washing machine

Abstract

To provide a washing machine which suppresses the residue of a liquid agent between a tank for storing a liquid agent and a washing tub, in the case where a liquid agent is supplied from the plurality of tanks in a predetermined step.SOLUTION: A washing machine includes: a washing tub for storing laundry; a first tank for storing a first liquid agent supplied to the washing tub; a second tank for storing a second liquid agent supplied to the washing tub; a first automatic liquid agent input device connected to the first tank and discharging the first liquid agent; a second automatic liquid agent input device connected to the second tank and discharging the second liquid agent; a liquid agent discharge flow passage for connecting the first automatic liquid agent input device and the second automatic liquid agent input device with the washing tub; a water supply valve connected to the liquid agent discharge flow passage and supplying water to the washing tub; and a control part. The control part executes water supply by the water supply valve, first automatic input by the first automatic liquid agent input device, and second automatic input by the second automatic liquid agent input device in parallel, and in such a manner that the water supply finishes after the first automatic input and the second automatic input.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present disclosure relates to a washing machine.

Background Art

[0002] For example, Patent Document 1 discloses a washing machine equipped with an automatic liquid supply device.

[0003] The washing machine described in Patent Document 1 includes a washing tub that houses laundry, a plurality of tanks that store liquids, an automatic supply device that supplies the liquids stored in the tanks to the washing tub, and a pump that sends water toward the washing tub. A water passage communicating with the washing tub is formed below the automatic supply device. The detergent supplied from the automatic supply device and the water sent out by the pump pass through the water passage.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the washing machine described in Patent Document 1, when supplying liquids from a plurality of tanks in a predetermined process, there is a possibility that the liquids may remain upstream of the washing tub. There is still room for improvement in terms of suppressing the remaining of the liquids between the tank for storing the liquids and the washing tub.

[0006] Therefore, an object of the present disclosure is to solve the above problems, and when supplying liquids from a plurality of tanks in a predetermined process, to provide a washing machine capable of suppressing the remaining of the liquids between the tank for storing the liquids and the washing tub.

Means for Solving the Problems

[0007] A washing machine according to one aspect of the present disclosure includes a washing tub for holding laundry, a first tank for holding a first liquid supplied to the washing tub, a second tank for holding a second liquid supplied to the washing tub, a first automatic liquid dispenser connected to the first tank for discharging the first liquid, a second automatic liquid dispenser connected to the second tank for discharging the second liquid, a liquid discharge channel connecting the first and second automatic liquid dispensers to the washing tub, a water supply valve connected to the liquid discharge channel for supplying water to the washing tub, and a control unit, wherein the control unit performs water supply by the water supply valve, first automatic dispensing by the first automatic liquid dispenser, and second automatic dispensing by the second automatic liquid dispenser in parallel, so that water supply ends after the first and second automatic dispensing.

[0008] A method according to one aspect of the present disclosure is a method for controlling a washing machine comprising: a washing tub for containing laundry; a first tank for containing a first liquid supplied to the washing tub; a second tank for containing a second liquid supplied to the washing tub; a first automatic liquid dispenser connected to the first tank for discharging the first liquid; a second automatic liquid dispenser connected to the second tank for discharging the second liquid; a liquid discharge channel connecting the first and second automatic liquid dispensers to the washing tub; and a water supply valve connected to the liquid discharge channel for supplying water to the washing tub, wherein the water supply by the water supply valve, the first automatic dispensing by the first automatic liquid dispenser, and the second automatic dispensing by the second automatic liquid dispenser are performed in parallel, such that the water supply ends after the first and second automatic dispensing. [Effects of the Invention]

[0009] According to this disclosure, when liquids are supplied from multiple tanks in a predetermined process, a washing machine can be provided that suppresses the residue of liquids between the tanks storing the liquids and the washing tub. [Brief explanation of the drawing]

[0010] [Figure 1] schematic cross-sectional view of a washing machine according to the embodiment of this disclosure [Figure 2] Partial perspective view of the automatic feeding unit [Figure 3] Top view of the automatic feeding unit [Figure 4] Perspective cross-sectional view of the automatic input unit [Figure 5] Perspective view of the tank, chemical agent input device, and chemical agent discharge flow path [Figure 6A] Schematic diagram of the chemical agent discharge flow path [Figure 6B] Schematic diagram of the chemical agent discharge flow path [Figure 6C] Schematic diagram of the chemical agent discharge flow path [Figure 7] Graph showing the operation of the washing machine [Figure 8A] Graph showing the operation of the washing machine [Figure 8B] Graph showing the operation of the washing machine [Figure 8C] Graph showing the operation of the washing machine [Figure 9] Graph showing the operation of the washing machine [Figure 10] Flow chart of the operation of the washing machine [Figure 11] Flow chart of the operation of the washing machine [Figure 12A] Flow chart of the operation of the washing machine [Figure 12B] Flow chart of the operation of the washing machine [Figure 12C] Flow chart of the operation of the washing machine [Figure 12D] Flow chart of the operation of the washing machine [Figure 13] Flow chart of the operation of the washing machine [Figure 14] Diagram showing an example where the water supply and the automatic input of the chemical agent start at different times [Figure 15] Diagram showing an example of jointly controlling the automatic input of the detergent and the automatic input of the bleach

Mode for Carrying Out the Invention

[0011] (Embodiment) The washing machine according to the embodiment of the present disclosure will be described.

[0012] [Overall Configuration] Figure 1 is a schematic cross-sectional view showing a washing machine 1 according to an embodiment of the present disclosure. In this specification, "liquid agent" refers to a liquid agent used for processing laundry 15 such as clothes, and includes detergents, fabric softeners, bleaches, deodorants, neutral detergents, etc.

[0013] As shown in Figure 1, the washing machine 1 comprises a housing 2, an outer tub 3, a washing tub 4, a drive unit 5, an automatic dispensing unit 6, a connecting channel 8, a water supply valve 10, a drain valve 11, a control unit 12, a storage unit 13, and a display unit 14.

[0014] <Enclosure> The casing 2 is a component that forms the exterior of the washing machine 1. The front of the casing 2 is provided with an opening 20 and a door 21 that can be opened and closed to cover the opening 20.

[0015] <Outer tank> The outer tub 3 is a roughly cylindrical member located inside the housing 2 and has the function of holding washing water. The outer tub 3 may also be called a water tank. The outer tub 3 has a cylindrical portion 34 and a bottom portion 36 that closes one end of the cylindrical portion 34. The central axis V0 of the outer tub 3 passes through the center of the bottom portion 36. The central axis V0 is inclined with respect to the horizontal. The outer tub 3 has an opening 31 facing the opening 20 of the housing 2 and is sealed and connected to the opening 20 of the housing 2 by a bellows 32. The outer tub 3 is provided with openings 33 and 35 for water passage. Opening 33 is an opening connected to the connecting channel 8, and opening 35 is a drain for draining water from the outer tub 3 to the outside.

[0016] To detect the amount of water supplied to the outer tank 3, a water level sensor 90 is provided in the outer tank 3. In this embodiment, the water level sensor 90 detects the water level in the outer tank 3.

[0017] Furthermore, in the following description, the horizontal direction along the central axis V0 will be defined as the front-rear direction M (Figure 1), and the horizontal direction perpendicular to the plane containing the central axis V0 will be defined as the width direction K (Figure 2). The front-rear direction M has a front side M1 toward the opening 31 and a rear side M2 ​​toward the bottom 36, and the width direction K has an outer side K1 away from the central axis V0 and a central side K2 toward the central axis V0.

[0018] <Washing machine drum> The washing tub 4 is a roughly cylindrical member that is rotatably mounted inside the outer tub 3 around a central axis V0 and accommodates laundry 15 such as clothes. The washing tub 4 may also be called an inner tub or drum. The washing tub 4 has numerous through holes 40. The through holes 40 connect the washing tub 4 and the outer tub 3, allowing washing water and detergent to move from the washing tub 4 to the outer tub 3. The washing tub 4 has openings 41 that face the opening 20 of the housing 2 and the opening 31 of the outer tub 3.

[0019] A fabric weight sensor 91 is provided in the washing tub 4 to detect the amount of laundry 15 contained within it. In this embodiment, the fabric weight sensor 91 detects the weight of the laundry 15. More specifically, the fabric weight sensor 91 detects the weight of the laundry 15 by measuring the load torque (torque current value) of the motor of the drive unit 5.

[0020] <Drive Unit> The drive unit 5 is a component that rotates the washing tub 4 around its central axis V0. The drive unit 5, for example, has a motor that rotates the washing tub 4.

[0021] <Automatic feeding unit> The automatic dispensing unit 6 is a unit that automatically supplies a predetermined amount of liquid agent, determined by the control unit 12, from a liquid agent storage tank to the outer tub 3. During the washing and rinsing processes of a washing course, the automatic dispensing unit 6 supplies the appropriate type and amount of liquid agent to the outer tub 3, for example, according to the amount and type of laundry 15. The automatic dispensing unit 6 is connected to the outer tub 3 via a connecting channel 8.

[0022] The automatic dispensing unit 6 comprises a case 61, tanks 62A, 62B, and 62C (tanks 62B and 62C are not shown), liquid dispensing devices 63A, 63B, and 63C (liquid dispensing devices 63B and 63C are not shown), a liquid discharge channel 64, a manual dispensing section 65, and a water supply solenoid valve 66.

[0023] <Connection channel> The connecting channel 8 is a channel for supplying liquid from the automatic dispensing unit 6 to the outer tank 3. The connecting channel 8 extends downward from the automatic dispensing unit 6 to the opening 33 of the outer tank 3.

[0024] <Water supply valve> The water supply valve 10 is a connection port for connecting a hose that supplies water to the outer tank 3 via the automatic supply unit 6. The water supply valve 10 is located on the upper part of the housing 2.

[0025] <Drain valve> The drain valve 11 is configured to be openable and closable, and when opened, it is a valve for draining the water stored in the outer tank 3 through the opening 35 of the outer tank 3. The drain valve 11 is located at the bottom of the housing 2.

[0026] <Department Head> The control unit 12 is a component that controls the operation of the washing machine 1. It includes a general-purpose processor such as a CPU or MPU that realizes predetermined functions by executing a program. The control unit 12 realizes functions by calling and executing a program stored in the memory unit 13. The control unit 12 is not limited to realizing predetermined functions through the cooperation of hardware and software, but may also be a hardware circuit specifically designed to realize predetermined functions.

[0027] The control unit 12 includes an input standard amount setting unit 12A that accepts the setting of the input standard amount, and an input amount correction setting unit 12B that accepts the correction setting of the liquid amount to be added. The input standard amount and the correction setting are used to calculate the amount of liquid to be added when the washing machine 1 is in operation. The input standard amount may be the amount of liquid to be added per unit weight of laundry or per unit volume of water. The input standard amount may also be a coefficient corresponding to, for example, concentrated detergent or regular detergent. The correction setting is a setting performed to correct the amount of liquid to be added. The correction setting may be a setting based on, for example, the user's preference (more, normal, less), or a setting based on learning from past washing history. Furthermore, the amount of liquid to be added when the washing machine 1 is in operation may be calculated not only based on the input standard amount and the correction setting, but also based on a coefficient set for each operating course.

[0028] The input standard amount setting and correction setting can be entered by operating the washing machine 1 or by operating the application on the user's smartphone. The input standard amount setting may be set by the brand name of the liquid agent entered by the user. The correction setting may be automatically controlled by the application or the washing machine 1.

[0029] <Storage section> The memory unit 13 is a recording medium for recording various types of information. The memory unit 13 can be implemented as, for example, flash memory, an SSD (Solid State Device), a hard disk, other storage devices, or a combination thereof as appropriate. The memory unit 13 stores information related to the control performed by the control unit 12, and various types of information detected by sensors 90 and 91.

[0030] <Display> The display unit 14 is a display device that displays various information such as images and text. The display unit 14 is composed of a liquid crystal display, an organic EL display, or the like. The display unit 14 is located on the front of the housing 2 in a position visible to the user of the washing machine 1. The display unit 14 displays, for example, the washing course currently in progress, the remaining time of the washing course, and instructions regarding manual loading. Alternatively, an application run on the user's smartphone or other terminal may be used instead of the display unit 14.

[0031] Next, the components of the automatic supply unit 6 will be explained with reference to Figures 2 and 3. Figure 2 is a perspective view of a part of the automatic supply unit 6. Figure 3 is a top view of the automatic supply unit 6. In Figure 2, the water supply solenoid valve 66 and the supply channel 67 are omitted.

[0032] <Case> As shown in Figure 2, the case 61 is a component that houses the tanks 62A, 62B, and 62C that constitute the automatic dispensing unit 6, as well as the manual dispensing unit 65.

[0033] Here, the front surface M1 of case 61 is referred to as the front surface 56, and the rear surface M2 of case 61 is referred to as the back surface 57. Liquid injection devices 63A, 63B, and 63C and a liquid discharge channel 64 are connected to the back surface 57 of case 61.

[0034] As shown in Figure 3, a supply channel 67 is formed in the upper part of the case 61. The supply channel 67 forms multiple independent paths along the outer circumference of the case 61. Water is supplied to the inside of the case 61 from the water supply solenoid valve 66 through each of these paths. Therefore, the water supplied from the water supply solenoid valve 66 flows into the case 61 once before being supplied to the outer tank 3.

[0035] <Water supply solenoid valve> The water supply solenoid valve 66 is a mechanism that distributes water from the water supply valve 10 (Figure 1) to the supply channel 67 (Figure 5) selected by the control unit 12.

[0036] <tank> As shown in Figures 2 and 3, the case 61 houses three tanks 62A, 62B, and 62C arranged in the width direction K. In other words, tank 62B is positioned between tanks 62A and 62C, and tanks 62A and 62C are separated by tank 62B.

[0037] Tanks 62A, 62B, and 62C are containers for storing liquids used in the washing and rinsing processes. The liquids stored in tanks 62A, 62B, and 62C are of different types. In this embodiment, bleach is stored in tank 62A, fabric softener in tank 62B, and detergent in tank 62C. The bleach stored in tank 62A and the detergent stored in tank 62C are used in the washing process (first process), and the fabric softener stored in tank 62B is used in the rinsing process (second process). On the other hand, the liquids stored in at least two of tanks 62A, 62B, and 62C may be of the same type. Furthermore, tanks 62B and 62C may be capable of storing only a specific type of liquid, while tank 62A may be configured to store liquids selected from a plurality of types.

[0038] Tanks 62A, 62B, and 62C are removable from the case 61 to allow users to easily clean the inside or refill the liquid. In this embodiment, the types of liquids (detergent, fabric softener, bleach, etc.) to be refilled into tanks 62A, 62B, and 62C are fixed in type for tanks 62B and 62C. On the other hand, the type of liquid in tank 62A can be changed according to the user's preference. That is, tank 62A may be refilled with a liquid of a different type than bleach, such as a neutral detergent or a disinfectant / deodorizer.

[0039] Figure 4 is a perspective cross-sectional view of the automatic feeding unit 6. As shown in Figure 4, the depths L1, L2, and L3 of tanks 62A, 62B, and 62C increase in order. Therefore, the capacities of tanks 62A, 62B, and 62C increase in order.

[0040] <Manual input section> As shown in Figure 2, the manual dispensing unit 65 is a mechanism for the user to manually dispense a single dose of laundry detergent. The dispensed laundry detergent flows from the case 61 through the connecting channel 8 (Figure 1) into the outer tub 3 (Figure 1) in the dispensed amount. The dispensed laundry detergent may be in liquid or powder form.

[0041] <Liquid dispensing device> The liquid dispensing devices 63A, 63B, and 63C are devices that draw a predetermined amount of liquid from tanks 62A, 62B, and 62C and discharge it into the liquid dispensing channel 64. The liquid dispensing devices 63A, 63B, and 63C are arranged in a line in the width direction K along the arrangement of tanks 62A, 62B, and 62C. Specifically, liquid dispensing device 63A is located behind tank 62A M2, liquid dispensing device 63B is located behind tank 62B M2, and liquid dispensing device 63C is located behind tank 62C M2. That is, liquid dispensing device 63B is located between liquid dispensing device 63A and liquid dispensing device 63C, and liquid dispensing devices 63A and 63C are separated by liquid dispensing device 63B. In this configuration, the suction ports of the liquid dispensing devices 63A, 63B, and 63C are connected to the respective tanks 62A, 62B, and 62C through openings formed in the rear surface 57 of the case 61.

[0042] The discharge ports of the liquid dispensing devices 63A, 63B, and 63C are connected to the liquid dispensing channel 64. Considering the arrangement of the liquid dispensing devices 63A, 63B, and 63C, the discharge port of liquid dispensing device 63A and the discharge port of liquid dispensing device 63C are separated by the presence of liquid dispensing device 63B. Therefore, in the liquid dispensing channel 64, the position where the bleach dispensed by liquid dispensing device 63A falls and the position where the detergent dispensed by liquid dispensing device 63C falls are separated.

[0043] In this embodiment, the liquid dispensing devices 63A and 63C dispense the liquid during the washing process, and the liquid dispensing device 63B dispenses the liquid during the rinsing process.

[0044] In this embodiment, the liquid dispensing devices 63A, 63B, and 63C have a common structure.

[0045] <Liquid dispensing channel> The liquid discharge channel 64 is a flow channel member that supplies liquid and water to the outer tank 3 (Figure 1) via the case 61. The inlet and outlet of the liquid discharge channel 64 are connected to the case 61 through openings (not shown) formed on the back surface 57 of the case 61. The liquid discharge channel 64 is connected from below to three liquid supply devices 63A, 63B, and 63C.

[0046] Here, we will explain the water flow in the automatic dispensing unit 6. Water flows into case 61 from the water supply valve 10 through the water supply solenoid valve 66 and the supply channel 67. Some of the water that flows into case 61 flows below tanks 62A to 62C and flows into the outer tank 3 through the connecting channel 8. Also, some of the water that flows into case 61 flows from case 61 through the inlet into the liquid agent discharge channel 64, where it merges with the liquid agent. After that, the water, together with the liquid agent, flows back into case 61 from the outlet of the liquid agent discharge channel 64 and then flows into the outer tank 3 through the connecting channel 8.

[0047] The liquid discharge channel 64 extends downward inclined toward the outside K1. Therefore, in the liquid discharge channel 64, the fluid (e.g., water W0) flows along gravity from the upper end to the lower end of the liquid discharge channel 64. In addition, in accordance with the inclination of the liquid discharge channel 64, the liquid input devices 63A, 63B, and 63C have a stepped arrangement located sequentially downward. Furthermore, considering the direction of water flow in the liquid discharge channel 64, the liquid input devices 63A, 63B, and 63C are sequentially connected to the downstream liquid discharge channel 64.

[0048] Figure 5 is a perspective view of the tanks 62A-62C, the liquid dispensing devices 63A-63C, and the liquid discharge channel 64. As shown in Figure 5, the liquid dispensing devices 63A-63C are connected to the tanks 62A-62C and the liquid discharge channel 64, respectively. The liquid dispensing devices 63A-63C are connected to the tanks 62A-62C in the front-to-back direction M and to the liquid discharge channel 64 in the up-to-down direction. Therefore, the liquid dispensing devices 63A-63C each draw liquid from the tanks 62A-62C in the front-to-back direction M and discharge it downward toward the liquid discharge channel 64.

[0049] [Operation] In the configuration described above, an example of the operation of the washing machine 1 during the washing process of the washing course will be explained with reference to Figures 6A to 6C. Figures 6A to 6C are schematic diagrams of the liquid discharge channel 64.

[0050] During the washing process, the washing machine 1 performs automatic detergent dispensing (first automatic dispensing), automatic bleach dispensing (second automatic dispensing), and water supply in parallel. In other words, at least a portion of the automatic detergent dispensing is performed simultaneously with the automatic bleach dispensing and water supply. To put it another way, at least a portion of the automatic bleach dispensing is performed simultaneously with the automatic detergent dispensing and water supply. The bleach discharged from the liquid dispensing device 63A, the detergent discharged from the liquid dispensing device 63C, and the water supplied from the water supply valve 10 reach the outer tub 3 through the liquid dispensing channel 64.

[0051] For example, if water is not supplied after the automatic dispensing of bleach P1 and detergent P2, as shown in Figure 6A, the discharged bleach P1 and detergent P2 are not carried by water and may adhere to and remain on the inner surface of the liquid dispensing channel 64 after discharge.

[0052] As shown in Figure 6B, even after the automatic dispensing of bleach P1 and detergent P2, if water supply continues, the bleach P1 and detergent P2 are carried by the water X1 and supplied to the outer tank 3. Therefore, it is possible to suppress the residue of bleach P1 and detergent P2 in the liquid dispensing channel 64.

[0053] Furthermore, because the liquid dispensing device 63A and the liquid dispensing device 63C are separated, mixing of the bleach P1 and the detergent P2 can be suppressed. When the bleach is discharged, the concentration of the bleach increases in the liquid discharge channel 64 downstream of the liquid dispensing device 63A. The discharged bleach flows through the liquid discharge channel 64, begins to mix with water, and passes under the liquid dispensing device 63B in a slightly mixed state. The bleach continues to flow through the liquid discharge channel 64, mixes with water further, and passes under the liquid dispensing device 63C in a well-mixed state. Because the concentration decreases due to mixing with water, contact between the bleach and the detergent is suppressed, making it difficult for the bleach to mix with the detergent. This suppresses the generation of by-products due to direct contact between different liquids, and prevents by-products from remaining in the liquid discharge channel 64. In other words, by preventing the mixing of bleach and detergent, which are different types of liquids, in their undiluted state, the risk of by-product formation and the risk of the by-products blocking the liquid dispensing channel 64 can be reduced. In this specification, by-products are substances insoluble in water, such as solids that are generated when a negatively charged solution and a positively charged solution are mixed.

[0054] The viscosity of detergent P2 is, for example, between 200 mPa·s and 600 mPa·s, and the viscosity of bleach P1 is, for example, between 10 mPa·s and 300 mPa·s. The viscosity of detergent P2 is generally higher than that of bleach P1. Therefore, detergent P2 is more likely to remain in the liquid discharge channel 64 compared to bleach P1. By arranging the liquid input device 63C that discharges detergent P2 downstream of the liquid input device 63A that discharges bleach P1, the distance that detergent P2 travels through the liquid discharge channel 64 is reduced. As a result, the residue of detergent P2 can be further suppressed.

[0055] Furthermore, since the liquid injection devices 63A to 63C include positive displacement pumps, liquid can be drawn from tanks 62A to 62C into the flowing water. This disclosure is applicable as long as the liquid is discharged from the liquid injection devices 63A to 63C into the liquid discharge channel 64 through which water flows. For this reason, the liquid injection devices 63A to 63C may have a liquid pump and a check valve structure that restricts the flow in one direction on the secondary side of the pressure fluctuation section, and the liquid pump path and the water supply path may be merged downstream of the check valve structure. For example, in this embodiment, the liquid injection devices 63A to 63C include positive displacement pumps, a check valve is provided downstream of the piston of the positive displacement pump, and the check valve is connected to the liquid discharge channel downstream of the check valve. This disclosure is preferably used in positive displacement pumps where a check valve structure is easily provided. A centrifugal pump or an aspirator structure may be provided instead of a positive displacement pump.

[0056] On the other hand, as shown in Figure 6C, if the water supply ends before automatic dispensing, the bleach P1 and detergent P2 remain in the liquid dispensing channel 64, dry, and solidify on the inner surface of the liquid dispensing channel 64.

[0057] To avoid the clogging shown in Figure 6C, the water supply is controlled so that the expected end of the automatic dispensing of bleach P1 and detergent P2 occurs after the automatic dispensing of the liquid dispensing channel 64, allowing the channel to be washed with water. In this embodiment, water is supplied for a predetermined time T5 after the automatic dispensing is complete. The predetermined time T5 is a threshold value stored in the memory unit 13 beforehand, and is the time required to flow the water necessary to clean the liquid dispensing channel 64. The predetermined time T5 is set according to the design specifications of the automatic dispensing unit 6, such as the length and cross-sectional area of ​​the liquid dispensing channel 64.

[0058] On the other hand, the time required for water supply depends on the installation environment of the washing machine 1, making it difficult to determine in advance when water supply will end (when the water level in the outer tub 3 reaches a predetermined level). Therefore, in this embodiment, first, the end of water supply is predicted, and then the start times of each process are staggered so that the predicted end of water supply occurs after the end of automatic dispensing. Furthermore, if the actual end of water supply occurs earlier than the predicted end of water supply, additional water is supplied to wash the liquid dispensing channel 64.

[0059] Figures 7 to 9 are graphs showing the control operation of the washing machine 1 during the washing process. In the explanation below, the time taken for automatic detergent dispensing will be referred to as the detergent dispensing time T1, and the time taken for automatic bleach dispensing will be referred to as the bleach dispensing time T2. The time expected to take from the start of water supply to reaching the target water level will be referred to as the expected water supply time T3, and the actual time taken from the start of water supply to reaching the target water level will be referred to as the actual water supply time T6. The control unit 12 determines the control of the washing machine 1 to be executed based on the detergent dispensing time T1, the bleach dispensing time T2, and the expected water supply time T3.

[0060] (Reference control) As shown in Figure 7, if the detergent dispensing time T1 and the bleach dispensing time T2 are sufficiently shorter than the expected water supply time T3, the control unit 12 performs standard control.

[0061] In the standard control, the automatic dispensing of detergent, the automatic dispensing of bleach, and the water supply are started at predetermined timings. Specifically, the standard control includes a first control that starts the water supply at a predetermined timing, a second control that starts the automatic dispensing of detergent at a predetermined timing, and a third control that starts the automatic dispensing of bleach at a predetermined timing. In this embodiment, when the control unit 12 executes the first control, the second control, and the third control, the automatic dispensing of detergent, the automatic dispensing of bleach, and the water supply are started simultaneously at the start time s2.

[0062] The expected water supply time T3 ends after the detergent dispensing time T1 and bleach dispensing time T2 have finished. After the detergent dispensing time T1 and bleach dispensing time T2 have finished, a water supply time of at least a predetermined time T5 is performed. Therefore, the bleach P1 and detergent P2 can be thoroughly washed away in the liquid dispensing channel 64 (Figure 6B).

[0063] Standard control is performed, for example, when supplying concentrated detergent and a small amount of bleach to the washing tub 4. In this case, the standard amount of detergent and bleach per unit volume of water is small, and the detergent dispensing time T1 and the bleach dispensing time T2 are sufficiently shorter than the expected water supply time T3.

[0064] (Priority deployment control) If the detergent dispensing time T1 and the bleach dispensing time T2 become long, it becomes difficult to secure a predetermined water supply time T5. Therefore, if the detergent dispensing time T1 or the bleach dispensing time T2 is longer than the expected water supply time T3, or if the difference between the detergent dispensing time T1 or the bleach dispensing time T2 and the expected water supply time T3 is small, as shown in Figures 8A to 8C, the control unit 12 performs pre-dispensing control. Pre-dispensing control may also be called liquid pre-dispensing control.

[0065] In the pre-dispensing control, the start of automatic detergent dispensing or automatic bleach dispensing is relatively advanced compared to the standard control. Specifically, the pre-dispensing control has a fourth control that relatively advances the start of automatic detergent dispensing compared to the second control, and a fifth control that relatively advances the start of automatic bleach dispensing compared to the third control. In the example shown in Figure 8A, the control unit 12 advances the start of automatic detergent dispensing by ΔT1 relative to the start time s2 using the fourth control, and advances the start of automatic bleach dispensing by ΔT2 relative to the start time s2 using the fifth control. By advancing the detergent dispensing time T1 and the bleach dispensing time T2, a predetermined water supply time T5 can be secured after the end of the detergent dispensing time T1 and the bleach dispensing time T2.

[0066] Furthermore, as shown in Figures 8B and 8C, the control unit 12 may execute a fourth or fifth control to advance only one of the automatic dispensing of detergent or the automatic dispensing of bleach relative to the reference control.

[0067] Pre-dispensing control is performed, for example, when supplying unconcentrated detergent and a large amount of bleach to the washing tub 4. In this case, the standard amount of detergent and bleach per unit volume of water increases, and the detergent dispensing time T1 and the bleach dispensing time T2 become longer.

[0068] (Water supply control) Returning to Figure 7, as mentioned above, water supply depends on the installation environment of the washing machine 1, and there may be a difference between the expected water supply time T3 and the actual water supply time T6. For example, if the outer tub 3 is already filled with water, or if the laundry 15 has been pre-washed by hand and therefore contains a large amount of water, the actual water supply time T6 is likely to be shorter than the expected water supply time T3. Also, if the water pressure on the water supply tap is high and the water flow rate is high, the actual water supply time T6 is likely to be shorter than the expected water supply time T3. Conversely, if the water pressure on the water supply tap is low and the water flow rate is low, the actual water supply time T6 is likely to be longer than the expected water supply time T3. In addition, if there is a large amount of laundry 15, the laundry 15 will absorb water, suppressing the rise in water level, and the actual water supply time T6 is likely to be longer than the expected water supply time T3.

[0069] As shown in Figure 7, if the actual water supply time T6 is shorter than the expected water supply time T3, and the end time s6 of the actual water supply time T6 is earlier than the end of the expected water supply time T3, it becomes difficult to secure a predetermined water supply time T5. Therefore, as shown in Figure 9, the control unit 12 performs water supply control. In the example shown in Figure 9, the control unit 12 performs water supply control in addition to the fourth and fifth controls, but the control unit 12 may also perform water supply control in addition to other controls such as the first, second, and third controls.

[0070] In water supply control, the end of water supply is delayed relative to the reference control. For example, water supply control delays the end of water supply relative to the first control. The end of water supply in the first control is the end time s6 of the actual water supply time T6 (Figure 7). In this embodiment, as water supply control, additional water supply is performed after the end time s6 of the actual water supply time T6 to delay the end of water supply relative to the end time s6. The additional water supply may be intermittent or continuous. However, intermittent water supply allows for extending the water supply time while suppressing the amount of water supplied. By performing additional water supply, a predetermined water supply time T5 can be secured after the end of the detergent addition time T1 and the bleach addition time T2.

[0071] As shown in Figures 7 to 9, the liquid discharge channel 64 can be washed with water after automatic dispensing, regardless of the detergent and bleach dispensing times T1, T2 or the installation environment of the washing machine 1. Therefore, the adhesion of bleach P1 and detergent P2 can be suppressed. Furthermore, in the washing machine 1, since fabric softener also flows through the liquid discharge channel 64, suppressing the residue of detergent P2 can suppress the generation of solid matter caused by mixing the fabric softener flowing in the subsequent process with the adhered detergent.

[0072] Here, we will explain the control during the washing process in more detail. Figures 10 to 13 are flowcharts of the operation of washing machine 1.

[0073] As shown in Figure 10, the washing machine 1 starts operating (START) with the washing tub 4 containing the laundry 15. The user selects the desired washing course (S10). Specifically, the user inputs information about a washing course that includes a washing process. This information includes the liquids to be automatically dispensed during the washing process. The control unit 12 accepts the selection of liquids (detergent and bleach in the following description). If two or more liquids are accepted, the control unit 12 selects the separated liquid dispensers 63A and 63C as devices for automatically dispensing the liquids. However, if two or more liquids are accepted, the control unit 12 may not select a liquid dispenser and may instead use a predetermined combination of liquid dispensers (for example, liquid dispensers 63A and 63C) in subsequent steps.

[0074] The control unit 12 obtains the standard input amount from the input standard amount setting unit 12A and the correction setting from the input amount correction setting unit 12B. Specifically, the control unit 12 obtains the standard input amount and correction setting for detergent and bleach respectively, based on the selected washing process course.

[0075] Next, the control unit 12 determines the weight of the laundry 15 contained in the washing tub 4 (S11). Specifically, the control unit 12 obtains the weight of the laundry 15 detected by the laundry weight sensor 91. The laundry weight sensor 91 detects the weight of the laundry 15 by measuring the load torque (torque current value) of the motor of the drive unit 5. The laundry weight sensor 91 measures the current value at the start of operation of the motor and the current value after reaching a predetermined rotational speed, and compares the two values ​​to determine the amount of laundry. Also, as shown in Figures 7 to 9, the time at which the amount of laundry is determined is defined as the laundry amount determination time s1.

[0076] Next, the control unit 12 determines the amount of detergent and bleach to be added based on the weight of the laundry 15 (S12). Specifically, the control unit 12 calculates the amount of detergent and bleach to be added based on the weight of the laundry 15 and the acquired standard amount to be added. The control unit 12 may further multiply the acquired correction setting to perform a correction on the amount to be added. In addition, the control unit 12 may determine the amount of detergent and bleach to be added based on other information related to the selected course, in addition to the weight of the laundry 15.

[0077] The control unit 12 determines the detergent dispensing time T1 and the bleach dispensing time T2 based on the amounts of detergent and bleach dispensed (S13). In this embodiment, since the liquid dispensing devices 63A to 63C have positive displacement pumps, the amount of liquid dispensed per pump operation is constant. Also, the structure of the liquid dispensing devices 63A to 63C is common. Therefore, the amount of liquid dispensed per unit time Pt ​​by the liquid dispensing devices 63A to 63C is constant. The control unit 12 can calculate the detergent dispensing time T1 and the bleach dispensing time T2 by dividing the amounts of detergent and bleach dispensed by the amount of liquid dispensed per unit time Pt.

[0078] Next, the control unit 12 determines the target water level to be supplied to the outer tub 3 (S14). Specifically, the control unit 12 calculates the corresponding target water level based on the selected course and the weight of the laundry 15. The target water level may be determined by a water level rank corresponding to the weight range of the laundry 15.

