EP4261334A1 - Laundry care device with a control and method for the care of laundry - Google Patents

Abstract

The present invention relates to a laundry care device (100) with a tub (105) for holding washing liquid (129), a laundry drum (107) for holding laundry, the laundry drum (107) being arranged in the tub (105), and a drum drive (109) for rotating the laundry drum (107), a heating element (120) for heating the washing liquid (129) in the tub (105), a temperature sensor (123) for detecting a temperature of washing liquid (129) in the tub (105) and a controller (119), which is connected in terms of control technology to the drum drive (109), the heating element (120) and the temperature sensor (123). The controller (119) is designed to control the drum drive (157-1) during a first expulsion period (157-1). 109) for rotating the laundry drum (107) at a first output speed (159-1) to activate the laundry (127) picked up in the laundry drum (107) to the laundry drum (107) and that bound to the laundry (127). To at least partially expel washing liquid (129) from the laundry (127), the temperature sensor (123) being designed to detect a temperature of washing liquid (129) in the tub (105) during the first expulsion period (157-1).The control (119) is designed to detect a first and second temperature value (158, 160) of the washing liquid (129) during the first expulsion period (157-1), to determine a temperature difference dT_mix (175) from the first and second temperature values, during a After the first expulsion period (157-1), the second expulsion period (157-2) is activated to activate the drum drive (109) for rotating the laundry drum (107) at a second expulsion speed (159-2) in order to achieve the speed in the laundry drum (107). to place the picked up laundry (127) on the laundry drum (107) and to at least partially expel the washing liquid (129) bound to the laundry (127) from the laundry (127) if the determined temperature difference dT_mix (175) is smaller than a target temperature difference The controller (119) is designed not to initiate a second expulsion period (157-2) after the first expulsion period (157-1) if the temperature difference dT_mix (175) determined during the first expulsion period (157-1) is greater than or equal to the target temperature difference .

Description

The present invention relates to a laundry care device with a control and a method for caring for laundry in the laundry care device.

In a conventional laundry care device, different methods are used to care for the laundry stored in the laundry drum. Here, the laundry drum is rotated within the tub filled with washing liquid, in particular at different speeds, in order to advantageously move the laundry picked up in the laundry drum and the washing liquid picked up in the tub. This makes it possible to provide advantageous contact between the laundry and the washing liquid in order to ensure an effective transfer of laundry care substance or heat from the washing liquid to the laundry.

In order to ensure effective laundry care for the laundry stored in the laundry drum, all areas of the laundry must have the temperature required for the laundry care substance. Due to the unpredictable movement behavior of the laundry within the rotating laundry drum, it can happen in conventional laundry care devices that certain items of laundry, in particular in the core of the laundry held in the laundry drum, do not come into sufficient contact with the washing liquid and are therefore not heated to the required temperature and the laundry is not treated evenly, which can potentially affect the quality of laundry care. Direct measurement of the temperature of the laundry in order to determine whether the laundry core has warmed up sufficiently is also complex or even impossible with some laundry care devices.

In the WO 2009/112222 A1 an adjustment of speeds of a laundry drum in a drum washing machine is disclosed.

In the DE 10 2017 219 043 A1 a laundry care device with load detection is disclosed.

It is the object underlying the invention to provide a laundry care device with which an advantageous laundry care process can be ensured, in which in particular the laundry picked up in the laundry drum can be brought to the desired temperature for treatment evenly, quickly and with the lowest possible energy expenditure. Furthermore, the task is to provide an appropriate method for caring for laundry

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

• das Heizelement vor und/oder während eines ersten Austriebzeitabschnitts zu aktivieren, um die in dem Laugenbehälter aufgenommene Waschflüssigkeit zu erwärmen,
• während des ersten Austriebzeitabschnitts den Trommelantrieb zum Rotieren der Wäschetrommel mit einer ersten Austriebdrehzahl zu aktivieren, um die in der Wäschetrommel aufgenommene Wäsche an die Wäschetrommel anzulegen und die an die Wäsche gebundene Waschflüssigkeit zumindest teilweise aus der Wäsche auszutreiben, während des ersten Austriebzeitabschnitts mit dem Temperatursensor einen ersten Temperaturwert T1 und zumindest einen zweiten Temperaturwert T2 der in dem Laugenbehälter zugeführten Waschflüssigkeit zu erfassen und eine Temperaturdifferenz dT_mix zu ermitteln, die aus dem ersten Temperaturwert T1 minus dem zweiten Temperaturwert T2 gebildet ist (dT_mix = T1 - T2),
• während des ersten Austriebzeitabschnitts und/oder am Ende des ersten Austriebzeitabschnitts die Temperaturdifferenz dT_mix mit einer Zieltemperaturdifferenz zu vergleichen und
• wenn die Temperaturdifferenz dT_mix kleiner als die Zieltemperaturdifferenz ist, dann
  • ∘ während eines sich an den ersten Austriebzeitabschnitt anschließenden zweiten Austriebzeitabschnitts den Trommelantrieb zum Rotieren der Wäschetrommel mit einer zweiten Austriebdrehzahl zu aktivieren, um die in der Wäschetrommel aufgenommene Wäsche an die Wäschetrommel anzulegen und die an die Wäsche gebundene Waschflüssigkeit zumindest teilweise aus der Wäsche auszutreiben,
    oder sonst
  • ∘ nach dem ersten Austriebzeitabschnitt keinen zweiten Austriebzeitabschnitt zu initiieren.

According to a first aspect, the object according to the invention is achieved by a laundry care device, with a tub for holding washing liquid, a laundry drum for holding laundry, the laundry drum being arranged in the tub, a drum drive for rotating the laundry drum, a heating element for heating the washing liquid in the tub, a temperature sensor, which is designed to detect a temperature of washing liquid in the tub, and a controller, which is connected in terms of control technology to the drum drive, the heating element and the temperature sensor, the controller being designed,

• to activate the heating element before and/or during a first expulsion period in order to heat the washing liquid contained in the tub,
• during the first expulsion period to activate the drum drive for rotating the laundry drum at a first expulsion speed in order to place the laundry received in the laundry drum on the laundry drum and to at least partially expel the washing liquid bound to the laundry from the laundry, during the first expulsion period with the temperature sensor to detect a first temperature value T1 and at least a second temperature value T2 of the washing liquid supplied to the tub and to determine a temperature difference dT_mix, which is formed from the first temperature value T1 minus the second temperature value T2 (dT_mix = T1 - T2),
• to compare the temperature difference dT_mix with a target temperature difference during the first budding period and/or at the end of the first budding period and
• if the temperature difference dT_mix is smaller than the target temperature difference, then
  • ∘ during a second expulsion period following the first expulsion period, to activate the drum drive for rotating the laundry drum at a second expulsion speed in order to place the laundry received in the laundry drum on the laundry drum and at least partially expel the washing liquid bound to the laundry from the laundry,
    or else
  • ∘ not to initiate a second budding period after the first budding period.

This achieves the technical advantage that the control carries out the second expulsion period or not depending on the temperature of the washing liquid in the tub recorded during the first expulsion period and depending on a temperature drop or temperature difference in the detected temperature of the washing liquid determined during the first expulsion period carries out.

In particular, the temperature of the washing liquid in the tub recorded during the first expulsion period can include the first temperature value T1 of the washing liquid at the beginning of the first expulsion period and the second temperature value T2 at the end of the first expulsion period, or can be the temperature of the washing liquid recorded during the first expulsion period in the Lye container includes a maximum temperature difference, which is formed from all temperature values T1, T2 recorded during the first expulsion period.

By detecting the temperature of the washing liquid during the first expulsion period, the control can draw conclusions about the heating and wetting efficiency of the batch of laundry to be treated with washing liquid, in which case it can be determined in particular whether the entire batch of laundry has been removed after the first expulsion period completely, ie also a core of the laundry, has been brought to a substantially uniform temperature, in particular to the required temperature, or not, in order to ensure effective laundry care for all items of laundry in the batch of laundry. Particularly advantageously, conclusions can be drawn in a simple manner about the temperature reached by the laundry in the core, whereby a complex direct temperature measurement of the laundry is not necessary, since the inventive solution provides an indirect determination of the laundry temperature by detecting the temperature of the washing liquid.

In the present case, the core of the laundry, also called the laundry core, is understood to mean an internal area of a laundry volume or batch of laundry formed by one or more laundry items. The inner area is thus surrounded by laundry, with the laundry core preferably being understood as the innermost area of the batch of laundry. The size of the laundry core depends on the size or volume of the item of laundry or batch of laundry. A batch of laundry can also have several laundry cores, especially if the batch of laundry is moved and partial batches of laundry form within the drum.

During an expulsion period, the laundry drum rotates at the expulsion speed, which is sufficiently high that the laundry is placed on the laundry drum due to the centrifugal force acting on it and the washing liquid bound to the laundry is expelled from the laundry, in particular along a radial expulsion direction. When the washing liquid is expelled, it also partially comes into contact with the laundry core, in which heat transfer can also occur from the expelled washing liquid and the laundry items located in the laundry core. The washing liquid expelled from the laundry is further removed from the laundry drum through openings in the laundry drum and collects in the tub, whereby the washing liquid expelled mixes with the further washing liquid that is not bound to the laundry, also referred to as free washing liquid. The temperature of the washing liquid received in the tub and mixed with the expelled washing liquid can be detected by the temperature sensor.

