AU4522896A - Feed forward control of expansion valve - Google Patents

Feed forward control of expansion valve

Info

Publication number
AU4522896A
AU4522896A AU45228/96A AU4522896A AU4522896A AU 4522896 A AU4522896 A AU 4522896A AU 45228/96 A AU45228/96 A AU 45228/96A AU 4522896 A AU4522896 A AU 4522896A AU 4522896 A AU4522896 A AU 4522896A
Authority
AU
Australia
Prior art keywords
expansion valve
feed forward
forward control
control
feed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
AU45228/96A
Other languages
English (en)
Inventor
Craig M Goshaw
Daniel C Leaver
Lee Sibik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trane US Inc
Original Assignee
American Standard Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Standard Inc filed Critical American Standard Inc
Publication of AU4522896A publication Critical patent/AU4522896A/en
Abandoned legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
    • F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/02—Details of evaporators
    • F25B2339/024—Evaporators with refrigerant in a vessel in which is situated a heat exchanger
    • F25B2339/0242—Evaporators with refrigerant in a vessel in which is situated a heat exchanger having tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/06—Details of flow restrictors or expansion valves
    • F25B2341/063—Feed forward expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/21—Refrigerant outlet evaporator temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/04—Refrigerant level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Control Of Temperature (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Magnetically Actuated Valves (AREA)
AU45228/96A 1995-02-28 1995-12-15 Feed forward control of expansion valve Abandoned AU4522896A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US396305 1995-02-28
US08/396,305 US5632154A (en) 1995-02-28 1995-02-28 Feed forward control of expansion valve
PCT/US1995/016474 WO1996027108A1 (en) 1995-02-28 1995-12-15 Feed forward control of expansion valve

Publications (1)

Publication Number Publication Date
AU4522896A true AU4522896A (en) 1996-09-18

Family

ID=23566706

Family Applications (1)

Application Number Title Priority Date Filing Date
AU45228/96A Abandoned AU4522896A (en) 1995-02-28 1995-12-15 Feed forward control of expansion valve

Country Status (10)

Country Link
US (2) US5632154A (instruction)
EP (1) EP0811135B1 (instruction)
JP (1) JPH11501114A (instruction)
CN (1) CN1161579C (instruction)
AU (1) AU4522896A (instruction)
BR (1) BR9510519A (instruction)
CA (1) CA2212804C (instruction)
DE (1) DE69515912T2 (instruction)
IN (1) IN186883B (instruction)
WO (1) WO1996027108A1 (instruction)

Families Citing this family (68)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6016966A (en) * 1996-08-26 2000-01-25 Sanden Corporation Air conditioning system for automotive vehicles
US5950443A (en) * 1997-08-08 1999-09-14 American Standard Inc. Compressor minimum capacity control
JP3861451B2 (ja) * 1998-04-20 2006-12-20 株式会社デンソー 超臨界冷凍サイクル
US6050098A (en) 1998-04-29 2000-04-18 American Standard Inc. Use of electronic expansion valve to maintain minimum oil flow
FR2780143B1 (fr) * 1998-06-23 2000-09-08 Valeo Climatisation Boucle de fluide refrigerant amelioree pour installation de climatisation de vehicule
US6085532A (en) 1999-02-05 2000-07-11 American Standard Inc. Chiller capacity control with variable chilled water flow compensation
US6266964B1 (en) 2000-01-10 2001-07-31 American Standard International Inc. Use of electronic expansion valve to maintain minimum oil flow
US6318101B1 (en) * 2000-03-15 2001-11-20 Carrier Corporation Method for controlling an electronic expansion valve based on cooler pinch and discharge superheat
US6370888B1 (en) * 2000-08-31 2002-04-16 Carrier Corporation Method for controlling variable speed drive with chiller equipped with multiple compressors
JP4582473B2 (ja) * 2001-07-16 2010-11-17 Ｓｍｃ株式会社 恒温液循環装置
US6694222B1 (en) * 2002-07-26 2004-02-17 Delphi Technologies, Inc. Fuzzy logic control of a variable displacement compressor in a vehicle air conditioning system
ITTO20030792A1 (it) * 2002-10-08 2004-04-09 Danfoss As Dispositivo e procedimento di controllo di una valvola
US6711911B1 (en) * 2002-11-21 2004-03-30 Carrier Corporation Expansion valve control
CA2509207C (en) * 2002-12-09 2012-04-24 Hudson Technologies, Inc. Method and apparatus for optimizing refrigeration systems
US6742347B1 (en) * 2003-01-07 2004-06-01 Carrier Corporation Feedforward control for absorption chiller
US6826917B1 (en) * 2003-08-01 2004-12-07 York International Corporation Initial pull down control for a multiple compressor refrigeration system
US6898945B1 (en) 2003-12-18 2005-05-31 Heatcraft Refrigeration Products, Llc Modular adjustable nozzle and distributor assembly for a refrigeration system
DE102004005802B4 (de) * 2004-02-06 2006-04-20 Lauda Dr. R. Wobser Gmbh & Co. Kg. Verfahren zur Regelung einer Kältemaschine nach dem Verdampferprinzip sowie Anordnung zur Ausübung des Verfahrens
KR100579564B1 (ko) * 2004-04-12 2006-05-15 엘지전자 주식회사 냉동 사이클 장치의 전자 팽창밸브 제어 방법
US6868695B1 (en) * 2004-04-13 2005-03-22 American Standard International Inc. Flow distributor and baffle system for a falling film evaporator
US7621141B2 (en) * 2004-09-22 2009-11-24 York International Corporation Two-zone fuzzy logic liquid level control
JP2008516187A (ja) * 2004-10-13 2008-05-15 ヨーク・インターナショナル・コーポレーション 落下フィルム蒸発器
US8096141B2 (en) * 2005-01-25 2012-01-17 Trane International Inc. Superheat control by pressure ratio
DE102005019146A1 (de) * 2005-04-25 2006-10-26 Emerson Electric Gmbh & Co. Ohg Verfahren zum Betreiben einer Kältemaschine
EP2097687A2 (en) * 2006-12-21 2009-09-09 Johnson Controls Technology Company Falling film evaporator with a hood and a flow distributor
CN101611277B (zh) * 2006-12-21 2011-11-16 开利公司 用于空调系统的自由冷却限制控制
CN101680699B (zh) * 2006-12-28 2012-07-18 开利公司 空调系统的自由冷却能力控制
CN101311851B (zh) * 2007-05-25 2013-05-22 开利公司 用于冷却器电子膨胀阀的修改的模糊控制
US7775057B2 (en) 2007-06-15 2010-08-17 Trane International Inc. Operational limit to avoid liquid refrigerant carryover
US8151583B2 (en) 2007-08-01 2012-04-10 Trane International Inc. Expansion valve control system and method for air conditioning apparatus
EP2232167A1 (en) * 2008-01-11 2010-09-29 Johnson Controls Technology Company Heat exchanger
KR101086215B1 (ko) * 2008-03-07 2011-11-24 알케마 인코포레이티드 개선된 오일 리턴을 갖는 할로겐화 알켄 열 전달 조성물
US8326464B2 (en) * 2008-08-29 2012-12-04 Trane International Inc. Return fan control system and method
