EP0746690A1 - Hydraulic pump control system - Google Patents

Hydraulic pump control system

Info

Publication number
EP0746690A1
EP0746690A1 EP95909750A EP95909750A EP0746690A1 EP 0746690 A1 EP0746690 A1 EP 0746690A1 EP 95909750 A EP95909750 A EP 95909750A EP 95909750 A EP95909750 A EP 95909750A EP 0746690 A1 EP0746690 A1 EP 0746690A1
Authority
EP
European Patent Office
Prior art keywords
pressure
control
control valve
pump
connection
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
EP95909750A
Other languages
German (de)
French (fr)
Other versions
EP0746690B1 (en
Inventor
Edwin Harnischfeger
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.)
Bosch Rexroth AG
Original Assignee
Mannesmann Rexroth AG
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 Mannesmann Rexroth AG filed Critical Mannesmann Rexroth AG
Publication of EP0746690A1 publication Critical patent/EP0746690A1/en
Application granted granted Critical
Publication of EP0746690B1 publication Critical patent/EP0746690B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B11/16—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 has a hydraulic adjustment device, should be demand-flow-controlled for supplying pressure medium to a first hydraulic consumer and should be adjustable in pressure-controlled manner for supplying pressure medium to a second hydraulic consumer, in the latter case the apply pressure and the setting of a control valve assigned to the second hydraulic consumer can be predetermined jointly by a control signal.
  • the demand flow control of a hydraulic variable displacement pump is also referred to as load sensing control. It is characteristic of this type of control that the pump pressure is a certain ⁇ p above the highest load pressure of all hydraulic consumers controlled in this way and in parallel to one another.
  • the pump pressure drops to the load pressure via an adjustable orifice assigned to the consumer with the highest load pressure in each case.
  • the amount of fluid delivered by the pump must be larger or smaller in order to maintain the predetermined pressure difference.
  • a control device assigned to it has a control valve which can be acted upon by the highest load pressure and by a spring in the direction of larger stroke volume and by the pump pressure in the direction of small stroke volume.
  • a regulation for an adjustable hydraulic pump is known, which is a pressure regulation.
  • the pressure to be regulated and the setting of a control valve, which is assigned to a hydraulic consumer provided by such a hydraulic pump with pressure medium, can be predetermined jointly by a control signal.
  • the control signal can be, for example Control pressure, which is set with the aid of a pilot control device and which acts on the slide of the control valve and on the control piston of a control valve assigned to the variable displacement pump in the direction of a larger stroke volume.
  • the pump pressure may act on the control piston of the control valve in the direction of a smaller stroke volume, a control position of the control piston being possible due to a difference in size of the surfaces acted upon by the pressures.
  • the control pressure can also be raised to the level of the pump pressure with the aid of a copying valve, so that areas of the same size that can be acted upon are possible on the control piston.
  • a certain pump pressure is adjusted and the slide of a control valve is brought into a certain position in which the control valve can already be open. If the predetermined pump pressure is lower than the pressure required to move the consumer, the consumer remains at rest despite the open control valve. Only when the pump pressure reaches the load pressure through an increase in the control signal does the consumer begin to move. The beginning of this movement is the larger the opening of the control valve, the higher the load.
  • the aim of the invention is to provide a control unit for a hydraulic pump that can be adjusted according to demand flow and pressure. to create direction for which a shuttle valve can be dispensed with.
  • control device comprises a first control valve for the demand flow control and a second control valve for the pressure control, and in that the adjusting device can be controlled by the control valve, the control position of which requires the higher pump pressure in accordance with the level of the control signal and the load pressure .
  • a hydraulic distribution pump 10 can draw in pressure medium from a tank 11 and discharge it into a pressure line 12.
  • First hydraulic consumers 13 are load-sensing-controlled and second hydraulic consumers 14 can be moved in a pressure-controlled manner via this line.
