Patent ID: 7104053

Claim:
A method for controlling the operation of a hybrid actuation system comprising first and second actuator arrangements ( 10 , 12 ) for applying first and second output loads respectively to a common element ( 14 ), the method comprising: supplying first and second demand signals to the first and second actuator arrangements ( 10 , 12 ) respectively to cause movement of the common element ( 14 ) into a demanded position, monitoring the first and second output loads applied by the first and second actuator arrangements ( 10 , 12 ) and generating an output signal indicative of the difference between the first and second output loads, and correcting the first and second demand signals in response to the output signal to compensate for any difference between the first and second output loads, thereby to ensure the first and second output loads applied to the common element ( 14 ) are substantially identical and synchronised.