WO2016000479A1

WO2016000479A1 - Spin-dryer

Info

Publication number: WO2016000479A1
Application number: PCT/CN2015/077299
Authority: WO
Inventors: 川口智也; 佐藤弘树
Original assignee: 海尔亚洲株式会社; 青岛胶南海尔洗衣机有限公司
Priority date: 2014-06-30
Filing date: 2015-04-23
Publication date: 2016-01-07
Also published as: US20180155862A1; CN107709650B; JP2016026536A; KR20180012807A; KR102005360B1; CN107709650A; WO2016000433A1; JP6350874B2

Abstract

The present invention provides a spin-dryer which detects with improved accuracy whether articles of laundry are displaced. The spin-dryer (1) comprises an electrically-powered motor (6), which rotates a spin-dry tub (4), and a control unit (30). When the spin-dry tub (4) begins to rotate, the control unit (30) measures the load of articles of laundry (Q) inside the spin-dry tub (4). After measuring the load, the control unit (30) controls the duty cycle of the voltage applied to the electric motor (6), causing the electric motor (6) to rotate steadily at a first rotational speed, then causing the electric motor (6) to rotate steadily at a second rotational speed higher than the first rotational speed. While the electric motor (6) is in a state of acceleration up to the first rotational speed, the control unit (30) obtains a reference duty cycle at a time determined on the basis of the measured load. After obtaining the reference duty cycle and within a specified period, the control unit (30) determines, on the basis of an indicator representing the situation of the duty cycle changing from the reference duty cycle, whether there is a displacement of the articles of laundry (Q) inside the spin-dry tub (4).

Description

Dehydrator

Technical field

The invention relates to a dehydrator.

Background technique

Patent Document 1 listed below discloses a washing machine having a dehydrating function. When the washing machine is subjected to the dehydration operation in the washing machine, the motor that rotates the washing and dewatering tank in which the laundry is stored is controlled to rotate at a constant speed of 120 rpm and then rotates at a constant speed of 240 rpm by controlling the duty ratio of the applied voltage. Rotate at a constant speed of 800 rpm.

When the washing in the washing and dewatering tank is subjected to the dehydration operation in an unbalanced state in which the washing dewatering tank is biased in the circumferential direction, the vibration and the noise become large. Therefore, it is detected in the washing machine whether or not the laundry in the washing and dewatering tank is biased.

Specifically, the duty ratio at the time point of 3.6 seconds after the rotation speed of the motor starts to accelerate from 120 rpm to 240 rpm is taken as the reference duty ratio. Further, the target value of the duty ratio that changes with time in a state where the motor rotates at a constant speed of 240 rpm is calculated as a comparison duty ratio based on the reference duty ratio. Further, when the motor rotates at a constant speed of 240 rpm, when the difference between the actual duty ratio obtained at each predetermined timing and the comparison duty ratio at the same timing is equal to or greater than a predetermined threshold value, it is determined that the laundry is biased. Stop the rotation of the motor.

Prior art literature

Patent literature

Patent Document 1: Japanese Laid-Open Patent Publication No. 2011-240040

Summary of the invention

Problem to be solved by the invention

In the washing machine of Patent Document 1, it is determined that the rotational speed of the motor reaches 240 rpm when the rotational speed of the motor starts to accelerate from 120 rpm to 240 rpm, and the duty ratio at this time point is regarded as the reference duty. ratio.

However, since the rotation speed of the motor reaches 240 rpm, the time required will be based on the inside of the washing and dewatering tank. Since the amount of load of the laundry varies, it is not necessarily limited to the above-described 3.6 seconds.

The reference duty ratio is an important factor in the detection accuracy of whether or not the laundry is biased. However, in the case of Patent Document 1, the duty ratio is not considered, and the duty ratio at the time point of 3.6 seconds from the start of acceleration of the motor is uniformly regarded as the reference duty ratio. Therefore, when the reference duty ratio is a duty ratio obtained at a timing deviated from an appropriate timing due to the influence of the load amount, there is a possibility that the detection accuracy of the laundry may be adversely affected.

Further, in the case of having a structure for detecting whether or not the laundry is biased as described above, the problem that is always solved is to shorten the time of the dehydration operation.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a dehydrator capable of improving the detection accuracy of whether or not a laundry is biased.

Further, it is an object of the present invention to provide a dehydrator capable of shortening the time required for the dehydration operation.

Solution for solving problems

A dehydrator according to the present invention includes: a dewatering tank for storing laundry, rotating to dehydrate the laundry; an electric motor rotating the dewatering tank; and a load amount measuring unit when the dewatering tank starts to rotate And measuring a load amount of the laundry in the dewatering tank; and driving a control unit to control a duty ratio of a voltage applied to the motor after the load amount is measured by the load amount measuring unit; The motor rotates at a steady speed at a first rotational speed, and then the motor is rotated at a constant speed higher than the first rotational speed to cause the laundry to be officially dehydrated; the take-up unit is to be accelerated at the motor a duty ratio of a voltage applied to the motor is taken as a reference duty ratio in an acceleration state of the first rotation speed; and a timing determining unit determines a timing at which the acquisition unit acquires the reference duty ratio; The determining unit, after the obtaining unit acquires the reference duty ratio, is based on the electric power applied to the motor to maintain the first rotational speed for a predetermined period of time Determining whether or not the laundry in the dehydration tank is biased by an index of a change in duty ratio from the reference duty ratio; and stopping the control unit, where the determination unit determines that the laundry is biased Then, the rotation of the dehydration tank is stopped, and the timing determination unit determines the timing at which the acquisition unit acquires the reference duty ratio based on the load amount measured by the load amount measurement unit.

Further, the present invention is characterized by comprising: an execution unit that, when the stop control unit stops the rotation of the dehydration tank, selects one of the following actions according to the index: for restoring washing The rotation of the dewatering tank for dehydration of the material and the treatment for correcting the bias of the laundry in the dewatering tank.

Further, the present invention is characterized in that the drive control unit causes the motor to rotate at a constant speed lower than a predetermined speed lower than the first rotation speed before the motor is stably rotated at the first rotation speed, The execution unit shortens a period in which the motor is stably rotated at the predetermined speed in a case where rotation of the dewatering tank for recovering dehydration of laundry is performed.

Further, the dehydrator of the present invention includes: a dewatering tank that stores the laundry, rotates to dehydrate the laundry; an electric motor that rotates the dewatering tank; and a drive control unit that controls the motor by control a duty cycle of the voltage, thereby causing the motor to rotate at a steady speed at a first rotational speed, and then causing the motor to rotate at a steady speed at a second rotational speed higher than the first rotational speed to formally dehydrate the laundry And an acquisition unit that acquires the duty ratio for each predetermined timing within a predetermined period after the motor starts to accelerate toward the first rotation speed; and the counting unit, when the duty obtained by the acquisition unit is occupied When the ratio is greater than or equal to the duty ratio obtained just before, the count value with the initial value of zero is incremented by one, and when the duty ratio obtained by the acquisition unit is smaller than the duty ratio just obtained before, the count value is heavy. And determining, by the determining unit, when the count value is greater than or equal to a predetermined threshold, determining that the laundry is biased in the dewatering tank; and stopping the control unit in the judgment sheet When it is judged that the laundry is biased, the rotation of the dewatering tank is stopped.

Further, the dehydrator of the present invention includes: a dewatering tank that stores the laundry, rotates to dehydrate the laundry; an electric motor that rotates the dewatering tank; and a drive control unit that controls the motor by control a duty cycle of the voltage, thereby causing the motor to rotate at a steady speed at a first rotational speed, and then causing the motor to rotate at a steady speed at a second rotational speed higher than the first rotational speed to formally dehydrate the laundry And an acquisition unit that acquires the duty ratio for each predetermined timing while a rotation speed of the motor reaches the second rotation speed from the first rotation speed; and a determination unit when the acquisition unit When the obtained duty ratio is greater than or equal to a predetermined threshold value, it is determined that the laundry is biased in the dewatering tank; the control unit is stopped, and when the determination unit determines that the laundry is biased, the The rotation of the water tank is stopped; the receiving unit receives a selection of the dehydration condition of the laundry; and a threshold changing unit that receives the selected dehydration condition according to the receiving unit Changing the threshold value.

Effect of the invention

According to the present invention, as the dehydration operation of the dehydrator, by controlling the duty ratio of the voltage applied to the electric motor that rotates the dehydration tank, the motor is stably rotated at the first rotation speed, and then the motor is rotated by the first rotation. The second rotation speed at a high speed is stably rotated, whereby the laundry in the dewatering tank is officially dehydrated.

In association with the detection of the presence or absence of the laundry in the dewatering tank, the reference duty ratio is obtained by the acquisition unit when the motor is accelerated to the acceleration state of the first rotation speed. After acquiring the reference duty ratio, the acquisition unit displays an index indicating a change in the duty ratio of the voltage applied to the motor to maintain the first rotation speed from the reference duty ratio for a predetermined period of time. Determine whether the laundry in the dewatering tank is biased. When it is determined that the laundry is biased, the rotation of the dewatering tank is stopped.

