EP2562424B1 - Verfahren und Vorrichtung zur Steuerung eines Mehrpunktsystems zur Verteilung von Flussigkeit - Google Patents

Verfahren und Vorrichtung zur Steuerung eines Mehrpunktsystems zur Verteilung von Flussigkeit Download PDF

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EP2562424B1
EP2562424B1 EP12382344.5A EP12382344A EP2562424B1 EP 2562424 B1 EP2562424 B1 EP 2562424B1 EP 12382344 A EP12382344 A EP 12382344A EP 2562424 B1 EP2562424 B1 EP 2562424B1
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pressure
pump
point
consumption
demand
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EP2562424A2 (de
EP2562424A3 (de
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Gabriel Alejandro Bica Caffera
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Gidelmar SA
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Gidelmar SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine

Definitions

  • the present invention relates to a method for controlling a multipoint fluid distribution system and particularly to a method which comprises controlling the fluid supply pressure for a plurality of consumption points which may require different supply pressures.
  • the present invention comprises a piece of control equipment suitable for implementing the method of the first aspect of the present invention.
  • the invention provides an intelligent strategy which enables automatically adapting the operating conditions of a centrifugal pump and adjusting its performance to the various needs of different consumption points (variable demand), offering an adequate pressure at all times to said consumption point or points and further allowing an optimised use of water and energy resources.
  • Some prior inventions disclose systems and/or methods for pressurising or controlling water pumps.
  • US2005095150A1 describes a centrifugal multi-stage pump including a microcontroller implementing a series of algorithms for controlling the pump operation by varying the rotating speed of its motor depending on the various parameters, such as the discharge height, the rotating speed of the motor of the pump, the supply pressure and the presence or absence of supply, temperature, etc.
  • US646446 B2 relates to a controller for controlling operating parameters, such as the flow, speed or pressure of a centrifugal pump including a memory where data indicative of one or more operating conditions are recorded, one or more sensors fixed to the pump for detecting an operating condition and generating a signal indicative of same and a processor running an algorithm using the recorded data and the signal generated by the sensor to in turn generate a control signal representative of a correction factor to be applied to the pump which is, for example, relative to a variation in the rotating speed of the motor of the pump.
  • operating parameters such as the flow, speed or pressure of a centrifugal pump
  • a controller for controlling operating parameters, such as the flow, speed or pressure of a centrifugal pump including a memory where data indicative of one or more operating conditions are recorded, one or more sensors fixed to the pump for detecting an operating condition and generating a signal indicative of same and a processor running an algorithm using the recorded data and the signal generated by the sensor to in turn generate a control signal representative of a correction factor to be applied to the
  • EP1286240B1 describes a method for obtaining a curve of discharge height versus flow rate [Hinstalation(Q)] or electric consumption versus flow rate [Pinstalation(Q)] descriptive of the setpoint values of an installation for regulating the pumping capacity of a pump actuated by an electric motor the rotating speed of which is regulated, wherein a physical magnitude representative of the momentary pumping capacity of the pump is detected by means of a differential pressure sensor installed at the consumption point and a controller with an electric signal proportional to that physical magnitude is input as an actual value by means of which controller the rotating speed of the electric motor and thus the pumping capacity of the pump is regulated with the help of the curve descriptive of the setpoint values of the installation.
  • EP1286240B1 proposes obtaining the curve descriptive of the setpoint values which takes into consideration, at least by sections, the installation losses depending on the pumped flow rate by means of the opening of one or more consumption point every time, the detection of a functional service parameter of the consumption point, the momentary pump power variation until the consumer service parameter acquires a pre-set value and the obtainment of a pair of pump parameters which is representative of the momentary pumping capacity of the pump (such as H and Q or P and Q) at the time in which said pre-set value is acquired and the storage of those values.
  • a function is calculated by means of a mathematical curve plotting method from the saved values of the pair of pump parameters and that function is stored as a [Hinstalation(Q)] curve descriptive of the setpoint values of the installation.
  • US 5540555 describes a multipoint fluid distribution system which at least includes a primary pump and a variable speed secondary pump by means of which the fluid supply pressure for a plurality of consumption points requiring different supply pressures taken as setpoint pressures for said control is controlled and which includes a plurality of pressure sensors arranged in part of or in all said consumption points for remotely measuring the supply pressure and varying the values of the setpoint pressures depending on the measured pressures, varying the speed of the secondary pump depending on said setpoint pressure values.
  • the invention provides an alternative to the mentioned state of the art by means of an intelligent distribution system which allows adapting the operating condition and the performances offered by a centrifugal pump to the needs of demand at all times offering an suitable pressure according to the geometrical origin of the consumption point and allowing facilitating the user to modify (within pre-established margins) the supply conditions by selecting a specific performance level.
  • the objective of the invention is to achieve, by means of the method, a pumping control system and a centrifugal pump proposed to achieve a saving in pumped fluid and power when the centrifugal pump works in a minimum operating conditions suitable for providing sufficient pressure in the consumption points, thereby increasing the durability of the pumping installation.
  • a method for controlling a multipoint fluid distribution system which according to the prior art comprises:
  • said point of the distribution system where the mentioned pressure measurement is performed is a point previous to said consumption points through which the pumped fluid directed towards said consumption points flows and it is a preferably a point inside the pump or contiguous thereto, for example located in a discharge conduit close to same.
  • the method of the invention comprises performing the following steps in sequence:
  • Said variation of pump rotating speed of step b) will be an increase in speed if the measured pressure values (Pi) are below an initial setpoint pressure, or a decrease in said speed if said measured pressure values (Pi) are above said initial setpoint pressure.
  • said mathematical function descriptive of a curve of demand includes an opening constant of the consumption point as one of the mentioned coefficients, and the mentioned curve of demand refers to at least one opening constant per consumption point.
  • the method envisages calculating each of said flow rate values of step c) from the corresponding measured pressure value (Pi) and from a characteristic pump curve selected from a plurality of known characteristic pump curves previously recorded in the system (stored for example in a non-volatile, accessible memory), one per rotating speed, relating discharge height with flow rate,.
  • a proposal is made to use several bundles or sets of characteristic pump curves corresponding to different working conditions of said pump, including at least the temperature of the drive motor of the pump and operating time of the pump recorded in the system (also stored in an accessible memory). More precise and reliable flow rate calculations are thus achieved since they correspond with the operating situation of the pump at all times during its entire operation.
  • the features of the centrifugal pump will thus be input by means of a set of characteristic curves at different speeds and at different temperatures of the pump acquired in a laboratory.
  • the data can be input as a polynomial or as a point matrix. In the latter case linear or quadratic interpolations will be performed between the data to enable knowing any point of the curve.
  • the method comprises performing at least said steps a) to e) for locating two or more of said consumption points of the step d) in a different location.
  • the method comprises determining that said drop in pressure has been caused by one of the following reasons:
  • step c) a new curve of demand is determined from the coefficients of at least the previous curve of demand and the difference of the flow rates calculated in the new situation, from the successive readings of the pressure values in said previous point. If there were already two previous curves of demand obtained from previous situations of applying the method, the coefficients of said previously known two curves of demand would be taken into consideration, in addition to the difference in the flow rates calculated in the new situation with respect to the immediate preceding situation.
  • the method further envisages applying a correction to the location of the consumption point determined in step d), said correction comprising the consumption intensity measurement of the pump at all times and using known characteristic power curves of consumption /flow rate of the pump previously stored in the system.
  • said correction is only applied when the calculated flow rate values are below a predetermined threshold value, i.e., for flow rate values less than 1500 l/h, for example.
  • the invention also provides a piece of control equipment for controlling a multipoint fluid distribution system which provides fluid to a plurality of consumption points requiring different supply pressures, the control system comprising, according to a known structure, the following elements:
  • control equipment for implementing the proposed method described above and for such purpose the point of the distribution system where the pressure sensor is arranged is a point (advantageously inside the pump or contiguous thereto) previous to said consumption points through which the fluid directed to at least part of said consumption points flows, and the control system comprises at least one memory where the following are recorded:
  • control means include processing means, they have access to the values recorded in said memory and are configured for:
  • Figure 4 is a graph illustrating, in a diagram, flow rate/ time in different characterised consumption points of a dwelling: 19 (sink: 20a hot water, 20b cold water); 21 (wash basin), 22 (shower), 23 (taps), (24) bidet, 25 (WC), observing the disparity of the supply conditions that they require.
  • a proposal is made to use a centrifugal pump with a brushless DC type synchronous motor (although it is possible to use an alternating current motor) for the purpose of knowing the speed accurately and preventing the sliding of the motor from affecting the calculations to be made by computational means (for example a microcontroller integrated in a card).
  • the pressure sensor used is a digital transducer calibrated at different temperatures and with a 14 bit analogue/digital converter, for the purpose of obtaining sufficient resolution.
  • Tests have been carried out with a centrifugal pump with a check valve in the suction for facilitating precise pressure reading of the installation.
  • the proposed system is designed for a home pressure system of a single family dwelling and applied in a pump and frequency variator assembly for meeting the needs of such dwelling.
  • this concept is completely applicable, and even more appealing economically speaking, if its application is considered in the pressure system of a building with many floors where the differences between the maximum pressure required for the top floor and that required for lower floors are greater.
  • the proposed control system is also applicable to any industrial distribution system with a frequency variator which requires operating at different objective pressures automatically without the need for additional auxiliary elements or a costly installation.
  • Figure 2 shows the characteristic curve 11a of a centrifugal pump at a fixed frequency.
  • This characteristic curve relates the flow rate (Q) and the pressure (H):
  • H Q a ⁇ 1 ⁇ Q 3 + b ⁇ 1 ⁇ Q 2 + c ⁇ 1 ⁇ Q + d ⁇ 1 mca
  • H a ⁇ 2 ⁇ H 3 + b ⁇ 2 ⁇ H 2 + c ⁇ 2 ⁇ H + d ⁇ 2 m 3 / h
  • n ⁇ 1 ⁇ 0 ... ... actuai maximum 50 ⁇ Hz
  • Q 1 a ⁇ H 1 n 2 3 + b ⁇ H 1 n 2 2 + c ⁇ H 1 n 2 + d
  • the system With the control methods of a current constant pressure system, the system is able to work at the optimum pressure required according to the geometric origin 12 of the consumption point.
  • the origin detection method becomes complex when simultaneity situations arise between points of the same or different floors, which requires the definition of a more complex monitoring and control protocol, according to the method explained above and illustrated in Figure 3 for obtaining the curve 18 from curves of demand 16, 17 of two different consumption points.
  • the system With the possibility of detecting the consumption point 12 even in simultaneity situations, the system provides optimum performance in any possible demand situation.
  • the user can apply a correction coefficient to the desired pressure in the consumption point involving a positive or negative increase in said pressure, introducing for such purpose a correcting factor (within of a specified range) which will be taken into account in the future for calculating the subsequent curves of consumption.
  • Characterising a consumption point involves knowing its curve of demand, i.e., the flow rate provided for each pressure value.
  • the set of points can be taken both in ascending as descending direction. Therefore, when the pressure is below the setpoint the points will be taken in an ascending manner (from lower to higher speed and pressure) and when the pressure is above the setpoint they will be taken in a descending manner (from higher to lower speed and pressure).
  • the precision obtained will depend greatly on the number of points used. This depends both on the acceleration (the slower the variations the better) and on the range of variation of the points (the wider the better) having to adopt a compromise that assures comfort.
  • the calculated flow rate is different from that provided (greater or lesser), it means that the consumption points have changed and performing a new regression is necessary, but taking the flow rate variation with respect to that provided (Q c -Q p ) as data for the purpose of knowing the contribution of the new consumption point. If any consumption point (lower flow rate) has been closed, this variation will be negative, and the resulting negative k will be indicative of this decrease.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Fluid Pressure (AREA)

Claims (14)

  1. Verfahren zum Steuern eines Mehrstellen-Fluidverteilungssystems, aufweisend:
    Einstellen der Betriebsbedingungen des Motors einer Zentrifugalpumpe des Verteilungssystems durch Ermitteln eines Fluid-Versorgungsdruckes zum Versorgen einer Vielzahl von Verbrauchsstellen, die unterschiedliche Versorgungsdrücke erfordern können, die als die Pumpen-Sollwertdrücke abgelesen werden, und
    Messen des Versorgungsdruckes an wenigstens einer Stelle des Fluidverteilungssystems und Variieren der Sollwertdrücke in Abhängigkeit von dem gemessenen Druck,
    wobei es sich bei der Stelle des Verteilungssystems, an der die Druckmessung durchgeführt wird, um eine Stelle vor den Verbrauchsstellen handelt, durch die das gepumpte Fluid fließt, und wobei das Verfahren Durchführen der folgenden sequenziellen Schritte aufweist:
    a) permanentes Beziehen einer aufeinanderfolgenden Reihe von Versorgungsdruckwerten (Pi), die an der vorherigen Stelle gemessen wurden; und
    b) aufeinanderfolgendes Variieren der Pumpendrehgeschwindigkeit zum Kompensieren der Druckänderung in Reaktion auf eine Druckänderung, die an der vorherigen Stelle als Ergebnis der Messung von Schritt a) erfasst wurde;
    wobei das Verfahren dadurch gekennzeichnet ist, dass es des Weiteren aufweist:
    c) Erfassen, dass sich wenigstens zwei der Druckwerte (Pi1), (Pi2), die an den vorherigen Stellen gemessen wurden, in Reaktion auf die Änderung der Pumpendrehgeschwindigkeit erhöhen oder verringern, und Beziehen einer Bedarfskurve (10) durch Berechnen der Koeffizienten einer bekannten mathematischen Funktion, die die Bedarfskurve in Bezug zu der Auslaufhöhe und der Durchflussrate der Pumpe beschreibt, wobei die Berechnungen der Koeffizienten anhand der gemessenen Druckwerte (Pi1), (Pi2) und anhand der entsprechenden berechneten Durchflussratenwerte durchgeführt werden;
    d) Ermitteln einer Verbrauchsstelle (12), die dem Wert der Auslaufhöhe entspricht, der bezogen wird, wenn ein Durchflussratenwert angewendet wird, der dem Wert Null in der mathematischen Funktion entspricht, die die Bedarfskurve mit berechneten Koeffizienten beschreibt;
    e) Annehmen einer Pumpendrehgeschwindigkeit, die einen Pumpen-Sollwertdruck in Abhängigkeit von der in Schritt d) ermittelten Verbrauchsstelle bereitstellt und
    f) erneutes Beginnen der Schritte b) bis e) für den Fall, dass eine weitere Druckänderung in der Aufeinanderfolge von Werten erkannt wird, die in Schritt a) gemessen wurden, die eine Änderung des Bedarfes anzeigt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es sich bei der Änderung der Pumpendrehgeschwindigkeit von Schritt b) um eine Erhöhung handelt, wenn die gemessenen Druckwerte (Pi) unterhalb eines anfänglichen Sollwertdruckes liegen, oder um eine Verringerung handelt, wenn die gemessenen Druckwerte (Pi) oberhalb eines anfänglichen Sollwertdruckes liegen.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es Berechnen jeder der Durchflussratenweiie von Schritt c) anhand des entsprechenden gemessenen Druckwertes (Pi) und anhand einer charakteristischen Pumpenkurve aufweist, die aus einer Vielzahl von bekannten charakteristischen Pumpenkurven (11a, 11b, 11c, 11d, 11e, 11f) ausgewählt wird, die vorab in dem System, eine pro Drehgeschwindigkeit, in Bezug auf die Auslaufhöhe mit der Durchflussrate aufgezeichnet wurden.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass es Verwenden mehrerer Sätze oder Mengen an Pumpenkurven aufweist, die unterschiedlichen Betriebsbedingungen der Pumpe entsprechen, unter anderem wenigstens der Temperatur des Antriebsmotors der Pumpe und der Betriebszeit der Pumpe, die in dem System registriert sind.
  5. Verfahren nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die mathematische Funktion, die eine Bedarfskurve beschreibt, einen Anfangsfestwert der Verbrauchsstelle als einen der Koeffizienten aufweist und sich die Bedarfskurve auf wenigstens einen Anfangsfestwert je Verbrauchsstelle bezieht.
  6. Verfahren nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass es Durchführen wenigstens der Schritte a) bis c) für wenigstens Lokalisieren der Verbrauchsstellen von Schritt d) an einem anderen Ort aufweist.
  7. Verfahren nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass es des Weiteren Beziehen aufeinanderfolgender Messungen des Pumpensaugdruckes und Anwenden einer Korrektur der aufeinanderfolgenden Pumpenmessungen an der vorherigen Stelle aufweist, wobei der Wert des gemessenen Saugdruckes berücksichtigt wird.
  8. Verfahren nach einem beliebigen der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass, wenn nach dem Ermitteln der Verbrauchsstelle (12) oder der ersten Verbrauchsstelle in Schritt d) ein Abfall des Versorgungsdruckes an der Verteilersammelstelle erfasst wird, das Verfahren Ermitteln aufweist, dass der Druckabfall durch eine der folgenden Ursachen ausgelöst worden ist:
    i) weil die Durchflussrate der Verbrauchsstelle dahingehend modifiziert worden ist, dass sie einen zweiten Anfangsfestwert aufweist; oder
    ii) weil wenigstens eine zweite Verbrauchsstelle hinzugefügt worden ist, wobei in dem letzten Fall beiden Verbrauchsstellen Fluid über die Verteilersammelstelle eingespeist wird, wobei zwischen beiden Fällen dadurch unterschieden wird, dass entweder dieselbe oder eine andere Verbrauchsstelle in der neuen Bedarfskurve erfasst wird.
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass im Fall von i) eine dazugehörige resultierende Bedarfskurve, die die Bedarfskurven derselben Verbrauchsstelle für den ersten und den zweiten Anfangsfestwert zusammenlegt, bezogen und zum Variieren des Sollwertdruckes von Schritt e) verwendet wird.
  10. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass, wenn Ursache ii) in Schritt c) auftritt, die neue Bedarfskurve anhand der Koeffizienten von wenigstens der vorherigen Bedarfskurve und die Differenz der in der neuen Situation berechneten Durchflussraten anhand der aufeinanderfolgenden Ableseergebnisse der Druckwerte an der vorherigen Stelle ermittelt werden.
  11. Verfahren nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass es, sobald die Verbrauchsstelle identifiziert worden ist, Durchführen zusätzlicher Aufgaben zum Steuern und Überwachen der Verbrauchsstelle kundenspezifiziert lokal oder fern aufweist, sowie Betätigen der Pumpe und Modifizieren der Versorgungsbedingungen davon in einer vorab festgelegten Erweiterung aufweist.
  12. Verfahren nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass es sich bei der ersten Stelle der Druckmessung um eine Stelle innerhalb der Pumpe oder daran angeschlossen handelt.
  13. Verfahren nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass es des Weiteren Anwenden einer Korrektur auf die in Schritt d) ermittelte Stelle aufweist, wobei die Korrektur die Messung der durchgängigen Verbrauchsintensität der Pumpe unter Verwendung der bekannten charakteristischen Stromverbrauchskurven/Durchflussraten der Pumpe, die vorab in dem System gespeichert wurden, aufweist.
  14. Eine Steuergeräteeinheit zum Steuern eines Multipoint-Fluidverteilungssystems mittels Pumpen, wobei das Verteilungssystem einer Vielzahl von Verbrauchstellen, die unterschiedliche Versorgungsdrücke benötigen, Fluid bereitstellt und das Steuergerät aufweist:
    - wenigstens einen Drucksensor, der so eingerichtet ist, dass er den Versorgungsdruck an wenigstens einer Stelle des Fluid-Verteilungssystems misst;
    - Steuervorrichtung, die mit dem wenigstens einen Drucksensor und einer Reguliervorrichtung zum Regulieren der Pumpengeschwindigkeit in dem Fluid-Verteilungssystem verbunden ist und so konfiguriert ist, dass sie den Fluid-Versorgungsdruck für die Vielzahl von Verbrauchsstellen steuert, die Reguliervorrichtung ansteuert, verschiedene Versorgungsdrücke als Sollwertdrücke für die Steuerung abliest und die Werte der Sollwertdrücke in Abhängigkeit von dem durch den wenigstens einen Drucksensor gemessenen Druck variiert,
    wobei das System dadurch gekennzeichnet ist, dass es das vorgeschlagene Verfahren nach einem beliebigen der vorstehenden Ansprüche implementiert, dadurch, dass es sich bei der Stelle des Verteilungssystems, an dem der Drucksensor eingerichtet ist, um eine Stelle vor den Verbrauchsstellen handelt, durch die das an wenigstens einen Teil der Verbrauchsstellen gerichtete Fluid fließt, und dadurch, dass:
    - das Steuergerät wenigstens einen Speicher aufweist, in dem das Folgende gespeichert wird:
    - wenigstens eine bekannte mathematische Funktion, die eine Bedarfskurve (10) in Bezug auf die Auslaufhöhe und die Durchflussrate der Pumpe beschreibt, und
    - eine Vielzahl von charakteristischen Pumpenkurven, eine je Drehgeschwindigkeit, in Bezug auf die Auslaufhöhe mit der Durchflussrate bei verschiedenen Betriebsbedingungen;
    und dadurch, dass das Steuergerät Verarbeitungsvorrichtungen aufweist, die Zugriff auf die in dem Speicher aufgezeichneten Werte haben und so konfiguriert sind, dass sie:
    • den Drucksensor zum Durchführen von Schritt a) des Verfahrens steuern;
    • die Reguliervorrichtung zum Regulieren der Geschwindigkeit der Pumpe zum Durchführen von Schritt b) des Verfahrens steuern;
    • die Schritte c) und d) des Verfahrens mittels der Verarbeitungsvorrichtungen unter Verwendung von wenigstens den durch den Drucksensor gemessenen Werten und jenen Werten durchführen, die in dem wenigstens einen Speicher aufgezeichnet sind; und
    • Schritt e) des Verfahrens mittels der Verarbeitungsvoruchtungen in Abhängigkeit von dem in Schritt d) ermittelten Ort durchführen.
EP12382344.5A 2012-09-07 2012-09-07 Verfahren und Vorrichtung zur Steuerung eines Mehrpunktsystems zur Verteilung von Flussigkeit Active EP2562424B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES12382344.5T ES2541584T3 (es) 2012-09-07 2012-09-07 Método y equipo de control de un sistema de distribución de líquido, multipunto
EP12382344.5A EP2562424B1 (de) 2012-09-07 2012-09-07 Verfahren und Vorrichtung zur Steuerung eines Mehrpunktsystems zur Verteilung von Flussigkeit

