US3752141A - Vacuum controlled carburetor throttle valve positioner - Google Patents

Vacuum controlled carburetor throttle valve positioner Download PDF

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Publication number
US3752141A
US3752141A US00278673A US3752141DA US3752141A US 3752141 A US3752141 A US 3752141A US 00278673 A US00278673 A US 00278673A US 3752141D A US3752141D A US 3752141DA US 3752141 A US3752141 A US 3752141A
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United States
Prior art keywords
throttle valve
engine
plunger
vacuum
servo
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Expired - Lifetime
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US00278673A
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English (en)
Inventor
H Marcum
W Charron
R Harrison
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Ford Motor Co
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Ford Motor Co
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Publication of US3752141A publication Critical patent/US3752141A/en
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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
    • F02M3/062—Increasing idling speed by altering as a function of motor r.p.m. the throttle valve stop or the fuel conduit cross-section by means of pneumatic or hydraulic means
    • 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

  • VACUUM CONTROLLED CARBURETOR THROTTLE VALVE POSITIONER Inventors: William W. Charron, Orchard Lake; I Robert S. Harrison, Detroit; Harold E. Mal-cum, Dearbom, all of Mich.
  • ABSTRACT A downdraft type carburetor in one embodiment has an idle system discharge port that is straddled by the normal 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; a second embodiment has a conventional idle system including a transfer port cooperating with the edge of the throttle valve to provide normal idle speed fuel and air flow while reducing the idle system fuel flow in the closed position of the throttle valve; both embodiments have a third beyond normal idle, or fast idle speed position provided for engine startup; the three positions are controlled 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 return the throttle valve to a normal idle position upon release of the vehicle accelerator pedal during engine operation.
  • 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 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 (1): permits closing of the throttle valve upon engine shutdown to either shut off all fuel and air flow or reduce the fuel flow to a level below that which will sustain engine running; 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.
  • Temperature responsive delay means is also provided to control the movement of the throttle valve at times.
  • 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. 2 shows a modification
  • FIG. 1 illustrates a portion 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 dotted 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. 2 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. I.
  • FIG. 2 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.
  • 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 position 36' indicates the idle speed position of the throttle valve, and the position 37 the fast idle engine start position.
  • a lever or link 38 is fixed on or formed integral with the 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 to its closed position 34.
  • Lever 38 is adapted to be moved clockwise to the right, as seen in FIG. 1, 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 consists of a sleeve type annular housing 44, closed at opposite ends by caps 46 and 48.
  • the housing further has a central partition 50 dividing it into two chambers.
  • a pair of annular flexible diaphragms 52 and 54 further subdivide the respective chambers into a pair of remote air chambers 56 and 58 and a pair of back-to-back vacuum chambers 60 and 62. Chambers 56 and 58 communicate with the atmosphere through holes 64 and 66 in caps 46 and 48 respectively.
  • diaphragms 52 and 54 are sealingly mounted to the housing 44 as shown between washers 68, 70 and the caps 46 and 48.
  • a first plunger 72 is fixed to diaphragm 52 for movement thereof or therewith by means of a pair of back-to-back retainers 74 riveted or otherwise fixed to diaphragm 52.
  • plunger 72 projects slidingly through a hole 75 in partition 50 and a rubber boot type seal 76 frictionally mounted on it.
  • a second plunger 78 is secured to diaphragm 54 in essentially the same manner as plunger 72; that is, fixed to a pair of retainers 80 riveted to diaphragm 54.
  • a compression spring 82 is seated between one retainer 80 and a combination seat and seal positioner 84. The inner edge of 84 holds the upturned flange 86 of boot seal 76 against partition 50.
  • Spring 82 normally biases the diaphragm 54 and plunger 78 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.
  • Vacuum chamber 60 is connected to engine intake manifold vacuum through a conduit 88 connected to a carburetor induction passage port 90 located beneath the throttle valve.
  • the line 88 could of course be tapped directly into the intake manifold further down from port 90, if desired.
