Tire sensor

A tire wear state estimation system comprising:

• at least one tire supporting a vehicle;
• a tri-axial sensor affixed to the tire operative to measure a tire cavity pressure and transmit tire inflation pressure data;
• and
• tire-specific identification data stored within, and accessible from, the tri-axial sensor, the tri-axial sensor measuring tire vertical mode frequency and generating tire vertical mode frequency data, generating tire-specific frequency mode coefficients using the tire-specific identification data and on-vehicle or in-tire measurement of a tire vertical mode frequency, and calculating an estimation of a tire wear state based upon tire inflation pressure data, tire vertical mode frequency data, and tire-specific frequency mode coefficients.

A method of tire wear state estimation comprising:

• affixing a tri-axial sensor to a vehicle-supporting tire, the tri-axial sensor measuring a tire cavity inflation pressure and generating tire inflation pressure data;
• measuring tire vertical mode frequency and generating tire vertical mode frequency data;
• generating tire-specific frequency mode coefficients using tire-specific identification data;
• and
• calculating an estimation of a tire wear state based upon the tire inflation pressure data, vertical mode frequency data, and tire-specific frequency mode coefficients.