EP2443332B1 - Valve having a motion transforming device - Google Patents

Valve having a motion transforming device Download PDF

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Publication number
EP2443332B1
EP2443332B1 EP10726947.4A EP10726947A EP2443332B1 EP 2443332 B1 EP2443332 B1 EP 2443332B1 EP 10726947 A EP10726947 A EP 10726947A EP 2443332 B1 EP2443332 B1 EP 2443332B1
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EP
European Patent Office
Prior art keywords
valve
valve according
tubular wall
shutter
motor
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EP10726947.4A
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German (de)
French (fr)
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EP2443332A1 (en
Inventor
Laurent Albert
Gabriel Ridolfi
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Valeo Systemes de Controle Moteur SAS
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Valeo Systemes de Controle Moteur SAS
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Publication of EP2443332A1 publication Critical patent/EP2443332A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/12—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/04—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by mechanical control linkages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/105—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F02M26/54—Rotary actuators, e.g. step motors

Definitions

  • the invention relates to the field of motor vehicles.
  • It relates more particularly to an engine control valve provided to manage the circulation of a fluid in a duct connected to the engine of the vehicle.
  • Motor control valves actuated by a rotary motor are known and adapted to move in translation a valve disposed in a conduit and for controlling the passage of fluid in this conduit.
  • These valves comprise an electric motor associated with a gear train for rotating a cam system. The displacement in translation generated allows the drive of the valve in a rectilinear motion.
  • EP 1 375 892 describes such a device.
  • the purpose of the invention is to improve this type of valve by proposing a motor control valve whose control is easier and more robust.
  • the invention provides an engine control valve comprising a rotary actuator, a valve, and a device for transforming movement adapted to transform the rotation of the actuator in translation of the valve, characterized in that the device motion transformation comprises a constant pitch helical link for translational drive of the valve.
  • the translation drive of the valve by the motion transformation device is made according to a substantially linear law, that is to say that the axial force exerted on the valve for its opening undergoes variations, depending on the valve lift and therefore the rotation of the actuator, which can be represented by a substantially straight line.
  • This does not allow to obtain a significant reduction in the force applied to the valve from the beginning of the valve lift phase (where the efforts to overcome are the most important), as commonly practiced in the valves of the art prior art in which force decreases rapidly after the start of emergence (see figure 4 , dashed curve), according to a link whose pitch is not constant, or which has a double slope.
  • the valve according to the invention has for its part a transformation device with linear behavior and therefore with improved controllability.
  • Another aspect of the invention is an assembly of such a valve and control means programmed according to a linear model.
  • the control means may comprise conventional electronic devices such as a motor control unit ("Engine Control Unit” in English).
  • the figure 1 represents an engine control valve 1 which is in this example an exhaust gas recirculation valve commonly referred to as "EGR valve".
  • EGR valve exhaust gas recirculation valve
  • the valve 1 comprises a fluid inlet 2 and a fluid outlet 3 between which is disposed the head 4 of a valve 5.
  • the valve 5 in the closed position makes it possible to stop the flow of the fluid entering through the inlet 2 and out through the outlet 3.
  • the full opening of the valve 5 allows the opposite free flow of the fluid while maintaining the valve 5 in an intermediate position allows the dosage of the fluid.
  • the valve 1 comprises a support 6 on which is mounted an actuator, constituted here by an electric motor 7, a motion transformation device 9, and a transmission wheel 8 which allows the motor 7 to drive the motion transformation device 9, the latter transforming the rotary movement of the transmission wheel 8 in rectilinear motion of the valve 5.
  • the movement transformation device 9 has a generally tubular shape and has at one of its ends a valve seat 10 and at the other end of its ends a cam path 11.
  • the valve may be without a seat valve.
  • the cam path 11 comprises two tracks made in a tubular wall 12 of the motion transformation device 9.
  • a bar 13 fixed on the valve 5 and provided with rollers 14 is adapted to cooperate with the cam path 11 .
  • the motion transformation device 9 cooperates with an input wheel 15 having a toothed portion 16 attached to a portion tubular 17 rotatably mounted on the motion transformation device 9 by means of a bearing 18.
  • Elastic return means 19 are here provided in the form of a helical torsion spring for biasing the input wheel 15 in one of its extreme angular positions corresponding in this example to the closed position of the valve 5.
  • the motor 7 is thus actuated against the return means 19 to open the valve 5.
  • a position sensor 20 furthermore allows the position of the valve 5 to be measured at any time along its axial stroke, and this thanks to a feeler 21 held in contact with the bar 13 by means of a spring (not represented). .
  • the sensor 20 has a linear behavior in that the probe 21
  • a protective cover 22 (see figure 2 ) mounted on the support 6 protects the rotating elements of the valve 1.
  • the motor 7 is powered and driven according to a control integrated in a conventional manner to computing means (not shown).
  • the motor 7 When the motor 7 is rotated, it rotates the transmission wheel 8 (and any gear train possibly provided) which in turn rotates the input wheel 15.
