Fuel control apparatus for a gas turbine engine
First Claim
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1. A backup arrangement for a fuel control apparatus which meters fuel to a gas turbine engine in response to an electrical signal indicative of a desired fuel/air ratio of the engine comprising:
- a metering valve, positioned by a hydraulic control pressure, whose position is indicative of the fuel flow therethrough; and
means for modulating the hydraulic control pressure by means of an electrical control and a manual control;
said electrical control comprising a means for positioning said modulating means over a predetermined electrical control range, said manual control including means for positioning said modulating means over a predetermined manual control range, wherein said manual control range is related to said electrical control range such that upon failure of the electrical control the modulating means automatically fails to a position controlled by the manual control.
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Abstract
A fuel control apparatus (34) for a gas turbine engine (10). The fuel control apparatus (34) meters fuel flow Wf according to an electrical signal (Wf/Pc, E) indicative of the desired fuel/air ratio of the engine as scheduled from the power lever angle (PLA) by a closed loop acceleration based electronic governor (26). The apparatus (34) mechanically multiplies the electrical signal (Wf/Pc, E) by the compressor discharge pressure (Pc) of the engine (10) to yield the fuel flow (Wf).
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16 Claims
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1. A backup arrangement for a fuel control apparatus which meters fuel to a gas turbine engine in response to an electrical signal indicative of a desired fuel/air ratio of the engine comprising:
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a metering valve, positioned by a hydraulic control pressure, whose position is indicative of the fuel flow therethrough; and means for modulating the hydraulic control pressure by means of an electrical control and a manual control;
said electrical control comprising a means for positioning said modulating means over a predetermined electrical control range, said manual control including means for positioning said modulating means over a predetermined manual control range, wherein said manual control range is related to said electrical control range such that upon failure of the electrical control the modulating means automatically fails to a position controlled by the manual control. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification