TIRE DISCRIMINATION DEVICE AND ITS METHOD, TIRE AIR PRESSURE LOWERING ALARM DEVICE USING THE DISCRIMINATION DEVICE AND ITS METHOD

摘要

PROBLEM TO BE SOLVED: To provide a tire discrimination device capable of preventing a detection omission and false information of tire decompression by discriminating a kind of a tire. SOLUTION: The tire discrimination device to discriminate the kind of the tire in accordance with wheel speed information to be provided from wheels installed on a vehicle is furnished with a rotational speed detection means to detect rotational signals of four wheels, a computing memory means to memorize a wheel speed by computing each of the rotational signals, a decompression determination means to determine lowering of the air pressure of the tire in accordance with a determined value to be computed from the wheel speed of the four wheels and a discrimination means to discriminate the kind of the tire from the magnitude of dispersion of the determined value.