Research On Nonlinear Modeling And Control Strategy Based On Electro-hydraulic Servo Active Suspension

Emergency rescue vehicles generally work under complex and harsh working conditions and have high performance requirements for the vehicles.The suspension system is an important part of the vehicle,and a well-designed suspension system can improve the stability and safety of the vehicle.Compared with passive suspension,the active suspension system has greater advantages in improving the ride comfort and stability of the vehicle.Therefore,the study of emergency rescue vehicles with active suspension systems and their suspension control strategies has great advantages for emergency rescue vehicles.Great application value..This article relies on the national key research and development project "High-mobility emergency rescue vehicles(including fire-fighting vehicles)special chassis and suspension key technology research",with the goal of controlling the body’s stable attitude and improving the ride comfort of emergency rescue vehicles under complex working conditions.,To carry out research on electro-hydraulic servo active suspension system and related control strategies.The research content of this paper mainly includes the following points:In order to improve the response speed and control accuracy of the actuator,a quarter active suspension dynamic model and a nonlinear model of the hydraulic actuator are established,and a genetic algorithm PID controller is designed.The simulation results show that the genetic algorithm PID controller has a large Improve the response speed and control accuracy of the actuator.There are multiple non-linear components in the vehicle suspension system.In order to improve the modeling accuracy,a non-linear vehicle active suspension model is established.The research problem in this paper is the multi-objective constraint of the nonlinear uncertain active suspension.Therefore,a constrained backstepping controller is designed,and an adaptive projection operator is introduced to adjust the uncertain parameters in the system.The simulation verifies that the adaptive backstepping controller can better control the body attitude and greatly improve the ride comfort.The active and passive suspension tests were carried out using the test prototypes,and the analysis of the collected test results showed that the active suspension was significantly better than the passive suspension in controlling the body attitude and improving the ride comfort of the vehicle.