EP2599913A1 - System zur Bestimmung der Dauer eines Trocknungszyklus in einem Wäschetrockner mit Drehtrommel - Google Patents

System zur Bestimmung der Dauer eines Trocknungszyklus in einem Wäschetrockner mit Drehtrommel Download PDF

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Publication number
EP2599913A1
EP2599913A1 EP11191247.3A EP11191247A EP2599913A1 EP 2599913 A1 EP2599913 A1 EP 2599913A1 EP 11191247 A EP11191247 A EP 11191247A EP 2599913 A1 EP2599913 A1 EP 2599913A1
Authority
EP
European Patent Office
Prior art keywords
drying cycle
tde
drum
duration
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.)
Withdrawn
Application number
EP11191247.3A
Other languages
English (en)
French (fr)
Inventor
Fabio Altinier
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 EP11191247.3A priority Critical patent/EP2599913A1/de
Publication of EP2599913A1 publication Critical patent/EP2599913A1/de
Withdrawn legal-status Critical Current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
    • D06F58/46—Control of the operating time
    • 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
    • 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
    • D06F2103/38—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
    • D06F2103/44—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
    • 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
    • D06F2105/56—Remaining operation time; Remaining operational cycles
    • 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
    • D06F2105/58—Indications or alarms to the control system or to the user
    • 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
    • D06F34/28—Arrangements for program selection, e.g. control panels therefor; Arrangements for indicating program parameters, e.g. the selected program or its progress
    • 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 system to determine the duration of a drying cycle in a rotatable-drum laundry dryer.
  • the present invention relates to a system calculating an estimated duration, i.e. an estimated end of cycle time of a drying cycle performed by means of a rotatable-drum laundry drying machine or by a washer-dryer configured to wash and dry clothes, to which the following description refers purely by way of example without implying any loss of generality.
  • a substantially parallelepiped-shaped, boxlike outer casing structured for resting on the floor
  • a substantially cylindrical revolving drum which is structured for housing the laundry to be washed/dried and is housed in axially rotating manner inside the casing to rotate about a longitudinal reference axis, directly facing a laundry loading/unloading opening formed in the front wall of the casing
  • a porthole door hinged to the front wall of the casing to rotate to and from a closing position in which the door rests completely against the front wall of the casing to close the laundry loading/unloading opening and airtight seal the revolving drum
  • an electrically-powered motor assembly which is housed inside the casing and is structured for driving into rotation the revolving drum about its longitudinal reference axis during washing/drying cycles
  • a drying circuit which is housed inside the casing and is structured to circulate inside the revolving drum a stream of hot air which has a very low moisture content
  • the electronic control system of the washer-dryer of the kind above disclosed is usually configured to detect some specific drying conditions based on several control parameters measured during the drying cycle, namely laundry moisture, and determines the end of cycle time, when said specific drying conditions are met, for example when the laundry moisture, measured through a couple of conductimetric sensors, reaches a prefixed moisture threshold stored in the control system memory.
  • An aim of the present invention is to provide an extremely simple system able to calculate/estimate the drying cycle duration at the beginning of drying cycle in order to determine the end of drying cycle time.
  • an electronic control system and a method configured to calculate an estimated duration of a drying cycle performed by a rotatable-drum drier comprising a casing and a rotatable drum structured for housing the laundry to be dried and is fixed in axially rotating manner inside the casing; wherein the system/method is configured to measure at least a parameter in said rotatable-drum drier, which is indicative of the moment of inertia of the laundry loaded in the drum; and estimate the duration of a drying cycle based on the calculated moment of inertia of the laundry loaded in the drum.
  • the electronic control system/method is configured to measure said parameter in the rotatable-drum drier which is indicative of the moment of inertia of the laundry loaded in the drum at the beginning of the drying cycle to be performed, i.e. in the very first period of a drying cycle.
  • the electronic control system/method is configured to stop the drying cycle after estimated duration.
  • referral number 1 indicates as a whole a laundry dryer corresponding to a rotatable-drum laundry dryer or a rotatable-drum laundry washer-dryer.
