As the high frequency component of the above-mentioned vibrating ripple mark is selected from information of the vibrating ripple mark which is detected presumption manner

摘要

PROBLEM TO BE SOLVED: To enhance the running stability of a vehicle by presuming accurately the road surface friction coefficient in precision in a short time without using a method of frequency analysis.;SOLUTION: This method comprises a high frequency component extracting means 13 which extracts the high frequency components from the information of the vibratory waveform sensed by an acceleration sensor 11, a vibratory amplitude sensing means 15 to sense the amplitude of the high frequency component at its time of kicking out, a wheel speed sensing means 12 to sense the wheel speed, a vibratory amplitude correcting means 16 to correct the presumed road surface friction coefficient with the wheel speed, and a road surface friction coefficient presuming means 17 which presumes the size of the road surface friction coefficient by comparing the corrected amplitude with the preset threshold.;COPYRIGHT: (C)2006,JPO&NCIPI