  • the latter also drives in rotation the bar 13 by complementarity of shapes (see figure 1 ) while leaving it free in axial translation. This causes rolling of the rollers 14 on the cam path 11 (which is fixed, the motion-transforming device 9 being fixed to the support 6) and consequently the joint translation of the bar 13 and the valve 5 in the axial direction, causing opening or closing of the valve 5.
  • the cam path 11 is configured so that the force exerted on the valve 5 when it opens is substantially linear.
  • the motion transformation device 9 thus has a behavior approaching a linear system.
  • a linear system is a system model that applies a linear (first degree) operator to an input signal.
  • a linear system typically displays much simpler features and properties than the general nonlinear case.
  • the axial force applied to the valve varies linearly or quasi-linearly along the axial stroke of the valve 5.
  • the curve 23 representative of the axial force applied to the valve 5 as a function of its axial stroke (valve lift) is therefore substantially a straight line.
  • this curve 23 is shown in solid lines while a conventional curve 24 relating to the valves of the prior art is shown in dashed lines.
  • the variation of the axial force applied to the valve 5 is not only constant but very low.
  • the force at the beginning of the valve lift (point 25 of the figure 4 ) may be 420 N while the force at the end of the valve lift (point 26 of the figure 4 ) can be 380 N or a force variation of approximately 10% over the entire stroke of the valve 5.
  • the order of magnitude of the change in force for the valves of the prior art is 1000% (see figure 4 ).
  • the curve 23 is here not only a straight line but is moreover quasi-horizontal.
  • the cam path 11 is, in the present example, consisting of two tracks arranged face to face (diametrically opposed) on the tubular wall 12, each of these tracks being here formed of a through opening in the tubular wall 12.
  • the shape of the light is a helicoid extending on the tubular wall 12. In order to obtain a constant variation valve lift axial force, this helicoid is in the present example provided with a constant helix pitch (see FIG. figure 3 ).
  • the opening behavior of the valve 1 is substantially linear in the sense that a rotation of the motor 7 at a given angle will produce substantially the same variation of force on the valve 5, regardless of the position of the valve 5.
  • This variation being furthermore reduced to a minimum here, the rotation of the motor 7 by a given angle will substantially produce the application of the same force on the valve 5 , whatever the position of the valve 5.
  • substantially linear behavior of the motion transformation device 9 may be supplemented by other elements of the kinematic chain from the motor 7 to the valve 5 and also advantageously having a substantially linear behavior.
  • the embodiment of the present example which is particularly advantageous, groups on this kinematic chain only elements with a substantially linear behavior.
  • This kinematic chain can therefore be modeled according to a linear model with satisfactory results.
  • This linear model is present in the electronic device chosen to drive the valve.
  • the motor 7, first of all, is here a DC motor, which gives it a substantially linear behavior.
  • All gearing transmitting the rotation of the motor 7 to the input wheel 15 is also substantially linear behavior, that is to say that the teeth of the toothed wheels (here, the wheels 8 and 15) are regularly distributed on the useful circumference of said wheels.
  • Friction is also a source of non-linearity.
  • the bearing 18 here makes it possible to reduce these friction to bring the system closer to the linear behavior.
  • the helical torsion spring constituting the return means 19 is also here with a substantially linear behavior, that is to say that the rotation of the input wheel 15 is directly proportional to the torque that caused this rotation (the applied torque by the transmission wheel). This behavior is obtained by choosing a substantially constant stiffness spring.
  • the entire kinematic chain from the motor 7 to the valve 5 thus has a substantially linear behavior which improves its controllability.
  • the task of the calculation means (not shown) for the control of the motor 7 is here reduced because, to pass from a position setpoint for the valve 5 to the corresponding command of the motor 7, the calculation means have to manipulate equations linear, requiring less computing power, better responsiveness and greater robustness.
  • the command the motor 7 is here linear, that is to say made according to a linear model, the first degree.
  • the gear train from the motor 7 to the input wheel 15 may comprise any number of wheels or gears.
  • the valve may be any member that provides flow control (opening, closing and / or dosing) by a translational member.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Valve Device For Special Equipments (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

L'invention concerne le domaine des véhicules automobiles.The invention relates to the field of motor vehicles.

Elle concerne plus particulièrement une vanne de contrôle moteur prévue pour gérer la circulation d'un fluide dans un conduit lié au moteur du véhicule.It relates more particularly to an engine control valve provided to manage the circulation of a fluid in a duct connected to the engine of the vehicle.

ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

On connait des vannes de contrôle moteur actionnées par un moteur rotatif et adaptées à déplacer en translation une soupape disposée dans un conduit et permettant de contrôler le passage du fluide dans ce conduit. Ces vannes comprennent un moteur électrique associé à un train d'engrenages permettant de mettre en rotation un système de came. Le déplacement en translation généré permet l'entraînement de la soupape selon un mouvement rectiligne.Motor control valves actuated by a rotary motor are known and adapted to move in translation a valve disposed in a conduit and for controlling the passage of fluid in this conduit. These valves comprise an electric motor associated with a gear train for rotating a cam system. The displacement in translation generated allows the drive of the valve in a rectilinear motion.

