WO2018028390A1 - Control method for drum washing machine - Google Patents

Abstract

A control method for a drum washing machine (1), which is capable of suppressing vibration and noise caused by eccentricity of a drum (2) and effectively avoiding operation time delay. The control method for the washing machine comprises the following steps: a simultaneous water injection step of simultaneously injecting water into two enhancement ribs (7) except when an eccentric position (N) is located at a position approximately opposite to the enhancement ribs; a water injection switching step of continuously calculating an eccentric amount (M) and the eccentric position in parallel to the simultaneous water injection step, and when the eccentric position changes to a position approximately opposite to any enhancement rib, switching to injecting water into the enhancement rib on an approximately opposite side; and a rotating speed increasing step of stopping the injection of water into the enhancement rib and increasing a rotating speed of a drum when the eccentric amount is changed by means of the water injection switching step to be below a rotating speed increasing threshold (mc) which changes according to the rotating speed of the drum.

Description

Control method of drum washing machine Technical field

The present invention relates to a control method of a washing machine having a dehydrating function.

Background technique

It is installed in a washing machine such as an ordinary household or a self-service laundry room, and some of them have a washing and dehydrating function, a washing and dehydrating drying function.

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

In order to eliminate this bias, the user stops the operation of the washing machine and eliminates the bias of the laundry by manual operation.

In order to eliminate such troublesome work, when it is determined that the deviation of the laundry, that is, the magnitude of the imbalance, is larger than a predetermined value, the drum is decelerated according to the output timing of the position detecting unit to eliminate the offset of the laundry until The number of revolutions in which the centrifugal force is less than the gravity is referred to (see Patent Document 1).

Further, in order to prevent the imbalance of the laundry from deviating toward the front portion of the drum during dehydration, the difference between the detected vibration amounts is calculated by the acceleration sensors disposed at the front and the rear of the drum, and the laundry is deflected toward the front of the drum. Unbalanced state (refer to Patent Document 2).

Further, recently, as described in Patent Document 3, it has been proposed to actively eliminate the unbalanced state of the drum by injecting water to a balancer that is uniformly disposed in the circumferential direction of the drum.

The technique disclosed in the above Patent Document 1 reduces the centrifugal force by decelerating the rotation of the drum, and drops the laundry overlapping each other by gravity. However, in this prior art, the laundry which is entangled into agglomerates directly falls, so that the agglomerates cannot be unwound. When the drum is rotated in such a state, the imbalance is not eliminated, 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 vibration detecting unit at the front and the vibration value detected by the detecting unit at the rear when the drum rotates. Further, when the difference in the vibration value exceeds a predetermined threshold value, the rotation of the drum is decelerated or stopped.

However, even with this prior art, the laundry that is intertwined into agglomerates remains in the unresolved state in the drum, and is not a fundamental solution to eliminate the imbalance.

Therefore, according to the technique described in Patent Document 3, it is expected to solve the problems that cannot be solved in the above two patent documents. Moreover, it is now desired to provide a further specific control step, specific solution for actively solving the above problems.

Prior art literature

Patent literature

Patent Document 1: Japanese Patent Laid-Open No. Hei 9-290089

Patent Document 2: Japanese Laid-Open Patent Publication No. 2009-82558

Patent Document 3: JP-A-2016-197

Summary of the invention

Problems to be solved by the invention

The present invention is an invention for solving such a conventional problem. According to the present invention, it is possible to provide a control method of a drum washing machine which can reliably reduce the imbalance of the washing tub and rapidly dehydrate it during the dehydration process even in the case where the laundry is biased in the washing tub. Process to shorten the washing time.

Solution to solve the problem

The present invention relates to a control method of a drum washing machine, which has a bottomed cylindrical drum that is configured to be rotatable about an axis extending in a horizontal direction or an oblique direction, and a hollow lifting rib that is along an axis of the drum. The inner circumferential surface of the drum is provided with three or more; a water receiving unit for injecting water into each of the lifting ribs; an acceleration sensor for detecting vibration of the drum; and an eccentricity detecting portion, which is detected by the acceleration sensor The vibration of the drum detects the amount of eccentricity and the position of the eccentricity in the drum. When the eccentric amount reaches a predetermined threshold value for the eccentricity of water injection during the dehydration process, the water is injected into the lifting rib corresponding to the eccentric position. Decreasing the amount of eccentricity, and then causing the rotational speed of the drum to reach a predetermined dehydration stable rotational speed, the control method of the drum washing machine is characterized by: a simultaneous water injection step, except when the eccentric position is located at the lift rib relative to the axis In addition to the opposite position, simultaneously inject water into more than two lifting ribs; the water injection switching step, and the simultaneous injection The step continuously calculates the eccentric amount and the eccentric position in parallel, and switches to a watering of a lifting rib on the substantially opposite side when the eccentric position changes to a substantially opposite position of any of the lifting ribs; and the step of increasing the speed, the eccentric amount becomes When the rotation rise threshold value of the change in the number of rotations of the drum is equal to or lower than the threshold value, the water is stopped from being injected into the lift rib, and the number of revolutions of the drum is increased.

Further, the present invention is characterized in that each of the lifting ribs stores the amount of water injected into the lifting ribs. For metering, no water injection is required for each lifting rib beyond its content.

Further, the present invention is characterized in that the dehydration rotation speed is made when the eccentric amount when the water injection amount of the lifting rib reaches the content amount of the lifting rib is smaller than the eccentricity allowable threshold value set to be larger than the value of the rotation rising threshold value rise,

When the eccentric amount when the water injection amount of the lifting rib reaches the content amount of the lifting rib is equal to or higher than the eccentric amount allowable threshold, the dehydration process is stopped.

Further, the present invention is characterized in that the acceleration sensor is a sensor capable of detecting accelerations in the left-right direction, the up-and-down direction, and the front-rear direction, and calculates an eccentric amount and an eccentric position based on a signal of acceleration in any one direction, and corresponds to the eccentricity from the direction of the eccentricity. When the eccentricity is increased after the water injection of the lifting rib of the position starts for a certain period of time, the eccentric position calculated based on the signal of the acceleration in the direction different from the one direction is used to perform water injection into the lifting rib.

Further, the present invention is characterized in that when the eccentric amount is not lowered even after the change of the signal for calculating the acceleration of the eccentric position a plurality of times, the water is injected into the lifting rib and the rotation speed of the drum is stopped or the rotation of the drum is stopped. The laundry in the drum is stirred up and down in the drum.

Effect of the invention

According to the present invention, by introducing the simultaneous water injection step and the water injection switching step, the amount of eccentricity can be accurately reduced in a short time. As a result, the time of the dehydration process can be made shorter.

The control method of the washing machine of the present invention can further shorten the time of the dehydration process by preventing the water injection in vain.

The control method of the washing machine of the present invention can effectively avoid the delay of the dehydration time due to the interruption and re-entry of the dehydration process by maintaining the allowable eccentric amount to continue the dehydration process.

The control method of the washing machine of the present invention can effectively avoid the delay by quickly avoiding the futile expense of the water injection time based on the erroneous eccentric position.

The control method of the washing machine of the present invention can effectively reduce the delay of the dehydration process by quickly avoiding the futile expense of the water injection time based on the erroneous eccentric position.

DRAWINGS

Fig. 1 is a view schematically showing a cross section of a washing machine 1 according to an embodiment of the present invention.

2 is a block diagram of an electrical system of the same washing machine 1.

FIG. 3 is a view for explaining a control flow in the dehydration process of the same washing machine 1.

4 is a parameter table showing the water supply valve 62 that is open.

FIG. 5 is a schematic view showing an eccentric position in the drum 2.

Fig. 6 is a schematic view showing a state in which the inside of the drum 2 is in a facing load.

FIG. 7 is a graph showing an outline of a dehydration process of the washing machine 1 of the present embodiment.

Fig. 8 is a flow chart showing a control flow in the dehydration process of the same washing machine 1.

Fig. 9 is a flowchart showing an eccentric position adjustment process.

Fig. 10 is a schematic flow chart showing the main process of dehydration.

