EP0052026A1 - Automatic choke device for a two-stage carburettor - Google Patents

Automatic choke device for a two-stage carburettor Download PDF

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Publication number
EP0052026A1
EP0052026A1 EP81401579A EP81401579A EP0052026A1 EP 0052026 A1 EP0052026 A1 EP 0052026A1 EP 81401579 A EP81401579 A EP 81401579A EP 81401579 A EP81401579 A EP 81401579A EP 0052026 A1 EP0052026 A1 EP 0052026A1
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EP
European Patent Office
Prior art keywords
lever
carburetor
automatic choke
engine
choke device
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.)
Granted
Application number
EP81401579A
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German (de)
French (fr)
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EP0052026B1 (en
Inventor
Jean-Pierre Kervinio
André Nartowski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0052026A1 publication Critical patent/EP0052026A1/en
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Publication of EP0052026B1 publication Critical patent/EP0052026B1/en
Expired legal-status Critical Current

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    • 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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
    • F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat
    • 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
    • F02M11/00—Multi-stage carburettors, Register-type carburettors, i.e. with slidable or rotatable throttling valves in which a plurality of fuel nozzles, other than only an idling nozzle and a main one, are sequentially exposed to air stream by throttling valve
    • F02M11/02—Multi-stage carburettors, Register-type carburettors, i.e. with slidable or rotatable throttling valves in which a plurality of fuel nozzles, other than only an idling nozzle and a main one, are sequentially exposed to air stream by throttling valve with throttling valve, e.g. of flap or butterfly type, in a later stage opening automatically

Definitions

  • the present invention is in the field of carburetors for internal combustion engines, and more specifically relates to an automatic choke device intended to be incorporated into a carburetor, in particular a double-barrel carburetor.
  • Bimetal type automatic starters currently mounted on the carburetors are intended to perform two functions at the same time, namely to supply the engine at the start to ensure a given speed when empty and on the other hand to allow starting. when the vehicle is cold, until a given engine temperature is obtained, for example of the order of 80 ° C.
  • These two functions being ensured by a single mechanism, it is very difficult to obtain a good adaptation of the richness of the mixture for running in transient regime, this richness being too important in stabilized regime and in idle mode, which translates by a diet that is too important when stopped.
  • the automatic choke device for carburetor comprising at least two bodies according to the present invention is characterized in that it comprises an arrangement for controlling the flaps of the carburetor bodies cooperating with a control arrangement for the throttle valve of the second carburetor body, each arrangement being actuated by the combined action of a thermosensitive element and a pressure gradient applied thereto from the vacuum manifold via a pneumatic member.
  • the carburetor on which is mounted the automatic choke device according to the present invention consists of two bodies A and B, the mechanical control of the butterflies, which is not the subject of the invention, not being shown in the drawing.
  • the automatic choke device according to the invention consists of two arrangements, one of which is mounted on the first carburetor body A and the other on the second body B.
  • the arrangement mounted on the body A is more precisely designed to adjust the opening of the flaps 3, 4.
  • This arrangement consists of a rotary lever 1 whose position is com controlled by a heat-sensitive element, of the bimetallic strip type, the travel of which is adjusted as a function of the engine temperature.
  • the lever 1 is connected to the axis 23 of the flaps 3 and 4 by a tie rod 5, itself articulated to a control rod 5a secured to said axis 23.
  • the lever 1 is directly connected to the lower end, provided with a notch 7, a rod 6 which, by its opposite end, is secured to the membrane 8 of a pressure capsule 9, comprising in its upper compartment a spring 10 intended to exert a given force on the membrane 8
  • Adjustment means in the form of a stop 11 are mounted in the pressure capsule 9, the upper compartment of which communicates with the intake manifold by a flexible conduit, pressure delay means, for example in the form of 'A regulator housing 12, being disposed between the pressure capsule 9 and the intake manifold.
  • the second arrangement installed on the second body B of the carburettor aims to provide a volume of air necessary for starting the engine and for making it run empty by acting on the throttle valve.
  • This arrangement comprises a cam 13 whose angular position is controlled by a thermosensitive element 14 whose movement is regulated as a function of the temperature of the engine.
  • This cam 13 is intended to limit the complete closure of the throttle valve 25 of the second body B of the carburetor by means of a push rod 16, articulated by one of its ends to a lever 15 secured to the throttle shaft 25.
  • a lever 17 at the end of which is provided an adjustable stop 18 intended to come into contact with the cam 13.
  • the other end of the push rod 16 is connected to the membrane 19 d '' a pressure capsule 20 whose compartment on the side of the rod 16 is subjected to atmospheric pressure while the other compartment, in which is mounted a spring 21 intended to apply a force to the membrane 19 and to control the opening of the throttle valve 25, communicates by a nozzle 22 and a flexible conduit with the intake manifold.
  • a nozzle 22 In the part of the housing subjected to atmospheric pressure is disposed an adjustment stop 28.
  • the diffusers 26 and 24 are shown in the carburetor bodies A and B respectively.
  • the automatic choke device according to the invention operates in the following manner
  • the spring 21 by means of the rod 16 pushes the lever 15 and causes a certain opening of the butterfly 27 of the second body B.
  • the value of this opening is given by the adjustable stop 28. This value is established during setting point of the choke device.
  • the bimetallic strip 2 On the first body, the bimetallic strip 2, by means of the lever 1 and the tie rod 5, turns the axis of the flap 23 and closes the flaps of the first and second body 3 and 40
  • the membrane 8 compresses the spring 10 and the rod 6 turns the lever 1 which, consequently, opens the flaps 3 and 4. This position of the system is shown in FIGS. 3 and 4.
  • the engine is supplied with fuel in this position via the idle circuits of the first and second bodies. These circuits are not shown in the drawings. If the quantity of fuel is not sufficient, it can be increased by changing the idle jet of the second body, without causing the increase in consumption in hot running.
  • FIGs 5 and 6 are shown the components of the automatic choke at the time of acceleration.
  • the throttle valve of the first body 27 or also of the second body 25 is opened if the acceleration is strong.
  • the engine vacuum drops quickly.
  • the vacuum in the upper part of the case 9 decreases as quickly because the delay unit 12 does not work in this direction.
  • the spring 10 pushes the rod 6, the bimetallic strip 2 turns the lever 1 and the tie 5 closes the flaps 3 and 4.
  • the vacuum under the flap of the first body increases rapidly, which causes a strong fuel flow, by the diffuser 26 Once the vehicle speed has stabilized, the engine vacuum increases and flaps 3 and 4 are in the open position presented on plate 2.
  • the second body B with its own constituent elements is not shown in Figures 5 and 6, because in this operating phase the second body plays no role.
  • the bimetallic strip 2 keeps the flaps 3 and 4 in the open position and the bimetallic strip 14 turns the cam 13. Consequently, the rod 16 takes a position such that the butterfly 25 of the second body B is completely closed. To obtain this position, it is necessary to act on the setting of the spring 21 and of the return spring of the second body.
  • the system on the second body opens the butterfly 25 of the second body B.
  • the depression of the engine withdraws the rod 16 via the membrane 19 and the butterfly 25 of the second body B is closed Idling is ensured by the fixed position of the butterfly 27 of the first body A.
  • the invention is in no way limited to the embodiment described above, of which it encompasses all the modifications and variants within the reach of ordinary skill in the art. This is how one could envisage a stitching downstream of the butterfly of the second body in place of the connection to the intake manifold or in association with the latter.

