DE102022203316A1 - Laundry care device with a control and method for operating the laundry care device - Google Patents

Abstract

The present invention relates to a laundry care device (100) with a tub (105) for holding washing liquid (129), a fill level sensor (120) for detecting a fill level (133) of washing liquid in the tub (105), a laundry drum (107). Receiving laundry, the laundry drum (107) being arranged in the tub (105), a drum drive (109) for rotating the laundry drum (107), a temperature sensor (123) for detecting a temperature of the drum drive (109), a pump ( 117) for pumping washing liquid from the tub (105), and a control (119), which is connected in terms of control technology to the drum drive (109), the fill level sensor (120), the temperature sensor (123) and the pump (117). The control (119) is designed to detect a temperature of the drum drive (109) by means of the temperature sensor (123) and a level (133) of washing liquid in the tub (105) by means of the fill level sensor (120) during an overheat detection period (141). The controller (119) is designed to activate the pump (117) for pumping out washing liquid from the tub (105) during an adaptation period (149) following the overheat detection period (141) if the temperature detected during the overheat detection period (141). of the drum drive (109) is above a temperature threshold value (145) and the level (133) of washing liquid in the tub (105) detected during the overheat detection period (141) is above a level threshold value in order to avoid overheating of the drum drive (109).

Description

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

In a conventional laundry care appliance, incorrect operation by the user of the laundry care appliance may occur. Corresponding incorrect operations include, in particular, the selection of a laundry care program that is unsuitable for the laundry care process, overloading the laundry drum with laundry, reloading laundry while a laundry care program is running, changing the laundry care program, manually supplying washing liquid, and / or other incorrect operations.

Corresponding incorrect operation may result in a mismatch between the washing liquid held in the tub and the laundry held in the laundry drum, as a result of which the drum drive, which rotates the laundry drum, may overheat and thereby be damaged.

In the EP 3 085 825 a method for operating a washing machine is disclosed.

It is the object underlying the invention to provide a laundry care device with a drum drive for rotating a laundry drum and a corresponding method for operating the laundry care device, in which overheating of the drum drive is avoided.

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.

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 level sensor for detecting a level of washing liquid in the tub, a laundry drum for holding laundry, the laundry drum being arranged in the tub, a Drum drive for rotating the laundry drum, a temperature sensor for detecting a temperature of the drum drive, a pump for pumping washing liquid from the tub, and a control, which is connected in terms of control technology to the drum drive, the fill level sensor, the temperature sensor and the pump, the control being formed is to detect a temperature of the drum drive by means of the temperature sensor during an overheat detection period and a level of washing liquid in the tub by means of the fill level sensor, and the controller is designed to pump the pump for pumping out washing liquid from the tub during an adaptation period following the overheat detection period to activate if the temperature of the drum drive detected during the overheat detection period is above a temperature threshold and the level of washing liquid in the tub detected during the overheat detection period is above a level threshold in order to avoid overheating of the drum drive.

This achieves the technical advantage that overheating of the drum drive can be effectively avoided.

The overheating detection time period can in particular be a time period of a laundry care program stored in the control of a plurality of laundry care programs of the laundry care device, so that a possible overheating problem of the drum drive can be recognized early by the control. In particular, the overheating detection period can be a period of any laundry care program stored in the control.

The temperature sensor, which detects the temperature of the drum drive, is in particular in thermally conductive contact with the drum drive. In particular, the temperature sensor is arranged in or on the drum drive and thereby enables the control to determine the temperature of the drum drive in real time. The temperature sensor can also be a sensor unit that can determine the temperature of the drum drive indirectly, for example via a resistance measurement of one or more windings or via a calculation model stored in the control that evaluates one or more motor parameters detected by the sensor unit with regard to the temperature of the drum drive.

During the overheating detection period, the controller compares the temperature detected by the temperature sensor with the temperature threshold value, the temperature threshold value being in particular a predetermined temperature threshold value, which is stored in the controller, for example, depending on the type of laundry care device used and/or the laundry care program being executed.

If the recorded temperature of the drum drive exceeds the temperature threshold, the control recognizes a possible criterion that indicates an impending overheating of the drum drive.

