KR20050042945A - Method for detecting unbalance of washing machine - Google Patents

Abstract

The present invention relates to a method for detecting an eccentricity of a drum washing machine, and to reduce the number of eccentric detection and shorten the time required for eccentric detection.

The eccentric detection method of the drum washing machine according to the present invention for this purpose, the first step of detecting the amount of laundry by rotating the drum at a predetermined speed; A second step of accelerating the drum rotation speed at a set eccentric detection speed (RPM) to perform primary eccentricity detection; A third step of accelerating the drum rotation speed at the set speed RPM; A fourth step of performing a second eccentricity detection by decelerating a drum rotation speed to the set eccentricity detection speed (RPM); After the detection of the second eccentricity, the amount of eccentricity is compared with a preset eccentricity allowance, and when the eccentricity is less than or equal to the eccentricity allowance, the dehydration is entered. If the eccentricity is exceeded, the steps 2, 3 and 4 are sequentially performed. Characterized in that it comprises a fifth step to perform repeatedly.

Description

Method for detecting eccentricity of drum washing machine

The present invention relates to a drum washing machine, and more particularly, to an apparatus and method for detecting a quantity / eccentricity of a drum washing machine for improving washing performance.

In general, the drum washing method is a method of washing the laundry using the friction force of the rotating drum and the laundry by receiving the driving force of the motor in a state in which detergent, washing water and laundry are put in the drum, there is almost no damage to the laundry, laundry These don't get tangled with each other and can have a pounding and scrubbing wash effect.

A general drum washing machine using the drum washing method as described above will be briefly described with reference to FIG. 1.

As shown in FIG. 1, a tub 2 is installed inside the cabinet 1, a drum 3 is rotatably installed in the center of the tub 2, and a lower portion of the tub 2 is provided. A motor 4 is installed at one side and a motor pulley 41 is axially connected to the motor 4.

In addition, a drum shaft 32 is installed at the rear of the drum 3, and a drum pulley 31 is installed at the drum shaft 32 so that the drum pulley 31 is driven by a belt 5 which is a power transmission element. It is linked with the motor pulley 41 connected to (4).

In addition, a door 6 is installed in front of the cabinet 1, and a gasket 7 is installed between the door 6 and the tub 2.

On the other hand, a spring 9 for supporting the tub 2 in a floating state is installed between both side portions inside the upper surface of the cabinet 1 and an upper portion of the outer peripheral surface of the tub 2, and both sides of the lower surface of the cabinet 1. A damper 8 is installed between the corner portion and both sides of the lower portion of the outer peripheral surface of the tub 2 to support the drum 3 and to absorb vibrations of the tub 2 generated by the rotation of the drum 3 when dewatering. To attenuate.

At this time, the dampers 8 are symmetrically installed on both sides of the lower part of the tub 2, and the lower end of each damper 8 is installed on the base surface 11 forming the lower surface of the cabinet 1 (not shown). Is omitted) and is fixed by fastening means such as bolts and nuts.

Conventional drum washing machine configured as described above to detect the eccentricity of the laundry inside the washing tank at the beginning of the dehydration stroke to suppress the vibration caused by the eccentricity.

The eccentricity sensing method performed in the conventional drum washing machine will be briefly described with reference to the graph of FIG. 2.

At the end of the washing stroke and entering the dehydration stroke, the rotation speed of the drum 3 is raised to about 100 RPM twice and stopped after a constant speed driving for a predetermined time, and the amount of laundry, that is, the quantity of the laundry is measured.

After measuring the amount of water, the rotation speed of the drum 3 is again increased to about 100 RPM to perform the first eccentricity detection, and then the speed of rotation is increased to 250 RPM so that the laundry floating in the air in the center of the drum adheres to the drum surface.

As such, the reason for attaching the laundry to the drum surface by raising the drum rotation speed to 250 RPM is that if the fast dehydration is performed without the laundry in the drum center part attached to the drum surface, the laundry floating in the middle collides with the wall and the eccentricity increases. This is because vibration and noise are severely generated.

