EP1174596A1 - Electromagnetic valve actuator in an internal combustion engine - Google Patents
Electromagnetic valve actuator in an internal combustion engine Download PDFInfo
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- EP1174596A1 EP1174596A1 EP01401949A EP01401949A EP1174596A1 EP 1174596 A1 EP1174596 A1 EP 1174596A1 EP 01401949 A EP01401949 A EP 01401949A EP 01401949 A EP01401949 A EP 01401949A EP 1174596 A1 EP1174596 A1 EP 1174596A1
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- Prior art keywords
- electromagnet
- valve
- permanent magnet
- actuator
- magnetization
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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 valve actuators of internal combustion engines.
- a valve actuator of the aforementioned type generally comprises two electromagnets between which is provided an air gap.
- a magnetic pallet linked to the valve actuated, movable by electromagnets against storage springs energy.
- the arrangement thus formed forms a harmonic oscillator in which stores the energy required for rapid switching by the springs and the change of position is controlled using the electromagnets.
- the valve position is checked by means of the two coils of electromagnets by application of current which generates a field magnetic producing a force F.
- this force is proportional to the square of the current injected in the coils and inversely proportional to the square of the air gap.
- This force is also very sensitive to the current injected into the coils.
- the electromagnet can only attract the pallet or plate because the reversal of the direction of the current in the supply coils does not change the direction of the force exerted on the pallet, because this force is a function of the square I 2 current in the coils.
- the force curve of a conventional actuator is therefore well suited to holding the valve in the closed or open position, but it is not suitable when carrying out work over the entire stroke of the valve.
- the actuator On admission, the actuator must be able to provide the necessary energy at switching. This is to compensate for friction losses which rise at about 0.2 J for an 8 mm stroke or lift of the valve, and by therefore from the range of electromagnets.
- the energy provided by an electromagnet throughout the race above, is equal to the integral of the force.
- the useful power would be 20 W, which is low compared to its mass, of the order of 1 kg and its large volume.
- the energy to be supplied is around 1.4 J to fight against pressure in the cylinder chamber when opening the valve.
- the current actuator has a low power density which limits its use to the control of the intake valves of engines of unit displacement greater than or equal to 500 cm 3 .
- the efficiency of an actuator is the ratio between mechanical energy returned (useful) and the electrical energy consumed. It is around 30%, losses being due mainly to induced currents and losses by effect Joule.
- An engine revolution has a duration of 60 ms at 1000 rpm, while a valve transition takes approximately 3.5 ms. We can see that at low speed, the system statistically very often in a stable position, either open or closed.
- the actuator lends itself well to this operation, since the force produced by the electromagnet is naturally raised to zero air gap.
- the consumption of electric current weighs heavily in the calculation of the consumption of the vehicle which is done at an average speed of 1600 RPM approximately, representative of the actual use of vehicles which contains a lot driving at low engine speeds.
- 100 W electrical requires approximately 200 W for the internal combustion engine, approximately 1.5% of fuel consumption per cycle.
- the engine thus forms a complementary parking brake that some users use as an additional brake to the handbrake, in particular in the ribs.
- valves When using electromagnetic actuators, the valves are in an equilibrium position in the middle, so that all the engine chambers are at atmospheric pressure and there is no more additional braking possible.
- the actuator itself is relatively inexpensive due to its simplicity, but the associated control electronics as well as the valve position, are complex and therefore expensive.
- the invention aims to remedy the drawbacks of electromagnetic actuators classics by creating an actuator, which while being priced at comes relatively low, has improved performance in areas mentioned above.
- an electromagnetic valve actuator internal combustion engine comprising an electromagnet comprising a coil supply, a magnetic pallet linked to a drive member of the valve against the action of at least one energy storage spring of switching of said valve, characterized in that in the magnetic body of the electromagnet is interposed a permanent magnet whose magnetization combines to the field generated in said body by said supply coil.
- the actuator shown in FIG. 1 comprises an electromagnet 1 of which the body of magnetic material, for example of laminated sheet metal, carries a coil supply 2.
- the body comprises two pole pieces 3,4 joined together by a permanent magnet 5 surrounded by the power coil 2.
