EP0862892B1 - Household apparatus with a measuring device for determining the contamination degree of the cleaning liquid - Google Patents

Household apparatus with a measuring device for determining the contamination degree of the cleaning liquid Download PDF

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Publication number
EP0862892B1
EP0862892B1 EP98100429A EP98100429A EP0862892B1 EP 0862892 B1 EP0862892 B1 EP 0862892B1 EP 98100429 A EP98100429 A EP 98100429A EP 98100429 A EP98100429 A EP 98100429A EP 0862892 B1 EP0862892 B1 EP 0862892B1
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EP
European Patent Office
Prior art keywords
measuring device
measurement
program
programme
degree
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EP98100429A
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German (de)
French (fr)
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EP0862892A3 (en
EP0862892A2 (en
Inventor
Rainer Dr. Stamminger
Jürgen Vogel
Wolf-Dieter Krüger
Walter Sams
Michael Feser
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AEG Hausgeraete GmbH
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AEG Hausgeraete GmbH
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4297—Arrangements for detecting or measuring the condition of the washing water, e.g. turbidity

Definitions

  • the invention relates to a household appliance with a Measuring device for determining the degree of contamination a cleaning liquid according to the preamble of Claim 1.
  • Such a household appliance is from DE-A-41 22 988 known.
  • the dishwasher disclosed there the degree of soiling of a washware Flushing liquid through a measuring device in the intake duct a circulation pump. With the help of the determined The degree of soiling becomes the rinsing conditions set accordingly.
  • the measuring device has one Luminous element for emitting light and two opposite arranged light receiving elements for receiving the emitted light, being between the transmitter and the Receivers the rinsing liquid is passed through.
  • the Intensity of the emitted by the lighting element and to the Light receiving elements of excluded light is dependent on the degree of contamination of the rinsing liquid.
  • the transmitting and receiving elements are aging subjected. This means that over the lifetime of the household appliance the sent and received Signals do not remain constant. In particular, this can occur in that transparent cover the Transmitting and receiving devices gradually become cloudy or pollute. This in turn causes incorrect measurements become more critical over time. For this reason is in the known dishwasher at the beginning of Wash program immediately after the first filling step Fresh water made a measurement, so one Set the initial value of the sensor output value. All subsequent measurements during the flushing operation related to this initial value, whereby the influence of the changing during the life of the device Conditions at the measurement location is hidden.
  • the object of the present invention is therefore this Disadvantage of comparing the measuring device with itself conditions that change during the life of the device to avoid at the measuring location.
  • a measured value for the adjustment of the Measuring device in the course of a cleaning program in a previous cleaning program is a home appliance created in which a Mismatch of the measuring device due to an already pre-contaminated liquid is avoided.
  • a household appliance has one Measuring device for determining the degree of contamination a cleaning liquid to use the set the further program sequence to be able to.
  • the Measuring device To influence the changing conditions at the measuring site z. B. due to aging of the broadcast and Reception facilities or a cloudiness possibly included Excluding transparent covers is the Measuring device according to the present conditions on Measurement site before the actual measurement of the Pollution degree can be adjusted.
  • Household appliance is a measurement for the adjustment of the Measuring device for recording the degree of contamination in the course of a cleaning program in one previous cleaning program can be determined. To this Compared to a comparison measurement at the beginning of a Cleaning program avoided by the user introduced highly concentrated contaminants with the first fill with fresh water, which too mismatch. It makes sense to do this Measured value acquisition for the adjustment of the measuring device in a program part of the previous cleaning program, in which unpolluted rinsing liquid Rinsing container is located.
  • the measured value for the calibration of the measuring device is preferably at the end of the previous one Cleaning program, preferably immediately after last filling process with fresh water. To this Way it is ensured that the in a before Filling process from the household appliance is not Removable amount of residual water still available Dirt particles in a particularly low concentration are. After the last filling process during a Cleaning program is the amount of dirt in the Flushing liquid negligible, so practical clear liquid is present.
