EP0719947A3 - Load-sensing circuit - Google Patents

Load-sensing circuit Download PDF

Info

Publication number
EP0719947A3
EP0719947A3 EP95120626A EP95120626A EP0719947A3 EP 0719947 A3 EP0719947 A3 EP 0719947A3 EP 95120626 A EP95120626 A EP 95120626A EP 95120626 A EP95120626 A EP 95120626A EP 0719947 A3 EP0719947 A3 EP 0719947A3
Authority
EP
European Patent Office
Prior art keywords
hydraulic pump
delivery volume
working position
counterforce
volume
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.)
Granted
Application number
EP95120626A
Other languages
German (de)
French (fr)
Other versions
EP0719947A2 (en
EP0719947B1 (en
Inventor
Werner Hörmann
Reinhold Schniederjan
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.)
Brueninghaus Hydromatik GmbH
Original Assignee
Brueninghaus Hydromatik GmbH
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 Brueninghaus Hydromatik GmbH filed Critical Brueninghaus Hydromatik GmbH
Publication of EP0719947A2 publication Critical patent/EP0719947A2/en
Publication of EP0719947A3 publication Critical patent/EP0719947A3/en
Application granted granted Critical
Publication of EP0719947B1 publication Critical patent/EP0719947B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • 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
    • F04B49/08—Regulating by delivery 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
    • 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
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/09—Flow through the 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
    • 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
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/30—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
    • F15B2211/40—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
    • F15B2211/60—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
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle 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
    • F15B2211/605—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
    • F15B2211/67—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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

Die Erfindung betrifft eine Load-Sensing-Schaltung für eine wenigstens einen Verbraucher (2) über mindestens eine Arbeitsleitung (3) antreibende, nullhubgeregelte Hydropumpe (1) verstellbaren Fördervolumens (V), mit einem auf einen Sollwert des Volumenstroms (Q) der Hydropumpe (1) einstellbaren Regelventil (16), dessen Ventilkörper (22) über eine erste Meßfläche (MF1, MF'1) vom Arbeitsdruck (pA) der Hydropumpe (1) gegen eine Gegenkraft (FG) in Richtung einer Arbeitsstellung und über eine zweite Meßfläche (MF2, MF'2) vom Lastdruck (pL) des Verbrauchers (2) gleichsinnig mit der Gegenkraft (FG) in Richtung einer anderen Arbeitsstellung beaufschlagbar ist, wobei das Regelventil (16) in der einen Arbeitsstellung eine Verstellung der Hydropumpe (1) auf kleineres und in der anderen Arbeitsstellung auf größeres Fördervolumen (V) hervorruft. Um mit geringerem konstruktiven Aufwand ein stabileres Betriebsverhalten zu erreichen, ist eine Rückmeldeeinrichtung (17, 36) vorgesehen zur Erzeugung einer dem Volumenstrom (Q) oder dem eingestellten Fördervolumen (V) der Hydropumpe (1) entsprechenden und auf den Ventilkörper (22) wirkenden Rückmeldekraft (FR), die die Beaufschlagung des Ventilkörpers (22) durch die Gegenkraft (FG) und damit die Sollwerteinstellung des Regelventils (16) gegensinnig zu Änderungen des Volumenstroms (Q) bzw. Fördervolumens (V) ändert.

Figure 00000001
The invention relates to a load-sensing circuit for a delivery volume (V) adjustable at least one consumer (2) which drives the zero-stroke-controlled hydraulic pump (1) via at least one working line (3), with a delivery volume (V) which is set to a setpoint value for the volume flow (Q) of the hydraulic pump ( 1) adjustable control valve (16), the valve body (22) via a first measuring surface (MF 1 , MF ' 1 ) of the working pressure (p A ) of the hydraulic pump (1) against a counterforce (F G ) in the direction of a working position and via a second measuring surface (MF 2 , MF ' 2 ) of the load pressure (p L ) of the consumer (2) can be acted upon in the same direction with the counterforce (F G ) in the direction of another working position, the control valve (16) in one working position adjusting the Hydraulic pump (1) to a smaller and in the other working position to a larger delivery volume (V). In order to achieve a more stable operating behavior with less design effort, a feedback device (17, 36) is provided for generating a feedback force corresponding to the volume flow (Q) or the adjusted delivery volume (V) of the hydraulic pump (1) and acting on the valve body (22) (F R ), which changes the action of the valve body (22) by the counterforce (F G ) and thus the setpoint setting of the control valve (16) in the opposite direction to changes in the volume flow (Q) or delivery volume (V).
Figure 00000001
EP95120626A 1994-12-29 1995-12-27 Load-sensing circuit Expired - Lifetime EP0719947B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4447154A DE4447154C2 (en) 1994-12-29 1994-12-29 Load-sensing circuit
DE4447154 1994-12-29

Publications (3)

Publication Number Publication Date
EP0719947A2 EP0719947A2 (en) 1996-07-03
EP0719947A3 true EP0719947A3 (en) 1998-02-11
EP0719947B1 EP0719947B1 (en) 2004-07-21

Family

ID=6537452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95120626A Expired - Lifetime EP0719947B1 (en) 1994-12-29 1995-12-27 Load-sensing circuit

Country Status (2)

Country Link
EP (1) EP0719947B1 (en)
DE (2) DE4447154C2 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19713934B4 (en) 1997-04-04 2004-06-03 Brueninghaus Hydromatik Gmbh Load pressure-controlled flow regulator with flushing circuit
DE10134747B4 (en) * 2001-07-17 2017-05-04 Liebherr-Machines Bulle S.A. Method and device for load-dependent control of the fluid supply of a fluid circuit
DE10209964A1 (en) * 2002-03-06 2003-09-25 Zf Lenksysteme Gmbh System for controlling a hydraulic variable pump
DE102005016181B4 (en) * 2005-04-08 2018-05-09 Robert Bosch Automotive Steering Gmbh Regulating device for a hydraulic conveyor
DE102006002959A1 (en) * 2006-01-21 2007-07-26 Zf Lenksysteme Gmbh Hydraulic system for use in vehicles, has current regulating piston, where height of application of pressure of current regulating piston, for adjustment to pressure is changed, according to flow against lateral pressure
DE102006014074B4 (en) * 2006-03-28 2017-04-06 Robert Bosch Gmbh Dosing system and method for dispensing an additive in an exhaust system of an internal combustion engine
DE102007039589A1 (en) * 2007-08-22 2009-02-26 Voigt, Dieter, Dipl.-Ing. Regular oil pump with adjustment-dependent oil pressure control
DE102008031768A1 (en) * 2008-07-04 2010-01-07 Alpha Fluid Hydrauliksysteme Müller GmbH Regulating arrangement for proportional angle adjustment in driving or lifting units comprises a tension spring connected at its ends directly to the lifting component of a hydraulic linear motor component
DE102012112879B4 (en) 2012-12-21 2014-08-07 Pierburg Gmbh Valve device for a hydraulic circuit and oil pump control arrangement
DE102013216395B4 (en) * 2013-08-19 2019-01-17 Danfoss Power Solutions a.s. CONTROL DEVICE FOR HYDRAULIC ADJUSTING PUMPS AND ADJUSTING PUMP WITH A CONTROL DEVICE

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2910611A1 (en) * 1979-03-17 1980-09-18 Bosch Gmbh Robert HYDRAULIC SYSTEM
DE2913534A1 (en) * 1979-04-04 1980-10-16 Bosch Gmbh Robert Flow and pressure control for variable delivery pump - has flow control valve operated by throttle differential and limited pilot pressure
US4292805A (en) * 1979-09-24 1981-10-06 Rexnord Inc. Servo-valve convertible construction
DE3200885A1 (en) * 1982-01-14 1983-07-21 Robert Bosch Gmbh, 7000 Stuttgart Output regulator for a hydrostatic pump
DE3340332A1 (en) * 1983-11-08 1985-05-23 Hydromatik GmbH, 7915 Elchingen PERFORMANCE CONTROL DEVICE FOR A HYDROSTATIC DRIVE WITH FLOW RATE ADJUSTMENT
DE3805061A1 (en) * 1988-02-18 1989-08-31 Linde Ag HYDRAULIC SWITCHING ARRANGEMENT
EP0586214A1 (en) * 1992-08-31 1994-03-09 Kayaba Industry Co., Ltd. Control device for actuator
GB2291986A (en) * 1994-07-29 1996-02-07 Daewoo Heavy Ind Co Ltd Fluid pressure control system for hydraulic excavators

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2910611A1 (en) * 1979-03-17 1980-09-18 Bosch Gmbh Robert HYDRAULIC SYSTEM
DE2913534A1 (en) * 1979-04-04 1980-10-16 Bosch Gmbh Robert Flow and pressure control for variable delivery pump - has flow control valve operated by throttle differential and limited pilot pressure
US4292805A (en) * 1979-09-24 1981-10-06 Rexnord Inc. Servo-valve convertible construction
DE3200885A1 (en) * 1982-01-14 1983-07-21 Robert Bosch Gmbh, 7000 Stuttgart Output regulator for a hydrostatic pump
DE3340332A1 (en) * 1983-11-08 1985-05-23 Hydromatik GmbH, 7915 Elchingen PERFORMANCE CONTROL DEVICE FOR A HYDROSTATIC DRIVE WITH FLOW RATE ADJUSTMENT
DE3805061A1 (en) * 1988-02-18 1989-08-31 Linde Ag HYDRAULIC SWITCHING ARRANGEMENT
EP0586214A1 (en) * 1992-08-31 1994-03-09 Kayaba Industry Co., Ltd. Control device for actuator
GB2291986A (en) * 1994-07-29 1996-02-07 Daewoo Heavy Ind Co Ltd Fluid pressure control system for hydraulic excavators

Also Published As

Publication number Publication date
EP0719947A2 (en) 1996-07-03
EP0719947B1 (en) 2004-07-21
DE4447154C2 (en) 2002-05-29
DE59510929D1 (en) 2004-08-26
DE4447154A1 (en) 1996-07-11

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