US3905346A - Choke cap altitude kit - Google Patents

Choke cap altitude kit Download PDF

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Publication number
US3905346A
US3905346A US453132A US45313274A US3905346A US 3905346 A US3905346 A US 3905346A US 453132 A US453132 A US 453132A US 45313274 A US45313274 A US 45313274A US 3905346 A US3905346 A US 3905346A
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United States
Prior art keywords
spring
source
heat
choke
temperature
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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
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US453132A
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English (en)
Inventor
Richard J Freismuth
Joseph F Lopiccola
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Ford Motor Co
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Ford Motor Co
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Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Priority to US453132A priority Critical patent/US3905346A/en
Priority to GB7453/75A priority patent/GB1493533A/en
Priority to CA221,589A priority patent/CA1034451A/en
Priority to DE2510899A priority patent/DE2510899C2/de
Priority to JP50030280A priority patent/JPS5821094B2/ja
Priority to AU79174/75A priority patent/AU485375B2/en
Application granted granted Critical
Publication of US3905346A publication Critical patent/US3905346A/en
Priority to CA286,822A priority patent/CA1036443A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F02M1/12—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 with means for electrically heating thermostat

Definitions

  • a carburetor has a choke system including a bimetallic spring that biases the choke valve closed with a force that increases with decrease in temperature.
  • a hot air tube connected from an exhaust manifold heat stove to the intake manifold flows hot air past the spring to warm it as the engine warms.
  • An electrical heater is activated above a predetermined temperature to provide supplemental heat to the spring to pull off the choke faster than by use of the hot air alone.
  • a further manifold vacuum actuated switch energizes the heater below the predetermined temperature whenever the manifold vacuum drops as a result of altitude changes below a level indicating insufficient hot air flow past the bimetallic spring to warm it.
  • This invention relates in general to a motor vehicle type carburetor: More particularly. it relates to a carburetor choke mechanism that provides the same cold engine operation regardless of changes in air density caused by changes in altitude.
  • More commercial carburetor chokes do not provide means for compensating for changes in air density with changes in altitude. Accordingly. when a car equipped with a conventional choke is operated in mountainous regions or at any level above that at which it was calibrated, the less dense air provides a richer mixture induction into the engine. The engine accordingly may load under acceleration, because less air now is available to combine with the liquid fuel droplets, resulting in less power output. In order to obtain the same acceleration, as at lower altitudes. therefore, the throttle plate is opened wider. This decays the lever of manifold vacuum as compared to that at the calibrated level.
  • lt is a still further object of the invention to provide a carburetor choke construction that includes, first, a thermostatically responsive bimetallic coiled spring that urges the choke closed with a force increasing with decreases in temperature from a predetermined level, secondly. a primary source of heat that is variable in output as a function of changes in engine operation to flow heat past the bimetallic spring to warm the same to oppose the choke closing force of the spring as a function of increasing engine temperature level, and, thirdly.
  • a second heat source adjacent the spring that is operable in response to altitude changes varying the primary heat source flow to provide at all times an essentially constant supply of heat to the spring whereby the choke system wili operate to provide the correct richness of the air/fuel mixture to the engine at all times during cold engine operation, regardless of changes in altitude.
  • FIG. 1 is a cross-sectional elevational view of a portion of a two-barrel carburetor embodying the invention
  • FIG. 2 is an enlarged view of a detail of FIG. 1;
  • FIG. 2a is a view corresponding to H0. 2 illustrating the parts in different operative positions;
  • FIG. 3 is a graph illustrating the operating characteristics of a detail shown in FIGS. 1 and 2.
  • FIG I is obtained by passing a plane through approximately one-half of a known type of two-barrel, downdraft type carburetor.
  • the portion of the carburetor shown includes an upper air horn section 12, an intermediate main body portion 14, and a throttle valve flange section 16.
  • the three carburetor sections are secured together by suitable means, not shown, over an intake manifold indicated partially at 18 leading to the engine combustion chambers.
  • Main body portion 14 contains the usual air-fuel mixture induction passages 20 having fresh air intakes at the air horn ends, and connected to manifold 18 at the opposite ends.
  • the passages are each formed with a main venturi section 22 containing a booster venturi 24 suitably mounted for cooperation therewith, by means not shown.
  • Air flow through passages 20 is controlled in part by a choke valve 28 unbalance mounted on a shaft 30 rotatably mounted on side portions of the carburetor air horn, as shown.
  • Flow of fuel and air through each passage 20 is controlled by a conventional throttle valve 36 (only one shown) fixed to a shaft 38 rotatably mounted in flange portion 16.
  • the throttle valves are rotated in a known manner by depression of the vehicle accelerator pedal, and move from an idle'speed position essentially blocking flow through passage 20 to a wide open position essentially at right angles to the position shown.
  • the rotative position of choke valve 28 is controlled by a scmiautomatically operating choke mechanism 40.
  • the latter includes a hollow housing portion 42 that is formed as an extension of the carburetor throttle flange.
  • the housing is apertured for supporting rotatably one end of a choke lever operating shaft 44, the
  • a bracket or lever portion 48 is fixed on the left end portion of shaft 44 for mounting the end of a rod 52 that is pivoted to choke valve shaft 30. It will be clear that rotation of shaft 44 in either direction will correspondingly rotate choke valve 28 to open or close the carburetor air intake. as the cause may be.
  • An essentially L-shaped thermostatic spring lever 54 has one leg 56 fixedly secured to the opposite or righthand end portion of shaft 44.
  • the other leg portion 58 of the lever is secured to the outer end 59 of a coiled bimetallic thermostatic spring element 60 through an arcuate slot in an insulating gasket 64.
  • Leg 56 is also pivotally fixed to the rod 76 of a piston 78.
  • the latter is movably mounted in a bore 79 in housing 42.
  • the under surface of piston 78 is acted upon by vacuum in a passage 80 that is connected to carburetor main induction passages by a port 82 located just slightly below throttle valve 36. Piston 78, therefore. is always subjected to any vacuum existing in the intake manifold passage portion 18.
  • the casing 42 is provided with a hot air passage 68 connected to an exhaust manifold heat stove. for example.
  • the cylinder in which piston 78 slides is provided with bypass slots. not shown, in a known manner so that the vacuum acting on the piston will cause a flow of the hot air from passage 68 to passage 80. More specifically. hot air will flow into the area round the spring coil 60 through a hole in gasket 64 and out through the slot to the bypass slots around piston 78.
  • thermostatic spring element 60 will contract or expand as a function of the changes in ambient temperature conditions of the air entering tube 68; or. if there is no flow. the temperature of the air within chamber 74. Accordingly, changes in ambient temperature will rotate the spring lever 54 to rotate shaft 44 and choke valve 28 in one or the other directions as the case may be.
  • a cold weather start of a motor vehicle requires a richer mixture than a warmed engine start because considerably less fuel is vaporized. Therefore. the choke valve is shut or nearly shut to increase the pressure drop thereacross and draw in more fuel. Once the engine does start. however. then the choke valve should be opened slightly to lean the mixture to prevent engine flooding as a resulting of an excess of fuel.
  • the choke mechanism described automatically accomplishes the action described. That is. on cold weather starts, the temperature of the air in chamber 74 will be low so that spring element 60 will contract and rotate shaft 44 and choke valve 28 to a closed or nearly closed position, as desired. Upon cranking the engine. vacuum in passage 80 will not be sufficient to move piston 78 to open the choke valve. Accordingly,
  • FIG. 2 shows thermostatic spring coil 60 centrally staked to a metal post 84.
  • the post is formed as an integral part of an aluminum disc 85.
  • the disc constitutes a heat sink or transfer member to evenly radiate heat to the coil from a heater element 86 to which it is secured.
