KR20090085748A - Method for controlling drum type wahing machine for dewatering the laundry - Google Patents

Abstract

A dehydration control method of a drum washing machine is provided to minimize vibration and noise generated when a drum rotates over the RPM(Revolution Per Minute) of a low speed resonance band and to perform optimum dehydration in consideration of vibration characteristic according to the rotational direction of the drum. A dehydration control method of a drum washing machine comprises following steps. Eccentricity is measured by varying allowable eccentricity along the rotational direction of a drum(S110,S160). Laundry is dehydrated by rotating the drum at dehydration RPM(S190). The rotational direction of the drum is sensed.

Description

Method for controlling drum type wahing machine for dewatering the laundry

The present invention relates to a dehydration control method of the drum washing machine, and more particularly, to a dehydration control method of the drum washing machine that can reduce the vibration and noise in consideration of the vibration characteristics of the drum washing machine.

In addition, the present invention relates to a drum washing machine and a dehydration control method thereof, which can minimize the vibration and noise problems and conveniently use when the vibration characteristics are different according to the rotation direction of the drum.

In general, a washing machine in a drum washing machine is loaded with laundry into a cylindrical drum, and after washing water and detergent are supplied, washing is performed using friction with the laundry caused by the rotation of the drum and a drop of the laundry and the washing water. The washing of the laundry is completed through a series of strokes such as rinsing, dehydration and drying.

Here, the dehydration stroke is a process of separating the water from the laundry by strong centrifugal force while the drum rotates at a high speed after washing and rinsing.

In other words, when the washing and rinsing process is finished, the drum washing machine rotates the drum quickly so that dehydration is performed from the laundry. The washing is entangled by one of the laundry during the washing and rinsing process. As a guide, an eccentricity is caused that becomes heavy on one side.

This eccentricity causes severe vibration in the drum during dehydration, so that a device for maintaining the rotational balance of the drum is installed to reduce the vibration, which is called a balancer.

Counter weights for drum washing machines have been used as counter weights to compensate for eccentricity by attaching additional mass, but in recent years, a ring-shaped space having a predetermined width in the circumferential direction is formed on the front or rear of the drum. The liquid balancer which filled the liquid into air and completely sealed by heat sealing is employ | adopted mainly.

The centrifugal force, the rotational inertia generated by the drum's rotation, is biased by the eccentricity of the laundry inside the drum. The bias is compensated for by positioning the liquid inside the liquid balancer to the opposite side of the eccentric. Done.

As described above, by the liquid balancer to correct the eccentricity in the drum, the vibration is reduced during rotation of the drum, it is to achieve a stable dehydration.

In addition, in recent years, a ball balancer that puts a ball inside such a liquid balancer and corrects an eccentricity by the movement of the ball may be employed.

Looking at the dehydration control method of the conventional drum washing machine with reference to Figure 1 as follows.

First, the dehydrating stroke of the drum washing machine starts from the inflating step (S10) of releasing the laundry inside the drum.

The inflating step (S10) is to solve the tangling of the laundry by rotating the drum several times at a predetermined rotation speed for a predetermined time in the forward or reverse direction. The rotational speed (RPM) of the drum in the inflating step is a rotational speed such that the artillery inside the drum can be lifted and dropped, which is commonly referred to as tumbling.

Then, after the rotational speed of the drum is accelerated to a certain speed and the constant speed is maintained, the tangled laundry is distributed evenly on the drum, and in this process, the amount of eccentricity of the laundry inside the drum is measured (S20). The rotational speed of the drum in this eccentricity measuring step is a rotational speed such that the fabric inside the drum can be rotated without being in close contact with the inner surface of the drum, which is commonly referred to as spin.

Here, if the measured amount of eccentricity is smaller than the set reference eccentricity, the process proceeds to the next step, and if it is large, the process returns to the inflating step (S10) and goes through the determination step (S30) to perform the inflating again.

If the measured eccentricity is less than the reference eccentricity, the drum is accelerated to a predetermined speed for dehydration (S40), and dehydration is performed at the speed (S50).

On the other hand, since the drum washing machine inevitably passes through the resonance band in the dehydration process as described above, in order to avoid this, the drum washing machine rapidly accelerates the rotation speed of the drum.

For example, in the case of a drum washing machine with a capacity of 10 kg, even if it is determined that the amount of eccentricity is small when checking the amount of eccentricity at about 100 RPM (Revolution Per Minute), in the resonance band of about 170 RPM to 250 RPM, the eccentricity is enormously large, resulting in a lot of vibration and noise. This can happen.

As a result, in order to pass through the above resonant band quickly.

Here, the resonance band refers to a rotation speed section in which vibration is suddenly generated according to the drum rotation speed due to the physical properties of the drum washing machine itself. This resonance band can be obtained experimentally by increasing the rotational speed without putting laundry in the drum.

This resonant band generally appears in two bands. That is, the resonance band at low speed and the resonance band at high speed appear.

For example, the low resonant band appears at 170 to 400 RPM, and at high speed is around 800 RPM.

However, in the conventional drum washing machine, the inflating step or the eccentric measurement step is performed at RPM below the low speed resonance band. Therefore, although it is effective for the vibration and noise blocking due to the eccentricity at low speed, there is a problem that the RPM is gradually increased and the vibration or noise when the drum rotates at high speed is vulnerable.

In particular, in general, the RPM during dehydration is higher than the RPM of the high speed resonance band, and there is a problem that the vibration or noise during the dehydration at or near the RPM of the high speed resonance band is weak. This is because some of the eccentricity is solved by the inflating step or the eccentricity measurement at low speed to solve the problems of vibration and noise at low speed, but there is still an eccentric problem which may cause vibration and noise at high speed.

