EP2820301A1 - Procédé d'utilisation d'un ensemble à pompe hydraulique et ensemble à pompe hydraulique - Google Patents

Procédé d'utilisation d'un ensemble à pompe hydraulique et ensemble à pompe hydraulique

Info

Publication number
EP2820301A1
EP2820301A1 EP12708798.9A EP12708798A EP2820301A1 EP 2820301 A1 EP2820301 A1 EP 2820301A1 EP 12708798 A EP12708798 A EP 12708798A EP 2820301 A1 EP2820301 A1 EP 2820301A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic pump
load state
load
control variable
threshold value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12708798.9A
Other languages
German (de)
English (en)
Inventor
Dietmar Lindner
Carsten Sauerbier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lukas Hydraulik GmbH
Original Assignee
Lukas Hydraulik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lukas Hydraulik GmbH filed Critical Lukas Hydraulik GmbH
Publication of EP2820301A1 publication Critical patent/EP2820301A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F04B49/002—Hydraulic systems to change the pump delivery
    • 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
    • F04B49/06—Control using electricity
    • 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
    • F04B49/22—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 by means of valves

Definitions

  • the present invention relates to a method for operating a hydraulic pump arrangement according to the preamble of claim 1 and to a hydraulic pump arrangement according to the preamble of claim 9.
  • Hydraulic pump assemblies of the type previously described are used for a variety of applications. They are usually portable and therefore equipped with a self-sufficient power source such as a battery or the like. On the one hand, they serve as part of hydraulically driven rescue tools such as so-called spreaders or cutting tools, which are used by emergency personnel to rescue people trapped or spilled in vehicle wrecks. On the other hand, you will also find application in the tool technology z. B. for crushing scrap parts, etc.
  • the switching valves for operating the hydraulically driven tools are located directly on the tool, so that the operator can control the tool via the switching valve as needed directly. The necessary for the drive hydraulic pump assemblies are therefore usually associated with the individual tools via flexible hydraulic hoses in connection.
  • hydraulic hoses may have different lengths and thus create different pressure conditions.
  • rescue tools for different situations of use, which may need to be changed on site if the situation requires it.
  • Different rescue tools in turn establish different energy levels z. For example, different idle pressures.
  • Such an energy-saving mode takes place, for example, by switching over from a load state to a non-load state (switching of the operating state), as long as the tool no longer has to carry out any work.
  • PRIOR ART US Pat. No. 5,678,982 discloses a portable hydraulic system according to the preamble of claim 1.
  • This hydraulic system already has a control of the operation in a load state or non-load state with the aid of a switch, which switches depending on a pressure threshold between the load state and non-load state.
  • This pressure threshold is set by an absolute pressure and by a pressure sensor, which picks up the pressure at the pump outlet and activates a changeover switch.
  • the changeover switch is actuated and the system is switched from a non-load state to a load state or vice versa.
  • This known hydraulic system worked well as long as long as its constituent parts, namely the hydraulic pump arrangement, the hose line and the tool, are matched to one another. When replacing tools with different idle pressures and / or when using different hose lengths but it comes to malfunction.
  • the object of the present invention is to provide a new method for operating a hydraulic pump arrangement as well as a new hydraulic pump arrangement. On the one hand to provide a saving of energy on the other hand ensures trouble-free operation even under different system pressure conditions.
  • control variable S At least one input variable is set for the control, which is dependent on the work to be done by the motor of the hydraulic pump assembly malfunctions due to changing pressure conditions with variation of the hose length, when changing tools, with temperature fluctuations, etc. effectively excluded, because the relevant control variable is directly dependent on the work to be performed by the engine.
  • First and second thresholds Wl and W2 are different. In particular, the first threshold value Wl is lower than the second threshold value W2.
  • the control makes it possible even when stopping the movement of the tool under load, for example, when the emergency physician in a vehicle trapped person still needs a little more space for care and the rescue tool (for example, a spreader) must therefore be implemented again, Change from the load state to the non-load state and make a subsequent switch from the non-load state to the load state in a further movement of the tool under load.
  • the rescue tool for example, a spreader
  • the first control variable Sl (motor current) is assigned a first threshold value Wl, wherein a switch from the non-load state in the load state takes place and the control variable S2 is assigned a second threshold value W2, at which a changeover from the load state to the no-load state takes place.
  • Wl first threshold value
  • W2 second threshold value
  • the second threshold is preferably a variable value that continuously updates during operation of the hydraulic pump assembly, i. is overwritten in a memory, the operation of the hydraulic pump assembly adapts to multiple operating situations.
  • control variable S is preferably also associated with a third threshold value W3, with a changeover from the load state to the non-load state as a function of both the second threshold value W2 and the third threshold value W3. This avoids switching too quickly from the load state to the no-load state.
  • the third threshold value W3 is preferably a fixed value of the control variable S.
  • the motor current is used, ie the power consumption of the motor of the hydraulic pump, which is a measure of the from Engine represents the hydraulic pump assembly to be performed work.
  • the determination of the motor current can be done in different ways.
  • the pressure or the engine torque can also be used as control variable S.
  • these are preferably time-related values, ie values that represent the change in the control variable S over a predetermined time interval.
  • the hydraulic pump device detects the motor current by measuring a voltage drop across a resistor, whereupon the value of the motor current can be concluded.
  • a current measuring device such as an ammeter or the like may be provided for measuring the current in the motor line.
  • the memory is expediently a rewritable memory of the type RAM or EEPROM.
  • the speed of the motor is reduced by changing the motor voltage in its speed.
  • a voltage is applied to the motor as a voltage pulse, preferably with a constant pulse height, ie intensity, but different pulse width.
  • the voltage is thus modulated.
  • the current adjusts due to the external load.
  • Fig. 1 is a schematic representation of a first embodiment of the present invention
  • Fig. 2 is a flowchart of the control of the hydraulic pump assembly according to the embodiment of Fig. 1;
  • Fig. 3 is a diagrammatic representation of the course of the motor current of the hydraulic pump assembly of FIG. 1;
  • FIG. 4 shows a further diagrammatic representation of the course of the motor current of the hydraulic pump arrangement according to FIG. 1 with a break in work;
  • Fig. 6 is a schematic representation of the use of the hydraulic pump assembly according to the invention at different hose lengths and Fig. 7 is a schematic representation of the use of the hydraulic pump assembly according to the invention in various types of hydraulic tools.
  • the reference numeral 1 denotes the hydraulic pump arrangement according to the invention in its entirety. It is portable and is preferably flexible Hose lines 15 with a replaceable hydraulic tool 18 in conjunction. For a quick coupling or decoupling of the hydraulic pump assembly clutches 14 ,.16 may be provided at the output of the hydraulic pump assembly 1 and at the input of the hydraulic tool 18.
  • the hydraulic pump arrangement 1 comprises a pump 2 and an electric motor 4 which drives the pump 2.
  • the electric motor 4 is supplied with electrical energy by a battery 19 or a power supply unit.
  • the pump 2 has a tank 3 for the hydraulic fluid. From the pump 2, a pressure line and from the tank 3, the tank line from the hydraulic pump assembly 1 leads to the respective clutch 14th
  • the reference numeral 10 a control device for sequential control of the hydraulic pump assembly 1 is characterized.
