EP0746690B1 - Regeleinrichtung für eine hydropumpe - Google Patents
Regeleinrichtung für eine hydropumpe Download PDFInfo
- Publication number
- EP0746690B1 EP0746690B1 EP95909750A EP95909750A EP0746690B1 EP 0746690 B1 EP0746690 B1 EP 0746690B1 EP 95909750 A EP95909750 A EP 95909750A EP 95909750 A EP95909750 A EP 95909750A EP 0746690 B1 EP0746690 B1 EP 0746690B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- control
- control valve
- pump
- port
- 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 - Lifetime
Links
Images
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
- F15B11/16—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
- 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
- F15B2211/30—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
- F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/31505—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and a return line
- F15B2211/31511—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and a return line having a single pressure source
-
- 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
- F15B2211/30—Directional control
- F15B2211/355—Pilot 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
- F15B2211/605—Load sensing circuits
-
- 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
Definitions
- the invention relates to a control device for a hydraulic pump.
- the hydraulic pump which is a hydraulic adjustment device has, for supplying pressure medium to a first hydraulic consumer demand-controlled and for pressure medium supply of a second hydraulic consumer pressure-controlled be adjustable, the latter being the regulated one Pressure and setting one of the second hydraulic Control valve assigned to consumers together by a control signal can be specified.
- the demand flow control of a hydraulic variable pump is also known as load sensing control. Characteristic of this type of regulation is that the pump pressure is around a certain ⁇ p above the highest load pressure of all in this type and hydraulic consumers controlled in parallel lies. The pump pressure drops over a to the consumer with the adjustable orifice assigned to the highest load pressure the load pressure. Depending on the opening cross section of the panel the amount of fluid delivered by the pump is larger or smaller to maintain the specified pressure difference.
- a control valve that in the direction Larger stroke volume from the highest load pressure and from a spring and acted upon by pump pressure in the direction of small stroke volume is.
- From DE 43 08 004 Al is a regulation for an adjustable Known hydraulic pump, which is a pressure control.
- the control signal can e.g. a Control pressure, which is set with the help of a pilot control device is and on the slide of the control valve and on the control piston of a control valve assigned to the variable displacement pump acts in the direction of larger displacement.
- Towards the smaller one Stroke volume may on the control piston of the control valve Pump pressure act, with a difference in size of the pressurized surfaces a control position of the control piston is possible.
- the control pressure can also be adjusted using a Copy valve are raised to the level of the pump pressure so that it is possible to apply the same size to the control piston are.
- a regulation according to DE 43 08 004 A1 a certain pump pressure is adjusted and the spool one Control valve placed in a certain position in which the Control valve can also be open. Is the default Pump pressure less than that required to move the consumer Pressure, so the consumer remains despite the open control valve in peace. Only if by increasing the control signal the pump pressure reaches the load pressure, the consumer catches to move on. So the beginning of this movement is with a larger opening cross-section of the control valve, the higher the load.
- the aim of the invention is for a hydraulic pump that regulates the demand flow and adjustable under pressure, a control device to create, for which dispenses with a shuttle valve can be.
- control device first control valve for the demand flow control and a second Control valve for pressure control includes and that the adjustment device is controllable by the control valve, the Control position according to the level of the control signal and Load pressure requires the higher pump pressure.
- a hydraulic variable displacement pump 10 can have pressure medium Aspirate from a tank 11 and into a pressure line 12 submit.
- the first hydraulic consumers are via this line 13 load sensing regulated and second hydraulic consumer 14 can be moved under pressure control.
- the variable displacement pump 10 has an adjusting device 15 in the form of a hydraulic cylinder, the piston by acting on a piston-side pressure chamber 16 Pressure against the force of a spring 17 in the direction of a decrease of the stroke volume of the pump can be shifted. At a Relief of pressure in the pressure chamber, the spring 17 in the piston Push back in order to increase the stroke volume.
- the adjusting device 15 is operated by several control valves 18, 19 and 20 controlled, all designed as a 3/2-way directional valve are and each have an axially movable control piston. All control pistons are in one axial direction in each case one control line 21 from the one prevailing in the pressure line 12 Pump pressure can be applied.
- the control piston of the first control valve 18 is in the opposite Direction via a control line 22 from the highest to the just actuated first consumer 13 occurring load pressure actable.
- a compression spring acts in the same direction 23, the bias of which is dimensioned such that an equilibrium of forces then occurs prevails on the control piston of the valve 18 when the Pump pressure is 10 to 20 bar higher than the highest load pressure.
- An outlet of the control valve 18 becomes overweight of the pump pressure connected to an input which is connected to the Output of the second control valve 19 is connected.
- At a Overweight of the load pressure in connection with the force of the spring 23 is the output directly bypassing the control valve 19 a tank line 24 connected.
- the control piston of the control valve 19 is counter to the pump pressure can be acted upon by a control pressure via a control line 25, e.g. from one that works on the basis of pressure reducing valves Pilot control device can be specified. While at Control valve 18 acted upon by the pump pressure or the load pressure Differentiate areas of the control piston the pressure areas on the control piston of the control valve 19, since the Control pressure is generally much lower than the pump pressure is.
