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Digital archive of theses discussed at the University of Pisa

 

Thesis etd-04242007-182625


Thesis type
Tesi di dottorato di ricerca
Author
Greco, Giordano
email address
giordano.greco@magnetimarelli.com
URN
etd-04242007-182625
Thesis title
Dynamics of vehicles with controlled limited-slip differential
Academic discipline
ING-IND/13
Course of study
VEICOLI TERRESTRI E SISTEMI DI TRASPORTO
Supervisors
Relatore Prof. Bicchi, Antonio
Relatore Prof. Guiggiani, Massimo
Keywords
  • controlled limited-slip differential
  • cornering behaviour
  • handling diagram
  • handling surface
  • locked differential
  • oversteer
  • understeer
  • vehicle dynamics
Graduation session start date
21/06/2007
Availability
Partial
Release date
21/06/2047
Summary
This Ph.D. thesis is aimed at analyzing vehicle dynamics in presence of an electronically controlled limited-slip differential and at developing advanced control strategies for the limited-slip differential of sports cars, in order to improve performance, stability and safety. A critical review of the concept of understeer-oversteer for vehicles with locked differential is first presented. The steady-state directional behaviour of rear-wheel drive vehicles fitted with locked differential is theoretically analyzed. Furthermore, the problem of describing the understeer-oversteer behaviour of a general vehicle is addressed taking a fresh perspective, since the new concept of handling surface and a new definition of understeer gradient are presented, this latter being the gradient of the handling surface. The problem of controlling vehicle dynamics by means of electronically controlled limited-slip differentials is then approached. The main handling control problems for sports cars fitted with controlled limited-slip differential are analyzed in detail. An advanced control strategy, developed for the rear electronically controlled limited-slip differential of F1 race cars, is also described.
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