EP 1 375 892 décrit un tel dispositif. EP 1 375 892 describes such a device.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

L'invention a pour but d'améliorer ce type de vanne en proposant une vanne de contrôle moteur dont la commande est plus aisée et plus robuste.The purpose of the invention is to improve this type of valve by proposing a motor control valve whose control is easier and more robust.

BREVE DESCRIPTION DE L'INVENTIONBRIEF DESCRIPTION OF THE INVENTION

A cet effet, l'invention vise une vanne de contrôle moteur comportant un actionneur rotatif, une soupape, et un dispositif de transformation de mouvement adapté à transformer la rotation de l'actionneur en translation de la soupape, caractérisé en ce que le dispositif de transformation de mouvement comporte une liaison hélicoïdale à pas constant pour l'entraînement en translation de la soupape.For this purpose, the invention provides an engine control valve comprising a rotary actuator, a valve, and a device for transforming movement adapted to transform the rotation of the actuator in translation of the valve, characterized in that the device motion transformation comprises a constant pitch helical link for translational drive of the valve.

Grâce à cette configuration, l'entraînement en translation de la soupape par le dispositif de transformation de mouvement se fait selon une loi sensiblement linéaire, c'est-à-dire que la force axiale exercée sur la soupape pour son ouverture subit des variations, en fonction de la levée de soupape et donc de la rotation de l'actionneur, qui peuvent être représentées par une ligne sensiblement droite. Cela ne permet pas d'obtenir une importante démultiplication de la force appliquée à la soupape dès le début de la phase de levée de soupape (là où les efforts à vaincre sont les plus importants), comme couramment pratiqué dans les vannes de l'art antérieur dans lesquelles la force diminue rapidement après le début de la levée (voir figure 4, courbe en pointillés), selon une liaison dont le pas n'est pas constant, voire qui présente une double pente.With this configuration, the translation drive of the valve by the motion transformation device is made according to a substantially linear law, that is to say that the axial force exerted on the valve for its opening undergoes variations, depending on the valve lift and therefore the rotation of the actuator, which can be represented by a substantially straight line. This does not allow to obtain a significant reduction in the force applied to the valve from the beginning of the valve lift phase (where the efforts to overcome are the most important), as commonly practiced in the valves of the art prior art in which force decreases rapidly after the start of emergence (see figure 4 , dashed curve), according to a link whose pitch is not constant, or which has a double slope.

La vanne selon l'invention bénéficie quant à elle d'un dispositif de transformation à comportement linéaire et donc à commandabilité améliorée.The valve according to the invention has for its part a transformation device with linear behavior and therefore with improved controllability.

Au tout début de la levée de soupape, les efforts de pression du fluide circulant dans la vanne sont les plus importants. L'importance des efforts à vaincre pour lever la soupape étant directement dépendante de la position initiale de la soupape, le fait de ne pas concentrer l'application de la force au début de la levée de soupape va à l'encontre du principe classique consistant à répartir cette force selon le besoin apparent, c'est-à-dire concentrée au début puis en chute rapide.At the very beginning of the valve lift, the pressure forces of the fluid flowing in the valve are the most important. Since the importance of the efforts to overcome to lift the valve is directly dependent on the initial position of the valve, the failure to concentrate the application of the force at the beginning of the valve lift is contrary to the conventional principle of to distribute this force according to the apparent need, that is to say, concentrated at the beginning and then rapidly falling.

Cette vanne peut en outre comporter les caractéristiques suivantes, seules ou en combinaison :

