EP0727179B1 - Method for operating a dishwasher and dishwasher - Google Patents

Method for operating a dishwasher and dishwasher Download PDF

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Publication number
EP0727179B1
EP0727179B1 EP96100441A EP96100441A EP0727179B1 EP 0727179 B1 EP0727179 B1 EP 0727179B1 EP 96100441 A EP96100441 A EP 96100441A EP 96100441 A EP96100441 A EP 96100441A EP 0727179 B1 EP0727179 B1 EP 0727179B1
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Prior art keywords
value
wash
cycle
water
subsequent
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EP96100441A
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German (de)
French (fr)
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EP0727179A3 (en
EP0727179A2 (en
Inventor
Oliver Dipl.-Ing. Wick
Werner Dipl.-Ing. Braun
Walter Dipl.-Ing. Sams
Jürgen Vogel
Rainer Dr. Dipl.-Phys. Stamminger
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AEG Hausgeraete GmbH
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AEG Hausgeraete GmbH
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Classifications

    • 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
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention
    • 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
    • A47L2401/04—Crockery or tableware details, e.g. material, quantity, condition
    • 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
    • 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
    • A47L2401/12—Water temperature
    • 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
    • A47L2401/14—Water pressure or flow rate
    • 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
    • A47L2401/30—Variation of electrical, magnetical or optical quantities
    • 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
    • A47L2501/01—Water supply, e.g. opening or closure of the water inlet valve
    • 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
    • A47L2501/04—Water pressure or flow rate
    • 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
    • A47L2501/05—Drain or recirculation pump, e.g. regulation of the pump rotational speed or flow direction
    • 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
    • A47L2501/06—Water heaters
    • 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
    • A47L2501/07—Consumable products, e.g. detergent, rinse aids or salt
    • 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
    • A47L2501/26—Indication or alarm to the controlling device or to the user
    • 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
    • A47L2501/30—Regulation of machine operational steps within the washing process, e.g. performing an additional rinsing phase, shortening or stopping of the drying phase, washing at decreased noise operation conditions

Definitions

  • the invention relates to a method for operating a Dishwasher according to the preamble of claim 1 and a dishwasher according to the preamble of Claim 11.
  • This flushing method has the disadvantage that the Filling the dishwasher in the first wash is fixed regardless of the current load and the cleaning of the wash items adapted to the load only starts after the first rinse. Starts about it addition to the wash program with a pre-wash phase in which usually there is no heating of the rinsing liquid, so this procedure cannot be used.
  • the invention has for its object a method according to the preamble of claim 1 and one Dishwasher according to the preamble of the claim 11 so that a cleaning of a brought washware with particularly good to this load adapted water and energy consumption in every phase of the running washing program is enabled.
  • the in the amount of dishes placed in the washing compartment automatically recognized what is determined for what amount of water is necessary to the surface of the introduced To wet dishes according to operational requirements. The more water for this wetting is needed, even more so The surface of the dishes and, if applicable, the mass of crockery is usually available. Depending on the surface to be cleaned Dishes are also the time, the amount of water and the Amount of detergent in the washing process for a decent Cleaning must be available.
  • the load-dependent wetting value corresponds to the Difference from this inflow water quantity and one Default value, which results from the filling quantity if there is no Loading the dishwashing room results. In the same way you can also check the load in the cleaning rinse determine.
  • the gradient value represents thus represents a measure of the existing tableware mass after the rinse tank heater has a constant output. Since both the wetting value or the wetting values and the temperature gradient value, however, only fuzzy quantities represent, these values are preferably a fuzzy control fed, based on in tables stored fuzzy characteristics the degree of loading approximate. Thereby become one decreasing wetting value and / or to higher Temperature gradient values towards partial rinse cycles from the Dishwashing program omitted or intertwined reduced program duration transferred. In addition or alternatively it can also lead to a decreasing wetting value and / or towards higher temperature gradient values a reduction in pump performance or spray pressure with which rinsing liquid to wash on Is well promoted.
  • a dishwasher to carry out a load dependent the wash program to be changed assigns in one cleaning dishes can be rotated to the loading rinsing container stored spray arms, which from one of the drain pan of the circulating pump fed with circulating liquid be loaded.
  • Fresh water inlet solenoid valves are provided that like the circulation pump can be controlled according to the program.
  • there be the one or the each from the pressure sensors determined water supply quantities determined differential values and / or the actual temperature gradient value when heating the rinsing liquid using Fuzzy rules and identified membership functions fuzzy in such a way that load-dependent Control signals are generated which the program control to change the basic wash program become. It is preferably used to determine the water inflow quantity a digital pressure switch, whose control signals in immediately processed by a digital controller can be.
  • the pressure switch then gives a control signal to interrupt the inflow of water to the Program control from when the rinse level in the rinse tank for water saving has reached a height at which of the running circulating pump just the amount of feed water in the drain pan is available for your proper operation with possibly reduced loading is required.
  • a pressure sensor can be used for this get to a predetermined level in the drain pan controls.
  • the pressure sensor can also be used by the Circulating pump measure pressure generated and the interruption of the feed valve then control when the fluctuation amplitude of the pump pressure a certain value has fallen below, where it can be assumed that none Air is sucked in.
  • the default value already mentioned cannot only be a empirically determined fixed value or the inflow quantity correspond to those with the circulation pump running and without loading dishes is necessary, it can also increase the amount of feed water correspond to the last water-fed Rinse cycle of the previous completed wash program has been determined after there before the water supply Crockery was wet anyway.
  • the load-dependent control is preferably controlled according to fuzzy rules, especially with Partial load kept the consumption values low and kept to a minimum even with standard loading. It is irrelevant where the dishes are with partial loads is arranged in the washing container.
  • the basic wash program to be changed is the basis of the Cleaning conditions based on a specified load, compared to which is useful for load changes Changes to the wash program sequence can be made.

