EP1525375B1 - Method of determining a clearance - Google Patents

Method of determining a clearance Download PDF

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Publication number
EP1525375B1
EP1525375B1 EP20030750797 EP03750797A EP1525375B1 EP 1525375 B1 EP1525375 B1 EP 1525375B1 EP 20030750797 EP20030750797 EP 20030750797 EP 03750797 A EP03750797 A EP 03750797A EP 1525375 B1 EP1525375 B1 EP 1525375B1
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EP
European Patent Office
Prior art keywords
movable member
valve
electromagnetic
extreme
clearance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP20030750797
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German (de)
French (fr)
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EP1525375A1 (en
Inventor
Nicolas Gelez
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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 EP1525375A1 publication Critical patent/EP1525375A1/en
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Publication of EP1525375B1 publication Critical patent/EP1525375B1/en
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Classifications

    • 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
    • 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
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2132—Biasing means
    • F01L2009/2134—Helical springs
    • F01L2009/2136—Two opposed springs for intermediate resting position of the armature
    • 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
    • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
    • F01L2009/2167—Sensing means
    • F01L2009/2171—Vibration sensors
    • 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
    • F01L9/40—Methods of operation thereof; Control of valve actuation, e.g. duration or lift
    • F01L2009/4098—Methods of operation thereof; Control of valve actuation, e.g. duration or lift relating to gap between armature shaft and valve stem end
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225—Position or extent of motion indicator

