• Title, Summary, Keyword: Electronic Valve

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A Study on the Characteristics of the Electronic EGR Valve for Gasoline Engine (가솔린엔진용 E-EGR 밸브 특성에 관한 연구)

  • Park, Cheol-Woong;Kim, Chang-Gi
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.1
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    • pp.127-133
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    • 2008
  • Since the 1960's, exhaust gas recirculation(EGR) has been used effectively in spark ignition(SI) engines to control the exhaust emissions of the oxides of nitrogen(NOx). The most important requirements for the application of EGR systems to conventional SI engines are controllable flow rate and good dynamic response. In order to evaluate the characteristics of the electronic EGR valve, a test bench which is consisted of blower, heater, air flow meter and driving unit for electronic EGR valve was set up to simulate engine operating conditions. During the tests, the valve actuation parameters were controlled and the valve lifts and flow rates were measured to infer the characteristics of EGR valve. The results confirmed the capabilities of mathematical analysis and it seems that the correction for the valve lift and potentiometer output is necessary to achieve precise control of EGR rates.

A Study on the Possibility for the Replacement of a Thermal Expansion Valve to an Electronic Expansion Valve (온도식팽창밸브의 전자식팽창밸브로의 대체 가능성에 관한 연구)

  • Han, Do-Young;Jeong, Seong-Woock
    • Proceedings of the SAREK Conference
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    • pp.695-700
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    • 2006
  • For the precise superheat temperature control of an air conditioner, an electronic expansion valve may be used instead of a thermal expansion valve. In this paper, technical and economical aspects of expansion valves were studied in order to find out the possibility to use an electronic expansion valve to replace a thermal expansion valve.

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Expansion Valves Characteristics for Development of Control System on Air Conditioning and Refrigeration Systems (공조.냉동장치의 제어시스템 개발을 위한 팽창밸브 특성)

  • Kim, J.D.;Jang, J.E.;Yoon, J.I.
    • Journal of Power System Engineering
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    • v.2 no.3
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    • pp.34-40
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    • 1998
  • Performance characteristics of a refrigeration systems with various expansion valves and superheat changes were investigated experimentally. Experimental data have been taken utilizing three different devices; a thermostatic expansion valve, a linear type electronic expansion valve and a solenoid type electronic expansion valve. The data taken from tile three types of expansion valves were discussed with the temperature distribution of each zone in the evaporator and the superheat changes of the evaporator outlet In each zone temperature distribution fluctuated larger with the thermostatic expansion valve than with the electronic expansion valves. The optimum superheat ranged from $5^{\circ}C\;to\;15^{\circ}C$, and the superheat with the thermostatic expansion valve showed hunting phenomenon, which affected the evaporating and condensing temperature.

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Development of Electronic Proportional Control Valve with LVDT for Spool Displacement Feedback and Its Performance Evaluation (스풀 변위 피드백을 위한 LVDT 적용 비례전자제어밸브의 개발 및 성능평가)

  • Shin, Haeng-Bong;Han, Sung-Hyun
    • Journal of the Korean Society of Industry Convergence
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    • v.19 no.3
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    • pp.160-166
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    • 2016
  • This study proposes the development and performance evaluation of electronic proportional control valve having an LVDT. The electronic proportional control valve is composed of hydraulic valve, proportional solenoid and controller. LVDT is to reduce the steady state error for the reference input of the controller by the feedback signal to detect the displacement of the spool. Designed LVDT is applied to the common proportional valve. In order to evaluate the performance of the developed valve, the hydraulic test equipment was developed and flow tests were carried out. From experimental results, it was proved that the hysteresis was less than 1% based on the maximum flow rate.

An Experimental Investigation on the Variation of Heating Performance Due to the Refrigerant Flow Control in a Variable-Speed Heat Pump (가변속 열펌프의 냉매 유량제어에 의한 난방성능 변화에 관한 실험적 연구)

  • 김봉훈
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.8
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    • pp.746-756
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    • 2001
  • An experimental study was conducted to investigated the effect of refrigerant flow control on the performance of a variable-speed heat pump operating in both cooling and heating mode. For this purpose, cooling and heating capacity, EER and refrigerant mass flow rate corresponding to an electronic valve as well as a capillary tube were measured as functions of compressor speed, length of capillary tube (or valve opening of the electronic valve), refrigerant charge, and outdoor temperature. From the comparison of experimental results, it was found that the performance variation due to the electronic valve opening became significant as the operating conditions(outdoor temperature and compressor speed) deviated from the standard condition at which heating capacity and EER were rated for the indicated capillary tube.

