EP0362676B1 - Dispositif pour contrôler le séchage du linge dans un séchoir à linge - Google Patents

Dispositif pour contrôler le séchage du linge dans un séchoir à linge Download PDF

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Publication number
EP0362676B1
EP0362676B1 EP89117773A EP89117773A EP0362676B1 EP 0362676 B1 EP0362676 B1 EP 0362676B1 EP 89117773 A EP89117773 A EP 89117773A EP 89117773 A EP89117773 A EP 89117773A EP 0362676 B1 EP0362676 B1 EP 0362676B1
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EP
European Patent Office
Prior art keywords
drying
heating element
control device
comparator
laundry
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 - Lifetime
Application number
EP89117773A
Other languages
German (de)
English (en)
Other versions
EP0362676A3 (fr
EP0362676A2 (fr
Inventor
Giuseppe Frucco
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.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Priority to AT8989117773T priority Critical patent/ATE104711T1/de
Publication of EP0362676A2 publication Critical patent/EP0362676A2/fr
Publication of EP0362676A3 publication Critical patent/EP0362676A3/fr
Application granted granted Critical
Publication of EP0362676B1 publication Critical patent/EP0362676B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • D06F2103/02—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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • 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
    • D06F2105/28—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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/10—Power supply arrangements, e.g. stand-by circuits
    • 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 an electronic control device for a clothes drier adapted to allow for the run of drying cycles for drying the laundry in a predetermined manner and for limited durations.
  • Italian patent application no. 45702 A/88 filed by the same applicant on Jan. 25, 1988, describes a laundry drying control device for a clothes drier comprising a microprocessor containing encoded information on the drying cycles to be selected and adapted to control the run of the selected cycles: first, second and third selector means adapted to select drying cycles with nominal power and with reduced power of a heating element with adjustable power and adapted to keep the heating element switched on for a supplementary period: and integrator means constituted by electrical capacitors connected with two sensor electrodes disposed within the drum of the machine and adapted to be short-circuited by the damp laundry.
  • This control device further comprises an electronic comparator adapted to switch on and off the heating element of the machine in accordance with a comparison between the charging voltage level of the integrator means and a predetermined reference voltage level and the microprocessor of the device is designed to generate through one of its outputs a continuous rectangular enabling signal and to send this signal to the microprocessor through a corresponding input, making it pass through the integrator circuit and the second and third selector means.
  • the microprocessor is in particular in a position to identify, at the output of the comparator, the absence or presence of the enabling signal when the drying cycles have been selected through the first or second selector means, and an enabling signal identical but complementary to the preceding one when the drying cycles are selected through the third selector means.
  • the microprocessor thus controls the run of the drying cycles with nominal or reduced power of the heating element or with supplementary switching on of the element.
  • the control device thus constituted allows for a correct run of the drying cycles for the laundry in the machine, providing for the heating element to be switched on with the fixed and invariable power for the entire duration of each selected cycle.
  • this does not allow for an adaptation of the heating power effectively required for drying the laundry during the run of the cycle, for a power which is variable while the laundry is dried, resulting in higher consumption of electrical power.
  • the document DE-A-2 904 274 discloses a laundry drying control device with a thermostat for a cloth drier including a pair of heating elements.
  • the invention is based on the problem of overcoming the above-mentioned disadvantages and limits by means of a laundry drying control device for a clothes drier realized in such a way as to effect the run of each drying cycle with optimal consumption of electrical power and with a limited duration of the cycle.
  • This control device is in particular adapted to switch on the electrical heating element with the maximum heating power during the initial phase of each "acrylic" drying cycle for drying delicate synthetic fabrics, the temperature of the fabrics being slowly increased until the operating value is reached and the heating element being then switched on with reduced power for the entire duration of the cycle.
  • this control device is in a position to keep the electrical heating element switched on with reduced heating power during the run of the so-called "extra dry” drying cycles for completely drying cotton and resistant synthetic fabrics, having the heating element switched on for a supplementary time period.
  • an electronic laundry drying control device for a clothes drier realized in substantially the same way as the device described in Italian patent application no. 45702 A/88, filed by the same applicant on Jan. 25, 1988, and capable of controlling the automatic run of cycles for drying laundry consisting of cotton and resistant synthetic fabrics, the cycles being performed with the maximum heating power until the predetermined laundry drying level is reached, or keeping the heating element with adjustable power of the machine switched on for a predetermined supplementary period so as to effect complete drying of the laundry (these drying cycles being known as "extra dry cycles").
  • This device is also capable of controlling the automatic run of cycles for drying laundry consisting of delicate synthetic fabrics, the cycles being performed with reduced heating power until the predetermined laundry drying level is reached (these drying cycles being known as "acrylic cycles").
  • control device substantially comprises first and second selector means 1 and 2 constituted by conventional push-button switches disposed in the control panel of the machine and adapted to be operated separately and manually to select the aforesaid "acrylic" drying cycle or the "extra dry” cycle with the heating element of the machine being switched on for a predetermined supplementary period, said device also comprising, as in the case of patent application no 45702 A/88, further selector means (not shown) for selecting "extra dry" drying cycles with the maximum heating power.
  • selector means shall not be described here since they are not relevant to the effects of the invention.
  • This control device further comprises at least one electrical heating element 3 with adjustable power and a moisture control means 4 both realized in the way described below and adapted to effect the heating of the laundry drying air and to predetermine the drying level required for each laundry load, respectively.
  • electrical heating element 3 is subdivided into at least a first and a second portion 5, 6 which are interconnected electrically, preferably in series, and supplied by conductors 7 and 8 of the electrical circuit of the machine through an electrical contact 9 of the normally closed type and provided for the purposes to be described below, and through safety thermostats 10, 11 interconnected in series and calibrated so as to switch off the heating element portions in the presence of elevated temperature within the machine.
  • Portions 5 and 6 of heating element 3 are further dimensioned to supply a reduced heating power so as to effect an adequate drying temperature for delicate synthetic fabrics when both these portions are energized, and a maximum heating power so as to effect a drying temperature more elevated than the preceding one, although without damage to the fabrics, when only portion 6 of the heating element is energized, a state obtained by short-circuiting the other portion 5 of the heating element due to the closing of an electrical contact 12 on an electrical conductor 13 connected to the heads of portion 5, the closing being performed in the ways described below.
  • moisture control means 4 is constituted by an integrator circuit equipped with a plurality of electrical capacitors collected with limiting resistors, diodes and further electronic components known as such, the circuit being adapted to vary the time constant of the capacitors in accordance with the drying level required by the laundry, and by two sensor electrodes disposed within the rotating drum of the machine (not shown) and connected with the integrator circuit and with the ground of the machine, the electrodes being adapted to be short-circuited by the damp laundry to be dried.
  • integrator circuit and sensor electrodes which are not represented in the drawing, are identical to the corresponding electrical components described in the above-mentioned Italian patent application no. 45702 A/88 and therefore have the same functions as these components.
  • the present device further comprises an electronic comparator 14 and a logical AND gate 15 of the conventional type and a driver 16 or similar driving element controlled alternatively by comparator 14 or by logical AND gate 15 for moving electrical contact 12 associated with the driver from the normal closed position to the open position with respect to conductor 13, in which states portion 5 is switched off and on, respectively, with respect to other portion 6 of the heating element.
  • comparator 14 is provided with two inputs 17 and 18 respectively connected with a first resistor 19 supplied by a predetermined continuous voltage Vcc, the resistor being adapted in turn to be connected in parallel with a second resistor 20 that is grounded, due to the closing of contact 21 of first selector means 1, the contact being connected with the second resistor, and with a conventional electronic converter 22 adapted to detect constantly the temperature levels of the drying air within the clothes drier and to convert these temperature levels into corresponding voltage levels.
  • the comparator is further provided with an output 23 connected to driver 16 whose logical level is determined by comparison between a predetermined reference voltage V REF applied to input 17 of the comparator and generated by the closing of contact 21 and a variable voltage generated by converter 22 during the run of the drying cycle selected through first selector means 1.
  • the level of reference voltage V REF is in particular selected so as to be identical to the voltage level generated by converter 22 and applied to input 18 of comparator 14 upon attainment of the operating temperature during drying, at which temperature delicate synthetic fabrics are dried in a satisfactory manner without danger of overheating or damage thereto.
  • the reference voltage assumes a level higher then the voltage level generated by converter 22 in accordance with the operating temperature during drying when contact 21 of selector means 1 is kept in the open position, in which state only voltage Vcc is applied to input 17 of comparator 14 through resistor 19.
  • logical AND gate 15 is provided with two inputs 24 and 25 connected respectively to a first resistor 26 connected electrically to a second resistor 27 that is grounded and can be energized by the above-described predetermined continuous voltage Vcc due to the closing of contact 28 of second selector means 2, the contact being connected to both resistors 26 and 27, and with output 29 of moisture control means 4 specified above.
  • AND gate 15 is further provided with an output 30 connected to driver 16 whose logical level is determined by comparison between the voltage levels applied respectively to inputs 24 and 25 of the gate.
  • AND gate 15 is also subjected to the predetermined voltage generated by moisture control means 4 and present at output 29 thereof, in which state output 30 of the gate is switched to logical level 1, thereby energizing driver 16 and thus connecting in series portions 5 and 6 of the heating element, thereby obtaining a reduced heating power for the drying air.
  • the inventive control device further comprises a timing element 31 or similar conventional-type element connected electrically to output 29 of moisture control means 4 and mechanically to electrical contact 9 in order to allow for closing or opening of the contact, thereby switching heating element 3 on or off in accordance with the absence or presence of the predetermined voltage at input 29 of the moisture control means.
  • the "acrylic" cycle is triggered by closing contact 21 of selector means 1 and preparing moisture control means 4 and timing element 31 to obtain the desired drying level for the laundry.
  • reference voltage V REF with a predetermined fixed level and the voltage generated by converter 22 and proportional to the drying temperature are applied respectively to inputs 17 and 18 of comparator 14, the initial level of the latter voltage being minimal and lower then that of voltage V REF .
  • output 23 of comparator 14 is at logical level 0 so that driver 16 remains deenergized, thereby maintaining portion 5 of the heating element short-circuited.
  • timing element 31 remains deenergized, given that output 29 of moisture control means 4 is not subjected to the above-mentioned predetermined voltage, since the drying level provided for the laundry has not yet been reached.
  • the timing element keeps electrical contact 9 closed so that only portion 6 of the heating element is energized, in which state the run of the drying cycle is effected with the maximum heating power and thus with rapid heating of the laundry and of the machine to the corresponding operating temperature.
  • the "extra dry" cycle is triggered by closing contact 28 of selector means 2 and preparing moisture control means 4 and timing element 31, as above, to obtain the desired drying level for the laundry.
  • the predetermined voltage Vcc is applied to input 24 of logical AND gate 15, while the other input 25 of the gate is not live, given that output 29 of moisture control means 4 is not live either since the drying level provided for the laundry has not yet been reached.
  • output 30 of logical AND gate 15 is at logical level 0 so that driver 16 remains deenergized, thereby keeping portion 5 of the heating element short-circuited.
  • timing element 31 also re-mains deenergized and thus effects the switching on of portion 6 of the heating element only, in the ways and for the purposes already described in the corresponding phase of the "acrylic" drying cycle.
  • output 29 of moisture control means 4 and thus input 25 of AND gate 15 are subjected to the aforesaid predetermined voltage, so that output 30 of the AND gate is switched to logical level 1, thereby energizing driver 16 which opens contact 12 and thus interconnects in series portions 5 and 6 of the heating element.
  • timing element 31 which therefore keeps electrical contact 9 closed and thus portions 5 and 6 of the heating element switched on for a period of time predetermined by the timing element, during which a supplementary drying of the laundry is performed with reduced heating power, thereby avoiding undesirable over-heating of the laundry and the electrical components of the machine.
  • timing element 31 automatically opens electrical contact 9, thereby switching off portions 5 and 6 of the heating element and preparing the machine for the run of the subsequent cooling phase analogous to that of the "acrylic" cycles.
  • the present control device can be advantageously incorporated in a conventional microprocessor adapted to control the run of all the operative functions of the clothes drier.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Claims (4)

