EP2610388A1 - Wäschetrockner und Steuerverfahren dafür - Google Patents

Wäschetrockner und Steuerverfahren dafür Download PDF

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Publication number
EP2610388A1
EP2610388A1 EP11195787.4A EP11195787A EP2610388A1 EP 2610388 A1 EP2610388 A1 EP 2610388A1 EP 11195787 A EP11195787 A EP 11195787A EP 2610388 A1 EP2610388 A1 EP 2610388A1
Authority
EP
European Patent Office
Prior art keywords
temperature
drum
drying
laundry
rotatable
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
EP11195787.4A
Other languages
English (en)
French (fr)
Other versions
EP2610388B1 (de
Inventor
Fabio Altinier
Daniele Beninato
Giorgio Coletto
Paolo Driussi
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 Home Products Corp NV
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Electrolux Home Products Corp NV
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Filing date
Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP11195787.4A priority Critical patent/EP2610388B1/de
Publication of EP2610388A1 publication Critical patent/EP2610388A1/de
Application granted granted Critical
Publication of EP2610388B1 publication Critical patent/EP2610388B1/de
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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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • 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
    • D06F2103/24—Spin speed; Drum movements
    • 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
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • 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
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 

Definitions

  • the present invention relates to a laundry drying machine and a method for controlling said machine.
  • the present invention further relates to a domestic rotatable drum laundry drying machine which may be embodied as a dryer able to dry clothes, or as a washer-dryer operable to wash and/or dry clothes.
  • Methods for controlling rotatable-drum laundry driers are known, in which: hot air is supplied into the rotating drum so as to flow over the laundry inside the drum; the impedance of the laundry is measured by measuring electrodes positioned inside the drum for contacting the laundry; the moisture of the laundry is determined on the basis of the impedance measurement; and the drying cycle is stopped when the impedance measurement reaches a time-constant comparison threshold associated to a predetermined final moisture.
  • control methods implemented in the washer-dryers are configured to determine the laundry moisture based on control signals available in the washer-dryer, for example temperatures of the airflow measured in some specific positions of the drying circuit, i.e. at the drum inlet and/or the condenser-input, etc.
  • Such control methods continuously measure air-temperatures and stops drying cycles when the air-temperature measurement reaches a threshold temperature associated to a predetermined final moisture.
  • control methods are, on the one hand, able to assure acceptable results in terms of drying level of the laundry, on the other hand, they are not enough accurate when a specific drying cycle needs to be performed, such as for example, a so called "iron drying cycle” requiring a high moisture precision because, at the end of the cycle, laundry should be sufficiently humid to facilitate a subsequent ironing.
  • a laundry drying machine as claimed in Claim 1 and preferably, though not necessarily, in any one of the Claims depending directly or indirectly on Claim 1.
  • a second aspect of the present invention provides a method to control a laundry drying machine as claimed in Claim 6 and preferably, though not necessarily, in any one of the Claims depending directly or indirectly on Claim 6.
  • a third aspect of the present invention provides an electronic control system configured to control a laundry drying machine as claimed in Claim 11 and preferably, though not necessarily, in any one of the Claims depending directly or indirectly on Claim 11.
  • referral number 1 indicates as a whole a laundry drying machine which may be embodied as a rotatable-drum laundry dryer, or as a rotatable drum laundry washer-dryer, to which the following description refers purely by way of example without implying any loss of generality.
  • rotatable-drum laundry drying machine 1 comprises an outer casing 2 that preferably rests on the floor on a number of feet.
  • Casing 2 supports a tub 29 that houses a rotatable laundry drum 3.
  • Drum 3 defines a washing/ drying chamber 4 for accommodating laundry 5 and rotates about a preferably, though not necessarily, horizontal axis of rotation 6.
  • axis of rotation 6 may be vertical or inclined.
