| 摘要 |
To prevent spurious response due to spurious signals in the electrical system of a vehicle, a group of threshold switches responding to different wheel speed rates of change are provided; in advance of a differentiator, a first low pass filter of a band pass range of about 45 Hz is connected, the output of the differentiator having a second low pass filter of a band pass range of about 18 Hz connected thereto, the threshold switches being connected either to the differentiator directly or behind the second low pass filter. Some of the threshold switches preferably have threshold shift inputs which are energized over time delay circuits to shift the threshold levels, after having responded, to prevent extended bleeding of pressurized brake fluid, for responsiveness to changes in road condition and even response of systems associated with different wheel axles. |
