ROAD SURFACE CONDITION ESTIMATION DEVICE

摘要

This road surface condition estimation device comprises a tire-side device (1) and a vehicle-side device (2). The tire-side device is provided with: a vibration detection unit (11) which is attached to the back surface of the tread (31) of a tire (3) mounted on the vehicle, and which outputs a detection signal corresponding to the magnitude of vibration of the tire; a signal processing unit (13) which comprises a ground-contacting segment extraction unit (17) for extracting the ground-contacting segment, which is the portion of the tread contacting the ground in a single rotation of the tire that corresponds to the arrangement position of the vibration detection unit, and a high-frequency level calculation unit (18) which calculates the level of a high-frequency component of the detection signal in the ground-contacting segment; and a transmitter (14) which transmits the calculation result of the level of the high-frequency component as road surface data indicating the road surface condition. The vehicle-side device is provided with a receiver (21) which receives the road surface state data transmitted from the transmitter, and a road surface state estimation unit (22) which, on the basis of the road surface state data, estimates the road surface state of the road surface travelled by the tire.