As a part of such a bias-free detection, when the dewatering tank starts to rotate, the load amount of the laundry in the dewatering tank is measured, and the timing determining means determines the timing at which the acquisition unit acquires the reference duty ratio based on the measured load amount. Thereby, since the reference duty ratio is obtained at an appropriate timing in consideration of the influence of the load amount, it is possible to accurately detect the presence or absence of the laundry based on the reference duty. As a result, it is possible to improve the detection accuracy of whether or not the laundry is biased.

Further, according to the present invention, when the rotation of the dewatering tank is stopped in accordance with the determination that the laundry is biased, the following operation is selected based on the index indicating that the duty ratio changes from the reference duty ratio. One: a process for recovering the spin-drying of the dewatering of the laundry, and a process of correcting the bias of the laundry in the dewatering tank.

That is to say, when it is judged that the laundry is biased, the process of correcting the bias of the laundry is not always performed. Therefore, when the index is an index indicating that the deviation of the laundry is small, the dewatering tank is immediately rotated to be dehydrated, whereby the time for the dehydration operation can be shortened.

Further, according to the present invention, in the dehydration operation including the step of rotating the motor at a predetermined speed lower than the first rotation speed, in the case of performing the rotation of the dewatering tank for recovering the dehydration of the laundry, the step is The period is shortened, so that the time for further dehydration operation can be further shortened.

Further, according to the present invention, as the dehydration operation in the dehydrator, by controlling the duty ratio of the voltage applied to the electric motor that rotates the dehydration tank, the motor is stably rotated at the first rotation speed, and then the motor is compared The second rotation speed at which the first rotation speed is high is rotated at a constant speed, whereby the laundry in the dewatering tank is officially dehydrated.

In association with the detection of the presence or absence of the laundry in the dewatering tank, after the motor starts to accelerate toward the first rotation speed, the duty ratio is obtained for each predetermined timing within a predetermined period, and each duty ratio is The duty cycle just obtained is compared. Specifically, when the obtained duty ratio is greater than or equal to the duty ratio obtained just before, the count value whose initial value is zero is incremented by one, and when the obtained duty ratio is smaller than the duty ratio just obtained before, the count is counted. The value is reset to the initial value.

Then, when the count value is greater than or equal to a predetermined threshold, it is determined that the laundry in the dewatering tank has Bias, stop the rotation of the dewatering tank.

As long as the configuration in which the duty ratios between the adjacent timings are constantly monitored as described above is performed, even if the change in the initial duty ratio obtained at the start of the detection is small, the duty ratio in the middle of the detection can be captured in real time. Accurate detection of changes, so that the detection accuracy of the laundry can be improved.

Further, according to the present invention, as the dehydration operation of the dehydrator, by controlling the duty ratio of the voltage applied to the electric motor that rotates the dehydration tank, the motor is stably rotated at the first rotation speed, and then the motor is made A second rotation speed having a high rotation speed is stably rotated, whereby the laundry in the dewatering tank is officially dehydrated.

In association with the detection of the presence or absence of the laundry in the dewatering tank, the duty ratio is obtained for each predetermined timing while the rotational speed of the motor reaches the second rotational speed from the first rotational speed. When the duty ratio is equal to or greater than a predetermined threshold value, it is determined that the laundry is biased in the dewatering tank, and the rotation of the dewatering tank is stopped.

The dehydrator can receive a selection of dehydration conditions for the laundry by the receiving unit, and can change the threshold according to the received dehydration conditions. Thereby, in the dehydration operation under each dehydration condition, it is possible to detect whether or not the laundry is biased based on the threshold value suitable for each dehydration condition, so that the detection accuracy of the presence or absence of the laundry can be improved.

DRAWINGS

Fig. 1 is a schematic longitudinal cross-sectional right side view showing a dehydrator 1 according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the electrical configuration of the dehydrator 1.

FIG. 3 is a timing chart showing a state of the number of revolutions of the motor 6 in the spin-drying operation performed by the dehydrator 1.

4 is a graph showing the relationship between the weight of the laundry stored in the dewatering tank 4 of the dehydrator 1 and the amount of load detected by the dehydrator 1 based on the weight of the laundry.

FIG. 5A is a flowchart showing an outline of detection 1 to detection 4 for detecting whether or not the laundry in the dehydration tank 4 is biased during the dehydration operation.

FIG. 5B is a flowchart showing an outline of detection 1 to detection 4 for detecting the presence or absence of the laundry in the dehydration tank 4 during the dehydration operation.

FIG. 6A is a flowchart showing a control operation related to the detection 1 and the detection 2.

FIG. 6B is a flowchart showing a control operation related to the detection 1 and the detection 2.

FIG. 7 is a graph showing the relationship between the rotational speed of the motor 6 and the rotational speed Sn in association with the detection 1.

FIG. 8 is a graph showing the relationship between the number of revolutions of the motor 6 and the cumulative value U of the absolute value of the difference with respect to the difference S in association with the detection 2.

FIG. 9A is a flowchart showing a control operation related to the detection 3 and the detection 4.

FIG. 9B is a flowchart showing a control operation related to the detection 3 and the detection 4.

FIG. 10 is a graph showing the relationship between time and the first count value E in association with the detection 3.

FIG. 11 is a graph showing the relationship between the time and the corrected duty ratio dn_diff in association with the detection 4.

FIG. 12 is a flowchart showing an outline of detection 5-1 and detection 5-2 for detecting whether or not the laundry in the dewatering tank 4 is biased during the dehydrating operation.

FIG. 13 is a flowchart showing a control operation related to the detection 5-1.

FIG. 14 is a graph showing the relationship between the rotational speed and the movement cumulative value Cn in association with the detection 5-1 and the detection 5-2.

Fig. 15 is a flowchart showing a control operation related to the detection 5-2.

Fig. 16 is a flowchart showing a control operation of detecting bubbles in a dehydrating operation.

detailed description

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

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

The vertical direction of FIG. 1 is referred to as the vertical direction X of the dehydrator 1, and the horizontal direction of FIG. 1 is referred to as the front-rear direction Y of the dehydrator 1. First, the outline of the dehydrator 1 will be described. In the up and down direction X, the upper side is referred to as an upper X1, and the lower side is referred to as a lower X2. In the front-rear direction Y, the left side of FIG. 1 is referred to as front Y1, and the right side of FIG. 1 is referred to as rear Y2.

The dehydrator 1 includes all means capable of performing the dehydration operation of the laundry Q. Therefore, the dehydrator 1 includes not only a device having only a dehydrating function but also a washing machine having a dehydrating function and a washer-dryer. Hereinafter, the dehydrator 1 will be described by taking a washing machine as an example.

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

The casing 2 is made of, for example, metal and formed in a box shape. The upper surface 2A of the casing 2 is formed to be inclined with respect to the front-rear direction Y so as to extend upward X1 toward the rear Y2. An opening 8 that communicates the inside and the outside of the casing 2 is formed on the upper surface 2A. A door 9 that opens and closes the opening 8 is provided on the upper surface 2A. An operation portion composed of a liquid crystal operation panel or the like is provided in a region of the upper surface 2A that is further forward than Y1 than the opening 8. 20. By operating the operation unit 20, the user can freely select the dehydration condition or instruct the dehydrator 1 to start the operation, stop the operation, and the like.

The outer tub 3 is made of, for example, a resin, and is formed in a bottomed cylindrical shape. The outer tub 3 includes a substantially cylindrical circumferential wall 3A disposed along the vertical direction X, a bottom wall 3B that blocks the hollow portion of the circumferential wall 3A from the lower side X2, and an annular annular wall 3C that surrounds the circumferential wall 3A. The edge on the upper X1 side is trimmed and simultaneously protrudes toward the center side of the circumferential wall 3A. An inlet and outlet 10 that communicates with the hollow portion of the circumferential wall 3A from the upper side X1 is formed inside the annular wall 3C. The doorway 10 is opposed to the opening 8 of the casing 2 from the lower side X2, and is in a communicating state. A door 11 that opens and closes the inlet and outlet 10 is provided in the annular wall 3C. The bottom wall 3B is formed in a disk shape extending substantially horizontally, and a through hole 3D penetrating the bottom wall 3B is formed at a center position of the bottom wall 3B.

Water is stored in the outer tank 3. The outer tank 3 is connected to the water supply path 12 connected to the tap of the tap water from the upper side X1, and the tap water is supplied from the water supply path 12 into the outer tank 3. A water supply valve 13 that opens and closes to start or stop the water supply is provided in the middle of the water supply path 12. The outer tank 3 connects the drain passage 14 from the lower side X2, and the water in the outer tank 3 is discharged from the drain passage 14 to the outside of the washing machine. A drain valve 15 that opens and closes to start or stop the drain is provided in the middle of the drain passage 14.

The dewatering tank 4 is made of, for example, metal, and has a bottomed cylindrical shape that is smaller than the outer tank 3, and can store the laundry Q therein. The dewatering tank 4 has a substantially cylindrical circumferential wall 4A disposed along the vertical direction X and a bottom wall 4B that blocks the hollow portion of the circumferential wall 4A from the lower side X2.

The inner circumferential surface of the circumferential wall 4A is the inner circumferential surface of the dewatering tank 4. The upper end portion of the inner circumferential surface of the circumferential wall 4A is an inlet and outlet 21 that exposes the hollow portion of the circumferential wall 4A upward. The entrance and exit 21 is opposed to the entrance and exit 10 of the outer tub 3 from the lower side X2, and is in a communicating state. The entrances and exits 10 and 21 are opened and closed by the door 11. The user of the dehydrator 1 takes out the laundry Q into the dewatering tank 4 via the opened opening 8, the inlets 10 and 21, and 21.

The dewatering tank 4 is housed in the outer tank 3 coaxially. The dewatering tank 4 in a state of being housed in the outer tub 3 is rotatable about an axis 16 extending in the vertical direction X constituting the central axis thereof. Further, 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 can pass between the outer tank 3 and the dewatering tank 4 through the through holes. Therefore, the water level in the outer tank 3 coincides with the water level in the dewatering tank 4.

The bottom wall 4B of the dewatering tank 4 is formed in a disk shape extending substantially in parallel with respect to the bottom wall 3B of the outer tank 3 at an interval from the upper side X1, and a center portion of the bottom wall 4B that coincides with the axis 16 is formed to penetrate the bottom wall. 4B through hole 4C. The bottom wall 4B is provided to surround the through hole 4C and extend downward along the axis 16 by X2 Extending tubular support shaft 17. The support shaft 17 is inserted into the through hole 3D of the bottom wall 3B of the outer tub 3, and the lower end portion of the support shaft 17 is located below the bottom wall 3B by X2.

The rotary blade 5, that is, the pulsator, is formed in a disk shape centered on the axis 16 and is disposed concentrically with the dewatering tank 4 along the bottom wall 4B in the dewatering tank 4. On the rotary blade 5, a plurality of blades 5A arranged radially are provided on the upper surface of the inlet and outlet 21 facing the dewatering tank 4. The rotary wing 5 is provided with a rotary shaft 18 extending from its center along the axis 16 to the lower side X2. The rotating shaft 18 is inserted into the hollow portion of the support shaft 17, and the lower end portion of the rotating shaft 18 is located below the bottom wall 3B of the outer tub 3 by X2.

In the present embodiment, the motor 6 is realized by a variable frequency motor. The motor 6 is disposed in the casing 2 below the outer groove 3 X2. The motor 6 has an output shaft 19 that rotates about the axis 16 . The transmission mechanism 7 is interposed between the lower end portion of each of the support shaft 17 and the rotary shaft 18 and the upper end portion of the output shaft 19. The transmission mechanism 7 selectively transmits the driving force output from the output shaft 19 of the motor 6 to one or both of the support shaft 17 and the rotary shaft 18. A well-known mechanism can be used as the transmission mechanism 7.

When the driving force of the motor 6 is transmitted to the support shaft 17 and the rotary shaft 18, the dewatering tank 4 and the rotary wing 5 rotate about the axis 16. In the washing operation and the rinsing operation, the laundry Q in the dewatering tank 4 is stirred by the rotating dewatering tank 4 and the blades 5A of the rotary vane 5. Further, in the dehydration operation after the rinsing operation, the laundry Q in the dewatering tank 4 is integrally rotated at a high speed by the dewatering tank 4 and the rotary vane 5 to be dehydrated.

Referring to Fig. 2, the dehydrator 1 includes a load amount measuring unit, a drive control unit, an acquisition unit, a timing determination unit, a determination unit, a stop control unit, an execution unit, a counting unit, a receiving unit, and a control unit 30 as a threshold changing unit. The control unit 30 is configured, for example, as a microcomputer including a memory 32 such as a CPU 31, a ROM, or a RAM, a timer 35, and a counter 36, and is incorporated in the casing 2 (see FIG. 1).

The dehydrator 1 further includes a water level sensor 33 and a rotational speed reading device 34. The water level sensor 33 and the rotational speed reading device 34, and the motor 6, the transmission mechanism 7, the water supply valve 13, the drain valve 15, and the operation unit 20 described above are electrically connected to the control unit 30, respectively.

The water level sensor 33 is a sensor that detects the water level of the outer tank 3 and the dewatering tank 4, and the detection result of the water level sensor 33 is input to the control unit 30 in real time.

The rotational speed reading device 34 is a device that reads the rotational speed of the motor 6, and strictly reads the rotational speed of the output shaft 19 of the motor 6, and is constituted by, for example, a Hall IC. The rotational speed read by the rotational speed reading device 34 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 based on the input rotational speed, Thereby the motor 6 is rotated at the desired rotational speed.

The control unit 30 controls the transmission mechanism 7 to switch the transmission target of the driving force of the motor 6 to one or both of the support shaft 17 and the rotation shaft 18. The control unit 30 controls opening and closing of the water supply valve 13 and the drain valve 15. As described above, when the user operates the operation unit 20 to select the dehydration condition or the like of the laundry Q, the control unit 30 receives the selection.

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

FIG. 3 is a timing chart showing a state of the number of revolutions of the motor 6 in the spin-drying operation performed by the dehydrator 1. In the timing chart of Fig. 3, the horizontal axis represents the elapsed time, and the vertical axis represents the rotational speed (unit: rpm) of the motor 6.

Referring to Fig. 3, in the spin-drying operation, the control unit 30 measures the amount of load of the laundry Q in the dewatering tank 4 when the dewatering tank 4 starts to rotate. After the load amount is measured, the control unit 30 rotates the motor 6 at a constant speed of 120 rpm after raising the rotational speed of the motor 6 to a predetermined speed of 120 rpm. Then, the control unit 30 rotates the motor 6 at a constant speed of 240 rpm after raising the motor 6 from 120 rpm to a first rotation speed of 240 rpm. Then, the control unit 30 rotates the motor 6 at a constant speed of 800 rpm after raising the motor 6 from 240 rpm to a second rotation speed of 800 rpm. The laundry Q in the dewatering tank 4 is officially dehydrated by the motor 6 rotating at a constant speed at 800 rpm.

When the laundry Q in the dewatering tank 4 is in a state of being biased in the circumferential direction of the dewatering tank 4, the laundry Q is biased in the dewatering tank 4. When the dehydration operation is performed in this state, the dewatering tank 4 is eccentrically rotated, whereby the dewatering tank 4 is largely swung, and the dehydrator 1 is greatly vibrated, and noise may be generated.

Therefore, the control unit 30 detects whether or not the laundry Q in the dewatering tank 4 is biased in the middle of the dehydration operation, and stops the motor 6 when the bias is detected. As such detection, the control unit 30 performs five kinds of electrical detections of detection 1, detection 2, detection 3, detection 4, and detection 5.

The detection 1 to the detection 4 are executed in a low-speed eccentricity detection section constituted by an acceleration period in which the rotational speed of the motor 6 is increased from 120 rpm to 240 rpm and a predetermined period after the acceleration of the motor 6 is started at 240 rpm. The detection 5 is performed in a high-speed eccentricity detection section during a period in which the rotational speed of the motor 6 reaches 800 rpm from 240 rpm.

4 is a graph showing the relationship between the weight of the laundry Q stored in the dewatering tank 4 and the amount of load detected by the dehydrator 1 in accordance with the weight of the laundry Q. In the graph of Fig. 4, the horizontal axis represents the weight (unit: kg) of the laundry Q, and the vertical axis represents the detected value of the load amount.

Referring to Fig. 4, as described above, when the dewatering tank 4 starts to rotate, the control unit 30 measures the amount of load of the laundry Q in the dewatering tank 4. The control unit 30 causes the dewatering tank 4 to rotate at a predetermined speed when the dewatering tank 4 starts rotating. The rotation is performed to detect a value obtained by integrating the duty ratio of the voltage applied to the motor 6 at a certain time as a load amount. When the laundry Q becomes heavy, since a high voltage must be applied to the motor 6 to rotate the dewatering tank 4, the load amount becomes large as the voltage is increased. In this manner, the control unit 30 electrically measures the amount of load of the laundry Q.

5A and 5B are flowcharts showing an outline of the detection 1 to the detection 4.

5A and 5B, when the spin-drying rotation of the dewatering tank 4 is started by the start of the dehydration operation (step S1), as described above, the control unit 30 measures the load amount of the laundry Q in the dewatering tank 4 (step S2), Then, the motor 6 is rotated at a constant speed of 120 rpm for a predetermined time (step S3).

Then, the control unit 30 starts accelerating the motor 6 to 240 rpm (step S4), and performs the above-described detection 1 during the acceleration of the motor 6 (step S5). When the detection 1 is not OK (step S5: NO), that is, when the control unit 30 determines that the laundry Q is biased, the control unit 30 stops the motor 6 and stops the rotation of the dewatering tank 4 (step S6). Then, it is judged whether or not the dehydration operation can be restarted (step S7).

The restarting of the dehydration operation means that the control unit 30 rotates the dewatering tank 4 again in order to resume the dehydration operation immediately after the rotation of the dewatering tank 4 is stopped and the dehydration operation is stopped. Although the details will be described later, depending on the degree of deviation of the laundry Q, a restart may be performed.

In the case where the restart or the restart is not performed (step S7: YES), the control unit 30 performs the restart (step S8). The control unit 30 shortens the period of the steady rotation of 120 rpm in the restarting dehydration operation to be shorter than the period of the steady rotation of 120 rpm in the dehydration operation just before the suspension. In the case of restarting, since the laundry Q is attached to the inner circumferential surface of the dewatering tank 4 to some extent and most of the water is removed, it is possible to shorten the period of steady rotation of 120 rpm. Thereby, the time for the dehydration operation can be shortened. In addition, such a period shortening can also be performed in subsequent subsequent restarts.

When the restart is not possible (step S7: NO), the control section 30 performs the process of the imbalance correction (step S9). In the imbalance correction, the control unit 30 opens the water supply valve 13 after closing the drain valve 15, and supplies water into the dewatering tank 4 to a predetermined water level, thereby immersing the laundry Q in the dewatering tank 4 in water to be easily released. In this state, the control unit 30 rotates the dewatering tank 4 and the rotary blade 5 to peel off the laundry Q attached to the inner circumferential surface of the dewatering tank 4, thereby agitating the laundry in the dewatering tank 4. Q's bias.

On the other hand, when the detection 1 is OK (step S5: YES), that is, when the control unit 30 determines that the laundry Q is not biased in the detection 1, the control unit 30 is during the acceleration of the motor 6. The detection 2 described above is continued (step S10).

When the detection 2 is not OK (step S10: NO), that is, when the control unit 30 determines that the laundry Q is biased, the control unit 30 stops the motor 6 and the dehydration tank 4, and stops the dehydration operation (step S11). Then, the control unit 30 confirms that the dehydration condition of the dehydration operation that was suspended this time is "blanket washing process" or "dehydration only operation" (step S12).

The blanket washing process refers to a dewatering condition in which the laundry Q which is easily absorbed by a felt or the like is dehydrated. In the case where the dehydration condition is the felt washing process (step S12: YES), and the dehydration operation that was suspended this time is before the restart, that is, before the restart (step S13: YES), the control unit 30 performs the stabilization of the shortening of 120 rpm. The restart of the rotation period (step S14).

In the case of the felt washing process, a large amount of water oozing out from the felt and accumulated in the outer tub 3 hinders the rotation of the dewatering tank 4, and thus the control unit 30 may erroneously determine that the detection 2 is not OK. Moreover, when the imbalance correction is performed despite the erroneous judgment and the felt absorbs a large amount of water again, it is possible to make a misjudgment again in the subsequent detection 2. Therefore, when it is determined that the detection 2 is not OK during the carpet washing process, if the restart is not performed (step S13: YES), the unbalance correction is not performed but the restart is performed (step S14). On the other hand, in the case where it is not before the restart, that is, as long as the restart is performed on the dehydration operation of this suspension (step S13: NO), the control unit 30 performs the imbalance correction (step S15).

The dehydration-only operation is not a dehydration operation performed following the washing operation and the rinsing operation, but refers to a dehydrating condition in which the washed rinsing Q that has been rinsed is put into the dewatering tank 4 and the laundry Q is dehydrated. When the dehydration condition is the dehydration only operation (step S12: YES), and it is before the restart (step S13: YES), the control unit 30 performs the restart (step S14).

In the case of only the dehydration operation, when the rinsed laundry Q is wetted by the imbalance correction, it is meaningless to prepare the laundry Q which has been rinsed in advance. Therefore, in the case where it is determined that the detection 2 is not OK during the dehydration operation only, if the restart is not performed, the unbalance correction is not performed and the restart is performed. Further, the control unit 30 may prompt the user to reset the laundry Q in the dehydration tank 4 by the display of the operation unit 20 and an error by a buzzer or the like. On the other hand, if it is not before the restart (step S13: No), the control unit 30 performs the imbalance correction (step S15).

On the other hand, when the dehydration condition is neither the felt washing process nor the dehydrating operation only (step S12: NO), the control unit 30 determines that the dehydration operation that was suspended this time is before the restart, and thereby judges whether or not the restart is possible (step S16). When it is before the restart and can be restarted (step S16: YES), the control unit 30 executes the restart of the period in which the steady rotation of 120 rpm is shortened (step S17). When the condition before the restart and the restart is not satisfied (step S16: NO), the control unit 30 performs the imbalance correction (step S18).

When the detection 2 is OK (step S10: YES), that is, when the control unit 30 determines that the laundry Q is not biased in the detection 2, the control unit 30 confirms whether or not the value of the timer 35 is per The set value of the load amount is equal to or greater (step S19). In other words, the control unit 30 confirms in step S19 whether or not the measurement time of the timer 35 has reached the set value corresponding to the load amount of the laundry Q in the dehydration tank 4. The setting values are described in detail below.

When the value of the timer 35 is equal to or greater than the set value of the load amount (step S19: YES), the control unit 30 performs the above-described detection 3 and detection 4 in a state where the motor 6 is stably rotated at 240 rpm (step S20). . When the detection 3 and the detection 4 are not OK (step S20: NO), that is, when the control unit 30 determines that the laundry Q is biased, the control unit 30 stops the motor 6 and the dehydration tank 4, and stops the dehydration operation. (Step S11), the corresponding processing is executed in steps S12 to S18.

On the other hand, when the detection 3 and the detection 4 are OK (step S20: YES), that is, the control unit 30 determines that the laundry Q is not biased in the detection 3 and the detection 4, the control unit 30 continues. The motor 6 was rotated at a constant speed of 240 rpm, and dehydration at 240 rpm was continued (step S21).

Next, the detection 1 to the detection 4 will be described in detail.

6A and 6B are flowcharts showing control operations regarding the detection 1 and the detection 2. First, the detection 1 and the detection 2 will be described with reference to FIGS. 6A and 6B. The detection 1 and the detection 2 are detections of whether or not the laundry Q is deflected by the rotational speed of the motor 6.

In the above-described step S4, the control unit 30 starts accelerating the motor 6 to 240 rpm, and starts the detection 1 and the detection 2. First, the control unit 30 starts the timer 35 to start counting, and the rotation speed reading device 34 measures the rotation speed V0 of the motor 6 at the start of acceleration (step S31). The rotational speed V0 is about 120 rpm.

Regarding the value of the timer 35, that is, regarding the timing, the detection time of the detection 1 and the detection 2, that is, the acceleration period in which the motor 6 accelerates to 240 rpm differs depending on the amount of each load. The reason is that the more the amount of the laundry Q, the more time the motor 6 rotates at a speed of 240 rpm. Therefore, the set value per load amount in the acceleration period of the motor 6 is obtained in advance by an experiment or the like, and is stored in the memory 32.

Then, the control unit 30 starts counting by the counter 36 (step S32), and initializes the counter 36 every 0.3 seconds elapsed, thereby counting in units of 0.3 seconds (steps S33 and S34).

The control unit 30 measures the number of revolutions Vn (n: count value) of the motor 6 at the time of counting for each count (step S35). In step S35, the control unit 30 calculates the difference Sn between the measured rotational speeds Vn and the rotational speed Vn-1 just measured before Vn. Further, in step S35, the control unit 30 calculates the integrated value U of the absolute value of the difference between the difference Sn and the difference Sn-1 immediately before.

Next, the control unit 30 confirms whether or not the value of the timer 35 has reached the set value or more per load amount, that is, whether or not the measurement time of the timer 35 has reached the setting corresponding to the load amount of the laundry Q in the dehydration tank 4 The value is set (step S36). Step S36 corresponds to the above-described step S19 (refer to FIG. 5A).

In the case where the value of the timer 35 is lower than the set value per load amount, that is, in the case where the measurement time of the timer 35 has not reached the corresponding set value (step S36: NO), when the dehydration tank When the load amount of the laundry Q in the fourth item is equal to or less than a predetermined amount (step S37: YES), the control unit 30 determines whether or not the difference Sn just calculated is within the range of the detection 1 (step S38). This predetermined amount is obtained in advance by experiments or the like and stored in the memory 32.

Specifically, regarding the difference Sn, a threshold value is set in advance and stored in the memory 32. FIG. 7 is a graph showing the relationship between the number of revolutions of the motor 6 and the difference Sn in association with the detection 1. In the graph of Fig. 7, the horizontal axis represents the rotational speed (unit: rpm), and the vertical axis represents the difference Sn (unit: rpm).

Referring to the range of the rotational speed indicated by the dotted arrow in Fig. 7, when the eccentricity is considered to be small and the laundry Q is not biased, since the acceleration of the dewatering tank 4 is stabilized, the deviation of the difference Sn as shown by the solid line is small. However, when it is considered that the eccentricity is large and the laundry Q is biased, since the acceleration of the dewatering tank 4 is unstable, the deviation of the difference Sn is large as indicated by a broken line, and the minimum value of the difference Sn is lower than the threshold. Therefore, referring back to FIG. 6A, when the difference Sn is equal to or smaller than the threshold value, the control unit 30 determines that the difference Sn is within the range of the detection 1 (step S38: YES). As described above, in the detection 1, the degree of instability of the acceleration of the dewatering tank 4 indicating whether or not the laundry Q is biased is detected based on the difference Sn.

When the control unit 30 determines that the difference Sn is within the range of the detection 1 (step S38: YES), the rotation of the motor 6 is stopped (the above-described step S6), and the corresponding processing in the above-described steps S7 to S9 is executed (refer to FIG. 5A). . The processing of steps S31 to S38 is included in the above-described step S5 (refer to FIG. 5A).

When the control unit 30 determines that it is not within the range of the detection 1 by the difference Sn exceeding the threshold value (step S38: No), it is determined whether or not the accumulated value U just calculated is within the range of the detection 2 (step S39).

In addition, when the load amount of the laundry Q in the dewatering tank 4 exceeds a certain amount (step S37: No), the control unit 30 does not perform the determination of the detection 1 in the step S38, but performs the detection 2 in the step S39. Judge. The reason is that, in the case where the amount of the laundry Q is large enough to exceed a certain amount, the amount of water oozing out from the laundry Q is large, or the deviation of the laundry Q is suddenly attached to the inner circumferential surface of the dewatering tank 4 by the laundry Q. The above changes abruptly, so there is a possibility that the detection 1 cannot be performed stably. Therefore, in the case where the amount of the laundry Q exceeds a certain amount, the detection 1 is omitted.

Whether the accumulated value U is used for the determination within the range of the detection 2, and the threshold value is set in advance for the cumulative value U, It is stored in the memory 32. FIG. 8 is a graph showing the relationship between the number of revolutions of the motor 6 and the cumulative value U in association with the detection 2. In the graph of Fig. 8, the horizontal axis represents time (unit: sec), and the vertical axis represents integrated value U (unit: rpm). Referring to Fig. 8, the threshold values are set with two threshold values, a lower threshold indicated by a four-corner point and an upper threshold indicated by a triangular point. The upper threshold is a value higher than the lower threshold.

In the case where the eccentricity is small and the laundry Q is unbiased, since the acceleration of the dewatering tank 4 is stabilized, as shown by the solid line, the cumulative value U is lower than the lower threshold at any timing. However, in the case where the eccentricity is large and the laundry Q is biased, since the acceleration of the dewatering tank 4 is unstable, the cumulative value U exceeds the lower threshold at any timing as indicated by a broken line. When the bias of the laundry Q is large, the cumulative value U also exceeds the upper threshold. Therefore, returning to FIG. 6A, when the integrated value U is greater than or equal to the lower threshold, the control unit 30 determines that the integrated value U is within the range of the detection 2 (step S39: YES). As described above, in the detection 2, the degree of instability of the acceleration of the dewatering tank 4 indicating whether or not the laundry Q is biased is detected based on the integrated value U.

When the control unit 30 determines that the integrated value U is within the range of the detection 2 (step S39: YES), the rotation of the motor 6 is stopped (step S11 described above), and the corresponding processing in steps S12 to S18 described above is executed. The processing of steps S31 to S37 and step S39 is included in the above-described step S10 (refer to FIG. 5A).

When the dehydration condition is neither the felt washing process nor the dehydrating operation (step S12: NO), the control unit 30 determines in step S16 whether the deviation of the laundry Q is so large that the cumulative value U is equal to or greater than the upper threshold, or Whether the dehydration operation of this suspension has been restarted.

When the integrated value U is equal to or greater than the upper threshold, or when the restart has been completed (step S16: YES), the control unit 30 performs imbalance correction (step S18). When the cumulative value U is less than the upper threshold and the restart is not completed (step S16: No), the control unit 30 performs a restart (step S17). The determination as to whether or not the cumulative value U is equal to or greater than the upper threshold is equivalent to the determination of whether or not the restart is possible in step S16 of FIG. 5B, and whether or not the restart has been completed corresponds to whether or not the determination is made before the restart in step S16 of FIG. 5B.

In the steps S16 to S18, the control unit 30 determines whether the bias in the range of the detection 2 is small enough to continue the restart or whether the imbalance correction is necessary, based on whether or not the integrated value U is equal to or greater than the upper threshold. Degree, depending on the size of the bias, choose to perform the restart and imbalance correction.

Further, in a state where it is judged that the laundry Q is not biased in any of the detection 1 and the detection 2, when the value of the timer 35 reaches the set value per load amount (step S36: YES), the control unit 30 ends the detection. 1 and detection 2 (step S40). Further, in step S40, the control unit 30 takes the duty ratio of the voltage applied to the motor 6 at the time point when the value of the timer 35 reaches the set value as the reference duty ratio d0. At the point in time when the value of the timer 35 reaches the set value and the processing of step S40 is performed, the motor 6 is accelerated to Acceleration state of 240 rpm.

As described above, the set value in step S36 differs depending on the amount of each load of the laundry Q in the dewatering tank 4. Therefore, the control unit 30 determines the timing at which the reference duty ratio d0 is obtained in step S40 based on the amount of load measured during the spin-drying rotation of the dewatering tank 4. In other words, the control unit 30 changes the timings of the detection 3 and the detection 4 after the end detection 1 and the detection 2 are started, based on the amount of load. Therefore, the detection 3 and the detection 4 can be performed at an optimum timing corresponding to the amount of the laundry Q.

9A and 9B are flowcharts showing control operations regarding the detection 3 and the detection 4. The detection 3 and the detection 4 will be described with reference to FIGS. 9A and 9B. The detection 3 and the detection 4 are detections of whether or not the laundry Q using the duty ratio of the voltage applied to the motor 6 is biased.

The control unit 30 acquires the reference duty ratio d0 in the above-described step S40, and starts the detection 3 and the detection 4. At the start of the detection 3 and the detection 4, the rotational speed of the motor 6 was at a state of 240 rpm, and the motor 6 was rotated at a constant speed of 240 rpm.

The first count value E and the second count value T are stored in the memory 32 in association with the detection 3 and the detection 4. When the detection unit 3 starts the detection 3 and the detection 4, the control unit 30 clears the first count value E and the second count value T to the initial value 0 (zero), respectively (step S41).

Then, the control unit 30 starts the timer 35, starts counting (step S42), and monitors whether the value of the timer 35 exceeds 8.1 seconds. The third detection and the fourth detection are performed within a predetermined period of 8.1 seconds after the reference duty ratio d0 is obtained.

Further, the control unit 30 starts counting by the counter 36 in step S42, and initializes the counter 36 every 0.3 seconds, thereby counting in units of 0.3 seconds (steps S43 and S44). In step S44, the control unit 30 increments the second count value T by 1 (+1) at the timing of initializing the counter 36, that is, at the timing of each count.

The control unit 30 acquires the duty ratio dn(n: count value) of the voltage applied to the motor 6 at the time of counting every time it counts (step S45). In other words, the control unit 30 acquires the duty ratio dn at a predetermined timing every 0.3 seconds in the predetermined period of 8.1 seconds described above.

Further, in step S45, the control unit 30 calculates the correction duty dn_diff for every 0.3 second timing based on the following equations (1) and (2). The correction duty ratio dn_diff is a value for correcting the duty ratio dn obtained at the same timing so that the detection of the detection 4 can be performed with high precision. Further, A and B in the formulas (1) and (2) are constants obtained by experiments or the like.

Dn_diff=A×dn-dn_x...(1)

Dn_x=(A×d0)-(B×T)...(2)

Next, when the obtained duty ratio dn is greater than or equal to the duty ratio dn-1 obtained at the timing just before (step S46: YES), the control unit 30 increments the first count value E by 1 (+1) (step S47). ). Further, in the third detection, the duty ratio dn initially obtained by the control unit 30 is the above-described reference duty ratio d0. On the other hand, when the obtained duty ratio dn is lower than the duty ratio dn-1 obtained at the timing just before (step S46: No), the control section 30 resets the first count value E to the initial value 0 (zero). (Step S48).

Then, the control unit 30 confirms whether or not the value of the timer 35 is 8.1 seconds or less, that is, whether the measurement time of the timer 35 exceeds 8.1 seconds (step S49).

When the value of the timer 35 is 8.1 seconds or less (step S49: YES), when the load amount of the laundry Q in the dewatering tank 4 is equal to or greater than a predetermined amount (step S50: YES), the control unit 30 determines the latest one. Whether the first count value E is within the range of the detection 3 (step S51). This predetermined amount is obtained in advance by an experiment or the like and stored in the memory 32.

Specifically, the threshold value is set in advance for the first count value E and stored in the memory 32. FIG. 10 is a graph showing the relationship between the time and the first count value E in association with the detection 3. In the graph of Fig. 10, the horizontal axis represents time (unit: sec), and the vertical axis represents the first count value E. Referring to Fig. 10, two threshold values of a lower threshold value indicated by a one-dot chain line and an upper threshold value indicated by a two-dot chain line are set for the threshold value. The upper threshold and the lower threshold are independent of elapsed time and are constant values. The upper threshold is a value higher than the lower threshold.

In the case where the eccentricity is small and the laundry Q is unbiased, since the motor 6 can be stably rotated at 240 rpm even if the voltage is small, the duty ratio dn is gradually decreased. Thereby, the first count value E is stabilized at the vicinity of the initial value 0 (zero) as indicated by the solid line.

However, in the case where the eccentricity is large and the laundry Q is biased, since the high voltage is required to maintain the rotational speed of the motor 6 at 240 rpm, the duty ratio dn does not decrease. Thus, the first count value E does not return to the initial value but increases, as indicated by the broken line, exceeding the lower threshold at any timing. When the bias of the laundry Q is large, the first count value E also exceeds the upper threshold.

