DE102017219042A1 - Laundry care device with a controller - Google Patents

Abstract

The present invention relates to a laundry care device (100) with a washing tub (105) for receiving washing liquid, the washing tub (105) having a drain opening (111) and an inlet opening (113) fluidly connected by a liquid line (115), a washing drum (107) for receiving laundry, a drum drive (123) for rotating the laundry drum (107), a temperature sensor for detecting a temperature of washing liquid in the tub (105), a heating element for heating the washing liquid, a pump (117) which is adapted to pump washing liquid through the discharge opening (111) in the liquid line (115) and the pumped washing liquid through the inlet opening (13) again the liquor tank (105) to wet the laundry in the laundry drum (107), and a controller (119) for controlling the pump (117), the drum drive (123) and the heating element nd a washing process (144). The controller (119) is configured to activate the heating element during a heating phase (145) of the washing process (144) until the sensed temperature of the washing liquid in the tub (105) reaches a target temperature value (146). The controller (119) is configured to activate the drum drive (123) during a mixing phase (147) of the washing process (144) following the heating phase (145) in order to rotate the laundry drum (107) and the pump (117). to activate to circulate the washing liquid and to wet the laundry accommodated in the laundry drum (107) with the heated recirculated washing liquid, wherein the controller (119) is configured to establish a first temperature value at the beginning of a reference period (153) of the mixing phase (147) determining, at the end of the reference period (153) of the mixing phase (147), a second temperature value, wherein the controller (119) is configured to terminate the mixing phase (147) if the temperature difference between the first temperature value and the second temperature value falls below a temperature threshold, to ensure a uniform temperature distribution in the washing liquid and in the laundry rzustellen.

Description

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

In a laundry care device, washing liquid is heated in a tub of the laundry care device by a heating element so that the heated washing liquid of the laundry in the laundry drum is available for a washing process in order to achieve an effective laundry care success. Since the laundry in the laundry drum generally has a lower temperature than the heated washing liquid in the tub of the laundry care appliance, the heating element must often heat the washing liquid to a temperature which is above a desired laundry core temperature of the laundry to ensure that the laundry is sufficient is heated. In the case of particularly delicate textiles, under certain circumstances damage to the laundry may occur.

In the EP 2 161 365 B1 discloses a method for operating a washing machine, wherein the method comprises a washing phase with the radiator switched on to heat the washing liquid and activated Umfluteinrichtung that promotes the washing liquid from the lower portion of the tub in the upper area, based on the operational installation position of the washing machine.

It is the object underlying the invention to provide a laundry care device in which a uniform heating of laundry is ensured in a laundry care device.

This object 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.

According to a first aspect, the object according to the invention is achieved by a laundry care device having a lye container for receiving washing liquid, wherein the lye container has a discharge opening and an inlet opening, which are fluidly connected by a liquid line, a laundry drum for receiving laundry, a drum drive for rotating the washing drum, a temperature sensor for detecting a temperature of washing liquid in the tub, a heating element for heating the washing liquid, a pump configured to pump washing liquid through the discharge opening into the liquid line and to supply the pumped washing liquid through the inlet opening to the tub again to wet the laundry in the laundry drum, and a controller for controlling the pump, the drum drive and the heating element during a washing process, wherein the controller is formed during a heating phase of the washing operation to activate the heating element until the detected temperature of the washing liquid in the tub reaches a target temperature value, wherein the controller is adapted to activate the drum drive during a subsequent to the heating phase mixing phase of the washing operation to rotate the laundry drum and the Activate the pump to pump over the scrubbing liquid and to wet the scrubbing received in the scrubbing drum with the heated recirculating scrubbing liquid, wherein the controller is configured to determine a first temperature value at the beginning of a reference time period of the mixing phase and a second temperature value at the end of the reference time period of the intermixing phase and wherein the controller is configured to terminate the mixing phase when the temperature difference between the first temperature value and the second temperature value falls below a temperature threshold value, u m to ensure a uniform temperature distribution in the washing liquid and in the laundry.

Thereby, the technical advantage is achieved that a uniform temperature distribution of the washing liquid is ensured in the laundry.

According to the present disclosure, in the heating phase, the laundry is heated to the target temperature and the heating element is subsequently deactivated by the controller. During the mixing phase subsequent to the heating phase, washing liquid is pumped out of the tub by the pump and fed again to the tub as part of a circulation process. During the Umpumpvorgangs the laundry drum is rotated by the drum drive, so that the introduced by the pumping process washing liquid impinges on the laundry and penetrates through the caused by the rotation of the laundry drum centrifugal force the laundry while effectively wetting. Thereby, an effective heat transfer is ensured by the heated washing liquid to the laundry, so that the laundry heats evenly, and at the same time the heated washing liquid cools slightly.

The aim of the uniform heating of the laundry is to obtain as small a temperature difference between the temperature of the laundry and the temperature of the washing liquid at the end of the mixing phase.

For this purpose, the controller determines a first temperature value at the beginning of the reference time period and at the end of the reference period, a second temperature value. The controller determines a temperature difference between the first temperature value and the second temperature value, and the controller then compares the temperature difference to a temperature threshold. Once the temperature difference is less than the temperature threshold, the controller will terminate the mixing phase because of the effective temperature balance between the wash and the wash.

The temperature threshold is chosen to be low enough to ensure that an effective temperature balance has been established between the laundry and the washing liquid in the laundry care appliance.

By a uniform heating of the laundry in the laundry drum of textile damage to the laundry can be counteracted, and caused by the heating element entry of heat into the laundry can be targeted reduced.

