JP3496313B2 - Dishwasher - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher used in homes, industrial use and the like. 2. Description of the Related Art In a conventional dishwasher / dryer, a user selects a plurality of times from a plurality of predetermined times irrespective of the amount of dishes, and sets a washing time before the apparatus is driven.
After determining the rinsing time and drying time,
Drying was performed. [0003] However, in the above method, the set time in each step is determined regardless of the amount of tableware, so that the set time corresponds to the washing state and drying state of the tableware. It was difficult to set the time for each process. Especially in the drying process, if the drying process is performed irrespective of the drying condition, the drying time is too long and the temperature of the tableware rises abnormally.When removing the tableware after the drying process, it is difficult to remove the tableware and the user may get burned. , also, tableware there has been a case of any inconvenience to Luna is generated or altered damage. On the other hand, if the drying time is too short,
Even when the drying process is completed, there is a problem that water remains in the inside of the glass cup or the depression of the tableware and the drying is not sufficient. The present invention is intended to solve such a problem, and it is economical and economical to control the drying process time by accurately knowing the drying state of tableware in a refrigerator from a change in the output of a temperature sensor or the like. and purpose thereof is to provide a dishwasher to perform optimal drying. [0006] The present onset bright [SUMMARY OF] includes a body, a cleaning tank for cleaning the dishes, and a heating device for heating the washing water and drying air, a cleaning nozzle for jetting cleaning water, washing A circulation pump that circulates water, and a drainage pump that drains cleaning water,
In a dishwasher / dryer having a water supply device for supplying cleaning water, an air suction device for generating dry air, a temperature detection unit for detecting a temperature in the cleaning tank, and a control circuit for controlling these, a control circuit includes a heating device. , Cleaning nozzle, circulation pump, drain pump, actuator control means for controlling the water supply device and the suction device, stroke management means for managing the washing and drying process, storage means for storing the detection value from the stroke and temperature detection means , Bei a dry end detection means for controlling the inter-dry燥時
The drying end detecting means detects the detected value of the temperature detecting means.
Comparing time changes to detect the inflection point of temperature changes in the cleaning tank
And the detection of the position of the bending point and the temperature detecting means before and after the bending point
The heat capacity in the cleaning tank is inferred from the time change of the
Drying end time to determine the drying end time based on the heat capacity of
Determination means for determining the time, the time to the inflection point and its size
Detects the drying of the inner wall of the cleaning tank
Is detected, the drying end time is inferred earlier.
Wall wetness detecting means for instructing the drying end time determining means.
It is a thing. The drying time of the dishwasher is determined according to the heat capacity of the object to be dried. This heat capacity is determined not only by the amount of dishes but also by the internal temperature and humidity. In the drying process, the heat is applied and the steam is forcibly exhausted to evaporate the water in the refrigerator and dry the dishes. In the early stage of the drying process, the temperature inside the oven rises,
Evaporation of water in the refrigerator starts, and steam in the refrigerator increases rapidly. For this reason, both the temperature and humidity in the refrigerator rise, and when the amount of water evaporation and the amount of exhaust gas become almost the same, the state shifts to an equilibrium state. Thereafter, the storage wall having a high temperature conductivity is dried first, and after the storage wall is dried, the temperature further increases and the equilibrium state is broken. At this time, the evaporation amount falls below the exhaust amount, and the humidity gradually decreases. Eventually, the temperature will gradually rise, during which the dishes will dry. Considering such a transition of the drying process, it is considered that the heat capacity in the refrigerator can be estimated based on the time required to reach the equilibrium state. In other words, by observing the temperature state (dry state) of the storage wall having the same capacity, estimate the heat capacity of the entire storage that should have affected it, and thereby estimate the drying end time of tableware. Is considered possible. [0008] The present onset Ming, is intended to act as follows. Drying end detection means includes a bending point analysis means for detecting the bending point of comparison temperature change the time variation of the temperature sensing means, inferring the heat capacity of the cleaning tank by the location and time change amount before and after the bending points of the bending point A heat capacity inferring means for performing drying, a drying end time determining means for determining a drying end time based on the heat capacity, and a drying detection of an inner wall of the cleaning tank based on a time to the bending point and a size thereof, thereby detecting that the wall is dry. For example, by controlling the drying process by detecting the end of drying by using the wall wetting detecting means that instructs the drying end time determining means to infer the drying end time earlier, economical and optimal drying is achieved. Can be provided. FIG. 1, FIG. 2, FIG. 3, and FIG. 4 show an embodiment of the present invention.
This will be described with reference to FIG. As shown in FIG. 1, this embodiment comprises a main body 1 and
Washing tank 2 for washing dishes, and dish basket 3 for storing dishes
Water supply means 4 for supplying cleaning water, suction means 5 for taking in dry air, and heating means 6 for heating cleaning water and dry air.
A circulating pump 7 for circulating the washing water, a washing nozzle 8 for ejecting the washing water, a drainage means 9 for draining the washing water, and a first means mounted on the ceiling of the washing tank and detecting the temperature inside the washing tank. Temperature detecting means 10, second temperature detecting means 11 for detecting the temperature of the bottom of the washing tank, third temperature detecting means 12 for detecting the outside air temperature, a microcomputer for controlling the actuators and the detecting means, and an electronic device. The control means 13 is constituted by a circuit. Control means 13
Is constituted by an actuator control circuit 14 for controlling each of the actuators 4 to 9, a temperature detection circuit 15 for controlling the temperature detection means and processing signals, and a microcomputer 16 for controlling the signals 14 and 15. As shown in FIG. 2, the microcomputer 1
6 is a drying end detecting means 17 for detecting the end of drying based on a signal from the temperature detecting circuit 15, a step managing means 18 for managing and controlling each step of the dishwasher, and 17, 18
And storage means 19 for storing the constants and variables required in. The drying end detecting means 17 detects a bending point of the temperature change based on the input from the temperature detecting means and the time series of the temperature change stored in the time series storage means 23 in the storage means 19. It comprises a means 20, a heat capacity inferring means 21 for inferring a heat capacity based on the position of the inflection point and a temperature change before and after, and a drying end time determining means 22 determined based on the inferred heat capacity. The storage means 19
Is a time series storage means 23 for storing an output from the temperature detection circuit, an inference constant storage means 24 for storing a constant of an inference equation used for heat capacity inference, a required time in each process,
It comprises a process storage means 25 for storing control constants and the like. Next, the operation of the embodiment will be described with reference to FIG. First, when the user sets the tableware in the tableware basket 3 and puts it in the main body 1 and then turns on the power, the dishwasher automatically starts the washing process. Subsequently, a rinsing process is performed, and finally, after draining, a drying process is started. As shown in FIG. 4, when the drying process starts, the heating unit 6 and the suction unit 5 are first energized to heat the inside of the storage, and the air in the storage is replaced with the outside air by the suction unit 5. When the two units are energized, the process enters a drying end detection process.
During the drying end detection process, the heating device control process interrupts at regular intervals, and as shown in FIG. 5, the heating device control process controls the temperature of the heating device. When the detection of the end of the drying is completed, the heating unit 6 and the suction unit 5 are energized until the drying end time. During this time, the heating means control routine interrupts at regular intervals, detects the heater temperature, and controls the internal temperature. Next, the drying end detection step will be described with reference to FIG. When the drying end step is started, the temperature detecting means 1
By means of 0, 11, and 12, the temperatures of the inside of the cleaning tank, the bottom of the cleaning tank, and the outside air are measured. The signal processed by the temperature detection circuit 15 is input to the inflection point analysis means 20 and stored in the time series storage means 23, and the inflection point analysis is performed. The method of analyzing the inflection point will be described below. T (n) -Tp = DELTA_T (n)
T (n): input measured temperature tn−tn−1 Δt T
p: measured temperature previously input (= T (n-1)) In this equation, if the time between T and Tp is very short, DELTA_T becomes equal to the derivative of the time series T. As shown in FIG. 7, the normal temperature curve (a) is initially DELT
A_T is almost constant, but it changes at A and D
ELTA_T suddenly decreases. Further, as the drying proceeds, it reaches B and DELTA_T also changes suddenly. And
Eventually it will settle down to a small value. At this time, A,
In B, it can be said that the time series T has an inflection point. That is, the time series T can have three inflection points. After detecting the positions of these inflection points, the heat capacity is inferred based on the information. That is, the heat capacity is determined by the time between the inflection points 1 and 2 (tAB in FIG. 7), the temperature change from A to B, and the time to the inflection point 1 (tA). Larger heat capacity tA
B and tA become longer, and the temperature change becomes smaller. The drying end time is determined based on the inferred heat capacity. As shown in FIG. 6, the temperature detected by the first temperature detecting means is processed by the detecting circuit and stored in the time-series storing means, and the inflection point analyzing means outputs the inputted temperature. The difference between T2 and the newly entered temperature T1,
Calculate DELTA_T. In addition, the previously calculated D
The difference between ELTA_T and DELTA_T calculated this time is calculated, and if the difference is larger than the threshold, it is determined that the time measured this time falls on the inflection point of the temperature curve. When the second inflection point is determined, the time between the two inflection points is calculated, and the heat capacity proportional to the time is determined based on the graph of FIG. Further, the time required until the end of drying is determined by the graph of FIG. 10 based on the determined heat capacity and the outside air temperature measured by the third temperature detecting means. In this embodiment, the heat capacity is inferred by time,
Although it was performed based on the temperature change, it is of course possible to infer this by performing T curve pattern recognition using a neural network. Embodiment 2 An embodiment of the present invention will be described with reference to FIG. The basic configuration of the dishwasher in this embodiment is the same as that in the first embodiment. As shown in FIG. 8, an actuator control circuit 14 for controlling each actuator, a temperature detection circuit 15,
It is controlled by a control circuit 13 constituted by a control means 16. The actuator control circuit 14 and the temperature detection circuit 15 are the same as those in the first embodiment. Control means 1
The drying end detecting means 26 in 6 is a bending point analyzing means 27.
