Abstract
Keywords:x-by-wire, redundancy, reliability analysis, failure mode, effect
The development of safety critical systems is mainly driven by that social demand, that the societies wants to see safer, more reliable vehicles on the roads, which can also handle more complex situations than the human driver can. Redundant electronic systems confront us with new challenges in reliability analysis like handling and defining their backup levels using qualitative and quantitative approaches. Are these reliability analyses appropriate for redundant electronic systems, mostly for electronic brake systems in terms of determining their reliability? Results show that even handling only one failure at a time is legally prescribed, hidden failures or failure combinations can cause unintended effects in systems operation despite of redundancy. That is why qualitative reliability analysis and its structural appearance can be systematic input for the further needed quantitative reliability analysis.