JPH0779902A - dishwasher - Google Patents

Abstract

(57) [Summary] [Purpose] In a dishwasher for washing dishes by spraying washing water on the dishes stored in the washing tank, the volume of water supplied is stabilized without affecting the flow rate of water supply, and capacity detection is performed. ,always,
Performs a series of operations according to the capacity of the tableware. [Structure] The water level sensor 7 detects the water level of the washing water in the washing tank 1 accommodating the dishes 2 to wash and rinse the dishes 2.
The control means 14 controls a series of sequential operations in the drying process. After the water supply valve 3 starts supplying water into the cleaning tank 1, the control means 14 measures the amount of change in the water level detected by the water level sensor 7 per unit time to calculate a correction value, and based on this correction value, the water supply valve 3 The predetermined detection frequency of the water level sensor 7 as a reference for stopping the operation of is added or subtracted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing dishes by spraying washing water on the dishes stored in a washing tank.

[0002]

2. Description of the Related Art In recent years, a dishwasher has been proposed which simply determines the capacity of the dishes placed in the dishwasher and controls the operating time more finely according to these.

Conventionally, this kind of dishwasher has been constructed as shown in FIG. The configuration will be described below.

As shown in the figure, the cleaning tank 1 stores dishes 2 inside and supplies cleaning water from a water supply valve (water supply means) 3 to store it at the bottom. The cleaning nozzle 4 is rotatably supported in the cleaning tank 1 and ejects cleaning water toward the tableware 2. The cleaning pump 5 sends cleaning water to the cleaning nozzle 4, and the cleaning pump 5 is driven by a motor 6. The water level sensor (water level detection means) 7 is the cleaning tank 1.
It detects the water level inside and outputs it as an electrical signal. The heater (heating means) 8 is arranged at the bottom of the cleaning tank 1 and heats the cleaning water. The thermistor (temperature detection means) 9 is attached to the bottom of the cleaning tank 1 so as to be in close contact with the outside, and detects the temperature of the cleaning water. The blower fan 10 sends out the steam in the cleaning tank 1, and is discharged from the machine through the exhaust port 11.
Reference numeral 12 is a tableware basket in which the tableware 2 is placed. The control means 13 controls a series of sequential operations of the washing, rinsing and drying steps of the tableware 2.

To explain the operation of the above configuration, when the user arranges the dishes 2 in the dish basket 12 and stores them in the washing tank 1 and puts the detergent into it and starts the operation, first, the washing tank 1
Tap water is supplied from the water supply valve 3 until the water level sensor 7 detects a predetermined water level at the bottom of the. Then, the motor 6 and the heater 8 are energized, and the washing water is jetted from the washing nozzle 4 toward the dishes 2 by the washing pump 5 while being heated. At this time, the temperature of the wash water is detected by the thermistor 9, and the control means 13 always grasps the temperature of the wash water.
When the temperature of the cleaning water reaches a predetermined temperature and a predetermined time elapses from the start of cleaning, the control means 13 ends the cleaning process and once drains the cleaning water.

Next, tap water is newly supplied, and the same operation as the above-described cleaning step is performed for several minutes to drain the water. After repeating this rinsing step several times, the same operation as the washing step called a heat rinsing step is performed, and when the predetermined temperature is reached, the operation is terminated and drained. Finally, the blower fan 10 is operated to discharge the steam in the cleaning tank 1 to the outside of the machine, and at the same time,
The heater 8 is intermittently energized to heat the tableware 2 and dry the attached water droplets.

In the above-mentioned successive series of operations, the capacity of the tableware 2 is detected by examining the degree of temperature rise of the washing water in the washing process, and the operating time of each of the washing, rinsing and drying steps is changed according to the degree. .

That is, when the cleaning process is started, FIG.
In the water supply process of step 38, a predetermined amount of tap water is supplied to the bottom of the cleaning tank 1, heating of the cleaning water by the heater 8 is started in step 39, and the cleaning water is heated by the thermistor 9 in step 40. When it is confirmed that the temperature has reached the predetermined temperature T1, the measurement of the cleaning water temperature rise time dt is started in step 41, and when it is judged by the thermistor 9 that the cleaning water has reached the predetermined temperature T2 in step 42, step 43
The measurement of the washing water temperature rise time dt is completed at, and the time dt required for the temperature of the washing water to rise from T1 to T2
You can know.

