EP3268531B1 - Procédé de détermination du degré d'hygiène d'un lave-linge comprenant un capteur d'impédance, ainsi que lave-linge pour la mise en oeuvre de ce procédé - Google Patents

Procédé de détermination du degré d'hygiène d'un lave-linge comprenant un capteur d'impédance, ainsi que lave-linge pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP3268531B1
EP3268531B1 EP16709448.1A EP16709448A EP3268531B1 EP 3268531 B1 EP3268531 B1 EP 3268531B1 EP 16709448 A EP16709448 A EP 16709448A EP 3268531 B1 EP3268531 B1 EP 3268531B1
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EP
European Patent Office
Prior art keywords
washing machine
impedance
hygiene
level
cleaning
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EP16709448.1A
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German (de)
English (en)
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EP3268531A1 (fr
Inventor
Dirk Aurich
Andreas Bischof
Michael Munick
Hartmut Schaub
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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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
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/008—Methods for washing, rinsing or spin-drying for disinfecting the tub or 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
    • 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

Definitions

  • the invention relates to a method for determining the degree of hygiene of a washing machine with an impedance sensor (also referred to as an electrochemical impedance sensor) and a washing machine suitable for this purpose.
  • the invention relates in particular to a method for determining a degree of hygiene H of a washing machine with a tub, a drum for holding laundry items, a drive motor for the drum, and a control device, and a washing machine suitable for carrying out this method.
  • laundry In a washing machine, laundry is generally treated in a washing phase for cleaning with a detergent solution containing detergent.
  • Detergents contain, in particular, surfactants as surface-active substances to form a wash liquor for cleaning laundry items. Residues from water, treated laundry items or detergents can accumulate in a washing machine even when used correctly. From these residues, a biofilm can form in the household appliance, which may be very difficult to remove. The user of the washing machine usually only notices anything of this if the biofilm secretes off unpleasant smelling substances. At this point, a clear biofilm has mostly formed. The smell can also be very unpleasant.
  • Biofilms contain immobilized bacterial cells that are embedded in a polymer matrix of microbial origin and, in addition to microorganism cells, can contain abiotic or inorganic constituents in larger quantities, all of which are held together by mucus formed by bacteria.
  • a special hygiene program is sometimes activated, in which, for example, steam and / or liquids or gases provided with bioactive additives are used to clean the relevant parts of the washing machine.
  • the hygiene programs are not optimal for the hygienic needs of the Washing machines matched because the time, duration and intensity of the measures carried out in a hygiene program are not matched to the actual hygiene status in the washing machine. It would therefore be desirable to obtain qualitative and in particular also quantitative information about the degree of hygiene of the washing machine and to restore a desired degree of hygiene of the washing machine.
  • the EP 2 465 993 A1 and EP 2 465 993 A1 describe a laundry treatment device with a cycle for the treatment of biofilms and corresponding methods. For example, if foaming is detected using a sensor for a refractive index, turbidity, surface tension or capacitance in an area of the device that is not easily accessible, possible consequences such as the formation of a biofilm by carrying out a cycle for treating biofilms are addressed. For this purpose, the relevant part of the device is heated, for example, directly or by means of hot air. The use of biocidal compounds is also discussed.
  • the DE 100 42 846 A1 describes a method for the qualitative and / or quantitative characterization of polar constituents in liquids by impedance measurement as well as the application of the method and possibly an electrode arrangement for controlling the supply of surfactants based on the characterization of the surfactant content in the washing and / or rinsing water of washing machines.
  • the EP 2 533 035 A1 describes a device for recording material properties of a medium, with a measuring device including a sensor device that is connected to the medium, and a control device for controlling the sensor device with signals of a predetermined frequency range, and a control device for controlling the operation of the measuring device and specifying the predetermined frequency range, the control device being provided for determining the course of the impedance Z of the medium corresponding to the predetermined frequency range as a function of the frequency, and for outputting a detection signal, and the control device being provided for evaluating the detection signal of the control device, determining a plurality of characteristic ones Points (P1 to P4) of the course of the impedance Z and generation of a result signal relating to the properties of the medium. It should be possible, for example, to determine whether a wash liquor needs additional detergent addition.
  • the DE 43 11 064 A1 describes a method for measuring the contamination of a washing liquor, whereby measured values (M R , M I ) are determined separately from the real part and imaginary part from the electrical impedance of an AC capacitor, between the plates of which the washing liquor is located, and the measured values are compared with predetermined limit values become.
  • the EP 1 441 056 A1 discloses a washing machine comprising a tank for loading a washing liquid and things to be washed and control means adapted to carry out a predetermined washing program.
  • the washing machine comprises at least a first electrode which is electrically insulated from the washing liquid and sensor means which are to be connected to the control means and the first electrode and are to be adapted to a value of a sensor which passes through the first electrode and through the washing liquid second electrode is formed to determine.
  • the value should be fed to the control means in order to regulate and / or adapt a washing program.
  • the value determined by the sensor should indicate a capacitance and / or a complex impedance of the two electrodes.
  • the EP 2 711 697 A2 discloses a method for recording properties of fluid media within a predetermined process using impedance spectroscopy, wherein various steps for recording and evaluating impedance characteristics and certain characteristic points are described in detail. Differences between the respective characteristic points of the current acquisitions of the impedance characteristics are determined and evaluated.
  • the JP 2010-213889 A discloses a sensor for a cleaning liquid according to the summary. This is intended to solve the problem of providing a sensor which can precisely determine a resistance value of a cleaning liquid. For this purpose, a change in a parallel resonance impedance is detected and evaluated with regard to the resistance value of the cleaning liquid.
  • the object of the invention was to provide an improved method for determining a degree of hygiene in a washing machine.
  • This degree of hygiene should preferably be able to be determined and displayed in a manner which is advantageous for a user, wherein the user should preferably also be given an opportunity for suitable remedial measures.
  • the object of the invention was also to provide a washing machine suitable for carrying out this method.
  • the invention thus relates to a method for determining a degree of hygiene H of a washing machine with a tub, a drum for holding items of laundry, a drive motor for the drum, and a control device for controlling at least one washing program, with an impedance sensor arranged in the washing machine, which in the Course of a washing program comes into contact with an aqueous liquid, an impedance signal is measured and the impedance signal is evaluated with regard to deposits on the impedance sensor as a measure of the hygiene level H of the washing machine.
  • an "aqueous liquid” can mean water, a wash liquor or a rinsing liquid. Furthermore, the “aqueous liquid” can also be embedded in a biofilm adhering to the impedance sensor.
  • a relationship between the impedance signal and the type and / or amount of deposits on the impedance sensor stored in the control device is used for evaluating the impedance signal with regard to deposits on the impedance sensor as a measure of the hygiene level H of the washing machine.
  • the impedance sensor is preferably arranged in a induction bowl, the tub and / or on the drum. At least one impedance sensor is particularly preferably arranged in the rear region of the tub and / or the drum. In this way, the degree of hygiene is determined, in particular, at the point (s) at which a biofilm can form particularly easily and which are sometimes relatively difficult to access.
  • the deposition on the impedance sensor can consist of various components such as dirt and detergent residues as well as the components of an emerging or existing biofilm. It is particularly preferred for the present invention that the deposition on the impedance sensor is a biofilm.
  • the impedance sensor in the washing machine can come into contact with air and water with salts (chlorides, hardening agents).
  • deposits may be present on the impedance sensor, which may be in the form of biofilm (again consisting of 85-90% water with salts) and / or particles (deposits of water hardness, zeolites, dirt residues, etc.).
  • biofilm again consisting of 85-90% water with salts
  • particles deposits of water hardness, zeolites, dirt residues, etc.
  • the impedance sensor If the impedance sensor is not wetted and without deposits in air, then the highest possible electrical resistance is present, since air represents an insulator in this connection and therefore a high impedance. This condition exists as long as the impedance sensor is being measured in a new or a little used or carefully cleaned machine without water.
  • the impedance sensor comes into contact with water, the electrical resistance or impedance drops immediately (the gradient of the drop is large).
  • the impedance sensor If there are dry deposits (particles) on the impedance sensor, an impedance signal similar to that in air is produced. If these coverings become damp or if a biofilm is present, the measured impedance is lower than that of an airborne one Impedance sensor (when the pads connect the electrodes of the sensor), but higher than with a clean sensor wetted with water. If a biofilm has formed on the sensor in particular, the impedance lies between that of water and solid deposits.
  • the temporal gradient of the impedance depends on the type of covering.
  • the type of deposition can thus be deduced from the time course of the impedance signal. In particular, whether it is a particle deposit or a biofilm.
  • the course of time can be evaluated both in the short term, i.e. when changing from the dry state to the wetted state when carrying out a washing process, and also in the long term, i.e. in the same wetting state over several washing processes, in order to gain knowledge about the type of covering reach.
  • the change in the gradient over time over the service life of the washing device is also different when building up a particle deposit than when building up a biofilm and can therefore provide knowledge about the type of deposit and the condition of the washing machine.
  • a method in which an impedance signal from the impedance sensor is measured in the washing machine in the presence of water before carrying out a first laundry treatment, in particular washing items of laundry, and in the control device as a reference measurement which ensures a maximum Corresponds to the hygiene level H max .
  • the water used for washing programs can be used for the measurement.
  • standard solutions with different specified conductivity values can also be used, so that the conductivity value of an aqueous liquid used can also be taken into account in the later measurements as a measure of the water hardness.
  • reference measurements for different temperatures can be carried out and stored in the control device.
  • the implementation of the method according to the invention should as far as possible not be disturbed by the presence of detergent or dirt.
  • the impedance signal is therefore preferably measured and evaluated with regard to deposits on the impedance sensor as a measure of a hygiene condition H of the washing machine by using a washing liquid from the last washing step of a washing phase or water as the aqueous liquid.
  • the impedance signal is evaluated with regard to the hygiene level H of the washing machine, and remedial measures are taken when a minimum hygiene level H min is reached or undershot.
  • a preferred remedial measure consists in that when a minimum hygiene level H min is reached or undershot, a cleaning program is automatically carried out with a cleaning liquid which has a predetermined high minimum temperature T min1 and / or contains cleaning additives with a cleaning power F 1 .
  • the high minimum temperature T min1 can be 50 ° C or more, for example.
  • cleaning power means, for example, a concentration or an oxidizing ability of a cleaning additive and therefore generally also stands for a biocidal effect of a cleaning additive. If the cleaning additive is the same in two cleaning liquids, different cleaning staff therefore stand for different concentrations of the cleaning additive.
  • a storage container for such a cleaning liquid or for the cleaning additives can preferably be present in a washing machine used to carry out the method.
  • Suitable additives can e.g. detergents, oxidizing agents, acids and alkalis containing surfactants.
  • Biocidal substances are preferably used as additives, i.e. Biocides.
  • the biocide is not restricted as long as it can be used in the washing machine.
  • it can be hypochlorite, which is generated by electrolysis of a saline solution, which can be present in a suitable storage container of the washing machine in embodiments of the washing machine, or an oxidizing gas.
  • the oxidizing gas can be generated, for example, in a plasma generator.
  • ozone can be used as a biocidal agent.
  • the heating for the washing liquor which is generally present anyway in a washing machine is preferably used.
  • an impedance signal is again recorded on the impedance sensor, preferably in the presence of water with regard to remaining deposition residues, and evaluated to determine whether the hygienic state is above H min . If this is not the case, a cleaning program is preferably carried out automatically again.
  • a cleaning program is preferably only carried out if there are no items of laundry in the drum.
  • a cleaning program is carried out with a cleaning liquid that has a predetermined high minimum temperature T min2 T T min1 and / or cleaning additives with a cleaning power F 2.
  • F 1 contains. Then T min2 > T min1 and / or F 2 > F 1 is very particularly preferred.
  • the washing machine used in the method according to the invention has an acoustic and / or optical display device, preferably the reaching or falling below the minimum hygiene level H min is displayed on the display device.
  • the cleaning program is carried out while a movement program of the drum stored in the control device is being carried out.
  • the execution of a cleaning program is preferably displayed on a display device, if present.
  • “Drum movement program” generally means a succession of rotation and standstill phases of the drum.
  • the rotational speed of the drum can be different in the rotational phases of the drum.
  • the direction of rotation of the drum can also be changed.
  • reversing phases are possible in which the drum is first rotated in one direction and then, possibly after a short pause, rotated again in the other direction, this process being able to be repeated several times.
  • the desired minimum level of hygiene H min can differ depending on the composition of the members of a household, since these may have different requirements or requirements with regard to the level of hygiene.
  • the minimum level of hygiene H min of a washing machine and thus also the hygiene status of items of laundry washed therein can differ, depending on whether the items to be treated are intended for allergy sufferers, the sick, the elderly or babies, for example. Accordingly, the washing machine is set up in such a way that a user can specify the washing machine H min and thus enter it via an operating device.
  • the method according to the invention can be carried out at different times in a washing program, but preferably before carrying out a washing phase and after a first rinsing step of a rinsing phase.
  • the method according to the invention does not always have to be carried out in connection with a specific washing program. Rather, it can advantageously be provided that the method is only carried out after a certain period of use of the washing machine.
  • the method according to the invention can be carried out independently of a washing program. If the method according to the invention is only to be carried out after a certain period of use of the washing machine, a suitable measure is preferably used for the period of use. For example, there may be a counter which counts the number n of washing programs carried out in the washing machine since a last measurement or after a last cleaning program. When a predetermined maximum number n max is reached , the method according to the invention can then be carried out. A further measure can be the weight M of the laundry items washed to date, which is obtained by adding up the individual load quantities during the period of use. When a predetermined maximum weight M max is reached , the method according to the invention can then be carried out. Finally, the time period actually past since a last measurement or after a last cleaning program can also be used as a measure.
  • the impedance signal is therefore measured and evaluated with regard to deposits on the impedance sensor as a measure of the degree of hygiene H of the washing machine if a predetermined period of use, i.e. a predetermined service life, the washing machine has passed.
  • a cleaning program can also be initiated if the deposits on the impedance sensor itself are not yet sufficient for an assessment that H min is below, but it is determined by the impedance sensor or another sensor that residual detergent or ( microbial) has partially loosened dirt due to the water introduced.
  • the impedance sensor when measuring the impedance in a rinsing phase, preferably in one of the last or in the last rinsing step, a possible influence of detergent or dirt still present in the rinsing liquid is taken into account, with a connection between the impedance signal and Detergent concentration and dirt as well as different amounts of deposits are deposited on the impedance sensor.
  • impedance signals are generally recorded and evaluated by the impedance sensor, by applying electrical alternating voltage to the impedance sensor at varying frequencies and evaluating the impedance signals with regard to the phase angle ⁇ and the magnitude of the impedance, in order to determine the assignment of the impedance sensor with deposits and in particular to determine the presence of a biofilm or of components thereof.
  • phase angle ⁇ and amount of impedance can be evaluated with regard to the type, amount and concentration of deposits, for example components of a biofilm, or of particle deposits, such as lime, detergent residues, zeolites, dirt residues, etc.
  • an impedance spectrum is generally recorded using a suitable electrode system as an impedance sensor.
  • the impedance of an electrochemical system is examined as a function of the frequency of an AC voltage.
  • Various representations are known to the person skilled in the art, for example the Nyquist representation, in which the real part or the imaginary part of the impedance are represented as a function of the AC voltage frequency used.
  • a few characteristic points are generally suitable for characterizing the impedance spectrum (cf. EP 2 767 825 A1 ), for example at the maximum of the imaginary part in a lower frequency range or at the minimum of the imaginary part in an upper frequency range.
  • Important information for the assignment of the impedance sensor to deposits can generally be derived from the impedance and frequency values at the characteristic points.
  • the conductivity of the aqueous liquid can be determined, for example, from the real part of a point.
  • the capacitance of the so-called conductivity measuring cell formed by the impedance sensor and the aqueous liquid can generally be determined.
  • Another measure that depends on the properties of the coating and the aqueous liquid surrounding it is the flattening of a semicircle in the Nyquist representation, which can be determined by the ratio of height to width of the semicircle. The evaluation is carried out using formulas known to the person skilled in the art.
