| 摘要 |
PURPOSE:To enable the control of a damping force, a spring force and the like of a suspension unit in an optimum state, by removing a low frequency component in the vicinity of 1-2Hz as frequency of a pitching, bounce and the like of a body from signal obtained when the distance to the front road surface is obtained to calculate a road surface condition from residual high frequency components. CONSTITUTION:A beam irradiated ahead of a body through an irradiation lens 12 from an emitter 11 based on the operation of a driving circuit 10 of a distance detector 1 is reflected on a road surface 3 at a specified distance ahead of the body and received with a light position detecting element 14 through a condenser lens 13. Depending on the position of light received by this light position detecting element 14, the distance to the front road surface is calculated utilizing triangulation and a signal corresponding to the results of the calculation is fed to a high pass filter 5. Thus, a low frequency component of below 2Hz is removed from the signal thus fed to the high pass filter 5 leaving a high frequency component alone, a signal of which is fed to a road surface condition calculation circuit 6 where the calculation of the road surface condition is calculated based on the high frequency component alone.
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