EP2496843B1 - Hydraulic control arrangement with a regulating pressure gradient which can be varied via an ls-valve - Google Patents
Hydraulic control arrangement with a regulating pressure gradient which can be varied via an ls-valve Download PDFInfo
- Publication number
- EP2496843B1 EP2496843B1 EP10752313.6A EP10752313A EP2496843B1 EP 2496843 B1 EP2496843 B1 EP 2496843B1 EP 10752313 A EP10752313 A EP 10752313A EP 2496843 B1 EP2496843 B1 EP 2496843B1
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- European Patent Office
- Prior art keywords
- pressure
- switching valve
- control
- line
- valve
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Classifications
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- 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
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- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
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- 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
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- 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
- F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
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- 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
- F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
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- 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
- F15B2211/52—Pressure control characterised by the type of actuation
- F15B2211/528—Pressure 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
- F15B2211/60—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
Definitions
- the present invention relates to a hydraulic control arrangement with variable control pressure gradient according to the preamble of patent claim 1.
- a control or valve block of a constant or controllable pump is connected downstream, which includes a pressure compensator and a preferably adjustable pressure relief valve.
- a control block of a known control arrangement is in the appended Fig. 2 shown.
- control block of a generic control arrangement has a 2/2-way proportional valve whose input port is connected to the pump and whose output port is connected to a hydraulic tank.
- One control side of the proportional directional valve is acted upon by the pump pressure and the other control side is acted upon by two series-connected throttles with the load pressure of a consumer and a biasing spring.
- This structure forms a pressure compensator whose pre-tensioning spring determines a pressure gradient or pressure difference between the pump pressure and the load pressure, which is kept constant by the pressure compensator.
- the biasing spring opposite control side of the pressure compensator is connected via a throttle to the pump pressure line, in parallel with a built-in pressure compensator 2/2 switching valve is arranged, which can connect the pump pressure line to the control line.
- the 2/2-way valve blocks the connection line between the pump line and the control line, so that the pump spring pressure is applied to the control side of the pressure compensator opposite the pretension spring.
- a neutral circulation pressure corresponding to the control force of the biasing spring is established.
- control pressure in the control line increases, whereby the 2/2-way valve opens and a corresponding control pressure acts in addition to the biasing spring on the pressure compensator.
- the pump pressure rises to a correspondingly higher pressure value, which is held by the pressure compensator.
- the essence of the invention is therefore to equip the hydraulic control assembly with an inlet pressure compensator consisting of a proportional directional control valve whose one control side is acted upon by a throttled load load and a biasing spring and the other control side with a throttled pump pressure, wherein a hydraulically controlled switching valve is provided to the selected throttled connection of the two control sides of the proportional directional control valve.
- this basic structure corresponds to that in the FIG. 3 shown known control arrangement.
- a further preferably electromagnetic switching valve is now arranged which selectively opens a bypass line to the hydraulically actuated switching valve to force-connect a throttled bypass connection between the two control sides of the proportional directional control valve.
- This further switching valve is selectively actuated in order to start the preselected in neutral circulation low pressure gradient (only dependent on the biasing spring) to a predeterminable value (corresponding to the throttle setting in the bypass line), which allows a start of a further consumption via the (external) control block.
- a preferably adjustable throttle in the bypass line is connected directly upstream of the electromagnetic switching valve.
- This throttle may thus have a different setting than the hydraulically actuated switching valve immediately upstream throttle, so that upon activation of the electromagnetic switching valve, a neutral circulation pressure differential is different from the pressure drop in the consumer operation with non-activated electromagnetic switching valve.
- a number of hydraulically operated 2-position / 3-way switching valves are serially interposed in a connecting line between the electromagnetic switching valve and the pressure balance, whose output terminal in each case with the one input terminal of each connected downstream of the switching valve whose other input terminal is connected via a respective branch line to the pump-pressure-loaded control side of the pressure compensator and whose respective control side is connected to the consumer pressure line of the respective associated control block.
- it is preferably provided to connect a further preferably adjustable throttle in each branch line to the respective hydraulically actuated switching valve.
- the control arrangement is integrated according to a preferred embodiment of the invention in an internal control block and has a pressure compensating 2-way / 2-position proportional directional control valve 1, at its input terminal a pump 2 is connected and the output terminal leads to a pressure medium tank 4.
- the one control side x of the proportional directional valve 1 is connected to the pump 2 via a second throttle D2.
- the other control side y of the proportional directional valve 1 is spring-loaded and connected via a first throttle D1 with a consumer pressure main line 6. From this consumer pressure main 6 is a pressure relief line 8 into the tank 4, in which a preferably adjustable pressure relief valve 10 is interposed.
- Each of the manually operated switching valves 12 has a consumer pressure port, which is connected via an internal consumer pressure branch line 14 to the consumer pressure main line 6 upstream of the throttle D1, and a consumer pressure expansion port, which is connected to the pressure medium tank 4.
