Performance Simulation Of Brakeing Energy Recovery By Flywheel Device With Electromagnetic Coupling Transmission

Under the pressure of energy saving and environmental protection,improving energy utilization rate has become one of the research issues attracting attention.As a way of energy saving and environmental protection for electric vehicles,brake energy recovery technology,can improve the energy utilization rate and extend the driving range of the vehicle.Therefore,it is worth discussing how to improve the braking energy recovery efficiency of electric vehicles by using reasonable methods.In this paper,it presents the design scheme of the flywheel braking energy recovery device which is composed of energy storage flywheel,electromagnetic coupling transmission mechanism and electrical control device.After elaborating the structural design method of energy storage flywheel and the selection requirements of flywheel materials,a multi-stage flywheel energy storage device is designed and its chassis layout scheme is designed.This paper expounds the structure and basic working principle of electromagnetic slip clutch and analyses the influence of excitation current output by electrical control device on the mechanical characteristics of electromagnetic slip clutch.It is concluded that the DC speed regulating system consisting of thyristor phase controlled rectifier is the essence of this system.The output speed of electromagnetic slip clutch is controlled by double closed-loop speed regulation method.The speed regulation process and static characteristics of double closed-loop control system are analyzed.The current loop controller and the speed loop controller of the double closed-loop speed regulation method adopt the proportional integral controller.The power electronic converter is designed as the first-order inertial loop.The double closed-loop control model is established and simulated.On the basis of analyzing the braking state of automobile under the action of flywheel braking energy recovery device of electromagnetic coupling transmission,this paper designs flywheel energy storage model,hydraulic braking model and ABS control model with self-optimizing control method.The braking force distribution of front and rear wheels is designed with fixed proportion and the combination strategy of flywheel brake energy recovery device brake and hydraulic brake in series is adopted.The braking strategy in series is established,and the braking model of the whole vehicle is established and simulated.The multi-stage flywheel energy storage box is designed and manufactured.The inertia flywheel is used to simulate the moment of inertia of a vehicle while driving.The simulation test platform for the flywheel braking energy recovery system with electromagnetic coupling transmission is built and the braking conditions of different initial braking speeds are simulated.The simulation results show that the output speed of the electromagnetic slip clutch can be controlled rapidly and stably by using the double closed-loop speed control method and the braking energy recovery rate of the flywheel braking energy recovery device of the electromagnetic coupling transmission is more than 24%at any initial braking speeds.The moment of inertia of the flywheel and the electromagnetic transmission torque have an impact on the braking energy recovery status.The test results show that the energy recovery rate of the simulation test platform is more than 30%,and the braking energy recovery condition can be changed by adjusting the electromagnetic slip clutch transmission ratio.