  • rotatable-drum laundry dryer 1 comprises an outer casing 2 that preferably rests on the floor on a number of feet.
  • a rotatable laundry drum 3 is mounted within the casing 2 and the drum 3 defines a washing/ drying chamber 4 for laundry 5 and rotates about a preferably, though not necessarily, horizontal axis of rotation 6. (In an alternative embodiment not shown, 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.
  • Drum 3 may be rotated about axis of rotation 6 by an electric motor 9 (shown schematically in Figure 1 ), and is fed with hot air heated by a heating device 10 and supplied into drum 3 preferably by a fan 11.
  • Fan 11 may preferably, though not necessarily, be driven by the electric motor 9 or, in an alternative embodiment (not shown), by an auxiliary electric motor (not shown) independent of electric motor 9.
  • Heating device 10 may advantageously comprise one or more electric heating components, such as electric resistors (not shown), or in an alternative embodiment a refrigerant fluid condensing element of a heat pump circuit.
  • fan 11 blows into the drum 3 a stream of drying air, heated by heating device 10 into drum 3.
  • the moisture-laden drying air flows out of drum 3 and it is preferably directed to a moisture condensing device 14, which cools the drying air to condense the moisture inside it.
  • condensing device 14 may be an air/air heat exchanger supplied with cold air taken from outside the drier or a refrigerant fluid evaporating element of a heat pump circuit. After being passed through the moisture condensing device 14, the moisture-free air is led again towards the drum 3 by fan 11 to pass cyclically inside the chamber 4.
  • condensing device 14 as described above 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 laundry 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 laundry drum 3 is expelled directly out of rotatable-drum laundry drier 1).
  • Rotatable-drum laundry drier 1 also comprises an electronic control system 12 configured to control rotatable-drum laundry drier 1 preferably on the basis of a drying cycle user-selected by using a user control interface 13.
  • the electronic control system 12 is configured to estimate, after a user-selected drying cycle has begun running, a duration of the drying cycle, and preferably, though not necessarily calculate the end of cycle time based on the estimated duration.
  • the electronic control system 12 determines the moment of inertia JE of the "rotating load" of the drier 1, which is associated to the mass of the rotatable laundry drum 3 plus the mass of the laundry 5 housed inside the rotatable laundry drum 3.
  • the electronic control system 12 performs a "starting drying phase", wherein the drum is conveniently rotated to cause the laundry load to be uniformly arranged on the cylindrical inner wall of the drum 3.
  • starting drying phase wherein the drum is conveniently rotated to cause the laundry load to be uniformly arranged on the cylindrical inner wall of the drum 3.
  • the electronic control system 12 determines the moment of inertia JE of the rotating load of the drier 1.
  • the electronic control system 12 measures one or more parameters associated with the moment of inertia JE of the "rotating load" of the drier 1, and calculate the moment of inertia JE based on measured parameters according to known inertia calculating method.
  • electronic control system 12 may be configured to calculate the moment of inertia JE of the rotating load of the drier 1 according to the method disclosed in EP 2107151 A1 filed by the Applicant, wherein the measured parameters used to calculate the moment of inertia JE are the torque values provided to the rotatable drum 3 by the electric motor 9 and/or the drum speed.
  • moment of inertia JE may be calculated by implementing any other kind of known inertia calculating method.
  • electronic control system 12 may be configured to determine the moment of inertia JE based on one or more electrical parameters of the electrical motor 9, which may be measured during the starting phase of the drying cycle by means of appropriate sensors.
  • the electronic control system 12 is further configured to determine/estimate the cycle duration TDE, i.e. the cycling time of the drying cycle based on the moment of inertia JE calculated at the starting phase of the drying cycle, i.e. at the first instants of time after the motor has begun to rotate the drum 3.
  • TDE cycle duration
  • the electronic control system 12 is further configured to determine/estimate the cycle duration TDE, i.e. the cycling time of the drying cycle based on the moment of inertia JE calculated at the starting phase of the drying cycle, i.e. at the first instants of time after the motor has begun to rotate the drum 3.
  • FIG. 2 shown, as an example, some experimental data measured by Applicant during experimental test, wherein it is shown that cycle time, namely the duration of a cotton drying cycle TDE (axis Y) to dry a cotton-laundry-load having a prefixed beginning moisture, is substantially a linear function of the moment of inertia JE (axis X).
  • a and B are experimental values, i.e. linear parameters, associated with the drier 1 architecture, that is the dryer geometry and mass distribution of mechanical operation devices to drive the drum 3, and further associated to laundry load characteristics like the fiber type, the drying cycle profile (i.e. temperature profile, air flow rate, and so on) and the drying circuit design (sections area, circuit
  • Said A and B experimental values may be associated with respective drying cycle and be stored in a database of the electronic control system 12.
  • linear parameters A and B characterizing the above linear equation used to estimate the time to end TDE may change their values according to the selected drying cycle.
  • the linear parameters A and B can be estimated experimentally through laboratory tests in which there are measured the real end of the drying cycle time TDE of a specific kind of drying cycle in pre-set starting drying conditions such as: predetermined kind of laundry load (i.e. cotton, synthetic fibers), predetermined weight of laundry moisture/load (and, as a consequences, pre-set starting moment of inertia JE).
  • pre-set starting drying conditions such as: predetermined kind of laundry load (i.e. cotton, synthetic fibers), predetermined weight of laundry moisture/load (and, as a consequences, pre-set starting moment of inertia JE).
  • the calibration of the parameters A end B may be done, for example, by collecting data with different kinds of laundry loads (starting from the minimum up to the maximum load) and performing several test cycles with the specific drying program selected for the drier machine under analysis.
  • the least-squares method is a known optimization technique, which enables a linear combination of specific functions to be found that, by means of linear parameters, approaches as closely as possible an interpolation of a set of data, which, in this case, are constituted by the duration of the drying cycle measured at the various laundry-load/moment of inertia JE.
  • Figure 3 shows a flow chart of the operating-phases performed to a preferable control method implemented by electronic control system 12 to control rotatable-drum laundry drier 1 and determine/estimate the duration TDE of the drying cycle.
  • the electronic control system 12 provides the linear parameters A and B to be used for estimating the duration TDE of the drying cycle, such parameters A, B are taken from those stored in a database of the electronic control system 12, based on the selected drying cycle. Then the electronic control system 12 performs the starting drying phase of the drying cycle, wherein the drum 3 is conveniently rotated to cause the laundry load 5, and consequently the moisture, to be uniformly distributed among laundry in the drum 3. In such starting drying phase of the drying cycle, the electronic control system 12 determines/measures the moment of inertia JE (Block 100) of the load of the drier 1.
  • electronic control system 12 may measure some parameters associated with the drier load, i.e. the torque provided to the rotatable drum 3 and/or the drum speed, and calculate the moment of inertia JE according to the measured torque/speed.
  • the electronic control system 12 starts the drying cycle.
  • the electronic control system 12 switches-on the heating device 10, controls the fan 11 to feed drying air into the rotatable drum 3 and, at the same time, 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 selected drying cycle.
  • the electronic control system 12 detect that laundry is dried, interrupts the drying cycle (Block 180) and starts a laundry cooling stage (Block 190).
  • Stopping the drying cycle may preferably comprise turning off heating device 10.
  • the purpose of the cooling stage is to lower the high temperature (e.g. 70°C) of the laundry to a predetermined low temperature (e.g. 50°C) at which laundry 5 can be handled by the user.
  • drum 3 may be kept turning, and non-heated air fed into drum 3.
  • the electronic control system 12 may repeat one or more time, the estimation of the duration of drying cycle TDE as above disclosed (Blocks 100 and 110) and updating the remaining cycle time to be shown through the user control interface 13.
  • the electronic control system 12 may be configured to estimate the duration of the drying cycle TDE by implementing operations above disclosed (Blocks 100 and 110), and calculate and show to the user the remaining cycle time/estimated duration at any instant of the drying cycle, in response, for example, to an user command supplied to the electronic control system 12 by means of the user control interface 13.
  • the estimation of the duration of the drying cycle TDE may be performed during the starting phase as above disclosed, and/or one or more times during the subsequent drying cycle to advantageously provide, at any new estimation phase, a more accurate remaining cycle time to the user. This allows to avoid the unpleasant situation for a user, expecting to have his/her selected drying cycle ended when the user interface shows a cycle time duration equal to zero, to see that the cycle continues running over the estimated time because moisture in the laundry load is detected as still too high to stop the drying process.
  • the estimated drying cycle TDE information may be used only to inform the user about the remaining cycle time and not as control variable for interrupting the drying cycle.
  • the electronic control systems may be configured to: estimate the cycle duration TDE by means of linear function a) on the basis of calculated/determined moment of inertia JE; determine remaining cycle time based on estimated cycle duration TDE; communicate the estimated cycle duration TDE and/or the remaining cycle time to the user; stop the drying cycle when specific drying conditions are met, for example when the measured laundry moisture reaches a prefixed moisture threshold.
  • Rotatable-drum laundry drier 1 has the major advantages of:

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP11191247.3A 2011-11-30 2011-11-30 System zur Bestimmung der Dauer eines Trocknungszyklus in einem Wäschetrockner mit Drehtrommel Withdrawn EP2599913A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11191247.3A EP2599913A1 (de) 2011-11-30 2011-11-30 System zur Bestimmung der Dauer eines Trocknungszyklus in einem Wäschetrockner mit Drehtrommel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11191247.3A EP2599913A1 (de) 2011-11-30 2011-11-30 System zur Bestimmung der Dauer eines Trocknungszyklus in einem Wäschetrockner mit Drehtrommel

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020259848A1 (en) * 2019-06-28 2020-12-30 Electrolux Appliances Aktiebolag Laundry drying machine and control method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741182A (en) * 1983-10-25 1988-05-03 Esswein S.A. Washing and/or drying machine having means for determining a load of clothes in a rotary drum
US5507055A (en) * 1993-10-25 1996-04-16 Bosch-Siemens Hausgeraete Gmbh Method for determining the amount of lanudry in a laundry handling machine
EP1512785A1 (de) * 2003-09-04 2005-03-09 Lg Electronics Inc. Verfahren zur Erfassung der Wäschemenge einer Waschmaschine
EP2107151A1 (de) 2008-03-31 2009-10-07 Electrolux Home Products Corporation N.V. Verfahren zum Einschätzen des Trägheitsmoments einer Dreheinheit einer Waschmaschine und Waschmaschine, die dieses Verfahren umsetzt
EP2221412A1 (de) * 2009-02-24 2010-08-25 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Überwachen einer Beladung einer Wäschetrommel und/oder eines Trocknungsgrades von Wäschestücken und entsprechende Schaltungsanordnung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741182A (en) * 1983-10-25 1988-05-03 Esswein S.A. Washing and/or drying machine having means for determining a load of clothes in a rotary drum
US5507055A (en) * 1993-10-25 1996-04-16 Bosch-Siemens Hausgeraete Gmbh Method for determining the amount of lanudry in a laundry handling machine
EP1512785A1 (de) * 2003-09-04 2005-03-09 Lg Electronics Inc. Verfahren zur Erfassung der Wäschemenge einer Waschmaschine
EP2107151A1 (de) 2008-03-31 2009-10-07 Electrolux Home Products Corporation N.V. Verfahren zum Einschätzen des Trägheitsmoments einer Dreheinheit einer Waschmaschine und Waschmaschine, die dieses Verfahren umsetzt
EP2221412A1 (de) * 2009-02-24 2010-08-25 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Überwachen einer Beladung einer Wäschetrommel und/oder eines Trocknungsgrades von Wäschestücken und entsprechende Schaltungsanordnung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020259848A1 (en) * 2019-06-28 2020-12-30 Electrolux Appliances Aktiebolag Laundry drying machine and control method thereof

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