  • Washing/drying chamber 4 has a front access opening 7 closable by a door 8 preferably hinged to casing 2.
  • a conduit 40 is provided for supplying water to a detergent dispenser unit 41 so as to form a washing liquor that is supplied to the chamber 4.
  • a draining conduit 42 is further provided for draining liquid from tub 29 by means of a pump 43.
  • Rotatable-drum 3 may be rotated about the axis of rotation 6 by an electric motor 9 (shown schematically in Figure 1 ) which is mechanically connected to the rotatable drum 3 through a drive member 10 for transmitting the motion for driving the rotatable-drum 3 in rotation about its axis 6.
  • an electric motor 9 shown schematically in Figure 1
  • a drive member 10 for transmitting the motion for driving the rotatable-drum 3 in rotation about its axis 6.
  • rotatable drum laundry drying machine 1 also comprises a hot-air generator 11 housed inside the casing 2, and designed to circulate through the rotatable-drum 3 a stream of hot air having a low moisture level, and which flows over and dries the laundry 5 inside the rotatable-drum drying chamber 4.
  • a hot-air generator 11 housed inside the casing 2, and designed to circulate through the rotatable-drum 3 a stream of hot air having a low moisture level, and which flows over and dries the laundry 5 inside the rotatable-drum drying chamber 4.
  • hot air generator 11 provides for gradually drawing air from rotatable-drum 3; extracting moisture from the air drawn from rotatable drum 3; heating the dehumidified air to a predetermined temperature based on the selected drying cycle; and supplying the heated, dehumidified air cyclically back into rotatable drum 3, where it flows over the laundry 5 inside the rotatable drum 3 to dry it.
  • hot air generator 11 is operable for continually dehumidifying and heating the air circulating inside rotatable drum 3 to dry the laundry 5 inside the drum 3/chamber 4, and substantially comprises:
  • heating device 15 may advantageously comprise a number of electric heating components, such as electric resistors located inside the air recirculating conduit 12 to dissipate electric power by Joule effect so as to heat the air supplied to rotatable-drum 3.
  • electric heating components such as electric resistors located inside the air recirculating conduit 12 to dissipate electric power by Joule effect so as to heat the air supplied to rotatable-drum 3.
  • condensing device 14 may comprise a water spraying nozzle 44 designed to condense the moisture in the airflow through the air recirculating conduit 12. It should be pointed out that condensing device 14 applies, purely by way of example, to one possible embodiment of the present invention, and may be omitted in the case of a vented type rotatable drum laundry drier 1 (i.e. a dryer in which the hot and moisture-laden drying air from the rotatable-drum 3 is expelled directly out of rotatable-drum laundry drier 1).
  • a vented type rotatable drum laundry drier 1 i.e. a dryer in which the hot and moisture-laden drying air from the rotatable-drum 3 is expelled directly out of rotatable-drum laundry drier 1).
  • heating device 15 and condensing device 14 may be replaced with two heat exchangers, i.e. a refrigerant fluid condenser and a refrigerant fluid evaporator respectively, comprised within a heat pump assembly (not shown).
  • the condensing device 14 may be an air/air heat exchanger, where drying air and ambient air taken from the machine outside are passed therethrough.
  • the air recirculating conduit 12 presents a first end 22 connected to the tub 29, through a first opening forming an input air-duct 23 of the tub 29.
  • the second end 24 of the air recirculating conduit 12 is connected to the tub 29 , through a second opening forming an output air duct 25 of the tub 29.
  • fan 13 blows a stream of drying air heated by heating device 15, to the input air-duct 23 of the tub 29.
  • the moisture-laden drying air flows out from rotatable drum 3 and tub 29, through the output air duct 25, and it is preferably directed to the condensing device 14, which cools the drying air to condense the moisture inside it.
  • Rotatable-drum laundry drying machine 1 further comprises an electronic control system 16 configured to control rotatable drum laundry drier 1 preferably on the basis of a drying cycle selected by a user through the control interface 18, according to the control method which will be hereinafter disclosed in detail.
  • the electronic control system 16 comprises a temperature sensing system which is configured to sense along the air recirculating conduit 12: the input-temperature TIN of the heated airflow which is supplied to the input air duct 23 of the tub 29; the inside-temperature T W of the heated airflow inside drum 3; and the output-temperature T OUT of the heated airflow which flows out of rotatable-drum 3 through the output air-duct 25 of the rotatable drum 3.
