This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Fully Integrated IVT-Regenerative Braking
Technical Paper
2014-01-1727
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
It is very important to note that most present-day CVT's drive with a friction element. Unlike gears that can be produced with any size necessary for the torque load they must transfer, CVT's are limited in torque capacity and are only marginally suitable for small vehicle applications. A system is described using two variable-inertia flywheels to not only supply the heavy torque requirements during acceleration of a vehicle but also operate in reverse capturing the otherwise wasted decelerating torque (I.E. braking torque). This system (called Kinetic Energy Power Transmission System or KEPTS) provides all of the documented benefits of the use of an IVT for motor vehicle acceleration and also incorporates regenerative braking. The significance of the system is that besides providing a complete KERS (kinetic energy recovery and storage) system, all accelerating and braking torque is provided by the two variable-inertia flywheels, thus allowing the main motive engine (ICE, electric traction motor, gas turbine, etc.) to operate at a fixed angular velocity (rpm) isolated from large torque variances, and the CVT elements can be minimized in size (I.E. low-torque).
Mechanical (flywheel) kinetic energy storage is a formidable contender for regenerative braking systems and this is particularly the case for ICE (internal combustion engines) where few alternatives exist. Regenerative braking should be aggressively pursued for those vehicles with a rapid driving cycle (frequent start-stop cycles). The competing technology for all-electric vehicles is ultra-capacitors. When flywheel technology is implemented with an efficient, high-torque infinitely-variable transmission (IVT) a high percentage of the vehicle kinetic energy normally lost to friction braking systems can be returned to the vehicle during a brake-stop-launch cycle. Overall fuel use is then primarily determined by rolling resistance and air drag.
Recommended Content
Authors
Topic
Citation
Gramling, J., "Fully Integrated IVT-Regenerative Braking," SAE Technical Paper 2014-01-1727, 2014, https://doi.org/10.4271/2014-01-1727.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 |
Also In
References
- Sahay Kuldeep & Dwivedi Bharti Energy Storage Technology for Performance Enhancement of Power Systems Institute of Engineering & Technology Lucknow, Uttar Pradesh Technical University, Department of Electrical Engineering
- Mindl Pavil Hybrid Drive Super-Capacitor Energy Storage Calculation CVUT-FEL Research Center of JB, Technika2 166 27 Praha 6, Czech Republic
- Patel Prachi A Battery-Ultracapacitor Hybrid Technology Review (MIT) Online 10 January 2011
- Hamilton Tyler Battery Breakthrough Technology Review (MIT) Online 22 January 2011
- Energy Use in Cars 4: Regenerative Braking Systems University of British Columbia C21 Physics Teaching for the 21 st Century http://c21.phas.ubc.ca 25 May 2010
- Hydraulic / Compressed Gas Regenerative Braking: Eaton Corporation Hydraulic Launch Assist http://www.eaton.com/EatonCom/ProductsServices/Hybrid/SystemsOverview/HydraulicHLA/index.htm 28 August 2009
- Wikipedia Energy Conversion Efficiency http://en.wikipedia.org/wiki/Energy_conversion_efficiency#cite_note-1
- Hydraulics & Pneumatics Hydrostatic Transmissions http://www.hydraulicspneumatics.com/200/FPE/Hydraulics/Article/True/6450/Hydraulics
- Gramling , J.T. ; Martin , J.C. Kinetic Energy Storage Device U.S. Patent 8,006,764 August 30 2011
- Fussner , D. R. , Singh , Y. P. Design of Input Coupled Split Power Transmissions, and Their Characteristics Transactions of the ASME 126 550 May 2004 10.1115/1.1711825
- Fussner D.R. , Singh Y.P. Design of Input Coupled Split Power transmissions, Arrangements, and Their Characteristics 10.1115/1.1711825 Journal of Mechanical Design May 2004 126 543 545
- Csoban , Attila ; Kozma , Mihaly Prof. Dr. Tooth Friction Loss in Simple Planetary Gears Budapest University of Technology and Economics 7 th International Multidisciplinary Conference 2007 1224-3264