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

Energies

卷:13

Anna Stefanopoulou¹  Robert Middleton¹  Jason Siegel¹  Shima Nazari² 

[1] Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA;

[2] Department of Mechanical Engineering, Universiy of California Davis, Davis, CA 95616, USA;

关键词: energy management;    hybrid electric vehicle;    powertrain electrification;    equivalent consumption minimization;    supercharging;    hardware-in-the-loop experiments;   

DOI  :  10.3390/en13246580

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown