| 摘要 |
A method for detecting decrease of tire air pressure includes detecting each angular velocity of rotation of four tires, judging as to whether the tire air pressure is decreased or not based on the detected angular velocity of rotation, and issuing an alarm. The method includes a judgement step for low velocity in which, when the angular velocity of rotation is detected, judgment is made as to whether the tire air pressure is decreased or not; and a judgement step for high velocity in which, when the angular velocity of rotation is detected, judgment is made as to whether the tire air pressure is decreased or not only when the vehicle velocity is higher than a predetermined threshold value and the vehicle is in driven condition.
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