KR102639687B1 - Washing machine and controlling method thereof - Google Patents

Abstract

Provide a washing machine that can properly determine whether waterproof clothing is present or not. washing machine cabinet; an outer shell elastically supported inside the cabinet; an inner tank rotatably provided inside the water tank; a motor that rotates the inner tank; A vibration sensor provided on the outer tank; A rotation sensor provided on the motor; and electrically connected to the vibration sensor, the rotation sensor, and the motor, and controlling the rotational speed of the motor based on the vibration of the outer tank detected by the vibration sensor and the rotation of the motor detected by the rotation sensor. It may include a control unit that does.

Description

Washing machine and its control method {WASHING MACHINE AND CONTROLLING METHOD THEREOF}

The disclosed invention relates to a washing machine and a control method thereof.

Fully automatic washing machines that automatically perform washing, rinsing, and spin-drying processes have been known. In such a washing machine, laundry that hardly allows water to pass through or that only allows a small amount of water to pass through, such as clothing that has been treated with a waterproofing treatment and impermeable products (e.g., raincoats, nylon bed covers, etc.) (herein collectively referred to as waterproof clothing) is usually difficult to dehydrate, and there is a risk of generating abnormal vibrations during dehydration. Therefore, such washing machines are cautioning users not to perform dehydration treatment.

Specifically, when waterproof clothing is mixed in laundry, water may be wrapped around the waterproof clothing when washing or rinsing is performed. In this state, when the dehydration treatment is started, for example, when the rotation speed of the washing and dehydration tank reaches a high rotation range such as 1000 rpm, the water remaining in the waterproof clothing suddenly moves, causing abnormal vibration, and causing the water tank to shake significantly. There is.

Therefore, even when waterproof clothing is mixed in laundry and dehydrated, technologies for predicting and preventing abnormal vibration are being investigated, and various methods are currently being proposed.

One aspect of the disclosed invention seeks to provide a washing machine and a control method for the same that can appropriately determine the presence or absence of waterproof clothing.

A washing machine according to one aspect of the disclosed invention includes a cabinet; an outer shell elastically supported inside the cabinet; an inner tank rotatably provided inside the water tank; a motor that rotates the inner tank; A vibration sensor provided on the outer tank; A rotation sensor provided on the motor; and electrically connected to the vibration sensor, the rotation sensor, and the motor, and controlling the rotational speed of the motor based on the vibration of the outer tank detected by the vibration sensor and the rotation of the motor detected by the rotation sensor. It may include a control unit that does.

The control unit receives a vibration signal indicating vibration of the outer tank from the vibration sensor, receives a rotation signal indicating rotation of the motor from the rotation sensor, and receives the vibration signal based on the phase difference between the vibration signal and the rotation signal. The rotation speed of the motor can be controlled.

The control unit rotates the motor at a first rotation speed when the change in the phase difference is less than the reference value, and when the change in the phase difference is greater or less than the reference value, the control unit rotates the motor at a second rotation speed less than the first rotation speed. It can be rotated at 2 rotation speeds.

The control unit may perform a free spin to accelerate the motor to a first dehydration speed in the dehydration process and a main spin to accelerate the motor to a second dehydration speed greater than the first rotation speed.

The control unit receives a first vibration signal from the vibration sensor in response to the rotation speed of the motor reaching the detection speed during the free spin and receives a first rotation signal from the rotation sensor, and receives the first rotation signal from the rotation sensor during the main spin. In response to the rotation speed of the motor reaching the detection speed, a second vibration signal may be received from the vibration sensor and a second rotation signal may be received from the rotation sensor.

The control unit is based on a first phase difference indicating a phase difference between the first vibration signal and the first rotation signal and a second phase difference indicating a phase difference between the second vibration signal and the second rotation signal. The rotation speed of the motor can be controlled.

The first control unit rotates the motor at a first rotation speed when the difference between the first phase difference and the second phase difference is less than a reference value, and determines the difference between the first phase difference and the second phase difference. If the difference is greater or less than the reference value, the motor may be rotated at a second rotation speed that is less than the first rotation speed.

A washing machine control method according to one aspect of the disclosed invention includes a washing machine including a cabinet, an outer tub elastically supported inside the cabinet, an inner tub rotatably provided inside the outer tub, and a motor for rotating the inner tub. Detecting vibration of the outer tank by a vibration sensor provided on the outer tank; detecting the rotation of the motor by a rotation sensor provided on the motor; It may include controlling the rotational speed of the motor based on the vibration of the outer tank and the rotation of the motor.

Controlling the rotation speed of the motor based on the vibration of the outer tank and the rotation of the motor is based on the phase difference between the vibration signal representing the vibration of the outer tank and the rotation signal representing the rotation of the motor. This may include controlling speed.

Controlling the rotational speed of the motor based on the phase difference includes rotating the motor at a first rotational speed when the change in the phase difference is less than a reference value; If the change in the phase difference is greater or less than the reference value, the method may include rotating the motor at a second rotation speed that is less than the first rotation speed.

The control method may further include performing a free spin for accelerating the motor to a first dehydration speed and a main spin for accelerating the motor to a second dehydration speed greater than the first rotation speed in the dehydration stroke.

The control method includes, in response to the rotational speed of the motor reaching the detection speed during the free spin, obtaining a first vibration signal indicating vibration of the outer tank and a first rotation signal indicating rotation of the motor; In response to the rotation speed of the motor reaching the detection speed during the main spin, it may include obtaining a second vibration signal indicating vibration of the outer tank and a second rotation signal indicating rotation of the motor.

