WO2019100695A1

WO2019100695A1 - Drum washing machine

Info

Publication number: WO2019100695A1
Application number: PCT/CN2018/090760
Authority: WO
Inventors: 川口智也; 佐藤弘树; 北川宏之
Original assignee: 青岛海尔洗衣机有限公司; Aqua株式会社
Priority date: 2017-11-21
Filing date: 2018-06-12
Publication date: 2019-05-31
Also published as: CN111373087A; JP7178651B2; JP2019092706A

Abstract

Provided by the present invention is a drum washing machine which is capable of reliably reducing an imbalance in a washing drum when removing water even when laundry items within the washing drum are offset, removing water rapidly so as to shorten washing time. The washing machine (1) of the present invention is characterized in: a feeding port sealing element (PK), and a washing main body (1a) which is connected to an external drum (3) in order to seal water and which serves as a frame; a proximity switch (14) which serves as as a location detection device for a hollow balancer within a drum, wherein a drum (2) within the external drum (3) generates a signal once per each rotation; a single acceleration sensor (12), which is used for detecting the vibration of the external drum; a central control part (31) which serves as an eccentric position detection unit, detecting eccentric positions (N) in the forward and backward direction, upward and downward direction and left and right direction of the drum (2); the washing machine (1) considers a phase difference generated by the difference between the eccentric positions (N) of the drum (2) in the forward and backward direction so as to calculate the eccentric positions (N) in the upward and downward direction and left and right direction.

Description

Drum washing machine

Technical field

The present invention relates to a drum type washing machine having a dehydrating function.

Background technique

In a washing machine such as a general household or a laundromat, there is a washing machine having a washing and dehydrating function and a washing and dehydrating drying function.

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

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

In order to cancel the cumbersome operation, when it is determined that the magnitude of the imbalance as the offset of the laundry is larger than a predetermined value, the drum is decelerated according to the output timing of the position detecting unit until the centrifugal force is less than the gravity. A technique for eliminating the offset of the laundry (refer to Patent Document 1).

In addition, in order to prevent the imbalance of the laundry from deviating toward the front of the drum during dehydration, it is proposed to calculate the difference between the detected vibration amounts by accumulating the acceleration sensors disposed on the front and the rear of the drum, and to bias the laundry. A technique of sensing the unbalanced state of the front portion of the drum (refer to Patent Document 2).

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

Summary of the invention

Problems to be solved by the invention

In the technique disclosed in Patent Document 1, the centrifugal force is lowered by decelerating the rotation of the drum, and the laundry that overlaps each other falls by gravity. However, in this prior art, the laundry which is entangled with each other is directly dropped, and thus the mass 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, in the technique disclosed in Patent Document 2, when the drum is rotated, the difference between the vibration value detected by the front vibration detecting unit and the vibration value detected by the rear detecting unit is calculated. Then, in a case where the difference between the vibration values exceeds a preset threshold value, the rotation of the drum is decelerated or stopped.

However, even with this prior art, the laundry that is entangled with each other is not unwound and remains in the drum, and is not a fundamental solution to eliminate the imbalance.

Therefore, the technique described in Patent Document 3 is expected to solve the problems that cannot be solved in the two patent documents. Then, it is currently desired to provide a further specific control flow, specific configuration for actively solving the problem.

The present invention has been made to solve the conventional problems. According to the present invention, it is possible to provide a drum type washing machine capable of reliably reducing the imbalance of the washing tub during the dehydrating process and rapidly performing the dehydration process even if there is a bias of the laundry in the washing tub, thereby being shortened Washing time.

Solution to solve the problem

The drum type washing machine of the present invention is characterized in that it has an inlet port seal, an outer cylinder and a frame for water sealing, and a drum position detecting device that generates a signal every time the drum rotates; a single acceleration sensor is used for detecting the outside The eccentric position detecting means detects the eccentric position in the front-rear direction, the up-and-down direction, and the left-right direction of the drum, and the drum-type washing machine calculates the eccentric position in the up-down direction and the left-right direction in consideration of the eccentric position of the drum in the front-rear direction. Here, the "front-rear direction" refers to a direction from the opening toward the rear wall in the horizontal direction when the opening of the washing machine is viewed from the front view, and the "up-and-down direction" is synonymous with the vertical direction, and the "left-right direction" means The direction perpendicular to the front-rear direction in the horizontal direction.

