EP0076178A2 - Method and installation for checking installed carburetors - Google Patents

Method and installation for checking installed carburetors Download PDF

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Publication number
EP0076178A2
EP0076178A2 EP82401520A EP82401520A EP0076178A2 EP 0076178 A2 EP0076178 A2 EP 0076178A2 EP 82401520 A EP82401520 A EP 82401520A EP 82401520 A EP82401520 A EP 82401520A EP 0076178 A2 EP0076178 A2 EP 0076178A2
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EP
European Patent Office
Prior art keywords
carburetor
orifice
downstream
throttle member
throttle
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
EP82401520A
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German (de)
French (fr)
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EP0076178A3 (en
EP0076178B1 (en
Inventor
Jacques Parel
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.)
Solex SA
Original Assignee
Solex SA
Societe Industrielle de Brevets et dEtudes SIBE
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Application filed by Solex SA, Societe Industrielle de Brevets et dEtudes SIBE filed Critical Solex SA
Publication of EP0076178A2 publication Critical patent/EP0076178A2/en
Publication of EP0076178A3 publication Critical patent/EP0076178A3/en
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Publication of EP0076178B1 publication Critical patent/EP0076178B1/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
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • F02M19/01—Apparatus for testing, tuning, or synchronising carburettors, e.g. carburettor glow stands

Definitions

  • the present invention relates to the control of carburetors intended to supply internal combustion engines, of the type comprising an idling circuit opening into the intake duct of the carburetor by an idling orifice placed downstream of the minimum opening position. of the throttle organ and through a progression orifice. It is known that this progression orifice, produced in the form of a slot or of holes staggered along the intake duct, is intended to ensure correct operation of the engine when the driver opens the throttle member, generally constituted by a butterfly, from its minimum open position.
  • the present invention aims to provide a method and a control installation making it possible to detect and evaluate the wear of the moving parts of a carburetor while it is in place on the engine which it supplies and, more generally, to allow an assessment of wear so simple and economical.
  • the invention proposes in particular a control method according to which the engine is operated by maintaining the throttle member of the carburetor in a position where it delimits a determined air passage section for which, when the carburetor is new, the edge of the throttle body straddles the orifice of progression and we compare the value of the vacuum which reigns in the idle circuit of the carburetor with a reference value which is that which reigns, in same operating conditions, on the carburetor in new condition.
  • the comparison will generally be made by measuring the difference between the pressures prevailing, on the one hand, in the idle circuit, on the other hand, in the part located between two calibrated orifices of a channel which connects the atmosphere to a point of the engine intake duct located downstream of the throttle member.
  • Adjustment of the position of the main throttle member for comparison can advantageously be carried out by measuring the vacuum at the neck of a venturi placed in the inlet duct or at the inlet thereof. This depression can be compared to a standard depression, taken from the portion located between two calibrated orifices of a channel connecting the atmosphere downstream of the throttling member.
  • the method is particularly simple to implement because the new carburetors are adjusted in the factory, before assembly, in such a way that the vacuum which prevails in the idling circuit when the carburetor is new is perfectly known and reproducible, this reproducibility n 'not requiring the use of a test bench of the type commonly called "flow bench", the engine itself can be used as a vacuum source and circulation pump.
  • the invention also provides an installation control to implement the invention in a simple manner, the connecting means with the carburetor e can be combined into one hose provided with connecting elements and optionally a venturi flow sensor which is fixed to the carburetor in place of the air filter.
  • the invention proposes, as particular means enabling it to be implemented, the addition to the series carburetors of elements such as adjustable air intake downstream of the throttle member and intake depression also downstream of the throttle, which have no reason to be on a carburetor whose verification is only expected using a traditional test bench.
  • the inverted carburetor shown in section in FIG. 1 comprises a body made up of several assembled parts delimiting an intake duct 1 provided with an air inlet 2.
  • this duct are arranged successively, from upstream to downstream in the direction of air circulation, the outlet of a main spouting system 3, placed at the neck of a venturi 4, and a main throttling member 5 constituted by a butterfly carried by an axis 6 and represented in the open position minimum in Figure 1.
  • the axis 6 crosses the body to allow the throttle control by the driver using a linkage not shown.
  • the minimum opening position of the butterfly valve 5 is adjustable by means of an adjustable stop screw 7 in a part 8 secured to the carburetor body. Return springs, not shown, tend to bring the butterfly back to the minimum open position for which a lever 9 secured to the axis 6 comes to bear against the screw 7.
  • the carburetor idling and advancement circuit includes a channel 10 supplied with air and fuel.
  • the fuel arrives at the channel 10 from a constant level tank (not shown) through a conduit 11.
  • the air comes from a source at atmospheric pressure via a calibrated orifice 12.
  • the idling circuit opens into the intake duct through an idle orifice whose passage section 13 is adjustable using a wealth screw 14 with conical end 15, braked by a spring 16 which retains it in position.
  • the idle channel 10 also communicates with the intake duct 1 through a progression orifice, constituted, in the embodiment described, by a slot 17 placed so as to pass from upstream to downstream of the throttling member 5 when the latter is open from the minimum open position shown in FIG. 1.
  • the progression orifice may as well consist of several holes staggered along the duct, in the vicinity of each other.
  • the carburetor shown is not provided with an air channel for passing air upstream downstream of the throttle member 5, it is provided with means for directly admitting the atmospheric air downstream of the throttle member 5 and to implement a first embodiment of the invention in a convenient manner. These means make it possible to supply the engine with the air necessary for its operation when, during the implementation of the method, the throttle member 5 occupies its extreme minimum opening position, for which the passage cross section that '' it is less than that required to let the air flow pass slow motion.
  • the means shown by way of example in FIG. 1 are constituted by a duct 50, the passage section of which is adjustable using a screw 51. The location where the air inlet takes place downstream of the throttling organ is indifferent.
  • the duct 50 is not necessary when the intake manifold to the engine has a nozzle allowing, if necessary, to create an adjustable air inlet.
  • the carburetor shown in FIG. 1 comprises a hole 73 for taking a vacuum situated downstream from the throttle member 5. During normal operation of the carburetor, this hole 73 is closed by means not shown, such as a threaded pin provided with a seal.
  • the actual control installation can be viewed as comprising a panel 60, a connecting hose 72 and members intended to be fixed to the carburetor to be checked.
  • These latter members include an idle jet 30 provided with a vacuum connection 31, a jet which can moreover be permanently mounted on the carburetor, the vacuum connection being closed for normal operation.
  • the nozzle with vacuum connection shown by way of example in FIG. 3 delimits, with the body 81 of the carburetor, an annular chamber 82 which the idle channel crosses through 10. Holes 83 drilled in the nozzle 30 make the chamber 82 communicate with the rear part of the central bore of the nozzle, constituting the vacuum intake duct 31 inside the idle channel 10. The front part of this bore, separated from the rear part by a ball 79 force fitted the fuel through a throttled passage and delivers it into the channel 10 through holes 80.
  • These bodies include means for measuring the flow drawn in by the motor.
  • these means consist of a shutter plate 40 pierced with a venturi 41 and a conduit 42 for collecting the vacuum which opens at the neck of the venturi.
  • a obturator plate 41 makes it possible to achieve much more precision. high, because the venturi drilled in this plate can be of much more fa-iible dimensions than the normal venturi of the carburetor and the flow rates to be measured are very low, since they correspond to an operation of the engine near idle.
  • the members added to the carburetor also include a vacuum connection connected to the hole 73 already mentioned.
  • Table 60 comprises, in the illustrated embodiment, two differential pressure gauges 61 and 62, the second of which is used for adjusting the flow rate and the first for checking the depression.
  • the pressure gauges shown are of the pneumatic type and with analog reading. They can be replaced by pressure gauges with sensors, for example of the piezoelectric type, with digital display, for example of the seven-segment type.
  • the pressure gauge 61 intended for the measurement of vacuum, has a compartment connected to the vacuum outlet 31 of the idle speed channel 10 by a link 63.
  • the other compartment is connected to the part 64 situated between two calibrated orifices 67 and 65, the first of which is adjustable, a link 66 connecting an atmospheric pressure supply to the vacuum outlet 73 (the adjustment being effected by section adjustment or by replacement).
  • One of the compartments of the pressure gauge 62 is in turn connected to the vacuum sampling duct 42 of the venturi 41, by a connection 68.
  • the other compartment of the pressure gauge 62 is connected to the part 69 comprised between two restrictors 71 and 70, the first of which is adjustable, of a connection between the atmosphere and the vacuum outlet 73.
  • the connections with the vacuum outlet 73 have a common part, downstream of the calibrated orifices 65 and 70 .
  • the parts of links 68, 63 and 66 carried by the panel 60 will generally be constituted by rigid tube, while the connection parts can be, over the major part of their length, grouped in the flexible 72.
  • the first step is to put the wealth screw 14 in a position such that the passage section which it delimits is that adopted when adjusting the new carburetor.
  • the throttle member 5 is brought into its minimum open position by completely loosening the screw 7.
  • the upper edge of the throttle member then comes into a position located downstream of the progression orifice. 17.
  • the depression which prevails in the channel 10 practically does not depend on the wear of the member 5 and its axis 6.
  • the engine is then operated, opening if necessary the screw 51 by an amount just sufficient to supply the air necessary for idling at a determined speed.
  • Port 67 is given the calibration (section S 1 ) previously adopted to adjust the new carburetor.
  • the wealth adjustment screw 14 is then turned to bring the pressure gauge 61 to zero.
  • the vacuum prevailing in the idle circuit has the "standard" value defined for the new carburetor.
  • This result is probably achieved by the fact that, the mixture of air and petrol flowing around the cone 15 of the screw 14 at sonic speed, even for the idling operating vacuum, the value of the vacuum downstream of the throttling organ 5 has no influence on the measurement. Any additional air intake, due for example to the wear of the throttle shaft 6, has no influence on the measurement.
  • the next step consists in opening the throttling member 5, by tightening the screw 7, until the vacuum generated at the neck of the venturi 41 is equal to a standard vacuum, defined by a suitable passage section and predetermined S 2 of the calibrated orifice 71.
  • This depression corresponds to an upstream flow downstream of the throttle member 5 for which, when the carburetor is new, the edge of the throttle member 5 is straddling the transition orifice 17.
  • the screw 51 is closed, the supply of air by the conduit 50 being no longer necessary to allow engine operation.
  • the displacement of the edge of the throttle member 5 until it straddles the transition orifice 17 increases the vacuum in the idle channel 10, since the passage section subjected at the vacuum downstream of the carburetor increases and the corresponding pressure drop decreases.
  • the orifice 67 is then given the calibration (section S 1 ' ⁇ S 1 ) which, when the carburetor was new, revealed, in part 64, a depression equal to that which prevailed in channel 10 on this same carburetor new.
  • the throttle stop screw 5 must be returned to the position giving the engine an idle speed.
  • the calibrated orifice 71 is adjusted to a new predetermined value SI2> S 2 and the throttle valve 5 is adjusted by the screw 7 until the indication of the pressure gauge 62 returns to zero.
  • the air flow passing through the upstream intake duct downstream of the butterfly is then the standardized flow required for this adjustment.
  • the invention is susceptible of numerous practical embodiments.
  • the various calibrated orifices necessary for the calibrations can be preset and mounted on a distributor incorporated in the installation so as to be switchable. This avoids manipulation likely to degrade them.
  • the throttle opening positions can be adjusted before the start of a cold engine, by adjusting the air flow rates by means of particular calibrated orifices 71.
  • the minimum opening position of a starting flap can be adjusted after starting a cold engine.
  • a variant of the method described above overcomes step 1 and the need for a closable air supply (duct 50 and screw 51 in FIG. 1).
  • step 2 On the carburetor to be checked, step 2 is immediately approached, which takes place as follows: the throttle member 5 is kept in a partially open position, using for example the screw 7 and the idle orifice is closed by replacing the richness screw 14 with a shutter. Then the throttle member 5 is closed until the air flow which bypasses it is equal to that for which, on the new carburetor, the edge of the member 5 straddles the orifice for progression.
  • This adjustment is carried out by bringing the pressure gauge indicator 62 to zero, the calibrated orifice 71 in place having the section S 3 .
  • step 3 giving the orifice 67 the calibration (section S 4 ) which reveals, in part 64, a depression equal to that which prevails in the idle channel of a new carburetor: any wear reduces the vacuum in the duct 10, as before, and the imbalance of the pressure gauge makes it possible to assess the degree of wear.
  • the adjustment of the stop screw 7 can be carried out as in step 4 previously described.
  • This simplified variant makes it possible, on condition of providing a shutter to replace the wealth screw 14 provided with an internal channel, which is connected to the pressure gauge 61, to leave the normal idle jet in place instead of replacing it with a nozzle 30 provided with a vacuum outlet.

