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- Title
Power Split Supercharging: A Mild Hybrid Approach to Boost Fuel Economy †.
- Authors
Nazari, Shima; Siegel, Jason; Middleton, Robert; Stefanopoulou, Anna
- 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.
- Subjects
REGENERATIVE braking; ENERGY management; ENERGY consumption; AUTOMOTIVE fuel consumption; DYNAMIC programming; DYNAMOMETER; PLANETARY gearing; FUEL
- Publication
Energies (19961073), 2020, Vol 13, Issue 24, p6580
- ISSN
1996-1073
- Publication type
Article
- DOI
10.3390/en13246580