JP2669739B2 - Cooker - 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 cooker having a function of automatically controlling a heating state.

[0002]

2. Description of the Related Art As a cooking device such as a gas stove, depending on a cooking method such as boiling, frying (including frying with oil) or baking, for example, combustion control of a heating means such as a burner (a small fire, There is a type in which the heating temperature of the cooked food can be automatically adjusted by performing a large fire switch. Further, a method of estimating the heating temperature of the food from the output of a temperature sensor that detects the temperature by contacting the bottom of a container such as a pot that is heated with the food is generally adopted.

[0003] In this type of heating cooker, for example, a mode for boiling food (hereinafter, this mode is referred to as a boiling mode).
When the temperature detected by the temperature sensor reaches the temperature determined to be burnt, the burner is automatically extinguished to prevent burning of the food. Also, if you set the mode to fry or fry the food (hereinafter, this mode is called oil mode), keep the oil temperature constant or when the oil temperature becomes abnormally high The fire can be extinguished automatically.

Further, if a cooking mode is set for baking, automatic extinguishing can be performed when the heating temperature rises abnormally.

[0005]

In the cooking mode of the cooking device described above, the heating stop temperature is set to prevent burning.
Use a fixed set temperature or adjust
The temperature obtained by adding a predetermined temperature to the boiling detection temperature, which is the temperature at the time when the boiling state of the physical material is detected , is employed . However, when using a container such as an earthen pot with poor heat conduction or a super heat-resistant glass container, and using a container such as an aluminum pan with good heat conduction, even if the food is at the same temperature, The temperature detected by the sensor varies. Therefore, in order to prevent burning, it is necessary to activate the control of the heating means on the safe side so that the heating state is stopped early. Therefore, when the heating stop temperature is set fixedly, in the case of poor vessel thermal conductivity, water is (not cause scorching) abound in the container even though the pressurized heat is stopped cause problems that put away.

Further, a predetermined temperature is added to the detected boiling temperature.
Even when the heating stop temperature is set, the same problem as in the case where the heating stop temperature is fixed occurs because the boiling detection temperature itself varies depending on the type of the container. The present invention has been made in view of the above points, and an object of the present invention is to provide a heating cooker capable of appropriately setting the heating stop temperature even when the types of containers are different.

[0007]

According to the present invention, in order to achieve the above object, the determining means detects the temperature by the temperature detecting means.
The rate of temperature rise is based on the rate of temperature rise before boiling detection.
Boiling the temperature when the speed falls below the reference speed set by
As the detection point, the boiling detection point is lower than the preset identification temperature.
If there is no tendency for the temperature to rise after the rise detection point is detected, it will be fixed.
The heating detection temperature is used, and the boiling detection point is lower than the discrimination temperature.
Is there a tendency for the temperature to rise after the boiling point is detected?
If the knowledge point is higher than the identification temperature, after the boiling detection point is detected
The temperature detected by the temperature detector has become constant
That is, the heating stop temperature is determined according to the temperature range to which the reference value, which is the temperature at which it is determined, belongs .

Further, according to the temperature range to which the reference value belongs,
The determined heating stop temperature can be selected from several fixed temperatures.
Re to a particular temperature to be, alternatively, the reference
The heating stop temperature determined according to the temperature range to which the value belongs is
It may be the temperature obtained by adding a predetermined temperature to the reference value.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The present invention, by the quality of the thermal conductivity of the container, paying attention to the temperature showing a boiling state, further the boiling detecting temperature region is different from the temperature becomes constant after, detection by the temperature detecting means
The rising rate of the output temperature is the same as the temperature rising rate before boiling detection.
The temperature when the speed falls below the reference speed set based on the
The boiling detection point is lower than the preset identification temperature.
If there is no tendency for the temperature to rise after the detection of the boiling point,
The boiling point is lower than the discrimination temperature
Boiling is low Is there a tendency for the temperature to rise after detection of the boiling point? Boiling
After the boiling detection point is detected, if the detection point is higher than the identification temperature
The temperature detected by the temperature detection means
By determining the heating stop temperature according to the temperature range belongs reference value is a temperature at which it is determined that, as can be determined heating stop temperature according to the type of container, when the type of container is different However, an appropriate heating stop temperature can be set.

