A software package exception inside of a QM application SWC corrupts the shared memory region used by an ASIL D protection SWC (spatial interference – if MPU defense is absent or misconfigured).
A brief circuit from the motor driver IC results in overcurrent to the shared electric power bus – which damages the monitoring MCU’s electrical power supply input, disabling the checking functionality.
DFA summary: The twin-channel architecture presents ample independence for ASIL D decomposition, Together with the shared connector recognized to be a residual coupling factor tackled by way of connector derating and dependability analysis.
Shared connector – EVALUATED: both equally channels share the most crucial ECU connector; connector failure could have an effect on each channels (residual coupling issue – accepted with more connector reliability analysis).
A temperature exceedance party causes both redundant temperature sensors to drift outside of specification at the same time because they are mounted in exactly the same thermal atmosphere.
This difference is frequently baffled in apply – a lot of engineers use FFI and independence interchangeably, but They are really different properties with various scope.
However, if a common root cause can cause both failures, the blended probability gets much better – equal to your probability of The only root bring about taking place. This radically increases the threat of basic safety aim violation as compared to just what the unbiased failure calculation predicts.
Mechanics ought to not only certainly be a “replacer of parts” but they must be capable of prognosis to determine why a part failed prematurely. Under are two diverse applications accessible to assist you to establish motor bearing failures.
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Repeated identical situations in numerous branches from the fault tree point out dependent failure prospective. The DFA analyst should really systematically overview the FMEA and FTA outputs for these indicators.
DFA is needed Anytime the safety strategy relies on the independence of features or on independence from interference between things. Especially, DFA is necessary for ASIL decomposition (to verify adequate independence among decomposed aspects – Part 9 Clause five), for coexistence of factors with distinctive ASILs (to verify FFI in between aspects of various ASILs sharing means – Part 9 Clause six), for verification of protection system performance (to validate that dependent failures are unable to concurrently disable both of those the monitored functionality and the security system), and for virtually any architecture where redundancy is claimed as a security evaluate (to confirm which the redundancy isn't defeated by dependent failures).
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The cascading failure analysis examines how a fault in one element can propagate to another. For each interface concerning elements inside the pair, the analysis evaluates what failure modes of ingredient A could propagate through the interface to induce a failure in aspect B, irrespective of whether protection limitations exist to include the fault within ingredient A, and just what the consequence of fault propagation would be on the safety operate.
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