KR20110023061A - Washing machine and method for controlling washing machine - Google Patents

Abstract

PURPOSE: A laundry processing apparatus and a method thereof are provided to perform operation based on the amount of the laundry and to accurately measure the amount of the laundry through the current value of a motor. CONSTITUTION: An operation key(117) inputs a predetermined signal or data to a control unit. A display unit(118) displays inputted information, operation information of a laundry processing unit, or operation complete information. A drum is operated by the rotation of a motor(130). The motor is operated with the AC power source of an inverter. The drum is rotated during the rotation of the motor. A current sensing unit senses output current of the motor.

Description

Washing machine and method for controlling washing machine

The present invention relates to a laundry treatment apparatus and a control method thereof, and more particularly, to a laundry treatment apparatus and a control method capable of sensing the amount of laundry simply and accurately.

In general, the drum laundry treatment machine of the laundry treatment machine washes by using the friction force of the rotating drum and the laundry by receiving the driving force of the motor in the state in which detergent, washing water and laundry are put in the drum, the damage of the laundry is almost The laundry is not entangled with each other, and knocking and rubbing can have a washing effect.

After the washing and rinsing stroke is completed, the dehydration administration proceeds. In order to proceed with the dehydration stroke, it is necessary to accurately detect the amount of laundry. To this end, various coefficients such as characteristic speed values, rotation angles at specific speeds, time to specific speeds, and duty (PWM) values of specific speeds are used. However, this method has a problem in that there are too many related coefficients, and have to go through a fairly complicated process such as setting or adjusting the related coefficients differently as other conditions such as a motor and a dehydration pattern vary.

In addition, this method has a number of factors that need to be readjusted when the model of the laundry treatment device is changed, and the process is also difficult to apply to a new product.

Accordingly, there is a need for a method for measuring the amount of laundry more easily and accurately.

SUMMARY OF THE INVENTION An object of the present invention is to provide a laundry treatment device and a method of controlling the laundry, which can easily and accurately detect the amount of laundry put into the laundry treatment device by measuring a current of an operating motor.

Method for controlling a laundry treatment machine according to the present invention for achieving the above object is a drum in which laundry is inserted is connected to a motor to rotate to a predetermined rotation angle; When the speed of the drum reaches the first rotational speed, stopping the motor; Measuring the current value of the motor while the drum is rotating; And detecting the amount of laundry in response to the current value.

Laundry processing apparatus according to the present invention for achieving the above object, the drum rotates by a motor, the laundry is inserted into the drum; A current sensing unit sensing a current flowing in the motor; And controlling the motor to repeat the operation of rotating the drum to a predetermined rotation angle and stopping the operation a predetermined number of times in the stop state, and the laundry in response to the current measured by the current sensing unit while the drum is rotating. The control unit for detecting the amount of.

According to the present invention, the amount of laundry to be put into the laundry treatment machine can be accurately measured using the current value of the motor only by the simple operation of the laundry treatment machine. In addition, since the current value of the motor is used regardless of the other configuration of the laundry treatment machine, the influence of other factors is less, and thus the amount of laundry can be measured independently, thereby improving accuracy and speed of measurement. Therefore, since the laundry treatment machine operates based on the exact amount of laundry, the laundry balance is improved and the stability of the laundry treatment machine is improved.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

1 is a perspective view showing a laundry treatment apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the laundry treatment apparatus 100 includes a cabinet 110 forming an exterior of the laundry treatment apparatus 100, and a tub disposed inside the cabinet 110 and supported by the cabinet 110. 120, a drum 122 disposed inside the tub 120 and washing the cloth, a motor 130 driving the drum 122, and disposed outside the cabinet body 111 and into the cabinet 110. It includes a washing water supply device (not shown) for supplying the wash water, and a drainage device (not shown) formed under the tub 120 to discharge the wash water to the outside.

A plurality of through holes 122A are formed in the drum 122 to allow the washing water to pass therethrough, and when the drum 122 is rotated, the laundry is lifted to a predetermined height, and then the inner side of the drum 112 is dropped by gravity. Lifter 124 may be disposed.

