KR20080085392A - Controlling method for drum washer - Google Patents

Abstract

A method for controlling a frontloading washer is provided to perform a main dehydration process based on the accurate amount of laundry by sensing the amount of laundry while detecting eccentricity of the washing machine. A method for controlling a frontloading washer comprises the steps of: intermittently dehydrating laundry; sensing the amount of laundry after the intermittent dehydration process; and sensing eccentricity based on the sensed amount of laundry.

Description

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

1 is a graph showing the drum speed with time during the dehydration stroke in a conventional drum washing machine.

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

3 is a graph showing the speed of the drive motor or the speed of the drum with time during the dehydration stroke in the drum washing machine performed according to the control method of the drum washing machine according to the present invention.

FIG. 4 is a graph illustrating a principle of detecting a quantity in FIG. 3.

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

<Description of the 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 detect a quantity of gas in the execution of the eccentricity detection, so that more accurate eccentricity and quantity detection can be made.

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 drum speed with time during the dehydration stroke in a conventional drum washing machine.

Looking at the dewatering method of the drum washing machine according to the prior art as follows. The dewatering method of the drum washing machine includes a quantity detection step of detecting a quantity of laundry cloth for dewatering to determine an optimal dehydration time or a dehydration ALPM, and an eccentric detection step of detecting an eccentricity to determine the entry or inflation of main dehydration. And, after the capacity detection or eccentricity detection is made of a main dehydration step of controlling the motor at high speed.

As shown in FIG. 1, when the washing or rinsing stroke is completed, a quantity detection step in which two quantity detections are performed, and one or more eccentric detections are sequentially performed.

The amount of detection period accelerates the motor or drum to reach the first set rpm (rpm1), and when the first set ALPM (rpm1) is reached, the motor or drum is decelerated and then controlled.

The eccentric detection section accelerates the motor or drum to reach the second set Rpm (rpm2) larger than the first set rpm (rpm1), and maintains the second set Rpm (rpm2) when the second set rpm (rpm2) is reached. After deceleration control the motor or drum. In the eccentric detection section, the first intermittent dehydration is performed according to the first eccentric detection result according to the detected quantity in the quantity detection section. In addition, after performing the first intermittent dehydration by accelerating the speed of the drum to the third set RMP3, the second eccentricity detection is performed according to the detected quantity in the quantity detection section, and according to the second eccentricity detection result. Perform secondary intermittent dehydration. In addition, after performing the second intermittent dehydration by accelerating the speed of the drum to the fourth set ALPM (rpm4), the third eccentricity detection is performed according to the detected quantity in the quantity detection section, and according to the third eccentricity detection result. Perform main dehydration.

In this series of processes, in the amount of water detection section, in addition to the water absorbed by the fabric, the residual water not absorbed by the fabric is present in the drum. Therefore, the quantity of the quantity detected in the quantity detection section includes the weight of moisture and residual water absorbed by the fabric. Since the eccentricity is detected and the dehydration is performed according to the amount of such an error, the accuracy of the eccentricity detection is lowered, and the dehydration is performed based on more than the actual amount.

In order to solve this problem, it is an object of the present invention to provide a control method of a drum washing machine to detect a quantity during the detection of the eccentricity, so that a more accurate quantity detection.

In addition, an object of the present invention is to provide a control method of a drum washing machine using a section made at the time of the existing dehydration stroke, without a great change to the existing dewatering algorithm.

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 is driven. The rotation speed (rpm) is calculated according to the rotation speed of the motor 12.

3 is a graph showing the speed of the drive motor or the speed of the drum with time during the dehydration stroke in the drum washing machine performed according to the control method of the drum washing machine according to the present invention.

In detail, during the dehydration stroke, the quantity detection section is first performed. After the rotational speed of the drive motor 12 reaches the first set rpm (rpm1), the quantity of the drum 8 is sensed while maintaining a fixed time. This dose detection interval performs two dose detections (or dose calculations) as shown.

