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Analysis and Design of an Optimal Energy Management and Control System for Hybrid Electric Vehicles

This paper presents a preliminary design and analysis of an optimal energy management and control system for a parallel hybrid electric vehicle using hybrid dynamic control system theory and design tools. The vehicle longitudinal dynamics is analyzed. The practical operation modes of the hybrid electric vehicle are introduced with regard to the given power train configuration. In order to synthesize the vehicle continuous dynamics and the discrete transition between the vehicle operation modes, the hybrid dynamical system theory is applied to reformulate such a complex dynamical system in which the interaction of discrete and continuous dynamics are involved. A dynamic programming-based method is developed to determine the optimal power split between both sources of energy. Computer simulation results are presented and demonstrate the effectiveness of the proposed design and applicability and practicality of the design in real-time implementation. Copyright 2002 EVS19