KR20210014315A - A control method of the laundry apparatus - Google Patents

Abstract

The present invention is to provide a laundry treatment apparatus capable of preventing excessive vibration by accelerating a drum in a state in which water is present in a tub when performing a spin-drying cycle. More particularly, the present invention relates to a control method of a laundry treatment apparatus comprising: a water supply step of supplying water from the tub; a drum rotating step of rotating the drum; a drain rotation step of draining the water from the tub while rotating the drum; and a high-speed rotation step of rotating the drum at a higher speed than that of the drum rotation step. The control method performs a laundry weight detecting step of detecting the laundry weight of the clothes when the water in the tub is drained in the drain rotation step.

Description

A control method of the laundry apparatus {A control method of the laundry apparatus}

The present invention relates to a control method of a laundry treatment apparatus. More specifically, it relates to a control method of a laundry treatment apparatus that detects the amount of cloth in order to perform a dehydration stroke.

In general, a laundry treatment device refers to a device capable of washing, drying or washing or drying clothes. Here, the laundry treatment apparatus may perform only a washing or drying function, or may perform both washing or drying.

In general, when the laundry treatment device is provided with a washing machine including a drum capable of applying physical force by rotating clothes, the laundry treatment device applies a physical force to the clothes to remove foreign matters, and separates foreign matters from the clothes. A rinse cycle and a dehydration cycle to remove moisture from the garment may be performed.

In general, the spin-drying stroke rotates at a higher speed than the rotating speed of the drum for accommodating clothes in the washing or rinsing stroke. Accordingly, there may be a difference in drum rotational speed, acceleration, and permissible vibration values for performing the dehydration stroke according to the amount of clothing. Therefore, the conventional clothes treatment apparatus can detect the amount of clothes in the clothes before performing the dehydration process.

On the other hand, since the dehydration process is performed after the washing process or the rinsing process, the clothing corresponds to a wet cloth containing water. Therefore, even if the amount of dry cloth is detected before the washing cycle, since the amount of wet cloth may vary depending on the material or condition of the clothes, it may be necessary to additionally detect the amount of wet cloth before the dehydration cycle.

1 shows a process of performing a dehydration operation of a conventional laundry treatment apparatus.

Referring to FIG. 1, in the conventional laundry treatment apparatus, when the washing or rinsing cycle is finished, the drum rotation is stopped and the drain pump is driven. When the drainage is completed (c), the conventional laundry treatment apparatus performs a cloth volume sensing step (s1) of accelerating the drum and then measuring the current value of the driving unit rotating the drum in the process of deceleration to detect the amount of dewatering or the amount of moisture. can do.

Thereafter, after performing the foam dispersing step of rotating the drum at a first speed lower than the drum rotation speed during the rinsing stroke than the washing stroke, the passing step (s3) of raising the drum above the resonance speed is performed, and the An unbalance detection step (s4) of detecting the degree of unbalance of clothes by rotating the drum at a second speed higher than the resonance speed may be performed.

In the conventional clothes processing apparatus, when the unbalance detection value according to the amount of moisture in the clothes is less than or equal to the reference value, an acceleration step (s5) of accelerating the drum to a third speed capable of removing moisture from the clothes is performed, and the drum is third It is possible to perform a dehydration step (s6) of removing moisture from clothes while maintaining the speed.

On the other hand, when the conventional laundry treatment apparatus detects the amount of moisture in the clothes, it determines an unbalanced reference value corresponding thereto. This is to prevent the dehydration stroke from being unnecessarily shorted or interrupted by setting a different allowable unbalance reference value according to the amount of compresses of clothing.

However, the conventional laundry treatment apparatus drains all of the water from the tub in order to detect the amount of moisture when entering the dehydration stroke. Therefore, when the drum is accelerated after detecting the amount of moisture, there is a problem that the vibration width of the tub becomes excessive because it passes through the resonance region in the absence of water in the tub. In addition, when the clothing is eccentric in the drum, since the vibration width becomes larger, there is a problem that the dehydration stroke is short-circuited or stopped.

In addition, unlike the conventional clothes treatment apparatus shown, in the case of applying the residual water dehydration method in which the drum is rotated while draining water in the presence of water, there is a problem that the amount of wetness cannot be accurately measured because water is present in the tub. there was.

In addition, referring to Korean Patent Laid-Open Publication No. 10-2012-0111789, in order to measure the amount of wetness, a conventional clothing treatment apparatus generally takes a method of accelerating the speed of the drum and maintaining the speed of the drum for a certain period of time.

Referring to Figure 1 (a), in order to detect the amount of laundry, a conventional laundry treatment apparatus performs an alignment step of aligning a motor to a basic position, an acceleration step of accelerating the drum, and rotating the drum at a constant speed. A holding step of maintaining the drum and a stop step of decelerating and stopping the drum were performed.

In this process, the amount of cloth accommodated in the drum was sensed based on a current flowing in the driving unit rotating the drum during the acceleration period and the current flowing in the driving unit during the constant velocity period.

Specifically, in order to detect the amount of cloth through the above process, the conventional laundry treatment apparatus uses the following equation.

Ldata means the detection value of the laundry. emf_com is the compensated back EMF value of the driving unit, iq*_ATb is the average current command value added in the acceleration section, and iq*_ATc is the average current command value added in the constant speed section. The removal of the average current command value of the constant speed section from the current command value of the acceleration section is to detect the correct amount of cloth by removing the current value added by the friction of the driving unit itself.

In this case, the current command value is not a current value output from the driving unit, but a current value supplied to rotate the driving unit at a desired speed.

Meanwhile, in order to obtain the compensation value of the back electromotive force, the conventional clothes processing apparatus needs to separately measure the average value of the back electromotive force (emf_ATc) and the voltage error (V).

Meanwhile, in order to obtain the average value (emf_ATc) of the back electromotive force, the back electromotive force (emf) must be calculated, and the back electromotive force is the voltage command value (Vq*) of the constant speed rotation section, the motor constant (RS), and the current command value of the constant speed section. It is only possible to calculate (iq*_Tc) by measuring it.

In other words, since the conventional clothing treatment apparatus uses a constant velocity section as well as an acceleration section to detect the amount of wetness, it is essential to measure the back EMF generated in the process of maintaining the constant velocity. In order to measure the back EMF, a voltage command value and, The current setpoint must be measured.

In addition, the conventional clothing processing apparatus must first measure both the voltage command value and the current command value, and secondly calculate a voltage error based on the measured voltage value and current value, and then calculate the compensation value of the back EMF, Finally, it is necessary to calculate the current value lost in the frictional force of the driving unit described above.

As a result, conventional clothes handling apparatuses must measure both voltage and current values to calculate the amount of wetness, and in order to detect the exact amount of wetness, a total of three compensations or tunings: voltage error, back electromotive force compensation, and frictional force compensation in the calculation formula. There is a hassle to consider.

Therefore, the conventional clothes handling apparatus did not immediately use the value output from the driving unit to detect the amount of cloth, but had to perform calculation, tuning, and compensation, and the exact amount of cloth according to the frequency of error occurrence and the method of considering the error. There was an undetectable problem. In addition, in the process of compensating for the error three times, an accurate value was not derived, and the value was changed each time the measurement was repeated, and thus there was a problem in that the detection value of the amount of wetness was not reliable. Furthermore, there is a problem in that a lot of time is required to detect the amount of cloth since the motor has a constant speed and time to maintain it.

An object of the present invention is to provide a laundry treatment apparatus that prevents excessive vibration by accelerating a drum in the presence of water in a tub when performing a dehydration stroke.

An object of the present invention is to provide a laundry treatment apparatus for accelerating a drum above a resonance speed in the presence of water in a tub.

An object of the present invention is to provide a laundry treatment apparatus capable of detecting the amount of wetness while the drum is rotating.

An object of the present invention is to provide a laundry treatment apparatus capable of detecting the amount of moisture even when the tub enters the dehydration process in the presence of water.

An object of the present invention is to provide a laundry treatment apparatus that improves the accuracy and speed of detecting the amount of wetness through acceleration and deceleration of a drum.

An object of the present invention is to provide a laundry treatment apparatus for setting a determination reference value capable of determining whether or not there is unbalance even when dehydration is entered even when water is contained in a tub.

An object of the present invention is to provide a laundry treatment apparatus capable of solving excessive vibration when a dehydration operation is started in the presence of water.

The laundry treatment apparatus of the present invention performs drainage at a drum speed higher than the resonance speed, and detects unbalance after reaching a certain time. For example, after reaching 120 rpm and draining, unbalance detection is performed from 7 seconds later.

