The powertrain of a hybrid electric vehicle (HEV) can be operated in either a power-boosting or an energy-saving mode. The first mode is used for responding to the driver's full-load demand and the second for achieving high fuel efficiency given an increased number of degrees of freedom in energy management. Optimization problems for the two operation modes are formulated, and the design spaces are analysed for general power-split architectures. In the output torque maximization problem for the input-split HEV powertrain, the original three-variable problem with 14 inequality constraints was reduced to a one-variable problem with two inequality constraints after applying dominance and monotonicity analysis. Then, the multi-objective energy consumption minimization problem was investigated to show how the feasible operation space is defined and how it will appear in the three-dimensional (3D) design space of the first problem. It was also shown how the respective objectives vary in the feasible domain, and the Pareto frontier in the objective space was presented for the compound-split case. Optimization results are further presented and analysed for input-split and compound-split architectures. The analysis leads to the definition of a new concept of HEV optimal operation that improves the conventional idea of engine optimal operation line. The line is dependent on the vehicle output load condition and consists of Pareto-optimal operation options for all feasible battery powers.
Engine optimal operation lines for power-split hybrid electric vehicles
Optimierte Motorbetriebsweisen für Elektro-Hybridfahrzeuge mit Leistungsaufteilung
2009
14 Seiten, 16 Bilder, 25 Quellen
Article (Journal)
English
Engine optimal operation lines for power-split hybrid electric vehicles
SAGE Publications | 2009
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