EP3481986B1 - Laundry treating apparatus with a control device - Google Patents

Description

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

In conventional laundry care devices, the laundry drum is rotated by a drum drive at a maximum rotation speed during a washing process. Here, the maximum rotation speed of the laundry drum can be controlled by controlling the laundry care device, for example depending on the weight of the laundry or the selected laundry care program of the laundry care device. Such a control of the maximum rotation speed of the laundry drum does not necessarily enable laundry care that is gentle on the laundry. If laundry has become jammed in the laundry drum, the drum drive will, for example, try to reach the maximum rotation speed, which increases the torque of the laundry drum loaded with laundry and which can damage the laundry under certain circumstances.

In the DE 43 10 595 A1 discloses a washing machine with a laundry drum which is accelerated in one direction of rotation to a first speed below a system speed and in another direction of rotation to a second speed above the system speed.

In the FR 2 655 363 discloses a washing machine with a washing drum, which is rotated depending on the weight of the laundry in the washing drum.

The disclosure DE 37 36 809 A1 describes a method and a device for drum load measurement, especially in household washing machines and spin dryers.

It is the object on which the invention is based to specify a laundry care device which enables a laundry care process which is gentle on the laundry.

This object is achieved 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 one aspect, the object according to the invention is achieved by a laundry care device with a laundry drum for receiving laundry, a drum drive for rotating the laundry drum, with a torque detection device for detecting a torque of the laundry drum and a controller for controlling the drum drive, the controller being designed To drive the drum drive during a rotation time interval in order to rotate the laundry drum at a first rotation speed when the detected torque falls below a torque threshold, wherein the controller is designed to drive the drum drive during the rotation time interval to rotate the laundry drum at a second rotation speed when the detected Torque exceeds the torque threshold, wherein the second rotation speed is less than the first rotation speed, and wherein the controller is configured, the second rotation ns speed depending on the detected torque of the laundry drum to avoid damage to the laundry in the laundry drum.

This has the technical advantage that when the torque threshold is exceeded by the detected torque, the rotational speed is reduced in order to avoid damage to the laundry in the laundry drum.

If laundry is jammed in the laundry drum, the torque increases when the laundry drum rotates and the laundry in the laundry drum can be damaged under certain circumstances. If the detected torque falls below the torque threshold value, the laundry drum can be rotated at a maximum first rotation speed during a rotation speed control of the control by the drum drive, in order to ensure an advantageous laundry care of the laundry during the laundry care process.

If, however, the detected torque exceeds the torque threshold value, the control changes from the rotation speed control to the torque control, the laundry drum being rotated by the drum drive with a second rotation speed that is reduced compared to the maximum first rotation speed. The controller controls the second one Rotation speed as a function of the detected torque of the laundry drum loaded with laundry. Damage to the laundry due to items of laundry jammed in the laundry drum can thereby be avoided.

Thus, on the one hand, the control can ensure effective and efficient laundry care when the laundry drum rotates at the maximum first rotation speed and, on the other hand, very gentle laundry care when the laundry drum rotates at a reduced second rotation speed by the laundry care device. In particular, the forces acting on the laundry are reduced in order to avoid damage to the laundry during the washing process.

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

In an advantageous embodiment of the laundry care device, the controller is designed to increase the second rotation speed to the first rotation speed during the rotation time interval if the detected torque falls below the torque threshold value, and the controller is designed to reduce the first rotation speed to the second rotation speed during the rotation time interval if the detected torque exceeds the torque threshold.

This achieves the technical advantage that the control enables a dynamic control of the rotational speed of the laundry drum loaded with laundry as a function of the detected torque. Thus, in a trouble-free laundry care process, the laundry drum can be operated at the maximum first rotation speed in order to enable particularly advantageous laundry care. On the other hand, if a piece of laundry is jammed in the laundry drum and the associated torque rises above the torque threshold, the control reduces the maximum first rotation speed to the second reduction speed in order to achieve a particularly gentle laundry care. If the detected torque falls below the torque threshold again in the course of the wash cycle, the rotation speed of the laundry drum can be increased again to the maximum first rotation speed. In this way, particularly effective and gentle laundry care can be ensured.