  1. Dispositif de commande électronique de séchage de linge, pour un séchoir à linge, comprenant au moins un élément chauffant électrique à puissance réglable, des premier et deuxième moyens sélecteurs propres à respectivement sélectionner des cycles de séchage avec une puissance réduite de l'élément chauffant et à maintenir l'élément en fonction pour une période supplémentaire prédéterminée, et comprenant en outre un moyen de contrôle d'humidité propre à effectuer le séchage du linge à des niveaux de séchage prédéterminés selon les cycles respectivement choisis au moyen des premier et deuxième moyens sélecteurs, caractérisé en ce que l'élément chauffant (3) est subdivisé en au moins une première et une deuxième parties (5, 6) électriquement reliées l'une à l'autre, la première partie (5) étant propre à être sélectivement mise en court-circuit par l'intermédiaire de premiers et deuxièmes moyens comparateurs (14, 15) respectivement associés aux premier et deuxième moyens sélecteurs (1, 2) lorsque la température de fonctionnement est atteinte ainsi que le degré de séchage requis pendant le séchage, respectivement, le dispositif de commande comprenant en outre des moyens commutateurs (31) propres à être commandés par le moyen de contrôle d'humidité (4) et à mettre en et hors fonction les première et deuxième parties (5, 6) de l'élément chauffant pendant chaque cycle de séchage respectivement sélectionné.
  2. Dispositif de commande selon la revendication 1, caractérisé en ce que les premiers moyens comparateurs comprennent un comparateur électronique (14) dont les entrées (17, 18) sont respectivement reliées à une tension de référence prédéterminée (VREF) à appliquer par l'intermédiaire du premier moyen sélecteur (1), et à un niveau de tension qui est variable en fonction de la température de séchage et qui est produit par un convertisseur électronique (22), le comparateur (14) étant relié par sa sortie (23) à un circuit de commande (16) ou à un autre élément de commande similaire propre à fermer ou ouvrir un contact électrique (12) par rapport à un conducteur (13) relié aux têtes de la première partie (5) de l'élément chauffant.
  3. Dispositif de commande selon la revendication 2, caractérisé en ce que les deuxièmes moyens comparateurs comprennent une porte ET logique (15) dont les entrées (24, 25) sont respectivement reliées à une tension prédéterminée (Vcc) à appliquer par l'intermédiaire du deuxième moyen sélecteur (2) et à une autre tension prédéterminée identique à la précédente et à appliquer par l'intermédiaire de la sortie (29) du moyen de contrôle d'humidité (4), la porte ET logique (15) étant reliée par sa sortie (30) au circuit de commande (16).
  4. Dispositif de commande selon la revendication 3, caractérisé en ce que les moyens commutateurs comprennent un élément de temporisation (31) ou un élément similaire, électriquement relié à la sortie (29) du moyen de contrôle d'humidité (4) et mécaniquement relié à un contact électrique (9) du type normalement fermé, qui est à son tour relié aux première et deuxième parties (5, 6) de l'élément chauffant, le contact électrique (9) étant propre à être ouvert par l'élément de temporisation (31) uniquement à la fin du cycle de séchage respectivement sélectionné.
EP89117773A 1988-10-06 1989-09-26 Dispositif pour contrôler le séchage du linge dans un séchoir à linge Expired - Lifetime EP0362676B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT8989117773T ATE104711T1 (de) 1988-10-06 1989-09-26 Vorrichtung zur ueberwachung der waeschetrocknung in einem waeschetrockner.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8845761A IT1225123B (it) 1988-10-06 1988-10-06 Dispositivo di controllo dell'asciugatura della biancheria per macchina asciugabiancheria
IT4576188 1988-10-06

