JP6753726B2 - How to control the drum-type washing machine - Google Patents

Description

The present invention relates to a method for controlling a washing machine having a dehydrating function.

Some washing machines installed in ordinary households or coin-operated laundry machines have a washing / dehydrating function and a washing / dehydrating / drying function.

A washing machine having a dehydrating function generates vibration and noise due to the bias of the laundry in the drum. Further, if the unevenness of the laundry is large, the eccentricity of the drum during rotation becomes large, and a large torque is required for rotation, so that the dehydration operation cannot be started.

In order to eliminate this, the user stopped the operation of the washing machine and manually eliminated the bias of the laundry.

In order to eliminate such troublesome work, when it is determined that the size of the imbalance, which is the bias of the laundry, is larger than the predetermined value, the centrifugal force becomes smaller than the gravity according to the output timing of the position detecting means. A method has been proposed in which the drum is decelerated until the speed is reached to eliminate the uneven distribution of laundry (see Patent Document 1).

In addition, in order to prevent the occurrence of imbalance in which the laundry is biased toward the front part of the drum during dehydration, the difference in the detected vibration amount is calculated by the acceleration sensors arranged for the front part and the rear part of the drum, and the laundry is washed. It has been proposed to detect an unbalanced state in which an object is biased toward the front part of a drum (see Patent Document 2).

Recently, as described in Patent Document 3, there is also a technique for positively eliminating an unbalanced state of a drum by injecting water into a plurality of balancers evenly provided in the circumferential direction of the drum. Proposed.

Japanese Unexamined Patent Publication No. 9-290089 Japanese Unexamined Patent Publication No. 2009-82558 Japanese Unexamined Patent Publication No. 2016-197

The technique disclosed in Patent Document 1 is such that the centrifugal force is reduced by decelerating the rotation of the drum, and the overlapping laundry is dropped by gravity. However, in this conventional technique, the laundry that is entangled with each other and becomes a lump falls as it is, so that the lump cannot be unraveled. When the drum is rotated in such a state, the imbalance is not resolved, so that the imbalance is detected again and the deceleration of the drum is repeated.

On the other hand, the technique disclosed in Patent Document 2 calculates the difference between the vibration value detected by the front vibration detecting means and the vibration value detected by the rear detecting means when the drum is rotating. Then, when the difference between the vibration values exceeds a preset threshold value, the rotation of the drum is decelerated or stopped.

However, even with this conventional technique, the laundry that is entangled with each other and becomes a lump is still not unraveled and remains in the drum, and is not a fundamental solution for eliminating the imbalance.

Therefore, the technique described in Patent Document 3 is expected to solve problems that could not be solved by the above two patent documents. At present, it is expected that further specific control procedures and specific configurations for positively solving the above-mentioned problems will be provided.

The present invention solves such a conventional problem. According to the present invention, even if the laundry is unevenly distributed in the washing tub, the imbalance of the washing tub can be surely reduced during the dehydration process, and the washing time can be shortened by promptly performing the dehydration step. A method of controlling a washing machine can be provided.

In the present invention, a bottomed tubular drum configured to be rotatable around an axis extending in a horizontal direction or an inclined direction, and three or more are arranged on the inner peripheral surface of the drum along the axial direction of the drum. A hollow baffle, a water receiving unit for injecting water into each of the baffles, an acceleration sensor that detects the vibration of the drum, and an eccentricity in the drum based on the vibration of the drum detected by the acceleration sensor. It is a control method of a drum type washing machine having an eccentricity detecting means for detecting an amount and an eccentric position, and in a dehydration step, the rotation number of the drum is set to a first rotation number lower than the resonance point of the drum. At the time of reaching, the first eccentricity detection step for detecting the eccentricity amount and the eccentricity position and the eccentricity amount detected by the first eccentricity detection step are set to different values depending on the eccentricity position. When it is larger than the first eccentricity threshold, the laundry stirring step of lowering the rotation speed of the drum or stopping the rotation of the drum to stir the laundry in the drum up and down in the drum. If the eccentricity detected by the first eccentricity detection step is equal to or less than the first eccentricity threshold, the rotation speed of the drum is increased beyond the resonance point and the eccentricity amount is increased. The second eccentricity detection step for continuously detecting the eccentric position and the eccentricity amount detected by the second eccentricity detection step are set to different values depending on the rotation speed of the drum. When the core amount threshold is equal to or higher than the core amount threshold, the water injection step of injecting water into the baffle while keeping the drum rotation speed substantially constant, and the rotation speed increase threshold in which the eccentric amount is set to a value different depending on the drum rotation speed by the water injection step. When the following, the drum has a rotation speed increasing step of stopping water injection and increasing the rotation speed of the drum, and the second eccentricity detecting step, the water injection step, and the rotation speed increasing step of the drum. It is a control method of a drum type washing machine characterized in that the rotation speed reaches a predetermined dehydration steady rotation speed.

Further, the present invention is characterized in that the first eccentricity threshold value is set to be the largest when the eccentricity position faces the baffle.

Further, in the present invention, when it is determined that the eccentric position is in the opposite load state, the first eccentricity threshold value is higher than the value set when the eccentric position is not in the opposite load state. It is characterized by being set to a low value.

Further, in the present invention, the acceleration sensor can detect accelerations in the left-right direction, the up-down direction, and the front-back direction, respectively, and the first eccentricity amount threshold is set for each acceleration in the left-right direction, the up-down direction, and the front-back direction. It is characterized in that it is set to a different value.

Further, the present invention is characterized in that the difference between the water injection eccentricity threshold value and the rotation speed increase threshold value is set so as to gradually or gradually decrease as the rotation speed increases.

Further, the present invention is characterized in that the difference between the water injection eccentricity threshold value and the rotation speed increase threshold value is set to gradually or gradually increase as the eccentricity amount increases.

According to the present invention, the eccentricity caused by the bias of the laundry is quickly eliminated, so that the normal dehydration process can be stably continued without decelerating or stopping the rotation of the washing tub in the middle. , It is possible to shorten the time of the dehydration process by optimizing the water injection timing and water injection time.

In the control method of the washing machine of the present invention, by setting a large first threshold value for the eccentric position where it is easy to eliminate the eccentricity by injecting water into the baffle, the effect of injecting water into the baffle is further utilized for dehydration operation. It can be continued more stably.

In the control method of the washing machine of the present invention, the eccentricity is not eliminated even if water is injected for a long time by setting the first threshold value low when the opposite load is difficult to eliminate the eccentricity by injecting water into the baffle. It is possible to effectively avoid the problem of wasting time.

Since the control method of the washing machine of the present invention sets a different first threshold value for each vibration direction detected by the acceleration sensor, it is possible to inject a more accurate amount of water.

The washing machine control method of the present invention enables stable and accurate water injection regardless of the rotation speed of the drum.

The washing machine control method of the present invention enables stable and accurate water injection regardless of the amount of eccentricity applied to the drum.

It is a figure which shows typically the cross section of the washing machine 1 which concerns on one Embodiment of this invention. It is an electric block diagram of the washing machine 1. It is a figure for demonstrating the flow of control in the dehydration process of the washing machine 1. It is a parameter table which shows the water supply valve 62 to open. It is a schematic diagram which shows the eccentric position in drum 2. It is a schematic diagram which shows the state which the inside of a drum 2 is under an opposed load. It is a graph which shows the outline of the dehydration process of the washing machine 1 of this embodiment. It is a flowchart which shows the flow of control in the dehydration process of the washing machine 1. It is a flowchart which shows the eccentric position adjustment processing. Dehydration is a schematic flowchart showing this step. It is a flowchart which shows this dehydration process. It is a graph which showed the relationship between the acceleration obtained from the acceleration sensor 12 and the pulse signal ps obtained from a proximity switch 14. It is a flowchart which shows the process of eccentricity amount / temporary eccentricity position measurement. It is a flowchart which shows the process of determining the maximum value and the minimum value. It is a schematic flowchart which shows the process of a start-up determination. It is a specific flowchart which shows the process of a start-up determination. It is a schematic flowchart which shows the process of a water injection process. It is a concrete flowchart which shows the process of a water injection process. It is a flowchart which shows the process of formal determination of an eccentric position. It is a figure for demonstrating the flow of control in the dehydration process of the washing machine 1. It is a flowchart which shows the process of water injection of the washing machine 1. It is a flowchart which shows the specific process of driving a water supply valve. It is a flowchart which shows the specific process of water supply amount determination. It is a flowchart which shows the process of eccentricity increase determination. It is a flowchart which shows the process of the acceleration possibility determination. It is a flowchart which shows the process of change of acceleration determination.

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

FIG. 1 is a schematic cross-sectional view showing the configuration of the washing machine 1 of the present embodiment. FIG. 2 is a functional block diagram showing an electrical configuration of the washing machine 1 of the present embodiment.

The washing machine 1 of the present embodiment can be suitably used in, for example, a coin laundry or a home, and includes a washing machine main body 1a, an outer tub 3 having an axis line S1 extending substantially horizontally, and a drum 2. It is provided with a washing tub 1b, a water injection device 1c having a water receiving unit 5 and a nozzle unit 6, a driving device 40, and a control means 30 shown only in FIG.

The washing machine main body 1a shown in FIG. 1 has a substantially rectangular parallelepiped shape. An opening 11 for taking in and out laundry is formed in the front surface 10a of the washing machine main body 1a, and an opening / closing lid 11a capable of opening / closing the opening 11 is attached. As shown in the figure, the front surface 10a of the washing machine main body 1a faces slightly upward, so that an opening 11 for loading and unloading laundry with respect to the drum 2 is formed so as to face diagonally upward. The opening / closing lid 11a capable of opening / closing the opening 11 is opened / closed by the user from diagonally above. That is, the washing machine 1 according to the present embodiment is a so-called diagonal drum type fully automatic washing machine in which the washing tub 1b is attached in an oblique direction.

The outer tub 3 is a bottomed tubular member arranged inside the washing machine main body 1a, and can store washing water inside. As shown in FIG. 1, an acceleration sensor 12 capable of detecting acceleration in three directions of the left-right direction, the up-down direction, and the front-rear direction is attached to the outer peripheral surface 3a of the outer tank 3.

The drum 2 is a bottomed tubular member that is arranged coaxially with the outer tank 3 in the outer tank 3 and is rotatably supported. The drum 2 can accommodate laundry inside, and has a large number of water passage holes 2b (see FIG. 1) on its wall surface 2a.

As shown in FIG. 1, the drive device 40 is driven by the drum 2 by rotating the pulleys 15 and 15 and the belt 15b by the motor 10 and rotating the drive shaft 17 extending toward the bottom 2c of the drum 2. A force is applied to rotate the drum 2. Further, in the vicinity of one of the pulleys 15, a proximity switch 14 capable of detecting the passage of the mark 15a formed on the pulley 15 is provided. Then, in the present embodiment, the proximity switch 14 corresponds to the drum position detecting device.

As shown in FIG. 1, three baffles 7 as hollow balancers are provided on the inner peripheral surface 2a1 of the drum 2 at equal intervals (equal angles) in the circumferential direction. Each baffle 7 extends from the base end portion 2c of the drum 2 to the tip end portion in the axial direction of the drum 2, and is formed so as to project from the inner peripheral surface 2a1 of the drum 2 toward the axis S1. Further, each baffle 7 is hollow.

The water receiving unit 5 is configured such that the water guiding gutter 5a is radially three-layered along the axis S1 of the drum 2, and is fixed to the inner peripheral surface 2a1 of the drum 2 as shown in FIG. .. The number of water guide gutters 5a is the same as that of the baffles 7, and a water passage path through which the adjusting water W can flow independently is formed inside the baffles 7. Then, as shown in FIG. 1, a communication member 5a1 is connected to the inside of the baffle 7, and the adjusting water W is supplied from the water receiving unit 5.

Such a water receiving unit 5 and a baffle 7 are each connected by a communication member 5a1.

The nozzle unit 6 individually injects the adjusting water W into the water guiding gutter 5a. The nozzle unit 6 has three water injection nozzles 6a and water supply valves 62a, 62b, 62c connected to these water injection nozzles 6a, respectively. The number of water injection nozzles 6a is the same as that of the water guides 5a, and the water injection nozzles 6a are arranged at positions where water can be injected into the separate water guides 5a. In this embodiment, tap water is used as the adjusting water W. Further, as the water supply valves 62a, 62b and 62c, it is also possible to adopt a direction switching water supply valve.

With such a configuration, in the dehydration step in which the drain valve 50a is opened and the washing water in the outer tub 3 is discharged from the drain port 50, the water receiving unit 5 is discharged from the water injection nozzle 6a of any of the nozzle units 6. The adjusting water W injected into the water guide gutter 5a flows into the baffle 7 via the communication member 5a1. For example, when the adjusting water W is injected from any of the water injection nozzles 6a, the adjusting water W flows from the water guiding gutter 5a into the baffle 7 via the communication member 5a1 as shown by an arrow in FIG.

The baffle 7 has a retention portion 71 in which the adjusting water W injected from the tip 1d side of the washing tub 1b by the water injection device 1c stays due to centrifugal force during the dehydration step, and the adjusted water W injected into the washing tub 1b at the base end of the washing tub 1b. It has an outlet portion 72 that can be discharged from the 1e side. When the drum 2 is in a high-speed rotation state, the adjusting water W that has flowed into the baffle 7 sticks to the inner peripheral surface 2a1 of the drum 2 due to centrifugal force and stays there. As a result, the weight of the baffle 7 increases, and the eccentricity (M) of the drum 2 changes. As described above, the baffle 7 has a pocket baffle structure capable of storing the adjusting water W by centrifugal force. Then, when the rotation speed of the drum 2 decreases near the end of the dehydration process, the centrifugal force in the baffle 7 gradually attenuates, and the adjusting water W flows out from the outlet portion 72 due to gravity and is drained to the outside of the outer tank 3. .. At this time, the adjusting water W flows to the lower outside of the drum 2 through the outlet portion 72. Therefore, the adjusting water W is drained without wetting the clothes in the drum 2.

FIG. 2 is a block diagram showing an electrical configuration of the washing machine 1 of the present embodiment. The operation of the washing machine 1 is controlled by a control means 30 including a microcomputer. The control means 30 includes a central control unit (CPU) 31 that controls the entire system, and the control means 30 has a predetermined rotation speed lower than the resonance point CP of the drum 2, which is a value detailed below. The first rotation speed (N1), the first eccentricity threshold value (ma), the eccentricity amount threshold value for water injection (mb), the rotation speed increase threshold value (mc), the eccentricity amount allowable threshold value (md), and the like. A memory 32 in which the constant dehydration rotation speed is stored is connected. Further, when the microcomputer executes the program stored in the memory 32 by the control means 30, a predetermined operation operation is performed, and the memory 32 contains data and the like used when executing the program. Is temporarily memorized.

The central control unit 31 outputs a control signal to the rotation speed control unit 33, and further outputs the control signal to the motor control unit (motor control circuit) 34 to control the rotation of the motor 10. The rotation speed control unit 33 inputs a signal indicating the rotation speed of the motor 10 from the motor control unit 34 in real time to serve as a control element.

An acceleration sensor 12 is connected to the unbalance amount detection unit 35. An acceleration sensor 12 and a proximity switch 14 are connected to the unbalanced position detection unit 36. The unbalanced amount detecting unit 35 and the unbalanced position detecting unit 36 constitute an eccentricity detecting means.

As a result, when the proximity switch 14 detects the marker 15a (see FIG. 1), the unbalance amount detection unit 35 of the drum 2 determines the magnitude of the acceleration in the left-right direction, the up-down direction, and the front-back direction obtained from the acceleration sensor 12. The eccentric amount (M) is calculated, and this eccentric amount (M) is output to the unbalance amount determination unit 37.

The unbalanced position detection unit 36 calculates the angle in the unbalanced direction from the signal indicating the position of the marker 15a input from the proximity switch 14, and sends the unbalanced position signal, which is the eccentric position (N), to the water injection control unit 38. Output. Here, the angle in the unbalanced direction is a relative angle with respect to the baffle 7 in the circumferential direction of the axis S1. In the present embodiment, as an example as shown in FIG. 5, three baffles 7 (A), 7 (B), 7 (C) arranged at equal angular intervals about the axis S1 are relative to the eccentric position. The intermediate position between the baffles 7 (B) and 7 (C) is set to 0 ° to indicate the angle.

When the signals indicating the eccentric amount (M) and the eccentric position (N) are input from the unbalance amount determination unit 37 and the unbalance position detection unit 36, the water injection control unit 38 is stored in the control program in advance. Based on this, the baffle 7 to be supplied and the amount of water supplied are determined. Then, the water injection control unit 38 opens the selected water supply valves 62a, 62b, 62c and starts injecting the adjusting water W. When the water injection control unit 38 has an eccentricity (M) equal to or greater than a predetermined reference value on the drum 2, the water injection control unit 38 conducts water from the water injection unit 5 from the water injection nozzle 6a selected based on the calculation of the eccentricity (M). The injection of the adjusting water W into the gutter 5a is started, and when the eccentricity (M) becomes equal to or less than a predetermined reference, the injection of the adjusting water W is stopped.

In the water injection control unit 38, for example, as shown in FIG. 3, the laundry mass LD (X), which is a factor of eccentricity, is between the baffle 7 (B) and the baffle 7 (C) of the drum 2. If there is, the baffle 7 (A) is controlled to supply the adjusting water W. When the laundry mass LD (Y) is in the vicinity of the baffle 7 (A), the adjusting water W is controlled to be supplied to both the baffle 7 (B) and the baffle 7 (C).

