US3693947A - Carburettor - Google Patents

Carburettor Download PDF

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Publication number
US3693947A
US3693947A US69392A US3693947DA US3693947A US 3693947 A US3693947 A US 3693947A US 69392 A US69392 A US 69392A US 3693947D A US3693947D A US 3693947DA US 3693947 A US3693947 A US 3693947A
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US
United States
Prior art keywords
main
mixture
air
engine
fuel
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 - Lifetime
Application number
US69392A
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English (en)
Inventor
Kenji Masaki
Sinzo Kato
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
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Application granted granted Critical
Publication of US3693947A publication Critical patent/US3693947A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M1/10—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 engine temperature, e.g. having thermostat
    • 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
    • F02M1/04—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being auxiliary carburetting apparatus able to be put into, and out of, operation, e.g. having automatically-operated disc valves
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S251/00—Valves and valve actuation
    • Y10S251/903—Needle valves
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/38—Needle valves

Definitions

  • ABSTRACT A mixture supply control system for an internal combustion engine of a motor vehicle, comprising valve means for controlling the effective area of the main fuel jet of the main mixture circuit, and temperature sensing means for controlling the operation of the valve means in response to the temperature of the engine.
  • the mixture supply control system supplies to 'the engine an appropriate amount of enriched mixture for the initial cold engine and subsequent warming-up operations so as to improve the drivability of the vehicle.
  • This invention relates to carburettors for internal combustion engines used in motor vehicles and particularly to carburettors having a mixture supply control system for feeding to the engine a satisfactory amount of enriched air-fuel mixture for the initial cold-engine and subsequent warm-up operations.
  • the engine exhaust emission of the noxious air pollutants such as carbon monoxide, hydrocarbons and nitrogen oxides can be reduced to a minimum only if an air-fuel mixture is burned completely at its stoichiometric ratio in the combustion chamber. It is found, however, quite difficult to accomplish complete combustion in the engine for all the varying drive conditions of the vehicle.
  • the above noxious pollutants are produced in different quantities varying in the kind of the pollutants dependent on the running conditions of the engine. For instance, the quantity of nitrogen oxides emitted is large when the air-fuel mixture is lean bons are large when the mixture is rich.
  • the emission of nitrogen oxides can be made so small, however, as to cause no serious air-pollution problem even with a lean mixture, if the engine has not fully warmed up. Under these circumstances, there has been a growing tendency to construct the carburettors of known types in a manner to provide a lean mixture without or with little respect tothe varying driving conditions of the vehicle.
  • T he drivability deterioration is often experienced as such phenomena as engine stalling when starting, lack of power for acceleration or knocking of the engine under all driving conditions from low to intermediate speed ranges of the vehicle, and occurs particularly when the ambient temperature is low and/or when the engine is being warmed up.
  • socalled cold driving is often performed these days by most drivers without allowing ample time for warmingup, thus affecting the drivability of the vehicle still more.
  • This invention is based on the experiments conducted by us using carburettors which provide a lean air-fuel mixture, which experiments have revealed that during the cold driving" the improvement of drivability is effected if an enriched mixture is supplied through the main mixture circuit rather than through the slowrunning circuit.
  • These preparations necessary for warming up the engine up to a predetermined level before starting to move the vehicle are known to continue for 5 to 15 minutes depending upon the ambient temperature.
  • the temperature level thus determined previously is, for example, 50 C. in terms of the temperature of the engine cooling liquid. Considering the short period ranging from 5 to 15 minutes, the emission of the pollutants contained in the exhaust gases during the cold driving is not considerable when compared with the total amount exhausted during all driving conditions, even if an over-rich mixture is consumed in the engine during this period.
  • the mixture supply control system proposed by this invention is constructed and arranged in such a manner that an air-fuel mixture having a sufficiently rich airfuel ratio is fed to the engine during the initial cold-engine and subsequent warm-up operations by varying the effective area of the main fuel jet.
  • This effective area is controlled by valve means provided in the neighborhood of the main jet in response to the temperature of the engine which condition is detected by temperature sensing-means.
  • Another object is to provide a carburettor having a main fuel jet of varying effective area and valve means for controlling the effective area of the main fuel jet responsive to the temperature condition of the engine, thereby improving the drivability of the vehicle.