Controlling the rotation speed of the motor based on the vibration of the outer tank and the rotation of the motor includes a first phase difference indicating a phase difference between the first vibration signal and the first rotation signal, and the second vibration signal It may include controlling the rotation speed of the motor based on a second phase difference indicating a phase difference between the second rotation signals.

Controlling the rotational speed of the motor based on the first phase difference and the second phase includes rotating the motor to the first rotation when the difference between the first phase difference and the second phase difference is less than a reference value. rotate at speed; If the difference between the first phase difference and the second phase difference is greater than or less than the reference value, the method may include rotating the motor at a second rotation speed that is less than the first rotation speed.

A washing machine according to one aspect of the disclosed invention includes a rotary tub in which laundry is accommodated, a water tank with the rotary tub inside, and a drive motor that rotationally drives the rotary tub, and performs dehydration treatment of the laundry by rotating the rotary tub. can do. The washing machine includes a vibration sensor that detects horizontal acceleration accompanying vibration of the water tank, a motor sensor that detects a rotation signal of the drive motor, and a rotation control unit that controls the rotation operation of the drive motor, The rotation control unit controls the operation of the drive motor to perform two acceleration strokes that accelerate the rotation of the rotating tub in a low rotation region lower than a predetermined rotation speed at the start of the dehydration treatment, and the vibration sensor And the motor sensor may detect the acceleration and the rotation signal in each of the two acceleration strokes.

The vibration sensor and the motor sensor may detect the acceleration and the rotation signal at the same predetermined rotation speed of the two acceleration strokes.

Based on the detection value of the vibration sensor and the detection value of the motor sensor, the washing machine may further include a waterproof clothing determination unit that determines the presence or absence of waterproof clothing in the laundry.

The waterproof clothing determination unit may calculate a phase difference between the phase of the acceleration detected by the vibration sensor and the phase of the rotation signal detected by the motor sensor.

The waterproof clothing determination unit may determine the presence or absence of the waterproof clothing by comparing the amount of change in the two phase differences calculated for each acceleration stroke with a predetermined reference value.

When it is determined by the waterproof clothing determination unit that there is waterproof clothing, the rotation control unit may control the operation of the drive motor to rotate the rotating tub at a predetermined rotation speed or less during the dehydration process.

According to one aspect of the disclosed invention, a washing machine and a control method thereof that appropriately determine the presence or absence of waterproof clothing can be provided.

1 is a schematic longitudinal cross-sectional view showing the configuration of a washing machine according to an embodiment.
Figure 2 is a block diagram showing a control device included in a washing machine according to an embodiment and the relationship between each device.
Figure 3 is a flowchart showing judgment processing by a waterproof clothing determination unit included in a washing machine according to an embodiment.
Figure 4 is a diagram for explaining two acceleration strokes at the start of dehydration treatment according to one embodiment.
Figure 5 is a diagram for explaining the unbalanced position of laundry in each of the free spin and main spin when there are only regular clothes in the washing machine according to one embodiment.
FIG. 6 is a diagram illustrating the phase difference between the horizontal acceleration of the vibration sensor and the rotation signal of the motor sensor during free spin when there are only general clothes in the washing machine according to an embodiment.
FIG. 7 is a diagram illustrating the phase difference between the horizontal acceleration of the vibration sensor and the rotation signal of the motor sensor during the main spin when there are only general clothes in the washing machine according to one embodiment.
Figure 8 is a diagram for explaining the unbalanced position of the laundry in each of the free spin and main spin when waterproof clothing is mixed in the washing machine according to one embodiment.
FIG. 9 is a diagram illustrating the phase difference between the horizontal acceleration of the vibration sensor and the rotation signal of the motor sensor during free spin when waterproof clothing is mixed in the washing machine according to one embodiment.
FIG. 10 is a diagram illustrating the phase difference between the horizontal acceleration of the vibration sensor and the rotation signal of the motor sensor during the main spin when waterproof clothing is mixed into the washing machine according to one embodiment.

Like reference numerals refer to like elements throughout the specification. This specification does not describe all elements of the embodiments, and general content or overlapping content between the embodiments in the technical field to which the present invention pertains is omitted. The term 'unit, module, member, block' used in the specification may be implemented as software or hardware, and depending on the embodiment, a plurality of 'unit, module, member, block' may be implemented as a single component, or It is also possible for one 'part, module, member, or block' to include multiple components.

Throughout the specification, when a part is said to be “connected” to another part, this includes not only direct connection but also indirect connection, and indirect connection includes connection through a wireless communication network. do.

Additionally, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

Throughout the specification, when a member is said to be located “on” another member, this includes not only cases where a member is in contact with another member, but also cases where another member exists between the two members.

Terms such as first and second are used to distinguish one component from another component, and the components are not limited by the above-mentioned terms.

Singular expressions include plural expressions unless the context clearly makes an exception.

The identification code for each step is used for convenience of explanation. The identification code does not explain the order of each step, and each step may be performed differently from the specified order unless a specific order is clearly stated in the context. there is.

Hereinafter, the operating principle and embodiments of the present invention will be described with reference to the attached drawings.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention will be described based on the drawings. In addition, the description of the preferred embodiments below is essentially merely illustrative and is not intended to limit the present invention, its applications, or its uses.

<Configuration of the washing machine>

1 is a schematic longitudinal cross-sectional view showing the configuration of a washing machine according to an embodiment. Figure 2 is a block diagram showing a control device included in a washing machine according to an embodiment and the relationship between each device.

As shown in FIG. 1, the washing machine 1 is a so-called top load washing machine, and an inlet 2a is installed at the upper part of a rectangular box-shaped housing 2. Laundry C is loaded in and out through this input port 2a.

