Patent ID: 6568166
Filing Date: 2003-05-27
Classification: F02C

Abstract:
A back-up system for controlling a turbo-machine via a fuel metering unit when a main electronic engine control of the turbo-machine fails and which comprises;a back-up burn fuel flow calculator, said back-up fuel flow calculator receiving at least the amount of fuel requested by an operator signal of the turbo-machine and the actual spool speed of the turbo-machine and computing an amount of fuel to provide to said turbo-machine in order to adjust its speed to obtain a spool speed equivalent to said amount of fuel requested by the operator signal; a last burn fuel flow storage, said last burn fuel flow storage storing the last burn fuel flow value provided by said main electronic engine control before its failure; and a transitional burn fuel flow manager, said transitional burn fuel flow manager receiving the amount of fuel computed by said back-up burn fuel flow calculator and said last burn fuel flow value stored in said storage and providing a transitional amount of fuel to said fuel metering unit.