Heat capacity inferring means 28 and drying end time determining means 30
And wall wetting detecting means 29. The inflection point analyzing means 27, the heat capacity inferring means 28, and the drying end time determining means 30 are the same as those in the first embodiment. Next, the operation of this embodiment will be described. The steps other than the drying time end determination of the drying end detection step are the same as those in the first embodiment. In the drying process, the heating device 6 and the suction device 5
Is turned on, the drying end detection process starts, and the inflection point analysis starts. The inflection point analysis is performed in the same manner as in the first embodiment. At this time, if the second inflection point is not detected even after a certain period of time has elapsed (see FIG. 7B), the wall wetness detecting means 29 Informs the drying end time determination means 30 that the wall is not wet. In response to this, the drying end time determining means 30 sets the drying end time to be shorter than when the wall is wet, using the graph of FIG. 11 based on tA.
When it is determined that the wall is wet, the drying end time is determined in the same procedure as in the first embodiment. Other stroke operations are performed in the same manner as in the first embodiment. According to the present invention, it is possible to provide a dishwasher that performs economical and optimal drying by controlling the drying process based on a change in the output of a temperature sensor or the like. By performing the drying end time based on the time series data of the internal temperature, it is possible to cope with a change in the middle and to perform the drying with an optimal drying time. Furthermore, since the drying time is determined by calculating the internal heat capacity, it is possible to determine the drying time according to how to put the dishes, the material, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a dishwasher and dryer of the present invention. FIG. 2 is a block diagram of a control circuit of a first embodiment of the present invention. FIG. 3 is a flowchart of a basic operation of the present invention. 4: Flow chart of drying process of the present invention FIG. 5: Flow chart of heating means control process of the present invention FIG. 6: Flow chart of drying end detecting process of the first embodiment of the present invention FIG. 7: Temperature detection of the present invention FIG. 8 is a diagram showing the output of the circuit. FIG. 8 is a configuration diagram of a control circuit according to a second embodiment of the present invention. FIG. 9 is a characteristic diagram for determining a heat capacity. FIG. 10 is a characteristic diagram for determining a drying time. FIG. 11 is a characteristic diagram for determining a drying time when wall wetness is detected. [Description of References] 1 Main body 2 Washing tank 3 Dish basket 4 Water supply device 5 Intake device 6 Heating device 7 Circulation pump 8 Cleaning nozzle 9 Drain pump 10 First temperature detecting means 11 Second temperature detecting means Informing means 12 third temperature detecting means 13 control circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A47L 15/46

Claims (1)

(57) [Claims] [Claim 1] A washing tank for washing a main body, dishes, a heating device for heating washing water and drying air, a washing nozzle for jetting washing water, and a circulation of washing water. A circulating pump, a drain pump for draining washing water, a water supply device for supplying washing water, an intake device for taking in dry air from outside, and a temperature detecting means for detecting the temperature in the washing tank, and controlling these. And a control circuit that performs heating, a cleaning nozzle,
Circulation pump, drain pump, an actuator control means for controlling the water supply device and the intake device, a process management unit for managing the cleaning and drying process, and storage means for storing a detection value from the stroke and the temperature sensing means, between dry燥時Drying end detecting means for controlling , wherein the drying end detecting means is capable of detecting temperature.
Temperature change in the cleaning tank by comparing the time change of the detection value of the means
Of the inflection point, and the position of the inflection point and the temperature before and after the inflection point
The heat volume in the cleaning tank depends on the time variation of the detection value of the detection means.
Infer the amount and determine the drying end time based on this heat capacity.
Determining means for determining the drying end time, and the time until the bending point
Detects the drying of the inner wall of the cleaning tank according to the interval and the size.
If it detects that the wall is dry, advance the drying end time earlier.
As described above, the wall wetness detection is instructed to the drying end time determination means.
Dishwasher and dryer having intellectual means .