EP2730694A1 - Procédé de détermination d'au moins une grandeur caractéristique de pièces de linge, et machine d'entretien du linge correspondante - Google Patents

Procédé de détermination d'au moins une grandeur caractéristique de pièces de linge, et machine d'entretien du linge correspondante Download PDF

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Publication number
EP2730694A1
EP2730694A1 EP20130190205 EP13190205A EP2730694A1 EP 2730694 A1 EP2730694 A1 EP 2730694A1 EP 20130190205 EP20130190205 EP 20130190205 EP 13190205 A EP13190205 A EP 13190205A EP 2730694 A1 EP2730694 A1 EP 2730694A1
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EP
European Patent Office
Prior art keywords
laundry
items
measured values
distribution
determined
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20130190205
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German (de)
English (en)
Other versions
EP2730694B1 (fr
Inventor
Reinhard Heyder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication of EP2730694A1 publication Critical patent/EP2730694A1/fr
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Classifications

    • 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
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/04—Quantity, e.g. weight or variation of weight
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity

Definitions

  • the invention relates to a method for determining at least one characteristic of items of laundry in a rotating laundry drum of a laundry care machine, the laundry drum being associated with electrodes by means of which measured values of electrical conductivity of the items of laundry are recorded and the characteristic value being determined from the measured values.
  • the invention also relates to a laundry care machine having a rotatable laundry drum for receiving items of laundry, wherein the laundry drum is assigned electrodes by means of which measured values of electrical conductivity of the laundry items can be received and the characteristic value can be determined from the measured values, and a programmed controller for operating the laundry care machine, to which the measured values can be fed.
  • a further parameter of the items of laundry is determined, namely the amount of load which these items of laundry represent in the laundry care machine.
  • the measured conductance values are subject to fluctuations, which are caused by changing contacts between the items of laundry and the electrodes, depending on the amount of charge present, and the loading quantity is determined from a fluctuation range of the conductance values.
  • Embodiments and examples of electrical circuits of such electrodes are the documents WO 2012/016820 A2 and EP 2 373 842 B1 removable, these circuits in programmable controls for corresponding laundry care devices can be incorporated, in particular integrable, are.
  • Electrodes are in particular fixedly mounted in a bearing plate of the tumble dryer, to which they belong, and arranged so that laundry items in the laundry drum during the fact that the laundry drum rotates, are guided past the electrodes and contact them. Care is taken to prevent these electrodes from becoming dirty or corroding to ensure long term stability for measurements. Thus, with the aid of these electrodes, measurements of electrical resistances or conductance values can be made on the items of laundry.
  • the two documents US 2012/0266486 A1 and WO 2012/072522 A2 relate to the determination of a load quantity corresponding characteristic of laundry items in a Wäschewitmaschine. For this purpose, measured values of a moisture content of the items of laundry, in particular represented by an electrical resistance, are also determined, which are subject to fluctuations or noise. According to the US 2012/0266486 A1 should be determined from a level of noise, the loading amount. On the other hand, according to the WO 2012/072522 A2 Means of the measured values are formed, which are shifted due to the existing noise, and the loading amount should be determined from these averages.
  • a general feature of measuring the electrical conductance or resistance of laundry articles in a rotary laundry drum by means of electrodes is that each individual measurement is influenced by the quality of the contact between the laundry article and the electrode and the length of the path through the laundry article between the electrodes. Therefore, measured values of the electrical conductance or resistance are obtained, which vary greatly with one another. A significant reading becomes obtained by taking over a fixed or sliding time interval sufficiently many readings and from these when measuring a conductance of an absolute maximum or a resistance measurement is selected an absolute minimum and adopted as a significant measurement.
  • a solution to the problem is represented by a method for determining at least one characteristic of items of laundry in a rotating laundry drum of a laundry care machine, the laundry drum being assigned electrodes by means of which measured values of electrical conductivity of the items of laundry are recorded, and the characteristic value being determined from the measured values in which method a time series of the measured values is recorded and a distribution of the measured values of the time series into several size classes is determined, and that the characteristic variable is determined from the size classes.
  • a solution to the problem is also represented by a laundry care machine having a rotatable laundry drum for receiving laundry items, the laundry drum being associated with electrodes by means of which measured values of electrical conductivity of the laundry items can be received and wherein the characteristic variable can be determined from the measured values, and a programmed controller for operating the laundry care machine, to which the measured values can be fed, in which laundry care machine the controller is set up to produce a time series of measured values of electrical energy To include conductivity of the laundry items as the laundry drum rotates with the laundry items, and to form a distribution of the time series measurements into size classes and to determine a characteristic of the laundry items of the size classes.
  • the invention is based on the recognition that even those measured values which are not absolute maxima or minima are significant and can be used with regard to certain characteristics of the items of laundry on which the measured values were obtained, and in particular that the fluctuations occurring are not merely stochastic , but by certain characteristics of the laundry are determined.
  • the measured values of electrical conductivity are evaluated not only with regard to individual significant quantities, in particular absolute maxima (for measurements of the conductance) or absolute minima (when measuring the resistance), but distributions analyzed in each case of many measured values in their entirety. Measured values that are not absolute maxima or absolute minima or otherwise individually significant quantities are also included in the evaluation and used to develop the desired at least one parameter.
  • a preferred embodiment of the invention is that the determined distribution is compared with a plurality of distribution patterns, wherein each distribution pattern is associated with a typical characteristic, wherein among the distribution patterns one of the determined distribution distribution pattern is determined, and wherein the characteristic of the determined distribution equal the typical characteristic of the most similar distribution pattern is determined.
  • Another preferred embodiment of the invention is that the distribution during a drying process for drying the laundry items during a period between 10% and 20% of a total duration of the drying process is determined.
  • the parameter is obtained at a relatively early stage in the drying process and is thus available to adapt the further course of the drying process to the characteristic.
  • Another preferred embodiment of the invention is that the distribution is determined during a drying process for drying the laundry items for a period between 10 minutes and 20 minutes from the beginning of the drying process. Also in this way the parameter is obtained at a relatively early stage in the drying process and is thus available to adapt the further course of the drying process to the characteristic.
  • an additional preferred embodiment of the invention is that the time series of the measured values is determined with a measuring frequency of 1 Hz.
  • a time series with 600 measured values can be obtained over a period of 10 minutes, from which the desired characteristic variable can be developed with good accuracy.
  • this period is short enough, if the corresponding method according to the invention is carried out sufficiently early in an otherwise conventionally configured process for the care of laundry items, for example in a process for drying the laundry items, to provide a characteristic which is effective for the further control of the laundry Process can be used.
  • the measurement values initially being obtained at a significantly higher frequency, for example at 250 Hz, and subsequent measurements thus obtained being subjected to preprocessing, in particular by selection, averaging, minimization or maximization, in order to derive a time series with a measurement frequency to create 1 Hz for further evaluation.
  • the measurements are taken as binary numbers of 8 bits in length or translated into such numbers.
  • the absolute values of the measured values are less important, which also depend on the geometry of the electrodes used, but rather on the distribution among measured values of different sizes. This distribution results in size classes whose relationships are used with each other for the development of the parameters.
  • a calibration of the circuit to be used to obtain the measured values may be omitted.
  • a particularly preferred embodiment of the invention is that the characteristic is a mass of the laundry items. In this way, a determination of the load of the laundry care machine is obtained by evaluating the measured values of the moisture measurement. This particular determination of the loading of the laundry care machine is possible without having to provide an additional sensor.
  • the size distribution of the measured values also includes significance for other characteristics.
  • another particularly preferred embodiment of the invention is that the characteristic is a mean moisture content of the laundry items.
  • the invention is not limited to the determination of a single characteristic. Rather, in the context of the invention, several parameters can be determined parallel to each other.
  • the two particularly preferred embodiments described above can be combined with one another within the scope of the invention, so that both the mass and the moisture of the items of laundry can be determined.
  • a size distribution of measured values can be compared with pattern distributions, which are assigned correspondingly dimensional tuples of typical characteristics, and the desired characteristics are equated with the typical characteristics of the tuple associated with the pattern distribution closest to the measured size distribution.
  • Another preferred embodiment of the invention is that the characteristic is used to control a process taking place in the laundry care machine for the care of the laundry items. More preferably, this process is intended for drying the laundry items.
  • the electrodes are fixedly mounted in the laundry care machine in the vicinity of the laundry drum. It is also within the scope of the invention to use other electrodes, such as electrodes, which are mounted in drivers of the laundry drum; Also, a metallic laundry drum may in turn be used as an electrode.
  • the laundry care machine is designed as a tumble dryer. It is within the scope of the invention to form the dryer as exhaust or circulating air dryer.
  • the heating of the process air necessary for drying can take place by means of a burner, an electric heater, a heat pump or by coupling in heat of an external heating system, in particular with a burner or solar collector.
  • any available heat sink can be used, in particular ambient air, which could be coupled via an air-air heat exchanger, or in turn a heat pump.
  • FIG. 1 shows the most important functional components, a laundry care machine 1, which is designed here as a clothes dryer 1, and without the outer housing, which surrounds such a laundry care 1 usually.
  • the laundry care machine 1 has a laundry drum 2, which is rotatable and in which laundry items 3 are inserted, which are to be dried.
  • the laundry drum 2 driven by a motor, not shown, rotates around itself, and the laundry items 3 are alternately lifted and dropped by not shown carriers in the laundry drum 2, in order to expose them evenly to a circulating process air stream 4.
  • the process air stream 4 is driven by a process air blower 5 and heated by a heater 6 before it flows around the laundry items 3 in the laundry drum 2.
  • the process air stream 4 absorbs vaporized moisture from the laundry items 3, and transports them into a cooler 7, here formed by an air-air heat exchanger 7.
  • a cooler 7 process heat is removed from the process air stream, so that the entrained moisture again condenses and precipitates from the process air stream 4, whereby it is dried.
  • the process air blower 5 and the heater 6 After again traversing the process air blower 5 and the heater 6, it returns to the laundry drum 2 to again absorb moisture until the laundry items 3 are dried.
  • the air-air heat exchanger 7 is supplied with a cooling air stream 8 from the environment of the laundry care machine 1 and, after it has passed through the heat exchanger 7, discharged again into the environment.
  • the cooling air flow 8 is driven by a cooling air blower 9.
  • heater 6 and air-air heat exchanger 7 could be replaced with great advantage by a heat pump in which the heater 6 is replaced by a heat source and the air-to-air heat exchanger 7 by a heat sink, and in which there is a means to pump heat, which is withdrawn from the process air stream 4 in the heat sink, to the heat source and to supply it to the process air stream 4 there again.
  • heat pumps are known, for example, compressor heat pumps, thermoelectric heat pumps, adsorption heat pumps, Stirling heat pumps, and Vuilleumier heat pumps.
  • electrodes 10 In order to monitor and control the process of drying the laundry items 3, electrodes 10 (in FIG Fig. 1 only one of them is visible), which can be contacted by the laundry items 3 moved in the laundry drum 2. These electrodes 10 are cooled by an electrode cooling air flow 11 so that they can form no deposits of lint, dust or the like, and are attached to a bearing plate 12 of the laundry care machine 1.
  • a programmed controller 13 which monitors and controls all the functions and process of the laundry-care machine 1, is arranged to carry out and evaluate measurements of electrical resistances or conductances between the electrodes 10.
  • Fig. 2 shows an arrangement of two electrodes 10, which are located side by side on the bearing plate 12 only partially shown and are fastened with a holder 14 on this.
  • the electrodes 10 may be cooled or uncooled; for cooled electrodes reference is made to the above-discussed document WO 2004/059072 A1 ,
  • a statement about the actual resistance or conductance of the laundry items can therefore only be obtained by forming a sliding minimum from the measured values in the case of the measurement of a resistance and a sliding maximum in the case of measuring a conductance, corresponding to a measured value for the best possible contact of one Laundry item 3 with the electrodes 20.
  • the drawing shows a new way to evaluate the measured values of resistance or conductance, using the example of the measurement of conductance. Not only is a sliding maximum determined from time series of measured values, but the distribution of the measured values itself is examined.
  • at least one characteristic 100 of items of laundry 3 in the rotating laundry drum 2 is determined, which characteristic 100 can be a resistance or conductance or a residual moisture, but need not, wherein by means of the electrodes 10 measured values 102 of electrical conductivity of the laundry items 3 are recorded, wherein the electrical conductivity may be expressed in particular as electrical resistance or as electrical conductance.
  • a time series of the measured values 102 is recorded and a distribution of the measured values 102 of the time series into a plurality of size classes 101 is determined, and then the parameter 100 is determined from the size classes 101. This takes place in the laundry care machine 1 by the appropriately set up, in particular programmed, control 13.
  • the FIGS. 3 to 5 show distribution patterns 103, which were obtained by evaluating corresponding time series of measured values 102. For this purpose, time series were taken over periods of 10 minutes (corresponding to about 10% of the duration of the entire drying process) from the beginning of a drying process. Measured values 102 were obtained as digitized values of 8 bits corresponding to a range of values from zero to 255. Shown in each figure are four different size classes, taken over five different periods of 10 minutes each. The measured values 102 themselves were obtained at a rate of 1 Hz, ie one measured value per second. Each of the FIGS. 3 to 5 thus shows five distribution patterns 103.
  • Each distribution pattern 103, two typical characteristics 104 are assigned, corresponding to an initial loading of 8 kg, 4 kg or 2 kg wet laundry, the mass specification being for the dry mass of the laundry, with an initial residual moisture content ARF of 60% for the periods of 0 distribution pattern 104 valid up to 10 minutes.
  • the residual moisture ARF is given as the ratio of the mass of the moisture contained to the mass of the dry laundry.
  • the remaining distribution pattern 104 result in the course of the drying process by increasing evaporation of moisture from the laundry to be dried and thus correspondingly less moisture contained.
  • a distribution pattern 103 that is most similar to the distribution is determined among the distribution patterns 103, and the characteristics 100 of the distribution, ie mass of the laundry and initial residual moisture is determined equal to the typical characteristics 104 of the most similar distribution pattern 103.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP13190205.8A 2012-11-13 2013-10-25 Procédé de détermination d'au moins une grandeur caractéristique de pièces de linge, et machine d'entretien du linge correspondante Active EP2730694B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201210220687 DE102012220687A1 (de) 2012-11-13 2012-11-13 Verfahren zum Ermitteln zumindest einer Kenngröße von Wäschestücken, sowie entsprechende Wäschepflegemaschine