  • Vacuum chamber 62 is connected to a vacuum reservoir 92 through a pipe 94, and its only connection to vacuum chamber 60 is by way of an orifice or flow restriction 96 in partition 49.
  • the aperture defining the restriction in this case, contains a temperature sensitive member 98 having an orifice 100.
  • the member 98 consists of a block of thermally sensitive material that is expandable and contractible in response to changes in ambient temperature to decrease or increase, respectively, the area of orifice 100. This in turn controls the time for equalization of vacuum levels between chambers 60 and 62 as a function of temperature changes.
  • 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 stop (plunger 72) to which the throttle valve is returned after start and during deceleration operation; and, thirdly, an antidieseling position in which the plunger 72 is retracted upon engine shut-off to permit full closure of the throttle valve, followed by return to the engine start, fast idle position after a slight delay.
  • the parts are shown in FIG. 1 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.
  • the force of spring 82 would be chosen to be greater than that of return spring 40 so that in its rightwardly extended position, plunger 78 will rotate throttle valve to the fast idle position 37.
  • the servo spring 82 therefore, has positioned the diaphragm retainer against the housing cap 48.
  • Manifold vacuum then leaking through orifice 100 permits atmospheric pressure in chamber 58 and spring 40 to push diaphragm 54 and-plunger 78 against spring 82 until it is stopped by the end of plunger 72. This corresponds to the curb idle speed position 36 of the throttle valve. As soon as the throttle valve is moved by the operator to an open, off-idle position, beyond the start position, the spring 82 can now move the plunger 78 back to a start position away from plunger 72.
  • the manifold vacuum in chamber 60 will quickly decay to zero. This permits plunger 72 to be positioned to any location pushed. Since communication between vacuum chambers 60 and 67, however, is still only by way of orifice 100, the vacuum in reservoir 92, together with spring 40, is sufficient to pull plunger 78 leftwardly against plunger 72 until plunger 78 is moved to pennit a full closure of the throttle valve to the antLdieseling position. After a few seconds, the decay in vacuum in reservoir 92, by bleed of vacuum through orifice 100, will then permit spring 82 to reposition the plunger 78 to the right to the start position originally described, locating the throttle valve at the fast idle position 37.
  • the invention provides a throttle valve positioner that during normal engine operation permits a normal engine idle speed position; and yet also reduces fuel flow or completely shuts off all flow of fuel and air to the engine to prevent 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 the 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 the passage, and control means to move the throttle valve to and' between its positions, the control means comprising power means having a first plunger operatively adapted to engage or be engaged by the throttle valve for moving the same or restricting the movement thereof, respectively, spring means acting on and biasing the first plunger to a first position urging the throttle valve to an open beyond engine normal idle speed position conditioning the engine for a hot start leaner fuel/air ratio, first engine intake manifold vacuum responsive servo means operatively acting
  • 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 the 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 the passage, and control means to move the throttle valve to and between its positions, the throttle valve having linkage means secured thereto, the control means including first and second vacuum servos in back-to-back relationship with axially aligned actuators adapted to contact and move or restrict movement of each other at times, the first actuator being freely movable and the second actuator being spring biased towards the throttle 'valve linkage means, conduit means connecting engine intake manifold vacuum to the first vacuum servo for moving the first plunger toward
  • 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 the 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 the passage, and control means to move the throttle valve to and between its positions, the control means including a servo, the servo having a hollow shell with a partition dividing the shell into two chambers each of which is subdivided into an air and vacuum chamber by an annular flexible diaphragm, means connecting the first plunger to a first diaphragm and the second plunger to the second diaphragm, the plungers being axially aligned with the second plunger projecting

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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)
US00278673A 1972-08-07 1972-08-07 Vacuum controlled carburetor throttle valve positioner Expired - Lifetime US3752141A (en)

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US27867372A 1972-08-07 1972-08-07