Landscapes

  • Washing And Drying Of Tableware (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Geschirrspülmaschine gemäß dem Oberbegriff des Anspruches 1 sowie eine Geschirrspülmaschine gemäß dem Oberbegriff des Anspruches 11.The invention relates to a method for operating a Dishwasher according to the preamble of claim 1 and a dishwasher according to the preamble of Claim 11.

Beim Betrieb von Haushaltsgeschirrspülmaschinen wird ein Grundspülprogramm vorgegeben, das auf maximale Reinigungsbedingungen des zu spülenden Geschirrs abgestimmt ist. Um dabei eine Anpassung an eine verminderte Beladung zu erreichen, ist eine 1/2-Taste vorgesehen, durch die eine Teilbeladung berücksichtigt wird, wobei dann das zu reinigende Geschirr beispielsweise nur im Oberkorb gespült wird. Die Betätigung dieser 1/2-Taste führt zu fehlerhaften Spülprozessen, wenn eine volle Maschine bei betätigter Taste gespült wird oder eine nur mäßig beladene Maschine bei unbetätigter Taste dennoch das volle Grundspülprogramm abarbeitet.When operating household dishwashers, a Basic washing program specified, based on maximum cleaning conditions of the dishes to be washed is matched. Around thereby adapting to a reduced load reach, a 1/2 button is provided, through which one Partial load is taken into account, which then too cleaning dishes, for example, only rinsed in the upper basket becomes. Pressing this 1/2 key will result in errors Flushing processes when a full machine is operated Button is flushed or a machine that is only moderately loaded if the button is not pressed, the full basic wash program processed.

Damit solche Bedienfehler vermieden sind und sich manuelle Eingriffe in das Spülprogramm erübrigen, ist in der FR-A-2 574 645 ein Spülverfahren vorgeschlagen, ein gerade ablaufendes Spülprogramm aufgrund der Aufheizgeschwindigkeit einer Spülflüssigkeit in einem ersten Spülgang des Spülprogrammes abzuändern. Dabei wird zunächst eine fest eingestellte Wassermenge in die Geschirrspülmaschine geleitet, in der diese während des ersten Spülganges auf eine vorbestimmt Temperatur aufgeheizt wird. Das für das Aufheizen benötigte Zeitintervall wird ermittelt und mit Zeitintervallen verglichen, die jeweils zum Aufheizen einer voll beladenen sowie einer unbeladenen Geschirrspülmaschine benötigt werden. Aus diesem Vergleich wird die für das gerade ablaufende Spülprogramm vorliegende Beladung abgeleitet und daraus für den weiteren Verlauf des Spülprogrammes Spülparameter, wie z.B. die in den nächsten Spülgängen benötigte Wassermenge, eingestellt.So that such operating errors are avoided and manual There is no need to intervene in the washing program in the FR-A-2 574 645 proposed a flushing method, a straight Rinsing program running due to the heating speed a rinsing liquid in a first rinse Modify washing program. First, one becomes fixed set amount of water in the dishwasher passed in during the first rinse a predetermined temperature is heated. That for that Heating time required is determined and with Time intervals compared, each for heating one fully loaded and an unloaded dishwasher are needed. This comparison becomes the one for the current washing program in progress derived and from this for the further course of the Washing parameters, e.g. the next Amount of water required for rinse cycles.

Dieses Spülverfahren weist den Nachteil auf, daß die Befüllung der Geschirrspülmaschine im ersten Spülgang unabhängig von der aktuellen Beladung fest vorgegeben ist und die an die Beladung angepaßte Reinigung des Spülgutes erst nach dem ersten Spülgang einsetzt. Beginnt darüber hinaus des Spülprogramm mit einer Vorspülphase, in der in der Regel kein Aufheizen der Spülflüssigkeit erfolgt, so kann dieses Verfahren nicht angewendet werden.This flushing method has the disadvantage that the Filling the dishwasher in the first wash is fixed regardless of the current load and the cleaning of the wash items adapted to the load only starts after the first rinse. Starts about it addition to the wash program with a pre-wash phase in which usually there is no heating of the rinsing liquid, so this procedure cannot be used.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren gemäß dem Oberbegriff des Anspruches 1 und eine Geschirrspülmaschine gemäß dem Oberbegriff des Anspruches 11 so weiter zu bilden, daß eine Reinigung eines eingebrachten Spülgutes mit besonders gut an diese Beladung angepaßtem Wasser- und Energieverbrauch in jeder Phase des ablaufenden Spülprogrammes ermöglicht ist.The invention has for its object a method according to the preamble of claim 1 and one Dishwasher according to the preamble of the claim 11 so that a cleaning of a brought washware with particularly good to this load adapted water and energy consumption in every phase of the running washing program is enabled.

Die Lösung dieser Aufgabe erfolgt gemäß der Erfindung bei einem solchen Verfahren durch die kennzeichnenden Merkmale des Anspruchs 1 und bei einer solchen Geschirrspülmaschine durch die kennzeichnenden Merkmale des Anspruchs 11.This object is achieved according to the invention such a process by the characteristic features of claim 1 and in such a dishwasher by the characterizing features of claim 11.

Bei einer Verfahrensweise gemäß der Erfindung wird die in den Spülbehälter eingebrachte Geschirrmenge selbsttätig erkannt, wozu festgestellt wird, welche Wassermenge notwendig ist, um die Oberfläche des eingebrachten Geschirrs betriebsgemäß zu benetzen. Je mehr Wasser für diese Benetzung gebraucht wird, umso mehr Geschirroberfläche und ggf. Geschirrmasse ist im Regelfall vorhanden. Abhängig von der zu reinigenden Oberfläche des Geschirrs ist auch die Zeit, die Wassermenge und die Spülmittelmenge, die im Spülprozeß für eine ordentliche Reinigung zur Verfügung stehen muß. Abhängig von der Benetzungswassermenge wird ein Benetzungswert generiert, und dementsprechend bei festgestellter minderer Beladung das Grundspülprogramm abgeändert, in dem verkürzte Spülgänge, das Überführen eines Spülgangs in den anderen Spülgang vor Ablauf der für den ersten Spülgang vorgesehenen maximalen Dauer, durch Ausblenden von Teilentleerungs- und Nachfüllgängen im Reinigungsgang, durch Auslassen des oder eines Zwischenspülgangs, durch Verminderung der Pumpendrehzahl und damit des Sprühdrucks, durch Verminderung der Zugabemenge von Reinigungsmittel und/oder Klarspülmittel und dgl. ausgeführt werden.In a procedure according to the invention, the in the amount of dishes placed in the washing compartment automatically recognized what is determined for what amount of water is necessary to the surface of the introduced To wet dishes according to operational requirements. The more water for this wetting is needed, even more so The surface of the dishes and, if applicable, the mass of crockery is usually available. Depending on the surface to be cleaned Dishes are also the time, the amount of water and the Amount of detergent in the washing process for a decent Cleaning must be available. Depends on the Wetting water quantity a wetting value is generated, and accordingly if a lower load is found changed the basic washing program in the shortened Rinses, the transfer of one rinse into the other Rinse cycle before the end of the first rinse cycle intended maximum duration, by hiding Partial emptying and refilling in the cleaning cycle, by skipping the or an intermediate rinse, by Reduction of the pump speed and thus the spray pressure, by reducing the amount of detergent added and / or rinse aid and the like.

Zur Ermittlung des beladungsabhängigen Benetzungswertes ist es zweckmäßig, nach dem Start des Grundspülprogramms bei laufender Umwälzpumpe im Vorspülgang die Menge des bis zu einem jeweils vorbestimmten dynamischen Füllniveau eingelaufenen Zulaufwassers zu messen. Der beladungsabhängige Benetzungswert entspricht dabei der Differenz aus dieser Zulaufwassermenge und einem Defaultwert, der sich aus der Füllmenge bei fehlender Beladung des Geschirrspülraumes ergibt. In gleicher Weise läßt sich auch der Beladungszustand im Reinigungsspülgang ermitteln. Dabei ist es aber auch möglich, den beladungsabhängigen Benetzungswert aus der Differenz des Mengenmeßwerts des Vorspülganges und des Mengenmeßwerts des Reinigungsspülganges zu ermitteln, wodurch berücksichtigt wird, daß beispielsweise eine mit der Öffnung nach oben gerichtete Tasse vorhanden ist, die eine Wassermenge zurückhält, welche für den Spülprozeß im Vorspülgang verloren ist, im Reinigungsspülgang jedoch zu keiner Verfälschung der Gesamtfüllmenge führt. Bei einer solchen ungewollten Verfälschung des Meßergebnisses kann es zweckmäßig sein, eine zusätzliche Information über die Geschirrmasse zü generieren, in dem in einem beheizten Spülgang bei eingeschalteter Spülbehälterheizung der Gradientenwert des Temperaturanstiegs der Spülflüssigkeit bestimmt wird. Je größer die Geschirrmasse ist, umso kleiner wird der Gradientenwert. Der Gradientenwert stellt somit ein Maß für die vorhandene Geschirrmasse dar, nachdem die Spülbehälterheizung eine konstante Leistung aufweist. Da sowohl der Benetzungswert bzw. die Benetzungswerte und der Temperaturgradientenwert aber nur unscharfe Größen darstellen, werden diese Werte vorzugsweise einer Fuzzy-Steuerung zugeführt, die anhand von in Tabellen abgespeicherten Fuzzy-Kennlinien den Grad der Beladung näherungsweise feststellen. Dabei werden zu einem abnehmenden Benetzungswert und/oder zu höheren Temperaturgradientenwerten hin Teilspülgänge aus dem Geschirrspülprogramm weggelassen oder ineinander bei verkürzter Programmdauer überführt. Zusätzlich oder alternativ kann aber auch zu einem abnehmenden Benetzungswert und/oder zu höheren Temperaturgradientenwerten hin eine Verminderung der Pumpenleistung bzw. des Sprühdrucks erfolgen, mit welchem Spülflüssigkeit auf das zu spülende Gut gefördert wird. Unter den gleichen Bedingungen kann jedoch auch die Aufheizgeschwindigkeit der Spülflüssigkeit verändert oder deren Endtemperatur vermindert werden bzw. die Menge eines dem Spülwasser zuzugebenden Reinigungs- oder Klarspülmittels der Menge zu reinigenden Geschirrs angepaßt werden. Ist die Abweichung der beladungsabhängigen Werte gegenüber den Werten einer z.B. nach Normvorschriften beladenen Geschirrspülmaschine relativ gering, dann ist es zweckmäßig, jedenfalls im Klarspülgang die Antriebsdrehzahl der Umwälzpumpe und die Aufheizendtemperatur gegenüber dem im Grundspülprogramm vorgegebenen Drehzahl- und Temperaturendwert zu vermindern. Mit zunehmender Änderung dieser Werte kann zusätzlich der Teilentleerungs- und Nachfüllgang aus dem Grundspülprogramm ausgeblendet und im Bedarfsfall auch zusätzlich noch in dem oder wenigstens einem Zwischenspülgang die Pumpendrehzahl reduziert werden.To determine the load-dependent wetting value it is useful to start after the basic wash program running circulation pump in the pre-rinse cycle the amount of up to a respectively predetermined dynamic fill level to measure incoming inflow water. The load-dependent wetting value corresponds to the Difference from this inflow water quantity and one Default value, which results from the filling quantity if there is no Loading the dishwashing room results. In the same way you can also check the load in the cleaning rinse determine. But it is also possible to load-dependent wetting value from the difference of the Quantity measurement of the pre-rinse cycle and the quantity measurement of the To determine cleaning rinse, which takes into account is that for example one with the opening facing up directed cup is present, which is a quantity of water holds back which for the rinsing process in the pre-rinse cycle is lost, but none in the cleaning rinse cycle Falsification of the total filling quantity leads. With one There may be unwanted falsification of the measurement result be useful additional information about the Generate crockery mass in a heated Rinse cycle when the rinse tank heater is switched on Gradient value of the temperature rise of the rinsing liquid is determined. The larger the mass of dishes, the more the gradient value becomes smaller. The gradient value represents thus represents a measure of the existing tableware mass after the rinse tank heater has a constant output. Since both the wetting value or the wetting values and the temperature gradient value, however, only fuzzy quantities represent, these values are preferably a fuzzy control fed, based on in tables stored fuzzy characteristics the degree of loading approximate. Thereby become one decreasing wetting value and / or to higher Temperature gradient values towards partial rinse cycles from the Dishwashing program omitted or intertwined reduced program duration transferred. In addition or alternatively it can also lead to a decreasing wetting value and / or towards higher temperature gradient values a reduction in pump performance or spray pressure with which rinsing liquid to wash on Is well promoted. Under the same conditions can but also the rate of heating of the rinsing liquid changed or their final temperature reduced or the amount of a cleaning agent to be added to the rinse water or rinse aid of the amount of dishes to be cleaned be adjusted. Is the deviation of the load-dependent Values versus the values of e.g. according to standard regulations loaded dishwasher relatively low, then it is expedient, at least in the rinse aid, the drive speed of the circulation pump and the final heating temperature compared to speed and speed specified in the basic wash program Reduce the final temperature. With increasing change these values can also be the partial emptying and Refill cycle hidden from the basic washing program and in the If necessary, additionally in or at least an intermediate rinse the pump speed can be reduced.

Eine Geschirrspülmaschine zur Durchführung eines beladungsabhängig zu ändernden Spülprogramms weist in einem mit zu reinigendem Geschirr zu beschickenden Spülbehälter drehbar gelagerte Sprüharme auf, welche von einer aus der Ablaufwanne des Spülbehälters gespeisten Umwälzpumpe mit Spülflüssigkeit beschickt werden. Zur Steuerung des notwendigen Frischwasserzulaufs sind Magnetventile vorgesehen, die wie die Umwälzpumpe programmgemäß gesteuert werden. Dabei werden der oder die jeweils aus den über Drucksensoren festgestellten Wasserzulaufmengen ermittelten Differenzwerte und/oder der tatsächliche Temperaturgradientenwert bei der Aufheizung der Spülflüssigkeit unter Anwendung von Fuzzy-Regeln und festgestellten tabellierten MembershipFunktionen fuzzyfiziert derart, daß beladungsabhängige Steuersignale generiert werden, welche der Programmsteuerung zur Abänderung des Grundspülprogramms zugeführt werden. Zur Ermittlung der Wasserzulaufmenge dient vorzugsweise ein digitaler Druckwächter, dessen Steuersignale in einer digitalen Steuerung unmittelbar weiterverarbeitet werden können. Der Druckwächter gibt dann ein Steuersignal zum Unterbrechen des eingeleiteten Wasserzuflusses an die Programmsteuerung ab, wenn das Spülniveau im Spülbehälter zur Wassereinsparung eine Höhe erreicht hat, bei welcher der laufenden Umwälzpumpe gerade die Zulaufwassermenge in der Ablaufwanne zur Verfügung steht, die für ihren ordnungsgemäßen Betrieb bei ggf. verminderter Beladung erforderlich ist. Hierzu kann ein Drucksensor zur Anwendung gelangen, der ein vorgegebenes Niveau in der Ablaufwanne steuert. Der Drucksensor kann jedoch auch von der Umwälzpumpe erzeugten Druck messen und die Unterbrechung des Zulaufventils dann steuern, wenn die Schwankungsamplitude des Pumpendruckes einen bestimmten Wert unterschritten hat, bei dem davon auszugehen ist, daß keine Luft angesaugt wird. Mit dem jeweiligen Drucksensor kann dabei dann, wenn während des Programmablaufs die für den ordnungsgemäßen Betrieb der Umwälzpumpe erforderliche Spülflüssigkeitsmenge nicht oder nicht mehr vorhanden ist, ein erneuter Wasserzulauf bis zum Erreichen des betriebsgerechten Niveaus gesteuert werden. Zur Ermittlung der Wasserzulaufmenge ist es zweckmäßig, bei bekannter zeitlicher Durchflußmenge des betreffenden Zulaufventils die Einschaltdauer zu messen und als Steuerwert für die Zulaufmenge zu nutzen. Zur Einflußnahme auf die Pumpendrehzahl in Abhängigkeit vom Beladungszustand wird deren Pumpendrehzahl zweckmäßigerweise mittels eines Tachometers erfaßt und dessen Ausgangssignal einer Drehzahlsteuerelektronik zugeführt, die zusätzlich von einem beladungsabhängigen Drehzahlsteuersignal beaufschlagt wird. Dabei ist es zweckmäßig, die einmal während eines Programmablaufs festgestellte Notwendigkeit der Drehzahlverminderung zu speichern und in den nachfolgenden Spülprogrammschritten des laufenden Spülprogramms beizubehlaten. Bei verminderter Drehzahl der Umwälzpumpe ist dann auch nur eine verminderte Zulaufwassermenge erforderlich, so daß zumindest Betriebsenergie für die Umwälzpumpe durch die verminderte Pumpenleistung als auch ein geringerer Wasserbedarf erreicht werden. Die Energieeinsparung wird auch dann noch verbessert, wenn bei verminderter Beladungsmenge die Temperatur im Klarspülgang beispielsweise von 70 Grad Celsius auf 65 Grad Celsius abgesenkt wird.A dishwasher to carry out a load dependent the wash program to be changed assigns in one cleaning dishes can be rotated to the loading rinsing container stored spray arms, which from one of the drain pan of the circulating pump fed with circulating liquid be loaded. To control the necessary Fresh water inlet solenoid valves are provided that like the circulation pump can be controlled according to the program. there be the one or the each from the pressure sensors determined water supply quantities determined differential values and / or the actual temperature gradient value when heating the rinsing liquid using Fuzzy rules and identified membership functions fuzzy in such a way that load-dependent Control signals are generated which the program control to change the basic wash program become. It is preferably used to determine the water inflow quantity a digital pressure switch, whose control signals in immediately processed by a digital controller can be. The pressure switch then gives a control signal to interrupt the inflow of water to the Program control from when the rinse level in the rinse tank for water saving has reached a height at which of the running circulating pump just the amount of feed water in the drain pan is available for your proper operation with possibly reduced loading is required. A pressure sensor can be used for this get to a predetermined level in the drain pan controls. However, the pressure sensor can also be used by the Circulating pump measure pressure generated and the interruption of the feed valve then control when the fluctuation amplitude of the pump pressure a certain value has fallen below, where it can be assumed that none Air is sucked in. With the respective pressure sensor can in this case if during the program run the for correct operation of the circulation pump is required Amount of rinsing liquid is missing or no longer available, a renewed water supply until the operational level is reached Levels can be controlled. To determine the It is advisable to add water, if known temporal flow rate of the relevant inlet valve to measure the duty cycle and as a control value for the To use feed quantity. To influence the pump speed depending on the loading condition Pump speed expediently by means of a tachometer detects and its output signal of a speed control electronics fed by an additional load-dependent Speed control signal is applied. there it is useful to do this once during a program run determined need to reduce the speed save and in the subsequent washing program steps of the current washing program. With diminished The speed of the circulation pump is then only a reduced one Inlet water required, so that at least Operating energy for the circulation pump due to the reduced Pump performance as well as a lower water requirement can be achieved. The energy saving will still be there Improved if the Rinse aid temperature of 70 degrees, for example Celsius is lowered to 65 degrees Celsius.