In addition, conventionally, only the acceleration of the rotational speed of the drum to rapidly pass through the high speed resonance band, and the correlation between the high speed resonance band and the cancellation of vibration and noise at high speed have not been considered.

On the other hand, the drum washing machine according to the related art may have different vibration characteristics according to the rotation direction of the drum due to its structural features.

As shown in FIG. 2, a spring 22 or a damper 24 is installed to absorb the vibration generated as the drum 30 rotates, and the spring or the damper is completely symmetrical to the left and right when viewed from the front of the drum. There may not be. For example, one damper may be installed on the left side of the drum, and two dampers may be installed on the right side. This is also a problem that can arise from placing complex components inside the drum washing machine.

Thus, the vibration characteristics when the drum rotates clockwise CW and when rotated counterclockwise CW may vary. That is, for example, when the drum rotates clockwise, the vibration characteristic is relatively good, and when the drum rotates counterclockwise, the vibration characteristic can be relatively disadvantageous.

In addition, the problem may occur depending on the position of the drain damper 24 or the drain hose for draining the wash water inside the tub 20 as well as the damper 24 and the spring 22.

However, in the conventional drum washing machine, since dehydration is performed without considering the vibration characteristics of the drum in the rotational direction, there is a problem that the vibration and the noise increase when the drum rotates in a relatively unfavorable direction and the dehydration proceeds.

The present invention aims to overcome the problems of the prior art described above.

More specifically, an object of the present invention is to provide a dehydration control method of a drum washing machine for minimizing vibration and noise generated as the drum rotates at a high speed.

In addition, an object of the present invention is to provide a dehydration control method of a drum washing machine for minimizing vibration and noise generated when the drum rotates at a low speed resonance band RPM or more.

In addition, an object of the present invention is to provide a drum washing machine that can detect whether the pair eccentricity is not solved by general fold or eccentric measurement to minimize the vibration and noise lowered thereby to improve the user satisfaction.

An object of the present invention is to provide a dehydration control method of a drum washing machine that can be optimally dewatered in consideration of the vibration characteristics according to the rotation direction of the drum.

In addition, it is an object of the present invention to provide a dehydration control method of a drum washing machine in which vibration and noise are minimized during dehydration in consideration of the rotation direction of the drum.

In order to achieve the above object, the present invention comprises the steps of measuring the eccentricity by varying the allowable eccentricity according to the rotation direction of the drum; And it provides a dewatering control method of the drum washing machine comprising a dewatering step of rotating the drum by dehydration RPM.

And, the control method preferably further comprises the step of sensing the rotation direction of the drum.

The eccentric measurement step may be performed a plurality of times. The drum rotation speed (RPM) for eccentricity measurement may be a fixed value or a variable value. In the latter case, as the eccentric measurement step is repeated, the RPM for eccentricity measurement may vary.

In addition, the control method may further include a foaming step of eliminating the tangling of the laundry in the drum by rotating the drum at a rotational speed lower than the drum rotational speed in the eccentric measurement step.

In order to achieve the above object, the present invention also comprises a dehydration step of rotating the drum in dehydration RPM; And it provides a dehydration control method of the drum washing machine comprising the step of detecting an allowable condition that varies depending on the rotation direction of the drum to enter the dehydration step.

The control method may further include measuring an eccentricity by rotating the drum, and the eccentric measuring step may be performed a plurality of times. In addition, as the eccentric measurement step is repeated, the drum rotation speed for the eccentric measurement may vary.

Here, the allowable condition may be satisfied when the allowable eccentricity is set differently according to the rotation direction of the drum. Further, the allowable condition may be satisfied when the allowable eccentricity is less than the allowable eccentricity and the rotation direction of the drum is a specific direction. Of course, the allowable condition may be satisfied when the rotation direction of the drum is a specific direction.

In addition, the unfolding step may be performed when the allowable condition is not satisfied.

On the other hand, the present invention minimizes the generation of vibration and noise in consideration of the vibration characteristics according to the rotational direction of the drum as described above, and also of the drum washing machine for detecting a pair of eccentricity (diagonal load) that is difficult to detect by general eccentric detection Provide a dehydration control method.

To this end, the control method according to the present invention includes an acceleration step of increasing the drum rotation speed for dewatering; Detecting whether there is a pair of eccentricity (diagonal load) in the acceleration step; And it may further comprise a determining step of determining the dehydration RPM according to whether the eccentricity detected in the sensing step.

Here, the dehydration RPM may include a normal dehydration RPM and an eccentric dehydration RPM lower than the normal dehydration RPM determined in the determination step.

At this time, the eccentric dehydration RPM is preferably higher RPM than the high speed resonance RPM of the drum washing machine.

The sensing step may detect whether the eccentricity is measured by measuring the time required for the acceleration step, and may detect whether the eccentricity is measured by measuring the RPM measured after a predetermined time after the acceleration step starts.

According to the present invention, it is possible to provide a drum washing machine that is easy to use by overcoming the above-described problems of the prior art.

More specifically, according to the present invention can provide a dehydration control method of the drum washing machine to minimize the vibration and noise generated as the drum rotates at a high speed.

In addition, according to the present invention can provide a dehydration control method of the drum washing machine for minimizing the vibration and noise generated when the drum rotates above the low speed resonance band RPM.

In addition, it is an object of the present invention to provide a drum washing machine that can detect whether the pair eccentricity is not solved by the general fold or eccentric measurement to thereby reduce the vibration and noise to improve the user satisfaction.

According to the present invention, it is possible to provide a method for controlling dehydration of a drum washing machine in which optimal dehydration can be performed in consideration of vibration characteristics according to the rotation direction of the drum.

