Optimal Maintenance Policy for Dangerous Undetected Fault of E/E/PE Safety-Related Systems  
Author Shinji Inoue


Co-Author(s) Kousuke Maki; Takaji Fujiwara; Shigeru Yamada


Abstract E/E/PE safety-related systems are widely implemented in several types of systems, such as automotive and chemical plant control systems, for the safe operation of them. In the operation of the systems, proof-testing, which is known as a scheduled inspection or maintenance activities, plays an important role for maintaining certain level of safety integrity required in the operation. However, the proof-testing needs a lot of time and cost for checking and proofing whether the safety-related system satisfies the safety requirement. We discuss economic strategies for supporting design of proof-testing interval by focusing on the trade-off relationship between the maintenance cost and the risk at harmful event occurrence.


Keywords Functional safety, E/E/PE safety-related systems, Proof testing, DU fault, Optimal proof-testing intervals.
    Article #:  RQD27-31

Proceedings of 27th ISSAT International Conference on Reliability & Quality in Design
Virtual Event

August 4-6, 2022