US3741177A - Carburetor throttle valve positioner - Google Patents

Carburetor throttle valve positioner Download PDF

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Publication number
US3741177A
US3741177A US00194258A US3741177DA US3741177A US 3741177 A US3741177 A US 3741177A US 00194258 A US00194258 A US 00194258A US 3741177D A US3741177D A US 3741177DA US 3741177 A US3741177 A US 3741177A
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US
United States
Prior art keywords
plunger
throttle valve
engine
vacuum
positioner
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
US00194258A
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English (en)
Inventor
T Schultz
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Ford Motor Co
Original Assignee
Ford Motor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Application granted granted Critical
Publication of US3741177A publication Critical patent/US3741177A/en
Anticipated expiration legal-status Critical
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
    • F02M3/06—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

  • This invention relates, in general, to a device for positioning the throttle valve of a carburetor to minimize the emission of undesirable elements into the atmosphere. More particularly, it relates to a vacuum controlled servo to control 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, while at the same time position the throttle valve for an engine idling speed and good starting conditions.
  • the minimum flow and engine idle speed positions of the throttle valve usually are the same. Therefore, when the engine is shut off, the vacuum signal still present for a few seconds draws a sufficient charge of fuel/air mixture into the combustion chamber to maintain the engine running.
  • the invention eliminates the above problem by providing a servo to essentially close the throttle valve automatically upon engine shutdown; thereby reducing the charge of fuel/air mixture below the level needed to overcome the frictional resistance of the engine to sustain running.
  • the servo subsequently repositions the throttle valve to the engine start position, which in this case also corresponds to the engine idle speed position.
  • the prior art devices also generally made no provision for overcoming the induction of a large charge of fuel/air mixture during decelerating operation, when the vacuum signal on the dile system is very high. This often resulted in unburned hydrocarbons in the exhaust system.
  • the invention again overcomes the above problem by the servo described previously also automatically opening the throttle valve beyond idle speed position, in response to decelerating vacuum, so that the increased flow can better scavenge the combustion chambers of exhaust gases.
  • FIGURE illustrates schematically a portion of a carburetor embodying the invention.
  • a portion 10 of a downdraft type carburetor is illustrated, 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 providing the conventional 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 a conventional intake manifold, from which the air and fuel mixture passes to the engine cylinders, not shown, in a known manner.
  • a conventional throttle valve 22 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. Suffice it to say that the fuel would beinducted 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 a wide open nearly vertical position, by the change in vacuum signal.
  • the carburetor also contains a conventional idle system for supplying the necessary fuel and air to the engine cylinders around the throttle valve during engine idling speed operation.
  • a bypass passage 26 contains the usual transfer port 28 and a discharge port 30 controlled by an adjustable needle valve 32.
  • the transfer port 28 is located so that the lower edge is aligned with the edge of the throttle valve plate in its closed dotted line position 34.
  • the transfer port can be located vertically in other positions relative to the throttle plate edge when in the closed position.
  • the full line position 36 indicates the idle speed position of the throttle valve, while dotted line position 37 indicates a deceleration position, to be described more fully later.
  • 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 48 in a counterclockwise direction at all times to bias the throttle valve towards its closed position 34.
  • the lever 38 is adapted to be moved clockwise to the right, as seen in the FIGURE, by a servo 42 to rotate throttle valve 22 clockwise to its engine idle speed position 36.
  • the servo includes a shell type housing 44 divided into two vacuum chambers 46 and 48 by an annular flexible diaphragm 50. Vacuum lines 52 and 54 are connected to chambers 46 and 48.
  • a stem type actuator or plunger 56 is secured to one side of diaphragm 50, while a second stem member 58 is fixed to and projects from the diaphragm in the opposite direction. The end of stem 58 is piloted into a recess 60 in housing 44.
  • ' Plunger 56 has an axially adjustably mounted end portion 62 in this instance screwed to a smaller diameter portion 64 of the plunger.
  • Slidably surrounding portion 64 is a sleeve '66 that slidably but sealingly projects through a hole 68 in housing 44.
  • the axial length of sleeve 66 is less than the axial extend of reduced portion 64, to permit relative axial movement between the N10.
