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Energies 2017, 10(4), 412;

Optimal Energy Management Strategy for a Plug-in Hybrid Electric Vehicle Based on Road Grade Information

State Key Laboratory of Mechanical Transmissions & School of Automotive Engineering, Chongqing University, Chongqing 400044, China
Key Laboratory of Advanced Manufacture Technology for Automobile Parts, Ministry of Education, Chongqing University of Technology, Chongqing 400054, China
Department of Mechanical Engineering, University of Michigan-Dearborn, Dearborn, MI 48128, USA
Author to whom correspondence should be addressed.
Academic Editor: Hailong Li
Received: 9 January 2017 / Revised: 11 March 2017 / Accepted: 18 March 2017 / Published: 23 March 2017
(This article belongs to the Special Issue Advanced Energy Storage Technologies and Their Applications (AESA))
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Energy management strategies (EMSs) are critical for the improvement of fuel economy of plug-in hybrid electric vehicles (PHEVs). However, conventional EMSs hardly consider the influence of uphill terrain on the fuel economy and battery life, leaving vehicles with insufficient battery power for continuous uphill terrains. Hence, in this study, an optimal control strategy for a PHEV based on the road grade information is proposed. The target state of charge (SOC) is estimated based on the road grade information as well as the predicted driving cycle on uphill road obtained from the GPS/GIS system. Furthermore, the trajectory of the SOC is preplanned to ensure sufficient electricity for the uphill terrain in the charge depleting (CD) and charge sustaining (CS) modes. The genetic algorithm is applied to optimize the parameters of the control strategy to maintain the SOC of battery in the CD mode. The pre-charge mode is designed to charge the battery in the CS mode from a reasonable distance before the uphill terrain. Finally, the simulation model of the powertrain system for the PHEV is established using MATLAB/Simulink platform. The results show that the proposed control strategy based on road-grade information helps successfully achieve better fuel economy and longer battery life. View Full-Text
Keywords: plug-in hybrid electric vehicles; energy management strategy; road grade; state of charge plug-in hybrid electric vehicles; energy management strategy; road grade; state of charge

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Liu, Y.; Li, J.; Ye, M.; Qin, D.; Zhang, Y.; Lei, Z. Optimal Energy Management Strategy for a Plug-in Hybrid Electric Vehicle Based on Road Grade Information. Energies 2017, 10, 412.

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