EP1707663B1 - Method for controlling one or several parameters of a wash process and machine for such a method - Google Patents

Method for controlling one or several parameters of a wash process and machine for such a method Download PDF

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Publication number
EP1707663B1
EP1707663B1 EP06290510.4A EP06290510A EP1707663B1 EP 1707663 B1 EP1707663 B1 EP 1707663B1 EP 06290510 A EP06290510 A EP 06290510A EP 1707663 B1 EP1707663 B1 EP 1707663B1
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EP
European Patent Office
Prior art keywords
detergent
conductivity
washing
control method
rinsing
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EP06290510.4A
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German (de)
French (fr)
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EP1707663A1 (en
Inventor
Carène Tissot
Caroline Ulmer
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Groupe Brandt SAS
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Groupe Brandt SAS
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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
    • D06F34/22—Condition of the washing liquid, e.g. turbidity
    • 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 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/36—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of washing
    • 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
    • D06F2103/20—Washing liquid condition, e.g. turbidity
    • 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 method for controlling one or more parameters of a washing process.
  • It also relates to a washing machine, and especially to wash the laundry, washing machine type or washer-dryer for domestic use, adapted to implement the servo process according to the invention.
  • the present invention relates to the field of washing and aims to enslave one or more parameters of the washing process (washing, rinsing, spinning) to adapt it to the washing conditions.
  • the present invention thus aims in particular to improve the effectiveness of the washing or rinsing implemented.
  • Washing machines are already known which propose several washing programs, depending in particular on the type of textile to be washed.
  • washing programs are thus generally modified in terms of the duration of the washing phase, or else the maximum speed of rotation of the drum during a spinning phase between different rinsing phases.
  • these conventional washing processes generally comprise several intermediate spinning operations intended to evacuate a maximum of dirty water from the laundry between different rinsing phases.
  • the intermediate spinning are relatively long, between 5 and 8 minutes, and made at high speed of the rotary drum, of the order of 1050 revolutions / minute. These intermediate spinning have the disadvantage of accelerating the wear of the laundry and his rustling. They also cause significant noise, of the order of 70 dBA.
  • Washing machines are also known as described in the document US 5,241,845 which, depending on the type of detergent determined, change the duration of the washing phase.
  • the present invention aims to optimize the performance of a washing process while minimizing the consumption of water and energy, and possibly the noise constraints.
  • the present invention relates to a method of controlling one or more parameters of a washing process, according to a function depending at least on the type and / or the amount of detergent used in said washing process.
  • the parameters comprise an intermediate spinning time in a textile washing process and / or a maximum speed of rotation of a washing drum during an intermediate spin.
  • the Applicant has found that the type and / or amount of detergent used, which may be for example in the form of liquid, compact or dispersed powder, have a strong influence on the efficiency of the rinsing and washing.
  • the parameters of the washing process are chosen in particular from the duration of the washing or rinsing phases or the number of rinsing or dewatering phases.
  • control method comprises a step of determining the type and / or amount of detergent used in the washing process, this step of determination comprising a step of measuring the conductivity of a detergent bath.
  • the step of determining the type and / or amount of detergent used comprises a step of calculating a ratio of a predetermined value of the conductivity associated with the feedwater and the measured value of the conductivity of a detergent bath, and a step of comparing said ratio with one or more predetermined threshold values, thus making it possible to classify the detergent used in different categories of detergent
  • the value of the parameter (s) is set according to a further dependent function of at least the type of textile and the weight of textile to be washed.
  • this machine comprises in particular means for determining the type and / or the amount of detergent.
  • This washing machine has characteristics and advantages similar to those described above with reference to the control method that it implements.
  • This washing machine may be a household washing machine or a washer-dryer.
  • an overhead loading machine has been illustrated.
  • the present invention applies to all types of washing machine, including front loading.
  • such a washing machine 10 comprises a washing tub 11 and a drum 12 rotatably mounted, here along a horizontal axis 13, inside this washing tub 11.
  • a door (not shown) located on the upper face of the machine allows the user to access the inside of the tank and the drum to introduce or remove the laundry.
  • a control panel 14 is also provided in the upper part of the machine.
  • the washing machine comprises all the equipment and means necessary for the implementation of a conventional washing process in such a rotary drum machine.
  • control board 14 includes means for determining the type of detergent.
  • the user can indicate with a selection button the type of detergent used.
  • Illustrative here is a possible choice of detergent among a set comprising detergents in the form of liquid, gel, compacted powder (tablet) or dispersed.
  • the means for determining the type of detergent could be different as long as they are suitable for classifying the detergent among a set of detergents as described above.
  • a sensor placed in a detergent receiving pan could determine the type of detergent used automatically, without user intervention.
  • the user must then place the detergent in the tray.
  • the determination of the type and amount of detergent used can be carried out automatically, without user intervention, by means of a conductivity sensor 16 placed in the tank 11 and preferably at the bottom of the tank. The operation of this sensor 16 will be described later.
  • this sensor 16 makes it possible to periodically or continuously measure the conductivity of the washing or rinsing bath present in the tank.
  • the washing machine further comprises means for determining the type of textile 17, illustrated here, in a nonlimiting manner, by a selection button allowing the user to select the type of textile from a set consisting for example of cotton type , synthetic, wool.
  • the washing machine in this embodiment comprises means for determining the textile weight introduced into the drum.
  • This measurement of the weight can be performed by one of the known weight measuring means based on a pressure switch placed in relation to the tank. Depending on the electrical value measured at the terminals of this pressure switch, it is possible to determine the weight of the laundry introduced into the drum.
  • These textile weight determination means can be adapted to define load families associated with a weight range.
  • a first family CV1 corresponds to a textile load of between 0 and 2 kilos
  • a second family CV2 corresponds to a textile load of between 2 and 3 kilos
  • a third family CV3 corresponds to a textile load of between 3 and and 4 kilos
  • a fourth CV4 family corresponds to a textile load of between 4 and 5 kilos.
  • the sensors for measuring weight and conductivity described above and the selection buttons are connected to the input of a control circuit including in particular a micro processor adapted to implement from the different parameters measured the washing process.
  • This micro processor is particularly adapted to control the speed of rotation of the drum, the operation of the heating elements, the duration and succession of the different phases of washing, rinsing and wringing in the washing process, the feeding and the evacuation of the different washing or rinsing baths ...
  • This control circuit is preferably integrated on an electronic card placed at the control panel 14.
  • the servo-control method according to the invention is adapted to enslave the value of at least one parameter of the washing process according to at least the type and / or the amount of detergent used in the washing process. .
  • the number of rinsing phases in a conventional program may be different, and in particular greater than three.
  • the number of rinsing phases can be further determined by the control method itself.
  • the detergent in a washing process is generally introduced by the user at the beginning of the process, either directly into the drum 13 containing the laundry, or into a receiving tray provided for this purpose.
  • the determination of the type of detergent can be carried out directly by the user using the selector button 15 previously described.
  • this can be done automatically by measuring the conductivity of a detergent bath using the conductivity sensor 16.
  • the conductivity is measured by a sensor integrated in an oscillator assembly.
  • the frequency generated by this oscillator is proportional to the conductivity of the bath, so that the microprocessor of the electronic board can determine the conductivity of the bath from the frequency, or the period, of the signal measured at the output of the oscillator .
  • the signal period is represented as a function of time in seconds.
  • the conductivity increases slightly when the sensor is immersed in water and has a Y value.
  • the value Y of the conductivity of the water of the supply network is taken into account in the control method which will be described.
  • This value is measured and stored during a previous wash cycle during the last rinsing phase.
  • a default value can be further memorized to initialize the process. For example, this default value corresponds to a period of 1700 s.
  • the curve in solid line illustrates the evolution of the conductivity for a detergent in liquid form or gel, in an amount between 50 and 80 ml.
  • the dashed curve illustrates the change in conductivity for a detergent in the form of compacted powder in a quantity of 40 g.
  • the dashed thick line curve illustrates the change in conductivity for a dispersed powder detergent in an amount of about 100 g.
  • the continuous thick line curve illustrates the evolution of the conductivity for a detergent in powder form in an amount greater than 200 g, corresponding in practice to an overdose of the detergent.
  • the evolution of the conductivity thus illustrated corresponds to the beginning of a washing phase of a washing process.
  • the beginning of the washing process can be broken down as follows.
  • a first phase corresponds to filling the tank with water, the drum being stationary.
  • the detergent introduced into the receiving tank is thus entrained in the water of the tank.
  • a second phase corresponds to a mixing phase of water and lye, the drum being rotated so that the water is absorbed by the laundry and the detergent dissolves little by little.
  • a third phase is to add water into the tank, the drum being kept stationary.
  • the drum is also rotated during this fifth phase.
  • a conductivity measurement of the detergent bath can thus be carried out after the stirring phases, and for example after heating the detergent bath, for example at a temperature substantially equal to 30 ° C.
  • the microprocessor implements a step of calculating a ratio of this measured value Y 'of the conductivity of the detergent bath and the predetermined value Y of the conductivity associated with the feed water.
  • a comparison step of this ratio is then implemented according to different predetermined threshold values for classifying detergents.
  • threshold values are dependent on the value measured across the oscillator integrating the conductivity sensor and taken into account by the microprocessor.
  • predetermined threshold values can be calibrated during the manufacture of the machine, by tests and measurement routines accessible to those skilled in the art.
  • the detergent is of the liquid or gel type, hereinafter referred to as DT1.
  • This minimum threshold value is for example equal to 1.2.
  • the detergent used is a compacted powder, hereinafter referred to as DT2.
  • This average threshold value is for example equal to 1.5.
  • the detergent used is a dispersed powder, used at a normal dose of the order of 100 g, hereinafter referred to as DT3.
  • This maximum threshold value is for example equal to 3.5.
  • the detergent used is an overdosed dispersed powder, in an amount greater than for example 150 g, hereinafter referred to as DT4.
  • the method for determining the type of detergent and classification of detergents in the different categories DT1, DT2, DT3, DT4 is given here by way of non-limiting example.
  • the determination process could be refined by taking into account other conductivity measurements of the detergent bath at different times of the washing process, and for example taking into account a conductivity measurement made at the end of the second phase. , after stirring and before the third water booster phase, thus making it possible to discriminate the compacted powders from the dispersed powders as a function of their more or less rapid dissolution in the water.
  • the process for determining the type and amount of detergent is based on the fact that powdered detergents have a richer and more diverse composition than detergents in liquid form.
  • the liquid detergents are diluted regularly with each addition of water unlike detergents in the form of compacted powder which disintegrate before dissolving in the bath.
  • the classification carried out detergents DT1, DT2, DT3, DT4 allows in particular to classify detergents according to their speed of dissolution in water, from the fastest to the slowest.
  • one of the parameters that can be controlled by taking into account the type and / or the amount of detergent is the number of rinsing phases programmed in a washing process.
  • a theoretical washing process is programmed at the microprocessor level, when the user chooses a predefined program.
  • This predefined wash program generally takes into account the type of fabric to be washed, a user-specified wash temperature, and possibly other parameters.
  • control method can be adapted to reduce or increase the number of rinsing phases of the theoretical washing process.
  • the number of rinsing phases can be increased, for example by four, whereas, when the detergent is of the DT1 type, the number of phases of rinsing can be reduced, for example equal to two.
  • the theoretical duration programmed for each rinsing phase can be increased or decreased from the knowledge of the type of detergent used.
  • the servo-control method makes it possible to regulate parameters of an intermediate spin in a textile washing process.
  • an intermediate spinning has different levels of variable duration, corresponding to different speeds of rotation of the drum.
  • the intermediate spinning comprises a first phase of duration D1 for a rotational speed of the drum of the order of 800 revolutions / minute, then a second phase of duration D2 for a maximum speed V of rotation of the drum, illustrated in FIG. figure 3 at 1050 rpm.
  • the servo-control method thus makes it possible in particular to adjust the values of the parameters D1, D2 and V.
  • the parameter of duration D1 and / or D2 of intermediate spin can be set in the following manner.
  • the duration varies between a minimum threshold value for a washing textile weight of less than 2 kilograms (CV1 load) and a fast dissolving detergent (DT1) and a maximum threshold value for a weight of washing textile greater than 4 kilograms (CV4) and slow dissolving detergent (DT3).
  • the duration D1 can vary from 20 seconds for a load of the type CV1 and a detergent of the type DT1 to 120 seconds for a load of the type CV4 and a detergent of the type DT3.
  • the duration parameter D2 can vary from 20 seconds for a load type CV1 and a detergent type DT1 200 seconds for a CV4-type load and a detergent type DT3.
  • the maximum speed parameter V of rotation of the washing drum can also be regulated by the servo-control method.
  • This rotation parameter V can vary between a minimum threshold value for a weight of textile to be washed less than 2 kilos (type CV1 load) and a fast dissolving detergent (DT1) and a maximum threshold value for a textile weight washing greater than 4 kilograms (CV4 type charge) and slow dissolving detergent (DT3).
  • the speed V can vary from 1050 revolutions / minute for a CV3-type load and a DT3-type detergent at 800 revolutions / minute for a load of the type CV1 and a detergent of the type DT1.
  • the maximum speed can be limited to 800 revolutions / minute for example, to avoid the large creation of foam.
  • the servo-control method can also take into account different periodic measurements of the conductivity of a rinsing bath using the conductivity sensor 16 described above.
  • the method of servocontrol from a periodic measurement of the conductivity of a rinsing bath during a rinsing phase implements a step of comparing the conductivity values measured periodically and successively, in order to determine the end a rinsing phase when at least two consecutive conductivity measurements are substantially identical.
  • the ideal brewing time of a rinsing phase corresponds to the moment when there is a balance between the concentration of detergent in the rinsing bath and that contained in the laundry, any additional extraction of detergent being then impossible.
  • this equilibrium phase results in a conductivity value of the rinsing bath which no longer evolves. Also, by calculating the difference between two successive values of conductivity measurement, with a predetermined periodicity of the order of 1 minute for example, it is possible to determine a rinse phase end when this difference is less than a threshold value. prefixed.
  • This servo-control method thus makes it possible to reduce the theoretical or predetermined duration at the beginning of a washing process as indicated above, to take account of the actual evolution of the rinsing phase.
  • control method is adapted, from the measurement of the conductivity of a rinsing bath during a rinsing phase, to compare the value of the measured conductivity with the predetermined value Y of the conductivity associated with the rinsing phase. feed water, to identify the penultimate rinse required.
  • This test is based on the principle that the higher the conductivity value measured in the rinse bath is close to the Y conductivity value of the feed water, the less detergent is removed from the laundry. By comparing the conductivity of the water in a rinse bath at the end of each rinse phase, it is possible to determine whether the next rinse can be the last rinse.
  • a last rinsing phase is used, during which a softener may optionally be introduced.
  • This servo-control method also serves to control the number of theoretical or predetermined rinse phases at the beginning of the washing process as indicated above.
  • the present invention thus makes it possible, by measuring the conductivity of the rinsing and washing baths throughout a washing process, to control various parameters of this washing process in order, in particular, to limit the mechanical stresses on the laundry and to limit the acoustic nuisance.
  • the invention has been described for a washing machine. It can also be applied to a dishwasher, the servo process being adapted to adjust for example the duration of the washing phase or the number and duration of the rinsing phases depending on the type and / or quantity of detergent used.