Abstract

Pour contrôler l'état d'usure du papillon et de son axe dans un carburateur comportant un circuit de ralenti débouchant dans le conduit d'admission par un orifice placé en aval de la position d'ouverture minimale de l'organe d'étranglement et par un orifice de progression, on fait fonctionner le moteur. On maintient le papillon (5) dans une position où il délimite dans le conduit d'admission (1), une section de passage déterminée pour laquelle, lorsque le carburateur est neuf, la tranche du papillon était à cheval sur l'orifice de progression (17). On compare la valeur de la dépression qui règne alors dans le circuit de ralenti (10) du carburateur à une valeur de référence qui est celle qui règne, dans les mêmes conditions de fonctionnement, sur le carburateur à l'état neuf.To check the state of wear of the throttle valve and its axis in a carburetor comprising an idling circuit opening into the intake duct through an orifice placed downstream of the minimum open position of the throttle member and through a progression orifice, the engine is operated. The throttle (5) is maintained in a position where it delimits in the intake duct (1), a determined passage section for which, when the carburetor is new, the edge of the throttle was astride the progression orifice (17). The value of the vacuum which prevails in the idle circuit (10) of the carburetor is compared to a reference value which is that which prevails, under the same operating conditions, on the carburetor in new condition.

Description

La présente invention a pour objet le contrôle des carburateurs destinés à alimenter des moteurs à combustion interne, du type comportant un circuit de ralenti débouchant dans le conduit d'admission du carburateur par un orifice de ralenti placé en aval de la position d'ouverture minimale de l'organe d'étranglement et par un orifice de progression. On sait que cet orifice de progression, réalisé sous forme d'une fente ou de trous échelonnés le long du conduit d'admission, est destiné à assurer un fonctionnement correct du moteur lorsque le conducteur ouvre l'organe d'étranglement, généralement constitué par un papillon, à partir de sa position d'ouverture minimale.The present invention relates to the control of carburetors intended to supply internal combustion engines, of the type comprising an idling circuit opening into the intake duct of the carburetor by an idling orifice placed downstream of the minimum opening position. of the throttle organ and through a progression orifice. It is known that this progression orifice, produced in the form of a slot or of holes staggered along the intake duct, is intended to ensure correct operation of the engine when the driver opens the throttle member, generally constituted by a butterfly, from its minimum open position.