Since the movement behavior of the laundry during the expulsion period is difficult to predict, agglomerations of laundry items can occur, which prevents the laundry from being evenly distributed in the rotating laundry drum, which can impair effective expulsion of the washing liquid from the laundry during the expulsion period. so that, in particular within a core of agglomerations of laundry items (partial laundry batches), no complete wetting of the laundry or complete exchange of the washing liquid bound in the laundry core with the free washing liquid has taken place. It can therefore be assumed that the temperature of the laundry in the core of the partial laundry batch or the temperature of the washing liquid bound in the core of the partial laundry batch differs from the temperature of the remaining laundry batch or the washing liquid bound therein.

In addition, the textile type of the laundry or the load quantity of the laundry can also influence the ability of the laundry to absorb or retain washing liquid.

In particular, the laundry care appliance has a washing liquid supply device for supplying washing liquid into the tub, the control being designed to supply the washing liquid supply device for supplying washing liquid into the tub before the expulsion period, in particular before a scooping period and/or before an investment period and/or before an intermediate period Activate the tub. Furthermore, the control is preferably designed to activate a wetting step during and/or after supplying the washing liquid in order to wet the laundry with the supplied washing liquid. The scooping time period and/or the application time period can in particular be part of the wetting step.

Furthermore, the first expulsion period and/or the second expulsion period can in particular be part of a wetting step, a washing step or a rinsing step of a laundry care program stored in the control of the laundry care device.

A laundry care device is a device that is used to care for laundry, such as a washing machine or a washer-dryer. In particular, such a laundry care device is understood to mean a household laundry care device. In other words, a laundry care device that is used as part of household management and with which laundry is treated in normal household quantities.

At the beginning of the first expulsion period, the temperature of the heated washing liquid in the tub is generally greater than the temperature of the core of the laundry, or the washing liquid contained in the core of the laundry, since complete heat transfer to the core of the laundry has not yet taken place.

A decrease in the detected temperature of the washing liquid during the first expulsion period indicates that the temperature of the washing liquid expelled from the laundry is lower than the temperature of the free washing liquid, in particular the temperature of the washing liquid expelled from the laundry core is lower than the temperature in the outer region The washing liquid bound to the batch of laundry, which is in direct contact with the free washing liquid and therefore has essentially the same temperature as the free washing liquid.

If the temperature of the free washing liquid has now cooled down by a target temperature difference, it can advantageously be recognized that a sufficient exchange of the washing liquid has also taken place in the core of the laundry, since the expelled washing liquid has been cooled by the laundry core and / or the washing liquid bound therein, and the The first budding period must be ended. This means that the drum drive is deactivated and the laundry lying on the laundry drum can fall off the wall of the laundry drum, which means that the laundry items can be rearranged within the batch of laundry. Repositioning the laundry in this way means that items of laundry that were previously on the inside (laundry core) can also reach the outer area of the laundry item and come into direct contact with the free washing liquid. This advantageously supports wetting and heat exchange of the laundry core formed in the previous expulsion period with the free washing liquid. Furthermore, the cooled washing liquid can be further heated to a target temperature T_setpoint using the heating device.

Since the corresponding "cooler" washing liquid is expelled from the core of the laundry by the rotation of the laundry drum during the first expulsion period and mixes with the heated washing liquid in the tub, the temperature recorded during the first expulsion period, in particular the mixing temperature, drops.

Thus, by detecting the corresponding temperature of the washing liquid in the tub using the temperature sensor during the first expulsion period, determining a temperature difference dT_mix and a corresponding comparison of the determined temperature difference dT_mix with a target temperature difference, an effective correlation to the heating of the core of the laundry can be obtained.

In particular, by comparing the temperature difference dT_mix of the washing liquid determined during the first expulsion period with the target temperature difference, the control can determine whether the laundry has been heated uniformly and accordingly no second expulsion period needs to be initiated, or whether the laundry has not been completely heated and accordingly the second budding period is carried out. In this context, “even heating of the laundry” means that essentially all items of laundry have reached the same temperature, especially the core of the laundry.

In particular, the control can determine by an additional comparison of a temperature value of the washing liquid determined during the first expulsion period with the target temperature T_setpoint whether the laundry has been completely heated and a heating phase can accordingly be ended. The additional comparison is preferably carried out after the laundry has been uniformly heated. This has the advantage that it can be ensured that essentially all items of laundry have reached the same temperature, especially the core of the laundry. In this context, this state of the laundry is also understood as “complete heating” to the target temperature T_setpoint.

A “target temperature T_setpoint” is understood to mean a temperature that is assigned to a laundry care process selected by an operator or is set by the operator for carrying out the laundry care process.

The target temperature T_setpoint is in particular a parameter that is also dependent on the type of laundry care device or the type of laundry care process, which is either stored in the control of the laundry care device or is determined by the control.

Furthermore, a “limit temperature T_max” can be set by the control, which is understood as a temperature that is particularly dependent on the target temperature T_setpoint and/or on the laundry care process selected by an operator and is set equal to or greater than the target temperature T_setpoint. The limit temperature T_max can be selected by the controller from values stored in the controller. If the limit temperature T_max is set to be greater than the target temperature T_soll, this has the technical advantage of enabling faster heating of the laundry, since the heat transfer from the heated washing liquid and to the laundry is accelerated. If overheating is to be avoided, particularly with sensitive items of laundry, the limit temperature T_max can also be equal to the target temperature T_setpoint.

In particular, the controller is designed to determine the target temperature and/or the limit temperature T_max as a function of at least one of the following parameters, recorded dry weight of the laundry received in the laundry drum, total amount of washing liquid supplied to the tub, not to the laundry during the first expulsion period bound washing liquid present in the tub, the first output speed, the geometry of the laundry drum and / or the geometry of the tub.

In an advantageous embodiment, the control is designed to activate the drum drive during the first expulsion period in order to rotate the laundry drum at a predetermined first expulsion speed during the first expulsion period, and/or the control is designed to activate the drum drive during the first expulsion period, to rotate the laundry drum for a predetermined first period of time during the first expulsion period.

This achieves the technical advantage that the predetermined period of time and/or the predetermined first output speed of the first output time period Effective comparability for the control can be ensured so that the corresponding temperature value recorded during the first expulsion period can be effectively correlated with the temperature of the laundry.

In an advantageous embodiment, the controller is designed to activate the temperature sensor during the first expulsion period depending on the activation of the heating element, in particular at the same time as the activation of the heating element.

This achieves the technical advantage of avoiding unnecessary activation of the temperature sensor. The washing liquid is heated by the activated heating element, so that the temperature of the heated washing liquid can advantageously be measured by the temperature sensor. In particular, the temperature sensor is activated by the controller at the beginning of the first sprouting period. In particular, the temperature sensor is deactivated by the controller at the end of the first sprouting period. The temperature sensor can also be activated or remain activated before or after a budding period.

In particular, the temperature sensor determines a plurality of temperature values during the first expulsion period. In particular, the temperature value of the plurality of temperature values determined during the first expulsion period is compared by the controller with the target temperature value T_soll, which has the lowest value, and/or is measured by the temperature sensor at the end of the first expulsion period.

In an advantageous embodiment, the control is designed to activate the temperature sensor during the first expulsion period when the speed of the laundry drum reaches the first expulsion speed.

This achieves the technical advantage that a temperature measurement coordinated with the start of the first sprouting period can be carried out during the first sprouting period. This makes it possible, in particular, to prevent temperature values recorded before the start of the first sprouting period from complicating the subsequent comparison carried out by the controller.

In an advantageous embodiment, the control is designed to activate the drum drive during the second expulsion period following the first expulsion period in order to set the second expulsion speed of the rotating laundry drum and/or a second duration of the second expulsion period depending on the period during the first and/or second expulsion period to change the detected temperature of washing liquid in the tub, in particular depending on the temperature difference dT_mix determined during the first and / or second expulsion period. In particular, the second expulsion period can immediately follow the first expulsion period, i.e. the drum drive activated in the first expulsion period remains activated.

This achieves the technical advantage that the temperature of the washing liquid recorded during the first and/or second expulsion period can be used by the controller to optimize the second expulsion speed and/or the second period of time of the rotating laundry drum in such a way that the probability is increased can ensure that after the second expulsion period, the recorded temperature reaches or falls below the target temperature value T_soll. By increasing the expulsion speed and/or the time period, additional washing liquid bound in the core of the laundry can advantageously be expelled and mixed with the unbound washing liquid (free washing liquid). The cooling of the detected temperature indicates that the washing liquid bound in the laundry has mixed with the free washing liquid. If the temperature of the (free) washing liquid has now cooled down by a target temperature difference, a sufficient exchange of the washing liquid can also be advantageously recognized in the core of the laundry and the second expulsion period can be ended. This means that the drum drive is deactivated and the laundry lying on the laundry drum can fall off the wall of the laundry drum, which means that the laundry items can be rearranged within the batch of laundry. Repositioning the laundry in this way means that items of laundry that were previously on the inside (laundry core) can also reach the outer area of the laundry item and come into direct contact with the free washing liquid.

This advantageously supports wetting and heat exchange of the laundry core formed in the previous expulsion period with the free washing liquid. Furthermore, the cooled washing liquid can be further heated to the target temperature T_setpoint using the heating device.

