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Energies 2015, 8(11), 12458-12473; doi:10.3390/en81112325

Power Management Strategy of Hybrid Electric Vehicles Based on Quadratic Performance Index

School of Electrical Engineering and Automation, Tianjin University, No. 92 Weijin Road, Tianjin 300072, China
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Author to whom correspondence should be addressed.
Academic Editor: K.T. Chau
Received: 27 July 2015 / Revised: 20 October 2015 / Accepted: 22 October 2015 / Published: 4 November 2015
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Abstract

An energy management strategy (EMS) considering both optimality and real-time performance has become a challenge for the development of hybrid electric vehicles (HEVs) in recent years. Previous EMSes based on the optimal control theory minimize the fuel consumption, but cannot be directly implemented in real-time because of the requirement for a prior knowledge of the entire driving cycle. This paper presents an innovative design concept and method to obtain a power management strategy for HEVs, which is independent of future driving conditions. A quadratic performance index is designed to ensure the vehicle drivability, maintain the battery energy sustainability and average and smooth the engine power and motor power to indirectly reduce fuel consumption. To further improve the fuel economy, two rules are adopted to avoid the inefficient engine operation by switching control modes between the electric and hybrid modes according to the required driving power. The derived power of the engine and motor are related to current vehicle velocity and battery residual energy, as well as their desired values. The simulation results over different driving cycles in Advanced Vehicle Simulator (ADVISOR) show that the proposed strategy can significantly improve the fuel economy, which is very close to the optimal strategy based on Pontryagin’s minimum principle. View Full-Text
Keywords: hybrid electric vehicle; linear quadratic optimal control; real-time control; energy management hybrid electric vehicle; linear quadratic optimal control; real-time control; energy management
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Xia, C.; Zhang, C. Power Management Strategy of Hybrid Electric Vehicles Based on Quadratic Performance Index. Energies 2015, 8, 12458-12473.

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