EP0686721B1 - Procédé pour optimiser l'utilisation de l'eau dans les machines à laver - Google Patents

Procédé pour optimiser l'utilisation de l'eau dans les machines à laver Download PDF

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Publication number
EP0686721B1
EP0686721B1 EP94108840A EP94108840A EP0686721B1 EP 0686721 B1 EP0686721 B1 EP 0686721B1 EP 94108840 A EP94108840 A EP 94108840A EP 94108840 A EP94108840 A EP 94108840A EP 0686721 B1 EP0686721 B1 EP 0686721B1
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Prior art keywords
water
stage
load
tub
conductivity
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EP94108840A
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German (de)
English (en)
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EP0686721A1 (fr
Inventor
Raffaele C/O Whirlpool Italia S.R.L. Paganini
Daniele C/O Whirlpool Italia S.R.L. Turetta
Claudio C/O Whirlpool Italia S.R.L. Civanelli
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Whirlpool Europe BV
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Whirlpool Europe BV
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Priority to EP94108840A priority Critical patent/EP0686721B1/fr
Priority to DE69424409T priority patent/DE69424409T2/de
Publication of EP0686721A1 publication Critical patent/EP0686721A1/fr
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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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or 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
    • D06F2103/04—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
    • D06F2103/16—Washing liquid 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
    • D06F2103/18—Washing liquid level
    • 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
    • D06F2103/20—Washing liquid condition, e.g. turbidity
    • D06F2103/22—Content of detergent or additives
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D06F2103/46—Current or voltage of the motor driving the drum
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/02—Water supply

Definitions

  • This invention relates to a method for optimizing water consumption by a washing machine, a washing-drying machine or the like in washing and rinsing a load or clothes placed in its usual drum, in accordance with the introduction to the main claim.
  • the invention also relates to a device for implementing the aforesaid method.
  • EP-A-0 441984 suggests, in a washing machine, a control unit using the fuzzy logic to evaluate the clothes load and the water quantity in the different cycles using water conductivity measuring means.
  • Methods and devices are known for evaluating the water quantity to be used in a washing machine during clothes washing and rinsing.
  • devices are known which measure the water conductivity on termination of the wash stage or of a rinse stage in order to determine the water quantity to he used for the next stage in the treatment of the load in said machine.
  • these known devices and methods operate in accordance with logics comprising the definition of precise predetermined water levels based on the measured water conductivity. These levels can either be totally insufficient for complete detergent removal or be considerably higher than required for this removal.
  • Methods and devices are also known for evaluating the weight of the load placed in a washing machine or the like in order to define a suitable water quantity (which is hence fixed) for use in each machine operation stage.
  • This water quantity is not changed in any way after the wash stage, even if after the first rinse stage the clothes retain only a minimum detergent quantity, which could be removed by a water volume much smaller than that set at the start of operation of the washing machine.
  • Known methods and devices therefore do not completely attain the object of properly limiting the water quantity user, by the appliance during the treatment of the load, neither do they provide a metered water utilization, at least for each rinse stage, based on the detergent quantity still present in the load after the preceding treatment stage (such as a rinse stage).
  • An object of the present invention is to provide a method and corresponding device which overcome the drawbacks of analogous known devices and methods.
  • a particular object of the invention is to provide a method and corresponding device which allow optimized water utilization in a washing machine or the like and in particular, during each rinse stage, on the basis of the detergent used for washing and remaining associated with the load after a preceding rinse stage.
  • a further object is to provide a method and corresponding device able to achieve high rinsing efficiency, ie able to free the clothes from the detergent for any fed quantity of this latter, even if the user has introduced into the usual drawer a detergent quantity greater than that required for washing the load being treated.
  • a further object is to provide a method and device able to achieve optimum washing and rinsing of the load even if its weight has been erroneously evaluated during the initial stage of its treatment.
