Study On Design And Control Of Ball Screw Energy Regenerative Suspension

With the continuous development of automobile industry,the requirements for the performance of the automobile are becoming higher and higher.As an indispensible part of the automobile,the suspension attenuates the body vibration,so as to ensure the ride comfort and the handling stability of the vehicle.Traditional hydraulic shock absorbers will convert the vibration energy into internal energy of hydraulic oil and mechanical energy of related components.As energy conservation and emission reduction are advocated to promote the development of green recycling and low carbon in the world,how to recover and use the vibration energy of automobiles has become the focus of people's attention.Based on the project supported by the National Natural Science Foundation of China Youth Fund Project “Research on Adaptive Switching of Damping Control of Active Suspension Based on Road Intelligent Perception”(51605213),a new type of energy regenerative active suspension is proposed in this paper.It can not only recover the vehicle vibration energy caused by the uneven road excitation by using the feedback braking characteristics of the motor to a certain extent,but also carry out active control to improve the performance of the suspension system.The main research contents are as follows:First of all,this paper describes the design requirements of the energy feedback suspension,i.e.the basic parameters of the prototype car for the design of the suspension and the prototype car for the wonder pure electric formula car of Liaoning University of Technology.It introduces eight kinds of main energy regenerative suspensions,analyzes the structure and working principle of the eight kinds of energy regenerative suspensions,and objectively describes the advantages,disadvantages and shortcomings of the energy regenerative suspensions.The ball screw regenerative suspension is the most feasible structure.Comparing the comprehensive performance of motors,the permanent magnet brushless DC motor is selected as the regenerative motor.The ball screw energy regenerative suspension is composed of permanent magnet DC brushless motor,ball screw mechanism and other accessories.With the help of the CATIA 3D model and system parameters design of the energy regenerative suspension,the ball screw energy regenerative suspension is designed.Secondly,the ball screw model,the energy regenerative shock absorber model,the pavemnet input model,the 1/4 vehicle traditional suspension vehicle model,the 1/4 vehicle energy regenerative suspension vehicle model and the related simulation verification are built by AMESim software.Then,the fuzzy controller is designed in combined with the 1/4 vehicle energy regenerative suspension vehicle model.The same random pavement excitation signals are input into the co-simulation model of active energy regenerative suspension and the 1/4vehicle traditional suspension vehicle model.The simulation contrast test is carried out with BA,SWS and DTL as the indexs.Finally,the vibration energy dissipated by the traditional suspension shock absorber and the energy demand of the active energy regenerative suspension are estimated.An energy management strategy is designed for the switching of motor working mode.The simulation test of the vehicle running at different speed on the level B pavement is carried out,and the qualitative relationship between the energy recovery ability of the energy regenerative suspension and the vehicle speed is obtained.The research results show that the energy regenerative active suspension designed in this paper can provide damping force to attenuate vibration compared with traditional suspension,and can convert vehicle vibration energy caused by uneven road excitation into electric energy,and store this part of electric energy in battery for the use of vehicle electronic and electrical equipment,which solves the problem that traditional suspension can not recover energy.Compared with the traditional suspension,the energy regenerative suspension with fuzzy controller can be used for active control,which solves the problem that the performance parameters of the traditional suspension can not be adjusted,so as to improve the ride comfort of the vehicle effectively.