A new hybrid-electric CVPST system has been proposed in the paper. This design has the advantage of having the second power source (electric motor) connected to the output shaft of the CVT. Using this configuration, when the electric motor is working, a decreased amount of power flows from the engine through the variable elements and therefore friction loses are reduced. Since a variable transmission is being used, the contention can be made that the IC engine spends more time in its optimum operating range. Yet, from previous work it is also known that CVTs are less efficient as speed increases. However, from the belt force plot results for the light duty application example, it can be seen that as the vehicle gains speed the belt force decreases significantly, which in turn reduces the power flow through the variable transmission and thus reduces the friction losses in the variable elements. It is suggested that the work of this paper will help demonstrate a proposal to extend power limitations in CVTs and find alternate applications for this type of transmission in the automotive industry.
A configuration for a continuously variable power-split transmission in hybrid-electric vehicle applications
Konfiguration eines stufenlosen leistungsverzweigten Antriebs zur Anwendung in hybridelektrischen Fahrzeugen
2004
7 Seiten, 15 Bilder, 1 Tabelle, 5 Quellen
Conference paper
English
British Library Conference Proceedings | 2004
|Automotive engineering | 2004
|SAE Technical Papers | 2004
|British Library Conference Proceedings | 2004
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