Figure 11 is a flow chart showing the main process of dehydration.

FIG. 12 is a graph showing the relationship between the acceleration obtained by the acceleration sensor 12 and the pulse signal ps obtained by the proximity switch 14.

Fig. 13 is a flowchart showing a process of measuring an eccentric amount/assumed eccentric position.

Fig. 14 is a flowchart showing the process of determining the maximum value/minimum value.

Fig. 15 is a schematic flow chart showing a process of starting determination.

Fig. 16 is a specific flowchart showing a process of starting determination.

Fig. 17 is a schematic flow chart showing the processing of the water injection process.

Fig. 18 is a specific flow chart showing the processing of the water injection process.

Fig. 19 is a flowchart showing a process of officially determining an eccentric position.

Fig. 20 is a view for explaining a control flow in the dehydration process of the same washing machine 1.

FIG. 21 is a flowchart showing a process of water injection implementation of the same washing machine 1.

Fig. 22 is a flow chart showing a specific process of the water supply valve drive.

Fig. 23 is a flow chart showing a specific process of determining the amount of water supply.

FIG. 24 is a flowchart showing a process of determining an eccentric amount increase.

FIG. 25 is a flowchart showing a process of determining the acceleration availability.

FIG. 26 is a flowchart showing a process of the acceleration determination change.

Description of the reference numerals

1: washing machine; 2: drum; 7: lifting rib; N: eccentric position; M: eccentricity; mb: eccentricity threshold for water injection; mc: threshold for speed increase; md: allowable eccentricity threshold.

detailed description

Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic cross-sectional view showing a configuration of a 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 is a washing machine that can be applied to, for example, a laundromat or a household, and includes a washing machine main body 1a, and a washing tub 1b including an outer cylinder 3 and a drum 2 having an axis S1 extending substantially horizontally; The device 1c has a water receiving unit 5 and a nozzle unit 6; a driving device 40; and a control portion 30 only shown in Fig. 2.

The washing machine body 1a shown in Fig. 1 has a substantially rectangular parallelepiped shape. An opening 11 for taking in and taking out the laundry to the drum 2 is formed on the front surface 10a of the washing machine main body 1a, and an opening and closing cover 11a capable of opening and closing the opening 11 is attached. As shown in the same figure, the front surface 10a of the main body 1a of the washing machine is slightly faced upward, whereby the opening 11 for taking the laundry into and out of the drum 2 is formed obliquely upward, and the user can open and close the opening 11 from obliquely upward. The closing cover 11a is opened and closed. That is, the washing machine 1 of the present embodiment is a washing machine called a so-called inclined drum automatic washing machine in which the washing tub 1b is attached to the oblique direction.

The outer cylinder 3 is a bottomed cylindrical member disposed inside the washing machine body 1a, and can store washing water therein. As shown in FIG. 1, an acceleration sensor 12 capable of detecting accelerations in three directions of the left-right direction, the vertical direction, and the front-rear direction is attached to the outer peripheral surface 3a of the outer cylinder 3.

The drum 2 is a bottomed cylindrical member that is disposed coaxially with the outer cylinder 3 and that is rotatably supported in the outer cylinder 3 in the outer cylinder 3 . The drum 2 can accommodate laundry therein, and its wall surface 2a has a plurality of water-passing holes 2b (refer to Fig. 1).

As shown in FIG. 1, the driving device 40 rotates the pulleys 15, 15 and the belt 15b by the motor 10, and rotates the drive shaft 17 that protrudes toward the bottom portion 2c of the drum 2, and applies a driving force to the drum 2 to rotate the drum 2. Further, a proximity switch 14 is provided in the vicinity of one of the pulleys 15, and the proximity switch 14 can detect the passage of the mark 15a formed on the pulley 15. Further, in the present embodiment, the proximity switch 14 corresponds to a drum position detecting device.

As shown in Fig. 1, on the inner peripheral surface 2a1 of the drum 2, three lifting ribs 7 as hollow balancers are provided at equal intervals (equal angles) in the circumferential direction. Each of the lifting ribs 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 to protrude from the inner peripheral surface 2a1 of the drum 2 toward the axis S1. Further, each of the lifting ribs 7 is hollow.

The water receiving unit 5 is a member in which the water guiding groove 5a is formed by superposing three layers in the radial direction along the axis S1 of the drum 2, for example, and is fixed to the inner circumferential surface 2a1 of the drum 2 as shown in FIG. The water guide 5a is set to The number of the ribs 7 is the same, and a water passage path through which the adjustment water W flows to any of the hoisting ribs 7 is formed inside. Further, as shown in FIG. 1, the communication member 5a1 is connected to the inside of the lifting rib 7, and the adjustment water W is supplied from the water receiving unit 5.

Such a water receiving unit 5 and the lifting ribs 7 are respectively connected by the communicating member 5a1.

The nozzle unit 6 is a member that injects the adjustment water W into such a water guide 5a alone. The nozzle unit 6 has three water injection nozzles 6a and water supply valves 62a, 62b, 62c respectively connected to the water injection nozzles 6a. The water injection nozzles 6a are provided in the same number as the water guide tanks 5a, and are disposed at positions where water can be injected into the respective water guides 5a. In addition, in this embodiment, tap water is used as the adjustment water W. Further, as the water supply valves 62a, 62b, 62c, a reversing water supply valve may be employed.

When such a configuration is employed, the water guiding nozzle of the water receiving unit 5 is injected from any of the water injection nozzles 6a of the nozzle unit 6 in the dehydrating process in which the drain valve 50a is opened and the washing water in the outer cylinder 3 is discharged from the drain port 50. The adjustment water W in the 5a flows into the lifting rib 7 via the communication member 5a1. For example, when the adjustment water W is injected from any of the water injection nozzles 6a, the adjustment water W flows into the lifting ribs 7 from the water guide 5a via the communication member 5a1 as indicated by an arrow in FIG.

The lifting rib 7 has a stagnation portion 71 for retaining the conditioned water W injected from the tip end 1d side of the washing tub 1b by the centrifugal force of the dehydrating process by the water injection device 1c, and the outlet portion 72 for allowing the injected conditioned water W to be injected The base end 1e side of the washing tub 1b is discharged. When the drum 2 is in the high-speed rotation state, the adjustment water W that has flowed into the lifting rib 7 is retained by the centrifugal force against the inner circumferential surface 2a1 of the drum 2. Thereby, the weight of the lifting rib 7 increases, and the eccentric amount (M) of the drum 2 changes. In this way, the lifting rib 7 is a truss type lifting rib structure capable of retaining the adjusting water W by centrifugal force. Further, when the dehydration process is nearing completion and the rotation speed of the drum 2 is lowered, the centrifugal force in the lifting rib 7 is gradually attenuated, and the adjustment water W flows out from the outlet portion 72 by gravity, and is discharged to the outside of the outer cylinder 3. At this time, the adjustment water W flows into the lower outer side of the drum 2 via the outlet portion 72. Therefore, the adjustment water W is discharged so as not to wet the laundry 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 unit 30 including a microcomputer. The control unit 30 includes a central control unit (CPU) 31 that controls the entire system, and the control unit 30 is connected to a memory 32 that stores therein a value that is lower than the resonance point CP of the drum 2, respectively. The number of revolutions is the first number of revolutions (N1), the first eccentric amount threshold (ma), the water eccentricity threshold (mb), the speed increase threshold (mc), the eccentricity allowable threshold (md), and the dehydration stable speed. Further, by the control unit 30, by executing the program stored in the memory 32 by the microcomputer, a predetermined operation operation can be performed, and the memory 32 is The data and the like used when executing the above program are stored.

The central control unit 31 outputs a control signal to the rotational speed control unit 33, and further outputs the control signal to the motor control unit (motor control circuit) 34 to perform rotation control of the motor 10. In addition, the rotation speed control unit 33 inputs a signal indicating the number of revolutions of the motor 10 from the motor control unit 34 in real time to constitute a control element.