Further, the drum type washing machine is characterized in that the eccentric position detecting means measures the difference between the motor rotation speed during the constant speed rotation of the drum, the motor current change value, and the amplitude value from the vertical direction and the left and right direction of the acceleration sensor.

In the drum type washing machine, the eccentric position detecting means in the front-rear direction of the drum is measured based on the difference between the amplitude values of the vertical direction and the left-right direction from the acceleration sensor and the amplitude values of the front-rear direction in the constant-speed rotation of the drum.

The drum type washing machine is characterized in that the eccentric position detecting means in the front-rear direction of the drum is measured in accordance with the difference in the rate of change of the phase with the increase in the number of revolutions.

Effect of the invention

The drum type washing machine of the present invention comprises: a frame; an outer cylinder fixed to the frame; an inlet seal, the outer cylinder and the frame are connected for water sealing; and the drum is rotatably supported in the outer cylinder, the drum type washing machine The utility model is characterized in that: a drum position detecting device, a signal is generated once every one rotation of the drum; a single acceleration sensor is used for detecting the vibration of the outer cylinder; and an eccentric position detecting unit detects the eccentricity in the front-rear direction, the up-and-down direction and the left-right direction of the drum. In the position, the drum type washing machine calculates the eccentric position in the up and down direction and the left and right direction in consideration of the eccentric position of the drum in the front-rear direction.

Thereby, it is not necessary to use a plurality of acceleration sensors, and the eccentric position in the vertical direction and the left-right direction can be accurately measured regardless of the eccentric position of the drum in the front-rear direction.

In the drum type washing machine of the present invention, the eccentric position detecting means performs the difference between the motor rotation speed change value in the constant speed rotation of the drum, the motor current change value, the amplitude value from the left and right direction of the acceleration sensor, and the difference between the amplitude values in the up and down direction. Determination.

Thereby, the amplitude value in the left-right direction and the amplitude value in the vertical direction can be measured with higher accuracy.

In the drum type washing machine of the present invention, the eccentric position detecting means in the front-rear direction of the drum performs the amplitude value from the left-right direction of the acceleration sensor during the constant-speed rotation of the drum and the difference between the amplitude value in the vertical direction and the amplitude value in the front-rear direction. Determination.

Thereby, the amplitude value of the front-back direction can be measured with higher precision.

The drum type washing machine of the present invention is characterized in that the eccentric position detecting means in the front-rear direction of the drum is measured in accordance with the difference in the rate of change of the phase with the increase in the number of revolutions.

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 washing machine 1.

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

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

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 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 schematic flow chart showing a process of starting determination.

Fig. 13 is a schematic flow chart showing the processing of the water injection process.

Fig. 14 is a schematic flow chart showing the processing of the water injection process.

Fig. 15 is a schematic flow chart showing the processing of the water injection process.

Fig. 16 is a graph showing the relationship between the acceleration and the eccentric position N.

Fig. 17 is a graph showing the relationship between the difference between the left and right amplitudes and the front and rear amplitudes and the amount of eccentricity.

Fig. 18 is a graph showing the relationship between the temporary eccentric position θ1 and the formal eccentric position θ2 and the number of revolutions.

Detailed ways

Hereinafter, one 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 can be suitably used, for example, in a laundromat or a home. The washing machine 1 includes a washing machine body 1a as a frame, and the washing tub 1b includes an outer tube 3 having an axis S1 extending substantially horizontally and The drum 2; the water injection device 1c has a water receiving assembly 5 and a nozzle assembly 6; a driving device 40; and only the control unit 30 shown in Fig. 2. Then, the front end of the outer cylinder 3 is indirectly supported by the washing machine main body 1a as a frame via an inlet seal (hereinafter referred to as a seal PK) for water sealing. The seal PK has, for example, a synthetic resin having elasticity as a main body, and the elastic coefficient determined by the material, shape, hardness, and the like of the seal is stored in advance in the central control unit 31.