Furthermore, shorter washing times and advantageous hygiene requirements can be met by higher temperatures in the laundry, as well as reproducible and higher laundry care results of the laundry can be ensured during a laundry treatment program.

A laundry care appliance is understood to mean a device which is used for laundry care, such as e.g. a washing machine or a tumble dryer. In particular, such a laundry care appliance is understood as a household laundry care appliance. So a laundry care device, which is used in the context of household management, and is treated with the laundry in normal household quantities.

In an advantageous embodiment of the laundry care device, the controller is configured to end the washing process when the determined second temperature value of the washing liquid at the end of the mixing phase corresponds to the target temperature value, or is the controller configured to end the washing process when the determined second temperature value of the washing liquid on End of the mixing phase is within a variance range of the target temperature value, or the controller is adapted to terminate the washing process, when the determined temperature difference between the first temperature value and the second temperature value falls below a further temperature threshold.

As a result, the technical advantage is achieved that a uniform heating of the laundry is ensured in the laundry drum. If, at the end of the mixing phase, the second temperature value of the washing liquid corresponds to the target temperature value, the controller can assume that the laundry in the washing drum and the washing liquid in the tub are at approximately the same temperature, since the temperature of the washing liquid does not drop any further. Thus, the controller can stop the washing process.

Alternatively, the controller may terminate the washing process if the determined second temperature value of the washing liquid at the end of the mixing phase is within a variance range of the target temperature value. This ensures that the controller also terminates the washing process when the specific second temperature value is only slightly above or only slightly below the target temperature value.

Alternatively, the controller may terminate the washing process if the determined temperature difference between the first temperature value and the second temperature value falls below a further temperature threshold. Thus, the washing process can also be terminated when only a very shallow temperature gradient is determined at the end of the mixing phase and there is no further significant drop in temperature. In this case, the further temperature threshold value may have a lower differential temperature, in particular of 2 ° C., than the temperature threshold value, which may in particular have a differential temperature of 5 ° C.

In the present case, the washing process means the phase of a laundry treatment program until the temperature value of the laundry has reached a predetermined target value, wherein the temperature value of the laundry can be determined by measuring the temperature value of the washing liquid due to the effective temperature compensation between the laundry and the washing liquid. After a termination of such a washing process, a subsequent washing process can in principle follow, which preferably takes place without a further heating phase. With the Nachwaschvorgang a treatment of the laundry with the predetermined temperature value of the laundry for a predetermined treatment time can be ensured. In addition, the laundry can be further moved during the Nachwaschvorgangs by rotating the laundry drum. The treatment duration of the post-washing process may preferably be determined or determined as a function of the duration of the preceding washing process, a determined quantity of laundry and / or type of laundry and / or a selected laundry treatment program. With the Nachwaschphase can advantageous the laundry care success and the hygiene requirements are additionally ensured.

In an advantageous embodiment of the laundry care device, the controller is configured to deactivate the pump and the drum drive during a collection phase of the washing process subsequent to the mixing phase in order to collect washing liquid in the tub when the determined second temperature value of the washing liquid at the end of the mixing phase is not Target temperature value corresponds or when the determined second temperature value of the washing liquid at the end of the mixing phase is not within a variance range of the target temperature value or if the determined temperature difference between the first temperature value and the second temperature value does not fall below the further temperature threshold.

Thereby, the technical advantage is achieved that the collection phase ensures that collects by disabling the pump and the drum drive, the washing liquid to a bottom of the tub. If the determined second temperature value of the scrubbing liquid at the end of the mixing phase does not correspond to the target temperature value, or if the determined second temperature value of the scrubbing liquid is not within a variance range of the target temperature value at the end of the mixing phase, or if the determined temperature difference between the first temperature value and the second temperature value is not If the temperature falls below the further temperature threshold, the controller can not end the washing process, since the laundry has not yet been completely heated by the washing liquid. But the controller must activate another heating phase of the heating element in the context of another washing process. By the collected during the collection phase in the tub washing liquid can be ensured that the heating element does not run dry in the subsequent further heating phase of the further washing process.

In an advantageous embodiment of the laundry care device, the controller is configured to start a further washing process of the laundry care device after the mixing phase or after the collection phase if the determined second temperature value of the washing liquid at the end of the mixing phase does not correspond to the target temperature value or is not within a variance range of the target temperature value or if the determined temperature difference between the first temperature value and the second temperature value does not fall below the further temperature threshold, the controller being configured to activate the heating element during a further heating phase of the further washing operation until the detected temperature of the washing liquid in the tub reaches a target temperature value the controller is designed, during a subsequent subsequent mixing phase of the further heating phase of the further washing process the Trommelantri eb to rotate the laundry drum and activate the pump to pump over the wash liquid and to wet the laundry received in the laundry drum with the heated recirculated wash liquid, the controller being configured to establish a first temperature value at the beginning of a reference time period of the further mixing phase and at the end of the reference period of the further mixing phase, determining a second temperature value, and wherein the controller is configured to terminate the further mixing phase when the temperature difference between the first temperature value and the second temperature value falls below a temperature threshold, to obtain a uniform temperature distribution in the washing liquid and to ensure in the wash.

