Patent ID: 7583200
Filing Date: 2009-09-01
Classification: F02D,G01M,G01P

Abstract:
1. A method of detecting variations of a speed (R) of a rotor said method comprising the steps of, in real time: measuring signals representative of a march-past of teeth of a measurement device secured to the rotor for a determined duration (T), sampling, digitizing and storing the signals to obtain an initial digital vector (B), extracting from the initial vector (B) a detection signal around a known disturbing frequency (F), wherein said extracting of said detection signal comprises calculating a temporal evolution R(t) of the speed (R) of the rotor, and analyzing in real time said temporal evolution R(t) comprises applying a Fast Fourier Transform to said temporal evolution R(t), analyzing in real time said temporal evolution R(t) of the speed (R) of the rotor with a bandpass filter of a digital signal processing module, said analyzing further comprising comparing the detection signal with a predetermined threshold and delivering an alert message in the event of overshoot.