Communications: electrical – Traffic control indicator – Traffic control or local controller failure indicator
Patent
1993-03-25
1995-02-07
Swarthout, Brent
Communications: electrical
Traffic control indicator
Traffic control or local controller failure indicator
315130, 340642, 340953, G08G 1097
Patent
active
053879090
ABSTRACT:
A method and apparatus for determining the presence of a burned out lamp of a traffic signal is disclosed. The current applied to one or more banks of traffic signals and the voltage applied across such traffic signal banks are measured simultaneously. An electrical characteristic, such as impedance, of such traffic signal banks, is measured for each pattern of switch settings which control lamp illumination for signalling as they occur. Such characteristic is stored for each of the unique patterns which are repeated over and over again to control traffic. Such previously stored characteristic provides a baseline characteristic for each successive pattern of illumination of the lamps. With each pattern change, such characteristic is measured and compared with the previous baseline characteristic for the pattern to determine if a lamp has burned out.
REFERENCES:
patent: 2166721 (1939-07-01), Jeffers
patent: 3715741 (1973-02-01), McWade et al.
patent: 4295079 (1981-10-01), Otsuka et al.
patent: 4396868 (1983-08-01), Watanabe et al.
patent: 4811010 (1989-03-01), Lucas
patent: 5034659 (1991-07-01), Taniguchi
patent: 5235317 (1993-08-01), Sutterlin et al.
patent: 5248967 (1993-09-01), Daneshfar
Published announcement of Traffic Sensor Corporation (at least as late as 1991).
Publication of the Sep./Oct., 1992 IMSA Journal, by Eric A. Metz, titled "Automatic Detection of Traffic Signal Lamp Outages".
Sales brochure of IMON Electronics, Inc. of Portland, Oreg., Dec. 1989.
Letter and brochure dated Apr., 1992 of Industrial Processor Controls Corp.
Beyer Henry T.
Neel Clyde J.
Naztec, Inc.
Swarthout Brent
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