US3760785A - Carburetor throttle valve positioner - Google Patents

Carburetor throttle valve positioner Download PDF

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Publication number
US3760785A
US3760785A US00278674A US3760785DA US3760785A US 3760785 A US3760785 A US 3760785A US 00278674 A US00278674 A US 00278674A US 3760785D A US3760785D A US 3760785DA US 3760785 A US3760785 A US 3760785A
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United States
Prior art keywords
engine
throttle valve
idle
vacuum
normal
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Expired - Lifetime
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US00278674A
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English (en)
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R Harrison
H Marcum
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Ford Motor Co
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Ford Motor Co
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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
    • 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
    • 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
    • Y10S261/19—Degassers

Definitions

  • ABSTRACT One embodiment of a downdraft type carburetor has [73] Assignee: Ford Motor Company,
  • a conventional idle system with a transfer port cooperating with the edge of the throttle valve so as to permit normal idle speed fuel and air flow in one position and a less combustible mixture flow in a second position, as well as a third beyond normal idle engine hot start position;
  • the three positions of each embodiment are controled by a servo operatively engaging the throttle valve;
  • the servo operation is controlled by intake manifold vacuum to initially close the throttle valve upon engine shut off, with a subsequent return of the throttle valve to its fast idle position for engine restarting, or to References Cited UNITED STATES PATENTS return the throttle valve to a normal idle position upon release of the vehicle accelerator pedal during engine 3,618,582 Gerlitz.... 3,491,737 1/1970 Burnia.... 3,603,297 9/1971 Sherwin.................
  • This invention relates, in general, to means for controlling the movement of the throttle valve of'a carburetor. More particularly, it relates to a vacuum and electrically controlled power means to control fuel and air flow through a carburetor to prevent engine dieseling and minimize the passage of unburned hydrocarbons into the atmosphere.
  • This invention provides a carburetor throttle valve construction that l depending upon the embodiment, permits a full closing of the throttle valve upon engine shutdown either to reduce the fuel flow to a level not sustaining engine operation, or shut off all fuel and air flow; or (2) a curb idle position for normally maintaining the engine at a normal idling speed; or (3) a faster idle position for the leaner start of a hot engine.
  • Throttle return delay means is also provided to only slowly close the throttle valve during engine deceleration, to dry out the throttle bore.
  • the invention in one embodiment 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.
  • a conventional idle system is provided, and the edge of the throttle valve cooperates with a transfer port such that when the throttle valve is moved to a fully closed position, the idle channel signal is bled to reduce idle system fuel flow below a level that will sustain the engine running.
  • 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, while at the same time providing good starting.
  • FIG. 1 shows a cross-sectional view of a portion of a carburetor embodying the invention
  • FIG. la is a cross-sectional view of a modification
  • FIG. 2 is a cross-sectional view taken on a plane indicated by and viewed in the direction of the arrows 2-2 of FIG. 1;
  • FIG. 3 is a cross-sectional view of a modification.
  • FIG. 1 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 12 having a cylindrical bore 14 containing the conventional venturi, not shown, in an air/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 an engine 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 full line position shown to its wide open nearly vertical position, by the change in vacuum signal.
  • 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 into induction passage 16.
  • the discharge end of the idle system is located so as to be straddled by the throttle valve between its fully closed 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. It will also be seen that when the throttle valve is positioned in its normal idle speed position 36, the discharge orifice 30 is subjected to the vacuum signal below the throttle valve so as to cause the desired amount of fuel and air to pass through the idle system to maintain the engine at the preset idling speed. A further fast idle or beyond normal idle position 37 is provided for hot engine starting purposes, as will be explained more clearly later.
  • FIG. la shows an alternative arrangement in which the invention is adapted for use with a conventional idle system.
  • the fuel flow is reduced below a level sustaining engine operation, upon engine shutdown, as opposed to completely shutting off flow as described in connection with FIG. 1.
  • FIG. 1a shows a conventional idle system for supplying the necessary fuel and air to the engine cylinders around the throttle valve during engine idling and off idle speed operation.
