Fuel control system with fuel metering valve fault accommodation
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United States of America Patent
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-
Jan 18, 1994
Grant Date -
N/A
app pub date -
Jun 30, 1992
filing date -
Jun 30, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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