US3907944A - Choke control system for internal combustion engines - Google Patents

Choke control system for internal combustion engines Download PDF

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Publication number
US3907944A
US3907944A US484872A US48487274A US3907944A US 3907944 A US3907944 A US 3907944A US 484872 A US484872 A US 484872A US 48487274 A US48487274 A US 48487274A US 3907944 A US3907944 A US 3907944A
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United States
Prior art keywords
choke valve
diaphragms
liquid chamber
engine
chamber
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
US484872A
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English (en)
Inventor
Masahiko Nakada
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Toyota Motor Corp
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Toyota Motor Corp
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Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
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Publication of US3907944A publication Critical patent/US3907944A/en
Anticipated expiration legal-status Critical
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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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
    • F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat
    • 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
    • Y10S261/18—Dashpots

Definitions

  • a system for controlling the choke valve of an internal combustion engine comprises a diaphragm box having therein a pair of diaphragms spaced apart from each other to define therebetween a liquid chamber which is filled with a liquid whose viscosity varies in accordance with temperature change.
  • a partition wall having an orifice defined therethrough bisects the liquid chamber and negative pressure from the intake manifold of the engine acts upon one of the diaphragms to actuate the other of said diaphragms which has attached thereto an operating rod connected to the choke valve of the engine.
  • the responsiveness of the control system varies with temperature as a result of the changing viscosity levels of the liquid contained within the liquid chamber.
  • the present invention relates generally to choke valve control systems for internal combustion engines and more particularly to a system whereby the choke valve may be forcibly moved to its fully opened position in response to negative pressure from the intake manifold of the engine.
  • the present invention is directed toward overcoming such problems by providing an improved choke valve control system which lowers the choke valve opening speed in order to prolong the warming time of the engine at cold start and thereby enhance operating performance.
  • the present invention may be described as a choke valve control system for an internal combustion engine which includes an intake manifold and a choke valve, said control system comprising, in combination, a diaphragm box, a pair of diaphragms located within said box and spaced apart from each other to define a liquid chamber therebctween, a liquid contained within said chamber adapted to undergo viscosity change in accordance with changes in temperature, a partition wall within said box bisecting said liquid chamber, orifice means defined through said partition wall, a choke valve operating rod interconnected between one of said diaphragms and said choke valve and movable through an operating stroke between positions into and out of driving engagement with said choke valve, a diaphragm chamber defined within said box by the other of said diaphragms on a side thereof opposite said liquid chamber, negative pressure conduit means connected between said intake manifold and said diaphragm chamber, and spring means biasing both said diaphragms toward
  • FIG. 1 a carburetor 1, an intake manifold pipe 2, an exhaust manifold 3 and a throttle valve 4 located within the body of the carburetor l.
  • a choke valve 5 is arranged to be controlled by a bimetallic member (not shown) which may be heated either by the exhaust gases of the engine or by an electric heater.
  • the choke valve 5 is mounted upon a choke valve shaft 6 and a choke lever 7 having an elongated slot 8 is mounted upon the shaft 6.
  • a choke valve control system 10 comprises a diaphragm box 1 l, a pair of diaphragms 12 and 13 which are spaced apart Within the box 1 1 to define therebetween a liquid chamber 14, and a partition wall 15 located between the diaphragms 12 and 13 bisecting the liquid chamber 14.
  • the liquid chamber 14 maybe filled with a liquid which, for example, may be oil whose viscosity is varied in accordance with variations in temperature.
  • An orifice 16 is provided to extend through the partition wall 15 and a choke valve operating rod 17 secured to one of the diaphragms 12 is interconnected between the diaphragm 12 and the choke valve 5.
  • a vacuum conduit 19 connects the intake manifold 2 with a diaphragm chamber 18 defined within the diaphragm box 11 by the diaphragm 13 on a side of the diaphragm 13 opposite the side of the liquid chamber 14.
