JPH0520103U - Electric heating container power control device - Google Patents

Abstract

(57) [Summary] [Purpose] The electric power is controlled to be constant and the rate of temperature rise is maintained to be constant, enabling accurate control such as capacity determination. [Structure] The switch means 39 turns on and off the current to the heating means 4. The current or voltage detection means 38 transforms the voltage to the heating means 4, rectifies and smoothes it, and detects the smoothed current or smoothed voltage. The control means 35 integrates the current or voltage detected by the current or voltage detection means 38 at regular time intervals, and when the integrated value reaches the target integrated value, operates the switch means 39 to heat the heating means 4 To the heating means 4 to which an alternating voltage is applied by turning off the current to the
Power consumption is controlled to a predetermined power (1020 W) which is set smaller than the rated power consumption (1200 W).

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a power control device for an electric heating container such as a dishwasher, an electric pot, and a rice cooker.

[0002]

[Prior Art]

 In this type of electric heating container, for example, an electric heater is provided at the bottom or inside of the container as a heating means, and an AC voltage from a commercial power source is applied to the electric heater to heat the object to be heated in the container. It has become so

[0003]

[Problems to be solved by the device]

 However, since the AC voltage applied to the electric heater fluctuates due to various causes, the power consumption of the electric heater fluctuates due to the fluctuation of this voltage, and the rate of temperature rise of the heated object is not constant. For this reason, in the electric heating container in which the capacity of the object to be heated is determined based on the temperature increase rate, there is a problem that the capacity cannot be accurately determined due to the change in the temperature increase rate due to the power fluctuation. .. The present invention has been made in view of the above problems, and provides an electric heating container power control device capable of controlling electric power at a constant rate to maintain a constant temperature rise rate and performing accurate control such as capacity determination. It is intended to be provided.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a power control device for an electric heating container that controls the power consumption of a heating means to which an AC voltage is applied to a predetermined power set to be smaller than the rated power consumption. A switch means for turning on and off an electric current, a current or voltage detecting means for transforming and rectifying and smoothing a voltage to the heating means, and detecting the smoothed current or smoothed voltage, and the current or voltage detecting means. And a control means for operating the switch means to turn off the current to the heating means when the integrated value of the current or voltage is integrated at regular intervals and the integrated value reaches the target integrated value. .

[0005]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a dishwasher equipped with a device according to the invention. A cleaning tank 2 is housed inside the exterior body 1, and the exterior body 1 and the cleaning tank 2 can be opened by a front door (not shown). A dish basket 3 is housed inside the washing tank 1, and a heater 4 as a heating means is arranged inside the bottom so as to be immersed in the standard liquid surface NL. A water reservoir 5 is formed at the bottom of the cleaning tank 2, and a suction pipe 7 of a cleaning pump 6 and a suction pipe 9 of a drainage pump 8 are attached to the water reservoir 5. The washing pump 6 and the drainage pump 8 are driven by motors 10 and 11, respectively.

The discharge pipe 12 of the cleaning pump 6 penetrates from the bottom of the cleaning tank 2 to the inside, and a first injection nozzle 13 is rotatably attached to the tip thereof. A branch pipe 14 branched from the middle of the discharge pipe 12 rises at the rear portion of the cleaning tank 2, and a second injection nozzle 15 is rotatably attached to the tip thereof. The first jet nozzle 13 and the second jet nozzle 15 are hollow rod-shaped and are rotated by the washing water spouted from the jet holes arranged in the longitudinal direction. The discharge pipe 16 of the drainage pump 8 is guided to the rear part of the back of the cleaning tank 2, and once it is started up, it is lowered to the bottom. ing.

A water supply pipe 17 penetrating the rear surface of the cleaning tank 2 and opening to the inside is erected from the vicinity of the drainage pipe connection port of the discharge pipe 16, and the water supply pipe 17 is opened and closed by a solenoid 19. A water supply valve 18 is provided. A fan 20 is provided above the inside of the cleaning tank 2 and is rotated by a fan motor 27. Further, a float type water level detection switch 23 for detecting the water level of the washing water is provided inside the washing tank 2, and a temperature sensor 22 is provided on the outer surface of the bottom.

