WO2023132452A1

WO2023132452A1 - Washing machine and method for controlling same

Info

Publication number: WO2023132452A1
Application number: PCT/KR2022/017197
Authority: WO
Inventors: 김대환; 함정윤; 강민희; 박동근; 이송재; 이완희
Original assignee: 삼성전자 주식회사
Priority date: 2022-01-05
Filing date: 2022-11-04
Publication date: 2023-07-13
Also published as: KR20230106201A

Abstract

A device according to an embodiment of the present disclosure relates to a wishing machine comprising: a first heater for heating wash water; a second heater for heating air; a blowing fan for supplying the air into a drum; a memory for storing one or more programs; and a controller which is electrically connected to the first heater, the second heater, the blowing fan, and the memory, and executes one or more instructions of the program stored in the memory, wherein the controller performs a washing stroke, a first rinse process, a second rinse process, a dehydration process, and a dry process, successively, wherein the second rinse process includes an operation of heating the wash water through the first heater and an operation of rotating the drum, and the dehydration process may include an operation of heating the air through the second heater in at least a part of a section on the basis of a rotation speed of the drum, and an operation of supplying the heated air into the drum by using the blowing fan.

Description

Washing machine and its control method

The present disclosure relates to a washing machine and a control method thereof.

A washing machine is an electronic device that includes a drum and removes contamination from laundry using water and detergent. The washing machine uses a motor as a main power source to perform a washing process, a rinsing process, and a spin-drying process, thereby removing contaminants from laundry put into the drum and also removing moisture contained in the laundry during the washing process. Types of washing machines typically include a drum-type washing machine and an electric washing machine. Laundry cleaned by the washing machine may be naturally dried by solar heat or air, but recently, laundry may be easily and conveniently dried using a drying machine. The drying device is an electronic device including a drum and removing moisture from laundry using one or more heaters.

Meanwhile, the drying process may be performed by a washing machine. In this case, the washing machine may perform a drying process following the washing process, the rinsing process, and the spin-drying process. In order to perform the drying process, a washing machine capable of performing the drying process may further include various components different from typical washing machines. A washing machine capable of performing a drying process may include, for example, a drying heater for heating air and a fan for supplying heated air to the inside of a drum. Further performs additional operations different from the device.

An object of the present disclosure is to provide an electronic device and method for heating or maintaining the temperature of laundry above a certain temperature in order to improve energy efficiency and time efficiency in a drying process.

An electronic device according to an embodiment of the present disclosure is a washing machine, including a first heater for heating wash water, a second heater for heating air, a blower fan for supplying the air to the inside of a drum, and one or more programs. A memory for storing and a controller electrically connected to the first heater, the second heater, the blowing fan, and the memory and executing one or more commands of a program stored in the memory, wherein the controller comprises a washing cycle; A first rinsing process, a second rinsing process, a spin-drying process, and a drying process are sequentially performed, and the second rinsing process includes heating the wash water through the first heater and rotating the drum. In the dehydration step, the operation of heating the air through the second heater in at least a part of the section based on the rotational speed of the drum, and supplying the heated air into the drum using the blowing fan Actions may be included.

A control method according to another embodiment of the present disclosure is a control method of a washing machine including a first heater for heating wash water, a second heater for heating air, and a blowing fan for supplying the air into a drum. receiving a washing course including a washing process, a first rinse process, a second rinse process, a spin-drying process, and a drying process; based on the received wash course, the washing process, the first rinse process, and the first rinse process 2. An operation of controlling the rinsing process, the spin-drying process, and the drying process to be sequentially performed, wherein the second rinsing process includes an operation of heating the wash water through the first heater and an operation of rotating the drum The dehydration step includes an operation of heating the air through the second heater in at least a part of a section based on a rotational speed of the drum, and introducing the heated air into the drum using the blower fan. It may include the operation of supplying.

The present disclosure may improve energy efficiency and time efficiency in a drying process by heating or maintaining the temperature of the laundry at a predetermined temperature or higher before starting the drying process.

Effects obtainable in the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned are common knowledge in the art to which exemplary embodiments of the present disclosure belong from the following description. can be clearly derived and understood by those who have That is, unintended effects according to the implementation of the exemplary embodiments of the present disclosure may also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

1 is a block diagram of a washing machine according to an embodiment of the present disclosure.

2 is a flowchart illustrating an entire process of a washing machine applied to an embodiment of the present disclosure.

FIG. 3 is a flowchart for explaining an embodiment applied to the second rinsing process of FIG. 2 .

FIG. 4 is a flowchart for explaining another embodiment applied to the second rinsing process of FIG. 2 .

FIG. 5 is a flowchart for explaining an embodiment applied to the dehydration process of FIG. 2 .

FIG. 6 is a flowchart for explaining another embodiment applied to the dehydration process of FIG. 2 .

7 is a reference diagram expressing the entire stroke of FIG. 2 as a time-RPM graph.

8 is a perspective view of a washing machine applied to an embodiment of the present disclosure.

9 is a cross-sectional view of a washing machine applied to an embodiment of the present disclosure.

Reference is made to the accompanying drawings in the following description, and specific examples that may be practiced are shown as examples within the drawings. Also, other examples may be utilized and structural changes may be made without departing from the scope of the various examples.

Hereinafter, with reference to the drawings, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily carry out the present disclosure. However, the present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. In connection with the description of the drawings, the same or similar reference numerals may be used for the same or similar elements. Also, in the drawings and related descriptions, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The washing machine 100 according to an embodiment of the present disclosure includes a controller 110, a memory 120, a transceiver 130, a sensor 140, a driving unit 150, a blowing fan 160, and a first heater 171. ), and/or a second heater 172. A plurality of components constituting the washing machine 100 may be electrically or functionally connected to each other.

According to one embodiment of the present disclosure, the controller 110 in the washing machine 100 may include a storage and processing circuit to support the operation of the washing machine 100 . The storage and processing circuitry may include storage such as non-volatile memory (eg, flash memory or other electrically programmable ROM configured to form a Solid State Drive (SSD)), volatile memory (eg, static or dynamic RAM), and the like. can include Processing circuitry within controller 110 may be used to control the operation of laundry machine 100 . The processing circuitry comprises one or more microprocessor(s), microcontroller(s), digital signal processor(s), baseband processor(s), power management section(s), audio chip(s), application specific circuit(s) etc. can be based on. The transceiver 130 and memory 120 described below are provided as functional elements that perform a specific function or operation as at least a part of the controller 110 as one aspect of the controller 110, or perform independent functions or operations. As a subject that performs, it may be provided as a separate hardware component.