In the present embodiment, as in the case where the laundry mass LD (Y) is in the vicinity of any of the baffles 7, water must be injected into the plurality of baffles 7 in order to reduce the eccentricity (M). Control will be described in detail.

The central control unit 31 opens the water supply valve X and the water supply valve Z as described in the parameter table of FIG. In the present embodiment, as shown in FIG. 5, the eccentric position (N) is specified by dividing the drum 2 into six equal parts in the circumferential direction to specify the baffle 7 to be injected with water. The case is divided into N) and an eccentric position (N) that specifies two baffles 7 to be injected with water. Here, the description "eccentric position (N)" in the present embodiment is a concept indicating either or both of the temporarily calculated temporary eccentric position θ1 and the officially determined eccentric position θ2. The temporary eccentric position θ1 and the formal eccentric position θ2 will be described in detail later.

The region Y of the eccentric position (N) that specifies one baffle 7 to be injected with water is the regions (P (A)), (P (B)) and (P (C)). Further, the region Y of the eccentric position (N) required for eliminating the eccentricity is a region (P (AB)), (P (BC)) and (P (CA)). Further, the angles of the regions (P (A)), (P (B)) and (P (C)) about the axis S1 are 20 °, and the regions (P (AB)), (P (BC)) and The angle about the axis S1 of (P (CA)) is set to 100 °.

In addition, the baffle 7 corresponding to the character not described in ABC is the baffle 7 closest to the eccentric position (N) in the present embodiment.

Further, in the present embodiment, the acceleration sensor 12 is a three-axis sensor capable of detecting acceleration in the left-right direction, the up-down direction, and the front-back direction. As a result, even in a state where the laundry as shown in FIG. 6 is positioned so as to face the base end side and the tip end side of the drum 2 (opposed load state), the eccentric position (N) and The amount of eccentricity (M) can be detected. The method for detecting the eccentric position (N) and the eccentric amount (M) in the state of facing loads will be described in detail later.

In the control method of the washing machine 1 according to the present embodiment, when the rotation speed of the drum 2 reaches the first rotation speed (N1) lower than the resonance point CP of the drum 2, the eccentricity (M) and the provisional The first eccentricity detection step for detecting the eccentric position θ1 and the eccentricity amount (M) detected by the first eccentricity detection step are set to different values depending on the temporary eccentricity position θ1. When it is larger than the core amount threshold (ma), the laundry in the drum 2 is stirred up and down in the drum 2 by lowering the rotation speed of the drum 2 or stopping the rotation of the drum 2, and then the first It has a laundry stirring step that raises the rotation speed of the drum 2 up to the rotation speed (N1) of.

FIG. 7 is a graph showing an outline of the dehydration process of the washing machine 1 of the present embodiment. In FIG. 7, the vertical axis represents the number of rotations of the drum 2, and the horizontal axis represents time. 8, 10 and 11 are flowcharts showing the main outline of the dehydration process. FIG. 8 shows a pre-dehydration step related to the first half of the dehydration step, and FIGS. 10 and 11 show a dehydration main step which is a step after the pre-dehydration step.

In the present embodiment, when the central control unit 31 receives an input signal from a dehydration button (not shown) or a signal that the dehydration step should be started during the washing course operation, the process proceeds to step SP1 and the pre-dehydration step is started.

<Step SP1>

In step SP1, the central control unit 31 loosens and inverts the drum 2, and then raises the rotation of the drum 2 to the first rotation speed (N1) lower than the resonance point CP of the drum 2. When the rotation speed of the drum 2 reaches the first rotation speed (N1), the process proceeds to step SP2. In this embodiment, the first rotation speed (N1) is set to 180 rpm, which is lower than the resonance point CP of the drum 2, which is about 300 rpm.

<Step SP2>

In step SP2, the central control unit 31 causes the eccentricity detecting means to calculate the eccentricity amount (M) and the temporary eccentricity position θ1 based on the acceleration signal given from the acceleration sensor 12, and the eccentricity according to the present embodiment. Controls quantity / temporary eccentricity position measurement. More specifically, the control of the eccentricity amount / temporary eccentricity position measurement, which is step SP2 in FIG. 8, corresponds to the first eccentricity detection step according to the present invention. At this time, the central control unit 31 causes the central control unit 31 to calculate the eccentricity amount (M) in each direction based on the acceleration signals related to the left-right direction, the up-down direction, and the front-back direction obtained from the acceleration sensor 12, for example. The value adopted for this control is based on the eccentricity (M) in the front-rear direction and the acceleration signal in any one of the up-down direction and the left-right direction among the calculated values in the three directions. It is the eccentricity amount (M) calculated in 1.

<Step SP3>

The central control unit 31 compares the calculated eccentric amount (M) with the first eccentric amount threshold value (ma) stored in the memory 32, and determines whether or not M <ma holds. Make a raise judgment. If the central control unit 31 determines that M <ma holds, the process proceeds to step SP4, and if it determines that M <ma does not hold, the central control unit 31 proceeds to step SP5. Here, the first eccentricity threshold value (ma) is the eccentricity amount (M) to the extent that the rotation speed of the drum 2 can be increased up to the steady dehydration rotation speed even if the adjusting water W is supplied to the baffle 7. This threshold value is based on the assumption that the bias of the laundry is so large that it is difficult to reduce it. That is, when proceeding to step SP5, it means that the amount of eccentricity (M) is so large that it is difficult to complete the dehydration step even if the adjusting water W is supplied to the baffle 7.

The first eccentricity threshold (ma) will be further described. In the present embodiment, the acceleration sensor 12 is applied so that it can detect acceleration in the left-right direction, the up-down direction, and the front-back direction, respectively. Then, different first eccentricity threshold values (ma_x, ma_z, ma_y) are set for each of the acceleration signals in the left-right direction, the up-down direction, and the front-back direction.

<Step SP4>

In step SP4, when the eccentric amount (M) calculated in step SP2 is smaller than the first eccentric amount threshold value (ma) set for each eccentric position, the central control unit 31 of the drum 2 Increase the number of revolutions. Further, the central control unit 31 continuously controls the eccentricity amount / temporary eccentricity position measurement according to the present embodiment while increasing the rotation speed of the drum 2. Here, "continuously" is not necessarily limited to a mode in which it is performed continuously and continuously. A mode in which control of eccentricity amount / temporary eccentricity position measurement according to the present embodiment is intermittently executed when the rotation speed of the drum 2 rises to an arbitrary plurality of rotation speeds up to the dehydration steady rotation speed. Of course, it is good. This step SP4 corresponds to the second eccentricity detection step according to the present invention.

In step SP5, the central control unit 31 stops the rotation of the drum 2 or lowers the rotation speed of the drum 2 to a rotation speed in which gravity exceeds the centrifugal force, thereby moving the laundry in the drum 2 in the vertical direction. The eccentric position adjustment process of stirring is controlled. After that, the process returns to step SP1. Step SP5 corresponds to the laundry stirring step according to the present invention. In FIG. 7, the behavior of the rotation speed when the rotation speed of the drum 2 reaches the dehydration steady rotation speed without injecting water into the baffle 7 is shown by a solid line. Further, in FIG. 7, the behavior of the rotation speed when the rotation speed reaches the dehydration steady rotation speed after pouring water into the baffle 7 only once is shown by the upper imaginary line, and the behavior of the rotation speed of the drum 2 according to step SP5. Is shown by the lower imaginary line.

The control of the eccentric position adjusting process will be further described with reference to FIG. First, when it is determined by step SP3 that the amount of eccentricity (M) is large enough to be difficult to reduce, the rotation of the drum 2 is stopped (step SP51). After that, the drum 2 is rotated at a rotation speed lower than the centrifugal force, the laundry in the drum 2 is agitated, and the eccentricity amount (M) is changed (step SP52).

Hereinafter, the control related to the dehydration main step after step SP4 will be schematically shown in FIG. 10 and specifically shown in FIG.

<Step SP6>

In step SP6, the central control unit 31 has an eccentricity amount (M) calculated in step SP2 shown in FIG. 8 set in advance for each rotation speed of the drum 2 to be a water injection eccentricity amount threshold value (mb). It is determined whether or not it is larger than. When the eccentric amount (M) is lower than the water injection eccentric amount threshold value (mb), the central control unit 31 shifts to step SP7 without injecting water into the baffle 7. When the eccentric amount (M) is larger than the eccentric amount threshold value (mb) for water injection, the central control unit 31 shifts to SP7 after injecting water into the baffle 7 in the water injection step.

<Step SP7>

In step SP7, the central control unit 31 raises the rotation speed of the drum 2 at a predetermined acceleration.

<Step SP8>

In step SP8, when the rotation speed of the drum 2 reaches the steady dehydration rotation speed, the central control unit 31 maintains the rotation speed of the drum 2 as it is until the end of the dehydration step. In this embodiment, the steady dehydration speed is set to 800 rpm.

FIG. 11 is a flowchart showing a specific process of the dehydration main step according to the present embodiment.

