JPS6463455A - Artificial car velocity generating device for anti-skid control device - Google Patents

Abstract

PURPOSE:To prevent an artificial car velocity from being remarkably higher than the actual car velocity by changing a reference wheel speed to a wheel speed value at the time of starting a skid cycle immediately before on detecting that the lock time of a wheel is suddenly decreased more than the previous lock time. CONSTITUTION:An anti-skid control device is adapted to decide a reference gradient from a wheel speed at the time of starting a skid cycle when a wheel has a tendency to lock and a reference wheel speed before that at a deciding portion 100, take a wheel speed value on the line as an artificial car velocity at an arithmetic portion 200, reduce the brake fluid pressure of a wheel having a slip relation thereto and reintensify the pressure when it returns. In this arrangement, on judging a sudden decrease such that the lock time of a wheel is shorter than the previous lock time by a designated value in every skid cycle by judging means 99, the reference wheel speed is changed to a car velocity value at the time of starting a skid cycle immediately before by changing means 50. Thus, even in case of moving from a road with a low coefficient (mu) of surface friction to a high (mu) road, the car velocity prevented from being remarkably higher than the actual car velocity to accomplish accurate anti-skid control.