One of the key benefits of E2E protection is that the Quality Managed (QM) medium does not need to meet ASIL requirements for hardware random faults. This means that any random fault would be captured by the E2E mechanism, assuming the appropriate mechanisms are used (such as the correct profile as per AUTOSAR). However, the risk of systematic faults remains and must be addressed.
To mitigate the risk of systematic faults, time sync is often used to compare throughput time and ensure it is within range. With network stacks and switches handling traffic on a FIFO (first in, first out) basis, this can mitigate the risk. However, a residual risk, which is systematic, could be that the software handling the safety data uses a separate buffer from that used for time sync. In this case, time sync would indicate the delay is okay but data would still be delayed. Moreover, if priority-based traffic is dynamic and suddenly causes safety traffic to be queued with cumulative delays, this can lead to a dangerous situation.
E2E protection is an important aspect of ensuring the safety of vehicles on the road. It addresses both random and systematic faults, and it is important to understand the risks associated with systematic faults, such as undetected cumulative delays. By implementing solutions such as ASIL decomposition, failure analysis, testing with fault injection, and re-testing with any changes in QM hardware or software, car manufacturers can ensure the safety of their vehicles on the road. Contact a DConsulted representative today to learn how.
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