The washing machine body 1a shown in Fig. 1 has a substantially rectangular parallelepiped shape. An opening 11 for taking out/putting laundry with respect 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 figure, the main body 1a of the washing machine has a state in which its front surface 10a faces slightly upward, whereby the opening 11 for taking out/putting the laundry with respect to the drum 2 is formed to face obliquely upward, and the user is diagonally upward. The opening and closing cover 11a that can open and close the opening 11 is opened and closed. That is, the washing machine 1 of the present embodiment is referred to as a so-called inclined drum type automatic washing machine in which the washing tub 1b is attached in the oblique direction.

The outer cylinder 3 is a bottomed cylindrical member disposed inside the washing machine main 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 vertical direction, the horizontal 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 in the outer cylinder 3 and that is rotatably supported in the outer cylinder 3. The drum 2 can accommodate the laundry inside, and has a plurality of water-passing holes 2b on its wall surface 2a (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 extends toward the bottom 2c of the drum 2, and applies a driving force to the drum 2 to rotate the drum 2. Further, a proximity switch 14 capable of detecting the passage of the mark 15a formed on the pulley 15 is provided in the vicinity of one of the pulleys 15. Then, 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 proximal end portion 2c of the drum 2 across the distal 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 configured such that the water conduit 5a overlaps three layers in the radial direction, for example, 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 water conduit 5a is provided in the same number as the lifting rib 7, and a water passage path through which the adjustment water W flows to any of the lifting ribs 7 is formed inside. Then, 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 assembly 6 separately injects the adjustment water W into such a water conduit 5a. The nozzle assembly 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 conduit 5a, and are disposed at positions where water can be injected into the respective water conduits 5a. In addition, in this embodiment, tap water is used as the adjustment water W. Further, it is also possible to use a direction switching water valve as the

water supply valves

62a, 62b, 62c.

With such a configuration, during the dehydration process of opening the drain valve 50a and discharging the washing water in the outer cylinder 3 from the drain port 50, it is injected into the water conduit 5a of the water receiving unit 5 from any of the water injection nozzles 6a of the nozzle unit 6. The adjusted water W flows into the lifting rib 7 via the communicating member 5a1. For example, when the adjustment water W is injected from any of the water injection nozzles 6a as shown by the arrow in FIG. 1, the adjustment water W flows into the lifting rib 7 from the water conduit 5a via the communication member 5a1.

The lifting rib 7 has a retention portion 71 for retaining the adjustment water W injected from the tip end 1d side of the washing tub 1b by the water injection device 1c through the centrifugal force during the dehydration process, and an outlet portion 72 for supplying the adjusted water W from the washing tub The base end 1e side of 1b is discharged. When the drum 2 is in the high-speed rotation state, the adjustment water W flowing into the lifting rib 7 is adhered by the centrifugal force and stays on 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 pocket baffle structure capable of storing the water W by centrifugal force storage. Then, when the dehydration process is nearing the end 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 drained 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 without immersing 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 values detailed below that are lower than the resonance point CP of the drum 2. The first rotation speed (N1) of the predetermined rotation speed, the first eccentric amount threshold value (ma), the water injection eccentricity amount threshold value, the rotation speed increase threshold value, the eccentricity amount allowable threshold value, and the dehydration steady state rotation speed. Further, the microcomputer executes the program stored in the memory 32 by the control unit 30, thereby performing a predetermined operation operation, and temporarily storing the data or the like used when the program is executed in the memory 32.

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 rotations of the motor 10 from the motor control unit 34 as a control element in real time.

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 unbalance amount detecting unit 35 and the unbalanced position detecting unit 36 constitute an eccentricity detecting unit.

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

The unbalanced position detecting unit 36 calculates an angle in 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 means the relative angle with respect to the lifting rib 7 in the circumferential direction of the axis S1. In the present embodiment, as shown in FIG. 5, three lifting ribs 7 (A), 7 (B), and 7 (C) and eccentric positions which are arranged at equal angular intervals around the axis S1 are shown as an example. The relative angle of the lifting ribs 7 (B) and 7 (C) is set to 0 °.

When the signal indicating the eccentric amount (M) and the eccentric position (N) from the unbalance amount determining unit 37 and the unbalanced position detecting unit 36 is input, the water injection control unit 38 determines the lifting rib 7 of the water supply based on the control program stored in advance. 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 drum 2 generates an eccentric amount (M) equal to or greater than a predetermined standard, the water injection control unit 38 starts to inject the adjustment water W from the water injection nozzle 6a selected based on the calculation of the eccentric amount (M) to the water conduit 5a of the water receiving unit 5. When the eccentric amount (M) becomes equal to or lower than the predetermined reference, the injection of the adjustment water W is stopped.

