Patent ID: 7690355

Claim:
A fuel metering system for supplying fuel to a plurality of loads, comprising: a gas turbine engine controller operable to supply fuel flow commands; a variable displacement piston pump including an adjustable hanger that is movable to a plurality of positions, the variable displacement piston pump configured to receive a drive torque and, upon receipt of the drive torque, to supply fuel to the plurality of loads at a flow rate dependent on drive speed and the position of the adjustable hanger; a hanger actuator coupled to receive hanger position commands and operable, in response thereto, to move the adjustable hanger to the commanded position; a metering valve disposed between the variable displacement piston pump and at least one of the plurality of loads, the metering valve including a variable area flow orifice; a metering valve actuator coupled to receive the fuel flow commands and operable, in response thereto, to adjust the variable area flow orifice; and a head sensor configured to sense differential pressure across the metering valve and operable, based on the sensed differential pressure, to supply the hanger position commands.