EP3739100B1 - Laundry care appliance with a control of the washing liquid supply device and corresponding method for the care of laundry - Google Patents

Description

The present invention relates to a laundry care appliance with a controller.

In a conventional laundry care appliance, the absorbency of the laundry placed in the laundry drum is normally not known to a controller of the laundry care appliance. In this case, in order to ensure effective laundry care of the laundry to be cared for, the laundry is usually washed in an oversaturated condition, so that the laundry is supplied with a larger quantity of washing liquid than the quantity of washing liquid which would be required for effective laundry care. Thus, due to the oversaturation of the laundry with washing liquid, the consumption of the laundry care substance increases and an increased amount of heating energy has to be used to heat up the larger amount of washing liquid.

In the DE 10 2016 212 490 A1 discloses a laundry care appliance with a controller.

In the EP 2 348 151 A1 discloses a process for using laundry in a program-controlled washing machine.

In the EP 2 752 514 A1 a front loading washing machine with control of a circulation pump is disclosed.

It is the object on which the invention is based to specify a laundry care appliance in which an advantageous saturation of the laundry with washing liquid is ensured during a laundry care process.

This object is solved by the objects with the features according to the independent claims. Advantageous embodiments are the subject matter of the dependent claims, the description and the drawings.

According to a first aspect, the object of the invention is achieved by a laundry care appliance with a tub for holding washing liquid, the tub having a drain opening and an inlet opening, which through a liquid line are fluidically connected, a laundry drum for receiving laundry, a washing liquid supply device for supplying washing liquid into the tub, a pump which is designed Washing liquid to be pumped out through the drain opening into the liquid line and the pumped-out washing liquid to be fed back to the tub through the inlet opening in order to wet the laundry in the laundry drum, a volume detection device for detecting a volume of washing liquid not bound to the laundry, and a controller for controlling the pump and the washing liquid supply device, wherein the laundry care appliance has a textile detection device for detecting a textile type of the laundry accommodated in the laundry drum and/or a weight detection device for detecting a weight of the laundry accommodated in the laundry drum, wherein the controller is designed to supply a washing liquid supply device to the tub determine the amount of washing liquid based on a detected textile type of the laundry and/or based on a recorded weight of the laundry, the controller being designed to activate the washing liquid supply device for a period of time, and to supply the specific amount of washing liquid to the tub, the controller being designed to activate the pump during the period of time in order to circulate the supplied washing liquid through the liquid line, wherein the volume detection device is designed to detect a volume of the washing liquid that is not bound to the laundry, and wherein the controller is designed to deactivate the washing liquid delivery device if the detected volume exceeds a volume reference value, the volume reference value being determined as a function of the detected textile type and/or the detected weight of the laundry and the volume reference value being determined as a function of a desired saturation of the laundry.

This achieves the technical advantage that a desired, optimal saturation value of the laundry can be achieved by comparing the detected volume with the volume reference value. Thus, oversaturation of the laundry with washing liquid is avoided and detergent consumption and heating energy consumption can be limited.

In order to determine the amount of washing liquid supplied to the tub in a particularly advantageous manner, the amount of washing liquid to be supplied is determined by the controller on the basis of the detected textile type of the laundry and/or on the basis of the detected weight of the laundry.

In particular, the amount of washing liquid to be supplied is determined on the basis of the textile type of the laundry detected by the textile detection device. In particular, the amount of washing liquid to be supplied is determined based on the weight of the laundry detected by the weight detection device. In particular, the amount of washing liquid to be supplied is determined on the basis of the textile type of the laundry detected by the textile detection device and on the basis of the weight of the laundry detected by the weight detection device.

Depending on the required accuracy of determining the amount of washing liquid to be supplied, the laundry care appliance can have only one textile detection device, only one weight detection device or one textile detection device and one weight detection device in order to carry out the corresponding determination.

The deactivation of the washing liquid supply device, which correlates with the end of the supply of washing liquid, is subject to the condition that the volume of the washing liquid not bound to the laundry exceeds a volume reference value. The volume reference value is determined as a function of the textile type of the laundry detected by the textile detection device and/or as a function of the weight of the laundry detected by the weight detection device.

In this case, the volume reference value can be determined in particular as a function of the textile type of the laundry detected by the textile detection device. In particular, the volume reference value can be determined in particular as a function of the weight of the laundry detected by the weight detection device. In particular, the volume reference value can be determined as a function of the textile type of the laundry detected by the textile detection device and as a function of the weight of the laundry detected by the weight detection device.

By supplying the specified amount of washing liquid to the laundry, the laundry is advantageously saturated with washing liquid. A part of the supplied amount of washing liquid is not bound by the laundry and flows out into the tub and can be detected by the volume detection device.

A correlation can thus be obtained between the saturation of the laundry and the volume of the washing liquid not bound to the laundry. If the detected volume exceeds the volume reference value, the desired saturation of the laundry has been reached and the washing liquid supply device is deactivated.

The volume reference value is also determined as a function of the desired saturation, in particular 10%, 25%, 50%, 75% or 100% saturation of the laundry. If, for example, only 50% saturation of the laundry is desired, the volume reference value can be halved, for example.

By precisely setting the saturation of the laundry to be cared for with washing liquid, a resource-saving and energy-reduced washing process can be ensured and, moreover, an optimal washing effect due to optimal wetting of the laundry can be made possible.

A laundry care device is understood to mean a device that is used for laundry care, such as a washing machine or a tumble dryer. In particular, such a laundry care appliance is understood to mean a household laundry care appliance. In other words, a laundry care device that is used as part of housekeeping and is used to treat laundry in normal household quantities.

In an advantageous embodiment of the laundry care appliance, the controller is designed, if the detected volume falls below the volume reference value, to repeat the period of time in order to determine a new quantity of washing liquid, to again supply the determined quantity of washing liquid to the tub, to again supply a volume of washing liquid that is not bound to the laundry detect, and to deactivate the washing liquid supply device when the sum of the volume and the re-detected volume exceeds the volume reference value.

This achieves the technical advantage that the controller can incrementally control the supply of washing liquid to the tub until the sum of the volumes of washing liquid not bound to the laundry exceeds the volume reference value, which leads to a deactivation of the washing liquid supply device.

In an advantageous embodiment of the laundry care appliance, the controller is designed to determine the re-determined amount of washing liquid as a function of the difference between the volume reference value and the volume recorded during the period of time, and/or the controller is designed to determine the re-determined amount of washing liquid on the basis of the recorded textile type To determine laundry and / or based on the detected weight of the laundry.

This achieves the technical advantage that the quantity of washing liquid determined again can be less than the quantity of washing liquid determined during the period of time, so that oversaturation of the laundry with washing liquid can be avoided. This is achieved in that when determining the again determined amount of washing liquid, the difference between the volume of washing liquid already supplied during the wash period and the volume reference value is taken into account and/or that the textile type and/or the weight of the laundry is taken into account.

In an advantageous embodiment of the laundry care appliance, the controller is designed to deactivate the pump during the time period in order to stop pumping the washing liquid through the liquid line when a volume flow value determined as a function of the detected volume falls below a minimum volume flow value.

This achieves the technical advantage that the end of the pumping process can be indicated to the controller when the volume flow falls below the minimum value. A drop in the recorded volume flow below the minimum volume flow value indicates to the controller that there is a very small amount of washing liquid available for pumping around and the pumping process can therefore be ended.

In an advantageous embodiment of the laundry care appliance, the laundry care appliance has a supply sensor which is designed to detect the amount of washing liquid supplied by the washing liquid supply device.

This achieves the technical advantage that the amount of washing liquid supplied during the respective time segment is available to the controller through the supply sensor.

In an advantageous embodiment of the laundry care appliance, the weight detection device comprises a weighing device for weighing the weight of the laundry accommodated in the laundry drum, a device for detecting a lowering of an oscillating system of the laundry drum and/or a device for detecting performance parameters of the drum drive of the laundry drum.

This achieves the technical advantage that the weight detection device ensures an advantageous weight detection of the laundry.

In an advantageous embodiment of the laundry care appliance, the laundry care appliance has a program selection device for selecting a laundry care program from a plurality of laundry care programs, the textile detection device being designed to detect a textile type of the laundry on the basis of the selected laundry care program.

This achieves the technical advantage that the textile detection device can carry out an effective detection of the textile type on the basis of the selected laundry care program.

In an advantageous embodiment of the laundry care appliance, the textile detection device comprises an optical sensor for detecting material properties of a textile type of the laundry, the textile detection device being designed to detect a textile type of the laundry on the basis of the detected material properties.

This achieves the technical advantage of ensuring effective direct detection of the fabric type of the laundry.

In an advantageous embodiment of the laundry care appliance, the laundry care appliance has a drum drive for rotating the laundry drum, and the controller is designed to activate the drum drive while the washing liquid is being pumped through the liquid line in order to rotate the laundry drum at a speed, in particular at a contact speed, in particular between 100 rpm and 200 rpm to rotate to position the laundry on the laundry drum.

This achieves the technical advantage that particularly effective wetting of the laundry with washing liquid can be ensured by the rotation of the laundry drum during the pumping process. In particular, the laundry drum can be rotated at a system speed which is in particular between 100 rpm and 200 rpm. When the laundry drum rotates at the application speed, the laundry lies against the laundry drum, so that it can be ensured that the washing liquid that is pumped around wets the laundry in a particularly advantageous manner.

In an advantageous embodiment of the laundry care appliance, the volume detection device is designed to detect a volume of the washing liquid pumped through the liquid line by the pump during the time period in order to detect the volume of the washing liquid not bound to the laundry.

This achieves the technical advantage that the volume detection device can detect the corresponding volume of the washing liquid not bound to the laundry directly during the pumping process in the time segment. In particular, the volume of the pumped washing liquid corresponds to the volume of the washing liquid not bound to the laundry.

In an advantageous embodiment of the laundry care appliance, the volume detection device includes a flow sensor arranged in the liquid line for detecting a volume flow of the washing liquid pumped through the liquid line, and/or the volume detection device includes a power detection element for detecting an electrical power value of the pump.

This achieves the technical advantage that the elements can ensure effective detection of the volume of the washing liquid by the volume detection device. If the volume detection device includes a flow sensor, the pumped volume of the washing liquid can advantageously be detected based on the detected volume flow of the washing liquid pumped through the liquid line by the pump, and thus the volume of the washing liquid not bound to the laundry can be recorded.

If the volume detection device includes a power detection element for detecting an electrical power value of the pump, the electrical power value detected by the power detection element can advantageously be correlated with the volume flow of the washing liquid pumped through the liquid line by the pump in order to carry out an advantageous volume detection, whereby as a function of time the Pump pumped volume can be obtained, and thus the volume of washing liquid not bound to the laundry can be detected.

In an advantageous embodiment of the laundry care appliance, the laundry care appliance has a drum drive for rotating the laundry drum, and the controller is designed, after the washing liquid has been pumped through the liquid line, to activate the drum drive in order to spin free washing liquid bound to the laundry in order to reduce the amount of washing liquid spun free to obtain, wherein the volume detection device is designed to detect a volume of the circulated washing liquid that has been thrown free in order to detect the volume of the washing liquid that is not bound to the laundry.

This achieves the technical advantage that by detecting the volume of the washing liquid that is spun free, the volume of washing liquid that is not bound to the laundry can be determined in a particularly advantageous manner. After the washing liquid has been pumped around, the laundry drum is rotated and the washing liquid that is not bound to the laundry is spun free and collects in the tub can. In particular, the volume of the washing liquid that is thrown free corresponds to the volume of the washing liquid that is not bound to the laundry.

In an advantageous embodiment of the laundry care appliance, the volume detection device comprises a fill level sensor arranged in the tub, in particular in a lower region of the tub facing the drain opening, for detecting a fill level of the washing liquid in the tub.

This achieves the technical advantage that the volume of the washing liquid, in particular the washing liquid that has been thrown free, can be determined directly in the tub by means of a fill level sensor, in particular a pressure sensor, arranged in the tub for detecting a fill level of the washing liquid in the tub.

In an advantageous embodiment of the laundry care appliance, the controller is designed to determine, during the period of time, a ratio between the amount of washing liquid supplied to the tub and the volume of washing liquid spun free, with the textile detection device being designed to detect a textile type of the laundry on the basis of the determined ratio, and/or or wherein the volume reference value is determined as a function of the determined ratio, as a function of the detected textile type and/or as a function of the detected weight of the laundry.

This achieves the technical advantage that the respective ratio between the supplied quantity of washing liquid and the volume of the washing liquid spun out allows a more precise detection of the textile type of the laundry, or the volume reference value, than if only the volume of the washing liquid spun out is compared with the volume reference value.

According to a second aspect, the object of the invention is achieved by a method for caring for laundry in a laundry care appliance, the laundry care appliance having a tub for receiving washing liquid, the tub having a drain opening and an inlet opening which are fluidically connected by a liquid line, with the laundry care appliance having a laundry drum for receiving laundry, a washing liquid supply device for feeding washing liquid into the tub, a pump which is designed to pump washing liquid through the drain opening into the liquid line and the pumped washing liquid through the inlet opening again to the tub in order to wet the laundry in the laundry drum, a volume detection device for detecting a volume of washing liquid not bound by the laundry, a textile detection device for detecting a textile type of the laundry accommodated in the laundry drum and/or a weight detection device for detecting a weight of the laundry received from the laundry drum, and a controller for controlling the pump and the washing liquid supply device, the method comprising the following steps, determining an amount of washing liquid to be supplied to the tub by the washing liquid supply device on the basis of a detected textile type of the laundry and/or on the basis of a detected Weight of the laundry by the controller, activation of the washing liquid supply device by the controller during a period of time in order to supply the specific amount of washing liquid to the tub, activation of the pump by the controller during the period of time in order to pump the supplied washing liquid through the liquid line, detection of a volume of the the washing liquid bound to the laundry by the volume detection device, deactivation of the washing liquid supply device by the controller after the period of time when the detected volume exceeds a volume reference value, the volume reference value being determined as a function of the detected textile type and/or the detected weight of the laundry and the volume reference value being dependent a desired saturation of the laundry is determined.

This achieves the technical advantage that an advantageous degree of saturation of the laundry to be cared for with washing liquid can be achieved.

In an advantageous embodiment of the method, if the detected volume falls below the volume reference value, the period of time is repeated by the controller in order to determine a washing liquid quantity again, again supply the determined washing liquid quantity to the tub, again detect a volume of washing liquid not bound to the laundry , and the Disable washing liquid supply device when the sum of the volume and the re-detected volume exceeds the volume reference value.

