JP6921770B2 - Washing machine - Google Patents

Description

The present invention relates to a washing machine.

The washing machine described in Patent Document 1 includes a water level setting means and a water supply amount detecting means. The water level setting means sets the water level of the washing machine. The water supply amount detecting means detects the water supply amount. Further, the washing machine determines whether or not the water level is at the set water level after the start of the washing operation, and if it does not reach the water level, water is supplied again.

The water level after the start of the washing operation is determined by the following procedure. First, in a state where the washing operation of the washing machine is not stopped, the set water level value is set higher than when the water is stationary, or the value from the water supply amount detecting means is set lower and corrected. Then, the corrected value is compared with the value from the water level setting means.

Japanese Patent No. 2698425

Generally, capacity sensing of the laundry is performed before water is supplied into the washing tub to determine the set water level. The set water level indicates the water level in the washing tub during the washing operation. In the capacity sensing, first, the amount of laundry is calculated. Then, the set water level is determined based on the amount of laundry.

However, when the laundry contains water, such as when the laundry is wet before washing, the amount of laundry calculated by volume sensing becomes larger than the actual amount of laundry. In this case, the set water level is higher than the appropriate water level according to the amount of laundry. As a result, when the laundry is washed, there is a risk that more water will be used than necessary for the amount of laundry.

An object of the present invention is to provide a washing machine capable of improving water saving performance.

According to the first aspect of the present invention, the washing machine includes a washing tub, a water supply unit, a stirring unit, a water level detection unit, a water supply treatment unit, and a determination unit. The washing tub can accommodate laundry. The water supply unit supplies water into the washing tub. The stirring unit stirs the water in the washing tub. The water level detection unit detects the water level in the washing tub. The water supply treatment unit controls the water supply unit and the stirring unit to perform water supply treatment for supplying water into the washing tub. The determination unit determines whether or not the water supply process has been completed. The water supply treatment includes a unit treatment. In the unit treatment, the first treatment is performed while the laundry is contained in the washing tub, and then the second treatment is performed. The first treatment indicates a treatment in which the water supply unit supplies water to the washing tub by a predetermined unit water supply time or a predetermined unit water supply amount. The second treatment indicates a treatment in which the stirring unit stirs the water in the washing tub. The determination unit determines whether or not the water supply treatment is completed based on the first water level and the second water level. The first water level indicates the water level in the washing tub after the completion of the first treatment and before the start of the second treatment. The second water level indicates the water level in the washing tub after the completion of the second treatment.

According to the present invention, water saving performance can be improved.

It is a perspective view of a washing machine. It is sectional drawing of a washing machine. It is a block diagram of a washing machine. It is a block diagram which shows the operation of a control device. It is a flow chart which shows the unit processing. (A) It is a figure which shows the state which the capacity sensing unit performs capacity sensing of laundry. (B) It is a figure which shows the set water level. (A) It is a figure which shows the 1st process. (B) It is a figure which shows the set water level. (C) It is a figure which shows the 2nd process. (D) It is a figure which shows the correction setting water level. It is a figure which shows the washing tub at the time of completion of a water supply process.

An embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and the description is not repeated.

The washing machine 100 of the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view of the washing machine 100.

As shown in FIG. 1, the washing machine 100 includes a casing 1, a lid 2, and an operation display unit 3. The casing 1 has a hollow shape. The casing 1 is made of, for example, metal or synthetic resin. An opening 1a is formed in the upper part of the casing 1. The lid 2 opens and closes the opening 1a. Each of the lid 2 and the operation display unit 3 is provided on the upper portion of the casing 1. The washing machine 100 may further have a drying function of the laundry X.

Next, the washing machine 100 will be further described with reference to FIG. FIG. 2 is a cross-sectional view of the washing machine 100.

As shown in FIG. 2, the washing machine 100 further includes a top plate 4, a base 5, a water tub 6, a washing tub 7, a stirring blade 8, a balancer 9, a drive unit 10, and a transmission mechanism 11. Be prepared.

The top plate 4 is made of, for example, a synthetic resin. The top plate 4 is fixed to the upper part of the casing 1. The top plate 4 rotatably supports the lid 2. The top plate 4 is provided with an operation display unit 3.

The base 5 is made of, for example, a synthetic resin. The base 5 is fixed to the bottom of the casing 1.

Each of the water tub 6 and the washing tub 7 has a hollow shape. The upper part of each of the water tub 6 and the washing tub 7 is open. Each of the water tub 6 and the washing tub 7 is housed in the casing 1.

The washing tub 7 is arranged inside the water tub 6. The washing tub 7 is rotatably supported. Water can be stored in the washing tub 7.

With the lid 2 open, the laundry X is put into the washing tub 7 through the opening 1a.

The stirring blade 8 is provided inside the washing tub 7 and is located at the bottom of the washing tub 7. The stirring blade 8 is rotatably supported.

The balancer 9 suppresses the vibration of the washing tub 7 when the washing tub 7 rotates at high speed. The balancer 9 is formed in a ring shape. The balancer 9 is arranged above the washing tub 7.

Each of the drive unit 10 and the transmission mechanism 11 is provided in the casing 1. Each of the drive unit 10 and the transmission mechanism 11 is arranged below the water tank 6.

The drive unit 10 rotates each of the stirring blade 8 and the washing tub 7. The drive unit 10 includes, for example, a motor.

The transmission mechanism 11 includes, for example, a gear and a clutch. The transmission mechanism 11 is interposed between the drive unit 10 and the stirring blade 8 and the washing tub 7. The transmission mechanism 11 operates by, for example, an electromagnetic force. The transmission mechanism 11 can transmit the power of the drive unit 10 to each of the stirring blade 8 and the washing tub 7. Further, the transmission mechanism 11 can cut off the transmission of the power of the drive unit 10 to each of the stirring blade 8 and the washing tub 7.

The transmission mechanism 11 includes a stirring shaft 11a and a dehydration shaft 11b. The stirring shaft 11a and the dehydration shaft 11b have a double shaft structure. A dehydration shaft 11b is arranged outside the stirring shaft 11a. Each of the stirring shaft 11a and the dehydration shaft 11b is connected to the drive unit 10.

The stirring blade 8 functions as a pulsator for stirring and flowing the water in the washing tub 7. The stirring blade 8 is attached to the stirring shaft 11a. The stirring blade 8 transmits the power of the drive unit 10 via the stirring shaft 11a. As a result, the stirring blade 8 rotates. The stirring blade 8 is an example of the stirring unit of the present invention.

The washing tub 7 is attached to the dehydration shaft 11b. The washing tub 7 transmits the power of the drive unit 10 via the dehydration shaft 11b. As a result, the washing tub 7 rotates.

The washing machine 100 further includes a water supply valve 12 and a water supply hose 13.

The water supply valve 12 is, for example, a solenoid valve. The water supply valve 12 is interposed between the faucet and the water supply hose 13. The water supply hose 13 leads into the washing tub 7.

A detergent case capable of storing detergent may be provided between the water supply valve 12 and the water supply hose 13. In this case, the water is supplied from the water supply valve 12 to the detergent case and then supplied into the washing tub 7 via the water supply hose 13. As a result, the detergent can be supplied into the washing tub 7 together with the water.

When the water supply valve 12 is opened, water is supplied into the washing tub 7 via the water supply hose 13. On the other hand, when the water supply valve 12 is closed, water is not supplied to the washing tub 7 via the water supply hose 13. As a result, the amount of water supplied into the washing tub 7 can be adjusted by opening and closing the water supply valve 12. The water supply valve 12 is an example of the water supply unit of the present invention.

Next, the washing machine 100 will be further described with reference to FIG. FIG. 3 is a block diagram of the washing machine 100.

As shown in FIG. 3, the operation display unit 3 receives an instruction to the washing machine 100. The operation display unit 3 includes an input unit 3a and a display unit 3b. The input unit 3a includes a group of operation keys. The display unit 3b displays various information. The display unit 3b is, for example, a display such as an LCD (Liquid Crystal Display) or an ELD (Electro Luminescence Display). The display unit 3b may include a touch panel and function as an input unit 3a.

The washing machine 100 further includes a water level detection unit 14, a storage unit 16, and a control device 17.

The water level detection unit 14 detects the water level in the washing tub 7. The water level detection unit 14 has, for example, an air trap and a pressure sensor. The air trap is provided at the bottom of the washing tub 7. The water level detection unit 14 detects the pressure in the air trap with the pressure sensor, and detects the water level in the washing tub 7 based on the pressure in the air trap.

The current detection unit 15 detects the current supplied to the drive unit 10.

The storage unit 16 includes a storage device. The storage device includes a main storage device (for example, a semiconductor memory) such as a ROM (Read Only Memory) and a RAM (Random Access Memory), and may further include an auxiliary storage device (for example, a hard disk drive). The main storage device and / or the auxiliary storage device stores various computer programs executed by the control device 17.

The control device 17 includes processors such as a CPU (Central Processing Unit) and an MPU (Micro Processing Unit). The control device 17 controls each element of the washing machine 100. Specifically, the processor of the control device 17 executes a computer program stored in the storage device to include the input unit 3a, the display unit 3b, the drive unit 10, the transmission mechanism 11, and the water supply valve 12. , The water level detection unit 14 and the storage unit 16 are controlled.

The control device 17 includes a control unit 17a, a capacitance sensing unit 17b, a calculation unit 17c, a water supply treatment unit 17d, a determination unit 17e, a washing operation unit 17f, and a rinsing operation unit 17g. Specifically, the processor of the control device 17 executes a computer program stored in the storage device to execute the control unit 17a, the capacity sensing unit 17b, the calculation unit 17c, the water supply treatment unit 17d, the determination unit 17e, and the washing operation. It functions as a unit 17f and a rinsing operation unit 17g.

Next, the first operation of the control device 17 will be described with reference to FIGS. 4 to 8. FIG. 4 is a block diagram showing the operation of the control device 17.

As shown in FIG. 4, in step S10, the input unit 3a receives an instruction of a washing operation for operating the washing machine 100. As a result, the washing machine 100 starts the washing operation. In the first embodiment, the washing operation indicates a washing operation for washing the laundry X.

In step S20, the capacity sensing unit 17b performs capacity sensing of the laundry X and calculates the amount of the laundry X. The amount of laundry X specifically indicates the capacity of laundry X.

FIG. 6A is a diagram showing a state in which the capacity sensing unit 17b is performing capacity sensing of the laundry X. With the water in the washing tub 7 discharged, the laundry X is supplied into the washing tub 7 to perform capacity sensing.

As shown in FIG. 6A, the capacity sensing unit 17b controls the drive unit 10 to rotate the stirring blade 8 (see FIG. 2) when performing capacity sensing of the laundry X. For example, the stirring blade 8 rotates in the first direction and then rotates in the second direction opposite to the first direction a predetermined number of times (for example, twice). When the stirring blade 8 rotates, the stirring blade 8 receives a load from the laundry X.

The capacity sensing unit 17b calculates the amount of laundry X by performing capacity sensing. In the first embodiment, the capacitance sensing unit 17b calculates the amount of laundry X based on the load received by the stirring blade 8.

The load received by the stirring blade 8 can be regarded as, for example, a current supplied to the drive unit 10. The reason is that the load received by the stirring blade 8 has a correlation with the current supplied to the drive unit 10. Specifically, as the load received by the stirring blade 8 increases, the torque of the stirring shaft 11a increases, and the current supplied to the drive unit 10 increases.

The capacity sensing unit 17b calculates the amount of laundry X by using, for example, the first correspondence information. The first correspondence information is a table or a graph showing the correspondence relationship between the current supplied to the drive unit 10 and the amount of laundry X. The first correspondence information is stored in advance in the storage unit 16. The capacitance sensing unit 17b calculates the amount of laundry X based on the first correspondence information and the current of the drive unit 10 detected by the current detection unit 15.

As shown in FIG. 4, in step S30, the calculation unit 17c calculates the total water supply time based on the amount of laundry X calculated in step S20. The total water supply time indicates the water supply time to the washing tub 7 corresponding to the amount of the laundry X.

The calculation unit 17c calculates the total water supply time using, for example, the second correspondence information. The second correspondence information is a table or a graph showing the correspondence relationship between the amount of laundry X and the total water supply time. The second correspondence information is stored in advance in the storage unit 16.

FIG. 6B is a diagram showing the set water level Y. As shown in FIG. 6B, the set water level Y indicates the water level in the washing tub 7 when the water supply valve 12 supplies water into the washing tub 7 over the total water supply time calculated in step S30. When the water supply valve 12 supplies water, it means that the water supply valve 12 is in an open state.

A normal washing machine supplies water to the washing tub 7 over a total water supply time. In this case, the following difference occurs depending on whether or not the laundry X is dry when it is put into the washing tub 7.

If the laundry X is dry when it is put into the washing tub 7, the total water supply time becomes an appropriate value. The reason is that the correspondence of the second correspondence information is usually set on the premise that the laundry X is dry. As a result, when the laundry X is dry, the set water level Y becomes an appropriate water level according to the amount of the laundry X.

On the other hand, when the laundry X is wet when it is put into the washing tub 7, the weight of the laundry X is heavier than when the laundry X is dry. Therefore, in step S20, the load received by the stirring blade 8 during capacity sensing increases, so that the amount of laundry X calculated by the capacity sensing unit 17b becomes larger than the actual amount of laundry X. As a result, the total water supply time becomes longer than the appropriate value, and the set water level Y becomes higher than the appropriate water level.

Therefore, when the laundry X is put into the washing tub 7, the set water level Y changes depending on whether the laundry X is wet or not.

The washing machine 100 of the first embodiment supplies water to the washing tub 7 by the procedure shown in steps S40 to S60 below without supplying water to the washing tub 7 over the total water supply time.

As shown in FIG. 4, in step S40, the water supply treatment unit 17d determines the unit water supply time T based on the total water supply time calculated in step S30. The water supply treatment unit 17d determines, for example, a length time of one-fifth or more and one-third or less of the total water supply time as the unit water supply time T.

In step S50, the water supply treatment unit 17d starts the water supply treatment. The water supply treatment indicates a treatment of supplying water into the washing tub 7. Water supply treatment includes single or multiple unit treatment.

In step S60, the water supply treatment unit 17d performs unit treatment.

The unit processing will be described with reference to FIGS. 5 and 7 (a) to 7 (d). FIG. 5 is a flow chart showing unit processing. The unit process includes a first process and a second process.

As shown in FIG. 5, in step S61, the water supply treatment unit 17d performs the first treatment of the unit treatment.

7 (a) and 7 (b) are views showing the first process.

As shown in FIGS. 7 (a) and 7 (b), in the first treatment, the water supply valve 12 is calculated in step S40 in the washing tub 7 with the laundry X accommodated in the washing tub 7. The water supply processing unit 17d controls the water supply valve 12 so that water is supplied only for the unit water supply time T. The water supply processing unit 17d has a function of a timer, and the unit water supply time T is counted by the timer. When the water supply valve 12 supplies water to the washing tub 7 for the unit water supply time T, the first treatment is completed. When the first process is completed, the second process is started.

In FIG. 7B, the first water level Y1 indicates the water level in the washing tub 7 after the completion of the first treatment and before the start of the second treatment. The first water level Y1 is detected by the water level detecting unit 14.

As shown in FIG. 5, in step S62, the water supply treatment unit 17d performs the second treatment of the unit treatment.

7 (c) and 7 (d) are diagrams showing the second process.

As shown in FIGS. 7 (c) and 7 (d), in the second treatment, the water supply treatment unit 17d is driven so that the stirring blade 8 rotates while the laundry X is housed in the washing tub 7. The unit 10 is controlled. As a result, the stirring blade 8 stirs the water in the washing tub 7. The stirring blade 8 rotates at a predetermined speed in a predetermined rotation direction. The stirring blade 8 rotates at a speed of 100 rpm or more and 120 rpm or less for a time of 30 seconds or more and 1 minute or less, for example. When the rotation of the stirring blade 8 is completed, the second process is completed.

In FIG. 7D, the second water level Y2 indicates the water level in the washing tub 7 after the completion of the second treatment. The second water level Y2 is detected by the water level detecting unit 14. When the water level detection unit 14 detects the second water level Y2 after the second processing is completed, the unit processing is completed. As a result, the process proceeds to step S70. That is, the unit process includes a first process, a second process, a process of detecting the first water level Y1, and a process of detecting the second water level Y2.

As shown in FIGS. 7B and 7D, in step S70, the determination unit 17e makes the water level difference (Y1-Y2) of the second water level Y2 with respect to the first water level Y1 equal to or less than the predetermined threshold value DT. Judge whether or not. The predetermined threshold DT is a positive real number. The predetermined threshold value DT is set in advance and is stored in the storage unit 16.

When the water level difference (Y1-Y2) is equal to or less than the predetermined threshold value DT (Yes, Y1-Y2 ≦ DT in step S70), the process proceeds to step S80.

When the water level difference (Y1-Y2) is not equal to or less than the predetermined threshold value DT (No, Y1-Y2> DT in step S70), the process proceeds to step S60. As a result, the water supply treatment unit 17d repeats the unit treatment of step S60 without discharging the water in the washing tub 7 until the water level difference (Y1-Y2) becomes equal to or less than the predetermined threshold value DT.

In step S80, the determination unit 17e determines that the water supply process has been completed.

The principle that the determination unit 17e determines that the water supply treatment is completed will be described.

In step S62 (see FIGS. 5 and 7 (c)), when the water in the washing tub 7 is agitated, the laundry X absorbs the water and the air contained in the laundry X becomes the laundry. Get out of X. As a result, the second water level Y2 in the washing tub 7 after stirring is lower than the first water level Y1 in the washing tub 7 before stirring.

Then, each time the single treatment shown in step S60 is repeated, the amount of water absorbed by the laundry X during stirring and the amount of air exiting the laundry X decrease, and the water level difference (Y1-Y2) becomes smaller. The smaller the water level difference (Y1-Y2), the greater the degree of inundation of the laundry X in the washing tub 7. That is, there is a correlation between the water level difference (Y1-Y2) and the degree of inundation of the laundry X. As a result, when the water level difference (Y1-Y2) becomes equal to or less than the predetermined threshold value DT, the determination unit 17e determines that the laundry X is submerged in the washing tub 7 to the extent that the washing operation can be performed, and the water supply treatment is performed. It becomes possible to judge that it is completed.

FIG. 8 is a diagram showing the washing tub 7 when the water supply treatment is completed. In FIG. 8, the modified set water level Y3 indicates the water level in the washing tub 7 when the water supply treatment is completed. Further, the modified set water level Y3 shows an example of the set water level of the present invention.

As shown in FIG. 4, in step S90, the washing operation unit 17f performs a washing operation for washing the laundry X. Specifically, the washing operation unit 17f controls the drive unit 10 so that the stirring blade 8 rotates. As a result, the stirring blade 8 rotates to wash the laundry X. The washing operation is performed when the water level in the washing tub 7 is the correction set water level Y3. Further, the detergent has already been put into the washing tub 7 before the treatment in step S90. As a result, the process ends.

As described above with reference to FIGS. 4 to 8, in a state where water is supplied into the washing tub 7 for the unit water supply time T and the laundry X is wet, the determination unit 17e determines the first water level Y1. And the second water level Y2, it is determined whether or not the water supply treatment is completed. Therefore, when the laundry X is put into the washing tub 7, it is possible to prevent the correction set water level Y3 from changing depending on whether the laundry X is dry or not. As a result, when the laundry X is wet, it is possible to prevent the correction set water level Y3 from becoming higher than the appropriate water level according to the amount of the laundry X, and it is possible to improve the water saving performance.

Further, the water supply treatment unit 17d repeats the unit treatment without discharging the water in the washing tub 7 until the water level difference (Y1-Y1) becomes equal to or less than the predetermined threshold value DT. Therefore, it is possible to effectively bring the modified set water level Y3 closer to the appropriate water level.

Further, the water supply treatment unit 17d determines the time having a length of one-fifth or more and one-third or less of the total water supply time as the unit water supply time T. Therefore, it is possible to suppress the supply of an excessive amount of water into the washing tub 7 with respect to the amount of the laundry X.

Further, the washing operation unit 17f wash the laundry X in a state where the water level in the washing tub 7 is the correction set water level Y3. Therefore, the washing operation unit 17f can wash the laundry X while saving water.

The embodiments of the present invention have been described above with reference to the drawings (FIGS. 1 to 8). However, the present invention is not limited to the above-described embodiment, and can be implemented in various aspects without departing from the gist of the present invention (for example, (1) to (5)). In addition, various inventions can be formed by appropriately combining the plurality of components disclosed in the above embodiments. For example, some components may be removed from all the components shown in the embodiments. In order to make the drawings easier to understand, each component is schematically shown, and the number of each component shown may differ from the actual one due to the convenience of drawing. Further, each component shown in the above embodiment is an example, and is not particularly limited, and various modifications can be made without substantially deviating from the effect of the present invention.

(1) Based on the amount of laundry X calculated in step S20 (see FIG. 4), the control unit 17a may change each of the unit water supply time T and the predetermined threshold value DT. For example, as the amount of laundry X increases, the control unit 17a lengthens the unit water supply time T and increases the predetermined threshold value DT. As a result, it becomes possible to effectively set each of the unit water supply time T and the predetermined threshold value DT according to the amount of the laundry X.

(2) As shown in step S60 and step S70 (see FIG. 4), when the unit process is repeated, the control unit 17a may change the unit water supply time T according to the number of times the unit process is repeated. For example, as the number of repetitions of the unit process increases, the control unit 17a shortens the unit water supply time T. As a result, it becomes possible to effectively determine the modified set water level Y3 according to the amount of laundry X.

(3) In the first embodiment of the present invention, in step S30 (see FIG. 4), the calculation unit 17c calculates the total water supply time. In step S40, the water supply treatment unit 17d determines the unit water supply time T. Then, in the first treatment shown in step S61 (see FIG. 5), the water supply treatment unit 17d controls the water supply valve 12 to supply water to the washing tub 7 for a unit water supply time T. However, the present invention is not limited to this.

Hereinafter, the second embodiment of the present invention will be described with reference to FIGS. 4 and 5.

In the first embodiment, the timing of supplying water into the washing tub 7 is defined by the water supply time as described above. On the other hand, in the second embodiment, the timing of supplying water into the washing tub 7 is defined by the amount of water supplied.

In the second embodiment, in step S30 shown in FIG. 4, the calculation unit 17c calculates the total water supply amount. The total amount of water supplied indicates the amount of water supplied to the washing tub 7 corresponding to the amount of laundry X. In this case, the calculation unit 17c calculates the amount of water supplied to the washing tub 7 by using, for example, the third correspondence information. The third correspondence information is a table or a graph showing the correspondence relationship between the amount of laundry X and the total water supply amount, and is stored in advance in the storage unit 16. Then, in step S40, the water supply treatment unit 17d determines the unit water supply amount based on the total water supply amount. The water supply treatment unit 17d determines, for example, a water amount of one-fifth or more and one-third or less of the total water supply amount as a unit water supply amount. Then, in the first treatment shown in step S61 shown in FIG. 5, the water supply treatment unit 17d controls the water supply valve 12 to supply water to the washing tub 7 by a unit amount of water supply.

Further, in the second embodiment, the washing machine 100 includes a water amount detecting unit for detecting the amount of water in the washing tub 7. Then, in step S61, when the water supply treatment unit 17d supplies water to the washing tub 7 by the unit water supply amount, whether or not the unit water supply amount of water is supplied into the washing tub 7 based on the detection value of the water amount detection unit. Is determined.

In the second embodiment, the washing machine 100 may detect the amount of water in the washing tub 7 by using the water level detecting unit 14 instead of the water amount detecting unit. In this case, the total water supply amount and the water amount indicated in the unit water supply amount mean the water level.

(4) In the first embodiment and the second embodiment of the present invention, in step S90 (see FIG. 9), the washing operation unit 17f (see FIG. 3) performs the washing operation. However, the present invention is not limited to this.

Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 2 to 4 and 8.

In the third embodiment, in step S90 shown in FIG. 4, instead of the washing operation, the rinsing operation unit 17g (see FIG. 3) may perform a rinsing operation for rinsing the laundry X. That is, even when the washing operation is not specified and the rinsing operation is specified via the input unit 3a in step S10 (see FIG. 4), the water supply treatment unit 17d is similarly specified as in the case where the washing operation is specified. The unit treatment shown in step S60 may be performed to supply water having a modified set water level Y3 into the washing tub 7. In this case, when the water level in the washing tub 7 is the correction set water level Y3, the rinsing operation unit 17g rotates the stirring blade 8 by the driving unit 10 to rinse the laundry X. As a result, the rinsing operation unit 17g can rinse the laundry X while saving water.

When both the washing operation and the rinsing operation are specified in step S10 (see FIG. 4) via the input unit 3a, the washing operation and the washing operation are performed with the water level in the washing tub 7 being the correction set water level Y3. Each of the rinsing operations may be performed.

Hereinafter, a detailed description will be given with reference to FIGS. 2, 3, and 8. First, when the water supply treatment shown in step S80 is completed, the washing operation unit 17f performs the washing operation with the water level in the washing tub 7 being the correction set water level Y3. Then, after the washing operation is completed, the water used in the washing operation is discharged from the washing tub 7. Then, water is supplied into the washing tub 7 via the water supply valve 12 until the water level in the washing tub 7 reaches the corrected set water level Y3. Then, the rinsing operation unit 17g performs the rinsing operation while the water level in the washing tub 7 is the correction set water level Y3. As a result, the washing operation unit 17f and the rinsing operation unit 17g can wash and rinse the laundry X while saving water.

(5) The washing machine 100 of the first to third embodiments is a vertical washing machine. However, the present invention is not limited to this. The washing machine of the present invention may be a washing machine provided with a washing tub, performing capacity sensing, and calculating the total water supply time or the total water supply amount. For example, the washing machine of the present invention may be a drum type washing machine. In the case of a drum-type washing machine, the washing tub functions as the stirring unit of the present invention.

The present invention is available in the field of washing machines.

7 Washing tub 8 Stirring blade (stirring part)
12 Water supply valve (water supply section)
14 Water level detection unit 17b Capacity sensing unit 17c Calculation unit 17d Water supply processing unit 17e Judgment unit 17f Washing operation unit 17g Rinse operation unit 100 Washing machine DT Predetermined threshold value T Unit Water supply time X Laundry Y1 First water level Y2 Second water level Y3 Correction Set water level (set water level)

Claims (7)

A washing tub that can accommodate laundry and
The water supply unit that supplies water to the washing tub and
A stirring unit that stirs the water in the washing tub and
A water level detection unit that detects the water level in the washing tub and
A water supply treatment unit that controls the water supply unit and the stirring unit to perform water supply treatment to supply water into the washing tub, and a water supply treatment unit.
It is equipped with a determination unit that determines whether or not the water supply treatment has been completed.
The water supply treatment includes a unit treatment.
In the unit treatment, the first treatment is performed while the laundry is contained in the washing tub, and then the second treatment is performed.
The first treatment indicates a treatment in which the water supply unit supplies water to the washing tub by a predetermined unit water supply time or a predetermined unit water supply amount.
The second treatment indicates a treatment in which the stirring unit stirs the water in the washing tub.
The determination unit determines whether or not the water supply treatment is completed based on the first water level and the second water level.
The first water level indicates the water level in the washing tub after the completion of the first treatment and before the start of the second treatment.
The washing machine, wherein the second water level indicates the water level in the washing tub after the completion of the second treatment. The washing machine according to claim 1, wherein when the difference between the first water level and the second water level becomes equal to or less than a predetermined threshold value, the determination unit determines that the water supply process is completed. The second aspect of the present invention, wherein the water supply treatment unit repeats the unit treatment without discharging the water in the washing tub until the difference between the first water level and the second water level becomes equal to or less than the predetermined threshold value. Washing machine. A capacity sensing unit that calculates the capacity of the laundry and
It is further equipped with a calculation unit that calculates the total water supply time into the washing tub corresponding to the capacity of the laundry.
The washing machine according to any one of claims 1 to 3, wherein the water supply treatment unit determines the unit water supply time based on the total water supply time. The washing machine according to claim 4, wherein the water supply treatment unit determines a time having a length of one-fifth or more and one-third or less of the total water supply time as the unit water supply time. Further provided with a washing operation unit for washing the laundry when the water level in the washing tub is set to the set water level.
The washing machine according to any one of claims 1 to 5, wherein the set water level indicates the water level in the washing tub when the water supply treatment is completed. The washing machine according to claim 6, further comprising a rinsing operation unit for rinsing the laundry when the water level in the washing tub is at the set water level.

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