WO2016202230A1

WO2016202230A1 - Washing machine

Info

Publication number: WO2016202230A1
Application number: PCT/CN2016/085656
Authority: WO
Inventors: 川口智也
Original assignee: 海尔亚洲株式会社; 青岛海尔洗衣机有限公司
Priority date: 2015-06-18
Filing date: 2016-06-14
Publication date: 2016-12-22
Also published as: JP6594673B2; KR20180017179A; US20180187357A1; JP2017006249A; EP3312331A4; CN107614779A; CN107614779B; EP3312331A1; KR102005302B1

Abstract

The object of the present invention is to provide a washing machine capable of discovering a condition in which washings in a wash tub are in a state unsuitable for a dehydration process in a stage earlier than the dehydration process. The washing machine (1) comprises: a wash tub (4) for accommodating washings (Q); an agitating component (5) arranged in the wash tub (4) in a position facing towards the washings (Q) from the bottom Z2; a motor (6) for rotating the agitating component (5); and a microcomputer (30) for controlling water supply or discharge of the wash tub (4) or controlling a voltage applied to the motor (6) for rotating the agitating component (5). During a washing process in which the agitating component (5) is rotated in the wash tub (4) filled with water, the microcomputer (30) acquires an indicator of the size of the resistance caused by the washings (Q) in the wash tub (4) to the rotation of the agitating component (5). When the resistance is less than a specified resistance in the washing process, causing the indicator to exceed a specified threshold, the microcomputer (30) determines the washings (Q) in the wash tub (4) is in the state unsuitable for the dehydration process.

Description

washing machine

Technical field

The invention relates to a washing machine.

Background technique

In the washing machine described in Patent Document 1 below, the stirring blade provided at the inner bottom of the washing and dewatering tub is rotationally driven by the motor. In the washing machine, since the water flow is generated in the washing and dewatering tub by rotating the stirring blade in a state where the water supply has been performed in the washing and dewatering tub, the laundry in the washing and dewatering tub is stirred by the water flow to be washed.

Prior art literature

Patent literature

Patent Document 1: Japanese Laid-Open Patent Publication No. 2006-68275

Problems to be solved by the invention

Although in the general washing operation performed by the washing machine, after the washing process of washing the laundry, a dehydrating process for rotating the washing and dewatering tub for dehydrating the laundry is performed, but the washing in the dewatering bucket is washed. The state will also affect the dehydration process. Specifically, when the laundry in the washing and dewatering tub is in a state of being gathered into a mass, the laundry may suddenly spread in the middle of the rotation of the washing and dewatering tub during the dehydrating process, and may be disposed in the washing and dewatering bucket in a biased manner. In this case, it is difficult to effectively dehydrate the laundry, and it is possible to generate vibration during the dehydration process.

Summary of the invention

The present invention has been made in view of the background, and an object thereof is to provide a washing machine capable of finding that a laundry in a washing tub is in a state unsuitable for a dehydration process at a stage earlier than a dehydration process.

Further, another object of the present invention is to provide a washing machine which can achieve the elimination of the state in the case where the laundry in the washing tub is in a state unsuitable for the dehydration process.

Solution to solve the problem

A washing machine according to the present invention includes: a washing tub for accommodating laundry; and a stirring member disposed in the washing tub at a position facing the laundry from below, capable of stirring the laundry in the washing tub Rotating; rotating the agitating member; performing an operation unit, performing water supply and drainage on the washing tub or controlling a voltage applied to the motor to rotate the agitating member, and performing execution in the washing tub a washing process for rotating the stirring member in a state of water and a washing operation of a dehydration process after the washing process; and a threshold setting unit that sets a predetermined threshold according to a magnitude of a load amount of the laundry in the washing tub Obtaining unit, in the washing process, obtaining an index indicating a magnitude of resistance of the laundry in the washing tub to the rotation of the stirring member; and a judging unit when, due to the washing process When the resistance is less than the predetermined resistance such that the index exceeds the predetermined threshold, determining that the laundry in the washing tub is not suitable for the dehydration process State.

Further, the present invention is characterized in that the acquisition unit calculates the index based on an inertial rotation amount of the motor after the execution unit stops applying a voltage to the motor during rotation of the stirring member.

Further, the present invention is characterized in that the acquisition unit calculates the index based on the highest rotational speed of the motor during a predetermined period of the rotation of the agitation member.

Further, the present invention is characterized in that the second acquisition unit further includes a second index indicating a magnitude of a load amount of the laundry in the washing tub, and the first index is caused by the load amount being larger than a predetermined value. When the two indicators exceed another threshold different from the predetermined threshold, the determining unit determines whether the laundry in the washing tub is in a state unsuitable for the dehydration process.

Further, the present invention is characterized in that, in the case where the judging unit judges that the laundry in the washing tub is in a state unsuitable for the dehydrating process, the execution unit performs the washing by performing the washing process The special drainage of the tub reduces the water level in the washing tub to a prescribed water level.

Further, the present invention is characterized in that the washing tub is rotatable, and the motor can rotate the washing tub, and the execution unit controls a voltage applied to the motor during the dehydrating process to cause the washing The washing tub rotates, in the case where the laundry is biased in the washing tub during the dehydrating process, The execution unit performs a correction process of rotating the agitating member in a state where the washing tub is stored to a set water level in order to correct the bias of the laundry, the washing machine further including a setting unit during the washing process In the case where the special drainage is performed, the set water level in the correction processing after the washing process is set to be lower than the case where the special drain is not performed.

Further, the present invention is characterized in that, in the washing process, when the index obtained by the acquisition unit after the special drainage exceeds the prescribed threshold, the execution unit performs the special drainage again, Then, at least one of a process of reinforcing the water flow in the washing tub and a process of extending the washing process is performed.

Effect of the invention

According to the present invention, in the washing process of the stage before the dehydration process, the execution unit controls the voltage applied to the motor to rotate the stirring member in a state where water is stored in the washing tub. Thereby, a water flow is generated in the washing tub. The laundry can be cleaned by agitating the laundry by a mechanical force generated by a rotating stirring member and a water flow to remove the laundry.

In the washing process, the acquisition unit acquires an index indicating the magnitude of the resistance of the laundry in the washing tub to the rotation of the stirring member. When the laundry in the washing tub is in a state unsuitable for the dehydration process due to agglomeration, since the contact area of the laundry with the agitating member is narrowed, the resistance is reduced to a predetermined resistance. When the resistance is equal to or less than the predetermined resistance and the index exceeds a predetermined threshold set according to the magnitude of the load of the laundry, the determination unit determines that the laundry in the washing tub is in a state unsuitable for the dehydration process.

As a result, it is found that the laundry in the washing tub is in a state unsuitable for the dehydration process at a stage earlier than the dehydration process.

Further, with the present invention, the amount of inertial rotation of the motor after the execution unit stops applying the voltage to the motor during the rotation of the agitating member increases as the resistance of the washing member to the rotation of the agitating member decreases, with the resistance Increase and decrease. Therefore, the index can be calculated based on the inertial rotation amount that changes in accordance with the increase and decrease of the resistance, so that a correct index can be obtained.

