Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 17 November 2020 / Approved: 18 November 2020 / Online: 18 November 2020 (11:16:31 CET)

How to cite: Nazari, S.; Siegel, J.; Middleton, R.; Stefanopoulou, A. Power Split Supercharging: A Mild Hybrid Approach to Boost Fuel Economy. Preprints 2020, 2020110471 (doi: 10.20944/preprints202011.0471.v1). Nazari, S.; Siegel, J.; Middleton, R.; Stefanopoulou, A. Power Split Supercharging: A Mild Hybrid Approach to Boost Fuel Economy. Preprints 2020, 2020110471 (doi: 10.20944/preprints202011.0471.v1).

Abstract

This work studies a novel low voltage (<60 V) hybrid system that supports engine boosting and downsizing in addition to start-stop, regenerative braking, and constrained torque assist/regeneration. The hybrid power split supercharger (PSS) shares a 9 kW motor between supercharging the engine or providing hybrid functionalities through a planetary gear set, a brake and a bypass valve. The PSS operation is limited to only one of the parallel hybrid or boosting modes at a time, necessitating a highly optimized decision making algorithm to select the device mode and power split ratio. In this work an adaptive equivalent consumption minimization strategy (A-ECMS) 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 a 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 baseline.

Subject Areas

Energy management; hybrid electric vehicle; powertrain electrification; equivalent consumption minimization; supercharging, hardware-in-the-loop experiments

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