KR20210044496A - Method for controlling washing machine - Google Patents

Abstract

Disclosed is a method for controlling a washing machine. According to the present invention, a weight sensor for detecting the weight of laundry is installed on a suspension bar that suspends an outer tub of the washing machine. The method for controlling the washing machine, while a driving unit rotates a washing tub to spin the laundry, the weight sensor measures the weight of the laundry and ends the spin-drying of the laundry based on a weight measurement value.

Description

Control method of washing machine {METHOD FOR CONTROLLING WASHING MACHINE}

The present invention relates to a control method of a washing machine, and more particularly, to a control method of a washing machine that spins laundry after washing has been completed.

If there is a lot of laundry compared to its capacity, the laundry may not be dehydrated properly. In addition, if the laundry is skewed to one side in the washing tank, normal dehydration may not be achieved. Recently, the rotational power of the washing tub is lowered within a certain range for cloth protection and optimum dehydration. However, although it is said to be for fabric protection, if a large amount of water remains in the laundry, the drying time increases and water droplets may fall from the laundry during drying, which may increase user dissatisfaction.

In this regard, Korean Laid-Open Patent Publication No. 2000-0025011 (hereinafter referred to as'Prior Document 1') discloses a method for controlling the spin-drying time of a washing machine. In the method of controlling the spin-drying time of the washing machine of Prior Document 1, the first load sensing is performed in a dry cloth state at the beginning of washing to obtain the amount of laundry (W1). Then, perform washing and rinsing. Then, before spinning, a second load sensing is performed to determine the amount of laundry (W2).

The method of controlling the spin-drying time of a washing machine in Prior Document 1 recognizes the type of laundry by obtaining W2/W1. If it is determined that W2/W1 is smaller than K1, it is recognized as chemical fiber-based laundry and the spin-drying time is set to 5 minutes or less. If it is determined that W2/W1 is a value greater than or equal to K1 and less than or equal to K2, it is recognized that chemical fiber laundry and natural fiber laundry are mixed, and the spin-drying time is set between 5 and 9 minutes. If it is determined that W2/W1 is greater than K2, it is recognized as natural fiber-based laundry and the spin-drying time is set to 9 minutes or more.

The method of controlling the dehydration time of a washing machine of Prior Document 1 can calculate an appropriate dehydration time according to the type of laundry such as chemical fibers, natural fibers, and blended products. Accordingly, it is possible to solve the problem that the laundry is damaged or the degree of dehydration of the laundry is lowered.

However, the method of controlling the spin-drying time of a washing machine of Prior Document 1 has a problem in that it cannot be detected when a part of laundry is removed or added before spin-drying starts. If part of the laundry is taken out before the spin-drying starts, proper spin-drying can be performed only when the spin-drying time is shortened. In addition, if laundry of a different type is added before the spin-drying starts, proper spin-drying can be performed only when the spin-drying time is increased. In particular, when a large amount of laundry that requires a relatively long period of dehydration, such as jeans or towels, is added, proper dehydration is difficult.

The method of controlling the spin-drying time of a washing machine in Prior Document 1 recognizes the type of laundry by obtaining W2/W1. However, it is difficult to accurately recognize the type of laundry with only W2/W1. There is a need for a method that can improve the accuracy of laundry recognition as much as possible within a range in which no additional device is installed.

The method of controlling the spin-drying time of a washing machine in Prior Document 1 recognizes the type of laundry by obtaining W2/W1. However, even if the type of laundry is recognized relatively accurately, the degree of dehydration of the laundry differs depending on the shape of the laundry tangled and the degree of bias of the laundry.

In recent years, electric dryers are becoming popular. Electric dryers have a long drying time. In particular, when the temperature is low, the drying time is longer. To shorten the drying time, as much moisture as possible should be removed before putting the laundry in the electric dryer.

On the other hand, in strong sunlight or dry weather, even if the dehydration of the laundry is low, the laundry taken out of the washing machine is dried quickly and naturally. However, in cloudy or humid weather, there is an inconvenience that the natural drying time is delayed even if the dehydration of the laundry is high.

Republic of Korea Patent Publication No. 2000-0025011 (Registration date: 2000.05.06)

One problem to be solved by the present invention is to provide a control method of a washing machine in which the accuracy of laundry recognition is improved.

One problem to be solved by the present invention is to provide a control method of a washing machine in which laundry is dehydrated with a constant spin-drying degree.

One problem to be solved by the present invention is to provide a control method of a washing machine, which is made convenient to use a dryer after dehydration is completed.

One problem to be solved by the present invention is to provide a control method of a washing machine that enables a user to predict the natural drying time of laundry that has been dehydrated.

In the control method of a washing machine according to an embodiment of the present invention, while the driving unit rotates the washing tub to spin the laundry, a weight sensor may measure the weight of the laundry and terminate the spinning of the laundry based on the weight measurement value.

The washing machine may include the washing tub, the outer tub, the driving unit, the suspension bar, and the weight sensor.

The outer tub may accommodate the washing tub. The laundry may be put into the washing tub.

The driving unit may rotate the washing tub.

The suspension bar may be a device for suspending the outer tub.

The weight sensor may detect the weight of the laundry. The weight sensor may be installed on the suspension bar.

The weight sensor may measure the weight of the laundry while the drive unit rotates the washing tub at a constant speed to dehydrate the laundry.

The weight sensor may measure the weight of the laundry multiple times. When the reduction rate of the weight measurement value is less than the first reference value, dehydration of the laundry may be terminated based on this.

Therefore, accuracy of laundry recognition can be improved even if an additional device necessary for laundry recognition is not installed.

Before the laundry is dehydrated, the amount of dry cloth in the laundry may be measured.

When the reduction rate of the weight measurement value is less than the first reference value, and the ratio of the weight measurement value to the dry cloth amount is less than or equal to the second reference value, dehydration of the laundry may be terminated.

The first speed may be set in inverse proportion to the weight of the laundry.

When the ratio of the weight measurement value to the dry cloth amount exceeds the second reference value, the first speed may be changed in response to the weight measurement value.

Therefore, even if laundry is added or partially removed immediately before the start of spin-drying, the laundry may be dehydrated with a constant spin-drying degree. In addition, laundry can be dehydrated with a certain degree of dehydration regardless of the degree of tangling or skewed laundry.

Before the laundry is dehydrated, the amount of wetness of the laundry may be measured.

When the reduction rate of the weight measurement value is less than the first reference value, and the reduction amount of the weight measurement value relative to the amount of the wet cloth is less than the third reference value, dehydration of the laundry may be terminated.

The first speed may be set in inverse proportion to the weight of the laundry.

When the amount of reduction of the weight measurement value relative to the amount of the compress exceeds a third reference value, the first speed may be changed in response to the weight measurement value.

Therefore, even if laundry is added or partially removed immediately before the start of spin-drying, the laundry may be dehydrated with a constant spin-drying degree. In addition, laundry can be dehydrated with a certain degree of dehydration regardless of the degree of tangling or skewed laundry.

Before the laundry is dehydrated, the amount of dry cloth in the laundry may be measured.

When the ratio of the weight measurement value to the amount of dry cloth is less than or equal to the second reference value, dehydration of the laundry may be terminated.

Before the laundry is dehydrated, the amount of wetness of the laundry may be measured.

Dehydration of the laundry may be terminated when the amount of reduction of the weight measurement value relative to the amount of the compress is less than the third reference value.

Before the laundry is dehydrated, the amount of dry cloth in the laundry may be measured.

When the dehydration of the laundry is finished, the first information may be transmitted to the user's terminal or dryer after measuring the finished cloth amount of the laundry.

Accordingly, the user can predict the natural drying time of the laundry that has been dehydrated. In addition, after the dehydration is completed, the dryer is more convenient to use, and the dryer time can be shortened.

The first information may include a ratio of the amount of the finished cloth to the amount of the dried cloth.

Before the laundry is dehydrated, the amount of wetness of the laundry may be measured.

When the dehydration of the laundry is finished, the second information may be transmitted to the user's terminal or dryer after measuring the finished cloth amount of the laundry.

Accordingly, the user can predict the natural drying time of the laundry that has been dehydrated. In addition, after the dehydration is completed, the dryer is more convenient to use, and the time for using the dryer can be shortened.

The second information may include a ratio of the amount of the finished cloth to the amount of the compress.

The weight sensor may measure the weight of the laundry multiple times.

Spinning of the laundry may be terminated after the washing tub is rotated at the maximum spinning speed.

The maximum spin rotation speed may be set in inverse proportion to the reduction rate of the weight measurement value.

Therefore, even if laundry is added or partially removed immediately before the start of spin-drying, the laundry may be dehydrated with a constant spin-drying degree. In addition, laundry can be dehydrated with a certain degree of dehydration regardless of the degree of tangling or skewed laundry.

The weight sensor may measure the weight of the laundry multiple times.

The fabric quality of the laundry can be determined by the reduction rate of the weight measurement value.

Therefore, accuracy of laundry recognition can be improved even if an additional device necessary for laundry recognition is not installed.

According to an embodiment of the present invention, the weight sensor measures the weight of the laundry while the drive unit rotates the washing tub to spin the laundry, and terminates the spinning of the laundry based on the weight measurement value, so that an additional device necessary for laundry recognition is not installed. If not, the accuracy of laundry recognition can be improved.