Here, the temperature threshold value is in particular lower, in particular approximately 10 ° C lower, than a limit temperature threshold value, which corresponds to a temperature value at which damage to the drum drive is possible. The sufficient distance between the temperature threshold and the limit temperature threshold ensures that if the temperature threshold is exceeded, the controller still has sufficient time to intervene and prevent the temperature from reaching the limit temperature threshold.

A further criterion which indicates an impending overheating of the drum drive is when the control determines that a level value of washing liquid in the tub detected by the level sensor exceeds a level threshold value stored in the control, the level threshold value being in particular a predetermined level threshold value, which, for example is stored in the control depending on the type of laundry care device used and/or the laundry care program being executed.

A correspondingly determined by the control high level of washing liquid in the tub in combination with a certain high temperature value of the drum drive during the overheat detection period enables the control to draw conclusions about excessive stress on the drum drive due to an excessively high level of washing liquid in the tub.

For this reason, during the adjustment period following the overheat detection period, the controller activates the pump to pump out washing liquid from the tub and thereby reduce the level of washing liquid in the tub.

Due to the correspondingly reduced filling level of washing liquid in the tub, the resistance which is opposed by the washing liquid to the rotating laundry drum is reduced, whereby the stress on the drum drive can be reduced, and the temperature of the drum drive is thereby reduced again.

A laundry care device is a device that is used to care for laundry, such as a washing machine or a tumble 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.

In an advantageous embodiment, the control is designed to activate the drum drive for rotating the laundry drum at an adjusted speed during the adaptation period and to activate the pump for pumping out washing liquid from the tub when the temperature of the drum drive detected during the overheat detection period is above the temperature threshold and the level of washing liquid in the tub detected during the overheat detection period is above the level threshold value.

This achieves the technical advantage that, in addition to pumping out washing liquid from the tub, rotating the laundry drum at the adjusted speed also results in an effective reduction in the stress on the drum drive and thus an effective reduction in the temperature of the drum drive.

By adjusting the speed of the laundry drum during the adjustment period, a particularly advantageous distribution of the laundry in the laundry drum is achieved, so that imbalances in the laundry drum and power peaks in the drum drive resulting from the imbalances can be reduced.

In particular, the control is designed to activate the drum drive to rotate the laundry drum at an increased speed during the adaptation period, the increased speed being increased compared to a standard speed of a previous laundry care program. The standard speed of the previous laundry care program in particular includes a speed less than or equal to a system speed at which the laundry picked up in the laundry drum is applied to the rotating laundry drum.

Because the increased speed at which the laundry drum is rotated during the adaptation period is greater than the standard speed of the previous laundry care program, the laundry picked up in the laundry drum is achieved during the adaptation period evenly applied to the rotating laundry drum, thus reducing the occurrence of agglomerations of laundry in the laundry drum. This means that the laundry is placed on the rotating laundry drum as a homogeneous laundry ring and power peaks in the drum drive resulting from imbalances can be reduced.

In particular, the increased speed is between 1.3 and 1.5 times as high as the standard speed, in particular the application speed, of the previous laundry care program. If the application speed of the previous laundry care program is, for example, 60 revolutions per minute, the increased speed is between 80 revolutions per minute and 90 revolutions per minute.

In an advantageous embodiment, the control is designed to activate the pump for pumping out washing liquid from the tub and in particular also the drum drive for rotating the laundry drum at the adapted speed during the adaptation period if the temperature of the drum drive detected during the overheat detection period is above the temperature threshold and the fill level of washing liquid in the tub detected during the overheat detection period is above the fill level threshold value and an electrical performance parameter, in particular motor current and / or motor torque, of the drum drive detected by the controller is above a power threshold value.

This achieves the technical advantage that by taking into account the electrical performance parameter of the drum drive, in particular motor current and/or motor torque, the control has a further parameter available, which enables the control to determine during the overheat detection period that there is a possible risk of the drum drive overheating .

If the electrical performance parameter, in particular motor current and/or motor torque, of the drum drive is above the power threshold value, the corresponding high power consumption of the drum drive indicates a high load on the drum drive.

In an advantageous embodiment, the control is designed to activate the pump for pumping out washing liquid from the tub during the adaptation period when the drum drive rotates the laundry drum at the adapted speed.

