Abstract
Keywords:
Reliability, redundant electronic brake system (REBS), FMEA, FTA
ABSTRACT
The evolution of the HGVs’ braking systems tends towards that the pneumatic and mechanic back-up systems are fading away and both the customer and the related safety requirements are fulfilled by electronic and electro-mechanic systems not just because of lower component and installation cost but increased availability. In order to understand the evolution of the analyzed two-electronic-circuit brake-by-wire system it is necessary to get an insight into the state-of-the-art braking system and their redundancy levels (fail-safe, fail-tolerant) since differences can be made among the various system architectures. In an attempt to realize a fail-safe architecture with redundant channels, a fail-safe energy management and redundant controllers have to be developed using a systems engineering approach. Therefore a layered, fail-tolerant architecture is considered. At present it is foreseen to use an architecture, which provides safety critical functions. In order to be able to analyze this opportunity, a hazard analysis will be conducted (partly interface qualitative FMEA, partly quantitative FTA for the identified dangerous events or for multiple failures).