  • la liaison hélicoïdale comporte un chemin de came dont le pas est constant ;
  • le dispositif de transformation de mouvement comporte une paroi tubulaire dans laquelle est pratiqué le chemin de came ;
  • le chemin de came comporte deux pistes disposées face à face sur la paroi tubulaire ;
  • la vanne comporte au moins un galet rattaché à la soupape et adapté à coopérer avec le chemin de came ;
  • ledit au moins un galet est monté à rotation sur un barreau rattaché à la soupape, le barreau étant disposé dans le volume délimité par la paroi tubulaire de sorte à coopérer avec une roue d'entrée qui est entraînée par l'actionneur rotatif et qui est adaptée à entraîner en rotation le barreau ; la roue d'entrée peut être entraînée directement ou indirectement par l'actionneur rotatif ;
  • la roue d'entrée est montée à rotation sur la paroi tubulaire ;
  • la roue d'entrée est montée à rotation sur la paroi tubulaire par l'intermédiaire d'un roulement ;
  • un capteur de position de la soupape est disposé dans l'espace délimité par la paroi tubulaire ;
  • le capteur de position est un capteur à déplacement rectiligne ; L'emploi d'un capteur à déplacement rectiligne est plus avantageux qu'un capteur rotatif car il mesure directement le déplacement de la soupape. Ce capteur a ici, de fait, un comportement sensiblement linéaire car il est directement associé à l'élément (la soupape) dont la position est à déterminer, sans démultiplication ou transformation de mouvement. Dans les vannes de l'art antérieur, des capteurs rotatifs sont en général employés pour déterminer la position angulaire d'une came agissant sur la soupape et indirectement en déduire la position de la soupape en prenant en compte la forme de la dite came. Dans ces vannes, un capteur à déplacement rectiligne aurait de fait un comportement non-linéaire. On entend par « comportement sensiblement linéaire » le fait pour un élément de la vanne de présenter un comportement physique proche d'un modèle théorique de système linéaire, au sens que l'on lui donne dans les domaines de l'automatisme et du traitement du signal ;
  • l'actionneur rotatif comporte un moteur électrique à comportement sensiblement linéaire ;
  • ce moteur est un moteur à courant continu ;
  • l'actionneur rotatif est relié au dispositif de transformation de mouvement par des moyens de transmission présentant un comportement sensiblement linéaire ;
  • la vanne comporte des moyens de rappel de la soupape en position fermée, ces moyens de rappel présentant un comportement sensiblement linéaire ;
  • les moyens de rappel élastique comportent un ressort de torsion hélicoïdal ;
  • la chaîne cinématique allant de l'actionneur rotatif à la soupape est constituée d'éléments présentant un comportement sensiblement linéaire ;
This valve may further comprise the following characteristics, alone or in combination:
  • the helical linkage comprises a cam path whose pitch is constant;
  • the motion transformation device comprises a tubular wall in which the cam path is made;
  • the cam path comprises two tracks arranged face to face on the tubular wall;
  • the valve comprises at least one roller attached to the valve and adapted to cooperate with the cam path;
  • said at least one roller is rotatably mounted on a bar attached to the valve, the bar being disposed in the volume defined by the tubular wall so as to cooperate with an input wheel which is driven by the rotary actuator and which is adapted to rotate the bar; the input wheel can be driven directly or indirectly by the rotary actuator;
  • the input wheel is rotatably mounted on the tubular wall;
  • the input wheel is rotatably mounted on the tubular wall via a bearing;
  • a position sensor of the valve is disposed in the space delimited by the tubular wall;
  • the position sensor is a rectilinear displacement sensor; The use of a linear displacement sensor is more advantageous than a rotary sensor because it directly measures the displacement of the valve. This The sensor here has, in fact, a substantially linear behavior since it is directly associated with the element (the valve) whose position is to be determined, without reduction or transformation of movement. In the valves of the prior art, rotary sensors are generally used to determine the angular position of a cam acting on the valve and indirectly to deduce the position of the valve taking into account the shape of said cam. In these valves, a rectilinear displacement sensor would in fact have a non-linear behavior. The term "substantially linear behavior" means that an element of the valve has a physical behavior close to a theoretical linear system model, in the sense that it is given in the fields of automation and processing of signal;
  • the rotary actuator comprises an electric motor with a substantially linear behavior;
  • this motor is a DC motor;
  • the rotary actuator is connected to the motion transformation device by transmission means having a substantially linear behavior;
  • the valve comprises means for returning the valve in the closed position, these biasing means having a substantially linear behavior;
  • the elastic return means comprise a helical torsion spring;
  • the kinematic chain running from the rotary actuator to the valve consists of elements exhibiting a substantially linear behavior;

Un autre aspect de l'invention vise un ensemble d'une telle soupape et de moyens de commande programmés selon un modèle linéaire.Another aspect of the invention is an assembly of such a valve and control means programmed according to a linear model.

Les moyens de commande peuvent comporter des dispositifs électroniques classiques tel qu'un calculateur moteur (« Engine Control Unit », en anglais).The control means may comprise conventional electronic devices such as a motor control unit ("Engine Control Unit" in English).

Ils sont programmés selon un modèle linéaire, c'est-à-dire que la fonction de transfert du modèle qui décrit la position de la soupape en fonction de la consigne donnée en entrée est une fonction linéaire.They are programmed according to a linear model, that is to say that the transfer function of the model which describes the position of the valve as a function of the setpoint input is a linear function.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

L'invention sera mieux comprise à la lumière de la description qui va suivre d'un mode de réalisation préféré et non limitatif, description faite en référence aux dessins annexés, parmi lesquels :

  • la figure 1 est une vue en perspective d'une vanne selon l'invention ;
  • la figure 2 est une vue éclatée de la vanne de figure 1 ;
  • la figure 3 est une vue en perspective du dispositif de transformation de mouvements de la vanne de la figure 1 ;
  • la figure 4 est un graphique montrant la force axiale appliquée à la soupape en fonction de sa course de levée dans la vanne de la figure 1.
The invention will be better understood in the light of the following description of a preferred embodiment and not limiting, description made in reference to the accompanying drawings, among which:
  • the figure 1 is a perspective view of a valve according to the invention;
  • the figure 2 is an exploded view of the valve of figure 1 ;
  • the figure 3 is a perspective view of the motion transformation device of the valve of the figure 1 ;
  • the figure 4 is a graph showing the axial force applied to the valve as a function of its lift stroke in the valve of the figure 1 .

