EP1006231A2 - Procédé pour contrôler la charge de linge à sécher dans un séche linge ou appareil similaire - Google Patents

Procédé pour contrôler la charge de linge à sécher dans un séche linge ou appareil similaire Download PDF

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Publication number
EP1006231A2
EP1006231A2 EP99120655A EP99120655A EP1006231A2 EP 1006231 A2 EP1006231 A2 EP 1006231A2 EP 99120655 A EP99120655 A EP 99120655A EP 99120655 A EP99120655 A EP 99120655A EP 1006231 A2 EP1006231 A2 EP 1006231A2
Authority
EP
European Patent Office
Prior art keywords
clothes
drying
washload
water
time intervals
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.)
Withdrawn
Application number
EP99120655A
Other languages
German (de)
English (en)
Other versions
EP1006231A3 (fr
Inventor
Fabrizio Bianchin
Giuseppe Frucco
Gianni Santarossa
Gennaro Napolitano
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.)
Electrolux Zanussi SpA
Original Assignee
Electrolux Zanussi SpA
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 Electrolux Zanussi SpA filed Critical Electrolux Zanussi SpA
Publication of EP1006231A2 publication Critical patent/EP1006231A2/fr
Publication of EP1006231A3 publication Critical patent/EP1006231A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • D06F2105/28—Electric heating

