US3836128A - Carburetor ambient mixture control - Google Patents

Carburetor ambient mixture control Download PDF

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Publication number
US3836128A
US3836128A US00303572A US30357272A US3836128A US 3836128 A US3836128 A US 3836128A US 00303572 A US00303572 A US 00303572A US 30357272 A US30357272 A US 30357272A US 3836128 A US3836128 A US 3836128A
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US
United States
Prior art keywords
air
passage
venturi
induction
changes
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
US00303572A
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English (en)
Inventor
M Lunsford
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Ford Motor Co
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Ford Motor Co
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Filing date
Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Priority to US00303572A priority Critical patent/US3836128A/en
Priority to AU58599/73A priority patent/AU446668B2/en
Priority to CA177,734A priority patent/CA988383A/en
Priority to DE2348045A priority patent/DE2348045C3/de
Priority to GB4877573A priority patent/GB1415420A/en
Priority to JP48120035A priority patent/JPS525653B2/ja
Application granted granted Critical
Publication of US3836128A publication Critical patent/US3836128A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

  • McCollum [5 7 ABSTRACT The carburetor has an air bypass passage for supplying additional air around the venturi to the air/fuel mixture in response to ambient operating conditions, the air bypass passage being controlled by valve means sensitive to changes in ambient conditions and inc1uding an additional air bleed for supplying air to the bypass passage when the carburetor choke valve is closed so as to lean out the overrich mixture that would normally be provided with changes in ambient operating conditions if such an air bleed were not provided.
  • This invention relates, in general, to a carburetor for an internal combustion engine. More particularly, it relates'to one that compensates for the change in density of the air due to changes in altitude and temperature.
  • 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 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 permits correction for changing ambient operating conditions during engine idle speed operation as well as other periods.
  • 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 air supply is maintained and 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.
  • FIG. 1 is a schematic crosssectional view of a portion of a carburetor embodying the invention.
  • FIG. 2 is a modification of the design shown in FIG. 1.
  • FIG. 1 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. Its other 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 18 unbalance 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 venturi 22 into which is inducted, in a known manner, the main supply of fuel through a tube 24 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 provided with an air bypass passage 30 that has an air inlet 32 opening into induction passage 12 between the choke valve 18 and the inlet to venturi 22.
  • the air in inlet 32 therefore, is essentially at atmospheric pressure level.
  • One discharge 34 of the air passage is located below venturi 22 so as to be closer to an atmospheric pressure level than the reduced pressure obtained at the throat of venturi 22. The reason for bypassing the venturi, of course, is so that the additional airflow supplied through passage 30 will not cause any additional flow of fuel from the nozzle 24.
  • the 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 instance by a valve means 38 that is movable in response to ambient operating changes. More specifically, the valve means has a lower needle like valve 40 adapted to cooperate with a valve seat 42 formed in the throttle flange portion 44. It further includes a conical valve 46 that is biased against a seat 48 by a spring 49 to block or open in a variable manner the flow of air to both passages 34 and 36.
  • the conical valve portion 46 has a stem actuator 50 extending through an aperture 52 in the carburetor body for connection with one end of a lever 53. The latter is hinged at 54 and movable by an aneroid or bellows 56.
  • the bellows 56 defines a sealed interiorchamber under atmospheric or some similar reference pressure, a change in the ambient pressure and temperature conditions causing the bellows or aneroid to exert a force upon the connecting lever 53 to move the valve 38 upwardly or downwardly, as the case may be, to thereby vary the airflow through the bypass passage 30.
  • the carburetor body is provided with a further air inlet hole 60 of a controlled size that, in a manner to be described, continues to supply air to the passage 30 even though the air inlet 32 is essentially closed when the choke valve 18 is closed.
  • 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 discharge passage 36 instead of the passage 34.
  • the choke valve 18 is essentially closed in the position shown. Accordingly, at this time, the air inlet 32 would also be essentially closed and no additional air would flow through the passage 30. However, the inclusion of the aperture 60 of a controlled size permits a controlled quantity of air to be added to the air passage 30 for passage into either of the discharge portions 34 or 36. This results in a leaning of the choking mixture to the level provided at other ambient operating conditions.
  • FIG. 2 shows a modified form of valve 38 for control of the starting mixture when the choke valve 18 again is closed.
  • a conical needle-like valve 70 is added to the stem 50' of valve 38' and cooperates with an opening 52 to variably increase the airflow into bypass passage 30 with changes in ambient operating conditions. Accordingly, the choking mixture will be controlled in a variable manner as a function of the changes in ambient operating conditions.
  • 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 in be tween adapted to be 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, an air passage for supplying air directly to the induction passage 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 with changes in altitude and temperature, and separate means to maintain a controlled supply of air to the air passage when the choke valve is rotated to a choking position, the separate means comprising an air bleed opening of a controlled size, valve means movably mounted with respect to the air bleed opening to variably control the flow therethrough, and means connecting the valve means to the ambient pressure and temperature responsive means.
  • 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 adapted to be 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, an air passage for bypassing air around the venturi, the air passage being connected at its air'inlet end to the induction passage between the choke valve and the venturi and 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 with changes in altitude and temperature, and additional air inlet means for supplying air to the air passage when the choke valve is rotated to a choking position essentially closing the air passage air inlet, the additional air inlet means comprising an air bleed connected to the air passage outside of the induction passage and in a parallel flow relationship with the air inlet to the air

