JP2005160510A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correct a water level detecting error due to pressure fluctuation in a water tub when supplying water in a machine detecting a water level by a pressure sensor. <P>SOLUTION: This washing machine, when supplying the water for washing and rinsing, detects an initial predetermined water level W1 before reaching a predetermined target water level W0, when detecting the initial predetermined water level W1, suspends the water supplying operation for a predetermined time, compares a changed water level W2 with the initial predetermined water level W1, and adjusts the target water level W0 based on its difference α, or the detection result. When the pressure of the water tub 2 tends to be high and the changed water level W2 is detected low, the target water level W0 is upwardly revised according to the difference α. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a washing machine that performs water supply control based on water level detection using a pressure sensor.

  Conventionally, the amount of water supplied to the washing tub is controlled to a target water level in accordance with the amount of laundry so as to obtain an effective cleaning performance based on the required amount of water. However, the laundry is usually put into the washing tub in a dry state at the beginning, and in the washing process after the water supply reaching the target water level, the laundry subjected to the stirring action sufficiently absorbs water. The water level drops and the desired cleaning performance cannot be obtained, and the laundry is damaged. Therefore, the water absorption amount corresponding to the amount of laundry is stored in advance, and the water supply capacity is calculated based on the detection time until the target water level, and the water supply required time corresponding to the water absorption state is calculated. Proposals have been made to ensure the amount (see, for example, Patent Document 1).

By the way, as a means for detecting the water level in the washing tub, a well-known pressure sensor is employed as described in Patent Document 1, and the detected pressure is controlled instead of the oscillation frequency signal. However, recently, it has been found that the detection of the water level of the pressure sensor, which is the basis of this water level control, malfunctions, leading to a situation in which a predetermined target water level cannot be obtained, and many of them are controlled to a low water level, causing problems due to insufficient water volume. Has occurred. However, this is not a malfunction due to a failure of the pressure sensor itself.
Utility Model Registration No. 2519387

    The background of the above problems will be described. A water tub capable of storing water is provided around a laundry tub that normally stores laundry and performs washing and dehydration. At present, the number of washing machines with a drying function is increasing, and taking into account the recent improvement in accuracy of assembly and manufacturing technology, in addition to preventing water leakage, the airtightness of the water tank has been improved from the viewpoint of improving drying performance and preventing steam leakage. One factor is that sex is greatly enhanced. In other words, when the water tank is in a substantially sealed state where airtightness is improved so that it also serves as a drying chamber and loses the escape space for pressure, the pressure in the water tank is temporarily increased suddenly by water supply to the washing tub during water supply, The sensor detects and operates at the water level before reaching the target water level, and the necessary amount of water cannot be obtained. However, since the water tank is not strictly hermetically sealed, the increased pressure leaks from the gaps of the doors and the like as time passes.

  In addition, a drainage system abnormality can be considered as a factor that induces the above-described situation more remarkably. In general, the drainage route connects the drainage from the bottom of the aquarium and the drainage from the overflow outlet to prevent an abnormal rise in water level to a single drainage hose, and its tip extends to a predetermined drainage site outside. ing. Therefore, in a normal state where the outside air communicates with the drain hose, the desired target water level is properly detected by the pressure sensor.

  However, when this drain hose curves across the steps of the room sill, waterproof pan, etc., it drains in the washing tub and the water tub even after draining, it remains in the curved inside of the drain hose and shuts off from the outside It becomes a state. For this reason, the pressure escape area is lost and the pressure in the water tank temporarily increases during water supply, and the pressure sensor malfunctions as described above to induce a water level error. However, except for the water level detection function using the pressure sensor described above, the normal washing machine can be operated without any problems, such as draining the water in the aquarium, so it is difficult for the user to grasp this as an abnormal phenomenon. It was.

  In order to solve the above problems, the present invention provides a washing machine in which a target detected water level is corrected as necessary to ensure a predetermined water supply amount while confirming a phenomenon of a water level error by a pressure sensor. The purpose is to provide.

  In order to achieve the above object, the washing machine of the present invention detects the water level in the washing tub disposed in the water tub with a pressure sensor and controls the water supply to the washing tub based on the water level detection signal. In the apparatus equipped with the control means, at the time of water supply, an initial predetermined water level before reaching a preset target water level is detected, and when the initial predetermined water level is detected, the water supply operation is stopped for a predetermined time, and after the stop time The main feature is that when the water level is lower than the initial predetermined water level, the target water level is corrected upward according to the difference in water level.

  According to the washing machine of the present invention, when the water level detected at the initial predetermined water level before reaching the initially set target water level becomes low after a predetermined time, this tends to temporarily increase the pressure in the water tank during water supply. Judging from the difference in water level, the target water level was corrected and set to a higher level so that the necessary water volume could be secured by the subsequent water supply. Therefore, even when water supply is performed under conditions where the water tightness of the water tank is high, water supply control can be performed so that the detection error of the water level by the pressure sensor can be corrected, and the expected cleaning performance can be obtained based on an appropriate amount of water supply. In addition, the damage to the laundry can be suppressed.

An embodiment of the present invention will be described with reference to FIGS. 1 to 4 applied to a drum type washing machine with a drying function.
First, in order to explain the schematic configuration of the whole washing machine in FIG. 3, a side view showing the main part in a cutaway manner will be described. Inside the housing 1 forming the outer shell, a slightly inclined horizontal axis cylinder is provided. The water tank 2 is elastically supported via an appropriate elastic support device 15 and the water tank 2 is substantially non-porous, except that the front surface side is largely opened for putting in and out the laundry. It is configured so that it can store water. A bellows 3 is provided in a watertight manner from the front opening of the water tank 2 to the front surface of the housing 1, and the bellows 3 is also in close contact with the inner surface of the door 4 that opens and closes the laundry entrance 1a. Accordingly, the water splashed from the water tub 2 and the washing tub described later by the bellows 3 is configured to be waterproof so that it does not leak into the inside or outside of the housing 1.

  In addition, a cylindrical drum 5 that can rotate around the same horizontal axis is provided inside the water tank 2, and the drum 5 has a large number of through holes 5 a in the peripheral wall, and the front surface side is the same as the water tank 2. The motor 7 is composed of a direct current brushless motor that is attached and fixed to the back portion of the water tank 2 through a drum shaft 6 that is widely opened and rotatably supported. Thus, the drum 5 functions as a washing tub for washing the thrown-in laundry by rotating the drum 5, rinsing, dehydrating and further drying.

  The water supplied to the water tank 2 and the drum 5 is connected to the bottom of the water tank 2 after use, and is discharged from the drain hose 9 through the drain valve 8 in the middle of the machine, and an excessive amount of water is supplied. In order to prevent this, the overflow port 10a is provided at a predetermined height position of the water tank 2, and the overflow hose 10 is connected thereto. The discharge side of the overflow hose 10 is connected to the drain hose 9 on the downstream side of the drain valve 8 so as to be unified and extended to a predetermined drainage place. Therefore, the water flowing into the overflow port 10a is immediately It can be discharged outside the machine.

  In addition, a water supply valve 11 serving as a means for supplying water to the washing tub is provided in the upper portion of the housing 1, and a water supply pipe 12 having a detergent charging case 13 is provided on the water supply valve 11 in the middle of the water tank 2. Are connected to each other so that water can be supplied into the drum 5. However, the amount of water supplied from the water supply valve 11 is controlled based on a control means described later based on a detection signal from the pressure sensor 14 that detects the water level in the drum 5, and the pressure sensor 14 is connected to the lower part of the water tank 2. The communication connection is established via the air tube 14a.

  In this embodiment, a hot air circulation path 16 is provided as a washing machine with a drying function. The hot air circulation path 16 is connected in communication from the lower back to the upper front of the water tank 2, and a heat exchanger 17, a blower 18, and a heater device 19 are sequentially arranged on the way. The heat exchanger 17 condenses and discharges moisture by cooling the hot air containing moisture after contributing to drying during the drying operation, and the heater device 19 efficiently removes the dehumidified dry air. It has a dehumidifying function for heating and warming well.

  In addition, the drainage hose 9 shown with a dashed-two dotted line in the same figure shows the use condition which got over the step part 26, such as a room sill or a waterproof pan, was extended to the drainage place, and was partially bent upwards and curved. . In this case, although there is no problem in the operation, a part of the water remains in the curved portion, and communication with the atmosphere through the drainage hose 9 and the overflow hose 10 is cut off. Therefore, an example is shown in which the airtightness in the water tank 2 is further increased and a substantially sealed state is predicted.

  Next, FIG. 4 is a block diagram showing the electrical configuration of the washing machine of the present embodiment. The control means 20 has a circuit configuration mainly composed of a microcomputer, and includes washing machine dehydration and drying operation. A control program for controlling the overall operation is stored, and the DC power supply of the DC power supply circuit 22 that converts the commercial AC power supply 21 to DC is used as the power supply. However, the motor 7 composed of a brushless motor includes a position sensor 23 composed of, for example, a Hall IC in order to detect the rotational position of the rotor, and is driven via an inverter circuit 24 based on a position detection signal output from the sensor 23. Be controlled. Further, the position sensor 23 counts pulses, which are rotational characteristics of rising and falling of the drum 5 storing the laundry at the start of the washing operation, and the control means 20 detects the amount of laundry based on this signal. Functions as a means.

  In addition, to describe the main electrical configuration, the operation panel key 25 for setting operating conditions, the pressure sensor 14 for detecting the water level in the washing tub, and the like are connected to the input port of the control means 20. Based on the input signal, the water supply valve 11, the drain valve 8, the blower 18, the heater device 19, and the like are controlled. In addition, based on the detection signal from the pressure sensor 14 which detects a water level as mentioned above, the control means 20 controls the water supply valve 11, and also has what is called a water supply control means. Incidentally, FIG. 2 shows a flowchart of the water supply control means, and FIGS. 1A and 1B are water supply controls by the control means 20 based on the fluctuation characteristics of the water level detected by the pressure sensor 14 in different states. It is an action explanatory view for explaining the means, and will be described in detail in the following action explanation section.

  Next, the operation of the washing machine having the above configuration will be described. In this kind of drum type washing machine, the washing process, the rinsing process, the dehydrating process, and the drying process as necessary are carried out successively by the rotation control of the drum 5, and the drum 5 is an inverter-controlled motor 7. Is driven at an appropriate rotational speed. Since such an operation process is generally well known, the description of the operation of the above process is omitted. Especially, with respect to the water supply control means that is the feature of the present invention, mainly the water supply process performed before the rinsing process, Hereinafter, description will be given along the flowchart of FIG. Further, referring to FIG. 1 (a), which shows the fluctuation characteristics of the water level when the drainage hose 9 is in a substantially hermetically sealed state with high airtightness in the water tank 2 as in the drainage state indicated by a two-dot chain line in FIG. I will explain. In FIG. 1, the vertical axis indicates the water level when detected by the pressure sensor 14, and the horizontal axis indicates an operation process that also serves as a time chart.

  First, after preparing for setting operation with various operation panel keys 25 (not shown), putting laundry into the drum 5, and further supplying detergent to the detergent charging case 13, the operation is started. When the motor 7 is driven and the detection signal from the position sensor 23 is received, the control means 20 detects the amount of laundry (step S1), determines the target water level W0 as the amount of water supply according to this, and slightly from the target water level W0. The initial predetermined water level W1 of the low water level (W0-a) is also determined (step S2). In this case, the target water level may be determined directly by the setting operation of the operation panel key 24 without using the laundry amount detecting means, and the initial predetermined water level may also be determined.

  In step S3, the water supply valve 11 serving as the water supply means is turned on to start a so-called water supply stroke, and the tap water is supplied into the water tank 2 through the water supply line 12 as shown by the broken line arrow in FIG. 5 is supplied. As the water supply is started, the detergent stored in the detergent charging case 13 is also poured into the water so that a part of the detergent is dissolved. Such a water supply operation is performed until the initial predetermined water level W1 is reached (step S4). When the water level W1 is reached, a signal obtained by detecting the pressure sensor 14 and replacing it with the oscillation frequency is input to the control means 20. . Incidentally, when the water level is detected, the motor 7 and the drum 5 are of course always driven in a stopped state.

  As shown in FIG. 1, the initial predetermined water level W1 has a tendency (indicated by A1) of the fluctuation (rise) line of the water level detected by the pressure sensor 14 up to the water level W1. In this case, the sudden rise phenomenon at the beginning of the rise of the water level is caused by the simultaneous supply of water into the water tank 2 and air in the water supply path such as the water supply pipe 12 and the detergent storage case 13 along with the water supply. This is because the pressure in the water tank 2 increases momentarily.