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EP12382344.5A EP2562424B1 (de) 2012-09-07 2012-09-07 Verfahren und Vorrichtung zur Steuerung eines Mehrpunktsystems zur Verteilung von Flussigkeit

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EP2562424A2 EP2562424A2 (de) 2013-02-27
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EP2562424B1 true EP2562424B1 (de) 2015-05-27

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DE102014110911A1 (de) * 2014-07-31 2016-02-04 Xylem Ip Management S.À.R.L. Verfahren zum Betreiben eines Flüssigkeitsfördersystems und Förderpumpe
DE102014222390A1 (de) * 2014-11-03 2016-05-04 Continental Automotive Gmbh Verfahren zum Erstellen eines Kennlinienfelds einer Fluidpumpe, Verwendung eines limitierten Ventils, Verwendung eines Stufenventils und Steuergerät für ein Fluidfördersystem

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JPS6293498A (ja) * 1985-10-21 1987-04-28 Hitachi Ltd 速度制御ポンプの運転法
DE4243118A1 (de) * 1992-12-21 1994-06-23 Continental Ag Verfahren zur Konstanthaltung des Druckes in einem hydraulischen System
US5540555A (en) * 1994-10-04 1996-07-30 Unosource Controls, Inc. Real time remote sensing pressure control system using periodically sampled remote sensors
DE19831997A1 (de) * 1998-07-16 2000-01-20 Ewald Hennel Verfahren zur Regelung des Drucks eines Fluids
US6464464B2 (en) * 1999-03-24 2002-10-15 Itt Manufacturing Enterprises, Inc. Apparatus and method for controlling a pump system
EP1286240B1 (de) 2001-08-22 2004-08-11 Pumpenfabrik Ernst Vogel Gesellschaft m.b.H. Verfahren zur Ermittlung einer Pumpen-Regelkennlinie
US7407371B2 (en) 2003-10-29 2008-08-05 Michele Leone Centrifugal multistage pump

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EP2562424A2 (de) 2013-02-27
EP2562424A3 (de) 2013-03-13

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