US3810606A - Carburetor output control device - Google Patents

Carburetor output control device Download PDF

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Publication number
US3810606A
US3810606A US00326993A US32699373A US3810606A US 3810606 A US3810606 A US 3810606A US 00326993 A US00326993 A US 00326993A US 32699373 A US32699373 A US 32699373A US 3810606 A US3810606 A US 3810606A
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US
United States
Prior art keywords
control chamber
air
atmosphere
valve
induction passage
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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 - Lifetime
Application number
US00326993A
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English (en)
Inventor
K Masaki
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.)
Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
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Publication of US3810606A publication Critical patent/US3810606A/en
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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
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/23—Fuel aerating devices
    • F02M7/24—Controlling flow of aerating air
    • F02M7/28—Controlling flow of aerating air dependent on temperature or pressure
    • 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
    • F02M23/00—Apparatus for adding secondary air to fuel-air mixture
    • F02M23/04—Apparatus for adding secondary air to fuel-air mixture with automatic control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • ABSTRACT A device for optimizing the air/fuel ratio of a combustible mixture produced in a carburetter when atmospheric pressure and temperature deviate from given levels.
  • Atomospheric air is supplied downstream of a carburetter throttle valve through a diaphragm valve assembly responsive to the extension of the bellows during idling or light-load operation of an engine, while air is supplied to a main mixture supply passage through another diaphragm valve assembly responsive to the operation of the firstmentioned assembly during full-load operation.
  • This invention relates, in general, to a carburetter for use with an automotive internal combustion engine and more particularly to a device connected to the carburetter for optimizing the air/fuel ratio of a combustible mixture in accordance with climatic conditions such as atmospheric pressure and temperature.
  • the unburned contents may be deposited onto parts of the cleaning device. Whilst such deposition alone will adversely affect the performance of the device, an untimely and incomplete burning of the deposited unburned contents may happen, thus almost entirely eliminating the effects of such cleaning device.
  • a primary object of the present invention is therefore to provide a new and improved device which can obviate the drawbacks accompanied by conventional carburetters as mentioned.
  • Another object is to provide a device for correcting and optimizing the air/fuel ratio of a combustible mixture for the climatic condition in which the carburetter is used at any one time.
  • Still another object is to supply an unnecessarily enriched combustible mixture with fresh air when the atmospheric temperature is high and the atmospheric pressure is low.
  • a further object is to provide optimization of the air/fuel ratio of the mixture under all driving conditions of a vehicle including idling and acceleration.
  • a still further object is to raise the engine operational performance particularly when a vehicle is running at a high altitude.
  • FIGURE is a schematic sectional view of a carburetter equipped with a device according to the present invention.
  • a carburetter generally designated by numeral is, as usual, constituted by an induction passage 11 leading to an intake manifold (not shown), a throttle valve 12 located intermediate the induction passage 11, a float chamber 13 with a float 14, a main mixture circuit l5 and an idling and slow-running mixture circuit 16, the former being connected between the float chamber 13 and the induction passage 11 and the latter branching off from the circuit 15.
  • the induction passage 11 is formed with a venturi or choke tube 17 upstream of the throttle valve 12.
  • the main mixture circuit 15 comprises a main fuel jet 18 adjacent the float chamber 13, a main air/fuel mixer 19 which encloses therein an air bleed tube 20, and a main nozzle 21 opening into the venturi portion 17 of the induction passage.
  • the idle and slow running mixture circuit 16 is branched off from the main mixture circuit 15 posterior to the main jet 18 and leads to a slow running port 22 and further to an idling port 23, the former of which opens into the induction passage 11 adjacent the periphery of the closed throttle valve, and the latter downstream of the throttle valve.
  • the effective area of this idling port 23 is preferably adjustable by a needle valve 24.
  • the idling and slow-running mixture circuit 16 further comprises a plurality of air bleed restrictors as indicated at 24 and 25.
  • the device 30 substantially consists of a combined bellows and diaphragm valve assembly 31 and another diaphragm valve assembly 32.
  • the valve assemblies are disposed axially and spacedly opposite to each other forming a control chamber 33 between a valve seat 46 of the valve assembly 31 and a diaphragm 49 of the valve assembly 32.
  • a housing 34 forms a chamber accommodating the first assembly 31 and divided by a diaphragm 35 into an upper chamber 36 and a lower chamber 37.
  • the upper chamber 36 accommodates therein a bellows 38 which is filled with an inert gas such as nitrogen.
  • the top of the bellows 38 is connected to a pressure regulator valve 39 which is, in turn, mounted on the upper wall of the housing 34 for maintaining the pressure in the inert gas at a constant level.
  • the bottom of the bellows 38 is supported on and secured to the diaphragm 35.
  • a plurality of air vents 40 are formed, through which atmospheric air circulates around the bellows and influences the inert gas filling the bellows 38.
  • the bellows thus sensing a change in temperature and pressure, will extend and when they reach given levels the bellows will move the diaphragm 35.
  • the assembly 31 further includes a stem 41 secured to and extending I from the diaphragm 35 through the lower chamber 37.
  • the diaphragm 35 is biased upwardly in the drawing by a spiral spring 42 mounted in the lower chamber 37.
  • the lower chamber 37 is connected through a conduit 43 to an air cleaner (not shown) of the engine.
  • a tubular small housing 44 defining the control chamber 33 extends toward the opposite side of the' housing 34 or downwardly in the drawing.
  • An annular valve seat 46 is provided on the inner circumferential w'allof the tubular housing to form the valve 45 which separates the control chamber 33 from the space continuing to the lower chamber 37.