  • a bypass passage or channel 26 contains the usual transfer port 27 and a discharge port 30' controlled by an adjustable needle valve 28'.
  • the transfer port 27 is located so that its lower edge is aligned with the edge of the throttle valve plate in its closed full line position 34'. Alternatively, if desired, the transfer port can be located vertically in other positions relative to the throttle plate edge when the latter is in the closed position.
  • the dotted line positions 36' and 37' indicate respectively the idle speed and fast idle speed positions of the throttle valve.
  • a lever or link 38 is fixed on or formed integral with throttle valve shaft 24, 24' for rotation with it, a tension spring 40 biasing lever 38 in a clockwise direction at all times to bias the throttle valve t its closed position 34, 34'.
  • Lever 38 is adapted to be moved clockwise to the right, as seen in FIGS. 1 and la, to rotate the throttle valve clockwise to its normal idle speed position 36, or to the fast engine idle speed position 37, by a servo 42.
  • the latter includes an open shell type housing 44 closed by a stepped diameter cover 45.
  • a flexible annular diaphragm 46 is secured between the housing and cover and extends across the hollow interior defined between the two to divide it into an atmospheric pressure chamber 48 and a vacuum chamber 50.
  • a vacuum line 52 opens into chamber 50, while chamber 48 communicates with the atmosphere through holes 54 in cover 45.
  • first plunger 60 Fixedly secured to diaphragm 46 by a pair of retainers 56 and 58 is a first plunger 60 having a central bore or passage 62.
  • a second nylon plunger 64 has a central recess 66 that permits it to be mounted over plunger 60 in a telescopically slidable manner.
  • An internal shoulder 65 on plunger 64 prevents total separation of the plungers, but permits sliding to provide the clearance shown.
  • the end of plunger 64 extends slidable through an opening 67 formed in cover 45.
  • a light spring 68 biases the two plungers 60 and 64 apart to the extreme position shown.
  • Plunger 64 is hatshaped in cross section for the attachment thereto, by any suitable means, of an annular screen-type collapsible dirt filter 70.
  • An O-ring type seal 74 is installed in the end of recess 66 for the seating at times of it against the adjacent end of plunger 60, by the throttle return spring 40.
  • Plunger 64 as best seen in FIG. 2, has a number of slotted or fluted portions 76 providing air passages 78 connecting the air holes 54 and plunger passage 62 when plunger 60 is not against O-ring seal 74.
  • Servo chamber 50 is formed to contain one end of a main spring 80 seated at its opposite end against diaphragm retainer 56.
  • the spring normally biases the diaphragm and both plungers 60 and 64 to the right to contact link 38, if the vehicle accelerator pedal is not depressed and the engine inoperative, to force throttle valve 22 to the fast idle, engine start position 37. More fuel vapor exists with a hot engine. Therefore, a greater throttle valve opening provides more air flow to produce the desired starting air/fuel ratio.
  • a solenoid 82 is adjustably mounted in housing 44, and has an armature 84 movable between the full line position shown and the dotted line position, as a function of the operativeness or inoperativeness of the engine. That is, the operation of the solenoid is adapted to be tied in with the engine ignition system, not shown, so that when the ignition key is turned on, for example, an electrical connection is made to solenoid 82 to energize the same and move armature 84 to the dotted line position 86.
  • deenergization of solenoid 82 causes armature 84 to be retracted by a conventional spring, not shown, to the full line position shown.
  • the above described circuit could be similar to that shown and fully described in Ser. No. 120,953, Carburetor Throttle Valve Positioner, Robert S. Harrison and Max W. Lunsford. It could include, for example, a known type of ignition key operated switch bridging or breaking the circuit from a battery to the coil of solenoid 82. When the coil is energized, armatur'e 84 would be forced rightwardly against the force of a spring to move the armature to the position 86.
  • solenoid armature 84 stops the movement of plunger 60 in a leftward direction at a point corresponding to the normal idle speed position 36 of throttle valve 22.
  • the full line position of armature 84 permits the plungers 60 and 64 to move leftwardly to the fully closed position 34 of the throttle valve.
  • the force of spring 80 would be chosen to be greater than that of return spring 40 so that in its rightwardly extended position, plunger 64 will rotate the throttle valve to the fast idle speed position 37 shown.
  • Manifold vacuum as will be explained, applied to servo chamber 50 on the other hand will retract the plungers 60 and 64 sufiicient to allow spring 40 to rotate the throttle valve 22 to its dotted line fully closed position 34.
  • the vacuum to line 52 emanates from an intake manifold vacuum port shown opening into the carburetor body portion 12 below the throttle valve. It could equally be tapped directly into the intake manifold portion below.
  • the intake manifold vacuum is sensed in a line 92 through a restriction or orifice 94 to a vacuum reservoir or accumulator (optional, as desired) 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.
  • FIG. 3 shows a modified construction in which only a single plunger 88 is used instead of the dual plunger arrangement of FIGS. 1 and 2.