According to an embodiment of the present invention, when the reduction rate of the weight measurement value is less than the first reference value, the dehydration of the laundry is terminated based on this, so that even if laundry is added or partially removed immediately before the start of spinning, the laundry can be dehydrated with a constant spinnerability. In addition, laundry can be dehydrated with a certain degree of dehydration regardless of the degree of tangling or skewed laundry.

According to an embodiment of the present invention, when the dehydration of the laundry is finished, the first or second information is transmitted to the dryer after measuring the finished cloth amount of the laundry, making it convenient to use the dryer and shortening the time of using the dryer. Can be.

According to an embodiment of the present invention, when the spin-drying of the laundry is finished, the first or second information is transmitted to the user's terminal after measuring the finished cloth amount of the laundry, so that the user numerically confirms the spin-drying is completed and the spin-drying is completed. You can predict the natural drying time of laundry.

1 is a cross-sectional view showing a washing machine.
Figure 2 is a flow chart showing a control method of the washing machine according to the first embodiment of the present invention.
3 is a time-rotation speed graph according to the control method of the washing machine of FIG. 2.
4 is a flow chart showing a control method of a washing machine according to a second embodiment of the present invention.
5 is a time-rotation speed graph according to the control method of the washing machine of FIG. 4.
6 is a flow chart showing a control method of a washing machine according to a third embodiment of the present invention.
7 is a time-rotation speed graph according to the control method of the washing machine of FIG. 6.
8 is a flow chart showing a control method of a washing machine according to a fourth embodiment of the present invention.
9 is a diagram showing information transfer between a washing machine, a dryer, and a terminal.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, descriptions of functions or configurations that are already known will be omitted in order to clarify the gist of the present invention.

1 is a cross-sectional view showing a top loader washing machine.

1, the top loader washing machine 10 includes a case 11, an outer tub 12, an inner tub 13, a washing tub, a pulsator 14, a driving unit 15, a suspension bar 16, and It is configured to include a weight sensor (17).

The outer tub 12 accommodates the washing tub 13 into which laundry is put. The drive unit rotates the washing tub 13. The suspension bar 16 is configured to suspend the outer tub 12. A weight sensor 17 for sensing the weight of laundry is installed on the suspension bar 16. The weight sensor 17 is provided as a load cell.

The load cell can be manufactured using a strain gauge. As disclosed in Korean Registered Patent Publication No.1729577, the suspension bar 16 for suspending the outer tub 12, and the weight sensor 17 installed in the suspension bar 16 are known technologies, so a detailed description thereof will be omitted. .

Before dehydration, the water in the outer tank 12 and the inner tank 13 is drained to the outside through the drain passage 18. A drain pump 19 for discharging water to the outside is installed in the drain passage 18. The drain passage 18 is opened and closed by a drain valve 20. The control methods S100, S200, S300, and S400 of the washing machine according to the embodiment of the present invention described below may be set in a control unit (not shown) of the top loader washing machine 10.

Example 1

2 is a flowchart illustrating a method of controlling a washing machine according to an exemplary embodiment of the present invention. 3 is a time-rotation speed graph according to the control method of the washing machine of FIG. 2.

As shown in Figure 2, the control method (S100) of the washing machine according to the first embodiment of the present invention is a step of measuring the amount of dry cloth (S110), washing (S120), measuring the amount of wet cloth (S130) , Rotating at the first speed (VM) (S141), measuring the weight (S143), and determining whether the dehydration is complete (S144).

The step of measuring the amount of dry cloth (S110) is a step of measuring the amount of dry cloth of laundry put into the washing tank 13. The amount of dry cloth means the amount of laundry (washing cloth amount) before water is added to the washing tub 13.

Laundry is made of natural and/or synthetic fibers. As disclosed in Korean Laid-Open Patent Publication No. 2000-0025011 (hereinafter,'Prior Document 1'), fibers have different properties of absorbing water depending on the type. Therefore, the spin speed and spin time must be adjusted depending on the material of the laundry to obtain a uniform spin rate.

The bagging detection method is a method of determining the water level by changing the magnetic flux change that occurs when rotating a gear installed on the motor shaft into a square wave, which is an electrical signal with a Hall sensor, that is, the number of pulses obtained by detecting the current rotational force according to the bagging amount. There is a way to judge.

Alternatively, in the method of detecting the amount of cloth, a square wave is generated when the signal by the back EMF of the motor is higher than a certain voltage, and the number of pulses generated by the current rotational force according to the amount of cloth is determined. Alternatively, a separate weight sensor can be used to detect the amount of fabric. Since the method of detecting the amount of cloth is a well-known technique, a detailed description thereof will be omitted.

As shown in Figure 2, when the step (S110) of measuring the amount of dry fabric is completed, the step of washing (S120) is started. The washing step S120 may be a step of injecting water into the washing tub 13 and washing and rinsing the laundry. Alternatively, the washing step S120 may be a step of injecting water into the washing tub 13 and washing or rinsing the laundry.

When the washing step (S120) is completed, the step (S130) of measuring the amount of poultice is started. The step of measuring the amount of wetness (S130) is a step (S130) of draining the water in the washing tub 13 and measuring the amount of wetness of the laundry. The control unit of the washing machine 10 opens the drain valve 20 and operates the drain pump 19 before measuring the amount of moisture.

The amount of wet cloth refers to the amount of laundry (dewatering amount) measured after draining the water in the washing tub 13. As shown in FIG. 3, the amount of wetness is measured by the above-described method of detecting the amount of cloth while repeatedly accelerating and decelerating the washing tub 13.

When the step of measuring the amount of poultice (S130) is completed, dehydration is started (S140). As shown in FIG. 3, after the spin-drying starts (S140), the washing tub 13 gradually accelerates and rotates at a first speed (VM) (S141).

As shown in FIG. 2, the step of rotating at the first speed VM (S141) is a step of rotating the washing tub 13 at the maximum rotational speed. The maximum rotational speed may mean the maximum rotational speed of the washing tub 13 set as default in a specific laundry course (standard course, wool course, blanket course, etc.). The washing tub 13 rotates at a constant speed for a predetermined time at a first speed VM to dehydrate the laundry (S142).

While the washing tub 13 rotates at a constant speed for a certain period of time at the first speed VM (S142), the water contained in the laundry gradually escapes from the laundry. The step of measuring the weight (S143) is a step in which the weight sensor 17 measures the weight of the laundry at the first speed VM.

The step of determining whether the dehydration is finished (S144) is a step of terminating the dehydration of the laundry based on the weight measurement value.

If the ratio of the weight measurement value to the amount of dry cloth is less than or equal to the second reference value in the step (S144) of determining whether the dehydration is terminated, the dehydration of the laundry may be terminated. If this is expressed as an equation, it is as shown in [Equation 1] below.

[Equation 1]

Here, A: dry cloth amount, C ₀ : weight measurement value, X ₂ : second reference value

The second reference value is as follows.

X ₁ =1.8

That is, when the dry cloth amount is 100% weight, if the weight measurement value is 180% or less, the dehydration of the laundry can be terminated. Assuming that the dry cloth is 100% weight, if the weight measurement value is less than 180%, it is judged that the laundry is sufficiently dehydrated. If this is satisfied, the dehydration of the laundry is terminated.

As shown in FIG. 2, when the ratio of the weight measurement value to the amount of dry cloth exceeds the second reference value in the step of determining whether the dehydration is finished (S144), the washing tub 13 is again operated at the first speed VM for a certain period of time. Rotate (S142). Then, the step of measuring the weight (S143) and the step of determining whether the dehydration is finished (S144) are performed again.

Meanwhile, in the step of determining whether the dehydration is finished (S144), if the amount of reduction of the weight measurement value relative to the amount of wet cloth is less than the third reference value, the dehydration of the laundry may be terminated. If this is expressed as an equation, it is as shown in [Equation 2] below. The weight sensor 17 measures the weight of the laundry multiple times at intervals of time (t).

[Equation 2]

Where, B: packing amount, C _0: weight measurement, C _t: C ₀ after the time (t) has elapsed after the measurement weight measure, X _3: a third reference value,

The third reference value, time (t), is as follows.

X ₃ =0.01

t=1 minute

In other words, it is an equation for determining whether the weight reduction rate of the weight measurement value for 1 minute is less than 1% when the amount of poultice is 100% weight. Assuming that the amount of poultice is 100% weight, if the weight reduction rate of the weight measurement value for 1 minute is less than 1%, it is judged that the laundry is sufficiently dehydrated. If this is satisfied, the dehydration of the laundry is terminated.

As shown in Fig. 2, when the weight reduction rate of the weight measurement value for 1 minute is 1% or more when the amount of pouch is 100% weight, the washing tub 13 is rotated again at a first speed VM for a certain period of time (S142) Let it. Then, the step of measuring the weight (S143) and the step of determining whether the dehydration is finished (S144) are performed again.

Example 2

4 is a flow chart showing a control method of a washing machine according to a second embodiment of the present invention. 5 is a time-rotational speed graph according to the control method of the washing machine of FIG. 4.

As shown in Figure 5, the control method (S200) of the washing machine according to the second embodiment of the present invention is the step of measuring the dry cloth amount (S210), the washing step (S220), the step of measuring the wet cloth amount (S230) , Including the step of rotating at the first speed (VM1) (S241), measuring the weight (S243), determining whether dehydration is terminated (S244), and determining whether the secondary dehydration is terminated (S245). It is composed.