  • the invention is based on the drawing of a Embodiment explained in more detail.
  • a household dishwasher includes one Rinsing container 1 for arranging items to be washed and three Spray devices, a lower spray arm 3, an upper Spray arm 5 and a ceiling shower 7.
  • the spray devices 3, 5, 7 are from a circulation pump 9 with rinsing liquid fed.
  • the circulation pump 9 sucks out the rinsing liquid the sump 11 of the washing container 1, in which the returning rinsing liquid collects.
  • the circulation pump 9 is connected downstream of a reversing valve 13, which the the rinsing liquid supplied to the circulating pump 9 alternately a riser pipe 15 or a connecting hose 17 supplies.
  • the riser pipe 15 carries the rinsing liquid upper spray arm 5 too.
  • the connecting hose 17 branches itself in a connector 19 to the lower spray arm 3 and in a connecting hose 21, the other with the Ceiling shower 7 is coupled.
  • the supply of fresh water takes place through a water supply hose 25 Flushing liquid is used at the end of the washing program a drain pump 27 removed from the device.
  • the Dishwasher also has a turbidity sensor 23, which is coupled to the connecting hose 21 for Determination of the degree of contamination of the rinsing liquid on.
  • the turbidity sensor 23 is used for an uninfluenced measurement the degree of pollution with the changing conditions compared at the measuring location. This comparison takes place at the beginning of a washing program, with a calibration measurement A in previous washing program is used.
  • the Calibration measurement A is carried out when it is not contaminated Flushing liquid immediately after the fresh water filling process at the beginning of a rinse cycle.
  • the basic sequence of the described two rinse programs being the rinse program X-1 is the name of the program in which the Adjustment measurement A, which is the basis for the adjustment of the Turbidity sensor 23 in the washing program X forms to consider is.
  • Washing program X-1 is at least as a default in the essentially divided into the water-carrying rinse cycles Pre-rinse, clean, rinse and rinse, as well a final drying process.
  • everyone water-carrying rinse starts with a water inlet and is ended with a pumping process of the rinsing liquid.
  • a Add detergent or rinse aid In the rinse and rinse cycles, there is a Add detergent or rinse aid.
  • a calibration measurement A for the turbidity sensor 23 is a measurement of the degree of pollution at the available clear rinsing liquid and the determined signal value for this degree of pollution 0 from an electronic program control, not shown recorded and in a non-volatile memory, a so-called EEPROM, saved.
  • washing program X which is also called Presetting the rinse cycles, rinse, clean, Intermediate rinse and rinse and the final Drying cycle includes, the stored signal value for read the adjustment of the turbidity sensor 23 and the Turbidity sensor 23 calibrated using the adjustment value. All subsequent measurements of the degree of contamination during washing program X are on this in this way Adjustment measured value related.
  • the Water inlet for the pre-rinse cycle and the rinse cycle will started. After about six minutes and after about eight minutes a measurement B, C is carried out and from the two Measured values formed an average. Falls below Average value of the degree of contamination a predetermined Value, the following water change (water change to Program step "cleaning") and the Detergent dosed. So there is a immediate transition from the pre-wash cycle to the Cleaning cycle without changing the rinsing liquid. That remains Average over the predetermined value, the Water changes carried out so that the preset The wash program sequence is not changed at this point.
  • the Degree of pollution determined.
  • two Measurements D, E carried out, this time after about two minutes and after about four minutes. Again, the two become determined measured values formed an average. If the mean falls below a further predetermined value Value, there is no intervention in the Program Sequence. In contrast, the mean remains above that predetermined value, a water change is carried out and a second intermediate rinse in the wash program inserted.

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  • Washing And Drying Of Tableware (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)

Description

Die Erfindung betrifft ein Haushaltsgerät mit einer Meßeinrichtung zur Ermittlung des Verschmutzungsgrades einer Reinigungsflüssigkeit nach dem Oberbegriff des Anspruchs 1.The invention relates to a household appliance with a Measuring device for determining the degree of contamination a cleaning liquid according to the preamble of Claim 1.

Ein derartiges Haushaltsgerät ist aus der DE-A-41 22 988 bekannt. Bei der dort offenbarten Geschirrspülmaschine wird der Verschmutzungsgrad einer ein Spülgut reinigenden Spülflüssigkeit durch eine Meßeinrichtung im Ansaugkanal einer Umwälzpumpe ermittelt. Mit Hilfe des so ermittelten Verschmutzungsgrades werden die Spülbedingungen entsprechend eingestellt. Die Meßeinrichtung weist ein Leuchtelement zum Aussenden von Licht und zwei gegenüber angeordnete Lichtempfangselemente zum Empfangen des ausgesandten Lichts auf, wobei zwischen dem Sender und den Empfängern die Spülflüssigkeit hindurchgeleitet wird. Die Intensität des vom Leuchtelement ausgesandten und an den Lichtempfangselementen ausgenommenen Lichts ist abhängig vom Verschmutzungsgrad der Spülflüssigkeit.Such a household appliance is from DE-A-41 22 988 known. In the dishwasher disclosed there the degree of soiling of a washware Flushing liquid through a measuring device in the intake duct a circulation pump. With the help of the determined The degree of soiling becomes the rinsing conditions set accordingly. The measuring device has one Luminous element for emitting light and two opposite arranged light receiving elements for receiving the emitted light, being between the transmitter and the Receivers the rinsing liquid is passed through. The Intensity of the emitted by the lighting element and to the Light receiving elements of excluded light is dependent on the degree of contamination of the rinsing liquid.

Sende- und Empfangselemente sind jedoch einer Alterung unterworfen. Dies bedeutet, daß im Laufe der Lebensdauer des Haushaltsgerätes die ausgesandten und empfangenen Signale nicht konstant bleiben. Dies kann insbesondere dadurch auftreten, daß transparente Abdeckflächen der Sende- und Empfangseinrichtungen sich allmählich eintrüben oder verschmutzen. Dies wiederum bewirkt Fehlmessungen, die im Laufe der Zeit immer kritischer werden. Aus diesem Grund wird in der bekannten Geschirrspülmaschine zu Beginn des Spülprogramms unmittelbar nach dem ersten Füllschritt mit Frischwasser eine Messung durchgeführt, um so einen Anfangswert des Sensorausgabewertes einzustellen. Alle nachfolgenden Messungen während des Spülbetriebes werden auf diesen Anfangswert bezogen, wodurch der Einfluß der sich während der Lebensdauer des Gerätes ändernden Bedingungen am Meßort ausgeblendet wird.However, the transmitting and receiving elements are aging subjected. This means that over the lifetime of the household appliance the sent and received Signals do not remain constant. In particular, this can occur in that transparent cover the Transmitting and receiving devices gradually become cloudy or pollute. This in turn causes incorrect measurements become more critical over time. For this reason is in the known dishwasher at the beginning of Wash program immediately after the first filling step Fresh water made a measurement, so one Set the initial value of the sensor output value. All subsequent measurements during the flushing operation related to this initial value, whereby the influence of the changing during the life of the device Conditions at the measurement location is hidden.

Diese bekannte Vorgehensweise ist in allen Fällen geeignet, in denen nach dem ersten Füllvorgang im Spülprogramm tatsächlich klare Flüssigkeit am Meßort ansteht. Oftmals werden jedoch in Geschirrspülmaschinen vom Benutzer beim Befüllen mit Spülgut Getränke- und Soßenreste in den Sumpfbereich am Boden der Geschirrspülmaschine eingebracht. Beim ersten Füllvorgang während des Spülbetriebes vermischen sich diese hochkonzentrierten Restflüssigkeiten mit dem zugeführten Frischwasser, so daß diese erste Befüllung noch vor dem Besprühen des Spülgutes bereits eine Grundtrübung aufweist. Dies führt zu einer Fehleinstellung des Anfangswertes des Sensorausgabewertes. Diese Fehleinstellung wird besonder kritisch, wenn die Frischwasser-Füllmenge besonders klein ist, d. h. bei Geschirrspülmaschinen mit besonders niedrigem Wasserverbrauch ist unter den vorgenannten Voraussetzungen die Schmutzkonzentration nach der ersten Befüllung besonders hoch.This known procedure is suitable in all cases in which after the first filling in the washing program there is actually clear liquid at the measuring point. often are in the dishwasher by the user Filling leftovers and sauce residues in the washware Swamp area introduced at the bottom of the dishwasher. During the first filling process during the rinsing operation these highly concentrated residual liquids mix with the fresh water supplied, so that this first Filling even before spraying the dishes Has basic cloudiness. This leads to an incorrect setting the initial value of the sensor output value. This Misalignment becomes particularly critical when the Fresh water filling quantity is particularly small, d. H. at Dishwashers with particularly low Water consumption is under the aforementioned conditions the dirt concentration after the first filling especially high.

Aufgabe der vorliegenden Erfindung ist es deshalb, diesen Nachteil des Abgleiches der Meßeinrichtung mit den sich während der Lebensdauer des Gerätes ändernden Bedingungen am Meßort zu vermeiden. The object of the present invention is therefore this Disadvantage of comparing the measuring device with itself conditions that change during the life of the device to avoid at the measuring location.

Die Lösung dieser Aufgabe erfolgt gemäß der Erfindung durch das kennzeichnende Merkmal des Anspruchs 1.This object is achieved according to the invention by the characterizing feature of claim 1.

Dadurch, daß bei einem Haushaltsgerät mit einer Meßeinrichtung zur Ermittlung des Verschmutzungsgrades einer Reinigungsflüssigkeit, in dem die Meßeinrichtung vor der Messung des Verschmutzungsgrades an sich während der Lebensdauer des Gerätes ändernde Bedingungen am Meßort abgleichbar ist, ein Meßwert für den Abgleich der Meßeinrichtung im Verlauf eines Reinigungsprogrammes in einem vorhergehenden Reinigungsprogramm ermittelbar ist, ist ein Haushaltsgerät geschaffen, in welchem ein Fehlabgleich der Meßeinrichtung aufgrund einer bereits vorverschmutzten Flüssigkeit vermieden ist.The fact that in a household appliance with a Measuring device for determining the degree of contamination a cleaning liquid in which the measuring device in front the measurement of the degree of pollution itself during the Life of the device changing conditions at the measuring location is adjustable, a measured value for the adjustment of the Measuring device in the course of a cleaning program in a previous cleaning program can be determined, is a home appliance created in which a Mismatch of the measuring device due to an already pre-contaminated liquid is avoided.

Ein Haushaltsgerät gemäß der Erfindung weist eine Meßeinrichtung zur Ermittlung des Verschmutzungsgrades einer Reinigungsflüssigkeit auf, um mit Hilfe des ermittelten Wertes den weiteren Programmablauf einstellen zu können. Um einen Einfluß der sich ändernden Bedingungen am Meßort z. B. infolge einer Alterung der Sende- und Empfangseinrichtungen oder einer Eintrübung ggf. umfaßter transparenter Abdeckungen auszuschließen, ist die Meßeinrichtung entsprechend der vorliegenden Bedingungen am Meßort vor der eigentlichen Messung des Verschmutzungsgrades abgleichbar. In dem erfindungsgemäßen Haushaltsgerät ist ein Meßwert für den Abgleich der Meßeinrichtung zur Meßwertaufnahme des Verschmutzungsgrades im Verlauf eines Reinigungsprogrammes in einem vorhergehenden Reinigungsprogramm ermittelbar. Auf diese Weise wird gegenüber einer Abgleichsmessung zu Beginn eines Reinigungsprogrammes vermieden, daß vom Benutzer eingebrachte hochkonzentrierte Verschmutzungen sich mit der ersten Befüllung mit Frischwasser vermischen, welches zu einem Fehlabgleich führt. Sinnvollerweise erfolgt die Meßwerterfassung für den Abgleich der Meßeinrichtung in einem Programmteil des vorhergehenden Reinigungsprogrammes, in welchem sich unverschmutzte Spülflüssigkeit im Spülbehälter befindet.A household appliance according to the invention has one Measuring device for determining the degree of contamination a cleaning liquid to use the set the further program sequence to be able to. To influence the changing conditions at the measuring site z. B. due to aging of the broadcast and Reception facilities or a cloudiness possibly included Excluding transparent covers is the Measuring device according to the present conditions on Measurement site before the actual measurement of the Pollution degree can be adjusted. In the invention Household appliance is a measurement for the adjustment of the Measuring device for recording the degree of contamination in the course of a cleaning program in one previous cleaning program can be determined. To this Compared to a comparison measurement at the beginning of a Cleaning program avoided by the user introduced highly concentrated contaminants with the first fill with fresh water, which too mismatch. It makes sense to do this Measured value acquisition for the adjustment of the measuring device in a program part of the previous cleaning program, in which unpolluted rinsing liquid Rinsing container is located.

