| 摘要 |
The dynamic state amount of a tire when a load is applied to the tire while running can be estimated accurately and stably by installing tire deformation amount measuring means 11 A and 11 B at axisymmetrical positions which are equally distant in the axial direction from the center in the axial direction of the tire on the cross-section in the radial direction of the tire on the inner side of the belt portion of a tire tread in the radial direction, such as at the inner surface of the tread, between an inner liner and a ply, between plies or between a ply and a belt to measure the waveforms of deformation of the tire, detecting the contact time which is the time difference between contact edges from the waveforms of deformation, calculating contact length indices k<SUB>A </SUB>and k<SUB>B </SUB> from the contact time and the wheel speed detected by a wheel speed sensor 15 , calculating the average value k of the above indices k<SUB>A </SUB>and k<SUB>B</SUB>, and obtaining a load applied to the tire by using the calculated average value k of the indices of contact length and a map 18 M showing the relationship between the average value of the indices of contact length and load pre-stored in memory means 18.
|