The cabinet 110 includes a cabinet main body 111, a cabinet cover 112 disposed at the front of the cabinet main body 111 and coupled thereto, and a control disposed at the upper side of the cabinet cover 112 and coupled with the cabinet main body 111. The panel 115 and a top plate 116 disposed above the control panel 115 and coupled to the cabinet body 111 are included.

The cabinet cover 112 includes a fabric access hole 114 formed to allow the fabric to enter and exit, and a door 113 disposed to be rotatable from side to side to allow the fabric access hole 114 to be opened and closed.

The control panel 115 is operation keys 117 for operating the operation state of the laundry processing apparatus 100 and a display unit 118 disposed on one side of the operation keys 117 and displaying an operation state of the laundry processing apparatus 100. ).

The operation keys 117 and the display unit 118 in the control panel 115 are electrically connected to a control unit (not shown), and the control unit (not shown) electrically controls each component of the laundry processing apparatus 100 and the like. . The operation of the controller (not shown) will be described later.

2 is an internal block diagram of the laundry machine of FIG.

As shown in FIG. 2, the laundry treatment machine operates the operation keys 117, the display unit 118, the drum 122, the motor 130, the current sensing unit 220, and the laundry treatment machine as described above. It includes a control unit 210 for controlling the first half.

In this case, the laundry treatment machine includes at least one sensing means for sensing temperature, pressure, voltage, current, water level, rotation speed, etc. in addition to the current sensing unit 220 to apply the detected or measured data to the controller 210. do. For example, the water level of the water at the time of water supply or drainage in the laundry treatment machine, the temperature of the water supplied, the rotation speed of the washing tank or drum can be measured. In addition, the laundry treatment device further includes a memory for storing data, a water supply part for controlling water supply drainage, or a drainage part, but a description thereof will be omitted below.

The operation key 117 is disposed on the control panel as described above, and is operated by the user to input a predetermined signal or data to the controller 210. In this case, the operation key 117 includes at least one input means, and includes a button, a dome switch, a touch pad (static pressure / capacitance), a jog wheel, a jog switch, a finger mouse, a rotary switch, a jog dial, and the like. It can be configured, any device that generates a predetermined input data by the operation of pressing, rotation, pressure, contact or the like can be applied. The operation key 117 may apply a different signal to the control unit 210 according to the number of continuous operations and the operation time to the control unit 210 to cause the laundry treatment apparatus to perform a specified specific operation.

The display unit 118 displays, on the screen, information input by the operation key 117, information on the running operation of the laundry processing apparatus, and information upon completion of the operation, in response to the control command of the control unit 210. FIG. In addition, an error relating to a malfunction in the malfunction of the home appliance is displayed. For example, the progress of operations such as main washing, rinsing, and dehydration may be displayed using at least one of letters, numbers, special characters, emoticons, and images.

In this case, the laundry treatment machine may further include an output means such as a lamp or a vibrating element that is turned on or blinking in addition to the display unit 118, and a description thereof will be omitted below.

The control unit 210 receives an operation signal from the operation key 117 and operates. In response to the washing course selected by the operation key 117 and the operation setting, the controller 210 controls the motor and controls the water supply and drainage so that main washing, rinsing, and dehydration strokes are performed.

The control unit 210 displays an operation state of the laundry processing apparatus 100 through the display unit 118, and displays information on the washing course and operation setting input through the operation key 117 as described above.

Here, the controller 210 controls the motor 130 for main washing, rinsing, and dehydration stroke by using an inverter. For example, the controller 210 applies a pulse width modulation (PWM) switching control signal to the inverter as shown in FIG. 3 to be described later, and the inverter performs an AC power supply of a predetermined frequency as a high speed switching operation corresponding thereto. Supply to 130.

The motor 130 operates the AC power supplied from the inverter as the operating power, and as the motor 130 rotates, the drum 122 connected to the motor 130 rotates.

The drum 122 is disposed inside the tub 120 as shown in FIG. 1, and laundry is inserted, and the drum 122 is operated by the rotation of the motor 130. As the drum 122 rotates by the motor 130, the laundry introduced into the drum 122 is removed from contaminants through main washing, rinsing, and dehydration.

