Based On The Eha, Vehicle Active Suspension Control Algorithm And Experimental Research

The dynamic performance of suspension systems directly influences ride comfort and handling stability of driving vehicles. The fixed parameters of passive suspension systems cause the tradeoff between ride comfort and handling stability. Active suspensions, acting as advanced suspensions, could adjust the control force actively and timely to reduce the vibration according to the working condition, and solve the contradictory perfectly. So the control system of active suspension has been seen in many collaborative research projects.In this paper, a novel vibration damping control technique is introduced into active suspension system based on EHA (Electrical hydrostatic actuator). First, the principles and component of the active systems based on EHA are presented; the mathematical model of the Brushless DC Motor is created according to the working principle of Brushless DC Motor. Based on the model, the integrative models of EHA system are created; then, a vehicle vibration model of 1/4 body is created, which is based on the vehicle dynamics theory. Considering the influence of the input disturbance, a mathematical description of road surface irregularity is established, which is the model of integral white noise, and the model is carried out by simulation in the time domain.Control algorithms are the sticking point of the technology for active suspension control system. In this paper, the principles of skyhook control, groundhook control, hybrid control and fuzzy control are studied, and these control algorithms are analyzed in the actual vehicle suspension system, fuzzy controller is designed; then these control algorithms are simulated by the software Matlab/Simulink. According to the simulation results, skyhook control and groundhook control can improve some performance of vehicle effectively, but also being some limitations. Hybrid control and fuzzy control can improve the integer performance of vehicle. Considering the complexity and feasibility of algorithmic, fuzzy control is an optimal control algorithm.Lastly, the mechanical cam platform is designed, and the platform test of active suspension is carried out. The test results show that control algorithm used in the platform test is effective to improve vehicle ride comfort and handling stability. The result illustrates, the principle of reduce the vibration is reasonable; control algorithm used is effective and feasible.