KR20200042819A - laundry apparatus and a control method of the same - Google Patents

Abstract

The present invention relates to a laundry device, and more particularly, to a laundry device for heating a drum by an induction heater and a control method thereof. According to one embodiment of the present invention, the control method of the laundry device having a tub, a drum, and an induction module mounted on the tub to heat the drum by an induction heater comprises: a water supply step of supplying washing water into the tub through a water supply valve; and a heating step of heating by driving the induction module after completing the water supply step. In the heating step, the driving of the drum and the driving of the induction module are controlled to interlock each other, a section in which the drum is driven includes a section in which the induction module is driven, and the driving of the induction module is excluded in sections other than the section in which the drum is driven.

Description

Laundry apparatus and a control method of the same}

The present invention relates to a washing device, and more particularly, to a washing device for heating the drum by an induction heater and a control method thereof.

The washing device includes a tub (outer tub) for storing washing water and a drum (inner tub) rotatably provided in the tub. A laundry (cloth) is provided inside the drum, and the cloth is washed by detergent and wash water as the drum rotates.

In order to promote the activation of detergent and decomposition of contaminants to enhance the washing effect, hot washing water is supplied into the tub or heated inside the tub. To this end, the lower portion inside the tub is recessed downward to form a heater mounting portion, and a heater is generally provided in the heater mounting portion. Such a heater is a sheath heater.

When washing with cold water, the heater is not driven. However, in normal washing, the temperature of the washing water is set to 40 degrees Celsius or more, so in many cases the heater is driven during washing.

The amount of washing water required for washing may be determined by the amount of washing water required for the heater protection level and the amount of washing water required for lamination.

First, approximately 6 liters of wash water must be supplied for the heater protection level to completely immerse the heater. In the absence of fabric, when approximately 6 liters of wash water is supplied to the tub, the heater is completely immersed in the wash water and the lower part of the drum is also immersed in the wash water.

Second, in addition to protecting the heater, washing water is needed more for stacking. In general, the amount of water that the fabric contains by supplying water is about 200% of the volume. Therefore, the larger the amount, the larger the amount of washing water for lapping. Approximately, about 6 liters of washing water is required for stacking for a 3 kg bag.

For washing, the stacking is performed as the water supply starts, and after the water supply ends, the full stack is performed, and then the stacking is finished. And the water supply can be continued to achieve the heater protection level even during stacking. The watering during the stacking can be called an additional watering to distinguish it from the watering before the full stacking. It can be said that the amount of washing water to reach the heater protection level when the fabric is completely wetted is approximately 6 liters.

Therefore, approximately 12 liters of wash water are required to wash 3 kg of laundry. Of course, the washing water at this time is the amount of washing water required for one washing operation. The amount of washing water that is drained after washing and used for rinsing is separate.

In order to enhance the washing effect, a washing apparatus with a washing water circulation system is provided. The circulation system is a system that extracts washing water from the inside of the tub through a circulation pump and then sprays it back into the drum. Accordingly, the circulation system may include a flow path and a spray nozzle forming a circulation path in addition to the circulation pump. Through this circulation system, the washing water in which the detergent is dissolved is sprayed onto the fabric inside the drum to further improve the washing effect.

However, in the washing apparatus with the circulation system, more washing water may be required for the circulation of the washing water. This is because washing water is present on the circulation path from the outside of the tub to the inside of the drum. Therefore, the amount of washing water on the circulation path is further supplied with the washing water so that the heater protection level is set.

Approximately 1.5 liters of wash water is additionally required for washing water circulation. Therefore, in order to wash a 3 kg bag, 12 to 13.5 liters or more of wash water is required. When the water level of the washing water is sensed using the frequency, the water level frequency at the heater protection water level is approximately 24.7 KHz or less. The higher the water level frequency, the lower the water level.

FIG. 1 shows the relationship between the washing step in the washing machine with the washing water heater and the circulation pump and the running rate of the drum. In this washing device, the driving of the drum and the driving of the circulation pump can be synchronized. Therefore, the actual running rate of the motor and the running rate of the circulation pump may be the same.

In the initial stage of washing, watering and stacking are performed, and at this time, the drum may be tumbling. It is tumbling through normal and reverse rotation, and the drum RPM when tumbling is approximately 40 RPM. After the initial watering, if the washing water of approximately 1.5 liters or more is watered, tumbling is started and watering is continued and watering is continued.

Since the drum is tumbling driven, the fabric is lifted inside the drum and then stirred repeatedly. Therefore, the enemy is promoted. In addition, the circulation of wash water may be performed in the process of lapping to further accelerate the lamination. In addition, water supply and lapping are performed until the level of the washing water is no longer changed from the heater protection level. That is, the fabrication may be completed and terminated until the fabric is completely wet and no longer absorbs the washing water.

When watering and stacking are completed, the washing water heater is driven to heat the washing water. When heating the washing water, the motor running rate is designed to be minimal. It is designed to have a running rate of approximately 13%. That is, the time at which the motor is driven with respect to the entire time of the heating section may be designed to be approximately 13%. Minimum tumbling is required to evenly heat the fabric and wash water.

As the drum rotates, part of the wash water rotates with the drum. That is, scattering of washing water may occur, and the surface of the water may fluctuate and the heater may be exposed to the air. The heater protection level is not maintained by exposure of the heater to the air. For this reason, tumbling is required when heating, but the operating rate is set to a minimum in order to protect the heater protection level. As a result, the running rate in the heating section is relatively very low compared to the water supply stacking section or the main washing section.

Since the time at which the tumbling is performed in the heating section is minimized, the washing effect in the heating section is not large. That is, there is a problem that the washing time is increased by the time required for heating and the heating time cannot be used to secure washing performance.

In addition, the driving of the circulation pump is stopped in the heating section. That is, it is not synchronized with the driving of the drum, and the operating rate of the circulation pump in the heating section can be said to be 0%. This is because when the circulation pump is driven, washing water of about 1.5 liters or more must be additionally supplied as described above. In addition, it is because there is a possibility that the heater protection water level may be destroyed by driving the circulating pump and driving the tumbling.

On the other hand, it is not preferable to additionally supply water to drive the circulation pump or increase the running rate in the heating section. This is because the concentration of detergent decreases when the amount of washing water supplied is increased as compared to a certain amount of detergent. That is, in the relatively short section of the heating section, the washing performance may slightly increase through circulation and high running rate, but since the concentration of the detergent is low, the washing performance in the washing section may be significantly reduced.

When the washing water is heated up to the target temperature, the drum is driven with a running rate of approximately 70%, and full-scale washing is performed. In this washing, a circulation pump can be driven.

Therefore, in a general washing apparatus, a relatively large amount of washing water was inevitable to satisfy the heater protection level. Therefore, there is a problem in that washing with high concentration of detergent water (washing water in which detergent is dissolved) is difficult, or a large amount of detergent is required. In addition, in order to satisfy the heater protection level, there is no choice but to limit the degree of freedom of the running rate of the drum or circulation pump in the heating section. Therefore, there is a problem that the washing time is forced to increase relatively.

Therefore, it can be said that the requirements for reducing washing water, reducing detergent, washing with high-concentration detergent water, reducing heating time, saving energy by improving the freedom rate of the motor and circulation pump, and reducing washing time are very large.

The present invention basically aims to solve the problem of the conventional washing machine.

Through an embodiment of the present invention, despite the small amount of washing water to be supplied, it is intended to provide a washing apparatus and a control method therefor to increase the efficiency of stacking by driving a circulation pump in a stacking section.

Through one embodiment of the present invention, to provide a washing apparatus and a control method thereof, which can shorten the time required for stacking despite effectively stacking.

Through an embodiment of the present invention, by washing the heater protection water level to increase the running rate of the drum driven in the washing water heating section and the running rate of the circulation pump to improve washing performance and reduce energy consumption, a washing device and a control method thereof Want to provide.

Through an embodiment of the present invention, it is intended to provide a washing apparatus and a control method thereof that can improve washing performance by driving a circulation pump in a washing water heating section.

Through an embodiment of the present invention, it is intended to provide a washing apparatus and a control method for reducing the energy required for washing water heating to secure washing performance and reduce energy.

Through one embodiment of the present invention, to provide a washing apparatus and a control method thereof that can be washed using a high concentration of detergent water using a small amount of washing water.

Through one embodiment of the present invention, it is intended to provide a washing apparatus and a control method thereof that can safely heat the washing water despite the destruction of the heater protection water level.

Through one embodiment of the present invention, to provide a washing apparatus and a control method for heating the drum through the induction module and heating the washing water through the heated drum.

Through one embodiment of the present invention, to prevent overheating by the induction module and to provide a safe laundry device and a control method thereof. In addition, by increasing the time (induction rate of the induction module) during which the induction module is driven in the heating section, it is intended to provide a washing apparatus and a control method for improving the heating and washing efficiency.

Through an embodiment of the present invention, the driving of the drum and the driving of the induction module are controlled to interlock with each other, and in particular, a washing apparatus and a control method of the drum can prevent overheating of the drum by the induction module by interlocking with the driving of the circulation pump. Want to provide

Through an embodiment of the present invention, to provide a safe washing apparatus and a control method thereof by forcibly stopping the driving of the induction module when the drum is overheated through a drying temperature sensor that detects overheating of the drum. In particular, it is intended to provide a washing apparatus and a control method of the drum overheating that can be quickly eliminated by maintaining the driving of a predetermined drum and / or a circulation pump when the induction module is forcedly stopped.

Through an embodiment of the present invention, through a drying temperature sensor having a different installation position, different sensing targets and different sensing points, and a washing water temperature sensor sensing the temperature of the washing water, overheating by the induction module is prevented. To provide a safe laundry device and its control method.

In order to achieve the above object, according to an embodiment of the present invention, in a control method of a washing machine having a tub, a drum and an induction module mounted on the tub to heat the drum by induction, through the water supply valve A water supply step of supplying washing water into the tub; And after the end of the water supply step, includes a heating step of driving and heating the induction module, in the heating step, the driving of the drum and the driving of the induction module are controlled to be interlocked, and the section in which the drum is driven is the A control method of the washing machine may be provided, including a section in which the induction module is driven, and driving of the induction module is excluded outside the section in which the drum is driven. Therefore, the induction module can be driven with the rotation of the drum to prevent overheating of the drum.

The driving of the drum may include tumbling driving. Further, the driving of the drum may include a filtration driving.

The on / off timing of the motor for driving the drum and the on / off timing of the induction module may be the same.

In the heating step, the on timing of the induction module may be later than the on timing of the motor.

The induction module may be accelerated after the motor is turned on and turned on when the rotation RPM of the drum is equal to or higher than a predetermined RPM lower than the tumbling RPM (target RPM). This is because if the rotational speed is too low, heat from the heated drum may not be sufficiently transferred to the washing water or the fabric.

The off time of the motor and the off time of the induction module may be the same. After the motor is turned off, the drum is decelerated and stopped by inertia.

The induction module off time may be later than the motor off time and may exceed the drum stop time.

The induction module may be turned off when the RPM of the drum is lowered than the tumbling RPM (target RPM) or lower than the tumbling RPM (target RPM) after the motor is turned off. Therefore, the induction module may be driven even after the motor is turned off. Therefore, the heating time can be increased.

The washing device may further include a drying temperature sensor that senses the temperature of the drum.

The induction module may be driven off when the abnormality of a set temperature is detected by the drying temperature sensor before being turned off in conjunction with driving of the drum. That is, the off condition during the operation of the induction module may be referred to as the interlocking condition with the drum and the temperature condition by the drying temperature sensor. If only one condition is satisfied, the induction module will be turned off.

The driving of the drum may be repeated multiple times in the heating step.

The washing device may further include a wash water temperature sensor that senses the temperature of the wash water in the tub, and the wash water temperature sensor may be provided to sense the temperature of the wash water when the drum is stopped.

Therefore, the temperature of the wash water is sensed multiple times in the heating step. In addition, the temperature of the drum is sensed multiple times during driving of the drum.

The heating step is preferably terminated when the washing water temperature sensor detects a preset temperature.

The washing device may include a circulation pump that pumps the washing water inside the tub and supplies it to the upper portion of the drum.

In the heating step, it is preferable that the driving of the drum and the driving of the circulation pump are interlocked. Washing water can also be heated by driving the circulation pump. In particular, even when the water level of the washing water is lower than the lowermost part of the drum, the washing water can be heated.

The on / off timing of the motor for driving the drum and the on / off timing of the circulation pump may be the same.

The heating step may be performed in a state in which the level of the washing water is lower than the lowermost part of the drum.

In the heating step, the washing water level is preferably equal to or smaller than the circulating water level formed by washing water equal to or less than the amount of washing water filled in the circulation path for driving the circulation pump.

The amount of wash water stored in the tub in the heating step to form the circulating water level may be 1 liter or less.

In the heating step, the driving of the drum may include tumbling driving and filtration driving.

In the heating step, the driving of the drum may include a cyclic driving in which filtration driving is continuously performed in the tumbling driving.

In the heating step, tumbling driving, stopping, and circulating driving of the drum may be repeatedly performed.

In order to achieve the above object, according to an embodiment of the present invention, the tub for receiving the washing water; A drum rotatably provided inside the tub and accommodating a gun therein; A motor driving the drum; An induction module mounted on the tub to heat the drum through induction heating; A water supply valve provided to supply washing water into the tub; A water level sensor that senses the level of washing water in the tub; And includes a control unit for controlling the driving of the motor, the induction module and the water supply valve, and the control unit controls the on / off of the motor and the on / off of the induction module to interlock, and after the motor is turned on, the drum When the RPM of the target RPM is greater than a predetermined RPM before reaching the target RPM, a washing device may be provided, characterized in that the induction module is controlled to be driven.

The control unit may control the induction module to be turned off when the drum is below a predetermined RMP before the drum stops after the motor is turned off or after the motor is turned off.

Further comprising a drying temperature sensor for sensing the temperature of the drum, when the temperature detected by the drying temperature sensor is above a predetermined temperature, the control unit excludes the interlocking control of the motor and the induction module, forcibly induction module A washing device characterized in that it is turned off may be provided.

If the time required for the motor to turn off after starting is preset, and if the induction module is forcibly turned off before the predetermined time elapses, the control unit controls the motor to be turned off after the predetermined time elapses. You can.

A washing device may be provided, further comprising a circulation pump that pumps the washing water inside the tub into the drum, and the control unit controls the operation of the motor and the operation of the circulation pump to be interlocked. .

Features of the above-described embodiments may be implemented in combination in other embodiments unless contradictory or exclusive to each other.

Through an embodiment of the present invention, it is possible to provide a washing apparatus and a control method for improving the stacking efficiency by driving a circulation pump in a stacking section, even though the amount of washing water to be supplied is small.

Through an embodiment of the present invention, it is possible to provide a washing apparatus and a control method thereof, which can shorten the time required for the stacking, despite effectively stacking.

Through one embodiment of the present invention, it is possible to provide a washing apparatus and a control method for improving washing performance and reducing energy consumption by increasing the running rate at which the drum is driven in the washing water heating section by breaking the heater protection water level.

Through one embodiment of the present invention, it is possible to provide a washing apparatus and a control method thereof that can improve washing performance by driving a circulation pump in a washing water heating section.

Through an embodiment of the present invention, it is possible to provide a washing apparatus and a control method for reducing the energy and time required for heating the washing water to secure washing performance and reduce energy.

Through an embodiment of the present invention, it is possible to provide a washing apparatus capable of washing using high concentration detergent water using a small amount of washing water and a control method thereof.

Through one embodiment of the present invention, it is possible to provide a washing apparatus and a control method thereof that can safely heat the washing water despite the destruction of the heater protection water level.

Through one embodiment of the present invention, it is possible to provide a washing apparatus capable of heating a drum through an induction module and heating washing water through a heated drum, and a control method therefor.

Through one embodiment of the present invention, the heating section of the induction module and the heating section of the circulation pump are substantially the same, and a laundry apparatus and a control method thereof can be prevented from being damaged due to overheating of the fabric.

Through one embodiment of the present invention, the heating section of the induction module is substantially the same as the rotation section of the drum or included in the rotation section of the drum, thereby effectively preventing overheating of the drum and providing a safe washing device and a control method thereof can do. In addition, it is possible to provide a washing apparatus and a control method thereof that can prevent overheating of the drum in advance through a drying temperature sensor capable of sensing the temperature of the drum.

Through one embodiment of the present invention, it is possible to prevent overheating by the induction module and provide a safe laundry device and a control method thereof. In addition, the time during which the induction module is driven in the heating section (activation rate of the induction module) can be increased to provide a washing apparatus and a control method thereof that can improve heating and washing efficiency.

Through an embodiment of the present invention, the driving of the drum and the driving of the induction module are controlled to interlock with each other, and in particular, a washing apparatus and a control method of the drum can prevent overheating of the drum by the induction module by interlocking with the driving of the circulation pump. Can provide

Through one embodiment of the present invention, the drying of the drum through the drying temperature sensor for sensing the overheating of the drum forcibly stops the driving of the induction module to provide a safe laundry device and a control method thereof. In particular, when the induction module is forcedly stopped, it is possible to provide a washing apparatus and a control method thereof that can quickly eliminate drum overheating by maintaining the driving of a predetermined drum and / or a circulation pump.

Through an embodiment of the present invention, through a drying temperature sensor having a different installation position, different sensing targets and different sensing points, and a washing water temperature sensor sensing the temperature of the washing water, overheating by the induction module is prevented. Therefore, it is possible to provide a safe laundry device and a control method thereof.

Figure 1 shows the operation of the drum driving and circulation pump driving in the washing process in the conventional washing machine,
Figure 2 shows a control configuration of a washing machine according to an embodiment of the present invention,
Figure 3 shows the operation of the control configuration in the water supply step and the stacking step in the washing machine according to an embodiment of the present invention,
Figure 4 shows a control flow of the washing machine according to an embodiment of the present invention,
Figure 5 shows the operating state of the control configuration in the heating step in the washing machine according to an embodiment of the present invention,
Figure 6 shows the state when the drum is stopped,
7 shows a state when the tumbling drive of the drum,
8 shows a state when driving the filtration of the drum,
9 shows a relation between the drum driving and the driving of the induction module for safe driving of the induction module,
Figure 10 shows the correlation between the washing performance, water volume, washing temperature, washing water circulation and drum driving in a conventional washing machine,
11 is a diagram illustrating a correlation between washing performance, water volume, washing temperature, washing water circulation, and drum driving in a washing machine according to an embodiment of the present invention.

Hereinafter, a washing apparatus and a control method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The applicant has filed a patent application (Korean Patent Application No. KR10-2017-0101332, hereinafter referred to as "prior patent") for a washing machine having an induction module as a washing machine applicable to one embodiment of the present invention. .

Accordingly, matters not described in this specification may be the same or similar to those disclosed in the preceding patent unless contradicted by the preceding patent.

Therefore, a detailed description of the cabinet forming the exterior of the washing machine, the tub provided inside the cabinet, the drum provided rotatably inside the tub, and the door provided rotatably in the cabinet will be omitted. In addition, detailed description of the heating principle and structural characteristics of the induction module is omitted.

First, with reference to Figure 2 will be described in detail with respect to the control configuration of the washing machine according to an embodiment of the present invention.

The control unit 20 is provided as a main processor to control the operation of the washing machine. Through such a control unit, operation of various control configurations described below can be controlled.

The motor 21 is provided to drive the drum. That is, the motor 21 is provided to rotate the drum. The rotational force of the motor 21 can be transmitted directly to the drum or indirectly. Recently, a direct-connected motor in which the rotational force of the motor 21 is directly transmitted to the drum is generally used.

The driving pattern of the drum may vary according to the driving pattern of the motor 21. Therefore, the control unit 20 controls the driving of the motor 21 to generate various driving such as tumbling driving of the drum, filtration driving, and spin driving. The motion of the drum can also be called the motion of the drum.

The actual driving time within a certain time period may be referred to as a running rate. That is, when the motor is actually driven for only 50 seconds within a 100 second section, the motor running rate may be 50%. Since the motor drives the drum, it can be said that the effective rate of the motor is approximately equal to the effective rate of the drum. In this embodiment, it can be understood that the same is true unless the actual running rate of the motor and the running rate of the drum are otherwise described.

The tumbling drive of the drum is a drive that causes the inside of the drum to lift and fall as the drum rotates at approximately 40 to 46 RPM. It can be said that washing or lapping is performed by mechanical force through the fall of the fabric and friction with the drum. Since the gun is a drive that is stirred in the drum, it can be said to be a drive that is commonly used.

The filtration driving of the drum can be said to be a driving in which the drum and the gun rotate integrally as the drum is in close contact with the inner peripheral surface of the drum as the drum rotates at approximately 100 RPM. At this time, the laundry cloth is unfolded on the inner circumferential surface of the drum, and separation of wash water from the cloth occurs.

The spin drive of the drum may be referred to as a drive for centrifugal dehydration of washing water in the fabric as the drum rotates at about 800 RPM or more. Spin washing is performed in the final washing process by a very large centrifugal force, so that all washing can be completed.

Therefore, the rotation RPM of the drum increases in the order of spin driving, filtration driving, and tumbling driving. The spin drive may be referred to as a drive that continuously rotates the drum in one direction, and the tumbling drive and spin drive may be referred to as a drive that repeatedly rotates and stops in the forward and reverse directions.

For washing, washing water must be supplied from the outside of the washing machine to the inside of the tub. To this end, the washing device is provided with a water supply valve 23. The water supply valve is connected to an external water supply source, and when the water supply valve is operated, wash water is supplied into the washing machine.

If necessary, a plurality of water supply valves 23 may be provided. A cold water valve 25 for supplying cold water from an external water supply source and a pre-valve 24 for supplying water other than cold water, such as hot water, may be provided in connection with a boiler.

