Being the presumption method of presuming front and back power, the lateral force and the top and bottom power which operate

摘要

PPROBLEM TO BE SOLVED: To improve the estimation accuracy of the longitudinal force, the lateral force and the vertical force to be applied to a tire. PSOLUTION: Three or more (n-sets of) sensor units G are mounted on a side wall part 3a on one side. Each sensor unit G comprises a first strain sensor 10A in which the maximum gain line K1 is inclined to one side of the tire circumferential direction at the angle θ1 of 20-70° with respect to the tire radial direction, and a second strain sensor 10B in which the maximum gain line K2 is inclined to the other side of the tire circumferential direction at the angle θ2 of 20-70°. The first and second strain sensors 10A, 10B are adjacent to each other in the circumferential direction, and form a V-shaped array in which the angle α between the maximum gain lines K1, K2 is 60-120°. An estimation method includes a strain measuring step of obtaining the outputs of 2n-sets of sensors by simultaneously measuring the tire strain by the strain sensors 10A, 10B of the sensor unit G at the predetermined tire rotational angle position Q, and a computation step of obtaining the estimated values of the longitudinal force Fx, the lateral force Fy and the vertical force Fz based on the outputs of 2n-sets of sensors. PCOPYRIGHT: (C)2010,JPO&INPIT