  • Heater element 86 is a positive temperature coefficient (PTC) semiconductor in the shape of a flat ceramic disc. It is fixed on disc and has a central spring-leg type current carrying contact lug 88. The lug projects through a hole in a wall 89 of an insulated cover or choke cap 90. The disc 85 is grounded through the cover to the cast choke housing by extensions and ground terminals 92. Lug 88 is adapted to be engaged at times by the face of a bimetallic thermal switch 94. The switch is of the overcenter spring type. and is sensitive to ambient temperature changes. The switch has a central hole through which projects a current carrying lug 96. The lug 96 is fixed to a spring leg type conductor 98 connected to an electrical spade-like terminal 100. The terminal would be connected to any suitable source ofelectrical energy. such as the vehicle alternator. so that current would be supplied as long as the vehiclc is running.
  • PTC positive temperature coefficient
  • the choke cap also includes a vacuum switch 102 that is of the plug-in type. That is. switch 102 has a hollow housing 103, through one side of which projects a pair of current carrying contact prongs 104. 106. Prong 104 extends through an electrical socket 107 in cap 90 to a position adjacent the backside of contact lug 96. it is spaced from the lug when the bimetal switch 94 is in the overcenter position shown, contacting lug 88. When bimetal switch 94 moves overcenter to its alternate position. lug 96 engages prong 104 to conduct current through it. Prong 106 on the other hand extends through an electrical socket 108 as shown into engagement with a current carrying connector 1 10 fixed to lug 88. to conduct current to heater 86 in a manner to be described.
  • switch 102 The hollow interior of switch 102 is divided by an an nular flexible diaphragm 111 into an air chamber 112 and a manifold vacuum chamber 113.
  • a vacuum tube 114 leads into chamber 113 and is connected at its other end. not shown, to a suitable manifold vacuum port similar to carburetor port 82, for example.
  • Chamber 112 is vented to ambient pressure through a hole, not shown. in housing 102. Attached to diaphragm 111, on the air chamber side. is a contact bridge plate 116. A preloaded spring 118. in vacuum chamber 113, biases the diaphragm 111 and contact plate 116 to a bridging position with respect to prongs 104 and 106.
  • the force of spring 118 is chosen to be such as to require a net manifold vacuum force of at least as high as 2 inches Hg., for example. in chamber 113 before the diaphragm will be drawn rightwardly and unbridge contacts 104 and 106 to break the circuit and open the switch.
  • heater element 86 it is a characteristic of the PTC heater that its internal resistance varies directly with the skin temperature of the element, from a predetermined switch point Ts.
  • the change in the internal resistance is not a linear function of the elements internal temperature but varies in the manner shown more clearly in FIG. 3.
  • the PTC heater 86 is electrically energized. as by applying line voltage to its terminals from the alternator when either switch 94 or 102 closes.
  • the Joule heat causes rapid self-heating of the PTC element.
  • the heater resistance remains almost constant as it heats from room temperature. It increases as the PTC temperature nears the switching temperature Ts. or desired upper limit. at which point the resistance increases sharply, as shown.
  • the electrical characteristics can be controlled by the chemical composition and process of making it.
  • the PTC device provides heat to bimetal spring 60 that is supplemental or substitutive to that provided by the primary exhaust manifold hot air system. depending upon whether switch 94 or 102 is closed. When current passes through the PTC element. a change in the internal temperature is noticed. This heat generated is transferred by conduction to spring 60 through the post 84 and by radiation to the spring from the heat sink 85.
  • the vacuum switch therefore bypasses the open bimetal switch 94 to separately and in parallel energize the PTC heater until such time as the manifold vacuum again rises over the 2 inches Hg. level (when the hot air flow is sufficient) sufficient to overcome the force of spring 118 and unbridge contacts 104 and 106.
  • switch 102 will be so constructed and arranged as to be triggered into action whenever the manifold vacuum drops to a level indicating insufficient airflow through the choke housing. It will be clear of course that the particular level desired can be controlled by the choice of the preload of spring II8.
  • the bimetal switch 94 moves overcenter to the position shown in FIG. 2 engaging lugs 96 and 88 and energizing the PTC heater 86.
  • the overcenter action permits the spring legs of contact 98 to move to the left and disengage the current source from the vacuum switch prong 104.