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US (1) US3752141A (enrdf_load_stackoverflow)
JP (1) JPS534571B2 (enrdf_load_stackoverflow)
AU (1) AU5592173A (enrdf_load_stackoverflow)
GB (1) GB1389155A (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805760A (en) * 1972-11-27 1974-04-23 Honda Motor Co Ltd Run-on prevention device for internal combustion engines
US4022179A (en) * 1975-12-29 1977-05-10 Acf Industries, Incorporated Vacuum controlled throttle positioner and dashpot
US4059088A (en) * 1974-05-28 1977-11-22 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
US4095567A (en) * 1975-06-26 1978-06-20 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburation devices with idle adjustment
US4168681A (en) * 1977-03-25 1979-09-25 Toyota Jidosha Kogyo Kabushiki Kaisha Butterfly valve opening degree setting device
US4177224A (en) * 1977-04-25 1979-12-04 Aisin Seiki Kabushiki Kaisha Altitude compensation valve
US4177784A (en) * 1976-12-21 1979-12-11 Toyo Kogyo Co., Ltd. Engine starting device
US4230077A (en) * 1977-08-25 1980-10-28 Hitachi, Ltd. Vacuum operated servo
USRE30844E (en) * 1972-11-27 1982-01-12 Honda Giken Kogyo Kabushiki Kaisha Run-on prevention device for internal combustion engines
US4343277A (en) * 1979-07-20 1982-08-10 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle valve opening controller
US4463716A (en) * 1982-09-20 1984-08-07 Tom Mcguane Industries, Inc. Throttle positioning device
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
US5235943A (en) * 1992-06-12 1993-08-17 Briggs & Stratton Corporation Starting system for internal combustion engines
US5827335A (en) * 1995-11-07 1998-10-27 Pioneer/Eclipse Corporation Enhanced performance carburetor system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54128249U (enrdf_load_stackoverflow) * 1978-02-16 1979-09-06
JPS58116533U (ja) * 1982-01-30 1983-08-09 いすゞ自動車株式会社 積段型パレツト
JPH01132522U (enrdf_load_stackoverflow) * 1988-02-17 1989-09-08
JPH0353429U (enrdf_load_stackoverflow) * 1989-09-26 1991-05-23

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805760A (en) * 1972-11-27 1974-04-23 Honda Motor Co Ltd Run-on prevention device for internal combustion engines
USRE30844E (en) * 1972-11-27 1982-01-12 Honda Giken Kogyo Kabushiki Kaisha Run-on prevention device for internal combustion engines
US4059088A (en) * 1974-05-28 1977-11-22 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle positioner
US4095567A (en) * 1975-06-26 1978-06-20 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburation devices with idle adjustment
US4022179A (en) * 1975-12-29 1977-05-10 Acf Industries, Incorporated Vacuum controlled throttle positioner and dashpot
US4177784A (en) * 1976-12-21 1979-12-11 Toyo Kogyo Co., Ltd. Engine starting device
US4168681A (en) * 1977-03-25 1979-09-25 Toyota Jidosha Kogyo Kabushiki Kaisha Butterfly valve opening degree setting device
US4177224A (en) * 1977-04-25 1979-12-04 Aisin Seiki Kabushiki Kaisha Altitude compensation valve
US4230077A (en) * 1977-08-25 1980-10-28 Hitachi, Ltd. Vacuum operated servo
US4343277A (en) * 1979-07-20 1982-08-10 Toyota Jidosha Kogyo Kabushiki Kaisha Throttle valve opening controller
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
US5235943A (en) * 1992-06-12 1993-08-17 Briggs & Stratton Corporation Starting system for internal combustion engines
US5827335A (en) * 1995-11-07 1998-10-27 Pioneer/Eclipse Corporation Enhanced performance carburetor system

Also Published As

Publication number Publication date
JPS534571B2 (enrdf_load_stackoverflow) 1978-02-18
AU5592173A (en) 1974-11-21
GB1389155A (en) 1975-04-03
JPS4951423A (enrdf_load_stackoverflow) 1974-05-18

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