EP0088678B1 - Pneumatische Steuervorrichtung für die Vergaserluftklappe einer Brennkraftmaschine - Google Patents

Pneumatische Steuervorrichtung für die Vergaserluftklappe einer Brennkraftmaschine Download PDF

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Publication number
EP0088678B1
EP0088678B1 EP19830400411 EP83400411A EP0088678B1 EP 0088678 B1 EP0088678 B1 EP 0088678B1 EP 19830400411 EP19830400411 EP 19830400411 EP 83400411 A EP83400411 A EP 83400411A EP 0088678 B1 EP0088678 B1 EP 0088678B1
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EP
European Patent Office
Prior art keywords
capsule
chamber
intake manifold
subjected
depression
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Expired
Application number
EP19830400411
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English (en)
French (fr)
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EP0088678A1 (de
Inventor
Jean-Jacques Schmit
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Regie Nationale des Usines Renault
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Regie Nationale des Usines Renault
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
    • F02M1/14—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on pressure in combustion-air- or fuel-air-mixture intake

Definitions

  • the present invention relates to carburetors for internal combustion engines, of the type in which, during the cold operation of the engine, the tilting of an air flap is controlled as a function of the engine load between a minimum open position corresponding to the full load engine speed and a maximum opening position corresponding to a low load engine speed, and it relates more particularly to a pneumatic device for controlling such an air flap.
  • Document EP-A-0 059 654 (publication date 8.9.82, priority 3.3.81) describes a carburetor of this type in which the control of the air flap is ensured by a vacuum capsule comprising a membrane connected to the flap of air by a linkage and subjected on one side to atmospheric pressure and on the other to the vacuum prevailing at the intake manifold as well as to the thrust of a spring biasing the membrane in the direction which tends to close the air shutter.
  • a cam controlled manually by the "starter” puller includes a movable stop between an active position where, in a first position of the cam corresponding to cold start, it cooperates with the linkage to limit the stroke at the opening of the air shutter and defines a half-open position of the latter, and a retracted position where, in a second position of the cam corresponding to cold operation, it allows the shutter to switch between its minimum open positions and maximum opening.
  • the capsule In the second position of the cam and when the engine is running at idle, vehicle stopped, the capsule, under the influence of vacuum (approximately 600 g / cm 2 ) then prevailing at the intake manifold, pulls the linkage and opens the air shutter.
  • vacuum approximately 600 g / cm 2
  • the vacuum in the intake manifold decreases and, depending on the degree of acceleration, it can reach values between 600 and 0 g / cm 2 .
  • the spring of the capsule pushes the membrane and the return spring of the air flap ensures the closing of the latter.
  • the fuel mixture is then enriched, which makes it possible to obtain the desired acceleration of the vehicle.
  • the shutter To obtain good light acceleration of the vehicle, that is to say with a very low drop in depression, the shutter must begin to close as soon as the decrease in depression is equal to 100 g / cm 2 relative to the depression prevailing in the intake manifold when the engine is idling, vehicle stopped. However, for certain stabilized vehicle speeds, the reduction in vacuum in the intake manifold is greater than 100 g / cm 2 and, consequently, the shutter is not completely open. The fuel mixture introduced into the engine is then richer, and the consumption higher.
  • the present invention aims to eliminate this drawback, which can also be encountered in other carburetors of the aforementioned type. To this end, it relates to a pneumatic control device for the air flap of a carburetor for an internal combustion engine, a carburetor of the type described in document FR-A-2 393 161 and in which, during operation at when the engine is cold, the tilting of the air flap is controlled as a function of the engine load between a minimum opening position corresponding to the engine's full load speed and a maximum opening position corresponding to a low load engine speed.
  • said control device comprising a capsule having two chambers separated by a motor element connected by a linkage to the air flap and subjected to the action of a return spring biasing the motor element in the direction which tends to close the air shutter, one of the chambers being subjected to atmospheric pressure and the other to the vacuum of the intake manifold.
  • said other chamber has an orifice for setting the controlled atmosphere and the control device comprises a second capsule with differential operation which opens the orifice in response to slight variations in the vacuum in the manifold of admission.
  • the second capsule comprises a motor element integral with a rod carrying at its free end a plug controlling the closing of the orifice for setting the controlled atmosphere, and the motor element of the second capsule defines a first chamber subjected directly to the depression of the intake manifold by a conduit and a second chamber subjected to the depression of the intake manifold by another conduit in which is calibrated, a return spring urging the motor element in the direction which tends to close the air vent.
  • Figure 1 schematically illustrates the starting flap mechanism of a carburetor which has been shown in fine lines the outline of the body 1, assumed transparent for clarity of the drawing.
  • the body 1 comprises a venturi 2 in which is mounted a fuel spray device 3.
  • a throttle valve 4 is rotatably mounted about an eccentric axis 5 between a fully closed position delimited by a stop 6 and a fully open position.
