Research On Electronic-mechanical-compound Regenerative Braking For Electric Vehicles

The electric vehicles has been seen as an important transportation in the future with its high energy efficiency and low emissions.however,the driving distance of electric vehicles is hindered its commercialization.Regenerative braking has great significance to energy saving which can extended the driving range.This paper focuses on the research of electronic-mechanical-compound braking to maximize the regenerated energy.The distribution process on electronic-mechanical-compound braking force is clarified carefully,and the test was completed on the regenerative braking test platform further.The main contents of this paper include:The theory of regenerative braking control of BLDC is analyzed firstly,and based on the braking dynamic and braking regulation,a mathematical model on the range safe braking is established.The regenerative process of braking energy is derived further,and the main influencing factors of energy regenerative efficiency were obtained.In order to recover more regenerative energy in the range safe of braking,a fuzzy logic controller is designed.Based on braking dynamics,a model on the electronic-mechanical-compound braking force distribution of electric vehicles is established on the MATLAB/Simulink.The regenerative braking model of motor is also established,and the high energy recovery rate is obtained by simulation.According to the strategy of electronic-mechanical-compound regenerative braking,the functional requirement of regenerative braking test platform is analyzed,and then,the structure scheme of the test platform is determined.Based on the safety and economy of the regenerative braking test platform,the scaling test is applied to the test platform,and According to the principle of similarity,the similarity criterion of the relevant physical quantities is determined.At the same time,taking into account the compatibility and scalability of the test platform,the idea of modular design is adopted.The control scheme of the main modules for the test platform is designed,on the basis of LabVIEW,the brake voltage of motor and the excitation current of the magnetic powder brake are controlled.In the end,the simulation of electronic-mechanical-compound braking is realized by using the calibration method.The experiment results show that the electronic-mechanical-compound braking process of text platform can be simulated and the recyclable energy ratio is progressed,meet the functional requirements of electronic-mechanical-compound braking.It provides a practical and feasible method for electronic-mechanical-compound regenerative braking in electric vehicle.