Vehicle wheel anti-skid or anti brake-lock system

Details Vehicle wheel anti-skid or anti brake-lock system Vehicle wheel anti-skid or anti brake-lock system

1982-09-27

1984-08-28

Truhe, J. V.

Boots, shoes, and leggings

303 92, 303 93, 303 95, B60T 808

Patent

active

044687400

ABSTRACT:
To reduce disturbance and interference signals, and particularly recurring disturbance signals due to vibration or out-of-round conditions of rotating elements coupled to a speed transducer, a low-pass filter (11) is connected to the speed transducer and, in addition, a high-pass filter (12) which, however, is disconnected upon sensing that the speed of the wheel or of the vehicle is below a predetermined limit, or that the anti brake-lock system unit (13) has responded. Thus, disturbance signals, and particularly periodic disturbance signal which might cause oscillatory conditions to arise in the filter and transducer circuitry, are effectively suppressed. To further increase the reliability of response, the output from the filter circuits is connected to threshold circuits with a variable threshold level in which comparators compare a peak signal with a weighted, then existing signal, so that the comparison level threshold is continuously shifted based on previously occurring peaks, so that disturbance signals are reliably excluded from affecting signal processing within the anti brake-lock system unit (13).

REFERENCES:
patent: 3820857 (1974-06-01), Schnaibel et al.

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