WO2012139920A1

WO2012139920A1 - Method for identifying and displaying a level of hygiene of laundry and/or of the laundry treatment appliance in a laundry treatment appliance, and a laundry treatment appliance which is suitable for said method

Info

Publication number: WO2012139920A1
Application number: PCT/EP2012/056016
Authority: WO
Inventors: Dirk Dedekind; Andreas Hanau; Julia SANNER; Hartmut Schaub
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2011-04-12
Filing date: 2012-04-03
Publication date: 2012-10-18
Also published as: EP2697418A1; CN103476982A; PL2697418T3; CN103476982B; RU2013145619A; DE102011007170A1; EP2697418B1; RU2560267C2

Abstract

The invention relates to a method for identifying and displaying a level of hygiene of laundry 7 in a laundry treatment appliance 1 which has a container 3 for accommodating laundry 7 which is to be treated, has a control device 12 which is designed to carry out a plurality of selectable laundry treatment programmes, and has a display apparatus 29, wherein a level of hygiene H_res which is predicted after a laundry treatment programme has been selected and/or a level of hygiene H_res of the laundry 7 which results after a selected laundry treatment programme has been executed is displayed on the display apparatus 29 as a signal S1. The method also comprises steps for determining the predicted or resulting level of hygiene H_res of the laundry 7 taking into consideration a prespecified or determined initial level of hygiene H_orig and/or the selected laundry treatment programme. The invention also relates to a laundry treatment appliance 1 which is suitable for carrying out this method.

Description

A method for detecting and displaying a degree of hygiene of the laundry and / or the laundry treatment appliance in one

Laundry treatment device and suitable for this purpose

Laundry treatment device

The invention relates to a method for detecting and displaying a degree of hygiene of laundry in a laundry treatment appliance and a particularly suitable laundry treatment appliance. Recently, there has been a trend for washing laundry at a low temperature. The improvement of detergents and washing machines enables a good removal of soiling even at low temperatures. In addition, the washing at low temperatures is increasingly dictated by the textile industry, since many laundry items should be washed after washing instructions only at 30 ° C or 40 ° C. In addition, washing at low temperatures saves energy and thus protects the environment. For many consumers, however, the question arises as to whether a sufficiently high degree of hygiene is achieved during a washing process at low temperatures. Microwave germs, in contrast to soiling, are generally invisible and can threaten health. If a washing machine is operated mainly in the low temperature range and with mild detergents, contamination and formation of a biofilm in the washing machine can occur. In addition, during a washing process, cross-contamination may take place if heavily contaminated laundry items are washed together with slightly contaminated items of laundry in the same washing operation, after which the germ content of the previously slightly contaminated items of laundry has risen. Although many of the microbial germs found in household linen are not pathogenic to humans, special care should be taken in the home, in the care of the elderly, babies and toddlers, and generally heavily contaminated items such as kitchen towels. In such cases, an increased level of hygiene appears appropriate, which requires increased decontamination during the washing process. In order to achieve the highest possible degree of hygiene, various modifications to laundry treatment appliances have hitherto been known. Particularly in the industrial sector, for example in the cleaning of special workwear (such as surgical gowns), highly specialized washing processes up to sterilization are used. In laundries and nursing homes, for example, there are also special "hygiene washing machines." In the household sector, special washing machines with programs with additional rinses are offered in view of the increased demand for high standards of hygiene, for example in the case of allergic persons or in households with small children.

Moreover, in the course of using laundry treatment appliances, particularly water-bearing laundry treatment appliances, the hygiene condition due to the formation of deposits and biofilms generally deteriorates. Biofilms contain immobilized bacterial cells embedded in a polymer matrix of microbial origin and, in addition to microorganism cells, may contain abiotic or inorganic components in greater amounts, all being held together by mucus formed by bacteria. The water content is relatively high with generally 80 to 95% of the moisture content. This fact also influences the hygiene level of laundry in a laundry treatment appliance.

To improve the hygienic condition of a laundry treatment appliance, a special hygiene program is sometimes activated in which, for example, using steam and / or provided with bioactive additives liquids or gases cleaning of the relevant parts of the laundry treatment appliance is performed. However, the hygiene programs are not optimally adapted to the hygienic needs of the laundry treatment appliances, since the time, duration and intensity of the measures carried out in a hygiene program are not adjusted to the actual hygiene status in the laundry treatment appliance. It would therefore be desirable to obtain qualitative and in particular also quantitative information on the degree of hygiene of the laundry treatment appliance and in particular the degree of hygiene of the laundry contained in it.

DE 102 37 854 A1 discloses a washing process in which a quantity of ozone enters, exits and discharges into a subset of the cleaning liquid and the amount of discharged ozone is compared and compared with the amount of ozone introduced to decide whether the cleaning process can be stopped.

No. 2005 0 268 404 A1 shows a washing method in which, after ozone treatment by measuring the ozone content, the degree of hygiene of the laundry is determined and, if the level of hygiene falls below a certain level, further use of the machine is prevented.

DE 196 20 512 A1 discloses a washing machine with a display element, with which the user can be signaled whether in the last program a heating of the washing liquid to a minimum temperature or the implementation of a hygiene program is recommended.

EP 2 108 726 A2 likewise shows a washing machine with a display element which serves to indicate to the user, depending on various parameters of the operating programs that have been run, that it is advisable to carry out a degermination program.

Against this background, the object of the invention is to provide a method for detecting and displaying a degree of hygiene of laundry in a laundry treatment appliance, with which the degree of hygiene can be determined and displayed in a manner advantageous to a user, wherein the user preferably also has one

Possibility of taking into account different starting situations, e.g. the degree of contamination of the laundry with germs, as well as diseases or sensitivities of the wearer of the laundry, can be given. Besides, it is

Object of the invention, a particularly suitable for carrying out this method

To provide laundry treatment device.

The object underlying the invention is achieved by a method and a laundry treatment appliance according to respective independent claim. Preferred embodiments of the invention are listed in the respective dependent claims, whose features can be used in the invention in any combination. Preferred embodiments of the laundry treatment appliance according to the invention correspond to preferred Embodiments of the method according to the invention, even if it is not separately pointed out here.

The invention thus relates to a method for detecting and displaying a degree of hygiene of laundry in a laundry treatment appliance and / or the laundry treatment appliance, which comprises a container for receiving laundry to be treated, a control device which is designed to carry out a plurality of selectable laundry treatment programs, and a display device wherein a hygiene level H _res predicted after a selection of a laundry treatment program or a hygiene level H _{res of} the laundry resulting after the passage of a selected laundry treatment program is displayed on the display device as a signal S1. Below, the predicted degree of hygiene H _{res is} also understood as the resulting degree of hygiene H _res . The resulting level of hygiene H _res of the laundry is preferably determined taking into consideration a predetermined or learned initial hygiene degree H _or strength and / or the selected laundry treatment program. In a preferred embodiment of the invention, a difference .DELTA.Η between the resulting hygiene level H _{res of} the laundry and a desired degree of hygiene H _{tar of} the laundry on the display device is displayed as the signal S1, in particular the difference .DELTA.Η is displayed when the difference ΔΗ = (H _re s htar) ^ 0.

According to the invention, the degree of hygiene is greater when a number of germs on the laundry is lower. Hygienic grade in the sense of the present invention is thus understood to mean the degree of contamination of the laundry with germs. The definition of the degree of hygiene is otherwise not limited.

The degree of hygiene of the laundry can thus be indicated, for example, as the number of germs per cm ² , ie germs / cm ² , on the surface of the laundry and determined in various ways. In a preferred embodiment of the method, therefore, the number n of germs per cm ^{2 of} the surface of the laundry is used as a measure of the degree of hygiene. In the context of the invention, the size of the nucleating unit known from microbiology is known in the context of the invention for quantitative data under one germ. KBE) or colony-forming unit (CFU). Depending on the method of determination, other parameters may be used to indicate the degree of hygiene.

Thus, a degree of hygiene can be determined, for example, by using a biosensor, which can preferably specifically indicate the presence and the number of germs. This can be done, for example, by adding laundry in the laundry treatment appliance with a certain amount of an aqueous liquid and examining the resulting solution with the biosensor. Alternatively or in addition, by changing a concentration or amount of a disinfecting agent such as e.g. Ozone of the degree of hygiene can be determined. In this case, it makes sense to exclude or minimize a possible influence of inorganic or organic non-living impurities. This could be done, for example, by setting a degree of contamination with such inorganic or organic impurities that can already be visually determined by a user by a user or by means of any sensors present in the laundry treatment appliance.

Furthermore, an initial degree of hygiene of the laundry treating appliance can be estimated from the history of the previous laundry treatment programs. It is assumed that, for example, in a sequence of so-called cold wash programs can accumulate over time in the laundry treatment device germs, since such programs have only a lower germ reduction effect than programs with a treatment temperature of greater than or equal to 60 ° C. Cold wash programs are laundry treatment programs with a treatment temperature of less than or equal to 30 ° C. In addition to the treatment temperature, the duration of treatment and the treatment agents used, in particular the detergents, of the previous laundry treatment programs also have an influence on the degree of hygiene in the laundry treatment appliance. Thus, in order to determine the degree of hygiene of the washing machine, the setting and operating parameters of the previous laundry treatment programs stored in the control device, for example the program selection, the treatment temperature, the program duration, the amount of laundry, the amount of water used, optionally selected special functions and / or the type and / or Amount of the treatment agent used to be evaluated. A hygiene grade of the laundry treatment appliance determined or estimated from the setting and operating parameters is used, for example, for B. as a measure of the initial level of hygiene H _or Ig Further, a level of hygiene of laundry and / or the laundry treatment appliance can be determined by measuring the time decay of ready gestelltem in the laundry treatment device for contact with the laundry ozone is measured using an ozone sensor, z. For example, as a measure of the initial degree of hygiene H _or ig- this example, the laundry-containing container of the laundry treatment device is applied to a quantity Mi of ozone and the decrease ΔΜ of the amount Mi of ozone after a predetermined time t _se t with an ozone sensor (b) and / or an ozone sensor (c). Preferably, in this case, in the container of the laundry treatment device, a predetermined concentration c _se t adjusted to ozone and evaluated with a arranged in this container ozone sensor (c) time decrease in the concentration c of ozone as a measure of the degree of hygiene of the laundry. In this case, a decay constant λ of the ozone, corrected for the natural decomposition of the ozone, is advantageously used as a measure of the degree of hygiene.

The fact that a predetermined concentration c _se t of ozone is set in the container of the laundry treatment appliance can also mean, in particular, that an ozone-containing gas mixture or an ozone-containing liquid of unknown concentration of ozone is introduced into the container and initially mixed with the ozone sensor (c). the concentration c _s t is measured on ozone. In a further preferred embodiment of the method, at a predetermined flow rate v _{set of} an ozone-containing gas mixture or an ozone-containing liquid at an input to the container of the laundry treatment device, a concentration c _in predetermined and the concentration c _ou t at the output from the container with a Ozone sensor (b) was measured, and the concentration difference Äc = c _in - c _ou t - Ac _dec , where Äc _{dec is} a measure of the natural decomposition of ozone, evaluated to determine the hygiene level of the laundry.

The fact that "at an input to the container of the laundry treatment appliance, a concentration c _in at ozone is specified", may in particular also mean that a Ozone-containing gas mixture or an ozone-containing liquid of unknown concentration of ozone is brought to the input and first with the ozone sensor (a) the concentration c _in of ozone is measured. These methods can be used, for example, to determine the initial degree of hygiene of Hong. In a preferred embodiment of the method according to the invention, therefore, the initial degree of hygiene H _ori g is determined using at least one sensor, in particular a biosensor or an ozone sensor.

Alternatively or in addition thereto, empirical _values for the initial _{degree of} hygiene Η _{οη9 can be} assumed, for example an average value for the degree of hygiene of laundry to be treated of 10 ⁸ germs / cm ² . It can also be considered that the hygiene level of tea towels and underwear is generally worse than that of outerwear.

Possibly. A combination of different methods for determining the initial degree of hygiene H _or strength may be used. In the above embodiment of the method according to the invention is a predicted according to a selection of a laundry treatment program, level of hygiene H _res or after the expiry of the selected laundry treatment program, resulting level of hygiene H _res of the laundry and / or the laundry treatment appliance taking into consideration a predetermined or learned initial hygiene degree H _or ig and selected laundry treatment program determined, wherein preferably a difference .DELTA.Η between the resulting hygienic level H _{res of} the laundry and / or the laundry treatment appliance and a desired degree of hygiene H _{tar of} the laundry is displayed on a display device as a signal S1. Preferably, the signal S1 is displayed when ΔΗ = (H _re s-Htar) ^ 0.

The laundry treatment program will depend on the type of laundry treatment device. With a washing machine it will be in the Usually a washing program and a dryer for a drying program.

In a washing program is usually after wetting the laundry to be treated, especially laundry to be washed, the laundry using a detergent and a predetermined amount of water at a likewise predetermined temperature profile for a certain period of time washed. In addition, various rinsing steps may be provided. Finally, the container is moved in a predetermined manner with the laundry, usually a rotatable drum, during a washing program, which generally also includes rinsing steps. In particular, speed, direction of rotation, downtime and / or movement times of a drum can be selected differently. The influence of these factors on an initial degree of hygiene H _or ig is generally either known or can be determined by experiments, so that for different washing programs a resulting level of hygiene H _res can be determined.

The same applies to a dryer, whereby in particular the temperature and drying time chosen for the drying determine the resulting degree of hygiene H _res . In a preferred embodiment of the method, a relationship between the resulting hygienic level H _res and the selectable laundry treatment programs is therefore stored in the control device of the laundry treatment device for predetermined values of the initial hygiene level Hörig. In this case, it is again preferred that in the case of a washing machine or a washer dryer in the selectable laundry treatment programs, a relationship between the type and amount of a detergent used, a temperature profile and / or a movement program of the container and the resulting degree of hygiene H _{res of} the laundry are stored.

The container for receiving laundry to be treated according to the invention is generally a drum rotatable about a horizontal or vertical axis, preferably a horizontal axis. Therefore, "movement program of the container" generally means a succession of rotation and standstill phases of the drum, in which the rotation speed of the drum may be different during rotational phases of the drum first rotated in one direction and then, if necessary, after a short break, again rotated in the other direction, this process can be repeated several times.

Generally, a desired level of hygiene is to be H _tar achieved after carrying out a laundry treatment program. The desired degree of hygiene H _tar may differ, depending on whether the laundry to be treated is intended for example for the sick, the elderly or babies. Accordingly, therefore, the laundry treating appliance is preferably arranged so that a user of the laundry treating appliance can input the hygienic degree H _tar . Therefore, depending on the degree of hygiene H _tar, a different difference ΔΗ = (H _r es -Ht _ar ) can result.

In a preferred embodiment of the method according to the invention, therefore, with a determined difference ΔΗ = (H _r es -Ht _ar ) <0, the selected laundry treatment program is modified in order to increase the resulting hygiene level H _res until the difference ΔΗ = (H _re sH _ta r) ^ 0 holds.

, Modification of the laundry treatment program as used herein means in particular that one of the above-mentioned parameters such as temperature, motion program of the drum, length of the program and its steps are modified such that the desired level of hygiene is H _tar reached at least.

In a preferred embodiment of the method, a type and / or amount of a detergent is determined by means of a detergent sensor in the laundry treatment appliance and the selected laundry treatment program is modified accordingly.

In a further preferred embodiment, a set and automatically set by a user of the laundry treatment device type and / or amount of laundry is taken into account. A difference ΔΗ = (H _re s-Htar) <0 between the resulting hygiene level H _res and a desired degree of hygiene H _tar on the display device is preferably displayed on the display device as signal S2, which differs locally, visually and / or acoustically from signal S1.

The display device may for example consist of one or more LEDs, which may indicate a degree of hygiene H _{res of} the laundry, if necessary by lighting or non-lighting or by displaying different colors. Alternatively or in addition to this, for example, a liquid crystal display may be present.

The invention also relates to a laundry treatment appliance having a container for receiving laundry to be treated, a control device which is designed to carry out a plurality of selectable laundry treatment programs, and a display device, wherein the display device at least one display element, in particular a display or at least one LED , which is set up to indicate a resulting hygienic level H _res . Preferably, the control means is arranged and the laundry treating appliance has means for carrying out a method of detecting and displaying a hygiene degree of laundry in the laundry treating appliance as described above.

The laundry treating appliance is generally a washing machine, a washer-dryer or a tumble dryer.

The laundry treatment appliance preferably contains as such means a device for providing ozone, in particular an ozone generator or else an opening or a buffer for an ozone-containing gas mixture or an ozone-containing liquid. Thus, the determination of a degree of hygiene on the consumption of ozone is possible. The control device of the laundry treatment appliance is then usually set up to determine a degree of hygiene by measuring the time reduction of ozone provided in the laundry treatment appliance as a measure of the degree of hygiene. Further means in the sense of the invention are sensors, for example a detergent sensor, an ozone sensor and / or a biosensor, a pump or a blower for setting a desired flow of an ozone-containing air or an ozone-containing gas, an ozone removal device and / or various controllable closure devices. To determine a degree of hygiene, a biosensor may be present in the laundry treatment appliance, for example, which can detect germs selectively in general.

The invention has the advantage that it is possible in a simple and efficient way to determine the hygiene level of laundry treatment equipment and display. Finally, the method according to the invention makes it possible to provide improved laundry treatment programs and hygiene programs, in particular for improving the degree of hygiene. Thus, a general improvement of the hygiene of the laundry is achieved, which also also for special user groups such. Allergy sufferers can be specifically improved. The invention makes it possible to also take into account a disease or sensitivity of a user wearing the laundry.

In addition, a user of the laundry treating appliance is relieved of his uncertainty as to whether a particular laundry treatment program, e.g. a specific wash program meets its hygiene requirements. For example, a baby clothes washing program can positively confirm the wash result, resulting in a more carefree washing and avoiding excessively high temperatures, which can save on laundry and reduce energy consumption "Scaled" degree of hygiene a user of the laundry treatment device to be given a positive confirmation also per se "less" hygienic laundry treatment programs.

A non-limiting embodiment of the invention is illustrated below with reference to the figures, wherein

Figure 1 is a schematic representation of the inventive washing machine and FIG. 2 shows by way of example the relationship between the degree of hygiene and the treatment temperature.

As an example of a laundry treatment appliance according to the invention, a washing machine is cited. 1 shows schematically the presently relevant parts of a washing machine, in which a method to be explained below can be performed. The washing machine 1 shown in FIG. 1 has a tub 2 in which a drum 3 can be rotatably mounted as a container for laundry 7 about a horizontal axis of rotation 4 and can be operated by a drive motor 14. The arrow indicates here the direction of rotation of the drum 3. In the drum 3 Wäschemitnehmer 34 and 5 Schöpfeinrichtungen 5 for the wash liquor 6 are on the inner surface of the drum shell available.

The washing machine 1 also has a water supply system, which in a water supply 8 arranged a water connection fitting, not shown here for the domestic water network, an electrically controllable valve 9 and a Waschmitteleinspüleinrichtung ("Einspülschale") 11.

The water coming via the water supply line 8 can be transported via the dispenser 1 1 there detergent portions via the connecting tube 10 in the tub 2.

The washing machine of Figure 1 allows the determination of a degree of hygiene of laundry by the consumption of germs killing ozone. For this purpose, a Venturi nozzle 26 is located in the water supply line 8, which in the embodiment shown here is connected via an ozone supply line 25 to an ozone generator 32. The ozone generator 30 air is supplied in a supply air duct. About the venturi 26 sucks in the water supply 8 flowing water from the domestic water network in the ozone supply line 25 located, ozone-containing air. As a result, ozone passes together with water in the dispenser 11 and then in the tub 2 and the laundry 7 in the drum 3. However, ozone can be introduced in principle as a gas. FIG. 2 schematically shows the relationship between the degree of hygiene H achievable with a laundry treatment program with reference to the parameter treatment temperature T. The horizontal axis of the diagram shown in Figure 2 represents the treatment temperature T in ° C of a laundry treatment program and on the vertical axis of the achieved degree of hygiene of the laundry after performing a laundry treatment program with the treatment temperature T shown in Figure 2 is plotted. Here, the degree of hygiene in percent of the remaining on the laundry after treatment germs of a normal with germs loaded laundry. It is assumed that a piece of laundry normally loaded with germs has 100,000,000 germs per square centimeter of laundry area. The functional relationship between the degree of hygiene H and the treatment temperature T shown in FIG. 2 is only intended to describe the relationship qualitatively. Further, in addition to the treatment temperature T further operating parameters, such as treatment duration or type and amount of the treatment agent, the degree of hygiene H influence.

Such basic relationships between the degree of hygiene H, here understood as a predetermined degree of hygiene H _or ig, and the individual setting and / or operating parameters are stored in a control device 12. Depending on a selection of a laundry treatment program and, if appropriate, additional additional functions, a resulting hygiene level H _{res can be} predicted from the program or functions associated setting and / or operating parameters, which after selecting the laundry treatment program on a display device 29 of the laundry treatment device as a signal S1 is shown. Thus, immediately after the selection and before starting a laundry treatment program, an operator has the opportunity to check whether the predicted hygienic level H _res meets his expectations and, if necessary, to select another laundry treatment program. In a further embodiment, the washing machine into the figure 1, not shown, adjustment member, with which an operator can adjust the level of hygiene H _ori g of the to be treated laundering or a desired level of hygiene H pretend _tar with optionally a further adjusting member, which on the Display device 29 or another display device can be displayed. In the embodiment shown in FIG. 1, the dispensing tray 11 is connected to the tub 2 via a connecting tube (filling hose) 10. In addition, the dispenser 1 1 is connected via a first exhaust air duct 18 and the tub 2 via a second exhaust air duct 19 with an exhaust duct 17. In the first exhaust air duct 18 is also a first controllable closure device 33, such as flaps.

Ozone-containing air or ozone-containing aqueous liquid from the ozone generator 32 can pass through the dispensing dish 11 and the connecting tube 10 into the tub 2 and into the drum 3. Germs on the laundry located in the drum 3 7 are attacked by the ozone. This reduces the content of ozone in the air or in the aqueous liquid beyond the extent due to the natural decomposition of the ozone, so that the consumption of ozone can be used as a measure of an initial degree of hygiene H _or ig the laundry.

Before the dispenser 1 1, an ozone sensor (a) 16 is arranged, with the aid of which in the embodiment shown here at a set by means of a suction pump 21 flow velocity v _se t a concentration c _in ozone before the dispenser 1 1 can be measured as Reference value for a subsequent decrease in the ozone concentration is used. The means of an ozone sensor (b) 27 determined concentration c _ou t of ozone can be used to determine the decrease in ozone concentration due to the killing of germs. The position of the ozone sensor (b) 27 is considered here as the output from the to be examined, laundry 7 containing drum 3. After measuring the concentration c _ou t at the outlet 27 from the drum 3 with the ozone sensor (b) 27, the concentration difference Äc = c _in -c _ou t -ec _dec , where A _{dec is} a measure of the natural decomposition of ozone, evaluated to determine the degree of hygiene of the laundry. For this purpose, for example, ozone-containing air at an open second controllable closure device 35 and a closed first controllable closure device 33 through the tub 2 and the second exhaust air duct 19 into the exhaust duct 17 pass. The ozone concentrations are measured by ozone sensor (a) 16 and ozone sensor (b) 27. The embodiment of the laundry treating machine shown in Figure 1 also permits a specification of an initial hygiene degree H _or strength of the laundry using a value can be set by default, possibly taking into account the type of washing employed (underwear, towels, etc.) which, if necessary, by a user can be set on the laundry treatment appliance.

The embodiment shown here also allows a determination of the degree of hygiene of the laundry via a direct measurement in the drum 7 containing the laundry 7. For this purpose, an ozone sensor (c) 24 is arranged in the drum 3. In the drum 3 can be adjusted by introducing a known amount or concentration of ozone, a predetermined concentration c _se t of ozone. Alternatively, an ozone concentration initially determined by the ozone sensor (c) 24 may also be assumed as the reference point c _se t. In any case, to determine a degree of hygiene of the laundry 7, the time decrease of the concentration c of ozone measured with the ozone sensor (c) 24 is evaluated. Since ozone can also react with lifeless contaminants of the laundry, contamination of the laundry with dirt should preferably be taken into account.

In addition to the laundry 7, an aqueous liquid 6, in which a biosensor 15 is located for the qualitative and quantitative detection of germs, is indicated in the drum 3.

In the exhaust duct 17 there is an ozone removing device 20, which contains a filter unit containing activated charcoal 28, and a suction pump 21. The ozone-containing air sucked in by the induction bowl 1 1 and the tub 2 by means of the suction pump 21 passes into the ozone removal device to remove excess ozone 20 and the clean air via an exhaust outlet 22 in the installation room of the washing machine 1. The suction pump 21 is disposed in the exhaust duct 17 between the ozone removing device 20 and the exhaust outlet 22. An ozone sensor (d) 31 for measuring an ozone content is disposed between the ozone removing device 20 and the suction pump 21. A proper functioning of the ozone removing device 20 is present when the ozone sensor (d) 31 can detect no or only extremely small amounts of ozone. For carrying out the method according to the invention in the washing machine, a resulting degree of hygiene H _{res of} the laundry 7 is determined, which is displayed as a signal S1 on a display device 29. The display of the resultant hygiene degree H _res lingerie 7 can be determined and is given to the selection of a washing program and / or after expiry of a selected laundry treatment program, taking account of a predetermined or as described previously determined initial hygiene degree H _or strength and / or the selected laundry treatment program. The signal S1 indicates the predicted or determined resulting hygienic grade H _res . In one embodiment, the signal S1 can be determined from a difference ΔΗ between the resulting hygiene level H _{res of} the laundry and a previously entered desired degree of hygiene H _{tar of} the laundry 7, ie ΔΗ = H _re s-Htar, preferably as the signal S1, the positive difference ΔΗ is understood (ΔΗ = H _re s-Htar ^ 0). The display device 29 is used for acoustic and / or visual indication of the degree of hygiene.

In addition, in the case of the washing machine shown in FIG. 1, a difference ΔΗ = (Hres-Htar) <0 between the resulting hygiene level H _{res of} the laundry and a desired degree of hygiene H _tar , on the display device 29 as signal S2, which varies locally, visually and / or acoustically different from signal S1.

With a determined difference ΔΗ = (Hr _es -Htar) <0, the selected laundry treatment program is modified here in order to increase the resulting hygienic level H _res until the difference ΔΗ =

0 applies.

The valve 9 as well as the heater 13 can be controlled by a control device 12 in response to a flowchart which relates to a time program and / or to the achievement of certain measured values of parameters such as liquor level, liquor temperature , Speed of the drum, etc. may be bound within the washing machine. In addition, the signals from the drive motor 14, biosensor 15, ozone generator 32, suction pump 21, ozone sensor (a) 16, ozone sensor (b) 27, ozone sensor (c) 24 and ozone sensor (d) 31 are fed to the control device 12, even if for reasons the clarity is not shown in each case. LIST OF REFERENCE NUMBERS

1 washing machine

2 tubs

3 drum, container for laundry

4 rotation axis

5 scooping device

6 aqueous liquid

7 laundry

8 water supply (from the domestic water network)

9 electrically controllable valve

10 connecting pipe (filling hose for lye / water)

11 detergent dispenser (dispenser tray)

12 control device

13 heating

14 drive motor

15 biosensor

16 ozone sensor (a)

17 exhaust duct

18 first partial exhaust duct

19 second partial exhaust duct

20 Ozone removal device

21 suction pump

22 exhaust air outlet

23 drain pump

24 ozone sensor (c)

25 ozone supply line

26 Venturi nozzle

27 ozone sensor (b)

28 filter unit

29 display device

30 Supply air duct for the ozone generator

31 ozone sensor (d) Ozone generator, device for providing ozone First controllable closing device, flap

laundry agitator

Second adjustable closure device, flap

Claims

Method for detecting and indicating a degree of hygiene of laundry (7) in a laundry treatment appliance (1) and / or the laundry treatment appliance (1) comprising a container (3) for receiving laundry (7) to be treated, a control device (12) is configured for carrying out a plurality of selectable laundry treatment programs, and has a display device (29), characterized in that a hygiene level H _{res of} the laundry (7) and / or of the laundry treatment device (1) predicted after selection of a laundry treatment program is displayed on the display device (29). is displayed as a signal S1.

