EP2183423B1 - Method for the control of a washing process - Google Patents

Method for the control of a washing process Download PDF

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Publication number
EP2183423B1
EP2183423B1 EP08774999A EP08774999A EP2183423B1 EP 2183423 B1 EP2183423 B1 EP 2183423B1 EP 08774999 A EP08774999 A EP 08774999A EP 08774999 A EP08774999 A EP 08774999A EP 2183423 B1 EP2183423 B1 EP 2183423B1
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EP
European Patent Office
Prior art keywords
washing
course
turbidity
washing agent
detergent
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EP08774999A
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German (de)
French (fr)
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EP2183423A1 (en
Inventor
Ingo Schulze
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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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
    • 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
    • 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
    • D06F33/37—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of metering of detergents or additives
    • 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
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • 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
    • D06F2105/58—Indications or alarms to the control system or to the user
    • 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
    • D06F2105/62—Stopping or disabling machine operation

Definitions

  • the invention relates to a method for controlling a washing process in a programmable controller controllable washing machine, which is equipped with a Waschstoffein réelleeindchtung and with a sensor for detecting a value for the turbidity of the washing liquid.
  • a washing machine for carrying out the method is also specified.
  • An initially designated method is out DE 36 03 323 A1 known.
  • the sensor is used to measure the turbidity of the liquor flowing through a circulation line in order to control processes in the laundry treatment by means of its turbidity values. Further details are not included in the cited disclosure.
  • WO 2006/050767 For example, a method for determining a property of a fluid for a household appliance is known. This should make it possible to make statements about the fluid turbidity and its change in a simple manner and derive properties associated with the optical turbidity of the fluid, derived therefrom (eg, washing or detergent type). How such statements are made, how they are processed and what influences they have does not emerge from this revelation.
  • JP 05 220292 A US 5 438 507 A .
  • JP 04 166194 A and JP 05 345094 A known.
  • a fluid turbidity is detected and depending on the type or type of detergent used closed.
  • the fluid turbidity is detected in these methods after the detergent has been added to the fluid. According to these methods, the washing process is controlled depending on the determined detergent type.
  • the invention has for its object to set up a method described above so that detected in a washing machine, the random and indefinite use of different types of detergent and automatically taken into account in the called washing process to avoid erroneous interpretations of the actual haze caused by laundry soiling.
  • detergent types are to be understood as meaning those which differ from one another due to cloudiness due to embedded particles or without such particles.
  • These are, for example, powdered detergents ( Fig. 1 and 2 ) on the one hand and on the other hand liquid detergents ( Fig. 3 ).
  • Powdered detergents also differ in those which contain completely soluble powder fractions ( Fig. 1 ), and those whose powdery particles do not dissolve ( Fig. 2 ).
  • Liquid detergents ( Fig. 3 ) always dissolve completely, so they have no insoluble particles. Once recognized, which type of detergent was used, this finding should influence the selected wash program.
  • this object is achieved by a method described in the characterizing part of claim 1, characterized in that over a certain period of a portion of the washing process, during which the washing liquid is supplied detergent, the course of the turbidity values is recorded and recorded that from the recorded history of the detergent type is determined and that the washing process is controlled depending on the particular type of detergent.
  • the type of detergent used can now be determined in a simple manner and the selected washing program can be modified with regard to this type of detergent.
  • the measured values of the turbidity determined during the continuous washing process can now be related to a turbidity of the washing liquid caused by the detergent used.
  • powder detergents generally trigger a high initial turbidity, in the further course they show a constant or even falling turbidity, which increases slightly depending on the dirt load from the laundry to be washed.
  • Liquid detergents initially cause a relatively slight turbidity, which is predominantly due to foam which may be formed, and generally increases in the course of time as a function of the amount of dirt introduced.
  • Powdered detergents still differ significantly from one another in that completely soluble powder causes a very high initial haze, which decreases very rapidly (depending on the dissolving behavior), while washing powders with insoluble particles (eg in the case of zeolite powders) cause a comparatively lower initial haze. which, with increasing detachment of particle-containing contamination additively to turbidity from the powder particles (eg builders of zeolite) soon increases again to the level of the initial turbidity.
  • the diagram line PL1 in Fig. 1 shows in period A a steep increase in turbidity T to a high value, which is arranged by a sensor in a reasonably turbulent area of the washing machine, is detected.
  • the detergent is removed from a detergent dispenser (see, for example, US Pat DE 36 03 323 A1 ) supplied by means of fresh water the laundry treatment room.
  • B indicates the dissolution phase and shows almost completely disappeared values for the turbidity used for the completely soluble detergent used.
  • Only after the onset of the particulate soiling detachment process in section C does the turbidity T rise again. At these values, the dissolved detergent has virtually no share; From then on, its proportion is only equal to the initial value at the beginning of section C. Therefore, virtually all the values measured afterwards are due to the soiling of the laundry.
  • Fig. 1 to 3 the dashed diagram line O is also shown, which represents the turbidity curve of a washing liquid, if no detergent is used at all. It is to be assumed that even then a small part of the dirt particles of the laundry will be transferred into the washing liquid, so that the turbidity values T will increase slowly over the time t, but of course remain well below those values which occur when using Adjust detergents.
  • the determined and recorded course of the turbidity values T over the time t is compared with stored progressions, each of which stands for a certain type of detergent. Since different types of detergent types are likely to deviate from this stored course to some extent, the comparison may not be drawn very sharply. Under no circumstances may the permissible tolerance range overlap with the tolerance range of the curve of another type of detergent, so that the selection is ensured.
  • the curve PL2 of the turbidity values T in Fig. 1 However, while the course PL1 has been caused, for example, by a wool wash powder, the course PL2 may originate, for example, from a washing powder for cotton wool. Corresponding deviations can be found in FIGS. 2 and 3 are also registered if they have been caused by detergents of another type but of the same type.
  • Such automatic detection of the detergent used also entails an equally automatic adjustment of the washing process.
  • corresponding process settings are made for the detection and comparison of the turbidity values T with thresholds. This can affect both the washing process and the rinsing process.
  • the result of the automatic detergent detection can be optically signaled, z.
  • such a stored history can be generated by an expert system that examines all processes for matches and deviations, classified and then makes appropriate adjustments automatically.
  • an expert system that examines all processes for matches and deviations, classified and then makes appropriate adjustments automatically.
  • such a system can follow changing conditions on the market of detergents, so that the inventive method requires no external care.
  • a washing machine in which a method according to the invention is to be carried out expediently has a detergent dispensing device with at least one chamber in which optionally a portion of a powdered or a liquid detergent can be held.
  • a slide can be provided in such a chamber as a flow seal, which is pushed when using liquid detergent in the working position. When using washing powder, it is then placed upwards from this position, so that the washing powder can be washed out freely when fresh water is supplied.
  • a washing machine designed according to the invention can also be equipped with an automatic detergent dosing system in addition to the detergent dispensing device for the hand-dosed portioning of washing powder or liquid detergent. If the customer has not prepared any hand-dosed detergent portion for a selected washing program, then the method according to the invention can also detect this condition by registering the course of the turbidity according to the diagram line O. The comparison of this course with a correspondingly stored course automatically leads to the result "no detergent available". In the case of a washing machine without an additional automatic detergent dosing system, this will lead to a standstill of the washing machine and the corresponding signaling "washing agent is missing". However, if the washing machine has an automatic dosing system, then the control unit can also automatically switch over to the use of this dosing system.

Abstract

The method for the control of a washing process is to be carried out in a washing machine controllable with a program control device. The washing machine is to be equipped for this purpose with a detergent-adding device and with a sensor for the detection of a value T for the clouding of the washing liquid. So that the washing machine recognizes the type of detergent used and can adapt the chosen washing process thereto, the course PL1, PL2 of the clouding values T are detected and plotted for a certain duration D of a section A+B of the washing process, during which detergent is added to the washing liquid. In addition the detergent type is determined from the plotted course PL1, PL2, and the washing process

Description

Die Erfindung betrifft ein Verfahren zum Steuern eines Waschprozesses in einer durch ein Programmsteuergerät steuerbaren Waschmaschine, die mit einer Waschmitteleinspüleindchtung und mit einem Sensor zum Erfassen eines Wertes für die Trübung der Waschflüssigkeit ausgestattet ist. Außerdem ist auch eine Waschmaschine zum Durchführen des Verfahrens angegeben.The invention relates to a method for controlling a washing process in a programmable controller controllable washing machine, which is equipped with a Waschmitteleinspüleindchtung and with a sensor for detecting a value for the turbidity of the washing liquid. In addition, a washing machine for carrying out the method is also specified.

Ein eingangs bezeichnetes Verfahren ist aus DE 36 03 323 A1 bekannt. Dort wird der Sensor zur Messung der Trübung der durch eine Umlaufleitung flutenden Lauge benutzt, um mittels deren Trübungswerte Prozesse bei der Wäschebehandlung zu steuern. Nähere Angaben hierzu sind in der genannten Offenbarung nicht enthalten.An initially designated method is out DE 36 03 323 A1 known. There, the sensor is used to measure the turbidity of the liquor flowing through a circulation line in order to control processes in the laundry treatment by means of its turbidity values. Further details are not included in the cited disclosure.

Es ist aus DE 29 17 859 A1 auch ein Verfahren zum Überwachen und Steuern des Programms einer automatischen Waschmaschine bekannt, bei der die Parameter "Oberflächenspannung", "Adhäsionskraft", "elektrische Leitfähigkeit" oder "pH-Wert" der Waschflüssigkeit verarbeitet werden. Aus einem Vergleich eines Messwertes eines dieser Parameter mit einem Sollwert wird eine Programmmaßnahme abgeleitet. Auch bei einem Verfahren zur Waschmittelerkennung einer Waschmaschine nach EP 666 358 A1 wird als Parameter der Waschflüssigkeit die "elektrische Leitfähigkeit" bzw. der "elektrische Widerstand" ermittelt.It is off DE 29 17 859 A1 also discloses a method for monitoring and controlling the program of an automatic washing machine, wherein the parameters "surface tension" , "adhesion force", "electrical conductivity" or "pH" of the washing liquid are processed. A program measure is derived from a comparison of a measured value of one of these parameters with a setpoint value. Also in a method for detergent detection of a washing machine after EP 666 358 A1 is determined as a parameter of the washing liquid, the "electrical conductivity" or the "electrical resistance".

Aus WO 2006/050767 ist ein Verfahren zum Ermitteln einer Eigenschaft eines Fluids für ein Haushaltgerät bekannt. Damit soll es möglich sein, Aussagen über die Fluidtrübung sowie deren Änderung auf einfache Weise zu ermöglichen und Eigenschaften, die mit der optischen Trübung des Fluids einhergehen, daraus herzuleiten (z. B. Wasch- oder Spülmitteltyp). Wie solche Aussagen entstehen, auf welche Weise sie verarbeitet werden und welche Einflüsse sie haben, geht aus dieser Offenbarung nicht hervor.Out WO 2006/050767 For example, a method for determining a property of a fluid for a household appliance is known. This should make it possible to make statements about the fluid turbidity and its change in a simple manner and derive properties associated with the optical turbidity of the fluid, derived therefrom (eg, washing or detergent type). How such statements are made, how they are processed and what influences they have does not emerge from this revelation.

Weitere Verfahren zum Ermitteln einer Eigenschaft eines Fluids für eine Waschmaschine sind aus JP 05 220292 A , US 5 438 507 A , JP 04 166194 A und JP 05 345094 A bekannt. Bei diesen Verfahren wird eine Fluidtrübung erfasst und davon abhängig auf die Art bzw. den Typ des verwendeten Waschmittels geschlossen. Die Fluidtrübung wird bei diesen Verfahren erfasst, nachdem das Waschmittel dem Fluid zugeführt wurde. Gemäß dieser Verfahren wird der Waschprozess in Abhängigkeit des ermittelten Waschmitteltyps gesteuert.Other methods for determining a property of a fluid for a washing machine are out JP 05 220292 A . US 5 438 507 A . JP 04 166194 A and JP 05 345094 A known. In these methods, a fluid turbidity is detected and depending on the type or type of detergent used closed. The fluid turbidity is detected in these methods after the detergent has been added to the fluid. According to these methods, the washing process is controlled depending on the determined detergent type.

Der Erfindung liegt die Aufgabe zugrunde, ein eingangs beschriebenes Verfahren so einzurichten, dass in einer Waschmaschine die zufällige und unbestimmte Verwendung von unterschiedlichen Waschmitteltypen erkannt und automatisch im aufgerufenen Waschprozess berücksichtigt werden, um fehlerhafte Interpretationen über die durch Wäscheverschmutzung tatsächlich vorhandene Trübung zu vermeiden. Dabei sind unter Waschmitteltypen solche zu verstehen, die sich durch Trübungen aufgrund von eingelagerten Partikeln oder ohne solche Partikel unterscheiden. Dies sind beispielsweise pulverförmige Waschmittel (Fig. 1 und 2) einerseits und andererseits flüssige Waschmittel (Fig. 3). Pulverförmige Waschmittel unterscheiden sich außerdem noch in solche, die komplett lösliche Pulveranteile enthalten (Fig. 1), und solche, deren pulverförmige Partikel sich nicht auflösen (Fig. 2). Flüssige Waschmittel (Fig. 3) lösen sich dagegen immer vollständig auf, haben also keine unlöslichen Partikel. Sobald erkannt worden ist, welcher Waschmitteltyp verwendet wurde, soll diese Erkenntnis das gewählte Waschprogramm beeinflussen.The invention has for its object to set up a method described above so that detected in a washing machine, the random and indefinite use of different types of detergent and automatically taken into account in the called washing process to avoid erroneous interpretations of the actual haze caused by laundry soiling. Here, detergent types are to be understood as meaning those which differ from one another due to cloudiness due to embedded particles or without such particles. These are, for example, powdered detergents ( Fig. 1 and 2 ) on the one hand and on the other hand liquid detergents ( Fig. 3 ). Powdered detergents also differ in those which contain completely soluble powder fractions ( Fig. 1 ), and those whose powdery particles do not dissolve ( Fig. 2 ). Liquid detergents ( Fig. 3 ) always dissolve completely, so they have no insoluble particles. Once recognized, which type of detergent was used, this finding should influence the selected wash program.

