JP2956287B2 - Heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for heating food stored in an oven.

[0002]

2. Description of the Related Art Conventionally, this type of heating apparatus has a different heating method for each cooking menu. For example, "meat pickling" is heated by a method as shown in FIG. That is, the temperature detecting means (not shown) for detecting the temperature in the oven detects the internal temperature level a at the start of cooking and the lowest temperature level b of the oven internal temperature during cooking.
The detection level y is calculated as y = K0 · (L−a) + b. Then, the time T1 from the start of cooking until the detection level y is reached is measured, and after reaching the detection level y, cooking is performed in the time of K · T1 + TC. Here, during the time T1 + K · T1, the temperature TEMP1
To control a heater (not shown), and during the time TC, the temperature T
Cooking was controlled by controlling the heater with EMP2.

[0003]

In such a conventional heating device, the cooking time depends on the time T1 (hereinafter referred to as T1 time) until the detection level y is reached. For example, the amount of food is large. When the T1 time is large, when the food temperature is high, the T1 time is small, when the outside temperature is low, the T1 time is large, when the initial temperature in the refrigerator is high, T1 is small, When it has decreased, the T1 time has increased, and there has been a problem that the overall cooking time T1 + K.T1 + TC is not always an appropriate cooking time. As described above, the amount of food, the food temperature, the outside air temperature, the initial temperature in the refrigerator, and the voltage of the commercial power supply are important points for determining the cooking performance in oven and grill cooking.

[0004] The present invention has been made to solve the above-mentioned problems, and has as its object to prevent the cooking performance from being lowered even if the amount of food, the food temperature, the outside air temperature, the initial temperature in the refrigerator, or the voltage of the commercial power supply changes. I have.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to an oven for storing food, heating means for heating the food, first temperature detecting means for detecting the temperature in the oven, and a vicinity of the heating means. And a second temperature detecting means attached to the outside of the oven, and a control means for inputting an output of the first and second temperature detecting means and controlling an operation of the heating means, wherein the control means comprises: When a detection level determined using the detection level of the first temperature detection means at the time of starting cooking and the lowest point level of the first temperature detection means during cooking is reached,
A cooking time period based on a time required for the first temperature detection means to reach the detection level, and a cooking time calculated by the second temperature detection means based on a value calculated from a rise level at a fixed time after the start of cooking from the start of cooking; Is determined.

[0006]

According to the present invention, the cooking performance does not decrease even if the amount of food, the food temperature, the outside air temperature, the initial temperature in the refrigerator, and the voltage of the commercial power supply change.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in the drawing, a first thermistor (first thermistor)
Temperature detecting means) 1 detects the temperature inside the oven 2, a second thermistor (second temperature detecting means) 3 is attached to the outside of the oven 2, and a heating value of a heater (heating means) 4 Are detected, and the sensor circuit 5,
The microcomputer 6 is connected to a microcomputer (control means (hereinafter, referred to as a microcomputer)) 7 through 6. Constant voltage generator 8
Is connected to a commercial power supply 9 via a low-voltage transformer 10 and supplies a voltage to the microcomputer 7. The display device 11 displays a cooking method such as “strong cooking range” or “oven cooking”, a cooking menu such as “cookie” or “teriyaki fish”, a cooking time, a heating temperature, and the like. Relay 12 is microcomputer 7
To turn on the relay contact 13 to energize the heater 4. The input means 14 includes a start switch 14a for instructing the start of cooking, a cancel switch 14b for instructing interruption of cooking and the like, and a switch group 14c for selecting and instructing a cooking method and a cooking menu.
The magnetron 15 drives the drive circuit 1 based on the output of the microcomputer 7.
6 to operate. The microcomputer 7 is programmed in advance with a heating pattern corresponding to each cooking method and a cooking menu. FIG. 3 shows a heating pattern of “meat pickling and grilling” as an example of the cooking menu.

