US3831909A - Carburetor choke altitude compensation - Google Patents

Carburetor choke altitude compensation Download PDF

Info

Publication number
US3831909A
US3831909A US00303662A US30366272A US3831909A US 3831909 A US3831909 A US 3831909A US 00303662 A US00303662 A US 00303662A US 30366272 A US30366272 A US 30366272A US 3831909 A US3831909 A US 3831909A
Authority
US
United States
Prior art keywords
air
passage
carburetor
valve
airflow
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
US00303662A
Other languages
English (en)
Inventor
R Freismuth
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.)
Ford Motor Co
Original Assignee
Ford Motor Co
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 Ford Motor Co filed Critical Ford Motor Co
Priority to US00303662A priority Critical patent/US3831909A/en
Priority to IT51260/73A priority patent/IT991958B/it
Priority to CA177,839A priority patent/CA985107A/en
Priority to AU58602/73A priority patent/AU452535B2/en
Priority to DE19732349877 priority patent/DE2349877A1/de
Priority to JP48121311A priority patent/JPS525654B2/ja
Priority to GB5076773A priority patent/GB1411159A/en
Application granted granted Critical
Publication of US3831909A publication Critical patent/US3831909A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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

  • Air bypass passages are provided to vary the supply of air when ambient operating conditions change.
  • Stoltman US. Pat. No. 3,011,770 Altitude Compensated Carburetor
  • the air bypass passage in this case has an inlet connected to the induction passage between the choke valve and the venturi and an outlet connected to portions both above and below the conventional throttle valve.
  • the outlet connection as described by Stoltman permits correction for changing ambient operating conditions during engine idle speed operation as well as during other periods. As the altitude increases, the lowering density of the air is offset by the increase of air through the bypass passage.
  • the Stoltman device shows compensating means for correcting for changes in air density, it does not provide additional air for leaning out the starting mixture when the choke valve is closed during cold weather operation. That is, when the choke valve of the Stoltman device is closed, the additional air bypass passage also is effectively blocked off, and, accordingly, the starting mixture will be richer than desired, in the manner stated above.
  • the invention eliminates the above objection by providing a construction in which an additional air supply not only is maintained but also controlled during the choking operation as well as at other times so that the air/fuel mixture is compensated during all engine operations for changes in air density or temperature.
  • FIGURE is a schematic crosssectional view of a portion of a carburetor embodying the invention.
  • the FIGURE shows a portion 10 of a downdraft type carburetor. It includes the usual air induction passage 12 having one end 14 open to air at essentially atmospheric pressure. The opposite end 16 is adapted to be connected to the intake manifold of an internal combustion engine, not shown, so as to subject the induction passage to the changes in engine vacuum level.
  • the passage 12 includes the usual choke valve mounted on a shaft 20 rotatably mounted in the walls of the air horn section of the carburetor.
  • the choke valve is variably rotatable by the usual mechanism, not shown, from the closed position shown to a nearly vertical position permitting unrestricted flow of air through the induction passage.
  • Passage 12 also includes a conventional main venturi 21 and a booster venturi 22. Fuel is inducted, in a known manner, through a tube 24 into booster venturi 22, where it is mixed with the air from inlet 14 for flow past a throttle valve 26. The latter is mounted on a shaft 28 rotatably mounted in the walls of the carburetor body.
  • the carburetor body is formed with an air bypass chamber 29 communicating with a bypass passage 30.
  • An air inlet 32 communicates air at ambient or essentially atmospheric pressure level to chamber 29.
  • One discharge 34 of air passage 30 is located below venturi 22 so as not to cause a metering of fuel through venturi 22 by the air.
  • Passage 30 has an additional discharge outlet 36 located below the closed position of throttle valve 26 to provide additional air during closed throttle, engine idle speed operation.
  • Airflow through passage 30 is controlled in this in stance by a valve means 38 that is movable in response to ambient operating changes. More specifically, the valve means consists of a lower needle valve portion 40 adapted to cooperate with a valve seat 42 formed in a portion of passage 30. It further includes a conical valve 46 that is biased against a seat 48 by a spring 49 to variably block or open the flow of air to outlets 34 and 36. Conical valve portion 46 has a finger actuator 50 engaging a stern extension of the valve, the actuator being formed on one end of a lever 52. The latter is hinged at 54 and movably engaged by an aneroid or bellows 56.
  • the bellows 56 defines a sealed interior chamber under atmospheric or some chosen reference pressure and temperature. A change in the ambient pressure and temperature conditions causes the bellows or aneroid 56 to exert a force upon the connecting lever 52 to move the valve 38 upwardly or downwardly, as the case may be, to thereby vary the airflow through bypass passage 30.
  • the inlet 32 to chamber 29 is controlled by a secondary choking valve 60 rotatably mounted in the carburetor body.
  • Upstanding ears 62 and 64 project from each of the choke valves 18 and 60, and are pivotally interconnected by a link 66 for joint rotation.
  • throttle valve 26 During idle speed operation, throttle valve 26 will be essentially closed. Accordingly, compensation for changes in density at this time will be made by the addition of air through the outlet 36 instead of 34.
  • both the choke valves 18 and 60 will be moved towards an essentially closed position shown.
  • the closed position of choke valve 60 controlling the volume of airflow through inlet 32 will of course be such in proportion to ambient operating conditions that enough additonal air will flow through passage 30 during choking operation when ambient conditions so warrent that the starting and running choking operations will not be overrich or richer than conventional choking operation; yet, the control will be such as to not permit an unlimited supply of air to valve 46, which could make the starting mixture too lean.
  • a carburetor having an induction passage connected to air at one end and to an engine intake manifold at the opposite end and having a venturi connected to a source of fuel for the induction thereof into the passage in response to airflow therepast, a choke valve mounted anterior of the venturi and rotatable at times to control airflow therepast, means defining a separate air passage in a parallel airflow relationship to the induction passage bypassing the venturi for supplying additional air to the induction passage at a location below the venturi, ambient pressure and temperature responsive means for controlling the overall air/fuel ratio in the intake manifold by controlling airflow through the air passage to compensate for changes in air density of the air in the induction passage with changes in altitude and temperature, and control means coupled to the choke valve to maintain a controlled supply of air to the air passage when the choke valve is rotated to a choking position.
  • control means comprising a second valve controlling the airflow to the air passage.
  • a carburetor as in claim l the pressure and temperature responsive means including a further valve movable with respect to the air passage in response to ambient operating conditions to control the airflow therethrough.
  • control means comprising a second valve controlling the inlet of air to the further valve.
  • a carburetor as in claim 2 including linkage means movably connecting the choke and second valves to variably control the flow through both passages.
  • a carburetor as in claim 1, the ambient pressure and temperature responsive means comprising a bellows connected to valve means controlling the flow of air through the air passage and spring biased to close the air passage.
  • a carburetor having an induction passage connected to air at one end and to an engine intake manifold at the opposite end and having a venturi inbetween connected to a source of fuel for the induction of fuel into the passage in response to airflow therepast, a choke valve mounted anterior of the venturi and rotatable at times to control airflow through the passage, means defining an air passage separate from the induction passage for supplying air thereto around the venturi, the air passage having an air inlet in parallel with the induction passage air inlet and connected at its other end to the induction passage below the venturi, valve means movable in response to ambient pressure and temperature changes for controlling airflow through the air passage to compensate for changes in air density of the air in the induction passage with changes in altitude and temperature, and additional valve means in the air passage air inlet pivotally connected to the choke valve for concurrent operation for controlling the supply of air to the air passage when the choke valve is rotated to a choking position essentially closing the induction passage air inlet and decreasing the additional air passage airflow in proportion to the

