Faults and their influence on the dynamic behaviour of electric vehicles
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
The increase of electronics in road vehicles comes along with a broad variety of possibilitiesin terms of safety, handling and comfort for the users. A rising complexityof the vehicle subsystems and components accompanies this development and has tobe managed by increased electronic control. More potential elements, such as sensors,actuators or software codes, can cause a failure independently or by mutually influencingeach other. There is a need of a structured approach to sort the faults from avehicle dynamics stability perspective.This thesis tries to solve this issue by suggesting a fault classification method and faulttolerantcontrol strategies. Focus is on typical faults of the electric driveline and thecontrol system, however mechanical and hydraulic faults are also considered. Duringthe work, a broad failure mode and effect analysis has been performed and the faultshave been modeled and grouped based on the effect on the vehicle dynamic behaviour.A method is proposed and evaluated, where faults are categorized into different levelsof controllability, i. e. levels on how easy or difficult it is to control a fault for the driver,but also for a control system.Further, fault-tolerant control strategies are suggested that can handle a fault with acritical controllability level. Two strategies are proposed and evaluated based on thecontrol allocation method and an electric vehicle with typical faults. It is shown thatthe control allocation approaches give less critical trajectory deviation compared to noactive control and a regular Electronic Stability Control algorithm.To conclude, this thesis work contributes with a methodology to analyse and developfault-tolerant solutions for electric vehicles with improved traffic safety.
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , x, 54 p.
Trita-AVE, ISSN 1651-7660 ; 2013:48
fault classification, vehicle dynamics, electric vehicle, failure, fault-tolerant control, reconfiguration, fault handling
Research subject Järnvägsgruppen - Fordonsteknik
IdentifiersURN: urn:nbn:se:kth:diva-131213OAI: oai:DiVA.org:kth-131213DiVA: diva2:654994
2013-10-18, Hugin, Teknikringen 8, KTH, Stockholm, 10:00 (English)
Stensson Trigell, Annika, ProfessorDrugge, Lars, Associate Professor
QC 201310102013-10-102013-10-092013-10-10Bibliographically approved
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