A software program exception inside of a QM application SWC corrupts the shared memory location utilized by an ASIL D protection SWC (spatial interference – if MPU safety is absent or misconfigured).
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Shared connector – EVALUATED: the two channels share the primary ECU connector; connector failure could impact both channels (residual coupling variable – approved with further connector reliability analysis).
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A shared power offer voltage regulator fails – both the principal MCU and the monitoring MCU reduce electrical power at the same time since they both equally depend on precisely the same source.
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Cascading failure analysis: SPI cross-Verify interface – MITIGATED: E2E shielded with CRC-16 and alive counter; timeout detection; failure of SPI won't propagate electrical harm (voltage-minimal signals). Security relay Command – MITIGATED: relay K1 controlled solely by automotive failure analysis checking MCU; primary MCU has no electrical path to regulate or damage the relay circuit.
Action 3 – Assess frequent induce failure likely: For each coupling issue, evaluate irrespective of whether an individual root induce could concurrently affect the two features inside the pair, defeating the assumed independence. Document the analysis from the CCF worksheet.
A Typical Bring about Failure (CCF) occurs when two or maybe more components are unsuccessful simultaneously resulting from just one precise occasion or root bring about — with out just one element’s failure triggering one other’s. The failures are
Dependent Failure Analysis (DFA) is the security analysis that validates the most critical assumptions in the protection architecture – that redundant features are really impartial Which safety mechanisms can't be defeated here by dependent failures. By systematically determining coupling factors, analyzing equally prevalent cause failure and cascading failure opportunity, and verifying the usefulness of security actions, DFA delivers the proof needed to assistance ASIL decomposition, combined-ASIL coexistence, and basic safety system independence promises.
A typical software program library employed by equally the command perform and the checking operate consists of a scientific design and style error that influences the two at the same time.
An electromagnetic interference (EMI) occasion disrupts both equally redundant CAN communication channels at the same time simply because both equally transceivers are on exactly the same PCB with inadequate shielding.
With out rigorous DFA, the security circumstance rests on unverified assumptions – and unverified assumptions are quite possibly the most perilous form of complex financial debt in practical safety.