US3682148A - Carburetor throttle valve positioner - Google Patents

Carburetor throttle valve positioner Download PDF

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Publication number
US3682148A
US3682148A US120953A US3682148DA US3682148A US 3682148 A US3682148 A US 3682148A US 120953 A US120953 A US 120953A US 3682148D A US3682148D A US 3682148DA US 3682148 A US3682148 A US 3682148A
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US
United States
Prior art keywords
vacuum
throttle valve
engine
throttle
servo
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
US120953A
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English (en)
Inventor
Robert S Harrison
Max W 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
Application granted granted Critical
Publication of US3682148A publication Critical patent/US3682148A/en
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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
    • F02M3/00—Idling devices for carburettors
    • F02M3/02—Preventing flow of idling fuel
    • F02M3/04—Preventing flow of idling fuel under conditions where engine is driven instead of driving, e.g. driven by vehicle running down hill
    • 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
    • F02M3/06—Increasing idling speed
    • F02M3/07—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
    • 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
    • Y10S123/00—Internal-combustion engines
    • Y10S123/11—Antidieseling

Definitions

  • a downdraft type carburetor has an idle system discharge port that is straddled by the idle speed and closed throttle positions of the throttle valve so as to permit idle speed fuel and air flow in one position and no flow in the other position; the two positions being controlled by a servo operatively engaging the throttle valve; the servo operation being controlled by intake manifold vacuum during engine deceleration operation to close the throttle valve, or upon engine shut off interrupting the ignition circuit to close the throttle valve with a subsequent return of the throttle valve to its curb idle position for engine restarting.
  • This invention relates, in general, to means for positioning the throttle valve of a carburetor to minimize the emission of undesirable elements into the ammosphere. More particularly, it relates to a vacuum and electrically controlled servo to shut off fuel and air flow through a carburetor after engine shutdown and during engine deceleration operating conditions to prevent engine dieseling and minimize the passage of unburned hydrocarbons into the atmosphere.
  • This invention provides a carburetor throttle valve construction that permits a full closing of the throttle valve to shut off all fuel and air flow, or alternatively, a curb idle position for normally maintaining the engine at idling speed.
  • An electrical circuit including the engine ignition key includes a valve to normally block the flow of manifold vacuum to a valve positioning servo so that the throttle valve normally remains in its curb idle position when not depressed.
  • the latter valve opens to permit vacuum from a vacuum reservoir to actuate the servo and permit the throttle valve to fully close to thereby shut off all flow of fuel and air to the engine cylinders.
  • the vacuum actuates a switch to break the ignition circuit and thereby again permit the servo to fully close the throttle valve.
  • the carburetor idle system In the prior art devices, the carburetor idle system generally discharged the fuel/air mixture into the induction passage at a point located below the closed or at-rest position of the throttle valve so that no matter how closed the throttle valve was, it was possible to obtain fuel flow into the engine cylinders via the idle system. Accordingly, the problems described above as to dieseling and deceleration operating conditions sucking additional fuel and air into the engine compart ment existed even though the throttle valve may have fully closed at times.
  • the invention provides a construction in which the idle system discharge port is straddled by the throttle valve in its fully closed and engine idle speed positions so that when the throttle valve is positioned for normal idle speed operation, idle fuel and air flow can be obtained in the conventional manner; however, when the throttle valve is moved to its fully closed position, all fuel and air flow is terminated.
  • the invention provides suitable apparatus for moving the throttle valve to its various positions to prevent engine dieseling and the emission of unburned hydrocarbons into the exhaust system during engine decelerating operating conditions.
  • FIGURE illustrates a portion 10 of a downdraft type carburetor, although it will be clear as the description proceeds that the invention is equally applicable to other types of carburetors such as updraft or sidedraft, for example.
  • the carburetor is provided with a main body portion 112 having a cylindrical bore 14 providing the conventional and/fuel induction passage 16.
  • the latter is open at its upper end 18 to air at essentially atmospheric pressure passing through the conventional air cleaner, not shown.
  • passage 16 is adapted to be connected to a conventional intake manifold, from which the air and fuel mixture passes to the engine cylinders, not shown, in a known manner.
  • the flow of air and fuel through induction passage 16 is controlled in this instance by a conventional throttle valve 22.
  • the latter is rotatably mounted on a shaft 24 fixed for rotation in the side walls of body 12, in a known manner.
  • a main fuel system is not shown, since it can be any of many known types.
  • the fuel would be inducted into passage 16 above the throttle valve in a known manner as a function of the rotation of the valve from its fully closed dotted line position 34 to its wide open nearly vertical position, by the change in vacuum si al.
  • the carburetor also contains an idle system for supplying the necessary fuel and air to the engine cylinders during engine idling speed operation.
  • This air and fuel is provided through the bypass passage 26 past an adjustable needle valve 28 and through an orificed discharge port 30 in an insert 32 into induction passage
  • the discharge end of the idle system is located so as to be straddled by the throttle valve between its fully closed dotted line position 34 and its curb idle or engine idle speed setting 36 shown in full lines. It will be clear that in the fully closed position 34, the vacuum existing below the throttle valve is cut off from the idle passage 26 and therefore no fuel or air will flow at this time as passage 26 is at ambient or atmospheric pressure at both ends.
  • a lever or link 38 is fixed on or formed integral with the throttle valve shaft 24 for rotation with it, a tension spring 40 biasing lever 38 in a clockwise direction at all times to bias the throttle valve to its closed position 34.
