• Title/Summary/Keyword: Solenoid On-Off Valve

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PWM Control of On-Off Valves using MR Fluid Spool (MR유체 스풀을 이용한 온-오프 밸브의 PWM제어)

  • 양택주;배형섭;박명관
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1709-1712
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    • 2003
  • Almost the on-off type solenoid valve is used to hydraulic system. It has a strong point that concerned about rapid response, electric and hydraulic characteristic at the same time. In this paper we produced the new type spool using the MR fluid different from the others. Also we controlled a cylinder position through PWM method. And using the AMESim software, We compared our new type spool valve with existed one from data of simulation and experiment.

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Operating Performance of Solenoid Valve and Nozzle Sets for Target Selectable Sprayers (이동형 국소 분무장치용 전자 밸브와 노즐 조합 작동특성)

  • Suh, S.R.;Kim, H.O.;Kim, Y.T.;Choi, Y.S.;Yoo, S.N.
    • Journal of Biosystems Engineering
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    • v.31 no.1 s.114
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    • pp.39-45
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    • 2006
  • Fundamental informations on performance of sets of solenoid valve and nozzle were necessary to develop a target selectable spraying system. The experiments were performed for the sets of solenoid valves and flat spraying nozzles at 3 levels of the operating pressures, and the obtained results are as follows; Rise time of the system pressure to reach up to 90% of the operating pressure after the valve turned was affected by nozzle size and operating pressure. Maximum overshoot of the system pressure was about 170% not affected by the sets of valve and nozzle and operating pressure. The system pressure after its settle down within 5% of the set pressure showed good uniformity in any condition of the experiment as less as 2.3% of its coefficient of variation. Time requirement to lower the system pressure down to 50% after the valve power turned off was affected by valve and nozzle set and operating pressure.

Development of Intelligent Solenoid Valve Controller for Dust Collecting System (집진장치용 지능형 솔레노이드 밸브 제어기의 개발)

  • Kang, Moon-Sung;Hong, Sung-Hun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.53 no.2
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    • pp.82-88
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    • 2004
  • In this study, an intelligent solenoid valve controller has been developed for efficient maintaining of filters in a dust collecting system. This controller has automatic controllability of solenoid valves' ON/OFF time depending on the clogging status of filters, and then it can extend the filters' lifetimes, decrease the power consumption, and make effective operation of the system possible. This controllability has been executed by the fuzzy theory that utilizes the workers' experimental knowledges, the control expert's knowledges and the differential pressures between the inlets and outlets measured by the sensors. The system's operation is under the continuous surveillance by using a current transformer, which warns the operators and lets them take necessary actions in case of abnormal operation.

Empirical Design of an On and Off Type Solenoid Actuator For Valve Operation

  • Sung, Baek-Ju;Lee, Eun-Woong;Kim, Hyoung-Eui
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.4B no.2
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    • pp.39-46
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    • 2004
  • Modern users demand that the on and off type solenoid actuator should be smaller, lighter in weight, lower in consumption power, and higher in response time. The complete design satisfying such requirements can be achieved when electromagnetic theories and empirical knowledge are combined. This paper presents various types of empirical coefficients essentially needed for optimal design of a solenoid actuator. The values of these empirical coefficients are obtained through extensive experiments over a great length of time for various kinds of solenoid actuators. We have developed a design program that is composed by combination of governing equations and empirical coefficients, and have also manufactured a prototype solenoid actuator based on the final results of the design program. The propriety of the design program and empirical coefficients have been proven by experiments.

Experimental Study on the PWM Pressure Control Characteristics of 2 Way Solenoid Valve (2방향 전자밸브 PWM압력제어특성의 실험적 비교연구)

  • 정헌술;박성진;김창완
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.107-111
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    • 1997
  • Pressure control is possible by pulse width modulation signal driving a simple ON/OFF 2-way valve of hydraulic servo system. But it indices pressure fluctuation due to repeated on-off action and the pressure varies according to the duty ratio and carrier frequency. So mean pressure and ripple amplitude are arranged by experimental study as the driving signal change which decides the pressure characteristics. As the result selection criteria of the major design parameters may be established and the basic strategy to suppress the unnecessary flucturion may be provided for a hydraulic pressure control system.

