JP3329004B2 - dishwasher - Google Patents

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 injecting washing water into dishes stored in a washing tank.

[0002]

2. Description of the Related Art In recent years, there has been proposed a dishwasher in which the capacity of the dishwasher put into the dishwasher is simply determined, and the operation time is more finely controlled in accordance with the capacity.

Conventionally, this type of dishwasher has been configured as shown in FIG. Hereinafter, the configuration will be described.

[0004] As shown in the figure, a washing tank 1 stores tableware 2 therein and stores washing water at the bottom. Cleaning nozzle 3
Is rotatably supported in the washing tank 1 and jets washing water toward the tableware 2. The cleaning pump 4 sends cleaning water to the cleaning nozzle 3, and the cleaning pump 4
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 provided at the bottom of the cleaning tank 1 and heats cleaning water. The thermistor (temperature detecting 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 steam in the washing 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 arranged. The control means 12 includes the tableware 2
A series of sequential operations of the washing, rinsing and drying steps are controlled.

The operation of the above arrangement will be described. When the user places the dishes 2 in the dish basket 11 and stores it in the washing tank 1 and starts the operation after putting the detergent therein, first, the water level is set at the bottom of the washing tank 1. A predetermined amount of tap water is supplied until the sensor 6 detects a predetermined water level. Then, the motor 5 and the heater 7 are energized, and the cleaning water is spouted from the cleaning nozzle 3 toward the tableware 2 by the cleaning pump 4 while being heated. At this time, the temperature of the washing water is detected by the thermistor 8, and the control means 12 keeps track of the temperature of the washing water. When the temperature of the cleaning water reaches a predetermined temperature and a predetermined time has elapsed from the start of the cleaning, the control unit 12 ends the cleaning process and once drains the cleaning water. Next, tap water is newly supplied, and the same operation as in the above-described washing step is performed for several minutes to drain the water. After repeating this rinsing step several times, the same operation as a cleaning step called a heating rinsing step is performed, and when the temperature reaches a predetermined temperature, the operation is finished and drained. Lastly, the blower fan 9 is operated to discharge the steam in the washing tank 1 to the outside of the apparatus, and at the same time, the heater 7 is operated.
The tableware 2 is heated intermittently to dry the attached water droplets.

In the above-described sequential operation, 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 of the washing, rinsing and drying steps 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 is reduced accordingly, and as shown in FIG. That is, when the cleaning process is started, FIG.
In a water supply step of step 17, a predetermined amount of tap water is supplied to the bottom of the cleaning tank 1, heating of the cleaning water by the heater 7 is started in step 18, and the cleaning water is supplied by the thermistor 8 in step 19. When it is confirmed that the temperature has reached the temperature T1, the measurement of the washing water temperature rise time is started in step 20, and if it is determined in step 21 that the washing water has reached the predetermined temperature T2 by the thermistor 8, the process proceeds to step 22. The measurement of the washing water temperature rise time is completed, and the time dt required for the temperature of the wash water to rise from T1 to T2 can be known. In other words, when the input value of the heater 7 is constant, the heat capacity decreases as the tableware capacity decreases, and the heat capacity decreases as shown in FIG.
As shown in FIG. 3, the temperature of the washing water rises faster. In step 23, the capacity of the tableware 2 is determined based on the time dt.

In general, when the volume of the tableware 2 is small, the washing water spouted from the cleaning nozzle 3 often hits the tableware 2, so that the tableware 2 can be washed well. The same applies to drying. Conversely, if the operation time is shortened accordingly, constant washing performance and drying performance can be always 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. There is a problem that the detected water level varies widely and the temperature is easily affected, and a predetermined amount of water cannot be supplied into the cleaning tank.
5, when a smaller amount of water is supplied with respect to a predetermined amount of water supplied in the standard state, and when a larger amount of water is supplied, 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 △ dt1 or 2dt2 from the temperature rise time dth is large, and often becomes larger than the difference in the temperature rise time due to the difference in the capacity 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 solves the above-mentioned problems, and is not affected by variations in the amount of water supplied in a washing tank due to variations in the water level detected by a water level sensor. a series of operations that has been in the capacity, always
As well as achieving a certain level of cleaning and drying performance,
The primary objective is to save energy and save time .