  • the plunger is connected directly to diaphragm retainers 56 and 58. This eliminates the time delay function shown in FIGS. 1 and 2, which will 'be described now in connection with the operation of the invention.
  • the purpose of the throttle positioner is to provide three positions for emission control; namely, a starting position, in which the throttle valve is opened beyond idle'position to provide a leaner start of a hot engine and yet a good start of a colder engine; secondly, a curb idle position against a solenoid armature to which the throttle valve is returned after start and during deceleration operation; and, thirdly, an antidieseling position in which the solenoid armature is retracted upon engine shut-off to permit full closure of the throttle valve, with a subsequent return to the engine start, fast idle position after a slight delay.
  • FIGS. 1 and 3 differ only in that the FIG. 1 construction also contains a dash pot to delay the closing movement of the throttle.
  • the parts are shown in the engine-off condition positioned for a start operation.
  • the throttle valve spring 40 has returned the throttle valve link 38 against the end of plunger 64. This pushes plunger 64 against the end of plunger 60, collapsing filter 48 and seating 0- ring seal 74.
  • the main servo spring 80 has positioned the diaphragm retainer 58 against the housing cover 45, the light positioning spring 68 being overcome by the throttle return spring 40. This position corresponds to a hot start where the throttle valve is open beyond the normal idle position, to position 37.
  • the solenoid armature 84 is moved to the right to the curb idle position indicated at 86.
  • the initial vacuum buildup in the intake manifold acting through orifice 94 in the passage 92 into servo chamber 50 acts against diaphragm 46 to pull the same against the armature 84.
  • the throttle valve return spring 40 now pushes the throttle valve link 38 against plunger 64 and through the seal 74 plunger 60 to cause plunger 60 to follow the movement of diaphragm 46 to position the throttle valve at the curb idle position.
  • the holes 54 permit atmospheric air pressure to maintain the diaphragm 46 against the solenoid armature 84.
  • the plunger 60 being sealed against the seal 74 at this time prevents a bleed down of the vacuum.
  • the light spring 68 can now move the plunger 64 back to a position to unseat seal 74 from plunger 60. This permits a bleed down of vacuum from chamber 50 by air entering through holes 54, the filter 70, and the fluted passage 76 into the passages 78 and 62 past seal 74. This decays the vacuum in chamber 50 until spring 80 is able to move the diaphragm 46 against the housing 45 and spring 68 moves the plunger 64 outwardly to the free position indicated.
  • the solenoid armature 84 immediately will retract to the anti-dieseling position shown in full lines. Since the intake manifold vacuum is applied through 92 through a restriction or orifice 96, the vacuum remains in chamber 50 for approximately two seconds after engine shut-off, which is sufficient time to permit atmospheric pressure in chamber 48 to move the diaphragm 46 to the anti-dieseling position closing the throttle valve. After the two seconds, the atmospheric buildup in chamber 50 permits the spring to reposition plunger 60 to the right, and spring 68 will move plunger 64 to the right to locate throttle valve 22 for the hot start position 37.
  • FIG. 3 embodiment The operation of the FIG. 3 embodiment is essentially the same as the FIGS. 1 and 2 embodiment except that no time delay or dash pot action is provided upon a return movement of the throttle valve to a normal engine idle speed position.
  • manifold vacuum in chamber 50 will always hold diaphragm 46 against the armature 84 in a curb idle position, so long as the engine is running.
  • Throttle valve spring 40 will, accordingly, always return the link 38 and throttle valve 22 to the curb idle position, without a dashpot or time delay action.
  • the anti-dieseling operation is the same as described in connection with FIG. 1.
  • the invention provides a throttle valve positioner that during normal engine operation permits a normal engine idle speed position; and yet also shuts off all flow of fuel and air to the engine or reduces the idle system fuel flow and prevents engine dieseling after the engine is shut off, for a period of time sufficient to permit the engine to come to rest; and subsequently 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, and control means to move said throttle valve to and between said positions, said control means including first means operatively acting on and biasing said throttle valve to an open beyond normal engine idle throttle position, second engine manifold vacuum responsive means operatively acting on said first means permitting return movement at times of said throttle valve to a normal engine idle speedv position during operation of said engine, third movable stop means to prevent return movement of said throttle valve to a position less open than said normal idle position during operation of said engine, and means to withdraw
  • said fourth means comprising a solenoid movable upon engine startup to a position operatively preventing closing of said throttle valve beyond normal idle speed position, and movable in response to engine shutdown to a position permitting closure of said throttle valve.
  • a positioner as in claim 4 including time delay means associated with said servo to delay the return movement of said second means towards said stop means.

