TIRE WEAR AMOUNT ESTIMATION METHOD AND TIRE WEAR AMOUNT ESTIMATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method and a device capable of accurately and stably estimating wear amount of a tire on a snow road surface.SOLUTION: A differential degree waveform of a tire radial direction acceleration waveform is determined. An operation for calculating a differential peak value on a step-in end side and a differential peak value on a kicking-out end side from the differential degree waveform is repeated multiple times. A differential peak ratio to be a ratio of the differential peak value on the step-in end side to the differential peak value on the kicking-out end side is calculated for each of the obtained step-in end side differential peak value and kicking-out end side differential peak value. One differential peak value of the step-in side differential peak value and the kicking-out side differential peak value which are in the range of a lower limit value 0.6 to 0.8 and an upper limit value 1.0 to 1.2 in the differential peak ratio or an operation value of the step-in side differential peak value and the kicking-out side differential peak value is extracted as a differential peak value for wear estimation. Wear amount of a tire is estimated using the plurality of differential peak values extracted for wear estimation.SELECTED DRAWING: Figure 15