EP2034086B1 - Sèche-linge domestique avec une fin de cycle améliorée - Google Patents

Sèche-linge domestique avec une fin de cycle améliorée Download PDF

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Publication number
EP2034086B1
EP2034086B1 EP07115705A EP07115705A EP2034086B1 EP 2034086 B1 EP2034086 B1 EP 2034086B1 EP 07115705 A EP07115705 A EP 07115705A EP 07115705 A EP07115705 A EP 07115705A EP 2034086 B1 EP2034086 B1 EP 2034086B1
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EP
European Patent Office
Prior art keywords
value
drying
control procedure
drying cycle
airflow
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.)
Expired - Fee Related
Application number
EP07115705A
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German (de)
English (en)
Other versions
EP2034086A1 (fr
Inventor
Francesco Jatta
Davide Colombo
Enrico Bellinetto
Ralf Haselmeier
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
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Whirlpool Corp
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Publication date
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Priority to EP07115705A priority Critical patent/EP2034086B1/fr
Publication of EP2034086A1 publication Critical patent/EP2034086A1/fr
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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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/26—Condition of the drying air, e.g. air humidity or 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
    • 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
    • D06F2103/32—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
    • 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 the field of household tumble dryers of the vented type or the condensing type. More particularly, the present invention concerns a drying cycle control procedure for a household tumble dryer.
  • Household tumble dryers are quite popular nowadays.
  • these appliances generally comprise a rotatable drum, which defines an interior drying volume for receiving a wash load to be dried.
  • the rotatable drum is actuated by an electric motor, so as to tumble the wash load during the drying operation of the dryer.
  • the airflow follows a closed path that is fully inside the appliance. After being heated, the airflow passes through the drying volume. The humid exhaust air is then circulated to a condenser for dehumidification and it is again conveyed to the heating element for being heated again.
  • Traditional dryers generally comprise a control unit, which executes a drying cycle control procedure for properly managing the drying cycle, i.e. the sequence of operations needed for drying the wash load, (see for example ( EP-A-1420104 ).
  • Said control procedure may comprise some non-critical steps, such those of sending appropriate command signals to the heating element and the actuating elements of the dryer.
  • control strategy that is chosen for terminating the drying cycle, in other words, by the information and the criteria that are used to decide the termination of the drying cycle.
  • control unit merely terminates the operating drying cycle as soon as a predetermined and selectable drying interval elapses.
  • Other known dryers comprise strips of moisture or resistive sensors, which may be placed at the drum internal surface to detect the level of humidity of the wash load.
  • the control unit stops the operating drying cycle as soon as the humidity level is lower than a predefined threshold.
  • the mentioned sensors can only detect the superficial humidity of the wash load.
  • the control unit is often provided with partial or wrong information related to the actual moisture content of the wash load. This fact may of course bring to unsatisfactory drying conditions of the wash load, especially when drying bulky items.
  • water is maintained for a longer time in the interior of the load without being sensed by the strips sensor, while the external portion, that becomes dried more quickly being in contact with the sensor, generates a wrong "dryness-signal" condition.
  • the mentioned strips of sensors are relatively expensive, particularly with respect to the cost reduction needs of an industrial mass-production for the dryer.
  • Japanese patent application nr. 58-173599 discloses a condenser dryer, in which temperature sensors detect the temperature difference between two predefined locations of the interior drying volume, specifically the water of the condenser and the air after the heater.
  • the control unit stops the operating drying cycle as soon as the drying operation passes from a constant-rate drying period, in which said temperature difference is maintained substantially constant after an initial rise, to a falling-rate drying period, in which said temperature difference increases again.
  • This kind of solution is defective in that it still does not provide a precise control of the duration of the operating drying cycle, since the quantity and kind of the wash load is again not considered.