<Step SP71>

In step SP71, the central control unit 31 increases the rotation speed by 20 rpm per second until the rotation speed of the drum 2 reaches 400 rpm. The central control unit 31 executes step SP6 in parallel while performing step SP71.
<Step SP72>

In step SP72, the central control unit 31 determines whether or not the rotation speed of the drum 2 has reached 400 rpm. If the rotation speed has not reached 400 rpm, the central control unit 31 proceeds to step SP71. If the rotation speed reaches 400 rpm, the central control unit 31 shifts to step SP73.
<Step SP73>

In step SP72, the central control unit 31 increases the rotation speed by 5 rpm per second until the rotation speed of the drum 2 reaches 600 rpm. The central control unit 31 executes step SP6 in parallel while performing step SP72.
<Step SP74>

In step SP74, the central control unit 31 determines whether or not the rotation speed of the drum 2 has reached 600 rpm. If the rotation speed has not reached 600 rpm, the central control unit 31 proceeds to step SP73. If the rotation speed reaches 600 rpm, the central control unit 31 shifts to step SP75. Here, the acceleration when the rotation speed of the drum 2 rises to 400 to 600 rpm is lower than that of other rotation ranges because the amount of water dehydrated from the laundry is larger in the rotation range than in other rotation ranges. This is to reduce unnecessary noise caused by dehydrated water.
<Step SP75>

In step SP72, the central control unit 31 increases the rotation speed by 20 rpm per second until the rotation speed of the drum 2 reaches 800 rpm. The central control unit 31 executes step SP6 in parallel while performing step SP72.
<Step SP76>

In step SP76, the central control unit 31 determines whether or not the rotation speed of the drum 2 has reached 800 rpm. If the rotation speed has not reached 800 rpm, the central control unit 31 shifts to step SP75. If the rotation speed reaches 800 rpm, the central control unit 31 shifts to step SP8.

<Step SP8>

In step SP8, when the rotation speed of the drum 2 reaches 800 rpm, which is the steady dehydration rotation speed, the central control unit 31 continues the dehydration process as it is, and after confirming that a predetermined time has elapsed, washing is performed. finish. In other words, the central control unit 31 rotates the drum 2 at a steady dehydration speed for a predetermined time to perform the dehydration process, as in the dehydration step in normal washing. After that, the dehydration process is completed. Then, when the dehydration is completed, the deceleration of the drum 2 is started, and the centrifugal force is lower than the gravitational acceleration, the adjusting water W in the baffle 7 flows out and is drained.

In the control method according to the present embodiment, after step SP3 which is the second eccentricity detection step, the rotation speed of the drum 2 is the steady dehydration rotation speed in step SP6 which is a water injection step and step SP7 which is a rotation speed increase step. It is repeated until.

Subsequently, a specific aspect of the control method according to the present embodiment will be further described.

The procedure for calculating the temporary eccentric position θ1 in the present embodiment will be described. In the present embodiment, in the dehydration step, the time difference t1 between an arbitrary time point in the signal related to the acceleration indicating at least one cycle t2 of the drum 2 transmitted from the acceleration sensor 12 and the timing when the pulse signal ps is transmitted from the proximity switch 14. Is calculated, the temporary eccentric position θ1 in the circumferential direction in the drum 2 is calculated from the relationship between the time difference t1 and the rotation speed of the drum 2, and the eccentric amount (M) is calculated based on the calculated temporary eccentric position θ1. It is characterized in that control for reduction is performed, and one of the signals from the acceleration sensor 12 in a plurality of directions including at least the front-rear direction is used for calculating the temporary eccentric position θ1. Hereinafter, a specific procedure for calculating the temporary eccentric position θ1 according to the present embodiment will be described with reference to FIGS. 12 to 14.

FIG. 12 is a graph showing the relationship between the information indicating the time change of the acceleration calculated based on the acceleration and the pulse signal ps obtained from the proximity switch 14. In FIG. 12, for convenience, the temporary eccentric position θ1 is calculated from the time difference t1 between the maximum value (Ymax) of the acceleration in the front-rear direction obtained from the acceleration sensor 12 and the pulse signal ps. In the present embodiment shown in FIG. 12, as an example, a mode of calculating the temporary eccentric position θ1 from the maximum value (Ymax) and the minimum value (Ymin) of the acceleration is shown, but as another embodiment of the present invention, the acceleration The temporary eccentric position θ1 may be calculated from any one or more of the zero point, the maximum value of acceleration (Ymax), and the minimum value (Ymin).

FIG. 13 is a flowchart showing a process of measuring the eccentricity amount / temporary eccentricity position.

<Step SP21>

In step SP31, the central control unit 31 detects accelerations (X, Y, Z) in the left-right direction, the front-back direction, and the up-down direction from the acceleration sensor 12.

<Step SP22>

In step SP22, the central control unit 31 maximizes the acceleration (X, Y, Z) from the acceleration (X, Y, Z) obtained from the acceleration sensor 12 and the pulse signal ps which is an interrupt signal from the proximity switch 14. A calculation process is performed to determine the value (XmaxYmax, Zmax) and the minimum value (Xmin, Ymin, Zmin). A specific embodiment will be described later.

<Step SP23>

In step SP23, the central control unit 31 calculates and determines the value of one cycle t2, which is the time for one rotation of the drum 2, from the interval between the plurality of pulse signals ps which are interrupt signals from the proximity switch 14.

<Step SP24>

In step SP24, the central control unit 31 uses a plurality of pulse signals ps which are interrupt signals from the proximity switch 14 and maximum values (Xmax, Ymax, Zmax) of accelerations (X, Y, Z) obtained from step SP22. , The time difference t1 is calculated and determined. In step SP24, the central control unit 31 also calculates the time differences t1_X and t1_Z in the left-right direction and the up-down direction in addition to the time difference t1_Y which is the time difference t1 in the front-rear direction shown in FIG.

<Step SP25>

In step SP25, the central control unit 31 determines the amount of eccentricity (Xmin, Ymin, Zmin) from the maximum value (Xmax, Ymax, Zmax) and the minimum value (Xmin, Ymin, Zmin) of the acceleration (X, Y, Z) obtained from step SP22. The eccentricity Mx, My, and Mz corresponding to each of the left-right direction, the front-back direction, and the up-down direction, which are M), are calculated and determined. The eccentricity Mx, My, Mz is obtained from the difference between the maximum value (Xmax, Ymax, Zmax) and the minimum value (Xmin, Ymin, Zmin) in this embodiment.

<Step SP26>

In step SP26, the central control unit 31 uses the temporary eccentric positions θ1-X and θ1 related to the horizontal direction, the front-rear direction, and the vertical direction from the one cycle t2 obtained from step SP23 and the time difference t1 obtained from step SP24. -Y and θ1-Z are calculated and determined by the following formula.
θ1-X = t1_X × 360 ÷ t2
θ1-Y = t1_Y × 360 ÷ t2
θ1-Z = t1_Z × 360 ÷ t2

FIG. 14 is a flowchart specifically showing a calculation process for determining a maximum value (Xmax, Ymax, Zmax) and a minimum value (Xmin, Ymin, Zmin) of acceleration (X, Y, Z). The values of acceleration (X, Y, Z) actually input from the acceleration sensor are input every 1 millisecond, but finer undulations are shown for each input value while showing rough undulations that repeat from maximum to minimum. Tends to repeat. Therefore, in the present embodiment, the central control unit 31 performs the calculation process by using the moving average value of these plurality of input values as the acceleration (X1, Y1, Z1) used in the calculation process. As a result, the influence of the fine undulations on the calculation process by the central control unit 31 is reduced.

<Step SP221>

In step SP221, the central control unit 31 calculates the 16 moving averages of the input accelerations (X, Y, Z) twice in parallel, and accelerates the moving averages obtained every 16 milliseconds. Recognize as (X1, Y1, Z1) and input continuously. Specifically, as an example, the central control unit 31 calculates and inputs the moving average value from the 1st to 16th and 17th to 32nd input values, and the 2nd to 17th and 18th to 32nd input values are input. The moving average value is also calculated from the input value as the second value. As a result, either the first or second moving average value can be used for the calculation process. Specifically, for example, even if the moving average value from the 1st to 16th input values cannot be calculated for some reason, the moving average value can be calculated from the 2nd to 17th input values as an alternative and used for the calculation process. ..

<Step SP222>

In step SP222, the central control unit 31 receives the input of the pulse signal ps obtained from the proximity switch 14.

<Step SP223>

In step SP222, the central control unit 31 updates the tentative maximum and minimum values of the accelerations (X1, Y1, Z1) continuously input by step SP221 at any time.

<Step SP224>

In step SP224, the central control unit 31 receives the pulse signal ps next to the pulse signal ps obtained from step SP222 obtained from the proximity switch 14.

<Step SP225>

In step SP225, the central control unit 31 sets the maximum and minimum values of the accelerations (X1, Y1, Z1) obtained between the pulse signals ps by step SP222 and step SP224 to the determined accelerations (X, Y, Z). ) Is the maximum value (Xmax, Ymax, Zmax) and the minimum value (Xmin, Ymin, Zmin).