In addition, even when the detection level of the water level sensor is large, the capacity of tableware is constantly detected without being affected by the fluctuation of the water supply amount in the washing tank due to the fluctuation of the detection level of the water level sensor. Performs a series of operations according to the capacity of tableware, and at the same time ensures that constant cleaning and drying performance is obtained.
The second object is to sometimes save energy and save time .

In addition, when the amount of change in the water level detected by the water level sensor per unit time under various use conditions is significantly different from that in the standard state, and the time difference obtained by the calculation means exceeds a predetermined range set in advance. Also, without being affected by variations in the water supply amount in the washing tank due to variations in the water level detected by the water level sensor, the capacity of tableware is stably detected, and a series of operations consistent with the capacity of tableware are always performed.
At the same time, constant cleaning and drying performance can be obtained.
A third object is to save energy and save time .

Also, the amount of change per unit time of the water level detected by the water level sensor is significantly different from that in the standard state.
Even when thus greatly exceeds the predetermined range time difference is preset determined by calculation means, suitably have line capacity determination of tableware, a series of operations that were in the capacity of tableware
At the same time, constant cleaning and drying performance can be obtained.
A fourth object is to save energy and save time .

Further, even when the amount of change in the water level detected by the water level sensor per unit time changes rapidly due to the fluctuation of the water pressure at the time of water supply, even if the water level detected by the water level sensor fluctuates, the water in the cleaning tank due to the variation of the water level detected by the water level sensor will be reduced. The capacity of tableware is stably detected without being affected by variations in the amount of water supply, and a series of operations consistent with the capacity of tableware is performed.
Provides constant cleaning and drying performance while saving energy
The fifth object is to save time and save time .

Furthermore, due to factors such as noise or instantaneous power failure, when the amount of change per unit of water level detected time by the water level sensor is rapidly changed also suitably have line capacity determination of tableware, tableware A series of actions suited to the capacity
At the same time, constant cleaning and drying performance can be obtained.
A sixth object is to save energy and save time .

[0015]

In order to achieve the first object, the present invention provides a washing tank for storing tableware and a washing water.
A cleaning nozzle for jetting toward the dishware, a washing pump for pumping the washing water Tamarira in the cleaning tank in the cleaning nozzle, a motor for driving the washing pump, a heater for heating the washing water, washing water Temperature detecting means for detecting the water temperature of the cleaning tank, and detecting the water level of the cleaning water in the cleaning tank by detecting the water level detecting frequency.
A water level sensor for sensing by known, washing of the dishes, rinsed, and controls a series of sequential operations of the drying process, before
Where the temperature is detected by the temperature detecting means in the washing step.
Depending on the length of the rise time of the washing water in the constant temperature section
And control means for determining the dishes amount, wherein,
After the start of water supply, the predetermined water level detection frequency f
1 to the predetermined water level detection frequency f2.
The amount of change in water level per unit time is calculated from the time required for
From the water level change amount
Reach the predetermined water level detection frequency f3 in a state without sticking
The time it takes to calculate
Before the water level sensor detects the predetermined water level f3.
Time and obtains a time difference of, and correct determination of the tableware amount according to the time difference, depending on the dishes amount after the correction, heating
Cleaning and drying steps with heating
The first is that one of the process times is changed .
Means to solve the problem.

Further, in order to achieve the second object, placed in addition to the first problem solving means, comprising storage means for storing time Difference, the control means is held in said storage means
The time difference with the highest degree of detection or the average value of the time differences obtained in the past is taken as the true time difference, and according to this true time difference,
And correct determination of the tableware amount, depending on the dishes of the corrected
Cleaning and drying processes with heater heating
A second problem solving means is to change at least one of the process times .

[0017] In order to achieve the third object, in addition to the first means for solving problems, comprising storage means for storing time between difference controlling means, the predetermined time between difference preset range If exceeding, the storage have use in the past time difference obtained which had previously been allowed to hold the means to correct the determination of the tableware amount according to the time difference, depending on the dishes amount after the correction, heating
Cleaning and drying steps with heating
The third is that either one of the process times is changed .
Means to solve the problem.

Furthermore, in order to achieve the fourth object, the control means of the first problem solving means, if it exceeds a predetermined range time between difference is preset to determine food stature is the maximum capacity <br This is the fourth problem solving means.