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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)
US00278674A 1972-08-07 1972-08-07 Carburetor throttle valve positioner Expired - Lifetime US3760785A (en)

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US27867472A 1972-08-07 1972-08-07

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DE (1) DE2339646A1 (ja)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895615A (en) * 1973-12-07 1975-07-22 Ford Motor Co Carburetor throttle valve positioner
US3906910A (en) * 1973-04-23 1975-09-23 Colt Ind Operating Corp Carburetor with feedback means and system
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
US3971356A (en) * 1975-09-09 1976-07-27 Acf Industries, Incorporated Solenoid-dashpot
US4022179A (en) * 1975-12-29 1977-05-10 Acf Industries, Incorporated Vacuum controlled throttle positioner and dashpot
US4050436A (en) * 1976-03-17 1977-09-27 Crabtree Roger A Idle system blocking means
US4059088A (en) * 1974-05-28 1977-11-22 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
US4067306A (en) * 1976-06-24 1978-01-10 Acf Industries, Incorporated Solenoid operated device to control curb idle position of throttle valve
US4079713A (en) * 1975-06-18 1978-03-21 Laprade Bernard Refinements to constant depression carburettors
US4086900A (en) * 1976-07-19 1978-05-02 Colt Industries Operating Corporation Variable position throttle stop and dashpot apparatus
US4168681A (en) * 1977-03-25 1979-09-25 Toyota Jidosha Kogyo Kabushiki Kaisha Butterfly valve opening degree setting device
US4230077A (en) * 1977-08-25 1980-10-28 Hitachi, Ltd. Vacuum operated servo
US4304201A (en) * 1980-06-10 1981-12-08 Cts Corporation Method and apparatus for step positioning an engine speed control
US4350053A (en) * 1980-09-05 1982-09-21 General Electric Company Fluid pressure actuating device
US4404941A (en) * 1980-03-11 1983-09-20 Nissan Motor Company Limited Electronic controlled carburetor
US4417553A (en) * 1981-01-05 1983-11-29 Toyota Jidosha Kogyo Kabushiki Kaisha Method and apparatus for controlling the idling speed of an engine wherein the amount of air provided to the engine is increased by a predetermined amount when the engine speed becomes equal to zero
US4442811A (en) * 1981-03-31 1984-04-17 Honda Giken Kogyo Kabushiki Kaisha Method and apparatus for expediting the starting of an internal combustion engine
US4449499A (en) * 1982-01-21 1984-05-22 Aisan Kogyo Kabushiki Kaisha Fuel injection system
US4463716A (en) * 1982-09-20 1984-08-07 Tom Mcguane Industries, Inc. Throttle positioning device
DE3327376A1 (de) * 1983-07-29 1985-02-07 Pierburg Gmbh & Co Kg, 4040 Neuss Verfahren und vorrichtung zur steuerung der stellung einer drosselklappe in ansaugrohr einer brennkraftmaschine
US4569321A (en) * 1982-02-22 1986-02-11 Weber S.P.A. Carburetor for internal combustion engines with electronically controlled elements capable of maintaining the idling speed of the engine at a constant level
US4919095A (en) * 1987-09-07 1990-04-24 Fuji Jukogyo Kabushiki Kaisha Dashpot for an internal combustion engine
US6499455B1 (en) 2001-09-10 2002-12-31 Ford Global Technologies, Inc. System and method for preventing exhaust gases from entering an intake manifold of an engine
US20040112333A1 (en) * 2002-12-12 2004-06-17 Robert Mitchell Governor stabilizer
US8726882B2 (en) 2010-03-16 2014-05-20 Briggs & Stratton Corporation Engine speed control system
US8910616B2 (en) 2011-04-21 2014-12-16 Briggs & Stratton Corporation Carburetor system for outdoor power equipment
US8915231B2 (en) 2010-03-16 2014-12-23 Briggs & Stratton Corporation Engine speed control system
US9316175B2 (en) 2010-03-16 2016-04-19 Briggs & Stratton Corporation Variable venturi and zero droop vacuum assist