According to one embodiment of the present disclosure, the memory 120 of the washing machine 100 includes operations corresponding to or including any of the methods and/or procedures illustratively described in this disclosure. It may include a memory area for one or more controllers 110 to store variables used in protocols, configuration, control, and other functions. Furthermore, the memory 120 may include non-volatile memory, volatile memory, or a combination thereof. Furthermore, memory 120 may interface with a memory slot that allows removable memory cards of one or more formats (eg, SD card, memory stick, compact flash, etc.) to be inserted and removed.

According to one embodiment of the present disclosure, the transceiver 130 may include a wireless communication module or an RF module. The wireless communication module may include, for example, Wi-Fi, BT, GPS or NFC. For example, the wireless communication module may provide a wireless communication function using a radio frequency. Additionally or alternatively, the wireless communication module includes a network interface or modem for connecting the washing machine 100 to a network (eg, Internet, LAN, WAN, telecommunication network, cellular network, satellite network, POTS or 5G network, etc.) can include The RF module may be responsible for transmitting and receiving data, for example, transmitting and receiving RF signals or called electronic signals. For example, the RF module may include a power amp module (PAM), a frequency filter, or a low noise amplifier (LNA). In addition, the RF module may further include components for transmitting and receiving electromagnetic waves in free space in wireless communication, for example, conductors or wires.

According to one embodiment of the present disclosure, the sensor unit 140 detects an operating state of the washing machine 100, for example power or temperature, or an external environment state, for example a user state, and returns to the detected state. A corresponding electrical signal or data value may be generated. For example, the sensor 140 may obtain diagnostic information about the washing machine 100 by detecting an operating state or a surrounding environment of the washing machine 100 while a washing course is being performed. Diagnosis information refers to information about components constituting the washing machine 100 (eg, a drum, a tub, a water supply valve, a door, etc.) and states and/or abnormalities. To this end, the sensor 140 may include at least one of a speed sensor, a weight sensor, a temperature sensor, a water level sensor, a detergent sensor, a leak sensor, a humidity sensor, a turbidity sensor, a door sensor, a vibration sensor, and a valve sensor. Each of the sensors may be implemented as a physically separated separate device or may be integrated and implemented as a single device. The speed sensor may detect rotational speed, rotational angle, rotational direction, etc. of the motor and/or drum. The weight sensor may detect the weight of the drum. The temperature sensor may detect a temperature inside the tub, a temperature inside the drum, and a temperature around the washing machine 100 . The water level sensor may detect the water level or flow rate of washing water. The detergent sensor may detect the remaining amount or type of detergent. The water leakage sensor may detect water leakage. A humidity sensor can detect the amount of moisture in the air. A turbidity sensor can detect the turbidity of a liquid. The door sensor may detect whether the door is opened or closed. The vibration sensor may detect the degree of vibration of the laundry machine 100 as it operates. The valve sensor may detect whether a water supply valve or a drain valve is abnormal.

According to one embodiment of the present disclosure, the driving unit 150 receives a control command from the controller 110 and may include an inverter and/or a motor. Also, the driving unit 150 may receive a control command from the controller 110 and operate the blowing fan 160 in response to the received control command. While the drum is rotated by the driving unit 150, the laundry inside the drum is tumbled by repeating ascending and descending movements, and contaminants attached to the laundry may be separated through such tumbling.

According to one embodiment of the present disclosure, the blowing fan 160 may operate in at least a part of the entire stroke of the washing machine 100 to improve cleaning power, spin-drying power, or drying power. For example, the driving unit 150 may facilitate the separation of contaminants by rotating the drum while operating the blowing fan 160 . In addition, a strong air volume introduced into the drum can support effective separation of contaminants attached to the tumbling laundry. Also, the blowing fan 160 may introduce air heated by a heater into the drum according to operation. In this way, the surface of the laundry may be dried by the heated air.

According to one embodiment of the present disclosure, the first heater 171 heats water accommodated in the tub in order to heat water flowing inside the washing machine 100 . The first heater 171 may be operated so that the temperature of the water accommodated in the tub is heated up to a temperature set by a user. Water (hot water or hot water) heated by the first heater 171 flows into the tub or drum through the supply pipe. Laundry can be heated by hot water. Such heaters may be referred to as laundry heaters or tub heaters. Also, in the present disclosure, water flowing inside the washing machine 100 may be referred to as washing water.

According to one embodiment of the present disclosure, the second heater 172 heats the air passing through the drying duct to heat the air flowing inside the washing machine 100 . Air heated while passing through the drying duct, that is, hot air, is introduced into the drum by the blowing fan 160. Laundry can be dried by hot air. Such heaters may be referred to as dry heaters or duct heaters.

According to an embodiment of the present disclosure, the controller 110 may sequentially perform a washing process, a first rinsing process, a second rinsing process, a spin-drying process, and a drying process. Each stroke is for washing, rinsing, spinning, and drying laundry and may include one or more associated operations. One or more operations associated with each stroke are stored in the memory 120 and are realized based on control commands from the controller 110 .

According to an embodiment of the present disclosure, the first rinsing process and the second rinsing process are distinguished from each other due to different constituting operations. The first rinsing cycle is a typical rinsing cycle and includes an operation of supplying water into the drum and rotating the drum through a motor. In contrast, the second rinsing process includes an operation of heating water through a heater, preferably the first heater 171, before supplying water into the drum, or by supplying water into the drum and then heating the water through the first heater ( 171) and/or heating the tub through the second heater 172 to increase the temperature in the drum. That is, the second rinsing process is different from the first rinsing process in that it further includes an operation of increasing the temperature inside the tub or drum and/or the temperature of the laundry by using one or more heaters. For example, the second rinsing process may include preheating the water in the tub with the first heater 171 before supplying the water into the drum. As another example, in the second rinsing cycle, after supplying water into the drum, the tub is heated through the first heater 171 and/or the second heater 172, thereby heating air and laundry in the drum. can include At this time, in another example, the water supplied into the drum may also be provided as hot water heated by the first heater 171 . Meanwhile, in one embodiment, the first heater 171 may be disposed on a lower inner surface of the tub. The first heater 171 may be disposed adjacent to or in direct contact with the water contained in the tub. Water contained in the tub may be directly heated by the first heater 171 . When the second heater 172 operates together, the air around the second heater is heated as the second heater 172 operates, and the air (warm air or hot air) heated by the blowing fan 160 is blown inside the tub. of laundry can be supported.

