To do primary reversion degree of acceleration and deceleration of road surface state decision manner and

摘要

PPROBLEM TO BE SOLVED: To provide a road surface condition determination method capable of accurately determining a split μ road whose surface has different abrasion coefficients on the right and left sides of a vehicle before wheels slip considerably. PSOLUTION: The road surface condition determination method has a process for detecting the rotation information of four tires mounted to the vehicle, a process for calculating acceleration and deceleration of the vehicle, a process of calculating a slip ratio of each two wheels of right and left sides, a process for conducting the moving average operation of the each slip ratio and the acceleration and deceleration of the vehicle at every predetermined time, a process for calculating a regression coefficient and a correlation coefficient of each two wheels of right and left sides by calculating a linear regression about the moving average of each slip ratio and the acceleration and deceleration of the vehicle, and a process for determining the condition of road surface by comparing the regression coefficients, if the correlation coefficients of both the two wheels of right and left sides exceed a predetermined value. PCOPYRIGHT: (C)2003,JPO