Simulation Research Of Full Decoupling Regenerative Braking System

With the grim of the energy and environmental issues increasingly,the traditional automotive industry has been extremely limited,so the development of new energy automotive industry has been a major trend in the future of the automotive industry,and has been particularly urgent.Major domestic and foreign automobile enterprises have vigorously started studying the relevant technical areas,which the development of pure electric cars and hybrid vehicles is a very important part of the new energy automotive area.As the great advantage of the regenerative braking system in terms of energy conservation,it has become the focus of attention in the new energy automotive industry.Regenerative braking system is from the motor participation in the traditional braking system,and it has to both address problems about the allocation of braking force and the coordination of motor brake and hydraulic brake.Based on the state 863 project,this thesis developed a new type of full decoupling regenerative braking system,and the researches carried on are as follows:1.the structure and characteristics of the full decoupling regenerative braking system has been analyzed;comparing with the single axis decoupling and no decoupling system,the fUll decoupling has more energy saving in many aspects of energy recovery,brake feeling etc;Based on the hydraulic brake demand analysis,the structure framework of the full decoupling braking system has been designed,and various working state of the brake system is analyzed.2.the demand indicators of hydraulic brake system have been analyzed,and a hydraulic overall pedal simulator has been developed,calculated its parameters;High-pressure accumulator and hydraulic pump has been analyzed,calculated their parameters,and the linear valves about the structure,the forces and flow characteristics has been analyzed.3.the contrast of this thesis programs and ECB(Toyota Regenerative Braking System)program are analyzed,which indicate the advantages of the thesis program and the common function of the two programs,and the PRIUS vehicle ECB benchmarking has been constructed;the test of the brake pedal stroke simulator on the different pedal intensity is completed;the test of the high-pressure accumulator about pressure and hydraulic flow is completed,and the test of the hydraulic pump about the current response is completed,and the test of linear valves about hydraulic and electrical characteristics are completed;Based on the control strategies and test bench,the functional test of the system is completed.4.Based on the analysis of system components and the AMESim platform,the component models are built,and the result of the component models simulation has identified the rationality of the models;Based on the control strategy,the result of the system model simulation on the AMESim-Simulink platform has showed that it can achieve coordinated control about hydraulic brake and motor brake,identified the rationality of this scheme.Use Cruise-Simulink co-simulation platform,the result of vehicle model and control strategy simulation,comparing with the result data of the original program,validated that the fUll decoupling braking system has better energy-saving.