FIG. 15 is a flowchart showing an embodiment of the start-up determination, and FIG. 16 is a flowchart showing another embodiment of the start-up determination. The start-up determination will be described below.

<Step SP31>

In step SP31, the central control unit 31 selects an eccentric amount (M) showing a larger value from the left-right eccentric amount Mx and the vertical eccentric amount Mz determined by step SP25. In the present embodiment, for convenience of explanation, the selected eccentric amount (M) is referred to as eccentric amount Mxz.

<Step SP32>

In step SP32, the central control unit 31 determines whether or not the eccentric amount Mxz exceeds the threshold value M_xz which is the first eccentric amount threshold value (ma). If the eccentric amount Mxz is less than the threshold value M_xz, the central control unit 31 shifts to step SP33. If the eccentric amount Mxz exceeds the threshold value M_xz, the central control unit 31 determines that the start-up is impossible, proceeds to step SP5, and performs the eccentric amount adjustment process.

<Step SP33>

In step SP33, the central control unit 31 determines whether or not the eccentric amount My in the front-rear direction exceeds the threshold M_y, which is the first eccentric amount threshold (ma). The central control unit 31 determines that the start-up is possible if the eccentricity amount My is less than the threshold value M_y. In this case, the rotation speed of the drum 2 is increased. If the eccentricity amount My exceeds the threshold value M_y, the central control unit 31 determines that the start-up is impossible, and proceeds to step SP5 to perform the eccentricity amount adjustment process.

Next, another embodiment of the start-up determination will be described with reference to FIG. In the present embodiment, the central control unit 31 makes a start-up determination by appropriately differentiating the threshold values M_xz and the threshold value M_y used for the start-up determination depending on the eccentric state of the drum 2.

In the present embodiment, with respect to step SP3, which is the first eccentricity detection step, the first eccentricity threshold value (ma) is not set to the opposite load state when the opposite load state is shown in FIG. Set to a value smaller than when. Further, in the present embodiment, the first eccentric amount threshold value (ma) is set differently according to the temporary eccentric position θ1 when the load is not opposed.

The central control unit 31 selectively selects the threshold value M_xz1, the threshold value M_y1, the threshold value M_xz2, the threshold value M_y2, the threshold value M_xz3, and the threshold value M_y3 stored in the memory 32 as the first eccentricity threshold value (ma) used in the present embodiment. Read to. Among these threshold values, the threshold value M_xz1 and the threshold value M_y1 are the largest values, and the threshold value M_xz3 and the threshold value M_y3 are the lowest values.

The start-up determination shown in FIG. 16 will be described. The central control unit 31 performs the process of step SP31 described above. After that, the process proceeds to step SP34.

<Step SP34>

In step SP34, the central control unit 31 determines whether or not the value of the eccentric amount Mxz selected in step SP31 is smaller than the eccentric amount My related to the front-rear direction. If the value of the eccentric amount Mxz is smaller, the central control unit 31 shifts to step SP35. If the value of the eccentric amount Mxz is larger, the central control unit 31 shifts to step SP36.

<Step SP35>

In step SP35, the central control unit 31 reads and applies the threshold values M_xz3 and the threshold value M_y3 from the memory 32 as the first eccentric amount threshold value (ma) used in the subsequent steps SP32 and SP33. That is, in the present embodiment, when it is determined that the drum 2 is in the opposite load state, the central control unit 31 has a first eccentricity threshold value (when it is set when the drum 2 is not in the opposite load state. Set ma) to a lower value. As a result, when the drum 2 is in a state of facing load, the transition to the eccentric position adjustment process, which is also called tumbling, is most easily performed.

<Step SP36>

In step SP36, the central control unit 31 reads out which area Y of the areas Y shown in the parameter table of FIG. 5 is the temporary eccentric position θ1 stored in the memory 32. When the central control unit 31 determines that the temporary eccentric position θ1 is the region Y in which the water supply valve Z is not set, that is, the region (P (A)), (P (B)) or (P (C)). , Step SP38. When the central control unit 31 determines that the temporary eccentric position θ1 is the region Y in which the water supply valve Z is set, that is, the region (P (AB)), (P (BC)) or (P (CA)). , Step SP37.

<Step SP37>

In step SP37, the central control unit 31 reads and applies the threshold value M_xz2 and the threshold value M_y2 from the memory 32 as the first eccentricity threshold value (ma) used in the subsequent steps SP32 and SP33.

<Step SP38>

In step SP37, the central control unit 31 reads and applies the threshold values M_xz1 and the threshold value M_y1 from the memory 32 as the first eccentricity threshold value (ma) used in the subsequent steps SP32 and SP33. In the present embodiment, the first eccentricity threshold value (ma) is set differently according to the temporary eccentricity position θ1 in step SP3, which is the first eccentricity detection step. Specifically, when the temporary eccentric position θ1 is in the region (P (A)), (P (B)) or (P (C)), the eccentricity threshold (ma) is set small and the temporary eccentricity is set. When the core position θ1 is in the region (P (AB)), (P (BC)) or (P (CA)), the eccentricity threshold (ma) is set large.

After that, the central control unit 31 performs step ST32 and step ST33 in the same manner as in FIG. 15 using the threshold values applied in step SP35, step SP37, and step SP38.

This completes the description of the process related to the pre-dehydration step among the dehydration steps. Hereinafter, the process related to this dehydration step after step SP6 will be described. Since the processes related to step SP7 and step SP8 have already been described above, the specific processes related to step SP6, that is, the water injection step will be mainly described.

FIG. 17 is a flowchart showing an outline of the water injection process. As described above, in the water injection step of the present embodiment, as described above, the process of measuring the eccentricity amount / temporary eccentricity position, which is the step SP2 that has been continuously performed since the rotation speed of the drum 2 reaches 180 rpm, is performed. Originally, the process of determining the eccentric position in step ST61 and the process of performing water injection in step 62 are mainly performed.

<Step SP61>

In step SP61, the central control unit 31 determines the formal eccentric position θ2 from the temporary eccentric position θ1. The process of determining the core position will be described later.

<Step SP62>

In step SP62, the central control unit 31 injects water into the baffle 7 according to the eccentric amount (M) and the formal eccentric position θ2 obtained in step SP61. The treatment of water injection will be described later.

FIG. 18 is a flowchart showing a specific treatment procedure of the water injection process according to the present embodiment. An example of the procedure from the process of measuring the eccentricity amount / temporary eccentricity position as step SP2, which has been continuously performed since the rotation speed of the drum 2 reaches 180 rpm, to the step 61 is described. ..

In step 63, the central control unit 31 selects the larger value of the horizontal eccentric amount Mx and the vertical eccentric amount Mz determined in step SP2 as the eccentric amount (M). In the present embodiment, for convenience of explanation, the selected eccentric amount (M) is referred to as eccentric amount Mxz.

<Step SP64>

In step SP64, the central control unit 31 determines whether or not the eccentric amount Mxz exceeds the threshold value M_xz4 which is the eccentric amount threshold value (mb) for water injection. If the eccentric amount Mxz is less than the threshold value M_xz4, the process proceeds to step SP65. If the selected eccentric amount Mxz exceeds the threshold value M_xz4, the process proceeds to step SP66.

<Step SP65>

In step SP65, the central control unit 31 determines whether or not the eccentricity amount My in the front-rear direction exceeds the threshold value M_y4 which is the eccentricity amount threshold value (mb) for water injection. The central control unit 31 does not calculate the eccentric amount (M) if the eccentric amount My is less than the threshold value M_y4. In other words, the central control unit 31 determines that the eccentricity (M) in this case is such that water injection into the baffle 7 is not required. In this case, the central control unit 31 increases the rotation speed of the drum 2. If the eccentricity amount My exceeds the threshold value M_y, the central control unit 31 shifts to step SP66.

<Step SP66>

In step SP66, the central control unit 31 maintains the rotation speed of the drum 2 without increasing it. After that, the central control unit 31 performs the process of determining the eccentric position in step SP61 and the process of performing water injection in step SP62.

<Step SP67>

In step SP67, the central control unit 31 maintains the rotation speed of the drum 2 without increasing it. After that, the central control unit 31 performs a process of determining the eccentric position in step SP61 and a process of performing water injection in step SP62.

As shown in FIGS. 17 and 18, in the control method according to the present embodiment, the eccentricity amount (M) is calculated and calculated based on the signals from the acceleration sensor 12 in a plurality of directions including the front-rear direction. Water injection is performed based on the formal eccentric position θ2, which is the eccentric position (N) determined based on the signal at which the eccentric amount (M) is equal to or greater than the eccentric amount threshold (mb) for water injection. It is characterized by.

