Tire device

A tire device for determining a road surface condition of a vehicle's traveling road surface and detecting a tire wear state, comprising:

• a tire side device provided on a tire side;
• and
• a vehicle body side system provided on a vehicle body side, wherein
• the tire side device includes
• a vibration detection unit configured to output a detection signal corresponding to a magnitude of vibration of a tire,
• a control unit having a feature amount extraction part configured to extract a feature amount for each frequency band from the detection signal during one rotation of the tire, and
• a first data communication unit configured to transmit a road surface data including the feature amount extracted by the feature amount extraction part,
• the vehicle body side system includes
• a second data communication unit configured to receive the road surface data transmitted from the first data communication unit,
• a road surface determination part configured to determine the road surface condition of the traveling road surface based on the road surface data,
• an integral calculation part configured to calculate an integral value of the feature amount in a specific frequency band using the feature amount for each frequency band included in the road surface data, and
• a wear determination part configured to detect the tire wear state based on the integral value of the feature amount,
• the road surface determination part is further configured to determine the road surface condition of the traveling road surface based on the feature amount for each frequency band included in the road surface data, and
• the integral calculation part is further configured to calculate the integral value of the feature amount in the specific frequency band using the same road surface data as used when the road surface condition is determined by the road surface determination part, and the feature amount for each frequency band included in the road surface data.