JPH06311955A - Tableware washing machine - Google Patents

Abstract

PURPOSE:To improve the detection accuracy of the capacity of tableware, etc., and to always execute a series of operations conforming to the capacity of tableware, etc. CONSTITUTION:A water level of washing water in a washing tank 1 for containing tableware, etc., 2 is detected by a water level sensor 6 and while detecting a water temperature by a thermistor 8, it is heated by a heater 7, and a series of sequential operations of washing, rinsing and drying processes of the tableware, etc., 2 are controlled by a control means 14. This machine is provided with an arithmetic means 13 for deriving a water level difference of a first prescribed water level derived from a variation per a unit time of the water level detected by the water level sensor 6 and a second prescribed water level in a standard state, and the control means 14 adds or subtracts a correction time value corresponding to the water level difference derived by the arithmetic means 13 to or from a temperature rise time in a prescribed temperature section detected by the thermistor 8, and by this corrected temperture rise time, the quantity of tableware is decided.

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 in which the capacity of the dish put in the dishwasher is simply determined and the operating time is controlled more finely according to the determination.

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

As shown in the figure, a cleaning tank 1 stores dishes 2 inside and stores cleaning water at the bottom. Cleaning nozzle 3
Is rotatably supported in the washing tank 1 and spouts washing water toward the tableware 2. The washing pump 4 sends the washing water to the washing nozzle 3, and the washing pump 4 uses a motor 5
Driven by. The water level sensor 6 detects the water level in the cleaning tank 1 and outputs it as an electric signal. The heater 7 is arranged at the bottom of the cleaning tank 1 and heats cleaning water. The thermistor (temperature detection means) 8 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 9 sends out the steam in the cleaning tank 1 and is discharged from the exhaust port 10 to the outside of the machine. In addition, 11 is a tableware basket in which the tableware 2 is placed. The control means 12 is a tableware 2
Controls a series of sequential operations of the washing, rinsing and drying steps of.

To explain the operation of the above configuration, when the user places the dishes 2 in the dish basket 11 and stores them in the washing tub 1 and puts the detergent and then starts the operation, first, the washing tub 1
A predetermined amount of tap water is supplied to the bottom of the tank until the water level sensor 6 detects a predetermined water level. Then, the motor 5 and the heater 7 are energized and the cleaning water is heated while the cleaning pump 4 is being heated.
Is ejected from the cleaning nozzle 3 toward the tableware 2.
At this time, the temperature of the wash water is detected by the thermistor 8, and the control means 12 always grasps the temperature of the wash water. When the temperature of the cleaning water reaches a predetermined temperature and a predetermined time has elapsed from the start of cleaning, the control means 12 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 this rinsing step is repeated 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 finished and drained. Finally, the blower fan 9 is operated to discharge the steam in the cleaning tank 1 to the outside of the machine, and at the same time, the heater 7 is intermittently energized to heat the tableware 2 and dry the attached water droplets.

In the above-mentioned successive series of operations, the degree of temperature rise of the washing water in the washing step is checked to detect the capacity of the tableware 2, and the operating time of each step of washing, rinsing and drying is changed according to the degree. . That is, when the input value of the heater 7 is constant, if the capacity of the tableware 2 is small, the heat capacity becomes smaller, and the temperature rise of the wash water becomes faster as shown in FIG. That is, when the cleaning process is started, FIG.
A predetermined amount of tap water is supplied to the bottom portion of the cleaning tank 1 in the water supply process of step 21, the heating water is started to be heated by the heater 7 in step 22, and the cleaning water is predetermined in the thermistor 8 in step 23. When it is confirmed that the temperature has reached T1, the measurement of the washing water temperature rise time is started in step 24, and when it is determined by the thermistor 8 that the washing water has reached the predetermined temperature T2 in step 25, in step 26. It is possible to know the time dt required for the temperature of the wash water to rise from T1 to T2 after the measurement of the wash water temperature rise time is completed. That is, when the input value of the heater 7 is constant and the tableware capacity is small, the heat capacity is reduced accordingly.
As shown in 0, the temperature rise of the wash water becomes faster. In step 27, the capacity of the tableware 2 is determined based on this time dt.