  • the mixture supply control systems implementing the invention which are generally denoted by numerals l0 and 10', respectively, in FIGS. 1 and 2, are used in a conventional carburettor 12.
  • the carburettor 12 is, as is well known, provided with a throttle valve 14, a main venturi 16, a small venturi 16, a main mixture circuit 18, an idling and slow running mixture circuit 20 and float chamber 22.
  • the throttle valve 14 is mounted on a rotatable shaft 14a in the carburetor induction passage and is herein shown as substantially fully closed to effect idling or deceleration of the motor vehicle.
  • main fuel jet 30, a main fuel and air mixer 32 and a main nozzle 34 in this sequence from the float chamber 22.
  • the main atomizer 32 has formed at its bottom an orifice 32a and at its top an air bleed 32b vented from the open air.
  • the orifice 32a and air bleed 32b are so calibrated as to provide a desired amount of lean airfuel mixture, so that a lean mixture is produced through the main-circuit 18 for delivering to the engine so as to minimize the air pollutant content in the engine exhaust gases.
  • a slow-running and air mixer 36 which has formed at its bottom an orifice 36a and a first air bleed 36b vented from the ambient atmosphere. Downstream of the first air bleed 36b is provided a second air bleed 36c which is also vented from the ambient atmosphere.
  • the first and second air bleeds 36b and 360, respectively, are so calibrated as to admit air from the ambient air at desired flow rates. While the engine is being driven under idling or light load conditions with the throttle valve 14 substantially fully closed, the air flow rate delivered into the engine is not large and, therefore, a high vacuum is not established in the small venturi 16'. Thus, a metered air-fuel mixture is supplied to the engine through the slow-running port 24 and/or idling port 26. 7
  • a mixture 1 supply control system which comprises in combination a valve assembly 38 for controlling the effective area of the main jet of the main fuel mixture circuit 18 and temperature sensing.
  • means 40 for controlling the operation of said valve means 38 in response to the temperature of the engine.
  • the solenoid'coil 44a is electrically connected in series to a power source 46 through a main switch 48 and the thermoswitch 42 by a line 50.
  • the thermoswitch 42 is constituted, for instance, as a normallyopen relay switch which is connected to and actuated by a temperature detector (not shown). This temperature detector is adapted to detect the temperature of the engine, so that it may be provided directly on the wall or in the air cleaner (not shown) of the carburettor 12 or may be immersed in the engine cooling liquid.
  • the needle element 380 is provided at its operative end with a conical tip 38b having a conduit 38c extending therethrough.
  • the effective area of this conduit 380 is calibrated as to allow a predetermined amount of the liquid fuel to flow from the float chamber 22 into the main mixture circuit 18, when the conical tip 38b of the needle element 38a is in abutting engagement with the main fuel jet 30.
  • the flow rate of the fuel through the conduit 38c is such that the main mixture circuit supplies a satisfactory amount of lean mixture to the engine after the engine has reached its normal operating temperature.
  • thermoswitch 42 is closed when the temperature detector detects a cold engine and/or warming-up of the engine.
  • the solenoid coil 44a is energized with the thermoswitch 42 closed, the movable core 44b is retracted away from the main fuel jet 30 together with the needle element 38a against the action of the compression spring Me. This unseats the needle tip 38b 38a from the orifice of the main fuel jet 30, thus providing increased communication between the main fuel circuit 18 and the float chamber 22. As a result, a rich mixture is produced by the main mixture circuit 18.
  • the solenoid coil 44a When the solenoid coil 44a is de-energized after the engine has reached its normal operating temperature with the thermoswitch 42 opened, the movable core 44b is urged toward the main fuel jet 30 together with the needle element 38a by the action of the compression spring 440. Then, the conical tip 38b of the needle element 38a is seated on the main fuel jet 30, thus providing communication between the main mixture circuit 18 and the float chamber 22 only through the conduit 380. It follows that a predetermined amount of the liquid fuel is supplied into the main mixture circuit 18, thus providing a lean mixture.
  • the operation of the valve assembly 38' is controlled by a bimetal device 56 acting as the temperature sensing means 40.
  • the bimetal device 56 is positioned between and in abutting engagement both with the plate 52 and with the other inside end wall of the body of the valve assembly 38.
  • the bimetal device 56 has at least one bimetal unit 56a having a central aperture (not numbered) through which the needle element 38a is axially movable toward and away from the main fuel jet 30.
  • three bimetal units 56a are shown in axially aligned series, merely by way of example.
  • valve assembly 38' using this bimetal device 56 can vary continuously the effective area or clearance formed between the surface of the conical tip 38'b and the main fuel jet 30. As a result, the fuel flow rate passing through this effective area is continuously controlled in accordance with the ambient temperature.
  • a sufficient amount of enriched mixture is supplied to the engine during the cold running of the engine, whereby the engine can be driven with a satisfactory quality performance as well as with a quick warm-up period.
  • lean mixture is supplied to the engine when has reached its normal operating temperature.

