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Peer-reviewedCC BY-NCReliability: Theory & Applications

The dimension of the PMHF functional safety metric of ISO 26262 standard

  • Dmitriy Shevchenko1
  • Victor Netes2
  • Alexander Starovoitov3
  1. 1Unitsky String Technologies Inc.
  2. 2Moscow Technical University of Communication and Informatics
  3. 3Non
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Abstract

The ISO 26262 functional safety metric PMHF, which characterizes the probabilistic properties of random hardware failures, is discussed. The PMHF metric is used to determine the automotive safety integrity level (ASIL). The disadvantages of determining this metric and the inaccuracy associated with the specified dimension [1/hour] are shown. According to the authors of the article, the PMHF metric (the average operational lifetime probability of a dangerous hardware failure per hour) is dimensionless. Reasonable arguments are given that the dimension of the PMHF metric cannot differ from the dimension of the averaged probabilities.

The paper indicates the possible reason for the inaccuracy, and shows the correct way to calculate PMHF, which involves using not the operational lifetime (with a dimension of [hour]), but a dimensionless number of 1-hour time intervals within the device’s operational lifetime.

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Cite

BibTeXRIS
BibTeX
@article{shevchenko2026dimension,
  title = {{The dimension of the PMHF functional safety metric of ISO 26262 standard}},
  author = {Dmitriy Shevchenko and Victor Netes and Alexander Starovoitov},
  journal = {Reliability: Theory \& Applications},
  year = {2026},
  month = jun,
  doi = {10.66721/s1pfd068},
  url = {https://doi.org/10.66721/s1pfd068},
  note = {CC BY-NC},
}
RIS
TY  - JOUR
TI  - The dimension of the PMHF functional safety metric of ISO 26262 standard
AU  - Dmitriy Shevchenko
AU  - Victor Netes
AU  - Alexander Starovoitov
PY  - 2026
DA  - 2026/06/01
JO  - Reliability: Theory & Applications
DO  - 10.66721/s1pfd068
UR  - https://doi.org/10.66721/s1pfd068
AB  - The ISO 26262 functional safety metric PMHF, which characterizes the probabilistic properties of random hardware failures, is discussed. The PMHF metric is used to determine the automotive safety integrity level (ASIL). The disadvantages of determining this metric and the inaccuracy associated with the specified dimension [1/hour] are shown. According to the authors of the article, the PMHF metric (the average operational lifetime probability of a dangerous hardware failure per hour) is dimensionless. Reasonable arguments are given that the dimension of the PMHF metric cannot differ from the dimension of the averaged probabilities.  The paper indicates the possible reason for the inaccuracy, and shows the correct way to calculate PMHF, which involves using not the operational lifetime (with a dimension of [hour]), but a dimensionless number of 1-hour time intervals within the device’s operational lifetime.
SN  - 1932-2321
ER  -