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

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A Study on PWM Control of Hydraulic Cylinder Using High Speed Solenoid Valve (고속전자밸브를 이용한 유압실린더의 PWM 제어에 관한 연구)

  • Park, S.H.;Lee, J.K.
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.7
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    • pp.138-147
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    • 1995
  • The conventional PWM method, which was used in controlling the on-off valve, such as high-speed solenoid valve, was modulating the width of the pulse applied to the valve, by selecting arbitrary sampling time and modulating the duty-ratio in proportion to the error. However, in this method, a selection of long sampling time was inevitable and it was unable to get a high accuracy and a quick response. This study is for designing an appropriate controller for high-speed solenoid valve by proposing an improved duty-ratio modulation method using the Saw-toothed Carrier Wave which enables a short sampling time selection, high accuracy of control, and a quick response. Test which was carried out in the laboratory shows that transient and steady state response could be improved by PID controller.

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Study on Performance Improvement for Solenoid Valve Cleaner for Automatic Transmission (자동변속기 솔레노이드 밸브 세척기의 성능 향상에 관한 연구)

  • Yang, Hyong-Yeol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.5
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    • pp.1-8
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    • 2009
  • Solenoid valve cleaner is used for clean the solenoid valve in automatic transmission for a car when it is clogged with transmission oil sludge. Nevertheless when the solenoid is turned off, the residual current in the solenoid coil makes slow motion of the plunger in the solenoid which makes lower in cleansing performance and speed. In this paper, the method of performance Improvement for solenoid valve cleaner is proposed. The residual current in the solenoid coil is eliminated rapidly by the proposed method and it improves the cleansing performance and speed. The experimental results show the validity of the reposed method.

Study on the Characteristics of Surge Pressure by High Frequency PWM Control in Braking System (제동장치에서 고주파수 PWM 제어에 의한 맥동특성 연구)

  • Kim, Byeong-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.3
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    • pp.109-114
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    • 2008
  • The solenoid valve of ABS hydraulic modulator is a two directional on-off valve and is controlled by around 100Hz on-off control. When the on-off valve is switched from open state to closed state, there are braking force deterioration, noise and vibration due to surge pressure in the wheel cylinder. In this study, identifies surge pressure in the braking process of ABS, and investigates the way to reduce the phenomenon. To reduce the surge pressure, PWM(Pulse Width Modulation) control with high frequency of 20kHz was attempted. In conclusion, by using the results of this study for the pressure surge prediction, we could expect enhancement of braking performance in ABS.

A Study on the Pressure Control Characteristics of ON/OFF 3-way Solenoid Valve Driven by PWM Signal (개폐식 3방향 전자밸브의 펄스폭 변조 구동에 의한 압력제어 특성에 관한 연구)

  • Jeong, Heon-Sul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.3
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    • pp.485-501
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    • 1997
  • Pressure control is possible driving a simple ON/OFF 3-way valve of hydraulic servo system by pulse width modulation signal. But the pressure varies according to the duty ratio and carrier frequency and repeated on-off action induces pressure fluctuation. So equations for mean pressure and ripple amplitude are theoretically derived as a function of on/off time, the system parameters which decide the pressure characteristics are arranged and they are verified by experimental study. As the result selection criteria for the major design parameters are established and the basic strategy to suppress the unnecessary fluctuation can be provided for a hydraulic pressure control system using these type of valves.

Intelligent Control of Pneumatic Actuator using On/Off Valve (On/Off 밸브를 이용한 공압 실린더의 지능제어)

  • 안경관;표성만;송인성;이병룡;양순용
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.8
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    • pp.86-93
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    • 2003
  • The development of a fast, accurate, and inexpensive position-controlled pneumatic actuator that may be applied to a variety of practical positioning applications with various external loads is described in this paper. A novel modified pulse width modulation (MPWM) valve pulsing algorithm allows on/off solenoid valves to be used in place of costly servo valves. A comparison between the system response of standard PWM technique and that of the novel modified PWM technique shows that the control performance is significantly increased. A state feedback controller with position, velocity and acceleration feedback is successfully implemented as the continuous controller. Switching algorithm of control parameter using learning vector quantization neural network (LVQNN) is newly proposed, which estimates the external loads of the pneumatic actuator. The effectiveness of the proposed control algorithms are demonstrated through experiments with various loads.

