KR20090130669A - Method of controlling washing machine - Google Patents

Abstract

PURPOSE: A controlling method of a washing machine is provided to determine an amount of detergent according to turbidity of cleaning water, thereby notifying a user of additional injection of the detergent. CONSTITUTION: Turbidity of cleaning water is sensed(103). A level of an amount of injected detergent is determined by using the turbidity(104). Cleaning time is controlled based on the level of the injected detergent(106). When preset detergent dissolving time comes, the turbidity is sensed. When the turbidity is sensed, the turbidity periodically sensed for the preset detergent dissolving time is average. When the level of the detergent is determined, reference turbidity is compared with the sensed turbidity.

Description

Method of controlling washing machine

The present invention relates to a control method of a washing machine, and more particularly, to a control method of a washing machine to adjust the washing time according to the turbidity of the wash water.

The washing machine is a device for washing a laundry cloth through a process such as washing, rinsing, and dehydrating according to a preset algorithm. The washing machine includes a tub containing a fully automatic washing machine or washing water using horizontal rotation of a rotary blade, a washing tank, and a dehydrating tank, and a tub. Rotating to the drum, including a drum in which the laundry cloth is inserted can be divided into a drum washing machine so that washing is made by the force of dropping the laundry cloth inside the upper and then dropping when the cylindrical drum rotates.

Such a washing machine has various washing courses and functions in order to respond to various needs of a user, and when a user selects a specific washing course and functions after inputting an arbitrary amount of detergent into a detergent container, watering and washing according to the selected course and functions Wash the laundering cloths while performing rinsing, draining and dehydration strokes.

In addition, when a user selects a specific washing course and a function after inputting a certain amount of detergent, the washing machine judges the weight of the washing cloth and automatically based on the correlation of the determined washing cloth weight and the selected washing course and function. After adjusting the water supply, washing, rinsing, draining and dewatering strokes, perform detergent supply, water supply, washing, rinsing, draining and dewatering strokes as adjusted.

However, such a conventional washing machine has a problem that the washing time is unnecessarily long because the washing machine performs a washing stroke with a predetermined washing time even when a large amount of detergent is input by the user, despite the high washing power due to many detergents.

In addition, the conventional washing machine is very difficult to put the appropriate amount of detergent for washing the laundry bag sufficiently, because the laundry machine is put any amount of detergent, the laundry power is low when a small amount of detergent is not supplied by the user Deterioration may cause a problem of poor washing efficiency.

Therefore, the present invention is derived to solve the above problems, an object of the present invention is to provide a control method of a washing machine to control the washing time by determining the level of detergent according to the turbidity of the wash water.

Another object of the present invention to provide a control method of the washing machine to determine the level of detergent amount according to the turbidity of the wash water to inform the user whether or not to add the detergent.

The present invention for achieving the above object is a step of detecting the turbidity of the wash water; Determining the level of the detergent amount added using turbidity; Adjusting the washing time based on the level of detergent dispensed.

In addition, the step of detecting turbidity detects turbidity when a predetermined detergent dissolution time is reached.

The step of detecting turbidity also averages periodically detected turbidity for a predetermined detergent dissolution time.

Determining the level of the detergent amount, it is determined by comparing the detected turbidity and the reference turbidity by the reference detergent amount according to the weight of the laundry cloth put into the washing machine.

The adjusting of the washing time shortens the preset washing time when the level of the detergent amount charged is higher than the level of the standard detergent amount.

Reducing the washing time may include calculating an increase in turbidity of the wash water when a predetermined time elapses during the washing stroke; Maintaining the washing time as a shortened washing time if the increase in turbidity is lower than the reference range; Restoring the washing time to a preset washing time if the increase in turbidity is not lower than the reference range.

If the washing stroke is a hot water washing stroke, the preset time is the time at which heating is completed.

If the washing stroke is a cold water washing administration, the preset time is the time when 30-40% of the washing administration time has elapsed.

The present invention for achieving the above object is a step of detecting the turbidity of the wash water; Determining the level of the detergent amount added using turbidity; Determining the necessity for further dosing of the detergent based on the level of detergent introduced.

Determining the level of the detergent amount, it is determined by comparing the detected turbidity and the reference turbidity by the reference detergent amount according to the weight of the laundry cloth put into the washing machine.

In addition, in the step of determining the need for additional detergent, it is determined that additional detergent is required when the amount of detergent added is lower than that of the standard detergent.

In addition, if it is determined that the additional input of the detergent, further comprising the step of indicating to the user the need for additional input of the detergent.

As described above, according to the present invention, when the amount of detergent added, the washing power becomes higher than the average washing power. Accordingly, it is possible to maintain a certain level of washing power by adjusting the washing time by determining the level of the detergent amount, and also to reduce the washing time, thereby reducing the power consumed for washing.

In addition, since the level of detergent is determined according to the turbidity of the wash water, the user is notified of whether the detergent is added. Therefore, the laundry cloth can be washed with an appropriate detergent amount, thereby improving washing efficiency.

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

1 is an exemplary view showing a drum washing machine according to an embodiment of the present invention, the drum washing machine main body 11, the door 12, the tub 13, the drum 14, the motor 15, the water supply pipe 16 ), A detergent container 17 and a pump 18.

The main body 11 forms an appearance of a drum washing machine, and an inlet for inserting and extracting a laundry cloth is formed, and a door 12 for opening and closing the inlet is mounted at a portion where the inlet of the main body 11 is formed. The inner peripheral surface of the diaphragm for sealing between the door 12 and the inlet is mounted.

The tub 13 is fixedly installed in the main body 11 and accommodates the wash water supplied from the water supply pipe 16. A drum 14 having a shape corresponding to the tub shape is installed inside the tub 13, and a motor 15 for rotating the drum 14 clockwise or counterclockwise is installed outside.

The tub 13 is provided with a turbidity detector 20 for detecting turbidity of the wash water, and the turbidity detector 20 is provided at a different position and detects turbidity of the wash water at each position. The tub 13 is provided with a heating unit 30 for heating the washing water, and a temperature sensing unit 40 for sensing the temperature of the washing water heated by the heating unit 30 is further provided.

The drum 14 is rotatably installed in the tub 13 and mounted so that the side opened toward the inlet of the main body 11 is located to accommodate the laundry cloth, and a plurality of holes are formed in the circumferential surface of the drum 14. And the wash water flows into the tub 13 through the hole, the rotating shaft is provided on the outside of the rear of the drum 14, the rotating shaft is extended to the outside of the tub 13 to be connected to the motor (15).

The water supply pipe 16 is connected to an external water pipe (not shown), etc., and introduces washing water into the tub 13 and the drum 14 during the washing stroke.

The detergent container 17 stores the detergent injected by the user, and the detergent container 17 is connected to the water supply pipe 16 so that the wash water flowing into the water supply pipe 16 when the washing water is supplied into the tub 14 during the washing stroke. Then, the introduced wash water flows to the tub 13 together with the detergent.

The pump 18 pumps the washing water used in the washing stroke through the flow pipe provided under the tub 13, and discharges the washing water to the outside of the main body 11 during the drainage stroke after the washing stroke is completed.

2 is a control block diagram of the drum washing machine according to an embodiment of the present invention, the turbidity detection unit 20, the heating unit 30, the temperature detection unit 40, the motor drive unit 50, the weight detection unit 60 , A control unit 70, a display unit 80, and a memory unit 90.

Turbidity detection unit 20 is provided in the tub 13, but has at least one turbidity sensor provided in an optimal position for detecting the turbidity of the wash water and at least one turbidity sensor is turbidity of the wash water accommodated in the tub 13 After detecting the detection result is transmitted to the control unit 70.

By using the turbidity detection unit 20 to detect the turbidity of the wash water according to the time of each stroke, it is possible to know the performance of each stroke according to the detection result. That is, FIG. 3 is a graph of turbidity change of wash water according to time of each stroke detected by three turbidity sensors positioned at three positions without detergent, and is shown in the turbidity change detected by a plurality of turbidity sensors. Thus, the degree of performance of each administration can be known.

