关键词: 电液比例控制, 高空作业车, 调平系统, 动态仿真, 闭环控制系统, 比例-积分-微分控制

Abstract: To study the dynamic characteristics of bucket balancing system and improve its control precision, a new type of electro-hydraulic proportional leveling system for aerial work platform was presented. According to its working principles and structure parameters, the mathematical model of leveling system was established, and the simulation model of electro-hydraulic proportional closed-loop control system was developed based on AMESim. The influences of simulation parameters and Proportional Integral Derivative (PID) controller on dynamic characteristics of system were studied and analyzed. The simulation results demonstrated that the proposed system had better stability, and the performance of system was improved with the changes of original system's proportion and the decrease of leakage coefficient. Besides, the leveling system's response and accuracy were improved obviously by using PID controller.

Key words: electro-hydraulic proportional control, aerial work platform, leveling system, dynamic simulation, closed-loop control system, proportional integral derivative controller