Fuel controller of variable choke carburetor
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNorihiko Nakamura, Takashi Kato
Life of this patent
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Abstract
A fuel controller has a fuel cut-off device in the form of a solenoid valve connected to an intermediate part of an air bleed commmunicating with the well of a variable choke carburetor. The fuel controller also employs a vacuum changeover valve which communicates with the engine intake manifold through a passage way and is connected to the air bleed between the solenoid valve and an air jet upstream of the solenoid valve. The solenoid valve is opened when the engine is decelerating in order to allow the well and the air bleed to communicate with each other, thereby controlling the air-fuel ratio. When the key switch is IC, the air bleed and the vacuum changeover valve communicate with the well, thereby cutting the supply of fuel to the mixing chamber.
Claims5
A fuel controller for a variable-venturi carburetor for preventing engine run-on when the ignition switch is turned off comprising:
- an air-bleed passage provided between a well of said variable-venturi carburetor and an air horn;
- a solenoid-operated valve connected to said air-bleed passage between said well and air horn, said solenoid-operated valve acting to open or close said air bleed passage in response to signals applied to the solenoid;
- and
- a vacuum-changeover valve in communication with said air-bleed passage between said air horn and said solenoid-operated valve, said vacuum-changeover valve being responsive to the intake manifold vacuum and controlled thereby to cut off air from said vacuum-changeover valve to said air-bleed passage during deceleration under a condition of high vacuum in the intake manifold and to introduce air from said vacuum-changeover valve into said air-bleed passage when said intake manifold vacuum is lower than a predetermined value.
Dependencies are inferred from the claim text.