  • the variable displacement pump 10 has a adjusting device 15 in the form of a hydraulic cylinder, the piston of which is acted upon by a pressure chamber 16 on the piston side
  • Pressure against the force of a spring 17 can be shifted in the direction of a reduction in the stroke volume of the pump.
  • the spring 17 can push back the piston in the sense of increasing the stroke volume.
  • the adjusting device 15 is controlled by several control valves 18, 19 and 20, all of which are designed as 3/2-way directional control valves and each have an axially movable control piston. All control pistons can be acted upon in one axial direction by a control line 21 by the pump pressure in the pressure line 12.
  • 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 activated first consumer 13 occurring load pressure can be applied.
  • a compression spring 23 acts in the same direction, the pretension of which is dimensioned such that a force equilibrium prevails at the control piston of the valve 18 when the pump pressure is 10 to 20 bar higher than the highest load pressure. If the pump pressure is overweight, an output of the control valve 18 is connected to an input which is connected to the output of the second control valve 19. If the load pressure is overweight in connection with the force of the spring 23, the outlet is connected directly to a tank line 24 bypassing the control valve 19.
  • the control piston of the control valve 19 can be acted upon by a control pressure against the pump pressure via a control line 25, which e.g. can be specified by a pilot control device that works on the basis of pressure reducing valves. While in the control valve 18 the areas on the control piston acted upon by the pump pressure or the load pressure are the same size, the pressure areas on the control piston of the control valve 19 differ since the control pressure is generally substantially less than the pump pressure.
  • the area on which the control pressure acts can e.g. be ten times as large as the other surface, so that a force equilibrium on the control piston of the control valve 19 can be established at a control pressure which is ten times smaller than the pump pressure.
  • the output of the control valve 19 connected to the one input of the control valve 18 is connected to an input when the pump pressure is overweight and is connected to the pressure line 12 via a line 26. If the control pressure is overweight, said outlet is connected to the tank line 24.
  • the control piston of the control valve 19 is acted upon by a slightly prestressed compression spring 27, which ensures that the control piston assumes a defined rest position when the pump 10 is switched off. This spring is not necessary for the regulation.
  • a maximum system pressure can be set with the third control valve 20.
  • the control piston of this valve is counteracted the pump pressure is acted upon by an adjustable compression spring 35 which, below the maximum system pressure, holds the valve in a position in which the pressure chamber 16 is connected to the outlet of the control valve 18.
  • the valve 20 connects the pressure chamber 16 to the pressure line 12.
  • the pressure chamber 16 When the pump is switched off, the pressure chamber 16 is relieved to the tank line 24 via the valves 20 and 18, but also via a nozzle 36 located in a connection between the pressure chamber 16 and the tank line 24.
  • the pump 10 is therefore set to a maximum stroke volume. If it is now switched on, a pressure builds up in the pressure line 12 even in the absence of signals in the lines 22 and 25, which adjusts the control piston of the valve 18, so that the pressure chamber 16 communicates with the pressure line via the three control valves 12 is connected and the pump 10 swings back.
  • Such a pump pressure regulates itself so that a balance of forces between the force generated by the pump pressure and the force of the spring 23 prevails on the control piston of the valve 18.
  • the level of the pressure is therefore 10 to 20 bar, depending on the preload of the spring 23.
  • the pressure chamber 16 is first relieved, so that the pump 10 swings out and the pressure in the pressure line 12 rises until the control piston of the control valve 18 is again balanced, but is now at a higher level.
  • the adjusting device 15 is used only by the control valve 19 and, if the pressure in the control line 22 requires a higher pump pressure than the pressure in the control line 25, controlled solely by the control valve 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

