Road surface state estimation method, road surface state estimation tire, road surface state estimation device, and vehicle control device

摘要

The road surface condition estimation tire 10 including the acceleration sensor 11 and the signal processing device 12 detects the vibration in the circumferential direction or the width direction of the traveling tire 10 and uses the detected vibration waveform data before the depression. After dividing the data into three areas, the area, the contact surface area, and the area after kicking out, the vibration level of the pre-stepping area and the contact surface area are extracted, and the vibration component in the low frequency band is extracted from the vibration level of each area. And a vibration component in the high-frequency band are extracted, and a vibration level ratio R that is a ratio thereof is calculated, and the calculated vibration level ratio R and the tire vibration stored in the storage means 32 are calculated on the vehicle body side. By estimating the road surface state where the vehicle is traveling based on the map 32M showing the relationship between the vibration level ratio R and the road surface state, the road surface state can be determined even when there is a change in temperature or speed. And to be able to be estimated every time.