L'usure des parties mobiles du carburateur, essentiellement de l'axe ou du support d'axe du papillon, se traduit par l'apparition d'un jeu qui entraîne un décalage de la tranche du papillon par rapport à l'orifice de progression. Ce décalage entraînant des anomalies de fonctionnement importantes, il est souvent souhaitable de pouvoir le déceler. On peut ainsi déterminer si des défauts de fonctionnement sont dûs à l'usure en question et, dans l'affirmative, procéder aux réparations ou aux remplacements nécessaires.The wear of the moving parts of the carburetor, essentially of the axis or of the throttle shaft support, results in the appearance of a play which causes a shift of the edge of the butterfly relative to the orifice of progression. . This shift causing significant operating anomalies, it is often desirable to be able to detect it. It is thus possible to determine whether malfunctions are due to the wear in question and, if so, to carry out the necessary repairs or replacements.

Malheureusement, il est difficile d'apprécier l'usure de l'axe ou de son support par inspection visuelle, même au cours des opérations d'entretien normal du véhicule qui conduisent au démontage du filtre à air, car les jeux admissibles sont très faibles. Il est donc généralement nécessaire soit de démonter le carburateur pour mesurer directement l'usure avec des appareils de métrologie, soit de se borner à mesurer son effet sur les débits d'air et/ou de combustible à travers le conduit d'admission du carburateur sur un banc d'essais muni de moyens de circulation d'air (FR-A-2 354 552).Unfortunately, it is difficult to assess the wear of the axle or its support by visual inspection, even during normal vehicle maintenance operations which lead to the removal of the air filter, because the allowable clearances are very small . It is therefore generally necessary either to disassemble the carburetor to measure wear directly with metrology devices, or to limit itself to measuring its effect on the air and / or fuel flow rates through the intake duct of the carburetor on a test bench fitted with air circulation means (FR-A-2 354 552).

Ces procédés sont lourds, coûteux et peu satisfaisants. Le démontage du carburateur entraîne une immobilisation du véhicule. Les bancs d'assais nécessaires sont de prix élevé. La simple mesure des débits n'est pas significative.These methods are heavy, expensive and not very satisfactory. Disassembling the carburetor will immobilize the vehicle. The necessary benches are expensive. The simple measurement of flow rates is not significant.

La présente invention vise à fournir un procédé et une installation de contrôle permettant de déceler et d'évaluer l'usure des parties mobiles d'un carburateur alors qu'il est en place sur le moteur qu'il alimente et, plus généralement, de permettre une évaluation de l'usure de façon simple et économique.The present invention aims to provide a method and a control installation making it possible to detect and evaluate the wear of the moving parts of a carburetor while it is in place on the engine which it supplies and, more generally, to allow an assessment of wear so simple and economical.

Dans ce but, l'invention propose notamment un procédé de contrôle suivant lequel on fait fonctionner le moteur en maintenant l'organe d'étranglement du carburateur dans une position où il délimite une section de passaged'air déterminée pour laquelle, lorsque le carburateur est neuf, la tranche de l'organe d'étranglement est à cheval sur l'orifice de progression et on compare la valeur de la dépression qui règne dans le circuit de ralenti du carburateur à une valeur de référence qui est celle qui règne, dans les mêmes conditions de fonctionnement, sur le carburateur à l'état neuf.To this end, the invention proposes in particular a control method according to which the engine is operated by maintaining the throttle member of the carburetor in a position where it delimits a determined air passage section for which, when the carburetor is new, the edge of the throttle body straddles the orifice of progression and we compare the value of the vacuum which reigns in the idle circuit of the carburetor with a reference value which is that which reigns, in same operating conditions, on the carburetor in new condition.

La comparaison sera généralement effectuée en mesurant la différence entre les pressions qui règnent, d'une part, dans le circuit de ralenti, d'autre part, dans la partie située entre deux orifices calibrés d'un canal qui relie l'atmosphère à un point du conduit d'admission du moteur situé en aval de l'organe d'étranglement.The comparison will generally be made by measuring the difference between the pressures prevailing, on the one hand, in the idle circuit, on the other hand, in the part located between two calibrated orifices of a channel which connects the atmosphere to a point of the engine intake duct located downstream of the throttle member.

Le réglage de la position de l'organe d'étranglement principal en vue de la comparaison peut avantageusement être effectué en mesurant la dépression au col d'un venturi placé dans le conduit d'admission ou à l'entrée de celui-ci. Cette dépression peut être comparée à une dépression étalon, prélevée sur la portion située entre deux orifices calibrés d'un canal reliant l'atmosphère à l'aval de l'organe d'étranglement.Adjustment of the position of the main throttle member for comparison can advantageously be carried out by measuring the vacuum at the neck of a venturi placed in the inlet duct or at the inlet thereof. This depression can be compared to a standard depression, taken from the portion located between two calibrated orifices of a channel connecting the atmosphere downstream of the throttling member.

Le procédé est particulièrement simple à mettre en oeuvre du fait que les carburateurs neufs sont réglés en usine, avant montage, de telle façon que la dépression qui règne dans le circuit de ralenti lorsque le carburateur est neuf est parfaitement connue et reproductible, cette reproductibilité n'exigeant pas l'utilisation d'un banc d'essais du type couramment dénommé "flow bench", le moteur lui-même pouvant être utilisé comme source de dépression et pompe de circulation.The method is particularly simple to implement because the new carburetors are adjusted in the factory, before assembly, in such a way that the vacuum which prevails in the idling circuit when the carburetor is new is perfectly known and reproducible, this reproducibility n 'not requiring the use of a test bench of the type commonly called "flow bench", the engine itself can be used as a vacuum source and circulation pump.

L'invention propose également une installation de contrôle permettant de mettre en oeuvre l'invention de façon simple, dont les moyens de liaison avec l'e carburateur peuvent être regroupés en un seul flexible muni d'éléments de connexion et éventuellement d'un venturi de mesure de débit qui est fixé sur le carburateur à la place du filtre à air.The invention also provides an installation control to implement the invention in a simple manner, the connecting means with the carburetor e can be combined into one hose provided with connecting elements and optionally a venturi flow sensor which is fixed to the carburetor in place of the air filter.

Enfin, l'invention propose, à titre de moyens particuliers permettant de la mettre en oeuvre, l'adjonction sur les carburateurs de série d'éléments tels qu'entrée d'air réglable en aval de l'organe d'étranglement et prise de dépression également en aval de l'organe d'étranglement, qui n'ont pas de raison d'être sur un carburateur dont la vérification n'est prévue qu'à l'aide d'un banc d'essais traditionnel.Finally, the invention proposes, as particular means enabling it to be implemented, the addition to the series carburetors of elements such as adjustable air intake downstream of the throttle member and intake depression also downstream of the throttle, which have no reason to be on a carburetor whose verification is only expected using a traditional test bench.

