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Taxonomy to Unify Fault Tolerance Regimes for Automotive Systems: Defining Fail-Operational, Fail-Degraded, and Fail-Safe

Stolte, Torben ; Ackermann, Stefan Martin ; Graubohm, Robert ; Jatzkowski, Inga ; Klamann, Björn ; Winner, Hermann ; Maurer, Markus (2022)
Taxonomy to Unify Fault Tolerance Regimes for Automotive Systems: Defining Fail-Operational, Fail-Degraded, and Fail-Safe.
In: IEEE Transactions on Intelligent Vehicles, 2021, 7 (2)
doi: 10.26083/tuprints-00022082
Article, Secondary publication, Postprint

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Item Type: Article
Type of entry: Secondary publication
Title: Taxonomy to Unify Fault Tolerance Regimes for Automotive Systems: Defining Fail-Operational, Fail-Degraded, and Fail-Safe
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2021
Journal or Publication Title: IEEE Transactions on Intelligent Vehicles
Volume of the journal: 7
Issue Number: 2
Collation: 12 Seiten
DOI: 10.26083/tuprints-00022082
Corresponding Links:
Origin: Secondary publication service
Abstract:

This paper presents a taxonomy that allows defining the fault tolerance regimes fail-operational, fail-degraded, and fail-safe in the context of automotive systems. Fault tolerance regimes such as these are widely used in recent publications related to automated driving, yet without definitions. This largely holds true for automotive safety standards, too. We show that fault tolerance regimes defined in scientific publications related to the automotive domain are partially ambiguous as well as taxonomically unrelated. The presented taxonomy is based on terminology stemming from ISO 26262 as well as from systems engineering. It uses four criteria to distinguish fault tolerance regimes. In addition to fail-operational, fail-degraded, and fail-safe, the core terminology consists of operational and fail-unsafe. These terms are supported by definitions of available performance, nominal performance, functionality, and a concise definition of the safe state. For verification, we show by means of two examples from the automotive domain that the taxonomy can be applied to hierarchical systems of different complexity.

Uncontrolled Keywords: Safety, fault tolerance, fault tolerance regime, fail-operational, fail-safe, fail-degraded, safe state
Status: Postprint
URN: urn:nbn:de:tuda-tuprints-220820
Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering > Institute of Automotive Engineering (FZD)
Date Deposited: 09 Sep 2022 13:57
Last Modified: 14 Apr 2023 08:29
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22082
PPN: 503307122
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