- the two control sides x, y of the pressure compensator forming proportional directional control valve 1 are hydraulically connected to each other via a short line 16, in which a hydraulically controlled switching valve ZV1, in the present case a 2/2-switching valve is interposed, whose one control side is spring-biased and the other control side of the pressure is acted upon by the spring-biased control side of the proportional directional valve 1.
- This hydraulically controlled switching valve ZV1 is a preferably adjustable throttle / aperture D3 immediately upstream.
- the component combination consisting of the hydraulically controlled switching valve ZV1 and the immediately upstream throttle D3 is provided with a bypass line 18 bypassing this, the upstream of the throttle D3 branches off from the short-circuit line 16 and downstream to the hydraulically controlled switching valve ZV1 back in the short-circuit line 16 opens.
- an electromagnetic 3-way / 2-position switching valve ZVA is interposed, a preferably adjustable throttle / aperture DA is connected immediately upstream.
- This throttle DA is / can be set differently to the throttle D3.
- the electromagnetic switching valve ZVA connects in a first switching position (preferably not activated), the hydraulically controlled switching valve ZV1 with the spring-biased control side of the pressure compensator 1.
- a second switching position blocks the electromagnetic switching valve ZVA the hydraulically controlled switching valve ZV1 and instead connects the Short-circuit line 16 via the throttle DA with the spring-loaded control side of the pressure compensator 1.
- each external control block 20, 22 is connected via a pump line 24 directly to the pump 2 and further has an external consumer pressure branch line 26, 28, which opens via an external shuttle valve 30 in the consumer pressure main line 6.
- Each external control block 20, 22 is an external hydraulically controlled 3-way / 2-position switching valve ZV2, ZV3 assigned and connected in series in the short-circuit line 16 to the electromagnetic switching valve ZVA.
- the hydraulically actuated switching valve ZV2 assigned to the first external control block 20 is immediately downstream of the electromagnetic switching valve ZVA, wherein one of its input terminals is connected to the output terminal of the electromagnetic switching valve ZVA and its second input terminal is connected via an immediately upstream, preferably adjustable Throttle D4 with the short-circuit line 16 upstream is connected to the throttle D3 (ie directly with the pump-pressure-loaded control side of the pressure compensator 1).
- the external hydraulically-operated switching valve ZV3 associated with the second external control block 22 is immediately connected in the short-circuit line 16 to the external hydraulically operated switching valve ZV2 of the first external control block 20, and its one input port is connected to the output port of the external hydraulically-operated switching valve ZV2 of the first external control block 20 is and whose second input terminal is connected via an immediately upstream, preferably adjustable throttle D5 with the short-circuit line 16 upstream of the throttle D3 (ie directly with the pump pressure-loaded control side of the pressure compensator 1).
- the one control side of both external hydraulically actuated switching valves ZV2, ZV3 is spring-biased, wherein the other control side in each case with the consumption pressure of the first, and the second external control block 20, 22 are acted upon.
- the order of the serially arranged external hydraulically actuated switching valves ZV2, ZV3 is not arbitrary, but corresponds to the required pressure drop of the external control blocks 20, 22 in the consumer mode.
- the hydraulically operated switching valve ZV2 of the first external pressure control block 20 is immediately downstream of the electromagnetic switching valve ZVA and is followed by the hydraulically operated switching valve Z3 of the second higher pressure differential control block 22 and so on.
- the consumer pressure main line 6 is depressurized, since the control oil flow in the consumer pressure line 6 via the manually operable Switching valves 12 is relaxed in the pressure medium tank 4. Furthermore, the short-circuit line 16 between the two control sides x, y of the pressure compensator 1 is locked, since the interposed hydraulically controlled switching valve ZV1 is not activated in the absence of a consumer pressure.
- the control pressure gradient depends solely on the spring force of the biasing spring on the pressure compensator 1, which is set according to the selection of the spring force to a low value.
- Fig. 1 is closed by activating the solenoid valve ZVA, the short-circuit line 16, whereby a control oil flow from the pump 2 via a series circuit of the restrictors (orifices) D2 and DA and the pump-pressure-loaded control side x of the pressure compensator 1 to the spring-biased control side y flows.
- the pressurization of the spring-biased control side y of the pressure compensator 1 can be changed so that the desired control pressure increase over the standard neutral circulation described above is achieved.
- the required higher control pressure signal is selected at the shuttle valve WSV-EX and passed to the pressure compensator 1 (at the spring-biased control side y).
- the hydraulically actuated switching valve ZV3 switches by the supplied consumer pressure from the external second control block 22 and thus activates the diaphragm row D2 and D5.
- a suitable diaphragm variation at the diaphragm D5 the even higher control pressure gradient for the external second control block 22 can be set.
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- Fluid-Pressure Circuits (AREA)
Description
Die vorliegende Erfindung betrifft eine hydraulische Steueranordnung mit veränderbarem Regeldruckgefälle gemäß dem Oberbegriff des Patentanspruchs 1.The present invention relates to a hydraulic control arrangement with variable control pressure gradient according to the preamble of patent claim 1.
In einer hydraulischen Steueranordnung dieser Gattung ist ein Steuer- bzw. Ventilblock einer Konstant- oder regelbaren Pumpe nachgeschaltet, der eine Druckwaage sowie ein vorzugsweise einstellbares Druckbegrenzungsventil enthält. Ein Beispiel für einen derartigen Steuerblock einer bekannten Steueranordnung ist in der anliegenden
Demzufolge hat der Steuerblock einer gattungsgemäßen Steueranordnung ein 2/2-Proportionalwegeventil, dessen Eingangsanschluss an die Pumpe und dessen Ausgangsanschluss an einen Hydrauliktank angeschlossen ist. Eine Steuerseite des Proportionalwegeventils ist mit dem Pumpendruck beaufschlagt und die andere Steuerseite ist über zwei seriell geschaltete Drosseln mit dem Lastdruck eines Verbrauchers sowie einer Vorspannfeder beaufschlagt. Dieser Aufbau bildet eine Druckwaage, deren Vor-spannfeder ein Druckgefälle bzw. Druckdifferenz zwischen dem Pumpendruck und dem Lastdruck bestimmt, welches durch die Druckwaage konstant gehalten wird. D.h., befindet sich beispielsweise die Steuerleitung in entlastetem Zustand (Lastdruck = 0), bewirkt der auf die gegenüberliegende Steuerseite einwirkende Pumpendruck ein Öffnen des Proportionalventils, das demzufolge den Pumpendruck auf den eingestellten Druckdifferenzwert entspannt. Dieser Zustand wird auch als Neutralumlauf bezeichnet.Accordingly, the control block of a generic control arrangement has a 2/2-way proportional valve whose input port is connected to the pump and whose output port is connected to a hydraulic tank. One control side of the proportional directional valve is acted upon by the pump pressure and the other control side is acted upon by two series-connected throttles with the load pressure of a consumer and a biasing spring. This structure forms a pressure compensator whose pre-tensioning spring determines a pressure gradient or pressure difference between the pump pressure and the load pressure, which is kept constant by the pressure compensator. In other words, if, for example, the control line is in the unloaded state (load pressure = 0), the pump pressure acting on the opposite control side causes the proportional valve to open, which consequently relaxes the pump pressure to the set pressure difference value. This condition is also called neutral circulation.
Steigt der Lastdruck am Verbraucher an, erhöht sich auch der Druck in der Steuerleitung, wobei das Proportionalventil für einen Druckaufbau in der Pumpenleitung solange geschlossen wird, bis der eingestellte Differenzdruckwert erreicht ist.If the load pressure at the load increases, the pressure in the control line also increases, whereby the proportional valve for pressure build-up in the pump line is closed until the set differential pressure value is reached.
Es liegt auf der Hand, dass bei einer solchen Steueranordnung je nach Höhe des voreingestellten Druckgefälles im Fall eines Neutralumlaufs die Verlustenergie inakzeptabel hoch ist. Aus diesem Grund wurde im Stand der Technik eine Steueranordnung vorgeschlagen, die eine Druckgefälle-Umschaltung von einem hohen Wert im Fall eines Verbraucherbetriebs auf einen niedrigen Wert im Fall eines Neutralumlaufs vorsieht. Eine derartige Steueranordnung ist beispielhaft in der
Demzufolge ist die der Vorspannfeder gegenüberliegende Steuerseite der Druckwaage über eine Drossel an die Pumpendruckleitung angeschlossen, wobei parallel hierzu ein in der Druckwaage integriertes 2/2-Schaltventil angeordnet ist, das die Pumpendruckleitung mit der Steuerleitung verbinden kann. Im Fall eines Neutralumlaufs bei entlasteter Steuerleitung sperrt das 2/2-Schaltventil die Verbindungsleitung zwischen der Pumpenleitung und der Steuerleitung, sodass die der Vorspannfeder gegenüberliegenden Steuerseite der Druckwaage vom Pumpendruck beaufschlagt wird. Demzufolge stellt sich ein Neutralumlaufdruck entsprechend der Steuerkraft der Vorspannfeder ein.Accordingly, the biasing spring opposite control side of the pressure compensator is connected via a throttle to the pump pressure line, in parallel with a built-in
Wird der Verbraucher aktiviert, steigt der Steuerdruck in der Steuerleitung an, wodurch das 2/2-Schaltventil geöffnet und ein entsprechender Steuerdruck zusätzlich zur Vorspannfeder auf die Druckwaage einwirkt. Hierdurch steigt der Pumpendruck auf einen entsprechend höheren Druckwert, der von der Druckwaage gehalten wird.If the consumer is activated, the control pressure in the control line increases, whereby the 2/2-way valve opens and a corresponding control pressure acts in addition to the biasing spring on the pressure compensator. As a result, the pump pressure rises to a correspondingly higher pressure value, which is held by the pressure compensator.
Obgleich in der zuletzt beschriebenen Steueranordnung gemäß der
Ein weiteres Beispiel ist in
Angesichts dieser Problematik ist es eine Aufgabe der vorliegenden Erfindung, eine Steueranordnung bereit zu stellen, die für mehrere verschiedene Verbraucher unterschiedliche Druckgefälle einstellen kann.In view of this problem, it is an object of the present invention to provide a control arrangement which can set different pressure gradients for several different consumers.
Diese Aufgabe wird durch eine Steueranordnung mit den Merkmalen des Patentanspruchs 1 gelöst. Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by a control arrangement having the features of patent claim 1. Further advantageous embodiments of the invention are the subject of the dependent claims.
Der Kern der Erfindung besteht demzufolge darin, die hydraulische Steueranordnung mit einer Eingangsdruckwaage bestehend aus einem Proportionalwegeventil auszustatten, dessen eine Steuerseite mit einem gedrosselten Verbraucherlastdruck sowie einer Vorspannfeder und dessen andere Steuerseite mit einem gedrosselten Pumpendruck beaufschlagt ist, wobei ein hydraulisch gesteuertes Schaltventil vorgesehen ist zum ausgewählten gedrosselten Verbinden der beiden Steuerseiten des Proportionalwegeventils. Insoweit entspricht dieser prinzipielle Aufbau der in der
Gemäß einer bevorzugten Ausgestaltung der Erfindung ist dem elektromagnetischen Schaltventil eine vorzugsweise verstellbare Drossel in der Bypassleitung unmittelbar vorgeschaltet. Diese Drossel kann folglich eine andere Einstellung aufweisen als die dem hydraulisch betätigten Schaltventil unmittelbar vorgeschaltete Drossel, sodass sich bei Aktivierung des elektromagnetischen Schaltventils ein Neutralumlauf-Druckgefälle unterschiedlich zum Druckgefälle im Verbraucherbetrieb bei nicht aktiviertem elektromagnetischem Schaltventil ergibt.According to a preferred embodiment of the invention, a preferably adjustable throttle in the bypass line is connected directly upstream of the electromagnetic switching valve. This throttle may thus have a different setting than the hydraulically actuated switching valve immediately upstream throttle, so that upon activation of the electromagnetic switching valve, a neutral circulation pressure differential is different from the pressure drop in the consumer operation with non-activated electromagnetic switching valve.
Weiter vorteilhaft ist es, wenn entsprechend einer Anzahl von externen Steuerblöcken eine Anzahl von hydraulisch betätigten 2-Stellungs-/3-Wege-Schaltventilen seriell in eine Verbindungsleitung zwischen dem elektromagnetischen Schaltventil und der Druckwaage zwischengeschaltet sind, deren Ausgangsanschluss jeweils mit dem einen Eingangsanschluss des jeweils nachfolgenden Schaltventils verbunden ist, deren anderer Eingangsanschluss über jeweils eine Zweigleitung an die pumpendruckbeaufschlagte Steuerseite der Druckwaage angeschlossen ist und deren jeweils eine Steuerseite an die Verbraucherdruckleitung des jeweils zugeordneten Steuerblocks angeschlossen ist. Dabei ist es vorzugsweise vorgesehen, in jeder Zweigleitung eine weiter vorzugsweise verstellbare Drossel dem jeweiligen hydraulisch betätigten Schaltventil vorzuschalten. Auf diese Weise wird je nach Betätigung eines der externen Verbraucher das zugehörige hydraulisch betätigte Schaltventil aktiviert, wobei sich ein entsprechend der Einstellung der jeweils vorgeschalteten Drossel unterschiedliches Druckgefälle im Verbraucherbetrieb ergibt.It is also advantageous if, according to a number of external control blocks, a number of hydraulically operated 2-position / 3-way switching valves are serially interposed in a connecting line between the electromagnetic switching valve and the pressure balance, whose output terminal in each case with the one input terminal of each connected downstream of the switching valve whose other input terminal is connected via a respective branch line to the pump-pressure-loaded control side of the pressure compensator and whose respective control side is connected to the consumer pressure line of the respective associated control block. In this case, it is preferably provided to connect a further preferably adjustable throttle in each branch line to the respective hydraulically actuated switching valve. In this way, depending on the operation of one of the external consumers, the associated hydraulically actuated switching valve is activated, resulting in a different according to the setting of the respective upstream throttle differential pressure gradient in consumer operation.
