Circuit arrangement for automatic monitoring of protection time

Details Circuit arrangement for automatic monitoring of protection time Circuit arrangement for automatic monitoring of protection time

1975-03-06

1976-11-16

Miller, Jr., Stanley D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

328 42, 328 72, 340 40, H04B 100, G08G 100

Patent

active

039926710

ABSTRACT:
A circuit arrangement for the automatic monitoring of protection time periods in street traffic signal systems, wherein, on the commencement of the "stop" signal for a group of signals a switching device, determining the protection periods for one or more incompatible signal groups, is initiated, employing a pulse train counter for each group of signals, which may be in the form of a binary counter with a plurality of flip-flops, at the outputs of which counter arbitrary time signals may be obtained representing specific protection time periods which are conducted to respective individual trigger elements operatively connected to the pertinent incompatible signal groups, with such trigger elements being set when the corresponding counter step is reached for the desired protective period, and which, for the remainder of the existing stop signal, emit a "free" signal to the pertinent incompatible signal group, the "go" signal for a signal group which is to be released being linked by an AND gate with all "free" signals of incompatible signal groups. The "go" signal of a signal group also may be linked by an AND gate with the inverted "free" signals, of all the incompatible signal groups, to form a fault signal.

REFERENCES:
patent: 3072883 (1963-01-01), Hendricks et al.
patent: 3641486 (1972-02-01), Brocket et al.
patent: 3816796 (1974-06-01), Molby et al.

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