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

Description

- La présente invention concerne un procédé d'asservissement d'un ou plusieurs paramètres d'un processus de lavage.The present invention relates to a method for controlling one or more parameters of a washing process.

Elle concerne également une machine à laver, et notamment à laver le linge, du type lave-linge ou lavante-séchante à usage domestique, adaptée à mettre en oeuvre le procédé d'asservissement conforme à l'invention.It also relates to a washing machine, and especially to wash the laundry, washing machine type or washer-dryer for domestic use, adapted to implement the servo process according to the invention.

De manière générale, la présente invention concerne le domaine du lavage et vise à asservir un ou plusieurs paramètres du processus de lavage (lavage, rinçage, essorage) pour adapter celui-ci aux conditions de lavage.In general, the present invention relates to the field of washing and aims to enslave one or more parameters of the washing process (washing, rinsing, spinning) to adapt it to the washing conditions.

La présente invention vise ainsi en particulier à améliorer l'efficacité du lavage ou du rinçage mis en oeuvre.The present invention thus aims in particular to improve the effectiveness of the washing or rinsing implemented.

On connaît déjà des machines à laver le linge qui proposent plusieurs programmes de lavage, dépendant en particulier du type de textile à laver.Washing machines are already known which propose several washing programs, depending in particular on the type of textile to be washed.

Ces programmes de lavage sont ainsi généralement modifiés en terme de durée de la phase de lavage, ou bien encore de vitesse maximale de rotation du tambour lors d'une phase d'essorage entre différentes phases de rinçage.These washing programs are thus generally modified in terms of the duration of the washing phase, or else the maximum speed of rotation of the drum during a spinning phase between different rinsing phases.

Par ailleurs, ces processus de lavage classiques comportent généralement plusieurs essorages intermédiaires destinés à évacuer un maximum d'eau sale du linge entre différentes phases de rinçage.In addition, these conventional washing processes generally comprise several intermediate spinning operations intended to evacuate a maximum of dirty water from the laundry between different rinsing phases.

En effet, plus la quantité d'eau évacuée à chaque phase de rinçage est importante, plus la quantité de détergent extrait du textile au bain de rinçage suivant est importante, et par conséquent meilleur sera le résultat de rinçage.Indeed, the greater the amount of water discharged in each rinsing phase is important, the greater the amount of detergent extracted from the textile rinse bath following is important, and therefore will be the best rinse result.

Aussi, dans les machines à laver le linge actuelles, les essorages intermédiaires sont-ils relativement longs, entre 5 et 8 minutes, et réalisés à vitesse élevée du tambour rotatif, de l'ordre de 1050 tours/minutes. Ces essorages intermédiaires présentent l'inconvénient d'accélérer l'usure du linge et son froissement. Ils provoquent en outre des nuisances sonores importantes, de l'ordre de 70 dBA.Also, in current washing machines, the intermediate spinning are relatively long, between 5 and 8 minutes, and made at high speed of the rotary drum, of the order of 1050 revolutions / minute. These intermediate spinning have the disadvantage of accelerating the wear of the laundry and his rustling. They also cause significant noise, of the order of 70 dBA.

On connaît également des machines à laver le linge telles que décrites dans le document US 5 241 845 qui, en fonction du type de détergent déterminé, modifient la durée de la phase de lavage.Washing machines are also known as described in the document US 5,241,845 which, depending on the type of detergent determined, change the duration of the washing phase.

La présente invention a pour but d'optimiser les performances d'un processus de lavage tout en minimisant les consommations d'eau et d'énergie, ainsi qu'éventuellement les contraintes sonores.The present invention aims to optimize the performance of a washing process while minimizing the consumption of water and energy, and possibly the noise constraints.

A cet effet, la présente invention concerne un procédé d'asservissement d'un ou plusieurs paramètres d'un processus de lavage, suivant une fonction dépendante au moins du type et/ou de la quantité de détergent utilisé dans ledit processus de lavage.To this end, the present invention relates to a method of controlling one or more parameters of a washing process, according to a function depending at least on the type and / or the amount of detergent used in said washing process.

Selon l'invention, les paramètres comprennent une durée d'essorage intermédiaire dans un processus de lavage de textile et/ou une vitesse maximale de rotation d'un tambour de lavage pendant un essorage intermédiaire.According to the invention, the parameters comprise an intermediate spinning time in a textile washing process and / or a maximum speed of rotation of a washing drum during an intermediate spin.

La Demanderesse a constaté que le type et/ou de la quantité de détergent utilisé, qui peut être par exemple sous forme de liquide, de poudre compacte ou dispersée, influent fortement sur l'efficacité du rinçage et du lavage.The Applicant has found that the type and / or amount of detergent used, which may be for example in the form of liquid, compact or dispersed powder, have a strong influence on the efficiency of the rinsing and washing.

Il est ainsi possible d'adapter la durée et la vitesse d'essorage au type de détergent utilisé.It is thus possible to adapt the duration and speed of spinning to the type of detergent used.

En adaptant un paramètre du processus de lavage au type et/ou de la quantité de détergent utilisé, il est possible d'asservir le procédé de lavage au mieux et de limiter ainsi les contraintes mécaniques au strict nécessaire. Outre la durée et/ou la vitesse de rotation du tambour d'un essorage intermédiaire, les paramètres du processus de lavage sont choisis notamment parmi la durée des phases de lavage ou de rinçage ou le nombre de phases de rinçage ou d'essorage.By adapting a parameter of the washing process to the type and / or quantity of detergent used, it is possible to enslave the washing process in the best possible manner and thus to limit the mechanical stresses to the strict minimum necessary. In addition to the duration and / or the rotation speed of the drum of an intermediate spin, the parameters of the washing process are chosen in particular from the duration of the washing or rinsing phases or the number of rinsing or dewatering phases.

Selon une réalisation pratique de l'invention, le procédé d'asservissement comprend une étape de détermination du type et/ou de la quantité de détergent utilisé dans le processus de lavage, cette étape de détermination comprenant une étape de mesure de la conductivité d'un bain lessiviel.According to a practical embodiment of the invention, the control method comprises a step of determining the type and / or amount of detergent used in the washing process, this step of determination comprising a step of measuring the conductivity of a detergent bath.

Il est ainsi possible à partir de la mesure de la conductivité d'un bain de lavage dans lequel le détergent a été introduit, de discriminer le type de détergent utilisé et notamment de séparer les détergents liquides des détergents en poudre, ainsi qu'éventuellement de classifier le détergent en fonction de la quantité de détergent utilisé.It is thus possible from the measurement of the conductivity of a washing bath into which the detergent has been introduced, to discriminate the type of detergent used and in particular to separate the liquid detergents from the detergents in powder form, as well as possibly from classify the detergent according to the amount of detergent used.

En pratique, l'étape de détermination du type et/ou de la quantité de détergent utilisé comprend une étape de calcul d'un ratio d'une valeur prédéterminée de la conductivité associée à l'eau d'alimentation et de la valeur mesurée de la conductivité d'un bain lessiviel, et une étape de comparaison dudit ratio avec une ou plusieurs valeurs de seuil prédéterminées, permettant ainsi de classifier le détergent utilisé dans différentes catégories de détergentIn practice, the step of determining the type and / or amount of detergent used comprises a step of calculating a ratio of a predetermined value of the conductivity associated with the feedwater and the measured value of the conductivity of a detergent bath, and a step of comparing said ratio with one or more predetermined threshold values, thus making it possible to classify the detergent used in different categories of detergent

Lorsque l'invention est appliquée au lavage de textile, de préférence la valeur du ou des paramètres est fixée suivant une fonction dépendante en outre au moins du type de textile et du poids de textile à laver.When the invention is applied to textile washing, preferably the value of the parameter (s) is set according to a further dependent function of at least the type of textile and the weight of textile to be washed.

Selon une autre caractéristique de l'invention, le procédé d'asservissement comprend en outre les étapes suivantes :

  • mesure périodique de la conductivité d'un bain de rinçage pendant une phase de rinçage ;
  • comparaison des valeurs de conductivité mesurées périodiquement ; et
  • détermination de la fin d'une phase de rinçage lorsqu'au moins deux mesures consécutives de conductivité sont sensiblement identiques.
According to another characteristic of the invention, the servo-control method further comprises the following steps:
  • periodic measurement of the conductivity of a rinsing bath during a rinsing phase;
  • comparison of the measured conductivity values periodically; and
  • determining the end of a rinsing phase when at least two consecutive conductivity measurements are substantially identical.

Ainsi, à partir d'une mesure de la conductivité d'un bain de rinçage, il est possible d'asservir au mieux la durée de ce bain de rinçage, et en particulier d'arrêter une phase de rinçage lorsque celle-ci n'est plus efficace sur le plan de l'extraction du détergent du textile.Thus, from a measurement of the conductivity of a rinsing bath, it is possible to better control the duration of this rinsing bath, and in particular to stop a rinsing phase when it does not. is more effective in extracting the detergent from the textile.

Par ailleurs, selon une autre caractéristique pratique de l'invention, le procédé d'asservissement comprend les étapes suivantes :

  • mesure de la conductivité d'un bain de rinçage pendant une phase de rinçage ;
  • comparaison de la conductivité mesurée avec une valeur prédéterminée de la conductivité associée à l'eau d'alimentation ; et
  • mise en oeuvre d'une dernière phase de rinçage lorsque la valeur de conductivité mesurée est sensiblement égale à la valeur prédéterminée de la conductivité de l'eau d'alimentation.
Furthermore, according to another practical feature of the invention, the servo-control method comprises the following steps:
  • measuring the conductivity of a rinsing bath during a rinsing phase;
  • comparing the measured conductivity with a predetermined value of the conductivity associated with the feedwater; and
  • implementing a last rinsing phase when the measured conductivity value is substantially equal to the predetermined value of the conductivity of the feed water.

En comparant ainsi la conductivité d'un bain de rinçage avec la conductivité de l'eau d'alimentation du réseau, on peut déterminer au mieux la nécessité de mettre en oeuvre ou pas des phases de rinçage complémentaires, et ainsi diminuer le temps global du processus de lavage, et la consommation en eau, tout en assurant un rinçage efficace.By thus comparing the conductivity of a rinsing bath with the conductivity of the supply water of the network, it is possible to best determine the need to implement or not complementary rinsing phases, and thus reduce the overall time of the rinsing bath. washing process, and water consumption, while ensuring an effective rinsing.

Selon un second aspect de l'invention, elle concerne une machine à laver adaptée à mettre en oeuvre le procédé d'asservissement conforme à l'invention. Cette machine comprend en particulier des moyens de détermination du type et/ou de la quantité de détergent.According to a second aspect of the invention, it relates to a washing machine adapted to implement the servo method according to the invention. This machine comprises in particular means for determining the type and / or the amount of detergent.

Cette machine à laver présente des caractéristiques et avantages analogues à ceux décrits précédemment en référence au procédé d'asservissement qu'elle met en oeuvre.This washing machine has characteristics and advantages similar to those described above with reference to the control method that it implements.

D'autres particularités et avantages de l'invention apparaîtront encore dans la description ci-après.Other features and advantages of the invention will become apparent in the description below.

Aux dessins annexés, donnés à titre d'exemples non limitatifs :

  • la figure 1 illustre une machine à laver le linge adaptée à mettre en oeuvre le procédé d'asservissement conforme à l'invention ;
  • la figure 2 est une courbe illustrant l'évolution de la conductivité d'un bain lessiviel pour différents types et/ou quantité de détergent ; et
  • la figure 3 est une courbe illustrant le profil de la vitesse de rotation d'un tambour sur la durée d'un essorage intermédiaire.
In the accompanying drawings, given as non-limiting examples:
  • the figure 1 illustrates a washing machine adapted to implement the slaving method according to the invention;
  • the figure 2 is a curve illustrating the evolution of the conductivity of a detergent bath for different types and / or quantity of detergent; and
  • the figure 3 is a curve illustrating the profile of the speed of rotation of a drum over the duration of an intermediate spin.

On va décrire tout d'abord en référence à la figure 1 une machine à laver le linge 10 adaptée à mettre en oeuvre la présente invention.We will first describe with reference to the figure 1 a washing machine 10 adapted to implement the present invention.

Cette machine à laver le linge peut être une machine à laver le linge à usage domestique ou une lavante-séchante.This washing machine may be a household washing machine or a washer-dryer.

On a illustré sur ce mode de réalisation une machine à chargement par le dessus. Bien entendu, la présente invention s'applique à tous types de machine à laver, et notamment à chargement frontal.In this embodiment, an overhead loading machine has been illustrated. Of course, the present invention applies to all types of washing machine, including front loading.

De manière classique, une telle machine à laver 10 comprend une cuve de lavage 11 et un tambour 12 monté en rotation, ici suivant un axe horizontal 13, à l'intérieur de cette cuve de lavage 11.In a conventional manner, such a washing machine 10 comprises a washing tub 11 and a drum 12 rotatably mounted, here along a horizontal axis 13, inside this washing tub 11.

Une porte (non représentée) située sur la face supérieure de la machine permet à l'utilisateur d'avoir accès à l'intérieur de la cuve et du tambour pour introduire ou retirer le linge.A door (not shown) located on the upper face of the machine allows the user to access the inside of the tank and the drum to introduce or remove the laundry.

Un tableau de commande 14 est également prévu en partie supérieure de la machine.A control panel 14 is also provided in the upper part of the machine.

Seuls les moyens spécifiques à la mise en oeuvre du procédé d'asservissement conforme à l'invention seront décrits ci-après.Only the specific means for implementing the servo-control method according to the invention will be described hereinafter.

Bien entendu, le lave-linge conforme à l'invention comporte l'ensemble des équipements et moyens nécessaires à la mise en oeuvre d'un processus de lavage classique dans une telle machine à tambour rotatif.Of course, the washing machine according to the invention comprises all the equipment and means necessary for the implementation of a conventional washing process in such a rotary drum machine.

En particulier, dans ce mode de réalisation, le tableau de commande 14 comprend des moyens de détermination 15 du type de détergent.In particular, in this embodiment, the control board 14 includes means for determining the type of detergent.

Ainsi, l'utilisateur peut indiquer à l'aide d'un bouton de sélection le type de détergent utilisé.Thus, the user can indicate with a selection button the type of detergent used.

On a illustré ici à titre indicatif un choix possible de détergent parmi un ensemble comprenant des détergents sous forme de liquide, de gel, de poudre compactée (tablette) ou dispersée.Illustrative here is a possible choice of detergent among a set comprising detergents in the form of liquid, gel, compacted powder (tablet) or dispersed.

Bien entendu, la présente invention n'est pas limitée à ce type de détergent et peut s'appliquer à toute autre présentation.Of course, the present invention is not limited to this type of detergent and can be applied to any other presentation.

Par ailleurs, les moyens de détermination du type de détergent pourraient être différents dès lors qu'ils sont adaptés à classifier le détergent parmi un ensemble de détergents tel que décrit précédemment.Furthermore, the means for determining the type of detergent could be different as long as they are suitable for classifying the detergent among a set of detergents as described above.

En particulier, un capteur placé dans un bac de réception du détergent pourrait permettre de déterminer le type de détergent utilisé automatiquement, sans intervention de l'utilisateur.In particular, a sensor placed in a detergent receiving pan could determine the type of detergent used automatically, without user intervention.

L'utilisateur doit alors placer le détergent dans le bac.The user must then place the detergent in the tray.

En outre, la détermination du type et de la quantité de détergent utilisé peut être réalisée automatiquement, sans intervention de l'utilisateur, grâce à un capteur de conductivité 16 placé dans la cuve 11 et de préférence en fond de cuve. Le fonctionnement de ce capteur 16 sera décrit ultérieurement.In addition, the determination of the type and amount of detergent used can be carried out automatically, without user intervention, by means of a conductivity sensor 16 placed in the tank 11 and preferably at the bottom of the tank. The operation of this sensor 16 will be described later.

En particulier, ce capteur 16 permet de mesurer périodiquement ou en continu la conductivité du bain de lavage ou de rinçage présent dans la cuve.In particular, this sensor 16 makes it possible to periodically or continuously measure the conductivity of the washing or rinsing bath present in the tank.

La machine à laver comprend en outre des moyens de détermination du type de textile 17, illustrés ici, de manière non limitative, par un bouton de sélection permettant à l'utilisateur de sélectionner le type de textile parmi un ensemble constitué par exemple du type coton, synthétique, laine.The washing machine further comprises means for determining the type of textile 17, illustrated here, in a nonlimiting manner, by a selection button allowing the user to select the type of textile from a set consisting for example of cotton type , synthetic, wool.

Enfin, la machine à laver dans ce mode de réalisation comprend des moyens de détermination du poids de textile introduit dans le tambour.Finally, the washing machine in this embodiment comprises means for determining the textile weight introduced into the drum.

Cette mesure du poids peut être effectuée par un des moyens de mesure de poids connus à base d'un pressostat placé en relation avec la cuve. En fonction de la valeur électrique mesurée aux bornes de ce pressostat, il est possible de déterminer le poids de linge introduit dans le tambour.This measurement of the weight can be performed by one of the known weight measuring means based on a pressure switch placed in relation to the tank. Depending on the electrical value measured at the terminals of this pressure switch, it is possible to determine the weight of the laundry introduced into the drum.

Ces moyens de détermination du poids de textile peuvent être adaptés à définir des familles de charge associées à un intervalle de poids.These textile weight determination means can be adapted to define load families associated with a weight range.

Par exemple, une première famille CV1 correspond à une charge de textile comprise entre 0 et 2 kilos, une deuxième famille CV2 correspond à une charge de textile comprise entre 2 et 3 kilos, une troisième famille CV3 correspond à une charge de textile comprise entre 3 et 4 kilos et une quatrième famille CV4 correspond à une charge de textile comprise entre 4 et 5 kilos.For example, a first family CV1 corresponds to a textile load of between 0 and 2 kilos, a second family CV2 corresponds to a textile load of between 2 and 3 kilos, a third family CV3 corresponds to a textile load of between 3 and and 4 kilos and a fourth CV4 family corresponds to a textile load of between 4 and 5 kilos.

Bien entendu, ces valeurs sont données à titre d'exemples et ne sont nullement limitatives.Of course, these values are given by way of examples and are in no way limiting.

Les capteurs de mesure de poids et de conductivité décrits précédemment et les boutons de sélection sont reliés en entrée d'un circuit de commande comprenant notamment un micro processeur adapté à mettre en oeuvre à partir des différents paramètres mesurés le processus de lavage. Ce micro processeur est notamment adapté à commander la vitesse de rotation du tambour, le fonctionnement des éléments de chauffage, la durée et la succession des différentes phases de lavage, de rinçage et d'essorage dans le processus de lavage, l'alimentation et l'évacuation des différents bains de lavage ou de rinçage ...The sensors for measuring weight and conductivity described above and the selection buttons are connected to the input of a control circuit including in particular a micro processor adapted to implement from the different parameters measured the washing process. This micro processor is particularly adapted to control the speed of rotation of the drum, the operation of the heating elements, the duration and succession of the different phases of washing, rinsing and wringing in the washing process, the feeding and the evacuation of the different washing or rinsing baths ...

Ce circuit de commande est de préférence intégré sur une carte électronique placée au niveau du tableau de commande 14.This control circuit is preferably integrated on an electronic card placed at the control panel 14.

On va décrire à présent le procédé d'asservissement mis en oeuvre dans une machine à laver le linge telle que décrite précédemment.We will now describe the servo process implemented in a washing machine as described above.

Dans son principe, le procédé d'asservissement conforme à l'invention est adapté à asservir la valeur d'au moins un paramètre du processus de lavage en fonction au moins du type et/ou de la quantité de détergent utilisé dans le processus de lavage.In principle, the servo-control method according to the invention is adapted to enslave the value of at least one parameter of the washing process according to at least the type and / or the amount of detergent used in the washing process. .

De manière générale, un processus de lavage peut se découper de la manière suivante :

  • une phase de lavage (éventuellement précédée d'une phase de prélavage) ;
  • un essorage intermédiaire ;
  • une première phase de rinçage ;
  • un essorage intermédiaire ;
  • une deuxième phase de rinçage ;
  • un essorage intermédiaire ;
  • une dernière phase de rinçage ; et
  • un essorage final.
In general, a washing process can be broken down as follows:
  • a washing phase (possibly preceded by a prewash phase);
  • an intermediate spin;
  • a first rinsing phase;
  • an intermediate spin;
  • a second rinsing phase;
  • an intermediate spin;
  • a final rinse phase; and
  • a final spin.

Bien entendu, le nombre de phases de rinçage dans un programme classique peut être différent, et en particulier supérieur à trois.Of course, the number of rinsing phases in a conventional program may be different, and in particular greater than three.

Comme on va le voir ci-après, le nombre de phases de rinçage peut en outre être déterminé par le procédé d'asservissement lui-même.As will be seen below, the number of rinsing phases can be further determined by the control method itself.

On va décrire tout d'abord dans le cadre du procédé d'asservissement conforme à l'invention, le procédé de détermination du type et/ou de la quantité de détergent utilisé dans le processus de lavage.The method of determining the type and / or amount of detergent used in the washing process will first be described in the context of the servo-control method according to the invention.

A ce jour, il existe sur le marché différents types de détergent utilisable, et notamment des détergents liquides, des détergents sous forme de gel encapsulé, et des détergents en poudre dispersée, ou compactée sous forme de tablettes.To date, there are various types of usable detergents on the market, including liquid detergents, detergents in the form of gel encapsulated, and dispersed powder detergents, or compacted in the form of tablets.

Bien entendu, la présente invention n'est pas limitée aux formes précitées de détergent.Of course, the present invention is not limited to the aforementioned forms of detergent.

Le détergent dans un processus de lavage est généralement introduit par l'utilisateur en début du processus, soit directement dans le tambour 13 contenant le linge, ou dans un bac de réception prévu à cet effet.The detergent in a washing process is generally introduced by the user at the beginning of the process, either directly into the drum 13 containing the laundry, or into a receiving tray provided for this purpose.

La détermination du type de détergent peut être réalisée directement par l'utilisateur à l'aide du bouton de sélection 15 décrit précédemment.The determination of the type of detergent can be carried out directly by the user using the selector button 15 previously described.

De préférence, celle-ci peut être réalisée de manière automatique grâce à la mesure de la conductivité d'un bain lessiviel à l'aide du capteur de conductivité 16.Preferably, this can be done automatically by measuring the conductivity of a detergent bath using the conductivity sensor 16.

A cet égard, on a illustré sur la figure 2 à titre d'exemple non limitatif l'évolution de la conductivité d'un bain de lavage, en fonction du type de détergent utilisé et de son dosage.In this respect, we have illustrated on the figure 2 by way of non-limiting example the evolution of the conductivity of a washing bath, depending on the type of detergent used and its dosage.

Dans ce mode de réalisation pratique, la conductivité est mesurée grâce à un capteur intégré dans un ensemble oscillateur. La fréquence générée par cet oscillateur est proportionnelle à la conductivité du bain, de telle sorte que le microprocesseur de la carte électronique peut déterminer la conductivité du bain à partir de la fréquence, ou de la période, du signal mesuré en sortie de l'oscillateur.In this practical embodiment, the conductivity is measured by a sensor integrated in an oscillator assembly. The frequency generated by this oscillator is proportional to the conductivity of the bath, so that the microprocessor of the electronic board can determine the conductivity of the bath from the frequency, or the period, of the signal measured at the output of the oscillator .

On a représenté sur la figure 2 schématiquement la valeur de la conductivité mesurée par le capteur immergé dans différents bains lessiviels.We have shown on the figure 2 schematically the value of the conductivity measured by the sensor immersed in different detergent baths.

Ici, la période du signal est représentée en fonction du temps en seconde.Here, the signal period is represented as a function of time in seconds.

A titre indicatif, on a illustré la valeur Y0 du capteur dans l'air.As an indication, the Y0 value of the sensor in the air has been illustrated.

La conductivité augmente légèrement lorsque le capteur est immergé dans l'eau et présente une valeur Y.The conductivity increases slightly when the sensor is immersed in water and has a Y value.

La valeur Y de la conductivité de l'eau du réseau d'alimentation est prise en compte dans le procédé d'asservissement qui va être décrit.The value Y of the conductivity of the water of the supply network is taken into account in the control method which will be described.

Cette valeur est mesurée et mémorisée lors d'un cycle de lavage précédent, au cours de la dernière phase de rinçage.This value is measured and stored during a previous wash cycle during the last rinsing phase.

Une valeur par défaut peut être en outre mémorisée pour initialiser le processus. Cette valeur par défaut correspond par exemple ici à une période de 1700 s.A default value can be further memorized to initialize the process. For example, this default value corresponds to a period of 1700 s.

On a ensuite illustré pour différents types et quantités de détergent l'évolution de la conductivité dans le bain lessiviel.The evolution of the conductivity in the detergent bath was then illustrated for different types and amounts of detergent.

Ainsi, la courbe en trait continu illustre l'évolution de la conductivité pour un détergent sous forme liquide ou de gel, dans une quantité comprise entre 50 et 80 ml.Thus, the curve in solid line illustrates the evolution of the conductivity for a detergent in liquid form or gel, in an amount between 50 and 80 ml.

La courbe en trait pointillé illustre l'évolution de la conductivité pour un détergent sous forme de poudre compactée dans une quantité de 40 g.The dashed curve illustrates the change in conductivity for a detergent in the form of compacted powder in a quantity of 40 g.

La courbe en trait épais pointillé illustre l'évolution de la conductivité pour un détergent sous forme de poudre dispersée en quantité d'environ 100 g.The dashed thick line curve illustrates the change in conductivity for a dispersed powder detergent in an amount of about 100 g.

Enfin, la courbe en trait épais continu illustre l'évolution de la conductivité pour un détergent sous forme de poudre dans une quantité supérieure à 200 g, correspondant en pratique à un surdosage du détergent.Finally, the continuous thick line curve illustrates the evolution of the conductivity for a detergent in powder form in an amount greater than 200 g, corresponding in practice to an overdose of the detergent.

L'évolution de la conductivité ainsi illustrée correspond au début d'une phase de lavage d'un processus de lavage. Le début du processus de lavage peut se décomposer de la manière suivante.The evolution of the conductivity thus illustrated corresponds to the beginning of a washing phase of a washing process. The beginning of the washing process can be broken down as follows.

Une première phase correspond au remplissage en eau de la cuve, le tambour étant immobile. Le détergent introduit dans le bac de réception est ainsi entraîné dans l'eau de la cuve. On observe alors une montée brutale de la conductivité qui correspond au passage du détergent dans le bain de lavage.A first phase corresponds to filling the tank with water, the drum being stationary. The detergent introduced into the receiving tank is thus entrained in the water of the tank. There is then a sudden rise in the conductivity which corresponds to the passage of the detergent in the wash bath.

Une deuxième phase correspond à une phase de mélange de l'eau et de la lessive, le tambour étant entraîné en rotation de telle sorte que l'eau est absorbée par le linge et que le détergent se dissout petit à petit.A second phase corresponds to a mixing phase of water and lye, the drum being rotated so that the water is absorbed by the laundry and the detergent dissolves little by little.

On remarquera à cet égard qu'un détergent liquide se dissout relativement progressivement dans l'eau. Par ailleurs, la dissolution d'un détergent en poudre compacté (tablette) est relativement plus longue que celle d'une poudre dispersée.It should be noted in this respect that a liquid detergent dissolves relatively gradually in water. On the other hand, the dissolution of a compacted powder detergent (tablet) is relatively longer than that of a dispersed powder.

Après ce brassage, une troisième phase consiste à ajouter de l'eau dans la cuve, le tambour étant maintenu immobile.After this mixing, a third phase is to add water into the tank, the drum being kept stationary.

Puis une quatrième phase avec brassage à froid et différents ajouts d'eau est mise en oeuvre, le tambour étant entraîné à faible vitesse de rotation. Le mélange d'eau et de détergent s'homogénéise peu à peu.Then a fourth phase with cold stirring and different additions of water is implemented, the drum being driven at low rotational speed. The mixture of water and detergent gradually becomes homogeneous.

Enfin, une cinquième phase de brassage est mise en oeuvre avec démarrage du chauffage de l'eau.Finally, a fifth brewing phase is implemented with the start of heating the water.

Le tambour est également entraîné en rotation pendant cette cinquième phase.The drum is also rotated during this fifth phase.

Une mesure de conductivité du bain lessiviel peut ainsi être réalisée après les phases de brassage, et par exemple après chauffage du bain lessiviel, par exemple à une température sensiblement égale à 30° C.A conductivity measurement of the detergent bath can thus be carried out after the stirring phases, and for example after heating the detergent bath, for example at a temperature substantially equal to 30 ° C.

On obtient ainsi une mesure de conductivité Y', cette valeur de conductivité présentant une valeur différente en fonction du type et de la quantité de détergent utilisé.A conductivity measurement Y 'is thus obtained, this conductivity value having a different value depending on the type and quantity of detergent used.

En pratique, le microprocesseur met en oeuvre une étape de calcul d'un ratio de cette valeur mesurée Y' de la conductivité du bain lessiviel et de la valeur prédéterminée Y de la conductivité associée à l'eau d'alimentation.In practice, the microprocessor implements a step of calculating a ratio of this measured value Y 'of the conductivity of the detergent bath and the predetermined value Y of the conductivity associated with the feed water.

Une étape de comparaison de ce ratio est ensuite mise en oeuvre en fonction de différentes valeurs de seuil prédéterminées permettant de classifier les détergents.A comparison step of this ratio is then implemented according to different predetermined threshold values for classifying detergents.

Ces valeurs de seuil sont dépendantes de la valeur mesurée aux bornes de l'oscillateur intégrant le capteur de conductivité et prise en compte par le microprocesseur.These threshold values are dependent on the value measured across the oscillator integrating the conductivity sensor and taken into account by the microprocessor.

Ces valeurs de seuil prédéterminées peuvent être étalonnées lors de la fabrication de la machine, par des tests et des routines de mesure accessibles à l'homme du métier.These predetermined threshold values can be calibrated during the manufacture of the machine, by tests and measurement routines accessible to those skilled in the art.

En pratique, lorsque le ratio Y/Y' est inférieur à une valeur de seuil minimale, le détergent est du type liquide ou gel, dénommé ci-après DT1. Cette valeur de seuil minimale est par exemple égale à 1,2.In practice, when the ratio Y / Y 'is less than a minimum threshold value, the detergent is of the liquid or gel type, hereinafter referred to as DT1. This minimum threshold value is for example equal to 1.2.

Lorsque le ratio Y/Y' est compris entre cette valeur de seuil minimale et une valeur de seuil moyenne, le détergent utilisé est une poudre compactée, dénommé ci-après DT2. Cette valeur de seuil moyenne est par exemple égale à 1,5.When the Y / Y 'ratio is between this minimum threshold value and an average threshold value, the detergent used is a compacted powder, hereinafter referred to as DT2. This average threshold value is for example equal to 1.5.

Lorsque le ratio Y/Y' est compris entre la valeur de seuil moyenne et une valeur de seuil maximale, le détergent utilisé est une poudre dispersée, utilisée à une dose normale de l'ordre de 100 g, dénommé ci-après DT3. Cette valeur de seuil maximale est par exemple égale à 3,5.When the Y / Y 'ratio is between the average threshold value and a maximum threshold value, the detergent used is a dispersed powder, used at a normal dose of the order of 100 g, hereinafter referred to as DT3. This maximum threshold value is for example equal to 3.5.

Enfin, lorsque le ratio Y/Y' est supérieur à la valeur de seuil maximale, le détergent utilisé est une poudre dispersée surdosée, dans une quantité supérieure par exemple à 150 g, dénommé ci-après DT4.Finally, when the Y / Y 'ratio is greater than the maximum threshold value, the detergent used is an overdosed dispersed powder, in an amount greater than for example 150 g, hereinafter referred to as DT4.

Bien entendu, le procédé de détermination du type de détergent et de classification des détergents dans les différentes catégories DT1, DT2, DT3, DT4, est donné ici à titre d'exemple non limitatif. En particulier, le processus de détermination pourrait être affiné en prenant en compte d'autres mesures de conductivité du bain lessiviel à différents instants du processus de lavage, et par exemple en prenant en compte une mesure de conductivité réalisée à la fin de la deuxième phase, après brassage et avant la troisième phase de rappel d'eau, permettant ainsi de discriminer les poudres compactées des poudres dispersées en fonction de leur dissolution plus ou moins rapide dans l'eau.Of course, the method for determining the type of detergent and classification of detergents in the different categories DT1, DT2, DT3, DT4 is given here by way of non-limiting example. In particular, the determination process could be refined by taking into account other conductivity measurements of the detergent bath at different times of the washing process, and for example taking into account a conductivity measurement made at the end of the second phase. , after stirring and before the third water booster phase, thus making it possible to discriminate the compacted powders from the dispersed powders as a function of their more or less rapid dissolution in the water.

Dans son principe, le processus de détermination du type et de la quantité de détergent est fondé sur le fait que les détergents en poudre ont une composition plus riche et plus diversifiée que les détergents sous forme liquide. En outre, les détergents liquides se diluent régulièrement à chaque rajout d'eau contrairement aux détergents sous forme de poudre compactée qui se désagrégent avant de se dissoudre dans le bain.In principle, the process for determining the type and amount of detergent is based on the fact that powdered detergents have a richer and more diverse composition than detergents in liquid form. In addition, the liquid detergents are diluted regularly with each addition of water unlike detergents in the form of compacted powder which disintegrate before dissolving in the bath.

Ainsi, la classification réalisée des détergents DT1, DT2, DT3, DT4 permet en particulier de classer les détergents en fonction de leur rapidité de dissolution dans l'eau, de la plus rapide à la plus lente.Thus, the classification carried out detergents DT1, DT2, DT3, DT4 allows in particular to classify detergents according to their speed of dissolution in water, from the fastest to the slowest.

Grâce à cette reconnaissance du type et de la quantité de détergent utilisé, il est possible d'asservir des paramètres du processus de lavage. En pratique, on peut prendre en compte non seulement le type de lessive et son dosage, mais aussi la dureté de l'eau d'alimentation utilisée dans la machine, le type de textile (coton, synthétique, laine) et sa quantité qui peut être définie par famille de charge CV1, CV2, CV3, CV4, comme indiqué précédemment.With this recognition of the type and amount of detergent used, it is possible to enslave parameters of the washing process. In practice, we can take into account not only the type of laundry and its dosage, but also the hardness of the feed water used in the machine, the type of textile (cotton, synthetic, wool) and its quantity that can be defined by load family CV1, CV2, CV3, CV4, as indicated previously.

En particulier, un des paramètres qui peut être asservi en prenant en compte le type et/ou la quantité de détergent, est le nombre de phases de rinçage programmé dans un processus de lavage.In particular, one of the parameters that can be controlled by taking into account the type and / or the amount of detergent, is the number of rinsing phases programmed in a washing process.

En pratique, un processus de lavage théorique est programmé au niveau du microprocesseur, lorsque l'utilisateur choisi un programme prédéfini. Ce programme de lavage prédéfini prend en compte généralement le type de textile à laver, une température de lavage indiquée par l'utilisateur, ainsi qu'éventuellement d'autres paramètres.In practice, a theoretical washing process is programmed at the microprocessor level, when the user chooses a predefined program. This predefined wash program generally takes into account the type of fabric to be washed, a user-specified wash temperature, and possibly other parameters.

Grâce à la classification du détergent utilisé, le procédé d'asservissement peut être adapté à réduire ou à augmenter le nombre de phases de rinçage du processus de lavage théorique.By virtue of the classification of the detergent used, the control method can be adapted to reduce or increase the number of rinsing phases of the theoretical washing process.

En pratique, par exemple, lorsque le détergent est du type DT3 ou DT4, le nombre de phases de rinçage peut être augmenté, et par exemple au nombre de quatre, alors que, lorsque le détergent est du type DT1, le nombre de phases de rinçage peut être réduit, et par exemple égal à deux.In practice, for example, when the detergent is of the DT3 or DT4 type, the number of rinsing phases can be increased, for example by four, whereas, when the detergent is of the DT1 type, the number of phases of rinsing can be reduced, for example equal to two.

De même, la durée théorique programmée pour chaque phase de rinçage peut être augmentée ou diminuée à partir de la connaissance du type de détergent utilisé.Similarly, the theoretical duration programmed for each rinsing phase can be increased or decreased from the knowledge of the type of detergent used.

Le procédé d'asservissement permet de réguler des paramètres d'un essorage intermédiaire dans un processus de lavage de textile.The servo-control method makes it possible to regulate parameters of an intermediate spin in a textile washing process.

Comme illustré sur la figure 3, un essorage intermédiaire présente différents paliers de durée variable, correspondant à des vitesses différentes de rotation du tambour.As illustrated on the figure 3 , an intermediate spinning has different levels of variable duration, corresponding to different speeds of rotation of the drum.

Dans l'exemple de réalisation illustré sur la figure 3, l'essorage intermédiaire comporte une première phase de durée D1 pour une vitesse de rotation du tambour de l'ordre de 800 tours/minute, puis une seconde phase de durée D2 pour une vitesse maximale V de rotation du tambour, illustrée sur la figure 3 à 1050 tours/minute.In the exemplary embodiment illustrated on the figure 3 the intermediate spinning comprises a first phase of duration D1 for a rotational speed of the drum of the order of 800 revolutions / minute, then a second phase of duration D2 for a maximum speed V of rotation of the drum, illustrated in FIG. figure 3 at 1050 rpm.

Le procédé d'asservissement permet ainsi notamment de régler les valeurs des paramètres D1, D2 et V.The servo-control method thus makes it possible in particular to adjust the values of the parameters D1, D2 and V.

En particulier, le paramètre de durée D1 et/ou D2 d'essorage intermédiaire peut être réglé de la manière suivante.In particular, the parameter of duration D1 and / or D2 of intermediate spin can be set in the following manner.

La durée varie entre une valeur de seuil minimale pour un poids de textile à laver inférieur à 2 kilos (charge CV1) et un détergent à dissolution rapide (DT1) et une valeur de seuil maximale pour un poids de textile à laver supérieur à 4 kilos (CV4) et un détergent à dissolution lente (DT3).The duration varies between a minimum threshold value for a washing textile weight of less than 2 kilograms (CV1 load) and a fast dissolving detergent (DT1) and a maximum threshold value for a weight of washing textile greater than 4 kilograms (CV4) and slow dissolving detergent (DT3).

Ainsi, la durée D1 peut varier de 20 secondes pour une charge du type CV1 et un détergent du type DT1 à 120 secondes pour une charge du type CV4 et un détergent du type DT3.Thus, the duration D1 can vary from 20 seconds for a load of the type CV1 and a detergent of the type DT1 to 120 seconds for a load of the type CV4 and a detergent of the type DT3.

De même, le paramètre de durée D2 peut varier de 20 secondes pour une charge du type CV1 et un détergent du type DT1 à 200 secondes pour une charge du type CV4 et un détergent du type DT3.Similarly, the duration parameter D2 can vary from 20 seconds for a load type CV1 and a detergent type DT1 200 seconds for a CV4-type load and a detergent type DT3.

Le paramètre de vitesse maximale V de rotation du tambour de lavage peut également être régulé par le procédé d'asservissement.The maximum speed parameter V of rotation of the washing drum can also be regulated by the servo-control method.

Ce paramètre de rotation V peut varier entre une valeur de seuil minimale pour un poids de textile à laver inférieur à 2 kilos (charge de type CV1) et un détergent à dissolution rapide (DT1) et une valeur de seuil maximale pour un poids de textile à laver supérieur à 4 kilos (charge de type CV4) et un détergent à dissolution lente (DT3).This rotation parameter V can vary between a minimum threshold value for a weight of textile to be washed less than 2 kilos (type CV1 load) and a fast dissolving detergent (DT1) and a maximum threshold value for a textile weight washing greater than 4 kilograms (CV4 type charge) and slow dissolving detergent (DT3).

Ainsi, la vitesse V peut varier de 1050 tours/minute pour une charge de type CV3 et un détergent du type DT3 à 800 tours/minute pour une charge du type CV1 et un détergent du type DT1.Thus, the speed V can vary from 1050 revolutions / minute for a CV3-type load and a DT3-type detergent at 800 revolutions / minute for a load of the type CV1 and a detergent of the type DT1.

Enfin, dans le cas de la détermination d'un détergent surdosé DT4, la vitesse maximale peut être limitée à 800 tours/minute par exemple, afin d'éviter la création importante de mousse.Finally, in the case of the determination of an overdose DT4 detergent, the maximum speed can be limited to 800 revolutions / minute for example, to avoid the large creation of foam.

On a indiqué ci-dessus la variation de la durée et de la vitesse de rotation du tambour pendant une phase d'essorage intermédiaire dépendant du poids de textile à laver et du type et de la quantité de détergent utilisé.The variation of the drum rotation time and speed during an intermediate spin phase depending on the weight of the textile to be washed and the type and amount of detergent used has been indicated above.

Bien entendu, le type de textile à laver peut également être pris en compte pour modifier les valeurs des différents paramètres.Of course, the type of textile to be washed can also be taken into account to modify the values of the various parameters.

Par ailleurs, le procédé d'asservissement peut également prendre en compte différentes mesures périodiques de la conductivité d'un bain de rinçage à l'aide du capteur de conductivité 16 décrit précédemment.Moreover, the servo-control method can also take into account different periodic measurements of the conductivity of a rinsing bath using the conductivity sensor 16 described above.

Ainsi, le procédé d'asservissement à partir d'une mesure périodique de la conductivité d'un bain de rinçage pendant une phase de rinçage, met en oeuvre une étape de comparaison des valeurs de conductivité mesurées périodiquement et successivement, afin de déterminer la fin d'une phase de rinçage lorsqu'au moins deux mesures consécutives de conductivité sont sensiblement identiques.Thus, the method of servocontrol from a periodic measurement of the conductivity of a rinsing bath during a rinsing phase, implements a step of comparing the conductivity values measured periodically and successively, in order to determine the end a rinsing phase when at least two consecutive conductivity measurements are substantially identical.

En effet, au cours d'une phase de rinçage, le détergent piégé dans les fibres du textile est peu à peu extrait. Le temps de brassage idéal d'une phase de rinçage correspond au moment où il y a équilibre entre la concentration en détergent dans le bain de rinçage et celle contenue dans le linge, toute extraction complémentaire de détergent étant alors impossible.Indeed, during a rinsing phase, the detergent trapped in the textile fibers is gradually extracted. The ideal brewing time of a rinsing phase corresponds to the moment when there is a balance between the concentration of detergent in the rinsing bath and that contained in the laundry, any additional extraction of detergent being then impossible.

En pratique, cette phase d'équilibre se traduit par une valeur de conductivité du bain de rinçage qui n'évolue plus. Aussi, en calculant la différence entre deux valeurs successives de mesure de conductivité, avec une périodicité prédéterminée de l'ordre de 1 minute par exemple, il est possible de déterminer une fin de phase de rinçage lorsque cette différence est inférieure à une valeur de seuil préfixée.In practice, this equilibrium phase results in a conductivity value of the rinsing bath which no longer evolves. Also, by calculating the difference between two successive values of conductivity measurement, with a predetermined periodicity of the order of 1 minute for example, it is possible to determine a rinse phase end when this difference is less than a threshold value. prefixed.

Ce procédé d'asservissement permet ainsi de diminuer la durée théorique, ou prédéterminée en début d'un processus de lavage comme indiqué ci-dessus, pour tenir compte de l'évolution réelle de la phase de rinçage.This servo-control method thus makes it possible to reduce the theoretical or predetermined duration at the beginning of a washing process as indicated above, to take account of the actual evolution of the rinsing phase.

Il permet d'écourter les phases de rinçage lorsque celles-ci ne sont plus efficaces et ainsi de diminuer la durée totale du processus de lavage et la consommation en eau, sans pour autant nuire à la qualité du rinçage.It makes it possible to shorten the rinsing phases when they are no longer effective and thus to reduce the total duration of the washing process and the water consumption, without affecting the quality of the rinsing.

De même, le procédé d'asservissement est adapté, à partir de la mesure de la conductivité d'un bain de rinçage pendant une phase de rinçage, à comparer la valeur de la conductivité mesurée avec la valeur prédéterminée Y de la conductivité associée à l'eau d'alimentation, pour identifier l'avant dernier rinçage nécessaire.Similarly, the control method is adapted, from the measurement of the conductivity of a rinsing bath during a rinsing phase, to compare the value of the measured conductivity with the predetermined value Y of the conductivity associated with the rinsing phase. feed water, to identify the penultimate rinse required.

Ce test est fondé sur le principe que plus la valeur de la conductivité mesurée dans le bain de rinçage est proche de la valeur de la conductivité Y de l'eau d'alimentation, moins de détergent est extrait du linge. En comparant la conductivité de l'eau d'un bain de rinçage à la fin de chaque phase de rinçage, il est possible de déterminer si le rinçage suivant peut être le dernier rinçage.This test is based on the principle that the higher the conductivity value measured in the rinse bath is close to the Y conductivity value of the feed water, the less detergent is removed from the laundry. By comparing the conductivity of the water in a rinse bath at the end of each rinse phase, it is possible to determine whether the next rinse can be the last rinse.

Ainsi, lorsque la valeur de la conductivité mesurée est sensiblement égale à la valeur prédéterminée Y de la conductivité de l'eau d'alimentation, on met en oeuvre une dernière phase de rinçage, au cours de laquelle éventuellement un assouplissant peut être introduit.Thus, when the value of the measured conductivity is substantially equal to the predetermined value Y of the conductivity of the feedwater, a last rinsing phase is used, during which a softener may optionally be introduced.

Ce procédé d'asservissement permet également d'asservir le nombre de phases de rinçage théorique, ou prédéterminé au début du procédé de lavage comme indiqué précédemment.This servo-control method also serves to control the number of theoretical or predetermined rinse phases at the beginning of the washing process as indicated above.

On peut ainsi limiter le nombre de phases de rinçage, et diminuer la durée du processus de lavage et la quantité d'eau consommée, sans nuire pour autant à la qualité du rinçage.It is thus possible to limit the number of rinsing phases, and to reduce the duration of the washing process and the quantity of water consumed, without impairing the quality of the rinsing.

La présente invention permet ainsi, en mesurant la conductivité des bains de rinçage et de lavage tout au long d'un processus de lavage, d'asservir différents paramètres de ce processus de lavage afin notamment de limiter les contraintes mécaniques sur le linge et limiter les nuisances acoustiques.The present invention thus makes it possible, by measuring the conductivity of the rinsing and washing baths throughout a washing process, to control various parameters of this washing process in order, in particular, to limit the mechanical stresses on the laundry and to limit the acoustic nuisance.

Bien entendu, de nombreuses modifications peuvent être apportées à l'exemple de réalisation décrit précédemment sans sortir du cadre de l'invention.Of course, many modifications can be made to the embodiment described above without departing from the scope of the invention.

En particulier, l'invention a été décrite pour une machine à laver le linge. Elle peut également s'appliquer à un lave-vaisselle, le procédé d'asservissement étant adapté à régler par exemple le durée de la phase de lavage ou le nombre et la durée des phases de rinçage en fonction du type et/ou de la quantité de détergent utilisé.In particular, the invention has been described for a washing machine. It can also be applied to a dishwasher, the servo process being adapted to adjust for example the duration of the washing phase or the number and duration of the rinsing phases depending on the type and / or quantity of detergent used.

Claims (13)

  1. Control method for one or more parameters of a fabric washing process, according to a function depending at least on the type and/or quantity of detergent used in said washing process, said washing process comprising a washing cycle, in which a detergent is introduced into a washing bath, followed by several rinsing cycles separated by intermediate spinning, characterised in that said parameters comprise a duration (D1, D2) of intermediate spinning in said fabric washing process and/or a maximum rotation speed (V) of a washing drum during said intermediate spinning.
  2. Control method according to claim 1, characterised in that it comprises a step of determining the type and/or quantity of detergent used in said washing process, said determination step comprising a step of measuring the conductivity of a washing bath.
  3. Control method according to claim 2, characterised in that said step of determining the type and/or quantity of detergent used furthermore comprises a step of calculating a ratio of a predetermined value (Y) of the conductivity associated with the supply water and the measured value (Y') of said conductivity of a washing bath, and a step of comparing said ratio with one or more predetermined threshold values.
  4. Control method according to one of claims 2 to 3, characterised in that said step of measuring the conductivity of a washing bath is implemented after stirring said washing bath.
  5. Control method according to one of claims 1 to 4, characterised in that the value of the parameter(s) of a fabric washing process is fixed according to a function furthermore depending at least on the fabric type and the weight of fabric to wash.
  6. Control method according to one of claims 1 to 5, characterised in that said duration varies between a minimum threshold value for a weight of fabric to wash of less than 2kg and a fast-dissolving detergent and a maximum threshold value for a weight of fabric to wash of more than 4kg and a slow-dissolving detergent.
  7. Control method according to one of claims 1 to 6, characterised in that the maximum rotation speed (V) of the drum (12) varies between a minimum threshold value for a weight of fabric to wash of less than 2kg and a fast-dissolving detergent and a maximum threshold value for a weight of fabric to wash of more than 4kg and a slow-dissolving detergent.
  8. Control method according to one of claims 1 to 7, characterised in that said parameters furthermore comprise the number of rinsing cycles of a washing process and the respective duration of said rinsing cycles.
  9. Control method according to one of claims 1 to 8, characterised in that it furthermore comprises the following steps:
    - periodic measurement of the conductivity of a rinsing bath during a rinsing cycle;
    - comparing said conductivity values (Y') measured periodically; and
    - determining the end of said rinsing cycle when at least two consecutive conductivity measurements are roughly the same.
  10. Control method according to one of claims 1 to 9, characterised in that it comprises the following steps:
    - measuring the conductivity of the rinsing bath during a rinsing cycle;
    - comparing said measured conductivity value (Y') with a predetermined conductivity value (Y) associated with the supply water; and
    - implementing a last rinsing cycle when said measured conductivity value (Y') is roughly the same as the predetermined value (Y) of the conductivity of the supply water.
  11. Washing machine, characterised in that it comprises means for determining the type and/or quantity of detergent and a microprocessor which is adapted to carry out the control method according to one of claims 1 to 10.
  12. Washing machine according to claim 11, characterised in that it furthermore comprises means for determining the weight of the fabric to wash and means to determine the fabric type.
  13. Washing machine according to one of claims 11 or 12, characterised in that said means for determining the type of detergent are suitable for selecting said detergent from a group of detergents comprising at least detergents in liquid or compacted or dispersed powder form.
EP06290510.4A 2005-04-01 2006-03-31 Method for controlling one or several parameters of a wash process and machine for such a method Active EP1707663B1 (en)

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FR0503232A FR2883890B1 (en) 2005-04-01 2005-04-01 METHOD FOR SERVICING ONE OR MORE PARAMETERS OF A WASHING PROCESS AND MACHINE USING SUCH A METHOD OF SERVICING

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FR2883890A1 (en) 2006-10-06
EP1707663A1 (en) 2006-10-04
ES2615506T3 (en) 2017-06-07

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