JP2017006249A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine capable of finding the fact that laundry in a washing tub is in a state of not suitable for a dewatering step at an earlier stage than the dewatering step.SOLUTION: A washing machine 1 includes: a washing tub 4 for accommodating laundry Q; an agitation member 5 arranged in a position for facing the laundry Q from a lower side Z2 in the washing tub 4; a motor 6 for rotating the agitation member 5; and a microcomputer 30 for supplying/draining water to/from the washing tub 4 and for rotating the agitation member 5 by controlling a voltage to be applied to the motor 6. The microcomputer 30 acquires an index showing the size of resistance which the laundry Q in the washing tub 4 imparts to the rotation of the agitation member 5, in a washing step of rotating the agitation member 5 in a state where water is stored in the washing tub 4. In the washing step, when the index exceeds a predetermined threshold value as the resistance is below a predetermined value, the microcomputer 30 determines that the laundry Q in the washing tub 4 is in a state of not suitable for a dewatering step.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a washing machine.

  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 a motor. In this washing machine, a water flow is generated in the washing / dehydrating tub by rotating the stirring blade while water is supplied into the washing / dehydrating tub. Therefore, the laundry in the washing / dehydrating tub is washed by being stirred by this water flow. Is done.

JP 2006-68275 A

  In a typical washing operation with a washing machine, after the washing process of washing the laundry, a dehydration process is performed in which the washing and dewatering tub is rotated to dehydrate the laundry. This may affect the dehydration process. Specifically, when the laundry in the laundry dewatering tub is in a rounded state, the laundry is suddenly scattered in the middle of the rotation of the laundry / dehydration tub in the dehydration process, and is unevenly arranged in the laundry / dehydration tub. May be. This makes it difficult to effectively dehydrate the laundry, and vibration may occur during the dehydration process.

The present invention has been made under such background, and it is intended to provide a washing machine capable of finding that the laundry in the washing tub is not suitable for the dehydration process at an earlier stage than the dehydration process. Objective.
Another object of the present invention is to provide a washing machine capable of eliminating this state when the laundry in the washing tub is not suitable for the dehydration process.

  The present invention includes a laundry tub that accommodates laundry, a stirring member that is disposed in a position facing the laundry from below in the laundry tub, and is rotatable to stir the laundry in the laundry tub, and the stirring A motor for rotating the member, and an execution means for supplying and draining water to the washing tub, and for rotating the stirring member by controlling a voltage applied to the motor, in a state where water is stored in the washing tub. Execution means for executing a washing operation including a washing step of rotating the stirring member and a dehydration step after the washing step, and a predetermined threshold value is set according to the load amount of the laundry in the washing tub Threshold setting means for obtaining, an obtaining means for obtaining an index indicating a magnitude of resistance that the laundry in the washing tub gives to rotation of the stirring member in the washing step, and in the washing step, the resistance is less than a predetermined value. To be Ri when the indicator passes the predetermined threshold value, characterized in that it comprises a and a determining means for determining that there is a state in which the laundry of the washing tub is not suitable for the dehydration step, a washing machine.

  Further, according to the present invention, the acquisition unit calculates the index from an inertial rotation amount of the motor after the execution unit stops applying a voltage to the motor while the stirring member is rotating. .

  Further, the present invention is characterized in that the acquisition means calculates the index from the maximum number of rotations of the motor within a predetermined period while the stirring member is rotating.

  The present invention further includes second acquisition means for acquiring a second index indicating a load amount of the laundry in the washing tub, and the second index is increased when the load amount is larger than a predetermined value. When the threshold value is different from the predetermined threshold value, the determination means determines whether the laundry in the washing tub is in a state not suitable for the dehydration step.

  Further, in the present invention, when the determination unit determines that the laundry in the washing tub is not suitable for the dehydration step, the execution unit executes special drainage of the washing tub in the washing step. By doing so, the water level in the washing tub is lowered to a predetermined water level.

  In the present invention, the washing tub is rotatable, the motor can rotate the washing tub, and the execution means controls a voltage applied to the motor in the dehydration step. When the laundry tub is rotated, and there is a laundry bias in the laundry tub in the dehydration step, the execution means is configured to water the laundry tub to a set water level in order to correct the laundry bias. When the special drainage is executed in the washing step, the set water level in the correction processing after the washing step is set to the special drainage. It further includes setting means for setting a value lower than that in the case where is not executed.

  In the washing step, when the index acquired by the acquisition unit after the special drainage exceeds the predetermined threshold, the execution unit performs the special drainage again, and then It is characterized in that at least one of a process for strengthening the water flow in the washing tub and a process for extending the washing step is executed.

According to the present invention, in this washing machine, in the washing step before the dehydration step, the execution means controls the voltage applied to the motor and rotates the stirring member while water is stored in the washing tub. . Thereby, a water flow is generated in the washing tub. Since the mechanical force of the rotating stirring member and water flow stirs the laundry, dirt is removed from the laundry, so that the laundry can be washed.
In the washing step, the acquisition means acquires an index indicating the magnitude of resistance that the laundry in the washing tub gives to the rotation of the stirring member. When the laundry in the washing tub is rounded and becomes unsuitable for the dehydration process, the contact area between the laundry and the stirring member becomes narrow, and thus the resistance decreases to less than a predetermined value. Due to the resistance being less than the predetermined value, when the index exceeds a predetermined threshold value set according to the load amount of the laundry, the determination means indicates that the laundry in the washing tub is not suitable for the dehydration process. It is determined that
As a result, it can be found at an earlier stage than the dehydration process that the laundry in the washing tub is not suitable for the dehydration process.

  In addition, according to the present invention, the inertial rotation amount of the motor after the execution means stops applying the voltage to the motor during the rotation of the stirring member increases according to the decrease in the resistance of the laundry to the rotation of the stirring member. Becomes smaller as the resistance increases. Therefore, an accurate index can be acquired by calculating the index from the inertial rotation amount that changes in conjunction with the increase / decrease in resistance.

  Further, according to the present invention, the maximum number of rotations of the motor within a predetermined period during the rotation of the stirring member increases as the resistance that the laundry gives to the rotation of the stirring member increases, and decreases as the resistance increases. Become. Therefore, an accurate index can be obtained by calculating the index from the maximum rotational speed that changes in conjunction with the increase or decrease in resistance.