  • the rotation of the butterfly 4 is controlled by a lever 7 to which is hooked a spring 8 urging the butterfly 4 to its closed position.
  • An air flap 9 for the cold start is also rotatably mounted around an eccentric axis 10 in the body 1, upstream of the venturi 2. This flap can switch between a completely closed position delimited by a stop 11 and a fully open position.
  • the axis 10 is integral with one end of a lever 12 which controls the movements of the air flap 9 between its open and closed positions.
  • a spring 13 hooked to the lever 12 biases the flap 9 towards its closed position.
  • a cam 25 is articulated around an axis 26 parallel to the axes 5 and 10. The rotational movements of the cam 25 around its axis 26 are controlled by a lever 27 integral with the axis 26 and a rod 28 with manual actuation .
  • a part of the outer contour of the cam 25 constitutes a first cam surface D with which the free end of the lever 7 cooperates to half-open the butterfly valve 4 when the choke is fully pulled.
  • the cam 25 has a hook-shaped appendage 30 whose internal contour constitutes a cam surface F extending another cam surface E.
  • This surface E is defined by a second part of the external contour of the cam 25 and cooperates with the articulation 23 of the lever 12 with the rod 14 to define the minimum open position of the air shutter when the choke is partially pushed back, and keep this shutter fully open when the choke is fully pushed back.
  • the vacuum in the intake manifold is applied to the control device 16 and the articulation 23 is applied against the cam surface F.
  • the flap 9 then takes a half-open position as shown in FIG. 1.
  • the appendix 30, which acts as a stop, is retracted by the rotation of the cam 25, as shown in FIG. 2: in fact, in this position of the cam 25, the lever 12 is free to switch between the fully open position of the shutter of FIG. 2 and a minimum open position defined by the abutment of the joint 23 against the cam surface E.
  • the position of the starting flap 9, and therefore the enrichment of the mixture then depend on the operating conditions of the engine.
  • the vacuum in the intake manifold is high because the opening of the throttle valve is small, and the air flap 9 is fully open.
  • the engine although cold, operates with an unenriched mixture identical to that supplied to it hot.
  • the throttle valve is wide open, the vacuum at the intake manifold decreases rapidly and the spring 13, suitably sized, immediately returns the flap 9 to its position opening imposed by ramp E.
  • FIG. 3 shows the pneumatic control device 16 making it possible to ensure full opening of the air flap 9, even when the vacuum in the intake manifold is low, while ensuring the closing of this flap 9 for a very small variation of this depression at the start of acceleration.
  • This device comprises two pneumatic capsules 101 and 102 rigidly connected to each other by parts 103 and 104.
  • the rod 14 is integral with a membrane 106 of the first capsule 101, of which the left chamber 101 A, relative to the membrane 106, is subjected to atmospheric pressure.
  • the straight chamber 101 B of the capsule 101 comprises a spring 107, having a calibration allowing the displacement of the membrane 106 under a very low vacuum in the intake manifold (not shown). This movement ensures the complete opening of the flap 9, via the rod 14.
  • the chamber 101 B of the capsule 101 where the spring 107 is located is subjected to the vacuum prevailing in the intake manifold by a conduit 108 in which there is a calibration 109 and it includes an orifice 101 C for setting the controlled atmosphere.
  • the sealing of the chamber 101 B with respect to the atmosphere is carried out using a plug 110 closing the orifice 101 C and secured to a rod 111 of the capsule 102.
  • This rod is attached to the membrane 112 of the capsule 102.
  • the capsule 102 comprises two chambers 102 A and 102 B which are separated by the membrane 112.
  • the chamber 102 A is subjected to the vacuum prevailing in the intake manifold via a conduit 113
  • the seal with respect to the atmosphere of the chamber 102 A of the capsule 102 is ensured by a bellows 117 which is tightened on one side on the rod 111, and on the other, on the left shell 105 of the capsule 102.
  • the straight chamber 102 B of the capsule 102 comprises a spring 114, which has a very low calibration so that a low depression of approximately 50 g / cm 2 can move the membrane 112, and consequently the plug 110, to bring the chamber 101 A of the capsule 101 to atmospheric pressure.
  • the right chamber 102 B of the capsule 102 is subjected to the vacuum prevailing at the intake manifold via a conduit 115, in which a calibration 116 is placed.
  • the vacuum in the intake manifold is strong.
  • This vacuum applied via the conduit 108 and the calibration 109 in the right chamber 101 B of the capsule 101 acts on the membrane 106, which compresses the spring 107.
  • the membrane 106 moves the rod 14 and the starting flap 9 is open.
  • the two chambers of the capsule 102 are subjected to the vacuum in the intake manifold, but the establishment of this vacuum in the right-hand part takes place with a delay because of the calibration 116.
  • the depression balance in the two chambers of the capsule 102 is broken: the depression immediately decreases in the left chamber 102 A of the capsule 102, but on the other hand, this reduction in depression in the straight chamber 102 B of the capsule 102 is delayed by the calibration 116.
  • the spring 114 repels the membrane 112 which moves the rod 111 with its plug 110, which closes the orifice of the venting the right chamber 101 B of the capsule 101.
  • a depression is restored in the right chamber 101 B of the capsule 101.
  • This depression attracts the membrane 106 which compresses the spring 107, and the rod 14 opens the shutter 9 in a position which depends on the balance established between this depression, itself a function of the position of the butterfly 4, and of the opposing force of the springs 13 and 107.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Claims (5)

