US3905345A - Choke assembly for internal combustion engines - Google Patents

Choke assembly for internal combustion engines Download PDF

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Publication number
US3905345A
US3905345A US426125A US42612573A US3905345A US 3905345 A US3905345 A US 3905345A US 426125 A US426125 A US 426125A US 42612573 A US42612573 A US 42612573A US 3905345 A US3905345 A US 3905345A
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US
United States
Prior art keywords
diaphragm
valve
choke
chambers
engine
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
US426125A
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English (en)
Inventor
Masahiko Nakada
Hirofumi Matsumoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
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Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Application granted granted Critical
Publication of US3905345A publication Critical patent/US3905345A/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
    • 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

Definitions

  • a choke valve regulator means for internal combustion engines is provided with a diaphragm box containing a diaphragm arranged capable of opening or closing the choke valve.
  • the diaphragm box is connected to a source of vacuum by a suction conduit having a check valve and a orifice.
  • a by-pass passage to allow air to enter the diaphram box is connected to the suction conduit and the by-pass passage is controlled by a solenoid switch valve so that the diaphragm will be operated to open the choke valve when the engine is warmed up and the vehicle reaches a certain speed.
  • the noxious exhaust gases such as carbon monoxide, CO, or hydrocarbons, HC, discharged from the engine are produced in greater amounts when the engine has not been warmed up. It is desired, therefore, to open the choke valve promptly after the engine has been warmed up to a certain degree.
  • This invention relates to a choke assembly capable of closing the choke valve at starting, idling, or low-speed running and to open the choke valve promptly when the engine has been warmed up more than a certain extent and once normal running has been commenced, thereby minimizing the discharge of the noxious exhaust gases.
  • the drawing is a schematic arrangement of a choke assembly according to the present invention.
  • Reference numeral 1 designates acarburetor having a venturi tube 2, a throttle valve 3 and a choke valve 4.
  • the choke valve 4 is provided with a known regulator mechanism (not shown) and a revolving shaft 7.
  • An intake manifold 5 has a water jacket 6.
  • a switch lever 8 Secured to the revolving shaft 7 of the choke is a switch lever 8 formed with an elongated slot 9 in which fits one end of a link 10 with the other end of the link 10 being secured to a diaphragm 11 which divides diaphragm box 12 into two chambers.
  • Spring 13 is positioned against diaphragm 11 in one of the chambers 14 in the diaphragm box 12.
  • a negative pressure conduit 15 is provided connecting the diaphragm chamber 14 and the intake manifold 5 while a orifice 16 with a check valve 17 are provided within this conduit 15.
  • By-pass pipe 18 connects the vacuum conduit 15 to the atmosphere as, for example, at the atmospheric side of the choke valve 4.
  • a solenoid valve 19 is placed within-theby-pass pipe 18 Additional elements include a battery ,20 and a temperature responsive switch 21 which is actuated when the water temperature in the water jacket 6 rises up over a certain level, such as 20 to;30C.
  • a vehicle speed responsive switch 22 is actuated when the vehicle speed exceeds a certain valve such as 10 to.20 km/h.
  • the water jacket temperature responsive switch 21 may be substituted by another type of thermal switch such as the type which is actuated in response to the lubricating oil temperature or the intake manifold wall temperature;
  • the vehicle speed responsive switch 22v may be replaced with a switch operable to detect the engine speed, the throttle opening, or other similar engine operating conditions.
  • the above-described apparatus of the present invention operates as follows. In the situation where the engine is not yet warmed up such that the cooling water temperature is low, or when the vehicle speed is low, both temperature responsive switch 21 and vehicle speed responsive switch 22 remain off.
  • the solenoid valve 19 is not excited so the bypass pipe 18 is open to allow the atmospheric air to flow into the diaphragm chamber 14 through the combination of the by-pass pipe 18, the solenoid valve 19 and the vacuum conduit 15. This keeps both sides of the diaphragm 11 at a substantially equal pressure, and thus the link 10 remains inoperative.
  • the opening of the choke valve 4 is then adjusted by a known choke valve regulator mechanism (not shown). Since the link 10 fits loosely within slot 9 in the lever 8, the link will not obstruct the movement of the choke valve 4. Although some of the air introduced through the by-pass pipe 18 flows into the intake manifold 5 by passing through the orifice 16, the check valve 17 and the vacuum conduit 15, this air is such a small amount that it will not produce any adverse effect on the engine performance.
  • the high negative pressure continues to be applied into the diaphragm chamber 14 by the action of the check valve 17 to keep the choke valve 4 in the full opened position even if the vacuum in the intake manifold should be lowered thereafter by, for example, a fullthrottle acceleration.
  • the choke valve 4 is opened fully to keep the discharge of the noxious exhaust gases to a minimum.
  • the choke valve even when high speed running is performed in the cold and the conventional bimetal for the choke valve is being cooled by the cold air, the choke valve will not be closed if the engine is in a warmed up condition and the vehicle speed is over a certain level.
  • a choke assembly for internal combustion engines having an intake manifold comprising a choke valve, a diaphragm box with a switch lever, a diaphragm within said diaphragm box dividing said diaphragm box into two chambers and connected to said switch lever of said choke valve,-a vacuum conduit connecting one of the chambers in said diaphragm box with the intake manifold, a check valve and throttle mechanism provided in said vacuum conduit, a by-pass pipe connected to said vacuum conduit between said one of the chambers and said check valve and throttle mechanism and establishing a conduit to atmosphere, a solenoid valve with an exciting coil provided in said by-pass pipe, a temperature responsive switch for detecting the degree of warm-up-of the engine and a vehicle speed responsive switch, both 'of'the responsiveswitches being connected in series to said exciting 'coil of said solenoid valve, wherein when the vehicle speed and warming up of the engine have each exceeded a certain level, the by-pass pipe is closed byisaid solenoid valve to
  • choke assembly according to claim 1, wherein a spring is positioned in said one of the chambers between said diaphragm'box and said diaphragm to urge said diaphragm toward the switch lever of said choke valve.
  • a choke assembly according to claim 1, wherein said check valve comprises a movable sealing means in the vacuum conduit which maintains in one of the chambers in said diaphragm box the highest vacuum produced in the intake manifold when the by-pass pipe is closed by said solenoid valve.