An operation unit 3 is installed behind the inlet 2a, and when the user operates the operation unit 3, the washing machine 1 performs the following processes: “water supply,” “wash,” “rinse,” and “spin.” , can be carried out continuously and automatically.

Inside the housing 2, a water tank 10, a rotating tank 20, a drive motor 30, a pulsator 40, a balancer 50, a control device 60, etc. are installed.

The water tank 10 is comprised of a cylindrical container with a bottom that opens upward, and is provided in the central portion of the housing 2. The water tank 10 is elastically supported by the housing 2 in a suspended state by a plurality of suspensions 11 so that it can swing and move within the housing 2.

The rotating tank 20 is smaller than the water tank 10 and is comprised of a cylindrical container with a bottom that opens upward. The rotating tank 20 is accommodated inside the water tank 10 with its center aligned with the longitudinal axis J.

In the peripheral wall portion 20a of the rotating tank 20, a plurality of drain holes 21 penetrating inside and outside are formed along the entire circumference. A pulsator 40 is provided at the bottom of the rotating tank 20. The pulsator 40 is made of a disk-shaped member having a plurality of blade-shaped protrusions provided radially on the upper surface. Laundry C is put into the rotary tub 20, and all processes such as washing and spin-drying are performed with the laundry C accommodated in the rotary tub 20.

The rotary tank 20 is rotatably supported in the water tank 10 and is driven to rotate around the vertical axis J by a drive motor 30 installed on the back side of the bottom of the water tank 10. Specifically, the drive motor 30 includes a motor body 31 and a power transmission device 32. The power transmission device 32 has a first rotation axis 32a and a second rotation axis 32b, each center of which coincides with the longitudinal axis J.

The first rotating shaft 32a penetrates the bottom wall of the water tank 10 and is mounted on the bottom wall of the rotating tank 20. The second rotating shaft 32b penetrates the bottom wall of the water tank 10 and the bottom wall of the rotating tank 20 and protrudes into the inside of the rotating tank 20, and its protruding end is mounted at the center of the pulsator 40. there is.

The power transmission device 32 switches the respective rotation directions of the first rotation shaft 32a and the second rotation shaft 32b according to each process. Therefore, the first rotation shaft 32a and the second rotation shaft 32b are capable of forward or reverse rotation or forward/reverse rotation in a state independent of or integrated with each other. For example, in washing processing or rinsing processing, only the second rotation shaft 32b is driven, so that the rotating tub 20 does not rotate and the pulsator 40 rotates forward/reverse at a constant cycle. In the dehydration process, the first rotation shaft 32a and the second rotation shaft 32b are driven integrally, and the rotating tub 20 and the pulsator 40 rotate integrally in a constant direction at high speed.

The balancer 50 is an annular member and is installed at the upper end of the peripheral wall portion 20a of the rotating tank 20. Inside the balancer 50, a high specific gravity liquid such as salt water, a plurality of balls, etc. are movably enclosed. By the balancer 50, when the rotary tub 20 rotates at high speed, the imbalance caused by the uneven distribution of the laundry C is canceled out, and thus vibration during dehydration treatment can be suppressed.

A drain hose 12 and a drain pump 13 are installed inside the housing 2 below the water tank 10. One end of the drain hose 12 is connected to the bottom wall of the water tank 10, and the other end of the drain hose 12 is connected to the suction port of the drain pump 13. A washing machine external hose 14 extending outside the housing 2 is connected to the discharge port of the drain pump 13.

A water supply device 70 is installed above the inside of the housing 2 to supply water to the water tank 10 before washing or rinsing. The water supply device 70 is configured to allow water to flow into the inside of the water tank 10 through the opening of the rotating tank 20 at a constant flow rate.

A small box-shaped air chamber 15 is integrally installed below the outer surface of the peripheral wall of the water tank 10. The air chamber 15 is in communication with the inside of the water tank 10 through a communication hole 16 opened in a lower corner of the water tank 10. The lower end of the sub hose 17 extending in the vertical direction along the surrounding wall of the water tank 10 is connected to the upper part of the air chamber 15. A water level sensor 18 is connected to the upper end of the sub hose 17. The water level sensor 18 and the air chamber 15 are connected via a sub hose 17.

Accordingly, when water is supplied into the water tank 10 from the water supply device 70, part of the water also flows into the air chamber 15 through the communication hole 16. When the water level in the water tank 10 rises or falls, the water pressure of the water stored in the water tank 10 also changes, so the air pressure in the air chamber 15 also rises or falls in conjunction with it. The water level sensor 18 outputs an oscillation frequency according to this change in atmospheric pressure to the control device 60, and the control device 60 detects the water level of the water tank 10 from the oscillation frequency.

A vibration sensor 19 is installed on the back side of the bottom wall of the water tank 10. The vibration sensor 19 detects the horizontal acceleration accompanying the vibration of the water tank 10.

The control device 60 is installed inside the housing 2 above. The control device 60 includes hardware such as a CPU and memory, and software such as a control program, and can comprehensively control the operation of the washing machine.

That is, the control device 60 controls the rotation speed of the drive motor 30 or the rotation direction of the power transmission device 32 according to the control program, and performs water supply, washing, intermediate spin-drying, rinsing, draining, and spin-drying operations. Executes each process.

As shown in FIG. 2, a water level sensor 18, a vibration sensor 19, and a motor sensor 33 are connected to the control device 60 as input devices. The motor sensor 33 is comprised of, for example, a Hall sensor, and outputs a rotation signal for each rotation of the drive motor 30 at an arbitrary position in the circumferential direction of the drive motor 30 . The control device 60 can acquire the rotational position or rotation period of the drive motor 30 based on the detection value of the motor sensor 33.