According to one embodiment of the present disclosure, while the second rinsing cycle is performed, the motor and/or the drum are controlled to rotate at a predetermined reference RPM or less. Here, the preset reference RPM may be set to 200 RPM, but is not limited thereto. The reference RPM in the section in which the second rinsing process is performed may be set to a value smaller than the reference RPM for determining the section in which the second heater 172 operates in the section in which the dehydration process is performed, which will be described later. For example, the second rinsing cycle may be performed at 200 RPM or less, and the second heater 172 may be operated at 400 RPM or less in the dehydration cycle.

In this way, the surface tension of the laundry is reduced by the operation of rinsing the air in the drum and/or the laundry with heated water, that is, hot water or hot water. As the surface tension is reduced, water can be easily removed from the laundry in the subsequent dehydration step, which improves the dehydration rate and energy efficiency in the dehydration step. Furthermore, as the dehydration rate in the dehydration step is improved, the drying rate and energy efficiency in the drying step are also improved.

According to one embodiment of the present disclosure, the spin-drying process includes a plurality of spin-drying operations. The plurality of dehydration operations may include, for example, a first dehydration operation, a second dehydration operation, ..., an Nth dehydration operation (N is a natural number of 2 or greater). As the order of the dewatering operation increases, the rotation speed of the motor and/or the drum can be adjusted to a larger value. In addition, as the order of the dehydration operation increases, the time during which each order of the dehydration operation is performed may be adjusted to a larger value. For example, when N is 3, the rotation speed in the first dehydration operation increases to a maximum RPM of 400 RPM or less, and the rotation speed in the second dehydration operation increases to a maximum RPM between 400 and 800 RPM, The rotational speed in the third dehydration operation may be set to rise to a maximum RPM of 1200 RPM or more. Each maximum RPM may be preset based on user input, but is not limited thereto. Meanwhile, after the Nth dehydration operation is finished, the controller 110 adjusts the rotational speed to 0 RPM and performs a fabric unwinding operation.

According to an embodiment of the present disclosure, the controller 110 may perform the fabric unwinding operation not only after the entire spin-drying operation is finished, but also in at least a partial section between a plurality of spin-drying operations. A fabric unwinding operation performed in at least a partial section between spin-drying operations may be referred to as a first fabric unwinding operation, and a fabric unwinding operation after the entire spin-drying operation is finished may be referred to as a second fabric unwinding operation. The first fabric unwinding operation is not limited to being performed in one section, and may be performed in one or more sections between a plurality of spin-drying operations. A section in which the first fabric unwinding operation is performed may be preset based on a user input, but is not limited thereto. While the fabric unwinding operation is performed, the controller 110 controls the motor and/or the drum to have a rotational speed of 200 RPM or less.

According to an embodiment of the present disclosure, the controller 110 may perform a first fabric unwinding operation between an Nth dehydration operation and an N−1st dehydration operation among a plurality of dehydration operations. In other words, it may be determined that the first fabric unwinding operation is performed between, for example, the Nth dehydration operation and the N−1st dehydration operation. The Nth dehydration operation is the final dehydration operation, and the controller 110 controls the motor or rotates the drum at a maximum RPM of at least 1200 RPM or more. Before this final spin-drying operation, the controller 110 performs a first fabric unwinding operation. At the same time as lowering the RPM to 200 RPM or less in the first fabric unwinding operation, the controller 110 may heat the laundry to be tumbled using a second heater 172 and a blowing fan 160 to be described later. Before the laundry is dewatered at high speed in the final dehydration operation, the laundry is heated through the first fabric unwinding operation, and as the temperature of the laundry increases, the dehydration rate and the drying rate can be remarkably improved.

Also, according to an embodiment of the present disclosure, the controller 110 may operate the blowing fan 160 during the dehydration process. The blowing fan 160 may advantageously be operated throughout the entire period of the spin-drying process. Accordingly, the blowing fan 160 provides heated air into the drum in a section in which the second heater 172 is operating, and provides unheated air into the drum in a section in which the second heater 172 is not in operation. do.

Here, the second heater 172 may be operated by the controller 110 in at least a part of the entire section in which the dehydration step is performed. The operating period of the second heater 172 may be determined based on the rotational speed of the motor and/or the drum. The rotational speed of the motor and/or drum may be detected or determined by a connected sensor 140 . When the rotational speed of the motor and/or the drum is determined to be less than or equal to the preset reference RPM, the second heater 172 is operated in a section in which the rotational speed is determined to be less than or equal to the reference RPM. Here, the reference RPM may be preferably set to 400 RPM, but is not limited thereto. At 400 RPM or more, the laundry comes into close contact with the inner circumferential surface of the drum in a state of being attached to the cloth, so the second heater 172 operates at a low speed of 400 RPM or less. That is, as the drum rotates at a low speed, the second heater 172 operates in a section where laundry is tumbled, and the air heated by the second heater 172 evenly contacts the laundry being tumbled. This contributes to evenly increasing the temperature of the laundry. In addition, in the section where the laundry is in close contact with the inner surface of the drum in a cloth-attached state, even if the air heated by the first heater 171 is supplied, it does not evenly contact the laundry and bypasses the drum, thereby bypassing the energy aspect. becomes inefficient. As such, the washing machine 100 according to an embodiment of the present disclosure provides an energy-efficient laundry spin-drying function by determining a section in which the second heater 172 operates based on the rotational speed of the motor and/or the drum. can do. Functions of the washing machine 100 described above may be understood with reference to the flowcharts of FIGS. 2 to 6 and the reference diagram of FIG. 7 .

FIG. 2 is a flowchart illustrating an entire process of the washing machine 100 applied to an embodiment of the present disclosure.

According to an embodiment of the present disclosure, the controller 110 may perform a washing process (S110).

According to an embodiment of the present disclosure, the controller 110 may supply water and detergent to the tub. The controller 110 may open a water supply valve to supply water to the tub based on the measured amount of water. By opening the water supply valve, water may be supplied to the tub via the detergent box. The controller 110 may rotate the drum for washing. The controller 110 may control the driving unit 150 to rotate the drum at a low speed (eg, 45 RPM to 60 RPM).

According to an embodiment of the present disclosure, the controller 110 may perform a first rinsing process (S120).

According to an embodiment of the present disclosure, the controller 110 may supply water to the tub and rotate the drum at a low speed for rinsing. The controller 110 may perform the rinsing operation two or more times while changing the RPM or rotation direction in the first rinsing stroke section, but is not limited thereto. In one embodiment, in the first rinsing cycle, unheated water may be supplied regardless of a heater, particularly the first heater 171 . In other words, in the first rinsing cycle, the heater does not operate, and the water supplied to the washing machine 100 is supplied into the tub or drum as it is.

According to an embodiment of the present disclosure, the controller 110 may perform a second rinsing process (S130).

According to an embodiment of the present disclosure, the controller 110 may supply water heated by the first heater 171 to the tub into the drum and rotate the drum at a low speed. This is to heat the laundry. Unlike the first rinsing process, the second rinsing process uses water heated by the first heater 171 during rinsing. The second heater 172 heats the water in the tub before entering the second rinsing cycle or during the second rinsing cycle. The controller 110 may pre-heat water in the tub with the first heater 171 before supplying water into the drum, and supply the heated water into the tub in the second rinsing cycle section, for example. The controller 110, for another example, in the second rinsing cycle section, after supplying water into the drum, heats the tub through the first heater 171 and/or the second heater 172, thereby cleaning the inside of the drum. It can heat air and laundry.

According to one embodiment of the present disclosure, the controller 110 rotates the drum at a low speed, and may evenly mix the heated water and the laundry. Laundry is warmed to the inside as well as the surface by the heated water. In this way, when the laundry is rinsed with heated water before the dehydration step, the laundry is significantly heated and the surface tension of bound water and free water contained in the laundry is reduced. Since the water contained in the laundry having a reduced surface tension can be more easily released from the laundry in the spin-drying step, the spin-drying rate in the spin-drying step is increased. As the dehydration rate increases, the amount of drying required in the subsequent drying cycle decreases, so the drying cycle time can be shortened, and since the temperature of the laundry is already high when entering the drying cycle, the drying energy required to reach the drying target temperature can be reduced. Efficiency is also improved.

According to an embodiment of the present disclosure, the controller 110 may perform a dehydration process (S140).

According to one embodiment of the present disclosure, the controller 110 may rotate the drum at high speed. The spin-drying process includes two or more spin-drying operations. That is, the dehydration process may include a first dehydration operation, a second dehydration operation, ..., an Nth dehydration operation (N is a natural number of 2 or more). Meanwhile, the spin-drying process may include a fabric unwinding operation. The fabric unwinding operation can be divided into a first fabric unwinding operation performed between spin-drying operations and a second fabric unwinding operation. The first fabric unwinding operation is performed in at least one section between spin-drying operations, and the second fabric unwinding operation is performed after the Nth spin-drying operation is completed.

According to one embodiment of the present disclosure, the first fabric unwinding operation may be performed between adjacent spin-drying operations. The first fabric unwinding operation may be performed, for example, between the Nth dehydration operation and the N−1st dehydration operation. The maximum RPM and/or execution time of the dewatering operation increases as the order increases. For example, the maximum RPM of the second dehydration operation may be set higher than that of the first dehydration operation. For another example, the execution time of the second dehydration operation may be set longer than that of the first dehydration operation. For another example, the maximum RPM and execution time of the second dehydration operation may be set to greater values than those of the first dehydration operation.

According to one embodiment of the present disclosure, the controller 110 may operate the blowing fan 160 while the dewatering process is performed. For example, the controller 110 may operate the blowing fan 160 in all sections where the spin-drying process is performed. Meanwhile, according to an embodiment of the present disclosure, the controller 110 may operate the second heater 172 in at least a part of all sections in which the dehydration process is performed. In a section where the second heater 172 is operating, the controller 110 may supply heated air to the inside of the drum by controlling the blowing fan 160 . In a section where the second heater 172 is not operating, the controller 110 may control the blowing fan 160 to supply unheated air to the inside of the drum. According to one embodiment of the present disclosure, the operating section of the second heater 172 is determined based on the rotational speed of the motor and/or drum. For example, when the RPM of the motor and/or the drum is determined to be less than the reference value, the controller 110 may supply heated air to the drum by controlling the second heater 172 . Here, the reference value may be set to 400 RPM. When the drum rotates at 400 RPM or more, laundry adheres to the inner surface of the drum. This condition is referred to as attaching a cloth. If the second heater 172 operates in the state of attaching the cloth, even if heated air is supplied to the inside of the drum using the blowing fan 160, the heated air cannot pass between the laundry and is bypassed. do. That is, no matter how heated air is supplied, only one side of the laundry that is in close contact with the inner circumferential surface of the drum is in contact, and it is difficult to contact the other side. Accordingly, a temperature difference between one side and the other side of the laundry is generated, and it is difficult to expect an energy benefit from supplying heated air.

According to one embodiment of the present disclosure, air heated by using the second heater 172 is supplied only while the motor or the drum rotates below a reference value (eg, 400 RPM). At this time, the cloth sticking phenomenon does not occur, and the laundry is tumbled. That is, by supplying air heated by the second heater 172 at an RPM at which laundry can be tumbled, laundry can be effectively heated.

According to an embodiment of the present disclosure, the controller 110 may perform a drying process (S150).

According to one embodiment of the present disclosure, the controller 110 may operate the second heater 172 to heat the air inside the drum. For example, the controller 110 may control the driving unit 150 to rotate the drum while maintaining the operation of the second heater 172 when the temperature of the air inside the tub reaches a preset value.

According to an embodiment of the present disclosure, when the first rinsing cycle is finished, the controller 110 may provide water heated by the first heater 171 to the inside of the tub or drum (S131a). According to another embodiment of the present disclosure, when the first rinsing process is completed, the controller 110 supplies water to the inside of the tub or drum and heats the water inside the tub or drum using the first heater 171. may be Here, the amount of water supplied into the tub or drum is set smaller than the amount of water supplied in other rinsing operations included in the first rinsing cycle. That is, the amount of water supplied in the second rinsing cycle is set to the minimum amount among rinsing operations. This is because the time required to heat the laundry increases as the amount of water supplied increases. Water supplied or to be supplied into the tub or drum may be heated to a preset target temperature or for a preset time by the first heater 171 . Here, the target temperature may be set based on the temperature of the thermistor, but is not limited thereto.

