철도제어시스템을 위한 높은 신뢰성을 갖는 제어시스템 구조 연구

Abstract

In the railway, signaling systems are located in the wayside and on-board as the very vital control system ensuring the safety operation of the train. Since a trivial failure of this signaling system can cause a fatal railway accident, the securement of high safety and availability of the signaling system is becoming a very important issue. In order to secure the high safety and availability of vital signaling system, efforts need to be made in many aspects of the hardware architecture, software and system lifecycle. Among of these, this paper focuses on the hardware architecture of railway signaling system. Currently, there are several hardware architectures applied to railway signaling systems, including the single, duplicated, and triple redundancy architectures. Single and duplicated redundancy architectures can cause fatal accidents because the whole system is affected when accident occur. For this reason, triple redundancy architecture has been the more popular for vital signaling systems. But this architecture has problems regarding its installation in the railway vehicle, as it occupies a large space and is intrinsically heavy in weight. We propose a noble fault-tolerant architecture for the vital railway signaling system that is triple redundancy-based, a cost-effective architecture that satisfies the installation conditions of space and weight.