GB201207161D0 - A hydraulic system - Google Patents
A hydraulic systemInfo
- Publication number
- GB201207161D0 GB201207161D0 GBGB1207161.9A GB201207161A GB201207161D0 GB 201207161 D0 GB201207161 D0 GB 201207161D0 GB 201207161 A GB201207161 A GB 201207161A GB 201207161 D0 GB201207161 D0 GB 201207161D0
- Authority
- GB
- United Kingdom
- Prior art keywords
- orifice
- outlet
- amplification
- mode
- ratio
- 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.)
- Withdrawn
Links
- 230000003321 amplification Effects 0.000 abstract 7
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 7
- 239000012530 fluid Substances 0.000 abstract 4
- 238000000034 method Methods 0.000 abstract 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
-
- 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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- 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 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- 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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/168—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load with an isolator valve (duplicating valve), i.e. at least one load sense [LS] pressure is derived from a work port load sense pressure but is not a work port pressure itself
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/25—Pressure control functions
- F15B2211/253—Pressure margin control, e.g. pump pressure in relation to 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
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
-
- 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
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
-
- 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
- F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
-
- 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
- F15B2211/605—Load sensing circuits
- F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
-
- 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
- F15B2211/605—Load sensing circuits
- F15B2211/6058—Load sensing circuits with isolator 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
- F15B2211/60—Circuit components or control therefor
- F15B2211/65—Methods of control of the load sensing pressure
- F15B2211/651—Methods of control of the load sensing pressure characterised by the way the load pressure is communicated to the load sensing circuit
-
- 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
- F15B2211/65—Methods of control of the load sensing pressure
- F15B2211/653—Methods of control of the load sensing pressure the load sensing pressure being higher than the load pressure
Abstract
A method of operating a hydraulic system including providing
a hydraulic pump (32,232,332) having a pump outlet,
a main orifice (43,243A,243B) having a main orifice inlet in fluid communication with the pump outlet and a main orifice outlet for supplying pressurised fluid to a service,
a flow orifice (44,244,344) having a flow orifice inlet for sensing a pressure representative of a pressure at the pump outlet and a flow orifice outlet,
an amplification orifice (45,245,345) having an amplification orifice inlet in fluid communication with the flow orifice outlet and an amplification orifice outlet for sensing a pressure representative of a pressure at a service,
means (63,263,363) for generating an output signal representative of a fluid pressure between the flow orifice outlet and the amplification orifice inlet,
and a pump controller (64,270,395) for controlling the hydraulic pump in response to the output signal,
the flow orifice defining a flow orifice cross section area and
the amplification orifice defining an amplification orifice cross section area,
the flow orifice cross section area and the amplification orifice cross section area defining a ratio,
in which the main orifice is variable and the ratio is variable,
the method further comprising the steps of operating the system in a first mode so as to define a first mode ratio and operating the system in a second mode so as to define a second mode ratio,
so that the ratio is controlled differently in the first mode and the second mode.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1207161.9A GB2501486A (en) | 2012-04-24 | 2012-04-24 | Work machine having a hydraulic system comprising variable orifice ratios |
EP13162367.0A EP2657537A3 (en) | 2012-04-24 | 2013-04-04 | A hydraulic system |
US13/866,757 US20130280097A1 (en) | 2012-04-24 | 2013-04-19 | Hydraulic system |
JP2013089397A JP2013228101A (en) | 2012-04-24 | 2013-04-22 | Hydraulic system |
CN2013101460436A CN103375450A (en) | 2012-04-24 | 2013-04-24 | Hydraulic system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1207161.9A GB2501486A (en) | 2012-04-24 | 2012-04-24 | Work machine having a hydraulic system comprising variable orifice ratios |
Publications (2)
Publication Number | Publication Date |
---|---|
GB201207161D0 true GB201207161D0 (en) | 2012-06-06 |
GB2501486A GB2501486A (en) | 2013-10-30 |
Family
ID=46261777
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1207161.9A Withdrawn GB2501486A (en) | 2012-04-24 | 2012-04-24 | Work machine having a hydraulic system comprising variable orifice ratios |
Country Status (5)
Country | Link |
---|---|
US (1) | US20130280097A1 (en) |
EP (1) | EP2657537A3 (en) |
JP (1) | JP2013228101A (en) |
CN (1) | CN103375450A (en) |
GB (1) | GB2501486A (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9435105B2 (en) * | 2014-05-07 | 2016-09-06 | Deere & Company | Method and system for controlling pump outlet pressure between different operating modes |
WO2016204663A1 (en) | 2015-06-16 | 2016-12-22 | Volvo Construction Equipment Ab | Load sensing hydraulic system for a working machine |
US9662787B1 (en) * | 2015-09-25 | 2017-05-30 | Google Inc. | Hydraulic pressure variation in a legged robot |
US10323458B2 (en) * | 2016-10-21 | 2019-06-18 | Caterpillar Inc. | Dual pressure logic for a track drill circuit |
US11143211B1 (en) | 2021-01-29 | 2021-10-12 | Cnh Industrial America Llc | System and method for controlling hydraulic fluid flow within a work vehicle |
US11261582B1 (en) | 2021-01-29 | 2022-03-01 | Cnh Industrial America Llc | System and method for controlling hydraulic fluid flow within a work vehicle using flow control valves |
US11313388B1 (en) | 2021-01-29 | 2022-04-26 | Cnh Industrial America Llc | System and method for controlling hydraulic fluid flow within a work vehicle |
US11530524B2 (en) | 2021-01-29 | 2022-12-20 | Cnh Industrial America Llc | System and method for controlling hydraulic fluid flow within a work vehicle |
US11921525B1 (en) | 2022-11-25 | 2024-03-05 | Pratt & Whitney Canada Corp. | System and method for controlling fluid flow with a pressure relief valve |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4196588A (en) * | 1978-05-01 | 1980-04-08 | Caterpillar Tractor Co. | Margin valve |
JPS54162353A (en) * | 1978-06-13 | 1979-12-22 | Toshiba Corp | Hydraulic circuit for driving cargo handling apparatus |
DE2906166A1 (en) * | 1979-02-17 | 1980-08-28 | Bosch Gmbh Robert | DEVICE FOR CONTROLLING THE FLOW RATE AND LIMITING THE DELIVERY PRESSURE OF AN ADJUSTABLE PUMP |
US4327627A (en) * | 1980-01-07 | 1982-05-04 | Tadeusz Budzich | Load responsive fluid control valve |
DE3722083C1 (en) * | 1987-07-03 | 1988-09-15 | Heilmeier & Weinlein | Hydraulic control device |
DE3807583C1 (en) * | 1988-03-08 | 1989-03-09 | Heilmeier & Weinlein Fabrik Fuer Oel-Hydraulik Gmbh & Co Kg, 8000 Muenchen, De | |
DE3844401C2 (en) * | 1988-12-30 | 1994-10-06 | Rexroth Mannesmann Gmbh | Control device for a variable displacement pump |
DE4313597B4 (en) * | 1993-04-26 | 2005-09-15 | Linde Ag | Method of operating an adjustable hydrostatic pump and hydrostatic drive system adapted therefor |
US5579642A (en) * | 1995-05-26 | 1996-12-03 | Husco International, Inc. | Pressure compensating hydraulic control system |
US5809862A (en) * | 1995-08-04 | 1998-09-22 | Dallman; Jimmie J. | Flotation control system |
US6033188A (en) * | 1998-02-27 | 2000-03-07 | Sauer Inc. | Means and method for varying margin pressure as a function of pump displacement in a pump with load sensing control |
GB2352275B (en) * | 1999-07-17 | 2004-02-18 | Agco Gmbh & Co | Hydraulic system for utility vehicles |
JP4128482B2 (en) * | 2002-04-30 | 2008-07-30 | 東芝機械株式会社 | Hydraulic control system |
US6662558B1 (en) * | 2002-07-02 | 2003-12-16 | Caterpillar Inc | Variable delivery control arrangement for a pump |
US6874318B1 (en) * | 2003-09-18 | 2005-04-05 | Sauer-Danfoss, Inc. | Automatic remote pressure compensation in an open circuit pump |
US7204185B2 (en) * | 2005-04-29 | 2007-04-17 | Caterpillar Inc | Hydraulic system having a pressure compensator |
GB2436856A (en) * | 2006-04-07 | 2007-10-10 | Agco Gmbh | Pressure control for system with primary and secondary consumers |
US8478504B2 (en) * | 2008-10-23 | 2013-07-02 | Volvo Compact Equipment Sas | Skid steer machine with automatic operating ratio change system |
SE534002C2 (en) * | 2009-06-24 | 2011-03-29 | Nordhydraulic Ab | Method and apparatus for controlling a hydraulic system |
GB0912540D0 (en) * | 2009-07-20 | 2009-08-26 | Bamford Excavators Ltd | Hydraulic system |
CN201553113U (en) * | 2009-08-27 | 2010-08-18 | 天津建筑机械厂 | Hydraulic system for crawler traction engines |
JP2011075048A (en) * | 2009-09-30 | 2011-04-14 | Hitachi Constr Mach Co Ltd | Hydraulic driving device for hydraulic construction machine |
DE102009049548A1 (en) * | 2009-10-16 | 2011-04-21 | Hydac Fluidtechnik Gmbh | valve assembly |
JP2013531753A (en) * | 2010-07-06 | 2013-08-08 | ボルボ コンストラクション イクイップメント アーベー | Horsepower control system and control method for hybrid excavator |
-
2012
- 2012-04-24 GB GB1207161.9A patent/GB2501486A/en not_active Withdrawn
-
2013
- 2013-04-04 EP EP13162367.0A patent/EP2657537A3/en not_active Withdrawn
- 2013-04-19 US US13/866,757 patent/US20130280097A1/en not_active Abandoned
- 2013-04-22 JP JP2013089397A patent/JP2013228101A/en active Pending
- 2013-04-24 CN CN2013101460436A patent/CN103375450A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JP2013228101A (en) | 2013-11-07 |
EP2657537A2 (en) | 2013-10-30 |
EP2657537A3 (en) | 2016-03-09 |
CN103375450A (en) | 2013-10-30 |
US20130280097A1 (en) | 2013-10-24 |
GB2501486A (en) | 2013-10-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |