A rotation angle velocity is acquired in each of a two-wheel high pressure state and a reference state of air pressures of respective four wheels, and a rotation angle velocity value and a resonant frequency are acquired. The rotation angle velocity value, etc, acquired in the two-wheel high pressure state and the rotation angle velocity value, etc, acquired in the reference state are compared with each other. When these values are generally equal to each other, it is determined that at least one of the values is not appropriate for the determination of the malfunction determination threshold value, and a preset value is determined to be used as the malfunction determination threshold value. When these values are different from each other, the malfunction determination threshold value is determined. The determination of the malfunction determination threshold value to an inappropriate value is thus avoided, reliably monitoring the air pressures.
AIR-PRESSURE MONITORING DEVICE AND MALFUNCTION-DETERMINATION-THRESHOLD-VALUE DETERMINATION METHOD
2015-10-22
Patent
Elektronische Ressource
Englisch
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