Therefore, returning to FIG. 9A, when the latest first count value E is greater than or equal to the lower threshold, the control unit 30 determines that the first count value E is within the range of the detection 3 (step S51: YES). In other words, when the first count value E is equal to or greater than a predetermined threshold value within the predetermined period of 8.1 seconds, the control unit 30 determines that the laundry Q in the dewatering tank 4 is biased.

As long as the configuration in which the duty dn adjacent to the timing is changed is always monitored as in the detection 3, the first duty ratio dn obtained at the start of the detection is a change in the reference duty ratio d0. Small, it is also possible to perform accurate detection of changes in the duty cycle dn in the middle of real-time capture detection. Thereby, the detection accuracy of the presence or absence of the laundry Q can be improved.

Then, when the control unit 30 determines that it is not within the range of the detection 3 by the first count value E being lower than the lower threshold value (step S51: NO), it is determined whether or not the correction duty ratio dn_diff just calculated is in the range of the detection 4 Internal (step S52).

In addition, when the load amount of the laundry Q in the dewatering tank 4 is less than a certain amount (step S50: NO), the control unit 30 does not perform the determination of the detection 3 in the step S51, but performs the detection 4 in the step S52. Judgment. The reason for this is that when the detection 3 is performed with the amount of the laundry Q being less than a certain amount, it is possible that the first count value E is unstable due to the convergence of the duty ratio dn at an early stage, and cannot be stably performed. Test 3. Therefore, in the case where the amount of the laundry Q is less than a certain amount, the detection 3 is omitted.

Regarding the determination as to whether or not the correction duty ratio dn_diff is within the range of the detection 4, a threshold value is set in advance to the correction duty ratio dn_diff, and is stored in the memory 32. FIG. 11 is a graph showing the relationship between the time and the corrected duty ratio dn_diff in association with the detection 4. In the graph of Fig. 11, the horizontal axis represents time (unit: sec), and the vertical axis represents corrected duty ratio dn_diff. Referring to Fig. 11, two threshold values of a lower threshold indicated by a one-dot chain line and an upper threshold indicated by a two-dot chain line are set with respect to the threshold. The upper threshold and the lower threshold are gradually increased according to the elapsed time, respectively. The upper threshold is a value higher than the lower threshold.

In the case where the eccentricity is small and the laundry Q is unbiased, since the motor 6 can be stably rotated at 240 rpm even if the voltage is small, the correction duty ratio dn_diff is lower than the lower threshold and gradually decreases as indicated by the solid line.

However, in the case where the eccentricity is large and the laundry Q is biased, in order to maintain the rotational speed of the motor 6 at 240 rpm, a high voltage is required, so the corrected duty ratio dn_diff does not decrease and exceeds the lower threshold as indicated by a broken line. When the bias of the laundry Q is large, the correction duty ratio dn_diff also exceeds the upper threshold. Therefore, when the correction duty ratio dn_diff is equal to or greater than the lower threshold value, the control unit 30 determines that the correction duty ratio dn_diff is within the range of the detection 4 (step S52: YES).

Further, the correction duty ratio dn_diff obtained by the above equations (1) and (2) is set to be the same as the duty ratio dn is the same as or smaller than the reference duty ratio d0. The value that increases as time passes. Therefore, the correction duty ratio dn_diff is independent of the threshold value only in the case where the duty ratio dn falls normally with respect to the reference duty ratio d0.

As described above, the first count value E for detecting 3 and the correction duty ratio dn_diff for detecting 4 are the voltages applied to the motor 6 in order to maintain 240 rpm for the predetermined period of 8.1 seconds described above. The index of the case where the ratio dn changes with respect to the reference duty ratio d0. In the detection 3 and the detection 4, the control unit 30 determines whether or not the laundry Q in the dewatering tank 4 is biased based on such an index.

Further, since the first count value E for the detection 3 and the correction duty ratio dn_diff for the detection 4 are obtained from the reference duty ratio d0, the reference duty ratio d0 is a detection of whether or not the left and right laundry Q is biased. An important factor in accuracy. In the dehydrator 1, as described above, when the dewatering tank 4 starts to rotate, the control unit 30 measures the load amount of the laundry Q in the dewatering tank 4 (step S2 in FIG. 5A), and determines the acquisition standard based on the measured load amount. The timing of the duty ratio d0 (step S36 of Fig. 6A). Thereby, since the reference duty ratio d0 is obtained at an appropriate timing in consideration of the influence of the load amount, it is possible to accurately perform the discrimination of the laundry Q in the detection 3 and the detection 4 based on the reference duty ratio d0. Detection. As a result, it is possible to improve the detection accuracy of whether or not the laundry Q is biased.

Then, when the control unit 30 determines that the first count value E is within the range of the detection 3 (step S51: YES), or judges that the correction duty ratio dn_diff is within the range of the detection 4 (step S52: YES), the motor 6 is stopped. The rotation (the step S11 described) performs the corresponding processing in the above steps S12 to S18. The processing of steps S40 to S52 is included in the above-described step S20 (refer to FIG. 5A).

Steps S16A and S16B in Fig. 16 are included in the above-described step S16 (refer to Fig. 5B). Specifically, the determination in step S16A corresponds to whether or not the determination is made before the restart in step S16 of FIG. 5B, and the determination in step S16B corresponds to the determination as to whether or not the restart can be performed in step S16 of FIG. 5B.

When the dehydration condition is neither the felt washing process nor the dehydrating operation (step S12: NO), the control unit 30 determines in step S16A whether or not the dehydration operation that was suspended this time is before the restart. When it is determined that it is before the restart (step S16A: YES), the control unit 30 determines whether the bias of the laundry Q is as small as the first count value E and the correction duty ratio dn_diff are smaller than the respective upper thresholds.

In the case of restarting (step S16A: YES), and the first count value E and the correction duty ratio dn_diff are lower than the respective upper thresholds (step S16B: YES), the control unit 30 performs restart (step S17).

In the case where the restart has not been completed before the restart (step S16A: NO), the control unit 30 performs the imbalance correction (step S18). Further, even before restarting (step S16A: YES), when at least one of the first count value E and the correction duty ratio dn_diff is equal to or greater than the respective upper thresholds (step S16B: No), the control unit 30 executes Unbalance correction (step S18).

When the control unit 30 stops the rotation of the dewatering tank 4 in step S11, the control unit 30 determines in the range of the detection 3 and the detection 4 based on the first count value E and the correction duty ratio dn_diff in steps S16B to S18. Whether the bias is small enough to continue to restart, or whether it is too large to require an imbalance correction degree.

That is, the control unit 30 selects either of the execution of the restart and the imbalance correction based on the degree of the first count value E and the correction duty ratio dn_diff, that is, whether or not the values are equal to or greater than the respective upper thresholds. Therefore, when it is judged that the laundry Q is biased, it is not necessary to uniformly perform the imbalance correction. Therefore, when the first count value E and the correction duty ratio dn_diff indicate that the deviation of the laundry Q is small, the time for the dehydration operation can be shortened by immediately performing the restart.

Then, in a state where neither the detection 3 nor the detection 4 judges that the laundry Q is unbiased, when the value of the timer 35 has passed 8.1 seconds (step S49: NO), the control unit 30 ends the detection 3 and the detection 4 ( Step S53).

Next, the detection 5 will be described in detail. Specifically, the detection 5 is divided into detection 5-1 and detection 5-2. FIG. 12 is a flowchart showing an outline of the detection 5-1 and the detection 5-2. Detection 5-1 and detection 5-2 are detections of whether or not the laundry Q using the duty ratio is biased.

Referring to Fig. 12, after the detection 3 and the end of the detection 4, the motor 6 continues to stably rotate for a predetermined time at a rotation speed of 240 rpm. After the predetermined time has elapsed, the control unit 30 accelerates the motor 6 from 240 rpm to the above-described target number of 800 rpm (step S60).

In a state where the motor 6 is accelerated, when the rotational speed of the motor 6 reaches 300 rpm, the control unit 30 takes the duty ratio of the voltage applied to the motor 6 at that time point as the α value (step S61). 300 rpm means that the water is not in the state of being stored in the dewatering tank 4 and is least affected by the eccentricity of the dewatering tank 4 . Therefore, the α value of 300 rpm is the duty ratio in the state which is most affected by the eccentricity of the dewatering tank 4 and is only affected by the load amount of the laundry Q.

Then, the control unit 30 performs the above-described detection 5-1 while the number of revolutions is from 600 pm to 729 rpm in a state where the motor 6 continues to accelerate (step S62). When the detection 6-1 is not OK (step S62: NO), that is, when the control unit 30 determines that the laundry Q is biased, the control unit 30 stops the motor 6 and stops the rotation of the dewatering tank 4 (step S63). In this way, after the dehydration operation is suspended, the control unit 30 determines whether or not it is before the restart, that is, whether or not the dehydration operation that has been suspended this time has been restarted (step S64).

When it is before the restart (step S64: YES), the control section 30 performs a restart (step S65). When it is not before the restart (step S64: No), the control unit 30 performs the imbalance correction (step S66).

On the other hand, when the detection 5-1 is OK (step S62: YES), that is, in the case where the control unit 30 judges that the laundry Q is not biased in the detection 5-1, the motor 6 is from 730 rpm. In the state where the acceleration is continued, the control unit 30 continues the above-described detection 5-2 (step S67).

