KR20210128779A - Drum whashing machine and control method for drum washing machine - Google Patents

Abstract

An embodiment relates to a dehydration apparatus and method of a drum washing machine, and more particularly, to a dehydration apparatus and method of a drum washing machine that measure the fabric type of laundry and perform a dehydration cycle differently according to the fabric type to save the time and energy used for dehydrating laundry.

Description

DRUM WHASHING MACHINE AND CONTROL METHOD FOR DRUM WASHING MACHINE

The embodiment relates to a drum washing machine and a control method of the drum washing machine, and more particularly, to a drum washing machine and a control method of the drum washing machine in which a spin-drying section is changed according to laundry.

In general, a washing machine is a device for processing laundry through various actions such as washing, dehydration and/or drying. The washing machine includes a tub containing water and a drum rotatably provided in the tub, and a plurality of through holes through which water passes are formed in the drum.

In the washing machine, when a user selects a desired course using a control panel in a state in which laundry such as clothes or bedding is put in the drum, a preset algorithm is executed in response to the selected course, thereby supplying/discharging, washing, rinsing, and dehydrating. etc. are carried out.

The washing operation is generally divided into a washing operation, a rinsing operation, and a dehydration operation. The progress of this process can be confirmed through a display provided on the control panel.

In the washing cycle, detergent is supplied along with water into the drum, and the chemical action of the detergent and the physical action caused by the rotation of the pulsator and/or the drum are used to remove the stains on the fabric.

In the rinsing cycle, clean water in which detergent is not dissolved is supplied into the drum to rinse the fabric. In particular, the detergent absorbed in the fabric is removed during the washing cycle. During the rinsing cycle, a fabric softener is sometimes supplied along with water.

In the dewatering cycle, after the rinsing cycle is completed, the drum is rotated at high speed to dehydrate the fabric. In general, as the dehydration cycle is completed, all operations of the washing machine are terminated. However, in the case of a washing machine combined with drying, a drying cycle may be further added after the spin-drying cycle.

The washing operation of the washing machine is set according to the amount of laundry put into the drum. For example, the water supply level, washing intensity, drainage time, spin-drying time, etc. are set according to the amount of laundry.

However, washing performance and dewatering performance vary not only depending on the amount of laundry but also the quality of the fabric, and when only the amount of laundry is considered in setting the washing operation, sufficient washing performance and dehydration performance cannot be expected.

For example, in the case of a material that drains water well, even if the amount of laundry is large, sufficient dehydration is possible even in a short time. Even if the amount of laundry is detected as low, it requires a longer dehydration time. Therefore, it is necessary to determine the fabric according to the degree of dehydration and configure the setting of the dehydration cycle in an appropriate manner according to the fabric.

In the case of conventional washing-drying washing machines, the spin-drying time is usually determined only by the amount of laundry. However, this method has a limitation in reflecting the fabric characteristics of laundry in dehydration, and thus there is a problem in that unnecessary dehydration time and energy are input for fabrics that dry well.

In the drum washing machine and the control method of the drum washing machine according to the embodiment, time and energy required for dehydration of laundry can be reduced by reflecting the cloth characteristics of laundry in dehydration.

The embodiment relates to a drum washing machine performing a washing cycle and a spin-drying cycle, wherein the washing cycle includes a first sensing section for sensing a first weight of the laundry, and the spin-drying cycle measures a second weight of the laundry and a second sensing section, wherein the drum washing machine measures the dehydration degree of the laundry using a drum in which the laundry is stored and rotated, a driving unit rotating the drum, and the first and second weights, A fabric sensing unit for discriminating the fabric of the laundry using the measured dehydration degree, and controlling the driving unit to perform the washing and dehydration processes, and in the spin-drying process, the RPM of the drum according to the differentiated fabric. and a control unit for changing the operation time, wherein the first weight is the weight measured before washing the laundry, and the second weight is the weight of the laundry measured after rotating the drum according to the sensed RPM, The time is the time during which the dewatering stroke is performed. By performing the spin-drying process differently according to the fabric of the laundry, time and energy required for the spin-drying process can be saved.

In addition, the cloth sensing unit according to an embodiment determines the cloth quality of the laundry as the first cloth when the dehydration degree is less than the preset reference dehydration degree, and sets the cloth quality of the laundry to the second cloth when the dehydration degree is the same as the reference dehydration degree. It is determined as a cloth, and when the dehydration degree exceeds the reference degree of dehydration, it is determined that the cloth of the laundry is a third cloth, and the control unit, in the dehydration process, the first cloth, the second cloth, and the The driving unit is controlled so that the RPM increases and the operation time increases according to the order of the third posi. By distinguishing the fabric using the dehydration degree, it is possible to reduce the time of the dehydration cycle for laundry that discharges water well, and reduce energy consumption by driving the drum at a low RPM.

In addition, the dehydration stroke according to the embodiment includes a first dehydration section, a second dehydration section, and a third dehydration section, and the control unit rotates the drum according to a first RPM in the first dehydration section, The driving unit is controlled to rotate the drum according to a second RPM in the second spin-drying section, and rotate the drum according to a third RPM in the third spin-dry section. By setting the RPM according to the dehydration section, unnecessary energy consumption can be prevented.

In addition, the sensing RPM according to the embodiment is lower than the first RPM, the first RPM is lower than the second RPM, and the second RPM is lower than the third RPM. By sequentially increasing the RPM for each section, laundry made of a material that drains easily can consume less energy, and laundry made of a material that does not drain well can consume a lot of energy to perform a dehydration cycle.

In addition, the dehydration cycle according to the embodiment sequentially includes a first dehydration section, a second dehydration section, and a third dehydration section, and the control unit according to the embodiment includes the second dehydration section when it is determined that the first dehydration section is used. Thereafter, the dehydration cycle is terminated. In the case of the first cloth that drains water well, the dehydration cycle can be performed with a small dewatering time.