[0019] In order to achieve the fifth object, in addition to the first problem solving means, comprising storage means for storing time between difference controlling means, the amount of change per unit of water level time but when varying beyond a predetermined range set in advance, have use prestored allowed time difference obtained in the past had been in the storage means, the determination of the tableware amount according to the time difference
Make a correction, and according to the corrected tableware amount, heat the heater.
At least one of the accompanying washing step and drying step
The process time is changed as a fifth means for solving the problem.

Furthermore, in order to achieve the sixth object, the control unit of the first problem solving means, per unit of time
The amount of change in water level, to vary beyond a predetermined range set in advance, food stature is a sixth means for solving problems that have to be determined to maximum capacity.

[0021]

According to the first aspect of the present invention, there is provided:
The water level sensor detects the amount of change in water level per unit time at the time of water supply, and calculates the time required to reach a predetermined water level in a state where there is no detection variation in the water level sensor. The time difference from the time required to detect the water level is determined, and from this time difference, there is no detection variation between the amount of water actually supplied to the cleaning tank and the water level sensor.
Water difference between the predetermined amount of water supply have state can be known. A correction time value corresponding to this time difference or water amount difference is obtained, and the cleaning water is actually heated by a heater, and is added to or subtracted from the time required for the temperature rise in a predetermined temperature section. The corrected temperature rise time obtained in this way can be treated equivalently to the value of the temperature rise time measured in a state where there is no detection variation in the water level sensor. Judgment and its judgment
Cleaning work with heater heating according to the fixed tableware quantity
Process time and / or drying process.
It is possible to further.

According to the second means for solving the problem, the amount of change in water level per unit time is known by the water level sensor at the time of water supply, and the time required to reach the predetermined water level in a state where there is no detection variation in the water level sensor is calculated from this. Then, a time difference from the time required until the water level sensor actually detects the predetermined water level is obtained, and this time difference is stored in the storage means for each predetermined time, and the time difference having the highest detection degree or The average value of the time differences obtained in the past is taken as the true time difference, and the correction time value corresponding to the true time difference is added to or subtracted from the time required for actually heating the cleaning water with the heater and increasing the temperature in a predetermined temperature section. The corrected temperature rise time obtained in this way can be treated equivalent to the value of the temperature rise time measured in a state where there is no detection variation in the water level sensor ,
And it was then used to determine a more accurate tableware amount and the determination
Cleaning process with heater heating and drying
The time of at least one of the drying steps can be changed .

According to the third means for solving the problems, the amount of change in water level per unit time is known by the water level sensor at the time of water supply, and the time required to reach the predetermined water level in a state where there is no detection variation in the water level sensor is calculated from this. Then, a time difference from the time required until the water level sensor actually detects the predetermined water level is obtained, and this time difference is stored in the storage means at every predetermined time, and the time difference is set to a predetermined range set in advance. If it exceeds, the current time difference can be obtained by using the previously obtained time difference stored in the storage means in advance, and the current time difference can be calculated by using the previously stored past time difference. The correction time value corresponding to the time difference is added to or subtracted from the time required for actually heating the cleaning water with the heater and increasing the temperature in a predetermined temperature section. The corrected temperature rise time obtained by this is
It can be treated equivalently to the value of the temperature rise time measured in a state where there is no detection variation in the water level sensor, use this to determine a more accurate tableware quantity, and the determined tableware quantity
Cleaning and drying steps with heater heating, depending on
At least one of the process times can be changed .

Further, by the fourth means for solving the problem, the amount of change in water level per unit time is known by the water level sensor at the time of water supply, and the time required to reach the predetermined water level in a state where there is no detection variation in the water level sensor is calculated from this. Then, a time difference from the time required until the water level sensor actually detects the predetermined water level is obtained, and this time difference greatly exceeds a predetermined range set in advance. If you can not compensate for the time required for temperature rise, uniquely have line capacity determination Priority determination of appropriate dishes by determining the maximum capacity dishes amount and the determination
Cleaning process with heater heating and drying
The time of at least one of the drying steps can be changed .