Further, according to the present invention, the maximum rotational speed of the motor during the predetermined period during the rotation of the agitating member increases as the resistance of the laundry to the rotation of the agitating member decreases, and decreases as the resistance increases. Therefore, by calculating the index based on the maximum rotational speed that changes in conjunction with the increase or decrease of the resistance, Thereby getting the right indicators.

Further, according to the present invention, in the case where the load of the laundry in the washing tub is less than the predetermined load, the laundry is less likely to be in a state unsuitable for the dehydration process. Therefore, when the load amount of the laundry is large enough to exceed the predetermined load amount and the second index exceeds the other threshold value, it can be determined whether or not the laundry is in a state unsuitable for the dehydration process.

Further, with the present invention, in the case where it is judged that the laundry in the washing tub is in a state unsuitable for the dehydration process, the water level in the washing tub is lowered to the prescribed water level by performing special drainage in the washing process. Thereby, the laundry which is in a state of being gathered in the washing tub is likely to be in contact with the stirring member due to the decrease in the water level, and thus is easily broken by the stirring member. As a result, it is possible to eliminate the state in which the laundry is not suitable for the dehydration process.

Further, with the present invention, during the dehydration process, the execution unit controls the voltage applied to the motor to rotate the washing tub. Thereby, the laundry is dehydrated by applying centrifugal force to the laundry in the washing tub.

In the case where the laundry is biased in the washing tub during the dehydration process, the execution unit performs the correction processing to rotate the stirring member in a state where the washing tub has been filled with water to the set water level. As a result, the laundry which is softened by the water is loosened by the stirring member, so that the deviation of the laundry can be corrected.

In the case where special drainage is performed during the washing process, in the dehydration process after the washing process, the laundry may be in a state in which it is not suitable for the subsequent dehydration process because it remains in a state of being aggregated. Therefore, the set water level of the correction process in this case is set to be lower than the case where the special drain is not performed. Thereby, since the laundry which is gathered in the washing tub is located on the side of the stirring member and is easily in contact with the stirring member, it is easily broken up by the stirring member. As a result, it is possible to eliminate the state in which the laundry is not suitable for the dehydration process.

Further, according to the present invention, in the case where the index obtained after the special drainage is exceeded by the predetermined threshold value, that is, in the state where the laundry is not suitable for the dehydration process, the special drainage is performed again by the special drainage. Then, since at least any one of the treatment for enhancing the flow of water in the washing tub and the treatment for prolonging the washing process is performed, the laundry which is gathered in the washing tub is easily broken up by stirring. As a result, it is possible to eliminate the state in which the laundry is not suitable for the dehydration process.

DRAWINGS

Fig. 1 is a schematic longitudinal sectional right side view of a washing machine according to an embodiment of the present invention.

Fig. 2 is a block diagram showing the electrical structure of the washing machine.

Fig. 3 is a schematic perspective view of a washing tub of the washing machine.

4 is a schematic perspective view of a washing tub.

Fig. 5 is a flow chart showing the control operation during the washing process.

Fig. 6 is a flowchart showing a related control operation of the load amount detection in the washing process.

Fig. 7 is a flowchart showing a related control operation of the inertial rotation state detection of the washing process.

Figure 8 is a flow chart showing the control action of the first embodiment in terms of the washing process.

Figure 9 is a flow chart showing the control action of the second embodiment in terms of the washing process.

Fig. 10 is a flow chart showing the related control operation of the detection of the maximum rotational speed integrated value in the washing process.

Figure 11 is a flow chart showing the control action of the third embodiment in terms of the washing process.

Figure 12 is a flow chart showing the control action of the fourth embodiment in terms of the washing process.

Fig. 13 is a flowchart showing a related control operation of the correction processing executed when the dehydration process is interrupted.

Description of the reference numerals

1: washing machine; 4: washing tub; 5: stirring part; 6: motor; 30: microcomputer; c: inertia rotation amount; d: inertia rotation amount; e: maximum rotation speed; f: maximum rotation speed; A: detection value; C: detected value; D: detected value; E: detected value; F: highest speed cumulative value; Q: washing; Z2: lower.

detailed description

Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. Fig. 1 is a schematic longitudinal sectional right side view of a washing machine 1 according to an embodiment of the present invention. The vertical direction in FIG. 1 is referred to as the vertical direction Z of the washing machine 1, and the left-right direction in FIG. 1 is referred to as the front-rear direction Y of the washing machine 1, and the direction perpendicular to the paper surface of FIG. 1 is referred to as the left-right direction X. First, The outline of the washing machine 1 will be described. In the up and down direction Z, the upper side is referred to as the upper Z1, and the lower side is referred to as the lower Z2. In the front-rear direction Y, the left side in FIG. 1 is referred to as front Y1, and the right side in FIG. 1 is referred to as rear Y2. In the left and right direction X, the paper of Figure 1 will be The side far from the observer is referred to as the left side X1, and the side closer to the viewer of the paper of FIG. 1 is referred to as the right side X2. The horizontal direction H includes a left-right direction X and a front-rear direction Y.

Although the washing machine 1 further includes a washing and drying machine having a drying function, the washing machine 1 will be described below by taking a washing machine in which only the washing operation is omitted. The washing machine 1 includes a casing 2, an outer tub, a washing tub 4, a stirring member 5, an electric motor 6, and a transmission mechanism 7.

The casing 2 is made of, for example, metal, and is formed in a box shape. The upper surface 2A of the casing 2 is formed to be inclined with respect to the horizontal direction H so as to extend toward the upper side Z1 toward the rear Y2, for example. An opening 8 that communicates with the inside and outside of the casing 2 is formed on the upper surface 2A. A door 9 that opens and closes the opening 8 is provided on the upper surface 2A. In the upper surface 2A, an operation portion 10A composed of a switch or the like and a display portion 10B composed of a liquid crystal panel or the like are provided in a region around the opening 8. Although the operation unit 10A and the display unit 10B are disposed on the front side Y1 of the opening 8 in FIG. 1 , they may be disposed on the right side X2 , for example, than the opening 8 . By operating the operation unit 10A, the user can freely select the operation condition of the washing operation or issue an instruction to the washing machine 1 to start or stop the washing operation. Information on the washing operation is visually displayed on the display unit 10B.

The outer tub 3 is made of, for example, a resin, and is formed in a bottomed cylindrical shape. The outer tub 3 includes a substantially cylindrical circumferential wall 3A disposed along an oblique direction K that is inclined toward the front Y1 with respect to the vertical direction Z, and a bottom wall 3B that blocks the hollow portion of the circumferential wall 3A from the lower side Z2; The annular annular wall 3C projects toward the center side of the circumferential wall 3A while wrapping the edge of the upper side Z1 side of the circumferential wall 3A. The inclination direction K is not only inclined with respect to the vertical direction Z but also inclined with respect to the horizontal direction H. The hollow portion of the circumferential wall 3A is exposed from the inner side of the annular wall 3C toward the upper portion Z1. The bottom wall 3B is formed in a disk shape that is orthogonal to the oblique direction K and extends obliquely with respect to the horizontal direction H, and a through hole 3D penetrating the bottom wall 3B is formed at a center position of the bottom wall 3B.

Water can be stored in the outer tub 3. For example, a box-shaped detergent storage chamber 11 is disposed above the outer tub 3 in the cabinet 2. In the detergent storage chamber 11, a water supply path 13 connected to a faucet (not shown) is connected from the upper side Z1 and the rear side Y2, and water is supplied from the water supply path 13 into the outer tub 3 through the detergent accommodating chamber 11. The water from the detergent accommodating chamber 11 may also flow down into the outer tub 3 as shown by the dotted arrow. In the middle of the water supply path 13, a water supply valve 14 that opens and closes for the purpose of starting or stopping the water supply is provided.

In the detergent accommodating chamber 11, a branch path 15 is also connected, and the branch path 15 branches from a portion of the water supply path 13 closer to the upstream side of the faucet than the water supply valve 14. Water flows into the branch from the water supply path 13 The road 15 is supplied from the branch path 15 into the outer tub 3 through the detergent accommodating chamber 11. In the middle of the branch path 15, a softener supply valve 16 that opens and closes for the purpose of starting or stopping the water supply is provided. The detergent accommodating chamber 11 is divided into a first region (not shown) for accommodating the softener and a second region (not shown) for accommodating the softener. When the softener supply valve 16 is opened, the water that has flowed into the branch path 15 from the water supply path 13 is supplied into the outer tub 3 through the first region of the detergent containing chamber 11. Thereby, the softener in the detergent storage chamber 11 is mixed into the water and supplied into the outer tub 3. On the other hand, when the water supply valve 14 is opened, the water directly flowing from the water supply path 13 is supplied into the outer tub 3 via the second region of the detergent storage chamber 11. In this case, water in a state where the softener is not mixed is supplied into the outer tub 3.

In the outer tub 3, a drain passage 18 is connected from the lower side Z2, and water in the outer tub 3 is discharged from the drain passage 18 to the outside of the machine. A drain valve 19 that opens and closes for the purpose of starting or stopping the drain is provided in the middle of the drain passage 18.

The washing tub 4 is, for example, a metal drum having a central axis 20 extending in the oblique direction K, and is formed in a bottomed cylindrical shape that is slightly smaller than the outer tub 3, and can accommodate the laundry Q therein. The washing tub 4 has a substantially cylindrical circumferential wall 4A disposed in the oblique direction K and a bottom wall 4B that blocks the hollow portion of the circumferential wall 4A from the lower side Z2.

The inner circumferential surface of the circumferential wall 4A is the inner circumferential surface of the washing tub 4. The upper end portion of the inner circumferential surface of the circumferential wall 4A is an inlet and outlet 21 that exposes the hollow portion of the circumferential wall 4A toward the upper portion Z1. The doorway 21 is in a state of being opposed to the inner region of the annular wall 3C of the outer tub 3 from the lower side Z2 and communicating with the opening 8 of the casing 2 from the lower side Z2. The user of the washing machine 1 puts the laundry Q into the washing tub 4 via the opened opening 8 and the inlet and outlet 21 .

The washing tub 4 is housed coaxially in the outer tub 3, and is disposed to be inclined with respect to the vertical direction Z and the horizontal direction H. The washing tub 4 in a state of being housed in the outer tub 3 is rotatable about the central axis 20. A plurality of through holes (not shown) are formed in the circumferential wall 4A and the bottom wall 4B of the washing tub 4, and water in the outer tub 3 can pass between the outer tub 3 and the washing tub 4 via the through holes. Therefore, the water level in the outer tub 3 coincides with the water level in the washing tub 4. Further, the water flowing out of the detergent accommodating chamber 11 passes through the inlet and outlet 21 of the washing tub 4, and is directly supplied into the washing tub 4 from the upper side Z1.

The bottom wall 4B of the washing tub 4 is formed in a disk shape extending substantially parallel to the bottom wall 3B of the outer tub 3 at intervals above the upper Z1, and a bottom portion is formed at a center position of the bottom wall 4B that coincides with the central axis 20 The through hole 4C of the wall 4B. The bottom wall 4B is provided with a tubular support shaft 22 that surrounds the through hole 4C and projects downward along the central axis 20 toward the lower Z2. The support shaft 22 is inserted through the through hole of the bottom wall 3B of the outer tub 3 3D, the lower end portion of the support shaft 22 is located below the bottom wall 3B at a position Z2.

The agitating member 5, that is, the pulsator, is formed in a disk shape centered on the central axis 20, and is disposed concentrically with the washing tub 4 along the bottom wall 4B at a lower portion in the washing tub 4. A plurality of blades 5A radially arranged are provided on the upper surface of the inlet/outlet 21 of the agitating member 5 facing the washing tub 4 from the lower side Z2. When the laundry Q is housed in the washing tub 4, it is placed on the upper surface of the stirring member 5. In other words, the stirring member 5 is disposed in the washing tub 4 at a position facing the laundry Q from the lower side Z2. The agitating member 5 is provided with a rotating shaft 23 extending from its center along the central axis 20 toward the lower side Z2. The rotating shaft 23 is inserted into the hollow portion of the support shaft 22, and the lower end portion of the rotating shaft 23 is located closer to the lower side Z2 than the bottom wall 3B of the outer tub 3.

In the present embodiment, the motor 6 is constituted by a frequency converter motor. The motor 6 is disposed in the casing 2 below the lower portion Z2 of the outer tub 3. The motor 6 has an output shaft 24 that rotates about a central axis 20. The transmission mechanism 7 is interposed between the lower end portion of each of the support shaft 22 and the rotary shaft 23 and the upper end portion of the output shaft 24. The transmission mechanism 7 selectively transmits the driving force output from the output shaft 24 of the motor 6 to one or both of the support shaft 22 and the rotation shaft 23. The transfer mechanism 7 can use a well-known transfer mechanism.

When the driving force from the motor 6 is transmitted to the support shaft 22 and the rotating shaft 23, the washing tub 4 and the stirring member 5 are rotated about the central axis 20. The rotation direction of the washing tub 4 and the stirring member 5 coincides with the circumferential direction S of the washing tub 4.

FIG. 2 is a block diagram showing an electrical configuration of the washing machine 1. Referring to Fig. 2, the washing machine 1 includes an execution unit, a threshold setting unit, an acquisition unit, a determination unit, a second acquisition unit, and a microcomputer 30 as a setting unit. The microcomputer 30 includes, for example, a CPU, a memory unit such as a ROM, a RAM, and the like, and is disposed in the casing 2 (see FIG. 1).

The washing machine 1 further includes a water level sensor 31, a rotation sensor 32, and a buzzer 33. The water level sensor 31, the rotation sensor 32, and the buzzer 33, and the operation unit 10A and the display unit 10B are electrically connected to the microcomputer 30, respectively. The motor 6, the transmission mechanism 7, the water supply valve 14, the softener supply valve 16, and the drain valve 19 are electrically connected to the microcomputer 30 via, for example, a drive circuit 34.

The water level sensor 31 is a sensor that detects the water level of the outer tub 3 and the washing tub 4, and the detection result of the water level sensor 31 is input to the microcomputer 30 in real time.