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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)
  • Means For Warming Up And Starting Carburetors (AREA)
US00303572A 1972-11-03 1972-11-03 Carburetor ambient mixture control Expired - Lifetime US3836128A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00303572A US3836128A (en) 1972-11-03 1972-11-03 Carburetor ambient mixture control
AU58599/73A AU446668B2 (en) 1972-11-03 1973-07-27 Carburetor ambient mixture control
CA177,734A CA988383A (en) 1972-11-03 1973-07-31 Carburetor ambient mixture control
DE2348045A DE2348045C3 (de) 1972-11-03 1973-09-24 Vergaser für Brennkraftmaschinen
GB4877573A GB1415420A (en) 1972-11-03 1973-10-19 Carburettor
JP48120035A JPS525653B2 (OSRAM) 1972-11-03 1973-10-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00303572A US3836128A (en) 1972-11-03 1972-11-03 Carburetor ambient mixture control

Publications (1)

Publication Number Publication Date
US3836128A true US3836128A (en) 1974-09-17

Family

ID=23172706

Family Applications (1)

Application Number Title Priority Date Filing Date
US00303572A Expired - Lifetime US3836128A (en) 1972-11-03 1972-11-03 Carburetor ambient mixture control

Country Status (6)

Country Link
US (1) US3836128A (OSRAM)
JP (1) JPS525653B2 (OSRAM)
AU (1) AU446668B2 (OSRAM)
CA (1) CA988383A (OSRAM)
DE (1) DE2348045C3 (OSRAM)
GB (1) GB1415420A (OSRAM)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925521A (en) * 1973-05-18 1975-12-09 Hitachi Ltd Variable Venturi type carburetor
US3943899A (en) * 1973-04-06 1976-03-16 Toyo Kogyo Co., Ltd. Atmospheric pressure compensating means for an engine intake system
US4124005A (en) * 1976-05-15 1978-11-07 Robert Bosch Gmbh Supplementary air supply system for an internal combustion engine
US4128086A (en) * 1976-02-10 1978-12-05 Alfa Romeo S.P.A. Automatic device for controlling the pressure of the intake air of an I.C. engine as its operating altitude varies
US4820454A (en) * 1986-04-04 1989-04-11 Tillotson Limited Starting aid for small internal combustion engines
WO1996012882A1 (en) * 1994-10-21 1996-05-02 Aktiebolaget Electrolux Temperature compensated choke
US6135428A (en) * 1997-08-29 2000-10-24 Andreas Stihl Ag & Co. Diaphragm carburetor for an internal combustion engine with a manual starter
US20090043485A1 (en) * 2007-08-07 2009-02-12 Banks Gale C Apparatus and Method for Engine Performance Evaluation
US20160177892A1 (en) * 2014-12-17 2016-06-23 Eagle Actuator Components Gmbh & Co. Kg Valve for regeneration in turbocharger operation
US10947937B2 (en) * 2018-04-19 2021-03-16 Volkswagen Aktiengesellschaft Functional component for influencing tank ventilation and arrangement of a functional component for influencing tank ventilation on an intake pipe