That is, when the input value of the heater 8 is constant,
The smaller the capacity of the tableware 2 is, the smaller the heat capacity is, and as shown in FIG. 10, the temperature rise of the wash water becomes faster. In general, when the tableware 2 has a small capacity, the wash water ejected from the cleaning nozzle 4 often hits the tableware 2, so that the tableware 2 can be washed well. The same is true for drying, and if the tableware 2 has a small capacity, constant washing performance and drying performance can be obtained even if the operating time is shortened.
It saves energy and saves time.

[0010]

In such a conventional dishwasher, the water level sensor 7 generally converts pressure into an electric signal as means for detecting the water level. Normally, when the water level (water supply amount) of the cleaning tank 1 is determined using these water level sensors 7, the water level sensor 7 is operated while the water supply valve 3 is in operation.
When a certain frequency is detected, the control means 13 generally outputs a signal for stopping the operation of the water supply valve 3. However, the supply flow rate of the tap water supplied from the water supply valve 3 varies from 2 liters to 8 liters per minute depending on the household, although the water pressure is suppressed by the water supply valve 3. .

Conventionally, the detection frequency of the water level sensor 7 is constant regardless of the water supply flow rate. Therefore, if the water level is adjusted to 4 liters / minute, for example, in a household with a water supply flow rate of 8 liters / minute, Even if the water level sensor 7 detects a predetermined frequency and immediately stops the water supply valve 3, the tap water that has left the water supply valve 3 is supplied to the cleaning tank 1, so the amount of water is slightly larger. I will enter. On the contrary, in a household with a water supply flow rate of 2 liters / minute, it will be slightly lower.

As a result, as shown in FIG. 11, the difference Δdt1 or Δdt2 between the temperature rise time of the wash water in the standard state and the temperature rise time of the wash water due to the actual heating by the heater 8 is large. In addition, in many cases, the difference in the temperature rise time due to the difference in capacity of the tableware 2 in the standard state is affected, which is an error factor in determining the amount of tableware.

The present invention solves the above-mentioned problems, and improves the detection accuracy of the volume of tableware without being affected by variations in the flow rate of flowing water, and always performs a series of operations suitable for the volume of tableware. Is the first purpose.

Further, even when there is a large variation in the amount of change in the water level detected by the water level sensor per unit time, the water supply should always be stably supplied to perform a series of operations suitable for the capacity of the tableware. Is the second purpose.

Further, even when the amount of change in the water level detected by the water level sensor per unit time is significantly different from that in the standard state, the water supply amount is always stably supplied, and The third purpose is to operate.

Further, even when the flow rate change per unit time of the water level detected by the water level sensor suddenly fluctuates due to external factors such as noise, the water supply amount is always stably supplied to the tableware capacity. The fourth purpose is to perform a series of operations that exist.

[0017]

In order to achieve the first object, the present invention provides a cleaning tank for storing dishes, a water supply means for supplying water to the cleaning tank, and a cleaning water in the cleaning tank for dishes. A cleaning nozzle for ejecting the cleaning water into the cleaning tank, a cleaning pump for feeding the cleaning water in the cleaning tank to the cleaning nozzle, a motor for driving the cleaning pump, and a heating means for heating the cleaning water,
A temperature detecting means for detecting the temperature of the washing water in the washing tank, a water level detecting means for detecting the water level of the washing water in the washing tank, and a series of sequential operations for washing, rinsing and drying dishes. Comprising a control means, the control means calculates a correction value by measuring the amount of change per unit time of the water level detected by the water level detection means after starting the water supply into the cleaning tank by the water supply means, The first problem solving means is to adjust the predetermined detection frequency of the water level detecting means as a reference for stopping the operation of the water supplying means in accordance with the correction value.

Further, in order to achieve the second object, in addition to the first problem solving means, a storage means for storing a correction value calculated from a change amount of the water level detected by the water level detection means per unit time. And the control means sets the average value of the correction values obtained in the past by the storage means as a true correction value,
A second problem solving means is that the predetermined detection frequency of the water level detecting means, which is a reference for stopping the operation of the water supplying means, is adjusted according to the correction value.

