EP2610401B1 - Système et procédé pour estimer la charge de linge dans un sèche-linge à tambour rotatif - Google Patents

Système et procédé pour estimer la charge de linge dans un sèche-linge à tambour rotatif Download PDF

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Publication number
EP2610401B1
EP2610401B1 EP11195942.5A EP11195942A EP2610401B1 EP 2610401 B1 EP2610401 B1 EP 2610401B1 EP 11195942 A EP11195942 A EP 11195942A EP 2610401 B1 EP2610401 B1 EP 2610401B1
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European Patent Office
Prior art keywords
laundry
time
signal
prefixed
drum
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EP11195942.5A
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German (de)
English (en)
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EP2610401A1 (fr
Inventor
Fabio Altinier
Daniele Beninato
Giorgio Coletto
Paolo Driussi
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Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • 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
    • 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

Definitions

  • the present invention relates to a system and a method to estimate a laundry-load in a rotatable-drum laundry drying machine.
  • the present invention relates also to a domestic rotatable-drum laundry drying machine which may correspond to a dryer operable to dry clothes, or to a washer-dryer operable to wash and dry clothes.
  • most of laundry drying appliances currently on the market generally comprise: a substantially parallelepiped-shaped, boxlike outer casing structured for resting on the floor; a substantially cylindrical rotatable drum which is structured for housing the laundry to be dried and is housed in axially rotating manner inside the casing to rotate about an horizontally-oriented 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 rotatable drum about its longitudinal reference axis during 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 and flows through the revol
  • the electronic central control unit of the laundry drying machine above disclosed is usually configured to optimize drying cycle by adjusting automatically the drying cycle time and/or the energy consuming, according to two mainly control parameters, namely the laundry moisture and the laundry load.
  • One of such laundry drying machine is disclosed in EP 2 221 412 .
  • a rotatable-drum 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 relates to a method to control a rotatable-drum 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 relates to an electronic control system 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 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 chamber 4 for receiving laundry 5 and rotates about a preferably, though not necessarily, horizontal axis of rotation 6.
  • axis of rotation 6 may be vertical or inclined.
  • Chamber 4 has a front access opening 7 closable by a door 8 preferably hinged to casing 2.
  • Rotatable-drum 3 is operable to be rotated about the axis of rotation 6 by an electric motor 9 (shown schematically in Figure 1 ) which is mechanically connected to the rotatable drum 3 through a drive member 10 for transmitting the motion for driving the rotatable-drum 3 in rotation about its axis 6.
  • an electric motor 9 shown schematically in Figure 1
  • a drive member 10 for transmitting the motion for driving the rotatable-drum 3 in rotation about its axis 6.
  • rotatable-drum laundry drying machine 1 also comprises a hot-air generator 11 housed inside the casing 2, and designed to circulate through rotatable-drum 3 a stream of hot air having a low moisture level, and which flows over and dries the laundry 5 inside chamber 4.
  • a hot-air generator 11 housed inside the casing 2, and designed to circulate through rotatable-drum 3 a stream of hot air having a low moisture level, and which flows over and dries the laundry 5 inside 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 from rotatable-drum 3; and supplying the heated, dehumidified air cyclically back into rotatable-drum 3, where it flows over, to dry, the laundry 5 inside the rotatable-drum 3.
  • hot-air generator 11 provides for 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.
  • the moisture condensing device 14 may comprise a heat-exchanger operable to condense 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. in which the hot and moisture-laden drying air from the rotatable-drum 3 is exhausted directly out of rotatable-drum laundry drier 1).
  • heating device 15 and moisture condensing device 14 may be embodied as 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 removes moisture from the drying air to condense the moisture inside it.
  • Rotatable-drum laundry drying machine 1 also comprises an electronic control system 16 configured to control rotatable-drum laundry drier 1 preferably on the basis of a drying cycle selected by a user through 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 sensed signal S1 which is indicative of the torque value 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 (force exerted by the motor 9 on the drum 3) to rotate the drum 3 itself during a laundry drying process.
  • the sensed signal S1 may be advantageously a motor torque signal or any electrical parameter which is directly or indirectly correlated with the motor torque.
  • the electronic control system 16 further comprises an electronic control unit 20 which is configured to: receive the sensed signal S1 which is indicative of a torque that electric motor 9 provides to the rotatable laundry drum 3; determine a value of a parameter that is indicative of the variation of the sensed signal S1 in time; and estimate the laundry-load contained within said drum 3 based on the determined value of the parameter.
