Fuel control system with fuel metering valve fault accommodation

Details Fuel control system with fuel metering valve fault accommodation Fuel control system with fuel metering valve fault accommodation

1992-06-30

1994-01-18

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

60 39281, F02C 928

Patent

active

052791076

ABSTRACT:
An apparatus is disclosed for a fuel control system of a turbine engine powerplant. Various construction details have been developed which provide means to generate a backup command current for controlling the fuel flow rate to the turbine engine powerplant. In one embodiment, a means to generate a backup command current includes means to convert a fuel flow derivative to a backup command current using known hardware characteristics and an estimated null bias signal. The backup command current is input to a switch along with a command current generated by comparing a reference signal to a feedback signal from a metering valve. The switch responds to means for failure recognition which detects failures in the sensing of the feedback signal. The switch responds to a failure of the feedback signal by inputting the backup command current to a torque motor for controlling a metering valve position.

REFERENCES:
patent: 4032757 (1977-06-01), Eccles
patent: 4397148 (1983-08-01), Stockton et al.
patent: 4794755 (1989-01-01), Hutto et al.
patent: 4821193 (1989-04-01), Barber et al.

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