  • a degree of hygiene can be determined by using an impedance sensor, which can preferably specifically indicate the presence of deposits in the washing machine, in particular of biofilms.
  • the method according to the invention can also be combined with another method for determining the degree of hygiene H, for example by using a predetermined amount of a biocide such as ozone and evaluating the consumption of the biocide.
  • a biocide such as ozone
  • an impedance sensor for example by changing a concentration or amount of a disinfectant such as e.g. Ozone the degree of hygiene can be determined.
  • a concentration or amount of a disinfectant such as e.g. Ozone
  • the degree of hygiene can be determined.
  • an impedance sensor for example by changing a concentration or amount of a disinfectant such as e.g. Ozone the degree of hygiene can be determined.
  • such an measurement can also be used to calibrate an impedance sensor. It makes sense to exclude or minimize the possible influence of inorganic or organic non-living contaminants. This could happen, for example, in that a degree of contamination with such inorganic or organic impurities that can already be determined optically by a user can be set by a user or
  • the impedance signals are evaluated with regard to electrical conductivity as a measure of water hardness, in particular when a reference signal is recorded. This makes it possible to estimate the formation of deposits from detergent constituents and ions containing water.
  • the useful life of the washing machine which is preferably a requirement for carrying out the method, can be adapted. For example, this time is relatively short in the event of a large tendency to form such deposits.
  • the invention also relates to a washing machine with a tub, a drum for holding items of laundry, a drive motor for the drum, a control device for controlling at least one washing process, and with an impedance sensor arranged in the washing machine which comes into contact with a during the washing process aqueous liquid comes, the
  • the control device is set up to carry out a method in which an impedance signal is measured and evaluated with regard to deposits on the impedance sensor as a measure of the degree of hygiene H of the washing machine, the control device also being set up to carry out a first laundry treatment in the washing machine in In the presence of water, an impedance signal from the impedance sensor is measured and stored in the control device as a reference measurement, which corresponds to a maximum degree of hygiene H max , the control device storing a relationship between the impedance signal and the type and / or amount of deposits on the impedance sensor.
  • the impedance sensor is arranged in the tub, the induction bowl and / or on the drum.
  • the impedance sensor is very particularly preferably arranged in a rear half of the tub, a lower half of a heating pocket arranged in the tub and / or on the rear of the drum.
  • a temperature sensor is arranged in the tub and in the control device a relationship between impedance signals and the type and amount of deposits is stored on the impedance sensor for various temperature values measured with the temperature sensor.
  • Additional sensors for monitoring and controlling the operation can also be used in the washing machine, for example a turbidity sensor.
  • a washing machine used herein generally also has a heater and a drain system with a drain pump arranged on the bottom of a tub.
  • a washing machine used herein generally also has laundry carriers and / or scoops.
  • the washing machine according to the invention can be a washing machine as such or a washer dryer, that is to say a device which has the functions of a dryer and a washing machine.
  • the washing machine according to the invention preferably has an acoustic and / or visual display means for displaying one or more operating states.
  • the display device can consist, for example, of one or more LEDs, which can indicate a degree of hygiene H of the washing machine by lighting or not lighting or by displaying different colors.
  • a liquid crystal display can also be present, for example.
  • a measuring device for determining the amount of water filled in the washing machine for example a time measuring device for determining the opening period of an inlet valve for the water or a liquid amount measuring device for measuring the amount of water filled.
  • the control device is in particular also designed to carry out a number of selectable laundry treatment programs.
  • the cleaning program can be carried out in different ways, wherein a washing machine according to the invention can contain different further components depending on a cleaning program to be carried out.
  • a storage container for a cleaning liquid or cleaning, in particular biocidal, additives can be present.
  • the washing machine can contain, for example, a device for providing ozone, in particular an ozone generator or else an opening or an intermediate store for an ozone-containing liquid.
  • the control device of the washing machine is then generally set up to control the generation and / or supply of ozone or an ozone-containing liquid.
  • An ozone removal device and / or various controllable closure devices are then usually also present.
  • the invention has numerous advantages. In this way, contamination and deposits, in particular the formation of a biofilm, can be recognized at an early stage. This enables them to be removed early and therefore comparatively easily before a user of the washing machine perceives the negative effects, such as a bad smell, for example. It can be ensured that a washing machine always meets the hygienic requirements.
  • the invention also enables particularly suitable cleaning programs as remedial measures in embodiments.
  • the washing machine is not only not damaged by a cleaning program, it can also extend the life of the washing machine. Because although the invention allows the use of aggressive cleaning liquids, these can be dispensed with. The invention thus enables an early cleaning program in which, for example, the use of hot water, possibly with less aggressive biocidal additives, is sufficient.
  • the invention has the advantage that it is possible to determine and display the degree of hygiene of laundry treatment devices in a simple and efficient manner.
  • the method according to the invention makes it possible to provide improved laundry treatment programs and hygiene programs, in particular to improve the degree of hygiene. This leads to a general improvement in the hygiene of the laundry, which is also suitable for special user groups such as Allergy sufferers can be specifically improved. As a result, carefree washing is possible, and excessive temperatures can also be avoided. This helps protect the laundry and reduces energy consumption.
  • the invention is illustrated below on the basis of a non-restrictive first embodiment for a washing machine according to the invention shown in the single figure, in which a method according to the invention can be carried out.
  • a schematic representation of the parts of the washing machine relevant to the invention is shown.
  • the washing machine 1 of the figure has a tub 2 in which a drum 3 is rotatably mounted and can be driven by the drive motor 5.
  • the axis of rotation 19 of the drum 3 is directed upwards from the horizontal by a small angle (for example 13 °), so that the user of the washing machine 1 has easier access and insight into the interior of the drum 3.
  • this arrangement also intensifies the flooding of the laundry items 4 with washing liquor 7.
  • an impedance sensor 10 Arranged in the induction bowl 12 is an impedance sensor 10, which is generally an electrode system comprising a plurality of electrodes, for example two capacitor plates. With the help of impedance sensor 10, existing deposits as well as any existing biofilm can be determined and analyzed in the induction bowl 12, so that a cleaning program can be carried out early and in an optimized manner.
  • the washing machine 1 also has an alkali inlet system, which comprises a water connection fitting for the domestic water network 20, an electrically controllable valve 21 and a feed line 13 to the suds container 2, which can optionally also be routed via the detergent dispenser tray 12, from which the incoming water detergent portions into the Tub 2 can transport.
  • an alkali inlet system which comprises a water connection fitting for the domestic water network 20, an electrically controllable valve 21 and a feed line 13 to the suds container 2, which can optionally also be routed via the detergent dispenser tray 12, from which the incoming water detergent portions into the Tub 2 can transport.
  • a heating device 16 for heating water or washing liquor 7.
  • the valve 21 as well as the heating device 16 can be controlled by a control device 8 as a function of a program flow chart which is based on a time program and / or on the achievement of certain Measured values of parameters such as alkali level, alkali temperature, drum speed etc. can be bound within the washing machine 1.
  • the washing machine 1 means a pressure sensor, i.e. a sensor for measuring the hydrostatic pressure in the tub 2.
  • the hydrostatic pressure p results from the level of the free liquor 7 which forms in the tub 2, i.e. of the aqueous liquid 7 which is not bound in the laundry items 4.
  • the washing machine 1 comprises a measuring device 15 for determining the amount of water filled.
  • it can be designed as a water flow meter or as a flow meter.
  • the amount of water that has flowed in is calculated in conjunction with a recorded filling time.
  • the flow can also be determined by measuring the time until a predetermined level is reached, which corresponds to a certain fixed amount of water.
  • 18 means a drain pump for pumping out the wash liquor 7.
  • 9 denotes an impedance sensor in the tub 2, the construction of which from electrodes is not shown here.
  • the impedance sensor 9 is arranged in a rear half of the tub 2.
  • a display device with which a determined degree of hygiene of the washing machine can be displayed.
  • the determination of an insufficient level of hygiene that is, if the level of hygiene is less than a prescribed minimum value H min , can be displayed, for example when the hygiene status is shown by a red diode lighting up. If, on the other hand, the level of hygiene is sufficient, this fact can be indicated by the lighting up of a corresponding green LED.
  • cleaning parameters such as e.g. the temperature of an aqueous liquid used and any additives can be displayed.
  • a temperature sensor 22 is provided in the tub for measuring the temperature of the aqueous liquid.
  • 23 means a storage container for a cleaning liquid in which there are preferably cleaning, in particular biocidal, additives.
  • the display device 11 can also be used to display process parameters of a washing program carried out in the washing machine 1, such as, for example, a temperature of the washing liquor, a remaining duration of the program, and a load quantity.

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

Claims (14)

  1. Procédé pour la détermination d'un degré d'hygiène H d'un lave-linge (1) avec une cuve de lavage (2), un tambour (3) pour l'accueil du linge (4), un moteur d'entraînement (5) pour le tambour (3), et un dispositif de commande (8) pour la commande d'au moins un programme de lavage, dans lequel un signal d'impédance est mesuré au moyen d'un capteur d'impédance (9, 10) disposé dans le lave-linge (1), lequel capteur entre en contact avec un fluide aqueux (7) au cours d'un programme de lavage, caractérisé en ce que le signal d'impédance est évalué quant à des dépôts sur le capteur d'impédance (9, 10) comme mesure du degré d'hygiène H du lave-linge (1), et en ce qu'avant l'exécution d'un premier traitement du linge dans le lave-linge (1) en présence d'eau (7) un signal d'impédance du capteur d'impédance (9, 10) est mesuré et enregistré dans le dispositif de commande (8) comme mesure de référence correspondant à un degré d'hygiène maximal Hmax, dans lequel un lien enregistré dans le dispositif de commande (8) entre le signal d'impédance et le type et/ou la quantité de dépôts sur le capteur d'impédance (9, 10) est mis à contribution.
  2. Procédé selon la revendication 1, caractérisé en ce que le capteur d'impédance (9, 10) est disposé dans un bac à lessive (12), dans la cuve de lavage (2) et/ou sur le tambour (3).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le dépôt sur le capteur d'impédance (9, 10) est un biofilm.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le signal d'impédance est mesuré et évalué quant aux dépôts sur le capteur d'impédance (9, 10) comme mesure pour un état d'hygiène H du lave-linge (1), en utilisant comme fluide aqueux (7) un liquide de lavage issu de la dernière étape de rinçage d'une phase de lavage ou de l'eau.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le signal d'impédance est évalué quant à un degré d'hygiène H du lave-linge (1) et des mesures correctives sont adoptées lorsqu'undegré d'hygiène minimal Hmin est atteint ou lorsqe le degré d'hygiène H est inférieur à un degré d'hygiène minimal Hmin.
  6. Procédé selon la revendication 5, caractérisé en ce que la mesure corrective consiste en l'exécution automatique d'un programme de lavage avec un liquide de nettoyage présentant une température minimale prescrite élevée Tmin1 et/ou contenant des additifs de nettoyage avec une force de nettoyage F1, dans lequel le liquide de nettoyage est de préférence stocké dans un réservoir (23) disposé dans le lave-linge (1).
  7. Procédé selon la revendication 6, caractérisé en ce qu'après l'exécution du programme de lavage en présence d'eau un nouveau signal d'impédance est enregistré quant à des résidus de dépôt demeurant sur le capteur d'impédance (9, 10) et évalué afin de déterminer si l'état d'hygiène est supérieur à Hmin.
  8. Procédé selon la revendication 7, caractérisé en ce que lors de l'établissement d'un état d'hygiène H ≤ Hmin un programme de lavage est exécuté avec un liquide de nettoyage présentant une température minimale élevée prescrite Tmin2 ≥ Tmin1 et/ou contenant des additifs de lavage avec une force de lavage F2 ≥ F1.
  9. Procédé selon l'une des revendications 5 à 8, caractérisé en ce que l'atteinte ou le fait de demeurer en-deçà du degré d'hygiène minimal Hmin s'affiche sur un dispositif d'affichage (11).
  10. Procédé selon l'une des revendications 5 à 9, caractérisé en ce que le programme de lavage est exécuté pendant l'exécution d'un programme de déplacement du tambour (3) enregistré dans le dispositif de commande (8).
  11. Procédé selon l'une des revendications 5 à 10, caractérisé en ce que l'exécution d'un programme de lavage s'affiche sur un dispositif d'affichage (11).
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que le signal d'impédance est mesuré et évalué quant aux dépôts sur le capteur d'impédance (9, 10) comme mesure pour le degré d'hygiène H du lave-linge (1), lorsqu'une durée d'utilisation prescrite du lave-linge s'est écoulée depuis une dernière mesure.
  13. Lave-linge (1) avec une cuve de lavage (2), un tambour (3) pour l'accueil du linge (4), un moteur d'entraînement (5) pour le tambour (3), un dispositif de commande (8) pour la commande d'au moins un processus de lavage, et avec un capteur d'impédance (9, 10) disposé dans le lave-linge (1), lequel capteur entre en contact avec un fluide aqueux (7) au cours d'un processus de lavage, dans lequel le dispositif de commande (8) est aménagé pour l'exécution d'un procédé dans lequel un signal d'impédance est mesuré, caractérisé en ce que le dispositif de commande (8) est aménagé afin d'exécuter un procédé dans lequel le signal d'impédance est évalué quant à des dépôts sur le capteur d'impédance (9, 10) comme mesure pour le degré d'hygiène H du lave-linge (1), et en ce que le dispositif de commande (8) est aménagé afin de mesurer, avant l'exécution d'un premier traitement du linge dans le lave-linge (1), en présence d'eau (7) un signal d'impédance du capteur d'impédance (9, 10) et de l'enregistrer dans le dispositif de commande (8) comme mesure de référence correspondant à un degré d'hygiène maximal Hmax, dans lequel un lien entre le signal d'impédance et le type et/ou la quantité de dépôts sur le capteur d'impédance (9, 10) est enregistré dans le dispositif de commande (8).
  14. Lave-linge (1) selon la revendication 13, caractérisé en ce que le capteur d'impédance (9, 10) est disposé dans une moitié arrière de la cuve de lavage (2), une moitié inférieure d'une pochette de chauffage disposée dans la cuve de lavage (2) et/ou sur le côté arrière du tambour (3).
EP16709448.1A 2015-03-13 2016-03-11 Procédé de détermination du degré d'hygiène d'un lave-linge comprenant un capteur d'impédance, ainsi que lave-linge pour la mise en oeuvre de ce procédé Active EP3268531B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102015204535 2015-03-13
DE102015204692.3A DE102015204692A1 (de) 2015-03-13 2015-03-16 Verfahren zur Bestimmung eines Hygienegrades einer Waschmaschine mit einem Impedanzsensor sowie hierzu geeignete Waschmaschine
PCT/EP2016/055277 WO2016146521A1 (fr) 2015-03-13 2016-03-11 Procédé de détermination du degré d'hygiène d'un lave-linge comprenant un capteur d'impédance, ainsi que lave-linge pour la mise en oeuvre de ce procédé

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EP3268531A1 EP3268531A1 (fr) 2018-01-17
EP3268531B1 true EP3268531B1 (fr) 2020-07-15

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EP (1) EP3268531B1 (fr)
CN (1) CN107407031B (fr)
DE (1) DE102015204692A1 (fr)
WO (1) WO2016146521A1 (fr)

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DE102016220011B4 (de) * 2016-10-13 2023-03-30 Volkswagen Aktiengesellschaft Kraftfahrzeug, insbesondere ein autonom fahrbares Kraftfahrzeug
DE102018005896B4 (de) * 2018-07-26 2020-07-09 Emz-Hanauer Gmbh & Co. Kgaa Elektrisches Haushaltsgerät mit Messeinrichtung zur Impedanzspektroskopie
DE102020117844A1 (de) 2020-07-07 2022-01-13 Rational Aktiengesellschaft Reinigungschemiebausystem und Gargerät
EP3944764A1 (fr) * 2020-07-28 2022-02-02 BSH Hausgeräte GmbH Appareil ménager et procédé de fonctionnement associé

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DE102015204692A1 (de) 2016-09-15
CN107407031A (zh) 2017-11-28
EP3268531A1 (fr) 2018-01-17
WO2016146521A1 (fr) 2016-09-22
CN107407031B (zh) 2020-04-21

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