Further, in order to achieve the third object, in addition to the first problem solving means, a storage means for storing a correction value calculated from a change amount of the water level detected by the water level detection means per unit time. When the absolute value of the difference between the calculated correction value and the average value of the correction values stored in the storage means exceeds a predetermined range set in advance, the control means stores it in the storage means in advance. A third problem solving means is that the average value of the correction values obtained in the past is used to adjust the predetermined detection frequency of the water level detection means as a reference for stopping the operation of the water supply means.

Further, in order to achieve the fourth object, in addition to the first problem solving means, a storage means for storing a correction value calculated from a change amount of the water level detected by the water level detection means per unit time. When the absolute value of the difference between the calculated correction value and the average value of the correction values stored in the storage means exceeds a preset predetermined range, the control means uniquely operates the water supply means. The fourth problem solving means is to determine the predetermined detection frequency of the water level detection means as a reference for stopping.

[0021]

According to the first means for solving the above problems, the present invention provides:
When knowing the amount of change per unit time by the water level detection means at the time of water supply, compare with the water supply flow rate in the standard state from this, and adjust the predetermined detection frequency of the water level detection means as the reference to stop the operation of the water supply means. As a result, the amount of water supplied to the washing tank can be made constant, so that the temperature rise of the washing water is stable and the amount of dishes can be accurately determined.

Further, by the second means for solving the problem, the amount of change per unit time by the water level detecting means at the time of water supply is known,
From this, compare with the water supply flow rate in the standard state,
A reference for stopping the operation of the water supply means using the frequency difference obtained by adding or subtracting the predetermined detection frequency of the water level detection means, averaging the latest frequency difference for a predetermined number of times, and storing it in the storage means. To the predetermined detection frequency of the water level detection means. As a result, the amount of water supplied to the washing tank can be made constant, so that the temperature rise of the washing water is stabilized and the amount of dishes can be determined more accurately.

Further, by the third means for solving the problems, the amount of change per unit time by the water level detecting means at the time of water supply is known,
From this, compare with the water supply flow rate in the standard state,
If a frequency difference for adding or subtracting the predetermined detection frequency of the water level detection means is obtained, and if this frequency difference exceeds a preset predetermined range, then the previously obtained frequency difference stored in the storage means is used. The frequency difference is adjusted to a predetermined detection frequency of the water level detection means, which is a reference for stopping the operation of the water supply means. As a result, the amount of water supplied to the washing tank can be made constant, so that the temperature rise of the washing water is stable and the amount of dishes can be determined more accurately.

Further, by the fourth means for solving the problem, the amount of change per unit time by the water level detecting means at the time of water supply is known, and from this, a comparison is made with the water supply flow rate in the standard state, and the predetermined detection frequency of the water level detecting means is adjusted. If the frequency difference varies greatly beyond a preset predetermined range, the water supply flow rate cannot be estimated. Therefore, the water level detecting means serving as a reference for uniquely stopping the operation of the water supply means The capacity of the tableware can be appropriately determined by determining the predetermined detection frequency of.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the control means 14 controls a series of sequential operations of washing, rinsing, and drying processes of the tableware 2, and after the water supply valve (water supply means) 3 starts to supply water into the cleaning tank 1. , A predetermined value of the water level sensor 7 as a reference for measuring the amount of change in the water level detected by the water level sensor (water level detection means) 7 per unit time and calculating a correction value, and stopping the operation of the water supply valve 3 by this correction value. The detection frequency is adjusted. .

Although the water level sensor 7 is not shown, a magnetic body is attached to a diaphragm that responds to pressure, and the magnetic body is placed in opposition to the coil to increase the inductance of the coil due to the pressure applied from the outside. This coil is connected to an oscillator circuit. This oscillation circuit has a circuit configuration in which the oscillation frequency decreases as the pressure applied to the water level sensor 7 increases.

Next, the locus of the time and the water level detection frequency of the water level sensor 7 in the standard state will be described with reference to FIG. When the water in the cleaning tank 1 is empty, the water level detection frequency is a high frequency f0, but when water is supplied into the cleaning tank 1 during the water supply process, the water level detection frequency decreases as the water level rises. I will do it. Now, assuming that the cleaning water level detection cycle number for obtaining the predetermined water level for cleaning is f3, the relationship between the time until the water level sensor 7 detects f3 and the water level detection frequency is as shown by the solid line B in FIG.

