Title: Vehicle speed control

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Abstract: A pneumatically operated speed governor (26) moves an engine throttle member (10) for controlling the speed of a vehicle. The governor includes a pneumatically operated actuator having an output connected to the engine throttle member. A pivotally mounted valve member (44) is positioned intermediate a vacuum supply orifice (46) and an atmospheric air orifice (48) and supplies a pneumatic signal to the actuator. An internal speed sensor (82) responsive to vehicle speed has an output member (100) which reacts against an improved, self-wiping minimum speed switch (102) and a set-speed control member (52) which in turn reacts against the pivotally mounted valve member (44) for varying the position of the valve member as the vehicle speed tends to fall below or rise above a predetermined set speed. An improved feedback lever (194) is connected between an output member of the actuator and the pivotally mounted valve member and has a dual cam profile (198) located about one end thereof which is engageable with a follower surface of the valve member. An improved vacuum release valve (126) is provided which disables the speed governor in its de-energized position.


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