In addition, in consideration of the rotation direction of the drum may provide a dehydration control method of the drum washing machine to minimize the generation of vibration and noise during dehydration.

Therefore, according to the present invention, it is possible to provide a dehydration method of a drum washing machine in which vibration and noise are minimized according to the rotational direction of the drum, and in addition, even when there is a pair of eccentricity, a dehydration method of the drum washing machine in which vibration and noise are minimized. Can be provided.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to enable the disclosed contents to be thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art. Like numbers refer to like elements throughout.

2 is a schematic configuration diagram of an example of a drum washing machine to which the dehydration control method of the drum washing machine according to the present invention is applied.

Referring to FIG. 2, the drum washing machine includes a case 10 forming an exterior, a tub 20 installed in the case 10 and receiving wash water, and a cylindrical shape rotatably installed in the tub 20. The drum 30 is installed on the rear side of the tub 20 and is made of a large motor 40 for generating a rotational force by receiving power.

The door 12 is installed at the center of the front of the case 10 so that laundry can be put into the drum 30 and taken out. The door 12 is hinged to the case 10 to open and close.

A hanging spring 22 through which the tub 20 is suspended is installed between an upper side of the outer peripheral surface of the tub 20 and an inner side of the upper surface of the case 10, and a lower side of the outer peripheral surface of the tub 20 and the case 10. The damper 24 is provided between the lower surfaces to damp the vibration of the tub 20 generated during dehydration.

A gasket 26 is provided between the door 12 and the tub 20 to prevent the leakage of the wash water, thereby maintaining airtightness.

On the inner circumferential surface of the drum 30, lifts 32 are formed at regular intervals along the circumferential direction to agitate laundry and washing water.

In addition, the motor 40 is composed of a stator 42 fixed to the rear of the tub 20 and a rotor 44 installed outside the stator 42, and the drum shaft 46 includes the rotor 44. And the drum 30 is directly connected to transmit the rotational force to the drum 30.

On the other hand, the front surface of the drum 30 is formed in a ring-shaped in the circumferential direction is filled with salt water in the inside having a predetermined width and is provided with a liquid balancer 50 completely sealed by heat fusion.

However, according to the present invention the balancer does not necessarily need to be a liquid balancer. Also, it does not have to be a ball balancer. That is, the form of such a balancer can be variously modified in the present invention, it is also possible to use a general counter-weight balancer. Therefore, hereinafter, a liquid balancer will be described as an example of a balancer, and another type of balancer will be apparent to those skilled in the art, and thus a detailed description thereof will be omitted.

3 is a cross-sectional view of the liquid balancer cut along the circumferential direction.

Referring to FIG. 3, a plurality of partitions 52 are installed in the liquid balancer 50 so as to partition the space inside the body of the liquid balancer 50 at regular intervals along the radial direction and form concentric circles with the outer circumferential surface.

Each space partitioned by the partition wall 52 is filled with a certain amount of liquid 54 which serves as a balancing function, and the liquid 54 may be brine.

A first baffle 56 and a second baffle 57 are radially attached to the inner circumferential surface of the outer portion of the body of the liquid balancer 50 and the inner circumferential surfaces of the partitions 52 and have a predetermined height in the inward direction.

Specifically, the first baffle 56 and the second baffle 57 maintain a predetermined distance and are alternately installed, and disposed radially. The first baffle 56 has a height that is 70 percent of the gap between the partition walls 52, and the second baffle 57 has a height that is 50 percent of the height of the first baffle 56. It is provided.

The first baffle 56 serves to distribute the liquid 54 well in the circumferential direction of the liquid balancer 50 by centrifugal force when the drum 30 rotates, and the second baffle 57 The first baffle 56 serves to suppress the vibration of the liquid 4 by suppressing the shaking.

Hereinafter, embodiments of the dehydration control method of the drum washing machine according to the present invention will be described in detail.

4 is a flowchart illustrating an embodiment of a method for controlling dehydration of a drum washing machine according to the present invention, and FIG. 5 is a graph illustrating a rotation speed of a drum that changes with time.

As shown in Figure 4 and 5, one embodiment of the dehydration control method of the drum washing machine according to the present invention is laundry inside the drum 30 while rotating the drum 30 at a first rotational speed (w2) It may comprise a first eccentric measurement step (S110) for measuring the amount of eccentricity of.

In addition, the first acceleration step (S150) of accelerating the rotational speed of the drum 30 in order to distribute the liquid or ball in the liquid balancer 50 installed in the drum 30, and the drum 30 Including a second eccentric measurement step (S160) for measuring the amount of eccentricity according to the distribution of the liquid and the ball in the liquid balancer 50 and the laundry in the drum 30 while rotating at a second rotational speed (w3) Can be done.

Here, w2 in the first eccentricity measuring step S110 is preferably less than the low speed resonance RPM, and w3 in the second eccentricity measuring step is higher than the w2, but preferably lower than the low speed resonant RPM.

That is, it is preferable to measure the eccentricity a plurality of times at different rotational speeds but at a low speed resonance RPM. However, the present invention is not necessarily limited thereto.

On the other hand, the dehydration control method of the drum washing machine according to the present invention, before performing the first eccentric measurement step (S110), further comprises a foaming step (S100) for releasing the laundry tangled in the washing stroke and rinsing stroke. can do.

The inflating step (S100) is a process of driving the motor 40 at a predetermined rotation speed w1 for a predetermined time t1 in the forward or reverse direction, and then rotating the motor 40 several times in the same or opposite direction as the rotation direction. By the process of accelerating and decelerating the rotational speed of the drum 30 through the inflating step (S100), the tangling of the laundry is released.

Here, w1 in the inflating step is preferably a rotational speed so that the laundry is tumbling. Through this step, the entangled fabric is released and laundry is evenly distributed on the inner circumferential surface of the drum during dehydration to prevent vibration and noise.

Then, the drum washing machine measures the first eccentricity inside the drum 30 while the drum 30 is accelerated to the first rotational speed w2 and then maintained at a constant time t2. The measuring step S110 may be performed.

In the first eccentric measurement step (S110), the drum 30 is maintained at a first rotational speed (w2), for example, at a predetermined time (t2) at about 100 RPM, thereby eliminating tangling through the inflating step (S100). A balancing process for evenly dispensing the laundry into the drum 30 may also be performed. Of course, the w2 is preferably a rotational speed at which the laundry is in close contact with the drum to rotate like a drum, that is, the spin RPM or more.

Here, the measurement of the first measurement amount of eccentricity may be made by detecting an RPM variation of the motor 40 by a Hall sensor (not shown) installed in the motor 40.

Then, the controller (not shown) of the drum washing machine may perform the first determination step S120 of comparing the first measurement of the eccentricity measured in the first eccentricity measuring step S110 with a preset first reference eccentricity. .

That is, when the first measurement amount of eccentricity is smaller than the first reference eccentricity, the process proceeds to the first acceleration step S150. When the first measurement amount of eccentricity is larger than the first reference eccentricity, the folding step ( Returning to S100, the process may be repeated.

On the other hand, before the first acceleration step (S150), before the position correction step (S130) for correcting the position of the laundry may be performed.

The position correction step (S130) measures the vibration displacement of the drum 30 while rotating the drum 30 several times at a speed lower than the first rotation speed (w2), when the vibration displacement is less than a predetermined size Until the abdomen is performed.

Here, the measurement of the vibration displacement may be made by a vibration measuring sensor (not shown) installed on one side of the tub 20 to measure the vibration displacement, an acceleration sensor or the like may be used as the vibration measuring sensor (not shown). Can be.

The drum 30 stopped at the end of the position correction step S130 is once accelerated to the first rotation speed w2. The first acceleration step S150 is prepared while the balancing step S140 is performed again while maintaining the first rotation speed w2 at a predetermined time t3.

Then, after the predetermined time t3, the drum washing machine increases the first washing machine to uniformly distribute the liquid balancer 50 without increasing the rotational speed of the drum 30 without decelerating the rotational speed. Step S150 may be performed.

On the other hand, when the drum 30 is in a stopped state or at a low rotational speed, the liquid 54 inside the liquid balancer 50 as a whole is accumulated under the liquid balancer 50 by gravity.

Then, when the rotational speed is increased to generate the centrifugal force that overcomes the gravity of the liquid 54, the centrifugal force gradually moves upward along the circumferential direction of the liquid balancer 50, and the partition 52 inside the liquid balancer 50. The liquid 54 is distributed at a height lower than that of the first baffle 56 for each independent space formed by the space.

At this time, when the laundry inside the drum 30 is biased due to the bias to one side, the liquid 54 corrects the eccentricity while moving again to be symmetrical with the biased side by the amount of the eccentricity.

Meanwhile, in the first acceleration step S150, the rotation speed of the drum 30 is accelerated to a second rotation speed w3, and the second rotation speed w3 is a low speed resonance band of the drum washing machine, that is, the The resonance of the drum washing machine is preferably smaller than the rotational speed of the drum (30).

This is because the rotational speed of the drum 30 is accelerated at a relatively low rotational acceleration in order to distribute the liquid balancer 50 evenly, unlike in the case of the rapid acceleration in order to avoid the resonance region in the related art. This is to prevent the resonance region of the washing machine from being included.

However, as described above, after the liquid 54 is evenly distributed along the circumferential direction of the liquid balancer 50 in the first acceleration step S150, the drum 30 is moved to correct the eccentricity again. ) The eccentricity of) increases and decreases, and vibration and noise may occur.

That is, a change in the amount of eccentricity of the drum 30 in accordance with the distribution of the laundry in the drum 30 and the distribution of the liquid in the liquid balancer 50 causes vibration and noise to occur.

If this is not solved and rapid acceleration is performed to avoid the resonance region, the liquid balancer 50 installed to correct the eccentricity does not play a role, but rather, more vibration and noise are induced in the resonance region. This will adversely affect the stability and reliability of the system.

Therefore, after the first acceleration step S150, the laundry speed and the liquid balancer 50 inside the drum 30 are filled in the drum 30 while maintaining the rotation speed w3 of the drum 30. It is preferable to go through the second eccentric measurement step (S160) for measuring the second measurement eccentricity according to the distribution of the liquid (54).

In the second eccentric measurement step (S160) while maintaining the rotational speed of the drum 30 at the second rotational speed (w3) for a predetermined time (t5), the Hall sensor (Hall Sensor) installed in the motor 40 ( The amount of variation of the RPM of the motor 40 is detected by using the second measurement eccentricity of the entire drum 30.

Then, the controller (not shown) of the drum washing machine performs a second determination step (S170) of comparing the second measurement eccentricity measured in the second eccentric measurement step (S160) with a preset second reference eccentricity.

That is, comparing the second measurement amount of eccentricity with a preset second reference amount of eccentricity, if less than the second reference amount of eccentricity shifts to the second acceleration step (S180), if larger than the second reference amount of eccentricity to correct the internal eccentricity Then, return to the inflating step (S100) and repeat the above process.