The current detector 220 detects a current flowing in the motor 130, that is, an output current io. The current sensing unit 220 may be various examples such as a hall sensor and an encoder. The current detector 220 periodically detects a current io flowing in the motor 130 and inputs it to the controller 210.

The controller 210 detects the amount of laundry based on the current io detected by the current detector 220. The detected amount of laundry is displayed on the display unit 118.

Specifically, as the motor 130 operates, while the drum 122 rotates from the stop state to a predetermined rotation angle, the amount of laundry is sensed based on the current value io of the motor 130.

In this case, the laundry treatment machine may further include an eccentric amount detecting unit (not shown) for detecting an unbalanced degree (eccentricity) of the laundry put into the drum 122, that is, an unbalance (UB) of the drum 122. The eccentric amount detecting unit may perform unbalance detection based on the rotation speed change amount of the drum 122, that is, the rotation speed change amount of the motor 130. To this end, a speed detector (not shown) for detecting the rotational speed of the motor 130 is separately provided or based on the output current value io of the motor 130 detected by the current detector 220 described above. The rotational speed can be calculated and based on this, the amount of eccentricity can be detected. The eccentric amount detection unit may be provided in the control unit 210.

3 is an internal block diagram of the controller of FIG. 2.

As illustrated in FIG. 3, the controller 210 includes a speed calculator 305, a current command generator 310, a voltage command generator 320, and a switching control signal output unit 330.

The speed calculator 305 calculates the rotor speed v of the motor 130 based on the detected output current io. The speed calculator 305 may calculate the position of the rotor in addition to the speed of the rotor.

The current command generation unit 310 generates current command values i * d and i * q based on the operation speed v and the speed command value v *. That is, the current command generator 310 generates a PI command current (i * d, i * q) based on the estimated speed v and the speed command value v * and the current command value i. and a current command limiting unit (not shown) for limiting the level so that * d, i * q) does not exceed a predetermined value, respectively.

The voltage command generation unit 320 generates the voltage command values v * d and v * q based on the current command values i * d and i * q and the detection current io. That is, the voltage command generator 420 generates a PI command value v * d and v * q based on the current command values i * d and i * q and the detection current io. And a voltage command limiting unit (not shown) for limiting the level so that the voltage command values v * d and v * q do not exceed a predetermined value, respectively.

The switching control signal output unit 330 generates an inverter switching control signal Sic, which is a PWM signal, based on the voltage command values v * d and v * q, and outputs the inverter to the inverter (not shown).

The motor 130 operates by following the speed command value v * by the inverter switching control signal Sic. While rotating the motor 130 to a predetermined angle, in order to detect the amount of laundry based on the current value of the motor 130, the speed command value v * may be, for example, 50 rpm.

Meanwhile, the current value of the motor 130 is preferably an output current io of the motor 130 detected by the current sensing unit 220, but is not limited thereto. The current command value i * d, i * q ) Since the output current io of the motor 130 flows in accordance with the current command values i * d and i * q, the laundry amount may be sensed based on the current command values i * d and i * q. have.

4 is a view showing an example of the operation of the drum in the laundry treatment machine of FIG.

The drum 122 is in a state as shown in a of FIG. 4 while the operation is stopped. At this time, the laundry 300 put into the drum is located under the drum 122.

When the drum 122 rotates at a predetermined rotational angle by rotating the motor 130, the laundry in the drum 122 moves in one direction together with the drum. At this time, since the rotation speed of the drum is more than a predetermined speed, the laundry 300 rotates like the drum while being attached to the drum. At this time, even if the rotation angle is greater than a certain angle, the laundry is placed on the rotating drum so as not to fall to the lower portion.

When the rotational speed is higher than a certain speed, the laundry does not fall from the drum by the centrifugal force acting in the drum and remains attached to the drum. For example, when rotating at about 50 rpm or more, theta is attached to the drum as described above so that it does not fall off.

However, when the drum stops during rotation when the rotation angle is small, the drum moves back to the stopped state due to gravity, and the laundry moves with it, but when the rotation angle increases, the laundry falls to the bottom when the drum stops during rotation. .

