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Working group and guide ASIL metrics in the on-board network

The Cluster Automotive initiates and coordinates working groups with the automotive industry focusing on the automotive wiring system. Here, over the years, an open community of OEMs, assemblers, cable manufacturers, contact manufacturers and equipment manufacturers has emerged, which deals with diverse topics: new materials, automation, high data rates, variant reduction, ASIL in the wiring system (focus: failure rates).

Guideline ASIL metrics in the on-board network
ASIL-Metrik im Bordnetz

It is not only in the course of automated driving that safety objectives of electrical/electronic components and the corresponding design of wiring system architectures must be reconsidered.

What is already common practice for ECUs and active E/E components via ASIL (Automotive Safety Integrity Level) and via an ISO 26262 standard on Functional Safety (FuSi) as part of the development process, has so far hardly been adequately described for a passive system such as the wiring system.

In the context of functional safety of power and data onboard networks, the classification of the onboard network or of onboard network components as passive assembly(s) is missing in the context of ASIL and functional safety (FuSi, ISO 26262).

The ASIL Metrics for the Automotive On-Board Network working group is working on the topic of FIT rates as a focal point.

About 35 companies have been working together in this working group since 2016.

Together with OEMs, pre-competitive wiring system suppliers from the entire value chain are working on a guideline for a methodology to determine parameters that determine the functional reliability of wiring system components.

In addition to considering the overall wiring system, each individual component (connector, cable, fuse, splice, cable lug, screw connection, ...) must also be considered, as well as their possible failure modes, failure rates, failure probabilities and failure causes (Physics of Failure); with the aid of a mathematical model, as well as a comparison with failures observed in the field or in tests, a failure rate (usual unit: FIT - Failure in Time), from which a probability of failure can be calculated for each component.

In order to generate a generally and OEM/supplier-spanning binding document, a guide to the ASIL metric in the vehicle electrical system was created together with the ZVEI, which has been available free of charge since October.

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The aim of the guideline is to take a look at the FIT rate as an aspect of the overall wiring system as well as the individual components, to create a binding metric, and to provide support for quantitative evidence for determining FIT rates if no information is available for a component.

Specified as non-binding recommendations are exemplary methodologies and procedures for calculating the FIT rate, as well as uniform system definitions of wiring system components that deal with, for example, connectors, splice, line, fuse, cable lug, ...

Participating companies in the AK ASIL - FIT rates in the wiring system:

Aptiv Services Deutschland GmbH, AUDI AG, Auto-Kabel Management GmbH, BMW Group, Coficab Deutschland GmbH, Context AG, Dräxlmaier Group, DSG-Canusa GmbH, Fujikura Automotive Europe GmbH, Gebauer & Griller Kabelwerke GmbH, Gustav Klauke GmbH, Intercable GmbH, KBE Elektrotechnik GmbH, KOSTAL Kontakt Systeme GmbH, Kromberg & Schubert GmbH & Co. KG, Kugler Maag Cie, Lear Corporation Engineering GmbH, LEONI Bordnetz-Systeme GmbH, LEONI Kabel GmbH, Littelfuse Europe GmbH, MD Elektronik GmbH, Nexans autoelectric GmbH, Porsche AG, Schulte & Co. GmbH, Prysmian Kabel und Systeme GmbH, Rosenberger Hochfrequenztechnik GmbH & Co. KG, Samoconsult GmbH, Schulte & Co. GmbH, Schunk Sonosystems GmbH, Stanley Engineered Fastening, Strunk Connect - Automated Solutions GmbH & Co. KG, Sumitomo Electric Bordnetze SE, TE Connectivity Germany GmbH, Telsonic AG, TÜV SÜD Autoservice GmbH, University of the Federal Armed Forces, Volkswagen AG, Yazaki Systems Technologies GmbH, ZF Friedrichshafen AG.

Your contact

Dr. Andreas Böhm
Matthias Mederer