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

In the present embodiment, in particular, in the case where the laundry group LD (Y) is located in the vicinity of any of the lifting ribs 7, a specific case in which water is required to be injected into the plurality of lifting ribs 7 in order to reduce the amount of eccentricity (M) is specifically described. control.

As shown in the parameter table of FIG. 4, the central control unit 31 opens the water supply valve X and the water supply valve Z. In the present embodiment, as shown in FIG. 5, for the special designation of the eccentric position (N), the eccentric position (N) of the lifting rib 7 to be water-injected is specifically designated by equally dividing the drum 2 in the circumferential direction. The situation and the case of specifying the eccentric position (N) of the two lifting ribs 7 to be water-filled. Here, the description of the "eccentric position (N)" in the present embodiment means any of the temporarily calculated temporary eccentric position (θ1, not shown) and the officially determined official eccentric position (θ2, not shown). The concept of one or both parties. The temporary eccentric position (θ1) and the formal eccentric position (θ2) are described in detail later.

The region Y in which the eccentric position (N) of the lifting rib 7 to be water-injected is specified is specifically referred to as the regions (P(A)), (P(B)), and (P(C)). Further, the region Y of the eccentric position (N) required to eliminate the eccentricity means the regions (P(AB)), (P(BC)), and (P(CA)). Further, the angle centered on the axis S1 of the regions (P(A)), (P(B)), and (P(C)) is set to 20°, and the region (P(AB)), ( The angle at which the axis S1 of P(BC)) and (P(CA)) is centered is set to 100°.

Further, in the present embodiment, the lifting rib 7 corresponding to the character not described in the ABC is the lifting rib 7 closest to the eccentric position (N).

Further, in the present embodiment, the acceleration sensor 12 is a three-axis sensor capable of detecting accelerations in the vertical direction, the horizontal direction, and the front-rear direction.

With this configuration, even if the laundry shown in FIG. 6 is in a state of being opposed to the base end side and the distal end side of the drum 2 (the state of the opposing load), the eccentric position (N) and the eccentricity can be accurately detected. Quantity (M).

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. Fig. 8 shows the pre-dehydration process in the first half of the dehydration process, and Fig. 10 and Fig. 11 show 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 a signal indicating that the dehydration process should be started during the washing mode operation, the central control unit 31 proceeds to step SP1 to start the pre-dehydration process.

In step SP1, the central control unit 31 raises the rotation of the drum 2 to a first rotation speed (N1) lower than the resonance point CP of the drum 2 after the drum 2 is loosely reversed. When the rotational speed of the drum 2 reaches the first rotational speed (N1), the process proceeds to step SP2. In the present embodiment, the first number of revolutions (N1) is set to be 180 rpm lower than about 300 rpm which is the resonance point CP of the drum 2.

In step SP2, the central control unit 31 performs control of the eccentric amount (M) and the eccentric amount/temporary eccentric position measurement on the eccentricity detecting unit based on the acceleration signal supplied from the acceleration sensor 12. At this time, the central control unit 31 calculates the eccentric amount (M) for each direction based on, for example, the acceleration signals in the up-down direction, the left-right direction, and the front-rear direction obtained from 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.

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 start determination, that is, whether or not M < ma is established. When it is determined that M < ma is satisfied, the central control unit 31 proceeds to step SP4, and when it is determined that M < ma is not satisfied, the process proceeds to step SP5. Here, the first eccentric amount threshold (ma) is a threshold value imaginary: the offset of the laundry is so large that it is difficult to reduce the eccentric amount (M) to enable the drum 2 even if the adjustment water W is supplied to the lifting rib 7 The speed of the rise rises to the extent of the dehydration steady state speed. In other words, in the case of proceeding to step SP5, 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 eccentricity threshold (ma) is further explained. In the present embodiment, the acceleration sensor 12 applies an acceleration sensor that can detect accelerations in the vertical direction, the horizontal direction, and the front-rear direction, respectively.

In step SP4, when the eccentric amount (M) calculated in step SP2 is smaller than the first eccentric amount threshold (ma) set in the eccentric position, the central control unit 31 increases the rotational speed of the drum 2. In addition, the central control unit 31 continues to perform the control of the eccentric amount/temporary eccentric position measurement of the present embodiment while increasing the number of revolutions of the drum 2. Here, "continuing" is not necessarily limited to a scheme that is continuously performed continuously. Of course, it is also possible to intermittently execute the control of the eccentric amount/temporary eccentric position measurement of the present embodiment when the number of revolutions of the drum 2 is increased to a plurality of rotation speeds until the dehydration steady-state rotation speed is reached.

In step SP5, the central control unit 31 stops the rotation of the drum 2 or lowers the number of revolutions of the drum 2 to a rotational speed greater than the centrifugal force, so that the so-called eccentric position adjustment process of the laundry in the vertical direction agitating drum 2 is performed. control. Thereafter, the process returns to step SP1. In Fig. 7, the solid line indicates the behavior of not rotating the lifting rib 7, and the rotation speed of the drum 2 reaches the rotation speed at the time of dehydration steady-state rotation. Further, in Fig. 7, the imaginary line on the upper side indicates the behavior of the rotational speed when the rotational speed reaches the dehydration steady-state rotational speed only after the water is applied to the lifting rib 7, and the rotational speed of the drum 2 in step SP5 is indicated by the lower imaginary line. behavior.

The control of the eccentric position adjustment processing will be further described with reference to FIG. 9. First, when it is judged by the above-described step SP3 that the eccentric amount (M) is so large that it is difficult to reduce, the rotation of the drum 2 is stopped (step SP51). Thereafter, the drum 2 is rotated at a rotation speed at which the centrifugal force is lowered, 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 specifically shown and illustrated in FIG. 10 in FIG.

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 set in advance by the number of rotations of the drum 2. When the eccentric amount (M) is lower than the eccentricity threshold for water injection, the central control unit 31 does not perform water injection into the lifting rib 7, and moves to step SP7. When the eccentric amount (M) is larger than the eccentricity threshold for water injection, the central control unit 31 performs water injection into the lifting rib 7 and then moves to SP7 after the water injection.

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

In step SP8, when the rotation speed of the drum 2 reaches the dehydration steady-state rotation speed, the central control unit 31 maintains the state to maintain the rotation speed of the drum 2 until the end of the dehydration process. In the present embodiment, the dehydration steady-state 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.

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

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 rotation speed does not reach 400 rpm, the central control unit 31 shifts to step SP71. When the rotation speed reaches 400 rpm, the central control unit 31 shifts to step SP73.

In step SP73, the central control unit 31 increases the rotational speed by 5 rpm per second until the rotational speed of the drum 2 reaches 600 rpm. The central control unit 31 executes step SP6 in parallel while performing step SP72.

In step SP74, the central control unit 31 determines whether or not the rotational speed of the drum 2 has reached 600 rpm. If the number of revolutions does not reach 600 rpm, the central control unit 31 shifts to step SP73. When 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 is raised to 400 to 600 rpm is lower than the other rotation regions because the amount of water dehydrated from the laundry is larger than the other rotation regions in the rotation region, so that unnecessary noise generated by the dehydrated water is generated. reduce.

In step SP72, the central control unit 31 increases the rotational speed by 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 SP72.

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 shifts to step SP75. When the number of revolutions reaches 800 rpm, the central control unit 31 shifts to step SP8.

In step SP8, when the number of rotations of the drum 2 reaches 800 rpm as the dehydration steady-state rotation speed, the central control unit 31 maintains the state to continue the dehydration process, and after confirming that the predetermined time has elapsed, the washing is ended. In other words, the central control unit 31 rotates the drum 2 at the dehydration steady-state rotational speed for a predetermined time to perform the dehydration treatment, similarly to the dehydration process in the normal washing. After that, the dehydration treatment ends. Then, the dehydration is finished, and the deceleration of the drum 2 is started. When the centrifugal force is less than the gravitational acceleration, the adjustment water W in the lifting rib 7 flows out to perform drainage.

In the control method of the present embodiment, after the step SP3 as the second eccentricity detecting step, the step SP6 as the water injection step and the step SP7 as the rotation speed increasing step are repeated until the rotation speed of the drum 2 reaches the dehydration steady-state rotation speed.

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

Fig. 12 is a flow chart showing an embodiment of the start determination. The start determination will be described below.

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

In step SP32, the central control unit 31 determines whether or not the eccentric amount Mxz is larger than the threshold M_xz which is the first eccentric amount threshold (ma). If the eccentric amount Mxz is smaller than the threshold value M_xz, the central control unit 31 shifts to step SP33. If the eccentricity amount Mxz is larger than the threshold value M_xz, the central control unit 31 determines that the eccentricity amount Mxz cannot be started, and proceeds to step SP5 to perform the eccentricity amount adjustment processing.

In step SP33, the central control unit 31 determines whether or not the eccentric amount My in the front-rear direction is larger than the threshold M_y which is the first eccentric amount threshold (ma). If the eccentric amount My is smaller than the threshold value M_y, the central control unit 31 determines that it is possible to start. In this case, the number of revolutions of the drum 2 is increased. If the eccentric amount My is larger than the threshold M_y, the central control unit 31 determines that the eccentricity amount 31 cannot be started, and proceeds to step SP5 to perform the eccentricity amount adjustment processing.

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

Here, the washing machine 1 of the present embodiment is characterized in that it has an inlet port seal PK, an outer cylinder and a washing machine body 1a as a frame for water sealing, a plurality of lifting ribs 7 as a hollow balancer, and a water injection device. For injecting water into the lifting rib 7; the proximity switch 14 serves as a hollow balancer position detecting device in the drum, and generates a signal every rotation of the drum; a single acceleration sensor 12 for detecting vibration of the outer cylinder; and a central control unit 31. The eccentric position detecting means detects the eccentric position N in the front-rear direction, the vertical direction, and the left-right direction of the drum 2, and calculates the vertical difference and the left-right direction in consideration of the phase difference caused by the difference between the eccentric positions N of the front and rear direction of the drum 2. The eccentric position N.

Hereinafter, each flowchart for calculating the eccentric position N in the vertical direction and the horizontal direction will be described. First, a flowchart of step SP601 shown in Fig. 13 will be described.

In step SP602, the central control unit 31 measures the amplitude in the front-rear direction based on the signal from the acceleration sensor 12. After the amplitude in the front-rear direction is measured, the process proceeds to step SP603.

In step SP603, the central control unit 31 measures the amplitudes in the vertical direction and the horizontal direction based on the signal from the acceleration sensor 12. After the amplitudes in the vertical direction and the horizontal direction are measured, the process proceeds to step SP604.

In step SP604, the central control unit 31 determines the actual eccentric position N in the vertical direction and the horizontal direction based on the amplitude in the front-rear direction, the vertical direction, and the amplitude in the left-right direction. At this time, in the present embodiment, the eccentric position N in the vertical direction and the horizontal direction is calculated in consideration of the phase difference caused by the difference in the eccentric position N of the drum 2 in the front-rear direction. In the present embodiment, the relationship between the difference between the eccentric position N in the front-rear direction and the eccentric position N in the vertical direction and the horizontal direction is stored in the memory 32 as a map so that the central control unit 31 can read out .

Next, in Fig. 14, as a step SP602, a scheme thereof is shown. In the step SP602, the central control unit 31 as the eccentric position detecting means uses the change value of the motor rotational speed of the motor 10 during the constant-speed rotation of the drum 2, the motor current change value, and the amplitude value from the vertical direction of the acceleration sensor 12, The amplitude of the direction is used to measure the amplitude in the front-rear direction.

In step SP602a, the central control unit 31 detects a change in the motor rotation speed. When the change is detected, the process proceeds to step SP602a.

In step SP602b, the central control unit 31 detects a difference between the change value of the motor current and the amplitude value in the vertical direction and the amplitude value in the horizontal direction. Then, based on the difference, the amplitude in the front-rear direction is determined.

FIG. 16 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. In the figure, for convenience, the temporary eccentric position θ1 is calculated based on the time difference t1 between the maximum value (Ymax) of the acceleration in the left-right direction obtained by the acceleration sensor 12 and the pulse signal ps. In addition, in the present embodiment shown in FIG. 12, as an example, a scheme in which the temporary eccentric position θ1 is calculated from the maximum value (Ymax) and the minimum value (Ymin) of the acceleration is shown as an example of the present invention. In other embodiments, the temporary eccentric position θ1 may be calculated from any one or a plurality of values of the acceleration zero point, the maximum value of the acceleration (Ymax), and the minimum value (Ymin). Further, the temporary eccentric position θ1 may be calculated as described above based on the acceleration in the vertical direction and the front-rear direction.

