A hybrid drive train significantly improves energy efficiency of ground vehicles. While numerous auxiliary hybrid power sources have been researched, few are capable of the energy and power density of a flywheel coupled with a continuously variable mechanical transmission. The primary challenge of a flywheel hybrid system is a transmission capable of coupling a high speed flywheel to the drive train of the vehicle. A novel solution to this challenge is a switch-mode continuously variable transmission that utilizes a rapidly switching clutch to transmit power. This system, the mechanical analog of a DC-DC boost converter circuit, utilizes a flywheel, a high frequency clutch, an anti-reversing ratchet, and a spring to vary the output torque. The switch-mode continuously variable transmission is demonstrated through an idealized finite difference model, created from the dynamic system of equations. The model is used to demonstrate the system behavior in a passenger car subjected to road loads in various conditions. The output of the model demonstrates pulses in the output torque as a result of the rapidly switching clutch. This output ripple in is smoothed to an acceptable level by the torsion spring. From this preliminary analysis the on-off continuously variable transmission offers an efficient, energy dense, and power dense hybrid vehicle drive train alternative.
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ASME 2008 International Mechanical Engineering Congress and Exposition
October 31–November 6, 2008
Boston, Massachusetts, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4878-4
PROCEEDINGS PAPER
Switch-Mode Continuously Variable Transmission With Flywheel Energy Storage Available to Purchase
Tyler D. Forbes,
Tyler D. Forbes
Worcester Polytechnic Institute, Worcester, MA
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James D. Van de Ven
James D. Van de Ven
Worcester Polytechnic Institute, Worcester, MA
Search for other works by this author on:
Tyler D. Forbes
Worcester Polytechnic Institute, Worcester, MA
James D. Van de Ven
Worcester Polytechnic Institute, Worcester, MA
Paper No:
IMECE2008-67685, pp. 329-336; 8 pages
Published Online:
August 26, 2009
Citation
Forbes, TD, & Van de Ven, JD. "Switch-Mode Continuously Variable Transmission With Flywheel Energy Storage." Proceedings of the ASME 2008 International Mechanical Engineering Congress and Exposition. Volume 17: Transportation Systems. Boston, Massachusetts, USA. October 31–November 6, 2008. pp. 329-336. ASME. https://doi.org/10.1115/IMECE2008-67685
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