The rotation sensor 32 is a device that reads the rotation speed of the motor 6, and strictly reads the rotation speed of the output shaft 24 of the motor 6, for example, a plurality of output pulses when the output shaft 24 rotates at a predetermined rotation angle. It is composed of a punched Hall IC (not shown). The rotational speed read by the rotation sensor 32 is input to the microcomputer 30 in real time. The microcomputer 30 controls the voltage applied to the motor 6 in accordance with the input rotational speed, and in detail controls the duty ratio of the voltage applied to the motor 6, so that the rotation of the motor 6 is controlled in such a manner that the motor 6 rotates at a desired rotational speed. In the present embodiment, for convenience of explanation, the rotational speed of the motor 6 is the same as the rotational speed of each of the washing tub 4 and the stirring member 5.

Further, the microcomputer 30 can also control the direction of rotation of the motor 6. Therefore, the motor 6 can be rotated forward or reversed. In the present embodiment, the rotation direction of the output shaft 24 of the motor 6 coincides with the rotation direction of each of the washing tub 4 and the stirring member 5. For example, when the motor 6 is rotating forward, the washing tub 4 and the stirring member 5 are viewed from the upper side Z1 to rotate clockwise in a plan view, and when the motor 6 is reversed, the washing tub 4 and the stirring member 5 are reversed counterclockwise in a plan view. Rotate.

As described above, when the user operates the operation unit 10A to select the operation condition or the like of the washing operation, the microcomputer 30 accepts the selection. The microcomputer 30 displays the necessary information to the user in a visual manner via the display unit 10B. The microcomputer 30 notifies the user of the start and end of the washing operation by issuing a predetermined sound by the buzzer 33.

The microcomputer 30 controls the transmission mechanism 7 to switch the transmission target of the driving force of the motor 6 to one or both of the support shaft 22 and the rotation shaft 23. In the case where the transmission target of the driving force of the motor 6 is the support shaft 22, the microcomputer 30 controls the voltage applied to the motor 6 to rotate or stop the washing tub 4. In the case where the transmission target of the driving force of the motor 6 is the rotating shaft 23, the microcomputer 30 controls the voltage applied to the motor 6 to rotate or stop the stirring member 5.

The microcomputer 30 controls opening and closing of the water supply valve 14, the softener supply valve 16, and the drain valve 19. Therefore, the microcomputer 30 can supply water to the washing tub 4 by opening the water supply valve 14, and can supply the softener to the washing tub 4 by opening the softener supply valve 16, and the draining of the washing tub 4 can be performed by opening the drain valve 19. The microcomputer 30 can store water in the washing tub 4 by opening the water supply valve 14 in a state where the drain valve 19 is closed.

Next, the washing operation performed by the microcomputer 30 in the washing machine 1 will be described. The washing operation includes a washing process of washing the laundry Q, a rinsing process of rinsing the laundry Q after the washing process, and a dehydrating process of dehydrating the laundry Q at the end of the washing operation. It should be noted that in the washing operation, only tap water may be used, or bath water may be used as needed.

As will be described later in detail, during the washing process, the microcomputer 30 rotates the stirring member 5 in a state where the washing tub 4 has been filled with water to a predetermined water level. At this time, the washing tub 4 is in a stationary state. The laundry Q in the washing tub 4 is stirred by contact with the blade 5A of the rotating stirring member 5 or by the flow of water generated in the washing tub 4 along the rotating stirring member 5. In this manner, the laundry Q is agitated by the mechanical force generated by the rotating stirring member 5 and the water flow to remove the laundry Q, so that the laundry Q can be cleaned. Further, the laundry Q in the washing tub 4 is decomposed by passing the detergent in the washing tub 4 into the laundry. The laundry Q in the washing tub 4 is also cleaned by this.

In the rinsing process after the washing process, the microcomputer 30 rotates the stirring member 5 in a state where the washing tub 4 is re-stored with water. Thereby, the laundry Q in the washing tub 4 is rinsed by the blade 5A of the rotating stirring member 5 in a state of being immersed in water. It is also possible to rotate the washing tub 4 together with the stirring member 5 during the rinsing process.

In the dehydration process, the microcomputer 30 rotates the washing tub 4 in a state where the drain valve 19 is opened. At this time, the stirring member 5 may be rotated together with the washing tub 4. In the dehydration process, the microcomputer 30 accelerates the rotation speed of the motor 6 from 0 rpm to the first rotation speed of 120 rpm in a state where the drain valve 19 is opened, and then rotates the motor 6 at a constant speed of 120 rpm. The first rotation speed is higher than the rotation speed at which the washing tub 4 resonates laterally (for example, 50 rpm to 60 rpm), and is lower than the rotation speed at which the washing tub 4 resonates longitudinally (for example, 200 rpm to 220 rpm).

After the constant speed rotation at 120 rpm, the microcomputer 30 accelerates the rotation speed of the motor 6 from 120 rpm to the second rotation speed of 240 rpm, and then rotates the motor 6 at a constant speed of 240 rpm. The second rotational speed is slightly higher than the rotational speed at which longitudinal resonance occurs. Then, the microcomputer 30 accelerates the rotation speed of the motor 6 from 240 rpm to the maximum rotation speed of 800 rpm, and then causes the motor 6 to rotate at the highest speed at a constant speed. Thereby, since the washing tub 4 is rotated at a high speed, the laundry Q is dehydrated by the centrifugal force acting on the laundry Q in the washing tub 4. The water oozing from the laundry Q by dehydration is discharged from the outside of the machine through the drain path 18 of the outer tub 3. The dehydration process ends and the washing operation is completed.

3 and 4 are schematic perspective views of the washing tub 4. In FIGS. 3 and 4, for convenience of explanation, the washing tub 4 is shown by a broken line, the stirring member 5 is shown by a dotted line, and the laundry Q is shown by a solid line. The laundry Q in the washing tub 4 has a state suitable for the dehydration process and a state unsuitable for the dehydration process. As shown in Fig. 3, the substantially cylindrical laundry Q along the circumferential wall 4A of the washing tub 4 is in a state suitable for the dehydration process. In this case, to make the substantially cylindrical laundry Q and the circumferential wall 4A The gap 40 is in a state in which the entire region of the circumferential direction S and the entire region of the oblique direction K become smaller, and the laundry Q is in a state of being evenly distributed in the washing tub 4. When the dehydration process is started when the laundry Q is in such a state, since the washing tub 4 can be smoothly accelerated to the maximum rotational speed in a state where vibration does not occur, the centrifugal force effectively acts on the laundry Q, so that the dehydration process can be efficiently performed.

On the other hand, the agglomerated laundry Q as shown in Fig. 4 is in a state unsuitable for the dehydration process. In detail, a large gap 41 is generated between the portion on both sides of the laundry Q in the oblique direction K and the circumferential wall 4A. When the dehydration process is started when the laundry Q is in such a state, in the middle of the acceleration of the washing tub 4, for example, when rotating at a medium speed of between 120 rpm and 240 rpm, the laundry Q in a state of being aggregated may sometimes be unpredictable. The direction of arrival suddenly spreads and is biased into the washing tub 4. Since the washing tub 4 in a state in which the laundry Q is placed in a biased manner cannot be stably rotated, it is difficult for the centrifugal force to effectively act on the laundry Q to perform dehydration, and there is a possibility that large vibration is generated in the middle.

In the initial stage of the washing operation, that is, the washing process, the laundry Q tends to gather in a group due to various factors. Therefore, the washing machine 1 is configured to find that the laundry Q in the washing tub 4 is in a state unsuitable for the dehydration process and to eliminate the state during the washing process.

Fig. 5 is a flow chart showing the control operation during the washing process. Referring to Fig. 5, the microcomputer 30 detects the load amount of the laundry Q in the washing tub 4 as the washing process starts (step S1).

Fig. 6 is a flowchart showing a related control operation of the load amount detection. Referring to Fig. 6, the microcomputer 30 applies a voltage to the motor 6 at the start of the load amount detection, and rotationally drives the stirring member 5 in the forward direction at a low speed for a predetermined time, and then stops applying a voltage to the motor 6, thereby stopping the driving of the motor 6. (Step S101). Then, since the agitating member 5 and the motor 6 rotate by inertia, the microcomputer 30 measures the inertial rotation amount of the motor 6 in step S101. The inertia rotation amount is, for example, the total number of pulses output by the Hall IC (not shown) of the rotation sensor 32 during the inertia rotation of the motor 6. The amount of inertial rotation here is the inertial rotation amount of the motor 6 and the inertial rotation amount of the stirring member 5. The inertial rotation amount in the case where the motor 6 is rotated in the forward inertia at the time of the load amount detection as in step S101 is referred to as "inertia rotation amount a".

Next, the microcomputer 30 stops the driving of the motor 6 by driving the stirring member 5 in the reverse direction at a low speed for a predetermined period of time, and measures the inertial rotation amount of the motor 6 at this time (step S102). The inertial rotation amount in the case where the motor 6 is rotated in the reverse inertia at the time of the load amount detection as in step S102 is referred to as "inertia rotation amount b".

Then, the microcomputer 30 uses the value obtained by adding up the inertia rotation amount a measured in step S101 and the inertia rotation amount b measured in step S102 as the detection value A (step S103). The larger the load amount of the laundry Q, the smaller the inertial rotation amount of the stirring member 5 on which the heavy laundry Q is placed and the inertial rotation amount of the motor 6 connected to the stirring member 5, so the detection value A is also smaller. . The smaller the load amount of the laundry Q, the larger the inertial rotation amount of the stirring member 5 on which the light laundry Q is placed and the inertial rotation amount of the motor 6, so that the detection value A becomes large. In other words, the detected value A is an example of an index indicating the magnitude of the load amount. It should be noted that the order of steps S101 and S102 may be reversed, and the inertia rotation amounts a and b may be measured a plurality of times, and the values obtained by adding all of the inertia rotation amounts a and b may be used as the detection value A.

Referring back to FIG. 5, in step S1, the microcomputer 30 that has obtained the detected value A sets the specification based on the magnitude of the detected value A, in other words, the amount of load of the laundry Q in the washing tub 4. Threshold. The predetermined threshold value herein refers to a second threshold value, a third threshold value, a fourth threshold value, a fifth threshold value, a sixth threshold value, and a seventh threshold value which will be described later, and is determined in advance according to the magnitude of the load amount, and is stored in the memory of the microcomputer 30. unit. After the step S1, the microcomputer 30 supplies water to the predetermined water level in the washing tub 4 (step S2), and starts the rotation of the stirring member 5 (step S3). The rotating stirring member 5 is strictly reversed in such a manner that the forward rotation and the reverse rotation are alternately repeated. Thereby, the laundry Q is cleaned as described above.

In the cleaning process of the laundry Q, the microcomputer 30 executes the process of detecting the inertial rotation state several times, for example, three times (steps S4 to S6). Fig. 7 is a flowchart showing a related control operation of the inertial rotation state detection. Referring to Fig. 7, the microcomputer 30 first drives the motor 6 after the stirring member 5 is rotationally driven in the forward direction for a predetermined period of time in the state where the washing tub 4 has been stored in the predetermined water level with the start of the inertial rotation state detection. The measurement is stopped, and the inertial rotation amount of the motor 6 at this time is measured (step S201). It should be noted that the predetermined time here is the same as the time during which the stirring member 5 for washing the laundry Q is rotated forward. In other words, as a loop of the forward rotation of the stirring member 5 for washing, the inertial rotation state detection is performed. The inertial rotation amount in the case where the motor 6 is rotated in the forward inertia when the inertia rotation state is detected as in step S201 is referred to as "inertia rotation amount c".

Next, in a state where the washing tub 4 has been subsequently stored in the predetermined water level, the microcomputer 30 stops the driving of the motor 6 by rotating the stirring member 5 only in the reverse direction for a predetermined period of time, and measures the inertial rotation of the motor 6 at this time. A quantity (step S202). It should be noted that the specified time and stirring part here 5 The same time is reversed for washing the laundry Q. In other words, the inertial rotation state detection is performed as a loop of the reversal of the agitation member 5 for washing. The inertial rotation amount in the case where the motor 6 is rotated in the reverse inertia when the inertia rotation state is detected as in step S202 is referred to as "inertia rotation amount d". It should be noted that the order of step S201 and step S202 may also be reversed.

Then, the microcomputer 30 repeats the processing of steps S201 and S202 a plurality of times, for example, 16 times (step S203: YES), and accumulates the value obtained by summing the inertial rotation amount c and the inertia rotation amount d 16 times. The detected value of the inertial rotation state detection is taken (step S204). Since the resistance of the laundry Q in the washing tub 4 to the rotation of the stirring member 5 (hereinafter simply omitted as "resistance") is smaller, the amount of inertial rotation is larger, and thus the detected value is also larger. On the other hand, since the amount of inertia rotation is smaller as the resistance is larger, the detected value is also smaller. In this way, the detected value is an index indicating the magnitude of the resistance, in other words, an index indicating the rotation state of the stirring member 5, and the microcomputer 30 stops the application of the voltage to the motor 6 in accordance with the rotation of the stirring member 5. The detected value is calculated by the inertia rotation amount of 6.

Referring back to FIG. 5, the microcomputer 30 acquires the detected value B in the first inertial rotation state detection in step S4, and acquires the detected value C in the second inertial rotation state detection in step S5, and the third in step S6. The detected value D is obtained in the sub-inertial rotation state detection. When the laundry Q in the washing tub 4 is in a state unsuitable for the dehydration process due to the aggregation (see FIG. 4), the resistance is reduced to less than the predetermined resistance by narrowing the contact area of the laundry Q with the agitating member 5. The stirring member 5 is smoothly rotated. Therefore, the detected value of the inertial rotation state detection increases in accordance with the order of the detected value B, the detected value C, and the detected value D as time passes.