[0010]

1 to 4 show an embodiment of the present invention. In the present embodiment, the following description will be given of a case where the heating cooker is a gas table stove. In this heating cooker, as shown in FIG. 1, gas is supplied to a burner 1 as a heating means via a main plug 3 and a gas supply control unit 4 as a heating control means, and the cooked food is burned by the burner 1. The cooked container 2 (hereinafter, a case of a pot) is heated and cooked. Although not shown in FIG. 1, an ignition knob for performing ignition, fire extinguishing and thermal power adjustment is provided so that the thermal power adjustment can be performed manually.

In the case of this heating cooker, the degree of heating can be automatically adjusted according to cooking such as boiling, frying (including frying with oil) or baking, and various cooking modes such as the cooking mode, oil mode and baking mode can be used. The setting of the cooking mode is performed by the mode setting unit 8. The mode setting section 8 includes a mode changeover switch for switching a cooking mode, a setting section for setting a temperature setting, a heating time, and the like, and a setting value or a current value of which setting mode or which cooking mode is being operated. A display unit for displaying information is integrally provided.

The combustion control of the burner 1 according to the cooking mode set by the mode setting unit 8 may be performed by a signal processing unit 6 composed of a microcomputer as a judging means and a solenoid valve (or a proportional control valve or the like). ) Is performed with the gas supply control unit 4 configured as described above. In addition, the signal processing unit 6 determines the heating state of the food that matches the cooking mode set by the mode setting unit 8 according to the heating temperature of the food.
Here, since it is difficult to directly detect the temperature of the food, a method of estimating the temperature of the food by using a temperature sensor 5 such as a thermistor as a temperature detecting means that contacts the bottom of the pot 2 is adopted. I have. That is, the signal processing unit 6 samples the output of the temperature sensor 5 to determine the heating state of the food that matches the cooking mode set by the mode setting unit 8, and according to the determination result, the gas supply control unit By controlling the burner 4, the combustion state of the burner 1 is automatically adjusted to a predetermined state, or the fire is automatically extinguished in a specific situation to control the heating of the food.

The cooking mode of the heating cooker according to the present invention will be described below. First, in the boiled food mode, when the temperature detected by the temperature sensor 5 becomes a temperature determined to be scorched, the gas supply control unit 4 stops gas supply and automatically extinguishes the burner 1. Prevent scorching. At this time, the user is simultaneously notified of the burning by a notification means such as a buzzer. In the case of the boiled food mode, the user can set the time to boil. When the time is set in this manner, the fire is automatically extinguished after the set time elapses. However, even before the elapse of the set time, if the burning is detected, the fire is automatically extinguished.

Next, in the oil mode, the amount of combustion (thermal power) of the burner 1 is automatically adjusted to the upper limit temperature when frying or frying below the temperature at which the oil ignites. Note that the upper limit temperature can be set to a desired temperature according to cooking by the user. Also, when the temperature rises to a temperature determined to be abnormal for some reason, automatic fire extinguishing is performed. In the baking mode, the combustion amount (thermal power) of the burner 1 is automatically adjusted to the upper limit temperature. However, the upper limit temperature in the baking mode is adjusted to be higher than that in the oil mode. In this case, if the temperature abnormally rises above the upper limit temperature, automatic fire extinguishing is performed.

Further, this heating cooker is equipped with a boiling water mode which is convenient for boiling the hot water, detects the boiling state of the hot water from the output of the temperature sensor 5, and notifies it by a buzzer or the like to automatically extinguish the fire. It has a function to perform. The boiling state of the hot water can be detected because the temperature of the water becomes substantially constant when the water boils, and the output of the temperature sensor 5 also becomes substantially constant.