When the temperature of the washing water is set to room temperature (cold water or cold water) during washing, heating of the washing water is not required. Therefore, in this case, the water supply can be performed only by the cold water valve 25. However, when the temperature of the washing water during washing is set to a constant temperature (25 degrees Celsius, 40 degrees Celsius, etc.) rather than room temperature, the washing water may be supplied through the pre-valve 24 and the cold water valve 25. Of course, in the latter case, it will be possible to supply the washing water only through the cold water valve 25.

Meanwhile, the pre-valve 24 and the cold water valve 25 may be valves for supplying the same cold water. The water supply through the pre-valve 24 may be a case where water is supplied to the tub through the inside of the drum, and the water supply through the cold water valve 25 may be the case when water is supplied through the tub without going through the drum. Of course, it could be the opposite.

In addition, the pre-valve 24 may be a water supply valve for supplying washing water to the tub through a detergent box, and the cold water valve 25 may be a water supply valve for supplying washing water directly into the tub without going through the detergent box. You can. Of course, it could be the opposite.

Therefore, a plurality of water supply valves may be provided according to the temperature of the wash water and the water supply path of the wash water.

The water level sensor 26 may be provided to sense the water level of the wash water supplied into the tub. That is, it can be said to be a sensor for controlling the water level so that an appropriate amount of washing water is supplied.

In general, the water level sensor 26 is often used a frequency sensor for sensing the water level through the frequency. The sensed water level is sensed by using a different frequency sensed according to the water level. When washing, the water level sensor 26 senses the water level so that the water supply is performed between the air level and the maximum level. As described above, the maximum water level is a heater protection level, which may be referred to as a level at which a lower portion of the drum is immersed in washing water. It is common for the water supply to be carried out until the water level of the washing water after the cloth has absorbed the washing water is the heater protection level.

In this embodiment, it can be said that the heater protection water level is destroyed. That is, the heater protection level can be neglected. Therefore, the maximum water level at which the water supply is performed may be referred to as the water supply level, not the heater protection level. The water supply level in this embodiment may be referred to as a water level at which a lower portion of the drum is immersed in washing water.

In the frequency sensor, the air level is approximately 25.5 Khz, and the heater protection level is approximately 24.7 Khz. Of course, the value of a specific frequency may vary depending on the size of the washing machine, the model of the frequency sensor, and the external environment. However, the higher the frequency, the lower the water level in the frequency sensor will be the same.

The control unit 20 controls the operation of the water supply valve 23 based on the water level value detected by the water level sensor 26.

The induction module (IH module, 27) may be referred to as a heater that heats the drum by induction. Since the induction module has been described in detail in the prior patent, a duplicate description is omitted.

When the drum is heated by the induction module, the washing water is heated. Of course, the fabric contacting the drum as well as the washing water is directly heated. It is possible to increase the heating effect by directly heating the fabric absorbing the washing water by this heating method. In addition, since the diffusion of heat to the surroundings is reduced, the heating efficiency becomes higher.

When washing, heating through the induction module may be performed through the wash water temperature sensor 28. That is, when the temperature of the washing water reaches the set temperature, heating may be ended.

With the induction module, the drum can be heated to about 160 degrees Celsius in a short time. For example, in about 3 seconds, the temperature of the outer circumferential surface of the drum may increase to 160 degrees Celsius. Therefore, the heat in the drum should be transferred to the wash water and the fabric to prevent overheating of the drum or overheating of the induction module.

A drying temperature sensor 29 may be provided to prevent overheating of the drum. The drying temperature sensor 29 may be provided to directly or indirectly sense the temperature of the drum outer peripheral surface. When it is determined that the drum is overheated through the drying temperature sensor 29, the control unit 20 stops the operation of the induction module.

The wash water temperature sensor 28 is mounted on the lower portion of the tub to sense the temperature of the wash water. The drying temperature sensor is mounted on the top of the tub to sense the temperature of the outer peripheral surface of the drum. Therefore, it is preferable that the installation position and the sensing object of both are different.

The wash water temperature sensor 28 may directly sense the temperature of the wash water. The drying temperature sensor 29 may indirectly sense the temperature of the drum by non-contacting the rotating drum. Therefore, it is preferable that both sensing mechanisms or methods are different.

The wash water temperature sensor 28 may be provided to sense the temperature of the wash water when the drum is stopped. The induction module may be controlled to not operate when a target temperature is reached. The drying temperature sensor 29 may be provided to sense the temperature of the drum when the drum rotates. In particular, it may be provided to sense the temperature during the rotation of the drum and the operation of the induction module. Therefore, it is preferable that both sensing points are different.

Through this dual sensor configuration, a safe laundry device and a control method thereof can be provided.

An embodiment of the present invention can provide a washing apparatus capable of stably driving the induction module and a control method thereof. In particular, it is possible to make the drum drive and the induction module drive interlock. Details of these embodiments will be described later.

The washing apparatus and control method according to the present embodiment can perform effective washing with a significantly smaller amount of washing water than the amount of washing water required for washing than the conventional one. That is, effective washing can be performed only with the amount of washing water up to a level much lower than the heater protection level.

In order for washing to be carried out effectively, sufficient detergent water (washing water in which detergent is dissolved) must be supplied to the fabric. That is, it is preferable that washing is carried out in a state where the fabric can absorb and discharge detergent water at the same time. It will be apparent that if a portion of the fabric is not wet, this portion will not be washed. For this reason, it can be said that washing has been performed on the heater protection level in the related art.

However, in this embodiment, the heater protection level is not required, and washing may be performed at a level much lower than the heater protection level. That is, washing may be performed while the fabric is not immersed in the washing water.

In this case, as the drum is driven, the detergent water absorbed by the fabric is forced to be discharged into the tub and the washing effect is inevitably lowered. For this reason, in this embodiment, it is preferable that the circulation pump 22 for supplying or resupplying detergent water to the fabric is provided.

The circulation pump 22 may be referred to as a configuration in which a portion of the washing water is extracted from the lower portion of the tub and then pumped to spray the washing water from the drum. The washing effect can be enhanced by the injection pressure of the washing water, and the washing water (detergent water) is re-supplied to the fabric so that the fabric is always sufficiently wet. Therefore, effective washing can be performed even if the fabric is not immersed in the washing water.

Washing through the washing device may be performed through initial water supply, lapping, heating, and the main washing step or section. After this washing, rinsing and dehydration may be performed to end the washing. The entire washing process or the washing course is automatically performed in the order of washing, rinsing and dehydrating, and ends.

Additional watering can be performed at the stacking stage. This embodiment may achieve the above-described object, particularly when heating is performed in the washing process. Features in the washing stroke according to an embodiment of the present invention described below may be equally applied to the rinsing stroke unless contradictory or exclusive.

Hereinafter, a control method according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 to 4. FIG. 4 shows the entire flow of the washing process, and FIG. 3 shows the control configuration (water supply valve, motor driving the drum, circulation pump and water level sensor), especially in the water supply and lapping section (step) within the washing process. It shows how they work.

First, the water supply and stacking section will be described.

When the washing is started, the drum may be driven while the amount detection (S10) may be performed. The greater the detected amount of fabric, the larger the amount of washing water may be required, and the washing time may be longer. When the fabric amount is detected, an expected end time of washing may be displayed according to the detected fabric amount.

When the amount of cloth is detected, the water supply step (S20) may be performed. The water supply step (S20) may be referred to as initial water supply. In the water supply step (S20), the drum may be tumbling, and the RPM at this time may be approximately 46 RPM. When the motor is turned on, the RPM gradually increases and operates while maintaining the set RPM of 46 RPM, and when the motor is turned off, the drum gradually stops at 46 RPM and stops. Therefore, the drum rotates for a short time after the motor is turned off. After the motor is turned off and the drum rotation is stopped, the motor is turned on again after a predetermined time has elapsed. At this time, the drum can be rotated in the opposite direction.

In the water supply step (S20), the water supply valve 23 may be intermittent water supply that repeats on / off, and may be supplied by maintaining the temperature for a certain period of time. In the water supply step (S20), the water supply may be performed multiple times. The on / off pattern or the on time of the water supply valve 23 in each water supply turn may be different. In FIG. 2, an example in which tumbling driving 4 times and water supply rounding 4 is performed is illustrated. The number of tumbling driving and the number of water supply rounds may vary depending on the amount of cloth.

In the water supply step S20, the water supply S21 by the pre-valve 24 and the water supply S22 by the cold water valve 25 may be sequentially performed. That is, the free water supply S21, the cold water supply S22, the free water supply S23, and the cold water supply S24 may be performed. The final water supply in the water supply step (S20) may be cold water supply (S24).

As the water supply step (S20) progresses, the water level increases. That is, the sensed water level frequency is reduced. 25.5 Khz in FIG. 2 is an example of the water level, 25.4 Khz is a water level higher than the air level, and the minimum water level required in this embodiment (for example, the water level around 1 liter before and after, in this embodiment it is referred to as a circulating water level) And 24.7 Khz is an example of a conventional heater protection level or a lower level of the drum immersed in some washing water.

In the initial water supply step (S20), the tumbling driving section and the water supply section may be performed to overlap a large portion. In other words, it is possible to reduce the time of lamination afterwards by supplying detergent water directly to the fabric.

It takes some time for the dry fabric to absorb the wash water. Therefore, the amount initially absorbed by the cloth among the wash water supplied in the water supply step (S20) is relatively small. Therefore, when reaching the target water level, the water supply step (S20) is terminated. The target water level at this time may be similar to or lower than the conventional heater protection water level. Of course, the target water level can be said to be higher than the circulating water level. However, since the water level is expected to be lowered through lamination, it is possible to set the target water level to be the same as the heater protection level. Although not shown in FIG. 3, the water level may be sensed in the water supply process, and this may be done to determine the end point of the water supply process.

When the water supply step S20 ends at the target water level (approximately 24.7 Khz), the stacking step S30 is performed. In the stacking stage, it can be said that the fabric sufficiently absorbs the washing water.

In the present embodiment, the water level at the end of the water supply step (S20) may be a water level that is not substantially submerged in the wash water. Only a portion of the fabric that is in contact with the lower portion of the drum may be at a water level immersed in wash water. And the stacking step (S30) can be started while driving the drum rather than the additional water supply. Therefore, it is preferable that the circulation pump is driven together with the drum driving for stacking.

That is, when the water supply step (S20) is finally finished with the water supply (S24), it is preferable that the stacking step (S30) is started with motor on and drum circulation for drum driving.

At the end of the water supply step (S20), the water level is higher than the circulating water level. Therefore, it can be said that a sufficient amount of washing water for circulation is stored in the tub.

The drum driving may include tumbling driving. In addition, the drum driving may include a filtration driving.

The tumbling driving is performed for a predetermined time from the motor on, and the filtration driving can be continuously performed. That is, while the drum rotates at 46 RPM for tumbling driving, the RPM can be raised and maintained at approximately 100 RPM for filtration driving. And the motor can be turned off after a predetermined time has elapsed. In such tumbling driving, driving of a drum that continuously performs filtration driving may be referred to as cyclic driving or cyclic motion of the drum for convenience. That is, the circulation driving of the drum can be said to be a driving in which filtration is continuously performed after tumbling.

As the circulation pump is driven in the initial tumbling driving of the circulation driving, the water level gradually decreases. This is because the cloth absorbs the washing water sprayed on the cloth by driving the circulation pump. As the water level gradually decreases, the amount of washing water required to drive the circulation pump may not be stored in the tub. Accordingly, in the late filtration driving of the circulating driving, a portion of the washing water that is excessively absorbed by the washing water or the fabric around the drum is dehydrated. Washing water for driving the circulation pump can be secured by the filtration operation.

Most of the washing water is absorbed into the fabric and wets the fabric by the circulation driving of the drum of the first turn and the circulation pump driving (S31). Washing water absorbed in the fabric in an appropriate amount is not dehydrated by centrifugal force because the RPM of the filtration drive is relatively low.

Accordingly, driving of the drum and the circulation pump of the first turn is performed (S31), and driving of the drum and the circulation pump is terminated by turning off the motor and the circulation pump (S32). The motor and circulation pump can be synchronized. However, when the motor is off, the drum rotates for a short time to stop. It can be said to be due to inertia. When the drum is completely stopped after the motor is turned off, the water level is measured (S33). That is, to measure the water level accurately on a calm surface. After driving the drum and circulation pump of the first round, the water level will be approximately air level.

When the sensed water level is an air level or a water level lower than the circulating water level, for example, 25.5 Khz or greater than 25.4 Khz, the first additional water supply may be performed. The additional water supply may be water supply through the water supply valve 23 described above. That is, the valve that has been on at the end of the water supply step (S20), for example, the water supply (S24) through the cold water valve (S25) may be performed again. Therefore, the additional water supply may be indicated by S34 to distinguish it from the water supply (S24) in the stacking. The additional water supply (S34) may be performed up to the circulating water level. That is, water supply may be performed until the water level sensor 26 senses 25.4 Khz as an example.

After the additional water supply (S33) is performed, driving of the second drum and the circulation pump is performed again (S31). Here, it can be seen that the water level at which the circulation pump starts to be driven is the target water level of the additional water supply in the step of stacking (S30).

The driving of the drum and the circulation pump is performed in the same manner as in the first round, and when water level sensing is required, an additional water supply (S33) may be performed again. Of course, the drive of the drum and circulation pump can be restarted.

In the stacking step (S30), the drum and circulation pump driving (S31), the motor and circulation pump off (S32), the water level sensing (S33) and the additional water supply (S34) may be continuously repeated. This repetition may be performed until the water level is sensed (S33) and the water level senses the circulating water level and no further water supply is required. That is, if the additional water supply is repeatedly performed up to the circulating water level, and the water level is no longer reduced at the circulating water level, the stacking step is terminated.

In other words, the stacking step (S30) is terminated (S35) by the water level is detected as the circulating water level after the circulation driving. That is, the stacking step (S30) is performed until the point at which the cloth no longer additionally absorbs the washing water (the point at which the absorption and discharge of the washing water is balanced from the cloth) despite the spraying of the washing water through the circulation pump. It can be said.

When the bottom of the drum contacts the washing water, approximately 2 liters of washing water is supplied to the tub, for example, 24.9 Khz. When a part of the lower portion of the drum is immersed in the washing water and a part of the fabric inside the drum is immersed in the washing water, approximately 3 to 4 liters of washing water is supplied to the tub, for example, 24.7 Khz. On the other hand, the circulation level is a state in which approximately 1 liter of wash water is supplied to the tub. That is, the circulating water level (eg 25.4 Khz) may exceed the air level (eg 25.5 Khz) and be the amount of wash water between 1 liter.

