ANALYSIS TYPE / 08
Diagnostic Coverage · SPFM · LFM · PMHF Verification
Overview
FMEDA extends FMEA with quantitative failure rate data and diagnostic coverage analysis to verify that the safety mechanism architecture achieves the required SPFM, LFM, and PMHF targets specified by ISO 26262 for each hardware element. Our FMEDA process uses Ansys medini analyze to build component-level failure mode models with failure rate data, classify each mode against the safety mechanism architecture, and compute diagnostic coverage, SPFM, LFM, and PMHF contributions for every hardware element in the safety-relevant function.
Industries Served
Standards
Key Aspects
Classifying each failure mode as safe or dangerous, and as detected or undetected by the safety mechanism — the foundation for all subsequent metric calculations.
Computing the DC for each safety mechanism by comparing its ability to detect dangerous failure modes against the total dangerous failure rate of the monitored element.
Calculating the Safe Failure Fraction and Latent Fault Metric for each hardware element and verifying compliance with the minimum thresholds required for ASIL B, C, and D.
Accumulating the residual risk contribution of each undetected dangerous failure mode to the system-level PMHF — confirming the overall target is met.
Connect with our functional safety team to define the right approach, timeline, and tooling for your project.
