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Automotive Semiconductors and Functional Safety

Which correctly describes a "safety goal" in ISO 26262?

  1. AA top-level safety requirement determined from the results of hazard analysis and risk assessment, expressed for example as "do not cause unintended sudden acceleration," and assigned an ASIL
  2. BA target number of safety-related tests to be performed within a development project, where more tests are judged to mean higher safety
  3. CA target failure-rate value set for each component, independent of ASIL, with the same value used for all components
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Answer: A. A top-level safety requirement determined from the results of hazard analysis and risk assessment, expressed for example as "do not cause unintended sudden acceleration," and assigned an ASIL

A safety goal is a top-level safety requirement defined at the vehicle level to prevent a hazardous event identified in HARA. For electronic throttle control, for example, it is expressed as "do not cause unintended sudden acceleration," and it inherits the ASIL of that hazardous event. The safety goal is broken down step by step into functional safety requirements, technical safety requirements, and hardware and software requirements. It is neither a target number of tests nor a uniform failure-rate value unrelated to ASIL.

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More Automotive Semiconductors and Functional Safety questions

  1. Which correctly pairs the descriptions of random hardware failures and systematic failures as distinguished in ISO 26262?
  2. For PMHF, the metric for the probability that a safety goal is violated due to random hardware failures, the target guideline for ASIL D is less than 10 FIT. What is this expressed as a probability per hour?
  3. Which is the correct target guideline for the single-point fault metric (SPFM) required for ASIL D?
  4. Which is the most appropriate example of a latent fault in ISO 26262?
  5. The total failure rate of safety-related hardware is 1000 FIT, of which single-point faults and residual faults (faults that remain undetected by safety mechanisms) total 5 FIT. What is the single-point fault metric (SPFM)?