In general, when the tableware 2 has a small capacity, the washing water ejected from the washing nozzle 3 often hits the tableware 2, so that the dishes can be washed well. The same applies to drying, and conversely, if the operating time is shortened by that amount, a constant cleaning performance and drying performance can always be obtained regardless of the tableware capacity, and at the same time energy saving and time saving can be achieved.

[0008]

In such a conventional dishwasher, the water level sensor 6 generally converts pressure into an electric signal as a means for detecting the water level. In such a water level sensor 6, However, there are problems such as large variations in the detected water level and being easily affected by temperature, and it is not possible to supply a predetermined amount of water into the cleaning tank.
In Example 2, when the amount of water supplied is smaller than the predetermined amount of water supplied in the standard state and when the amount of water supplied is larger than that of the standard state, the cleaning water in the standard state is compared with the temperature rise time of the cleaning water due to actual heater heating The difference Δdt1 or Δdt2 from the temperature rise time dth is large and often larger than the difference in temperature rise time due to the capacity difference of the tableware 2 in the standard state, which is a large error factor when determining the amount of tableware. However, there is a problem that the capacity of the tableware 2 cannot be accurately determined.

The present invention is to solve the above-mentioned problems, and is not affected by variations in the amount of water supplied in the washing tank due to variations in the water level detected by the water level sensor, improves the accuracy of detecting the volume of tableware, and constantly improves tableware. The first purpose is to make a series of operations suitable for the capacity of the.

Further, the capacity of the tableware is stably detected even when the water level is rapidly changed during water supply under various usage conditions, and a series of operations consistent with the capacity of the tableware is always performed. The second purpose is to do so.

Further, even if the detection variation of the water level sensor is large and the numerical values obtained from the variation of the detected water level per unit time exceeds the preset range in comparison with that of the standard state, it is stable. A third object is to detect the capacity of the tableware and to always perform a series of operations matching the capacity of the tableware.

Further, when the numerical values obtained from the amount of change in the water level detected by the water level sensor per unit time greatly exceed the preset range compared with that in the standard state due to factors such as noise and momentary power failure. In the above, the fourth purpose is to appropriately determine the capacity of the tableware.

[0013]

In order to achieve the first object, the present invention provides a washing tank for storing dishes, a washing nozzle for ejecting washing water toward the dishes, and the washing tank. A cleaning pump that feeds the cleaning water accumulated in the cleaning nozzle to the cleaning nozzle, a motor that drives the cleaning pump, a heater that heats the cleaning water, a temperature detecting unit that detects the temperature of the cleaning water, and a cleaning unit in the cleaning tank. A water level sensor for detecting the water level of wash water, a control means for controlling a series of sequential operations of washing, rinsing, and drying steps of the tableware, and a change amount of the water level detected by the water level sensor after the start of water supply per unit time And a calculation means for calculating a water level difference between the first predetermined water level obtained from the above and the second predetermined water level in the standard state, wherein the control means sets the correction time value corresponding to the water level difference obtained by the calculation means. Temperature detection It was subtracted from the temperature rise time at a predetermined temperature zone for detecting the stage, and that it has to determine the dishes amount as the first means for solving problems due to the temperature rise time of the corrected.

In order to achieve the second object, in addition to the above-mentioned first problem solving means, a storage means for storing the water level difference calculated by the calculation means is provided, and the control means is The average value of the water level difference with a high degree of detection or the water level difference obtained in the past is taken as the true water level difference, and the correction time value corresponding to this water level difference is added to or subtracted from the temperature rise time in the predetermined temperature section detected by the temperature detection means. The second problem solving means is to determine the amount of tableware based on the corrected temperature rise time.