On the other hand, in the change value of the motor current, if it is written as a graph, it has a curve having an amplitude as shown in the graph showing the behavior of the acceleration. In addition, when the amount of eccentricity is large, the amplitude is smaller than that of the eccentricity. However, the change value of the motor current is substantially the same amplitude amount regardless of whether the eccentricity position is on the front side or the rear side.

Here, in the present embodiment, the acceleration sensor 12 is provided near the front end of the drum 2. Therefore, the amplitudes of the vertical direction and the horizontal direction detected by the acceleration sensor 12 are located in the vicinity of the acceleration sensor 12, that is, on the front side, and in the case of the rear side of the drum 2, the amplitudes in the vertical direction and the horizontal direction. Become smaller. In addition, when the eccentricity is located on the rear side of the drum 2, the amplitude in the front-rear direction tends to be larger than the case where the eccentricity is located on the front side of the drum 2. Thereby, it is possible to determine which position in the front-rear direction the eccentricity is located.

Next, in the modification of the step SP602 for measuring the amplitude in the front-rear direction, the central control unit 31 uses the amplitude value from the longitudinal direction of the acceleration sensor 12 and the amplitude value in the vertical direction/left-right direction. The difference between the amplitude values is used to measure the amplitude in the front-rear direction, that is, the eccentric position N in the front-rear direction.

In step SP602c, the central control unit 31 detects the amplitude value in the vertical direction and the amplitude value in the horizontal direction by the acceleration sensor 12. After the amplitude value in the vertical direction and the amplitude value in the horizontal direction are detected, the process proceeds to step SP602d.

In step SP602d, the central control unit 31 detects the amplitude value in the front-rear direction by the acceleration sensor 12.

In step SP602e, the central control unit 31 determines the eccentric position N in the front-rear direction based on the amplitude value from the vertical direction of the acceleration sensor 12 and the difference between the amplitude value in the left-right direction and the amplitude value in the front-rear direction during the constant-speed rotation of the drum.

17 is a vertical value and a left-right direction when the eccentricity of the drum 2 is 220 rpm and the eccentricity is located at the front (front side), the center, and the rear (rear side), and the eccentricity of the weight is shown. A graph of the difference between the amplitude value and the amplitude value in the front-rear direction. In this way, the difference between the amplitude value in the vertical direction and the amplitude value in the horizontal direction and the front-rear direction differs depending on the direction of the front-rear direction and the value of the load. In particular, when the eccentricity is located at the rear (rear side), there is a tendency that the amplitude value in the front-rear direction is larger.

In other words, by detecting the difference between the amplitude value in the vertical direction and the amplitude value in the horizontal direction and the amplitude value in the front-rear direction, the position in the front-rear direction of the eccentricity and the amount of eccentricity can be estimated.

Further, in the center control unit 31, the eccentric position detecting means in the front-rear direction of the drum 2 measures the eccentric position N in the front-rear direction in accordance with the difference in the rate of change of the phase with the increase in the number of revolutions.

FIG. 18 is a graph showing the temporary eccentric position θ1 detected based on the acceleration in the front-rear direction in the acceleration sensor 12 and the official eccentric position θ2 as the actual eccentric position. The vertical axis represents the eccentric position (angle) in the up and down direction and the left and right direction, and the horizontal axis represents the number of revolutions of the drum 2. Further, in the figure, the temporary eccentric position θ1 collectively shows the temporary eccentric position θ1 (front side) in the case where the eccentric position is located on the front side and the temporary eccentric position θ1 (rear side) in the case where the eccentric position is located on the rear side.

As shown in the figure, since the temporary eccentric position θ1 (front side) and the temporary eccentric position θ1 (rear side) exhibit different behaviors, in order to derive the formal eccentric position θ2, it is obviously necessary to perform different corrections separately, in other words, separately Calculated by different calculations.