  • Springs 20 and 21 are provided to normally bias both the diaphragms 12 and 13 in a direction toward which the control system does not restrict movement of the choke valve 5.
  • the choke valve operating rod 17 has one end loosely fitted in sliding engagement within the elongated slot 8 in the choke lever 7.
  • the right hand end of the operating rod 17 will be located within the slot 8 at a portion of its operating stroke through which the rod 17 is out of driving engagement with the choke valve 5.
  • the rod 17 is moved to the left, as viewed in FIG. 1, the right hand end thereof will engage the end of the slot 8 thereby placing the rod 17 into driving engagement with the choke valve 5.
  • a check valve 22 is provided on the partition wall and a valve 23 which is arranged to be opened or closed in accordance with the operating temperature conditions of the engine is provided within the vacuum conduit 19.
  • the choke valve control system in accordance with the present invention, before the engine is started, the choke valve control system will be in the condition depicted in FIG. 1. That is, the diaphragms 12 and 13 will be biased to the right as shown in FIG. .1 by the springs and 21, respectively, and the choke valve operating rod 17 will be out of driving engagement with the choke valve 5 by virtue of its sliding engagement with the slot 8. Furthermore, the valve 23 in the conduit 19 will remain in its closed condition.
  • the choke valve 5 When the engine is started, the choke valve 5 will be controlled by the bimetallic member (not shown) regardless of the behavior of the choke valve control system 10. However, when the engine has reached a specific level of warming, it is desirable to fully open the choke valve 5 in order to reduce the harmful components in the exhaust gases.
  • the valve 23 is opened in response to the warmed-up condition of the engine in order to communicate the intake manifold 2 with the diaphragm chamber 18. At this point, negative pressure in the diaphragm chamber 18 actuates the diaphragms 12 and 13 in order to drive the choke valve 5 to its fully opened position against the force of the springs 20 and 21 and against the flow resistance of an orifice 16 which is defined to extend through the partition wall 15.
  • the diaphragms 12 and 13 will be quickly drawn to the left, as viewed in FIG. 1, in order to fully open the choke valve 5. This enables a quick decrease of harmful components in the exhaust gas.
  • the check valve 22 located on the partition wall 15 is arranged such that it will be in the opened condition, as depicted in FIG. 2, when no vacuum is applied in the diaphragm chamber 18, with the valve 22 being actuated to its closed condition depicted in FlG. 3, when vacuum acts upon the diaphragm chamber 18.
  • the diaphragms 12 and 13 will be quickly returned to the positions thereof indicated in FIG. 1.
  • a choke valve control system for an internal combustion engine which includes an intake manifold and a choke valve
  • said control system comprising, in combination, a diaphragm box, a pair of diaphragms lo-' cated within said box and spaced apart from each other to define within said box a liquid chamber therebetween, said liquid chamber being adapted to contain therein a liquid which will undergo viscosity change in accordance with changes in temperature, a partition wall within said box bisecting said liquid chamber, orifice means defined through said partition wall, a choke valve operating rod interconnected between one of said diaphragms and said choke valve, and movable through an operating stroke between positions into and out of driving engagement with said choke valve, a diaphragm chamber defined within said box by the other of said diaphragms on a side thereof opposite said liquid chamber, vacuum conduit means connected between said intake manifold and said diaphragm chamber, and spring means biasing both said diaphragms toward a direction tending to place said operating rod out
  • a system according to claim 1 including a check valve located in said partition wall and adapted to open and close in response to vacuum applied in said diaphragm chamber.
  • a system according to claim 1 including valve means located in said conduit means and adapted to open and close in response to the operating temperature of said engine.
  • said orifice means comprise a pair of orifices defined through said partition wall and wherein said check valve comprises a member adapted to be moved to open and close one of said orifices in response to vacuum applied in said diaphragm chamber.
  • valve means is arranged to open and to maintain said conduit means in flow communication between said intake manifold and said diaphragm chamber when said engine operating temperature is above a predetermined

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
US484872A 1973-07-06 1974-07-01 Choke control system for internal combustion engines Expired - Lifetime US3907944A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48075633A JPS5022936A (es) 1973-07-06 1973-07-06