  • the temperature sensing system comprises a temperature sensor 26 arranged on input air duct 23 to sense the input-temperature TIN of the airflow which is supplied to rotatable drum 3; a temperature sensor 27 arranged inside the tub 29 to sense the inside temperature T W of the heated airflow inside the rotatable drum 3; and a temperature sensor 28 arranged on the output air-duct 25 to measure the output-temperature T OUT of the airflow which flows out from the rotatable drum 3 and the tub 29.
  • the position of the temperature sensor 27 is chosen so as to place the sensor in a stationary part of the machine, such part being sufficiently close to the rotatable drum 3 such that the temperature T W sensed by sensor 27 can be considered equal to that of the drying airflow inside the drum.
  • the temperature sensor 27 may be the same sensor that, during a washing process, senses the temperature of the washing liquor which is heated by a heating device 45 provided at the bottom of the tub 29.
  • the electronic control system 16 further comprises a sensing device 19 designed to output a signal S which is indicative of the torque value TE provided to the rotatable drum 3 by the electric motor 9, i.e. a signal which is indicative of the strength developed by the drum motor 9 to rotate the drum 3 itself during a laundry drying process.
  • signal S may be the motor torque TE itself or, for example, an electrical parameter such as the current (I) through the electric motor, the voltage (V) of the motor, the magnetic flux ( ⁇ ) in the electric motor and the like.
  • an electronic control unit 20 which is configured for: controlling the hot air generator 11 based on drying airflow input-temperature
  • the laundry moisture decreases gradually to reduce step by step the total weight of the wet clothes. Consequently, the loss in weight of the wet clothes affects directly the torque that electric motor 9 has to provide to the drum 3 to maintain a prefixed drum speed.
  • the sensed drying airflow output-temperature T OUT is substantially equal to the sensed inside-temperature T W of the drying airflow inside the drum 3, but when moisture of the clothes becomes smaller of a threshold value, the temperature-difference ⁇ T between the output-temperature T OUT and inside-temperature T W start to gradually increase. In other words, the instant in which temperature-difference ⁇ T starts to increase is indicative of the fact that laundry-moisture has reached a determined value.
  • Applicant found out that it is possible to improve accuracy of determining a given laundry moisture associated to a final drying condition and determining end of drying cycle, by using and comparing to each other the information about sensed torque and the information related to temperature-difference ⁇ T between the measured output-temperature T OUT and the measured inside-temperature T W . It should also be pointed out that even if in Figure 3 it has been represented the drum motor torque on drying process time, other parameters indicative of the torque supplied by the drum motor, such as the current (I) through the electric motor, the voltage (V) of the motor, or the magnetic flux ( ⁇ ) in the electric motor, could be sensed by the sensing device 19 to obtain a graph similar to that of the torque shown in Figure 3 .
  • a signal S indicative of the torque supplied by the drum motor 9 such as the current (I) through the electric motor, the voltage (V) of the motor, the magnetic flux ( ⁇ ) in the electric motor and the like.
  • the sensed signal S is transformed by a mathematical function F(S), preferably, although not necessarily, a linear function, in the comparison threshold THC, which is used to determine the temperature-difference ⁇ T related to a desired laundry moisture at the end of a drying process.
  • F(S) preferably, although not necessarily, a linear function
  • Figure 3 shows, as an example, some experimental data measured by Applicant during experimental test, wherein it is shown: how output-temperature T OUT and inside-temperature T W increase during the drying cycle and start diverging to each other when the residual laundry moisture within laundry is lower than 10% (temperature-graph 30); how torque TE provided by the electric motor 9 to the drum 3 decreases during drying cycles (torque-graph 31); how comparison threshold THC determined by linear function and associated to the measured torque TE, decreases and crosses the temperature-difference ⁇ T in a crossing point associated to the predetermined moisture value, i.e. less than 10% (threshold-graph 33).