- the area on which the control pressure acts can e.g. be ten times the size of the other area, so that one opposite the pump pressure ten times smaller control pressure an equilibrium of forces manufactured on the control piston of the control valve 19 can be.
- a maximum system pressure can be set.
- the control piston of this valve is counteracted the pump pressure is acted upon by an adjustable compression spring 35, the valve in below the maximum system pressure holds a position in which the pressure chamber 16 with the exit of the Control valve 18 is connected.
- the valve 20 connects the pressure chamber 16 with the Pressure line 12.
- the pressure chamber 16 When the pump is switched off, the pressure chamber 16 is above the valves 20 and 18, but also in a connection between the Pressure chamber 16 and the tank line 24 lying nozzle 36 for Tank line 24 relieved.
- the pump 10 is therefore at maximum Stroke volume set. If it is now switched on, build in the pressure line 12 even in the absence of signals in the Lines 22 and 25 a pressure on the control piston of the valve 18 adjusted so that the pressure chamber 16 via the three control valves is connected to the pressure line 12 and the pump 10 swings back.
- Such a pump pressure regulates itself that on the control piston of the valve 18 a balance of forces between the force generated by the pump pressure and the force of the spring 23 prevails. The amount of pressure is therefore depending on the preload the spring 23 10 to 20 bar.
- a pressure signal is now given to the control line 25, then changes in the state of the control valves and the adjustment device as long as nothing, as long as this control pressure is a pump pressure corresponds to that already below due to the signal in the Control line 22 reached pump pressure.
- the control pressure increases in the control line 25 via a value that corresponds to the current Pump pressure corresponds to that with the control valve 18 connected output of the control valve 19 with the Tank line 24 connected.
- the pressure chamber 16 is relieved of pressure, so that the pump 10 swings out and the pressure in the pressure line 12 over the pressure corresponding to the control line 22 Pressure rises to such a level that in the control position of the control piston of the control valve 19 on the control piston Force balance between the force generated by the pump pressure and the force generated by the control pressure in the control line 25 is made.
- the higher pump pressure moves the control piston of the control valve 18 so that its output with the output of the control valve 19 is connected, so that now only that Control valve 19 regulates.
- the adjusting device 15 is thus provided that the pressure in the Control line 25 requires a higher pump pressure than that Pressure in the control line 22, solely from the control valve 19 and, provided the pressure in the control line 22 is a higher pump pressure required as the pressure in the control line 25, alone controlled by the control valve 18.
Description
Claims (4)
- Regeleinrichtung für eine Hydropumpe (10), die eine hydraulische Verstelleinrichtung (15) aufweist und die zur Druckmittelversorgung eines ersten hydraulischen Verbrauchers (13) bedarfsstromgeregelt und zur Druckmittelversorgung eines zweiten hydraulischen Verbrauchers (14) druckgeregelt ist, wobei der eingeregelte Druck und die Einstellung eines dem zweiten hydraulischen Verbraucher (14) zugeordneten Steuerventils gemeinsam durch ein Steuersignal vorgebbar sind, gekennzeichnet durch ein erstes Regelventil (18), das in Richtung größeres Hubvolumen der Hydropumpe (10) vom Lastdruck des ersten Verbrauchers (13) und von einer Feder (23) und in Richtung kleineres Hubvolumen vom Pumpendruck beaufschlagbar ist, und durch ein zweites Regelventil (19), das in Richtung größeres Hubvolumen von einer dem Steuersignal entsprechenden Kraft und in Richtung kleineres Hubvolumen vom Pumpendruck beaufschlagbar ist, wobei die Verstelleinrichtung (15) jeweils von dem Regelventil (18, 19) steuerbar ist, dessen Regelstellung entsprechend der Höhe des Steuersignals und des Lastdrucks den höheren Pumpendruck erfordert.
- Regeleinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das eine Regelventil (19) über das andere Regelventil (18) mit der Verstelleinrichtung (15) und letzteres Regelventil (18) über ersteres Regelventil (19) mit der Druckseite (12) der Hydropumpe (10) verbindbar ist.
- Regeleinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein Anschluß des ersten Regelventils (18) unabhängig vom zweiten Regelventil (19) und ein Anschluß des zweiten Regelventils (19) unabhängig vom ersten Regelventil (18) mit einem Tank (11) verbunden ist.
