EP1138884A1 - Method for the pilot opening of an exhaust gas valve of an engine with an electromechanical valve mechanism - Google Patents
Method for the pilot opening of an exhaust gas valve of an engine with an electromechanical valve mechanism Download PDFInfo
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- EP1138884A1 EP1138884A1 EP01400292A EP01400292A EP1138884A1 EP 1138884 A1 EP1138884 A1 EP 1138884A1 EP 01400292 A EP01400292 A EP 01400292A EP 01400292 A EP01400292 A EP 01400292A EP 1138884 A1 EP1138884 A1 EP 1138884A1
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- Prior art keywords
- opening
- valve
- pilot
- main
- cylinder
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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
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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
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/06—Timing or lift different for valves of same cylinder
Definitions
- the present invention relates to a control method the opening of an exhaust valve for a electromechanical distribution.
- an electromechanical actuator for cause the opening and closing movements of valves in an internal combustion engine, in order to carry out the admission and / or exhaust of combustion in the cylinders of this engine, constitutes a particularly well adapted technology, allowing achieve significant gains with respect to the engine fuel consumption and performance, further reducing pollution from exhaust gases in the air
- Such electromechanical actuators allow particular to obtain a variable adjustment of the angles, that is to say instants of opening and closing of each valve according to the conditions of use of the engine, in particular to optimize fuel efficiency of it.
- this set comprises, associated with the valve stem, one or more electromagnetic windings defining an air gap whose distance is substantially equal to the stroke of the valve head, the rod being integral with a plate transverse in magnetic material, housed in the air gap, so that depending on the current flowing through the coils, this tray is drawn to one side or the other, so that the valve moves from its position from opening to closing, the swash plate on either side of an equilibrium position intermediate.
- valve is controlled by two electromagnets.
- we know systems allowing to obtain the same result with only one winding, thanks to a particular geometry of the armature of the corresponding electromagnet.
- valve stem is also associated with springs working respectively and simultaneously in compression and in extension or vice versa as appropriate, in particular depending on the direction of movement of this valve stem, at opening or closing, the effect of these springs adding to that of the force of attraction electromagnetic exerted on the transverse plate.
- FIGS. 1a, 1b and 1c schematically illustrate a known device of this kind.
- reference 1 designates a rod illustrated in vertical position which has at its lower end a valve head 2 and at its opposite end a bearing surface 3 for a spring 4, mounted between this span and a fixed stop 5.
- the rod 1 has on the side of the valve head 2 a other bearing surface 6 for a second spring 7, mounted between this bearing surface and a fixed guide 8 having a bore through 9 in which slides, according to a movement of back and forth, the corresponding end of the rod 1.
- This rod is also equipped, between the spans support 3 and 6 of springs 4 and 7, of a plate transverse 10 which, if the rod is vertical, extends horizontally, this plate being mounted in an air gap 11 formed between two electromagnets, respectively 12 and 13, each of these electromagnets comprising a yoke 14 in magnetic material and an electrical winding 15, of so that the passage of a current through the windings of two electromagnets cause an effect on the plate 10 of attraction by one of these electromagnets and repulsion by the other, the valve head 2 thus oscillating between two positions where the plate is in contact with one or the other of the electromagnets.
- FIG 1a illustrates the equilibrium position of the assembly thus envisaged, in which the plate 10 is substantially in the middle of the air gap 11 between the two electromagnets 12 and 13, Figure 1b showing the position where this plate moved to be in contact of the electromagnet 12 and Figure 1c that where conversely, the plate is applied against the electromagnet 13.
- the present invention relates to a control method opening an exhaust valve using a electromechanical actuator of the kind described above, which overcomes these disadvantages.
- control method considered, for the opening of an exhaust valve subject to permanence of the effect of a thrust spring, characterized in that it consists in carrying out a gas decompression in the cylinder through an opening prior or "pilot” of this valve, before performed a complete or “main” opening.
- the opening of the valve exhaust is done first under the action of only springs, then supply the electromagnet (s) to bring and capture the valve in full position opening: although gas has started to escape, the pressure remains relatively high, causing disadvantages mentioned above.
- a pilot opening is first produced during which the valve opens and closes under the action of the springs alone, then a so-called opening "main opening” which takes place practically as the classic openings, this time capturing the valve in full open position.
- the valve does not reach its full opening position and is not captured in this position.
