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Design and Assessment of a Watch Dog Timer for Safety Improvement of an Embedded Railway Signal Controller  

Shin, Duc-Ko (한국철도기술연구원, 전기신호연구본부)
Lee, Kang-Mi (한국철도기술연구원, 전기신호연구본부)
Lee, Jae-Ho (한국철도기술연구원, 전기신호연구본부)
Kim, Yong-Kyu (한국철도기술연구원, 전기신호연구본부)
Publication Information
Journal of the Korean Society for Railway / v.10, no.6, 2007 , pp. 730-734 More about this Journal
Abstract
In this paper, we suggest the criticality of Hidden Failure with regard to the design of watch dog timer, used to detect HALT on railway signaling embedded controller, via FMEA and FTA. Hidden Failure means reliability and safety degradation of the system due to any failure occurred on elements added for fault tolerance. In this paper, therefore, we design vital watch dog timer to prevent the system from operating in low SIL conditions and assess the safety of circuit on failure occurrence to demonstrate that safety degradation problems owing to existing design are supplemented.
Keywords
Embedded Controller; Watch-Dog Timer; Vital; Safety; SIL (Safety Integrity Level);
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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