In addition, the control unit according to the embodiment, when it is determined that the second cloth, after performing some sections of the third dehydration section, ends the dewatering process. In the case of the second cloth, energy and time can be saved by performing a dehydration cycle for a shorter time than that of the third cloth.

In addition, the control unit according to the embodiment, when it is determined that the third cloth, ends the dewatering process after the third dehydration section. In the case of the third cloth, which does not drain water well, dehydration is carried out during the longest dehydration time so that dehydration can be performed efficiently.

In addition, the dehydration stroke according to the embodiment further includes a first stop section, a second stop section, and a third stop section, wherein the first stop section is disposed between the second detection section and the first dehydration section, , The second stop section is disposed between the first dehydration section and the second dehydration section, the third stop section is disposed between the second dehydration section and the third dehydration section, and the control unit comprises: The driving unit is controlled so that the RPM becomes 0 in the first stop section, the second stop section, and the third stop section. By having a stop section, the laundry inside the drum is mixed evenly. Therefore, the laundry inside the drum is evenly dehydrated.

In addition, the control unit according to an embodiment rotates the drum from 0 RPM to the first RPM in the first spin-drying section, and in the second spin-dry section, the drum rotates from 0 RPM to the second RPM. rotating the drum, and rotating the drum from 0 RPM to the third RPM in the third dehydration section, and the RPM in each of the first dehydration section, the second dehydration section, and the third dehydration section When the preset reference RPM is reached, the driving unit is controlled to maintain the RPM as the reference RPM for a second preset time, and the second time may vary according to the preset RPM value.

In addition, an embodiment provides a control method of a drum washing machine that performs a washing cycle and a spin-drying cycle, in a first sensing section, measuring a first weight of laundry, in a second sensing section, measuring a second weight of the laundry measuring, measuring the dehydration degree of the laundry using the measured first weight and the measured second weight, and distinguishing the fabric of the laundry using the measured dehydration degree, and the changing the RPM and operating time of the drum according to the differentiated fabric in the dehydration cycle, wherein the first detection section is included in the washing cycle, and the second detection section is included in the spin-drying cycle, The first weight is the weight of the laundry before washing, the second weight is the weight of the laundry measured after rotating the drum according to the sensed RPM, and the operation time is the time during which the spin-drying process is performed. By performing the spin-drying process differently according to the fabric of the laundry, time and energy required for the spin-drying process can be saved.

In addition, the step of distinguishing the fabric of the laundry using the dehydration degree according to the embodiment includes determining the fabric of the laundry as the first fabric when the dehydration degree is less than a preset reference dehydration degree, the dehydration degree is Determining the fabric of the laundry as the second fabric when the same as the reference dehydration degree; and determining the fabric of the laundry as the third fabric when the dehydration degree exceeds the reference dehydration degree; In the step of changing the RPM and operating time of the drum according to It includes the step of controlling the By distinguishing the fabric using the dehydration degree, it is possible to reduce the time of the dehydration cycle for laundry that discharges water well, and reduce energy consumption by driving the drum at a low RPM.

In addition, the dehydration cycle according to the embodiment includes a first dehydration section, a second dehydration section, and a third dehydration section, and the step of changing the RPM and operating time of the drum according to the fabric quality includes: Rotating the drum according to a first RPM, rotating the drum according to a second RPM in the second spin-drying section, and controlling the drum to rotate according to a third RPM in the third spin-drying section do. By setting the RPM according to the dehydration section, unnecessary energy consumption can be prevented.

In addition, the sensing RPM according to the embodiment is lower than the first RPM, the first RPM is lower than the second RPM, and the second RPM is lower than the third RPM. By sequentially increasing the RPM for each section, laundry made of a material that drains easily can consume less energy, and laundry made of a material that does not drain well can consume a lot of energy to perform a dehydration cycle.

In addition, the dehydration cycle according to the embodiment includes a first dehydration section, a second dehydration section, and a third dehydration section sequentially, and the step of changing the RPM and operating time of the drum according to the cloth quality includes the first The method further includes the step of terminating the dehydration cycle after the first dehydration section and the second dehydration section when it is determined that it is porous. In the case of the first cloth that drains water well, the dehydration cycle can be performed with a small dewatering time.

In addition, the step of changing the RPM and operating time of the drum according to the cloth according to the embodiment includes the step of terminating the spin-drying process after performing only some sections of the third dehydration section when it is determined that the second cloth is used. include more For laundry that drains water well, the time of the spin-drying cycle can be reduced, and energy consumption can be reduced by driving the drum at a low RPM.

In addition, the step of changing the RPM and operating time of the drum according to the cloth according to the embodiment further includes the step of terminating the spin-drying process after the third dehydration section when it is determined that the third cloth is used. In the case of the third cloth, which does not drain water well, dehydration is carried out during the longest dehydration time so that dehydration can be performed efficiently.

In addition, the dehydration stroke according to the embodiment further includes a first stop section, a second stop section, and a third stop section, wherein the first stop section is disposed between the second detection section and the first dehydration section, , the second stop section is disposed between the first dehydration section and the second dehydration section, and the third stop section is disposed between the second dehydration section and the third dehydration section, and according to the The step of changing the RPM and the operating time of the drum further includes setting the RPM to 0 in the first stop section, the second stop section, and the third stop section. By having a stop section, the laundry inside the drum is mixed evenly. Therefore, the laundry inside the drum is evenly dehydrated.

