This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Diagnostic Coverage Evaluation Method for Analog Circuits to Comply with Functional Safety Standards
Technical Paper
2015-01-0267
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The ISO 26262 is a functional safety standard for road vehicles. The standard requires manufacturers to conduct quantitative assessment of the diagnostic coverage (DC) of products. The DC is defined as the percentage of failure probability covered by safety mechanisms. However, DC evaluation methods for drift faults, in which the change in element values is not constant, have not been discussed. In this paper, we propose a DC evaluation method for analog circuits with drift faults. With this method, we first parameterize the effect of drift faults onto a bounded region then split the region into safe fault, hazardous detectable fault, and hazardous undetectable fault regions. We evaluate the classification rate distribution by the area ratios of these regions. Afterward, we evaluate the hazardous failure probability by multiplication of the failure probability of a hardware element, the fault rate distribution of fault models, and classification rate distribution of the hazardous undetectable fault. The DC of a functional block is given as the sum of the failure probabilities of hardware elements and that of the hazardous failure probabilities.
We developed a DC evaluation toolkit to reduce the workload of DC evaluation. This toolkit takes into account a circuit design and fault models for each hardware element and automatically determines the DC under specified operating conditions. The overall productivity gain from using this toolkit is more than 10 times that of manual evaluation, based on a comparison of the evaluation time. This toolkit removes overhead workload and aids in quantitative DC evaluation.
Recommended Content
Authors
Citation
Inada, R., Hirotsu, T., Morita, Y., and Hata, T., "Diagnostic Coverage Evaluation Method for Analog Circuits to Comply with Functional Safety Standards," SAE Technical Paper 2015-01-0267, 2015, https://doi.org/10.4271/2015-01-0267.Also In
References
- International Electrotechnical Commission IEC 61508 Edition 2.0: Functional safety of electrical/electronic/programmable electronic safety-related systems - 2010
- International Organization for Standardization ISO 26262: Road vehicles - Functional safety - 2011
- Seo-Hyun , J. , Jin-Hee C. , Yangjae J. , Sachoun P. et al. Automotive Hardware Development According to ISO 26262 The 13 th International Conference on Advanced Communication Technology 588 592 2011
- Japan Automotive Software Platform and Architecture Handbook for Functional Safety [ASIC Edition] ver. 1.0.0 2013
- Dutt , S. , Verma , V. , and Suthar , V. Built-in-Self-Test of FPGAs With Provable Diagnosabilities and High Diagnostic Coverage With Application to On-Line Testing IEEE Transactions on Computer-Aided Design of Integrated Circuit and Systems 27 2 309 326 2008
- Adler , N. , Otten , S. , Cuenot , P. , and Müller-Glaser , K. Performing Safety Evaluation on Detailed Hardware Level according to ISO 26262 SAE Int. J. Passeng. Cars - Electron. Electr. Syst 6 1 102 113 2013 10.4271/2013-01-0182
- International Electrotechnical Commission IEC TR 62380 Edition 1.0: Reliability data handbook - Universal model for reliability prediction of electronics components, PCBs and equipment 2004
- International Electrotechnical Commission IEC 61709 Edition 2.0: Electric components - Reliability - Reference conditions for failure rates and stress models for conversion 2011