- the magnetization of the permanent magnet 5 is in the present parallel example to the field generated by the supply coil 2 in the magnetic body of the electromagnet.
- Each pole piece 3,4 of the magnetic body has a portion 6.7 perpendicular to the permanent magnet 5.
- Each of the portions 6.7 has a first branch of short length 8.9, straight and a second branch longer, L-shaped, 10.11 whose free end is aligned with the free end correspondent of the respective branch 8.9.
- the stem 16 and the stem of the valve 17 are surrounded by springs helical 18,19 arranged on either side of the magnetic plate 15, and taking support respectively between the corresponding face of said plate and the magnetic body of the electromagnet 1 with regard to the spring 18 and the wall of cylinder head C with regard to spring 19.
- the actuator comprises an inclined permanent magnet 20, disposed between two pole pieces 21, 22 having inclined ends in contact with the side faces of the magnet 20, the magnet 20 and the ends of the pole pieces 21,22 being surrounded by a supply coil 23.
- the direction of the magnetization is inclined relative to the field generated by the supply coil 23.
- the supply of the coil 2 causes the creation in the body of the electromagnet of an electromagnetic field parallel to the direction of magnetization of the permanent magnet and which combines with said magnetization.
- the pallet is moved up or down, causing it to close or open of the valve 17 and the compression of the corresponding spring 18 or 19.
- the pallet 15 is held in position by the permanent magnet 5 alone, ie without current consumption.
- a single electromagnet provides in combination with the two energy storage springs 18,19, the movement of the valve 17 in the direction of opening and closing.
- the associated spring 18.19 causes the displacement of the pallet 15 to from its points of contact with branches 8.9 to its points of contact with the branches 10,11 of the magnetic circuit of the electromagnet or vice versa.
- the power consumption required for switching is also reduced by the reduction of losses by Joule effect.
- the oblique arrangement of the magnet further reduces the size.
Abstract
Description
La présente invention est relative aux actionneurs de soupapes de moteurs à combustion interne.The present invention relates to valve actuators of internal combustion engines.
Un actionneur de soupape du type précité comporte généralement deux électroaimants entre lesquels est ménagé un entrefer.A valve actuator of the aforementioned type generally comprises two electromagnets between which is provided an air gap.
Dans l'entrefer est montée une palette magnétique liée à la soupape à actionner, déplaçable par les électroaimants à l'encontre de ressorts de stockage d'énergie.In the air gap is mounted a magnetic pallet linked to the valve actuated, movable by electromagnets against storage springs energy.
L'agencement ainsi constitué forme un oscillateur harmonique dans lequel le stockage de l'énergie nécessaire à une commutation rapide est assuré par les ressorts et le changement de position est contrôlé à l'aide des électroaimants.The arrangement thus formed forms a harmonic oscillator in which stores the energy required for rapid switching by the springs and the change of position is controlled using the electromagnets.
Ce système est simple en apparence, mais il présente des limitations techniques.This system is simple in appearance, but it has limitations techniques.
Le contrôle de la position de la soupape est assuré au moyen des deux bobines des électroaimants par application de courant qui génère un champ magnétique produisant une force F.The valve position is checked by means of the two coils of electromagnets by application of current which generates a field magnetic producing a force F.
Dans la phase de saturation, cette force est constante et non contrôlable par le courant.In the saturation phase, this force is constant and cannot be controlled by the current.
Hors saturation, cette force est proportionnelle au carré du courant injecté dans les bobines et inversement proportionnelle au carré de l'entrefer.Excluding saturation, this force is proportional to the square of the current injected in the coils and inversely proportional to the square of the air gap.
Cette double non linéarité rend très difficile le contrôle de la soupape par les électroaimants.This double non-linearity makes it very difficult to control the valve by electromagnets.
Pour des petites valeurs d'entrefer entre la palette et l'électroaimant, la force produite par les électroaimants varie très fortement avec l'entrefer.For small air gap values between the paddle and the electromagnet, the force produced by the electromagnets varies very strongly with the air gap.
Cette force est également très sensible au courant injecté dans les bobines.This force is also very sensitive to the current injected into the coils.