By going through the second eccentric measurement step (S160) and the second determination step (S170) as described above, it is possible to grasp the variation in the amount of eccentricity that may be caused by the flow of the liquid 54 in the liquid balancer 50, and dehydration considering this By forming the algorithm, vibration and noise can be prevented, and the stability and reliability of the system can be secured.

On the other hand, if the second measurement amount of eccentricity is within the allowable range, the process proceeds to the second acceleration step S180. In the second acceleration step S180, the rotation speed of the drum 30 is the first acceleration step ( Rapid acceleration to a rotational acceleration (a2) having a value larger than the rotational acceleration (a1) in S150. This is to pass the slow resonant band in the shortest possible time.

Here, in the embodiment of the dehydration control method of the drum washing machine according to the present invention, the position correction step 130 and the balancing step 140 may be controlled to be performed as necessary. In addition, the first eccentric measurement step 110 and the second eccentric measurement step 160 may not be distinguished from each other. In other words, the eccentric steps may be integrated with one another.

As described above, the vibration characteristics of the drum washing machine may vary according to the rotation direction of the drum. For example, the vibration characteristic is good when the drum rotation direction is clockwise (CW), and may be disadvantageous when it is relatively counterclockwise (CCW). For convenience of explanation, it is assumed that vibration characteristics are good when the drum rotation direction is clockwise.

As shown in FIG. 4, the eccentricity is measured in steps S110 and S170. That is, when the eccentricity measured in the eccentricity measuring step is less than or less than the allowable eccentricity, dehydration is performed.

However, in this embodiment, not only the eccentric condition but also the drum rotation direction condition must be satisfied in order to proceed with dehydration. In other words, it is preferable that the condition to be satisfied for dewatering entry includes at least a drum rotation direction condition. Therefore, in this case, detecting the rotational direction of the drum may be included in the eccentric measurement step.

For example, when the drum rotates clockwise with good vibration characteristics, if the measured eccentricity satisfies the allowable eccentricity condition, the dehydration stage may be entered. If the drum rotates counterclockwise, the dehydration stage may be restricted. That is, even if the allowable eccentricity condition is satisfied, if the drum rotates counterclockwise, it does not enter the dehydration step (S190).

That is, when the drum rotates in a counterclockwise direction, as shown in FIG. 4, the inflating step S100 may be performed again, and as shown in FIG. 6, the position correction step S160 may be performed. In other words, even if the allowable eccentricity condition is satisfied, when the drum rotates counterclockwise, dewatering entry is restricted and the previous step is performed again.

Here, for example, when the eccentric measurement step is performed a plurality of times, detecting the rotation direction of the drum may be performed only after the eccentric measurement step (S160) immediately before entering the dehydration.

Therefore, after the final eccentric measurement step (S160), if the measured eccentricity satisfies the allowable eccentricity condition, and detects that the rotation direction of the drum is also clockwise (S170), the dehydration step (S190) is performed through the acceleration step (S180). Done.

Of course, the acceleration step (S180) is rapidly departed from the resonant rotational speed band through the rapid dehydration is performed to the final dehydration RPM.

Hereinafter, another embodiment of the present invention will be described with reference to FIG. 7.

This embodiment is also very similar to the above. That is, the permissible conditions vary depending on the rotational direction of the drum to enter the dehydration step (S190). However, specifically, the amount of eccentricity allowed for dewatering entry is preferably set differently according to the rotation direction of the drum.

That is, it is preferable that the allowable eccentricity is relatively large in the case of the clockwise direction with good vibration characteristics, and the allowable eccentricity is relatively small in the counterclockwise direction. Therefore, in this case, the method may further include detecting a rotation direction of the drum, and this step may be included in the eccentric measurement step. However, since the allowable eccentricity is different according to the rotation direction of the drum, it is preferable to first detect the rotation direction of the drum (S270) and to detect whether the allowable eccentricity is satisfied (S275 and S276).

Therefore, in order for the drum to be accelerated (S190) to proceed with dehydration, the rotation direction of the drum must be sensed (S270), and the amount of eccentricity to be detected is smaller than the allowable eccentricity set according to the detected rotation direction. That is, it is determined whether the allowable eccentricity condition is set differently according to the rotation direction of the drum (S275, S276), and the dehydration step (S190) may be performed only when such a condition is satisfied.

This can be said to ease the conditions for performing dehydration in the drum rotation direction with good vibration characteristics, and consequently to enhance the conditions in the drum rotation direction with adverse vibration characteristics. Therefore, in any case, it is possible to minimize the generation of vibration and noise during dehydration.

Therefore, according to this embodiment and the above-described embodiment, the direction of rotation of the drum is sensed, and subsequent steps are changed accordingly. That is, in the rotational direction of the particular drum, entry into the dehydration stage may be restricted, or the amount of eccentricity allowed for entering the dehydration stage may be relatively enhanced.

As described above, the dehydration control method of the drum washing machine according to the present invention may include the step of measuring the eccentricity at a lower RPM than the low speed resonant RPM (S110, S160). Here, the step of measuring the eccentricity may be performed a plurality of times, and the RPM at this time may be set differently.

However, this eccentricity measurement step is effective for measuring eccentricity when laundry is entangled in a drum or is concentrated in a specific position. In this eccentric measurement stage, the counter eccentricity (diagonal load) cannot be effectively detected.

Here, the pair eccentricity means that the laundry is not evenly distributed in the drum and is placed in a diagonal position. For example, an equal or nearly similar weight of laundry means that the front top of the drum and its diagonal direction are located at the rear bottom of the drum. This eccentricity often occurs when dehydrating unevenly spread laundry.

