Method for controlling an actuator and associated control by changing to open loop control when redundant sensors are not in agreement

A method of controlling an actuator comprising a movable element, the method comprising:

• receiving a setpoint signal, a first position measurement signal of the movable element acquired by a first position sensor and a second position measurement signal of the movable element acquired by a second position sensor different from the first position sensor;
• calculating a deviation between the first position measurement signal and the second position measurement signal;
• and
• generating a control signal for controlling a displacement of the movable element from the set-point signal and from at least one of the first position measurement signal and the second position measurement signal;
• when the deviation between the position measurement signals exceeds a predetermined threshold, the method further comprises:
• setting the control signal in open loop at a constant value selected independently of the first position measurement signal and the second position measurement signal so as to immobilize the movable element;
• calculating a first position interval associated with the first position measurement signal and a second position interval associated with the second position measurement signal, wherein the first position interval has a length greater than a resolution of the first position sensor or the second position interval has a length greater than a resolution of the second position sensor;
• and
• detecting that a first value of the first position measurement signal is outside the first position interval or that a second value of the second position measurement signal is outside the second position interval, while the control signal is fixed at the constant value.