Definitions

  • the present invention relates to a method for determining a game between two moving parts as known according to US-A-5,832,955 .
  • the method of the invention is more particularly usable in heat engines having valves each associated with a valve actuator to determine the clearance between the tail of each valve and the movable member of the actuator which cooperates with the tail of the valve. the valve for moving the valve between an open position in which the valve is spaced from its seat and a closed position in which the valve is pressed against its seat.
  • electromagnetic valve actuators which conventionally comprise elastic means and electromagnetic means for actuating the movable member between two extreme positions respectively corresponding to the open position of the valve and to the closed position of the valve.
  • the elastic means generally comprise a spring associated with the movable member to bias the latter resiliently in its extreme open position and a spring associated with the valve stem to resiliently bias the latter in its closed position and to bias elastically the movable member in its extreme closed position.
  • the electromagnetic means generally comprise an electromagnet supplying and / or holding the movable member in the extreme open position and an electromagnet for supplying and / or holding the movable member in the extreme closed position.
  • the movable member and the valve are not connected to each other and there is a game commonly called “distribution clearance" between the movable member and the valve when the movable member is in the extreme closed position and the valve is correctly pressed against its seat by the spring associated therewith.
  • the distribution clearance varies during operation of the engine, in particular as a function of temperature, and also during the life of the engine, in particular according to the wear of the valve and the various components of the actuator. valve.
  • the distribution clearance may vary from one actuator to another depending on the manufacturing tolerances thereof.
  • An object of the invention is to provide a means for a simple and accurate way of determining the distribution set.
  • the invention is here described in application to the actuation of a valve 1 of a heat engine with the general reference 2.
  • the valve 1 has a shank 3 and is mounted on a cylinder head 4 of the engine 2 to slide between a closed position in which the valve is applied against a seat 5 of the cylinder head 4 and an open position in which the valve is detached from the seat 5 of the cylinder head 4.
  • the valve is actuated between these two positions via an actuator generally designated 6 mounted on the cylinder head 4 of the heat engine 2.
  • the actuator comprises a body 7 in which is mounted to slide a movable member generally designated 8 having a rod 9 having a first end 10 arranged to bear on a free end of the tail 3 of the valve 1 and a second end 11 secured to a pallet 12 received in a housing 13 of the body 7 to slide parallel to the rod 9.
  • the body 7 incorporates, in a manner known per se, electromagnetic means for moving the movable member 8.
  • the electromagnetic means comprise an electromagnet 14 for holding the vane 12 in a position called the extreme closing position of the valve and an electromagnet 15 for holding the vane 12 in a position called the extreme open position of the valve which open on two opposite sides of the housing 13 of the body 7.
  • the pallet 12 is here in contact with the electromagnet 14, 15 when it is in the corresponding extreme position.
  • the electromagnets 14, 15 are controlled in a manner known per se by non-represented means of servocontrol from a setpoint current and a moving speed of the movable member 8. This servo mode is known in itself. This slaving can be ensured by the engine control unit which also operates a speed signal of the pallet 12 obtained by derivation of a position signal provided by a position sensor 16 of the rod 9.
  • the position sensor 16 is for example a Hall effect sensor known in itself.
  • the actuator also comprises, in a manner known per se, elastic displacement means.
  • the elastic displacement means comprise in a known manner in itself a spring 17 interposed between a face 18 of the body 7 and a shoulder 19 of the rod 9 to recall the pallet 12 in the extreme open position and a spring 20 interposed between a face 21 of the yoke 4 and a shoulder 22 of the valve stem 3 to return the valve 1 in the closed position.
  • the actuator, the cylinder head 4 and the valve 1 are arranged in such a way that, when the pallet 12 is in the extreme closed position and the valve 1 is applied against its seat 5, there is a clearance j or set of distribution between the first end 10 of the rod 9 and the free end of the valve stem 3.
  • the method according to the invention makes it possible to determine the clearance j during the operation of the heat engine.
  • the method according to the invention comprises the step of controlling the electromagnets 14, 15 to move with a substantially constant speed the movable member 8 from its extreme closed position to its extreme open position.
  • the speed of movement of the movable member can be kept constant until the extreme open position or over a distance greater than a maximum possible clearance given the geometric characteristics of the actuator, the valve and the cylinder head.
  • the method comprises the step of obtaining values of the target current for intermediate positions of the movable member during the displacement of the movable member 8 from the extreme closed position to the extreme open position and the step of detecting an intermediate position of the movable member 8 for which the setpoint current undergoes a sudden change.
  • the setpoint current is supplied by the servo-control means (but it could be measured or detected) and the intermediate positions of the movable member 8 are provided by the position sensor 16.
  • the setpoint current is then related to the intermediate positions of the movable member 8.
  • the detection of the intermediate position for which the setpoint current undergoes a sudden change is preferably made from the derivative of the reference current relative to the position of the pallet 12.
  • this derivative is shaped as a curve, the curve has peaks at the intermediate position corresponding to the meeting point of the movable member 8 and the valve stem 3.
  • the electromagnetic means can be controlled to first bring the movable member 8 gently to the intermediate position determined herein. above to bring the movable member 8 into contact with the valve stem 3, then accelerate the movable member 8 once it bears against the valve stem.
  • the electromagnetic means can be controlled to first bring the movable member 8 quickly to the intermediate position determined above to have a quick closing of the valve, then gently bring the movable member 8 in extreme closed position to limit the noise of the contact of the pallet 12 with the electromagnet 14.
  • the determination of the game j is preferably renewed periodically, for example every second.
  • the clearance j can be determined with different modes of operation depending on the engine operating mode and the engine speed.
  • the implementation of the method described above does not interfere with the normal operation of the actuator, it does not generate additional noise and is therefore particularly suitable for use at idle speeds.
  • a determination method that would cause more noisy operation of the actuator could be used when the engine is in start mode or the engine is in normal operating mode at a higher speed than a predetermined speed, for example 2000 rpm .
  • the method of the invention can be realized for a displacement of the movable member towards the extreme open position as described above or towards the extreme closed position.
  • the moving speed of the movable member will be kept substantially constant, for example from a median intermediate position of the pallet.
  • the electromagnetic means can be controlled from another electrical characteristic such as a set voltage.

Abstract

The invention relates to a method of determining a clearance between a valve (1) stem (3) of a heat engine (2) and a mobile element (8) of an electromagnetic actuator (7) comprising electromagnetic means (14, 15) which are used to move said mobile element between an end valve open position and an end valve closed position. The aforementioned electromagnetic movement means are controlled using automatic control means according to a set current. The inventive method comprises steps consisting in controlling the electromagnetic means in order to: obtain an essentially constant movement speed for the aforementioned mobile element moving between the end closed position and the end open position, obtain the values of the set electrical characteristic for intermediary positions of the mobile element and detect an intermediary position for which the set electrical characteristic undergoes a sudden variation.

Description

La présente invention concerne un procédé de détermination d'un jeu entre deux pièces mobiles tel que connu selon US-A-5 832 955 .The present invention relates to a method for determining a game between two moving parts as known according to US-A-5,832,955 .

Le procédé de l'invention est plus particulièrement utilisable dans les moteurs thermiques comportant des soupapes associées chacune à un actionneur de soupape pour déterminer le jeu existant entre la queue de chaque soupape et l'organe mobile de l'actionneur qui coopère avec la queue de la soupape pour déplacer la soupape entre une position d'ouverture dans laquelle la soupape est écartée de son siège et une position de fermeture dans laquelle la soupape est plaquée contre son siège.The method of the invention is more particularly usable in heat engines having valves each associated with a valve actuator to determine the clearance between the tail of each valve and the movable member of the actuator which cooperates with the tail of the valve. the valve for moving the valve between an open position in which the valve is spaced from its seat and a closed position in which the valve is pressed against its seat.

Il existe des actionneurs électromagnétiques de soupape qui comprennent de façon classique des moyens élastiques et des moyens électromagnétiques d'actionnement de l'organe mobile entre deux positions extrêmes correspondant respectivement à la position d'ouverture de la soupape et à la position de fermeture de la soupape. Les moyens élastiques comprennent généralement un ressort associé à l'organe mobile pour rappeler celui-ci élastiquement dans sa position extrême d'ouverture et un ressort associé à la queue de soupape pour rappeler élastiquement celle-ci dans sa position de fermeture et pour rappeler élastiquement l'organe mobile dans sa position extrême de fermeture. Les moyens électromagnétiques comprennent généralement un électroaimant d'amenée et/ou de maintien de l'organe mobile dans la position extrême d'ouverture et un électroaimant d'amenée et/ou de maintien de l'organe mobile dans la position extrême de fermeture.There are electromagnetic valve actuators which conventionally comprise elastic means and electromagnetic means for actuating the movable member between two extreme positions respectively corresponding to the open position of the valve and to the closed position of the valve. valve. The elastic means generally comprise a spring associated with the movable member to bias the latter resiliently in its extreme open position and a spring associated with the valve stem to resiliently bias the latter in its closed position and to bias elastically the movable member in its extreme closed position. The electromagnetic means generally comprise an electromagnet supplying and / or holding the movable member in the extreme open position and an electromagnet for supplying and / or holding the movable member in the extreme closed position.

Afin d'être certain que la soupape est correctement plaquée contre son siège lorsque l'organe mobile est en position extrême de fermeture, l'organe mobile et la soupape ne sont pas reliés l'un à l'autre et il existe un jeu couramment appelé « jeu de distribution » entre l'organe mobile et la soupape lorsque l'organe mobile est en position extrême de fermeture et la soupape est correctement plaquée contre son siège par le ressort qui lui est associé.In order to be certain that the valve is correctly pressed against its seat when the movable member is in the extreme closed position, the movable member and the valve are not connected to each other and there is a game commonly called "distribution clearance" between the movable member and the valve when the movable member is in the extreme closed position and the valve is correctly pressed against its seat by the spring associated therewith.

Dès lors, si l'organe mobile est rapidement amené de la position extrême de fermeture à la position extrême d'ouverture, l'organe mobile vient heurter la queue de soupape. Ce choc, du reste bruyant, engendre des sollicitations mécaniques et une usure de l'organe mobile et de la queue de soupape qui peuvent dans des cas extrêmes aboutir à une détérioration de ceux-ci. Il est donc important de connaître précisément la valeur du jeu de distribution de manière que les moyens électromagnétiques puissent être commandés pour d'abord amener l'organe mobile doucement au contact de la queue de soupape puis accélérer l'organe mobile une fois celui-ci en appui contre la queue de soupape.Therefore, if the movable member is quickly brought from the extreme closed position to the extreme open position, the movable member strikes the valve stem. This shock, noisy, generates mechanical stresses and wear of the movable member and the valve stem which can in extreme cases lead to deterioration thereof. It is therefore important to know precisely the value of the distribution set so that the electromagnetic means can be controlled to first bring the movable member gently in contact with the valve stem and then accelerate the movable member once it resting against the valve stem.

