WO2015082281A1

WO2015082281A1 - Method for treating laundry with an improved wetting phase, and washing machine suitable for this purpose

Info

Publication number: WO2015082281A1
Application number: PCT/EP2014/075671
Authority: WO
Inventors: Meike Hempel; Krzysztof LUBOSZ; Kathrin Redlin; Steffen Weissbach
Original assignee: BSH Hausgeräte GmbH
Priority date: 2013-12-06
Filing date: 2014-11-26
Publication date: 2015-06-11
Also published as: EP3077580A1; CN105829596B; DE102013225113B4; RU2643134C2; CN105829596A; EP3077580B1; DE102013225113A1

Abstract

The invention relates to a method for operating a washing machine for treating laundry (7), having a drum (2) mounted in a rotatable manner in a tub (1), having a drive motor (14) for the drum (2), having a control device (12), having a water-supply system (8, 9, 10, 11), having a measuring device (18) for determining a quantity of aqueous liquid (6) introduced into the tub (1), having a heating device (13) for heating the aqueous liquid (6) in the tub (1), and having a temperature sensor (17), wherein the following steps are carried out: (a) introducing a first quantity q₁ of aqueous liquid (6) at a temperature T_q1 into the tub (1); (b) heating the quantity q₁ of aqueous liquid (6) to a predetermined temperature T ₁ > T_q1; wherein the quantity q₁ can be introduced in one dose or in a state in which it is divided into a number of sub-quantities q_1', and the operation of heating to the temperature T₁ can begin following the introduction of q₁ or after one or more sub-quantities q_1' have been added, wherein q₁ and a first sub-quantity q_1'' introduced are each greater than a quantity q_min, which is necessary for covering the heating device (13); (c) adding a second aqueous quantity q₂ at a temperature T_q2 < T₁ to the heated aqueous quantity q₁; and (d) carrying out a washing phase with the laundry (7) in the presence of a detergent. The invention further relates to a washing machine suitable for implementing said method.

Description

Method of treating laundry with improved

Wetting phase and suitable washing machine

The invention relates to a method for the treatment of laundry in a washing machine with improved wetting phase and a washing machine suitable for this purpose. In particular, the invention relates to a method for operating a washing machine for treating laundry with a drum rotatably mounted in a tub, a drive motor for the drum, a control device, a water supply system, a measuring device for determining an amount of aqueous liquid introduced into the tub Heating device for heating the aqueous liquid in the tub and a temperature sensor, and a particularly suitable for this purpose washing machine.

In a washing process in a washing machine, a wetting phase takes place before the actual washing phase, in which the dry items of laundry are wetted with water or washing liquor. Subsequently, heating usually takes place to a desired washing temperature and the actual washing phase begins.

However, it should be noted that a washing process in a washing machine should be as energy-efficient as possible. Since in a washing process, in particular the heating of the water used consumes a lot of energy, it is desirable to reduce the energy to be used for this purpose.

The energy used in a washing process is used in particular for heating the water used for the actual washing phase. In addition, energy is used for the control of the washing machine and the operation of a drain pump and the drive of the drum. In order to meet demands for a further reduction of the energy to be used in a washing process, it is therefore desirable to reduce the amount of energy necessary for these steps.

It would therefore be desirable to provide an energy efficient method for treating laundry in a washing machine in the laundry to be washed if possible at a predetermined washing temperature, especially at a high washing temperature such as 60 ° C, can be treated.

DE 10 2005 012 426 A1 describes a wetting process for laundry in a program-controlled washing machine, which can be adjusted to the amount of laundry in a washing drum rotatably mounted in a tub about a non-vertical axis by means of a water supply system and a control device, through which the supply of water in time in the tub is controlled, and in a first phase (Ph1) starts with an inlet of a first measured amount of water in the tub at dormant or permanent rotating laundry drum. In this case, the laundry drum in the first phase (Ph1) is driven so long at least substantially continuously with the supply of water, until due to the measurement signals on the accumulated amount of water substantially no more Saugverhalten can be determined, and in a second phase (Ph2) at least in Substantially driven continuously and filled a further amount of water until the level in the tub a due to the in the first phase (Ph1) recognized water level profile with respect to maximum height and rate of change of the water level (N) and with respect to falling back of the level due to ingestion of the water through determined the laundry or reached a level of water level detected by an expert system within the second phase (Ph2) during the filling and subsequent intake of water through the laundry.

DE 10 2006 029 670 A describes a method for the treatment of laundry with a variable net duration and a washing machine suitable for this purpose. DE 10 2007 033 493 A describes a method for the treatment of laundry and a program-controlled washing machine suitable for this purpose, wherein u.a. wetting the laundry with an amount of water that is less than the amount of water required to saturate the laundry with water. Subsequently, a foam is produced, heated and washed the laundry with it.

DE 196 20 512 A describes a program-controlled washing machine with controls for setting at least distinguishable in the temperature washing programs, with the controls an automatically running hygienic program is selected, which includes heating the washing liquid to a predetermined minimum value, followed by cooling the washing liquid by adding cold water and pumping out the cooled washing liquid.

U.S. Patent 4,794,661 describes a method of treating laundry in a drum of a washing machine rotatably mounted in a tub prior to commencing a washing program. In this case, water is added to the tub from a hot water reservoir located outside the washing machine until it is partially filled to wet the laundry in the drum, the drum is rotated and the water in the washing machine circulates to the laundry in the drum Preheat the drum and the tub, so that no unwanted cooling of the wash takes place in a subsequent detergent addition and a washing phase takes place.

DE 10 2007 037 159 A1 describes a method for washing laundry in a washing machine with a tub in which a drum is rotatably mounted, with the washing (WA) phases in which the predetermined amount of water is heated to a predetermined temperature (T1) Rinsing (Ri) and final spin (FS), wherein the washing (WA) phase comprises a first section (WA1), which is carried out with a first amount of water at the predetermined temperature (T1), followed by a second section (WA2) connected, in which an additional amount of water is added to the first amount of water, wherein the increased amount of water in the second section is heated to a different predetermined temperature (T2).

DE 10 2012 023 084 A1 describes a method for washing items of laundry in a program-controlled domestic appliance for the care of laundry, in which a washing liquid present in a tub is heated, a washing temperature is set, laundry-specific and / or appliance-specific parameters are detected and dependent on the parameters, the heating of the washing liquid for setting a specific target temperature (Tz) is performed. During the net phase (A2), in which the washing liquid is supplied to the tub for wetting the laundry, a heating device for heating the washing liquid is activated and with the heating device, the washing liquid to a Mains phase temperature (Tn) is heated, which is smaller than the target temperature (Tz), which is assigned to a washing process selected by an operator.

DE 197 30 422 A1 describes a method for wetting laundry in a program-controlled drum washing machine for the household, the washing drum is rotatably arranged in a lye tub, which is equipped with a fresh water inlet, a water level controller and a detergent dispenser. The washing drum with the dry laundry is first brought to a speed forming a laundry ring, the washing drum then stopped and then supplied wetting liquid and possibly detergent. The free liquor in the bottom of the liquor vat is heated while the washing drum is still shut down to a predetermined temperature, after which a reversing process is initiated and the laundry is moistened with the preheated wetting liquid. Subsequently, the free liquor in the bottom of the liquor vat is heated to the set final wash program temperature.

Against this background, the object of the present invention was to provide a method for operating a washing machine, in which a washing process can be carried out in the most energy-efficient manner possible. In addition, the invention has for its object to provide a suitable for performing this method washing machine.

The solution of this object is achieved according to this invention by a method for operating a washing machine and by a washing machine for the treatment of laundry with the features of the corresponding independent claims. Preferred embodiments of the washing machine according to the invention and the method according to the invention are set forth in the corresponding dependent claims and the following description and the accompanying drawings. Preferred embodiments of the washing machine according to the invention correspond to preferred embodiments of the method according to the invention and vice versa, even if this is not explicitly stated herein.

The invention thus relates to a method for operating a washing machine for the treatment of laundry with a drum rotatably mounted in a tub, a drive motor for the drum, a control device, a water supply system, a measuring device for determining an amount of aqueous liquid introduced into the tub, a heater for heating the aqueous liquid in the tub and a temperature sensor, wherein the steps

(A) filling a first amount q-ι of aqueous liquid having a temperature T _q1 in the tub;

(b) heating the amount q-1 of aqueous liquid to a predetermined temperature, wherein the amount qi can be filled in one step or onto several portions q-1 'and heating to the temperature Ti after filling q-1 or already after addition of one or more subsets q-1 'can begin, wherein qi and a first filled subset qT' each greater than an amount q _min is required to cover the heater;

(c) adding a second amount of water q ₂ having a temperature T _q2 <Ti to the heated amount of water qi; and

(d) carrying out a washing phase with the laundry in the presence of a detergent.

The steps (a) to (c) are thus carried out in a wetting phase.

The term "aqueous liquid" herein means in particular water or wash liquor.

The predetermined temperature T-i is not particularly limited. However, T-i is preferably in the range of 30 to 60 ° C.

In a preferred embodiment of the method, the quantity qi is established as a function of a usable energy E _max and the predetermined temperature Ti, wherein a relationship between E _max , Ti and qi is stored in the control device.

The method according to the invention makes it possible to respond flexibly to the requirements of a laundry to be cleaned. So it may be useful to heat a quantity of water to be heated in one or more steps. In a preferred embodiment of the method, the amount qi of the aqueous liquid is heated in one step to the predetermined temperature ΤΊ. In this case, if the heated amount qi is brought into contact with the laundry for wetting, it can be heated relatively quickly. This may be advantageous in view of a reduced time requirement of a subsequent washing phase. However, in the case of a high predetermined temperature Ti, there is in principle the risk that certain impurities, in particular protein-containing soiling, are burnt into the laundry. Preferably, in the event that subsets q-ι 'are used, depending on a for heating q-ι in step (b) usable energy Eheating, which is smaller than a maximum usable for the process energy E _max , and the predetermined temperature Ti the subsets q-ι 'set, after the filling of which in the tub each heating takes place, wherein in the control device, a relationship between E _he ating, Ti and the subsets q-ι' is deposited. In this case, after the addition of the subsets q-1 'in each case be heated to the temperature Ti. However, a lower heating can also take place as long as the amount qi of aqueous liquid is heated to Ti overall in step (b). In a preferred embodiment of the method in step (d) a total amount q _to tai = not carrying out the washing phase qi + Σ q _n of aqueous liquid used, wherein the q _n in step (c) and (d) added subsets of aqueous liquid having a respective temperature T _qn <Ti, where n> 2. In this case, it is preferred that, in the case where the quotient qi / q _to tai falls below a predetermined value x, in the washing phase of step (d), the quantities q _n with n> 3 correspond to one dependent on the quotient qi / q _to tai Schedule to be added.

The total amount qi + q2 or generally q _to tai of aqueous liquid is preferably an optimum amount of water, which therefore leads to the highest washing effect at a certain entry of energy for heating the aqueous liquid. q _to tai can be predetermined or determined during the implementation of the method according to the invention. For example, during the process of the invention when using a pressure sensor to determine a water level in the tub from the pressure curve at lower amounts of water before, during and after heating the optimum amount of water can be determined. This is particularly dependent on a load of laundry, which can be determined for example by measuring the laundry weight.

The heater is generally off during step (c).

The timing of adding the detergent needed for the washing phase is not particularly limited. In general, the addition of the detergent takes place as early as possible in order to allow an optimal washing phase. Depending on the composition, it may be useful to either avoid relatively high temperatures or to discontinue them as early as possible. For example, enzymes in a detergent are often sensitive to excessive temperatures. On the other hand, bleaching agents for the development of a bleaching effect usually require higher temperatures.

In any case, a method is preferred according to the invention, in which the detergent for the washing phase (d) in q- _\ and / or q _{2 is} included.

Moreover, it is preferred in the method of the invention that, depending on the ratio qi / q _2, the amount of water q ₂ is chosen so that the temperature of the amount of water q-i + q _{2 is} not below a predetermined minimum value T _wash for the temperature of the aqueous Liquid falls. In this case, it is taken into account that the amount of water q-1 heated to Ti cools before the start of the washing phase due to the addition of the relatively cold amount of water q ₂ . It is then preferably ensured that a minimum temperature T _{wash of} the wash liquor is given for the wash phase.

The temperatures T _q1 and T _q2 are generally in the range of 5 to 18 ° C. The temperatures T _q1 and T _{q2 are} preferably the same and in particular have the temperature of a tap water used.

In a preferred embodiment of the method according to the invention, which is advantageous in particular in the presence of protein-containing contaminants of the laundry, the amount of water qi in step (b) is first to a Temperature T _P1 <Ti is heated and after wetting the laundry and any necessary filling of the amount of water in the tub on qi a heating of the aqueous liquid in the tub to a temperature T _P2 performed where T _P1 <T _P2 i Ti. In this case, the wetting of the laundry after heating generally takes place in that, due to a suitable movement program of the drum, which moreover can also have scooping devices for the aqueous liquid, the laundry is brought into contact with the aqueous liquid heated on Ti. Due to the temperature condition T _P1 <T _P2 i Ti, this procedure can be used, for example, to avoid burn-in of protein-containing contaminants. Preferably, T _{P1 is} in the range of 25 to 35 ° C.

Moreover, in a particularly gentle embodiment it is preferred that in step (b) T _P2 <Ti and, after reaching the temperature T _P2 while rotating the drum, rewetting the laundry with the aqueous liquid, and then the amount of water qi, optionally after filling the amount of aqueous liquid flowing back into the suds container to qi, to the temperature Ti is heated. The filling of the amount of water to qi after wetting of the laundry has been taken into consideration takes into account the fact that water is bound in the laundry due to the wetting process, which can not flow back into the tub.

If it is necessary to fill the amount of water to q-1, this additional amount of water, which is referred to simply as Aq, can be taken into account for the washing phase by making the subsets to be added if necessary in steps (c) and (d) lower so that the total q _to tai is preferably not exceeded.

In a particularly preferred embodiment of the method, the quantities qi, q ₂ and / or q _to tai are determined as a function of a loading amount of the drum and / or the type of laundry. For this purpose, in general in the control device of the washing machine, a relationship between the quantities q- ₁ , q ₂ and / or q _to tai as a function of a loading amount of the drum and / or the type of laundry deposited. Namely, if the wetting process and the washing phase are tuned to different sized items of laundry, it can be prevented that no very complete wetting takes place with very large items of laundry, but in comparison with small wetting items the wetting phase takes too long, measured by its wetting success. In addition, this achieves an improved uniformity of wetting.

Here, the loading amount of the drum with laundry can be automatically determined by a suitable determination method or manually adjusted by a user of the washing machine. Likewise, the type of laundry can be determined by a suitable method of determination, such as an optical method, or manually adjusted by a user of the washing machine.

In the method according to the invention, in step (a) and / or (b), in particular in step (b), the drum is preferably rotated at a higher rotational speed than in step (c).

Preferably, the drum in step (a) and / or (b), in particular in step (b), is rotated at an average rotational speed in the range of 40 to 60 revolutions / min and more preferably in the range of 45 to 55 revolutions / min.

Preferably, in step (c), the drum is rotated at an average rotational speed in the range of 25 to 45 rpm, more preferably in the range of 30 to 40 rpm, in particular in the range of 31 to 39 rpm.

In general, in the washing phase of step (d), the drum is rotated at an average rotational speed in the range of 40 to 60 rpm, and more preferably in the range of 45 to 55 rpm.

The invention also relates to a washing machine for treating laundry with a drum rotatably mounted in a tub, a drive motor for the drum, a control device, a water supply system, a measuring device for determining an amount of aqueous liquid introduced into the suds container, a heating device for heating the aqueous liquid in the suds container and a temperature sensor, wherein the control device is set up to carry out a method with the steps

(b) heating the amount q-ι of aqueous liquid to a predetermined temperature wherein q-ι the amount in one step or on several aliquots q-ι 'distributed can be filled and the heating to the temperature Ti after filling q-ι or can already begin after the addition of one or more subsets q-1 ', where qi and a first filled subset qT' are each greater than an amount q _{min which} is required to cover the heating device;

The temperature sensor used in this case is used in particular for controlling the heating such that the temperatures to be set can be adjusted. The washing machine according to the invention contains a measuring device for determining an amount of aqueous liquid introduced into the tub. Preferably, as a measuring device, a clock, a flow meter and / or a water level sensor available. For example, when using a clock, the time can be measured in which water flows through a water supply system. When the water pressure is known and constant, by measuring the time in which a valve is opened, the amount of aqueous liquid, particularly tap water, introduced into the tub can be well estimated.

More accurate measurement results are made possible by using a flow meter and / or a water level sensor. Since a water level sensor also takes into account that some of the aqueous liquid has possibly already been absorbed by the laundry, washing machines in which both a flow rate meter and a water level sensor are present are preferred according to the invention. Inventive washing machine and method according to the invention have numerous advantages. Thus, it is possible to carry out a washing process in a more energy-efficient manner by using an already heated aqueous liquid for wetting and preheating the laundry. It is sufficient to use a relatively small amount of the aqueous liquid and at least not a large amount generally required for a washing phase. The laundry may thus be preheated with a relatively warm aqueous liquid so that even with a later addition of colder water, in embodiments of the invention in one or more time-separated portions, it may be washed at a relatively high washing temperature. Finally, in the washing phase, the temperature of the laundry is a significant factor, since the interaction with a wash takes place here. Since heating of the water used for wetting happens relatively early according to the invention, in principle a faster running washing process can be realized. Overall, due to the small amount of water to be heated, the temperature required by a user and generally required for ensuring the washing effect can be achieved with significantly reduced energy input. For detergents without a bleach activator, eg IEC-B plus perborate as in the Australian or Saudi Arabian standard, a bleaching effect can be achieved with significantly reduced energy input.

In addition, a more uniform absorption of the detergent by the laundry can be supported if the detergent to be used is dissolved with a little very warm water before the laundry is saturated with water.

Finally, a hygiene effect can be achieved if the water warmed to Ti is dispersed in the laundry prior to the addition of further, colder water. For this Ti should be as high as possible. The invention will be explained in more detail below with reference to Figures 1 to 3. Fig. 1 shows a non-limiting embodiment of a washing machine according to the invention, in which a method according to the invention can be carried out.

FIG. 2 shows a diagram with a chronological overview of the sequence of a washing process according to the prior art.

3 shows a diagram with a time overview of the sequence of a washing method according to the present invention. Fig. 1 shows a non-limiting embodiment of a washing machine according to the invention, in which a method according to the invention can be carried out.

The washing machine contains a tub 1, in which a laundry drum 2 is rotatably mounted about a horizontal axis 3 and driven by a drive motor 14. By Wäschemitnehmer 4 and 5 Schöpfeinrichtungen for the wash liquor 6, an intensive flooding of the laundry 7 with wash liquor 6 and a reduction of not bound in the laundry 7 free liquor is achieved in particular in the direction of rotation of the arrow 16. The washing machine also has a liquor inlet system comprising a water connection fitting for the domestic water network 8, an electrically controllable valve 9 and a supply line 10 to the tub 1, which is guided here via a Waschmitteleinspüleinrichtung or Einspülschale 1 1, from the incoming water detergent portions in can transport the tub 1. The valve 9 may be controlled by a controller 12 in response to a program schedule that may be tied to a time schedule and / or the achievement of certain measurements of parameters (liquor level, caustic temperature, laundry drum speed, etc.) within the washing machine , Also located in the tub 1, a heater 13, which can also be switched by the controller 12. Finally, a temperature sensor 17 for measuring the temperature of the aqueous liquid 6 and a water level sensor 15, for example a pressure sensor, for measuring the amount of aqueous liquid 6 in the tub 1 are also present in the washing machine. In the supply line 10, a flow meter 18 is also present in the embodiment shown here. A washing program in this washing machine generally begins with the opening of valve 9, to lead water from the domestic water network 8 in the tub 1. A clock, not shown here can be used to determine a filled amount of water over the time required for this purpose.

In carrying out the method according to the invention in this washing machine, the steps

(A) filling a first amount q-ι of aqueous liquid 6 with a temperature T _q i in the tub 1;

(b) heating the amount qi of aqueous liquid 6 to a predetermined temperature Ti> T _q1 ;

(D) carrying out a washing phase with the laundry 7 in the presence of a detergent

carried out.

The qi quantity can be filled in one step or distributed over several subsets q.sup.-1, and the heating to the temperature T.sub.i _, monitored by means of the temperature sensor 17, can take place after the introduction of q.sup.-1 or after the addition of one or more subsets q.sup.-1 ', where qi and a first filled subset qT' are each greater than an amount q _min required to cover the heater 13. This ensures that the heating device 13 does not run dry and has to be switched off by a generally existing safety device.

19 means the water level at an amount q-ι, which is sufficient for immersing the laundry 7. 20 means the water level at an amount qi at which the drum 2 is being touched by the aqueous liquid 6. 21 is the amount required for covering the heater 13 at least q _min. 22 is the tub bottom.

Fig. 2 shows schematically for a conventional method, the temperature profile 23 and the water level profile 24 of an aqueous liquid in a tub during a conventional washing process, t means the time. In the conventional The method is filled in step (A) without heating water up to a maximum height H _max . Subsequently, in step (B) with interrupted water supply wetting of laundry instead, so that the water level goes back again. After wetting, the aqueous liquid is then heated in step (C) to the temperature T _max , which is the starting temperature for the washing phase (D). Since in the washing phase (D) is not heated further, the temperature drops slightly here.

Fig. 3 shows schematically for a method according to the invention, the temperature profile 25 and the water level profile 26 of an aqueous liquid in a tub during a washing process according to the invention, t in this case means the time. In the method according to the invention, in step (a) without heating, first a relatively small amount qi of an aqueous liquid is introduced. An aqueous liquid may in particular already contain a detergent. Subsequently, this amount qi is heated up to Ti in step (b). Depending on the extent to which a contact with laundry is present, the water level 26 can drop more or less. In step (c), a further addition of aqueous liquid then takes place when the heating is switched off, until in this embodiment the total amount of aqueous liquid to be used for the washing phase (d) is present. The temperature in the tub drops slightly.

LIST OF REFERENCE NUMBERS

1 tub

2 drum, laundry drum

3 rotation axis

4 laundry hamper

5 scooping devices

6 wash liquor; water

7 laundry

8 domestic water network

9 valve

10 supply line

1 1 dispenser tray

12 control device

13 heating device

14 drive motor

15 water level sensor

16 arrow for the direction of rotation of the drum; scooping direction

17 temperature sensor

18 Apparatus for determining an amount of aqueous liquid introduced into the tub; Flow Meter

19 water levels of a q-ι amount, which is sufficient for immersing the laundry

20 water level at an amount q-ι at which the drum is being touched by the aqueous liquid

21 to cover the heater minimum required amount q _min

22 lye container bottom

23 Temperature profile in the conventional method

24 Water level course in the conventional method

25 Temperature profile in the method according to the invention

26 Water level course in the process according to the invention

Claims

PATENT CLAIMS

Method for operating a washing machine for treating laundry (7) with a drum (2) rotatably mounted in a tub (1) and a drive motor (14) for the drum

(2), a control device (12), a water supply system (8,9, 10,1 1), a measuring device (15,18) for determining an amount of aqueous liquid (6) introduced into the tub (1), a heating device (13) for heating the aqueous liquid (6) in the tub (1) and a temperature sensor (17), characterized in that the steps

(a) filling a first amount qi of aqueous liquid (6) with a temperature T _q1 into the tub (1);

(b) heating the amount q-ι of aqueous liquid (6) to a predetermined temperature > T _q1 ;

whereby the amount q-ι can be filled in one step or distributed over several subsets q-ι' and the heating to the temperature Ti can begin after filling in qi or already after adding one or more subsets q-ι', where qi and a first filled subset qi" is in each case greater than an amount q _m in that is required to cover the heating device (13);

(c) adding a second quantity of water q ₂ with a temperature T _q2 < Ti to the heated quantity of water qi; and

(d) Carrying out a washing phase with the laundry (7) in the presence of a detergent

be performed.

