The aim of this paper is to propose a generic approach to the development of supervisory control strategies for hybrid-electric drivetrains. A general formulation of the instantaneous power split between an IC engine and an electric machine in a charge-sustaining, parellel hybrid drivetrain is given. First, a heuristic formulation is used to convert the electrical power flow into equivalent fuel cost based on the average 'cost' of electricity through the various power paths. On that basis, the determination of the optimal power split between the two machines at each instant of time (i.e. at a given speed) can be determined by a simple minimization of a univariate form. The global state of charge (SC) constraint is achieved by biasing the optimal power split depending on the difference between the equivalent state of charge (including recoverable kinetic energy) and the desired SOC target range by means of a penalty function. Then, a general, scalable representation of the efficiency maps of both IC engine and EM machine is presented. Through appropriate non-dimensionalization and parametrization, these efficiency characteristics can be represented by affine relationships, with coefficients only depending (non-linearly) on the powertrain speed.
A hardware- and architecture-independent supervisory control strategy for hybrid-electric drivetrains
Eine generische, Hardware- und Architektur-unabhängige Regelstrategie für hybridelektrische Antriebe
2001
15 Seiten, 7 Bilder, 7 Quellen
Conference paper
English
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