CN116892103A

CN116892103A - Laundry care appliance and method for operating a laundry care appliance

Info

Publication number: CN116892103A
Application number: CN202310343225.6A
Authority: CN
Inventors: D·弗洛厄; K·派泽特; 史怡春
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2022-04-04
Filing date: 2023-04-03
Publication date: 2023-10-17
Also published as: DE102022203316A1; EP4269682A1

Abstract

The invention relates to a laundry care appliance having an alkaline solution container, a liquid level sensor, a laundry drum, a drum drive, a temperature sensor, a pump, and a control unit, which is connected to the drum drive, the liquid level sensor, the temperature sensor and the pump in terms of control technology, the control unit being designed for detecting the temperature of the drum drive by means of the temperature sensor and the level of the washing liquid in the alkaline solution container by means of the liquid level sensor during an overheat detection time period, the control unit being designed for: during a matching time interval following the overheat detection time interval, when the temperature detected by the drum drive during the overheat detection time interval is above a temperature threshold and the level of the washing liquid in the lye container detected during the overheat detection time interval is above a level threshold, a pump is activated to pump the washing liquid out of the lye container in order to avoid overheating of the drum drive.

Description

Laundry care appliance and method for operating a laundry care appliance

Technical Field

The present invention relates to a laundry care appliance having a control portion.

Background

In a conventional laundry care appliance, a user of the laundry care appliance may malfunction. Corresponding malfunctions include, among others, selecting a laundry care program unsuitable for a laundry care process, overloading a laundry drum with laundry, reloading laundry during the operation of the laundry care program, changing the laundry care program, manually supplying washing liquid and/or other malfunctions.

As a result of corresponding malfunctions, incorrect proportions of the washing liquid received in the lye container and the laundry received in the laundry drum may result, whereby the drum drive which rotates the laundry drum may overheat and thus be damaged.

A method for operating a washing machine is disclosed in EP 3 085 825.

Disclosure of Invention

The object of the present invention is to provide a laundry care appliance having a drum drive for rotating a laundry drum and a corresponding method for operating a laundry care appliance, in which overheating of the drum drive is avoided.

This object is achieved by the subject matter having the features according to the invention. Advantageous embodiments are the subject matter of the description and of the figures.

According to a first aspect, the object according to the invention is achieved by a laundry care appliance having: an alkaline solution container for receiving a washing solution; a liquid level sensor for detecting a liquid level of the washing liquid in the lye container; a laundry drum for receiving laundry, wherein the laundry drum is arranged in the lye container; a drum driving device for rotating the laundry drum; a temperature sensor for detecting a temperature of the drum driving device; a pump for pumping the washing liquid from the lye container; and a control unit which is connected to the drum drive, the liquid level sensor, the temperature sensor and the pump in terms of control technology, wherein the control unit is configured for detecting the temperature of the drum drive by means of the temperature sensor and the liquid level of the washing liquid in the lye container by means of the liquid level sensor during the overheat detection time period, wherein the control unit is configured for: during a matching time interval following the overheat detection time interval, when the temperature detected by the drum drive during the overheat detection time interval is above a temperature threshold and the level of the washing liquid in the lye container detected during the overheat detection time interval is above a level threshold, a pump is activated to pump the washing liquid out of the lye container in order to avoid overheating of the drum drive.

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

In this case, the overheat detection time segment may be, in particular, a time segment of a laundry care program stored in the control unit among a plurality of laundry care programs of the laundry care appliance, so that a possible overheat problem of the drum drive can be detected in advance by the control unit. The overheat detection time section may be in particular a time section of any laundry care program stored in the control section.

The temperature sensor for detecting 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 thus enables the control unit to determine the temperature of the drum drive in real time. The temperature sensor may also be a sensor unit which can indirectly determine the temperature of the drum drive, for example by means of a resistance measurement of one or more coils or by means of a calculation module stored in the control unit which evaluates one or more motor parameters detected by the sensor unit in terms of the temperature of the drum drive.

During the overheat detection time period, the control unit compares the temperature detected by the temperature sensor with a temperature threshold value, wherein the temperature threshold value is in particular a predetermined temperature threshold value, which is stored in the control unit, for example, as a function of the type of laundry care appliance used and/or the laundry care program implemented.

If the detected temperature of the drum drive is above a temperature threshold, the control unit identifies a possible criterion indicating that the drum drive is at risk of overheating.

The temperature threshold is in particular smaller than a limit temperature threshold, in particular about 10 ℃ smaller than the limit temperature threshold, which corresponds to a temperature value at which the drum drive may be damaged. By sufficient spacing between the temperature threshold and the extreme temperature threshold, it is ensured that the control has sufficient time to intervene and prevent the temperature from reaching the extreme temperature threshold when the temperature threshold is exceeded.

Another criterion for indicating that the drum drive is at risk of overheating is: the control unit determines that the level value of the washing liquid in the lye container detected by the level sensor exceeds a level threshold value stored in the control unit, wherein the level threshold value is in particular a predetermined level threshold value, which is stored in the control unit, for example, as a function of the type of laundry care appliance used and/or the laundry care program implemented.

In combination with the determined high temperature value of the drum drive, a corresponding high level value of the washing liquid in the lye container, determined by the control during the overheat detection time period, enables the control to draw the following conclusion: the drum drive is overstressed by the level of washing liquid in the lye container being too high.

For this reason, the control activates the pump during a matching time interval following the overheat detection time interval in order to pump the washing liquid out of the lye container and thereby reduce the level of the washing liquid in the lye container.

By correspondingly reducing the level of the washing liquid in the lye container, the resistance of the laundry drum against rotation by the washing liquid is reduced, whereby the load of the drum drive and thus the temperature of the drum drive can be reduced.

Laundry care appliances are understood as appliances for laundry care, such as washing machines or laundry dryers. Such laundry care appliances are understood in particular as household laundry care appliances. I.e. laundry care appliances used in the household category and for treating a common amount of laundry in the household.

In an advantageous embodiment, the control unit is configured for: during the matching time period, when the temperature detected by the drum drive during the overheat detection time period is above a temperature threshold and the level of the washing liquid in the lye container detected during the overheat detection time period is above a level threshold, the drum drive is activated to rotate the laundry drum at the matching rotational speed and the pump is activated to pump the washing liquid out of the lye container.

In addition to the washing liquid being pumped out of the lye container, this achieves the technical advantage that the rotation of the laundry drum at a suitable rotational speed also effectively reduces the load on the drum drive and thus the temperature of the drum drive.

By adapting the rotational speed of the laundry drum during the adaptation time period, a particularly advantageous distribution of the laundry in the laundry drum can be achieved, whereby unbalance of the laundry drum and power peaks of the drum drive caused by said unbalance can be reduced.

The control unit is in particular configured for activating the drum drive during the matching time interval to rotate the laundry drum at an increased rotational speed, wherein the increased rotational speed is increased relative to a standard rotational speed of a previous laundry care program. The standard rotational speeds of the previous laundry care programs include in particular rotational speeds which are equal to or less than the contact rotational speed at which the laundry received in the laundry drum contacts the rotating laundry drum.

The laundry drum is rotated at an increased rotational speed during the mating time period, during which the laundry received in the laundry drum is particularly evenly abutted against the rotating laundry drum and thus the occurrence of laundry agglomerations in the laundry drum is reduced, since the increased rotational speed is greater than the standard rotational speed of the previous laundry care program. As a result, the laundry is applied as a uniform laundry ring to the rotating laundry drum and the power peaks of the drum drive, which are caused by unbalance, can be reduced.

In particular, the increased rotational speed is 1.3 to 1.5 times the standard rotational speed of the previous laundry care program, in particular the abutment rotational speed. If the abutment 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 unit is configured for: during the matching time period, when the temperature of the drum drive detected during the overheat detection time period is higher than a temperature threshold value and the level of the washing liquid in the lye container detected during the overheat detection time period is higher than a level threshold value and the electrical power parameter of the drum drive detected by the control, in particular the motor current and/or the motor torque, is higher than a power threshold value, the pump is activated to pump the washing liquid from the lye container and in particular the drum drive is also activated to rotate the laundry drum at the matching rotational speed.

This achieves the technical advantage that by taking into account the electrical power parameters of the drum drive, in particular the motor current and/or the motor torque, further parameters are provided to the control unit, which further parameters enable the control unit to determine that the drum drive is likely to be exposed to an overheating hazard during the overheat detection time period.

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

In an advantageous embodiment, the control unit is configured for: during the matching time period, when the drum drive rotates the laundry drum at the matching rotational speed, the pump is activated to pump the washing liquid out of the lye container.

This achieves the technical advantage that the pump pumps the washing liquid out of the lye container only when the matching rotational speed of the laundry drum is reached during the matching time interval, so that a particularly advantageous pumping out of the washing liquid out of the lye container is ensured.

