EP0727179A2 - Method for operating a dishwasher - Google Patents

Method for operating a dishwasher Download PDF

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Publication number
EP0727179A2
EP0727179A2 EP96100441A EP96100441A EP0727179A2 EP 0727179 A2 EP0727179 A2 EP 0727179A2 EP 96100441 A EP96100441 A EP 96100441A EP 96100441 A EP96100441 A EP 96100441A EP 0727179 A2 EP0727179 A2 EP 0727179A2
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EP
European Patent Office
Prior art keywords
value
water
rinse
program
temperature gradient
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96100441A
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German (de)
French (fr)
Other versions
EP0727179A3 (en
EP0727179B1 (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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Application filed by AEG Hausgeraete GmbH filed Critical AEG Hausgeraete GmbH
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Publication of EP0727179A3 publication Critical patent/EP0727179A3/en
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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 the first claim.
  • a basic washing program is specified that is tailored to the maximum cleaning conditions of the dishes to be washed.
  • a 1/2 button is provided, by means of which a partial load is taken into account, the dishes to be cleaned then being washed, for example, only in the upper basket. Pressing this 1/2 button leads to faulty washing processes if a full machine is washed with the button pressed or if the machine is only moderately loaded when the button is not pressed, but still processes the full basic washing program.
  • the invention has for its object to develop a method according to the preamble of the first claim so that manual intervention in the washing program is unnecessary.
  • the amount of dishes placed in the washing container becomes automatic recognized, for which purpose it is determined what amount of water is necessary in order to wet the surface of the dishes brought into operation. The more water is used for this wetting, the more tableware surface and, if necessary, the amount of crockery is usually available. Depending on the surface of the dishes to be cleaned, there is also the time, the amount of water and the amount of detergent that must be available for proper cleaning in the washing process.
  • a wetting value is generated and, if a lower load is found, the basic wash program is changed accordingly, in the shortened wash cycles, the transfer of one wash cycle into the other wash cycle before the maximum duration provided for the first wash cycle has elapsed, by hiding partial emptying and refilling cycles in the cleaning cycle, by omitting the or an intermediate rinsing cycle, by reducing the pump speed and thus the spray pressure, by reducing the amount of detergent and / or rinse aid and the like.
  • the load-dependent wetting value corresponds to the difference between this supply water quantity and a default value which results from the filling quantity when the dishwasher compartment is not loaded.
  • the loading condition in the cleaning rinse cycle can also be determined in the same way.
  • the loading-dependent wetting value from the difference between the measured quantity of the pre-rinse cycle and the measured quantity of the cleaning rinse cycle, thereby taking into account that, for example, one with the opening facing upward directed cup is present, which holds back an amount of water which is lost for the rinsing process in the pre-rinse cycle, but does not lead to a falsification of the total filling amount in the cleaning rinse cycle.
  • the gradient value thus represents a measure of the existing crockery mass after the washing container heater has a constant output.
  • both the wetting value or the wetting values and the temperature gradient value only represent fuzzy values, these values are preferably fed to a fuzzy controller, which approximately determine the degree of loading on the basis of fuzzy characteristic curves stored in tables.
  • a fuzzy controller which approximately determine the degree of loading on the basis of fuzzy characteristic curves stored in tables.
  • partial wash cycles are omitted from the dishwashing program or are converted into one another with a shortened program duration.
  • a decrease in the wetting value and / or to higher temperature gradient values can also result in a reduction in the pump output or the spray pressure with which rinsing liquid is conveyed onto the items to be rinsed.
  • the heating rate of the washing liquid can also be changed or its final temperature reduced or the amount of a detergent or rinse aid to be added to the washing water can be adapted to the amount of dishes to be cleaned. If the deviation of the load-dependent values from the values of a dishwasher loaded according to standard regulations, for example, is relatively small, then it is It is advisable to reduce the drive speed of the circulating pump and the final heating temperature in the final rinse cycle compared to the final speed and temperature values specified in the basic rinse program. As these values change, the partial emptying and refilling cycle can also be hidden from the basic washing program and, if necessary, the pump speed can also be reduced in one or at least one intermediate rinsing cycle.
  • a dishwasher for carrying out a washing program to be changed as a function of the load has rotatably mounted spray arms in a washing container to be cleaned with dishes, which are fed with washing liquid by a circulation pump fed from the drain pan of the washing container.
  • solenoid valves are provided which, like the circulation pump, are controlled according to the program.
  • the difference value (s) determined from the water supply quantities determined via pressure sensors and / or the actual temperature gradient value during the heating of the rinsing liquid are fuzzyfied using fuzzy rules and determined tabulated membership functions in such a way that load-dependent control signals are generated which are used by the program control for Modification of the basic washing program can be supplied.
  • a digital pressure switch the control signals of which can be directly processed further in a digital controller, is preferably used to determine the water supply quantity.
  • the pressure switch then sends a control signal to interrupt the initiated water flow to the program control when the rinsing level in the rinsing tank for water saving has reached a level at which the running circulation pump has just the amount of supply water available in the drain pan which is necessary for its proper operation if necessary reduced load is required.
  • a pressure sensor can be used which controls a predetermined level in the drain pan.
  • the pressure sensor can also measure the pressure generated by the circulation pump and then control the interruption of the feed valve when the fluctuation amplitude of the pump pressure has fallen below a certain value, at which it can be assumed that no air is sucked in.
  • a new water supply can be controlled until the operational level is reached when the flushing liquid quantity required for the correct operation of the circulation pump is not or no longer available during the program run.
  • To determine the water supply quantity it is expedient to measure the switch-on time when the flow rate of the supply valve in question is known and to use it as a control value for the supply quantity.
  • its pump speed is expediently recorded by means of a tachometer and its output signal is fed to speed control electronics which are additionally acted upon by a speed control signal which is dependent on the environment. It is expedient to save the need to reduce the speed once determined during a program run and to add it to the current washing program in the subsequent washing program steps.
  • the speed of the circulation pump is reduced, then only a reduced amount of feed water is required, so that at least operating energy for the circulation pump is achieved due to the reduced pump output and a lower water requirement.
  • the energy saving is also improved if the temperature in the rinse aid, for example, is reduced from 70 degrees Celsius to 65 degrees Celsius with a reduced load.
  • the already mentioned default value can not only correspond to an empirically determined fixed value or the inflow amount that is required when the circulating pump is running without loading dishes, it can also correspond to the inflow water amount that was determined in the last water-loaded rinse cycle of the previous completed rinsing program after there before the water supply the dishes were wetted anyway.
  • the consumption values are kept low, especially for partial loads, and are kept to a minimum even with the standard load. In the case of partial loads, it is irrelevant where the dishes are arranged in the washing container.
  • the basic wash program to be changed is based on a defined load as the basis for the cleaning conditions, against which expedient changes to the wash program sequence are made when the load changes.

