Research On Power System Simulation And Brake Energy Feedback Control Strategy For Pure Electric Bus

Problems such as energy crisis,air pollution,and frequent bad weather have become increasingly serious.They have put forward higher energy-saving and emission-reduction standards for the traditional automotive industry.Countries have also launched a timetable for the ban of traditional fuel vehicles and actively promote the development of new energy vehicles.Pure electric vehicles have attracted wide attention from the business community and academia due to their characteristics of greater energy conservation and environmental protection and their ease of industrialization.The source of pure electric vehicle power energy comes from the power battery,which drives the motor to deliver power to wheels to drive the vehicle.In the face of the short driving range of pure electric vehicles and the large weight of power batteries,it is a key research direction to improve the dynamic and economical performance of pure electric vehicles.This paper analyzes the structure of the pure electric vehicle power system,and compares the advantages and disadvantages of different types of drive motors and power batteries,providing a basis for the selection of drive motors and power batteries.According to the design target requirements,the vehicle dynamics calculation is performed to select and match each power component.A bench test was conducted on the motor to obtain the motor characteristic curve and the efficiency curve.The HPPC test was performed on the power battery to complete the test of the internal resistance of the battery.On the basis of analyzing the mathematical model of each power component,CRUISE software was used to model and simulate the vehicle,and calculation tasks such as acceleration,climbing,and constant driving range were designed,and the resulting dynamic and economical simulations were obtained.The results meet the vehicle design requirements.The unique braking energy feedback work mode of pure electric vehicles is very helpful to improve the power and economy of pure electric vehicles.When the vehicle is decelerating or braking.In this paper,the braking energy feedback control strategy based on fuzzy control theory is designed.By using CRUISE software and MATLAB/Simulink software,the model is established and the appropriate braking conditions are established,and compared the traditional braking strategy with the braking strategy used in this article The simulation results verify the feasibility of the control strategy.