1. Pneumatische Steuervorrichtung für die Vergaserluftklappe einer Brennkraftmaschine, wobei während des Kaltlaufs des Motors das Verdrehen der Luftklappe im Vergaser als Funktion der Motorlast zwischen einer minimalen Offenstellung, die dem Betrieb bei Vollast des Motors entspricht, und einer maximalen Offenstellung, die einem Teillastbetrieb des Motors entspricht, steuerbar ist, mit einer in der Steuervorrichtung (16) enthaltenen Kapsel (101), die zwei Kammern (101 A, 101 B) aufweist, die durch ein Motorteil (106) getrennt sind, der über ein Gestänge mit der Luftklappe verbunden ist und unter der Wirkung einer Rückholfeder (107) steht, die den Motorteil (106) in Richtung des Schließens der Luftklappe beaufschlagt, wobei die erste (101 A) der beiden Kammern von atmosphärischem Druck beaufschlagt wird und die zweite (101 B) mit dem Unterdruck des Einlaßsammlers beaufschlagt wird, dadurch gekennzeichnet, daß die zweite Kammer (101 B) eine Öffnung (101 C) zum gesteuerten Verbinden mit der Atmosphäre aufweist, daß die Steuervorrichtung eine zweite Kapsel (102) mit Ausgleichwirkung aufweist, die die Öffnung (101 C) infolge geringer Unterdruckänderungen im Einlaßsammler freigibt, daß die zweite Kapsel (102) ein Motorteil (112) aufweist, der mit einem Stab (111) verbunden ist, dessen freies Ende einen Stopfen (110) trägt, der das Verschließen der Öffnung (101 C) zum gesteuerten Verbinden mit der Atmosphäre steuert und daß der Motorteil (112) der zweiten Kapsel (102) eine erste Kammer (102 A) begrenzt, auf die der Unterdruck des Einlaßsammlers über eine Leitung (113) direkt einwirkt und eine zweite Kammer (102 B), auf die der Unterdruck des Einlaßsammlers über eine andere Leitung (115) einwirkt, in der eine Engstelle (116) angeordnet ist, während eine Rückholfeder (114) den Motorteil (112) in Richtung des Schließens der Öffnung (101 C) zum gesteuerten Verbinden mit der Atmosphäre beaufschlagt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Stab (111) die erste Kammer (102 A) der zweiten Kapsel (102) dichtend durchsetzt mittels eines Balges (117), der luftdicht am Stab (111) einerseits und an der zweiten Kapsel (102) andererseits befestigt ist.
3. Verfahren nach Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß die erste und die zweite Kapsel (101, 102) starr miteinander verbunden sind.
4. Vorrichtung nach einem der Ansprüche 1, 2 und 3, dadurch gekennzeichnet, daß in an sich bekannter Weise der Motorteil der ersten und zweiten Kapsel (101, 102) eine Membran (106, 112) ist und daß die zugehörige Rückholfeder (107, 114) in der zweiten Kammer (101 B, 102 B) der Kapseln (101, 102) angeordnet ist..
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die zweite Kammer (101 B) der ersten Kapsel (101) von dem Unterdruck des Einlaßsammlers über eine Leitung (108) mit einer Engstelle (109) beaufschlagt ist.
EP19830400411 1982-03-04 1983-03-01 Pneumatische Steuervorrichtung für die Vergaserluftklappe einer Brennkraftmaschine Expired EP0088678B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8203574 1982-03-04
FR8203574A FR2522729A1 (fr) 1982-03-04 1982-03-04 Dispositif de commande pneumatique du volet d'air d'un carburateur pour moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP0088678A1 EP0088678A1 (de) 1983-09-14
EP0088678B1 true EP0088678B1 (de) 1985-11-21

