EP0003698A1 - Intake system for a carburettor of an internal-combustion engine - Google Patents

Intake system for a carburettor of an internal-combustion engine Download PDF

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Publication number
EP0003698A1
EP0003698A1 EP79400065A EP79400065A EP0003698A1 EP 0003698 A1 EP0003698 A1 EP 0003698A1 EP 79400065 A EP79400065 A EP 79400065A EP 79400065 A EP79400065 A EP 79400065A EP 0003698 A1 EP0003698 A1 EP 0003698A1
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EP
European Patent Office
Prior art keywords
carburetor
auxiliary
throttle
control
intake
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.)
Withdrawn
Application number
EP79400065A
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German (de)
French (fr)
Inventor
Jean-Pierre Pouille
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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Publication date
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0003698A1 publication Critical patent/EP0003698A1/en
Withdrawn legal-status Critical Current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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • 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
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0259—Arrangements; Control features; Details thereof having a dashpot, e.g. working in the throttle opening and closing directions
    • 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
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0272—Two or more throttles disposed in series

Definitions

  • the invention due to the collaboration of Mr. Jean-Pierre POUILLE relates to a carburetor supply device for an internal combustion engine, aiming in particular to improve the carburetion during deceleration and the combustion at partial loads, in any case d '' supply by controllable butterfly carburetor (s) used to regulate the admission of fuel mixture into an intake manifold for several cylinders.
  • s controllable butterfly carburetor
  • the subject of the present invention is a device providing a satisfactory solution to the two aforementioned problems, and which, in a supply for a motor with a throttle carburetor (s) controllable (s) for regulating the admission of fuel mixture into an intake manifold for several cylinders, is essentially characterized in that it comprises an auxiliary throttle placed in the intake of each cylinder, these auxiliary throttles having an overall control subject to the control of the aforementioned carburetor throttle (s), to obey the same sense of maneuver.
  • controllable butterfly valve (s) of the carburetor are subjected to a unidirectional control upon opening. and request closing by own return means, as well as subject, in a manner known per se, to damping members of their return movement in the closed position.
  • such a device also lends itself to an improvement in the carburetion during the controlled acceleration phase, by inserting an elastic link in the control linkage of the throttle valve or throttles and by providing damping means at the opening. of the butterfly (s) so as to delay or make gradual opening with respect to that of the auxiliary butterflies.
  • Such an arrangement makes it possible, in the event of rapid depressing of the accelerator pedal, to avoid a sudden opening of the butterfly valve (s) of the carburetor accompanied by a brutal air intake giving rise, due to the inertia relative to the gasoline and the reduction in the depression in the manifold linked to the opening of the abovementioned butterfly (s), to wetting of the manifold pipes, so that the pump or equivalent recovery device of the carburetor, which must usually be provided to cause additional enrichment to avoid a "hole” in wealth in this case, can fulfill this function by a lower fuel supply.
  • the engine supply device illustrated using FIGS. 1 and 2 comprises a carburetor shown diagrammatically in 1 and connected by an intake manifold 2 to the intake chapels 3 of a cylinder head 4 of engine, the block 5 of which here comprises four cylinders.
  • the throttle valve 7 which is used to regulate the admission of fuel mixture to the engine and which can be actuated remotely by the driver from a pedal 8.
  • This control distance here comprises a lever 9 wedged on the hinge pin of the butterfly and articulated at 10 with a rod 11 articulated at its other end with the pedal 8.
  • this device further comprises, placed in the inlet of each cylinder and here at the outlet of each corresponding branch of the manifold 2, an auxiliary butterfly 12, these butterflies being integral with a hinge pin 13 common to all and on which a control lever 14 is also wedged connected to the rod 11, here by a buttonhole link 15 with a centering finger 16 integral with the rod, so that the auxiliary butterflies 12 obey the same direction of operation as that given to the throttle valve 7 using the pedal 8.
  • the butterflies 7 and 12 are normally biased in their so-called closed position by a return spring 17 acting iti by traction on the control lever 9 throttle valve 7.
  • Said closing position of the throttle valve 7 is the usual position for which it leaves uncovered an air passage section sufficient to ensure that the engine runs at idle speed, the usual idling jet circuit opening out just downstream of the throttle valve 7 having been shown diagrammatically in 18.
  • Said closed position of the auxiliary butterflies 12 is that for which they leave uncovered together a passage section which does not hamper idling, that is to say slightly greater than the sum of that left uncovered by the butterfly 7 and the carburetor idle circuit passage section.
  • FIG. 3 relates to an improved variant previously mentioned, in which the same reference numbers have been kept to the unchanged elements, and the specifics of which alone will be described below.
  • the rod 11a is in one-way support cooperation with the control lever 9a of the throttle valve 7, in the opening direction of the latter, and a single-acting damper, designated by 19 as a whole, is connected to lever 9a to dampen the return movement in the closed position of the throttle valve 7.
  • the damper 19 shown is of the air dash-pot type comprising a cylinder fixed to the carburetor body by a support 20 and a piston connected by a rod 21 to lever 9a, as well as a differential effect valve 22, normally closed by a spring 23, and capable of discovering a large passage of air in the discharge through an orifice 24 which it presents.
  • Such a shock absorber thus opposes little resistance to the opening control of the throttle valve 7 by depressing the pedal 8, but when the latter is released, it slows the return of the throttle valve 7 to the closed position taking place under the only force of the spring 17a.
  • the overall control lever 14a of the auxiliary butterflies 12 is here articulated at 25 with the control rod 11a and both are subjected to a common return spring 26, the effect of which will therefore be to bring back in phase with the relaxation of the pedal 8 the auxiliary butterflies 12 in the closed position, that is to say prior to the delayed closing of the butterfly 7, to further improve the carburetion conditions in this case, as already explained.
  • FIG. 4 relates to a variant aiming at a further improvement of the carburetion in the controlled acceleration phase, and in creating in this case, as already explained, a delayed opening of the throttle valve relative to that of the auxiliary throttles. Again, the same reference numbers have been kept unchanged.
  • a double-acting damper 19a is interposed between the control lever 9a of the throttle valve 7 and the control rod llb actuated by the accelerator pedal a spring plunger 27 while a double-acting damper 19a is provided, not only for damping as in the case of Figure 3 the return movement in the closed position of the butterfly 7, but also to dampen its controlled opening movement.
  • This damper 19a is here of the air dash-pot type, and its double-acting action is made differential, in that it comprises an orifice 24a for the passage of air restricted to the suction, and an additional orifice 28 with valve non-return 29 (flexible menmbrane) opening only to the discharge at the opening of the butterfly 7 is here less than its damping at closing.
  • This variant could also be used for what it provides in its own right in an embodiment such as that of FIG. 1, that is to say then with the addition of a spring plunger such as 27 and a shock absorber to simple effect acting at the opening of the butterfly.
  • the law relating to the opening of the auxiliary butterflies relative to that of the throttle butterfly (s) may be determined experimentally for each type of engine by carrying out comparative tests under partial load as well as in transient operation .
  • shock absorbers can be not only of any type of air but also be of the hydraulic type, and incorporated into the carburetor with as liquid agent the gasoline contained in the latter.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