In order to achieve the third object, in addition to the above-mentioned first problem solving means, a storage means for storing the water level difference calculated by the calculation means is provided, and the control means is calculated by the calculation means. When the water level difference exceeds a predetermined range set in advance, a predetermined time for detecting a correction time value corresponding to this water level difference by using the previously obtained water level difference previously stored in the storage means is detected by the temperature detection means. A third problem solving means is to adjust the temperature rise time in the temperature section and determine the dish amount based on the corrected temperature rise time.

Further, in order to achieve the fourth object, the control means of the first problem solving means uniquely determines the amount of tableware when the water level difference obtained by the arithmetic means exceeds a preset predetermined range. Making the decision is the fourth means for solving the problem.

[0017]

According to the first means for solving the above problems, the present invention provides:
The amount of change in the water level per unit time is known by the water level sensor at the time of water supply, and from the water level difference between the first predetermined water level and the second predetermined water level in the standard state obtained from this, the water actually supplied into the cleaning tank It is possible to know the water amount difference between the water amount and the predetermined water supply amount in the standard state. A correction time value corresponding to the water level difference or the water amount difference is obtained, and the time required for actually heating the cleaning water with the heater and increasing the temperature in the predetermined temperature section is added or subtracted. The temperature rise time after correction obtained by this can be treated in the same way as the value of the temperature rise time measured in the standard state,
This can be used to determine a more accurate tableware amount.

Further, by the second means for solving the problem, the amount of change of the water level per unit time is known by the water level sensor, and the difference between the first predetermined water level and the second predetermined water level in the standard state obtained from this is calculated. It is stored in the storage means at predetermined time intervals, and by using this, the water level difference with the highest degree of detection in the past or the average value of the water level differences obtained in the past is taken as the true water level difference, and the correction corresponding to this water level difference is made. The time value is actually added to or subtracted from the time required for heating the cleaning water with the heater and raising the temperature in the predetermined temperature section. Since the corrected temperature rise time obtained in this way can be treated in the same manner as the value of the temperature rise time measured in the standard state, it is possible to determine a more accurate tableware amount using this.

Further, by the third means for solving the problem, the amount of change in the water level per unit time is known by the water level sensor, and the difference in water level between the first predetermined water level and the second predetermined water level in the standard state obtained from this is obtained. , The numerical values used when obtaining the water level difference are stored in the storage means at predetermined time intervals, and even if these water level differences or various numerical values exceed a preset predetermined range, they are stored in advance. The current water level difference can be obtained by using the previously set water level difference and various numerical values, and the correction time value corresponding to this water level difference is required to actually heat the cleaning water with the heater and raise the temperature in the predetermined temperature range. Add or subtract time. The corrected temperature rise time thus obtained can be treated in the same manner as the value of the temperature rise time measured in the standard state, and a more accurate tableware amount can be determined using this.

Further, by the fourth means for solving the problem, the amount of change of the water level per unit time is known by the water level sensor, and the first predetermined water level obtained by this and the second in the standard state are obtained.
The water level difference from the specified water level and the various values used when calculating this water level greatly exceed the preset specified range, and the time required to raise the temperature in the specified temperature range by heating the actual cleaning water with the heater When it is not possible to correct, the capacity of the tableware can be appropriately determined by uniquely determining the tableware amount.

[0021]

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 of the above-mentioned conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, after the water supply to the cleaning tank 1 is started, the calculating means 13 has a first predetermined water level obtained from the amount of change in the water level detected by the water level sensor 6 per unit time, and the first predetermined water level in the standard state. The water level difference from the predetermined water level of 2 is calculated.
The control unit 14 adjusts the correction time value corresponding to the water level difference calculated by the calculation unit 13 to the temperature rise time in the predetermined temperature section detected by the thermistor (temperature detection unit) 8, and the table temperature is adjusted by the corrected temperature rise time. I try to judge the quantity. The water level sensor 6 is not shown,
A magnetic body is attached to a diaphragm that responds to pressure, and this magnetic body is placed opposite to the coil so that the inductance of the coil is reduced by the pressure applied from the outside.
This coil is connected to an oscillator circuit. Therefore, when the pressure applied to the water level sensor 6 increases, the oscillation frequency decreases. On the other hand, the cleaning tank 1 is provided with a recess 1a at the bottom, and when the water supply amount is constant, the pressure applied to the water level sensor 6 changes with time when the water level of the cleaning water reaches the upper end surface of the recess 1a. Will be less. Therefore, the oscillation frequency of the water level sensor 6, that is, the water level detection frequency rapidly changes when passing through the upper end surface of the recess 1a as shown by the solid line in FIG. Here, the water level detection frequency fluctuates as indicated by the broken line due to the detection variation of the water level sensor 6.

According to the present invention, in a standard state, that is, in a state where there is no detection variation, a predetermined predetermined water level (water level detection frequency fo) at the inflection point obtained from the amount of change in the water level per unit time is used as a reference. The water level difference (water level detection frequency difference Δfx) from the first predetermined water level (water level detection frequency fx) at the inflection point obtained from the amount of change in the water level detected by the water level sensor 6 per unit time is calculated and washed. Tank 1
The amount of water inside is detected, the temperature rise time of the wash water is corrected,
The capacity of the tableware 2 is determined.

The operation of the above configuration will be described. The series of sequential operations of the washing, rinsing, and drying steps of the tableware 2 by the control means 14 are the same as in the conventional example, and therefore the description thereof is omitted, and the water supply in the washing tank 1 due to the variation in the water level detected by the water level sensor 6 The temperature rise time correction with respect to the amount variation will be described.

When the water supply process is started in step 21 of FIG. 3, it is detected in step 31 of FIG. 4 that the water level detection frequency detected by the water level sensor 6 has reached f1, and in step 32, the water supply from the start of water supply is started. The elapsed time tn1 is detected.
When (tn1 + 2 seconds) has elapsed from the start of water supply in step 33, the water level detection frequency f2 is detected in step 34. Similarly, in step 35, it is detected that the water level detection frequency detected by the water level sensor 6 has become f3, and step 3
At 6, the elapsed time tn3 from the start of water supply is detected. When (tn3 + 8 seconds) has elapsed from the start of water supply in step 37, the water level detection frequency f4 is detected in step 38.
Next, in step 39, the water level detection frequency fx of the first predetermined water level is calculated using (Equation 1).

[0026]

[Equation 1]

However, fa = f1-f2 and fb = f3-f4. Next, in step 40, the difference Δfx between the water level detection frequency fo at the second predetermined water level and the water level detection frequency fx at the first predetermined water level in the standard state is calculated by the following equation. Δfx = fo−fx Then, in step 41, the frequency difference Δfx is calculated by the following equation.
The temperature rise correction time Δdt corresponding to is calculated. Δdt = a × Δfx + b where a and b are constants. When the water is supplied to the predetermined water level in step 42, the water supply process is terminated, and the temperature of the cleaning water is actually changed to T by steps 22 to 26 in FIG.
The time dt required to rise from 1 to T2 is measured, and the corrected temperature rise time dt 'is calculated by adding / subtracting the correction time value Δdt to the actual cleaning water temperature rise time dt in step 27. . Temperature rise time dt 'after this correction
Can be treated in the same manner as the temperature rise time dth due to heating of the wash water by the heater in the standard state, so that the step is not affected by the variation in the amount of water supplied in the wash tank due to the variation in the detection of the water level sensor 6. At 28, the capacity of the tableware can be determined with a uniform reference.

In the above embodiment, the timing and the number of detecting the water level detection frequency by the water level sensor 6 are specifically shown, but this does not particularly limit the means for calculating the temperature correction time.

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 water level difference calculated by the calculation means 13. The control unit 16 sets the average value of the water level differences obtained in the past by the storage unit 15 as the true water level difference, and adjusts the correction time value corresponding to this water level difference to the temperature rise time in the predetermined temperature section detected by the temperature detection unit. Then, the tableware amount is determined based on the temperature rise time after the correction.

The operation of the above configuration will be described with reference to FIG. Step 31 to Step 4 in FIG.
The description up to 0 is omitted because it is the same as the first embodiment. In step 51, the average value Δfxave of the difference between the water level detection frequencies stored previously is set as the average value Δfxave of the difference in the water level detection frequencies, and in step 52, the average value Δfxave of the difference between the water level detection frequencies and step 40. The average value Δfxave of the differences in the water level detection frequencies is newly calculated from the difference Δfx in the water level detection frequencies calculated in step S5, and the calculated average value Δfxave of the differences is stored in the storage means 15 in step S53. Then, in step 54, the average value Δ of the difference between the water level detection frequencies
Let fxave be the difference between the true water level detection frequencies, and in step 55, the temperature rise correction time Δdt corresponding to this difference is calculated. When the water is supplied to the predetermined water level in step 56, the water supply process is ended. Then, as in the first embodiment, the time dt required for the temperature of the cleaning water to actually rise from T1 to T2 is measured, and the temperature rise correction time Δdt is set to the actual cleaning water temperature rise time dt. The temperature rise time dt'after correction is calculated by addition and subtraction. Therefore, even when the water level suddenly changes during water supply under various usage conditions of the dishwasher, the capacity of the dish can be determined.

In the above embodiment, the average value of the water level differences (differences in water level detection frequencies) obtained in the past is used as the true water level difference, but the water level difference with the highest detection degree may be used as the true water level difference. Good.

Next, a third embodiment of the present invention will be described. When the water level difference obtained by the computing means 13 exceeds a preset predetermined range, the control means 16 in FIG. 5 uses the water level difference obtained in the past stored in the storage means 15 to determine this water level difference. The corresponding correction time value is added to or subtracted from the temperature rise time in the predetermined temperature section detected by the thermistor 8, and the amount of tableware is determined based on the corrected temperature rise time. Other configurations are the same as those in the first and second embodiments.

The operation of the above configuration will be described with reference to FIG. Step 31 to Step 4 in FIG.
The description up to 0 is omitted because it is the same as the first embodiment. In step 61, if the difference Δfx between the water level detection frequency fo of the second predetermined water level and the water level detection frequency fx of the first predetermined water level in the standard state is less than or equal to the preset predetermined range, this is determined in step 62. Δfx is stored in the storage means 15, and the temperature rise correction time Δdt is calculated in step 63 using this Δfx. If Δfx exceeds the preset predetermined range in step 61, the previous Δfx previously stored in step 64 is adopted as the current Δfx, and this Δfx is used in step 63
The temperature rise correction time Δdt is calculated at. Step 64
When it is known that the water has been supplied up to the predetermined water level, the water supply process is terminated. Then, as in the first embodiment, the time dt required for the temperature of the cleaning water to actually rise from T1 to T2 is measured, and the temperature rise correction time Δdt is set to the actual cleaning water temperature rise time dt. By adding and subtracting, the temperature rise time dt 'after correction can be calculated, and the capacity of the tableware can be determined.

Next, a fourth embodiment of the present invention will be described. The control means 14 in FIG. 1 uniquely determines the amount of tableware when the water level difference calculated by the calculation means 13 exceeds a preset predetermined range. The other structure is the same as that of the first embodiment.

The operation of the above configuration will be described with reference to FIG. Step 31 to Step 4 in FIG.
The description up to 0 is omitted because it is the same as the first embodiment. In steps 71 and 72, the difference Δfx between the water level detection frequency fo of the second predetermined water level and the water level detection frequency fx of the first predetermined water level in the standard state is less than or equal to a preset predetermined range (e>Δfx> In case of f), this △
In step 73, the temperature rise correction time Δdt is calculated using fx. Δfx in steps 71 and 72
Exceeds a preset predetermined range (e <Δfx <f)
In this case, it is determined that it is impossible to correct the temperature rise time of the wash water due to variations in water level detection by the water level sensor 6, and step 7
4, the temperature rise correction time Δdt is uniquely determined as the time when the tableware capacity corresponds to the maximum capacity. When it is found in step 75 that the water has been supplied up to the predetermined water level, the water supply process is ended. Then, as in the first embodiment, the time dt required for the temperature of the cleaning water to actually rise from T1 to T2 is measured, and the temperature rise correction time Δdt is set to the actual cleaning water temperature rise time dt. The temperature rise time dt'after correction is calculated by addition and subtraction. Therefore, even if the numerical values obtained from the amount of change in the water level detected by the water level sensor 6 per unit time greatly exceed the preset range compared with that in the standard state due to factors such as noise and momentary power failure. The capacity of the tableware can be appropriately determined.

[0037]

As is apparent from the above-described embodiments, according to the present invention, a washing tank for storing dishes, a washing nozzle for ejecting washing water toward the dishes, and a reservoir for collecting the washing water in the washing tank are provided. Cleaning pump for feeding the cleaning water to the cleaning nozzle, a motor for driving the cleaning pump, a heater for heating the cleaning water, a temperature detecting means for detecting the temperature of the cleaning water, and the cleaning water in the cleaning tank. A water level sensor for detecting the water level, control means for controlling a series of sequential operations of washing, rinsing, and drying steps of the tableware, and the amount of change per unit time of the water level detected by the water level sensor after the start of water supply were obtained. The control means includes a calculating means for obtaining a water level difference between the first predetermined water level and the second predetermined water level in the standard state, and the control means has a correction time value corresponding to the water level difference obtained by the calculating means. By By adjusting the temperature rise time in the predetermined temperature zone to be known and determining the amount of tableware based on this corrected temperature rise time, the amount of change in water level per unit time is known by the water level sensor when water is supplied, and it is calculated from this. Also, from the difference in water level between the first predetermined water level and the second predetermined water level in the standard state, it is possible to know the difference in water amount between the amount of water actually supplied to the cleaning tank and the predetermined water amount in the standard state. The correction time value corresponding to this water level difference or water amount difference is added to or subtracted from the time required to actually raise the temperature of the wash water by heating the heater and raise the temperature in the predetermined temperature range, so that the amount of water supplied in the wash tank due to variations in the water level sensor It becomes extremely easy to correct for the variation of the table size, and at the same time, the judgment standard of the tableware capacity becomes uniform and simplification can be achieved.

Further, the control means is provided with a storage means for storing the water level difference obtained by the calculating means, and the control means is the water level difference with the highest detection degree by the storage means or the average value of the water level differences obtained in the past and the true water level. As a difference, the correction time value corresponding to this water level difference is adjusted to the temperature rise time in the predetermined temperature section detected by the temperature detecting means, and the dish amount is determined based on the temperature rise time after the correction. It is possible to easily obtain a very stable water level difference even with rapid changes in water level during water supply under various usage conditions, and to accurately determine the amount of tableware.

Further, the control means is provided with a storage means for storing the water level difference calculated by the calculation means, and the control means holds the water level difference in advance in the storage means when the water level difference calculated by the calculation means exceeds a predetermined range. By using the water level difference obtained in the past, the correction time value corresponding to this water level difference is adjusted to the temperature rise time in the predetermined temperature section detected by the temperature detecting means, and the tableware amount is adjusted by the temperature rise time after this correction. Since the determination is made, even if the water level difference between the first predetermined water level and the second predetermined water level or various numerical values exceed a predetermined predetermined range, the past water level difference stored in advance is stored. And the various values are used to find the water level difference this time,
By using this water level difference, it is possible to determine the amount of tableware this time.