A l'approche du contact entre la palette et l'électroaimant, il se produit un effet d'emballement qui génère un claquage responsable du bruit des actionneurs.When approaching the contact between the paddle and the electromagnet, it occurs a runaway effect which generates a breakdown responsible for the noise of the actuators.
Pour pallier cet inconvénient, des solutions sophistiquées et coûteuses mettant en oeuvre notamment le contrôle en boucle fermée de la position de la palette ont été envisagées.To overcome this drawback, sophisticated and expensive solutions implementing in particular closed-loop control of the position of the palette were considered.
L'électroaimant ne peut qu'attirer la palette ou plateau car l'inversion du sens du courant dans les bobines d'alimentation ne change pas le sens de la force exercée sur la palette, du fait que cette force est fonction du carré I2 du courant dans les bobines.The electromagnet can only attract the pallet or plate because the reversal of the direction of the current in the supply coils does not change the direction of the force exerted on the pallet, because this force is a function of the square I 2 current in the coils.
Ceci constitue une difficulté supplémentaire pour le contrôle de l'accostage, car si on apporte trop d'énergie à la palette, il n'est plus possible de le ralentir et le choc avec le corps de l'électroaimant est inévitable.This constitutes an additional difficulty for controlling docking, because if you add too much energy to the palette, it is no longer possible to slow down and shock with the electromagnet body is inevitable.
Pour des entrefers supérieurs à 1 mm, la force développée par l'électroaimant devient faible.For air gaps greater than 1 mm, the force developed by the electromagnet becomes weak.
La courbe d'effort d'un actionneur classique est donc bien adaptée au maintien de la soupape en position fermée ou ouverte, mais elle n'est pas adaptée à la réalisation d'un travail sur toute la course de la soupape.The force curve of a conventional actuator is therefore well suited to holding the valve in the closed or open position, but it is not suitable when carrying out work over the entire stroke of the valve.
On constate cette insuffisance quand on veut actionner des soupapes d'échappement car, pour un moteur chaud, l'actionneur doit alors fournir une énergie mécanique supérieure à 1 Joule à chaque transition, contre 0,2 Joule à l'admission.We see this insufficiency when we want to operate valves exhaust because, for a hot engine, the actuator must then provide a mechanical energy greater than 1 Joule at each transition, against 0.2 Joule at admission.
De plus, il est toujours difficile d'initialiser des soupapes car à l'arrêt, l'entrefer entre la palette d'actionnement et le corps de l'électroaimant est de 4 mm.In addition, it is always difficult to initialize valves because when stopped, the air gap between the actuating paddle and the body of the electromagnet is 4 mm.
A ce problème relatif à la force s'ajoute la présence importante des courants de Foucault qui atténuent et retardent l'effet des bobines.To this problem relating to force is added the significant presence of Eddy currents which attenuate and delay the effect of the coils.
A l'admission, l'actionneur doit être capable d'apporter l'énergie nécessaire à la commutation. Il s'agit de compenser les pertes par frottement qui s'élèvent à 0,2 J environ pour une course ou levée de 8 mm de la soupape, et par conséquent de la palette des électroaimants.On admission, the actuator must be able to provide the necessary energy at switching. This is to compensate for friction losses which rise at about 0.2 J for an 8 mm stroke or lift of the valve, and by therefore from the range of electromagnets.
L'énergie apportée par un électroaimant sur l'ensemble de la course précitée, est égale à l'intégrale de la force.The energy provided by an electromagnet throughout the race above, is equal to the integral of the force.
Cette énergie est relativement faible en raison de la forte décroissance de la force pour les grandes valeurs d'entrefer.This energy is relatively low due to the strong decrease strength for the great air gap values.
Par exemple, à une vitesse de rotation du moteur de 6000 t/mn, sur un cycle à deux temps, qui optimiserait l'utilisation de l'actionneur, la puissance utile serait de 20 W, ce qui est faible en regard de sa masse, de l'ordre de 1 kg et de son gros volume.For example, at an engine speed of 6000 rpm, on a two-stroke cycle, which would optimize the use of the actuator, the useful power would be 20 W, which is low compared to its mass, of the order of 1 kg and its large volume.
