Tire burst prediction device

摘要

A tire burst predicting device which can predict occurrence of bursting of a tire and gives an alarm properly is provided. Break point frequency estimating means 44 estimates a break point frequency on the basis of time series data of wheel speed detected at a wheel speed sensor 32 from frequency response of a first order model to which a transmission characteristic from a road surface disturbance to a wheel speed is approximated. Braking force gradient estimating means estimates a braking force gradient corresponding to the estimated break point frequency, on the basis of a map, which is prestored, representing a relationship between break point frequencies and braking force gradients. Extra high frequency component is eliminated from the estimated braking force gradient by a low pass filter 48 to reduce estimation dispersion. Differentiators 50 detect changing speed of the braking force gradient. Judging means gives an alarm of that there is a possibility of occurrence of bursting of tire in a case in which the detected changing speed is equal to or more than a predetermined threshold value.