  • the lever 38 is adapted to be moved to the right, as seen in the Figure, to rotate the throttle valve counterclockwise to its engine idle speed position 36 by a servo 42.
  • the latter includes a shell type housing 44 divided into an atmospheric pressure chamber 46 and a vacuum chamber 48 by an annular flexible diaphragm 50.
  • a vacuum line 56 opens into chamber 48.
  • a stem type actuator 52 is secured to diaphragm 50 and is normally biased against the end of lever 38 by means of a spring 54.
  • the force of spring 54 is chosen to be greater than that of return spring 40 so that in its extended position, rod 52 will rotate the throttle valve to the curb idle speed position 36 shown. Manifold vacuum applied to servo chamber 48 on the other hand will retract the rod 52 sufficient to allow spring 40 to rotate the throttle valve 22 to its dotted line fully closed position 34.
  • the vacuum to line 56 emanates from an intake manifold vacuum port 60 shown opening into the carburetor body portion 12 below the throttle valve. It could equally be tapped directly into the intake manifold portion 20.
  • the intake manifold vacuum is sensed in a line 62 through a restriction or orifice 64 to a vacuum reservoir or accumulator indicated schematically at 66.
  • the orifice 64 prevents momentary fluctuations in the manifold vacuum from affecting the level of vacuum in the reservoir 66. More importantly, it prevents a sudden decay in the manifold vacuum from equally suddenly decaying the vacuum in the reservoir 66.
  • valve 68 The passage of vacuum from reservoir 66 to servo line 56 is controlled by a spring opened, electrically closed, valve 68 of the of on-off type. More specifically, the valve body is shown provided with intersecting passages 67, 56 into which projects the cone-shaped end 70 of a shuttle valve. A spring 71 normally unseats the valve to open passage 67 to passage 56 to allow vacuum to be applied to the servo to fully close the throttle valve.
  • Valve 68 also forms part of the conventional engine ignition circuit.
  • the latter includes a known type of igniton key operated switch 72 bridging or breaking the circuit from a battery 74 to the coil 76 of a solenoid or similar suitable type device of which valve 68 is a part.
  • valve in this case can be the armature of a solenoid so that when the coil 76 is energized, valve 68 will be forced rightwardly against the force of spring 71 to seat the valve and fully close off the passage 56.
  • the electrical circuit to valve 68 also includes a manifold vacuum controlled switch 80 adapted to make or break the circuit from the ignition switch 72 to valve 68 as a function of the level of manifold vacuum below the throttle valve. More particularly, the switch 80 includes a plunger 82 biased to the left to bridge the contacts 84 of the switch by a spring 86. The latter operates in a chamber 88 connected by a bore 90 to a manifold vacuum line 92 branched off intake manifold vacuum port 60.
  • the spring 86 is chosen of a force sufficient to normally maintain the contacts 84 bridged so long as engine intake manifold vacuum is below a level of say, for example, 19 inches Hg. Above this level, the vacuum is indicative of the engine operating under deceleration operating conditions, at which point it is desirable to fully close the throttle valve to prevent the flow of further fueland air to the engine cylinders. Accordingly, it will be seen that above 19 inches I-lg., switch 82 will be moved rightwardly by vacuum to unbridge the contacts 84 and open the circuit from the ignition switch 72 to valve 68. This permits spring 71 to open the valve 68 and flow vacuum from reservoir 66 to the servo chamber 48 to fully close the throttle valve.
  • This delay of several seconds is sufficient to permit vacuum to be applied to the servo chamber 48 of a level sufficient to retract rod 52 and permit full closing of the throttle valve to shut off all fuel and air flow;
  • the time delay of bleeding of the vacuum in reservoir 66 is sufficient, therefore, to prevent dieseling of the engine upon engine shutdown.
  • servo chamber 48 will be at the same pressure level as chamber 46, and spring 54 will move the throttle valve to its engine idle or engine start position 36 shown.
  • the invention provides a throttle valve positioner that completely shuts off all flow of fuel and air to the engine during high engine decelerating operating conditions; prevents engine dieseling after the engine is shut off for a period of time sufficient to permit the engine to come to restj and yet repositions the throttle valve to an attitude providing engine starting.
  • a carburetor throttle valve positioner comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across said passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through said passage, an idle fuel/air mixture passage connected to said induction passage around said throttle valve and having a discharge end connected to said induction passage at a location above the closed throttle valve position but adapted to be traversed by the throttle valve as it moves towards an open position so that the idle passage is subjected to manifold vacuum when the throttle valve is positioned beyond the closed position to provide normal idle and off-idle speed mixture flow and subjected to ambient pressure level during closed throttle valve position to terminate idle mixture flow, and control
  • said power means including a vacuum servo having a spring extended, vacuum retracted, piston rod in its extended position operatively engaging and moving said throttle valve to said engine starting position, and in its retracted position pemiitting said second means to close said throttle valve, said vacuum means operatively acting on said rod to retract said rod in response to engine shutdown.
  • said power means including a vacuum servo, conduit means connecting said servo to said intake manifold servo, conduit means connecting said servo to said intake manifold vacuum, on-off valve means in said conduit means spring biased to an on position in response to engine shutdown to connect vacuum to said servo to close said throttle valve, and a vacuum reservoir in said conduit means for maintaining a vacuum on said servo of a level sufficient to close said throttle valve for a predetermined period after decay of the intake manifold vacuum until the decay in vacuum in said reservoir permits said first means to bias said throttle valve to said open position.
  • a throttle positioner as in claim 4 including engine ignition means including an ignition switch and an electrical circuit operably connecting said switch to said on-off valve for effecting movement of the same to an off position upon closing of said switch to effect engine start-up to block the flow of said vacuum to said servo.
  • said on-off valve including spring means biasing said latter valve to an on position permitting application of vacuum to said servo, said latter valve including electrical means energized in response to closing of said ignition switch to move said latter valve to an off position blocking application of vacuum to said servo.