A control system for a variable-displacement hydraulic pump having an adjustment device and being electrical current-adjustable as required for supplying pressure to a first hydraulic apparatus (13), and pressure-adjustable for supplying pressure to a second hydraulic apparatus (14), in which case the pressure rating and the setting of the pilot valve controlled by the second hydraulic apparatus (14) may be programmed by a control signal. The control system includes a first control valve (18) that can be actuated by the weight of the load of the first apparatus (13) and by a spring (23) when switching to a higher displacement, or by the pump pressure when switching to a lower displacement. The system further includes a second control valve (19) which can be exposed to a force corresponding to the control signal (25) when switching to a higher displacement, or to the pump pressure when switching to a lower displacement.

Description

Beschreibungdescription
Regeleinrichtung für eine HydropumpeControl device for a hydraulic pump
Die Erfindung betrifft eine Regeleinrichtung für eine Hydro¬ pumpe. Gemäß dem Oberbegriff des Anspruches 1 soll mit dieser Regeleinrichtung die Hydropumpe, die eine hydraulische Verstell- einrichtung aufweist, zur Druckmittelversorung eines ersten hydraulischen Verbrauchers bedarfsstromgeregelt und zur Druck¬ mittelversorgung eines zweiten hydraulischen Verbrauchers druck¬ geregelt verstellbar sein, wobei in letzterem Falle der eingere- gelte Druck und die Einstellung eines dem zweiten hydraulischen Verbraucher zugeordneten Steuerventils gemeinsam durch ein Steu¬ ersignal vorgebbar sind.The invention relates to a control device for a hydraulic pump. According to the preamble of claim 1, the hydraulic pump, which has a hydraulic adjustment device, should be demand-flow-controlled for supplying pressure medium to a first hydraulic consumer and should be adjustable in pressure-controlled manner for supplying pressure medium to a second hydraulic consumer, in the latter case the apply pressure and the setting of a control valve assigned to the second hydraulic consumer can be predetermined jointly by a control signal.
Die Bedarfsstromregelung einer hydraulischen Verstellpumpe wird auch als load-sensing-Regelung bezeichnet. Kennzeichnend für diese Art der Regelung ist, daß der Pumpendruck um ein bestimm¬ tes Δp über dem höchsten Lastdruck aller in dieser Art und parallel zueinander angesteuerten hydraulischen Verbraucher liegt. Der Pumpendruck fällt über eine dem Verbraucher mit dem jeweils höchsten Lastdruck zugeordnete, verstellbare Blende auf den Lastdruck ab. Je nach dem Offnungsguerschnitt der Blende muß die von der Pumpe geförderte Fluidmenge größer oder kleiner sein, um die vorgegebene Druckdifferenz aufrechtzuerhalten. Für diese Bedarfsstromregelung der Hydropumpe besitzt eine dieser zugeordnete Regeleinrichtung ein Regelventil, das in Richtung größeres Hubvolumen vom höchsten Lastdruck und von einer Feder und in Richtung kleines Hubvolumen vom Pumpendruc 'beaufschlag¬ bar ist.The demand flow control of a hydraulic variable displacement pump is also referred to as load sensing control. It is characteristic of this type of control that the pump pressure is a certain Δp above the highest load pressure of all hydraulic consumers controlled in this way and in parallel to one another. The pump pressure drops to the load pressure via an adjustable orifice assigned to the consumer with the highest load pressure in each case. Depending on the opening cross-section of the orifice, the amount of fluid delivered by the pump must be larger or smaller in order to maintain the predetermined pressure difference. For this demand flow control of the hydraulic pump, a control device assigned to it has a control valve which can be acted upon by the highest load pressure and by a spring in the direction of larger stroke volume and by the pump pressure in the direction of small stroke volume.
Aus der DE 43 08 004 AI ist eine Regelung für eine verstellbare Hydropumpe bekannt, die eine Druckregelung ist. Dabei ist der einzuregelnde Druck sowie die Einstellung eines Steuerventils, das einem von einer derart geregelten Hydropumpe mit Druckmittel vorsorgten hydraulischen Verbraucher zugeordnet ist, gemeinsam durch ein Steuersignal vorgebbar. Das Steuersignal kann z.B. ein Steuerdruck sein, der mit Hilfe eines Vorsteuergerätes einge¬ stellt wird und der auf den Schieber des Steuerventils und auf den Regelkolben eines der Verstellpumpe zugeordneten Regelven¬ tils in Richtung größeres Hubvolumen wirkt. In Richtung klei- neres Hubvolumen mag auf den Regelkolben des Regelventils der Pumpendruck wirken, wobei durch einen Größenunterschied der von den Drücken beaufschlagten Flächen eine Regelstellung des Regel¬ kolbens möglich ist. Auch kann der Steuerdruck mit Hilfe eines Kopierventils auf das Niveau des Pumpendrucks angehoben werden, so daß gleich große beaufschlagbare Flächen am Regelkolben mög¬ lich sind. Bei einer Regelung gemäß der DE 43 08 004 AI werden ein bestimmter Pumpendruck eingeregelt und der Schieber eines Steuerventils in eine bestimmte Position gebracht, in der das Steuerventil auch schon offen sein kann. Ist der vorgegebene Pumpendruck kleiner als der zur Bewegung des Verbrauchers not¬ wendige Druck, so bleibt der Verbraucher trotz des offenen Steu¬ erventils in Ruhe. Erst wenn durch eine Erhöhung des Steuersi¬ gnals der Pumpendruck den Lastdruck erreicht, fängt der Verbrau¬ cher an sich zu bewegen. Der Beginn dieser Bewegung liegt also bei einem um so größeren Offnungsguerschnitt des Steuerventils, je höher die Last ist.From DE 43 08 004 AI a regulation for an adjustable hydraulic pump is known, which is a pressure regulation. The pressure to be regulated and the setting of a control valve, which is assigned to a hydraulic consumer provided by such a hydraulic pump with pressure medium, can be predetermined jointly by a control signal. The control signal can be, for example Control pressure, which is set with the aid of a pilot control device and which acts on the slide of the control valve and on the control piston of a control valve assigned to the variable displacement pump in the direction of a larger stroke volume. The pump pressure may act on the control piston of the control valve in the direction of a smaller stroke volume, a control position of the control piston being possible due to a difference in size of the surfaces acted upon by the pressures. The control pressure can also be raised to the level of the pump pressure with the aid of a copying valve, so that areas of the same size that can be acted upon are possible on the control piston. In a control according to DE 43 08 004 AI, a certain pump pressure is adjusted and the slide of a control valve is brought into a certain position in which the control valve can already be open. If the predetermined pump pressure is lower than the pressure required to move the consumer, the consumer remains at rest despite the open control valve. Only when the pump pressure reaches the load pressure through an increase in the control signal does the consumer begin to move. The beginning of this movement is the larger the opening of the control valve, the higher the load.
Aus der DE 43 08 004 AI ist es auch bekannt, eine verstellbare Hydropumpe, die mehrere hydraulische Verbraucher mit Druckmittel versorgt, für erste Verbraucher bedarfsstromgeregelt und für zweite Verbraucher druckgeregelt zu verstellen. Nach welcher Art von Regelung verfahren wird, hängt davon ab, ob ein gemeldeter höchster Lastdruck der ersten Verbraucher oder das vorgegebene Steuersignal einen höheren Pumpendruck erfordert. Dazu wird der höchste Lastdruck oder ein aus dem Steuersignal mit Hilfe einer Düse und eines verstellbaren Druckbegrenzungsventils generierte Druck über ein Wechselventil zu einem Steuerraum eines Regelven¬ tils der Verstellpumpe durchgeschaltet.From DE 43 08 004 AI it is also known to adjust an adjustable hydraulic pump, which supplies several hydraulic consumers with pressure medium, for first consumers according to demand flow and for second consumers under pressure. The type of control that is used depends on whether a reported maximum load pressure of the first consumers or the specified control signal requires a higher pump pressure. For this purpose, the highest load pressure or a pressure generated from the control signal with the aid of a nozzle and an adjustable pressure limiting valve is switched through to a control chamber of a control valve of the variable pump via a shuttle valve.
Ziel der Erfindung ist es, für eine Hydropumpe, die bedarfs- stromgeregelt und druckgeregelt verstellbar ist, eine Regelein- richtung zu schaffen, für die auf ein Wechselventil verzichtet werden kann.The aim of the invention is to provide a control unit for a hydraulic pump that can be adjusted according to demand flow and pressure. to create direction for which a shuttle valve can be dispensed with.