- the gases escaping during the entire duration of the pilot opening, then at the start of the main opening the residual pressure is a lot lower than in the prior art when feeding the electromagnet and the power consumption is more low.
- the method according to the invention therefore does not require for its implementation work that a very low overall energy expenditure, the mechanical work absorbed by the gases in the cylinder being minimal and partly offset by the fact that when of the pilot opening, we do not power the electromagnet to capture the valve in the open position.
- pilot opening of the exhaust valve is obtained exclusively by the spring of the actuator.
- the pilot opening then the main opening are made on the same valve exhaust or these openings are made on two different valves from the same cylinder. Also, the pilot opening and the main opening can be performed alternately, from one cycle to the next, on a same exhaust valve to distribute the dissipation thermal.
- valve is used to make the opening pilot and the main opening it's not essential, according to another characteristic of the process of the invention, to capture this valve in the position of closure between the two openings, but only to feed the winding for a fraction of time just necessary to maintain an oscillation of the valve, sufficient to make the main opening: just give it speed, during its return movement, without necessarily reaching the closed position, but a position where, if we cut the current, the springs drive it again in the direction of the opening.
- the main opening can be carried out before or after the end of the pilot opening.
- the average energy dissipated in the windings of the corresponding actuators, necessary for the valve control carrying out the main opening is half that corresponding to the solution using a single valve, permanently dedicated to this opening main.
Abstract
Description
La présente invention est relative à un procédé de commande de l'ouverture d'une soupape d'échappement pour un moteur à distribution électromécanique.The present invention relates to a control method the opening of an exhaust valve for a electromechanical distribution.
La mise en oeuvre d'un actionneur électromécanique pour provoquer les mouvements d'ouverture et de fermeture des soupapes dans un moteur à combustion interne, afin de réaliser l'admission et/ou l'échappement des produits de combustion dans les cylindres de ce moteur, constitue une technologie particulièrement bien adaptée, permettant d'obtenir des gains significatifs en ce qui concerne la consommation en carburant du moteur et ses performances, en réduisant en outre la pollution par les gaz brûlés rejetés dans l'atmosphèreThe implementation of an electromechanical actuator for cause the opening and closing movements of valves in an internal combustion engine, in order to carry out the admission and / or exhaust of combustion in the cylinders of this engine, constitutes a particularly well adapted technology, allowing achieve significant gains with respect to the engine fuel consumption and performance, further reducing pollution from exhaust gases in the air
De tels actionneurs électromécaniques permettent en particulier d'obtenir un ajustement variable des angles, c'est-à-dire des instants d'ouverture et de fermeture de chaque soupape en fonction des conditions d'utilisation du moteur, notamment pour optimiser le rendement énergétique de celui-ci.Such electromechanical actuators allow particular to obtain a variable adjustment of the angles, that is to say instants of opening and closing of each valve according to the conditions of use of the engine, in particular to optimize fuel efficiency of it.
Il est également connu d'utiliser, de façon plus perfectionnée pour constituer un tel actionneur, un ensemble électromagnétique associé à chaque tige de soupape.It is also known to use, in a more improved to constitute such an actuator, a electromagnetic assembly associated with each rod of valve.
De manière résumée à ses éléments essentiels, cet ensemble comporte, associés à la tige de soupape, un ou plusieurs enroulements électromagnétiques définissant un entrefer dont la distance est sensiblement égale à la course de la tête de la soupape, la tige étant solidaire d'un plateau transversal en matériau magnétique, logé dans l'entrefer, de sorte que, selon le courant qui traverse le ou les enroulements, ce plateau soit attiré d'un côté ou de l'autre, de sorte que la soupape passe de sa position d'ouverture à celle de sa fermeture, le plateau oscillant de part et d'autre d'une position d'équilibre intermédiaire.Summarized in its essential elements, this set comprises, associated with the valve stem, one or more electromagnetic windings defining an air gap whose distance is substantially equal to the stroke of the valve head, the rod being integral with a plate transverse in magnetic material, housed in the air gap, so that depending on the current flowing through the coils, this tray is drawn to one side or the other, so that the valve moves from its position from opening to closing, the swash plate on either side of an equilibrium position intermediate.