  • experimental values A and B may be determined by performing several drying tests based on drying cycle implementable by a laundry drying machine, in which during each test, torque, or, more generally, a signal S indicative of the drum motor torque, temperature-difference ⁇ T, and moisture of the laundry are measured. Values A and B are determined/dimensioned so that the crossing point between comparison threshold THC curve and the temperature-difference ⁇ T curve occurs at a predetermined laundry moisture.
  • values A and B may be determined and stored in a database contained in the electronic control system 16 and vary according to the selected drying cycle and/or several drying parameters such as: kind of laundry, and/or weight/quantity of laundry, and/or required laundry moisture at the end of a drying process.
  • Figure 4 shows a flow chart of the operating-phases performed by the electronic control system 16 when carries out a control method according to a preferred embodiment of the present invention.
  • electronic control unit 20 starts the drying cycle (Block 100) based on the cycle selection made by a user through the user control interface 18.
  • the electronic control unit 20 controls the electric motor 9 to cause the drum 3 to rotate at pre-set rotation speeds about the axis of rotation 6 according to the drying cycle and switches-on the hot-air generator 11 to start dehumidifying and heating the air circulating inside rotatable-drum 3 to dry the laundry 5 inside the drum 3/chamber 4 (Block 110).
  • the electronic control unit 20 acquires the input-temperature TIN sensed by means of temperature sensor 26, and controls the heating device 15 and/or the fan 13 to supply drying air into the rotatable-drum 3 (Block 120) so that the airflow temperature supplied to the rotatable-drum 3 is controlled according to the difference between the measured input-temperature TIN and a reference temperature associated to the performed drying cycle.
  • the electronic control unit 20 controls the heating device 15 and the fan 13 so that the input-temperature TIN is maintained substantially equal to a predetermined value associated to the performed drying cycle.
  • method to control the airflow temperature performed by the electronic control unit 20 may correspond to any known temperature control method, and being not the object of the present invention, it will not be further disclosed.
  • electronic control unit 20 receives a signal S indicative of the drum motor torque TE from the sensing device 19 (Block 130).
  • the electronic control unit 20 retrieves linear parameters A and B from a database contained in the electronic control system 16 based on: selected drying cycle and/or several drying parameters such as kind of laundry, and/or weight/quantity of laundry, and/or required laundry moisture at the end of the drying cycle.
  • Electronic control unit 20 determines the temperature-difference ⁇ T between the sensed output-temperature T OUT and sensed inside-temperature T W (Block160), and compares temperature-difference ⁇ T with the comparison threshold THC associated to the signal S (Block 170).
  • Electronic control unit 20 checks instant by instant, (for example, every a second), whether the temperature-difference ⁇ T is greater than the comparison threshold THC associated to a required laundry moisture at the end of the drying cycle (Block 170), and if not (NO output from Block 170), it performs next step of computation (Block 180) and repeats operating-phases disclosed from Block 130 to Block 170, so as to acquire the signal S from the sensing device 19; acquire the inside-temperature T W and the output-temperature T OUT ; determine the comparison threshold THC based on sensed, and compare temperature-difference ⁇ T with the comparison threshold THC.
  • the electronic control unit 20 determines that laundry moisture has reached the desired final moisture that has been linked to the threshold value THC, stops the drying cycle (Block 190), and preferably, though not necessarily, starts a laundry cooling stage (Block 200).
  • Stopping the drying cycle may preferably comprise turning off heating device 15.
  • the purpose of the cooling stage is to lower the high temperature (e.g. 70°C) of the laundry 5 to a predetermined low temperature (e.g. 50°C) at which laundry 5 can be handled by the user.
  • rotatable-drum 3 may be kept turning, and non-heated air supplied into rotatable drum 3.
  • Rotatable-drum laundry drier 1 has the major advantages of ensuring a accurate desired laundry moisture at the end of a drying cycle for a wide range of drying cycles and ensuring the drying of different load quantity.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP11195787.4A 2011-12-27 2011-12-27 Wäschetrockner und Steuerverfahren dafür Active EP2610388B1 (de)