Or, le jeu de distribution varie au cours du fonctionnement du moteur, notamment en fonction de la température, et également au cours de la vie du moteur, notamment en fonction de l'usure de la soupape et des différents composants de l'actionneur de soupape. En outre, le jeu de distribution peut varier d'un actionneur à un autre en fonction des tolérances de fabrication de ceux-ci.However, the distribution clearance varies during operation of the engine, in particular as a function of temperature, and also during the life of the engine, in particular according to the wear of the valve and the various components of the actuator. valve. In addition, the distribution clearance may vary from one actuator to another depending on the manufacturing tolerances thereof.

Pour déterminer le jeu de distribution, il est connu un procédé consistant à commander les moyens d'actionnement pour déplacer l'organe mobile de la position extrême de fermeture à la position extrême d'ouverture et de détecter une variation d'une caractéristique électrique dans les moyens d'actionnement électromagnétiques. Cette variation de caractéristique électrique est provoquée par l'accroissement de la résistance au déplacement de l'organe mobile lorsque celui-ci rencontre la queue de soupape. Le jeu de distribution est ensuite déterminé a partir de la mesure du temps qui s'est écoulé entre le début du déplacement de l'organe mobile et l'apparition de la variation de la caractéristique électrique. Cette détermination du jeu de distribution s'avère toutefois peu précise.In order to determine the distribution clearance, it is known a method of controlling the actuating means to move the movable member from the extreme closed position to the extreme open position and to detect a variation of an electrical characteristic in the electromagnetic actuation means. This variation in electrical characteristic is caused by the increase in resistance to displacement of the movable member when it meets the valve stem. The distribution game is then determined from the measurement of time which has elapsed between the beginning of the displacement of the movable member and the appearance of the variation of the electrical characteristic. This determination of the distribution game is however not very precise.

Un but de l'invention est de fournir un moyen permettant de manière simple et précise de déterminer le jeu de distribution.An object of the invention is to provide a means for a simple and accurate way of determining the distribution set.

A cet effet, on prévoit, selon l'invention, un procédé de détermination d'un jeu entre une queue de soupape de moteur thermique et un organe mobile d'un actionneur électromagnétique comportant des moyens électromagnétiques de déplacement de l'organe mobile entre une position extrême d'ouverture et une position extrême de fermeture de la soupape, les moyens électromagnétiques de déplacement étant commandés par des moyens d'asservissement à partir d'une caractéristique électrique de consigne. Le procédé comprend les étapes de :

  • commander les moyens électromagnétiques pour obtenir une vitesse de déplacement sensiblement constante de l'organe mobile entre la position extrême de fermeture et la position extrême d'ouverture,
  • obtenir des valeurs de la caractéristique électrique de consigne pour des positions intermédiaires de l'organe mobile,
  • détecter une position intermédiaire pour laquelle la caractéristique électrique de consigne subit une brusque variation.
For this purpose, there is provided, according to the invention, a method of determining a clearance between a valve stem of a heat engine and a movable member of an electromagnetic actuator comprising electromagnetic means for moving the movable member between a extreme position of opening and an extreme position of closure of the valve, the electromagnetic means of displacement being controlled by servo-control means from an electrical characteristic setpoint. The method comprises the steps of:
  • controlling the electromagnetic means to obtain a substantially constant speed of movement of the movable member between the extreme closed position and the extreme open position,
  • obtaining values of the electrical reference characteristic for intermediate positions of the movable member,
  • detecting an intermediate position for which the electrical reference characteristic undergoes a sudden variation.