Although not illustrated but exaggerated, one pair may be located at the front top of the drum and the other at the rear bottom of the drum when the running shoes are dehydrated. In this case, the eccentricity of the drum as a whole can be said to be resolved, and at low speeds, the influence of vibration and noise due to such an eccentricity is less. In addition, it is very difficult to resolve or detect such paired eccentricity through the unfolding step or the measurement of the eccentricity at low speed. This is because the pair eccentric weight is evenly distributed in the drum, and the weight is no longer evenly distributed.

This paired eccentricity causes vibration and noise, especially at high speeds. Therefore, if the normal dehydration RPM is more than 1000RPM in case of eccentricity, the user's satisfaction is lowered due to vibration and noise. On the contrary, in the case where normal dehydration is performed while all of the eccentrics including the paired eccentrics are resolved, vibration and noise are minimized even at high speed.

That is, if normal dehydration proceeds with or without a pair of eccentricity, predetermined dehydration may be completed as a result. However, in some cases, the vibration and noise during normal dehydration is large, and in some cases, the vibration and noise during normal dehydration are not a big problem. Therefore, the user may not trust the product and may determine that an abnormality has occurred in the product.

In addition, when the normal dehydration is repeatedly performed in such a pair of eccentric state, there is a fear that the life of the product due to vibration is shortened.

In order to effectively cope with the problem of the above-described pair eccentricity, the present invention may further comprise detecting the pair eccentricity.

Hereinafter, as an embodiment of the present invention, the paired eccentricity is detected in association with the above-described second acceleration step S180 (S185), and thus a dehydration control method will be described in detail.

According to an embodiment of the present invention, the final dehydration according to the acceleration step of increasing the drum rotation speed (RPM) for dehydration, the detection step of detecting whether the eccentricity in the acceleration step, and whether the eccentricity detected in the detection step A determination step is made to determine the RPM. In addition, the final dehydration in accordance with the determined final dewatering RPM can be made including a final dewatering step.

Also, for example, the detecting of the pair eccentricity may be a measuring step of measuring a time required for the acceleration step.

That is, the present embodiment can be applied to the above-described embodiments, specifically, whether the eccentricity is detected through the second acceleration step S180 (S185), and accordingly, whether the eccentricity is detected in the dehydration step (S190). Accordingly, dehydration RPM, that is, dehydration may be achieved by varying the final dehydration RPM.

In other words, when paired eccentricity is not detected, normal dehydration (S191) may be performed at a normal dehydration RPM, and when paired eccentricity is detected, eccentric dehydration (S192) may be performed at an eccentric dehydration RPM.

As shown in Fig. 9, the drum rotation is accelerated in the second acceleration step. That is, by measuring the time required in the second acceleration step it is possible to detect whether the eccentricity. Here, the second acceleration step preferably has a section that breaks through at least the low speed resonance band, or is accelerated at an RPM higher than the low speed resonance band. Accordingly, the acceleration step of the present embodiment may be the same as the second acceleration step 180 shown in FIG. 5, but is not necessarily the same. In addition, the pair eccentric detection step may be performed throughout the second acceleration step, or may be performed only in a specific section of the second acceleration step.

As mentioned above, vibration and noise due to eccentricity are problematic at high speed RPM, in particular at RPMs above the slow resonant band. Because the vibration and noise at the RPM below the low-speed resonant band is eliminated through the above-described unfolding step (S100), the position correction step (S130), and the balancing step (S140) step, or the eccentric measurement step (S110, S160) Because it can be detected from.

Therefore, in order to effectively detect the paired eccentricity, the accelerated section preferably includes at least the low-speed resonance band.

In addition, there is a problem of detecting whether the pair is eccentric after a lot of noise or vibration caused by the pair eccentricity. Therefore, it may be desirable to detect whether the eccentricity is generated before the noise or vibration due to the paired eccentricity or immediately after the noise or vibration due to the paired eccentricity. To this end, it is very important that the second acceleration step (S180) properly calculate the RPM (Y RPM) to complete the acceleration in order to measure the acceleration time. This will be described later.

The second acceleration step may be accelerated at X RPM to reach Y RPM. In addition, by measuring the time required for the second acceleration step it may be detected whether the eccentricity (S185). Of course, the X RPM to Y RPM section may be a specific section of the second acceleration step. That is, X RPM may be w3 of FIG. 9 and Y RPM may be w4 of FIG. 9. Therefore, it is possible to detect whether the eccentricity by measuring the time it takes to accelerate from X RPM to Y RPM. This is because of the following reasons.

When accelerated at a higher RPM than the slow resonant RPM, it is not accelerated to have a constant slope a2 as shown in FIG. 9. As described above, when there is a pair of eccentricity, vibration and noise are generated at high speed, and thus, the time required for acceleration is inevitably increased. Thus, even if there is no paired eccentricity, it may be accelerated to have a2 slope, but if there is paired eccentricity, the slope is formed more gently.

Therefore, it is possible to detect whether the eccentricity by measuring the time required in the acceleration step. For example, if it takes more time than t6 time shown in FIG. 9, it may be determined that there is a pair eccentricity.

Here, the setting of the final RPM, in particular Y RPM in the second acceleration step (S180) is very important for the following reasons.

It is not desirable that Y RPM be a high speed resonant RPM first. In addition, considering the constant deviation, it is preferable that the RPM deviates within 10 percent of the high-speed resonant RPM. Of course, if the Y RPM is higher than the high-speed resonant RPM it is preferable that this section is accelerated very quickly to escape.