On notera que, le plus souvent, la soupape est commandée par deux électroaimants. Cependant, on connaít des systèmes permettant d'obtenir le même résultat avec un seul enroulement, grâce à une géométrie particulière de l'armature de l'électroaimant correspondant.It will be noted that, most often, the valve is controlled by two electromagnets. However, we know systems allowing to obtain the same result with only one winding, thanks to a particular geometry of the armature of the corresponding electromagnet.
La tige de soupape est également associée à des ressorts travaillant respectivement et simultanément en compression et en extension ou vice versa selon le cas, en particulier selon le sens de déplacement de cette tige de soupape, à l'ouverture ou à la fermeture, l'effet de ces ressorts s'ajoutant à celui de la force d'attraction électromagnétique exercée sur le plateau transversal.The valve stem is also associated with springs working respectively and simultaneously in compression and in extension or vice versa as appropriate, in particular depending on the direction of movement of this valve stem, at opening or closing, the effect of these springs adding to that of the force of attraction electromagnetic exerted on the transverse plate.
En jouant sur l'intensité du courant dans le ou les enroulements, on peut ainsi, de manière simple, ajuster la vitesse de la tige de soupape dans sa course et la faire varier en fonction des besoins.By varying the intensity of the current in the windings, you can easily adjust the speed of the valve stem in its stroke and make it vary as needed.
Les Figures 1a, 1b et 1c illustrent schématiquement un dispositif connu de ce genre. Figures 1a, 1b and 1c schematically illustrate a known device of this kind.
Sur ces figures, qui représentent en élévation le
dispositif de commande précité, la référence 1 désigne une
tige illustrée en position verticale qui comporte à son
extrémité inférieure une tête de soupape 2 et à son
extrémité opposée une portée d'appui 3 pour un ressort 4,
monté entre cette portée et une butée fixe 5.In these figures, which show in elevation the
above-mentioned control device, reference 1 designates a
rod illustrated in vertical position which has at its
lower end a
La tige 1 comporte du côté de la tête de soupape 2 une
autre portée d'appui 6 pour un second ressort 7, monté
entre cette portée et un guide fixe 8 présentant un alésage
traversant 9 dans lequel coulisse, selon un mouvement de
va-et-vient, l'extrémité correspondante de la tige 1.The rod 1 has on the side of the valve head 2 a
Cette tige est par ailleurs équipée, entre les portées
d'appui 3 et 6 des ressorts 4 et 7, d'un plateau
transversal 10 qui, si la tige est verticale, s'étend
horizontalement, ce plateau étant monté dans un entrefer 11
ménagé entre deux électroaimants, respectivement 12 et 13,
chacun de ces électroaimants comportant une culasse 14 en
matériau magnétique et un enroulement électrique 15, de
sorte que le passage d'un courant dans les enroulements des
deux électroaimants provoque sur le plateau 10 un effet
d'attraction par l'un de ces électroaimants et de répulsion
par l'autre, la tête de soupape 2 oscillant ainsi entre
deux positions où le plateau est au contact de l'un ou de
l'autre des électroaimants.This rod is also equipped, between the spans
support 3 and 6 of
La Figure 1a illustre la position d'équilibre de l'ensemble
ainsi envisagé, dans laquelle le plateau 10 est
sensiblement au milieu de l'entrefer 11 entre les deux
électroaimants 12 et 13, la Figure 1b représentant la
position où ce plateau s'est déplacé pour être au contact
de l'électroaimant 12 et la Figure 1c celle où, à
l'inverse, le plateau est appliqué contre l'électroaimant
13.Figure 1a illustrates the equilibrium position of the assembly
thus envisaged, in which the
Au cours des déplacements du plateau 10, de part et d'autre
de sa position d'équilibre intermédiaire, les ressorts 4 et
7 se sont respectivement contractés ou étirés, ou
inversement, les deux positions atteintes par la tête de
soupape, représentées sur les figures 1b et 1c
correspondant pour la première à celle où la soupape est
supposée fermée en s'appliquant sur un siège (non
représenté) et pour la seconde à celle où la soupape est
ouverte.During the movements of the
Le fonctionnement d'un tel ensemble actionneur est
relativement simple, les moyens nécessaires pour faire
osciller le plateau 10 porté par la tige 1 de part et
d'autre de sa position d'équilibre ne présentant pas de
difficultés majeures pour être réalisés industriellement.The operation of such an actuator assembly is
relatively simple, the means necessary to make
oscillate the
D'autres perfectionnements à ce dispositif connu ont été par ailleurs décrits et revendiqués dans la demande de brevet français n° 99 09618 du 23 juillet 1999 pour un "Dispositif de contrôle et de limitation d'impact pour un actionneur électromécanique", et également dans la demande 00 01321 du 2 février 2000 pour un "Dispositif pour contrôler et réduire la vitesse d'impact d'un actionneur électromécanique", l'une et l'autre au nom de la demanderesse, en vue notamment de limiter le bruit créé par le plateau qui est accéléré en fin de course et qui présente de ce fait, au moment de l'impact final sur l'électroaimant lorsque la soupape s'ouvre ou se ferme, une vitesse relativement élevée.Other improvements to this known device have been further described and claimed in the application for French patent n ° 99 09618 of July 23, 1999 for a "Control and impact limitation device for a electromechanical actuator ", and also in the application 00 01 321 of February 2, 2000 for a "Device for control and reduce the impact speed of an actuator electromechanical ", both in the name of plaintiff, in particular with a view to limiting the noise created by the plateau which is accelerated at the end of the race and which therefore, at the time of the final impact on the solenoid when the valve opens or closes, a relatively high speed.
