This paper presents a novel concept, the Hybrid Power Pack (HPP), which consists of a hybridization\udkit for transforming small city cars, powered by an original diesel engine, into a parallel hybrid\udvehicle. The study was jointly conducted by the University of Rome “Sapienza” and the Enea\udCasaccia research center. The idea is to design a hybrid powertrain that can be installed in a typical\udmicrocar, which means that all systems and components will be influenced by the limited space\udavailable in the motor compartment of the vehicle. In this paper the details of the mechanical and\udelectrical realization of the powertrain will be discussed and the simulation of a small city car\udequipped with HPP will be presented and the results discussed and analyzed. The hybrid system\udalso includes the battery pack which is composed of twenty-four Li-ion cells made by EIG, connected\udin series. The storage system is controlled as regards the voltage and temperature by a\udBattery Management System (BMS). All the above components are connected and managed by a\udcontrol unit. The HPP presented in this paper obtains a reduction in fuel consumption higher than\ud20%. The solution presented with the HPP with its management strategy and the addition of the\ud“plug-in function” makes the hybrid vehicle suitable in terms of performance and consumption in\udevery driving conditions. The ideal strategy behind the “plug-in function” could represent a guideline\udfor further achievements and experimentations, because it offers a simple hardware layout\udand a real reduction in fuel consumption.
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