnet (s).

Claims (8)

Dispositif (500) de commande d'une soupape (510) de moteur à combustion interne, ce dispositif comprenant un actionneur électromécanique (502) muni d'un aimant et un processeur (501) commandant un courant (Idé) de défluxage générant un champ magnétique opposé au champ magnétique de l'aimant, caractérisé en ce qu'il comprend des moyens (501) pour commander ce courant (Idé) de défluxage en fonction de la durée (dt) d'ouverture de la soupape (510) et des moyens pour déterminer une rapidité d'ouverture et/ou de fermeture de la soupape (510) à partir de cette durée (dt) d'ouverture, le courant (Idé) de défluxage commandé assurant la rapidité d'ouverture et/ou de fermeture déterminée.A device (500) for controlling an internal combustion engine valve (510), which device comprises an electromechanical actuator (502) provided with a magnet and a processor (501) controlling a defluxing current (Idé) generating a field magnetic field opposite to the magnetic field of the magnet, characterized in that it comprises means (501) for controlling this defluxing current (Id) as a function of the duration (dt) of opening of the valve (510) and the means for determining a speed of opening and / or closing of the valve (510) from this duration (dt) of opening, the flow (Id) of ordered defluxing ensuring the speed of opening and / or closing determined. Dispositif selon la revendication 1 caractérisé en ce qu'il comprend des moyens pour contrôler le courant (Idé) de défluxage en modifiant son intensité et/ou sa durée.Device according to claim 1 characterized in that it comprises means for controlling the current (Idé) defluxing by changing its intensity and / or its duration. Dispositif selon la revendication 1 ou 2 caractérisé en ce qu'il comprend des moyens pour déterminer la durée (dt) d'ouverture de la soupape à partir de paramètres moteurs tels que le régime (R) du moteur, la quantité (Q) d'air admise dans le cylindre concerné, la pression (P) des gaz à l'admission, le taux (T) de recyclage des gaz d'échappement en gaz d'admission et le nombre (N) de soupapes d'admission actives par cylindre.Device according to claim 1 or 2 characterized in that it comprises means for determining the duration (dt) of opening of the valve from engine parameters such as the engine speed (R), the quantity (Q) of air admitted into the cylinder concerned, the inlet gas pressure (P), the exhaust gas recirculation rate (T) and the number (N) of active intake valves by cylinder. Dispositif selon la revendication 1, 2 ou 3 caractérisé en ce que l'aimant, situé sur un électroaimant (506, 508) de l'actionneur (502), assure le maintien de la soupape (510) dans une position ouverte ou fermée sans requérir un courant de maintien.Device according to claim 1, 2 or 3 characterized in that the magnet, located on an electromagnet (506, 508) of the actuator (502), ensures the maintenance of the valve (510) in an open or closed position without require a holding current. Dispositif selon l'une des revendications précédentes caractérisé en ce que, l'actionneur (502) comprenant deux électroaimants (506, 508), chaque électroaimant (506, 508) est muni d'un aimant, par exemple pour assurer le maintien de la soupape (510) dans une position ouverte ou fermée sans requérir un courant de maintien. Device according to one of the preceding claims characterized in that , the actuator (502) comprising two electromagnets (506, 508), each electromagnet (506, 508) is provided with a magnet, for example to ensure the maintenance of the valve (510) in an open or closed position without requiring a holding current. Moteur à combustion interne muni d'un dispositif de commande d'une soupape (510), ce dispositif comprenant un actionneur électromécanique (502) muni d'un aimant et un processeur (501) commandant un courant (Idé) de défluxage générant un champ magnétique opposé au champ magnétique de l'aimant, caractérisé en ce qu'il comprend des moyens pour commander ce courant de défluxage en fonction de la durée (dt) d'ouverture de la soupape et des moyens pour déterminer une rapidité d'ouverture et/ou de fermeture de la soupape à partir de sa durée d'ouverture, le courant de défluxage commandé assurant la rapidité d'ouverture et/ou de fermeture déterminée.An internal combustion engine having a valve control device (510), the device comprising an electromechanical actuator (502) having a magnet and a processor (501) controlling a defluxing current (Idle) generating a field magnetic field opposite to the magnetic field of the magnet, characterized in that it comprises means for controlling this defluxing current as a function of the duration (dt) of opening of the valve and means for determining a speed of opening and or closing the valve from its opening time, the controlled defluxing current ensuring the speed of opening and / or closure determined. Moteur selon la revendication 6 caractérisé en ce qu'il comprend des moyens pour contrôler le courant de défluxage en modifiant son intensité et/ou sa durée.Motor according to Claim 6, characterized in that it comprises means for controlling the defluxing current by modifying its intensity and / or duration. Moteur selon la revendication 6 ou 7 caractérisé en ce qu'il comprend des moyens pour déterminer la durée d'ouverture de la soupape à partir de paramètres moteurs tels que le régime (R) du moteur, la quantité (Q) d'air admise dans le cylindre concerné, la pression (P) des gaz à l'admission, le taux (T) de recyclage des gaz d'échappement en gaz d'admission et le nombre (N) de soupapes d'admission actives par cylindre.Engine according to Claim 6 or 7, characterized in that it comprises means for determining the opening time of the valve from engine parameters such as the engine speed (R) and the quantity (Q) of air admitted. in the cylinder concerned, the pressure (P) of the gases at the intake, the rate (T) of recycling of the exhaust gases to the intake gas and the number (N) of active intake valves per cylinder.
EP04300611.3A 2003-09-24 2004-09-17 Valve drive control for internal combustion engine, and engine using the same Not-in-force EP1519012B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0350605A FR2860032B1 (en) 2003-09-24 2003-09-24 VALVE CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE COMPRISING SUCH A DEVICE
FR0350605 2003-09-24

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EP1519012A2 true EP1519012A2 (en) 2005-03-30
EP1519012A3 EP1519012A3 (en) 2008-09-03
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FR2875264A1 (en) * 2004-09-14 2006-03-17 Yterium Entpr Unipersonnelle A Valve control device for internal combustion engine, has processors in which demagnetization profiles are defined by table for determining demagnetization current to be applied at each instant for obtaining transition time threshold
ITGE20080036A1 (en) * 2008-04-30 2009-11-01 Dott Ing Mario Cozzani Srl METHOD FOR THE CONTROL OF THE POSITION OF AN ELECTROMECHANICAL ACTUATOR FOR VALVES OF ALTERNATIVE COMPRESSORS.

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US6279523B1 (en) * 1998-10-29 2001-08-28 Toyota Jidosha Kabushiki Kaisha Valve driving apparatus provided in an internal combustion engine
EP1010866A2 (en) * 1998-12-07 2000-06-21 Toyota Jidosha Kabushiki Kaisha Electromagnetic valve actuator

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FR2860032A1 (en) 2005-03-25
FR2860032B1 (en) 2007-07-20
EP1519012B1 (en) 2016-11-16
US7069886B2 (en) 2006-07-04
US20050081806A1 (en) 2005-04-21
EP1519012A3 (en) 2008-09-03

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