After performing the first eccentricity detection as described above and rotating the drum at 250 RPM, and performing the second eccentricity detection with the drum rotational speed of approximately 100 RPM again, the drum rotational speed is increased to 500 RPM again to remove the moisture of the laundry. Pull it out.

The reason for increasing the drum rotation speed to 500 RPM after the second eccentricity detection is to suppress the increase in the amount of eccentricity according to the difference in water absorption of the laundry by reducing the moisture absorbed in the laundry.

As described above, the second eccentricity detection is performed, and the drum is rotated at 500 RPM, and the drum is rotated about 100 RPM again to perform the third eccentricity detection.

The conventional drum washing machine performs the above-described 1, 2, 3 eccentricity detection, and enters the dehydration when the eccentricity falls within the set allowable eccentricity value range. The above 1, 2, 3 eccentric detection is repeated several times until the eccentricity is allowed.

However, the conventional drum washing machine as described above has a problem that it takes a long time for the eccentricity detection because the eccentricity detection is carried out three times.

In addition, during the detection of the eccentricity, after the second eccentricity detection, the drum rotation speed is increased to 500 RPM to extract water from the laundry. It does not fall well and the ability to disperse the laundry is lowered, which increases the eccentricity detection time, which is a factor that inhibits the reduction of the amount of eccentricity.

In addition, conventionally, the eccentricity tolerance is always applied the same regardless of the amount of dose. Even in the case of a small amount that is less influenced by the eccentricity, the eccentricity detection is performed in the same manner as in the case of a large amount. This increases the time.

Accordingly, an object of the present invention is to provide an eccentric detection method of a drum washing machine that can reduce the number of eccentric detection and shorten the time required for eccentric detection.

Eccentricity detection method of the drum washing machine according to the present invention for achieving the above object, the first step of detecting the amount of laundry while rotating the drum at a predetermined speed; A second step of accelerating the drum rotation speed at a set eccentric detection speed (RPM) to perform primary eccentricity detection; A third step of accelerating the drum rotation speed at the set speed RPM; A fourth step of performing a second eccentricity detection by decelerating a drum rotation speed to the set eccentricity detection speed (RPM); After the detection of the second eccentricity, the amount of eccentricity is compared with a preset eccentricity allowance, and when the eccentricity is less than or equal to the eccentricity allowance, the dehydration is entered. If the eccentricity is exceeded, the steps 2, 3 and 4 are sequentially performed. And a fifth step of performing repetition.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the eccentric detection method of the drum washing machine according to the present invention will be described in detail.

3 and 4 are diagrams illustrating a method for detecting an eccentricity of a drum washing machine according to the present invention. When the washing stroke is completed, the drum is rotated to approximately 100 RPM and stopped twice to detect a quantity of water. (Step S1)

After detecting the quantity of water, the speed of the drum is accelerated to 108 RPM, which is the set eccentric detection speed, and then, while driving at a constant speed for a predetermined time, the first eccentricity detection is performed (step S2), and then the drum speed is increased to 400 RPM. (Step S3).

When the rotation speed of the drum is raised to 400 RPM as described above, the laundry floating in the middle of the drum is attached to the drum surface and water absorbed by the laundry is discharged to some extent, at which time the laundry adheres to the drum surface. It is lowered than when the water is increased to the existing 500RPM, so that the laundry can be better dispersed during the next eccentric detection.

When the step S3 is finished, the drum rotation speed is further reduced to 108 RPM, and the second eccentricity detection is performed by performing the second eccentricity detection while driving at a constant speed for a predetermined time (step S4).

Then, by comparing the first and second eccentricity calculated by the first and second eccentricity detection with the preset eccentricity allowance (step S5), when the eccentricity is within the set eccentricity allowance value, the drum rotation speed is increased. After entering the dehydration stage (step S6), when the eccentricity exceeds the set allowable eccentricity range, the drum speed is reduced to zero, and the above steps S2, S3, S4 and S5 are performed in sequence.

As described above, according to the present invention, since the eccentricity detection is performed only two times per one or two times, the time required for the eccentricity detection can be greatly reduced than when the conventional three-steps are performed.

