EP2413774B1 - Method for operating a water conducting household device - Google Patents

Method for operating a water conducting household device Download PDF

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Publication number
EP2413774B1
EP2413774B1 EP10709493.0A EP10709493A EP2413774B1 EP 2413774 B1 EP2413774 B1 EP 2413774B1 EP 10709493 A EP10709493 A EP 10709493A EP 2413774 B1 EP2413774 B1 EP 2413774B1
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EP
European Patent Office
Prior art keywords
water
household device
rotational speed
conducting household
level
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EP10709493.0A
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German (de)
French (fr)
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EP2413774A2 (en
Inventor
Michael Rosenbauer
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Priority to PL10709493T priority Critical patent/PL2413774T3/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0047—Energy or water consumption, e.g. by saving energy or water
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/08—Drain or recirculation pump parameters, e.g. pump rotational speed or current absorbed by the motor
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/02—Water discharge, e.g. opening or closure of discharge valve

Definitions

  • the invention relates to a method for operating a water-conducting domestic appliance according to the preamble of claim 1.
  • Reduced water consumption is of great importance in water-bearing domestic appliances, such as a dishwasher.
  • a rinse is performed with a series of program steps with or without liquid insert.
  • the after a program step no longer required rinsing liquid is pumped out of the dishwasher by means of a drain pump.
  • fresh water is passed into the dishwasher.
  • a dishwasher is known, are detected in the emergency conditions during the flushing operation by monitoring the power consumption of the circulation pump.
  • exceptional conditions are, for example, a clogging of the filter or a blockade of the pump impeller of the circulation pump.
  • the speed or the direction of rotation of the circulation pump is changed.
  • the EP 0 255 863 A2 describes a method for operating a dishwasher, wherein in individual rinses a multi-course total rinse the degree of contamination of the rinsing liquid is determined and taken as a function of influence on the rinsing liquid. In order to achieve a reduction in the water and energy requirements and the program duration, after determining a minor degree of contamination at least one of the following complete Spülillonkeits grill or Operazzi remplissic is hidden in the Automatoireprogramm.
  • the object of the invention is to provide a method for operating a water-conducting household appliance, with which the water consumption can be reduced in a simple manner.
  • the invention is based on a method for operating a water-conducting domestic appliance, in particular a dishwasher, in which a Siebbelegungsgrad a switched in the hydraulic circuit of the household appliance filter system is detected.
  • the part of the rinsing liquid remaining in the water-conducting domestic appliance after partial pumping is applied to items to be cleaned.
  • the Siebbelegungsgrad the filter are detected. With only slight sieve occupancy, ie with only slightly contaminated rinsing liquid, therefore, the rinsing liquid used during the pre-rinsing step can be at least partially used in the subsequent cleaning step and thus the total water consumption can be reduced.
  • an additional amount of water is added to the remaining part of the rinsing liquid in the water-conducting household appliance in a filling step. That is, by a filling step, the water-carrying household appliance, e.g. increased so far that a minimum level for the operation of the water-bearing household appliance is achieved.
  • the Siebbelegungsgrad the filter system can be detected by a sensor device.
  • suitable sensors e.g. Ultrasonic sensors can be used, e.g. to detect a filter cake formation.
  • the sensor device may be designed for detecting the rotational speed and / or a power consumption of a motor which drives a circulating pump connected in the hydraulic circuit. Sizes such as e.g. Manipulated variables of a motor current controller and / or the frequency of an electronic commutation are detected.
  • the rotational speed and / or a power consumption of a circulating pump connected in the hydraulic circuit are detected to determine the level of screen loading. From a deviation of the detected speed or power consumption of a given characteristic can then be deduced in a simple manner on the Siebbelegungsgrad the filter system.
  • At least one speed curve of the circulating pump is evaluated to determine the degree of screen occupancy.
  • air is drawn from the circulating pump or the circulating pump partially idles.
  • the speed fluctuation of the circulation pump is therefore correspondingly large.
  • the speed fluctuation is minimal because of the circulating pump no air is drawn, but this works in normal circulation operation.
  • a measure of the speed fluctuations of the circulation pump is determined from the speed curve. Furthermore, it is provided in a development that the determined measure of speed fluctuations is compared with at least one predetermined limit value and is closed to a falling below the predetermined limit Siebbeschegungsgrads when the value for the determined measure of speed fluctuations is less than the predetermined limit value ,
  • the speed detection in the circulation pump is therefore not used to signal emergency conditions. Rather, the detected rotational speed of the circulation pump is based on a decision as to whether a partial pumping should take place during a liquid change or not.
  • the circulating pump is driven by means of a brushless DC motor.
  • a drive motor for the circulation pump e.g. an asynchronous motor or a synchronous motor can be used.
  • a synchronous motor is used.
  • Such a motor allows in a comparatively simple manner a detection of its speed solely by monitoring the time course of the electromotive force in the windings of the motor, that is, the currents or voltages occurring at the motor, so that costly, space-consuming sensors on the engine or The pump is not required to determine the speed.
  • a speed sensor is needed.
  • a brushless DC motor that is, a so-called BLDC motor
  • the induced back voltage for detecting the pump speed or for detecting the rotor position are used without separate sensors would have to be provided.
  • the rotational speed detection of the circulation pump can also take place on account of the phase shift of the force of the motor current applied to the pump motor.
  • a water-conducting household appliance in particular a dishwasher, at least comprising a hydraulic circuit with a filter system, the Siebbelegungsgrad is detectable, wherein from the water-bearing household appliance rinsing liquid is discharged, according to the invention when falling below a predetermined limit Siebbeschegungsgrades the rinsing liquid only partially dissipated from the household appliance.
  • Fig. 1 is an embodiment of a water-conducting household appliance, a dishwasher with a, a washing compartment delimiting washing container 1 shown schematically.
  • a washing compartment of the washing container In the washing compartment of the washing container 1, not to be cleaned, to be cleaned dishes in dish racks 3, 5 are arranged.
  • two spraying arms 7, 8 provided in different spraying levels are arranged by way of example, via which the items to be washed are supplied with washing liquid.
  • a pump pot 11 is provided with a coarsely indicated filter system in a known manner, which is formed from a flat fine filter 10 and a hollow cylindrical coarse filter 12. From the sump 11, a recirculation line 9 is guided away with circulating pump arranged therein.
  • the circulation line 9 is connected via leads 14, 15 and a switched therein Water switch 25 with the spray arms 7, 8 connected.
  • the circulation pump 13 is connected downstream of a heating element 21 as a water heater.
  • a fresh water supply line 16 and a drain line 17 is connected, in which a drain pump 18 is arranged for pumping out rinsing liquid from the washing.
  • Fig. 2 is a Spülprogrammablauf the dishwasher shown using a temperature-time diagram.
  • the program sequence has individual partial program steps with or without use of liquid, namely pre-rinsing V, cleaning R, intermediate rinsing Z, rinsing K and drying T.
  • the partial program steps of the rinse cycle are carried out by means of a control device 27 by corresponding activation of the respective device components, for example the drain pump 18 or the circulating pump 13.
  • the temperature-time profile refers to a mixing temperature in the washing compartment, which is set in the items to be washed, in the washing and possibly in the washing liquid.
  • the control device 27 is signal-wise connected via signal lines 26 to the circulation pump 13 and the drain pump 18 and other device components of the hydraulic circuit.
  • the pre-rinsing step V in which the controller 27, the water inlet valve 28 opens in the fresh water supply line 16, whereby fresh water enters the sump 11.
  • the rinsing liquid is pumped off by means of the drain pump 18.
  • the rotational speed of the circulation pump 13 is detected during the pre-purge step V and passed to the control device 27 via a signal line 29.
  • the control device 27 has an evaluation unit, which determines the screen occupancy level of the filter system 10, 12 from a deviation of the detected actual rotational speed from a predetermined characteristic.
  • the speed variation of the circulation pump 13 is detected during the pre-rinsing step V and compared with a predetermined speed fluctuation. This is based on the finding that at a large Siebbelegungsgrad the circulation pump 13 is partially idling or air pulls, causing correspondingly large speed fluctuations occur.
  • the circulating pump runs at a low level of sieve loading continuously without major fluctuations in speed.
  • the evaluation unit of the control device 27 during the pre-rinsing step V only a reduced actual Siebbelegungsgrad the filter system, that is, the actual Siebbelegungsgrad a predetermined GrenzSiebbelegungsgrad, so controls the controller 27, the drain pump 18 after execution of the pre-rinse step V so that only a partial pumping the rinsing liquid used takes place.
  • the non-pumped-off portion of the rinsing liquid remaining in the hydraulic circuit of the dishwasher is then used further in the subsequent rinsing step R. Accordingly, only a reduced amount of fresh water is required for the purification step R, which is, for example, refilled in a refilling step.
  • an intermediate rinsing step Z, a final rinse step K and a drying step T follow in a known manner.
  • a brushless DC motor with electronic commutation that is, a so-called BLDC motor is used in the present embodiment.
  • BLDC motor the reverse voltage or the position detection of the rotor, the counter-voltage or the back EMF is used in the simple way without the use of additional sensors, the speed is detected.
  • an additional speed sensor such as a Hall sensor, required.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Physical Water Treatments (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betreiben eines wasserführenden Haushaltsgeräts nach dem Oberbegriff des Patentanspruches 1.The invention relates to a method for operating a water-conducting domestic appliance according to the preamble of claim 1.

Ein reduzierter Wasserverbrauch ist bei wasserführenden Haushaltsgeräten, etwa einer Geschirrspülmaschine, von großer Bedeutung.Reduced water consumption is of great importance in water-bearing domestic appliances, such as a dishwasher.

Bei einer solchen gattungsgemäßen Geschirrspülmaschine wird ein Spülgang mit einer Reihe von Programmschritten mit bzw. ohne Flüssigkeitseinsatz durchgeführt. Die nach Ausführung eines Programmschrittes nicht mehr benötigte Spülflüssigkeit wird mittels einer Laugenpumpe aus der Geschirrspülmaschine abgepumpt. Für einen nachfolgenden Programmschritt wird dann Frischwasser in die Geschirrspülmaschine geleitet.In such a generic dishwasher, a rinse is performed with a series of program steps with or without liquid insert. The after a program step no longer required rinsing liquid is pumped out of the dishwasher by means of a drain pump. For a subsequent program step then fresh water is passed into the dishwasher.

Um während des Spülganges den Wasserverbrauch zu senken, ist es bekannt, mittels eines Aquasensors einen Verunreinigungsgrad der eingesetzten Spülflüssigkeit zu erfassen. In Abhängigkeit von der Höhe des Verunreinigungsgrades wird nach Ausführung des jeweiligen Programmschrittes ein Teilabpumpen durchgeführt, bei dem die Spülflüssigkeit nur teilweise aus der Geschirrspülmaschine abgeführt wird und der verbleibende Teil im folgenden Programmschritt weiter verwendet wird.In order to reduce water consumption during the rinse cycle, it is known to detect an impurity level of the rinsing liquid used by means of an aquasensor. Depending on the level of impurity level, a partial pumping is performed after execution of the respective program step, in which the rinsing liquid is only partially removed from the dishwasher and the remaining part is used in the following program step.

Der Einsatz eines solchen Aquasensors ist jedoch montagetechnisch aufwendig und mit Herstellungskosten verbunden.However, the use of such an aquasensor is technically complicated assembly and associated with manufacturing costs.

Aus der WO 2005/089621 A1 ist eine Geschirrspülmaschine bekannt, bei der Ausnahmezustände während des Spülbetriebes durch Überwachung des Stromverbrauches der Umwälzpumpe erfasst werden. Solche Ausnahmezustände sind beispielsweise ein Verstopfen des Filters oder eine Blockade des Pumpenlaufrades der Umwälzpumpe. Bei Erfassen eines solchen Ausnahmezustandes wird die Drehzahl bzw. die Drehrichtung der Umwälzpumpe geändert.From the WO 2005/089621 A1 a dishwasher is known, are detected in the emergency conditions during the flushing operation by monitoring the power consumption of the circulation pump. Such exceptional conditions are, for example, a clogging of the filter or a blockade of the pump impeller of the circulation pump. When detecting such a state of emergency, the speed or the direction of rotation of the circulation pump is changed.

Die EP 0 255 863 A2 beschreibt ein Verfahren zum Betreiben einer Geschirrspülmaschine, wobei in einzelnen Spülgängen eines mehrgängigen Gesamtspülganges der Verschmutzungsgrad der Spülflüssigkeit ermittelt und in Abhängigkeit davon Einfluss auf die Spülflüssigkeit genommen wird. Um hierbei eine Verminderung des Wasser- und Energiebedarfs sowie der Programmdauer zu erzielen, wird nach der Ermittlung eines minderen Verschmutzungsgrads wenigstens einer der im Gesamtspülprogramm nachfolgenden kompletten Spülflüssigkeitswechsel oder Teilspülflüssigkeitswechsel ausgeblendet.The EP 0 255 863 A2 describes a method for operating a dishwasher, wherein in individual rinses a multi-course total rinse the degree of contamination of the rinsing liquid is determined and taken as a function of influence on the rinsing liquid. In order to achieve a reduction in the water and energy requirements and the program duration, after determining a minor degree of contamination at least one of the following complete Spülflüssigkeitswechsel or Teilspülflüssigkeitswechsel is hidden in the Gesamtspülprogramm.

Ferner wird durch die US 6,182,674 B1 ein Verfahren offenbart, bei dem der Belegungsgrad eines Filters innerhalb einer Geschirrspülmaschine mit Hilfe eines Drucksensors detektiert wird. Bei Erreichen eines definierten Maximaldrucks werden schließlich Spülflotte und damit auch Verunreinigungen aus der Maschine abgepumpt.Furthermore, by the US 6,182,674 B1 discloses a method in which the degree of occupancy of a filter within a dishwasher is detected by means of a pressure sensor. When a defined maximum pressure is reached, rinsing liquor and thus also impurities are finally pumped out of the machine.

Die Aufgabe der Erfindung besteht darin, ein Verfahren zum Betrieb eines wasserführenden Haushaltsgeräts bereitzustellen, mit dem in einfacher Weise der Wasserverbrauch gesenkt werden kann.The object of the invention is to provide a method for operating a water-conducting household appliance, with which the water consumption can be reduced in a simple manner.

Die Erfindung geht aus von einem Verfahren zum Betreiben eines wasserführenden Haushaltsgerät, insbesondere einer Geschirrspülmaschine, bei dem ein Siebbelegungsgrad eines im Hydraulikkreislauf des Haushaltsgerätes geschalteten Filtersystems erfasst wird.The invention is based on a method for operating a water-conducting domestic appliance, in particular a dishwasher, in which a Siebbelegungsgrad a switched in the hydraulic circuit of the household appliance filter system is detected.

Gemäß dem kennzeichnenden Teil des Patentanspruches 1 wird bei Unterschreiten eines vorgegebenen Grenz-Siebbelegungsgrades die Spülflüssigkeit nur teilweise aus dem Haushaltsgerät abgeführt. Unterschreitet der erfasste Siebbelegungsgrad einen vorgegebenen Grenz-Siebbelegungsgrad, so erfolgt ein Teilabpumpen, bei dem nach Ausführung eines Programmschrittes mit Flüssigkeitseinsatz nicht die gesamte Spülflüssigkeit abgepumpt wird, sondern lediglich ein Teil der Spülflüssigkeit. Der im Haushaltsgerät verbleibende Teil der Spülflüssigkeit kann in folgenden Programmschritten mit Flüssigkeitseinsatz wieder verwendet werden, wodurch die Frischwasserzuführung reduziert werden kann.According to the characterizing part of claim 1 falls below a predetermined limit Siebbeschegungsgrades the rinsing liquid only partially removed from the household appliance. If the detected Siebbelegungsgrad falls below a predetermined limit Siebbeschegungsgrad, so there is a partial pumping, in which after execution of a program step with liquid insert not the entire flushing liquid is pumped, but only a portion of the washing liquid. The remaining in the household appliance part of the rinsing liquid can be used again in the following program steps with liquid insert, whereby the fresh water supply can be reduced.

In einer Weiterbildung wird der nach dem Teilabpumpen im wasserführenden Haushaltsgerät verbleibende Teil der Spülflüssigkeit auf zu reinigendes Spülgut aufgebracht. Im Falle einer Geschirrspülmaschine kann z.B. während eines Vorspülschritts der Siebbelegungsgrad des Filters erfasst werden. Bei nur geringfügiger Siebbelegung, d.h. bei nur geringfügig verschmutzter Spülflüssigkeit, kann daher die während des Vorspülschrittes verwendete Spülflüssigkeit zumindest teilweise im nachfolgenden Reinigungsschritt weiter verwendet werden und so der Gesamtwasserverbrauch reduziert werden.In a further development, the part of the rinsing liquid remaining in the water-conducting domestic appliance after partial pumping is applied to items to be cleaned. In the case of a dishwasher, for example, during a pre-rinse step the Siebbelegungsgrad the filter are detected. With only slight sieve occupancy, ie with only slightly contaminated rinsing liquid, therefore, the rinsing liquid used during the pre-rinsing step can be at least partially used in the subsequent cleaning step and thus the total water consumption can be reduced.

Ferner ist in einer Weiterbildung vorgesehen, dass in einem Füllschritt dem im wasserführenden Haushaltsgerät verbleibenden Teil der Spülflüssigkeit eine Zusatzmenge Wasser hinzugefügt wird. D.h., durch einen Füllschritt wird die im wasserführenden Haushaltsgerät z.B. soweit erhöht, dass ein Mindestniveau für den Betrieb des wasserführenden Haushaltsgeräts erreicht wird.Furthermore, it is provided in a development that an additional amount of water is added to the remaining part of the rinsing liquid in the water-conducting household appliance in a filling step. That is, by a filling step, the water-carrying household appliance, e.g. increased so far that a minimum level for the operation of the water-bearing household appliance is achieved.

In einer Weiterbildung kann der Siebbelegungsgrad des Filtersystems mittels einer Sensoreinrichtung erfasst werden. Hierzu können mit geeigneten Sensoren, z.B. Ultraschallsensoren, verwendet werden, um z.B. eine Filterkuchenbildung zu erfassen. Alternativ kann die Sensoreinrichtung zur Erfassung der Drehzahl und/oder eine Leistungsaufnahme eines Motors ausgebildet sein, der eine im Hydraulikkreislauf geschalteten Umwälzpumpe antreibt. Dabei können Größen wie z.B. Stellgrößen eines Motorstromreglers und/oder die Frequenz einer elektronischen Kommutierung erfasst werden.In a development, the Siebbelegungsgrad the filter system can be detected by a sensor device. For this purpose, with suitable sensors, e.g. Ultrasonic sensors can be used, e.g. to detect a filter cake formation. Alternatively, the sensor device may be designed for detecting the rotational speed and / or a power consumption of a motor which drives a circulating pump connected in the hydraulic circuit. Sizes such as e.g. Manipulated variables of a motor current controller and / or the frequency of an electronic commutation are detected.

In einer Weiterbildung ist vorgesehen, dass zum Ermitteln des Siebbelegungsgrads die Drehzahl und/oder eine Leistungsaufnahme einer im Hydraulikkreislauf geschalteten Umwälzpumpe erfasst werden. Aus einer Abweichung der erfassten Drehzahl bzw. Leistungsaufnahme von einer vorgegebenen Charakteristik kann dann in einfacher Weise auf den Siebbelegungsgrad des Filtersystems rückgeschlossen werden.In a further development, it is provided that the rotational speed and / or a power consumption of a circulating pump connected in the hydraulic circuit are detected to determine the level of screen loading. From a deviation of the detected speed or power consumption of a given characteristic can then be deduced in a simple manner on the Siebbelegungsgrad the filter system.

In einer weiteren Weiterbildung ist vorgesehen, dass zur Ermitteln des Siebbelegungsgrads wenigstens ein Drehzahlverlauf der Umwälzpumpe ausgewertet wird. Bei einem hohen Siebbelegungsgrad wird nämlich von der Umwälzpumpe Luft gezogen bzw. dreht sich die Umwälzpumpe teilweise im Leerlauf. Die Drehzahlschwankung der Umwälzpumpe ist daher entsprechend groß. Im Gegensatz dazu ist bei reduziertem Siebbelegungsgrad die Drehzahlschwankung minimal, da von der Umwälzpumpe keine Luft gezogen wird, sondern diese im normalen Umwälzbetrieb arbeitet.In a further development, it is provided that at least one speed curve of the circulating pump is evaluated to determine the degree of screen occupancy. In fact, with a high degree of screen loading, air is drawn from the circulating pump or the circulating pump partially idles. The speed fluctuation of the circulation pump is therefore correspondingly large. In contrast, with a reduced Siebbeschegungsgrad the speed fluctuation is minimal because of the circulating pump no air is drawn, but this works in normal circulation operation.

In einer Weiterbildung ist vorgesehen, dass aus dem Drehzahlverlauf ein Maß für Drehzahlschwankungen der Umwälzpumpe bestimmt wird. Ferner ist in einer Weiterbildung vorgesehen, dass das ermittelte Maß für Drehzahlschwankungen mit wenigstens einem vorgegebenen Grenz-Wert verglichen wird und auf ein Unterscheiten des vorgegebenen Grenz-Siebbelegungsgrads geschlossen wird wenn der Wert für das ermittelte Maß für Drehzahlschwankungen geringer ist als der vorgegebene Grenz-Wert.In a further development, it is provided that a measure of the speed fluctuations of the circulation pump is determined from the speed curve. Furthermore, it is provided in a development that the determined measure of speed fluctuations is compared with at least one predetermined limit value and is closed to a falling below the predetermined limit Siebbeschegungsgrads when the value for the determined measure of speed fluctuations is less than the predetermined limit value ,

Im Unterschied zum Stand der Technik wird die Drehzahlerkennung bei der Umwälzpumpe daher nicht zum Signalisieren von Ausnahmezuständen genutzt. Vielmehr wird die erfasste Drehzahl der Umwälzpumpe einer Entscheidung zugrunde gelegt, ob bei einem Flüssigkeitswechsel ein Teilabpumpen erfolgen soll oder nicht.In contrast to the prior art, the speed detection in the circulation pump is therefore not used to signal emergency conditions. Rather, the detected rotational speed of the circulation pump is based on a decision as to whether a partial pumping should take place during a liquid change or not.

In einer Weiterbildung ist vorgesehen, dass die Umwälzpumpe mittels eines bürstenlosen Gleichstrommotors angetrieben wird. Als Antriebsmotor für die Umwälzpumpe kann z.B. ein Asynchronmotor oder ein Synchronmotor eingesetzt werden. Bevorzugt wird jedoch ein Synchronmotor eingesetzt. Ein solcher Motor erlaubt auf vergleichsweise einfache Art und Weise eine Erfassung seiner Drehzahl allein durch Überwachung des zeitlichen Verlaufes der elektromotorischen Kraft in den Wicklungen des Motors, das heißt der an dem Motor auftretenden Ströme bzw. Spannungen, so dass kostspielige, bauraumaufwendige Sensoren am Motor bzw. der Pumpe zur Ermittlung der Drehzahl nicht erforderlich sind. Im Gegensatz dazu wird bei Verwendung eines Asynchronmotors zur Erkennung der Drehzahlschwankung ein Drehzahlsensor benötigt.In a further development, it is provided that the circulating pump is driven by means of a brushless DC motor. As a drive motor for the circulation pump, e.g. an asynchronous motor or a synchronous motor can be used. Preferably, however, a synchronous motor is used. Such a motor allows in a comparatively simple manner a detection of its speed solely by monitoring the time course of the electromotive force in the windings of the motor, that is, the currents or voltages occurring at the motor, so that costly, space-consuming sensors on the engine or The pump is not required to determine the speed. In contrast, when using an asynchronous motor to detect the speed fluctuation, a speed sensor is needed.

Weiterhin bevorzugt kann ein bürstenloser Gleichstrommotor, das heißt ein sogenannter BLDC-Motor verwendet werden, bei dem die induzierte Gegenspannung zur Erfassung der Pumpendrehzahl bzw. zur Erfassung der Rotorposition benutzt werden, ohne dass separate Sensoren vorgesehen werden müssten. Alternativ zur Erfassung der Gegenspannung des BLDC-Motors kann die Drehzahlerkennung der Umwälzpumpe auch aufgrund der Phasenverschiebung der am Pumpenmotor angelegten Kraft des Motorstromes erfolgen.Further preferably, a brushless DC motor, that is, a so-called BLDC motor can be used, in which the induced back voltage for detecting the pump speed or for detecting the rotor position are used without separate sensors would have to be provided. As an alternative to detecting the countervoltage of the BLDC motor, the rotational speed detection of the circulation pump can also take place on account of the phase shift of the force of the motor current applied to the pump motor.

Ferner wird Aufgabe der Erfindung gelöst durch ein wasserführendes Haushaltsgerät, insbesondere eine Geschirrspülmaschine, wenigstens aufweisend einen Hydraulikkreislauf mit einem Filtersystem, dessen Siebbelegungsgrad erfassbar ist, wobei aus dem wasserführenden Haushaltsgerät Spülflüssigkeit abführbar ist, bei dem erfindungsgemäß bei Unterschreiten eines vorgegebenen Grenz-Siebbelegungsgrades die Spülflüssigkeit nur teilweise aus dem Haushaltsgerät abführbar ist.Further object of the invention is achieved by a water-conducting household appliance, in particular a dishwasher, at least comprising a hydraulic circuit with a filter system, the Siebbelegungsgrad is detectable, wherein from the water-bearing household appliance rinsing liquid is discharged, according to the invention when falling below a predetermined limit Siebbeschegungsgrades the rinsing liquid only partially dissipated from the household appliance.

Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Further developments of the invention are specified in the subclaims.

Nachfolgend ist ein Ausführungsbeispiel der Erfindung anhand der beigefügten Figuren beschrieben. Es zeigen:

Fig. 1
in einer schematischen Prinzipdarstellung eines Ausführungsbeispiels eines Geschirrspülmaschine zur Durchführung des erfindungsgemäßen Spülverfahrens; und
Fig. 2
ein Temperatur-Zeit-Diagramm zur Veranschaulichung der in einem Spülgang durchgeführten Programmschritte.
Hereinafter, an embodiment of the invention with reference to the accompanying figures will be described. Show it:
Fig. 1
in a schematic schematic diagram of an embodiment of a dishwasher for performing the rinsing method according to the invention; and
Fig. 2
a temperature-time diagram illustrating the program steps performed in a rinse.

Es wird zuerst auf Fig. 1 Bezug genommen.It will be up first Fig. 1 Referenced.

In der Fig. 1 ist als Ausführungsbeispiel für ein wasserführendes Haushaltsgerät eine Geschirrspülmaschine mit einem, einen Spülraum begrenzenden Spülbehälter 1 schematisch dargestellt. Im Spülraum des Spülbehälters 1 kann nicht dargestelltes, zu reinigendes Spülgut in Geschirrkörben 3, 5 angeordnet werden. Im gezeigten Spülbehälter 1 sind beispielhaft zwei in unterschiedlichen Sprühebenen vorgesehene Sprüharme 7, 8 angeordnet, über die das Spülgut mit Spülflüssigkeit beaufschlagt wird. Im Spülbehälterboden ist in bekannter Weise ein Pumpentopf 11 mit einem nur grob angedeuteten Filtersystem vorgesehen, das aus einem flächigen Feinfilter 10 und einem hohlzylindrischen Grobfilter 12 gebildet ist. Vom Pumpentopf 11 ist eine Umwälzleitung 9 mit darin angeordneter Umwälzpumpe weggeführt. Die Umwälzleitung 9 ist über Zuleitungen 14, 15 sowie über eine darin geschaltete Wasserweiche 25 mit den Sprüharmen 7, 8 verbunden. Der Umwälzpumpe 13 ist als Wasserheizung ein Heizelement 21 nachgeschaltet.In the Fig. 1 is an embodiment of a water-conducting household appliance, a dishwasher with a, a washing compartment delimiting washing container 1 shown schematically. In the washing compartment of the washing container 1, not to be cleaned, to be cleaned dishes in dish racks 3, 5 are arranged. In the washing container 1 shown, two spraying arms 7, 8 provided in different spraying levels are arranged by way of example, via which the items to be washed are supplied with washing liquid. In Spülbehälterboden a pump pot 11 is provided with a coarsely indicated filter system in a known manner, which is formed from a flat fine filter 10 and a hollow cylindrical coarse filter 12. From the sump 11, a recirculation line 9 is guided away with circulating pump arranged therein. The circulation line 9 is connected via leads 14, 15 and a switched therein Water switch 25 with the spray arms 7, 8 connected. The circulation pump 13 is connected downstream of a heating element 21 as a water heater.

Am Pumpentopf 11 ist außerdem eine Frischwasserzuleitung 16 sowie eine Ablaufleitung 17 angeschlossen, in der eine Laugenpumpe 18 zum Abpumpen von Spülflüssigkeit aus dem Spülbehälter angeordnet ist.At the sump 11 also a fresh water supply line 16 and a drain line 17 is connected, in which a drain pump 18 is arranged for pumping out rinsing liquid from the washing.

Es wird nun zusätzlich auf Fig. 2 Bezug genommen.It is now additionally on Fig. 2 Referenced.

In der Fig. 2 ist ein Spülprogrammablauf der Geschirrspülmaschine anhand eines Temperatur-Zeit-Diagramms gezeigt. Der Programmablauf weist einzelne Teilprogrammschritte mit bzw. ohne Flüssigkeitseinsatz auf, nämlich Vorspülen V, Reinigen R, Zwischenspülen Z, Klarspülen K sowie Trocknen T auf. Die Teilprogrammschritte des Spülganges werden mittels einer Steuereinrichtung 27 durch entsprechendes Ansteuern der jeweiligen Gerätekomponenten, etwa der Laugenpumpe 18 oder der Umwälzpumpe 13, ausgeführt. Das Temperatur-Zeit-Profil bezieht sich auf eine Mischungstemperatur im Spülraum, die sich im Spülgut, im Spülbehälter und ggf. in der Spülflüssigkeit einstellt.In the Fig. 2 is a Spülprogrammablauf the dishwasher shown using a temperature-time diagram. The program sequence has individual partial program steps with or without use of liquid, namely pre-rinsing V, cleaning R, intermediate rinsing Z, rinsing K and drying T. The partial program steps of the rinse cycle are carried out by means of a control device 27 by corresponding activation of the respective device components, for example the drain pump 18 or the circulating pump 13. The temperature-time profile refers to a mixing temperature in the washing compartment, which is set in the items to be washed, in the washing and possibly in the washing liquid.

Die Steuereinrichtung 27 ist über Signalleitungen 26 signaltechnisch mit der Umwälzpumpe 13 sowie der Laugenpumpe 18 und anderen Gerätekomponenten des Hydraulikkreislaufes verbunden.The control device 27 is signal-wise connected via signal lines 26 to the circulation pump 13 and the drain pump 18 and other device components of the hydraulic circuit.

Nachfolgend ist der Spülgang der Geschirrspülmaschine, soweit er zum Verständnis der Erfindung erforderlich ist, anhand der Temperatur-Zeit-Profils der Fig. 2 beschrieben:Below is the rinse cycle of the dishwasher, where it is necessary for understanding the invention, based on the temperature-time profile of Fig. 2 described:

Nach dem Start des Spülganges zum Zeitpunkt t0 erfolgt der Vorspülschritt V, bei dem die Steuereinrichtung 27 das Wassereinlaufventil 28 in der Frischwasserzuleitung 16 öffnet, wodurch Frischwasser in den Pumpentopf 11 gelangt. Nach Ausführung des Vorspülschrittes V, das heißt zum Zeitpunkt t1, wird die Spülflüssigkeit mittels der Laugenpumpe 18 abgepumpt.After the start of the rinse cycle at the time t 0 , the pre-rinsing step V, in which the controller 27, the water inlet valve 28 opens in the fresh water supply line 16, whereby fresh water enters the sump 11. After execution of the pre-rinsing step V, that is to say at the time t 1 , the rinsing liquid is pumped off by means of the drain pump 18.