Abstract

L'invention concerne un dispositif de starter automatique pour carburateur comportant au moins deux corps. Ce dispositif comporte un agencement de commande des volets (3, 4) des corps (A, B) de carburateur coopérant avec un agencement de commande (13, 14, 16) du papillon du second corps (B) de carburateur, chaque agencement étant actionné par l'action conjuguée d'un élément thermosensible (14) et d'un gradient de pression qui lui est appliqué à partir du collecteur de dépression par l'intermédiaire d'un organe pneumatique (20).The invention relates to an automatic choke device for a carburetor comprising at least two bodies. This device comprises an arrangement for controlling the flaps (3, 4) of the carburetor bodies (A, B) cooperating with a control arrangement (13, 14, 16) of the throttle valve of the second carburetor body, each arrangement being actuated by the combined action of a thermosensitive element (14) and a pressure gradient applied thereto from the vacuum manifold via a pneumatic member (20).

Description

La présente invention est du domaine des carburateurs pour moteurs à combustion interne, et vise plus précisément un dispositif de starter automatique destiné à être incorporé à un carburateur, notamment un carburateur à double corps.The present invention is in the field of carburetors for internal combustion engines, and more specifically relates to an automatic choke device intended to be incorporated into a carburetor, in particular a double-barrel carburetor.

Les starters automatiques du type à bilame actuellement montés sur les carburateurs sont destinés à assurer deux fonctions en même temps, à savoir d'alimenter au départ le moteur pour lui assurer un régime donné à vide et d'autre part de permettre la mise en marche à froid du véhicule, jusqu'à obtenir une température donnée du moteur, par exemple de l'ordre de 80°C. Ces deux fonctions étant assurées par un seul mécanisme, il est très difficile d'obtenir une bonne adaptation de la richesse du mélange pour le roulage en régime transitoire, cette richesse étant trop importe en régime stabilisé et en marche à vide, ce qui se traduit par un régime trop important à l'arrêt.Bimetal type automatic starters currently mounted on the carburetors are intended to perform two functions at the same time, namely to supply the engine at the start to ensure a given speed when empty and on the other hand to allow starting. when the vehicle is cold, until a given engine temperature is obtained, for example of the order of 80 ° C. These two functions being ensured by a single mechanism, it is very difficult to obtain a good adaptation of the richness of the mixture for running in transient regime, this richness being too important in stabilized regime and in idle mode, which translates by a diet that is too important when stopped.