WO2010049998A1 (ja) * 2008-10-29 2010-05-06 三菱電機株式会社 空気調和装置及び中継装置
US8132420B2 (en) * 2008-11-07 2012-03-13 Trane International Inc. Variable evaporator water flow compensation for leaving water temperature control
TWI358520B (en) * 2008-12-04 2012-02-21 Ind Tech Res Inst Pressure-adjustable multi-tube spraying device
US8774978B2 (en) 2009-07-23 2014-07-08 Siemens Industry, Inc. Device and method for optimization of chilled water plant system operation
US8417392B2 (en) * 2009-07-23 2013-04-09 Siemens Industry, Inc. Qualification system and method for chilled water plant operations
US8275483B2 (en) 2009-07-23 2012-09-25 Siemens Industry, Inc. Demand flow pumping
EP2459945B1 (en) 2009-07-31 2018-05-02 Johnson Controls Technology Company Refrigeration system and operating method
US8375733B2 (en) * 2009-08-18 2013-02-19 Polyscience Low-noise fan control for refrigeration cycle
US20110056664A1 (en) * 2009-09-08 2011-03-10 Johnson Controls Technology Company Vapor compression system
KR20110097203A (ko) * 2010-02-25 2011-08-31 삼성전자주식회사 히트 펌프 시스템 및 그 제어방법
CN101907198B (zh) * 2010-07-02 2011-12-28 浙江博威汽车空调有限公司 膨胀阀的预压设定装置及其使用方法
US10209013B2 (en) 2010-09-03 2019-02-19 Johnson Controls Technology Company Vapor compression system
US8887518B2 (en) 2010-09-30 2014-11-18 Trane International Inc. Expansion valve control system and method for air conditioning apparatus
JP5629189B2 (ja) * 2010-11-16 2014-11-19 アズビル株式会社 制御装置および方法
US9050360B1 (en) 2010-12-27 2015-06-09 Robert P. Scaringe Apparatus for crankcase pressure regulation using only ambient air or coolant temperature
US10254026B2 (en) 2011-04-21 2019-04-09 Hamilton Sundstrand Corporation Control algorithm for electronic expansion valve modulation
CN103206821B (zh) * 2012-01-11 2016-05-11 江苏江平空调净化设备有限公司 抗摇摆高温氨水液面控制系统
US20130255308A1 (en) * 2012-03-29 2013-10-03 Johnson Controls Technology Company Chiller or heat pump with a falling film evaporator and horizontal oil separator
US10174977B2 (en) 2012-11-21 2019-01-08 Vertiv Corporation Apparatus and method for subcooling control based on superheat setpoint control
US20140137573A1 (en) * 2012-11-21 2014-05-22 Liebert Corporation Expansion Valve Position Control Systems And Methods
US10077929B2 (en) 2013-05-08 2018-09-18 Carrier Corporation Movement of electronic expansion valve
US10169833B2 (en) * 2013-05-14 2019-01-01 University Of Florida Research Foundation, Incorporated Using customer premises to provide ancillary services for a power grid
JP5673738B2 (ja) * 2013-06-11 2015-02-18 ダイキン工業株式会社 空気調和装置
WO2015061271A1 (en) 2013-10-22 2015-04-30 University Of Florida Research Foundation, Inc. Low-frequency ancillary power grid services
WO2015089295A2 (en) 2013-12-12 2015-06-18 University Of Florida Research Foundation, Inc. Comfortable, energy-efficient control of a heating, ventilation, and air conditioning system
KR102242777B1 (ko) * 2014-03-20 2021-04-20 엘지전자 주식회사 공기조화기
ES2926137T3 (es) * 2015-03-09 2022-10-24 Carrier Corp Control de válvula de expansión
US11365921B2 (en) 2015-09-18 2022-06-21 Carrier Corporation System and method of freeze protection for a chiller
KR102488575B1 (ko) 2016-03-11 2023-01-16 한화파워시스템 주식회사 압축기 제어 시스템 및 압축기의 제어 방법
WO2017172950A1 (en) * 2016-03-30 2017-10-05 Johnson Controls Technology Company Liquid detection system
US10502468B2 (en) * 2016-10-05 2019-12-10 Johnson Controls Technology Company Parallel capillary expansion tube systems and methods
US11137164B2 (en) * 2017-05-15 2021-10-05 Carrier Corporation Control systems and methods for heat pump systems
KR102207327B1 (ko) * 2018-05-11 2021-01-25 주식회사 경동나비엔 온도 차를 이용한 온수 사용 판단 방법 및 시스템
TWI667442B (zh) * 2018-08-01 2019-08-01 群光電能科技股份有限公司 閥、膨脹閥及其步進控制方法
WO2022051655A1 (en) * 2020-09-03 2022-03-10 Johnson Controls Tyco IP Holdings LLP Expansion valve control system