Erfindungsgemäß wird diese Aufgabe durch ein im Kennzeichen des Anspruches 1 beschriebenes Verfahren dadurch gelöst, dass über eine bestimmte Dauer eines Abschnitts des Waschprozesses, während dessen der Waschflüssigkeit Waschmittel zugeführt wird, der Verlauf der Trübungswerte erfasst und aufgezeichnet wird, dass aus dem aufgezeichneten Verlauf der Waschmitteltyp bestimmt wird und dass der Waschprozess in Abhängigkeit vom bestimmten Waschmitteltyp gesteuert wird.According to the invention, this object is achieved by a method described in the characterizing part of claim 1, characterized in that over a certain period of a portion of the washing process, during which the washing liquid is supplied detergent, the course of the turbidity values is recorded and recorded that from the recorded history of the detergent type is determined and that the washing process is controlled depending on the particular type of detergent.

Insbesondere zu Beginn des Waschprozesses kann nun auf einfache Weise der verwendete Waschmitteltyp ermittelt werden und das gewählte Waschprogramm im Hinblick auf diesen Waschmitteltyp modifiziert werden. Insbesondere können die während des fortlaufenden Waschprozesses ermittelten Messwerte der Trübung nun in Relation gesetzt werden zu einer durch das verwendete Waschmittel verursachten Trübung der Waschflüssigkeit.In particular, at the beginning of the washing process, the type of detergent used can now be determined in a simple manner and the selected washing program can be modified with regard to this type of detergent. In particular, the measured values of the turbidity determined during the continuous washing process can now be related to a turbidity of the washing liquid caused by the detergent used.

Während nämlich Pulverwaschmittel generell eine hohe Anfangstrübung auslösen, zeigen sie im weiteren Verlauf eine im Wesentlichen abhängig von der Schmutzfracht aus der zu waschenden Wäsche leicht ansteigende, konstante oder gar abfallende Trübung. Flüssige Waschmittel hingegen verursachen anfangs eine relativ geringe Trübung, die überwiegend nur durch ggf. entstehenden Schaum bedingt ist und im weiteren Verlauf generell abhängig von der eingebrachten Schmutzmenge ansteigt. Pulverförmige Waschmittel sich noch deutlich unterscheiden untereinander dadurch, dass komplett lösliches Pulver eine sehr hohe Anfangstrübung verursacht, die (abhängig vom Löseverhalten) sehr schnell abnimmt, während Waschpulver mit unlöslichen Partikeln (z. B. bei Zeolith-Pulvern) eine vergleichsweise geringere Anfangstrübung verursachen, die mit zunehmender Ablösung partikelhaltiger Verschmutzung additiv zur Trübung aus den Pulverpartikeln (z. B. Builder aus Zeolith) bald wieder zur Höhe der Anfangstrübung anwächst.In fact, while powder detergents generally trigger a high initial turbidity, in the further course they show a constant or even falling turbidity, which increases slightly depending on the dirt load from the laundry to be washed. Liquid detergents, on the other hand, initially cause a relatively slight turbidity, which is predominantly due to foam which may be formed, and generally increases in the course of time as a function of the amount of dirt introduced. Powdered detergents still differ significantly from one another in that completely soluble powder causes a very high initial haze, which decreases very rapidly (depending on the dissolving behavior), while washing powders with insoluble particles (eg in the case of zeolite powders) cause a comparatively lower initial haze. which, with increasing detachment of particle-containing contamination additively to turbidity from the powder particles (eg builders of zeolite) soon increases again to the level of the initial turbidity.

Bliebe eine Berücksichtigung des unterschiedlichen Trübungsverhaltens der verwendeten Waschmittel unberücksichtigt, so würden Fehlinterpretationen der Trübungsmesswerte der Steuerung eine extrem falsche Aussage über die durch Wäscheverschmutzung entstehende Trübung der Waschflüssigkeit geben. Dadurch, dass die waschmittelbedingten Unterschiede erfindungsgemäß berücksichtigt werden, können solche Fehler ausgeschlossen werden.If no account was taken of the different turbidity behavior of the detergents used, misinterpretations of the turbidity values of the control system would give an extremely false statement about the turbidity of the washing liquid resulting from laundry soiling. Due to the fact that the detergent-related differences are taken into account according to the invention, such errors can be ruled out.