The process of formalizing the eccentric position will be described with reference to FIGS. 19 and 20. FIG. 19 is a flowchart showing a processing procedure for formal determination of the eccentric position. FIG. 20 is a diagram showing the relationship between the eccentricity amount (M) shown in FIG. 19 and the first threshold value and the second threshold value. The data according to FIG. 20 is stored in the memory 32, and the required data is appropriately read out depending on the situation. The unit of the numbers in the eccentric amount Mx, My, and Mz, which is the eccentric load amount in FIG. 20, is gram (g). Further, the unit of the numbers in the first threshold value a1, b1, c1 and the second threshold value a2, b2, c2 in the figure is rpm.

As shown in FIG. 20, although the temporary eccentric position θ1 corresponds to the formal eccentric position θ2, the relationship between the temporary eccentric position θ1 and the formal eccentric position θ2 differs depending on the rotation speed of the drum 2. In the present embodiment, the procedure for calculating the formal eccentric position θ2 is different depending on the eccentricity amount (M) and the rotation speed of the drum 2. Specifically, when the rotation speed of the drum 2 is lower than the first threshold a1, b1, c1, the rotation speed of the drum 2 is equal to or higher than the first threshold a1, b1, c1 and the second thresholds a2, b2. , The formula for calculating the formal eccentric position θ2 is different when the rotation speed is lower than c2 and when the rotation speed of the drum 2 is at the second threshold a2, b2, c2 or more. ..

<Step SP611>

In step SP611, the central control unit 31 determines the first threshold values a1, b1, c1 and the second threshold values a2, b2, c2 for the eccentric quantities Mx, My, and Mz, respectively, according to the representations shown in FIG. In other words, the central control unit 31 reads out the first threshold values a1, b1, c1 and the second threshold values a2, b2, c2 corresponding to the eccentric amounts Mx, My, and Mz from the memory 32.

<Step SP612>

In step SP612, the central control unit 31 determines whether or not the rotation speed of the drum 2 is lower than the first threshold values a1, b1, and c1. If the rotation speed of the drum 2 is lower than the first threshold values a1, b1 and c1, the process proceeds to step 613. When the rotation speed of the drum 2 is equal to or higher than the first threshold values a1, b1, c1, the process proceeds to step 614.

<Step SP613>

In step SP613, the central control unit 31 determines the value of the temporary eccentric position θ1 as it is as the value of the formal eccentric position θ2.

<Step SP614>

In step SP614, the central control unit 31 determines whether or not the rotation speed of the drum 2 is lower than the second threshold values a2, b2, and c2. When the rotation speed of the drum 2 is lower than the first threshold values a2, b2, and c2, the central control unit 31 shifts to step 615. The central control unit 31 shifts to step 616 when the rotation speed of the drum 2 is equal to or higher than the first threshold values a2, b2, and c2.

<Step SP615>

In step SP615, the central control unit 31 determines the value obtained by subtracting 90 ° from the temporary eccentric position θ1 as the value of the formal eccentric position θ2. In this case, when the value of the formal eccentric position θ2 is lower than 0, the central control unit 31 sets the value obtained by further adding 360 ° as the formal eccentric position θ2.

<Step SP616>

In step SP616, the central control unit 31 determines the value obtained by subtracting 180 ° from the temporary eccentric position θ1 as the value of the formal eccentric position θ2. In this case, when the value of the formal eccentric position θ2 is lower than 0, the central control unit 31 sets the value obtained by further adding 360 ° as the formal eccentric position θ2.

The process of performing water injection shown in step SP62 will be described. FIG. 21 is a flowchart showing a processing procedure for water injection.

<Step SP621>

In step SP621, as in step SP31, the central control unit 31 sets the larger value of the eccentric amount Mx in the left-right direction and the eccentric amount Mz in the vertical direction determined by step SP25 as the eccentric amount Mxz. And. In addition, the central control unit 31 determines whether or not the value of the eccentric amount Mxz is larger than the eccentric amount My. If the eccentricity Mxz is larger, the central control unit 31 shifts to step SP622. If the eccentricity Mxz is smaller, the central control unit 31 proceeds to step SP623.

<Step SP622>

In step SP622, the central control unit 31 determines that the determined eccentric position θ2 based on the eccentric amount (M) indicating the larger value of the eccentric amount Mx and the eccentric amount Mz is applied to the water injection. ..

<Step SP623>

In step SP623, the central control unit 31 determines that the determined eccentric position θ2 based on the eccentric amount My is applied to water injection.

<Step SP624>

In step SP624, the central control unit 31 executes the process of driving the water supply valve. The specific procedure of the water supply valve drive process will be described later.

<Step SP625>

In step SP625, the central control unit 31 executes a process of determining the amount of water supplied to determine whether or not the amount of water supplied to the baffle 7 is appropriate. The specific procedure of the process will be described later.

<Step SP626>

In step SP626, the central control unit 31 shifts to step SP627 when it is determined that any of the baffles 7 is not full in the water supply amount determination process according to step SP625. Further, the central control unit 31 shifts to SP632 when it is determined that any of the baffles 7 is full in the water supply amount determination process according to step SP625.

<Step SP627>

In step SP627, the central control unit 31 normally injects water to reduce the eccentricity (M), but conversely, it determines whether or not the eccentricity (M) has increased. Execute the amount increase judgment. The specific procedure for determining the increase in eccentricity will be described later.

<Step SP628>

In step SP628, the central control unit 31 determines whether or not there is M increase information (NG), which is eccentric amount increase information, in the eccentric amount increase determination according to step SP627. If there is no M increase information (NG), the central control unit 31 proceeds to step SP631. When there is M increase information (NG), the central control unit 31 proceeds to step SP629.

<Step SP629>

In step SP629, the central control unit 31 determines whether or not the M increase information (NG) is 3 times or less in step SP628. If the M increase information (NG) is 3 times or less, the central control unit 31 proceeds to step SP631. If the M increase information (NG) is not 3 times or less, the central control unit 31 shifts to step SP632.

<Step SP630>

In step SP630, the central control unit 31 transfers the data of the determined eccentric position θ2 calculated based on any one of the eccentric amounts Mx, My, and Mz applied in steps SP622 and SP623 to other data. change.

<Step SP631>

In step SP631, the central control unit 31 executes an acceleration availability determination as to whether or not to accelerate the rotation speed of the drum 2. The specific procedure for determining whether or not acceleration is possible will be described later.

<Step SP632>

In step SP632, the central control unit 31 executes an acceleration determination change process for changing the determination criterion of whether or not to accelerate the drum 2. The specific procedure of the process will be described later.

In the present embodiment, as described above, the data of the determined eccentric position θ2 is changed to other data in step SP630, but even if water is injected into the baffle 7 based on the changed data of the determined eccentric position θ2, the data is biased. If the core amount (M) is not reduced, the arrangement of the laundry in the drum 2 is changed and dehydration is performed again by performing the control related to the eccentric position adjustment process in step SP5 described above, although not shown. I try to start the process.

Subsequently, a specific procedure of the process of driving the water supply valve according to the above-mentioned step SP624 will be described with reference to FIG.

<Step SP633>

In step SP633, the central control unit 31 acquires the formal eccentric position θ_fix applied to drive the water supply valves 62a, 62b, 62c. The formal eccentric position θ_fix is any value of the formal eccentric position θ2 obtained from the eccentric quantities Mx, My, and Mz. Further, in the present embodiment, as shown in FIG. 5, the formal eccentric position θ_fix is indicated by a relative angle from an arbitrary virtual line extending in the circumferential direction of the axis S1, and is 0 to 359 meaning 0 ° to 359 °. It is shown in FIG. 22 as any of the numerical values.

<Step SP634>

In step SP634, the central control unit 31 determines whether or not the condition that the formal eccentric position θ_fix is smaller than 10 or larger than 350 is satisfied. When the above conditions are met, the central control unit 31 proceeds to step SP635. If the above conditions are not met, the central control unit 31 proceeds to step SP636.

<Step SP635>

In step SP635, the central control unit 31 determines that the formal eccentric position θ_fix is in the region P (A) shown in FIG. 5, and drives the water supply valve 62a to supply water to the baffle 7 (A).

<Step SP636>

In step SP636, the central control unit 31 determines whether or not the condition that the formal eccentric position θ_fix is 10 or more and 110 or less is satisfied. When the above conditions are met, the central control unit 31 proceeds to step SP637. If the above conditions are not met, the central control unit 31 proceeds to step SP638.

<Step SP637>

In step SP636, the central control unit 31 determines that the formal eccentric position θ_fix is in the region P (AB) shown in FIG. 5, drives the water supply valves 62a and 62b, and drives the baffles 7 (A) and 7 Water is supplied to (B).

<Step SP638>

In step SP638, the central control unit 31 determines whether or not the condition that the formal eccentric position θ_fix is 110 or more and 130 or less is satisfied. When the above conditions are met, the central control unit 31 proceeds to step SP639. If the above conditions are not met, the central control unit 31 proceeds to step SP640.