Carburettor feed device for an internal-combustion engine, comprising a carburettor with a throttle valve or throttle valves (7) controllable for the purpose of adjusting the intake of carburetted mixture into an intake manifold (2) for a plurality of cylinders. This carburettor (1) has an auxiliary throttle valve (12) placed in the intake of each cylinder, these auxiliary throttle valves having an overall control subject to the control of the abovementioned carburettor throttle valve or throttle valves (7) in order to follow the same operating direction. <IMAGE>

Description

L'invention, due à la collaboration de Monsieur Jean-Pierre POUILLE se rapporte à un dispositif d'alimentation à carburateur pour moteur à combustion interne, visant en particulier à améliorer la carburation en décélération et la combustion aux charges partielles, dans tout cas d'alimentation par carburateur à papillon(s) commandable(s) servant à régler l'admission de mélange carburé dans un collecteur d'admission pour plusieurs cylindres.The invention, due to the collaboration of Mr. Jean-Pierre POUILLE relates to a carburetor supply device for an internal combustion engine, aiming in particular to improve the carburetion during deceleration and the combustion at partial loads, in any case d '' supply by controllable butterfly carburetor (s) used to regulate the admission of fuel mixture into an intake manifold for several cylinders.

Un des principaux problèmes de la carburation en décélération est celui de la vaporisation de l'essence liquide contenue dans le collecteur d'admission sous l'effet des fortes dépressions créées par la fermeture plus ou moins complète du ou des papillons du carburateur pendant que le moteur tourne à un régime élevé ou moyen. Ce phénomène crée tout d'abord un enrichissement excessif du mélange qui entre dans les cylindres, puis un assèchement du collecteur d'admission qui risque alors de provoquer un "trou" de richesse lors de la réouverture du ou des papillons, si l'on ne munit pas le carburateur d'un dispositif de "pompe de reprise" approprié.One of the main problems of carburetion under deceleration is that of the vaporization of the liquid gasoline contained in the intake manifold under the effect of the strong depressions created by the more or less complete closure of the butterfly (s) of the carburetor while the engine runs at high or medium speed. This phenomenon firstly creates an excessive enrichment of the mixture which enters the cylinders, then a drying of the intake manifold which then risks causing a richness "hole" during the reopening of the butterfly (s), if one does not provide the carburetor with a suitable "recovery pump" device.