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

La figure 1 représente une vanne 1 de contrôle moteur qui est dans le présent exemple une vanne de recirculation de gaz d'échappement communément dénommée « vanne EGR ». Les différents éléments constitutifs de la vanne 1 sont visibles séparément sur la vue éclatée de la figure 2.The figure 1 represents an engine control valve 1 which is in this example an exhaust gas recirculation valve commonly referred to as "EGR valve". The different constituent elements of the valve 1 are visible separately on the exploded view of the figure 2 .

La vanne 1 comporte une entrée de fluide 2 et une sortie de fluide 3 entre lesquelles est disposée la tête 4 d'une soupape 5. De manière classique pour une vanne EGR, la soupape 5 en position de fermeture permet de stopper l'écoulement du fluide entrant par l'entrée 2 et sortant par la sortie 3. La pleine ouverture de la soupape 5 permet au contraire le libre écoulement de ce fluide tandis que le maintien de la soupape 5 dans une position intermédiaire permet le dosage du fluide.The valve 1 comprises a fluid inlet 2 and a fluid outlet 3 between which is disposed the head 4 of a valve 5. In a conventional manner for an EGR valve, the valve 5 in the closed position makes it possible to stop the flow of the fluid entering through the inlet 2 and out through the outlet 3. The full opening of the valve 5 allows the opposite free flow of the fluid while maintaining the valve 5 in an intermediate position allows the dosage of the fluid.

La vanne 1 comporte un support 6 sur lequel sont montés un actionneur, constitué ici par un moteur électrique 7, un dispositif de transformation de mouvement 9, et une roue de transmission 8 qui permet au moteur 7 d'entraîner le dispositif de transformation de mouvement 9, ce dernier transformant le mouvement rotatif de la roue de transmission 8 en mouvement rectiligne de la soupape 5.The valve 1 comprises a support 6 on which is mounted an actuator, constituted here by an electric motor 7, a motion transformation device 9, and a transmission wheel 8 which allows the motor 7 to drive the motion transformation device 9, the latter transforming the rotary movement of the transmission wheel 8 in rectilinear motion of the valve 5.

Le dispositif de transformation de mouvement 9 a une forme générale tubulaire et comporte à l'une de ses extrémités un siège de soupape 10 et à l'autre de ses extrémités un chemin de came 11. En variante, la vanne peut être dépourvue de siège de soupape. Dans le présent exemple, le chemin de came 11 comporte deux pistes pratiquées dans une paroi tubulaire 12 du dispositif de transformation de mouvement 9. Un barreau 13 fixé sur la soupape 5 et muni de galets 14 est adapté à coopérer avec le chemin de came 11.The movement transformation device 9 has a generally tubular shape and has at one of its ends a valve seat 10 and at the other end of its ends a cam path 11. In a variant, the valve may be without a seat valve. In the present example, the cam path 11 comprises two tracks made in a tubular wall 12 of the motion transformation device 9. A bar 13 fixed on the valve 5 and provided with rollers 14 is adapted to cooperate with the cam path 11 .

Le dispositif de transformation de mouvement 9 coopère avec une roue d'entrée 15 comportant une portion dentée 16 rattachée à une portion tubulaire 17 montée à rotation sur le dispositif de transformation de mouvement 9 par l'intermédiaire d'un roulement 18.The motion transformation device 9 cooperates with an input wheel 15 having a toothed portion 16 attached to a portion tubular 17 rotatably mounted on the motion transformation device 9 by means of a bearing 18.

Des moyens de rappel élastiques 19 sont ici prévus sous forme d'un ressort hélicoïdal de torsion pour rappeler la roue d'entrée 15 dans l'une de ses positions angulaires extrême correspondant dans le présent exemple à la position fermée de la soupape 5.Elastic return means 19 are here provided in the form of a helical torsion spring for biasing the input wheel 15 in one of its extreme angular positions corresponding in this example to the closed position of the valve 5.

Le moteur 7 est donc ici actionné à l'encontre des moyens de rappel 19 pour ouvrir la soupape 5.The motor 7 is thus actuated against the return means 19 to open the valve 5.

Un capteur de position 20 permet de plus de mesurer à tout moment la position de la soupape 5 le long de sa course axiale, et ce grâce à un palpeur 21 maintenu en contact avec le barreau 13 au moyen d'un ressort (non représenté). Le capteur 20 a de fait un comportement linéaire dans la mesure où le palpeur 21A position sensor 20 furthermore allows the position of the valve 5 to be measured at any time along its axial stroke, and this thanks to a feeler 21 held in contact with the bar 13 by means of a spring (not represented). . The sensor 20 has a linear behavior in that the probe 21

Un capot de protection 22 (voir figure 2) monté sur le support 6 protège les éléments tournants de la vanne 1.A protective cover 22 (see figure 2 ) mounted on the support 6 protects the rotating elements of the valve 1.