Anhand der Zeichnung ist das erfindungsgemäße Verfahren näher erläutert. Es zeigen

Fig. 1
ein Diagramm des Verlaufs der Trübung über die Zeit bei einem komplett löslichen Waschpulver,
Fig. 2
ein Diagramm gemäß Fig. 1 für ein Waschpulver mit unlöslichen Zeolith- Partikeln und
Fig. 3
ein Diagramm gemäß Fig. 1 für ein flüssiges Waschmittel.
With reference to the drawing, the inventive method is explained in detail. Show it
Fig. 1
a diagram of the course of turbidity over time with a completely soluble washing powder,
Fig. 2
a diagram according to Fig. 1 for a washing powder with insoluble zeolite particles and
Fig. 3
a diagram according to Fig. 1 for a liquid detergent.

Die Diagrammlinie PL1 in Fig. 1 zeigt im Zeitabschnitt A einen steilen Anstieg der Trübung T auf einen hohen Wert, der durch einen Sensor in einem einigermaßen turbulenten Bereich der Waschmaschine angeordnet ist, erfasst wird. In diesem am Beginn des Waschprozesses liegenden Abschnitt A wird das Waschmittel aus einer Waschmitteleinspüleinrichtung (siehe beispielsweise DE 36 03 323 A1 ) mittels Frischwasser dem Wäschebehandlungsraum zugeführt. B bedeutet die Auflösungsphase und zeigt für das verwendete, komplett lösliche Waschmittel fast vollständig zurück gehende Werte für die Trübung. Erst nach Einsetzen des Ablösungsprozesses für die partikelhaltige Verschmutzung der Wäsche im Abschnitt C steigen die Werte für die Trübung T wieder an. An diesen Werten hat das gelöste Waschmittel praktisch keinen Anteil; denn sein Anteil entspricht fortan nur noch dem Anfangswert zu Beginn des Abschnittes C. Daher rühren praktisch alle danach gemessenen Werte von der Verschmutzung der Wäsche her.The diagram line PL1 in Fig. 1 shows in period A a steep increase in turbidity T to a high value, which is arranged by a sensor in a reasonably turbulent area of the washing machine, is detected. In this section A at the beginning of the washing process, the detergent is removed from a detergent dispenser (see, for example, US Pat DE 36 03 323 A1 ) supplied by means of fresh water the laundry treatment room. B indicates the dissolution phase and shows almost completely disappeared values for the turbidity used for the completely soluble detergent used. Only after the onset of the particulate soiling detachment process in section C does the turbidity T rise again. At these values, the dissolved detergent has virtually no share; From then on, its proportion is only equal to the initial value at the beginning of section C. Therefore, virtually all the values measured afterwards are due to the soiling of the laundry.

Der in Fig. 1 gezeigte Verlauf der Linie PL1 ist daher (auch noch mit geringen Abweichungen) typisch für alle eingesetzten Waschmittel, die vollständig in Lösung gehen. Der Anstieg der Trübung im Abschnitt C lässt sich daher nahezu allein auf eine mehr oder weniger starke Verschmutzung der Wäsche zurückführen.The in Fig. 1 shown course of the line PL1 is therefore (even with minor differences) typical of all detergents used, which go completely in solution. The increase in turbidity in section C can therefore almost exclusively be attributed to a more or less severe soiling of the laundry.

Anders bei Verwendung von pulverförmigen Waschmitteln, die unlösliche Bestandteile enthalten, insbesondere solchen aus Zeolith: Der relative Anteil von löslichen Bestandteilen solcher Waschmittel ist kleiner als bei komplett löslichen Waschmitteln. Entsprechend geringer ist der Anstieg der Diagrammlinie PU der Trübung T im Abschnitt A der Fig. 2 als dem der Fig. 1. Da die relativ geringen löslichen Anteile des Waschmittels im Abschnitt B in Lösung gehen, fällt der Abfall des Trübungswertes T gering aus. Es verbleiben nämlich noch die unlöslichen Bestandteile weitgehend in der Waschflüssigkeit und tragen daher noch erheblich zur Trübung bei. Im weiteren Verlaufe (Abschnitt C) ziehen diese unlöslichen Bestandteile auf die Wäschefasern auf; denn sie sind verhältnismäßig scharfkantig und verhaken sich daher in der Wäsche. Wenn die in diesem Prozess gewaschene Wäsche nicht besonders schmutzig ist, überwiegt die Verminderung der unlöslichen Bestandteile des Waschmittels innerhalb der Waschflüssigkeit durch Aufziehen auf die Wäsche über das Ablösen von Schmutzpartikeln der Wäscheverschmutzung und deren Verteilung in der Waschflüssigkeit. Daher vermindert sich die aus den unlöslichen Bestandteilen verursachte Trübung stärker, als sich diejenige aus der Ablösung der Schmutzpartikel erhöht. Insgesamt sinken daher die Werte T für die Gesamt-Trübung leicht gegenüber dem Anfangswert im Abschnitt C.Unlike when using powdered detergents containing insoluble constituents, in particular those of zeolite: The relative proportion of soluble constituents of such detergents is smaller than with completely soluble detergents. Correspondingly smaller is the increase in the graph line PU of the turbidity T in section A of FIG Fig. 2 as that of the Fig. 1 , Since the relatively small soluble fractions of the detergent go into solution in section B, the drop in the turbidity value T is small. In fact, the insoluble constituents remain largely in the washing liquid and therefore contribute considerably to clouding. In the further course (section C), these insoluble constituents attract the laundry fibers; because they are relatively sharp and therefore get caught in the laundry. If the laundry being washed in this process is not particularly dirty, the reduction of the insoluble constituents of the detergent within the washing liquid by putting it on the laundry outweighs the detachment of dirt particles of the laundry soiling and their distribution in the washing liquid. Therefore, the turbidity caused by the insoluble matter decreases more than that from the separation of the soil particles increases. Overall, therefore, the total turbidity values T decrease slightly from the initial value in Section C.

