A Study On Control Strategy Of Electronic-hydraulic-compound Regenerative Braking For Electric Vehicle Based On ADVISOR

Because of the rapid growth of car ownership all over the world, the traditional internal combustion engine car is becoming more and more serious harm to human environment. More calls to protect the environment and the increasing shortage of petroleum reserves, all force people to reconsider the question of the motive forces of the future.Governments and automobile enterprises generally believe that energy conservation and emission reduction are the main directions of the future automobile technology development, and development of the electric car is the best way to solve the two technical difficulties. The obvious shortcoming of pure electric vehicles is the limit of driving distance. Although the motor technology is perfect, travel distance and the price of battery are also the major obstacles to promote the electric car. Pure electric vehicles can recycle part of braking energy because of the regenerative braking, and can improve the efficiency of energy utilization, also increase travel distance. The braking energy recovery is the important development direction of pure electric vehicles.This thesis use the front-wheel drive of EVs as the research target, by navigating the contents of regenerative braking control strategy which in other words is using braking and hydraulic motor compound braking control strategy to serve the purpose of improving the braking energy recovery efficiency. At first, according to the working condition of the brake(braking intentions) under the functional requirements, the thesis analyzes the force braking process and proposes the braking force distribution method, combining with ECE braking regulation and considering the motor brake and hydraulic brake larger dynamic characteristic differences between motor regenerative braking control strategy. By analyzing many influential factors of recycling braking energy and the four major electric vehicle regenerative braking control strategies which has been proposed, and considering the limits of speed and battery state of charge(SOC), Along with the braking intensity adjustment,this paper brings up control strategy of the electronic-hydraulic-compound regenerative braking system.By using the MATLAB/Simulink Modeling and simulation software for the hybrid control strategy proposed, the thesis establishes the rear brake before the braking force distribution model, the mechanism of electric power model and the model of integrated control strategy, and then use ADVISOR module related simulation analysis. In order to validate the effectiveness and feasibility of the proposed electronic-hydraulic-compound braking control strategy, this paper select CYC-NYCC and UDDS driving cycles to build up the simulation model of hybrid control strategy and compares with the original regenerative braking control strategy simulation.