Further, by means of the fifth problem solving means, the amount of change in water level per unit time is known by the water level sensor at the time of water supply, and the time required to reach the predetermined water level in a state where there is no detection variation in the water level sensor is calculated from this. Then, a time difference from the time required for the water level sensor to actually detect the predetermined water level is obtained, and this time difference is stored in the storage means for each predetermined time, and the change per unit time of the water level detected by the water level sensor is obtained. If the amount fluctuates beyond a predetermined range that has been set in advance, the present time difference can be obtained using the previously obtained time difference previously stored in the storage means, and the time difference can be determined. The correction time value is added to or subtracted from the time required for actually heating the cleaning water with the heater and increasing the temperature in a predetermined temperature section. The temperature rise time after correction obtained by this can be treated equivalently to the value of the temperature rise time measured in a state where there is no detection variation in the water level sensor, and using this to determine a more accurate tableware amount , That
Cleaning with heater heating according to the determined amount of tableware
Process time of at least one of the process and the drying process
Can be changed .

According to a sixth aspect of the present invention, when the amount of change in the water level detected by the water level sensor per unit time greatly exceeds a predetermined range set in advance, the actual cleaning water is supplied to the heater. If you can not heated corrected for the time required for temperature rise in a predetermined temperature interval, have rows appropriately capacity determining dishes by eating stature is determined to maximum capacity, in accordance with the determined tableware amount arsenide
Cleaning and drying steps with heating of the
Either step time can be changed .

[0027]

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 above-described conventional example are denoted by the same reference numerals, and description thereof is omitted.

As shown in the figure, the calculating means 13 calculates the time required to reach the predetermined water level in the standard state from the amount of change per unit time of the water level detected by the water level sensor 6 after the water supply to the washing tank 1 is started. And actually, the water level sensor 6
Calculates the time difference from the time required for detecting the predetermined water level. The control means 14 adds or subtracts a correction time value corresponding to the time difference obtained by the calculation means 13 to or from a temperature rise time in a predetermined temperature section detected by the thermistor (temperature detection means) 8. Is determined.

Although not shown, the water level sensor 6 has a magnetic body attached to a diaphragm responsive to pressure,
This magnetic body is provided opposite to the coil so that the inductance of the coil is reduced by a pressure applied from the outside, and the coil is connected to an oscillation circuit. Therefore, when the pressure applied to the water level sensor 6 increases, the oscillation frequency decreases. For this reason, the transition of the oscillation frequency of the water level sensor 6 at the time of water supply in the standard state, that is, the transition of the water level detection frequency is shown by a solid line in FIG. Here, the water level detection frequency fluctuates as indicated by a broken line due to detection variations of the water level sensor 6.

According to the present invention, in the standard state shown by the solid line in FIG. 2, that is, in the state where there is no detection variation, the change amount of the water level per unit time (from the detection of the water level detection frequency f1 to the detection of the frequency f2). The time t2 required to detect the predetermined water level (water level detection frequency f3) obtained from the measured time t1) is calculated. Next, the water level sensor 6 having the detection variation indicated by the broken line in FIG. If the amount of change (time t1 'required from the detection of the water level detection frequency f1 to the detection of the frequency f2) is the same as that in the standard state, the change in the actual water level (water level detection frequency f3) is actually detected. The required time t2 'is measured, and the time difference (△
t = t2−t2 ′) to determine the degree of detection variation of the water level sensor 6, correct the temperature rise time of the washing water according to the degree, and determine the capacity of the tableware 2. is there.

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

When the water supply step is started in step 17 in FIG. 3, it is detected in step 26 in FIG. 4 that the water level frequency detected by the water level sensor 6 has reached f1, and in step 2
At step 7, the measurement is started by a timer (not shown), and at step 28 the water level frequency f2 is detected.
At step 30, the timer measurement time t1 'is known, and at step 30, the time t2 required to supply water to the predetermined water level in the standard state.
Is calculated by the following equation.

T2 = a × t1 '+ b where a and b are constants. In step 31, it is detected that the water level frequency detected by the water level sensor 6 has reached f3, the timer measurement time t2 'is known in step 32, and in step 33, the time difference Δt is calculated by the following equation.

Δt = t2′−t2 In step 34, a temperature rise correction time Δdt corresponding to the time difference Δt is calculated.