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EP19830400411 Expired EP0088678B1 (de) 1982-03-04 1983-03-01 Pneumatische Steuervorrichtung für die Vergaserluftklappe einer Brennkraftmaschine

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EP (1) EP0088678B1 (de)
DE (1) DE3361260D1 (de)
ES (1) ES8401572A1 (de)
FR (1) FR2522729A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0295398B1 (de) * 1987-06-15 1991-09-18 Firma Andreas Stihl Startautomatik für einen Verbrennungsmotor, insbesondere für den von Hand zu startenden Motor eines Arbeitsgerätes
DE3842974A1 (de) * 1988-12-21 1990-06-28 Stihl Maschf Andreas Membranvergaser mit stellungsabhaengig gekoppelter drosselklappe und chokeklappe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930475A (en) * 1973-08-24 1976-01-06 Ford Motor Company Engine exhaust gas recirculating control
JPS5234512Y2 (de) * 1974-11-30 1977-08-06
FR2393161A1 (fr) * 1977-06-02 1978-12-29 Sibe Perfectionnements aux carburateurs munis d'un volet de depart

Also Published As

Publication number Publication date
ES520266A0 (es) 1983-12-01
ES8401572A1 (es) 1983-12-01
EP0088678A1 (de) 1983-09-14
FR2522729A1 (fr) 1983-09-09
DE3361260D1 (en) 1986-01-02
FR2522729B1 (de) 1984-05-04

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