EP2604751A1 - Machine de séchage du linge et procédé de commande correspondant - Google Patents

Machine de séchage du linge et procédé de commande correspondant Download PDF

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Publication number
EP2604751A1
EP2604751A1 EP11193387.5A EP11193387A EP2604751A1 EP 2604751 A1 EP2604751 A1 EP 2604751A1 EP 11193387 A EP11193387 A EP 11193387A EP 2604751 A1 EP2604751 A1 EP 2604751A1
Authority
EP
European Patent Office
Prior art keywords
drum
laundry
electric motor
drying cycle
electronic control
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Withdrawn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
EP11193387.5A
Other languages
German (de)
English (en)
Inventor
Fabio Altinier
Giorgio Coletto
Paolo Driussi
Daniele Beninato
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
Original Assignee
Electrolux Home Products Corp NV
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 Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP11193387.5A priority Critical patent/EP2604751A1/fr
Publication of EP2604751A1 publication Critical patent/EP2604751A1/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Withdrawn legal-status Critical Current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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/34—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
    • D06F2103/44—Current or voltage
    • 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
    • D06F2103/44—Current or voltage
    • D06F2103/46—Current or voltage of the motor driving the drum
    • 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
    • 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
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • 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
    • D06F2105/62—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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof

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 configured to wash and 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 with a predetermined final moisture.
  • control methods implemented in the washer-dryer 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 inlet, etc.
  • Such control methods continuously measure air-temperatures and stops drying cycles when the air temperature measurement reaches a threshold temperature associated with 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 5 and preferably, though not necessarily, in any one of the Claims depending directly or indirectly on Claim 5.
  • a third aspect of the present invention provides an electronic control system to control a laundry drying machine as claimed in Claim 9 and preferably, though not necessarily, in any one of the Claims depending directly or indirectly on Claim 9.
  • 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.
  • 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 rotatable laundry drum 3, which 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.
  • 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 drier 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 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 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, normally higher than the temperature of the air exiting from the rotatable drum 3; 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 provides 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 (not shown) 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 (not shown) 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 heat-exchanger 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).
  • two heat exchangers i.e. a refrigerant fluid condenser and a refrigerant fluid evaporator respectively, comprised within a heat pump assembly (not shown).
  • fan 13 blows a stream of drying air, heated by heating device 15 into rotatable drum 3. After contacting laundry 5 inside drum 3, the moisture-laden drying air flows out of rotatable-drum 3 and it is preferably directed to the moisture condensing device 14, which cools the drying air to condense the moisture inside it.
  • Rotatable drum laundry drier 1 also comprises an electronic control system 16 configured to control rotatable drum laundry drier 1 preferably on the basis of a drying cycle user-selected through a user control interface 18, according to the control method which will be hereinafter disclosed in detail.
  • the electronic control system 16 comprises a sensing device 19 which outputs 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 effort made 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.
  • the electronic control system 16 further comprises an electronic control unit 20 which is configured for: receiving the signal indicative of the torque value TE, comparing such signal S with a prefixed comparison signal value THR associated to a determined laundry moisture corresponding to a desired final moisture, and stopping the drying cycle on the basis of the result of such comparison.
  • the electronic control unit 20 is configured to stop the drying cycle when the signal S value reaches a value which is lower than, or equal to, a prefixed comparison signal value THR.
  • Figure 2 shows, as an example, some experimental data measured by Applicant during experimental test, wherein it is shown how torque TE provided by the electric motor 9 to the drum 3 decreases during a drying cycle for different laundry loads, i.e. a first laundry load associated to a low weight laundry load (indicated “L1” in Fig 2 ), a second medium weight laundry load associated to a load weighing about half of the maximum load accepted by the drum chamber 4(indicated "L2" in Figure 2 ), and, a third high weight laundry load associated to about the maximum load accepted by the drum chamber 4 (indicated "L3" in Figure 2 ).
  • TRR threshold value
  • Figure 2 refers to experimental data retrieved by carrying out a laundry drying process through a washer-drier, wherein it can be seen that the same comparison torque value THR for three different laundry load L1, L2 and L3, corresponds substantially to the same final laundry moisture values DFM (Desired Final Moisture).
  • THR threshold
  • a set of threshold values corresponding to the user selectable drying programs is therefore stored in a memory support accessible to the electronic control unit 20.
  • Figure 3 shows a flow chart of the operating phases performed by the electronic control system 16 when it carries out the control method according to the present invention.
  • electronic control unit 20 starts a drying cycle selected by a user through the user control interface 18 (Block 100).
  • 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 which user has selected.
  • the electronic control unit 20 switches-on the heating device 15 and controls the fan 13 to supply drying air into the rotatable-drum 3 (Block 110).
  • electronic control unit 20 receives from the sensing device 19 a signal S indicative of the torque provided to the rotatable-drum 3 by the electric motor 9 (Block 120).
  • Electronic control unit 20 checks instant by instant, (for example, every a second), whether the signal value S is lower than, or equal to, the prefixed comparison signal value THR associated to the determined laundry moisture corresponding to a desired final moisture (DFM) (Block 130), and if not (NO output from Block 130), it repeats operating-phases disclosed in Blocks 120 and 130 namely, receives from the sensing device 19 a new signal which is indicative of the torque provided to the rotatable drum 3 by the electric motor 9 in a next measuring instant, and performs comparisons between the last detected signal S and the prefixed comparison torque value THR.
  • DFM final moisture
  • electronic control unit 20 determines that laundry moisture has reached the desired final moisture DFM, stops the drying cycle (Block 140), and preferably, though not necessarily, starts a laundry cooling stage (Block 150).
  • comparison signal value THR can be selected for any drying cycle and that different final moisture (DFM) of the laundry 5 (dryness laundry level) can be advantageously obtained depending on the kind of drying cycle.
  • "cupboard-drying cycle” may preferably be configured to have a specific comparison signal value THR associated with a desired dryness laundry level, which is different to the comparison signal value THR and dryness laundry level of a iron-drying cycle or a damp-drying cycle.
  • the sensing device 19 may be adapted to sense one or more electric parameters of the drum motor 9, such as the current (I), the voltage (V), the magnetic flux ( ⁇ ) and the like, or it may be provided with a torque meter so as to provide directly a signal of torque as output.
  • the electronic control unit 20 may be programmed, i.e. configured, to receive one or more of the above mentioned signals from the sensing device 19 and, if necessary, elaborate them so as to make such signals comparable with the comparison signal values THR stored in a memory support accessible to the electronic control unit 20, so as to carry out the control method disclosed above.
  • 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 fed into rotatable drum 3.
  • Rotatable-drum laundry drier 1 has the major advantages of ensuring an accurate desired final moisture for a wide range of drying cycles; ensuring the drying of different load quantity; being suitable to be performed for different kind of laundry textile, i.e. cotton synthetic etc.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP11193387.5A 2011-12-14 2011-12-14 Machine de séchage du linge et procédé de commande correspondant Withdrawn EP2604751A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11193387.5A EP2604751A1 (fr) 2011-12-14 2011-12-14 Machine de séchage du linge et procédé de commande correspondant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11193387.5A EP2604751A1 (fr) 2011-12-14 2011-12-14 Machine de séchage du linge et procédé de commande correspondant