Thereby, the technical advantage is achieved that the control ensures that the washing process is not terminated when the certain second temperature value of the washing liquid at the end of the mixing phase does not meet the target temperature value, or if the temperature gradient is not flat enough, because then the laundry was not completely heated by the washing liquid. In this case, the controller starts another washing process. During the further heating phase of the further washing process, the heating element heats the washing liquid again to the target temperature value. During the further mixing phase subsequent to the further heating phase, the controller again activates the drum drive to rotate the laundry drum and re-activates the control to pump the washing liquid out of the tub and pump the heated pumped washing liquid back into the tub. Subsequently, the first and second temperature values and the temperature difference between the first and second temperature values are again determined. If the determined second temperature value of the washing liquid at the end of the further mixing phase corresponds to the target temperature value, or if the temperature gradient is sufficiently flat, the control ends the further washing process. If this is not the case, the controller repeats the further laundry operations until the determined second temperature value of the washing liquid at the end of the corresponding further mixing phase corresponds to the target temperature value or until the temperature gradient runs sufficiently flat.

In an advantageous embodiment of the laundry care appliance, the laundry care appliance has a filling level sensor which is designed to detect a level of washing liquid in the washing tub, and the laundry care appliance has a washing liquid feeding device for feeding washing liquid into the washing liquor, the control being designed, the washing liquid feeding device to activate to supply washing liquid in the tub when the detected level of washing liquid in the tub is below a reference level.

Thereby, the technical advantage is achieved that the Waschflüssigkeitszuführeinrichtung ensures that washing liquid is supplied in a timely manner when the detected level of washing liquid in the tub below a reference level, so that a dry running of the heating element can be prevented.

In an advantageous embodiment of the laundry care device, the washing liquid supply device is fluidly connected to the suds container by a supply line, and the washing liquid supply device comprises, in particular, an induction bowl of the laundry care device.

As a result, the technical advantage is achieved that the washing liquid supply device can effectively deliver washing liquid to the tub through the supply line. If the washing liquid supply device comprises an induction bowl, then either water can be supplied to the liquor container as the washing liquid through the dispensing bowl, or it can be supplied to the liquor container as laundry liquid mixed with water.

In an advantageous embodiment of the laundry care device, the laundry care device has a level sensor which is designed to detect a level of washing liquid in the tub, wherein the controller is configured to activate the drum drive to spin-free washing liquid bound in the laundry and the spin-off washing liquid Supply liquor container, if the detected level of washing liquid in the tub below a reference level.

Thereby, the technical advantage is achieved that the spin-off washing liquid ensures that a dry running of the heating element can be prevented when the detected level of washing liquid in the tub is below a reference level.

In an advantageous embodiment of the laundry care device, the controller is designed to activate the drum drive during the mixing phase, in order to rotate the laundry drum at least in sections at an investment rotational speed during the mixing phase and to bring the laundry into contact with the laundry drum.

Thereby, the technical advantage is achieved that can be ensured by the rotation of the laundry drum with the Anlagerotationsgeschwindigkeit that the laundry effectively applies to the laundry drum and thereby a laundry channel is formed in the laundry drum. By pump pumped washing liquid can be introduced particularly advantageous in the laundry channel to wet the laundry advantageous.

In an advantageous embodiment of the laundry care device, the controller is designed to activate the drum drive during the mixing phase in order to rotate the laundry drum at least in sections at a reversing rotation speed, in particular in a reversing rotation direction oppositely directed to the main rotation direction of the laundry drum during the mixing phase.

As a result, the technical advantage is achieved that a particularly effective wetting of the laundry is ensured by the rotation of the laundry drum with a reversing, which is in particular lower than the Anlagerotationsgeschwindigkeit. If the laundry drum is rotated in the direction opposite to the main direction of rotation of the laundry drum Reversierrotationsrichtung, an effective turning of the laundry is achieved in the laundry drum and it can be ensured that the laundry is wetted evenly.

In an advantageous embodiment of the laundry care device, the controller is designed to rotate the laundry drum during the reference time section with the reversing rotation speed and / or in the reversing rotation direction.

Thereby, the technical advantage is achieved that during the reference period, a uniform distribution of the laundry in the laundry drum is ensured, whereby a particularly accurate determination of the first temperature value and the second temperature value can be ensured.

In an advantageous embodiment of the laundry care appliance, the laundry care appliance has a fill level sensor, which is designed to fill the wash liquor in the washing machine To detect tub, and the controller is configured during the heating phase to activate the heating element when the detected level of washing liquid in the tub exceeds a reference level.

Thereby, the technical advantage is achieved, that ensures that the heating element is not activated, if not enough washing liquid is present in the tub.

According to a second aspect, the object according to the invention is achieved by a method for maintaining laundry in a laundry care device, wherein the laundry care device has a lye container for receiving washing liquid, wherein the lye container has a drain opening and an inlet opening, which are fluidly connected by a liquid line, wherein the laundry-care apparatus comprises a laundry drum for receiving laundry, a drum drive for rotating the laundry drum, a temperature sensor for detecting a temperature of washing liquid in the tub, a heating element for heating the washing liquid, a pump which is adapted to pump washing liquid through the discharge opening into the liquid line and re-supplying the pumped washing liquid through the inlet port to the tub to wet the laundry in the laundry drum, and a controller for controlling the pump, the drum operation and the heating element during a washing operation, the method comprising the steps of activating the heating element during a heating phase of the washing operation by the controller until the detected temperature of the washing liquid in the tub reaches a target temperature value, activating the drum drive to the laundry drum to during a phase of mixing subsequent to the heating phase by the controller to wet the laundry received in the laundry drum with the heated recirculated washing liquid, determining a first temperature value at the beginning of a reference period of the mixing phase and a second temperature value at the end of a reference time period of the mixing phase by the controller, and terminating the mixing phase by the controller when the temperature difference between the first temperature value and the second T emperaturwert falls below a temperature threshold to ensure a uniform temperature distribution in the washing liquid and in the laundry.

