Railways – Track clearers
Patent
1980-05-13
1982-04-13
Bertsch, Richard A.
Railways
Track clearers
174211, 219213, 237 1R, 246428, 340584, G08B 2100
Patent
active
043241840
ABSTRACT:
A temperature control system and method for controlling the bus bar temperature of an automated guideway transit system in relation to the ambient dew point temperature. A resistance temperature device detects the temperature of the bus bars, and a dew point cell detects the dew point temperature of the ambient atmosphere. A first transmitter converts the detected bus bar temperature to a first electrical signal, and then amplifies and transmits the first electrical signal. A second transmitter converts the detected dew point temperature to a second electrical signal, and then amplifies and transmits the second electrical signal. A first electronic comparator receives the transmitted signals and detects the magnitude of the difference between the two signals. When the magnitude of the difference between the two signals reaches a set level, an output signal is triggered. A second electronic comparator generates an output signal whenever the detected bus bar temperature is less than or equal to a preset value (approximately 32.degree. F. (0.degree. C.)). The outputs from the two comparators are used to trigger an AND gate, which in turn energizes a relay used to turn on a heating element, thus keeping the bus bar temperature within a set range of the ambient dew point temperature.
REFERENCES:
patent: 3585355 (1971-06-01), Nasser
patent: 3806702 (1974-04-01), Spencer
patent: 4051466 (1977-09-01), Protze
Bertsch Richard A.
Nydegger Rick D.
Universal Mobility, Inc.
Workman H. Ross
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