Here, the characteristic of the water level detection frequency with respect to the time axis is bent midway, but this is due to the influence of the structure of the cleaning tank 1. When the water supply flow rate per hour is constant, the bottom of the cleaning tank 1 has a small volume, so that the frequency changes rapidly with time, and since the volume increases from the middle, the frequency change becomes slow and the curve changes. It ends up.

Now, when the water supply flow rate is 8 liters / minute, the time for supplying water into the cleaning tank 1 is fast, and the change in the water level detection frequency with respect to the time axis until the cleaning water level detection frequency f3 is detected is shown in FIG. The locus A is shown by a broken line. Conversely,
When the water supply flow rate is 2 liters / minute, the locus C is obtained.
Here, focusing on the change in the water level detection frequency with respect to the time axis at the bottom of the cleaning tank 1, the time required for the frequency change between the predetermined frequencies f1 and f2 is the time difference of t1, t1 ', and t1 "due to the difference in the feed water flow rate. Although the relationship between the time difference and the water supply flow rate changes linearly although not shown, the water supply flow rate can be estimated by measuring these time differences.

Next, the operation will be described with reference to FIG. When the water supply process starts and water supply to the cleaning tank 1 is started, the water level detection frequency starts decreasing as the water level rises. When the predetermined water level detection frequency f1 is detected in step 21, the process proceeds to step 22 and the timer measurement is started. Further, the water supply continues, and when the predetermined water level detection frequency f2 is detected in step 23, the process proceeds to step 24, and the timer measurement time dt1, that is, the time required for the frequency change of f1-f2 is detected.

In step 25, the water supply flow rate is estimated based on the length of time dt1 and the correction frequency (correction value) is calculated using a table (not shown) prepared beforehand or a calculation formula (not shown). Calculate df3. In step 26, the cleaning water level detection frequency f3 is adjusted, and the corrected cleaning water level detection frequency is set to F3. Next, in step 27, by detecting the cleaning water level detection frequency F3 after the correction, it is possible to accurately supply the water supply amount according to the water supply flow rate.

At present, a water hammer caused by suddenly stopping the water supply valve 3 has become a problem, and an oil damper type water supply valve has been developed which allows the water supply valve 3 to be stopped slowly. It is expected that the difference in the water supply flow rate will affect the water supply valve that operates slowly as a difference in the water supply amount, so that a considerable effect can be obtained.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the storage means 15 stores the correction value obtained from the amount of change in the water level detected by the water level sensor 7 per unit time. The control means 16 sets the average value of the correction values obtained in the past by the storage means 15 as a true correction value, and the predetermined detection frequency of the water level sensor 7 as a reference for stopping the operation of the water supply valve 3 corresponding to this correction value. Is adjusted.

The operation of the above configuration will be described with reference to FIG. Since steps 21 to 25 are the same as the operation of the first embodiment, the description thereof will be omitted.

After the correction value df3 is calculated in step 25, the process proceeds to step 28, and the average value of the correction values df3 calculated during the past operation is stored in the storage means 15 and is substituted for df3ave. This average is the latest n
Since the average value of the individual pieces of data (n is an integer) is used, in step 29, the average value is calculated by adding the correction value df3 newly measured this time, and is substituted again as the correction value df3ave. Next, in step 30, the correction value d
f3ave is stored in the storage means 15 as a new correction value. Next, in step 31, the cleaning water level detection frequency f
Adjust to 3 and make the corrected cleaning water level detection frequency F3.
Next, the routine proceeds to step 32, where the corrected cleaning water level detection frequency F3 is detected, so that the amount of water supply can be accurately supplied according to the water supply flow rate. By these operations, since the latest n average values are always taken, the water level detection accuracy is improved, and the dish quantity determination can be made more accurate.

Next, a third embodiment of the present invention will be described. If the absolute value of the difference between the calculated correction value and the average value of the correction values stored in the storage means exceeds a preset predetermined range, the control means 16 in FIG. The predetermined detection frequency of the water level sensor 7, which is a reference for stopping the operation of the water supply valve 3, is adjusted by using the average value of the correction values obtained in the past. The other structure is the same as that of the second embodiment.

The operation of the above configuration will be described with reference to FIG. Since steps 21 to 25 and steps 28 to 32 are the same as the operation of the second embodiment, the description thereof will be omitted.