As a result, the technical advantage is achieved that a particularly uniform heating of the laundry and the washing liquid is ensured by the method.

In an advantageous embodiment of the method, the method comprises the step of terminating the washing operation by the controller when the determined second temperature value of the washing liquid at the end of the mixing phase corresponds to the target temperature value or if the determined second temperature value of the washing liquid is within a variance range at the end of the mixing phase of the target temperature value, or if the determined temperature difference between the first temperature value and the second temperature value falls below a further temperature threshold value.

As a result, the technical advantage is achieved that after reaching the target temperature, or at a shallow temperature gradient, the washing process can be stopped.

In an advantageous embodiment of the method, the method comprises the following step, deactivating the pump and the drum drive during a collection phase of the washing operation subsequent to the mixing phase by the controller to collect washing liquid in the tub when the determined second temperature value of the washing liquid at the end the mixing phase does not correspond to the target temperature value, or if the determined second temperature value of the washing liquid is not within a variance range of the target temperature value at the end of the mixing phase or if the determined temperature difference between the first temperature value and the second temperature value does not fall below a further temperature threshold value.

This achieves the technical advantage that the collection phase ensures that the heating element does not run dry when further heating phases follow the mixing phase.

In an advantageous embodiment of the method, the method comprises the following step, starting a further washing operation of the laundry care device after the mixing phase or after the collection phase by the controller, if the determined second temperature value of the washing liquid at the end of the mixing phase does not correspond to the target temperature value or not within a variance range the target temperature value is or if the determined temperature difference between the first temperature value and the second temperature value does not fall below a further temperature threshold, wherein the further washing process, a further heating phase and a includes further mixing phase subsequent to the further heating phase.

As a result, the technical advantage is achieved that the further washing operations can be repeated until the detected temperature of the washing liquid reaches the target temperature value.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

• 1 eine schematische Ansicht eines Wäschepflegegeräts;
• 2 eine schematische Ansicht eines Wäschepflegegeräts mit einer Steuerung;
• 3 eine graphische Darstellung eines Abschnitts eines Wäschebehandlungsprogramms gemäß einer ersten Ausführungsform;
• 4 eine graphische Darstellung eines Abschnitts eines Wäschebehandlungsprogramms gemäß einer zweiten Ausführungsform;
• 5 eine graphische Darstellung eines Abschnitts eines Wäschebehandlungsprogramms gemäß einer dritten Ausführungsform; und
• 6 eine schematische Darstellung eines Verfahrens zum Pflegen von Wäsche in einem Wäschepflegegerät.

Show it:

• 1 a schematic view of a laundry care device;
• 2 a schematic view of a laundry care device with a controller;
• 3 a graphical representation of a portion of a laundry treatment program according to a first embodiment;
• 4 a graphical representation of a portion of a laundry treatment program according to a second embodiment;
• 5 a graphical representation of a portion of a laundry treatment program according to a third embodiment; and
• 6 a schematic representation of a method for maintaining laundry in a laundry care device.

1 shows a schematic view of a general laundry care device 100 , such as a washing machine. The laundry care device 100 includes an induction bowl 101 , in which detergents or other liquid substances can be filled. The laundry care device 100 includes a door 103 for loading the laundry care device 100 with laundry.

2 shows a schematic view of a laundry care device with a controller. The laundry care device 100 has a tub 105 for receiving washing liquid, and has a laundry drum 107 for receiving laundry. The laundry drum 107 has a drum base 109 on. The tub 105 has a drain opening 111 on. The laundry care device 100 has an inlet opening 113 on. The drain opening 111 is through a fluid line 115 with the inlet opening 113 fluidly connected, wherein in the fluid line 115 a pump 117 for pumping washing liquid through the liquid line 115 is arranged. The pump 117 can wash fluid through the drain opening 111 from the tub 105 during a in 2 Pumping process not shown in the liquid line 115 pump out and the pumped washing liquid through the liquid line 115 and through the inlet opening 113 the tub 105 and the laundry drum 107 feed again. Thereby, the fresh washing liquid during a laundry care process effectively through the liquid line 115 be pumped and the laundry in the laundry drum 107 be fed again.

The laundry care device 100 further includes a controller 119 which with the pump 117 through a first control connection 121 connected, and which with a drum drive 123 through a second control connection 125 connected is.

The control 119 is formed, the pump speed of the pump 117 depending on the detected electrical power value of the pump 117 to control.

The laundry care device 100 further comprises an outlet conduit 127 , which with the liquid line 115 fluidly connected. The pump 117 is trained during a in 2 Not shown Abpumpvorgangs washing liquid through the discharge opening 111 from the tub 105 , through the fluid line 115 and through the outlet pipe 127 from the laundry care device 100 pump out.

Even if this is in 2 not shown, is the controller 119 with a temperature sensor for detecting a temperature of washing liquid in the tub 105 a heating element for heating the washing liquid in the tub 105 , and a level sensor for detecting a level of washing liquid in the tub 105 connected.

3 shows a graphical representation of a portion of a laundry treatment program according to a first embodiment. 3 shows a time diagram of a rotational speed of a laundry drum 107 , a temperature of washing liquid in the tub 105 , the level of washing liquid in the tub 105 , an activation state or deactivation state of the pump 117 , and the tub 105 supplied washing liquid amount, all along the ordinate axis 131 depending on the time in seconds, which along the abscissa axis 133 is given, are applied.