Der bereits erwähnte Defaultwert kann nicht nur ein empirisch ermittelter Festwert oder der Zulaufmenge entsprechen, die bei laufender Umwälzpumpe ohne Geschirr-beladung erforderlich ist, er kann auch der Zulaufwassermenge entsprechen, die im letzten wasserbeschickten Spülgang des vorangegangenen abgeschlossenen Spülprogramms ermittelt worden ist, nachdem dort vor dem Wasserzulauf das Geschirr jedenfalls benetzt war.The default value already mentioned cannot only be a empirically determined fixed value or the inflow quantity correspond to those with the circulation pump running and without loading dishes is necessary, it can also increase the amount of feed water correspond to the last water-fed Rinse cycle of the previous completed wash program has been determined after there before the water supply Crockery was wet anyway.

Insgesamt werden mit der beladungsabhängigen Steuerung, die vorzugsweise nach Fuzzy-Regeln gesteuert ist, besonders bei Teilbeladung die Verbrauchswerte niedrig gehalten und selbst bei der Normbeladung auf einem Minimum gehalten. Dabei ist es bei Teilbeladung unerheblich, wo das Geschirr im Spülbehälter angeordnet ist.Overall, with the load-dependent control, the is preferably controlled according to fuzzy rules, especially with Partial load kept the consumption values low and kept to a minimum even with standard loading. It is irrelevant where the dishes are with partial loads is arranged in the washing container.