The eccentric detection section is started on the basis of the quantity detected in the detection section. First, in order to detect the primary eccentricity, the rotational speed of the driving motor 12 is increased to the second predetermined rpm, and the eccentricity is sensed while maintaining the second predetermined rpm. Primary intermittent dehydration is performed as a result of primary eccentricity detection. The first intermittent dehydration is performed by accelerating the speed of the drive motor 12 to the third set rpm. The primary intermittent dehydration (and the second intermittent dehydration) reduces the noise that may occur when water remaining in the drum or the residual water in the drum 8 escapes all at once in the initial dehydration operation, and reduces the load applied to the drive motor 12. It is to reduce.

Termination of the primary intermittent dehydration is achieved by interrupting the supply of power to the drive motor 12. The end of this primary intermittent dehydration is that the drive motor 12 continues the rotational motion by the drum 8 and the artillery in the drum 8, ie inertia (or inertial motion). After the end of the primary intermittent dehydration, the system microcomputer does not have direct control over the drive motor 12 and the drum 8. The system microcomputer does not control the rotation of the drive motor 12 until the rotation speed of the drive motor 12 reaches the fifth set RPM5.

Once the rotational speed of the drive motor 12 reaches the fifth set ALPM (rpm5), the elapsed time (tm) from the end of the first intermittent dehydration to the fifth set ALPM (rpm5) is calculated. In other words, in the primary dose detection section, the amount of load in the drum 8 is detected or calculated according to this elapsed time tm. The inertial motion of the drum 8 and the drive motor 12 is influenced by the amount of mass in the drum 8, so that the rotational speed of the drive motor 12 decreases with time in inverse proportion to the amount of quantity. That is, when the quantity is large, the rotational speed of the drive motor 12 is relatively slow, and when the amount is small, the rotational speed of the drive motor 12 is relatively fast. As a result, the elapsed time when the amount is large has a larger value than the elapsed time when the amount is small. Depending on the nature of these inertial motions, the amount of detection or detection of the quantity is estimated. In this step, the system microcomputer initiates control of the rotation of the drive motor 12 to control the rotational speed of the drive motor 12 to be reduced to the second set RPM2.

When the rotational speed of the drive motor 12 is reduced to the second set RPM2, the secondary eccentricity detection section is performed. In the second eccentricity detection section, the eccentricity detection is performed based on the quantity detected in the first dose detection section. That is, the eccentricity detection is performed in the second eccentricity detection section according to the relatively accurate amount of water reflecting the amount of water reduced by the primary intermittent dehydration.

Secondary intermittent dehydration is performed as a result of secondary eccentricity detection. Secondary intermittent dehydration is performed by accelerating the speed of the drive motor 12 to a fourth set rpm (rpm4) larger than the third set rpm (rpm3). The secondary intermittent dewatering is to reduce the noise that may occur when water contained in the residual water or cloth in the drum 8 escapes all at once in the initial dehydration operation, and to reduce the load on the driving motor 12.

Termination of the secondary intermittent dehydration is performed by interrupting the supply of power to the drive motor 12 in the same way as the termination of the primary intermittent dehydration. The end of this secondary intermittent dehydration is that the drive motor 12 continues the rotational motion by the drum 8 and the fabrics in the drum 8, that is, inertia (or inertia). After the end of the secondary intermittent dehydration, the system microcomputer does not have direct control over the drive motor 12 and the drum 8. The system microcomputer does not control the rotation of the drive motor 12 until the rotation speed of the drive motor 12 reaches the fifth set RPM5.