The first turn 135 shows the course of the rotational speed of the laundry drum 107 , The second turn 137 shows the course of the temperature of washing liquid in the tub 105 , The third turn 139 shows the level of washing liquid in the tub 105 , The fourth Curve 141 shows the activation state or deactivation state of the pump 117 , The fifth bend 143 shows the tub 105 supplied washing liquid quantity.

Along the abscissa axis 133 is one in the laundry care device 100 carried out washing process 144 shown.

During a heating phase 145 the washing process 144 is in the tub 105 a sufficient amount of washing liquid, thereby ensuring that in the tub 105 arranged heating element is completely surrounded by washing liquid and thus there is no damage due to dry running of the heating element.

The control 119 activated during the heating phase 145 the heating element until the temperature of the washing liquid in the tub 105 a target temperature value 146 reached. Typically, the target temperature value 146 chosen by the customer, or by the laundry treatment program so that when reaching the target temperature value 146 no temperature-related textile damage due to locally overheated laundry is to be feared.

As in the first corner 135 is shown, the drum drive rotates 123 the laundry drum 107 during the heating phase 145 ,

During a on the heating phase 145 subsequent mixing phase 147 the washing process 144 activates the control 119 the drum drive 123 to the laundry drum 107 with an investment rotational speed 148 to rotate, causing the laundry with the laundry drum 107 is brought into contact.

At the same time the controller activates 119 during the mixing phase 147 the pump 117 to circulate washing liquid and the pumped washing liquid of the laundry in the laundry drum 107 supply. Like in the 3 is shown by the pump 117 Pumped pumped liquid here a Umpumpaktivität 149 on. Thereby, the heated by the heating element washing liquid of the laundry in the laundry drum 107 supplied and by the Anlagerotationsgeschwindigkeit 148 the supplied washing liquid again thrown out of the laundry. As in the third turn 139 is shown, which accumulates during the mixing phase 147 ejected washing liquid in the tub 105 , so that is a drum level 151 of washing liquid in the tub 105 established.

During the mixing phase 147 must the drum drive 123 the laundry drum 107 not necessarily with the investment rotation speed 148 rotate but can the laundry drum 107 also rotate at a slower rotation speed.

It is possible that the drum drive 123 the laundry drum 107 during the mixing phase 147 at least partially reversing rotated, in which case the Reversierrotationsrichtung opposite to a main direction of rotation of the laundry drum 107 during the mixing phase 147 is directed, and being the laundry drum 107 is rotated in particular with a Reversierrotationsgeschwindigkeit.

During the mixing phase 147 transfers the heated washing liquid a portion of your heat to the laundry, so that it comes to an effective temperature compensation between washing liquid and laundry. The fact that the cooler laundry absorbs heat from the heated washing liquid, the washing liquid is in the tub 105 slightly cooled, so as in the first turn 135 is shown, the temperature of the washing liquid during the mixing phase 147 slightly lower, and thus below the target temperature value 146 located.

At the end of the mixing phase 147 determines the control 119 a first temperature value at the beginning of a reference time period 153 and determines the controller 119 a second temperature value at the end of the reference time period 153 , Connecting determines the controller 119 the temperature difference between the first temperature value and the second temperature value. The control 119 ends the mixing phase 147 when the temperature difference between the first temperature value and the second temperature value falls below a temperature threshold value. The temperature threshold is chosen to be so low that it is ensured that a temperature difference which is below the temperature threshold indicates that an effective heat exchange between the laundry and the washing liquid has taken place and thus a sufficiently flat temperature gradient exists.

Because in the 3 the second temperature value at the end of the mixing phase 147 not the target temperature value 146 corresponds, but is lower, the controller starts 119 a to the mixing phase 147 subsequent collection phase 155 , During the collection phase 155 disables the controller 119 the pump 117 and the drum drive 123 to the recirculated washing liquid in the tub 105 to collect. This will ensure that a sufficient high level of washing liquid at the bottom of the tub 105 is present, so that heating element and temperature sensor are effectively covered with the washing liquid as soon as the washing liquid is reheated.

If the amount of washing liquid in the tub 105 should not be sufficient to effectively cover the heating element and the temperature sensor, the controller 119 the drum drive 123 re-activate to spin wash liquid out of the wash, or a wash liquid feeder can be activated to re-wash wash liquor 105 supply.

For this purpose, the laundry care device has a in 3 Level sensor, not shown, which is formed, a level of washing liquid in the tub 105 to detect, and the laundry care device has a Waschflüssigkeitszuführeinrichtung for supplying washing liquid into the tub 105 having. As in the fifth turn 143 is shown, activates the controller 119 the washing liquid supply at a feeding time 157 when the detected level of washing liquid in the tub 105 a reference level value 159 falls below, so that washing liquid can be supplied until the detected level of washing liquid in the tub 105 the reference level value 159 again exceeds.

After the collection phase 155 has been carried out, the laundry care device starts 100 another wash 144 - 2 , wherein the further washing process 144 - 2 another heating phase 145 - 2 includes while the the controller 119 the heating element is reactivated, whereby during the further heating phase 145 - 2 the detected temperature of the washing liquid the target temperature value 146 equivalent.

The control 119 is formed, the washing process 144 to stop when the detected temperature of the washing liquid in the tub 105 after the further washing process 144 - 2 the target temperature value 146 reached.

4 shows a graphical representation of a portion of a laundry treatment program according to a second embodiment. With regard to the curves shown 135 . 137 . 139 . 141 and 143 will be on the 3 directed. As in the fifth turn 143 is shown, activates the controller 119 the washing liquid supply at a feeding time 157 when the detected level of washing liquid in the tub 105 a reference level value 159 below.

