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Energies 2017, 10(7), 975; https://doi.org/10.3390/en10070975

Multi-Objective Optimization Considering Battery Degradation for a Multi-Mode Power-Split Electric Vehicle

National Engineering Laboratory for Automotive Electronic Control Technology, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai 200240, China
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Received: 8 June 2017 / Revised: 1 July 2017 / Accepted: 9 July 2017 / Published: 11 July 2017
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Abstract

A multi-mode power-split (MMPS) hybrid electric vehicle (HEV) has two planetary gearsets and clutches/grounds which results in several operation modes with enhanced electric drive capability and better fuel economy. Basically, the battery storage system is involved in different operation modes to satisfy the power demand and minimize the fuel consumption, whereas the complicated operation modes with frequent charging/discharging will absolutely influence the battery life because of degradation. In this paper, firstly, we introduce the solid electrolyte interface (SEI) film growth model based on the previous study of the battery degradation principles and was verified according to the test data. We consider both the fuel economy and battery degradation as a multi-objective problem for MMPS HEV by normalization with a weighting factor. An instantaneous optimization is implemented based on the equivalent fuel consumption concept. Then the control strategy is implemented on a simulation framework integrating the MMPS powertrain model and the SEI film growth map model over some typical driving cycles, such as New European Driving Cycle (NEDC) and Urban Dynamometer Driving Schedule (UDDS). Finally, the result demonstrates that these two objectives are conflicting and the trade-off reduces the battery degradation with fuel sacrifice. Additionally, the analysis reveals how the mode selection will reflect the battery degradation. View Full-Text
Keywords: multi-objective optimization; power-split hybrid; battery degradation; solid electrolyte interface (SEI) film model multi-objective optimization; power-split hybrid; battery degradation; solid electrolyte interface (SEI) film model
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Ma, X.; Zhang, Y.; Yin, C.; Yuan, S. Multi-Objective Optimization Considering Battery Degradation for a Multi-Mode Power-Split Electric Vehicle. Energies 2017, 10, 975.

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