Patent ID: 7918131

Claim:
A tire slip state detecting method for detecting a slip state in a contact region of a tire which is rotating on a road surface, the method comprising: an acquiring step for acquiring measurement data of acceleration at a tread portion of the rotating tire for a duration corresponding to at least one round of tire rotation, the measurement data including at least measurement data of acceleration in a radial direction of the tire; a contact region determining step including, extracting time series data of acceleration due to tire deformation from the acquired measurement data in the radial direction, subjecting the time series data of acceleration due to tire deformation to a time integration of second order to obtain displacement data, thereby calculating a deformation in the tread portion of the tire, and determining, from the calculated deformation, a contact region of the tire during rotation; a slip region specifying step for specifying, from the measurement data of acceleration acquired in the acquiring step, a slip region within the determined contact region.