The heating phase 145 and the mixing phase 147 the washing process 144 correspond to the corresponding phases 145 . 147 of in 3 illustrated washing process 144 , In this case, however, the temperature of the washing liquid detected by the temperature sensor falls below the target temperature value 146 at the end of the mixing phase 147 , Because of this, the controller performs 119 a collection phase 155 through to washing liquid in the tub 105 to collect, and leads the controller 119 then further washing 144 - 2 through, with the further washes 144 - 2 further heating phases 145 - 2 and further mixing phases 147 - 2 include. At the end of the last mixing phase 147 - 2 the last further wash 144 - 2 the detected temperature is within a variance range of the target temperature value 146 and the controller 119 stops the washing process 144 . 144 - 2 ,

5 shows a graphical representation of a laundry care operation according to a second embodiment. With regard to the curves shown 135 . 137 . 139 . 141 and 143 will be on the 3 directed.

In the 5 is a variety of other washes 144 - 2 only shown in sections. In this case, each of the further washing processes 144 - 2 a corresponding further heating phase 145 - 2 and a corresponding further mixing phase 147 - 2 , Between the respective washing processes 144 - 2 will be during each collection phase 155 Washing liquid in the tub 105 collected. For details of the temperature determination of the washing liquid by the controller 119 will comment on the finishes in 3 and 4 directed. As in the fifth turn 143 is shown, activates the controller 119 the washing liquid supply at a feeding time 157 when the detected level of washing liquid in the tub 105 a reference level value 159 below.

During the respective reference periods 153 the respective mixing phases 147 - 2 determines the control 119 at the beginning of the respective reference period 153 a first temperature value and at the end of the respective reference period 153 a second temperature value.

At the end of each mixing phase 147 - 2 compares the controller 119 the temperature difference between the first temperature value and the second temperature value and determines the respective temperature difference between the respective first temperature value and the respective second temperature value.

The criterion for the control 119 the respective further washing process 144 - 2 abort is when the respective determined temperature difference falls below a temperature threshold.

In the two temporally first reference periods 153 is the one through the controller 119 certain temperature difference too big, than that the control 119 can break off, ie the temperature gradient is flat enough. Only in the last reference period 153 a small temperature difference is detected, which falls below the temperature threshold, so that the temperature gradient is sufficiently flat for a termination.

Thus the control ends 119 the further washes 144 - 2 after the last reference period 153 and it closes no further washing 144 - 2 on.

6 shows a schematic representation of a method for maintaining laundry in a laundry care device.

The procedure 200 comprises activation as the first method step 201 of the heating element during a heating phase 145 the washing process 144 through the controller 119 until the detected temperature of the washing liquid in the tub 105 a target temperature value 146 reached.

The procedure 200 includes activating as a second method step 203 of the drum drive 123 to the laundry drum 107 to rotate, and the pump 117 to pump the washing liquid during a heating phase 145 subsequent mixing phase 147 through the controller 119 to put in the laundry drum 107 To wet the recorded laundry with the heated pumped wash liquid.

The procedure 200 includes determining as the third method step 205 a first temperature value at the beginning of a reference time period 153 the mixing phase 147 and a second temperature value at the end of a reference time period 153 the mixing phase 147 ,

The procedure 200 comprises as the fourth process step the termination 207 the mixing phase 147 through the controller 119 when the temperature difference between the first temperature value and the second temperature value falls below a temperature threshold to ensure a uniform temperature distribution in the washing liquid and in the laundry.

The procedure 200 includes finishing as an optional fifth step 209 the washing process 144 through the controller 119 when the particular second temperature value of the washing liquid at the end of the mixing phase 147 the target temperature value 146 corresponds to, or if the certain second temperature value of the washing liquid at the end of the mixing phase 147 within a variance range of the target temperature value 146 is, or if the determined temperature difference between the first temperature value and the second temperature value falls below a further temperature threshold.

The procedure 200 includes deactivation as an alternative optional sixth method step 211 the pump 117 and the drum drive 123 during one to the mixing phase 147 subsequent collection phase 155 the washing process 144 through the controller 119 to wash liquid in the tub 105 when the determined second temperature value of the washing liquid at the end of the mixing phase 147 not the target temperature value 146 corresponds to, or if the certain second temperature value of the washing liquid at the end of the mixing phase 147 not within a variance range of the target temperature value 146 is, or if the determined temperature difference between the first temperature value and the second temperature value does not fall below a further temperature threshold.

The procedure 200 includes starting as an alternative optional seventh process step 213 another washing process 144 - 2 of the laundry care device 100 after the mixing phase 147 or after the collection phase 155 when the particular second temperature value of the washing liquid at the end of the mixing phase 147 not the target temperature value 146 equal or not within a variance range of the target temperature value 146 or if the determined temperature difference between the first temperature value and the second temperature value does not fall below a further temperature threshold value, wherein the further washing process 144 - 2 another heating phase 145 - 2 and a to the further heating phase 145 - 2 subsequent further mixing phase 147 includes.

The process step 213 can in an alternative, not shown embodiment also by repeating the steps 201 to 207 be formed. wherein the repetition of reaching a predetermined time period or the step 209 can be stopped.

After finishing a wash 144 or 144 - 2 can follow a post-washing process, in which the laundry drum 109 analogous to the rotation of the laundry drum 109 in the washing process 144 or 144 - 02 can be rotated. In the post-wash cycle in particular no further heating phase is provided more.