[0079] Next, the control unit 12 determines the expected water supply time T3 (S15). Specifically, the control unit 12 calculates the corresponding expected water supply time T3 based on the determined target water level. The expected water supply time T3 is a guideline value for water supply time, and may be, for example, a representative value stored in the storage unit 13 in advance by the manufacturer when the washing machine 1 was manufactured. The expected water supply time T3 may also be an estimated value based on the expected water supply time T3 in past washing operations. The expected water supply time T3 may also be an estimated value based on the amount of water level change per hour (rate of water level rise) derived from, for example, the opening time of the water supply valve 10 and the change in water level detected by the water level sensor 90 during the washing operation in progress. Alternatively, the expected water supply time T3 may be a learned value that has been stored as an estimated value of the amount of water level change and learned by the control unit 12.

[0080] In this embodiment, the target water level is determined after the amount of liquid agent to be added, but the amount of liquid agent to be added may also be determined after the target water level. In that case, if the standard amount to be added is the amount of liquid agent to be added per unit volume of water, the amount of liquid agent to be added can be easily calculated.

[0081] Next, the control unit 12 starts a waiting time Tw (S16). The waiting time Tw is the time from the end of the fabric load determination to the start of water supply. The waiting time Tw is constant for all courses, including wash and rinse. By keeping the waiting time Tw constant, the user of the washing machine 1 does not feel any discomfort. If the timing of the start of water supply fluctuates each time the washing machine 1 is operated, the user may feel that there is a malfunction even though it is the same washing course as always. By starting the automatic dispensing earlier without changing the waiting time Tw, the end of water supply can be made relatively later without causing discomfort to the user. The user can also add a treatment agent to the manual dispensing unit 65 during the waiting time Tw. The treatment agent may include, for example, an auxiliary agent such as a deodorant.

[0082] Subsequently, as shown in FIG. 11, based on the detergent input time T1, the bleach input time T2, and the predicted water supply time T3, the control unit 12 executes a combination of the first control to the fifth control. In the control unit 12, as the initial setting of the control to be executed, the first control, the second control, and the third control are set. In the first control, water supply starts at the start time s2, in the second control, automatic detergent input starts at the start time s2, and in the third control, automatic bleach input starts at the start time s2.

[0083] Subsequently, the control unit 12 determines whether the time difference obtained by subtracting the detergent input time T1 from the predicted water supply time T3 is equal to or greater than a predetermined time T5 (S17).

[0084] When T3 - T1 ≥ T5 (Yes in S17), the control unit 12 maintains the setting of the second control.

[0085] When T3 - T1 < T5 (No in S17), the control unit 12 switches the second control to the fourth control that advances the start of the detergent input time T1 with respect to the start time s2 (S18).

[0086] Subsequently, the control unit 12 determines whether the time difference obtained by subtracting the bleach input time T2 from the predicted water supply time T3 is equal to or greater than a predetermined time T5 (S19, S22).

[0087] When maintaining the second control and T3 - T2 ≥ T5 (Yes in S19), the control unit 12 maintains the setting of the third control. Therefore, the control unit 12 executes the first control, the second control, and the third control (S30).

[0088] When switching to the fourth control and T3 - T2 ≥ T5 (Yes in S22), the control unit 12 maintains the setting of the third control. Therefore, the control unit 12 executes the first control, the fourth control, and the third control (S40).

[0089] While maintaining the second control, when T3 - T2 < T5 (No in S19), the control unit 12 switches the third control to the fifth control that advances the start of the bleach injection time T2 with respect to the start time s2. Therefore, the control unit 12 executes the first control, the second control, and the fifth control (S50).

[0090] When switching to the fourth control and T3 - T2 < T5 (No in S22), the control unit 12 switches from the third control to the fifth control that advances the start of the bleach injection time T2 with respect to the start time s2. Therefore, the control unit 12 executes the first control, the fourth control, and the fifth control (S60).

[0091] As described above, the control unit 12 determines whether to switch between the first control and the fifth control based on the relationship between the injection times T1, T2 and the predicted water supply time T3.

[0092] (First control, second control, third control) As shown in FIG. 12A, when executing the first control, the second control, and the third control, the control unit 12 determines whether the time s is after the start time s2 when the water supply starts (S31). The start time s2 is the time when the standby time Tw has elapsed from the cloth amount determination time s1.

[0093] When the time s is after the start time s2 (Yes in S31), the control unit 12 starts the automatic injection of the detergent, the automatic injection of the bleach, and the water supply simultaneously (S32). Specifically, the control unit 12 drives the liquid agent injection devices 63A and 63C and opens the water supply solenoid valve 66.

[0094] When the time s is before the start time s2 (No in S31), it returns to before step 31.

[0095] (First control, fourth control, third control) As shown in FIGS. 8B and 12B, when executing the first control, the fourth control, and the third control, the control unit 12 determines the start time s4 of the automatic injection of the detergent (S4).

[0096] The start time s4 is an earlier time than the second control. Specifically, the start time s4 is an earlier time than the start time s2 in order to ensure a predetermined water supply time T5 after the automatic detergent dispensing is completed. The control unit 12 determines the start time s4 based on the detergent dispensing time T1, the expected water supply time T3, and the predetermined time T5. Specifically, the control unit 12 determines the start time s4 by subtracting time ΔT1 from the start time s2. Time ΔT1 is the value obtained by subtracting the expected water supply time T3 from the sum of the detergent dispensing time T1 and the predetermined time T5.

[0097] Next, the control unit 12 determines whether the time s is after the start time s4 (S42).

[0098] If time s is after the start time s4 (Yes in S42), the control unit 12 starts the automatic dispensing of detergent (S43). Specifically, the control unit 12 drives the liquid dispensing device 63C.

[0099] If time s is earlier than the start time s4 (No in S42), return to the step before step 42.

[0100] Next, the control unit 12 determines whether the time s is after the start time s2 (S44).

[0101] If time s is after the start time s2 (Yes in S44), the control unit 12 simultaneously starts the automatic dispensing of bleach and the supply of water (S45). Specifically, the control unit 12 drives the liquid dispensing device 63A and opens the water supply solenoid valve 66.

[0102] If time s is earlier than the start time s2 (No in S44), return to the step before step 44.

[0103] (First control, second control, fifth control) As shown in Figures 8C and 12C, when the first, second, and fifth controls are executed, the control unit 12 determines the start time s5 for the automatic dispensing of bleach (S51).

[0104] The start time s5 is an earlier time than the third control. Specifically, the start time s5 is an earlier time than the start time s2 in order to ensure a predetermined water supply time T5 after the automatic dispensing of bleach is completed. The control unit 12 determines the start time s5 based on the bleach dispensing time T2, the expected water supply time T3, and the predetermined time T5. Specifically, the control unit 12 determines the start time s5 by subtracting time ΔT2 from the start time s2. Time ΔT2 is the value obtained by subtracting the expected water supply time T3 from the sum of the bleach dispensing time T2 and the predetermined time T5.

[0105] Next, the control unit 12 determines whether the time s is after the start time s5 (S52).

[0106] If time s is after the start time s5 (Yes in S52), the control unit 12 starts the automatic dispensing of bleach (S53). Specifically, the control unit 12 drives the liquid dispensing device 63A.

[0107] If time s is earlier than the start time s5 (No in S52), return to the step before step 52.

[0108] Next, the control unit 12 determines whether the time s is after the start time s2 (S54).

[0109] If time s is after the start time s2 (Yes in S54), the control unit 12 simultaneously starts the automatic dispensing of detergent and the supply of water (S55). Specifically, the control unit 12 drives the liquid dispensing device 63C and opens the water supply solenoid valve 66.

[0110] If time s is earlier than the start time s2 (No in S54), return to the step before step 54.

[0111] (First control, fourth control, fifth control) As shown in Figures 8A and 12D, when the first, fourth, and fifth controls are executed, the control unit 12 determines the start time s4 for automatic detergent dispensing and the start time s5 for automatic bleach dispensing, as described above (S61).

[0112] Next, the control unit 12 determines the first start time s7 and the second start time s8 (S62). The control unit 12 sets the earlier of the start times s4 and s5 as the first start time s7 and the later start time as the second start time s8.

[0113] Next, the control unit 12 determines whether the time s is after the first start time s7 (S63).

[0114] If time s is on or after the first start time s7 (Yes in S63), the control unit 12 starts the automatic dispensing of the liquid agent (detergent or bleach) corresponding to the first start time s7 (S64). Specifically, the control unit 12 drives one of the liquid agent dispensing devices 63A or 63C corresponding to the liquid agent.

[0115] If time s is before the first start time s7 (No in S63), return to the step before step 63.

[0116] Next, the control unit 12 determines whether the time s is after the second start time s8 (S65).

[0117] If time s is after the second start time s8 (Yes in S65), the control unit 12 starts the automatic dispensing of the liquid agent (bleach or detergent) corresponding to the second start time s8 (S66). Specifically, the control unit 12 drives one of the liquid agent dispensing devices 63A or 63C corresponding to the liquid agent.

[0118] If time s is before the second start time s8 (No in S65), return to the step before step 65.

[0119] Next, the control unit 12 determines whether the time s is after the start time s2 (S67).

[0120] If time s is after the start time s2 (Yes in S67), the control unit 12 starts supplying water (S68). Specifically, the control unit 12 opens the water supply solenoid valve 66. When the water level detected by the water level sensor 90 reaches or exceeds the target water level, the control unit 12 closes the water supply solenoid valve 66.

[0121] If time s is earlier than the start time s2 (No in S67), return to the step before step 67.

[0122] As described above, by switching between the second, third, fourth, and fifth controls, a predetermined water supply time T5 can be secured after the automatic dispensing is completed, regardless of the dispensing times T1 and T2. Furthermore, by calculating the times ΔT1 and ΔT2, the detergent dispensing time T1 and the bleach dispensing time T2 can be completed simultaneously.

[0123] (Water supply control) Here, as shown in Figure 9, the end time s3 is defined as the time when both input times T1 and T2 have ended. Since the actual water supply time T6 may be shorter than the expected water supply time T3, it is necessary to determine whether or not water supply for a predetermined time T5 has actually been performed after the end time s3. If water supply for a predetermined time T5 has not been performed after the end time s3, the control unit 12 performs water supply control. In water supply control, the end of water supply is delayed relative to the end of input times T1 and T2.

[0124] As shown in Figure 13, the control unit 12 determines whether the automatic insertion has finished. Specifically, the control unit 12 determines whether the time s is after the end time s3 (S71).

[0125] If the supply times T1 and T2 have ended (Yes in S71), the control unit 12 determines whether the actual water supply ended earlier than the end of the supply times T1 and T2. Specifically, the control unit 12 determines whether the water level detected by the water level sensor 90 has reached the target water level at the end time s3 (S72).

[0126] If input times T1 and T2 have not finished (No in S71), return to the step before step 71.

[0127] If the water level has reached the target level at the end time s3 (Yes in S72), then the actual water supply has already finished. Therefore, no actual water supply has been performed after the end time s3 of the automatic supply. In this case, the control unit 12 performs water supply control. Specifically, after the end time s3, the control unit 12 opens the water supply solenoid valve 66 to supply additional water (S73). Through this operation, a predetermined water supply for T5 can be secured after the end time s3.

[0128] Additional water supply may be performed intermittently, or with the water flow rate restricted by a throttle valve. This operation allows for a longer water supply time while suppressing an increase in the amount of water supplied.

[0129] On the other hand, if the water level has not reached the target level at the end time s3 (No in S72), then the actual water supply is continuing at the end of the supply times T1 and T2. In this case, it is required to confirm that the actual water supply continues until a predetermined time T5 is met. Therefore, the control unit 12 counts the count time T4 from the end time s3 of the supply times T1 and T2 to the end time s6 of the actual water supply (S74).

[0130] The control unit 12 determines whether the count time T4 is equal to or greater than a predetermined time T5 (S75).

[0131] If the count time T4 is equal to or greater than the predetermined time T5 (Yes in S75), then the actual water supply has not finished before the predetermined time T5 has elapsed, and water supply for the predetermined time T5 has been secured after the automatic supply has finished. The operation ends here (END).

[0132] On the other hand, if the count time T4 is less than the predetermined time T5 (No in S75), the control unit 12 performs water supply control. After the count time T4 ends, the control unit 12 opens the water supply solenoid valve 66 to supply additional water (S73). Once the additional water supply is finished, the control unit 12 closes the water supply solenoid valve 66 and terminates its operation (END).

[0133] As described above, the control unit 12 determines whether or not to perform water supply control based on the actual water supply time T6 (specifically, the count time T4 until the end time s6 of the actual water supply).

[0134] [Effect 1] The washing machine 1 according to this embodiment can achieve the following effects.

[0135] As described above, the washing machine 1 of this embodiment includes a washing tub 4 for holding laundry. The washing machine 1 further includes a tank 62C (first tank), a tank 62A (second tank), a liquid dispenser 63C (first automatic liquid dispenser), and a liquid dispenser 63A (second automatic liquid dispenser). Tank 62C contains detergent (first liquid) supplied to the washing tub 4, and tank 62A contains bleach (second liquid) supplied to the washing tub 4. Liquid dispenser 63C is connected to tank 62C and dispenses detergent, and liquid dispenser 63A is connected to tank 62A and dispenses bleach. The washing machine 1 further includes a liquid discharge channel 64 connecting liquid dispenser 63A and liquid dispenser 63C to the washing tub 4, a water supply valve 10 connected to the liquid discharge channel 64 and supplying water to the washing tub 4, and a control unit 12. The control unit 12 operates in parallel with the water supply valve 10, the automatic dispensing of detergent by the liquid dispensing device 63C (first automatic dispensing), and the automatic dispensing of bleach by the liquid dispensing device 63A (second automatic dispensing), so that the water supply ends after the automatic dispensing of detergent and bleach.

[0136] This configuration allows for the simultaneous supply of water and automatic dispensing of liquids, minimizing the time during which only the liquid is dispensed and maximizing the time during which water flows through the liquid dispensing channel 64 while the liquid is being dispensed. As a result, the liquid is easily carried by the water flow and less likely to remain in the liquid dispensing channel 64. Furthermore, by automatically dispensing detergent and bleach in parallel, the time required for automatic dispensing can be reduced compared to dispensing detergent and bleach sequentially. This allows for a smaller amount of water to be supplied. In addition, by ending the water supply after the automatic dispensing of detergent and bleach, any liquid remaining in the liquid dispensing channel 64 after automatic dispensing can be washed away by the water supply. This prevents blockage of the liquid dispensing channel 64 by the liquid. Moreover, by washing away the liquid remaining in the liquid dispensing channel 64 and supplying it to the washing tub 4, the washing performance of the washing process can be improved.

[0137] Furthermore, in the washing machine 1 of this embodiment, the control unit 12 has a reference control and a pre-dispensing control. The reference control starts water supply, automatic detergent dispensing, and automatic bleach dispensing at predetermined timings. The pre-dispensing control starts the automatic detergent dispensing or automatic bleach dispensing relatively earlier than the reference control.

[0138] With this configuration, for example, even when large amounts of detergent and bleach are added, the water supply can be terminated after the automatic dispensing of detergent and bleach.

[0139] Furthermore, in the washing machine 1 of this embodiment, the control unit 12 has, as reference controls, a first control that starts water supply at a predetermined timing, a second control that starts automatic detergent dispensing at a predetermined timing, and a third control that starts automatic bleach dispensing at a predetermined timing. The control unit 12 also has, as advance dispensing controls, a fourth control that starts automatic detergent dispensing relatively earlier than the second control, and a fifth control that starts automatic bleach dispensing relatively earlier than the third control.

[0140] This configuration allows for independent control of the liquid dispensing device 63A and the liquid dispensing device 63C. This makes it possible to start the automatic dispensing of only one of the liquids, for example, when the amount of detergent or bleach to be dispensed is large or when the automatic dispensing time is long, relatively earlier. As a result, the amount of liquid dispensed before the water supply can be reduced.

[0141] Furthermore, in the washing machine 1 of this embodiment, the control unit 12 switches from the second control to the fourth control based on the time related to the automatic dispensing of detergent. The control unit 12 switches from the third control to the fifth control based on the time related to the automatic dispensing of bleach.

[0142] This configuration allows the water supply to be completed after the automatic dispensing of detergent or bleach, even if the automatic dispensing process takes a long time.

[0143] Furthermore, in the washing machine 1 of this embodiment, the control unit 12 simultaneously terminates the automatic dispensing of detergent and bleach by the fourth control or the fifth control.

[0144] This structure allows for shortening the time intervals ΔT1 and ΔT2 that advance the start of water supply relative to the start time s2. During times ΔT1 and ΔT2, the liquid is discharged while water is not flowing through the liquid discharge channel 64, making it prone to residue and solidification. Therefore, shortening times ΔT1 and ΔT2 reduces the risk of residue and solidification of the liquid.

[0145] Furthermore, in the washing machine 1 of this embodiment, the control unit 12 has a reference control that starts water supply, automatic detergent dispensing, and automatic bleach dispensing at predetermined timings. The control unit 12 also has a water supply control that delays the end of water supply relative to the reference control.

[0146] This configuration allows for control over the timing of the water supply termination. Therefore, the water supply can be terminated after the automatic water supply has started.

[0147] Furthermore, in the washing machine 1 of this embodiment, the control unit 12 performs water supply control based on the time related to the automatic dispensing of detergent or bleach.