In a further advantageous embodiment of the laundry care device, the control is designed to increase the second rotational speed to the first rotational speed or to reduce the first rotational speed to the second rotational speed if the detected torque falls below the torque threshold value by a torque difference value or if the detected torque falls below the torque threshold value exceeds the torque difference value.

This achieves the technical advantage that the controller avoids changing the first and second rotational speeds too frequently. If the detected torque is close to the torque threshold, there may be a repeated change between the first and second rotational speeds with a slight increase or decrease in the detected torque. The torque difference value ensures that a change between the first and second rotational speeds only occurs if the detected torque significantly exceeds or falls below the torque threshold value.

In a further advantageous embodiment of the laundry care device, the laundry care device has a weight detection device for detecting a weight of laundry in the laundry drum, the laundry care device has, and / or has, a tub for receiving washing liquid and a level sensor for detecting a level of washing liquid in the tub the laundry care device has a humidity sensor for detecting a humidity value within the laundry care device, the controller being designed to determine the second rotational speed as a function of the detected torque of the laundry drum and the detected weight of the laundry, the to control the detected level of washing liquid in the tub and / or the detected humidity value.

This achieves the technical advantage that, through the detected weight of the laundry, the detected fill level of washing liquid in the tub and / or the detected humidity value of the control, different parameters are available to control the second rotational speed particularly advantageously when the detected torque exceeds the torque threshold. This ensures particularly gentle laundry care.

In a further advantageous embodiment of the laundry care device, the laundry care device has a program selection device for selecting a plurality of selectable laundry care programs, and the controller is designed to control the first rotation speed as a function of the selected laundry care program, and / or the controller is designed to control the second rotation speed to be controlled as a function of the detected torque of the laundry drum and of the selected laundry care program.

This achieves the technical advantage that the user of the laundry care device can make a preselection by selecting the laundry care program, for example whether particularly sensitive laundry, such as Silk or wool textiles is used. As a result, the controller can take into account the selected laundry care program when controlling the first and second rotational speeds and thus ensure a particularly advantageous control of the drum drive.

In a further advantageous embodiment of the laundry care device, the torque threshold value is a predetermined torque threshold value.

This achieves the technical advantage that the controller can easily and quickly determine whether the detected torque falls below or exceeds the predetermined torque threshold value. The predetermined torque threshold value can be determined, for example, by various reference measurements using a specific type of laundry care device.

In a further advantageous embodiment of the laundry care device, the laundry care device has a weight detection device for detecting a weight of laundry in the laundry drum, and / or the laundry care device has a suds container for receiving washing liquid and a temperature sensor for detecting a temperature of washing liquid in the suds container, wherein the controller is designed to determine the torque threshold value as a function of the detected weight of the laundry or the detected temperature of the washing liquid.

This achieves the technical advantage that dynamic control of the torque threshold enables particularly effective laundry care, since the maximum first rotational speed is reduced to the second rotational speed only if the increase in torque exceeds the dynamically determined torque threshold due to jamming of the laundry in the laundry drum is based.

In a further advantageous embodiment of the laundry care device, the laundry care device has a program selection device for selecting a plurality of selectable laundry care programs, and the controller is designed to determine the torque threshold value as a function of the selected laundry care program.

This has the technical advantage that dynamic control of the torque threshold value as a function of the selected laundry care program enables effective control of the rotational speed both by the control and by the user.

In a further advantageous embodiment of the laundry care device, the controller is designed to detect the rotation speed of the laundry drum, the controller being designed to deactivate the drum drive or to control the drum drive in order to rotate the laundry drum with an opposite direction of rotation if the detected rotation speed has a rotation speed threshold value falls below.

This achieves the technical advantage that the laundry care process can be interrupted if the laundry gets jammed particularly strongly in the laundry drum, or the blocking of the laundry drum can be released by changing the direction of rotation. If the laundry drum is heavily blocked by laundry and a particularly high torque, the detected rotational speed of the laundry drum can drop below the rotational speed threshold value. Damage to the laundry can be avoided by stopping the rotation of the laundry drum or rotating the laundry drum in an opposite direction.