Le moteur 7 est alimenté et piloté suivant une commande intégrée de manière classique à des moyens de calcul (non représentés).The motor 7 is powered and driven according to a control integrated in a conventional manner to computing means (not shown).

Lorsque le moteur 7 est commandé en rotation, il entraîne en rotation la roue de transmission 8 (et tout autre train d'engrenage éventuellement prévu) qui entraîne à son tour en rotation la roue d'entrée 15. Cette dernière entraîne également en rotation le barreau 13 par complémentarité de formes (voir figure 1) tout en le laissant libre en translation axiale. Cela provoque le roulement des galets 14 sur le chemin de came 11 (qui est fixe, le dispositif de transformation de mouvement 9 étant fixé au support 6) et par conséquent la translation conjointe du barreau 13 et de la soupape 5 dans la direction axiale, provocant l'ouverture ou la fermeture de la soupape 5.When the motor 7 is rotated, it rotates the transmission wheel 8 (and any gear train possibly provided) which in turn rotates the input wheel 15. The latter also drives in rotation the bar 13 by complementarity of shapes (see figure 1 ) while leaving it free in axial translation. This causes rolling of the rollers 14 on the cam path 11 (which is fixed, the motion-transforming device 9 being fixed to the support 6) and consequently the joint translation of the bar 13 and the valve 5 in the axial direction, causing opening or closing of the valve 5.

En référence à la figure 4, le dispositif de transformation de mouvement 9 est ici représenté en dehors de la vanne 1. Sur cette figure, la roue d'entrée 15 est dans une position angulaire :

  • qui correspond à une position angulaire du barreau 13 ;
  • qui correspond à une position des galets 14 dans le chemin de came 11 (en bout de piste) ;
  • qui correspond à une position de la soupape (position fermée).
With reference to the figure 4 , the motion transformation device 9 is here represented outside the valve 1. In this figure, the input wheel 15 is in an angular position:
  • which corresponds to an angular position of the bar 13;
  • which corresponds to a position of the rollers 14 in the cam path 11 (at the end of the track);
  • which corresponds to a position of the valve (closed position).

Le chemin de came 11 est configuré pour que la force exercée sur la soupape 5 lors de son ouverture soit sensiblement linéaire.The cam path 11 is configured so that the force exerted on the valve 5 when it opens is substantially linear.

Le dispositif de transformation de mouvement 9 présente ainsi un comportement se rapprochant d'un système linéaire. Un système linéaire est un modèle de système qui applique un opérateur linéaire (du premier degré) à un signal d'entrée. Un système linéaire affiche typiquement des caractéristiques et des propriétés beaucoup plus simples que le cas général non-linéaire.The motion transformation device 9 thus has a behavior approaching a linear system. A linear system is a system model that applies a linear (first degree) operator to an input signal. A linear system typically displays much simpler features and properties than the general nonlinear case.

Ces propriétés linéaires améliorent la commandabilité du système.These linear properties improve the controllability of the system.

La force axiale appliquée sur la soupape varie de manière linéaire ou quasi-linéaire le long de la course axiale de la soupape 5. La courbe 23 représentative de la force axiale appliquée sur la soupape 5 en fonction de sa course axiale (levée de soupape) est donc sensiblement une droite. Sur la figure 4, cette courbe 23 est représentée en trait pleins tandis qu'une courbe classique 24 relative aux vannes de l'art antérieur est montrée en pointillés.The axial force applied to the valve varies linearly or quasi-linearly along the axial stroke of the valve 5. The curve 23 representative of the axial force applied to the valve 5 as a function of its axial stroke (valve lift) is therefore substantially a straight line. On the figure 4 this curve 23 is shown in solid lines while a conventional curve 24 relating to the valves of the prior art is shown in dashed lines.

Pour une même rotation du moteur 7, correspondant directement à une variation d'angle du barreau 13, la variation de la force axiale appliquée sur la soupape 5 grâce à la coopération du chemin de came 11 et des galets 14 est donc sensiblement constante et est identique sur toute la plage utile de rotation du moteur 7.For the same rotation of the motor 7, corresponding directly to an angle variation of the bar 13, the variation of the axial force applied to the valve 5 by the cooperation of the cam path 11 and the rollers 14 is therefore substantially constant and is identical over the entire useful range of rotation of the motor 7.

Dans l'exemple de la figure 4, la variation de la force axiale appliquée à la soupape 5 est non seulement constante mais très faible. A titre d'exemple, la force en début de levée de soupape (point 25 de la figure 4) peut être de 420 N tandis que la force en fin de levée de soupape (point 26 de la figure 4) peut être de 380 N soit une variation de la force d'environ 10 % sur toute la course de levée de la soupape 5. A titre de comparaison, l'ordre de grandeur de la variation de la force pour les vannes de l'art antérieur est de 1000% (voir figure 4).In the example of the figure 4 , the variation of the axial force applied to the valve 5 is not only constant but very low. For example, the force at the beginning of the valve lift (point 25 of the figure 4 ) may be 420 N while the force at the end of the valve lift (point 26 of the figure 4 ) can be 380 N or a force variation of approximately 10% over the entire stroke of the valve 5. For comparison, the order of magnitude of the change in force for the valves of the prior art is 1000% (see figure 4 ).