The laundry treatment apparatus of the present invention detects the amount of dewatering after detecting unbalance for a certain time and performing drainage. For example, after detecting and draining the unbalance for 120 seconds, the amount of dehydration is detected.

In addition, the laundry treatment apparatus of the present invention detects the amount of dewatering by accelerating and decelerating the drum. However, a process of stopping the power supply to the drive is added between acceleration and deceleration. For example, after accelerating from 120rpm to 170rpm, when reaching 170rpm, free braking is applied for 500ms time. This is to remove the noise that may occur in case of sudden power generation braking, and power generation braking is performed after a certain period of spare braking. Therefore, power generation braking is performed up to 110rpm after 500ms spare braking.

On the other hand, the deceleration section lowers the speed more than before the acceleration section. For example, in order to secure accurate data at (~120rpm after free space), it decelerates to 110rpm and accelerates again.

In the laundry treatment apparatus of the present invention, when detection of the amount of dewatering is completed, the drum is accelerated again to enter a section where the tub shakes up and down a lot.

The present invention has an effect of preventing excessive vibration by accelerating the drum in the state of water in the tub when performing the dehydration stroke.

The present invention has the effect of solving the acceleration of the drum above the resonance speed in the state of water in the tub.

The present invention has the effect of being able to start detecting the amount of compresses while the drum is rotating.

The present invention has the effect of being able to detect the amount of compresses even when entering the dehydration process in the presence of water in the tub.

The present invention has the effect of increasing the accuracy and speed of detection of the amount of wetness through acceleration and deceleration of the drum.

The present invention has an effect of setting a determination reference value capable of determining whether or not there is unbalance even when dehydration is entered even in a state in which water is contained in the tub.

1 shows a dehydration process of a conventional laundry treatment apparatus.
Figure 2 shows the structure of the laundry treatment apparatus of the present invention.
3 is a block diagram of a laundry treatment apparatus according to the present invention.
Figure 4 shows an embodiment of the control method of the present invention.
5 is a graph of the dehydration process of the laundry treatment apparatus according to the present invention.
Figure 6 shows a method of operation of the driving unit of the present invention laundry treatment apparatus.
Figure 7 shows the operating principle of the driving unit of the laundry treatment apparatus of the present invention.
Fig. 8 is a diagram illustrating that the laundry treatment apparatus of the present invention detects the amount of cloth through the driving unit.
9 shows a case in which a short circuit occurs in the dehydration stroke of the present invention.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings. In the present specification, the same or similar reference numerals are assigned to the same or similar configurations even in different embodiments, and the description is replaced with the first description. Singular expressions used in the present specification include plural expressions unless the context clearly indicates otherwise. In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, it should be noted that the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification and should not be construed as limiting the technical idea disclosed in the present specification by the accompanying drawings.

Figure 2 shows the structure of the laundry treatment apparatus of the present invention.

The laundry treatment apparatus 100 according to an embodiment of the present invention includes a cabinet 1 forming an exterior appearance, a tub 3 provided inside the cabinet to store water, and a drum 4 provided inside the tub to store clothes. It can be provided as.

The cabinet 1 is provided with an opening 12 for inserting clothing into the drum or for drawing out clothing stored in the drum, and a door 13 for opening and closing the opening 12.

The laundry treatment apparatus 100 according to an embodiment of the present invention may be provided in a top load type provided with the opening 12 on the upper panel 11 provided on the top of the cabinet 1. However, it is not excluded that the inlet 12 of the laundry treatment apparatus is provided in a front load type provided in the front of the cabinet 1.

The upper panel 12 may be provided parallel to the ground. In addition, as shown in FIG. 1, the upper panel 12 may be provided in an inclined manner, and the upper panel 12 may be provided in an inclined manner so that the rear is higher than the front of the cabinet 1. This increases the volume of the upper area of the cabinet 1 to secure a space in which various components such as the water supply unit 21 can be installed inside the cabinet 1, and at the same time, the user can easily enter the tub 3 It is intended to allow access to (33).

In front of the upper panel 12, a control panel 14 for controlling the operation of the laundry treatment apparatus may be provided, and a display portion 14b may be provided to display the current state of the laundry treatment apparatus. Specifically, the control panel 14 may be provided with a display unit 14b for displaying the state of the laundry treatment apparatus and an input unit 14a for inputting an operation command to the laundry treatment apparatus. The display unit 14a may be provided as a display unit having a liquid crystal, and the input unit 14b may be provided as a button or a touch panel.

The tub 3 accommodated and provided in the cabinet 1 includes a tub body 31 providing a space for storing water, and is provided on an upper surface of the tub body 31 to provide the opening 12 and It may include a tub inlet 33 to communicate. In addition, the tub 3 may include a tub cover 37 to prevent backflow and outflow of water contained in the tub 3. The tub cover 37 is provided on the upper side of the tub body 31 and the tub inlet 33 is provided on an inner circumferential surface.

The tub body 31 may be fixed to the cabinet 1 through the tub support 35. The tub support portion 35 is composed of a spring, a damper, etc. to attenuate the vibration of the tub 3.

The tub body 31 may receive water through the water supply unit 21 to store water. The water supply unit 21 may include a water supply pipe 211 connected to an external water supply source, and a water supply valve 212 for controlling a flow rate of water moving the water supply pipe 211 by adjusting an opening degree of the water supply pipe 211. . Further, although not shown, the water supply pipe 211 may be provided separately as a cold water pipe and a hot water pipe.

The water supply pipe 211 may be provided extending from the water supply valve 212 to the upper portion of the tub inlet 33, and to be provided in communication with one side of the tub cover 37 or one side of the tub body 31. I can. That is, the water supply pipe 211 may be provided in any shape and structure as long as it can supply water to the tub 3.

The water stored in the tub 3 is discharged to the outside of the cabinet 1 through the drain 22, and the drain 22 guides the water inside the tub 3 to the outside of the cabinet 1 A drain pipe 221 and a drain pump 222 may be included.

Although not shown, the drain pipe 221 may be provided to extend a predetermined length from the bottom surface of the tub 3 to the upper portion of the tub 3 so that the tub 3 can store water. The tub 3 may be provided with a water level sensing unit 9 that measures the water level inside the tub 3.

The drum 4 may include a drum body 41 providing a space for storing clothes, and a drum base 42 constituting a bottom surface of the drum 4. The drum body 41 may be provided with a drum inlet 43 communicating with the tub inlet 33 at the top.

The drum body 41 and the drum base 42 may be rotatably provided inside the tub 3, and the inner circumferential surface of the drum body 41 and the drum base 42 have the inside of the tub 3 A number of through holes 411 for introducing water into the drum 4 may be provided.

On the other hand, the inner circumferential surface of the drum body 41 may be provided with a flow path portion 44 to move the water at the bottom of the drum 5 to the upper portion of the drum (5). That is, the flow path part 44 may be provided to extend from the drum base 42 to a predetermined height of the inner circumferential surface of the drum body 41.

The flow path part 44 constitutes the main body of the flow path part, the flow path body 411 forming a flow path for moving water near the drum base 42 to the upper side of the drum body 41, and the flow path body ( It may include an inlet 442 provided below the drum 4 through which water flows into the drum 4. At this time, the flow path body 441 may be formed as a flow path through which water introduced from the lower portion of the drum 4 flows to the top of the drum 4, but may be provided as a housing having an opening toward the drum body 41. I can.

The flow path body 441 may be provided on an outer wall of the drum body 41, or may extend from the drum base 42 to an inner circumferential surface of the drum body 41.

The flow path body 441 may be configured on an outer wall of the drum body 41, and one surface of the flow path body may form one surface of the drum body 41.

The drum 4 may further include a cutout 423 penetrating through the drum base 42 so as to transfer water contained in the drum 4 to the flow path part 44. Accordingly, water inside the drum 4 may flow out to the cutout portion 423 and flow into the inlet portion 412 provided in the flow path portion 44. That is, water inside the drum 4 may flow out of the drum body 41 and flow back into the flow path part 44 provided in the drum body 41.

Meanwhile, the flow path part 44 may include a filter part 7 that filters water introduced into the flow path part 44 and then discharges it back to the drum. The filter part 7 is preferably provided on one side of the flow path body 441 facing the drum body 41 because the water flowing into the flow path part 44 needs to be discharged back to the drum 4.

In addition, the filter part 7 may form one surface of the flow path body 411, and may be provided as a separate member from the flow path body 441 so as to be detachably provided in the flow path part 44. Accordingly, the filter unit 9 may be provided to form an inner circumferential surface of the drum body 41. In the process of flowing water under the drum 4 into the flow path part 44 and being discharged to the filter part 7, foreign substances contained in the water contained in the drum 4 may be removed.

On the other hand, the drum 4 includes a water flow forming unit 6 for forming a pressure and a water flow for flowing the water inside the drum 4 to the cutout 423 and flowing into the flow path 44. I can.

The water flow forming part 6 may be rotatably provided on the drum base 42 or may rotate separately from the drum 4. The water flow forming part 6 may rotate on the drum base 42 to form a water flow so that a part of the water in the drum 4 may flow out to the cutout 423.

The water flow forming part 6 is provided with a disk-shaped water flow forming body 61 accommodated in the drum base 42 and protruding from the upper portion of the water flow forming body 61 and radially radially from the water flow forming body. It may include a stirring blade (62) extended to, a pumping blade (63) protruding from the lower portion of the water flow forming body (61) to push the water of the drum base (42).

At this time, in order to induce stable rotation of the water flow forming part 6 and minimize interference with the drum base 42, the length of the stirring blade 62 and the pumping blade 63 is the water flow forming body 61 It may be provided smaller than the diameter of.

The water flow forming part 6 transmits mechanical force to the clothes accommodated in the drum 4 due to the stirring blade 62, or forms a water flow in the drum body 41 to improve cleaning power. do.

In addition, the water flow forming part 6 may play a role of circulating water in the drum 4 by introducing water contained in the drum 4 into the flow path part 44 due to the pumping blade 63. have.

The water flow forming part 6 can be rotated by a driving part 9, the driving part 9 being fixed to the outside of the tub body 31 to generate a rotating magnetic field, the stator 911, and the stator ( It may include a rotor 913 that rotates by a rotating magnetic field of 911, a rotating shaft 914 that penetrates the bottom surface of the tub body 31 and connects the water flow forming part 6 and the rotor 913. have.

When the water flow forming part 6 rotates by the driving part 9, the water stored in the drum 4 may move along the rotational direction of the stirring blade 62 and the pumping blade 63.

At this time, since the water flow forming part 6 is provided on the drum base 42, the driving part 9 is preferably provided at the lower end of the tub 3.

On the other hand, the drum 4 is provided on the outer wall of the drum 4 and guides the water flowing out of the drum 4 by the water flow forming unit 6 to the flow path 44. ) May be further included.

That is, the drum 4 and the flow path part 44 may be communicated with each other by the guide part 5.

3 is a block diagram showing the configuration of the laundry treatment apparatus of the present invention.

In the laundry treatment apparatus 100 of the present invention, the driving unit 9 is controlled by the control operation of the control unit P, and the driving unit 9 can rotate the drum 4.

The control unit P operates by receiving an operation signal or a control command from the input unit 14a. The input unit 14a may be provided with a washing course and an option selection unit for performing a washing, rinsing, and spin-drying process. Accordingly, washing, rinsing, and spin-drying processes may be performed. In addition, the control unit P may control to display a washing course, a washing time, a spinning time, a rinsing time, or the like, or a current operating state through the display unit 14b.

Meanwhile, the control unit P controls the driving unit 9 to not only rotate the drum 4 but also control the rotation speed of the drum 4. The control unit P may include a current detection unit 225 for detecting an output current flowing through the driving unit 9. Accordingly, the driving state of the driving unit 9 can be checked based on the current value sensed through the current detection unit 225, and further, the load acting on the driving unit 9 can be calculated. In addition, the control unit P may calculate a load of the driving unit 9 based on a current value applied to drive the driving unit 9.

Meanwhile, the control unit P may control the driving unit 9 based on the position detection unit 220 that detects the position of the driving unit 230.

The current detected by the driving unit 9 and the detected position signal are input again to the control unit P, and feedback is received based on the current detected by the driving unit 9, so that the control unit P may control the driving unit 9.

Meanwhile, in the laundry treatment apparatus of the present invention, the position detection unit 235 may be omitted, and a separate algorithm may be implemented to detect the position of the driving unit 9. (Aka, sensorless driving unit) The control unit P may measure the current or voltage output from the driving unit 9 and detect the position of the rotor or stator in the driving unit 9.

Figure 4 shows an embodiment of the control method of the laundry treatment apparatus of the present invention utilizing the above-described structure, Figure 5 is the RPM of the drum when the spin-drying stroke is performed when a short circuit does not occur in the laundry treatment device of the present invention. Is shown.

4 and 5, the laundry treatment apparatus of the present invention controls the water supply unit 21 to supply water to the tub 3 when an arbitrary course or option for washing clothes is performed ( T1) and the drum rotation step (T2) of rotating the drum by controlling the driving unit 9 may be performed.

The laundry treatment apparatus of the present invention may sense the amount of dry cloth by the driving unit 9 before the water supply step T1, calculate water corresponding thereto, and supply water to the tub 3.

The drum rotation step S2 is a step of applying a mechanical force to the clothing by rotating the drum 4 in one direction or in both directions, and may correspond to at least one of a washing stroke or a rinsing stroke. In the drum rotation step (S2), the drum 4 may rotate in one direction or in both directions at a set speed, and the set speed may correspond to a speed less than a resonance speed at which the tub or drum excessively vibrates. As a result, the washing or rinsing may be performed without generating resonance vibration in the laundry treatment apparatus.

In the laundry treatment apparatus of the present invention, when the drum rotation step (T2) is finished, the drum is rotated at high speed to perform a dehydration process to remove moisture from the clothes. The dehydration process may correspond to washing dehydration in which the washing process is finished and foreign substances and water are discharged from the clothing, or may correspond to a rinsing dehydration in which water is discharged from the clothes after the rinsing process is finished. In addition, the dehydration cycle may correspond to main dehydration in which the rinsing cycle is completely ended and water is finally discharged.

The dehydration process includes a process of rotating the drum at a faster speed than the drum rotating step (T2). Accordingly, in the dehydration stroke, the drum 4 passes through a resonance speed that generates resonance of the laundry treatment apparatus, and thus the state of the clothes or the amount of wetness can act as an important factor.

For example, when clothes are twisted or lumped in the drum 4, there is no problem in the drum rotation step T2, but excessive vibration may occur in the dehydration stroke. In addition, if there is an excessive amount of clothing in the drum 4, there is no problem in the drum rotation step (T2), but in the spin-drying stroke, the drive unit 9 is rapidly accelerated or rotated at high speed. ) Can cause excessive load.

Accordingly, in the laundry treatment apparatus of the present invention, when the drum rotation step T2 is completed, the tub 3 may enter the dehydration cycle while water is present. In other words, the laundry treatment apparatus of the present invention can rotate or accelerate the drum 4 in the state in which the tub 3 has water, and can selectively drive the drain 22. (Aka, residual water dehydration) As a result, the drum 4 is rotated while the tub 3 has water inside, thereby eliminating twisting or agglomeration of the clothing, thereby reducing the degree of unbalance. In addition, the drum 4 can pass through a resonance region or a resonance speed in a state in which water is present in the tub 3, so that the vibration width may be reduced.

In addition, the laundry treatment apparatus of the present invention detects the amount of wetness and calculates the corresponding drum rotation speed by detecting the amount of wetness when the water in the tub 3 is completely drained while the drum is rotating, or by determining an allowable reference value for unbalance to perform the dehydration process. Can be done. Therefore, the rotation of the drum 4 may not be stopped in all processes after the drum rotation step T2. Accordingly, since moisture from the clothes can be discharged and removed during the entire dehydration cycle, the operating time of the clothes treatment apparatus can be greatly saved.

Specifically, the laundry treatment apparatus of the present invention may perform a cloth dispersing step T3 of dispersing fabric by rotating the drum 4 at a low speed when the drum rotating step T2 is finished. In the foam dispersing step T3, it may be a step of rotating the drum at a first speed that is lower than the set speed of the drum rotating step T2. In the foam dispersing step (T3), the drum may be rotated in one direction or the drum may be rotated in both directions. Since the foam dispersing step T3 is performed in a state in which water is accommodated in the tub 3, even if the clothes are lumped or twisted in the drum rotating step T2, the unbalance can be resolved.

In the foam dispersion step T3, the drum may be accelerated to the first speed and then the rotational speed of the drum may be maintained at the first speed for a predetermined time. Since the set speed is lower than the resonance speed, the first speed may also be lower than the resonance speed.

The laundry treatment apparatus of the present invention may perform an acceleration pass step T4 of accelerating the drum to a second speed when the cloth dispersing step T3 is completed. The second speed may correspond to a natural frequency of the laundry treatment apparatus or a speed higher than a resonance speed that generates resonance vibration. Accordingly, the acceleration passing step T4 can be regarded as a step of passing the resonance velocity.