In an advantageous embodiment, the control unit is configured for: during the matching time period, the pump is deactivated again when the second level of the washing liquid in the lye container detected during the matching time period is equal to or smaller than the level threshold value.

This achieves the technical advantage that the control unit deactivates the pump again during the matching time period when the level of the washing liquid in the lye container drops sufficiently. In this way the matching time interval is kept as short as possible.

In an advantageous embodiment, the control unit is configured for: during a level check time section following the matching time section, when a third level of the washing liquid in the lye container detected during the level check time section is higher than a second level threshold value, wherein the second level threshold value is greater than the first level threshold value, the control is configured for deactivating the drum drive during the level check time section so that the laundry drum does not rotate during the level check time section.

This achieves the technical advantage that during the level checking time period, the movement of the washing liquid received in the lye container ends as the laundry drum does not rotate, so that the washing liquid collects in the lower region of the lye container and thus enables a particularly effective re-measurement of the liquid level.

If the third level value detected during the level verification time period is greater than the second level threshold value, the pump is re-activated during the level verification time period to pump wash liquid out of the lye container in order to further reduce the level of wash liquid in the lye container.

In an advantageous embodiment, the control is configured for activating the drum drive to rotate the laundry drum at a suitable rotational speed during a rotation time interval following the level detection time interval, wherein in particular a further level detection time interval follows the rotation time interval.

This achieves the technical advantage that during the rotation time section following the level detection time section, for example, an effective removal of additional washing liquid from the laundry is achieved.

In an advantageous embodiment, the control unit is configured for repeating the level detection time section until a third level of the washing liquid detected during the level detection time section is less than the second level threshold value.

This achieves the technical advantage that by iteratively repeating the level detection time section it is ensured that the pump for pumping the washing liquid out of the lye container is in an active state until the third level of the washing liquid detected during the level detection time section is below the second level threshold value.

In an advantageous embodiment, the control is configured for activating the drum drive during a temperature check time section following the level check time section and/or the rotation time section to rotate the laundry drum at a standard rotational speed of the laundry care program stored in the control, wherein the control is configured for detecting a temperature increase of the drum drive during the temperature check time section by means of the temperature sensor.

This achieves the technical advantage that a possible overheating of the drum drive, which may still be present at all times, is detected by the control during the temperature test time period, or alternatively can be ensured by the control as a function of the detected temperature increase, the possible overheating of the drum drive can be effectively prevented by the preceding steps and the laundry care program can then be continued at the standard rotational speed.

The temperature increase is reflected in particular by the quotient Δt/Δt, wherein Δt corresponds here to the duration of the temperature test time section, wherein Δt corresponds here to the difference between the maximum detected temperature and the minimum detected temperature during the temperature test time section.

In an advantageous embodiment, the control unit is configured for: during a second matching time interval following the temperature test time interval, when the temperature detected during the temperature test time interval exceeds the temperature rise limit value, the pump is activated to pump washing liquid out of the lye container and in particular also the drum drive is activated to rotate the laundry drum at the matching rotational speed.

This achieves the technical advantage that by comparing the temperature increase detected during the temperature test time period with a temperature increase limit value, an advantageous criterion can be made by the control unit whether the drum drive is at risk of overheating.

If the temperature detected during the temperature test time period exceeds the temperature rise limit value, the drum drive is exposed to an overheating hazard and the control reacts to this by implementing a second matching time period during which the pump pumps the washing liquid again and during which the laundry drum in particular also rotates at the matched rotational speed again.

In an advantageous embodiment, the control unit is configured for: during a second level check time section following the second matching time section, when the fourth level of the washing liquid in the lye container detected during the second level check time section is higher than a third level threshold value, the pump is activated to pump the washing liquid out of the lye container and in particular also the drum drive is activated to rotate the laundry drum at the matching rotational speed, wherein the third level threshold value is greater than the second level threshold value.

In this way, the technical advantage is achieved that within the framework of the second level detection time section, it can be advantageously determined by the control unit whether the activation of the pump during the second matching time section is sufficient to sufficiently lower the level of the washing liquid in the lye container.

In an advantageous embodiment, the control is configured for activating the drum drive during a second temperature test time section following the second level test time section to rotate the laundry drum at a standard rotational speed of the laundry care program stored in the control, wherein the control is configured for detecting a temperature increase of the drum drive during the second temperature test time section by means of the temperature sensor.

This achieves the technical advantage that the risk of overheating of the drum drive can be evaluated again by the control unit within the framework of the second temperature test time interval.