En prenant exemple du courant comme caractéristique électrique de consigne, lorsque les moyens électromagnétiques provoquent un déplacement de l'organe mobile de la position extrême de fermeture à la position extrême d'ouverture, la brusque variation du courant de consigne est significative d'une augmentation brusque de l'effort résistant au déplacement de l'organe mobile. Cette augmentation de l'effort résistant, produite par le ressort de rappel de la soupape en position de fermeture qui tend à s'opposer au déplacement de la soupape vers la position d'ouverture, intervient au moment où l'organe mobile arrive au contact de la queue de soupape. Grâce au procédé de l'invention, cette brusque variation du courant de consigne est immédiatement mise en relation avec une position intermédiaire de l'organe mobile. Il est dès lors aisé, connaissant la position extrême de départ et cette position intermédiaire de l'organe mobile, d'en déduire précisément la valeur du jeu de distribution.Taking the example of the current as the electrical characteristic of setpoint, when the electromagnetic means cause a displacement of the movable member from the extreme position of closure to the extreme position of opening, the sudden variation of the setpoint current is significant of an increase abrupt resistance to the displacement of the movable member. This increase of the resistant force, produced by the spring return of the valve in the closed position which tends to oppose the displacement of the valve towards the open position, occurs at the moment when the movable member comes into contact with the valve stem. Thanks to the method of the invention, this sudden variation of the target current is immediately related to an intermediate position of the movable member. It is therefore easy, knowing the extreme starting position and this intermediate position of the movable member, to deduce precisely the value of the distribution set.

D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit d'un mode de mise en oeuvre particulier non limitatif de l'invention.Other characteristics and advantages of the invention will become apparent on reading the following description of a particular non-limiting embodiment of the invention.

Il sera fait référence à la figure unique annexée représentant schématiquement une soupape de moteur thermique associée à son dispositif d'actionnement.Reference will be made to the appended single figure schematically showing a thermal engine valve associated with its actuating device.

L'invention est ici décrite en application à l'actionnement d'une soupape 1 d'un moteur thermique portant la référence générale 2.The invention is here described in application to the actuation of a valve 1 of a heat engine with the general reference 2.

La soupape 1 possède une queue 3 et est montée sur une culasse 4 du moteur thermique 2 pour coulisser entre une position de fermeture dans laquelle la soupape est appliquée contre un siège 5 de la culasse 4 et une position d'ouverture dans laquelle la soupape est décollée du siège 5 de la culasse 4.The valve 1 has a shank 3 and is mounted on a cylinder head 4 of the engine 2 to slide between a closed position in which the valve is applied against a seat 5 of the cylinder head 4 and an open position in which the valve is detached from the seat 5 of the cylinder head 4.

La soupape est actionnée entre ces deux positions par l'intermédiaire d'un actionneur généralement désigné en 6 monté sur la culasse 4 du moteur thermique 2.The valve is actuated between these two positions via an actuator generally designated 6 mounted on the cylinder head 4 of the heat engine 2.

L'actionneur comprend un corps 7 dans lequel est monté pour coulisser un organe mobile généralement désigné en 8 comportant une tige 9 ayant une première extrémité 10 agencée pour prendre appui sur une extrémité libre de la queue 3 de la soupape 1 et une deuxième extrémité 11 solidaire d'une palette 12 reçue dans un logement 13 du corps 7 pour coulisser parallèlement à la tige 9.The actuator comprises a body 7 in which is mounted to slide a movable member generally designated 8 having a rod 9 having a first end 10 arranged to bear on a free end of the tail 3 of the valve 1 and a second end 11 secured to a pallet 12 received in a housing 13 of the body 7 to slide parallel to the rod 9.

Le corps 7 incorpore de façon connue en elle-même des moyens électromagnétiques de déplacement de l'organe mobile 8.The body 7 incorporates, in a manner known per se, electromagnetic means for moving the movable member 8.