Landscapes

  • 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)
US426125A 1973-02-12 1973-12-19 Choke assembly for internal combustion engines Expired - Lifetime US3905345A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48016486A JPS5227769B2 (en, 2012) 1973-02-12 1973-02-12

Publications (1)

Publication Number Publication Date
US3905345A true US3905345A (en) 1975-09-16

Family

ID=11917597

Family Applications (1)

Application Number Title Priority Date Filing Date
US426125A Expired - Lifetime US3905345A (en) 1973-02-12 1973-12-19 Choke assembly for internal combustion engines

Country Status (3)

Country Link
US (1) US3905345A (en, 2012)
JP (1) JPS5227769B2 (en, 2012)
AU (1) AU473696B2 (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119683A (en) * 1977-05-31 1978-10-10 Toyota Jidosha Kogyo Kabushiki Kaisha Choke breaker system for a carburetor of an internal combustion engine
US20140109859A1 (en) * 2011-04-21 2014-04-24 Icomet S.P.A. Pressure reducer-regulator for feeding internal combustion engines with methane or other similar fuels
CN105240108A (zh) * 2015-06-29 2016-01-13 丁巧娜 发动机除冰控制器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5185045A (ja) * 1975-01-23 1976-07-26 Toyota Motor Co Ltd Nainenkikanyonenryozoryosochino jidoteishikiko
JPS5356425A (en) * 1976-11-01 1978-05-22 Aisan Ind Co Ltd Carburetor
NL8002343A (nl) * 1980-04-23 1981-11-16 Philips Nv Elektronenkanon en kathodestraalbuis bevattende een dergelijk elektronenkanon.
KR910007793B1 (ko) * 1988-11-02 1991-10-02 삼성전관 주식회사 전자총의 음극 및 그 제조방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624325A (en) * 1950-07-01 1953-01-06 Bendix Aviat Corp Carburetor control mechanism
US2979047A (en) * 1957-07-08 1961-04-11 Acf Ind Inc Automatic choke for small carburetors
US3534720A (en) * 1967-05-10 1970-10-20 Outboard Marine Corp Solenoid operated choke
US3791358A (en) * 1971-12-08 1974-02-12 Nissan Motor Carburetor control mechanism for an automotive gasoline powered internal combustion engine
US3799134A (en) * 1971-12-14 1974-03-26 Volkswagenwerk Ag Combustion engine with quick arrangement for its exhaust gas cleaning device during cold or idle run

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624325A (en) * 1950-07-01 1953-01-06 Bendix Aviat Corp Carburetor control mechanism
US2979047A (en) * 1957-07-08 1961-04-11 Acf Ind Inc Automatic choke for small carburetors
US3534720A (en) * 1967-05-10 1970-10-20 Outboard Marine Corp Solenoid operated choke
US3791358A (en) * 1971-12-08 1974-02-12 Nissan Motor Carburetor control mechanism for an automotive gasoline powered internal combustion engine
US3799134A (en) * 1971-12-14 1974-03-26 Volkswagenwerk Ag Combustion engine with quick arrangement for its exhaust gas cleaning device during cold or idle run

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119683A (en) * 1977-05-31 1978-10-10 Toyota Jidosha Kogyo Kabushiki Kaisha Choke breaker system for a carburetor of an internal combustion engine
US20140109859A1 (en) * 2011-04-21 2014-04-24 Icomet S.P.A. Pressure reducer-regulator for feeding internal combustion engines with methane or other similar fuels
US9194289B2 (en) * 2011-04-21 2015-11-24 Icomet S.P.A. Pressure reducer-regulator for feeding internal combustion engines with methane or other similar fuels
CN105240108A (zh) * 2015-06-29 2016-01-13 丁巧娜 发动机除冰控制器

Also Published As

Publication number Publication date
AU473696B2 (en) 1976-07-01
JPS5227769B2 (en, 2012) 1977-07-22
JPS49104032A (en, 2012) 1974-10-02
AU6386573A (en) 1975-06-26

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