Dies bedeutet, dass sich nicht nur das Neutralumlauf-Druckgefälle bedarfsgerecht anpassen lässt, sondern auch das Druckgefälle im Verbraucherbetrieb über die entsprechend angeordneten hydraulischen Schaltventile immer an den Verbraucher mit der augenblicklich höchsten Druckgefälle-Anforderung eingestellt wird. Dies trägt ebenfalls zu einer erheblichen Reduzierung an Verlustenergie bei.This means that not only the neutral circulation pressure drop can be adjusted as needed, but also the pressure drop in consumer operation via the correspondingly arranged hydraulic switching valves is always set to the consumer with the highest pressure drop requirement currently. This also contributes to a significant reduction in energy loss.
Die Erfindung wird nachstehend anhand eines bevorzugten Ausführungsbeispiels unter Bezugnahme auf die begleitende Zeichnung näher erläutert.
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Fig. 1 zeigt ein Schaltbild einer hydraulischen Steueranordnung insbesondere mit einer Eingangsdruckwaage mit einstellbarem Regeldruckgefälle für mehrere Verbraucher gemäß einem bevorzugten Ausführungsbeispiel der Erfindung, -
Fig. 2 zeigt ein Schaltbild einer hydraulischen Steueranordnung mit fixem Druckgefälle gemäß einem Stand der Technik und -
Fig. 3 zeigt ein Schaltbild einer hydraulischen Steuerung mit umschaltbarem Druckgefälle gemäß einem Stand der Technik.
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Fig. 1 shows a circuit diagram of a hydraulic control arrangement, in particular with an inlet pressure compensator with adjustable control pressure drop for multiple consumers according to a preferred embodiment of the invention, -
Fig. 2 shows a circuit diagram of a hydraulic control arrangement with a fixed pressure gradient according to a prior art and -
Fig. 3 shows a circuit diagram of a hydraulic control with switchable pressure gradient according to a prior art.
Gemäß der
Des Weiteren sind in dem internen Steuerblock eine Anzahl von manuell betätigten Schaltventilen 12 zur Aktivierung jeweils eines nicht weiter gezeigten hydraulischen Verbrauchers integriert. Jedes der manuell betätigten Schaltventile 12 hat einen Verbraucherdruckanschluss, der über eine interne Verbraucherdruck-Zweigleitung 14 mit der Verbraucherdruck-Hauptleitung 6 stromauf zur Drossel D1 verbunden ist, sowie einen Verbraucherdruck-Entspannungsanschluss, der mit dem Druckmitteltank 4 verbunden ist.Furthermore, a number of manually operated
Die beiden Steuerseiten x, y des die Druckwaage bildenden Proportionalwegeventils 1 sind über eine Kurzschlussleitung 16 hydraulisch miteinander verbindbar, in die ein hydraulisch gesteuertes Schaltventil ZV1, vorliegend ein 2/2-Schaltventil zwischengeschaltet ist, dessen eine Steuerseite federvorgespannt ist und dessen andere Steuerseite vom Druck an der federvorgespannten Steuerseite des Proportionalwegeventils 1 beaufschlagt ist. Diesem hydraulisch gesteuerten Schaltventil ZV1 ist eine vorzugsweise einstellbare Drossel/Blende D3 unmittelbar vorgeschaltet.The two control sides x, y of the pressure compensator forming proportional directional control valve 1 are hydraulically connected to each other via a
Der bis dato beschriebene hydraulische Aufbau der bevorzugten Steueranordnung der Erfindung entspricht im Wesentlichen dem Schaltungsaufbau der Steueranordnung der
Wie aus der
Schließlich sind in der
Im vorliegenden Ausführungsbeispiel ist das dem ersten externen Steuerblock 20 zugeordnete hydraulisch betätigte Schaltventil ZV2 in die Kurzschlussleitung 16 dem elektromagnetischen Schaltventil ZVA unmittelbar nachgeschaltet, wobei dessen einer Eingangsanschluss mit dem Ausgangsanschluss des elektromagnetischen Schaltventils ZVA verbunden ist und dessen zweiter Eingangsanschluss über eine unmittelbar vorgeschaltete, vorzugsweise verstellbare Drossel D4 mit der Kurzschlussleitung 16 stromauf zur Drossel D3 verbunden ist (d.h. unmittelbar mit der pumpendruckbeaufschlagten Steuerseite der Druckwaage 1). Ferner ist das dem zweiten externen Steuerblock 22 zugeordnete externe hydraulisch betätigte Schaltventil ZV3 in die Kurzschlussleitung 16 dem externen hydraulisch betätigten Schaltventil ZV2 des ersten externen Steuerblocks 20 unmittelbar nachgeschaltet, wobei dessen einer Eingangsanschluss mit dem Ausgangsanschluss des externen hydraulisch betätigten Schaltventils ZV2 des ersten externen Steuerblocks20 verbunden ist und dessen zweiter Eingangsanschluss über eine unmittelbar vorgeschaltete, vorzugsweise verstellbare Drossel D5 mit der Kurzschlussleitung 16 stromauf zur Drossel D3 verbunden ist (d.h. unmittelbar mit der pumpendruckbeaufschlagten Steuerseite der Druckwaage 1). Die eine Steuerseite beider externen hydraulisch betätigten Schaltventile ZV2, ZV3 ist federvorgespannt, wobei die andere Steuerseite jeweils mit dem Verbrauchdruck des ersten, bzw. des zweiten externen Steuerblocks 20, 22 beaufschlagt sind.In the present exemplary embodiment, the hydraulically actuated switching valve ZV2 assigned to the first