  • the electronic control unit 20 is configured to: receive the sensed signal S1; determine the value of a parameter that is indicative of the variation of the sensed signal S1 in time (i.e. gradient of the sensed signal in time), based on a signal variation period/interval TIME corresponding to the elapsed time of the sensed signal S1 to change from a first prefixed signal value STH1 to a second prefixed signal value STH2; and estimate the laundry-load based on the determined variation period/interval TIME.
  • the laundry moisture decreases gradually so reducing step by step the total weight of the wet clothes, and the loss in weight affects directly the torque that electric motor 9 has to provide to the drum 3 to maintain a prefixed drum speed.
  • any parameter indicative of the motor supplied torque 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, are affected by the laundry weight loss in a similar manner as the torque supplied by the electric motor 9.
  • Figure 2 shows, as an example, some experimental data measured by Applicant during experimental tests, wherein it is shown how torque 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 load weight (indicated “L1” in Figure 2 ), a second laundry load associated to a medium load weight, i.e. about half of the maximum load accepted by the drum chamber 4 (indicated “L2" in Figure 2 ), and a third laundry load associated to high load weight, i.e. about the maximum load accepted by the drum chamber 4 (indicated "L3" in Figure 2 ).
  • a first laundry load associated to a low load weight indicated "L1" in Figure 2
  • a second laundry load associated to a medium load weight i.e. about half of the maximum load accepted by the drum chamber 4
  • a third laundry load associated to high load weight i.e. about the maximum load accepted by the drum chamber 4
  • Applicant found-out that it is possible to estimate the laundry load by measuring the elapsed time between two prefixed torque, or a torque-related signal values.
  • torque As a matter of the fact, as showed in Figure 2 , that refers to torque as motor parameter sensed by the sensing device 19, heavier is the laundry-load and longer is the time needed for intersecting the two predetermined torque limits STH1 and STH2.
  • Figure 2 shows that the elapsed time TIME1 associated with first laundry load L1 (low load weight) is lower than the elapsed time TIME2 (TIME1 ⁇ TIME2) associated with second laundry load L2 (medium load weight), and that the latest elapsed time TIME2 is lower than elapsed time TIME3 (TIME2 ⁇ TIME3) associated with third laundry load L3 (high load weight).
  • 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, and, more specifically estimates the laundry-load.
  • 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. At the same time, 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 acquires from the sensing device 19 the signal S1 indicative of the torque provided to the rotatable-drum 3 by the electric motor 9 (Block 120).
  • Electronic control unit 20 estimates the laundry-load based on calculated signal variation interval TIME. It should be pointed out that the conditions to be checked in Block 130 (S1 ⁇ STH1) and in Block 170 (S1 ⁇ STH2) take into account that sensed signal S1 changes, in particular decreases, during progression of a user selected drying cycle. Therefore, since it may happen that signal S1 crosses the threshold values STH1, STH2 in a moment between a signal S1 acquisition instant and the next one, i.e. when the sampling time dt is not yet elapsed, the condition that signal S1 has crossed the threshold values STH1, STH2 is considered verified in Blocks 130 and 170 whether such signal S1 is sensed equal to, or lower than, STH1 and STH2, respectively.
  • mathematical function may correspond to a table (stored-data in a memory support accessible to the electronic control unit 20) wherein a number of signal variation intervals - TIME - are associated with respective estimated laundry load.
  • Figure 3 shows a simplifying example of table containing three signal variation intervals - TIME - which are associated with three estimated load, respectively.
  • the measured signal variation interval TIME is 30 minutes, i.e. comprised within the second TIME (25 ⁇ T ⁇ 60) then, according to the function/table, the estimated laundry load is comprised between 2 kg and 4 kg.
  • electronic control unit 20 optimizes the drying cycle based on the estimated load by performing known optimization procedure (Block 190), such as regulating drying airflow rate, the heating power supplied by the drying air heating devices, the drum revolution speed and so on.
  • known optimization procedure such as regulating drying airflow rate, the heating power supplied by the drying air heating devices, the drum revolution speed and so on.
  • electronic control unit 20 may be configured to estimate a laundry-load contained within the drum 3 based on a signal variation ⁇ S1, which is indicative of the torque variation determined at the end of a prefixed time period ⁇ TS measured as from an instant T1 in which the sensed signal S1 has crossed the first prefixed value STH1.
  • Figure 4 shows a flow chart of the operating-phases performed by the electronic control system 16 when it carries out the control method, to estimate the laundry-load, according to the second embodiment of the present invention.
