EP2597209B1 - Electronic-hydraulic hoisting gear regulation system - Google Patents

Electronic-hydraulic hoisting gear regulation system Download PDF

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Publication number
EP2597209B1
EP2597209B1 EP11190345.6A EP11190345A EP2597209B1 EP 2597209 B1 EP2597209 B1 EP 2597209B1 EP 11190345 A EP11190345 A EP 11190345A EP 2597209 B1 EP2597209 B1 EP 2597209B1
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European Patent Office
Prior art keywords
pressure
valve
pump
lifting
electronic
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German (de)
French (fr)
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EP2597209A1 (en
Inventor
Recep Macit
Martin Ascherl
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Hawe Hydraulik SE
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Hawe Hydraulik SE
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2296Systems with a variable displacement pump
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2203Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2221Control of flow rate; Load sensing arrangements
    • E02F9/2232Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E02F9/2235Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/006Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/05Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
    • F15B11/055Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive by adjusting the pump output or bypass
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20546Type of pump variable capacity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/305Directional control characterised by the type of valves
    • F15B2211/3056Assemblies of multiple valves
    • F15B2211/30565Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/30575Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/31Directional control characterised by the positions of the valve element
    • F15B2211/3144Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/32Directional control characterised by the type of actuation
    • F15B2211/327Directional control characterised by the type of actuation electrically or electronically
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/50Pressure control
    • F15B2211/505Pressure control characterised by the type of pressure control means
    • F15B2211/50509Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/605Load sensing circuits
    • F15B2211/6051Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6057Load sensing circuits having valve means between output member and the load sensing circuit using directional control valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051Linear output members
    • F15B2211/7052Single-acting output members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/77Control of direction of movement of the output member
    • F15B2211/7741Control of direction of movement of the output member with floating mode, e.g. using a direct connection between both lines of a double-acting cylinder

Description

  • Die Erfindung betrifft ein elektronisch-hydraulisches Hubwerksregelsystem gemäß Oberbegriff des Patentanspruchs 1. The invention relates to an electronic-hydraulic Hubwerksregelsystem according to the preamble of claim 1.
  • Bei dem aus In the out EP 2 031 256 A EP 2031256 A bekannten Hubwerksregelsystem ist ein Vierstellungs-Vierwege-Schieberventil mit zwei Proportionalmagneten und zwei Druckvorsteuerungen vorgesehen, dem zwecks Lastdruckunabhängigkeit pumpenseitig eine Zulaufregler-Druckwaage und auf der Seite des Hubwerks-Hubzylinders eine Heben-Druckwaage und eine Senken-Druckwaage zugeordnet sind. known Hubwerksregelsystem is provided with two proportional magnets and two pressure precontrols provided a four-position four-way spool valve, the and on the side of the hoist lifting cylinder a lifting-pressure balance, and a drain pressure scale associated with the purpose of load pressure independence of the pump side an inlet regulator pressure compensator. Im Falle eines einfach wirkenden Hubzylinders ist dessen Hebenseite ein durch einen Proportionalmagneten steuerbares Druckbegrenzungsventil zum Rücklauf zugeordnet. In the case of a single-acting lift cylinder whose lifting side is associated with a controllable by a proportional solenoid pressure relief valve to the return. Neben multiplen EHR-Funktionen ist eine Schwimmstellungsfunktion für den Hubzylinder in einer der dafür vorgesehenen vier Steuerstellungen des 4/4-Schieber-Druckregelventils einstellbar. In addition to multiple EHR functions a floating position function for the lifting cylinder in one of the designated four control positions of the 4/4-vane pressure control valve is adjustable. Für einen einfach wirkenden Hubzylinder ist hierbei der bauliche Aufwand insbesondere mit dem leckagebehafteten Vierstellungs-Schieberventil enorm. For a single-acting lifting cylinder here is the structural complexity especially with the leak-prone four-position slide valve enormous.
  • Weiterer Stand der Technik zu elektronisch-hydraulischen Hubwerksregelsystemen ist zu finden in Further prior art to electronic-hydraulic Hubwerksregelsystemen can be found in DE 10 2005 005 314 A DE 10 2005 005 314 A und einem bereits im and one already in , wobei darin das mit zwei Proportionalmagneten betätigbare Druckregelventil für den jeweils einfach wirkenden Hubzylinder eines Front- und eines Heckhubwerks jeweils ein baulich aufwändiges, leckagebehaftetes Dreistellungs-Dreiwege-Schieberventil ist. Wherein the actuatable therein with two proportional solenoid pressure control valve for the single-acting lift cylinder, respectively a front and a rear linkage are each a structurally elaborate, leak-prone three-position three-way slide valve.
  • In der europäischen Patentanmeldung mit dem Aktenzeichen In the European patent application with the file reference 10 195 693.6 10,195 693.6 mit älterem Zeitrang wird für ein elektronisch-hydraulisches Hubwerksregelsystem für einen einfach wirkenden Hubzylinder vorgeschlagen, jeweils von einem Proportionalmagneten über eine Druckvorsteuerung betätigte, lastdruckunabhängig regelnde 2/2-Druckregelventile in Sitzventilbauweise für die EHR-Funktionen zu verwenden. with earlier priority is proposed for an electronic-hydraulic Hubwerksregelsystem for a single-acting lifting cylinders, operated by a respective proportional magnet through a pressure pilot control, load pressure independent regulatory 2/2-pressure control valves in poppet valve construction for the EHR functions to use. Eine Schwimmstellungsfunktion wird nicht offenbart. A floating position function is not disclosed. Ein Lastdrucksignalkreis-Abschnitt ist direkt mit der Versorgungsregelung der Pumpe verbunden. A load pressure signal circuit section is connected directly to the supply control of the pump.
  • Weiterer Stand der Technik ist zu finden in: Further prior art can be found in: US 2009/050222 A1 US 2009/050222 A1 , . US 6 397 655 B1 US 6,397,655 B1 , . US 2004/188113 A1 US 2004/188113 A1 und and DE 203 17 749 U1 DE 203 17 749 U1 . ,
  • Der Erfindung liegt die Aufgabe zugrunde, ein elektronisch-hydraulisches Hubwerksregelsystem der eingangs genannten Art, dh mit vielen verschiedenen EHR-Funktionen, trotz auch einer Schwimmstellungsfunktion baulich einfach und schnell ansprechend auszubilden. The object of the invention is to provide a electronic-hydraulic Hubwerksregelsystem of the aforementioned type, ie with many different EHR functions, despite even a floating position function structurally simple and quick response form.
  • Die gestellte Aufgabe wird mit den Merkmalen des Patentanspruchs 1 gelöst. The object is achieved with the features of claim 1.
  • Da die beiden Druckregelventile trotz leckagefreier Absperrstellung strikt lastdruckunabhängig regeln, lassen sich alle üblichen EHR-Funktionen ausführen, wobei der bauliche Aufwand gering ist und wegen weniger Drosselstellen und einfacher und direkter Strömungswege im System rasches Ansprechverhalten zumindest bei vom Steuergerät initiierten Funktionsänderungen sichergestellt ist. Since the two pressure control valves regulate strictly independent of the load despite leak-free shut-off, all the usual EHR functions can be executed, the construction cost is low and because of fewer constrictions and simple and direct flow paths in the system quick response at least in initiated by the controller function changes is ensured. Die Schwimmstellungsfunktion wird über das Steuergerät am 2/2-Senken-Druckregelventil eingestellt, wobei dann gleichzeitig das 2/2-Schwarz/Weiß-Magnetventil den Lastdrucksignalkreis-Abschnitt absperrt, um unerwünschte Reaktionen des Hubwerksregelsystems und/oder der Pumpe, bedingt durch Lastdrucksignaleinflüsse, auszuschließen. The floating position function is set via the control unit on the 2/2-sink pressure control valve, in which case at the same time the 2/2-black / white solenoid valve shuts off the load pressure signal circuit section to undesirable reactions of the Hubwerksregelsystems and / or the pump, due to load pressure signal influences, excluded. Die auf diese Weise über das EHR-Steuergerät wählbare Schwimmstellungsfunktion ermöglicht es beispielsweise, ein Anbaugerät am Hubwerk, wie einen Pflug, Schneepflug oder ein Mähwerk, unter dem gesamten oder einem Teil des Eigengewichts Bodenunebenheiten in Bodenkontakt folgen zu lassen, und zwar unabhängig von Relativbewegungen des Fahrzeugkörpers des mit dem Hubwerk ausgestatteten Fahrzeugs. The in this way via the EHR controller selectable floating position function allows, for example, an attachment to the hoist, such as a plow, snow plow or a mower to follow up with all or a part of the self-weight ground unevenness in contact with the ground, regardless of relative movements of the body of the vehicle equipped with the lifting mechanism, the vehicle.
  • Zweckmäßig ist das Magnetventil im Signalkreis-Abschnitt als Sitzventil ausgebildet und so verschaltet, dass bei stromlosem Schwarz/Weiß-Magneten die Durchgangsstellung durch die Schließfeder eingestellt und gehalten wird. Suitably, the solenoid valve in the signal circuit portion is formed as a seat valve and connected such that, when energized black / white magnet, the passage position is adjusted by the closing spring and held. Die Absperrstellung ergibt sich bei über das Steuergerät gewählter Schwimmstellungsfunktion mit bestromtem Schwarz/Weiß-Magneten. The shut-off arises in via the control device selected floating position function with energized black / white magnet. In der Absperrstellung ist Leckagefreiheit in einer oder in beiden Strömungsrichtungen gegeben. In the shut-off leakage of freedom is given in one or in both directions of flow. Alternativ könnte das Magnetventil umgekehrt betätigt werden. Alternatively, the magnetic valve could be operated in reverse.
  • Bei einer zweckmäßigen Ausführungsform ist das 2/2-Heben-Druckregelventil bei maximaler Bestromung des Proportionalmagneten bis in eine zumindest im Wesentlichen ungedrosselte Durchgangsstellung bringbar, um bei der Hebensteuerung so wenig Drosselverluste wie möglich zu haben. In an expedient embodiment, the 2/2-pressure regulating valve lift-up in an at least substantially unrestricted passage position can be brought at the maximum current supplied to the proportional magnet in order to have as little throttling losses as possible to the lift control. Hingegen ist das 2/2-Senken-Druckregelventil mit zunehmender Bestromung des Proportionalmagneten ausschließlich in gedrosselte Durchgangsstellungen bringbar, beispielsweise um eine wünschenswerte hydraulische Dämpfung zu erzeugen, oder, vorzugsweise, in einem Regenerativbetrieb aus Lastbewegungen hydraulische Druckenergie in einen Druckspeicher zurückzuspeisen oder, vorzugsweise, eine Geschwindigkeitsbegrenzung zu erzielen. By contrast, the 2/2-sink pressure control valve with increasing energization of the proportional magnet can be brought only in throttled passage positions to generate a desirable hydraulic damping, for example, or, preferably, hydraulic pressure energy back in a regenerative operation from load movements in an accumulator or, preferably, a to achieve speed limit.