Definitions

  • the present invention refers to an improved method for controlling washload drying in a clothes drying apparatus or an automatic-type clothes washing and drying machine.
  • Clothes drying machines are generally known to widely use the technique based on the measurement of the residual moisture in the washload in order to appropriately control the working cycle of the machine, in particular to calculate in advance the right moment at which the drying process can be terminated in view of obtaining the desired drying result.
  • the large number of methods that are currently used to detect the drying degree of the washload, ie. the clothes to be dried, are basically of two main types, ie. temperature-based and conductivity-based methods.
  • Temperature-based methods calculate residual moisture in the clothes contained in the drum of the machine from the evolution of the temperature as measured by at least a specially provided proble that is usually arranged inside the same drum.
  • An example of temperature-based or temperometric system is described in DE-A-3 030 864.
  • Temperature-based methods are relatively simple, but scarcely accurate, in particular when they have to detect moisture in so-called “damp” cycles, ie. the cycles in which drying must be terminated before the clothes become “bone-dry", for instance when they have to be subsequently ironed.
  • Conductivity-based or conductometric methods are relatively accurate. They are based on the measurement of the conductivity of the clothes to be dried, which in turn varies in accordance with the degree of moisture in the same clothes. On the other hand, these methods are known to require the use of indesirably sophisticated control devices, as well as complicated and costly electro-mechanical component parts. As described in EP-B-0 106 283, for instance, the machine needs to be equipped with a metal rotating drum provided with two electrically conductive parts separated from each other by an insulating strip.
  • measurements may be influenced here by the degree of hardness of the water, which is known to be variable from case to case.
  • the method according to the present invention can be for instance implemented in a traditional type of clothes drying machine for home use comprising mainly a rotating drum 4 connected to a closed-loop air conduit 5 in which there are arranged aldo a blower 6, at least an electric heating element 7, or the like, as well as condensing means 8.
  • the air heated up by the electric heating element 7 is caused by the blower 6 to circulate along the conduit 5 (as shown by the arrows 18), so as to flow across the drum 4 in order to remove moisture from the clothes contained therein and cause said moisture to condense in correspondence of said condensing means 8.
  • the latter can be of any type fitting the application: in the described example, it can be noticed to be of the type cooled by the air that is circulated by a blower 9 along a conduit 10 which, through the condenser 8, is in a heat-exchange relation with the conduit 5.
  • level sensing means drive the programme sequence control unit of the machine (which is preferably of an electronic type and is not shown here for reasons of greater simplicity) with a signal that is indicative of the level reached by the water in the container 11.
  • such a container 11 is connected via a pipe 13 to a large-capacity reservoir 14 that is removably provided thereabove and communicates with the container 11 also via an overflow arrangement 15.
  • the water collecting into the container 11 is periodically conveyed into the reservoir 14 via said pipe 13 and a therewith associated pump 16, in order to be stored there until the same reservoir is totally filled.
  • Such a filled condition eventually causes water to flow over, via the overflow arrangement 15, towards the container 11, so that it can be most easily be detected by said level switch 12.
  • the programme sequence control unit of the machine is able to most suitably output an indication that the reservoir 14 is full, so that the same can be appropriately emptied.
  • the clothes drying machine can be of the type illustrated in Figure 2, which is substantially similar to the one described with reference to Figure 1.
  • the sole difference derives here from the fact that the removable reservoir 14 is arranged substantially at the same level as the container 11, to which it is only connected through a base conduit 17, so as to form a communicating-vessel system.
  • the water condensing in the condenser 8 therefore collects into the container 11 and the reservoir 14, and the level switch 12 is capable of detecting not only the level of the water in the container 11, but also the filling condition of the reservoir 14.
  • the temperature of the air flowing across the drum 4 varies in the manner shown by the curve T in Figure 3, ie. with an initial phase in which the temperature increases, an intermediate steady-state phase in which the temperature remains substantially stationary as the clothes contained in the drum are being dried, and a final phase in which the temperature increases again in a marked manner, since the clothes are now substantially dry.
  • the percentage of water that is in the clothes to be dried, and that is caused to evaporate by the flow of hot air circulated along the conduit 5 varies according to the pattern shown by the curve W in Figure 3, ie. in a gradually decreasing manner until the clothes are fully dried.
  • the curve Q in Figure 3 shows the instant amount of water removed from the clothes. During an initial phase, such an instant amount Q of water removed from the clothes can be seen to rapidly increase up to a maximum steady-state value. It then decreases in the final phase of the process, when the clothes tend to become fully dry.
  • the total amount of water removed from the clothes increases in the manner shown by the curve L in Figure 3, with a slope, or steepness, that decreases in a marked manner in the final phase when the residual moisture in the clothes tends to run out.
  • the drying state of the clothes is controlled by detecting the variation Q of the amount L of water removed from the clothes during repeated pre-established intervals of time and controlling the working programme of the machine accordingly.
  • intervals of time are schematically indicated at t in Figure 3 and can for example have a fixed duration of approx. 1 minute.
  • said intervals t can have a variable duration.
  • the programme sequence control unit of the machine can be easily set to switch off the heating of the air flow 18 by the electric heating element 7 in response to the above cited variation in the amount of water removed from the clothes been detected to decrease, during at least one of said pre-established periods of time t, below a pre-determined value.
  • the heating of the air flow 18 is interrupted (possibly with a certain delay, according to the final drying degree desired) when the steepness of the curve L decreases below a pre-determined value that is correlated to the desired drying degree of the clothes.
  • the heating of the air flow 18 is interrupted (possibly with a certain delay) when the curve Q slopes downwards below of a pre-determined threshold that is in correlation with the desired degree of dryness of the clothes. In the example illustrated in Figure 3, both such corresponding conditions occur during the time interval indicated at tx.
  • the variation in the amount of water being removed from the clothes is detected by measuring the level of the water collecting in the container 11 by means of the level or pressure switch 12 (or a similar level sensing device) which may be of either the analogue or the digital type.
  • a pressure switch appears to particularly fit the application, since it is capable of driving the programme sequence control unit of the machine with a signal that is indicative of the level reached by the water in the container 11 and, therefore, representative of the amount of water L removed from the clothes.
  • control method according to the present invention can be advantageously implemented in a clothes drying machine, or any similar apparatus, of a traditional type without implying any structural complication, while making use of component parts that already exist in the same machine.
  • the method according to the present invention turns out to be particularly accurate and substantially insensitive to noise, disturbances and tolerances of the system, as opposite to what actually occurs with prior-art conductometric-type systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP99120655A 1998-12-02 1999-10-19 Procédé pour contrôler la charge de linge à sécher dans un séche linge ou appareil similaire Withdrawn EP1006231A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN980087 1998-12-02
IT1998PN000087A IT1305556B1 (it) 1998-12-03 1998-12-03 Metodo per controllare l'asciugatura del carico inun'asciugabiancheria o simile

Publications (2)

