EP0057022B1 - Device adapted to enrich the mixture supplied by a carburetor for internal combustion engines - Google Patents

Device adapted to enrich the mixture supplied by a carburetor for internal combustion engines Download PDF

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Publication number
EP0057022B1
EP0057022B1 EP82200001A EP82200001A EP0057022B1 EP 0057022 B1 EP0057022 B1 EP 0057022B1 EP 82200001 A EP82200001 A EP 82200001A EP 82200001 A EP82200001 A EP 82200001A EP 0057022 B1 EP0057022 B1 EP 0057022B1
Authority
EP
European Patent Office
Prior art keywords
main
conduit
idling
circuit
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82200001A
Other languages
German (de)
French (fr)
Other versions
EP0057022A2 (en
EP0057022A3 (en
Inventor
Livio Montefameglio
Giovanni Gaviani
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.)
Weber SRL
Original Assignee
Weber SRL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Weber SRL filed Critical Weber SRL
Priority to AT82200001T priority Critical patent/ATE29555T1/en
Publication of EP0057022A2 publication Critical patent/EP0057022A2/en
Publication of EP0057022A3 publication Critical patent/EP0057022A3/en
Application granted granted Critical
Publication of EP0057022B1 publication Critical patent/EP0057022B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
    • F02M7/133—Auxiliary jets, i.e. operating only under certain conditions, e.g. full power
    • 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
    • F02M3/00—Idling devices for carburettors
    • F02M3/08—Other details of idling devices
    • F02M3/09—Valves responsive to engine conditions, e.g. manifold vacuum