  • Die Pumpe in der Pumpe/Rücklauf-Anordnung kann eine Verstellpumpe oder eine Konstantpumpe sein. The pump in the pump / reverse arrangement may be a variable or a fixed displacement pump. Die Verstellpumpe wird aus dem Lastdrucksignalkreis bzw. Lastdrucksignalkreis-Abschnitt so geregelt, dass mit steigendem Lastdrucksignal eine höhere Fördermenge bereitgestellt und bei Ausbleiben des Lastdrucksignals bis auf eine minimale Fördermenge abgeregelt wird. The variable displacement pump is controlled from the load pressure signal circuit or load pressure signal circuit portion so that is provided with an increasing load pressure signal has a higher flow rate and governed in the absence of load pressure signal to a minimum discharge. Die Konstantpumpe kann als Versorgungsregelung eine Umlaufschaltung gegebenenfalls mit einem Druckwaagenventil enthalten, die die Fördermenge entweder direkt zum Rücklauf abströmen lässt oder an den Bedarf angepasst die Fördermenge bzw. den Druck für den Hubzylinder bereitstellt. The fixed displacement pump, a circulation circuit, optionally, as a supply arrangement with a pressure balance valve, which can flow out either directly to the return line, the delivery or to the needs of the delivery rate or the pressure for the lifting cylinder adapted to provide.
  • Um den Hubzylinder hydraulisch blockieren zu können, beispielsweise bei abgeschalteter Pumpe, ist es zweckmäßig, wenn stromab des 2/2-Heben-Druckregelventils ein in Richtung zur Pumpe sperrendes Rückschlagventil angeordnet ist. In order to block the lifting cylinder hydraulically, for example when the pump, it is advantageous if a blocking towards the pump check valve is disposed downstream of the 2/2-lifting pressure control valve.
  • Um die Energiebilanz des Systems zu verbessern, ist ferner zweckmäßig an eine Umgehungsleitung des 2/2-Heben-Druckregelventils zwischen der Pumpe und dem Knoten ein Druckspeicher angeschlossen, der durch eine Feder oder durch Gasdruck vorgespannt ist, ein bestimmtes unter Druck gesetztes Entnahmevolumen bereitstellt und Energie rückgewinnen lässt, wenn er bei abgeschalteter oder abgeregelter Pumpe mit dem Lastdruck geladen wird. In order to improve the energy balance of the system is also advantageous to connect a pressure accumulator of a bypass passage of the 2/2-lifting pressure regulating valve between the pump and the node which is biased by a spring or gas pressure, providing a specific pressurized withdrawal volume and can recover energy when it is loaded with disconnected or abgeregelter pump to the load pressure. Gespeicherte hydraulische Druckenergie entlastet die Pumpe. Stored hydraulic pressure energy relieves the pump.
  • Im Falle eines Druckspeichers ist zweckmäßig stromauf der Umgehungsleitung ein in Richtung zur Pumpe sperrendes Rückschlagventil angeordnet, um den Druckspeicher nicht nur durch die Pumpe, sondern auch aus dem Lastdruck laden zu können, und ist in der Umgehungsleitung stromauf des Knotens ein in Richtung zum Knoten sperrendes Rückschlagventil angeordnet, um das selbsttätige Entladen des Druckspeichers bzw. Verstellen des Hubzylinders ohne Einflussnahme des elektronisch-hydraulischen Hubwerkregelsystems zu vermeiden. In the case of a pressure accumulator, a blocking in the direction of the pump check valve is advantageously upstream of the bypass line arranged to be able to load the accumulator, not only through the pump, but also the load pressure, and is in the bypass line of the node upstream of a in the direction of the node-locking non-return valve arranged to prevent the automatic unloading of the accumulator or readjustment of the lifting cylinder without the influence of the electronic-hydraulic Hubwerkregelsystems.
  • Da bei eingestellter Schwimmstellungsfunktion eine Lastrichtungsumkehr am Hubwerk nicht ausgeschlossen werden kann, ist es zweckmäßig, wenn das 2/2-Senken-Druckregelventil als in Richtung zur Hebenseite des Hubzylinders öffnendes Nachsaug-Rückschlagventil fungiert. Since the set floating position function is a load reversal on the lifting gear can not be excluded, it is convenient when the 2/2-sink pressure control valve acts as a opening in the direction to the lifting side of the lifting cylinder After suction-check valve. Kommt es zu einer Lastrichtungsumkehr am Hubwerk, dh mit einer das Hubwerk hebend beaufschlagenden Last, dann wird zur Hebenseite des Hubzylinders Druckmittel aus dem Rücklauf nachgesaugt. If there is a load reversal on the lifting gear, ie with the hoist lifting acting load, pressure medium is sucked from the return for the lifting side of the lifting cylinder.
  • Da für unterschiedlichste EHR-Regelfunktionen und deren einwandfreie Regelung eine weitestgehend ideale Lastdruckunabhängigkeit wichtig ist, ist es zweckmäßig, wenn in der jeweiligen Druckvorsteuerung bei Bestromen des zugeordneten Proportionalmagneten aus dem Lastdruck an der Hebenseite des Hubzylinders eine dem Lastdruck proportionale und gegen die Betätigungskraft des Proportionalmagneten wirkenden Stellkraft hydraulisch erzeugbar ist, die dem Proportionalmagneten eine Rückmeldung über die tatsächlich vorliegende Lastdrucksituation gibt, so dass das Druckregelventil im Zusammenspiel der Druckvorsteuerung und der Stellkraft lastdruckunabhängig wirkt. Since a largely ideal load pressure independence is important for a variety of EHR control functions and their proper control, it is advantageous if in each pilot pressure control for supplying current to the associated proportional magnet from the load pressure on the lifting side of the lifting cylinder produces a proportional load pressure and acting against the operating force of the proportional magnet force is hydraulically generated, which gives the proportional solenoid feedback about the actual present load pressure situation so that the pressure control valve in the interaction of pressure predominance and the force acting load pressure independent. Die Stellkraft kann in der Druckvorsteuerung beispielsweise über eine vom Proportionalmagneten verstellbare Verstelldrossel direkt am Proportionalmagneten erzeugt werden, wobei die Verstelldrossel baulich einfach in die Druckvorsteuerung eingegliedert werden kann. The restoring force can be generated in the pilot pressure control, for example, an adjustable proportional solenoid variable throttle from the right on the proportional magnet, wherein the variable throttle can be structurally simple incorporated in the pilot pressure control. Solche lastunabhängig arbeitenden 2/2-Druckregelventile in Sitzventilbauweise sind beispielsweise bekannt aus Such load-independent operating 2/2-pressure regulating valve in a seat valve construction are known from e.g. EP 2 270 340 A EP 2270340 A , deren Gesamtoffenbarung hiermit durch Rückbeziehung inkorporiert wird. Whose entire disclosure is hereby incorporated by back-reference.
  • Ausführungsformen des Erfindungsgegenstandes werden anhand der Zeichnungen erläutert. Embodiments of the invention will be explained with reference to the drawings. Es zeigen: Show it:
  • Fig. 1 Fig. 1
    eine Schemadarstellung eines Hubwerks, kombiniert mit einem Blockschaltbild eines Hauptteiles eines elektronisch-hydraulischen Hubwerksregelsystems EHR, in stromlosem Zustand, und a schematic of a hoist, combined with a block diagram of a main part of an electronic-hydraulic Hubwerksregelsystems EHR, in currentless state, and
    Fig. 2 Fig. 2
    eine durch einen integrierten Druckspeicher mit Energierückgewinnung betreibbare Ausführungsform. an operable by an integrated accumulator with energy recovery embodiment.
  • Fig. 1 Fig. 1 verdeutlicht als Blockschaltbild einen Hauptteil eines elektronisch-hydraulischen Hubwerksregelsystems E eines nicht näher dargestellten Fahrzeugs, das beispielsweise hinter einer Hinterachse oder vor einer Vorderachse 2 mit einem Hubwerk 1 ausgestattet ist (Fronthubwerk oder Heckhubwerk). illustrates in block diagram a main portion of an electronic-hydraulic Hubwerksregelsystems E of a vehicle, not shown, which is equipped, for example, behind a rear axle or in front of a front axle 2 with a lifting gear 1 (front lift or rear linkage). Das Hubwerk 1 weist zB nach Art einer Dreipunkthebevorrichtung Oberlenker 3, Unterlenker 4 und Zwischenlenker 6 auf, wobei am Unterlenker 4 eine Anbringungsstelle 5 für beispielsweise ein Anbaugerät, wie einen Pflug, ein Mähwerk oder dgl., vorgesehen ist. The lifting mechanism 1 comprises, for example, on the manner of a three-point lifting device upper link 3, lower link 4 and intermediate link 6, wherein an attachment point 5 is provided for example an implement such as a plow, a mower or the like. At the lower links 4. Das Hubwerk 1 wird mit wenigstens einem einfach wirkenden Hubwerks-Hubzylinder Z betrieben, an dessen Hebenseite 8 eine Arbeitsleitung 7 angeschlossen ist. The lifting mechanism 1 is operated with at least one single-acting hoist lifting cylinder Z, at the lifting side 8 a working line 7 is connected.
  • Mit dem elektronisch-hydraulischen Hubwerksregelsystem E sind ua multiple EHR-Regelfunktionen ausführbar, die üblicherweise eine Lageregelung, eine Zugkraftregelung, eine Mischregelung, eine Schlupfregelung, eine Druckregelung, eine Anpresskrafteinstellung, eine Schwingungsdämpfung, eine externe Regelung, gegebenenfalls eine Wiegefunktion und dgl. in dem Fahrzeug ermöglichen, zuzüglich einer Schwimmstellungsfunktion, die beispielsweise gebraucht wird, damit ein Anbaugerät am Hubwerk in Bodenkontakt Bodenunebenheiten unabhängig von Fahrbewegungen des Fahrzeuges problemlos zu folgen vermag, und zwar unter dem vollen Eigengewicht oder unter einem einstellbaren Anteil des Eigengewichts. With the electronic-hydraulic Hubwerksregelsystem E multiple EHR control functions include executable, usually like a position control, a traction control, a mixing control, a traction control, a pressure control, a Anpresskrafteinstellung, vibration damping, external control, optionally a weighing function and, in the vehicle make, plus a floating position function, which is for example used to make an attachment on the lifting gear can in contact with the ground floor unevenness regardless of movements of the vehicle easily to follow, under the full weight or below an adjustable proportion of the own weight.
  • Das elektronisch-hydraulische Hubwerksregelsystem E wird versorgt aus einer Pumpe/Rücklaufanordnung 9 mit einer Pumpe 10, im Ausführungsbeispiel einer Verstellpumpe, und einem Druckmittel bereithaltenden Rücklauf 13. Der Pumpe 10 ist eine Versorgungsregelung 11 zugeordnet, die in einen nicht dargestellten Lastdrucksignalkreis eingegliedert sein kann, und in der gezeigten Ausführungsform an einen Lastdrucksignalkreis-Abschnitt 36 angeschlossen ist und zB die Fördermenge bzw. den Druck in einer Versorgungsleitung 12 ausgangs der Pumpe 10 bedarfsabhängig einstellt. The electronic-hydraulic Hubwerksregelsystem E is supplied from a pump / reverse arrangement 9 with a pump 10, in the exemplary embodiment of a variable displacement pump, and ready retaining a pressure medium return line 13. The pump 10 is a power supply controller 11 assigned, which can be incorporated in a non-illustrated load pressure signal circuit, and is connected in the embodiment shown, to a load pressure signal circuit section 36 and for example the delivery rate or the pressure in a supply line 12 output of the pump 10 is adjusted as required.
  • Alternativ könnte die Pumpe 10 eine Konstantpumpe sein, deren Versorgungsregelung 11 beispielsweise eine Umlaufsteuerung mit einer Druckwaage aufweist, die abhängig vom Lastdrucksignal Fördermenge entweder in den Rücklauf 13 abströmen lässt oder die Fördermenge bzw. den Druck bedarfsabhängig bereitstellt. Alternatively, the pump 10 could be a fixed displacement pump whose supply controller 11 has, for example, a circulation control with a pressure compensator, which can be dependent on the load pressure signal flow either into the return line 13 to flow off, or level of providing the flow rate or the pressure.
  • Das elektronisch-hydraulische Hubwerksregelsystem E weist wenigstens ein elektronisches Steuergerät CU auf, das eine Eingabesektion 14 besitzen kann, und über Leitungen 15 an diverse Sensoren (nicht gezeigt) im Fahrzeug, Hubwerk 1 oder am Anbaugerät angeschlossen ist. The electronic-hydraulic Hubwerksregelsystem E has at least an electronic control unit CU, which may have an input section 14, and via lines 15 to various sensors (not shown) in the vehicle, or lifting mechanism 1 is connected to the attachment. Die Sensoren können Drehzahl- oder Geschwindigkeitssensoren, Kraftsensoren, Lagesensoren und dgl. sein. The sensors may be speed or velocity sensors, force sensors, position sensors and the like.. Über Leitungen 16 ist ferner das Steuergerät CU mit elektrischen Komponenten der Hydrauliksteuerung zwischen der Pumpe 10 und dem Hubzylinder Z verbunden. Via lines 16, the control unit CU is also connected to electrical components of the hydraulic control between the pump 10 and the lifting cylinder Z.
  • Die Versorgungsleitung 12 vom Ausgang der Pumpe 10 führt zu einem Knoten 17 in der Arbeitsleitung 7. Stromauf des Knotens 17 und stromauf einer Abzweigung 35 ist ein 2/2-Heben-Druckregelventil 18 in Sitzventilbauweise angeordnet, das durch einen Proportionalmagneten 20 betätigbar ist, eine lastdruckunabhängige Druckvorsteuerung 21 aufweist, und durch eine Feder 19 bei stromlosem Proportionalmagneten 20 in der gezeigten Absperrstellung gehalten wird, in der die Versorgungsleitung 12 in Richtung zum Knoten 17 leckagefrei abgesperrt ist. The supply line 12 from the output of the pump 10 leads to a node 17 in the working line 7 upstream of the node 17 and upstream of a junction 35 is a 2/2-lifting pressure control valve 18 is arranged in a seat valve design, which can be actuated by a proportional solenoid 20, a has independent of load pressure pilot pressure control 21, and is held by a spring 19 when energized proportional magnet 20 in the illustrated shut-off position in which the supply line is blocked leak-free in the direction of the node 17 12th Bei Bestromung des Proportionalmagneten 20 sind der Bestromung entsprechende Druckregel-Durchgangsstellungen einstellbar, wobei bei maximaler Bestromung eine zumindest im Wesentlichen ungedrosselte Durchgangsstellung 28 gegeben ist. When current supply to the proportional solenoid 20 of the current supply corresponding pressure-through positions are adjustable, wherein at maximum energization an at least substantially unrestricted passage position is given 28th Von der Abzweigung 35 kann eine gestrichelt angedeutete Vorsteuerleitung 22 zur Druckvorsteuerung 21 abzweigen, um den in Durchgangsstellungen des 2/2-Heben-Druckregelventils 18 stromauf eines in Richtung zur Pumpe 10 sperrenden Rückschlagventils 23 an der Hebenseite 8 wirkenden Lastdruck zu melden. From the junction 35, a indicated by dashed lines pilot line 22 to pilot pressure control 21 branch off to upstream of a blocking towards the pump 10 check valve to report the in the passage positions of the 2/2-lifting pressure control valve 18, 23 acting on the lifting side 8 load pressure. Die Lastdruckmeldung kann auch ohne eigene Vorsteuerleitung 22 im Inneren des 2/2-Heben-Druckregelventils 18 erfolgen, und dient zB dazu, über eine vom Proportionalmagneten 20 verstellbare Verstelldrossel gegen die Betätigungskraft des Proportionalmagneten eine dem Lastdruck proportionale Stellkraft zu erzeugen, die der Proportionalmagnet 20 als Regelgröße verarbeitet, um lastdruckunabhängig regeln zu können. The load pressure signal can be made 18 without its own pilot line 22 in the interior of the 2/2-lifting pressure control valve, and is used for example to generate a voltage proportional to the load pressure force on an adjustable from the proportional solenoid 20 variable throttle against the actuating force of the proportional magnets of the proportional solenoid 20 processed as a control variable to regulate the load pressure independent. Ferner zweigt von der Abzweigung 35 der Lastdrucksignalkreis-Abschnitt 36 zur Versorgungsregelung 11 ab. Furthermore, branches off from the branch 35 of the load pressure signal circuit section 36 to the controller 11 from supply. Der Abschnitt 36 kann beispielsweise über ein nicht gezeigtes Wechselventil in den nicht gezeigten Lastdrucksignalkreis eingegliedert sein und führt ein Lastdrucksignal sobald der Proportionalmagnet 20 des 2/2-Heben-Druckregelventils 18 bestromt ist. The portion 36 may for example be incorporated into a not shown change-over valve in the load pressure signal circuit, not shown, and executes a load pressure signal when the proportional solenoid 20 of the 2/2-lifting pressure control valve is energized 18th
  • In einer vom Knoten 17 zum Rücklauf 13 verlaufenden Leitung 24 ist ein Systemdruckbegrenzungsventil 25 (Sekundärdruckbegrenzung) enthalten, dessen Ansprechdruck einstellbar ist. In one extending from the node 17 to the return line 24 13, a system pressure relief valve 25 is contained (the secondary pressure limiting) whose opening pressure is adjustable.
  • In einer weiteren, vom Knoten 17 zum Rücklauf 13 verlaufenden Leitung 26 ist ein 2/2-Senken-Druckregelventil 27 in Sitzventilbauweise enthalten, das einen Proportionalmagneten 30 zur Betätigung einer lastdruckunabhängigen Druckvorsteuerung 31 aufweist. In a further, from the node 17 to the return line 13 extending line 26 is a 2/2-sink pressure regulating valve is included in poppet valve construction 27, which has a proportional solenoid 30 for actuating a load pressure-independent pressure feedforward 31st In dem 2/2-Senken-Druckregelventil 27 kann in der von einer Feder 29 bei stromlosem Proportionalmagneten 30 eingestellten Absperrstellung zwar leckagefreie Dichtheit zumindest in Strömungsrichtung zum Rücklauf 13 herrschen, dies jedoch hier zB gepaart mit einer Nachsaug-Rückschlagfunktion in Strömungsrichtung vom Rücklauf 13 zum Knoten 17. Ferner kann das 2/2-Senken-Druckregelventil 27 im Unterschied zum 2/2-Heben-Druckregelventil 18 abhängig von der Bestromung des Proportionalmagneten 30 variabel gedrosselte Durchgangsstellungen 31 einnehmen. In the 2/2-sink pressure control valve 27 leak-tightness of this, however, for example, in the set by a spring 29 when energized proportional magnet 30 shut-off position while at least prevail in the flow direction to the return line 13, here coupled with a After suction-check valve function in the direction of flow from the return 13 to the node 17. Further, / 2 occupy the 2-sink pressure regulating valve 27 in contrast to the 2/2-lifting pressure control valve 18 depending on the current supply to the proportional solenoid 30 variably throttled through positions 31st Eine gestrichelt angedeutete Vorsteuerleitung 32 kann vorgesehen sein, um den Lastdruck an der Hebenseite 8 an die Druckvorsteuerung 31 zu melden, damit, wie erwähnt, auch hier mit dem Proportionalmagneten 30 durch eine vom Lastdruck abhängige Stellkraft strikt lastdruckunabhängig geregelt wird. A indicated by dashed lines pilot line 32 can be provided to report the load pressure on the lifting side 8 to the pilot pressure control 31 so that, as mentioned, controlled also by the proportional magnet 30 by a dependent on the load pressure force strictly load pressure-independent. Der Lastdruck kann alternativ innen im Ventil 27 zum Erzeugen der Steuerkraft abgegriffen werden (Entfall der Vorsteuerleistung 32). The load pressure may alternatively be tapped inside the valve 27 for generating the control force (elimination of the pilot power 32).
  • In dem Lastdrucksignalkreis-Abschnitt 36 ist schließlich ein 2/2-Schwarz/Weiß-Magnetventil 37 mit einem gegen eine Schließfeder 39 wirkenden Schwarz/Weiß-Schaltmagneten 38 enthalten, das zB so verschaltet ist, dass es bei stromlosem Schwarz/Weiß-Magneten 38 die von der Schließfeder 39 eingestellte Durchgangsstellung hält, hingegen bei Bestromen des Schwarz/Weiß-Schaltmagneten 38 absperrt. In the load pressure signal circuit section 36 is a 2/2-black / white solenoid valve 37, finally, is included with an acting counter to a closing spring 39 black / white switching magnet 38, for example, is connected so that it at electroless black / white magnet 38 the set of the closing spring 39 through position holds, however, in supplying current to the black / white switching magnet 38 shuts off.
  • Die in In the Fig. 2 Fig. 2 gezeigte Ausführungsform des elektronisch-hydraulischen Hubwerksregelsystems E unterscheidet sich von der der Embodiment shown the electronic-hydraulic Hubwerksregelsystems E is different from that of the Fig. 1 Fig. 1 dadurch, dass ein Regenerativbetrieb mit Energierückgewinnung möglich ist, da eine das 2/2-Heben-Druckregelventil 18 umgehende Leitung 40 von der Versorgungsleitung 12 zum Knoten 17 führt, an welche ein Druckspeicher 41 (zB mit Gasdruckvorspannung oder Federvorspannung) angeschlossen ist. characterized in that a regenerative operation with energy recovery is possible, since the 2/2-lifting pressure control valve 18 bypassing line 40 leads from the supply line 12 to node 17 to which a pressure accumulator 41 (for example with Gasdruckvorspannung or spring bias) is connected. Ferner ist hier ausgangs der Pumpe 10 ein zur Pumpe sperrendes Rückschlagventil 42 angeordnet, und stromauf des Knotens 17 ein in Richtung zum Knoten 17 sperrendes Rückschlagventil 43. Über das Rückschlagventil 43 kann, beispielsweise bei abgeschalteter Pumpe 10, der Lastdruck an der Hebenseite 8 des Hubzylinders Z zum Laden des Druckspeichers 41 genutzt werden, oder können Lastdrucksteigerungen beispielsweise resultierend aus Fahrbewegungen oder beim Beenden einer Absenkbewegung einer Last hierfür genutzt werden. Further, a blocking to the pump check valve 42 is disposed here the output of the pump 10 and upstream of the node 17, a blocking in the direction of the node 17 check valve 43. Via the check valve 43, for example when the pump 10, the load pressure on the lifting side 8 of the lifting cylinder Z are used to charge the accumulator 41, or can load pressure increases resulting for example be used for this purpose from movements or stoppage of a lowering of a load. Die rückgewonnene hydraulische Druckenergie kann zur Entlastung der Pumpe 10 genutzt werden, indem bei Bestromen des Proportionalmagneten 20 des 2/2-Heben-Druckregelventils 18 zunächst die gespeicherte Energie aus dem Druckspeicher 41 ohne Hilfe der Pumpe 10 benutzt wird. The recovered hydraulic pressure energy can be used for relief of the pump 10 by at supplying current to the proportional solenoid 20 of the 2/2-lifting pressure control valve 18 is first stored energy is used from the pressure accumulator 41 without the aid of the pump 10 degrees. Außerdem ermöglicht der auch von der Pumpe 10 zu ladende Druckspeicher 41 eine vorbestimmte hydraulische Dämpfwirkung. Moreover, the to be charged also from the pump 10 the pressure accumulator 41 allows a predetermined hydraulic damping action.
  • In beiden Ausführungsformen wird zum Ausfahren des Hubzylinders Z bei stromlosem Proportionalmagneten 30 der Proportionalmagnet 20 in einem der gewünschten Hebegeschwindigkeit entsprechenden Ausmaß bestromt, wobei das 2/2-Schwarz/Weiß-Magnetventil 37 in der gezeigten Durchgangsstellung ist und der Lastdruck an der Abzweigung 35 abgegriffen und an die Versorgungsregelung 11 übertragen wird. In both embodiments, it is to extend the lifting cylinder Z when energized proportional solenoid 30 of the proportional solenoid 20 in proportion to the desired lifting speed extent energized wherein the 2/2-black / white solenoid valve 37 is in the shown passage position and the load pressure tapped at the junction 35 and is transmitted to the supply arrangements. 11 Die Hebebewegung des Hubzylinders Z erfolgt mit der gewählten Geschwindigkeit lastdruckunabhängig. The lifting movement of the lifting cylinder Z by means of the selected speed, regardless of the load pressure. Ist das Hubwerk 1 hydraulisch zu blockieren oder anzuhalten, werden beide Proportionalmagneten 20, 30 stromlos geschaltet. Is the lifting gear 1 hydraulically to block or stop the two proportional magnets 20, 30 are switched currentless. In In Fig. 2 Fig. 2 kann der Lastdruck an der Hebenseite 8 den Druckspeicher 41 laden. the load can load pressure on the lifting side 8 the accumulator 41st Ist das Hubwerk 1 abzusenken, wird bei stromlosem Proportionalmagneten 20 und unbestromtem Schwarz/Weiß-Schaltmagneten 38 der Proportionalmagnet 30 bestromt, um die Senken-Bewegung mit einer mit dem Stromwert proportionalen Geschwindigkeit zu steuern, wobei zB eine bestimmte Dämpfung oder Geschwindigkeitsbegrenzung eingestellt werden kann und zunächst gegebenenfalls der Druckspeicher 40 geladen wird. If the lifting mechanism lowering 1, wherein energized proportional magnet 20 and the de-energized black / white switching magnet 38 of the proportional solenoid is energized 30 to control the lowering movement by a proportional with the current value of speed, can be adjusted, for example, a certain attenuation or speed limit and first, if appropriate, the pressure accumulator is charged 40th
  • Um eine Schwimmstellungsfunktion für das Hubwerk 1 einzustellen, schaltet das Steuergerät CU den Proportionalmagneten 20 stromlos, wird der Proportionalmagnet 30 gegebenenfalls maximal bestromt, und wird gleichzeitig der Schwarz/Weiß-Schaltmagnet 38 bestromt, so dass in der Absperrstellung des 2/2-Heben-Druckregelventils 18 das 2/2-Senken-Druckregelventil 27 seine drosselnde volle Durchgangsstellung (oder falls gewünscht, eine gedrosselte Zwischen-durchgangsstellung) einstellt und gleichzeitig der Lastdrucksignalkreis-Abschnitt 36 abgesperrt ist, so dass keine Lastdrucksignale zur Versorgungsregelung 11 gelangen. To set a floating position function for the lifting mechanism 1, the control unit CU switches the proportional solenoid 20 de-energized, the proportional solenoid 30 is optionally supplied with current maximum and the black / white switching solenoid 38 is energized simultaneously, so that in the shut-off of the 2/2-LIFT pressure control valve 18, the 2/2-sink pressure regulating valve 27 assumes its throttling full passage position (or, if desired, a throttled intermediate passage position) is adjusted while the load pressure signal circuit section is blocked 36 so that no load pressure signals to supply arrangements 11 pass.
  • Zu beiden Ausführungsformen in For both embodiments, in Fig. 1 und 2 Fig. 1 and 2 ist angegeben, dass die Druckregelventile 18, 27 ideal lastdruckunabhängig arbeiten, zB entsprechend it is indicated that the pressure control valves 18, 27 ideal work load pressure-independent, for example, corresponding EP 10 195 693.6 EP 10 195 693.6 oder gegebenenfalls sogar or possibly even EP 2 270 340 A EP 2270340 A . , Bei einer nicht gezeigten Alternative könnte nur das 2/2-Senken-Druckregelventil 27 lastdruckunabhängig arbeiten, weil das 2/2-Heben-Druckregelventil 18 gegebenenfalls durch die Versorgungsregelung 11 über das Lastdrucksignal so unterstützt wird, dass in der Kombination Lastdruckunabhängigkeit erzielt wird. In a not shown alternative, only the 2/2-lowering pressure control valve 27 could work load pressure independent because the 2/2-lifting pressure control valve 18 is optionally assisted by the supply arrangements 11 via the load pressure signal such that the combination load pressure independence is achieved.

Claims (9)

  1. Electronic-hydraulic hoisting gear regulation system (E) for at least one single acting hoisting gear-lifting cylinder (z), comprising an EHR-control device (CU), a load pressure signal circuit, and at least one pressure regulating valve between a pump/return-assembly (9) and a lifting side (8) of the hoisting gear-lifting cylinder (z), the pressure regulating valve being actuatable by the control device (CU) via a proportional solenoid (20, 30), wherein the pump (10) is controlled by the load pressure signal circuit (4) for supplying a working line (7) extending to the lifting side (8), and wherein in addition to multiple EHR-regulating functions by the EHR-control device (CU) a floating position function of the lifting cylinder (z) can be adjusted, characterized in that a 2/2-lifting pressure regulating valve (18) designed as a seat valve and having proportional solenoids (20) and a load pressure independent pilot control (21) is arranged between the pump (10) and a knot (17) of the working line (7), that a 2/2-lowering-pressure regulating valve (27) designed as a seat valve and having proportional solenoids (30) and a load pressure independent pilot control (30) is arranged between the knot (7) and the return (13), and that in a section (36) of the load pressure signal circuit connected to a supplying regulating assembly (11) of the pump (10) and branching off between the 2/2-lifting pressure regulating valve (18) and the knot (17) a 2/2-black/white-solenoid valve (37) is provided, which is in a through-flow position when EHR-regulating functions are set and which is in a blocking position when the floating position function is adjusted and a proportional solenoid (30) of the 2/2-lowering-pressure regulating valve (27) is supplied with electric current.
  2. Electronic-hydraulic hoisting gear regulation system according to claim 1, characterized in that the 2/2-black/white-solenoid valve (37) is a seat valve having a closing spring (39) for adjusting the through-flow position when the black/white-solenoid (38) is current-free, and that the seat valve can be switched into the blocking position with electric current supplied to the black/white-solenoid (38) and when the floating position function is selected by the control device (CU).
  3. Electronic-hydraulic hoisting gear regulation system according to claim 1, characterized in that the 2/2-lifting-pressure regulating valve (18) can be switched to a through-flow position (28) substantially without then executing a throttling effect and with maximum electric current supplied to the proportional solenoid (20), and that the 2/2-lowering-pressure regulating valve (27) can be switched with increasing electric current supplied to the proportional solenoid (30) into through-flow position (34) only with a throttling effect, preferably, into proportionally variable throttling through-flow positions.
  4. Electronic-hydraulic hoisting gear regulation system according to claim 1, characterized in that the pump (10) is either a variable capacity pump or a constant displacement pump, respectively having a supply regulation (11) for supplying the working line (7), the supply regulation (11) being connected at least with the load pressure signal circuit-section (36) containing the 2/2-black/white solenoid valve (37).
  5. Electronic-hydraulic hoisting gear regulation system according to claim 1, characterized in that a check valve (23) is arranged between the branching-off (35) of the load pressure signal circuit-section (36) and the knot (17), the check valve (23) blocking in a direction toward the pump (10).
  6. Electronic-hydraulic hoisting gear regulation system according to claim 1, characterized in that a pressure accumulator (41) having a spring pre-load or gas pressure pre-load connected with a deviating line (40) deviating from the 2/2-lifting-pressure regulating valve (18) between the pump (10) and the knot (17).
  7. Electronic-hydraulic hoisting gear regulation system according to claim 6, characterized in that upstream of the deviating line (40), a check valve (42) blocking in a direction towards the pump (10) and in the deviating line (40) upstream of the knot (17), a check valve (43) blocking in a direction towards the knot (17) are provided.
  8. Electronic-hydraulic hoisting gear regulation system according to claim 1, characterized in that the 2/2-lowering-pressure regulating valve (27), at least when the proportional solenoid (30) is current-free, functions as a suction-check valve (33) opening in a direction to the lifting side (8).
  9. Electronic-hydraulic hoisting gear regulation system according to at least one of the preceding claims, characterized in that within or at the respective pilot control (21, 31) by the respective load pressure at the lifting side (8) and when the proportional solenoid (20, 30) is supplied with electric current, an actuating force can be generated hydraulically and counter to the actuating force of the proportional solenoid (20, 30), which actuating force is proportional to the load pressure, preferably by an adjustable aperture incorporated into the pressure pilot control (21, 31) and actuated by the proportional solenoid (20, 30).
EP11190345.6A 2011-11-23 2011-11-23 Electronic-hydraulic hoisting gear regulation system Active EP2597209B1 (en)

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Publication number Priority date Publication date Assignee Title
US6397655B1 (en) * 2000-04-03 2002-06-04 Husco International, Inc. Auto-calibration of a solenoid operated valve
ITBO20020612A1 (en) * 2002-09-27 2004-03-28 Cnh Italia Spa Coupling device farm implements to a tractor.
DE20317749U1 (en) * 2003-11-18 2005-03-24 Hawe Hydraulik Gmbh & Co Kg Electrohydraulic regenerative control device
DE102005005314A1 (en) 2004-12-20 2006-06-22 Bosch Rexroth Aktiengesellschaft Valve assembly and method for driving a double-acting consumer
US7921880B2 (en) * 2007-08-20 2011-04-12 Hydraforce, Inc. Three-way poppet valve with intermediate pilot port
DE102007040877A1 (en) 2007-08-29 2009-03-05 Robert Bosch Gmbh Hoist and method for driving a hoist
EP2270340B1 (en) 2009-07-02 2013-01-09 HAWE Hydraulik SE Pilot-operated hydraulic seat valve

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