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

Thus, when the proximity switch 14 detects the mark 15a (refer to FIG. 1), the eccentricity of the drum 2 is calculated in the unbalance amount detecting portion 35 based on the magnitudes of the accelerations in the left-right direction, the up-and-down direction, and the front-rear direction obtained by the acceleration sensor 12. The amount (M) is output to the unbalance amount determining unit 37.

The unbalanced position detecting unit 36 calculates an angle of the unbalanced direction based on the signal indicating the position of the mark 15a input from the proximity switch 14, and outputs an unbalanced position signal as the eccentric position (N) to the water injection control unit 38. Here, the angle of the unbalanced direction refers to the relative angle of the axis S1 with respect to the lifting rib 7 in the circumferential direction. In the present embodiment, as shown in FIG. 5, three lifting ribs 7 (A), 7 (B), and 7 (C) which are arranged at equal angular intervals around the axis S1 are used as an example. The intermediate position of the lifting ribs 7 (B) and 7 (C) at a relative angle to the eccentric position is set to 0°.

When the signals indicating the eccentric amount (M) and the eccentric position (N) from the unbalance amount determining unit 37 and the unbalanced position detecting unit 36 are input, the water filling control unit 38 determines that the water supply should be lifted based on the control program stored in advance. The rib 7 and its water supply. Then, the water injection control unit 38 opens the selected water supply valves 62a, 62b, and 62c to start the injection of the adjustment water W. When the eccentric amount (M) of the predetermined reference or more is generated, the water injection control unit 38 starts to inject the adjustment water into the water guiding groove 5a of the water receiving unit 5 from the water injection nozzle 6a selected based on the calculation of the eccentric amount (M). W, and when the eccentric amount (M) is below a predetermined reference, the injection of the adjustment water W is stopped.

In addition, for example, in the case where the agglomerate LD (X) of the laundry which constitutes the cause of eccentricity as shown in FIG. 3 is located between the lifting rib 7 (B) of the drum 2 and the lifting rib 7 (C) The water injection control unit 38 controls the supply of the adjustment water W to the lifting rib 7 (A). Further, when the agglomerate LD (Y) of the laundry is located in the vicinity of the lifting rib 7 (A), the adjustment water W is supplied to both the lifting rib 7 (B) and the lifting rib 7 (C).

In the present embodiment, in the case where the agglomerate LD (Y) of the laundry is located in the vicinity of any of the lifting ribs 7, in order to reduce the amount of eccentricity (M), it is necessary to inject water into the plurality of lifting ribs 7, in this case The specific control is described in detail.

The central control unit 31 opens the water supply valve X and the water supply valve Z in accordance with the description of the parameter table of Fig. 4 . In the present embodiment, as shown in FIG. 5, by dividing the drum 2 into six in the circumferential direction, the determination of the eccentric position (N) is divided into: an eccentric position (N) for determining that a lifting rib 7 should be filled with water. And determine the eccentric position (N) of the water injection of the two lifting ribs 7. Here, the description of the "eccentric position (N)" in the present embodiment is a concept indicating one or both of the assumed assumed eccentric position θ1 and the officially defined official eccentric position θ2. The assumed eccentric position θ1 and the official eccentric position θ2 will be described in detail later.

The area Y which determines the eccentric position (N) at which the lifting rib 7 should be filled refers to the areas P(A), P(B), and P(C). Further, the region Y of the eccentricity position (N) required for eccentric elimination refers to the regions P(AB), P(BC), and P(CA). Further, the angles centered on the axis S1 of the regions P(A), P(B), and P(C) are set to 20°, and the regions P(AB), P(BC), and P(CA) are used. The angle centered on the axis S1 is set to 100°.

In addition to this, the lifting rib 7 corresponding to the character not described in the ABC is the lifting rib 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 accelerations in the left-right direction, the vertical direction, and the front-rear direction. Thereby, even if the laundry is in a state of being opposed to the base end side and the tip end side of the drum 2 as shown in FIG. 6 (the state of the opposing load), the eccentric position (N) and the amount of eccentricity can be accurately detected ( M). The method of detecting the eccentric position (N) and the eccentric amount (M) in the state of the opposing load will be described in detail later.

The control method of the washing machine 1 of the present embodiment has a first eccentricity detecting step of detecting the eccentric amount (M) and the assumed eccentricity at the time when the rotational speed of the drum 2 reaches the first rotational speed (N1) lower than the resonance point CP of the drum 2. a position θ1; and a washing agitating step, when the eccentric amount (M) detected by the first eccentricity detecting step is greater than the first eccentric amount threshold (ma) set to a different value according to the assumed eccentric position θ1, The rotation speed of the drum 2 is lowered or the rotation of the drum 2 is stopped to agitate the laundry in the drum 2 up and down in the drum 2, and then the rotation speed of the drum 2 is raised to the first rotation speed (N1).

FIG. 7 is a graph showing an outline of a dehydration process of the washing machine 1 of the present embodiment. In Fig. 7, the vertical axis represents the rotational speed of the drum 2, and the horizontal axis represents time. 8, 10, and 11 are flowcharts showing the main outline of the dehydration process. Figure 8 shows the pre-dehydration process in the first half of the dehydration process, Figure 10 And Fig. 11 shows the main dehydration process as a process after the pre-dehydration process.

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

(Step SP1)

In step SP1, the central control unit 31 causes the drum 2 to be reversely rotated, and then the rotation of the drum 2 is raised to a lower first speed (N1) 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 the present embodiment, the first number of revolutions (N1) is set to be lower than the resonance point CP of the drum 2, that is, 180 rpm of 300 rpm.

(Step SP2)

In step SP2, the central control unit 31 executes the eccentric amount/presumed eccentric position measurement of the present embodiment in which the eccentricity detecting unit calculates the eccentric amount (M) and the assumed eccentric position θ1 based on the acceleration signal given by the acceleration sensor 12. control. Specifically, the control of step SP2 in FIG. 8 , that is, the eccentric amount/assumed eccentric position measurement is equivalent to the first eccentricity detecting step of the present invention. At this time, the central control unit 31 calculates the eccentric amount (M) for each direction based on the acceleration signals in the horizontal direction, the vertical direction, and the front-rear direction obtained by, for example, the acceleration sensor 12. The value used in the present control is an eccentric amount (M) calculated based on the eccentric amount (M) in the front-rear direction and the acceleration signal in either the up-down direction or the left-right direction among the calculated values in the three directions.

(Step SP3)

The central control unit 31 compares the calculated eccentricity (M) with the first eccentric amount threshold (ma) stored in the memory 32, and performs a determination of whether or not M<ma is established. When the central control unit 31 determines that M<ma is established, the process proceeds to step SP4, and when it is determined that M<ma is not established, the process proceeds to step SP5. Here, the first eccentric amount threshold (ma) is assumed to be such that the deviation of the laundry is so large that it is difficult to reduce the eccentric amount (M) to increase the rotation speed of the drum 2 to the dehydration stable rotation speed even if the adjustment water W is supplied to the lifting rib 7. The threshold of the degree of situation. That is, in the case of proceeding to step SP5, it means that the eccentric amount (M) is so large that it is difficult to complete the dehydration process even if the adjustment water W is supplied to the lifting rib 7.

The first eccentric amount threshold (ma) will be further described. In the present embodiment, the acceleration sensor 12 employs an acceleration sensor that can detect accelerations in the left-right direction, the vertical direction, and the front-rear direction, respectively. Further, different first eccentric amount threshold values (ma_x, ma_z, ma_y) are set for each acceleration signal in the left-right direction, the vertical direction, and the front-rear direction.

(Step SP4)

In step SP4, when the eccentric amount (M) calculated in step SP2 is smaller than the first eccentric amount threshold (ma) set for each eccentric position, the central control unit 31 increases the number of revolutions of the drum 2. Further, the central control unit 31 continues to execute the control of the eccentric amount/assumed eccentric position measurement of the present embodiment while increasing the number of revolutions of the drum 2. Here, "continuation" is not necessarily limited to a scheme that is continuously performed without interruption. Needless to say, when the number of revolutions of the drum 2 rises to an arbitrary number of revolutions at which the dehydration stable rotational speed is reached, a scheme of intermittently performing the control of the eccentric amount/assumed eccentric position measurement of the present embodiment can be employed. This step SP4 corresponds to the second eccentricity detecting step of the present invention.

