BE1031021B1 - Method for operating a washing machine and washing machine - Google Patents

Abstract

The present invention relates to a method for operating a washing machine (1), the washing machine (1) comprising a suds container (2), a washing drum (4), a drum drive, a circulation pump (5) for conveying liquid in the suds container (2) to textiles (6) located in the washing drum (4), at least one fill level sensor (8) for detecting information relating to a fill level of the suds container (2) with liquid and a control device (9).

Description

Description

Method for operating a washing machine and washing machine

The invention relates to a method for operating a washing machine according to claim 1. Furthermore, the present application relates to a washing machine for washing textiles according to claim 12.

The washing machine comprises a tub in which a washing drum is mounted so that it can rotate. The washing machine also has a drum drive, by means of which the

Washing drum can be rotated around its axis of rotation. The washing machine also comprises a

Circulation pump, by means of which the liquid in the lye tank is pumped into the

The circulation pump is designed in such a way that the liquid can be conveyed to textiles that are in the washing drum. For this purpose, the circulation pump can cooperate in particular with a liquid line, by means of which the liquid conveyed by the circulation pump is conveyed to an upper end of the

washing drum, so that when the circulation pump is operating, the liquid, which is typically taken from near the bottom of the tub or from the bottom of the tub, can be directed from above onto the textiles in the washing drum. The washing machine also comprises at least one level sensor. This is suitable for

Information regarding the filling level of the suds container with liquid. In order to process this information, the washing machine also has a control device that is connected to the filling level sensor in a data-transmitting manner, so that the recorded

Information can be transmitted to the control device and processed by it.

In the prior art, it is already known to determine a saturation state of the textiles in the washing drum. This is important for a water supply control, by means of which it is to be automatically controlled how much water is to be introduced into the tub for a particular wash cycle. In order to determine the saturation state of the textiles, it is first necessary to determine a volume flow that is to be

can be or is expelled from the textiles during the expulsion period.

To determine this volume flow, it is known to activate the circulation pump and at the same time increase the speed of the washing drum until a

The pressure sensor installed in the tub sets a predefined pressure level. This

This process usually involves raising the ejection speed of the washing drum to a very high level, which is associated with high mechanical

This is accompanied by a high load on the components of the washing machine and high noise emissions. Raising the expulsion speed to a high level is necessary to expel enough water from the textiles so that a

Pressure increase can be reliably measured. If water is to be expelled at a lower speed instead, the volume flow cannot always be reliably determined.

This is especially true if the washing drum is loaded with relatively little laundry, for example 1 kg or 2 kg.

The present application is based on the task of determining the volume flow of

To be able to more reliably determine the amount of liquid expelled from textiles.

The underlying object is achieved according to the invention by means of the method with the

Features of claim 1. Advantageous embodiments result from the

Associated subclaims.

The method according to the invention is carried out as follows: The

Washing drum is driven to rotate around its axis of rotation. This can be done in such a way that the washing drum has a constant base speed. At the same time, the

Circulation pump is operated so that liquid in the tub is pumped onto the ı5 textiles. This operating state is maintained until the

The filling level of the lye container reaches a previously defined value. The monitoring of the

The fill level is determined by means of the fill level sensor, which records the relevant information.

Preferably, the information is continuously recorded using the fill level sensor. In this context, “continuously” means recording the information at a specific sampling frequency. The latter is advantageously at least 50 Hz, preferably at least 100 Hz.

After the filling level of the suds container has reached the defined value, the

Circulation pump switched off. The defined value that leads to this break can be, for example, 0 mm water column. In this scenario, the circulation pump is only switched off after all the liquid in the tub has been pumped onto the textiles by the circulation pump, so that in the

There is no more liquid in the tub. It can be assumed that due to the

The rotating drive of the washing drum causes liquid to leak from the textiles into the tub. However, this liquid is immediately returned to the

Textiles. Alternatively, it is also conceivable that the defined value of the filling level, after which the circulation pump is switched off, corresponds to a filling of the

tank with a certain volume of liquid, different from zero. The washing drum is kept at its original position until the circulation pump is switched off.

Base speed rotationally driven.

The switching off of the circulation pump “after reaching the defined value” can be

In the sense of the present application, on the one hand, this means an immediate shutdown at the moment the defined value is reached. On the other hand, it is conceivable that the

The circulation pump is only switched off after a certain waiting period after the defined value has been reached, for example after a few seconds. It is therefore conceivable that the filling level of the lye container does not reach the defined value, for example 0 mm

water column, and the circulation pump is not switched off until five seconds after this point in time.

In any case, the washing drum continues to rotate, whereby the liquid expelled from the textiles gradually collects in the tub due to the circulation pump no longer being active. In order to reduce the volume flow of the liquid expelled from the textiles,

liquid (especially when the washing drum is lightly loaded) and to

To improve the measurability of the volume flow, the speed of the

After the circulation pump has been switched off, the washing drum is increased from the basic speed to a ı5 higher expulsion speed. The washing drum can therefore be switched off for a defined expulsion period, for example, during which the

The volume flow is to be determined by rotating the output speed.

For example, the base speed can be 400 rpm and the increased

Expulsion speed should be 500 rpm.

While the washing drum is rotated in the manner described, information regarding the fill level of the detergent solution container is recorded by means of the fill level sensor.

This information is sent to the control device and processed by it.

The volume flow of the expelled liquid is then determined. For this purpose, the

Information from the filling level sensor is processed, whereby, for example, a respective filling level of the lye container can correspond to a known volume of expelled liquid. The connection between the filling level and the volume of expelled liquid that is in the lye container when the filling level is present is given by a geometry of the lye container. Since this geometry is known, the volume of expelled liquid can be determined directly from a respectively recorded

It is conceivable that the volume of the expelled liquid can be represented as a function of the filling level of the lye container with liquid. Furthermore, it is conceivable that at least one defined filling level, which is determined by means of at least one

level sensor, the volume of the liquid present in the tub

Liquid is known. Preferably, the information that a certain volume of liquid is present in the tub at a defined filling level is known at several different filling levels, the different filling levels being determined by means of different

Level sensors or a single level sensor can be used to detect the volume of liquid expelled. The volume of liquid expelled corresponds to the difference between the

Volumes of liquid in the suds container that were present at the two filling levels.

With the known volume of the expelled liquid, it is possible to determine the

To determine the volume flow, it is still necessary to divide the volume by the duration of an expulsion period over which the volume was expelled from the textiles. The result describes a volume flow, for example in the dimension liters per minute [I/m], which was expelled from the textiles on average during the expulsion period.

The method according to the invention has many advantages. In particular, it is not, as in the prior art,

Technology requires the rotation speed of the washing drum to be increased to a very high level for a longer period of time (in the current state of the art, over 1000 rpm are regularly required). Instead, the volume flow of the expelled liquid can generally be determined with a much lower base rotation speed of the washing drum, for example 350

U/min. The invention also provides for the case that only a comparatively small volume flow emerges from the textiles at the base speed. This can be the case in particular if the washing drum is only filled with a small amount of

textiles, for example with 1 kg or 2 kg. In this case, as described, the

The speed of the washing drum is increased - preferably temporarily - to the expulsion speed, so that the volume flow is increased. The relationship here is that the higher the speed of the washing drum, the greater the discharge of

Liquid from the textiles, which leads to a larger volume flow.

The ejection speed is preferably still well below the values that are usual in the state of the art, so that the mechanical load on the components of the

Washing machines are reduced, as are the noise emissions of the washing machine in the

During the implementation of the process. If necessary, the ejection speed can also be well beyond 1000 rpm, for example 1600 rpm.

In a particularly preferred embodiment, the expulsion period extends between two

Points in time at which it is known what volume of liquid the

The first point in time can be the time of

Switching off the circulation pump, to which, according to the above explanation, the

The filling level of the lye container can be 0 mm water column, for example. The second

In particular, a point in time can be selected at which a specific filling level of the lye container, which is different from zero, is detected by means of the at least one filling level sensor. In this embodiment, the volume that is

expelled from the textiles during the expulsion period, the volume resulting from the fill level detected by the fill level sensor at the second time point.