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491737A (en) * 1968-03-22 1970-01-27 Ford Motor Co Throttle blade control mechanism for preventing engine dieseling
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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3491737A (en) * 1968-03-22 1970-01-27 Ford Motor Co Throttle blade control mechanism for preventing engine dieseling
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 (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906910A (en) * 1973-04-23 1975-09-23 Colt Ind Operating Corp Carburetor with feedback means and system
US3895615A (en) * 1973-12-07 1975-07-22 Ford Motor Co Carburetor throttle valve positioner
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
US4059088A (en) * 1974-05-28 1977-11-22 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
US4079713A (en) * 1975-06-18 1978-03-21 Laprade Bernard Refinements to constant depression carburettors
US3971356A (en) * 1975-09-09 1976-07-27 Acf Industries, Incorporated Solenoid-dashpot
US4022179A (en) * 1975-12-29 1977-05-10 Acf Industries, Incorporated Vacuum controlled throttle positioner and dashpot
US4050436A (en) * 1976-03-17 1977-09-27 Crabtree Roger A Idle system blocking means
US4067306A (en) * 1976-06-24 1978-01-10 Acf Industries, Incorporated Solenoid operated device to control curb idle position of throttle valve
US4086900A (en) * 1976-07-19 1978-05-02 Colt Industries Operating Corporation Variable position throttle stop and dashpot apparatus
US4168681A (en) * 1977-03-25 1979-09-25 Toyota Jidosha Kogyo Kabushiki Kaisha Butterfly valve opening degree setting device
US4230077A (en) * 1977-08-25 1980-10-28 Hitachi, Ltd. Vacuum operated servo
US4404941A (en) * 1980-03-11 1983-09-20 Nissan Motor Company Limited Electronic controlled carburetor
US4304201A (en) * 1980-06-10 1981-12-08 Cts Corporation Method and apparatus for step positioning an engine speed control
US4350053A (en) * 1980-09-05 1982-09-21 General Electric Company Fluid pressure actuating device
US4417553A (en) * 1981-01-05 1983-11-29 Toyota Jidosha Kogyo Kabushiki Kaisha Method and apparatus for controlling the idling speed of an engine wherein the amount of air provided to the engine is increased by a predetermined amount when the engine speed becomes equal to zero
US4442811A (en) * 1981-03-31 1984-04-17 Honda Giken Kogyo Kabushiki Kaisha Method and apparatus for expediting the starting of an internal combustion engine
US4449499A (en) * 1982-01-21 1984-05-22 Aisan Kogyo Kabushiki Kaisha Fuel injection system
US4569321A (en) * 1982-02-22 1986-02-11 Weber S.P.A. Carburetor for internal combustion engines with electronically controlled elements capable of maintaining the idling speed of the engine at a constant level
US4463716A (en) * 1982-09-20 1984-08-07 Tom Mcguane Industries, Inc. Throttle positioning device
DE3327376A1 (de) * 1983-07-29 1985-02-07 Pierburg Gmbh & Co Kg, 4040 Neuss Verfahren und vorrichtung zur steuerung der stellung einer drosselklappe in ansaugrohr einer brennkraftmaschine
US4919095A (en) * 1987-09-07 1990-04-24 Fuji Jukogyo Kabushiki Kaisha Dashpot for an internal combustion engine
US6499455B1 (en) 2001-09-10 2002-12-31 Ford Global Technologies, Inc. System and method for preventing exhaust gases from entering an intake manifold of an engine
US20040112333A1 (en) * 2002-12-12 2004-06-17 Robert Mitchell Governor stabilizer
US6983736B2 (en) 2002-12-12 2006-01-10 Briggs & Stratton Corporation Governor stabilizer
US8726882B2 (en) 2010-03-16 2014-05-20 Briggs & Stratton Corporation Engine speed control system
US8915231B2 (en) 2010-03-16 2014-12-23 Briggs & Stratton Corporation Engine speed control system
US9316175B2 (en) 2010-03-16 2016-04-19 Briggs & Stratton Corporation Variable venturi and zero droop vacuum assist
US8910616B2 (en) 2011-04-21 2014-12-16 Briggs & Stratton Corporation Carburetor system for outdoor power equipment
US9598828B2 (en) 2011-04-21 2017-03-21 Briggs & Stratton Corporation Snowthrower including power boost system

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Publication number Publication date
AU5592073A (en) 1974-11-21
DE2339646A1 (de) 1974-02-28
JPS4951424A (ja) 1974-05-18

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