La présente invention vise à obvier à tous ces inconvénients en fournissant un dispositif de starter automatique adaptable aux carburateurs à double ou quadruple corps et présentant en outre les avantages s

  • - d'être 100 % automatique sans avoir besoin d'être armé avant fonctionnement
  • - de réaliser une diminution du régime du moteur après le départ, et ce de façon immédiate et automatique ;
  • - de supprimer les inconvénients dus au fait que, pour satisfaire aux normes anti-pollution et obtenir une consommation minimale à basse vitesse, la richesse réglée pour le premier corps de carburateur est si faible que le débit d'essence à froid est insuffisant pour le démarrage du moteur, ce qui oblige à utiliser soit des gicleurs auxiliaires électromagnétiques soit des dispositifs enrichisseurs spéciaux commandés par la température, ces inconvénients étant supprimés grâce au fait que le dispositif de starter selon l'invention permet de faire démarrer le moteur sur le second corps du carburateur ;
  • - de rendre possible l'élimination du volet de départ après le démarrage du moteur à marche à vide et en charge, dès que la vitesse du véhicule est stabilisée, ce qui se traduit par une économie de carburant ;
  • - d'éliminer le volet très rapidement tout en gardant l'ouverture positive du second corps le temps approprié pour s'affranchir des calages au moment du braquage par exemple, si le moteur n'a pas atteint sa température normale, et de
  • - dessolidariser les problèmes de départ à froid proprement dit et la marche à vide du moteur par rapport à sa marche en charge.
The present invention aims to overcome all these drawbacks by providing an automatic choke device adaptable to double or quadruple body carburetors and also having the advantages s
  • - to be 100% automatic without needing to be armed before operation
  • - achieve a reduction in engine speed after departure, and this immediately and automatically;
  • - to remove the drawbacks due to the fact that, in order to meet anti-pollution standards and obtain a minimum consumption at low speed, the richness adjusted for the first carburetor body is so low that the flow rate of cold fuel is insufficient for the engine start, which requires the use of either electromagnetic auxiliary jets or special enrichment devices controlled by temperature, these drawbacks being eliminated thanks to the fact that the choke device according to the invention makes it possible to start the engine on the second body of the carburetor;
  • - to make possible the elimination of the starting flap after starting the engine when idling and under load, as soon as the vehicle speed is stabilized, which results in fuel economy;
  • - to eliminate the flap very quickly while keeping the positive opening of the second body for the appropriate time to overcome stalling at the time of steering, for example, if the engine has not reached its normal temperature, and
  • - dissociate the problems of cold start proper and the idling of the engine compared to its running under load.

Le dispositif de starter automatique pour carburateur comportant au moins deux corps selon la présente invention est caractérisé par le fait qu'il comporte un agencement de commande des volets des corps de carburateur coopérant avec un agencement de commande du papillon du second corps de carburateur, chaque agencement étant actionné par l'action conjuguée d'un élément thermosensible et d'un gradient de pression qui lui est appliqué à partir du collecteur de dépression par l'intermédiaire d'un organe pneumatique.The automatic choke device for carburetor comprising at least two bodies according to the present invention is characterized in that it comprises an arrangement for controlling the flaps of the carburetor bodies cooperating with a control arrangement for the throttle valve of the second carburetor body, each arrangement being actuated by the combined action of a thermosensitive element and a pressure gradient applied thereto from the vacuum manifold via a pneumatic member.

Le dispositif de starter automatique selon l'invention est en outre remarquable par les points suivants 1

  • - l'agencement de commande des volets est constitué d'un levier rotatif articulé à une extrémité d'un tirant dont l'autre extrémité est articulée à un levier de commande solidaire de l'axe des volets, la position du levier et par voie de conséquence des volets étant commandée d'une part par un premier élément thermosensible du type bilame, dont le débattement est fonction de la température du moteur, et d'autre part par une tige dont une des extrémités est connectée au levier, tandis que l'autre extrémité est solidarisée à la membrane d'un premier organe pneumatique ;
  • - l'agencement de commande du papillon du second corps de carburateur est constitué d'une came dont le déplacement angulaire est commandé par un second organe thermosensible du type bilame à débattement fonction de la température du moteur, cette came étant destinée à venir au contact d'une butée réglable montée à l'extrémité d'un levier dont l'autre extrémité est solidarisée à une tige de commande, cette dernière étant par une de ses extrémités articulée à un levier solidaire de l'axe du papillon tandis que l'autre extrémité est solidarisée & la membrane d'un second organe pneumatique ;
  • - les premier et second organes pneumatiques sont des capsules manométriques dont le compartiment traversé par les tiges de commande est à la pression atmosphérique tandis que l'autre, renfermant les ressorts de rappel des membranes respectives, est relié par un conduit souple au collecteur d'admission, des éléments de réglage ou butées étant montés respectivement sur les capsules
  • - des moyens de retardement d'arrivée de la dépression sont montés entre la capsule manométrique et le collecteur d'ad- missiono
The automatic choke device according to the invention is further remarkable by the following points 1
  • - the shutter control arrangement consists of a lever rotary articulated at one end of a tie rod whose other end is articulated to a control lever secured to the axis of the flaps, the position of the lever and consequently of the flaps being controlled on the one hand by a first element thermosensitive of the bimetallic strip type, the travel of which depends on the temperature of the engine, and on the other hand by a rod one end of which is connected to the lever, while the other end is secured to the membrane of a first pneumatic member ;
  • - The throttle control arrangement of the second carburetor body consists of a cam, the angular displacement of which is controlled by a second thermosensitive member of the bimetallic strip type with movement depending on the temperature of the engine, this cam being intended to come into contact an adjustable stop mounted at the end of a lever, the other end of which is secured to a control rod, the latter being by one of its ends articulated to a lever secured to the axis of the butterfly while the the other end is joined to the membrane of a second pneumatic member;
  • - the first and second pneumatic members are pressure capsules, the compartment through which the control rods pass is at atmospheric pressure while the other, containing the return springs of the respective membranes, is connected by a flexible conduit to the manifold inlet, adjusting elements or stops being mounted respectively on the capsules
  • - means for delaying the arrival of the vacuum are fitted between the manometric capsule and the intake manifold

