KR100412047B1 - Washing water refilling control method of drum washing machine - Google Patents
Washing water refilling control method of drum washing machine Download PDFInfo
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- KR100412047B1 KR100412047B1 KR10-1998-0059794A KR19980059794A KR100412047B1 KR 100412047 B1 KR100412047 B1 KR 100412047B1 KR 19980059794 A KR19980059794 A KR 19980059794A KR 100412047 B1 KR100412047 B1 KR 100412047B1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/087—Water level measuring or regulating devices
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
- D06F33/34—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of water filling
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/06—Timing arrangements
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/18—Washing liquid level
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/38—Time, e.g. duration
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/02—Water supply
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
Abstract
본 발명의 목적은 드럼세탁기의 저수조에 투입되는 세탁수가 부족하여 원활한 세탁이 이루어지지 못하게 되는 경우에 부족분의 세탁수량을 낭비없이 정확하게 보충 급수할 수 있게 되는 드럼세탁기의 세탁수 보충 제어방법을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a washing water replenishment control method of a drum washing machine, which is capable of accurately replenishing and supplying a shortage of washing water without wasting when washing water introduced into a reservoir of the drum washing machine is insufficient. have.
상기 목적을 달성하기 위한 본 발명은 세탁운전중 세탁수 보충여부를 판단하는 단계와, 세탁수 보충시점이면 급수밸브의 온과 동시에 제1설정시간을 타이밍하는 단계와, 제1설정시간의 타이밍이 완료되면 급수밸브의 오프와 동시에 드럼모터를 정지하고 제2설정시간을 타이밍하는 단계와, 상기 제2설정시간 종료전 수위감지를 수행하여 설정수위에 도달하였으면 세탁운전을 재개하고 설정수위에 도달하지 않았으면 급수밸브를 다시 온하여 재급수하는 단계를 포함한다.The present invention for achieving the above object is the step of determining whether the washing water replenishment during the washing operation, the timing of the first set time and the timing of the first set time at the same time when the water supply valve is turned on When the water supply valve is completed, the drum motor is stopped and timing the second set time and the water level detection before the end of the second set time are performed. If the set water level is reached, the washing operation is resumed and the set water level is not reached. If not, the step of turning on the water supply valve again to supply water.
이와 같은 본 발명은 드럼세탁기의 세탁운전중 세탁수 부족으로 인한 보충수 공급사인이 발생되면 일정시간 급수후 드럼모터 정지상태에서 수위를 체크하여 세탁수의 적정여부를 판단하게 되므로 드럼세탁기의 세탁수를 항상 최적상태로 유지시킬 수 있어 세탁수의 과소비 또는 세탁불량을 방지하게 된다.In the present invention as described above, if a supplementary water supply sign occurs due to lack of washing water during the washing operation of the drum washing machine, the washing water of the drum washing machine is determined by checking the water level in the stopped state of the drum motor after water supply for a predetermined time. It can be kept in an optimal state at all times to prevent excessive consumption or poor washing of the wash water.
Description
본 발명은 드럼세탁기에 관한 것으로, 특히 세탁도중 저수조의 세탁수위가 낮아져 원활한 세탁이 이루어지지 못함으로서 발생되는 저수위 감지신호에 따라 세탁수를 보충하게 되는 경우 부족분의 세탁수량만 정확하게 보충해 줌으로써 과도한 세탁수의 낭비를 피하면서 최적의 세탁 운전조건을 만들어줄 수 있게 되는 드럼세탁기의 세탁수 보충 제어방법에 관한 것이다.The present invention relates to a drum washing machine, and in particular, when the washing water level of the water tank is lowered during washing, the washing is replenished according to the low water level detection signal generated by the low water level detection signal. The present invention relates to a washing machine replenishment control method of a drum washing machine which can make an optimal washing operation condition while avoiding waste of water.
일반적으로 수직축 상에서 세탁조를 회전시키는 저수조형 세탁기가 펄세이터의 회전구동을 통하여 저수조 내의 세탁수에 잠겨진 세탁물을 교반 세탁하는 것과는 달리 드럼형 세탁기는 세탁물이 투입된 드럼을 수평회전시키는 동작으로 세탁운전을 실행하게 된다.In general, unlike the water-type washing machine that rotates the washing tank on the vertical axis to stir the laundry immersed in the washing water in the water tank by rotating the pulsator, the drum-type washing machine executes the washing operation by rotating the drum in which the laundry is put horizontally. Done.