According to one embodiment of the present disclosure, the controller 110 may adjust the rotational speed of the drum (S132a). Here, the rotational speed of the drum may be adjusted to 200 RPM or less. 200 RPM may be preset as a reference RPM during the second rinsing cycle. By rotating the drum at 200 RPM or less, the internal temperature of the laundry being tumbled together with the heated water can be uniformly raised. The controller 110 may control the rotational speed of the drum after the heated water is supplied, or may control the rotational speed of the drum while heating the water in the tub or drum.

According to an embodiment of the present disclosure, the controller 110 finishes or continues the second rinsing process based on the temperature condition or the time condition (S133a). For example, the controller 110 heats the laundry through the first heater 171 until the temperature of the laundry or drum reaches a preset temperature, and finishes the second rinse cycle when the temperature of the laundry or drum reaches the preset temperature. , can enter the dehydration process. For another example, the controller 110 may heat the laundry using the first heater 171 for a preset time, and when the preset time elapses, the second rinse cycle may be completed and the spin-drying cycle may be entered.

FIG. 4 is a flowchart for explaining another embodiment applied to the second rinsing process of FIG. 2 . S131b and S132b correspond to S131a and S131a in FIG. 3, respectively, and repeated descriptions are omitted.

According to an embodiment of the present disclosure, the controller 110 additionally operates the second heater 172 based on the temperature condition or finishes the second rinsing process (S133b and S134b). For example, the controller 110 supplies heated or unheated water by the first heater 171 and heats laundry inside the drum through the first heater 171 for a preset time. As such, a section in which the first heater 171 operates is referred to as a first section. The controller 110 checks the temperature through the sensor 140 at the end of the first section, and operates the first and second heaters 172 simultaneously when the checked temperature is lower than a preset target value. As such, a section in which the first and second heaters 172 operate together is referred to as a second section. In other words, the period in which the second rinse cycle is performed may include a first period and a second period, and the second period is when the temperature inside the laundry, tub, or drum is lower than the target value at the end of the first period. can be provided in That is, if the temperature inside the laundry, tub or drum is equal to or higher than the target value at the end of the first section, the second section may be omitted.

According to an embodiment of the present disclosure, the controller 110 may perform dehydration operations up to the N−1th dehydration operation among all Nth dehydration operations (S141a). The dehydration process may include a plurality of dehydration operations, and up to Nth dehydration operations (where N is a natural number equal to or greater than 2) may be performed. Each dewatering operation may be performed at a different rotational speed and/or execution time.

According to an embodiment of the present disclosure, the controller 110 may perform a fabric unwinding operation after the N-1st spin-drying operation (S142a). Upon completion of the N-1st spin-drying operation, the controller 110 transmits a control command for performing a fabric unwinding operation to the driving unit 150. The fabric unwinding operation of S142a is included in the first fabric unwinding operation. The first fabric unwinding operation refers to a fabric unwinding operation performed between adjacent spin-drying operations. While the first fabric unwinding operation is performed, the controller 110 may adjust the rotation speed of the motor and/or the drum to, for example, 200 RPM or less. Accordingly, the laundry that has adhered to the inner circumferential surface of the drum is separated from the inner circumferential surface and tumbled as the drum rotates. Since the rotational speed in the section where the first fabric unwinding operation is performed belongs to the range of the rotational speed at which the second heater 172 operates (eg, 0 to 400 RPM range), the controller 110 controls the first fabric unwinding operation. The second heater 172 may be operated in the entire section where the operation is performed. The air heated by the second heater 172 is supplied into the drum by the blowing fan 160 . The air supplied into the drum comes into contact with the tumbled laundry and evenly raises or maintains the temperature of the laundry. Meanwhile, the fabric unwinding operation may be terminated in response to elapse of a preset time, for example.

After completing the fabric unwinding operation, the controller 110 may perform the Nth dehydration operation (S143a). The Nth dehydration operation is the final dehydration operation, and the controller 110 rotates the drum at a high speed of up to 1200 RPM or more. When the rotational speed of the motor and/or drum is less than a preset reference value (eg, 400 RPM) during the section where the Nth dehydration operation is performed, the second heater 172 operates, but the preset reference value (eg, 400 RPM) For example, 400 RPM) or higher, the second heater 172 does not operate. However, even when the rotation speed of the motor and/or the drum is higher than the reference value, the blowing fan 160 may continue to operate. After the Nth spin-drying operation is completed, the controller 110 performs a fabric unwinding operation and a drying process.

FIG. 6 is a flowchart for explaining an embodiment applied to the dehydration process of FIG. 2 .

According to an embodiment of the present disclosure, the controller 110 may operate the blowing fan 160 in response to entering the spin-drying process (S141b). The blowing fan 160 may operate throughout the entire section in which the spin-drying process is performed. The controller 110 may supply air into the drum through the blowing fan 160 .

According to one embodiment of the present disclosure, the controller 110 may measure the rotation speed of the motor and/or the drum (S142b). One or more sensors 140 associated with the motor and/or drum may measure the rotational speed of the motor and/or drum, and the measured rotational speed is expressed in RPM. Measurement of the rotational speed may be performed at a constant time period or in real time, but is not limited thereto.

According to one embodiment of the present disclosure, when the rotational speed of the motor and/or the drum is detected to be equal to or less than a preset reference RPM, the controller 110 may operate the second heater 172 (S143b and S144b). In addition, when the rotational speed of the motor and/or the drum is detected as higher than a preset reference RPM, the controller 110 may not operate or stop the operation of the second heater 172 (S143b and S145b).

According to an embodiment of the present disclosure, the dehydration process is performed for a preset time, and when the preset time elapses, the controller 110 may finish the dehydration process and enter the drying process (S146b: Yes). When the preset time has not elapsed, the controller 110 continues the spin-drying process, measures the RPM at a constant time period or in real time, operates the second heater 172, or stops such an operation to wash the laundry, tub and/or Alternatively, the temperature inside the drum may be adjusted (S146b: No).

Referring to FIG. 7 , the entire process applied to an embodiment of the present disclosure includes a washing process, a first rinse process, a second rinse process, a dehydration process, and a drying process, and each process may be sequentially performed. there is.

The second rinse cycle is performed after the first rinse cycle. The second rinsing cycle is performed at a predetermined reference RPM or less (eg, 200 RPM or less). For example, in a section where the second rinse cycle is performed, the controller 110 supplies water to the inside of the tub or drum and heats the inside of the tub or drum through the first heater 171 to heat the laundry inside the drum. can As another example, in a section where the second rinsing cycle is performed, the controller 110 supplies water heated by the first heater 171 to the inside of the tub or drum, and supplies water heated by the first heater 171 to the inside of the tub or drum through the first heater 171. can be heated to heat the laundry inside the drum. During the second rinsing cycle, the controller 110 may rotate the drum at a predetermined reference RPM or less (eg, 200 RPM or less) to evenly mix the water or heated water and the laundry.

In response to the end of the second rinsing process, the controller 110 may perform a spin-drying process. The spin-drying process includes a plurality of spin-drying operations and a plurality of fabric unwinding operations. The dehydration operation may include, for example, first to Nth dehydration operations (where N is a natural number of 2 or greater). 7 exemplarily shows a case where N is 3. In this case, the first through N-1st dehydration operations may be performed, and the first fabric unwinding operation may be performed in response to the end of the N-1st dehydration operation. The first fabric unwinding operation may be performed in one or more intervals between dehydration operations, and in the corresponding interval, the controller 110 controls the motor and/or the drum to rotate at a certain RPM (eg, 200 RPM) or less. . The first fabric unwinding operation is advantageously performed immediately before the Nth spin-drying operation (ie, the final spin-drying operation). In the Nth spin-drying operation, the controller 110 rotates the drum at high speed and brings the laundry into close contact with the inner circumferential surface of the drum. Immediately before the final spin-drying operation is performed, the controller 110 performs a first fabric unwinding operation and sufficiently heats the laundry inside the drum through the second heater 172 . In the case of laundry heated through the first fabric unwinding operation, the dehydration rate in the final spin-drying operation is significantly higher than that of unheated laundry. After the Nth spin-drying operation is completed, the controller 110 performs a second fabric unwinding operation. The second fabric unwinding operation is an operation of removing the laundry from the inner circumferential surface of the drum before entering the drying cycle, and the controller 110 rotates the drum at a low speed (eg, 200 RPM or less).

Meanwhile, the blowing fan 160 may operate in all sections in which the dehydration step is performed, and the second heater 172 may operate in at least a part of all sections in which the dehydration step is performed. As described above, the second heater 172 may operate in the section where the first fabric unwinding operation is performed, but is not limited to the section. The controller 110 may determine a section in which the second heater 172 operates based on the rotation speed of the motor and/or the drum. When the rotational speed is equal to or less than a preset reference RPM (eg, 400 RPM), the controller 110 may determine the second heater 172 to operate. Here, the reference RPM is determined as a value at which laundry can be separated from the inner circumferential surface of the drum and tumbled.

As such, the apparatus and method according to an embodiment of the present disclosure, before entering the spin cycle, perform the second rinse cycle with hot water to increase the temperature of the laundry, and in the low RPM section of the spin cycle, the first heater The temperature of the laundry may be maintained or increased by pre-drying by the 171 and the blowing fan 160 . Also, in the pre-drying section, the controller 110 rotates the drum at a predetermined RPM or less so that the laundry does not adhere to the inner circumferential surface of the drum, and as a result, the laundry can have a wide contact surface with the hot air. As such, when a sufficiently high surface temperature and internal temperature are secured, the surface tension of the laundry is reduced and the dehydration rate is improved. As the dehydration rate is improved, the amount of moisture to be dried is reduced, so that the time required for the drying process can be shortened, and the phenomenon that laundry adheres to the inner circumferential surface of the drum after the dehydration process is completed can be prevented. In addition, as pre-drying is performed at low RPM in at least some of the sections during the dehydration process, overheating due to abnormal flow of circulating air in the drum caused by dehydration at high RPM can be prevented.

Hereinafter, a washing machine applied to the apparatus and method according to an embodiment of the present disclosure will be described as an example. However, it is not limited to the structure of the washing machine shown in FIGS. 8 and 9, and the location and size of each component may be changed as needed. Furthermore, among the components, additional components not used in the above-described apparatus and method according to an embodiment of the present disclosure may be omitted as necessary, and various embodiments of the present disclosure must be shown in FIGS. 8 and 9 It is not limited to a washing machine including all the components shown in .

8 is a perspective view showing the configuration of a washing machine applied to various embodiments of the present disclosure, and FIG. 9 is a cross-sectional view showing the configuration of a washing machine applied to various embodiments of the present disclosure.

8 and 9, the washing machine has a drum-shaped tub 11 installed inside the main body 10 to freshen water and rotatably installed inside the tub 11, and It includes a drum 12 in which a dewatering hole is formed. A motor 13 for rotating the drum 12 in a forward or reverse direction is installed at the bottom of the tub 11 to perform washing, first and second rinsing, spin-drying, and drying operations. A first heater 19 capable of heating the wash water supplied into the tub 11 is installed inside the lower side.

An opening 14 is formed in front of the tub 11 and the drum 12 so that the user can take out laundry from the front of the main body 10, and a door ( 15) is installed.

At the top of the tub 11, a detergent supply device 18 for supplying detergent to the inside of the tub 11, a steam generator 30 for supplying steam to the inside of the tub 11, the tub 11 and A water supply device 20 for supplying water to the steam generator 30 is installed.

The detergent supply device 18 has an accommodation space for receiving detergent therein, and is installed on the front side of the main body 10 so that the user can easily insert the detergent.

The water supply device 20 includes a water supply pipe 21 for supplying water to the tub 11 and a water supply valve 22 installed in the water supply pipe 21 to control water supply through the water supply pipe 21 . The water supply pipe 21 is connected to the detergent supply device 18 so that water supplied from the outside can be supplied toward the detergent supply device 18. A separate connection pipe 23 is installed between the detergent supply device 18 and the tub 11 so that water passing through the detergent supply device 18 can be supplied to the tub 11 . This allows the water supplied to the inside of the tub 11 to pass through the detergent supply device 18 so that the detergent inside the detergent supply device 18 can be supplied to the tub 11 in a dissolved state in water. .

The water supply device 20 is provided with a steam water supply pipe 24 for supplying water to the steam generator 30 as well as to the detergent supply device 18, and is installed in the steam water supply pipe 24 to supply water to the steam generator 30. It includes a steam valve 25 that controls water supply. On the other hand, although the water supply valve 22 and the steam valve 25 are configured separately, various embodiments of the present disclosure are not limited thereto, and the water supply valve 22 and the steam valve ( 25) can also be integrated.