La présente invention sera mieux comprise à la lecture de la description suivante d'une forme de réalisation non limitative de starter automatique, en référence aux dessins annexés dans lesquels t

  • - la figure 1 est une vue en coupe du dispositif de starter selon l'invention, appliqué à un carburateur double-corps
  • - la figure 2 est une vue partielle en coupe selon la ligne II-II de la figure 1 ;
  • - la figure 3 est une vue en coupe, analogue à la figure 2 mais à un premier stade de fonctionnement du starter auto- matiqne ;
  • - la figure 4 est une vue partielle en coupe selon la ligne IV-IV de la figure 3 ;
  • - la figure 5 est une vue partielle en coupe d'un premier corps de carburateur, à un second stade de fonctionnement du starter automatique et
  • - la figure 6 est une vue en coupe axiale selon la ligne VI-VI de la figure 5.
The present invention will be better understood on reading the following description of a nonlimiting embodiment automatic choke, with reference to the accompanying drawings in which t
  • - Figure 1 is a sectional view of the choke device according to the invention, applied to a double-barrel carburetor
  • - Figure 2 is a partial sectional view along the line II-II of Figure 1;
  • - Figure 3 is a sectional view, similar to Figure 2 but at a first stage of operation of the automatic choke;
  • - Figure 4 is a partial sectional view along the line IV-IV of Figure 3;
  • FIG. 5 is a partial sectional view of a first carburetor body, at a second stage of operation of the automatic choke, and
  • FIG. 6 is a view in axial section along the line VI-VI of FIG. 5.

Le carburateur sur lequel est monté le dispositif de starter automatique selon la présente invention est constitué de deux corps A et B, la commande mécanique des papillons, qui ne fait pas l'objet de l'invention, n'étant pas représentée au dessin.The carburetor on which is mounted the automatic choke device according to the present invention consists of two bodies A and B, the mechanical control of the butterflies, which is not the subject of the invention, not being shown in the drawing.

Le dispositif de starter automatique selon l'invention se compose de deux agencements dont l'un est monté sur le premier corps A de carburateur et l'autre sur le second corps B.The automatic choke device according to the invention consists of two arrangements, one of which is mounted on the first carburetor body A and the other on the second body B.

L'agencement monté sur le corps A est plus précisément conçu pour régler l'ouverture des volets 3, 4. Cet agencement est constitué par un levier rotatif 1 dont la position est commandée par un élément thermosensible, du type bilame, dont le débattement est réglé en fonction de la température du moteur. Le levier 1 est relié à l'axe 23 des volets 3 et 4 par un tirant 5, lui-même articulé à une tige de commande 5a solidaire dudit axe 23. Par ailleurs, le levier 1 est relié directement a l'extrémité inférieure, pourvue d'une encoche 7, d'une tige 6 qui, par son extrémité opposée, est solidarisée a la membrane 8 d'une capsule manométrique 9, comportant dans son compartiment supérieur un ressort 10 destiné à exercer une force donnée sur la membrane 8. Des moyens de réglage sous la forme d'une butée 11 sont montés dans la capsule manométrique 9, dont le compartiment supérieur communique avec le collecteur d'admission par un conduit souple, des moyens de retardement de pression, par exemple sous la forme d'un boîtier régulateur 12, étant disposés entre la capsule manométrique 9 et le collecteur d'admission. Cet agencement permet d'obtenir la richesse nécessaire du mélange pour tous les régimes de fonctionnement du moteur, comme cela sera exposé dans ce qui suit.The arrangement mounted on the body A is more precisely designed to adjust the opening of the flaps 3, 4. This arrangement consists of a rotary lever 1 whose position is com controlled by a heat-sensitive element, of the bimetallic strip type, the travel of which is adjusted as a function of the engine temperature. The lever 1 is connected to the axis 23 of the flaps 3 and 4 by a tie rod 5, itself articulated to a control rod 5a secured to said axis 23. Furthermore, the lever 1 is directly connected to the lower end, provided with a notch 7, a rod 6 which, by its opposite end, is secured to the membrane 8 of a pressure capsule 9, comprising in its upper compartment a spring 10 intended to exert a given force on the membrane 8 Adjustment means in the form of a stop 11 are mounted in the pressure capsule 9, the upper compartment of which communicates with the intake manifold by a flexible conduit, pressure delay means, for example in the form of 'A regulator housing 12, being disposed between the pressure capsule 9 and the intake manifold. This arrangement makes it possible to obtain the necessary richness of the mixture for all the engine operating regimes, as will be explained below.

