Most energy management systems for hybrid electric vehicles still use rule-based energy management systems that rely on information stored in lookup tables, to define the current mode of operation and set-points under given circumstances. Because of the high number of parameters, the calibration of such energy-managements can be a cumbersome task. Mathematical methods are therefore inalienable to the calibration process. In this paper, it is demonstrated, how the theory of Hybrid Optimal Control can be used to calculate an initial parameter set for the energy management. As a first step, a Hybrid Optimal Control Problem is solved, to determine the controls for the optimal operation of the vehicle over a given cycle. The results can then be used to automatically calculate lookup-tables for optimal gear shifts, optimal torque-split between motor/generator and internal combustion engine and the determination of the drive mode (electric or hybrid mode).
Solving a hybrid optimal control problem including gear changes and different drive modes
2013
13 Seiten, 8 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
Solving a hybrid optimal control problem including gear changes and different drive modes
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