Research On Braking Energy Recovery Of Pure Electric Vehicle Based On Fuzzy Control

At present,automobile exhaust emissions are the main cause of environmental pollution,and with the global energy consumption,the energy crisis has become increasingly prominent.Therefore,it is urgent to find new energy sources to replace traditional energy sources.With its characteristics of zero emissions,abundant energy sources,and high efficiency,pure electric vehicles can alleviate the environmental pollution and energy crisis caused by fossil energy to a certain extent.However,due to the current technical bottleneck of pure electric vehicle power batteries,the energy density is not high,which limits the driving range of pure electric vehicles,which hinders the development of pure electric vehicles.The use of braking energy recovery technology can recover the kinetic energy of the vehicle during braking and store the recovered energy in the power battery,so that the energy can be recycled and the vehicle's energy utilization rate can be improved,which to a certain extent makes up for the shortcomings of pure electric vehicles.This article takes pure electric vehicles as the research object.First,the composition and principle of the braking energy recovery system are explained.The pure electric vehicles are matched with the power system parameters according to the vehicle parameters.The matching objects include the drive motor,power battery,and drive system.The matching results between the vehicle parameters and the power system parameters are used to build the model of each vehicle system.Analyze the driving and braking forces of pure electric vehicles,and study and compare three typical automobile braking force distribution control strategies.Analyze the implementation difficulty,braking stability,and braking energy recovery rate of the strategies.The ideal braking force distribution control strategy is used as the control strategy in this paper.Based on the three key factors affecting the braking energy recovery,based on the ideal braking force distribution curve and fuzzy logic control principle,a braking energy recovery control strategy for a front-drive pure electric vehicle was developed.The designed fuzzy controller takes braking strength z,vehicle speed v,and battery state of charge(SOC)as input variables,and regenerative braking force distribution coefficient k as output variables.Based on the analysis of each variable,a fuzzy Control rules.According to the designed fuzzy controller,based on the ideal braking force distribution control strategy,the braking energy recovery control strategy model of this paper is established in MATLAB / Simulink.The vehicle model established by AVL cruise is used to implement the vehicle model and control strategy.Co-simulation.The simulation analysis was performed using FTP75 cycle operating conditions.The simulation resultsshow that the developed braking energy recovery control strategy can significantly improve the braking energy recovery rate while ensuring the stability of the brake,which verifies the pure electric vehicle brakebuilt inthis paper.Effectiveness ofenergyrecovery control strategies.