  • a first compression spring 70 is seated between a flange 72 of sleeve 66 and the diaphragm retainer 74. It normally biases sleeve 66 to the right against a pad 76 on housing 44, and the diaphragm 50 to the left until a shoulder on the plunger portion 62 is stopped by abutment against the end of sleeve 66, as shown.
  • a second weaker spring 78 biases the assembly consisting of diaphragm 50, spring 70, and sleeve 66, as a unit to the positions shown.
  • the force of spring 78 is chosen to be greater than that of return spring 40 so that in its extended position shown, plunger 56 rotates the throttle valve to the idle speed position 36 as shown. Vacuumapplied to servo chamber 46 on the other hand will retract plunger 56 sufficiently to allow spring 40 to rotate the throttle valve 22 to its dotted line closed position 34.
  • the vacuum to lines 52 and 54 enamates from an intake manifold vacuum port 80 shown opening into the carburetor body portion 12 belowthe throttle valve. It could equally be tapped directly into the intake manifold below.
  • the intake manifold vacuum is sensed in a line 82 having branches 84 and 86.
  • the vacuum in line 84 is sensed to line 52 and chamber 46 through a restriction or orifice 88 and a vacuum reservoir or accumulator indicated schematically at 90.
  • the orifice 88 prevents momentary fluctuations in the manifold vacuum from affecting the level of vacuum in the reservoir 90. More importantly, it prevents a sudden decay in the manifold vacuum, such as at engine shutdown, from equally suddenly decaying the vacuum in the reservoir.
  • Branch 86 connects to line 54 and chamber 48 through a spring vented, electrically connected valve 92 of the on-off type. More specifically, the valve body is illustrated schematically as provided with a straight through passage 94 and a vent or atmospheric passage 96.
  • a solenoid 98 when energized normally positions the valve as shown to connect passage 86 to passage 54 to allow vacuum to be applied to servo chamber 48.
  • a spring 99 moves valve 92 to vent passage 54 when the solenoid is de-energized.
  • Valve 92 preferably forms part of the conventional engine ignition circuit. Details of the construction and operation of the same are not given since they are known and believed to be unnecessary for an understanding of the invention. Suffice it to say, however, that the latter would include an ignition key operated switch bridging or breaking the circuit from a battery to the coil of solenoid 98. When the coil is energized,
  • valve 92 will be forced rightwardly against the force of a spring 99 to the position shown.
  • servo chambers 46 and 48 Prior to engine start up, servo chambers 46 and 48 are at atmospheric pressure, permitting the stronger spring to locate the plunger end 62 against the end of sleeve 66 and weaker spring 78 to position the secondary spring assembly as a unit to the right as shown with sleeve flange 72 against housing shoulder 76. This positions lever 38 to open the throttle valve to the idle speed or start position 36.
  • the throttle valve is'now in the position 37, thereby permitting a greater and leaner flow of air and fuel into the combustion chambers sufficient to scavenge the same of exhaust gases. This provides a more complete combustion at this time and minimizes the passage .of unburned hydrocarbons into the atmosphere. It will be noted of course that the vacuum in reservoir will also slowly increase until the vacuum levels in both chambers are equalized. Soon thereafter, the vacuum decrease, and/or the increase in the reservoir vacuum line, will permit the servo springs to reposition the throttle valve to the idle speed position 36 shown.
  • the invention provides a throttle valve positioner that increases 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 rest; and repositions the throttle valve to an attitude providing engine starting and idling.
  • a carburetor throttle valve positioner comprising, in combination, an engine carburetor having an induction passage open to ambient essentially 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 an essentially closed position to an engine idle speed posi tion and beyond to a wide open throttle position, and
  • control means including a vacuum controlled servo having a hollow shell with a flexible diaphragm dividing the shell into two chambers,
  • a movable plunger connected to the diaphragm and operatively engaged with the throttle valve
  • conduit means connecting each of the chambers to engine intake manifold
  • first spring means biasing the plunger towards an open beyond idle speed throttle valve first position
  • second spring means biasing the plunger in the opposite direction to oppose the first spring means and position the throttle valve to an engine idle speed second position below a predetermined intake manifold vacuum level
  • a positioner as in claim 2 the stop means constituting a sleeve surrounding a portion of the plunger and engagable at times with the plunger and the shell to position the plunger.
  • a positioner as in claim 2 the second spring means being seated between a first portion of the plunger and the stop means to biasingly separate the two, the stop means engaging a second portion of the plunger at times and the shell to position the plunger.

Landscapes

  • 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)
US00194258A 1971-11-01 1971-11-01 Carburetor throttle valve positioner Expired - Lifetime US3741177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19425871A 1971-11-01 1971-11-01

Publications (1)

Publication Number Publication Date
US3741177A true US3741177A (en) 1973-06-26

Family

ID=22716896

Family Applications (1)

Application Number Title Priority Date Filing Date
US00194258A Expired - Lifetime US3741177A (en) 1971-11-01 1971-11-01 Carburetor throttle valve positioner

Country Status (6)

Country Link
US (1) US3741177A (enrdf_load_stackoverflow)
JP (1) JPS5037329B2 (enrdf_load_stackoverflow)
AU (1) AU458510B2 (enrdf_load_stackoverflow)
CA (1) CA969044A (enrdf_load_stackoverflow)
DE (1) DE2251345A1 (enrdf_load_stackoverflow)
GB (1) GB1370069A (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795230A (en) * 1973-03-27 1974-03-05 Toyo Kogyo Co Primary air supply for an internal combustion engine
US3957022A (en) * 1975-09-02 1976-05-18 Ford Motor Company Carburetor deceleration emission control
US4016852A (en) * 1975-04-19 1977-04-12 Toyota Jidosha Kogyo Kabushiki Kaisha Apparatus for preventing after-burning in internal combustion engine
US4050436A (en) * 1976-03-17 1977-09-27 Crabtree Roger A Idle system blocking means
US4073272A (en) * 1976-10-08 1978-02-14 Tom Mcguane Industries, Inc. Throttle control system
US4272459A (en) * 1979-01-04 1981-06-09 Ford Motor Company Carburetor accelerator pump lockout system
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
US4375748A (en) * 1980-05-26 1983-03-08 Nissan Motor Co., Limited Engine system with exhaust turbine supercharger
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
FR2856113A1 (fr) * 2003-06-11 2004-12-17 Stihl Ag & Co Kg Andreas Moteur a combustion interne
US20060151894A1 (en) * 2005-01-11 2006-07-13 Walbro Engine Management, L.L.C. Carburetor and solenoid assemblies and methods of assembling the same

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5061524A (enrdf_load_stackoverflow) * 1973-10-05 1975-05-27
JPS5411860B2 (enrdf_load_stackoverflow) * 1974-06-06 1979-05-18
JPS5420501Y2 (enrdf_load_stackoverflow) * 1974-12-20 1979-07-24
JPS5314825Y2 (enrdf_load_stackoverflow) * 1974-12-24 1978-04-19
DE2944740A1 (de) * 1979-11-06 1981-05-14 Volkswagenwerk Ag, 3180 Wolfsburg Schliessdaempfer fuer vergaserdrosselklappen von kraftfahrzeugen
DE3037398C2 (de) * 1980-10-03 1984-11-15 Audi Nsu Auto Union Ag, 7107 Neckarsulm Stelleinrichtung für die Drosselklappe eines Vergasers
JPH0437235Y2 (enrdf_load_stackoverflow) * 1984-10-30 1992-09-02

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795230A (en) * 1973-03-27 1974-03-05 Toyo Kogyo Co Primary air supply for an internal combustion engine
US4016852A (en) * 1975-04-19 1977-04-12 Toyota Jidosha Kogyo Kabushiki Kaisha Apparatus for preventing after-burning in internal combustion engine
US3957022A (en) * 1975-09-02 1976-05-18 Ford Motor Company Carburetor deceleration emission control
US4050436A (en) * 1976-03-17 1977-09-27 Crabtree Roger A Idle system blocking means
US4073272A (en) * 1976-10-08 1978-02-14 Tom Mcguane Industries, Inc. Throttle control system
US4272459A (en) * 1979-01-04 1981-06-09 Ford Motor Company Carburetor accelerator pump lockout system
US4375748A (en) * 1980-05-26 1983-03-08 Nissan Motor Co., Limited Engine system with exhaust turbine supercharger
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
US4433661A (en) 1980-06-20 1984-02-28 Bosch & Pierburg System Ohg Device for the speed-dependent closure limitation of a carburettor main throttle
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
FR2856113A1 (fr) * 2003-06-11 2004-12-17 Stihl Ag & Co Kg Andreas Moteur a combustion interne
US20060151894A1 (en) * 2005-01-11 2006-07-13 Walbro Engine Management, L.L.C. Carburetor and solenoid assemblies and methods of assembling the same
US7264230B2 (en) * 2005-01-11 2007-09-04 Walbro Engine Management, L.L.C. Carburetor and solenoid assemblies and methods of assembling the same

Also Published As

Publication number Publication date
AU458510B2 (en) 1975-02-27
JPS4853120A (enrdf_load_stackoverflow) 1973-07-26
JPS5037329B2 (enrdf_load_stackoverflow) 1975-12-02
CA969044A (en) 1975-06-10
GB1370069A (en) 1974-10-09
DE2251345A1 (de) 1973-05-10
AU4742472A (en) 1974-04-26

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