Lors du fonctionnement aux charges partielles, et notamment aux faibles charges, une des principales difficultés pour réaliser une combustion stable réside dans le taux de dilution des gaz frais par les gaz d'échappement. Cette dilution est provoquée par la différence de pression entre celle régnant dans la chapelle d'échappement et celle régnant dans la chapelle d'admission pendant la période dite du "croisement" (c'est-à-dire au voisinage du point mort haut de fin d'échappement), période pendant laquelle les deux soupapes, d'admission et d'échappement, sont ouvertes simultanément.When operating at partial loads, and in particular at low loads, one of the main difficulties in achieving stable combustion lies in the rate of dilution of the fresh gases by the exhaust gases. This dilution is caused by the pressure difference between that prevailing in the exhaust chapel and that prevailing in the intake chapel during the so-called "crossing" period (that is to say in the vicinity of the top dead center of end of exhaust), period during which the two valves, intake and exhaust, are open simultaneously.

Pendant cette période, les gaz d'échappement refluent dans la chambre de combustion (dont le volume est alors faible, puisque le piston est au voisinage du point mort haut) et sont aspirés par la dépression régnant dans la chapelle d'admission. Ce transfert se produit en général jusqu'à ce que la soupape d'échappement soit refermée. Les gaz d'échappement ainsi introduits dans la chapelle et le collecteur d'admission sont ensuite réaspirés pendant le temps d'admission, causant ainsi un taux de dilution élevé et une mauvaise `combustion. Ce phénomène est confirmé par le fait que l'on observe souvent, lorsque la combustion est instable, un cycle brûlant mal suivi aussitôt après d'un cycle brûlant bien. Dans ce cas, à la suite de la mauvaise combustion, les gaz introduits dans la chapelle et le collecteur d'échappement contiennent encore une grande proportion de mélange frais et c'est ce mélange qui "reflue" ensuite vers l'admission, de sorte que le cycle suivant bénéficie ainsi d'un taux de dilution plus faible.During this period, the exhaust gases flow back into the combustion chamber (whose volume is then small, since the piston is in the vicinity of the top dead center) and are sucked in by the vacuum prevailing in the intake chapel. This transfer usually occurs until the exhaust valve is closed. The exhaust gases thus introduced into the chapel and the intake manifold are then re-aspirated during admission time, causing a high dilution rate and poor combustion. This phenomenon is confirmed by the fact that one often observes, when combustion is unstable, a badly burning cycle followed immediately after by a good burning cycle. In this case, as a result of poor combustion, the gases introduced into the chapel and the exhaust manifold still contain a large proportion of fresh mixture and it is this mixture which then "flows back" to the inlet, so that the following cycle thus benefits from a lower dilution rate.

On comprend qu'il est inhérent au principe même du moteur à allumage commandé, dans lequel la commande de couple s'effectue par vannage de l'admission, qu'il y ait aux charges partielles un taux de dilution plus élevé qu'à pleine charge. Mais il est souhaitable, un taux de dilution demeure aux charges partielles aussi constant que possible d'un cycle à l'autre.It is understood that it is inherent in the very principle of the spark-ignition engine, in which the torque control is effected by valve control of the intake, that there is at partial loads a higher dilution rate than at full charge. But it is desirable, a dilution rate remains at partial loads as constant as possible from one cycle to another.

La présente invention a pour objet un dispositif apportant une solution satisfaisante aux deux problèmes précités, et qui, dans une alimentation de moteur à carburateur à papillon(s) commandable(s) pour régler l'admission de mélange carburé dans un collecteur d'admission pour plusieurs cylindres, est essentiellement caractérisé en ce qu'il comporte un papillon auxiliaire placé dans l'admission de chaque cylindre, ces papillons auxiliaires ayant une commande d'ensemble soumise à la commande du ou des papillons de carburateur précités, pour obéir au même sens de manoeuvre.The subject of the present invention is a device providing a satisfactory solution to the two aforementioned problems, and which, in a supply for a motor with a throttle carburetor (s) controllable (s) for regulating the admission of fuel mixture into an intake manifold for several cylinders, is essentially characterized in that it comprises an auxiliary throttle placed in the intake of each cylinder, these auxiliary throttles having an overall control subject to the control of the aforementioned carburetor throttle (s), to obey the same sense of maneuver.

On soustrait ainsi par ces papillons auxiliaires le collecteur aux fortes dépressions qu'il subirait en leur absence en cas de décélération commandée, en même temps que lesdits papillons auxiliaires contribuent à réduire le reflux des gaz d'échappement vers l'admission et à régulariser la carburation dans la zone critique des faibles charges, étant entendu que l'on aura intérêt à les placer à cet effet au plus près des soupapes d'admission du moteur, soit à chaque sortie du collecteur, soit même dans les chapelles d'admission correspondantes de la culasse.These manifolds are thus subtracted from the manifold at the high depressions which it would undergo in their absence in the event of a controlled deceleration, at the same time as said auxiliary throttles contribute to reducing the reflux of the exhaust gases towards the intake and to regulating the carburetion in the critical zone of low loads, it being understood that it will be advantageous to place them for this purpose as close as possible to the engine intake valves, either at each outlet of the manifold, or even in the corresponding intake chapels of the breech.

On notera aussi comme un intérêt important de l'invention, qu'en garantissant un bon fonctionnement aux charges partielles du moteur jusque dans les cas de moteurs ayant une forte période de "croisement", elle peut alors avantageusement s'allier à l'amélioration des performances des moteurs à haut régime pouvant être obtenue ainsi qu'on le sait, par un "croisement" important favorable à un meilleur remplissage des cylindres.It will also be noted as an important advantage of the invention, that by guaranteeing proper operation at partial loads of the engine until in the case of engines having a strong period of "crossing", it can then advantageously be combined with improvement. engine performance at high speed can be obtained as is known, by a significant "crossing" favorable for better filling of the cylinders.

Suivant une disposition préférée, le ou les papillons commandables du carburateur sont soumis à une commande unidirectionnelle à l'ouverture et solliciter à la fermeture par des moyens de rappel propres, ainsi que soumis, de manière connue en soi, à des organes amortisseurs de leur mouvement de retour en position de fermeture.According to a preferred arrangement, the controllable butterfly valve (s) of the carburetor are subjected to a unidirectional control upon opening. and request closing by own return means, as well as subject, in a manner known per se, to damping members of their return movement in the closed position.

En outre, en prévoyant un rappel commun pour ladite commande unidirectionnelle et celle d'ensemble des papillons auxiliaires, ces derniers se refermeront ainsi avant le ou les papillons du carburateur, ce qui est encore plus favorable aux améliorations de carburation déjà exposées.In addition, by providing a common reminder for said one-way control and that of the auxiliary throttle assembly, the latter will thus close before the throttle throttle (s), which is even more favorable to the improvements in carburetion already exposed.

De plus, un tel dispositif se prête également à une amélioration de la carburation en phase d'accélération commandée, en intercalant une liaison élastique dans la tringlerie de commande du ou des papillons de carburateur et en prévoyant des moyens d'amortissement à l'ouverture du ou des papillons de façon à en retarder ou rendre progressive l'ouverture par rapport à celle des papillons auxiliaires. Une telle disposition permet, en cas d'enfoncement rapide de la pédale d'accélérateur, d'éviter une ouverture brutale du ou des papillons du carburateur s'accompagnant d'une arrivée d'air brutale donnant lieu, du fait de l'inertie relative de l'essence et de l'amoindrissement de la dépression dans le collecteur liée à l'ouverture du ou des papillons précités, à un mouillage des tubulures du collecteur, de sorte que la pompe ou dispositif de reprise équivalent du carburateur, qui doit habituellement être prévu pour provoquer un enrichissement supplémentaire en vue d'éviter un "trou" de richesse en ce cas, pourra remplir cette fonction par un moindre apport d'essence.In addition, such a device also lends itself to an improvement in the carburetion during the controlled acceleration phase, by inserting an elastic link in the control linkage of the throttle valve or throttles and by providing damping means at the opening. of the butterfly (s) so as to delay or make gradual opening with respect to that of the auxiliary butterflies. Such an arrangement makes it possible, in the event of rapid depressing of the accelerator pedal, to avoid a sudden opening of the butterfly valve (s) of the carburetor accompanied by a brutal air intake giving rise, due to the inertia relative to the gasoline and the reduction in the depression in the manifold linked to the opening of the abovementioned butterfly (s), to wetting of the manifold pipes, so that the pump or equivalent recovery device of the carburetor, which must usually be provided to cause additional enrichment to avoid a "hole" in wealth in this case, can fulfill this function by a lower fuel supply.

Plusieurs formes de réalisation de dispositifs d'alimentation à carburateur selon l'invention sont ci-après décrites, à titre d'exemples illustratifs de ce qui précède, et en référence au dessin annexé, dans lequel :

  • - la figure 1 est un schéma de principe d'une première forme de réalisation de l'invention ;
  • - la figure 2 est une vue schématique de dessus d'un moteur illustrative d'une implantation des papillons de carburateur et auxiliaires ;
  • - la figure 3 est un schéma de principe d'une seconde forme de réalisation de l'invention ;
  • - la figure 4 est un schéma de principe d'une autre forme de réalisation de l'invention.
Several embodiments of carburetor supply devices according to the invention are described below, by way of illustrative examples of the above, and with reference to the appended drawing, in which:
  • - Figure 1 is a block diagram of a first embodiment of the invention;
  • - Figure 2 is a schematic top view of an illustrative engine of an implantation of the carburetor and auxiliary throttles;
  • - Figure 3 is a block diagram of a second embodiment of the invention;
  • - Figure 4 is a block diagram of another embodiment of the invention.

Le dispositif d'alimentation de moteur illustré à l'aide des figures 1 et 2 comprend un carburateur schématisé en 1 et relié par un collecteur d'admission 2 aux chapelles d'admission 3 d'une culasse 4 de moteur, dont le bloc 5 comprend ici quatre cylindres.The engine supply device illustrated using FIGS. 1 and 2 comprises a carburetor shown diagrammatically in 1 and connected by an intake manifold 2 to the intake chapels 3 of a cylinder head 4 of engine, the block 5 of which here comprises four cylinders.

Du carburateur on a figuré, en aval du diffuseur 6, le papillon des gaz 7 qui sert à régler l'admission de mélange carburé vers le moteur et qui est actionnable à distance par le conducteur à partir d'une pédale 8. Cette commande à distance comprend ici un levier 9 calé sur l'axe d'articulation du papillon et articulé en 10 avec une tringle 11 articulée à son autre extrémité avec la pédale 8.From the carburetor there has been shown, downstream of the diffuser 6, the throttle valve 7 which is used to regulate the admission of fuel mixture to the engine and which can be actuated remotely by the driver from a pedal 8. This control distance here comprises a lever 9 wedged on the hinge pin of the butterfly and articulated at 10 with a rod 11 articulated at its other end with the pedal 8.

Conformément à l'invention, ce dispositif comprend en outre, placé dans l'admission de chaque cylindre et ici a la sortie de chaque branche correspondante du collecteur 2, un papillon auxiliaire 12, ces papillons étant solidaires d'un axe d'articulation 13 commun à tous et sur lequel est calé un levier de commande 14 par ailleurs relié à la tringle 11, ici par une liaison à boutonnière 15 avec un doigt d'entralnement 16 solidaire de la tringle, de sorte que les papillons auxiliaires 12 obéissent au même sens de manoeuvre que celui donné au papillon des gaz 7 à l'aide de la pédale 8. Les papillons 7 et 12 sont normalement sollicités en leur position dite de fermeture par un ressort de rappel 17 agissant iti par traction sur le levier de commande 9 du papillon des gaz 7.According to the invention, this device further comprises, placed in the inlet of each cylinder and here at the outlet of each corresponding branch of the manifold 2, an auxiliary butterfly 12, these butterflies being integral with a hinge pin 13 common to all and on which a control lever 14 is also wedged connected to the rod 11, here by a buttonhole link 15 with a centering finger 16 integral with the rod, so that the auxiliary butterflies 12 obey the same direction of operation as that given to the throttle valve 7 using the pedal 8. The butterflies 7 and 12 are normally biased in their so-called closed position by a return spring 17 acting iti by traction on the control lever 9 throttle valve 7.

Ladite position de fermeture du papillon 7 est celle usuelle pour laquelle il laisse découverte une section de passage d'air suffisante pour assurer la marche du moteur au ralenti, le circuit usuel à gicleur de ralenti débouchant juste en aval du papillon 7 ayant été schématisé en 18.Said closing position of the throttle valve 7 is the usual position for which it leaves uncovered an air passage section sufficient to ensure that the engine runs at idle speed, the usual idling jet circuit opening out just downstream of the throttle valve 7 having been shown diagrammatically in 18.

Ladite position de fermeture des papillons auxiliaires 12 est celle pour laquelle ils laissent ensemble découverte une section de passage n'entravant pas la marche au ralenti, c'est-à-dire un peu supérieure à la somme de celle laissée découverte par le papillon 7 et de la section de passage du circuit de ralenti du carburateur.Said closed position of the auxiliary butterflies 12 is that for which they leave uncovered together a passage section which does not hamper idling, that is to say slightly greater than the sum of that left uncovered by the butterfly 7 and the carburetor idle circuit passage section.