An input unit 3 is connected to the control device 60 as an input/output device. An input switch 4 is installed in the input unit 3. Additionally, as output devices, a notification buzzer 6, a drive motor 30, a drain pump 13, and a water supply device 70 are connected to the control device 60.

Additionally, the control device 60 is provided with a rotation control unit 61, a water/drain control unit 62, and a waterproof clothing determination unit 64.

The rotation control unit 61 can control the rotation of the rotary tub 20 or the pulsator 40 by controlling the driving of the drive motor 30. The water supply/drainage control unit 62 can control drainage or water supply by controlling the operation of the drain pump 13 and the water supply device 70.

The waterproof clothing determination unit 64 can determine the presence or absence of waterproof clothing (Cwp) in order to prevent abnormal vibration during dehydration treatment.

<Each processing in the washing machine>

With laundry C placed in the rotary tub 20, the user operates the input switch 4 and selects a predetermined operation mode, thereby starting a series of processes such as washing, rinsing, and spin-drying.

(wash, rinse)

In a state where the drain pump 13 is stopped, water is supplied from the water supply device 70 to the rotating tank 20, and a predetermined amount of water according to the laundry C is supplied to the water tank 10 and the rotating tank 20. This can be saved. In the laundry process, detergents may also be added to the water. In that state, the rotary tub 20 does not rotate, and the pulsator 40 rotates forward/reverse, so that the laundry C can be agitated with water.

(Intermediate dehydration treatment, dehydration treatment)

After the rinsing process is completed, the drain pump 13 operates so that water can be drained from the water tank 10. Additionally, the rotation control unit 61 allows the rotation tub 20 to be integrated with the pulsator 40 and rotate in a certain direction. The rotation of the rotating tub 20 increases until it reaches the highest high-speed rotational speed (dehydration rotational speed) exceeding 1000 rpm, and then the rotating tub 20 can rotate at the dehydration rotational speed for a certain period of time.

As a result, the water contained in the laundry C can be discharged from the rotary tub 20 through the drain hole 21 by the action of centrifugal force. Water discharged from the rotary tub 20 may be drained to the outside of the washing machine through the drain hose 12 and the washing machine external hose 14.

Dehydration treatment may be performed at the end of a series of treatments. In addition, when washing or rinsing treatment is repeated in the middle of a series of treatments depending on the operation mode, intermediate dehydration treatment may be performed between each rinsing treatment and washing treatment (here, intermediate dehydration treatment and dehydration treatment are comprehensively referred to as (Also called dehydration treatment).

<Abnormal vibration during dehydration>

When the laundry C contains only water-permeable general laundry such as underwear, shirts, sweaters, etc. (herein also referred to as general clothing Cn), these general clothing Cn and the drain hole 21 are passed through the rotary tank. The water stored in (20) can be discharged to the outside without hindrance. Therefore, during the dehydration treatment, the laundry C in the rotary tub 20 is dehydrated and its weight decreases, so even if the laundry C is greatly skewed, the balancer 50 can follow the change in unbalance, thereby Abnormal vibrations rarely occur.

However, laundry that barely allows water to pass through, or only allows a small amount of water to pass through, such as clothing that has been treated to be waterproof and impermeable products (e.g. raincoats, nylon bed covers, etc.) If waterproof clothing (Cwp) (generally referred to as waterproof clothing (Cwp)) is mixed with the laundry (C), drainage is obstructed by the waterproof clothing (Cwp), and as a result, drainage is difficult to remain inside the rotary tub (20). numbers can be formed.

Specifically, if waterproof clothing (Cwp) is mixed in the laundry (C), a state in which water is surrounded by the waterproof clothing (Cwp) (a state of catching water) may occur before dehydration treatment. The trapped state is not necessarily limited to a state in which water is completely surrounded, but includes a state in which water is not released by the centrifugal force that acts during dehydration treatment. Typically, if you have waterproof clothing (CWP), catch conditions, big or small, will occur. If the remaining water is small, it is not a problem, but if the residual water is large, it becomes a problem.

When the rotation speed of the rotating tank 20 is increased in order to perform dehydration treatment in the rotating tank 20 in which such a trapping state has occurred, the waterproof clothing (Cwp) or general clothing (Cn) in the catching state is caused by centrifugal force. It is pushed into the peripheral wall portion 20a of the rotating tank 20. As a result, the general clothing Cn is dehydrated, its weight gradually decreases, and it sticks to the peripheral wall portion 20a without moving. On the other hand, the weight of the waterproof clothing (Cwp) hardly changes, and the water inside moves upward and sticks to the surrounding wall portion 20a due to the action of centrifugal force caused by an increase in the number of rotations.

Accordingly, inside the rotating tank 20, the unbalanced position of the waterproof clothing (Cwp) and the unbalanced position of the normal clothing (Cn) are opposed to each other. Additionally, as the water inside the waterproof clothing (Cwp) moves up and down, the rotating tank 20 or the water tank 10 is shaken and moved greatly in three dimensions, resulting in abnormal vibration.

In order to prevent abnormal vibration caused by such waterproof clothing (Cwp), the washing machine 1 can determine the presence or absence of waterproof clothing (Cwp). Then, based on the determination result, the washing machine 1 can set the spin-drying rotation speed.

Hereinafter, the judgment processing by the waterproof clothing judgment unit 64 will be described in detail with reference to the flowchart shown in FIG. 3.