Definitions

  • the invention relates to carburettors for internal combustion engines and in particular to a system adapted to supply, under certain conditions of operation of the engine, additional fuel to the conventional main feed and idling circuits of the carburettor.
  • Devices for supplying additional fuel to the aforesaid circuits are known; they mainly consist in additional fuel circuits controlled by a vacuum capsule whose movable partition actuated by the vacuum existing downstream of the throttle valve is capable of opening the connection means between the additional circuits and the main circuit or the idling circuit.
  • Said devices do not supply the two aforesaid circuits simultaneously, but act separately with additional fuel in the first or second circuit; this not only involves the disadvantage of not solving the problems of bulkiness and economy of the used materials, but moreover does not permit to obtain a correct metering of the mixture in all operating conditions of the engine as the separate vacuum members act on the respective circuits, which are separate, in different ways and at different times.
  • Another object of the invention is to provide a circuit controlled by a vacuum member adapted to minimize the times required for feeding the fuel to said main and idling circuits when the load applied to the engine increases rapidly from a low rate of rotation:
  • the invention is incorporated in a carburettor with only one main conduit 1 controlled by the throttle valve 2 actuated by the driver; arranged in the main conduit 1 is a venturi 3 in the interior of which there is a centring member 4 which communicates directly with the emulsioning tube 5.
  • This latter receives the fuel from the constant level float chamber, not shown; the fuel is metered by the main jet 6 and emulsified with air coming in known manner from the calibrated nozzle 7.
  • the circuit 8 for the formation of the mixture supplied during the idling and low performance steps of the engine starts at the bottom of the emulsioning tube 5.
  • the conduit 8 leads to the calibrated orifice 9 to which air is supplied from the calibrated nozzle 10 to form an emulsion which through the conduit 11 is fed into the main conduit 1 through a plurality of holes 12 arranged in the area controlled by the throttle valve 2.
  • Said elements which are known per se constitute the main and idling circuits of the carburettor.
  • the device according to the invention consists of a vacuum capsule 13 which is inwardly divided into two chambers 14 and 15, which do not communicate with each other, by means of an elastic diaphragm 16 reinforced in its central portion by a rigid disk 17 biassed by a spring 18 housed in the chamber 14 and more precisely in a cylindrical projection 19; said spring is adapted to bias the disk 17 towards the right with a predetermined load; secured to the right side of the disk 17 is a pin 20 adapted to shift under the action of the spring 18 the ball 21 from its sealing seat 22 against the action of a spring 23 arranged in the cavity 24 in front of the capsule 13.
  • the chamber 15 of the capsule 13 communicates with the constant level float chamber, not shown, through a first and a second conduit C, and C 2 which respectively permit the flow of the fuel from the float chamber to the chamber 15 and from the latter to the float chamber;
  • the conduit C 2 mainly has the purpose of removing from the chamber 15 any fuel vapour bubbles which may form therein.
  • the chamber 15 When the ball 21 is removed from its seat 22 by the pin 20, the chamber 15 also communicates with the cavity 24 from which departs a conduit 25 which then extends in a vertical plane until it reaches a certain height over the constant level float chamber whereafter it extends horizontally; two branch conduits 26 and 27 depart from the horizontal portion of the conduit 25 and lead into the idling circuit 8 in the area of the calibrated orifice 9 and into the emulsioning tube 5, respectively.
  • the two conduits 26 and 27 are provided with two calibrated orifices indicated by 28 and 29, respectively, whose functions will be explained in greater detail hereinafter.
  • the chamber 14 of the capsule 13 communicates with the conduit 1 through a conduit 30 which transmits to it at any moment the vacuum prevailing downstream of the throttle valve 2.
  • a fuel mixture is obtained whose fuel component is determined by the idling jet 9 and air coming both from the nozzle 10 and the nozzle 7 through the conduits 26 and 27 and the nozzle 28; as a result, the mixture is made lean to an extent limited by the dimensions of the nozzles through which the air flows.
  • the diaphragm 16 and the disk 17 are urged to the right by the spring 18; the pin 20 removes the ball 21 from the seat 22 and the conduit 25 receives fuel from the float chamber along the described path to supply the main and idling circuits.
  • a carburettor with particularly reduced basic dimensioning (of the main and idling circuits) which in itself does not permit to feed the engine with a mixture of the correct strength during high performance and at full power. This makes necessary an additional supply of fuel in these latter steps to ensure correct operation of the engine.
  • the circuit controlled by the vacuum capsule 13 provides the main and idling circuits of the carburettor with an additional fuel supply to meet the feed requirements of the engine for high performance, but excludes this supply when the engine is idling or operating at low or medium performance.
  • An appropriate dimensioning of the spring 18 with respect to the diaphragm 16 permits to open the seat 22 for lower vacuum values, for example of 200 mmHg, i.e. when the throttle valve 2 is sufficiently but not completely open and protects the centering member 4 from the pulsating effects of the engine. Under these conditions the supply of the additional fuel takes place both through the branch 26, which leads to the idling circuit, and the branch 27 which leads to the main circuit, as in both these circuits signals are acting which are sufficiently powerful to attract fuel from the conduit 25.
  • the orifices 28 and 29 By appropriately dimensioning the orifices 28 and 29 it is possible to obtain a prevalence of the amount of fuel fed through the branch 26 over the amount of fuel fed through the branch 27 at least in the beginning of the operation of the circuit controlled by the capsule 13.
  • the vacuum in the manifold diminishes, but the vacuum in the choke 3 increases; consequently, the supply of additional fuel through the conduit 26 diminishes progressively, but the supply of additional fuel through the conduit 27 increases progressively.
  • the throttle valve 2 has reached the completely opened condition, the idling circuit does not supply fuel because the signal of delivery actuation in the area of the holes 12 becomes very low; the additional fuel is only supplied by the branch 27 which feeds the main circuit. In this manner the engine is supplied with a mixture of the correct strength also in the completely open condition when the enrichment becomes particularly important due to the pulsating effect.
  • the device according to the invention permits the engine to be accelerated from a low rate of rotation to reach within the shortest possible time values of rotation and torque permitted by partial, even if large, opening of the throttle valve 2 and this as a result of the short times of response of the circuits controlled by the capsule 13. Said times of response remain low even though the ascending column of the channel 25 contains a considerable hydrostatic head over the level of the float chamber.
  • conduit 27 may lead into the tube 5 at its base through a calibrated orifice, arranged parallel to the main jet 6 and which replaces the calibrated orifice 29.