Further, as a function commonly provided in all the above-described cooking modes, a function is provided for automatically turning off the fire when the timer for preventing extinguishing is operated at the same time as the ignition and when the time set in the timer has elapsed. ing. Less than,
A method for setting the burning extinguishing temperature when the type of the pan 2 is different in the boiling mode, which is a feature of this embodiment, will be described. First, as a first step, the temperature T at which the food (water added to or output from the food) boils.
₀ is detected. In the following description, the temperature T _{0 at} which the boiling is detected is referred to as a boiling detection point.

Here, the reason for detecting the boiling detection point T ₀ is that a container having poor heat conduction has a higher boiling detection point T ₀ than a container having good heat conduction, and if the boiling detection point T ₀ is detected, the pot 2 is detected.
This is because it is possible to discriminate whether the heat conduction is good or bad (for example, whether it is a clay pot or an aluminum pot). The boiling point T ₀ is
When the water boils, it can be detected from the fact that the temperature detected by the temperature sensor 5 becomes substantially constant. The following method may be adopted as an example of the detection method. That is, as shown in FIG. 3, the time required t when rising from a predetermined temperature T ₃ at the previous temperature range boils up T ₄ were measured, the temperature T ₄ or later to increase for every predetermined temperature Tc ₃ The time tx required for is measured. In addition, the time when the temperature rises from the temperature T ₄ to the constant temperature Tc ₃ is shown by a cross mark in FIG. Then , the time tx is a value obtained by multiplying the required time t by a predetermined coefficient A (A
When the time becomes longer than (t <tx), the boiling detection point T
_Set to ₀ .

In other words, in this method, the temperature is determined to be boiling when the temperature rise rate falls below the rise rate determined based on the reference rate in the temperature range before boiling. is there. If the boiling detection point T ₀ is detected as described above, whether the pot 2 has good heat conduction depends on whether the boiling detection point T ₀ is higher than a predetermined identification temperature Tx. Identify. That is, when the boiling detection point T ₀ is higher than the discrimination temperature Tx, the pot has poor heat conduction (for example, an earthen pot). When the boiling detection point T ₀ is lower than the discrimination temperature Tx, the pot has good heat conduction. For example, an aluminum pot). If the pot has good heat conduction , set the fire extinguishing temperature, which is the heating stop temperature, in advance.
T ₁ is set steadily, and in the case of a pot having poor heat conduction, the fire extinguishing temperature is determined by a method described later. Here,
The term heat extinguishing temperature is used to mean extinguishing temperature.
In the state, the heating means is the burner 1 and the heating stop is the burner 1.
Because it corresponds to extinguishing fire.

By the way, even if the boiling detection point T ₀ is lower than the identification temperature Tx as described above, it is not always a pot with good heat conduction. That is, even if the pot 2 is a pot with poor heat conduction such as a clay pot, the boiling detection point T ₀ may be equal to or lower than the identification temperature Tx due to the fluctuation of the flame due to wind or the like. Therefore, the boiling point T ₀ is the identification temperature Tx.
If it is lower than that, double check to make sure that the pot has good thermal conductivity. Here, when the boiling detection point T ₀ becomes equal to or lower than the identification temperature Tx due to the fluctuation of the flame due to wind or the like in the pot with poor heat conduction, the temperature rises even after the boiling detection,
Check again to see if this is the case.

As the reconfirmation method, the boiling point T _{0 is} detected.
The required time (indicated by t ₁ to t ₃ in FIG. 4) is measured each time the constant temperature Tc ₁ rises, and the required time for each rise of the constant time Tc ₁ is within the constant time tc a plurality of times. Judge whether to continue. Here, a constant temperature Tc ₁ is greater than a predetermined temperature Tc ₃ during boiling prefecture value, and the predetermined time tc set longer than the boiling detection time At, to be able to reliably detect the temperature rise state Is preferred.

Then, by this reconfirmation, the constant temperature Tc
_{1 When} it is confirmed that the time required for each rise does not continue for a predetermined time tc a plurality of times (that is, the temperature
If there is no rising tendency) , it is sure that the pot with good heat conduction 2
As it is, to determine the fire extinguishing temperature T ₁ of the above. On the contrary, the time required for each rise of the constant temperature Tc ₁ is the constant time t
When the state shorter than c continues for a plurality of times, it is determined that the pot 2 with good heat conduction is not present, and the boiling detection point T described below is reached.
The processing when ₀ is higher than the discrimination temperature Tx is performed.

Hereinafter, the processing when the boiling detection point T ₀ is higher than the discrimination temperature Tx will be described. Above boiling detection point T
_{If 0} is higher than the discrimination temperature Tx, it is detected that the temperature detected by the temperature sensor 5 becomes constant. Here, the temperature detected by the temperature sensor 5 is detected to be constant because the temperature detected by the temperature sensor 5 rises sloppyly even after the boiling is detected in the pot 2 having poor heat conduction such as a clay pot. This is because, if the extinguishing temperature is set only from the boiling detection point T ₀ , the food may be extinguished without being boiled sufficiently.

The determination of the temperature detected by the temperature sensor 5 becomes constant, for example, as shown in FIG. 5, detected by the temperature sensor 5 a predetermined number of times (N times) as one set for each predetermined time t ₁ The process of checking the temperature is repeated.
Here, assuming that the temperature detected by the temperature sensor 5 first in one set is the reference value Tr, the temperature detected by the temperature sensor 5 within a constant upper and lower temperature (± Td) with respect to this reference value Tr. Determine how many times it is included. As a result, if the temperature detected by the temperature sensor 5 is included, for example, (N-1) times within the upper and lower constant temperature (Tr ± Td) with respect to the reference value, one set at that time is in a constant state. It is determined that there is. Then, when it is determined that the plurality of sets of the predetermined number are in a constant state, the temperature of the pan 2 is determined to be in a constant state.

When it is determined that the temperature is constant, the reference temperature Tr of the final set determined to be constant is changed to the constant temperature Tc _2.
The temperature (Tr + Tc ₂ ) to which is added is the extinguishing temperature. The maximum temperature of the fire extinguishing temperature (Tr + Tc ₂ ) determined here is such that the fire extinguishing temperature T _{2 of the} earthen pot is maximized to prevent the fire extinguishing temperature from becoming abnormally high. That is, the fire extinguishing temperature (Tr + Tc ₂ ) is a fire extinguishing temperature applied to a heat-resistant glass container or the like. Extinguishing temperatures T ₁ and T ₂ are Tx <T
The relationship is ₁ <T ₂ .

When the temperature detected by the temperature sensor 5 becomes constant as described above, it is also determined whether or not the temperature range is higher than the discrimination temperature Ty. Here, the discrimination temperature Ty> the discrimination temperature Tx. That is, the temperature range in which the temperature detected by the temperature sensor 5 is constant is the identification temperature Ty.
This is because if the temperature is lower than the above, the pot 2 may be handled in the same manner as the case where the pot 2 has good heat conduction, without performing the above-described treatment of setting Tr + Tc ₂ to the extinguishing temperature. In this case, the extinguishing temperature is T ₁ . However, T ₁ > Ty.

The above process is continuously performed even after the extinguishing temperature is determined. For example, when stir-frying (cooking in which the cooked food 2 is cooked after frying) is performed, the temperature detected by the temperature sensor 5 is high during the frying, but after that, This is because if the food is stewed by adding water or the like, the certain temperature range becomes low, and if the food is cooked at the fire extinguishing temperature determined when the food is being fried, the food may be scorched.