Family Cites Families (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2534455A (en) * 1944-06-08 1950-12-19 Honeywell Regulator Co Refrigerating control apparatus
US2590061A (en) * 1949-09-01 1952-03-18 Gen Electric Industrial liquid cooler automatic liquid level control
US3174298A (en) * 1957-03-25 1965-03-23 Phillips Petroleum Co Process controller
US3095255A (en) * 1960-04-25 1963-06-25 Carrier Corp Heat exchange apparatus of the evaporative type
US3250084A (en) * 1963-09-25 1966-05-10 Carrier Corp Control systems
US3600904A (en) * 1969-05-27 1971-08-24 Emerson Electric Co Control for refrigeration system
US3638446A (en) * 1969-06-27 1972-02-01 Robert T Palmer Low ambient control of subcooling control valve
US3735603A (en) * 1971-08-12 1973-05-29 Dunham Bush Inc Liquid refrigerant feed control
JPS55162571A (en) * 1979-06-01 1980-12-17 Toyoda Automatic Loom Works Protection apparatus for refrigerant compressor
JPS55164793A (en) * 1979-06-07 1980-12-22 Toyoda Autom Loom Works Ltd Protecting device for refrigerant compressor
US4689967A (en) * 1985-11-21 1987-09-01 American Standard Inc. Control and method for modulating the capacity of a temperature conditioning system
US5115644A (en) * 1979-07-31 1992-05-26 Alsenz Richard H Method and apparatus for condensing and subcooling refrigerant
SE8006391L (sv) * 1980-09-12 1982-03-13 Jacob Weitman Sett att reglera en vermevexlare
US4463573A (en) * 1980-09-15 1984-08-07 Ford Motor Company Pressure responsive safety control for refrigerant compressor
JPS57207773A (en) * 1981-06-17 1982-12-20 Taiheiyo Kogyo Kk Method of controlling cooling circuit and its control valve
JPS5870078A (ja) * 1981-10-21 1983-04-26 Hitachi Ltd スクリユ圧縮機の監視装置
JPS58120054A (ja) * 1982-01-09 1983-07-16 三菱電機株式会社 空気調和装置
US4612775A (en) * 1984-05-04 1986-09-23 Kysor Industrial Corporation Refrigeration monitor and alarm system
US4536130A (en) * 1984-06-18 1985-08-20 Dunham-Bush, Inc. Simplified unloader indicator for helical screw rotary compressor
US4651535A (en) * 1984-08-08 1987-03-24 Alsenz Richard H Pulse controlled solenoid valve
EP0179625B1 (en) * 1984-10-19 1990-03-07 Nippondenso Co., Ltd. Air conditioner for automobiles
US4621502A (en) * 1985-01-11 1986-11-11 Tyler Refrigeration Corporation Electronic temperature control for refrigeration system
US4610612A (en) * 1985-06-03 1986-09-09 Vilter Manufacturing Corporation Rotary screw gas compressor having dual slide valves
US4715190A (en) * 1985-11-21 1987-12-29 American Standard Inc. Control and method for modulating the capacity of a temperature conditioning system
US4762469A (en) * 1986-03-03 1988-08-09 American Standard Inc. Rotor anti-reverse rotation arrangement in a screw compressor
US4662819A (en) * 1986-04-10 1987-05-05 American Standard Inc. Centrifugal fan with variable blade pitch
US4676870A (en) * 1986-06-02 1987-06-30 Phillips Petroleum Company Automatic control of a multiple-effect evaporator
US4730995A (en) * 1986-09-25 1988-03-15 American Standard Inc. Screw compressor bearing arrangement with positive stop to accommodate thrust reversal
JPH0754207B2 (ja) * 1986-11-25 1995-06-07 日本電装株式会社 冷凍サイクル装置
JP2735188B2 (ja) * 1987-03-20 1998-04-02 株式会社日立製作所 空気調和装置
US5043863A (en) * 1987-03-30 1991-08-27 The Foxboro Company Multivariable adaptive feedforward controller
US4780061A (en) * 1987-08-06 1988-10-25 American Standard Inc. Screw compressor with integral oil cooling
US4928494A (en) * 1988-12-20 1990-05-29 American Standard Inc. Incremental electrically actuated valve
US5011112A (en) * 1988-12-20 1991-04-30 American Standard Inc. Incremental electrically actuated valve
US4986085A (en) * 1989-09-12 1991-01-22 American Standard Inc. Incremental electrically actuated valve
US5058031A (en) * 1990-03-30 1991-10-15 American Standard Inc. Multilevel phase unbalance compressor motor protection system
US5083374A (en) * 1990-04-16 1992-01-28 Miller Ray R Thermally prestressed cylindrical structure and method of making same
US5027608A (en) * 1990-04-20 1991-07-02 American Standard Inc. Method and apparatus for determining full load condition in a screw compressor
US5156013A (en) * 1990-05-29 1992-10-20 Sanyo Electric Co., Ltd. Control device for absorption refrigerator
US5109676A (en) * 1990-07-10 1992-05-05 Sundstrand Corporation Vapor cycle system evaporator control
JP2815991B2 (ja) * 1990-07-30 1998-10-27 三洋電機株式会社 吸収式冷凍機の制御装置
US5009074A (en) * 1990-08-02 1991-04-23 General Motors Corporation Low refrigerant charge protection method for a variable displacement compressor
US5257508A (en) * 1990-09-14 1993-11-02 Nartron Corporation Environmental control system
US5079930A (en) * 1990-12-03 1992-01-14 Atron, Inc. Apparatus and method for monitoring refrigeration system
US5259210A (en) * 1991-01-10 1993-11-09 Sanyo Electric Co., Ltd. Refrigerating apparatus and method of controlling refrigerating apparatus in accordance with fuzzy reasoning
US5083745A (en) * 1991-01-18 1992-01-28 American Standard Inc. Incremental electrically actuated valve
JP2529905B2 (ja) * 1991-06-18 1996-09-04 関東精機株式会社 工作機械の温度制御方法
JPH055564A (ja) * 1991-06-28 1993-01-14 Toshiba Corp 空気調和機
US5211026A (en) * 1991-08-19 1993-05-18 American Standard Inc. Combination lift piston/axial port unloader arrangement for a screw compresser
US5257921A (en) * 1992-05-19 1993-11-02 Fes, Inc. Electronic slide valve position indicator
US5203685A (en) * 1992-06-23 1993-04-20 American Standard Inc. Piston unloader arrangement for screw compressors
US5201648A (en) * 1992-09-01 1993-04-13 American Standard Inc. Screw compressor mechanical oil shutoff arrangement
US5329462A (en) * 1992-12-24 1994-07-12 Carrier Corporation Expansion valve control