The operation of the above configuration will be described. First, when "meat pickling and grilling" is selected by the switch group 14c and the start switch 14a is input, the microcomputer 7
Outputs an active signal to excite the relay 12, turns on the relay contact 13 and energizes the heater 4. At the same time, the microcomputer 7 reads the temperature level ai in the oven 2 detected by the first thermistor 1 and reads the calorific value level ci of the heater 4 detected by the second thermistor 3, and the first RAM 7a and the first RAM 7a of the microcomputer 7 respectively. 2R
Store it in AM7b. Simultaneously with the start of cooking, the microcomputer 7 operates a timer (not shown) and counts the time Tsam to read the level di of the calorific value of the heater 4 detected by the second thermistor 3. Is stored in the second RAM 7b. Further, the lowest point level bi in the oven 2 after the start of cooking detected by the first thermistor 1 is read, and the detection level yi = K0 (L-ai) + bi is determined in the first R.
Store it in AM7α. Here, K0 and L are determined for each cooking menu, and are stored in the ROM section of the microcomputer 7.

When the detection level of the first thermistor 1 becomes yi, the counter (not shown) of the microcomputer 7 operating at the same time as the start of cooking is interrupted and the detection time T1 is reached.
And the microcomputer 7 sets the subsequent cooking time to α · K1 · T1 +
Calculate as TC. Here, α is determined from the rising level Zi of the thermistor 2 and the detection time T1 of the thermistor 1 for each cooking menu, and is stored in the ROM section of the microcomputer 7 as shown in FIG. The method for determining the constant α will be described later. Here, time (1 + α · K1) · T1 + TC is T
In EMP1, the time TC controls the inside of the oven 2 in TEMP2, and K1, TC, TEMP1, and TEMP2 are determined for each cooking menu and stored in the ROM section of the microcomputer 7.

The constant α is a constant that can cope with various conditions of the environment and food so that cooking can be performed without failure. The method of determining the constant α will be described below with reference to FIGS. As shown in FIG. 5, the first fuzzy inference device 1
Reference numeral 6 denotes a rising level (ai) of the second thermistor 17, and a first characteristic quantity (b) indicating the quantity (large or small) of the food.
i), a second characteristic quantity (ci) indicating the temperature of the food (high or low), a third characteristic quantity (di) indicating the outside air temperature (low or high), and the initial temperature in the refrigerator (low or high). ) Is input, and the time until the first thermistor detects the detection level y, that is, T1 time (Xi)
23 is output. The second fuzzy inference device 22 receives the same input as the first fuzzy inference device 16 and outputs an optimal T1 time (Yi) 24 for realizing optimal cooking.

The first fuzzy inference device 16 receives the input (a
i) 17, (bi) 18, (ci) 19, (di) 2
0, (ei) The fuzzy inference is used to calculate the optimal output value based on the first fuzzy rule 25 according to the membership function of the membership function, and the result is defuzzified to output the T1 time (xi) 23. I do. The second fuzzy inference device 22 inputs (ai) 17, (bi) 18, (c)
i) The optimal output value based on the second fuzzy rule 26 is calculated by fuzzy inference according to the degree of fitness of the membership functions of 19, (di) 20, and (ei) 21, and the result is defuzzified to be optimal. The T1 time (yi) 24 is output. The first fuzzy rule 25 is input (ai) 1
7, (bi) 18, (ci) 19, (di) 20, (e)
i) The value of 21 is set as the antecedent part, and the output (xi) 23 is set as the consequent part. The second fuzzy rule 26 includes the input (ai) 17, (bi) 18, (ci) 19, di)
20, the value of (ei) 21 is set as the antecedent part, and the output (yi) 2
4 is the consequent part. The membership functions configured in the first fuzzy inference device 16 include inputs (ai) 17, (bi) 18, (ci) 19, and (di).
20 and (ei) 21 are used to fuzzify the operation result and to defuzzify the operation result into a specific output (xi) 23. The membership function configured in the second fuzzy inference device 22 is composed of the input (ai) ) 17, (bi) 18,
(Ci) 19, (di) 20, and (ei) 21 are used for fuzzy processing, and the operation result is defuzzified to a specific output (yi) 24.