Les moyens électromagnétiques comportent un électro-aimant 14 de maintien de la palette 12 dans une position dite position extrême de fermeture de la soupape et un électro-aimant 15 de maintien de la palette 12 dans une position dite position extrême d'ouverture de la soupape qui débouchent sur deux faces opposées du logement 13 du corps 7. La palette 12 est ici en contact avec l'électro-aimant 14, 15 lorsqu'elle est dans la position extrême correspondante.The electromagnetic means comprise an electromagnet 14 for holding the vane 12 in a position called the extreme closing position of the valve and an electromagnet 15 for holding the vane 12 in a position called the extreme open position of the valve which open on two opposite sides of the housing 13 of the body 7. The pallet 12 is here in contact with the electromagnet 14, 15 when it is in the corresponding extreme position.

Les électroaimants 14, 15 sont commandés de façon connue en elle-même via des moyens non représentés d'asservissement à partir d'un courant de consigne et d'une vitesse de déplacement de l'organe mobile 8. Ce mode d'asservissement est connu en lui-même. Cet asservissement peut être assuré par l'unité de contrôle moteur qui exploite également un signal de vitesse de la palette 12 obtenu par dérivation d'un signal de position fourni par un capteur de position 16 de la tige 9. Le capteur de position 16 est par exemple un capteur à effet Hall connu en lui-même.The electromagnets 14, 15 are controlled in a manner known per se by non-represented means of servocontrol from a setpoint current and a moving speed of the movable member 8. This servo mode is known in itself. This slaving can be ensured by the engine control unit which also operates a speed signal of the pallet 12 obtained by derivation of a position signal provided by a position sensor 16 of the rod 9. The position sensor 16 is for example a Hall effect sensor known in itself.

L'actionneur comprend également, de façon connue en soi, des moyens élastiques de déplacement.The actuator also comprises, in a manner known per se, elastic displacement means.

Les moyens élastiques de déplacement comprennent de façon connue en elle-même un ressort 17 intercalé entre une face 18 du corps 7 et un épaulement 19 de la tige 9 pour rappeler la palette 12 en position extrême d'ouverture et un ressort 20 intercalé entre une face 21 de la culasse 4 et un épaulement 22 de la queue de soupape 3 pour rappeler la soupape 1 en position de fermeture.The elastic displacement means comprise in a known manner in itself a spring 17 interposed between a face 18 of the body 7 and a shoulder 19 of the rod 9 to recall the pallet 12 in the extreme open position and a spring 20 interposed between a face 21 of the yoke 4 and a shoulder 22 of the valve stem 3 to return the valve 1 in the closed position.

L'actionneur, la culasse 4 et la soupape 1 sont agencés de telle manière que, lorsque la palette 12 est en position extrême de fermeture et la soupape 1 est appliquée contre son siège 5, il existe un jeu j ou jeu de distribution entre la première extrémité 10 de la tige 9 et l'extrémité libre de la queue de soupape 3.The actuator, the cylinder head 4 and the valve 1 are arranged in such a way that, when the pallet 12 is in the extreme closed position and the valve 1 is applied against its seat 5, there is a clearance j or set of distribution between the first end 10 of the rod 9 and the free end of the valve stem 3.

Le procédé conforme à l'invention permet de déterminer le jeu j durant le fonctionnement du moteur thermique.The method according to the invention makes it possible to determine the clearance j during the operation of the heat engine.

Le procédé conforme à l'invention comprend l'étape de commander les électroaimants 14, 15 pour déplacer avec une vitesse sensiblement constante l'organe mobile 8 de sa position extrême de fermeture vers sa position extrême d'ouverture. La vitesse de déplacement de l'organe mobile peut être maintenue constante jusqu'à la position extrême d'ouverture ou sur une distance supérieure à un jeu maximal possible compte tenu des caractéristiques géométriques de l'actionneur, de la soupape et de la culasse.The method according to the invention comprises the step of controlling the electromagnets 14, 15 to move with a substantially constant speed the movable member 8 from its extreme closed position to its extreme open position. The speed of movement of the movable member can be kept constant until the extreme open position or over a distance greater than a maximum possible clearance given the geometric characteristics of the actuator, the valve and the cylinder head.

