Patent ID: 11873771
Assignee: GE AVIO S.R.L.
Field: Transport (Mechanical engineering)
Classification: CPC B  F  Y | IPC B  F

Claim 9:
10. A method for controlling a variable pitch propeller assembly driven by a powerplant, the method comprising:
operating the powerplant;
controlling, using a controller, a first electrohydraulic servovalve adjustable between a constant speed mode, a feather mode, and a reverse mode to selectively allow a controlled amount of hydraulic fluid to or from a pitch actuation assembly of the variable pitch propeller assembly; and
selectively diverting, during an oil starvation condition, hydraulic fluid from a propeller dome of the variable pitch propeller assembly via a one-way valve, the one-way valve having an inlet fluidly coupled to the propeller dome and an outlet fluidly coupled to an inlet port of a second electrohydraulic servovalve and, wherein, during an oil starvation condition, the one-way valve in an open position to supply hydraulic fluid from the propeller dome to the inlet port of the second electrohydraulic servovalve, when an oil starvation condition is not present, the one-way valve in a closed position to not supply hydraulic fluid from the propeller dome to the inlet port of the second electrohydraulic servovalve.