At this time, the current sensing unit 220 measures the current value applied to the motor 130 while the drum 133 is rotating, the control unit 210 detects the amount of laundry using this.

As shown in b of FIG. 4, since there is an energy barrier required to rotate the drum 122, the current value measured at the motor 130 is initially measured at a certain magnitude and maintained at a constant magnitude as time passes. As you reach or exceed the energy barrier and reach a threshold, the current decreases in an inverse curve.

At this time, as the amount of the laundry put into the drum 122 increases (weight increases), the initial force required to start the rotation of the drum increases, so that the current value of the motor is also changed.

That is, the smaller the amount of laundry (the lighter), the faster the current decreases and the sharper the reduction curve appears.The larger the amount of the laundry, the heavier the longer, the longer the current of the motor stays above a certain value. The slope of the reduction curve with decreasing current is also lowered.

Using this feature, the control unit 210 may calculate the amount of laundry using the current of the motor 130 measured by the current sensing unit 220.

As such, the controller 210 detects the amount of laundry based on the current value of the motor 130 during the rotation of the drum 122 while rotating the drum 122 to a predetermined rotation angle in the stop state. At this time, the rotation and stop operations of the motor may be repeated a predetermined number of times.

In this case, when detecting the amount of laundry, the motor 130 may rotate once at a rotation angle within a range of 0 degrees or more and 360 degrees. For example, when the rotation angle is 90 degrees, the rotation of the drum connected to the motor to the rotation angle 90 degrees corresponds to about 6 pulses of the Hall sensor, so that the controller 210 operates the motor for about 6 pulses of the Hall sensor. In operation, the drum rotates at a rotation angle of about 90 degrees, and while the drum rotates, the current value of the motor is measured and received through the current sensing unit 220.

In addition, the rotational speed of the motor 130 is preferably a speed at which the laundry is attached to the drum 122, this speed may be approximately 50rpm.

The control unit 210 repeatedly performs a predetermined number of times of stopping the operation after rotating the drum 122 at a predetermined rotation angle as described above, and calculates the amount of laundry as the sum of the measured current value.

5 to 6 is a view showing an example of the operation of the drum in the laundry treatment machine of FIG.

5 is an example of a case where the drum stops after the 90-degree rotation operation.

As shown in Figure 5a, the drum is stationary (311) laundry is located at the bottom of the drum. At this time, when the motor is rotated about 90 degrees to the left, the laundry 300 moves to the left side with the drum in the state attached to the drum (312).

Laundry stops at the bottom of the drum when the motor is stopped (313). At this time, the drum is also rotated to the left, and when the motor is stopped, the drum is moved to the stationary position by the load.

After a predetermined time stop, as the motor 130 is operated, the drum 122 rotates to a left by a predetermined rotational angle, about 90 degrees, and thus the laundry moves together (314). When the motor stops, the motor moves back to the stopped state (315) and when the drum moves to the left again during the motor operation, the laundry moves together (316).

When the drum detects the amount of laundry, the drum stops after a rotation operation of about 90 degrees in either direction as described above. In this process, the current value of the motor 130 is measured to detect the amount of laundry.

On the other hand, b of FIG. 5 rotates a predetermined number of times by 90 degrees, but does not rotate only in one direction but stops after left rotation (321, 322), stops (323), and after right rotation (324) ( 325, again rotating to the left (326).

According to the operation of the motor 130, the amount of laundry put into the drum is measured using the current value of the motor as the drum 122 rotates.

6 shows an example in which the drum rotates about 180 degrees.

In the stopped state (331), as the motor 130 rotates the drum connected to the motor rotates (332). The drum rotates to about 180 degrees (333) and returns to a stopped state as the motor stops (334). At this time, the laundry 300 is attached to the drum and rotates together as the drum rotates, and returns together with the drum when the drum returns to a stationary state. It can be returned by rotating in the opposite direction of. However, the laundry attached to the drum may fall to the bottom of the drum when the motor stops at about 180 degrees. Such rotation and stop operations are repeated a predetermined number of times.

On the other hand, the drum may rotate once and stop. This is an example.

In the stationary state 331, when the drum 122 rotates in one direction, the laundry is attached to the drum and rotates together. When the drum is rotated once (360 degrees), the laundry is rotated once with the drum while attached to the drum. Such rotation and stop operations are repeated a predetermined number of times.

As the motor 130 is driven, while the drum is rotating, the current sensing unit 220 measures the current value of the motor and applies it to the control unit 210, and the control unit 210 sums the current values of the motors measured at each rotation. After calculating the average, it is possible to detect the amount of laundry corresponding to the average value. It is noted that the value of the rotation angle presented here is merely an example and is not limited thereto.

The controller 310 detects the amount of laundry during the repetition of the rotation and stop operation, and may calculate the amount of the laundry even when the rotation and the stop are performed once. However, it is preferable to perform twice or three times for more accurate measurement. In some cases, even if the drum rotates and stops three times as the motor operates, the amount of laundry can be calculated using only the current value of the motor measured in one and two times.

7 is a view showing a dewatering method of the laundry treatment machine of FIG.

As shown in FIG. 7, when the laundry treatment apparatus starts dehydration of wet laundry (S410), the laundry treatment apparatus detects an amount of laundry (S320).

At this time, the method for detecting the amount of laundry, as described above, by operating the motor 130 to rotate the drum at a predetermined angle, and repeats the process to rotate again after the stop, at least during the drum is rotated In some divisions, the amount of laundry can be detected by measuring the current value of the motor 130 and calculating the average after summing.

When the amount of laundry is detected, it detects an unbalance in preparation for high speed rotation (S430). At this time, it is determined whether the laundry is put in the drum according to the detected amount of laundry.

If the laundry load is in a normal state, the maximum rotation speed at the time of dehydration is set in response to the detected amount and eccentricity of the laundry, and after performing the first dehydration which is simple dehydration (S440), the second dewatering at the set maximum rotation speed is performed. Perform (S450).

The above operation may be applied to dehydration during washing, dehydration during washing, and dehydration during rinse.

FIG. 8 is a flowchart illustrating a method of detecting an amount of laundry in the laundry treatment apparatus of FIG. 1.

Referring to FIG. 8, when the laundry is started, the laundry treatment device senses the amount of laundry to set the water level when all the processes according to main washing, rinsing, and dehydration are performed. In addition, in the dehydration and dehydration strokes included in each stroke, the maximum rotational speed is set in consideration of the load caused by the high speed rotation of the drum, or the amount of laundry is sensed in order to set a standard for eccentricity detection.

When detecting the amount of laundry, the control unit 210 first initializes the count (S480), and increases the motor to the first rotation speed (S490). In this case, the first rotational speed may be set to about 50 rpm as a speed at which the laundry is attached to the drum, but this may vary depending on the setting.

In addition, the controller 210 allows the drum to rotate to the first rotation angle, wherein the first rotation angle is within one rotation (0 to 360 degrees) such as 90 degrees, 120 degrees, 135 degrees, 180 degrees, and 360 degrees. Can be set at For example, the motor may rotate up to 90 or 180 degrees, or in some cases, one revolution.

The current sensing unit 220 measures a current value while the drum rotates. The control unit 210 receives the current value of the motor measured from the current sensing unit 220 while the drum rotates to calculate the amount of laundry.

In this case, the current sensing unit 220 may measure the current value continuously while the drum is rotating, and in some cases, the current value may be measured during the drum rotation. That is, the current sensing unit 220 does not always measure the current value of the motor even when the drum rotates.

For example, while the drum 122 is rotated by a predetermined angle by the operation of the motor 130, a current is applied to some sections such as 0 to 45 degrees, 30 to 120 degrees, 0 to 90 degrees, and 90 degrees to 180 degrees. You can also measure the value. However, the current sensing unit 220 preferably measures the current of the motor for the same section while repeating the current measurement. For example, when measuring the current in the 0 to 90 degrees section it is preferable to measure the current in the same 0 to 90 degrees section thereafter.

The controller 210 stops the motor 130 when the rotation angle is reached (S520). Stop the motor for a predetermined time and align the position of the motor (S530). At this time, if the position of the motor is different from the initial position, the drum may flow, so the accuracy of the laundry amount detection is reduced, so that the position of the motor is aligned. When the motor is aligned, the PWM output is fixed in a certain pattern for a certain time to generate the desired torque at the desired electrical position, so the current flowing in the motor becomes a direct current.