Simultanément, le procédé comprend l'étape d'obtenir des valeurs du courant de consigne pour des positions intermédiaires de l'organe mobile pendant le déplacement de l'organe mobile 8 de la position extrême de fermeture à la position extrême d'ouverture et l'étape de détecter une position intermédiaire de l'organe mobile 8 pour laquelle le courant de consigne subit une brusque variation.Simultaneously, the method comprises the step of obtaining values of the target current for intermediate positions of the movable member during the displacement of the movable member 8 from the extreme closed position to the extreme open position and the step of detecting an intermediate position of the movable member 8 for which the setpoint current undergoes a sudden change.

Le courant de consigne est fourni par les moyens d'asservissement (mais il pourrait être mesuré ou détecté) et les positions intermédiaires de l'organe mobile 8 sont fournies par le capteur de position 16.The setpoint current is supplied by the servo-control means (but it could be measured or detected) and the intermediate positions of the movable member 8 are provided by the position sensor 16.

Le courant de consigne est alors mis en relation avec les positions intermédiaires de l'organe mobile 8.The setpoint current is then related to the intermediate positions of the movable member 8.

La détection de la position intermédiaire pour laquelle le courant de consigne subit une brusque variation est de préférence réalisée à partir de la dérivée du courant de consigne par rapport à la position de la palette 12. Lorsque cette dérivée est mise sous forme d'une courbe, la courbe présente des pics au niveau de la position intermédiaire correspondant au point de rencontre de l'organe mobile 8 et de la queue de soupape 3.The detection of the intermediate position for which the setpoint current undergoes a sudden change is preferably made from the derivative of the reference current relative to the position of the pallet 12. When this derivative is shaped as a curve, the curve has peaks at the intermediate position corresponding to the meeting point of the movable member 8 and the valve stem 3.

Connaissant la position extrême de fermeture, on en déduit la distance entre cette position extrême de fermeture et la position intermédiaire précitée. Cette distance correspond au jeu j.Knowing the extreme position of closure, we deduce the distance between the extreme position of closure and the aforementioned intermediate position. This distance corresponds to the game j.

Ainsi, lors du déplacement de l'organe mobile 8 de la position extrême de fermeture à la position extrême d'ouverture, les moyens électromagnétiques peuvent être commandés pour d'abord amener l'organe mobile 8 doucement jusqu'à la position intermédiaire déterminée ci-dessus pour mettre en contact l'organe mobile 8 et la queue de soupape 3, puis accélérer l'organe mobile 8 une fois celui-ci en appui contre la queue de soupape.Thus, during the displacement of the movable member 8 from the extreme closing position to the extreme open position, the electromagnetic means can be controlled to first bring the movable member 8 gently to the intermediate position determined herein. above to bring the movable member 8 into contact with the valve stem 3, then accelerate the movable member 8 once it bears against the valve stem.

Lors du déplacement de l'organe mobile 8 de la position extrême d'ouverture à la position extrême de fermeture, les moyens électromagnétiques peuvent être commandés pour d'abord amener l'organe mobile 8 rapidement jusqu'à la position intermédiaire déterminée ci-dessus pour avoir une fermeture rapide de la soupape, puis d'amener doucement l'organe mobile 8 en position extrême de fermeture pour limiter le bruit du contact de la palette 12 avec l'électroaimant 14.During the displacement of the movable member 8 from the extreme open position to the extreme closed position, the electromagnetic means can be controlled to first bring the movable member 8 quickly to the intermediate position determined above to have a quick closing of the valve, then gently bring the movable member 8 in extreme closed position to limit the noise of the contact of the pallet 12 with the electromagnet 14.

La détermination du jeu j est de préférence renouvelée périodiquement, par exemple toutes les secondes.The determination of the game j is preferably renewed periodically, for example every second.

Bien entendu, l'invention n'est pas limitée au mode de mise en oeuvre qui vient d'être décrit, mais englobe au contraire toute variante rentrant dans le cadre de l'invention définie par les revendications.Of course, the invention is not limited to the embodiment that has just been described, but on the contrary covers any variant within the scope of the invention defined by the claims.