In a further advantageous embodiment of the laundry care device, the torque detection device has a power detection device for detecting an electrical power value of the drum drive, the controller being designed to control the second rotational speed as a function of the detected electrical power value.

This achieves the technical advantage that the power detection device for detecting an electrical power value of the drum drive ensures a particularly effective detection of the torque of the laundry drum, since the torque is proportional to the electrical line value. The control can thus advantageously determine the corresponding torque of the laundry drum from the detected electrical power value.

In a further advantageous embodiment of the laundry care device, the power detection element comprises a current sensor for detecting a supply current of the drum drive.

This achieves the technical advantage that a particularly advantageous determination of the torque of the laundry drum is made possible by the detection of the supply current of the drum drive by the current sensor.

According to a second aspect of the invention, the object is achieved by a method for controlling a drum drive of a laundry care appliance, the A laundry care device comprises a laundry drum for holding laundry, a drum drive for rotating the laundry drum, a torque detection device for detecting a torque of the laundry drum and a controller for controlling the drum drive, the method comprising the following steps, first actuation of the drum drive during a rotation time interval around the Rotate the drum at a first rotational speed when the sensed torque falls below a torque threshold, second driving the drum drive during the rotation time interval to rotate the laundry drum at a second rotational speed when the sensed torque exceeds a torque threshold, the second rotational speed being less than the first Rotation speed, and controlling the second rotation speed depending on the detected torque of the laundry drum to prevent damage to the Avoid washing in the laundry drum.

The technical advantage is thereby achieved that the control ensures a particularly advantageous control of the rotation speed of the laundry drum as a function of the detected torque of the laundry drum.

In a further embodiment of the method, the laundry care device has a program selection device for selecting a plurality of selectable laundry care programs, the method comprising controlling the second rotational speed as a function of the detected torque of the laundry drum loaded with laundry and of the selected laundry care program.

This achieves the technical advantage that controlling the rotational speed as a function of a manually selected laundry care program enables particularly effective laundry care.

In a further embodiment of the method, the first actuation of the drum drive during the rotation time interval comprises reducing the first rotation speed to the second rotation speed, if that is detected Torque exceeds the torque threshold, and the second actuation of the drum drive during the rotation time interval includes increasing the second rotation speed to the first rotation speed when the detected torque falls below the torque threshold.

This achieves the technical advantage that a dynamic change between the first rotation speed and the second rotation speed can be made possible during the rotation time interval.

In a further embodiment of the method, the first actuation comprises reducing the first rotational speed to the second rotational speed if the detected torque exceeds the torque threshold value by a torque difference value, and the second actuation comprises increasing the second rotational speed to the first rotational speed if the acquired torque falls below the torque threshold by a torque difference value.

This achieves the technical advantage that a change between the first and second rotational speeds can only be carried out if there is a significant change in the torque threshold value.

Fig. 1

eine schematische Ansicht eines Wäschepflegegeräts;

Fig. 2

eine schematische Ansicht eines Wäschepflegegeräts mit einer Steuerung zum Steuern eines Trommelantriebs des Wäschepflegegeräts;

Fig. 3

eine graphische Darstellung eines Rotationsvorgangs einer Wäschetrommel in einem Wäschepflegegerät;

Fig. 4

eine graphische Darstellung einer Drehmomentänderung während eines Rotationsvorgangs einer Wäschetrommel in einem Wäschepflegegerät; und

Fig. 5

einen Ablauf eines Verfahrens zum Steuern eines Trommelantriebs des Wäschepflegegeräts.

Further embodiments are explained with reference to the accompanying drawings. Show it:

Fig. 1

a schematic view of a laundry care device;

Fig. 2

is a schematic view of a laundry care device with a controller for controlling a drum drive of the laundry care device;

Fig. 3

a graphic representation of a rotation process of a laundry drum in a laundry care device;

Fig. 4

a graphic representation of a torque change during a rotation process of a laundry drum in a laundry care device; and

Fig. 5

a sequence of a method for controlling a drum drive of the laundry care device.

Fig. 1 shows a schematic view of a general laundry care appliance 100, such as a washing machine. The laundry care device 100 comprises a induction bowl 101, into which washing care substance, such as, for example, detergent, can be filled. The laundry care device 100 comprises a door 103 for loading the laundry care device 100 with laundry.

Fig. 2 shows a schematic view of a laundry care device with a controller for controlling a drum drive of the laundry care device. The laundry care appliance 100 comprises a suds container 105 for holding washing liquid and a laundry drum 107 arranged in the suds container 105 for holding laundry 109.

The tub 105 has a drain opening 111, which is arranged on an underside of the tub 105. The drain opening 111 is connected to a line 113. A pump 115 for pumping washing liquid through line 113 is arranged in line 113. The pump 115 is designed to pump washing liquid out of the drain opening 111 from the tub 105 and to pump out the pumped washing liquid through the line 113 and through an outlet opening 117 from the laundry care appliance 100. The pump 115 is connected by a pump connection 119 to a controller 121 of the laundry care device 100. The controller 121 is designed to control the pump 115.

The laundry care appliance 100 also has a drum drive 123 for rotating the laundry drum 107, which is designed to rotate the laundry drum 107 at different rotational speeds. The drum drive 123 is connected to the controller 121 by a drum connection 125. The controller 121 is designed to control the drum drive 123.

The laundry care appliance 100 also has a torque detection device 127 for detecting a torque of the laundry drum 107. The Torque detector 127 is connected to controller 121 through a device connection 129 and is connected to drum drive 123 through a drum drive connection 130.

The laundry care device 100 also has a program selection device 131 for selecting a plurality of selectable laundry care programs. The program selection device 131 is connected to the controller 121 through a selection connection 133.

In conventional laundry care devices 100, the rotation speed of the laundry drum 107 is controlled as a function of specific inputs. The most important inputs are in particular the type of textile for laundry 109 and the type of laundry care program selected. In laundry care devices 100, the laundry drum 107 is rotated at a maximum rotation speed during a laundry care program. The maximum rotation speed can either be predetermined or regulated dynamically. With a dynamically regulated maximum rotation speed, the maximum rotation speed may depend on the weight of the laundry 109 in the laundry drum 107, on the temperature of washing liquid in the tub 105, the air humidity or on a manual input by the user.

The disadvantage of controlling the maximum rotation speed in conventional laundry care devices 100 is that a reduction in the rotation speed of the laundry drum 107 does not necessarily mean that the laundry care process for the laundry 109 is carried out gently. If laundry 109 has become jammed in the laundry drum 107, the drum drive 123 will, for example, attempt to reach the maximum rotational speed, which increases the torque of the laundry drum 107 loaded with laundry 109 and which may damage the laundry 109 under certain circumstances.

In the laundry care device 100 according to the invention, the controller 121 is designed to actuate the drum drive 123 during a rotation time interval as part of a rotation speed control in order to rotate the laundry drum 107 at a maximum first rotation speed when this is done by the Torque detection device 127 detects torque of laundry drum 107 loaded with laundry 109 falls below a torque threshold value.

However, if the detected torque exceeds the torque threshold value, the controller 121 reduces the maximum first rotational speed of the laundry drum 107 to a second rotational speed, which is lower than the first rotational speed, as part of a torque check. In this torque control case, the controller 121 is designed to control the second rotational speed as a function of the detected torque of the laundry drum 107 loaded with laundry 109 in order to avoid damage to the laundry 109 in the laundry drum 107.

If the speed of rotation again falls below the torque threshold in the case of torque control, the controller 121 can switch from the torque control to the rotation speed control in order to drive the laundry drum 107 again at the maximum first rotation speed, whereby, however, the controller 121 ensures that during the rotation speed control the detected torque does not exceed the torque threshold. However, if the sensed torque again exceeds the torque threshold, the controller 121 switches from the rotational speed control to the torque control again and the first rotational speed is reduced again to the second rotational speed.

