This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Powertrain Model for Selection of Reduction Ratio and Estimation of Energy Requirement
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 01, 2014 by SAE International in United States
Annotation ability available
This paper presents a mathematical model of an electric driveline consisting of one battery pack, two independent Permanent Magnet DC (PMDC) motors and motor-controllers and two fixed-ratio planetary gearboxes, all located inside the rear frame of the vehicle.
The proposed analysis has been performed with the objective of: (i) Determination of acceleration run time for a straight patch of 75 meters; (ii) Determination of lap times and energy consumption for endurance track of 23 laps. A model of a PMDC motor and motor controller has been developed based on response analysis by conducting experiments on a jig setup. The motor controllers are compared for two control modes- Speed mode and Torque mode. A simplified race car model for longitudinal vehicle dynamics is derived from forces acting on the car including the effect of losses due to drag forces, rolling resistance, transmission inefficiency and inertial losses due to rotary elements. The effect of reduction ratio on acceleration run times and endurance lap times and energy consumption is compared and an optimum gear ratio is finalized considering acceleration performance and mass and inertia of resulting gearbox. An estimate of maximum energy utilized during the endurance run is obtained based on motor current profile and speed-torque characteristics, and the battery pack size and configuration is decided accordingly. The cells for the battery pack have been selected after extensive market research based on constraints like energy requirement, weight and maintenance cost.
This concludes the entire mathematical model for the driveline of the vehicle pertaining to the most optimized performance.
CitationSakhalkar, S., Dhillon, P., Bakshi, S., Kumar, P. et al., "Powertrain Model for Selection of Reduction Ratio and Estimation of Energy Requirement," SAE Technical Paper 2014-01-1781, 2014, https://doi.org/10.4271/2014-01-1781.
- FSAE International, http://www.fsae.com.
- Agni Motors Official Website, http://www.agnimotors.com.
- Kelly Controllers, http://www.kellycontroller.com.
- Marquenie, L. “Design of an Energy Efficient High Performance Drive Train,” Master's Thesis, Eindhoven University of Technology, Eindhoven, March 2010.
- Bakker, T., “Design of a Drivetrain for a FS Race Car,” Bachelor End Project, Eindhoven University of Technology, Eindhoven, March 2009.
- “McGill University Hybrid Design Review,” Mechanical Engineering Department, McGill University, 2008.
- Haffner, D., “Hybrid Design Final report, ENGS 199-Hybrid Vehicle Technology,” Dartmouth Formula Racing-Hybrid, Thayer School of Engineering, Dartmouth College, 2006.
- Benson, K.W., Fraser, D.A., Hatridge, S.L., Monaco, C.A., et al., “The Hybridization of a Formula Race Car,” IEEE Vehicle Power and Propulsion Conference pp. 295-299, September 2005, doi:10.1109/VPPC.2005.1554523.
- Borremans, M., Bossche, P., Verbrugge, B., Van Mulders, F., et al., “The Electric Endeavour - Engineering Formation through SYNECTRIC Electric Race Car Development EVS24,” World Electric Vehicle Journal Vol. 3, ISBN 2032-6653, 2009.
- Loveless, E.A., Ludikar, T.J., Meghnath, S., Samson, P.J., “Design, Optimization and Control of Open Wheel Hybrid Race Car,” Gryphon Racing Team, Proceedings of the ENGG 3100: Design III Projects, University of Guelph, 2007.
- Xue, X.D., Cheng, K.W.E., Cheung, N.C., “Selection of Electric Motor Drives for Electric Vehicles,” Power Engineering Conference, AUPEC 2008.
- Gillespie, T. D., “Fundamentals of Vehicle Dynamics,” Society of Automotive Engineers, Inc., Warrendale, PA, ISBN 978-1-56091-199-9, 1992, doi:10.4271/R-114.
- Jazar, R. N., “Vehicle Dynamics: Theory and Applications,” Springer, New York, NY, ISBN 13: 978-0387742434, 2008.
- Agni Motors Official Website, “Agni Performance Graphs 95 and Series (Torque/Power/Eff./RPM vs. Current),” http://www.agnimotors.com/95_Series_Performance_Graphs.pdf.
- Formula Student, “2013 Official Formula Student Rulebook,” http://www.formulastudent.com/formula-student/formula-student-2013/Teams/Rules.
- Jozztek Ltd. Website, http://www.jozztek.com