Method for monitoring a status of a tyre

A system for monitoring a status of a tyre fitted on a vehicle, the system comprising:

• a motion sensor fixed at a crown portion of the tyre to detect a motion of the crown portion of the tyre;
• a memory storing instructions;
• and
• at least one processing unit in communication with the motion sensor configured to execute the instructions to:
• in a first operative phase with the tyre in a reference status:
• during an advancement of the vehicle, acquire at least one first signal representative of a motion of the crown portion of the tyre;
• obtain a first frequency spectrum of the at least one first signal, the first frequency spectrum comprising a first plurality of peaks;
• identify a first determined peak in the first plurality of peaks and determining a first frequency of the first determined peak;
• and
• in a second operative phase subsequent to the first operative phase:
• during an advancement of the vehicle, acquire a second signal representative of the motion of the crown portion;
• obtain a second frequency spectrum of the second signal, the second frequency spectrum comprising a second plurality of peaks;
• identify a second determined peak in the second plurality of peaks corresponding to the first determined peak in the first plurality of peaks, and determining a second frequency of the second determined peak;
• determine a reference frequency as a function of the first frequency of the first determined peak;
• determine a current frequency as a function of the second frequency of the second determined peak;
• and
• monitor the status of the tyre based on a comparison between the current frequency and the reference frequency, or between two values of a same physical quantity, wherein the two values are correlated to the current frequency and to the reference frequency respectively, and wherein the physical quantity is a mass or a moment of inertia, or a stiffness of the tyre.