This achieves the technical advantage that the pump only pumps out washing liquid from the tub when the adjusted speed of the laundry drum is reached during the adaptation period, so that a particularly advantageous pumping out of washing liquid from the tub is ensured.

In an advantageous embodiment, the control is designed to deactivate the pump again during the adaptation period if a second filling level of washing liquid in the tub detected during the adaptation period is equal to or smaller than the filling level threshold value.

This achieves the technical advantage that the control deactivates the pump again during the adaptation period when the level of washing liquid in the tub has dropped sufficiently. This keeps the adjustment period as short as possible.

In an advantageous embodiment, the controller is designed to activate the pump for pumping out washing liquid from the tub during a fill level check period following the adaptation period if a third fill level of washing liquid in the tub detected during the fill level check period is above a second fill level threshold value, whereby the second fill level threshold value is greater than the first fill level threshold value, wherein the controller is designed to deactivate the drum drive during the fill level check period in order not to rotate the laundry drum during the fill level check period.

This achieves the technical advantage that during the fill level checking period, due to the non-rotating laundry drum, the movement of the washing liquid contained in the tub is stopped, so that the washing liquid collects in a lower region of the tub and thus a particularly effective new level measurement is made possible.

If the third level value detected during the level check period is greater than the second level threshold value, then the pump for pumping out washing liquid from the tub is activated again during the level check period in order to further reduce the level of washing liquid in the tub.

In an advantageous embodiment, the control is designed to activate the drum drive for rotating the laundry drum at the adjusted speed during a rotation period following the filling level checking period, with the rotation period being followed in particular by a further filling level checking period.

This achieves the technical advantage that an effective spin-free release of further washing liquid, for example from the laundry, is achieved during the rotation period which follows the fill level checking period.

In an advantageous embodiment, the controller is designed to repeat the fill level check period until the third fill level of washing liquid detected during the fill level check period is less than the second fill level threshold value.

This achieves the technical advantage that iterative repetitions of the level checking period can ensure that the pump for pumping out washing liquid from the tub is activated until the third level of washing liquid recorded during the level checking period falls below the second level threshold value.

In an advantageous embodiment, the controller is designed to activate the drum drive for rotating the laundry drum at a standard speed of the laundry care program stored in the controller during a temperature checking period following the fill level checking period and/or rotation period, the controller being designed to activate the drum drive during the temperature checking period by means of the Temperature sensor to detect a temperature increase in the drum drive.

This achieves the technical advantage that, during the temperature check period, the control detects any possible overheating of the drum drive that may still be present, or alternatively, based on the detected temperature increase, the control can ensure that the previous steps effectively eliminate a possible overheating of the drum drive could be prevented and the laundry care program can then be continued at the standard speed.

In particular, the temperature increase is represented by the quotient of ΔT/Δt, where Δt corresponds to the duration of the temperature check period, and where ΔT corresponds to the difference between the maximum detected temperature and the minimum detected temperature during the temperature check period.

In an advantageous embodiment, the control is designed to activate the pump for pumping out washing liquid from the tub and in particular also the drum drive for rotating the laundry drum at the adjusted speed during a second adaptation period following the temperature check period and in particular also the drum drive for rotating the Activate the laundry drum at the adjusted speed if the temperature rise detected during the temperature check period exceeds a temperature rise limit.

This achieves the technical advantage that by comparing the temperature increase recorded during the temperature check period with the temperature increase limit value, the control can use an advantageous criterion as to whether the drum drive is at risk of overheating or not.

If the temperature increase recorded during the temperature check period exceeds the temperature increase limit value, there is still a risk of the drum drive overheating, and the control reacts to this by carrying out a second adaptation period, during which the pump pumps out washing liquid again and during which, in particular, the laundry drum is rotated again at the adjusted speed .

In an advantageous embodiment, the control is designed to activate the pump for pumping out washing liquid from the tub and in particular also the drum drive for rotating the laundry drum at the adapted speed during a second fill level checking period following the second adaptation period, if during the second The fourth level of washing liquid in the tub detected during the level check period is above a third level threshold, the third level threshold being greater than the second level threshold.

This achieves the technical advantage that is advantageous for the control during the second fill level checking period it can be determined whether the activation of the pump carried out during the second adaptation period was sufficient to sufficiently reduce the level of washing liquid in the tub.

In an advantageous embodiment, the controller is designed to activate the drum drive for rotating the laundry drum at a standard speed of a laundry care program stored in the controller during a second temperature checking period following the second fill level checking period, wherein the controller is designed to operate during the second temperature checking period by means of the temperature sensor to detect an increase in temperature of the drum drive.

This achieves the technical advantage that the risk of overheating of the drum drive can be assessed again by the control during the second temperature check period.

In an advantageous embodiment, the controller is designed to deactivate the drum drive and to transmit a warning message to a warning message output device of the laundry care appliance when the temperature increase detected during the second temperature check period exceeds the temperature increase limit value.

This achieves the technical advantage that if the temperature increase limit value is exceeded again by the temperature increase detected during the second temperature check period, there may be a defect in the laundry care device, which requires manual intervention by the user or a service technician.

In an advantageous embodiment, the controller is designed to execute the laundry care program stored in the controller during a normal laundry care segment following the temperature check period or second temperature check period, and to activate the drum drive for rotating the laundry drum at a standard speed of the laundry care program stored in the controller when the The temperature rise detected during the first or second temperature check period is equal to or less than the temperature rise limit.

This achieves the technical advantage that if a temperature increase is detected during the first or second temperature check period, which is equal to or smaller than the temperature increase limit, the laundry care program can be continued normally, since there is no longer any risk of the drum drive overheating.

According to a second aspect, the object according to the invention is achieved by a method for avoiding overheating of a drum drive in a laundry care appliance, wherein the laundry care appliance has a tub for holding washing liquid, a level sensor for detecting a level of washing liquid in the tub, a laundry drum for holding laundry , wherein the laundry drum is arranged in the tub, a drum drive for rotating the laundry drum, a temperature sensor for detecting a temperature of the drum drive, a pump for pumping washing liquid from the tub, and a controller, which is connected in terms of control technology to the drum drive, the fill level sensor, the temperature sensor and the pump, the method having the following method steps: detecting a temperature of the drum drive by means of the temperature sensor and a level of washing liquid in the tub by means of the level sensor by the controller during the overheat detection period, activating the pump for pumping out washing liquid the tub by the controller during an adjustment period following the overheat detection period if the temperature of the drum drive detected during the overheat detection period is above a temperature threshold and the level of washing liquid in the tub detected during the overheat detection time is above a level threshold in order to avoid overheating of the drum drive .

This achieves the technical advantage that overheating of the drum drive can be effectively avoided.

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.

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

• 1 eine schematische Ansicht eines Wäschepflegegeräts;
• 2 eine schematische Ansicht eines Wäschepflegegeräts mit einer Steuerung;
• 3 eine schematische Ansicht eines Wäschepflegevorgangs gemäß einer Ausführungsform; und
• 4 eine schematische Darstellung eines Verfahrens zum Vermeiden einer Überhitzung eines Trommelantriebs in einem Wäschepflegegerät gemäß einer Ausführungsform.

Show it:

• 1 a schematic view of a laundry care device;
• 2 a schematic view of a laundry care device with a control;
• 3 a schematic view of a laundry care process according to an embodiment; and
• 4 a schematic representation of a method for preventing overheating of a drum drive in a laundry care appliance according to one embodiment.

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.

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 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 2 101 of the laundry care appliance 100, not shown, and/or an in 2 fresh water connection, not shown, of the laundry care device 100, wherein a controller 119 of the laundry care device 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 and the tub 105.

The laundry care appliance 100 has a fill level sensor 120 arranged in the tub 105, which is designed to detect a fill level of washing liquid in the tub 105, the fill level sensor 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 the drum drive 109, the temperature sensor 123 being connected to the controller 119 in terms of control technology. In particular, the temperature sensor 123 is arranged in or on the drum drive 109.

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 fill level sensor 120, and which is connected to the temperature sensor 123, each through a control connection 121.

3 shows a schematic view of a laundry care process according to an embodiment.