The heating unit 30 is provided in the tub 13 and heats the washing water in the tub 13 to a preset temperature in order to increase the washing power of the washing cloth during the washing stroke, and turns on when the temperature of the washing water reaches a preset temperature. The off operation allows the wash water to remain at the set temperature. The heating unit 30 increases the washing efficiency by heating the washing water so that the washing cloth is washed by heated washing water, that is, hot water.

The preset temperature here is the temperature of the wash water corresponding to the washing course or function selected by the user.

The temperature detector 40 is provided in the tub 13, and after sensing the temperature of the heated wash water, transmits the detection result to the controller 70.

The motor drive unit 50 drives the motor 15 connected to the drum 14 to provide an exercise force for washing the laundry cloth during the washing stroke.

When the laundry cloth is accommodated in the drum 14, the weight detector 60 detects the weight of the laundry cloth accommodated therein and transmits the detection result to the controller 70.

As the weight sensing method of the laundry cloth of the weight sensing unit 60, any one of the commonly used technologies is used, for example, by using a load cell that directly detects the weight of the laundry cloth, The method of estimating the weight of a washing cloth from the torque of the motor by rotation, or the weight of the washing cloth from the washing cloth wet after primary water supply is mentioned, for example.

The control unit 70 controls the operation of the weight detection unit 60 to detect the weight of the laundry cloth accommodated in the drum, and transmits the transmitted weight to the memory unit 90 when the detected weight is transmitted from the weight detection unit 60. When the washing course and the function is selected by the user from the input unit (not shown), the washing time is set to be transmitted and stored, and the washing time corresponding to the selected washing course and function or the weight of the washing cloth is set and transmitted to the memory unit 90, and the washing cloth On the basis of the weight of the laundry cloth to determine the amount of wash water to be washed to control the water supply.

The controller 70 determines whether or not the washing water is heated according to the washing course and function selected by the user or the instruction of the user when the washing stroke is started, and when the washing stroke is started when the washing water is heated to perform the washing stroke. From the predetermined heating time to control the operation of the heating unit 30 so that the wash water is heated.

The controller 70 controls the operation of the temperature sensor 40 while the washing water is heated to receive the temperature of the washing water, and compares the temperature of the washing water with the preset temperature to detect the washing water temperature in advance. When the temperature is set, the operation of the heating unit 30 is controlled on and off so that the temperature of the washing water is maintained at a preset temperature.

The controller 70 controls the operation of the heating unit 30 to stop when the preset heating time elapses.

The controller 70 controls the driving of the motor driving unit 50 by a preset algorithm according to the washing course and function selected by the user when the washing stroke is started, and the drum 14 is rotated according to the rotation of the motor 15. do.

The controller 70 controls the turbidity detection unit 20 to detect the first turbidity of the wash water after the detergent dissolution time, that is, the first predetermined time elapses from the start of the washing process, and detects the turbidity detection unit 20. Once the primary turbidity is transferred, the level of input detergent is determined based on the primary turbidity transmitted.

If a plurality of turbidity sensors are provided in the turbidity detection unit 20, the control unit 70 uses the turbidity of any one of the turbidity sensors transmitted from the turbidity detection unit 20, or uses the average turbidity value of the plurality of sensors. Determine the level of detergent input.

The controller 70 detects the turbidity of the wash water every time the motor 15 is stopped for a predetermined time from the first predetermined time when the detergent dissolution time, that is, the first predetermined time elapses, from the time when the washing stroke starts. More accurate turbidity can be obtained by calculating the average turbidity of the plurality of turbidities.

The control unit 70 compares the standard turbidity and the primary turbidity based on the weight of the laundry cloth to determine the level of the input detergent amount, and adjusts the washing time set in advance according to the level of the detergent amount.

 In more detail, when the primary turbidity exceeds a certain range of the standard turbidity, it is determined that more detergent amount is added than the level of the standard detergent amount (that is, the level of the added detergent amount is high) and the washing is performed at a predetermined short time.

On the other hand, if the primary turbidity is within a certain range of the standard turbidity by comparing the standard turbidity and the primary turbidity, it is determined that the level of the detergent amount added is equivalent to the amount of the standard detergent amount (that is, the level of the detergent amount added) is set in advance. Wash at the washing time.

In addition, when the primary turbidity is less than a certain range of the reference turbidity, it is determined that the amount of detergent less than the level of the standard detergent amount is input (that is, the level of the added detergent amount is low) and the washing time is set to a preset washing time.

The level of the standard detergent amount is the level when the appropriate amount of detergent is added based on the weight of the laundry cloth, wherein the primary turbidity of the wash water is within a certain range of the standard turbidity.

The controller 70 detects the second turbidity of the wash water after a second predetermined time from the time when the washing stroke starts, and detects the third turbidity of the wash water when the third predetermined time elapses from the second predetermined time. Compare tea turbidity with tertiary turbidity.

More specifically, the second predetermined time is a time at which the heating operation of the heating unit 30 is stopped when washing with warm water. If the degree of contamination of the laundry cloth is weak, washing of the laundry cloth while the heating unit 30 is operating is performed. There is almost no change in turbidity, and if the degree of contamination of the laundry cloth is strong, the pollutant is removed and the turbidity changes even after the operation of the heating unit 30 is stopped. The degree of washing of the laundry cloth is determined by comparing the tea turbidity with the tertiary turbidity of the third constant time after the third constant time has elapsed.

In addition, when washing with cold water, the second predetermined time is a time when 30-40% of the total washing stroke time has elapsed since the washing stroke starts.

The controller 70 determines whether to maintain a shorter washing time according to an increase in turbidity compared to secondary turbidity and tertiary turbidity.

That is, the control unit 70 maintains the washing time at a shortened time if the increase in turbidity is lower than the reference range, and restores the washing time to a preset washing time if it is not lower than the reference range.

Here, as a result of comparing the secondary turbidity and the tertiary turbidity, if the increase in turbidity is lower than the reference range, contaminants are removed from the laundry cloth and no further washing is required. Accordingly, even if the washing time is shortened, since the washing power is the same as when washing with the set washing time, washing is performed by maintaining the shortened washing time.

In addition, as a result of the comparison between the second turbidity and the third turbidity, if the increase in turbidity is not lower than the reference range, it is determined that there is a contaminant to be further removed from the laundry cloth. The shortened washing time is restored to a preset washing time so that sufficient washing is performed.

The controller 70 compares the standard turbidity and the primary turbidity based on the weight of the laundry cloth to determine the level of detergent, and determines whether to add detergent according to the determined amount of detergent.

The controller 70 may be displayed through the display unit 80 so that the user can easily identify the addition of the detergent or the appropriate amount of detergent.

In more detail, the control unit 70 determines the level of the input detergent amount from the standard turbidity and the primary turbidity, and if the primary turbidity is less than a predetermined range of the standard turbidity, the input detergent amount is determined to be lower than the standard detergent amount and the washing power is lowered. In order to prevent the user from being added to the detergent to be displayed on the display unit 80 so that the user can easily identify.

The display unit 80 shortens the washing time or restores the washing time to a predetermined washing time, and displays whether additional detergent is added.

The memory unit 90 stores a washing time based on a washing course, a function, or a cloth weight selected by the user, and stores the first turbidity, the second turbidity, and the third turbidity of the wash water transmitted from the control unit 70. After detecting the first turbidity of the wash water, the average value of the plurality of turbidities and the plurality of turbidities detected each time the motor is stopped is stored.

The memory unit 90 stores a water supply amount corresponding to the weight of the laundry cloth, a reference detergent amount based on the weight of the laundry cloth, a reference turbidity based on the reference detergent amount, and a shortening time based on the level of the detergent amount. Is stored.

