A Configuration for a Continuously Variable Power-Split Transmission in Hybrid-Electric Vehicle Applications 2004-01-0571
Continuously variable transmissions (CVTs) are usually used in small vehicles due to power limitations on the variable elements. Continuously variable power-split transmissions (CVPST) were developed in order to reduce the fraction of power passing through the variable elements [1,2]. The configuration presented in this paper includes a planetary gear train (PGT), which in combination with the CVT allows the power to be split and therefore increase the power envelope of the system. The PGT also provides a branch that can be used in a hybrid electric vehicle (HEV) operation through an electric motor.
A conceptual design of a CVPST for a HEV is presented in this paper. The objectives are to show the different operational modes, with diagrams, perform a power analysis, develop the velocity and force equations and finally show the performance of the system with an example application.
The results of this conceptual design study may help to extend CVT applications in the automotive industry for light duty applications such as pickup trucks and Sport Utility Vehicles (SUV).
Citation: Gomez, M., Mucino, V., Clark, N., and Smith, J., "A Configuration for a Continuously Variable Power-Split Transmission in Hybrid-Electric Vehicle Applications," SAE Technical Paper 2004-01-0571, 2004, https://doi.org/10.4271/2004-01-0571. Download Citation
Miguel M. Gomez, Victor H. Mucino, Nigel Clark, James E. Smith
Department of Mechanical and Aerospace Engineering West Virginia University
SAE 2004 World Congress & Exhibition
Advanced Hybrid Vehicle Powertrains 2004-SP-1833