This achieves the technical advantage that the time period can be repeated by the control until the sum of the recorded volumes exceeds the volume reference value, so that an approximation to the advantageous saturation of the laundry can be achieved within the framework of an iterative process.

In an advantageous embodiment of the method, the detection of the volume of the washing liquid that is not bound to the laundry includes the detection of the volume of washing liquid pumped through the liquid line by the pump using the volume detection device.

This achieves the technical advantage that, by detecting the volume of the pumped washing liquid, the volume of the washing liquid that is not bound to the laundry can be recorded in a particularly advantageous manner.

In an advantageous embodiment of the method, the laundry care appliance has a drum drive for rotating the laundry drum, and the method comprises the following steps, activation of the drum drive by the controller after the washing liquid has been pumped through the liquid line during the time segment in order to spin free washing liquid bound to the laundry and to obtain a spun-free amount of washing liquid, detecting a volume of the spun-free washing liquid by the volume-sensing device in order to detect the volume of the washing liquid not bound to the laundry.

This achieves the technical advantage that by detecting the volume of the washing liquid that has been spun free, the volume of the washing liquid that is not bound to the laundry can be recorded in a particularly advantageous manner.

Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

Fig. 1

eine schematische Ansicht eines Wäschepflegegeräts;

Fig. 2

eine schematische Ansicht eines Wäschepflegegeräts mit einer Steuerung;

Fig. 3

eine graphische Darstellung eines Wäschepflegevorgangs gemäß einer Ausführungsform;

Fig. 4

eine graphische Darstellung eines Erfassungsvorgangs eines elektrischen Leistungswerts einer Pumpe eines Wäschepflegevorgangs; und

Fig. 5

eine schematische Darstellung eines Verfahrens zum Pflegen von Wäsche in einem Wäschepflegegerät.

Show it:

1

a schematic view of a laundry care appliance;

2

a schematic view of a laundry care appliance with a controller;

3

Figure 12 is a graphical representation of a laundry care process according to one embodiment;

4

a graphic representation of a detection process of an electrical power value of a pump of a laundry care process; and

figure 5

a schematic representation of a method for caring for laundry in a laundry care appliance.

1 12 shows a schematic view of a general laundry care appliance 100, such as a washing machine. The laundry care appliance 100 includes a dispensing tray 101 into which detergent or other liquid substances can be filled. The laundry care appliance 100 includes a door 103 for loading the laundry care appliance 100 with laundry.

2 shows a schematic view of a laundry care appliance with a controller. The laundry care appliance 100 has a tub 105 for holding washing liquid, and has a laundry drum 107 for holding laundry. The laundry drum 107 has a bottom side 109 of the drum. The tub 105 has a drain opening 111 . The laundry care appliance 100 has an inlet opening 113 . The drain opening 111 is fluidically connected to the inlet opening 113 by a liquid line 115 , a pump 117 for pumping washing liquid through the liquid line 115 being arranged in the liquid line 115 . The pump 117 pumps washing liquid through the drain opening 111 from the tub 105 during an in 2 Not shown pumping process in the liquid line 115 and pumped out the washing liquid through the liquid line 115 and through the inlet opening 113 to the tub 105 and the laundry drum 107 out again. This allows the fresh washing liquid to flow effectively through the liquid line 115 during a laundry care process are pumped around and the laundry in the laundry drum 107 are supplied again.

The laundry care appliance 100 also includes a controller 119 which is connected to the pump 117 by a first control connection 121 and which is connected to a drum drive 123 for rotating the laundry drum 107 by a second control connection 125 .

The controller 119 is also connected via a third control connection 127 to a washing liquid supply device 129 for supplying washing liquid into the tub 105 , the washing liquid supply device 129 being connected to the tub 105 by a supply line 131 .

The controller 119 is also connected by a fourth control connection 133 to a volume detection device 135 for detecting a volume of the washing liquid not bound to the laundry.

The volume detection device 135 can, in particular, as in 2 shown, include a flow sensor arranged in the liquid line 115 for detecting a volume flow of the washing liquid pumped through the liquid line 115 .

The volume detection device 135 can in particular include a fill level sensor arranged in the tub 105, in particular in a lower region of the tub 105 facing the drain opening 111, for detecting a fill level of the washing liquid in the tub 105.

The volume detection device 135 can in particular include a power detection element for detecting an electrical power value of the pump 117 . In this case, the line gripping element is arranged in particular in the pump 115 or the line gripping element is connected to the pump 117 .

The laundry care appliance 100 also includes a weight detection device 137 for detecting a weight of the laundry accommodated in the laundry drum 107, which is connected to the controller 119 by a fifth control connection 139.

The weight detection device 137 comprises, in particular, a weighing device for weighing the weight of the laundry accommodated in the laundry drum 107, a device for detecting a lowering of an oscillating system of the laundry drum 107 and/or a device for detecting performance parameters of the drum drive 123 of the laundry drum 107.

The laundry care appliance 100 also includes a textile detection device 141 for detecting a textile type of the laundry accommodated in the laundry drum 107, which is connected to the controller 119 by a sixth control connection 143.

The textile detection device 141 includes in particular an optical sensor for detecting material properties of a textile type of the laundry, wherein the textile detection device 141 is designed to detect a textile type of the laundry on the basis of the detected material properties.

Textile detection device 141 is designed, in particular, to detect a textile type of the laundry on the basis of a selected laundry care program, with laundry care appliance 100 measuring an in 2 has not shown program selection device for selecting a laundry care program from a plurality of laundry care programs.

The laundry care appliance 100 also includes an outlet line 128 which is fluidically connected to the liquid line 115 . The pump 117 is formed during an in 2 Not shown pumping out washing liquid through the drain opening 111 from the tub 105, through the liquid line 115 and through the outlet line 128 from the laundry care appliance 100 to be pumped.

3 shows a graphic representation of a laundry care process according to a first embodiment.

The representation (a) of 3 FIG. 12 shows the relationship between saturation of the laundry, which is plotted along the axis of ordinates 145, as a function of a weight of the laundry detected by a weight detector 137, which is plotted along the axis of abscissas 147, for various textile types.

The in the representation (a) of 3 The first curve 149 shown shows the linear dependency between a saturation of the first type of textile and the weight of the first type of textile for a first type of textile, in particular terry toweling.

The in the representation (a) of 3 The second curve 151 shown shows the linear dependence between the saturation of the second type of textile and the weight of the second type of textile for a second type of textile, in particular polyester.

The in the representation (a) of 3 The third curve 153 shown shows the relationship between saturation and weight of the laundry stored for a laundry care program selected by a user.

If the controller 119 knows the specific weight of the laundry detected by the weight detection device 137 and if the controller knows the specific textile type of the laundry detected by the textile detection device 141, the controller 119 can use a reference comparison to calculate a quantity assigned to the specific textile type and the specific weight Determine washing liquid which is supplied to the tub 105 by the washing liquid supply device 129 .

In this case, the textile detection device 141 can in particular determine the type of textile as a function of the laundry care program selected by the user, or the textile detection device 141 can detect the type of textile by means of an optical sensor.

The representations (b), (c) and (d) of the 3 show time representations of a quantity of washing liquid supplied by the washing liquid supply device 129 (see representation a), a speed of rotation of the rotating laundry drum 107 (see representation b), and a volume of washing liquid not bound to the laundry (see Diagram c), all of which are plotted along the respective ordinate axis 145 as a function of the time specified along the respective abscissa axis 147.

The in the illustration (b) of 3 The fourth curve 155 shown shows the course over time of the amount 157 of washing liquid supplied to a tub 105 by the washing liquid supply device 129 during a period of time 159, the washing liquid amount 157 being determined by the controller 119 in accordance with illustration (a).

The in the representation (c) of 3 The fifth curve 156 shown shows the course over time of the speed of the laundry drum 107 driven by the drum drive 123.

The in the representation (c) of 3 The sixth curve 158 shown shows the course over time of the volume of the washing liquid not bound to the laundry, detected by volume detection device 135, during time segment 159.

During a first time interval 159-1 of the period 159, washing liquid is supplied to the tub 105 and the supplied washing liquid is supplied to the laundry by being pumped around by the pump 117 in order to wet the laundry with the washing liquid.

After pumping over during the first time interval 159-1, a volume 161-1 of the washing liquid not bound to the laundry is detected by the volume detection device 135 during a subsequent second time interval 159-2 of the time section 159.

Here, the pump 117 can in particular be activated again in order to evaluate whether there is still washing liquid that is not bound to the laundry, which can be determined by the volume detection element 135 . The controller 119 is designed here in particular to deactivate the pump 117 during the time segment 159 in order to stop pumping the washing liquid through the liquid line 115 when the detected volume 161-1 falls below a minimum volume value.

During an optional third time interval 159-3 of the time segment 159, which follows the second time interval 159-2, the rotational speed of the laundry drum 107 is increased.

During a fourth time interval 159-4 of the time segment 159 following the third time interval 159-3, the rotational speed of the laundry drum 107 is increased in order to sling free washing liquid bound to the laundry and to obtain a spun amount of washing liquid. The volume detection device 135 is designed to detect a volume 161-2 of the washing liquid spun free.

During a fifth time interval 159-5 of the time section 159, which follows the fourth time interval 159-3, the pump 117 is activated again in order to pump around the washing liquid that has been spun out and advantageously wet the laundry with the washing liquid that has been spun out.

The controller 119 compares the detected volume 161-2 of the washing liquid spun free with an in 3 volume reference value 163, not shown, and deactivates the washing liquid supply device 129 when the detected volume 161-2 of the washing liquid thrown free exceeds the volume reference value 163. In this way, an advantageous saturation of the laundry with washing liquid can be ensured.

The volume reference value 163 is determined as a function of the textile type detected by the textile detection device 141 and/or the weight of the laundry detected by the weight detection device 137 .

If the detected volume 161-2 falls below the volume reference value 163, the controller 119 repeats the time segment 159 in order to again determine a quantity of washing liquid 157, again supplying the determined quantity of washing liquid 157 to the tub 105, again a volume 161-2 that is not bound to the laundry To detect washing liquid, and to deactivate the washing liquid supply device 129 when the sum of the volume 161-2 and the newly detected volume 161-2 exceeds the volume reference value 163.

Thus, wash liquid can be added to the laundry gradually to ensure effective saturation of the laundry with wash liquid.

In this case, the volume detection element 135 comprises in particular a fill level sensor arranged in the tub 105, in particular in a lower region of the tub 105 facing the drain opening 111, for detecting a fill level of the washing liquid in the tub 105.

Even if in the in the 3 illustrated embodiment, the volume 161-2 of the spun-free washing liquid is recorded as the volume 161-2 of the washing liquid not bound to the laundry by the volume recording device 135, it is alternatively possible that the volume 161-1 of the pump 117 through the liquid line 115 pumped washing liquid as the volume 161 - 2 of the washing liquid not bound to the laundry is detected by the volume detection device 135 .

In this case, volume detection device 135 includes, in particular, a flow sensor arranged in liquid line 115 for detecting a volume flow of the washing liquid pumped through liquid line 115, and/or volume detection device 135 includes a power detection element for detecting an electrical power value of pump 117.

A targeted saturation of the laundry is thus set and undersaturation or oversaturation of the laundry with the washing liquid can be prevented. Only exactly the amount of washing liquid that is required for an advantageous laundry care cycle is added to the laundry. Optimum washing liquid consumption and energy consumption of the laundry care appliance 100 can thus be ensured.

In addition, a particularly advantageous laundry care result is ensured by an optimal saturation of the laundry.

4 shows a graphic representation of a detection process of an electrical power value of a pump of a laundry care process.

According to the present disclosure, the volume detection device 135 for detecting a volume 161 - 1 , 161 - 2 of washing liquid not bound to the laundry can comprise a power detection element for detecting an electrical power value of the pump 117 .

Since the pump 117 pumps washing liquid with a volume flow through the liquid line 115 during a pumping process depending on an electrical power value of the pump 117, there is a correlation between the electrical power value of the pump 117 and the volume flow. The volume flow can be determined from the recorded electrical power value of the pump 117 . If the time is known, the determined volume flow can be converted into a volume 161 - 1 of the washing liquid circulated by the pump 117 .

4 shows the curve of the electrical power value of the pump 117, in particular electrical current, plotted along the ordinate axis 145 as a function of time, which is plotted along the abscissa axis 147. As can be seen from the first and second power curves 165, 167, the electrical power value drops when the pump 117 is no longer delivering washing liquid.

As can be seen from the first power curve 165, when determining the first integral value 169 based on the first power curve 165, power peaks occurring after the electrical power value has dropped for the first time are no longer taken into account.

As can be seen from the second power curve 167, when determining the second integral value 171 based on the second power curve 167, further power peaks occurring after the electrical power value has dropped for the first time are also taken into account, so that the second integral value 171 is above the first integral value 169.

The corresponding volume 161-1, 161-2 of the washing liquid not bound to the laundry can thus be detected by the selected first or second integral value 169, 171, depending on the requirement by the controller 119.

figure 5 shows a schematic representation of a method for caring for laundry in a laundry care appliance.

The method 200 comprises, as a first method step, determining 201 a quantity 157 of washing liquid to be supplied to the tub 105 by the washing liquid supply device 129 on the basis of a detected textile type of the laundry and/or on the basis of a detected weight of the laundry by the controller 119.

The method 200 includes, as a second method step, the activation 203 of the washing liquid supply device 129 by the controller 119 during a period of time 159 in order to supply the specific quantity of washing liquid 157 to the tub 105 .

As a third method step, the method 200 includes the activation 205 of the pump 117 by the controller 119 during the time segment 159 in order to pump the supplied washing liquid through the liquid line 115 .

As an optional fourth method step, the method 200 includes the activation 207 of the drum drive 123 by the controller 119 after the washing liquid has been pumped through the liquid line 115 during the time segment 159 in order to spin free washing liquid bound to the laundry and to obtain a spun amount of washing liquid.

As a fifth method step, the method 200 comprises the detection 209 of a volume 161-1, 161-2 of the washing liquid not bound to the laundry by the volume detection device 135.

As a sixth method step, the method 200 includes the deactivation 211 of the washing liquid supply device 129 by the controller 119 after the period of time 159 when the detected volume 161-1, 161-2 exceeds a volume reference value 163 exceeds, the volume reference value 163 being determined as a function of the detected textile type and/or the detected weight of the laundry.

All of the features explained and shown in connection with individual embodiments of the invention can be provided in different combinations in the object according to the invention in order to realize their advantageous effects at the same time.