An operation panel 24 as shown in FIG. 2 is provided on the front surface of the exterior body 1. This operation panel 24 has keys K1 to K6 for starting each course of full automatic, low temperature full automatic, prewash, rinse / dry, dry and care, and key K7 for pause and restart. It is provided. Also, six LEDs L1 to L6 that light up when the keys K1 to K6 are turned on, three LEDs L7 to L9 that light up during the course of each process of washing, rinsing, and drying of each course, and the LEDs of each course. A segment LED L10 for displaying the remaining time until the end is provided.

The key K1 of the fully automatic course and the key K2 of the low temperature fully automatic course become a standard course in which a standard cleaning time is set in one operation, but by operating the key twice continuously, You can select a careful course with a long cleaning time. At this time, L1 and L2 change from red to green.

This dishwasher is provided with a power control device according to the present invention. That is, as shown in FIG. 3, the AC voltage V is supplied to the heater 4 to which the AC voltage V from the commercial power supply 30 is applied.₁There is provided a current transformer 31 for transforming the relay and a contact 32a of the relay 32. On the secondary side of the current transformer 31, the voltage V₁AC voltage of V₂Rectifying circuit 33 for rectifying the direct current of the ₂ Voltage of DC₃And a smoothing circuit 34 is provided. Analog voltage V smoothed by the smoothing circuit 34₃Is input to an A / D converter 36 incorporated in the microcomputer 35 and converted into a digital value. The + side of the coil 32b of the relay 32 is connected to the DC power supply, and the − side is connected to the emitter of the transistor 37. The transistor 37 has its collector connected to ground and its base connected to the output port O of the microcomputer 35. The current transformer 31, the rectifying circuit 33, the smoothing circuit 34 and the A / D converter 36 constitute the voltage detecting means 38 of the invention, and the relay 32 and the transistor 37 constitute the switching means of the invention. The microcomputer 35 constitutes not only the control means of the present invention but also control means for sequentially executing the steps of washing, rinsing and drying the course selected by the keys K1 to K6.

The operation of the fully automatic and low temperature fully automatic course process will be described below with reference to the flowcharts of FIGS. 4 to 6 and FIG. 8. Descriptions of other courses are omitted because they are not directly related to the present invention. In the fully automatic course, as shown in Fig. 4, initial drainage, washing, rinsing with hot water, and drying are performed automatically. Low-temperature full-auto is a course for washing tableware that is sensitive to heat, such as plastic tableware, and is exactly the same as full-auto except that the washing time at the time of washing, the control temperature of washing water, the drying temperature and the drying time are different. It is a process. In this course, the cold water rinsing frequency and drying time are automatically set and adjusted based on the amount of tableware determined by the amount of tableware that is determined during washing.

Initial drainage In the initial drainage of step 101 shown in FIG. 4, the drainage pump motor 11 is driven for 10 seconds, and the cleaning water remaining in the water reservoir 5 of the cleaning tank 2, the suction pipes 7, 9, etc. is drained. It is drained by the pump 8. Here, when there is water up to the normal water level NL and the water level switch 23 is off, normal drainage is performed for 50 seconds. In the washing process, first, in step 102, the solenoid 19 is turned on to open the water supply valve 18, and water is supplied into the cleaning tank 2 through the water supply pipe 17. This water supply ends when the water level reaches the normal water level NL and the water level detection switch 23 is turned off.

Next, in step 103, the heater 4 is energized, the temperature of the cleaning water is controlled to 60 ° C. (50 ° C. in low temperature full automatic), and the cleaning pump motor 10 is started. As a result, the cleaning water in the water reservoir 5 is sucked by the cleaning pump 6 and sprayed from the first and second spray nozzles 13 and 15 toward the tableware, and the dirt on the tableware is washed off. The wash water sprayed toward the tableware flows down into the water reservoir 5 and is circulated. This cleaning is completed in 9 minutes in the standard course and 14 minutes in the careful course after the temperature sensor 22 detects 40 ° C.

