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Design of a small‐size interlocking system with high availability
Author(s) -
Kawabata Atsushi,
Anzai Nobuo,
Kikuchi Tsunenobu,
Fukui Satoshi,
Toyoda Hiroyuki,
Fujiwara Michio,
Yanagi Hitoshi
Publication year - 1999
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(19990730)128:2<63::aid-eej8>3.0.co;2-5
Subject(s) - interlocking , fault (geology) , power (physics) , signal (programming language) , unit (ring theory) , computer science , position (finance) , engineering , electrical engineering , control theory (sociology) , reliability engineering , control (management) , mathematics , physics , geology , artificial intelligence , mathematics education , finance , quantum mechanics , seismology , economics , programming language
An interlocking system consists of an interlocking logical unit and a power controlling unit. After this logical unit calculates the relationship among the train position, the rail shifting position, and the signal, it decides the aspect of the signal. The power controlling unit supplies electrical power to the switch motor and the signal light according to the decision of the logical unit. This paper proposes a small‐sized interlocking system which uses a triplex redundant off‐the‐shelf controller with fail‐safe checker as an interlocking logical unit. A majority voting circuit ensures the safety of parallel output from the interlocking logical unit. This circuit satisfies the condition of total self‐checking (of D.A. Anderson) and also the condition of high availability. In other words, no single fault ever leads to a hazardous state and this circuit ensures safety after single fault occurrence. © 1999 Scripta Technica, Electr Eng Jpn, 128(2): 63–73, 1999