The water supply flow rate is determined by the water pressure,
In particular, when water is supplied to another device while the water is being supplied to the dishwasher due to the low water pressure of the household or the capacity of the hot water supply facility, the water supply flow rate of the dishwasher may be reduced. As a result, the original feed water flow rate cannot be detected, and the corrected cleaning water level detection frequency F3 also has low accuracy. In order to consider such disturbance factors, it is necessary to judge whether or not it is within a predetermined fluctuation range.

The absolute value of the difference between the correction value df3 obtained by the current measurement in step 33 of FIG. 6 and the average value df3ave of the correction values calculated during the past driving is taken, and this value is within the predetermined value h. Determine whether or not. This correction value df3
Is within the predetermined value h, the process proceeds to step 29, and the second
Similarly to the embodiment of FIG.
The average value with f3 added is calculated, and the corrected value df3ave is substituted again. However, if the value is out of the predetermined value, it is determined that there is some disturbance factor, and the process proceeds to step 34. Instead of using the correction value df3 newly measured this time, the average value df3ave of the correction values stored up to the previous time is set as the true correction value. As step 35
Then, the cleaning water level detection frequency f3 is adjusted, and the corrected cleaning water level detection frequency is set to F3.

Next, a fourth embodiment of the present invention will be described. When the absolute value of the difference between the calculated correction value and the average value of the correction values stored in the storage means 15 exceeds the predetermined range set in advance, the control means 16 of FIG. The predetermined detection frequency of the water level sensor 7 which serves as a reference for stopping the operation is determined. The other structure is the same as that of the second embodiment.

The operation of the above configuration will be described with reference to FIG. Since steps 21 to 25 and steps 28 to 32 are the same as the operation of the second embodiment, the description thereof will be omitted.

The water supply to the other equipment and water supply are performed during the water supply of the dishwasher by the household with low water pressure or the capacity of the hot water supply equipment, and the fluctuation range of the decrease in the water supply flow rate of the dishwasher is significantly larger than usual. If, or if it is usually large, or if the amount of change in the water level detected by the water level sensor 7 per unit time changes rapidly due to an external factor of noise, it is determined that the water supply flow rate cannot be measured, and Step 3
From 6 to step 37, it is possible to uniquely determine that the water supply flow rate is small, set the wash water level detection frequency F3 to the safe side, and appropriately determine the dish amount.

[0045]

As is apparent from the embodiments described above, according to the present invention, the washing tank for storing the dishes, the water supply means for supplying water to the washing tank, and the washing water in the washing tank are directed to the dishes. And a cleaning nozzle for ejecting the cleaning water in the cleaning tank to the cleaning nozzle, a motor for driving the cleaning pump, a heating unit for heating the cleaning water, and a temperature of the cleaning water in the cleaning tank. A temperature detecting means for detecting the water level, a water level detecting means for detecting the water level of the washing water in the washing tank, and a control means for controlling a series of sequential operations of washing, rinsing and drying the dishes, and the control means After the start of water supply to the cleaning tank by the water supply means, a correction value is calculated by measuring the amount of change in the water level detected by the water level detection means per unit time, and the water supply means corresponding to this correction value. The standard for stopping the operation of Since the predetermined detection frequency of the water level detection means is adjusted, it is possible to detect the capacity of tableware without being affected by the fluctuation of the water supply flow rate by the current water level detection method and the effect of the water supply flow rate by the future oil damper method. The accuracy can be improved, and a series of operations suitable for the capacity of the tableware can always be performed.

Further, the storage means stores a correction value calculated from the amount of change in the water level detected by the water level detection means per unit time, and the control means stores the average value of the correction values obtained in the past by the storage means. Since it is a true correction value, and the predetermined detection frequency of the water level detection means serving as a reference for stopping the operation of the water supply means is adjusted according to this correction value,
Even if there is a large variation in the water supply flow rate due to the current water level detection method, the water supply amount can always be stably supplied to improve the accuracy of detecting the capacity of tableware, and a series of operations suitable for the capacity of tableware can be performed. it can.