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)
US00303662A 1972-11-03 1972-11-03 Carburetor choke altitude compensation Expired - Lifetime US3831909A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00303662A US3831909A (en) 1972-11-03 1972-11-03 Carburetor choke altitude compensation
IT51260/73A IT991958B (it) 1972-11-03 1973-07-05 Compensatore di quota per carbura tori di motori a combustione interna
CA177,839A CA985107A (en) 1972-11-03 1973-07-27 Carburetor choke altitude compensation
AU58602/73A AU452535B2 (en) 1972-11-03 1973-07-27 Carburetor choke altitude compensation
DE19732349877 DE2349877A1 (de) 1972-11-03 1973-10-04 Vergaser fuer brennkraftmaschinen
JP48121311A JPS525654B2 (id) 1972-11-03 1973-10-30
GB5076773A GB1411159A (en) 1972-11-03 1973-11-01 Carburettor for an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00303662A US3831909A (en) 1972-11-03 1972-11-03 Carburetor choke altitude compensation

Publications (1)

Publication Number Publication Date
US3831909A true US3831909A (en) 1974-08-27

Family

ID=23173126

Family Applications (1)

Application Number Title Priority Date Filing Date
US00303662A Expired - Lifetime US3831909A (en) 1972-11-03 1972-11-03 Carburetor choke altitude compensation

Country Status (7)

