闭式泵控马达液压系统转速控制仿真研究

Simulation Research on Speed Control of Closed Pump Control Motor Hydraulic System

工程机械的行走速度主要靠阀控马达液压系统来实现控制。针对阀控马达系统节流损失严重,能耗大,发热现象明显等问题,设计了闭式泵控马达液压系统。并运用AMESim搭建系统的液压物理模型,针对系统采用经典PID控制响应速度慢,抗干扰性能差的问题,设计了模糊PID控制器,并搭建模糊控制器Simulink模型,对系统进行联合仿真。结果表明:采用模糊PID控制系统相比经典PID控制系统,响应速度提升了30.2%,在遇到负载突变时,系统的调整速度提升了69.3%,速度跟踪误差也更小。系统对马达转速输出的控制能力增强,并具有更好的鲁棒性。

The walking speed of construction machinery is mainly controlled by valve controlled motor hydraulic systems.A closed pump controlled motor hydraulic system is designed to address issues such as severe throttling losses,high energy consumption,and significant heating in valve controlled motor systems.The article uses AMESim to build a hydraulic physical model of the system.In response to the problems of slow response speed and poor anti-interference performance of the system using classical PID control,a fuzzy PID controller is designed,and a Simulink model of the fuzzy controller is built for joint simulation of the system.The results show that compared with the classical PID control system,the response speed of the fuzzy PID control system is improved by 30.2%.When encountering sudden load changes,the adjustment speed of the system is increased by 69.3%,and the speed tracking error is also smaller.The system has enhanced control capability over motor speed output and has better robustness.