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Brake Power Availability Led Optimisation of P0 versus P2 48V Hybrid Powertrain Architectures
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Through improving the 48V hybrid vehicle archetype, governmental emission targets could be more easily met without incurring the high costs associated with increasing levels of electrification. The braking energy recovery function of hybrid vehicles is recognised as an effective solution to reduce emissions and fuel consumption in the short to medium term. The aim of this study was to evaluate methods to maximise the braking energy recovery capability of the 48V hybrid electric vehicle over pre-selected drive cycles using appropriately sized electrified components. The strategy adopted was based upon optimising the battery chemistry type via specific power capability, so that overall brake power is equal to the maximum battery charging power in a typical medium-sized passenger car under typical driving. This will maximise the regenerative braking energy whilst providing a larger torque assistance for a lower battery capacity. Dynamic simulation models were developed using GT-DRIVE software, emulating a mid-sized car with a 48V battery, and different turbocharged gasoline engines with motor-generator unit positions along a drivetrain. The 1.3 kWh battery pack was developed using a 14 Ah Lithium Iron Phosphate cell arranged in a 14 series 2 parallel configuration. A fuel economy comparison was produced using the FTP, WLTP, and HEFET drive cycles. When the motor-generator unit was attached via a synchronous belt, a 10-17% fuel saving was achieved in the WLTP drive cycle. Comparatively, when placing the electric machine after the clutch in a “P2” position, a 17-21% fuel saving was attained. The energy loss analysis of both P2 and P0 configurations revealed up to 7% overall reduction in total energy losses for the P2 setup. This was despite an increase in the motor-generator unit and battery losses due to the extended use of both in the electric-only mode capability with the P2 layout.
CitationAlnamasi, K., Terry, S., La Rocca, A., and Cairns, A., "Brake Power Availability Led Optimisation of P0 versus P2 48V Hybrid Powertrain Architectures," SAE Technical Paper 2020-01-0439, 2020.
Data Sets - Support Documents
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- Hook, M. and Tang, X. , “Depletion of Fossil Fuels and Anthropogenic Climate Change-A review,” Energy Policy 52:797-809, 2013.
- BP , “BP 2018 Energy Outlook,” https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/ pdfs/energy-economics/energy-outlook/bp-energy-outlook-2018.pdf, accessed Aug. 2019.
- Doerr, M., and Sapsford, S. , “Driving automotive electrification,” Ricardo, White Paper 2017.
- Jorhnson Matthey Battery Systems , http://www.jmbatterysystems.com/JMBS/media/JMBS/Documents/JMBS-28025-Battery-Guide-Reprint-July-2017.pdf, Accessed March 2019.
- Greenwood, D. , “Automotive Batteries 101,” in Panel Presentation at The Advanced Propulsion Center UK, July 3-4, 2018.
- Green Car Congress ,”Final Testing Confirms ADEPT 48V Diesel Hybrid Reduces Fuel Consumption 10-12% at Low Incremental Cost,” https://www.greencarcongress.com/2016/09/20160913-adept.html accessed March 2019.
- MAHLE Powertrain ,” MAHLE Powertrain High Charge Rate 48 V Battery Pack,” https://www.mahle-powertrain.com/media/mahle-powertrain/experience/48v-battery-pack/48v-battery_screen-all-sites.pdf, accessed October 2019.
- Auto Snout “Modern, Classic, Performance Cars 0-60 mph List,” https://www.autosnout.com/Cars-0-60mph-List.php, accessed March 2019.
- Dinger, A. et al. , “Batteries for Electric Cars: Challenges, Opportunities, and the Outlook to 2020,” The Boston Consulting Group, 7, 2010.
- Arbizzani, C., De Giorgio, F., and Mastragostino, M. , “4 - Battery Parameters for Hybrid Electric Vehicles,” in Advances in Battery Technologies for Electric Vehicles, 2015, 55-72, doi: 10.1016/B978-1-78242-377-5.00004-2.
- National Research Council , Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles (Washington, DC: The National Academies Press, 2015), 4-21, doi:10.17226/21744.
- Safoutin, M., Cherry, J., McDonald, J., and Lee, S. , “Effect of Current and SOC on Round-Trip Energy Efficiency of a Lithium-Iron Phosphate (LiFePO4) Battery Pack,” SAE Technical Paper 2015-01-1186, 2015, https://doi.org/10.4271/2015-01-1186.
- Ford , “EcoBoost,” https://www.ford.com/powertrains/ecoboost, accessed Oct. 2019.
- Bao, R., Avila, V., and Baxter, J. , “Effect of 48 V Mild Hybrid System Layout on Powertrain System Efficiency and Its Potential of Fuel Economy Improvement,” SAE Technical Paper 2017-01-1175, 2017, https://doi.org/10.4271/2017-01-1175.
- Burress, T. , “Benchmarking of Competitive Technologies,” Oak Ridge National Laboratory Presentation, May 14, 2012.
- GT-SUITE User Manual (Version 9.1), 2019.
- Lee, S., Cherry, J., Safoutin, M., McDonald, J. et al. , “Modeling and Validation of 48V Mild Hybrid Lithium-Ion Battery Pack,” SAE Int. J. Alt. Power. 7(3):273-287, 2018, https://doi.org/10.4271/2018-01-0433.
- Dagci, O., Pereira, N., and Cherry, J. , “Maneuver-Based Battery-in-the-Loop Testing - Bringing Reality to Lab,” SAE Int. J. Alt. Power. 2(1):7-17, 2013, https://doi.org/10.4271/2013-01-0157.