In addition, the step of changing the RPM and operating time of the drum according to the fabric includes rotating the drum from 0 RPM to the first RPM in the first dehydration section, in the second dehydration section, the rotating the drum from 0 RPM to the second RPM, rotating the drum from 0 RPM to the third RPM in the third spin-drying section, and the first spin-drying section, the second When the RPM reaches a preset reference RPM value in each of the spin-drying section and the third spin-drying section, the method further includes controlling the driving unit so that the RPM rises again after maintaining the RPM for a second preset time, , the second time may be changed according to the set RPM value.

The drum washing machine and the control method of the drum washing machine according to the embodiment can reduce the time and energy required for dehydration according to the fabric of laundry.

1 is a cross-sectional view of a drum washing machine according to an embodiment.
2 is a block diagram illustrating a main configuration of a drum washing machine according to an embodiment.
3 is a graph showing the degree of dehydration for each tissue according to the embodiment.
4 is a block diagram of a washing process and a spin-drying process according to an embodiment.
5 is a block diagram of a dewatering process (S400) according to the embodiment.
6 is an RPM graph for each section of a three-stage dewatering stroke according to an embodiment.
7 is a schematic diagram showing the pressure for each position of the laundry according to the embodiment.
Fig. 8 is a block diagram of a dewatering process of the first cloth according to the embodiment.
9 is a graph showing the RPM for each section during the dehydration stroke of the first cloth according to the embodiment.
10 is a block diagram of a dehydration process of the second cloth according to the embodiment.
11 is a graph showing the RPM for each section during the dehydration stroke of the second cloth according to the embodiment.
12 is a block diagram of a dehydration process of the third cloth according to the embodiment.
13 is a graph showing the RPM of the dehydration stroke of the third cloth according to the embodiment.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar reference numerals are assigned to the same or similar components, and overlapping descriptions thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have a meaning or role distinct from each other by themselves. In addition, in describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, the configuration of the drum washing machine will be described with reference to FIG. 1 .

1 is a cross-sectional view of a drum washing machine according to an embodiment.

Referring to FIG. 1 , a drum washing machine 1 according to the embodiment includes a cabinet 110 forming an exterior, a tub 120 installed inside the cabinet 110 to store washing water, and the tub 120 . It may include a drum 130 rotatably installed from the inside, a supply unit 140 , a drain unit 150 , and a motor 161 for driving the drum 130 .

The cabinet 110 includes a main body 111 forming side surfaces, a rear surface and a bottom surface, a front plate 112 forming a front surface, and a top plate 113 coupled to an upper portion of the main body 111 to form an upper surface of the main body. can be composed of

The inlet 112a may be formed in the front plate 112 to put laundry in. The inlet 112a is opened and closed by the door 115 installed in the cabinet 110 .

The tub 120 may be formed in a cylindrical shape, and may include a tub inlet 120a to allow laundry to enter and exit. The upper part of the tub 120 is supported by the hanging spring 121 on the upper part of the cabinet 110 , and the lower part of the tub 120 is supported by the friction damper 122 , so that when the drum 130 rotates at high speed. Reduces vibrations generated in the drum washing machine (1).

The heater 123 may be installed on one lower side of the tub 120 to control the water temperature of the wash water, and a temperature sensor (not shown) is installed on one lower side of the tub 120 to measure the water temperature of the wash water. The electrode sensor 124 may be installed on one lower side of the tub 120 in order to detect the conductivity of the wash water.

The drum 130 may be formed in a cylindrical shape, and may include a drum inlet 130a to allow laundry to enter and exit.

The inlet (112a), the tub inlet (120a), and the drum inlet (130a) are provided to be connected.

The lifter 131 is installed on the inner circumferential surface of the drum 130 to raise the laundry put into the drum 130 to a predetermined position, and a plurality of through-holes 132 allow washing water from the drum 130 in a washing operation such as dehydration. It may be formed on the inner peripheral surface of the drum 130 so as to escape.

The water supply unit 140 may be provided on the lower side of the tub 120, and is installed on the water supply hose 141 and the water supply hose 141 so as to supply water from an external water source to the inside of the tub 120. It may include a water supply valve 142 for controlling entry and exit, and a detergent supply device 143 that can store detergent and injects water supplied through the water supply hose 141 into the tub 120 together with the detergent.

The drain unit 150 may be provided under the tub 120, a drain hose 151 for discharging wash water used for washing and rinsing to the outside, and a drain pump 152 connected to the drain hose 151 ) and a bellows hose 153 connecting between the drain pump 152 and the lower portion of the tub 120 .

The pressure transmission tube 154 may be connected to the bellows hose 153 , and the end of the pressure transmission tube 154 may be installed higher than the water level stored in the tub 120 .

The water level sensor 155 is connected to the end of the pressure transmission tube 154 in order to detect the water level in the tub 120 through the pressure change in the tub 120 . The water level sensor 155 may be installed at a position higher than the water level stored in the tub 120 .

In the water level sensor 155 , the higher the water level inside the tub 120 , the lower the detected water level frequency, and the lower the water level inside the tub 120 , the higher the sensed water level frequency.

The motor 161 may be mounted on the rear of the tub 120 , and the motor 161 may rotate the drum 130 by being coupled to the drum 130 through the rotation shaft 162 .

Hereinafter, a control method of the drum washing machine 1 will be described with reference to FIG. 2 .

2 is a block diagram showing the main configuration of the drum washing machine 1 according to the embodiment.

Referring to FIG. 2 , the washing machine 1 according to the embodiment may include a control unit 200 , a water supply unit 140 , a drainage unit 150 , a driving unit 160 , and a cloth sensor 170 , and the control unit Reference numeral 200 controls the operations of the water supply unit 140 , the drainage unit 150 , the driving unit 160 , and the cloth sensor 170 .

The water supply unit 140 supplies washing water to the drum 130 when the washing and rinsing operations are performed, and the drain unit 150 operates to allow the washing water to escape from the drum 130 .

The driving unit 160 includes a motor 161 and a rotating shaft 162 , and rotates the drum 130 . In addition, the driving unit 160 causes the drum 130 to operate at a specific RPM.

The cloth sensor 170 measures the weight of the laundry before washing. That is, the weight of the laundry in a dry state is measured as the first weight. Then, the weight of the laundry is measured after the laundry is rotated at the sensing RPM. That is, the weight of the laundry dehydrated by rotating at the sensing RPM is measured as the second weight.

The cloth sensor 170 measures a first weight, which is the weight of the laundry in a dry state, and a second weight, which is the weight of the laundry in a state rotated at the sensing RPM. Then, the dehydration degree of the laundry is measured using the first weight and the second weight. The degree of dehydration may be defined as in Equation 1 below.

[Equation 1]

Dehydration (RMC, %) = (second weight - first weight)/first weight

Here, the first weight means the weight when the laundry is in a dry state, and the second weight means the weight after spin-drying of the laundry.

Since the degree of dehydration is measured differently depending on the fabric of laundry, the fabric of laundry can be classified using the degree of dehydration. The laundry classification according to the degree of dehydration will be described in detail with reference to FIG. 3 to be described later.

The control unit 200 controls the operations of the water supply unit 140 , the drainage unit 150 , the driving unit 160 , and the cloth sensor 170 . Specifically, the control unit 200 controls the water supply unit 140 and the drain unit 150 so that the washing water required to perform the washing or dehydration operation is supplied to and discharged from the drum 130 .

In addition, the control unit 200 may control the driving unit 160 so that the drum 130 rotates at a constant RPM, and may change the spin-drying cycle according to the cloth quality of the laundry measured by the cloth sensor 170 .

Hereinafter, a method for classifying laundry fabric according to an embodiment will be described with reference to FIG. 3 .

3 is a graph showing the degree of dehydration for each tissue according to the embodiment.

Referring to FIG. 3 , the x-axis of the graph indicates porosity, and the y-axis indicates the degree of dehydration. A represents the dehydration degree of the polyester laundry, B represents the dehydration when the polyester laundry and the cotton laundry are mixed, and C represents the dehydration degree of the cotton laundry. At this time, the laundry weight of A, B, and C is the same as 8lb.

First, in the case of A, a value of 27.4% is measured on average when measuring dehydration. For B, an average of 48.2% dehydration is measured, and for C, an average of 57.3% dehydration is measured. In case of B, the deviation of the measured value may be significantly measured depending on the mixing ratio of polyester and cotton. As the polyester-based material contains more than the cotton material, the dehydration degree is measured closer to A. That is, the dehydration degree is measured to be low. As the cotton material contains more than the polyester-based material, the degree of dehydration close to C is measured. That is, the degree of dehydration is measured to be high.

Polyester laundry has low dehydration compared to cotton laundry, which does not drain water relatively well. In other words, polyester laundry discharges water well and has lower dehydration than cotton laundry. Washing made of cotton does not drain water well and has a higher dehydration than laundry made of polyester.

When the dehydration cycle is performed simply by considering only the amount of cloth, the same dehydration cycle is performed regardless of the fabric. In this case, the laundry made of polyester material that drains water well and laundry made of cotton material that does not drain water well perform the same dehydration cycle. Therefore, there is a problem in that unnecessary time and energy are consumed for dehydration of laundry made of polyester material.

In order to solve this problem, the embodiment measures the degree of dehydration to distinguish the fabric of laundry, and controls the time of the dehydration cycle according to the fabric to efficiently perform dehydration.

The cloth detecting unit 170 compares the preset reference dehydration and the dehydration measured using Equation (1). When the measured dehydration degree is lower than the reference dehydration degree, it is classified as the first cloth, if it is the same as the reference dehydration degree, it is classified as the second cloth, and when it is higher than the standard dehydration level, it is classified as the third cloth.

In the case of the first cloth, the laundry is made of a material that drains easily compared to the second and third cloths, and the third cloth is laundry made of a material that does not drain well compared to the first and second cloths. Therefore, in the case of the first tissue, it has a lower RPM and a shorter dehydration time compared to the second and third foams, the second foam has a lower RPM and a shorter dehydration time than the third foam, and the third foam has the highest RPM. and the longest dehydration time.

For example, the first cloth is a cloth for laundry having a high polyester-based content, the second cloth is a cloth for laundry in which a polyester-based material and a cotton material are mixed, and the third cloth is laundry with a high content of cotton material. corresponds to the foreskin of

Accordingly, the first cloth, which is a cloth from which water is easily discharged, can perform the dehydration process with little energy and time. The third sieve, which is poorly drained of water, uses a lot of energy and time so that dehydration is performed efficiently.

The reference dehydration degree may be set to a value within a certain range based on 48.2%, but the embodiment is not limited thereto, and may be set to an appropriate range in order to classify the first, second, and third cells.

Hereinafter, a washing process and a spin-drying process according to the embodiment will be described with reference to FIG. 4 .

4 is a block diagram of a washing process and a spin-drying process according to an embodiment.

Referring to FIG. 4 , the washing cycle ( S300 ) includes a first sensing section ( S310 ) and a washing section ( S320 ).

In step S310, the weight of the laundry before washing is measured. That is, the weight of the laundry in a dry state is measured as the first weight.

In step S320, the laundry is washed, and may include a rinsing step of rinsing the laundry, and may include a plurality of rinsing steps.

After performing the step (S300), a dehydration operation (S400) is performed. The detailed process of step S400 will be described in detail below with reference to FIGS. 5 to 13 .

Hereinafter, a three-stage dewatering process according to the embodiment will be described with reference to FIG. 5 .

5 is a block diagram of a dewatering process (S400) according to the embodiment.

Referring to FIG. 5 , in the dehydration cycle S400 , the laundry weight sensing section S410 , the first dehydration section S430 , the second dehydration section S450 , and the third dehydration section S470 may be sequentially performed.

First, step S410 may include a draining section and a detection section. In the draining section, the drum 130 may operate for a predetermined time at a drain RPM set in advance from 0 RPM, and then repeat the process of operating at 0 RPM. In the water draining section, the washing water existing inside the drum 130 is discharged.

In the sensing section, the drum 130 becomes the laundry weight sensing RPM at 0 RPM, and the process of operating at 0 RPM again is repeatedly performed, and the laundry weight is sensed. After detecting the amount of laundry in the sensing section, the first stopping section ( S420 ) may be performed.

Step S420 may be disposed between step S410 and the first dehydration section S430. In step S420, the drum 130 is stopped. That is, 0 RPM is maintained for a certain period of time. The reason for stopping the drum will be described in detail with reference to FIG. 7 to be described later. After step S420, step S430 may be performed.

In step S430, an operation for detecting the eccentricity of the laundry is performed. In step S430, the drum 130 is set from 0 RPM to a preset first RPM. In step S430, when the drum 130 reaches the preset reference RPM, the drum 130 operates at the reference RPM for a predetermined time and then becomes the first RPM again. In this case, the reference RPM may be set to a plurality of RPM. However, when the reference RPM is reached in step S430 , the RPM of the drum 130 may be decreased to another reference RMP. The first spin-drying section performs an operation for detecting the spin-drying of the laundry and the eccentricity of the laundry. After the step (S430), the second stop section (S440) may be performed.

Step S440 may be disposed between step S430 and the second dehydration section S450. In step S440, the drum 130 is stopped. That is, from the first RPM to 0 RPM. In addition, 0 RPM is maintained for a certain period of time. After step S440, step S450 may be performed.

In step S450, the drum 130 is set from 0 RPM to a preset second RPM. In step S450, when the drum 130 reaches the preset reference RPM, the drum 130 operates at the reference RPM for a predetermined time and then becomes the second RPM again. After the step S450, the third stopping section S460 may be performed.

Step S460 may be disposed between step S450 and the third dehydration section S470. In step S460, the drum 130 is stopped. That is, from the second RPM to 0 RPM. In addition, 0 RPM is maintained for a certain period of time. After step S460, step S470 may be performed.

In step S470, the drum 130 is set from 0 RPM to a preset third RPM. In step S470, when the drum 130 reaches the preset reference RPM, the drum 130 operates at the reference RPM for a predetermined time and then becomes the third RPM again. In addition, if the RPM exceeds 1000RPM, it is possible to reduce the RPM rise speed. After performing step S470, the dewatering process S400 is terminated.

Hereinafter, RPM for each section of the three-stage dewatering stroke according to the embodiment will be described with reference to FIG. 6 .

6 is an RPM graph for each section of a three-stage dewatering stroke according to an embodiment.

Referring to FIG. 6 , the x-axis represents a dehydration section. The y-axis represents the RPM of the drum 130 .

The laundry weight detection section P410, the first dehydration section P430, the second dehydration section P450, and the third dehydration section P470 may be sequentially performed. In addition, a first stop section P420 may be disposed between the weight detection section P410 and the first dehydration section P430, and a second stop section P420 may be disposed between the first dehydration section P430 and the second dehydration section P450. A stop section P440 may be disposed, and a third stop section P460 may be disposed between the second dehydration section P450 and the third dehydration section P470.

The laundry weight detection section (P410) includes a water draining section (P411) and a detection section (P412). In the water draining section (P411), it can operate at drained RPM, and in the detecting section (P412), it can operate as laundry weight detection RPM. can Drainage RPM and laundry weight detection RPM can be set to 46RMP.

After the laundry amount detection section P410 is performed, the first stopping section P420 may be performed. In the first stop section (P420), the RPM of the drum 130 is reduced to 0 RPM. In addition, 0 RPM can be maintained for a certain period of time. After the laundry amount detection section P420, the first dehydration section P430 is performed.

In the first dehydration section P430, it may operate from 0 RPM to 1 RPM. However, the eccentricity of laundry can be detected by maintaining the reference RPM that has reached the reference RPM during the first dehydration section P430 for a predetermined time and then increasing or decreasing the RPM. The first RPM may be set to 350RPM, and the reference RPM may be set to 65RPM, 108RPM, 170RPM, and 350RPM.

The first dehydration section P430 may include a first eccentricity detection section P431 , a second eccentricity detection section P432 , and a third eccentricity detection section P433 . First, in the first eccentricity detection section (P431), when 65RPM and 108RPM are reached, the RPM is maintained for a predetermined time and then the RPM is increased. On the other hand, when 170RPM is reached, the RPM may be decreased. When 170 RPM is reached, it can be reduced to 108 RPM.

In the second eccentricity detection section (P432), the RPM may be increased from 108 RPM to 350 RPM, and when 350 RPM is reached, 350 RPM may be maintained for a predetermined time and then the RPM may be reduced to 108 RPM. In the third eccentricity detection section (P433), the RPM is increased from 108RPM to 350RPM, and then 350RPM is maintained for a predetermined time.

After the first dehydration section P430, the second stopping section P440 may be performed. In the second stop section (S440), the RPM of the drum 130 is reduced from the first RPM of 350RPM to 0RPM. In addition, 0 RPM can be maintained for a certain period of time. After the second stopping section ( S440 ), the second dehydration section ( P450 ) is performed.

In the second dehydration section P450, it may operate from 0 RPM to the second RPM. The second RPM may be set to 750 RPM. In addition, when the reference RPM is reached, the RPM may be maintained for a predetermined time. After maintaining the reference RPM for a predetermined time, the RPM is increased to the second RPM. In this case, the reference RPM may be set to 65RPM, 108RPM, or 350RPM. When the second RPM is reached, the third stop section P460 may be performed after maintaining the second RPM for a predetermined time.

In the third stop section (P460), the RPM of the drum 130 decreases from 750RPM, which is the second RPM, to 0RPM. In addition, 0 RPM can be maintained for a certain period of time. After the third stop section (P460), the third dehydration section (P470) is performed.

In the third dehydration section (P470), it may operate from 0 RPM to the third RPM. The third RPM may be set to 1100 RPM. In addition, when the reference RPM is reached, the RPM may be maintained for a predetermined time. After maintaining the reference RPM for a predetermined time, the RPM is increased to the second RPM. In this case, the reference RPM may be set to 65RPM, 108RPM, or 350RPM.

When the RPM reaches 1000 RPM in the third dehydration section P470, the RPM may be increased by decreasing the RPM rising speed. When the 3rd RPM is reached, the dehydration process is terminated after operating at the 3rd RPM for a predetermined time.

The values of the first RPM, the second RPM, the third RPM, and the reference RPM described in the description of FIG. 6 are values described as examples, and the embodiment is not limited thereto.

Hereinafter, the reason for stopping the drum 130 in the stopping section according to the embodiment will be described with reference to FIG. 7 .

7 is a schematic diagram showing the pressure for each position of the laundry during the spin-drying cycle according to the embodiment.

Referring to FIG. 7 , D1 denotes a direction close to the surface of the drum 130 , and D2 denotes a direction close to the center of the drum 130 .

The drum 130 rotates and performs washing, rinsing, and dehydration processes. Centrifugal force and centripetal force act on the laundry inside the drum 130 to apply pressure. The pressure applied to the laundry varies depending on the location of the laundry in the drum 130 . The pressure applied to the laundry increases in the direction of D1, and the pressure applied to the laundry decreases in the direction of D2.

The laundry positioned close to the surface of the drum 130 receives a force toward the surface of the drum 130 due to centrifugal force. Accordingly, the laundry located near the surface of the drum 130 is directed in the direction of D1. On the other hand, laundry located close to the center of the drum 130 receives a force in the center direction of the drum 130 by centripetal force and centrifugal force. Therefore, the laundry located in the vicinity of the drum 130 faces the direction of D2.

Accordingly, when the drum 130 continues to rotate without stopping, the positions of the laundry located near the surface of the drum 130 and the laundry located near the center of the drum 130 do not change. Therefore, the laundry located on the surface of the drum 130 continues to receive high pressure, and the laundry located at the center of the drum 130 continues to receive low pressure. For this reason, there is a problem that the pressure does not work evenly on the laundry.

Therefore, by stopping the rotation of the drum 130 in the stop section, the laundry located on the surface of the drum 130 and the laundry located at the center of the drum 130 are mixed to receive the pressure equally.

Hereinafter, the dehydration process of the first cloth according to the embodiment will be described with reference to FIG. 8 .

8 is a block diagram of a dewatering process of the first cloth according to the embodiment.

Referring to FIG. 8 , the dehydration cycle of the first cloth includes a laundry weight and cloth detection section ( S480 ), a first dehydration section ( S430 ), and a second dehydration section ( S450 ). Also, step S480 includes a draining section and a second sensing section.

The water draining section performs the same operation as the water draining section P411 described above. In the water draining section, the drum 130 becomes a preset drain RPM from 0 RPM, operates again at 0 RPM, and the process of operating at the drain RPM for a predetermined time may be repeated. In the water draining section, the washing water existing inside the drum 130 is discharged.

In the second sensing section, the drum 130 becomes the sensing RPM from 0 RPM, and the process of operating at 0 RPM again is repeatedly performed, and the laundry amount of the laundry is sensed. In addition, the weight of the laundry is measured after rotating at the sensing RPM. That is, the weight of the laundry after dehydrating the laundry with the sensed RPM is measured as the second weight.

In the second sensing section, the cloth sensor 220 measures the dehydration degree of laundry by using the first weight and the second weight and Equation (1). Compare the preset standard dehydration and the measured dehydration. If the measured dehydration degree is lower than the reference dehydration degree, the first cloth is classified as the second cloth, and if it is higher than the standard dehydration level, it is classified into the third cloth, and the dehydration process is performed.

When it is determined that the cloth is the first cloth, the first dehydration section ( S430 ) and the second dehydration section ( S450 ) are performed during the three-stage dehydration cycle. However, unlike the dehydration process described above, after the first dehydration section is performed, the second stop section ( S440 ) is not performed. In addition, only a part of step S450 is performed. That is, after performing step S430, the first RPM may be changed to the second RPM. When the second RPM is reached, it operates at the second RPM for a predetermined time and then stops.

Hereinafter, RPM for each section during the dehydration stroke of the first cloth according to the embodiment will be described with reference to FIG. 9 .

9 is a graph showing the RPM for each section during the dehydration stroke of the first cloth according to the embodiment.

Referring to FIG. 9 , in the draining section P411 , the drum 130 becomes a preset drain RPM from 0 RPM, operates again at 0 RPM, and repeats the process of operating at the drain RPM for a certain period of time. have. In the water draining section (P411), the washing water existing in the drum 130 is discharged. In this case, the drain RPM may be set to 46 RPM.

In the second sensing section P482, the drum 130 becomes the sensing RPM from 0 RPM, and the process of operating at 0 RPM again is repeatedly performed, and the laundry amount of the laundry is sensed. In addition, the weight of the laundry is measured after dehydrating the laundry with the detected RPM. That is, the weight of the laundry after dehydrating the laundry with the sensed RPM is measured as the second weight. In this case, the detection RPM may be set to 46 RPM.

