Patent ID: 7707876
Filing Date: 2010-05-04
Classification: B60C,G01L,Y10T

Abstract:
1. A method for estimating the magnitude of a tire force acting on a rolling tire comprising: using seven sensors mounted on the tire at circumferentially different mounting positions; measuring a strain at seven different measuring positions (i) at a certain point of time during tire rolling by the use of said seven sensors, wherein each of the measuring positions (i) is such a position that the magnitude t(i) of the strain to be measured has a substantially linear correlation with each of seven force components which are a longitudinal force Fx, a side force Fy, a vertical load Fz, an overturning moment Mx, a rolling resistance moment My, a self-aligning torque Mz and an air pressure P acting on the tire, whereby the following conditional equation is satisfied: wherein a(i), b(i), c(i), d(i), e(i), g(i) and h(i) are coefficients specific to the measuring position (i); obtaining the magnitude t(i) of the measured strain with respect to each of the seven different measuring positions (i), wherein (i) is from 1 to 7, whereby forming the following 7×7 matrix of said coefficients about a combination of said seven different measuring positions (i); and computing the following equation including said matrix to find at least one of the seven force components.