The scope of protection of the present invention is given by the claims and is not limited by the features explained in the description or shown in the figures.

Reference List

100

laundry care device

101

dispenser bowl

103

door

105

tub

107

laundry drum

109

drum bottom

111

drain hole

113

intake port

115

liquid line

117

pump

119

steering

121

First control connection

123

drum drive

125

Second control connection

127

Third control link

128

outlet line

129

washing liquid supply device

131

supply line

133

Fourth control connection

135

volume detection device

137

weight detection device

139

Fifth Control Link

141

textile detection device

143

Sixth Control Link

145

ordinate axis

147

abscissa axis

149

First curve

151

Second curve

153

Third curve

155

Fourth curve

156

Fifth curve

157

amount of washer fluid

158

Sixth curve

159

period of time

159-1

First time interval

159-2

second time interval

159-3

Third time interval

159-4

Fourth time interval

159-5

Fifth time interval

161-1

Volume of washing liquid not bound to the laundry

161-2

Volume of the washing liquid thrown free

163

volume reference value

165

First power curve

167

Second performance curve

169

First integral value

171

Second integral value

200

Method of caring for laundry

201

First step: determining the amount of washing liquid

203

Second method step: activation of the washing liquid supply device

205

Third step: activate the pump

207

Optional fourth step: activation of the drum drive

209

Fifth method step: acquisition of a volume

211

Sixth method step: deactivation of the washing liquid supply device

Claims (15)

1. Laundry care appliance (100) with an outer tub (105) for receiving washing liquid, wherein the outer tub (105) has an outlet opening (111) and an inlet opening (113), which are fluidically connected by means of a liquid pipe (115), a laundry drum (107) for receiving laundry, a washing liquid supply facility (129) for supplying washing liquid into the outer tub (105), a pump (117), which is embodied to drain washing liquid through the outlet opening (111) into the liquid pipe (115) and to supply the drained washing liquid through the inlet opening (113) back to the outer tub (105), in order to wet the laundry in the laundry drum (107), a volume recording facility (135) for recording a volume (161-1, 161-2) of washing liquid not bound to the laundry, and a controller (119) for controlling the pump (117) and the washing liquid supply facility (129), wherein the laundry care appliance (100) has a textile recording facility (141) for recording a type of textile of the laundry received in the laundry drum (107) and/or a weight recording facility (137) for recording a weight of the laundry received in the laundry drum (107), wherein

   the controller (119) is embodied to determine a quantity (157) of washing liquid to be supplied to the outer tub (105) through the washing liquid supply facility (129) on the basis of a recorded type of textile of the laundry and/or on the basis of a recorded weight of the laundry, and wherein

   the controller (119) is embodied to activate the washing liquid supply facility (129) during a time segment (159) and to supply the determined quantity of washing liquid (157) to the outer tub (105), characterised in that

   the controller (119) is embodied to activate the pump (117) during the time segment (159) in order to recirculate the supplied washing liquid through the liquid pipe, wherein the volume recording facility (135) is embodied to record a volume (161-1, 161-2) of the washing liquid not bound to the laundry during the time segment (159), and that

   the controller (119) is embodied to deactivate the washing liquid supply facility (129) when the recorded volume (161-1, 161-2) exceeds a volume reference value (163), wherein the volume reference value (163) is determined as a function of the recorded type of textile and/or the recorded weight of the laundry and wherein the volume reference value (163) is determined as a function of a desired saturation of the laundry.
2. Laundry care appliance (100) according to claim 1, characterised in that the controller (119) is embodied, when the recorded volume (161-1, 161-2) does not reach the volume reference value (163), to repeat the time segment (159) in order to determine a quantity of washing liquid (157) again, to supply the determined quantity of washing liquid (157) to the outer tub (105) again, to record a volume (161-1, 161-2) of the washing liquid not bound to the laundry again, and to deactivate the washing liquid supply facility (129) if the total of the volume (161-1, 161-2) and the rerecorded volume (161-1, 161-2) exceeds the volume reference value (163).
3. Laundry care appliance (100) according to claim 2, characterised in that the controller (119) is embodied to determine the redetermined quantity of washing liquid (157) as a function of the difference between the volume reference value (163) and the volume (161-1, 161-2) recorded during the time segment (159), and/or that the controller (119) is embodied to determine the redetermined quantity of washing liquid (157) on the basis of the recorded type of textile of the laundry and/or on the basis of the recorded weight of the laundry.
4. Laundry care appliance (100) according to one of the preceding claims, characterised in that the weight recording facility (137) comprises a weighing facility for weighing a weight of the laundry received in the laundry drum (107), a facility for recording a lowering of an oscillation system of the laundry drum (107) and/or a facility for recording performance parameters of a drum drive (123) of the laundry drum (107).
5. Laundry care appliance (100) according to one of the preceding claims, characterised in that the laundry care appliance (100) has a program selection facility for selecting a laundry care program from a plurality of laundry care programs, wherein the textile recording facility (141) is embodied to record a type of textile of the laundry on the basis of the selected laundry care program.
6. Laundry care appliance (100) according to one of the preceding claims, characterised in that the textile recording facility (141) comprises an optical sensor for recording material properties of a type of textile of the laundry, wherein the textile recording facility (141) is embodied to record a type of textile of the laundry on the basis of the recorded material properties.
7. Laundry care appliance (100) according to one of the preceding claims, characterised in that the volume recording facility (135) is embodied to record a volume (161-1) of the washing liquid recirculated through the liquid pipe (115) by the pump (117) during the time segment (159) in order to record the volume (161-1) of the washing liquid not bound to the laundry.
8. Laundry care appliance (100) according to one of the preceding claims, characterised in that the volume recording facility (135) comprises a flowrate sensor arranged in the liquid pipe (115) for recording a volume flow of the washing liquid pumped through the liquid pipe (115) and/or that the volume recording facility (135) comprises a performance recording element for recording an electrical performance value of the pump (117).
9. Laundry care appliance (100) according to one of the preceding claims, characterised in that the laundry care appliance (100) has a drum drive (123) for rotating the laundry drum (107), and that the controller (119) is embodied, after recirculating the washing liquid through the liquid pipe (115), to activate the drum drive (123) in order to freely spin washing liquid bound to the laundry in order to obtain a freely spun quantity of washing liquid, wherein the volume recording facility (135) is embodied to record a volume (161-2) of the freely spun recirculated washing liquid in order to record the volume (161-2) of the washing liquid not bound to the laundry.
10. Laundry care appliance (100) according to one of the preceding claims, characterised in that the volume recording facility (135) comprises a fill level sensor arranged in the outer tub (105), in particular in a lower region of the outer tub (105) facing the outlet opening (111), for recording a fill level of the washing liquid located in the outer tub (105).
11. Laundry care appliance (100) according to claim 9 or claim 10 in conjunction with claim 9, characterised in that the controller (119) is embodied to determine a ratio between the quantity of washing liquid (157) supplied to the outer tub (105) and the volume (161-2) of the freely spun washing liquid during the time segment (159), wherein the textile recording facility (141) is embodied to record a type of textile of the laundry on the basis of the determined ratio, and/or wherein the volume reference value (163) is determined as a function of the determined ratio, as a function of the recorded type of textile and/or as a function of the recorded weight of the laundry.
12. Method (200) for caring for laundry in a laundry care appliance (100) according to one of claims 1 to 11,
    characterised in that the method (200) comprises the following steps,

    determining (201) a quantity (157) of washing liquid to be supplied to the outer tub (105) by means of the washing liquid supply facility (129) on the basis of a recorded type of textile of the laundry and/or on the basis of a recorded weight of the laundry by the controller (119),

    activating (203) the washing liquid supply facility (129) by means of the controller (119) during a time segment (159), in order to supply the determined quantity of washing liquid (157) to the outer tub (105),

    activating (205) the pump (117) by means of the controller (119) during the time segment (159), in order to recirculate the supplied washing liquid through the liquid pipe (115),

    recording (209) a volume (161-1, 161-2) of the washing liquid not bound to the laundry by means of the volume recording facility (135),

    deactivating (211) the washing liquid supply facility (129) by means of the controller (119) after the time segment (159), when the recorded volume (161-1, 161-2) exceeds a volume reference value (163), wherein the volume reference value (163) is determined as a function of the recorded type of textile and/or the recorded weight of the laundry and wherein the volume reference value (163) is determined as a function of a desired saturation of the laundry.
13. Method (200) according to claim 12, characterised in that when the recorded volume (161-1, 161-2) does not reach the volume reference value (163), the time segment (159) is repeated by the controller (119) in order to determine a quantity of washing liquid (157) again, to supply the determined quantity of washing liquid (157) to the outer tub (105) again, to record a volume (161-1, 161-2) of the washing liquid not bound to the laundry again and to deactivate the washing liquid supply facility (129) when the total of the volume (161-1, 161-2) and the rerecorded volume (161-1, 161-2) exceeds the volume reference value (163).
14. Method (200) according to claim 12 or 13, characterised in that the recording (209) of the volume (161-1, 161-2) of the washing liquid not bound to the laundry comprises the recording of the volume (161-1, 161-2) of washing liquid recirculated through the liquid pipe (115) by the pump (117) by means of the volume recording facility (135).
15. Method (200) according to claim 12 or 13, characterised in that the laundry care appliance (100) has a drum drive (123) for rotating the laundry drum (107), that the method (200) comprises the following steps,

    activating (207) the drum drive (123) by means of the controller (119) after recirculating the washing liquid through the liquid pipe (115) during the time segment (159), in order to freely spin washing liquid bound to the laundry and to obtain a freely spun quantity of washing liquid,

    recording (209) a volume (161-2) of the freely spun washing liquid by means of the volume recording facility (135), in order to record the volume (161-2) of the washing liquid not bound to the laundry.

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