In the 3 First curve 127 shown shows along the ordinate axis 129 a temperature of the drum drive 109 of the laundry care appliance 100 detected by a temperature sensor 123 as a function of the time, which is plotted along the abscissa axis 131.

In the 3 The further illustrations shown each show a filling level 133 of washing liquid in a tub 105 of the laundry care appliance 100 at correspondingly different time periods.

In the 3 The second curve 135 shown shows along the ordinate axis 137 a rotational speed of a laundry drum 107 of the laundry care appliance 100 caused by the drum drive 109 as a function of the time, which is plotted along the abscissa axis 139.

During an overheat detection period 141, the controller 119 executes a laundry care program and activates the drum drive 109 to rotate the laundry drum 107 at a standard speed 143 of the laundry care program stored in the controller 119.

The corresponding standard speed 143 corresponds to a washing speed, which is preferably less than or equal to an application speed of the laundry drum 107, at which the laundry picked up in the laundry drum 107 is currently in contact with the laundry drum 107.

As shown in the first curve 127, the temperature sensor 123 detects the temperature of the drum drive 109 during the overheat detection period 141. In addition, during the overheat detection period 141, the level sensor 120 detects a level 133 of washing liquid in the tub 105, as shown in the left illustration.

The controller 119 detects that at the end of the overheat detection period 141, the detected temperature of the drum drive 109 is above a temperature threshold 145. Here, the temperature threshold 145 is slightly, in particular approximately 10° C., below a limit temperature threshold 147 in order to ensure that damage to the drum drive 109 can be ruled out when the temperature threshold 145 is reached. The temperature threshold value 145 and limit temperature threshold value 147 are stored in the controller 119 in a predetermined manner, in particular depending on the type of laundry care appliance and/or depending on the laundry care program being executed.

In addition, the controller 119 recognizes that at the end of the overheating detection period 141 the in 3 Detected level 133 of washing liquid, which is only shown schematically, is above a level threshold value. The fill level threshold value is stored in the controller 119 in a predetermined manner, in particular depending on the type of laundry care appliance and/or the laundry care program being executed.

In order to avoid a further increase in the temperature of the drum drive 109 and to prevent damage to the drum drive 109, the controller 119 activates the pump 117 for pumping out washing liquid from the tub 105 and the drum drive 109 during an adjustment period 149 following the overheat detection period 141 Rotating the laundry drum 107 at an adjusted speed 151.

Like from the 3 can be removed, the corresponding adjusted speed 151 is above the application speed, and is in particular 1.3 to 1-5 times the application speed depending on the size of the laundry drum 107 and the load quantity of the laundry drum 107. If the application speed is, for example, 60 Revolutions per minute, the adjusted speed 151 is, for example, between 80 revolutions per minute and 90 revolutions per minute.

By rotating the laundry drum 107 with the adapted speed 151, which is increased compared to the standard speed 143, during the adaptation period 149, a particularly advantageous, uniform application of the laundry to the laundry drum 107 is achieved, whereby any imbalances that may occur can be avoided, and a particularly uniform rotation behavior of the laundry drum 107 and thus a particularly homogeneous performance profile of the drum drive 109 can be ensured.

Furthermore, by pumping out washing liquid from the tub 105 during the adjustment period 149, the rotational resistance of the laundry drum 107 rotating through the washing liquid is reduced, whereby the power consumption of the drum drive 109 can also be reduced.

Here, the controller 119 is designed in particular to activate the pump 117 for pumping out washing liquid from the tub 105 during the adaptation period 149 when the drum drive 109 rotates the laundry drum 107 at the adapted speed 151.

In order not to impair the user of the laundry care appliance 100 due to the volume of the pumping noise, it may be particularly advantageous to keep the pumping process during the adjustment period 149 as short as necessary. Here, the controller 119 is in particular designed to deactivate the pump 117 again during the adaptation period 149 if a second fill level 133 of washing liquid in the tub 105 detected during the adaptation period 149 is equal to or smaller than the fill level threshold value.

