Method of compilation of the mathematical model and results of calculation of movement indicators of the re-equipped electromobile of category M1 in road test procedure

Abstract

The method of addition and results of calculation according to the mathematical model are offered in the article. The problem of mathematical description of the functional elements of electric wheeled vehicles (EWV) is complicated by the need to describe the electrical processes that occur and the influence of the control system on the power plant.

The developed method is original, the system "Power accumulator battery – Traction electric motor – Transmission" in the conditions of movement on a driving cycle is considered.

The OpenModelica mathematical package, an open modeling and modeling environment based on Modelica, was chosen to compile the mathematical model. The model has a "Driver" unit, which is a closed loop control controller. It monitors the actual speed of the electric car and compares it with the required, set driving cycle.

The traction-speed and energy indicators of the converted M1 vehicle into a battery electromobile are determined. With the help of the developed technique, it is possible to predict the performance of EWV before the conversion. As initial numerical values ​​of parameters of the re-equipped vehicle for carrying out numerical experiment with use of the personal computer, the common vehicle of the M1 ZAZ-965 "Zaporozhets" category was chosen. The method of conducting a numerical experiment involves a large number of calculations in different combinations of initial parameters. In the future, it provides for road and bench tests.

The technical level of re-equipment is determined by the specific weight and unit cost of both individual units and all electronic equipment as a whole. However, the cost of equipment is highly volatile, so it is difficult to assess it objectively. The paper proposes the criterion of the possibility of preserving the value of the total mass of the converted ECT, the condition of limitation in overall dimensions, the maximum angular velocity of the rotor of the traction motor, the maximum current and voltage in the power elements of the control system.

Key words: electromobile, re-equipment, efficiency, mathematical model, controller, numerical experiment, energy efficiency.