| 摘要 |
PURPOSE: A pneumatic pressure warning apparatus for a tire of a vehicle is provided to sound an alarm, and to check the state of pneumatic pressure accurately and conveniently during traveling by detecting fluctuation of pneumatic pressure from the tire with measuring the first cavity resonance from noise, averaging and comparing through learning. CONSTITUTION: A pneumatic pressure warning system of a tire is composed of plural noise input units having oriented microphones(10,10',10a,10a') installed in the vehicle bodies in the rear parts of wheels, and converting noise from the tire of the wheel into electric acoustic signals; a control unit(20) comparing the frequency signal of first cavity resonance among acoustic signals from microphones with the predetermined value, and warning the pneumatic pressure state of the tire; and an alarm unit(30) sounding the alarm on change of pneumatic pressure of the tire corresponding to control of the control unit. The pneumatic pressure state of the tire is detected accurately and conveniently by measuring the first cavity resonance, averaging and comparing through learning.
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