The duration of the expulsion period advantageously corresponds to the time difference between the two times mentioned. This means that all values for the division of the volume by the duration of the expulsion period described above are known, so that the average volume flow of the expelled liquid can be determined. 5 According to the above explanation, it is accordingly advantageous if the times that define a start and an end of the expulsion period are those at which the

The level of the suds container with liquid has reached a previously defined value. This

This approach has the advantage that it is particularly easy to determine the

The volume of the liquid expelled can be determined because the filling levels, the values of which are determined, can be linked to the volume of liquid in the lye container. This can be done in particular by filling the lye container with

Liquid is filled to a respective level, whereupon the volume of the

The volume of liquid introduced into the lye container is measured (“calibration”). This can of course also be determined digitally using appropriate design models. ı5 Accordingly, it can be particularly advantageous if the volume of liquid expelled over the duration of the expulsion period is determined using fill levels that existed at the times between which the expulsion period extends. The fill levels correspond to a filling of the lye container with a certain volume of liquid. The advantages resulting from this have already been explained above.

It is also conceivable that the fill levels are not determined in advance, the reaching of which defines the expulsion period, but the expulsion period is determined conversely, i.e. the two points in time that define the beginning and end of the expulsion period. At these defined points in time, the at least one fill level sensor is used to determine the

The filling level of the lye container with liquid is determined, whereby the filling levels are each marked with a

volume of liquid that is at each point in time in the

The volume of the expelled lye in the expelling period

The volume of liquid is determined by the difference between the volumes of liquid at the beginning and at the end of the expulsion period. The duration of the expulsion period is also known (temporal

Difference between the beginning and end of the expulsion period), so that all values for the

Determination of the average volume flow.

Preferably, both the beginning and the end of the expulsion period are selected such that the washing drum is rotated at the expulsion speed during the entire expulsion period. In this way, the volume flow of the liquid that comes out of the

Textiles, as large as possible and therefore easy to measure.

In a particularly advantageous embodiment of the method, the same comprises a

Preparatory stage which, in the structure of claim 1, is carried out chronologically before the first-mentioned method step a). The steps mentioned in claim 1

Process steps can be considered in the sense of the present application as a measuring section of the

procedure, whereby - if applicable - the preparation phase is carried out before the measurement phase.

In the preparation section, the speed of the washing drum can be increased to the base speed before the circulation pump is switched on.

Washing drum gradually accelerates from a starting value, for example 300 rpm, whereby liquid is drawn out of the

Textiles are expelled and collects in the suds container.

Preferably, the speed is increased until a previously defined value of the filling level of the suds container is detected by the filling level sensor. As soon as this value is reached, the speed of the washing drum is no longer increased. The ı5 speed then reached forms the "base speed" of the process. The circulation pump is then activated so that the measuring section of the process can begin.

Furthermore, it can be particularly advantageous if a mass of all the textiles in the washing drum is determined. This can be done in particular by means of a

The mass of the textiles is preferably determined while they are in a dry state. The parameter of the mass of the

Textiles, preferably in a dry state, can also be used as

Input parameters can be used for further evaluations.

If the mass is determined, it can be particularly advantageous if the expulsion speed is automatically selected by the control device depending on the mass of all the textiles in the washing drum. As already indicated, the application of the method is particularly useful when there is only a small mass of textiles in the washing drum. The extent to which the speed of the washing drum should be increased from the base speed, i.e. the amount by which the expulsion speed should be, is preferably made dependent on the mass of textiles present. The rule here is that the lower the mass, the higher the expulsion speed. By increasing the mass of the

Textiles is measured by means of automatic selection of the expulsion speed, for example according to a previously defined function between the mass of textiles and

Ejection speed, particularly useful so that the washing machine can be operated optimally regardless of the user.

It can also be particularly advantageous to reduce the amount of water introduced into the suds container

liquid, preferably using an inlet sensor. Such a

The sensor can be formed, for example, by a vane meter, by means of which a

Volume of liquid introduced into the tub is recorded. This tells us how much liquid is in the tub in total, while the

procedure is carried out.

