Optimal energy management of a mild-hybrid vehicle

Abstract : The paper presents the development of a supervisory controller for a mild-hybrid vehicle, a hybrid natural gas SMART, equipped with a starter alternator and supercapacitor manufactured by Valeo. This electric additional power can be used to stop and start quickly the engine and also to power the vehicle alongside with the engine. The electric motor can also be used to recharge the supercapacitor. After a description of the models developed for the electric motor dynamics, a dynamic programming algorithm is applied for the optimization of power split, based on these models. The resulting optimal power split is compared to a real-time control law. Among the available control laws, the choice of the Equivalent Consumption Minimization Strategy (ECMS) allows to keep the same models that have been used for dynamic programming algorithm. Moreover, some road tests show the resulting behavior of the powertrain, in terms of supercapacitor voltage, motor and engine torque and speed.
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Grégory Rousseau, Antonio Sciarretta, Delphine Sinoquet. Optimal energy management of a mild-hybrid vehicle. European Conference on Alternative Energies for the Automotive Industry, Apr 2008, Poitiers, France. ⟨hal-02284289⟩

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