In particular, the controller is designed to activate the drum drive during the second expulsion period in order to increase the second expulsion speed of the rotating laundry drum and/or a second duration of the second expulsion period, in particular depending on the temperature of washing liquid detected during the first and/or second expulsion period in the tub. Preferably, the second expulsion period immediately follows the first expulsion period, in which case the drum drive activated in the first expulsion period also remains activated.

In an advantageous embodiment, the control is designed to activate the drum drive during the second drive-out period in order to increase the speed of the laundry drum rotating at the second drive-out speed, in particular to increase it to an increased second drive-out speed, if during and/or at the end of the first The temperature difference dT_mix of the washing liquid in the tub is smaller than the target temperature difference.

This achieves the technical advantage that by increasing the second expulsion speed to the increased second expulsion speed, the probability of driving out further washing liquid during the second expulsion period can be increased in order to enable contact of the washing liquid with the laundry core and the heat transfer, whereby the detected temperature of washing liquid in the tub will continue to fall if sufficient heat exchange has not yet taken place in the laundry core.

In an advantageous embodiment, the control is designed to activate the drum drive during the second expulsion period in order to increase the second period of time of the rotating laundry drum, in particular to increase it to an increased second period of time when the temperature difference detected during and/or at the end of the first expulsion period dT_mix is smaller than the target temperature difference.

As a result, as with an increase in the speed in the second expulsion period, the technical advantage is achieved that by increasing the second period of time, the probability of driving out further washing liquid during the second expulsion period can be increased in order to ensure contact between the washing liquid and the laundry core and the heat transfer possible, whereby the detected temperature of washing liquid in the tub can drop further if sufficient heat exchange has not yet taken place in the laundry core.

In an advantageous embodiment, the controller is designed not to initiate a further expulsion period after the second expulsion period if a temperature of the washing liquid in the tub detected by the temperature sensor during the second expulsion period or after the second expulsion period is greater than or equal to the limit temperature T_max, and the control is designed to activate the heating element before and/or during the first expulsion period, the activation of the drum drive during the first expulsion period, the determination of the temperature difference dT_mix during and/or at the end of the first expulsion period, the comparison of the temperature difference dT_mix with the target temperature difference and to repeat the activation of the drum drive during the second expulsion period following the first expulsion period, in particular with the inventive and preferred features described above, if the temperature of the washing liquid detected by the temperature sensor during the second expulsion period or after the second expulsion period is less than is the limit temperature T_max of the washing liquid.

This achieves the technical advantage that, depending on the success of the complete heating of the laundry with washing liquid during the second expulsion period, the control either no longer has to carry out another expulsion period after the second expulsion period, or carries out the previously described sections after the second expulsion period, in the latter If the control in particular carries out a plurality of further expulsion time periods until the respective detected temperature of the washing liquid is equal to or greater than the target temperature T_soll or the limit temperature T_max of the washing liquid. This makes it particularly advantageous to heat the entire batch of laundry down to its core to the target temperature T_soll is ensured, which in particular enables even cleaning of all items of laundry.

In an advantageous embodiment, the laundry care device has an unbalance sensor for detecting an unbalance of the rotating laundry drum, the control being designed to activate the drum drive during the first and/or second expulsion period (also referred to as a further expulsion period) in order to operate the laundry drum with a reduced to rotate at a further output speed if the unbalance sensor detects an imbalance in the rotating laundry drum during the first and / or second output period.

This achieves the technical advantage that the reduced further output speed can prevent damage to the laundry care device due to an imbalance that occurs in the rotating laundry drum loaded with laundry.

In particular, the controller is designed to activate the drum drive during the further expulsion period in order to rotate the laundry drum with an increased second and/or further period of time if the unbalance sensor detects an imbalance of the rotating laundry drum during the first and/or second expulsion period.

The increased second and/or further period of time can ensure, despite the reduced further expulsion speed during the further expulsion period, that an effective heat exchange between the heated washing liquid and the entire laundry is achieved even if an imbalance occurs.

The unbalance sensor includes in particular a power detection element for detecting an electrical power value of the drum drive of the laundry drum, and/or a device for detecting a deflection or acceleration of a vibration system of the laundry drum, and/or a 3D sensor for detecting a deflection of the laundry drum in all three spatial directions.

Here, the spatial deflection of the oscillation system can be translated into the acceleration of the deflection, in particular via the speed of the deflection of the oscillation system of the oscillation system can be mathematically converted into an unbalance value. The unbalance of the laundry drum or the laundry drum filled with laundry is preferably determined by comparing the determined unbalance value with an unbalance limit value.

In an advantageous embodiment, the control is designed to activate the drum drive during at least one system period before or after the first expulsion period in order to rotate the laundry drum at a system speed, the system speed comprising a speed of the laundry drum at which the laundry picked up in the laundry drum rests against the laundry drum while the laundry drum is rotating.

This achieves the technical advantage that by changing the speed of the laundry drum, the movement behavior of the laundry picked up in the laundry drum can be advantageously influenced. In particular, the system speed is lower than the output speed, so that when the laundry drum rotates at the system speed, the laundry is in contact with the laundry drum due to the centrifugal force acting, but the centrifugal force is not so great that washing liquid could be expelled from the laundry.

Furthermore, the system speed is preferably greater than a limit speed at which the outer laundry items of the laundry received in the laundry drum begin to permanently attach to the laundry drum during the rotation of the laundry drum. The limit speed is therefore the speed at which a centrifugal acceleration of 1 g acts on the outer laundry items. A system speed that is above the limit speed has the advantage that at least the majority of the laundry placed in the laundry drum lies against the laundry drum and forms a laundry ring.

In an advantageous embodiment, the control is designed to activate the drum drive during at least one scooping period before or after the first expulsion period in order to rotate the laundry drum at a scooping speed, the scooping speed comprising a speed of the laundry drum at which the laundry in the tub absorbed washing liquid is at least partially moved through the laundry drum and falls onto the laundry picked up in the laundry drum.

This achieves the technical advantage that by changing the speed of the laundry drum, the movement behavior of the laundry picked up in the laundry drum can be advantageously influenced. In particular, the scooping speed is lower than the output speed and also lower than the system speed, in particular lower than the limit speed, so that when the laundry drum rotates at the scooping speed, the laundry is not completely carried through the washing drum, but the washing liquid present in the laundry drum is carried through rotating laundry drum is carried as part of a scooping process and in particular falls from above onto the laundry in the laundry drum in order to ensure effective wetting of the laundry.

In order to ensure effective movement of the washing liquid, in particular scooping of the washing liquid, the laundry drum in particular has a plurality of projections, in particular laundry scoops, which move or take the washing liquid with it as the laundry drum rotates.

In an advantageous embodiment, the control is designed to activate the drum drive during at least one intermediate period before or after the expulsion period in order to rotate the laundry drum in an intermediate speed range, the intermediate speed range comprising a range of speeds of the laundry drum, which is between the system speed and a Scoop speed of the laundry drum extends.

This achieves the technical advantage that by changing the speed of the laundry drum from the system speed over the intermediate speed range to the scooping speed, or from the scooping speed over the intermediate speed range to the system speed, the movement behavior of the laundry picked up in the laundry drum can be advantageously influenced.

1. A) Aktivieren des Heizelements durch die Steuerung, um die in dem Laugenbehälter aufgenommene Waschflüssigkeit zu erwärmen,
2. B) Aktivieren des Trommelantriebs zum Rotieren der Wäschetrommel mit einer ersten Austriebdrehzahl durch die Steuerung während eines ersten Austriebzeitabschnitts, um die in der Wäschetrommel aufgenommene Wäsche an die Wäschetrommel anzulegen und die an die Wäsche gebundene Waschflüssigkeit zumindest teilweise aus der Wäsche auszutreiben,
3. C) Aktivieren des Temperatursensors durch die Steuerung während des ersten Austriebzeitabschnitts, um während des ersten Austriebzeitabschnitts eine Temperatur von Waschflüssigkeit in dem Laugenbehälter zu erfassen,
4. D) Erfassen eines ersten Temperaturwerts T1 und zumindest eines zweiten Temperaturwerts T2 der in dem Laugenbehälter zugeführten Waschflüssigkeit,
5. E) Ermitteln einer Temperaturdifferenz dT_mix, die aus dem ersten Temperaturwert T1 minus dem zweiten Temperaturwert T2 gebildet ist,
6. F) Vergleichen der Temperaturdifferenz dT_mix mit einer Zieltemperaturdifferenz und wenn die Temperaturdifferenz dT_mix kleiner als die Zieltemperaturdifferenz ist, dann
   1. 1) Aktivieren des Trommelantriebs zum Rotieren der Wäschetrommel mit einer zweiten Austriebdrehzahl durch die Steuerung während eines sich an den ersten Austriebzeitabschnitt anschließenden zweiten Austriebzeitabschnitts, um die in der Wäschetrommel aufgenommene Wäsche an die Wäschetrommel anzulegen und die an die Wäsche gebundene Waschflüssigkeit zumindest teilweise aus der Wäsche auszutreiben, oder sonst
   2. 2) Nicht-Initiieren des zweiten Austriebzeitabschnitts nach dem ersten Austriebzeitabschnitt durch die Steuerung.

According to a second aspect, the object according to the invention is achieved by a method for caring for laundry in a laundry care device, wherein the laundry care device a tub for holding washing liquid, a laundry drum for holding laundry, the laundry drum being arranged in the tub, a heating element for heating the washing liquid in the tub, a drum drive for rotating the laundry drum, a temperature sensor for detecting a temperature of washing liquid is formed in the tub, and has a controller which is connected in terms of control technology to the drum drive, the heating element and the temperature sensor, the method having the following method steps,

1. A) activating the heating element by the control in order to heat the washing liquid contained in the tub,
2. B) activating the drum drive to rotate the laundry drum at a first output speed by the control during a first output time period in order to place the laundry received in the laundry drum on the laundry drum and at least partially expel the washing liquid bound to the laundry from the laundry,
3. C) activating the temperature sensor by the controller during the first expulsion period in order to detect a temperature of washing liquid in the tub during the first expulsion period,
4. D) detecting a first temperature value T1 and at least a second temperature value T2 of the washing liquid supplied to the tub,
5. E) determining a temperature difference dT_mix, which is formed from the first temperature value T1 minus the second temperature value T2,
6. F) Comparing the temperature difference dT_mix with a target temperature difference and if the temperature difference dT_mix is smaller than the target temperature difference, then
   1. 1) Activating the drum drive to rotate the laundry drum at a second output speed by the control during a second output period following the first output period in order to place the laundry received in the laundry drum on the laundry drum and at least partially remove the washing liquid bound to the laundry from the laundry to drive out, or else
   2. 2) Not initiating the second expulsion period after the first expulsion period by the controller.

This achieves the technical advantage of effective heat transfer The implementation of the second expulsion period depending on the core of the laundry is carried out or not.

Here, the order or time of activating the heating element, drum drive, and/or temperature sensor before and/or during the first expulsion period is in particular not fixed to the order mentioned in the second aspect, but in particular can be changed.

In an advantageous embodiment, the method includes changing the second output speed of the rotating laundry drum during the second output period and/or changing a second time period of the second output period depending on the temperature of washing liquid in the tub, in particular, detected during the first and/or second output period depending on the temperature difference dT_mix determined during the first and/or second budding period.

This achieves the technical advantage that an effective adjustment of the second budding period can be ensured.

In an advantageous embodiment, the method comprises repeating steps A) to F) and their advantageous developments if the temperature of the washing liquid detected by the temperature sensor during the second expulsion period is smaller than the target temperature T_setpoint and/or the limit temperature T_max of the washing liquid, and the method includes not initiating a further expulsion period after the second expulsion period by the control or not repeating steps A) to F) if the temperature of the washing liquid detected by the temperature sensor during the second expulsion period is equal to or greater than the target temperature and / or the limit temperature T_max of the washing liquid is.

This achieves the technical advantage that the control can advantageously decide whether a further expulsion period is necessary after the second expulsion period or not and whether the batch of laundry has been heated to the target temperature T_setpoint up to the laundry core.

The embodiments marked as advantageous embodiments for the laundry care appliance according to the first aspect are also advantageous embodiments for the method according to the second aspect, and vice versa.

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;

Figs. 3A, 3B

schematische Ansichten von Rotationsvorgängen einer Wäschetrommel;

Fig. 4 eine

schematische Ansicht eines zeitlichen Abschnitts eines Wäschepflegevorgangs;

Fig. 5A

Ausschnitt aus der schematischen Ansicht eines zeitlichen Abschnitts eines Wäschepflegevorgangs;

Fig. 5B

eine weitere schematische Ansicht eines Abschnitts eines Wäschepflegevorgangs;

Fig. 6

eine schematische Ansicht eines Wäschepflegevorgangs gemäß einer Ausführungsform; und

Fig. 7

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

Show it:

Fig. 1

a schematic view of a laundry care device;

Fig. 2

a schematic view of a laundry care device with a control;

Figs. 3A, 3B

schematic views of rotation processes of a laundry drum;

Fig. 4 one

schematic view of a time segment of a laundry care process;

Fig. 5A

Detail from the schematic view of a time segment of a laundry care process;

Fig. 5B

another schematic view of a portion of a laundry care process;

Fig. 6

a schematic view of a laundry care process according to an embodiment; and

Fig. 7

a schematic representation of a method for caring for laundry in a laundry care device according to one embodiment.

Fig. 1 shows a schematic view of a general laundry care appliance 100, such as a washing machine. The laundry care device 100 includes a dispenser bowl 101 into which laundry care substance, such as detergent or other liquid substances, can be filled. The laundry care device 100 has a device housing 102. The Laundry care device 100 includes an appliance door 103 for loading the laundry care device 100 with laundry.

Fig. 2 shows a schematic view of a laundry care device with a control. The laundry care device 100 has a tub 105 for holding washing liquid, and has a laundry drum 107 for holding laundry. The laundry drum 107 is arranged in the tub 105. The laundry care device 100 has a drum drive 109 for rotating the laundry drum 107. The tub 105 has a drain opening 111. The drain opening 111 is fluidly connected to a pump 117 through a liquid line 115. The pump 117 can drain washing liquid through the drain opening 111 from the tub 105 during an in Fig. 2 pumping process, not shown, into the liquid line 115 and further pump it out of the laundry care appliance 100 through an outlet line 125.

The laundry care appliance 100 has a washing liquid supply device 118-1 for supplying washing liquid into the tub 105, the washing liquid supply device 118-1 being connected to the tub 105 by a supply line 118-2.

In particular, the washing liquid supply device 118-1 includes an in Fig. 2 101 of the laundry care appliance 100, not shown, and/or an in Fig. 2 fresh water connection, not shown, of the laundry care appliance 100, wherein a controller 119 of the laundry care appliance 100 is designed to activate a washing liquid inlet via the dispenser tray 101 and/or the fresh water connection in order to supply washing liquid and/or fresh water as washing liquid into the laundry drum 107.

The laundry care appliance 100 has a heating element 120 arranged in the tub 105, which is designed to heat the washing liquid in the tub 105, the heating element 120 being connected to the controller 119 in terms of control technology.

The laundry care device 100 also has a temperature sensor 123 for detecting a temperature of washing liquid in the tub 105. In particular, the temperature sensor 123 is arranged in the tub 105.

The laundry care device 100 further comprises the control 119, which is connected to the pump 117, which is connected to the drum drive 109, which is connected to the washing liquid supply device 118-1, which is connected to the heating element 120, and which is connected to the temperature sensor 123, each through a control connection 121.

In particular, this indicates Fig. 2 Laundry care device 100 shown does not have a pumping function, but the invention could also be used in laundry care devices with a pumping function.

The Figures 3A and 3B show schematic views of the rotation processes of a laundry drum.

In order to activate the laundry care substance and to efficiently remove contaminants from the laundry 127 in the laundry drum 107, the washing liquid 129 contained in the tub 105 must be heated. A corresponding one in the Fig. 3A Heating element 120 shown for heating the washing liquid 129 is arranged in particular on the underside of the tub 105 within the tub 105.

In the Fig. 3A a laundry drum 107 arranged in a tub 105 of a laundry care appliance 100 is shown schematically, the laundry drum 107 rotating at a low speed. The laundry 127 received in the laundry drum 107 and the free washing liquid 129 received in the tub 105 are shown schematically. The laundry drum 107 also has a plurality of projections 133 on the inside, which are designed to move the laundry 127 received in the laundry drum 107 as well as the washing liquid 129 depending on the speed of rotation of the laundry drum 107 when the laundry drum 107 rotates. A first direction of rotation 135-1 of the laundry drum 107 is in the Fig. 3A shown. Through the in Fig. 3A In the illustrated rotation of the laundry drum 107, which in the present case takes place without pumping around the washing liquid 129 in the laundry care appliance 100, the laundry 127 is advantageously wetted with the washing liquid 129 heated by the heating element 120, whereby the heat from the heated washing liquid 129 is transferred to the laundry 127 is transferred, and the laundry 127 heats up advantageously, at least in the outside area.

However, it may not be possible to ensure that the heated washing liquid 129 completely wets the interior, or the core, of the laundry 127, so that the temperature of the core of the laundry 127 in this case may under certain circumstances be lower than the temperature of the in Washing liquid 129 taken up in the tub 105.

The more washing liquid 129 is used and the more efficient the heat exchange between the heated washing liquid 129 and the laundry 127, in particular the core of the laundry 127, the more efficient the laundry care process. In addition, rapid heat transfer from the heated washing liquid 129 into the laundry 127 can reduce heat loss, thereby increasing the energy efficiency of the entire laundry care process.

In the Fig. 3B a laundry drum 107 arranged in a tub 105 of a laundry care appliance 100 is shown schematically, the laundry drum 107 rotating at a high speed, in particular at an output speed. Through that compared to Fig. 3A As the laundry drum 107 rotates more quickly, the laundry 127 lies against the laundry drum 107 due to the centrifugal force acting on it, and the washing liquid 129 bound to the laundry 127 is expelled from the laundry 127 along a radial expulsion direction 137, so that the expelled washing liquid 129 collects in the space between the laundry drum 107 and the tub 105. A second direction of rotation 135-2 of the laundry drum 107, which is opposite to the first direction of rotation 135-1, is in the Fig. 3B shown.

In Fig. 4 A section of a laundry care process is shown schematically using several time curves. The abscissa axis 143 represents the time t, the first ordinate axis 141 represents the speed n of the laundry drum 107 and the second ordinate axis 142 represents the temperature T. An exemplary time course of the speed n of the laundry drum 107 during the laundry care process is shown in the first curve 138-1. The temperature value of the washing liquid 129 detected by the temperature sensor 123 is shown in the curve 138-2 and the curves 138-3 and 138-4 show an exemplary course of the temperature at two different locations within the batch of laundry during the laundry care process. Within a network phase 183, washing liquid 129 is initially supplied to the tub 105 and thus to the laundry drum 107 within a water supply phase 181, the laundry drum 107 being rotated reversibly at different speeds. After the water supply phase 181, the water supply can also be activated repeatedly in order to supply further washing liquid 129 to the tub 105.

The network phase 183 is followed by a heating phase 185, during which the supplied washing liquid 129 is heated to the limit temperature T_max 179 and the laundry 127 is heated to a target temperature T_setpoint 177, with the temperature of the washing liquid 129 increasing after the limit temperature T_max has been reached in a very short compensation process and the temperature of the laundry 127 reaches the target temperature T_soll 177. During the heating phase 185 there are several expulsion time sections 157, which are described in more detail below and each end at a time t_1 167 of the respective expulsion time section 157. In another washing process, as in Fig. 5B shown, a budding period could also end at a time t_2 169, a time t_3 171 or a time t_4 173 depending on the recorded temperature profile.

As in the Fig. 4 shown in the example shown, the temperature 138-2 and 138-3 of the laundry 127 drops while the washing liquid 129 is supplied, since the laundry is usually at room temperature at the beginning of a laundry care process and the liquid supplied to the domestic water supply is colder than room temperature, ie the supplied Washing liquid 129 cools the laundry 127. During the heating phase 185, the washing liquid 129 heats up faster than the laundry 127, as shown in curves 138-2, 138-3 and 138-4. Due to the expulsion time periods 157, the temperature of the washing liquid 129 (curve 138-2) quickly approaches the temperature of the laundry 127 (curves 138-3 and 138-4). When the washing liquid 129 reaches a limit temperature T_max 179, the heating phase 185 is ended in order to avoid overheating of the laundry 127. After completion of the heating phase 185 takes place in the illustrated For example, a further heat transfer from the washing liquid 129 to the laundry 127 takes place, with both the laundry 127, in particular in the laundry core, and the washing liquid 129 having reached the target temperature T_setpoint 177 within a short time. The laundry care process continues with a (post)washing phase.

Fig. 5A shows a schematic view of a time period of a laundry care process. In the Fig. 5A First curve 139 shown shows along the ordinate axis 141 a speed of a laundry drum 107 driven by the drum drive 109 as a function of the time, which is plotted along the abscissa axis 143.

Like from the Fig. 5A As can be seen, the laundry drum 107 is rotated at different speed levels, starting with a contact time period 145, during which the laundry drum 107 rotates at a contact speed 147, the contact speed 147 corresponding to the speed of the laundry drum 107, at which the laundry 127 picked up in the laundry drum 107 during the rotation of the laundry drum 107 is applied to the laundry drum 107 by the centrifugal force acting on the laundry 127. The system speed 147 is greater than a limit speed 150, at which a centrifugal acceleration of 1 g acts on the outer laundry items located on the jacket of the laundry drum 107.

The investment time period 145 is followed by an intermediate period 149, during which the laundry drum 107 is rotated in an intermediate speed range 151, the intermediate speed range 151 comprising a range of speeds of the laundry drum 107, which extends between the contact speed 147 and a scoop speed 153 of the laundry drum 107 . Here, the scoop speed 153 is lower than the system speed 147 and lower than the limit speed 150.

During the intermediate section 149, the laundry 127 is no longer completely in contact with the laundry drum 107, but rather the laundry 127 and the washing liquid 129 are carried along within the laundry drum 107, in particular through the projections 133 of the laundry drum 107. During the intermediate section 149, the laundry can be carried through the laundry drum 107 changing speed of the rotating laundry drum 107 a particularly dynamic movement of laundry 127 and washing liquid 129 within the laundry drum 107 can be achieved.

The interim section 149 is followed by a scooping time section 155, during which the laundry drum 107 rotates at the scooping speed 153. The scooping speed 153 is lower than the system speed 147 and also lower than the intermediate speed range 151, so that during the scooping period 155 the laundry 127 is no longer taken along or only to a small extent by the projections 133 of the laundry drum 107, so that the laundry 127 during the rotation of the laundry drum 107 remains in a lower region of the laundry drum 107. However, the projections 133 of the laundry drum 107 take part of the washing liquid 129 with them during the scooping period 155, so that the entrained washing liquid 129 can drip, in particular from above, onto the laundry 127 in the laundry drum 107, whereby an advantageous wetting of the laundry 127 is achieved.

The scooping time section 155 is again followed by an interim section 149, during which the scooping speed 153 is increased within the intermediate speed range 151 until the laundry drum 107 rotates again at the system speed 147 in the subsequent contact time section 145. The sequence of the respective in Fig. 5A Time periods 149, 145, 149, 155 shown can be repeated or varied as desired.

Like from the Fig. 5A It can also be seen that the last contact time period 145 is followed by a first drive-out time section 157-1, during which the laundry drum 107 is rotated at a first drive-out speed 159-1, which is greater than the contact speed 147. By rotating the laundry drum 107 at the first output speed 159-1, such a strong centrifugal force is exerted on the washing liquid 129 bound to the laundry 127 that the washing liquid 129 is expelled from the laundry 127 along a radial output direction 137, as in the Fig. 3B is displayed graphically.

In particular, the first output speed 159-1 is between 100 rpm and 350 rpm and a first duration of the first output period 157-1 is between 2 min and 20 min, the first output speed 159-1 and the first time period being particularly dependent on the size of the laundry drum 107, the amount of washing liquid 129 and the load amount of the laundry 127.

After the end of the first expulsion period 157-1, the speed of the laundry drum 107 is reduced, as a result of which the washing liquid 129 expelled from the laundry 127 is again absorbed by the laundry 127, and thereby wetting of the laundry 127 and a temperature transfer from the washing liquid 129 to again the laundry 127 takes place.

By rotating the laundry drum 107 at different speeds according to the in Fig. 5A The illustrated embodiment can advantageously influence the movement of the laundry 127 and the movement of the washing liquid 129 within the laundry drum 107, so that complete wetting of the laundry 127 with washing liquid 129 and also uniform heating of the laundry 127 during the laundry care process can be ensured .

In particular, according to the Fig. 5A The laundry care process described ensures advantageous wetting of the laundry 127 with a wide variety of laundry loads, in particular with different laundry load amounts, different sizes of the individual laundry items and / or different absorbency of the individual laundry items. The in Fig. 5A The laundry care process described can be repeated several times during the heating phase 185, as described in the Fig. 4 is shown as an example.

However, it can happen during the first expulsion period 157-1 that the first expulsion speed 159-1 is not reached, for example due to an imbalance occurring in the rotating laundry drum 107 due to agglomeration of laundry items in the laundry drum 107. However, it can happen during the first expulsion period 157- 1 also happen that despite reaching the first expulsion speed 159-1 during the first expulsion period 157-1, a sufficient amount of washing liquid 129 is expelled from the laundry 127, so that the desired complete wetting of the laundry 127 with washing liquid 129 during the first expulsion period 157 -1 is not reached.

In this case, complete wetting of the laundry 127, in particular complete wetting of the core of the laundry 127, with washing liquid 129 cannot be achieved be, as a result of which the laundry 127, in particular the core of the laundry 127, cannot be completely brought to the temperature required for optimal laundry care.

For this reason, in the following Fig. 5B and Fig. 6 According to an embodiment of the present disclosure, an automatic temperature-based adjustment of a laundry care process is described.

The Figure 5B shows a schematic view of a laundry care process according to an embodiment, wherein the curve 139-1 is a section of the in Fig. 5A Curve 139 shown and the dashed or dash-dotted curves 139-2, 139-3 and 139-4 show modified curves of the speed of rotation of the laundry drum 107 according to the present embodiments for automatic temperature-based adjustment of the laundry care process.

The present disclosure is based on the knowledge that the temperature of the core of the laundry 127 received in the laundry drum 107 cannot be measured directly. However, by means of a temperature sensor 123 arranged in the tub 105, the temperature of washing liquid 129 expelled from the laundry 127 can be measured, which is received as "free" washing liquid 129 in the tub 105, thereby drawing conclusions about the temperature of the core of the washing liquid in the laundry drum 107 picked up laundry 127 can be pulled in order to achieve a particularly advantageous laundry care result.

The washing liquid 129 expelled from the laundry 127 during the first expulsion period 157-1 by the rotation of the laundry drum 107 exits the laundry drum 107 through openings in the laundry drum 107 and collects on the underside of the tub 105, the temperature in the tub 105 recorded washing liquid 129 can be detected by the temperature sensor 123.

Thus, the temperature of washing liquid 129 in the tub 105 detected by the temperature sensor 123 during the in Fig. 6 shown first During the expulsion period 157-1, a direct conclusion can be drawn about the temperature of the core of the laundry 127.

In the Fig. 6 Second curve 161 shown shows different speed ranges of a rotating laundry drum 107.

Analogous to Fig. 5A reveals the in Fig. 6 second curve 161 shown shows a repeating sequence of contact time section 145, interim section 149, and scoop time section 155, in which the laundry drum 107 is rotated with the corresponding contact speed 147, in the corresponding intermediate speed range 151 or with the corresponding scoop speed 153, in order to ensure effective wetting of the to ensure the laundry 127 picked up in the laundry drum 107.

Like from the Fig. 6 As can be seen, the second curve 161 also shows a first expulsion period 157-1, during which the laundry drum 107 is rotated at a first expulsion speed 159-1 in order to apply the laundry 127 received in the laundry drum 107 to the laundry drum 107 and to the Washing liquid 129 bound to laundry 127 is at least partially expelled from laundry 127.

The ones in the Fig. 6 The third curve 163 shown shows different temperatures of washing liquid 129 in the tub 105 detected by a temperature sensor 123. Here, the third curve 163 is temporally correlated with the second curve 161.

As can be seen from the third curve 163, the controller 119 activates the heating element 120 of the laundry care appliance 100 before the first expulsion period 157-1 in order to heat the washing liquid 129 contained in the tub 105, so that, as in Fig. 6 shown, the temperature of the washing liquid 129 increases continuously before the start of the first expulsion period 157-1, as detected by the temperature sensor 123 of the laundry care device 100.

In particular, the controller 119 is designed to activate the temperature sensor 123 only depending on the activation of the heating element 120, in particular to activate the temperature sensor 123 at the same time as the heating element 120, or the controller 119 is designed in particular to only activate the temperature sensor 123 at the beginning of the first budding period 157-1 to activate, ie to activate the temperature sensor 123 in particular only when the speed of the rotating laundry drum 107 has reached the first output speed 159-1.

At the beginning of the first expulsion period 157-1, the detected temperature of the washing liquid 129 in the tub 105 reaches a local maximum 158, and then falls during the first expulsion period 157-1.

The drop in temperature during the first expulsion period 157-1 is due to the fact that at the beginning of the first expulsion period 157-1 complete wetting and heating of the core of the laundry 127 has not yet taken place, so that the temperature of the core of the laundry 127 increases The beginning of the first expulsion period 157-1 is lower than the temperature of the heated washing liquid 129 in the tub 105.

If, during the rotation of the laundry drum 107 at the first output speed 159-1, washing liquid 129 is subsequently expelled from the corresponding "cooler" core of the laundry 127 or is driven through the "cooler" core of the laundry 127 during the first output period 157-1, cools the correspondingly expelled cooler washing liquid 129 removes the "warmer" washing liquid 129 received in the tub 105 in the course of the first expulsion period 157-1, whereby a mixing temperature of the washing liquid 129 in the tub 105 is established, which is lower than the local maximum or a first detected temperature value T1 158 is the temperature of the washing liquid 129 at the beginning of the first expulsion period 157-1.

Thus, the temperature of the washing liquid 129 in the tub 105, measured by the temperature sensor 123, drops during the first expulsion period 157-1, as can be seen from the third curve 163.

The temperature T2 160 of the washing liquid 129 recorded at the end of the first expulsion period 157-1 and in particular the temperature difference dT_mix 175, the difference from the temperature T1 158 recorded at the beginning of the expulsion period 157-1 minus that recorded at the end of the first expulsion period 157-1 Temperature T2 160 is calculated, thus makes it possible to draw conclusions about the effectiveness of the heat transfer from the washing liquid 129 to the laundry 127 received in the laundry drum 107, in particular about the effectiveness of the temperature transfer from the washing liquid 129 to the core of the laundry 127. If the difference between the temperature T1 158 and the temperature T2 160 or the temperature difference dT_mix 175 is small, it can be concluded that the core of the laundry 127 also has approximately the temperature of the washing liquid 129, since no further heat transfer to the core of the laundry 127 takes place. It could also be that no washing liquid 129 has yet come into contact with the core of the laundry 127, which is why no heat transfer could take place. Therefore, in this case, a second expulsion period is carried out in order to advantageously ensure that the laundry core comes into contact with the washing liquid 129.

For this purpose, the controller 119 of the laundry care device 100 compares the temperature difference dT_mix 175 of the washing liquid 129 in the tub 105 recorded at the end of the first expulsion period 157-1 with a target temperature difference of the washing liquid 129 stored in the controller.

Even if this is in Fig. 6 is not shown, the controller 119 is in particular designed to detect any second temperature value T2 detected during the first expulsion period 157-1, to determine a temperature difference dT_mix 175 and to compare it with the target temperature difference of the washing liquid 129. For example, the temperature value T2 160 can also be a local minimum of the temperature recorded during the first expulsion period 157-1, which in the present case correlates with the temperature 160 at the end of the first expulsion period 157-1, but does not necessarily have to correlate. Thus, the temperatures or the temperature values T1 and T2 158 and 160 can alternatively also be compared virtually continuously, the determined temperature difference dT_mix 175 with the target temperature difference, so that if the target temperature difference is exceeded, the expulsion time section 157-1 can be ended early.

Furthermore, the controller 119 determines by additionally comparing the temperature value of the washing liquid 129 determined during the first expulsion period 157-1 with the target temperature assigned or set to the selected laundry care process T_setpoint 177 and/or limit temperature T_max 179 whether the laundry 127 has been completely heated and ends the heating phase 185 when the laundry 127 has been completely heated. The additional comparison is preferably carried out after the laundry 127 has been uniformly heated. This has the advantage that it can be ensured that essentially all items of laundry have reached the same temperature, in particular the core of the laundry 127. In this context, this state of the laundry is also understood as "complete heating" to the target temperature T_setpoint 177.

The controller 119 is in particular designed to determine the target temperature T_setpoint 177 and/or the limit temperature T_max 179 depending on at least one of the following parameters, recorded dry weight of the laundry picked up in the laundry drum 107, total amount of washing liquid 129 supplied to the tub 105, not to the Laundry 127 bound during the first expulsion period and washing liquid 129 present in the tub 105, the first expulsion speed 159-1, the geometry of the laundry drum 107 and / or the geometry of the tub 105. In particular, the target temperature T_setpoint 177 and / or the limit temperature T_max 179 must be stored in the controller 119.

If the temperature difference dT_mix 175 of the washing liquid 129 detected by the temperature sensor 123 during the first expulsion period 157-1 is greater than or equal to the target temperature difference of the washing liquid 129, the controller 119 determines and initiates sufficient heat exchange between the entire laundry 127 and the washing liquid 129 after the end of the first budding period 157-1, there is no second budding period 157-2, as is the case, for example, in the Fig. 6 is shown. This is followed by a further additional comparison of the temperature value recorded during the expulsion period 157-1, such as the temperature values T1 158 and/or T2 160, of the washing liquid 129 with the limit temperature T_max 179, and if the limit temperature value T_max 179 is exceeded, then the heating phase becomes 185 ended, otherwise the heating phase 185 is continued and the expulsion period 157 is repeated. As it is also in the Fig. 4 is shown as an example.

In the Fig. 6 It is also shown that the first sprouting period 157-1 is only a sequence of further investment periods 145, intermediate periods 149, or scooping period 155, and after the first expulsion period 157-1 no second expulsion period 157-2 is carried out.

However, if the in Fig. 6 If, in a case not shown, the temperature difference dT_mix 175 of the washing liquid 129 determined by the temperature sensor 123 during the first expulsion period 157-1 is smaller than the target temperature difference of the washing liquid 129, the controller 119 determines that there is insufficient heat transfer between the laundry 127, the core of the laundry 127, and therefore no effective wetting or uniform heating of the entire laundry 127, and initiates an in after the end of the first expulsion period 157-1 Fig. 5B shown second sprouting period 157-2 or 157-3. Only if after the second expulsion period 157-2 or 157-3 the further temperature difference dT_mix 175 determined at the end of the second expulsion period 157-2 or 157-3 is still smaller than the target temperature difference can it be concluded that the laundry 127 is being heated uniformly .

During the corresponding in Fig. 5B shown following the first expulsion period 157-1, the control 119 activates the drum drive 109 to rotate the laundry drum 107 with a second expulsion speed 159-2 in order to transfer the laundry 127 picked up in the laundry drum 107 to the laundry drum 107 even more to create and at least partially expel further washing liquid 129 bound to the laundry 127 from the laundry 127.

If after the first expulsion period 157-1 there has not been sufficiently effective wetting or uniform heating of the entire laundry 127, this should be made up for during the second expulsion period 157-2 or 157-3.

It is possible, in particular, for the second expulsion period 157-2 or 157-3 to be identical to the first expulsion period 157-1, that is, in particular, for the second period and/or second expulsion speed 159-2 of the second expulsion period 157-2 or 157-3 to be identical to a corresponding first time period and/or first output speed 159-1 of the first output time period 157-1. In the Fig. 5B Curve 139-2 shows an example of a second output time period 157-2, in which the second output speed 159-2 increases compared to the first output speed 159-1 and the Duration is shortened, and with curve 139-3 a second alternative output period 157-3 is shown as an example, in which the second output speed 159-3 is identical to the first output speed 159-1 and the time period is extended.

In particular, however, it is also possible for the controller 119 to control the second period of time of the second expulsion period 157-3 during the second expulsion period 157-3 following the first expulsion period 157-1, depending on the duration of the second expulsion period 157-3 during the first and/or second expulsion period 157- 1, 157-3 detected temperature or determined temperature difference dT_mix 175 of washing liquid 129 in the tub 105 changed, in particular the second time period increased compared to a first time period of the first expulsion period 157-1.

However, it is particularly alternatively or additionally possible for the controller 119 to set the second output speed 159-2 during the second output time period 157-2 following the first output time period 157-1, depending on the speed during the first and/or second output time period 157-2. 1, 157-2 detected temperature or determined temperature difference dT_mix 175 of washing liquid 129 in the tub 105 changed, in particular the second expulsion speed 159-2 increased compared to the first expulsion speed 159-1 of the first expulsion period 157-1.

As a final criterion for ending the second expulsion period 157-2, 157-3, the controller 119 can in particular specify that a predetermined second period of time of the second expulsion period 157-2, 157-3 has elapsed, in particular regardless of whether the temperature difference dT_mix 175 of Washing liquid 129 in the tub 105 is smaller or larger than the target temperature difference after the predetermined second time period.

However, the controller 119 can also in particular end the second expulsion period 157-2, 157-3 immediately, in particular before the end of the predetermined second time period of the second expulsion period 157-2, if the temperature difference determined by the temperature sensor 123 during the second expulsion period 157-2 dT_mix 175 reaches or exceeds the target temperature difference.

During the corresponding in Fig. 5B In the second expulsion period 157-2 or 157-3 shown, the controller 119 also detects the temperature of the washing liquid 129 in the tub 105 through the temperature sensor 123 and compares the corresponding temperature of the washing liquid 129 recorded during the second expulsion period 157-2 with the limit temperature T_max 179.

If the temperature of the washing liquid 129 detected during the second expulsion period 157-2 or 157-3 is now greater than or equal to the limit temperature T_max 179, the controller 119 does not initiate a further expulsion period 157 after the end of the second expulsion period 157-2 or 157-3, since it is assumed that after the second expulsion period 157-2 or 157-3 an effective wetting and heating to the target temperature T_setpoint 177 of the core of the laundry 127 has essentially taken place. The controller 119 ends the heating phase 185.

If the temperature of the washing liquid 129 detected during the second expulsion period 157-2 or 157-3 is still smaller than the limit temperature T_max 179, the second expulsion period 157-2 or 157-3 is continued until the expiry of the second expulsion period 157-2 or 157-3 continued and ended at time t_2 169 or t_3 171 and repeated the previously described sprouting time periods 157.

The controller 119 can repeat the respective further expulsion period 157 until the temperature of washing liquid 129 recorded during the respective further expulsion period 157 is greater than or equal to the limit temperature T_max 179.

The detection of the temperature of the washing liquid 129, the comparison with the limit temperature T_max 179 and the termination of the heating phase 185 when the limit temperature T_max 179 is reached or exceeded can also take place during the entire heating phase 185.

However, the further in Fig. 5B In the case shown by curve 139-4, the first or second output speed 159-1, 159-2, or 159-3 is not reached due to the occurrence of an imbalance in the laundry drum 107.

So that in this case the controller 119 is actually able to adjust the output speed 159-1, 159-2, 159-3 to the first or second output speed 159- during the corresponding output time period 157-1, 157-2, 157-3. 1, 159-2, or 159-3, there must be no imbalance in the rotating laundry drum 107 in order to prevent damage to the laundry drum 107. A corresponding imbalance can occur, for example, due to agglomeration of laundry 127 in the rotating laundry drum 107.

For this reason, the laundry care device 100 in particular has an unbalance sensor, which is designed to detect an unbalance of the rotating laundry drum 107. The unbalance sensor includes in particular a power detection element for detecting an electrical power value of the drum drive 109 of the laundry drum 107, a device for detecting a deflection or acceleration of a vibration system of the laundry drum 107 and/or a 3D sensor for detecting a deflection of the laundry drum 107 in all three spatial directions.

The controller 119 is in particular designed to increase the speed of the laundry drum 107 only to a reduced further output speed 159-3 during the first and / or second drive-out period 157-1, 157-2 or 157-3 if the unbalance sensor detects an imbalance in the rotating Laundry drum 107 detected.

At the same time, it is in particular possible that if the unbalance sensor detects an unbalance of the rotating laundry drum 107, the controller 119 increases the first and/or second duration of the first and/or second expulsion time segment 157-1, 157-2 or 157-3, so that effective heating of the entire laundry 127 can be ensured despite the reduced second or further output speed 159-2 or 159-3.

Fig. 7 shows a schematic representation of a method for caring for laundry in a laundry care device according to one embodiment.

The method 200 includes, as a first method step, the activation 201 of the heating element 120 by the controller 119 in order to heat the washing liquid contained in the tub 105.

The method 200 includes, as a second method step, the activation 203 of the drum drive 109 for rotating the laundry drum 107 at a first output speed 159-1 by the controller 119 during a first output time period 157-1 in order to deliver the laundry 127 picked up in the laundry drum 107 to the laundry drum 107 to create and at least partially expel the washing liquid 129 bound to the laundry 127 from the laundry 127.

The method 200 includes, as a third method step, the activation 205 of the temperature sensor 123 by the controller 119 during the first expulsion period 157-1 in order to detect a temperature of washing liquid 129 in the tub 105 during the first expulsion period 157-1.

The method 200 includes, as further method steps not shown, the detection of a first temperature value T1 158 and at least a second temperature value T2 160 of the washing liquid 129 supplied in the tub 105 and the determination of a temperature difference dT_mix 175, which consists of the first temperature value T1 158 minus the second temperature value T2 160 is formed.

The method 200 includes, as a first alternative fourth method step, the activation 207 of the drum drive 109 for rotating the laundry drum 107 at a second output speed 159-2 by the controller 119 during a second output time period 157-2 following the first output period 157-1, in order to Laundry 127 picked up in the laundry drum 107 is to be placed on the laundry drum 107 and the washing liquid 129 bound to the laundry 127 is to be at least partially expelled from the laundry 127 if the temperature difference dT_mix 175 of the washing liquid 129 determined by the temperature sensor 123 during the first expulsion period 157-1 is smaller as a target temperature difference of the washing liquid 129.

The second output speed 159-2 can be greater than, equal to or smaller than the first output speed 159-1 in the second output time period 157-2, 157-3 and 157-4, as already set out in the above description of the embodiments.

The method 200 includes, as a second alternative fourth method step, the non-initiation 209 of the second expulsion period 157-2 after the first expulsion period 157-1 by the controller 119 when the temperature difference dT_mix 175 determined by the temperature sensor 123 during the first expulsion period 157-1 Washing liquid 129 is greater than or equal to the target temperature value of the washing liquid 129.

All 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 simultaneously realize their advantageous effects.

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 symbol list

100

Laundry care device

101

Induction bowl

102

Device housing

103

Appliance door

105

Lye container

107

laundry drum

109

Drum drive

111

Drain opening

115

Fluid line

117

pump

118-1

Washing liquid supply device

118-2

Feed line

119

steering

120

Heating element

121

Control connection

123

Temperature sensor

125

outlet line

127

Laundry

129

Washing fluid

133

head Start

135-1

First direction of rotation

135-2

Second direction of rotation

137

Expulsion direction

138-1

First corner in Fig. 4

138-2

Second corner in Fig. 4

138-3

Third corner in Fig. 4

138-4

Fourth corner in Fig. 4

139

First corner in Fig. 5A

139-1

First corner in Fig. 5B

139-2

First curve comprising a second expulsion period

139-3

First curve comprising an alternative second budding period

139-4

First curve includes another budding period

141

first ordinate axis (speed n)

142

second ordinate axis (temperature T)

143

Abscissa axis (time t)

145

Investment period

147

System speed

149

Intermediate period

150

Limit speed

151

Intermediate speed range

153

scoop speed

155

period of creation

156-1

Washing speed in the first direction of rotation

156-2

Washing speed in the second direction of rotation

157

Budding period

157-1

First budding period

157-2

Second budding period

157-3

Alternative second budding period

157-4

Expulsion period in which the drum drive rotates at a reduced further drive speed

158

First recorded temperature value T1

159-1

First output speed

159-2

Second output speed

159-3

Reduced further output speed

160

Second recorded temperature value T2

161

Second curve

163

Third curve

165-1

Time t_0*

165-2

Time t_0

167

Time t_1

169

Time t_2

171

Time t_3

173

Time t_4

175

Temperature difference dT_mix

177

Target temperature T_setpoint

179

Limit temperature T_max

181

Water inlet phase

183

Network phase

185

Heating phase

200

Laundry care method

201

Process step: Activate the heating element

203

Process step: Activate the drum drive during the first expulsion period

205

Process step: Activate the temperature sensor during the first sprouting period

207

Process step: Activate the drum drive during the second expulsion period

209

Process step: Not initiating the second budding period

Claims (15)

Laundry care device (100) with a tub (105) for holding washing liquid (129), a laundry drum (107) for holding laundry, the laundry drum (107) being arranged in the tub (105), a drum drive (109) for rotating the laundry drum (107), a heating element (120) for heating the washing liquid (129) in the tub (105), a temperature sensor (123) which is designed to detect a temperature of washing liquid (129) in the tub (105), and a controller (119), which is connected in terms of control technology to the drum drive (109), the heating element (120) and the temperature sensor (123), characterized in that the controller (119) is designed, - activating the heating element (120) before and/or during a first expulsion period (157-1) in order to heat the washing liquid (129) contained in the tub (105), - during the first expulsion period (157-1) to activate the drum drive (109) for rotating the laundry drum (107) at a first expulsion speed (159-1) in order to deliver the laundry (127) picked up in the laundry drum (107) to the laundry drum (107) and at least partially expel the washing liquid (129) bound to the laundry (127) from the laundry (127), - during the first expulsion period (157-1) with the temperature sensor (123) to detect a first temperature value T1 (158) and at least a second temperature value T2 (160) of the washing liquid (129) supplied in the tub (105) and a temperature difference dT_mix (175), which is formed from the first temperature value T1 (158) minus the second temperature value T2 (160), - during the first budding period (1571-1) and/or at the end of the first budding period (1571-1) to compare the temperature difference dT_mix (175) with a target temperature difference and - if the temperature difference dT_mix (175) is smaller than the target temperature difference, - then during a second expulsion period (157-2) following the first expulsion period (157-1), the drum drive (109) is activated to rotate the laundry drum (107) at a second expulsion speed (159-2) in order to achieve the in the Laundry (127) picked up in the laundry drum (107) is placed on the laundry drum (107) and the washing liquid (129) bound to the laundry (127) is at least partially expelled from the laundry (127), - or otherwise not to initiate a second sprouting period (157-2, 157-3) after the first sprouting period (157-1). Laundry care device (100) according to claim 1, characterized in that the control (119) is designed to activate the drum drive (109) during the first expulsion period (157-1) in order to move the laundry drum (107) during the first expulsion period (157-1). 1) to rotate at a predetermined first output speed (159-1), and/or that the controller (119) is designed to activate the drum drive (109) during the first output period (157-1) in order to move the laundry drum (107). to rotate for a predetermined first period of time during the first expulsion period (157-1). Laundry care device (100) according to claim 1 or 2, characterized in that the control (119) is designed to control the temperature sensor (123) during the first expulsion period (157-1) as a function of the activation of the heating element (120), in particular at the same time the activation of the heating element (120). Laundry care device (100) according to claim 3, characterized in that the controller (119) is designed to activate the temperature sensor (123) during the first expulsion period (157-1) when the speed of the laundry drum (107) exceeds the first expulsion speed (159 -1) achieved. Laundry care device (100) according to one of the preceding claims, characterized in that the control (119) is designed to control the drum drive (109) during the second expulsion period (157-2, 157-3) following the first expulsion period (157-1). to activate the second output speed (159-2) of the rotating laundry drum (107) and/or a second period of time of the second expulsion period (157-2, 157-3) depending on those recorded during the first and/or second expulsion period (157-1, 157-2). To change the temperature of washing liquid (129) in the tub (105), in particular depending on the temperature difference dT_mix (175) determined during the first and / or second expulsion period (157-1, 157-2, 157-3). Laundry care device (100) according to one of the preceding claims, characterized in that the control (119) is designed to activate the drum drive (109) during the second expulsion period (157-2) in order to increase the speed of the drum with the second expulsion speed (159- 2) to increase the rotating laundry drum (107), in particular to increase it to an increased second output speed (159-2), if the temperature difference dT_mix (175) determined during and/or at the end of the first output period (157-1) is smaller than the target temperature difference is. Laundry care device (100) according to one of the preceding claims, characterized in that the control (119) is designed to activate the drum drive (109) during the second drive-out period (157-2, 157-3) in order to increase the second period of time of the rotating laundry drum (107), in particular to increase to an increased second period of time, if the temperature difference dT_mix (175) determined during and / or at the end of the first sprouting period (157-1) is smaller than the target temperature difference. Laundry care device (100) according to one of the preceding claims, characterized in that the controller (119) is designed not to initiate a further expulsion period (157) after the second expulsion period (157-2, 157-3) if one occurs during the second expulsion period (157-2, 157-3) or after the second expulsion period (157-2, 157-3) the temperature of the washing liquid (129) in the tub (105) detected by the temperature sensor (123) is greater than or equal to a limit temperature T_max ( 179) is, and
that the controller (119) is designed to activate the heating element (120) before and/or during the first expulsion period (157-1), to activate the Drum drive (109) during the first expulsion period (157-1), the determination of the temperature difference dT_mix (175) during and/or at the end of the first expulsion period (157-1), the comparison of the temperature difference dT_mix (175) with the target temperature and the Activation of the drum drive (109) must be repeated during the second expulsion period (157-2, 157-3) following the first expulsion period (157-1) if the temperature sensor (123) during the second expulsion period (157-2, 157-3) or after the second expulsion period (157-2, 157-3) the temperature of the washing liquid (129) detected is smaller than the limit temperature T_max (179) of the washing liquid (129). Laundry care device (100) according to one of the preceding claims, characterized in that the laundry care device (100) has an unbalance sensor for detecting an unbalance of the rotating laundry drum (107), the control (119) being designed during the first and/or the second Expulsion period (157-4) to activate the drum drive (109) in order to rotate the laundry drum (107) at a reduced further expulsion speed (159-2, 159-3) if the unbalance sensor is activated during the first and/or second expulsion period (157 -4) an imbalance of the rotating laundry drum (107) is detected. Laundry care device (100) according to one of the preceding claims, characterized in that the control (119) is designed to activate the drum drive (109) during at least one investment period (145) before or after the first expulsion period (157-1) in order to Laundry drum (107) to rotate at a system speed (147), the system speed (147) comprising a speed of the laundry drum (107) at which the laundry (127) picked up in the laundry drum (107) during the rotation of the laundry drum (107) rests on the laundry drum (107). Laundry care device (100) according to one of the preceding claims, characterized in that the control (119) is designed to activate the drum drive (109) during at least one scooping period (155) before or after the first expulsion period (157-1) in order to Laundry drum (107) to rotate at a scoop speed (153), the scoop speed (153) being a speed the laundry drum (107), in which the washing liquid (129) received in the tub (105) is at least partially moved by the laundry drum (107) and falls onto the laundry (127) received in the laundry drum (107). Laundry care device (100) according to claim 11, characterized in that the control (119) is designed to activate the drum drive (109) during at least an intermediate period (149) before or after the first expulsion period (157-1) in order to move the laundry drum ( 107) to rotate in an intermediate speed range (151), the intermediate speed range (151) comprising a range of speeds of the laundry drum (107), which extends between the system speed (147) and a scoop speed (153) of the laundry drum (107). Method (200) for caring for laundry (127) in a laundry care device (100), the laundry care device (100) having a tub (105) for holding washing liquid (129), a laundry drum (107) for holding laundry, the laundry drum (107) is arranged in the tub (105), a heating element (120) for heating the washing liquid (129) in the tub (105), a drum drive (109) for rotating the laundry drum (107), a temperature sensor (123), which is designed to detect a temperature of washing liquid (129) in the tub (105), and has a controller (119), which is connected in terms of control technology to the drum drive (109), the heating element (120) and the temperature sensor (123). , characterized in that the method (200) has the following process steps: A) activating (201) the heating element (120) by the control (119) in order to heat the washing liquid contained in the tub (105), B) Activating (203) the drum drive (109) to rotate the laundry drum (107) at a first output speed (159-1) by the controller (119) during a first output time period (157-1) in order to increase the speed in the laundry drum (107 ) to place the picked up laundry (127) on the laundry drum (107) and at least partially expel the washing liquid (129) bound to the laundry (127) from the laundry (127), C) Activation (205) of the temperature sensor (123) by the controller (119) during the first expulsion period (157-1) in order to during the first expulsion period (157-1) to detect a temperature of washing liquid (129) in the tub (105), D) detecting a first temperature value T1 (158) and at least a second temperature value T2 (160) of the washing liquid (129) supplied in the tub (105), E) determining a temperature difference dT_mix (175), which is formed from the first temperature value T1 (158) minus the second temperature value T2 (160), F) Comparing the temperature difference dT_mix (175) with a target temperature difference and if the temperature difference dT_mix (175) is smaller than the target temperature difference, then 1) Activating (207) the drum drive (109) to rotate the laundry drum (107) at a second output speed (159-2) by the controller (119) during a second output period (157) following the first output period (157-1). -2, 157-3) in order to place the laundry (127) received in the laundry drum (107) on the laundry drum (107) and at least partially expel the washing liquid (129) bound to the laundry (127) from the laundry (127). , or else 2) No activation (209) of the second expulsion period (157-2, 157-3) after the first expulsion period (157-1) by the controller (119). Method (200) according to claim 13, characterized in that the method (200) involves changing the second output speed (159-2) of the rotating laundry drum (107) during the second output period (157-2) and/or changing a second period of time of the second expulsion period (157-3) depending on the temperature of washing liquid (129) in the tub (105) recorded during the first and / or second expulsion period (157-1, 157-2, 157-3), in particular depending on the temperature difference dT_mix (175) determined during the first and/or second sprouting period (157-1, 157-2, 157-3). Method (200) according to claim 13 or 14, characterized in that the steps of the method are repeated if the temperature detected by the temperature sensor (123) during the second expulsion period (157-2) of Washing liquid (129) is smaller than the limit temperature T_max (179) of the washing liquid (129), and
in that the method includes not initiating (211) a further expulsion period (157-3) after the second expulsion period (157-2) by the controller (119) if the temperature sensor (123) during the second expulsion period (157- 2) detected temperature of the washing liquid (129) is equal to or greater than the limit temperature T_max (179) of the washing liquid (129).

Images