Erfindungsgemäß wird während des Vorspülschrittes V die Drehzahl der Umwälzpumpe 13 erfasst und über eine Signalleitung 29 zur Steuereinrichtung 27 geleitet. Die Steuereinrichtung 27 weist eine Auswerteeinheit auf, die aus einer Abweichung der erfassten Ist-Drehzahl von einer vorgegebenen Charakteristik den Siebbelegungsgrad des Filtersystems 10, 12 bestimmt. Insbesondere wird dabei die Drehzahlschwankung der Umwälzpumpe 13 während des Vorspülschrittes V erfasst und mit einer vorgegebenen Drehzahlschwankung verglichen. Dem liegt die Erkenntnis zugrunde, dass bei einem großen Siebbelegungsgrad die Umwälzpumpe 13 teilweise im Leerlauf läuft bzw. Luft zieht, wodurch entsprechend große Drehzahlschwankungen auftreten. Bei geringem Siebbelegungsgrad läuft die Umwälzpumpe demgegenüber kontinuierlich ohne größere Drehzahlschwankungen.According to the invention, the rotational speed of the circulation pump 13 is detected during the pre-purge step V and passed to the control device 27 via a signal line 29. The control device 27 has an evaluation unit, which determines the screen occupancy level of the filter system 10, 12 from a deviation of the detected actual rotational speed from a predetermined characteristic. In particular, while the speed variation of the circulation pump 13 is detected during the pre-rinsing step V and compared with a predetermined speed fluctuation. This is based on the finding that at a large Siebbelegungsgrad the circulation pump 13 is partially idling or air pulls, causing correspondingly large speed fluctuations occur. In contrast, the circulating pump runs at a low level of sieve loading continuously without major fluctuations in speed.

Bestimmt die Auswerteeinheit der Steuereinrichtung 27 während des Vorspülschrittes V einen lediglich reduzierten Ist-Siebbelegungsgrad des Filtersystems, das heißt unterschreitet der Ist-Siebbelegungsgrad einen vorgegebenen GrenzSiebbelegungsgrad, so steuert die Steuereinrichtung 27 die Laugenpumpe 18 nach Ausführung des Vorspülschrittes V so an, dass lediglich ein Teilabpumpen der verwendeten Spülflüssigkeit erfolgt. Der im Hydraulikkreislauf der Geschirrspülmaschine verbleibende, nicht abgepumpte Teil der Spülflüssigkeit wird dann im darauffolgenden Reinigungsschritt R weiter verwendet. Entsprechend wird für den Reinigungsschritt R lediglich eine reduzierte Frischwassermenge benötigt, die bspw. in einem Nachfüllschritt nachgefüllt wird.If the evaluation unit of the control device 27 during the pre-rinsing step V only a reduced actual Siebbelegungsgrad the filter system, that is, the actual Siebbelegungsgrad a predetermined GrenzSiebbelegungsgrad, so controls the controller 27, the drain pump 18 after execution of the pre-rinse step V so that only a partial pumping the rinsing liquid used takes place. The non-pumped-off portion of the rinsing liquid remaining in the hydraulic circuit of the dishwasher is then used further in the subsequent rinsing step R. Accordingly, only a reduced amount of fresh water is required for the purification step R, which is, for example, refilled in a refilling step.

Nach dem Reinigungsschritt R folgen in bekannter Weise ein Zwischenspülschritt Z, ein Klarspülschritt K sowie ein Trocknungsschritt T.After the cleaning step R, an intermediate rinsing step Z, a final rinse step K and a drying step T follow in a known manner.

Als Antriebsmotor für die Umwälzpumpe 13 wird im vorliegenden Ausführungsbeispiel ein bürstenloser Gleichstrommotor mit elektronischer Kommutation, das heißt ein sogenannter BLDC-Motor, verwendet. Bei Verwendung eines BLDC-Motors wird zur Drehzahlerkennung bzw. zur Positionsdetektion des Rotors die Gegenspannung bzw. die Gegen-EMK benutzt, bei der in einfacher Weise ohne Verwendung zusätzlicher Sensoren die Drehzahl erfassbar ist. Im Unterschied dazu ist bei Verwendung eines Asynchronmotors ein zusätzlicher Drehzahlsensor, etwa ein Hall-Sensor, erforderlich.As a drive motor for the circulation pump 13, a brushless DC motor with electronic commutation, that is, a so-called BLDC motor is used in the present embodiment. When using a BLDC motor, the reverse voltage or the position detection of the rotor, the counter-voltage or the back EMF is used in the simple way without the use of additional sensors, the speed is detected. In contrast, when using an asynchronous motor, an additional speed sensor, such as a Hall sensor, required.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

11
Spülbehälterrinse tank
3, 53, 5
Geschirrkörbebaskets
7, 87, 8
Sprüharmespray arms
1010
Feinfilterfine filter
1111
Pumpentopfsump
1212
hohlzylindrischer Grobfilterhollow cylindrical coarse filter
1313
Umwälzpumpecirculating pump
14, 1514, 15
Flüssigkeitsleitungenfluid lines
1616
FrischwasserzuleitungFresh water supply
1717
Ablaufleitungdrain line
1818
LaugenpumpeDrain pump
2121
Heizelementheating element
2525
Wasserweichewater points
2626
Signalleitungensignal lines
2727
Steuereinrichtungcontrol device
2828
WassereinlaufventilWater inlet valve
2929
Signalleitungsignal line
V, R, Z, K, TV, R, Z, K, T
Programmschritteprogram steps

