Idle speed control actuator

Details Idle speed control actuator Idle speed control actuator

F - Mech Eng,Light,Heat,Weapons

02

D

123/85

F02D 11/08 (2006.01) F02M 3/06 (2006.01)

Patent

CA 1123693

IDLE SPEED CONTROL ACTUATOR ABSTRACT OF THE DISCLOSURE An idle speed control actuator is used to maintain a constant vehicle engine idle speed in response to variations of the load on the vehicle engine. The actuator responds almost immediately to an increase in the load on the engine to prevent the engine from stalling, but reduces idle speed slowly when the load on the engine is reduced during idle conditions or when the throttle control lever is returned to the idle position so that the actuator does not have to "hunt" for the proper engine idle speed. The actuator includes a control plunger which is engaged by the throttle lever when the latter is returned to its engine idle position, so that the position of the throttle lever, and, accordingly, the opening of the carburetor butterfly valve which sets the engine idle speed, is varied in accordance with the position of the plunger. The plunger is positioned by a differential pressure responsive diaphragm, which is responsive to the pressure differential between engine manifold vacuum and ambient atmospheric pressure. Since the engine manifold vacuum varies in accordance with the load on the engine for a given throttle setting, the diaphragm responds accordingly to move the plunger to the proper setting. Since the throttle lever engages the plunger during the engine idle condition, the proper setting of the plunger will also properly position the throttle lever to establish the correct engine idle speed.

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