JPH06129643A - Heating cooker - Google Patents

Abstract

PURPOSE:To prevent burning from being caused at the time of cooking moist food using a poor heat conduction vessel and further prevent cooking from being automatically interrupted in the course of cooking oily food. CONSTITUTION:A signal processing portion 6 sets heating interruption temperature to prevent burning taking as a reference temperature where an output of a temperature sensor 5 is substantially constant. When the output is not constant, the heating interruption temperature is set to predetermined temperature where oil is prevented from being fired. Burning is prevented even with a pan with bad heat conductivity where a boiling state is detected in ant oily food temperature region. Further, the signal processing portion 6 continuously judges whether or not the output from the temperature sensor 5 is substantially constant during the cooking, and alters the setting of the heating interruption temperature in response to a judgement result. Also in the case where oily food is processed in which there is existent a like temperature change as with a bad heat conductivity vessel, the heating interruption temperature is set to the predetermined temperature where oil is prevented from firing, whereby oily food cooking is prevented from being automatically extinguished in the course of the cooking.

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 determining whether to cook water or oil and automatically control heating.

[0002]

As a heating cooker such as a gas stove,
It is equipped with a temperature sensor that comes into contact with the bottom of a container such as a pan that is heated by putting food in it.By inferring the heating temperature of the food from the temperature detected by the temperature sensor, combustion control of a heating means such as a burner or automatic Some extinguish fires.

Further, in this type of heating cooker, as disclosed in Japanese Patent Laid-Open No. 3-236518, a boiling state is detected, and the temperature at which the boiling is detected is within a predetermined temperature range (for example, 97). If the temperature is within the above temperature range, it is determined that the food is cooked in water (collectively cooked foods that are cooked using water as media) are cooked in water. Distinguishes between cooking with water and cooking with oil automatically, by distinguishing from cooking with oil (collectively foods that are cooked through oil, such as fried food, is called cooking with oil). There is something. When it is determined that cooking is done with water, the fire is automatically extinguished when the temperature reaches a temperature that prevents burning, which is set by adding a predetermined temperature to the boiling detection temperature. In some cases, the fire is automatically extinguished when the oil temperature rises abnormally.

[0004]

By the way, JP-A-3-
In the heating cooker of Japanese Patent No. 236518, since the temperature detected by the temperature sensor is in a substantially constant state (boiling state) within a predetermined temperature range (97 ° C to 130 ° C), cooking with water and cooking with oil are performed. Making a distinction. However, in a container with poor heat conductivity (such as a clay pot), the temperature at which the temperature detected by the temperature sensor is almost constant even when cooking water is above the above-specified temperature range, which is determined to be cooking water. In some cases, it is judged that cooking is done with oil, even though cooking is done with water. Therefore, there is a problem in that the non-sticking function does not function properly and the cooked product is scorched.

Therefore, depending on the temperature at which the temperature detected by the temperature sensor becomes substantially constant, it is not possible to distinguish between the water cooking and the oil cooking, and the temperature detected by the temperature sensor becomes substantially constant ( Therefore, it is possible to distinguish between cooking with water and cooking with oil. However, in this way, if the heating state is weakened and kept at a constant temperature when the oil temperature reaches the predetermined temperature,
The temperature change is the same as in the case of a container with poor heat conduction, and in this case also, it is determined that the cooking is with water, and there is a problem that the fire is extinguished automatically during cooking.

The present invention has been made in view of the above points, and an object of the present invention is not to cause charring even when cooking water in a container having poor heat conduction and to cook oil. An object of the present invention is to provide a heating cooker that does not automatically extinguish when cooking.

[0007]

In the present invention, in order to achieve the above object, a heating means for heating a food product and a temperature for detecting the temperature by contacting the bottom of a container containing the food product and heated. Temperature detection means such as a sensor, determination means for determining whether the output of the temperature detection means is substantially constant, and when the output of the temperature detection means is substantially constant, this substantially constant temperature is used as a reference. As well as setting the heating stop temperature to prevent burning, if it is not constant, the temperature setting means to set the heating stop temperature to a predetermined temperature to prevent the ignition of oil, and the heating of the heating means according to the heating stop temperature. A heating control means for stopping the state is provided, and the determination of whether or not the output of the temperature detection means in the determination means is substantially constant is continued during the cooking period, and the temperature setting means determines the temperature according to the determination result of the determination means. And to change the setting of the heat stop temperature.

