EP2959819B1 - Verfahren zum Betreiben einer Waschvorrichtung und Haushaltsgerät damit - Google Patents

Verfahren zum Betreiben einer Waschvorrichtung und Haushaltsgerät damit Download PDF

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Publication number
EP2959819B1
EP2959819B1 EP14173587.8A EP14173587A EP2959819B1 EP 2959819 B1 EP2959819 B1 EP 2959819B1 EP 14173587 A EP14173587 A EP 14173587A EP 2959819 B1 EP2959819 B1 EP 2959819B1
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Prior art keywords
washing
conductivity
condition
conductivity measurements
detergent
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English (en)
French (fr)
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EP2959819A1 (de
Inventor
Elena Pesavento
Federico DEL MASCHIO
Andrea Zattin
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Electrolux Appliances AB
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Electrolux Appliances AB
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/006—Methods for washing, rinsing or spin-drying for washing or rinsing only
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/36—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of washing
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/20—Washing liquid condition, e.g. turbidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/10—Temperature of washing liquids; Heating means therefor
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/22—Condition of the washing liquid, e.g. turbidity

Definitions

  • the present invention is relative to a method for operating a laundry washing appliance, such as a washing machine or a combined washer-dryer, apt to wash goods in one or more washing cycles, and to a laundry washing appliance implementing the same.
  • a laundry washing appliance such as a washing machine or a combined washer-dryer
  • a washing cycle of laundry as performed by a laundry washing appliance generally comprises two phases: a washing phase and a rinse phase.
  • a wash program or process comprises one or more washing cycles and is terminated by a final spinning phase. Additional spinning steps might be present between consecutive rinsing steps during the rinsing phase.
  • the washing phase represents the portion of each washing cycle during which water is supplied into the appliance possibly together with the detergent to form a washing liquor (wetting step), the washing liquor is possibly heated (heating step), the laundry to be washed is subjected to tumbling of the drum in order to repeatedly expose it to mechanical action and to the washing liquor, so that dirt is removed from the laundry and stabilized in the washing liquor (tumbling step) and finally the washing liquor in which dirt is stabilized, is drained from the washing chamber (draining step).
  • the rinsing phase aims to remove the residuals of dirt and detergent coming from the washing phase.
  • the rinsing phase is performed stepwise, e.g. generally two or three rinsing steps are performed.
  • timing between subsequent steps of a washing phase are preset without taking into account the effective water and/or laundry conditions.
  • each next step starts independent of the completion degree of the previous one.
  • the heating of the washing liquor is usually started a preset time period from the beginning of the washing phase, independent of other conditions.
  • the beginning of the washing phase it is meant the moment when the water inlet is opened for the first time during a washing cycle and fresh water is introduced into the washing chamber.
  • the above control method monitors the constituent products deriving from the reaction of the stains in the laundry with one or more enzymes contained in the detergent introduced into the washing liquor.
  • the heating of the washing liquor is started when a plateau of the amount of constituent products is reached.
  • the stains in the laundry are not of the types reacting with enzymes (e.g. protein stains, triglyceride-based fatty stains, starch stains, guar gum stains etc.) or if the detergent contains just a low portion of enzymatic components (like e.g. powder detergents), then there will be just a very little amount of reaction constituent products and it will be not easily possible to identify a plateau in the related development.
  • enzymes e.g. protein stains, triglyceride-based fatty stains, starch stains, guar gum stains etc.
  • the control method described in EP 2 243 416 A1 comprises a measurement of the conductivity of the cleaning liquid at a certain point of time and a measurement of the conductivity of the washing liquor at a point of time after/during the detergent addition into the liquor, followed by the comparison of said values with several thresholds to determine the kind of detergent; in dependency of such determination the subsequent stages of the selected washing cycle are adjusted.
  • the conductivity values of the liquid are detected at an early stage and during the process in which the detergent is under dissolution with the liquid; due to the comparison of said values, the type of used detergent is determined.
  • liquid or gel detergents due to their high content of enzymatic components, are better active during detergent dissolution in cold water, when these components are active on a multiplicity of stain types, such as e.g. protein stains as blood, eggs etc.
  • Applicant has considered that setting a very long washing phase duration corresponding to the feasible longest detergent dissolution would imply, in most cases, an unnecessary extension of the overall wash program duration which could make the user believe that a deficiency is present in the washing apparatus itself, which is, in his/her opinion, not performing properly.
  • Applicant has thus understood that a modification in the washing appliance has to be made in order to establish a tuning between the heater ignition and the water and/or laundry conditions which offers high reliability irrespective of the detergent type used or the kind and quantity of dirt of the laundry, thereby optimizing the washing performances while keeping short the overall washing cycle duration.
  • the invention relates to a method for operating a washing appliance comprising a washing chamber to wash goods according to a wash program selected by a user including at least a washing cycle, the method including:
  • the present invention is applicable to laundry washing appliances, such as for example a washing machine or combined washer-dryer, apt to wash goods in one or more washing cycles.
  • the washing appliance generally includes a washing chamber where the laundry to be washed is loaded and then removed, after the wash program has finished.
  • water and detergent are introduced at the beginning of the washing phase of each washing cycle of the wash program selected by the user, in order to form the washing liquor which is used to wash the laundry loaded into the washing chamber.
  • washing cycle it is meant the portion of a washing program comprising a washing phase, a rinse phase and possibly a spinning step.
  • washing phase it is meant the portion of each washing cycle during which water is supplied into the appliance possibly together with the detergent to form a washing liquor (wetting step), the washing liquor is possibly heated (heating step), the laundry to be washed is subjected to tumbling of the drum (tumbling step) and finally the washing liquor is drained from the washing chamber (draining step).
  • Applicant has identified the necessity of a tuning between the detergent dissolution and the heating of the washing liquor so as to link the heater ignition to the real dissolution level of the detergent. As said above, ideally, the heating of the washing liquor should start only after all the detergent has dissolved into the same. In order to achieve this object, Applicant has had the idea of identifying the condition of detergent full dissolution and making the heater ignition dependent on the reaching of the said condition.
  • Applicant has considered that there is a correlation between detergent concentration and conductivity of water.
  • an analysis of the washing liquor conductivity leads to information on the detergent concentration and thus on the detergent dissolution degree into the washing liquor.
  • Applicant has also considered that through the measurement of the washing liquor conductivity and an appropriate analysis of the related curve, it is possible to determine if a condition of detergent full dissolution has been reached.
  • the condition of full dissolution of the detergent is considered to be optimal for the heater to be turned on. In fact, if the detergent is fully dissolved before heating of the washing liquor is started, it is assured that the action of the detergent enzymatic and bleaching components can be maxed out.
  • condition of the conductivity course identifying a condition of full dissolution of the detergent is a condition of substantial invariability of the conductivity measurements.
  • Applicant has recognized that reaching of the above substantially steady condition of the conductivity identifies a substantially complete dissolution of detergent into the washing liquor.
  • a plurality of measurements of the conductivity of the washing liquor is performed and the measured conductivity values are analysed in order to detect if the condition of substantial invariability of the conductivity measurements is reached.
  • washing appliances in case a washing appliance already comprised a conductivity sensor, said washing appliances could be easily modified in order to implement the method for operating a washing appliance according to the invention.
  • the invention may include, alternatively or in combination, one of the following features.
  • the number m of subsequent conductivity measurements to be taken into consideration for the evaluation of the steady condition is equal to or greater than two.
  • analyzing at least part of the set of conductivity measurements is performed after a first time interval from the beginning of the washing phase, namely from the moment when the water inlet is opened for the first time during a washing cycle and fresh water is introduced into the washing chamber.
  • This conditions assures a preset time interval for the detergent to dissolve into the washing liquor before the conductimetric signals are analyzed in order to determine a condition of full dissolution.
  • the analysis step of the conductivity measurements is repeated until either the steadiness condition is reached or an upper time limit has been exceeded.
  • This further condition avoids the washing cycle to last excessively in case the detection of a full dissolution condition fails.
  • a second time interval is waited before a subsequent analysis steps is performed. This conditions allows to reduce the total number of analysis steps necessary before complete dissolution is reached and the related condition of full dissolution is detected.
  • the washing appliance is a washing machine or a washer-dryer.
  • a second aspect of the present invention relates to a washing appliance comprising a washing chamber apt to receive a washing liquor used to wash goods loaded into the washing chamber and a conductivity sensor apt to be immersed in the washing liquor for performing conductivity measurements of the same, characterized in that the conductivity sensor is connected to processing and control means for the implementation of the method for operating a washing appliance as described above.
  • a laundry washing appliance operating according to the method of the invention is globally indicated with reference number 10.
  • the washing appliance 10 depicted here as the preferred embodiment, not limiting the scope and applicability of the invention, is a washing machine.
  • the washing machine 10 includes a washing chamber 12, inside of which laundry is placed before a washing program starts and removed after the washing program has completed.
  • the washing chamber 12 is preferably contained in a casing 13 having an aperture closed by a door 14 pivotably mounted on the casing 13.
  • the washing machine 10 further includes a conductivity sensor 11, preferably placed inside the washing chamber 12 or within a recirculating circuit (not shown) of the washing appliance in order to be or come in direct contact with a washing liquor 15 for performing conductivity measurements of the same.
  • a conductivity sensor 11 preferably placed inside the washing chamber 12 or within a recirculating circuit (not shown) of the washing appliance in order to be or come in direct contact with a washing liquor 15 for performing conductivity measurements of the same.
  • washing liquor 15 a water-based solution is meant, in which detergent is dissolved and in which the laundry is at least partially immersed or soaked during a washing cycle.
  • the washing liquor 15 is used to wash the laundry loaded into the washing chamber.
  • the conductivity sensor 11 is connected to a processing and/or control device (not shown in the drawings) which executes the method for operating a washing appliance 100 according to the invention.
  • the user loads the washing chamber 12 with laundry to be washed and inserts (step 110) a detergent of a given type for example into a detergent dispenser, drawer, compartment (not shown in the drawings) or directly into the washing chamber 12.
  • a detergent of a given type for example into a detergent dispenser, drawer, compartment (not shown in the drawings) or directly into the washing chamber 12.
  • the user selects a washing program among a plurality of predefined washing programs which include at least a washing cycle.
  • the water inlet is opened and fresh water is introduced 120 into the washing chamber 12 (wetting step).
  • the detergent is flushed into the washing chamber 12 during the introduction of fresh water so as to form the washing liquor 15.
  • the conductivity of the washing liquor is repeatedly measured (step 130), e.g. by means of the conductivity sensor 11.
  • the conductivity measurement is repeated at given time intervals (e.g. equal to 5 s), thereby obtaining a plurality of conductivity measured values C 1 , C 2 , C 3 ... C n . While detergent is dissolving, the conductivity measurements C 1 , C 2 , C 3 ... C n are supposed to increase continuously until all detergent is gone into solution.
  • figure 2 plots an ideal trend of conductivity over time after detergent dissolution begins.
  • the signal initially grows (up to point (C 10 ,T 10 )), then a steady condition is reached where the conductivity values do not substantially vary, also called "plateau”.
  • This formula takes into account m subsequent conductivity readings, namely a variation over a time period is considered.
  • the number m of subsequent measurements to be taken into consideration for the evaluation of the steady condition is preferably higher than two.
  • the analysis step 150 of the collected measured conductivity values C 1 , C 2 , C 3 ... C n is repeated until either the steadiness condition is reached or an upper time limit T MAX has been exceeded (step 160).
  • the heating phase (step 170) is started and the washing cycle is carried on without further delay. This avoids the washing cycle to last excessively in case the signal steadiness detection fails.
  • the analysis step 150 is done stepwise, namely if after a first analysis step 150 the steadiness condition has not been reached, further conductivity measurements (step 130) are preformed and the analysis step 150 is repeated on the newly collected set of conductivity values.
  • the subsequent analysis step 150 is delayed of a second time interval T d with respect to the previous analysis step 150, in order to reduce the total number of analysis steps necessary before complete dissolution is reached.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Claims (7)

  1. Verfahren (100) zum Betreiben einer Waschvorrichtung (10), umfassend eine Waschkammer (12) zum Waschen von Wäscheteilen gemäß einem Waschprogramm, welches von einem Benutzer ausgewählt wird und mindestens einen Waschzyklus einschließt, wobei das Verfahren einschließt:
    - Zugeben (110, 120) von Waschmittel zu einer Waschlauge (15), die während einer Waschphase des Waschzyklus in der Waschkammer (12) zirkuliert;
    - Durchführen (130) einer Vielzahl von Messungen (C1, C2, C3 ... Cn) der Leitfähigkeit der Waschlauge (15), um einen Satz von Leitfähigkeitsmessungen (C1, C2, C3 ... Cn) zu erfassen;
    - Analysieren (150) mindestens eines Teils des Satzes von Leitfähigkeitsmessungen (C1, C2, C3 ... Cn), um zu bestimmen, ob ein Zustand der wesentlichen Unveränderlichkeit der Leitfähigkeitsmessungen (C1, C2, C3 ... Cn) erreicht ist; und
    - Starten des Erwärmens (170) der Waschlauge (15), wenn der Zustand der wesentlichen Unveränderlichkeit der Leitfähigkeitsmessungen (C1, C2, C3 ... Cn) erreicht worden ist;
    wobei das Bestimmen des Zustands der wesentlichen Unveränderlichkeit der Leitfähigkeitsmessungen (C1, C2, C3 ... Cn) einschließt:
    - Vergleichen relativer Schwankungen aufeinander folgender Leitfähigkeitsmessungen (C1, C2, C3 ... Cn) gemäß der Formel: ∑ k = 0 m | C n − k − C n − 1 − k | < Schwellenwert > 0
    Figure imgb0004
    - Identifizieren eines Zustands von wesentlicher Unveränderlichkeit der Leitfähigkeit der Waschlauge, was einen Zustand der vollständigen Auflösung des Waschmittels anzeigt, wenn die Summe der relativen Schwankungen fortlaufend unter dem Schwellenwert bleibt.
  2. Verfahren (100) zum Betreiben einer Waschvorrichtung (10) nach Anspruch 1, wobei die Anzahl (m) aufeinander folgender Leitfähigkeitsmessungen (C1, C2, C3 ... Cn), die in der Auswertung des stationären Zustands berücksichtigt werden soll, gleich oder größer als zwei ist.
  3. Verfahren (100) zum Betreiben einer Waschvorrichtung (10) nach einem der Ansprüche 1 bis 2, wobei das Analysieren von mindestens einem Teil des Satzes von Leitfähigkeitsmessungen (C1, C2, C3 ... Cn) nach einem ersten Zeitintervall (Tp) ab Beginn der Waschphase durchgeführt wird.
  4. Verfahren (100) zum Betreiben einer Waschvorrichtung (10) nach einem der vorhergehenden Ansprüche, wobei der Analyseschritt (150) von mindestens einem Teil des Satzes von Leitfähigkeitsmessungen (C1, C2, C3 ... Cn) wiederholt wird, bis entweder der stationäre Zustand erreicht ist oder eine obere Zeitgrenze (Tmax) überschritten worden ist.
  5. Verfahren (100) zum Betreiben einer Waschvorrichtung (10) nach Anspruch 4, wobei nach einem Analyseschritt (150) der Leitfähigkeitsmessungen (C1, C2, C3 ... Cn) ein zweites Zeitintervall (Td) abgewartet wird, bevor folgende Analyseschritte (150) durchgeführt werden.
  6. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Waschvorrichtung eine Waschmaschine oder ein Waschtrockner ist.
  7. Waschvorrichtung (10), umfassend eine Waschkammer (12), die zum Aufnehmen einer Waschlauge (15) vorgesehen ist, die zum Waschen von Wäscheteilen verwendet wird, die in die Waschkammer (12) geladen werden, Heizmittel, die zum Erwärmen der Waschlauge (15) vorgesehen sind, die sich in der Waschkammer (12) befindet, und einen Leitfähigkeitssensor (11), der zum Eintauchen in die Waschlauge (15) vorgesehen ist, um Leitfähigkeitsmessungen derselben (15) durchzuführen, dadurch gekennzeichnet, dass sie ferner eine Verarbeitungs- und/oder Steuervorrichtung zum Implementieren des Verfahrens (100) zum Betreiben einer Waschvorrichtung gemäß einem der vorhergehenden Ansprüche umfasst.
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AU2019431628A1 (en) * 2019-02-27 2021-08-05 Electrolux Appliances Aktiebolag A method for washing laundry in a laundry washing machine and laundry washing machine implementig the method

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DE19852164A1 (de) * 1998-11-12 2000-05-25 Lang Apparatebau Gmbh Verfahren und Vorrichtung zur Erfassung der Menge eines in einem Lösungsstrom gelösten Produkts
WO2001096645A2 (en) * 2000-06-12 2001-12-20 The Procter & Gamble Company Method and system for optimizing performance of consumer appliances
EP2243416B1 (de) * 2009-04-24 2013-06-05 Electrolux Home Products Corporation N.V. Verfahren zum Betreiben eines Geschirrspülers
US8321983B2 (en) 2010-10-05 2012-12-04 Whirlpool Corporation Method for controlling a cycle of operation in a laundry treating appliance
DE102012208618A1 (de) * 2012-05-23 2013-11-28 BSH Bosch und Siemens Hausgeräte GmbH Waschmaschine und Verfahren zum Steuern einer Waschmaschine

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