  Moreover, according to this invention, when the load amount of the laundry in a washing tub is less than predetermined, a laundry does not become a state unsuitable for a dehydration process. Therefore, it is possible to determine whether or not the laundry is in a state not suitable for the dehydration process in the appropriate case where the load amount of the laundry is greater than a predetermined value and the second index exceeds another threshold.

  Further, according to the present invention, when it is determined that the laundry in the washing tub is not suitable for the dehydration process, the water level in the washing tub is set to the predetermined water level by executing the special drainage in the washing process. Go down. Thereby, since the laundry in the state which was curled in the washing tub becomes easy to contact a stirring member by falling with the fall of a water level, it becomes easy to collapse by a stirring member. As a result, it is possible to eliminate the state where the laundry is not suitable for the dehydration process.

According to the present invention, in the dehydration step, the execution means controls the voltage applied to the motor to rotate the washing tub. Thereby, the laundry is dehydrated by the centrifugal force acting on the laundry in the washing tub.
When there is a bias in the laundry in the washing tub, the executing means rotates the stirring member in a state where water is accumulated in the washing tub to the set water level by executing the correction process. Thereby, since the laundry which became soft by being immersed in water is destroyed by the stirring member, the bias of the laundry can be corrected.
When special drainage is performed in the washing process, the dehydration process after the washing process may remain unsuitable for the dehydration process because the laundry remains in a spherical shape. Therefore, the set water level in the correction process in this case is set lower than when special drainage is not executed. Thereby, since the laundry curled in the washing tub is located on the stirring member side and easily comes into contact with the stirring member, the laundry is easily broken by the stirring member. As a result, it is possible to eliminate the state where the laundry is not suitable for the dehydration process.

  Further, according to the present invention, when the index acquired after the special drainage exceeds a predetermined threshold value, that is, when the state where the laundry is not suitable for the dehydration process is not eliminated by the special drainage, the special drainage is performed. Is executed again. Thereafter, at least one of the process of strengthening the water flow in the washing tub and the process of extending the washing process is executed, and the laundry that is curled in the washing tub is easily broken by the stirring member. As a result, it is possible to eliminate the state where the laundry is not suitable for the dehydration process.

FIG. 1 is a schematic vertical sectional right side view of a washing machine according to an embodiment of the present invention. FIG. 2 is a block diagram showing an electrical configuration of the washing machine. FIG. 3 is a schematic perspective view of a washing tub of the washing machine. FIG. 4 is a schematic perspective view of the washing tub. FIG. 5 is a flowchart showing a control operation in the washing process. FIG. 6 is a flowchart showing a control operation relating to load amount detection in the washing process. FIG. 7 is a flowchart showing a control operation related to the inertia rotation state detection in the washing process. FIG. 8 is a flowchart showing a control operation according to the first embodiment regarding the washing process. FIG. 9 is a flowchart showing a control operation according to the second embodiment regarding the washing process. FIG. 10 is a flowchart showing a control operation related to detection of the maximum rotational speed integrated value in the washing process. FIG. 11 is a flowchart showing a control operation according to the third embodiment regarding the washing process. FIG. 12 is a flowchart showing a control operation according to the fourth embodiment regarding the washing process. FIG. 13 is a flowchart showing a control operation related to the correction process executed when the dehydration process is interrupted.

  Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic vertical sectional right side view of a washing machine 1 according to an embodiment of the present invention. The up-down direction in FIG. 1 is referred to as the up-down direction Z of the washing machine 1, 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. An outline of the washing machine 1 will be described. In the vertical direction Z, the upper part is referred to as an upper part Z1, and the lower part is referred to as a lower part Z2. In the front-rear direction Y, the left side in FIG. 1 is referred to as a front Y1, and the right side in FIG. 1 is referred to as a rear Y2. In the left-right direction X, the back side of the paper surface of FIG. 1 is referred to as a left side X1, and the near side of the paper surface of FIG. 1 is referred to as a right side X2. The left-right direction X and the front-rear direction Y are included in the horizontal direction H.

  The washing machine 1 includes a washing machine having a drying function. Hereinafter, the washing machine 1 will be described by taking a washing machine in which the drying function is omitted and only a washing operation is performed as an example. The washing machine 1 includes a housing 2, an outer tub 3, a washing tub 4, a stirring member 5, an electric motor 6, and a transmission mechanism 7.

  The housing | casing 2 is metal, for example, and is formed in a box shape. The upper surface 2A of the housing 2 is formed to be inclined with respect to the horizontal direction H so as to extend upward Z1 toward the rear Y2, for example. An opening 8 that allows communication between the inside and outside of the housing 2 is formed in the upper surface 2A. A door 9 for opening and closing the opening 8 is provided on the upper surface 2A. In the area around the opening 8 on the upper surface 2A, an operation unit 10A configured with a switch or the like and a display unit 10B configured with a liquid crystal panel or the like are provided. The operation unit 10 </ b> A and the display unit 10 </ b> B are arranged at the front Y <b> 1 from the opening 8 in FIG. 1, but may be arranged at the right side X <b> 2 from the opening 8, for example. By operating the operation unit 10A, the user can freely select the operating conditions of the washing operation or can instruct the washing machine 1 to start or stop the washing operation. Information on the washing operation is displayed on the display unit 10B so as to be visible.

  The outer tub 3 is made of, for example, resin and is formed in a bottomed cylindrical shape. The outer tub 3 includes a substantially cylindrical circumferential wall 3A disposed along an inclination direction K that is inclined forward Y1 with respect to the vertical direction Z, a bottom wall 3B that blocks a hollow portion of the circumferential wall 3A from below Z2, A ring-shaped annular wall 3C projecting toward the circle center side of the circumferential wall 3A while framing the upper Z1 side edge of the circumferential wall 3A. The inclination direction K is inclined not only in the vertical direction Z but also in the horizontal direction H. A hollow portion of the circumferential wall 3A is exposed to the upper side Z1 from the inside of the annular wall 3C. The bottom wall 3B is formed in a disc shape that is orthogonal to the inclination direction K and extends in an inclined manner with respect to the horizontal direction H, and a through hole 3D that penetrates the bottom wall 3B is formed at a circular center position of the bottom wall 3B. Is done.

