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FAULT TREE ANALYSIS — SINGLE-FAULT TOLERANCE & MINIMAL CUT SETS
DEDUCTIVE · TOP-DOWN
TOP EVENT
UNINTENDED TORQUE ≥ 20 Nm
INTERMEDIATE EVENT
ERRONEOUS REQUEST
INTERMEDIATE EVENT
INVERTER SELF-DRIVE
AND CONDITION NOT MET — 1 OF 2 INPUTS FAILED
AND CONDITION MET — CUT SET 2 COMPLETE
SYSTEM NOMINAL
MINIMAL CUT SETS
1 · BE1 ∩ BE2 — ORDER 2 — 3.1 FIT
2 · BE3 ∩ BE4 — ORDER 2 — 1.4 FIT
NO ORDER-1 CUT SET — NO SINGLE-POINT FAULT
QUANTIFICATION — RANDOM HARDWARE FAILURE
Σ CUT SETS
4.5 FIT
ASIL D TARGET
< 10 FIT
PASS
10
FIT — FAILURES IN 10⁹ HOURS · CUT SET ORDER = NUMBER OF SIMULTANEOUS FAULTS
FAILURE RATES ILLUSTRATIVE
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CXTECH.ME — C. TRICULESCU
REV. A
FIG. 04 — FAULT TREE
SH. 1/1
IEC 61025 · ISO 26262-9
SI UNITS