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

Shima Nazari, Jason Siegel, Robert Middleton and Anna Stefanopoulou
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Shima Nazari: Department of Mechanical Engineering, Universiy of California Davis, Davis, CA 95616, USA
Jason Siegel: Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Robert Middleton: Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Anna Stefanopoulou: Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA

Energies, 2020, vol. 13, issue 24, 1-17

Abstract: 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.

Keywords: energy management; hybrid electric vehicle; powertrain electrification; equivalent consumption minimization; supercharging; hardware-in-the-loop experiments (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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