L'invention sera mieux comprise à la lecture de la description qui suit de modes particuliers d'exécution, donnés à titre d'exemples non limitatifs. La description se réfère aux dessins qui l'accompagnent, dans lesquels :

  • - la figure 1 est un schéma de principe montrant les parties d'un carburateur inversé concernées par l'invention et les constituants essentiels d'une installation permettant de mettre en oeuvre le procédé ;
  • - la figure 2 montre un fragment du carburateur de la figure 1, l'organe d'étranglement étant dans une position pour laquelle sa tranche est à cheval sur l'orifice de progression,
  • - la figure 3 montre un gicleur de ralenti à prise de dépression utilisable sur le carburateur de la figure 1.
The invention will be better understood on reading the following description of particular embodiments, given by way of nonlimiting examples. The description refers to the accompanying drawings, in which:
  • - Figure 1 is a block diagram showing the parts of an inverted carburetor concerned by the invention and the essential components of an installation for implementing the method;
  • FIG. 2 shows a fragment of the carburetor of FIG. 1, the throttling member being in a position for which its edge is astride the progression orifice,
  • - Figure 3 shows an idle jet with vacuum connection usable on the carburetor of Figure 1.

Le carburateur inversé montré en coupe sur la figure 1 comprend un corps en plusieurs pièces assemblées délimitant un conduit d'admission 1 muni d'une entrée d'air 2. Dans ce conduit sont disposés successivement, d'amont en aval dans le sens de circulation de l'air, le débouché d'un système de jaillissement principal 3, placé au col d'un venturi 4,et un organe d'étranglement principal 5 constitué par un papillon porté par un axe 6 et représenté en position d'ouverture minimale sur la figure 1. L'axe 6 traverse le corps pour permettre la commande du papillon par le conducteur à l'aide d'une tringlerie non représentée. La position d'ouverture minimale du papillon 5 est réglable au moyen d'une vis de butée 7 ajustable dans une pièce 8 solidaire du corps du carburateur. Des ressorts de rappel non représentés tendent à ramener le papillon vers la position d'ouverture minimale pour laquelle un levier 9 solidaire de l'axe 6 vient en appui contre la vis 7.The inverted carburetor shown in section in FIG. 1 comprises a body made up of several assembled parts delimiting an intake duct 1 provided with an air inlet 2. In this duct are arranged successively, from upstream to downstream in the direction of air circulation, the outlet of a main spouting system 3, placed at the neck of a venturi 4, and a main throttling member 5 constituted by a butterfly carried by an axis 6 and represented in the open position minimum in Figure 1. The axis 6 crosses the body to allow the throttle control by the driver using a linkage not shown. The minimum opening position of the butterfly valve 5 is adjustable by means of an adjustable stop screw 7 in a part 8 secured to the carburetor body. Return springs, not shown, tend to bring the butterfly back to the minimum open position for which a lever 9 secured to the axis 6 comes to bear against the screw 7.

Le circuit de ralenti et de progression du carburateur comprend un canal 10 alimenté en air et en combustible. Le combustible arrive au canal 10 depuis une cuve à niveau constant (non représentée) par un conduit 11. L'air provient d'une source à pression atmosphérique par l'intermédiaire d'un orifice calibré 12. Le circuit de ralenti débouche dans le conduit d'admission par un orifice de ralenti dont la section de passage 13 est réglable à l'aide d'une vis de richesse 14 à extrémité conique 15,freinée par un ressort 16 qui la retient en position.The carburetor idling and advancement circuit includes a channel 10 supplied with air and fuel. The fuel arrives at the channel 10 from a constant level tank (not shown) through a conduit 11. The air comes from a source at atmospheric pressure via a calibrated orifice 12. The idling circuit opens into the intake duct through an idle orifice whose passage section 13 is adjustable using a wealth screw 14 with conical end 15, braked by a spring 16 which retains it in position.

Le canal de ralenti 10 communique également avec le conduit d'admission 1 par un orifice de progression, constitué,dans le mode de réalisation décrit, par une fente 17 placée de façon à passer d'amont en aval de l'organe d'étranglement 5 lorsque celui-ci est ouvert à partir de la position d'ouverture minimale montrée en figure 1. L'orifice de progression peut aussi bien être constitué par plusieurs trous échelonnés le long du conduit, au voisinage les uns des autres.The idle channel 10 also communicates with the intake duct 1 through a progression orifice, constituted, in the embodiment described, by a slot 17 placed so as to pass from upstream to downstream of the throttling member 5 when the latter is open from the minimum open position shown in FIG. 1. The progression orifice may as well consist of several holes staggered along the duct, in the vicinity of each other.

Le carburateur représenté n'étant pas muni d'un canal d'air permettant de faire passer de l'air d'amont en aval de l'organe d'étranglement 5, il est muni de moyens permettant d'admettre directement de l'air atmosphérique en aval de l'organe d'étranglement 5 et de mettre en oeuvre un premier mode d'exécution de l'invention de façon commode. Ces moyens permettent d'amener au moteur l'air nécessaire à son fonctionnement lorsque, au cours de la mise en oeuvre du procédé, l'organe d'étranglement 5 occupe sa position d'ouverture minimale extrême, pour laquelle la section de passage qu'il délimité est inférieure à celle nécessaire pour laisser passer le débit d'air de ralenti. Les moyens représentés à titre d'exemple en figure 1 sont constitués par un conduit 50 dont la section de passage est réglable à l'aide d'une vis 51. L'emplacement où s'effectue l'entrée d'air en aval de l'organe d'étranglement est indifférent. Le conduit 50 n'est pas nécessaire lorsque la tubulure d'admission au moteur comporte un piquage permettant, en cas de besoin, de créer une entrée d'air ajustable.The carburetor shown is not provided with an air channel for passing air upstream downstream of the throttle member 5, it is provided with means for directly admitting the atmospheric air downstream of the throttle member 5 and to implement a first embodiment of the invention in a convenient manner. These means make it possible to supply the engine with the air necessary for its operation when, during the implementation of the method, the throttle member 5 occupies its extreme minimum opening position, for which the passage cross section that '' it is less than that required to let the air flow pass slow motion. The means shown by way of example in FIG. 1 are constituted by a duct 50, the passage section of which is adjustable using a screw 51. The location where the air inlet takes place downstream of the throttling organ is indifferent. The duct 50 is not necessary when the intake manifold to the engine has a nozzle allowing, if necessary, to create an adjustable air inlet.

Toujours pour faciliter la mise en oeuvre de l'invention, le carburateur montré en figure 1 comprend un trou 73 de prise de dépression situé en aval de l'organe d'étranglement 5. Lors du fonctionnement normal du carburateur, ce trou 73 est fermé par des moyens non représentés, tels qu'un pion fileté muni d'un joint d'étanchéité.Still to facilitate the implementation of the invention, the carburetor shown in FIG. 1 comprises a hole 73 for taking a vacuum situated downstream from the throttle member 5. During normal operation of the carburetor, this hole 73 is closed by means not shown, such as a threaded pin provided with a seal.

L'installation de contrôle proprement dite peut être regardée comme comprenant un panneau 60, un flexible de liaison 72 et des organes destinés à être fixés sur le carburateur à vérifier.The actual control installation can be viewed as comprising a panel 60, a connecting hose 72 and members intended to be fixed to the carburetor to be checked.

Ces derniers organes comprennent un gicleur de ralenti 30 muni d'une prise de dépression 31, gicleur qui peut d'ailleurs être monté à demeure sur le carburateur, la prise de dépression étant obturée pour le fonctionnement normal. Le gicleur à prise de dépression montré à titre d'exemple en figure 3 délimite, avec le corps 81 du carburateur, une chambre annulaire 82 que traverse le canal de ralenti 10. Des trous 83 percés dans le gicleur 30 font communiquer la chambre 82 avec la partie arrière de l'alésage central du gicleur, constituant le conduit 31 de prise de dépression à l'intérieur du canal de ralenti 10. La partie avant de cet alésage, séparée de la partie arrière par une bille 79 emmanchée à force, reçoit le combustible par un passage étranglé et le délivre dans le canal 10 par des trous 80.These latter members include an idle jet 30 provided with a vacuum connection 31, a jet which can moreover be permanently mounted on the carburetor, the vacuum connection being closed for normal operation. The nozzle with vacuum connection shown by way of example in FIG. 3 delimits, with the body 81 of the carburetor, an annular chamber 82 which the idle channel crosses through 10. Holes 83 drilled in the nozzle 30 make the chamber 82 communicate with the rear part of the central bore of the nozzle, constituting the vacuum intake duct 31 inside the idle channel 10. The front part of this bore, separated from the rear part by a ball 79 force fitted the fuel through a throttled passage and delivers it into the channel 10 through holes 80.

Ces organes comportent des moyens de mesure du débit aspiré par le moteur. Dans le mode de réalisation montré en figure 1, ces moyens sont constitués par une plaque obturatrice 40 percée d'un venturi 41 et d'un conduit 42 de prélèvement de dépression qui débouche au col du venturi. On pourrait également mesurer le débit par mesure de la dépression au col du venturi dont est normalement muni le carburateur, en prévoyant une prise de dépression 43. Toutefois, l'utilisation d'une plaque obturatrice 41 permet d'arriver à une précision beaucoup plus élevée, car le venturi percé dans cette plaque peut être de dimensions beaucoup plus fa-ibles que le venturi normal du carburateur et les débits à mesurer sont très faibles, puisqu'ils correspondent à un fonctionnement du moteur au voisinage du ralenti.These bodies include means for measuring the flow drawn in by the motor. In the embodiment shown in FIG. 1, these means consist of a shutter plate 40 pierced with a venturi 41 and a conduit 42 for collecting the vacuum which opens at the neck of the venturi. One could also measure the flow rate by measuring the vacuum at the neck of the venturi with which the carburetor is normally provided, by providing a vacuum connection 43. However, the use of a obturator plate 41 makes it possible to achieve much more precision. high, because the venturi drilled in this plate can be of much more fa-iible dimensions than the normal venturi of the carburetor and the flow rates to be measured are very low, since they correspond to an operation of the engine near idle.

Les organes ajoutés au carburateur comprennent encore une prise de dépression reliée au trou 73 déjà mentionné.The members added to the carburetor also include a vacuum connection connected to the hole 73 already mentioned.

Le tableau 60 comporte, dans le mode de réalisation illustré, deux manomètres différentiels 61 et 62 dont le second sert au réglage du débit et le premier à la vérification de la-dépression. Les manomètres représentés sont du type pneumatique et à lecture analogique. Ils peuvent être remplacés par des manomètres à capteurs, par exemple de type piézoélectrique, avec affichage numérique, par exemple du type à sept segments.Table 60 comprises, in the illustrated embodiment, two differential pressure gauges 61 and 62, the second of which is used for adjusting the flow rate and the first for checking the depression. The pressure gauges shown are of the pneumatic type and with analog reading. They can be replaced by pressure gauges with sensors, for example of the piezoelectric type, with digital display, for example of the seven-segment type.

Le manomètre 61, destiné à la mesure de dépression, a un compartiment relié à la prise de dépression 31 du canal de ralenti 10 par une liaison 63. L'autre compartiment est relié à la partie 64 située entre deux orifices calibrés 67 et 65, dont le premier est ajustable, d'une liaison 66 reliant une alimentation à pression atmosphérique à la prise de dépression 73 (l'ajustement s'effectuant par réglage de section ou par remplacement).The pressure gauge 61, intended for the measurement of vacuum, has a compartment connected to the vacuum outlet 31 of the idle speed channel 10 by a link 63. The other compartment is connected to the part 64 situated between two calibrated orifices 67 and 65, the first of which is adjustable, a link 66 connecting an atmospheric pressure supply to the vacuum outlet 73 (the adjustment being effected by section adjustment or by replacement).

L'un des compartiments du manomètre 62 est de son côté relié au conduit de prélèvement de dépression 42 du venturi 41, par une liaison 68. L'autre compartiment du manomètre 62 est relié à la partie 69 comprise entre deux étranglerents 71 et 70, dont le premier est ajustable, d'une liaison entre l'atmosphère et la prise de dépression 73. Dans le mode de réalisation illustré,les liaisons avec la prise de dépression 73 comportent une partie commune,en aval des orifices calibrés 65 et 70.One of the compartments of the pressure gauge 62 is in turn connected to the vacuum sampling duct 42 of the venturi 41, by a connection 68. The other compartment of the pressure gauge 62 is connected to the part 69 comprised between two restrictors 71 and 70, the first of which is adjustable, of a connection between the atmosphere and the vacuum outlet 73. In the illustrated embodiment, the connections with the vacuum outlet 73 have a common part, downstream of the calibrated orifices 65 and 70 .

Les parties des liaisons 68, 63 et 66 portées par le tableau 60 seront généralement constituées en tube rigide, tandis que les parties de raccordement peuvent être, sur la majeure partie de leur longueur, regroupées dans le flexible 72.The parts of links 68, 63 and 66 carried by the panel 60 will generally be constituted by rigid tube, while the connection parts can be, over the major part of their length, grouped in the flexible 72.

Une fois les branchements ainsi effectués, la mise en oeuvre du procédé suivant l'invention se fait en plusieurs étapes successives qui seront maintenant décrites.Once the connections thus made, the implementation of the method according to the invention is done in several successive stages which will now be described.

1. Réglage de la vis de richesse 14 pour délimiter une section de passage calibrée au débouché aval du circuit de ralenti1. Adjustment of the richness screw 14 to delimit a calibrated passage section at the outlet downstream of the idling circuit

La première étape consiste à mettre la vis de richesse 14 dans une position telle que la section de passage qu'elle délimite soit celle adoptée lors du réglage du carburateur neuf.The first step is to put the wealth screw 14 in a position such that the passage section which it delimits is that adopted when adjusting the new carburetor.

Pour cela, on amène l'organe d'étranglement 5 dans sa position d'ouverture minimum en desserrant complètement la vis 7. La tranche supérieure de l'organe d'étranglement vient alors dans une position située en aval de l'orifice de progression 17. Dans cette position du papillon, la dépression qui règne dans le canal 10 ne dépend pratiquement pas de l'usure de l'organe 5 et de son axe 6.For this, the throttle member 5 is brought into its minimum open position by completely loosening the screw 7. The upper edge of the throttle member then comes into a position located downstream of the progression orifice. 17. In this position of the butterfly, the depression which prevails in the channel 10 practically does not depend on the wear of the member 5 and its axis 6.

On fait alors fonctionner le moteur, en ouvrant si nécessaire la vis 51 d'une quantité juste suffisante pour fournir l'air nécessaire au ralenti à vitesse déterminée. On donne à l'orifice 67 le calibrage (section S1) précédemment adopté pour régler le carburateur neuf. On tourne alors la vis de réglage de richesse 14 pour amener le manomètre 61 au zéro.The engine is then operated, opening if necessary the screw 51 by an amount just sufficient to supply the air necessary for idling at a determined speed. Port 67 is given the calibration (section S 1 ) previously adopted to adjust the new carburetor. The wealth adjustment screw 14 is then turned to bring the pressure gauge 61 to zero.

