Before the direction of the roads surfaces state estimation

摘要

Device for the estimation of a road surface condition, comprising:a wheel speed sensor for detecting the wheel rotational speed and for outputting a wheel speed signal;a section for estimating a characteristic size of the wheel speed frequency on the basis of the wheel speed signal, which is a repetition rate of transmission characteristics of a roads disturbance on the wheel rotational speed; anda section for estimating a physical size from the estimated characteristic size of the wheel speed frequency,characterized in that the physical quantity represents the road surface condition.