  Water is stored in the outer tub 3. For example, a box-shaped detergent storage chamber 11 is disposed above the outer tub 3 in the housing 2. A water supply channel 13 connected to a faucet (not shown) is connected to the detergent storage chamber 11 from above Z1 and rear Y2, and water is supplied from the water supply channel 13 through the detergent storage chamber 11 into the outer tub 3. The The water from the detergent storage chamber 11 may be supplied into the outer tub 3 after flowing down in the form of a shower as indicated by broken line arrows. In the middle of the water supply path 13, a water supply valve 14 that is opened and closed to start and stop water supply is provided.

  The detergent storage chamber 11 is also connected to a branch path 15 that branches from an upstream portion of the water supply path 13 closer to the faucet than the water supply valve 14. Water flows from the water supply channel 13 into the branch channel 15 and is supplied from the branch channel 15 into the outer tub 3 through the detergent storage chamber 11. In the middle of the branch path 15, a softener supply valve 16 that is opened and closed to start and stop water supply is provided. In the detergent storage chamber 11, a first region (not shown) in which the softening agent is stored and a second region (not shown) in which the softening agent is not stored are partitioned. When the softener supply valve 16 is opened, the water flowing into the branch path 15 from the water supply path 13 is supplied into the outer tub 3 after passing through the first region of the detergent storage chamber 11. Thereby, the softening agent in the detergent storage chamber 11 is supplied into the outer tub 3 on the water. On the other hand, when the water supply valve 14 is opened, the water that has flowed directly from the water supply path 13 is supplied into the outer tub 3 after passing through the second region of the detergent storage chamber 11. In this case, water that is not mixed with the softening agent is supplied into the outer tub 3.

  A drainage channel 18 is connected to the outer tub 3 from below Z2, and water in the outer tub 3 is discharged from the drainage channel 18 to the outside of the machine. In the middle of the drainage channel 18, a drainage valve 19 that is opened and closed to start and stop drainage is provided.

  The washing tub 4 is, for example, a metal drum, has a central axis 20 extending in the inclined direction K, is formed in a bottomed cylindrical shape that is slightly smaller than the outer tub 3, and accommodates the laundry Q therein. Can do. The washing tub 4 has a substantially cylindrical circumferential wall 4A arranged along the inclination direction K, and a bottom wall 4B that closes a hollow portion of the circumferential wall 4A from below Z2.

  An inner peripheral surface of the circumferential wall 4 </ b> A is an inner peripheral surface of the washing tub 4. The upper end portion of the inner peripheral surface of the circumferential wall 4A is an entrance / exit 21 that exposes the hollow portion of the circumferential wall 4A to the upper side Z1. The entrance / exit 21 faces the inner region of the annular wall 3 </ b> C of the outer tub 3 from the lower side Z <b> 2 and is in communication with the opening 8 of the housing 2 from the lower side Z <b> 2. A user of the washing machine 1 puts the laundry Q into and out of the washing tub 4 through the opened opening 8 and the entrance 21.

  The washing tub 4 is accommodated coaxially in the outer tub 3 and is disposed obliquely with respect to the vertical direction Z and the horizontal direction H. The washing tub 4 in the state accommodated in the outer tub 3 can rotate around 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 passes between the outer tub 3 and the washing tub 4 through the through holes. it can. Therefore, the water level in the outer tub 3 matches the water level in the washing tub 4. Further, the water flowing out from the detergent storage chamber 11 passes through the entrance / exit 21 of the washing tub 4 and is directly supplied into the washing tub 4 from above 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 with an interval in the upper direction Z1, and the circular center position coincides with the central axis 20 on the bottom wall 4B. A through-hole 4C that penetrates the bottom wall 4B is formed. The bottom wall 4B is provided with a tubular support shaft 22 that extends downward Z2 along the central axis 20 while surrounding the through-hole 4C. The support shaft 22 is inserted into the through-hole 3D of the bottom wall 3B of the outer tub 3, and the lower end portion of the support shaft 22 is located below the bottom wall 3B from the bottom wall 3B.

  The agitating member 5 is a so-called pulsator, is formed in a disk shape with the central axis 20 as the center of the circle, and is arranged concentrically with the washing tub 4 along the bottom wall 4B in the lower part in the washing tub 4. In the stirring member 5, a plurality of blades 5 </ b> A arranged radially are provided on the upper surface of the washing tub 4 facing the entrance / exit 21 from the lower side Z <b> 2. When the laundry Q is accommodated in the washing tub 4, it is placed on the upper surface of the stirring member 5. That is, the stirring member 5 is disposed in the laundry tub 4 at a position facing the laundry Q from below Z2. The stirring member 5 is provided with a rotating shaft 23 extending from the center of the circle to the lower Z2 along the central axis 20. The rotation shaft 23 is inserted through the hollow portion of the support shaft 22, and the lower end portion of the rotation shaft 23 is located below the bottom wall 3 </ b> B of the outer tub 3 in the Z <b> 2.

  In the present embodiment, the motor 6 is configured by an inverter motor. The motor 6 is disposed in the lower part Z <b> 2 of the outer tub 3 in the housing 2. 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 portions 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 by the motor 6 to one or both of the support shaft 22 and the rotation shaft 23. A known transmission mechanism 7 is used.

  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 rotate around the central axis 20. The rotation directions of the washing tub 4 and the stirring member 5 coincide 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 a microcomputer 30 as an execution unit, a threshold setting unit, an acquisition unit, a determination unit, a second acquisition unit, and a setting unit. The microcomputer 30 includes, for example, a CPU and a memory unit such as a ROM and a RAM, and is arranged in the housing 2 (see FIG. 1).

  The washing machine 1 further includes a water level sensor 31, a rotation sensor 32, and a buzzer 33. Each of the water level sensor 31, the rotation sensor 32, the buzzer 33, and the operation unit 10A and the display unit 10B described above is electrically connected to the microcomputer 30. Each of the motor 6, the transmission mechanism 7, the water supply valve 14, the softener supply valve 16, and the drain valve 19 is electrically connected to the microcomputer 30 through, 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 number of rotations of the motor 6, strictly speaking, the number of rotations of the output shaft 24 in the motor 6. For example, the rotation sensor 32 is a hall that outputs a pulse each time the output shaft 24 rotates by a predetermined rotation angle. It is composed of an IC (not shown). The rotation number read by the rotation sensor 32 is input to the microcomputer 30 in real time. The microcomputer 30 controls the duty ratio of the voltage applied to the motor 6, specifically the voltage applied to the motor 6, based on the input rotational speed so that the motor 6 rotates at a desired rotational speed. The rotation of the motor 6 is controlled. In this embodiment, for convenience of explanation, the number of rotations of the motor 6 is the same as the number of rotations of the washing tub 4 and the stirring member 5.

  The microcomputer 30 can also control the direction of rotation of the motor 6. Therefore, the motor 6 can rotate forward or reversely. In this embodiment, the rotation direction of the output shaft 24 of the motor 6 matches the rotation direction of the washing tub 4 and the stirring member 5. For example, when the motor 6 rotates in the forward direction, the washing tub 4 and the stirring member 5 rotate in the forward direction clockwise when viewed from above Z1, and when the motor 6 rotates in the reverse direction, the washing tub 4 and the stirring member 5 Rotates counterclockwise in plan view.

  As described above, when the user operates the operation unit 10A and selects the operation condition of the washing operation, the microcomputer 30 receives the selection. The microcomputer 30 displays necessary information on the display unit 10B so as to be visible to the user. The microcomputer 30 notifies the user of the start and end of the washing operation by generating a predetermined sound with the buzzer 33.

  The microcomputer 30 switches the transmission destination of the driving force of the motor 6 to one or both of the support shaft 22 and the rotation shaft 23 by controlling the transmission mechanism 7. When the transmission destination 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. When the transmission destination 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, supply a softening agent to the washing tub 4 by opening the softening agent supply valve 16, and open the drain valve 19 to wash the washing tub 4. Can be drained. The microcomputer 30 can store water in the washing tub 4 by opening the water supply valve 14 with the drain valve 19 closed.

  Next, a washing operation performed by the microcomputer 30 in the washing machine 1 will be described. The washing operation includes a washing step for washing the laundry Q, a rinsing step for rinsing the laundry Q after the washing step, and a dehydration step for dehydrating the laundry Q at the end of the washing operation. In the washing operation, only tap water may be used, or bath water may be used as necessary.

  As will be described in detail later, in the washing step, the microcomputer 30 rotates the stirring member 5 in a state where water is stored in the washing tub 4 to a specified 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 touching the blades 5A of the rotating stirring member 5 or riding on the water flow generated in the washing tub 4 by the rotating stirring member 5. Since the dirt is removed from the laundry Q when the rotating stirring member 5 and the mechanical force by the water flow stir the laundry Q, the laundry Q can be washed. Further, the laundry Q in the washing tub 4 is decomposed by the detergent put into the washing tub 4. Also by this, the laundry Q in the washing tub 4 is washed.

  In the rinsing step after the washing step, the microcomputer 30 rotates the stirring member 5 in a state where water is newly accumulated in the washing tub 4. Thereby, the laundry Q in the washing tub 4 is rinsed by being stirred by the blades 5 </ b> A of the rotating stirring member 5 while being immersed in water. During the rinsing process, the washing tub 4 may be rotated together with the stirring member 5.

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

  After the steady rotation at 120 rpm, the microcomputer 30 accelerates the rotation speed of the motor 6 from 120 rpm to a second rotation speed of 240 rpm, and then rotates the motor 6 at a medium speed of 240 rpm. The second rotational speed is slightly higher than the rotational speed at which longitudinal resonance occurs. Thereafter, the microcomputer 30 accelerates the rotational speed of the motor 6 from 240 rpm to the maximum rotational speed of 800 rpm, and then rotates the motor 6 at the maximum rotational speed. Thereby, since the washing tub 4 rotates at high speed, the laundry Q is dehydrated by the centrifugal force acting on the laundry Q in the washing tub 4. The water oozed out from the laundry Q by dehydration is discharged out of the machine from the drainage channel 18 of the outer tub 3. By completing the dehydration process, the washing operation is completed.

  3 and 4 are schematic perspective views of the washing tub 4. 3 and 4, for convenience of explanation, the washing tub 4 is illustrated by a dotted line, the stirring member 5 is illustrated by a one-dot chain line, and the laundry Q is illustrated by a solid line. The laundry Q in the washing tub 4 has a state suitable for the dehydration process and a state not suitable 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, the laundry Q is evenly distributed in the washing tub 4 so that the gap 40 between the substantially cylindrical laundry Q and the circumferential wall 4A is reduced over the entire region in the circumferential direction S and the entire region in the inclined direction K. It is in a distributed state. If the dehydration process is started when the laundry Q is in such a state, the washing tub 4 can smoothly accelerate up to the maximum number of rotations without causing vibration, and the laundry Q is effectively subjected to centrifugal force. Therefore, the dehydration process can be performed efficiently.

  On the other hand, as shown in FIG. 4, the laundry Q rounded into a spherical shape is not suitable for the dehydration process. Specifically, a relatively large gap 41 is generated between the portions on both sides of the laundry Q in the inclination direction K and the circumferential wall 4A. When the dehydration process is started when the laundry Q is in such a state, the laundry Q in a state of being rounded into a spherical shape during acceleration of the washing tub 4, for example, at a medium speed rotation between 120 rpm and 240 rpm. May be suddenly scattered in an unexpected direction, and may be biased in the washing tub 4. Since the washing tub 4 in the state where the laundry Q is arranged in an uneven manner cannot be rotated stably, it is difficult to effectively apply centrifugal force to the laundry Q for dehydration, and a large vibration occurs in the middle. May occur.

  The laundry Q tends to be rounded into a spherical shape due to various factors in the washing process, which is the initial stage of the washing operation. Therefore, the washing machine 1 is configured to find out in the washing process that the laundry Q in the washing tub 4 is not suitable for the dehydration process and to eliminate this condition.

  FIG. 5 is a flowchart showing a control operation in the washing process. Referring to FIG. 5, the microcomputer 30 detects the load amount of the laundry Q in the washing tub 4 in accordance with the start of the washing process (step S1).