Dieses Ziel wird dadurch erreicht, daß die Regeleinrichtung ein erstes Regelventil für die BedarfsStromregelung und ein zweites Regelventil für die Druckregelung umfaßt und daß die Versteil¬ einrichtung jeweils von dem Regelventil steuerbar ist, dessen Regelstellung entsprechend der Höhe des Steuersignals und des Lastdrucks den höheren Pumpendruck erfordert.This goal is achieved in that the control device comprises a first control valve for the demand flow control and a second control valve for the pressure control, and in that the adjusting device can be controlled by the control valve, the control position of which requires the higher pump pressure in accordance with the level of the control signal and the load pressure .
Vorteilhafte Ausgestaltungen einer erfindungsgemäßen Regelein- richtung kann man den Unteransprüchen entnehmen.Advantageous refinements of a control device according to the invention can be found in the subclaims.
Ein Ausführungsbeispiel einer erfindungsgemäßen Regeleinrichtung ist in der Zeichnung dargestellt. Anhand dieser Zeichnung wird die Erfindung nun näher erläutert.An embodiment of a control device according to the invention is shown in the drawing. The invention will now be explained in more detail with reference to this drawing.
Nach der Zeichnung kann eine hydraulische Verteilpumpe 10 Druck- mittel aus einem Tank 11 ansaugen und in eine Druckleitung 12 abgeben. Über diese Leitung sind erste hydraulische Verbraucher 13 load-sensing-geregelt und zweite hydraulische Verbraucher 14 druckgeregelt verfahrbar. Die Verstellpumpe 10 besitzt eine Ver¬ steileinrichtung 15 in Form eines Hydrozylinders, dessen Kolben durch Beaufschlagung eines kolbenseitigen Druckraums 16 mitAccording to the drawing, a hydraulic distribution pump 10 can draw in pressure medium from a tank 11 and discharge it into a pressure line 12. First hydraulic consumers 13 are load-sensing-controlled and second hydraulic consumers 14 can be moved in a pressure-controlled manner via this line. The variable displacement pump 10 has a adjusting device 15 in the form of a hydraulic cylinder, the piston of which is acted upon by a pressure chamber 16 on the piston side
Druck gegen die Kraft einer Feder 17 in Richtung einer Verringe¬ rung des Hubvolumens der Pumpe verschoben werden kann. Bei einer Druckentlastung des Druckraums kann die Feder 17 den Kolben im Sinne einer Vergrößerung des Hubvolumens zurückschieben.Pressure against the force of a spring 17 can be shifted in the direction of a reduction in the stroke volume of the pump. When the pressure chamber is relieved of pressure, the spring 17 can push back the piston in the sense of increasing the stroke volume.
Die VerStelleinrichtung 15 wird von mehreren Regelventilen 18, 19 und 20 gesteuert, die alle als 3/2-Stetig-Wegeventil ausge¬ bildet sind und jeweils einen axial beweglichen Regelkolben auf¬ weisen. Alle Regelkolben sind in die eine axiale Richtung über jeweils eine Steuerleitung 21 vom in der Druckleitung 12 herr- sehenden Pumpendruck beaufschlagbar.The adjusting device 15 is controlled by several control valves 18, 19 and 20, all of which are designed as 3/2-way directional control valves and each have an axially movable control piston. All control pistons can be acted upon in one axial direction by a control line 21 by the pump pressure in the pressure line 12.
Der Regelkolben des ersten Regelventils 18 ist in die entgegen¬ gesetzte Richtung über eine Steuerleitung 22 vom höchsten an den gerade betätigten ersten Verbraucher 13 vorkommenden Lastdruck beaufschlagbar. In die gleiche Richtung wirkt eine Druckfeder 23, deren Vorspannung so bemessen ist, daß dann ein Kräfte¬ gleichgewicht am Regelkolben des Ventils 18 herrscht, wenn der Pumpendruck um 10 bis 20 bar höher ist als der höchste Last¬ druck. Ein Ausgang des Regelventils 18 wird bei einem Überge¬ wicht des Pumpendrucks mit einem Eingang verbunden, der an den Ausgang des zweiten Regelventils 19 angeschlossen ist. Bei einem Übergewicht des Lastdrucks in Verbindung mit der Kraft der Feder 23 ist der Ausgang direkt unter Umgehung des Regelventils 19 mit einer Tankleitung 24 verbunden.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 activated first consumer 13 occurring load pressure can be applied. A compression spring 23 acts in the same direction, the pretension of which is dimensioned such that a force equilibrium prevails at the control piston of the valve 18 when the pump pressure is 10 to 20 bar higher than the highest load pressure. If the pump pressure is overweight, an output of the control valve 18 is connected to an input which is connected to the output of the second control valve 19. If the load pressure is overweight in connection with the force of the spring 23, the outlet is connected directly to a tank line 24 bypassing the control valve 19.