Country Link
US (1) US3831909A (id)
JP (1) JPS525654B2 (id)
AU (1) AU452535B2 (id)
CA (1) CA985107A (id)
DE (1) DE2349877A1 (id)
GB (1) GB1411159A (id)
IT (1) IT991958B (id)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920777A (en) * 1974-01-04 1975-11-18 Ford Motor Co Carburetor fast idle cam throttle positioner
US3943206A (en) * 1973-12-12 1976-03-09 Ford Motor Company Carburetor temperature responsive throttle plate positioner
US3956434A (en) * 1974-01-04 1976-05-11 Ford Motor Company Carburetor cold enrichment fuel metering signal and air flow modulator
US4044736A (en) * 1973-07-18 1977-08-30 Toyota Jidosha Kogyo Kabushiki Kaisha Device for controlling a choke valve in a carburetor
US4075993A (en) * 1975-09-03 1978-02-28 Robert Bosch Gmbh Fuel mixture control apparatus
US4094288A (en) * 1975-12-18 1978-06-13 Davis William E Carburetor for engines using diesel fuel
US5527367A (en) * 1993-12-03 1996-06-18 Nippon Carbureter Co., Ltd. Mixer for a gas-fueled engine
US20110121471A1 (en) * 2009-11-25 2011-05-26 Satoru Araki Carburetor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5284328A (en) * 1976-01-07 1977-07-13 Hitachi Ltd Atmospheric compensating apparatus of carburetor
JPS54160927A (en) * 1978-06-12 1979-12-20 Honda Motor Co Ltd Device for correcting intaken air amount for engine
JP2888271B2 (ja) * 1994-03-30 1999-05-10 日本電気株式会社 無人飛翔体の姿勢制御装置
DE10000885A1 (de) 2000-01-12 2001-07-19 Henricus Geradus Corneli Moers Verfahren zum Zuführen eines Kraftstoff-Luft-Gemisches an einen Verbrennungsmotor und Vorrichtung zum Durchführen des Verfahrens

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1089423A (en) * 1911-01-05 1914-03-10 Godfried J Mayer Carbureter.
US2495299A (en) * 1947-09-30 1950-01-24 Bendix Aviat Corp Charge forming device
US3011770A (en) * 1959-11-02 1961-12-05 Gen Motors Corp Altitude compensated carburetor
US3721428A (en) * 1970-11-20 1973-03-20 P Gele Constant negative-pressure carburettors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1089423A (en) * 1911-01-05 1914-03-10 Godfried J Mayer Carbureter.
US2495299A (en) * 1947-09-30 1950-01-24 Bendix Aviat Corp Charge forming device
US3011770A (en) * 1959-11-02 1961-12-05 Gen Motors Corp Altitude compensated carburetor
US3721428A (en) * 1970-11-20 1973-03-20 P Gele Constant negative-pressure carburettors

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044736A (en) * 1973-07-18 1977-08-30 Toyota Jidosha Kogyo Kabushiki Kaisha Device for controlling a choke valve in a carburetor
US3943206A (en) * 1973-12-12 1976-03-09 Ford Motor Company Carburetor temperature responsive throttle plate positioner
US3920777A (en) * 1974-01-04 1975-11-18 Ford Motor Co Carburetor fast idle cam throttle positioner
US3956434A (en) * 1974-01-04 1976-05-11 Ford Motor Company Carburetor cold enrichment fuel metering signal and air flow modulator
US4075993A (en) * 1975-09-03 1978-02-28 Robert Bosch Gmbh Fuel mixture control apparatus
US4094288A (en) * 1975-12-18 1978-06-13 Davis William E Carburetor for engines using diesel fuel
US5527367A (en) * 1993-12-03 1996-06-18 Nippon Carbureter Co., Ltd. Mixer for a gas-fueled engine
US20110121471A1 (en) * 2009-11-25 2011-05-26 Satoru Araki Carburetor
US8613429B2 (en) * 2009-11-25 2013-12-24 Zama Japan Kabushiki Kaisha Carburetor

Also Published As

Publication number Publication date
AU452535B2 (en) 1974-09-05
IT991958B (it) 1975-08-30
AU5860273A (en) 1974-09-05
CA985107A (en) 1976-03-09
JPS525654B2 (id) 1977-02-15
DE2349877A1 (de) 1974-05-09
GB1411159A (en) 1975-10-22
JPS4977032A (id) 1974-07-25

Similar Documents

Publication Publication Date Title
US3243167A (en) Constant vacuum type carburetor
US3831909A (en) Carburetor choke altitude compensation
US3836128A (en) Carburetor ambient mixture control
US3752451A (en) Fuel metering device for internal combustion engine
US4453523A (en) Pressure balanced flow regulator for gaseous fuel engine
US2431590A (en) Auxiliary charge metering device
US3077341A (en) Carburetor
US3747903A (en) Fuel supply system
US2477481A (en) Antidetonating device
US4095567A (en) Carburation devices with idle adjustment
US3956434A (en) Carburetor cold enrichment fuel metering signal and air flow modulator
US2588136A (en) Charge control valve mechanism for internal-combustion engines
US3278173A (en) Carburetor
US3744470A (en) Engine anti-diesel control
US3831910A (en) Carburetors
US3872188A (en) Apparatus for controlling and modulating engine functions
US3899551A (en) Apparatus for controlling and modulating engine functions
US1676828A (en) And thomas r
US3897765A (en) Carburetor cranking fuel flow rate control
US4282846A (en) Exhaust gas recirculating device
US3920777A (en) Carburetor fast idle cam throttle positioner
US3880962A (en) Method and apparatus for varying fuel flow to compensate for changes in barometric pressure and altitude
US4171686A (en) Carburation devices with idle adjustment
US2658733A (en) Accelerating pump control fob
US4190028A (en) Mixture forming assembly for closed loop air-fuel metering system