The top-level safety requirement defined for each hazardous event found in the HARA. It is phrased like "prevent unintended sudden acceleration" and inherits the ASIL of that event.
Japanese name: 安全目標
Safety goal appears in 4 practice questions across 1 topic, including Automotive Semiconductors and Functional Safety.
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.
Answer: B. 1×10⁻⁸ /h
1 FIT is one failure per 10⁹ hours, or 1×10⁻⁹ /h. Therefore 10 FIT is 10 × 10⁻⁹ = 1×10⁻⁸ /h. PMHF (Probabilistic Metric for random Hardware Failures) is the probability per hour, averaged over the vehicle's service life, that a safety goal is violated due to random hardware failures. Target guidelines are less than 100 FIT (10⁻⁷ /h) for ASIL B and C, and less than 10 FIT for ASIL D.
A safety goal is a top-level safety requirement defined at the vehicle level to prevent a hazardous event identified in HARA.
Which correctly describes a "safety goal" in ISO 26262?PMHF (Probabilistic Metric for random Hardware Failures) is the probability per hour, averaged over the vehicle's service life, that a safety goal is violated due to random hardware failures.
For PMHF, the metric for the probability that a safety goal…SPFM indicates how few of the safety-related faults are single-point faults, which by themselves lead to violation of a safety goal, or residual faults, which remain undetected by safety mechanisms; it is calculated as 1 minus the proportion of their combined failure rate.
Which is the correct target guideline for the single-point …For each part, such as memory, CPU, clock and power supply, failure rates and failure modes such as stuck-at faults and malfunctions are assigned, and the analysis summarizes whether each leads to violation of a safety goal and which safety mechanisms detect how much of it.
Which correctly describes FMEDA (Failure Modes, Effects and…As an Amazon Associate I earn from qualifying purchases.
ASIL (Automotive Safety Integrity Level) SPFM (single-point fault metric) ISO 26262 HARA (hazard analysis and risk assessment) FMEA (failure mode and effects analysis) AEC-Q100 CAN bus Diagnostic coverage ECU (electronic control unit) FTTI (fault tolerant time interval)