△ dt = c × △ tx + d where c and d are constants. When the water is supplied to the predetermined water level in step 35, the water supply step is terminated, and the temperature of the cleaning water is actually set to T by steps 17 to 22 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 or subtracting the correction time value △ dt to or from the actual cleaning water temperature rise time dt in step 24. . Temperature rise time dt 'after this correction
Can be treated in the same manner as the temperature rise time dth due to the heating of the washing water in the standard state, and is not affected by the variation in the water supply amount in the washing tank 1 due to the variation in the detection of the water level by the water level sensor 6, In step 25, the capacity of the tableware can be determined based on a uniform standard.

In the above embodiment, the timing and the number of the detection of the water level detection frequency by the water level sensor 6 are specifically shown, but this does not 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 denoted by the same reference numerals, and description thereof will be omitted.

As shown in the figure, the storage means 15 stores the time difference obtained by the calculation means 13. The control means 16 sets the average value of the time differences obtained in the past by the storage means 15 as a true time difference, and adjusts a correction time value corresponding to the time difference to a temperature rise time in a predetermined temperature section detected by the temperature detection means. The tableware quantity is determined based on the corrected temperature rise time.

The operation of the above configuration will be described with reference to FIG. Step 26 to Step 3 in FIG.
The steps up to 3 are the same as those in the first embodiment, and the description is omitted.

In step 36, the average value of the time difference Δtave previously stored is used as the average value of the time difference Δtave.
The average time difference Δtave of the time difference is newly calculated from the time difference Δt calculated in step (1), and the calculated average value Δtave of the time difference is stored in the storage means 15 in step 38. In step 39, the average value of the time difference Δtave is set as the true time difference Δt, and in step 34, the temperature rise correction time Δdt corresponding to the time difference is calculated. When water is supplied to the predetermined water level in step 35, the water supply step is completed. Then, similarly to 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 corrected temperature rise time dt 'is calculated by addition and subtraction. Therefore, even when the detection variation of the water level sensor 6 is large, the capacity of the tableware can be determined.

In the above embodiment, the average value of the time differences obtained in the past is used as the true time difference. However, the time difference with the highest detection degree may be used as the true time difference.

Next, a third embodiment of the present invention will be described.

The control means 16 in FIG.
If the time difference obtained in Step 3 exceeds a predetermined range set in advance, a predetermined time at which a correction time value corresponding to the time difference is detected by the thermistor 8 using the previously obtained time difference stored in the storage means 15 is used. The amount of tableware is determined based on the temperature rise time after the correction by adding or subtracting the temperature rise time in the section. Other configurations are the same as those of the first and second embodiments.

The operation of the above configuration will be described with reference to FIG. Step 26 to Step 3 in FIG.
The steps up to 3 are the same as those in the first embodiment, and the description is omitted.

In steps 40 and 41, if the time difference Δt calculated in step 33 is within a predetermined range, in step 42 this Δt is stored in the storage means 15.
The correction time value △ dt is calculated using the に て t in step 34. If Δt exceeds a predetermined range in steps 40 and 41, the previous Δt stored in advance in step 43 is adopted as the current Δt, and in step 34, The correction time value △ dt is calculated using the △ t. Step 3
When it is determined that the water has been supplied to the predetermined water level at 5, the water supply step is ended. Then, similarly to 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 corrected temperature rise time dt ′ is calculated by adding or subtracting the temperature rise correction time Δdt to or from the actual washing water temperature rise time dt, 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.
If the time difference obtained in Step 3 exceeds a predetermined range, the amount of tableware is uniquely determined. Other configurations are the same as those of the first embodiment.

The operation of the above configuration will be described with reference to FIG. Step 26 to Step 3 in FIG.
The steps up to 3 are the same as those in the first embodiment, and the description is omitted.

In steps 44 and 45, if the time difference Δt calculated in step 33 is within a predetermined range, a correction time value Δdt is calculated in step 34 using this Δt. If Δt exceeds the predetermined range in steps 44 and 45, it is determined that it is impossible to correct the temperature rise time of the washing water due to variation in water level detection of the water level sensor 6, and the process proceeds to step 46. , The temperature rise correction time Δdt is uniquely determined to be the time when the tableware capacity corresponds to the maximum capacity. Step 35
When it is found that water has been supplied to the predetermined water level, the water supply step is ended. Then, similarly to 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 corrected temperature rise time dt 'is calculated by addition and subtraction. Therefore, even when the amount of change in the water level detected by the water level sensor 6 per unit time greatly exceeds the range set in advance as compared with that in the standard state, it is possible to appropriately determine the capacity of the tableware.

Next, a fifth embodiment of the present invention will be described.

The control means 16 in FIG.
If the amount of change per unit time of the water level obtained in step 3 fluctuates beyond a predetermined range, the storage unit 15
Using the time difference obtained in the past that was held in advance in
A correction time value corresponding to the time difference is added to or subtracted from a temperature rise time in a predetermined temperature section detected by the thermistor 8,
The tableware amount is determined based on the corrected temperature rise time. Other configurations are the same as those of the first and second embodiments.

The operation of the above configuration will be described with reference to FIGS. 9 and 10. Step 26 in FIG.
Steps 29 to 29 are the same as those in the first embodiment, and a description thereof will be omitted.

In step 47, the water level frequency f1 'is detected. In step 48, the timer measurement time t3 is known. In step 49, the water level frequency f2' is detected.
At 0, the timer measurement time t4 is known, and at step 51, the change in the water supply amount per unit time when the water level frequency changes from f1 to f2, and the water level frequency changes from f1 'to f2'.
Is compared with the change in the amount of water supply per unit time at the time of change to the above. If this value exceeds a predetermined range, the previous Δt stored in advance in step 52 is replaced by the current Δt. The correction time value △ dt is calculated using this △ t in step 34. Step 51
If the value compared in the step is within the predetermined range, step 30
In step 33, the time difference Δt is calculated in the same manner as in the first embodiment, and in step 53, the time difference Δt is stored in the storage unit 1.
5, and a correction time value △ dt is calculated using this △ t in step 34. When it is determined in step 35 that the water has been supplied to the predetermined water level, the water supply step ends. Then, similarly to 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 corrected temperature rise time dt 'is calculated by addition and subtraction. Therefore, even when the amount of change in the water level detected by the water level sensor 6 per unit time suddenly changes due to the change in the water pressure of the tap water at the time of water supply, the capacity of the tableware can be determined.

Next, a sixth embodiment of the present invention will be described.

The control means 14 in FIG. 1 determines the amount of tableware uniquely when the amount of change per unit time of the water level detected by the water level sensor 6 fluctuates beyond a predetermined range set in advance. Like that. Other configurations are the same as those of the first embodiment.

The operation of the above configuration will be described with reference to FIG. Steps 26 to 29 and steps 47 to 50 are the same as those in the fifth embodiment, and a description thereof will be omitted.

In step 51, when the water level frequency is f1
The change in the water supply amount per unit time when the water level changes from f1 to f2 is compared with the change in the water supply amount per unit time when the water level frequency changes from f1 'to f2', and this value is set in advance. If it exceeds the predetermined range, it is determined that it is not possible to correct the temperature rise time of the washing water due to the variation in the water level detection of the water level sensor 6, and the process proceeds to step 54. A time corresponding to the capacity is determined, and a correction time value △ dt is calculated using this △ t in step 34. If the value compared in step 51 is within the predetermined range, the process proceeds from step 30 to step 3
4, the time difference Δt is calculated in the same manner as in the first embodiment,
The correction time value △ dt is calculated using the △ t. When it is determined in step 35 that the water has been supplied to the predetermined water level, the water supply step ends. Then, similarly to 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 corrected temperature rise time dt 'is calculated by addition and subtraction. Therefore, even if the amount of change in the water level detected by the water level sensor 6 per unit time changes rapidly due to factors such as noise and instantaneous power failure, it is possible to appropriately determine the capacity of tableware.

[0058]

According to the present invention As apparent from the above embodiment according to the present invention, a cleaning tank to contain the dishes, and the washing water cleaning nozzle for jetting toward the tableware was Tamarira to the washing tub a washing pump for feeding washing water to the washing nozzle, a motor for driving the washing pump, a heater for heating the washing water, a temperature detecting means for detecting a temperature of the washing water, the water level of the washing water in the cleaning tank The water level detection frequency can be detected
A water level sensor for sensing by the washing of dishes, rinsed, and controls a series of sequential operations of the drying process, the cleaning process
A predetermined temperature section detected by the temperature detecting means in
The amount of tableware based on the length of time for
And a constant controlling unit, wherein the control means, the water supply after the start
From the predetermined water level detection frequency f1 by the water level sensor
Detect until the water level detection frequency f2 is reached, and it takes
Calculate the water level change per unit time from the time
There is no detection variation in the water level sensor based on the amount of change in the water level
Required to reach the predetermined water level detection frequency f3 in the state.
Time calculated, and the calculated time and the actual water level
A time difference from the time required until the sensor detects the predetermined water level f3 is determined, and the amount of tableware is determined according to the time difference.
Make a correction, and according to the corrected tableware amount, heat the heater.
At least one of the accompanying washing step and drying step
The process time is changed, making it very easy to correct for variations in the amount of water supplied in the washing tank due to variations in water level detection by the water level sensor. it is possible to make a series of operations, always a constant cleaning performance drying performance
Not only saves energy but also saves time.
It is .

[0059] Furthermore, comprising storage means for storing time Difference,
Control means, an average value of the highest time difference of the detection degree or time difference obtained in the past which had been held in the storage means as a true time difference, the dishes amount according to the time difference between the true
Determination to correct, in accordance with the tableware amount after the correction, the heater
At least one of the washing and drying steps with heating
One of process time it is so arranged to change or Re, even if the detected variation of the water level sensor is large, can be easily obtained a very stable time difference, thus accurately able to determine the dishes amount, that According to the determined tableware quantity
Cleaning and drying processes with heater heating
Since at least one of the process times is changed,
Provides constant cleaning and drying performance while saving energy
Ru der that will save over reduction and time.

[0060] Furthermore, comprising storage means for storing time Difference,
Control means, if it exceeds a predetermined range time between difference is preset, have use in advance was allowed to hold the time difference obtained in the past in the storage unit, the determination of the tableware amount according to the time difference
Make a correction, and according to the corrected tableware amount, heat the heater.
At least one of the accompanying washing step and drying step
Since the process time was changed, the amount of change per unit time of the water level detected by the water level sensor under various use conditions was significantly different from that in the standard state, and the time difference obtained by the calculation means was set in advance. Even in the case of exceeding the predetermined range, the current time difference is obtained by using the past time difference stored in advance, and the current tableware amount can be determined by using the time difference, and the determined tableware amount can be determined. Depending on the heating of the heater
At least one of the following washing step and drying step
Since the process time is changed, the cleaning performance and drying performance are always constant.
Not only saves energy but also saves energy and saves time.
Ru shall Der.

[0061] The control means may, if it exceeds a predetermined range time between difference is preset, because food stature was made to determine the maximum capacity, the amount of change per unit time of the water level detected by the water level sensor is standard In the case where the time difference obtained by the calculation means greatly exceeds the predetermined range set as a result and the time required for heating the actual cleaning water with the heater and increasing the temperature in the predetermined temperature section cannot be corrected. In addition, it is possible to easily determine an appropriate tableware capacity by uniquely determining the tableware amount, and to heat the heater in accordance with the determined tableware amount.
At least one of the washing step and the drying step
The cleaning time and drying performance are always constant because the process time is changed.
Saves energy and saves time
Monodea Ru.

[0062] Furthermore, comprising storage means for storing time Difference,
Control means, use amount of change per unit of water level time, to vary beyond a predetermined range set in advance, prestored allowed time difference obtained in the past had been in the storage means
There corrects the determination of the tableware amount according to the time difference, this
Washing with heater heating according to the amount of dishes after correction
Process time of at least one of the cleaning process and the drying process
It is so arranged to change the, by variations in water pressure of tap water in the water supply time, when the amount of change per unit of water level detected time by the water level sensor is rapidly changed also, stably detect the capacity of tableware and, because can always be a series of operations that were in the capacity of dishes, always one
Provides constant cleaning and drying performance while saving energy
And save time .

[0063] In addition, the control means, per unit of time water
The amount of change in position is, if varies beyond a predetermined range set in advance, because food stature was made to determine the maximum capacity, noise and the factors of the instantaneous power failure or the like, the water level detected by the water level sensor Even when the amount of change per unit time fluctuates sharply and the actual cleaning water cannot be corrected for the time required for heating the heater and increasing the temperature in a predetermined temperature section, it is easy to determine the tableware amount uniquely. The appropriate tableware capacity can be determined, and the determined
Cleaning process with heater heating and drying
Change the time of at least one of the drying processes
As a result, constant cleaning performance and drying performance can be obtained at the same time.
Der Ru thing that will save energy saving and time.