Landscapes

  • 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)
  • Means For Warming Up And Starting Carburetors (AREA)
US69392A 1969-09-09 1970-09-03 Carburettor Expired - Lifetime US3693947A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7137569 1969-09-09

Publications (1)

Publication Number Publication Date
US3693947A true US3693947A (en) 1972-09-26

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ID=13458678

Family Applications (1)

Application Number Title Priority Date Filing Date
US69392A Expired - Lifetime US3693947A (en) 1969-09-09 1970-09-03 Carburettor

Country Status (6)

Country Link
US (1) US3693947A (pt)
DE (1) DE2044704C3 (pt)
FR (1) FR2061119A5 (pt)
GB (1) GB1302422A (pt)
NL (1) NL151165B (pt)
SE (1) SE366093B (pt)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056932A (en) * 1974-11-01 1977-11-08 Nissan Motor Co., Ltd. Control system for promoting catalytic removal of noxious components from exhaust gas of internal combustion engine
US4087492A (en) * 1976-11-02 1978-05-02 Toyota Jidosha Kogyo Kabushiki Kaisha Slow fuel supply system
US4096212A (en) * 1977-01-26 1978-06-20 Ford Motor Company Carburetor choke valve positioner
US4108123A (en) * 1976-07-30 1978-08-22 Toyota Jidosha Kogyo Kabushiki Kaisha Carburetor
US4114584A (en) * 1977-01-26 1978-09-19 Ford Motor Company Carburetor choke positive closure mechanism
US4175103A (en) * 1978-04-17 1979-11-20 General Motors Corporation Carburetor
US4178332A (en) * 1978-01-11 1979-12-11 General Motors Corporation Carburetor and method of calibration
US4240989A (en) * 1978-06-02 1980-12-23 Nissan Motor Company, Limited Carburetor with multiconduit nozzle
USRE30622E (en) * 1978-04-17 1981-05-26 Teledyne Industries, Inc. Fuel metering apparatus for a carburetor
US4492208A (en) * 1983-07-01 1985-01-08 Mcgraw-Edison Company Liquid propane gas fuel system
US4520281A (en) * 1979-08-20 1985-05-28 Imperial Clevite Inc. Wide pulse range periodic reverse unit
US4528966A (en) * 1983-07-01 1985-07-16 Mcgraw-Edison Company Propane fuel system
US6702262B2 (en) * 2001-03-15 2004-03-09 Zama Japan Fuel system of carburetor
WO2008070767A2 (en) * 2006-12-06 2008-06-12 Husqvarna Consumer Outdoor Products N.A., Inc. Multi-chambered fuel enrichment device
US20090211555A1 (en) * 2005-12-10 2009-08-27 Bing Power Systems Gmbh Carburetor for a Combustion Engine, and Method for the Controlled Delivery of Fuel

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965221A (en) * 1974-07-03 1976-06-22 Dresser Industries, Inc. Fluid flow device and liquid metering
FR2512116B1 (fr) * 1981-09-01 1985-07-26 Malherbe Andre Dispositif de gicleur a debit variable adaptable aux carburateurs automobile