[0148] This configuration allows the automatic dispensing of detergent or bleach to be completed after the automatic dispensing of water, even if the dispensing process takes a long time.

[0149] Furthermore, in the washing machine 1 of this embodiment, the control unit 12 causes the water supply valve 10 to supply water intermittently.

[0150] This configuration allows for a longer water supply time while keeping the amount of water supplied to the washing tub 4 small, compared to a continuous water supply. It also minimizes the increase in water supply that is unnecessary for washing, as it is solely for the purpose of preventing residual liquid in the liquid discharge channel 64.

[0151] Furthermore, the method for controlling the washing machine 1 in this embodiment involves supplying water via the water supply valve 10, automatically dispensing detergent via the liquid dispenser 63C, and automatically dispensing bleach via the liquid dispenser 63A in parallel, so that the water supply ends after the automatic dispensing of detergent and bleach.

[0152] This configuration allows for the simultaneous supply of water and automatic dispensing of liquid, minimizing the time during which only the liquid is dispensed and ensuring a longer period during which water flows through the liquid dispensing channel 64 while the liquid is being dispensed.

[0153] [Effect 2] As described above, the washing machine 1 of this embodiment includes a washing tub 4 for holding laundry. The washing machine 1 further includes a tank 62C (first tank), a tank 62B (second tank), and a tank 62A (third tank). Tank 62C contains detergent (first liquid) to be discharged in the washing process (first process), tank 62B contains fabric softener (second liquid), and tank 62A contains bleach (third liquid) to be discharged in the washing process. The washing machine 1 further includes a liquid dispenser 63C (first automatic liquid dispenser), a liquid dispenser 63B (second automatic liquid dispenser), and a liquid dispenser 63A (third automatic liquid dispenser). Liquid dispenser 63C is connected to tank 62C and sucks up and discharges detergent in the washing process. Liquid dispenser 63B is connected to tank 62B and sucks up and discharges fabric softener. The liquid dispensing device 63A is connected to the tank 62A and sucks in and discharges bleach during the washing process. The washing machine 1 further includes a liquid discharge channel 64 that connects the liquid dispensing devices 63A, 63B, and 63C to the washing tub 4, and a water supply valve 10 connected to the liquid discharge channel 64 that supplies water to the washing tub 4. The liquid dispensing device 63B is positioned between the liquid dispensing device 63A and the liquid dispensing device 63C.

[0154] This configuration allows the liquid dispensing device 63A and the liquid dispensing device 63C to be separated from each other. Therefore, even when detergent and bleach are dispensed in the same process, mixing of the detergent and bleach can be suppressed. Consequently, direct contact between the detergent and bleach in their undiluted, undiluted state can be suppressed. This suppresses the generation of by-products due to contact between the detergent and bleach, and prevents the liquid dispensing channel 64 from being blocked by these by-products.

[0155] Furthermore, the washing machine 1 of this embodiment further includes a control unit 12. The control unit 12 performs automatic dispensing by the liquid dispenser 63B during the rinsing process (second process), which is different from the washing process.

[0156] This configuration prevents the fabric softener dispensed into the liquid dispenser 63B from mixing with the detergent.

[0157] Furthermore, the washing machine 1 of this embodiment is further equipped with a control unit 12. The control unit 12 performs the following actions in parallel during the washing process: water supply by the water supply valve 10, automatic dispensing by the liquid dispenser 63C, and automatic dispensing by the liquid dispenser 63A.

[0158] With this configuration, water supply and automatic dispensing of liquid agents are performed in parallel, so that the liquid agent is dispensed while water is flowing through the liquid agent dispensing channel 64. In other words, the liquid agent is dispensed into the water flow. Therefore, the liquid agent is easily carried by the water flow and is less likely to remain in the liquid agent dispensing channel 64. In addition, by automatically dispensing detergent and bleach in parallel, the time required for automatic dispensing can be reduced compared to dispensing detergent and bleach sequentially. Therefore, the amount of water supplied can be reduced.

[0159] Furthermore, in the washing machine 1 of this embodiment, the viscosity of the detergent is higher than that of the bleach. The liquid dispensing device 63C is connected to the liquid discharge channel 64 downstream of the liquid dispensing device 63A.

[0160] This configuration reduces the distance the detergent has to travel before it flows into case 61. As a result, detergent residue can be further suppressed.

[0161] Furthermore, in the washing machine 1 of this embodiment, tank 62B is positioned between tank 62A and tank 62C.

[0162] This configuration allows the arrangement of tanks 62A to 62C to match the arrangement of liquid dispensing devices 63A to 63C. Therefore, the structure of the automatic dispensing unit 6 can be simplified.

[0163] Furthermore, in the washing machine 1 of this embodiment, the capacity of tank 62A is smaller than the capacity of tank 62C.

[0164] This configuration allows for fewer refills of tank 62C than of tank 62A.

[0165] Furthermore, in the washing machine 1 of this embodiment, the tank 62A can also contain a fourth liquid agent of a different type than bleach.

[0166] This configuration reduces the frequency of refilling the liquid in tank 62C, thereby improving the convenience of the washing machine 1 from the user's perspective.

[0167] Furthermore, in the method for controlling the washing machine 1 of this embodiment, when the selection of two or more liquids is received during the washing process, the liquids are supplied to the washing tub 4 by the liquid dispensing device 63A and the liquid dispensing device 63C.

[0168] This configuration allows the liquid to be supplied by the separate liquid dispensing devices 63A and 63C, thereby suppressing the mixing of the liquids.

[0169] This disclosure is not limited to the embodiments described above, and can be implemented in various other forms.

[0170] In the embodiments described, an example was given in which the detergent and bleach were added in parallel, but the system is not limited to this. For example, the start and end of detergent addition may be performed before the addition and end of bleach addition. Also, the addition and end of bleach addition may be performed before the start and end of detergent addition. That is, each liquid agent may be added sequentially. In these cases as well, control is performed so that the water supply ends after the addition of the liquid agents is completed.

[0171] In this embodiment, an example was described in which the control unit 12 accelerates the start of automatic water supply in relation to the start of water supply, but the embodiment is not limited to this. For example, the control unit 12 may delay the start of water supply in relation to the start of automatic water supply.

[0172] In the embodiment, an example was described in which water supply and automatic dispensing of liquid agents are started simultaneously in the reference control, but the system is not limited to this. In the reference control, the automatic dispensing of detergent, the automatic dispensing of bleach, and water supply may be started at different predetermined timings, and a time interval may be provided between the automatic dispensing of detergent, the automatic dispensing of bleach, and water supply. As shown in Figure 14, water supply and automatic dispensing of liquid agents may be started at different times. For example, water supply may be started 3 seconds later than the start of automatic dispensing of detergent. Even in such a case, the controls shown in Figure 11 should be executed so that the expected end of water supply is after the end of automatic dispensing.

[0173] In this embodiment, an example was described in which the fourth control for detergent and the fifth control for bleach are performed independently in the pre-dispensing control, but the invention is not limited to this. As shown in Figure 15, the automatic dispensing of detergent and the automatic dispensing of bleach may be controlled together. For example, the longer of the detergent dispensing time T1 and the bleach dispensing time T2 may be used to determine the time to advance the water supply start time, and both the detergent dispensing time T1 and the bleach dispensing time T2 may be advanced. If the dispensing times T1 and T2 end at different times, the later of the two dispensing times T1 and T2 may be used as the end time s3.

[0174] In this embodiment, an example was described in which water supply during the actual water supply time T6 is performed continuously, but the embodiment is not limited to this. Water supply during the actual water supply time T6 may be performed intermittently.

[0175] In this embodiment, an example has been described in which different types of liquids are contained in tanks 62A to 62C, but the invention is not limited to this. For example, the same type of liquid may be contained in tanks 62A and 62B, or in tanks 62B and 62C, i.e., adjacent tanks. In this case, the control unit 12 performs automatic dispensing by liquid dispenser 63A and automatic dispensing by liquid dispenser 63C during the washing process. This operation can prevent the detergent and bleach from mixing. The control unit 12 may also perform automatic dispensing by liquid dispenser 63A and automatic dispensing by liquid dispenser 63C in parallel.

[0176] Furthermore, the types of liquids contained in tank 62A and tank 62C may be the same. In this case as well, by performing the automatic dispensing of the liquid from tank 62A and the automatic dispensing of the liquid from tank 62C in parallel, the time required for automatic dispensing can be shortened compared to the case where the liquids are discharged from only one tank 62A or 62C.