4 is a flowchart illustrating a control operation of a washing machine according to an embodiment of the present invention with reference to FIGS. 1 and 2.

When washing the laundry cloth, the laundry cloth is put into the drum 14 of the washing machine by the user, and the detergent is put into the detergent container.

When the user selects the washing course or function to operate the washing machine, the washing time is set and stored based on the washing course or function, and the drum 14 is stirred and rotated according to the driving of the motor 15 to wash the drum 14. After detecting the weight of the gun 101, water supply is started.

In addition, when the weight of the laundry cloth is detected using a load cell, the weight of the laundry cloth is sensed, and the washing water corresponding to the detected weight is supplied into the tub 13, and based on the wet cloth, When the weight is sensed, the first wash water for the wet cloth is supplied, and then the weight is detected based on the wet cloth and supplied with the tub 13 corresponding to the weight of the detected cloth. .

Since the washing water is supplied to the tub 13 through the detergent container 17 connected to the water supply pipe 16 at the time of water supply, any amount of detergent stored by the user is supplied to the tub 13 together with the washing water.

After completion of the water supply, when the first predetermined time, which is the detergent dissolution time, elapses 102, the primary turbidity of the washing water is detected 103, and the level of the input detergent amount is determined 104 according to the detected primary turbidity.

At this time, the turbidity detection detects the turbidity of the wash water using at least one turbidity sensor, and when the turbidity of the wash water is detected using the plurality of turbidity sensors, the turbidity detected by any one turbidity sensor is used.

In addition, for the accuracy of the turbidity of the wash water, when the first predetermined time, the detergent dissolution time elapses, the turbidity is detected every time the motor is stopped from the first predetermined time to a predetermined predetermined time, and the average turbidity of the detected multiple turbidities is measured. It is also possible to determine the level of the input detergent amount according to the calculated average turbidity.

Next, the reference turbidity based on the weight of the laundry cloth is extracted from the memory unit 90, and the extracted standard turbidity is compared with the primary turbidity to determine whether the level of the detergent amount injected is greater than or equal to the level of the standard detergent amount 105.

Here, the level of the standard detergent amount is a level of detergent in which an appropriate amount of detergent is added based on the weight of the laundry cloth to maintain the average washing power, wherein the primary turbidity of the wash water is within a predetermined range of the standard turbidity.

In more detail, when the primary turbidity exceeds a certain range of the standard turbidity, it is determined that more detergent amount is input than the level of the standard detergent amount (that is, the level of the added detergent amount is high) and the washing is performed at a predetermined short time. .

On the other hand, by comparing the standard turbidity and the primary turbidity, if the primary turbidity is within a certain range of the standard turbidity, it is determined that the level of the amount of detergent added is equivalent to the amount of the standard detergent (that is, the level of the amount of detergent added) 1 When the tea turbidity is less than a predetermined range of the reference turbidity, it is determined that the amount of detergent less than the level of the standard detergent amount is input (that is, the level of the added detergent amount is low), and the laundry is washed 107 at a preset washing time.

This will be described with reference to FIGS. 5 and 6.

5 is a graph showing the washing power according to the change of detergent amount when washing the laundry cloth of the same weight, the more the detergent amount, the higher the washing force.

6 is a graph of turbidity change of wash water according to the amount of detergent, and the amount of detergent in (a) is twice as much detergent amount as the amount of detergent in (b).

It can be seen that turbidity is higher when the washing stroke is performed with more detergent amount as shown in (a) than when the washing stroke is performed with less detergent amount as shown in FIG. That is, the greater the amount of detergent during the washing stroke, the higher the washing power.

As shown in (a) of FIG. 6, when the turbidity starts to be maintained when the amount of detergent is large, it can be seen that the time when the turbidity starts to be maintained when the detergent amount is small as shown in (b). That is, the more detergent amount, the faster the turbidity is maintained.

In this case, the turbidity is maintained at the point where all the contaminants come out of the cloth and the turbidity reaches the saturation state. It is possible to shorten the washing stroke.