The step of measuring the amount of dry cloth (S210) is a step of measuring the amount of dry cloth of laundry put into the washing tub 13. The amount of dry cloth means the amount of laundry (washing cloth amount) before water is added to the washing tub 13.

As shown in Figure 4, when the step (S210) of measuring the amount of dry cloth is completed, the step of washing (S220) is started. The washing step S220 may be a step of injecting water into the washing tub 13 and washing and rinsing the laundry. Alternatively, the washing step S220 may be a step of injecting water into the washing tub 13 and washing or rinsing the laundry.

When the washing step (S220) is completed, the step (S230) of measuring the amount of poultice is started. The step of measuring the amount of wetness (S230) is a step (S230) of draining the water in the washing tub 13 and measuring the amount of wetness of the laundry. The control unit of the washing machine 10 opens the drain valve 20 and operates the drain pump 19 before measuring the amount of moisture.

The amount of wet cloth refers to the amount of laundry (dewatering amount) measured after draining the water in the washing tub 13. As shown in FIG. 5, the amount of wet cloth is measured by the above-described method of detecting the amount of cloth while repeatedly accelerating and decelerating the washing tub 13.

When the step of measuring the amount of poultice (S230) is completed, dehydration is started (S240). As shown in FIG. 5, after the spin-drying is started (S240), the washing tub 13 is gradually accelerated and rotated at a first speed VM1 (S241).

As shown in FIG. 4, the step of rotating at the first speed VM1 (S241) is a step of rotating the washing tub 13 at the maximum rotational speed. The maximum rotational speed may mean the maximum rotational speed of the washing tub 13 set as default in a specific laundry course (standard course, wool course, blanket course, etc.). The washing tub 13 rotates at a first speed VM1 for a predetermined time to dehydrate the laundry (S242).

While the washing tub 13 rotates at the first speed VM1 for a certain period of time (S242), the water contained in the laundry is gradually discharged from the laundry. The step of measuring the weight (S243) is a step in which the weight sensor 17 measures the weight of the laundry at the first speed VM1. The weight sensor 17 measures the weight of the laundry multiple times at intervals of time (t).

If the reduction rate of the weight measurement value is less than the first reference value in the step (S244) of determining whether the dehydration is terminated, the dehydration of the laundry is terminated based on this. That is, the amount of dry cloth and the amount of wet cloth are not used as variables, and two or more of the weight measurement values are used as variables to determine whether dehydration is complete. If this is expressed as an equation, it is as follows [Equation 3].

[Equation 3]

Here, C ₀ : weight measurement value, C _t : weight measurement value after time (t) elapses after C _{0 measurement, X 1} : first reference value

The first reference value and time (t) are as follows.

X ₃ =0.01

t=1 minute

If the reduction rate of the weight measurement value is greater than or equal to the first reference value in the step S244 of determining whether the dehydration is finished, the washing tub 13 is rotated again at the first speed VM1 for a certain period of time (S242). Then, the step of measuring the weight (S243) and the step of determining whether the dehydration is finished (S244) are performed again.

If the weight reduction rate of the weight measurement value is less than 1% per minute, the step of determining whether the secondary dehydration is terminated (S245) is initiated.

If the ratio of the weight measurement value to the amount of dry cloth is less than or equal to the second reference value in the step of determining whether the secondary dehydration is finished (S245), the dehydration of the laundry may be terminated. If this is expressed as an equation, it is as shown in [Equation 4] below.

[Equation 4]

Here, A: dry cloth amount, C ₀ : weight measurement value, X ₂ : second reference value

The second reference value is as follows.

X ₁ =1.8

That is, when the dry cloth amount is 100% weight, if the weight measurement value is 180% or less, the dehydration of the laundry can be terminated. Assuming that the dry cloth is 100% weight, if the weight measurement value is less than 180%, it is judged that the laundry is sufficiently dehydrated. If this is satisfied, the dehydration of the laundry is terminated.

In addition, in the step of determining whether the secondary dehydration is terminated (S245), if the amount of reduction of the weight measurement value relative to the amount of wet cloth is less than the third reference value, the dehydration of the laundry may be terminated. If this is expressed as an equation, it is as shown in [Equation 5] below. The weight sensor 17 measures the weight of the laundry multiple times at intervals of time (t).

[Equation 5]

Where, B: packing amount, C _0: weight measurement, C _t: C ₀ after the time (t) has elapsed after the measurement weight measure, X _3: a third reference value,

The third reference value, time (t), is as follows.

X ₃ =0.01

t=1 minute

In other words, it is an equation for determining whether the weight reduction rate of the weight measurement value for 1 minute is less than 1% when the amount of poultice is 100% weight. Assuming that the amount of poultice is 100% weight, if the weight reduction rate of the weight measurement value for 1 minute is less than 1%, it is judged that the laundry is sufficiently dehydrated. If this is satisfied, the dehydration of the laundry is terminated.

As shown in FIG. 4, if [Equation 4] or [Equation 5] is not satisfied, the first speed VM1 is changed (S246, S247) in response to the weight measurement value. First, a step (S246) of determining whether the current first speed VM1 is the maximum rotational speed compared to the third cloth is started.

If it is determined that the current first speed VM1 is the maximum rotational speed compared to the weight measurement value, the washing tub 13 is rotated again at the first speed VM1 for a certain period of time (S242). Then, the step of measuring the weight (S243), the step of determining whether the dehydration is terminated (S244), and the step of determining whether the secondary dehydration is terminated (S245) are performed again.

The first speed VM1 may be set in the step S230 of measuring the amount of poultice. That is, the first speed VM1 may be a value corresponding to the amount of compresses. The first speed VM1 is set in the controller of the washing machine 10 as a value that is inversely proportional to the weight of the laundry. In general, the weight measurement value is less than the amount of cloth because it is the amount of cloth measured after the start of dehydration.

If it is determined that the current first speed VM1 is not the maximum rotational speed compared to the weight measurement value, the step of resetting the first speed VM1 (S247) is started. The first speed VM1 increases in response to the weight measurement value.

Thereafter, the washing tub 13 is rotated (S242) for a certain time at the changed first speed VM2. Then, the step of measuring the weight (S243), the step of determining whether the dehydration is terminated (S244), and the step of determining whether the secondary dehydration is terminated (S245) are performed again.

Example 3

6 is a flow chart showing a control method of a washing machine according to a third embodiment of the present invention. 7 is a time-rotation speed graph according to the control method of the washing machine of FIG. 6.

As shown in Figure 6, the control method (S300) of the washing machine according to the third embodiment of the present invention is a step of measuring the amount of dry cloth (S310), washing (S320), measuring the amount of wet cloth (S330) , Rotating at the first speed (VD) (S341), measuring the weight (S342), determining the quality of the laundry (S343), setting the maximum spinning speed (S344), the maximum spinning rotation It is configured to include a step of rotating at a speed (S345).

The step of measuring the amount of dry cloth (S310) is a step of measuring the amount of dry cloth of the laundry put into the washing tank 13. The amount of dry cloth means the amount of laundry (washing cloth amount) before water is added to the washing tub 13.

As shown in FIG. 6, when the step of measuring the amount of dry fabric (S310) is completed, the step of washing (S320) is started. The washing step S320 may be a step of injecting water into the washing tub 13 and washing and rinsing the laundry. Alternatively, the washing step S320 may be a step of injecting water into the washing tub 13 and washing or rinsing the laundry.

When the washing step (S320) is completed, the step (S330) of measuring the amount of moisture is started. The step of measuring the amount of wetness (S330) is a step (S330) of draining the water in the washing tub 13 and measuring the amount of wetness of the laundry. The control unit of the washing machine 10 opens the drain valve 20 and operates the drain pump 19 before measuring the amount of moisture.

The amount of wet cloth refers to the amount of laundry (dewatering amount) measured after draining the water in the washing tub 13. As shown in FIG. 7, the amount of wetness is measured by the above-described method of detecting the amount of cloth while repeatedly accelerating and decelerating the washing tub 13.

When the step of measuring the amount of poultice (S330) is completed, dehydration is started (S340). As shown in FIG. 7, after the spin-drying is started (S340), the washing tub 13 gradually accelerates and rotates at a first speed VD (S341).

As shown in FIG. 6, the step of rotating at the first speed VD (S341) is a step of rotating the washing tub 13 at a sensing rotation speed slower than the resonance generation speed. The sensing rotation speed may be around 400RPM. Alternatively, the sensing rotation speed may be in several sections, such as 120RPM, 250RPM, and 400RPM.

When the step of rotating at the first speed VD (S341) is completed, the weight sensor 17 measures the weight of the laundry (S342), and then determines the fabric quality of the laundry (S343).

In the step of determining the fabric quality of the laundry (S343), the fabric quality of the laundry may be determined by a reduction rate of the weight measurement value. The weight sensor 17 measures the weight of the laundry multiple times at intervals of time (t).

The fabric quality of laundry can be judged by the result of [Calculation 1] below.

[Calculation 1]

Here, C ₀ : weight measurement value, C _t : measurement value of the third cloth after time (t) elapses after measurement of _{C 0}

That is, the fabric quality of the laundry can be determined as a reduction rate of the weight measurement value. When a centrifugal force acts on the laundry, the speed of water escaping from the laundry differs depending on the material of the laundry. The control unit stores data on the spinning speed for each material of laundry according to the rotational speed of the washing tub 13 in advance.

The control unit of the washing machine 10 stores the time elapsed from the start of spinning (S340) to the step (S343) of determining the fabric quality, and the rotational speed of the washing tub (13). Therefore, the control unit can determine the fabric quality of the laundry as a reduction rate of the weight measurement value.

When the fabric quality of the laundry is determined (S343), the maximum spin rotation speed VM1 is reset (S344) according to the determined fabric quality. The washing tub is rotated (S345) at the reset maximum spin rotation speed (VM2). As shown in FIG. 7, when a predetermined period of time elapses (S346) after the washing tub 13 is rotated at the maximum spin-drying rotation speed VM2 (S345), the spin-drying of the laundry is terminated.

Example 4

8 is a flow chart showing a control method of a washing machine according to a fourth embodiment of the present invention. 9 is a diagram showing information transfer between a washing machine, a dryer, and a terminal.

As shown in Figure 8, the control method (S400) of the washing machine according to the fourth embodiment of the present invention is the step of measuring the amount of dry cloth (S410), the step of washing (S420), the step of measuring the amount of wet cloth (S430). , Dehydration proceeding (S440), ending dehydration (S441), measuring the finished cloth (S442), transmitting the first information to the terminal (S443), transmitting the second information to the dryer It comprises a step (S444).

The step of measuring the amount of dry cloth (S410) is a step of measuring the amount of dry cloth put into the washing tub 13. The amount of dry cloth means the amount of laundry (washing cloth amount) before water is added to the washing tub 13.

As shown in FIG. 8, when the step of measuring the amount of dry fabric (S410) is completed, the step of washing (S420) is started. The washing step S420 may be a step of injecting water into the washing tub 13 and washing and rinsing the laundry. Alternatively, the washing step S420 may be a step of injecting water into the washing tub 13 and washing or rinsing the laundry.

When the washing step (S420) is completed, the step (S430) of measuring the amount of moisture is started. The step of measuring the amount of wetness (S430) is a step (S430) of draining the water in the washing tub 13 and measuring the amount of wetness of the laundry. The control unit of the washing machine 10 opens the drain valve 20 and operates the drain pump 19 before measuring the amount of moisture.

The amount of wet cloth refers to the amount of laundry (dewatering amount) measured after draining the water in the washing tub 13. The amount of wetness is measured by the above-described method of detecting the amount of cloth while repeatedly accelerating and decelerating the washing tub 13.

When the step of measuring the amount of poultice (S430) is completed, dehydration proceeds (S440). When the dehydration proceeds (S440), the washing tub 13 gradually accelerates to the maximum rotational speed to dehydrate the laundry. From the dehydration process (S440) to the dehydration end (S441), the dehydration process in any one of the first to third embodiments (S140, S240, and S340) may be performed in the order of termination.

When the laundry is dewatered (S441), the step of measuring the amount of finished laundry (S442) is started. The finished cloth volume means the amount of laundry measured after dehydration is completed. The finished cloth amount is measured by the above-described method of detecting the amount of cloth while repeatedly accelerating and decelerating the washing tub 13.

When the step of measuring the finished cloth amount (S442) is completed, the step of transmitting the first information to the user's terminal 30 (S443) and the step of transmitting the second information to the dryer 20 (S444) are started. The first information may be transmitted to the dryer 20. The second information may be transmitted to the user's terminal 30.

The first information may include a ratio of the amount of finished cloth to the amount of dried cloth. The second information may include a ratio of the amount of finished cloth to the amount of dried cloth.

As shown in FIG. 9, a dedicated application for exchanging information with the washing machine 10 and the dryer 20 is installed on the user's terminal 30. When the user's terminal 30 receives the first information or the second information, the dedicated application is automatically executed. The dedicated application is the ratio of the amount of finished cloth to the amount of dry cloth (hereinafter referred to as'first dehydration degree'), the ratio of the amount of finished cloth to the amount of wet cloth (hereinafter referred to as'second degree of dehydration'), and the estimated natural drying time comparing the first dehydration degree and the current humidity. Can be displayed. Accordingly, the user can recognize the natural drying time of the laundry when the dehydration is finished.

9, the washing machine 10 and the dryer 20 exchange information through wired or wireless communication. The dryer 20 receives the first spin rate, the second spin rate, and the cloth quality information of the laundry. The dryer 20 automatically sets a drying temperature and a drying time based on the first and second spinners, and the foam information of the laundry. The user puts the laundry into the dryer 20 and immediately presses the'start button' to quickly dry the laundry.

In the above, although specific embodiments of the present invention have been described and illustrated, the present invention is not limited to the described embodiments, and various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have. Therefore, such modifications or variations should not be individually understood from the technical spirit or point of view of the present invention, and the modified embodiments should be said to belong to the claims of the present invention.

S100,S200,S300,S400: Control method
S110, S210, S310, S410: Measurement of dry cloth amount (washing cloth amount)
S120,S220,S320,S420: Washing/rinsing
S130,S230,S330,S430: Measurement of wetness (dehydration amount)
S140,S240,S340,S440: dehydration progress
S141,S241: 1st speed (maximum rotation speed) rotation
S142,S242: dehydration progress
S143,S243,S342: Weight measurement
S144,S244: Determine whether dehydration is complete
S245: Determine whether the secondary dehydration has ended
S246: Determine the maximum rotational speed compared to the weight
S247: 1st speed reset
S341: rotation of the first speed (sensing rotational speed)
S343: Determination
S344: reset the maximum rotation speed
S345: Maximum rotation speed rotation
S441: End of dehydration
S442: Measurement of finished cloth
S443: Terminal first information (residual moisture information) transmission
S444: Transmitting the dryer's second information (residual moisture information)
10: washing machine 20: dryer
11: case 30: terminal
12: external assistant
13: House tank (laundry tank)
14: Pulsator
15: drive unit
16: suspension bar
17: weight sensor
18: drainage passage
19: drain pump
20: drain valve

Claims (13)

As a control method of a washing machine,
The washing machine,
A washing tank into which laundry is put;
An outer tub accommodating the washing tub;
A driving unit that rotates the washing tub;
A suspension bar for suspending the outer tank; And
It is installed on the suspension bar and includes a weight sensor for sensing the weight of the laundry,
The weight sensor measures the weight of the laundry while the drive unit rotates the washing tub to spin the laundry, and terminates the spinning of the laundry based on a weight measurement value,
How to control the washing machine. The method of claim 1,
The weight sensor measures the weight of the laundry while the driving unit rotates the washing tub at a constant speed at a first speed to dehydrate the laundry,
How to control the washing machine. The method of claim 2,
The weight sensor measures the weight of the laundry multiple times,
When the reduction rate of the weight measurement value is less than the first reference value, terminating the dehydration of the laundry based on this,
How to control the washing machine. The method of claim 3,
Measuring the amount of dry cloth in the laundry before dewatering the laundry,
When the reduction rate of the weight measurement value is less than the first reference value and the ratio of the weight measurement value to the dry cloth amount is less than or equal to a second reference value, terminating the dehydration of the laundry,
How to control the washing machine. The method of claim 4,
The first speed is set in inverse proportion to the weight of the laundry,
When the ratio of the weight measurement value to the dry cloth amount exceeds a second reference value, changing the first speed in response to the weight measurement value,
How to control the washing machine. The method of claim 3,
Before dewatering the laundry, the amount of wetness of the laundry is measured,
When the reduction rate of the weight measurement value is less than the first reference value and the reduction amount of the weight measurement value relative to the amount of the wet cloth is less than a third reference value, terminating the dehydration of the laundry,
How to control the washing machine. The method of claim 6,
The first speed is set in inverse proportion to the weight of the laundry,
When the amount of decrease of the weight measurement value relative to the amount of compress exceeds a third reference value, changing the first speed in response to the weight measurement value,
How to control the washing machine. The method of claim 2,
Measuring the amount of dry cloth in the laundry before dewatering the laundry,
When the ratio of the weight measurement value to the amount of dry cloth is less than or equal to a second reference value, terminating the dehydration of the laundry,
How to control the washing machine. The method of claim 2,
Before dewatering the laundry, the amount of wetness of the laundry is measured,
Terminating the dehydration of the laundry when the amount of decrease in the weight measurement value relative to the amount of the poultice is less than a third reference value,
How to control the washing machine. The method of claim 1,
Measuring the amount of dry cloth in the laundry before dewatering the laundry,
When the dehydration of the laundry is finished, the first information is transmitted to the user's terminal or dryer after measuring the finished cloth amount of the laundry,
The first information includes a ratio of the finished cloth amount to the dried cloth amount,
How to control the washing machine. The method of claim 1,
Before dewatering the laundry, the amount of wetness of the laundry is measured,
When the dehydration of the laundry is finished, second information is transmitted to the user's terminal or dryer after measuring the finished cloth amount of the laundry,
The second information includes a ratio of the amount of the finished cloth to the amount of the compress,
How to control the washing machine. The method of claim 2,
The weight sensor measures the weight of the laundry multiple times,
The washing tub is rotated at the maximum spinning speed and then the spinning of the laundry is terminated,
The maximum spin speed is set in inverse proportion to the reduction rate of the weight measurement value,
How to control the washing machine. The method of claim 2,
The weight sensor measures the weight of the laundry multiple times,
To determine the fabric quality of the laundry by the reduction rate of the weight measurement value,
How to control the washing machine.

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