A Combined Estimation Method for Energy Management System of Solar Electric Vehicles

Cong Binh Tran, Manh Dung Ngo

Southeast-Asian J. of Sciences

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This paper describes a proposed energy management system for solar electric vehicles (SEVs) using lead-acid battery. In an internal combustion engine vehicle, a fuel gauge is an important part for displaying the remaining fuel in the fuel tank of vehicle. It helps predict the remaining energy available to the vehicle and how far the vehicle can travel before running out of energy. For SEVs, energy is supplied by a battery bank and a photovoltaic (PV) array. Therefore, available energy status of the vehicle is determinedfrom the state of charge (SOC) of the battery and theinstantaneous available energy from the PV.The energy management system (EMS) measures the SOC of the battery, PV power, and power consumption of the electrical load (mainly the electrical motor)under specific mechanical load and speed of the vehicle. For a givenoperating condition, the EMS estimates and displays remaining run-time and driving range. This information may be used to adjust driving strategy in order to extendthe available driving distancewhile providing more energy from the PV array. The EMS continuously estimates and updates the dashboard to provide the newly estimated remaining driving distance when the driver adjusts the vehicle speed. Experimental tests and results are presented to validate the proposed EMS for solar electric cars.

Keywords—solar electric vehicles; energy management system (EMS); lead-acid battery; state of charge (SOC); driving range