En particulier, la détermination du jeu j peut être effectuée avec des modes d'opération différents selon le mode de fonctionnement du moteur et le régime moteur. Ainsi, la mise en oeuvre du procédé ci-dessus décrit n'interférant pas avec le fonctionnement normal de l'actionneur, il n'engendre pas de bruits supplémentaires et est donc particulièrement bien adapté à une utilisation à des régimes de ralenti. Un procédé de détermination qui provoquerait un fonctionnement plus bruyant de l'actionneur pourrait être utilisé lorsque le moteur est en mode de démarrage ou que le moteur est en mode de fonctionnement normal à un régime supérieur à un régime prédéterminé, par exemple 2000 tours / minutes.In particular, the clearance j can be determined with different modes of operation depending on the engine operating mode and the engine speed. Thus, the implementation of the method described above does not interfere with the normal operation of the actuator, it does not generate additional noise and is therefore particularly suitable for use at idle speeds. A determination method that would cause more noisy operation of the actuator could be used when the engine is in start mode or the engine is in normal operating mode at a higher speed than a predetermined speed, for example 2000 rpm .

En outre, le procédé de l'invention peut être réalisé pour un déplacement de l'organe mobile vers la position extrême d'ouverture comme décrit ci-dessus ou vers la position extrême de fermeture. Dans ce dernier cas, la vitesse de déplacement de l'organe mobile sera maintenue sensiblement constante par exemple à partir d'une position intermédiaire médiane de la palette.In addition, the method of the invention can be realized for a displacement of the movable member towards the extreme open position as described above or towards the extreme closed position. In the latter case, the moving speed of the movable member will be kept substantially constant, for example from a median intermediate position of the pallet.

Par ailleurs, les moyens électromagnétiques peuvent être commandés à partir d'une autre caractéristique électrique comme une tension de consigne.Moreover, the electromagnetic means can be controlled from another electrical characteristic such as a set voltage.

Claims (4)

  1. Method of determining a clearance between a stem (3) of a valve (1) of a combustion engine (2) and a movable member (8) of an electromagnetic actuator (7) comprising electromagnetic means (14, 15) for moving the movable member between an end position for opening the valve and an end position for closing the valve, the electromagnetic movement means being controlled by servo-control means on the basis of an electrical reference characteristic, characterized in that it comprises the steps of:
    - controlling the electromagnetic means to obtain a substantially constant speed of movement of the movable member between the end closure position and the end opening position,
    - obtaining values of the electrical reference characteristic for intermediate positions of the movable member,
    - detecting an intermediate position for which the electrical reference characteristic is subject to a sudden variation.
  2. Method according to Claim 1, characterized in that the detection comprises a phase of calculating a derivative of the electrical reference characteristic with respect to the position of the movable member (8).
  3. Method according to Claim 1 or Claim 2, characterized in that the electrical reference characteristic is a current.
  4. Method according to any one of Claims 1 to 3, characterized in that the speed of movement of the movable member is kept substantially constant over a part of the movement corresponding to a maximum clearance.
EP20030750797 2002-07-25 2003-07-10 Method of determining a clearance Expired - Fee Related EP1525375B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0209434 2002-07-25
FR0209434A FR2842862B1 (en) 2002-07-25 2002-07-25 METHOD FOR DETERMINING A DISTRIBUTION GAME FROM AN ELECTRICAL POSITION / CHARACTERISTIC TORQUE
PCT/FR2003/002170 WO2004016912A1 (en) 2002-07-25 2003-07-10 Method of determining a clearance

Publications (2)

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EP1525375A1 EP1525375A1 (en) 2005-04-27
EP1525375B1 true EP1525375B1 (en) 2009-02-11

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JP (1) JP4048201B2 (en)
DE (1) DE60326145D1 (en)
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WO (1) WO2004016912A1 (en)

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WO2004016912A1 (en) 2004-02-26
EP1525375A1 (en) 2005-04-27
FR2842862B1 (en) 2006-03-03
DE60326145D1 (en) 2009-03-26
JP2006501391A (en) 2006-01-12
FR2842862A1 (en) 2004-01-30
JP4048201B2 (en) 2008-02-20
US7121525B2 (en) 2006-10-17
US20050269536A1 (en) 2005-12-08

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