Throttle positioner
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsShinzo Kobuki, Masaru Hase
Life of this patent
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Abstract
A throttle positioner adapted to be operated by an intake vacuum system to maintain a throttle valve at a throttle opening position for a predetermined time when an accelerating pedal has been released while an automobile is running, wherein a vacuum control valve is provided to selectively nullify said intake vacuum operating system as long as the rotational speed of an engine is above a predetermined level, said vacuum control valve being controlled by delivery air pressure of an air pump driven by the engine.
Claims5
A throttle positioner comprising a port to detect intake vacuum, a diaphragm means, a conduit means which connects said port and a diaphragm chamber of said diaphragm means, said conduit means including a means to delay transmission of vacuum, a throttle positioning lever adapted to be driven by said diaphragm means so as to rotate between first and second rotary positions, and a throttle driving lever mounted on a rotary shaft of a throttle valve and adapted to engage a tip of said throttle positioning lever so as to hold return of the throttle valve at a predetermined opening position when said throttle positioning lever is in said first rotary position while disengaging from said tip of said throttle positioning lever so as to permit full return of the throttle valve to an idling position when said throttle positioning lever is in said second rotary position, the improvement which comprises a vacuum control valve which selectively opens an intermediate portion of said conduit means to the atmosphere, said vacuum control valve being controlled by delivery air pressure of an air pump driven by an engine so as to open when the air pressure is above a predetermined level.
Dependencies are inferred from the claim text.