초록 ▼

A method of preventing wheels of a vehicle from skidding, including the steps of detecting the peripheral speed of a wheel and picking it up as a wheel-speed signal, detecting the vehicle speed and setting a reference wheel-speed signal based on the detected vehicle speed, deriving a wheel-accelerat

A method of preventing wheels of a vehicle from skidding, including the steps of detecting the peripheral speed of a wheel and picking it up as a wheel-speed signal, detecting the vehicle speed and setting a reference wheel-speed signal based on the detected vehicle speed, deriving a wheel-acceleration signal from said wheel-speed signal, and setting a reference wheel-deceleration signal for comparison with said wheel-acceleration signal. During braking operation, the brake torque applied to the wheel is controlled such that it is maintained constant to prevent the further increase thereof when the level of the wheel-accleration signal decreases below the level of said wheel-deceleration signal under the condition that the level of said wheel-speed signal is higher than that of said reference wheel-speed signal. On the other hand, if the level of said wheel-speed signal is lower than that of said reference wheel-speed signal, the brake torque is reduced when the level of said wheel-acceleration signal decreases below the level of said reference wheel-deceleration signal. Preferably, in order to make much finer and more accurate control over the brake torque, various reference signals are set for comparison with said vehicle-speed signal, said wheel speed signal and said wheel-acceleration signal, and logical judgements are made on the respective signals. In addition, peripheral speeds of a plurality of wheels are preferably detected and the greatest peripheral speed thereof is used for estimation of said vehicle speed.

대표청구항 ▼

An anti-skid method of preventing skid of wheels of a vehicle comprising: detecting the peripheral speed of a wheel of a vehicle and picking it up as a wheel-speed signal (Uwi), detecting the speed of the vehicle, setting from the detected vehicle speed a first reference wheel-speed signal (UR) and

An anti-skid method of preventing skid of wheels of a vehicle comprising: detecting the peripheral speed of a wheel of a vehicle and picking it up as a wheel-speed signal (Uwi), detecting the speed of the vehicle, setting from the detected vehicle speed a first reference wheel-speed signal (UR) and a second reference wheel-speed signal (Vwo) of a level lower than that of said first reference wheel-speed (UR) for comparison with said wheel-speed signal (Uwi), deriving a wheel-acceleration signal (Uwi) from said wheel-speed signal (Uwi), setting a reference wheel-deceleration signal (-Vwo) representative of a negative wheel acceleration for comparison with said wheel-acceleration signal(Uwi), comparing, during braking, said wheel-speed signal (Uwi) with said first and second reference wheel-speed signals (UR, Vwo) and also said wheel-acceleration signal (Uwi) with said reference wheel-deceleration signal (-Vwo), and controlling a braking torque (TB) applied to said wheel such that said brake torque (TB) is maintained constant from the time when the level of said wheel-acceleration signal (Uwi) falls below the level of said reference wheel-deceleration signal (-Vwo) if the level of said wheel-speed signal (Uwi) is higher than that of said first reference wheel-speed signal (UR), and thereafter, said brake torque (TB) is reduced from the first instant when the level of said wheel-speed signal (Uwi) falls below the level of said first reference wheel-speed signal (UR) if the level of said wheel-acceleration signal (Uwi) remains below the level of said reference wheel-deceleration signal (-Vwo), or at the second instant when the level of said wheel-speed signal (Uwi) falls below the level of said second reference wheel-speed signal (Vwo), the reduction of said brake torque (TB) taking place at an earlier one of said first and second instants.