Further, in the figure, the behavior of the temporary eccentric position θ1 (rear side) rapidly changes (rises in the graph) in the vicinity of a predetermined number of revolutions such as 350 rpm during the rotation. By detecting this behavior, it is also estimated that the eccentric position is on the back side.

As described above, in the present embodiment, it is helpful to determine a more accurate eccentric position by estimating the eccentric position in the front-rear direction by a plurality of methods.

As described above, the drum type washing machine 1 of the present embodiment includes the inlet port seal PK, the outer cylinder 3 and the washing machine body 1a as a frame for water sealing, and the proximity sensor 14 as the drum position detecting device. Each time the drum 2 rotates, a signal is generated; a single acceleration sensor 12 for detecting the vibration of the outer cylinder 3; and a central control unit 31 as an eccentric position detecting unit for detecting the front-rear direction, the up-and-down direction, and the left-right direction of the drum 2. The eccentric position N is calculated by considering the eccentric position N of the front and rear direction of the drum 2, and calculating the eccentric position N in the vertical direction and the horizontal direction.

Thereby, the plurality of acceleration sensors 12 are not used, and the eccentric position N in the vertical direction and the horizontal direction can be accurately measured regardless of the eccentric position N of the drum 2 in the front-rear direction.

In the drum type washing machine 1 of the present embodiment, the central control unit 31 as the eccentric position detecting means uses the change value of the rotational speed of the motor 10 during the constant speed rotation of the drum 2, the current change value of the motor 10, and the left and right from the acceleration sensor 12. The difference between the amplitude values was measured.

As a result, the drum type washing machine 1 of the present embodiment can measure the left and right amplitude values with higher accuracy.

In the drum type washing machine 1 of the present embodiment, the central control unit 31 as the eccentric position detecting means in the front-rear direction of the drum 2 has an amplitude value from the vertical direction of the acceleration sensor 12 and an amplitude value in the left-right direction in accordance with the constant-speed rotation of the drum 2. The difference was measured from the amplitude value in the front-rear direction.

Thereby, the drum type washing machine 1 of the present embodiment can measure the amplitude value in the front-rear direction with higher accuracy.

The drum type washing machine 1 of the present embodiment is characterized in that the central control unit 31 as the eccentric position detecting means in the front-rear direction of the drum 2 measures the difference in the phase change rate in accordance with the increase in the number of revolutions of the motor 10.

Although an embodiment of the present invention has been described above, the configuration of the present embodiment is not limited to the above, 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 type fully automatic washing machine which can be applied to a home is disclosed, and of course, it is widely applicable to a laundromat shop. The horizontal washing and drying machine can also be suitably applied to the control method of the present invention.

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

Other modifications can be made without departing from the spirit and scope of the invention.

Description of the reference signs:

1 washing machine

1a frame (washing machine body)

12 acceleration sensor

2 rollers

3 outer tube

7 lifting ribs

M eccentricity

N eccentric position

Claims

A drum type washing machine having:

frame;

An outer cylinder fixed to the frame;

Injecting an inlet seal to connect the outer cylinder and the frame for water sealing;

The drum is rotatably supported in the outer cylinder,

The drum type washing machine is characterized by having:

The drum position detecting device generates a signal every time the drum rotates;

a single acceleration sensor for detecting the vibration of the outer cylinder;

The eccentric position detecting unit detects the eccentric position of the drum in the front-rear direction, the up-and-down direction, and the left-right direction,

The drum type washing machine calculates the eccentric position in the up and down direction and the left and right direction in consideration of the eccentric position of the drum in the front-rear direction.
A drum type washing machine according to claim 1, wherein

The eccentric position detecting means measures the difference between the motor rotation speed during the constant-speed rotation of the drum, the motor current change value, and the amplitude value from the vertical direction and the left-right direction of the acceleration sensor.
A drum type washing machine according to claim 1 or 2, characterized in that

The eccentric position detecting means in the front-rear direction of the drum is measured based on the difference between the amplitude values of the vertical direction and the left-right direction from the acceleration sensor and the amplitude values of the front-rear direction in the constant-speed rotation of the drum.
A drum type washing machine according to claim 2, wherein

The eccentric position detecting means of the drum in the front-rear direction is measured in accordance with the difference in the rate of change of the phase with the increase in the number of revolutions.