ROAD SURFACE STATE DETERMINATION METHOD OF ANTI-LOCK BRAKE SYSTEM, FOR PREVENTING LOWERING OF BRAKE PERFORMANCE CAUSED BY WRONG DETERMINATION OF ROAD SURFACE STATE

摘要

PURPOSE: A road surface state determination method of an anti-lock brake system is provided to improve the performance of a brake of a vehicle by exactly determining the state of the surface of a travel road. CONSTITUTION: A road surface state determination method of an anti-lock brake system comprises steps of detecting the speed of wheels every detection period(100); calculating a speed difference of wheels in the former period and the current period(101¯103); counting the changed frequency of signs of the speed difference(104¯106); determining the road surface state of wheels according to the counted frequency(107¯109); and controlling braking force of the corresponding wheel according to the determined road surface state and the wheel speed.