Modeling and Analysis Range Extender for Battery Electric Vehicles

The publication presents the results of analysis regarding the use of low-power diesel generating sets used to increase the range of electric vehicles. Diesel generating sets are a solution to basic shortcomings of electric vehicles, such as their short range, resulting from the limited capacity of batteries and their long charging time. They are mainly used for long-distance journeys between cities. The paper discusses the basic configurations of drive systems used in electric and hybrid vehicle and the basic configurations of drive systems using combustion generating sets for increasing the range of vehicles with electric drive are presented. On the basis of traction tests performed in real road conditions for an electric car assisted by two diesel generators (4 kW petrol, 5.5 kW diesel) installed on a light trailer, a mathematical model of the system was developed in the Modelica environment. The mathematical model developed takes into account the dynamic loads acting on the set of vehicles in motion along with the electric drive system supported by the diesel generator set. The results of simulation tests for selected route profiles and driving speed are presented. Research has been carried out on selected values of the state of charge SOCON-OFF (State Of Charge) of batteries, which cause a several percent impact on reduction of fuel consumption and the emission of harmful gases to the atmosphere by internal combustion engines.