Automotive anti-skid control system with control of sampling of input time data of wheel speed sensor signals and method therefor

摘要

An anti-skid control system samples the input timing of the first pulse of a group of a given number of sensor signal pulses, which given number is so adjusted that the difference between the durations of successive pulse groups is great enough to perform the anti-skid control operation based thereupon. The anti-skid control system performs the sampling operation as an interrupt routine intermittently interrupting a main job which derives a control signal for increasing, decreasing or holding the fluid pressure to be applied to the wheel cylinder. A count of the occurrence of interruption is incremented by one whenever an interrupt occurs and is decremented by one upon completion of each cycle of the main job. The sampling routine is performed in response to the first of each group of the given number of sensor signal pulses. If the difference between the durations of successive pulse groups is less than the predetermined value, then, the number of sensor signals to be ignored before sampling the input timing of the first pulse of the next group is increased until the difference becomes greater than the predetermined value.