| 摘要 |
PROBLEM TO BE SOLVED: To provide a tire air pressure control device capable of determining any abnormal air leakage in an air pressure circuit without using any pressure sensor. SOLUTION: The tire air pressure control device comprises an air pump AP which is driven by the rotation of a wheel B to feed compressed air into a tire air chamber Rb, a valve state detection sensor (a stroke sensor S1) which has a mechanical control valve device VA to permit or prohibit the feed of compressed air from the air pump AP to the tire air chamber Rb to detect the state of the control valve device VA, a wheel speed sensor S2 to detect the rotational speed of the wheel B, and an electric control device ECU. The electric control device ECU comprises a total discharge air volume calculating means for calculating the total discharge air volume of compressed air to be fed from the air pump AP to the tire air chamber Rb during the permissible maintenance time when the control valve device VA is in a permissible state, and an average air leakage volume calculating means for calculating the average air leakage volume per unit time in one cycle from the time when the control valve device VA is in a prohibited state, a permissible state, and then, a prohibited state again. COPYRIGHT: (C)2008,JPO&INPIT
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