The motor 130 is controlled to increase the rotational speed of the motor to the first rotational speed. At this time, the current sensing unit 220 measures the current value of the motor. At this time, the control unit 210 accumulates or stores the measured current value or adds it. When the motor rotates to the rotation angle (S510). Stop the motor (S520), and align the motor position (S530). At this time, the motor stops operating when the rotation speed increases to the first rotation speed and reaches the first rotation speed.

The rotation angle may be set from 0 to 360 degrees, and the current sensing unit 220 continuously measures the current while the motor rotates, or the current value when the designated part is rotated within the predetermined rotation angle range. Can be measured.

Here, when the count is less than the reference number of times (S540), the rotation and stop of the motor is repeated as described above (S490 to S540, S570).

If the count is greater than or equal to the reference number of times (S540), the controller 210 calculates an average value according to the reference number of times by adding up the stored current values (S550). At this time, the control unit 210 may calculate the amount of laundry in accordance with the current value measured each time, and if the drum stops after the rotation operation more than the reference number of times, it can finally calculate the amount of laundry. The controller 210 calculates an amount of laundry in response to the calculated average value (S560).

At this time, the greater the amount of laundry, the greater the current value consumed, so the amount of laundry can be detected.

FIG. 9 is a graph illustrating a rotation speed of the drum in the laundry treatment machine of FIG. 1. FIG.

As shown in FIG. 9, the control unit 210 detects the amount of laundry before dehydration is performed. At this time, in the section for detecting the amount of laundry (610), the controller 210 controls the motor as described above to stop the drum after the rotation to a predetermined rotation angle (611). This rotation and stop process is repeated a predetermined number of times (611 to 613). In this case, the number of repetitions of the rotation and stop operations may be changed according to a setting.

At this time, the control unit 210 increases the rotational speed of the motor to the first rotational speed, stops it to decrease the speed, and operates the motor up to the first rotational speed again after a certain time stop. Here, the controller 210 stops the operation of the motor without maintaining the first rotation speed when the rotation angle is reached at the first rotation speed.

When the amount of laundry is sensed, the control unit 210 detects the eccentricity (620), so that the main dehydration is performed (630). In this case, the controller 210 may set a reference value for the eccentricity detection in response to the detected amount of laundry, and set the maximum rotational speed according to the present dehydration. For example, the control unit 210 may set the eccentricity detection number and the eccentricity detection method differently according to whether the calculated amount of laundry is a single load, and may also change the maximum rotational speed of the dehydration. The setting of the eccentricity detection and the present dehydration to be performed later may also vary depending on whether the amount of laundry is very small, small, general, large or extremely large.

At the time of detecting the eccentricity, the controller 210 increases the rotational speed of the motor 130 to the second rotational speed A, maintains a predetermined time, and then increases the speed up to the third rotational speed B and then rotates the third rotation. The speed B is maintained (621). In addition, after the reduction to the second rotation speed (A) is maintained for a certain time, the rotation speed is increased to the fourth rotation speed (C) to maintain a predetermined time (622). After the second rotational speed is reduced again to maintain a predetermined time, the fourth rotational speed (C) is increased again to maintain a predetermined time (623).

At this time, the eccentric amount detecting unit (not shown) detects the eccentricity in the eccentric sensing section 620 as described above and applies it to the control unit 210, the control unit 210 determines whether the dehydration proceeds in response to the detected eccentricity Or, in consideration of the eccentricity together with the amount of laundry, the rotation speed at the time of this dehydration can be set variable.

When performing the dehydration 630, the control unit 210 controls the motor 130, and at the fourth rotational speed C maintained in the eccentric detection 620, the rotational speed is directly changed to the sixth rotational speed E without deterioration. ) And then increase the rotational speed step by step until the seventh rotation speed (F), the eighth rotation speed (G). At this time, the eighth rotation speed G is the maximum rotation speed at the time of the dehydration, and may vary according to the amount or eccentricity of the laundry.

