Air brake manifold all level reset

Details Air brake manifold all level reset Air brake manifold all level reset

1987-05-27

1988-07-05

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340 52C, 73121, 307118, 188151A, 303 20, 303 86, B60Q 100

Patent

active

047558032

ABSTRACT:
An improved automatic train-line air brake pressure monitoring system includes circuits that emulate an automatic brake valve and cause an automatic brake manifold release whenever a four psi increase in pressure is sensed. The system includes a pressure sensor amplifier (10) which provides a signal proportional to the sensed pressure in a brake pipe. This signal is tracked by a peak hold circuit (12) that stores the peak value of the signal. The output of the sensor amplifier is subtracted from the output of the peak hold circuit in a subtractor (14) to provide a difference signal. The difference signal is tracked by a reduction hold circuit (22) which stores the minimum value of the difference output from the subtractor. An increase in measured pressure from the stored minimum value is compared in a comparator (24) with a reference value representing the four psi level, and when the increased pressure exceeds the reference value, a system reset is generated.

REFERENCES:
patent: 3748656 (1973-07-01), Gray et al.
patent: 4361825 (1982-11-01), Shockley
patent: 4696446 (1987-07-01), Mochizuki et al.

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