| 摘要 |
<p>A simple method and apparatus for accurately estimating the contact patch shape of a moving tire. The vibration waveforms of a tire (20) with sipe rows (25A, 25B) formed at the respective pitches (P a , P b ) in the left and right shoulder lands (24a, 24b) are detected by an acceleration sensor attached to a knuckle of the vehicle. Rotational order spectrums are obtained by performing a rotational order analysis on the vibration waveforms. The peak height (Z a ) of the rotational order (n a ) corresponding to the pitch (P a ) and the peak height (Z b ) of the rotational order (n b ) corresponding to the pitch (P b ) are extracted from the rotational order spectrums. The peak height (Z a ) is compared with the threshold value (K a ) to estimate whether the contact patch shape of the tire is longer than the contact patch length (L a ) of the tire contact patch shape (F a ) set as the use limit due to internal pressure drop or load increase, and the peak height (Z b ) is compared with the threshold value (K b ) to estimate whether it is shorter than the contact patch length (L b ) of the tire contact patch shape (F b ) set as the use limit due to internal pressure rise or load decrease.</p> |