Une fois ce résultat obtenu, la dépression qui règne dans le circuit de ralenti a la valeur "étalon" définie pour le carburateur neuf. On pourrait penser qu'il n'est pas possible d'arriver à ce résultat sans disposer, dans l'installation elle-même, d'une source de vide étalon. En fait, on a constaté que l'on obtient des résultats pleinement satisfaisants en utilisant le moteur comme source de dépression, ce qui se traduit par un avantage considérable du point de vue de la simplicité. Ce résultat est vraisemblablement atteint du fait que, le mélange d'air et d'essence s'écoulant autour du cône 15 de la vis 14 à vitesse sonique, même pour la dépression de fonctionnement au ralenti, la valeur de la dépression en aval de l'organe d'étranglement 5 n'a pas d'influence sur la mesure. Toute entrée d'air supplémentaire, due par exemple à l'usure de l'axe du papillon 6, n'a pas d'influence sur la mesure.Once this result has been obtained, the vacuum prevailing in the idle circuit has the "standard" value defined for the new carburetor. One might think that it is not possible to achieve this result without having, in the installation itself, a source of standard vacuum. In fact, it has been found that fully satisfactory results are obtained using the engine as a source of vacuum, which results in a considerable advantage from the point of view of simplicity. This result is probably achieved by the fact that, the mixture of air and petrol flowing around the cone 15 of the screw 14 at sonic speed, even for the idling operating vacuum, the value of the vacuum downstream of the throttling organ 5 has no influence on the measurement. Any additional air intake, due for example to the wear of the throttle shaft 6, has no influence on the measurement.

2. Réglage du débit d'air à une valeur déterminée, correspondant à une position de la tranche de l'organe d'étranglement 5 à cheval sur l'orifice de progression, sur le carburateur à l'état neuf2. Adjustment of the air flow to a determined value, corresponding to a position of the edge of the throttle member 5 straddling the progression orifice, on the carburetor in new condition

L'étape suivante consiste à ouvrir l'organe d'étranglement 5, par serrage de la vis 7, jusqu'à ce que la dépression engendrée au col du venturi 41 soit égale à une dépression étalon, définie par une section de passage convenable et prédéterminée S2 de l'orifice calibré 71. Cette dépression correspond à un débit d'amont en aval de l'organe d'étranglement 5 pour lequel, lorsque le carburateur est neuf, la tranche de l'organe d'étranglement 5 se trouve à cheval sur l'orifice de transition 17. En même temps que l'on ouvre ainsi l'organe d'étranglement 5, on ferme la vis 51, l'amenée d'air par le conduit 50 n'étant plus nécessaire pour permettre le fonctionnement du moteur.The next step consists in opening the throttling member 5, by tightening the screw 7, until the vacuum generated at the neck of the venturi 41 is equal to a standard vacuum, defined by a suitable passage section and predetermined S 2 of the calibrated orifice 71. This depression corresponds to an upstream flow downstream of the throttle member 5 for which, when the carburetor is new, the edge of the throttle member 5 is straddling the transition orifice 17. At the same time as the throttle member 5 is thus opened, the screw 51 is closed, the supply of air by the conduit 50 being no longer necessary to allow engine operation.

Le réglage convenable est atteint lorsque l'indication du manomètre différentiel 62 est égale à zéro.The appropriate setting is reached when the indication of the differential pressure gauge 62 is equal to zero.

3. Evaluation de l'usure du carburateur au niveau de l'organe d'étranglement 53. Assessment of carburetor wear at the throttle member 5

De façon générale, le déplacement de la tranche de l'organe d'étranglement 5 jusqu'à ce qu'elle soit à cheval sur l'orifice de transition 17 augmente la dépression dans le canal de ralenti 10, puisque la section de passage soumise à la dépression en aval du carburateur augmente et que la perte de charge correspondante diminue.In general, the displacement of the edge of the throttle member 5 until it straddles the transition orifice 17 increases the vacuum in the idle channel 10, since the passage section subjected at the vacuum downstream of the carburetor increases and the corresponding pressure drop decreases.

On donne alors à l'orifice 67 le calibrage (section S1' < S1) qui, lorsque le carburateur était neuf, faisait apparaître, dans la partie 64, une dépression égale à celle qui régnait dans le canal 10 sur ce même carburateur neuf.The orifice 67 is then given the calibration (section S 1 '<S 1 ) which, when the carburetor was new, revealed, in part 64, a depression equal to that which prevailed in channel 10 on this same carburetor new.

Toute usure au niveau du papillon 5 qui entraîne un déplacement de ce papillon vers le bas (papillon en pointillé sur la figure 2) provoque une diminution de la dépression dans le canal de ralenti 10 (puisque la section de passage globale soumise à la dépression du moteur est diminuée). Par conséquent, le manomètre 61 est déséqui- quilibré et donne une indication sur le degré d'usure. On peut ainsi diagnostiquer s'il y a lieu de changer le carburateur ou s'il suffit de le régler de nouveau.Any wear at the level of the butterfly 5 which causes a displacement of this butterfly downwards (butterfly in dotted line in FIG. 2) causes a reduction in the vacuum in the idle channel 10 (since the overall passage section subjected to the vacuum of the engine is reduced). Consequently, the pressure gauge 61 is out of balance. balanced and gives an indication of the degree of wear. It is thus possible to diagnose whether the carburetor needs to be changed or whether it is sufficient to adjust it again.

4 - Réglage de la position de ralenti du papillon4 - Adjusting the throttle idle position

Si le carburateur est jugé bon, il faut ramener la vis de butée du papillon 5 dans la position donnant un ralenti correct au moteur. Pour cela, on ajuste l'orifice calibré 71 à une nouvelle valeur prédéterminée SI2> S2 et on règle, par la vis 7, l'ouverture du papillon 5 jusqu'à ramener l'indication du manomètre 62 à zéro. Le débit d'air passant dans le conduit d'admission d'amont en aval du papillon est alors le débit normalisé requis pour ce réglage.If the carburetor is judged to be good, the throttle stop screw 5 must be returned to the position giving the engine an idle speed. For this, the calibrated orifice 71 is adjusted to a new predetermined value SI2> S 2 and the throttle valve 5 is adjusted by the screw 7 until the indication of the pressure gauge 62 returns to zero. The air flow passing through the upstream intake duct downstream of the butterfly is then the standardized flow required for this adjustment.

L'invention est susceptible de nombreux modes de réalisation pratique. En particulier, les différents orifices calibrés nécessaires pour les étalonnages peuvent être préréglés et montés sur un distributeur incorporé dans l'installation de façon à être commutables. On évite ainsi une manipulation susceptible de les dégrader.The invention is susceptible of numerous practical embodiments. In particular, the various calibrated orifices necessary for the calibrations can be preset and mounted on a distributor incorporated in the installation so as to be switchable. This avoids manipulation likely to degrade them.

On voit que l'ensemble des moyens mis en jeu sont simples et que la méthodologie mise en oeuvre permet d'obtenir des informations sur l'état du carburateur et des réglages d'une grande précision.It can be seen that all of the means involved are simple and that the methodology used makes it possible to obtain information on the condition of the carburetor and very precise adjustments.

Il est par ailleurs possible d'obtenir facilement avec l'installation d'autres réglages particuliers de la position du papillon. Par exemple, on pourra régler les positions d'ouverture du papillon avant départ d'un moteur froid, en ajustant les débits d'air au moyen d'orifices calibrés 71 particuliers. D'une manière analogue, on pourra régler la position d'ouverture minimale d'un volet de départ après lancement d'un moteur froid.It is also possible to obtain easily with the installation of other particular adjustments of the throttle position. For example, the throttle opening positions can be adjusted before the start of a cold engine, by adjusting the air flow rates by means of particular calibrated orifices 71. Similarly, the minimum opening position of a starting flap can be adjusted after starting a cold engine.

Une variante du procédé décrit ci-dessus permet de s'affranchir de l'étape 1 et de la nécessité d'une amenée d'air obturable (conduit 50 et vis 51 sur la figure 1).A variant of the method described above overcomes step 1 and the need for a closable air supply (duct 50 and screw 51 in FIG. 1).

Cette variante implique de déterminer d'abord, sur un carburateur neuf monté sur moteur en marche, la section 53 de l'organe calibré 71 pour laquelle la dépression entre 70 et 71 est égale à celle qui règne au col 41 alors que :

  • - l'orifice de ralenti est obturé,
  • - la tranche de l'organe d'étranglement 5 est à cheval sur l'orifice de transition 17.
This variant involves first determining, on a new carburetor mounted on a running engine, the section 5 3 of the calibrated member 71 for which the vacuum between 70 and 71 is equal to that which prevails at the neck 41 while:
  • - the idle orifice is blocked,
  • the edge of the throttle member 5 straddles the transition orifice 17.

Sur le carburateur à vérifier, on aborde immédiatement l'étape 2, qui se déroule de la façon suivante : on maintient, à l'aide par exemple de la vis 7, l'organe d'étranglement 5 dans une position d'ouverture partielle et on obture l'orifice de ralenti en remplaçant la vis de richesse 14 par un obturateur. On laisse ensuite l'organe d'étranglement 5 se refermer jusqu'à ce que le débit d'air qui le contourne soit égal à celui pour lequel, sur le carburateur neuf, la tranche de l'organe 5 est à cheval sur l'orifice de progression.On the carburetor to be checked, step 2 is immediately approached, which takes place as follows: the throttle member 5 is kept in a partially open position, using for example the screw 7 and the idle orifice is closed by replacing the richness screw 14 with a shutter. Then the throttle member 5 is closed until the air flow which bypasses it is equal to that for which, on the new carburetor, the edge of the member 5 straddles the orifice for progression.

Ce réglage s'effectue en amenant à zéro l'indicateur du manomètre 62, l'orifice calibré 71 en place ayant la section S 3.This adjustment is carried out by bringing the pressure gauge indicator 62 to zero, the calibrated orifice 71 in place having the section S 3 .

On passe ensuite à l'étape 3, en donnant à l'orifice 67 le calibrage (section S4) qui fait apparaître, dans la partie 64, une dépression égale à celle qui règne dans le canal de ralenti d'un carburateur neuf : toute usure diminue la dépression dans le conduit 10, comme précédemment,et le déséquilibre du manomètre permet d'évaluer le degré d'usure.We then go to step 3, giving the orifice 67 the calibration (section S 4 ) which reveals, in part 64, a depression equal to that which prevails in the idle channel of a new carburetor: any wear reduces the vacuum in the duct 10, as before, and the imbalance of the pressure gauge makes it possible to assess the degree of wear.

Si le carburateur est jugé acceptable-, le réglage de la vis de butée 7 peut s'effectuer comme au cours de l'étape 4 précédemment décrite.If the carburetor is deemed acceptable, the adjustment of the stop screw 7 can be carried out as in step 4 previously described.

Cette variante simplifiée permet, à condition de prévoir un obturateur de remplacement de la vis de richesse 14 muni d'un canal interne, qu'on raccorde au manomètre 61, de laisser en place le gicleur normal de ralenti au lieu de le remplacer par un gicleur 30 muni d'une prise de dépression. On peut même prévoir deux canaux, le second permettant de mesurer la dépression dans la tubulure et se substituant à la prise 73.This simplified variant makes it possible, on condition of providing a shutter to replace the wealth screw 14 provided with an internal channel, which is connected to the pressure gauge 61, to leave the normal idle jet in place instead of replacing it with a nozzle 30 provided with a vacuum outlet. We can even provide two channels, the second for measuring the vacuum in the tubing and replacing the socket 73.

On constate enfin et surtout que l'appareillage mis en oeuvre est extrêmement simple et qu'une précision élevée peut néanmoins être atteinte, du fait du caractère différentiel des mesures.Finally and above all, it can be seen that the apparatus used is extremely simple and that high precision can nevertheless be achieved, due to the differential nature of the measurements.

Claims (9)

1. Procédé de contrôle de carburateur, notamment en vue de déterminer l'usure de l'axe de l'organe d'étranglement, comportant un circuit de ralenti débouchant dans le conduit d'admission du carburateur par un orifice de ralenti placé en aval de la position d'ouverture minimale de l'organe d'étranglement et par un orifice de progression (17), caractérisé en ce que : on fait fonctionner le moteur en maintenant l'organe d'étranglement (5) du carburateur dans une position où il délimite une section de passage déterminée pour laquelle, lorsque le carburateur est neuf, la tranche de l'organe d'étranglement est à cheval sur l'orifice de progression (17) et on compare la valeur de la dépression qui règne dans le circuit de ralenti (10) du carburateur à une valeur de référence qui est celle qui règne, dans les mêmes conditions de fonctionnement, sur le carburateur à l'état neuf.1. A method of checking the carburetor, in particular with a view to determining the wear of the axis of the throttle member, comprising an idling circuit opening into the intake duct of the carburetor by an idling orifice placed downstream from the minimum opening position of the throttle member and by a progression orifice (17), characterized in that: the engine is operated by keeping the throttle member (5) of the carburetor in a position where it delimits a determined passage section for which, when the carburetor is new, the edge of the throttling member straddles the advancement orifice (17) and the value of the vacuum prevailing in the idle circuit (10) of the carburetor to a reference value which is that which prevails, under the same operating conditions, on the carburetor in new condition. 2. Procédé suivant la revendication 1, caractérisé en ce que, au cours de ladite comparaison, on mesure la différence entre les pressions qui règnent, d'une part, dans le circuit de ralenti (10), d'autre part, dans la partie (64) située entre deux orifices calibrés (67, 65) d'un canal (66) qui relie l'atmosphère à un point du conduit d'admission du moteur situé en aval de l'organe d'étranglement.2. Method according to claim 1, characterized in that, during said comparison, the difference between the pressures prevailing, on the one hand, in the idle circuit (10), on the other hand, in the part (64) located between two calibrated orifices (67, 65) of a channel (66) which connects the atmosphere to a point in the engine intake duct located downstream of the throttle member. 3. Procédé suivant la revendication 1 ou 2, caractérisé en ce que l'on règle la position de l'organe d'étranglement principal en vue de la comparaison en mesurant la dépression au col d'un venturi (41) placé dans le conduit d'admission ou à l'entrée de celui-ci et en ce qu'on la compare à une dépression étalon, prélevée sur la portion (69) située entre deux orifices calibrés (71, 70) d'un canal reliant l'atmosphère à l'aval de l'organe d'étranglement (5).3. Method according to claim 1 or 2, characterized in that one adjusts the position of the main throttle member for comparison by measuring the vacuum at the neck of a venturi (41) placed in the duct inlet or inlet and in that it is compared to a standard depression, taken from the portion (69) located between two calibrated orifices (71, 70) of a channel connecting the atmosphere downstream of the throttle body (5). 4. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par une étape préalable de réglage d'une section de passage calibré au débouché aval du circuit de ralenti, par amenée de l'organe d'étranglement (5) dans sa position d'ouverture minimale pour laquelle il est entièrement en aval de l'orifice de progression (17) et modification de ladite section (13) alors que le moteur tourne au ralenti jusqu'à ce que la dépression dans le circuit de ralenti (10) prenne la même valeur étalon que pour le carburateur à l'état neuf.4. Method according to any one of the preceding claims, characterized by a prior step of adjusting a calibrated passage section at the outlet downstream of the idle circuit, by bringing the throttle member (5) into its position d minimum opening for which it is entirely downstream of the progression orifice (17) and modification of said section (13) while the engine is idling until the vacuum in the idle circuit (10) takes the same standard value as for the carburetor in new condition. 5. Installation de contrôle pour carburateur comportant un circuit de ralenti débouchant dans le conduit d'admission (1) par un orifice de ralenti placé en aval de l'organe d'étranglement quand celui-ci occupe sa position d'ouverture minimale et par un orifice de progression (17), permettant de mettre en oeuvre le procédé suivant l'une quelconque des revendications 1 à 4, caractérisée en ce qu'elle comprend des moyens (40, 62) de mesure du débit d'air qui passe d'amont en aval de l'organe d'étranglement dans le conduit d'admission, et des moyens (31, 61, 63, 66) de comparaison de la pression qui règne dans le circuit de ralenti avec une valeur de référence.5. Control installation for carburetor comprising an idling circuit opening into the intake duct (1) through an idling orifice placed downstream of the throttle member when the latter occupies its minimum opening position and by a progression orifice (17), making it possible to carry out the method according to any one of claims 1 to 4, characterized in that it comprises means (40, 62) for measuring the air flow rate which passes from 'upstream downstream of the throttle member in the intake duct, and means (31, 61, 63, 66) for comparing the pressure prevailing in the idle circuit with a reference value. 6. Installation suivant la revendication 5, caractérisée en ce que les moyens de comparaison comprennent un conduit (66) reliant l'atmosphère à un point du conduit d'admission situé en aval de l'organe d'étranglement, conduit dont une portion comprise entre deux orifices calibrés (67, 65), dont un peut être réglable, fournit la pression de référence à un manomètre différentiel (61).6. Installation according to claim 5, characterized in that the comparison means comprise a conduit (66) connecting the atmosphere to a point of the intake conduit located downstream of the throttling member, conduit including a portion between two calibrated orifices (67, 65), one of which can be adjustable, supplies the reference pressure to a differential pressure gauge (61). 7. Installation suivant la revendication 6, caractérisée en ce que ledit conduit est relié à l'atmosphère par deux branches, dont l'une comporte ladite partie (64) et dont l'autre comprend une seconde partie, également située entre deux orifices calibrés (70, 71), fournissant une pression de référence à un manomètre différentiel également relié au col d'un venturi (40) de mesure de débit dans le conduit d'admission.7. Installation according to claim 6, characterized in that said duct is connected to the atmosphere by two branches, one of which comprises said part (64) and the other of which comprises a second part, also located between two calibrated orifices (70, 71), providing a reference pressure to a differential pressure gauge also connected to the neck of a venturi (40) for measuring flow in the intake duct. -8. Installation suivant l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comporte des organes destinés à être raccordés au carburateur à contrôler, une partie fixe et un flexible de liaison (72) contenant les liaisons entre la partie fixe et lesdits organes.-8. Installation according to any one of the preceding claims, characterized in that it comprises members intended to be connected to the carburetor to be checked, a fixed part and a connecting hose (72) containing the connections between the fixed part and said members. 9. Installation suivant la revendication 8, caractérisée en ce que lesdits organes comprennent un venturi amovible (40) destiné à être monté de façon étanche sur l'entrée d'air du carburateur en remplacement du filtre à air.9. Installation according to claim 8, characterized in that said members comprise a removable venturi (40) intended to be mounted in leaktight manner on the air inlet of the carburetor replacing the air filter.
EP82401520A 1981-09-30 1982-08-11 Method and installation for checking installed carburetors Expired EP0076178B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8118484 1981-09-30
FR8118484A FR2513698A1 (en) 1981-09-30 1981-09-30 METHOD AND INSTALLATION FOR INSPECTION OF CARBURETORS

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EP0076178A2 true EP0076178A2 (en) 1983-04-06
EP0076178A3 EP0076178A3 (en) 1983-12-07
EP0076178B1 EP0076178B1 (en) 1986-12-10

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EP82401520A Expired EP0076178B1 (en) 1981-09-30 1982-08-11 Method and installation for checking installed carburetors

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US (1) US4483186A (en)
EP (1) EP0076178B1 (en)
JP (1) JPS5870041A (en)
DE (1) DE3274668D1 (en)
ES (1) ES515660A0 (en)
FR (1) FR2513698A1 (en)
PT (1) PT75457B (en)

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CN111677601A (en) * 2020-06-23 2020-09-18 湛江德利车辆部件有限公司 Double-cavity carburetor adjusting device, double-cavity carburetor adjusting equipment and adjusting method thereof

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US4974444A (en) * 1989-07-05 1990-12-04 Ford Motor Company Electronically controlled engine throttle plate adjustment
US5203300A (en) * 1992-10-28 1993-04-20 Ford Motor Company Idle speed control system
US7228729B1 (en) 2006-07-26 2007-06-12 Lincoln Industrial Corporation Apparatus and method for testing fuel flow
US7516670B2 (en) * 2006-10-12 2009-04-14 Schmuck Cory D Multi-channel manometer with independent fluid level adjustments
US7587931B2 (en) * 2008-01-29 2009-09-15 Lincoln Industrial Corporation Apparatus and method for testing fuel flow
RU2484112C2 (en) * 2011-07-28 2013-06-10 Ольга Юрьевна Доротюк Pigment paste

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FR2354552A1 (en) * 1976-06-10 1978-01-06 Deutsche Vergaser Gmbh Co Kg IC engine speed control - operates using variable diaphragm in carburation path which dilates in accordance with desired fuel flow
FR2465992A1 (en) * 1979-09-21 1981-03-27 Sibe Carburettor rotary shaft wear indicator - uses electrical contact assembly to close circuit for warning lamp on dashboard

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FR2354552A1 (en) * 1976-06-10 1978-01-06 Deutsche Vergaser Gmbh Co Kg IC engine speed control - operates using variable diaphragm in carburation path which dilates in accordance with desired fuel flow
FR2465992A1 (en) * 1979-09-21 1981-03-27 Sibe Carburettor rotary shaft wear indicator - uses electrical contact assembly to close circuit for warning lamp on dashboard

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Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111677601A (en) * 2020-06-23 2020-09-18 湛江德利车辆部件有限公司 Double-cavity carburetor adjusting device, double-cavity carburetor adjusting equipment and adjusting method thereof
CN111677601B (en) * 2020-06-23 2022-04-22 湛江德利车辆部件有限公司 Double-cavity carburetor adjusting device, double-cavity carburetor adjusting equipment and adjusting method thereof

Also Published As

Publication number Publication date
JPS5870041A (en) 1983-04-26
EP0076178A3 (en) 1983-12-07
EP0076178B1 (en) 1986-12-10
PT75457A (en) 1982-09-01
US4483186A (en) 1984-11-20
FR2513698A1 (en) 1983-04-01
JPH0341674B2 (en) 1991-06-24
ES8305466A1 (en) 1983-05-01
ES515660A0 (en) 1983-05-01
FR2513698B1 (en) 1984-01-13
PT75457B (en) 1984-10-23
DE3274668D1 (en) 1987-01-22

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