  • the bimetal coiled spring 60 therefore, will unwind as a function or both the exhaust manifold stove heat and the supplemental heat from the energized PTC element, which will permit the opening of the choke valve by airflow faster than were it being controlled by the primary heat source along.
  • the vacuum switch 102 is inoperative to supply current to the PTC element.
  • the invention provides a simple plug-in type vacuum switch that can be added to a conventional electric choke type carburetor construction to assure heating of the choke bimetal below a predetermined temperature level whenever the manifold vacuum drops below a predetermined level. Therefore, altitude changes producing lower manifold vacuum levels are compensated for by providing a substitutive heat source to the bimetal during low vacuum conditions that are indicative ofinsufficient hot airflow through the choke housing.
  • An automatic choke system for use with a carburetor having an air/fuel induction passage and an unbalance mounted. air movable choke valve mounted for variable movement across the passage to control airflow through the passage.
  • thermostatic spring means operably connected to the choke valve urging the choke valve towards a closed position with a force increasing as a function ofdecreases in the temperature ofthe spring means from a predetermined level.
  • an intermittently operable heater device located adjacent the spring means operable to transfer its heat output to the spring means when operable to reduce the choke valve closing force of the spring means and permit opening of the choke valve by airflow through the passage against it.
  • engine vacuum responsive means operable below a predetermined temperature to selectively render the heater device operable and inoperable in response to changes in engine vacuum.
  • circuit means connect ing the source to the heater device, temperature sensitive switch means in the circuit means operable to break and make the circuit as a function of temperature changes from a predetermined level,
  • a two phase automatic choke system for use with an internal combustion engine carburetor having an air/fuel induction passage open at one end and adapted to be connected to an engine intake manifold at the other end for subjecting the passage to varying manifold vacuum, the passage having a throttle valve rotatably mounted across the passage adjacent the other end for a variable movement between positions opening and closing the passage to control airfuel flow through it,
  • the choke including an unbalance mounted, air mov able choke valve rotatably mounted across the passage adjacent the one end for variable opening and closing movements to control airflow towards the throttle valve,
  • thermostatically responsive coiled spring operably connected to the choke valve and normally urging the choke valve towards a closed position with a force increasing with decreases in the temperature of the spring from a predetermined level
  • a heat source transferring engine heat to the coiled spring comprising a hot air containing duct operably connected from the engine exhaust system at one end of the duct to the intake manifold at the other end of the duct past the coiled spring for warming the spring to reduce its choke valve closing force
  • the supplemental heat means including a source of electrical energy, a heater device located adjacent the thermostatic spring and operable to transfer its heat output to the spring to reduce the choke closing force and permit opening of the choke valve by airflow through the passage against it, temperature responsive means connecting the heater device to the source at all times above a predetermined temperature and disconnecting the heater device from the source below the predetermined temperature, and other means controlled by manifold vacuum to connect the source to the heater device below the predetermined temperature bypassing the temperature responsive device.
  • a choke system as in claim 3. the means controlled by vacuum comprising an electrical switch having a pair of spring bridged contacts when bridged connecting the heat source to the heater device. and a conduit connecting engine manifold vacuum to the switch whereby vacuum above a predetermined level acts to unbridge the contacts and open the connection be tween the heater device and source.
  • a choke system as in claim 4, the heater device comprising a self-limiting output temperature positive temperature coefficient heater characterized by increasing internal impedance with increases in internal temperature up to its limit limiting further current flow and heat buildup, thereby eliminating the need for a thermostatic cut-off switch to prevent heat damage to the spring.
  • a two phase automatic choke system for use with an internal combustion engine carburetor having an air/fuel induction passage open at one end and adapted to be connected to an engine intake manifold at the other end for subjecting the passage to varying manifold vacuum, the passage having a throttle valve rotatably mounted across the passage adjacent the other end for a variable movement between positions opening and closing the passage to control air/fuel flow through it,
  • the choke system including an unbalance mounted
  • a thermostatically responsive coiled spring operably connected to the choke valve and normally urging the choke valve towaards a closed position with a force increasing with decreases in the temperature of the spring from a predetermined level
  • first power means operably connected to the choke valve and sensitive to engine manifold vacuum for moving the choke valve from an initially closed position towards an open position in opposition to the spring and in response to operation of the engine from a start to a running condition
  • the first power means including a vacuum operated movable piston means, and a first heat source transferring engine heat to the spring and comprising a hot air containing duct operably connected from the engine exhaust system at one end of the duct to the intake manifold at the other end of the duct past the spring for warming the spring to reduce its choke valve closing force,
  • supplemental electrically controlled, temperature re sponsive heat means in a parallel arrangement with the first power means heat source for effecting subsequent movement of the choke valve towards a position more open than the position effected by the first power means alone.
  • the supplemental means including a source of electrical energy, a positive temperature coefficient (PTC) heater device located adjacent the spring and operable to transfer its heat output to the spring to reduce its choke closing force and permit opening of the choke valve by airflow through the passage against it, temperature responsive switch means operable above a predetermined ambient air temperature to connect the source to the heater device to energize the heater device.
  • PTC positive temperature coefficient
  • an engine manifold vacuum controlled switch connected in parallel to the temperature responsive device between the heater device and source for bypassing the temperature responsive switch means below the predetermined temperature to energize the heater device, the switch being spring closed to complete a circuit between the source and heater device, and opened by manifold vacuum above a predetermined level applied thereto. the latter level indicating sufficient pressure differential between the hot air source and manifold vacuum to draw sufficient hot air past the spring to warm the same.
  • An automatic choke system for use with a carburetor having an air/fuel induction passage and an unbalance mounted, air movable choke valve mounted for variable movement across the passage to control airflow through the passage,
  • thermostatic spring means operably connected to the choke valve urging the choke valve towards a closed position with a force increasing as a function of decreases in the temperature of the spring means from a predetermined level.
  • a first source of heat flow adjacent the spring means to warm the spring means to reduce the choke valve closing force of the spring means and permit opening of the choke valve by airflow through the passage against it, the first heat flow source providing a variable flow of heat
  • a second intermittently operated source of heat adjacent the spring means rendered operable in response to a decay below a predetermined level in the flow of heat from the first source to transfer heat to the spring means and compensate for the decay in heat flow from the first source.
  • the first heat source comprising a hot air tube connected at one tube end to air at ambient pressure adjacent the engine exhaust system and at the other tube end to the engine intake manifold, with the air flow through the tube being exposed to and heating the spring means at alrate varying as a function of the vacuum changes.
  • the second source of heat comprising an electrically controlled heater device, a source of electrical energy, an electrical circuit connecting the heater device to the source, and a manifold vacuum controlled on-off switch in the circuit operable at times upon decay of manifold vacuum below a predetermined level to actuate the switch to an on position and energize the heater device.
  • the switch comprising a unitized removable plug-in prong type switch for easy disconnection of the switch from the circuit.
  • the heater device including a socket type receptacle for receiving the prongs of said switch.

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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)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US453132A 1974-03-20 1974-03-20 Choke cap altitude kit Expired - Lifetime US3905346A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US453132A US3905346A (en) 1974-03-20 1974-03-20 Choke cap altitude kit
GB7453/75A GB1493533A (en) 1974-03-20 1975-02-21 Controlling choke valves of i c engine carburettors
CA221,589A CA1034451A (en) 1974-03-20 1975-03-07 Choke cap altitude kit
DE2510899A DE2510899C2 (de) 1974-03-20 1975-03-13 Kaltstarteinrichtung für Vergaser von Brennkraftmaschinen
JP50030280A JPS5821094B2 (ja) 1974-03-20 1975-03-14 自動チョ−ク装置
AU79174/75A AU485375B2 (en) 1974-03-20 1975-03-17 Choke cap altitude kit
CA286,822A CA1036443A (en) 1974-03-20 1977-09-15 Altitude compensation in carburetor choke systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US453132A US3905346A (en) 1974-03-20 1974-03-20 Choke cap altitude kit

Publications (1)

Publication Number Publication Date
US3905346A true US3905346A (en) 1975-09-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US453132A Expired - Lifetime US3905346A (en) 1974-03-20 1974-03-20 Choke cap altitude kit

Country Status (5)

Country Link
US (1) US3905346A (de)
JP (1) JPS5821094B2 (de)
CA (1) CA1034451A (de)
DE (1) DE2510899C2 (de)
GB (1) GB1493533A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044736A (en) * 1973-07-18 1977-08-30 Toyota Jidosha Kogyo Kabushiki Kaisha Device for controlling a choke valve in a carburetor
US4324745A (en) * 1979-10-06 1982-04-13 Aisan Kogyo Kabushiki Kaisha Device for automatically regulating a choke valve in a carburetor for an internal combustion engine
US7533654B1 (en) * 2008-02-29 2009-05-19 Detroit Diesel Corporation Adaptive gains for electronic air intake throttle control

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2633546C2 (de) * 1976-05-31 1982-12-16 Société Industrielle de Brevets et d'Etudes S.I.B.E. S.A, 92200 Neuilly-sur-Seine Vergaser für Verbrennungsmotoren mit Kaltstart-Hilfsvorrichtung
DE3310783A1 (de) * 1983-03-24 1984-09-27 Schmelzer Corp., Flint, Mich. Fluidsteuerventil mit einem temperaturempfindlichen verzoegerungsventil
GB2242570A (en) * 1990-03-27 1991-10-02 Crabtree Electrical Ind Ltd "Contactor and switch therefor"

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2309170A (en) * 1940-12-18 1943-01-26 Packard Motor Car Co Internal combustion engine
US3159692A (en) * 1962-04-02 1964-12-01 Holley Carburetor Co Choke mechanism
US3697937A (en) * 1969-07-09 1972-10-10 Schlumberger Technology Corp Acoustic reflection coefficient logging
US3752133A (en) * 1972-11-15 1973-08-14 Ford Motor Co Multiple heat automatic choke
US3800762A (en) * 1971-12-27 1974-04-02 Ford Motor Co Supplemental pulldown mechanism for carburetor automatic choke
US3831567A (en) * 1973-08-16 1974-08-27 Ford Motor Co Supplemental pulldown mechanism for carburetor automatic choke

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171868A (en) * 1961-08-01 1965-03-02 Chrysler Corp Automatic choke for carburetor
JPS4227Y1 (de) * 1964-10-05 1967-01-05
FR215189A (de) * 1971-08-04
US4083336A (en) * 1971-08-10 1978-04-11 Texas Instruments Incorporated Condition responsive control device
JPS4859224A (de) * 1971-11-29 1973-08-20
JPS5029928A (de) * 1973-07-18 1975-03-26

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2309170A (en) * 1940-12-18 1943-01-26 Packard Motor Car Co Internal combustion engine
US3159692A (en) * 1962-04-02 1964-12-01 Holley Carburetor Co Choke mechanism
US3697937A (en) * 1969-07-09 1972-10-10 Schlumberger Technology Corp Acoustic reflection coefficient logging
US3800762A (en) * 1971-12-27 1974-04-02 Ford Motor Co Supplemental pulldown mechanism for carburetor automatic choke
US3752133A (en) * 1972-11-15 1973-08-14 Ford Motor Co Multiple heat automatic choke
US3831567A (en) * 1973-08-16 1974-08-27 Ford Motor Co Supplemental pulldown mechanism for carburetor automatic choke

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044736A (en) * 1973-07-18 1977-08-30 Toyota Jidosha Kogyo Kabushiki Kaisha Device for controlling a choke valve in a carburetor
US4324745A (en) * 1979-10-06 1982-04-13 Aisan Kogyo Kabushiki Kaisha Device for automatically regulating a choke valve in a carburetor for an internal combustion engine
US7533654B1 (en) * 2008-02-29 2009-05-19 Detroit Diesel Corporation Adaptive gains for electronic air intake throttle control

Also Published As

Publication number Publication date
JPS5821094B2 (ja) 1983-04-27
DE2510899C2 (de) 1982-10-07
CA1034451A (en) 1978-07-11
GB1493533A (en) 1977-11-30
AU7917475A (en) 1976-09-23
JPS50128018A (de) 1975-10-08
DE2510899A1 (de) 1975-09-25

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