Further, the storage unit stores the correction value calculated from the amount of change in the water level detected by the water level detection unit per unit time, and the control unit stores the correction value obtained and the correction stored in the storage unit. When the absolute value of the difference between the average value and the average value exceeds a preset predetermined range, the operation of the water supply means is stopped by using the average value of the correction values obtained in the past and stored in the storage means in the past. Since the predetermined detection frequency of the water level detection means used as the reference is adjusted, even if the variation in the water supply flow rate due to the water level detection method is significantly different from that of the standard in households with low water pressure, the water supply amount can be stabilized. It can be supplied and can perform a series of operations according to the capacity of the tableware.

Further, the storage unit stores a correction value calculated from the amount of change in the water level detected by the water level detection unit per unit time, and the control unit stores the correction value thus obtained and the correction stored in the storage unit. When the absolute value of the difference between the average value and the average value exceeds a preset predetermined range, the predetermined detection frequency of the water level detection means, which is the reference to stop the operation of the water supply means, is uniquely determined. Even if there is an external factor such as a lower household or noise,
The water supply can be stably supplied, and a series of operations suitable for the capacity of the tableware can be performed.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a dishwasher according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a locus of the water level detection frequency with respect to time of the water level detection means of the dishwasher.

FIG. 3 is a flowchart showing a process of calculating a water level detection correction frequency of the dishwasher.

FIG. 4 is a system configuration diagram of a dishwasher according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing a process of calculating a water level detection correction frequency of the dishwasher.

FIG. 6 is a flowchart showing a process of calculating a water level detection correction frequency in the dishwasher according to the third embodiment of the present invention.

FIG. 7 is a flowchart showing a process of calculating a water level detection correction frequency in the dishwasher according to the fourth embodiment of the present invention.

FIG. 8: System configuration diagram of a conventional dishwasher

FIG. 9 is a flowchart showing a process of determining the dish capacity of the dish washing machine.

FIG. 10 is a diagram showing a relationship between a temperature rise of washing water of the dishwasher and a dish capacity.

FIG. 11 is a diagram showing the relationship between the amount of wash water and the temperature rise time of the dishwasher.

[Explanation of symbols]

 1 Cleaning Tank 2 Tableware 3 Water Supply Valve (Water Supply Means) 4 Cleaning Nozzle 5 Cleaning Pump 6 Motor 7 Water Level Sensor (Water Level Detection Means) 8 Heater (Heating Means) 9 Thermistor (Temperature Detection Means) 14 Control Means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Komatsu 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A cleaning tank for storing dishes, a water supply means for supplying water to the cleaning tank, a cleaning nozzle for ejecting the cleaning water in the cleaning tank toward the dishes, and a cleaning water in the cleaning tank. A cleaning pump for feeding to the cleaning nozzle, a motor for driving the cleaning pump, a heating means for heating the cleaning water, a temperature detecting means for detecting the temperature of the cleaning water in the cleaning tank, and a cleaning water in the cleaning tank. Water level detection means for detecting the water level, and washing, rinsing of dishes, and control means for controlling a series of sequential operations of the drying process, the control means, after the start of water supply into the cleaning tank by the water supply means, A correction value is calculated by measuring the amount of change in the water level detected by the water level detection unit per unit time, and a predetermined detection frequency of the water level detection unit serving as a reference for stopping the operation of the water supply unit corresponding to this correction value. To adjust Dishwasher. 2. A storage means for storing a correction value calculated from a change amount of the water level detected by the water level detection means per unit time, and the control means stores the average value of the correction values obtained in the past by the storage means. The dishwasher according to claim 1, wherein a true correction value is set, and a predetermined detection frequency of the water level detection means, which is a reference for stopping the operation of the water supply means, is adjusted according to the correction value. 3. A storage means for storing a correction value calculated from the amount of change in the water level detected by the water level detection means per unit time, and the control means stores the correction value obtained and the correction stored in the storage means. When the absolute value of the difference between the average value and the average value exceeds the preset predetermined range, the average value of the correction values obtained in the past and stored in the storage means in advance is used,
The dishwasher according to claim 1, wherein a predetermined detection frequency of the water level detection means, which is a reference for stopping the operation of the water supply means, is adjusted. 4. A storage means for storing a correction value calculated from a change amount of the water level detected by the water level detection means per unit time, and the control means stores the calculated correction value and the correction stored in the storage means. The predetermined detection frequency of the water level detection means as a reference for uniquely stopping the operation of the water supply means is determined when the absolute value of the difference from the average value exceeds a predetermined predetermined range. The listed dishwasher.