JPH08112195A - Cooking appliance - Google Patents

Abstract

PURPOSE: To provide a cooking appliance by which the temperature distribution of a cooking object can be improved and cooking can be performed according to preset heating output. CONSTITUTION: A high frequency current is supplied to a heating coil 7 from an inverter circuit 8, and the heating coil 7 is constituted so as to perform induction heating on a pan 6. The inverter circuit 8 changes electric power to be supplied to the heating coil 7 by a control means 12, and controls heating output of the heating coil 7. (15 to 18) are switches, and a user inputs the desired cooking content according to the cooking content. (13) is a temperature detecting means to detect a temperature of the pan 6. A heating output determining means 9 determines reference heating output by using input of the switches 15 to 18 and a temperature by a temperature detecting means 13 as input. A chaos signal generating means 10 to generate a chaos signal outputs the chaos signal to an adding means 11, and changes the reference heating output of the heating output determining means 9 by the chaos signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooker for controlling heating output of a heating section.

[0002]

2. Description of the Related Art Conventionally, in order to improve the temperature distribution of an object to be cooked, the shape and material of the heating portion have been changed so that heat can be uniformly transferred to the entire object to be cooked. ,
Little has been done to control the heating output of the heating section to improve the temperature distribution of the food.

Techniques for controlling the heating output to improve the temperature distribution of the food to be cooked have already been proposed. The technique is shown in Japanese Patent Application No. 5-226955. The technique will be described below with reference to FIG.

In FIG. 10, reference numeral 1 designates a pan into which an object to be cooked is placed, and a magnetic force generating coil for heating the pan 1 by electromagnetic induction is arranged below the pan 1. A high frequency current is supplied to the magnetic force generating coil 2 from a high frequency current generating circuit 3. The high-frequency current generation circuit 3 is connected to the output control circuit 4 that changes the amount of current, that is, changes the amount of power of the magnetic force generation coil 2 according to the output control circuit 4. Reference numeral 5 denotes a chaotic signal generating circuit for generating a chaotic signal, which changes the output of the output control circuit 4 by the chaotic signal.

The basic characteristic of the chaotic signal has a trajectory such as a Paikone transformation, and has orbital instability such that it does not have the same state twice. Therefore, when the magnetic force generating coil 2 is operated in the cooker having the above-mentioned configuration, the magnetic force generating coil 2
The output of changes according to the chaotic signal,
It is possible to constantly change the amount of heat conduction and the convection path to the cooking object such as the pan 1 and water in the pan 1. In addition, the change of heat is not regular and changes due to the chaotic signal with orbital instability, so that the paths of heat conduction and convection also change. Therefore, the temperature in the pan 1 can be made uniform and uneven cooking can be suppressed.

[0006]

However, in the cooker having the above-mentioned structure, the heating output of the magnetic force generating coil 2 can be changed according to the chaos signal, but the heating output can be changed according to the preference of the user. I can't. In detail, the cooker has a function that allows the user to set the heating output such as strength and weakness according to the content of cooking, and when the heating output is set,
After that, it is necessary to perform heating and cooking with the set power, but there was a problem that heating and cooking according to the above set power could not be performed simply by changing the heating output with the chaotic signal as described above. .

In fried food cooking, etc., it is common for the user to set the temperature according to the food to be cooked, etc., and even in such a cooking course, the heating output is changed by the chaos signal. However, there is a problem that cooking cannot be performed while keeping the set temperature just by performing the cooking.

In view of the above problems, the present invention enables cooking according to the set heating output even if the heating output is changed in order to improve the temperature distribution of the object to be cooked. The first object is to perform uniform heating and cooking regardless of the temperature.

A second object is to enable heating and cooking to maintain the set temperature even if the heating output is changed in order to improve the temperature distribution of the object to be cooked.

A third object is, in addition to the second object, to prevent a decrease in load detection accuracy by prohibiting a change in heating output due to a chaotic signal under a predetermined condition.

[0011]

A first object of the present invention for achieving the above first object is to provide a heating unit for heating an object to be heated such as a pan for containing an object to be cooked, and the heating. Heating output input means for setting the heating output of the unit, chaos signal generating means for generating a chaos signal, heating output synthesizing means for changing the heating output input to the heating output input means by the chaos signal, and the heating And a control unit for controlling the heating output of the heating unit according to the output of the output combining unit.

A second means for solving the problems of the present invention for achieving the above-mentioned second object is to set a heating section for heating an object to be heated such as a pan for containing the object to be cooked and a target temperature of the heating section. Target temperature input means, a temperature detection means for detecting the temperature of the object to be heated, a heating output calculation means for calculating a reference heating output based on the outputs of the target temperature input means and the temperature detection means, and a chaos signal. Generating chaos signal generating means, heating output synthesizing means for changing the reference heating output calculated by the heating output calculating means by the chaos signal, and controlling the heating output of the heating unit according to the output of the heating output synthesizing means And a control means for controlling the operation.

A third problem solving means of the present invention for achieving the third object is that the heating output synthesizing means in the second problem solving means has a temperature detected by the temperature detecting means and a target temperature inputting means. The configuration is such that the synthesis of chaotic signals is prohibited based on the difference in the target temperature input to.

[0014]

According to the configuration of the first problem solving means, the object to be heated is heated by changing the heating output input to the heating output input means by the chaos signal. Therefore, heat can be conducted in the object to be cooked and the convection path can be irregularly heated, and the object to be cooked can be uniformly heated.

According to the configuration of the second problem solving means,
The heating output calculating means calculates the reference heating output so as to maintain the set target temperature, and the heating output change by the chaos signal is obtained based on the determined reference heating output. Therefore, it is possible to perform the heating cooking that maintains the set temperature while changing the heating output in order to improve the temperature distribution of the object to be cooked.

According to the configuration of the third problem solving means,
The heating output synthesizing means prohibits a change in heating output due to a chaotic signal based on the difference between the target temperature and the actual detected temperature. Therefore, the fluctuation of the detected temperature due to the chaos signal does not occur, and the temperature decrease due to the new addition of the food to be cooked can be detected, and the decrease in load detection accuracy can be prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 6 denotes a pan (object to be heated) into which an object to be cooked is placed, and a heating coil 7 is arranged below the pan 6.
A high-frequency current is supplied to the heating coil 7 from the inverter circuit 8, and the heating coil 7 induction-heats the pot 6. The inverter circuit 8 changes the electric power supplied to the heating coil 7 by the control means 12 to control the heating output of the heating coil 7. Reference numerals 15 to 18 are switches, which are input means for the user to input desired cooking contents according to the cooking contents, and 13 is a temperature detecting means for detecting the temperature of the pot 6.
The heating output determining means 9 determines the heating output by using the inputs from the input means 15 to 18 and the temperature from the temperature detecting means 13 as inputs. Reference numeral 10 denotes a chaos signal generating means for generating a chaos signal, which outputs the chaos signal to the adding means 11. The adding means 11 is a so-called heating output synthesizing means for changing the heating output of the heating output determining means 9 by a chaos signal. The control unit 12 controls the heating output by the heating output from the adding unit 11.

Next, an example of the chaos signal generating means 10 will be described. As an example of a function for generating a chaotic signal, there is a function shown below.

F (X) = 2 × X (0 ≦ X <0.5) F (X) = 2 × (1−X) (0.5 ≦ X ≦ 1) The graph of FIG. Becomes A method of generating a chaotic signal will be described with reference to the graph of FIG. That is, when the initial value A is calculated as the X value of F (X),
F (X) = X1. This X1 is calculated again as the X value of F (X). The result is F (X) = X2, and this X2 is calculated again as the X value of F (X), and F (X) = X
3 results are obtained. Repeating the above calculation N times,
X1, X2, X3 ... X (N) can be obtained. That is, X (n) obtained by repeating the above calculation
Is known to change chaotically, and its data X (n) can be used as a chaotic signal.

A specific structure will be described with reference to FIG. FIG.
In the figure, 30 is an initial value input means, which outputs the initial value A as an X value to the function operation means 31. The function calculation means 31 calculates the function F (X) with X = A, and outputs the calculation result as a chaotic signal. The calculation result of the function calculation means 31 is stored in the storage means 32, and the stored value is input again as the X value of the function calculation means 32. Reference numeral 33 is an occurrence count comparison means, which stops the operation of the function calculation means 31 when the number of times calculated by the function calculation means 31 reaches a predetermined value.

The operation of the chaos signal generating means will be described with reference to FIG. First, n = 0, the initial value X0 of the function F (X)
Is A and the initial value of the number of times N is B (steps 41 to 4).
3). Next, F (X) is calculated, and the calculation result is stored as the X value of the next F (X), that is, Xn + 1 (step 44). Next, the value of n is incremented by 1 (step 4
5) It is determined whether or not this n value has reached the initially set number of times N (step 46). If not reached, steps 44 to 46 are repeated, and if reached, the program ends.

The chaos signal of the above chaos signal generating means changes as shown in FIG. 5, and if the heating output is controlled by using this chaos signal, the heat generated when the heating unit heats the food to be cooked in the pan is increased. Although the conduction and convection paths are changed, the chaotic signal does not have the same state as that of the second time, so there is orbital instability. The temperature inside the pan can be made uniform.

In the above chaotic signal generating means, the function F
Although (X) is used, other than this function, a function capable of generating a chaotic signal, for example, Bernoulli function may be used, or a chaotic signal may be generated by an electric circuit, that is, a chaotic signal can be generated. Anything will do.

Next, a specific circuit configuration of the cooking device will be described with reference to FIG. In the figure, an inverter circuit 8 is composed of a rectifier for full-wave rectifying an AC power supply, a smoothing capacitor, a current limiting inductance, a resonance capacitor, a switching element, etc. A high-frequency current is passed through. The control means 12 turns on and off the switching elements in the inverter circuit 8 so that the oscillation frequency in the inverter circuit 8 can be varied. That is, the control means 12
Changes the oscillation frequency in the inverter circuit 8 to control the heating output of the heating coil 7.

The microcomputer 19 inputs the signals of the respective input means 15 to 18 from the input ports I1 to I4, inputs the signal of the temperature detecting means 13 from the input port AD1 for analog / digital conversion, and controls the control means 12. The control signal is output from the output port O1. The microcomputer 19 constitutes the heating output determining means 9, the chaos signal generating means 10, and the adding means 11 shown in FIG. Reference numeral 20 in FIG. 6 denotes a DC power supply circuit that supplies power to a circuit such as the microcomputer 19 that requires a DC power supply.

The input means 15 is a switch for starting heating and cooking at a heating output designated by the user, and the input means 16 is a switch for starting heating and cooking at a temperature designated by the user. The input means 17 and the input means 18 are switches for the user to input the heating output or the target temperature, and correspond to the heating output input means and the target temperature input means, respectively. If there is an input from the input means 17, the heating output or the target temperature is increased by one step, and if there is an input from the input means 18, the heating output or the target temperature is decreased by one step. Input means 1
By operating the input means 17 and the input means 18 after the start of cooking with No. 5, for example, from weak (150 W) to strong (12 W).
The heating output of 6 steps up to 00 W) can be input, and the target temperature of 6 steps from 150 ° C. to 200 ° C. can be input by operating the input means 17 and the input means 18 after the start of cooking by the input means 16. .

Next, the operation of the heating output determining means 9 will be described for each cooking mode. First, the case where heating and cooking are performed at the heating output designated by the user will be described. The user turns on the input circuit 15 to start cooking. At this time, the heating output determination means 9 outputs the initially set heating output strength (1200 W). After that, each time the switches of the input means 17 and the input means 18 are pressed, the heating output is changed by one step and output.

Next, the case where the cooking is performed at the temperature designated by the user will be described. The user turns on the input means 16 to start cooking. At this time, the initially set target temperature is 180 ° C., and the heating output determination unit 9 calculates the heating output by inputting the temperature of the pot by the temperature detection unit 13, the temperature gradient, and the target temperature. After that, each time the switches of the input means 17 and the input means 18 are pressed, the target temperature is changed by one step. In this cooking mode, the predetermined time t
The heating output determination means 9 calculates the heating output for each 0. When the temperature obtained by subtracting the pot temperature from the temperature detecting means 13 from the target temperature is a predetermined value, for example, 20 ° C or higher, the heating output determination means outputs the maximum output of 1200 W, and when the temperature is lower than 20 ° C, the reference heating output is obtained by fuzzy reasoning. To calculate.

The calculation can be performed using, for example, fuzzy inference. The inference rule is shown in FIG. That is, "if the deviation is N (negative) and the inclination is N (negative), the power (reference heating output) is set to w1" ... "If the deviation is Z (zero) and the inclination is Z (zero), the power ( There are nine rules: "Set reference heating output) to w5" ... "If deviation is P (positive) and inclination is P (positive), set power (reference heating output) to w9". "Deviation is N (negative)""Slope is P (positive)"
Such a qualitative expression is quantified by the membership function shown in FIG. The deviation used as an input is the target temperature minus the temperature of the pan by the temperature detecting means 13, and the slope is the amount of change in the pan temperature by the temperature detecting means 13 during a predetermined time dt, from w1 to w9. Is a real value representing the heating output. This cooking mode is a cooking mode used when cooking at a constant temperature, such as fried food cooking. In this way, the heating output determination means 9 is heated to a predetermined initial temperature, for example, oil to 180 ° C. Along with the heating, the load output, for example, the temperature drop due to the croquette being put into the oil is detected, and the heating output for cooking at the target temperature is determined.

Next, the operation of the adding means 11 will be described for each cooking mode. First, description will be given of a case where heating and cooking are performed with a heating output set by the user. The user turns on the input means 15 to start cooking. When the heating output determination means 9 determines the heating output W1, the addition means 11
Adds the chaotic signal from the above-mentioned chaotic signal generating means 10 to the heating output W1 determined by the heating output determining means 9 and outputs it. As described above, the chaotic signal K generated by the chaotic signal generating means 10 has a magnitude of 0 to 1. The output W of the adding means 11 is, for example, W = W1 + W1 * 0.6 * (K-0.5), so that the heating output W1 is at the center of the width W1 of 60% as shown in FIG. You can get an output with fluctuations.