Mais si ces réalisations d'un actionneur électromécanique sont satisfaisantes pour atteindre le but plus spécialement visé lorsqu'il s'agit d'une soupape d'admission, en particulier pour obtenir le maintien de cette soupape dans ses positions extrêmes, ouverte ou fermée, grâce à la fourniture à l'électroaimant de l'énergie nécessaire pour assurer la compensation des frottements du mécanisme, elles se heurtent à un inconvénient lorsqu'il s'agit de commander une soupape d'échappement. But if these achievements of an electromechanical actuator are satisfactory for achieving the goal more specifically referred in the case of an intake valve, in particular to obtain the maintenance of this valve in its extreme positions, open or closed, thanks to the supply to the electromagnet of the energy necessary for compensate for friction of the mechanism, they come up against a drawback when it comes to ordering an exhaust valve.
En effet, pour ouvrir celle-ci, il est nécessaire de lutter contre la pression des gaz brûlés dans le cylindre, qui produisent un effort sur la soupape et la ralentissent de manière d'autant plus importante que cette pression est plus élevée, donc que le couple délivré par le moteur est plus important.Indeed, to open it, it is necessary to fight against the pressure of the burnt gases in the cylinder, which produce a force on the valve and slow it down all the more important as this pressure is higher, so that the torque delivered by the motor is most important.
Il en résulte que le travail mécanique à fournir par l'électroaimant pour permettre la capture, c'est-à-dire l'immobilisation en position extrême ouverte de la tête de la soupape, augmente proportionnellement à la pression des gaz. Or, le seul moyen d'augmenter ce travail est de produire un effort plus important pendant un temps plus long, ce qui revient à accroítre le courant dans l'enroulement de l'électroaimant.It follows that the mechanical work to be provided by the electromagnet to allow the capture, that is to say immobilization in the extreme open position of the head of the valve increases in proportion to the pressure of the gas. The only way to increase this work is to produce a greater effort for a longer time long, which amounts to increasing the current in the coil of the electromagnet.
Il en résulte également que la puissance consommée par cet enroulement augmente rapidement avec la pression des gaz dans le cylindre du moteur, ce qui a des conséquences immédiates sur l'importance des moyens à mettre en oeuvre pour assurer le refroidissement de cet enroulement et conduit à une consommation électrique plus élevée et à un coût de fabrication également plus important.It also follows that the power consumed by this winding increases rapidly with gas pressure in the engine cylinder, which has consequences immediate on the importance of the means to be implemented to ensure the cooling of this winding and leads to higher power consumption and manufacturing cost also higher.
Enfin, on peut souligner que le travail mécanique que l'actionneur est susceptible de fournir n'est pas illimité, ce qui restreint en partie le domaine de fonctionnement du moteur.Finally, we can emphasize that the mechanical work that the actuator is likely to supply is not unlimited, which partially restricts the area of operation of the engine.