Der Meßwert für die Kalibrierung der Meßeinrichtung wird vorzugsweise am Ende des vorhergehenden Reinigungsprogrammes, bevorzugt unmittelbar nach dem letzten Füllvorgang mit Frischwasser, ermittelt. Auf diese Weise ist sichergestellt, daß die in einer vor dem Füllvorgang aus dem Haushaltsgerät nicht abtransportierbaren Restwassermenge noch vorliegenden Schmutzteilchen in einer besonders niedrigen Konzentration sind. Nach dem letzten Füllvorgang während eines Reinigungsprogrammes ist der Schmutzanteil in der Spülflüssigkeit vernachlässigbar, so daß eine praktisch klare Flüssigkeit vorliegt.The measured value for the calibration of the measuring device is preferably at the end of the previous one Cleaning program, preferably immediately after last filling process with fresh water. To this Way it is ensured that the in a before Filling process from the household appliance is not Removable amount of residual water still available Dirt particles in a particularly low concentration are. After the last filling process during a Cleaning program is the amount of dirt in the Flushing liquid negligible, so practical clear liquid is present.

Um den in einem Reinigungsprogramm ermittelten Meßwert für den Abgleich der Meßeinrichtung im nachfolgenden Reinigungsprogramm zur Verfügung zu haben, ist dieser sinnvollerweise in einem nicht-flüchtigen Speicher speicherbar. Somit ist es nicht erforderlich, daß das Haushaltsgerät ununterbrochen an der Versorgungsspannung anliegt, um den Meßwert bis zum nächsten Reinigungsprogramm zu speichern. Sollte ein Meßwert für den Abgleich zu Beginn eines Reinigungsprogrammes nicht abrufbar sein, z. B. infolge einer fehlerhaften Speicherung oder vor dem ersten Reinigungsprogramm überhaupt, so kann ein vordefinierter Wert als Meßwert angenommen werden. Dadurch ist auch bei einem fehlenden Speicherwert eine Messung des Verschmutzungsgrades mit entsprechender Einstellung des weiteren Reinigungsprogrammablaufes möglich. To get the measured value for the adjustment of the measuring device in the following Having the cleaning program available is this logically in a non-volatile memory storable. It is therefore not necessary that the Household appliance continuously on the supply voltage is applied to the measured value until the next cleaning program save. Should be a measured value for the adjustment at the beginning a cleaning program is not available, e.g. B. as a result of incorrect storage or before the first Cleaning program at all, so a predefined Value can be accepted as a measured value. This also means a missing storage value a measurement of the Degree of pollution with appropriate setting of the further cleaning program sequence possible.

Die Erfindung ist im folgenden anhand der Zeichnung eines Ausführungsbeispiels näher erläutert.The invention is based on the drawing of a Embodiment explained in more detail.

Dabei zeigen:

Fig. 1
den Längsschnitt einer Haushalts-Geschirrspülmaschine und
Fig. 2
den prinzipiellen Ablauf zweier einander folgender Spülprogramme der Geschirrspülmaschine gem. Fig. 1.
Show:
Fig. 1
the longitudinal section of a household dishwasher and
Fig. 2
the basic sequence of two successive washing programs of the dishwasher according to Fig. 1.

Eine Haushalts-Geschirrspülmaschine umfaßt einen Spülbehälter 1 zum Anordnen von Spülgut sowie drei Sprüheinrichtungen, einen unteren Sprüharm 3, einen oberen Sprüharm 5 und eine Deckendusche 7. Die Sprüheinrichtungen 3, 5, 7 werden von einer Umwälzpumpe 9 mit Spülflüssigkeit gespeist. Die Umwälzpumpe 9 saugt die Spülflüssigkeit aus dem Sumpf 11 des Spülbehälters 1 an, in welchem sich die rücklaufende Spülflüssigkeit sammelt. Der Umwälzpumpe 9 nachgeschaltet ist ein Umsteuerventil 13, welches die von der Umwälzpumpe 9 zugeführte Spülflüssigkeit abwechselnd einem Steigrohr 15 oder einem Verbindungsschlauch 17 zuführt. Das Steigrohr 15 führt die Spülflüssigkeit dem oberen Sprüharm 5 zu. Der Verbindungsschlauch 17 verzweigt sich in ein Verbindungsstück 19 zum unteren Sprüharm 3 und in einen Anschlußschlauch 21, der andernends mit der Deckendusche 7 gekoppelt ist. Die Zufuhr von Frischwasser erfolgt durch einen Wasserzulaufschlauch 25. Die Spülflüssigkeit wird am Ende des Spülprogrammes mit Hilfe einer Entleerungspumpe 27 aus dem Gerät entfernt. Die Geschirrspülmaschine weist weiterhin einen Trübungssensor 23, welcher am Anschlußschlauch 21 angekoppelt ist, zur Ermittlung des Verschmutzungsgrades der Spülflüssigkeit auf.A household dishwasher includes one Rinsing container 1 for arranging items to be washed and three Spray devices, a lower spray arm 3, an upper Spray arm 5 and a ceiling shower 7. The spray devices 3, 5, 7 are from a circulation pump 9 with rinsing liquid fed. The circulation pump 9 sucks out the rinsing liquid the sump 11 of the washing container 1, in which the returning rinsing liquid collects. The circulation pump 9 is connected downstream of a reversing valve 13, which the the rinsing liquid supplied to the circulating pump 9 alternately a riser pipe 15 or a connecting hose 17 supplies. The riser pipe 15 carries the rinsing liquid upper spray arm 5 too. The connecting hose 17 branches itself in a connector 19 to the lower spray arm 3 and in a connecting hose 21, the other with the Ceiling shower 7 is coupled. The supply of fresh water takes place through a water supply hose 25 Flushing liquid is used at the end of the washing program a drain pump 27 removed from the device. The Dishwasher also has a turbidity sensor 23, which is coupled to the connecting hose 21 for Determination of the degree of contamination of the rinsing liquid on.

Der Trübungssensor 23 wird für eine unbeeinflußte Messung des Verschmutzungsgrades mit den sich ändernden Bedingungen am Meßort abgeglichen. Dieser Abgleich erfolgt zu Beginn eines Spülprogrammes, wobei auf eine Abgleichsmessung A im vorhergehenden Spülprogramm zurückgegriffen wird. Die Abgleichsmessung A erfolgt bei unverschmutzter Spülflüssigkeit unmittelbar nach dem Frischwasser-Füllvorgang zu Beginn eines Klarspülganges.The turbidity sensor 23 is used for an uninfluenced measurement the degree of pollution with the changing conditions compared at the measuring location. This comparison takes place at the beginning of a washing program, with a calibration measurement A in previous washing program is used. The Calibration measurement A is carried out when it is not contaminated Flushing liquid immediately after the fresh water filling process at the beginning of a rinse cycle.

Im folgenden wird gemäß Fig. 2 der prinzipielle Ablauf der beiden Spülprogramme beschrieben, wobei als Spülprogramm X-1 das Programm bezeichnet wird, in dem vordergründig die Abgleichsmessung A, die die Grundlage für den Abgleich des Trübungssensors 23 im Spülprogramm X bildet, zu betrachten ist.In the following, the basic sequence of the described two rinse programs, being the rinse program X-1 is the name of the program in which the Adjustment measurement A, which is the basis for the adjustment of the Turbidity sensor 23 in the washing program X forms to consider is.

Spülprogramm X-1 ist zumindest als Voreinstellung im wesentlichen aufgeteilt in die wasserführenden Spülgänge Vorspülen, Reinigen, Zwischenspülen und Klarspülen, sowie einen abschließenden Trocknungsvorgang. Jeder wasserführende Spülgang beginnt mit einem Wasserzulauf und wird mit einem Abpumpvorgang der Spülflüssigkeit beendet. In den Spülgängen Reinigen und Klarspülen erfolgt eine Zugabe von Reinigungs- bzw. Klarspülmitteln. Außerdem erfolgt unmittelbar nach dem Wasserzulauf im Klarspülgang eine Abgleichsmessung A für den Trübungssensor 23. Dazu wird eine Messung des Verschmutzungsgrades bei der vorliegenden klaren Spülflüssigkeit vorgenommen und der ermittelte Signalwert für diesen Verschmutzungsgrad 0 von einer nicht dargestellten elektronischen Programmsteuerung erfaßt und in einem nicht-flüchtigen Speicher, einem sog. EEPROM, abgespeichert.Washing program X-1 is at least as a default in the essentially divided into the water-carrying rinse cycles Pre-rinse, clean, rinse and rinse, as well a final drying process. Everyone water-carrying rinse starts with a water inlet and is ended with a pumping process of the rinsing liquid. In the rinse and rinse cycles, there is a Add detergent or rinse aid. Moreover takes place immediately after the water supply in the rinse aid a calibration measurement A for the turbidity sensor 23 is a measurement of the degree of pollution at the available clear rinsing liquid and the determined signal value for this degree of pollution 0 from an electronic program control, not shown recorded and in a non-volatile memory, a so-called EEPROM, saved.

Zu Beginn des Spülprogrammes X, welches ebenfalls als Voreinstellung die Spülgänge Vorspülen, Reinigen, Zwischenspülen und Klarspülen und den abschließenden Trocknungsgang umfaßt, wird der gespeicherte Signalwert für den Abgleich des Trübungssensors 23 ausgelesen und der Trübungssensor 23 mittels des Abgleichswertes kalibriert. Alle nachfolgenden Messungen des Verschmutzungsgrades während Spülprogramm X sind auf diese Weise auf diesen Abgleichmeßwert bezogen.At the beginning of the washing program X, which is also called Presetting the rinse cycles, rinse, clean, Intermediate rinse and rinse and the final Drying cycle includes, the stored signal value for read the adjustment of the turbidity sensor 23 and the Turbidity sensor 23 calibrated using the adjustment value. All subsequent measurements of the degree of contamination during washing program X are on this in this way Adjustment measured value related.

Nach dem Abgleich des Trübungssensors 23 erfolgt der Wasserzulauf für den Vorspülgang und der Spülvorgang wird gestartet. Nach ca. sechs Minuten und nach ca. acht Minuten werden je eine Messung B, C durchgeführt und aus den beiden Meßwerten ein Mittelwert gebildet. Unterschreitet der Mittelwert des Verschmutzungsgrades einen vorbestimmten Wert, wird der folgende Wasserwechsel (Wasserwechsel zum Programmschritt "Reinigen") ausgeblendet und das Reinigungsmittel dosiert. Es erfolgt somit ein unmittelbarer Übergang vom Vorspülgang in den Reinigungsgang ohne Wechsel der Spülflüssigkeit. Bleibt der Mittelwert über dem vorbestimmten Wert, wird der Wasserwechsel ausgeführt, so daß der voreingestellte Spülprogrammablauf an dieser Stelle nicht verändert wird.After the adjustment of the turbidity sensor 23, the Water inlet for the pre-rinse cycle and the rinse cycle will started. After about six minutes and after about eight minutes a measurement B, C is carried out and from the two Measured values formed an average. Falls below Average value of the degree of contamination a predetermined Value, the following water change (water change to Program step "cleaning") and the Detergent dosed. So there is a immediate transition from the pre-wash cycle to the Cleaning cycle without changing the rinsing liquid. That remains Average over the predetermined value, the Water changes carried out so that the preset The wash program sequence is not changed at this point.

Im Zwischenspülgang wird ein zweites Mal der Verschmutzungsgrad ermittelt. Dazu werden wiederum zwei Messungen D, E durchgeführt, diesmal nach ca. zwei Minuten und nach ca. vier Minuten. Wiederum wird aus den beiden ermittelten Meßwerten ein Mittelwert gebildet. Unterschreitet der Mittelwert einen weiteren vorbestimmten Wert, erfolgt an dieser Stelle kein Eingriff in den Programmablauf. Bleibt dagegen der Mittelwert über dem vorbestimmten Wert, wird ein Wasserwechsel durchgeführt und ein zweiter Zwischenspülgang in den Spülprogrammablauf eingefügt.In the intermediate rinse cycle, the Degree of pollution determined. In addition there will be two Measurements D, E carried out, this time after about two minutes and after about four minutes. Again, the two become determined measured values formed an average. If the mean falls below a further predetermined value Value, there is no intervention in the Program Sequence. In contrast, the mean remains above that predetermined value, a water change is carried out and a second intermediate rinse in the wash program inserted.

Im weiteren Verlauf des Spülprogrammes wird wieder nach dem Füllvorgang im Klarspülgang eine Abgleichsmessung A vorgenommen und der gemessene Wert als Abgleichsmeßwert für das nicht dargestellte Spülprogramm X+1 in dem EEPROM abgespeichert.In the further course of the washing program, again after the Filling process in the final rinse cycle a calibration measurement A made and the measured value as a calibration measured value for the washing program X + 1, not shown, in the EEPROM stored.

Claims (5)

  1. Domestic appliance with a measuring device for determining the degree of contamination of a cleaning fluid, wherein the measuring device may be calibrated to the changing conditions in the measuring site, characterised in that a measurement for calibration of the measuring device (23) during a cleaning programme (programme X) may be determined in a preceding cleaning programme (programme X-1).
  2. Domestic appliance according to claim 1, characterised in that the measurement for calibration of the measuring device (23) may be determined in a part of the programme where the rinsing fluid is uncontaminated.
  3. Domestic appliance according to claim 1 or 2, characterised in that the measurement for calibration of the measuring device (23) may be determined at the end of the preceding rinse programme (programme X-1).
  4. Domestic appliance according to one of claims 1 to 3, characterised in that the measurement may be stored in a non-volatile memory.
  5. Domestic appliance according to claim 4, characterised in that if a memory value is lacking, a pre-defined value may be adopted as the measurement.
EP98100429A 1997-02-17 1998-01-13 Household apparatus with a measuring device for determining the contamination degree of the cleaning liquid Expired - Lifetime EP0862892B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19705926A DE19705926A1 (en) 1997-02-17 1997-02-17 Household appliance with a measuring device for determining the degree of contamination of a cleaning liquid
DE19705926 1997-02-17

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EP0862892A2 EP0862892A2 (en) 1998-09-09
EP0862892A3 EP0862892A3 (en) 1999-02-17
EP0862892B1 true EP0862892B1 (en) 2003-06-25

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19938010A1 (en) * 1999-08-11 2001-02-15 Bsh Bosch Siemens Hausgeraete Process for controlling, regulating and documenting a cleaning process
DE10057210A1 (en) * 2000-11-17 2002-05-23 Miele & Cie Automatic control of washing process in dishwasher involves correcting on-going washing process if appropriate depending on e.g. washing water cloudiness, rate of temperature rise
DE10111006A1 (en) * 2001-03-07 2002-11-07 Miele & Cie Method for adjusting a turbidity sensor
DE10248538A1 (en) * 2002-10-17 2004-04-29 Aweco Appliance Systems Gmbh & Co. Kg Water dirtiness measurement method for use with a dishwasher, whereby the heating rate of an electrical heating element is used as an indicator, in conjunction with a computation or look-up function, of water dirtiness
DE102004035848A1 (en) * 2004-07-23 2006-03-23 BSH Bosch und Siemens Hausgeräte GmbH Method for calibrating sensors
KR102634113B1 (en) * 2019-06-21 2024-02-05 엘지전자 주식회사 Method, apparatus and system for detecting contamination of laundry tub using composite sensor
DE102020130960B4 (en) 2019-12-02 2024-03-28 Miele & Cie. Kg Method for operating a washing program for cleaning items to be washed in a dishwasher
DE102020212542A1 (en) * 2020-10-05 2022-04-07 BSH Hausgeräte GmbH Laundry care device with a control

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Publication number Priority date Publication date Assignee Title
JPH04279136A (en) * 1991-03-06 1992-10-05 Mitsubishi Electric Corp Dish washer
DE19528978C2 (en) * 1995-08-07 2001-05-17 Bsh Bosch Siemens Hausgeraete Method for comparing an optoelectronic device for determining a washing success in a washing machine or dishwasher

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DE19705926A1 (en) 1998-08-20
EP0862892A3 (en) 1999-02-17
DE59808776D1 (en) 2003-07-31
EP0862892A2 (en) 1998-09-09

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