Pour un moteur thermique de 500 cm3 de cylindrée unitaire, on peut se satisfaire de telles dimensions bien qu'elles restent un handicap. For a heat engine of 500 cm 3 of unit displacement, one can be satisfied with such dimensions although they remain a handicap.
Par contre, ces dimensions ne sont pas compatibles avec des cylindrées unitaires plus faibles.However, these dimensions are not compatible with displacements weaker units.
A l'échappement, l'énergie à fournir est de l'ordre de 1,4 J pour lutter contre la pression dans la chambre du cylindre lors de l'ouverture de la soupape.At the exhaust, the energy to be supplied is around 1.4 J to fight against pressure in the cylinder chamber when opening the valve.
On a constaté lors d'essais que les actionneurs actuels sont insuffisants à l'échappement et ne permettent pas de faire fonctionner le moteur à pleine charge.It was found during tests that the current actuators are insufficient exhaust and do not allow the engine to run at full load.
En conclusion, l'actionneur actuel a une puissance volumique faible qui limite son utilisation à la commande des soupapes d'admission de moteurs de cylindrée unitaire supérieure ou égale à 500 cm3.In conclusion, the current actuator has a low power density which limits its use to the control of the intake valves of engines of unit displacement greater than or equal to 500 cm 3 .
Le rendement d'un actionneur est le rapport entre l'énergie mécanique restituée (utile) et l'énergie électrique consommée. Il est de l'ordre de 30%, les pertes étant dues principalement aux courants induits et aux pertes par effet Joule.The efficiency of an actuator is the ratio between mechanical energy returned (useful) and the electrical energy consumed. It is around 30%, losses being due mainly to induced currents and losses by effect Joule.
Un tour de moteur a une durée de 60 ms à 1000 t/mn, alors qu'une transition de soupape dure environ 3,5 ms. On voit bien qu'à bas régime, le système est statistiquement très souvent dans une position stable, soit ouverte, soit fermée.An engine revolution has a duration of 60 ms at 1000 rpm, while a valve transition takes approximately 3.5 ms. We can see that at low speed, the system statistically very often in a stable position, either open or closed.
Pour maintenir la soupape dans la position ouverte ou fermée, on applique un courant dans la bobine du côté concerné, afin de lutter contre la force du ressort qui tend à ramener la soupape en position intermédiaire.To keep the valve in the open or closed position, apply a current in the coil on the side concerned, in order to fight against the force of the spring which tends to return the valve to the intermediate position.
L'actionneur se prête bien à ce fonctionnement, puisque la force produite par l'électroaimant est naturellement élevée à entrefer nul.The actuator lends itself well to this operation, since the force produced by the electromagnet is naturally raised to zero air gap.
Toutefois, la consommation de courant électrique pèse lourd dans le calcul de la consommation du véhicule qui se fait à un régime moyen de 1600 t/mn environ, représentatif de l'utilisation réelle des véhicules qui contient beaucoup de conduite urbaine à faible régime du moteur.However, the consumption of electric current weighs heavily in the calculation of the consumption of the vehicle which is done at an average speed of 1600 RPM approximately, representative of the actual use of vehicles which contains a lot driving at low engine speeds.
A titre d'exemple, 100 W électriques nécessitent environ 200 W pour le moteur thermique, soit environ 1,5% de la consommation de carburant par cycle.For example, 100 W electrical requires approximately 200 W for the internal combustion engine, approximately 1.5% of fuel consumption per cycle.
Or, la consommation de maintien pourrait être théoriquement nulle puisqu'elle ne produit aucun travail.However, maintenance consumption could be theoretically zero since it produces no work.
Les actionneurs actuels présentent une hauteur relativement importante en raison de l'empilage de ressorts, de deux électroaimants et d'un plateau d'actionnement ou palette. Current actuators have a relatively large height due to stacking of springs, two electromagnets and a plate actuator or pallet.
En stationnement, sur les moteurs des véhicules actuels, il y a toujours un cylindre en compression.When parked, on the engines of current vehicles, there is always a cylinder in compression.
Le moteur forme ainsi un frein de parcage complémentaire que certains utilisateurs exploitent comme frein additionnel au frein à main, notamment dans les côtes.The engine thus forms a complementary parking brake that some users use as an additional brake to the handbrake, in particular in the ribs.