Diverses solutions ont déjà été proposées pour atténuer les inconvénients ainsi exposés, ces solutions visant à augmenter la taille de l'actionneur, avec comme corollaire un accroissement du refroidissement nécessaire, ou inversement, à diminuer la dimension des soupapes d'échappement pour réduire les efforts dûs à la pression du gaz, ce qui s'effectue au détriment des performances du moteur. Various solutions have already been proposed to mitigate the disadvantages thus exposed, these solutions aimed at increase the size of the actuator, with the corollary increased cooling required, or conversely, to reduce the size of the valves exhaust to reduce the forces due to the pressure of the gas, which occurs at the expense of the performance of the engine.
On peut également créer une dissymétrie dans la répartition et la forme des soupapes d'échappement afin de pouvoir ouvrir plus facilement une petite soupape, puis une soupape plus importante pour conserver la section efficace de passage des gaz. Toutefois, cette solution amène à modifier la forme de la chambre de combustion et à accroítre la masse des pistons pour pouvoir y ménager les embrèvements nécessaires, ce qui là encore augmente le prix de revient.We can also create an asymmetry in the distribution and the shape of the exhaust valves so that more easily open a small valve, then a valve more important to keep the cross section of gas passage. However, this solution leads to modify the shape of the combustion chamber and to increase the mass of pistons to be able to spare footprints necessary, which again increases the cost price.
La présente invention a pour objet un procédé de commande d'ouverture d'une soupape d'échappement à l'aide d'un actionneur électromécanique du genre décrit ci-dessus, qui pallie ces inconvénients.The present invention relates to a control method opening an exhaust valve using a electromechanical actuator of the kind described above, which overcomes these disadvantages.
Selon l'invention, le procédé de commande considéré, pour l'ouverture d'une soupape d'échappement soumise en permanence à l'effet d'un ressort de poussée, se caractérise en ce qu'il consiste à réaliser une décompression du gaz dans le cylindre grâce à une ouverture préalable ou "pilote" de cette soupape, avant que ne soit réalisée une ouverture complète ou "principale".According to the invention, the control method considered, for the opening of an exhaust valve subject to permanence of the effect of a thrust spring, characterized in that it consists in carrying out a gas decompression in the cylinder through an opening prior or "pilot" of this valve, before performed a complete or "main" opening.
Selon l'art antérieur, l'ouverture de la soupape d'échappement se fait d'abord sous l'action des seuls ressorts, puis on alimente le ou les électroaimants pour amener et capturer la soupape en position de pleine ouverture : bien que du gaz ait commencé à s'échapper, la pression reste relativement élevée, ce qui provoque les inconvénients mentionnés ci-dessus.According to the prior art, the opening of the valve exhaust is done first under the action of only springs, then supply the electromagnet (s) to bring and capture the valve in full position opening: although gas has started to escape, the pressure remains relatively high, causing disadvantages mentioned above.
Selon l'invention, on réalise d'abord une ouverture pilote au cours de laquelle la soupape s'ouvre et se ferme sous l'action des seuls ressorts, puis une ouverture dite "ouverture principale" qui se déroule pratiquement comme les ouvertures classiques, avec cette fois capture de la soupape en position de pleine ouverture. According to the invention, a pilot opening is first produced during which the valve opens and closes under the action of the springs alone, then a so-called opening "main opening" which takes place practically as the classic openings, this time capturing the valve in full open position.
Ainsi, lors de l'ouverture pilote, la soupape n'atteint pas sa position de pleine ouverture et n'est pas capturée dans cette position. Cependant, les gaz s'échappant pendant toute la durée de l'ouverture pilote, puis au début de l'ouverture principale, la pression résiduelle est beaucoup plus faible que dans l'art antérieur lorsqu'on alimente l'électroaimant et la consommation d'énergie est plus faible.Thus, during the pilot opening, the valve does not reach its full opening position and is not captured in this position. However, the gases escaping during the entire duration of the pilot opening, then at the start of the main opening, the residual pressure is a lot lower than in the prior art when feeding the electromagnet and the power consumption is more low.
Le procédé selon l'invention n'exige donc pour sa mise en oeuvre qu'une très faible dépense d'énergie globale, le travail mécanique absorbé par les gaz dans le cylindre étant minimal et en partie compensé par le fait que, lors de l'ouverture pilote, on n'alimente pas l'électroaimant pour capturer la soupape en position ouverte.The method according to the invention therefore does not require for its implementation work that a very low overall energy expenditure, the mechanical work absorbed by the gases in the cylinder being minimal and partly offset by the fact that when of the pilot opening, we do not power the electromagnet to capture the valve in the open position.
Il n'est donc plus nécessaire de surdimensionner l'actionneur ou d'accroítre l'intensité du courant dans l'enroulement, du fait de la réduction de l'effort résistant dû aux gaz, en raison de la décompression créée dans le cylindre.It is therefore no longer necessary to oversize the actuator or to increase the intensity of the current in the winding, due to the reduction of the effort gas resistant, due to decompression in the cylinder.
Dans un mode de réalisation préféré de l'invention, l'ouverture pilote de la soupape d'échappement est obtenue exclusivement par le ressort de l'actionneur.In a preferred embodiment of the invention, pilot opening of the exhaust valve is obtained exclusively by the spring of the actuator.
Selon diverses variantes, l'ouverture pilote puis l'ouverture principale sont réalisées sur la même soupape d'échappement ou bien ces ouvertures sont effectuées sur deux soupapes différentes du même cylindre. Également, l'ouverture pilote et l'ouverture principale peuvent être réalisées alternativement, d'un cycle sur l'autre, sur une même soupape d'échappement afin de répartir la dissipation thermique.According to various variants, the pilot opening then the main opening are made on the same valve exhaust or these openings are made on two different valves from the same cylinder. Also, the pilot opening and the main opening can be performed alternately, from one cycle to the next, on a same exhaust valve to distribute the dissipation thermal.
Si la même soupape est utilisée pour réaliser l'ouverture pilote et l'ouverture principale, il n'est pas indispensable, selon une autre caractéristique du procédé de l'invention, de capturer cette soupape en position de fermeture entre les deux ouvertures, mais seulement d'alimenter l'enroulement pendant une fraction de temps juste nécessaire pour entretenir une oscillation de la soupape, suffisante pour réaliser l'ouverture principale : il suffit de lui redonner de la vitesse, au cours de son mouvement de retour, sans atteindre nécessairement la position de fermeture, mais une position où, si on coupe le courant, les ressorts l'entraínent à nouveau dans le sens de l'ouverture.If the same valve is used to make the opening pilot and the main opening it's not essential, according to another characteristic of the process of the invention, to capture this valve in the position of closure between the two openings, but only to feed the winding for a fraction of time just necessary to maintain an oscillation of the valve, sufficient to make the main opening: just give it speed, during its return movement, without necessarily reaching the closed position, but a position where, if we cut the current, the springs drive it again in the direction of the opening.
Selon le cas, l'ouverture principale peut être réalisée avant ou après la fin de l'ouverture pilote.Depending on the case, the main opening can be carried out before or after the end of the pilot opening.
L'invention sera mieux comprise à l'aide de l'exemple de mise en oeuvre du procédé de l'invention, schématisé par le diagramme illustré sur la Figure 2 du dessin annexé, qui porte en abscisses une échelle de temps, et qui représente en ordonnées, à la fois la pression du gaz dans le cylindre et la position de la ou des soupapes d'échappement.The invention will be better understood using the example of implementation of the process of the invention, shown schematically by the diagram illustrated in Figure 2 of the accompanying drawing, which has a time scale on the abscissa and represents on the ordinate, both the pressure of the gas in the cylinder and the position of the exhaust valve (s).
On voit ainsi que lors de l'ouverture pilote, schématisée par la courbe (a), la pression des gaz dans le cylindre, représentée par la courbe (b), chute rapidement, permettant de réaliser dans les conditions mentionnées plus haut l'ouverture principale de la même ou d'une soupape différente, cette ouverture principale correspondant à la courbe (c).We can thus see that during the pilot opening, diagrammatically by curve (a), the pressure of the gases in the cylinder, represented by curve (b), drops rapidly, allowing to carry out under the conditions mentioned above the main opening of the same or a valve different, this main opening corresponding to the curve (c).
Bien entendu, ce diagramme ne correspond qu'à un mode de réalisation particulier et se différencie nécessairement d'une variante à l'autre, le recoupement des courbes (a) et (c) pouvant être différent.Of course, this diagram only corresponds to a mode of particular achievement and necessarily differentiates from one variant to another, the intersection of the curves (a) and (c) may be different.