First, the Y RPM may be set to, for example, a high speed resonance RPM or less. Here, below the high speed resonance RPM may be the RPM when the high speed resonance starts, and does not mean that the rotation is continued with this high speed resonance RPM. Thus, in this case, the accelerated RPM band is narrowed. Therefore, there is a fear that the problem due to the eccentricity occurring at high speed may not be sufficiently detected. However, in this case, since the drum rotation at the high speed resonant RPM may be avoided by passing through the high speed resonant RPM or the high speed resonant RPM, it is possible to prevent the erroneous detection detected by the eccentricity due to the vibration at the high speed resonant RPM.

Next, the Y RPM may be set higher than the high speed resonant RPM. In this case, the accelerated RPM band becomes wider. Therefore, it is possible to sufficiently detect the problem due to the eccentricity occurring at high speed. That is, it is possible to further detect the vibration caused by the eccentricity above the high speed resonance RPM. However, in this case, due to the vibration in the high speed resonant RPM, there may be a concern that the misdetection detected by the eccentric.

As a result, the Y RPM may be set in consideration of these problems and advantages.

Then, by measuring the time required in the acceleration step (S180) it is detected whether the eccentricity (S185). Then, the final dehydration RPM is determined according to the paired eccentricity, the final dehydration is performed according to the determined final dehydration RPM (S190, S195).

Here, the final dewatering RPM is preferably at least two different RPM.

For example, if no eccentricity is detected, the final dewatering RPM may be a normal dehydration RPM. The normal dehydration RPM may be set to 1000 RPM or more, which may be a RPM set before the acceleration step. In addition, the normal dehydration RPM may be a predetermined RPM by the user selects a washing course or a dehydration option. In addition, when the paired eccentricity is detected, the final dehydration RPM may be an eccentric dehydration RPM lower than the normal dehydration RPM.

Of course, the final dewatering RPM can be subdivided into various ways depending on the degree of the eccentricity detected. That is, there may be various subdivisions between the normal dehydration RPM and the eccentric dehydration RPM.

Here, the eccentric dehydration RPM may be set higher than the high speed resonance RPM. That is, it may be set to the minimum RPM beyond the resonant RPM. In addition, the eccentric dehydration RPM may be set lower than the high speed resonance RPM. In this case, of course, it should be set higher than the low speed resonant RPM.

For example, when the eccentric dehydration RPM is set higher than the high speed resonance RPM, the final RPM in the acceleration step may be set to be the same as the eccentric dehydration RPM. That is, when the counter eccentricity is detected in the acceleration phase, the final dehydration can be performed immediately by the eccentric dehydration RPM. Therefore, it is possible to omit a separate acceleration step to reach the eccentric dehydration RPM. In this case, however, it must be accelerated to pass through the high speed resonant RPM, so the vibration and noise generated due to this will be tolerated.

On the contrary, when the eccentric dehydration RPM is set lower than the high speed resonant RPM, the final RPM may be the eccentric dehydration RPM. In this case, since it does not pass the high-speed resonant RPM it can avoid the vibration and noise caused by this. However, since the final RPM is bound to be lowered, the final dewatering efficiency will be lowered even if vibration and noise suppression are aside.

That is, in the case of eccentric dehydration (S195), the final dewatering efficiency is lower than in the case of normal dehydration (S190), but it is possible to significantly reduce or prevent vibration and noise at high speed due to paired eccentricity. In addition, the eccentric dehydration RPM can be determined between approximately 700 RPM and 900 RPM close to it without being affected by the high speed resonance RPM, thereby obtaining a minimum dehydration effect.

On the other hand, the above embodiment was characterized by detecting whether the eccentricity by the time required in the acceleration step. However, the present invention is not limited thereto, and it may be detected whether the eccentricity is detected by measuring the RPM. Explain this.

In the acceleration step of increasing the drum rotation speed for dehydration, the above-described low-speed resonant RPM and the above-mentioned effects of vibration and noise due to eccentricity are described above. Therefore, due to its influence, it is difficult to accelerate with a predetermined acceleration (tilt).

For example, when the acceleration from X RPM to Y RPM as described above, the time required for acceleration is different depending on whether the eccentricity. For example, it may take 80 seconds from X RPM to Y RPM in the normal case of no eccentricity. This means that if there is a pair eccentricity it may take longer than 80 seconds from X RPM to Y RPM.

In other respects, when 80 seconds have elapsed after the start of the acceleration at X RPM, the current RPM can be measured to detect whether the RPM is Y RPM. In this case, if the detected RPM reaches 80 RPM or close to Y, it may be determined that there is no eccentricity. On the contrary, if it does not reach Y RPM after 80 seconds, it may be determined that there is a pair eccentricity.

Therefore, by measuring the RPM after a predetermined time after the start in the acceleration step, it is possible to detect whether the eccentricity according to the measured RPM. In addition, the final dehydration RPM will be determined according to whether the eccentricity.

10 is a flowchart illustrating a dehydration control method of a drum washing machine according to another embodiment.

Referring to Figure 10, it can also be seen that dehydration is made by varying the final dehydration RPM depending on whether the eccentricity. However, it can be seen here that the condition for dewatering entry is an allowable eccentric amount which is set differently according to the drum rotation direction. The description thereof will be omitted since it overlaps with the description of the above-described embodiments.

Likewise, in the present embodiment, if the allowable eccentricity condition is not satisfied in the determination steps S275 and S276, the process subsequent to returning to the position correction step S130 may be repeated without returning to the swollen step S100. have.

In most cases, the second measurement amount of eccentricity has a smaller value than the first measurement amount of eccentricity and is balanced with the position correction step S130 even if the second measurement eccentricity is performed again from the position correction step S130 without starting from the inflation step S100. This is because the eccentricity is likely to be corrected through step S140.

