| 摘要 |
PURPOSE: To monitor the abrasion, cushioning capacity and balance state of the ground surface of a tire and the rotational speed of a wheel. CONSTITUTION: A processor 8 performs the fast Fourier transform of accelerations in the radial direction and horizontal direction of a tire on the basis of the acceleration of the radial direction and horizontal direction of the tire detected by sensors 2, 4, in order to monitor the abrasion of the ground surface of the tire to determine resonance frequency in a range of 30-60 Hz. The determined resonance frequency is compared with reference resonance frequency showing that there is no abrasion at all and, when there is frequency displacement, it is determined that there is abrasion. Cushioning capacity is in a 0.5-2.0 Hz range and the balance state of the tire is in a 5-14 Hz range and the rotational speed of a wheel is in a 0-25 Hz range and frequency shift is detected. When there is predetermined shift or more, a transmission circuit 16 transmits a warning signal to a vehicle to display the same on a display.
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