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Tesi etd-05082009-160701

Thesis type
Tesi di dottorato di ricerca
Hybrid propulsion systems for land vehicles
Settore scientifico disciplinare
Corso di studi
Relatore Prof. Ceraolo, Massimo
Parole chiave
  • hybrid vehicle
  • railway vehicle
  • dual-mode
  • battery
Data inizio appello
Data di rilascio
Riassunto analitico
Hybrid propulsion systems for land vehicles have been widely studied for<br>decades, as systems that combine conventional and electric propulsion<br>architectures, with the main aim of fuel consumption and pollution<br>emissions reduction.<br>As far as road vehicles are concerned, both four-wheel vehicles, such as<br>buses or cars, and two wheelers, such as scooters or motorcycles, have<br>been studied, prototyped, and, in some cases, made commercially<br>available.<br>In particular the use of hybrid vehicle for the local transport of<br>passengers or goods is very interesting, due to the growing necessity to<br>have cleaner and more economic transportation systems.<br>In the railways sector the introduction of hybrid propulsion is also<br>possible, in case of small trains with a behaviour similar to urban road<br>vehicles, with mission profiles consisting of frequent acceleration /<br>brakings and stops, for example regional trains used for passengers<br>transport and switching locomotives.<br>In this thesis the studies carried out on the hybrid propulsion system for<br>land vehicles are reported in a systematic way, and the main related<br>issues are discussed.<br>More in detail, in chapter 1 the concept of hybrid propulsion is<br>introduced, definitions and classifications are provided and there are<br>also some examples of their realization listed.<br>Chapter 2 approaches the problem of optimising energy consumption<br>onboard hybrid vehicles in a general way, considering the main issues to<br>be solved in their conceptuality, and therefore often abstracted from the<br>actual structure of the particular drive-train considered.<br>Chapter 3 shows the results of experimental tests carried out on<br>samples of batteries for hybrid-electric vehicles of different technologies<br>(Lead-acid, Nickel Metal Hydride, and Lithium ion) to evaluate their<br>energy efficiencies, when subjected to small cycles like a real operating<br>condition on hybrid vehicles.<br>Chapter 4 describes a hybrid drive train simulation program with a userfriendly<br>man machine interface, developed in Matlab-Simulink™<br>environment. The program is able to simulate series-hybrid drive trains of either road vehicles or trains. The simulator is certainly a necessary<br>tool in the design phase for the choice of architecture and dimensioning<br>of the various subsystems which to test the energy behaviour of vehicles<br>as a result of different control strategies implemented.<br>Chapter 5 shows the possibility of using hybrid drive-trains for propulsion<br>of small electric trains. The study is based on a project commissioned by<br>Trenitalia (the main Italian rail transport company), regarding regional<br>trains (ALn668) operating in non-electrified lines, and shunter<br>locomotives (D141) operating in the main rail stations.<br>Finally, in chapter 6 the study of a dual-mode propulsion system for<br>railway vehicles is showed; technical and economical analyses of<br>regional passenger dual-mode trains in the Italian railway network are<br>also expounded.