Meanwhile, the drain 22 may be in a state in which driving is stopped until the acceleration passing step T4 is finished. That is, the tub 3 may be in a state in which water is received as it is, and the tub 3 may be in a section in which the state in which water is received is maintained. As a result, since the acceleration passing step (T4) passes through the resonance speed in a state in which water is present in the tub 3, the vibration width may be greatly reduced due to the weight of the water in the tub 3 even if the resonance vibration occurs. . Accordingly, the laundry treatment apparatus according to the present invention can prevent excessive vibration or short-circuit from occurring during the dehydration stroke. On the other hand, the short circuit prevents the cabinet (1) and the tub (3) from colliding with the tub (3) or from falling over when the tub (3) or the drum (4) vibrates excessively during the dehydration stroke. In order to do so, it may mean that the dehydration process is stopped.

When the rotational speed of the drum reaches the second speed in the acceleration passing step (T4), a drainage rotation step (T6) of operating the drainage part 22 while maintaining the speed of the drum at the second speed may be performed. have.

In the drainage rotation step T6, the drainage part 22 may be driven as soon as the drum rotation speed reaches the second speed.

However, the drain portion 22 may be driven after a certain period of time after the drum rotation speed reaches the second speed. For example, 7 seconds after the drum rotational speed reaches the second speed, the drain 22 may start draining the water from the tub 3. Accordingly, after the state of the inside of the tub 3 is stabilized, the water in the tub 3 may be drained.

The drainage rotation step T6 may drive the drainage pump 221 while rotating the drum. That is, as the water of the tub 3 is drained, the drum 4 may be continuously rotated. Accordingly, the drainage rotation step T6 can be regarded as a step in which residual water dehydration is performed in earnest.

In the drain rotation step T6, the drum is rotated at a speed equal to or higher than the resonance speed. Therefore, in the drain rotation step T6, vibration due to a resonance phenomenon may not occur. Furthermore, since the second speed is greater than or equal to the resonance speed, some water in the clothing may escape to the outside of the drum 4. That is, in the drainage rotation step T6, water contained in the clothing may be separated or removed from the clothing while the water in the tub 3 is drained. In other words, in the drainage rotation step (T6), the clothes may be dehydrated, and the duration of the spin-drying stroke may be reduced.

In addition, in the drainage rotation step (T6), the clothes may be in a floating state in the water until the water in the tub 3 is completely drained. Accordingly, even if the clothing is twisted or eccentric in the drum rotating step T2, the clothing may be unwound or the eccentricity may be eliminated in the drain rotating step T6.

As a result, the unbalance inside the drum 4 is largely eliminated due to the drainage rotation step T6, and dehydration may also proceed.

In addition, in the drain rotation step T6, the control unit P may detect whether an unbalanced condition or vibration inside the drum 4 exceeds a reference value. That is, the control unit P may check whether the degree of unbalance in the drum 4 exceeds the reference value while performing residual water dehydration through the drainage rotation step T6.

For example, the control unit P checks the current waveform applied or measured to the driving unit 9 over time or the period or amplitude of the vibration generated in the drum 4 to unbalance the inside of the drum 4 I can more effectively detect whether transient vibrations are occurring. In the drain rotation step (T6), since the speed of the drum is maintained at the second speed, the current applied or measured to the driving unit 9 and the vibration of the drum 4 will be changed only by the self-weight and unbalance of the clothing. to be.

On the other hand, the drainage rotation step (T6) may be continued even if the water in the tub (3) is drained. That is, even if the water level inside the tub 3 is lower than the bottom level of the drum 4 or the bottom level of the tub 3, the drainage rotation step T6 may be continued.

This is because the drum rotates at the second speed in the drain rotation step T6, so that the water contained in the clothes can be continuously discharged. In addition, this is because it is necessary to detect an unbalanced state of the clothing while the water in the tub 3 is drained in the drainage rotation step T6. Therefore, the duration of the drainage rotation step T6 may be longer than the duration of the cloth dispersion step T3. That is, the time for the drum 4 to rotate at the second speed may be much longer than the time for the drum 4 to rotate at the first speed.

For example, the duration of the drainage rotation step T6 may be twice or more than the duration of the cloth dispersion step T3.

In addition, when the drainage rotation step T6 is performed, the control unit P may perform a drainage completion detection step T8 of checking whether drainage is completed. In the drainage rotation step (T6) or the drainage completion detection step (T8), the meaning of "the water in the tub 3 has been drained" or "the water in the tub 3 has been drained" means the tub 3 ) May not correspond to the absence of water. This is because moisture contained in the clothing may be continuously discharged to the tub 3 even if the water level of the tub 3 is lower than the bottom surface of the tub in the drainage rotation step T6. In addition, this is because the amount of moisture contained in the drum 4 can be measured unless the clothing of the drum 4 is exposed to the water contained in the tub 3.

Therefore, the meaning that the drainage is completed or the drainage is performed in the drainage rotation step (T6) means that the water level of the tub 3 is lower than the bottom surface of the drum 4, the bottom surface of the tub 3, or the The water contained in the tub 3 may correspond to any one of the water levels not in contact with the clothing.

Accordingly, the laundry treatment apparatus of the present invention further includes a drainage completion detection step of detecting that water from the tub is drained during the drainage rotation step (T6), and the water in the tub 3 in the drainage completion detection step Even if it is accommodated, when detecting that the water level of the tub 3 is lower than the bottom surface of the drum, the control unit P may determine that the water in the tub has been drained.

In addition, even if water is accommodated in the tub, at least one of the water level of the tub 3 is less than a certain level, the load of the drain 22 is less than a certain load, and the load of the driving unit 9 is less than a certain load. When detecting that there is one, the control unit P may determine that the water in the tub has been drained.

In addition, when the waveform of the current applied or sensed to the driving unit 9 is detected within a certain range or forms a certain period, the control unit P may determine that the water of the tub has been drained.

In addition, when detecting that the clothing is separated from or separated from the water contained in the tub 3, the controller P may determine that the water in the tub has been drained.

As a result, in the drainage completion detection step (T8), the water level of the tub 3 is lower than the bottom surface of the drum 4, the bottom surface of the tub 3, or water contained in the tub 3 This may be a step of detecting any one of the water levels not in contact with the clothing. Of course, the drainage completion may be determined by detecting that the drainage pump 221 of the drainage part 22 no longer detects the load of water in the drainage completion detection step T8.

The control unit P may check whether the drain of the tub 3 is completed considering that the load value added to the driving unit 9 is constant over time or the vibration period is constant. In addition, the control unit p may detect whether drainage of the tub 3 is completed through a water level sensor.

Specifically, in the drainage completion detection step (T8), the control unit P determines that the water level of the tub 3 is lower than the bottom surface of the drum 4 or lower than the bottom surface of the tub 3 through the current value. Or, it is possible to detect whether the drainage is complete by detecting any one of the water level at which the water contained in the tub 3 does not contact the clothing.

The control unit P may detect whether the drainage part 22 is complete by detecting that the water load of the tub is not detected by the drain part 22 or that the power applied to the drain part 22 decreases rapidly.

In addition, the control unit P may detect whether the drainage is complete as the current value applied or measured to the driving unit 9 suddenly changes significantly or enters a predetermined range. This is because if the drum 4 is not in contact with water, the frictional force or load will decrease sharply than before.

In addition, the control unit P may detect whether the drainage is complete by forming a constant period or a constant waveform of the current value applied or measured to the driving unit 9. This is because the weight or eccentricity of the clothing affects the rotation of the drum 4, so that the waveform of the current will show regularity according to the rotation period of the drum 4.

In addition, in the drainage completion detection step (T8), the control unit P uses a water level sensor so that the water level of the tub 3 is lower than the bottom surface of the drum 4 or the tub 3 ), or the water level at which the water contained in the tub 3 does not contact the clothes.

For example, when the water level of the tub 3 falls below a reference value or falls within a certain range, the control unit P may detect that the drainage is complete.

Of course, the control unit P may determine that the water in the tub is drained when all of the water in the tub 3 is completely drained.

