| 摘要 |
PROBLEM TO BE SOLVED: To judge the air pressure drop of a tyre and change a timing for obtaining a judge result by a vehicular running speed after the count value of a wheel speed pulse reaches a prescribed value. SOLUTION: The air pressure drop of a tyre is judged by a tyre air pressure judging part 32 based on a wheel speed given from ABS control part 31. The value of a deviation S (=(vFR-vFL)-(vRR-vRL)) between the right/left difference of the wheel speed of a front wheel side (vFR-vFL) and the right/left difference of the wheel speed of a rear wheel side (vRR-vRL) is used in this judgement. When respective tyre air pressure of four wheels is normal, S becomes S≈0 and when the air pressure drop is generated in either tyre, S becomes S≠0.
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