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Reliable control system design for contribution to international safety standard, IEC 61508

可靠的控制系统设计有助于国际安全标准 IEC 61508

基本信息

批准号：
14550440
负责人：
SUYAMA Koichi
金额：
$ 2.11万
依托单位：
Tokyo University of Marine Science and Technology (Tokyo University of Mercantile Marine)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Over the past decade the social environment surrounding system safety has changed rapidly. One of the epochs was that TC65 WG9\10 in IEC, International Electrotechnical Commission, established an international standard, IEC 61508. It is applied to almost all electrical/electronic/programmable electronic safety-related systems irrespective of their applications. It has been already quoted into several national standards or guidelines of UK, USA and Japan, including those for process, aerospace and railway transportation sectors. Many studies have simultaneously and independently been made on control system design under possible device failures, reliable control theory, such as integrity, reliable H-infinity control and passive redundancy. The importance of safety function realized in a control system has been growing for the last several years. One of the reasons is that ISO/IEC Guide 51 adopted newly risk for environment and risk for properties as its scope. It is widely known that there are many cases where safety measures outside a control system are not enough to reduce the risk for environment/properties.Hence reliable control theory has been brought to attention by its contribution to system design according to IEC 61508, which can achieve safety function in a control system.This research presents a safety integrity analysis framework for a controller designed especially by reliable control according to the international safety standard, IEC 61508. The presented framework clarifies a concrete contribution of reliable control to required risk reduction and an established meaning of reliable control in system safety design according to IEC 61508. Hence almost all reliable control can be included to the international standard system. The meaning is important beyond measure.

在过去的十年里，围绕系统安全的社会环境发生了迅速变化。其中一个重要的里程碑是国际电工委员会（IEC）的TC 65 WG9\10制定了国际标准IEC 61508。它适用于几乎所有电气/电子/可编程电子安全相关系统，无论其应用如何。它已被英国、美国、日本等国的多项国家标准或指南引用，包括工艺、航空航天和铁路运输等行业的标准或指南。在设备可能失效情况下的控制系统设计、可靠控制理论（如完整性、可靠H ∞控制、无源冗余等）等方面，人们同时又各自独立地进行了研究。在控制系统中实现安全功能的重要性在过去几年中一直在增长。原因之一是ISO/IEC指南51采用了新的环境风险和财产风险作为其范围。众所周知，在许多情况下，控制系统外部的安全措施不足以降低环境/性能的风险。因此，可靠控制理论因其对IEC 61508系统设计的贡献而受到关注。针对控制系统的安全完整性问题，提出了一种基于可靠控制的控制器安全完整性分析框架符合国际安全标准IEC 61508。所提出的框架阐明了可靠控制所需的风险降低的具体贡献，并根据IEC 61508系统安全设计的可靠控制的既定意义。因此，几乎所有可靠的控制都可以纳入国际标准体系。其意义是不可估量的。