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US 4,304,201 AGranted
Method and apparatus for step positioning an engine speed control
AssigneeCTS Corporation
InventorWilliam F. Bleeke
Life of this patent
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AssigneeCTS Corporation
InventorWilliam F. Bleeke
Estimating the term…
A multi-stage latching device for a carburetor which controls the idle speed by defining various throttle plate positions according to deceleration sensor switch, air conditioning switch and ignition switch states. The mechanism which moves the throttle plate consists of a primary force coil which energizes an armature against spring return and the position of the armature coupled through a shaft establishes the idle speed. The throttle position is determined by any one of three adjustably disposed latch coils which when energized, magnetically couple to a casing to define a stop. A circuit control associated with each latch deenergizes the primary force coil while maintaining the magnetic coupling of the stop. With primary force off, the return spring forces the armature back against the energized stop and hence establishes the throttle position and idle speed.
An apparatus for selectively positioning a control device, comprising a housing, a positioning coil, a movable armature displaceable within said housing responsive to the energization of said positioning coil and including means forming a mechanical connection with the control device, a plurality of positioning means operatively secured to said armature and disposed circumferentially relative thereto within said housing, a holding coil operatively associated with each said circumferentially disposed positioning means and including locking means actuated upon energization of said holding coil to form a magnetic coupling with said housing thereby retaining the associated circumferentially disposed positioning means and maintaining said armature at a longitudinal position within said housing, means selectively actuating said holding coils and positioning coil to effect longitudinal positions of the armature and positioning means, and means for deactuating said positioning coil when a locking means has formed a magnetic coupling with said housing.
A process for defining the idle position of a throttle responsively to various conditions such as idle speed with substantial power demand, ignition, deceleration, and full stop, comprising the steps of mechanically displacing a shaft through an armature responsive to a primary force coil, opposing such movement of the armature with a resilient biasing means, selectively defining mechanical displacement positions of said armature by forming transient magnetic/mechanical couplings between one of a plurality of latching means and the interior surface of a casing through selective energization of latch coils associated therewith, and switch means responsive to the displacement of said latching means by said latch coil to effect deenergization of said primary force coil whereby the armature is thereafter held in a displacement position defined by a latching means of one of said latch coils against the retraction movement of said resilient biasing means, and controlling the engine speed responsively to the position of the shaft displaced by said armature.
Dependencies are inferred from the claim text.