  • a further object is to provide a method enabling the rinse stage to be shortened, with consequent reduction in the appliance operating costs.
  • At least the evaluation of the water quantity to be used in the rinse stage following a first wash stage is effected by the known fuzzy logic procedure.
  • This latter has been known for some time and is used in various technical sectors.
  • US4910684 describes a method for controlling a rotary kiln during its start-up.
  • This text amply describes the use of fuzzy logic.
  • This latter uses rules defined by "linguistic operations" relative to the control actions to be taken on the basis of a given process condition, ie "if” a certain condition arises, "then” a certain control action is taken.
  • the key elements in the control rules are terms such as “medium reduction”, “open slightly”, “high”, “somewhat low” and the like.
  • each of these terms is represented by a single fuzzy function which for a given process condition is used to establish a value within the range (0,1).
  • the logic value of a condition which in binary logic is usually restricted to "true” or “false” (0 or 1), can have any value within the range (0,1) in fuzzy logic, the logic value being a measure of the fulfilment of the condition for a given process state.
  • a washing machine (or the like) comprises a cabinet 1, and a drum 2 rotating within a tub 3 into the top of which there opens a pipe 4 (from a usual detergent distribution drawer 5) and into the bottom of which, in the machine of Figures 2 and 3, there opens a pipe 6.
  • This latter originates from a pipe 7 to which it is connected via a three-way solenoid valve 8, this pipe terminating in the drawer 5 and being connected, upstream of the solenoid valve 8, to a wash water feed pipe 10 and to a prewash water feed pipe 11.
  • Solenoid valves 12 and 13 respectively are contained in these latter (see Figure 4).
  • a conductivity sensor 14 for example a conductivity cell
  • a further sensor 14A being positioned in the pipe 7.
  • Each sensor 14, 14A is connected to an operating and control unit 15 for the washing machine.
  • This unit preferably of microprocessor type, operates in accordance with fuzzy logic and is connected to a known current sensor 16 associated with the usual electric motor of the appliance and used to measure the current absorbed by said motor at least before the wash stage, to a pressure sensor 17 used to provide the unit 15 with a continuous indication of the water level in the tub 3, and to a temperature sensor 18 (for example a negative temperature coefficient or NTC sensor) to enable the unit 15 to measure the temperature of the water in the tub.
  • a temperature sensor 18 for example a negative temperature coefficient or NTC sensor
  • the sensor 17 can be replaced by a flowmeter 18A to enable the tub 3 to be filled to a predetermined level.
  • the unit 15 consequently continuously receives the signals from said sensors, and in accordance with fuzzy logic controls the solenoid valves 8, 12, 13, the possible flowmeter 18A, a usual heating element 19 positioned in the tub 3, a usual discharge pump 20, and an electric motor control member 21 (of known type).
  • the unit 15 also dialogues with a usual interface 22 (such as a keypad, one or two knobs and a display) positioned on a face of the cabinet 1 (not shown) by which the user selects in known manner the wash program which the machine is to execute and notes the state of execution of this program.
  • Figure 1 also shows a usual power supply 23 from the electric mains 24.
  • the block 30 represents the start of the procedure of said method.
  • the unit 15 On pressing the start button, the unit 15 acts on the motor control member 21 to operate the appliance electric motor.
  • the motor By means of this action the motor (see Figure 6) firstly gradually increases its rpm and then undergoes a steep rise (ramp) by considerably increasing its rpm within a very short time, followed by its stoppage. This corresponds to the motor current absorption shown in Figure 7, which shows a current peak value (IMAX) and a mean reference value (IREF) calculated in any known manner.
  • IMAX current peak value
  • ITF mean reference value
  • the values of the grade value of the calculated value DI are divided within the cartesian plane into areas in accordance with the known rules of this logic: the area A1 corresponds to a low grade value (L1), the area A2 corresponds to a medium degree (M) and the area A3 corresponds to a high degree (H).