If the detected torque of the laundry drum 107 moves within a narrow range around the torque threshold value, a hysteresis can be introduced in order to avoid the control 121 changing the torque control and the rotation speed control too frequently. In this case, the controller 121 increases the second rotational speed only to the first rotational speed if the detected torque falls below the torque threshold value by a torque difference value, or the controller 121 only reduces the first rotational speed to the second rotational speed if the detected torque is one Torque difference value exceeds. If the Torque difference value has a sufficient size, it can be prevented that switching between the rotational speed control and the torque control too often.

Thus, with an increasing torque, which can be caused in particular by a piece of laundry jammed in the laundry drum 107, the controller 121 can reduce the maximum first rotation speed to the second rotation speed in order to avoid damage to the laundry 109 in the laundry drum 107.

Here, the torque threshold can include a predetermined or a dynamic torque threshold. In the case of a dynamic torque threshold value, the controller 121 can determine the torque threshold value, for example, as a function of the weight of the laundry 109 detected by a weight detection device and / or as a function of a temperature of the washing liquid detected by a temperature sensor. In the case of a dynamic torque threshold value, the controller 121 can also take into account the laundry care program selected by the user by means of a program selection device 131 when determining the torque threshold value. Thus, for example, the torque threshold value can also change during a laundry care process and, for example, have different values in the laundry drum 107 for dry and moist laundry 109.

In addition, the controller 121 may be configured to detect the rotation speed of the laundry drum 107 and to deactivate the drum drive 123 or to drive the drum drive 123 in order to drive the laundry drum 107 in an opposite direction of rotation if the detected rotation speed falls below a rotation speed threshold value. This ensures that if the rotational speed drops sharply below the rotational speed threshold value, it can be ensured that, by deactivating the drum drive 123 or changing the direction of rotation of the laundry drum 107, laundry 109 which may be jammed on the laundry drum 107 can be released again safely, thereby damaging the Laundry 109 can be avoided.

The advantage of the laundry care device 100 according to the invention lies in particular in that a corresponding control of the rotational speed of the laundry drum 107 enables a particularly effective and at the same time gentle laundry care process which avoids or at least reduces damage to sensitive laundry items. By the torque-dependent control of the rotation speed of the laundry drum 107, a slow change in the rotation speed of the laundry drum 107 can be ensured, as a result of which the laundry 109 can be turned in the laundry drum 107 particularly gently. If the torque detection device 127 comprises a power detection element for detecting an electric power of the drum drive 123, a further sensor can also be dispensed with. Furthermore, the torque-dependent control of the rotational speed can be activated or deactivated by the user of the laundry care device 100 if necessary in order to achieve particularly gentle laundry care for the laundry 109.

Fig. 3 shows a graphical representation of a rotation process of a laundry drum in a laundry care device. Fig. 3 shows a temporal representation of the rotational speed of the laundry drum 107, and the torque of the laundry drum 107, which are plotted along the ordinate axis 135 as a function of the time which is indicated along the abscissa axis 137.

The first curve 139 shows the course of the rotational speed of the laundry drum 107. The second curve 141 shows the course of the torque of the laundry drum 107.

According to the in Fig. 3 The illustrated embodiment shows different time segments 143, 145, 147, 149, 151, 153 of a rotation time interval. In the first, second, and third time periods 143, 145, 147, the controller 121 controls the drum drive 123 according to the rotation speed control in order to rotate the laundry drum 107 at a first maximum rotation speed 155, the torque not exceeding the torque threshold value 157.

At the end of the third time segment 147, the torque exceeds the torque threshold value 157. The controller 121 changes here from the Rotation speed control on the torque control. The controller 121 controls the drum drive 123 in order to rotate the laundry drum 107 at a second rotational speed, which is lower than the maximum, first rotational speed 155. During the fourth and fifth time period 149, 151, the torque control is active and the controller 121 controls the second rotational speed as a function of the detected torque of the laundry drum 107 loaded with laundry 109. The torque threshold value 157 is not exceeded, thereby preventing damage to the laundry 109 can be.

During the fifth time period 153, the detected torque falls below the torque threshold value 157, as a result of which the controller 121 changes from the torque control back to the rotational speed control and the second rotational speed of the laundry drum 107 is increased again to the first, maximum rotational speed 155.