Le second agencement installé sur le second corps B du carburateur vise à assurer un volume d'air nécessaire pour le démarrage du moteur et pour le faire tourner à vide en agissant sur le papillon. Cet agencement comporte une came 13 dont la position angulaire est commandée par un élément thermosensible 14 dont le débattement est régulé en fonction de la température du moteur. Cette came 13 est destinée a limiter la fermeture complète du papillon 25 du second corps B du carburateur par l'intermédiaire d'une tige-poussoir 16, articulée par une de ses extrémités à un levier 15 solidaire de l'axe de papillon 25. A cette tige-poussoir 16 est solidarisé un levier 17, à l'extrémité duquel est prévue une butée réglable 18 destinée à venir au contact de la came 13. L'autre extrémité de la tige-poussoir 16 est reliée à la membrane 19 d'une capsule manométrique 20 dont le compartiment du côté de la tige 16 est soumis à la pression atmosphérique tandis que l'autre compartiment, dans lequel est monté un ressort 21 destiné à appliquer une force sur la membrane 19 et à commander l'ouverture du papillon 25, communique par un embout 22 et un conduit souple avec le collecteur d'admission. Dans la partie du boîtier soumise à la pression atmosphérique est disposée une butée de réglage 28. Dans les corps de carburateur A et B sont respectivement représentés les diffuseurs 26 et 24.The second arrangement installed on the second body B of the carburettor aims to provide a volume of air necessary for starting the engine and for making it run empty by acting on the throttle valve. This arrangement comprises a cam 13 whose angular position is controlled by a thermosensitive element 14 whose movement is regulated as a function of the temperature of the engine. This cam 13 is intended to limit the complete closure of the throttle valve 25 of the second body B of the carburetor by means of a push rod 16, articulated by one of its ends to a lever 15 secured to the throttle shaft 25. To this push rod 16 is secured a lever 17, at the end of which is provided an adjustable stop 18 intended to come into contact with the cam 13. The other end of the push rod 16 is connected to the membrane 19 d '' a pressure capsule 20 whose compartment on the side of the rod 16 is subjected to atmospheric pressure while the other compartment, in which is mounted a spring 21 intended to apply a force to the membrane 19 and to control the opening of the throttle valve 25, communicates by a nozzle 22 and a flexible conduit with the intake manifold. In the part of the housing subjected to atmospheric pressure is disposed an adjustment stop 28. In the carburetor bodies A and B are shown the diffusers 26 and 24 respectively.

Le dispositif de starter automatique selon l'invention fonctionne de la manière suivanteThe automatic choke device according to the invention operates in the following manner

Avant d'actionner le moteur au démarreur, la position des éléments constitutifs du starter est représentée sur les figures 1 et 2.Before actuating the engine at the starter, the position of the constituent elements of the choke is shown in Figures 1 and 2.

Le ressort 21 par l'intermédiaire de la tige 16 pousse le levier 15 et provoque une certaine ouverture du papillon 27 du second corps B. La valeur de cette ouverture est donnée par la butée réglable 28. Cette valeur est établie lors de la mise au point du dispositif de starter.The spring 21 by means of the rod 16 pushes the lever 15 and causes a certain opening of the butterfly 27 of the second body B. The value of this opening is given by the adjustable stop 28. This value is established during setting point of the choke device.

Dans cette position, le ressort 21 a seulement à vaincre l'effort du ressort de rappel du papillon du second corps.In this position, the spring 21 only has to overcome the force of the return spring of the butterfly of the second body.

Sur le premier corps, le bilame 2, par l'intermédiaire du levier 1 et du tirant 5, tourne l'axe du volet 23 et ferme les volets des premier et second corps 3 et 40On the first body, the bimetallic strip 2, by means of the lever 1 and the tie rod 5, turns the axis of the flap 23 and closes the flaps of the first and second body 3 and 40

Dès que le moteur tourne sur le démarreur, la dépression du moteur se transmet sous le volet 4 du second corps B, ce qui provoque l'écoulement d'essence par le diffuseur 24 du second corps B. Le diffuseur 26 du premier corps A ne débite pas car le papillon est fermé. La dépression du moteur sur le démarreur est si faible qu'elle ne peut pas faire actionner les membranes 8 et 19.As soon as the engine turns on the starter, the depression of the engine is transmitted under the flap 4 of the second body B, which causes the flow of petrol through the diffuser 24 of the second body B. The diffuser 26 of the first body A does not not flow because the butterfly is closed. The motor vacuum on the starter is so low that it cannot activate the membranes 8 and 19.