Subsequently, the controller 119 is designed to activate the pump 117 for pumping out washing liquid from the tub 105 during a filling level checking period 153 following the adaptation period 149 if a third filling level 133 of washing liquid in the tub 105 detected during the filling level checking period 153 is above one second fill level threshold value, wherein the second fill level threshold value is greater than the first fill level threshold value. The controller 119 is designed to deactivate the drum drive 109 during the fill level check period 153 in order not to rotate the laundry drum 107 during the fill level check period 153.

The standstill of the laundry drum 107 during the fill level check period 153 ensures that the washing liquid is in a stationary state, so that during the fill level check period Section 153 allows effective level measurement to be carried out.

If, during the fill level check period 153, the detected third fill level 133 of washing liquid in the tub 105 is above the second fill level threshold, which is greater than the first fill level threshold, the pump 117 is activated to pump out washing liquid from the tub 105.

Here, the controller 119 is designed to activate the drum drive 109 for rotating the laundry drum 107 at the adjusted speed 151 during a rotation period 155 following the fill level check period 153, with the rotation period 155 being followed in particular by a further fill level check period 153.

Here, the controller 119 is designed to repeat the fill level check period 153 until the third fill level 133 of washing liquid detected during the fill level check period 153 is smaller than the second fill level threshold value.

Here, the controller 119 is designed to activate the drum drive 109 for rotating the laundry drum 107 at the standard speed 143 of the laundry care program stored in the controller 119 during a temperature checking period 157 following the fill level checking period 153 and/or rotation period 155. Here, the controller 119 is designed to detect a temperature increase of the drum drive 109 during the temperature check period 157 using the temperature sensor 123.

Like in the 3 is shown, the controller 119 determines the temperature increase by the quotient of ΔT/Δt, where Δt corresponds to the duration of the temperature check period 157, and where ΔT corresponds to the difference between the maximum detected temperature and the minimum detected temperature during the temperature check period 157.

The controller 119 is designed to activate the pump 117 for pumping out washing liquid from the tub 105 during a second adaptation period 159 following the temperature check period 157 and to activate the drum drive 109 for rotating the laundry drum 107 at the adjusted speed 151 when the Temperature rise detected during the temperature check period 157 exceeds a temperature rise limit.

The controller 119 is designed to activate the pump 117 for pumping out washing liquid from the tub 105 during a second filling level checking period 161 following the second adaptation period 159 if a fourth filling level 133 of washing liquid in the tub 105 detected during the second filling level checking period 161 is above a third fill level threshold, wherein the third fill level threshold is greater than the second fill level threshold. Here, the controller 119 is designed to repeat the second fill level check period 163 until the fourth fill level 133 of washing liquid detected during the fill level check period 163 is smaller than the third fill level threshold value.

The controller 119 is designed to activate the drum drive 109 for rotating the laundry drum 107 with a standard speed 143 of the laundry care program stored in the controller 119 during a second temperature checking period 163 following the second fill level checking period 161, the controller 119 being designed during the second Temperature check period 163 to detect a temperature increase of the drum drive 109 using the temperature sensor 123.

The controller 119 is designed to operate during a period following the second temperature check period 163 and in 3 normal laundry care section, not shown, to execute the laundry care program stored in the controller 119, and to activate the drum drive 109 for rotating the laundry drum 107 at a standard speed 143 of a laundry care program stored in the controller 119 if the temperature rise detected during the temperature check period is equal to or less than the temperature rise limit value .

In this case, the selected laundry care program of the laundry care appliance 100 can advantageously be continued without the risk of the drum drive 109 overheating.

However, the controller 119 is designed to deactivate the drum drive 109 and to transmit a warning message to a warning message output device of the laundry care device 100 if the temperature increase detected during the second temperature check period 163 exceeds the temperature increase limit value.

In this case, a warning message to the user seems useful in order to enable the laundry care program to be canceled and to ensure that the drum drive 109 is not damaged due to overheating.

4 shows a schematic representation of a method for avoiding overheating of a drum drive in a laundry care appliance according to one embodiment.

The method 200 includes, as a first method step, detecting 201 a temperature of the drum drive 109 by means of the temperature sensor 123 and a fill level 133 of washing liquid in the tub 105 by means of the fill level sensor 120 by the controller 119 during an overheat detection period 141.

