KR20080085394A - Controlling method for drum washer - Google Patents

Abstract

A method for controlling a frontloading washer is provided to simplify a dehydration process and reduce power consumption by sensing a single or extremely small load at an initial stage of the dehydration process. A method for controlling a frontloading washer comprises the steps of: controlling a motor based on a certain duty; sensing RPM of the motor with respect to the certain duty; comparing the sensed RPM of the motor with a set RPM; and sensing the eccentricity or the amount of laundry in accordance with the result.

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 according to the prior art.

2 is a flow chart of a control method of a drum washing machine according to the prior art.

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

4 is a configuration diagram of a control apparatus of a drum washing machine for performing the control method of the drum washing machine according to the present invention.

5 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.

6 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 perform a detection for a single load or a very small load, thereby simplifying the dewatering stroke.

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, washing by the dropping force and the interaction with the wash water. The contamination of the gun is removed.

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 according to the prior art.

As shown in FIG. 1, a dose detection interval for a gun in a drum is performed while maintaining the drum's speed (or motor's speed) at rpm −1.

Next, the speed of the drum (or the speed of the motor) is maintained at rpm-2 to detect whether the gun is eccentric with respect to the gun in the eccentric detection zone, according to the detected dose in this gun detection zone. If the measured value of the eccentricity is greater than or equal to the set value in the first eccentric detection section of the eccentric detection section, the second eccentric detection section is performed. When the Nth eccentric detection section fails in this order, it is determined that the carriage in the drum is a single load or a very small load.

2 is a flow chart of a control method of a drum washing machine according to the prior art.

In step S21, a dose detection interval for the gun in the drum is performed.

In step S22, the eccentric detection section is performed according to the detected quantity in the amount detecting section performed in step S21. Here, the eccentricity detection section is the first eccentricity detection.

In step S23, it is determined whether the eccentricity value detected in step S22 is in the normal range. If the eccentric value is larger than the set value, it is determined that the eccentricity is caused, and the flow proceeds to step S24. If the eccentric value is less than the preset value, the flow proceeds to step S26.

In step S24, when the number of failures in the eccentricity detection interval is less than the reference failure number (for example, N times), the process proceeds to step S22 to perform additional eccentricity detection. If the number of failures in the eccentricity detection interval is greater than or equal to the reference failure number, the process proceeds to step S25.

In step S25, the baggage in the drum is determined to be a single load or a very small load and proceeds to step S22, so that the eccentric sensing section according to the single load or the very small load is performed.

In step S26, the main dehydration section is performed so that the drum is rotated at a high speed so that dehydration is performed.

In the control method of the drum washing machine according to the related art, when the cloth in the drum is a single load or a very small load, steps S22 to S24 are repeatedly performed for this determination, so that step S25 is performed. Therefore, the control method of the drum washing machine according to the related art proceeds to the main dehydration section since the eccentricity detection and the dehydration are performed according to the determination of the amount of the drum in the drum only after a lot of time according to the execution of many steps. There is a problem that takes a long time to do.

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 reduce the entry time of the main dehydration section by first determining whether a single load or a very small load.

In addition, an object of the present invention is to provide a control method of a drum washing machine to detect a single or very small load at the beginning of the dehydration stroke, simplify the dewatering stroke and reduce power consumption.

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

3 is a cross-sectional view of a drum washing machine to which the present invention is applied. As shown in FIG. 3, the drum washing machine 1 can be buffered by a cabinet 2 forming an 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 linked 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).

4 is a configuration diagram of a control apparatus of a drum washing machine for performing the control method of the drum washing machine according to the present invention.

In FIG. 4, when the user selects and inputs a desired washing course (for example, a washing stroke or a dehydration stroke), the driving unit 80 outputs an electric key signal corresponding thereto, and the speed detecting unit 90 The speed of the driving motor (for example, the universal motor) 12 is sensed and a corresponding speed detection signal is output. The speed sensing unit 90 may be formed of, for example, a hall sensor.

In addition, the system microcomputer 50 controls the overall operation of the drum washing machine, and determines the speed control signal for adjusting the speed of the drive motor 12 (or the speed of the drum 8) and the drive motor 12. And outputs a switching control signal for reverse rotation, and the triac 72 is turned on or off by the speed control signal from the system microcomputer 50 to supply or cut off the commercial AC power from the power supply unit 60. This speed control signal consists of a pulse width modulation (PWM) signal.

Then, the first relay 74 and the second relay 76 are switched by the switching control signal from the system microcomputer 50 to rotate the drive motor 12 forward and reverse, and the power supply unit 60 rotates the drum. Supply commercial AC power required to drive the washing machine.