When the rotational speed of the drive motor 12 reaches the fifth set ALPM (rpm5), the elapsed time (tm) from the end of the second intermittent dewatering to the fifth set ALPM (rpm5) is calculated. In other words, in the secondary dose detection section, the amount of load in the drum 8 is detected or calculated again according to this elapsed time tm. The inertial motion of the drum 8 and the drive motor 12 is influenced by the amount of mass in the drum 8, so that the rotational speed of the drive motor 12 decreases with time in inverse proportion to the amount of quantity. That is, when the amount is large, the rotational speed of the drive motor 12 is relatively slow, and when the amount is small, the rotational speed of the drive motor 12 is relatively fast. As a result, the elapsed time when the amount is large has a larger value than the elapsed time when the amount is small. Depending on the nature of this inertial motion, the amount of monitoring is calculated or calculated. In this step, the system microcomputer initiates control of the rotation of the drive motor 12 to control the rotational speed of the drive motor 12 to be reduced to the second set RPM2.

When the rotational speed of the drive motor 12 is reduced to the second set rpm (rpm2), the third eccentric detection section is performed. In the third eccentricity detection section, the eccentricity detection is performed based on the quantity detected in the second quantity detection section. That is, the eccentricity detection is performed in the third eccentricity detection section according to the relatively accurate amount of water reflecting the amount of water further reduced by the secondary intermittent dehydration.

Thereafter, the main dehydration section is performed according to the eccentricity result according to the third eccentric detection section.

As described above, the control method of the drum washing machine according to the present invention uses an eccentric detection section that is performed in the existing dehydration stroke, but the first and second intermittent dehydration section made in the eccentric detection section And second dose detection intervals, respectively.

FIG. 4 is a graph illustrating a principle of detecting a quantity in FIG. 3. As shown in FIG. 4, in the first intermittent dehydration section, after the rotational speed of the drive motor 12 reaches the third set RPM3, the drive motor 12 is terminated by the end of the first hepatic dehydration section. Speed is reduced. The degree of this reduction (acceleration) is related to the inertial motion, which is related to the amount of mass in the drum 8. Thus, in the first dose detection interval, if the elapsed time (tm) is within the reference elapsed time (X), the small amount is detected or calculated, and if the elapsed time (tm) is more than the reference elapsed time (Y), If a large amount is detected or calculated and the elapsed time (tm) is in the range of the reference elapsed time (X) to the reference elapsed time (Y), the quantity is detected or calculated by weight.

As shown in FIG. 4, the amount of bulk can be divided into a small amount, a weight, and a large amount of steps, and the reference elapsed time (X) and (Y) can be divided into more steps.

In addition, the case of FIG. 4 relates to a dose after the first intermittent dehydration section, and another reference elapsed time may be applied to the second dose detection section after the second intermittent dewatering section. That is, a more accurate dose can be detected and calculated by the secondary dose detection interval.

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

In detail, in step S51, after starting a dehydration stroke, an intermittent dewatering section is performed. Referring to Figure 3, the first intermittent dehydration section is performed preferentially. That is, the intermittent dehydration section is performed so that the rotational speed of the drive motor 12 reaches the third set RPM3.

In step S52, when the intermittent dehydration section ends, the power supply to the drive motor 12 is cut off, so that the drum 8 continues to rotate in an inertial motion. However, the rotation speed of the drum 8 is reduced.

In step S53, the inertia motion of the drum 8 is continued until the current rotational speed of the drive motor 12 reaches the fifth set RPM5. When the rotational speed of the drive motor 12 reaches the fifth set RPM5, the process proceeds to step S54.

In step S54, the elapsed time (tm) from the end of the intermittent dehydration section until the fifth set RPM5 is reached is calculated.

In step S55, the amount of discharge in the drum 8 is sensed and estimated as described above in comparison with the estimated elapsed time tm and the reference elapsed time X and Y.

In step S56, the second eccentric detection section, which is the eccentric detection section, is performed on the basis of the quantity in the drum 8 detected and calculated in step S55.

In step S57, it is determined whether there is an additional intermittent dehydration section according to the result of the second eccentric detection section in step 56. If there is an additional intermittent dehydration section, the flow proceeds to step S51. Otherwise proceed to step S58. In the present embodiment, since the secondary intermittent dehydration section remains, the flow advances to step S51 to perform steps S51 to S56.

