KR20170120828A - Control method for washing machine - Google Patents

Abstract

The present invention provides a method to control a washing machine, capable of preventing or minimizing the scattering of water injected from a spray nozzle. According to one embodiment of the present invention, the washing machine comprises: an outer tub which is placed to have an opening facing upward for putting in laundry and receives an inner tub; a motor mounted on the bottom surface of the outer tub to rotate the inner tub; a cabinet containing the outer tub; a top cover covering the top of the cabinet and having an opening for laundry formed inside; the spray nozzle mounted on the top cover to inject washing water to the inside of the inner tub; a door to cover the opening for laundry; and a control panel installed on the upper side of the cabinet and including a control unit. In the washing machine control method of the present invention, a water injection operation through the spray nozzle is performed at one or more time points during all washing processes performed in the washing machine, a plurality of conditions to determine whether to allow the water injection operation to be performed at the time points are set by the control unit, and the water injection operation is performed only when at least two conditions of the plurality of conditions are satisfied.

Description

[0001] Control method for washing machine [0002]

The present invention relates to a method of controlling a washing machine, which is a kind of laundry processing apparatus.

Generally, a laundry processing apparatus can be defined as an apparatus for separating or dissolving contaminants impregnated in a laundry by friction between water and laundry using a rotating force of a drum containing water, detergents and laundry.

In particular, the washing machine, which is a type of laundry processing apparatus, can be divided into a top load type washing machine and a front load type washing machine according to the position of the opening of the drum for containing the laundry, that is, the position of the laundry loading port.

Specifically, the top-load type washing machine may include a drum having a pulsator having an upper surface opened and forming a water flow on the bottom surface, and a tub receiving the drum. A washing motor is mounted on the lower side of the pulsator, and the drum and the pulsator rotate in one direction or both directions about a vertical axis to perform washing, rinsing, and dewatering.

Recently, as disclosed in the following prior art 1, a top-load type washing machine in which a separate spray nozzle is provided on the top cover, in addition to a washing water supply port for supplying wash water mixed with detergent into the inside of the drum .

In the case of a top-load type washing machine provided only with a washing water supply port, there is a disadvantage that water mixed with detergent is fed only in one side lower part of the inner tank (corresponding to the drum) In order to solve this problem, the spray nozzle is provided on the top cover so that the bag is wetted evenly.

In addition, it is possible to spray water through the spray nozzle during the rinsing or dewatering stroke to achieve a specific purpose such as cleaning the outer surface of the outer tank.

However, when water is sprayed through the spray nozzle, the sprayed washing water may be scattered in various directions after being struck by the laundry or inner tank. A part of the water to be scattered may be introduced into a gap formed between the top cover and the upper surface of the outer tub, and then may be lowered along the surface of the cabinet to be caught in the base defining the bottom of the washing machine. If the amount of water to be accumulated in the base increases, it may leak to the outside of the washing machine and leak to the floor of the space where the washing machine is installed.

For example, when laundry is supplied through a washing water supply port in a state in which a large surface area laundry such as a bed sheet or a bed sheet is supplied, the laundry can be swollen to the vicinity of the laundry inlet. In this state, when water is sprayed onto the laundry through the spray nozzle, a part of the sprayed water can be scattered as a gap formed between the top cover and the upper surface of the cabinet.

As another example, when water is sprayed through the spray nozzle in a dewatering process in which laundry is rotated at a high speed, a part of the laundry or the water hitting the inner circumferential surface of the inner tub may be scattered as a gap formed between the top cover and the upper surface of the cabinet .

As a result, the water to be scattered falls down along the inner circumferential surface of the cabinet and becomes solid on the base. If the amount of water accumulated on the base increases, the water may leak to the outside of the washing machine.

Conventionally, a leak sensor is mounted on the base to prevent water leakage. However, the leak sensor operates when a leak is generated.

In addition, when the leakage sensor is mounted, the manufacturing cost increases as much as the sensor cost.

Prior Art 1: Korean Patent Laid-Open No. 10-2011-0009926 (January 31, 2011)

The present invention has been proposed in order to solve the problems of the washing machine equipped with the injection nozzle including the prior art 1 described above.

In other words, it is an object of the present invention to provide a control method of a washing machine that can essentially shut off or minimize the phenomenon that water splashes when water is sprayed from the spray nozzle.

According to another aspect of the present invention, there is provided a method of controlling a washing machine, the method comprising: an outer tub placed with an opening for inputting laundry upward, the inner tub receiving the inner tub; A washing machine comprising: a motor for rotating an inner tub; a cabinet for accommodating the outer tub; a top cover covering an upper surface of the cabinet and having a laundry loading port formed therein; A control method of a washing machine comprising a nozzle, a door covering the laundry inlet, and a control panel provided on the cabinet, the control panel including a control unit, wherein the water injection operation through the injection nozzle is performed by a washing And the water injection operation is performed at a time point when the water injection operation is performed And the water injection operation is performed only when at least two or more of the plurality of conditions are satisfied.

The plurality of conditions include a first condition that the amount of the washing water supplied to the inner tank or the water level of the washing water should be less than the predetermined amount or the set water level; A second condition in which the water pressure of the wash water supplied into the inner tank must be within the normal water pressure range; And a third condition that the amount of the puff to be sensed after completion of the draining operation should be less than the set level.

The time point at which the water injection operation is performed may include at least one of a first time point performed together with the rinsing operation and a second time point performed together with the dehydration operation.

If the water supply time for the washing cycle is equal to or falls within the error range, it is judged as normal water pressure. If the water supply time exceeds the set time, it is judged as a low water pressure. If the water supply time is shorter than the set time The water pressure is judged to be the water pressure in one hour, and when the water supply time is the second time shorter than the first time, it is determined that the water pressure is high.

The first condition and the second condition are determined before the washing cycle is started.

The third condition is characterized in that the rinsing operation and the drainage operation are completed and the dehydration operation is started.

In addition, when at least two of the first to third conditions are satisfied, the water injection and dehydration operations are simultaneously performed through the injection nozzle in the dehydration step.

If any one of the first to third conditions is not satisfied, only the dewatering operation is performed in the dewatering stroke.

Alternatively, the third condition is determined between a drainage operation and a dewatering operation performed before the rinsing operation, or between a drainage operation and a dewatering operation when the rinsing operation is repeated a plurality of times.

In addition, when at least two of the first to third conditions are satisfied, the water injection and the rinsing operation are simultaneously performed in the rinsing cycle through the injection nozzle.

If any one of the first to third conditions is not satisfied, a general rinsing operation is performed.

The method of controlling a washing machine according to an embodiment of the present invention having the above-described structure has the following advantages.

First, a plurality of conditions for allowing water to be jetted from the jetting nozzles are set, and a jetting operation (jet spraying operation) in which water is jetted from the jetting nozzles only when at least two of the set conditions are satisfied ), It is possible to minimize the phenomenon that the water collided against the inner surface of the laundry or the inner tank is scattered to the outside of the outer tank.

Secondly, it is not necessary to install a separate leak detection sensor on one side of the base by originally shutting off or minimizing scattering of water sprayed through the injection nozzle, thereby reducing the manufacturing cost of the washing machine.

According to the control method of the present invention, even if a part of water sprayed through the injection nozzle is scattered, the amount thereof is very small and evaporates before flowing down to the base, or a very small amount of water that can not be detected by the leak sensor is scattered It is not necessary to install a separate leak detection sensor.

1 is an external perspective view of a washing machine to which a control method according to an embodiment of the present invention is applied.
2 is a block diagram schematically showing a control structure of a washing machine according to an embodiment of the present invention.
3 is a flow chart showing a method for determining whether or not a condition for spraying water through an injection nozzle is satisfied.
FIG. 4 is a flowchart showing a time point at which water can be sprayed during a washing process of the washing machine according to the embodiment of the present invention. FIG.

The control method of the washing machine according to the embodiment of the present invention will be described in detail with reference to the drawings.

1 is an external perspective view of a washing machine to which a control method according to an embodiment of the present invention is applied.

1, a washing machine 1 according to an embodiment of the present invention has the same configuration as that of the washing machine disclosed in the prior art 1, and only the reference numerals are designated differently for convenience of description .

The washing machine 10 includes a case 11 including a cabinet 12 and a top cover 13, a control panel 7 disposed on a rear side of the top cover 13, , A base (5) defining the bottom of the case (11), legs (2) mounted on four corners of the bottom of the base, and an inner tank And a spray nozzle 50 mounted on one side of the rear surface of the top cover 13. The door 40 may be provided with a door 40 for covering the top surface of the outer tank 4,

In more detail, a laundry inlet 131 is formed in the top cover 13 to allow laundry to be introduced into the inner tank 6, and an upper surface of the inner tank 6 is also opened to form a laundry inlet. The upper surface of the outer tank 4 is also opened to enable the inner tank 6 to be inserted.

The injection nozzle 50 is a device for spraying washing water at a specific point in time. The door 40 may include a glass 40b and a frame 40a surrounding the edge of the glass 40b.

In addition, since various configurations provided in the case 11, for example, the suspension, balancer, pulsator and the like disclosed in the prior art 1 are applied to the structure of the washing machine of the present invention, a further description thereof will be omitted .

2 is a block diagram schematically showing a control structure of a washing machine according to an embodiment of the present invention.

2, a washing machine 1 according to an embodiment of the present invention includes a control unit 100, an input unit 70, a voltage sensing unit 32, a display unit 26, a memory 25, a drain pump 24 A motor drive unit 8, an injection nozzle 50, a timer 61, a flow rate sensing unit 65, and a water level sensing unit 60.

In detail, a motor 81 for rotating the inner tank 6 is connected to the motor driving unit 8 so that the driving and rotating speed of the motor 81 can be controlled by the motor driving unit 8. The motor driving unit 8 supplies power to the motor 81 for sensing the amount of cunts and the amount of the fluids put into the inner tank 6 and sets the rotation frequency of the motor 81 according to the supplied power Can be detected. And a quantity corresponding to the sensed rotational frequency value can be calculated.

More specifically, the display unit 26 may be provided on the control panel 7, and the input unit 70 may be provided on the control panel 7 in the form of a push button or a rotation button (jog shuttle button) (See Fig. 1).

In addition, the voltage sensing unit 32 senses a voltage variation applied to the motor driving unit 8.

The flow rate sensing unit 65 senses the amount of wash water supplied to the inner tank 6 and determines the amount of wash water to be supplied to the inner tank according to the amount of laundry introduced into the inner tank 6 The flow rate sensing unit 65 senses whether the set amount of wash water is supplied to the inner tank 6. The flow rate sensing unit 65 may include a flow meter.

The water level sensor 60 is a water level sensor for sensing the level of the washing water supplied to the inner tank 6, and may be mounted on one side of the outer tank. When the level of the washing water for washing is set in the control unit, the washing water is supplied until the water level is reached. Therefore, even if the water level is the same depending on the type of the laundry, the amount of laundry water to be supplied may vary. For example, when a pillow or a bed sheet having a good absorbency is put into the inner tank, and when a sports garment or an undergarment having poor absorbability is put into the inner tank, the amount of washing water to reach the same level will vary.

The timer 61 is used to measure the driving time of the motor 81, the washing cycle, the rinsing cycle, the progress time of the dewatering cycle or the like, or measure the time taken for the supplied washing water to reach the set water level.

After the washing, rinsing and dewatering are completed, the drain pump 24 discharges water collected in the drain pump 24 to the outside of the washing machine 1.

Hereinafter, a method of controlling a washing machine according to an embodiment of the present invention will be described in detail with reference to flowcharts.

FIG. 3 is a flowchart showing a method for determining whether or not a condition for spraying water through the spray nozzle is satisfied.

Referring to FIG. 3, in order to spray wash water through the spray nozzle, at least two conditions among a plurality of conditions must be satisfied. That is, when only one of the plurality of conditions is satisfied, the spraying through the spray nozzle is not performed, thereby minimizing the scattering of the wash water when spraying the washing water through the spray nozzle.

The embodiment shown in FIG. 3 relates to a control method for allowing a water injection operation through the injection nozzle to be performed only when a plurality of conditions are all satisfied.

 More specifically, when the laundry 1 is supplied with power and a washing process (a washing cycle, a rinsing cycle, and a dewatering cycle) is started, the amount of laundry loaded into the inner tank 6 is sensed (S11). To this end, power is supplied from the motor driving unit 8 to the motor 81 so that the motor 81 rotates. The motor drive unit 8 senses the rotation frequency hz of the motor 81 and transmits the sensed rotation frequency hz to the control unit 100. The memory 25 stores information on the amount of washing water for each rotational frequency of the motor 81 and the amount of washing water or the water level of the washing water in the form of a look-up table. Therefore, the control unit 100 uploads the look-up table from the memory 25 and extracts a mass corresponding to the detected frequency.

When the amount of the laundry is determined, the supply amount of the washing water or the water level of the washing water corresponding to the determined laundry amount is determined (S12). Here, the water level of the washing water is detected by the water level sensing unit 60 provided at one side of the outer tank 4, as described above. Then, the batch determination and the water quantity or wash water level determination processes (S11 and S12) can be substantially simultaneously performed.

In detail, the water level of the washing water supplied to the inner tank 6 can be divided into a plurality of steps. As an example, the first to the tenth water levels can be distinguished. However, it is to be noted that the above-mentioned separated level is not limited to 10 levels.

When the water supply amount or the water level of the wash water is determined, it is determined whether the determined water supply amount or the water level of the wash water is less than the set amount or the set water level (S13). For example, when the water supply level is divided into 10 water levels, it is determined that the water injection condition is not satisfied (S20) if the water level is 7 or more. However, the set water level for determining whether or not the water jetting condition is satisfied is not limited to this, and the optimum water level can be determined through experiments. Likewise, in the case of the water supply amount, it is possible to divide the water supply amount into a plurality of water amounts, and to determine that the water injection condition is satisfied only when the determined water supply amount is less than the set water amount. The set quantity or water level condition can be defined as a first condition.

On the other hand, if the water supply amount or the water level of the washing water is determined, the water supply is performed until the determined water supply amount or the water level is reached (S14). At the same time as the water supply is started, the water pressure of the water supply passage connected to the washing machine 1 is sensed (S15). The water pressure may mean the supply pressure of water supplied to the area or building where the washing machine 1 is installed. The pressure of the supplied washing water may be defined as the time taken for the supplied washing water to reach a certain water level or a certain water level. For example, it may be defined as a water supply amount corresponding to the laundry amount or a time taken to reach the water level of the washing water.

The memory 25 stores the water pressure values for the low water pressure, the normal water pressure, the heavy water pressure, and the high water pressure in the form of a lookup table, and the controller 100 reads the water pressure- And the water pressure sensed by the water pressure sensing unit can be compared with the lookup table.

For example, it can be classified into a low water pressure, a normal water pressure, a heavy water pressure, and a high water pressure depending on the determined water supply amount or the time taken to reach the water level. Specifically, when the time required for reaching the determined water supply amount or water level is t1, the normal water pressure is set to the normal water pressure. In the case of t2, which takes longer than t1, . In this way, the time corresponding to the water pressure or the water pressure is set for each water supply amount or the washing water level, and this information can be stored in the memory 25 in the form of a look-up table. The normal water pressure is not limited to a specific water pressure value, but can be determined as a normal water pressure when the specific water pressure value is within the up-and-down error range.

Accordingly, if it is determined that the sensed water pressure is outside the normal water pressure range, it is determined that the water injection condition is not satisfied (S20). The hydraulic pressure condition may be defined as a second condition. For example, if it is determined that the water pressure is low, the water injection through the water injection nozzle 50 may not be smoothly performed, and in the case of heavy water pressure or high water pressure, scattering may occur during water injection. Therefore, it is considered that the water jetting condition is satisfied only when the sensed water pressure is within the normal water pressure range.

When the process of determining whether the first and second conditions are satisfied is completed, the amount of the puddle is detected before the dewatering operation after completion of the draining operation (S17).

Specifically, the draining operation and the dewatering operation are performed when the washing machine is transferred from the washing machine to the rinsing machine, and when the machine is moved from the rinsing machine to the dewatering machine. That is, the washing cycle may include a washing operation, a draining operation, and a dewatering operation, and the rinsing cycle may include a rinsing operation and a draining operation. And, the detection of the amount of the moisture can be performed before the dewatering operation after the drainage operation.

More specifically, even if drainage is completed, the laundry is faded with water, and when water is absorbed depending on the type of the laundry, a considerable difference may occur in the volume and shape of the laundry compared to the dry condition.

In the case of a pillow, for example, it maintains a relatively bloated state in the dry state, but when the water is absorbed, the load becomes heavy, while the volume tends to decrease. Then, it may be difficult to predict clearly whether the water hitting the pillow when the water is sprayed from the injection nozzle 50 is scattered to the outside of the outer tank.

In order to minimize the unpredictability, a process of detecting the amount of the cloth is performed. The detection of the amount of the moisture can be understood as a process of predicting not only the load of the wet laundry absorbing water at present but also the volume of the wet laundry using the rotation frequency of the motor 81. [

In detail, power is applied to the motor 81 to extract the rotational frequency value of the motor 81, and the amount of the wet cloth can be defined as a rotational frequency value of the motor. This is the same as the amount of charge put into the inner tank 6 before the start of washing is defined as the value of the rotation frequency of the motor, but only the number is different.

The memory 25 may store a plurality of levels of the amount of the fume, and the amount of the fumes corresponding to the detected rotational frequency of the motor and a level value corresponding to the amount of the fume of level can be stored in the form of a look-up table. Therefore, when the rotational frequency of the motor is sensed, it can be determined to which level the amount of the wet cloth belongs.

As an example, the sensed amount of the fingertips is divided into levels of 0 to 5, and the amount of the fingertips can be stored for each level and stored in the form of a lookup table.

If it is determined that the detected amount of the humidified water is less than the set level (S18), it is determined that the water spraying condition is satisfied (S19). Otherwise, the water spraying condition is not satisfied (S20). For example, assuming that the threshold level is four levels, if the level value corresponding to the detected amount of the fuzzy volume is less than four levels, the water jetting condition is satisfied, and if the level is four or more, the water jetting condition is not satisfied can see. The condition of the amount of the cloth can be defined as a third condition.

In summary, in order for the washing water to be sprayed through the water spray nozzle 50, the first condition to the third condition must be satisfied. In other words, if at least one of the above three conditions is not satisfied, the jetting condition through the water jetting nozzle 50, that is, the water jetting condition is not satisfied, and the water jetting is performed at the point when the water jetting should be performed .

However, as mentioned above, since the control method shown in Fig. 3 is only one example, it can be programmed to satisfy the water jetting condition if only two of the above first to third conditions are satisfied Leave.

When water is sprayed through the water spray nozzle 50 in a state in which the water spray condition is not satisfied, a part of the sprayed water hits the surface of the laundry or the inner tank 6 and then splashes to spray the outer tank 4 and the cabinet 12 It is likely to enter the space between them. Therefore, it is a main feature of the control method according to the embodiment of the present invention that the water injection is performed only when at least two conditions are all satisfied in order to block this possibility beforehand. The water spray through the water spray nozzle 50 may be referred to as a jet spray.

Hereinafter, when the water injection through the water injection nozzle is possible will be described in detail with reference to the flowchart.

FIG. 4 is a flowchart showing a time point at which water can be sprayed during the washing process of the washing machine according to the embodiment of the present invention.

Referring to FIG. 4, after power is applied to the washing machine 1, input of laundry and input of washing conditions are completed, when the start button is pressed, water supply is started (S100).

When the water supply is completed, the washing cycle (W) is performed. Here, the first condition and the second condition for judging whether or not the discharge condition is satisfied in the water supply process before the start of the washing step (W) are determined in advance.

Specifically, when entering the washing step (W), the inner tub 6 rotates in the lateral direction to perform a washing operation for decomposing contaminants adhered to the laundry (S110). When the washing operation is completed, a drain operation is performed (S120). After completion of the draining operation, a dewatering operation is performed (S140) so that the detergent seeping into the laundry is separated and discharged as much as possible.

The dehydration operation is performed before the rinsing cycle, so that the rinsing cycle can be performed with cleaner washing water, and as a result, the number of rinsing cycles can be minimized.

On the other hand, the water injection operation through the water injection nozzle can be performed together with the rinsing operation. In order to minimize the amount of water required for washing in a foreign country where water regulation is severe, rinsing water may be sprayed through the spray nozzle 50 instead of supplying washing water through the laundry inlet in the rinsing process. When the rinse water is sprayed through the spray nozzle 50, the water sprayed onto the laundry causes the laundry to be wet with water, and the pollutants and detergent residing in the laundry can be separated from the laundry. As a result, There is an advantage that the rinsing can be performed in an amount smaller than the amount.

Therefore, if the water injection operation is to be performed in the rinsing cycle, it is determined whether or not the water injection condition is satisfied before the water discharge operation S120 of the washing cycle W is completed and the dewatering cycle S140 starts (S130). Here, the process of determining whether the water jetting condition is satisfied is determined by first determining whether the third condition is satisfied by the controller, and then determining whether or not at least two of the first to third conditions are satisfied It can be said that it means to judge.

If it is determined that the water spraying condition is satisfied, the water spray rinsing operation is performed after completion of the dewatering operation (S140) of the washing process (W) (S160). If it is determined that the water spray condition is unsatisfactory, A general rinsing operation using water supplied through the wash water supply unit may be performed (S170). The water spray rinsing operation means that the water spray operation is performed simultaneously with the rinsing operation.

Then, when the water spray rinse or general rinse operation is completed, a drain operation is performed (S180). Here, the rinsing operation and the drain operation performed after completion of the rinsing operation can be defined as being included in the rinsing operation (L).

When the drainage operation of the rinsing cycle L is completed, a dewatering process is performed. In the present embodiment, it is described that the rinsing step L is performed only once, then enters the dewatering stroke, but it is not limited thereto. For example, after about three rinsing cycles (L) have been performed, they can be controlled to enter the dewatering cycle.

In order to determine the type of the first rinsing operation (rinsing or rinsing with water) when the rinsing process L is performed a plurality of times, a dewatering operation (S140) after the drainage operation (S120) ), It is judged whether or not the water jetting condition is satisfied (the third condition, that is, detecting the amount of the wetting). In order to determine the type of the rinsing operation from the second time onward, it is determined whether the water spraying condition is satisfied after completion of the drainage operation (S180) in the rinsing step L, that is, do. When the type of the rinsing operation is determined, the rinsing operation is performed after the dewatering operation is performed. Therefore, when a plurality of rinsing cycles are performed, the rinsing cycle includes a dehydration operation.

On the other hand, the dewatering stroke, in which the rinsing cycle L is finally completed and is performed, may be said to be slightly different in terms of the dewatering operation performed before the rinsing operation and the purpose. In other words, the dewatering operation performed before the rinsing operation is performed to make the rinsing operation as clean as possible, and the dewatering operation performed after completion of the rinsing operation L is a final dewatering process, To remove as much as possible, so that drying can be performed quickly. Prior to the final dewatering run, the moisture that permeates the laundry is clean water that contains little contaminants and detergents.

When water is sprayed together with the final dewatering operation, water to be sprayed passes through the inner tank 6 and strikes against the surface of the outer tank 4, thereby separating the foreign substances adhered to the inner surface of the outer tank, and the separated foreign matter is separated from the laundry It can be discharged to the outside of the washing machine together with water. As described above, when water is sprayed in the final dewatering stroke, the sanitary condition of the outer tank is improved.

Accordingly, when the last rinsing cycle is completed and the drainage is completed, it is determined whether the water injection condition is satisfied in the control unit before the dewatering cycle (S190).

In detail, if the water jetting condition is satisfied, a water jetting dewatering process in which a dewatering process is performed together with water jetting is performed (S200), and a general dewatering process without water jetting is performed in an unsatisfactory condition (S210).

In the flowchart according to the embodiment shown in FIG. 4, it is explained that, when the water injection condition is satisfied, the water injection operation is performed in both the rinsing and final dewatering stages, but it is not limited thereto.

That is, the water injection operation may be programmed to be performed only in one of the rinsing operation and the final dehydration operation, even if the water injection condition is satisfied. It is noted that this can be appropriately adjusted in consideration of the water regulations of the area where the washing machine is installed and the electric charges according to the power consumption amount.

Claims (11)

A motor for rotating the inner tub mounted on a bottom surface of the outer tub; a cabinet for accommodating the outer tub; and a cover for covering the upper surface of the cabinet A door covering the laundry inlet; and a controller provided on the cabinet, wherein the controller controls the operation of the controller, A control method for a washing machine including a control panel,
Wherein the water injection operation through the injection nozzle is performed at least one time during the entire washing process performed in the washing machine,
A plurality of conditions for determining whether the water injection operation is to be performed at a time point when the water injection operation is performed are set in the control unit,
Wherein the water jetting operation is performed only when at least two of the plurality of conditions are satisfied. The method according to claim 1,
The plurality of conditions include:
A first condition that the amount of the washing water supplied to the inner tank or the water level of the washing water should be less than the predetermined amount or the set water level;
A second condition in which the water pressure of the wash water supplied into the inner tank must be within the normal water pressure range; And
And a third condition that the amount of the fluid detected after completion of the drainage operation should be less than the set level. 3. The method of claim 2,
When the water injection operation is performed,
A first point of time performed with the rinsing operation,
And a second time point that is performed together with the dewatering operation. The method of claim 3,
If the water supply time for the washing cycle is equal to or falls within the error range, it is determined as normal water pressure,
When the water supply time exceeds the set time, it is determined that the water pressure is low.
If the water supply time is a first time shorter than the set time,
And when the water supply time is a second time shorter than the first time, it is determined that the water pressure is high. 3. The method of claim 2,
Wherein the first condition and the second condition are determined before the washing cycle is started. 6. The method of claim 5,
Wherein the third condition is determined before the rinsing operation and the drain operation are completed and the dewatering process is started. The method according to claim 6,
Wherein, when at least two of the first to third conditions are satisfied, water spraying and dewatering operations are simultaneously performed through the spray nozzle in the dewatering stroke. The method according to claim 6,
Wherein if no one of the first to third conditions is satisfied, only the dewatering operation is performed in the dewatering step. 6. The method of claim 5,
Wherein the third condition is determined between a drain operation and a dewatering operation performed before the rinsing operation or between a drain operation and a dewatering operation when the rinsing operation is repeatedly performed a plurality of times. 10. The method of claim 9,
Wherein, when at least two conditions of the first to third conditions are satisfied, the water injection and the rinsing operation are simultaneously performed in the rinsing cycle through the injection nozzle. 10. The method of claim 9,
Wherein if the first to third conditions are not satisfied, the general rinsing operation is performed.

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