  • the wash load is light the mentioned constant-rate drying period may not be present or it may quite short.
  • the timing for the termination of the operating drying cycle cannot be precisely determined in certain operative conditions. In this cases, over-drying or under-drying conditions of the wash load still tend to occur.
  • This solution cannot be applied to an air vented dryer.
  • US patent nr. 4,640,022 discloses a condensing dryer, in which a first sensor is placed upstream the heater and a second sensor is placed upstream the condenser. After a predefined period of drying, the difference between the detected temperatures is evaluated. The drying cycle is terminated after another predefined period of time from when said difference overcomes a threshold value A+B, where A is a predefined reference value and B is a selected value, which may vary in accordance with the time elapsed from the starting of the drying cycle and which takes into account certain operating variables such as the quantity and kind of wash load to be dried.
  • predefined drying intervals are still adopted. Once these drying intervals are selected, they cannot be changed anymore according to the actual drying conditions of the wash load. This fact introduces some restrictions to the drying cycle control procedure, which might bring to unsatisfactory drying performances. Said control procedure is apparently influenced by the locations chosen for the sensor means and it is therefore not suitable for vented dryers. More specifically, one temperature sensor is located prior than the heating element dryer, In such position it would measure the temperature of the external air drawn into the drying chamber.
  • the main aim of the present invention is to provide a drying cycle control procedure for a household tumble dryer, which allows the overcoming of the above mentioned drawbacks.
  • the present invention provides a drying cycle control procedure for a household tumble dryer, according to the claim 1 proposed in the following and the claims depending therefrom.
  • drying cycle control procedure least comprises a termination control procedure for managing the termination the drying cycle.
  • Said termination control procedure comprises a cyclic estimation of the actual level of moisture of the wash load, basing on the information acquired from temperature sensor means, which are positioned at inlet and outlet portions of the dryer rotatable drum.
  • the present invention related to a household tumble dryer 1, which comprises a rotatable drum 2 that is preferable actuated by an electric motor 3.
  • the rotatable drum 2 defines an interior drying volume 200 for receiving a wash load 100 for drying.
  • the drying volume 200 comprises an air inlet portion 201, through which an airflow 20 enters the drying volume 200, and an air outlet portion 202, through which the airflow 20 exits from the drying volume 200 after having passed through it.
  • the dryer 1 is structured as a vented dryer.
  • the airflow 20 is thus taken directly from outside the dryer 1 and it is blown again into the external environment, after having passed through the drying volume 200.
  • the airflow 20 is heated by a heating element 5.
  • the dryer 1 is configured as a condensing dryer.
  • the airflow 20 follows a closed loop, which is interior the dryer 1. After having been heated by the heating element 5, the airflow enters the drying volume 200 through the air inlet portion 201. After having passed through the drying volume 200, the airflow exits from the air outlet portion 202 and is directed towards a condenser 4 for dehumidification. Then, the airflow 20 is directed again to the heating element 5 for being re-heated.
  • the correct circulation of the airflow 20 is ensured by properly positioned air ducts (not shown) and by a fan 8.
  • the dryer 1 comprises sensor means 6A-6B for detecting the temperature of the airflow 20 at the air inlet portion 201 and at the air outlet portion 202.
  • said sensor means comprise a first temperature sensor 6A, which is positioned at the air inlet portion 201, and a second temperature sensor 6B that is located at the air outlet portion 202.
  • the temperature sensors 6A-6B may advantageously comprise properly arranged thermocouples. Of course, temperature sensors of different kind may be used.
  • a control unit 70 is also provided in the dryer 1.
  • the control unit 70 controls the operating drying cycle of the dryer 1 by sending proper command signals 71 to the heating element 5, the motor 3 and the fan 8.
  • the control unit 70 receives from the sensor means 6A-6B signals 61 that are indicative of the temperature of the airflow 20 respectively at the air inlet and outlet portions 201, 202.
  • the control unit 70 manages the drying cycle of the dryer 1 by means of a drying cycle control procedure 500.
  • drying cycle intends the sequence of steps, which is needed for performing drying operations of the wash load 100.
  • the control procedure 500 may include some traditional steps (globally indicated by the reference 501), which may comprise the steps of enabling/disabling the user's access to the drying volume 100, the steps of sending command signals 71 to the electric motor 3, to the fan 8 and/or to the heating element 5, and so on.
  • the control procedure 500 includes a termination control procedure 502, which is aimed ad managing the termination of the drying cycle.
  • the termination control procedure 502 may be executed by processing means 7 of the control unit 70.
  • the termination control procedure 502 comprises an evaluation procedure 50 for estimating the actual level of moisture of the wash load 100, basing on the information provided by the sensor means 6A-6B.
  • the evaluation procedure 50 is cyclically executed as soon as the drying cycle starts running.
  • a time delay may be introduced according to the needs.
  • the evaluation procedure 50 comprises a first step i) and a second step ii) of acquiring an inlet air temperature value T IN and an outlet air temperature value T OUT , which are indicative of the temperature of the airflow 20 respectively at the air inlet portion 201 and at the air outlet portion 202.
  • the values T IN and T OUT may be advantageously obtained by properly filtering the signals 61 provided by the sensor means 6A-6B, so as to improve the signal to noise ratio.
  • the evaluation procedure 50 then comprises a third step iii) of calculating a first value A i , which is indicative of the mean difference between temperature value T IN and the temperature value T OUT over a predefined period of time ⁇ T
  • a i 1 ⁇ ⁇ T ⁇ t i - ⁇ ⁇ T t i T IN - T OUT ⁇ dt
  • t I the evaluation time
  • ⁇ T the temperature sampling time, which may be of 10s, for example.
  • the reference value A 0 is automatically updated.
  • the reference value A 0 basically represents a reference difference between the temperatures of the airflow at the inlet and outlet portions 201 and 202.
  • the evaluation procedure 50 comprises a further step v) of calculating a second value A max , which is the maximum between the calculated first value A i and the reference value A 0 .
  • the third value D i well represents the moisture content in the wash load.
  • D i is calculated from the difference between the temperature T IN of the heated airflow 20A, which has just been heated to enter the drying volume 200, and the temperature T OUT of the wet airflow 20B, which exits from the drying volume 200, said temperature T OUT being mainly correlated to the actual temperature of the wash load 100.
  • the results of the evaluation procedure 50 are used by the control unit 70 in the termination control procedure 502 to decide whether terminate or not the drying cycle.
  • the control unit 70 terminates the drying cycle if the third value D i is lower than a predefined threshold value D T , which is indicative of a desired moisture retention threshold M RD .
  • a predefined threshold value D T which is indicative of a desired moisture retention threshold M RD .
  • M RD moisture retention threshold
  • control unit 70 sends command signals 71 for switching off the heating element 5 and the electric motor 3.
  • the user can preferably access the drying volume 200 to remove the wash load 100, after a predefined time interval, so as to allow the wash load 100 to cool down.
  • the processing means 7 repeat the evaluation procedure 50 by considering the calculated second value A max as new reference value A 0 .
  • the household tumble dryer 1, according to the present invention has proven to fulfil the intended aims and objects.
  • the drying cycle control procedure 500 adopts a simple and effective control strategy for terminating the drying cycle, since the evaluation procedure 50 provides all the needed information for precisely determining the termination timing for the drying cycle, depending on the actual drying conditions of the wash load. That means that the possibilities of incurring in wash load over-drying or under-drying conditions are dramatically reduced.
  • the termination control procedure 502 is quite simple to carry out and it is provided also with a certain level of flexibility, since the termination of the drying cycle can be delayed or anticipated depending on the desired drying conditions of the wash load. To this aim, different threshold values D T can be made available.
  • drying cycle control procedure 500 works with the dryer 1 in vented or condensing configuration, without the need of additional hardware/software resources.
  • the dryer 1 has a simple structure, which has been proven to be easy to manufacture at industrial level, at competitive costs, since standard hardware components may be used, particularly for what concerning the temperature sensors.
  • the termination control procedure 502, the evaluation procedure 50 and, more in general, the whole drying cycle control procedure 500 may be easily carried out by properly arranged computer programs.
  • the processing means 70 may comprises one or more microprocessor units.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)