FIG. 10 is a graph illustrating a relationship between the number of cloths and the current of the laundry treatment machine of FIG. 1.

In FIG. 10A, the x-axis is the number of laundry, and the y-axis is a voltage corresponding to the measured current. FIG. 10B shows a case where the rotation angle is 90 in FIG.

As described above, when sensing the amount of laundry, the current value of the motor is summed while the drum is rotating to obtain an average, and the amount of laundry is detected according to the average.

When the voltage value corresponding to the average value of the current values is calculated, as shown in a and b of FIG. 10, the voltage value corresponding to the current increases as the number of laundry increases, that is, as the amount of laundry increases. Able to know.

In FIG. 10A, the upper graph is a graph for slowly accelerating and rotating up to a 90 degree rotation angle when the drum is rotated 90 degrees, and the lower graph is rapidly up to 90 degrees when the drum is rotated 90 degrees. This is a graph of rotating by accelerating.

It can be seen that in both the case of rapidly accelerating and rotating to a predetermined rotation angle and the case of slowly accelerating and rotating, the magnitude of the voltage corresponding to the current of the motor increases as the amount of laundry increases.

At this time, it can be seen that the slope of the case of slowly accelerating (1) and the case of rapidly accelerating (2) as shown in FIG.

Since the graph slope of the case of slowly accelerating (1) is large, the fine slope is divided into a plurality of steps in detecting the amount of laundry. It is desirable for the car to slowly accelerate the motor to rotate the drum.

FIG. 11 is a view illustrating a change of a current value measured according to a state of laundry in the laundry treatment machine of FIG. 1.

When washing, rinsing, dehydrating, and drying in a laundry treatment machine, the amount of laundry can be detected before washing administration, before dehydration, dehydration administration, and drying administration.

In the following, the values of the x-axis represent the weight of the laundry (kg) in FIGS. 11 a to c, and 13 is related to the type of laundry, 13 is baby clothes, 14 is jeans, 15, 16, 17 is Towels are divided according to size, 18 and 19 represent spring, autumn or winter jumpers, and 20 represent towel material. At this time, the value 0 means an empty drum into which laundry is not put.

FIG. 11A is a diagram illustrating values measured by detecting an amount of laundry for laundry in a dry state before laundry and water supply, before washing.

As shown in the figure, the amount of laundry detected is also increased as the weight of the dry laundry is increased in units of 1 kg. At this time, since the amount of laundry is measured by using the current value of the motor, a constant value is measured even in the case of an empty drum having zero weight. have.

That is, the laundry treatment apparatus measures the amount of laundry as described above. In this case, when a value corresponding to the weight of the laundry is calculated as described above, the controller 210 indicates that the drum is an empty drum which does not contain laundry. It can be detected.

In addition, since the amount of laundry to be measured is different as shown according to the type of laundry, the controller 210 determines the type of laundry using the calculated value by performing an operation of detecting the amount of laundry in the laundry processing apparatus. can do.

FIG. 11B illustrates the amount of laundry before dehydration, and is a result of the amount of laundry detected when the laundry is wet.

As shown in b of FIG. 11, as the weight of laundry increases, the amount of laundry detected is also proportionally increased. In this case, the controller 210 may determine whether the drum is empty by using a value measured when the drum does not contain laundry.

11 b is for the laundry in the wet state before dehydration, so the detected value is larger than that in FIG.

In particular, according to the type of laundry, baby clothes, jeans, towels, jumpers in the case of the difference appears larger than the value detected in the dry state, it is possible to distinguish the type of laundry more easily. Towel absorbs a lot of water, so the wet state is detected as a larger value than the dry state, and it can be seen that it is detected as a value larger than the towel of the jumper.

In this case, when comparing the detection result of the laundry in the dry state and the detection result of the laundry in the wet state, it is possible to determine the type of laundry in more detail.

11C is a result of detecting the amount of laundry for the laundry in the wet state after completing the dehydration, before performing the drying stroke.

At this time, since the laundry is dehydrated but wet, the detected value is larger than that of the dry laundry, and the detected value is lower than that of the laundry before dehydration.

