Anti-skid brake control system for automotive vehicle

摘要

An anti-skid brake control system performs arithmetic operations for deriving wheel speed on the basis of wheel sensor signal pulses at a first given timing. The first given timing is determined in view of response characteristics of an electromagnetic actuator of a pressure control valve in a hydraulic brake system. The anti-skid control system also performs arithmetic operations for deriving wheel acceleration on the basis of wheel speed sensor signal pulses at a second timing. The second timing is adjusted according to the sensor signal pulse frequency so that the difference between successive pulse intervals or the difference between the durations of successive sensor signal pulse groups exceeds a given value which is the threshold for performing wheel acceleration calculation to obtain a result useful in anti-skid control operation. Perferably, the anti-skid brake control system is provided with a plurality of digital processors, each of which is adapted to perform anti-skid brake control operations for a corresponding vehicle wheel or wheel set. Each of the digital processors can operate independently of the others and independently produces control signals for optimizing the braking characteristics of the corresponding wheel.