Therefore, when the amount of load is so large that the detected value A is smaller than the first threshold value, the microcomputer 30 determines whether the resistance is as small as the predetermined resistance or less until the detected value B is smaller than the second threshold. The total value of the detected value C and the detected value D exceeds the third threshold (step S7). The first threshold, the second threshold, and the third threshold are respectively different prescribed thresholds. For example, in the case where the first threshold is 200, the second threshold is 2000 and the third threshold is 5000.

In the washing process, when the detected value A exceeds the first threshold due to the load amount being larger than the predetermined load amount, when the total value of the detected value C and the detected value D exceeds the third threshold due to the resistance being less than the predetermined resistance (Step S7: YES), the microcomputer 30 judges that the laundry Q in the washing tub 4 is gathered into a mass and is in a state unsuitable for the dehydration process (step S8). The result is that it can be earlier than the dehydration process The washing process of the stage finds that the laundry Q in the washing tub 4 is in a state unsuitable for the dehydration process.

In particular, the amount of inertial rotation described above increases as the resistance decreases, and decreases as the resistance increases. Therefore, in the inertial rotation state detection, by calculating the detected values B to D based on the inertial rotation amount that changes in accordance with the increase or decrease of the resistance as described above, the detected values B to D can be obtained as applied to the step S7. The correct indicator of judgment. Further, the above-described load amount detection differs between the measurement of the inertia rotation amounts a and b before the water supply and the detection of the inertia rotation state c and d after the water supply is detected. In consideration of the inertial rotation amount c, d of the inertial rotation state detection performed in a state where all the laundry is uniformly wetted in consideration of the fact that the dry laundry and the wet laundry are mixed together in the case of the load amount detection A value that can be trusted in the judgment in step S7.

Further, when the load amount of the laundry Q in the washing tub 4 is smaller than the predetermined load amount so that the detected value A is lower than the first threshold value, the laundry Q hardly becomes a spherical state which is not suitable for the dehydration process. Therefore, in step S7, when the load amount of the laundry Q is larger than the predetermined load amount, and the second index called the detection value A exceeds the first threshold value, it can be determined whether or not the laundry Q is not present. Suitable for the state of the dehydration process.

When the microcomputer 30 judges that the laundry Q in the washing tub 4 is gathered into a state and is in a state unsuitable for the dehydration process, the stirring member 5 is stopped and the special drainage is performed (step S8). As a special drain, the microcomputer 30 lowers the water level in the washing tub 4 to a predetermined water level by discharging a part of the water in the washing tub 4 out of the machine. After the special draining, the microcomputer 30 restarts the rotation of the stirring member 5, and continues the washing of the laundry Q (step S9). As a result, the laundry Q in a state of being aggregated in the washing tub 4 is lowered by the buoyancy as the water level is lowered, so that it becomes easy to come into contact with the stirring member 5, and thus it is easy to be rotated by the stirring member 5 that is rotated. Break up. As a result, it is possible to eliminate the state in which the laundry Q is not suitable for the dehydration process. As long as the laundry Q becomes in a state suitable for the dehydration process, the washing operation can be smoothly moved to the dehydration process.

Regarding the treatment after the step S9 in the washing process, the following first to fourth examples can be exemplified. In the case of the first embodiment shown in Fig. 8, the microcomputer 30 continues the operation by continuing the rotation of the stirring member 5 from the start of the washing process until the end time of a predetermined time, for example, 10 minutes (step S10). It is to be noted that when the total value of the detected value B and the detected value C is equal to or less than the third threshold value due to the almost no decrease in the resistance (step S7: NO), the laundry Q is in a state already suitable for the dehydration process. Therefore, the microcomputer 30 does not perform the processing of step S8 and step S9, but The stirring member 5 is rotated by the subsequent step S3 to continue the operation (step S10). Then, when the end time is reached, the microcomputer 30 ends the washing process. It is to be noted that, in the case where the washing process is 10 minutes, for example, the processing from steps S1 to S7 is performed in about 5 minutes in the first half, and the processing from steps S8 to S10 is performed in about 5 minutes in the second half.

Fig. 9 is a flow chart showing the control operation of the second embodiment. In the respective drawings in FIG. 9 and FIG. 9 and below, the same step numbers are given to the same processing steps as those in FIGS. 5 to 8 , and detailed description of the processing steps will be omitted. In the case of the second embodiment shown in FIG. 9, the microcomputer 30 re-executes the inertial rotation state detection in the state where the rotation of the agitation member 5 is restarted in step S9, and performs the highest rotation speed cumulative value detection (step S11). ). The microcomputer 30 acquires the detected value E in accordance with the flow illustrated in Fig. 7 in the inertial rotation state detection.

Fig. 10 is a flowchart showing a related control operation of the detection of the maximum rotational speed integrated value. With reference to Fig. 10, the microcomputer 30 measures the highest value of the motor 6 when the stirring member 5 is rotationally driven only in the forward direction for a predetermined time in a state where the washing tub 4 has been stored in the predetermined water level with the start of the detection of the highest rotational speed integrated value. The number of revolutions (step S301). It should be noted that the predetermined time here is the same as the time during which the stirring member 5 is rotated forward to wash the laundry Q. In other words, as a loop of the forward rotation of the agitating member 5 for washing, the highest rotational speed integrated value detection is performed. The highest rotation speed in the case where the motor 6 is rotated in the forward direction when the maximum rotation speed integrated value is detected as in step S301 is referred to as "maximum rotation speed e".

Next, the microcomputer 30 measures the maximum number of rotations of the motor 6 when the agitating member 5 is rotationally driven only in the reverse direction for a predetermined period of time in a state where the washing tub 4 has been subsequently stored in the predetermined water level (step S302). It should be noted that the predetermined time here is the same as the time during which the stirring member 5 is reversed to wash the laundry Q. In other words, the highest rotational speed integrated value detection is performed as a loop of the agitation of the agitation member 5 for cleaning. The highest rotation speed in the case where the motor 6 is rotated in the reverse direction when the maximum rotation speed integrated value is detected as in step S302 is referred to as "maximum rotation speed f". It should be noted that the order of step S301 and step S302 may also be reversed.

Then, when the microcomputer 30 repeats the processing of steps S301 and S302 a plurality of times, for example, 16 times (step S303: YES), the value obtained by accumulating the total value of the highest rotation speed e and the maximum rotation speed f 16 times is taken as The highest speed cumulative value F (step S304). As the resistance is smaller, the maximum rotational speeds e and f are larger, and thus the maximum rotational speed integrated value F is also larger. On the other hand, the larger the resistance, the smaller the maximum rotational speeds e, f, and therefore the smaller the maximum rotational speed integrated value F. Thus, the maximum speed cumulative value F is indicative of resistance As an example of the index of the size, the microcomputer 30 calculates the highest rotational speed integrated value F based on the maximum rotational speed of the motor 6 in the predetermined period during the rotation of the agitating member 5.

Returning to Fig. 9, the microcomputer 30 acquires the detected value E by the inertial rotation state detection in step S11, and acquires the highest rotational speed integrated value F by the highest rotational speed integrated value detection.

Therefore, whether or not the microcomputer 30 performs the first special drainage (step S8), it is confirmed whether the resistance is so small that the detected value E exceeds the fourth threshold or the maximum rotational speed integrated value F exceeds the fifth threshold (step S12). . The fourth threshold and the fifth threshold are different predetermined thresholds, respectively, and are predetermined thresholds that are different from the first threshold, the second threshold, and the third threshold. For example, in the case where the first threshold is 200 as described above, the fourth threshold is 18000 and the fifth threshold is 1200.

After the first special drainage (step S8), when the detected value E exceeds the fourth threshold or the maximum rotational speed integrated value F exceeds the fifth threshold because the resistance is less than the prescribed resistance (step S12: YES), the microcomputer 30 judges the washing tub The laundry Q in 4 is in a state of not being broken up and is not suitable for the subsequent dehydration process. As a result, it is found that the laundry Q in the washing tub 4 is in a state unsuitable for the dehydration process in the washing process at a stage earlier than the dehydration process. In particular, the maximum rotational speed of the motor 6 described above increases as the resistance decreases, and decreases as the resistance increases. Therefore, the highest rotational speed integrated value F is obtained as the correct index applicable to the determination in step S12 by calculating the highest rotational speed integrated value F based on the highest rotational speed that changes in association with the increase or decrease of the resistance.

When the microcomputer 30 determines that the laundry Q is in a state in which it is not suitable for the subsequent dehydration process, the stirring member 5 is stopped, and the second special drain is performed to lower the water level in the washing tub 4 (step S13). Among them, in the second special drainage, the water level in the washing tub 4 is lowered to a prescribed water level lower than in the case of the first special drainage. After the second special drainage, the microcomputer 30 restarts the rotation of the stirring member 5, and continues the washing of the laundry Q (step S14). At this time, the microcomputer 30 extends the respective rotation times of the forward and reverse directions of the agitating member 5, for example, from 1.8 seconds to 2.1 seconds, thereby continuing the washing in a state where the water flow in the washing tub 4 is reinforced. Cleaning of Q (step S14).

Then, the microcomputer 30 continues to operate until the end time (step S10). It is to be noted that when the total value of the detected value C and the detected value D exceeds the third threshold because the resistance hardly decreases (step S7: NO), the microcomputer 30 does not perform step S8, step S9, and step S11 to In the process of S14, the stirring member 5 is rotated by the subsequent step S3 to continue the operation (step S10). Then, when the end time is reached, the microcomputer 30 ends the washing process.

In the case of the third embodiment shown in FIG. 11, the microcomputer 30 re-executes the inertial rotation state detection in the state where the rotation of the agitation member 5 is restarted in step S9, acquires the detection value E, and executes the highest rotation speed cumulative value. The detection is performed to obtain the highest rotational speed integrated value F (step S11). When the detected value E exceeds the fourth threshold or the maximum rotational speed integrated value F exceeds the fifth threshold (step S12: YES), the microcomputer 30 stops the stirring member 5, and performs the second special drainage (step S13).

Then, after the second special drainage, the microcomputer 30 restarts the rotation of the stirring member 5, and continues the washing of the laundry (step S15). At this time, unlike the step S14 of the second embodiment, the microcomputer 30 extends the washing process by setting the extension of the end time of the washing process (step S15). The extension time in the case of the 10-minute washing process as described above is, for example, 2 minutes.

Then, the microcomputer 30 continues to operate until the extended end time (step S10). It is to be noted that when the total value of the detected value C and the detected value D exceeds the third threshold because the resistance hardly decreases (step S7: No), the microcomputer 30 does not perform step S8, step S9, step S11 to In the processing of S13 and step S15, the stirring member 5 is rotated by the subsequent step S3, and the operation is continued until the normal end time before the extension (step S10). Then, when the end time is reached, the microcomputer 30 ends the washing process.

In the case of the fourth embodiment shown in FIG. 12, the microcomputer 30 re-executes the inertial rotation state detection in the state where the rotation of the agitation member 5 is restarted in step S9, acquires the detection value E, and executes the highest rotation speed cumulative value. The detection is performed to obtain the highest rotational speed integrated value F (step S11). When the detected value E exceeds the fourth threshold or the maximum rotational speed integrated value F exceeds the fifth threshold (step S12: YES), the microcomputer 30 stops the stirring member 5, and performs the second special drainage (step S13).

Then, after the second special drainage, the microcomputer 30 restarts the rotation of the stirring member 5, and continues the washing of the laundry (step S16). At this time, the microcomputer 30 sets the extension of the end time of the washing process as in step S15 of the third embodiment, and continues in a state where the water flow in the washing tub 4 is reinforced as in step S14 of the second embodiment. Washing of the laundry (step S16).

Then, the microcomputer 30 continues to operate until the extended end time (step S10). It is to be noted that when the total value of the detected value C and the detected value D exceeds the third threshold because the resistance hardly decreases (step S7: No), the microcomputer 30 does not perform step S8, step S9, step S11 to S13 And the process of step S16, but the step S3 continues to rotate the stirring member 5. Thereby, the microcomputer 30 continues the operation until the normal end time before the extension in a state where the water flow in the washing tub 4 is maintained in the normal state (step S10). Then, when the end time is reached, the microcomputer 30 ends the washing process.

In the second to fourth embodiments, in a state where the laundry Q is not suitable for the dehydration process, the first special drainage is not eliminated, and the microcomputer 30 performs the special drainage again in step S13, in step S14 to In S16, at least one of the process of reinforcing the flow of water in the washing tub 4 and the process of extending the washing process is performed at least. Therefore, since the laundry Q in a state in which the washing tub 4 is gathered in a state is accompanied by the lowering of the water level under the second special drainage of the step S13, it is easier to contact the stirring member 5 than the first special drainage, and thus it is easy. The stirring member 5 is restarted by restarting the rotation. In addition, the laundry Q is also easily broken up by the strong water flow in the washing tub 4. Further, since the above mechanical force sufficiently acts on the laundry Q accompanying the extension of the washing process, the laundry Q is easily broken up. As a result of the above, it is possible to eliminate the state in which the laundry Q is not suitable for the dehydration process.

In the dehydration process after the washing process, the microcomputer 30, in the state in which the drain valve 19 is opened, causes the motor to be driven in three stages of a first rotation speed of 120 rpm, a second rotation speed of 240 rpm, and a third rotation speed of 800 rpm as described above. The rotational speed of 6 is accelerated to rotate the washing tub 4. At this time, when the laundry Q is placed in a state of being biased in the washing tub 4, the phenomenon that the duty ratio of the voltage applied to the motor 6 is hard to be reduced or the rotation speed of the motor 6 is hard to rise. When these phenomena occur in the dehydration process, the microcomputer 30 judges that there is a bias of the laundry Q in the washing tub 4, that is, an imbalance. In the case where the bias of the laundry Q is large to a predetermined size or larger, the microcomputer 30 interrupts the dehydration process and performs the correction processing shown in FIG. 13 to correct the bias of the laundry Q.

Specifically, first, the microcomputer 30 confirms (step S21) whether or not special drainage has been performed in this washing operation (step S8). The execution history of the special drain is stored in a memory unit (not shown) of the microcomputer 30.

When the special drain is not performed in this washing operation (step S21: NO), the microcomputer 30 supplies water to the washing tub 4 to store the water to a predetermined normal set water level (step S22). The microcomputer 30 rotates the stirring member 5 for a predetermined time in a state where the washing tub 4 has stored water to the set water level (step S23). Thereby, the laundry Q which is softened by the water soaking is softened by the stirring member 5, so that the deviation of the laundry Q can be corrected. When passing the prescribed time here, the microcomputer 30 The drain valve 19 is opened, and the drain of the washing tub 4 is performed (step S24). Thereby, the correction process ends. After the correction process, the dehydration process is restarted.

On the other hand, in the case where special drainage is performed in the washing process of this washing operation (step S21: Yes), in the dehydration process after the washing process, the laundry Q may be kept in a state of being gathered. Biased and in a state that is not suitable for the dehydration process. Therefore, the set water level of the microcomputer 30 storing the water in the washing tub 4 in the correction processing after the washing process is set to be lower than the normal case in which the special drain is not performed (step S25). Then, the microcomputer 30 supplies water to the washing tub 4, stores water to a set water level set lower than usual (step S22), and then rotates the stirring member 5 for a predetermined time (step S23). As a result, the laundry Q accumulated in the washing tub 4 is weakened by buoyancy, and is easily lowered toward the stirring member 5 during the correction process, and is in contact with the stirring member 5, so that it is easily broken by the stirring member 5. As a result, it is possible to eliminate the state in which the laundry Q is not suitable for the dehydration process. When the predetermined time has elapsed, the microcomputer 30 performs drainage of the washing tub 4 (step S24), and ends the correction processing.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the claims.

For example, in the above-described step S7 (refer to FIG. 5), only one of the detected value C and the detected value D may be used without using the total value of the detected value C and the detected value D. Specifically, in step S7, when the amount of load is so large that the detected value A is smaller than the first threshold, the microcomputer 30 confirms whether the resistance is small regardless of whether the resistance is large or not until the detected value B is smaller than the second threshold. It is the extent that the detected value C or D is higher than the prescribed sixth threshold. Further, when the detected value A exceeds the first threshold value due to the load amount being larger than the predetermined load amount, and the detected value C or D exceeds the sixth threshold value because the resistance is smaller than the predetermined resistance (step S7: YES), the microcomputer 30 judges The laundry Q in the washing tub 4 is in a state of being gathered into a mass and not suitable for the dehydration process.

Further, in step S7, it is also possible to determine based on the total value of the detected value C, the detected value D, the detected value C, and the detected value D, and based on the highest rotational speed integrated value F. Specifically, in step S7, when the amount of load is so large that the detected value A is smaller than the first threshold, the microcomputer 30 confirms whether the resistance is small regardless of whether the resistance is large or not until the detected value B is smaller than the second threshold. The degree to which the maximum speed cumulative value F is higher than the predetermined seventh threshold is reached. Further, when the detected value A exceeds the first threshold value due to the load amount being larger than the predetermined load amount, and the resistance is less than the predetermined resistance so that the highest speed cumulative value F exceeds the seventh threshold value (step S7: YES), the microcomputer 30 judges Washing in the washing tub 4 The polyester Q is in a state of being gathered into a mass and not suitable for the dehydration process.

Further, in the above-described embodiment, the rotation of the agitation member 5 is stopped during the period in which the special drainage is performed in steps S8 and S13, but the rotation of the agitation member 5 may not be stopped, and the rotation may be continued to the end time.

Further, in the above-described embodiment, the load amount detection, the inertia rotation state detection, and the maximum rotation speed integrated value detection are executed based on the inertial rotation state and the maximum rotation speed of the motor 6 measured by the rotation sensor 32. Alternatively, a dedicated sensor for measuring the rotation state of the stirring member 5 may be separately provided, and the load amount detection, the inertia rotation state detection, and the maximum rotation speed accumulation may be performed based on the inertial rotation state and the maximum rotation speed of the stirring member 5 measured by the sensor. Value detection.

Further, although the final dehydration process performed at the end of the washing operation has been described with respect to the dehydration process of the above embodiment, the dehydration process can also be performed as an intermediate dehydration process immediately after the washing process, and during the intermediate dehydration process. The correction processing shown in Fig. 13 can be performed.

Further, in the washing machine 1, the center axis 20 of the outer tub 3 and the washing tub 4 is disposed to extend in the oblique direction K (see FIG. 1), but may be disposed to extend in the vertical direction Z.

Claims

A washing machine, comprising:

Washing the tub to contain the laundry;

a stirring member disposed in the washing tub at a position facing the laundry from below, and capable of rotating the laundry in the washing tub;

a motor that rotates the stirring member;

An execution unit that performs water supply and drainage to the washing tub or controls a voltage applied to the motor to rotate the stirring member, and performs washing including rotating the stirring member in a state where the washing tub is filled with water a washing operation of the process and the dehydration process after the washing process;

a threshold setting unit that sets a predetermined threshold according to a magnitude of a load amount of the laundry in the washing tub;

Obtaining means, in the washing process, obtaining an index indicating a magnitude of resistance of the laundry in the washing tub to the rotation of the stirring member;

The judging unit judges that the laundry in the washing tub is in a state unsuitable for the dehydration process when the index exceeds the predetermined threshold due to the resistance being less than a predetermined resistance during the washing process.
A washing machine according to claim 1, wherein

The acquisition unit calculates the index according to an inertial rotation amount of the motor after the execution unit stops applying a voltage to the motor during rotation of the agitation member.
The washing machine according to claim 1 or 2, wherein the acquisition unit calculates the index based on a maximum number of rotations of the motor during a predetermined period of rotation of the stirring member.
A washing machine according to any one of claims 1 to 3, characterized in that

Further including a second acquisition unit that acquires a second indicator indicating the magnitude of the load of the laundry in the washing tub,

The second indicator exceeds the specification because the load amount is greater than or equal to a predetermined value In the case of another threshold of the threshold, the determination unit determines whether the laundry in the washing tub is in a state unsuitable for the dehydration process.
A washing machine according to any one of claims 1 to 4, characterized in that

In a case where the judging unit judges that the laundry in the washing tub is in a state unsuitable for the dehydrating process, the execution unit causes the washing unit to perform the special draining of the washing tub during the washing process. The water level in the washing tub drops to the specified water level.
A washing machine according to claim 5, wherein

The washing tub is rotatable, and the motor can rotate the washing tub, and the execution unit controls a voltage applied to the motor to rotate the washing tub during the dehydrating process,

In the case where the laundry is biased by the laundry during the dehydration process, the execution unit performs the agitation in a state where the washing tub is stored to the set water level in order to correct the bias of the laundry. Correction of part rotation,

Further including a setting unit that sets the set water level in the correction process after the washing process to be smaller than the special drain in the case where the special drain is performed in the washing process The situation is low.
A washing machine according to claim 5 or 6, wherein

In the washing process, when the index obtained by the acquisition unit after the special drainage exceeds the prescribed threshold, the execution unit performs the special drainage again, and then, the reinforcing the washing tub is performed At least one of treatment of the internal water flow and treatment of extending the washing process.