In the second sensing section (P482), the cloth sensor 220 measures the dehydration degree of laundry using the first and second weights and Equation (1). Compare the preset standard dehydration and the measured dehydration. If the measured dehydration degree is lower than the reference dehydration degree, the first cloth is classified as the second cloth, and if it is higher than the standard dehydration level, it is classified into the third cloth, and the dehydration process is performed.

When it is determined that the cloth is the first cloth, the first dehydration section P430 and the second dehydration section P450 are performed during the three-stage dehydration cycle. However, unlike the three-stage dehydration process described above, the second dehydration section (P450) is performed by changing the speed from the first RPM to the second RPM without proceeding with the second stop section (P440) after the first dehydration section (P430). can proceed. When the second RPM is reached, it operates at the second RPM for a predetermined time and then stops. In this case, the first RPM may be set to 350 RPM, and the second RPM may be set to 750 RPM.

Here, the numerical values of the multiple RPM, the sensed RPM, the first RPM, and the second RPM are merely exemplary values, and the embodiment is not limited thereto. In addition, the reference RPM may be set to 65RPM, 108RPM, 170RPM, or 350RPM, but the embodiment is not limited thereto.

Hereinafter, the dehydration process of the second cloth according to the embodiment will be described with reference to FIG. 10 .

10 is a block diagram of a dehydration process of the second cloth according to the embodiment.

Referring to FIG. 10 , the dehydration process of the second cloth proceeds to step S480, and when the cloth of the laundry is measured as the second cloth in step S480, step S420, step S430, step ( S440), steps S450, and S460 may be performed, and then a stopping step S490 may be performed during the third dehydration section S470.

In step S490, after performing some sections of step S470, the operation is stopped. That is, it operates for the second time preset at the third RPM in step S470 and then stops. The second time is shorter than the time for maintaining the third RPM in step S470 and operating.

Hereinafter, RPM for each section during the dehydration stroke of the second cloth according to the embodiment will be described with reference to FIG. 11 .

11 is a graph showing the RPM for each section during the dehydration stroke of the second cloth according to the embodiment.

Referring to FIG. 11 , when the dehydration cycle of the second cloth is performed, the drainage RPM and the detection RPM may be set to 46 RPM in the laundry weight and cloth detection section P480. In addition, the first RPM in the first dehydration section P430 may be set to 350 RPM, the second RPM to be set to 750 RPM in the second dehydration section P450, and the third RPM may be set to 1100 RPM in the third dehydration section P490. In addition, the reference RPM can be set to 45 RPM, 108 RPM, 170 RPM, 350 RPM. However, the embodiment is not limited thereto.

Hereinafter, the dehydration process of the third cloth according to the embodiment will be described with reference to FIG. 12 .

12 is a block diagram of a dehydration process of the third cloth according to the embodiment.

Referring to FIG. 12 , the dehydration process of the third cloth proceeds to step S480, and when the cloth of the laundry is measured as the third cloth in step S480, steps S420, S430, and S440 ), step S450, step S460, and step S470, and then ends.

Hereinafter, the dehydration process of the third cloth according to the embodiment will be described with reference to FIG. 13 .

13 is a graph showing the RPM of the dehydration stroke of the third cloth according to the embodiment.

Referring to FIG. 13 , in the case of the dehydration cycle of the third cloth, the drainage RPM and the detection RPM may be set to 46 RPM in the laundry weight and cloth detection section P480. Also, the first RPM in the first dehydration section P430 may be set to 350 RPM, the second RPM to be set to 750 RPM in the second dehydration section P450, and the third RPM may be set to 1100 RPM in the third dehydration section P490. In addition, the reference RPM can be set to 45 RPM, 108 RPM, 170 RPM, 350 RPM. However, the embodiment is not limited thereto.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improved forms of the present invention are also provided by those skilled in the art using the basic concept of the present invention as defined in the following claims. is within the scope of the right. Accordingly, the foregoing detailed description should not be construed as restrictive in all respects but as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

110: cabinet 111: body
112: front plate 112a: inlet
113: top plate 120: tub
120a: tub inlet 121: hanging spring
122: friction damper 123: heater
124: electrode sensor 130: drum
130a: drum inlet 131: lifter
132: through hole 140: water supply
141: water supply hose 142: water supply valve
143: detergent supply device 150: drain unit
151: drain hose 152: drain pump
153: bellows hose 154: tube for pressure transmission
155: water level sensor 160: driving unit
161: motor 162: rotation shaft
170: foreskin detection unit 190: electrode sensor
200: control unit 1: drum washing machine

Claims (18)