  • L1 low grade value
  • M medium degree
  • H high degree
  • the unit 15 determines substantially the output values weighted on the basis of said grade values, and in accordance with the known mathematical formula: calculates the resultant value corresponding to the water quantity to be used in the next operating stage of the washing machine.
  • the formula in known manner:
  • the resultant output hence corresponding to the centre of gravity of the individual outputs weighted in accordance with the known rules of fuzzy logic, is calculated by the unit 15. All this is achieved in the blocks 31 (current measurement) and 32 (fuzzy logic routine execution) in which the weight of the load placed in the drum 2 is evaluated ( Figure 5).
  • the unit 15 uses known calculation algorithms to define in proportion the water quantity (in litres or in terms of levels) necessary for effectively washing said load and for effecting a first rinse stage (or simply a first rinse).
  • the blocks 31, 32 and 33 define a stage 34 in which the weight of the load and of the water required for its washing and for the first rinse are determined.
  • the stage 34 can be used for determining the water quantity to be used for only the first rinse stage, the water quantity to be used for the wash being unequivocally determined by the attainment of a suitable water level in the tub 3. This level is attained and checked (by the unit 15) via the flowmeter 18A, if provided.
  • the unit 15 After the stage corresponding to the block 33, the unit 15 starts the washing of the load (block 35). During this latter the unit monitors the water level by means of the pressure sensor 17 and its temperature by means of the sensor 18. The stage represented by the block 35 is effected by usual procedures, and on their termination (evaluated in the stage represented by the block 36) the pump 20 is activated to discharge the water from the tub 3.
  • the drum 2 is made to rotate (in known manner) at a spinning speed such as to expel water from the load.
  • a further stage 34 can then be executed to improve the evaluation of the load weight before executing the rinse stage so as to optimize the value representing the water quantity to be used for implementing the first rinse stage.
  • This further stage 34 following the wash could also totally replace the analogous stage preceding the wash.
  • a first rinse stage starts, effected by introducing into the tub a water quantity evaluated in the stage corresponding to the block 33 (or the equivalent stage executed after the wash).
  • the unit 15 evaluates the relative conductivity of the water by comparing (by difference) the conductivity (reference conductivity, Cr) of the water introduced into the tub 3 and the conductivity (Cd) evaluated during the rinse stage. On the basis of this evaluation (block 39) and the water quantity used in this first rinse stage, the unit 15 operating (block 40) by fuzzy logic determines (block 41) the new water level to be used in the subsequent second rinse stage (block 42) after the water used in the preceding rinse stage has been discharged.
  • a suitable time period typically 180 seconds
  • the block 42 is followed by the blocks 43, 44, 45 and 46 which execute stages identical to and corresponding to the stages 38, 39, 40 and 41 respectively.
  • the evaluation of the water conductivity during stage 44 is done by comparing the conductivity (Cr) of the water introduced into the tub 3 (measured continuously by the sensor 14A) with that of the water present in the tub 3 after the second rinse.
  • This latter value is different from the corresponding value used in block 39 because the first rinse has already removed a large part of the detergent (responsible for the conductivity variation of the water coming into contact with the load after its washing, compared with the reference value Cr) from the clothes in the drum 2.
  • the conductivity of the water (or rather of the aqueous solution) present in the tub 3 is a value representative of the quantity of detergent dissolved in the water or of how much detergent remains associated with the clothes contained in the drum after their wash or after the preceding rinse stage. This value generally decreases with the successive rinses, but how it varies cannot be predefined with certainty. This value in fact depends on various variables such as the type of clothes fabric and the quantity and type of detergent introduced into the drawer 5.
  • the unit 15 executes for example stage 51 of the method shown in Figure 11.
  • the unit 15 acts on the solenoid valve 8 to close access to the drawer 5 by the water originating from at least one of the pipes 10, 11, and to feed it into the pipe 6 (this being shown by the block 52 of Figure 11). Following this, said unit operates at least one solenoid valve 12 or 13 (to feed water into the tub) and evaluates the water level in the tub 3 without operating the motor via the member 21. When a predetermined minimum level of water sufficient to enable its conductivity to be measured by the sensor 14 has been reached in said tub, the unit 15 returns the valve 8 to the position closing the pipe 6 to the water and enabling it to flow into the drawer 5.
  • This unit determines the value of the conductivity measured by the sensor 14 (block 54) and takes it as the reference value Cr.
  • the successive evaluations (blocks 39 and 44) of the difference between the measured or instantaneous value (Cd) and the reference value (C r ) can be carried out according to any known method.
  • FIG. 12 A further example of evaluating the water conductivity and its consequences for defining, in accordance with fuzzy logic, the water quantity to be used in each rinse subsequent to the first is given in Figures 12 to 14, in which parts corresponding to those of the already described figures are indicated by the same reference numerals.
  • the washing machine of Figure 12 is similar to that of Figure 1A, but is without the sensor 14A.
  • each rinse comprises a first phase "i” in which water is fed into the tub 3, a phase “a” in which the load is agitated (possibly comprising the phase "i") and a phase “ds” of predetermined duration during which this load is spun and the water discharged.
  • the conductivity undergoes considerable swings related to the "fall” of the water containing detergent (taken from the load) in the tub.
  • the load agitation phase commences (phase "a” in Figure 14) there is a first evaluation of the water conductivity measurement (block 13B of Figure 13).
  • the conductivity measured by the sensor 14 increases in accordance with an exponential law (curve X).
  • curve X an exponential law
  • the unit 15 analyzes the angle gamma ( ⁇ ) which the tangent Z to the curve X forms with a straight line P parallel to the conductivity axis passing through that point on the time axis at the commencement of the period subsequent to the instability phase "i", ie at the start of the period T1 (ie when the unit 15 detects a continuously increasing conductivity).
  • the aforesaid evaluation is executed in accordance with the flow diagram of Figure 13 and as indicated by the block 37A (or 42A) of Figure 12A.
  • This value is representative of the quantity of detergent present in the load before the start of the relative rinse stage and is used by the unit 15 to determine in accordance with fuzzy logic (and by procedures analogous to those described heretofore in relation to Figures 5A, B, C, D) the water quantity to be used for the next rinse.
  • the angle gamma is evaluated during each rinse. As can be seen from the aforesaid figures, the angle gamma (indicated by the subscripts 1, 2 and 3 depending on the rinse) tends to become increasingly larger (ie the angle alpha becomes increasingly smaller), this being representative of a decrease in the quantity of detergent removed from the load contained in the drum 2. Rinsing is halted on reaching the aforesaid situation leading to the block 13L of Figure 14 (this condition usually being reached at the third rinse). Alternatively, rinsing is halted after a predetermined time.
  • the value of the angle gamma (indirectly obtained from the angle alpha) is used by the unit 15 to determine by fuzzy logic the quantity of water to introduce into the tub for the operating stage following the preceding one in which said angle was calculated. This is done by taking into consideration the water quantity used in the preceding spin calculated by the rules of fuzzy logic (analogously to that shown in Figures 5A, B, C and D).
  • this determination is as accurate as possible and enables water utilization to be optimized during the entire wash and rinse cycle of the appliance. Said logic results in substantially continuous definition of the water quantity to be used in the washing machine for removing the detergent from the load without the need for approximations (generally in excess) which usually lead to a considerable wastage of water.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Claims (14)

  1. Procédé pour optimiser l'utilisation d'eau dans un lave-linge (1), un lave-linge - séchoir ou analogue pendant son utilisation, ledit lave-linge traitant une charge ou des vêtements placés dans un tambour (2) tournant à l'intérieur d'une cuve (3) entraínée par un moteur électrique, ledit traitement comprenant une étape de lavage et une pluralité d'étapes successives de rinçage, le poids de la charge dans le tambour (2) et la conductivité de l'eau de lavage et/ou de l'eau de l'une quelconque des étapes de rinçage étant évalués pour l'obtention d'au moins une définition de la quantité d'eau devant être utilisée pour le rinçage, cette évaluation étant effectuée conformément à la logique floue, caractérisé en ce que la détermination de la conductivité de l'eau, qui est représentative de la quantité de détergent absorbée par les vêtements, est exécutée lors de chaque étape de rinçage, cette évaluation permettant une détermination correcte de la quantité d'eau devant être introduite dans la cuve (3) de la machine pour l'exécution de chaque étape de rinçage suivante de manière à permettre une réduction de ladite quantité de détergent à une valeur inférieure à une valeur minimale prédéterminée, ladite quantité d'eau devant être introduite dans la cuve (3) étant calibrée en fonction de la quantité de détergent, qui est évaluée par la logique floue et est restée fixée à la charge après une étape précédente lors du traitement de cette charge.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on utilise une valeur correspondant à la quantité d'eau lors d'une étape de rinçage (37,42), en combinaison avec la valeur correspondant à la quantité de détergent présente lors dudit rinçage précédent, pour déterminer, conformément à la logique floue, la quantité d'eau devant être introduite dans la cuve (3) pour exécuter l'étape suivante de rinçage (42,47).
  3. Procédé selon la revendication 1, caractérisé en ce que l'évaluation, au moyen de la logique floue, de la quantité d'eau devant être utilisée au moins pour la première étape de rinçage (37) est exécutée sur la base du poids de la charge introduite dans le tambour rotatif (2) et est également évaluée conformément à cette logique.
  4. Procédé selon la revendication 3, caractérisé en ce que l'évaluation, au moyen de la logique floue, du poids de la charge est également utilisée pour définir la quantité d'eau devant être utilisée pour exécuter l'étape de lavage.
  5. Procédé selon la revendication 3 ou 4, caractérisé par la détermination, au moyen de la logique floue, d'une caractéristique du moteur électrique (31), sur la base de laquelle le poids de la charge placée dans le tambour (2) est déterminé, la valeur de ladite caractéristique étant utilisée par ladite logique pour déterminer successivement la quantité d'eau devant être introduite dans la cuve (3) pour le lavage de la charge (35) et/ou pour la première étape de rinçage (37).
  6. Procédé selon la revendication 1, caractérisé en ce qu'il comprend, à la suite du lavage de la charge (35), mais avant la première étape de rinçage (37), une étape suivante (34) d'évaluation, au moyen de la logique floue, du poids de la charge introduite dans le tambour.
  7. Procédé selon la revendication 1, caractérisé en ce qu'avant le lavage (35) et après l'étape (34) d'évaluation du poids de la charge, une étape (51) est exécutée, lors de laquelle la conductivité de l'eau introduite dans la cuve (3) est évaluée pour être prise en tant que valeur de référence.
  8. Procédé selon la revendication 1, caractérisé en ce que l'évaluation, au moyen de la logique floue, de la quantité de détergent dissoute dans l'eau à l'intérieur de la cuve (3) est exécutée au moyen d'une mesure de la conductivité de l'eau au moins lors du démarrage de chaque étape de rinçage (37,42).
  9. Dispositif pour la mise en oeuvre du procédé selon la revendication 1 dans un lave-linge du type comprenant une unité de commande (15) pour le programme de lavage de l'appareil et un moteur électrique pour faire tourner un tambour à l'intérieur d'une cuve, dans laquelle une eau de lavage est introduite, ladite unité de commande (15) étant connectée au moins à des moyens (14) pour mesurer la conductivité de l'eau, qui est venue, d'une manière définie, en contact avec les vêtements situés dans le tambour rotatif (2), caractérisé en ce que ladite unité de commande (15) fonctionne conformément aux règles de la logique floue pour évaluer la quantité d'eau nécessaire lors des étapes de lavage et/ou de rinçage, sur la base de la conductivité mesurée.
