KR20170094398A - Dehydrator - Google Patents

Abstract

The present invention provides a dehydrator capable of initially suppressing the eccentric rotation of a dewatering tank arranged obliquely. The dehydrator (1) has a dehydrator (4) formed into a tubular shape having a central axis (17) extending in an inclined direction (K) with respect to the up and down direction (Z); A hollow ring shaped balance ring 19 accommodated in the dewatering vessel 4 so as to freely flow the liquid for obtaining the rotational balance of the dewatering vessel 4 and mounted on the dewatering vessel 4 in a coaxial state; And a control unit (30). . The control unit 30 rotates the dehydrator 4 at a rotational speed lower than the minimum rotational speed at which the dehydrator 4 generates resonance at the preparation stage for dehydrating the laundry Q in the dehydrator 4 The laundry Q displaced in the dewatering tank 4 is moved downward in the balance ring 19 with the central axis 17 therebetween by detecting the shift position of the laundry Q in the dewatering tank 4, The rotation of the dehydrator 4 is stopped immediately before it is positioned on the opposite side of the liquid displaced by the Z2.

Description

Dehydrator {DEHYDRATOR}

The present invention relates to a dehydrator.

The following Patent Document 1 discloses a washing machine having a dehydration function. A tubular drum for accommodating laundry in the washing machine is disposed such that its central axis is inclined with respect to a vertical line. Therefore, the upper portion of the washing tub is inclined so as to protrude toward the front side of the washing machine.

[Prior Art Literature]

<Patent Literature>

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-312795

In the dehydrator in which the laundry is accommodated in a dehydrator arranged in an inclined manner as in the washing machine of Patent Document 1, the laundry is easily shifted in the dehydrator. If the dehydration operation is carried out while the laundry is shifted, the dehydrating tank rotates eccentrically and vibrations are generated. Therefore, in order to prevent vibration from being generated in the dehydrator as much as possible, eccentric rotation of the dehydrator should be suppressed initially.

An object of the present invention is to provide a dehydrator capable of initially suppressing the eccentric rotation of a dewatering vessel arranged obliquely.

The dehydrator according to the present invention is a dehydrator which is formed in a tubular shape having a central axis extending in an oblique direction with respect to the up-and-down direction and rotates around the central axis to receive laundry and dehydrate the laundry. A balance ring which is formed in a hollow annular shape to be mounted on the dehydrating tank in a coaxial state and in which a liquid for obtaining a rotational balance of the dehydrating tank freely flows; And rotating the dehydrator at a rotational speed lower than a minimum rotational speed at which the dehydrator generates resonance in a preparation step for dehydrating the laundry to detect a position of the laundry in the dehydrator, A dewatering preparation unit for stopping the rotation of the dewatering tank immediately before the laundry laid down on the opposite side of the liquid shifted downward in the balance ring with the center axis interposed therebetween; And a control unit.

The dehydrator according to the present invention is a dehydrator which is formed in a tubular shape having a central axis extending in an oblique direction with respect to the up-and-down direction and rotates about the central axis to receive laundry and dehydrate laundry. An electric motor for rotating the dehydrating tank; An information value obtaining unit that sequentially obtains an information value to be decreased as the rotational speed of the motor is increased in an acceleration state in which the motor accelerates to a target rotational speed at which the laundry is dewatered in earnest; A counting unit which adds 1 to a count value whose initial value is 0 when the information value obtaining unit obtains the information value each time; An accumulated value of the difference between the information value and the previous information value when the information value is larger than the previous information value is calculated A calculation unit; A determining unit that determines that the laundry has shifted in the dehydrating tank when the integrated value when the count value is a predetermined value reaches a first threshold value when the count value is the predetermined value; And a stop unit for stopping the rotation of the dehydrator when the determination unit determines that the laundry has been shifted. And a control unit.

Further, the present invention is characterized by further comprising an information correction unit for correcting the information value through a moving average before calculating the integrated value using the calculation unit .

Further, the present invention is characterized in that, when the stop unit has stopped rotating the dehydrating tub, any one of a restarting process of rotating the dehydrating tub again to dehydrate the laundry and a correcting process of correcting the deviation of the laundry in the dehydrating tub Wherein the execution unit does not select and execute the restart processing when the stop unit stops the rotation of the dehydration tank after the restart processing is executed a predetermined number of times, And executes the selected program.

Further, the present invention includes an acceleration unit for accelerating the rotation of the motor in three steps, i.e., a first acceleration step, a second acceleration step and a third acceleration step, From the start of rotation toward the speed, the dewatering vessel is accelerated to a first rotational speed which is higher than the rotational speed at which resonates transversely occurs and the dehydrating tank is lower than the rotational speed at which resonates longitudinally occurs , The second acceleration step is an acceleration step from the first rotation speed to a second rotation speed higher than the first rotation speed and the third acceleration step is an acceleration step from the second rotation speed to the target rotation speed , The first threshold value is independently set in the first acceleration step, the second acceleration step and the third acceleration step, Obtains the information value in the first acceleration step, the second acceleration step and the third acceleration step, respectively, and the count unit adds 1 to the count value, and the calculation unit calculates the integrated value , And when the integrated value reaches the first threshold value, the determination unit determines that the laundry is shifted in the dehydrating tank.

Further, the present invention may further comprise: a duty ratio acquisition unit for acquiring a duty ratio of a voltage applied to the motor at every predetermined time in the third acceleration step; And a conversion unit for converting the duty ratio acquired by the duty ratio acquisition unit into a predetermined index value; Wherein the judging unit judges that the laundry has been shifted in the dehydrating tank when the index value reaches the second threshold value of the corresponding time.

The present invention also includes a threshold changing unit for changing the second threshold value according to the integrated value of at least one of the first acceleration step, the second acceleration step and the third acceleration step .

Further, the present invention is characterized in that, when the amount of change in the integrated value reaches the third threshold value, the determination unit determines that the laundry is shifted in the dehydrating tank.

The dehydrator according to the present invention is a dehydrator which is formed in a tubular shape having a central axis extending in an oblique direction with respect to the up-and-down direction and rotates about the central axis to receive laundry and dehydrate laundry. An outer tank for receiving the dehydrating tank; An electric motor for rotating the dehydrating tank; A determining unit for determining that laundry has been shifted in the dewatering tank when an information value related to the rotational state of the motor at which the rotational speed of the motor reaches a target rotational speed for dewatering the laundry is reached to a threshold value; A sensing unit mechanically sensing eccentric rotation of the dewatering bowl in contact with the outer tub when the dewatering bowl is rotated by eccentric rotation according to the deviation of the laundry in the dehydrating tub; A stop unit for stopping the rotation of the dewatering vessel according to occurrence of any one of the cases where the determination unit determines that laundry has been shifted and the sensing unit detects eccentric rotation of the dewatering vessel; And when the difference between the information value and the threshold value is equal to or greater than a predetermined value when the sensing unit senses eccentric rotation of the dehydrating tank or when the determining unit determines that the laundry has been shifted before sensing the eccentric rotation A threshold correcting unit for correcting the threshold value; And a control unit.

The dehydrator according to the present invention is a dehydrator which is formed in a tubular shape having a central axis extending in an oblique direction with respect to the up-and-down direction and rotates about the central axis to receive laundry and dehydrate laundry. An outer tank for receiving the dehydrating tank; An electric motor for rotating the dehydrating tank; A determining unit for determining that laundry has been shifted in the dewatering tank when an information value related to the rotational state of the motor at which the rotational speed of the motor reaches a target rotational speed for dewatering the laundry is reached to a threshold value; A sensing unit mechanically sensing eccentric rotation of the dewatering bowl in contact with the outer tub when the dewatering bowl is rotated by eccentric rotation according to the deviation of the laundry in the dehydrating tub; A stop unit for stopping the rotation of the dewatering vessel according to occurrence of any one of the cases where the determination unit determines that laundry has been shifted and the sensing unit detects eccentric rotation of the dewatering vessel; And a suspending unit for suspending the rotation stop of the dehydration tank by the stop unit until the detection unit reaches a predetermined number of times before the determination unit determines that the laundry has been shifted. And a control unit.

According to the present invention, the dehydrator of the dehydrator is formed in a tubular shape having a central axial line extending in an inclined direction with respect to the up-and-down direction, so that it is inclined. The hollow annular balance ring is mounted in the dewatering vessel in a coaxial state. Therefore, in the state where the dehydration tank is stopped, the liquid contained in the inside of the balance ring is disposed in the balance ring so as to be shifted downward.

In the dewatering tank, it is assumed that the laundry is shifted to the same position as the liquid disposed in the balance ring so as to be shifted downward in the rotating direction of the dewatering tank. In this state, when the dehydrating tank starts to rotate to dehydrate the laundry, the dehydrating tank rotates eccentrically from the start of rotation.

Therefore, in the dewatering preparation stage of the dehydrator, the dewatering preparation unit senses the position of the laundry in the rotating direction in the spinning water bath by rotating the spinneret at extremely low speed at a rotational speed lower than the minimum rotational speed at which resonance of the dehydrating tank occurs. The dewatering preparation unit stops the rotation of the dehydration tank just before the laundry that has been shifted in the dehydration tank is positioned on the opposite side of the liquid shifted downward in the balance ring with the center axis interposed therebetween.

In addition, since the rotation of the dehydrating tank is stopped when the laundry laid in the dehydrating tank is located on the opposite side of the liquid in the balance ring with the center axis interposed therebetween, the dehydrating tank is rotated by inertia So that the laundry is eventually positioned on the same side as the liquid in the balance ring.

Therefore, if the rotation of the dehydrating tank is stopped immediately before the laundry laid in the dehydrating tank is positioned on the opposite side of the liquid in the balance ring with the central axis interposed therebetween, Is maintained on a position substantially opposite to the center axis line. When the dehydrating bath is rotated for dehydration after this preparation step, the dehydrating bath rotates the liquid in the balance ring and the laundry in an approximately balanced state. This makes it possible to suppress eccentric rotation of the dewatering vessel which is initially disposed obliquely.

According to the present invention, the dehydrator of the dehydrator is arranged in a tubular shape inclined with a central axis extending in an oblique direction with respect to the up-and-down direction. In a dehydrator for rotating a dewatering tank using a motor, an information value to be reduced is sequentially obtained as the rotational speed of the motor is increased in a state where the motor is accelerated to a target rotational speed at which laundry is dewatered in earnest, When getting the value, 1 is added to the count value whose initial value is 0.

When the laundry is shifted in the dewatering tank, the information value to be originally reduced varies, and the information value at a certain time becomes larger than the previous information value. In this case, the accumulated value of the difference between the information value and the previous information value is greater than zero. When the dehydrating tank continuously rotates in a state where the laundry is shifted in the dehydrating tank, the integrated value becomes larger.

When the accumulated value when the count value reaches the first threshold value reaches the first threshold value when the count value is the predetermined value, it is determined that the laundry in the dehydration tank has shifted and the rotation of the dehydrating tank is stopped. Therefore, when the laundry in the dewatering tank is shifted in an inclined manner, eccentric rotation of the dewatering tank can be initially suppressed in the accelerated state of the motor.

According to the present invention, the information value used in the process of calculating the integrated value is corrected through a moving average before calculating the integrated value, which is a highly accurate value obtained by eliminating the error. Therefore, the integrated value of high accuracy is calculated according to the corrected information value, and the eccentric rotation of the dewatering tank can be initially suppressed by detecting the deviation of the laundry with high accuracy through the integrated value.

According to the present invention, when the rotation of the dewatering tank is judged to be shifted in the dehydrating tank, the washing operation is selected and executed. In the restarting process, the dehydrating tank is rotated again Is a treatment for starting to dehydrate the laundry, and a correction treatment is a treatment for correcting the deviation of the laundry in the dehydration tank.

If the deviation of the laundry is small enough to prevent eccentric rotation of the dewatering tank, the dewatering is started again through the restarting process, so that the time required for the entire dewatering process can be shortened as much as possible. In the case of the next dehydration, if the deviation of the laundry is large enough to cause the dehydration bath to rotate eccentrically, the deviation of the laundry can be reliably corrected through the correction process.

When the rotation of the dehydrating tank is stopped after the restarting process is executed a predetermined number of times, it means that the deviation of the laundry is large enough to require correction. In this case, it is possible to reliably correct the deviation by executing the correction processing more quickly without wasting time in repeatedly performing the restarting process and the rotation stopping of the dehydration tank. From this, eccentric rotation of the dewatering tank can be initially suppressed.

