PURPOSE: To provide a tire pneumatic pressure judging device capable of detecting the lowering of pneumatic pressure of a tire even under a traveling condition or the like with a large error.
CONSTITUTION: Weight WT is set by a weighting part 62 according to a traveling condition inputted to a traveling condition discriminating means 61. The computed steering angle (relative sensitivity) of front-rear wheel speed difference for the judgment of pneumatic pressure reduction of a tire is changed by a moving average computing means 63 on the basis of the weight WT. Since the relative sensitivity is thus changed according to the traveling condition, the lowering of pneumatic pressure of the tire can be detected even in the traveling state with a large error heretofore out of detection.
NISHIHARA TAKASHI
IKEDA TORU
SHIRAISHI SHIYUUJI