As described above, it has been described that approximately 1.5 liters of wash water is required to smoothly drive the circulation pump. However, the amount of washing water of 1.5 liters can be said to be the amount of washing water when driving the circulating pump during normal tumbling operation.

In this embodiment, when driving the circulation pump, it is more preferable that the drum performs circulation driving. Since the filtration driving is implemented in the circulation driving, it is promoted that the washing water is collected under the tub, so that the circulation pump can be smoothly driven even with a relatively small amount of washing water.

The circulating water level means that the lowermost portion of the drum is an amount of laundry that is approximately 1 liter less than the level of contact with the washing water, and approximately 2 to 3 liters less than the heater protection level. In addition, the circulating water level may be referred to as a water level when approximately 1 liter of wash water is added from the air level.

Therefore, it can be seen that a relatively small amount of washing water is stored in the tub after completion of the lapping. In other words, it can be seen that even if only a relatively small amount of washing water is supplied, it is possible to effectively perform lapping, and subsequent heating or main washing can also be performed.

In the conventional washing apparatus, the amount of washing water after the lamination to the heater protection level is inevitably required, but in this embodiment, only the amount of washing water to the circulation level after lapping may be required. That is, it can be seen that the amount of residual washing water in the tub after lapping is remarkably small in this embodiment. Rather, even if the amount of washing water (less than 1 liter) smaller than the amount of washing water (approximately 1.5 liters) filled in the circulation pump and the circulation passage remains after lapping, subsequent washing water heating and main washing can be effectively performed. Able to know.

In the case of the circulating pump driving and the tumbling driving of the drum, approximately 1.5 liters may remain, and by performing the filtration driving, approximately 1 liter may remain. In particular, it is possible to increase the antifoaming effect and to effectively drive the circulation pump by circulating driving through residual washing water of about 1 liter.

Here, it can be seen that the amount of washing water required for washing is very effective for washing effect and energy saving.

First, washing may be performed through high-concentration detergent water. When a large amount of washing water is required, the amount of detergent is inevitably increased for optimum concentration of detergent water. In many cases, washing will be carried out at a concentration lower than that required. However, in this embodiment, since the amount of washing water can be reduced by approximately 2 to 3 liters, washing is possible through very high concentration of detergent water. Due to this, of course, it is inevitable to improve the washing performance. Assuming that the washing machine is used approximately 3-4 times a week, the amount of water saved will also be substantial.

Next, it is possible to increase the heating efficiency to be described later. When heating the wash water or cloth, a lot of heat energy is consumed for heating the wash water. This is because the heat capacity of water is relatively large. Therefore, as the amount of washing water to be heated is less, effective energy saving can be performed. That is, the amount of energy required for heating to the same temperature is reduced, and it is possible to heat to a higher temperature through the same amount of energy.

For example, it is possible to heat 52 degrees Celsius by using energy that is conventionally consumed for heating 40 degrees Celsius. Therefore, when the same energy is consumed, it is possible to improve washing performance by higher temperatures.

For this reason, according to this embodiment, it can be said that it is possible to improve the chemical washing effect by detergent and high temperature. In addition, the effect of reducing the washing time and the effect of promoting washing by mechanical force may be more pronounced in the heating step described below.

As shown in FIG. 4, after the lapping step (S30), a heating step (S40) and a main washing step (S50) may be performed.

Hereinafter, the heating step S40 performed after the stacking step S30 will be described in detail with reference to FIGS. 5 to 8.

5 shows a driving state and a change in water level of the induction module of the motor and the circulation pump in the heating stage. 6 to 8 respectively show the state when the drum stops, the tumbling drive, and the filtration drive.

In this embodiment, as shown in FIGS. 6 to 8, the heater mounting portion 11 of the tub 10 may not be formed, and the heater 12 may also not be mounted. However, the conventional tub may be used without design change, and the heater 12 may also be used in addition to the heating section, so it can be said that it is illustrated. On the other hand, the heater 12 may be said to be shown to clarify that the heater protection water level in this embodiment can be destroyed or ignored.

In the stacking step (S30), the water supply is completed and the stacking is completed. That is, it may be said that no more water supply can be performed, and the fabric absorbs the washing water as much as possible.

After the stacking step (S30), a heating step (S40) may be performed to perform washing at a high temperature. In this heating step (S40), the drum is heated through the induction module (IH module, 27). Therefore, it is preferable that the induction module is always turned on while the drum is rotating.

6, it is preferable that the induction module 27 is off when the drum is stopped. It is preferable that the circulation pump is not driven. The induction module 27 may be provided on the upper portion of the tub, but the gun is not placed on the upper portion of the drum facing the induction module 27. Thus, certain parts of the drum may overheat while the drum is stopped. This is because heat cannot be transferred to the cloth or washing water. Therefore, it is preferable that the induction module 27 is always turned off when the drum is stopped.

In the heating step (S40), the drum is driven to heat the washing water and the cloth evenly. The driving of the drum may include tumbling driving and filtration driving. Further, the driving of the drum may include tumbling driving and circulating driving. Tumbling driving and circulating driving may be performed sequentially or alternately.

As shown in FIG. 7, as the drum rotates during tumbling, the gun can be dropped by gravity after being lifted by the lifter 16, and circulating water may be injected into the drum. In addition, the induction module may be driven to heat the drum.

As shown in FIG. 8, when driving the filtration or driving the filtration in a circulating drive, as the drum rotates, the cloth is in close contact with the inner peripheral surface of the drum and can rotate integrally with the drum. This is because the centrifugal force due to the rotation of the drum is greater than the gravity. At this time, circulating water may be injected into the drum, and the induction module may be driven to heat the drum.

7 and 8, there is shown a state in which washing water is circulated and sprayed from the top of the drum into the drum (18) and a state in which the induction module is driven and a variable magnetic field is provided to the drum (19). An eddy current is generated in the drum by a change in the magnetic field, and heat is generated by the eddy current.

Therefore, as shown in FIGS. 6 to 8, the heater protection water level in the entire heating section is destroyed so that the water level will always be lower than the lowermost bottom of the drum, that is, below the circulating water level.

During tumbling and circulation driving, the induction module 27 may operate and the circulation pump 22 may operate. Washing water is sprayed onto the heated fabric and drum by the operation of the circulation pump (22). Therefore, the heat of the heated drum can be effectively transferred to the washing water and the fabric. That is, drum driving, heating, and circulation pump driving are simultaneously performed.

As illustrated in FIG. 5, a section in which rotation of the drum is stopped from the start of rotation of the drum and an operation section of the circulation pump may be the same. Since the circulation pump can operate synchronously by turning on the motor, substantially the start of rotation of the drum and the start of operation of the circulation pump can be simultaneously performed. However, even if the motor is off, the drum continues to stop for a short period of time due to the inertia force. Therefore, the circulation pump can be turned off synchronously when the motor is turned off. Of course, the circulation pump may be turned off when the drum is stopped.

The section where the drum starts to rotate and stops rotating and the section where the induction module starts and turns off may be the same. However, it is preferable that the induction module is turned on after the drum starts rotating, and the induction module is turned off before the drum stops rotating.

Therefore, basically, the driving section of the drum may include or be identical to the driving section of the circulation pump and the driving section of the induction module.