Claims (20)

  1. Method for operating a water-conducting household device, in particular a dishwashing machine, wherein the level of filter contamination of a filtration system (10, 12) connected in the hydraulic circuit of the household device is detected, characterised in that wash liquid is only partially discharged out of the household device when it is detected that a predetermined threshold level of filter contamination has been undershot.
  2. Method according to claim 1, characterised in that the portion of the wash liquid remaining in the water-conducting household device after partial discharge is applied to the items to be cleaned.
  3. Method according to claim 2, characterised in that in a filling step an additional quantity of water is added to the portion of the wash liquid remaining in the water-conducting household device.
  4. Method according to at least one of claims 1 to 3, characterised in that the level of filter contamination of the filtration system (10, 12) is detected by means of a sensor device.
  5. Method according to claim 4, characterised in that for determining the level of filter contamination the rotational speed and/or a power consumption of a circulation pump (13) connected in the hydraulic circuit are/is detected.
  6. Method according to claim 5, characterised in that for determining the level of filter contamination at least one rotational speed profile of the circulation pump (13) is evaluated.
  7. Method according to claim 6, characterised in that a measure for rotational speed fluctuations of the circulation pump (13) is determined from the rotational speed profile.
  8. Method according to claim 7, characterised in that the measure for rotational speed fluctuations which has been determined is compared with at least one predetermined threshold value, and it is concluded that the predetermined threshold level of filter contamination has been undershot if the value of the determined measure for rotational speed fluctuations is lower than the predetermined threshold value.
  9. Method according to one of the preceding claims 1 to 8, characterised in that for the purpose of applying wash liquid to items to be cleaned a circulation pump (13) is driven by means of a brushless DC motor.
  10. Method according to claim 9, characterised in that for the purpose of determining the rotational speed of the brushless DC motor an induced back electromotive force and/or a phase shift between the electrical voltage applied to the DC motor and the motor current are/is detected.
  11. Water-conducting household device, in particular a dishwashing machine, at least comprising a hydraulic circuit with a filtration system (10, 12) whose level of filter contamination is detectable, characterised in that wash liquid can be discharged only partially from the household device when it is detected that the predetermined threshold level of filter contamination has been undershot.
  12. Water-conducting household device according to claim 11, characterised in that the portion of wash liquid remaining in the water-conducting household device after partial pumping-out may be applied to items to be cleaned.
  13. Water-conducting household device according to claim 12, characterised in that in a filling step an additional quantity of water may be added to the portion of wash liquid remaining in the water-conducting household device.
  14. Water-conducting household device according to claim 11, 12 or 13, characterised in that a sensor device is provided for detecting the level of filter contamination of the filtration system (10, 12).
  15. Water-conducting household device according to claim 14, characterised in that the rotational speed and/or power consumption of a circulation pump (13) connected in the hydraulic circuit may be detected for the purpose of determining the level of filter contamination.
  16. Water-conducting household device according to claim 15, characterised in that a control device (27) is provided which is embodied for determining the level of filter contamination for evaluating at least one rotational speed profile of the circulation pump (13).
  17. Water-conducting household device according to claim 16, characterised in that the control device (27) is embodied for determining a measure for rotational speed fluctuations of the circulation pump (13) from the rotational speed profile.
  18. Water-conducting household device according to claim 17, characterised in that the control device (27) is embodied for comparing the determined measure for rotational speed fluctuations with at least one predetermined threshold value and it may be concluded that the predetermined threshold level of filter contamination has been undershot if the value of the determined measure for rotational speed fluctuations is lower than the predetermined threshold value.
  19. Water-conducting household device according to at least one of claims 11 to 18, characterised in that a brushless DC motor is provided for driving the circulation pump (13).
  20. Water-conducting household device according to claim 19, characterised in that a control device (27) is provided by means of which an induced back electromotive force and/or a phase shift between the electrical voltage applied to the DC motor and the motor current may be detected for the purpose of determining the rotational speed of the brushless DC motor.
EP10709493.0A 2009-04-02 2010-03-16 Method for operating a water conducting household device Active EP2413774B1 (en)

Priority Applications (1)

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PL10709493T PL2413774T3 (en) 2009-04-02 2010-03-16 Method for operating a water conducting household device

Applications Claiming Priority (2)

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DE102009002150A DE102009002150A1 (en) 2009-04-02 2009-04-02 Method for operating a water-conducting household appliance
PCT/EP2010/053354 WO2010112331A2 (en) 2009-04-02 2010-03-16 Method for operating a water conducting household device

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EP2413774A2 EP2413774A2 (en) 2012-02-08
EP2413774B1 true EP2413774B1 (en) 2015-01-07

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US (1) US20120006360A1 (en)
EP (1) EP2413774B1 (en)
DE (1) DE102009002150A1 (en)
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WO (1) WO2010112331A2 (en)

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PL2413774T3 (en) 2015-05-29
US20120006360A1 (en) 2012-01-12
WO2010112331A2 (en) 2010-10-07
EP2413774A2 (en) 2012-02-08
DE102009002150A1 (en) 2010-10-07
WO2010112331A3 (en) 2010-11-25

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