Der Regelkolben des Regelventils 19 ist entgegen dem Pumpendruck über eine Steuerleitung 25 von einem Steuerdruck beaufschlagbar, der z.B. von einem auf der Basis von Druckreduzierventilen funk- tionierenden Vorsteuergerät vorgegeben werden kann. Während beim Regelventil 18 die vom Pumpendruck bzw. vom Lastdruck beauf¬ schlagten Flächen am Regelkolben gleich groß sind, unterscheiden sich die Druckflächen am Regelkolben des Regelventils 19, da der Steuerdruck im allgemeinen wesentlich kleiner als der Pumpen- druck ist. Die Fläche, an der der Steuerdruck wirkt, kann z.B. zehnmal so groß wie die andere Fläche sein, so daß bei einem ge¬ genüber dem Pumpendruck zehnmal kleineren Steuerdruck ein Kräf¬ tegleichgewicht am Regelkolben des Regelventils 19 hergestellt werden kann. Der mit dem einen Eingang des Regelventils 18 ver- bundene Ausgang des Regelventils 19 ist bei einem Übergewicht des Pumpendrucks mit einem Eingang verbunden, der über eine Lei¬ tung 26 an die Druckleitung 12 angeschlossen ist. Bei einem Übergewicht des Steuerdrucks wird der besagte Ausgang mit der Tankleitung 24 verbunden. Der Regelkolben des Regelventils 19 wird noch von einer leicht vorgespannten Druckfeder 27 beauf¬ schlagt, die dafür sorgt, daß der Regelkolben eine definierte Ruhelage einnimmt, wenn die Pumpe 10 ausgeschaltet ist. Für die Regelung ist dieser Feder nicht notwendig.The control piston of the control valve 19 can be acted upon by a control pressure against the pump pressure via a control line 25, which e.g. can be specified by a pilot control device that works on the basis of pressure reducing valves. While in the control valve 18 the areas on the control piston acted upon by the pump pressure or the load pressure are the same size, the pressure areas on the control piston of the control valve 19 differ since the control pressure is generally substantially less than the pump pressure. The area on which the control pressure acts can e.g. be ten times as large as the other surface, so that a force equilibrium on the control piston of the control valve 19 can be established at a control pressure which is ten times smaller than the pump pressure. The output of the control valve 19 connected to the one input of the control valve 18 is connected to an input when the pump pressure is overweight and is connected to the pressure line 12 via a line 26. If the control pressure is overweight, said outlet is connected to the tank line 24. The control piston of the control valve 19 is acted upon by a slightly prestressed compression spring 27, which ensures that the control piston assumes a defined rest position when the pump 10 is switched off. This spring is not necessary for the regulation.
Mit dem dritten Regelventil 20 kann ein maximaler Systemdruck eingestellt werden. Der Regelkolben dieses Ventils wird entgegen dem Pumpendruck von einer einstellbaren Druckfeder 35 beauf¬ schlagt, die unterhalb des maximalen Systemdrucks das Ventil in einer Position hält, in der der Druckraum 16 mit dem Ausgang des Regelventils 18 verbunden ist. Wenn der maximale Systemdruck er- reicht wird, verbindet das Ventil 20 den Druckraum 16 mit der Druckleitung 12.A maximum system pressure can be set with the third control valve 20. The control piston of this valve is counteracted the pump pressure is acted upon by an adjustable compression spring 35 which, below the maximum system pressure, holds the valve in a position in which the pressure chamber 16 is connected to the outlet of the control valve 18. When the maximum system pressure is reached, the valve 20 connects the pressure chamber 16 to the pressure line 12.
Bei ausgeschalteter Pumpe ist der Druckraum 16 über die Ventile 20 und 18, aber auch über eine in eine Verbindung zwischen dem Druckraum 16 und der Tankleitung 24 liegenden Düse 36 zur Tankleitung 24 hin entlastet. Die Pumpe 10 ist also auf maxima¬ les Hubvolumen eingestellt. Wird sie nun eingeschaltet, so baut sich in der Druckleitung 12 auch bei fehlenden Signalen in den Leitungen 22 und 25 ein Druck auf, der den Regelkolben des Ven¬ tils 18 verstellt, so daß der Druckraum 16 über die drei Regel- ventile mit der Druckleitung 12 verbunden wird und die Pumpe 10 zurückschwenkt. Es regelt sich ein solcher Pumpendruck ein, daß am Regelkolben des Ventils 18 ein Kräftegleichgewicht zwischen der vom Pumpendruck erzeugten