La courbe 23 est donc ici non seulement une droite mais est de plus quasi-horizontale.The curve 23 is here not only a straight line but is moreover quasi-horizontal.

Le chemin de came 11 est, dans le présent exemple, constitué de deux pistes disposées face à face (diamétralement opposées) sur la paroi tubulaire 12, chacune de ces pistes étant ici formée d'une lumière débouchante pratiquée dans la paroi tubulaire 12. La forme de la lumière est un hélicoïde s'étendant sur la paroi tubulaire 12. Pour obtenir une force axiale de levée de soupape à variation constante, cet hélicoïde est dans le présent exemple doté d'un pas d'hélice constant (voir figure 3).The cam path 11 is, in the present example, consisting of two tracks arranged face to face (diametrically opposed) on the tubular wall 12, each of these tracks being here formed of a through opening in the tubular wall 12. The shape of the light is a helicoid extending on the tubular wall 12. In order to obtain a constant variation valve lift axial force, this helicoid is in the present example provided with a constant helix pitch (see FIG. figure 3 ).

Ainsi, grâce au dispositif de transformation de mouvement 9, le comportement à l'ouverture de la vanne 1 est sensiblement linéaire au sens où une rotation du moteur 7 d'un angle donné produira sensiblement la même variation de force sur la soupape 5, quelque soit la position de la soupape 5. Cette variation étant de plus ici réduite au minimum, la rotation du moteur 7 d'un angle donné produira sensiblement l'application de la même force sur la soupape 5, quelque soit la position de la soupape 5.Thus, thanks to the motion transformation device 9, the opening behavior of the valve 1 is substantially linear in the sense that a rotation of the motor 7 at a given angle will produce substantially the same variation of force on the valve 5, regardless of the position of the valve 5. This variation being furthermore reduced to a minimum here, the rotation of the motor 7 by a given angle will substantially produce the application of the same force on the valve 5 , whatever the position of the valve 5.

Par ailleurs, le comportement sensiblement linéaire du dispositif de transformation de mouvement 9 peut-être complété par d'autres éléments de la chaîne cinématique allant du moteur 7 à la soupape 5 et présentant eux aussi avantageusement un comportement sensiblement linéaire.Furthermore, the substantially linear behavior of the motion transformation device 9 may be supplemented by other elements of the kinematic chain from the motor 7 to the valve 5 and also advantageously having a substantially linear behavior.

Le mode de réalisation du présent exemple, particulièrement avantageux, ne regroupe sur cette chaîne cinématique que des éléments au comportement sensiblement linéaire. Cette chaîne cinématique peut donc être modélisée selon un modèle linéaire avec des résultats satisfaisants. Ce modèle linéaire est présent dans le dispositif électronique choisi pour piloter la vanne.The embodiment of the present example, which is particularly advantageous, groups on this kinematic chain only elements with a substantially linear behavior. This kinematic chain can therefore be modeled according to a linear model with satisfactory results. This linear model is present in the electronic device chosen to drive the valve.

Le moteur 7, tout d'abord, est ici un moteur à courant continu, ce qui lui procure un comportement sensiblement linéaire.The motor 7, first of all, is here a DC motor, which gives it a substantially linear behavior.

Toute la pignonerie transmettant la rotation du moteur 7 à la roue d'entrée 15 est également à comportement sensiblement linéaire, c'est-à-dire que les dents des roues dentées (ici, les roues 8 et 15) sont régulièrement réparties sur la circonférence utile desdites roues.All gearing transmitting the rotation of the motor 7 to the input wheel 15 is also substantially linear behavior, that is to say that the teeth of the toothed wheels (here, the wheels 8 and 15) are regularly distributed on the useful circumference of said wheels.

Les frottements sont également une source de non-linéairité. Le roulement 18 permet ici de réduire ces frottements pour se rapprocher encore le système du comportement linéaire.Friction is also a source of non-linearity. The bearing 18 here makes it possible to reduce these friction to bring the system closer to the linear behavior.

Le ressort de torsion hélicoïdal constituant les moyens de rappel 19 est également ici à comportement sensiblement linéaire, c'est-à-dire que la rotation de la roue d'entrée 15 est directement proportionnelle au couple qui a provoqué cette rotation (le couple appliqué par la roue de transmission). Ce comportement est obtenu par le choix d'un ressort à raideur sensiblement constante.The helical torsion spring constituting the return means 19 is also here with a substantially linear behavior, that is to say that the rotation of the input wheel 15 is directly proportional to the torque that caused this rotation (the applied torque by the transmission wheel). This behavior is obtained by choosing a substantially constant stiffness spring.

