PhD defense Florian Verbelen- A Comparative Study of Mechanical and Electrical Variable Transmissions

08-10-2019 from 17:00 to 19:00
UGent campus Kortrijk
Florian Verbelen
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PhD defense Florian Verbelen

This PhD script focuses on the comparison of the Electrical Variable Transmission (EVT) with the Continuously Variable Transmission (EVT), both at component and system level (vehicle). For this comparison, the following 3 transmissions are chosen: the permanent magnet EVT, the pushbelt CVT and the toroidal CVT.
In a CVT based vehicle, the speed ratio can be changed in a continuous way, which results in a reduced fuel consumption compared to a manual transmission. An EVT has the additional advantage of offering power split capabilities. Therefore, an EVT based vehicle is characterized as a Hybrid Electrical Vehicle (HEV). However, the EVT can also be used as CVT if no energy storage is installed.

From the comparison at component level it is concluded that the pushbelt CVT performs best. However, variable transmissions are used at system level to add an additional degree of freedom, which is used to optimize the efficiency of the system. Hence, system level comparison is important. Based on the comparison of CVT based vehicles (no energy storage), it is shown that the EVT based transmission performs best. If storage is added, the fuel consumption of the EVT based vehicle is further decreased. Moreover, the difference between the Toyota Hybrid System (transmission used in the Toyota Prius) and the EVT based transmission goes up to 13% in favour of the EVT.