In an advantageous embodiment, the control unit is configured for: when the temperature rise detected during the second temperature test time period exceeds the temperature rise limit value, the drum drive is deactivated and a warning is sent to a warning output of the laundry care appliance.

This achieves the technical advantage that, when the temperature rise detected during the second temperature test time period again exceeds the temperature rise limit value, a fault may occur in the laundry care appliance, which fault requires manual intervention by the user or service technician.

In an advantageous embodiment, the control unit is configured for: during a conventional laundry care section immediately following the temperature check time section or the second temperature check time section, when the temperature increase detected during the first or second temperature check time section is equal to or less than the temperature increase limit value, the laundry care program stored in the control section is implemented and the drum driving means is activated to rotate the laundry drum at the standard rotational speed of the laundry care program stored in the control section.

This achieves the technical advantage that the laundry care program can be continued conventionally when the temperature increase detected during the first or second temperature test time period is equal to or less than the temperature increase limit value, since the drum drive is no longer exposed to a risk of overheating.

According to a second aspect, the object of 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: an alkaline solution container for receiving a washing solution; a liquid level sensor for detecting a liquid level of the washing liquid in the lye container; a laundry drum for receiving laundry, wherein the laundry drum is arranged in the lye container; a drum driving device for rotating the laundry drum; a temperature sensor for detecting a temperature of the drum driving device; a pump for pumping the washing liquid from the lye container; and a control unit which is connected to the drum drive, the liquid level sensor, the temperature sensor and the pump in terms of control technology, wherein the method comprises the following method steps: during the overheat detection time period, the temperature of the drum drive is detected by the control by means of a temperature sensor and the level of the washing liquid in the lye container is detected by means of a level sensor; during a matching time interval following the overheat detection time interval, when the temperature of the drum drive detected during the overheat detection time interval is above a temperature threshold and the level of the washing liquid in the lye container detected during the overheat detection time interval is above a level threshold, the pump is activated by the control to pump the washing liquid out of the lye container in order to avoid overheating of the drum drive.

An embodiment according to the first aspect which is indicated as advantageous for the laundry care appliance is likewise an advantageous embodiment for the method according to the second aspect.

Drawings

The drawings show:

FIG. 1 is a schematic view of a laundry care appliance;

FIG. 2 is a schematic view of a laundry care appliance having a control portion;

FIG. 3 is a schematic diagram of a laundry care process according to one embodiment; and

fig. 4 is a schematic view of a method for avoiding overheating of a drum driving device in a laundry care appliance according to an embodiment.

Detailed Description

Fig. 1 shows a schematic view of a conventional laundry care appliance 100, such as a washing machine. The laundry care appliance 100 comprises a wash-in box 101 into which wash care substances, such as detergents or other liquid substances, can be injected into the wash-in box 101. The laundry care appliance 100 has an appliance housing 102. The laundry care appliance 100 comprises a door 103 for loading the laundry care appliance 100 with laundry.

Fig. 2 shows a schematic view of a laundry care appliance with a control part. The laundry care appliance 100 has an alkaline liquor container 105 for receiving a washing liquor and has a laundry drum 107 for receiving laundry. The laundry drum 107 is arranged in the lye container 105. The laundry care appliance 100 has a drum drive 109 for rotating the laundry drum 107. The lye container 105 has a discharge opening 111. The discharge opening 111 is fluidly connected to a pump 117 via a liquid line 115. The pump 117 can pump washing liquid from the lye container 105 into the liquid line 115 through the discharge opening 111 and further out of the laundry care appliance 100 through the output line 125 during a pumping-out process, which is not shown in fig. 2.

The laundry care appliance 100 has a washing liquid supply 118-1 for supplying washing liquid into the lye container 105, wherein the washing liquid supply 118-1 is connected to the lye container 105 via a supply line 118-2.

In particular, the washing liquid supply 118-1 comprises the wash-in box 101 of the laundry care appliance 100, which is not shown in fig. 2, and/or a fresh-water connection of the laundry care appliance 100, which is not shown in fig. 2, wherein the control 119 of the laundry care appliance 100 is configured for activating the washing liquid inflow via the wash-in box 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 lye container 105.

The laundry care appliance 100 has a level sensor 120 arranged in the lye container 105, which is configured for detecting the level of the washing liquid in the lye container 105, wherein the level sensor 120 is connected to the control 119 in terms of control technology.

The laundry care appliance 100 further has a temperature sensor 123 for detecting the temperature of the drum drive 109, wherein the temperature sensor 123 is connected to the control unit 119 in terms of control technology. The temperature sensor 123 is arranged in particular in or on the drum drive 109.

The laundry care appliance 100 further comprises a control part 119 which is connected to the pump 117, to the drum drive 109, to the washing liquid supply 118-1, to the liquid level sensor 120 and to the temperature sensor 123, respectively, via a control connection 121.

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

The first curve 127 shown in fig. 3 shows along the ordinate axis 129 the temperature of the drum drive 109 of the laundry care appliance 100, which is detected by the temperature sensor 123, over time, which is plotted along the abscissa axis 131.

The further illustrations shown in fig. 3 each show the level 133 of the washing liquid in the lye container 105 of the laundry care appliance 100 in a respective different time section.

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

During the overheat detection time section 141, the control portion 119 performs a laundry care program, and activates the drum driving device 109 so as to rotate the laundry drum 107 at the standard rotation speed 143 of the laundry care program stored in the control portion 119.

The respective standard rotational speed 143 corresponds to a washing rotational speed which is preferably equal to or less than the contact rotational speed of the laundry drum 107, at which the laundry received in the laundry drum 107 is exactly contacted on the laundry drum 107.

As shown according to the first curve 127, the temperature sensor 123 detects the temperature of the drum drive 109 during the overheat detection time section 141. Furthermore, the level sensor 120 detects the level 133 of the washing liquid in the lye container 105 during the overheat detection time section 141, as is shown in the left-hand illustration.

The control unit 119 recognizes that the temperature detected by the drum driving device 109 at the end of the overheat detection time section 141 is higher than the temperature threshold 145. The temperature threshold 145 is slightly below the limiting temperature threshold 147, in particular about 10 ℃ below the limiting temperature threshold, in order to ensure that damage to the drum drive 109 is avoided when the temperature threshold 145 is reached. The temperature threshold 145 and the limiting temperature threshold 147 are stored in the control unit 119 in a predetermined manner, in particular as a function of the type of laundry care appliance and/or as a function of the laundry care program to be implemented.

Furthermore, the control 119 recognizes that the detected washing liquid level 133 (only schematically shown in fig. 3) at the end of the overheat detection time section 141 is higher than the liquid level threshold. The fluid level threshold value is stored in the control unit 119 in a predetermined manner, in particular as a function of the type of laundry care appliance and/or the laundry care program to be 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 control 119 activates the pump 117 to pump washing liquid out of the lye container 105 and activates the drum drive 109 to rotate the laundry drum 107 at the matched rotational speed 151 during the matching time section 149 following the overheat detection time section 141.

As can be seen from fig. 3, the corresponding matching rotational speed 151 is higher than the contact rotational speed and is in this case, in particular, 1.3 to 1.5 times the contact rotational speed as a function of the size of the laundry drum 107 and the loading of the laundry drum 107. For example, if the contact rotational speed is 60 revolutions per minute, the suitable rotational speed 151 is, for example, between 80 revolutions per minute and 90 revolutions per minute.

By rotating the laundry drum 107 during the matching time period 149 at a matching rotational speed 151 that is increased compared to the standard rotational speed 143, a particularly advantageous uniform contact of the laundry on the laundry drum 107 is achieved, as a result of which possible unbalance can be avoided and a particularly uniform rotational characteristic of the laundry drum 107 and, as a result, a particularly uniform power profile of the drum drive 109 can be ensured.

Furthermore, by pumping the washing liquid out of the lye container 105 during the matching time period 149, the rotational resistance of the rotating laundry drum 107 caused by the washing liquid is reduced, whereby the power consumption of the drum drive 109 can likewise be reduced.

The control unit 119 is configured in particular for: during the matching time section 149, when the drum drive 109 rotates the laundry drum 107 at the matching rotational speed 151, the pump 117 is activated to pump wash liquid out of the lye container 105.

In order to keep the user of the laundry care appliance 100 free from the pump noise volume, it may be particularly advantageous to keep the pumping out process during the matching time section 149 as short as possible. The control unit 119 is configured in particular for: during the matching time section 149, the pump 117 is again deactivated when the second level 133 of the washing liquid in the lye container 105 detected during the matching time section 149 is equal to or smaller than the level threshold.

Next, the control portion 119 is configured to: during a level verification time section 153 following the matching time section 149, when the third level 133 of the washing liquid in the lye container 105 detected during the level verification time section 153 is higher than a second level threshold value, wherein the second level threshold value is larger than the first level threshold value, the pump 117 is activated to pump the washing liquid out of the lye container 105. The control 119 is configured for deactivating the drum drive 109 during the level check time section 153 in order to prevent the laundry drum 107 from rotating during the level check time section 153.

By stopping the operation of the laundry drum 107 during the level checking time section 153 to ensure that the washing liquid is in a non-moving state, an effective level measurement can be performed during the level checking time section 153.

When the third level 133 of the washing liquid in the lye container 105 detected during the level verification time section 153 is higher than a second level threshold value, which is larger than the first level threshold value, the pump 117 is activated for pumping the washing liquid out of the lye container 105.

The control 119 is configured here for activating the drum drive 109 to rotate the laundry drum 107 at the matched rotational speed 151 during a rotation time segment 155 following the level check time segment 153, wherein in particular a further level check time segment 153 follows the rotation time segment 155.

The control unit 119 is configured to repeat the level detection time section 153 until the third level 133 of the washing liquid detected during the level detection time section 153 is less than the second level threshold value.

The control 119 is configured here for activating the drum drive 109 to rotate the laundry drum 107 at the standard rotational speed 143 of the laundry care program stored in the control 119 during a temperature test time period 157 following the liquid level test time period 153 and/or the rotation time period 155. The control unit 119 is configured to detect a temperature increase of the drum drive 109 by means of the temperature sensor 123 during the temperature test time section 157.

As shown in fig. 3, the control unit 119 determines the temperature increase by the quotient Δt/Δt, wherein Δt here corresponds to the duration of the temperature test time section 157, wherein Δt here corresponds to the difference between the maximum detected temperature and the minimum detected temperature during the temperature test time section 157.

Here, the control portion 119 is configured to: during a second matching time interval 159 following the temperature check time interval 157, when the temperature increase detected during the temperature check time interval 157 exceeds the temperature increase limit value, the pump 117 is activated to pump washing liquid out of the lye container 105 and the drum drive 109 is activated to rotate the laundry drum 107 at the matching rotational speed 151.

The control portion 119 is configured to: during a second level verification time section 161 following the second matching time section 159, when the fourth level 133 of the washing liquid in the lye container 105 detected during the second level verification time section 161 is higher than a third level threshold value, wherein the third level threshold value is larger than the second level threshold value, the pump 117 is activated to pump the washing liquid out of the lye container 105. The control unit 119 is configured to repeat the second level detection time section 163 until the fourth level 133 of the washing liquid detected during the level detection time section 163 is less than the third level threshold.

The control 119 is configured for activating the drum drive 109 during a second temperature check time section 163 following the second liquid level check time section 161 to rotate the laundry drum 107 at the standard rotational speed 143 of the laundry care program stored in the control 119, wherein the control 119 is configured for detecting a temperature increase of the drum drive 109 during the second temperature check time section 163 by means of the temperature sensor 123.

The control portion 119 is configured to: during a conventional laundry care section, which is immediately following the second temperature-checking time section 163 and is not shown in fig. 3, when the temperature increase detected during the temperature-checking time section is equal to or less than the temperature increase limit value, the laundry care program stored in the control portion 119 is implemented and the drum drive 109 is activated to rotate the laundry drum 107 at the standard rotational speed 143 of the laundry care program stored in the control portion 119.

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

However, the control portion 119 is configured to: when the temperature rise detected during the second temperature checking time section 163 exceeds the temperature rise limit value, the drum driving device 109 is deactivated and a warning is sent to the warning output device of the laundry care appliance 100.

In this case, a warning to the user is meaningful in order to enable interruption of the laundry care program and to ensure that the drum driving device 109 is not damaged due to overheating.

Fig. 4 illustrates a schematic diagram of a method for avoiding overheating of a drum drive in a laundry care appliance, according to one embodiment.

The method 200 comprises as a first method step: the temperature of the drum drive 109 is detected 201 by the control 119 during the overheat detection time period 141 by means of the temperature sensor 123 and the level 133 of the washing liquid in the lye container 105 by means of the level sensor 120.

The method 200 comprises as a second method step: during a matching time section 149 following the overheat detection time section 141, when the temperature of the drum drive 109 detected during the overheat detection time section 141 is above a temperature threshold 145 and the level 133 of the washing liquid in the lye container 105 detected during the overheat detection time section 141 is above a level threshold, the pump 117 is activated 203 by the control 119 to pump the washing liquid out of the lye container 105 in order to avoid overheating of the drum drive 109.

All the features explained and shown in connection with the individual embodiments of the invention can be arranged in different combinations in the subject matter according to the invention in order to achieve their advantageous effect at the same time.

The scope of the invention is not limited to the features illustrated in the description or shown in the drawings.