7 is a flowchart illustrating a control operation of a washing machine according to this embodiment of the present invention, with reference to FIG. 4.

When the level of the detergent amount added is determined based on the first turbidity, and the washing time is shortened according to the determination result, the washing 106 determines the washing degree of the laundry cloth to determine whether to maintain the shortened washing time.

More specifically, when the second predetermined time elapses from the time when the washing stroke starts (106-1), the second turbidity of the wash water is detected (106-2), and the third predetermined time elapses from the second predetermined time. In step 106-3, the third turbidity, which is the turbidity of the wash water, is detected (106-4) to determine whether the turbidity is increased, that is, the amount of increase in the second turbidity and the third turbidity.

In this case, when the hot water is used as the washing water, the second predetermined time is a time at which the heating operation of the heating unit 30 is stopped, and when the cold water is used as the washing water, the second predetermined time is the time of the total washing administration from the time when the washing stroke starts. The time at which 30-40% of the time elapses.

In addition, Figure 8 is a change in turbidity of the wash water for each stroke according to whether the washing water is heated, Figure 8 (a) is a turbidity graph of the wash water for each stroke when the washing water heating (that is, hot water), (b ) Is the turbidity graph of the wash water for each stroke when the wash water is not heated (ie cold water).

When the washing stroke is performed with the heated wash water (that is, hot water) as shown in FIG. 8A, the washing stroke is performed when the washing stroke is performed with the unheated wash water (ie, cold water) as shown in (b). It can be seen that the turbidity is high. Therefore, when the washing process is performed by heating the wash water, it can be seen that the washing power of the washing cloth is increased.

Next, it is determined whether the increase amount of turbidity is lower than the reference range (106-5) to determine whether to maintain the shortened washing time.

That is, if the increase in turbidity is lower than the reference range, it is determined that there is no change in turbidity due to all the contaminants coming out of the laundry cloth.

Here, there is no change in turbidity, and sufficient washing has been performed. Even when the washing time is shortened, washing power is the same as when washing with a preset washing time.

On the other hand, if the amount of increase in turbidity is not lower than the reference range, there is more contaminant to be taken out of the laundry cloth, so that the turbidity has changed, so that the laundry is restored to a preset washing time (106-7).

Accordingly, sufficient washing may be achieved by restoring the shortened time again and washing with a preset washing time.

As the washing time is shortened, the reduction of power consumption is very effective.

In addition to the method of determining the degree of washing by detecting at least two turbidity as described above, by detecting the turbidity periodically until the third predetermined time after the second predetermined time elapses to determine the increase in the detected turbidity periodically It is also possible to determine the saturation of the contamination of the fabric.

9 is a flowchart illustrating a control operation of a washing machine according to an embodiment of the present invention with reference to FIGS. 1 and 2.

When washing the laundry cloth, the laundry cloth is put into the drum 14 by the user, and detergent is put into the detergent container.

When the user selects the washing course or function to operate the washing machine, the washing time is set based on the selected washing course or function, and the drum 14 is stirred and rotated according to the driving of the motor 15 to wash the drum 14. After detecting the weight of the fabric (201), water supply starts.

Since the washing water is supplied to the tub 13 through the detergent container 17 connected to the water supply pipe 16 at the time of water supply, any amount of detergent stored by the user is supplied to the tub 13 together with the washing water.

After the completion of the water supply, when the first predetermined time that is the detergent dissolution time elapses 202, the primary turbidity of the washing water is detected 203, and the level of the input detergent amount is determined 204 according to the detected primary turbidity.

Next, the standard turbidity based on the weight of the laundry cloth is extracted from the memory unit 90, and the extracted standard turbidity is compared with the primary turbidity to determine whether an appropriate amount of detergent is added.

That is, when the primary turbidity is lower than the reference turbidity, it is determined that the level of the added detergent amount is lower than the level of the standard detergent amount (205), so that the user can easily identify that the detergent should be added to prevent the lowering of the washing power. Indicated by (80) (206).