  • the valve stem 41 has at its leading end a valve head 47 which is tapered upwardly in the I drawing.
  • the valve 45 controls the flow therethrough by the tapered valve head 47 in accordance with the degree of displacement of the diaphragm 35.
  • air is fed through the air cleaner into the chamber 33 through the lower chamber 37 in varying amounts which depend on the changes in the open area of the valve 45.
  • a housing 48 accommodating the other diaphragm valve assembly 32 is similarly formed as, but smaller in diameter than the housing 34, and made integral with the tubular housing 44.
  • the inner space of this housing 48 is also divided by a diaphragm 49 into an upper chamber 50 continuing to the control chamber 33 and another control chamber 51.
  • a spiral spring 52 is mounted in the upper chamber 50 for slightly biasing the diaphragm 49 downwardly.
  • a valve stem 53 extends from the diaphragm 49 and has an upwardly tapered valve head 54 at its leading end.
  • the control chamber 51 is communicable with air through a valve 55 formed by an annular valve seat 56 and the valve head 54.
  • the control chambers 33 and 51 respectively communicate with the induction passage 11 downstream of the throttle valve 12 through a conduit 60 and with the main air/fuel mixer 19 through a conduit 61.
  • air present in these chambers is admitted into conduits 60 and 61 in dependence on various driving conditions, as will be hereinafter discussed.
  • the conduits 60 and 61 are respectively provided with restrictors 62 and 63 for throttling purposes.
  • valve 45 is kept closed by the valve head 47 of the stem 41 under normal temperature and pressure, the carburetter then functioning as usual. Neither does the assembly 32 operate, since depression in the induction passage 11 is transmitted to the control chamber 33.
  • the gas filling the bellows 38 tends to expand, thus extending the bellows toward the lower chamber 37.
  • the diaphragm 35 is then moved downward to open the valve 45.
  • air flowing through, the conduit 43 is allowed into the control chamber 33 through the lower chamber37 and the valve 45.
  • the throttle valve takes an idlingposition indicated at a solid line in the drawing or a slightly more opened position, a pressure difference is established between the induction passage downstream of the throttle valve and the control chamber 33 which is supplied with air in the above described manner. Air in the control chamber 33 is therefore sucked into the induction passage downstream of the throttle valve through the conduit 60.
  • the diaphragm 49 of the second assembly 32 18 also moved downward mostly by the pressure in the chamber 33 and partly by the biasing force of the spring 52.
  • valve 55 is open to allow air therethrough into the control chamber 51.
  • the opening degree of the valve 55 increases and the correspondingly increasing amount of air feeds the chamber 51.
  • the suction established in the venturi portion 17 now starts to draw air present in the chamber 51 through the conduit 61 into the lower portion of the main mixer 19. Since only a small amount of air feeding the main mixer is sufficient for the purpose of weakening the mixture, the conduit 61 leading to the main mixer 19 may be of small diameter.
  • the quantities of air flowing through the conduits and 61 are respectively controlled by the restrictors 62 and 63.
  • the present invention provides an optimum mixture strength under any climatic condition. It should be also appreciated that the device of the present invention operates independently for idling or light-load operation and for full load operation.
  • the device of the present invention e.g., such that the engine speed at idling decreases and finally the engine tends to stall when atmospheric pressure is low at high altitudes.
  • This effect is again caused by the enrichment effect of the mixture, which can be weakened through supplying the induction passage downstream of the throttle valve with air in the manner described.
  • a carburetter for an internal combustion engine including an induction passage, a throttle valve dividing said induction passage into an upstream part and a downstream part, and a main mixture supply passage opening into said upstream part of the induction passage,
  • a carburetter control device comprising:
  • a first control chamber communicating with the downstream part of the induction passage and being communicable with the atmosphere
  • a second control chamber communicating with said main mixture supply passage and communicable with atmosphere
  • air pressure responsive means operable in response to an air pressure prevailing in said first control chamber, for providing communication between said second control chamber and the atmosphere to introduce additional air into said main mixture supply passage in an amount varying in degrees.
  • a device further comprising a first air supply conduit connected between said first control chamber and said downstream part of the induction passage.
  • a device wherein said first air supply conduit includes a flow restrictor.
  • a device further comprising a second air supply conduit connected between said second control chamber and said main mixture supply passage.
  • said second air supply conduit includes a flow restrictor.
  • said firstmentioned means comprises a bellows filled with an inert gas to extend in response to said at least one ofthe atmospheric pressure and temperature, a diaphragm member secured to said bellows and movable therewith, and a valve member connected to said diaphragm member and movable therewith, said valve member having a tapered valve head to vary the degree of communication between said first control chamber and the atmosphere.
  • said firstmentioned means further comprises a spring for biasing said diaphragm member to cause said valve member to interrupt communication between said first control chamber and the atmosphere.
  • said air pressure responsive means comprises a diaphragm member yieldably disposed between said first and second control chambers and a valve member connected to said diaphragm member and movable therewith, said valve member having a tapered valve head to vary the degree of communication between said second control chamber and the atmosphere.
  • said air pressure responsive means further comprises a spring disposed in said first control chamber for biasing said diaphragm member in a direction to cause said valve member to establish communication between said second control chamber and the atmosphere.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US00326993A 1972-02-01 1973-01-26 Carburetor output control device Expired - Lifetime US3810606A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47011972A JPS5032907B2 (de) 1972-02-01 1972-02-01

Publications (1)

Publication Number Publication Date
US3810606A true US3810606A (en) 1974-05-14

Family

ID=11792510

Family Applications (1)

Application Number Title Priority Date Filing Date
US00326993A Expired - Lifetime US3810606A (en) 1972-02-01 1973-01-26 Carburetor output control device

Country Status (6)

Country Link
US (1) US3810606A (de)
JP (1) JPS5032907B2 (de)
CA (1) CA964951A (de)
DE (1) DE2304968C3 (de)
FR (1) FR2170021B1 (de)
GB (1) GB1390868A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987131A (en) * 1973-05-17 1976-10-19 Nissan Motor Co., Ltd. Altitude correction device for a carburetor and carburetor incorporating the same
US4148848A (en) * 1977-10-21 1979-04-10 Toyota Jidosha Kogyo Kabushiki Kaisha Air bleed type carburetor
US4153652A (en) * 1977-09-30 1979-05-08 Toyota Jidosha Kogyo Kabushiki Kaisha Altitude compensating system of a carburetor mounted on a vehicle
US4177224A (en) * 1977-04-25 1979-12-04 Aisin Seiki Kabushiki Kaisha Altitude compensation valve
US4180533A (en) * 1977-02-08 1979-12-25 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburetor for internal combustion engines
US4292258A (en) * 1979-01-26 1981-09-29 Hitachi, Ltd. Altitude compensating device for carburetors
US4298548A (en) * 1979-05-11 1981-11-03 S.I.B.E. Societe Industrielle de Brevets et d'Etudes Carburetors for internal combustion engines
US4472321A (en) * 1981-11-06 1984-09-18 Toyota Jidosha Kabushiki Kaisha Altitude compensation apparatus for carburetor
US4486360A (en) * 1982-07-01 1984-12-04 Allan Elias Carburetor
US5021198A (en) * 1990-01-16 1991-06-04 Bombardier Inc. Carburetor with high altitude compensator
WO2004041419A1 (en) * 2002-11-01 2004-05-21 Woodward Governor Company Gaseous fuel and air mixer assembly for internal combustion engine

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872188A (en) * 1973-02-09 1975-03-18 Acf Ind Inc Apparatus for controlling and modulating engine functions
US3872189A (en) * 1973-02-09 1975-03-18 Acf Ind Inc Apparatus for controlling and modulating engine functions
US3857908A (en) * 1973-02-09 1974-12-31 Acf Ind Inc Apparatus for controlling and modulating engine functions
US3872190A (en) * 1973-02-09 1975-03-18 Acf Ind Inc Apparatus for controlling and modulating engine functions
US3899551A (en) * 1973-02-09 1975-08-12 Acf Ind Inc Apparatus for controlling and modulating engine functions
JPS534344Y2 (de) * 1974-04-03 1978-02-03
JPS5420507Y2 (de) * 1975-03-07 1979-07-24
JPS5251928U (de) * 1975-10-09 1977-04-14
JPS5535106A (en) * 1978-09-01 1980-03-12 Honda Motor Co Ltd Exhaust recirculating apparatus of engine
JPS57106348U (de) * 1980-12-23 1982-06-30
DE4233841A1 (de) * 1992-10-08 1994-06-16 Stihl Maschf Andreas Membranvergaser mit Höhenverstellung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668697A (en) * 1945-12-13 1954-02-09 Niles Bement Pond Co Density responsive valve for carburetors

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2439573A (en) * 1945-09-20 1948-04-13 Mallory Marion Degasser for internal-combustion engines
DE1576524A1 (de) * 1951-01-28 1970-05-21 Deutsche Vergaser Gmbh Co Kg Vorrichtung zur Verbesserung der Kraftstoffverbrennung beim Schiebebetrieb von Kraftfahrzeug-Otto-Motoren
FR1409454A (fr) * 1964-07-17 1965-08-27 Sibe Perfectionnements apportés aux dispositifs de carburation comportant au moins une capsule correctrice assurant, par exemple, une correction altimétrique du dosage du mélange carburant fourni par le dispositif
DE1276405B (de) * 1964-07-17 1968-08-29 Sibe Vergaser fuer Brennkraftmaschinen mit einer barometrischen Steuereinrichtung
JPS5042265Y2 (de) * 1971-11-29 1975-12-01

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668697A (en) * 1945-12-13 1954-02-09 Niles Bement Pond Co Density responsive valve for carburetors

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987131A (en) * 1973-05-17 1976-10-19 Nissan Motor Co., Ltd. Altitude correction device for a carburetor and carburetor incorporating the same
US4180533A (en) * 1977-02-08 1979-12-25 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburetor for internal combustion engines
US4177224A (en) * 1977-04-25 1979-12-04 Aisin Seiki Kabushiki Kaisha Altitude compensation valve
US4153652A (en) * 1977-09-30 1979-05-08 Toyota Jidosha Kogyo Kabushiki Kaisha Altitude compensating system of a carburetor mounted on a vehicle
US4148848A (en) * 1977-10-21 1979-04-10 Toyota Jidosha Kogyo Kabushiki Kaisha Air bleed type carburetor
US4292258A (en) * 1979-01-26 1981-09-29 Hitachi, Ltd. Altitude compensating device for carburetors
US4298548A (en) * 1979-05-11 1981-11-03 S.I.B.E. Societe Industrielle de Brevets et d'Etudes Carburetors for internal combustion engines
US4472321A (en) * 1981-11-06 1984-09-18 Toyota Jidosha Kabushiki Kaisha Altitude compensation apparatus for carburetor
US4486360A (en) * 1982-07-01 1984-12-04 Allan Elias Carburetor
US5021198A (en) * 1990-01-16 1991-06-04 Bombardier Inc. Carburetor with high altitude compensator
WO2004041419A1 (en) * 2002-11-01 2004-05-21 Woodward Governor Company Gaseous fuel and air mixer assembly for internal combustion engine
US6810863B2 (en) 2002-11-01 2004-11-02 Woodward Governor Company Gaseous fuel and air mixer assembly for internal combustion engine

Also Published As

Publication number Publication date
AU5150873A (en) 1973-09-20
FR2170021B1 (de) 1977-08-26
JPS4880923A (de) 1973-10-30
DE2304968A1 (de) 1973-08-30
FR2170021A1 (de) 1973-09-14
CA964951A (en) 1975-03-25
DE2304968B2 (de) 1981-01-29
JPS5032907B2 (de) 1975-10-25
DE2304968C3 (de) 1981-09-24
GB1390868A (en) 1975-04-16

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