Patent ID: 8319621

Claim:
A vehicle having a driven wheel and a driving wheel to which tires are attached, comprising: a revolution speed detector for detecting revolution speeds of the driven wheel and the driving wheel and outputting detected revolution speed data; a wheel speed detector for detecting wheel speeds of the driven wheel and the driving wheel based on the detected revolution speed data of the driven wheel and the driving wheel and outputting the detected wheel speed data; a wheel speed ratio detector for detecting a wheel speed ratio between the detected wheel speed of the driven wheel and the detected wheel speed of the driving wheel based on the detected wheel speed data of the driven wheel and the driving wheel; a tire condition evaluator for outputting an evaluation result indicating that the tire attached to the driven wheel or the driving wheel is worn or the tires attached to the driven wheel and the driving wheel are worn, when a frequency of the wheel speed ratio exceeding a prescribed range is higher than a preset threshold; a payload detector for detecting a payload; and a wear detection count threshold calculator for outputting the threshold; wherein the wear detection count threshold calculator adjusts the threshold according to detected payload data outputted by the payload detector.