[0008]

According to the present invention, as described above, the determining means for determining whether or not the output of the temperature detecting means is substantially constant, and when the output of the temperature detecting means is substantially constant, this substantially constant temperature is obtained. The temperature of the output of the temperature detection means is set by setting a heating stop temperature for preventing burning and setting a heating stop temperature at a predetermined temperature for preventing oil ignition when the heating stop temperature is not constant. It is possible to set the heating stop temperature that prevents charring from the boiling detection temperature in a state where the temperature is almost constant, that is, in the boiling state, and even in the case of a pot with poor heat conduction where the boiling state is detected in the oil temperature range To prevent Also,
The determination whether the output of the temperature detecting means in the determining means is substantially constant is continued during the cooking period, and the temperature setting means changes the setting of the heating stop temperature according to the determination result of the determining means. When the oil temperature reaches the specified temperature, the heating state is weakened to maintain a constant temperature, and the temperature change also occurs when cooking oil such that the same temperature change as in the case of poor heat conduction is shown. In this case, when the output of the temperature detecting means of the temperature setting means is not constant, the function of setting the heating stop temperature to a predetermined temperature for preventing the ignition of oil prevents the problem of automatic fire extinguishing during cooking.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. In addition, in the present embodiment, the following description will be made on the case where the heating cooker is a gas stove. In this heating cooker, as shown in FIG. 1, gas is supplied to a burner 1 as a heating means through a main plug 3 and a gas supply control unit 4 as a heating control means, and the cooked food is burned by burning the burner 1. The container you put it in (the case of a pot is explained below)
Heat 2 to cook. Although not shown in FIG. 1, an ignition knob for performing ignition, fire extinguishing, and heat power adjustment is provided so that the heat power can be manually adjusted.

The combustion control of the burner 1 in this heating cooker is performed by a signal processing unit 6 composed of a microcomputer.
And a solenoid valve (or a proportional control valve or a gas shutoff valve)
And the gas supply control unit 4 configured by. In addition, the signal processing unit 6 determines the heating state of the cooked food suitable for the type of cooking according to the heating temperature of the cooked food. Here, since it is difficult to directly detect the temperature of the cooked food, a method of estimating the temperature of the cooked food is used by using a temperature sensor 5 such as a thermistor as a temperature detecting means that comes into contact with the bottom of the pan 2. There is. That is, in the signal processing unit 6, the output of the temperature sensor 5 is sampled to determine the type of cooking, the heating state of the cooking object that matches the type of cooking that is the determination result is determined, and the determination result is determined according to the determination result. The gas supply controller 4 is controlled to automatically adjust the combustion state of the burner 1 to a predetermined state or automatically extinguish the fire in a specific situation to control the heating of the cooked food.

A method of determining the type of cooking (discriminating between water cooking and oil cooking) in the heating cooker of this embodiment will be described below. In order to automatically discriminate between cooking with water and cooking with oil, first, as a first step, the temperature T _{0 at} which the food to be cooked (water to be added to the food to be cooked or water to be discharged from the food to be cooked) is detected is detected. In the following description, the temperature T ₀ at which boiling is detected will be referred to as a boiling detection temperature.

The boiling detection temperature T ₀ can be detected because the temperature detected by the temperature sensor 5 becomes substantially constant when water boils. The following method may be adopted as an example of the detection method. That is, as shown in FIG. 2, the time t (sec) required to rise from a predetermined temperature Ta (for example, 94.7 ° C.) to Tb (for example, 99.6 ° C.) in a temperature range before boiling is measured. Then, the time tx required to rise from the temperature Tb to the constant temperature Tc (for example, 1 ° C.) is measured. The time when the temperature rises from the temperature Tb to the constant temperature Tc is shown by a cross mark in FIG. Then, when the required time tx becomes longer than a value (At) obtained by multiplying the required time t by a predetermined coefficient A (At <tx), the boiling detection temperature T ₀ is set.

On the basis of the boiling detection result, discrimination between cooking with water and cooking with oil is performed. For example, boiling is detected when cooking water, so when boiling is detected, it is determined to be cooking water. However, if the temperature range is not limited, cooking with oil may show the same situation as boiling. For example, when frying tempura,
The same situation as in the case of boiling is shown when the heating power is set to low heat so that the oil temperature is kept constant. Therefore, as shown in FIG. 3, an upper limit temperature Td (for example, 160 ° C.) which is a criterion for judging boiling is provided, and when boiling is detected below this temperature Td, it is judged to be cooking with water. I am doing it. Therefore, if boiling is not detected and the temperature exceeds Td, it is determined that cooking is done with oil.