When the motor is turned on, the rotational speed of the drum increases while rotating while maintaining the target speed. When the rotational speed of the drum is low, some areas of the drum may heat up rapidly. Therefore, it is preferable that the induction module is turned on only when the rotational speed of the drum after the motor is turned on is higher than a certain speed. This can prevent overheating of the drum.

Likewise, it is not desirable that the induction module is turned on until the drum is completely stopped. This is because a portion of the drum may rapidly heat up at the drum stop. Therefore, it is preferable that the induction module is turned off when the rotational speed of the drum is lower than a certain speed after the motor is turned off. It is not desirable to turn off the induction module after the motor is off. Since the drum rotates due to the inertia force, it is preferable to reduce the overall heating time by heating in some inertia rotation sections. And it is desirable to turn off the induction module only when the drum descends to a certain speed before it stops completely. Here, the drum rotation speed at which the induction module is turned on when the drum rotation is accelerated may be the same as the drum rotation speed at which the induction module is turned off when the drum rotation is decelerated. It can be about 15 RPM. That is, it can have the same critical RPM. If the critical RPM is lowered, the heating efficiency may be improved, but there is a risk of overheating. Conversely, when the critical RPM is increased, the heating efficiency is reduced, but the fear of overheating is further reduced. Therefore, it is possible to control the operation of the induction module by using an RPM corresponding to about 1/3 of the tumbling RPM as a critical RPM.

Therefore, the on / off timing of the motor and the on / off timing of the induction module may be different.

According to this embodiment, in the heating step S40, the heater protection level is meaningless as described above. As shown in FIG. 5, it can be seen that effective heating is possible even when the water level in the heating section fluctuates within the air and water levels. The illustrated water level change is an example and may vary in different aspects within the air and circulating water levels. When the heating target temperature of the wash water is less than approximately 60 degrees Celsius, the amount of water evaporated is not relatively large. This is because evaporation and condensation occur simultaneously.

According to this embodiment, the overheating prevention in the washing device is irrespective of the amount of washing water and can be implemented through driving control of the induction module. Therefore, the operating rate of the motor in the heating step (S40) can be very high. As an example, it can be increased from 80% to approximately 90%. In the conventional washing machine, the running rate in the heating section is about 13%, whereas it is very high.

It can be seen that the mechanical power capable of enhancing the washing effect can be provided by the increase in the running rate. In addition, due to the nature of the induction module, it is possible to reach the washing temperature very quickly. That is, it has the effect of improving the mechanical power, increasing the heating efficiency, saving energy and reducing the heating time.

In the heating step (S40), the drum may be tumbling and circulating. After the tumbling drive, it is temporarily stopped and a cyclic drive may be performed. This driving pattern can be repeated. That is, the heating step S40 may be performed while the driving pattern is repeated until the washing water temperature sensor senses the target temperature.

The water level in the heating step S40 will fluctuate between the air water level and the circulating water level.

When only tumbling is driven, a relatively large amount of washing water is required to drive the circulation pump as described above. In the case of driving the filtration, excessive heat is transferred to the fabric, which may cause thermal damage of the fabric. Therefore, it is not preferable to perform only tumbling driving or alternate tumbling driving and filtration driving.

In this embodiment, tumbling driving and cyclic driving may be repeated. Therefore, if the circulation pump can be driven with only a relatively small amount of washing water, it is possible to prevent overheating of the fabric and to effectively heat the fabric.

It is preferable that the tumbling time in the circulation drive is longer than the filtration time.

The longer the tumbling time, the more evenly the fabric and wash water will be heated, and it will be possible to increase the washing effect by heating. However, in this case, the washing water for circulation may be insufficient. Therefore, the filtration driving should be performed for a suitable time. As the filtration operation time increases, there is less concern about lack of washing water for circulation. However, the time for the fabric to adhere to the drum increases, and the fabric may overheat.

Therefore, the tumbling time and the filtration time distribution should be appropriate to prevent overheating of the fabric, to secure a sufficient amount of washing water for driving the circulation pump, and to improve heating and washing performance. In FIG. 5, for example, tumbling driving 26 seconds, rest period 4 seconds, and circulating driving 38 seconds are repeated. In addition, it is shown that, for example, the tumbling drive is 26 seconds and the filtration drive is 12 seconds in the circulation drive. According to this embodiment, the tumbling time is larger than the filtration time, and specifically, it is preferable that it is 2 times or more. In addition, it is preferable that the tumbling driving and the circulating driving are performed alternately.

Hereinafter, an embodiment for preventing overheating in the heating step will be described in detail with reference to FIG. 9.

When the water supply is finished, the drum may be heated by driving the induction module. The fabric contained inside the drum may be heated by a heated drum.

The induction module faces only a portion of the outer peripheral surface of the drum. Therefore, when the induction module is driven while the drum is stopped, only a specific portion of the drum can be heated. In particular, when the induction module faces the upper portion of the drum, it is difficult to perform heat transfer from the heated drum to the cloth or washing water. Therefore, in this embodiment, basically, the driving of the drum and the driving of the induction module may be interlocked. In particular, the driving section of the drum may include or be identical to the driving section of the induction module.

On the other hand, the drum accelerates when the motor is on and starts driving, and decelerates and stops when the motor is off. Therefore, the RPM at the start and end of the drive is very low. Therefore, it is preferable that the induction module is not driven in this part.

9 shows an example in which the drum is accelerated so that the induction module is driven at approximately 15 RPM. Similarly, the drum can be decelerated so that the induction module is off at approximately 15 RPM. However, since the drum RPM is expected to increase after the acceleration of the drum, the induction module can be driven, but the drum RPM is expected to decrease after the deceleration of the drum. Therefore, it is preferable that the induction module is turned off in synchronization with the motor off time. This is because heating the drum is ultimately for heating the fabric and washing water, not for heating the drum itself.

Through the correlation between the drum and the driving section of the induction module, effective heating and overheating of the drum can be prevented. In addition, the overheating of the fabric can also be prevented.

In Fig. 9, the driving of the circulation pump is not shown. However, it may be applied in the same manner as the driving of the circulation pump illustrated and illustrated in FIG. 5.

It is preferable to make the driving section of the circulation pump and the driving section of the induction module substantially the same. This is because the washing water is delivered to the drum and the cloth by the circulation pump. Since washing water having a low temperature is supplied to the drum having the highest temperature, overheating of the drum and the fabric may be prevented.

Meanwhile, a method of increasing stability as well as controlling the induction module by driving the induction module and driving the drum and / or interlocking the circulation pump may be required. To this end, the above-described drying temperature sensor may be provided.

Even if the induction module is running, the induction module may be forcibly turned off when the drying temperature sensor detects overheating of the drum. That is, it may be forcibly turned off even when the induction module is being driven in conjunction with drum driving. Of course, at this time, it is preferable that the drum driving is continued.

For example, if the drum drive set to turn on the motor for 36 seconds detects overheating of the drum at the drying temperature sensor from the start time to 30 seconds, the driving of the induction module may be turned off immediately. And the motor can be on for the remaining 6 seconds. That is, in the case of forcibly turning off the induction module, maintaining the drum driving can effectively transfer heat to the cloth and wash water. In addition, the driving of the circulation pump may be controlled like the drum driving. That is, the drum and the circulation pump may be controlled to be driven for a predetermined time even if the induction module is forcibly terminated.