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2529178C2 (de) * 1975-07-01 1986-08-07 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Anordnung zur Regelung des einer Brennkraftmaschine zugeführten Kraftstoff-Luft-Gemisches
JPS5535106A (en) * 1978-09-01 1980-03-12 Honda Motor Co Ltd Exhaust recirculating apparatus of engine
JPS5537504A (en) * 1978-09-07 1980-03-15 Honda Motor Co Ltd Exahust recycling device for engine
JPS59168238A (ja) * 1983-03-11 1984-09-21 Honda Motor Co Ltd 内燃エンジンのアイドル回転数フイ−ドバツク制御方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230159A (en) * 1938-04-18 1941-01-28 Herbert J Kratzer Compensating device for carburetors of internal combustion motors
US3011770A (en) * 1959-11-02 1961-12-05 Gen Motors Corp Altitude compensated carburetor
US3186692A (en) * 1962-06-20 1965-06-01 Holley Carburetor Co Idle air bypass means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230159A (en) * 1938-04-18 1941-01-28 Herbert J Kratzer Compensating device for carburetors of internal combustion motors
US3011770A (en) * 1959-11-02 1961-12-05 Gen Motors Corp Altitude compensated carburetor
US3186692A (en) * 1962-06-20 1965-06-01 Holley Carburetor Co Idle air bypass means

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943899A (en) * 1973-04-06 1976-03-16 Toyo Kogyo Co., Ltd. Atmospheric pressure compensating means for an engine intake system
US3925521A (en) * 1973-05-18 1975-12-09 Hitachi Ltd Variable Venturi type carburetor
US4128086A (en) * 1976-02-10 1978-12-05 Alfa Romeo S.P.A. Automatic device for controlling the pressure of the intake air of an I.C. engine as its operating altitude varies
US4124005A (en) * 1976-05-15 1978-11-07 Robert Bosch Gmbh Supplementary air supply system for an internal combustion engine
US4820454A (en) * 1986-04-04 1989-04-11 Tillotson Limited Starting aid for small internal combustion engines
US5992829A (en) * 1994-10-21 1999-11-30 Aktiebolaget Electrolux Temperature compensated choke
WO1996012882A1 (en) * 1994-10-21 1996-05-02 Aktiebolaget Electrolux Temperature compensated choke
US6135428A (en) * 1997-08-29 2000-10-24 Andreas Stihl Ag & Co. Diaphragm carburetor for an internal combustion engine with a manual starter
US20090043485A1 (en) * 2007-08-07 2009-02-12 Banks Gale C Apparatus and Method for Engine Performance Evaluation
US7593808B2 (en) * 2007-08-07 2009-09-22 Banks Gale C Apparatus and method for engine performance evaluation
US20160177892A1 (en) * 2014-12-17 2016-06-23 Eagle Actuator Components Gmbh & Co. Kg Valve for regeneration in turbocharger operation
US9863379B2 (en) * 2014-12-17 2018-01-09 Eagle Actuator Components Gmbh & Co. Kg Valve for regeneration in turbocharger operation
US10947937B2 (en) * 2018-04-19 2021-03-16 Volkswagen Aktiengesellschaft Functional component for influencing tank ventilation and arrangement of a functional component for influencing tank ventilation on an intake pipe

Also Published As

Publication number Publication date
GB1415420A (en) 1975-11-26
AU446668B2 (en) 1974-03-28
DE2348045B2 (de) 1980-12-18
JPS525653B2 (OSRAM) 1977-02-15
CA988383A (en) 1976-05-04
JPS4977036A (OSRAM) 1974-07-25
DE2348045A1 (de) 1974-05-16
DE2348045C3 (de) 1981-09-03
AU5859973A (en) 1974-03-28

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