- Regeleinrichtung nach den Ansprüchen 3 und 4, dadurch gekennzeichnet, daß beide Regelventile (18, 19) 3/2-Stetig-Wegeventile sind, daß ein mit der Verstelleinrichtung (15) verbundener Anschluß des einen Regelventils (18) wechselweise mit einem an den Tank angeschlossenen Anschluß oder mit einem mit einem Anschluß des anderen Regelventils (19) verbundenen Anschluß des einen Regelventils (18) verbindbar ist und daß der mit dem einen Anschluß des einen Regelventils (18) verbundene Anschluß des an; deren Regelventils (19) wechselweise mit einem an den Tank (11) angeschlossenen Anschluß oder mit einem mit der Druckseite (12) der Hydropumpe (10) verbundenen Anschluß des anderen Regelventils (19) verbindbar ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4406318A DE4406318A1 (de) | 1994-02-26 | 1994-02-26 | Regeleinrichtung für eine Hydropumpe |
DE4406318 | 1994-02-26 | ||
PCT/EP1995/000611 WO1995023292A1 (de) | 1994-02-26 | 1995-02-21 | Regeleinrichtung für eine hydropumpe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0746690A1 EP0746690A1 (de) | 1996-12-11 |
EP0746690B1 true EP0746690B1 (de) | 1999-01-13 |
Family
ID=6511292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95909750A Expired - Lifetime EP0746690B1 (de) | 1994-02-26 | 1995-02-21 | Regeleinrichtung für eine hydropumpe |
Country Status (5)
Country | Link |
---|---|
US (1) | US5720168A (de) |
EP (1) | EP0746690B1 (de) |
JP (1) | JPH09510002A (de) |
DE (2) | DE4406318A1 (de) |
WO (1) | WO1995023292A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016000186A1 (de) * | 2016-01-11 | 2017-07-13 | Liebherr-Hydraulikbagger Gmbh | Vorrichtung zur regelbaren Hydraulikversorgung unterschiedlich geregelter hydraulischer Verbraucher sowie Hydrauliksystem und Arbeitsmaschine |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6450146B1 (en) | 2000-12-12 | 2002-09-17 | International Engine Intellectual Property Company, L.L.C. | High pressure pump with a close-mounted valve for a hydraulic fuel system |
DE102007051525B4 (de) * | 2007-10-29 | 2011-02-24 | Sauer-Danfoss Gmbh & Co Ohg | Hydraulisches Versorgungssystem mit einer Verstellpumpeneinrichtung |
EP2686561A1 (de) * | 2011-03-17 | 2014-01-22 | Parker-Hannificn Corporation | Elektrohydraulisches system zur steuerung mehrerer funktionen |
CN107061394B (zh) * | 2016-11-22 | 2018-10-23 | 宣城托新精密科技有限公司 | 可调压力敏感度的电液控制机构 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5659003A (en) * | 1979-10-22 | 1981-05-22 | Kawasaki Heavy Ind Ltd | Oil pressure controller |
JPS5740102A (en) * | 1980-08-21 | 1982-03-05 | Hitachi Constr Mach Co Ltd | Control process for inertial mass driver |
JP2631125B2 (ja) * | 1988-04-27 | 1997-07-16 | 東芝機械株式会社 | 負荷圧補償ポンプ吐出流量制御回路 |
DE3901207C2 (de) * | 1989-01-17 | 1994-06-23 | Rexroth Mannesmann Gmbh | Ventilanordnung für mehrere hydraulische Antriebe, insbesondere für die Antriebe eines Krans |
JPH04136507A (ja) * | 1990-09-28 | 1992-05-11 | Komatsu Ltd | 油圧回路 |
JP3003958B2 (ja) * | 1991-03-15 | 2000-01-31 | 株式会社小松製作所 | ロードセンシング油圧回路 |
DE4127342C2 (de) * | 1991-08-19 | 1995-02-16 | Danfoss As | Hydraulisches System mit einer Pumpe |
DE4210252C1 (de) * | 1992-03-28 | 1993-09-02 | O & K Orenstein & Koppel Ag, 13581 Berlin, De | |
DE4308004C2 (de) * | 1992-04-04 | 2000-10-12 | Mannesmann Rexroth Ag | Hydraulische Steuereinrichtung für mehrere Verbraucher |
EP0564939B1 (de) * | 1992-04-04 | 1995-12-13 | Mannesmann Rexroth AG | Hydraulische Steuereinrichtung für mehrere Verbraucher |
-
1994
- 1994-02-26 DE DE4406318A patent/DE4406318A1/de not_active Withdrawn
-
1995
- 1995-02-21 US US08/693,148 patent/US5720168A/en not_active Expired - Fee Related
- 1995-02-21 DE DE59504821T patent/DE59504821D1/de not_active Expired - Fee Related
- 1995-02-21 EP EP95909750A patent/EP0746690B1/de not_active Expired - Lifetime
- 1995-02-21 JP JP7522115A patent/JPH09510002A/ja active Pending
- 1995-02-21 WO PCT/EP1995/000611 patent/WO1995023292A1/de active IP Right Grant
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016000186A1 (de) * | 2016-01-11 | 2017-07-13 | Liebherr-Hydraulikbagger Gmbh | Vorrichtung zur regelbaren Hydraulikversorgung unterschiedlich geregelter hydraulischer Verbraucher sowie Hydrauliksystem und Arbeitsmaschine |
Also Published As
Publication number | Publication date |
---|---|
JPH09510002A (ja) | 1997-10-07 |
US5720168A (en) | 1998-02-24 |
WO1995023292A1 (de) | 1995-08-31 |
DE59504821D1 (de) | 1999-02-25 |
EP0746690A1 (de) | 1996-12-11 |
DE4406318A1 (de) | 1995-08-31 |
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