Lorsqu'on utilise les actionneurs électromagnétiques, les soupapes sont en position d'équilibre au milieu, de sorte que toutes les chambres du moteur sont à la pression atmosphérique et il n'y a plus de freinage complémentaire possible.When using electromagnetic actuators, the valves are in an equilibrium position in the middle, so that all the engine chambers are at atmospheric pressure and there is no more additional braking possible.
Enfin, l'actionneur lui-même est relativement bon marché en raison de sa simplicité, mais l'électronique de commande associée ainsi que le capteur de position de la soupape, sont complexes et donc chers.Finally, the actuator itself is relatively inexpensive due to its simplicity, but the associated control electronics as well as the valve position, are complex and therefore expensive.
L'invention vise à remédier aux inconvénients des actionneurs électromagnétiques classiques en créant un actionneur, qui tout en étant d'un prix de revient relativement peu élevé, présente des performances améliorées dans les domaines évoqués plus haut.The invention aims to remedy the drawbacks of electromagnetic actuators classics by creating an actuator, which while being priced at comes relatively low, has improved performance in areas mentioned above.
Elle a donc pour objet un actionneur électromagnétique de soupape de moteur à combustion interne comprenant un électroaimant comportant une bobine d'alimentation, une palette magnétique liée à un organe d'entraínement de la soupape à l'encontre de l'action d'au moins un ressort de stockage d'énergie de commutation de ladite soupape, caractérisé en ce que dans le corps magnétique de l'électroaimant est interposé un aimant permanent dont l'aimantation se combine au champ engendré dans ledit corps par ladite bobine d'alimentation.It therefore relates to an electromagnetic valve actuator internal combustion engine comprising an electromagnet comprising a coil supply, a magnetic pallet linked to a drive member of the valve against the action of at least one energy storage spring of switching of said valve, characterized in that in the magnetic body of the electromagnet is interposed a permanent magnet whose magnetization combines to the field generated in said body by said supply coil.
Suivant d'autres caractéristiques :
- le corps magnétique de l'électroaimant comprenant deux pièces polaires comprenant chacune une première et une seconde branches définissant entre elles des entrefers, ladite palette étant montée déplaçable dans les entrefers définis par les première et seconde branches de deux pièces polaires, ledit aimant permanent est disposé entre lesdites pièces polaires ;
- l'aimant permanent est placé dans le corps de l'électroaimant de manière que son aimantation soit parallèle au champ engendré dans ledit corps par ladite bobine d'alimentation ;
- l'aimant permanent est placé dans le corps de l'électroaimant de manière que son aimantation soit inclinée par rapport au champ engendré dans ledit corps par ladite bobine d'alimentation.
- the magnetic body of the electromagnet comprising two pole pieces each comprising a first and a second branch defining gaps between them, said pallet being mounted movable in the gaps defined by the first and second branches of two pole pieces, said permanent magnet is disposed between said pole pieces;
- the permanent magnet is placed in the body of the electromagnet so that its magnetization is parallel to the field generated in said body by said supply coil;
- the permanent magnet is placed in the body of the electromagnet so that its magnetization is inclined relative to the field generated in said body by said supply coil.
L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :
- la Fig.1 est une vue schématique en coupe d'un actionneur électromagnétique de soupape à un électroaimant suivant l'invention ; et
- la Fig.2 est une vue schématique partielle en coupe d'une variante d'actionneur électromagnétique de soupape suivant l'invention.
- Fig.1 is a schematic sectional view of an electromagnetic valve actuator to an electromagnet according to the invention; and
- Fig.2 is a partial schematic sectional view of an alternative electromagnetic valve actuator according to the invention.
L'actionneur représenté à la figure 1 comporte un électroaimant 1 dont
le corps en matériau magnétique, par exemple en tôles feuilletées porte une bobine
d'alimentation 2.The actuator shown in FIG. 1 comprises an electromagnet 1 of which
the body of magnetic material, for example of laminated sheet metal, carries a
Le corps comporte deux pièces polaires 3,4 réunies entre elles par un
aimant permanent 5 entouré par la bobine d'alimentation 2.The body comprises two
L'aimantation de l'aimant permanent 5 est dans le présent exemple parallèle
au champ engendré par la bobine d'alimentation 2 dans le corps magnétique
de l'électroaimant.The magnetization of the
Chaque pièce polaire 3,4 du corps magnétique comporte une portion
6,7 perpendiculaire à l'aimant permanent 5. Chacune des portions 6,7 comporte
une première branche de faible longueur 8,9, rectiligne et une seconde branche
plus longue, en L, 10,11 dont l'extrémité libre est alignée avec l'extrémité libre
correspondante de la branche 8,9 respective.Each
Entre les branches 8,10 d'une part, et 9,11 d'autre part, sont définis
des entrefers 13,14 dans lesquels est montée déplaçable une palette magnétique
ou plateau 15 fixée à une tige 16 d'entraínement d'une soupape 17.Between the branches 8.10 on the one hand, and 9.11 on the other hand, are defined
La tige 16 et la queue de la soupape 17 sont entourées par des ressorts
hélicoïdaux 18,19 disposés de part et d'autre du plateau magnétique 15, et
prenant appui respectivement entre la face correspondante dudit plateau et le
corps magnétique de l'électroaimant 1 en ce qui concerne le ressort 18 et la paroi
de la culasse C en ce qui concerne le ressort 19.The
Selon la variante représentée en coupe schématique partielle à la figure
2, l'actionneur comprend un aimant permanent 20 incliné, disposé entre
deux pièces polaires 21,22 présentant des extrémités inclinées en contact avec
les faces latérales de l'aimant 20, l'aimant 20 et les extrémités des pièces polaires
21,22 étant entourés par une bobine d'alimentation 23.According to the variant shown in partial schematic section in the figure
2, the actuator comprises an inclined
Ainsi, la direction de l'aimantation est inclinée par rapport au champ
engendré par la bobine d'alimentation 23.Thus, the direction of the magnetization is inclined relative to the field
generated by the
Par ailleurs, l'actionneur de la figure 2 est en tous points semblable à celui de la figure 1 et ne sera donc pas décrit.Furthermore, the actuator of FIG. 2 is in all respects similar to that of FIG. 1 and will therefore not be described.
Le fonctionnement de l'actionneur électromagnétique qui vient d'être décrit en référence à la figure 1 est le suivant.The operation of the electromagnetic actuator which has just been described with reference to Figure 1 is as follows.
L'alimentation de la bobine 2 provoque la création dans le corps de
l'électroaimant d'un champ électromagnétique parallèle à la direction de l'aimantation
de l'aimant permanent et qui se combine avec ladite aimantation.The supply of the
Selon que la palette se trouve près des branches courtes 8,9 ou des
branches longues 10,11 des pièces polaires du corps de l'électroaimant, elle est
déplacée vers le haut ou vers le bas, ce qui provoque la fermeture ou l'ouverture
de la soupape 17 et la compression du ressort 18 ou 19 correspondant.Depending on whether the pallet is near
Le maintien en position de la palette 15 est assuré par l'aimant permanent
5 seul, c'est à dire sans consommation de courant.The
Ainsi, grâce à la construction particulière de l'actionneur, un seul électroaimant
assure en combinaison avec les deux ressorts de stockage d'énergie
18,19, le déplacement de la soupape 17 dans le sens de l'ouverture et de la fermeture.Thanks to the special construction of the actuator, a single electromagnet
provides in combination with the two energy storage springs
18,19, the movement of the
Pour faire passer la palette d'une position à l'autre, on alimente à nouveau la bobine qui engendre une force de libération de la palette.To move the pallet from one position to another, we feed again the coil which generates a force for releasing the pallet.
Le ressort associé 18,19 provoque le déplacement de la palette 15 à
partir de ses points de contact avec les branches 8,9 vers ses points de contact
avec les branches 10,11 du circuit magnétique de l'électroaimant ou inversement.The associated spring 18.19 causes the displacement of the
L'agencement qui vient d'être décrit permet une consommation électrique de maintien de la soupape en position nulle ou très limitée.The arrangement which has just been described allows an electrical consumption holding the valve in the zero or very limited position.