  • it comprises a microcontroller 6, a memory 7, a pulse width modulation generator 8 and an analog / digital converter 9.
  • the abovementioned components are accommodated on a printed circuit board.
  • the microcontroller 6 is preferably connected to a main switch 5 in connection. With the latter, the circuit from the battery 19 to the microcontroller 6 is closed or interrupted.
  • the electric motor 4 may be connected directly to the main switch 5, so that the former is supplied with electrical energy from the battery 19 when turning on the main switch 5.
  • the motor current that is, the current consumed by the electric motor 4 during the operation of the hydraulic pump assembly is measured as the control variable S for the load switching (switching of the operating state).
  • the resistor 13 is connected to a signal line 23 to the analog / digital converter 9 in combination.
  • the latter converts the analog signals into digital signals for further signal evaluation.
  • the current detection is preferably carried out indirectly via the voltage drop across the resistor 13. This voltage drop is amplified by the subsequent amplifier 21 and goes through the signal line 23 as an input to the analog-to-digital converter 9.
  • the digital data is processed by the microcontroller 6 and the data in Memory 7 (thresholds from the control logic) matched. From this, the corresponding pulse width is output in the generator 8 for pulse-width modulation and the power transistor 11 (eg, a MOSFET transistor) is switched accordingly.
  • the power transistor 11 eg, a MOSFET transistor
  • the power transistor 11 is turned off, the current flows through the freewheeling diode 12 connected in parallel with the motor 4. As it were, the negative pole of the motor 4 is clocked. However, it is also possible that the positive pole is clocked.
  • the above-described embodiment of the present invention has two operating states namely a load operation and a non-load operation.
  • load operation the full electric power (e.g., 24V) is supplied to the electric motor 4, and a reduced electric power (e.g., 2V) under no-load operation.
  • Switching takes place by the control unit 10 by means of the pulse width modulation generator 8, which cooperates with the power transistor 11 as described.
  • the pulse width modulation generator 8 together with the power transistor 11 preferably form continuous, periodic current signals which differ only in their pulse width as a function of the respective load state.
  • the pulse width is greater in terms of a unit of time, the pulse width is smaller in the no-load condition.
  • the respective hydraulic tool 18 comprises a hydraulic cylinder 20, which is connected via a switching valve 17 with the hose lines 15.
  • the switching valve 17 is preferably a so-called 4/3 way switching valve, with which it is possible, the two directions of movement (forward and backward) of the hydraulic cylinder 20 and an idle position (center position the switching valve 17) set.
  • the switching valve 17 is provided for example in the form of a so-called star grip directly on the tool 18.
  • the hydraulic pump arrangement 1 according to the invention is put into operation by switching on the main switch 5, the electric motor 4 is supplied with electrical energy (in this case, for example, 2V) in the non-load range.
  • electrical energy in this case, for example, 2V
  • the current which is consumed by the electric motor 4 is permanently determined in the manner described in the introduction.
  • a differential current is determined, ie a current difference over a fixed period of time.
  • a first threshold value Wl is deposited.
  • the determined value of the current consumption of the electric motor 4 is compared with the first threshold value Wl.
  • the hydraulic pump arrangement remains in the non-load range. If the determined value of the power consumption becomes greater than the first threshold value Wl, the hydraulic pump arrangement switches into the load range. In the load range of the electric motor 4 with a voltage of z. B. 24 V operated. Immediately after the upshift into the load range, the current is determined and stored as a threshold value W2 in memory 7. This overwrites the last value in memory. An individual value, dependent on the actual conditions (temperature, connected hose length, type of rescue device), is thus always stored in the memory 7 after switching to the load range.
  • a third threshold W3 is preset in the controller, which represents a fixed value. If the permanently measured, consumed current of the electric motor 4 remains greater than the second threshold value W2 or third threshold value W3, the control remains in load operation. Unless the permanent measured consumed current of the electric motor 4 becomes smaller than the second threshold W2 as well as becomes smaller than the third threshold W3, the controller switches to the non-load operation (2 V).
  • the control of the motor drive is plotted against the time axis t plotted against a current curve I.
  • the electric motor is first supplied with a voltage of 2 volts. After a certain period of time, the control valve 17 is actuated by the operator, whereupon the hydraulic cylinder 20 of the tool 18 moves forward without any external load.
  • the measured current I exceeds the first threshold value Wl, so that the controller 10 switches the operation from 2 V to 24 V.
  • the electric motor 4 only needs a substantially constant current (after a certain transient response).
  • the current required by the electric motor 4 increases sharply until a relaxation due to the completed deformation or the cutting of an object or component or the like occurs.
  • the control valve 17 has been brought into the neutral position (idle)
  • the current required by the electric motor 4 drops sharply again.
  • the controller switches to the non-load operation (2 V).
  • FIG. 4 differs from that according to FIG. 3 in that a work break is set during operation.
  • the break as in Fig.4 can z. B. occur when the operator is unsure, briefly lets go of the star grip, and then continue. -Hereby the control valve 17 is brought by the operator in the neutral position (idle position). The power required by the electric motor 4 drops rapidly. If the power consumption has fallen below both the third threshold value W3 and the second threshold value W2, the controller switches from load mode to the non-ast status. Once the work cycle is resumed, the operator actuates the control valve 17 again, so that the electric motor 4 again draws power.
  • the non-load state is switched back to the load mode, whereby a new threshold value W2 is determined and stored in the memory 7. Since the break in work took place near the vertex of the current curve, a very high threshold value W2 is stored. To avoid immediate switching, the third threshold W3 is provided. Only when the determined motor current has also fallen below the third threshold value W3 does the control switch from the load mode to the non-load state.
  • this embodiment of the invention has instead of an electrical resistance a current measuring device 22, for example in the form of an ammeter.
  • This current measuring device measures the current in the motor cable.
  • the current measuring device 22 is also connected via a signal line 23 to the analog / digital converter 9 in connection.
  • two further connections T and P are provided.
  • the control of the load and the pressure and / or temperature can be used as an additional control variable z.
  • B is the pressure as a leading variable and the current as an auxiliary to ensure more accurate switching through higher signal resolution.
  • the recording of the temperature allows the use of an additional decision criterion to evaluate the main size. In Fig. 5, this is the inputs T (temperature) and P (pressure) on the analog / digital converter 9 marked.
  • the hydraulic pump arrangement 1 can, depending on the purpose of use, be provided via the clutches 14 or 16 as well as variable hose lengths 15a or 15b may be connected to the same tool 18.
  • variable hose lengths 15a or 15b may be connected to the same tool 18.
  • the existing pressure conditions in the system change.
  • this change in the pressure conditions does not lead to malfunctions, as according to the invention the control of the operation of the hydraulic pump arrangement 1 via the motor current is provided as control variable S and this variable is directly dependent on the work to be performed by the motor of the hydraulic pump arrangement 1.
  • the motor current is compared with at least partially variable current thresholds (adaptive control).
  • a tool 18a in the form of a cutter has a different idling power consumption than a spreader (tool 1b). These differences are thus included in the control of the hydraulic pump assembly 1 with a. The same applies to a change in the length of the hose lines while changing the type of tool la to lc.
  • control variable S ie control variable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

La présente invention concerne un procédé d'utilisation d'un ensemble à pompe hydraulique appartenant à un outil hydraulique, en particulier portatif, travaillant en autarcie énergétique ou avec alimentation par le réseau, l'ensemble à pompe hydraulique étant relié à l'outil hydraulique de façon démontable par une liaison par tuyauterie et étant entraîné par une source d'énergie électrique, et l'ensemble à pompe hydraulique étant commandé en fonction de la charge en ce sens qu'il est inversé d'un état de charge sur un état hors charge et inversement, une première alimentation en énergie électrique plus élevée étant appliquée pour l'état de charge et une seconde alimentation en énergie électrique plus basse étant appliquée pour l'état hors charge. Pour résoudre le problème consistant à créer un nouveau procédé d'utilisation d'un ensemble à pompe hydraulique ainsi qu'un nouveau ensemble à pompe hydraulique qui, d'une part, assure une économie d'énergie et, d'autre part, permette d'obtenir une utilisation sans problème, même en présence de conditions variables de pression du système, le procédé selon l'invention est caractérisé par le fait que, pour la commande de l'ensemble à pompe hydraulique en fonction de la charge, on fixe une variable de commande (S) qui, en tant que grandeur d'entrée, dépend du travail qui doit être produit par le moteur de l'ensemble de pompe hydraulique, qu'à la variable de commande (S), on associe une première valeur seuil (W1), à laquelle il se produit une inversion de l'état hors charge à l'état de charge, et qu'à la variable de commande (S) on associe une seconde valeur seuil (W2), à laquelle il se produit une inversion de l'état de charge à l'état hors charge.
EP12708798.9A 2012-02-29 2012-02-29 Procédé d'utilisation d'un ensemble à pompe hydraulique et ensemble à pompe hydraulique Withdrawn EP2820301A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/053473 WO2013127452A1 (fr) 2012-02-29 2012-02-29 Procédé d'utilisation d'un ensemble à pompe hydraulique et ensemble à pompe hydraulique

Publications (1)

Publication Number Publication Date
EP2820301A1 true EP2820301A1 (fr) 2015-01-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12708798.9A Withdrawn EP2820301A1 (fr) 2012-02-29 2012-02-29 Procédé d'utilisation d'un ensemble à pompe hydraulique et ensemble à pompe hydraulique

Country Status (4)

Country Link
US (1) US20150017021A1 (fr)
EP (1) EP2820301A1 (fr)
CN (1) CN104081053A (fr)
WO (1) WO2013127452A1 (fr)

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CN109923486B (zh) * 2017-08-11 2022-02-18 李荣圭 一种对驱动部的精准预知性维护方法
JP6779377B2 (ja) * 2017-08-11 2020-11-04 アイティーエス カンパニー リミテッドIts Co., Ltd. 駆動部の精密予知保全方法
EP4245467B1 (fr) 2018-06-26 2024-05-22 Lukas Hydraulik GmbH Appareil de travail portable pour l'utilisation portable
SE543709C2 (en) * 2019-04-17 2021-06-22 Pandrol Ab Mobile energy supply unit for hand-held hydraulic tools and method for operating a hand-held hydraulic tool
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DE102022133852A1 (de) 2022-12-19 2024-06-20 Zf Cv Systems Europe Bv Kompressorsteuerungsverfahren für einen Kolbenkompressormotor eines Kolbenkompressors und Kompressorsteuerung zum Ausführen des Verfahrens sowie Kompressorsystem und Fahrzeug damit

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Also Published As

Publication number Publication date
CN104081053A (zh) 2014-10-01
WO2013127452A1 (fr) 2013-09-06
US20150017021A1 (en) 2015-01-15

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