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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 Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US120953A 1971-03-04 1971-03-04 Carburetor throttle valve positioner Expired - Lifetime US3682148A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12095371A 1971-03-04 1971-03-04

Publications (1)

Publication Number Publication Date
US3682148A true US3682148A (en) 1972-08-08

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US120953A Expired - Lifetime US3682148A (en) 1971-03-04 1971-03-04 Carburetor throttle valve positioner

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US (1) US3682148A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AU (1) AU454367B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA950293A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2207594A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1356799A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736915A (en) * 1971-11-29 1973-06-05 Ford Motor Co Carburetor emission control device
US3752450A (en) * 1971-07-26 1973-08-14 Ford Motor Co Vacuum controlled carburetor throttle valve positioner
US3788288A (en) * 1971-03-04 1974-01-29 Ford Motor Co Carburetor throttle valve positioner
US3792696A (en) * 1972-02-14 1974-02-19 Hollins J R Combustion engine throttle control
US3800759A (en) * 1971-12-27 1974-04-02 Ford Motor Co Temperature sensitive anti-dieseling control
US3805760A (en) * 1972-11-27 1974-04-23 Honda Motor Co Ltd Run-on prevention device for internal combustion engines
US3847131A (en) * 1972-06-06 1974-11-12 Nissan Motor Throttle operating mechanism for carburetor
US4059088A (en) * 1974-05-28 1977-11-22 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
FR2485094A1 (fr) * 1980-06-20 1981-12-24 Bosch Pierburg System Ohg Appareillage limitant la fermeture du papillon d'un carburateur en fonction de la vitesse du moteur
USRE30844E (en) * 1972-11-27 1982-01-12 Honda Giken Kogyo Kabushiki Kaisha Run-on prevention device for internal combustion engines
US4462355A (en) * 1982-03-24 1984-07-31 Honda Giken Kogyo Kabushiki Kaisha Throttle valve control apparatus for internal combustion engine
US4481923A (en) * 1982-03-17 1984-11-13 Honda Giken Kogyo Kabushiki Kaisha Throttle valve control apparatus in internal combustion engine
US4510901A (en) * 1982-03-17 1985-04-16 Honda Giken Kogyo Kabushiki Kaisha Throttle valve control apparatus
US4532900A (en) * 1982-03-24 1985-08-06 Honda Giken Kogyo Kabushiki Kaisha Deceleration control apparatus for a multi-cylinder internal combustion engine
US20130087111A1 (en) * 2011-10-06 2013-04-11 GM Global Technology Operations LLC Internal combustion engine and method for control
US20140158093A1 (en) * 2012-07-09 2014-06-12 James M. Cleeves Deceleration fuel shut off for carbureted engines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3337260A1 (de) * 1983-10-13 1985-04-25 Atlas Fahrzeugtechnik GmbH, 5980 Werdohl Leerlaufregelung fuer einen ottomotor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3354877A (en) * 1966-03-25 1967-11-28 Acf Ind Inc Means for preventing auto ignition at engine shut down
US3547088A (en) * 1968-04-03 1970-12-15 Honda Motor Co Ltd Engine-brake intensifying device for spark-ignition type internal-combustion engines with an air-pollution preventive system
US3561412A (en) * 1968-04-04 1971-02-09 Honda Motor Co Ltd Control apparatus in an engine suction conduit to prevent increase in the fuel-air ratio due to adhered fuel on the conduit walls
US3603297A (en) * 1969-10-01 1971-09-07 Harry A Sherwin Throttle control
US3618582A (en) * 1969-12-04 1971-11-09 F & E Mfg Co Throttle control system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3354877A (en) * 1966-03-25 1967-11-28 Acf Ind Inc Means for preventing auto ignition at engine shut down
US3547088A (en) * 1968-04-03 1970-12-15 Honda Motor Co Ltd Engine-brake intensifying device for spark-ignition type internal-combustion engines with an air-pollution preventive system
US3561412A (en) * 1968-04-04 1971-02-09 Honda Motor Co Ltd Control apparatus in an engine suction conduit to prevent increase in the fuel-air ratio due to adhered fuel on the conduit walls
US3603297A (en) * 1969-10-01 1971-09-07 Harry A Sherwin Throttle control
US3618582A (en) * 1969-12-04 1971-11-09 F & E Mfg Co Throttle control system