Zwar wird eine starke Verschmutzung auf dem Geschirr zusätzlich Wasser zum Benetzen aufnehmen und so eine größere Oberfläche vortäuschen. Dies stört aber nicht, da damit eine Information über den Verschmutzungsgrad gegeben ist und ein hoher Verschmutzungsgrad auch eine stärkere Reinigungskraft fordert.There is a lot of dirt on the dishes also take up water to wet and so one fake larger surface. But this doesn't bother you thus information about the degree of pollution is given is and a high degree of pollution also a stronger one Cleaner demands.

Dem zu verändernden Grundspülprogramm liegt als Basis der Reinigungsbedingungen eine festgelegte Beladung zu Grunde, gegenüber welcher bei Beladungsänderungen zweckmäßige Änderungen des Spülprogrammablaufs vorgenommen werden.The basic wash program to be changed is the basis of the Cleaning conditions based on a specified load, compared to which is useful for load changes Changes to the wash program sequence can be made.

Claims (17)

  1. Method of operating a dishwasher with a basic wash program adapted to fixed cleaning conditions, in which consecutively at least one pre-wash cycle, a heated cleaning cycle, optionally with a partial emptying and refilling cycle, at least one intermediate wash cycle, and a final rinse cycle take place and in the wash cycles a controlled water supply into a wash container is carried out and a circulation pump is operated, wherein after wash cycles, pumping out of washing fluid takes place, characterised in that a load-dependent wetting value corresponding to the quantity of water necessary to wet the incorporated items to be washed is determined and in that the basic wash program is changed depending on the current wetting value in the case of a reduced load compared to a fixed load.
  2. Method according to claim 1, characterised in that after the start of the basic wash program with the circulation pump running, in the pre-wash cycle and/or in the cleaning wash cycle, the quantity of supply water which has flowed in up to a respectively predetermined dynamic filling level is measured, and the load-dependent wetting value corresponds to the differential either of the respective quantity measured value and a default value, which arises from the supply water quantity without load, or of the quantity measured value of the pre-wash cycle and of the quantity measured value of the cleaning cycle.
  3. Method according to claim 1 or 2, characterised in that in the pre-wash and/or in the cleaning cycle, with the wash container heating switched on, the gradient value of the temperature rise of the washing fluid is determined.
  4. Method according to claim 1 or one of the subsequent claims, characterised in that at a decreasing wetting value and/or towards higher temperature gradient values, partial wash cycles are omitted from the total wash program or are merged together.
  5. Method according to claim 1 or one of the subsequent claims, characterised in that at a decreasing wetting value and/or towards higher temperature gradient values, there is a reduction in the spray pressure at which washing fluid is conveyed on to the items to be sprayed.
  6. Method according to claim 1 or one of the subsequent claims, characterised in that at a decreasing wetting value and/or towards higher temperature gradient values, the heating rate of the washing fluid is changed.
  7. Method according to claim 1 or one of the subsequent claims, characterised in that at a decreasing wetting value and/or towards higher temperature gradient values, the quantity of a cleaning and/or rinsing agent to be added to the washing water is changed.
  8. Method according to claim 1 or one of the subsequent claims, characterised in that values to be decreased of at least one differential value and/or towards higher temperature gradient values at least in the final rinse cycle the final drive speed of the circulation pump and the heating temperature is decreased relative to the speed and temperature final value predetermined in the basic wash program.
  9. Method according to claim 1 or one of the subsequent claims, characterised in that with an increasing change of one or both differential values and/or of the temperature gradient value, in addition the partial emptying and re-filling cycle is blanked out of the basic wash program.
  10. Method according to claim 1 or one of the subsequent claims, characterised in that as at least one of the differential values approaches a respectively predetermined lower value and/or the temperature gradient value towards an upper limit value, which is preferably determined by the temperature gradient value in the unloaded state of the appliance, additionally in the or at least one intermediate wash cycle, the pump speed is reduced.
  11. Dishwasher comprising a wash container to be loaded with items to be washed, comprising a circulation pump for circulating a washing fluid, a water supply control for the supply of a quantity of water, and at least one pressure sensor for establishing the respective water supply quantity, characterised in that means are provided whereby a differential value derived from a supply water quantity fixed via the pressure sensor, of which there is at least one, and a default value is determined, in that the differential value, with the application of fuzzy rules and fixed, tabulated membership functions is fuzzified, in such a manner that load-dependent control signals are generated, which are fed to a program control for varying a basic wash program.
  12. Dishwasher according to claim 11, characterised in that in order to determine the supply water quantity, a digital pressure monitor is provided, which controls the water supply up to a level at which the operating circulation pump just ceases to take in any more air.
  13. Dishwasher according to claim 12, characterised in that by the pressure monitor, the starting pressure of the circulation pump is detectable and the water supply can be interrupted if the pressure fluctuations are below a predetermined amplitude.
  14. Dishwasher according to claim 11 or one of the subsequent claims, characterised in that the water supply-dependent values are derivable from the duration of the water supply.
  15. Dishwasher according to claim 11 or one of the subsequent claims, characterised in that the circulation pump speed is detectable by means of a tachometer and its output signal is capable of being fed to an electronic speed control, which is additionally capable of being acted on by a load-dependent speed control signal.
  16. Dishwasher according to claim 11 or one of the subsequent claims, characterised in that a temperature gradient value is fuzzifiable.
  17. Dishwasher according to claim 11 or one of the subsequent claims, characterised in that the default value is an empirically determinable fixed value or corresponds to the supply water quantity which is necessary with the pump operating without items loaded, or to the supply water quantity which has been detected in the water-filled wash cycle of the previous wash program which has taken place.
EP96100441A 1995-02-18 1996-01-13 Method for operating a dishwasher and dishwasher Expired - Lifetime EP0727179B1 (en)

Applications Claiming Priority (2)

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DE19505552 1995-02-18
DE19505552A DE19505552A1 (en) 1995-02-18 1995-02-18 Method for operating a dishwasher

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EP0727179A2 EP0727179A2 (en) 1996-08-21
EP0727179A3 EP0727179A3 (en) 1997-02-05
EP0727179B1 true EP0727179B1 (en) 2001-07-04

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DE102007011307B3 (en) * 2007-03-06 2008-08-21 Miele & Cie. Kg Water intake implementing method for rinsing machine i.e. household-dishwasher, involves supplying water amount to machine depending on refueling rotational speed or mathematical relationship between target and refueling rotational speeds

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DE19538580B4 (en) * 1995-10-17 2008-07-24 Köhler, Katharina Method for operating a dishwasher
DE19651296B4 (en) * 1996-12-10 2016-11-10 BSH Hausgeräte GmbH Dishwasher with a control device
DE19651297B4 (en) * 1996-12-10 2016-11-24 BSH Hausgeräte GmbH Method for operating a dishwasher
DE10008318B4 (en) * 2000-08-10 2008-01-10 AEG Hausgeräte GmbH A water-conducting domestic appliance with an emptying system and method for filling and monitoring an emptying of a working container
DE10048088A1 (en) * 2000-09-28 2002-04-11 Miele & Cie Method for recognizing the loading of a program-controlled dishwasher with dishes and a dishwasher for carrying out the method
DE10048085A1 (en) * 2000-09-28 2002-04-18 Miele & Cie Method for recognizing the loading of a program-controlled dishwasher with dishes and a dishwasher for carrying out the method
DE10255380A1 (en) 2002-11-27 2004-06-09 BSH Bosch und Siemens Hausgeräte GmbH System for recognizing the amount of dishes in the dishwasher rinsing container and dishwasher
DE102004056052A1 (en) * 2004-11-19 2006-06-01 Meiko Maschinenbau Gmbh & Co. Kg Method for assessing and ensuring thermal hygiene effect
DE102007059517A1 (en) * 2007-12-11 2009-06-18 BSH Bosch und Siemens Hausgeräte GmbH Method for detecting a load-related heat capacity change of a water-conducting household appliance
TR200806744A2 (en) * 2008-09-05 2010-03-22 Vestel Beyaz E�Ya Sanay� Ve T�Caret Anon�M ��Rket�@ Load detection method for dishwashers
TR200807861A2 (en) * 2008-10-20 2010-05-21 Vestel Beyaz Eşya Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇@ Detergent chamber opening method
US10335012B2 (en) 2015-10-19 2019-07-02 Electrolux Home Products, Inc. Dishwasher spray fill

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JPH0260624A (en) * 1988-08-29 1990-03-01 Matsushita Seiko Co Ltd Dish drier

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Publication number Priority date Publication date Assignee Title
DE102007011307B3 (en) * 2007-03-06 2008-08-21 Miele & Cie. Kg Water intake implementing method for rinsing machine i.e. household-dishwasher, involves supplying water amount to machine depending on refueling rotational speed or mathematical relationship between target and refueling rotational speeds
EP1967121A1 (en) 2007-03-06 2008-09-10 Miele & Cie. KG Method for causing water to flow into the detergent holder of a dishwasher

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DE19505552A1 (en) 1996-08-22
EP0727179A3 (en) 1997-02-05
EP0727179A2 (en) 1996-08-21
DE59607189D1 (en) 2001-08-09

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