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A study on the variable damping characteristics of the continuous controlled semi-active suspension system and the effect analysis of the vehicles motion performance (연속제어방식의 반능동형 전자제어 현가장치의 가변댐퍼 감쇠력 특성 연구 및 차량 운동성능에 미치는 효과 분석)

  • 소상균;조경일
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.8
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    • pp.190-198
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    • 1999
  • Continuously controlled semi-active suspension system may improve ride and handling properties. Here, as a mechanism to control the fluid flow solenoid valve mechanism is introduced and added to the basic passive damper to create damping forces of the shock absorbers. The system may produce continuously controlled damping forces in both solenoid valve only and combination with passive shock absorber including fluid flow is studied, and then the combined model is added to the full vehicle model to evaluate its ride and handling performance. Finally, the simulation results are compared to the vehicle models having similar suspension system.

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A Development of Proportional Pressure Control Valve (비례압력제어밸브 개발)

  • Yun, S.N.;Ahn, B.K.;Ryu, J.S.;Ham, Y.B.
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.1041-1046
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    • 2004
  • A proportional pressure control valve has a nonmagnetic ring which is inserted in between a coil and plunger and it can get attraction force in proportion to input current by an influence of control cone. Therefore, a proportional pressure control valve is applied to a servo system as substitution of servo valve and an on-off solenoid valve widely because control of a high level is possible and pollution level is low. The purpose of this study is to develop domestic model of a proportional pressure control valve, and a test model was designed and manufactured through valve system analysis and finite element analysis. And comparison between results of theoretical analysis and static / dynamic characteristics test were carried out on a manufactured test model, and it was confirmed that it has excellent performance in comparison with other foreign products.

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Development of a Hydraulic Level Control System for High-speed Rice Transplanting Machines (고속 이앙기의 유압 수평 제어 장치 개발에 관한 연구)

  • 정연근;정병학;김경욱
    • Journal of Biosystems Engineering
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    • v.27 no.2
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    • pp.79-88
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    • 2002
  • This study was conducted to develop system for high speed rice transplanting machines. The control system includes a sensor detecting the tilt angle of the seedling bed, a micro-controller and a hydraulic system consisting of a double acting cylinder, a four-way three-position solenoid valve, a relief valve and a hydraulic pump. The levelling system shared the pump with the existing steering control, resulting in a tandem center circuit for the steering and levelling control systems. Using the input signal from the sensor, the micro-controller determined and generated the output signal to control the cylinder through the solenoid valve to keep the seedling bed always parallel to the water surface regardless of soil unevenness during the transplanting operations. Both an ON/OFF and a PWM control schemes were tested. When the flow rate was more than 1 ι/min in the ON/OFF control, the system showed unstable rolling. However, in the PWM control, the system worked stably although the flow rate was more than 1 ι/min. The PWM control showed a better performance when a large difference between the angle and the dead band of the control system occurred. The characteristics of tile system response to given tilt angles were predicted by a computer simulation. Both the ON/OFF and the PWM control systems worked well providing that the operating and waiting times were properly adjusted.

A Study on The Control of Humidification and Dew Condensation by On/Off Control (On/Off 제어에 의한 습도와 결로의 제어에 관한 연구)

  • Park, Dea-Heum;Kim, Du-Hee;Kim, Kyoung-Hoon;Jung, Young-Guan
    • Journal of Hydrogen and New Energy
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    • v.22 no.6
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    • pp.835-841
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    • 2011
  • The humidification is essential for performance enhancement of the electrolysis of PEMFC because proton conductivity depends on hydration of the proton exchange membrane. In this study, the humidification experiment did about On/Off control the humidification and dew condensation for PEMFC by using of the membrane humidifiers. As the results, it was possible to approximation control of the humidity by using of the solenoid valve On/Off control on the membrane humidifier. Also the problem on the dew condensation was resolved by approximation humidity control through solenoid valve On/Off control and the removal of the dew condensation in the flow channel was verified through visualization experiment.

Development of Stroke Sensing Cylinder Using Magnetic Sensor and Its Performance Estimation (자기 센서를 이용한 스트로크 센싱 실린더의 개발 및 성능평가)

  • 홍영호;이민철;이만형;양순용;진영일
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.278-282
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    • 1995
  • We developed a part of storke sensing cylinder using magnetic sensor and estimated is performance. In this paper, for the performance estimation of stroke sensing cylinder. We consist of hydrallic system using solenoid valve with ON/OFF motion. In order to the control of solenoid valve for the position control of cylinder rod, PWM (Pulse Width Modulation) method which modulates time pulse width in proportion to error was used. A performance of cylinder rod with magnetic scales was evaluated by its hydraulic system.

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