• Title/Summary/Keyword: 비례유량제어밸브

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Analysis of dynamic characteristics of proportional control valve for auto-steering tractor (자동 조향 트랙터용 비례제어밸브의 동특성 분석)

  • Min, Yee-Seo;Kim, Yong-Joo;Kim, Wan-Soo
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.15 no.5
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    • pp.349-359
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    • 2022
  • The aim of this study is to analyze the dynamic characteristics of proportional control valves according to various working conditions as a basic study for developing proportional control valves for auto-steering tractors. The dynamic characteristics of proportional valves were measured using hydraulic characteristics measurement system, and the power was analyzed using measured flow rate and pressure data. As the experimental conditions, the tractor engine speed and steering angle was selected as the main variables, and the experiment was performed on urethane road conditions. As a result, it was found that the flow rate, pressure, and power of the proportional control valve increased as the tractor engine speed and steering angle increased. In particular, as the steering angle increased at the same engine speed, the flow rate, pressure, and power tended to increase by up to 190%, 172%, and 273%, respectively. Similarly, as the engine speed increased at the same steering angle, the flow rate, pressure, and power tended to increase up to 161%, 122%, and 168%, respectively. Therefore, it can be seen that the steering angle has a higher influence on the dynamic characteristics of the proportional control valve than the engine speed.

A Method for Estimating Fluid Force in Proportional Directional Control Valves with Spool (스풀형 비례 방향/유량제어밸브의 유체력 검증법)

  • Lee, I.Y.;Son, J.M.;Shin, H.B.;Son, J.H.
    • 유공압시스템학회:학술대회논문집
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    • 2010.06a
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    • pp.109-115
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    • 2010
  • In establishing a simulation program for hydraulic valves, it is always a big obstacle to incorporate correctly flow forces on valve body into the simulation program. This paper suggests a method to estimate flow forces on spool in proportional directional/flow control valves with spool structure. Furthermore, suggests a way to obtain simulation program for spool valves, in which flow force mechanism is fully reflected.

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Liner Analysis of IMV Proportional Flow Control Valve Static Characteristics (IMV 비례 유량제어밸브 정특성 선형해석)

  • Jung, Gyuhong
    • Journal of Drive and Control
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    • v.16 no.4
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    • pp.56-64
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    • 2019
  • Recently, as the environmental regulation for earth moving equipment has been tightened, advanced systems using electronic control have been introduced for energy savings. An IMV(Independent Metering Valve), which consists of four 2-way valves, is one of the electro-hydraulic control systems that provides more flexible controllability and potential for energy savings in excavators, when compared to the conventional 4-way spool valve system. To fully realize an IMV, a two-stage bi-directional flow control valve which can regulate the large amount of flow in both directions, should be developed in advance. A simple design that allows proportional flow control to apply the pilot pressure from the current-controlled solenoid to the spring loaded flow control spool and thus valve displacement, is proportional to the solenoid current. However, this open-loop type valve is vulnerable to flow force which directly affects the valve displacement. Force feedback servo of which the position loop is closed by the feedback spring which interconnects the solenoid valve and flow control spool, could compensate for the flow force. In this study, linearity for the solenoid current input and robustness against load pressure disturbance is investigated by linear analysis of the static nonlinear equations for the IMV proportional flow control valve with feedback spring. Gains of the linear system confirm the performance improvement with the feedback spring design.

Static Analysis of Dedicated Proportional Flow Control Valve for IMV (굴삭기 IMV용 비례 유량제어밸브 정특성 해석)

  • Jung, Gyuhong
    • Journal of Drive and Control
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    • v.15 no.4
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    • pp.39-47
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    • 2018
  • Recently, as environmental regulations for earth-moving equipment have been tightening, advanced systems such as electronic control, have been introduced for energy savings. An IMV (Independent Metering Valve) consisting of four 2-way valves, is an electro-hydraulic control systems that provides more flexible controllability, and potential for energy savings in excavators, when compared to the conventional 4-way spool valve system. To fully maximize use of an IMV, the bi-directional flow control valve that can regulate a large amount of flow in both directions, should be adopted. The hydraulic circuit of an IMV applied to an excavator from an overseas construction equipment company, reveals the flow control valve with the compound of proportional solenoid valve for first stage, and 2-way spool valve for the second stage. Moreover, the two spools are interconnected by a feedback spring, presumed to compensate for flow force acting on the second stage spool. This paper addresses the static analysis of flow control valve in an IMV to investigate the improvement of robustness, against flow force by the feedback spring. From the steady-state analysis of flow control valve model, it can be concluded that the feedback spring facilitates maintaining linearity of spool displacement for control input, and relatively constant flow for load disturbance.