According to the present invention, in the first acceleration step, the second acceleration step and the third acceleration step from the start of rotation of the motor to the arrival of the target rotation speed, the integrated value is calculated, When the first threshold value corresponding to the first acceleration step, the second acceleration step and the third acceleration step is reached, it is determined that the laundry in the dehydration tank has shifted and the rotation of the dehydration tank is stopped. That is, the detection of the deviation of the laundry proceeds in the first acceleration step in which the motor starts to rotate, so that the eccentric rotation of the dewatering tank can be initially suppressed. In addition, since the laundry is divided into three stages in accordance with the sequence of the first acceleration step, the second acceleration step and the third acceleration step, it is possible to detect when the laundry is shifted reliably, The eccentric rotation of the dewatering tank can be suppressed.

According to the present invention, the duty cycle obtained according to the predetermined time in the third acceleration step is converted into a predetermined index value, and when the index value reaches the second threshold value of the corresponding time, It can be judged that the laundry having the laundry is turned over. That is, in the third acceleration step, whether or not the laundry in the dewatering tank is deviated is doubly detected through the mode using the information value and the first threshold value and the mode using the duty ratio and the second threshold value, so that the eccentric rotation Can be suppressed at an early stage.

According to the present invention, since the second threshold value is appropriately changed according to the integrated value of at least one of the first acceleration step, the second acceleration step and the third acceleration step, the second threshold value changed according to the state of the dehydration tank is The eccentric rotation of the dewatering tank can be initially suppressed since it can be detected with high accuracy whether or not the laundry is shifted.

According to the present invention, whether or not the laundry in the dehydration tank is deviated is detected doubly through the mode of whether the integrated value itself reaches the first threshold value or whether the variation of the integrated value reaches the third threshold value. In this case, even when the dehydration tank is in a state of vigorous oscillation, the eccentric rotation of the dehydration tank can be surely suppressed at an early stage according to the amount of change in the accumulated value, even if the integrated value itself is small enough not to reach the first threshold value.

According to the present invention, the dehydrator of the dehydrator is tubular with a central axis extending in an inclined direction with respect to the up-and-down direction, and is arranged obliquely. The deviation of the laundry in the dehydration tank is detected in duplicate through an electrical mode based on the relationship between the information value and the threshold value associated with the rotational state of the motor, and a mechanical mode based on the sensing unit contacting the outer tank.

In the dehydrator in the shipping stage, there may be a case in which the threshold value is not accurate due to the difference in the dehydration tank gradient between the dehydrator objects and the like. Therefore, when the difference between the information value and the threshold value sensed by the sensing unit during the eccentric rotation is equal to or greater than a predetermined value, or when the determination unit determines the shift of the laundry before the eccentric rotation is sensed, Proceed with calibration. Accordingly, in the dehydration process after the threshold value is corrected, the eccentric rotation of the dehydration tank can be initially suppressed because the presence or absence of the laundry can be detected with high accuracy through the corrected threshold value in the electric mode.

According to the present invention, the dehydrator of the dehydrator is tubular with a central axis extending in an inclined direction with respect to the up-and-down direction, and is arranged obliquely. The deviation of the laundry in the dehydration tank is detected in duplicate through an electrical mode based on the relationship between the information value and the threshold value associated with the rotational state of the motor, and a mechanical mode based on the sensing unit contacting the outer tank.

Assuming one case, the vibration of the dewatering tank is not large, but when the sensing unit is easily in contact with the outer tank due to the motion of the outer tank, an error detection occurs in the mechanical mode to stop the rotation of the dewatering tank. Therefore, the rotation stop of the dehydration tank is suspended until the number of times the detection unit has detected a predetermined number of times before the determination unit determines that the deviation of laundry is present. Accordingly, it is possible not only to prevent the rotation stop of the dewatering tank due to the error detection of the mechanical mode, but also to suppress the eccentric rotation of the dewatering tank at an early stage.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic longitudinal section right side view of a dehydrator according to an embodiment of the present invention; Fig.
2 is a block diagram showing the electrical configuration of the dehydrator.
3 is a time chart showing the state of the output signal of the Hall IC (Hall IC) constituting the rotational speed reading device for reading the rotational speed of the motor.
4 is a time chart showing the state of the motor rotation speed in the dehydration operation process performed in the dehydrator.
5 is a schematic view showing the inside of the dehydrating tank.
6 is a time chart showing the state of the motor rotation speed in the dewatering operation preparation step.
7 is a flow chart showing the control operation in the dewatering operation preparation step.
8 is a flowchart showing the control operation of the first acceleration step of the motor in the dewatering operation process.
9A is a flowchart showing a control operation for each of the sensing 1 to the sensing 3 for detecting whether or not the laundry in the dehydrating tank is deviated in the first to third acceleration stages of the motor.
9B is a flowchart showing the control operation for each of the sensing 1 to the sensing 3.
10 is a diagram showing the relationship between the count value n and the moving average value C _n by combining the sensing 1 to the sensing 3.
11 is a diagram showing the relationship between the count value n and the integrated value G by combining the sensing 1 to the sensing 3.
12 is a flowchart showing the control operation in the case where the detection result is NG.
13 is a flowchart showing the control operation in the second acceleration step of the motor.
14 is a flowchart showing the control operation in the third acceleration step of the motor.
15 is a flowchart showing the outline of the detection 4-1 and the detection 4-2 for detecting whether or not the laundry in the dehydration tank is deviated in the third acceleration step.
16 is a flowchart showing a control operation for the detection 4-1.
17 is a diagram showing the relationship between the rotation speed and the movement cumulative value C _m by combining the detection 4-1 and the detection 4-2.
18 is a flowchart showing the control operation for the detection 4-2.
19 is a flowchart showing a first modification of the control operation of the sensing 3 in the third acceleration step.
20 is a schematic view showing the inside of the dehydrating tank in the dehydrating operation process.
21 is a flowchart showing a second modification of the control operation of the sensing 3 in the third acceleration step.
22 is a flowchart showing the control operation of the third modified example in the dewatering operation process.
23 is a flowchart showing the control operation of the third modification.
24 is a flowchart showing the control operation of the fourth modification.
25 is a flowchart showing the control operation of the fifth modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an exemplary longitudinal section right side view of a dehydrator according to one embodiment of the present invention. The vertical direction in Fig. 1 is referred to as the vertical direction Z of the dehydrator 1 and the left and right direction in Fig. 1 is referred to as the front-back direction Y of the dehydrator 1. First, the outline of the dehydrator 1 will be described . The upward direction is referred to as an upward direction Z1 in the vertical direction Z and the downward direction is referred to as a downward direction Z2. In the forward and backward direction Y, the left side of FIG. 1 is referred to as a front side (Y1), and the right side of FIG. 1 is referred to as a rear side (Y2).

The dehydrator (1) includes all the devices for dehydrating the laundry (Q). Therefore, the dehydrator 1 includes not only an apparatus having a dewatering function but also a washing machine having a dewatering function and a washing and drying machine. Hereinafter, the washing machine will be described with respect to the dehydrator 1, for example.

The dehydrator 1 includes a case 2, an outer tub 3, a dewatering tank 4, a rotary blade 5, an electric motor 6 and a transmission mechanism 7.

For example, the case 2 is made of metal and formed into a box shape. The upper surface 2A of the case 2 is formed to be inclined with respect to the horizontal direction HD so as to extend upward toward the rear direction Y2. An opening 8 for communicating the inside and outside of the case 2 is formed on the upper surface 2A. On the upper surface 2A, a door 9 for opening and closing the opening 8 is provided. An operation section 10 constituted by a liquid crystal operation panel or the like is provided in an area (Y1) ahead of the opening 8 in the upper surface 2A. The user can freely select the dehydration condition by operating the operation unit 10 or instruct the dehydrator 1 to start and stop the operation.

 For example, the outer tub 3 is made of resin and formed into a cylindrical shape having a bottom. The outer tub 3 has a substantially cylindrical circumferential wall 3A arranged along an oblique direction K which is inclined forwardly Y1 with respect to the vertical direction Z; A bottom wall 3B blocking the hollow portion of the circumferential wall 3A in the downward direction Z2; And an annular annular wall 3C projecting toward the centrifugal side of the circumferential wall 3A at the same time bordering the edge on the upper side Z1 side of the circumferential wall 3A. The oblique direction K is not only inclined with respect to the vertical direction Z but also inclined with respect to the horizontal direction HD. An entrance 11 communicating with the hollow portion of the circumferential wall 3A from the upper side Z1 is formed on the inside of the annular wall 3C. And the doorway 11 is in a state in which it faces and communicates with the opening 8 of the case 2 at the lower side Z2. The annular wall 3C is provided with a door 12 for opening and closing the door 11. The bottom wall 3B is formed in a circular plate shape which is perpendicular to the oblique direction K and extends obliquely with respect to the horizontal direction HD and is formed at the distal position of the bottom wall 3B with a through hole 3D) are formed.

Water can be stored in the outer tub 3. The water supply passage 13 connected to the faucet of the tap water is connected to the outer tank 3 at the upper side Z1 and the tap water is supplied into the outer tank 3 through the water supply passage 13. A water supply valve (14) is provided at the middle of the water supply line (13) for opening or closing the water supply to start or stop the water supply. The drainage passage 15 is connected to the outer tank 3 at the lower side Z2 and the water in the outer tank 3 is discharged to the outside through the drainage passage 15. At the middle of the drainage passage 15, there is provided a drainage valve 16 for opening and closing drainage to start or stop drainage.

The dehydrating tank 4 is made of, for example, a metal and has a central axis 17 extending along the oblique direction K. The dehydrating tank 4 is formed in a cylindrical shape smaller than the outer tank 3 and having a bottom, (Q). The dewatering tank 4 has a substantially cylindrical circumferential wall 4A disposed along the oblique direction K and a bottom wall 4B blocking the hollow portion of the circumferential wall 4A from below.

The inner circumferential surface of the circumferential wall 4A is the inner circumferential surface of the dewatering tank 4. The upper end of the inner circumferential surface of the circumferential wall 4A is an entrance 18 for exposing the hollow portion of the circumferential wall 4A in the upward direction Z1. The entrance 18 is opposed to the entrance 11 of the outer tub 3 at the downward direction Z2 and is in a communicating state. The doors 11 and 18 are opened and closed together by the door 12. [ The user of the dehydrator 1 puts the laundry Q into the dehydrating tank 4 or takes it out of the dehydrating tank 4 through the openings 8 and the entrances 11 and 18.

The dewatering tank 4 is accommodated in the outer tank 3 in a coaxial state and is arranged to be inclined with respect to the vertical direction Z and the horizontal direction HD. The dehydrator 4 in a state of being accommodated in the outer tub 3 can rotate about the central axis 17. A plurality of through holes (not shown) are formed in the circumferential wall 4A and the bottom wall 4B of the dewatering tank 4 and water in the outer tank 3 is supplied through the through holes to the outer tank 3 and the dewatering tank 4 ). &Lt; / RTI &gt; Therefore, the water level in the outer tank 3 and the water level in the dehydration tank 4 coincide with each other.

A balance ring 19 formed in a hollow annular shape is mounted coaxially on the upper end of the circumferential wall 4A. The balance ring 19 is a component for reducing the vibration of the dewatering tank 4 during rotation to obtain a rotational balance of the dewatering tank 4. [ In the annular cavity 19A inside the balance ring 19, liquid such as brine for obtaining a rotational balance of the dewatering tank 4 is accommodated to freely flow.

The bottom wall 4B of the dewatering tank 4 is formed in a circular plate shape extending substantially parallel to the bottom wall 3B of the outer tub 3 at the upper side Z1 and spaced from the bottom wall 3B of the outer tub 3, (4C) penetrating the bottom wall (4B) is formed at the centrifugal position corresponding to the bottom wall (17). The bottom wall 4B is provided with a tubular support shaft 20 extending downward (Z2) along the central axis 17 and surrounding the through hole 4C. The supporting shaft 20 is inserted into the through hole 3D of the bottom wall 3B of the outer tub 3 and the lower end of the supporting shaft 20 is located on the lower side Z2 of the bottom wall 3B.

The rotary vane 5 is a so-called pulsator and is formed into a disc shape having a central axis 17 as a centrifugal center and is formed in the dewatering tank 4 along the bottom wall 4B with a dewatering tank 4 And are arranged concentrically. A plurality of vanes 5A arranged radially are provided on the upper surface of the rotary vane 5 from the lower side Z2 toward the entrance 18 of the dewatering tank 4. The rotary vane 5 is provided with a rotary shaft 21 extending downward (Z2) along the central axis 17 from the centrifugal center. The rotary shaft 21 is inserted into the hollow portion of the support shaft 20 and the lower end of the rotary shaft 21 is located on the lower side Z2 of the bottom wall 3B of the outer tub 3.

In this embodiment, the motor 6 is an inverter motor. The motor 6 is disposed in the case 2 at the lower side Z2 of the outer tub 3. The motor (6) has an output shaft (22) that rotates about a central axis (17). The transmission mechanism 7 is located between the lower end of each of the support shaft 20 and the rotation shaft 21 and the upper end of the output shaft 22. [ The transmission mechanism 7 selectively transmits the driving force outputted by the motor 6 through the output shaft 22 to one or both of the support shaft 20 and the rotation shaft 21. The transmitting mechanism 7 can use a known transmitting mechanism.

When the driving force is transmitted from the motor 6 to the support shaft 20 and the rotation shaft 21, the dewatering vessel 4 and the rotary vane 5 rotate around the central axis 17. In the washing operation and the rinsing operation, the laundry Q in the dewatering tank 4 is agitated by the rotating dewatering tank 4 and the vanes 5A of the rotary vanes 5. Further, in the dewatering operation after the washing operation, the dewatering tank 4 and the rotary vane 5 integrally rotate at a high speed, thereby applying centrifugal force to the laundry Q in the dehydrating tank 4. [ As a result, the laundry Q is dehydrated. The rotational direction of the dewatering tank 4 and the rotary vane 5 coincides with the circumferential direction X of the dewatering tank 4.

2 is a block diagram showing the electrical configuration of the dehydrator.

2, the dehydrator 1 includes a dehydration preparation unit, an information value acquisition unit, a count unit, a calculation unit, a determination unit, a stop unit, an information value correction unit, an execution unit, an acceleration unit, a duty ratio measurement unit, A threshold value changing unit, a threshold value correcting unit, and a holding unit. For example, the control unit 30 includes a CPU 31; A memory 32 such as a ROM or a RAM; A timer 33; And a counter 34 as a count unit; And is built in the case 2 (see FIG. 1).

The dehydrator 1 further includes a water level sensor 35, a safety switch 36 used as a sensing unit, and a rotational speed reading device 37. The water level sensor 35, the safety switch 36 and the rotation speed reading device 37 and the motor 6, the transfer mechanism 7, the water supply valve 14, the drain valve 16, And is electrically connected to the control unit 30.

The control unit 30 switches the transmission target of the driving force of the motor 6 to one or both of the support shaft 20 and the rotary shaft 21 by controlling the transmission mechanism 7. [ The control unit 30 controls the opening and closing of the water supply valve 14 and the drain valve 16. As described above, when the user operates the operation unit 10 to select a dehydration condition or the like of the laundry Q, the control unit 30 receives the selection.

The water level sensor 35 is a sensor for sensing the water level of the outer tank 3 and the dehydration tank 4 and the detection result of the water level sensor 35 is input to the control unit 30 in real time.

The safety switch 36 is a switch for detecting the vibration when the dewatering tank 4 is eccentrically rotated as the laundry Q in the dewatering tank 4 is shifted and the outer tank 3 is vibrated. (See FIG. 1) at a predetermined distance from the outer tank 3 along the horizontal direction HD in the horizontal direction HD. When the outer tub 3 is greatly vibrated along the horizontal direction HD as the dewatering tub 4 rotates eccentrically as the laundry Q in the dehydrating tub 4 shifts, Directional safety switch 36, as shown in FIG. Thereby, the safety switch 36 is turned "ON", and mechanically senses the vibration of the outer tub 3, that is, the eccentric rotation of the dewatering tank 4. The detection result of the safety switch 36 is input to the control unit 30 in real time.

The rotational speed reading device 37 is a device for reading the rotational speed of the motor 6 and strictly speaking reading the rotational speed of the output shaft 22 of the motor 6. For example, . The rotational speed read by the rotational speed reading device 37 is input to the control unit 30 in real time. The control unit 30 controls the duty ratio of the voltage applied to the motor 6 according to the input rotation speed to rotate the motor 6 at a desired rotation speed. On the other hand, when the safety switch 36 senses the eccentric rotation of the dewatering tank 4, the control unit 30 brakes the rotation of the motor 6 and stops the rotation of the dewatering tank 4. In this brake, the control unit 30 controls the duty ratio so that the rotation of the motor 6 can be stopped suddenly, and a brake unit (not shown) can be separately provided so that the control unit 30 can start the brake unit So that the rotation of the motor 6 can be suddenly stopped.

For example, in the present embodiment, three Hall ICs 40 are provided. The Hall IC 40 includes a first Hall IC 41, a second Hall IC 42, and a third Hall IC 43, . Here, the motor 6 includes a rotor (not shown) that rotates integrally with the output shaft 22, and N pole magnets and S pole magnets are arranged alternately in the rotation direction of the rotor on the outer peripheral surface of the rotor . When a group consisting of one N pole magnet and an S pole magnet adjacent to each other is referred to as an "NS group &quot;, a plurality of NS groups are arranged side by side in the rotating direction on the outer peripheral surface of the rotor. And the third Hall IC 43 are arranged side by side at regular intervals in the rotation direction of the rotor in this order. When the rotor is rotated, each of the NS series passes sequentially through the Hall ICs 40 along the rotation direction Each of the Hall ICs 40 emits one pulse P. The rotational speed reading device 37 reads the rotational speed of the motor 6 in accordance with the magnitude of the adjacent pulse P interval. The rotational speed is read.

3 is a time chart showing the state of the output signal of the Hall IC (Hall IC) constituting the rotational speed reading device 37 for reading the rotational speed of the motor. In the time chart of Fig. 3, the horizontal axis represents the elapsed time, and the vertical axis represents the "ON" and "OFF" states of the output signals of the Hall ICs. As shown in Fig. 3, the first Hall IC 41, the second Hall IC 42, and the third Hall IC 43 have different timings at which the pulse P is generated. Therefore, when one NS group sequentially passes through each Hall IC 40, the first Hall IC 41, the second Hall IC 42 and the third Hall IC 43 generate the pulses P one by one in this order .

The waveforms of the output signals of the Hall ICs 40 include an "on" state indicating a state in which a pulse P is generated and an "off" The transition from the "off" state to the "on" state, or from the "on" state to the "off" state is referred to as "interrupt W". In one pulse (P), the interrupt (W) is generated twice at the timing at which the pulse (P) is generated and at the timing at which the pulse (P) disappears. When the interrupt W is generated, the effect of this case is input to the control unit 30 in the rotational speed reading device 37 in real time. It should be noted that the number of interrupts W generated during one rotation of the rotor of the motor 6 varies depending on the number of poles of the motor 6.

As shown in Fig. 3, when three Hall ICs 40 are provided as in the present embodiment, for example, after the pulse P1 is eliminated in the first Hall IC 41, the next pulse P2 Six interrupts (W) are generated as a whole in the three Hall ICs 40 in the period R until the generation and disappearance. When the three Hall ICs 40 are viewed as a whole, the interval I from an arbitrary interrupt W to the next interrupt W is always the same in a state in which the motor 6 is stably rotated.

However, even if the motor 6 stably rotates due to the mounting error of the NS group of the motor 6 and the mounting error of each Hall IC 40, the interval I may not be the same. It should be pointed out that when the motor 6 is in the acceleration state, the interval I generally becomes smaller. The interval I may be a value equal to a time unit (e.g., seconds), and when the counter 34 (see FIG. 2) counts once every predetermined period, May be a total value of the numbers.

Next, the dehydration operation performed in the dehydrator 1 will be described.

4 is a time chart showing the state of the motor rotation speed in the dewatering operation process. In the time chart of Fig. 4, the horizontal axis represents the elapsed time and the vertical axis represents the rotational speed (unit: rpm) of the motor 6. It should be noted that the rotational speed of the dewatering tank 4 during the dewatering operation is the same as the rotational speed of the motor 6.

Referring to FIG. 4, at the beginning of the dewatering operation, a dewatering preparation section, which is a preparation step for dewatering the laundry Q, is provided. The control unit 30 adjusts the positional relationship between the laundry Q in the dewatering tank 4 and the liquid in the balance ring 19 in the dewatering preparation period. After the dewatering preparation period, the control unit 30 starts rotation of the motor 6 for dewatering the laundry Q.

Specifically, after the dewatering preparation period, the controller 30 accelerates the speed of the motor 6 from 0 rpm to 120 rpm, that is, the first rotation speed, and then rotates the motor 6 stably at 120 rpm. The first rotational speed is higher than the rotational speed (for example, 50 rpm to 60 rpm) at which the dewatering tank 4 generates lateral resonance and the rotational speed at which the dewatering tank 4 generates longitudinal resonance (for example, 220 rpm). After stably rotating at 120 rpm, the controller 30 accelerates the rotational speed of the motor 6 from 120 rpm to 240 rpm, that is, the second rotational speed, and then rotates the motor 6 stably at 240 rpm. The second rotational speed is slightly higher than the speed at which the longitudinal resonance occurs. Then, the controller 30 accelerates the rotational speed of the motor 6 from 240 rpm to 800 rpm, that is, the target rotational speed, and then rotates the motor 6 stably at 800 rpm. Through the stable rotation of the motor 6 at 800 rpm, the laundry Q in the dewatering tank 4 is dewatered in earnest.

As described above, the control unit 30 has a first acceleration step for reaching 800 rpm from three steps, that is, from the start of rotation of the motor 6 to 120 rpm, a second acceleration step for reaching 240 rpm from 120 rpm, And accelerates the rotation of the motor 6 through the third acceleration step reaching 800 rpm. Unlike this case, if the motor 6 is accelerated from 0 rpm to 800 rpm at one time, a large amount of water is infiltrated from the laundry Q at one time, and the drainage state of the drainage passage 15 is deteriorated or the drainage passage 15 is filled with bubbles . However, in the present embodiment, since the motor 6 is stepwise accelerated so that a large amount of water does not escape from the laundry Q at one time, this problem can be prevented.

When the laundry Q in the dewatering tank 4 is in a state of being unevenly distributed and not uniformly distributed in the circumferential direction X of the dewatering tank 4 (Q) is shifted. If the dewatering operation is performed in this state, the dewatering vessel 4 is greatly shaken due to the eccentric rotation of the dewatering vessel 4, so that a large vibration is applied to the dewatering machine 1, and noise may be generated.

Therefore, the controller 30 detects whether the laundry Q in the dewatering tank 4 is shifted during the dewatering operation, and stops the motor 6 when it senses the deviation. The control unit 30 performs four types of electrical sensing, namely, sensing 1, sensing 2, sensing 3, and sensing 4 in this sensing mode. It should be noted that the mechanical sensing of the safety switch 36 (see Fig. 1) is carried out during the entire duration of the dewatering operation. It should be noted that the term "sensing" below refers to the operation of checking, and the term "detection "

Detection 1 is performed in the first acceleration phase. Detection 2 is performed in the second acceleration phase. Sense 3 and Sense 4 are executed in the third acceleration phase. More specifically, the sensing 1 to the sensing 3 are performed in the whole period of the corresponding acceleration step in the first to third acceleration steps, respectively, while the sensing 4 is executed in the middle of the third acceleration step. Thus, the dehydrator 1 accelerates the motor 6 through the three steps to prevent rotational speeds at which transverse resonance or longitudinal resonance can occur, i.e. slow dehydration at a rotational speed of 120 rpm and 240 rpm And monitors the rotation state of the dehydrating tank 4 through the sensing 1 through the sensing 4. In the following, preparation steps for dehydration, detection 1 to detection 4 will be described in order.

First, the dehydration preparation step will be described. 5 is a schematic view showing the inside of the dehydrating tank. 5 shows the inside of the dewatering tank 4 when observed along the direction of the central axis 17 of the dewatering tank 4. As shown in Fig. The dewatering tank 4 is provided with a forward position shifted toward the front (Y1) and an inner position shifted toward the rear (Y2). Since the center axis 17 is inclined forward (Y1) with respect to the up-and-down direction Z, the front position is located below the inner position Z2 (see Fig. 1). The liquid contained in the balance ring 19 in a state where the dehydration tank 4 is stopped and the dehydration tank 4 is rotated at a very low speed is not affected by the centrifugal force due to the rotation of the dehydration tank 4, In the balance ring 19 and biased in the downward direction Z2.

When the laundry Q is shifted in the circumferential direction X and disposed in the dewatering tank 4, the laundry Q is moved downward (Z2) in the balance ring 19 when the dewatering tank 4 starts rotating, It is preferable that the liquid displaced to the front position of the center axis 17 is located at an inner position opposite to the center axis 17. In this state, since the rotation of the dehydrator 4 starts in a state where the laundry Q and the liquid in the balance ring 19 are approximately balanced, eccentric rotation of the dehydrator 4 can be suppressed from the beginning of rotation.

Conversely, in the dehydrator 4, the laundry Q is shifted downward (Z2) so that the liquid disposed in the balance ring 19 and the dehydrator 4 are disposed at the same position in the circumferential direction X . In this state, when the dehydrator 4 starts to rotate to dehydrate the laundry Q, the dehydrator 4 rotates eccentrically from the beginning of rotation.

6 is a time chart showing the state of the rotation speed of the motor 6 in the dewatering operation preparation step. In the time chart of Fig. 6, the horizontal axis represents the elapsed time and the vertical axis represents the rotational speed (unit: rpm) of the motor 6. In the preparation stage, the dehydration tank 4 rotates stably at extremely low speed. It should be noted that the rotation speed of the motor 6 at this time is lower than the minimum rotation speed at which the dewatering tank 4 can cause resonance. The minimum rotation speed varies depending on the size of the dewatering tank 4, but in the present embodiment, the dewatering tank 4 has a rotation speed at which lateral resonance can occur, that is, the above-described 50 rpm to 60 rpm. In this case, for example, in the preparation step, the rotation speed of the motor 6 is 10 rpm to 30 rpm, preferably 20 rpm.

When the laundry Q is staggered in the circumferential direction X in the dewatering tank 4, if the dewatering tank 4 is stably rotated at a very low speed, the speed of the motor 6 changes as shown in FIG. Specifically, when the laundry Q is moved from the front position to the inner position, the laundry Q moves upward (Z1), so that the rotational speed of the motor 6 is lowered due to the load on the motor 6. Conversely, when the vehicle moves from the inside position to the front position, the rotational load of the motor 6 rises because the previous burden is reduced. Accordingly, when the rotational speed of the motor 6 is the highest, the laundry Q is in the front position, and when the rotational speed of the motor 6 is the lowest, the laundry Q is in the inward position. By rotating the dewatering tank 4 at a very low speed in this way, the laundry Q in the dehydrating tank 4 can be detected in the circumferential direction X according to the rotation speed of the motor 6.

7 is a flow chart showing the control operation in the dewatering operation preparation step.

According to the above description, the control unit 30 starts the extremely low-speed rotation of the motor 6 in the preparatory step of dewatering, and rotates the dewatering tank 4 at extremely low speed (step S1). It should be noted that if the laundry Q is rinsed in the outer tank 3 and the dewatering tank 4 before the dewatering operation and the drainage is proceeded, Lt; / RTI &gt; The control unit 30 senses the position of the laundry Q in the dehydrator 4 in real time in accordance with the output result of the rotational speed reading unit 37 in the state in which the motor 6 rotates at a very low speed ). Then, the control unit 30 stops the rotation of the dewatering unit 4 (step S3) by braking immediately before the laundry Q reaches the inner position according to the sensed position.

The rotation of the dewatering tank 4 is stopped when the laundry Q shifted in the dewatering tank 4 is positioned on the opposite side of the liquid in the balance ring 19 with the center axis 17 therebetween So that the dewatering tank 4 can be rotated by the inertia so that the laundry Q can come to the same side as the liquid in the balance ring 19.

On the other hand, the control unit 30 determines that the laundry Q shifted in the dewatering tank 4 is positioned on the opposite side of the liquid shifted downward (Z2) in the balance ring 19 with the central axis 17 therebetween The rotation of the dewatering tank 4 is stopped immediately before the operation. Therefore, the laundry Q shifted in the dewatering tank 4 and the liquid shifted downward (Z2) in the balance ring 19 after being stopped are placed on the substantially opposite side with the central axis 17 therebetween . In addition, since the dewatering tank 4 is supported so as to be rotated in only one direction through a one-way bearing, the dewatering tank 4 after the stop can not be reversed and is in a stopped state. When the dewatering tank 4 is rotated for dewatering after this preparation step, the dewatering tank 4 rotates in a state where the liquid in the balance ring 19 and the laundry Q are approximately balanced. As a result, eccentric rotation of the dewatering tank 4 arranged at an angle can be initially suppressed.

The first acceleration step after elapse of the next dehydration preparation period will be described. It should be noted that, after the first acceleration step, the liquid in the balance ring 19 does not shift downward (Z2) under the action of the centrifugal force, so that the liquid hardly causes eccentric rotation of the dehydrating tank 4.

8 is a flowchart showing the control operation of the first acceleration step. Referring to FIG. 8, after the dewatering preparation period has elapsed, the control unit 30 starts accelerating the motor 6 at 120 rpm to start the dewatering operation (step S11). When the interrupt W is input (YES in step S12), the control unit 30 adds 1 to the count value n whose initial value is 0 (+1) (step S13). Next, in the first acceleration step, the controller 30 starts sensing 1 (step S14). If the control unit 30 determines that the laundry Q has not been shifted, the control unit 30 ends the detection 1 (step S16: YES) YES "), the count value n is reset to 0 (step S17). Next, when the rotational speed of the motor 6 reaches 120 rpm (YES in step S18), the control section 30 causes the motor 6 to rotate stably at 120 rpm (step S19).

9A and 9B are flowcharts showing the control operation for sensing 1. Referring to FIG. 9A, the control unit 30 starts sensing 1 at step S14 and acquires a timer value A _n when an interrupt W is input ("YES" at step S21) Step S22). Timer value in the following abbreviated to A _n to A _n. A _n is an interval (I) (see FIG. 3) between the inputted interrupt W and the immediately preceding interrupt (W) and is a positive value measured by the timer 33. If there is no interrupt (W) immediately before, A _n is the interval (I) from the start of sense 1 to the first interrupt (W). It is to be described, the interrupt (W) is, so to add one when the input at the same time, the count value to obtain the A _n n (the above-described step S13), ending the alphabet of A _n "n" is the count value after the sum of the first n . Thus, for example, when the first interrupt (W) is input, the count value n becomes 1 and A _n becomes A ₁ . When the next interrupt (W) is inputted, the count value n becomes 2, and A _n becomes A ₂ .

Next, the control unit 30 calculates the moving average value B _n of A _n (step S23). The moving average value B _n can be abbreviated as B _n below. B _n is a value obtained by dividing the sum of A _n and A _n-1 to A _n-5 immediately before by 6. 6 is to combine the case where there are six interrupts W within the period R from when the pulse P is lost to the next pulse P is generated and then disappear again (see FIG. 3) .

Next, the control unit 30 calculates the moving average value C _n of B _n (step S24). The moving average value C _n can be abbreviated as C _n below. C _n is a value obtained by dividing the sum of B _n and B _n-1 to B _n-5 immediately before by 6.

The control unit 30 adds 1 to the count value n in step S13 (see Fig. 8) when the motor W accelerates to the target rotation speed, and if there is an interrupt W every time the motor 6 accelerates to the target rotation speed, _n . So adding 1 to the count value n and getting C _n actually goes in synchronism. That is, each time the control unit 30 obtains C _n , it adds 1 to the count value n.

According to experience, the count value n is the count value obtained by A _n ~ C _n does not stabilize before until it reaches the predetermined start value ( "No" in step S25), that n is not suitable for use in detection 1 not. In the present embodiment, for example, the starting value is 75. [ When the count value n has reached the starting value (at step S25 "Yes"), the control section 30 calculates the difference D _n recall is obtained by subtracting the C _n-1 in the immediately preceding _n C (step S26). Next, the control section 30 calculates the moving average value E _n recall the difference D _n (step S27). The moving average value E _n is a value obtained by dividing the sum of the difference D _n and the difference D _n-1 to the difference D _n-5 immediately before by 6. Abbreviated as the difference D _n to D _n in the following abbreviated and the moving average value E _n to E _n.

For each of the meanings of D _n and _{E n, C 11 (= (} B 6 + B 7 + B 8 + B 9 + B 10 + B 11) / 6) and _{C 17 (= (B 12 +} B 13 + B ₁₄ + B ₁₅ + B ₁₆ + B ₁₇ ) / 6). C ₁₇ and the count value n E ₁₇ which matches the D ₁₂ ~ D and the value of ₁₇ obtained by dividing by 6, if indicated by C _n the same as the equation (1) below, Equation (2) below, if indicated by B _n .

E ₁₇ = (D ₁₂ + D ₁₃ + D ₁₄ + D ₁₅ + D ₁₆ + D ₁₇ ) / 6

= C ₁₂ -C ₁₁ + C ₁₃ -C ₁₂ + C ₁₄ -C ₁₃ + C ₁₅ -C ₁₄ + C ₁₆ -C ₁₅ + C ₁₇ -C ₁₆ ) / 6

= (C ₁₇ -C ₁₁ ) / 6 Formula (1)

_{E 17 = ((B 12 +} B 13 + B 14 + B 15 + B 16 + B 17) - (B 6 + B 7 + B 8 + B 9 + B 10 + B 11)) / 36 ... formula (2)

As described above, in the one Hall IC 40, three Hall ICs 40 are provided with six (6) in total in the period R from when the pulse P is destroyed to when the next pulse P is generated and then disappear again There are two interrupts W (see FIG. 3). The mounting error of the Hall IC 40 can be solved through B _n . In Equation (2), E _n is a sum of B _n to B _{n + 5} for six interrupts (W) generated when an arbitrary NS group passes through one Hall IC 40, Corresponds to the difference in the _{sum of} B _{n + 6} to B _{n + 11} with respect to the six interrupts (W) generated when the group passes through the Hall IC 40. E _n calculated using a plurality of B _n can substantially eliminate the error of the relative position of the adjacent NS group.

FIG. 10 is a diagram showing the relationship between the count value n and C _n , in which the horizontal axis represents the count value n and the vertical axis represents C _n . 10, with the increase of the rotational speed of the acceleration of the motor (6) A _n is but small, the change in A _n by the mounting error of the NS-like mounting error and each Hall IC (40) is up crosstalk Actual A _n increases or decreases as indicated by the dotted line. B _n obtained by eliminating the mounting error of each Hall IC 40 can be obtained through the moving average in step S23 and C _n from which the noise of B _n is removed through the moving average in step S24 is obtained. Gained from the following D _n C _n, obtained from the E _n D _n. These A _n , B _n , C _n , D _n and E _n are information values concerning the rotational state of the motor 6.

If the laundry (Q) is not being shifted unless the dewatering tank 4 rotates eccentrically as indicated by C _n is the solid line in FIG. 10, the rotational speed increase of the motor 6 (see point dotted line arrow) . On the other hand, the moving average value A _n is the B _n, B _n is the moving average value, so C _n A _n and B _n will be reduced with the increase in the rotational speed of, but the noise, the motor 6 respectively.

If the dewatering tank 4, the case that the rotation is not eccentric, C _n is is reduced throughout, the difference obtained by subtracting the C _n-1 immediately before the in C _n D _n is less than or equal to 0 in the acceleration process of the motor (6), D _n moving average values of E _n is also below zero. Referring to Fig. 9B, E _n is 0 or less (NO in step S28 "Yes"), the control section 30 causes the variable F _n to zero (step S29). On the other hand, C _{n, which} is to be reduced when the dewatering tank 4 is eccentrically rotated due to the laundry Q in the dewatering tank 4, may fluctuate and rise as the rotational speed of the motor 6 rises. In this case, the C _n is set to D _n or E _n is greater than 0 ( "NO" in step S28), the controller 30 is a variable F when _n is increased to _n E itself (step S30).

When obtaining the F _n every time, the control unit 30 calculates the integrated value G (= F ₁ -F ₂ + ...) of F _n (step S31). G integrated value C _n is also the accumulated value of the moving average value E _n of the difference D _n of C _n and C _n-1 if _n is greater than the _C-1 of the immediately preceding.

11 is a graph showing the relationship between the count value n and the integrated value G, in which the horizontal axis represents the count value n and the vertical axis represents the integrated value G. When the motor 6 accelerates in a state in which the eccentric rotation of the dehydration tank 4 continues, the integrated value G increases stepwise as shown in Fig. In the cumulative value G, a first threshold value is determined for each predetermined count value n, and this first threshold value is stored in the memory 32 (see Fig. 2) in association with the count value n. The first threshold value is a positive value.

9B, when the integrated value G when the count value n is a predetermined value reaches the first threshold value when the count value n is a predetermined value (YES in step S32), the control section 30 outputs the detection result NG ", and it is determined that the eccentricity in the dehydration tank 4 is relatively large and the laundry Q is shifted (step S33).

On the other hand, if the integrated value G is smaller than the corresponding first threshold value (NO in step S32), the control unit 30 sets the detection result to OK and determines that the laundry Q is not shifted (step S34) . Next, until the count value n becomes the end value indicating the end of the first acceleration step ("NO" in step S35), the control section 30 repeats the processing of steps S21 to S34. In this embodiment, for example, the end value of the count value n is 245. When the count value n becomes the corresponding end value (YES in step S35), the control unit 30 ends the detection 1 (step S36). The processing in steps S21 to S34 corresponds to the processing in step S15 described above, and the processing in steps S35 and S36 corresponds to the processing in step S16 described above (see FIG. 8).

12 is a flowchart showing the control operation in the case where the detection result is NG. Referring to FIG. 12, when the control unit 30 determines that the detection result is NG, the control unit 30 stops the rotation of the motor 6, that is, the rotation of the dehydrating tank 4 (step S41). This makes it possible to suppress the eccentric rotation of the dewatering tank 4 at an early stage in the acceleration state of the motor 6 when the laundry Q in the dewatering tank 4 is shifted.

In particular, prior to the calculation of the integrated value G, the control unit 30 corrects the basis of calculation of the integrated value G, i.e., A _n by moving averaging several times in steps S23 and S24. Therefore, C _n obtained as a result of the correction becomes a high-accuracy value from which the error is eliminated. Accordingly, the integrated value G with high accuracy is calculated according to the corrected C _n , and the eccentric rotation of the dehydrator 4 is detected at the initial stage by detecting the deviation of the laundry Q with high accuracy by the integrated value G, .

After the rotation of the dewatering tank 4 is stopped, the control unit 30 determines whether the state at this time is before the dewatering operation is restarted (step S42). The dewatering operation restarting is a restarting process in which the control unit 30 stops rotation of the dewatering tank 4 to stop the dewatering operation and immediately starts rotating the dewatering tank 4 again to start the dewatering operation. The restarting process can be performed even when the deviation of the laundry Q is small.

In the case before the restart without executing the restart processing (YES in step S42), the control unit 30 executes the restart processing (step S43). It should be explained that the drainage in the outer tub 3 can be advanced before the restarting process. When the bubble blocks the drainage passage 15, the bubble can be discharged out of the drainage passage 15 through the drainage mentioned above, so that the case where the bubble blocks the drainage passage 15 can be solved.

If it is not the state before the restart ("NO" in step S42), the control section 30 executes the correction processing (step S44). The control unit 30 closes the drain valve 16 and then opens the water supply valve 14 to supply water to a predetermined water level in the dewatering tank 4 so that the laundry Q in the dewatering tank 4 is supplied to the water It is easy to get wet and loose. In this state, the control unit 30 rotates the dewatering tank 4 and the rotary vane 5 so that the laundry Q attached to the inner peripheral surface of the dewatering tank 4 is dropped and stirred, (Q).

In this way, after the rotation of the dewatering tank 4 is stopped, the control unit 30 selects and executes one of the restarting process and the correction process. If the deviation of the laundry Q is small enough to prevent eccentric rotation of the dewatering tank 4 from occurring, the dewatering is started again through the restarting process, so that the time required for the entire dewatering process can be shortened as much as possible. It is possible to reliably correct the deviation of the laundry Q through the correction process when the deviation of the laundry Q is large enough to enable the dehydrating tub 4 to eccentrically rotate again in the next dehydration process.

When the rotation of the dehydrating tank 4 is stopped after the predetermined number of times (here, once) of the restarting process is executed ("No" in step S42), the control unit 30 does not select the restarting process (Step S44). That is, when the rotation of the dewatering tank 4 is stopped after the restarting process is performed a predetermined number of times, the deviation of the laundry Q is large enough to be corrected. In this case, it is not wasted time for stopping the rotation of the restarting process and the dewatering tank 4 after that, but correcting the deviation surely by executing the correction process quickly. Thus, eccentric rotation of the dewatering tank 4 can be initially suppressed. It should be noted that although the predetermined number of times is set to one in the present embodiment, it may be set to two or more times.

Next, the second acceleration step after the stable rotation at 120 rpm is completed will be described. 13 is a flowchart showing the control operation in the third acceleration step. Referring to Fig. 13, the control unit 30 starts acceleration of the motor 6 aiming at 240 rpm in the second acceleration step (step S51). If the interruption W is input every time (YES in step S52), the control unit 30 adds 1 to the count value n (step S53). It should be noted that the count value n at the beginning of the second acceleration phase is zero.

Next, in the second acceleration step, the control unit 30 starts detection 2 (step S54). If the detection unit 2 is OK (YES in step S55), that is, if the control unit 30 determines that the laundry Q has not shifted in the second acceleration step, the control unit 30 ends the detection 2 Quot; YES "in step S57), the count value n is reset to zero (step S57). Next, when the rotational speed of the motor 6 reaches 240 rpm (YES in step S58), the control section 30 causes the motor 6 to rotate stably at 240 rpm (step S59).

The contents of detection 2 are identical to those of detection 1. Therefore, the processing of steps S21 to S34 described above corresponds to the processing of step S55, and the processing of steps S35 and S36 described above corresponds to the processing of step S56 (see FIG. 9B). Here, the first threshold value of the detection 2 is set different from the first threshold value of the detection 1. Since the rotation speed of the motor 6 is higher than that of the detection 1 in the detection 2, the starting value of the step S25 (see FIG. 9A) corresponding to the detection 1 is smaller than the starting value of the detection 1, to be. If the detection result of the detection 2 is NG ("NO" in the step S55), that is, if the controller 30 determines that the laundry Q has shifted in the dehydration tank 4, The process of steps S41 to S44 is executed similarly (see Fig. 12).

It should be noted that in the dewatering operation of the restarting process after detection 2, the time for stable rotation at 120 rpm is shortened to a time shorter than the time for stable rotation at 120 rpm in the dehydration operation stopped immediately before (see Fig. 4) can do. In the restarting process, since the laundry Q is adhered to the inner peripheral surface of the dewatering tank 4 in a state in which the water is dehydrated to some extent, the stable rotation time at 120 rpm can be shortened. As a result, the time for dewatering operation can be shortened.

Next, the third acceleration step after stable rotation at 240 rpm will be described. 14 is a flowchart showing the control operation in the third acceleration step. Referring to Fig. 14, the control unit 30 starts accelerating the motor 6 at 800 rpm in the third acceleration step (step S61). When the interruption W is input every time (YES in step S62), the control unit 30 adds 1 to the count value n (step S63). In addition, the count value n at the start of the third acceleration phase is zero.

In the third acceleration step, the controller 30 starts detection 3 (step S64). Next, when the detection 3 is OK (YES in step S65), that is, when the control unit 30 determines that the laundry Q has not been shifted and the rotational speed of the motor 6 reaches 800 rpm (step S66 , The control unit 30 terminates the detection 3 and resets the count value n to 0, thereby stably rotating the motor 6 at 800 rpm to continue dehydration (step S67).

The contents of detection 3 are almost the same as the contents of detection 1 and detection 2, respectively. Therefore, the processing of steps S21 to S34 described above corresponds to the processing of step S65 (see Figs. 9A and 9B). Wherein the first threshold value of the detection 3 is set to be different from the first threshold value of each of the detection 1 and the detection 2. It should be noted that the start value of the detection triple step S25 (see FIG. 9A) is the same as the start value of the detection 2. If the detection result of the detection 3 is NG (NO in step S65), that is, if the controller 30 determines that the laundry Q has shifted in the dehydrator 4, as with the detection 1 and the detection 2, The control unit 30 executes the processes of steps S41 to S44 (see Fig. 12).

It should be noted that, as described in the second embodiment, in the dewatering operation restarted after the detection 3, the rotation time can be stabilized at 120 rpm, and the rotation time can be shortened more than the time of stable rotation at 120 rpm in the dewatering operation stopped immediately before. In step S21, until the rotational speed of the motor 6 reaches 800 rpm even after n reaches the end value of the step S35 (see Fig. 9B) in the detection 3, unlike the detection 1 and the detection 2, The process of S34 is repeated. At the beginning of repeating the process, each value of n and A _n to G is reset to zero.

As described above, the control unit 30 obtains information values such as A _n to E _n , respectively, in the detection 1 of the first acceleration phase, the detection 2 of the second acceleration phase and the detection 3 of the third acceleration phase, respectively, 1 &quot; to &lt; / RTI &gt; When the integrated value G reaches the corresponding first threshold value, the controller 30 determines that the laundry Q has shifted in the dehydrator 4 and stops rotating the dehydrator 4. That is, since the detection of whether or not the laundry Q is shifted is made from the first acceleration step after the motor 6 starts to rotate, eccentric rotation of the dewatering tank 4 can be initially suppressed. Since the detection of the deviation of the laundry Q is performed in three steps in the order of the first acceleration step, the second acceleration step and the third acceleration step, the deviation of the laundry Q can be reliably detected, Eccentric rotation of the bath 4 can be suppressed as early as possible.

In the detection 3, as described above, the control unit 30 detects the first mode of detecting whether or not the laundry Q in the dehydrating tank 4 is deviated by whether or not the integrated value G itself reaches the first threshold value . The controller 30 can detect the second mode of detecting whether the laundry Q is shifted according to whether the change amount of the integrated value G reaches the third threshold value without performing the detection of the first mode. The third threshold value is preset to be equal to the first threshold value and is stored in the memory 32 (see FIG. 2). The third threshold is a positive value. In the state where the rotational speed of the motor 6 is raised to some extent, for example, 400 rpm, as in the third acceleration step, the laundry Q is removed from the laundry by the previous dehydration, Q of the dewatering tank 4 is deteriorated and the vibration of the dewatering tank 4 can be increased. On the other hand, as the characteristic of the integrated value G, the integrated value G sharply rises in a state where the rotational speed of the motor 6 is low, but does not rise as the rotational speed approaches the target speed.

Therefore, regardless of the magnitude of the vibration of the dehydrator 4, the integrated value G itself is in a state lower than the first threshold value in the state in which the rotational speed has increased to some extent only for the detection of the first mode, It may be difficult to stop the rotation of the motor. Therefore, detection of the first mode and detection of the second mode can be executed in duplicate. In the detection of the second mode, when the change amount of the integrated value G, that is, the variation width of the integrated value G reaches the third threshold value, the controller 30 determines that the laundry Q has shifted, Stop. Thus, even in a situation where the integrated value G does not reach the first threshold value regardless of whether or not the dehydrator 4 is largely vibrated, the change of the state of the laundry Q The eccentric rotation of the dewatering tank 4 can be reliably suppressed at an early stage. Of course, the detection of the second mode can be performed not only in detection 3 but also in detection 1 and detection 2.

The following describes sensing 4 that is performed with sense 3 in the third acceleration phase. Detection 4 consists of detection 4-1 and detection 4-2. Detection 1 to detection 3 are used to detect whether the laundry Q is deviated by using an interrupt W associated with the motor 6 in the acceleration state, To detect whether or not the laundry Q is shifted. 15 is a flowchart showing the outline of the detection 4-1 and the detection 4-2.

Referring to Fig. 15, the control unit 30 starts to accelerate the motor 6 so that the rotational speed becomes 240 rpm to 800 rpm as the third acceleration step in the above-described step S61 (see Fig. 14).