Hereinafter, with reference to FIGS. 10 and 11, the washing performance (shown in FIG. 10) of the conventional washing machine will be compared with the washing performance (shown in FIG. 11) according to the present embodiment. Particularly, in order to compare the washing performance results using factors such as the amount of washing water, washing temperature, circulation pump, and drum driving in the heating section.

The fourth column of FIG. 10 refers to washing performance and conditions in general washing of a conventional washing machine.

In the heating section, it can be said that the washing water is heated to 40 degrees Celsius, and it is a general washing condition that is approximately 2-4 liters of the amount of washing water required in addition to the foaming. As described above, in this case, the driving of the circulation pump should be limited or excluded regardless of the driving pattern of the drum. Under normal washing conditions, the washing performance is 100% and this can be referred to as the standard washing performance.

As shown in the second column and the third column, it can be seen that the heating section cannot be performed as the amount of washing water is smaller than the reference condition, so that the driving of the circulation pump is limited regardless of the driving pattern of the drum. Therefore, the washing performance is inevitably lower than the standard washing performance.

As shown in the fifth column, it can be seen that as the amount of washing water becomes larger than the reference condition, it is possible to drive the circulation pump regardless of the driving pattern of the drum in the heating section. Since the amount of washing water increases, the washing temperature will be about 34 degrees Celsius lower than 40 degrees Celsius by using the same energy. Therefore, since the washing water temperature is low and the detergent concentration is low, the washing performance is inevitably lower than the standard washing performance.

The fourth column of FIG. 11 indicates washing performance and conditions in general washing of the washing apparatus according to the present embodiment. The difference between the washing performance and the reference condition of the above-described conventional washing machine is not great. This is because the circulation pump can be driven in the heating section, and the running rate of the motor can be further increased, but the temperature condition and the detergent concentration condition are similar. Of course, the fifth column can be said to be similar.

However, according to the present embodiment, it can be seen that the amount of washing water is only required to be smaller than that of the conventional washing machine, and further, heating can be performed in an amount of 0 to 1 liter. This condition is shown in the third column. It can be said to be the optimum condition in this embodiment.

Since the amount of washing water is small, it is possible to further increase the washing temperature and increase the detergent concentration through the same energy. In addition, the circulation pump can be driven according to the driving pattern of the drum. Therefore, very economical and effective washing is possible, and a more high performance washing effect can be caused.

Of course, as shown, when there is little residual water, the heating temperature can be increased, which can bring washing performance similar to the reference performance.

As described above, according to this embodiment, it is possible to implement laundry logic or laundry conditions that cannot be implemented in a conventional laundry apparatus, thereby enabling very economical and effective laundry.

10: tub 11: heater mounting portion
12: washing water heater 15: drum
16: lifter 20: control unit

Claims (25)

In the tub, the drum and the control method of the washing machine having an induction module for heating the drum by induction mounted on the tub,
A water supply step of supplying washing water into the tub through a water supply valve; And
After the water supply step, a heating step of driving the induction module to heat,
In the heating step, the driving of the drum and the driving of the induction module are controlled to interlock,
The drum driving section includes a section in which the induction module is driven, and the driving method of the washing machine is characterized in that the driving of the induction module is excluded outside the section in which the drum is driven. According to claim 1,
The driving method of the drum comprises a tumbling drive. According to claim 1,
The on / off timing of the motor for driving the drum and the on / off timing of the induction module are the same. According to claim 1,
In the heating step, a control method of the washing machine, characterized in that the on-time of the induction module is later than the on-time of the motor. The method of claim 4,
The induction module is accelerated after the on-point of the motor is turned on when the rotation RPM of the drum is above a predetermined RPM lower than the tumbling RPM. The method of claim 4,
The control method of the washing machine, characterized in that the off time of the motor and the off time of the induction module are the same. The method of claim 4,
The induction module off time is slower than the motor off time and earlier than the drum stop time. The method of claim 7,
The induction module, the control method of the washing machine, characterized in that when the RPM of the drum is decelerated after the motor is off, and the rotation RPM of the drum is lower than or equal to a predetermined RPM lower than the tumbling RPM. According to claim 1,
The washing device further includes a drying temperature sensor for sensing the temperature of the drum,
The induction module, the control method of the washing machine, characterized in that the driving of the induction module is forcibly turned off when the drying temperature sensor detects an abnormal temperature before being turned off in conjunction with the driving of the drum. The method of claim 9,
The driving method of the washing machine is characterized in that it is repeated a plurality of times in the heating step. The method of claim 10,
The washing device further includes a washing water temperature sensor for sensing the temperature of the washing water in the tub,
The washing water temperature sensor is a washing machine control method characterized in that it is provided to sense the temperature of the washing water when the drum is stopped. The method of claim 11,
The heating step, the control method of the washing machine characterized in that the washing water temperature sensor is terminated when it detects a preset temperature. The method according to any one of claims 1 to 12,
The washing device includes a circulation pump that pumps the washing water inside the tub and supplies it to the upper portion of the drum.
In the heating step, the driving method of the washing machine is characterized in that the driving of the drum and the driving of the circulation pump are interlocked. The method of claim 13,
The on / off timing of the motor for driving the drum and the on / off timing of the circulation pump are the same. The method of claim 14
The heating step is a washing machine control method characterized in that is performed in a state where the level of the washing water is lower than the lowermost portion of the drum. The method of claim 15,
The washing level in the heating step, the control method of the washing apparatus characterized in that the circulation level formed by the washing water of the same amount or less than the amount of washing water filled in the circulation path for driving the circulation pump. The method of claim 15,
The amount of washing water stored in the tub in the heating step to form the circulating water level is less than 1 liter. The method of claim 15,
In the heating step, the driving of the drum comprises a tumbling drive and a filtration drive. The method of claim 18,
In the heating step, the driving of the drum includes a cyclic driving in which filtration driving is continuously performed in the tumbling driving. The method of claim 19,
In the heating step, the tumbling driving, stopping and circulation driving of the drum is repeatedly performed, characterized in that the control method of the washing machine. A tub for receiving wash water;
A drum rotatably provided inside the tub and accommodating a gun therein;
A motor driving the drum;
An induction module mounted on the tub to heat the drum through induction heating;
A water supply valve provided to supply washing water into the tub;
A water level sensor that senses the level of washing water in the tub; And
It includes a control unit for controlling the driving of the motor, the induction module and the water supply valve,
The control unit,
The on / off of the motor and the on / off of the induction module are controlled to interlock,
If the RPM of the drum after the motor is turned on and the predetermined RPM is greater than or equal to the target RPM, the washing machine is characterized in that the induction module is controlled to be driven. The method of claim 21,
The control unit,
When the motor is off or after the motor is off, if the drum is below a predetermined RMP before stopping, the induction module is controlled to be turned off. The method of claim 21 or 22,
Further comprising a drying temperature sensor for sensing the temperature of the drum,
When the temperature detected by the drying temperature sensor is above a predetermined temperature, the control unit excludes the interlocking control of the motor and the induction module, and forcibly turns off the induction module. The method of claim 23,
When the time required to turn off after starting the motor is set, and the induction module is forcibly turned off before the predetermined time elapses,
The control unit controls the motor to be turned off after a lapse of the predetermined time. The method of claim 24,
Further comprising a circulation pump for pumping the washing water inside the tub to supply the inside of the drum,
The control unit controls the operation of the motor and the operation of the circulation pump to be interlocked.

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