| 摘要 |
An apparatus for detecting a longitudinal force of a tire is provided with at least one mark ( 3 ) provided in on one circumferential line (j) in a tire ( 2 ), a first sensor ( 5 ) disposed in a vehicle body side ( 4 ) and capable of detecting a passage of the mark ( 3 ), a second sensor ( 7 ) capable of detecting a rotation angle (theta) of an axle ( 6 ), and a computing means ( 8 ) for computing a longitudinal force (Fr) of the tire ( 2 ) on the basis of an information of the first and second sensors ( 5, 7 ). The computing means ( 8 ) sequentially stores a rotation angle (thetar) of the axle ( 6 ) when the mark ( 3 ) passes through the first sensor ( 5 ). Further, the computing means ( 8 ) computes a tire warp angle (ar) corresponding to a difference (thetao-thetar) between a no-load rotation angle thetao (a rotation angle of the axle ( 6 ) in a no-load state) stored in advance and the rotation angle thetar, and sequentially computes a tire longitudinal force (Fr) of a tire applied during the running from the warp angle (alphar), using a previously determined relational equation F=f(alpha) between the warp angle (alpha) and the tire longitudinal force (F).
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