Description

  • The invention relates to carburettors for internal combustion engines and in particular to a system adapted to supply, under certain conditions of operation of the engine, additional fuel to the conventional main feed and idling circuits of the carburettor.
  • Devices for supplying additional fuel to the aforesaid circuits are known; they mainly consist in additional fuel circuits controlled by a vacuum capsule whose movable partition actuated by the vacuum existing downstream of the throttle valve is capable of opening the connection means between the additional circuits and the main circuit or the idling circuit.
  • Said devices do not supply the two aforesaid circuits simultaneously, but act separately with additional fuel in the first or second circuit; this not only involves the disadvantage of not solving the problems of bulkiness and economy of the used materials, but moreover does not permit to obtain a correct metering of the mixture in all operating conditions of the engine as the separate vacuum members act on the respective circuits, which are separate, in different ways and at different times.
  • In the US-A-2,705,123 an economizer unit for carburettor is described, which is operative to enrich both the main and idling circuits. However, only one calibrated orifice is provided to meter the additional fuel to both such circuits. With such conventional kind of device, it is not possible to meter independently the additional fuel to be fed to the main or to the idling circuit. Further, owing to the arrangement upstream the idling jet where in present engines the leakages mainly occur, no effective increase in the rate of fuel through the idling jet can be achieved with such known device.
  • It is the main object of the present invention to provide a device which in certain operating conditions of the engine increases the amount of fuel supplied simultaneously to the main circuit and the idling circuit to maintain the correct strength of the mixture in said operating conditions.
  • Another object of the invention is to provide a circuit controlled by a vacuum member adapted to minimize the times required for feeding the fuel to said main and idling circuits when the load applied to the engine increases rapidly from a low rate of rotation:
    • The device according to the invention is characterized by what is set forth in the first claim; a further embodiment of the invention is set forth in claim 2. The description referring particularly to the accompanying drawing is given by way of a non-limiting example.
  • In its preferred embodiment the invention is incorporated in a carburettor with only one main conduit 1 controlled by the throttle valve 2 actuated by the driver; arranged in the main conduit 1 is a venturi 3 in the interior of which there is a centring member 4 which communicates directly with the emulsioning tube 5. This latter receives the fuel from the constant level float chamber, not shown; the fuel is metered by the main jet 6 and emulsified with air coming in known manner from the calibrated nozzle 7.
  • The circuit 8 for the formation of the mixture supplied during the idling and low performance steps of the engine starts at the bottom of the emulsioning tube 5. The conduit 8 leads to the calibrated orifice 9 to which air is supplied from the calibrated nozzle 10 to form an emulsion which through the conduit 11 is fed into the main conduit 1 through a plurality of holes 12 arranged in the area controlled by the throttle valve 2. Said elements which are known per se constitute the main and idling circuits of the carburettor.
  • The device according to the invention consists of a vacuum capsule 13 which is inwardly divided into two chambers 14 and 15, which do not communicate with each other, by means of an elastic diaphragm 16 reinforced in its central portion by a rigid disk 17 biassed by a spring 18 housed in the chamber 14 and more precisely in a cylindrical projection 19; said spring is adapted to bias the disk 17 towards the right with a predetermined load; secured to the right side of the disk 17 is a pin 20 adapted to shift under the action of the spring 18 the ball 21 from its sealing seat 22 against the action of a spring 23 arranged in the cavity 24 in front of the capsule 13.
  • The chamber 15 of the capsule 13 communicates with the constant level float chamber, not shown, through a first and a second conduit C, and C2 which respectively permit the flow of the fuel from the float chamber to the chamber 15 and from the latter to the float chamber; the conduit C2 mainly has the purpose of removing from the chamber 15 any fuel vapour bubbles which may form therein.
  • When the ball 21 is removed from its seat 22 by the pin 20, the chamber 15 also communicates with the cavity 24 from which departs a conduit 25 which then extends in a vertical plane until it reaches a certain height over the constant level float chamber whereafter it extends horizontally; two branch conduits 26 and 27 depart from the horizontal portion of the conduit 25 and lead into the idling circuit 8 in the area of the calibrated orifice 9 and into the emulsioning tube 5, respectively. The two conduits 26 and 27 are provided with two calibrated orifices indicated by 28 and 29, respectively, whose functions will be explained in greater detail hereinafter.
  • The chamber 14 of the capsule 13 communicates with the conduit 1 through a conduit 30 which transmits to it at any moment the vacuum prevailing downstream of the throttle valve 2.
  • The operation of the device and particularly of the vacuum capsule 13 is evident from the accompanying drawing.
  • When the vacuum in the conduit 1 downstream of the throttle valve 2 is comparatively high due to little opening of the throttle valve 2, the diaphragm 16 and the disk 17 are withdrawn to the left so that the pin 20 does not urge the ball 21 away from the sealing seat 22. Under these conditions the conduit 25 is not fed with fuel from the float chamber through the conduit Ci, the chamber 15, the sealing seat 22 and the cavity 23 which accommodates the spring 24.
  • When the main circuit does not yet supply fuel, a fuel mixture is obtained whose fuel component is determined by the idling jet 9 and air coming both from the nozzle 10 and the nozzle 7 through the conduits 26 and 27 and the nozzle 28; as a result, the mixture is made lean to an extent limited by the dimensions of the nozzles through which the air flows.
  • When also the main circuit is supplying fuel but the vacuum in the suction manifold is still sufficient to keep the seat 22 closed by the ball 21, the leaning effect persists but is progressively reduced until it eventually disappears.
  • When the same vacuum is comparatively low, the diaphragm 16 and the disk 17 are urged to the right by the spring 18; the pin 20 removes the ball 21 from the seat 22 and the conduit 25 receives fuel from the float chamber along the described path to supply the main and idling circuits.
  • To appreciate the utility of the invention it should be kept in mind that it is necessary to maintain the strength of the mixture at values in conformity with often contradictory but nevertheless important requirements such as fuel saving, the reduction of exhaust pollutants and the performance of a modern engine. In particular, it is necessary to keep the mixture supplied by the carburettor lean during the steps of idling and low and medium performance of the engine, i.e. when the throttle valve of the carburettor is only partially open; it is then necessary to enrich the mixture during the steps of high performance of the engine, i.e. when the throttle valve 2 is nearly or completely open.
  • To meet the criteria of fuel saving and reduction of exhaust pollutants, feeding of the engine in the steps of idling and low and medium performance is ensured by a carburettor with particularly reduced basic dimensioning (of the main and idling circuits) which in itself does not permit to feed the engine with a mixture of the correct strength during high performance and at full power. This makes necessary an additional supply of fuel in these latter steps to ensure correct operation of the engine. The circuit controlled by the vacuum capsule 13 provides the main and idling circuits of the carburettor with an additional fuel supply to meet the feed requirements of the engine for high performance, but excludes this supply when the engine is idling or operating at low or medium performance.
  • An appropriate dimensioning of the spring 18 with respect to the diaphragm 16 permits to open the seat 22 for lower vacuum values, for example of 200 mmHg, i.e. when the throttle valve 2 is sufficiently but not completely open and protects the centering member 4 from the pulsating effects of the engine. Under these conditions the supply of the additional fuel takes place both through the branch 26, which leads to the idling circuit, and the branch 27 which leads to the main circuit, as in both these circuits signals are acting which are sufficiently powerful to attract fuel from the conduit 25.
  • By appropriately dimensioning the orifices 28 and 29 it is possible to obtain a prevalence of the amount of fuel fed through the branch 26 over the amount of fuel fed through the branch 27 at least in the beginning of the operation of the circuit controlled by the capsule 13. As the throttle valve 2 is gradually opened, the vacuum in the manifold diminishes, but the vacuum in the choke 3 increases; consequently, the supply of additional fuel through the conduit 26 diminishes progressively, but the supply of additional fuel through the conduit 27 increases progressively. When the throttle valve 2 has reached the completely opened condition, the idling circuit does not supply fuel because the signal of delivery actuation in the area of the holes 12 becomes very low; the additional fuel is only supplied by the branch 27 which feeds the main circuit. In this manner the engine is supplied with a mixture of the correct strength also in the completely open condition when the enrichment becomes particularly important due to the pulsating effect.
  • The device according to the invention permits the engine to be accelerated from a low rate of rotation to reach within the shortest possible time values of rotation and torque permitted by partial, even if large, opening of the throttle valve 2 and this as a result of the short times of response of the circuits controlled by the capsule 13. Said times of response remain low even though the ascending column of the channel 25 contains a considerable hydrostatic head over the level of the float chamber. This can be explained by-considering that in the open condition of the capsule 13 the conduit 25 receives both the signal coming from the conduit 1 downstream of the throttle valve 2 through the holes 12 and the signal coming from the venturi 3 through the centring member 4 and thus a resulting signal which is at any rate kept high and such as to keep high the speed of the fluid in all the conduits with supercharging circuit insertion times in the order of some hundredths of a second.
  • What has been described is but one of the possible embodiments of the invention in which many changes may be made which do not modify the essence. In particular, the conduit 27 may lead into the tube 5 at its base through a calibrated orifice, arranged parallel to the main jet 6 and which replaces the calibrated orifice 29.