Publication Number Publication Date
EP1006231A2 true EP1006231A2 (fr) 2000-06-07
EP1006231A3 EP1006231A3 (fr) 2001-10-31

Family

ID=11395445

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99120655A Withdrawn EP1006231A3 (fr) 1998-12-02 1999-10-19 Procédé pour contrôler la charge de linge à sécher dans un séche linge ou appareil similaire

Country Status (2)

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EP (1) EP1006231A3 (fr)
IT (1) IT1305556B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1674837A1 (fr) * 2004-12-23 2006-06-28 CANDY S.p.A. Sèche-linge
WO2006100335A1 (fr) * 2005-03-23 2006-09-28 Ibai, S.Coop. Armoire permettant de defroisser et de secher des vetements
EP1790769A1 (fr) * 2005-11-23 2007-05-30 Electrolux Home Products Corporation N.V. Sèche-linge à tambour et procédé pour contrôler celui-ci
DE102015201831A1 (de) * 2015-02-03 2016-08-04 BSH Hausgeräte GmbH Verfahren zur Ermittlung von Wäscheeigenschaften und hierfür geeigneter Kondensationstrockner
EP2630289A4 (fr) * 2010-10-19 2017-11-08 LG Electronics Inc. Machine à laver et son procédé de commande

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2232911B1 (de) * 1972-07-05 1973-09-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Waschetrockner mit im Trockenluft strom angeordneter Kondensations einrichtung
EP0481561A2 (fr) * 1990-10-18 1992-04-22 Whirlpool Europe B.V. Procédé et dispositif pour contrôler la phase de séchage dans un sèche-linge, une machine à laver ou similaire
DE4211012A1 (de) * 1992-04-02 1993-10-07 Bosch Siemens Hausgeraete Verfahren und Vorrichtung zum Steuern eines Trocknungsvorganges

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2232911B1 (de) * 1972-07-05 1973-09-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Waschetrockner mit im Trockenluft strom angeordneter Kondensations einrichtung
EP0481561A2 (fr) * 1990-10-18 1992-04-22 Whirlpool Europe B.V. Procédé et dispositif pour contrôler la phase de séchage dans un sèche-linge, une machine à laver ou similaire
DE4211012A1 (de) * 1992-04-02 1993-10-07 Bosch Siemens Hausgeraete Verfahren und Vorrichtung zum Steuern eines Trocknungsvorganges

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1674837A1 (fr) * 2004-12-23 2006-06-28 CANDY S.p.A. Sèche-linge
WO2006100335A1 (fr) * 2005-03-23 2006-09-28 Ibai, S.Coop. Armoire permettant de defroisser et de secher des vetements
ES2281239A1 (es) * 2005-03-23 2007-09-16 Ibai, S. Coop. Armario de desarrugado y secado de ropa.
EP1790769A1 (fr) * 2005-11-23 2007-05-30 Electrolux Home Products Corporation N.V. Sèche-linge à tambour et procédé pour contrôler celui-ci
WO2007059858A1 (fr) * 2005-11-23 2007-05-31 Electrolux Home Products Corporation N.V. Sèche-linge et procédé de commande pour celui-ci
EP2630289A4 (fr) * 2010-10-19 2017-11-08 LG Electronics Inc. Machine à laver et son procédé de commande
DE102015201831A1 (de) * 2015-02-03 2016-08-04 BSH Hausgeräte GmbH Verfahren zur Ermittlung von Wäscheeigenschaften und hierfür geeigneter Kondensationstrockner
WO2016124349A1 (fr) * 2015-02-03 2016-08-11 BSH Hausgeräte GmbH Procédé de détermination des propriétés de séchage et sèche-linge à condensation adapté à ce dernier
CN107208350A (zh) * 2015-02-03 2017-09-26 Bsh家用电器有限公司 用于求取洗涤物特性的方法和适用于此的冷凝干燥机
CN107208350B (zh) * 2015-02-03 2019-06-11 Bsh家用电器有限公司 用于求取洗涤物特性的方法和适用于此的冷凝干燥机

Also Published As

Publication number Publication date
EP1006231A3 (fr) 2001-10-31
IT1305556B1 (it) 2001-05-09
ITPN980087A1 (it) 2000-06-03

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