Parameter Matching And Simulation Analysis Of Optimization Of Power System Of Pure Electric Bus

Since the beginning of the new century,problems such as the increasing shortage of traditional energy sources and the destruction of the ecological environment have become more and more serious.Energy conservation environmental protection and sustainable development have become the goals actively pursued by countries.As a large consumer of energy,vehicles have been criticized for its damage to the ecological environment.Therefore,pure electric vehicles have become one of the ideal models to replace traditional vehicles to alleviate the global energy and ecological crisis,and are currently the focus of development in countries around the world.Limited by the development of battery and motor technology,pure electric vehicles currently have problems with driving range and energy consumption,which need to be worked hard to solve in the future.The research in this paper is based on a pure electric bus from a bus factory.By matching design and calculation of the power system,the vehicle’s dynamic performance and economic performance are optimized.Introduction and selection of pure electric bus power system.First introduced the structure and working principle of the power system of pure electric vehicles,then compared the comprehensive performance of the more common drive motors and power batteries on the market,combined with the design requirements,the permanent magnet synchronous drive motor and lithium iron phosphate were finally selected.Finally,four types of power system layouts are introduced,and the advantages and disadvantages of the four layouts are analyzed.Finally,the motor shaft and the drive shaft are perpendicular to each other were selected.The vehicle dynamic model is established and the parameters of the power system are matched.First,perform a force analysis on the entire vehicle to establish a dynamic model of the vehicle;then,list the design goals and vehicle parameters,and mathematically calculate the rated power,peak power,rated speed,maximum speed,The rated torque,the maximum torque,and the rated voltage,rated capacity of the power battery,the number of battery cells,and the main reduction speed ratio are used to calculate parameters to determine the main parameter values of the power system.Construction of vehicle performance simulation model and introduction of braking energy recovery strategy.The vehicle performance simulation is based on AVL Cruise and Matlab / Simulink software.The vehicle simulation model is built in Cruise software.The vehicle and the initial matching power system parameter values are inputted.The braking energy recovery model is built in Matlab / Simulink software.Verifying the rationality of the initial matching power system parameters through joint simulation.Optimal design of power system parameters based on Taguchi’s robust optimization method.The theory and process of Taguchi’s robust optimization method are introduced in detail,a set of orthogonal test schemes are proposed,and the simulation results of the test schemes are obtained using Cruise software.The simulation results are analyzed and processed to predict the optimal solution of the dynamic system parameters and input to simulate in Cruise.By comparing the simulation results before and after the optimization,it can be known that the economic improvement after the optimization is obvious.The continuous driving mileage and comprehensive energy consumption of the NEDC mode are increased by 9.81% and 13.25%,respectively,and the cruise speed of 40 km / h is increased by 10.71%.