Method according to claim 1, characterized in that the quantity qi is determined depending on a usable energy E _max specified for the method and the specified temperature Ti, a relationship between E _max , Ti and qi being stored in the control device (12). .

3. The method according to claim 1 or 2, characterized in that the amount qi of the aqueous liquid (6) is heated to the predetermined temperature T-i in one step.

4. The method according to claim 1 or 2, characterized in that depending on an energy E _heating that can be used for heating q-ι in step (b), which is smaller than a maximum energy E _max that can be used for the method, and the predetermined temperature Ti, the subsets q-ι' are determined, after which they are filled into the tub (1) and are heated, with a connection between E _heating , Ti and the subsets q-ι' being stored in the control device (12). .

5. The method according to any one of claims 1 to 4, characterized in that a total amount q _to tai = qi + Σ q _n of aqueous liquid is used to carry out the washing phase in step (d), the q _n in step (c ) and (d) added portions of aqueous liquid (6) with a respective temperature T _qn <Ti, where n > 2.

6. The method according to claim 5, characterized in that in the event that the quotient qi / q _to tai falls below a predetermined value x, in the washing phase of step (d) the quantities q _n with n > 3 according to one of the quotient qi /q _to tai dependent schedule.

7. The method according to any one of claims 1 to 6, characterized in that the detergent for the washing phase (d) is contained in q-ι and / or q ₂ .

8. The method according to one of claims 1 to 7, characterized in that depending on the ratio q / q _2, the amount of water q ₂ is selected so that the temperature of the amount of water qi +q ₂ does not fall below a predetermined minimum value T _W ash for the temperature of the aqueous liquid (6) falls.

9. The method according to one of claims 1 to 8, characterized in that the amount of water qi in step (b) is first heated to a temperature T _P1 <Ti and after wetting the laundry (7) and filling it up if necessary the amount of water in the tub (1) is heated to qi, the aqueous liquid (6) in the tub (1) is heated to a temperature T _P2 , where T _P1 <T _P2 i Ti applies.

Method according to claim 9, characterized in that T _P1 is in the range of 25 to 35°C.

Method according to claim 9 or 10, characterized in that in step (b) T _P2 < Ti and after reaching the temperature T _P2 while rotating the drum (2), the laundry (7) is wetted again with the aqueous liquid (6) is carried out, and then the amount of water qi is heated to the temperature Ti, if necessary after filling the amount of aqueous liquid (6) flowing back into the tub (1) to qi.

Method according to one of claims 1 to 1 1, characterized in that the quantities q-ι, q ₂ and/or q _to tai are determined depending on a load quantity of the drum (2) and/or the type of laundry (7). .

Washing machine for treating laundry (7) with a drum (2) rotatably mounted in a tub (1), a drive motor (14) for the drum (2), a control device (12), a water supply system (8, 9, 10, 1 1), a measuring device (15,18) for determining an amount of aqueous liquid (6) introduced into the tub (1), a heating device (13) for heating the aqueous liquid (6) in the tub (1) and a Temperature sensor (17), characterized in that the control device (12) is set up to carry out a method with the steps

(a) filling a first quantity q-ι of aqueous liquid (6) with a temperature T _q1 into the tub (1);

(b) heating the amount qi of aqueous liquid (6) to a predetermined temperature Ti > T _q1 ;

whereby the amount qi can be filled in in one step or distributed over several subsets q-ι' and heating to the temperature Ti begins after filling in qi or already after adding one or more subsets q-ι' can, where qi and a first filled subset qi" are each greater than an amount q _m in that is required to cover the heating device (13);

(d) Carrying out a washing phase with the laundry (7) in the presence of a detergent.

Washing machine according to claim 13, characterized in that a clock, a flow meter (18) and/or a water level sensor (15) is present as the measuring device (15, 18).