  FIG. 6 is a flowchart showing a control operation related to load amount detection. Referring to FIG. 6, the microcomputer 30 applies a voltage to the motor 6 and starts the rotation of the stirring member 5 in the forward direction at a low speed for a predetermined time with the start of load amount detection, and then the voltage of the motor 6 is detected. The application is stopped and the driving of the motor 6 is stopped (step S101). Then, since the stirring 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 inertial rotation amount is, for example, the total number of pulses output from the Hall IC (not shown) of the rotation sensor 32 while the motor 6 is inertially rotated. The inertia rotation amount here is the inertia rotation amount of the motor 6 and also the inertia rotation amount of the stirring member 5. The inertial rotation amount when the motor 6 is inertially rotated in the positive direction at the time of load amount detection as in step S101 is referred to as “inertia rotation amount a”.

  Next, the microcomputer 30 stops the drive of the motor 6 after rotating the stirring member 5 in the reverse direction at a low speed for a predetermined time, and measures the inertial rotation amount of the motor 6 at this time (step S102). The inertial rotation amount when the motor 6 inertially rotates in the reverse direction at the time of load amount detection as in step S102 is referred to as “inertia rotation amount b”.

  The microcomputer 30 sets a value obtained by adding the inertia rotation amount a measured in step S101 and the inertia rotation amount b measured in step S102 as a detection value A (step S103). As the load amount of the laundry Q is larger, both 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 become smaller. Get smaller. The smaller the load amount of the laundry Q, the greater 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 the detected value A increases. That is, the detection value A is an example of an index indicating the magnitude of the load amount. Note that the order of step S101 and step S102 may be reversed, or the inertial rotation amounts a and b are measured a plurality of times, and the sum of these inertial rotation amounts a and b is used as the detection value A. Good.

  Returning to FIG. 5, the microcomputer 30 that has acquired the detection value A in this way, in step S <b> 1, according to the size of the acquired detection value A, that is, the load amount of the laundry Q in the washing tub 4. A predetermined threshold is set. Here, the predetermined threshold values are 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 are predetermined according to the magnitude of the load amount, It is stored in the memory unit of the microcomputer 30. After step S1, the microcomputer 30 supplies water to the specified water level in the washing tub 4 (step S2), and starts the rotation of the stirring member 5 (step S3). Strictly speaking, the rotating stirring member 5 is inverted so that forward rotation and reverse rotation are alternately repeated. As a result, the laundry Q is washed as described above.

  During the washing of the laundry Q, the microcomputer 30 executes a process called inertial rotation state detection a plurality of times, for example, three times (steps S4 to S6). FIG. 7 is a flowchart showing a control operation related to inertial rotation state detection. Referring to FIG. 7, the microcomputer 30 first drives the stirring member 5 to rotate in the forward direction for a predetermined time in a state where water has accumulated in the washing tub 4 to the specified water level with the start of the inertia rotation state detection. Later, the driving of the motor 6 is stopped, and the inertial rotation amount of the motor 6 at this time is measured (step S201). Note that the predetermined time here is the same as the time during which the stirring member 5 rotates forward for washing the laundry Q. That is, inertial rotation state detection is performed as part of the forward rotation of the stirring member 5 for cleaning. The inertia rotation amount when the motor 6 is inertially rotated in the positive direction at the time of inertial rotation state detection as in step S201 is referred to as “inertia rotation amount c”.

  Next, the microcomputer 30 stops the drive of the motor 6 after rotating the stirring member 5 in the reverse direction for a predetermined time in a state where water is continuously accumulated in the washing tub 4 to the specified water level. The inertial rotation amount is measured (step S202). The predetermined time here is the same as the time for the stirring member 5 to reversely rotate for washing the laundry Q. That is, inertial rotation state detection is performed as part of the reverse rotation of the stirring member 5 for cleaning. The inertial rotation amount when the motor 6 inertially rotates in the reverse direction at the time of inertial rotation state detection as in step S202 is referred to as “inertia rotation amount d”. Note that the order of step S201 and step S202 may be reversed.

  When the microcomputer 30 repeats the processes of steps S201 and S202 a plurality of times, for example, 16 times (YES in step S203), the microcomputer 30 obtains the total of the inertia rotation amount c and the inertia rotation amount d by integrating 16 times. The obtained value is set as a detection value in inertial rotation state detection (step S204). The smaller the resistance that the laundry Q in the washing tub 4 gives to the rotation of the stirring member 5 (hereinafter simply referred to as “resistance”) is, the greater the inertial rotation amount, the larger this detected value. On the other hand, the greater the resistance, the smaller the amount of inertial rotation, and the smaller the detected value. Thus, this detected value is an example of an index indicating the magnitude of resistance, in other words, the rotation state of the stirring member 5. The microcomputer 30 applies voltage to the motor 6 while the stirring member 5 is rotating. The detection value is calculated from the inertial rotation amount of the motor 6 after stopping.

  Returning to FIG. 5, the microcomputer 30 acquires the detection value B in the first inertial rotation state detection in step S4, acquires the detection value C in the second inertial rotation state detection in step S5, and step S6. In the third inertial rotation state detection at, the detection value D is acquired. When the laundry Q in the washing tub 4 is rounded into a spherical shape and becomes unsuitable for the dehydration process (see FIG. 4), the contact area between the laundry Q and the stirring member 5 becomes narrow, so that the resistance is less than a predetermined value. It decreases and the stirring member 5 rotates smoothly. Therefore, the detection value in the inertial rotation state detection increases with the passage of time in the order of the detection value B, the detection value C, and the detection value D.

  Therefore, the microcomputer 30 detects the detected value C in the case where the load amount is so large that the detected value A is less than the first threshold, even though the resistance is large enough that the detected value B is less than the second threshold. It is determined whether the resistance has decreased to a value less than a predetermined value such that the sum of the detected value D and the detected value D exceeds the third threshold value (step S7). The first threshold value, the second threshold value, and the third threshold value are different predetermined threshold values. For example, if 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 value due to the load amount being larger than a predetermined value, if the sum of the detected value C and the detected value D exceeds the third threshold value because the resistance is less than the predetermined value. (YES in step S7), the microcomputer 30 determines that the laundry Q in the washing tub 4 is rounded into a spherical shape and is not suitable for the dehydration process (step S8). As a result, it can be found in the washing process at an earlier stage than the dehydration process that the laundry Q in the washing tub 4 is not suitable for the dehydration process.

  In particular, the inertial rotation amount described above increases as the resistance decreases and decreases as the resistance increases. Therefore, in the inertial rotation state detection, by calculating the detection values B to D from the inertial rotation amount that changes in conjunction with the increase / decrease of the resistance in this way, these accurate indexes suitable for the determination in step S7 are Detection values B to D can be acquired. Incidentally, in the load amount detection described above, there is a difference in that the inertia rotation amounts a and b are measured before water supply, and in the inertia rotation state detection, the inertia rotation amounts c and d are measured after water supply. In the case of load amount detection, considering that dry laundry and wet laundry are mixed, inertia rotation amount c in inertial rotation state detection executed in a state where all the laundry is evenly wetted, d is a reliable value in the determination in step S7.

  In addition, when the load amount of the laundry Q in the washing tub 4 is less than a predetermined value so that the detection value A does not fall below the first threshold, the laundry Q is unlikely to be in a spherical state that is not suitable for the dehydration process. . Therefore, in step S7, when the load amount of the laundry Q is larger than a predetermined value, the laundry Q is not suitable for the dehydration process when the second index, the detection value A, is over the first threshold. It can be determined whether or not there is.

  When the microcomputer 30 determines that the laundry Q in the washing tub 4 is in a spherical shape and is not suitable for the dehydration process, the microcomputer 30 stops the stirring member 5 and executes special drainage (step S8). 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 to the outside as special drainage. After the special drainage, the microcomputer 30 resumes the rotation of the stirring member 5 and continues to wash the laundry Q (step S9). Accordingly, the laundry Q in a state of being curled in the washing tub 4 becomes easy to come into contact with the stirring member 5 by lowering the buoyancy as the water level is lowered, so that the stirring member whose rotation is resumed 5 easily breaks down. As a result, it is possible to eliminate the state where the laundry Q is not suitable for the dehydration process. If the laundry Q is in a state suitable for the dehydration process, the laundry operation can smoothly proceed to the dehydration process.

  The following 1st-4th Example is mentioned about the process after step S9 in a washing process. In the case of the first embodiment shown in FIG. 8, the microcomputer 30 continues to operate by continuously rotating the stirring member 5 after a predetermined time from the start of the washing step, for example, until the end time after 10 minutes ( Step S10). If the sum of the detected value B and the detected value C becomes equal to or smaller than the third threshold value because the resistance hardly decreases (NO in step S7), the laundry Q is already suitable for the dehydration process. Therefore, the microcomputer 30 continues the operation by continuously rotating the stirring member 5 from step S3 without performing the processing of step S8 and step S9 (step S10). When the end time is reached, the microcomputer 30 ends the washing process. In the case where the washing process is 10 minutes, for example, the process from step S1 to S7 is executed in about 5 minutes in the first half, and the process from step S8 to S10 is executed in about 5 minutes in the second half.

  FIG. 9 is a flowchart showing a control operation according to the second embodiment. 9 and FIG. 9 and subsequent figures, the same processing steps as those in FIG. 5 to FIG. 8 are denoted by the same step numbers, and detailed description of the processing steps is omitted. In the case of the second embodiment shown in FIG. 9, the microcomputer 30 newly performs inertial rotation state detection in the state where the rotation of the stirring member 5 is restarted in step S <b> 9, and also performs maximum rotation number integrated value detection. Execute (Step S11). In the inertial rotation state detection, the microcomputer 30 acquires the detection value E by the procedure described with reference to FIG.

  FIG. 10 is a flowchart showing a control operation related to detection of the maximum rotational speed integrated value. Referring to FIG. 10, the microcomputer 30 rotationally drives the stirring member 5 in the forward direction for a predetermined time in a state where water has accumulated in the washing tub 4 to the specified water level with the start of detection of the maximum rotation number integrated value. The maximum rotational speed of the motor 6 is measured (step S301). Note that the predetermined time here is the same as the time during which the stirring member 5 rotates forward for washing the laundry Q. That is, the maximum rotational speed integrated value is detected as part of the forward rotation of the stirring member 5 for cleaning. The maximum number of rotations when the motor 6 rotates in the positive direction when the maximum number of rotations integrated value is detected as in step S301 is referred to as “maximum number of rotations e”.

  Next, the microcomputer 30 measures the maximum number of rotations of the motor 6 when the stirring member 5 is rotationally driven in the reverse direction for a predetermined time while water is continuously accumulated in the washing tub 4 to the specified water level (step S302). ). The predetermined time here is the same as the time for the stirring member 5 to reversely rotate for washing the laundry Q. That is, the maximum rotational speed integrated value is detected as part of the reverse rotation of the stirring member 5 for cleaning. The maximum number of rotations when the motor 6 rotates in the reverse direction when the maximum number of rotations integrated value is detected as in step S302 is referred to as “maximum number of rotations f”. Note that the order of step S301 and step S302 may be reversed.

  When the microcomputer 30 repeats the processes of steps S301 and S302 a plurality of times, for example, 16 times (YES in step S303), the microcomputer 30 obtains the total of the maximum number of revolutions e and the maximum number of revolutions f16 times. The obtained value is set as the maximum rotational speed integrated value F (step S304). The smaller the resistance is, the larger the maximum number of revolutions e and f becomes, so the maximum number of revolutions integrated value F also becomes larger. On the other hand, the greater the resistance, the smaller the maximum rotational speed e and f, so the maximum rotational speed integrated value F also decreases. Thus, this maximum rotational speed integrated value F is an example of an index indicating the magnitude of resistance, and the microcomputer 30 rotates from the maximum rotational speed of the motor 6 within the predetermined period during the rotation of the stirring member 5 to the maximum rotational speed. The number integration value F is calculated.

  Returning to FIG. 9, in step S <b> 11, the microcomputer 30 acquires the detection value E by detecting the inertial rotation state and acquires the maximum rotation speed integrated value F by detecting the maximum rotation speed integration value.

  Therefore, even though the microcomputer 30 has executed the first special drainage (step S8), the detected value E exceeds the fourth threshold value, or the maximum rotational speed integrated value F exceeds the fifth threshold value. It is confirmed whether or not the resistance has decreased (step S12). The fourth threshold and the fifth threshold are predetermined thresholds that are different from each other and are different from the first threshold, the second threshold, and the third threshold. For example, when 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), if the detected value E exceeds the fourth threshold value or the maximum rotational speed integrated value F exceeds the fifth threshold value because the resistance is less than the predetermined value (YES in step S12). The microcomputer 30 determines that the laundry Q in the washing tub 4 does not collapse and is not suitable for the dehydration process. As a result, it can be found in the washing process at an earlier stage than the dehydration process that the laundry Q in the washing tub 4 is not suitable for 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, by calculating the maximum rotational speed integrated value F from the maximum rotational speed that changes in conjunction with the increase / decrease in resistance in this way, the maximum rotational speed integrated value F is acquired as an accurate index suitable for the determination in step S12. can do.

  When the microcomputer 30 determines that the laundry Q is still unsuitable for the dehydration step, the microcomputer 30 stops the stirring member 5 and executes the second special drainage to lower the water level in the washing tub 4. (Step S13). However, in the second special drainage, the water level in the washing tub 4 is lowered to a predetermined water level lower than that in the first special drainage. After the second special drainage, the microcomputer 30 resumes the rotation of the stirring member 5 and continues washing the laundry Q (step S14). At this time, the microcomputer 30 increases the water flow in the washing tub 4 by extending the rotation time of the stirring member 5 in the forward direction and the reverse direction, for example, from 1.8 seconds to 2.1 seconds. The washing of the laundry Q is continued in the strengthened state (step S14).

  The microcomputer 30 continues to operate until the end time (step S10). If the total of the detected value C and the detected value D does not exceed the third threshold value because the resistance hardly decreases (NO in step S7), the microcomputer 30 performs steps S8, S9, and steps S11 to S14. Without performing the process, the operation is continued by continuously rotating the stirring member 5 from step S3 (step S10). 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 newly executes inertial rotation state detection in the state where the rotation of the stirring member 5 is restarted in step S9, and acquires the detection value E. The maximum rotational speed integrated value detection is executed to acquire the maximum rotational speed integrated value F (step S11). If the detected value E exceeds the fourth threshold value or the maximum rotational speed integrated value F exceeds the fifth threshold value (YES in step S12), the microcomputer 30 stops the stirring member 5 and executes 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 washing the laundry (step S15). At this time, unlike step S14 of the second embodiment, the microcomputer 30 extends the washing process by setting a postponement of the end time of the washing process (step S15). As described above, the extension time in the case of the washing process for 10 minutes is, for example, 2 minutes.

  The microcomputer 30 continues operation until the extended end time (step S10). If the sum of the detected value C and the detected value D does not exceed the third threshold value because the resistance hardly decreases (NO in step S7), the microcomputer 30 performs steps S8, S9, steps S11 to S13, and By continuing to rotate the stirring member 5 from step S3 without performing the process of step S15, the operation is continued until the normal end time before the extension (step S10). 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 newly executes inertial rotation state detection in the state where the rotation of the stirring member 5 is resumed in step S9, and acquires the detection value E. The maximum rotational speed integrated value detection is executed to acquire the maximum rotational speed integrated value F (step S11). If the detected value E exceeds the fourth threshold value or the maximum rotational speed integrated value F exceeds the fifth threshold value (YES in step S12), the microcomputer 30 stops the stirring member 5 and executes the second special drainage. (Step S13).

  Then, after the second special drainage, the microcomputer 30 resumes the rotation of the stirring member 5 and continues washing the laundry (step S16). At this time, the microcomputer 30 sets the postponement of the end time of the washing process as in step S15 of the third embodiment, and also strengthens the water flow in the washing tub 4 as in step S14 of the second embodiment. The washing of the laundry is continued (step S16).

  The microcomputer 30 continues operation until the extended end time (step S10). If the sum of the detected value C and the detected value D does not exceed the third threshold value because the resistance hardly decreases (NO in step S7), the microcomputer 30 performs steps S8, S9, steps S11 to S13, and The stirring member 5 is continuously rotated from step S3 without performing the process of step S16. 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 remains normal (step S10). When the end time is reached, the microcomputer 30 ends the washing process.

  In the second to fourth embodiments, when the state in which the laundry Q is not suitable for the dehydration process is not solved by the first special drainage, the microcomputer 30 executes the special drainage again in step S13. In steps S14 to S16, at least one of a process for strengthening the water flow in the washing tub 4 and a process for extending the washing process is executed. Therefore, the laundry Q in a state of being curled in the washing tub 4 comes into contact with the stirring member 5 more easily than the first special drainage as the water level in the second special drainage in step S13 decreases. The stirring member 5 whose rotation has been resumed is easily broken. Further, the laundry Q is easily broken by a strong water flow in the washing tub 4. Further, along with the extension of the washing process, the above-described mechanical force acts on the laundry Q, so that the laundry Q is easily broken. As a result, the state where the laundry Q is not suitable for the dehydration process can be solved.

  In the dehydration process after the washing process, the microcomputer 30 opens the drain valve 19 and, as described above, the first rotation speed of 120 rpm, the second rotation speed of 240 rpm, and the third rotation speed of 800 rpm are 3 In step, the rotation speed of the motor 6 is accelerated to rotate the washing tub 4. At this time, if the laundry Q is in an unevenly arranged state in the washing tub 4, the duty ratio of the voltage applied to the motor 6 is difficult to decrease, or the rotational speed of the motor 6 is difficult to increase. Phenomenon occurs. When these phenomena occur in the dehydration process, the microcomputer 30 determines that there is a bias of the laundry Q in the washing tub 4, that is, a so-called imbalance. When the bias of the laundry Q is larger than a predetermined value, the microcomputer 30 executes the correction process shown in FIG. 13 in order to interrupt the dehydration process and correct the bias of the laundry Q.

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

  If the special drainage is not executed in the current washing operation (NO in step S21), the microcomputer 30 supplies water to the washing tub 4 up to a preset normal set water level and accumulates water (step S22). . The microcomputer 30 rotates the stirring member 5 for a predetermined time with water stored in the washing tub 4 to the set water level (step S23). Thereby, since the laundry Q softened by being immersed in water is broken by the stirring member 5, the bias of the laundry Q can be corrected. When the predetermined time has elapsed, the microcomputer 30 opens the drain valve 19 and drains the washing tub 4 (step S24). Thereby, the correction process ends. After the correction process, the dehydration process is resumed.

  On the other hand, when special drainage is performed in the washing process of the present washing operation (YES in step S21), in the dehydration process after the washing process, the dehydration process is performed because the laundry Q is biased in a spherical shape. There is a possibility that it is in a state not suitable for. Therefore, the microcomputer 30 sets the set water level of the water stored in the washing tub 4 in the correction process after the washing process lower than the normal case where the special drainage is not executed (step S25). The microcomputer 30 supplies water to the washing tub 4 up to a set water level set lower than usual to accumulate water (step S22), and then rotates the stirring member 5 for a predetermined time (step S23). As a result, the laundry Q curled up in the washing tub 4 is lowered to the stirring member 5 side during correction processing due to weak buoyancy, and is easily brought into contact with the stirring member 5. It becomes easy. As a result, it is possible to eliminate the state where the laundry Q is not suitable for the dehydration process. When the predetermined time elapses, the microcomputer 30 drains the washing tub 4 (step S24) and ends the correction process.

  The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the claims.

  For example, in step S7 (see FIG. 5) described above, instead of the sum of the detection value C and the detection value D, only the detection value C or the detection value D may be used for determination. Specifically, in step S7, the microcomputer 30 has a resistance so high that the detected value B is less than the second threshold when the detected value A is less than the first threshold. Nevertheless, it is confirmed whether or not the resistance has decreased to the extent that the detection value C or D exceeds the predetermined sixth threshold value. If the detected value A exceeds the first threshold due to the load amount being greater than or equal to the predetermined value, and if the detected value C or D exceeds the sixth threshold value due to the resistance being less than the predetermined value (YES in step S7), the micro The computer 30 determines that the laundry Q in the washing tub 4 is rounded into a spherical shape and is not suitable for the dehydration process.

  Further, in step S7, the determination may be made based on the maximum rotation number integrated value F instead of the detection value C, the detection value D, or the total of these. Specifically, in step S7, the microcomputer 30 has a resistance so high that the detected value B is less than the second threshold when the detected value A is less than the first threshold. Nevertheless, it is confirmed whether or not the resistance has decreased to the extent that the maximum rotational speed integrated value F exceeds a predetermined seventh threshold value. If the detected value A exceeds the first threshold due to the load amount being greater than or equal to a predetermined value, and if the maximum rotational speed integrated value F exceeds the seventh threshold value due to the resistance being less than the predetermined value (YES in step S7), The microcomputer 30 determines that the laundry Q in the washing tub 4 is rounded into a spherical shape and is not suitable for the dehydration process.

  Moreover, in embodiment mentioned above, while special drainage is performed in step S8 or S13, rotation of the stirring member 5 is stopped, but rotation of the stirring member 5 may be continued until the end time without being stopped. .

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

  In addition, regarding the dehydration process of the above-described embodiment, the final dehydration process executed at the end of the washing operation has been described. However, the dehydration process may be executed immediately after the washing process as an intermediate dehydration process. Alternatively, the correction process shown in FIG. 13 may be executed.

  Moreover, in the washing machine 1, although the center axis 20 of the outer tub 3 and the washing tub 4 is arrange | positioned so that it may extend in the inclination direction K (refer FIG. 1), you may arrange | position so that it may extend in the up-down direction Z.

DESCRIPTION OF SYMBOLS 1 Washing machine 4 Washing tank 5 Stirring member 6 Motor 30 Microcomputer c Inertial rotation amount d Inertial rotation amount e Maximum rotation number f Maximum rotation number A Detection value C Detection value D Detection value E Detection value F Maximum rotation number integrated value Q Washing Z2 downward

Claims (7)

A laundry tub for storing laundry;
A stirring member disposed in a position facing the laundry from below in the washing tub and rotatable to stir the laundry in the washing tub;
A motor for rotating the stirring member;
A washing step of rotating the agitating member in a state where water is stored in the washing tub, wherein the agitating member is rotated by supplying and draining water to the washing tub and controlling a voltage applied to the motor. And execution means for executing a washing operation including a dehydration step after the washing step,
Threshold setting means for setting a predetermined threshold according to the load amount of the laundry in the washing tub;
In the washing step, an acquisition unit that acquires an index indicating a magnitude of resistance that the laundry in the washing tub gives to the rotation of the stirring member;
In the washing step, when the resistance is less than a predetermined value and the index exceeds the predetermined threshold, the determination unit determines that the laundry in the washing tub is not suitable for the dehydration step;
A washing machine comprising:   The said acquisition means calculates the said parameter | index from the inertial rotation amount of the said motor after the said execution means stops the application of the voltage with respect to the said motor during rotation of the said stirring member, It is characterized by the above-mentioned. Washing machine.   3. The washing machine according to claim 1, wherein the acquisition unit calculates the index from the maximum number of rotations of the motor within a predetermined period during rotation of the stirring member. A second acquisition means for acquiring a second index indicating the magnitude of the load of the laundry in the washing tub;
When the second index exceeds a threshold different from the predetermined threshold due to the load amount being greater than a predetermined value, the determination means determines that the laundry in the washing tub is not suitable for the dehydration process. The washing machine according to any one of claims 1 to 3, wherein it is determined whether or not it is in the washing machine.   When the determination unit determines that the laundry in the washing tub is not suitable for the dehydration step, the execution unit executes the special drainage of the washing tub in the washing step. The washing machine according to any one of claims 1 to 4, wherein the inside water level is lowered to a predetermined water level. The washing tub is rotatable, the motor can rotate the washing tub, and the execution means rotates the washing tub by controlling a voltage applied to the motor in the dehydration process. Let
When there is a laundry bias in the washing tub in the dehydration step, the execution means is configured to store the stirring member in a state where water is accumulated in the washing tub to a set water level in order to correct the laundry bias. Execute the correction process to rotate
When the special drainage is executed in the washing process, the apparatus further includes setting means for setting the set water level in the correction process after the washing process lower than that in the case where the special drainage is not executed. The washing machine according to claim 5.   In the washing step, when the index acquired by the acquisition unit after the special drainage exceeds the predetermined threshold, the execution unit executes the special drainage again, and then the water flow in the washing tub is changed. The washing machine according to claim 5 or 6, wherein at least one of a strengthening process and a process of extending the washing step is executed.

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