Precision Governors, Inc.

Barber Colman Company

Hal G Meyer

William J Barrett

The governor of the invention consists of an output solenoid having a plunger operatively connected to the mechanism to be controlled. The output solenoid is a 'bang-bang' type such that full power or no power is delivered to the solenoid even for small errors between the desired operating condition and actual condition of the mechanism to be controlled. The output solenoid is connected in a hydraulic circuit with a control solenoid having a control valve such that the movement of the fluid through this circuit is regulated by the control solenoid. The control solenoid is of the proportional type such that the control valve's position is directly related to the difference between the actual operating condition and the desired operating condition of the mechanism to be controlled. A position sensor is provided on the output plunger to provide feedback to the controller such that as the output plunger approaches the desired position the control valve will gradually begin to close to thereby decrease the speed of movement of the output plunger to avoid overshoot of the desired position. Once the output plunger is in the desired position and the control valve is closed the output plunger is locked in position such that the power delivered to the coil of the output solenoid can be maintained at an intermediate level.

Electro-hydraulic control system for governors

A rotary actuator is disclosed useful in controlling throttle settings on internal combustion engines. The angular displacement of the actuator shaft is a function of the current applied to the actuator. In the disclosed embodiment the relationship between current and angular displacement has three distinct regions: increasing displacement, linear displacement and decreasing displacement with respect to applied current. These regions are matched to the engine characteristics to produce a desired response from the engine. The actuator consists of a rotor biased by a coil spring to a first position and displaceable to a plurality of intermediate positions by magnetic actuation from pole pieces associated with current carrying coils. The arrangement and configuration of the rotor and pole pieces produce the desired three region response characteristic.

Rotary actuator with selectable response characteristics

An actuating device is disclosed which is modular in construction. The device employs a modular head having a rotatable output shaft for controlling valves, etc. One or more force motors are arranged to actuate the output shaft according to the required application. The force motors are electromagnetic and can accurately position the output shaft as a function of applied current.

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Rockford, IL, United States of America

Hal G Meyer