At this time, when the user needs to add the detergent, the user adds the detergent through the confirmation of the display unit 80.

On the other hand, if the primary turbidity is higher than the reference turbidity, it is determined that the level of the detergent amount injected is higher than the level of the standard detergent amount, and displayed on the display unit 80 so that the user can easily identify that an appropriate amount of detergent for effective washing has been input. do.

In addition, even when the primary turbidity is the same as the reference turbidity, it is determined that the level of the detergent amount added is appropriate and is displayed on the display unit 80 so that the user can easily identify that the appropriate amount of detergent for the effective washing.

In addition, if the detergent is additionally supplied by the user after the addition of the detergent amount, the detergent dissolution time elapses from the time when the detergent is additionally supplied, the turbidity of the wash water is sensed to determine the level of the input detergent amount, and to determine the level of the input detergent amount. Accordingly, it is possible to determine whether the washing time is shortened by the same method as in the exemplary embodiment.

1 is an exemplary view of a drum washing machine according to an embodiment of the present invention.

2 is a control block diagram of a drum washing machine according to an embodiment of the present invention.

Figure 3 is a turbidity graph of the wash water for each stroke according to an embodiment of the present invention.

4 is a control flowchart of a washing machine according to an embodiment of the present invention.

5 is a turbidity graph of the detergent amount and washing power according to an embodiment of the present invention.

6 is a turbidity graph of the detergent amount and washing water for each stroke according to an embodiment of the present invention.

7 is a control flowchart of a washing machine according to this embodiment of the present invention.

8 is a turbidity graph of washing water and washing water for each stroke according to an embodiment of the present invention.

9 is a control flowchart of a washing machine according to an embodiment of the present invention.

* Description of symbols on the main parts of the drawings *

11: body 13: tub

14: drum 20: turbidity detection unit

30: heating part 40: temperature sensing part

50: motor drive unit 60: weight detection unit

70: control unit 80: display unit

90: memory section

Claims (12)

Detecting turbidity of the wash water; Determining the level of the detergent amount added by using the turbidity; Control method of the washing machine comprising the step of adjusting the washing time based on the level of the detergent amount. The method of claim 1, Detecting the turbidity is a control method of the washing machine for detecting the turbidity when a predetermined detergent dissolution time. The method of claim 1, The detecting of the turbidity may include averaging the detected turbidity periodically for a predetermined detergent dissolution time. The method of claim 1, Determining the level of detergent amount, The control method of the washing machine to determine by comparing the standard turbidity and the detected turbidity by the reference detergent amount according to the weight of the laundry cloth put into the washing machine. The method of claim 1, Adjusting the washing time, The control method of the washing machine to shorten the predetermined washing time when the level of the detergent amount injected is higher than the level of the standard detergent amount. The method of claim 5, wherein Shortening the washing time, Calculating an increase amount of turbidity of the wash water when a predetermined time elapses during the washing stroke; Maintaining the washing time as a shortened washing time when the increase in turbidity is lower than a reference range; And restoring the washing time to a preset washing time when the increase in turbidity is not lower than a reference range. The method of claim 6, And when the washing stroke is a hot water washing stroke, the preset time is a time when the heating is completed. The method of claim 6, If the washing stroke is a cold water washing stroke, the preset time is a time when 30 to 40% of the washing stroke time has elapsed. Detecting turbidity of the wash water; Determining the level of the detergent amount added by using the turbidity; The control method of the washing machine comprising the step of determining the need for the addition of detergent based on the level of the detergent amount injected. The method of claim 9, Determining the level of detergent amount, The control method of the washing machine to determine by comparing the standard turbidity and the detected turbidity by the reference detergent amount according to the weight of the laundry cloth put into the washing machine. The method of claim 9, Determining the necessity of further input of the detergent If the level of the detergent amount is lower than the level of the standard detergent amount control method of the washing machine determines that additional detergent is required. The method of claim 11, If it is determined that the addition of the detergent is necessary, the control method of the washing machine further comprising the step of indicating to the user the need for the addition of the detergent.

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