Dans le cas où le moteur comporte plusieurs soupapes d'échappement pour chaque cylindre, lorsque ces soupapes réalisent alternativement l'ouverture pilote et l'ouverture principale, l'énergie moyenne dissipée dans les enroulements des actionneurs correspondants, nécessaire à la commande de la soupape réalisant l'ouverture principale, est moitié de celle qui correspond à la solution utilisant une soupape unique, en permanence dédiée à cette ouverture principale.If the engine has several valves exhaust for each cylinder, when these valves alternate between pilot opening and opening main, the average energy dissipated in the windings of the corresponding actuators, necessary for the valve control carrying out the main opening, is half that corresponding to the solution using a single valve, permanently dedicated to this opening main.
Dans tous les cas, l'énergie nécessaire est notablement plus faible que dans la solution classique, ce qui réduit l'effort à vaincre du fait des gaz d'échappement, restreint considérablement la consommation électrique nécessaire et l'échauffement des actionneurs, ces trois facteurs permettant de limiter l'encombrement, le poids et le coût du mécanisme, en simplifiant en outre son implantation dans la culasse.In all cases, the energy required is notably lower than in the conventional solution, which reduces the effort to be overcome due to the exhaust gases, restricted considerably the necessary electrical consumption and the heating of the actuators, these three factors to limit the size, weight and cost of the mechanism, further simplifying its implementation in the breech.
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0001492 | 2000-02-07 | ||
| FR0001492A FR2804716B1 (en) | 2000-02-07 | 2000-02-07 | METHOD FOR CONTROLLING THE OPENING OF AN EXHAUST VALVE FOR AN ELECTROMECHANICAL VALVE ENGINE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1138884A1 true EP1138884A1 (en) | 2001-10-04 |
| EP1138884B1 EP1138884B1 (en) | 2019-01-30 |
Family
ID=8846720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01400292.7A Expired - Lifetime EP1138884B1 (en) | 2000-02-07 | 2001-02-06 | Method for the pilot opening of an exhaust gas valve of an engine with an electromechanical valve mechanism |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1138884B1 (en) |
| FR (1) | FR2804716B1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3403242A1 (en) * | 1984-01-31 | 1985-08-01 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Cam drive with a roller tappet |
| EP0471614A1 (en) * | 1990-08-17 | 1992-02-19 | Regie Nationale Des Usines Renault S.A. | Valve actuating device, particularly in an internal combustion engine |
| US5129369A (en) * | 1989-12-20 | 1992-07-14 | Isuzu Ceramics Research Institute Co., Ltd. | Electromagnetic valve control system |
| US5765513A (en) * | 1996-11-12 | 1998-06-16 | Ford Global Technologies, Inc. | Electromechanically actuated valve |
| DE19733140A1 (en) | 1997-07-31 | 1999-02-04 | Fev Motorentech Gmbh & Co Kg | Operating method for electromagnetic actuator on piston engine |
| DE19810609A1 (en) * | 1998-03-12 | 1999-09-16 | Lsp Innovative Automotive Sys | Electromagnetic positioning device for actuating a valve in an internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09317419A (en) * | 1996-05-28 | 1997-12-09 | Toyota Motor Corp | Malfunction detection method for electromagnetically driven intake and exhaust valve |
-
2000
- 2000-02-07 FR FR0001492A patent/FR2804716B1/en not_active Expired - Fee Related
-
2001
- 2001-02-06 EP EP01400292.7A patent/EP1138884B1/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3403242A1 (en) * | 1984-01-31 | 1985-08-01 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Cam drive with a roller tappet |
| US5129369A (en) * | 1989-12-20 | 1992-07-14 | Isuzu Ceramics Research Institute Co., Ltd. | Electromagnetic valve control system |
| EP0471614A1 (en) * | 1990-08-17 | 1992-02-19 | Regie Nationale Des Usines Renault S.A. | Valve actuating device, particularly in an internal combustion engine |
| US5765513A (en) * | 1996-11-12 | 1998-06-16 | Ford Global Technologies, Inc. | Electromechanically actuated valve |
| DE19733140A1 (en) | 1997-07-31 | 1999-02-04 | Fev Motorentech Gmbh & Co Kg | Operating method for electromagnetic actuator on piston engine |
| DE19810609A1 (en) * | 1998-03-12 | 1999-09-16 | Lsp Innovative Automotive Sys | Electromagnetic positioning device for actuating a valve in an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2804716B1 (en) | 2002-05-10 |
| EP1138884B1 (en) | 2019-01-30 |
| FR2804716A1 (en) | 2001-08-10 |
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