Bei Verwendung von flüssigem Waschmittel sieht der Verlauf der Diagrammlinie FL wiederum völlig anders aus: Da flüssige Waschmittel auch im unverteilten Zustand überhaupt keine trüben Partikel enthalten, steigt die Trübung im Abschnitt A nur wenig an. Auch in der Lösungsphase, in der sich das flüssige Waschmittel in der Waschflüssigkeit verteilt, kann daher kein signifikanter Abfall der maximalen Trübung erreicht werden. Daher werden die Werte für die Trübung im Abschnitt C fast allein der Ablösung von Schmutzpartikeln von der Wäsche zuzuschreiben sein.When using liquid detergent, the course of the diagram line FL again looks completely different: Since liquid detergents even in the undistributed state contain no cloudy particles, the turbidity in section A increases only slightly. Even in the solution phase, in which the liquid detergent is distributed in the washing liquid, therefore, no significant drop in the maximum turbidity can be achieved. Therefore, the values for the haze in section C will almost exclusively be attributed to the detachment of dirt particles from the laundry.

Die typischen Verläufe der Trübungswerte T bei unterschiedlichen eingesetzten Waschmitteln ergeben sich bereits aus den Abschnitten A und B. Um allerdings hinsichtlich aller möglichen Verläufe sicher zu sein, wird die Beobachtung des Verlaufs immer gleich lange dauern müssen, nämlich für die Dauer D. Diese Dauer ist so bemessen, dass auch der längste Lösungsprozess eines jemals eingesetzten Waschmittels bis zu seinem Ende beobachtet werden kann. Das Ende dieser Dauer D fällt im vorliegenden Beispiel, bei dem das in Fig. 1 voraussetzungsgemäß verwendete Waschmittel nach Ende des Abschnittes B erst gelöst ist, mit dem Ende des Abschnitts B zusammen. Die Dauer D wird dann in allen Fällen von anderen eingesetzten Waschmitteln gleich sein, also hier auch in den Fällen der Fig. 2 und 3.The typical courses of the turbidity values T with different detergents used already arise from the sections A and B. However, in order to be sure with regard to all possible courses, the observation of the course will always have to take the same time, namely for the duration D. This duration is designed so that even the longest solution process of a detergent ever used can be observed to its end. The end of this duration D falls in the present example, in which the in Fig. 1 conditionally used detergent after the end of the section B is only solved, with the end of the section B together. The duration D will then be the same in all cases of other detergents used, so here in the cases of FIGS. 2 and 3 ,

In Fig. 1 bis 3 ist außerdem noch die gestrichelte Diagrammlinie O eingezeichnet, welche den Trübungsverlauf einer Waschflüssigkeit wiedergibt, wenn überhaupt kein Waschmittel eingesetzt wird. Es ist davon auszugehen, dass auch dann noch ein geringer Teil der Schmutzpartikel der Wäsche in die Waschflüssigkeit übertreten wird, so dass die Trübungswerte T über die Zeit t hin zwar langsam ansteigen werden, aber natürlich weit unterhalb derjenigen Werte verbleiben, die sich beim Einsatz von Waschmitteln einstellen.In Fig. 1 to 3 In addition, the dashed diagram line O is also shown, which represents the turbidity curve of a washing liquid, if no detergent is used at all. It is to be assumed that even then a small part of the dirt particles of the laundry will be transferred into the washing liquid, so that the turbidity values T will increase slowly over the time t, but of course remain well below those values which occur when using Adjust detergents.

