Multi-Objective Supervisory Controller for Hybrid Electric Vehicles

In this article, we address the problem of energy management control design in hybrid electric vehicles (HEVs) to achieve minimum fuel consumption while optimally limiting battery degradation. We use Pontryagin’s minimum principle (PMP) to solve the optimal control problem. To the end of controlling battery aging to guarantee battery performances over 150,000 miles, a battery capacity loss reference trajectory is defined and a battery aging model is used by the optimizer. The resulting optimal supervisory control strategy is able to regulate both state of charge and capacity loss to their reference values. Simulation results conducted on a pre-transmission HEV show that the battery capacity loss can be regulated to achieve the long-term objective without sacrificing much fuel economy.

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