Patent ID: 6260935
Filing Date: 2001-07-17
Classification: B60T

Abstract:
A system for detecting an unpaved road comprising:wheel speed sensors for detecting wheel speeds of wheels of a vehicle;vehicle speed detection means for detecting a vehicle speed of said vehicle;slip calculation means for calculating slip on the basis of the wheel speeds detected by said wheel speed sensors and the vehicle speed of said vehicle detected by said vehicle speed detection means;a linear acceleration sensor for detecting an acceleration of said vehicle in a longitudinal direction thereof and producing a signal linearly proportional to the detected acceleration;variation calculation means for calculating a variation of the signal produced by said linear acceleration sensor corresponding to a variation of the slip calculated by said slip calculation means; anddetermination means for comparing the variation of the signal calculated by said variation calculation means with a reference value, and determining that said vehicle is traveling on an unpaved road, if the variation exceeds the reference value.