Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Probabilistic Fault Isolation in Embedded Systems Using Prior Knowledge of the System
KTH, School of Electrical Engineering (EES), Automatic Control.
2008 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Nowadays truck engines are controlled by an embedded control system which is a specially designed computer system. It is important that the embedded system is robust against possible faults that could appear when driving the vehicle since faults may cause the vehicle to stop unintended or even worse, crash. To prevent this tests in the system are designed to detect faults and further isolate the faulty behaviors for components. After the isolation fault tolerant control software is used to control the engine in the presence of the faults until the faults have been attended to by a mechanic.

In this thesis an application of a probabilistic isolation method that ranks possible faults on their likeliness is presented. The method uses a Bayesian approach for the probability computations based on prior knowledge for ranking the faults in order to improve the result.

The probabilistic isolation method is analyzed to show how the isolation performs and how the isolation differs when changing different parameters for the isolation such as test sensitivities and prior knowledge.

Different solutions for problems that appear due to different circumstances are also described and evaluated. The solutions handle cases such as limited RAM and execution time, multiple faults and incomplete observations.

The result shows a good performance for the probabilistic isolation method and the different solutions. However the method still needs further developments in order to achieve adequate trust for an implementation in vehicles. Future work is proposed and should include further improvements in the isolation of multiple faults.

Place, publisher, year, edition, pages
2008. , 76 p.
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:kth:diva-105881OAI: oai:DiVA.org:kth-105881DiVA: diva2:572709
Subject / course
Automatic Control
Educational program
Master of Science in Engineering
Uppsok
Technology
Examiners
Available from: 2012-12-03 Created: 2012-11-28 Last updated: 2012-12-03Bibliographically approved

Open Access in DiVA

fulltext(692 kB)81 downloads
File information
File name FULLTEXT01.pdfFile size 692 kBChecksum SHA-512
ad86c6bfa6c332a330fce95d3480831cf0bdceaf3229bbb26510a0097383816cd27416affa69d6ac451781894e33b1e2798c4bd16acdbf71bae1a44e2cce7f05
Type fulltextMimetype application/pdf

By organisation
Automatic Control
Control Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 81 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 50 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf