WO2001081770A1 - Device for supplying a hydraulic consumer with a pressure medium - Google Patents

Device for supplying a hydraulic consumer with a pressure medium Download PDF

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Publication number
WO2001081770A1
WO2001081770A1 PCT/DE2001/001114 DE0101114W WO0181770A1 WO 2001081770 A1 WO2001081770 A1 WO 2001081770A1 DE 0101114 W DE0101114 W DE 0101114W WO 0181770 A1 WO0181770 A1 WO 0181770A1
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WO
WIPO (PCT)
Prior art keywords
electric motor
pressure
control unit
electronic means
pressure generator
Prior art date
Application number
PCT/DE2001/001114
Other languages
German (de)
French (fr)
Inventor
Wilhelm Dworak
Hans Aichele
Wolfgang Steudel
Original Assignee
Robert Bosch Gmbh
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Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2001081770A1 publication Critical patent/WO2001081770A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0201—Current

Definitions

  • the invention is based on a device for supplying a hydraulic consumer with pressure medium according to the preamble of claim 1.
  • a device for supplying a hydraulic consumer with pressure medium according to the preamble of claim 1.
  • Such a device is in the form of a compact unit from the training documents "Hydraulics in theory and practice” from Robert Bosch GmbH, ⁇ utomatmaschinestechnik, Erbach, no 198 776 2601, edition 8/96, page 163 already known.
  • This compact unit consists, among other things, of a hydraulic pressure generator which, driven by an electric motor, conveys a pressure medium from a storage container to a pressure connection. This pressure connection is connected to a hydraulic consumer, not shown.
  • Such hydraulic compact units are used, among other things, in motor vehicles for chassis control.
  • the suction of air in particular when the compact unit is tilted, must be prevented. This is done by monitoring the fill level of the storage container by means of electromechanical devices.
  • electromechanical devices are equipped with movable floats that act on a fixed switching element. This switching element interrupts the voltage supply to the electric motor as soon as the level falls below a predetermined pressure medium level. The fill level is thus recorded directly.
  • a disadvantage of these electromechanical devices is that, due to their arrangement on the storage container, false triggering cannot be completely ruled out. This is particularly the case when the compact unit is in an inclined position.
  • the switching thresholds of such devices are also dependent on component tolerances and can change particularly in the case of temperature or pressure-related part expansions.
  • mechanical devices are subject to a certain system-related operational uncertainty, require additional assembly work and cause high costs due to the large number of their individual parts.
  • a device with the features of claim 1 has the advantage that the above-mentioned disadvantages are avoided by the use of electronic means for indirect detection of the fill level of the storage container.
  • the electronic means can advantageously be integrated into a control unit which is present anyway for the power supply of the drive unit. Additional, mechanically assembled components are therefore not necessary.
  • the fill level of the reservoir is indirect, that is Monitoring of the operating parameters of the pressure generator or the connected consumer is detected. There is therefore no influence by the operating temperature, the operating pressure, any part expansion or tolerances. In addition, electronic monitoring allows higher control dynamics and trouble-free operation.
  • FIGS. 2 and 3 show, on the basis of diagrams, the pressure curve at a consumer connected to this device and the current consumption of the electric motor, in each case when sucking in pressure medium and when sucking in air. All characteristics are plotted over time.
  • a device 10 shown in FIG. 1 for supplying a hydraulic consumer with pressure medium consists of a mounting flange 12, a pressure generator 14 anchored thereon, an electric motor 16 which is coupled to the pressure generator 14 via a coupling 17 and a reservoir 18
  • Conventionally known gear or piston pumps into consideration which suck in pressure medium from the reservoir 18 via a suction connection 22 and convey it to a pressure connection.
  • This pressure connection is usually formed on the mounting flange 12, is included Embodiment, however, on the side facing away from the viewer and therefore cannot be seen in FIG. 1.
  • the storage container 18 is preferably a hollow body made of plastic with a cubic outer contour, the outside of which faces the pressure generator 14 has an opening 24 with a molded-on neck. With this neck, the storage container 18 is pushed onto a dimensionally coordinated collar of the mounting flange 12 and anchored in a pressure-tight manner by means of a tensioning band 26. Through the lateral opening 24 of the reservoir 18, the pressure generator 14 protrudes into the interior of the reservoir 18.
  • an opening 28 Through the upper side of the storage container 18 there is an opening 28, through which a filling with pressure medium can be carried out.
  • This opening 28 is closed by a cover 30, on which connecting pieces 32 for contacting any pressure medium-carrying lines are formed.
  • the connecting pieces 32 are provided in particular for connecting return lines which return the pressure medium from a hydraulic consumer (not shown) to the reservoir 18.
  • a filter 38 for separating the back-flowing pressure medium from dirt is arranged on the inside of the cover 30 with the aid of a holder 36.
  • the device 10 is also equipped with an electronic control unit 40 to which the electric motor 16 of the pressure generator 14 is connected.
  • the task of the control unit 40 is to interrupt the voltage supply to the electric motor 16 as soon as the desired pressure level has been reached at the connected hydraulic consumer, or as soon as the suction port 22 of the pressure generator 14 emerges from the pressure medium in the reservoir 18 and there is therefore a risk of air being sucked in. Air in the system can lead to malfunctions and can cause wear on the pressure generator 14 due to insufficient lubrication.
  • While float switches are known from the prior art, in which floats quasi mechanically detect the fill level of the reservoir 18 and trigger a switching signal in operative connection with a stationary switching element, the invention is based on the idea of only indirectly filling this fill level with the aid of electronic means 42 capture.
  • These electronic means 42 evaluate, for example, the current consumption of the electric motor 16, which characteristically strives towards zero when air is drawn in and is therefore relatively easy to evaluate.
  • Sensors for measuring the current consumption can be arranged at any point on the lines 43 leading to the electric motor 16; It is particularly advantageous to integrate this sensor into the control unit 40.
  • 42 pressure sensors could be used as the means. These pressure sensors measure the instantaneous pressure at a hydraulic consumer connected to the device 10. The speed at which this pressure at the consumer changes when the pressure generator 14 is driven can be determined from the signal by differentiation over time. Naturally, when air is sucked in, the pressure at the consumer cannot rise and the speed typically drops to zero.
  • the necessary electronic means 42 for recording and evaluating these signals on the hydraulic consumer or on the electric motor 16 are inexpensive sensors available on the market. They can be connected to the electronic control unit 40 relatively easily or, for example, in the case of the current sensor, even integrated into it. In terms of circuitry, a current sensor can be represented with the already existing components for controlling the electric motor 16, so that no additional components are required.
  • FIG. 2 shows the pressure curve plotted over time on a connected hydraulic consumer.
  • the characteristic curve 44 indicates the state in which the pressure generator 14 sucks in pressure medium, while the characteristic curve 46 documents the state of the suction of air to be avoided.
  • the current consumption of the electric motor 16 is also plotted in FIG. 3 over time.
  • the electronically easily evaluable differences in the course of the characteristic curve when suctioning pressure medium (characteristic curve 48) compared to the suction of air (characteristic curve 50) can be recognized by the pressure generator 14.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a device (10) for supplying a hydraulic consumer with a pressure medium, comprising a pressure generator(14), an electric motor (16) which is used to drive the pressure generator (14), a storage tank (18) which is used to store the pressure medium, and an electronic control unit (40). The electronic control unit interrupts the voltage supply of the electric motor according to the level of the storage tank (18) in order to prevent the air from being suctioned. Air can be the cause of operational failures and wear with respect to the pressure generator (14). According to the invention, electronic means are used for indirect detection of the level of the storage tank (18).

Description

Einrichtung zur Versorgung eines hydraulischen Verbrauchers mit DruckmittelDevice for supplying a hydraulic consumer with pressure medium
Stand der TechnikState of the art
Die Erfindung geht aus von einer Einrichtung zur Versorgung eines hydraulischen Verbrauchers mit Druckmittel entsprechend der Gattung des Anspruchs 1. Eine derartige Einrichtung ist in Form eines Kompaktaggregats aus den Schulungsunterlagen "Hydraulik in Theorie und Praxis" der Robert Bosch GmbH, Geschäftsbereich Αutomatisierungstechnik, Erbach, Nr. 198 776 2601, Ausgabe 8/96, Seite 163 bereits bekannt. Dieses Kompaktaggregat besteht unter anderem aus einem hydraulischen Druckerzeuger, der angetrieben von einem Elektromotor ein Druckmittel aus einem Vorratsbehalter zu einem Druckanschluß fördert. Dieser Druckanschluß ist mit einem nicht dargestellten hydraulischen Verbraucher verbunden. Derartige hydraulische Kompaktaggregate werden unter anderem in Kraftfahrzeugen zur Fahrwerksregelung eingesetzt.The invention is based on a device for supplying a hydraulic consumer with pressure medium according to the preamble of claim 1. Such a device is in the form of a compact unit from the training documents "Hydraulics in theory and practice" from Robert Bosch GmbH, Αutomatisierungstechnik, Erbach, no 198 776 2601, edition 8/96, page 163 already known. This compact unit consists, among other things, of a hydraulic pressure generator which, driven by an electric motor, conveys a pressure medium from a storage container to a pressure connection. This pressure connection is connected to a hydraulic consumer, not shown. Such hydraulic compact units are used, among other things, in motor vehicles for chassis control.
Um einen störungsfreien und verschleißarmen Betrieb, insbesondere des Druckerzeugers sicherzustellen, muß das Ansaugen von Luft, insbesondere unter Schräglage des Kompaktaggregats, verhindert werden. Dies geschieht durch Überwachung des Füllstands des Vorratsbehalters mittels elektromechanischer Vorrichtungen. Bekannte Vorrichtungen sind dazu mit beweglichen Schwimmern ausgestattet, die ein ortsfest angeordnetes Schaltglied beaufschlagen. Dieses Schaltglied unterbricht die Spannungsversorgung des Elektromotors sobald der Füllstand unter ein vorbestimmtes Druckmittelniveau fällt. Die Erfassung des Füllstands erfolgt somit auf direktem Weg.In order to ensure trouble-free and low-wear operation, in particular of the pressure generator, the suction of air, in particular when the compact unit is tilted, must be prevented. This is done by monitoring the fill level of the storage container by means of electromechanical devices. Known devices are equipped with movable floats that act on a fixed switching element. This switching element interrupts the voltage supply to the electric motor as soon as the level falls below a predetermined pressure medium level. The fill level is thus recorded directly.
Nachteilig an diesen elektromechanischen Vorrichtungen ist, daß aufgrund ihrer Anordnung am Vorratsbehalter Fehlauslösungen nicht vollständig auszuschließen sind. Dies ist insbesondere dann der Fall, wenn sich das Kompaktaggregat in Schräglage befindet. Die Schaltschwellen derartiger Einrichtungen sind zudem von Bauteiletoleranzen abhängig und können sich insbesondere bei temperatur- oder druckbedingten Teiledehnungen verändern. Ferner unterliegen mechanische Vorrichtungen einer gewissen systembedingten Betriebsunsicherheit, bedingen zusätzliche Montagearbeitsgänge und verursachen aufgrund der Vielzahl ihrer Einzelteile hohe Kosten.A disadvantage of these electromechanical devices is that, due to their arrangement on the storage container, false triggering cannot be completely ruled out. This is particularly the case when the compact unit is in an inclined position. The switching thresholds of such devices are also dependent on component tolerances and can change particularly in the case of temperature or pressure-related part expansions. Furthermore, mechanical devices are subject to a certain system-related operational uncertainty, require additional assembly work and cause high costs due to the large number of their individual parts.
Vorteile der ErfindungAdvantages of the invention
Demgegenüber weist eine Einrichtung mit den Merkmalen des Anspruchs 1 den Vorteil auf, daß durch die Verwendung elektronischer Mittel zur indirekten Erfassung des Füllstands des Vorratsbehalters, die oben genannten Nachteile vermieden sind.In contrast, a device with the features of claim 1 has the advantage that the above-mentioned disadvantages are avoided by the use of electronic means for indirect detection of the fill level of the storage container.
Die elektronischen Mittel sind vorteilhafter Weise in eine Steuereinheit integrierbar, die zur Spannungsversorgung der Antriebseinheit sowieso vorhanden ist. Zusätzliche, mechanisch zu montierende Bauteile sind somit nicht erforderlich. Gemäß den Ansprüchen 2 und 4 wird der Füllstand des Vorratsbehalters indirekt, d.h. durch Überwachung der Betriebskenngrößen des Druckerzeugers oder des angeschlossenen Verbrauchers erfaßt. Eine Beeinflussung durch die Betriebstemperatur, den Betriebsdruck, etwaigen Teiledehnungen oder Toleranzen besteht somit nicht. Zudem erlaubt eine elektronische Überwachung eine höhere Regeldynamik und einen störungsfreieren Betrieb.The electronic means can advantageously be integrated into a control unit which is present anyway for the power supply of the drive unit. Additional, mechanically assembled components are therefore not necessary. According to claims 2 and 4, the fill level of the reservoir is indirect, that is Monitoring of the operating parameters of the pressure generator or the connected consumer is detected. There is therefore no influence by the operating temperature, the operating pressure, any part expansion or tolerances. In addition, electronic monitoring allows higher control dynamics and trouble-free operation.
Weitere Vorteile oder vorteilhafte Weiterbildungen der Erfindung sind den ünteransprüchen und der nachfolgenden Beschreibung zu entnehmen.Further advantages or advantageous developments of the invention can be found in the subordinate claims and the description below.
Zeichnungdrawing
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der Beschreibung näher erläutert. Eine erfindungsgemäße Einrichtung ist im Längsschnitt in Figur 1 dargestellt; die Figuren 2 und 3 zeigen anhand von Diagrammen den Druckverlauf an einem an diese Einrichtung angeschlossenen Verbraucher und die Stromaufnahme des Elektromotors, jeweils beim Ansaugen von Druckmittel und beim Ansaugen von Luft. Alle Kennlinien sind über die Zeit aufgetragen.Embodiments of the invention are shown in the drawing and explained in more detail in the description. A device according to the invention is shown in longitudinal section in Figure 1; FIGS. 2 and 3 show, on the basis of diagrams, the pressure curve at a consumer connected to this device and the current consumption of the electric motor, in each case when sucking in pressure medium and when sucking in air. All characteristics are plotted over time.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Eine in Figur 1 dargestellte Einrichtung 10 zur Versorgung eines hydraulischen Verbrauchers mit Druckmittel besteht aus einem Anbauflansch 12, einem daran verankerten Druckerzeuger 14, einem Elektromotor 16, der über eine Kupplung 17 mit dem Druckerzeuger 14 gekoppelt ist und einem Vorratsbehalter 18. Als Druckerzeuger 14 kommen herkömmlich bekannte Zahnradoder Kolbenpumpen in Betracht, die über einen Saugstutzen 22 Druckmittel aus dem Vorratsbehalter 18 ansaugen und zu einem Druckanschluß fördern. Dieser Druckanschluß ist üblicherweise am Anbauflansch 12 ausgebildet, liegt beim Ausführungsbeispiel aber auf der vom Betrachter abgewandten Seite und ist deshalb in Figur 1 nicht zu erkennen.A device 10 shown in FIG. 1 for supplying a hydraulic consumer with pressure medium consists of a mounting flange 12, a pressure generator 14 anchored thereon, an electric motor 16 which is coupled to the pressure generator 14 via a coupling 17 and a reservoir 18 Conventionally known gear or piston pumps into consideration, which suck in pressure medium from the reservoir 18 via a suction connection 22 and convey it to a pressure connection. This pressure connection is usually formed on the mounting flange 12, is included Embodiment, however, on the side facing away from the viewer and therefore cannot be seen in FIG. 1.
Beim Vorratsbehalter 18 handelt es sich vorzugsweise um einen aus Kunststoff hergestellten Hohlkörper kubischer Außenkontur, dessen dem Druckerzeuger 14 zugewandte Außenseite einen Durchbruch 24 mit angeformtem Hals aufweist. Mit diesem Hals ist der Vorratsbehalter 18 auf einen maßlich abgestimmten Bund des Anbauflanschs 12 aufgeschoben und mittels eines Spannbandes 26 druckmitteldicht verankert. Durch den seitlichen Durchbruch 24 des Vorratsbehalters 18 hindurch, ragt der Druckerzeuger 14 in das Innere des Vorratsbeh lters 18 hinein.The storage container 18 is preferably a hollow body made of plastic with a cubic outer contour, the outside of which faces the pressure generator 14 has an opening 24 with a molded-on neck. With this neck, the storage container 18 is pushed onto a dimensionally coordinated collar of the mounting flange 12 and anchored in a pressure-tight manner by means of a tensioning band 26. Through the lateral opening 24 of the reservoir 18, the pressure generator 14 protrudes into the interior of the reservoir 18.
Auf der Oberseite des Vorratsbehalters 18 ist eine Öffnung 28 vorhanden, über die eine Befüllung mit Druckmittel vorgenommen werden kann. Diese Öffnung 28 ist von einem Deckel 30 verschlossen, an dem Anschlußstutzen 32 zur Kontaktierung etwaiger druckmittelführender Leitungen angeformt sind. Die Anschlußstutzen 32 sind insbesondere zum Anschluß von Rücklaufleitungen vorgesehen, die das Druckmittel von einem nicht dargestellten hydraulischen Verbraucher zum Vorratsbehalter 18 zurückleiten.On the upper side of the storage container 18 there is an opening 28, through which a filling with pressure medium can be carried out. This opening 28 is closed by a cover 30, on which connecting pieces 32 for contacting any pressure medium-carrying lines are formed. The connecting pieces 32 are provided in particular for connecting return lines which return the pressure medium from a hydraulic consumer (not shown) to the reservoir 18.
An der Innenseite des Deckels 30 ist mit Hilfe einer Halterung 36 ein Filter 38 zur Trennung des rückströmenden Druckmittels von Verschmutzungen angeordnet.A filter 38 for separating the back-flowing pressure medium from dirt is arranged on the inside of the cover 30 with the aid of a holder 36.
Die Einrichtung 10 ist darüber hinaus mit einer elektronischen Steuereinheit 40 ausgestattet, an die der Elektromotor 16 des Druckerzeugers 14 angeschlossen ist. Die Aufgabe der Steuereinheit 40 besteht darin, die Spannungsversorgung des Elektromotors 16 zu unterbrechen, sobald am angeschlossenen hydraulischen Verbraucher das gewünschte Druckniveau erreicht ist, beziehungsweise sobald der Saugstutzen 22 des Druckerzeugers 14 aus dem Druckmittel im Vorratsbehalter 18 austaucht und dadurch die Gefahr des Ansaugens von Luft besteht. Luft im System kann zu Betriebsstörungen führen und kann aufgrund mangelnder Schmierung Verschleiß am Druckerzeuger 14 hervorrufen.The device 10 is also equipped with an electronic control unit 40 to which the electric motor 16 of the pressure generator 14 is connected. The task of the control unit 40 is to interrupt the voltage supply to the electric motor 16 as soon as the desired pressure level has been reached at the connected hydraulic consumer, or as soon as the suction port 22 of the pressure generator 14 emerges from the pressure medium in the reservoir 18 and there is therefore a risk of air being sucked in. Air in the system can lead to malfunctions and can cause wear on the pressure generator 14 due to insufficient lubrication.
Während dazu aus dem Stand der Technik Schwimmerschalter bekannt sind, bei denen Schwimmer den Füllstand des Vorratsbehalters 18 quasi mechanisch erfassen und in Wirkverbindung mit einem stationären Schaltglied ein Schaltsignal auslösen, liegt der Erfindung die Idee zugrunde, diesen Füllstand lediglich indirekt mit Hilfe von elektronischen Mitteln 42 zu erfassen. Diese elektronischen Mittel 42 werten beispielsweise die Stromaufnahme des Elektromotors 16 aus, die charakteristischerweise im Falle des Ansaugens von Luft gegen Null strebt und deshalb verhältnismäßig leicht auswertbar ist. Sensoren zur Messung der Stromaufnahme sind an beliebiger Stelle der zum Elektromotor 16 führenden Leitungen 43 anordenbar; besonders vorteilhaft ist es, diesen Sensor in die Steuereinheit 40 zu integrieren.While float switches are known from the prior art, in which floats quasi mechanically detect the fill level of the reservoir 18 and trigger a switching signal in operative connection with a stationary switching element, the invention is based on the idea of only indirectly filling this fill level with the aid of electronic means 42 capture. These electronic means 42 evaluate, for example, the current consumption of the electric motor 16, which characteristically strives towards zero when air is drawn in and is therefore relatively easy to evaluate. Sensors for measuring the current consumption can be arranged at any point on the lines 43 leading to the electric motor 16; It is particularly advantageous to integrate this sensor into the control unit 40.
Alternativ dazu wären als Mittel 42 Drucksensoren einsetzbar. Diese Drucksensoren messen den momentanen Druck an einem an die Einrichtung 10 angeschlossenen hydraulischen Verbraucher. Aus dem Signal läßt sich durch Differenzierung über die Zeit die Geschwindigkeit ermitteln, mit der sich bei angetriebenem Druckerzeuger 14 dieser Druck am Verbraucher ändert. Beim Ansaugen von Luft kann der Druck am Verbraucher naturgemäß nicht ansteigen und die Geschwindigkeit geht kennzeichnenderweise gegen Null.Alternatively, 42 pressure sensors could be used as the means. These pressure sensors measure the instantaneous pressure at a hydraulic consumer connected to the device 10. The speed at which this pressure at the consumer changes when the pressure generator 14 is driven can be determined from the signal by differentiation over time. Naturally, when air is sucked in, the pressure at the consumer cannot rise and the speed typically drops to zero.
Desweiteren möglich wären wegerfassende Mittel 42, die angeschlossenen am hydraulischen Verbraucher dessen Hubbewegungen auswerten. Durch Differenzierung könnte auch aus diesem Wegsignal ein Geschwindigkeitssignal abgeleitet werden. Letzteres strebt im Falle des Ansaugens von Luft ebenfalls gegen Null und kann ein Abschaltkriterium bilden.It would also be possible to use means 42 which evaluate the stroke movements connected to the hydraulic consumer. Differentiation could also a speed signal can be derived from this path signal. The latter also tends towards zero when air is sucked in and can form a switch-off criterion.
Die erforderlichen elektronischen Mittel 42 zur Erfassung und Auswertung dieser Signale am hydraulischen Verbraucher oder am Elektromotor 16 sind preisgünstig am Markt erhältliche Sensoren. Sie lassen sich relativ einfach an die elektronische Steuereinheit 40 anschließen oder beispielsweise, im Falle des Stromsensors, sogar in diese integrieren. Ein Stromsensor ist schaltungstechnisch mit den bereits vorhandenen Bauteilen zur Ansteuerung des Elektromotors 16 darstellbar, so daß keine zusätzlichen Bauelemente anfallen.The necessary electronic means 42 for recording and evaluating these signals on the hydraulic consumer or on the electric motor 16 are inexpensive sensors available on the market. They can be connected to the electronic control unit 40 relatively easily or, for example, in the case of the current sensor, even integrated into it. In terms of circuitry, a current sensor can be represented with the already existing components for controlling the electric motor 16, so that no additional components are required.
Figur 2 zeigt zur Verdeutlichung der Unterschiede im Kennlinienverlauf den Druckverlauf aufgetragen über die Zeit an einem angeschlossenen hydraulischen Verbraucher. Dabei gibt die Kennlinie 44 den Zustand an, in dem der Druckerzeuger 14 Druckmittel ansaugt, während die Kennlinie 46 den zu vermeidenden Zustand des Ansaugens von Luft dokumentiert.To illustrate the differences in the characteristic curve, FIG. 2 shows the pressure curve plotted over time on a connected hydraulic consumer. The characteristic curve 44 indicates the state in which the pressure generator 14 sucks in pressure medium, while the characteristic curve 46 documents the state of the suction of air to be avoided.
In Figur 3 ist, ebenfalls aufgetragen über die Zeit, die Stromaufnahme des Elektromotors 16 aufgezeichnet. Auch dabei sind die elektronisch leicht auswertbaren Unterschiede im Kennlinienverlauf beim Ansaugen von Druckmittel (Kennlinie 48) gegenüber der Ansaugung von Luft (Kennlinie 50) durch den Druckerzeuger 14 erkennbar.The current consumption of the electric motor 16 is also plotted in FIG. 3 over time. Here, too, the electronically easily evaluable differences in the course of the characteristic curve when suctioning pressure medium (characteristic curve 48) compared to the suction of air (characteristic curve 50) can be recognized by the pressure generator 14.
Selbstverständlich sind Änderungen oder Ergänzungen zu den beschriebenen Ausführungsbeispielen denkbar, ohne vom Grundgedanken der Erfindung anzuweichen. In diesem Zusammenhang erwähnenswert ist, daß die oben genannte Auswahl an verschiedenen elektronischen Mitteln 42 keinesfalls Anspruch auf Vollständigkeit erhebt, sondern lediglich besonders vorteilhafte Losungen angibt. Durchaus möglich ist es darüber hinaus auch, für eine besonders gute Regelstrategie mehrere verschiedene Kenngroßen erfassende elektronische Mittel 42 vorzusehen und deren Signale elektronisch miteinander zu einem gemeinsamen Ausgangssignal zu verknüpfen. Of course, changes or additions to the described exemplary embodiments are conceivable without departing from the basic idea of the invention. In this context it is worth mentioning that the above-mentioned selection of different electronic means 42 makes no claim to completeness, but only indicates particularly advantageous solutions. It is also quite possible, in addition, for a particularly good control strategy to provide a plurality of electronic means 42 which record different parameters and to link their signals electronically to one another to form a common output signal.

Claims

Ansprüche Expectations
1. Einrichtung (10) zur Versorgung eines hydraulischen Verbrauchers mit Druckmittel mit einem Druckerzeuger (14) , einem den Druckerzeuger (14) antreibenden Elektromotor (16), einem das Druckmittel speichernden Vorratsbehalter (18) und mit einer Steuereinheit (40) , die abhängig vom Füllstand des Vorratsbehalters (18) die Spannungsversorgung des1. A device (10) for supplying a hydraulic consumer with pressure medium with a pressure generator (14), an electric motor (16) driving the pressure generator (14), a storage container (18) storing the pressure medium and with a control unit (40), which depends from the fill level of the reservoir (18) the power supply of the
Elektromotors (16) regelt, gekennzeichnet, durch elektronische Mittel (42) zur indirekten Erfassung des Füllstands desElectric motor (16) regulates, characterized, by electronic means (42) for indirect detection of the fill level of the
Vorratsbehalters (18) .Reservoir (18).
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die elektronischen Mittel (42) die Stromaufnahme des Elektromotors (16) erfassen und in Wirkverbindung mit der Steuereinheit (40) die SpannungsVersorgung des Elektromotors (16) unterbrechen, sobald dessen Stromaufnahme gegen Null strebt.2. Device according to claim 1, characterized in that the electronic means (42) detect the current consumption of the electric motor (16) and in operative connection with the control unit (40) interrupt the voltage supply of the electric motor (16) as soon as its current consumption tends towards zero.
3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die elektronischen Mittel (42) integraler Bestandteil der Steuereinheit (40) sind. 3. Device according to claim 2, characterized in that the electronic means (42) are an integral part of the control unit (40).
4. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die elektronischen Mittel (42) an dem mit der Einheit (10) verbundenen hydraulischen Verbraucher angeordnet sind.4. Device according to claim 1, characterized in that the electronic means (42) are arranged on the hydraulic consumer connected to the unit (10).
5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die elektronischen Mittel (42) Drucksensoren sind, die in Wirkverbindung mit der Steuereinheit (40) die Spannungsversorgung des Elektromotors (16) unterbrechen, sobald die Geschwindigkeit mit der sich der Druck am Verbraucher ändert gegen Null geht.5. Device according to claim 4, characterized in that the electronic means (42) are pressure sensors which, in operative connection with the control unit (40), interrupt the voltage supply to the electric motor (16) as soon as the speed at which the pressure on the consumer changes Zero goes.
6. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die elektronischen Mittel (42) Wegsensoren sind, die in Wirkverbindung mit der Steuereinheit (40) die Spannungsversorgung des Elektromotors (16) unterbrechen, sobald die Geschwindigkeit einer Hubbewegung des Verbrauchers gegen Null geht.6. Device according to claim 4, characterized in that the electronic means (42) are displacement sensors which, in operative connection with the control unit (40), interrupt the voltage supply to the electric motor (16) as soon as the speed of a lifting movement of the consumer approaches zero.
7. Einrichtung nach einem der Ansprüche 1 bis 6, gekennzeichnet durch einen zwischen dem Druckerzeuger (14) und dem Elektromotor (16) angeordneten Anbauflansch (12) , an dem der Vorratsbehalter (18) verankert ist.7. Device according to one of claims 1 to 6, characterized by a between the pressure generator (14) and the electric motor (16) arranged mounting flange (12) on which the reservoir (18) is anchored.
8. Einrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß als Druckerzeuger (14) Zahnradmaschinen vorgesehen sind.8. Device according to one of claims 1 to 7, characterized in that gear machines are provided as pressure generators (14).
9. Einrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Druckerzeuger (14) , der Elektromotor (16) und der Vorratsbehalter (18) zu einer Baueinheit zusammengefaßt sind. 9. Device according to one of claims 1 to 8, characterized in that the pressure generator (14), the electric motor (16) and the reservoir (18) are combined to form a structural unit.
PCT/DE2001/001114 2000-04-20 2001-03-22 Device for supplying a hydraulic consumer with a pressure medium WO2001081770A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000119769 DE10019769A1 (en) 2000-04-20 2000-04-20 Device for supplying a hydraulic consumer with pressure medium
DE10019769.8 2000-04-20

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WO2001081770A1 true WO2001081770A1 (en) 2001-11-01

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US7354511B2 (en) * 2004-07-03 2008-04-08 Jungheiurich Aktiengesellschaft Hydraulic unit for industrial trucks
EP2345622A1 (en) * 2010-01-13 2011-07-20 Jungheinrich Aktiengesellschaft Hydraulic aggregate for industrial trucks

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DE10317854A1 (en) * 2003-04-16 2004-11-04 Volkswagen Ag Accumulator for a hydraulic brake control device, comprises accumulator housing which is located in a pressurizing medium housing for the interior installation of the accumulator
DE102005045403A1 (en) * 2005-09-23 2007-04-12 Robert Bosch Gmbh Pressure system e.g. for braking force boost and air-bag inflation safety functions in vehicle industry, has pressure generating device mounted within pressure reservoir

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US3953777A (en) * 1973-02-12 1976-04-27 Delta-X Corporation Control circuit for shutting off the electrical power to a liquid well pump
US4329120A (en) * 1980-04-24 1982-05-11 William Walters Pump protector apparatus
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US7354511B2 (en) * 2004-07-03 2008-04-08 Jungheiurich Aktiengesellschaft Hydraulic unit for industrial trucks
EP2345622A1 (en) * 2010-01-13 2011-07-20 Jungheinrich Aktiengesellschaft Hydraulic aggregate for industrial trucks

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