An dieser Stelle sei darauf hingewiesen, dass die Reihenfolge der seriell angeordneten externen hydraulisch betätigten SchaltventileZV2, ZV3 nicht beliebig ist, sondern dem erforderlichen Druckgefälle der externen Steuerblöcke 20, 22 im Verbraucherbetrieb entspricht. In anderen Worten ausgedrückt, ist das hydraulisch betätigte Schaltventil ZV2 des ersten externen Steuerblocks 20 mit dem niedrigeren Druckgefälle unmittelbar dem elektromagnetischen Schaltventil ZVA nachgeordnet und wird vom hydraulisch betätigten Schaltventil Z3 des zweiten Steuerblocks 22 mit höherem Druckgefälle gefolgt und so weiter.It should be noted at this point that the order of the serially arranged external hydraulically actuated switching valves ZV2, ZV3 is not arbitrary, but corresponds to the required pressure drop of the external control blocks 20, 22 in the consumer mode. In other words, the hydraulically operated switching valve ZV2 of the first external
Die Funktionsweise der erfindungsgemäßen Steueranordnung des bevorzugten Ausführungsbeispiels wird nachfolgend erläutert:The operation of the control arrangement according to the invention of the preferred embodiment is explained below:
- Alle Verbraucher sind in Neutralstellung.All consumers are in neutral position.
- Das Magnetventil ZVA ist nicht aktiviert (vorzugsweise nicht bestromt).The solenoid valve ZVA is not activated (preferably not energized).
In diesem Steuerzustand ist die Verbraucherdruck-Hauptleitung 6 drucklos, da der Steuerölstrom in der Verbraucherdruckleitung 6 über die manuell betätigbaren Schaltventile 12 in den Druckmitteltank 4 entspannt wird. Des Weiteren ist die Kurzschlussleitung 16 zwischen den zwei Steuerseiten x, y der Druckwaage 1 gesperrt, da das zwischengeschaltete hydraulisch gesteuerte Schaltventil ZV1 in Ermangelung eines Verbraucherdrucks nicht aktiviert ist. In diesem Fall ist das Regeldruckgefälle ausschließlich von der Federkraft der Vorspannfeder an der Druckwaage 1 abhängig, das entsprechend der Auswahl der Federkraft auf einen niedrigen Wert eingestellt ist.In this control state, the consumer pressure
- Magnetventil ZVA nicht aktiviert (nicht bestromt)Solenoid valve ZVA not activated (not energized)
- Externe Verbraucher nicht betätigtExternal consumers not actuated
Beim Aktivieren eines oder mehrerer (interner) Verbraucher durch manuelles Betätigen der entsprechenden internen Schaltventile 12 im internen Steuerblock wird die Verbindung der Verbraucherdruck-Hauptleitung 6 zum Druckmitteltank 4 gesperrt und das Verbraucherdrucksignal über die Auswahl an den Wechselventilen (Signal mit dem höchsten Druckwert) über die Drossel D1 an die federvorgespannte Steuerseite y der Druckwaage 1 angelegt. Dadurch schließt die Druckwaage 1, wodurch der Pumpendruck nicht mehr über die Druckwaage 1 in den Tank 4 entspannt wird, d.h. der Systemdruck steigt an.When one or more (internal) consumers are activated by manual actuation of the corresponding
Beim Erreichen eines vorbestimmten Einstelldrucks der am hydraulisch gesteuerten Schaltventil ZV 1 vorzunehmenden ΔP-Umschaltung öffnet das Schaltventil ZV1 die Kurzschlussleitung 16. Dadurch fließt der Steuerölstrom von der Pumpe 2 zu der federvorgespannte Steuerseite y der Druckwaage 1 über die Serienschaltung der Drosseln (Blenden) D2, D3. Durch eine geeignete Blendenvariation der Drossel D3 ändert sich die Druckbeaufschlagung der federvorgespannten Steuerseite y der Druckwaage 1, derart, dass im Resultat eine Federverstärkung, d.h. ein höheres RegelDruckgefälle entsteht. Dies wiederum hat zur Folge, dass ein größerer Ölstrom zum Verbraucher geleitet werden kann.Upon reaching a predetermined set pressure of the to be performed on the hydraulically controlled switching valve ZV 1 ΔP switching the switching valve ZV1 opens the short-
- alle Verbraucher in Neutralstellungall consumers in neutral position
- Magneltventil ZVA aktiviert (bestromt)Magnetic valve ZVA activated (energized)
Gemäß der
Der nunmehr erhöhte Neutralumlaufdruck wird benötigt, um externe Verbraucher, beispielsweise Magnetventile mit höherem Ansteuerdruck, ansteuern zu können. Dieser Druck muss demzufolge so hoch gewählt werden, dass die externen Verbraucher sicher schalten, aber so niedrig wie möglich, damit die Druckmittelerwärmung in einem zulässigen Rahmen bleibt.The now increased neutral circulation pressure is required to control external consumers, such as solenoid valves with higher control pressure. Consequently, this pressure must be set so high that the external consumers switch safely, but as low as possible so that the pressure medium heating remains within a permissible range.