On the other hand, when performing the eccentric detection in the second step as described above, it is preferable to set the eccentricity allowable value as the amount of the detected amount in the step S1 is smaller, which is a small amount, the dehydration at the final dehydration rate when the eccentric amount is a little This is because the vibration does not significantly affect the noise.

Quantity / desired spin speed 1550 1360 1200 1000 800 600 400 much Primary tolerance 35 40 45 50 55 55 55 Secondary tolerance 40 45 50 55 60 60 60 multiple Primary tolerance 40 45 50 55 60 60 60 Secondary tolerance 45 50 55 60 65 65 65 weight Primary tolerance 50 55 60 65 70 70 70 Secondary tolerance 50 55 60 65 70 70 70 Small Primary tolerance 60 65 70 75 80 80 80 Secondary tolerance 55 60 65 70 75 75 75 handful Primary tolerance 65 70 75 80 85 85 85 Secondary tolerance 60 65 70 75 80 80 80 Single load Primary tolerance 150 155 160 165 170 170 170

For example, as shown in Table 1 above, the quantity is divided into large quantities, multiples, weights, small to medium, small amounts, single load, etc., and the first and second eccentricity allowance when the desired dehydration rate is large quantities at 1550 RPM The values can be set to 35 and 40 respectively, and the first and second eccentricity allowances can be set to 50 and 50, respectively, in case of small doses, and the first and second eccentricity allowances to 65 and 60, respectively, in case of small doses. .

In addition, it is possible to reduce the amount of eccentricity and shorten the eccentricity detection time by varying the inclination of acceleration to the rotational speed for eccentricity detection according to the quantity. In the case of a large amount, the eccentricity detection time can be shortened by increasing the acceleration slope to reach the eccentricity detection speed as fast as possible.

In the above-described embodiment, the drum rotational speed for performing eccentricity detection is 108 RPM, and the drum rotational speed for draining water after detection of the first eccentricity is described as 400 RPM, but is not necessarily limited to these rotational speeds, and the like. Depending on a number of other factors, the manufacturer may randomly choose the speed at which optimal eccentricity detection can be performed.

As described above, according to the present invention, since the eccentricity detection is performed twice each time, the eccentricity detection time can be significantly shortened than when the eccentricity detection is performed over the existing three times.

In addition, since the eccentricity detection value is set differently according to the quantity, there is an effect that the eccentricity detection time can be further shortened.

1 is a cross-sectional view of main parts schematically showing the configuration of a general drum washing machine.

2 is a graph illustrating an eccentricity detection and dehydration process of a conventional drum washing machine

3 is a flow chart illustrating an eccentric detection method according to the present invention.

4 is a graph illustrating an eccentricity detection and dehydration progression process according to the present invention.

Claims (7)

A first step of rotating the drum at a predetermined speed and sensing a quantity of laundry; A second step of accelerating the drum rotation speed at a set eccentric detection speed (RPM) to perform primary eccentricity detection; A third step of accelerating the drum rotation speed at the set speed RPM; A fourth step of performing a second eccentricity detection by decelerating a drum rotation speed to the set eccentricity detection speed (RPM); After the detection of the second eccentricity, the amount of eccentricity is compared with a preset eccentricity allowance, and when the eccentricity is less than or equal to the eccentricity, the dehydration enters the dehydration. Eccentricity detection method of the drum washing machine comprising a fifth step to be repeated. The eccentric detection method of a drum washing machine according to claim 1, wherein the set speed of the third step is 400 RPM. The method of claim 1, wherein the first and second eccentric detection speed of the drum washing machine, characterized in that 108RPM. The method of claim 1, wherein the eccentricity allowance value of the fourth step is set differently according to the detected quantity in the first step. The eccentric detection method of a drum washing machine according to claim 4, wherein the smaller the quantity, the larger the allowable value of the eccentricity. The method of claim 1, wherein the acceleration slope for accelerating to the eccentric detection speed (RPM) is set differently in the second step according to the detected quantity in the first step. The eccentric detection method of the drum washing machine according to claim 6, wherein the smaller the detected quantity is, the smaller the acceleration gradient is.