  10. Dispositif selon la revendication 9, caractérisé en ce qu'il comprend en outre des moyens (14a) pour mesurer la conductivité de l'eau qui a été introduite dans la cuve (3), mais n'est pas venue en contact avec les vêtements, lesdits moyens étant connectés à l'unité (4) fonctionnant conformément à la logique floue.
  11. Dispositif selon la revendication 9, caractérisé en ce qu'il comporte des moyens (16) pour mesurer un paramètre caractéristique du moteur électrique, connectés à l'unité (4) fonctionnant conformément aux règles de la logique floue, lesdits moyens (16) permettant à ladite unité d'évaluer le poids de la charge introduite dans le tambour rotatif (2).
  12. Dispositif selon la revendication 9, caractérisé en ce que les moyens (14) pour mesurer la conductivité de l'eau, qui vient en contact, d'une manière définie, avec la charge située dans le tambour rotatif (2) sont positionnés à l'intérieur de la cuve (3), à proximité de son fond.
  13. Dispositif selon la revendication 10, caractérisé en ce que les autres moyens de mesure de conductivité (14a) sont disposés dans une canalisation (7) servant à envoyer de l'eau à un tiroir usuel à détergent (5).
  14. Dispositif selon la revendication 10, caractérisé en ce qu'il comporte une canalisation (6) qui raccorde le fond de la cuve (3) à la canalisation (7) amenant l'eau au tiroir à détergent, tandis qu'au niveau de l'intersection entre lesdites canalisations il est prévu un élément de soupape commandé, agencé de manière à introduire l'eau initialement introduite dans la machine en direction dudit fond de la cuve (3), puis en direction dudit tiroir (5), et qu'en rapport avec ledit fond de la cuve sont disposés des moyens pour mesurer la conductivité de l'eau pénétrant dans la machine, puis la conductivité de l'eau qui est venue en contact avec la charge contenant le détergent.
EP94108840A 1994-06-09 1994-06-09 Procédé pour optimiser l'utilisation de l'eau dans les machines à laver Expired - Lifetime EP0686721B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP94108840A EP0686721B1 (fr) 1994-06-09 1994-06-09 Procédé pour optimiser l'utilisation de l'eau dans les machines à laver
DE69424409T DE69424409T2 (de) 1994-06-09 1994-06-09 Verfahren zum Optimieren der Wasserausnutzung in Waschmaschinen

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EP94108840A EP0686721B1 (fr) 1994-06-09 1994-06-09 Procédé pour optimiser l'utilisation de l'eau dans les machines à laver

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EP0686721A1 EP0686721A1 (fr) 1995-12-13
EP0686721B1 true EP0686721B1 (fr) 2000-05-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2243416A1 (fr) 2009-04-24 2010-10-27 Electrolux Home Products Corporation N.V. Procédé d'opération d'un lave-vaisselle

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2789568B1 (fr) * 1999-02-16 2001-05-04 Esswein Sa Procede d'optimisation du cycle de fonctionnement d'un appareil electromenager lavant et appareil utilisant ce procede
ES2177370B1 (es) * 1999-10-14 2004-08-16 Atyc Technological S.L. Aparato para tratamiento en humedo de materias textiles.
EP2057929B1 (fr) 2007-11-07 2009-07-22 Electrolux Home Products Corporation N.V. Lave-vaisselle avec mesure de conductivité
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EP2243416A1 (fr) 2009-04-24 2010-10-27 Electrolux Home Products Corporation N.V. Procédé d'opération d'un lave-vaisselle
EP2508113A1 (fr) 2009-04-24 2012-10-10 Electrolux Home Products Corporation N.V. Procédé d'opération d'un lave-vaisselle
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DE69424409T2 (de) 2000-11-02
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