A on - identify model of proportional valve pressure controlled system was established though analyzing the configuration of dbetr type proportional pressure relief valve firstly , and then using classical step response method to identify system parameter , a practicable system simple model was deduced at last 摘要从dbetr型比例压力溢流阀结构出发，先建立比例阀控制压力系统的待辨识模型，再采用经典的阶跃响应法辨识系统参数，得到工程上适用的系统简化模型。
And then , a method of load - flow low - pressure measurement was proposed in the light of the hydraulic - resistance theory of servo valve . the validity of the method was proved by the experimental results . therefore , the measurement of the characteristic of load - flow and no - load flow can be realized by using this method 然后根据电液伺服阀的液桥理论提出了一种负载流量低压测量方法，在所开发的测试系统上，利用电液比例阀模拟流量测量装置对所提出的方法进行了试验验证，实现了利用低压流量计和压力传感器进行电液伺服阀负载流量特性和空载流量特性的测量。
That is , through analysis of the principle on flow control and " hydraulic transistor " , design and calculation of flow control characteristic as well as main parts in valve inner chamber , a piloted reducing valve will be installed between main valve and pilot valve . after a pressure - difference compensating reducing valve was added in the non - pressure compensating piloted reducing valve of the flow control valve in vlalvistor valve , the calculation on control characteristic emulation and load characteristic emulation has been carried out . the result of the calculation shows that after pressure compensating reducing valve was added , the linearity of the control characteristics has been greatly improved thus eliminating influence upon outlet flow by load pressure - change of the hydraulic system and improving performance characteristics of the hydraulic component 文章还在对瑞典valvistor阀的插装比例阀研究的基础上，提出了一种新的流量控制原理，即：通过对流量控制和“液压晶体管”原理的分析、流量控制特性及阀内腔主要结构件的设计计算，在主阀和导阀之间增设先导减压阀，并进一步对valvistor阀的流量控制阀之无压力补偿先导减压阀、加入压差补偿减压阀后的控制特性进行了仿真计算和负载特性仿真计算，结果表明：增设压力补偿先导增压阀后，其控制特性曲线变得非常线性，从而消除了液压系统负载压力变化对主阀输出流量的影响。
This paper analyses the type , function and characteristics of usual proportional control valves and raises a new modificative version in the light of their drawback . that is , basing on the principle of flow amplification and electrical feedback and throughout calculation and analysis on flow closed loop control and pressure flow combination . , determination of the minimum controlled pressure difference as well as flow controlling range and structure of main valve and research of the dynamic and static characteristic , the paper puts forward control principle of " flow - load pressure change - displacement revision " and pressure / flow double closed loop , and further expounds that using a proportional controller and a electric mechanical transducer can separately serve the control function of pressure or flow as well as flow pressure combination 本论文分析了目前常用比例阀的类型、功能、特性，并针对其不足提出新的改进方案，即：以流量放大，电反馈两个原理为基础，通过对流量闭环控制及压力流量复合的计算分析、确定上最小控制压差及流量控制范围，确定主阀结构、功能特性研究等，提出了“流量? ?负载压力变化? ?位移修正”的控制原理和压力流量双闭环控制原理，并进一步论述了利用一个比例控制器和一个“电?机械转换器”就可完成独立的压力或流量控制功能以及流量压力复合控制功能。
The objective of this dissertation is a kind of press - high speed numeric control oil - press . with a theoretical analysis and study about proportional control system , this paper sets up the mathematical model of proportional valve controlled non - symmetry hydraulic cylinder via the hydraulic system model building . then analyzes and modifies the model based on the matter of this study , and simulates the model with matlab software to confirm pid parameters , thus designs the pid controller 本学位论文针对一具体的研究项目?高速数控压机的开发，对比例控制系统进行理论分析与研究，通过对液压系统的精确建模，建立起比例阀控非对称液压缸的数学模型，然后根据所研究问题的实际情况对模型进行必要的分析和修正，再运用仿真软件matlab分析系统模型及确定pid控制参数，设计出pid控制器，使得控制系统的设计具有更多的可靠性和灵活性，最后运用pic单片机实现此控制，并结合整机调试试验验证了pid控制的成功。
Electro - hydraulic control principle applied in construction machinery is analyzed in this paper ; working principle and application characteristic of electro - hydraulic proportional is lucubrated ; technique and static characteristic of electro - hydraulic proportional decompression value and electro - hydraulic proportional direction value is emphatically analyzed and studied ; electro - hydraulic proportional control mode is setup . the hydraulic circuit which can be not only suit for handle operation but also for remote operation in the same construction machinery , and the hydraulic system design methods is also introduced that the proportion control use d for the steering devices and the working devices of the machine 本文对工程机械上应用的电液控制原理进行了分析；对电液比例阀的工作原理和应用特点进行了深入研究；重点对电液比例减压阀和电液比例方向阀技术特征和静态特性进行分析研究；建立电液比例控制模型；提出了在同一台工程机械上，既能满足遥控又能满足手控的液压回路，以及采用比例量控制行驶和工作装置的液压系统设计方法。
Air filtration portfolio , air filters , valve , oil mist machine , filter valve , oil mist separator , micro - mist separator , stability activated solenoid valve , pressure gauge , micro - valve and vacuum valves , links the release of the closure - pressure valves , and pipe connection , a one - way valve , t - shelves , shelves , brackets , diaphragm - type flow switches , blades type flow switches , further growth actuator , the valve lock , precision valve , pressure switches , mechanical pressure switches , pneumatic control ratio positioning devices , and electric - gas ratio positioning devices , and telecommunications - pressure converters , electro - pneumatic proportional valve , filter valve , shuttle valve , gas - electric relay and gas indicator , delay pneumatic valve and cylinder fcl , plumbing fcl , mufflers and exhaust cleaner , the excess flow valve with silencer , a one - way valve , rapid valve , rapid joints , rapid valve with fcl , rapid joint sub - cluster gas , micro joints , gas pipes , pipe from the devices , and helical coils , pipes , channels , scissors , multiple fastener , high - speed rotary joint , 10000 threaded joints , and insert the tube joints , rotary joints began , 68 . 25 rapid joints and hoses , hose fittings and rapid non - electrostatic 空气过滤组合空气过滤器减压阀油雾器过滤减压阀油雾分离器微雾分离器稳定启动电磁阀压力表微型减压阀减压气阀三通释放式截流阀压力开关管接头单向阀t型隔板隔板托架膜片型流量开关浆叶型流量开关增速继动器锁定阀精密减压阀压力开关机械式压力开关气控比例定位器电-气比例定位器电讯号-气压转换器电-气比例阀过滤减压阀梭动阀气-电继电器气源指示器气动延时阀气缸限流器管道限流器消声器排气洁净器限流阀带消声器单向止回阀快速排气阀快速接头快速排气阀带限流器快速接头集束分气微型接头气喉管喉管脱离器螺旋管排管管道剪刀多管扣件高速旋转接头万用螺纹接头插入式管接头旋式紧锁接头难燃性快速接头和软管不带静电快速接头和软管
Chapter 2 describes the working theory of the hydraulic elevator control system , and introduces the components of this system , especially the vsvii integrated valve , which could be regulated by the controller of single chip processor with flexible control strategy . also the mathematical models for the hydraulic elevator control system with vsv ii valve are derived and the simulation is made 论文的第二章主要介绍采用轿厢速度反馈电液比例控制的液压电梯的工作原理，分析了本课题所采用的控制系统的各个组成部分，特别介绍了本课题组自行研制的vsv型液压电梯专用比例阀和计算机监测系统，并对液压电梯速度控制系统进行了建模和仿真。
Based on the work of the predecessors in the hydraulic - elevator projects , two proportional flow valves are introduced , one is in charge of the up task of the elevator and the other in charge of the down control . the structure features , working principles of the integrated valve are described in details . the static and dynamic mathematical models of the integrated valve are derived 在对两种有代表意义的阀控系统深入分析的基础上确立了本阀的方案，采用双比例阀分别控制电梯的上行和下行，对提高集成阀上行和下行的控制性能起到重要作用；对集成阀的结构和工作原理作了深入的剖析；针对集成阀的各个环节，建立了相应的稳态和动态数学模型，为集成阀的理论计算和仿真研究提供理论依据。
Until now , there have had the single way proportional valve controlling the power or the route , double way ratio valve controlling the orientation . they cover flux control , pressure control , velocity control and position control . according to these functions , ratio amplifier has single way or double ways type amplifier 由于比例阀已经发展出单通道力、行程控制比例阀，双通道方向控制比例阀，广泛用于流量、压力、速度、位置控制等环节中，比例放大器也本着这些功能研制出了单、双通道的比例电控器。