따라서 드럼형 세탁기는 일반 저수조형 세탁기와는 다른 기계적인 구조를 가지게 된다.Therefore, the drum type washing machine has a mechanical structure different from that of the general water type washing machine.
도 1은 종래의 드럼세탁기의 개략적인 단면도로서, 세탁물(22)을 장입하고 있는 드럼(21) 둘레의 저수조(20)에는 일정수준까지의 수위(23)로 급수되어진 상태를 보이고 있다. 여기에서는, 드럼(21)이 회전하면 세탁수에 잠겨있던 세탁물(22)이 리프터(24)에 걸려 윗쪽으로 이동한 후 일정위치에 이르게 되면 자중에 의해 낙차되게 되며 이때의 낙차력으로 세탁이 이루어지도록 하고 있다.1 is a schematic cross-sectional view of a conventional drum washing machine, and shows a state in which the water tank 23 around the drum 21 in which the laundry 22 is charged is supplied with water level 23 up to a predetermined level. In this case, when the drum 21 rotates, the laundry 22, which has been locked in the wash water, is caught by the lifter 24 and moved upward, and when the drum 21 reaches a certain position, the laundry 22 drops by its own weight. To lose.
이러한 세탁운전중 세탁수량 부족상태가 되면 마이컴은 급수밸브를 제어하여 추가급수를 수행함으로써 세탁수의 부족분을 보충하게 되는데, 이때 드럼은 계속 운전중인 상태이므로 실제수위와 측정되는 수위에는 많은 오차가 존재한다.When the washing water is insufficient during such a washing operation, the microcomputer compensates for the shortage of the washing water by performing additional water supply by controlling the water supply valve. At this time, since the drum is still in operation, there are many errors in the actual water level and the measured water level. do.
드럼세탁운전중 저수조의 수위는 세탁드럼이 회전하면서 세탁물이 연속적으로 세탁수를 끌고 이동하게 되기 때문에 실제수위값 보다는 측정수위값이 적게 나타나게 된다During the drum washing operation, the water level in the reservoir will be lower than the actual water level because the laundry will rotate and the laundry will continue to move as the washing drum rotates.
따라서 종래의 세탁수 부족에 따른 보충급수시 실제로 필요한 급수량보다 많게 급수되어 세탁수의 낭비를 초래해 오고 있었다.Therefore, when supplementary water supply due to the conventional lack of wash water is supplied more than the actual amount of water required has been a waste of wash water.
본 발명의 목적은 드럼세탁기의 저수조에 투입되는 세탁수가 부족하여 원활한 세탁이 이루어지지 못하게 되는 경우에 현재의 저수조의 실제수위를 오차없이 측정하여 정상치에 대해 부족한 분량의 세탁수량만을 정확하게 보충 급수할 수 있도록 함으로써 세탁수의 과소비를 방지할 수 있도록 한 드럼세탁기의 세탁수 보충 제어방법을 제공하는데 있다.An object of the present invention is to measure the actual water level of the current reservoir without error when the washing water to be put into the reservoir of the drum washing machine is insufficient, can be replenished water supply accurately only the insufficient amount of washing water to the normal value It is to provide a washing water replenishment control method of the drum washing machine to prevent excessive consumption of the washing water.
도 1은 드럼세탁기의 저수상태를 설명하기 위한 개략적인 단면도이다.1 is a schematic cross-sectional view for explaining the storage state of the drum washing machine.
도 2는 본 발명에 적용되는 드럼세탁기의 제어회로 구성도이다.2 is a block diagram illustrating a control circuit of a drum washing machine according to the present invention.
도 3은 본 발명의 제어과정을 설명하기 위한 흐름도이다.3 is a flowchart illustrating a control process of the present invention.
