Control device of a variable section nozzle and the implementation method thereof

A device for controlling a variable section ejection nozzle of a turbojet engine nacelle of an aircraft, the device comprising:

• a calculator that determines a theoretical position setpoint of the nozzle based on flight parameters of the aircraft;
• a device configured to actuate the nozzle and associated to said calculator, the device adapted to control a position of the nozzle according to the theoretical position setpoint;
• a measuring device for measuring the position of the nozzle;
• and
• a management system including at least one instantaneous flow rate sensor for measuring an actual flow rate of fuel supplied to a turbojet engine and a management unit, wherein the management unit:
• compares the actual flow rate measured by the at least one instantaneous flow rate sensor with a theoretical flow rate of fuel corresponding to the theoretical position setpoint of the nozzle;
• determines a correction value of the position of the nozzle based on a comparison of the actual flow rate and the theoretical flow rate of fuel;
• and
• corrects a position setpoint of the nozzle according to the correction value such that a difference between the theoretical flow rate and the actual flow rate is reduced to compensate for inaccuracies in the position of the nozzle due to manufacturing tolerance and wear of the nozzle during operation.