A drum washing machine that performs a washing cycle and a spin-drying cycle, the washing machine comprising:
The washing cycle includes a first sensing section for measuring a first weight of the laundry, and the dehydration cycle includes a second sensing section for measuring a second weight of the laundry,
The drum washing machine,
A drum in which the laundry is stored and rotated;
a driving unit that rotates the drum;
A cloth sensor for measuring the dehydration degree of the laundry using the first weight and the second weight, and distinguishing the cloth quality of the laundry using the measured dehydration degree; and
a control unit for controlling the driving unit to perform the washing and dewatering operations, and for changing the RPM and operating time of the drum according to the differentiated fabric in the dewatering operation,
The first weight is the weight measured before washing the laundry, and the second weight is the weight of the laundry measured after rotating the drum according to the sensed RPM,
The operating time is a time during which the spin-drying process is performed. According to claim 1,
The foreskin detection unit,
When the dehydration degree is less than the preset reference dehydration degree, the cloth of the laundry is determined as the first cloth, and when the dehydration degree is the same as the reference dehydration degree, the cloth of the laundry is determined as the second cloth, and the dehydration degree is the If the standard dehydration degree is exceeded, it is determined that the fabric of the laundry is a third fabric,
The control unit is
and controlling the driving unit to increase the RPM and increase the operating time according to the order of the first cloth, the second cloth, and the third cloth in the dehydration cycle. 3. The method of claim 2,
The dehydration cycle includes a first dehydration section, a second dewatering section, and a third dehydration section,
The control unit is
to rotate the drum according to a first RPM in the first spin-drying section, rotate the drum according to a second RPM in the second spin-dry section, and rotate the drum according to a third RPM in the third spin-dry section A drum washing machine that controls the driving unit. 4. The method of claim 3,
The sensed RPM is lower than the first RPM, the first RPM is lower than the second RPM, and the second RPM is lower than the third RPM. 5. The method of claim 4,
The dewatering process sequentially includes a first dehydration section, a second dehydration section, and a third dehydration section,
The control unit is
When it is determined that the first cloth is formed, the drum washing machine ends the spin-drying cycle after the second spin-drying section. 6. The method of claim 5,
The control unit is
When it is determined that the second cloth is used, the drum washing machine ends the spin-drying cycle after performing some sections of the third spin-drying section. 7. The method of claim 6,
The control unit is
If it is determined that the third cloth, the drum washing machine ends the spin-drying cycle after the third spin-drying section. 8. The method of claim 7,
The dewatering stroke further includes a first stop section, a second stop section, and a third stop section,
The first stop section is disposed between the second sensing section and the first dehydration section, the second stop section is disposed between the first dehydration section and the second dehydration section, and the third stop section includes: It is disposed between the second dehydration section and the third dehydration section,
The control unit is
and controlling the driving unit so that the RPM becomes 0 in the first stop section, the second stop section, and the third stop section. 9. The method of claim 8,
The control unit is
In the first dehydration section, rotating the drum from 0 RPM to the first RPM,
In the second dehydration section, rotating the drum from 0 RPM to the second RPM,
In the third dehydration section, rotating the drum from 0 RPM to the third RPM,
When the RPM reaches a preset reference RPM in each of the first spin-drying section, the second spin-drying section, and the third spin-drying section, the driving unit maintains the RPM as the reference RPM for a second preset time. to control,
The second time is changed according to the set RPM value, the drum washing machine. In the control method of a drum washing machine performing a washing cycle and a spin-drying cycle,
In the first detection section, measuring a first weight of the laundry;
measuring a second weight of the laundry in the second sensing section;
measuring the dehydration degree of the laundry using the measured first weight and the measured second weight;
distinguishing the fabric of the laundry using the measured dehydration degree; and
changing the RPM and operating time of the drum according to the differentiated cloth in the dewatering stroke,
The first detection section is included in the washing cycle, the second detection section is included in the dehydration cycle,
The first weight is the weight of the laundry before washing, and the second weight is the weight of the laundry measured after rotating the drum according to the sensed RPM,
The operating time is a time during which the spin-drying process is performed. 11. The method of claim 10,
The step of distinguishing the fabric of the laundry by using the dehydration is,
determining that the fabric of the laundry is a first fabric when the dehydration degree is less than a preset reference degree of dehydration;
determining that the fabric of the laundry is a second fabric when the dehydration degree is the same as the reference dehydration degree; and
Determining the fabric of the laundry as a third fabric when the dehydration degree exceeds the reference degree of dehydration
including,
Changing the RPM and operating time of the drum according to the forge is,
controlling the RPM to increase and the operation time to increase according to the order of the first, second, and third cloths in the dehydration stroke
Including, a control method of a drum washing machine. 12. The method of claim 11,
The dehydration cycle includes a first dehydration section, a second dewatering section, and a third dehydration section,
Changing the RPM and operating time of the drum according to the forge is,
to rotate the drum according to a first RPM in the first spin-drying section, rotate the drum according to a second RPM in the second spin-dry section, and rotate the drum according to a third RPM in the third spin-dry section step to control
Further comprising, the control method of the drum washing machine. 13. The method of claim 12,
The sensed RPM is lower than the first RPM, the first RPM is lower than the second RPM, and the second RPM is lower than the third RPM. 14. The method of claim 13,
The dewatering process sequentially includes a first dehydration section, a second dehydration section, and a third dehydration section,
Changing the RPM and operating time of the drum according to the forge is,
terminating the dehydration cycle after the second dehydration section when it is determined that the first follicle is
Further comprising, the control method of the drum washing machine. 15. The method of claim 14,
Changing the RPM and operating time of the drum according to the forge is,
terminating the dehydration cycle after performing some sections of the third dehydration section when it is determined as the second follicle
Further comprising, the control method of the drum washing machine. 16. The method of claim 15,
Changing the RPM and operating time of the drum according to the forge is,
terminating the dehydration cycle after the third dehydration section when it is determined that the third follicle is
Further comprising, the control method of the drum washing machine. 17. The method of claim 16,
The dewatering stroke further includes a first stop section, a second stop section, and a third stop section,
The first stop section is disposed between the second sensing section and the first dehydration section, the second stop section is disposed between the first dehydration section and the second dehydration section, and the third stop section includes: It is disposed between the second dehydration section and the third dehydration section,
Changing the RPM and operating time of the drum according to the forge is,
making the RPM become 0 in the first stop section, the second stop section, and the third stop section
Further comprising, the control method of the drum washing machine. 18. The method of claim 17,
Changing the RPM and operating time of the drum according to the forge is,
rotating the drum from the 0 RPM to the first RPM in the first dehydration section;
rotating the drum from 0 RPM to the second RPM in the second dehydration section;
rotating the drum from 0 RPM to the third RPM in the third dehydration section, and
When the RPM reaches a preset reference RPM in each of the first dehydration section, the second dehydration section, and the third dehydration section, the RPM is maintained at the reference RPM for a second preset time, and then the RPM is restarted. controlling the driving unit so that it rises
further comprising,
The second time is changed according to the set RPM value, the control method of the drum washing machine.

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