If the amount of liquid introduced into the tub is determined, it can be particularly advantageous if the expulsion speed is automatically selected by the control device depending on the amount of liquid. This procedure follows the consideration that if a small amount of liquid is introduced into the tub, the volume flow of liquid expelled from the textiles will probably also be small and will therefore be more difficult to measure. The extent to which the speed of the washing drum should be increased from the base speed, i.e. the amount by which the expulsion speed should be, is therefore preferably made dependent on the amount of liquid present. The rule here is that the smaller the amount, the greater the expulsion speed. By increasing the

The amount of liquid is measured, the automatic selection of the

Expulsion speed, for example according to a previously defined function between the amount of

Fluid and ejection speed are particularly useful so that the washing machine can be operated optimally regardless of the user.

If both the mass of the textiles and the amount of liquid introduced are determined, it is also particularly advantageous if the expulsion speed is determined by means of the

Control device is automatically determined depending on both the amount of liquid introduced into the tub and the mass of all the textiles in the washing drum. This means that the expulsion speed is automatically determined individually for each individual case, so that the average volume flow can be determined particularly reliably. The function of the expulsion speed depending on the mass of the textiles and the amount of liquid can be determined in advance using empirical studies.

The underlying object is further achieved by means of a washing machine with the features of claim 12. Advantageous embodiments result from the associated

subclaims.

The control device of the washing machine according to the invention is designed and configured to control the drum drive and the circulation pump depending on the

The washing machine is therefore particularly well suited to carrying out the method according to the invention. The advantages resulting from this have already been explained above. In particular, a volume flow of over the duration of an expulsion period from the liquids in the washing drum can be

The liquid expelled from textiles can be determined particularly reliably, even when the mass of textiles in the washing drum is comparatively small.

The washing machine is particularly advantageous if it has at least one

Inlet sensor for detecting information regarding a quantity of liquid introduced into the suds container. The inlet sensor can be designed in particular to determine a volume of all liquid introduced into the suds container. For this purpose, the inlet sensor can be formed by an impeller counter, for example.

Furthermore, such a washing machine can be advantageous in which at least one

Level sensor is formed by a pressure sensor or a contact sensor. In particular, when the level sensor is designed as a pressure sensor, it can preferably be a

Bottom of the tub, that is, in particular in the bottom of the

In this way, the level sensor can be used to create a hydraulic

Pressure of liquid in the tub can be determined, which indicates a

The filling level of the lye container measured from the floor can be determined. Accordingly, the filling level of the lye container can be determined particularly well with such a filling level sensor. Knowing the geometry of the lye container, this

Information can also be used to determine the volume of liquid that is in the

Lye container is present.

If the level sensor is a contact sensor, it is advantageous if this

Is arranged at a vertically measured distance from the bottom of the tub. In this embodiment, the information from the level sensor can be interpreted in such a way that at the moment the level sensor comes into contact with liquid, the

A lye container filled with a certain volume of liquid, which is connected to a

Distance of the level sensor from the bottom of the tub corresponds to the filling level of the tub with liquid. Knowing a geometry of the

In this way, the volume of the solution contained in the lye container is

liquid known.

Furthermore, it can be particularly advantageous if the washing machine has a plurality of

level sensors located at different distances from the bottom of the

In this way, at different times during the expulsion of liquid from the textiles in the washing drum, the volumes of liquid that are in the

In this embodiment, the times can be defined in particular by the fact that the level sensors are in contact with the

Liquid has entered the system. From this it can be concluded that the

The lye container at each of these times is or was filled with a volume of liquid that corresponds to a filling level of the lye container that corresponds to the distance of the respective filling level sensor from the bottom of the lye container. The times at which the filling level sensors come into contact with the liquid are particularly well suited to defining the beginning and end of the expulsion period, while the 11 volumes that correspond to the recorded filling levels are particularly well suited to

Volume that was expelled from the textiles during the expulsion period. In this design, the level sensors are preferably

Contact sensors are formed.

An embodiment of the invention is shown purely schematically in the drawings and

Is described in more detail below. It shows:

Figure 1 A schematic representation of a washing machine according to the invention,

Figure 2 A speed curve of a washing drum during operation of the

Washing machines as shown in Figure 1.

An embodiment illustrated in Figures 1 and 2 comprises a

Washing machine 1, which comprises a tub 2 and a washing drum 4 that can be driven in rotation within the tub 2. The washing drum 4 is mounted so that it can be driven in rotation about a rotation axis 3, wherein the washing drum 4 is driven in rotation by means of a

drum drive can be driven in rotation. Textiles 6 which are to be washed by means of the washing machine 1 are stored in the washing drum 4.

Furthermore, the washing machine 1 comprises a circulation pump 5, which is provided and designed to direct liquid in the tub 2 to the textiles 6 located in the washing drum 4. For this purpose, the circulation pump 5 acts with a

Liquid line 7, which leads the circulated liquid to an upper end of the

Washing drum 4 so that the circulated liquid can fall from above onto the textiles 6. For this purpose, a nozzle (not shown in the figure) can be arranged at an end of the liquid line 7 facing away from the circulation pump 5. The suction of the liquid from the tub 2 by means of the circulation pump 5 takes place in the area of the bottom 13 of the tub 2 so that the circulation pump 5 can draw all the liquid in the

The liquid contained in the suds container 2 can be removed from the suds container 2.

Furthermore, the washing machine 1 comprises a supply line 14, by means of which liquid can be introduced into the tub 2 from a liquid supply not shown in the figure, wherein in order to convey the liquid into the tub 2 in the example shown, a

Pump 15 is provided. In the example shown, an inlet sensor is arranged in the supply line 14, which here is formed by a vane meter. The inlet sensor 10 is therefore suitable for providing information regarding a volume of water introduced into the suds container 2.

to capture liquid.

Furthermore, the washing machine 1 comprises a level sensor 8. This is attached to the bottom 13 of the

The level sensor 8 is formed here by a pressure sensor 10 which is provided and set up to continuously record information relating to a hydraulic pressure present on a sensor surface, which acts on the pressure sensor in the form of a water column. From the recorded hydraulic

Pressure immediately results in a height of a liquid level of the liquid within the

Lye container 2, where the liquid is located at any given time. In other words, this gives the fill level of the lye container 2.

This information is sent to a control device 9 of the washing machine 1, so that the control device 9 can use the information recorded by the fill level sensor 8 to control the operation of the washing machine 1. In the example shown, the control device 9 is also connected to the inlet sensor 10 in a data-transmitting manner, so that the information recorded by the inlet sensor 10 is sent to the

Control device 9 and can also be processed by means of this.

When carrying out the method according to the invention, first of all, before initiating

Liquid in the tub 2 by means of a mass inertia process a mass of all

Textiles 6 that are in the dry state in the washing drum 4. In the example shown, the washing drum is loaded with 2.0 kg of laundry. Then, using the

Pump 15 lets liquid through the supply line 14 into the tub 2. The volume of the total liquid introduced is recorded by the inlet sensor 10. In the

Furthermore, the washing drum 4 is rotated about its axis of rotation 3 by means of the drum drive and at the same time the circulation pump 5 is operated in order to

Liquid into the textiles 6. Then, in a preparation section of the

The circulation pump 5 is initially deactivated so that, as a result of a further

The rotary drive of the washing drum 4 causes liquid to be expelled from the textiles 6 and collects in the tub 2. To determine a base speed 11 for the washing drum 4, the speed of the washing drum 4 is gradually increased, for example with a

Acceleration of 20 rpm per second. This is particularly well illustrated in Figure 2 by a

Speed curve 16 can be seen, which in a coordinate system shows the time in seconds plotted on its x-axis 17 with revolutions of the

washing drum 4 per minute. The filling level of the tub 2 is continuously recorded by means of the filling level sensor 8. As soon as the filling level reaches a defined

value that was set beforehand is reached, the speed of the washing drum 4 is no longer increased. The speed level reached from then on forms the base speed 11. The

Circulation pump 5 is reactivated, completing the preparation phase of the procedure.

This is followed by a measuring section of the procedure. In this measuring section, the

Washing drum 4 initially continues to rotate at its previously determined base speed 11.

By means of the circulation pump 5, the liquid in the tub 2 is directed via the liquid line 7 to the textiles 6 in the washing drum 4. This

In the example shown, the process is maintained until the

The filling level sensor 8 detects that the filling level of the suds container 2 is 0 mm water column. In other words, at this point in time, all the liquid in the ı5 suds container 2 has been introduced into the textiles 6. After a waiting period of five seconds, the circulation pump 5 is then deactivated, while the washing drum 4 continues to operate at the base speed 11. The speed of the washing drum 4 is then accelerated from the base speed 11 to a previously defined expulsion speed 12.

As a result of the continuous rotation of the washing drum 4 with the increased expulsion speed 12, liquid is expelled from the textiles 6, which then collects in the tub 2. Due to the comparatively high expulsion speed of 400 rpm, the volume flow of the expelled liquid is of such a magnitude that a change in the

The filling level can be easily detected using the filling level sensor 8. Since the filling level of the

of the lye container 2 is continuously recorded, here with a frequency of 200 Hz,

Information regarding a change in the filling level over time. At a defined point in time after switching off the circulation pump 5, for example after 20

seconds, the fill level of the solution container 2 at that time is recorded.

To determine the average volume flow, a corresponding volume of the liquid that is or was in the lye container 2 at that time is determined for the fill level that existed at the defined time. The value of this

The volume corresponding to the filling level of the lye container 2 can be known in particular from a previous determination. Since at the time of switching off the

Circulation pump 5 the filling level of the lye container 2 was zero, the volume determined at the defined time corresponds to the volume that has been

Circulation pump 5 was expelled from the textiles 6. The corresponding

Points in time, i.e. the point in time when the circulation pump 5 is switched off on the one hand and the defined point in time 20 seconds after the circulation pump 5 is switched off on the other hand, mark the beginning and the end of an expulsion period over the duration of which the determined volume was expelled from the textiles 6. This duration of the expulsion period s is 20 seconds here. By dividing the determined volume by the

The average volume flow is finally determined based on the duration of the expulsion period.

In the example shown, the ejection speed 12 is automatically set by means of the control device 9, whereby the selection of the ejection speed 12 depends on both the

Volume or the amount of liquid introduced into the tub 2, which is

inlet sensor 10, as well as the mass of the laundry in the washing drum 4.

Textiles 6. The selection of the expulsion speed 12 is based on empirical

Models stored on the control device 9.

List of reference symbols 1 Washing machine 2 Tub 3 Rotary axis 4 Washing drum 5 Circulation pump 6 Textiles 7 Liquid line 8 Level sensor 0 9 Control device

Inlet sensor 11 Base speed 12 Expulsion speed 13 Bottom 14 Supply line 15 Pump 16 Speed curve 17 x-axis 18 y-axis

Claims (14)

Expectations 1. Method for operating a washing machine (1), the washing machine (1) comprising - a suds container (2), - a washing drum (4) arranged in the suds container (2) and drivable in rotation about an axis of rotation (3), - a drum drive for driving the washing drum (4) in rotation about its axis of rotation (3), - a circulation pump (5) for conveying liquid in the suds container (2) to textiles (6) located in the washing drum (4), - at least one fill level sensor (8) for detecting information relating to a fill level of the suds container (2) with liquid, - a control device (9), the method comprising the following method steps: a) the washing drum (4) is driven in rotation about its axis of rotation (3) at a base speed (11); b) The circulation pump (5) is operated to pump liquid in the suds container (2) onto the textiles (6) until the information detected by the fill level sensor (8) shows that the fill level of the suds container (2) has reached a previously defined value; Cc) After the fill level has reached the defined value, the circulation pump (5) is switched off; d) The washing drum (4) continues to rotate, whereby liquid is expelled from the textiles (8) and collects in the suds container (2), the speed of the washing drum (4) being increased from the base speed (11) to an expulsion speed (12); e) Information relating to the fill level of the suds container (2) is detected by means of the fill level sensor (8) and passed to the control device (9); f) The information is processed by means of the control device (9) in such a way that a volume of expelled liquid determined on the basis of at least one fill level is divided by a duration of an expulsion period, whereby a volume flow of the expelled liquid averaged over the expulsion period is determined. 2. Method according to claim 1, characterized in that the filling level at which the circulation pump (5) is switched off is 0 mm water column. 3 Method according to claim 1 or 2, characterized in that the expulsion period begins simultaneously with the switching off of the circulation pump (5) or after the switching off of the circulation pump (5). 4. Method according to claim 3, characterized in that the washing drum (4) is operated at the expulsion speed (12) at least during a part of the expulsion period, preferably during the entire expulsion period. 5. Method according to one of the preceding claims, characterized by a preparation section in which the speed of the washing drum (4) is gradually increased to the base speed (11) with the circulation pump (5) switched off. 6. Method according to claim 5, characterized in that the speed of the washing drum (4) at which the filling level of the suds container (2) reaches a previously defined value is defined as the base speed (11), wherein the increase in the speed is preferably terminated at the moment the value is reached, so that the speed of the washing drum (4) remains at least temporarily at the level of the base speed (11). 7. Method according to one of the preceding claims, characterized in that a mass of all textiles (6) located in the washing drum (4) is determined, in particular by means of a mass inertia method, wherein preferably the mass of the textiles (6) is determined while they are in a dry state. 8. Method according to claim 7, characterized in that the expulsion speed (12) is automatically selected by means of the control device (9) depending on the mass of all textiles in the washing drum (4). 9. Method according to one of the preceding claims, characterized in that a quantity of the liquid introduced into the lye container (2) is detected, in particular by means of an inlet sensor (10). 10. Method according to claim 9, characterized in that the expulsion speed (12) is automatically selected by means of the control device (9) depending on the amount of liquid introduced into the suds container (2). 11. Method according to claims 8 and 10, characterized in that the expulsion speed (12) is automatically selected by means of the control device (9) depending on both the mass of all textiles in the washing drum (4) and the amount of liquid introduced into the tub (2). 12. Automatic washing machine (1) for washing textiles (6), comprising - a suds container (2), - a washing drum (4) arranged in the suds container (2) and rotatably driven about a rotation axis (3), - a drum drive for rotating the washing drum (4) about its rotation axis (3), - a circulation pump (5) for conveying liquid in the suds container (2) to textiles (6) in the washing drum (4), - at least one fill level sensor (8) for detecting information relating to a fill level of the suds container (2) with liquid, - a control device (9), wherein the control device (9) is connected to the fill level sensor (8) in a data-transmitting manner, wherein the control device (9) is provided and set up to operate the drum drive and the circulation pump (5) depending on the information detected by the fill level sensor (8) as follows: a) The washing drum (4) is rotated at a base speed (11) about its rotation axis (3) rotationally driven; b) The circulation pump (5) is operated to pump liquid in the suds container (2) onto the textiles (6) until the information detected by the level sensor (8) shows that the level of the suds container (2) has reached a previously defined value; Cc) After the level has reached the defined value, the circulation pump (5) is switched off; d) The washing drum (4) is further rotated, whereby liquid is expelled from the textiles (8) and collects in the suds container (2), the speed of the washing drum (4) being increased from the base speed (11) to an expulsion speed (12); e) Information relating to the fill level of the suds container (2) is detected by means of the fill level sensor (8) and passed to the control device (9); f) The information is processed by means of the control device (9) in such a way that a volume of expelled liquid determined on the basis of at least one fill level is divided by a duration of an expulsion period, whereby a volume flow of the expelled liquid averaged over the expulsion period is determined. 13. Washing machine (1) according to claim 12, characterized by at least one inlet sensor (10) for detecting information relating to an amount of liquid introduced into the tub (2). 14. Washing machine (1) according to claim 12 or 13, characterized in that the fill level sensor (8) is designed as a pressure sensor, wherein the fill level sensor (8) is preferably arranged in a bottom region of a bottom (13) of the tub (2).