1 Automation, Department of Electrical Engineering, Technical University of Denmark2 Department of Electrical Engineering, Technical University of Denmark3 Aalborg University
The topic of this paper is systems that need be designed such that no single fault can cause failure at the overall level. A methodology is presented for analysis and design of fault-tolerant architectures, where diagnosis and autonomous reconfiguration can replace high cost triple redundancy solutions and still meet strict requirements to functional safety. The paper applies graph-based analysis of functional system structure to find a novel fault-tolerant architecture for an electrical steering where a dedicated AC-motor design and cheap voltage measurements ensure ability to detect all relevant faults. The paper shows how active control reconfiguration can accommodate all critical faults and the fault-tolerant abilities are demonstrated on a warehouse truck hardware.
Microelectronics Engineering, 2006, Vol 46, Issue 9-11, p. 1421-1432