KR20080085393A - Controlling method for drum washer - Google Patents

Abstract

A method for controlling a frontloading washer is provided to release eccentricity by reducing RPM of a drive motor for allowing laundry to move in a drum favorably. A method for controlling a frontloading washer comprises the steps of accelerating a drive motor and sensing eccentricity at a first speed of the drive motor, and decelerating the drive motor to a second speed if the sensed eccentricity is over a set value.

Description

Control method of drum washing machine {CONTROLLING METHOD FOR DRUM WASHER}

1 is a graph showing the speed of the drive motor or the drum with time during the dehydration stroke according to the control method of the drum washing machine according to the prior art.

2 is a cross-sectional view of a drum washing machine to which the present invention is applied.

3 and 4 are the first and second graphs showing the speed of the drive motor or the drum with time during the dehydration stroke according to the control method of the drum washing machine according to the present invention.

5 is a flowchart of a control method of a drum washing machine according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: drum washing machine 8: drum

12: drive motor

The present invention relates to a control method of a drum washing machine, and more particularly, to a control method of a drum washing machine to shorten the eccentric detection time in the eccentric detection section and to perform accurate eccentric detection.

In general, a drum washing machine is a device that allows washing to be performed by using a friction force of a rotating laundry drum and a laundry by receiving a driving force of a driving unit while detergent, washing water, and laundry are put into a washing drum. If it doesn't get tangled up, tap and rub to create a laundry effect.

Looking at the operation of the general drum washing machine configured as described above are as follows.

First, after the door is opened, the laundry cloth is put into the drum through the laundry cloth entrance, and after the door is closed and the laundry cloth entrance is sealed, the detergent is supplied to the detergent supply device according to the type and quantity of the laundry cloth put into the drum. Is committed.

When the drum washing machine is operated, the quantity of the laundry cloth put into the drum is sensed, and a washing method such as a washing course, a washing time, a water level, a detergent amount, etc. is set according to the detected quantity. It works. That is, the water is supplied to the inside of the tub by the water supply device, and the detergent introduced into the detergent supply device is supplied into the tub in a state of being mixed with the water supplied by the water supply device.

 If the drum is rotated by the motor after the wash water is stored in the tub to the predetermined level, the laundry cloth is lifted up to a certain height by the lifter installed in the drum and then dropped by gravity, and the laundry cloth is dropped by the interaction between the free fall force and the wash water. Contamination is eliminated.

When the washing stroke is completed, the contaminated washing water in the tub is drained out of the washing machine through the drainage device.

Thereafter, the drum washing machine is subjected to several rinsing strokes to rinse the remaining foam in the laundry cloth. That is, clean water is supplied to the inside of the tub to a predetermined level by the water supply device, the washing cloth is rinsed while the drum is rotated by the motor, and the rinsed water is drained to the outside through the drainage device.

When several rinsing strokes are completed as described above, the drum is rotated at a high speed by the motor to completely centrifuge the water of the laundry cloth, and in the case of the drum washing machine equipped with a drying apparatus, the drying stroke is also performed.

1 is a graph showing the speed of the drive motor or the drum with time during the dehydration stroke according to the control method of the drum washing machine according to the prior art.

As shown in FIG. 1, after the speed of the driving motor or the speed of the drum reaches the first set rpm, the eccentric sensing section is performed while maintaining the constant speed for a predetermined time with the first set rpm. do. In this eccentric detection section, if the eccentricity is more than the set value, it is regarded as an eccentric failure and after decelerating the speed of the motor and the drum speed to '0' (i.e., RMP 0), the speed of the driving motor or the speed of the drum is again. Accelerates to the first setting RPM1. Therefore, considerable time is required due to the acceleration from AlpM 0 to the first set RPM1 and the deceleration from the first set RPM1 to RMP0.

In addition, as shown in FIG. 1, in the conventional control method, the eccentric sensing section is performed while maintaining a constant speed for a predetermined time with the first set RPM1, so that the speed of the driving motor or the speed of the drum is zero from the RMP0. 1 Does not detect an eccentricity in the acceleration section to the setting RPM (rpm1). If the eccentricity is severe, there is a problem that the walking (walking) phenomenon of the washing machine frequently occurs in this acceleration section.

In order to solve this problem, an object of the present invention is to provide a control method of a drum washing machine to reduce the acceleration section and the deceleration section in the eccentric detection section.

In addition, an object of the present invention is to provide a control method of a drum washing machine to be the eccentric detection in the acceleration section of the eccentric detection section.

In the following, the invention is explained in detail based on the embodiments of the invention and the accompanying drawings.

2 is a cross-sectional view of a drum washing machine to which the present invention is applied. As shown in FIG. 2, the drum washing machine 1 can be buffered by a cabinet 2 forming the exterior of the drum washing machine 1, and a spring 3 and a damper 4 inside the cabinet 2. The tub 6, the drum 8 rotatably disposed inside the tub 6 and having a hand 8A formed on the outer circumferential surface thereof, and the drum 8 installed on the inner surface of the drum 8 by gravity at a predetermined height. A plurality of lifters 10 for pumping the laundry so that the laundry falls, a drive motor 12 provided at the rear of the tub 6, and a drive motor 12 installed between the drive motor 12 and the drum 8. It comprises a power transmission mechanism 40 for transmitting the power of the drum (8).

Here, a cabinet cover 14 having a laundry entrance 14A formed at the center of the cabinet 2 may be mounted on the front surface of the cabinet 2 to open and close the laundry entrance 14A at the cabinet cover 14. The door 16 is rotatably installed so that it may rotate.

In addition, a water supply device 20 for supplying the washing water to the tub 6 is installed above the tub 6, and below the tub 6 to discharge the washing water stored in the tub 6 to the outside. Drainage 30 for is installed.

The water supply device 20 includes a water supply valve 22 for intermitting water flowing into the drum washing machine 1, a water supply hose 24 connecting the water supply valve 22 and the tub 6, and a water supply hose. It is installed in communication with one side of the 24 is composed of a detergent supply device 26 for supplying detergent to the tub (6).

The drainage device 30 includes a drain pump 32 for pumping the wash water stored in the tub 6 and a drain hose 34 for guiding the wash water pumped by the drain pump 32 to the outside of the cabinet 2. It consists of.

In addition, the power transmission mechanism 40 includes a motor pulley 42 fixed to the rotary shaft 13 of the drive motor 12, a drum pulley 44 fixed to the rotary shaft 9 of the drum 8, and a drum pulley. And a belt 46 for interlocking the 44 with the motor pulley 42. The motor pulley 42 is formed in a cylindrical shape with a hollow inside and is fixed to an end portion of the rotation shaft 13 of the driving motor 12, and the drum pulley 44 is disposed through the rear surface of the tub 6 with a drum ( 8) is fixed to the end of the rotating shaft (9).

As the driving motor 12 is driven, the motor pulley 42 and the drum pulley 44 are interlocked by the belt 46 to transmit the driving force of the driving motor 12 to the drum 8.

The sensor (not shown) attached to one side of the drive motor 12 continuously detects the rotational speed of the drive motor 12 and transmits it to the system microcomputer (or control unit) (not shown), and the system microcomputer drives the motor. The rotation speed (rpm) is calculated according to the rotation speed of (12).

3 and 4 are the first and second graphs showing the speed of the drive motor or the drum with time during the dehydration stroke according to the control method of the drum washing machine according to the present invention.

In the speed graph shown in FIG. 3, the first eccentric detection section is performed while the speed of the drive motor 12 or the speed of the drum 8 is kept constant at the first set RPM1. This first setting RPM1 is a speed at which the cloth in the drum 8 does not flow. When it is determined that the eccentricity is larger than the set value in this primary eccentric detection section, the speed of the drive motor 12 or the speed of the drum 8 is decelerated to a second set rpm (rpm2) exceeding the alpha 0. The second set rpm (rpm2) is a speed at which the fabric in the drum 8 can be easily flowed at a lower speed than the first set rpm (rpm1). Since the second set rpm 2 is maintained for a predetermined time, the foam in the drum 8 is released (a kind of foaming section). Since the deceleration section in the first eccentric detection section is a deceleration from the first set ALPM (rpm1) to the second set ALPM (rpm2), it is performed in a considerably shorter time than the deceleration section in the prior art.

After the fixed time is maintained in the second set RPM2, the speed of the drive motor 8 or the speed of the drum 8 is accelerated to perform the second eccentric sensing section. As a result, when the first set RPM1 is reached, the second eccentric detection section is performed. In addition, since the acceleration section in the second eccentric sensing section is the acceleration from the second set ALPM (rpm2) to the first set ALPM (rpm1), it is performed in a considerably shorter time than the acceleration section in the prior art.

That is, the control method of the drum washing machine according to the speed graph shown in FIG. 3 does not reduce the speed of the drive motor 12 and the speed of the drum 8 to zero when the eccentricity fails, and the flow of the fabric exceeding zero By decelerating to the second easily set rpm (rpm2), the deceleration section and the acceleration section are shortened.

The speed graph shown in FIG. 4 shows the speed of the drive motor 12 or the drum during the acceleration of the speed of the drive motor 12 and the speed of the drum 8 for the performance of the first eccentric detection interval, that is, the acceleration section. (8) is a speed graph. As shown in FIG. 4, the speed is abrupt because the flow of the fabric in the drum 8 takes place until the speed of the drive motor 12 or the speed of the drum 8 reaches the first set RPM1. Increasing and decreasing portions exist. This increase and decrease in speed will increase in correspondence with the degree of eccentricity of the fabric in the drum 8.

As shown in FIG. 4, the speed of the drive motor 12 or the speed of the drum 8 reflects the degree of eccentricity of the artillery in the drum 8, so that the increase and decrease are repeated. Accordingly, the sum of the rotation speed differences between the poles (M1) and (m1), the speed difference between (M2) and (m2), and the speed difference between (M3) and (m3) are added or summed and averaged. For example, one can estimate the rate of increase or decrease that reflects the degree of eccentricity of the gun.

In addition, the system microcomputer stores the reference speed increase and decrease degree for the judgment of this eccentricity. That is, the degree of eccentricity is judged using the reference speed increase and decrease degree which can determine the degree of eccentricity corresponding to the individual speed increase and decrease degree.

For example, the speed increase / decrease degree when the eccentricity is severe is relatively larger than the speed increase / decrease information when the eccentricity is weak.

5 is a flowchart of a control method of a drum washing machine according to the present invention. In the flowchart of FIG. 5, the eccentricity detection is performed based on the rotational speed of the driving motor 12.

In detail, in step S51, the system microcomputer starts to control the drive motor 12 to the first setting RPM1. That is, the system microcomputer starts the acceleration motion of the drive motor 12 to perform the first eccentric detection section.

In step S52, the system microcomputer detects the speed of the drive motor 12, and continuously calculates the degree of speed increase and decrease from the detected speed. This rate of increase or decrease may be the sum of the differences of the pole values described above, or may be the average of the differences of the pole values. For example, in the case where the sum of the pole values is the sum, and the sum corresponds to the eccentricity according to the reference speed increase or decrease, the process proceeds to step S53. If it is less than that, the flow advances to step S54.

In step S53, since the eccentricity is generated during the acceleration section of the drive motor 12, the speed of the drive motor 12 is decelerated to a second set Rpm (rpm2) lower than the first set Rpm (rpm1) and controlled. do. While controlling to the second set RPM (rpm2) for a predetermined time, the process proceeds to step S51, and performs the acceleration section again.

In step S54, it is determined whether the current rotational speed rpm of the drive motor 12 has reached the first set RPM1. If the current rotational speed rpm has reached the first set RPM1, the process proceeds to step S55. Otherwise, the acceleration section of the drive motor 12 is continued, and the eccentricity detection according to step S52 is also performed during the performance of this acceleration section.

In step S55, eccentricity detection is performed. The system microcomputer calculates the amount of eccentricity according to a predetermined eccentric detection method.

In step S56, it is determined whether the cloth in the drum 8 is eccentric according to the amount of eccentricity detected in step S55, and if it is eccentric, the flow proceeds to step S53. If no eccentricity has occurred, the process proceeds to step S57.

In step S57, a main dehydration section is performed in which a substantial dehydration action is performed on moisture or the like contained in the fabric in the drum 8.

By the above-described steps S52 and S54, the eccentricity detection is performed even before reaching the first set RPM1 corresponding to the four-centre detection interval.

In addition, the step S53 is performed according to the eccentricity determination according to the steps S52 and S56, so that the acceleration to the first predetermined rpm can be performed within a shorter time, and the flow of the fabric is easy when the eccentricity fails. To be done.

However, the scope of the present invention is not limited by the above embodiments and drawings.

In the following, various aspects of the claimable invention are described. The following description forms part of a detailed description of the invention, and is a minimum of examples of the technical idea of the present invention or of a method of controlling a drum washing machine according to the present invention, which can be understood from various points of view. It should be understood as a description and not as a boundary limiting the present invention.