During the washing, while the water temperature rises from 40 ° C. to 50 ° C., the dish amount of the dishes stored in the washing tank 2 is discriminated as described later, and the conditions of the steps described later are performed. Is set. Then, in step 104, the drainage pump motor 11 is started for 50 seconds, and the dirty cleaning water is drained. It should be noted that this drainage is paused for 3 seconds after 30 seconds so that air is not sucked into the pump.

Power Control As described above, in the dish quantity determination performed during washing in step 103, power control is performed in step 1001 until the water temperature changes from 40 ° C. to 50 ° C., as shown in FIG. Be done. In this power control, as shown in FIG. 6, first, in step 1101, the relay 32 is turned on to energize the heater 4. Then, in step 1102, a 30-second timer built in the microcomputer 35 is started, and in step 1103, Si is set to zero. Next, in step 1104, the rectified and smoothed voltage value V ₃ is detected by the A / D converter 36 as a digital value, and in step 1105, the 0.5 second timer built in the microcomputer 35 is started. Thereafter, in step 1106, the integrated value Si = Si + 0.5 * V ₃ is calculated, and in step 1107 it is determined whether the integrated value Si has become equal to or greater than the target integrated value S ₀ .

The target integrated value S ₀ is a reference voltage value V ₀ that gives the target power consumption of the heater 4 of 0. It is a value obtained by integrating every 5 seconds for 30 seconds. As the target power consumption, a value smaller than the rated power consumption 1200 W, that is, the power consumption at the expected minimum value of voltage fluctuation, for example, 1020 W is set. If the integrated value Si is less than the target integrated value S _{0 in} step 1107, the process returns to step 1104 after waiting for 0.5 seconds in step 1108. As a result, the voltage value V ₃ is continuously detected, and thereafter, the integrated value Si is integrated every 0.5 seconds in the same manner. If it is determined in step 1107 that the integrated value Si has reached the target integrated value S ₀ , the relay 32 is turned off in step 1109, and after waiting for 30 seconds in step 1110, the process returns to step 1101. The same flow is executed thereafter.

This power control will be described with reference to FIG. 7. The detected voltage value V ₃ is multiplied every 0.5 seconds, and the integrated value Si is the target integrated value S represented by the area of the shaded portion in the figure. At time A when it reaches ₀ , the power supply to the heater 4 is stopped. Then, if the voltage fluctuates high in the next cycle after 30 seconds have elapsed, the integrated value Si reaches the target integrated value S ₀ at time B earlier than the time A, and the power supply to the heater 4 is stopped. If the voltage fluctuates low in the next cycle, the integrated value Si reaches the target integrated value S ₀ at the time when approximately 30 seconds have elapsed, and the energization of the heater 4 is stopped. With the above power control, the target power consumption (1020 W) smaller than the rated power consumption (1200 W) is controlled, so even if the commercial power source 30 has a voltage or current fluctuation, the power consumption of the heater 4 does not fluctuate. The heating by the heater 4 is constantly performed, and the temperature rise rate described later can be accurately measured.

Dishes amount determination While the power control is being performed, in step 1002 of FIG. 5, the washing initial temperature Y previously detected by the temperature sensor 22 and stored in the control device before the water supply is taken in. .. Then, in step 1003, the timer measures the temperature rise time X indicating the temperature rise rate until the water temperature of the wash water rises from 40 ° C. to 50 ° C. during washing. It should be noted that instead of showing the temperature rise rate by this temperature rise time, it may be shown by the temperature rise rate after a certain time. Then, in step 1004, the temperature rise time X and the initial cleaning temperature Y are input, and the amount Z of dishes stored in the cleaning tank 2 is output by fuzzy reasoning.

In this fuzzy inference, as shown in FIGS. 9 to 11, in advance, the membership function corresponding to each of the fuzzy sets of the temperature rise time, the initial washing temperature, and the dish quantity is defined. There is. That is, as shown in FIG. 9, the temperature rise time is divided into four stages of extremely short (E), short (S), medium (M), and long (L), and each membership function has a triangular shape. It is shown as a function. As shown in FIG. 10, the initial cleaning temperature is divided into three stages of low (L), medium (M), and high (H), and each membership function is shown by a triangular function. .. Similarly, as shown in FIG. 11, the tableware amount is also divided into 6 levels, such as 0 person, 1 person, ..., 5 person, and each membership function is shown by a triangular function. There is.

Fuzzy rules shown in Table 1 are defined between the membership functions. For example, in rule 4, if the temperature rise time is S and the initial washing temperature is L, then the amount of dishes is one person, and in rule 6, even if the temperature rise time is S, the initial washing temperature is H. And This is because, as shown in Table 2, even when the amount of dishes is the same, the temperature rise time changes depending on the initial temperature of washing, that is, the temperature in the refrigerator. Table 1 Rule Temperature rise time X Initial washing temperature Y Tableware quantity Z 1 E L 0 2 E M 0 3 E H 3 4 S L 1 5 S M 2 6 S H 4 7 M L 3 8 M M 4 9 MH 5 10 L L 4 11 L M 5 12 L H 5

Table 2 Tableware amount Z Temperature rise time X Initial washing temperature Y 0 E L 0 E M 1 S L 2 S M 3 E H 3 M L 4 S H 4 M M 4 L L 5 M H 5 L M 5 L H

In this way, under the defined membership function and fuzzy rule, as shown in FIG. 8, first, in step 1201, the temperature rise time E, S, M, L with respect to the input value X of the temperature rise time is first. The respective degrees XE, XS, XM, and XL are calculated. Next, at step 1202, the degree YL, YM. YH is calculated. Then, in step 1203, the smaller value Zf of the temperature rise time and the degree of the initial temperature of washing is taken for each fuzzy rule, and the membership function of the corresponding dish amount is truncated by this value of Zf. Fuzzy output is calculated. After that, in step 1204, the center of gravity position G from the reference point of the area sum of the membership function of the tableware amount for the truncated 0 to 5 people is obtained, and the tableware amount corresponding to this center of gravity position G is obtained. Is obtained, and the defuzzified output value Z is output.

Next, on the basis of the tableware amount Z output by this fuzzy inference, the washing condition of the subsequent process is set in step 1005 of FIG. Here, the set conditions are, as shown in FIG. 12, the number of times of cold water rinsing and the drying time, which are set in advance corresponding to the amount of dishes. The cleaning time of this cleaning step may also be determined at this time.

The determination of the amount of dishes and the setting of the washing conditions by the above fuzzy inference will be described more specifically. As shown in FIGS. 13 and 14, it is assumed that the temperature rise time is X ₁ between 330 seconds and 360 seconds and the initial cleaning temperature is Y ₁ between 10 ° C. and 20 ° C. First, from the membership function of the temperature rise time, XE = XL = 0, XS = 0.7, and XM = 0.3 are obtained. Further, from the membership function of the initial temperature of cleaning, YL = 0. 2, YM = 0.8 and YH = 0 are obtained.

Next, according to the fuzzy rules of Table 1, as the degree of each amount of tableware, one for rule 4 is 0.2, two for rule 5 is 0.7, and three for rule 7 is 0. 2, rule 8 gives 0.3 for 4 and all other rules get 0. Then, as shown in FIG. 15, the membership function of the tableware amount is truncated at each of these amounts, and a trapezoidal fuzzy output is obtained. The dish quantity Z ₁ corresponding to the position of the center of gravity G 1 of the area sum of this fuzzy output is obtained as a defuzzified output value. Based on the tableware amount Z ₁ , as shown in FIG. 12, the number of cold water rinses is set to 3 and the drying time is set to 12 minutes in the standard course and 17 minutes in the low temperature course.

