ESTIMATION DEVICE FOR MAXIMUM COEFFICIENT OF FRICTION OF VEHICLE TRAVELING ROAD SURFACE

摘要

PURPOSE:To pertinently estimate the maximum coefficient of friction of a vehicle traveling road surface without being influenced by the condition of driving the vehicle. CONSTITUTION:The slip rate and coefficient of friction of a wheel WL against a vehicle traveling road surface are respectively detected by a slip rate detection means SR and a coefficient of friction detection means CF. Based on those results of detection, the ratio of the coefficient of friction to the slip rate is calculated by a coefficient of friction/slip rate calculation means MC. The specific characteristics between the coefficient of friction and the slip rate are pre-memorized in a coefficient of friction.slip rate characteristic memory means MS. Comparison is made by a comparison means CP between the calculation results of the coefficient of friction/slip rate calculation means MC and the specific characteristic memorized by the memory means MS and the maximum coefficient of friction is estimated by a maximum coefficient of friction estimation means ME is accordance with the comparison results. The estimated results of the maximum coefficient of friction estimation means ME are corrected and output by a correction means SA in accordance with the vehicle driving condition.