HYDRAULIC CIRCUIT CONTROL SYSTEM OF BRAKE SYSTEM, BRAKE SYSTEM OF VEHICLE, VEHICLE, ROAD FRICTIONAL COEFFICIENT ESTIMATING METHOD OF ABS, AND WHEEL CYLINDER PRESSURE CONTROL METHOD OF ABS

摘要

PURPOSE: A hydraulic circuit control system of a brake system, the brake system of a vehicle, the vehicle, a road frictional coefficient estimating method of an ABS(Anti-Lock Brake System), and a wheel cylinder pressure control method of the ABS are provided to estimate an effective road frictional coefficient close to the actual condition on the road with noise at an initial operation stage of the ABS and to improve driving stability by braking the vehicle to the estimated road frictional coefficient. CONSTITUTION: A hydraulic circuit control system of a brake system for a vehicle is composed of a pressure sensor(104) for detecting pressure of a master cylinder(103); a wheel sensor for detecting the rotational speed of vehicle wheels; and a control unit having a frictional coefficient output unit for computing a road frictional coefficient by values input from the pressure sensor and the wheel sensor and a constant and a low pass filter for removing noise from the computed road frictional coefficient. The control unit regulates the pressure of the wheel cylinder by electronically controlling the hydraulic circuit(106) of the brake system.