Automatic train-line air brake pressure monitoring system
AssigneeSouthern Railway Company
InventorJames F. Shockley
Life of this patent
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Abstract
In an automatic train-line air brake pressure monitoring system, a peak detector and hold circuit determines the peak voltage of an input signal representing the air pressure in the air brake system. A signal representing the present peak voltage of the input signal from the previously detected peak voltage is subtracted from the presently detected peak voltage to provide a subtraction output signal such that signals representative of the air brake pressure can be generated. The monitoring system may provide emergency air brake condition signals, as well as a number of programmable monitoring signals representative of different pressures within the air brake pressure system.
Claims12
An automatic train-line air brake pressure monitoring system, comprising:
- peak detector and hold circuit means for determining the peak voltage of an input voltage signal representing the air pressure in the air brake system;
- means for subtracting a signal representing the present peak voltage of the input signal from a previously detected peak voltage of the input signal to provide a subtraction output signal;
- output means responsive to said subtraction output signal for generating output signals representative of the air brake pressure;
- and
- means responsive to at least one of said output signals from said output means for resetting said peak detector and hold circuit means.
Dependencies are inferred from the claim text.