The steam generator 30 includes a U-shaped third heater (steam heater, 32) installed therein to instantaneously heat passing water to generate steam at a high temperature of 100° C. or higher, and one side of the steam generator 30 A temperature sensor 34 installed in the steam generator 30 to detect the temperature of the steam generator 30, a steam supply pipe 36 extending from the steam generator 30 to the drying duct 42, and an outlet of the steam supply pipe 36 It includes a spray nozzle 38 installed in.

Here, although the third heater 32 is mounted inside the steam generator 30 as an example, various embodiments of the present disclosure are not limited thereto and the third heater 32 is installed inside the steam generator 30. Even if an external heater is installed in contact with the upper or lower outer surface of the steam generator 30 or the third heater 32 is installed in a structure surrounding the outer circumferential surface of the steam generator 30, the same objects and effects as those of various embodiments of the present disclosure can be achieved. Of course you can.

and a drying device 40 for drying the laundry after the spin-drying operation of the laundry. The drying device 40 includes a blowing fan 41, a drying duct 42, and a condensation duct 43. Here, the blowing fan 41 is installed above the tub 11, and the drying duct 42 has an air inlet formed above the outlet 41b of the blowing fan 41 and the opening 14 of the tub 11 ( 45) is configured to connect between them. In addition, the condensation duct 43 is configured at the rear of the tub 11 to connect between the air outlet 46 formed at the rear lower portion of the tub 11 and the intake port 41a of the blowing fan 41 .

The drying device 40 includes a second heater 44 installed inside the drying duct 42 to supply hot air to the inside of the tub 11, and a condensation duct 43 for wet steam generated through drying of laundry. It includes a condensing device installed in the condensation duct 43 so that moisture can be condensed and removed in the process of passing through the condensation duct.

In this configuration, the air blown by the operation of the blowing fan 41 is heated through the second heater 44 and then supplied to the inside of the tub 11 so that the laundry inside can be heated and dried. Moisture in the air can be removed while the wet steam generated through drying is sucked toward the blowing fan 41 through the condensation duct 43.

The condensing device includes a cooling water spray nozzle 53 installed inside the condensation duct 43 and spraying cooling water into the condensation duct 43, and a water supply device 20 to supply cooling water to the cooling water spray nozzle 53. It includes a cooling water supply pipe 54 connected to. The configuration of this condensing device allows the cooling water sprayed from the cooling water spray nozzle 53 at the top to flow down along the inner surface of the condensation duct 43 to the bottom so that the contact between the wet air rising from the bottom and the cooling water increases, so that the dehumidification effect is achieved. that could be improved.

In addition, various embodiments of the present disclosure include a drainage device 50 for draining water inside the tub 11 . The drainage device 50 includes a drain pipe 51 connected to the lower portion of the tub 11 to guide water in the tub 11 to the outside, and a drain pump 52 installed in the drain pipe 51.

When laundry is put inside the drum 12 and the washing machine is operated while detergent is injected into the detergent supply device 18, the water supply valve 22 of the water supply device 20 opens and water is supplied toward the detergent supply device 18. It is done. Detergent inside the detergent supply device 18 is dissolved by wash water supplied to the tub 11 via the detergent supply device 18 and supplied to the tub 11 .

After the water supply operation is completed, the first heater 19 is operated to heat the wash water filled in the tub 11, and after a certain period of time has elapsed and heated to the temperature required for washing, the drum 12 is driven by the motor 13. It rotates in the forward or reverse direction by driving. At this time, as the laundry is moved by the lift formed inside the drum 12, the laundry is washed by the frictional force with the drum 12 and the dissolving force of the detergent. If the user selects the steam course, the steam valve 25 opens while the washing water is heated by the first heater 19, and water is supplied toward the steam generator 30 through the steam water supply pipe 24. , Wash water supplied to the steam generating device 30 is instantaneously heated by the third heater 32 to generate steam at a high temperature of 100° C. or higher. This high-temperature steam is supplied into the tub 11 through the steam supply pipe 36 and the drying duct 42 and sprayed onto the heated wash water and laundry inside the tub 11 through the first heater 19 . Therefore, the temperature of the laundry sufficiently wet with the detergent solution and water is rapidly raised by the high-temperature steam, and the detergent solution contained in the laundry is activated, and when the supply of steam is stopped after a certain period of time, the drum ( 12) is rotated by the drive of the motor 13, and the laundry is rapidly decontaminated by the frictional force between the drum 12 and the active state of the detergent solution, thereby improving washing performance.

After the washing operation is completed, a rinsing operation of repeating spin-drying and supplying water is performed. Water supplied to the inside of the tub 11 while rinsing is performed through the water supply pipe 21 as the water supply valve 22 is opened, and drainage of the tub 11 is performed by the operation of the drain pump 52 to drain the water pipe ( 51) through

When final spin-drying is performed after rinsing, the drain pump 52 operates and the drum 12 rotates at high speed for a predetermined time to spin-dry the laundry.

When the drying operation is performed after the laundry is completely spin-dried, the drum 12 is slowly rotated by the operation of the motor 13 so that the laundry falls inside the drum 12. When the blowing fan 41 operates in this state, the air inside the tub 11 is sucked toward the blowing fan 41 through the condensation duct 43 and then returned to the tub 11 through the drying duct 42. Repeat the cycle of discharge to the inside. At this time, air from the drying duct 42 is introduced into the drum 12 while being heated by the second heater 44, and laundry inside the drum 12 is heated and dried by the hot air. Wet steam generated in the drying process flows into the condensation duct 43 and flows toward the blowing fan 41, where moisture is condensed and removed through a condensing device inside the condensation duct 43.

Electronic devices according to various embodiments disclosed in this document may be devices of various types. The electronic device may include, for example, a display device, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. An electronic device according to an embodiment of the present document is not limited to the aforementioned devices.

Various embodiments of this document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. For example, a component expressed in the singular number should be understood as a concept including a plurality of components unless the context clearly means only the singular number. It should be understood that the term 'and/or' as used herein encompasses any and all possible combinations of one or more of the listed items. Terms such as 'include,' 'have,' and 'consist of' used in this disclosure are only intended to designate that the features, components, parts, or combinations thereof described in this disclosure exist, and the use of these terms is not intended to exclude the possibility of the presence or addition of one or more other features, components, parts or combinations thereof. In this document, "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "A Each of the phrases such as "at least one of , B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof. Terms such as "first", "second", or "first" or "secondary" may simply be used to distinguish a given component from other corresponding components, and may be used to refer to a given component in another aspect (eg, importance or order) is not limited.

