Thermodynamic modelling of clutch system for Mild Hybrid, Full Hybrid and Plug-in Hybrid on-axis module

The climate emergency due to the growing concentration of Greenhouse Gases (CO₂ above all) in the atmosphere and the tightening legislative regulations in terms of emissions represent the triggering point of the hybridization and electrification trends in recent years, aimed at moving more and more towards sustainable mobility solutions. The goal of this thesis work is to develop a lumped parameters model aimed at predicting the thermodynamic behaviour of the lubricating oil and the clutches of a P2 on-axis module for Mild Hybrid, Full Hybrid and Plug-in Hybrid vehicles. At first, an introduction to the legislative background and to the main hybrid architectures has been discussed. In the first chapter, the structure and the working principle of the module have been described. In the second chapter, the results of three equivalent models obtained through the MATLAB/Simulink suite have been illustrated for different operating conditions of practical interest. Finally, in the third chapter, a comparison with the results coming from the AVL CRUISE™ M software has been made. The similarities and the differences between the aforementioned models have been critically analysed in order to find the parameters that mostly affect the thermodynamic behaviour of the system. The thesis was carried out in collaboration with the Hybrid Team of the Dayco Europe S.r.l. plant located in Ivrea (TO).