Um nun den Typus des verwendeten Waschmittels zu ermitteln, wird der ermittelte und aufgezeichnete Verlauf der Trübungswerte T über die Zeit t mit abgespeicherten Verläufen verglichen, von denen jeder für einen bestimmten Typus von Waschmitteln steht. Da unterschiedliche Arten von Waschmitteltypen von diesem abgespeicherten Verlauf wohl in einem gewissen Maße abweichen werden, darf der Vergleich nicht sehr scharf gezogen sein. Keinesfalls darf aber der zulässige Toleranzbereich sich mit dem Toleranzbereich des Verlaufes eines anderen Waschmitteltyps überschneiden, damit die Auswahl gesichert ist. Beispielsweise kann der Verlauf PL2 der Trübungswerte T in Fig. 1 denselben Typus von Waschmitteln betreffen aber eine andere Art. Während der Verlauf PL1 beispielsweise von einem Wollwaschpulver verursacht worden ist, kann der Verlauf PL2 beispielsweise von einem Waschpulver für Koch-/Buntwäsche stammen. Entsprechende Abweichungen können in Fig. 2 und 3 ebenfalls registriert werden, wenn sie durch Waschmittel anderer Art aber desselben Typus verursacht worden sind.In order to determine the type of detergent used, the determined and recorded course of the turbidity values T over the time t is compared with stored progressions, each of which stands for a certain type of detergent. Since different types of detergent types are likely to deviate from this stored course to some extent, the comparison may not be drawn very sharply. Under no circumstances may the permissible tolerance range overlap with the tolerance range of the curve of another type of detergent, so that the selection is ensured. For example, the curve PL2 of the turbidity values T in Fig. 1 However, while the course PL1 has been caused, for example, by a wool wash powder, the course PL2 may originate, for example, from a washing powder for cotton wool. Corresponding deviations can be found in FIGS. 2 and 3 are also registered if they have been caused by detergents of another type but of the same type.

Eine solche automatische Erkennung des verwendeten Waschmittels zieht auch eine ebenfalls automatische Anpassung des Waschprozesses nach sich. Zum Mindesten werden für die Erfassung und den Vergleich der Trübungswerte T mit Schwellenwerten entsprechende Prozesseinstellungen vorgenommen. Dies kann sowohl den Waschprozess wie auch den Spülprozess betreffen. Schließlich kann auch das Ergebnis der automatischen Waschmittelerkennung optisch signalisiert werden, z. B. in Form einer Anzeige "Zeolith-Waschpulver", "Waschpulver löslich" oder "Flüssigwaschmittel". Stattdessen kann aber auch eine entsprechende Anpassung des Waschprozesses signalisiert werden.Such automatic detection of the detergent used also entails an equally automatic adjustment of the washing process. At the minimum, corresponding process settings are made for the detection and comparison of the turbidity values T with thresholds. This can affect both the washing process and the rinsing process. Finally, the result of the automatic detergent detection can be optically signaled, z. Example in the form of a display "zeolite washing powder", "washing powder soluble" or "liquid detergent". Instead, however, a corresponding adjustment of the washing process can be signaled.

Vorteilhafterweise kann ein solcher abgespeicherter Verlauf durch ein Expertensystem generiert werden, das sämtliche Prozesse nach Übereinstimmungen und Abweichungen untersucht, klassifiziert und dann auch entsprechende Anpassungen selbsttätig vornimmt. Auf diese Weise kann ein solches System wechselnden Gegebenheiten auf dem Markt der Waschmittel folgen, so dass das erfindungsgemäße Verfahren keine externe Pflege benötigt.Advantageously, such a stored history can be generated by an expert system that examines all processes for matches and deviations, classified and then makes appropriate adjustments automatically. In this way, such a system can follow changing conditions on the market of detergents, so that the inventive method requires no external care.

Eine Waschmaschine, in der ein erfindungsgemäßes Verfahren durchgeführt werden soll, hat zweckmäßigerweise eine Waschmitteleinspüleinrichtung mit mindestens einer Kammer, in der wahlweise eine Portion eines pulverförmigen oder eines flüssigen Waschmittels vorgehalten werden kann. Beispielsweise kann in einer solchen Kammer als Fließschott ein Schieber vorgesehen sein, der bei Verwendung von flüssigem Waschmittel in die Arbeitsposition geschoben wird. Bei Verwendung von Waschpulver wird er dann aus dieser Position nach oben gesetzt, damit das Waschpulver beim Zuführen von Frischwasser ungehindert ausgeschwemmt werden kann.A washing machine in which a method according to the invention is to be carried out expediently has a detergent dispensing device with at least one chamber in which optionally a portion of a powdered or a liquid detergent can be held. For example, a slide can be provided in such a chamber as a flow seal, which is pushed when using liquid detergent in the working position. When using washing powder, it is then placed upwards from this position, so that the washing powder can be washed out freely when fresh water is supplied.