All of the features explained and shown in connection with individual embodiments of the invention may be provided in different combinations in the article according to the invention in order to simultaneously realize their advantageous effects.

The scope of the present invention is given by the claims and is not limited by the features illustrated in the specification or shown in the figures.

LIST OF REFERENCE NUMBERS

100

Laundry care device

101

dispenser tray

103

door

105

tub

107

washing drum

109

Drum base

111

drain hole

113

inlet port

115

liquid line

117

pump

119

control

121

First control connection

123

drum drive

125

Second control connection

127

outlet pipe

131

axis of ordinates

133

abscissa

135

First turn

137

Second turn

139

Third turn

141

Fourth bend

143

Fifth bend

144

wash

144-2

Further washing process

145

heating phase

145-2

Further heating phase

146

Target temperature value

147

Mixing phase

147-2

Further mixing phase

148

Conditioning rotational speed

149

Umpumpaktivität

151

drum level

153

Reference period

155

collection phase

157

Nachfüllzeitpunkt

159

Reference level value

200

Process for the care of laundry

201

First step: Activate the heating element

203

Second process step: activation of the drum drive and the pump

205

Third method step: determining the first and second temperature values

207

Fourth process step: terminate the mixing phase

209

Fifth process step: End the washing process

211

Sixth step: Disabling the pump

213

Seventh step: Start another wash

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2161365 B1 [0003]

Claims (15)

A laundry care appliance (100) with a washing tub (105) for receiving washing liquid, the washing tub (105) having a drain opening (111) and an inlet opening (113) which are fluidly connected by a liquid line (115) to a laundry drum (107) for receiving laundry, a drum drive (123) for rotating the laundry drum (107), a temperature sensor for detecting a temperature of washing liquid in the tub (105), a heating element for heating the washing liquid, a pump (117) which is formed To pump washing liquid through the discharge opening (111) in the liquid line (115) and the pumped washing liquid through the inlet opening (113) again to the tub (105) to wet the laundry in the laundry drum (107), and a controller (119) for controlling the pump (117), the drum drive (123) and the heating element during a washing process (144), characterized g characterized in that the controller (119) is arranged to activate the heating element during a heating phase (145) of the washing process (144) until the detected temperature of the washing liquid in the tub (105) reaches a target temperature value (146) 119) is configured to activate the drum drive (123) during a mixing phase (147) of the washing process (144) subsequent to the heating phase (145) in order to rotate the laundry drum (107) and to activate the pump (117), to circulate the washing liquid and to wet the laundry accommodated in the laundry drum (107) with the heated recirculating washing liquid, the controller (119) being formed at the beginning of a reference period (153) of the mixing phase (147) a first temperature value and at the end of the Reference period (153) of the mixing phase (147) to determine a second temperature value, and wherein the controller (119) is formed, the End mixing phase (147) when the temperature difference between the first temperature value and the second temperature value falls below a temperature threshold to ensure a uniform temperature distribution in the washing liquid and in the laundry. Laundry care appliance (100) after Claim 1 characterized in that the controller (119) is adapted to terminate the washing process (144) when the determined second temperature value of the washing liquid at the end of the mixing phase (147) corresponds to the target temperature value (146) or the controller (119) is formed is to terminate the washing process (144) if the determined second temperature value of the washing liquid is within a variance range of the target temperature value (146) at the end of the mixing phase (147) or if the controller (119) is adapted to perform the washing process (144) stop when the determined temperature difference between the first temperature value and the second temperature value falls below a further temperature threshold. Laundry care appliance (100) after Claim 1 or 2 characterized in that the controller (119) is adapted to deactivate the pump (117) and the drum drive (123) during a collection phase (155) of the washing process (144) subsequent to the mixing phase (147) to provide washing liquid in the washing process Collecting lye container (105) if the determined second temperature value of the wash liquid at the end of the mixing phase (147) does not correspond to the target temperature value (146) or if the determined second temperature value of the wash liquid at the end of the mixing phase (147) is not within a variance range of the target temperature value (146), or if the determined temperature difference between the first temperature value and the second temperature value is less than the further temperature threshold value. Laundry care appliance (100) according to one of the preceding claims, characterized in that the controller (119) is designed to start a further washing process (144-2) of the laundry care appliance (100) after the mixing phase (147) or after the collecting phase (155) if the determined second temperature value of the scrubbing liquid at the end of the mixing phase (147) does not meet the target temperature value (146) or is not within a variance range of the target temperature value (146) or if the determined temperature difference between the first temperature value and the second temperature value is not the other temperature threshold value wherein the controller (119) is adapted to activate the heating element during a further heating phase (145-2) of the further washing process (144-2) until the detected temperature of the washing liquid in the tub (105) reaches a target temperature value (146). achieved, wherein the controller (119) is formed while ei to activate the drum drive (123) to the further heating phase (145-2) subsequent further mixing phase (147-2) of the further washing process (144-2) to rotate the laundry drum (107) and the pump (117) to circulate the washing liquid and to wet the laundry accommodated in the laundry drum (107) with the heated recirculated washing liquid, wherein the controller (119) is formed at the beginning of a reference period (153) of the further mixing phase (147-2) a first temperature value and determining a second temperature value at the end of the reference time period (152) of the further mixing phase (147-2), and wherein the controller (119) is arranged to terminate the further mixing phase (147-2) when the temperature difference between the first temperature value and the second temperature value falls below a temperature threshold to ensure a uniform temperature distribution in the washing liquid and in the laundry. The laundry care device (100) according to any one of the preceding claims, characterized in that the laundry care device (100) comprises a level sensor which is adapted to detect a level of washing liquid in the tub (105), and in that the laundry care device (100) a Waschflüssigkeitszuführeinrichtung for Supplying washing liquid into the tub (105), wherein the controller (119) is adapted to activate the Waschflüssigkeitszuführeinrichtung to supply washing liquid to the tub (105) when the detected level of washing liquid in the tub (105) falls below a reference level. Laundry care appliance (100) after Claim 5 , characterized in that the Waschflüssigkeitszuführeinrichtung is fluidly connected by a supply line to the tub (105), and in that the Waschflüssigkeitszuführeinrichtung in particular a Einspülschale (101) of the laundry care device (100). The laundry care device (100) according to any one of the preceding claims, characterized in that the laundry care device (100) comprises a level sensor, which is adapted to detect a level of washing liquid in the tub (105), wherein the controller (119) is formed To activate drum drive (123) in order to spin-wash washing liquid bound in the laundry and to supply the spin-off washing liquid to the tub (105) when the detected level of washing liquid in the tub (105) falls below a reference level. Laundry care appliance (100) according to one of the preceding claims, characterized in that the controller (119) is designed to activate the drum drive (123) during the mixing phase (147), at least in sections, around the laundry drum (107) during the mixing phase (147) to rotate at an abutment rotational speed (148) and to bring the laundry into abutment with the laundry drum (107). Laundry care appliance (100) according to one of the preceding claims, characterized in that the control (119) is designed to activate the drum drive (123) during the mixing phase (147) in order to move the laundry drum (107) at a reversing rotation speed, in particular in one of the Main direction of rotation of the laundry drum (107) during the mixing phase (147) oppositely directed Reversierrotationsrichtung, at least partially rotate. Laundry care appliance (100) after Claim 9 , characterized in that the controller (119) is adapted to rotate the laundry drum (107) during the reference period (153) with the Reversierrotationsgeschwindigkeit and / or in the Reversierrotationsrichtung. A laundry care device (100) according to any one of the preceding claims, characterized in that the laundry care device (100) comprises a level sensor which is adapted to detect a level of washing liquid in the tub (105), and in that the controller (119) is formed, during the heating phase (145) to activate the heating element when the detected level of washing liquid in the tub (105) exceeds a reference level. A method (200) for maintaining laundry in a laundry care device (100), wherein the laundry care device (100) comprises a suds container (105) for receiving washing liquid, wherein the suds container (105) has a discharge opening (111) and an inlet opening (113) which are fluidly connected by a fluid line (115), wherein the laundry care device (100) comprises a laundry drum (107) for receiving laundry, a drum drive (123) for rotating the laundry drum (107), a temperature sensor for detecting a temperature of washing liquid in the tub (105), a heating element for heating the washing liquid, a pump (117) adapted to pump washing liquid through the discharge opening (111) into the liquid line (115) and the pumped washing liquid through the inlet opening (113) again to the tub (105) to wet the laundry in the laundry drum (107), and a controller (119) for controlling the pump (117), the drum drive (123) and the heating element during a washing process (144), characterized in that the method (200) comprises the steps of activating (201) the heating element during a heating phase (145) washing (144) by the controller (119) until the detected temperature of the washing liquid in the tub (105) reaches a target temperature value (146), activating (203) the drum drive (123) to rotate the laundry drum (107), and the pump (117) for circulating the washing liquid during a mixing phase (147) subsequent to the heating phase (145) by the controller (119) to wet the laundry accommodated in the laundry drum (107) with the heated recirculated washing liquid ( 205) of a first temperature value at the beginning of a reference period (153) of the mixing phase (147) and a second temperature value at the end of a reference period (153) of the mixing phase (147) by the controller (119), and stopping (207) the mixing phase (147) by the controller (119) when the temperature difference between the first temperature value and the second temperature value falls below a temperature threshold value to ensure a uniform temperature distribution in the washing liquid and in the laundry. Method (200) according to Claim 12 characterized in that the method (200) comprises the step of terminating (209) the washing operation (144) by the controller (119) when the determined second temperature value of the washing liquid reaches the target temperature value (146) at the end of the mixing phase (147). or if the determined second temperature value of the wash liquid is within a variance range of the target temperature value (146) at the end of the mixing phase (147), or if the determined temperature difference between the first temperature value and the second temperature value is less than a further temperature threshold. Method (200) according to Claim 12 or 13 characterized in that the method (200) comprises the step of deactivating (211) the pump (117) and the drum drive (123) during a collection phase (155) of the washing process (144) subsequent to the mixing phase (147) the controller (119) to collect wash liquid in the tub (105) if the determined second temperature value of the wash liquid at the end of the mixing phase (147) does not correspond to the target temperature value (146) or if the determined second temperature value of the wash liquid is at the end of the wash cycle Blending phase (147) is not within a variance range of the target temperature value (146), or if the determined temperature difference between the first temperature value and the second temperature value does not fall below a further temperature threshold. Method (200) according to one of the preceding Claims 12 to 14 characterized in that the method (200) comprises the step of starting (213) a further washing operation (144-2) of the laundry-care appliance (100) after the mixing phase (147) or after the collection phase (155) by the controller (119 when the determined second temperature value of the wash liquid at the end of the mixing phase (147) does not meet the target temperature value (146) or is not within a variance range of the target temperature value (146), or if the determined temperature difference between the first temperature value and the second temperature value is another Temperature threshold does not fall below, wherein the further washing process (144-2) comprises a further heating phase (145-2) and to the further heating phase (145) subsequent further mixing phase (147).

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