When the control unit P detects that the drainage is completed in the drainage rotation step T6, the cloth amount detection step T9 of detecting the cloth amount of the drum 4 may be performed. The cloth amount sensing step T9 may detect the cloth amount of the clothes through a current value added to or detected by the driving unit 9 while performing acceleration and deceleration of the drum. The amount of cloth corresponds to the amount of wet or dehydrated cloth. That is, the amount of cloth detected in the cloth amount detecting step T9 corresponds to the reference amount of cloth for performing the dehydration stroke in earnest. The control unit P may set an allowable reference value of the degree of unbalance in a subsequent main dehydration step based on the amount of cloth detected in the cloth amount detecting step T9. In addition, the control unit P may set an allowable vibration value of the tub 3 or the drum 4 based on the amount of moisture set in the cloth amount sensing step T9.

In addition, the cloth amount sensing step (T9) is performed in a state in which water from the tub is drained. For example, it may be performed in a state in which the clothing does not come into contact with water contained in the tub 3. Accordingly, the laundry treatment apparatus of the present invention can accurately detect the amount of wetness while performing residual water dehydration.

Furthermore, the drum continues to be maintained at a second speed higher than the resonance speed until the laundry weight detection step T9 is performed, and the drum rotates in the laundry weight detection step T9. In other words, since the rotation of the drum is not stopped in order to perform the packing amount sensing step T9, the dehydration effect can be continuously derived. Accordingly, the control method of the laundry treatment apparatus according to the present invention has the advantage of saving dehydration time by promoting a dehydration effect even in the process of detecting the amount of wet cloth.

On the other hand, when the cloth amount detecting step T9 is finished, the laundry treatment apparatus of the present invention may perform a dehydration speed step T10 of accelerating the drum to a fourth speed higher than the third speed. The dehydration speed step T10 corresponds to a step of accelerating the drum 4 to a dehydration speed at which clothing can be finally dewatered. The acceleration of the drum in the dehydration speed step T10 may be determined by the control unit p according to the amount of cloth detected in the cloth amount detecting step T9.

When the drum reaches the fourth speed in the dehydration speed step T10, a high-speed rotation step T11 of maintaining the speed of the drum 4 at the fourth speed may be performed. The high-speed rotation step (T11) may be viewed as a main dehydration step in which moisture from the clothing is removed in earnest. The duration of the high-speed rotation step T11 may be set by the control unit P according to the amount of cloth detected in the amount sensing step T9.

Accordingly, the laundry treatment apparatus of the present invention has the advantage of preventing excessive vibration while performing residual water dehydration and effectively eliminating the eccentricity of the clothes.

In addition, while performing residual dehydration, it is possible to set an allowable reference value or an allowable vibration value of unbalance by detecting the amount of dehydration. Accordingly, an optimum dehydration stroke can be performed by varying the allowable dehydration value according to the amount of cloth, and unnecessary short circuits can be prevented.

On the other hand, the control unit P of the present invention may detect the amount of cloth based on the current applied to the driving unit 9 or the current measured by the driving unit 9 to accelerate and decelerate the drum in the cloth amount sensing step T9.

Hereinafter, a structure and a specific method in which the control unit P can perform the packing amount sensing step T9 with the driving unit 9 will be described.

Fig. 6 shows a structure in which the driving unit 9 is controlled by the control unit P.

The control unit P includes an inverter 420 and an inverter control unit 430 to control the driving unit 9, a converter 410 for supplying DC power input to the inverter 420, and a DC terminal voltage detection unit B , A smoothing capacitor (C), and a current detection unit 225, an input current detection unit (A), a reactor (L), and the like may be further included.

6 shows that the current detection unit 225 is provided as an output current detection unit (E). Of course, the current detection unit 225 may be a device separately connected to the control unit p.

When the inverter control unit 430 outputs a pulse width modulation (PWM) switching control signal Sic to the inverter 420, the inverter 420 performs a high-speed switching operation to supply AC power of a predetermined frequency to the driving unit 9 ) Can be supplied.

The reactor L is disposed between the commercial AC power source 405 (vs) and the converter 410, and performs a power factor correction or boosting operation. In addition, the reactor L may perform a function of limiting harmonic current due to high-speed switching of the converter 410.

The input current detector A may detect an input current is input from the commercial AC power source 405. To this end, a CT (current trnasformer), a shunt resistor, or the like may be used as the input current detection unit A. The detected input current is may be input to the inverter controller 430 as a discrete signal in the form of a pulse.

The converter 410 converts the commercial AC power (vs, 405) that has passed through the reactor L into DC power and outputs it. In the drawings, the commercial AC power source 405 is shown as a single-phase AC power source, but may be a three-phase AC power source. The internal structure of the converter 410 also varies according to the type of the commercial AC power source 405.

Meanwhile, the converter 410 may be formed of a diode or the like without a switching element to perform a rectification operation without a separate switching operation. For example, in the case of single-phase AC power, four diodes can be used in the form of a bridge. In addition, in the case of a three-phase AC power source, six diodes may be used in the form of a bridge. As the converter 410, a half-bridge type converter in which two switching elements and four diodes are connected may be used. In the case of a three-phase AC power source, the converter 410 may use 6 switching elements and 6 diodes. When the converter 410 includes a switching element, a step-up operation, power factor improvement, and DC power conversion may be performed by a switching operation of the switching element.

The smoothing capacitor C may be provided to smooth and store the input power. A plurality of smoothing capacitors C may be provided to ensure device stability. Meanwhile, since DC power is stored at both ends of the smoothing capacitor C, it may be referred to as a DC terminal or a DC link terminal.

The DC terminal voltage detector B may detect the DC terminal voltage Vdc that is both ends of the smoothing capacitor C. To this end, the DC terminal voltage detector B may include a resistance element, an amplifier, or the like. The detected DC terminal voltage Vdc may be input to the inverter controller 430 as a discrete signal in the form of a pulse.

The inverter 420 may include a plurality of inverter switching elements. The inverter 420 may convert a DC power (Vdc) smoothed by an on/off operation of the switching element into a three-phase AC power source (va, vb, vc) having a predetermined frequency. The inverter 420 is a pair of upper arm switching elements (Sa, Sb, Sc) and lower arm switching elements (S'a, S'b, S'c) connected in series with each other, and a total of three pairs of upper and lower arm The switching elements may be connected to each other in parallel (Sa&S'a,Sb&S'b,Sc&S'c). Diodes are connected in reverse parallel to each of the switching elements Sa, S'a, Sb, S'b, Sc, and S'c.

The switching elements in the inverter 420 perform on/off operations of each switching element based on the inverter switching control signal Sic from the inverter controller 430. Thereby, the three-phase AC power having a predetermined frequency is output to the drive unit 9.

The inverter controller 430 may control a switching operation of the inverter 420. To this end, the inverter control unit 430 may receive an output current io detected by the output current detection unit E.

The inverter controller 430 outputs an inverter switching control signal Sic to the inverter 420 in order to control the switching operation of the inverter 420. The inverter switching control signal Sic is a switching control signal of the pulse width modulation method (PWM), and is generated and output based on the output current value io detected from the output current detection unit E.

Figure 7 shows an embodiment of the inverter control unit 430 of the present invention.

The inverter control unit 430 includes an axis conversion unit 510, a speed calculation unit 520, a current command generation unit 530, a voltage command generation unit 540, an axis conversion unit 550, and a switching control signal output unit ( 560) may be included.

The output current detection unit E detects an output current io flowing between the inverter 420 and the three-phase driving unit 9. That is, the current flowing through the drive unit 9 is detected.

The output current detection unit E may detect all of the output currents ia, ib, ic of each phase, or may detect the output currents of two phases using three-phase balance.

The output current detection unit E may be located between the inverter 420 and the driving unit 9, and a current transformer (CT) or a shunt resistor may be used to detect the current. When the shunt resistor is used, three shunt resistors are located between the inverter 420 and the driver 9, or the three lower arm switching elements (S'a, S'b, S'c) of the inverter 420 ) Can be connected to each end. It is also possible to use two shunt resistors using three-phase equilibrium. In addition, when one shunt resistor is used, the shunt resistor may be disposed between the capacitor C and the inverter 420 described above.

The detected output current io is a discrete signal in the form of a pulse and may be applied to the inverter controller 430. An inverter switching control signal Sic may be generated based on the detected output current io.

Hereinafter, it is assumed that the detected output current io is the three-phase output current ia, ib, ic.

On the other hand, the three-phase drive unit 9 is applied to each phase AC power of a predetermined frequency to the stator of each phase (a, b, c phase), the rotor rotates. Such a driving unit 9 is a surface-mounted permanent-magnet synchronous motor (SMPMSM), an interior permanent magnet synchronous motor (IPMSM), and a synchronous reluctance motor (Synchronous Motor). Reluctance Motor; Synrm) may be provided. Among them, SMPMSM and IPMSM are Permanent Magnet Synchronous Motor (PMSM), and Synrm is characterized by no permanent magnet.