Pressure Control of Lockup Solenoid Valve for Automatic Transmission (자동변속기 록업솔레노이드밸브의 압력제어)

  • Park, Kwan-su-;Chung, Soon-Bae;Lee, Kyo-Il-
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.472-477
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    • 1994
  • The lockup clutch is embeded on torque converter of automatic transmission to prevent the efficiency deterioration of torque converter in high speed. For improving fuel consumption rate, it is desirable to engage the lockup clutch earlier. But, it results in degrading shift quality, due to the transient torque. The transient clutch pressure which affects the shifting quality, should be controlled properly. In this study, to solve the problem, it is analysed the hydraulic circuit of lockup system including line pressure regulating circuit, established the nonlinear model, and designed the PID controller. The line pressure is supplied to the lockup clutch through the lockup control valve by switching the lockup solenoid valve on. In order to control the transient pressure actively, it is needed to control the lockup solenoid valve by closed loop control. The lockup solenoid valve is 2-way on-off valve, and is adequate for PWM control. To reduce the pressure chattering, the carrier frequency is increased. Target pressure profile is computed from optimized velocity difference profile throuth dynamic equation of vehicle system.

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Intelligent control of pneumatic actuator using On/Off solenoid valves

  • Insung Song;Sungman Pyo;Kyungkwan Ahn;Soonyong Yang;Lee, Byungryong
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.65.2-65
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    • 2002
  • This paper is concerned with the accurate position control of a rodless pneumatic cylinder using On/Off solenoid valve. A novel Intelligent Modified Pulse Width Modulation(MPWM) is newly proposed. The control performance of this pneumatic cylinder depends on the external loads. To overcome this problem , switching of control parameter using artificial neural network is newly proposed, which estimates external loads on rodless pneumatic cylinder using this training neural network. As an underlying controller, a state feedback controller using position, velocity and acceleration is applied in the switching control the system. The effectiveness of the proposed control algorithms are demonstrated...on/off solenoid valve, load estimation, MPWM, Artificial neural network.

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Injection volume control of carboxy-gun using a solenoid valve (솔레노이드 밸브를 이용한 카복시 건의 주입량 제어)

  • Tak, Tae-Oh;Han, Nam-Gyu;Shin, Young-Kyu
    • Journal of Industrial Technology
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    • v.32 no.A
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    • pp.65-70
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    • 2012
  • Carboxy-guns are used for rapid and precise injection of $CO_2$ gas to the target skin area using external power source. In the design of carboxy-gun, the most important thing is how to precisely control injection volume of $CO_2$ gas. This paper deals with the control scheme of injection volume of carboxy-gun using solenoid valve. First the amount of volume that passes through the solenoid valve under on-off time ratio control is estimated based on the assumption of compressible gas flow. The flow rate of gas is experimentally measured under the varying pressure of the gas reservoir. Two results showed good correlation to each other, thus demonstrating the validity of the volume control strategy.

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Position Control of a Hydraulic Cylinder by a Differential PWM Method (차동PWM방식에 의한 유압실린더의 위치제어)

  • 권기수;이창돈;이진걸
    • Journal of Advanced Marine Engineering and Technology
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    • v.15 no.4
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    • pp.54-69
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    • 1991
  • This study deals with the position control of a hydraulic cylinder system operated by two port 3-way high speed solenoid valve in Pulse-Width-Modulation mode, instead of using conventional electro-hydraulic servovalve. Due to the complexity and the relatively poor reliability of the servovalve, an actuator using simpler and more study high speed solenoid valve will be presented. The high speed solenoid valve acts as converters of electronic pulse signal to hydraulic ones. It has been pointed out that there are practical problems to be solved in the PWM system, that is (1) accuracy of positioning control becomes considerably insufficient because the system is affected by on/off action of the solenoid valves, and (2) serious nonlinerality appears in the valve characteristics as a result of the switching behavior of the valves. As a method to overcome these defects, the differential PWM driving method of a hydraulic cylinder that improved the steady-state-error, flow rate nonlinearity in simple PWM, and the hydraulic hunting of dead time compensated-PWM driving is proposed in this study.

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