[0027]

As described above, according to the present invention, the judging means detects that the temperature rise rate detected by the temperature detecting means is a boiling rate.
The speed does not fall below the reference speed set based on the previous temperature rise speed.
The temperature at the time of boiling is set as the boiling detection point, and the boiling detection point is the default.
Below the discrimination temperature, the temperature rises after the boiling point is detected.
If there is no direction, use a fixed heating stop temperature to detect boiling
The point is lower than the identification temperature
If there is a rising tendency or the boiling detection point is higher than the discrimination temperature,
The temperature detected by the temperature detecting means after the detection of the boiling detection point
Temperature is the temperature at which the temperature is determined to be constant
Also determines the heating stop temperature according to the temperature range belongs reference value
Based on the magnitude relationship between the boiling detection point and the identification temperature.
The thermal conductivity of the container is tentatively determined, and the boiling detection point and the identification temperature are
Of temperature and tendency of temperature rise after detection of boiling point
Since determining the heating stop temperature based on the presence or absence of, it is possible to determine the heating stop temperature according to the type of container, there is an effect that the type of container may be set an appropriate heating stop temperature even if different. Especially, based on the boiling detection point,
After tentatively determining the type of container, add another determination condition
The type of the container, there is a possibility of misidentifying the type of container.
It is possible to set the heating stop temperature appropriately.
You.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing a main operation of the embodiment.

FIG. 3 is an explanatory diagram of a method for detecting a boiling state.

FIG. 4 is an explanatory diagram of a confirmation process when it is determined that the pot has good heat conduction.

FIG. 5 is an explanatory diagram of a method of detecting that the temperature is constant when it is determined that the pot has poor heat conduction.

[Description of Signs] 1 burner 2 pan 4 gas supply control unit 5 temperature sensor 6 signal processing unit

 ───────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makiko Nagano 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (72) Inventor Yutaka Yoshida 1-1-52, Oka, Minami-shi, Minato-ku, Osaka-shi Inside the company Harman (72) Inventor Tomoko Tanaka 1-15-1 Oka, Minami-shi, Minato-ku, Osaka-shi Inside the company Herman (72) Inventor Yukiko Tani 1-1-52, Minami-shioka, Minato-ku, Osaka-shi Within the company Herman (72) Inventor Eriko Aoki 1-152 Minami-shi Minato-shi, Minato-ku, Osaka, Harman Co., Ltd. (56) Reference JP-A-58-160738 (JP, A)

Claims (3)

(57) [Claims] 1. A heating means for heating a food, a temperature detecting means such as a temperature sensor for detecting a temperature by contacting a bottom of a container into which the food is put and heated, and according to an output of the temperature detecting means. the heating stop temperature for stopping the heating state of the food Te
A heating cooker comprising a determination means for determining and a heating control means for stopping the heating state of the heating means according to the determination result of the determination means , wherein the determination means includes the temperature detection means.
The temperature rise rate detected by
When the speed falls below the reference speed set based on the ascent speed
The temperature is used as the boiling detection point, and the boiling detection point is the default identification temperature.
The temperature must not rise after the boiling point is detected.
For example, using a fixed heating stop temperature, the boiling detection point is the identification temperature.
The temperature tends to rise after the boiling point is detected.
If the boiling detection point is higher than the identification temperature, the boiling detection point
The temperature detected by the temperature detection means after the detection of
A heating cooker, characterized in that a heating stop temperature is determined according to a temperature range to which a reference value, which is a temperature when it is determined that the state has come to a state, is determined . 2. The method according to claim 1, wherein the reference value is determined according to a temperature range to which the reference value belongs.
Heating stop temperature is being cooking device according to claim 1, characterized in that the <br/> particular temperature selected from several fixed temperature. 3. The method according to claim 1, wherein the reference value is determined according to a temperature range to which the reference value belongs.
Heating stop temperature is being cooking device according to claim 1, wherein the reference value is a temperature obtained by adding a predetermined temperature.