Portable conflict monitor testing apparatus
First Claim
1. Apparatus for simulating a malfunctioning traffic signal control for testing response times and operability of a conflict monitor of the type adapted to receive traffic controller signals from a traffic signal controller and to provide an indication of traffic signal controller and upon detection of such malfunction, the apparatus comprising:
- circuit means for producing an enable signal;
switch means coupled to the circuit means for receiving the enable signal for initiating a test signal in response to the enable signal;
selection means adapted to be coupled to the conflict monitor for receiving the test signal to develop therefrom simulated traffic controller signals representative of a malfunctioning traffic controller for communication to the conflict monitor;
generating means coupled to the switch means and responsive to initiation of the test signal for generating a timing signal, the generating means including means adapted to receive said indication of traffic signal controller malfunction to terminate the timing signal upon receipt thereof; and
counter means coupled to the generating means to receive the timing signal and to produce therefrom indicia of a response time of the conflict monitor.
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Abstract
Portable apparatus for checking, in place, a conflict monitor which includes a test signal generator that produces a test signal that is applied to a programmable switch array to develop AC voltages, simulating a malfunctioning traffic signal controller. The apparatus includes timing circuitry that is operable in response to the test signal to determine the time taken by the conflict monitor under check to respond to application of a simulated traffic signal controller malfunction.
21 Citations
20 Claims
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1. Apparatus for simulating a malfunctioning traffic signal control for testing response times and operability of a conflict monitor of the type adapted to receive traffic controller signals from a traffic signal controller and to provide an indication of traffic signal controller and upon detection of such malfunction, the apparatus comprising:
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circuit means for producing an enable signal; switch means coupled to the circuit means for receiving the enable signal for initiating a test signal in response to the enable signal; selection means adapted to be coupled to the conflict monitor for receiving the test signal to develop therefrom simulated traffic controller signals representative of a malfunctioning traffic controller for communication to the conflict monitor; generating means coupled to the switch means and responsive to initiation of the test signal for generating a timing signal, the generating means including means adapted to receive said indication of traffic signal controller malfunction to terminate the timing signal upon receipt thereof; and counter means coupled to the generating means to receive the timing signal and to produce therefrom indicia of a response time of the conflict monitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Apparatus for testing the response time and operability of a conflict monitor, the conflict monitor being of the type for monitoring a traffic signal controller and adapted to provide a fault indication upon occurrence of traffic signal controller malfunction, the apparatus comprising:
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means for initiating a first test signal at a selectable point in time; means for receiving and selectively communicating the test signal to the conflict monitor as a plurality of simulated traffic signal controller malfunctions; means adapted to detect the indication of fault provided by the controller and to produce therefrom indicia representing a response time of the conflict monitor detection of traffic signal controller malfunction.
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15. Apparatus for providing test signals that simulate operation of a traffic signal controller for testing a conflict monitor response, the conflict monitor being of the type operable to produce a fault signal in response to detection of indications of traffic control signal conflicts, the apparatus comprising:
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first circuit means for providing a plurality of simulations of said indications of traffic signal controller conflicts; second circuit means adapted to receive the fault signal from the conflict monitor; and third circuit means coupled to the first and second circuit means and responsive to the simulations and the fault signal to produce therefrom an indication of response time operability of the conflict monitor; and coupling means adapted to interconnect the apparatus and the conflict monitor to one another for communicating the simulations and the fault signal therebetween. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification