To evaluate accurately the traveling condition of a vehicle, with respect to the slippage on the contact area between a tire and a road surface which varies at each moment, during the steering of an automotive vehicle.
Acceleration data at a predetermined position of the tire, produced by the tire-receiving external force from the road surface, while the vehicle travels on the road surface are acquired in time series. A spectrum of the acceleration is obtained by performing frequency analysis on the time series acceleration data. The peak value in the frequency range of 500-1,500 Hz, corresponding to the frequency of a squealing noise produced by the tire, is detected, and the traveling safety of the vehicle is evaluated, according to the peak value detected.
MATSUDA ATSUSHI
MIYASHITA NAOSHI
Haruko Sanwa
Next Patent: METHOD AND DEVICE FOR DETECTING OBJECT