In addition, the rectifier 78 rectifies the DC voltage from the commercial AC power input from the power supply unit 60, and the drive motor 12 is driven by receiving a predetermined DC voltage from the rectifier 78 to fix the drum 8. The reverse rotation includes the rotor 12a and the stator 12b.

The controller of the drum washing machine configured as described above inputs a desired washing course (for example, a dehydration stroke) through the driving control unit 80, and then operates the start key. The key signal is output to the system microcomputer 50.

The system microcomputer 50 receives a key signal and outputs a speed control signal for adjusting the speed of the drive motor 12 (or the speed of the drum 8) to the triac 72 and at the same time the drive motor 12. Outputs a switching control signal for forward rotation to the first and second relays 76, respectively, and the triac 72 is turned on by the speed control signal so that the commercial AC power supply from the power supply unit 60 is rectified. ), The first and second relays 76 are switched to the terminal A by the switching control signal, and the second relay 76 is switched to the D terminal.

Next, the rectifier 78 rectifies and outputs a commercial AC power supply with a DC voltage, and the DC voltage of the drive motor 12 passes through the A terminal of the first relay 74 and the D terminal of the second relay 76. The drive motor 12 is driven in the forward rotation as the rotor 12a and the stator 12b are supplied, and as the drive motor 12 is driven in the forward rotation, the drum 8 rotates forward to perform a dehydration stroke. .

On the other hand, when the system microcomputer 50 outputs the switching control signals for the reverse rotation of the drive motor 12 to the first and second relays 76, respectively, the first and second relays 76 are connected to the switching control signals. As a result, the first relay 74 is switched to the B terminal, and the second relay 76 is switched to the C terminal.

Next, the DC voltage rectified by the rectifying unit 78 passes through the B terminal of the first relay 74 and the C terminal of the second relay 76 to the rotor 12a and the stator 12b of the drive motor 12. As it is supplied to the drive motor 12 is driven in reverse rotation, as the drive motor 12 is driven in reverse rotation the drum 8 is rotated in reverse to perform a dehydration stroke.

In addition, the speed detection unit 90 detects the speed (speed) of the driving motor 12 and outputs a corresponding speed detection signal to the system microcomputer 50, and the system microcomputer 50 receives the speed detection signal. The speed control signal for adjusting the speed of the drive motor 12 is output to the triac 72.

Next, the triac 72 is turned on or off by the speed control signal so that the phase of the commercial AC power is controlled as the commercial AC power from the power supply 60 is supplied or cut off to the rectifier 78. The drive motor 12 is driven to regulate the speed of the drum 8.

5 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.

As shown in FIG. 5, in the initial stage of the dehydration stroke of the drum washing machine, a sensing section of a single load or a very small load is performed. The system microcomputer 50 stores the reference rotational speed (rpm2) of the drum 8 or the driving motor 12 for the set duty, generates a speed control signal according to the set duty, and applies the triac 72 to the drive. The motor 12 controls to perform rotation according to the set duty.

Here, the system microcomputer 50 generates the speed control signal according to the set duty, not the speed control signal according to the general speed command. That is, in the case of the general speed command, the system microcomputer 50 receives the rotation speed of the drive motor 12 from the speed detection unit 90 and does not perform the control to gradually increase the rotation speed to match the speed command. The system microcomputer 50 generates a speed control signal according to the set duty, and performs only a process of receiving the rotational speed of the driving motor 12 according to the set duty from the speed detecting unit 90.

When the rotational speed is higher than the reference rotational speed (rpm2), the system microcomputer 50 determines that it is a single load or a very small load, omits the quantity detection section and immediately enters the eccentric detection section. For example, when the rotational speed of the drive motor 12 is rpm 3, the system microcomputer 50 determines that the carriage in the drum 8 is a single load or a very small load.

When the rotation speed is lower than or equal to the reference rotation speed (rpm2), the system microcomputer 50 determines that the load is not a single load or a very small load, and performs a dose detection section, thereby entering the eccentric detection section. For example, when the rotational speed of the drive motor 12 is rpm1, the system microcomputer 50 determines that the carriage within the drum 8 is not a single load and a very small load.

Detecting and determining a single load or a very small load on the basis of the rotational speed of the driving motor 12 or the drum 8 with respect to the set duty, when the carriage in the drum 8 is a single load or a very small load, This is possible because the reaction speed of the drum 8 is relatively high.

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

In detail, in step S61, the system microcomputer 50 applies a speed control signal corresponding to a previously stored set duty to the triac 72, and controls the first and second relays 74 and 76 to drive the same. By allowing the motor 12 to perform a rotational movement, it performs a sensing section of a single load or a very small load. At this time, the system microcomputer 50 applies the same speed control signal to the triac 72 for a set time, so that the drive motor 12 is sufficiently responsive to the speed control signal to move at the rotational speed accordingly.