La figure 3 se rapporte à une variante perfectionnée précédemment évoquée, dans laquelle on a conservé aux éléments inchangés les mêmes chiffres de référence, et dont les particularités seules seront ci-après décrites. Dans ce cas, la tringle lla est en coopération unidirectionnelle d'appui avec le levier de commande 9a du papillon 7, dans le sens d'ouverture de celui-ci, et un amortisseur à simple effet, désigné par 19 dans son ensemble, est relié au levier 9a pour amortir le mouvement de retour en position de fermeture du papillon 7. L'amortisseur 19 représenté est du type dash-pot à air comprenant un cylindre fixé sur le corps du carburateur par un support 20 et un piston relié par une biellette 21 au levier 9a, ainsi qu'un clapet à effet différentiel 22, normalement fermé par un ressort 23, et susceptible de découvrir au refoulement un passage d'air important au travers d'un orifice 24 qu'il présente.FIG. 3 relates to an improved variant previously mentioned, in which the same reference numbers have been kept to the unchanged elements, and the specifics of which alone will be described below. In this case, the rod 11a is in one-way support cooperation with the control lever 9a of the throttle valve 7, in the opening direction of the latter, and a single-acting damper, designated by 19 as a whole, is connected to lever 9a to dampen the return movement in the closed position of the throttle valve 7. The damper 19 shown is of the air dash-pot type comprising a cylinder fixed to the carburetor body by a support 20 and a piston connected by a rod 21 to lever 9a, as well as a differential effect valve 22, normally closed by a spring 23, and capable of discovering a large passage of air in the discharge through an orifice 24 which it presents.

Un tel amortisseur n'oppose ainsi qu'une faible résistance à la commande d'ouverture du papillon 7 par enfoncement de la pédale 8, mais au relâchement de cette dernière, il freine le rappel du papillon 7 en position de fermeture s'effectuant sous la seule force du ressort 17a.Such a shock absorber thus opposes little resistance to the opening control of the throttle valve 7 by depressing the pedal 8, but when the latter is released, it slows the return of the throttle valve 7 to the closed position taking place under the only force of the spring 17a.

Le levier de commande d'ensemble 14a des papillons auxiliaires 12 est ici articulé en 25 avec la tringle de commande lla et tous deux sont soumis à un ressort de rappel commun 26, dont l'effet sera donc de ramener en phase avec le relâchement de la pédale 8 les papillons auxiliaires 12 en position de fermeture, c'est-à-dire préalablement à la fermeture retardée du papillon 7, pour améliorer encore les conditions de carburation en ce cas, comme déjà exposé.The overall control lever 14a of the auxiliary butterflies 12 is here articulated at 25 with the control rod 11a and both are subjected to a common return spring 26, the effect of which will therefore be to bring back in phase with the relaxation of the pedal 8 the auxiliary butterflies 12 in the closed position, that is to say prior to the delayed closing of the butterfly 7, to further improve the carburetion conditions in this case, as already explained.

La figure 4 se rapporte à une variante visant une amélioration complémentaire de la carburation en phase d'accélération commandée, et à créer en ce cas, ainsi que déjà exposé, une ouverture retardée du papillon des gaz par rapport à celle des papillons auxiliaires. Là encore, on a conservé aux éléments inchangés les mêmes chiffres de référence.FIG. 4 relates to a variant aiming at a further improvement of the carburetion in the controlled acceleration phase, and in creating in this case, as already explained, a delayed opening of the throttle valve relative to that of the auxiliary throttles. Again, the same reference numbers have been kept unchanged.

Dans cet exemple, il est intercalé entre le levier de commande 9a du papillon 7 et la tringle de commande llb actionnée par la pédale d'accélérateur un poussoir à ressort 27 tandis qu'un amortisseur 19a à double effet est prévu, non seulement pour amortir comme dans le cas de la figure 3 le mouvement de retour en position de fermeture du papillon 7, mais aussi pour amortir son mouvement d'ouverture commandé. Cet amortisseur 19a est ici du type dash-pot à air, et son action à double effet est rendue différentielle, en ce qu'il comporte un orifice 24a de passage d'air restreint à l'aspiration, et un orifice supplémentaire 28 à clapet de non retour 29 (menmbrane souple) s'ouvrant seulement au refoulement à l'ouverture du papillon 7 est ici moindre que son amortissement à la fermeture.In this example, there is interposed between the control lever 9a of the throttle valve 7 and the control rod llb actuated by the accelerator pedal a spring plunger 27 while a double-acting damper 19a is provided, not only for damping as in the case of Figure 3 the return movement in the closed position of the butterfly 7, but also to dampen its controlled opening movement. This damper 19a is here of the air dash-pot type, and its double-acting action is made differential, in that it comprises an orifice 24a for the passage of air restricted to the suction, and an additional orifice 28 with valve non-return 29 (flexible menmbrane) opening only to the discharge at the opening of the butterfly 7 is here less than its damping at closing.