  Thus, when the initial predetermined water level W1 is detected, the water supply valve 11 is turned OFF (step S5), and the water supply operation is suspended for a predetermined time (for example, 8 seconds) (step S6). During this downtime, the pressure in the water tank 2 leaks and falls from various mating surfaces such as the door 4, the hot air circulation path 16, and the water supply path, and therefore the water level is indicated by the fluctuation line B1 in FIG. Thus, the water level gradually falls and the water level after the resting time is detected by the pressure sensor 14 as the fluctuating water level W2.

  As a result, the control means 20 detects the water level difference α between the initial predetermined water level W1 and the fluctuating water level W2 (step S8). In this case, as is clear from FIG. 1, the fluctuating water level W2 is lower than the initial predetermined water level W1, and therefore, it is determined in step S9 that the fluctuating water level W2 is low, the process proceeds to step S10, and the difference α is within a predetermined range. Whether inside or outside is determined. Then, the initially set target water level W0 is adjusted according to the difference, and the corrected target water level W3 is set.

  That is, the fluctuating water level W2 is the current substantial water level in the drum 5 or the water tank 2, and this is lower than the initial predetermined water level W1 because there is no or little pressure escape in the water tank 2 in a substantially sealed state. It can be seen that the water level detected by the pressure sensor 14 during the water supply operation is detected higher. Accordingly, naturally, the water level detected under the target water level W0 is insufficient, so that the water level corrected upward with respect to the target water level W0, that is, the so-called corrected target water level W3 is adjusted and set. It should be noted that the water level may be lowered due to water absorption by the laundry during this rest period (8 seconds). However, according to the results of actual measurement, it is understood that the water absorption during this period is minute and the fluctuation of the pressure is the main factor. ing.

  Therefore, if the difference α is a value within the predicted range in step S10, the process proceeds to step S11. For example, in this embodiment, the adjusted water amount β (α = β) equal to the difference α as shown in FIG. ) The water level is added to the initial target water level W0, and the corrected target water level W3 is set (step S14). However, in this embodiment, since the overflow port 10a is provided at a predetermined height position of the water tank 2, the correction target water level W3 is monitored so as not to exceed the overflow port 10a (corresponding to the overflow water level) ( In step S15), if the water level is set to exceed the overflow port 10a, the corrected target water level W3 is adjusted to a low level, for example, set to an overflow water level substantially in the vicinity of the overflow port 10a (step S16).

  As described above, when the corrected target water level W3 is set, the water supply valve 11 is turned ON again (step S17), water supply through the same water supply path as described above is resumed, and water is supplied into the water tank 2 and the drum 5 again. In FIG. 1, the water level rises as shown by a water level fluctuation line C1 having a tendency similar to the initial water level fluctuation line A1. Then, when the corrected target water level W3 is reached by this re-watering, the pressure sensor 14 detects this, and the water supply valve 11 is turned off to end the water supply stroke. However, although the process proceeds to the washing process thereafter, the corrected target water level W3 gradually decreases with the passage of time, and approaches the original target water level W0 to perform an effective washing action.

However, the water level lowering phenomenon in the washing process is not due to pressure relief (fluctuation) in the water supply process, and in this case, the water level lowering in the water tank 2 and the drum 5 is taken into account by the water absorption of the laundry. Then, the adjustment water amount β (in this case, α <β) may be set in consideration of the water level decrease due to the water absorption.
However, in the previous step S10, it can be assumed that even if there is a phenomenon in which the same water level is lowered, the difference α exceeds the prediction range and is detected very large. This is different from the fact that the pressure in the water tank 2 is gradually released, and an abnormal situation such as water leakage is also estimated.

  However, even in such a case, adding the adjusted water amount β equal to the abnormal difference α is an extremely high water level setting, and it is not safe to supply a large amount of water even temporarily, as the corrected target water level W0. Not suitable for setting. Therefore, an upper limit value is provided so that the amount of water to be adjusted is not set to an unnecessarily high water level, and in the case where the difference α is reduced to a level outside the preset range, the adjusted water amount β Is limited to the upper limit. Accordingly, when the water level difference α outside the range is detected in step S10, the adjusted water amount β is set to the upper limit value as in step S12, and the corrected target water level W0 is set so as not to make an excessive water amount adjustment.

  Furthermore, while all of the above are phenomena in which the fluctuating water level decreases, it can be assumed that the fluctuating water level W2 after the predetermined rest time is equivalent (or higher) to the initial predetermined water level W1. This is the pressure (water level) fluctuation characteristic when the inside of the water tank 2 shown in FIG. 1 (b) is not sealed, and shows the water supply control means in this case. In other words, if the overflow port 10a also communicates with the atmosphere and the pressure from the various combinations is easily released, the water level fluctuation line A2 based on the pressure sensor 14 rises linearly when the water supply is started, and the initial predetermined water level W1. Is detected.

  When the initial predetermined water level W1 is detected, the water supply valve 11 is turned OFF in the same manner as described above, and the water supply is stopped and paused for a predetermined time of 8 seconds. However, since the fluctuating water level W2 after this resting time has almost no fluctuation in pressure in the water tank 2, the water level fluctuation line B2 moves horizontally and is maintained at substantially the same water level (W2 = W1). This clarifies that the initial predetermined water level W1 detected by the pressure sensor 14 is detected without error from the actual water level. Therefore, in this case, there is no need to adjust the initially set target water level W0, and so-called no adjustment (the adjusted water amount β is zero).

  As described above, if the water level does not change and is equal in step S9 in FIG. 2 or rises in reverse, the adjusted water amount β is set in step S13 so as not to increase the wasteful water amount. After the determination of 0 (zero), water supply control is performed without correcting the initial target water level W0. It should be noted that the frequency of the fluctuation water level W2 rising after the predetermined pause time is low, but the phenomenon may be a case where the water pressure is supplied to the water tank 2 and the drum 5 after the pressure sensor 14 detects the initial predetermined water level W1. For example, while the water supply path such as the water supply pipe 12 including the detergent charging case 13 is long and tap water is used for other purposes until the initial predetermined water level W1 is detected, the water supply amount is small. This can occur when the water supply pressure has recovered after detection and a large amount of water has just started.

  And the above-mentioned water supply control means is performed in the same way even during water supply in the rinsing process, and can perform effective rinsing while preventing fabric pain due to insufficient water amount. Further, in the washing and rinsing process started under the original target water level W0, the water level is lowered as the laundry is agitated and the state of mixing with water becomes good (water level fluctuation line D1 in FIG. 1). ). This phenomenon is known to be caused by the water absorption of the laundry, and therefore water supply (hereinafter referred to as supplementary water) is performed to compensate for the lowering of the water level. Water supply is controlled based on W0. For this reason, there was a tendency that the amount of water was slightly insufficient even after supplementary water supply under conditions where the pressure was temporarily increased.

  However, in this embodiment, as shown in FIG. 1 (a), the washing water level W4 at that time is detected by the pressure sensor 14 in the middle of the easy washing process, and the detection result is lower than the initial target water level W0. Based on the above supplementary water, the target adjusted water amount is adjusted in the same manner as the adjusted water amount β that has been set as the corrected target water level W3 previously executed, and under the same water supply conditions. Water supply is controlled, and even if the water absorption of the laundry progresses, water supply is performed aiming at an appropriate target water level W0, which is the amount of water necessary for the original cleaning, and the cleaning effect after supplementary water supply is made good.

  On the other hand, even when the pressure fluctuation in FIG. 1 (b) is small, the water level drops as shown by the water level fluctuation line D2 (water level W4) as in the case of (b) above. It can be seen that the cause of the decrease phenomenon is based on the water absorption of the laundry. In this case, the supplementary water has an addition amount of 0 (zero) as the adjustment water amount β in the previous water supply stroke, so water supply control is performed based on the initial target water level W0, and thus the same cleaning performance as described above is achieved. I try to get it.

