JPH0330782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cooking device, and more particularly, to a cooking device in which a cooking temperature for yeast fermentation cooking can be set.

<Prior art and problems to be solved by the invention> Conventionally, there has been a strong demand for multifunctionality in cooking appliances such as gas ovens, electronic ovens, and oven ranges. Temperature approx.
There are products that allow yeast fermentation cooking by setting the temperature to 35°C.

In order to select the cooking temperature, there is a temperature setting switch provided at the input of the microcomputer.

In the above cooker, among the cooking temperatures,
In particular, the set temperature for yeast fermentation cooking must be accurately set so as not to kill the yeast and to ensure sufficient fermentation.

By the way, in order to set the above temperature,
It is necessary to control the temperature by comparing the A/D value of the thermistor with the reference A/D value in the microcomputer program, but the resistance used in the thermistor circuit has variations in resistance. There were also variations in the thermistor, and due to the variation in the resistance and thermistor, the set temperature also varied by about ±5°C from the optimal set temperature of about 35°C.

However, this variation is too large for delicate cooking, such as yeast fermentation cooking, in which the quality of the product changes greatly with a small temperature difference, and there are cases where the cooking cannot be done properly.

On the other hand, in normal high-temperature cooking, it is better to set the temperature accurately, but even if the temperature setting is slightly inaccurate, you may be able to extend the heating time or Since you can easily check how well the food is cooking and turn off the heating, it can be said that delicately setting the temperature has little effect.

<Objective of the Invention> The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a cooking device that enables fine adjustment of the temperature for yeast fermentation cooking and thereby allows yeast fermentation to be performed optimally. The purpose is to

<Means for Solving the Problems> In order to achieve the above object, the cooking device of the present invention is capable of controlling the internal temperature of the cooking chamber in which the food to be cooked is stored over a wide range from high-temperature cooking to yeast fermentation cooking. The apparatus includes a cooking temperature setting means for setting a cooking temperature, and a set temperature fine adjustment means for finely adjusting the cooking temperature when the cooking temperature is set to the cooking temperature for yeast fermentation cooking.

<Function> With the above-configured cooking device, the internal temperature of the cooking chamber that stores the food to be cooked can be set over a wide range from high-temperature cooking to yeast fermentation cooking using the cooking temperature setting means. When the cooking temperature for yeast fermentation cooking is set by the temperature setting means, the cooking temperature can be finely adjusted by the set temperature fine adjustment means.

<Examples> Hereinafter, examples will be described in detail with reference to the accompanying drawings showing examples.

FIG. 5 is a longitudinal sectional view showing an embodiment of the cooking device of the present invention, and FIG. 6 is a horizontal sectional view.

In the figure, a cooking chamber 2 is provided inside an exterior body 1, and a door 1a that can be opened and closed closes a front opening of the cooking chamber 2.

A magnetron 3 for introducing high-frequency radio waves into the cooking chamber is attached to the upper plate 2a of the cooking chamber 2, and a circulation fan 4 is attached to the space 2b formed by curving the back plate outward. Furthermore, the combustion space 5a between the lower plate and the exterior body 1
Gas burner 5 is installed on the Further, the front side of the circulation fan 4 has an opening 6a in the center for allowing the circulation fan 4 to take in air, and an exhaust space (6) in the periphery between it and the back plate of the cooking chamber 2. As the circulation fan 4 rotates, air is sucked in from the opening 6a and air is discharged from the exhaust space 6c. This allows air to circulate inside.
Furthermore, a communication hole 5 is provided at a predetermined position on the back plate of the cooking chamber 2 (a predetermined position closer to the outside than the exhaust space 6c), which communicates the combustion space 5a with the internal space of the cooking chamber 2.
By forming b, combustion hot air obtained by igniting the gas burner 5 can be introduced into the cooking chamber 2 by the action of the air circulation flow. Furthermore, by forming an exhaust port 2c in the upper part of the space 2b, a part of the circulating air can be discharged from the cooking chamber 2 into the atmosphere.

In addition, 4a is a circulation motor for rotationally driving the circulation fan 4, 7 is a mounting table for placing the object to be heated, and 7a is a turntable mechanism for rotating the above-mentioned mounting table 7. , 3a is a control board for controlling the magnetron 3 etc.
8 is an operation panel, 8a is a control board for the operation panel, 9 is an interior light, and 10 is a thermistor.

FIG. 7 is a front view of the operation panel 8, in which a start switch 8b and a cancel switch 8c are installed on the rightmost side in two stages, upper and lower, and on the left side there are temperature controls over a wide range from high-temperature cooking to yeast fermentation cooking. Temperature adjustment knob 8d for setting, temperature fine adjustment screw 8u for finely adjusting the cooking temperature for yeast fermentation cooking, timer knob 8e
Install them in this order, and on the left side, install drying switch 8f, S switch 8g, defrost switch 8h, high speed range switch 8i, and weak microwave switch 8.
j, combination switch 8k, strong microwave oven switch 8m, and preheating switch 8n are installed in two stages, upper and lower, in this order.Furthermore, a numerical display 8p is installed on the left side, and a gas continuous switch is installed above the numerical display 8p. Install the indicator 8q and combustion indicator 8r, and put the brightness switch 8 on the leftmost side.
s and a time setting switch 8t are installed in two stages, upper and lower.

FIG. 1 is a block diagram showing an embodiment of the cooking device of the present invention, in which the voltage at the connection point between the resistor 12 and thermistor 10 is converted into a digital value by the A/D conversion circuit 13 and input to the microcomputer 11. , the variable terminal voltage of the fine adjustment variable resistor 14 is A/D
The conversion circuit 15 converts it into a digital value and inputs it to the microcomputer 11, and the digital value of the temperature adjustment knob 8d read by the rotary encoder 8J is input to the microcomputer 11.
The microcomputer 11 receives voltage signals from various menu switches such as the high-speed range switch 8i and the start switch 8b. If the cooking temperature set by the temperature control knob 8d is other than the cooking temperature for yeast fermentation cooking, the microcomputer 11 controls the temperature corresponding to the digital value input from the A/D conversion circuit 13. The cooking temperature is compared with the cooking temperature set by the temperature control knob 8d, a control signal is generated based on the comparison result, and the control signal is input to the combustion control circuit 16 to control the combustion state of the gas burner 5 and the type of cooking. The internal temperature of the cooking chamber 2 is maintained at the optimum temperature by controlling the cooking chamber 2 to an optimum state in accordance with the above conditions, so that good cooking can be carried out. Moreover, the microcomputer 11 is
When the cooking temperature set by the temperature control knob 8d is the cooking temperature for yeast fermentation cooking, the digital value input from the A/D conversion circuit 13 and the digital value input from the A/D conversion circuit 15 Compare the temperature corresponding to the sum of the above with the cooking temperature set by the temperature adjustment knob 8d, and generate a control signal based on the comparison result,
Similar to the above, the control signal is input to the combustion control circuit 16.

This method of adding digital values will be explained in detail. The A/D conversion circuit 13 includes a thermistor 1
For example, if a voltage of 0 is converted into a digital value using an 8-bit code, the digital value will be 0 to
Takes the value 256. On the other hand, the A/D conversion circuit 15 also
The cooking temperature set by the temperature control knob 8d is set to 8.
When digital conversion is performed using a bit code, the digital value takes a value from 0 to 256. A/D
The output digital value of the conversion circuit 15 is not directly added to the output digital value of the A/D conversion circuit 13, but the output digital value of the A/D conversion circuit 15 is multiplied by 1/n and added to the output digital value of the A/D conversion circuit 13. 13 is added to the output digital value. For example, if n=16 is fixed, the output digital value of the A/D conversion circuit 15 will take a value from 0 to 15, which is obtained by dividing each numerical value from 0 to 256 by 16. By adding this to the output digital value of the A/D conversion circuit 13, the output digital value of the A/D conversion circuit 13 corresponding to the voltage of the thermistor 10 can be finely adjusted in the range of 0 to 15. For example, if the output digital value of the A/D conversion circuit 13 is initially 180, this value 180 can be finely adjusted from 180 to 195 using the temperature fine adjustment screw 8u. In this way, the output digital value of the A/D conversion circuit 15, which corresponds to the voltage of the thermistor 10, is multiplied by 1/n and is added to the output digital value of the A/D conversion circuit 13. A control signal is generated by comparing the temperature with the cooking temperature set by the temperature control knob 8d, and the internal temperature of the cooking chamber 2 is finely adjusted by inputting the control signal to the combustion control circuit 16. We are making it possible to do so. As can be seen from the above explanation, the number n sets the range of fine adjustment, and the larger n is, the narrower the range of fine adjustment is, but the finer adjustment can be made.
The smaller the value, the wider the range of fine adjustment, but it becomes impossible to make fine adjustments.

FIG. 2 is a flowchart illustrating the operation of yeast fermentation cooking, in which a signal obtained by A/D converting the voltage between the terminals of the thermistor 10 is input to the microcomputer 11,
In step, it is determined whether the temperature set by the temperature setting knob 8d is the temperature for yeast fermentation cooking. If the temperature is determined to be suitable for yeast fermentation cooking, the fine adjustment variable resistor 14 is activated in a step.
A signal obtained by A/D converting the output voltage from the variable terminal of the thermistor 10 is input to the microcomputer 11, and in step
1/n of the D-converted signal and the A/D-converted signal of the output voltage from the variable terminal of the fine adjustment variable resistor 14
In the step, based on the addition result, the magnitude relative to the set temperature is determined, and the necessary determination and processing are performed thereafter. Further, if it is determined in the above step that the temperature is not suitable for yeast fermentation cooking, the determination and processing in the following steps are performed as is.

That is, when yeast fermentation is to be carried out, the value detected by the thermistor 10 is finely adjusted using the variable resistor 14.
It is possible to perform yeast fermentation cooking at an appropriate temperature based on the corrected value by 1/n of the adjusted value by It is possible to perform cooking at an appropriate temperature based only on the temperature.

