Matching And Simulation Of Powertrain System For Pure Electric Vehicle

The energy crisis and environmental pollution produced by the increasing number of automobile are getting worse over time. As an effective way to solve these issues, electric vehicle draws arouse wide concern from governments and automotive companies. After the investment of our country and enterprises, a lot of progresses had been made in the research of electric vehicle in the last few years. However, there are a lot of problems remaining to be solved in this field, such as motor control and batteries. In this situation, a reasonable matching for the powertrain system of an electric vehicle has become an effective way to improve the performance of an electric vehicle. A pure electric vehicle which is modified from a gasoline automobile is designed in this paper.Design of the dynamic indicators and cruising range. The dynamic indicators and cruising range of the vehicle are designed according to its function, customers and market. This electric vehicle is mainly designed for express delivery and goods distribution for online trading. Customers such as express companies and logistics industry may be the main consumers for this vehicle. The market we would like to sell this vehicle were cities that encourage the use of electric vehicles such as chongqing and shanghai. Acceleration time, maximum velocity, climbing performance and cruising range are determined according to the characters above.Matching of the motor and battery. A matching for the motor and battery of the vehicle was carried out on the basis of dynamic indicators. Maximum power, nominal power, maximum speed and nominal speed of the motor are worked out. The capacity of the battery is calculated through the cruising range of the vehicle. Based on the comparison of different kinds of motors and batteries on sale, appropriate motor and battery for the vehicle is selected.Simulation of the vehicle’s dynamic performance. In order to examine the reasonability of the matching we have done above, a simulation test is carried out via AVL-cruise and a simulation model of this electric vehicle is built in the paper. Dynamic performance and electrical economy of the vehicle are calculated. The simulation results of maximum velocity, climbing performance and acceleration time suggest that the matching of the powertrain system meet the requirements of the dynamic indicators and the matching approach adopted in this paper is feasible. Then, the energy consumption in relative with velocity and driving cycles is calculated on the basis of the simulation model. Effects of velocity and driving cycles on energy consumption are discussed.Layout design of powertrain system and energy consumption test. Based on the matching results above and the gasoline automobile, a layout design is carried out in this paper. The location of the motor, battery pack and other auxiliary system is located and a dimension check is done by CATIA. Finally, a prototype is manufactured in this paper and an experiment on energy consumption is carried out according to the electric vehicle’s energy consumption and range test procedure of our country. The test result shows that the cruising range of the vehicle meet the design requirement. The accuracy of the model was proved by the comparison of the test and simulation result.