Cold water rinsing After the above washing process is completed, as shown in steps 105 to 107 of FIG. 4, a cold water rinsing process including water supply, washing and drainage is set based on the amount of tableware by the fuzzy inference. It is done only a number of times. In the cleaning in step 106, heating by the heater 4 is not performed, but the cold water supplied is performed for 1 minute. Water supply in step 105 and drainage in step 107 are the same as those in the washing process. Hot water rinsing process In the hot water rinsing process, water is first supplied in step 108, the heater 4 is energized in step 109, and the washing pump 6 is driven to raise the water temperature to 70 ° C (50 ° C in low temperature fully automatic). Rinse with hot water until reaching and drain in step 110.

Drying In the drying process, first, the heater 4 is duty-controlled in step 111, and the fan motor 27 is activated to dry with warm air. This drying time is performed only for the time set in the washing process based on the amount of dishes by fuzzy reasoning. The warm air temperature is controlled to 70 ° C (50 ° C in low temperature full automatic). Next, in step 112, only the fan motor 27 is started, drying by cold air is performed for 5 minutes (3 minutes in low temperature full automatic), and in step 113 the power is cut off and this fully automatic course (low temperature full automatic course) Ends.

In the above embodiment, the voltage detection means 35 detects the rectified and smoothed voltage, but the current may be detected and integrated. It goes without saying that the present invention is not limited to the dishwasher as in the above-mentioned embodiment, but can be applied to an electric heating container such as an electric pot, a rice cooker, a tableware dryer, and a bread maker. Further, the heating means is not limited to the heater, but is also applicable to an electric heating container by electromagnetic induction heating.

[0029]

[Effect of the device]

 As is clear from the above description, according to the present invention, since the power consumption of the heating means is controlled to a predetermined power smaller than the rated power consumption, the heating means is controlled even if the commercial power source has a voltage or current fluctuation. The fluctuation of the power consumption is eliminated, the steady heating is performed, and the temperature rise rate is kept constant. Therefore, there is an effect that the control such as the capacity determination of the heating container is accurately performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a dishwasher.

FIG. 2 is a front view of an operation panel.

FIG. 3 is a circuit diagram of a power control device.

FIG. 4 is a flowchart of a fully automatic or low temperature fully automatic course.

FIG. 5 is a flowchart of a tableware amount determination routine.

FIG. 6 is a flowchart of a power control routine.

FIG. 7 is a diagram showing a change with time of a detection voltage V ₃ .

FIG. 8 is a flowchart of a tableware amount fuzzy inference routine.

FIG. 9 is a diagram showing a membership function of temperature rise time.

FIG. 10 is a diagram showing a membership function of a cleaning initial temperature.

FIG. 11 is a diagram showing a membership function of the amount of tableware.

FIG. 12 is a diagram for determining washing conditions based on the amount of dishes.

FIG. 13 is a diagram showing specific values of the membership function with respect to a certain value X ₁ of the temperature rise time.

FIG. 14 is a diagram showing specific values of the membership function for a certain value Y ₁ of the initial cleaning temperature.

FIG. 15 is a diagram showing a fuzzy output of a tableware amount with respect to a specific value of the membership function of FIGS. 13 and 14.

[Explanation of symbols]

4 ... Heater (heating means), 35 ... Control means, 38 ... Voltage detection means, 39 ... Switch means.

Claims (1)

[Scope of utility model registration request] 1. A power control device for an electric heating container for controlling the power consumption of a heating means to which an AC voltage is applied to a predetermined power set to be smaller than a rated power consumption, a switch for turning on / off a current to the heating means. Means and a current or voltage detecting means for transforming the voltage to the heating means to rectify and smooth it, and detect the smoothed current or smoothed voltage, and the current or voltage detected by the current or voltage detecting means at regular time intervals. And a control means for operating the switch means to turn off the current to the heating means when the integrated value reaches the target integrated value. .