  • electronic control unit 20 starts a drying cycle selected by a user through the user control interface 18 (Block 200).
  • 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. At the same time, 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 210).
  • electronic control unit 20 receives from the sensing device 19 the sensed signal S1 indicative of the torque provided to the rotatable-drum 3 by the electric motor 9 (Block 220).
  • Electronic control unit 20 checks whether the sensed signal S1 value is equal to, or lower than, a first comparison signal threshold value STH1, which is retrieved by a memory support accessible to the electronic control unit 20 based on the drying cycle selected by the user (Block 230) and, if not (NO output from Block 230), it repeats operating-phases disclosed in Blocks 220 and 230. It should be pointed out that considerations made with reference to Block 130 about the condition that signal S1 has crossed the threshold values STH1, are valid also for Block 230 here disclosed.
  • the laundry-load quantity may be estimated by using an appropriate mathematical function based on the signal variation ⁇ S1 of the signal S1 during a prefixed time period ⁇ TS whose values depend on the drying cycle selected by the user and are stored in a memory support accessible to the electronic control unit 20.
  • Laundry_Load f ( ⁇ S1)
  • mathematical function may correspond to a table (stored-data in a memory support accessible to the electronic control unit 20) wherein a number of signal variation ⁇ S1 of the signal S1 are associated with respective estimated laundry load.
  • Figure 5 shows an example of table containing three signal variations AS1 which are associated with three estimated loads, respectively. For example, if the measured signal variation ⁇ S1 is comprised within Val1 and Val2 then, according to the function/table, the estimated laundry load is comprised between L1 and L2.
  • Figure 5 shows experimental data that prove that, during a same prefixed period ⁇ TS, signal variation ⁇ S1 is inversely proportional to the load quantity to be dried.
  • signal variation ⁇ S1 is inversely proportional to the load quantity to be dried.
  • graph of Figure 5 shows that the signal variation ⁇ S1 associated with first laundry load L1 (low load weight) is higher than the signal variation ⁇ S1 associated with second laundry load L2 (medium load weight), and that signal variation ⁇ S1 associated with second laundry load L2 is higher than signal variation ⁇ S1 associated with third laundry load L3 (high load weight).
  • Applicant found that it is possible to estimate the laundry load by determining the signal variation ⁇ S1 during a prefixed time, i.e. by determining the gradient of the sensed signal S1 in a prefixed amount of time.
  • the sensed signal S1 shown in Figure 5 may be advantageously a motor torque signal or any electrical parameter which is directly or indirectly correlated with the motor torque.
  • the electronic control system 16 can determine the value of a parameter, that is ⁇ S1 or TIME, such parameter being correlated to variation of the sensed signal S1 in time.
  • the electronic control system 16 can determine a sensed signal variation ⁇ S1 during a prefixed time period ⁇ TS, or it can determine a period TIME in which the sensed signal S1 changes from a first prefixed signal value STH1 to a second prefixed signal value STH2. Based on said sensed signal variation ⁇ S1, or on said determined period TIME, the electronic control system 16 estimates the laundry-load contained within said chamber (4).
  • the electronic control system 16 may estimate the weight of the laundry load placed into the drum chamber 4 by determining the slope of the curve representing the signal S1 variation during a user selected drying process time, samples of such curves being represented in Figures 2 and 5 .
  • electronic control unit 20 optimizes the drying cycle based on the estimated load by performing known optimization procedure (Block 310), such as regulating drying airflow rate, the heating power supplied by the drying air heating devices, the drum revolution speed and so on.
  • known optimization procedure such as regulating drying airflow rate, the heating power supplied by the drying air heating devices, the drum revolution speed and so on.
  • the operating-phases of the methods above disclosed may be contained in a computer program which is loadable in the electronic control system so that, when running, the electronic control system causes the rotatable-drum laundry drying machine 1 to operate according to what above disclosed.
  • Rotatable-drum laundry drying machine and method to estimate the laundry load of such machine according to the present invention are extremely simple to be performed.
  • the above-described dryer and method are also advantageous as, thanks to the estimation of load, it is possible to adequately optimize drying cycle by adjusting automatically the cycle time and/or the energy consumption, based on estimated load.
  • changes may be made to the rotatable-drum laundry drier or to the method as described and illustrated herein without, however, departing from the scope of the present invention, as defined by the appended claims.

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

Claims (12)

  1. Sèche-linge (1) comportant un tambour rotatif (3) à linge conçu pour tourner autour d'un axe (6) de rotation, ledit tambour comprenant une chambre (4) prévue pour recevoir du linge à sécher, un moteur électrique (9), qui est lié mécaniquement au tambour rotatif (3) à linge pour faire tourner ledit tambour rotatif (3) à linge autour de son axe (6) de rotation ; un moyen générateur (11) d'air chaud configuré pour fournir un flux d'air chauffé au tambour rotatif (3) à linge pendant un cycle de séchage ;
    le sèche-linge (1) comportant un système (16) de commande électronique qui comporte une unité (20) de commande électronique configuré pour :
    - récupérer des valeurs seuils préétablies (STH1, STH2) ou un laps de temps préétabli (ΔTS), qui sont stockés dans un support de mémoire accessible à l'unité (20) de commande électronique, selon le programme de séchage sélectionné ;
    - fournir un signal détecté (S1) qui est indicatif d'un couple que ledit moteur électrique (9) fournit au tambour rotatif (3) à linge ;
    - déterminer la valeur d'un paramètre (ΔS1) (TIME) qui est corrélé à une variation du signal détecté (S1) dans le temps, d'après lesdites valeurs préétablies récupérées (ΔTS) (STH1, STH2), et
    - estimer la charge de linge contenue à l'intérieur de ladite chambre (4) d'après ladite valeur déterminée dudit paramètre (ΔS1, TIME).
  2. Sèche-linge selon la revendication 1, ladite valeur dudit paramètre (ΔS1, TIME) étant une variation (ΔS1) de signal du signal détecté (S1) calculée à la fin d'un laps de temps préétabli (ΔTS) compté à partir d'un instant où le signal détecté (S1) a franchi une première valeur préétablie (STH1) ;
    ledit système (16) de commande électronique étant en outre configuré pour :
    - estimer la charge de linge contenue à l'intérieur de ladite chambre (4) d'après ladite variation déterminée (ΔS1) de signal.
  3. Sèche-linge selon la revendication 1, ladite valeur dudit paramètre (ΔS1, TIME) étant une période (TIME) de variation de signal, qui est indicative du temps mis par le signal détecté (S1) pour passer d'une première valeur préétablie (STH1) de signal à une deuxième valeur préétablie (STH2) de signal ;
    ledit système (16) de commande électronique étant en outre configuré pour :
    - estimer la charge de linge contenue à l'intérieur de ladite chambre (4) d'après ladite période déterminée (TIME) de variation de signal.
  4. Sèche-linge selon l'une quelconque des revendications précédentes, ledit système (16) de commande électronique comportant un dispositif (19) de détection servant à fournir ledit signal détecté (S1) ; ledit signal détecté (S1) étant le courant (I) à travers le moteur électrique (9) ou la tension (V) du moteur électrique (9), ou le flux magnétique (Φ) dans le moteur (9), ou le couple (TE) développé par le moteur électrique (9).
  5. Procédé pour estimer une charge de linge dans un sèche-linge (1) comportant un tambour rotatif (3) à linge conçu pour tourner autour d'un axe (6) de rotation, ledit tambour comprenant une chambre (4) prévue pour recevoir du linge à sécher, un moteur électrique (9), qui est lié mécaniquement au tambour rotatif (3) à linge pour faire tourner ledit tambour rotatif (3) à linge autour de son axe (6) de rotation ; un moyen générateur (11) d'air chaud configuré pour fournir un flux d'air chauffé au tambour rotatif (3) à linge pendant un cycle de séchage ; le sèche-linge (1) comportant un système (16) de commande électronique qui comporte une unité (20) de commande électronique, le procédé comportant les étapes consistant à :
    - récupérer des valeurs seuils préétablies (STH1, STH2) ou un laps de temps préétabli (ΔTS), qui sont stockés dans un support de mémoire accessible à l'unité (20) de commande électronique, selon le programme de séchage sélectionné ;
    - fournir un signal détecté (S1) qui est indicatif d'un couple que ledit moteur électrique (9) fournit au tambour rotatif (3) à linge ;
    - déterminer la valeur d'un paramètre (ΔS1 TIME) qui est corrélé à la variation du signal détecté (S1) dans le temps d'après lesdites valeurs préétablies récupérées (ΔTS) (STH1, STH2) ; et
    - estimer la charge de linge contenue à l'intérieur de ladite chambre (4) d'après ladite valeur déterminée dudit paramètre (ΔS1, TIME).
  6. Procédé selon la revendication 5, comportant les étapes consistant à :
    - déterminer ladite valeur dudit paramètre (ΔS1, TIME) sur la base d'une variation (ΔS1) de signal du signal détecté (S1) calculée à la fin d'un laps de temps préétabli (ΔTS) mesuré à partir d'un instant où signal détecté (S1) a franchi une première valeur préétablie (STH1) ;
    - estimer la charge de linge contenue à l'intérieur de ladite chambre (4) d'après ladite variation déterminée (ΔS1) de signal.
  7. Procédé selon la revendication 5, comportant les étapes consistant à :
    - déterminer ladite valeur dudit paramètre (ΔS1, TIME) sur la base d'une période (TIME) de variation de signal, qui est indicative du temps mis par le signal détecté (S1) pour passer d'une première valeur préétablie (STH1) de signal à une deuxième valeur préétablie (STH2) de signal ;
    - estimer la charge de linge contenue à l'intérieur de ladite chambre (4) d'après ladite période déterminée (TIME) de variation de signal.
  8. Procédé selon l'une quelconque des revendications 5 à 7, ledit signal détecté (S1) étant le courant (I) à travers le moteur électrique (9) ou la tension (V) du moteur électrique (9), ou le flux magnétique (Φ) dans le moteur (9), ou le couple (TE) développé par le moteur électrique (9).
  9. Système (16) de commande électronique configuré pour estimer une charge de linge dans un sèche-linge (1) comportant un tambour rotatif (3) à linge conçu pour tourner autour d'un axe (6) de rotation, ledit tambour comprenant une chambre (4) prévue pour recevoir du linge à sécher, un moteur électrique (9), qui est lié mécaniquement au tambour rotatif (3) à linge pour faire tourner ledit tambour rotatif (3) à linge autour de son axe (6) de rotation ; un moyen générateur (11) d'air chaud configuré pour fournir un flux d'air chauffé au tambour rotatif (3) à linge pendant un cycle de séchage ;
    le système (16) de commande électronique comportant :
    - une unité (20) de commande électronique configurée pour récupérer des valeurs seuils préétablies (STH1, STH2) ou un laps de temps préétabli (ΔTS), qui sont stockés dans un support de mémoire accessible à l'unité (20) de commande électronique, selon un programme de séchage sélectionné ;
    - un dispositif (19) de détection servant à fournir un signal détecté (S1) qui est indicatif d'un couple que ledit moteur électrique (9) fournit au tambour rotatif (3) à linge ;
    ladite unité (20) de commande étant en outre configurée pour :
    - recevoir ledit signal détecté (S1) ;
    - déterminer la valeur d'un paramètre (ΔS1, TIME) qui est corrélé à la variation du signal détecté (S1) dans le temps d'après lesdites valeurs préétablies récupérées (ΔTS) (STH1, STH2) ;
    - estimer la charge de linge contenue à l'intérieur de ladite chambre (4) d'après ladite valeur déterminée dudit paramètre (ΔS1, TIME).
  10. Système (16) de commande électronique selon la revendication 9, ladite valeur dudit paramètre (ΔS1, TIME) étant déterminée sur la base d'une variation (ΔS1) de signal du signal détecté (S1) calculée à un laps de temps préétabli (ΔTS) mesuré à partir d'un instant où le signal détecté (S1) a franchi une première valeur préétablie (STH1) ;
    ladite unité (20) de commande étant en outre configurée pour :
    - estimer la charge de linge contenue à l'intérieur de ladite chambre (4) d'après ladite variation déterminée (ΔS1) de signal.
  11. Système (16) de commande électronique selon la revendication 9, ladite valeur dudit paramètre (ΔS1, TIME) étant déterminée sur la base d'une période (TIME) de variation de signal, qui est indicative du temps écoulé pendant lequel le signal détecté (S1) passe d'une première valeur préétablie (STH1) de signal à une deuxième valeur préétablie (STH2) de signal ;
    ladite unité (20) de commande étant en outre configurée pour :
    - estimer la charge de linge contenue à l'intérieur de ladite chambre (4) d'après ladite période déterminée (TIME) de variation de signal.
  12. Système (16) de commande électronique selon l'une quelconque des revendications 9 à 11, ledit signal détecté (S1) étant le courant (I) à travers le moteur électrique (9) ou la tension (V) du moteur électrique (9), ou le flux magnétique (Φ) dans le moteur (9), ou le couple (TE) développé par le moteur électrique (9).
EP11195942.5A 2011-12-28 2011-12-28 Système et procédé pour estimer la charge de linge dans un sèche-linge à tambour rotatif Active EP2610401B1 (fr)

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