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EP2730694A1 true EP2730694A1 (fr) 2014-05-14
EP2730694B1 EP2730694B1 (fr) 2017-06-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017219053A1 (de) * 2017-10-25 2019-04-25 BSH Hausgeräte GmbH Verfahren zur Bestimmung von Wäscheeigenschaften in einem Wäschetrockner und hierfür geeigneter Wäschetrockner

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0898009A1 (fr) * 1997-08-21 1999-02-24 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour déterminer le chargement d'un sèche -linge
DE19939272A1 (de) * 1999-08-19 2001-02-22 Bsh Bosch Siemens Hausgeraete Verfahren zur Korrektur der Trocknungsdauer in Wäschetrocknern mit feuchtegesteuerten Trocknungsprogrammen
DE10143664C1 (de) * 2001-09-06 2003-02-20 Whirlpool Corp Benton Harbor Verfahren zur Programmgestaltung des Behandlungsablaufes, insbesondere Trocknungsablaufes, in Textilbehandlungsgeräten, wie Waschmaschinen, Wäschetrockner, Wäscheschleudern u. dgl.
WO2004059072A1 (fr) 2002-12-20 2004-07-15 BSH Bosch und Siemens Hausgeräte GmbH Dispositif pour determiner la conductance du linge dans un seche-linge, seche-linge correspondant et procede visant a empecher la formation de couches sur des electrodes
WO2012007283A1 (fr) 2010-07-13 2012-01-19 BSH Bosch und Siemens Hausgeräte GmbH Procédé d'actionnement d'un appareil à sécher des vêtements, et appareil à sécher des vêtements
WO2012007299A1 (fr) 2010-07-13 2012-01-19 BSH Bosch und Siemens Hausgeräte GmbH Procédé de fonctionnement d'un sèche-linge et sèche-linge
WO2012016820A2 (fr) 2010-08-04 2012-02-09 BSH Bosch und Siemens Hausgeräte GmbH Appareil ménager destiné à sécher du linge et procédé servant à déterminer une grandeur mesurée corrélée à un degré de séchage du linge
WO2012072522A2 (fr) 2010-11-29 2012-06-07 Electrolux Home Products Corporation N.V. Procédé de commande d'un sèche-linge à tambour rotatif et sèche-linge à tambour rotatif mettant en œuvre ledit procédé
EP2373842B1 (fr) 2008-12-03 2012-10-10 BSH Bosch und Siemens Hausgeräte GmbH Appareil ménager avec une unité de mesure et procédé pour transférer une valeur de mesure
US20120266486A1 (en) 2007-04-30 2012-10-25 Electrolux Home Products Corporation N.V. Method of Controlling a Tumble Laundry Drier