Meanwhile, when the converter 410 includes a switch element, the inverter controller 430 may control a switching operation of the switching element in the converter 410. To this end, the inverter controller 430 may receive an input current is detected by the input current detection unit A. In addition, the inverter controller 430 may output a converter switching control signal Scc to the converter 410 in order to control the switching operation of the converter 410. The converter switching control signal Scc is a pulse width modulation (PWM) type switching control signal, and may be generated and output based on the input current is detected from the input current detector A.

Meanwhile, the position sensing unit 235 may detect the rotor position of the driving unit 9. To this end, the position detection unit 235 may include a Hall sensor. The detected rotor position H is input to the inverter control unit 430 and may be used as a basis for speed calculation. .

The axis conversion unit 510 receives the three-phase output current (ia, ib, ic) detected by the output current detector (E) and converts it into two-phase currents (iα, iβ) of the stationary coordinate system. The axis conversion unit 510 may convert the two-phase currents iα and iβ of the stationary coordinate system into the two-phase currents id and iq of the rotational coordinate system.

The speed calculating unit 520 may calculate a speed based on the position signal H of the rotor input from the position detecting unit 235. That is, based on the position signal, it is possible to calculate the speed by dividing it over time. The speed calculator 520 may output a calculated position and a calculated speed based on the input position signal H of the rotor.

)와 속도 지령치(ω*r)에 기초하여, 전류 지령치(i*q)를 생성한 다. 예를 들어, 전류 지령 생성부(530)는, 연산 속도(

)와 속도 지령치(ω*r)의 차이에 기초하여, PI 제어기(535)에서 PI 제어를 수행하며, 전류 지령치(iq)를 생성할 수 있다. 도면에서는, 전류 지령치로, q축 전류 지령치(i*q)를 예시하나, 도면과 달리, d축 전류 지령치(i*d)를 함께 생성하는 것도 가능하다. 한편, d축 전류 지령치(i*d)의 값은 0으로 설정될 수도 있다.The current command generation unit 530, the calculation speed (

) And the speed command value (ω*r), the current command value (i*q) is generated. For example, the current command generation unit 530, the calculation speed (

) And the speed command value (ω*r), the PI controller 535 performs PI control, and the current command value iq can be generated. In the drawing, the q-axis current command value (i*q) is illustrated as the current command value, but unlike the drawing, it is also possible to generate the d-axis current command value (i*d) together. Meanwhile, the value of the d-axis current command value (i*d) may be set to 0.

Meanwhile, the current command generation unit 530 may further include a limiter (not shown) that restricts the current command value i*q from exceeding an allowable range. The voltage command generation unit 520 includes d-axis and q-axis currents (id, iq) that have been axially transformed from the axis conversion unit into a two-phase rotational coordinate system, and current command values (i*d,i) in the current command generation unit 530, etc. Based on *q), the d-axis and q-axis voltage command values (v*d,v*q) can be generated.

For example, the voltage command generation unit 530 performs PI control in the PI controller 544 based on the difference between the q-axis current (iq) and the q-axis current command value (i*q), and The voltage command value (v*q) can be generated. Also, the voltage command generation unit 530 performs PI control in the PI controller 548 based on the difference between the d-axis current (id) and the d-axis current command value (i*d), and the d-axis voltage command value (v*d) can be created. Meanwhile, the value of the d-axis voltage command value v*d may be set to 0, corresponding to the case where the value of the d-axis current command value i*d is set to 0.

Meanwhile, the voltage command generation unit 530 may further include a limiter (not shown) that limits the level of the d-axis and q-axis voltage command values (v*d,v*q) to not exceed the allowable range. .

Meanwhile, the generated d-axis and q-axis voltage command values (v*d,v*q) are input to the axis conversion unit 550.

)와, d축, q축 전압 지령치(v*d,v*q)를 입력받아, 축변환을 수행한다. 먼저, 축변환부(550)는 2상 회전 좌표계에서 2상 정지 좌표계로 변환을 수행한다. 때, 속도 연산부(520)에서 연산된 위치(

)가 사용될 수 있다. 그리고, 축변환부(550)는, 2상 정지 좌표계에서 3상 정지 좌표계로 변환을 수행한다. 이러한 변환을 통해, 축변환부(1050)는, 3상 출력 전압 지령치(v*a,v*b,v*c)를 출력하게 된다.The axis conversion unit 550 is a position calculated by the speed calculation unit 520 (

) And the d-axis and q-axis voltage command values (v*d,v*q) are received, and axis conversion is performed. First, the axis conversion unit 550 converts from a two-phase rotation coordinate system to a two-phase stationary coordinate system. When, the position calculated by the speed calculating unit 520 (

) Can be used. In addition, the axis conversion unit 550 converts from a two-phase stationary coordinate system to a three-phase stationary coordinate system. Through this conversion, the axis conversion unit 1050 outputs a three-phase output voltage command value (v*a, v*b, v*c).

The switching control signal output unit 560 generates a switching control signal Sic for an inverter according to a pulse width modulation (PWM) method based on a three-phase output voltage command value (v*a,v*b,v*c). And print it out.

The output inverter switching control signal Sic may be converted into a gate driving signal by a gate driver (not shown) and may be input to the gate of each switching element in the inverter 420. Accordingly, the switching elements Sa, S'a, Sb, S'b, Sc, S'c in the inverter 420 perform a switching operation.

Meanwhile, the switching control signal output unit 560 may generate and output an inverter switching control signal Sic in which a two-phase pulse width modulation method and a three-phase pulse width modulation method are mixed in relation to an embodiment of the present invention. . For example, in the acceleration rotation section described later, an inverter switching control signal (Sic) is generated and output using a three-phase pulse width modulation method, and in order to detect back EMF in a constant-speed rotation period, an inverter using a two-phase pulse width modulation method. A switching control signal Sic can be generated and output.

The laundry treatment apparatus according to the present invention can perform washing, rinsing, and spin-drying while rotating the drum by controlling the driving unit 9 based on the above-described circuit structure.

In addition, at the same time, a current applied to the driving unit 9 or a current measured by the driving unit 9 may be sensed to detect a cloth amount (dry cloth amount or wet cloth amount). It can be checked whether any one of washing, rinsing, and spin-drying can be performed based on the detected amount of cloth. In addition, it is also possible to set an acceptable unbalance reference value when performing any one of washing, rinsing, and spin-drying strokes based on the detected amount of cloth.

Fig. 8 shows that the laundry is performed in the laundry detection step T9 based on the above structure.

The laundry weight detection step (T9) of the laundry treatment apparatus of the present invention includes a laundry weight acceleration step (T91) of accelerating the drum 4 from a second speed to the third speed, and decelerating the drum 4 at a third speed. The laundry weight reduction step (T93) and a laundry weight detection step (T94) of detecting the amount of clothes accommodated in the drum through an acceleration measurement value of the driving unit 9 during the acceleration step and a deceleration measurement value of the driving unit during the deceleration step. ) Can be performed.

That is, the laundry treatment apparatus of the present invention senses an acceleration measurement value measured by the driving unit 9 or applied to the driving unit 9 while accelerating the driving unit 9, and decelerating the driving unit 9 while the driving unit ( A deceleration measurement value measured in 9) or applied to the drive unit 9 is sensed. Thereafter, the acceleration measurement value and the deceleration measurement value are calculated to detect the amount of clothing accommodated in the drum 4.

The acceleration measurement value and the deceleration measurement value may be a command value applied to the driving unit 9 while driving the driving unit 9, and may be measured values measured by the driving unit 9 while driving the driving unit 9 have. For example, the command value may be a current command value or a voltage command value derived from the PI controller 535 applied to drive the driving unit 9, and the measured value may be the position sensing unit 235 or the current It may be a current value or a voltage value of the driving unit 9 measured by the sensing unit 225 itself.

Accordingly, in the laundry treatment apparatus of the present invention, the step of actively maintaining the driving unit 9 at a constant speed in order to detect the amount of cloth may be omitted. Therefore, it is possible not only to save energy required to maintain the driving unit 9 at a constant speed, but also to ignore the frictional force factor that must be overcome to maintain the driving unit 9 at a constant speed in the process of calculating the amount of cloth. .

When the control unit P uses the command value when detecting the amount of cloth, it may not be necessary to feed back the actual situation to the driving unit 9, and the actual driving of the driving unit 9 You may not consider the situation. Therefore, the process of calculating the cloth value may be faster. In addition, since the above formula can be relatively simple, the cloth amount value can be calculated quickly.

