JP2841922B2 - 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 detection means for detecting the temperature in the oven (not shown) detects the lowest temperature level b _i of the cooking starting inside temperature levels a _i, oven-compartment temperature during cooking, detection the level y _i is calculated as _{y i = K 0 × (L} -a i) + b i. Then, the detection level y _i from the start of cooking
The time T ₁ of the to reach measured, after reaching the detection level y _i had to be cooked in the time K × T ₁ + T _0. Here, the heater (not shown) is controlled at the temperature Temp ₁ during the time T ₁ + K × T ₁ , and the temperature Tem is controlled during the time T _0.
It had so as to control the heater cooking at p _2.

[0003]

In such a conventional heating device, the cooking time depends on the detection level y _i ,
For example, when the commercial power supply drops to around 90 V, the time T ₁ (hereinafter referred to as T ₁ time) until reaching the detection level y _i becomes longer than the T ₁ time when the commercial power supply is 100 V. Cooking time T ₁ + K × T ₁ + T
₀ had a problem that the cooking time was not always appropriate. As described above, for oven and grill cooking, the voltage of the commercial power supply, that is, the calorific value of the heater is a major point that determines the cooking performance.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to prevent the cooking performance from being reduced even when the amount of heat generated by a heater changes due to fluctuations in the voltage of a commercial power supply.

[0005]

In order to achieve the above object, the present invention provides an oven for storing food, a heating means for heating the food, and a first temperature detecting means for detecting a temperature in the oven. And the additional
Before detecting a temperature change due to a change in the calorific value of the heating means
A second temperature detecting means provided in the vicinity of the heating means, and a control means for inputting outputs of the first and second temperature detecting means and controlling an operation of the heating means, wherein the control means comprises:
A detection level of the first temperature detection means at the start of cooking;
From the detection level of the second temperature detection means, the lowest point level of the detection level of the first temperature detection means during cooking, and the detection level of the second temperature detection means for a certain time after the start of cooking. The problem solving means is that the heating time of the food is determined by fuzzy inference.

[0006]

According to the present invention, the cooking performance does not decrease even if the heating value of the heating means changes due to the fluctuation of the voltage of the commercial power supply.

[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 is a cooking method such as “strong range”, “oven cooking”, “cookie”,
A cooking menu such as "teriyaki fish", cooking time, heating temperature and the like are displayed. The relay 12 is excited by the output of the microcomputer 7 and turns on the relay contact 13 to turn on the heater 4.
Turn on electricity. 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 operates via the drive circuit 16 by the output of the microcomputer 7. 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 a temperature level a _i of oven 2 detected by the first thermistor 1, reads the calorific level c _i of the heater 4 detected by the second thermistor 3, respectively microcomputer 7 first 1RAM7a And the 3rd R
Store it in AM7c. Moreover, cooking at the same time as the start microcomputer 7 reads a calorific level d _i of the heater 4 detected by the second thermistor 3 at the time of counting the time Tsam operates a timer (not shown), and stores it in the first 4RAM7d . Further, the lowest point level in the oven 2 after the start of cooking detected by the first thermistor 1 is read and stored in the second RAM 7b.

[0010] When the data of these a _i ~d _i are aligned, as shown in FIG. 4
As shown, the data a _i to d _i is the 1R microcomputer 7
The signals are decoded from the AM 7a to the fourth RAM 7d, input to the fuzzy inference device 17, and the detection level y _i is output. Further, the counter (not shown) operating at the same time as the start of the cooking stops the operation when the detection level of the first thermistor 1 becomes y _i, and reaches the detection time T ₁ . Then, the subsequent cooking time is calculated as K × T ₁ + T ₀ .
Here, the time K × T ₁ is a time for controlling the temperature in the oven 2 with Temp ₁ , and the time T ₀ is a time for controlling the temperature in the oven 2 with Temp ₂ , and K, T ₀ , Temp ₁ , Temp ₂ is stored in advance in the ROM of the microcomputer 7 for each cooking menu.

[0011] Next, a method for determining the detection level y _i from the data a _i to d _i, be described with reference to FIG.

[0012] The input to the fuzzy inference device 17, the first thermistor 1 cooking start detection level a _i, the first lowest point level b _i of the thermistor 1 during cooking, the cooking start of the heater 4 level d _i of the second detection level c _i and cooking start time after the second thermistor 3 during Tsam course of the thermistor 3 for detecting the amount of heat generated, the fitness of the membership functions of the input a _i to d _i of Hey , An optimal output value based on the fuzzy rule 18 is calculated by fuzzy inference, the result is defuzzified and output as an actual detection level y _i . Fuzzy rules 18
The values of the inputs a _i , b _i , c _i , and d _i are used as the antecedent part, and the output y
_i is the consequent part. Also, inputs a _i , b _i ,
Fuzzify c _i and d _i . The membership function configured in the fuzzy controller 19 is used when defuzzifying the operation result to a specific output y _i . The fuzzy rule 18, a membership function configured in the fuzzy controller 19, was created by the steepest descent method using the data shown in (Table 1).

[0013]

[Table 1]

This is described in detail in Ichikawa and Watanabe, "Learning type control by fuzzy model using simplified fuzzy inference", Journal of the Japanese Fuzzy Society, 1990.8, and the like. In Table 1, L, M, and H are parameters (a
In _{i ~d i),} L is a relatively low value, M is a standard value, H is means a relatively high value.

[0015]

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, and a second means attached outside the oven.
Temperature detecting means, and control means for inputting outputs of the first and second temperature detecting means and controlling the operation of the heating means, wherein the control means detects the first temperature at the start of cooking. A detection level of the means, a detection level of the second temperature detection means, a lowest point level of the detection level of the first temperature detection means during cooking, and the second temperature detection for a certain time after the start of cooking. Since the heating time of the food is determined by fuzzy inference from the detection level of the means, the first temperature detecting means for detecting the temperature in the oven and the second temperature detecting means for detecting the calorific value of the heating means The cooking time is determined using the means, so that the cooking performance can be ensured regardless of the external condition such as the fluctuation of the voltage of the commercial power supply.In addition, since the control is performed using fuzzy inference, it is not necessary to test all possible conditions. May be It is rationalization of the experiment.

[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 block diagram showing a detection level calculation method of the heating device.

FIG. 5 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)

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takahiko Yamazaki 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-62-52324 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24C 7/04 301

Claims (1)

(57) [Claims] 1. An oven for storing food, heating means for heating the food, first temperature detection means for detecting a temperature in the oven, and a heating means for accommodating a voltage change of a commercial power supply.
Before detecting a temperature change due to a change in the calorific value of the heating means
A second temperature detecting means provided in the vicinity of the heating means, and a control means for inputting outputs of the first and second temperature detecting means and controlling an operation of the heating means, wherein the control means comprises:
A detection level of the first temperature detection means at the start of cooking;
From the detection level of the second temperature detection means, the lowest point level of the detection level of the first temperature detection means during cooking, and the detection level of the second temperature detection means for a certain time after the start of cooking. A heating device configured to determine a heating time of the food by fuzzy inference.