Design Of Control System And Analysis Of Energy Feed Characteristics For Electric Vehicles Active Suspension

Electric vehicles have the advantages of pollution-free and high energy conversion rate,and are considered as the development direction of future automobiles.Automotive suspension systems are an important part of the performance of automobiles.Active suspension systems can adapt to different driving conditions and provide the most real-time The main driving force is to improve the ride comfort of the car and significantly improve the comfort of the car.Due to the problems of complex structure,large cost and high energy consumption,its application in electric vehicles is limited.The energy-fed active suspension can not only perform active control to improve the driving performance of the car,but also use the energy-feeding characteristics of the actuator motor to recover part of the body’s vibration energy,reduce the energy consumption of the active suspension system,and reduce the mileage of electric vehicles Energy consumption pressure to improve its applicability to electric vehicles.This article takes electric vehicle energy-feeding active suspension as the research object,and conducts research on the design and energy feeding characteristics of the vehicle’s active suspension control system.The main research contents of the paper include:(1)Considering the ride comfort and handling stability,the optimal control system for the active suspension is first designed,and the analytic hierarchy process is used to determine the values of the weight coefficients of the performance indicators in the optimal control system.Through simulation analysis,the optimal control system can significantly improve the smoothness of the car and ensure the stability of the vehicle’s handling.The applicability of the analytic hierarchy process in determining the weight coefficient of the optimal control system is verified.Then,based on the optimal control system,the idea of composite control is applied,and fuzzy control and optimal control are combined to design a composite control system of active suspension to further improve the driving performance of the car.(2)Determine the structure of the electromagnetic actuator of the permanent magnet synchronous motor combined with the ball screw as the actuator of the active suspension system.Based on the analysis of the four-quadrant working principle of the motor and the energy flow in the working circuit,combined with the ball screw transmission principle,From the perspective of energy recovery,the mode variable of the electromagnetic actuator is derived.According to the mode variables,the energy recovery strategy of the active suspension system was formulated,and the working mode of the electromagnetic actuator was divided into three working modes:"active mode","energy feeding mode" and "braking mode",and the corresponding electromagnetic systems were designed.Control circuit for switching the operating mode of the actuator.(3)Taking the energy feeding efficiency and self-supplying efficiency as the evaluation criteria for energy recovery of the active suspension system,the factors affecting the energy recovery of the active suspension are theoretically analyzed.Based on this,the structural parameters of the active suspension system are designed and designed.The main parameters of the electromagnetic actuator are matched.According to the active suspension energy recovery strategy,a simulation model of energy recovery was built in Matlab/Simulink,and the influence of the electromagnetic force coefficient of the electromagnetic actuator motor on the energy recovery efficiency of the active suspension was analyzed.Under different driving conditions,the analysis The self-supply efficiency and energy-feeding efficiency of the energy recovery of the electromagnetic actuator are described.(4)The fast response of the output torque of the electromagnetic actuator is the key to ensuring the performance of the active suspension system.In order to improve the response characteristics of the active suspension system,a dual-loop control system of the active suspension system is designed.The main loop control system uses an optimal control system to control the active suspension.According to different driving conditions,the required force of the active suspension system is calculated in real time.The torque tracking circuit uses the direct torque control strategy of the permanent magnet synchronous motor to control the active suspension.The electromagnetic actuator is used for output torque control.The simulation results show that the electromagnetic actuator has good torque response and torque following characteristics,and meets the torque requirements of the active suspension system.