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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. (Postprint)
In: IEEE Transactions on Intelligent Vehicles, 7 (2), pp. 251-262. e-ISSN 2379-8904,
DOI: 10.1109/TIV.2021.3129933,
[Article]

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.

Item Type: Article
Erschienen: 2022
Creators: Stolte, Torben ; Ackermann, Stefan Martin ; Graubohm, Robert ; Jatzkowski, Inga ; Klamann, Björn ; Winner, Hermann ; Maurer, Markus
Origin: Secondary publication service
Status: Postprint
Title: Taxonomy to Unify Fault Tolerance Regimes for Automotive Systems: Defining Fail-Operational, Fail-Degraded, and Fail-Safe
Language: English
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.

Journal or Publication Title: IEEE Transactions on Intelligent Vehicles
Volume of the journal: 7
Issue Number: 2
Place of Publication: Darmstadt
Collation: 12 Seiten
Uncontrolled Keywords: Safety, fault tolerance, fault tolerance regime, fail-operational, fail-safe, fail-degraded, safe state
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Automotive Engineering (FZD)
Date Deposited: 09 Sep 2022 13:57
DOI: 10.1109/TIV.2021.3129933
URL / URN: https://tuprints.ulb.tu-darmstadt.de/22082
URN: urn:nbn:de:tuda-tuprints-220820
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