Also Published As

Publication number Publication date
EP0811135B1 (en) 2000-03-22
BR9510519A (pt) 1998-07-07
JPH11501114A (ja) 1999-01-26
CN1181805A (zh) 1998-05-13
CA2212804C (en) 2001-05-01
IN186883B (instruction) 2001-12-01
WO1996027108A1 (en) 1996-09-06
CN1161579C (zh) 2004-08-11
EP0811135A1 (en) 1997-12-10
CA2212804A1 (en) 1996-09-06
US5632154A (en) 1997-05-27
DE69515912D1 (de) 2000-04-27
DE69515912T2 (de) 2000-08-03
US5809794A (en) 1998-09-22

Similar Documents

Publication Publication Date Title
AU4522896A (en) Feed forward control of expansion valve
AU5865896A (en) Slope of cut control system
AUPN422295A0 (en) Control system
AU696511B2 (en) Copyright control system
AU4897796A (en) Control for commercial refrigeration system
AU6942196A (en) In-line control valves
AU3304295A (en) Global control of HVAC distribution system
AU7435996A (en) Driver control interface system
AU5867496A (en) Biderctional flow control valve
AU6899696A (en) Improved process-to-mark control system
AU5270196A (en) Hydraulic control arrangement
GB2305265A8 (en) System for simplifying the operation of control functions
EP0750140A3 (en) Gearshift control system
AU6748696A (en) Control means
AU7670396A (en) Expansion valve unit
AUPN360295A0 (en) Blend control system
AU5266893A (en) Expansion valve control
AU7318896A (en) Compounds for control of whitefly
AU4435997A (en) A control system of FIFO memories
AU2611695A (en) Sailboatsystem for controlled gibing
AU4789796A (en) Fire control system
AUPN716795A0 (en) Control of fuelling
AUPN561095A0 (en) Engine control strategy
AU6992996A (en) Flow control means
AU4672596A (en) Controlling a combustion system