KR20100128658A - Washing machine and controlling method of washing machine - Google Patents

Abstract

PURPOSE: A washing machine and a controlling method thereof are provided to prevent a drum from moving forward during high speed rotation and increase the capacity of a washing apparatus by the change of a washing apparatus. CONSTITUTION: A controlling method of a washing machine comprises following steps. A dehydration beginning step is performed by the rotation of a drum(S110). In the dehydration beginning, a check valve member is operated by the rotation of the drum to close the vent part formed on a tub(S120). The inner pressure of the tub, in which a drum is rotatably installed, is detected(S130). Whether the dehydration processes is performed or not determined by the comparison of the detected pressure and the preset pressure.

Description

Washing machine and controlling method of washing machine

The present invention relates to a laundry machine and a method for controlling the laundry machine, and more particularly, to a washing machine and a method for controlling the laundry machine to increase the volume capacity of the laundry machine and to relieve pressure anxiety of the laundry machine. .

In general, the washing machine is a product that removes various contaminants attached to clothes and bedding by using the emulsification of the detergent and friction action of the water flow due to the rotation of the pulsator or drum and impact on the laundry. Recently appeared automatic washing machine automatically proceeds a series of steps leading to a washing course, rinsing course, dehydration course, etc. without the user's operation in the middle.

Recently, the demand for a drum-type washing machine, which can reduce the overall height as compared to the pulsator washing machine that rotates with the washing tank standing, and hardly causes the laundry to be twisted and wrinkles on the laundry, is increasing. Is in.

Briefly describing the structure of the drum-type laundry machine as described above, the main body cabinet forming the outer shape, the tub which is located inside the main cabinet and supported by the damper and the spring and the wash water is stored, and the inside of the tub The drum is largely divided into a cylindrical drum into which laundry can be put, and the drum receives a driving force by a driving unit for washing laundry put into the drum.

The drum type laundry machine having the structure described above inevitably causes vibration due to the rotational force of the drum and the eccentricity of the laundry when the drum is rotated to wash and dehydrate the laundry put into the drum. The vibration generated is transmitted to the outside through the tub and the cabinet.

Accordingly, in order to prevent the vibration transmitted from the drum to the tub to the cabinet, a spring and a damper are essentially provided between the tub and the cabinet to cushion and mitigate the vibration of the tub.

On the other hand, in the case of the drum-type laundry machine as described above is not installed separately, but installed in the existing installation environment (for example, sink environment or built-in environment). Therefore, in the case of drum-type washing machine should be limited to fit the installation environment in which the size is installed.

As described above, in the drum type washing machine, the internal structure is limited by the spring and the damper structure for reducing vibration between the tub and the cabinet, and the washing machine itself is limited due to the limited installation environment of the washing machine. Changing the size is limited.

On the other hand, in recent years, many researches and developments are being made on increasing the washing capacity of the washing apparatus in order to increase the washing amount and the convenience of the user. However, in the structure of the conventional drum type washing machine due to the above-described limitations, there are many difficulties in increasing the size of the tub in order to increase the washing capacity. As described above, in order to increase the washing capacity, development of washing apparatuses having various structures is emerging.

On the other hand, in the case of the drum-type washing machine as described above, as the drum rotates at high speed, pressure changes occur inside the drum and outside the drum. That is, while the air remaining in the space inside the drum moves to the outside of the drum by the centrifugal force generated by the high speed rotation of the drum, the pressure inside the drum is lowered, and the pressure outside the drum is increased.

On the other hand, the pressure change of the inside and the outside of the drum as described above brings the phenomenon that the rotating drum is forcibly moved to the front side of the tub. This phenomenon occurs as the drum rotates at a high speed, and there is a problem in that the outside front of the drum and the inside front of the tub come into contact with each other to generate noise and damage.

The present invention is to solve the problems as described above, by changing the structure of the washing machine can increase the capacity of the washing machine, the control method of the washing machine and the washing device to prevent the advance of the drum. The purpose is to provide.

Control method of the laundry machine according to an embodiment of the present invention for achieving the above object is a dehydration start step of performing a dehydration stroke by rotating the drum, the pressure for detecting the internal pressure of the tub rotatably installed It is preferable to include a detection step, a determination step of determining whether or not dehydration progress by comparing the detected pressure and the preset pressure.

Preferably, the dehydration start step further includes a valve operation step of closing the vent provided on the tub by operating the check valve member as the drum rotates.

The valve actuation step preferably includes a step of selectively operating a plurality of check valve members located on the rear side of the drum.

The pressure sensing step is preferably detected by a water level sensor provided to detect the quantity of wash water supplied to the tub.

The pressure sensing step is preferably detected by a pressure sensor for detecting a pressure change in the tub.

In the determining step, when the pressure value in the tub is included in a predetermined pressure range, it is preferable to proceed with normal dehydration stroke.

If the pressure value in the tub is not included in the predetermined pressure range in the determination step, it is preferable to reduce the rotational speed of the drum.

When the pressure value in the tub is not included in the predetermined pressure range in the determination step, it is preferable to stop the rotation of the drum.

In the determining step, if the pressure value in the tub is not included in the predetermined pressure range it is preferable to further include a display step for indicating the abnormal operation of the check valve member.

Washing apparatus according to an embodiment of the present invention for achieving the above object is a cabinet to form an outer shape, the tub is fixed to the inside of the cabinet, the sensor is provided to detect the water supply amount, and the inside of the tub A drum which is rotatably provided, and a suspension assembly for buffering the drum, wherein the tub includes a vent part and a check valve member for stabilizing the internal pressure of the tub, and the check is performed according to the pressure change of the tub. It is preferable to have a control section for reading the operating state of the valve member.

The sensor is preferably provided as a pressure sensor for detecting the pressure of the wash water stored in the tub to calculate the water supply.

The sensor is preferably provided as a pressure sensor for detecting the air pressure of the tub.

Preferably, the vent part includes a plurality of vent parts provided on the rear side of the tub, and a plurality of check valve members for controlling the opening and closing states of the vent parts.

Preferably, the check valve member is an active check valve that opens and closes the vent part under control of the controller.

The controller may decelerate the rotation of the drum when the pressure change of the tub exceeds a preset pressure range.

The control unit preferably stops the rotation of the drum when the pressure change of the tub exceeds a preset pressure range.

The control unit preferably displays abnormal operation of the check valve member when the pressure change of the tub exceeds a preset pressure range.

Washing apparatus according to another embodiment of the present invention for achieving the above object is a cabinet that forms the outer shape, the tub is fixed to the inside of the cabinet, the sensor is provided to detect the water supply, and the inside of the tub It is preferable to have a drum provided to be rotatable, and a suspension assembly for supporting the drum to be buffered and to calculate a pressure change of the tub according to a detection signal of the locking sensor.

The tub is provided with a vent and a check valve member for stabilizing the internal pressure of the tub, the control unit preferably reads the operating state of the check valve member in accordance with the pressure change of the tub.

According to the control method of the washing apparatus and the washing apparatus according to the present invention, it is possible to increase the capacity of the washing apparatus by changing the structure of the washing apparatus. In addition, it is possible to prevent the drum from moving forward during the high speed rotation of the drum.

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

In describing the present invention, the names of the elements defined are defined in consideration of functions in the present invention. Therefore, it should not be understood as a meaning limiting the technical components of the present invention. In addition, each name defined in each component may be referred to as other names in the art.

First, with reference to the accompanying drawings will be described in detail a washing apparatus according to an embodiment of the present invention.

As shown in FIGS. 1 to 3, the washing apparatus 100 according to the present invention includes a cabinet 110 having an external appearance as shown, a tub 120 fixedly installed inside the cabinet 110, and a tub ( 120, the drum 140 is rotatably installed, the rotating shaft 150 penetrating the rear of the tub 120 is connected to the drum 140, and the bearing housing 160 for supporting the rotating shaft 150 And a drive motor 170 provided in the bearing housing 160 to transmit rotational force to the rotating shaft 150, and coupled to the bearing housing 160 to support structures connected to the bearing housing 160, and at the same time vibrate and / or It is provided with a suspension assembly 180 for cushioning the shock, and a control unit 190 to control the operation of the washing apparatus 100 in association with each component, and to perform a set washing stroke.

The cabinet 110 includes a base 111 on which each component is supported and seated, a front panel 112 formed with an opening 112a for loading laundry, and additionally left / right panels 113 (not shown), A rear panel 115 and a top panel 116 are provided. Here, the opening 112a of the front panel 112 controls the door 112b for closing the opening 112a and each component of the washing apparatus 100, or displays the operating state of the washing apparatus 100. The control panel 117 is provided.

The control panel 117 is provided on the upper side of the front panel 112 and is provided with an operation unit 118 for controlling the operation of the washing apparatus 100 and a display unit 119 for displaying the operating state of the washing apparatus 100. . Here, the operation unit 118 and the display unit 119 are connected to the control unit 190 to control the operation of the washing apparatus 100 or to display the operating state of the washing apparatus 100.

Tub 120 is fixed to the interior of the cabinet 110 by a separate combination (for example, screw screws, bolts, etc.). For example, the front panel 112 and the rear panel 115 of the cabinet 110 or the left and right panels 113 (not shown) is fixed by the combination and the support member not shown.

The tub 120 is in contact with the door (112b) to the front side is formed with an inlet 121 is opened so that laundry can be put. The inlet 121 has a front gasket 122 for maintaining airtightness with the opening 112a formed in the front panel 112.

The front gasket 122 is formed with a spray nozzle 123 to allow the washing water discharged through the water supply hose 127 and the circulation hose 135 to be diffused into the drum 140. The washing water supplied when the washing water is supplied by the spray nozzle is widely spread into the drum, and the laundry object inside the drum 140 may be uniformly supplied with the washing water regardless of whether the drum 140 is rotated.

On the rear side of the tub 120 is provided with a tub back wall 124 is inserted into the rotary shaft 150, the tub back wall 124 is movable to the rear of the tub 120 by a ring-shaped rear gasket 125 Combined. The vibration of the drum 140 is prevented from being transmitted to the tub by the tub back wall 124 and the rear gasket 125.

In addition, the inside of the tub 120 is provided with a water level sensor 137 for sensing the amount of washing water supplied into the tub 120. The water level sensor 137 is preferably provided as a pressure sensor for measuring the pressure applied by the wash water.

Here, the water level sensor 137 detects the amount of washing water supplied to the tub 120 during the administration of washing and rinsing, and transmits the amount of washing water to the controller 190. In addition, when the internal pressure of the tub 120 is changed by the drum 140 rotating at high speed during the dehydration stroke, it is detected and transmitted to the controller 190. As another example, a separate pressure sensor (not shown) for sensing the pressure in the tub 120 may be provided.

In addition, the upper surface of the tub 120 is provided with a plurality of vents 138 in communication with the outside of the tub 120 to ensure the breathability of the tub 120. Each vent part 138 is provided with a check valve member 139 to prevent detergent foam or the like from being discharged to the outside of the tub 120 through the vent part 138 during washing. In addition, in front of the tub 120, a separate air inlet hole (not shown) for introducing air outside the tub 120 into the tub 120 is provided.

Vent portion 138 is preferably installed in the upper front of the tub 120 and the rear of the tub 120, respectively. That is, the vent 138 may be provided in a 2vent-2out structure to secure ventilation performance.

Looking at the function of the vent unit 138, when the washing apparatus 100 is not used, the air is opened through the vent unit 138 so that the smell inside the tub 120 is exhausted, and the tub 120 is discharged. Allow moisture to remain in the drying. In addition, when the pressure difference between the drum 140 and the drum 140 is generated during the high speed rotation of the drum 140, the drum 140 is closed to stabilize the pressure in the tub 120, so that the drum 140 is in front of the tub 120. Prevents the phenomenon of advancing to the side.

That is, the check valve member 139 of the tub 120 is closed when the drum 140 rotates at high speed as in the dehydration stroke, and air is discharged from a separate air inlet hole (not shown) formed in front of the tub 120. While flowing in, the drum 140 may be prevented from moving forward due to an internal pressure difference with the tub 120 during the high speed rotation of the drum 140. Here, opening and closing of the check valve member 139 may be selectively performed according to the pressure change in the tub 120, but is not limited thereto.

The check valve member 139 prevents detergent foam and steam from flowing out of the tub 120 during washing through the vent part 138. The check valve member 139 may be provided in two forms, a type manually controlled by the pressure in the tub 120 and an active controlled type for opening and closing the vent part 138 according to the control of the controller 190. .

Manual control means that the check valve member (by the direct rising pressure generated by the high-speed rotation of the drum 140 or when the detergent foam or steam (in the case of a dry laundry machine) to rise through the vent 138) ( 139) operation is controlled. The check valve member 139 of the manual control type is mainly used as a flapper type, a shape enterprise alloy type, and a floating type.

As such, when the check valve member 139 of the manual control type is applied, a pressure difference does not occur between the tub 120 and the drum 140 when the drum 140 is rotated. Can be prevented. In addition, it is possible to prevent detergent foam or steam from being discharged while the laundry apparatus 100 is operating.

Active control is to artificially supply power to control the operation of the check valve member 139 to prevent detergent foam or steam from escaping through the vent part 138 while power is supplied (or not supplied). .

When the check valve member 139 of the active control type is applied, the efficiency is improved compared to the manual control type in which the check valve member 139 operates only due to the internal pressure difference and steam or detergent removed when the drum 140 rotates. It works. The active control type check valve member 139 is typically a magnet type (magnet).

In addition, the upper side of the tub 120 is provided with a water supply unit 126 for supplying the washing water to the inside of the tub 120, the lower side of the tub 120 to drain and wash the water supplied to the tub 120 A drain 132 is circulated.

The water supply unit 126 is provided on the water supply hose 127 and the water supply hose 127 so as to supply water from the external water source into the tub 120, the water supply valve 128, the water supply hose to control the access of water Detergent supply device 129 is a detergent supply device so that the water supplied through the 127 is introduced into the tub 120 with the detergent, and water and / or detergent passing through the detergent supply device 129 drum 140 A supply hose 131 is supplied to the inside of the).

The drainage part 132 includes a drain hose 134 for discharging the wash water in the tub 120, a drain pump 133 for moving the wash water passing through the drain hose, and wash water moved by the drain pump 133. The circulation hose 135 for circulating the back to the inside of the tub 120, and a flow path valve 136 for determining the path of the wash water moved by the drain pump 133 is installed.

The drum 140 is rotatably provided inside the tub 120, and the above-described rotary shaft 150 is coupled to the rear end thereof. The inner surface of the drum 140 is provided with a lift 141 for moving the laundry. In addition, the front and / or rear of the drum 140 is provided with a weight balancer 142 for balancing to suppress the vibration of the drum 140 when dewatering.

The bearing housing 160 is coupled to the tub back wall 124 located at the rear of the tub 120. The rotating shaft 150 coupled to the drum 140 penetrates into the bearing housing 160. The bearing housing 160 is provided with a bearing (not shown) so that the rotating shaft 150 rotates smoothly, and the rotating shaft 150 is supported by a bearing (not shown).

The drive motor 170 is assembled to the rear of the bearing housing 160 to rotate the rotating shaft 150. The drive motor 170 is provided to control the speed by the controller 190 (not shown). The structure and type of the driving motor 170 are well known to those skilled in the art, and various embodiments are possible, so detailed description thereof will be omitted.

The suspension assembly 180 includes a damper bracket 181 coupled to the bearing housing 160 and a damper portion 184 coupled to the damper bracket 181 to mitigate vibrations and shocks transmitted to the damper bracket 181. Is done.

Damper bracket 181 is coupled to the bearing housing 160, a pair of vertical brackets 182 extending downward from the outside of the bearing housing 160, and is coupled to the end of each of the vertical brackets 182, respectively, It is provided with a horizontal bracket 183 extending to the front side of the 120. Here, the pair of vertical brackets 182 and horizontal brackets 183 may be formed symmetrically with respect to the center of the bearing housing 160 as a reference line.

The damper part 184 is installed between the base 111 and each horizontal bracket 183 to support the horizontal bracket 183. The damper part 184 supports each horizontal bracket 183 and at the same time a spring damper 185 for damping and absorbing the vertical displacement, and an oil damper for damping the horizontal displacement applied to the horizontal bracket 183. 186).

Here, the spring damper 185 is installed between the end of the base 111 and the horizontal bracket 183 in a vertical direction, each additionally located between the bearing housing 160 and the base 111 bearing housing 160 ) Is installed to support. The spring damper 185 maintains the drum 140 supported inside the tub 120 and buffers and attenuates the vertical vibration generated when the drum 140 rotates.

In addition, the oil damper 186 is provided between each central portion of the horizontal bracket 183 and the base 111, and is installed to be inclined downward in a direction parallel to the rotation axis direction of the drum 140. The oil damper 186 attenuates the horizontal vibration generated when the drum 140 rotates.

The controller 190 controls the overall washing operation (eg, washing stroke, rinsing stroke, dehydration stroke, etc.) of the washing apparatus 100, and operates the washing apparatus 100 according to the setting of the washing apparatus 100. . In particular, the control unit 190 selectively performs a rinsing stroke according to the fluctuation amount signal of the wash water in the tub 120 detected by the water level sensor 137 during the rinsing stroke.

Meanwhile, the laundry machine having the above-described configuration may be further provided with a steam supply device and a hot air supply device, and the drying and regeneration (refresh) administration of the laundry may be additionally performed by the steam supply device and the hot air supply device. Can be.

Hereinafter, an operation process of the washing apparatus as described above will be described in detail with reference to the accompanying drawings. Components and reference numbers described below will be understood with reference to the drawings and the description above.

4 to 5 will be described in detail a control method of the laundry machine according to the present invention.

The washing apparatus 100 according to the present invention may generally perform a washing stroke, a rinsing stroke, and a dehydrating stroke. In the combined washing machine, a washing stroke may be further provided after the dehydrating stroke.

The control method of the washing apparatus according to the present embodiment is to prevent the drum from moving forward due to the pressure difference in the tub 120 as the drum 140 of the washing apparatus 100 rotates at a high speed. In this regard, administrative descriptions other than the dehydration administration will be briefly described as they may blur the gist of the present invention. However, the present invention is not limited thereto, and may be applied to a process (eg, preliminary dehydration performed at the time of rinsing administration) for dewatering laundry in the middle of each stroke.

In the washing stroke, water is initially supplied to repeatedly rotate the drum 140 in the forward or reverse direction to perform washing. In the rinsing stroke, the washing process is dehydrated and watered, and the drum 140 is rotated to rinse.

On the other hand, in the dehydration stroke to rotate the drum 140 at high speed to remove the water of the laundry object (step S110). Here, the check valve member 139 provided in the vent part 138 of the tub 120 is operated by the rotation operation of the drum 140 (step S120). In the case of the check valve member 139 of the manual control type is operated by the pressure change generated as the drum 140 is rotated, in the case of the check valve member 139 of the active control type to control the control unit 190. It is operated according to opening and closing.

Thereafter, the controller 190 detects the pressure in the tub 120 through the water level sensor 137 (or the pressure sensor and the water level sensor 137 described below) (step S130). Here, the level sensor 137 detects different pressures according to the open / closed state of the check valve member 139.

As illustrated in FIG. 5, the plurality of check valve members 139 (2vent-2out, that is, the two vent parts 138 are described as an example in the present invention) are all or selectively closed, so that the water level sensor ( 137 senses different pressures. In addition, as the rotational speed of the drum 140 increases, the pressure value detected by the water level sensor 137 also increases proportionally.

That is, the highest pressure value is detected when the vent parts 138 are all closed, and the lowest pressure value is detected when all the vent parts 138 are open. On the other hand, the control unit 190 may have a predetermined pressure value of the normal closed state of the vent unit 138 during the dehydration operation.

The control unit 190 compares the pressure value detected by the water level sensor 137 with a preset value to determine the closing and operating state of the vent unit 138 (step S140).

Here, when the pressure value detected by the water level sensor 137 is less than or equal to the preset value, it may be determined that the vent unit 138 does not operate normally.

On the other hand, the control unit 190 can check the normal operation by repeatedly detecting the pressure in the case of the manual control type check valve member 139, and in the case of the active control type check valve member 139 iterative operation control Through the check valve member 139 can be additionally checked the operating state.

Here, the controller 190 is a pressure value detected by the water level sensor 137 despite the repetitive pressure detection in the tub 120 and the repeated operation control of the check valve member 139 is a preset value. In the case below, it is determined that the check valve member 139 does not operate normally.

In this case, the controller 190 may indicate to the user that an abnormal operation has occurred in performing the dehydration operation through the display unit 119 of the control panel 117 or a separate speaker (not shown) (step S150).

In addition, when abnormal operation is continued, the outside front of the drum 140 and the inside front of the tub 120 may come into contact with each other by the advancement of the drum 140 due to the pressure change in the tub 120, thereby causing noise and damage. have.

The controller 190 may stop the dehydration stroke by controlling the drive motor to stop the rotational speed of the drum 140 (step S160). In addition, the controller 190 may control the driving motor to reduce the rotational speed of the drum 140 to such a degree that the forward phenomenon of the drum 140 does not appear.

On the other hand, in the process of detecting the pressure in the tub 120 through the water level sensor 137 as described above (step S130), the controller 190 is a separate operation if the detected value is included in the preset pressure range Proceed to the end of the dehydration administration without performing (step S170).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, The present invention may be modified in various ways. Therefore, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

1 is a perspective view schematically showing a washing apparatus according to the present invention.

2 is a side view showing the structure of a laundry machine according to the present invention.

Figure 3 is a block diagram showing the configuration of a washing apparatus according to the present invention.

Figure 4 is a flow chart illustrating a control method of a laundry machine according to the present invention.

5 is a graph showing a detection signal of the water level sensor in the washing apparatus according to the present invention.

Claims (19)

Dehydration start step of performing the dehydration stroke by rotating the drum, A pressure sensing step of sensing an internal pressure of the tub rotatably installed in the drum, And a determination step of determining whether to proceed with dehydration by comparing the detected pressure with a preset pressure. The method according to claim 1, further comprising a valve operating step of closing a vent provided in the tub by operating a check valve member as the drum is rotated in the dehydration start step. The method of claim 1, wherein the operation of the valve comprises the step of selectively operating a plurality of check valve members located at the rear side of the drum. The method of claim 1, wherein the pressure sensing step is detected by a water level sensor provided to detect a quantity of wash water supplied to the tub. The method of claim 1, wherein the pressure sensing step is detected by a pressure sensor for detecting a pressure change in the tub. The control method according to claim 1, wherein, in the determining step, when the pressure value in the tub is included in a predetermined pressure range, a normal dehydration stroke is performed. The washing method according to claim 1, wherein in the determining step, when the pressure value in the tub does not fall within a predetermined pressure range, the rotation speed of the drum is reduced. The control method according to claim 1, wherein the rotation of the drum is stopped when the pressure value in the tub is not included in a predetermined pressure range in the determining step. The control method according to claim 6, further comprising a display step of indicating an abnormal operation of the check valve member when the pressure value in the tub is not included in a predetermined pressure range in the determining step. . The cabinet forming the appearance, A tub fixed to the inside of the cabinet and provided with a sensing sensor sensing a water supply amount; A drum rotatably provided inside the tub; A suspension assembly for buffering the drum, The tub is provided with a vent and a check valve member for stabilizing the internal pressure of the tub, the washing apparatus characterized in that it comprises a control unit for reading the operating state of the check valve member in accordance with the pressure change of the tub. The laundry machine according to claim 10, wherein the detection sensor is provided as a pressure sensor that detects a pressure of the wash water stored in the tub and calculates a water supply amount. The washing apparatus according to claim 10, wherein the detection sensor is provided as a pressure sensor for detecting the air pressure of the tub. The method of claim 10, wherein the vent portion A plurality of vent parts provided at a rear side of the tub, Washing apparatus comprising a plurality of check valve member for controlling the opening and closing state of each vent. The washing apparatus according to claim 10, wherein the check valve member is an active check valve that opens and closes the vent part under control of the controller. The washing apparatus as set forth in claim 10, wherein the control unit decelerates the rotation of the drum when the pressure change of the tub exceeds a preset pressure range. The washing apparatus according to claim 10, wherein the controller stops the rotation of the drum when the pressure change of the tub exceeds a preset pressure range. The washing apparatus according to claim 15, wherein the control unit displays an abnormal operation of the check valve member when the pressure change of the tub exceeds a preset pressure range. The cabinet forming the appearance, A tub fixed to the inside of the cabinet and provided with a sensing sensor sensing a water supply amount; A drum rotatably provided inside the tub; A suspension assembly for buffering the drum, And a control unit for calculating a pressure change of the tub according to the detection signal of the locking sensor. The method of claim 18, The tub has a vent and a check valve member for stabilizing the pressure inside the tub, The control unit is a washing apparatus, characterized in that for reading the operating state of the check valve member according to the pressure change of the tub.

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