| 摘要 |
PROBLEM TO BE SOLVED: To improve the traveling safety of a vehicle by estimating the condition of a road surface with a tire brought into contact therewith and the tire traveling condition when the vehicle is traveling at a constant speed without any operations such as braking, driving, and steering. SOLUTION: The vibration information signal of a wheel detected by an acceleration sensor 11 fitted to a wheel rim of the wheel is frequency-analyzed by a frequency analyzing means 14, the vibration level of the vibration spectrum is detected, and the coefficient of frictionμof the road surface is estimated by comparing the detected vibration level with the G-table 15G indicating the relationship between the coefficient of frictionμof the road surface stored in a vibration level storing means 15 and the vibration level by a road surface condition and tire traveling condition estimating means 16. COPYRIGHT: (C)2003,JPO
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