In addition, the case where the second measurement amount of eccentricity is larger than the second reference eccentricity is divided in detail, and when the second measurement amount of eccentricity is equal to or less than a predetermined value, the process returns to the position correction step S130, and when the value is greater than or equal to the predetermined value, the folding step S100 is performed. You could also form an algorithm to run.

In the above-described embodiment, the eccentric measurement step of detecting the amount of eccentricity has been described as two steps, but is not limited thereto. That is, according to the present invention, the final dewatering depends on the rotational direction of the drum associated with the eccentricity measuring step immediately before entering the dehydration, the allowable eccentricity depending on the rotational direction of the drum, whether the eccentricity is detected while being accelerated for dehydration, and whether the eccentricity is paired. It is desirable to have at least one feature of RPM.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to various modifications and changes to the present invention without departing from the spirit and scope of the invention described in the claims described below You can do it. Therefore, it should be seen that all modifications included in the technical scope of the present invention are basically included in the scope of the claims of the present invention.

1 is a flowchart illustrating a dehydration control method of a conventional drum washing machine;

2 is a schematic configuration diagram of a drum washing machine to which the dehydration control method of the drum washing machine according to the present invention is applied;

3 is a cross-sectional view of the liquid balancer cut along the circumferential direction;

4 is a flowchart illustrating a dehydration control method of a drum washing machine according to an embodiment of the present invention;

5 is a graph showing the rotational speed of the drum changes over time of one embodiment of the present invention;

6 is a flow chart showing a modified form of the dehydration control method of an embodiment of the present invention;

7 is a flowchart illustrating a dehydration control method of a drum washing machine according to another embodiment of the present invention;

8 is a flowchart illustrating a dehydration control method of a drum washing machine according to another embodiment of the present invention;

9 is a graph showing the rotational speed of a drum that changes with time in another embodiment of the present invention; And

10 is a flowchart illustrating a method of controlling dehydration of a modified form according to another embodiment of the present invention.

** Description of symbols for the main parts of the drawing **

10: case 20: tub

30: drum 40: motor

50: liquid balancer S100: inflated step

S110: first eccentric measurement step S150: first acceleration step

S160: second eccentric measurement step S180: second acceleration step (acceleration step)

Claims (20)

Measuring the eccentricity by varying the allowable eccentricity according to the rotation direction of the drum; And Dewatering control method of the drum washing machine comprising a dewatering step of rotating the drum by dehydration RPM. The method of claim 1, Dehydration control method of the drum washing machine characterized in that it further comprises the step of detecting the rotation direction of the drum. The method of claim 1, Dehydration control method of the drum washing machine, characterized in that the eccentric measurement step is performed a plurality of times. The method of claim 3, wherein Dehydration control method of the drum washing machine, characterized in that the drum rotation speed for the eccentric measurement is changed as the eccentric measurement step is repeated. The method of claim 1, The dewatering control method of the drum washing machine, characterized in that it further comprises a foaming step of eliminating the tangling of the laundry in the drum by rotating the drum at a rotational speed lower than the drum rotational speed in the eccentric measurement step. A dehydration step of rotating the drum at a dehydration RPM to dehydrate it; And Dehydration control method of the drum washing machine comprising the step of detecting an allowable condition that depends on the rotation direction of the drum to enter the dehydration step. The method of claim 6, Dehydration control method of the drum washing machine characterized in that it further comprises the step of measuring the eccentricity by rotating the drum. The method of claim 7, wherein Dehydration control method of the drum washing machine, characterized in that the eccentric measurement step is performed a plurality of times. The method of claim 8, Dehydration control method of the drum washing machine, characterized in that the drum rotation speed for the eccentric measurement is changed as the eccentric measurement step is repeated. The method according to any one of claims 7 to 9, The permissible condition is a dewatering control method of the drum washing machine, characterized in that it is satisfied when it is less than the allowable eccentricity set differently according to the rotation direction of the drum. The method according to any one of claims 7 to 9, The permissible condition is less than the allowable eccentricity and the dehydration control method of the drum washing machine characterized in that it is satisfied when the direction of rotation of the drum is a specific direction. The method of claim 6, The permissible condition is a dewatering control method of a drum washing machine, characterized in that it is satisfied when the rotation direction of the drum is a specific direction. The method of claim 12, Dehydration control method of the drum washing machine characterized in that it further comprises the step of measuring the eccentricity by rotating the drum. The method of claim 12, The dewatering control method of the drum washing machine, characterized in that it further comprises a foaming step of eliminating the tangling of the laundry in the drum by rotating the drum at a rotational speed lower than the drum rotational speed in the eccentric measurement step. The method of claim 14, The dewatering control method of the drum washing machine, characterized in that when the allowable condition is not satisfied, the foaming step is performed. The method of claim 6, An acceleration step of increasing drum rotation speed for dewatering; Detecting whether there is a pair of eccentricity (diagonal load) in the acceleration step; And Dehydration control method of the drum washing machine characterized in that it further comprises a determining step of determining the dewatering RPM according to whether the eccentricity detected in the sensing step. The method of claim 16, Dehydration RPM determined in the determining step is a dehydration control method of the drum washing machine, characterized in that it comprises a normal dehydration RPM and eccentric dehydration RPM lower than the normal dehydration RPM. The method of claim 17, The eccentric dewatering RPM is a dewatering control method of the drum washing machine, characterized in that the higher RPM than the high speed RPM of the drum washing machine. The method of claim 16, The detecting step is a dehydration control method of the drum washing machine, characterized in that for detecting whether the eccentricity by measuring the time required for the acceleration step. The method of claim 16, The detecting step is a dehydration control method of the drum washing machine, characterized in that for detecting whether the eccentricity by measuring the RPM measured after a predetermined time after the start of the acceleration step.

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