Kraft und der Kraft der Feder 23 herrscht. Die Höhe des Drucks beträgt also je nach Vorspannung der Feder 23 10 bis 20 bar.When the pump is switched off, the pressure chamber 16 is relieved to the tank line 24 via the valves 20 and 18, but also via a nozzle 36 located in a connection between the pressure chamber 16 and the tank line 24. The pump 10 is therefore set to a maximum stroke volume. If it is now switched on, a pressure builds up in the pressure line 12 even in the absence of signals in the lines 22 and 25, which adjusts the control piston of the valve 18, so that the pressure chamber 16 communicates with the pressure line via the three control valves 12 is connected and the pump 10 swings back. Such a pump pressure regulates itself so that a balance of forces between the force generated by the pump pressure and the force of the spring 23 prevails on the control piston of the valve 18. The level of the pressure is therefore 10 to 20 bar, depending on the preload of the spring 23.
Bei einem Lastsignal in der Steuerleitung 22 wird der Druckraum 16 zunächst entlastet, so daß die Pumpe 10 ausschwenkt und der Druck in der Druckleitung 12 soweit ansteigt, bis am Regelkolben des Regelventils 18 wieder ein Kräftegleichgewicht besteht, das nun jedoch auf höherem Niveau liegt.With a load signal in the control line 22, the pressure chamber 16 is first relieved, so that the pump 10 swings out and the pressure in the pressure line 12 rises until the control piston of the control valve 18 is again balanced, but is now at a higher level.
Wird nun ein Drucksignal auf die Steuerleitung 25 gegeben, so ändert sich am Zustand der Regelventile und der Verstelleinrich- tung solange nichts, solange diesem Steuerdruck ein Pumpendruck entspricht, der unterhalb des schon aufgrund des Signals in der Steuerleitung 22 erreichten Pumpendrucks liegt. Steigt der Steu¬ erdruck in der Steuerleitung 25 über einen Wert, der dem augen¬ blicklichen Pumpendruck entspricht an, so wird der mit dem Re¬ gelventil 18 verbundene Ausgang des Regelventils 19 mit der Tankleitung 24 verbunden. Der Druckraum 16 wird druckentlastet. so daß die Pumpe 10 ausschwenkt und der Druck in der Drucklei¬ tung 12 über den dem Druck in der Steuerleitung 22 entsprechen¬ den Druck bis zu einem solchen Wert ansteigt, daß in der Regel¬ stellung des Regelkolbens des Regelventils 19 am Regelkolben ein Kräftegleichgewicht zwischen der vom Pumpendruck erzeugten Kraft und der vom Steuerdruck in der Steuerleitung 25 erzeugten Kraft hergestellt ist. Der höhere Pumpendruck verschiebt den Regelkol¬ ben des Regelventils 18 so, daß dessen Ausgang mit dem Ausgang des Regelventils 19 verbunden ist, so daß nun allein das Regelventil 19 regelt.If a pressure signal is now given to the control line 25, nothing changes in the state of the control valves and the adjusting device as long as this control pressure corresponds to a pump pressure which is below the pump pressure already reached due to the signal in the control line 22. If the control pressure in the control line 25 rises above a value which corresponds to the current pump pressure, the outlet of the control valve 19 connected to the control valve 18 is connected to the tank line 24. The pressure chamber 16 is relieved of pressure. so that the pump 10 swings out and the pressure in the pressure line 12 rises above the pressure corresponding to the pressure in the control line 22 up to such a value that in the control position of the control piston of the control valve 19 an equilibrium of forces on the control piston the force generated by the pump pressure and the force generated by the control pressure in the control line 25. The higher pump pressure displaces the control piston of the control valve 18 so that its output is connected to the output of the control valve 19, so that the control valve 19 alone now controls.
Die Versteileinrichtung 15 wird also, sofern der Druck in der Steuerleitung 25 einen höheren Pumpendruck erfordert als der Druck in der Steuerleitung 22, allein vom Regelventil 19 und, sofern der Druck in der Steuerleitung 22 einen höheren Pumpen- druck erfordert als der Druck in der Steuerleitung 25, allein vom Regelventil 18 gesteuert. If the pressure in the control line 25 requires a higher pump pressure than the pressure in the control line 22, the adjusting device 15 is used only by the control valve 19 and, if the pressure in the control line 22 requires a higher pump pressure than the pressure in the control line 25, controlled solely by the control valve 18.