Claims (2)

1. Device adapted to enrich the mixture supplied by a carburettor for internal combustion engines, provided with at least one main circuit (6, 5) for feeding the engine at high performance and full power and with an idling circuit (8, 9, 11) for feeding the engine when it is idling or operated at low or medium performance, said main circuit comprising a vertical main emulsioning tube (5) with a calibrated air nozzle (7) at its top and with a fuel connection to a constant level float chamber and a fuel connection to a main outlet into a venturi (3) in an induction pipe (1) of the carburettor, and said idling circuit (8, 9, 11) starting from the lower region of said main emulsioning tube (5), passing a vertical tube with a calibrated air nozzle (10) at its top and leading to idling delivery holes (12) controlled by a main throttle valve (2); said carburettor being further provided with a capsule (13) responsive to the vacuum prevailing in the induction pipe (1) of the carburettor downstream of the throttle valve (2) and opening and closing a valve (21, 22) in a communication line (C,, C2) between the constant level float chamber and a first conduit (25) arranged in the carburettor downstream of said valve (21, 22), a portion of said conduit (25) being arranged vertically and extending to a certain height beyond the float chamber and being branched off in a second (26) and a third (27) conduit which lead into the idling circuit (8, 9, 11) and the main circuit (6, 5) of the carburettor respectively, characterized in that the fuel connection coming from the float chamber opens into the lower portion of the main emulsioning tube (5) by means of a calibrated main jet, in that the fuel connection of the idling circuit (8, 9, 11) coming from the main emulsioning tube (5) opens into the lower portion of the vertical tube of said idling circuit and in that the second (26) and the third conduits (27) are branched off from the first conduit (25) at said certain height and the second conduit (26) is provided with a first calibrated orifice (28) and opens into the vertical tube of said idling circuit (8,9,11) and the third conduit (27) is provided with a second calibrated orifice (29) and opens into the main emulsioning tube (5).
2. Device according to claim 1, characterized in that the third conduit (27) opens into the lower region of the main emulsioning tube (5).
EP82200001A 1981-01-27 1982-01-04 Device adapted to enrich the mixture supplied by a carburetor for internal combustion engines Expired EP0057022B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82200001T ATE29555T1 (en) 1981-01-27 1982-01-04 DEVICE SUITABLE FOR ENRICHING THE MIXTURE SUPPLIED BY THE CARBURETTOR FOR INTERNAL COMBUSTION ENGINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT331781 1981-01-27
IT03317/81A IT1145013B (en) 1981-01-27 1981-01-27 DEVICE SUITABLE FOR ENRICHING THE MIXTURE DELIVERED BY AN INTERNAL COMBUSTION ENGINE CARBURETOR

Publications (3)

Publication Number Publication Date
EP0057022A2 EP0057022A2 (en) 1982-08-04
EP0057022A3 EP0057022A3 (en) 1983-10-26
EP0057022B1 true EP0057022B1 (en) 1987-09-09

Family

ID=11104861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200001A Expired EP0057022B1 (en) 1981-01-27 1982-01-04 Device adapted to enrich the mixture supplied by a carburetor for internal combustion engines

Country Status (13)

Country Link
EP (1) EP0057022B1 (en)
JP (1) JPS57143151A (en)
AR (1) AR229602A1 (en)
AT (1) ATE29555T1 (en)
BR (1) BR8200281A (en)
DE (1) DE3277218D1 (en)
ES (1) ES508661A0 (en)
IT (1) IT1145013B (en)
PL (1) PL139524B1 (en)
PT (1) PT74308B (en)
RO (1) RO83141B (en)
SU (1) SU1176850A3 (en)
YU (1) YU17582A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538856A1 (en) * 1983-01-03 1984-07-06 Sibe CARBURETOR WITH ELECTROVALVE ENRICHMENT CONTROL

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR931271A (en) * 1946-02-15 1948-02-18 Solex Improvements to carburettors for internal combustion engines
US2705123A (en) * 1949-10-11 1955-03-29 Robert H Hieger Economizer unit for carburetor
JPS411850Y1 (en) * 1964-01-23 1966-02-10
JPS5078721A (en) * 1973-11-20 1975-06-26
JPS51101634A (en) * 1975-03-05 1976-09-08 Nippon Carbureter Kikakino kongohichoseisochi
JPS5420503U (en) * 1977-07-13 1979-02-09
FR2408040A1 (en) * 1977-11-02 1979-06-01 Peugeot Carburettor for IC engine - has mixture enrichment suction pressure control modified by throttle opening

Also Published As

Publication number Publication date
IT8103317A0 (en) 1981-01-27
SU1176850A3 (en) 1985-08-30
DE3277218D1 (en) 1987-10-15
RO83141B (en) 1984-03-30
YU17582A (en) 1988-04-30
RO83141A (en) 1984-03-15
ATE29555T1 (en) 1987-09-15
EP0057022A2 (en) 1982-08-04
BR8200281A (en) 1982-11-23
PL234833A1 (en) 1982-08-16
PL139524B1 (en) 1987-01-31
PT74308B (en) 1983-08-24
AR229602A1 (en) 1983-09-30
PT74308A (en) 1982-02-01
IT1145013B (en) 1986-11-05
ES8300377A1 (en) 1982-11-01
ES508661A0 (en) 1982-11-01
JPS57143151A (en) 1982-09-04
EP0057022A3 (en) 1983-10-26

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