FIG. 3 is a block diagram showing another embodiment,
The difference from the above embodiment is that a resistor 17 and a thermistor 10 are connected in series between the voltage V1 and the ground.
A variable resistor 18 is connected between the voltage V2 and the voltage V3, and a signal obtained by A/D converting the voltage at the connection point between the resistor 17 and the thermistor 10 by an A/D conversion circuit 19 is input to the microcomputer 11. The configuration of the other parts is the same.
Note that the above voltage is set so that V1≦V2<V3. Moreover, FIG. 4 is a diagram showing the voltage V0-temperature characteristics between the terminals of the thermistor 10, and a, b
indicate the characteristics corresponding to the fine adjustment upper limit value (the maximum value of the variable resistor 18) and the fine adjustment lower limit value (the minimum value of the variable resistor 18) by the variable resistor 18, respectively.

That is, the resistance value of the thermistor 10 is R _TH , the resistance value of the resistor 17 is R1, and the resistance value of the variable resistor 18 is R TH .
V _R is the resistance value of the resistor connected to the variable terminal of the variable resistor 18, and R2 is the variable terminal voltage of the variable resistor 18.
Vc, the voltage between the terminals of thermistor 10 is V0, and R2
>> Assuming that V _R , V0 = R _TH (R1Vc + R2V1) / (R1R2 + R2R _TH + R1R _TH ) = (R1Vc + R2V1) / (R1R2 / R _TH + R2 + R1). Here, the resistance value _RTH of the thermistor 10 increases exponentially as the temperature decreases, so R1R2/ _RTH becomes smaller, and when Vc is changed by a certain amount from the fine adjustment lower limit value to the fine adjustment upper limit value, ,
V0 will change significantly. Therefore,
On the other hand, if you want to keep V0 at a constant value V01, it is necessary to greatly change _RTH . This can be seen from the fact that the temperature of the thermistor 10, shown on the horizontal axis in FIG. 4, changes greatly in the range from T1 to T1'. Therefore, by adjusting the temperature adjustment knob 8d, the temperature of the thermistor 10 can be corrected over a wide range T1 to T1'. Next, thermistor 1
Since the resistance value R _TH of _{0 decreases exponentially as the temperature rises, R1R2/R TH increases} , and even if Vc changes by a certain amount, V0 hardly changes. Conversely, if you want to keep V0 at a constant value V02, you only need to change _RTH small, and this means that the thermistor 10 shown on the horizontal axis in Figure 4
This can be seen from the fact that the temperature changes small in the range from T2 to T2'. Therefore, temperature control knob 8d
Even if you adjust the temperature of the thermistor 10, it will remain within a narrow range.
Correction can only be made over T1 to T1'.

From the above, it is understood that the fine adjustment upper limit value and the fine adjustment lower limit value are considerably different in the low temperature range, as shown in FIG. 4, and exhibit almost equal characteristics in the high temperature range.

Therefore, in the case of this embodiment, when performing all cooking, the voltage obtained by correcting the terminal voltage of the thermistor 10 by the variable terminal voltage of the variable resistor 18 is A/D converted by the A/D conversion circuit 19. By inputting the temperature into the microcomputer 11 and comparing it with the set temperature corresponding to the operated menu, cooking is performed at the optimum temperature.
The characteristic change caused by the variable resistor 18 appears significantly in the low temperature range as shown in FIG. 4, and hardly appears in the high temperature range.
Substantially, fine adjustments can only be made when performing yeast fermentation cooking.

Note that the present invention is not limited to the above-mentioned embodiments, and a scale may be provided on or near the temperature fine adjustment screw 8u so that the user can finely adjust the set temperature corresponding to yeast fermentation cooking according to the cooking. It may be possible to do so. For example, when making croissant, the optimum fermentation temperature for the yeast is 37℃, and the user can adjust the temperature fine adjustment screw 8u to set the temperature to the optimum fermentation temperature for the yeast depending on the type of bread. I can do it. Also,
Various setting changes can be made without changing the gist of the invention.

<Effects of the Invention> As described above, the present invention has the unique effect of being able to accurately control the cooking temperature of yeast, which requires delicate temperature adjustment, and making it possible to perform yeast fermentation cooking well.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing one embodiment of the cooking device of the present invention, Fig. 2 is a flowchart explaining the operation when performing yeast fermentation cooking, and Fig. 3 shows another embodiment. FIG. 4 is a diagram showing the voltage-temperature characteristics between the terminals of the thermistor, FIG. 5 is a longitudinal cross-sectional view showing an embodiment of the cooking device of the present invention, and FIG. 6 is a cross-sectional view. 7 is a front view of the operation panel 8. FIG. 2...Cooking chamber, 8d...Temperature control knob, 8u...
...Temperature fine adjustment screw, 14...Fine adjustment variable resistance, 1
8...Variable resistance.

Claims (1)

[Claims] 1 Cooking temperature setting means for setting the internal temperature of the cooking chamber in which the food to be cooked is stored over a wide range from high-temperature cooking to yeast fermentation cooking, and a cooking temperature setting means for setting the cooking temperature slightly when the cooking temperature is set for yeast fermentation cooking. A cooking appliance characterized by comprising a set temperature fine adjustment means for adjusting.