Claims

Patentansprüche claims
1. 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 ge¬ meinsam durch ein Steuersignal vorgebbar sind, gekennzeichnet durch ein erstes Regelventil (18), das in Richtung größeres Hub¬ volumen der Hydropumpe (10) vom Lastdruck des ersten Verbrau¬ chers (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 er- fordert.1. Control device for a hydraulic pump (10) which has a hydraulic adjusting device (15) and which is demand-flow-controlled for supplying pressure medium to a first hydraulic consumer (13) and pressure-controlled for supplying pressure medium to a second hydraulic consumer (14), the regulated pressure and the setting of a control valve assigned to the second hydraulic consumer (14) can be predetermined together by a control signal, characterized by a first control valve (18) which, in the direction of the larger stroke volume of the hydraulic pump (10), depends on the load pressure of the first consumer (13) and can be acted upon by a spring (23) and in the direction of smaller stroke volume by the pump pressure, and by a second control valve (19) which can be acted upon in the direction of larger stroke volume by a force corresponding to the control signal and in the direction of smaller stroke volume by pump pressure, the adjusting device (15) from the control valve (18, 19 ) is controllable, the control position of which requires the higher pump pressure in accordance with the level of the control signal and the load pressure.
2. Regeleinrichtung nach Anspruch 1, dadurch gekennzeich¬ net, daß das eine Regelventil (19) über das andere Regelventil (18) mit der Versteileinrichtung (15) und letzteres Regelventil (18) über ersteres Regelventil (19) mit der Druckseite (12) der Hydropumpe (10) verbindbar ist.2. Control device according to claim 1, characterized gekennzeich¬ net that the one control valve (19) via the other control valve (18) with the adjusting device (15) and the latter control valve (18) via the first control valve (19) with the pressure side (12) the hydraulic pump (10) can be connected.
3. Regeleinrichtung nach Anspruch 1 oder 2, dadurch gekenn¬ zeichnet, daß ein Anschluß des ersten Regelventils (18) unabhän¬ gig vom zweiten Regelventil (19) und ein Anschluß des zweiten Regelventils (19) unabhängig vom ersten Regelventil (18) mit ei- nem Tank (11) verbunden ist.3. Control device according to claim 1 or 2, characterized gekenn¬ characterized in that a connection of the first control valve (18) independent of the second control valve (19) and a connection of the second control valve (19) independently of the first control valve (18) with egg - Nem tank (11) is connected.
4. Regeleinrichtung nach den Ansprüchen 3 und 4, dadurch gekennzeichnet, daß beide Regelventile (18, 19) 3/2-Stetig-Wege- ventile sind, daß ein mit der Versteileinrichtung (15) verbunde¬ ner 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 Regelven¬ tils (19) verbindbar ist. 4. Control device according to claims 3 and 4, characterized in that both control valves (18, 19) are 3/2-way valves, that with the adjusting device (15) verbunde¬ ner connection of a control valve (18) alternately with one a connection connected to the tank or to a connection of one control valve (18) connected to a connection of the other control valve (19) and that the connection of the other control valve (19) connected to one connection of the one control valve (18) alternately with a connection connected to the tank (11) or with a connection connected to the pressure side (12) of the hydraulic pump (10) of the other control valve (19).
EP95909750A 1994-02-26 1995-02-21 Hydraulic pump control system Expired - Lifetime EP0746690B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4406318 1994-02-26
DE4406318A DE4406318A1 (en) 1994-02-26 1994-02-26 Control device for a hydraulic pump
PCT/EP1995/000611 WO1995023292A1 (en) 1994-02-26 1995-02-21 Hydraulic pump control system

Publications (2)

Publication Number Publication Date
EP0746690A1 true EP0746690A1 (en) 1996-12-11
EP0746690B1 EP0746690B1 (en) 1999-01-13

Family

ID=6511292

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95909750A Expired - Lifetime EP0746690B1 (en) 1994-02-26 1995-02-21 Hydraulic pump control system

Country Status (5)

Country Link
US (1) US5720168A (en)
EP (1) EP0746690B1 (en)
JP (1) JPH09510002A (en)
DE (2) DE4406318A1 (en)
WO (1) WO1995023292A1 (en)

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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 (en) * 2007-10-29 2011-02-24 Sauer-Danfoss Gmbh & Co Ohg Hydraulic supply system with a variable displacement pump device
CN103717911B (en) * 2011-03-17 2016-10-19 派克汉尼芬公司 For controlling multi-functional electrohydraulic system
DE102016000186A1 (en) * 2016-01-11 2017-07-13 Liebherr-Hydraulikbagger Gmbh Device for the controllable hydraulic supply of differently regulated hydraulic consumers as well as hydraulic system and working machine
CN107061394B (en) * 2016-11-22 2018-10-23 宣城托新精密科技有限公司 The electrohydraulic controlling mechanism of adjustable pressure susceptibility

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Also Published As

Publication number Publication date
EP0746690B1 (en) 1999-01-13
US5720168A (en) 1998-02-24
DE4406318A1 (en) 1995-08-31
DE59504821D1 (en) 1999-02-25
JPH09510002A (en) 1997-10-07
WO1995023292A1 (en) 1995-08-31

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