Research On Application Of Linear Motor Actuator In Active Control Of Automobile Suspension

The suspension system is a necessary structure in the present automobile composition system.Automobile suspension is an important connection between the body and the wheel device,used to transfer the force and the torque generated by the force,automobile suspension can ease the vibration caused by the road,reduce the impact force,to ensure the smooth running of the car on the road.Active suspension can adjust the relevant parameters in real time according to different working conditions of the car to improve the comfort and stability of the car and the safety and reliability of handling.In order to meet the theme of energy conservation and environmental protection,to achieve energy recovery and utilization,namely to achieve energy feed-back.In this paper,based on the purpose of "energy feedback,smoothness and safety",the linear motor actuator is selected to be applied to active suspension,not only to complete active control,but also to achieve energy recovery and utilization.It is very important to study the control method,performance analysis and working characteristics of linear motor actuator deeply to improve the performance of automobile active suspension.In this paper,we study the car active suspension of the linear motor actuator,linear motor actuators are reviewed in detail the physical structure and the working principle of operation,based on the basic control,vector control,will be completed mathematical formula of coordinate system transformation,space vector pulse width modulation principle was adopted to realize variable voltage variable frequency,and finally,with the aid of Matlab/Simulink platform,The control model of linear motor actuator is established.On the basis of the road model,the simplified vehicle dynamics models--passive suspension and active suspension were selected to evaluate the influence elements of suspension setup.Under the uniform conditions,the simulation results of two diverse suspensions were compared.Aiming at the general PID control optimization parameter adjustment,three different control strategies are selected: the first one is FCL-PID control;By using fuzzification,self-tuning parameters are realized.The second is BP-PID control;BP neural network is used to regulate the numbers.The third is PSO-PID control;Using the program setting of particle swarm optimization algorithm,optimize the PID parameter change.After simulation and comparison analysis,the best control method can meet the maximum performance improvement.The control influence of the main force of linear motor actuator is analyzed,especially whether the change of output force meets the demand of active suspension.In order to realize the goal of energy recovery,energy recovery loop is designed to realize energy recovery,and the energy recovery is discussed.The test platform was built to test the performance of linear motor actuator,and the dynamic loading test was carried out to test the motor’s smoothness.The influence of nonlinear characteristics of actuator on automobile suspension in practical work was studied.