초록 ▼

In a propeller pitch control system, a selector 10 isolates engine (42) speed control in one of two engine governor (175 and 300) systems. The selector is input with fluid pressure signals from a pair of pilot valves (215 and 325), each operated by a corresponding one of the governors. The selector

In a propeller pitch control system, a selector 10 isolates engine (42) speed control in one of two engine governor (175 and 300) systems. The selector is input with fluid pressure signals from a pair of pilot valves (215 and 325), each operated by a corresponding one of the governors. The selector passes the signal of lowest magnitude to an actuator 40 which sets blade pitch in accordance with the magnitude of the signal whereby the governor providing such signal (through its associated pilot valve) controls engine speed independently of the other governor.

대표청구항 ▼

A pitch control system for a variable pitch propeller powered by an engine, said pitch control system including an actuator connected to the blades of said propeller for movement thereof in pitch change directions; said pitch control system being characterized by: an engine speed governor; first sig

A pitch control system for a variable pitch propeller powered by an engine, said pitch control system including an actuator connected to the blades of said propeller for movement thereof in pitch change directions; said pitch control system being characterized by: an engine speed governor; first signal means for establishing a first variable control signal indicative of a desired pitch setting; means operatively connecting said engine speed governor to said first signal means for setting said first signal means in response to the output of said engine speed governor under normal engine operating speeds; a backup governor; second signal means for establishing a second variable control signal indicative of a desired pitch setting; means operatively connecting said backup governor to said second signal means for setting said second signal means in response to said backup governor under engine overspeed conditions; connection means connecting said first and second signal means to said actuator for application of said first and second control signals thereto from said first and second signal means; and said connection means including control means responsive to said first and second control signals, for isolating said first and second control signals from one another and passing a single one of said control signals to said actuator in response to the relative magnitude of said control signals.