Publications (1)

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US3907944A true US3907944A (en) 1975-09-23

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Application Number Title Priority Date Filing Date
US484872A Expired - Lifetime US3907944A (en) 1973-07-06 1974-07-01 Choke control system for internal combustion engines

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JP (1) JPS5022936A (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569803A (en) * 1983-02-21 1986-02-11 Aisin Seiki Kabushiki Kaisha Dash pot device
US4948536A (en) * 1989-01-31 1990-08-14 Tillotson, Ltd. Automatic choke for small two-cycle internal combustion engines
US20030164558A1 (en) * 2001-12-27 2003-09-04 Honda Giken Kogyo Kabushiki Kaisha Control system for choke valve of carburetor

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674268A (en) * 1949-10-29 1954-04-06 Standard Thompson Corp Device for controlling the communication between a pressure tank and the atmosphere
US2932203A (en) * 1954-03-16 1960-04-12 Melville F Peters Fluid pressure systems
US3190623A (en) * 1961-08-01 1965-06-22 Chrysler Corp Automatic choke for carburetor
US3333770A (en) * 1966-07-22 1967-08-01 Gen Motors Corp Vacuum position servo system
US3670708A (en) * 1970-12-31 1972-06-20 Ford Motor Co Integrated anti-stall and idle-speed adjustment mechanism
US3739760A (en) * 1972-03-29 1973-06-19 Ford Motor Co Enrichment fuel-air supply system
US3752450A (en) * 1971-07-26 1973-08-14 Ford Motor Co Vacuum controlled carburetor throttle valve positioner
US3791358A (en) * 1971-12-08 1974-02-12 Nissan Motor Carburetor control mechanism for an automotive gasoline powered internal combustion engine
US3800762A (en) * 1971-12-27 1974-04-02 Ford Motor Co Supplemental pulldown mechanism for carburetor automatic choke

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674268A (en) * 1949-10-29 1954-04-06 Standard Thompson Corp Device for controlling the communication between a pressure tank and the atmosphere
US2932203A (en) * 1954-03-16 1960-04-12 Melville F Peters Fluid pressure systems
US3190623A (en) * 1961-08-01 1965-06-22 Chrysler Corp Automatic choke for carburetor
US3333770A (en) * 1966-07-22 1967-08-01 Gen Motors Corp Vacuum position servo system
US3670708A (en) * 1970-12-31 1972-06-20 Ford Motor Co Integrated anti-stall and idle-speed adjustment mechanism
US3752450A (en) * 1971-07-26 1973-08-14 Ford Motor Co Vacuum controlled carburetor throttle valve positioner
US3791358A (en) * 1971-12-08 1974-02-12 Nissan Motor Carburetor control mechanism for an automotive gasoline powered internal combustion engine
US3800762A (en) * 1971-12-27 1974-04-02 Ford Motor Co Supplemental pulldown mechanism for carburetor automatic choke
US3739760A (en) * 1972-03-29 1973-06-19 Ford Motor Co Enrichment fuel-air supply system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569803A (en) * 1983-02-21 1986-02-11 Aisin Seiki Kabushiki Kaisha Dash pot device
US4948536A (en) * 1989-01-31 1990-08-14 Tillotson, Ltd. Automatic choke for small two-cycle internal combustion engines
US20030164558A1 (en) * 2001-12-27 2003-09-04 Honda Giken Kogyo Kabushiki Kaisha Control system for choke valve of carburetor
US6722638B2 (en) * 2001-12-27 2004-04-20 Honda Giken Kogyo Kabushiki Kaisha Control system for choke valve of carburetor
EP1323916A3 (en) * 2001-12-27 2006-06-07 Honda Giken Kogyo Kabushiki Kaisha Control system for choke valve of carburetor
AU2002325400B2 (en) * 2001-12-27 2008-06-05 Honda Giken Kogyo Kabushiki Kaisha Control System for Choke Valve of Carburetor

Also Published As

Publication number Publication date
JPS5022936A (es) 1975-03-12

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