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US 4,058,097 AGranted
Choke control
AssigneeTexas Instruments Incorporated
InventorsAllen H. Hutton, James J. Armstrong, III
Life of this patent
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AssigneeTexas Instruments Incorporated
InventorsAllen H. Hutton, James J. Armstrong, III
Estimating the term…
An automotive choke control with improved heating and cooling characteristics to more closely reflect an analogue of the engine temperature for reducing the pollutant content of automotive exhaust gases by regulating the choke. In the control two self-regulating electrical resistance heaters energizable under different conditions supply heat to a thermostat metal coil arranged to move and to open a choke valve as heated. A slotted heat sink plate with a rolled lip is positioned between the heaters and the coil to quickly and uniformly transfer heat to the coil while limiting the heat loss radially outward to the choke housing in which the control is contained. A thermally insulating gasket is also used to further thermally isolate the control from the housing. Additionally a conductive metal top hat is positioned on the opposite side of the coil from the plate to enhance quick, uniform heating and slow cool down.
Control means having an ambient temperature compensating feature for adjusting a choke in an automotive motor system as motor temperature increases after initiation of motor operation comprising heat response means movable in response to increase in temperature of said heat responsive means for adjusting the choke, heat sink means surrounding heat responsive means on three sides for providing uniform, quick heat transfer to said heat responsive means, said heat sink means comprising a bushing to which said heat response means is secured, a plate having heater portion and a mounting portion mounting said bushing and having one surface extending along one lateral edge of said coil and another surface on which said electrical heater means is mounted, and a flange member mounted on said bushing and having one surface extending along another lateral edge of said coil, self-regulating electrical resistance heater means mounted on said heat sink means and energizable from an electrical power source upon initiation of said motor operation for heating said heat responsive means, additional self-regulating electrical resistance heater means mounted on said heat sink means for supplementing heating of said heat responsive means when said additional heater means is energized, and thermostatic switch means connectable to an electrical power source upon initiation of said motor operation and actuable above a selected ambient temperature for energizing said additional heater means.
Control means having an ambient temperature compensation feature for adjusting a choke in an automotive motor system as motor temperature increases after initiation of motor operation comprising a housing of dielectric material with recess, a heat sink member of thermally and electrically conductive metal material having a heat sink plate with a heater portion and a mounting portion for mounting said member over said housing recess, and a bushing portion extending from said heater plate portion, a flange heat sink member of thermally conductive material mounted on said bushing portion opposite said heater plate portion, a thermostat metal coil secured at one end to said heat sink bushing portion and extending around said bushing portion along one surface of said heat sink plate and one surface of said flange member, said coil being movable in response to increase and decrease in coil temperature for adjusting said choke, self-regulating electrical resistance heater means having one end mounted on an opposite surface of said plate portion within said housing recess in electrically conductive relation to said heat sink member and in heat-transfer relation to said coil, electrical contact means engaging an opposite end of said heater means for energizing said heater from an electrical power source upon initiation of said motor operation for heating said coil, additional self-regulating electrical resistance heater means having one end mounted on said opposite surface of said plate within said housing recess in electrically conductive relation to said heat sink member and in heat-transfer relation to said coil, and thermostatic switch means engaging an opposite end of said additional heater means, said switch means being connectable to an electrical power source upon initiation of said motor operation and being actuable above a selected ambient temperature for energizing said additional heater means.
A carburetor for an internal combustion engine comprising an air and fuel induction passage, a choke valve for controlling the ratio of air to fuel in said passage, control means for setting the position of said choke valve in said passage, and a choke housing mounted on said engine containing said control, said control provided with resistance heater means, a heat sink means with a rolled lip and a gasket member mounted adjacent said lip for providing heat to a heat responsive means in said control while minimizing heat loss to said choke housing.
Control means having an ambient temperature compensating feature for adjusting a choke in an automotive motor system as motor temperature increases after initiation of motor operation comprising heat response means movable in response to increase in temperatures of said heat responsive means for adjusting the choke, heat sink means surrounding heat responsive means on three sides for providing uniform, quick heat transfer to said heat responsive means, said heat sink means comprising a bushing to which said heat response means is secured, a plate having heater portion and a mounting portion mounting said bushing and having one surface extending along one lateral edge of said coil and another surface on which said electrical heater means is mounted, and a flange member mounted on said bushing and having one surface extending along another lateral edge of said coil, and self-regulating electrical resistance means mounted on said heat sink means and energizable from an electrical power source upon initiation of said motor operation for heating said heat responsive means.
Dependencies are inferred from the claim text.