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Article

Power Split Supercharging: A Mild Hybrid Approach to Boost Fuel Economy

1
Department of Mechanical Engineering, Universiy of California Davis, Davis, CA 95616, USA
2
Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in 2019 WCX World Congress Experience, Detroit, MI, USA, 9–11 April 2019; No. 2019-01-1207.
Energies 2020, 13(24), 6580; https://doi.org/10.3390/en13246580
Received: 17 November 2020 / Revised: 8 December 2020 / Accepted: 9 December 2020 / Published: 14 December 2020
This work investigates an innovative low-voltage (<60 V) hybrid device that enables engine boosting and downsizing in addition to mild hybrid functionalities such as regenerative braking, start-stop, and torque assist. A planetary gear set and a brake permit the power split supercharger (PSS) to share a 9 kW motor between supercharging the engine and direct torque supply to the crankshaft. In contrast, most e-boosting schemes use two separate motors for these two functionalities. This single motor structure restricts the PSS operation to only one of the supercharging or parallel hybrid modes; therefore, an optimized decision making strategy is necessary to select both the device mode and its power split ratio. An adaptive equivalent consumption minimization strategy (A-ECMS), which uses the battery state of charge (SoC) history to adjust the equivalence factor, is developed for energy management of the PSS. The A-ECMS effectiveness is compared against a dynamic programming (DP) solution with full drive cycle preview through hardware-in-the-loop experiments on an engine dynamometer testbed. The experiments show that the PSS with A-ECMS reduces vehicle fuel consumption by 18.4% over standard FTP75 cycle, compared to a baseline turbocharged engine, while global optimal DP solution decreases the fuel consumption by 22.8% compared to the baseline. View Full-Text
Keywords: energy management; hybrid electric vehicle; powertrain electrification; equivalent consumption minimization; supercharging; hardware-in-the-loop experiments energy management; hybrid electric vehicle; powertrain electrification; equivalent consumption minimization; supercharging; hardware-in-the-loop experiments
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MDPI and ACS Style

Nazari, S.; Siegel, J.; Middleton, R.; Stefanopoulou, A. Power Split Supercharging: A Mild Hybrid Approach to Boost Fuel Economy. Energies 2020, 13, 6580. https://doi.org/10.3390/en13246580

AMA Style

Nazari S, Siegel J, Middleton R, Stefanopoulou A. Power Split Supercharging: A Mild Hybrid Approach to Boost Fuel Economy. Energies. 2020; 13(24):6580. https://doi.org/10.3390/en13246580

Chicago/Turabian Style

Nazari, Shima, Jason Siegel, Robert Middleton, and Anna Stefanopoulou. 2020. "Power Split Supercharging: A Mild Hybrid Approach to Boost Fuel Economy" Energies 13, no. 24: 6580. https://doi.org/10.3390/en13246580

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