On comprend donc qu'en cas d'enfoncement rapide ou brutal de la pédale d'accélérateur, on obtiendra comme souhaité, une ouverture relativement retardée du papillon 7 par rapport à celle des papillons auxiliaires 12, due au fait que le poussoir à ressort 27 cède temporairement en fonction de la résistance à l'ouverture du papillon 7 assurée par l'amortisseur 19a, étant entendu que le ressort du poussoir 27 est de force prépondérante par rapport à celle du ressort 17a destiné à rappeler le papillon 7 vers sa position de fermeture.It is therefore understood that in the event of rapid or abrupt depressing of the accelerator pedal, one will obtain, as desired, a relatively delayed opening of the butterfly 7 compared to that of the auxiliary butterflies 12, due to the fact that the spring plunger 27 temporarily gives way as a function of the resistance to the opening of the butterfly valve 7 provided by the damper 19a, it being understood that the spring of the pusher 27 is of preponderant force compared to that of the spring 17a intended to return the butterfly valve 7 to its position of closing.

En cas d'enfoncement lent, de la position de la pédale d'accélérateur, le papillon 7 répondra de plus près à l'accroissement d'ouverture commandé, tandis qu'au relâchement de la pédale d'accélérateur, il aura alors comme dans le cas de la figure 3, une fermeture retardée, dépendant du ressort 17a et de l'amortisseur 19a, par rapport au mouvement de rappel conjoint de la pédale 8 et des papillons auxiliaires.In the event of slow depressing, from the position of the accelerator pedal, the throttle valve 7 will respond more closely to the controlled opening increase, while when the accelerator pedal is released, it will then have, as in the case of Figure 3, a delayed closure, dependent on the spring 17a and the damper 19a, relative to the joint return movement of the pedal 8 and the auxiliary butterflies.

Cette variante pourrait aussi être utilisée pour ce qu'elle apporte en propre dans une réalisation telle que celle de la figure 1, c'est-à-dire alors avec adjonction d'un poussoir à ressort tel que 27 et d'un amortisseur à simple effet agissant à l'ouverture du papillon.This variant could also be used for what it provides in its own right in an embodiment such as that of FIG. 1, that is to say then with the addition of a spring plunger such as 27 and a shock absorber to simple effect acting at the opening of the butterfly.

Dans tous les agencements décrits, la loi d'ouverture relative des papillons auxiliaires par rapport à celle du ou des papillons des gaz, pourra être déterminée expérimentalement pour chaque type de moteur en procédant à des essais comparatifs en charge partielle ainsi qu'en fonctionnement transitoire.In all the arrangements described, the law relating to the opening of the auxiliary butterflies relative to that of the throttle butterfly (s) may be determined experimentally for each type of engine by carrying out comparative tests under partial load as well as in transient operation .

Ces agencements sont bien entendu applicables avec tout type de carburateur commun à plusieurs cylindres, et notamment ceux dits à deux corps ou multicorps.These arrangements are of course applicable with any type of carburetor common to several cylinders, and in particular those called two-body or multi-body.

Enfin de nombreuses variantes d'exécution peuvent être envisagées dans le cadre de principe des agencements décrits, sans pour autant sortir du domaine de la présente invention. En particulier, les amortisseurs peuvent être non seulement d'un type quelconque à air mais aussi être de type hydraulique, et incorporés au carburateur avec comme agent liquide l'essence contenue dans ce dernier.Finally, many alternative embodiments can be envisaged within the framework of the arrangements described, without however departing from the scope of the present invention. In particular, the shock absorbers can be not only of any type of air but also be of the hydraulic type, and incorporated into the carburetor with as liquid agent the gasoline contained in the latter.

Claims (4)

