TIRE PNEUMATIC PRESSURE DETECTOR

摘要

A tire pneumatic pressure detector capable of accurately detecting the lowering of a tire pneumatic pressure even if there is the effect by a tread lift, wherein a pneumatic pressure reduction rate is obtained from the variation of a post-correction wheel speed deviation D'AVE per unit time, a predicted warning time when the wheel speed deviation D'AVE exceeds a warning threshold level is calculated from the pneumatic pressure reduction rate and, when the predicted warning time comes, the lowering of the tire pneumatic pressure is detected irrespective of the actual wheel speed deviation D'AVE, whereby, even if a vehicle speed is increased and the post-correction wheel speed deviation D'AVE is changed to a side where the tire pneumatic pressure is not lowered by the effect of the tread lift in the course of the lowering of the pneumatic pressure, the lowering of the tire pneumatic pressure can be detected accurately when the predicted warning time comes.