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Application Number Priority Date Filing Date Title
EP11195787.4A EP2610388B1 (de) 2011-12-27 2011-12-27 Wäschetrockner und Steuerverfahren dafür

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EP11195787.4A EP2610388B1 (de) 2011-12-27 2011-12-27 Wäschetrockner und Steuerverfahren dafür

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EP2610388A1 true EP2610388A1 (de) 2013-07-03
EP2610388B1 EP2610388B1 (de) 2016-03-16

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2927367A1 (de) * 2014-03-31 2015-10-07 Electrolux Appliances Aktiebolag Verfahren zum Durchführen eines Trocknungszyklus in einer Wäschebehandlungsmaschine, Wäschebehandlungsvorrichtung und elektronische Steuereinheit
US10087570B2 (en) 2014-04-16 2018-10-02 Mabe, S.A. De C.V. Intelligent electronic system for previously sensing the dryness condition of a textile clothes load in an automatic electronic clothes dryer machine
EP3597815A1 (de) * 2018-07-19 2020-01-22 Electrolux Appliances Aktiebolag Verfahren zur steuerung eines wäschetrockners

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5544428A (en) * 1994-04-27 1996-08-13 Sanyo Electric Co., Ltd. Clothes drier with drying termination determining function
US20100205823A1 (en) * 2009-02-19 2010-08-19 Whirlpool Corporation Laundry treating appliance with fluffing-state-based imaging control
EP2281935A1 (de) * 2009-08-07 2011-02-09 BSH Bosch und Siemens Hausgeräte GmbH Wäschebehandlungsgerät mit einem Elektromotor
WO2011045915A1 (ja) * 2009-10-16 2011-04-21 パナソニック株式会社 衣類乾燥機および洗濯乾燥機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5544428A (en) * 1994-04-27 1996-08-13 Sanyo Electric Co., Ltd. Clothes drier with drying termination determining function
US20100205823A1 (en) * 2009-02-19 2010-08-19 Whirlpool Corporation Laundry treating appliance with fluffing-state-based imaging control
EP2281935A1 (de) * 2009-08-07 2011-02-09 BSH Bosch und Siemens Hausgeräte GmbH Wäschebehandlungsgerät mit einem Elektromotor
WO2011045915A1 (ja) * 2009-10-16 2011-04-21 パナソニック株式会社 衣類乾燥機および洗濯乾燥機
US20120167636A1 (en) * 2009-10-16 2012-07-05 Panasonic Corporation Laundry dryer and washer dryer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2927367A1 (de) * 2014-03-31 2015-10-07 Electrolux Appliances Aktiebolag Verfahren zum Durchführen eines Trocknungszyklus in einer Wäschebehandlungsmaschine, Wäschebehandlungsvorrichtung und elektronische Steuereinheit
US10087570B2 (en) 2014-04-16 2018-10-02 Mabe, S.A. De C.V. Intelligent electronic system for previously sensing the dryness condition of a textile clothes load in an automatic electronic clothes dryer machine
EP3597815A1 (de) * 2018-07-19 2020-01-22 Electrolux Appliances Aktiebolag Verfahren zur steuerung eines wäschetrockners
US10995449B2 (en) 2018-07-19 2021-05-04 Electrolux Appliances Aktiebolag Method for controlling a laundry drying machine

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