Publications (3)

Publication Number Publication Date
EP0362676A2 EP0362676A2 (fr) 1990-04-11
EP0362676A3 EP0362676A3 (fr) 1992-03-11
EP0362676B1 true EP0362676B1 (fr) 1994-04-20

Family

ID=11258109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117773A Expired - Lifetime EP0362676B1 (fr) 1988-10-06 1989-09-26 Dispositif pour contrôler le séchage du linge dans un séchoir à linge

Country Status (4)

Country Link
EP (1) EP0362676B1 (fr)
AT (1) ATE104711T1 (fr)
DE (1) DE68914765T2 (fr)
IT (1) IT1225123B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9139951B2 (en) 2012-08-06 2015-09-22 Whirlpool Corporation Laundry treating appliance and method of controlling the heater thereof
US9416476B2 (en) 2012-05-30 2016-08-16 Whirlpool Corporation Laundry treating appliance and method of controlling the heater thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2610400B1 (fr) 2011-12-27 2018-12-05 Electrolux Home Products Corporation N.V. Appareil de séchage et procédé de contrôle d'un cycle de séchage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942265A (en) * 1974-05-09 1976-03-09 General Electric Company Dryer control arrangement
DE2537821A1 (de) * 1975-08-26 1977-03-10 Miele & Cie Waeschetrockner mit feuchtigkeitsabhaengiger steuerung des trockenvorgangs
DE2904274C2 (de) * 1979-02-05 1982-06-03 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Thermostatgeregelte Schaltungsanordnung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9416476B2 (en) 2012-05-30 2016-08-16 Whirlpool Corporation Laundry treating appliance and method of controlling the heater thereof
US9139951B2 (en) 2012-08-06 2015-09-22 Whirlpool Corporation Laundry treating appliance and method of controlling the heater thereof

Also Published As

Publication number Publication date
EP0362676A3 (fr) 1992-03-11
DE68914765T2 (de) 1994-08-04
IT1225123B (it) 1990-11-02
IT8845761A0 (it) 1988-10-06
ATE104711T1 (de) 1994-05-15
DE68914765D1 (de) 1994-05-26
EP0362676A2 (fr) 1990-04-11

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