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Tire-induced vehicle pull
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Vehicle design.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Vehicle pull is an issue that occurs when the driver has to exert a discerniblesteering torque (pull) for the vehicle to run straight, otherwisea lateral drift takes place. This thesis deals with the straight motion ofroad vehicles, with particular focus on the role played by tire characteristics,road cross slope and interactions between tires and vehicle.A thorough theoretical approach has been adopted, adjusting thePacejka’s formulation for effective axle characteristics and extendingthe linear handling diagram theory. This has allowed to obtain innovativeanalytical expressions, describing the straight-driving slip anglesand steering torque offsets.The analytical expressions have been validated, together with asingle-track model, by means of quasi-static and dynamic simulationsof a full-vehicle model. Moreover, a relationship between tire characteristicsand on-center handling has been described, that relates objectivemetrics with subjective feedback.The obtained analytical expressions can be used by vehicle OriginalEquipment Manufacturers (OEMs) or Tire Suppliers for productdevelopment.

Abstract [sv]

Däckinducerad fordonsavdrift är ett problem som medför att förarenmåste utöva ett märkbart-styrmoment för att fordonet ska köra rakt.Detta examensarbete handlar om bilens avdrift vid körning rakt fram,med särskild fokus på inverkan av däckegenskaper, vägens lateralalutning och samverkan mellan däck och fordon.Ett grundligt teoretiskt tillvägagångssätt har valts: Pacejkas formuleringav effektiva axelegenskaper har anpassats, och den linjära handlingdiagram teorin har expanderats. Detta har gjort det möjligt att erhållainnovativa analytiska ekvationer som beskriver de avdriftsvinklaroch styrmoment som krävs för att fordonet ska färdas rakt fram.De analytiska ekvationerna har validerats, med hjälp av en cykelmodellsamt med kvasi-statiska och dynamiska simuleringar av enhelfordonsmodell. Dessutom har ett samband mellan däckegenskaperoch kursstabilitet tagits fram, som relaterar objektiva parametrar medsubjektiv feedback.De erhållna analytiska ekvationerna kan användas av fordonstillverkareoch däckleverantörer för produktutveckling.

Place, publisher, year, edition, pages
2018. , p. 150
Series
TRITA-SCI-GRU ; 2018:289
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-243283OAI: oai:DiVA.org:kth-243283DiVA, id: diva2:1285502
External cooperation
Politecnico di Milano
Examiners
Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-04-05Bibliographically approved

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CiteExportLink to record
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