La consommation électrique nécessaire à la commutation est également réduite par la réduction des pertes par effet Joule.The power consumption required for switching is also reduced by the reduction of losses by Joule effect.
Il permet également un meilleur contrôle de la soupape grâce à la linéarité relative de la force en fonction de l'entrefer, ce qui permet d'obtenir un gain en bruit. It also allows better control of the valve thanks to the linearity relative force as a function of the air gap, which makes it possible to obtain a gain in noise.
L'utilisation d'un seul électroaimant réduit considérablement l'encombrement de l'actionneur.The use of a single electromagnet considerably reduces the space requirement of the actuator.
L'agencement oblique de l'aimant permet de réduire encore l'encombrement.The oblique arrangement of the magnet further reduces the size.
Enfin, le fait de pouvoir laisser les soupapes fermées sans consommer de courant améliore encore la possibilité d'utiliser l'actionneur de l'invention comme frein de parcage.Finally, being able to leave the valves closed without consuming current further improves the possibility of using the actuator of the invention as a parking brake.
Il présente une puissance volumique accrue permettant une application à l'échappement et sur des moteurs de plus faible cylindrée unitaire.It has an increased density allowing an application exhaust and on engines with a smaller unit displacement.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0009546A FR2812025B1 (en) | 2000-07-20 | 2000-07-20 | ELECTROMAGNETIC VALVE ACTUATOR OF INTERNAL COMBUSTION ENGINE |
| FR0009546 | 2000-07-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1174596A1 true EP1174596A1 (en) | 2002-01-23 |
| EP1174596B1 EP1174596B1 (en) | 2005-12-21 |
Family
ID=8852749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01401949A Expired - Lifetime EP1174596B1 (en) | 2000-07-20 | 2001-07-19 | Electromagnetic valve actuator in an internal combustion engine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1174596B1 (en) |
| AT (1) | ATE313702T1 (en) |
| DE (1) | DE60116000T2 (en) |
| ES (1) | ES2250321T3 (en) |
| FR (1) | FR2812025B1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2851292A1 (en) * | 2003-02-18 | 2004-08-20 | Peugeot Citroen Automobiles Sa | Electromechanical valve activator for internal combustion engine, has magnet and coil switching magnetic plate between electromagnet adjoining and distant positions following delay controlled by current variation flowing in coil |
| EP1568858A2 (en) * | 2004-02-27 | 2005-08-31 | Peugeot Citroen Automobiles SA | Electromagnetic valve drive for internal combustion engine |
| US7097150B2 (en) | 2003-02-18 | 2006-08-29 | Peugeot Citroen Automobiles Sa | Electromechanical valve control actuator for internal combustion engines and internal combustion engine equipped with such an actuator |
| US7111595B2 (en) | 2003-02-18 | 2006-09-26 | Peugeot Citroen Automobiles Sa | Electromechanical valve control actuator for internal combustion engines |
| US7146943B2 (en) | 2003-02-18 | 2006-12-12 | Peugeot Citroen Automobiles Sa | Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator |
| US7487749B2 (en) | 2003-02-18 | 2009-02-10 | Peugeot Citroen Automobiles Sa | Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7249579B2 (en) | 2004-03-25 | 2007-07-31 | Ford Global Technologies, Llc | Enhanced permanent magnet electromagnetic actuator for an electronic valve actuation system of an engine |
| US7124720B2 (en) | 2004-03-25 | 2006-10-24 | Ford Global Technologies, Llc | Permanent magnet electromagnetic actuator for an electronic valve actuation system of an engine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0034955A1 (en) * | 1980-02-20 | 1981-09-02 | DUCELLIER & Cie | Ignition coil for internal-combustion engines |
| US4829947A (en) * | 1987-08-12 | 1989-05-16 | General Motors Corporation | Variable lift operation of bistable electromechanical poppet valve actuator |
| DE19824537A1 (en) * | 1998-06-03 | 1999-12-09 | Lsp Innovative Automotive Sys | Electromagnetic drive for actuating valve in internal combustion engine |
| JPH11350929A (en) * | 1998-06-11 | 1999-12-21 | Toyota Motor Corp | Electromagnetic valve |
| FR2784222A1 (en) * | 1998-10-06 | 2000-04-07 | Sagem | Electromagnetic actuator for IC engine valve, comprises armature fixed on valve stem, stabilized by springs, which is displaced magnetically between fully open and closed positions |
| EP1010866A2 (en) * | 1998-12-07 | 2000-06-21 | Toyota Jidosha Kabushiki Kaisha | Electromagnetic valve actuator |
-
2000
- 2000-07-20 FR FR0009546A patent/FR2812025B1/en not_active Expired - Fee Related
-
2001
- 2001-07-19 EP EP01401949A patent/EP1174596B1/en not_active Expired - Lifetime
- 2001-07-19 AT AT01401949T patent/ATE313702T1/en not_active IP Right Cessation
- 2001-07-19 DE DE60116000T patent/DE60116000T2/en not_active Expired - Lifetime
- 2001-07-19 ES ES01401949T patent/ES2250321T3/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0034955A1 (en) * | 1980-02-20 | 1981-09-02 | DUCELLIER & Cie | Ignition coil for internal-combustion engines |
| US4829947A (en) * | 1987-08-12 | 1989-05-16 | General Motors Corporation | Variable lift operation of bistable electromechanical poppet valve actuator |
| DE19824537A1 (en) * | 1998-06-03 | 1999-12-09 | Lsp Innovative Automotive Sys | Electromagnetic drive for actuating valve in internal combustion engine |
| JPH11350929A (en) * | 1998-06-11 | 1999-12-21 | Toyota Motor Corp | Electromagnetic valve |
| FR2784222A1 (en) * | 1998-10-06 | 2000-04-07 | Sagem | Electromagnetic actuator for IC engine valve, comprises armature fixed on valve stem, stabilized by springs, which is displaced magnetically between fully open and closed positions |
| EP1010866A2 (en) * | 1998-12-07 | 2000-06-21 | Toyota Jidosha Kabushiki Kaisha | Electromagnetic valve actuator |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 2000, no. 03 30 March 2000 (2000-03-30) * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2851292A1 (en) * | 2003-02-18 | 2004-08-20 | Peugeot Citroen Automobiles Sa | Electromechanical valve activator for internal combustion engine, has magnet and coil switching magnetic plate between electromagnet adjoining and distant positions following delay controlled by current variation flowing in coil |
| EP1450012A1 (en) * | 2003-02-18 | 2004-08-25 | Peugeot Citroen Automobiles SA | Electromechanical valve actuator for internal combustion engine and internal combustion engine having this electromechanical valve actuator |
| US7097150B2 (en) | 2003-02-18 | 2006-08-29 | Peugeot Citroen Automobiles Sa | Electromechanical valve control actuator for internal combustion engines and internal combustion engine equipped with such an actuator |
| US7111595B2 (en) | 2003-02-18 | 2006-09-26 | Peugeot Citroen Automobiles Sa | Electromechanical valve control actuator for internal combustion engines |
| US7146943B2 (en) | 2003-02-18 | 2006-12-12 | Peugeot Citroen Automobiles Sa | Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator |
| US7182051B2 (en) | 2003-02-18 | 2007-02-27 | Peugeot Citroen Automobiles Sa | Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator |
| US7487749B2 (en) | 2003-02-18 | 2009-02-10 | Peugeot Citroen Automobiles Sa | Electromechanical valve actuator for internal combustion engines and internal combustion engine equipped with such an actuator |
| EP1568858A2 (en) * | 2004-02-27 | 2005-08-31 | Peugeot Citroen Automobiles SA | Electromagnetic valve drive for internal combustion engine |
| EP1568858A3 (en) * | 2004-02-27 | 2009-01-21 | Peugeot Citroen Automobiles SA | Electromagnetic valve drive for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1174596B1 (en) | 2005-12-21 |
| FR2812025B1 (en) | 2003-01-24 |
| ES2250321T3 (en) | 2006-04-16 |
| ATE313702T1 (en) | 2006-01-15 |
| DE60116000T2 (en) | 2006-07-27 |
| FR2812025A1 (en) | 2002-01-25 |
| DE60116000D1 (en) | 2006-01-26 |
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