The shortest time from the occurrence of a fault to a hazardous event if no safety mechanism acts. A safety mechanism must complete detection of the fault and transition to a safe state within the FTTI.
Japanese name: FTTI(フォールトトレラント時間間隔)
FTTI (fault tolerant time interval) appears in 2 practice questions across 1 topic, including Automotive Semiconductors and Functional Safety.
Answer: C. The minimum time from a fault occurring until a hazardous event could occur if no countermeasure were taken; fault detection and transition to a safe state must be completed within this time
FTTI is the minimum time from the occurrence of a fault until a hazardous event would occur if safety mechanisms did not act. A safety mechanism must keep the sum of the time to detect the fault and the time from detection to reaching a safe state, for example by shutting off outputs, within the FTTI. For example, for a function with an FTTI of several tens of ms, a diagnosis once every few seconds is too slow. It is a different concept from MTTF, which represents component life, or from repair time.
FTTI is the minimum time from the occurrence of a fault until a hazardous event would occur if safety mechanisms did not act.
Which correctly describes the fault tolerant time interval …Failure rate, diagnostic coverage and FTTI are quantities used after the ASIL is determined, to evaluate whether a design meets its requirements.
In ISO 26262, which correctly lists the three factors evalu…As an Amazon Associate I earn from qualifying purchases.
ISO 26262 Safety mechanism MTTF (mean time to failure) ASIL (Automotive Safety Integrity Level) HARA (hazard analysis and risk assessment) Diagnostic coverage AEC-Q100 CAN bus ECU (electronic control unit) HAST (highly accelerated stress test)