In step S62, the system microcomputer 50 compares the rotational speed of the drive motor 12 with the reference rotational speed rpm 2 according to the speed detection signal input from the speed detection unit 90. If the rotational speed of the drive motor 12 is greater than the reference rotational speed (rpm2), the flow proceeds to step S63; otherwise, if the rotational speed of the drive motor 12 is equal to or less than the reference rotational speed (rpm2), the step Proceed to S64.

In step S63, the system microcomputer 50 determines that the carriage in the drum 8 is a single load or a very small load. Accordingly, the system microcomputer 50 directly proceeds to step S66 without performing the dose detection section.

In step S64, the system microcomputer 50 determines that the carriage in the drum 8 is a non-single load or a small amount or more of load, and the flow proceeds to step S65 to perform a dose detection section.

In step S65, the system microcomputer 50 performs a dose detection interval for the guns in the drum 8.

In step S66, the system microcomputer 50 performs an eccentricity detection section according to a single load or a very small load when the system microcomputer 50 proceeds from step S63, and performs the eccentricity detection section according to the case where the system microcomputer 50 proceeds from step S65. .

In step S67, the system microcomputer 50 performs the main dehydration section when there is no eccentricity in the fabric in the drum 8.

The above-described step (S63) allows the eccentricity detection section to be performed without performing a separate dose detection section at the same time as performing the determination on the single load or the very small load, thereby simplifying the dehydration stroke, Allow the dehydration section to be performed.

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 claim 1 of the present application is a control method of the drum washing machine performed before the main dehydration section, the method comprising the steps of controlling the motor by a certain duty, and detecting the speed of the motor relative to the duty And comparing the detected speed with the reference speed, and performing an eccentricity detection section or a capacity detection section according to the comparison result, according to the response speed to a predetermined duty before the main dehydration section. The dehydration stroke is simplified by performing the eccentricity detection section or the execution of the quantity detection section.

The control method according to claim 2 of the filed claim maintains the control step and the sensing step for a predetermined time, so that the motor rotates in response to the applied duty sufficiently.

Comparing step according to claim 3 in the filed application, when the detected speed is more than the reference speed, it is determined that the load in the drum is a single or very small load, to determine the characteristics of the load before the eccentric detection section, simplifying the dewatering stroke And it will shorten the entry time to the main dewatering.

The control method according to claim 4 of the filed claim, when the load in the drum is a single or very small load, by performing the eccentric detection section, so as not to perform the dose detection section shortens the entry time to the main dehydration section.

The control method of the drum washing machine according to the present invention according to claim 5 of the present invention detects whether the load in the drum is a single load or a very small load, and performs a quantity detection section or an eccentric detection section according to the detection result. It includes a step.

The control method according to claim 6 of the filing claims, when the load is a single or very small load, performs the eccentric detection interval.

The sensing step according to claim 7 in the application detects the load according to the speed of the motor for a certain duty, so as to sense the load by simple motor control.

The present invention of such a configuration has an effect of reducing the entry time of the main dehydration section by first determining whether a single load or a very small load.

In addition, the present invention has the effect of reducing the power consumption by detecting a single or very small load at the beginning of the dehydration stroke, simplifying the dewatering stroke.

In addition, the present invention has the effect that the eccentric detection section is performed according to the determination of a single or very small load, so that more accurate eccentric detection is performed.

Claims (7)

In the control method of the drum washing machine performed before the main dehydration section, the control method is: Controlling the motor by a certain duty; Sensing the speed of the motor relative to the duty; Comparing the sensed speed with the reference speed; The control method of the drum washing machine comprising the step of performing an eccentricity detection section or a quantity detection section according to the comparison result. The method of claim 1, The control method is a control method of a drum washing machine, characterized by maintaining the control step and the sensing step for a predetermined time. The method of claim 1, The comparing step determines that the load in the drum is a single or very small load when the detected speed is above the reference speed. The method of claim 3, If the load in the drum is a single or very small load, the control method of the drum washing machine, characterized in that for performing an eccentric detection section. Detecting whether the load in the drum is a single or very small load; The control method of the drum washing machine comprising the step of performing a dose detection section or an eccentric detection section according to the detection result. The method of claim 5, If the load is a single or very small load, the control method is a control method of a drum washing machine, characterized in that to perform an eccentric detection section. The method of claim 5, The sensing step is a control method of a drum washing machine, characterized in that for detecting the load in accordance with the speed of the motor for a certain duty.

Images