GB1462879A - Hydraulic actuator controls - Google Patents

Hydraulic actuator controls

Info

Publication number
GB1462879A
GB1462879A GB4721373A GB4721373A GB1462879A GB 1462879 A GB1462879 A GB 1462879A GB 4721373 A GB4721373 A GB 4721373A GB 4721373 A GB4721373 A GB 4721373A GB 1462879 A GB1462879 A GB 1462879A
Authority
GB
United Kingdom
Prior art keywords
signal
actuator
flow
potentiometer
discriminator
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.)
Expired
Application number
GB4721373A
Other languages
English (en)
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.)
Unisys Group Services Ltd
Original Assignee
Sperry Rand Ltd
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 Sperry Rand Ltd filed Critical Sperry Rand Ltd
Priority to GB4721373A priority Critical patent/GB1462879A/en
Priority to US05/511,739 priority patent/US4031813A/en
Priority to DE2447858A priority patent/DE2447858C3/de
Priority to FR7433828A priority patent/FR2247632B1/fr
Priority to JP49115725A priority patent/JPS50111486A/ja
Priority to SE7412672A priority patent/SE411935B/xx
Priority to IT28286/74A priority patent/IT1022765B/it
Publication of GB1462879A publication Critical patent/GB1462879A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action ; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or the actuating force of an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/632—Electronic controllers using input signals representing a flow rate
    • F15B2211/6323—Electronic controllers using input signals representing a flow rate the flow rate being a pressure source flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/632—Electronic controllers using input signals representing a flow rate
    • F15B2211/6326—Electronic controllers using input signals representing a flow rate the flow rate being an output member flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6653—Pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6654—Flow rate control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/67—Methods for controlling pilot pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y10T137/86614—Electric

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Servomotors (AREA)
  • Fluid-Pressure Circuits (AREA)
GB4721373A 1973-10-10 1973-10-10 Hydraulic actuator controls Expired GB1462879A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB4721373A GB1462879A (en) 1973-10-10 1973-10-10 Hydraulic actuator controls
US05/511,739 US4031813A (en) 1973-10-10 1974-10-03 Hydraulic actuator controls
DE2447858A DE2447858C3 (de) 1973-10-10 1974-10-08 Servo-Ventileinrichtung
FR7433828A FR2247632B1 (enExample) 1973-10-10 1974-10-08
JP49115725A JPS50111486A (enExample) 1973-10-10 1974-10-09
SE7412672A SE411935B (sv) 1973-10-10 1974-10-09 Anordning for reglering av fluidumflode till en hydraulisk paverkare.
IT28286/74A IT1022765B (it) 1973-10-10 1974-10-10 Perfezionamenti riguardanti i dispositivi di controllo per9attuatori idraulici

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4721373A GB1462879A (en) 1973-10-10 1973-10-10 Hydraulic actuator controls

Publications (1)

Publication Number Publication Date
GB1462879A true GB1462879A (en) 1977-01-26

Family

ID=10444167

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4721373A Expired GB1462879A (en) 1973-10-10 1973-10-10 Hydraulic actuator controls

Country Status (7)

Country Link
US (1) US4031813A (enExample)
JP (1) JPS50111486A (enExample)
DE (1) DE2447858C3 (enExample)
FR (1) FR2247632B1 (enExample)
GB (1) GB1462879A (enExample)
IT (1) IT1022765B (enExample)
SE (1) SE411935B (enExample)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2921342A1 (de) * 1978-05-26 1979-11-29 Thomson Csf Elektrohydraulische servosteuerung fuer eine belastung, die eine veraenderliche unwucht aufweist
EP0010860A1 (en) * 1978-09-28 1980-05-14 Eaton Corporation Load sensing control for hydraulic system
DE3027480A1 (de) * 1979-08-02 1981-02-19 Werkzeugmasch Okt Veb Hydraulischer telemotor-reversierantrieb
DE2937998A1 (de) * 1979-09-20 1981-04-02 Beche & Grohs GmbH, 5609 Hückeswagen Verfahren zur steuerung des arbeitsablaufes einer druckmittelbeaufschlagten arbeitsmaschine sowie druckmittelbeauschlagte arbeitsmaschine mit druckmittelsteuerung
EP0021742A3 (en) * 1979-06-15 1981-05-27 Sperry Corporation Improvements in or relating to hydraulic actuator controls
EP0070957A1 (de) * 1981-07-15 1983-02-09 Carl Schenck Ag Verfahren und Anordnung zur Nachbildung eines definierten zeitlichen Bewegungsablaufs mit einer servohydraulischen Einrichtung
EP0098719A3 (en) * 1982-07-02 1984-08-01 Sperry Corporation Hydraulic valves with dual feedback control
US4598626A (en) * 1981-08-21 1986-07-08 Vickers, Incorporated Feedback controlled hydraulic valve system
GB2174825A (en) * 1985-05-07 1986-11-12 Sundstrand Corp Hydraulic power drive unit control
FR2611001A1 (fr) * 1987-02-12 1988-08-19 Schoen Hans Dispositif de commande electrohydraulique pour commander un element d'entrainement hydraulique, notamment un verin de presse
CN112904225A (zh) * 2021-01-05 2021-06-04 珠海格力电器股份有限公司 执行器的故障检测系统

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DE2658928A1 (de) * 1976-12-24 1978-07-06 Beringer Hydraulik Gmbh Hydraulische steuerung
DE2661086C2 (enExample) * 1976-12-24 1992-10-15 Beringer-Hydraulik Gmbh, Neuheim, Zug, Ch
US4074529A (en) * 1977-01-04 1978-02-21 Tadeusz Budzich Load responsive system pump controls
US4275793A (en) * 1977-02-14 1981-06-30 Ingersoll-Rand Company Automatic control system for rock drills
DE2707630A1 (de) * 1977-02-23 1978-08-24 Orenstein & Koppel Ag Elektronisch gesteuerte rohrbruchsicherung
DE2754878A1 (de) * 1977-12-09 1979-06-13 Rexroth Gmbh G L Lastunabhaengig arbeitendes elektrisch ansteuerbares wegeventil
US4336745A (en) * 1978-07-31 1982-06-29 Mts Systems Corporation Servovalve flow linearization circuit
IT1119444B (it) * 1979-10-30 1986-03-10 Fiat Ricerche Distributore idraulico
JPS56122774A (en) * 1980-02-26 1981-09-26 Oirudoraibu Kogyo Kk Oil pressure elevator
EP0038128A1 (en) * 1980-04-04 1981-10-21 General Signal Corporation Electro-hydraulic servo activator system
SE432221B (sv) 1980-06-30 1984-03-26 Karlstad Mekaniska Ab Anordning for kombinerad leges- och hastighetsreglering av ett hydrauliskt manovrerat pressbord
ZA825477B (en) * 1981-08-21 1983-06-29 Sperry Corp Hydraulic control system
JPS59117905A (ja) * 1982-12-22 1984-07-07 Hitachi Ltd 油圧サ−ボ機構
FR2575688B2 (fr) * 1984-10-12 1989-11-24 Mors Dispositif porte-pieces a usiner a commande de verin individualisee pour fonctionner a une pression independante
DE3474527D1 (en) * 1983-11-25 1988-11-17 Mors Work pallet, provided with a control system and preferably with a separate cylinder control, to operate with an independent pressure
AT384899B (de) * 1984-09-17 1988-01-25 Hoerbiger Ventilwerke Ag Regelungsverfahren fuer einen fluidzylinder
US4762306A (en) * 1984-12-19 1988-08-09 Mazda Motor Corporation Hydraulic mounting system for a power unit
US4840111A (en) * 1986-01-31 1989-06-20 Moog Inc. Energy-conserving regenerative-flow valves for hydraulic servomotors
GB8615427D0 (en) * 1986-06-24 1986-07-30 Lotus Group Plc Servovalves
DE3734955A1 (de) * 1987-10-15 1989-04-27 Rexroth Mannesmann Gmbh Elektrische messwertaufbereitung fuer ein regelventil
DE3741425C3 (de) * 1987-12-08 1997-12-04 Mannesmann Ag Linearantrieb
FI84292C (fi) * 1988-01-13 1991-11-11 Rexroth Oy Styrsystem i hydrauliskt manoeverorgan.
US5056561A (en) * 1990-02-08 1991-10-15 Byers James O Remote controlled, individually pressure compensated valve
US5261234A (en) * 1992-01-07 1993-11-16 Caterpillar Inc. Hydraulic control apparatus
US5500580A (en) * 1994-09-19 1996-03-19 Hr Textron Inc. Integrated compliance servovalve
US6357334B1 (en) * 1999-08-31 2002-03-19 Tymac Controls Corporation Method and apparatus for the control of a die casting or similar machine
US6286412B1 (en) * 1999-11-22 2001-09-11 Caterpillar Inc. Method and system for electrohydraulic valve control
US20010037689A1 (en) * 2000-03-08 2001-11-08 Krouth Terrance F. Hydraulic actuator piston measurement apparatus and method
AU2001241641A1 (en) * 2000-03-08 2001-09-17 Rosemount, Inc. Piston position measuring device
US20010037724A1 (en) * 2000-03-08 2001-11-08 Schumacher Mark S. System for controlling hydraulic actuator
DE60112266T2 (de) 2000-03-08 2006-06-08 Rosemount Inc., Eden Prairie Bidirektionaler differenzdruck- durchflusssensor
US6588313B2 (en) 2001-05-16 2003-07-08 Rosemont Inc. Hydraulic piston position sensor
DE102006006585B3 (de) * 2006-02-13 2007-10-18 Samson Ag Wandler eines elektrischen Eingangssignals in ein pneumatisches Ausgangssignal
CN100590324C (zh) * 2006-10-16 2010-02-17 太原理工大学 先导比例方向节流阀
WO2010022746A1 (en) * 2008-08-26 2010-03-04 Navalimpianti S.P.A. Measuring device for the measure of the position of fluid-driven actuators with regulation
CN103775441B (zh) * 2014-01-26 2015-11-18 天津大学 双电机驱动的电反馈大型伺服液压缸
CN107076173B (zh) * 2014-08-14 2019-11-15 费斯托股份有限两合公司 促动器控制器以及用于控制促动器的运动的方法
US10227951B2 (en) 2017-02-02 2019-03-12 Woodward, Inc. Limited flow thrust reverser actuating
US11105347B2 (en) 2017-07-20 2021-08-31 Eaton Intelligent Power Limited Load-dependent hydraulic fluid flow control system
US20260085494A1 (en) * 2024-09-20 2026-03-26 Deere & Company Method and system for hydraulic flow control of automation systems for work implements of work machines

