排量、转速复合泵控差动缸系统特性研究  

Characteristic of Pump Controlled Single Rod Cylinder with Combination of Variable Displacement and Speed

作　　者：王成宾[1] 权龙[1] 

机构地区：[1]太原理工大学新型传感器与智能控制教育部重点实验室,太原030024

出　　处：《农业机械学报》2017年第8期405-412,共8页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51575374);山西省自然科学基金项目(2015011056)

摘　　要：针对传统泵控差动液压缸系统存在液压回路复杂、响应慢和能耗大的问题,提出了一种排量、转速复合控制方法,用1台伺服变量泵直接控制差动液压缸。首先,从理论上分析了泵控差动缸控制原理,将差动缸复合控制系统分为3个子系统分别进行仿真分析,进一步通过内环排量外环转速进行建模仿真分析,复合控制下响应速度比恒定转速下动态特性好。在此基础上搭建试验台,对泵控差动缸进行试验分析,在内环排量外环转速控制下较恒定转速下差动缸系统动态响应快,时间缩短13.4%;将变量泵处于恒压控制模式下,对伺服电机输入能耗进行测量,在不同转速和负载压力下进行试验,低转速大排量下系统能耗可以减少3 kW左右。通过仿真和试验,结果表明,排量、转速复合控制模式下,可有效提高泵控差动缸系统的响应速度,降低能耗。Traditional pump-controlled differential cylinder technology has problems such as complex hydraulic circuit,slow response and high energy consumption. Based on this,a combined control method of displacement and speed was proposed to directly control the differential hydraulic cylinder by using a variable servo pump. Firstly, differential cylinder combined control system was divided into three subsystems based on theoretical analysis of pump-controlled differential cylinder principle. Secondly,the model of the system in which the inner-loop controlled displacement and outer-loop controlled speed was established for simulation. Response speed under hybrid control had better dynamic characteristic than that under constant speed. Thirdly,the test platform was set up for experimental analysis of pumpcontrolled differential cylinder. The dynamic response of differential cylinder controlled by the system in which the inner-loop controlled displacement and outer-loop controlled speed was faster than that controlled by the system of constant speed,which reduced the time by 13. 4%. Under constant pressure mode,the input energy consumption of serve motor was measured. After comparative experiments under different speeds and pressures,the system energy consumption under low speed and large displacement was decreased by 3 kW. Simulation and experiment results showed that the response speed of pumpcontrolled differential cylinder was improved and the energy consumption was reduced effectively under the combined control mode of displacement and speed.

关 键 词：泵控差动缸 复合控制 电液伺服控制 伺服变量泵 永磁式同步电动机 

分 类 号：TH137.7[机械工程—机械制造及自动化]