When the detection 5-2 is OK (step S67: YES), that is, when the control unit 30 determines that the laundry Q is not biased in the detection 5-2, the control unit 30 accelerates the motor 6 to the target. After the rotation speed (800 rpm), the motor 6 is continuously rotated at the target rotation speed to continue the dehydration of the laundry Q (step S68).

On the other hand, when the detection 5-2 is not OK (step S67: NO), that is, when the control unit 30 determines that the laundry Q is biased, the control unit 30 causes the motor 6 to have the above target. The rotation speed below the rotation speed is stably rotated, thereby continuing the dehydration of the laundry Q (step S69).

Next, the detection 5-1 and the detection 5-2 will be described in detail.

FIG. 13 is a flowchart showing a control operation regarding the detection 5-1.

Referring to Fig. 13 , in a state where the acceleration motor 6 is continued in the above-described step S61 (see Fig. 12), the control unit 30 starts the detection 5-1 based on the rotation speed of the motor 6 reaching 600 rpm (step S70).

Then, the control unit 30 starts counting by the counter 36 (step S71), and initializes the counter 36 by pressing every 0.3 seconds, thereby counting every 0.3 seconds (step S72 and step S73).

The control unit 30 acquires the rotation speed of the motor 6 at the time of counting and the duty ratio dn(n: count value) of the voltage applied to the motor 6 at the time of counting (step S74). In other words, the control unit 30 acquires the number of revolutions of the motor 6 and the duty ratio dn for each predetermined timing while the rotational speed of the motor 6 reaches 800 rpm from 240 rpm.

Further, in step S74, the control unit 30 calculates the correction value Bn obtained by correcting the duty ratio dn by the above-described α value based on the following formula (3). Further, X and Y in the formula (3) are constants obtained by experiments or the like. Unlike the simple proportional calculation, the correction value Bn obtained by correcting the duty ratio dn by changing the weight by the equation (3) enables the detection 5-1 to be performed with high precision.

Bn=dn-(α×X+Y)...(3)

Further, in step S74, the control unit 30 calculates the movement integrated value Cn (n: count value) of the correction value Bn. The movement cumulative value Cn (n: count value) is a value obtained by totaling five correction values Bn that are consecutive in the counting order. Further, at a certain movement integrated value Cn and the immediately preceding movement integrated value Cn-1, the rear four correction values Bn and the movement cumulative value Cn of the five correction values Bn constituting the movement integrated value Cn-1 are formed. The four correction values Bn on the front side of the five correction values Bn are the same value, respectively. Further, the number of correction values Bn totaled to constitute the movement integrated value Cn is not limited to the above five.

Next, the control unit 30 calculates a threshold value for the movement integrated value Cn based on the following formula (4) (step S75).

Threshold = (speed) × a + b... equation (4)

a and b in the formula (4) are constants obtained by experiments or the like, and are stored in the memory 32. Further, these constants a and b differ depending on the current rotational speed of the motor 6 and the selected dehydration conditions. Therefore, among the thresholds here, there are a plurality of values at the same rotational speed. Further, according to the formula (4), it is apparent that the threshold value is a value that is not affected by the above-described α value.

Then, the control unit 30 confirms whether or not the current number of revolutions of the motor 6 is less than 730 rpm (step S76).

When the current number of revolutions of the motor 6 is less than 730 rpm (step S76: YES), the control unit 30 determines whether or not the latest movement integrated value Cn is within the range of the detection 5-1 (step S77).

FIG. 14 is a graph showing the relationship between the rotational speed and the movement cumulative value Cn in association with the detection 5-1 and the detection 5-2. In the graph of Fig. 14, the horizontal axis represents the number of revolutions (unit: rpm), and the vertical axis represents the movement cumulative value Cn. Referring to Fig. 14, the threshold value calculated in step S75 is set such that the first threshold value indicated by a one-dot chain line and the second threshold value indicated by a two-dot chain line are set depending on, for example, a dehydration condition. The first threshold is higher than the second threshold.

In the dehydration condition, there is a "water spray dehydration" in which the water is accumulated in the dehydration tank 4, and the dehydration condition of the dehydration operation is performed after the "test rinse" of the rinsed laundry Q, and the water is sprayed and the dehydration operation is performed on the laundry Q. And the above-mentioned "restart" and other dehydration conditions. These dehydration conditions are selected by the user by operating the operation unit 20, and the selection is received by the control unit 30. In the dehydration operation after the washing operation and after the rinsing, since the laundry contains a large amount of water, the acceleration of the motor 6 requires force, and in the case where the water spray is dehydrated and restarted, since the laundry is partially removed from the water, Therefore, the force required for the acceleration of the motor 6 is small.

After the cleaning operation and the dehydration operation after the rinsing, since the strict detection of the second threshold is performed, the control unit 30 uses the first threshold higher than the second threshold. On the other hand, in the dehydration operation of the water spray dehydration and the restart, since the loose detection of the first threshold value is performed, the control unit 30 uses the second threshold value lower than the first threshold value. Therefore, in the case where the laundry Q contains a large amount of water, or in the case where the laundry Q has some water removed, the detection 5-1 is performed using a threshold value appropriate for each case.

Further, based on the same principle as the division of such dehydration conditions, in the case where the load amount of the laundry Q in the dehydration tank 4 is large, in the detection 5-1, the strict detection is performed because of the second threshold value. Therefore, the control unit 30 uses the first threshold higher than the second threshold. Further, in the case where the load amount of the laundry Q in the dewatering tank 4 is small, in the detection 5-1, since the loose detection of the first threshold value is performed, the control unit 30 uses a lower threshold than the first threshold. Second threshold. Therefore, use the negative with the laundry Q separately Detection 5-1 is performed with appropriate thresholds for different loadings.

Further, although the threshold values of the first threshold and the second threshold are exemplified in FIG. 14 , the threshold may be set to three or more types according to various dehydration conditions and load amounts.

Then, when the eccentricity is large and the laundry Q is biased (see the broken line in FIG. 14), the movement cumulative value Cn at each rotation speed is more than that in the case where the eccentricity is small and the laundry Q is not biased (refer to the solid line). Big. When the bias of the laundry Q is large, the movement cumulative value Cn exceeds the set threshold, that is, the corresponding one of the first threshold and the second threshold.

Therefore, when the latest moving integrated value Cn is equal to or greater than the set threshold value, the control unit 30 determines that the moving integrated value Cn is within the range of the detection 5-1 (step S77: YES).

When the control unit 30 determines that the movement integrated value Cn is within the range of the detection 5-1 (YES in step S77), the rotation of the motor 6 is stopped (step S63 described above), and the corresponding processing in steps S64 to S66 described above is executed. The processing of steps S71 to S77 is included in the above-described step S62 (refer to FIG. 12).

Then, when the detection 5-1 determines that the laundry Q is unbiased, when the rotation speed of the motor 6 reaches 730 rpm (step S76: No), the control unit 30 ends the detection 5-1, and then starts the continuation detection 5-2 (step S78). ).

Fig. 15 is a flowchart showing a control operation regarding the detection 5-2.

Referring to Fig. 15, in a state where the acceleration motor 6 is continued, the control unit 30 starts the detection 5-2 as the number of revolutions of the motor 6 reaches 730 rpm (step S78 described above).

Then, the control unit 30 starts counting by the counter 36 (step S79), and initializes the counter 36 by pressing every 0.3 seconds, thereby counting every 0.3 seconds (step S80 and step S81).

Similarly to step S74 in the detection 5-1, the control unit 30 acquires the rotation speed of the motor 6 at the time of counting and the duty ratio dn of the voltage applied to the motor 6 at the time of counting, and calculates the correction value Bn and the movement total. The value Cn (step S82).

Next, the control unit 30 calculates a threshold value for the movement integrated value Cn based on the above formula (4) (step S83). The constants a and b constituting the equation (4) are the same as the detection 5-1, and differ depending on the current number of revolutions of the motor 6 and the selected dehydration conditions. Therefore, among the threshold values herein, there are a plurality of values at the same number of revolutions, as described above for the first threshold and the second threshold.

Then, the control unit 30 confirms whether or not the current number of revolutions of the motor 6 has reached the target number of revolutions (800 rpm) (step S84).

When the current number of revolutions of the motor 6 is smaller than the target number of revolutions (step S84: YES), the control unit 30 determines whether or not the latest moving integrated value Cn is detecting 5-2, similarly to the case of detecting 5-1 (step S77). Within the range (step S85).

Specifically, referring to FIG. 14 , when the eccentricity is large and the laundry Q is biased (see the broken line in FIG. 14 ), compared with the case where the eccentricity is small and the laundry Q is not biased (refer to the solid line), the rotation speed is lower. The moving cumulative value Cn is larger. When the bias of the laundry Q is large, the movement cumulative value Cn exceeds the set threshold, that is, the corresponding one of the first threshold and the second threshold.

Therefore, when the latest moving integrated value Cn is equal to or greater than the set threshold value, the control unit 30 determines that the moving integrated value Cn is within the range of the detection 5-2 (step S85: YES).

When the control unit 30 determines that the movement integrated value Cn is within the range of the detection 5-2 (step S85: YES), the control unit 30 acquires the time point of the determination, that is, the rotation speed L of the motor 6 at the time of detecting the detection of 5-2 (step S86).