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US3282168A (en) 1963-09-05 1966-11-01 Sanders Associates Inc Hydraulic servo control systems
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DE1806775B2 (de) * 1968-11-02 1971-11-11 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Durchflussmessgeraet
US3589387A (en) * 1969-08-22 1971-06-29 Int Basic Economy Corp Integrated manifold circuits and method of assembly
US3686557A (en) * 1970-08-26 1972-08-22 Fischer & Porter Co Floating-type electronic servo-motor process controller
CA943040A (en) * 1970-10-06 1974-03-05 Ronald B. Walters Hydraulic actuator controls
US3727520A (en) * 1970-11-06 1973-04-17 Sperry Rand Corp Digital electrohydraulic servo system
DE2101491A1 (de) * 1971-01-14 1972-07-20 Metz Gmbh Carl Vorrichtung zur Steuerung der Bewegungsabläufe von ausfahrbaren Leitern, Masten oder dergleichen
US3741073A (en) * 1971-01-29 1973-06-26 Moog Inc Hysteretic equalization in redundant electrically operated fluid powered servopositioning apparatus
US3751940A (en) * 1971-09-17 1973-08-14 Borg Warner Refrigeration system prv motor control system
GB1400007A (en) * 1971-10-05 1975-07-16 Lucas Acrospace Ltd Electro-hydraulic actuator arrangement
BE789975A (fr) * 1971-10-12 1973-02-01 Sanders Associates Inc Valve de controle de pression et de debit
US3782250A (en) * 1971-11-03 1974-01-01 Microdot Inc Control system
GB1406326A (en) * 1972-11-08 1975-09-17 Sperry Rand Ltd Hydraulic actuator controls disazo pigment
US3870931A (en) * 1974-02-04 1975-03-11 Sun Chemical Corp Solenoid servomechanism
US3895287A (en) * 1974-05-30 1975-07-15 Westinghouse Electric Corp Low cost voltage regulating relay

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2921342A1 (de) * 1978-05-26 1979-11-29 Thomson Csf Elektrohydraulische servosteuerung fuer eine belastung, die eine veraenderliche unwucht aufweist
EP0010860A1 (en) * 1978-09-28 1980-05-14 Eaton Corporation Load sensing control for hydraulic system
EP0021742A3 (en) * 1979-06-15 1981-05-27 Sperry Corporation Improvements in or relating to hydraulic actuator controls
DE3027480A1 (de) * 1979-08-02 1981-02-19 Werkzeugmasch Okt Veb Hydraulischer telemotor-reversierantrieb
DE2937998A1 (de) * 1979-09-20 1981-04-02 Beche & Grohs GmbH, 5609 Hückeswagen Verfahren zur steuerung des arbeitsablaufes einer druckmittelbeaufschlagten arbeitsmaschine sowie druckmittelbeauschlagte arbeitsmaschine mit druckmittelsteuerung
EP0070957A1 (de) * 1981-07-15 1983-02-09 Carl Schenck Ag Verfahren und Anordnung zur Nachbildung eines definierten zeitlichen Bewegungsablaufs mit einer servohydraulischen Einrichtung
US4598626A (en) * 1981-08-21 1986-07-08 Vickers, Incorporated Feedback controlled hydraulic valve system
EP0098719A3 (en) * 1982-07-02 1984-08-01 Sperry Corporation Hydraulic valves with dual feedback control
GB2174825A (en) * 1985-05-07 1986-11-12 Sundstrand Corp Hydraulic power drive unit control
FR2611001A1 (fr) * 1987-02-12 1988-08-19 Schoen Hans Dispositif de commande electrohydraulique pour commander un element d'entrainement hydraulique, notamment un verin de presse
CN112904225A (zh) * 2021-01-05 2021-06-04 珠海格力电器股份有限公司 执行器的故障检测系统
CN112904225B (zh) * 2021-01-05 2021-12-03 珠海格力电器股份有限公司 执行器的故障检测系统

Also Published As

Publication number Publication date
IT1022765B (it) 1978-04-20
JPS50111486A (enExample) 1975-09-02
DE2447858C3 (de) 1982-11-04
DE2447858B2 (de) 1981-01-15
FR2247632B1 (enExample) 1980-03-14
FR2247632A1 (enExample) 1975-05-09
US4031813A (en) 1977-06-28
SE7412672L (enExample) 1975-04-11
DE2447858A1 (de) 1975-04-17
SE411935B (sv) 1980-02-11

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee