EP2267214B1 - Procédé d'estimation de la charge de vêtements dans un sèche-linge domestique et séchoir utilisant ce procédé - Google Patents

Procédé d'estimation de la charge de vêtements dans un sèche-linge domestique et séchoir utilisant ce procédé Download PDF

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Publication number
EP2267214B1
EP2267214B1 EP09163389.1A EP09163389A EP2267214B1 EP 2267214 B1 EP2267214 B1 EP 2267214B1 EP 09163389 A EP09163389 A EP 09163389A EP 2267214 B1 EP2267214 B1 EP 2267214B1
Authority
EP
European Patent Office
Prior art keywords
load
clothes
time
conductivity
dryer
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.)
Not-in-force
Application number
EP09163389.1A
Other languages
German (de)
English (en)
Other versions
EP2267214A1 (fr
Inventor
Davide Colombo
Daniele Martinello
Paolo Spranzi
James P. Carow
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.)
Whirlpool Corp
Original Assignee
Whirlpool Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to PL09163389.1T priority Critical patent/PL2267214T3/pl
Priority to EP09163389.1A priority patent/EP2267214B1/fr
Publication of EP2267214A1 publication Critical patent/EP2267214A1/fr
Application granted granted Critical
Publication of EP2267214B1 publication Critical patent/EP2267214B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • 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
    • D06F2103/60—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to auxiliary conditioning or finishing agents, e.g. filling level of perfume tanks
    • 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
    • D06F2105/42—Detergent or additive supply
    • 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 present invention relates to a method for estimating the load of clothes in a household tumble dryer, such dryer being provided with a contact band or strip for moisture measuring circuit.
  • a known tumble dryer is composed by the following components: a rotating drum actuated by an electric motor aimed at containing a certain amount of clothes inside; a heating element that heats the air to be blown inside the drum according to a predefined number of heating power levels; an air channel that conveys air either outside the appliance (vented dryer) or to a condenser (condensing dryer); two temperature sensors that measure the air temperature before entering the drum and the air temperature at the drum outlet; at least a contact strip normally used to measure the conductivity or resistivity of wet clothes; an optional spray nozzle used, in some dryer, to spray water and/or chemical substances on dry clothes in order to refresh them; a control unit that is able to read the actual value of the temperature sensors and of the other available sensors, including the conductivity value of the clothes and it is able to store the values in some memory registers
  • the algorithm disclosed by such document is based on the comparison, after a predetermined fixed drying time has elapsed, of the actual measured voltage (across contact strips or the like) and a predetermined voltage limit, in order to assess whether a small or large load signal has to be generated within the central process unit of the dryer.
  • This known method has the drawback of not providing reliable signals on loads due to the determination of a single minimum value of conductivity. Moreover this method can only distinguish between a large or small load signals, giving therefore only a very rough possibility of adjusting the drying cycle on the basis of load size. Then, in order to increase the reliability of such rough assessment, the above document teaches to check the load estimation value by comparing it to a load signal generated by monitoring air flow temperature, therefore increasing the complexity and cost of the estimation system.
  • EP 1988209 discloses a method of controlling a tumble laundry drier in which the weight of the laundry inside the drum is estimated by evaluating the noise level of signals related to electrical resistance of conductivity measured between two electrodes placed on the door of the dryer. Such method can only provide a rough estimation of the weight.
  • an electrical parameter linked to the conductivity of the load of clothes vs. time for instance the area under the curve conductivity/time, slope of such curve, time interval between two predetermined values of dryness or delay time for reaching a predetermined dryness, it is possible not only to discriminate among different values of load sizes, but also to carry out such estimation also near the end of the drying process.
  • Another advantage of the method according to the present invention is to allow the designer building an experimental relationship between conductivity target values and actual loads of clothes on the basis of input humidity target values chosen by the user.
  • the method according to the invention is used in the so called refresh cycle where the clothes are loaded dry in the dryer drum.
  • the refresh cycle it is necessary to spray water and/or chemical substances in order to reach a fixed value of humidity. If the spray flow is constant the voltage signal shape, read by the strip of the moisture measuring circuit, is strictly related to fabric mass. A big load needs more time than a smaller one to achieve the same value of humidity content.
  • the method according to the invention allows to exactly evaluating the amount of water and/or chemical used in a refresh cycle for each type of load (small, medium, big). This allows a water/chemicals/time saving.
  • the gist of the present invention is to use not only the voltage value but also the information related to its change vs. time, i.e. slope, derivatives, integral, time gap and all other voltage signal shape characteristics.
  • Figures 5 to 8 describe different relationships between fabric mass and voltage signal shape during a refresh cycle where water is prayed onto the clothes.
  • the same considerations apply to drying cycle too.
  • the voltage signal shape is strictly related to fabric mass but of course it decreases instead of growing up.
  • the voltage value is decreasing but the behaviour of big loads is different from the behaviour of small ones.
  • the time A or B elapsed between two fixed voltage values is proportional to a certain load, the shorter the time, the smaller the load.
  • the experimental diagram of figure 10 shows how the method according to the invention can discriminate not only among different load sizes (and therefore not only between "low” and "high"), but also among different final humidity values requested by the user, linking for instance the voltage curve vs. ideal values for interrupting the drying cycle, taking automatically into account the preference of the user and actual load of clothes in the dryer.
  • the strip conductivity threshold value for a certain target humidity of the clothes is strictly related to the actual load. Without a precise load assessment according to the present invention, there is the risk that for a small load the drying process is interrupted too early, therefore giving unsatisfactory drying results.
  • the algorithm inputs are:
  • the output data obtained by any known shape analysis, could be compared using a look up table or a regressor approach.
  • the final output is the fabric load estimation.
  • the "Shape analysis” stops and the "delta_time_alfa” could be processed by a regressor or a look up table in order to find the fabric load mass.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Claims (10)

  1. Procédé pour évaluer la charge de vêtements dans un sèche-linge domestique à tambour, un tel sèche-linge étant muni d'une bande de contact pour un circuit de mesure d'humidité, comprenant
    le contrôle d'un paramètre lié à la conductibilité de la charge de vêtements par rapport au temps, et
    l'évaluation de la charge de vêtements en analysant le comportement dynamique du paramètre précédent, caractérisé en ce que la phase de contrôle est effectuée après avoir commencé un mouillage des vêtements avec un débit d'eau prédéterminé et pendant un temps prédéterminé.
  2. Procédé selon la revendication 1, dans lequel la quantité d'eau et/ou de produit chimique utilisée pendant le mouillage est évaluée pour chaque type de taille de charge de vêtements.
  3. Procédé selon la revendication 1, dans lequel la phase de contrôle est effectuée dans la phase finale du processus de séchage.
  4. Procédé selon la revendication 1, dans lequel ledit paramètre est sélectionné dans le groupe constitué par une surface sous la courbe de conductibilité par rapport au temps, une forme de la courbe de conductibilité par rapport au temps, un intervalle de temps entre deux valeurs de conductibilité prédéterminées, ou un temps de retard pour atteindre une valeur de conductibilité prédéterminée.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel une valeur de conductibilité cible est déterminée sur la base de la charge évaluée de vêtements.
  6. Sèche-linge domestique à tambour, ayant une bande de contact ou analogue et un circuit de commande électrique liée pour évaluer la teneur en humidité de la charge de vêtements, le circuit de commande étant conçu pour contrôler un paramètre lié à la conductibilité de la charge de vêtements par rapport au temps et pour évaluer la charge de vêtements en analysant le comportement dynamique dudit paramètre, caractérisé en ce qu'il comprend une buse d'eau pour pulvériser de l'eau sur la charge de vêtements, la phase de contrôle étant effectuée après avoir commencé un mouillage de la charge de vêtements avec un débit d'eau prédéterminé et pendant un temps prédéterminé.
  7. Sèche-linge selon la revendication 6, dans lequel le circuit de commande est conçu pour évaluer la quantité d'eau et/ou de produit chimique utilisée pendant le mouillage pour chaque type de taille de la charge de vêtements.
  8. Sèche-linge selon la revendication 6, dans lequel la phase de contrôle est effectuée dans la phase finale du processus de séchage.
  9. Sèche-linge selon la revendication 6, dans lequel ledit paramètre est sélectionné dans le groupe constitué par une surface sous la courbe de conductibilité par rapport au temps, une forme de la courbe de conductibilité par rapport au temps, un intervalle de temps entre deux valeurs de conductibilité prédéterminée, ou un temps de retard pour atteindre une valeur de conductibilité prédéterminée.
  10. Sèche-linge selon l'une quelconque des revendications 6 à 9, dans lequel le circuit de commande est conçu pour calculer une valeur cible de conductibilité en se basant sur une valeur d'humidité cible (MR) et sur la charge évaluée de vêtements.
EP09163389.1A 2009-06-22 2009-06-22 Procédé d'estimation de la charge de vêtements dans un sèche-linge domestique et séchoir utilisant ce procédé Not-in-force EP2267214B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL09163389.1T PL2267214T3 (pl) 2009-06-22 2009-06-22 Sposób oszacowywania wsadu prania w suszarce dla gospodarstwa domowego oraz suszarka wykorzystująca taki sposób
EP09163389.1A EP2267214B1 (fr) 2009-06-22 2009-06-22 Procédé d'estimation de la charge de vêtements dans un sèche-linge domestique et séchoir utilisant ce procédé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09163389.1A EP2267214B1 (fr) 2009-06-22 2009-06-22 Procédé d'estimation de la charge de vêtements dans un sèche-linge domestique et séchoir utilisant ce procédé