- Magnetventil ZVA aktiviert (bestromt)Solenoid valve ZVA activated (energized)
- Interne Verbraucher betätigt/nicht betätigtInternal consumers actuated / not actuated
Durch die Aktivierung des Magnetventils ZVA liegt, wie vorstehend bereits unter Punkt 3 beschrieben wurde, ein erhöhter Neutralumlaufdruck an, der das Schalten der externen Verbraucher ermöglicht.By activating the solenoid valve ZVA is, as already described above under point 3, an increased neutral circulation pressure, which allows the switching of external consumers.
Zum Betrieb dieser externen Verbraucher ist ggf. ein erhöhtes Regeldruckgefälle als das unter Punkt 2. beschriebene Regedruckgefälle erforderlich. Dies wird realisiert durch das Schalten des hydraulisch betätigten Schaltventils ZV2, ermöglicht durch den Verbraucherdruck des externen ersten Steuerblocks 20, der im übrigen auch über das geschaltete externe Wechselventil WSV-EX zur Druckwaage 1 (an dessen federvorgespannte Steuerseite y) gelangt. Gleichzeitig schaltet dieser Verbraucher- bzw. Steuerdruck das Schaltventil ZV2. In diesem Fall ist die Reihenschaltung der Drosseln (Blenden) D2 und D4 aktiv. Mittels einer geeigneten Blendenvariation an der Blende D4 lässt sich somit die zum Betreiben des externen ersten Steuerblocks 20 erforderliche Regeldruckerhöhung einstellen.For the operation of these external consumers, an increased control pressure gradient may be required as the recirculation pressure differential described under
- Magnetventil ZVA aktiviert (vorzugsweise durch Bestromung)Solenoid valve ZVA activated (preferably by energization)
- Interne Verbraucher betätigt/nicht betätigtInternal consumers actuated / not actuated
Zur Betätigung des externen zweiten Steuerblocks 22 gilt im Wesentlichen das Gleiche, wie vorstehend unter Punkt 4 beschrieben wurde, jedoch mit der Maßgabe, dass das Regeldruckgefälle in diesem Fall auf einen noch höheren Wert justiert worden ist. Das hierfür erforderliche höhere Steuerdrucksignal wird am Wechselventil WSV-EX ausgewählt und zur Druckwaage 1 (an deren federvorgespannte Steuerseite y) geleitet. Gleichzeitig schaltet das hydraulisch betätigte Schaltventil ZV3 durch den zugeführten Verbraucherdruck aus dem externen zweiten Steuerblock 22 und aktiviert so die Blendenreihe D2 und D5. Mittels einer geeigneten Blendenvariation an der Blende D5 kann das noch höhere Regeldruckgefälle für den externen zweiten Steuerblock 22 eingestellt werden.To operate the external
Beim Deaktivieren der externen Steuerblöcke 20, 22 sinkt das Regeldruckgefälle auf den erhöhten Neutralumlaufdruck gemäß der unter Punkt 3. gegebenen Beschreibung. Wird nun auch das Magnetventil ZVA deaktiviert (entstromt), so schließt dieses, d.h. es sperrt die Bypassleitung 18 und aktiviert somit die Blendenreihe D2 und D3. Damit sinkt der Neutralumlaufdruck auf den, mittels der Vorspannfeder eingestellten niedrigeren Neutralumlaufdruck.When deactivating the external control blocks 20, 22, the control pressure drop decreases to the increased neutral circulation pressure according to the description given under point 3. If now also the solenoid valve ZVA deactivated (de-energized), so this includes, i. it blocks the
Claims (8)
- Hydraulic control arrangement having an inlet pressure balance composed of a proportional directional valve (1), one control side (y) of which is acted on with a throttled consumer load pressure and by a preload spring, and the other control side (x) of which is acted on with a throttled pump pressure, and having a hydraulically controlled switching valve (ZV1) for the selected throttled connection of the two control sides (x, y) of the proportional directional valve (1), characterized by an electromagnetic switching valve (ZVA) which selectively opens a bypass line (18) past the hydraulically actuated switching valve (ZV1) in order to forcibly activate a throttled bypass connection between the two control sides (x, y) of the proportional directional valve (1).