Abstract

The basic control program is matched to particular conditions of washing and begins with a preliminary rinse, followed by a hot cleansing rinse with opt. partial emptying and refilling, one or more intermediate rinses and a pure-water rinse. Water supply to the rinsing liq. container is controlled and the liq. is pumped out after the rinses. A load-dependent wetting value corresp. to the water requirement is worked out, and the program is varied for lighter loads in accordance with the actual wetting value.

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Geschirrspülmaschine gemäß dem Oberbegriff des ersten Anspruchs.The invention relates to a method for operating a dishwasher according to the preamble of the first claim.

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 is specified that is tailored to the maximum cleaning conditions of the dishes to be washed. In order to adapt to a reduced load, a 1/2 button is provided, by means of which a partial load is taken into account, the dishes to be cleaned then being washed, for example, only in the upper basket. Pressing this 1/2 button leads to faulty washing processes if a full machine is washed with the button pressed or if the machine is only moderately loaded when the button is not pressed, but still processes the full basic washing program.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren gemäß dem Oberbegriff des ersten Anspruchs so weiter zu bilden, daß sich manuelle Eingriffe in das Spülprogramm erübrigen.The invention has for its object to develop a method according to the preamble of the first claim so that manual intervention in the washing program is unnecessary.

Die Lösung dieser Aufgabe erfolgt gemäß der Erfindung durch die kennzeichnenden Merkmale des ersten Anspruchs.This object is achieved according to the invention by the characterizing features of the first claim.

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 amount of dishes placed in the washing container becomes automatic recognized, for which purpose it is determined what amount of water is necessary in order to wet the surface of the dishes brought into operation. The more water is used for this wetting, the more tableware surface and, if necessary, the amount of crockery is usually available. Depending on the surface of the dishes to be cleaned, there is also the time, the amount of water and the amount of detergent that must be available for proper cleaning in the washing process. Depending on the amount of wetting water, a wetting value is generated and, if a lower load is found, the basic wash program is changed accordingly, in the shortened wash cycles, the transfer of one wash cycle into the other wash cycle before the maximum duration provided for the first wash cycle has elapsed, by hiding partial emptying and refilling cycles in the cleaning cycle, by omitting the or an intermediate rinsing cycle, by reducing the pump speed and thus the spray pressure, by reducing the amount of detergent 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 zu 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 advisable to measure the amount of inlet water that has run in up to a respectively predetermined dynamic filling level after the start of the basic washing program while the circulation pump is running. The load-dependent wetting value corresponds to the difference between this supply water quantity and a default value which results from the filling quantity when the dishwasher compartment is not loaded. The loading condition in the cleaning rinse cycle can also be determined in the same way. However, it is also possible to determine the loading-dependent wetting value from the difference between the measured quantity of the pre-rinse cycle and the measured quantity of the cleaning rinse cycle, thereby taking into account that, for example, one with the opening facing upward directed cup is present, which holds back an amount of water which is lost for the rinsing process in the pre-rinse cycle, but does not lead to a falsification of the total filling amount in the cleaning rinse cycle. In the event of such an unwanted falsification of the measurement result, it may be expedient to generate additional information about the dish mass in which the gradient value of the temperature rise in the washing liquid is determined in a heated washing cycle with the washing container heating switched on. The larger the crockery mass, the smaller the gradient value. The gradient value thus represents a measure of the existing crockery mass after the washing container heater has a constant output. However, since both the wetting value or the wetting values and the temperature gradient value only represent fuzzy values, these values are preferably fed to a fuzzy controller, which approximately determine the degree of loading on the basis of fuzzy characteristic curves stored in tables. For a decreasing wetting value and / or for higher temperature gradient values, partial wash cycles are omitted from the dishwashing program or are converted into one another with a shortened program duration. Additionally or alternatively, a decrease in the wetting value and / or to higher temperature gradient values can also result in a reduction in the pump output or the spray pressure with which rinsing liquid is conveyed onto the items to be rinsed. Under the same conditions, however, the heating rate of the washing liquid can also be changed or its final temperature reduced or the amount of a detergent or rinse aid to be added to the washing water can be adapted to the amount of dishes to be cleaned. If the deviation of the load-dependent values from the values of a dishwasher loaded according to standard regulations, for example, is relatively small, then it is It is advisable to reduce the drive speed of the circulating pump and the final heating temperature in the final rinse cycle compared to the final speed and temperature values specified in the basic rinse program. As these values change, the partial emptying and refilling cycle can also be hidden from the basic washing program and, if necessary, the pump speed can also be reduced in one or at least one intermediate rinsing cycle.

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 Membership-Funktionen 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 bealdungsabhängigen 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 for carrying out a washing program to be changed as a function of the load has rotatably mounted spray arms in a washing container to be cleaned with dishes, which are fed with washing liquid by a circulation pump fed from the drain pan of the washing container. To control the necessary fresh water supply, solenoid valves are provided which, like the circulation pump, are controlled according to the program. The difference value (s) determined from the water supply quantities determined via pressure sensors and / or the actual temperature gradient value during the heating of the rinsing liquid are fuzzyfied using fuzzy rules and determined tabulated membership functions in such a way that load-dependent control signals are generated which are used by the program control for Modification of the basic washing program can be supplied. A digital pressure switch, the control signals of which can be directly processed further in a digital controller, is preferably used to determine the water supply quantity. The pressure switch then sends a control signal to interrupt the initiated water flow to the program control when the rinsing level in the rinsing tank for water saving has reached a level at which the running circulation pump has just the amount of supply water available in the drain pan which is necessary for its proper operation if necessary reduced load is required. For this purpose, a pressure sensor can be used which controls a predetermined level in the drain pan. However, the pressure sensor can also measure the pressure generated by the circulation pump and then control the interruption of the feed valve when the fluctuation amplitude of the pump pressure has fallen below a certain value, at which it can be assumed that no air is sucked in. With the respective pressure sensor, a new water supply can be controlled until the operational level is reached when the flushing liquid quantity required for the correct operation of the circulation pump is not or no longer available during the program run. To determine the water supply quantity, it is expedient to measure the switch-on time when the flow rate of the supply valve in question is known and to use it as a control value for the supply quantity. In order to influence the pump speed as a function of the loading condition, its pump speed is expediently recorded by means of a tachometer and its output signal is fed to speed control electronics which are additionally acted upon by a speed control signal which is dependent on the environment. It is expedient to save the need to reduce the speed once determined during a program run and to add it to the current washing program in the subsequent washing program steps. If the speed of the circulation pump is reduced, then only a reduced amount of feed water is required, so that at least operating energy for the circulation pump is achieved due to the reduced pump output and a lower water requirement. The energy saving is also improved if the temperature in the rinse aid, for example, is reduced from 70 degrees Celsius to 65 degrees Celsius with a reduced load.

Der bereits erwähnte Defaultwert kann nicht nur ein empirisch ermittelter Festwert oder der Zulaufmenge entsprechen, die bei laufender Umwälzpumpe ohne Geschirrbeladung 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 already mentioned default value can not only correspond to an empirically determined fixed value or the inflow amount that is required when the circulating pump is running without loading dishes, it can also correspond to the inflow water amount that was determined in the last water-loaded rinse cycle of the previous completed rinsing program after there before the water supply the dishes were wetted 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, which is preferably controlled according to fuzzy rules, the consumption values are kept low, especially for partial loads, and are kept to a minimum even with the standard load. In the case of partial loads, it is irrelevant where the dishes are 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.Heavy soiling on the dishes will also absorb water for wetting and thus simulate a larger surface. However, this is not a problem, since it provides information about the degree of soiling and a high degree of soiling also requires a greater cleaning power.

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 based on a defined load as the basis for the cleaning conditions, against which expedient changes to the wash program sequence are made when the load changes.

Claims (16)

Verfahren zum Betreiben einer Geschirrspülmaschine mit einem auf feste Reinigungsbedingungen abgestimmten Grundspülprogramm, in dem aufeinanderfolgend zumindest ein Vorspülgang, ein beheizter Reinigungsspülgang, ggf. mit einem Teilentleerungs-und -nachfüllgang, wenigstens ein Zwischenspülgang sowie ein Klarspülgang abläuft und in den Spülgängen ein gesteuerter Wasserzulauf in einen Spülbehälter durchgeführt und eine Umwälzpumpe betrieben wird, wobei nach Spülgängen ein Abpumpen von Spülflüssigkeit erfolgt, dadurch gekennzeichnet, daß ein beladungsabhängiger Benetzungswert entsprechend der für das Benetzen des eingebrachten Spülguts erforderlichen Wassermenge ermittelt wird und daß abhängig vom aktuellen Benetzungswert bei gegenüber einer festgelegten Beladung verminderter Beladung das Grundspülprogramm abgeändert wird.Method for operating a dishwasher with a basic washing program that is tailored to fixed cleaning conditions, in which at least one pre-wash, a heated cleaning wash, optionally with a partial emptying and refilling cycle, at least one intermediate wash and a final rinse cycle, and a controlled water supply into one in the wash cycles Rinsing tank is carried out and a circulating pump is operated, with rinsing liquid being pumped out after rinsing, characterized in that a load-dependent wetting value is determined in accordance with the amount of water required for wetting the items to be brought in and that, depending on the current wetting value, the load is reduced compared to a fixed load Basic washing program is changed. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß nach dem Start des Grundspülprogramms bei laufender Umwälzpumpe im Vorspülgang und/oder im Reinigungsspülgang die Menge des bis zu einem jeweils vorbestimmten dynamischen Füllniveau eingelaufenen Zulaufwassers gemessen wird, wobei der beladungsabhängige Benetzungswert der Differenz entweder des jeweiligen Mengenmaßwerts und eines Defaultwertes, der sich aus der Zulaufwassermenge bei fehlender Beladung ergibt, oder des Mengenmeßwerts des Vorspülganges und des Mengenmeßwerts des Reingigungsspülganges entspricht.A method according to claim 1, characterized in that after the start of the basic rinsing program with the circulation pump running, the amount of the inlet water which has run in to a respectively predetermined dynamic filling level is measured in the pre-rinse cycle and / or in the cleaning rinse cycle, the loading-dependent wetting value of the difference either of the respective quantity measure and a default value, which results from the supply water quantity in the absence of a load, or the quantity measurement value of the Pre-rinse and the measured quantity of the cleaning rinse corresponds. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß im Vorspül- und/oder im Reinigungsspülgang bei eingeschalteter Spülbehälterheizung der Gradientenwert des Temperaturanstiegs der Spülflüssigkeit bestimmt wird.A method according to claim 1 or 2, characterized in that the gradient value of the temperature rise of the rinsing liquid is determined in the pre-rinse and / or in the cleaning rinse cycle with the rinse tank heating switched on. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß zu einem abnehmenden Benetzungswert und/oder zu höheren Temperaturgradientenwerten hin Teilspülgänge aus dem Gesamtspülprogramm weggelassen oder ineinander übergeführt werden.Method according to Claim 1 or one of the subsequent claims, characterized in that partial wash cycles are omitted from the overall wash program or are converted into one another in the direction of a decreasing wetting value and / or higher temperature gradient values. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß zu einem abnehmenden Benetzungswert und/oder zu höheren Temperaturgradientenwerten hin eine Verminderung des Sprühdrucks, mit welchem Spülflüssigkeit auf das zu sprühende Gut gefördert wird, erfolgt.Method according to Claim 1 or one of the subsequent claims, characterized in that, with a decreasing wetting value and / or with higher temperature gradient values, the spray pressure with which rinsing liquid is conveyed onto the material to be sprayed is reduced. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß zu einem abnehmenden Benetzungswert und/oder zu höheren Temperaturgradientenwerten hin die Aufheizgeschwindigkeit der Spülflüssigkeit verändert wird.Method according to Claim 1 or one of the following, characterized in that the heating-up speed of the rinsing liquid is changed towards a decreasing wetting value and / or towards higher temperature gradient values. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß zu einem abnehmenden Benetzungswert und/oder zu höheren Temperaturgradientenwerten hin die Menge eines dem Spülwasser zuzugebenden Reinigungs- und/oder Klarspülmittels verändert wird.Method according to claim 1 or one of the following, characterized in that the amount of a detergent and / or rinse aid to be added to the rinsing water is changed to a decreasing wetting value and / or to higher temperature gradient values. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß zu abnehmenden Werten wenigstens eines Differenzwertes und/oder zu höheren Temperaturgradientenwerten hin zumindest im Klarspülgang die Antriebsdrehzahl der Umwälzpumpe und die Aufheizendtemperatur gegenüber dem im Grundspülprogramm vorgegebenen Drehzahl- und Temperaturendwert vermindert wird.Method according to Claim 1 or one of the following, characterized in that, in the event of decreasing values of at least one differential value and / or higher temperature gradient values, the drive speed of the circulating pump and the final heating temperature are reduced at least in the final rinse cycle compared to the final speed and temperature value specified in the basic washing program. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß bei zunehmender Änderung eines oder beider Differenzwerte und/oder des Temperaturgradientenwertes zusätzlich der Teilentleerungs- und -nachfüllgang aus dem Grundspülprogramm ausgeblendet wird.Method according to Claim 1 or one of the following, characterized in that, when one or both difference values and / or the temperature gradient value change, the partial emptying and refilling cycle is also hidden from the basic washing program. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß bei Annäherung wenigstens eines der Differenzwerte an einen jeweils vorgegebenen unteren Wert und/oder des Temperaturgradientenwertes zu einem oberen Grenzwert hin, der vorzugsweise durch den Temperaturgradientenwert bei unbeladenem Gerätezustand bestimmt ist, zusätzlich in dem oder wenigstens einem Zwischenspülgang die Pumpendrehzahl reduziert wird.Method according to Claim 1 or one of the following, characterized in that when at least one of the difference 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 when the device is not loaded, additionally in the or at least one intermediate rinse, the pump speed is reduced. Geschirrspülmaschine zur Durchführung des Verfahrens nach Anspruchs 1 oder einem der folgenden, dadurch gekennzeichnet, daß der/die jeweils aus den Wasserzulaufmengen ermittelten Differenzwerte und/oder der tatsächliche Temperaturgradientenwert unter Anwendung von Fuzzy-Regeln und festgelegten tabellierten Membershipfunktionen fuzzifiziert werden, derart, daß beladungsabhängige Steuersignale generiert werden, welche einer Programmsteuerung zur Abänderung des Grundspülprogramms zugeführt werden.Dishwasher for carrying out the method according to claim 1 or one of the following, characterized in that the / the difference values determined from the water inflow quantities and / or the actual temperature gradient value are fuzzified using fuzzy rules and defined tabulated membership functions such that load-dependent control signals are generated, which are fed to a program control for changing the basic washing program. Geschirrspülmaschine nach Anspruch 11, dadurch gekennzeichnet, daß zur Ermittlung der Wasserzulaufmenge ein digitaler Druckwächter dient, der den Wasserzulauf bis zu einem Niveau steuert, bei dem die laufende Umwälzpumpe gerade keine Luft mehr ansaugt.Dishwasher according to claim 11, characterized in that a digital pressure monitor is used to determine the water supply quantity, which controls the water supply to a level at which the running circulation pump is no longer sucking in air. Geschirrspülmaschine nach Anspruch 12, dadurch gekennzeichnet, daß der Druckwächter den Ausgangsdruck der Umwälzpumpe erfaßt und eine Unterbrechung des Wasserzulaufs steuert, wenn die Druckschwankungen eine vorbestimmte Amplitude unterschreiten.Dishwasher according to claim 12, characterized in that the pressure switch detects the outlet pressure of the circulating pump and controls an interruption in the water supply when the pressure fluctuations fall below a predetermined amplitude. Geschirrspülmaschine nach Anspruch 11 oder einem der folgenden, dadurch gekennzeichnet, daß aus der Dauer des Wasserzulaufs die wasserzulaufabhängigen Werte abgeleitet werden.Dishwasher according to claim 11 or one of the following, characterized in that the water supply-dependent values are derived from the duration of the water supply. Geschirrspülmaschine nach Anspruch 11 oder einem der folgenden, dadurch gekennzeichnet, daß die Umwälzpumpendrehzahl mittels eines Tachometers erfaßt und sein Ausgangssignal einer Drehzahlsteuerelektronik zugeführt wird, die zusätzlich von einem beladungsabhängigen Drehzahlsteuersignal beaufschlagt wird.Dishwasher according to claim 11 or one of the following, characterized in that the circulation pump speed is detected by means of a tachometer and its output signal is fed to speed control electronics which are additionally acted upon by a load-dependent speed control signal. Geschirrspülmaschine nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der Defaultwert ein empirisch ermittelter Festwert ist oder der Zulaufwassermenge entspricht, die bei laufender Umwälzpumpe ohne Geschirrbeladung erforderlich ist oder der Zulaufwassermenge entspricht, die im letzten wasserbeschickten Spülgang des abgelaufenen vorangegangenen Spülprogramms ermittelt worden ist.Dishwasher according to claim 1 or one of the following, characterized in that the default value is an empirically determined fixed value or corresponds to the amount of feed water that is required when the circulation pump is running without loading dishes or corresponds to the amount of feed water that was determined in the last water-loaded wash cycle of the previous previous wash program .
EP96100441A 1995-02-18 1996-01-13 Method for operating a dishwasher and dishwasher Expired - Lifetime EP0727179B1 (en)

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EP1192893A2 (en) * 2000-09-28 2002-04-03 Miele & Cie. GmbH & Co. Method for detecting the load in a programmable dishwasher with crockery and dishwasher for carrying out the method
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EP1192893A2 (en) * 2000-09-28 2002-04-03 Miele & Cie. GmbH & Co. Method for detecting the load in a programmable dishwasher with crockery and dishwasher for carrying out the method
EP1192893A3 (en) * 2000-09-28 2003-06-11 Miele & Cie. GmbH & Co. Method for detecting the load in a programmable dishwasher with crockery and dishwasher for carrying out the method
WO2004047608A1 (en) * 2002-11-27 2004-06-10 BSH Bosch und Siemens Hausgeräte GmbH Method for detecting the quantity of dishes in the washing container of a dishwasher and dishwasher for carrying out said method
CN100398053C (en) * 2002-11-27 2008-07-02 Bsh博世和西门子家用器具有限公司 Method for detecting the quantity of dishes in the washing container of a dishwasher and dishwasher for carrying out said method
US8293022B2 (en) 2002-11-27 2012-10-23 Bsh Bosch Und Siemens Hausgeraete Gmbh Method for detecting the quantity of dishes in the washing container of a dishwasher and dishwasher for carrying out said method
WO2006053634A1 (en) * 2004-11-19 2006-05-26 Meiko Maschinenbau Gmbh & Co. Kg Method for evaluation and guaranteeing thermal hygienic effects
WO2009074415A1 (en) * 2007-12-11 2009-06-18 BSH Bosch und Siemens Hausgeräte GmbH Method for detecting a load-related change in thermal capacity of a water-bearing domestic appliance
CN101896111B (en) * 2007-12-11 2013-01-09 Bsh博世和西门子家用器具有限公司 Method for detecting a load-related change in thermal capacity of a water-bearing domestic appliance
EP2160970A3 (en) * 2008-09-05 2011-05-18 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. Weight sensing method for dishwashers
EP2177147A3 (en) * 2008-10-20 2011-10-05 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. Method for opening a detergent chamber
US10335012B2 (en) 2015-10-19 2019-07-02 Electrolux Home Products, Inc. Dishwasher spray fill
US11071436B2 (en) 2015-10-19 2021-07-27 Electrolux Home Products, Inc. Dishwasher spray fill

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EP0727179B1 (en) 2001-07-04

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