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A Fault Tolerant Time Interval Process for Functional Safety Development
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 2, 2019 by SAE International in United States
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During development of complex automotive technologies, a significant engineering effort is often dedicated to ensuring the safe performance of these systems. An important aspect to consider when assessing the viability of different safety designs or strategies is the time period from the occurrence of a fault to the violation of a Safety Goal (SG). This time period is commonly referred to as the Fault Tolerant Time Interval (FTTI). In Automotive Safety, ISO 26262  calls for the identification and appropriate partitioning of the FTTI, however very little guidance is provided on how to do this. This paper presents a process, covering the entire safety development lifecycle, for the identification of timing constraints and the development of associated requirements necessary to prevent Safety Goal violations.
CitationDenomme, D., Hooson, S., and Winkelman, J., "A Fault Tolerant Time Interval Process for Functional Safety Development," SAE Technical Paper 2019-01-0110, 2019, https://doi.org/10.4271/2019-01-0110.
- International Organization for Standardization, “Road Vehicles - Functional Safety,” ISO/FDIS Standard No. 26262, Jul. 2018.