The method 200 includes, as a second method step, the activation 203 of the pump 117 for pumping out washing liquid from the tub 105 by the controller 119 during an adjustment period 149 following the overheat detection period 141, if the temperature of the drum drive 109 recorded during the overheat detection period 141 is above a temperature threshold 145 and the level 133 of washing liquid in the tub 105 detected during the overheat detection period 141 is above a level threshold in order to avoid overheating of the drum drive 109.

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

Level sensor

121

Control connection

123

Temperature sensor

125

outlet line

127

First corner

129

Ordinate axis with respect to the first curve

131

Abscissa axis with respect to the first curve

133

Level of washing liquid in the tub

135

Second curve

137

Ordinate axis with respect to the second curve

139

Abscissa axis with respect to the second curve

141

Overheat detection period

143

Standard speed

145

Temperature threshold

147

Limit temperature threshold

149

Adjustment period

151

Adjusted speed

153

Level check period

155

Rotation period

157

Temperature check period

159

Second adjustment period

161

Second level check period

163

Second temperature check period

200

Method for preventing overheating of a drum drive

201

First step of the process: recording a temperature and a fill level

203

Second step: Activate the pump

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was 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 3085825 [0004]

Claims (15)

Laundry care device (100) with a tub (105) for holding washing liquid (129), a level sensor (120) for detecting a level (133) of washing liquid in the tub (105), a laundry drum (107) for holding laundry, whereby the laundry drum (107) is arranged in the tub (105), a drum drive (109) for rotating the laundry drum (107), a temperature sensor (123) for detecting a temperature of the drum drive (109), a pump (117) for pumping Washing liquid from the tub (105), and a controller (119), which is connected in terms of control technology to the drum drive (109), the fill level sensor (120), the temperature sensor (123) and the pump (117), characterized in that the controller (119) is designed to detect a temperature of the drum drive (109) by means of the temperature sensor (123) and a level (133) of washing liquid in the tub (105) by means of the fill level sensor (120) during an overheat detection period (141) that the Control (119) is designed to activate the pump (117) for pumping out washing liquid from the tub (105) during an adaptation period (149) following the overheat detection period (141) if the temperature detected during the overheat detection period (141). of the drum drive (109) is above a temperature threshold value (145) and the level (133) of washing liquid in the tub (105) detected during the overheat detection period (141) is above a level threshold value in order to avoid overheating of the drum drive (109). Laundry care device (100). Claim 1 , characterized in that the control (119) is designed to activate the drum drive (109) for rotating the laundry drum (107) at an adjusted speed (151) and the pump (117) for pumping out washing liquid during the adaptation period (149). from the tub (105) if the temperature of the drum drive (109) detected during the overheat detection period (141) is above the temperature threshold value (145) and the level (133) of washing liquid in the tub (105) detected during the overheat detection time period (141). ) is above the level threshold. Laundry care device (100). Claim 1 or 2 , characterized in that the control (119) is designed to include the pump (117) for pumping out washing liquid from the tub (105) and in particular the drum drive (109) for rotating the laundry drum (107) during the adaptation period (149). to activate the adjusted speed (151) if the temperature of the drum drive (109) detected during the overheat detection period (141) is above the temperature threshold value (145) and the filling level (133) of washing liquid in the tub (105) detected during the overheat detection period (141). ) is above the fill level threshold value and an electrical performance parameter, in particular motor current and / or motor torque, of the drum drive (109) detected by the controller (119) is above a performance threshold value. Laundry care device (100). Claim 2 or 3 , characterized in that the control (119) is designed to activate the pump (117) for pumping out washing liquid from the tub (105) during the adaptation period (149) when the drum drive (109) connects the laundry drum (107) with the adjusted speed (151). Laundry care device (100) according to one of the preceding claims, characterized in that the control (119) is designed to deactivate the pump (117) again during the adaptation period (149) if a second filling level (133) detected during the adaptation period (149). ) of washing liquid in the tub (105) is equal to or less than the fill level threshold value. Laundry care device (100) according to one of the preceding claims, characterized in that the control (119) is designed, during a filling level checking period (153) following the adaptation period (149), the pump (117) for pumping out washing liquid from the tub ( 105) to activate if a third level (133) of washing liquid in the tub (105) detected during the level check period (153) is above a second level threshold, the second level threshold being greater than the first level threshold, the controller (119) is designed to deactivate the drum drive (109) during the level check period (153) in order not to rotate the laundry drum (107) during the level check period (153). Laundry care device (100). Claim 6 , characterized in that the control (119) is designed to rotate the drum drive (109) for rotating the laundry drum during a rotation period (155) following the fill level checking period (153). (107) with the adapted speed (151), with the rotation period (155) being followed in particular by a further fill level checking period (153). Laundry care device (100). Claim 6 or 7 , characterized in that the controller (119) is designed to repeat the fill level check period (153) until the third fill level (133) of washing liquid detected during the fill level check period (153) is less than the second fill level threshold value. 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 a temperature checking period (157) following the fill level checking period (153) and/or rotation period (155). for rotating the laundry drum (107) at a standard speed (143) of the laundry care program stored in the control (119), the control (119) being designed to detect a temperature increase of the drum drive during the temperature check period (157) by means of the temperature sensor (123). (109) to capture. Laundry care device (100). Claim 9 , characterized in that the controller (119) is designed to activate the pump (117) for pumping out washing liquid from the tub (105) and in particular also the drum drive during a second adaptation period (159) following the temperature check period (157). (109) to rotate the laundry drum (107) at the adjusted speed (151) if the temperature increase detected during the temperature check period (157) exceeds a temperature increase limit. Laundry care device (100). Claim 10 , characterized in that the control (119) is designed, during a second fill level checking period (161) following the second adaptation period (159), the pump (117) for pumping out washing liquid from the tub (105) and in particular also the drum drive (109) to rotate the laundry drum (107) at the adjusted speed (151) if a fourth level (133) of washing liquid in the tub (105) detected during the second level check period (161) is above a third level threshold, whereby the third fill level threshold value is greater than the second fill level threshold value. Laundry care device (100). Claim 11 , characterized in that the control (119) is designed to control the drum drive (109) for rotating the laundry drum (107) at a standard speed (143) of one in the during a second temperature checking period (163) following the second fill level checking period (161). To activate the laundry care program stored in the control (119), the control (119) being designed to detect a temperature increase of the drum drive (109) during the second temperature check period (163) by means of the temperature sensor (123). Laundry care device (100). Claim 12 , characterized in that the controller (119) is designed to deactivate the drum drive (109) and to transmit a warning message to a warning message output device of the laundry care device (100) when the temperature increase detected during the second temperature check period (163) exceeds the temperature increase limit value. Laundry care device (100) according to one of the Claims 9 until 13 , characterized in that the control (119) is designed to execute the laundry care program stored in the control (119) during a normal laundry care period following the temperature check period (157) or second temperature check period (163), and the drum drive (109) for rotating to activate the laundry drum (107) at a standard speed (143) of the laundry care program stored in the control (119) if the temperature increase detected during the first or second temperature check period (157, 163) is equal to or less than the temperature increase limit. Method (200) for preventing overheating of a drum drive (109) in a laundry care appliance (100), wherein the laundry care appliance (100) has a tub (105) for holding washing liquid (129), a fill level sensor (120) for detecting a fill level (133 ) of washing liquid in the tub (105), 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 temperature sensor (123) for detecting a temperature of the drum drive (109), a pump (117) for pumping washing liquid from the tub (105), and a controller (119), which is connected in terms of control technology to the drum drive (109), the fill level sensor (120 ), the temperature sensor (123) and the pump (117) is connected, characterized in that the method (200) has the following method steps: detecting (201) a temperature of the drum drive (109) by means of the temperature sensor (123) and a fill level (133) of washing liquid in the tub (105) by means of the Fill level sensor (120) by the controller (119) during the overheat detection period (141), activating (203) the pump (117) for pumping out washing liquid from the tub (105) by the controller (119) during an overheat detection period (141 ) subsequent adjustment period (149), if the temperature of the drum drive (109) recorded during the overheat detection period (141) is above a temperature threshold value (145) and the level (133) of washing liquid in the tub (105) recorded during the overheat detection period (141) is above a fill level threshold value in order to avoid overheating of the drum drive (109).

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