Une fois que le moteur est parti, la dépression augmente et la membrane 19 comprime le ressort 21 et tire le levier 16 jusqu'à ce que la butée 18 entre en contact avec la came 13. Le papillon 25 du second corps B tourne vers le sens de la flèche F1 et diminue le passage d'air. Le régime du moteur baisse automatiquement.Once the engine is started, the vacuum increases and the membrane 19 compresses the spring 21 and pulls the lever 16 until the stop 18 comes into contact with the cam 13. The butterfly 25 of the second body B turns towards the direction of arrow F 1 and decreases the passage of air. The engine speed drops automatically.

Dans cette phase, la dépression augmentée du moteur réagit sur la membrane 8. La vitesse d'augmentation de cette dépression qui fait fonctionner la membrane est réduite par 1e bottier de retardement 12.In this phase, the increased vacuum of the motor reacts on the diaphragm 8. The speed of increase of this vacuum which operates the diaphragm is reduced by the delaying boot 12.

La membrane 8 comprime le ressort 10 et la tige 6 tourne le levier 1 qui, en conséquence, ouvre les volets 3 et 4. Cette position du système est représentée sur les figures 3 et 4.The membrane 8 compresses the spring 10 and the rod 6 turns the lever 1 which, consequently, opens the flaps 3 and 4. This position of the system is shown in FIGS. 3 and 4.

L'alimentation du moteur en carburant dans cette position se fait par les circuits de ralenti des premier et second corps. Ces circuits ne sont pas représentés aux dessins. Si la quantité de carburant n'est pas suffisante, on peut l'augmenter par le changement de gicleur de ralenti du second corps, sans provoquer l'augmentation de consommation en marche à chaud.The engine is supplied with fuel in this position via the idle circuits of the first and second bodies. These circuits are not shown in the drawings. If the quantity of fuel is not sufficient, it can be increased by changing the idle jet of the second body, without causing the increase in consumption in hot running.

Sur les figures 5 et 6 sont représentés les éléments constitutifs du starter automatique au moment de l'accélération. Dans cette phase, on ouvre le papillon du premier corps 27 ou bien aussi du second corps 25 si l'accélération est forte. La dépression du moteur tombe rapidement. La dépression dans la partie supérieure du bottier 9 diminue aussi rapidement car le boîtier de retardement 12 ne marche pas dans ce sens. Le ressort 10 repousse la tige 6, le bilame 2 tourne le levier 1 et le tirant 5 ferme les volets 3 et 4. La dépression sous le volet du premier corps augmente rapidement ce qui provoque un débit d'essence fort, par le diffuseur 26. Une fois que la vitesse du véhicule est stabilisée, la dépression du moteur augmente et les volets 3 et 4 sont dans la position ouverte présentée sur la planche 2.Figures 5 and 6 are shown the components of the automatic choke at the time of acceleration. In this phase, the throttle valve of the first body 27 or also of the second body 25 is opened if the acceleration is strong. The engine vacuum drops quickly. The vacuum in the upper part of the case 9 decreases as quickly because the delay unit 12 does not work in this direction. The spring 10 pushes the rod 6, the bimetallic strip 2 turns the lever 1 and the tie 5 closes the flaps 3 and 4. The vacuum under the flap of the first body increases rapidly, which causes a strong fuel flow, by the diffuser 26 Once the vehicle speed has stabilized, the engine vacuum increases and flaps 3 and 4 are in the open position presented on plate 2.

Le second corps B avec ses éléments constitutifs propres n'est pas représenté aux figures 5 et 6, car dans cette phase de fonctionnement le second corps ne joue aucun r8le.The second body B with its own constituent elements is not shown in Figures 5 and 6, because in this operating phase the second body plays no role.

Si l'ouverture totale des volets 3 et 4 est trop importante pour assurer le bon fonctionnement du véhicule, on peut la limiter par la butée 11.If the total opening of the flaps 3 and 4 is too large to ensure the proper functioning of the vehicle, it can be limited by the stop 11.

Dès que le moteur atteint la température normale de marche à chaud, le bilame 2 maintient les volets 3 et 4 dans la position ouverte et le bilame 14 tourne la came 13. En conséquence, la tige 16 prend une position telle que le papillon 25 du second corps B est complètement fermé. Pour obtenir cette position, il faut jouer sur le tarage du ressort 21 et du ressort de rappel du second corps.As soon as the engine reaches the normal hot running temperature, the bimetallic strip 2 keeps the flaps 3 and 4 in the open position and the bimetallic strip 14 turns the cam 13. Consequently, the rod 16 takes a position such that the butterfly 25 of the second body B is completely closed. To obtain this position, it is necessary to act on the setting of the spring 21 and of the return spring of the second body.