In step SP5, the central control unit 31 performs the eccentric position adjustment processing of the laundry in the agitating drum 2 in the vertical direction by stopping the rotation of the drum 2 or reducing the number of revolutions of the drum 2 to a rotational speed greater than the centrifugal force. control. Then, it returns to step SP1. Step SP5 corresponds to the washing agitation step of the present invention. In Fig. 7, the evolution of the rotational speed when the rotational speed of the drum 2 reaches the dehydration stable rotational speed so as not to inject water into the lifting rib 7 is shown by a solid line. Further, in Fig. 7, the virtual line on the upper side shows the evolution of the rotational speed when the rotational speed reaches the dehydration stable rotational speed after the water is fed to the lifting rib 7, and the virtual line on the lower side shows the drum 2 in step SP5. The evolution of speed.

The control of the eccentric position adjustment processing will be further described as shown in FIG. First, when it is judged by the above-described step SP3 that the eccentric amount (M) is too large to be lowered, the rotation of the drum 2 is stopped (step SP51). Then, the drum 2 is rotated at a rotation speed lower than the centrifugal force, and the laundry in the drum 2 is stirred to change the eccentric amount (M) (step SP52).

Hereinafter, the control of the main dehydration process after step SP4 will be schematically illustrated by FIG. 10 and specifically shown in FIG.

(Step SP6)

In step SP6, the central control unit 31 determines whether or not the eccentric amount (M) calculated in step SP2 shown in FIG. 8 is larger than the water injection eccentricity threshold value (mb) set in advance for each rotation speed of the drum 2. When the eccentric amount (M) is lower than the eccentric amount threshold (mb) for water injection, the central control unit 31 does not feed the lifting rib 7 to step SP7. When the eccentric amount (M) is larger than the eccentric amount threshold (mb) for water injection, the central control unit 31 injects water into the lifting rib 7 during the water injection, and then moves to SP7.

(Step SP7)

In step SP7, the central control unit 31 increases the number of revolutions of the drum 2 at a predetermined acceleration.

(Step SP8)

In step SP8, when the rotational speed of the drum 2 reaches the dehydration stable rotational speed, the central control portion 31 maintains the rotational speed of the drum 2 unchanged until the dehydration process ends. In the present embodiment, the dehydration stable rotation speed is set to 800 rpm.

Fig. 11 is a flow chart showing a specific process of the main dehydration process of the present embodiment.

(Step SP71)

In step SP71, the central control unit 31 gradually increases the number of revolutions at 20 rpm per second until the number of revolutions 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 rotational speed of the drum 2 has reached 400 rpm. If the number of revolutions does not reach 400 rpm, the central control unit 31 moves to step SP71. When the number of revolutions reaches 400 rpm, the central control unit 31 moves to step SP73.

(Step SP73)

In step SP73, the central control unit 31 gradually increases the number of revolutions at 5 rpm per second until the number of revolutions of the drum 2 reaches 600 rpm. The central control unit 31 executes step SP6 in parallel while performing step SP73.

(Step SP74)

In step SP74, the central control unit 31 determines whether or not the rotational speed of the drum 2 has reached 600 rpm. When the number of revolutions does not reach 600 rpm, the central control unit 31 moves to step SP73. When the rotation speed reaches 600 rpm, the central control unit 31 moves to step SP75. Here, the acceleration when the rotation speed of the drum 2 is raised to 400 to 600 rpm is lower than the other rotation regions in order to make the amount of water dehydrated from the laundry more than the other rotation regions in the rotation region, thereby making it unnecessary for the dehydrated water. The noise is reduced.

(Step SP75)

In step SP75, the central control unit 31 gradually increases the rotational speed at 20 rpm per second until the rotational speed of the drum 2 reaches 800 rpm. The central control unit 31 executes step SP6 in parallel while performing step SP75.

(Step SP76)

In step SP76, the central control unit 31 determines whether or not the rotational speed of the drum 2 has reached 800 rpm. If the number of revolutions does not reach 800 rpm, the central control unit 31 moves to step SP75. When the number of revolutions reaches 800 rpm, the central control unit 31 moves to step SP8.

(Step SP8)

In step SP8, when the rotation speed of the drum 2 reaches the dehydration stable rotation speed, that is, 800 rpm, the central control unit 31 continues the dehydration process while maintaining the rotation speed, and ends the washing after confirming that the predetermined time has elapsed. In other words, the central control unit 31 rotates the drum 2 at a dehydration stable rotation speed for a predetermined time and performs a dehydration process, similarly to the dehydration process in the normal washing. Then, the dehydration process ends. Further, when the dehydration is completed and the drum 2 starts to decelerate and the centrifugal force is lower than the gravitational acceleration, the adjustment water W in the lifting rib 7 flows out and is discharged.

In the control method of the present embodiment, after the second eccentricity detecting step, that is, step SP3, the water filling step, step SP6, and the speed increasing step, step SP7, are repeated until the rotation speed of the drum 2 reaches the dehydration stable rotation speed.

Next, a specific embodiment of the control method of the present embodiment will be further described.

An algorithm for assuming the eccentric position θ1 in the present embodiment will be described. The present embodiment is characterized in that, in the dehydration process, the time difference t1 between any one of the signals indicating the acceleration of at least one period t2 of the drum 2 emitted from the acceleration sensor 12 and the timing of the pulse signal ps from the proximity switch 14 is calculated. And calculating the assumed eccentric position θ1 in the circumferential direction in the drum 2 based on the relationship between the time difference t1 and the rotational speed of the drum 2, performing control for reducing the eccentric amount (M) based on the calculated assumed eccentric position θ1, and from the acceleration sensor 12 Any of the signals including at least a plurality of directions in the front-rear direction is used to assume the calculation of the eccentric position θ1. Hereinafter, in particular, a specific algorithm for the assumed eccentric position θ1 of 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 temporal change of the acceleration calculated based on the acceleration and the pulse signal ps obtained by the proximity switch 14. In FIG. 12, for the sake of convenience, the assumed eccentric position θ1 is calculated from the time difference t1 between the maximum value (Ymax) of the acceleration in the front-rear direction obtained by the acceleration sensor 12 and the pulse signal ps. Incidentally, in the present embodiment shown in FIG. 12, as an example, a scheme of calculating the assumed eccentric position θ1 based on the maximum value (Ymax) and the minimum value (Ymin) of the acceleration is shown as In another embodiment of the present invention, the assumed eccentric position θ1 may be calculated from any one or more of the acceleration zero point, the maximum value (Ymax) of the acceleration, and the minimum value (Ymin).

Fig. 13 is a flowchart showing a process of measuring an eccentric amount/assumed eccentric position.

(Step SP21)

In step SP21, the central control unit 31 detects the left and right direction, the front and rear directions by the acceleration sensor 12. Acceleration (X, Y, Z) in the direction and in the up and down direction.

(Step SP22)

In step SP22, the central control unit 31 performs the determination of the maximum acceleration (X, Y, Z) based on the acceleration (X, Y, Z) obtained by the acceleration sensor 12 and the pulse signal ps, which is an interruption signal from the proximity switch 14. Calculation processing of values (Xmax, Ymax, Zmax)/minimum values (Xmin, Ymin, Zmin). The specific scheme will be explained later.

(Step SP23)

In step SP23, the central control unit 31 calculates and determines the value of one cycle t2, which is the time when the drum 2 makes one rotation, based on the interval between the plurality of pulse signals ps as the interruption signals from the proximity switch 14.

(Step SP24)

In step SP24, the central control unit 31 is based on the plurality of pulse signals ps as the interrupt signals from the proximity switch 14 and the maximum values (Xmax, Ymax, Zmax) of the accelerations (X, Y, Z) obtained in step SP22. Calculate and determine the time difference t1. In step SP24, the central control unit 31 calculates the time difference t1_X and t1_Z in the horizontal direction and the vertical direction in addition to the time difference t1 in the front-rear direction shown in FIG. 12, that is, the time difference t1_Y.

