Anti skid fault detection circuit

Details Anti skid fault detection circuit Anti skid fault detection circuit

1976-02-27

1978-08-22

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

303 92, 340661, B60T 800

Patent

active

041092341

ABSTRACT:
Fault detection circuit which is intended to be included in an anti-skid control system for a braking system of a motor vehicle. The fault detection circuit is coupled between the sensor coil and tachometer portion of the anti-skid control system and detects if the sensor coil becomes: open circuited, shorted to ground, or shorted to a power supply. If any of the aforementioned conditions arise, the fault detection circuit provides an output signal for indicating such a condition to warn the driver of the vehicle that the anti-skid control system is non operative. A low pass RC filter is utilized to limit the input signal amplitude developed across the sensor coil to a constant value which is determined by the time constant of the low pass filter. Upper and lower references voltages can be established and compared to the filter input signal to indicate failure if this voltage developed across the sensor coil approaches either the upper or lower reference voltage.

REFERENCES:
patent: 3641546 (1972-02-01), Blackburn
patent: 3825307 (1974-07-01), Carr et al.
patent: 3917359 (1975-11-01), Sapir
patent: 3930687 (1976-01-01), Amano

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