1'- Dispositif d'alimentation à carburateur pour moteur à combustion interne, à soupapes, comprenant un carburateur à papillon(s) comman- dable(s) pour régler l'admission de mélange carburé dans un collecteur d'admission pour plusieurs cylindres, caractérisé en ce qu'il comporte un papillon auxiliaire placé dans l'admission de chaque cylindre, ces papillons auxiliaires ayant une commande d'ensemble soumise à la commande du ou des papillons de carburateur précités, pour obéir au même sens de manoeuvre et laisser passage au mélange de ralenti en leur position de fermeture.1'- Fueling device with carburetor for internal combustion engine, with valves, comprising a butterfly carburetor (s) controllable (s) for regulating the admission of fuel mixture in an intake manifold for several cylinders, characterized in that it comprises an auxiliary throttle placed in the intake of each cylinder, these auxiliary throttles having an overall control subject to the control of the aforementioned carburetor throttle (s), to obey the same direction of operation and allow passage to the idle mixture in their closed position. 2*- Dispositif d'alimentation à carburateur selon la revendication 1, caractérisé en ce que le ou les papillons de carburateur sont soumis à une commande unidirectionnelle à l'ouverture et sollicités à la fermeture par des moyens de rappel propres ainsi que soumis à des organes amortisseurs de leur mouvement de retour en position de fermeture.2 * - carburetor supply device according to claim 1, characterized in that the carburetor throttle (s) are subjected to a unidirectional control on opening and requested to close by own return means as well as subjected to damping members of their return movement in the closed position. 3'- Dispositif d'alimentation à carburateur selon la revendication 2, caractérisé en ce que ladite commande unidirectionnelle est à rappel commun avec ladite commande d'ensemble des papillons auxiliaires.3'- carburetor supply device according to claim 2, characterized in that said unidirectional control is common return with said overall control of the auxiliary butterflies. 4'- Dispositif d'alimentation à carburateur selon l'une des revendications précédentes, caractérisé en ce qu'il comporte une liaison élastique intercalée dans la commande du ou des papillons de carburateur et des moyens d'amortissement à l'ouverture du ou de ces derniers, destinés à retarder leur ouverture par rapport à celle des papillons auxiliaires.4'- carburetor supply device according to one of the preceding claims, characterized in that it comprises an elastic connection interposed in the control of the carburetor throttle (s) and damping means at the opening of the or the latter, intended to delay their opening relative to that of the auxiliary butterflies.
EP79400065A 1978-02-07 1979-01-31 Intake system for a carburettor of an internal-combustion engine Withdrawn EP0003698A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7803421A FR2416349A1 (en) 1978-02-07 1978-02-07 CARBURETOR FEEDER FOR INTERNAL COMBUSTION ENGINE
FR7803421 1978-02-07

Publications (1)

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EP0003698A1 true EP0003698A1 (en) 1979-08-22

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EP (1) EP0003698A1 (en)
JP (1) JPS54113727A (en)
FR (1) FR2416349A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002645A1 (en) * 1982-01-29 1983-08-04 Hedelin, Lars, G., B. Internal combustion engine
FR2574121A1 (en) * 1984-11-30 1986-06-06 Renault Variable-progressivity gas control device
GB2184487A (en) * 1985-12-23 1987-06-24 Daimler Benz Ag Accelerator mechanism for a motor vehicle i.c. engine
EP0422502A1 (en) * 1989-10-05 1991-04-17 Nippondenso Co., Ltd. Air intake control system for an internal combustion engine
US5855869A (en) * 1996-12-31 1999-01-05 Rhodia Inc. Microparticulate abrasives

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Publication number Priority date Publication date Assignee Title
FR1599598A (en) * 1968-12-30 1970-07-15
US3859968A (en) * 1971-04-20 1975-01-14 Power Research & Dev Inc Supercharged engines

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Publication number Priority date Publication date Assignee Title
FR1008073A (en) * 1950-01-06 1952-05-13 Solex Improvements to internal combustion engine power systems
US3167059A (en) * 1961-11-21 1965-01-26 Love John Auxiliary valves for internal combustion engines
FR1487102A (en) * 1966-07-20 1967-06-30 Sachsenring Automobilwerke Suction system for internal combustion engine with rotary piston
AT276860B (en) * 1967-01-30 1969-12-10 Hans Heinz Dipl Ing Lippitsch Device on internal combustion engines for reducing harmful exhaust gases
JPS49129018A (en) * 1973-04-23 1974-12-10

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Publication number Priority date Publication date Assignee Title
FR1599598A (en) * 1968-12-30 1970-07-15
US3859968A (en) * 1971-04-20 1975-01-14 Power Research & Dev Inc Supercharged engines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002645A1 (en) * 1982-01-29 1983-08-04 Hedelin, Lars, G., B. Internal combustion engine
FR2574121A1 (en) * 1984-11-30 1986-06-06 Renault Variable-progressivity gas control device
GB2184487A (en) * 1985-12-23 1987-06-24 Daimler Benz Ag Accelerator mechanism for a motor vehicle i.c. engine
FR2592094A1 (en) * 1985-12-23 1987-06-26 Daimler Benz Ag CONTROL APPARATUS FOR AN INTERNAL COMBUSTION ENGINE
EP0422502A1 (en) * 1989-10-05 1991-04-17 Nippondenso Co., Ltd. Air intake control system for an internal combustion engine
US5080065A (en) * 1989-10-05 1992-01-14 Nippondenso Co., Ltd. Air intake control system for an internal combustion engine
US5855869A (en) * 1996-12-31 1999-01-05 Rhodia Inc. Microparticulate abrasives

Also Published As

Publication number Publication date
JPS54113727A (en) 1979-09-05
FR2416349A1 (en) 1979-08-31

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