Conventionally, an automatic fire extinguishing temperature for preventing burning and an automatic fire extinguishing temperature for preventing oil ignition have been set based on the boiling detection result. However, as described above, in the pot 2 having poor heat conduction such as a clay pot, as shown in FIG. 3B, boiling may be detected in a temperature range determined to be cooking with oil. In order to improve this point, in the heating cooker of the present embodiment, the boiling detection is continuously performed even in the temperature range of oil cooking which exceeds the temperature range in which water cooking is determined.

In addition, in the pot 2 having poor heat conduction such as a clay pot,
Even if boiling is detected within the temperature range where it is determined to be cooking with water, the temperature detected by the temperature sensor 5 rises steadily thereafter, and if the automatic fire extinguishing temperature is set only from the boiling detection temperature T ₀ , the cooked food will be cooked. It happens that the fire is extinguished without being boiled enough. Therefore, in order to improve this point, the heating cooker according to the present embodiment is configured to detect that the temperature detected by the temperature sensor 5 becomes constant after the boiling is detected.

To determine that the temperature detected by the temperature sensor 5 is constant, for example, as shown in FIG. 4, a predetermined number of times N (several times) is set once every constant time t ₁ (several tens of seconds). The process of checking the temperature detected by the temperature sensor 5 is repeated. Here, when the temperature detected by the temperature sensor 5 in one set is set as the reference value Tr, the temperature sensor 5 detects the temperature within a predetermined upper and lower temperature ± ΔT (for example, several degrees Celsius) with respect to the reference value Tr. Determine how many times the temperature is included. Then, as a result, if the temperature detected by the temperature sensor 5 is included in the constant temperature above and below the reference value Tr (Tr ± ΔT), for example, N−1 times or more, then 1
Judge that the set is in a constant state. Then, if it is determined that the temperature is constant in a plurality of consecutive sets n (several sets), it is determined that the temperature of the pan 2 is in the constant state.

When it is determined that the temperature is constant in this way, the constant temperature Te is set to the reference value Tr of the final set determined to be constant.
The temperature (Tr + Te) to which (for example, several tens of degrees Celsius) is added is taken as the automatic fire extinguishing temperature. However, at this time, the temperature is equal to or higher than the discrimination temperature Td for discriminating between cooking with water and cooking with oil, and is equal to or lower than the upper limit temperature Tf at which the temperature detected by the temperature sensor 5 cannot be constant in the case of the pot 2 having poor heat conduction. If so, the automatic fire extinguishing temperature is set by the method described above. Before the boiling is detected, the automatic extinguishing temperature Ts is set to prevent the oil from being ignited. In addition, Te, which is the automatic extinguishing temperature for preventing burning, may be changed depending on the temperature range of the temperature at the time of boiling detection.

However, in this case, as described above, the heating state is weakened when the temperature of the oil reaches a temperature near the boiling detection temperature T ₀ of the pot 2 having poor heat conduction such as a clay pot. Then, if the oil temperature is kept constant, as shown in FIG. 3 (a), the same temperature change as that of the pot 2 with poor heat conduction is shown. In that case, the automatic fire extinguishing temperature for the pot 2 with poor heat conduction is shown. Is set. In this case, there is a risk that the fire may be extinguished automatically during cooking.

Therefore, in this embodiment, even if the automatic fire extinguishing temperature is once set as described above, when the temperature change exceeds a predetermined temperature, the automatic fire extinguishing temperature Ts for cooking oil is set. The setting is changed. For example, even if the heating state is weakened and kept at a constant temperature when the temperature of the oil reaches a predetermined temperature, cooking of the oil is then performed (for example, frying the tempura), and FIG.
As shown in, the oil temperature drops when the ingredients are added. Therefore, this state is detected and the automatic fire extinguishing temperature is returned to the temperature Ts in the case of cooking with oil. Since it is conceivable to raise the heating temperature of the oil during cooking, the automatic fire extinguishing temperature is returned to the temperature Ts in the case of cooking with oil.

That is, in the case of the present embodiment, the determining means for determining whether or not the output of the temperature sensor 5 is substantially constant, and when the output of the temperature sensor 5 is substantially constant, this substantially constant. The signal processing unit 6 is provided with a function as a temperature setting means for setting an automatic fire extinguishing temperature for preventing burning on the basis of the temperature to be set and for setting the automatic fire extinguishing temperature to a predetermined temperature for preventing oil ignition when it is not constant. I have it.

