Patent ID: 11933224
Assignee: SAFRAN AIRCRAFT ENGINES
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A fuel feed control and protection system for an aircraft engine of an aircraft, comprising
an engine control computer generating a fuel mass flow rate setpoint, and
a fuel metering unit for the aircraft engine, comprising
a metering member configured to receive a control signal and to meter a fuel feed of the aircraft engine depending on said control signal;
a cutoff member configured to cut off the fuel feed of the aircraft engine;
wherein the aircraft is divided into fire zones, comprising compartments of the aircraft which contain sources of ignition and/or the risk of leakage of flammable liquids, and a fire-free zone, comprising parts of the aircraft not in the fire zones;
the fuel metering unit is installed in a first fire zone of the aircraft, and the engine control computer is installed in a second fire zone of the aircraft distinct from the first fire zone;
the fuel metering unit further comprises a protection and cutoff computer of the aircraft engine, configured to:
receive data allowing evaluating an instantaneous value of an engine speed;
compare the instantaneous value of the engine speed to a predefined aircraft engine speed threshold value and determine a possible overspeed state on the basis of this comparison; and
transmit a control signal to a cutoff control member contained in the cutoff member to cut off the fuel feed of the aircraft engine if an overspeed state of the engine speed is determined.