Eine erfindungsgemäß gestaltete Waschmaschine kann auch zusätzlich zur Waschmitteleinspüleinrichtung für die handdosierte Portionierung von Waschpulver oder flüssigem Waschmittel mit einem automatischen Waschmitteldosiersystem ausgestattet sein. Hat nämlich der Kunde für ein gewähltes Waschprogramm keinerlei handdosierte Waschmittelportion vorbereitet, dann kann das erfindungsgemäße Verfahren auch diesen Zustand erfassen, indem der Trübungsverlauf gemäß der Diagrammlinie O registriert wird. Der Vergleich dieses Verlaufs mit einem entsprechend abgespeicherten Verlauf führt automatisch zu dem Ergebnis "keine Waschmittel vorhanden". Bei einer Waschmaschine ohne zusätzliches automatisches Waschmitteldosiersystem wird dies zum Stillstand der Waschmaschine führen und zur entsprechenden Signalisation "Waschmittel fehlt". Hat die Waschmaschine allerdings ein automatisches Dosiersystem, dann kann das Steuergerät ebenso automatisch umschalten auf die Verwendung dieses Dosiersystems.A washing machine designed according to the invention can also be equipped with an automatic detergent dosing system in addition to the detergent dispensing device for the hand-dosed portioning of washing powder or liquid detergent. If the customer has not prepared any hand-dosed detergent portion for a selected washing program, then the method according to the invention can also detect this condition by registering the course of the turbidity according to the diagram line O. The comparison of this course with a correspondingly stored course automatically leads to the result "no detergent available". In the case of a washing machine without an additional automatic detergent dosing system, this will lead to a standstill of the washing machine and the corresponding signaling "washing agent is missing". However, if the washing machine has an automatic dosing system, then the control unit can also automatically switch over to the use of this dosing system.

Claims (12)

  1. Method of controlling a washing process in a washing machine controllable by a program control apparatus, which is equipped with a washing agent rinsing-in device and with a sensor for detection of a value (T) for the turbidity of the washing liquid, wherein
    - washing agent is fed to the washing liquid during the first section (A) lying at the beginning of the washing process,
    - the course (PL1, PL2, PU, FL) of the turbidity values (T) is detected and recorded during a second, following section (B) of the washing process, during which the washing agent fed to the washing liquid dissolves in the washing liquid,
    - the washing agent type is determined from the recorded course (PL1, PL2, PU, FL) of the second section and
    - the washing process is controlled in dependence on the determined washing agent type,
    characterised in that
    - the course (PL1, PL2, PU, FL) of the turbidity values (T) is additionally detected and recorded during the first section (A) of the washing process,
    - the course (PL1, PL2, PU, FL) of the turbidity values (T) is detected and recorded over a specific duration (D) of the first and second sections (A + B) and
    - the washing agent type is determined from the recorded course (PL1, PL2, PU, FL) of the first and second sections.
  2. Method according to claim 1, characterised in that the duration (D) is at the most so dimensioned that a washing agent, which is slowest to dissolve and is usable for the provided process and which can be fed at a maximum, goes into solution without residue.
  3. Method according to claim 1 or 2, characterised in that the section (A + B) of the washing process stands at the beginning of the washing program section.
  4. Method according to any one of claims 1 to 3, characterised in that the turbidity values (T) ascertained during the continuing washing process are placed in relation to a turbidity, which is caused by the washing agent employed, of the washing liquid.
  5. Method according to any one of claims 1 to 4, characterised in that the recorded course (PL1, PL2, PU, FL) is compared with a course stored in the program control apparatus.
  6. Method according to claim 5, characterised in that the stored course is created from an expert system which processes empirical values from preceding washing processes.
  7. Method according to any one of claims 1 to 6, characterised in that the ascertained washing agent type and/or the washing process selected thereafter is optically signalled.
  8. Method according to any one of claims 1 to 7, in which the washing process follows a rinsing process, characterised in that the rinsing process following the washing process is similarly controlled in dependence on the ascertained washing agent type.
  9. Method according to any one of claims 1 to 8, characterised in that in the program control apparatus a further turbidity course (O) of a washing liquid in which no washing agent is present is stored and that the recorded course (PL1, PL2, PU, FL) is compared with the further stored course.
  10. Method according to claim 9, characterised in that the washing machine is shut down when the comparison indicates that no washing agent is present in the washing liquid.
  11. Method according to claim 9, characterised in that a lack of washing agent is signalled when the comparison indicates that no washing agent is present in the washing liquid.
  12. Method according to claim 9, characterised in that a demand for delivery of doses, which are to be metered individually from stored washing agents, is issued by the program control apparatus when the comparison indicates that no washing agent is present in the washing liquid.
EP08774999A 2007-07-25 2008-07-10 Method for the control of a washing process Active EP2183423B1 (en)

Applications Claiming Priority (2)

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DE102007034662A DE102007034662A1 (en) 2007-07-25 2007-07-25 Method for controlling a washing process
PCT/EP2008/059039 WO2009013147A1 (en) 2007-07-25 2008-07-10 Method for the control of a washing process

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ATE502151T1 (en) 2011-04-15
DE102007034662A1 (en) 2009-01-29
EP2183423A1 (en) 2010-05-12
WO2009013147A1 (en) 2009-01-29

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