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2945696C2 (de) * 1979-11-13 1982-12-30 Ako-Werke Gmbh & Co., 7988 Wangen Schaltungsanordnung zur Steuerung eines Wäschetrockners

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0898009A1 (fr) * 1997-08-21 1999-02-24 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour déterminer le chargement d'un sèche -linge
EP0898009B1 (fr) 1997-08-21 2002-05-15 BSH Bosch und Siemens Hausgeräte GmbH Procédé pour déterminer le chargement d'un sèche -linge
DE19939272A1 (de) * 1999-08-19 2001-02-22 Bsh Bosch Siemens Hausgeraete Verfahren zur Korrektur der Trocknungsdauer in Wäschetrocknern mit feuchtegesteuerten Trocknungsprogrammen
DE10143664C1 (de) * 2001-09-06 2003-02-20 Whirlpool Corp Benton Harbor Verfahren zur Programmgestaltung des Behandlungsablaufes, insbesondere Trocknungsablaufes, in Textilbehandlungsgeräten, wie Waschmaschinen, Wäschetrockner, Wäscheschleudern u. dgl.
WO2004059072A1 (fr) 2002-12-20 2004-07-15 BSH Bosch und Siemens Hausgeräte GmbH Dispositif pour determiner la conductance du linge dans un seche-linge, seche-linge correspondant et procede visant a empecher la formation de couches sur des electrodes
US20120266486A1 (en) 2007-04-30 2012-10-25 Electrolux Home Products Corporation N.V. Method of Controlling a Tumble Laundry Drier
EP2373842B1 (fr) 2008-12-03 2012-10-10 BSH Bosch und Siemens Hausgeräte GmbH Appareil ménager avec une unité de mesure et procédé pour transférer une valeur de mesure
WO2012007283A1 (fr) 2010-07-13 2012-01-19 BSH Bosch und Siemens Hausgeräte GmbH Procédé d'actionnement d'un appareil à sécher des vêtements, et appareil à sécher des vêtements
WO2012007299A1 (fr) 2010-07-13 2012-01-19 BSH Bosch und Siemens Hausgeräte GmbH Procédé de fonctionnement d'un sèche-linge et sèche-linge
WO2012016820A2 (fr) 2010-08-04 2012-02-09 BSH Bosch und Siemens Hausgeräte GmbH Appareil ménager destiné à sécher du linge et procédé servant à déterminer une grandeur mesurée corrélée à un degré de séchage du linge
WO2012072522A2 (fr) 2010-11-29 2012-06-07 Electrolux Home Products Corporation N.V. Procédé de commande d'un sèche-linge à tambour rotatif et sèche-linge à tambour rotatif mettant en œuvre ledit procédé

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017219053A1 (de) * 2017-10-25 2019-04-25 BSH Hausgeräte GmbH Verfahren zur Bestimmung von Wäscheeigenschaften in einem Wäschetrockner und hierfür geeigneter Wäschetrockner

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DE102012220687A1 (de) 2014-05-15
EP2730694B1 (fr) 2017-06-21

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