(Step SP25)

In step SP25, the central control unit 31 calculates and determines as the maximum value (Xmax, Ymax, max)/minimum value (Xmin, Ymin, Zmin) of the acceleration (X, Y, Z) obtained in step SP22. The eccentricity amounts Mx, My, and Mz of the eccentric amount (M) in the left-right direction, the front-rear direction, and the up-and-down direction. In the present embodiment, the eccentric amounts Mx, My, and Mz are obtained from the difference between the maximum value (Xmax, Ymax, Zmax) and the minimum value (Xmin, Ymin, Zmin).

(Step SP26)

In the step SP26, the central control unit 31 calculates and determines the assumed eccentric position θ1-X of the left and right direction, the front-rear direction, and the up-and-down direction by the following equation based on the period t2 obtained in step SP23 and the time difference t1 obtained in step SP24. θ1-Y, θ1-Z.

θ1-X=t1_X×360÷t2

θ1-Y=t1_Y×360÷t2

θ1-Z=t1_Z×360÷t2

Fig. 14 is a view specifically showing maximum values (Xmax, Ymax, Zmax) of the determined accelerations (X, Y, Z) Flowchart of the calculation process of the /minimum value (Xmin, Ymin, Zmin). The values of the accelerations (X, Y, and Z) actually input from the acceleration sensor are input every one millisecond, but there is a tendency to exhibit a large fluctuation from the maximum to the minimum while repeating the input value. Further repeated subtle fluctuations. Therefore, in the present embodiment, the central control unit 31 performs the calculation processing by using the moving average of the plurality of input values as the acceleration (X1, Y1, Z1) for the calculation processing. Thereby, the above-described fine fluctuations reduce the influence on the calculation processing of the central control unit 31.

(Step SP221)

In step SP221, the central control unit 31 performs the calculation of the 16 moving averages of the input accelerations (X, Y, Z) twice in parallel, and recognizes these moving average values obtained every 16 milliseconds as acceleration (X1, Y1). , Z1), continue to enter. Specifically, as an example, the central control unit 31 calculates and inputs a moving average value based on the first to theteenteenth and seventeenth to thirty-eightth input values, and in parallel with the second to theteenth and eighteenth to eighteenth Enter the value to calculate the moving average as the second value. Thereby, in the calculation process, any moving average of the first time and the second time can be used. Specifically, for example, even if the moving average value obtained from the first to the 16th input values cannot be calculated for any reason, the moving average value can be calculated from the second to 17th input values and supplied to the calculation. deal with.

(Step SP222)

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

(Step SP223)

In step SP223, the central control unit 31 updates the acceleration (X1, Y1, Z1) continuously input in step SP221 to a temporary maximum value/minimum value at any time.

(Step SP224)

In step SP224, the central control section 31 accepts the next pulse signal ps of the pulse signal ps obtained by the step SP222 obtained by the proximity switch 14.

(Step SP225)

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

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

(Step SP31)

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

(Step SP32)

In step SP32, the central control unit 31 determines whether or not the eccentric amount Mxz is higher than the threshold M_xz which is the first eccentric amount threshold (ma). When the eccentric amount Mxz is lower than the threshold value M_xz, the central control unit 31 proceeds to step SP33. When the eccentricity amount Mxz is higher than the threshold value M_xz, the central control unit 31 determines that the eccentricity amount Mxz is not operative, and proceeds to step SP5 to perform the eccentricity amount adjustment processing.

(Step SP33)

In step SP33, the central control unit 31 determines whether or not the eccentric amount My in the front-rear direction is higher than the threshold M_y which is the first eccentric amount threshold (ma). When the eccentric amount My is lower than the threshold value M_y, the central control unit 31 determines that activation is possible. In this case, the number of revolutions of the drum 2 is increased. When the eccentricity amount My is higher than the threshold value M_y, the central control unit 31 determines that the eccentricity amount is not activated, and proceeds to step SP5 to perform the eccentricity amount adjustment processing.

Next, another embodiment of the startup determination will be described with reference to Fig. 16 . In the present embodiment, the central control unit 31 appropriately changes the threshold value M_xz and the threshold value M_y for the start determination based on the eccentric state of the drum 2, and performs the start determination.

In the present embodiment, with respect to step SP3 as the first eccentricity detecting step, the first eccentric amount threshold (ma) is set to be smaller than the non-opposing load when in the state of the opposite load as shown in FIG. The value of the state. Further, in the present embodiment, when the load is not in the opposite state, the first eccentric amount threshold (ma) is set differently according to the assumed eccentric position θ1.

The central control unit 31 selectively reads out 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 respectively stored in the memory 32 as the first eccentricity amount threshold value (ma) used in the present embodiment. Among the thresholds, the threshold M_xz1 and the threshold M_y1 are the largest values, and the threshold M_xz3 and the threshold M_y3 are the lowest values.

The startup determination shown in Fig. 16 will be described. The central control unit 31 performs the processing of the above-described step SP31. Then, the process moves 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 in the front-rear direction. If the value of the eccentricity Mxz is small, the central control unit 31 Go to step SP35. When the value of the eccentric amount Mxz is large, the central control unit 31 proceeds to step SP36.

(Step SP35)

In step SP35, the central control unit 31 reads out the threshold value M_xz3 and the threshold value M_y3 from the memory 32 as the first eccentricity amount threshold value (ma) used in the subsequent steps SP32 and SP33. In other words, in the present embodiment, when it is determined that the drum 2 is in the state of the opposing load, the central control unit 31 sets the first eccentric amount threshold (ma) as compared with when the setting is performed when the load is not opposed. Set to a lower value. Therefore, when the drum 2 is in the state of the opposing load, it is most easy to move to the eccentric position adjustment processing also called tumbling.

(Step SP36)

In step SP36, the central control unit 31 reads out which of the regions Y indicated by the parameter table of Fig. 5 the assumed eccentric position θ1 stored in the memory 32 is. When it is judged that the assumed 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), the central control unit 31 proceeds to step SP38. When it is judged that the assumed 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), the central control unit 31 proceeds to step SP37.

(Step SP37)

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

(Step SP38)

In step SP38, the central control unit 31 reads out the threshold value M_xz1 and the threshold value M_y1 from the memory 32 as the first eccentricity amount threshold value (ma) used in the subsequent steps SP32 and SP33. In the present embodiment, a different first eccentric amount threshold (ma) is set based on the assumed eccentric position θ1 in step SP3 as the first eccentricity detecting step. Specifically, when the eccentric position θ1 is assumed to be located in the region P(A), P(B), or P(C), the eccentric amount threshold (ma) is set to be small, and when the eccentric position θ1 is assumed to be located in the region P (AB) When P(BC) or P(CA), the eccentricity threshold (ma) is set to be large.

Then, the central control unit 31 performs steps SP32 and SP33 in the same manner as in FIG. 15 using the threshold values used in steps SP35, SP37, and SP38.

The above description of the process of the pre-dehydration process in the dehydration process is completed. Hereinafter, the processing of the main dehydration process after the above step SP6 will be described. Here, since the processing of step SP7 and step SP8 has been described above, the specific processing of step SP6, that is, the water filling process will be mainly described.

Fig. 17 is a flow chart showing an outline of a water injection process. Thus, in the water injection process of the present embodiment, In the step SP2, which is the eccentric amount/assumed eccentric position measurement process, which is continued after the rotation speed of the drum 2 reaches 180 rpm as described above, mainly the process of determining the eccentric position in step SP61 and the process of performing the water injection in step SP62 are mainly performed.

(Step SP61)

In step SP61, the central control unit 31 determines the formal eccentric position θ2 based on the assumed eccentric position θ1. The processing of the eccentric position determination will be described later.

(Step SP62)

In step SP62, the central control unit 31 performs water injection into the lifting rib 7 based on the eccentric amount (M) and the formal eccentric position θ2 obtained in step SP61. The processing of the water injection implementation will be described later.

Fig. 18 is a flow chart showing a specific processing procedure of the water flooding process of the present embodiment. An example of the flow from the process of measuring the eccentric amount/assumed eccentric position in step SP2, which is continued from the rotation speed of the drum 2 to 180 rpm, to the above-described step 61 is described.

In step 63, the central control unit 31 selects a larger value of the eccentricity amount Mx in the left-right direction and the eccentricity amount Mz in the vertical direction 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 the eccentric amount Mxz.

(Step SP64)

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

(Step SP65)

In step SP65, the central control unit 31 determines whether or not the eccentric amount My in the front-rear direction is higher than the threshold value M_y4 which is the eccentricity threshold value (mb) for water injection. When the eccentric amount My is lower than the threshold value M_y4, the central control unit 31 does not perform the calculation of the eccentric amount (M). In other words, the central control unit 31 determines that the eccentric amount (M) in this case is a value that does not require water to be poured into the lifting rib 7 . In this case, the central control unit 31 increases the number of revolutions of the drum 2. When the eccentric amount My is higher than the threshold M_y, the central control unit 31 moves to step SP66.

(Step SP66)

In step SP66, the central control unit 31 maintains the number of revolutions of the drum 2 without rising. Then, the central control unit 31 performs the above-described step SP61, that is, the process of determining the eccentric position, and the step SP62, that is, the process of water injection.

(Step SP67)

In step SP67, the central control unit 31 maintains the number of revolutions of the drum 2 without rising. Then, 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, the control method according to the present embodiment is characterized in that the eccentric amount (M) is calculated based on signals from the plurality of directions including the front-rear direction of the acceleration sensor 12, and based on the official eccentric position θ2. The process of performing the water injection is performed, and the official eccentric position θ2 is determined based on the calculated eccentric amount (M) being a signal equal to or higher than the eccentricity threshold (mb) for water injection.

The process of officially determining the eccentric position will be described with reference to Figs. 19 and 20 . Fig. 19 is a flow chart showing the processing procedure for the eccentric position to be formally determined. Fig. 20 is a view showing the relationship between the eccentric amount (M) shown in Fig. 19 and the first threshold and the second threshold. The memory 32 stores the data of Fig. 20 and appropriately reads out the required data according to the situation. In addition, the unit of the number of the eccentric amount Mx, My, and Mz which are the eccentric load amount in FIG. 20 is gram (g). Further, the unit of the numbers of the first thresholds a1, b1, c1 and the second thresholds a2, b2, c2 in the same figure is rpm.

As shown in FIG. 20, it is assumed that the eccentric position θ1 corresponds to the formal eccentric position θ2, but the relationship between the eccentric position θ1 and the formal eccentric position θ2 is assumed to be different depending on the number of revolutions of the drum 2. In the present embodiment, the flow for calculating the formal eccentric position θ2 is changed in accordance with the eccentric amount (M) and the rotational speed of the drum 2. Specifically, when the rotation speed of the drum 2 is at a rotation speed lower than the first threshold values a1, b1, c1; the rotation speed of the drum 2 is above the first threshold values a1, b1, c1 and lower than the second threshold values a2, b2, c2 At the time of the rotational speed; and when the rotational speed of the drum 2 is at the rotational speeds of the second threshold values a2, b2, c2 or more, the equation for calculating the formal eccentric position θ2 is changed.

(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 eccentricities Mx, My, Mz as shown in Fig. 20, respectively. In other words, the central control unit 31 reads out the first threshold values a1, b1, c1 and the second threshold values a2, b2, and c2 corresponding to the eccentricities Mx, My, and Mz from the memory 32.

(Step SP612)

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

(Step SP613)

In step SP613, the central control unit 31 directly determines the value of the assumed eccentric position θ1 as the value of the formal eccentric position θ2.

(Step SP614)

In step SP614, the central control unit 31 determines whether or not the rotational 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 moves to step 615. When the number of rotations of the drum 2 is equal to or greater than the first threshold values a2, b2, and c2, the central control unit 31 proceeds to step 616.

(Step SP615)

In step SP615, the central control unit 31 determines a value obtained by subtracting 90° from the assumed eccentric position θ1 as the value of the formal eccentric position θ2. In this case, when the value of the official eccentric position θ2 becomes lower than 0, the central control unit 31 sets the value added by 360° as the formal eccentric position θ2.

(Step SP616)

In step SP616, the central control unit 31 determines a value obtained by subtracting 180° from the assumed eccentric position θ1 as a value of the formal eccentric position θ2. In this case, when the value of the official eccentric position θ2 becomes lower than 0, the central control unit 31 sets the value added by 360° as the formal eccentric position θ2.

The processing performed by the water injection shown in step SP62 will be described. Fig. 21 is a flow chart showing the processing procedure of the water injection implementation.

(Step SP621)

In step SP621, the central control unit 31 sets the larger value of the eccentricity amount Mx in the left-right direction and the eccentricity amount Mz in the vertical direction determined by the above-described step SP25 as the eccentric amount Mxz. In addition to this, the central control unit 31 determines whether or not the value of the eccentric amount Mxz is larger than the eccentric amount My. When the eccentric amount Mxz is large, the central control unit 31 proceeds to step SP622. When the eccentric amount Mxz is small, the central control unit 31 moves 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 a larger value of the eccentric amount Mx and the eccentric amount Mz is used for 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 used for water injection.

(Step SP624)

In step SP624, the central control unit 31 performs processing of the water supply valve drive. The specific process of the treatment of the water supply valve drive will be described later.

(Step SP625)

In step SP625, the central control unit 31 performs a process of determining whether or not the water supply amount to the lifting rib 7 is appropriate. The specific process for this processing will be described later.

(Step SP626)

In step SP626, the central control unit 31 determines that any of the lifting ribs 7 is not full of water in the process of determining the water supply amount in step SP625, and proceeds to step SP627. Further, when the central control unit 31 determines that any of the lifting ribs 7 is full of water in the process of determining the water supply amount in step SP625, the central control unit 31 shifts to SP632.

(Step SP627)

In step SP627, the central control unit 31 performs a determination as to whether or not the eccentric amount (M) is increased, that is, the eccentric amount increase determination, when water injection is performed to reduce the eccentric amount (M). The specific process for determining the eccentricity increase will be described later.

(Step SP628)

In step SP628, the central control unit 31 determines whether or not there is M increase information (NG) as the eccentricity increase information in the eccentricity increase determination in step SP627. When there is no M addition information (NG), the central control unit 31 moves to step SP631. When there is M addition information (NG), the central control unit 31 moves to step SP629.

(Step SP629)

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

(Step SP630)

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

(Step SP631)

In step SP631, the central control unit 31 performs an acceleration determination of whether or not to accelerate the rotational speed of the drum 2. The specific process for determining the feasibility of acceleration will be described later.

(Step SP632)

In step SP632, the central control unit 31 performs a determination criterion for changing whether or not to accelerate the drum 2. Accelerate the process of determining the change. The specific process for this processing will be described later.

In the present embodiment, as described above, the data for determining the eccentric position θ2 is changed to other data in step SP630. However, even if water is injected into the lifting rib 7 based on the data of the determined eccentric position θ2 after the change, it is not seen. When the eccentric amount (M) is lowered, the arrangement of the laundry in the drum 2 is changed by the control of the eccentric position adjustment processing in the above-described step SP5, and the re-dehydration process is started.

Next, a specific procedure of the process of the water supply valve drive of the above-described step SP624 will be described with reference to Fig. 22 .

(Step SP633)

In step SP633, the central control unit 31 acquires the official eccentric position θ_fix for driving 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 amounts Mx, My, and Mz. Further, in the present embodiment, as shown in FIG. 5, the normal eccentric position θ_fix is expressed as a relative angle of any imaginary line extending in the circumferential direction from the axis S1 as shown in FIG. 5, and is expressed as 0° to 359°. Any value of 0 to 359 is shown in FIG.

(Step SP634)

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

(Step SP635)

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

(Step SP636)

In step SP636, the central control unit 31 determines whether or not the condition that the formal eccentricity position θ_fix is 10 or more and 110 or less is satisfied.