※도면의 주요부분에 대한 부호의 설명※※ Explanation of symbols about main part of drawing ※
10 : 마이컴 11 : 로드셀10: microcomputer 11: load cell
12 : 급수제어부 13 : 급수밸브12: water supply control unit 13: water supply valve
14 : 배수제어부 15 : 배수모터14: drain control unit 15: drain motor
16 : 배수밸브 17 : 모터구동 제어부16: drain valve 17: motor drive control unit
18 : 모터 19 : 수위센서18: motor 19: water level sensor
20 : 저수조 21 : 드럼20: reservoir 21: drum
22 : 세탁물 23 : 수위22: laundry 23: water level
상기 목적을 달성하기 위한 본 발명은 세탁운전중 세탁수 보충여부를 판단하는 단계와, 세탁수 보충시점이면 급수밸브의 온과 동시에 제1설정시간을 타이밍하는 단계와, 제1설정시간의 타이밍이 완료되면 급수밸브의 오프와 동시에 드럼모터를 정지하고 제2설정시간을 타이밍하는 단계와, 상기 제2설정시간 종료전 수위감지를 수행하여 설정수위에 도달하였으면 세탁운전을 재개하고 설정수위에 도달하지 않았으면 급수밸브를 다시 온하여 재급수하는 단계를 포함하는 것을 특징으로 한다.The present invention for achieving the above object is the step of determining whether the washing water replenishment during the washing operation, the timing of the first set time and the timing of the first set time at the same time when the water supply valve is turned on When the water supply valve is completed, the drum motor is stopped and timing the second set time and the water level detection before the end of the second set time are performed. If the set water level is reached, the washing operation is resumed and the set water level is not reached. If not, characterized in that it comprises the step of re-supplied by turning on the water supply valve again.
첨부한 도면을 참고로 하여 본 발명을 구체적으로 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명의 실행을 위한 드럼세탁기의 제어회로 구성도이다.2 is a block diagram of the control circuit of the drum washing machine for carrying out the present invention.
여기에서 참고되는 바와 같이, 드럼세탁기의 전체 동작을 제어하게 되는 마이컴(10)에는 로드셀(11)에서 검출되는 세탁물의 중량값 변환 전기신호와, 저수탱크(20)내의 수위센서(19)에 의한 수위감지 신호가 입력되게 연결한다.As referred to herein, the microcomputer 10 that controls the overall operation of the drum washing machine includes a weight value electrical signal converted by the laundry detected by the load cell 11 and a water level sensor 19 in the water storage tank 20. Connect the water level detection signal.
상기 마이컴(10)에서 처리되어 출력되는 급수제어 신호는 급수제어부(12)로 출력되게 연결하고, 상기 급수제어부(12)의 출력에 의해서는 급수밸브(13)가 작동되게 연결한다.The water supply control signal processed and output from the microcomputer 10 is connected to the water supply controller 12, and the water supply valve 13 is operatively connected by the output of the water supply controller 12.
상기 마이컴(10)에서 처리되어 출력되는 배수제어 신호는 배수제어부(14)로 출력되게 연결하고, 상기 배수제어부(14)의 출력에 의해서는 배수밸브(15)와 배수모터(16)가 작동되게 연결한다.The drain control signal processed and output from the microcomputer 10 is connected to the drain control unit 14, and the drain valve 15 and the drain motor 16 are operated by the output of the drain control unit 14. Connect.
상기 마이컴(10)에서 처리되어 출력되는 드럼 구동용 모터의 제어신호는 모터구동 제어부(17)로 출력되게 연결하고, 상기 모터구동 제어부(17)의 출력에 의해서는 드럼 모터(18)가 구동하게 연결한다.The control signal of the drum driving motor processed and output from the microcomputer 10 is connected to the motor driving control unit 17, and the drum motor 18 is driven by the output of the motor driving control unit 17. Connect.
이와 같이 구성된 드럼세탁기 제어회로에 기초하여 본 발명의 실행과정을 설명하면 다음과 같다.The implementation process of the present invention based on the drum washing machine control circuit configured as described above is as follows.
먼저, 드럼세탁기의 도어를 열고 세탁물을 투입한 후 세탁운전 스타트 스위치를 온 시키면 드럼내에 투입된 세탁물의 중량은 로드셀(11)에 의해 검출된다. 이렇게 로드셀(11)에 의해 검출된 세탁물의 중량은 마이컴(10)에 입력된다.First, when the door of the drum washing machine is opened and the laundry is put in and the washing operation start switch is turned on, the weight of the laundry put into the drum is detected by the load cell 11. The weight of the laundry detected by the load cell 11 is input to the microcomputer 10.
이에 따라 마이컴(10)은 메모리 테이블을 참조하여 급수량을 결정하고 급수제어부(12)에 제어명령을 출력하여 급수밸브(13)가 열려지도록 함으로써 급수가 시작된다. 이렇게 급수가 진행되면 저수조의 일측에 마련된 수위센서(19)가 연속적으로 수위를 모니터링하여 그 검출 수위값을 마이컴(10)에 제공한다.Accordingly, the microcomputer 10 determines the water supply amount by referring to the memory table and outputs a control command to the water supply control unit 12 so that the water supply valve 13 is opened to start the water supply. As the water supply proceeds, the water level sensor 19 provided on one side of the water tank continuously monitors the water level and provides the detected water level value to the microcomputer 10.
