Performance test to determine electric vehicle driving range

Abstract

A new method to estimate the driving range in electric vehicles has been developed. The new method is based on full electric energy supply from a unique lithium-ion battery that equips the electric vehicle. The simulation method includes engine consumption as well as auxiliary systems and accessories that are currently powered by a servicing lead-acid battery. The modeling uses an AC/DC double electric circuit to represent the AC electric engine and the DC auxiliary systems and accessories. Modeling has been applied to the most current driving modes, normal run at constant speed, acceleration and deceleration mode, and ascending and descending road. Power consumption simulation has been obtained for a standard electric vehicle model and given driving conditions, but can be applied to any model and variable driving conditions only changing characteristics parameters of the study like vehicle mass, size and shape, wind speed, type and tilt of the road. Driving time has been taken as the average from different daily trips in urban routes for modern cities. Experimental tests have been carried out to validate theoretical predictions for different driving conditions and different use of auxiliary systems and accessories. The results from experimental tests have matched theoretical prediction within high accuracy, more than 98%. The method provides a useful tool for car manufacturers to evaluate the driving range with precision in real conditions for electric vehicles that are equipped with a single power battery