| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device and method for estimating a road surface μ before the occurrence of slip. <P>SOLUTION: The device for estimating a tread friction state of a vehicle detects a resultant force composed of a braking force and a lateral force of a wheel, and a slippage of the wheel (steps S21 and S22); and calculates a road surface friction factor of a current road surface based on a distance obtained by projecting, in a three-dimensional space having the braking force, lateral force and slippage of the wheel as coordinate axes, the magnitude of a current tire force to a line extending from an origin where the braking force, lateral force and slippage are zero to the detected current slippage in the direction of the detected current tire force (steps S23 and S24). <P>COPYRIGHT: (C)2010,JPO&INPIT |