Publications (2)

Publication Number Publication Date
EP2267214A1 EP2267214A1 (fr) 2010-12-29
EP2267214B1 true EP2267214B1 (fr) 2016-05-25

Family

ID=41323637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09163389.1A Not-in-force EP2267214B1 (fr) 2009-06-22 2009-06-22 Procédé d'estimation de la charge de vêtements dans un sèche-linge domestique et séchoir utilisant ce procédé

Country Status (2)

Country Link
EP (1) EP2267214B1 (fr)
PL (1) PL2267214T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9499934B2 (en) 2013-04-24 2016-11-22 Whirlpool Corporation Laundry treating appliances and methods of controlling the same to determine an end of-cycle condition
CN104200125B (zh) * 2014-09-23 2017-03-08 珠海格力电器股份有限公司 一种干衣预测时间的获取方法、装置及系统
CN106480685B (zh) * 2015-08-31 2020-02-07 青岛海尔洗衣机有限公司 一种衣物烘干方法及干衣机
CN108315988B (zh) * 2017-01-18 2020-08-21 青岛胶南海尔洗衣机有限公司 一种快速干衣机的控制方法及快速干衣机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4738034A (en) * 1985-12-16 1988-04-19 Kabushiki Kaisha Toshiba Drying machine
DE4403625C2 (de) * 1994-02-05 2003-08-07 Miele & Cie Wäschetrockner mit einer Vorrichtung zur Ermittlung des Füllgrades in der Trommel
KR100494575B1 (ko) * 2003-03-10 2005-06-10 엘지전자 주식회사 습도센서를 이용한 건조 장치 및 방법
CA2505565C (fr) 2005-04-28 2008-09-16 Camco Inc. Dispositif et methode de commande d'un seche-linge
EP1988209B1 (fr) * 2007-04-30 2011-01-05 Electrolux Home Products Corporation N.V. Procédé pour la commande d'un sèche-linge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2267214A1 (fr) 2010-12-29
PL2267214T3 (pl) 2016-10-31

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