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Analysis of Flow Characteristics of Multilayer Type Piezo Valve (적층형 압전밸브의 유동특성 해석)

  • Kim, Jae-Min;Lee, Jong-Choon;Yoon, Suk-Jin;Chung, Gwiy-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.946-949
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    • 2003
  • This paper reports on the fluid flow simulation results of a multilayer type piezoelectric valve. The mechanical and fluidic analysis are done by finite element method. The designed structure is normally closed type using buckling effect, which is consist of three separate structures; a valve seat die, an actuator die and a MLCA(Multilayer Type Ceramic Actuator). It is confirmed that the complete laminar flow and the lowest flow leakage are strongly depend on the valve seat geometry. In addition, turbulent flow was occurs in valve outlet according to increase seat dimension, height and inlet pressure. From this, we was deducts the optimum geometry of the valve seat and diaphragm deflection that have an great influence fluid flow in valve. Thus, it is expected that our simulation results would be apply for piezoelectric applications such as valve and pump, fluidic control systems.

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Characteristics of Capacity Control of Variable Speed Water Cooler with the Electronic Expansion Valve Open/Close Degree (전자팽창밸브 개도에 따른 가변속 수냉각기의 용량제어 특성)

  • Beak, Seung-Moon;Moon, Choon-Geun;Kim, Hyun-Woo;Jeong, Seok-Kwon;Yoon, Jung-In
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.2
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    • pp.282-288
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    • 2010
  • The paper presents the characteristics of capacity control of variable speed water cooler with the electronic expansion valve open/close degree. It is a preliminary study on the optimum control of the water cooler system using a variable speed compressor controlled by inverter. The electronic expansion valve controlled by the variation of compressor speed maintains the constant degree of superheat at the evaporator outlet, which aims to find the degree of superheat obtaining the optimum refrigeration effect. The investigation indicates that there is a point achieving the maximum cooling capacity by the variation of the electronic expansion valve open/close degree with constant compressor speed.

Control of Compressor and Electronic Expansion Valve for a Tandom-type Air-conditioner (텐덤형 냉방시스템의 압축기와 전자팽창밸브 제어)

  • Jung, Nam-Chul;Han, Do-Young
    • Proceedings of the SAREK Conference
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    • pp.469-473
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    • 2005
  • Capacities of a tandom-type air-conditioner may be modulated by turning on/off multiple compressors and adjusting positions of a electronic expansion valve. In this study. control algorithms for compressors and a electronic expansion valve were developed by using fuzzy’ logics. There algorithms were implemented in a test lab and proved to be effective for the control of indoor air temperature and superheat temperature.

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Control of Compressors and Electronic Expansion Valve considering the Safe Operation of a Tandem-type Air-conditioning system (텐덤형 냉방시스템의 안전운전을 고려한 압축기와 전자팽창밸브 제어)

  • Han, Do-Young;Kim, Jae-Hyun
    • Proceedings of the SAREK Conference
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    • pp.675-680
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    • 2006
  • Capacities of a tandem-type air-conditioner may be modulated by turning on and off of multiple compressors, and adjusting the position of a electronic expansion valve. In this study, control algorithms for compressors and a electronic expansion valve were developed by using fuzzy logics. The pressure control algorithm was also developed for the safe operation of compressors. There algorithms were implemented in a test lab and proved to be effective for the control of indoor air temperature and superheat temperature,

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Fuzzy Control Algorithms for the Compressor and the Electronic Expansion Valve of a Multi-type Air-conditioning System using Multiple Input Variables (다입력변수를 사용한 멀티형 공조시스템 압축기와 전자팽창밸브의 퍼지 제어 알고리즘)

  • Han, Do-Young;Park, Kwan-Jun
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.2
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    • pp.163-171
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    • 2006
  • In order to control multi-zone temperatures, a multi-type air-conditioning system may be used. In this study, control algorithms for the compressor and the electronic expansion valve of a multi-type air-conditioning system were developed by using fuzzy logics. The compressor control algorithm was composed of a compressor pressure setpoint algorithm, a compressor pressure setpoint reset algorithm, and a compressor frequency setpoint algorithm. The electronic expansion valve control algorithm was composed of an indoor temperature control algorithm, and a superheat control algorithm. These algorithms were applied to a multi-type air-conditioning system. Test showed good results for the control of a multi-type air-conditioning system.