Communications: electrical – Override of traffic control indicator by command transmitter
Patent
1981-07-01
1984-07-31
Groody, James J.
Communications: electrical
Override of traffic control indicator by command transmitter
340931, 340642, 340916, 364436, G08G 107, G08G 1097
Patent
active
044633394
ABSTRACT:
Traffic signals at an intersection are controlled by one or more controllers of the state/interval type, located in the vicinity of the intersection. One or more remote units that are portable or mobile communicate with the controller via a coded signal to command specific light operations, instruct a secondary controller to take-over light control at the intersection from a primary controller, and to reprogram the operation of the controller on a temporary or permanent basis. The remote units generate a code that must be received accurately by the controller before commands are followed. In order to economically provide such a code, the code generator employs a diode matrix that orders data words and address words and is easily reprogrammed. The traffic signal indicator operation is monitored by the controller both to detect controller error, as by a voltage error resulting from an incorrect controller action, and to detect a non-controller error, as by a current error resulting from a burned out indicator. The controller may take different corrective action depending upon the nature of the error, including switching to another controller. An anti-coincidence logic circuit is connected between a state/interval controller and the light driver and disconnect.
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patent: 3818429 (1974-06-01), Meyer et al.
patent: 3828307 (1974-08-01), Hungerford
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patent: 4135145 (1979-01-01), Eberle
Frick Ralph E.
McNulty Nelson E.
Frick Ralph E.
Groody James J.
Rost Kyle W.
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