When the rotational speed of the motor 6 reaches 300 rpm in a state in which the motor 6 is accelerated, the control unit 30 obtains the duty ratio of the voltage applied to the motor 6 at that point and sets the value to? ). 300 rpm is not a rotational speed in a state where water is stored in the dehydrating tank 4 but a rotational speed in a state in which the effect of the eccentricity of the dehydrating tank 4 is unimpeded. Therefore, the value of? At 300 rpm is the duty ratio in a state in which the effect of the eccentricity of the dehydrator 4 is not affected at all and is only influenced by the load Q of laundry.

Further, in a state in which the motor 6 continues to be accelerated, the control section 30 performs the detection 4-1 in a period in which the rotational speed is changed from 600 rpm to 729 rpm (step S72). If the detection unit 4-1 is not OK (NO in step S72), that is, if the control unit 30 determines that the laundry Q has shifted, the control unit 30 proceeds to step S41- S44 (see Fig. 12). It should be noted that, as described in the detection 2 and the detection 3, in the dehydration operation after restarting after the detection 4-1, the time to stably rotate at 120 rpm in the dehydration operation stopped immediately before the stable rotation time at 120 rpm Can be reduced.

On the other hand, when the detection 4-1 is OK (YES in step S72), that is, when the controller 30 determines that the laundry Q is not shifted in the detection 4-1, 6) continues to be accelerated from 730 rpm, the detection 4-2 is carried out continuously (step S77).

If the control unit 30 determines that the laundry Q has not been shifted in the detection 4-2, the control unit 30 determines that the laundry Q is not shifted. If the detection 4-2 is OK (YES in step S77) And then the motor 6 is stably rotated at 800 rpm to continuously dehydrate the laundry Q (step S78).

 On the other hand, when the detection unit 4-2 is not OK (NO in step S77), that is, when the control unit 30 determines that the laundry Q has shifted, the control unit 30 controls the motor 30 to rotate at a rotational speed of less than 800 rpm, The laundry 6 is stably rotated to dehydrate the laundry Q (step S79).

Next, the detection 4-1 and the detection 4-2 will be described in detail.

16 is a flowchart showing a control operation for the detection 4-1. 16, in a state in which the motor 6 continues to be accelerated after passing through step S71 (see Fig. 15), the control section 30 determines that the rotation speed of the motor 6 reaches 600 rpm, (Step S80).

Next, the control unit 30 starts counting through the counter 34 (step S81). When 0.3 seconds elapses, the counter 34 initializes the counter 34 every 0.3 seconds (steps S82 and S83).

The control unit 30 is the rotational speed, the duty ratio d _m of the voltage applied to the motor 6, the motor 6 of the count process, each time the count each time: Get a (m count value) (step S84). That is, the control unit 30 obtains the rotational speed and the duty ratio d _m of the motor 6 every predetermined time in the third acceleration step in which the rotational speed of the motor 6 reaches 800 rpm from 240 rpm. The duty ratio d _m is an information value related to the rotational state of the motor 6.

In addition, in step S84, the controller 30 calculates a correction value B _m obtained by correcting the duty ratio d _m with an alpha value according to the following equation (3). It should be noted that X and Y in equation (3) are constants obtained through experiments and the like. Simple proportional calculation, unlike, the 4-1 detection by the formula (3), the correction value B _m is obtained by changing the weight compensation of the duty ratio d by _m can be precisely executed.

B _m = d _m - (? X + Y)

In addition, in step S84, the control unit 30 calculates the movement cumulative value C _m (m: count value) of the correction value B _m . The movement cumulative value C _m is a sum of five consecutive correction values B _m that are continuous along the counting line. On the other hand, in the random movement of the accumulated value C _m and the immediately preceding movement of the accumulated value C _{m- 1,} the mobile integrated value of the correction value C 5 constituting the _m-1 B _m B _m of the back of the four correction values and the accumulated movement value of the correction value C 5 constituting the _m B _m B _m in front of the four correction values are the same values, respectively. It should be noted that the total number of correction values B _m to compose the movement cumulative value C _m is not limited to the above-mentioned five. The movement cumulative value C _m is a predetermined index value converted from the duty ratio d _m through the control unit 30.

Next, the control unit 30 calculates a second threshold value regarding the movement cumulative value C _m according to the following equation (4) (step S85). The second threshold value is a positive value.

Second threshold = (rotation speed) x a + b (4)

In Equation (4), a and b are constants obtained by experiments or the like, and are stored in the memory 32. These constants a and b are different according to the rotation speed of the motor 6 at the current moment and the selected dehydration condition. Therefore, the second threshold value here has a plurality of values at the same rotation speed. It should be noted that the second threshold value is a value not influenced by the above-mentioned? Value, and this case becomes more apparent by the equation (4).

Next, the control unit 30 checks whether the rotational speed of the motor 6 at the current time is less than 730 rpm (step S86).

If the rotational speed of the motor 6 is less than 730 rpm at the present time (YES in step S86), the control unit 30 determines whether the latest movement cumulative value C _m falls within the range of the detection 4-1 (step S87) .

17 is a graph showing the relationship between the rotation speed and the movement cumulative value C _m by combining the detection 4-1 and the detection 4-2. In Fig. 17, the horizontal axis represents the rotation speed (unit: rpm), and the vertical axis represents the movement cumulative value C _m . Referring to FIG. 17, the second threshold value calculated in step S85 may be calculated based on, for example, two types of threshold values according to the dynamics of the dehydration condition, that is, an upper second threshold value indicated by a one- And is set to the lower second threshold value. The upper second threshold value is higher than the lower second threshold value. The upper second threshold value and the lower second threshold value are changed according to the rotation speed, respectively.

The dewatering condition includes a dewatering condition in which a dewatering operation is performed after "water rinse" in which the laundry Q is rinsed through water stored in the dewatering tank 4; "Shower dehydration" in which dehydration is carried out while water is being sprayed on the laundry (Q) while dehydrating; And dehydration conditions such as the above-mentioned "restart process ". The user selects this dehydration condition through an operation on the operation unit 10 and the selection is accepted to the control unit 30. [ Since a large amount of water is contained in the laundry Q in the dewatering operation after the washing operation after the water rinsing, the acceleration of the motor 6 requires a lot of force. However, in the case of the shower dewatering and the restarting treatment, Since the water is removed, the acceleration of the motor 6 can be realized by a very small force.

The upper second threshold value higher than the lower second threshold value is used because the detection is relatively difficult if the control unit 30 uses the lower second threshold value in the dewatering operation after washing operation after washing operation. On the other hand, when the upper second threshold value is used in the dewatering operation of the shower dewatering and the restarting process, the detection may not be accurate, so that the controller 30 uses the lower second threshold value lower than the upper second threshold value. Therefore, whether the laundry Q includes a large amount of water or a certain amount of water removed from the laundry Q, the detection 4-1 is performed using a second threshold suitable for each situation.

If the load of the laundry Q in the dewatering tank 4 is large and the control unit 30 uses the lower second threshold value in the detection 4-1 according to the same purpose as the difference in the dehydration condition, The control unit 30 uses the upper second threshold value higher than the lower second threshold value. If the load of the laundry Q in the dehydration tank 4 is small, the control unit 30 may not be accurate if the upper second threshold value is used in the detection 4-1, And uses the lower second threshold value lower than the threshold value. Therefore, when the loads of the laundry Q are different, the detection 4-1 is executed using the second threshold suitable for each.

Although the two second threshold values, that is, the upper second threshold value and the lower second threshold value are illustrated in FIG. 17, the second threshold value may be set to three or more according to various dehydration conditions and loads have.

In addition, when the laundry Q is relatively large due to the large eccentricity (see the dotted line in Fig. 17), compared with the case where the eccentricity is small and the laundry Q is not shifted The integrated value C _m becomes large. If the deviation of the laundry Q is large, the movement cumulative value C _m is larger than a corresponding one of the set second threshold values, that is, the upper second threshold value and the lower second threshold value.

16, when the latest movement cumulative value C _m reaches the second threshold value at the corresponding time point, the controller 30 determines that the laundry Q has shifted within the dehydrator 4, It is determined that the value C _m falls within the range of the detection 4-1 (YES in step S87).

If the control unit 30 determines that the movement cumulative value C _m is within the range of the detection 4-1 (YES in step S87), the control unit 30 executes the processes of steps S41 to S44 (see Fig. 12). The processing of steps S80 to S87 is included in the above-described step S72 (see Fig. 15).

Next, when the rotational speed of the motor 6 reaches 730 rpm ("NO" in step S86) in a state where it is determined that the laundry Q has not shifted in the detection 4-1, the control unit 30 sets the detection 4-1 And ends the detection 4-2 (step S88).

18 is a flowchart showing the control operation for the detection 4-2. Referring to FIG. 18, as the rotational speed of the motor 6 reaches 730 rpm in a state where the motor 6 continues to be accelerated, the control section 30 starts the detection 4-2 (step S88 described above).

Next, the control unit 30 starts counting through the counter 34 (step S89). When 0.3 seconds elapses, the counter 34 initializes the counter 34 every 0.3 seconds (steps S90 and S91).

Detection 4-1 Like in step S84, the control section 30 every time when the count gets to a duty ratio d _m of the voltage applied to the rotational speed and the motor 6, the motor 6 at the time of counting, the correction value B _m And the movement cumulative value C _m are calculated (step S92).

Next, the control unit 30 calculates a second threshold value related to the movement cumulative value C _m according to the above-described equation (4) (step S93). The constants a and b constituting the equation (4) are different depending on the rotational speed of the motor 6 at the current time and the selected dehydrating condition as in the case of the detection 4-1. Therefore, the second threshold value here is a plurality of values such as the above-described upper second threshold value and lower second threshold value at the same rotation speed.

Next, the control unit 30 confirms whether or not the rotational speed of the motor 6 at the current time has reached the target rotational speed of 800 rpm (step S94).

The current when the rotation speed of the motor (6) of the time has reached the target rotational speed as in the control unit 30 detects 4-1 (step S87) ( "YES" in step S94), the latest move the accumulated value C _m It is judged whether it belongs to the range of the detection 4-2 (step S95).

17, when the eccentricity is small and the laundry Q is not shifted (refer to a solid line) when the eccentricity is relatively large and the laundry Q is shifted (see the dotted line in FIG. 17) The movement cumulative value C _m of each rotational speed becomes larger. If the deviation of the laundry Q is large, the movement cumulative value C _m is larger than the corresponding one of the set second threshold values, that is, the upper second threshold value and the lower second threshold value.

18, when the latest movement cumulative value C _m is greater than the set second threshold value, the control unit 30 determines that the laundry Q has shifted within the dehydrator 4 and the movement cumulative value C _m is within the range of the detection 4-2 (YES in step S95).

When the control unit 30 determines that the movement cumulative value C _m belongs to the detection 4-2 (YES in step S95), the control unit 30 determines that the laundry Q The rotational speed L of the motor 6 is obtained (step S96).

Next, the control unit 30 stably rotates the motor 6 at a rotation speed obtained after the acquired rotation speed L, exactly, the number of digits at the rotation speed L, and then dehydrates the laundry Q Described step S79). At this time, the control unit 30 extends the dehydration time at the rotation speed L to obtain a dewatering effect as in dehydration at the original target rotation speed of 800 rpm.

Next, when the rotational speed of the motor 6 reaches the target rotational speed in the state where it is determined that the laundry Q has not been shifted in the detection 4-2 ("NO" in step S94) And the motor 6 is stably rotated at 800 rpm to dehydrate the laundry Q (step S78 described above).

In this way, the 3rd whether laundry (Q) is shifted in the acceleration stage dewatering tank 4 has a mode that is sensed by the information value and the first threshold value, such as C _n 1 ~ detected 3, and the duty ratio d _m The eccentric rotation of the dewatering tank 4 can be surely suppressed at the beginning because it is double sensed through the mode using the second threshold value, i.e., the detection 4.

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

19 is a flowchart showing a first modification of the control operation for the sensing 3 in the third acceleration step. It should be noted that in the drawings including FIG. 19, the same process steps as those of the process steps of the other drawings are given the same step numbers, and a detailed description of the process steps is omitted. 19, the control unit 30 starts acceleration for the motor 6 at 800 rpm (step S61), and if there is input of the interrupt W every time (step S62 Quot; YES "), and adds 1 to the count value n (step S63). In the third acceleration step, the control unit 30 starts detection 3 (step S64). Next, when the subsequent rotational speed of the motor 6 reaches 800 rpm ("YES" in step S66), the control unit 30 determines that the control unit 30 has detected 3 is OK (YES in step S65) The detection 3 is terminated and the count value n is reset to 0, and the motor 6 is stably rotated at 800 rpm and dehydrated continuously (step S67).

In the first modified example, and it monitors the maximum value G _max of G in case of the rotational speed of 250 ~ 300rpm detected 3:00 controller 30 motor 6 (step S68). A predetermined reference value smaller than the first threshold value with respect to the maximum value G _max is set and stored in the memory 32. If the maximum value G _max does not exceed the reference value once (Yes in step S68), the control unit 30 uniformly increases the second threshold value used in the detection 4 (step S69).

That is, when the maximum value G _max of the detection 3 is less than the reference value, the dehydrator 4 is at least statically balanced. When the dehydration tank 4 is in a balanced state, both static and dynamic, the detection 3 and the detection 4 are all OK, but even if the detection 3 is OK in the state where the dynamic balance is broken, It is possible to sensitively sense the shaking in the longitudinal direction of the main body 4. Accordingly, in the case of detection 4 C _m receive the excessively large NG, As a result, the outer tub 3, and even greater vibration of the dewatering tank 4 in the sense 4, which is a bad situation in which rotation has stopped generation of the dewatering tank 4 &Lt; / RTI &gt;

If the maximum value G _max of the detection 3 is a value lower than the reference value (YES in step S68), the control unit 30 determines that the vibration of the outer tub 3 and the dehydrating tub 4 is large And controls to increase the second threshold value of the detection 4 in step S69. That is, the detection error of the detection 4 using the duty ratio d _m is prevented through the detection 3.

20 is a schematic view showing the inside of the dewatering tank 4 during the dewatering operation according to the second modification of the control operation for the detection 3; For example, as shown in Fig. 20 (a), the laundry Q in the dewatering tank 4 is divided into the first laundry Q1 and the second laundry Q2, with the central axis 17 of the dewatering tank 4 therebetween. Can be disposed in the dehydrator (4) in a state of being divided by the flow path (Q2). When the dehydrator 4 rotates at a high speed of 800 rpm in this state, the dehydrator 4, which was originally circular, is rotated by the centrifugal force so that the first laundry Q1 and the second laundry Q2 Is deformed into an elongated oval shape in the direction in which they face each other and can be brought into contact with the circumferential wall 3A of the outer tub 3. In order to prevent such a problem, in the third acceleration step, control for the detection 3 according to the second modification as shown in Fig. 21 can be performed.

21, the control unit 30 starts to accelerate the motor 6 at 800 rpm in the same manner as the above-described sensing 3 (step S61). When there is input of the interrupt W every time (step S62 Quot; YES "), 1 is added to the count value n (step S63). In the third acceleration step, the control unit 30 starts detection 3 (step S64). Next, when the detection 3 is OK (YES in step S65), the control unit 30 ends the detection 3 when the rotation speed of the motor 6 reaches 800 rpm (YES in step S66) n is reset to 0, and the motor 6 is stably rotated at 800 rpm to continue dehydration (step S67).

Sets a predetermined first reference value smaller than the first threshold value with respect to the maximum value G _max at the sensing 1, sets a predetermined second reference value smaller than the first reference value with respect to the maximum value G _max at the sensing 2, 3, a predetermined third reference value smaller than the second reference value is set with respect to the maximum value G _max when the rotational speed of the motor 6 is 250 to 300 rpm. The first to third reference values are stored in the memory 32.

In the detection 3 of the second modification, if the maximum value G _max in the previous detection 1 does not exceed the first reference value at all (YES in step S101) and the maximum value G _max in the previous detection 2 exceeds the second reference value once It did not (in step S102 "Yes"), unless the maximum value G _max in the case where the rotational speed of the motor 6 is in this sense 3 250 ~ 300rpm exceeds the third reference value once (in the step S103, "Yes" ), The controller 30 uniformly lowers the second threshold value of the detection 4 (step S104).

That is, if the maximum value G _max of each of the detections 1 to 3 is a small value below the corresponding reference value in any detection (YES in steps S101 to S103), the laundry Q in the dehydrator 4 It is in a state of being uniformly distributed in the dehydrating tank 4 or side by side as shown in Fig.

Therefore, if the maximum value G _max of each of the detections 1 to 3 is a smaller value than the reference value corresponding to any detection (YES in steps S101 to S103), the laundry Q in the dehydrator 4 Assuming that it is in the divided state, the control unit 30 lowers the second threshold value (step S104). Thus, before the dehydrator 4 is largely deformed into the elliptical shape in the detection 4 performed with the detection 3, the detection 4-2 is made NG in the step S95, and the dehydration tank 4 and the outer tank 3 The dehydration operation is continued at a rotational speed at which the dehydrating operation is not performed (see Fig. 18).

As described above, in Modification 1 and Modification 2, the controller 30 calculates the second threshold value _Gmax according to the maximum value Gmax of the integrated value G of at least one of the first acceleration step, the second acceleration step and the third acceleration step . Therefore, the eccentric rotation of the dewatering tank 4 can be initially suppressed by detecting the deviation of the laundry Q with high accuracy according to the second threshold value changed according to the situation of the dewatering tank 4. It should be noted that the control of Modification Example 1 and Modification Example 2 can be carried out together.

22 and 23 are flowcharts showing the control operation of the third modified example during the dewatering operation. As described above, the dehydrator 1 can sense the eccentric rotation of the dehydrator 4 electrically through the sensing 1 through the sensing 4, mechanically detect the eccentric rotation of the dehydrator 4 through the safety switch 36, It is possible to detect the eccentric rotation of the motor. In other words, the double mode senses whether or not the laundry Q is shifted through the electric mode and the mechanical mode, where the electric mode is a cumulative value G, which is an information value related to the rotation state of the motor 6 rotated to 800 rpm, _m and a first threshold value and a second threshold value, and the mechanical mode is a mode in which the safety switch 36 senses through contact with the outer tub 3. Therefore, the control unit 30 may control the washing operation of the washing machine in accordance with any one of the cases where it is determined that the laundry Q has shifted from the detection 1 to the detection 4 and the case where the safety switch 36 detects the eccentric rotation of the dewatering tank 4 The rotation of the dehydrating tank 4 is stopped.

Regardless of mechanical sensing and electrical sensing, it is desirable to sense eccentric rotation of the dewatering vessel 4 at the same time. However, there is a difference in the relative positions of the dewatering tank 4 and the safety switch 36 due to the inclination error between the dewatering vessels 4 of the dehydrators 1 in the dehydrator 1 in the shipping stage, The first threshold value and the second threshold value of some dehydrators 1 may not be suitable and a time difference may occur between mechanical sensing and electrical sensing. Therefore, when the dehydrator 1 is used, the first threshold value and the second threshold value can be corrected to eliminate this difference. The following describes the case of correcting the first threshold value of the detection 1, but it is not limited to the case of correcting the first threshold value of the detection 1 only, and the first threshold value in the detection 2 and the detection 4, It is also possible to correct the second threshold value.

Referring to Fig. 22, the control unit 30 starts the dehydration by rotating the dehydrating tank 4 at the start of the first dehydration operation after shipment (step S111). As dehydration begins, sensing 1 proceeds in the first acceleration phase. At this time, when the safety switch 36 is started and turned "ON" (YES in step S112), the control unit 30 sets the count value n at this time to n _x and sets the integrated value G at this time to G _x (Step S113). The first threshold value when the count value n is n _x is a value obtained by subtracting the first predetermined value from n _x in the embodiment. The first predetermined value is a positive value.

The control unit 30 determines whether the value obtained by subtracting G _x from the immediately preceding first threshold value is greater than or equal to the second predetermined value J (step S114). The second predetermined value J is a positive value. A first threshold value and if the difference between the G _x 2 or less than a predetermined value J (step S114 "No"), the sense 1 is a eccentric rotation and eccentric rotation detected by the safety switch 36 is detected is the time difference Since it is determined that the first threshold value is appropriate, the control section 30 continues to operate without changing the first threshold value (step S115).

First, the time difference between the threshold and if the difference G _x or more than the J second predetermined value (NO in step S114 "Yes"), the sense 1 is detected by the eccentric rotation with the eccentric rotation detected by the safety switch (36) It can be determined that the time when the eccentric rotation is detected through the sensing 1 is much later than the time when the eccentric rotation is sensed through the safety switch 36. [ However, since this difference may occur by chance, the control section 30 first adds 1 to the correction candidate value U at shipping 0 (step S116). The control unit 30 continues to operate without changing the first threshold value (step S118) when the correction candidate value U after adding 1 is smaller than the predetermined upper limit value (here, 3) (NO in step S117).

On the other hand, when the correction candidate value U after the addition of 1 reaches the upper limit value (YES in step S117), there is a clear difference between the eccentric rotation sensed by the sensing 1 and the eccentric rotation sensed through the safety switch 36 The first threshold value at this time is not valid. Accordingly, the control unit 30 changes the first threshold value by lowering the value obtained by subtracting the immediately preceding second predetermined value J from the first threshold value to a new first threshold value (step S119). Next, the control unit 30 resets the correction candidate value U to 0 (step S120) and continues to operate (step S121).

Thus, the safety switch 36 is integrated value G _x and the not less than the difference between the first threshold value predetermined ( "Yes" in step S114), the control section 30 at the time when sensing an eccentric rotation of the dewatering tank 4 The first threshold value is corrected (step S119). Thus, in detection 1 for dehydration after correcting the first threshold value. The eccentric rotation of the dewatering tank 4 can be initially suppressed by detecting the deviation of the laundry Q with high accuracy according to the corrected first threshold value.

23, if the safety switch 36 is not started (NO in step S112), if the integrated value G does not exceed the first threshold value (NO in step S131), the control unit 30 Does not change the correction candidate value V which is initially 0 (step S132), and continues to operate (step S133).

On the other hand, if the integrated value G reaches the first threshold value and the detection result of the detection 1 becomes NG (YES in step S131) while the safety switch 36 is not started (NO in step S112) , the control section 30 sets the count value n at this time by n _y, and sets the integrated value of G in case Gy. The first threshold value when the count value n is n _y is a value obtained by subtracting the above-mentioned first predetermined value from n _y in the present embodiment.

The control unit 30 determines whether G _y is greater than a value T obtained by adding the third predetermined value to the immediately preceding first threshold value (step S135). The third predetermined value is a positive value. If G _y is less than T (NO in step S135), there is little time difference between the eccentric rotation detected by the sensing 1 and the eccentric rotation detected through the safety switch 36, so that the first threshold value is appropriate The control unit 30 continues to operate without changing the first threshold value (step S136).

If G _y is greater than T (YES in step S 135), there is a time difference between the eccentric rotation detected by the sensing 1 and the eccentric rotation detected through the safety switch 36, and when sensing 1 detects eccentric rotation The time is much faster than through the safety switch 36. However, since this difference may occur by chance, the control section 30 first adds 1 to the correction candidate value V (step S137). The control unit 30 continues to operate without changing the first threshold value (step S139) if the correction candidate value V after adding 1 is smaller than the predetermined upper limit value (here, 3) (NO in step S138).

On the other hand, if the correction candidate value V after the addition of 1 reaches the upper limit value (YES in step S138), there is a clear time difference between the eccentric rotation sensed by the sensing 1 and the eccentric rotation sensed through the safety switch 36 Therefore, the first threshold value is not valid. Accordingly, the control unit 30 changes the first threshold value by widening the value obtained by adding the third predetermined value to the first threshold value to a new first threshold value (Step S140). Next, the control unit 30 resets the correction candidate value V to 0 (step S141) and continues to operate (step S142).

In this manner, when the safety switch 36 determines that the laundry Q has shifted (YES in step S131) before the safety switch 36 detects the eccentric rotation of the laundry Q, the control unit 30 corrects the first threshold value Step S140). Thus, in the detection 1 for dehydration after the correction of the first threshold value, the eccentric rotation of the dehydration tank 4 is detected by detecting the deviation of the laundry Q with high accuracy according to the first threshold value after correction Can be suppressed at an early stage. It should be noted that the modified example 3 can be combined with the other modified example 1 and the modified example 2.

Next, the fourth modified example will be described. The vibration of the dewatering tank 4 is not so large in relation to the safety switch 36 but the safety switch 36 can easily be expected to come into contact with the outer tub 3 in accordance with the mode of motion of the outer tank 3 have. In order to prevent rotation stop of the dewatering tank 4 due to the error detection of the mechanical mode, the control operation of the fourth modification proceeds together with the detection 1. The control operation of the fourth modification uses the first threshold value and the different threshold value (set to the fourth threshold value). The fourth threshold value may be the same value as the first threshold value, but is preferably a value lower than the first threshold value. The following description is based on the assumption that the fourth threshold value is slightly lower than the first threshold value.

24 is a flowchart showing the control operation of the fourth modification. Referring to FIG. 24, the control unit 30 starts dehydration by rotating the dehydrating tank 4 at the start of the dehydrating operation (step S151). As dehydration begins, detection 1 proceeds in the first acceleration phase. At this time, the safety switch 36 is in the startup when "on", the control unit 30 ( "Yes" in step S152) sets the integrated value of G in case G _z (step S153).

The controller 30 determines whether G _z is greater than or equal to the fourth threshold value (step S154). If G _z is 4 is more than the threshold (steps S154 "Yes"), via the visual and safety switch 36 is detected first is detected, the eccentric rotation time of detecting the eccentric rotation, so substantially matched, the safety switch The start of the safety switch 36, that is, the detection result through the safety switch 36 is normal. Accordingly, the controller 30 determines that the laundry Q is shifted and stops the rotation of the dewatering tank 4 (step S155). It should be noted that even if the safety switch 36 is not started (NO in step S152) because the detection 1 is simultaneously performed, if the integrated value G is greater than the first threshold value (in step S32 of FIG. 9B, YES), the control unit 30 determines that the laundry Q has shifted (step S33 in Fig. 9B) and stops the rotation of the dewatering tank 4 (step S41 in Fig. 12).

On the other hand, G _z is the fourth threshold is less than the value ( "No" at step S154), the control section 30 is small, so the vibration of the dewatering tank 4 bypass the safety switch when the safety switch 36 start-up ( 36) has malfunctioned and continues to operate (step S156). Thus, the success rate of the dewatering operation can be improved.

However, when the safety switch 36 is started again after the operation is continued, and the number of times of starting the safety switch 36 reaches a predetermined number (three times here) from the start of dehydration (YES in step S157) The control unit 30 determines that the safety switch 36 is operated normally and the laundry Q is shifted and stops the rotation of the dewatering tank 4 (step S155). That is, until the number of times that the safety switch 36 senses the eccentric rotation before the laundry Q is determined to be shifted reaches a predetermined number ("NO" in step S157), the control section 30 controls the dehydration tank 4 ) Is suspended and continues to operate. This prevents the rotation of the dewatering tank 4 from being stopped by the error detection of the mechanical mode using the safety switch 36, so that the eccentric rotation of the dewatering tank 4 can be initially suppressed. It should be noted that the predetermined number of times is not limited to the above-described three times but may be one time. In addition, it is preferable that the control operation of the modified example 4 is executed in the first acceleration step in which the rotation speed is low enough to ignore the operation of the safety switch 36 in step S156. Of course, the modified example 4 may be combined with the other modified examples 1, 2 and 3.

In a further modification 5 of Modification 4, the control operation shown in Fig. 25 can proceed. Modification 5 omits Steps S153 and S154 of Modification 4. In this case, even if the safety switch 36 is started to be turned "on" (YES in step S152) after the start of dehydration (step S151), the number of times of starting the safety switch 36 reaches a predetermined number (NO in step S157), the control unit 30 determines that the safety switch 36 is malfunctioning and continues to operate (step S156). However, if the integrated value G is equal to or greater than the first threshold value (YES in step S32 of FIG. 9B), the control unit 30 stops the rotation of the dehydrating tank 4 (Step S41 in FIG. 12). That is, if the integrated value G is smaller than the first threshold value, the control unit 30 ignores the start of the safety switch 36 twice or less.

On the other hand, when the number of times of startup of the safety switch 36 reaches three times (YES in step S157), the control unit 30 determines that the detection by the safety switch 36 is normal and the laundry Q is shifted The rotation of the dewatering tank 4 is stopped (step S155). In other words, similarly to Modification 4, in Modified Example 5, until the number of eccentric rotations sensed by the safety switch 36 before judging that the laundry Q has shifted reaches a predetermined number ("No" in Step S157) , The control unit 30 suspends the rotation stop of the dewatering tank 4 and continues to operate. Variation 5 may be combined with Variations 4, 2 and 3 in addition to Variation 4. However, in Modification 4, it is judged whether or not the safety switch 36 malfunctions based on the fourth threshold value lower than the first threshold value (see FIG. 24) The rotation of the dewatering tank 4 can be stopped.

In the above embodiment, the motor 6 is controlled based on the assumption that the inverter motor is used as the motor 6. However, when the motor 6 is a brush motor, And controls the motor 6 in place of the duty ratio.

In the above description, specific values such as 120 rpm, 240 rpm and 800 rpm are used for the rotational speed, but these specific values are values that can be changed according to the performance of the dehydrator 1. [ In the above description, the integrated value G is calculated on the basis of the moving average value C _n in Sense 1 to Sense 3, but if there is no influence of the error or the like, other information value to be decreased as the rotation speed of the motor 6 increases The integrated value G can be calculated based on any one information value of A _n and B _n . Other, even though the above-described integrated value G may be if there is no influence of the error of the moving average value, but accumulated value of E _n, sets of the above-described NS relative location value of the accumulated difference D _n. Other than, even though detection 4 but obtained the duty ratio used for the judgment, the duty ratio may be in the raw data of the duty ratio obtained, and be a value correction after the correction, as needed, the duty as described above moves the accumulated value C _m And may be an index value converted from the ratio.

1: dehydrator; 3: outer tub; 4: dehydration tank; 6: motor; 17: center axis; 19: Balance ring; 30: control unit; 34: counter; 36: Safety switch; C _m : mobile integrated value; C _n : moving average value; d _m : duty ratio; D _n : differential liquid; G: integrated value; K: oblique direction; n: count value; Q: Laundry; Z: vertical direction; Z2: Downward.

Claims (10)

A dewatering tank formed in a tubular shape having a central axis extending in an oblique direction with respect to the up and down direction and rotating around the central axis to receive laundry and dewater laundry;
A balance ring formed in a hollow annular shape to be mounted on the dehydrator in a coaxial state and being accommodated therein so as to freely flow the liquid for rotating balance of the dehydrator; And
The dehydrating tank rotates the dehydrating tank at a rotational speed lower than the minimum rotational speed at which the dehydrating tank generates resonance to detect the position of the laundry in the dehydrating tank and to determine whether the dehydrated tank is shifted in the dehydrating tank A dewatering preparation unit for stopping the rotation of the dewatering tank immediately before the laundry is positioned on the opposite side of the liquid shifted downward in the balance ring with the center axis interposed therebetween; Wherein the dehydrator comprises: A dewatering tank formed in a tubular shape having a central axis extending in an oblique direction with respect to the up and down direction and rotating around the central axis to receive laundry and dewater laundry;
An electric motor for rotating the dehydrating tank;
An information value obtaining unit that sequentially obtains information values to be decreased as the rotational speed of the motor is increased in an acceleration state in which the motor accelerates to a target rotational speed at which the laundry is dewatered in earnest;
A counting unit which adds 1 to a count value having an initial value of 0 when the information value acquiring unit acquires the information value each time;
A calculation unit for calculating an integrated value of the difference between the information value and the previous information value when the information value is larger than the previous information value;
A determining unit that determines that the laundry has shifted in the dehydrating tank when the integrated value when the count value is a predetermined value reaches a first threshold value when the count value is the predetermined value; And
A stop unit for stopping the rotation of the dehydrator when the determination unit determines that the laundry is shifted; Wherein the dehydrator comprises: 3. The method of claim 2,
Further comprising an information value correcting unit that corrects the information value through a moving average before calculating the integrated value using the calculating unit. The method according to claim 2 or 3,
And when the stop unit has stopped rotating the dehydrating tub, the dehydrating tub is rotated again to again dehydrate the laundry, and a correction process for correcting the deviation of the laundry in the dehydrating tub is executed and executed Unit,
Wherein the execution unit selects and executes the correction process instead of selecting and executing the restart process when the stop unit stops the rotation of the dehydrator after the restart process is executed a predetermined number of times. 5. The method according to any one of claims 2 to 4,
And an acceleration unit for accelerating the rotation of the motor in three steps of a first acceleration step, a second acceleration step and a third acceleration step,
The first accelerating step may include a step of increasing the rotational speed of the dewatering apparatus from a rotational speed of the motor toward the target rotational speed to a rotational speed at which the dewatering apparatus generates lateral resonance, Acceleration step,
The second acceleration step is an acceleration step from the first rotation speed to a second rotation speed higher than the first rotation speed,
The third acceleration step is an acceleration step from the second rotation speed to the target rotation speed,
Wherein the first threshold value is independently set in the first acceleration step, the second acceleration step and the third acceleration step, respectively,
Wherein the information value obtaining unit obtains the information value in the first acceleration step, the second acceleration step and the third acceleration step, respectively, and the counting unit adds 1 to the count value, And when the integrated value reaches the first threshold value, the judging unit judges that the laundry has shifted in the dehydrating tank. 6. The method of claim 5,
A duty ratio acquisition unit for acquiring a duty ratio of a voltage applied to the motor at every predetermined time in the third acceleration step; And
A conversion unit for converting the duty ratio acquired by the duty ratio acquisition unit into a predetermined index value; / RTI &gt;
And when the index value reaches a second threshold value of the corresponding time, the judging unit judges that laundry has been shifted in the dehydrating tank. The method according to claim 6,
And a threshold changing unit for changing the second threshold value according to the integrated value of at least one of the first acceleration step, the second acceleration step and the third acceleration step Dehydrator. 8. The method according to any one of claims 5 to 7,
Wherein when the amount of change of the integrated value reaches the third threshold value, the determination unit determines that the laundry is shifted in the dehydrating tank. A dewatering tank formed in a tubular shape having a central axis extending in an oblique direction with respect to the up and down direction and rotating around the central axis to receive laundry and dewater laundry;
An outer tank for receiving the dehydrating tank;
An electric motor for rotating the dehydrating tank;
A determining unit for determining that laundry has been shifted in the dewatering tank when an information value related to the rotational state of the motor at which the rotational speed of the motor reaches a target rotational speed for dewatering the laundry is reached to a threshold value;
A sensing unit mechanically sensing eccentric rotation of the dewatering bowl in contact with the outer tub when the dewatering bowl is rotated by eccentric rotation according to the deviation of the laundry in the dehydrating tub;
A stop unit for stopping the rotation of the dehydrator in accordance with the occurrence of any one of the cases where the determination unit determines that the laundry has been shifted and the detection unit detects eccentric rotation of the dehydrator; And
When the difference between the information value and the threshold value is greater than a predetermined value when the sensing unit senses eccentric rotation of the dehydrating tub or when the determining unit determines that the laundry has been shifted before sensing the eccentric rotation A threshold correcting unit for correcting the threshold value; Wherein the dehydrator comprises: A dewatering tank formed in a tubular shape having a central axis extending in an oblique direction with respect to the up and down direction and rotating around the central axis to receive laundry and dewater laundry;
An outer tank for receiving the dehydrating tank;
An electric motor for rotating the dehydrating tank;
A determining unit for determining that laundry has been shifted in the dewatering tank when an information value related to the rotational state of the motor at which the rotational speed of the motor reaches a target rotational speed for dewatering the laundry is reached to a threshold value;
A sensing unit mechanically sensing eccentric rotation of the dewatering bowl in contact with the outer tub when the dewatering bowl is rotated by eccentric rotation according to the deviation of the laundry in the dehydrating tub;
A stop unit for stopping the rotation of the dehydrator in accordance with the occurrence of any one of the cases where the determination unit determines that the laundry has been shifted and the detection unit detects eccentric rotation of the dehydrator; And
A holding unit for holding the rotation stop of the dehydration tank by the stop unit until the detection unit reaches a predetermined number of times before the determination unit determines that the laundry is shifted; Wherein the dehydrator comprises:

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