Since a certain value is measured when the drum is empty in the result of detecting the amount of laundry for the laundry in the dehydrated wet state, the controller 210 may determine whether the drum is empty before performing drying.

Therefore, when the laundry treatment device detects the amount of laundry by rotating the drum at a predetermined angle as described above and measuring the current value of the motor, the laundry treatment machine can perform the exact amount of laundry quickly and independently. In addition, by sensing the amount of laundry as described above, it is possible to determine whether the laundry is contained in the drum or empty state, and also can determine the type of laundry according to the detected value.

On the other hand, the control method of the laundry treatment machine of the present invention can be implemented as code that can be read by the processor on a processor-readable recording medium provided in the laundry treatment machine. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor. Examples of the processor-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and also include a carrier wave such as transmission through the Internet. The processor-readable recording medium can also be distributed over network coupled computer systems so that the processor-readable code is stored and executed in a distributed fashion.

In addition, while the above has been shown and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the specific embodiment described above, the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a perspective view showing a laundry treatment apparatus according to an embodiment of the present invention.

2 is an internal block diagram of the laundry machine of FIG.

3 is an internal block diagram of the controller of FIG. 2.

4 is a view showing an example of the operation of the drum in the laundry treatment machine of FIG.

5 to 6 is a view showing an example of the operation of the drum in the laundry treatment machine of FIG.

7 is a view showing a dewatering method of the laundry treatment machine of FIG.

FIG. 8 is a flowchart illustrating a method of detecting an amount of laundry in the laundry treatment apparatus of FIG. 1.

FIG. 9 is a graph illustrating a rotation speed of the drum in the laundry treatment machine of FIG. 1. FIG.

FIG. 10 is a graph illustrating a relationship between the number of cloths and the current of the laundry treatment machine of FIG. 1.

FIG. 11 is a view illustrating a change in a current value measured according to a state of laundry in the laundry treatment machine of FIG. 1.

<Explanation of symbols on main parts of the drawings>

100: laundry treatment equipment 118: display unit

122: drum 130: motor

210: control unit 220: current detection unit

Claims (13)

A drum in which laundry is loaded is connected to a motor to rotate to a predetermined rotation angle; When the speed of the drum reaches a predetermined rotation speed, stopping the motor; Measuring the current value of the motor while the drum is rotating; And And controlling the amount of laundry in response to the current value. The method of claim 1, And repeating the rotating and stopping steps a predetermined number of times, detecting the amount of the laundry, and finally calculating the amount of the laundry corresponding to the sum of the current values. The method of claim 1, The current value measuring step of controlling the laundry treatment device, characterized in that for measuring the current value for any one section of the rotation angle range while the drum is rotating. The method of claim 1, The current value measuring step of the laundry treatment device, characterized in that for measuring the current value continuously within the rotation angle range while the drum is rotating. The method of claim 1, The rotation angle is a control method of a laundry treatment machine, characterized in that set within the range of 0 to 360 degrees. The method of claim 1, And said current value is one of an output current value flowing through said motor and a current command value for driving said motor. The method of claim 1, And if the detected amount of laundry is less than or equal to a reference value, determining that the laundry is not put in the drum. The method of claim 1, And determining the material of the laundry in response to the detected amount of laundry. The method of claim 1, And after the stopping step, aligning the position of the motor. A drum rotating by a motor, the laundry being inserted and rotating; A current sensing unit sensing a current flowing in the motor; And Controlling the motor to repeat the operation of rotating the drum to a predetermined rotation angle and stopping the operation a predetermined number of times in the stopped state, and the amount of the laundry corresponding to the current measured by the current sensing unit while the drum is rotating. Laundry processing apparatus comprising a control unit for detecting the. 11. The method of claim 10, And the controller stops the motor when the speed of the motor reaches a predetermined rotational speed, and aligns the position of the motor to an initial position when the drum is stopped. 11. The method of claim 10, The control unit, the laundry treatment device, characterized in that for determining whether the drum is empty or the material of the laundry in response to the detected amount of laundry. 11. The method of claim 10, And the current sensing unit measures the current value of the motor in one section within the range of the rotation angle while the drum is rotated, and applies the current to the controller.

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