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What is SOTIF (safety of the intended functionality)?

The concept that addresses hazards arising without any component failure, from sensor performance limits, insufficient specifications or reasonably foreseeable misuse. It is standardized as ISO 21448 and is central to developing automated driving and driver-assistance systems.

Japanese name: SOTIF(意図した機能の安全性)

SOTIF (safety of the intended functionality) appears in 1 practice question across 1 topic, including Automotive Semiconductors and Functional Safety.

Field: Automotive Semiconductors and Functional Safety

Try it: questions about SOTIF (safety of the intended functionality)

Which of the following problems is addressed mainly by SOTIF (ISO 21448, Safety of the Intended Functionality) rather than ISO 26262 (functional safety)?

  1. AA component in the radar transmitter circuit degrades and fails after years of use under stresses such as temperature changes, so objects ahead can no longer be detected
  2. BBecause of an error in the brake control software, the braking force is miscalculated under specific conditions
  3. CA camera that has not failed cannot recognize a pedestrian ahead due to strong backlight, and automatic emergency braking does not activate
Show answer and explanation

Answer: C. A camera that has not failed cannot recognize a pedestrian ahead due to strong backlight, and automatic emergency braking does not activate

SOTIF addresses hazards that arise even when no component has failed, from sensor performance limitations, insufficient recognition algorithms, inadequate specifications, foreseeable misuse and the like. Failing to recognize a pedestrian in backlight is a problem caused not by a failure but by a functional limitation, so it falls under SOTIF. Failure due to component degradation is a random hardware failure and a software error is a systematic failure; both are handled by ISO 26262. In SOTIF, testing and simulation are used to reduce unknown hazardous scenarios.

SOTIF (safety of the intended functionality) in the explanations

Questions that mention SOTIF (safety of the intended functionality) (1)

  1. Which of the following problems is addressed mainly by SOTIF (ISO 21448, Safety of the Intended Functionality) rather than ISO 26262 (functional safety)?

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Related terms

ISO 26262 AEC-Q100 ASIL (Automotive Safety Integrity Level) CAN bus Diagnostic coverage ECU (electronic control unit) FTTI (fault tolerant time interval) HARA (hazard analysis and risk assessment) HAST (highly accelerated stress test) Lockstep CPU

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