When the above conditions are met, the central control unit 31 moves to step SP637. When the above conditions are not satisfied, the central control unit 31 moves to step SP638.

(Step SP637)

In step SP636, the central control unit 31 determines that the official eccentric position θ_fix is in the region P(AB) shown in FIG. 5, and simultaneously drives the water supply valves 62a and 62b to supply water to the lifting ribs 7 (A) and 7 (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 a value of 110 or more and 130 or less is satisfied. When the above conditions are met, the central control unit 31 moves to step SP639. When the above conditions are not satisfied, the central control unit 31 moves to step SP640.

(Step SP639)

In step SP639, the central control unit 31 determines that the official eccentric position θ_fix is in the region P(B) shown in Fig. 5, and simultaneously drives the water supply valve 62b to supply water to the lifting rib 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 a value of 130 or more and 230 or less is satisfied. When the above conditions are met, the central control unit 31 moves to step SP641. When the above conditions are not satisfied, the central control unit 31 moves to step SP642.

(Step SP641)

In step SP641, the central control unit 31 determines that the official eccentric position θ_fix is in the region P(BC) shown in Fig. 5, and simultaneously drives the water supply valves 62b and 62c to supply water to the lifting ribs 7 (B) and 7 (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 moves to step SP643. If the above conditions are not met, the central control unit 31 moves to step SP644.

(Step SP643)

In step SP643, the central control unit 31 determines that the official eccentric position θ_fix is in the region P(C) shown in Fig. 5, and simultaneously drives the water supply valve 62c to supply water to the lifting rib 7 (C).

(Step SP644)

In the step SP644, the central control unit 31 determines that the value of the formal eccentricity position θ_fix is 250 or more and 350 or less, and the process proceeds to step SP645.

(Step SP645)

In step SP645, the central control unit 31 determines that the official eccentric position θ_fix is in the region P (CA) shown in Fig. 5, and simultaneously drives the water supply valves 62c and 62a to supply water to the lifting ribs 7 (C) and 7 (A).

In the present embodiment, the calculation of the driving of the water supply valve shown in FIG. 22 is performed, and the calculation and determination of the assumed eccentric position θ1 and the formal eccentric position θ2 are always performed. Therefore, it goes without saying that the steps SP637, SP641, and SP645 corresponding to the simultaneous water injection step of the present invention are moved to the switching ribs 7 corresponding to the water injection into the single lifting rib 7 (A), (B) or (C). Steps of the water injection switching step of the present invention SP635, SP639 or SP643.

Next, a specific procedure of the process of determining the water supply amount in the above-described step SP625 will be described with reference to Fig. 23 .

(Step SP646)

In step SP646, the central control unit 31 accumulates the respective driving times of the water supply valves 62a, 62b, and 62c.

(Step SP647)

In step SP647, the central control unit 31 converts the water supply amount of each of the water supply valves 62a, 62b, and 62c based on the integration of the driving time.

(Step SP648)

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

(Step SP649)

In step SP649, the central control unit 31 determines that the lifting rib 7 (A) supplied with water by the water supply valve 62a is full of water, and transmits information indicating "YES" at the processing of step SP626 shown in Fig. 21 .

(Step SP650)

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

(Step SP651)

In step SP651, the central control unit 31 determines that the lifting rib 7 (B) supplied through the water supply valve 62b is full of water, and transmits information indicating "YES" at the processing of step SP626 shown in FIG.

(Step SP652)

In step SP652, the central control unit 31 determines whether or not the accumulated water supply amount of the water supply valve 62c has reached 1000 g. When it is determined that the cumulative water supply amount has reached 1000 g, the central control unit 31 proceeds to step SP653. When it is determined that the cumulative 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 lifting rib 7 (C) supplied with water by the water supply valve 62c is full of water, and transmits information indicating "YES" at the processing of step SP626 shown in Fig. 21 .

(Step SP654)

In step SP654, the central control unit 31 determines that any one of the lifting ribs 7 (A), 7 (B), and 7 (C) supplied through the water supply valves 62a, 62b, and 62c is not full of water, and is in the procedure shown in FIG. When the SP626 is processed, information indicating "No" is transmitted.

Next, the eccentric amount increase determination shown in step SP627 will be described. Fig. 24 is a flowchart showing a processing procedure of the eccentric amount increase determination.

(Step SP655)

In step SP655, the central control unit 31 determines whether or not the eccentricities Mx, My, and Mz have decreased when the time period of water supply by the water supply valves 62a, 62b, and 62c has elapsed for 5 seconds. When it is determined that the eccentricities Mx, My, and Mz have decreased, the central control unit 31 proceeds to step SP656. When it is determined that the eccentricities Mx, My, and Mz have not decreased, the central control unit 31 proceeds to step SP657. Here, the criterion for determining whether or not the eccentricities Mx, My, and Mz have decreased is not necessarily limited to the eccentric amount (M) used in the calculation of the formal eccentric position θ_fix. For example, it may be determined based on the sum (difference) of the eccentric amount Mx and the eccentric amount My, or may be determined based on the sum (difference) of the eccentric amount Mz and the eccentric amount My.

(Step SP656)

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

(Step SP657)

In step SP657, the central control unit 31 determines that the amount of eccentricity (M) has increased, and proceeds to step SP658.

(Step SP658)

In the step SP658, the central control unit 31 transmits the M increase information (NG) which is the eccentric amount increase information as the predetermined signal, and performs the determination of "YES" in the step SP628 in Fig. 21 .

Next, the acceleration availability determination shown in step SP631 will be described. Fig. 25 is a flowchart showing a processing procedure of the acceleration possibility determination.

(Step SP659)

In step SP659, the central control unit 31 determines whether or not the eccentric amount Mxz is smaller than the rotation speed. The threshold m_xz5 of the threshold (mc) is used. When it is determined that the eccentric amount Mxz is smaller than the threshold value m_xz5, the central control unit 31 proceeds to step 660. When it is determined that the eccentric amount Mxz is not smaller than the threshold value m_xz5, the central control unit 31 determines that the acceleration cannot be accelerated, and proceeds to step SP625 to continue supplying water to the lifting rib 7.

(Step SP660)

In step SP660, the central control unit 31 determines whether or not the eccentric amount My is smaller than the threshold m_y5 which is the threshold for increasing the rotational speed (mc). When it is determined that the eccentric amount My is smaller than the threshold value m_y5, the central control unit 31 determines that the acceleration of the drum 2 can be accelerated and resumed. When it is determined that the eccentric amount My is not smaller than the threshold value m_y5, the central control unit 31 determines that the acceleration cannot be accelerated and proceeds to step SP625 to continue supplying water to the lifting rib 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, the acceleration sensor 12 employs a triaxial acceleration sensor 12 that can detect accelerations in the horizontal direction, the vertical direction, and the front-rear direction, respectively. Further, in the present embodiment, different water injection eccentricity threshold values (mb) and rotational speed increase threshold values (mc) are set for each of the three acceleration directions. Further, in the present embodiment, the difference between the eccentricity threshold value (mb) for water injection and the threshold value (mc) for increasing the rotational speed is set to gradually or gradually decrease as the number of revolutions increases. In addition, in the present embodiment, the difference between the eccentric amount threshold (m) of the water injection and the threshold (mc) for increasing the rotational speed is gradually or stepwise as the eccentric amount (M) of the drum 2 increases. The land becomes bigger.

Next, the processing of the acceleration determination change shown in step SP632 will be described. FIG. 26 is a flowchart showing a processing procedure of the acceleration determination change.

(Step SP661)

In the step SP661, the central control unit 31 changes the threshold value m_xz5 and the threshold value m_y5 which are the rotational speed increase thresholds (mc) used in the acceleration determination of the step SP631 to the eccentricity allowable threshold (md) which is a larger value. The threshold m_xz6 and the threshold m_y6 are shifted to step SP631. The central control unit 31 performs the acceleration availability determination of step SP631 using the threshold value m_xz6 and the threshold value m_y6.

(Step SP662)

In step SP662, the central control unit 31 determines whether or not acceleration is possible by determining the acceleration availability of step SP631 by using the eccentric amount allowable threshold value (md), which is changed in step SP661, that is, the threshold value m_xz6 and the threshold value m_y6. When the result of the acceleration determination is accelerated, the central control unit 31 accelerates the drum 2. In the case where the result of the acceleration determination is not accelerated, the central control unit 31 It is judged that the dehydration process is difficult to continue, and the eccentric position adjustment processing of the above step SP5 is performed.

As described above, in step SP5, the central control unit 31 agitates the laundry in the drum 2 in the vertical direction by stopping the rotation of the drum 2 or reducing the number of revolutions of the drum 2 to a rotation speed higher than the centrifugal force. Then, the dehydration process is started again from step SP1.

As described above, in the control method of the drum washing machine 1 of the present embodiment, when the eccentric amount (M) reaches the predetermined water injection eccentric amount threshold value (mb) during the dehydration process, the eccentric position is determined as the eccentric position (N). The lifting rib 7 corresponding to θ2 is injected with water to reduce the eccentric amount (M), and then the rotation speed of the drum 2 is brought to a predetermined dehydration stable rotation speed. The control method of the drum washing machine 1 is characterized in that: a simultaneous water injection step, except when determining the eccentric position When θ2 is located at a substantially opposite position of the lifting rib 7 with respect to the axis S1, water is simultaneously injected into the two lifting ribs 7; the water injection switching step continues to calculate the eccentric amount (M) and determine the eccentric position θ2 in parallel with the simultaneous water injection step, and When it is determined that the eccentric position θ2 changes to substantially the opposite position of any of the lifting ribs 7, the switching is made to inject water to one of the lifting ribs 7 on the substantially opposite side; and the rotation speed rising step changes in the eccentric amount (M) according to the rotation speed of the drum When the rotation rise threshold value (mc) or less is used, the water supply to the lifting rib 7 is stopped, and the rotation speed of the drum 2 is increased.

That is, according to the present embodiment, by introducing the simultaneous water injection step and the water injection switching step, the eccentric amount (M) can be accurately reduced in a short time. As a result, the dehydration process can be further shortened.

Further, the accumulated value of the amount of water injected into the lifting ribs 7 is stored for each of the lifting ribs 7, and water injection exceeding the amount of the lifting ribs 7 is not performed. Therefore, by preventing water inflow in a futile manner, the dehydration process is further shortened. .

Further, in the present embodiment, when the water injection amount of the lifting rib 7 reaches the content amount of the lifting rib 7, the eccentric amount (M) is set to be smaller than the value set according to the rotation speed of the drum 2 When the eccentricity of the increase in the rotational speed increase threshold (mc) allows the threshold (md), the rotational speed is increased, and when the eccentric amount (M) is equal to or greater than the eccentricity allowable threshold (md), the dehydration process is stopped. Therefore, as long as it is an allowable amount of eccentricity (M), the dehydration process is maintained in a state of being maintained, whereby the delay of the dehydration time due to interruption or re-entry of the dehydration process is effectively avoided.

Further, in the present embodiment, when the eccentric amount (M) is increased from the start of the water injection to the lifting rib 7 corresponding to the eccentric position, the eccentric position calculated based on the signal according to the acceleration different from one direction ( N), water injection into the lifting rib 7 is performed, and therefore, the vain cost of determining the water injection time based on the erroneous determination of the eccentric position θ2 can be quickly avoided, and a more rapid dehydration process can be realized.

Further, in the present embodiment, when the eccentric amount does not decrease even after the change of the signal for determining the acceleration of the eccentric position θ2 is performed a plurality of times, the water is injected into the lifting rib 7 and the rotation speed of the drum 2 is lowered or the drum 2 is stopped. The rotation is performed to agitate the laundry in the drum 2 up and down in the drum 2, whereby the vain cost of determining the water injection time based on the erroneous determination of the eccentric position θ2 is quickly avoided, and the delay of the dehydration process is effectively reduced.

Although an embodiment of the present invention has been described above, the configuration of the present embodiment is not limited to the above configuration, and various modifications can be made.

For example, in the above-described embodiment, as the washing machine, an example in which the present invention is applied to a so-called inclined drum automatic washing machine suitable for home use has been disclosed, but it is undoubtedly even a horizontal type which is widely applicable to a laundromat shop. The washing and drying machine of the present invention can also be applied.

Further, for example, in the above-described embodiment, the configuration in which the lifting ribs 7 are provided in three is disclosed, but it is needless to say that a configuration having four or more lifting ribs 7 may be employed. Further, it is needless to say that the lifting ribs 7 do not necessarily need to be arranged at equal angular intervals along the circumferential direction of the drum 2, and it is not necessary to have the same shape.

Further, in the above-described embodiment, the acceleration sensor 12 is provided with a three-axis acceleration sensor capable of detecting accelerations in the left-right direction, the vertical direction, and the front-rear direction, but it is also possible to detect only the up-and-down direction, the left-right direction, and the front-rear direction by mounting a plurality of them. An acceleration sensor of acceleration in either direction constitutes the acceleration sensor 12.

Other configurations may be variously modified without departing from the spirit of the invention.

Claims (5)

1. A control method of a drum washing machine, wherein

   The drum washing machine has a bottomed cylindrical drum configured to be rotatable about an axis extending in a horizontal direction or an oblique direction, and a hollow lifting rib disposed on an inner circumferential surface of the drum along an axial direction of the drum There are three or more; a water receiving unit for injecting water into each of the lifting ribs; an acceleration sensor for detecting vibration of the drum; and an eccentricity detecting portion that detects the vibration of the drum detected by the acceleration sensor The amount of eccentricity and eccentricity in the drum,

   In the dehydration process, when the eccentric amount reaches the predetermined eccentricity threshold for water injection, the eccentric amount is decreased by injecting water to the lifting rib corresponding to the eccentric position, and then the rotation speed of the drum is brought to a predetermined dehydration stable rotation speed.

   The control method of the drum washing machine is characterized by having:

   At the same time, the water injection step, in addition to when the eccentric position is located at a substantially opposite position of the lifting rib relative to the axis, simultaneously injecting water to two or more lifting ribs;

   a water injection switching step of continuously calculating the eccentric amount and the eccentric position in parallel with the simultaneous water injection step, and switching to injecting water to a lifting rib on a substantially opposite side when the eccentric position changes to a substantially opposite position of any of the lifting ribs;

   When the eccentricity amount is equal to or less than the threshold for the rotation increase that changes according to the number of revolutions of the drum, the step of increasing the number of revolutions stops the injection of water into the lift rib and increases the number of revolutions of the drum.
2. A control method of a drum washing machine according to claim 1, wherein

   The cumulative amount of water injected into the lifting rib is stored for each lifting rib, and no water injection exceeding the content amount is performed for each lifting rib.
3. A method of controlling a drum washing machine according to claim 1 or 2, characterized in that

   When the eccentric amount when the water injection amount of the lifting rib reaches the content amount of the lifting rib is smaller than the eccentric amount allowable threshold value set to be larger than the value of the rotation rising threshold, the spin speed is increased,

   When the eccentric amount when the water injection amount of the lifting rib reaches the content amount of the lifting rib is equal to or higher than the eccentric amount allowable threshold, the dehydration process is stopped.
4. A method of controlling a drum washing machine according to claim 1 or 2, characterized in that

   The acceleration sensor is a sensor capable of detecting accelerations in the left and right direction, the up and down direction, and the front and rear directions.

   Calculating the eccentric amount and the eccentric position according to the signal of the acceleration in any one direction, and based on the acceleration according to the direction different from the one direction when the eccentric amount increases from a water injection to the lifting rib corresponding to the eccentric position for a certain time The signal is used to calculate the eccentric position, and water is injected into the lifting rib.
5. A method of controlling a drum washing machine according to claim 4, wherein

   When the eccentric amount does not decrease even after the signal for calculating the acceleration of the eccentric position is calculated a plurality of times, the water is stirred up and down in the drum by stopping the water injection into the lifting rib and lowering the rotation speed of the drum or stopping the rotation of the drum. The laundry in the drum.

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