The membership function of the fuzzy controller 30 and the first fuzzy rule 25 and the membership function of the fuzzy controller 31 and the second fuzzy rule 26 are created by the steepest descent method using the data shown in (Table 1).

[0014]

[Table 1]

In Table 1, S, M, and B are:
In each of the parameters (ai to di), S means a relatively small value, M means a standard value, and B means a relatively large value. This method is described in detail in Ichikawa and Watanabe, "Learning-type Control by Fuzzy Model Using Simplified Fuzzy Inference", Journal of Fuzzy Society of Japan, 1990, 8.

According to the above system, the input (ai) 1
7, (bi) 18, (ci) 19, (di) 20, (e)
i) A constant αi (= yi / xi) 29 is determined for 21. Therefore, when ai is fixed to a1 and the data is fixed to bi, (ci, di, ei) = (c1, d1, e1), (c
1, d1, e2), (c1, d1, e3), (c1, d
2, e1), (c1, d2, e2) to (c3, d3, e)
2) The center of gravity calculation of (c3, d3, e3) is performed to approximate as shown in FIG. FIG. 3 shows a result obtained by performing this calculation for all input (ai, bi, ci, di, ei) regions and compiling the range without any hindrance to cooking performance. This value is stored in the microcomputer 5 as a ROM. That is, as shown in the data of FIG. 5 and the change of the conditions bi, ci, di, and ei as shown in FIG. 6, the center of gravity is calculated, the constant αi is calculated, and the optimal T1 time is calculated as
As 1, the cooking time after the T1 time is determined.

[0017]

As is apparent from the above embodiments, according to the present invention, an oven for storing food, a heating means for heating the food, and a first means for detecting the temperature in the oven.
Temperature detecting means, near the heating means and in the oven
A second temperature detecting means attached to the outside, the first and second temperature detecting means;
Control means for inputting the output of the temperature detecting means and controlling the operation of the heating means, wherein the control means detects a detection level of the first temperature detecting means at the time of starting cooking and the first level during cooking. When the temperature reaches the detection level determined using the lowest point level of the temperature detection means, the time until the first temperature detection means reaches the detection level, and the time from when the second temperature detection means starts cooking Since the subsequent cooking time is determined using the value determined by the rise level after a certain time after the start of cooking, the constant determined by the T1 time of the first thermistor and the rise level of the second thermistor is used. By determining the cooking time, cooking performance can be ensured regardless of various environmental conditions and food conditions. In addition, since control is performed using fuzzy inference, it is not necessary to experiment on all possible conditions, and the experiment can be rationalized.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a heating device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the heating device.

FIG. 3 is an operation time chart of the heating device.

FIG. 4 is a diagram showing constants for determining a cooking time of the heating device.

FIG. 5 is a block diagram showing a method of calculating a constant for determining a cooking time of the heating device.

FIG. 6 is a diagram showing a result of calculating a center of gravity after estimating a constant for determining a cooking time of the heating device.

FIG. 7 is an operation time chart of a conventional heating device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first thermistor (first temperature detecting means) 2 oven 3 second thermistor (second temperature detecting means) 4 heater (heating means) 7 microcomputer (control means)

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kimiaki Yamaguchi 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-64-23025 (JP, A) JP-A-2-2 44126 (JP, A) JP-A-3-5622 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24C 7/02 320 F24C 7/04 301

Claims (1)

(57) [Claims] An oven for storing food, a heating means for heating the food, a first temperature detecting means for detecting a temperature in the oven, and an external part near the heating means and outside the oven. A second temperature detecting means for detecting a calorific value of the heater, and a control means for receiving an output of the first and second temperature detecting means and controlling an operation of the heating means,
The control means, when reaching a detection level determined using the detection level of the first temperature detection means at the start of cooking and the lowest point level of the first temperature detection means during cooking, The cooking time after that is determined based on the time required for the temperature detecting means to reach the detection level and a value calculated from the rise level at a certain time after the start of cooking by the second temperature detecting means after the start of cooking. A heating device configured as described above.