A method according to claim 1, characterized in that the resulting degree of hygiene H _{res of} the laundry (7) and / or the laundry treatment appliance (1) is determined taking into account a predetermined or determined initial hygiene grade Hong and / or the selected laundry treatment program.

A method according to claim 1 or 2, characterized in that a difference ΔΗ between the resulting hygienic level H _{res of} the laundry and a desired degree of hygiene H _{tar of} the laundry (7) and / or the laundry treatment appliance (1) on the display device (29) as a signal S1 is displayed.

Method according to one of claims 1 to 3, characterized in that in the control device (12) at least one setting and / or operating parameters of past laundry treatment programs are stored and from the setting and / or operating parameters of previous laundry treatment programs an initial degree of hygiene H _or ig is determined.

Method according to one of claims 1 to 4, characterized in that in the control device (12) for predetermined values of the predetermined or initial degree of hygiene H _ori g a relationship between the resulting degree of hygiene H _{res of} the laundry and / or the laundry treatment appliance (1) and the selectable laundry treatment programs is deposited. Method according to one of claims 1 to 5, characterized in that using at least one sensor (15) the initial degree of hygiene H is determined H _or ig.

A method according to claim 6, characterized in that the initial degree of hygiene is determined H _or ig by means of an ozone sensor (16,24,27), the time reduction of the laundry treatment device (1) for contact with the laundry (7) and / or Parts of the laundry treatment device (1) ozone is measured as a measure of the initial degree of hygiene H _or ig.

A method according to claim 7, characterized in that the laundry (7) containing container (3) of the laundry treatment appliance (1) is acted upon by a quantity Mi of ozone and the decrease ΔΜ of the amount Mi of ozone after a predetermined time t _set with an ozone sensor (b) (27) and / or an ozone sensor (c) (24) is measured.

A method according to claim 8, characterized in that in the container (3) of the laundry treatment appliance (1) a predetermined concentration c _{set is set} to ozone and with a in this container (3) arranged ozone sensor (c) (24) measured time decrease the concentration c of ozone as a measure of the degree of hygiene of the laundry and / or the laundry treatment appliance (1) is evaluated.

A method according to claim 9, characterized in that a decay constant λ of the ozone, corrected for the natural decomposition of the ozone, is used as the degree of hygiene.

Method according to one of claims 1 to 10, characterized in that as a measure of the degree of hygiene of the laundry and / or the laundry treatment appliance (1) the number n of germs (CFU) per cm ² on the surface of the laundry and / or the laundry treatment appliance ( 1) is used. Method according to one of claims 1 to 11, characterized in that the selected laundry treatment program is modified with a difference found ΔΗ = (H _re s-htar) <0, in order to increase the resultant level of hygiene H _res until the difference ΔΗ = (H _re s-Htar) ^ 0 holds.

Method according to one of claims 1 to 12, characterized in that a difference ΔΗ = (H _re s-Htar) <0 between the resulting degree of hygiene H _res and a desired degree of hygiene H _tar , on the display device (29) as a signal S2, which especially is different locally, visually and / or acoustically different from signal S1, is displayed.

A laundry treatment appliance (1) comprising a container (3) for receiving laundry (7) to be treated, a control device (12) designed to carry out a plurality of selectable laundry treatment programs, and a display device (29), characterized in that Display device (29) at least one display element, in particular a display or at least one LED, which is set up to display a predicted degree of hygiene H _res .

Laundry treatment appliance (1) according to claim 14, characterized in that the control device (12) is adapted thereto and the laundry treatment appliance (1) comprises means (16,27,24,31, 21, 35) to provide a method for predicting and displaying a Hygienegrades of laundry (7) in the laundry treatment appliance (1) according to one of claims 1 to 14 perform.