The acceleration measurement value may include an acceleration current value Iq_ACC measured by the driver 9, and the deceleration measurement value may include a deceleration current value Iq_DEC measured by the driver 9. Specifically, the acceleration current value includes a current command value (Iq*_ACC) for rotating the driving unit during the acceleration step, and the deceleration current value is a current command value value (Iq) for rotating the driving unit during the deceleration step. *_DEC) can be included.

On the other hand, when the control unit P detects the amount of cloth, when the measured value output to the driving unit 9 is used, the actual situation is reflected in the driving unit 9, so that the cloth amount value is accurately measured. There is an advantage that you can get it. In addition, the command value occurs only when the driving unit 9 is driven or when power is applied and actively controlled. Therefore, the use of the measured value has the advantage that data for detecting the amount of fabric can be obtained even when the power to the driving unit 9 is cut off or the driving unit 9 is not actively controlled.

In the laundry treatment apparatus of the present invention, the driving unit 9 may be decelerated using a spare braking method or the like by cutting off power in the laundry weight reduction step T93. Accordingly, it is possible to omit the algorithm for controlling the laundry weight reduction step T93 and save energy for the laundry weight reduction step T93.

Further, since the power is cut off in the deceleration step (II), the voltage command value may be O. Therefore, the present invention can detect the amount of fabric by calculating only the current except the voltage.

That is, in the control method of the laundry treatment apparatus of the present invention, the voltage command value or the voltage value itself can be ignored or not used, and since only the current value is used, an arithmetic expression for detecting the amount of laundry can be provided very simply. Since the calculation formula is simplified, the calculation can be made quickly and accurately, and the amount of cloth can be accurately detected.

Specifically, data and algorithms for calculating the acceleration measurement value and the deceleration measurement value (hereinafter, an equation) may be stored in the controller P. The formula may be provided so as not to use a voltage value from the beginning. For this reason, since it is not necessary to calculate the back electromotive force, the present invention can omit the step of maintaining the driving unit 9 at a constant speed.

The calculation formula of the present invention may be provided as follows.

Weight value of the present invention (inertia, Jm, Load_data)

Can be calculated in the following way. The P and Ke are constant values of the drive unit 9 and can be measured by the control unit P, and the denominator corresponds to the difference between the speed change amount in the acceleration step and the speed change amount in the deceleration step.

The amount of change in speed may be measured by the control unit P due to the position sensing unit 235, calculated by measuring a time reached until acceleration or deceleration, or measured immediately by measuring a current.

Accordingly, in the present invention, the laundry weight value can be calculated immediately by measuring the acceleration output current value (Iq_ACC) when accelerating the drive unit 9 and the acceleration output current value (Iq_DEC) when decelerating. That is, the acceleration current value includes an acceleration output current value (Iq_ACC) output from the driving unit during the acceleration step, and the deceleration current value includes a deceleration output current value (Iq_DEC) output from the driving unit during the deceleration step. It can be said that it is.

Further, the acceleration output current value may be applied to an average value (Iqe_ACC) of the current values measured by the driving unit during the laundry weight acceleration step (T91), and the deceleration output current value is determined by the driving unit during the laundry weight reduction step (T93). The average value (Iqe_DEC) of the measured current values can be applied.

In either case, the cloth amount can be calculated with only one factor of the current value, and since the voltage value factor can be omitted, the cloth amount calculation can be simplified, and the speed and accuracy of the cloth value can be improved. Therefore, even if the time of the fabric weight acceleration step T91 is very short or the time of the fabric weight reduction step T93 is very short, the amount of fabric can be accurately detected, and thus the time required for detecting the fabric weight itself can be further reduced.

On the other hand, in the laundry weight sensing step T9 of the laundry treatment apparatus of the present invention, the drum 4 or the driving unit 9 is accelerated and then decelerated immediately to measure the laundry weight. Therefore, the time itself for measuring the amount of fabric is very short, and the clothes inside the drum 4 cannot move or flow during this time. Therefore, since the cloth amount can be detected in a short time in which the state of the clothing does not change, the accuracy of the cloth amount calculation may be further increased.

On the other hand, the calculation formula applied to the cloth weight detection of the present invention uses the difference between the current value of the cloth weight acceleration step T91 and the current value of the cloth weight reduction step T93. Accordingly, the frictional force of the driving unit in the bagging acceleration step T91 and the frictional force of the driving unit in the bagging reduction step T93 are equal to each other, so that the current compensation equation considering the frictional force cancels each other. Therefore, since it is not necessary to consider the friction force of the driving unit 9 in the laundry amount sensing step T9 of the laundry treatment apparatus of the present invention, a process of correcting or tuning the friction force may be omitted.

In addition, since the cloth amount detecting step (T9) of the laundry treatment apparatus of the present invention does not use a voltage value, a process of compensating or tuning an error in the voltage value can be omitted, and the constant velocity process is omitted. ), you can omit the process of compensating for the friction force or tuning. As a result, in the laundry amount detecting step T9 of the laundry treatment apparatus of the present invention, the laundry amount is derived immediately after the current value is substituted, and since there is no procedure for compensating or tuning the laundry amount, the laundry volume can be detected very quickly and accurately.

Accordingly, it is possible to reduce the amount of load required for the control unit P, to replace the control unit P with a relatively simple configuration, or to utilize the performance of the control unit P in other ways.

On the other hand, as can be seen from the above equation, the acceleration measurement value may further include a speed change amount in the acceleration step, and the deceleration measurement value may further include a speed change amount in the deceleration step. The amount of change in the speed of the fabric acceleration step (T91) and the amount of change in the speed of the fabric weight deceleration step (T93) are only necessary to obtain the difference between the inertia of the acceleration step and the inertia of the deceleration step. It may not, and furthermore, no compensation or tuning process is required.

In more detail, the formula is derived by the following formula.

At this time, since the cloth amount is calculated through the difference between the acceleration inertia and the deceleration inertia, the amount of change in the speed is required.

Therefore, when the acceleration measurement value and the deceleration measurement value are measured in the same RPM section of the drum, the calculation can be made simpler because the width of the speed change is the same. That is, it is preferable that the laundry weight acceleration step (T91) and the laundry weight reduction step (T93) share the same speed band.

On the other hand, the laundry weight detection step (T9) of the laundry treatment apparatus of the present invention uses the current command value or the current value measured by the driving unit 9 by performing the laundry weight acceleration step T91 and the laundry weight reduction step T93. Detect the amount of cloth. In this case, since the above calculation formula uses a current value, the fabric weight reduction step T93 is first performed, and the fabric weight acceleration step T91 is performed to measure the current value to detect the fabric weight.

However, if the fabric weight acceleration step T91 is performed while performing the fabric weight reduction step T93, a current peak may occur because a sudden current for accelerating the driving unit 9 is introduced. When the current peak occurs, an instantaneous excessive load is generated on the control unit P, and a circuit in which the control unit P and the driving unit 9 are provided may be damaged. In addition, in order to prevent damage to the control unit P and the circuit, other materials may be used or a separate configuration may be added to improve durability of the control unit P or the circuit. Furthermore, after decelerating, the clothes inside the drum 4 may move in the process of accelerating, so that accurate measurement of the laundry weight may not be possible.

Therefore, it may be desirable to measure the amount of cloth by performing the cloth weight acceleration step T91 first, and then performing the cloth weight reduction step T93. Specifically, the laundry weight acceleration step T91 may accelerate the drum from a second speed to a third speed, and the laundry weight reduction step T93 may decelerate the drum at a third speed.

That is, the laundry weight acceleration step T91 and the laundry weight reduction step T93 may be performed continuously. In the laundry weight reduction step (T93), the current command value toward the driving unit 9 in the laundry weight acceleration step (T91) may be lowered or the voltage applied to the driving part 9 may be cut off. There is no fear of burnout.

In this case, the acceleration measurement value and the deceleration measurement value may be measured between the third speed and a second speed lower than the third speed. That is, by measuring the current value in the section band including the vertex in the speed graph, it is possible to detect the amount of cloth. This has the advantage of minimizing a situation in which an error may occur because the amount of fabric is detected by measuring the current value in a continuous situation.

Meanwhile, the acceleration measurement value and the deceleration measurement value are a first intermediate speed lower than the third speed , and the first intermediate speed higher than the second speed. lower It can be measured between the second intermediate speed . That is, although it is not a section including the vertex, the amount of cloth can be detected by measuring a current value in the same speed section band. This has the advantage of improving the accuracy of the fabrication calculation by measuring the stabilized current value because the speed change is the largest at the vertex.

On the other hand, the laundry weight detection step (T9) of the present invention may further include a laundry stopping step (T92) of stopping current supply to the driving unit between the laundry weight acceleration step and the laundry weight reduction step. That is, this is to prevent sudden changes in the driving unit 9, such as when the laundry weight reduction step T93 generates a back electromotive force in the driving unit 9.

Accordingly, the bagging stop step T92 may be performed in a spare braking, not a situation in which current is supplied to the driving unit 9, and may be a section in which the driving unit 9 acts like a generator. In the present invention, the laundry weight detection step T9 may more reliably obtain a current value for detecting the laundry weight in the laundry weight stopping step T92.

On the other hand, in the laundry weight reduction step T93, the drum may be decelerated at a sensing speed that is lower than the drum rotation speed at the start of the laundry weight acceleration step T91. That is, in the bag weight reduction step T93, the drum 4 is decelerated to a detection speed lower than the second speed, thereby obtaining a more accurate deceleration current value.

For example, in the case of making the weight of the reduced current value smaller in the process of calculating the deceleration current value and the acceleration current value, an accurate reduction if the measurement time of the reduced current value is lengthened or the reduction ratio is increased. The current value can be obtained. As a result, the control unit P may obtain a more accurate cloth weight value.

Meanwhile, the laundry treatment apparatus of the present invention can actively eliminate the unbalance when the unbalance value sensed in the acceleration pass step T4 or the drain rotation step T6 is greater than or equal to the reference value. If the unbalance is detected above the reference value in the acceleration pass step (T4) or the drain rotation step (T6), the possibility of a short circuit occurring in the dehydration speed (T10) or high speed rotation step (T11) is very high. This is to prevent.

Referring again to FIG. 6, since the acceleration passing step T4 passes through the resonance velocity or the resonance region, excessive vibration may occur, and a short circuit of the dehydration stroke may occur. The controller P may perform a first short-circuit detection step (T5) for detecting whether a short circuit of the dehydration stroke occurs in the acceleration pass step (T4).

When a short circuit is detected in the first short-circuit detection step T5, the controller P may immediately perform the cloth dispersion step T3 and perform the acceleration pass step T4 again. When the process is repeated N or more times, the control unit p may display an error indication on the display unit in which dehydration cannot be performed.

9 shows a case in which a short circuit occurs in the drain rotation step T5. This is only an example, and the same can be applied even when a short circuit occurs in the dehydration step T10.

When the acceleration pass step T4 passes by repeating the fore-distribution step T3, the control unit P causes a short circuit in the drain rotation step T6, the degree of unbalance exceeds the reference value, or the vibration is a set value. It is possible to perform a second short-circuit detection step (T7) to check whether or not to pass. The reference value and the set value may be previously stored in the control unit P.

When the unbalance value sensed in the drain rotation step T6 is greater than a reference value, the vibration value is greater than a set value, or a short circuit occurs, a safety deceleration step T71 of decelerating the drum may be performed.

In the safety deceleration step T71, the drum may be completely stopped, or the rotational speed of the drum 4 may be reduced to a region below the resonance speed.

When the safety reduction step T71 is performed, the laundry treatment apparatus of the present invention may immediately repeat the cloth dispersing step T3.

However, since the drainage has been performed to some extent in the drainage rotation step T5, there may be a margin for additional water supply to the tub 3. Accordingly, in the laundry treatment apparatus of the present invention, when the safety reduction step T71 is performed, the additional water supply step T72 of supplying water to the tub may be performed, and the cloth dispersing step T3 may be performed. Since the clothing floats in water in the additional water supply step T72, the unbalance can be actively resolved in the foam dispersing step T3.

Meanwhile, the laundry treatment apparatus of the present invention resolves unbalance of clothes in advance through the first short occurrence detection step and the second short occurrence detection step. Accordingly, the occurrence of a short circuit in the dehydration speed step T10 and the high speed rotation step T11 can be prevented in advance.

However, since there is a possibility that a short circuit may occur, the laundry treatment apparatus of the present invention resets an unbalanced reference value or an allowable vibration value based on the amount of wetness in the dehydration step (T10) and the high-speed rotation step (T11), so that the degree of unbalance is When the vibration value exceeds the reference value or the set value, the safety deceleration step T71 and the additional water supply step T72 may be performed, and the foam dispersion step T3 may be repeated.

The scope of the rights is not limited to the above-described embodiments as the present invention may be modified and implemented in various forms. Therefore, if the modified embodiment includes the elements of the claims of the present invention, it should be viewed as belonging to the scope of the present invention.

100: clothing treatment device
1: cabinet 11: cabinet entry/13: control panel
15: door 3: tub 31: tub body
4: drum 9: drive

Claims (20)

A cabinet forming an exterior, a tub provided inside the cabinet to store water, a drum rotatably provided in the tub to receive clothes, a water supply unit supplying water to the tub, and water of the tub In the control method of the laundry treatment apparatus comprising a drain portion for draining and a driving portion for rotating the drum,
A water supply step of supplying water from the tub;
A drum rotation step of rotating the drum;
A drain rotation step of draining water from the tub while rotating the drum;
Including; a high-speed rotation step of rotating the drum at a higher speed than the drum rotation step,
And a laundry amount sensing step of sensing the amount of the clothes when water from the tub is drained in the drain rotation step. The method of claim 1,
Further comprising a drainage completion detection step of detecting that the water of the tub is drained in the drainage rotation step,
The laundry amount detecting step is performed after the drainage completion detecting step. The method of claim 2,
The drainage completion detection step
And determining that the water in the tub has been drained when it detects that the water level of the tub is lower than the bottom surface of the drum even if it is contained in water. The method of claim 2,
The drainage completion detection step
Even when water is accommodated in the tub, when it detects that the water level of the tub is less than a certain level, the load of the drainage part is less than a certain load, and the load of the driving part is less than a certain load, the water of the tub is drained. The control method of the laundry treatment apparatus, characterized in that it is determined to be. The method of claim 2,
The drainage completion detection step
And determining that the water of the tub is drained when the waveform of the current applied or sensed to the driving unit is sensed within a certain range or forms a certain period. The method of claim 2,
The drainage completion detection step
And determining that the water in the tub has been drained when detecting that the clothing is separated from or separated from the water contained in the tub. The method of claim 1,
The packing amount detection step
An acceleration step of accelerating the drum;
A bag weight reduction step of decelerating the drum;
And an operation step of detecting the amount of cloth through a current value applied to the driving unit or sensed by the driving unit in the acceleration step and the deceleration step. The method of claim 7,
The packing amount detection step
And a laundry stopping step of stopping the supply of current to the driving unit between the laundry weight acceleration step and the laundry weight reduction step. The method of claim 7,
The laundry weight reduction step is a control method of a laundry treatment apparatus, characterized in that the drum is decelerated at a speed lower than the drum rotation speed at the start of the laundry weight acceleration step. The method of claim 7,
The fabrication acceleration step
The control method of the laundry treatment apparatus, characterized in that the drum is accelerated at the drum rotational speed in the drain rotation step. The method of claim 1,
The drainage rotation step
The control method of the laundry treatment apparatus, characterized in that rotating the drum at a faster speed than the drum rotating step. The method of claim 1,
The drainage rotation step
A control method of a laundry treatment apparatus, characterized in that while rotating the drum at a constant speed, the degree of unbalance of the clothes is sensed. The method of claim 1,
The drainage rotation step
The control method of the laundry treatment apparatus, characterized in that rotating the drum at a speed greater than or equal to a resonance speed. The method of claim 1,
When the drum rotation step is finished, further comprising a foam dispersion step of rotating the drum at a lower speed than the drum rotation step,
The control method of the laundry treatment apparatus, characterized in that the drain rotation step and the cloth amount sensing step are performed when the cloth dispersing step is completed. The method of claim 14,
And performing a safety deceleration step of decelerating the drum when the unbalance value detected in the drain rotation step is greater than or equal to the reference value. The method of claim 15,
The control method of the laundry treatment apparatus, characterized in that further performing the cloth dispersing step. The method of claim 15,
Further comprising an additional water supply step of supplying water to the tub,
The control method of the laundry treatment apparatus, characterized in that the cloth dispersing step is performed. The method of claim 14,
And an acceleration passing step of accelerating the drum until a speed greater than or equal to a resonance speed is exceeded when the cloth dispersing step is completed. The method of claim 18,
When the vibration value of the tub or the drum exceeds a set value in the acceleration passing step, the cloth dispersing step is performed again. The method of claim 14,
The control method of the laundry treatment apparatus, characterized in that the drain rotation step lasts longer than the cloth dispersing step.

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