| 摘要 |
The degree of tire wear is estimated with constancy and accuracy even when the road surface becomes rough during a vehicular run. The deformation speeds V tf and V tk of the tread of the tire are obtained respectively by calculating the levels of peaks P f and P k at contact edges appearing in the differentiated waveform of radial acceleration detected by an acceleration sensor 11 installed on the inner surface in the inner liner region of the tire. An average standardized deformation velocity V n t is calculated as the average of the absolute values of leading-edge-side standardized deformation speed V n tf and trailing-edge-side standardized deformation speed V n tk , which are obtained by standardizing the V tf and V tk using the rotation time T r of the tire. At the same time, an extra-contact-patch vibration level v of the tread is detected from the radial acceleration having passed through a bandpass filter 16. And a degree M of tire wear is estimated, using the average standardized deformation speed V n t , the extra-contact-patch vibration level v, and a map 18M. |