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1544350A (en) * 1923-10-29 1925-06-30 Glen R Sisson Mixture control for internal-combustion engines
US1699468A (en) * 1929-01-15 grayson
US1973162A (en) * 1932-09-21 1934-09-11 Briggs & Stratton Corp Carburetor
US2074471A (en) * 1932-06-09 1937-03-23 Geo M And Earl Holley Engineer Thermostatic control of automobile engine fuel
US2341694A (en) * 1940-10-12 1944-02-15 Carter Carburetor Corp Carburetor
US2401643A (en) * 1944-09-01 1946-06-04 Heywood Compressor Company Ltd Priming arrangement for gasoline and like engines
US2711883A (en) * 1952-10-09 1955-06-28 Reeves Edward Carburetor
FR1337410A (fr) * 1962-07-31 1963-09-13 Dispositif isolant le circuit d'alimentation du ralenti, pendant la décélération
US3278171A (en) * 1963-10-28 1966-10-11 Acf Ind Inc Carburetor
US3374951A (en) * 1966-04-28 1968-03-26 Robertshaw Controls Co Dual thermostatic control device
US3447746A (en) * 1966-10-17 1969-06-03 Emerson Electric Co Burner control device for a water heater
US3587553A (en) * 1969-07-24 1971-06-28 Bendix Corp Carburetor priming system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1699468A (en) * 1929-01-15 grayson
US1544350A (en) * 1923-10-29 1925-06-30 Glen R Sisson Mixture control for internal-combustion engines
US2074471A (en) * 1932-06-09 1937-03-23 Geo M And Earl Holley Engineer Thermostatic control of automobile engine fuel
US1973162A (en) * 1932-09-21 1934-09-11 Briggs & Stratton Corp Carburetor
US2341694A (en) * 1940-10-12 1944-02-15 Carter Carburetor Corp Carburetor
US2401643A (en) * 1944-09-01 1946-06-04 Heywood Compressor Company Ltd Priming arrangement for gasoline and like engines
US2711883A (en) * 1952-10-09 1955-06-28 Reeves Edward Carburetor
FR1337410A (fr) * 1962-07-31 1963-09-13 Dispositif isolant le circuit d'alimentation du ralenti, pendant la décélération
US3278171A (en) * 1963-10-28 1966-10-11 Acf Ind Inc Carburetor
US3374951A (en) * 1966-04-28 1968-03-26 Robertshaw Controls Co Dual thermostatic control device
US3447746A (en) * 1966-10-17 1969-06-03 Emerson Electric Co Burner control device for a water heater
US3587553A (en) * 1969-07-24 1971-06-28 Bendix Corp Carburetor priming system

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056932A (en) * 1974-11-01 1977-11-08 Nissan Motor Co., Ltd. Control system for promoting catalytic removal of noxious components from exhaust gas of internal combustion engine
US4108123A (en) * 1976-07-30 1978-08-22 Toyota Jidosha Kogyo Kabushiki Kaisha Carburetor
US4087492A (en) * 1976-11-02 1978-05-02 Toyota Jidosha Kogyo Kabushiki Kaisha Slow fuel supply system
US4096212A (en) * 1977-01-26 1978-06-20 Ford Motor Company Carburetor choke valve positioner
US4114584A (en) * 1977-01-26 1978-09-19 Ford Motor Company Carburetor choke positive closure mechanism
US4178332A (en) * 1978-01-11 1979-12-11 General Motors Corporation Carburetor and method of calibration
US4175103A (en) * 1978-04-17 1979-11-20 General Motors Corporation Carburetor
USRE30622E (en) * 1978-04-17 1981-05-26 Teledyne Industries, Inc. Fuel metering apparatus for a carburetor
US4240989A (en) * 1978-06-02 1980-12-23 Nissan Motor Company, Limited Carburetor with multiconduit nozzle
US4520281A (en) * 1979-08-20 1985-05-28 Imperial Clevite Inc. Wide pulse range periodic reverse unit
US4492208A (en) * 1983-07-01 1985-01-08 Mcgraw-Edison Company Liquid propane gas fuel system
US4528966A (en) * 1983-07-01 1985-07-16 Mcgraw-Edison Company Propane fuel system
US6702262B2 (en) * 2001-03-15 2004-03-09 Zama Japan Fuel system of carburetor
US20040075180A1 (en) * 2001-03-15 2004-04-22 Zama Japan Fuel system of carburetor
US6845972B2 (en) 2001-03-15 2005-01-25 Zama Japan Fuel system of carburetor
US20050062176A1 (en) * 2001-03-15 2005-03-24 Zama Japan Fuel system of carburetor
US20090211555A1 (en) * 2005-12-10 2009-08-27 Bing Power Systems Gmbh Carburetor for a Combustion Engine, and Method for the Controlled Delivery of Fuel
WO2008070767A2 (en) * 2006-12-06 2008-06-12 Husqvarna Consumer Outdoor Products N.A., Inc. Multi-chambered fuel enrichment device
US20080135018A1 (en) * 2006-12-06 2008-06-12 Husqvarna Outdoor Products Inc. Multi-chambered fuel enrichment device
WO2008070767A3 (en) * 2006-12-06 2008-11-06 Husqvarna Outdoor Products Inc Multi-chambered fuel enrichment device
US7546825B2 (en) * 2006-12-06 2009-06-16 Husqvarna Outdoor Products Inc. Multi-chambered fuel enrichment device

Also Published As

Publication number Publication date
FR2061119A5 (pt) 1971-06-18
DE2044704A1 (de) 1971-04-22
NL151165B (nl) 1976-10-15
NL7013331A (pt) 1971-03-11
DE2044704C3 (de) 1974-06-20
GB1302422A (pt) 1973-01-10
DE2044704B2 (de) 1973-11-22
SE366093B (pt) 1974-04-08

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