L'ensemble de la chaîne cinématique allant du moteur 7 à la soupape 5 présente ainsi un comportement sensiblement linéaire qui améliore sa commandabilité.The entire kinematic chain from the motor 7 to the valve 5 thus has a substantially linear behavior which improves its controllability.

La tâche des moyens de calcul (non représentés) pour la commande du moteur 7 est ici réduite car, pour passer d'une consigne de position pour la soupape 5 à la commande correspondante du moteur 7, les moyens de calcul ont à manipuler des équations linéaires, ce qui nécessite moins de puissance de calcul, une meilleure réactivité et une plus grande robustesse. La commande du moteur 7 est donc ici linéaire, c'est-à-dire réalisée selon un modèle linéaire, du premier degré.The task of the calculation means (not shown) for the control of the motor 7 is here reduced because, to pass from a position setpoint for the valve 5 to the corresponding command of the motor 7, the calculation means have to manipulate equations linear, requiring less computing power, better responsiveness and greater robustness. The command the motor 7 is here linear, that is to say made according to a linear model, the first degree.

D'autres caractéristiques de la vanne 1 peuvent être envisagées sans pour autant sortir du cadre de l'invention. Notamment, le train d'engrenages allant du moteur 7 à la roue d'entrée 15 peut comporter un nombre quelconque de roues ou pignons.Other characteristics of the valve 1 can be envisaged without departing from the scope of the invention. In particular, the gear train from the motor 7 to the input wheel 15 may comprise any number of wheels or gears.

La soupape peut être un quelconque organe qui assure le contrôle du flux (ouverture, fermeture et/ou dosage) par un organe à déplacement en translation.The valve may be any member that provides flow control (opening, closing and / or dosing) by a translational member.

Claims (15)

  1. Engine control valve (1) comprising a rotary actuator (7), a valve shutter (5) and a movement conversion device (9) designed to convert the rotational movement of the actuator (7) into a translational movement of the valve shutter (5), said device comprising a tubular wall (12) and a constant-pitch helical connection for driving the translational movement of the valve shutter (5), the valve being characterized in that the helical connection comprises a camway (11) of constant pitch, said camway (11) comprising a track formed by an opening formed in said tubular wall (12).
  2. Valve according to Claim 1, in which the camway (11) comprises two tracks arranged facing one another on the tubular wall (12).
  3. Valve according to Claim 1 or 2, comprising at least one follower (14) attached to the valve shutter (5) and designed to collaborate with the camway (11).
  4. Valve according to Claim 3, in which said at least one follower (14) is mounted to rotate on a bar (13) attached to the valve shutter (5), the bar (13) being arranged in the volume delimited by the tubular wall (12) so as to collaborate with an input wheel (15) which is driven by the rotary actuator (7) and which is designed to rotate the bar (13).
  5. Valve according to Claim 4, in which the input wheel (15) is mounted to rotate on the turbular wall (12).
  6. Valve according to Claim 5, in which the input wheel (15) is mounted to rotate on the tubular wall (12) via a rolling bearing (18).
  7. Valve according to one of Claims 1 to 6, in which a position sensor (20) that senses the position of the valve shutter (5) is positioned in the space delimited by the tubular wall (12).
  8. Valve according to Claim 7, in which the position sensor (20) is a linear-displacement transducer.
  9. Valve according to one of Claims 1 to 8, in which the rotary actuator comprises an electric motor (7) that behaves in a substantially linear manner.
  10. Valve according to Claim 9, in which the motor (7) is a DC motor.
  11. Valve according to one of Claims 1 to 10, in which the rotary actuator (7) is connected to the movement conversion device (9) by transmission means which behave in a substantially linear manner.
  12. Valve according to one of Claims 1 to 11, comprising return means (19) that return the valve shutter (5) to the closed position, these return means (19) behaving in a substantially linear manner.
  13. Valve according to Claim 12, in which the elastic return means comprise a helical torsion spring (19).
  14. Valve according to one of Claims 1 to 13, in which the drive train from the rotary actuator (7) to the valve shutter (5) is made up of elements that behave in a substantially linear manner.
  15. An assembly comprising a valve (1) according to one of Claims 1 to 13 and control means which are programmed to a linear model.
EP10726947.4A 2009-06-17 2010-06-17 Valve having a motion transforming device Active EP2443332B1 (en)

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FR0902949 2009-06-17
PCT/EP2010/058549 WO2010146121A1 (en) 2009-06-17 2010-06-17 Valve comprising a movement transformation device

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KR20120050967A (en) 2012-05-21
WO2010146121A1 (en) 2010-12-23
CN102482998A (en) 2012-05-30
JP2012530209A (en) 2012-11-29
US20120138029A1 (en) 2012-06-07
EP2443332A1 (en) 2012-04-25
US9745901B2 (en) 2017-08-29
CN102482998B (en) 2017-03-22

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