基于主动压差调控的变增益流量控制原理  

Variable Gain Flow-control Principle Based on Active Differential Pressure Regulation

作　　者：王波 赵星宇 权龙 赵斌 李运帷 郝云晓 WANG Bo;ZHAO Xingyu;QUAN Long;ZHAO Bin;LI Yunwei;HAO Yunxiao(Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024;College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024)

机构地区：[1]太原理工大学新型传感器与智能控制教育部与山西省重点实验室,太原030024 [2]太原理工大学机械与运载工程学院,太原030024

出　　处：《机械工程学报》2024年第4期134-142,共9页Journal of Mechanical Engineering

基　　金：国家重点研发计划(2019YFB2004502);国家自然科学基金(51975397)资助项目。

摘　　要：压力补偿控制流量方法,应用广泛、控制可靠,但受机械结构限定,存在控制精度低、功能单一、流量范围受限等不足,难以适应主机智能化发展。为此,提出基于主动压差调控的变增益流量控制原理,在补偿器阀芯上增设力控制单元,改变阀芯受力平衡状态,实现主阀压差的主动可调,达到变增益控制流量目的。研究中,首先理论分析压差调控的变增益流量控制原理,并给出比例电磁铁直驱方案;进一步设计扰动补偿策略,解决补偿器控制精度低的难题,设计非线性流量校正策略,自定义设定阀口流量曲线;最后,采用试验验证所提原理和控制策略的可行性。研究结果表明,通过连续控制比例电磁铁输出力,主阀压差、流量能够跟随变化,实时改变压差,主阀能够获得不同的流量增益和流量范围;补偿液动力后,流量控制精度提高,稳态负载下主阀流量控制偏差由补偿前的27%降低至4%;采用非线性流量校正策略后,可自主设定阀口流量曲线,基于同一阀口实现多种节流槽流量控制效果。The flow-control method of pressure compensation is widely used and reliable.But limited by the mechanical structure,there are some shortcomings,such as low control accuracy,single control function,limited flow range and so on,which are difficult to meet the development of intelligent host equipment.Therefore,this study proposes a variable-gain flow-control principle based on active differential pressure regulation.A force control unit is added on the compensator to change the force balance state of the compensator spool,enabling active adjustment of the main valve pressure differential and achieving the purpose of changing gain to control flow.In the study,the principle of variable gain flow control with pressure difference regulation is theoretically analyzed,and a proportional electromagnetic direct drive scheme is given.Then a disturbance compensation strategy is designed to solve the technical problem of the compensator low control accuracy,and a nonlinear flow correction strategy is designed to set the valve flow characteristic curve customize.Finally,experiments are used to verify the feasibility of the proposed principle and designed control strategy.The experimental results show that by continuously controlling the output force of the proportional electromagnet,the differential pressure and flow of the main valve can be changed in proportion,and by changing the differential pressure in real time,the main valve can obtain different flow gains and flow ranges;compensating the flow force,the accuracy of flow control is improved,and the flow control deviation under steady-state load is reduced from 27%to about 4%;adopting the nonlinear flow correction strategy,the main valve flow curve can be set independently,and multiple throttle flow control effects based on the same throttle groove are realized.

关 键 词：压力补偿器 流量控制 压差调控 变流量增益 液动力补偿 非线性流量校正 

分 类 号：TH137[机械工程—机械制造及自动化]