Fault detecting method for piezoelectric actuator, involves measuring oscillation amplitude of excited oscillating circuit, and detecting fault if measured oscillation amplitude differs from set oscillation amplitude

摘要

The method involves exciting oscillating circuit using an impulsive signal, and measuring amplitude of oscillation of the circuit. A fault in a piezoelectric actuator (1) is detected if the measured amplitude differs from set amplitude of oscillation. The amplitude of the oscillation is defined as number of oscillations inside a predefined time window. An independent claim is also included for a piezoelectric actuator system.