As described above, the present embodiment has the following effects.
At the time of water supply that is easy to wash, the initial predetermined water level W1 before reaching the preset target water level W0 is detected, and when this initial predetermined water level W1 is detected, the water supply operation is paused for a predetermined time and the fluctuation after the pause time The water level W2 is compared with the initial predetermined water level W1, and the target water level W0 can be adjusted based on the difference α which is the detection result, and a desired water supply amount can be obtained by subsequent re-watering. Therefore, when the airtightness of the water tank 2 tends to increase and the normal pressure tends to increase, the water level detected by the pressure sensor 14 is lower than the actually required water level. In the example, the target water level W0 is upwardly corrected in accordance with the water level difference α, and a so-called corrected target water level W3 is set, and the necessary amount of water can be secured by compensating for the deficiency by the subsequent re-watering. Therefore, the desired cleaning performance can be obtained with an appropriate amount of water supplied, and damage to the laundry can be suppressed.

On the other hand, if the fluctuating water level W2 after the downtime is equal to the initial predetermined water level W1 or rises in reverse, adding the water amount may result in an abnormally high water level setting. In this case, the adjusted water amount is determined to be 0 (zero), and the water supply control based on the initial target water level W0 is performed without adjustment.
The contradictory phenomena as described above can be considered when the water tank 2 is in a substantially sealed state, and conversely, when the pressure is relatively easy to escape out of the water tank 2, both of which provide an appropriate amount of water supply that suppresses excess and deficiency. It can be secured in the drum 5.

  However, assuming an abnormal case in which the decrease in the fluctuation water level W2 after a predetermined pause time is greatly detected beyond prediction, the upward correction with the adjustment water amount β equal to the abnormal difference α in such a case is The extremely high water level is set, and a large amount of water supply even temporarily causes a problem in safety. Therefore, in this embodiment, an upper limit value is set so that the adjusted water amount β is not set to an excessively high water level (for example, the overflow water level or higher), and even if the difference α is outside the preset range, The upper limit is set to a value lower than the adjusted water amount corresponding to this, so that an abnormally high water level can be prevented and safety can be secured. In this case, even if an upper limit value is set for the water level difference α, an abnormal water level setting can be prevented as described above.

  Furthermore, although the above phenomenon is mainly based on the fluctuation of the pressure in the water tank 2, in the process of easy washing, the water level is lowered due to water absorption by the laundry, so supplementary water is required. In this case, the water amount is adjusted in the same manner as the corrected target water level W3 and the adjusted water amount β set by the water supply control means in the previous water supply stroke. Therefore, the water is supplied based on the target water level W0 that is originally necessary under the same water supply conditions, and the cleaning effect after the supplementary water can be improved.

  The present invention is not limited to the embodiment described above and shown in the drawings. For example, the present invention is not limited to a drying function or a drum-type washing machine. This is common to washing machines equipped with a water tank in which pressure fluctuation during water supply is predicted In the specific configuration, the adjusted water amount is adjusted with a water level (water amount) equivalent to the difference, but this may be a water amount appropriately set according to the difference, for example, Various adjustments such as the possibility of setting the adjusted water amount by combining with the water supply stop time after detecting the initial predetermined water level are possible, and various changes can be made without departing from the scope of the present invention.

Action explanatory drawing of different states (A) and (B) by the water supply control means showing an embodiment of the present invention Flow chart of water supply control means Side view of the essential part showing the overall configuration of a drum-type washing machine with a drying function Block diagram showing electrical configuration

Explanation of symbols

In the drawings, 1 is a housing, 2 is a water tub, 5 is a drum (washing tub), 9 is a drain hose, 10 is an overflow hose, 10a is an overflow port, 11 is a water supply valve (water supply means), 14 is a pressure sensor, 20 Denotes control means (laundry amount detection means, water supply control means), and 22 denotes a water supply pipeline.

Claims (4)

In what comprises a control means for detecting the water level in the washing tub disposed in the water tub with a pressure sensor and controlling the water supply to the washing tub based on the water level detection signal,
During water supply, an initial predetermined water level before reaching a preset target water level is detected, and when this initial predetermined water level is detected, the water supply operation is paused for a predetermined time, and the water level after the pause time is lower than the initial predetermined water level When the detection result is obtained, the target water level is corrected upward according to the difference in water level.   The washing machine according to claim 1, wherein the target water level is not corrected when the water level after the downtime is a detection result equal to or higher than the initial predetermined water level.   2. The type washing machine according to claim 1, wherein an upper limit value is provided for upward correction of the target water level according to the water level difference. The washing machine according to claim 1, further comprising means for replenishing water when a drop in the water level during the washing process is detected, wherein the target water level of the supplemental water is the water level after correction at the time of water supply.

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