<Step SP639>

In step SP639, the central control unit 31 determines that the formal eccentric position θ_fix is in the region P (B) shown in FIG. 5, drives the water supply valve 62b, and supplies water to the baffle 7 (B).

<Step SP640>

In step SP640, the central control unit 31 determines whether or not the condition that the formal eccentric position θ_fix is 130 or more and 230 or less is satisfied. If the above conditions are met, the central control unit 31 proceeds to step SP641. If the above conditions are not met, the central control unit 31 proceeds to step SP642.

<Step SP641>

In step SP641, the central control unit 31 determines that the formal eccentric position θ_fix is in the region P (BC) shown in FIG. 5, drives the water supply valves 62b, 62c, and baffles 7 (B), 7 Water is supplied to (C).

<Step SP642>

In step SP642, the central control unit 31 determines whether or not the condition that the formal eccentric position θ_fix is 230 or more and 250 or less is satisfied. When the above conditions are met, the central control unit 31 proceeds to step SP643. If the above conditions are not met, the central control unit 31 proceeds to step SP644.

<Step SP643>

In step SP643, the central control unit 31 determines that the formal eccentric position θ_fix is in the region P (C) shown in FIG. 5, drives the water supply valve 62c, and supplies water to the baffle 7 (C).

<Step SP644>

In step SP644, the central control unit 31 determines that the condition that the formal eccentric position θ_fix is 250 or more and 350 or less is satisfied, and proceeds to step SP645.

<Step SP645>

In step SP645, the central control unit 31 determines that the formal eccentric position θ_fix is in the region P (CA) shown in FIG. 5, drives the water supply valves 62c, 62a, and drives the baffles 7 (C), 7 Water is supplied to (A).

In the present embodiment, the temporary eccentric position θ1 and the formal eccentric position θ2 are always calculated and determined while the water supply valve driving process shown in FIG. 22 is being performed. Therefore, the water injection according to the present invention switches the baffle 7 for injecting water from the steps SP637, SP641, SP645 corresponding to the simultaneous water injection step according to the present invention to a single baffle 7 (A), (B) or (C). It goes without saying that the process proceeds to steps SP635, SP639 or SP643 corresponding to the switching step.

Subsequently, a specific procedure of the water supply amount determination process according to the above-mentioned step SP625 will be described with reference to FIG. 23.

<Step SP646>

In step SP646, the central control unit 31 integrates the drive times of the water supply valves 62a, 62b, and 62c, respectively.

<Step SP647>

In step SP646, the central control unit 31 converts the integrated drive time into the amount of water supplied to each of the water supply valves 62a, 62b, and 62c.

<Step SP648>

In step SP648, the central control unit 31 determines whether or not the cumulative water supply amount of the water supply valve 62a has reached 1000 g. When the central control unit 31 determines that the accumulated water supply amount has reached 1000 g, the central control unit 31 proceeds to step SP649. When the central control unit 31 determines that the integrated water supply amount has not reached 1000 g, the process proceeds to step SP650.

<Step SP649>

In step SP649, the central control unit 31 determines that the baffle 7 (A) supplied by the water supply valve 62a is full, and transmits information indicating YES in the process of step SP626 shown in FIG.

<Step SP650>

In step SP650, the central control unit 31 determines whether or not the cumulative water supply amount of the water supply valve 62b has reached 1000 g. When the central control unit 31 determines that the accumulated water supply amount has reached 1000 g, the central control unit 31 proceeds to step SP651. When the central control unit 31 determines that the integrated water supply amount has not reached 1000 g, the process proceeds to step SP652.

<Step SP651>

In step SP651, the central control unit 31 determines that the baffle 7 (B) supplied by the water supply valve 62b is full, and transmits information indicating YES in the process of step SP626 shown in FIG.

<Step SP652>

In step SP652, the central control unit 31 determines whether or not the cumulative water supply amount of the water supply valve 62c has reached 1000 g. When the central control unit 31 determines that the accumulated water supply amount has reached 1000 g, the central control unit 31 proceeds to step SP653. When the central control unit 31 determines that the accumulated water supply amount has not reached 1000 g, the central control unit 31 proceeds to step SP654.

<Step SP653>

In step SP653, the central control unit 31 determines that the baffle 7 (C) supplied by the water supply valve 62c is full, and transmits information indicating YES in the process of step SP626 shown in FIG.

<Step SP654>

In step SP654, the central control unit 31 determines that none of the baffles 7 (A), 7 (B), 7 (C) supplied by the water supply valves 62a, 62b, 62c is full, and the step shown in FIG. When processing SP626, information indicating NO is transmitted.

Subsequently, the eccentricity increase determination shown in step SP627 will be described. FIG. 24 is a flowchart showing a processing procedure for determining an increase in the amount of eccentricity.

<Step SP655>

In step SP655, the central control unit 31 determines whether or not the eccentricity Mx, My, Mz has been reduced when the time for water supply by the water supply valves 62a, 62b, 62c has elapsed for 5 seconds. When the central control unit 31 determines that the eccentric amounts Mx, My, and Mz have been reduced, the process proceeds to step SP656. When the central control unit 31 determines that the eccentricities Mx, My, and Mz have not been reduced, the process proceeds to step SP657. Here, the criterion for determining whether or not the eccentric amounts Mx, My, and Mz have been reduced is not necessarily limited to the eccentric amount (M) applied when calculating the formal eccentric position θ_fix. For example, the determination may be based on the sum (subtraction) of the eccentricity Mx and the eccentricity My, or the determination based on the sum (subtraction) of the eccentricity Mz and the eccentricity My. There may be.

<Step SP656>

In step SP656, the central control unit 31 determines that the eccentric amount (M) does not increase. The central control unit 31 transmits a signal indicating NO in step SP629 in FIG. 21, or does not transmit any signal.

<Step SP657>

In step SP657, the central control unit 31 determines that there is an increase in the eccentricity (M), and proceeds to step SP658.

<Step SP658>

In step SP658, the central control unit 31 sends M increase information (NG), which is a predetermined signal, eccentric amount increase information, in order to make a YES determination in step SP628 in FIG.

Subsequently, the acceleration possibility determination shown in step SP631 will be described. FIG. 25 is a flowchart showing a processing procedure for determining whether or not acceleration is possible.

<Step SP659>

In step SP659, the central control unit 31 determines whether or not the eccentric amount Mxz is smaller than the threshold value m_xz5 which is the rotation speed increase threshold value (mc). When the central control unit 31 determines that the eccentric amount Mxz is smaller than the threshold value m_xz 5, the process proceeds to step 660. When the central control unit 31 determines that the eccentric amount Mxz is not smaller than the threshold value m_xz5, it determines that the acceleration cannot be achieved yet, and proceeds to step SP625 to continue the water supply to the baffle 7.

<Step SP660>

In step SP660, the central control unit 31 determines whether or not the eccentricity amount My is smaller than the threshold value my_y5, which is the rotation speed increase threshold value (mc). When the central control unit 31 determines that the eccentricity amount My is smaller than the threshold value my_y5, it determines that acceleration is possible and restarts the acceleration of the drum 2. When the central control unit 31 determines that the eccentricity amount My is not smaller than the threshold value m_y5, it determines that acceleration cannot be performed yet, and proceeds to step SP625 in order to continue water supply to the baffle 7.

Here, the relationship between the water injection eccentricity threshold value (mb) shown in FIG. 18 and the rotation speed increase threshold value (mc) shown in FIG. 25 will be described. In the present embodiment, as described above, as the acceleration sensor 12, a three-axis acceleration sensor 12 capable of detecting acceleration in the left-right direction, the up-down direction, and the front-back direction is applied. In the present embodiment, different water injection eccentricity threshold values (mb) and rotation speed increase threshold values (mc) are set for each of these three acceleration directions. Further, in the present embodiment, the difference between the water injection eccentricity threshold value (mb) and the rotation speed increase threshold value (mc) is set so as to gradually or gradually decrease as the rotation speed increases. In addition, in the present embodiment, as the eccentricity amount (M) of the drum 2 increases, the difference between the eccentricity amount threshold value (mb) for water injection and the rotation speed increase threshold value (mc) gradually increases or gradually increases. It is set to be.

Subsequently, the process of changing the acceleration determination shown in step SP632 will be described. FIG. 26 is a flowchart showing a processing procedure for changing the acceleration determination.

<Step SP661>

In step SP661, the central control unit 31 sets the threshold value m_xz5 and the threshold value m_y5, which are the rotation speed increase threshold values (mc) used for the acceleration possibility determination according to the step SP631 described above, to a larger value than the eccentricity allowable threshold value ( The threshold value m_xz6 and the threshold value m_y6, which are md), are changed, and the process proceeds to step SP631. The central control unit 31 uses the threshold value m_xz6 and the threshold value m_y6 to determine whether or not acceleration is possible in step SP631.

<Step SP662>

In step SP662, the central control unit 31 determines whether or not acceleration is possible by determining whether or not acceleration is possible in step SP631 performed using the threshold value m_xz6 and the threshold value m_y6, which are the eccentric amount allowable threshold values (md) changed by step SP661. Make a judgment. The central control unit 31 accelerates the drum 2 when the result of the acceleration availability determination is accelerating. When the result of the acceleration availability determination is that acceleration is not possible, the central control unit 31 determines that it is difficult to continue the dehydration step, and performs the eccentric position adjustment process in step SP5.

As described above, in step SP5, the central control unit 31 stops the rotation of the drum 2 or lowers the rotation speed of the drum 2 to a rotation speed in which gravity is superior to the centrifugal force to reduce the laundry in the drum 2. Stir in the vertical direction. After that, the dehydration step will be started again from step SP1.

As described above, the control method of the drum type washing machine 1 of the present embodiment is when the rotation speed of the drum 2 reaches the first rotation speed (N1) lower than the resonance point CP of the drum 2 in the dehydration step. The first eccentricity detection step for detecting the eccentricity amount (M) and the temporary eccentricity position θ1 which is the eccentricity position (N) and the eccentricity amount (M) detected by the first eccentricity detection step are When it is larger than the first eccentricity threshold (ma) set to a different value depending on the eccentric position (N), the rotation speed of the drum 2 is lowered or the rotation of the drum 2 is stopped to enter the drum 2. The washing machine stirring step in which the washing machine is stirred up and down and then the rotation speed of the drum 2 is increased to the first rotation speed (N1), and the eccentricity amount (M) detected by the first eccentricity detection step If it is equal to or less than the first eccentricity threshold (ma), the rotation speed of the drum 2 is increased beyond the resonance point CP, and at the same time, the eccentricity (M) and the eccentric position (N) are continued. The eccentricity amount (M) detected by the second eccentricity detection step and the second eccentricity detection step is set to different values depending on the rotation speed of the drum 2. When it becomes mb) or more, the water injection step of reducing the eccentricity (M) by injecting water into the baffle 7 while keeping the rotation speed of the drum 2 constant, and the eccentricity (M) reduced by the water injection step are the rotations of the drum 2. If it is equal to or less than the rotation speed increase threshold (mc) set to a value different depending on the number, it has a rotation speed increase step of stopping water injection and increasing the rotation speed of the drum 2, and a second eccentricity detection step. A method for controlling a drum-type washing machine 1, wherein the water injection step and the rotation speed increase step are performed until the rotation speed of the drum 2 reaches a predetermined dehydration steady rotation speed.

According to this embodiment, the amount of eccentricity (M) caused by the bias of the laundry is quickly reduced, so that the normal dehydration process can be stably performed without decelerating or stopping the rotation of the drum 2 in the middle. In addition to continuing, it is possible to shorten the time of the dehydration step by optimizing the timing and water injection time of water injection into the baffle 7.

Further, in the present embodiment, the eccentricity amount (M) can be easily reduced by injecting water into the baffle 7, and when the temporary eccentricity position θ1 is at a position facing the baffle 7, the first eccentricity amount threshold value (ma) is set. By setting a large value, the effect of water injection into the baffle 7 can be further utilized to continue the dehydration operation more stably.

Further, in the present embodiment, when it is determined that the drum 2 is in a state of facing load, the first eccentricity threshold value (ma) is set to a lower value than when it is set when the drum 2 is not in a facing load. Since it is set, it is possible to effectively avoid the problem that the eccentricity amount (M) is not reduced even if water is injected into the baffle 7 for a long time, and the time required for dehydration becomes long.

Further, in the present embodiment, it is assumed that the acceleration sensor 12 can detect accelerations in the left-right direction, up-down direction, and front-back direction, respectively, and a first eccentricity amount threshold different for each of these left-right direction, up-down direction, and front-back direction accelerations. Since (ma) is set, more accurate control based on the eccentricity amount (M) and the temporary eccentric position θ1 is realized.

Further, in the present embodiment, the difference between the water injection eccentricity threshold value (mb) and the rotation speed increase threshold value (mc) is set to gradually or gradually decrease as the rotation speed increases, so that the drum Stable and accurate water injection is realized regardless of the rotation speed of 2.

Further, in the present embodiment, the difference between the water injection eccentric amount threshold value (mb) and the rotation speed increase threshold value (mc) is set to gradually or gradually increase as the eccentricity amount (M) increases. Therefore, stable and accurate water injection is realized regardless of the amount of eccentricity (M).

Although one embodiment of the present invention has been described above, the configuration of the present embodiment is not limited to that described above, and various modifications are possible.

For example, in the above embodiment, an example in which the present invention is applied to a so-called diagonal drum type fully automatic washing machine that can be suitably used for home use as a washing machine is disclosed, but of course, it is widely and preferably applied in a coin laundry store. Even in a horizontal washing machine, the control method according to the present invention can be preferably applied.

Further, for example, in the above embodiment, the embodiment in which three baffles 7 are provided is disclosed, but of course, a configuration in which four or more baffles 7 are provided may be provided. Further, it goes without saying that the baffles 7 do not necessarily have to be arranged at equal angular intervals with respect to the circumferential direction of the drum 2, and they do not necessarily have to have the same shape.

Further, in the above embodiment, the acceleration sensor 12 is arranged with one three-axis acceleration sensor capable of detecting acceleration in the left-right direction, the up-down direction, and the front-back direction, but any one of the up-down direction, the left-right direction, and the front-back direction. The acceleration sensor 12 may be configured by attaching a plurality of acceleration sensors capable of detecting acceleration in only one direction.

Other configurations can be modified in various ways without departing from the spirit of the present invention.

1 ... Washing machine 2 ... Drum 7 ... Baffle CP ... Resonance point N, θ1, θ2 ... Eccentric position N1 ... First rotation speed M ... Eccentric amount ma ... First eccentricity threshold mb ... Water injection eccentricity threshold mc ... Rotation speed increase threshold SP2 ... First eccentricity detection step SP4 ... Second eccentricity detection Step SP6 ... Water injection step SP8 ... Rotation speed increase step

Claims (6)

A bottomed tubular drum configured to be rotatable around an axis extending in the horizontal or inclined direction, and three or more hollow baffles arranged on the inner peripheral surface of the drum along the axial direction of the drum. , A water receiving unit for injecting water into each of the baffles, an acceleration sensor for detecting the vibration of the drum, and an eccentric amount and eccentricity in the drum based on the vibration of the drum detected by the acceleration sensor. A control method for a drum-type washing machine having an eccentricity detecting means for detecting a position.
In the dehydration process
The first eccentricity detection step for detecting the eccentricity amount and the eccentric position when the rotation speed of the drum reaches the first rotation speed lower than the resonance point of the drum,
When the amount of eccentricity detected by the first eccentricity detection step is larger than the first eccentricity amount threshold set to a value different depending on the eccentric position, the rotation speed of the drum is lowered or the number of rotations of the drum is reduced. A laundry stirring step in which the laundry in the drum is stirred up and down in the drum by stopping the rotation, and
If the eccentricity detected by the first eccentricity detection step is equal to or less than the first eccentricity threshold value, the rotation speed of the drum is increased beyond the resonance point, and the eccentricity and the eccentricity are increased. A second eccentricity detection step that continuously detects the eccentric position,
If the eccentricity detected by the second eccentricity detection step is equal to or greater than the eccentricity threshold for water injection set to a value different depending on the rotation speed of the drum, the rotation speed of the drum is set to be substantially constant and the baffle is set. Water injection step and water injection
When the eccentricity amount becomes equal to or less than the rotation speed increase threshold value set to a value different depending on the rotation speed of the drum by the water injection step, there is a rotation speed increase step of stopping the water injection and increasing the rotation speed of the drum. And
A method for controlling a drum-type washing machine, characterized in that the second eccentricity detection step, the water injection step, and the rotation speed increase step are performed until the rotation speed of the drum reaches a predetermined dehydration steady rotation speed. The control method for a drum-type washing machine according to claim 1, wherein the first eccentricity threshold value is set to the maximum when the eccentric position is at a position facing the baffle. The first eccentricity threshold is set to a value lower than the value set when the eccentric position is not in the opposite load state when it is determined that the eccentric position is in the opposite load state. The method for controlling a drum-type washing machine according to claim 1 or 2, wherein the method is characterized by the above. The acceleration sensor can detect acceleration in the left-right direction, up-down direction, and front-back direction, respectively.
The control method for a drum-type washing machine according to claim 1 or 2, wherein the first eccentricity threshold value is set to a different value for each acceleration in the horizontal direction, the vertical direction, and the front-rear direction. The drum according to claim 1 or 2, wherein the difference between the water injection eccentricity threshold value and the rotation speed increase threshold value is set so as to gradually or gradually decrease as the rotation speed increases. How to control the washing machine. Claim 1 or 2 is characterized in that the difference between the water injection eccentricity threshold value and the rotation speed increase threshold value is set so as to gradually or gradually increase as the eccentricity amount increases. The method of controlling a drum-type washing machine described.

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