Next, description will be made on the case where the cooking is performed at the temperature set by the user. The user turns on the input means 16 to start cooking. The heating output determining means 9 determines the heating output W2 based on the deviation T which is the difference between the target temperature and the temperature measured by the temperature detecting means 13 and the temperature gradient dT. The output W of the adding means 11 is, for example, W = W2 + W2 * 0.3 * (K-0.5) (T> 10 ° C.) W = W2 (T ≦ 10 ° C.). When the deviation T is small, it means that the oil is close to the target temperature when cooking fried food,
That is, it is necessary to cope with the load application such as croquette. However, when the heating output is fluctuated by the addition of the chaos signal in this region, the temperature of the pan bottom detected by the temperature detecting means 13 changes under the influence of the fluctuation, so that the load changes when the load is turned on. The detection accuracy becomes low.
Therefore, when the deviation T is sufficiently small, the detection accuracy of load detection is improved by not adding the chaotic signals. When the deviation T is large, the heating output has an appropriate fluctuation in the vicinity of W2, thereby irregularly changing the oil convection path,
The temperature in the pan can be made uniform.

Although the induction heating type cooker is shown in each of the above-described embodiments, heat conduction can be achieved by changing the heating output by a chaos signal even if an ordinary heater is used instead of the induction heating type heating coil. Convection can be made uniform and cooking performance can be improved.

As a method of changing the heating output by using the heater, duty control, phase control of changing the heater energization amount, or the like can be considered.

[0034]

As is apparent from the above description of the embodiments,
According to the invention of claim 1, since the heating output inputted to the heating output input means is changed by the chaos signal to heat the object to be heated, the temperature distribution of the object to be cooked can be improved, and Since the heating output is changed in the vicinity of the heating output set by the heating output input means, it is possible to prevent the completion of cooking from changing due to fluctuations in the strength of the heating output.

Further, according to the invention of claim 2, the heating output calculating means calculates the reference heating output so as to maintain the set target temperature, and the heating output change by the chaos signal is based on the determined reference heating output. With this configuration, it is possible to improve the temperature distribution of the food to be cooked, and also to perform the heating cooking that maintains the set temperature.

Further, according to the third aspect of the present invention, the accuracy of load detection can be prevented from being lowered by prohibiting the change of the heating output due to the chaos signal under the predetermined condition.

[Brief description of drawings]

FIG. 1 is a block diagram of a cooker showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a function for generating a chaotic signal.

FIG. 3 is a block diagram of a chaos signal generating means.

FIG. 4 is a flowchart showing the operation of the chaotic signal generating means.

FIG. 5 is an output waveform diagram of the chaos signal generating means.

FIG. 6 is a circuit diagram of a cooker showing a first embodiment of the present invention.

FIG. 7 is a diagram showing a fuzzy inference rule of a heating output determination determining means.

FIG. 8 is a diagram showing a fuzzy inference membership function of the heating output determination means.

FIG. 9 is a diagram showing a heating output to which a chaos signal is added.

FIG. 10 is a block diagram of a cooking device showing a conventional example.

[Explanation of symbols]

 7 Heating Coil (Heating Section) 8 Inverter Circuit 9 Heating Output Determining Means 10 Chaotic Signal Generating Means 11 Adding Means (Heating Output Combining Means) 12 Control Means 13 Temperature Detecting Means 19 Microcomputer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masafumi Sadahira, Inventor, 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Naofumi Nakatani, 1006, Kadoma, Kadoma, Osaka Pref. 72) Inventor Ikuko Kai 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A heating unit for heating an object to be heated such as a pan, a heating output input unit for setting a heating output of the heating unit, a chaos signal generating unit for generating a chaos signal, and the heating by the chaos signal. A cooker comprising: a heating output synthesizing unit that changes the heating output input to the output input unit; and a control unit that controls the heating output of the heating unit according to the output of the heating output synthesizing unit. 2. A heating section for heating an object to be heated such as a pan, a target temperature input means for setting a target temperature of the heating section, a temperature detecting means for detecting the temperature of the heating section, a target temperature input means and a temperature. Heating output calculation means for calculating a heating output based on the output of the detection means, chaos signal generation means for generating a chaos signal, and heating output combination for changing the heating output calculated by the heating output calculation means by the chaos signal. Means and
A cooking device comprising: a control unit that controls the heating output of the heating unit according to the output of the heating output synthesizing unit. 3. The heating output synthesizing means is configured to prohibit synthesizing with a chaotic signal according to a difference between the temperature detected by the temperature detecting means and the target temperature input to the target temperature input means. Cooking device.