| 摘要 |
The pressure of the brake-actuating fluid in an antilocking brake control system is varied by pulsing the control valve or valves for durations which are varied to be greater or lesser than the period of that limiting frequency above which the brake system can not respond. In the former case, a rapid increase in fluid pressure or a rapid decrease in fluid pressure occurs, whereas in the latter case, a less rapid average or net increase or decrease in fluid pressure to which the brake system responds occurs. These conditions are controlled in dependence on the rotational behavior of the vehicles wheel or wheels and more especially in dependence on predetermined changes in angular velocity of the wheel. Moreover, either variation in pulse duration at fixed frequency or variation in frequency at fixed pulse duration may be effected during high-frequency pulsing so as further to alter the net increase or decrease in fluid pressure. This further alteration is effected as a function of time from the beginning of the high-frequency pulsing.
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