The control method of the drum washing machine according to the present invention according to claim 1 of the present invention comprises the steps of performing an eccentric detection section while maintaining a first speed by accelerating a drive motor, and when the eccentricity according to the eccentric detection section is greater than or equal to a set value, Including the step of decelerating the driving motor at the second speed, to have a short deceleration section from the first speed to the second speed, so that the subsequent eccentric detection section can be performed more quickly.

At the time of filing, the second speed described in claim 2 exceeds 0, thereby shortening the deceleration section from the first speed to the second speed.

The second speed described in claim 3 at the time of filing is the speed at which the cloth in the drum can flow, and facilitates the flow of the cloth in the event of an eccentric failure in the eccentric sensing section.

In the control method described in claim 4, the control method according to claim 4 maintains the deceleration operation for a predetermined time, and then re-executes the eccentric detection section, and a shortened acceleration section from the second speed to the first speed is performed, and then the eccentric detection section thereafter. Can be performed more quickly.

The control method according to claim 5 of the present application performs an initial eccentric detection section for detecting an eccentricity according to the speed information of the driving motor while accelerating the driving motor, so that the eccentricity detection is performed even in the acceleration section, and thus a walking phenomenon. Etc. can be prevented beforehand.

The speed information described in claim 6 at the time of application includes the speed increase / decrease associated with the eccentricity of the cloth in the drum, including the speed increase / decrease at the time of acceleration of the drive motor, so as to accurately calculate the degree of eccentricity.

The control method described in claim 7, wherein the control method according to claim 7 performs the deceleration operation step according to the execution result of the initial eccentric detection section or the execution result of the eccentric detection section, so that the plurality of eccentric detection methods are applied, Provides speed.

The control method of the drum washing machine according to the present invention according to claim 8 of the present invention comprises the steps of accelerating the drive motor, checking the increase and decrease of the speed of the drive motor during acceleration of the drive motor, and the eccentricity in the drum according to the increase and decrease degree. Determining the step.

The control method according to claim 9 of the filed claim includes the step of decelerating the speed of the drive motor to the first speed when the degree of increase or decrease is greater than or equal to the reference value in the determining step, so as to quickly determine the eccentricity without performing the eccentric detection section. Thus, the corresponding action can be taken.

The control method described in claim 10 of the filing claim includes performing an eccentric detection section while maintaining a constant speed of the driving motor when the degree of increase or decrease is less than the reference value in the determining step.

The present invention having such a configuration reduces the acceleration section and the deceleration section in the eccentric sensing section, thereby reducing the eccentric sensing time.

In addition, the present invention has the effect of solving the eccentricity through the deceleration at a speed at which the flow of the fabric in the drum is easy.

In addition, the present invention has the effect that the eccentricity detection is also performed in the acceleration section of the eccentric detection section, it is possible to prevent the walking phenomenon in the acceleration section.

Claims (10)

Accelerating the driving motor to perform an eccentric detection section while maintaining a first speed; When the amount of eccentricity according to the eccentric detection interval is more than the set value, the control method of the drum washing machine comprising the step of decelerating the drive motor at a second speed. The method of claim 1, The second speed is a control method of the drum washing machine, characterized in that more than zero. The method of claim 1, The second speed is a control method of the drum washing machine, characterized in that the speed in which the cloth in the drum can flow. The method of claim 1, The control method is a drum washing machine control method characterized in that the eccentric detection section is re-executed after maintaining the deceleration operation for a predetermined time. The method of claim 1, The control method of the drum washing machine, characterized in that during the acceleration of the drive motor, performing an initial eccentric detection section for detecting the eccentricity according to the speed information of the drive motor. The method of claim 5, The speed information includes a degree of speed increase and decrease at the time of acceleration of the drive motor. The method of claim 5, The control method of the drum washing machine, characterized in that for performing the deceleration operation step according to the result of performing the initial eccentric detection section or the result of the eccentric detection section. Accelerating the drive motor; Checking the degree of increase or decrease of the speed of the drive motor during acceleration of the drive motor; The control method of the drum washing machine comprising the step of determining the eccentricity in the drum according to the degree of increase and decrease. The method of claim 8, The control method includes controlling the drum washing machine to reduce the speed of the driving motor to the first speed when the degree of increase or decrease is greater than or equal to the reference value in the determining step. The method of claim 8, The control method of the drum washing machine comprising the step of performing an eccentric detection section while maintaining a constant speed of the drive motor when the degree of increase and decrease is less than the reference value in the determining step.

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