Fuel efficiency optimization methodologies for series hybrid electric vehicles

Chen, Boli, Evangelou, Simos A. and Lot, Roberto (2019) Fuel efficiency optimization methodologies for series hybrid electric vehicles. In 2018 IEEE Vehicle Power and Propulsion Conference (VPPC). IEEE. 6 pp . (doi:10.1109/VPPC.2018.8604991).

Record type: Conference or Workshop Item (Paper)

Abstract

This paper provides an overview of various optimization formulations that can lead to improved fuel economy for a series hybrid electric vehicle (HEV). The relevance and improvement to the current state-of-the-art are discussed. The formulated optimal control problems (OCP) consist of two individual optimization challenges: vehicle speed optimization and powertrain power-split optimization. These OCPs can be merged leading to a practical and global problem, where all the aspects are optimized simultaneously for a prescribed route and traveling time. Alternatively, the global problem can be approximated by solving individual OCPs, one for each aspect, in steps and combined a posteriori. The optimal solutions in each case are investigated and compared by simulation examples to expose the trade-off between optimality of fuel economy achieved by global optimization and reduction in computational complexity and hence practicality of the two-step solution approximation.

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