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US 8,942,861 B2Granted
Road surface condition estimation method, and road surface condition estimation apparatus
AssigneeBridgestone Corporation
InventorYasumichi Wakao
Life of this patent
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AssigneeBridgestone Corporation
InventorYasumichi Wakao
Estimating the term…
The invention provides a method and apparatus capable of accurately estimating a road surface condition under a traveling vehicle using unsprung acceleration and wheel speed data. The unsprung fore-aft acceleration (Gx) is detected by an acceleration sensor (11) attached to a knuckle (31) which is an unsprung component of a vehicle. At the same time, the wheel speed (Vw) is detected and the variation (ΔVw) in wheel speed is calculated. Then the fluctuation range (σ(ΔVw)) of the variation in wheel speed and the fluctuation range (σ(Gx)) of the unsprung fore-aft acceleration are calculated. And whether the road surface is a rough road surface with some bumpiness or a flat (smooth) road surface is estimated from a relationship between the fluctuation range (σ(ΔVw)) of the variation in wheel speed and the fluctuation range (σ(Gx)) of the unsprung fore-aft acceleration.
A method for estimating a road surface condition, comprising the steps of:
A road surface condition estimating apparatus comprising:
Dependencies are inferred from the claim text.