[0177] Although the operation of the control unit 12 in the washing process has been described in this embodiment, the invention is not limited thereto. For example, even when fabric softener is added in the rinsing process, the control unit 12 may control the start of automatic fabric softener dispensing in response to the start of water supply. On the other hand, the control according to this embodiment is more preferably used with highly viscous liquids. When using highly viscous fabric softeners, the control according to this embodiment may also be applied to the fabric softener dispensing.

[0178] Although the embodiment described the liquid dispensing channel 64 as being inclined, it is not limited to this. The liquid dispensing channel 64 may also be arranged horizontally.

[0179] In this embodiment, the washing course was described as an operating course in which two liquids are added, but the invention is not limited to this. For example, the washing machine 1 may run a scented steam course in which a fabric softener and a fragrance agent are added as an operating course. The washing machine 1 may also run a maintenance course in which multiple liquids are added, which is performed for the maintenance of clothes and the washing machine 1.

[0180] In this embodiment, an example has been described in which the storage unit 13 stores information related to the control unit 12 to be executed, but the invention is not limited to this. The information related to the control unit 12 to be executed may be stored on a server outside the washing machine 1, and the control unit 12 may download the control information from the server and execute it. Alternatively, the control unit 12 may be located on a server outside the washing machine 1.

[0181] The washing machine in the first embodiment includes a washing tub for holding laundry, a first tank for holding a first liquid supplied to the washing tub, a second tank for holding a second liquid supplied to the washing tub, a first automatic liquid dispenser connected to the first tank for discharging the first liquid, a second automatic liquid dispenser connected to the second tank for discharging the second liquid, a liquid discharge channel connecting the first and second automatic liquid dispensers to the washing tub, a water supply valve connected to the liquid discharge channel for supplying water to the washing tub, and a control unit. The control unit performs water supply by the water supply valve, first automatic dispensing by the first automatic liquid dispenser, and second automatic dispensing by the second automatic liquid dispenser in parallel, so that water supply ends after the first and second automatic dispensing.

[0182] In a second embodiment of the washing machine, the control unit has a reference control that starts water supply, first automatic dispensing, and second automatic dispensing at predetermined timings, and a pre-dispensing control that starts the first automatic dispensing or second automatic dispensing relatively earlier with respect to the reference control.

[0183] As a washing machine in a third embodiment, in the washing machine in the second embodiment, the control unit has, as reference control, a first control that starts water supply at a predetermined timing, a second control that starts the first automatic dispensing at a predetermined timing, and a third control that starts the second automatic dispensing at a predetermined timing, and as advance dispensing control, a fourth control that relatively advances the start of the first automatic dispensing relative to the second control, and a fifth control that relatively advances the start of the second automatic dispensing relative to the third control.

[0184] In the washing machine of the fourth embodiment, as in the washing machine of the third embodiment, the control unit switches from the second control to the fourth control based on the time related to the first automatic dispensing, and switches from the third control to the fifth control based on the time related to the second automatic dispensing.

[0185] In the washing machine of the fifth embodiment, as in the washing machine of the fourth embodiment, the control unit terminates the first automatic dispensing and the second automatic dispensing simultaneously by the fourth control or the fifth control.

[0186] As a washing machine in the sixth embodiment, in a washing machine in any of the first to fifth embodiments, the control unit has a reference control that starts water supply, first automatic dispensing and second automatic dispensing at predetermined timings, and a water supply control that delays the end of water supply relative to the reference control.

[0187] In the washing machine according to the seventh embodiment, as in the washing machine according to the sixth embodiment, the control unit performs water supply control based on the time for the first automatic dispensing or the second automatic dispensing.

[0188] In the eighth aspect of the washing machine, in any of the first to seventh aspects, the control unit causes the water supply valve to supply water intermittently.

[0189] A method in the ninth aspect is a method for controlling a washing machine comprising: a washing tub for containing laundry; a first tank for containing a first liquid supplied to the washing tub; a second tank for containing a second liquid supplied to the washing tub; a first automatic liquid dispenser connected to the first tank for discharging the first liquid; a second automatic liquid dispenser connected to the second tank for discharging the second liquid; a liquid discharge channel connecting the first and second automatic liquid dispensers to the washing tub; and a water supply valve connected to the liquid discharge channel for supplying water to the washing tub, wherein the water supply by the water supply valve, the first automatic dispensing by the first automatic liquid dispenser, and the second automatic dispensing by the second automatic liquid dispenser are performed in parallel, such that the water supply ends after the first and second automatic dispensing.

[0190] While this disclosure is adequately described in relation to preferred embodiments with reference to the accompanying drawings, various modifications and alterations will be obvious to those skilled in the art. Such modifications and alterations should be understood to be included within the scope of the invention as defined by the appended claims. [Industrial applicability]

[0191] The washing machine of this disclosure is useful as a household washing machine, a commercial washing machine, or any type of washer-dryer (e.g., a household drum-type washing machine) because it can improve the functionality of the configuration related to liquid dispensing. [Explanation of Symbols]

[0192] 1. Washing machine 2 cabinets 3 Outer tank 4. Washing tub 5 Drive Unit 6. Automatic feeding unit 8 Connection Channels 10 Water supply valve 11 Drain valve 12 Control Unit 13 Storage section 14 Display section 61 cases 62A~62C Tank 63A~63C Liquid dispensing device 64 Liquid Dispensing Channel 65 Manual input section 66 Water supply solenoid valve 90 Water level sensor 91 Fabric quantity sensor

Claims

1. A washing tub for holding laundry, A first tank containing the first liquid agent supplied to the washing tub, A second tank containing the second liquid agent supplied to the washing tub, A first automatic liquid dispensing device connected to the first tank and dispensing the first liquid, A second automatic liquid dispensing device connected to the second tank and dispensing the second liquid, A liquid discharge channel connecting the first automatic liquid dispensing device and the second automatic liquid dispensing device to the washing tub, A water supply valve connected to the liquid discharge channel and supplying water to the washing tub, Control unit and Equipped with, The control unit, The water supply by the water supply valve, the first automatic dispensing by the first automatic liquid dispensing device, and the second automatic dispensing by the second automatic liquid dispensing device are performed in parallel, and the water supply is performed so as to end after the first automatic dispensing and the second automatic dispensing. A washing machine having control that relatively advances the start of the first automatic water dispensing or the second automatic water dispensing, or relatively delays the end of the water supply, relative to a predetermined timing.

2. The control unit, The system includes a reference control that initiates the water supply, the first automatic dispensing, and the second automatic dispensing at predetermined timings. The washing machine according to claim 1, further comprising a pre-dispensing control that relatively advances the start of the first automatic dispensing or the second automatic dispensing with respect to the reference control.

3. The control unit, The aforementioned reference control includes a first control that starts the water supply at a predetermined timing, a second control that starts the first automatic supply at a predetermined timing, and a third control that starts the second automatic supply at a predetermined timing. The washing machine according to claim 2, comprising, as the advance dispensing control, a fourth control that relatively advances the start of the first automatic dispensing relative to the second control, and a fifth control that relatively advances the start of the second automatic dispensing relative to the third control.

4. The control unit, Based on the time for the first automatic input, the control switches from the second control to the fourth control. The washing machine according to claim 3, which switches from the third control to the fifth control based on the time related to the second automatic dispensing.

5. The washing machine according to claim 4, wherein the control unit terminates the first automatic dispensing and the second automatic dispensing simultaneously by the fourth control or the fifth control.

6. The control unit, The system includes a reference control that initiates the water supply, the first automatic dispensing, and the second automatic dispensing at predetermined timings. The washing machine according to claim 1 or 2, further comprising a water supply control that delays the termination of the water supply relative to the standard control.

7. The washing machine according to claim 6, wherein the control unit performs the water supply control based on the time for the first automatic dispensing or the second automatic dispensing.

8. The washing machine according to claim 1 or 2, wherein the control unit causes the water supply valve to supply water intermittently.

9. A method for controlling a washing machine comprising: a washing tub for holding laundry; a first tank for holding a first liquid supplied to the washing tub; a second tank for holding a second liquid supplied to the washing tub; a first automatic liquid dispenser connected to the first tank for discharging the first liquid; a second automatic liquid dispenser connected to the second tank for discharging the second liquid; a liquid discharge channel connecting the first automatic liquid dispenser and the second automatic liquid dispenser to the washing tub; and a water supply valve connected to the liquid discharge channel for supplying water to the washing tub, wherein The water supply by the water supply valve, the first automatic dispensing by the first automatic liquid dispensing device, and the second automatic dispensing by the second automatic liquid dispensing device are performed in parallel, such that the water supply ends after the first and second automatic dispensing. A method for relatively advancing the start of the first automatic supply or the second automatic supply, or relatively delaying the end of the water supply, relative to a predetermined timing.

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