- Hydraulic control arrangement according to Claim 1, characterized in that the electromagnetic switching valve (ZVA) is a 2-position/3-way switching valve with an outlet port, which is connected to the spring-preloaded control side (y) of the proportional directional valve (1), with a first inlet port, which is connected to the hydraulically actuated switching valve (ZV1), and with a second inlet port, which is connected via the bypass line (18) to the control side (x), which is acted on by the throttled pump pressure, of the proportional directional valve (1), wherein the electromagnetic switching valve (ZVA) selectively connects its inlet ports in each case to its outlet port.
- Hydraulic control arrangement according to one of the preceding claims, characterized in that a preferably adjustable throttle (DA) is connected upstream of the electromagnetic switching valve (ZVA) in the bypass line (18).
- Hydraulic control arrangement according to one of the preceding claims, characterized in that a preferably adjustable throttle (D3) is connected upstream of the hydraulically actuated switching valve (ZV1) in a line portion which is bypassed by the bypass line (18).
- Hydraulic control arrangement according to one of the preceding claims, characterized by a number of consumers which can be actuated in each case by means of an external control block (20, 22), said external control blocks being connected in each case to a pump pressure line (24) and to a consumer pressure line (26, 28), which leads to the pressure balance (1), via a shuttle valve (30).
- Hydraulic control arrangement according to Claim 5, characterized in that, corresponding to the number of external control blocks (20, 22), a number of hydraulically actuated 2-position/3-way switching valves (ZV2, ZV3) are interconnected in series in a short-circuit line (16) between the electromagnetic switching valve (ZVA) and the pressure balance (1), the outlet port of said switching valves being connected in each case to one inlet port of the respectively subsequent switching valve, the other inlet port of said switching valves being connected via in each case one external branch line to the control side (x), which is acted on with throttled pump pressure, of the pressure balance (1), and in each case one control side of which switching valves being connected to the consumer pressure line (26, 28) of the respectively associated control block (20, 22).
- Hydraulic control arrangement according to Claim 6, characterized in that, in each external branch line, a preferably adjustable throttle (D4, D5) is connected upstream of the respective hydraulically actuated switching valve (ZV2, ZV3).
- Hydraulic control arrangement according to one of the preceding claims, characterized in that the pressure balance (1) is integrated into an internal control block in which there are arranged a number of manually actuable switching valves (12) for the activation of internal consumers, wherein, from each manually actuable switching valve (12), a consumer pressure line (14) leads to the springpreloaded control side (y) of the pressure balance (1), directly upstream of which in the consumer line there is connected a throttle (D1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910052077 DE102009052077A1 (en) | 2009-11-05 | 2009-11-05 | Hydraulic control arrangement with variable via a LS-valve control pressure drop |
PCT/EP2010/005460 WO2011054408A1 (en) | 2009-11-05 | 2010-09-06 | Hydraulic control arrangement with a regulating pressure gradient which can be varied via an ls-valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2496843A1 EP2496843A1 (en) | 2012-09-12 |
EP2496843B1 true EP2496843B1 (en) | 2013-11-06 |
Family
ID=43242607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10752313.6A Not-in-force EP2496843B1 (en) | 2009-11-05 | 2010-09-06 | Hydraulic control arrangement with a regulating pressure gradient which can be varied via an ls-valve |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2496843B1 (en) |
BR (1) | BR112012010582A8 (en) |
DE (1) | DE102009052077A1 (en) |
WO (1) | WO2011054408A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015212556A1 (en) * | 2015-07-06 | 2017-01-12 | Robert Bosch Gmbh | Control device with pump pressure balance and pilot pressure balance |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE9300084L (en) * | 1993-01-14 | 1994-04-18 | Voac Hydraulics Boraas Ab | Procedure for controlling a hydraulic motor, as well as hydraulic valve for this |
DE10011936A1 (en) * | 2000-03-11 | 2001-09-13 | Bosch Gmbh Robert | Hydraulic controler has control element in form of longitudinal sliding element, pressure divider circuit connected into control line downstream of longitudinal sliding element |
DE102004005606B3 (en) * | 2004-02-05 | 2005-10-06 | Hydac Fluidtechnik Gmbh | circuitry |
-
2009
- 2009-11-05 DE DE200910052077 patent/DE102009052077A1/en not_active Withdrawn
-
2010
- 2010-09-06 WO PCT/EP2010/005460 patent/WO2011054408A1/en active Application Filing
- 2010-09-06 EP EP10752313.6A patent/EP2496843B1/en not_active Not-in-force
- 2010-09-06 BR BR112012010582A patent/BR112012010582A8/en not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015212556A1 (en) * | 2015-07-06 | 2017-01-12 | Robert Bosch Gmbh | Control device with pump pressure balance and pilot pressure balance |
Also Published As
Publication number | Publication date |
---|---|
DE102009052077A1 (en) | 2011-05-12 |
WO2011054408A1 (en) | 2011-05-12 |
BR112012010582A2 (en) | 2016-03-22 |
BR112012010582A8 (en) | 2016-10-04 |
EP2496843A1 (en) | 2012-09-12 |
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