Gas turbine engine fuel control thrust control override system

摘要

A gas turbine engine fuel control system is provided that includes a fuel metering valve and a thrust control valve. The fuel metering valve includes a metering valve inlet and a metering valve outlet. The metering valve inlet is adapted to receive a flow of fuel, and is configured to control the flow of fuel through the metering valve outlet. The thrust control valve is adapted to receive thrust control valve override signals and is configured, in response thereto, to move from a first position, in which flow from the metering valve is not impacted, and a second position, in which flow from the metering valve is blocked while flow through a fixed-area orifice is allowed.

主权项

1. A gas turbine engine fuel control system, comprising:
a fuel metering valve comprising a metering valve inlet and a metering valve outlet, the metering valve inlet adapted to receive a flow of fuel, the fuel metering valve further adapted to receive fuel flow command signals and configured, in response thereto, to control the flow of fuel through the metering valve outlet; and a thrust control valve adapted to receive thrust control valve override signals and configured, in response thereto, to move from a first position to a second position, the thrust control valve comprising:
a valve body having a main inlet, an override inlet, a valve control pressure inlet port, a bypass outlet port, and a thrust control valve outlet, the main inlet in fluid communication with the metering valve outlet, the override inlet in fluid communication with the metering valve inlet,a thrust control valve element disposed within the valve body and movable between the first position and the second position;a proportional bypass valve element disposed within the valve body, the proportional bypass valve element movable with, and selectively movable relative to, the thrust control valve element, to thereby selectively place the bypass outlet port in fluid communication with the override inlet; andan actuator element coupled to receive the thrust control valve override signals and configured, in response thereto, to move between a high-pressure position and a low-pressure position,wherein:
in the first position, the thrust control valve outlet is in fluid communication with the main inlet and fluidly isolated from the override inlet,in the second position, the thrust control valve outlet is in fluid communication with the override inlet and fluidly isolated from the main inlet,in the high-pressure position, the valve control pressure inlet port is adapted to receive fluid at a first pressure magnitude, to thereby move the thrust control valve element to the first position, andin the low-pressure position, the valve control pressure inlet port is adapted to receive fluid at a second pressure magnitude, the second pressure lower than the first pressure magnitude, to thereby move the thrust control valve element to the second position.