Pour le départ, le moteur chaud, le système monté sur le premier corps est éliminé, car le bilame 2 maintient les volets 3 et 4 dans la position ouverte.For the start, the engine warm, the system mounted on the first body is eliminated, because the bimetallic strip 2 keeps the flaps 3 and 4 in the open position.

Par contre, le système sur le second corps ouvre le papillon 25 du second corps B. Une fois que le moteur est parti, la dépression du moteur retire la tige 16 par l'intermédiaire de la membrane 19 et le papillon 25 du second corps B est ferméo Le ralenti est assuré par la position fixe du papillon 27 du premier corps A.On the other hand, the system on the second body opens the butterfly 25 of the second body B. Once the engine is started, the depression of the engine withdraws the rod 16 via the membrane 19 and the butterfly 25 of the second body B is closed Idling is ensured by the fixed position of the butterfly 27 of the first body A.

L'invention n'est nullement limitée à la forme de réalisation décrite ci-dessus, dont elle englobe toutes les modifications et variantes à la portée de l'homme de l'art. C'est ainsi qu'on pourrait envisager un piquage en aval du papillon du second corps à la place du raccord au collecteur d'admission ou en association avec ce dernier.The invention is in no way limited to the embodiment described above, of which it encompasses all the modifications and variants within the reach of ordinary skill in the art. This is how one could envisage a stitching downstream of the butterfly of the second body in place of the connection to the intake manifold or in association with the latter.

Claims (5)

1. Dispositif de starter automatique pour carburateur comportant au moins deux corps, caractérisé par le fait qu'il comporte un agencement de commande (1, 2, 5) des volets (3, 4) des corps (A, B) de carburateur coopérant avec un agencement de commande (13, 14, 16) du papillon du second corps (B) de carburateur, chaque agencement étant actionné par l'action conjuguée d'un élément thermosensible (2, 14) et d'un gradient de pression qui lui est appliqué à partir du collecteur de dépression par l'intermédiaire d'un organe pneumatique (9, 20).1. Automatic choke device for carburetor comprising at least two bodies, characterized in that it comprises a control arrangement (1, 2, 5) of the flaps (3, 4) of the cooperating carburetor bodies (A, B) with a control arrangement (13, 14, 16) of the throttle valve of the second carburetor body (B), each arrangement being actuated by the combined action of a heat-sensitive element (2, 14) and a pressure gradient which it is applied to it from the vacuum manifold via a pneumatic member (9, 20). 2. Dispositif de starter automatique selon la revendication 1, caractérisé par le fait que l'agencement de commande des volets (3, 4) est constitué d'un levier rotatif (1) articulé à une extrémité d'un tirant (5) dont l'autre extrémité est articulée à un levier de commande (5a) solidaire de l'axe (23) des volets (3, 4), la position du levier (1) et par voie de conséquence des volets (3, 4) étant commandée d'une part par un premier élément thermosensible du type bilame (2), dont le débattement est fonction de la température du moteur, et d'autre part par une tige (6) dont une des extrémités est connectée au levier (1), tandis que l'autre extrémité est solidarisée à la membrane (8) d'un premier organe pneumatique (9).2. Automatic choke device according to claim 1, characterized in that the flap control arrangement (3, 4) consists of a rotary lever (1) articulated at one end of a tie rod (5), the other end is articulated to a control lever (5a) integral with the axis (23) of the flaps (3, 4), the position of the lever (1) and consequently of the flaps (3, 4) being controlled on the one hand by a first heat-sensitive element of the bimetallic strip type (2), the travel of which depends on the temperature of the engine, and on the other hand by a rod (6) one end of which is connected to the lever (1) , while the other end is secured to the membrane (8) of a first pneumatic member (9). 3. Dispositif de starter automatique selon la revendication 1, caractérisé par le fait que l'agencement de commande du papillon (25) du second corps (B) de carburateur est constitué d'une came (13) dont le déplacement angulaire est commandé par un second organe thermosensible du type bilame (14) à débattement fonction de la température du moteur, cette came étant destinée à venir au contact d'une butée réglable (18) montée à l'extrémité d'un levier (17) dont l'autre extrémité est solidarisée à une tige de commande (16), cette dernière étant par une de ses extrémités articulée à un levier (15) solidaire de l'axe du papillon (25) tandis que l'autre extrémité est solidarisée à la membrane (19) d'un second organe pneumatique (20).3. Automatic choke device according to claim 1, characterized in that the throttle control arrangement (25) of the second body (B) of the carburetor consists of a cam (13) whose angular movement is controlled by a second thermosensitive member of the bimetallic strip type (14) with travel depending on the temperature of the engine, this cam being intended to come into contact with an adjustable stop (18) mounted at the end of a lever (17), the other end is secured to a control rod (16), the latter being by one of its ends articulated to a lever (15) secured to the axis of the butterfly (25) while the other end is secured to the membrane (19) of a second pneumatic member (20). 4. Dispositif de starter automatique selon la revendication 1, caractérisé par le fait que les premier et second organes pneumatiques (9, 20) sont des capsules manométriques dont le compartiment traversé par les tiges de commande (6, 16) est à la pression atmosphérique, tandis que l'autre, renfermant les ressorts de rappel (10, 20) des membranes respectives (8, 19), est relié par un conduit souple au collecteur d'admission, des éléments de réglage ou butées (11, 28) étant montés respectivement sur les capsules (9, 20).4. Automatic choke device according to claim 1, characterized in that the first and second pneumatic members (9, 20) are pressure capsules whose compartment through which the control rods (6, 16) are at atmospheric pressure , while the other, containing the return springs (10, 20) of the respective membranes (8, 19), is connected by a flexible conduit to the intake manifold, adjusting elements or stops (11, 28) being mounted respectively on the capsules (9, 20). 5. Dispositif selon la revendication 4, caractérisé par le fait que des moyens de retardement d'arrivée de la dépression (12) sont montés entre la capsule manométrique et le collecteur d'admission.5. Device according to claim 4, characterized in that means for delaying the arrival of the vacuum (12) are mounted between the pressure capsule and the intake manifold.
EP81401579A 1980-11-07 1981-10-13 Automatic choke device for a two-stage carburettor Expired EP0052026B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8023851 1980-11-07
FR8023851A FR2493921A1 (en) 1980-11-07 1980-11-07 AUTOMATIC STARTER DEVICE FOR DOUBLE BODY CARBURETOR

Publications (2)

Publication Number Publication Date
EP0052026A1 true EP0052026A1 (en) 1982-05-19
EP0052026B1 EP0052026B1 (en) 1986-01-29

Family

ID=9247799

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Application Number Title Priority Date Filing Date
EP81401579A Expired EP0052026B1 (en) 1980-11-07 1981-10-13 Automatic choke device for a two-stage carburettor

Country Status (8)

Country Link
US (1) US4385009A (en)
EP (1) EP0052026B1 (en)
JP (1) JPS57108445A (en)
DE (1) DE3173645D1 (en)
ES (1) ES506922A0 (en)
FR (1) FR2493921A1 (en)
MX (1) MX154725A (en)
PT (1) PT73938B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113268A1 (en) * 1982-12-07 1984-07-11 Regie Nationale Des Usines Renault Automatic choke for carburetors

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US3831567A (en) * 1973-08-16 1974-08-27 Ford Motor Co Supplemental pulldown mechanism for carburetor automatic choke
US3947531A (en) * 1974-12-23 1976-03-30 Ford Motor Company Carburetor with controlled fast idle cam
DE2446403A1 (en) * 1974-09-28 1976-04-08 Daimler Benz Ag Cold start slow running speed stabiliser - has temperature dependant throttle opening stop using bimetal coil spring
US3965223A (en) * 1974-09-18 1976-06-22 Schmelzer Corporation Charge forming device

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FR2248418B2 (en) * 1973-10-19 1980-11-07 Sibe
JPS5154133A (en) * 1974-11-06 1976-05-13 Honda Motor Co Ltd Kikakino chookubenseigyosochi
DE2633546C2 (en) * 1976-05-31 1982-12-16 Société Industrielle de Brevets et d'Etudes S.I.B.E. S.A, 92200 Neuilly-sur-Seine Carburetor for internal combustion engines with auxiliary cold start device
US4053542A (en) * 1976-07-22 1977-10-11 Acf Industries, Inc. Control means for secondary throttle

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Publication number Priority date Publication date Assignee Title
US3831567A (en) * 1973-08-16 1974-08-27 Ford Motor Co Supplemental pulldown mechanism for carburetor automatic choke
US3965223A (en) * 1974-09-18 1976-06-22 Schmelzer Corporation Charge forming device
DE2446403A1 (en) * 1974-09-28 1976-04-08 Daimler Benz Ag Cold start slow running speed stabiliser - has temperature dependant throttle opening stop using bimetal coil spring
US3947531A (en) * 1974-12-23 1976-03-30 Ford Motor Company Carburetor with controlled fast idle cam

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113268A1 (en) * 1982-12-07 1984-07-11 Regie Nationale Des Usines Renault Automatic choke for carburetors

Also Published As

Publication number Publication date
ES8300177A1 (en) 1982-10-01
FR2493921A1 (en) 1982-05-14
MX154725A (en) 1987-12-07
DE3173645D1 (en) 1986-03-13
PT73938A (en) 1981-12-01
FR2493921B1 (en) 1984-04-20
ES506922A0 (en) 1982-10-01
EP0052026B1 (en) 1986-01-29
US4385009A (en) 1983-05-24
PT73938B (en) 1983-04-29
JPS57108445A (en) 1982-07-06

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