In step S58, according to the result of the eccentric detection of the eccentric detection section of step S56, the dehydration section is performed to allow substantial dehydration of the fabric. Here, even when the main dehydration section is performed, dehydration according to the detected and calculated amount of water can be performed accurately according to the execution of the secondary dose reduction section. That is, the main dewatering according to the rotational speed according to the correct amount of water can be performed, thereby improving the efficiency of the power.

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 as claimed in claim 1 of the present invention comprises the steps of performing an intermittent dehydration section, performing a quantity detection after performing the intermittent dewatering section, and based on the detected amount of eccentricity. Including the step of performing a detection interval, by performing a dose detection after the intermittent dehydration interval, it is possible to perform the eccentric detection interval and the subsequent dehydration according to the more accurately detected dose.

The control method according to claim 2 of the application claims is carried out in the non-control section for the rotation of the drum to perform the dose detection step, so that the dose detection is made without additional power supply for the dose detection.

The quantity detection step according to claim 3 of the filed claim determines the quantity when the speed of the motor reaches a set value, so that the quantity of detection corresponding to the quantity of the drum and the quantity in the drum is made.

In the filed detection step according to claim 4, the quantity of the drum is determined according to the time required for the speed of the motor to reach the set value after the intermittent dehydration section. It can be judged simply. The speed setting value for the dose detection according to claim 5 at the time of filing is set to be larger than the speed setting value of the eccentric detection section, so that the dose is detected before the eccentric detection section.

The control method of the drum washing machine of the present invention according to claim 6 of the present invention comprises the steps of controlling the rotation of the drum at a first set speed, and after the end of the rotation control of the drum, the speed of the motor reaches the second set speed. Calculating the amount of time until the following; and calculating the amount of quantity in the drum according to the calculated amount of time.

The termination of the rotational control with respect to the drum according to claim 7 in the application allows the drum to inertial motion so that the quantity is sensed without supplying additional power.

The estimating step of the quantity according to claim 8 at the time of filing is to calculate the quantity by comparing the prestored reference elapsed time and the calculated time, and the degree according to the prestored reference elapsed time (large amount, weight, small amount, etc.) It is possible to estimate the quantity with.

The present invention having such a configuration has an effect of detecting a dose even during eccentric detection, so that a more accurate dose detection is achieved.

In addition, the present invention has the effect of making more accurate dose detection and eccentricity detection using the section made during the existing dehydration stroke, without large variation on the existing dewatering algorithm.

In addition, the present invention has the effect that the main dehydration according to the correct amount of carried out in the dehydration section to be carried out later, by the detection of the correct amount of.

Claims (8)

Performing an intermittent dehydration section; Performing a dose detection after performing the intermittent dehydration section; The control method of the drum washing machine comprising the step of performing an eccentric detection section based on the detected quantity. The method of claim 1, The control method is a control method of a drum washing machine, characterized in that performing the quantity detection step in the non-control section for the rotation of the drum. The method of claim 1, A quantity detection step is a control method of a drum washing machine, characterized in that for determining the quantity of the quantity of the motor when the speed reaches a set value. The method of claim 1, The quantity detection step of the drum washing machine control method characterized in that after the execution of the intermittent dehydration section, the determination of the amount of the quantity determined according to the time required for the speed of the motor to reach the set value. The method according to any one of claims 1 to 4, Speed setting value for the detection of the quantity of the drum washing machine control method characterized in that the larger than the speed setting value of the detection interval. Rotating the drum at a first predetermined speed; Calculating a time until the speed of the motor reaches the second set speed after ending the rotation control with respect to the drum; And estimating a quantity in the drum according to the estimated time. The method of claim 6, The end of the rotation control with respect to the drum is a quantity detection method of the drum washing machine, characterized in that the drum inertial motion. The method of claim 6, The calculating step of the amount of the amount of detection of the drum washing machine, characterized in that for calculating the amount of capacity, by comparing the pre-stored reference elapsed time and the calculated time.

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