Fluctuations in the rotational speeds around the first rotational speed or fluctuations in the torque around the torque threshold value 157 are possible here during different rotation time intervals during a wash cycle. In this case, the controller 121 can compensate for the fluctuations by taking a feedback control into account or by using reference values.

Fig. 4 shows a graphical representation of a torque change during a rotation process of a laundry drum 107 in a laundry care device. Here shows Fig. 4 in particular a temporal representation of the supply current of the drum drive 123 of the laundry care appliance 100, which is plotted along the ordinate axis 135 as a function of the time which is indicated along the abscissa axis 137. Here, the torque of the laundry drum 107 is proportional to the supply current of the drum drive 123 and the torque detection device 127 comprises a power detection device for detecting an electrical power value of the drum drive 123. The laundry drum 107 has a laundry load of 5 kg and is corresponding to the drum drive 123 Rotation speed control of the controller 121 driven at a first rotation speed 155 of 50 revolutions per minute.

The third curve 159 shows the course of the supply current of the drum drive 123. As shown in the third curve 159, the supply current of the drum drive 123 changes significantly during the washing cycle. The torque proportional to the supply current of the drum drive 123 of the laundry drum 107 loaded with laundry 109 thus also changes significantly. The significant change in torque results from the different compression of the laundry 109 between the laundry drum 107, the housing of the laundry care appliance 100 and the door 103.

Fig. 5 shows a sequence of a method for controlling a drum drive of the laundry care device, which according to the embodiments of the Fig. 2 , Fig. 3 and Fig. 4 is described.

The method 200 includes the first actuation 201 of the drum drive 123 during a rotation time interval in order to rotate the laundry drum 107 at a first rotation speed 155 when the detected torque falls below a torque threshold value 157. The method 200 includes the second actuation 203 of the drum drive 123 during the rotation time interval in order to rotate the laundry drum 107 at a second rotation speed when the detected torque exceeds a torque threshold value 157, the second rotation speed being less than the first rotation speed 155. The method 200 includes controlling 205 the second rotational speed as a function of the detected torque of the laundry drum 107 loaded with laundry 109 in order to avoid damage to the laundry 109 in the laundry drum 107.

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

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

Reference list

100

Laundry care appliance

101

Induction bowl

103

door

105

Suds container

107

Laundry drum

109

Laundry

111

Drain opening

113

management

115

pump

117

Discharge opening

119

Pump connection

121

control

123

Drum drive

125

Drum connection

127

Torque detection device

129

Facility connection

130

Drum drive connection

131

Program selector

133

Selection link

135

Ordinate axis

137

Axis of abscissa

139

First curve

141

Second curve

143

First period

145

Second period

147

Third period

149

Fourth period

151

Fifth period

153

Sixth period

155

First rotation speed

157

Torque threshold

159

Third curve

200

Method for controlling a drum drive of a laundry care device

201

First process step: first activation of the drum drive

203

Second process step: second control of the drum drive

Claims (13)