상기 마이컴(10)은 입력되는 수위센서(19)로부터의 급수수위 검출신호를 받아들여 설정된 수위값에 도달하였는지 여부를 판단하여 급수수위값이 설정수위값에 도달하였으면 급수밸브 제어부(12)를 통해 급수밸브(13)를 차단하여 급수를 중단시킨다.The microcomputer 10 receives the input water level detection signal from the water level sensor 19 and determines whether the set water level value has been reached. The water supply is stopped by shutting off the water supply valve (13).
이렇게 드럼세탁기의 저수조에 세탁물에 대응하는 적정량의 세탁수가 저수 완료되고 나면 마이컴(10)은 내부의 세탁운전 프로그램에 따라 모터구동제어부(17)에 제어신호를 출력하여 모터(18)를 회전구동 시킨다.After the appropriate amount of wash water corresponding to the laundry is completed in the water tank of the drum washing machine, the microcomputer 10 outputs a control signal to the motor drive control unit 17 according to the internal washing operation program to rotate the motor 18. .
모터가 회전 구동하면 저수조(20)내의 세탁드럼(22)도 따라서 회전하게 되며 드럼 내부의 리프터에 의한 세탁물의 순차이동 및 낙차를 이용한 세탁이 실행되게 된다.When the motor is driven to rotate, the washing drum 22 in the water tank 20 also rotates accordingly, and washing by using a sequential movement of the laundry and a free fall by the lifter inside the drum is performed.
드럼 세탁운전중에도 수위센서(19)는 저수조의 수위를 감지하여 마이컴(10)에 제공하게 되며, 현재의 저수수위가 설정수위보다 낮을 경우에는 본 발명에 의한 세탁수 보충을 위한 프로그램을 수행하게 된다.During the drum washing operation, the water level sensor 19 detects the water level of the reservoir and provides it to the microcomputer 10. When the current low water level is lower than the set water level, the water level sensor 19 performs a program for replenishing the wash water according to the present invention. .
그 실행과정을 도 3의 흐름도에 기초하여 설명한다.The execution process will be described based on the flowchart of FIG.
세탁중에는 드럼구동 모터는 온 상태이다. 드럼 구동모터가 회전중인 상태에서 마이컴(10)이 세탁수 보충시점을 판단하면 세탁수 보충을 위해 급수제어부(12)를 통해 급수밸브(13)를 오픈시켜 저수조에 급수를 실행하고 제1설정시간의 도달여부를 판단하기 위해 타이밍을 실행한다.The drum drive motor is on while washing. When the microcomputer 10 determines the washing water replenishment time while the drum driving motor is rotating, the water supply valve 13 is opened through the water supply control unit 12 to replenish the washing water, and the water is supplied to the water storage tank. The timing is executed to determine whether or not.
상기 제1설정시간은 15초정도로 설정할 수 있으나, 필요에 따라 변경시킬 수 있으므로 그 값으로 고정되는 값은 아니다.The first set time may be set to about 15 seconds, but may be changed as necessary, and thus is not a fixed value.
상기 타이밍은 마이컴(10)의 내부에 마련되는 타이머를 이용하게 되며 보충수 급수의 실행과 동시에 시작된 타이밍 값이 마이컴(10)에 사전에 설정 등록시켜놓은 상기의 제1설정시간에 도달하게 되면 급수제어부(12)를 통해 급수밸브(13)를 클로즈 시키는 것으로 급수를 중단한다. 이와 동시에 모터구동 제어부(17)에도 드럼 모터(18)를 정지시키기 위한 제어신호를 출력한다.The timing is to use a timer provided in the microcomputer 10 and the water supply when the timing value started at the same time as the execution of the replenishment water supply reaches the first predetermined time set in advance registered in the microcomputer 10 The water supply is stopped by closing the water supply valve 13 through the control unit 12. At the same time, a control signal for stopping the drum motor 18 is also output to the motor drive control unit 17.
즉, 상기의 제1설정시간은 보충수의 연속 급수시간이 되며 보충급수의 중단과 동시에 드럼 구동용 모터도 그 회전이 정지되게 되는 것이다.That is, the first set time is the continuous water supply time of the replenishment water, and the rotation of the drum driving motor is stopped at the same time as the replenishment water supply is stopped.
