Research On Regenerative Braking Control Strategy In Hybrid Electric Vehicle Based On Compound-Structure Permanent-Magnet Motor

With the continuous increase of car ownership,the problems of exhaust emissions and energy shortages have gradually become prominent,and new energy vehicles have become the mainstream of the development of today’s automotive industry.Looking at the current new energy vehicle market,the development of hybrid vehicle technology is relatively mature,and the fuel economy is better than that of traditional fuel vehicles.However,the problem of emission pollution has also been improved due to the dependence on battery technology.Therefore,hybrid vehicles are the most suitable type for current development.Since hybrid vehicles need to work in coordination with the engine and motor to ensure the vehicle’s power,economy,comfort,safety.The compound-structure permanent-magnet motor can well meet these requirements and is applied to hybrid vehicles.Optimal distribution of power,reasonable optimization of the entire vehicle structure,flexible conversion of mechanical energy and electrical energy,and improvement of the working state of the vehicle.It is foreseeable that hybrid vehicles based on compound-structure permanent-magnet motor will have very broad development prospects.This paper takes Hybrid Electric Vehicle Based on Compound-Structure PermanentMagnet Motor(CSPM＿HEV)as the research object,analyzes the topology and working principle of CSPM＿HEV,and proposes regenerative braking for CSPM＿HEV Model,research on hybrid degree optimization selection,regenerative braking control strategy,regenerative braking and anti-lock braking coordinated control.Build a regenerative braking test bench,and provide new ideas and strategies for energy management strategies of hybrid electric vehicles.First of all,electromagnetic simulation is performed on the compound-structure permanent-magnet motor,the advantages and rationality of the compound-structure permanent-magnet motor are analyzed,and the CSPM＿HEV topology,working principle,dynamic relationship between components and energy flow relationship are studied.According to different braking requirements and working conditions,different braking modes are proposed to increase the proportion of regenerative braking in the braking process and recover more braking energy.Next,use Toyota Prius main component parameters for parameter matching,propose power,economy,and emission indicators,and determine the peak power,peak torque,and blending boundary value ranges of the vehicle through analysis and calculation.Based on CSPM＿HEV,a simulation model is built in CRUISE software to simulate and analyze vehicles with different hybrid degrees respectively,and the simulation results of different hybrid degrees and acceleration time per 100 kilometers,equivalent fuel consumption rate,CO emissions,and maximum vehicle speed are obtained.The particle swarm optimization algorithm is used to optimize the degree of mixing with multiple parameters as the objective function,determine the final degree of mixing,determine whether the proposed performance indicators are met according to the results,and finally determine the power and torque parameters of the engine and motor,which provide a basis for subsequent research.Then,using CSPM＿HEV as the research object,analyze the force of the vehicle during braking,study the relationship between braking intensity and braking force distribution that meets the requirements of ECE braking regulations,and propose the performance of regenerative braking energy recovery in different braking modes Evaluation index.A regenerative braking energy recovery control strategy based on fuzzy control is proposed,a CRUISE-MATLAB software co-simulation platform is built,and a vehicle control strategy model is established in MATLAB/Simulink.The parallel regenerative braking energy recovery control strategy and the regenerative braking energy recovery control strategy based on fuzzy control are used to simulate CSPM＿HEV under three cycle conditions of NEDC,WLTC and FTP75.The results of SOC change,braking energy recovery,and regenerative braking energy recovery efficiency are compared and analyzed to verify the superiority of the proposed control strategy.Subsequently,considering the CSPM＿HEV under emergency braking conditions,a coordinated control strategy of the regenerative braking system and ABS is proposed.Using the proposed coordinated control strategy and ordinary ABS strategy,the emergency braking is simulated at the initial speed of 60km/h and 100km/h,and the braking distance,braking time,and braking response time are simulated.Comparative analysis to verify the effectiveness and safety of the proposed control strategy.Finally,a regenerative braking test bench is built based on the split CSPM,and the braking conditions of the vehicle are tested and studied under different braking modes to verify the feasibility of the proposed braking mode.