1. Laundry care appliance (100) with a laundry drum (107) for holding laundry, a drum drive (123) for rotating the laundry drum (107), with a torque detection facility (127) for detecting a torque of the laundry drum (107) and a controller (121) for controlling the drum drive (123), characterised in that
   the controller (121) is configured to control the drum drive (123) during a rotation period, in order to rotate the laundry drum (107) at a first rotation speed (155), if the detected torque is below a torque threshold value (157), and
   the controller (121) is configured to control the drum drive (123) during the rotation period, in order to rotate the laundry drum (107) at a second rotation speed, if the detected torque exceeds the torque threshold value (157), wherein
   the second rotation speed is slower than the first rotation speed (155) and wherein the controller (121) is configured to control the second rotation speed as a function of the detected torque of the laundry drum (107), in order to prevent damage to the laundry (109) in the laundry drum (107).
2. Laundry care appliance (100) according to claim 1, characterised in that the controller (123) is configured to increase the second rotation speed to the first rotation speed (155) during the rotation period, if the detected torque is below the torque threshold value (157), and the controller (121) is configured to reduce the first rotation speed (155) to the second rotation speed during the rotation period, if the detected torque exceeds the torque threshold value (157).
3. Laundry care appliance (100) according to claim 2, characterised in that the controller (121) is configured to increase the second rotation speed to the first rotation speed (155) or reduce the first rotation speed (155) to the second rotation speed, if the detected torque drops to a differential torque value below the torque threshold value (157) or if the detected torque exceeds the torque threshold value (157) by the differential torque value.
4. Laundry care appliance (100) according to one of the preceding claims, characterised in that the laundry care appliance (100) has a weight detection facility for detecting a weight of laundry (109) in the laundry drum (107), the laundry care appliance (100) has a tub (105) for holding washing liquid and a fill level sensor for detected a fill level of washing liquid in the tub (105) or the laundry care appliance (100) has an air humidity sensor for detecting an air humidity value within the laundry care appliance (100), wherein the controller (121) is configured to control the second rotation speed as a function of the detected torque of the laundry drum (107), as well as the detected weight of the laundry, the detected fill level of washing liquid in the tub (105) or the detected air humidity value.
5. Laundry care appliance (100) according to one of the preceding claims, characterised in that the laundry care appliance (100) has a program selection facility (131) for selecting a plurality of selectable laundry care programs and the controller (121) is configured to control the first rotation speed (155) as a function of the selected laundry care program or the controller (121) is configured to control the second rotation speed as a function of the detected torque of the laundry drum (107) and the selected laundry care program.
6. Laundry care appliance (100) according to one of the preceding claims, characterised in that the torque threshold value (157) is a predetermined torque threshold value (157).
7. Laundry care appliance (100) according to one of the preceding claims, characterised in that the controller (121) is configured to detect the rotation speed of the laundry drum (107), wherein the controller (121) is configured to deactivate the drum drive (123) or to control the drum drive (123), in order to rotate the laundry drum (107) in a counter rotation direction, if the detected rotation speed is below a rotation speed threshold value.
8. Laundry care appliance (100) according to one of the preceding claims, characterised in that the torque detection facility (127) has a power detection facility for detecting an electrical power value of the drum drive (123), wherein the controller (121) is configured to control the second rotation speed as a function of the detected electrical power value.
9. Laundry care appliance (100) according to claim 8, characterised in that the power detection element comprises a current sensor for detecting a supply current to the drum drive (123).
10. Method (200) for controlling a drum drive (123) of a laundry care appliance (100), wherein the laundry care appliance (100) has a laundry drum (107) for holding laundry, a drum drive (123) for rotating the laundry drum (107), a torque detection facility (127) for detecting a torque of the laundry drum (107) and a controller (121) for controlling the drum drive (123), characterised in that the method comprises the following steps:

    first control (201) of the drum drive (123) during a rotation period, in order to rotate the laundry drum (107) at a first rotation speed (155), if the detected torque is below a torque threshold value (157),

    second control (203) of the drum drive (123) during the rotation period, in order to rotate the laundry drum (107) at a second rotation speed, if the detected torque exceeds the torque threshold value (157), wherein

    the second rotation speed is slower than the first rotation speed (155), and

    controlling (205) the second rotation speed as a function of the detected torque of the laundry drum (107), in order to prevent damage to the laundry (109) in the laundry drum (107).
11. Method (200) according to claim 10, characterised in that the laundry care appliance (100) has a program selection facility (131) for selecting a plurality of selectable laundry care programs and the method (200) comprises controlling (205) the second rotation speed as a function of the detected torque of the laundry drum (107) loaded with laundry (109) and the selected laundry care program.
12. Method (200) according to claim 10 or 11, characterised in that the first control (201) of the drum drive (123) during the rotation period comprises reducing the first rotation speed (155) to the second rotation speed, if the detected torque exceeds the torque threshold value (157), and the second control (203) of the drum drive during the rotation period comprises increasing the second rotation speed to the first rotation speed (155), if the detected torque is below the torque threshold value (157).
13. Method (200) according to claim 12, characterised in that the first control (201) comprises reducing the first rotation speed (155) to the second rotation speed, if the detected torque exceeds the torque threshold value (157) by a differential torque value, and the second control (203) comprises increasing the second rotation speed to the first rotation speed (155), if the detected torque is the differential torque value below the torque threshold value (157).

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