Effects of Open Area Ratio of Secondary Injection Flow Valve on Thrust, Side Thrust and Roll Moment of Solid Rocket Motor (2차분사 유량 조절 밸브 개도가 고체 로켓 모터의 추력, 측추력 및 롤 모멘트에 미치는 영향)

  • Kim, Sang-Min;Hwang, Yong-Sok;Yoon, Woong-Sup
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.225-229
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    • 2012
  • 대기가 희박한 고고도 환령이나 급격한 선회를 위해 2차분사에 의한 추력벡터제어를 사용한다. 8개의 2차분사구를 갖는 고체로켓모터를 대상으로, 2차분사의 유량을 조절하는 밸브의 개도가 추력, 측추력 및 롤 모멘트에 미치는 영향을 해석적으로 연구하였다. 정상 상태의 3차원 Reynolds Averaged Navier-Stokes 식의 해를 구하였으며, 난류를 위해 Spalart-Almaras 모델을 사용하였다. 수치해석의 타당성을 평가하기 위해 실험 결과와 해석결과를 비교하였다. 밸브의 개도가 증가함에 따라 추력은 감소하나 측추력은 증가한다. 반면, 롤 모멘트의 경우, 밸브와 2차분사 파이프의 상호작용에 의해 개도에 비례하지 않는다.

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Design of Intelligent Servocontroller for Proportional Flow Control Solenoid Valve with Large Capacity (지능형 대용량 비례유량제어밸브 서보컨트롤러 설계)

  • Jung, G.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.8 no.3
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    • pp.1-7
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    • 2011
  • As the technologies of electronic device have advanced these days, most of mechanical systems are designed with electronic control unit to take advantage of control parameter adaption to operating conditions and firmware flexibilities as well. On-board diagnosis, which detects the system malfunction and identifies potential source of error with its own diagnostic criteria, and fail-safe that can switch the mode of operation in view of recognized error characteristics enables easy maintenance and troubleshooting as well as system protection. This paper dealt with the development of diagnosis and fail-safe function for proportional flow control valve. All type of errors related to valve control system components are investigated and assigned to a specific hexadecimal codes. Cumulative error detection algorithm is applied in order for the sensitivity and reliability to be appropriate. Embedded simulator which runs simultaneously with system program provides the virtual error simulation environment for expeditious development of error detection algorithm. The diagnosis function was verified both with solenoid valve and embedded simulator test and it will enhance the valve control system monitoring function.

Proportional Gas Flow Control Valve Using Piezo Actuator (압전액추에이터를 이용한 비례 가스유량제어밸브)

  • Yun S.N.;Kim C.Y.;Ham Y.B.;Lee K.W.;Kang J.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.2 no.3
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    • pp.6-11
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    • 2005
  • A household gas valve is used for flow control of LPG(Liquefied Petroleum Gas) or LNG(Liquefied Natural Gas) of which pressure is about $200mmH_2O(\fallingdotseq\;0.0196[bar])$. Currently, two kinds of valves such as rotary type and button type are widely used in many applications. But, these valves have some problems that they are not controllable and reliable. Piezo actuation combined with modem microelectronics provides a reliable, quiet, low energy, infinitely adjustable gas valve. In this paper, gas valve using piezo actuator which are bimorph and a circle type was studied. Also, Prototype for gas valve was manufactured and characteristics of the prototype gas valve were analyzed.

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Friction Torque Analysis of a Hydraulic Motor-Load System using Proportional Control Valve (비례제어밸브를 이용한 유압모터 부하계의 마찰토크 해석)

  • Yu, Hwan-Shin;Park, Hyung-Bae
    • Journal of Advanced Navigation Technology
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    • v.14 no.5
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    • pp.760-766
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    • 2010
  • In this paper, The static friction torque and viscous friction torque including hydraulic motor-load system driven by hydraulic proportional control valve analysis. The basic experimental was performed toward characteristic in pressure and flow rate in hydraulic system energy. The variable of friction torque was experiment on brake pressure variable using pneumatic brake system. The analysis of nonlinear friction and linear friction was perform ed toward friction characteristic of hydraulic system.

A Study on Dynamic Characteristics Improvement of Fast Response Proportional Flow Control Valve (고응답 비래 유량제어 밸브의 동특성 향상에 관한 연구)

  • 김고도;김원수;이현철;윤소남
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.1053-1057
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    • 1996
  • The purpose of this study is to bring out the optimal design factors which effect on dynamic characteristics in the design of proportional flow control valve with fast response characteristics, and to verify the validity of the design factors In this study, force feedback type flow control valve with nozzle-flapper is studied. And, the influences which fixed orifice, nozzle diameter, and maximum displacement between nozzle and flapper effect on dynamic characteristics are analyzed. We have done simulations using the optimal design factors and simulink(Matlab) as a simulation tool, and verified the validity of our simulations by means of comparison our simulation results with an experimental results of another similar valve.

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