Claims (6)

  1. Procédure de commande de cycle de séchage (500) pour gérer le cycle de séchage d'un sèche-linge domestique (1), ledit sèche-linge domestique comprenant au moins un tambour rotatif (2), qui définit un volume de séchage intérieur (200) pour recevoir une charge de lavage (100) pour le séchage, ledit volume de séchage intérieur comprenant une partie d'entrée d'air (201), à travers laquelle un écoulement d'air (20, 20A) entre dans ledit volume de séchage interne, et une partie de sortie d'air (202), à travers laquelle ledit écoulement d'air (20, 20B) sort dudit volume de séchage interne après être passé à travers ledit volume de séchage interne, ledit sèche-linge domestique comprenant en outre un élément de chauffage (5) pour chauffer ledit écoulement d'air avant que ledit écoulement d'air atteigne ladite partie d'entrée d'air, et des moyens capteurs (6A, 6B) pour détecter la température dudit écoulement d'air au niveau de ladite partie d'entrée d'air et au niveau de ladite partie de sortie d'air, ladite procédure de commande de cycle de séchage comprenant une procédure de commande de terminaison (502) pour gérer la terminaison dudit cycle de séchage,
    caractérisée en ce que ladite procédure de commande de terminaison comprend les étapes suivantes :
    i) l'acquisition d'une valeur de température d'air d'entrée (TIN), qui est indicative de la température dudit écoulement d'air au niveau de ladite partie d'entrée d'air ; et
    ii) l'acquisition d'une valeur de température d'air de sortie (TOUT), qui est indicative de la température dudit air de sortie au niveau de ladite partie de sortie d'air ; et
    iii) le calcul d'une première valeur (Ai), qui est indicative de la différence moyenne entre ladite valeur de température d'air d'entrée (TIN) et ladite valeur de température d'air de sortie (TOUT) pendant une période prédéfinie (ΔT) ; et
    iv) la comparaison de ladite première valeur (Ai) à une valeur de référence (A0), qui est indicative de la différence moyenne entre ladite valeur de température d'air d'entrée (TIN) et ladite valeur de température d'air de sortie (TOUT) ; et
    v) le calcul d'une deuxième valeur (Amax), qui est le maximum entre ladite première valeur (Ai) et ladite valeur de référence (A0) ; et
    vi) le calcul d'une troisième valeur (Di) à partir du rapport entre la première valeur (Ai) et ladite deuxième valeur (Amax), ladite troisième valeur étant indicative de la valeur de rétention d'humidité (MR) de ladite charge de lavage ; et
    vii) si ladite troisième valeur (Di) est inférieure à une valeur seuil prédéfinie (DT), la terminaison dudit cycle de séchage ;
    viii) si ladite troisième valeur (Di) est supérieure à une valeur seuil prédéfinie (DT), la répétition d'au moins lesdites étapes i) à vi) en considérant ladite deuxième valeur (Amax) en tant que nouvelle valeur de référence (A0).
  2. Procédure de commande de cycle de séchage selon la revendication 1, caractérisée en ce que ladite valeur seuil prédéfinie (DT) est 60 %.
  3. Procédure de commande de cycle de séchage selon une des revendications 1 à 2, caractérisée en ce que ladite valeur seuil prédéfinie (DT) est indicative d'une valeur de rétention d'humidité souhaitée (MRD)
  4. Procédure de commande de cycle de séchage selon la revendication 3, caractérisée en ce que ladite valeur de rétention d'humidité souhaitée (MRD) est 3 %.
  5. Procédure de commande de cycle de séchage selon une des revendications précédentes, caractérisée en ce que le sèche-linge domestique est du type ventilé.
  6. Procédure de commande de cycle de séchage selon une des revendications 1 à 4, caractérisée en ce que le sèche-linge domestique est du type à condensation.
EP07115705A 2007-09-05 2007-09-05 Sèche-linge domestique avec une fin de cycle améliorée Expired - Fee Related EP2034086B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07115705A EP2034086B1 (fr) 2007-09-05 2007-09-05 Sèche-linge domestique avec une fin de cycle améliorée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07115705A EP2034086B1 (fr) 2007-09-05 2007-09-05 Sèche-linge domestique avec une fin de cycle améliorée

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EP2034086A1 EP2034086A1 (fr) 2009-03-11
EP2034086B1 true EP2034086B1 (fr) 2012-07-11

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EP07115705A Expired - Fee Related EP2034086B1 (fr) 2007-09-05 2007-09-05 Sèche-linge domestique avec une fin de cycle améliorée

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8443527B2 (en) 2009-12-18 2013-05-21 Whirlpool Corporation Fabric temperature estimation for a laundry dryer
ES2427913T3 (es) 2010-10-15 2013-11-04 Whirlpool Corporation Método para secar ropa en una secadora y control de la estimación de la humedad para obtener el fin automático del ciclo
EP2653602B1 (fr) 2012-04-19 2016-12-28 Whirpool Corporation Procédé permettant de détecter la fin de cycle d'un sèche-linge domestique
PL3842587T3 (pl) 2019-12-24 2024-05-20 Arçelik Anonim Sirketi Maszyna susząca do ubrań

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206552A (en) * 1978-04-28 1980-06-10 Mallory Components Group Emhart Industries, Inc. Means and method for controlling the operation of a drying apparatus
JPS60174194A (ja) 1984-02-20 1985-09-07 三洋電機株式会社 衣類乾燥機の制御装置
DE60220169T2 (de) * 2002-11-15 2008-02-14 Candy S.P.A., Monza Verfahren zum Trocknen von Wäsche in einer Trocknungsvorrichtung

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