Then, the control unit 30 strictly controls the rotational speed L obtained by rounding off the value of the first digit in the rotational speed L to 0 (zero) to cause the motor 6 to rotate at a constant speed, thereby continuing the washing. Dehydration of Q (step S69 described above). At this time, the control unit 30 extends the dehydration time at the rotation speed L so as to obtain the same dehydration effect as when the original target rotation speed is dehydrated.

Then, in a state where the detection 5-2 judges that the laundry Q is unbiased, when the rotation speed of the motor 6 reaches the target rotation speed (step S84: No), the control section 30 ends the detection 5-2, and stabilizes the motor 6 by the target rotation speed. The rotation is continued to continue the dehydration of the laundry Q (step S68 described above).

As described above, in the detection 5-1 and the detection 5-2, the control unit 30 changes the threshold based on the dehydration condition received by the operation unit 20 (steps S75 and S83). When the obtained duty ratio dn is strictly equal to or greater than the predetermined threshold value after the change of the obtained duty ratio dn, the control unit 30 determines that the laundry Q in the dewatering tank 4 is biased. . In other words, in the dehydration operation of each dehydration condition, since the presence or absence of the deviation of the laundry Q can be detected based on the threshold value appropriate for each dehydration condition, the detection accuracy of the presence or absence of the laundry Q can be improved.

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

For example, during the spin-drying operation, particularly during the period in which the number of revolutions of the motor 6 is less than 600 rpm, there is a possibility that air bubbles may block the middle of the drain passage 14 and may not smoothly drain. Therefore, the control unit 30 may perform control for detecting the air bubbles in the drain passage 14 in parallel with the control related to the above-described detections 1 to 5.

Referring to Fig. 16, control unit 30 starts dehydration rotation of dewatering tank 4 by starting dehydration operation (described above) Step S1). Thereby, the number of revolutions of the motor 6 is increased as described above (see FIG. 3).

The control unit 30 acquires the applied voltage duty ratio, which is the duty ratio of the number of revolutions of the motor 6 and the voltage applied to the motor 6, at each predetermined timing in the spin-drying operation (step S91).

When the rotation speed of the motor 6 is lower than 600 rpm (step S92: YES), the control unit 30 calculates the voltage limit value V_limit (step S93). The voltage limit value V_limit is a duty ratio of the maximum voltage applied to the motor 6 at each rotation speed, and is calculated by substituting the rotation speed into a predetermined equation.

Then, the control unit 30 checks whether or not the applied voltage duty obtained in step S91 is equal to or greater than the voltage limit value V_limit at each timing, thereby detecting the air bubbles in the drain passage 14 (step S94).

Specifically, when the air bubbles block the drain passage 14 and cannot be drained, water is stored in the bottom of the dewatering tank 4, and the dewatering tank 4 is prevented from rotating. Therefore, in order to rotate the dewatering tank 4, it is necessary to apply a voltage equivalent to the motor 6. The voltage of the applied voltage duty ratio above the limit value V_limit is limited. Therefore, when the applied voltage duty ratio is equal to or higher than the voltage limit value V_limit, the control unit 30 determines that the air bubble is blocked by the air passage 14 (step S94: YES). On the other hand, when the applied voltage duty ratio is smaller than the voltage limit value V_limit, the control unit 30 determines that the bubble is not in the state of the drain passage 14 (step S94: NO).

When the control unit 30 determines that the air bubble is blocked by the air passage 14 (step S94: YES), it is determined whether or not it is before the restart, that is, whether or not the restart is performed for the dehydration operation that has been suspended this time (step S95).

When it is before the restart (step S95: YES), the control section 30 performs a restart (step S96). When it is not before the restart (step S95: NO), the control section 30 performs the imbalance correction (step S97). Even in the case of performing either the restart or the imbalance correction, the dehydration operation is resumed after the temporary suspension. Therefore, during the recovery of the dehydration operation, the bubbles of the drainage path 14 naturally disappear.

On the other hand, when the number of revolutions of the motor 6 is 600 rpm or more (step S92: No), the control unit 30 ends the process of detecting bubbles (step S98).

Further, the control of Fig. 16 can be used not only for detecting the bubble but also for detecting the phenomenon that the water in the outer tub 3 cannot reach the "water immersion" of the drain passage 14 due to vibration or the like.

In the above embodiment, the premise is that the motor 6 is a variable frequency motor, and the duty ratio is used to control the motor 6. However, in the case where the motor 6 is a brushed motor, the value of the voltage applied to the motor 6 is used instead of the duty ratio. To control the motor 6.

Further, in the above description, specific numerical values such as 120 rpm, 240 rpm, and 800 rpm are used for the number of revolutions, but these specific values are values that vary depending on the performance of the dehydrator 1. In addition, although However, in the above description, the duty ratio may be obtained and used for various determinations. However, the duty ratio may be original data of the obtained duty ratio, or may be a correction value corrected as needed. It may be a value calculated from the duty ratio like the above-described movement integrated value Cn.

Further, although the dewatering tank 4 of the above embodiment is vertically disposed so as to be rotatable about the axis 16 extending in the vertical direction X, the dewatering tank may be disposed obliquely by extending the axis 16 obliquely with respect to the vertical direction X. 4.

Description of the reference numerals

1 dehydrator; 4 dehydration tank; 6 motor; 30 control; dn duty cycle; d0 reference duty cycle; dn_diff correction duty cycle; E first count value; Q washing.

Claims

A dehydrator characterized by comprising:

a dewatering tank for accommodating the laundry and rotating to dehydrate the laundry;

An electric motor that rotates the dewatering tank;

a load amount measuring unit that measures a load amount of the laundry in the dewatering tank when the dewatering tank starts to rotate;

a drive control unit that, after detecting the load amount by the load amount measuring unit, rotates the motor at a first rotation speed by controlling a duty ratio of a voltage applied to the motor, and then The motor rotates at a steady speed at a second rotation speed higher than the first rotation speed to formally dehydrate the laundry;

a obtaining unit that takes a duty ratio of a voltage applied to the motor as a reference duty ratio in an acceleration state in which the motor accelerates to the first rotation speed;

a timing determining unit, determining a timing at which the obtaining unit obtains the reference duty ratio;

The determining unit, after the acquisition unit acquires the reference duty ratio, is duty-free from the reference based on a duty indicating a voltage applied to the motor to maintain the first rotational speed for a predetermined period of time Determining whether or not the laundry in the dewatering tank is biased compared to an indicator of a changed condition;

Stopping the control unit, and stopping the rotation of the dewatering tank when the determining unit determines that the laundry is biased,

The timing determination unit determines a timing at which the acquisition unit acquires the reference duty ratio based on a load amount measured by the load amount measurement unit.
The dehydrator according to claim 1, further comprising: an execution unit that selects one of the following operations based on the index when the stop control unit stops the rotation of the dehydration tank One: a rotation of the dewatering tank for recovering dehydration of the laundry, and a treatment for correcting the bias of the laundry in the dewatering tank.
The dehydrator according to claim 2, wherein

The drive control unit causes the motor to rotate at a constant speed lower than a predetermined speed lower than the first rotation speed before the motor is stably rotated at the first rotation speed,

The execution unit shortens a period in which the motor is stably rotated at the predetermined speed in a case where rotation of the dewatering tank for recovering dehydration of laundry is performed.
A dehydrator characterized by comprising:

a dewatering tank for accommodating the laundry and rotating to dehydrate the laundry;

An electric motor that rotates the dewatering tank;

Driving a control unit to rotate the motor at a first rotational speed by controlling a duty ratio of a voltage applied to the motor, and then causing the motor to be second at a higher than the first rotational speed The rotation speed is rotated at a constant speed to formally dehydrate the laundry;

The acquiring unit acquires the duty ratio for each predetermined timing within a predetermined period after the motor starts to accelerate toward the first rotation speed;

The counting unit increases the count value of the initial value to zero when the duty ratio obtained by the obtaining unit is greater than or equal to the duty ratio just obtained, and the duty ratio obtained by the obtaining unit is smaller than the previous When the duty ratio is obtained, resetting the count value to the initial value;

a determining unit, when the count value is greater than or equal to a predetermined threshold, determining that the laundry is biased in the dewatering tank;

The control unit stops the rotation of the dewatering tank when the determination unit determines that the laundry is biased.
A dehydrator characterized by comprising:

a dewatering tank for accommodating the laundry and rotating to dehydrate the laundry;

An electric motor that rotates the dewatering tank;

Driving a control unit to rotate the motor at a first rotational speed by controlling a duty ratio of a voltage applied to the motor, and then causing the motor to be second at a higher than the first rotational speed The rotation speed is rotated at a constant speed to formally dehydrate the laundry;

The acquiring unit acquires the duty ratio for each predetermined timing during a period before the rotation speed of the motor reaches the second rotation speed from the first rotation speed;

a determining unit, when the duty ratio obtained by the obtaining unit is greater than or equal to a predetermined threshold, determining that the laundry is biased in the dewatering tank;

Stopping the control unit, and stopping the rotation of the dewatering tank if the determining unit determines that the laundry is biased;

a receiving unit that receives a selection of dehydration conditions for the laundry;

The threshold changing unit changes the threshold according to the receiving unit receiving the selected dehydration condition.