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Analyzing the Impact of Data Errors in Safety-Critical Control Systems

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>2003
<mark>Journal</mark>IEICE Transactions on Information and Systems
Issue number12
Number of pages11
Pages (from-to)2623-2633
Publication StatusPublished
<mark>Original language</mark>English


Computers are increasingly used for implementing control algorithms in safety-critical embedded applications, such as engine control, braking control and flight surface control. Consequently, computer errors can have severe impact on the safety of such systems. Addressing the coupling of control performance with computer related errors, this paper develops a methodology for analyzing the impacts data errors have on control system dependability. The impact of a data error is measured as the resulting control error. We use maximum bounds on this measure as the criterion for control system failure (i.e., if the control error exceeds a certain threshold, the system has failed). In this paper we a) develop suitable models of computer faults for analysis of control level effects and related analysis methods, and b) apply traditional control theory analysis methods for understanding the impacts of data errors on system dependability. An automobile slip-control brake-system is used as an example showing the viability of our approach.