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Automation of Electrical Fault Induction for Safety Testing of the Power Train Software in Heavy Vehicles
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Automatisering av elektrisk felinducering försäkerhetstestning av drivlinans mjukvara i tunga fordon (Swedish)
Abstract [sv]

En av de främsta prioriteringarna vid utveckling av mjukvara till tunga lastbilar på Scania är att verifiera att lastbilens beteende är säkert. Således spenderas mycket tid på säkerhetstester vars syfte är att verifiera att ny mjukvara inte medför säkerhetskritiska förändringar i fordonets beteende. De säkerhetstester som behandlas i rapporten testar beteendet av mjukvaran i motorns styrenhet när den utsätts för elektriska fel. Bakgrunden till varför säkerhetstesterna genomförs beskrivs i ett säkerhetskritiskt och juridiskt perspektiv samt vilken testmetodik som används. Dessutom tydliggörs vilken del av utvecklingsprocessen som testerna genomförs i. Slutligen utvecklas ett automatiskt testsystem för att effektivisera samt höja kvalitén av säkerhetstesterna som genomförs på Scania. De elektriska fel som kan induceras med det automatiska testsystemet är kortslutning avstyrenhetens kablage mot lastbilens batteri samt kabelbrott. Resultaten ifrån tester genomförda på det automatiska testsystemet visar att säkerhetstesterna utförda manuellt respektive automatiskt är ekvivalenta. Vidare så minskar exekveringstiden för ett testfall signifikant samt att valideringsmöjligheterna förbättras genom bättre dokumentation och ökad repeterbarhet.

Abstract [en]

In the development of software for heavy-duty trucks at Scania one of the main priorities is to ensure that the behavior of the truck is safe. Hence, much time is spent on safety tests where the purpose is to verify that new software does not imply safety critical changes in the behavior of the vehicle. The safety tests treated in this thesis are about testing the reliability of thesoftware in the electronic control unit while it is exposed to electrical malfunctions.The background of why the safety tests are performed is describedin a legal and safety critical perspective and also what test methodology thatis used. Further the phase in which the safety tests are carried out in thedevelopment process is highlighted.Finally, an automated test system is developed for increasing the e-ciency as well as the quality of the safety tests performed at Scania. Theelectrical malfunctions that are possible to induce with the automated test system are short-circuiting to battery of the truck and disconnections. The results from the tests performed on the automated test system indicate that the safety tests that are performed manually respectively automatically are equivalent. Further, the results show that the time to perform the tests signicantly decreases and the possibility for validation is improved through better documentation and increased repeatability.

Place, publisher, year, edition, pages
2013. , 64 p.
Series
MMK 2013:41 MDA 451
Keyword [sv]
Inducering av elektriska fel, automatisering, testning av drivlinans mjukvara, säkerhetstest, tunga fordon.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-141656OAI: oai:DiVA.org:kth-141656DiVA: diva2:697481
Supervisors
Examiners
Available from: 2015-10-14 Created: 2014-02-18 Last updated: 2015-10-14Bibliographically approved

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