The Performance Study Of Vehicle Regenerative Suspension With Linear Motor

Suspension is an important part in modern cars,the performance parameters of traditional passive suspension can not be adjusted according to the vehicle running conditions,so at the beginning of the design is not able to take into account the vehicle ride comfort and operation stability,the traditional passive suspension damper suspension vibration energy to energy consumption,so as to decay from the ground caused by shock and vibration.But the decay process will be a big part of the energy wasted,and improve energy efficiency,energy saving and emission reduction is contrary to the theme of the times,so how will the vehicle suspension vibration in the process of converting energy efficient car can use energy,has become the current research hotspot.In order to solve the problem that the traditional passive suspension can not be adjusted and the vibration energy can not be recovered in two aspects,this paper presents and designs a kind of linear motor fed energy suspension,the dynamic damping performance and energy recovery performance of the suspension are studied.Based on the analysis of energy regenerative suspension working mechanism and structure on the basis of a linear motor actuator,The mathematical model of the linear motor actuator,the model of the automobile energy suspension,and the model of the road surface roughness are established.Simulation of active control of linear motor fed suspension using Matlab/Simulink,According to the evaluation indexes of the feed energy suspension,the dynamic response and energy consumption of the suspension with different control strategies,different road grades and different driving conditions are analyzed.Based on the theoretical analysis,the relationship between the suspension parameters and the energy efficiency is obtained.It is found that the energy efficiency of the feed suspension can be related to the damping coefficient of the suspension,the winding resistance of the motor and the resistance of the feed circuit,and the influence of suspension damping coefficient on vehicle dynamic performance and energy recovery.Build the simulation model including the feed energy suspension,the feed energy circuit and the super capacitor and so on.The prototype of the experimental feed energy suspension is designed,and the test bench is reconstructed.The feed circuit is designed.Finally,the experimental research on the linear motor fed suspension is carried out.Through simulation and experiment: uniform driving on different road surfaces,suspension of active control strategy has a good promotion on the dynamic performance of the car,the best LQG performance.But in the initial acceleration,overtaking acceleration and deceleration and parking conditions,the control strategy of suspension pitching acceleration control effect is poor,prone to car "nod" phenomenon;Based on the simulation and bench test,the output energy suspension is obtained under sinusoidal excitation input,Compared with the traditional passive suspension,the root mean square value of sprung mass acceleration is reduced by about 25%,Energy recovery efficiency can reach about 20%,The design of the energy dissipation suspension has good damping effect and can realize the recovery of vibration energy.