METHOD FOR DIFFERENTIATING CONTROL FAILURES IN A SYSTEM FOR CONTROLLING AN ACTUATOR, IN PARTICULAR OF A STATOR OF A GAS-TURBINE ENGINE

摘要

The present invention relates to a method for differentiating control failures in a system for controlling an actuator (14) determining the position of a member for modifying the state of a gas-turbine engine, the system including a single- or dual-channel electric control and a mechanical control, the electric control including one computer (10, 10′) per channel, only one of which is active at any given time in order to calculate the set position of the movable member of the actuator (14) and to transmit a set signal to the single-channel mechanical control of the actuator, a failure being diagnosed when a deviation is detected between the set position of the movable member of the actuator and the position thereof measured during a predetermined deviation confirmation time. The method is characterised in that the speed of movement of the actuator is measured and in that the system diagnoses an electrical failure when, during said time for confirming the deviation, the measured speed of movement is other than zero and remains higher than a predetermined threshold speed; otherwise, the failure is diagnosed as being of temporary mechanical origin.

主权项

1. Method for differentiating control faults in a system controlling an actuator acting on the position of a member modifying the state of a gas turbine engine, the system comprising an electrical control and a mechanical control, the electrical control comprising at least one computer for calculating the desired position of the movable member of the actuator and transmitting an instruction signal to the single-channel mechanical control of the actuator, a fault being diagnosed when a difference is detected between the desired position of the movable member of the actuator and its measured position for a given difference-confirmation period, characterised by the fact that the speed of movement of the actuator is measured and a fault of electrical origin is diagnosed when, during said difference-confirmation period, the speed of movement measured remains zero or above a predetermined threshold speed, otherwise the fault is of temporary mechanical origin.