이렇게 초회의 보충수 급수작업을 완료한 후에 마이컴(10)은 바로 제2설정시간을 타이밍한다.After completing the first supplementary water supply operation, the microcomputer 10 immediately timings the second preset time.
제2설정시간은 5초 정도로 정해질 수 있는 값으로써 앞에서 설명한 제1설정시간과 마찬가지로 특정되는 값은 아니다. 단지 저수조에 급수된 세탁수가 안정상태에 이르는데 소요되는 시간이면 충분하다.The second set time is a value that can be set to about 5 seconds and is not a value specified like the first set time described above. Only the time required for the wash water supplied to the reservoir to reach a steady state is sufficient.
마이컴(10)에 의해 제2설정시간이 타이밍되는 기간내에 수위센서(19)는 저수조의 수이를 센싱하여 상기 마이컴에 제공하게 되며, 이에 따라 마이컴은 현재 측정되어 입력되는 수위값이 설정수위값에 도달하였는지 여부를 판단한다.The water level sensor 19 senses the water of the reservoir and provides it to the microcomputer within the period in which the second set time is timingd by the microcomputer 10. Accordingly, the microcomputer currently measures and inputs the water level value to the set water level value. It is determined whether it has reached.
그 판단결과 아직 설정수위에 이르지 못한 것으로 판단되면 처음의 세탁수 보충여부 판단과정을 거쳐 그 판단결과에 따른 세탁수 보충을 위한 급수밸브의 온 동작과 함께 다시 제2설정시간을 타이밍하게 될 것이다. 그러나 보충수 급수후 측정된 수위값이 설정수위값에 도달하였으면 마이컴(10)은 모터를 구동시켜 내부의 세탁프로그램에 따라 일련의 세탁운전을 진행하게 된다.As a result of the determination, if it is determined that the set water level has not yet been reached, the second set time will be re-timed along with the ON operation of the water supply valve for refilling the wash water according to the first wash water replenishment determination process. However, if the water level value measured after the supplementary water supply reaches the set water level value, the microcomputer 10 drives the motor to perform a series of washing operations according to the internal washing program.
이러한 드럼세탁운전중 세탁수 부족에 따른 보충 제어과정을 단계별로 요약 하면 다음과 같다.The step-by-step summary of the replenishment control process according to the lack of wash water during the drum washing operation is as follows.
제1단계에서는 세탁운전중 수위센서로부터 입력되는 저주조의 수위를 설정수위에 비교하여 세탁수 보충여부를 판단한다.In the first step, it is determined whether the washing water is refilled by comparing the level of the low casting input from the water level sensor during the washing operation to the set water level.
제2단계에서는 상기 제1단계의 실행에 의해 세탁수의 보충이 요구되면 급수밸브의 온과 동시에 제1설정시간(15초)을 타이밍한다.In the second step, when replenishment of the washing water is required by the execution of the first step, the first set time (15 seconds) is timingd at the same time as the water supply valve is turned on.
제3단계에서는 상기 제2단계의 제1설정시간의 타이밍이 완료되면 급수밸브의 오프와 동시에 드럼모터를 정지하고 제2설정시간을 타이밍한다.In the third step, when the timing of the first set time in the second step is completed, the drum motor is stopped and the second set time is timingd at the same time as the water supply valve is turned off.
제4단계에서는 상기 제3단계의 제2설정시간 종료전에 보충후의 급수수위를 감지하여 설정수위에 도달하지 않았으면 처음으로 돌아가 재급수 및 타이밍을 수행하고 설정수위에 도달하였으면 세탁운전을 재개한다.In the fourth step, the water supply level after refilling is detected before the end of the second setting time in the third step, and if the water level is not reached, the flow returns to the beginning and the water supply and timing are performed. When the water level is reached, the washing operation is resumed.
이상에서 설명한 바와 같은 본 발명은 드럼세탁기의 저수조의 수위가 낮아져서 보충수를 공급하게 되는 경우 그 부족분에 대해 정확하게 보충급수할 수 있게 되므로 세탁보충수의 과도한 급수에 따라 세탁시간이 연장되는 것을 방지할 수 있고 또한 절수효과도 얻을 수 있게 된다.As described above, the present invention, when the level of the water tank of the drum washing machine is lowered to supply the replenishment water, can accurately replenish the shortage thereof, thereby preventing the washing time from being extended due to excessive water supply of the washing replenishment water. It is also possible to obtain a water saving effect.
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