(Determination of presence or absence of waterproof clothing)

Figure 3 is a flowchart showing judgment processing by a waterproof clothing determination unit included in a washing machine according to an embodiment. Figure 4 is a diagram for explaining two acceleration strokes at the start of dehydration treatment according to one embodiment. Figure 5 is a diagram for explaining the unbalanced position of laundry in each of the free spin and main spin when there are only regular clothes in the washing machine according to one embodiment. FIG. 6 is a diagram illustrating the phase difference between the horizontal acceleration of the vibration sensor and the rotation signal of the motor sensor during free spin when there are only general clothes in the washing machine according to an embodiment. FIG. 7 is a diagram illustrating the phase difference between the horizontal acceleration of the vibration sensor and the rotation signal of the motor sensor during the main spin when there are only general clothes in the washing machine according to one embodiment. Figure 8 is a diagram for explaining the unbalanced position of the laundry in each of the free spin and main spin when waterproof clothing is mixed in the washing machine according to one embodiment. FIG. 9 is a diagram illustrating the phase difference between the horizontal acceleration of the vibration sensor and the rotation signal of the motor sensor during free spin when waterproof clothing is mixed in the washing machine according to one embodiment. FIG. 10 is a diagram illustrating the phase difference between the horizontal acceleration of the vibration sensor and the rotation signal of the motor sensor during the main spin when waterproof clothing is mixed into the washing machine according to one embodiment.

At the start of the dehydration process, the washing machine 1 performs an acceleration operation to accelerate the rotation of the rotary tub 20 in a low rotation region (for example, 500 rpm or less) where abnormal vibration does not occur even if waterproof clothing (Cwp) is mixed. By performing the stroke twice and judging the change in the unbalanced position of the laundry C in these two acceleration strokes, the presence or absence of waterproof clothing Cwp can be determined.

As shown in FIG. 4, the rotation control unit 61 performs a predetermined rotation control (main spin) of the rotating tank 20 in a normal dewatering process that starts up to the dewatering rotation speed at the start of the dewatering process. Rotation control (free spin) is performed to accelerate to a low rotation speed.

And, in each acceleration stroke of these main spin and free spin, acceleration in the horizontal direction is detected by the vibration sensor 19 in the same rotation speed zone (hatched portion in FIG. 4) with the same acceleration state, and the motor sensor ( The rotation signal of the driving motor 30 is detected by 33). In this way, by setting the detection section before secondary resonance occurs in the washing machine 1, application is possible regardless of the type of balancer 50 (fluid balancer or ball balancer).

As shown in Figure 5, when the laundry C contains only regular clothing Cn, in the second acceleration stroke (main spin) compared to the first acceleration stroke (free spin), the normal clothing Cn The weight is reduced by the amount of water contained in it, so the change in the amount of unbalance is small and the change in the unbalance position is also small.

Figure 6 shows an example of the horizontal acceleration detected by the vibration sensor 19 and the rotation signal detected by the motor sensor during free spin in the case where only general clothing Cn is present. During free spin, horizontal acceleration is detected by the vibration sensor 19 and a rotation signal is detected by the motor sensor 33 (step S101).

As shown in FIG. 6, the horizontal acceleration has periodic positive (+) and negative (-) values. In FIG. 6, the stopping position of the water tank 10 is set to "0" and one side in the horizontal direction The vibration to the other side is graphed as acceleration in the positive direction (+), and the vibration to the other side is represented as acceleration in the negative direction (-). Additionally, the rotation signal of the motor sensor 33 is periodically output for each rotation of the drive motor 30.

The waterproof clothing determination unit 64 is a parameter that indicates how the position of the imbalance caused by the bias of the laundry C has changed, and determines the phase of the horizontal acceleration detected by the vibration sensor 19 and the motor sensor 33. The phase difference (Δ1) between the phases of the detected rotation signals is calculated (step S102). In the example shown in FIG. 6, the phase difference between the negative direction amplitude peak position of the horizontal acceleration and the output position of the rotation signal is calculated.

Next, as shown in FIG. 7, during the main spin, horizontal acceleration is detected by the vibration sensor 19, and a rotation signal is detected by the motor sensor 33 (step S103). Then, the waterproof clothing determination unit 64 calculates the phase difference Δ2 between the phase of the horizontal acceleration detected by the vibration sensor 19 and the phase of the rotation signal detected by the motor sensor 33 (step S104) .

The waterproof clothing determination unit 64 calculates the amount of change ΔS (= Δ2 - Δ1) of the two phase differences calculated for each of the two acceleration strokes (step S105). In the waterproof clothing determination unit 64, a reference value that enables judgment of the presence or absence of waterproof clothing Cwp is set in advance by comparison with the change amount ΔS of the phase difference. This reference value is obtained through experiments, etc., and can be appropriately changed depending on the model, size, operation mode, etc. of the washing machine.

The waterproof clothing determination unit 64 determines whether the amount of change ΔS in the two phase differences is greater than the reference value (step S106).

As described above, when the laundry C contains only general clothes Cn, all the laundry C contained in the rotary tub 20 is equally dehydrated. In other words, the unbalanced position of the laundry C in the first acceleration stroke (free spin) and the unbalanced position of the laundry C in the second acceleration stroke (main spin) do not change significantly. .

Therefore, the phase difference (△1) between the phase of the horizontal acceleration and the phase of the rotation signal during the free spin and the phase difference (△2) between the phase of the horizontal acceleration and the phase of the rotation signal during the main spin hardly change. It may not be possible. That is, the amount of change (ΔS) between the two phase differences is a value close to zero.

Therefore, the waterproof clothing determination unit 64 determines that the amount of change in phase difference ΔS is smaller than the reference value, that is, that the waterproof clothing Cwp is not mixed (step S107). Then, when it is determined by the waterproof clothing determination unit 64 that the waterproof clothing (Cwp) is not mixed, the rotation control unit 61 adjusts the spin-drying rotation speed of the rotating tub 20 in the main spin to the normal spin speed. The operation of the drive motor 30 is controlled to maintain the rotation speed (for example, 1000 rpm) (step S108).

Next, as shown in FIG. 8, when waterproof clothing (Cwp) is mixed into the laundry (C), in the first acceleration stroke (free spin), the general clothing ( Because Cn) contains enough water, the general clothing (Cn) side becomes heavy. In the second acceleration stroke (main spin), the regular clothing (Cn) is dehydrated and becomes lighter, the waterproof clothing (Cwp) is not dehydrated, and the water remains stored in the waterproof clothing (Cwp). That is, the unbalanced position of the laundry C in the free spin and the unbalanced position of the laundry C in the main spin change significantly.

FIG. 9 shows an example of the horizontal acceleration detected by the vibration sensor 19 and the rotation signal detected by the motor sensor during free spin in the case where waterproof clothing Cwp is mixed. During free spin, horizontal acceleration is detected by the vibration sensor 19 and a rotation signal is detected by the motor sensor 33 (step S101).

As shown in FIG. 9, during free spin, the waterproof clothing determination unit 64 determines the difference between the phase of the horizontal acceleration detected by the vibration sensor 19 and the phase of the rotation signal detected by the motor sensor 33. The phase difference (Δ1) is calculated (step S102). In the example shown in Fig. 9, the phase difference between the negative direction amplitude peak position of the horizontal acceleration and the output position of the rotation signal is calculated.

Next, as shown in FIG. 10, during the main spin, horizontal acceleration is detected by the vibration sensor 19, and a rotation signal is detected by the motor sensor 33 (step S103). The waterproof clothing determination unit 64 calculates a phase difference Δ2 between the phase of the horizontal acceleration detected by the vibration sensor 19 and the phase of the rotation signal detected by the motor sensor 33 (step S104).

The waterproof clothing determination unit 64 calculates the amount of change ΔS (= Δ2 - Δ1) of the two phase differences calculated for each of the two acceleration strokes (step S105). The waterproof clothing determination unit 64 determines whether the amount of change ΔS in the two phase differences is greater than the reference value (step S106).

As described above, when waterproof clothing (Cwp) is mixed in the laundry (C), the unbalanced position of the laundry (C) in the free spin is located on the side of the normal clothing (Cn), but in the main spin, The unbalanced position of the laundry C is located on the waterproof clothing Cwp side.

As a result, the phase difference (△1) between the phase of the horizontal acceleration and the phase of the rotation signal during the free spin and the phase difference (△2) between the phase of the horizontal acceleration and the phase of the rotation signal during the main spin change significantly. do.

Therefore, the waterproof clothing determination unit 64 determines that the amount of change in phase difference ΔS is greater than the reference value, that is, that the waterproof clothing Cwp is mixed (step S109). Then, when it is determined by the waterproof clothing determination unit 64 that waterproof clothing (Cwp) is mixed, the rotation control unit 61 adjusts the spin-drying rotation speed of the rotating tub 20 in the main spin to a predetermined low speed. The operation of the drive motor 30 is controlled to rotate at (for example, 300 rpm) (step S110).

By doing so, the washing machine 1 can complete the dehydration process without stopping the operation while suppressing abnormal vibration during the dehydration process that may occur due to the waterproof clothing Cwp.

Additionally, if it is determined that waterproof clothing (Cwp) is mixed, the washing machine 1 issues an alarm with the notification buzzer 6 or displays an error message on the display panel of the operation unit 3 to warn the user. can be ventilated.

Additionally, if it is determined that waterproof clothing (Cwp) is mixed, the washing machine 1 may stop operation at that stage and prompt the user to check and try again.

《Other embodiments》

Regarding the above embodiment, the configuration may be as follows.

The washing machine 1 can determine the presence or absence of waterproof clothing (Cwp) by performing two acceleration strokes and comparing the amount of change in the two phase differences with a predetermined reference value. In addition, the washing machine 1 can, for example, perform acceleration strokes multiple times, so that the amount of change between the phase differences at the first time and the phase difference after the second time can be acquired multiple times.

As explained above, the washing machine 1 is extremely useful and has high industrial applicability in that it achieves a highly practical effect of being able to appropriately determine the presence or absence of waterproof clothing.

As described above, the washing machine includes a rotating tub in which laundry is accommodated, a water tank inside which the rotating tub is provided, and a drive motor that rotates the rotating tub, and performs dehydration treatment of the laundry by rotating the rotating tub. You can.

The washing machine includes a vibration sensor that detects horizontal acceleration accompanying vibration of the water tank, a motor sensor that detects a rotation signal of the drive motor, and a rotation control unit that controls the rotation operation of the drive motor, The rotation control unit controls the operation of the drive motor to perform two acceleration strokes that accelerate the rotation of the rotating tub in a low rotation region lower than a predetermined rotation speed at the start of the dehydration treatment, and the vibration sensor And the motor sensor may detect the acceleration and the rotation signal in each of the two acceleration strokes.

At the start of dehydration treatment, the washing machine may perform two acceleration strokes to accelerate the rotation of the rotary tub, for example, in a low rotation region where abnormal vibration does not occur even if waterproof clothing is mixed. And, in each of these two acceleration strokes, the washing machine can detect acceleration using a vibration sensor and a rotation signal using a motor sensor.

By determining the change in the unbalanced position of the laundry in two acceleration strokes when waterproof clothing is mixed in the laundry and when it is not, the washing machine can determine the presence or absence of waterproof clothing with high precision. Therefore, as parameters for determining changes in the unbalanced position, the washing machine detects acceleration using a vibration sensor and a rotation signal using a motor sensor.

The vibration sensor and the motor sensor may detect the acceleration and the rotation signal at the same predetermined rotation speed of the two acceleration strokes.

The washing machine can detect acceleration using a vibration sensor and a rotation signal using a motor sensor at the same predetermined number of revolutions during two acceleration strokes. In this way, by determining the change in the unbalanced position of the laundry at the same rotation speed in two acceleration strokes, the washing machine can determine the presence or absence of waterproof clothing with high accuracy.

Based on the detection value of the vibration sensor and the detection value of the motor sensor, the washing machine may further include a waterproof clothing determination unit that determines the presence or absence of waterproof clothing in the laundry.

The washing machine can determine the presence or absence of waterproof clothing based on the detection value of the vibration sensor and the detection value of the motor sensor. As a result, the washing machine can prevent abnormal vibration during dehydration treatment caused by waterproof clothing.

The waterproof clothing determination unit may calculate a phase difference between the phase of the acceleration detected by the vibration sensor and the phase of the rotation signal detected by the motor sensor.

The washing machine can calculate the phase difference between the phase of the acceleration detected by the vibration sensor and the phase of the rotation signal detected by the motor sensor. As a result, the washing machine can determine how the position of the imbalance caused by the unevenness of the laundry changed during the two acceleration strokes.

The waterproof clothing determination unit may determine the presence or absence of the waterproof clothing by comparing the amount of change in the two phase differences calculated for each acceleration stroke with a predetermined reference value.

The washing machine can determine the presence or absence of waterproof clothing by comparing the amount of change in two phase differences calculated for each two acceleration strokes with a predetermined reference value.

Specifically, when waterproof clothing is not mixed in the laundry, all laundry stored in the rotary tub is dehydrated evenly. That is, the unbalanced position and amount of laundry in the first acceleration stroke and the unbalanced position and amount of laundry in the second acceleration stroke do not change significantly. As a result, the amount of change in the two phase differences calculated for each acceleration stroke is , does not exceed predetermined standard values.

In addition, when the amount of unbalance is small in the first acceleration stroke, in the second acceleration stroke, even if the change in the position and amount of the unbalance is small, the amount of change in the phase difference may be large, but the amount and position of the unbalance change significantly at the same time. There is no case for doing so. Therefore, the acceleration is greater than the predetermined reference value, and at the same time, the amount of change in phase difference does not exceed the predetermined reference value.

On the other hand, when waterproof clothing is mixed in the laundry, in the first acceleration stroke, the normal clothing contained in the rotary tub contains enough water, so the normal clothing becomes heavy, but in the second acceleration stroke, the normal clothing becomes heavy. Clothing becomes lighter by dehydrating, and water can be stored in waterproof clothing without dehydrating. That is, the unbalanced position and amount of laundry in the first acceleration stroke and the unbalanced position and amount of laundry in the second acceleration stroke may change significantly. As a result, the amount of change in the two phase differences calculated for each acceleration stroke exceeds a predetermined reference value, and the acceleration also becomes large.

In this way, the waterproof clothing determination unit can determine the presence or absence of waterproof clothing with high precision by comparing the amount of change in the two phase differences calculated for each acceleration stroke with a predetermined reference value.

When it is determined by the waterproof clothing determination unit that there is waterproof clothing, the rotation control unit may control the operation of the drive motor to rotate the rotating tub at a predetermined rotation speed or less during the dehydration process.

When the washing machine determines that waterproof clothing is included in the laundry, the washing machine rotates the rotary tub at a predetermined number of revolutions or less during the dehydration process. Specifically, when the maximum rotation speed of the rotating tub is set to about 1000 rpm in normal dehydration processing, when it is determined that waterproof clothing is contained in the rotating tub, the highest rotational speed of the rotating tub in the dehydration processing may be set to about 300 rpm, for example.

As a result, the washing machine can prevent the occurrence of abnormal vibration during dehydration processing due to water storage in waterproof clothing, and can complete the dehydration processing without stopping the operation of the washing machine.

Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium that stores instructions executable by a computer. Instructions may be stored in the form of program code, and when executed by a processor, may create program modules to perform operations of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

Computer-readable recording media include all types of recording media storing instructions that can be decoded by a computer. For example, there may be Read Only Memory (ROM), Random Access Memory (RAM), magnetic tape, magnetic disk, flash memory, optical data storage device, etc.

As described above, the disclosed embodiments have been described with reference to the attached drawings. A person skilled in the art to which the disclosed embodiments belong will understand that the disclosed embodiments may be implemented in forms different from the disclosed embodiments without changing the technical idea or essential features of the disclosed embodiments. The disclosed embodiments are illustrative and should not be construed as limiting.

1: washing machine 10: water tank
19: Vibration sensor 20: Rotating tank
30: Drive motor 33: Motor sensor
61: Rotation control unit 64: Waterproof clothing determination unit
C: Laundry Cwp: Waterproof clothing

Claims (20)

cabinet;
an outer shell elastically supported inside the cabinet;
an inner tank rotatably provided inside the outer tank;
a motor that rotates the inner tank;
A vibration sensor provided on the outer tank;
A rotation sensor provided on the motor; and
Electrically connected to the vibration sensor, the rotation sensor, and the motor, and controlling the rotation speed of the motor based on the vibration of the outer tank detected by the vibration sensor and the rotation of the motor detected by the rotation sensor. Includes a control unit,
The control unit
Receiving a vibration signal indicating vibration of the outer tank from the vibration sensor,
Receiving a rotation signal indicating rotation of the motor from the rotation sensor,
Calculate a first phase difference and a second phase difference between the vibration signal and the rotation signal,
A washing machine that controls the rotational speed of the motor based on the amount of change between the first phase difference and the second phase difference.
delete According to paragraph 1,
The control unit rotates the motor at a first rotation speed when the amount of change is less than the reference value, and rotates the motor at a second rotation speed less than the first rotation speed when the amount of change is greater than the reference value. According to paragraph 1,
The control unit is a washing machine that performs a free spin for accelerating the motor to a first spin-drying speed and a main spin for accelerating the motor to a second spin-drying speed greater than the first rotation speed in the spin-drying cycle. According to paragraph 4,
The control unit receives a first vibration signal from the vibration sensor in response to the rotation speed of the motor reaching the detection speed during the free spin and receives a first rotation signal from the rotation sensor, and receives the first rotation signal from the rotation sensor during the main spin. A washing machine that receives a second vibration signal from the vibration sensor in response to the rotation speed of the motor reaching the detection speed and receives a second rotation signal from the rotation sensor. According to clause 5,
The control unit is based on the first phase difference indicating the phase difference between the first vibration signal and the first rotation signal and the second phase difference indicating the phase difference between the second vibration signal and the second rotation signal. A washing machine that controls the rotation speed of the motor. According to clause 6,
The control unit rotates the motor at a first rotation speed when the amount of change between the first phase difference and the second phase difference is less than a reference value,
A washing machine that rotates the motor at a second rotation speed less than the first rotation speed when the amount of change between the first phase difference and the second phase difference is greater than the reference value. A method of controlling a washing machine comprising a cabinet, an outer tub elastically supported inside the cabinet, an inner tub rotatably provided inside the outer tub, and a motor for rotating the inner tub,
detecting vibration of the outer tank by a vibration sensor provided on the outer tank;
detecting the rotation of the motor by a rotation sensor provided on the motor;
Including controlling the rotational speed of the motor based on the vibration of the outer tank and the rotation of the motor,
Controlling the rotation speed of the motor,
Receiving a vibration signal indicating vibration of the outer tank from the vibration sensor;
Receive a rotation signal indicating rotation of the motor from the rotation sensor;
calculate a first phase difference and a second phase difference between the vibration signal and the rotation signal;
Controlling the rotational speed of the motor based on the amount of change between the first phase difference and the second phase difference.
delete The method of claim 8, wherein controlling the rotation speed of the motor includes:
rotating the motor at a first rotation speed if the change amount is smaller than the reference value;
A washing machine control method comprising rotating the motor at a second rotation speed that is smaller than the first rotation speed when the amount of change is greater than the reference value. The method of claim 8, wherein the control method is:
A method of controlling a washing machine further comprising performing a free spin for accelerating the motor to a first spin-drying speed and a main spin for accelerating the motor to a second spin-drying speed greater than the first rotation speed in the spin-drying cycle. ◈Claim 12 was abandoned upon payment of the setup registration fee.◈ The method of claim 11, wherein the control method is:
In response to the rotation speed of the motor reaching the detection speed during the free spin, obtaining a first vibration signal indicating vibration of the outer tank and a first rotation signal indicating rotation of the motor,
In response to the rotation speed of the motor reaching the detection speed during the main spin, a second vibration signal indicating vibration of the outer tank and a second rotation signal indicating rotation of the motor are obtained. ◈Claim 13 was abandoned upon payment of the setup registration fee.◈ The method of claim 12, wherein controlling the rotation speed of the motor includes:
The motor based on the first phase difference representing the phase difference between the first vibration signal and the first rotation signal and the second phase difference representing the phase difference between the second vibration signal and the second rotation signal A control method of a washing machine comprising controlling the rotation speed of the washing machine. ◈Claim 14 was abandoned upon payment of the setup registration fee.◈ The method of claim 13, wherein controlling the rotation speed of the motor includes:
rotating the motor at a first rotation speed if the amount of change between the first phase difference and the second phase difference is less than a reference value;
When the amount of change between the first phase difference and the second phase difference is greater than the reference value, rotating the motor at a second rotation speed less than the first rotation speed. A washing machine that includes a rotary tub in which laundry is accommodated, a water tank with the rotary tub inside, and a drive motor that rotates the rotary tub, and performs dehydration treatment of the laundry by rotating the rotary tub,
a vibration sensor that detects horizontal acceleration accompanying vibration of the water tank;
a motor sensor that detects a rotation signal of the driving motor;
a waterproof clothing determination unit that determines the presence or absence of waterproof clothing in the laundry based on the detection value of the vibration sensor and the detection value of the motor sensor; and
It includes a rotation control unit that controls the rotation operation of the drive motor,
The rotation control unit controls the operation of the drive motor to perform two acceleration strokes that accelerate the rotation of the rotating tub in a low rotation region lower than a predetermined rotation speed at the start of the dehydration treatment,
The vibration sensor and the motor sensor detect the acceleration and the rotation signal in each of the two acceleration strokes,
The waterproof clothing judgment unit,
Calculating a phase difference between the phase of the acceleration detected by the vibration sensor and the phase of the rotation signal detected by the motor sensor,
A washing machine that determines the presence or absence of the waterproof clothing by comparing the amount of change in the two phase differences calculated for each acceleration stroke with a predetermined reference value. ◈Claim 16 was abandoned upon payment of the setup registration fee.◈ According to clause 15,
The vibration sensor and the motor sensor detect the acceleration and the rotation signal at the same predetermined rotation speed of the two acceleration strokes. delete delete delete ◈Claim 20 was abandoned upon payment of the setup registration fee.◈ According to clause 15,
The rotation control unit controls the operation of the drive motor to rotate the rotary tub at a predetermined rotation speed or less during the dehydration process when it is determined by the waterproof clothing determination unit that there is waterproof clothing.

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