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

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

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

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

FIG. 8 is a flowchart illustrating a process of correcting a temperature rise time due to detection variation of a water level sensor of a dishwasher according to a fourth embodiment of the present invention.

FIG. 9 is a diagram showing the relationship between the water level detection frequency and the amount of water in a washing tank when water is supplied to a dishwasher according to a fifth embodiment of the present invention.

FIG. 10 is a flowchart showing a process of correcting a temperature rise time due to detection variation of a water level sensor of the dishwasher.

FIG. 11 is a flowchart showing a process of correcting a temperature rise time due to detection variation of a water level sensor of a dishwasher according to a sixth embodiment of the present invention.

FIG. 12 is a system configuration diagram of a conventional dishwasher.

FIG. 13 is a diagram showing a relationship between a rise in temperature of washing water of the dishwasher and the capacity of tableware.

FIG. 14 is a flowchart showing a process of determining the dish capacity of the dishwasher.

FIG. 15 is a diagram showing the relationship between the amount of washing water and the temperature rise time of the dishwasher.

[Explanation of symbols]

 DESCRIPTION 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) 13 Calculation means 14 Control means

────────────────────────────────────────────────── ─── Continued on the front page Examiner Nobuhiro Kagami (56) References JP-A-4-336023 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47L 15/00-15 / 48

Claims (6)

(57) [Claims] And 1. A cleaning tank accommodating the dishes, and the cleaning nozzle for jetting cleaning water toward the <br/> dishes, and cleaning the pump for feeding the washing water Tamarira in the cleaning tank in the cleaning nozzle A motor for driving the cleaning pump, a heater for heating the cleaning water, a temperature detecting means for detecting a temperature of the cleaning water, and a water level detecting frequency for detecting a water level of the cleaning water in the cleaning tank.
A water level sensor for sensing by known, washing of the dishes, rinsed, and controls a series of sequential operations of the drying process, before
Where the temperature is detected by the temperature detecting means in the washing step.
Depending on the length of the rise time of the washing water in the constant temperature section
And control means for determining the dishes amount, wherein,
After the start of water supply, the predetermined water level detection frequency f
1 to the predetermined water level detection frequency f2.
The amount of change in water level per unit time is calculated from the time required for
From the water level change amount
Reach the predetermined water level detection frequency f3 in a state without sticking
The time it takes to calculate
Before the water level sensor detects the predetermined water level f3.
Time and obtains a time difference of, and correct determination of the tableware amount according to the time difference, depending on the dishes amount after the correction, heating
Cleaning and drying steps with heating
Dishwasher with one of the process times changed . 2. A comprising a storage means for storing between difference, the control means, the mean value of the highest time difference of the detection degree or time difference obtained in the past which had been held in the storage means as a true time difference According to the true time difference, the determination of the amount of tableware is corrected, and according to the corrected amount of tableware, heating of the heater is adjusted.
At least one of washing and drying processes involving heat
The dishwasher according to claim 1, wherein one of the process times is changed . 3. A comprising storage means for storing between difference when the control means, if it exceeds a predetermined range time between difference is preset,
There use previously retained allowed time difference obtained in the past had been in the storage means, correct determination of the tableware amount according to the time difference
Then, according to the corrected tableware amount, the heating of the heater is
Nau Sukunakutomoi displacement washing step and the drying step or the other Engineering
2. The dishwasher according to claim 1, wherein the time is changed . Wherein the control means, if it exceeds a predetermined range time between difference is preset, dishwasher of claim 1 wherein the food stature was made to determine the maximum capacity. Comprising storage means for storing between difference time wherein the control means, if the amount of change per unit of water level time is varied over a predetermined range set in advance, in the storage means There use the prestored time difference obtained in the past allowed to correct the determination of the tableware amount according to the time difference, the correction
Cleaning process with heater heating according to the amount of tableware
The dishwasher according to claim 1, wherein the time of at least one of the drying step and the drying step is changed . 6. A control means, such variations <br/> of the amount of water per unit of time, to change beyond a predetermined range set in advance, food stature is determined that the maximum capacity Claim 1
Dishwasher as described.