The terms "~unit" or "~module" used in various embodiments of this document may include a unit implemented as hardware, software, or firmware, and may include, for example, logic, logic blocks, components, or circuits. The same terms can be used interchangeably. "~unit" or "~module" may be an integrally constituted component or a minimum unit or part of the component that performs one or more functions. For example, according to one embodiment, “~ unit” or “~ module” may be implemented in the form of an application-specific integrated circuit (ASIC).

The term “if” used in various embodiments of this document means “when” or “when” or “in response to determining” or “in response to detecting” depending on the context. can be interpreted as Similarly, “if it is determined” or “if it is detected” means “upon determining” or “in response to determining” or “upon detecting” or “in response to detecting”, depending on the context. can be interpreted as

Programs executed by the washing machine 100 described in this document may be implemented as hardware components, software components, and/or a combination of hardware components and software components. A program can be executed by any system capable of executing computer readable instructions.

Software may include a computer program, code, instructions, or a combination of one or more of the foregoing, which configures a processing device to operate as desired or processes independently or collectively. You can command the device. Software may be implemented as a computer program including instructions stored in computer-readable storage media. Computer-readable storage media include, for example, magnetic storage media (eg, ROM (Read-Only Memory), RAM (Random-Access Memory), floppy disk, hard disk, etc.) and optical reading media (eg, CD-ROM) (CD-ROM) and DVD (Digital Versatile Disc). Computer-readable storage media may be distributed among networked computer systems so that computer-readable codes may be stored and executed in a distributed manner. The computer program may be distributed (eg downloaded or uploaded) online, via an application store (eg Play Store™) or directly between two user devices (eg smart phones). In the case of online distribution, at least part of the computer program product may be temporarily stored or temporarily created in a device-readable storage medium such as a manufacturer's server, an application store server, or a relay server's memory.

According to various embodiments, each component (eg, module or program) of the above-described components may include a single object or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. there is. According to various embodiments, one or more components or operations among the aforementioned corresponding components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (eg modules or programs) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by a corresponding component of the plurality of components prior to the integration. . According to various embodiments, the actions performed by a module, program, or other component are executed sequentially, in parallel, iteratively, or heuristically, or one or more of the actions are executed in a different order, or omitted. or one or more other actions may be added.

Claims

In the washing machine,

a first heater for heating wash water;

a second heater for heating air;

a blowing fan for supplying the air into the drum;

memory for storing one or more programs; and

and a controller electrically connected to the first heater, the second heater, the blowing fan, and the memory, and executing one or more commands of a program stored in the memory, wherein the controller includes a washing cycle, a first rinse cycle, A second rinsing process, a dehydration process, and a drying process are sequentially performed;

The second rinsing cycle includes heating the wash water through the first heater and rotating the drum;

The dehydration step may include an operation of heating the air through the second heater in at least a part of the section based on the rotational speed of the drum, and an operation of supplying the heated air into the drum using the blowing fan. Including, washing machine.
According to claim 1,

The controller,

In the second rinsing cycle, rotating the drum at a first RPM or less;

Rotating the drum at a second RPM or less in at least a portion of the dewatering cycle;

The first RPM is set to a value smaller than the second RPM.
According to claim 2,

At least part of the section in which the second heater is operated,

The washing machine is identified as a section in which the rotational speed of the drum is equal to or less than the second RPM.
The washing machine according to claim 2, wherein the first RPM is set in the range of 0 to 200 RPM, and the second RPM is set in the range of 10 to 400 RPM.
According to claim 1,

The controller,

The washing machine according to claim 1 , wherein the blower fan is operated in all sections during the spin-drying step, and the second heater is operated in a section where the rotational speed of the drum is equal to or less than 2 RPM during the section where the spin-drying step is performed.
According to claim 1,

The period in which the second rinsing process is performed includes a first period in which the first heater is operated and a second period in which the first heater and the second heater are operated,

The first section and the second section are identified based on the temperature of the laundry or the inside of the drum.
According to claim 6,

The controller,

The target temperature of the laundry or the inside of the drum detected at the end of the first period is compared, and when it is determined that the temperature of the laundry or the inside of the drum is lower than the target temperature, the temperature of the laundry or the inside of the drum is lower than the target temperature during at least part of the second period. The washing machine which operates 2 heaters.
According to claim 1,

The spin-drying step includes N spin-drying operations (N is a natural number equal to or greater than 2) and fabric unwinding;

The controller,

The fabric unwinding operation is performed between the N-1 th dehydration operation and the N th dehydration operation,

The washing machine of claim 1 , wherein the fabric unwinding operation includes rotating the drum at a second RPM or less and supplying air heated by the second heater into the drum.
According to claim 1,

The dehydration process includes N dehydration operations (N is a natural number of 2 or more),

The controller,

At least one of maximum RPM and execution time is further increased as the order of the spin-drying operation increases.
According to claim 1,

The second rinsing cycle is performed for a preset time or until the temperature inside the laundry or drum reaches a target temperature.
According to claim 1,

The first heater and the second heater are disposed on an inner circumferential surface of the tub so as to face each other.
According to claim 1,

The first heater is disposed on the lower inner circumferential surface of the tub, and the second heater is disposed on the upper inner circumferential surface of the tub.
According to claim 1,

The second heater is disposed adjacent to the blowing fan.
According to claim 1,

The wash water supplied into the tub in the second rinsing process is supplied in a smaller amount than the amount of wash water supplied in the first rinsing process.
A control method of a washing machine comprising: a first heater for heating wash water, a second heater for heating air, and a blowing fan for supplying the air into a drum;

receiving a washing course including a washing cycle, a first rinsing cycle, a second rinsing cycle, a spin cycle, and a drying cycle;

controlling the washing process, the first rinsing process, the second rinsing process, the spin-drying process, and the drying process to be sequentially performed based on the received washing course;

including,

The second rinsing cycle includes heating the wash water through the first heater and rotating the drum;

The dehydration step may include an operation of heating the air through the second heater in at least a part of the section based on the rotational speed of the drum, and an operation of supplying the heated air into the drum using the blowing fan. Including, how.