Publications (1)

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EP2604751A1 true EP2604751A1 (fr) 2013-06-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3348694A1 (fr) * 2017-01-17 2018-07-18 Electrolux Appliances Aktiebolag Procédé de commande d'un appareil de blanchisserie

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481786A (en) * 1982-06-04 1984-11-13 Whirlpool Corporation Electronic control for a domestic appliance
EP0143685A1 (fr) * 1983-10-25 1985-06-05 Esswein S.A. Procédé de détermination d'une charge de linge dans un tambour tournant, et machine à laver et/ou à sécher mettant en oeuvre ce procédé
EP0436375A2 (fr) * 1990-01-02 1991-07-10 Whirlpool Corporation Diagnostic moteur et régulation électronique pour un sèche-linge
EP1609901A1 (fr) * 2004-06-24 2005-12-28 Electrolux Home Products Corporation N.V. Machine à laver domestique avec essorage amélioré

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481786A (en) * 1982-06-04 1984-11-13 Whirlpool Corporation Electronic control for a domestic appliance
EP0143685A1 (fr) * 1983-10-25 1985-06-05 Esswein S.A. Procédé de détermination d'une charge de linge dans un tambour tournant, et machine à laver et/ou à sécher mettant en oeuvre ce procédé
EP0436375A2 (fr) * 1990-01-02 1991-07-10 Whirlpool Corporation Diagnostic moteur et régulation électronique pour un sèche-linge
EP1609901A1 (fr) * 2004-06-24 2005-12-28 Electrolux Home Products Corporation N.V. Machine à laver domestique avec essorage amélioré

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3348694A1 (fr) * 2017-01-17 2018-07-18 Electrolux Appliances Aktiebolag Procédé de commande d'un appareil de blanchisserie

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