Reference numerals

100. Clothes care appliance

101. Flushing box

102. Appliance shell

103. Appliance door

105. Alkali liquor container

107. Clothes drum

109. Roller driving device

111. Discharge opening

115. Liquid pipeline

117. Pump with a pump body

118-1 washing liquid supply device

118-2 supply line

119. Control unit

120. Liquid level sensor

121. Control connection part

123. Temperature sensor

125. Output pipeline

127. First curve of

129. About the ordinate axis of the first curve

131. About the axis of abscissa of the first curve

133. Level of washing liquid in lye container

135. Second curve

137. About the ordinate axis of the second curve

139. About the axis of abscissa of the second curve

141. Overheat detection time zone

143. Standard rotation speed

145. Temperature threshold

147. Threshold of limit temperature

149. Matching time segments

151. Matched rotational speed

153. Liquid level inspection time zone

155. Rotating time segments

157. Temperature checking time zone

159. Second matching time zone

161. Second liquid level inspection time zone

163. Second temperature test time zone

200. Method for avoiding overheating of a drum drive

201. The first method step: detecting temperature and liquid level

203. The second method step: activating a pump

Claims

1. A laundry care appliance (100) having: an alkaline liquid container (105) for receiving a washing liquid (129); a level sensor (120) for detecting a level (133) of a washing liquid in the lye container (105); a laundry drum (107) for receiving laundry, wherein the laundry drum (107) is arranged in the lye container (105); a drum driving device (109) for rotating the laundry drum (107); a temperature sensor (123) for detecting the temperature of the drum driving device (109); a pump (117) for pumping wash liquid out of the lye container (105); and a control unit (119) which is connected to the drum drive (109), the liquid level sensor (120), the temperature sensor (123) and the pump (117) in terms of control technology,

the control unit (119) is designed to detect the temperature of the drum drive (109) by means of the temperature sensor (123) and the level (133) of the washing liquid in the lye container (105) by means of the level sensor (120) during a overheat detection time period (141),

the control section (119) is configured to: during a matching time section (149) following the overheat detection time section (141), when the temperature of the drum drive (109) detected during the overheat detection time section (141) is above a temperature threshold (145) and the level (133) of the washing liquid in the lye container (105) detected during the overheat detection time section (141) is above a level threshold, the pump (117) is activated to pump washing liquid out of the lye container (105) in order to avoid overheating of the drum drive (109).

2. The laundry care appliance (100) according to claim 1, characterized in that the control portion (119) is configured for: during the matching time section (149), when the temperature of the drum drive (109) detected during the overheat detection time section (141) is above the temperature threshold (145) and the level (133) of the washing liquid in the lye container (105) detected during the overheat detection time section (141) is above the level threshold, the drum drive (109) is activated to rotate the laundry drum (107) at the matching rotational speed (151) and the pump (117) is activated to pump the washing liquid out of the lye container (105).

3. The laundry care appliance (100) according to claim 1 or 2, characterized in that the control portion (119) is configured for: during the matching time section (149), when the temperature of the drum drive (109) detected during the overheat detection time section (141) is higher than the temperature threshold (145) and the level (133) of the washing liquid in the lye container (105) detected during the overheat detection time section (141) is higher than the level threshold and the electrical power parameter, in particular the motor current and/or the motor torque, detected by the control (119) of the drum drive (109) is higher than the power threshold, the pump (117) is activated to pump the washing liquid from the lye container (105) and in particular the drum drive (109) is also activated to rotate the laundry drum (107) at the matching rotational speed (151).

4. A laundry care appliance (100) according to claim 2 or 3, characterized in that the control portion (119) is configured for: during the matching time section (149), when the drum drive (109) rotates the laundry drum (107) at the matching rotational speed (151), the pump (117) is activated to pump wash liquid out of the lye container (105).

5. The laundry care appliance (100) according to any of the preceding claims, characterized in that the control portion (119) is configured for: -during the matching time section (149), when the second level (133) of the washing liquid in the lye container (105) detected during the matching time section (149) is equal to or smaller than the level threshold value, disabling the pump (117) again.

6. The laundry care appliance (100) according to any of the preceding claims, characterized in that the control portion (119) is configured for: -activating the pump (117) to pump wash liquid out of the lye container (105) during a level verification time section (153) following the matching time section (149), when a third level (133) of wash liquid in the lye container (105) detected during the level verification time section (153) is higher than a second level threshold, wherein the second level threshold is larger than the first level threshold,

wherein the control (119) is configured for deactivating the drum drive (109) during the level check time section (153) in order to prevent the laundry drum (107) from rotating during the level check time section (153).

7. Laundry care appliance (100) according to claim 6, characterized in that the control (119) is configured for activating the drum drive (109) to rotate the laundry drum (107) at the matched rotational speed (151) during a rotation time section (155) following the level checking time section (153), wherein in particular a further level checking time section (153) follows the rotation time section (155).

8. The laundry care appliance (100) according to claim 6 or 7, characterized in that the control part (119) is configured for repeating the level verification time section (153) until a third level (133) of washing liquid detected during the level verification time section (153) is smaller than the second level threshold value.

9. Laundry care implement (100) according to any one of the preceding claims, characterized in that the control (119) is configured for activating the drum drive (109) during a temperature check time section (157) following the level check time section (153) and/or a rotation time section (155) to rotate the laundry drum (107) at a standard rotational speed (143) of a laundry care program stored in the control (119), wherein the control (119) is configured for detecting a temperature increase of the drum drive (109) by means of the temperature sensor (123) during the temperature check time section (157).

10. The laundry care appliance (100) according to claim 9, characterized in that the control portion (119) is configured for: during a second matching time section (159) following the temperature test time section (157), when the temperature increase detected during the temperature test time section (157) exceeds a temperature increase limit value, the pump (117) is activated to pump washing liquid out of the lye container (105) and in particular also the drum drive (109) is activated to rotate the laundry drum (107) at the matching rotational speed (151).

11. The laundry care appliance (100) according to claim 10, characterized in that the control portion (119) is configured for: during a second level check time section (161) following the second matching time section (159), when a fourth level (133) of washing liquid in the lye container (105) detected during the second level check time section (161) is higher than a third level threshold, the pump (117) is activated to pump washing liquid out of the lye container (105) and in particular the drum drive (109) is also activated to rotate the laundry drum (107) at the matching rotational speed (151), wherein the third level threshold is greater than the second level threshold.

12. The laundry care appliance (100) according to claim 11, characterized in that the control part (119) is configured for activating the drum drive (109) during a second temperature check time section (163) following the second level check time section (161) to rotate the laundry drum (107) at a standard rotational speed (143) of a laundry care program stored in the control part (119), wherein the control part (119) is configured for detecting a temperature increase of the drum drive (109) by means of the temperature sensor (123) during the second temperature check time section (163).

13. The laundry care appliance (100) according to claim 12, characterized in that the control portion (119) is configured for: when the temperature detected during the second temperature test time period (163) exceeds the temperature rise limit value, the drum drive (109) is deactivated and a warning is sent to a warning output of the laundry care appliance (100).

14. The laundry care appliance (100) according to any one of claims 9 to 13, characterized in that the control portion (119) is configured for: during a conventional laundry care section immediately following the temperature check time section (157) or the second temperature check time section (163), when the temperature increase detected during the first temperature check time section or the second temperature check time section (157, 163) is equal to or less than the temperature increase limit value, a laundry care program stored in the control section (119) is implemented and the drum drive (109) is activated to rotate the laundry drum (107) at a standard rotational speed (143) of the laundry care program stored in the control section (119).

15. A method (200) for avoiding overheating of a drum drive (109) in a laundry care appliance (100), wherein the laundry care appliance (100) has: an alkaline liquid container (105) for receiving a washing liquid (129); a level sensor (120) for detecting a level (133) of a washing liquid in the lye container (105); a laundry drum (107) for receiving laundry, wherein the laundry drum (107) is arranged in the lye container (105); a drum driving device (109) for rotating the laundry drum (107); a temperature sensor (123) for detecting the temperature of the drum driving device (109); a pump (117) for pumping wash liquid out of the lye container (105); and a control unit (119) which is connected to the drum drive (109), the liquid level sensor (120), the temperature sensor (123) and the pump (117) in a control technology, characterized in that the method (200) comprises the following method steps:

during an overheat detection time period (141), the temperature of the drum drive (109) is detected (201) by the control (119) by means of the temperature sensor (123) and the level (133) of the washing liquid in the lye container (105) is detected by means of the level sensor (120);

during a matching time section (149) following the overheat detection time section (141), when the temperature of the drum drive (109) detected during the overheat detection time section (141) is above a temperature threshold (145) and the level (133) of the washing liquid in the lye container (105) detected during the overheat detection time section (141) is above a level threshold, the pump (117) is activated (203) by the control (119) to pump washing liquid out of the lye container (105) in order to avoid overheating of the drum drive (109).