Further, since the control means uniquely determines the tableware amount when the water level difference obtained by the computing means exceeds a predetermined range set in advance, the first predetermined water level and the second predetermined water level are determined. The difference between the water level and the value used when calculating the water level greatly exceeds the preset range, and the actual heating water is heated by the heater and the time required for the temperature rise in the predetermined temperature range Even when the correction is not possible, an appropriate tableware capacity can be easily determined by uniquely determining the tableware amount.

[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 the relationship between the water level detection frequency and the amount of water in the washing tank when water is supplied to the dishwasher.

FIG. 3 is a flowchart showing a process of determining the dish capacity of the dish washing machine.

FIG. 4 is a flowchart showing a process of correcting the temperature rise time due to variations in detection by the water level sensor of the dishwasher.

FIG. 5 is a system configuration diagram of a dishwasher according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing a process of correcting the temperature rise time due to the variation in the water level sensor of the dishwasher.

FIG. 7 is a flowchart showing a process of temperature rise time correction due to variation in detection of a water level sensor of a dishwasher according to a third embodiment of the present invention.

FIG. 8 is a flow chart showing a process of temperature rise time correction due to variation in detection of a water level sensor of a dishwasher according to a fourth embodiment of the present invention.

FIG. 9 is a cross-sectional view of a conventional dishwasher and a configuration diagram of control means.

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

FIG. 12 is a diagram showing the relationship between the amount of wash water and the temperature rise time of the dishwasher.

[Explanation of symbols]

 1 Washing Tank 2 Tableware 3 Washing Nozzle 4 Washing Pump 5 Motor 6 Water Level Sensor 7 Heater 8 Thermistor (Temperature Detecting Means) 12 Controlling Means 13 Computing Means

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

Claims (4)

[Claims] 1. A washing tank for storing dishes, a washing nozzle for ejecting washing water toward the dishes, a washing pump for feeding the washing water accumulated in the washing tank to the washing nozzle, and the washing. A motor for driving the pump, a heater for heating the washing water, a temperature detecting means for detecting the temperature of the washing water, a water level sensor for detecting the water level of the washing water in the washing tank, and washing and rinsing the dishes. A control means for controlling a series of sequential operations of the drying process, a first predetermined water level obtained from a change amount of the water level detected by the water level sensor after the start of water supply per unit time, and a second predetermined water level in a standard state. And a calculation means for obtaining the water level difference of
A dishwashing process in which the correction time value corresponding to the water level difference obtained by the calculation means is adjusted to the temperature rise time in the predetermined temperature section detected by the temperature detection means, and the amount of dishes is determined based on the corrected temperature rise time. Machine. 2. A storage means for storing the water level difference obtained by the computing means, wherein the control means is the water level difference with the highest detection degree by the storage means or the average value of the water level differences obtained in the past as the true water level. 2. A difference, a correction time value corresponding to this water level difference is added to or subtracted from the temperature rise time in a predetermined temperature section detected by the temperature detection means, and the amount of tableware is determined based on this corrected temperature rise time. Dishwasher. 3. A storage means for storing the water level difference calculated by the calculation means is provided, and the control means stores the water level difference in the storage means in advance when the water level difference calculated by the calculation means exceeds a predetermined range. By using the water level difference obtained in the past, the correction time value corresponding to this water level difference is adjusted to the temperature rise time in the predetermined temperature section detected by the temperature detecting means, and the tableware amount is adjusted by the temperature rise time after this correction. The dishwasher according to claim 1, wherein the determination is made. 4. The dishwasher according to claim 1, wherein the control means uniquely determines the amount of dishes when the water level difference obtained by the computing means exceeds a predetermined range set in advance.