In this way, there is no problem even if the temperature range for determining that the output of the temperature sensor 5 becomes substantially constant is extended to the temperature range for cooking oil. By the way, in the above-mentioned case, the automatic fire extinguishing temperature is simply returned to the temperature in the case of oil cooking by detecting the temperature change, but the time for judging the temperature change is limited, and the temperature exceeding the time is exceeded. In the change, the automatic fire extinguishing temperature may not be returned to the temperature for cooking oil. Further, the automatic fire extinguishing temperature may be returned to the temperature in the case of cooking with oil, based on the temperature change per unit time.

However, if water is dipped while cooking in a clay pot or the like, the temperature detected by the temperature sensor 5 is once lowered as shown in FIG. The temperature is returned to Ts. However, in this case, the output of the temperature sensor 5 thereafter returns to a substantially constant state, so if the operation of detecting that the temperature detected by the temperature sensor 5 becomes constant is continued, the detected temperature becomes constant. When it is determined that it has been done, the automatic fire extinguishing temperature can be returned to the temperature (Tr '+ Te (where Tr' is the reference value when it is determined that the temperature is constant again)) for preventing sticking. A flow chart summarizing the signal processing according to the present invention in the above signal processing unit 6 is shown in FIG.

By the way, although the above description is for the case of the gas stove, it goes without saying that the present invention can be applied to the case of an electric stove. Further, if there is a temperature change using the function of detecting the temperature change, the heat power may be automatically adjusted according to the temperature change to keep the temperature of the cooked food constant.

[0024]

As described above, according to the present invention, the determination means for determining whether or not the output of the temperature detecting means is substantially constant, and when the output of the temperature detecting means is substantially constant, the substantially constant output is obtained. The temperature detection means has a temperature setting means for setting a heating stop temperature for preventing charring based on the temperature to be set and for setting the heating stop temperature to a predetermined temperature for preventing oil ignition when the temperature is not constant. When the output of the means is almost constant, that is, the heating stop temperature that prevents burning from the boiling detection temperature in the boiling state can be set, and the boiling state is detected in the oil temperature range Also, it can prevent burning. Further, the determination as to whether the output of the temperature detection means in the determination means is substantially constant is continued during the cooking period, and the temperature setting means changes the setting of the heating stop temperature according to the determination result of the determination means. Therefore, when the temperature of the oil reaches the specified temperature, the heating state is weakened and kept at a constant temperature, and even when cooking oil such that the temperature change is similar to the case of a container with poor heat conduction, the temperature change In this case, when the output of the temperature detection means of the temperature setting means is not constant, the function of setting the heating stop temperature to a predetermined temperature that prevents the ignition of oil prevents the problem of automatic extinguishing during cooking. You can

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of the boiling detection method of the above.

3 (a) and 3 (b) are explanatory views of a method of setting an automatic fire extinguishing temperature in cooking oil, and a method of setting an automatic fire extinguishing temperature in water cooking using a container having poor heat conduction.

FIG. 4 is an explanatory diagram of a method for detecting a state where the output of the temperature sensor is constant after the boiling is detected.

FIG. 5 is a flowchart summarizing the operation of the signal processing unit.

[Explanation of symbols]

 1 burner 2 pan 4 gas supply controller 5 temperature sensor 6 signal processor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukiko Tani 1-152 Oka, Minami-shi, Minato-ku, Osaka City Harman Co., Ltd.

Claims (1)

[Claims] 1. A heating means for heating a cooked food, a temperature detecting means such as a temperature sensor for detecting the temperature by contacting the bottom of a container in which the cooked food is heated, and the output of the temperature detecting means is almost the same. When the output of the determination means for determining whether or not it is constant and the temperature detection means is substantially constant, the heating stop temperature for preventing burning is set on the basis of this substantially constant temperature, and when it is not constant Includes a temperature setting means for setting the heating stop temperature to a predetermined temperature for preventing oil ignition, and a heating control means for stopping the heating state of the heating means in accordance with the heating stop temperature. It is characterized in that the determination as to whether or not the output of the detection means is substantially constant is continued during the cooking period, and the temperature setting means changes the setting of the heating stop temperature according to the determination result of the determination means. Heat cooker.