The second wave in automotive ISO 26262 analysis: Page 4 of 6

February 03, 2020 //By Jamil Mazzawi and David Kelf
ISO 26262 analysis
It has become well known that the analysis required for the Automotive ISO 26262 Functional Safety Standard involves lengthy and laborious fault analysis, performed using outdated fault simulation designed for manufacturing test quality grading.

New fault analysis solutions target the ISO 26262 automotive requirements, eliminating unnecessary processing legacies left over from manufacturing fault simulation. It has applied separate optimizations that make use of fault pruning and collapsing techniques as well as parallel processing opportunities. Finally it has leveraged formal verification and performance-simulation algorithms to produce an entirely new engine that can offer great performance improvement.

By accelerating the fault simulation process, the FMEDA metrics based on stuck-at-1/0 hard errors, may be calculated more quickly. In the case of Optima, this is an acceleration of an order of magnitude or more. In addition, the “fault list” (the faults that must be examined) may be optimized using a range of algorithms. Formal techniques allow this list to be pruned based on the impact of the fault condition, as well as more standard techniques such as fault collapsing, further accelerating execution.

This allows fault simulation for the existing FMEDA process to be accomplished in hours rather than weeks. Given this, it is possible to eliminate statistical approximations to system level fault tolerance, and instead perform exact measurements. It is also possible to try various options with different safety mechanisms and experiment to optimize the design itself for power consumption and performance, while still maintaining ASIL-D tolerance.

A major issue with the FMEDA process is tracking down and improving coverage issues. Closing fault coverage can be a laborious and time-consuming activity, which involves adjusting either the test vectors or the design itself. Improved fault analysis allows various coverage inspection techniques to be applied efficiently, driving for the automated improvement of coverage closure.

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