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788288A (en) * 1971-03-04 1974-01-29 Ford Motor Co Carburetor throttle valve positioner
US3752450A (en) * 1971-07-26 1973-08-14 Ford Motor Co Vacuum controlled carburetor throttle valve positioner
US3736915A (en) * 1971-11-29 1973-06-05 Ford Motor Co Carburetor emission control device
US3800759A (en) * 1971-12-27 1974-04-02 Ford Motor Co Temperature sensitive anti-dieseling control
US3792696A (en) * 1972-02-14 1974-02-19 Hollins J R Combustion engine throttle control
US3847131A (en) * 1972-06-06 1974-11-12 Nissan Motor Throttle operating mechanism for carburetor
USRE30844E (en) * 1972-11-27 1982-01-12 Honda Giken Kogyo Kabushiki Kaisha Run-on prevention device for internal combustion engines
US3805760A (en) * 1972-11-27 1974-04-23 Honda Motor Co Ltd Run-on prevention device for internal combustion engines
US4059088A (en) * 1974-05-28 1977-11-22 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
FR2485094A1 (fr) * 1980-06-20 1981-12-24 Bosch Pierburg System Ohg Appareillage limitant la fermeture du papillon d'un carburateur en fonction de la vitesse du moteur
US4481923A (en) * 1982-03-17 1984-11-13 Honda Giken Kogyo Kabushiki Kaisha Throttle valve control apparatus in internal combustion engine
US4510901A (en) * 1982-03-17 1985-04-16 Honda Giken Kogyo Kabushiki Kaisha Throttle valve control apparatus
US4462355A (en) * 1982-03-24 1984-07-31 Honda Giken Kogyo Kabushiki Kaisha Throttle valve control apparatus for internal combustion engine
US4532900A (en) * 1982-03-24 1985-08-06 Honda Giken Kogyo Kabushiki Kaisha Deceleration control apparatus for a multi-cylinder internal combustion engine
US20130087111A1 (en) * 2011-10-06 2013-04-11 GM Global Technology Operations LLC Internal combustion engine and method for control
US8443784B2 (en) * 2011-10-06 2013-05-21 GM Global Technology Operations LLC Internal combustion engine and method for control
US20140158093A1 (en) * 2012-07-09 2014-06-12 James M. Cleeves Deceleration fuel shut off for carbureted engines
US9243578B2 (en) * 2012-07-09 2016-01-26 Pinnacle Engines, Inc. Deceleration fuel shut off for carbureted engines

Also Published As

Publication number Publication date
DE2207594B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1980-02-28
DE2207594A1 (de) 1973-08-02
GB1356799A (en) 1974-06-19
CA950293A (en) 1974-07-02
AU3516771A (en) 1973-05-03
AU454367B2 (en) 1974-10-31

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