JP2703464B2 - 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 cooking device having a function of automatically determining cooking of water and cooking of oil and automatically controlling heating.

[0002]

2. Description of the Related Art As a cooking device 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, which is heated by putting food in it, and estimates the heating temperature of the food based on the temperature detected by the temperature sensor. Some extinguish fires.

Further, in this type of heating cooker, as disclosed in Japanese Patent Application Laid-Open No. 3-236518, a boiling state is detected, and the temperature at which the boiling is detected is set in a predetermined temperature range (for example, 97 ° C.). If the temperature is within the above-mentioned temperature range, it is determined that water cooking is performed (water-based cooking such as boiled food is collectively referred to as water cooking). Automatically distinguishes between water-based cooking and oil-based cooking by discriminating oil-based cooking (things that are cooked using oil as a medium, such as fried foods, are collectively referred to as oil-based cooking). There is something. Then, when it is determined that water cooking is to be performed, the fire is automatically extinguished when the temperature for preventing scorching is set by adding a predetermined temperature to the boiling detection temperature, and it is determined that oil cooking is to be performed. In such a case, the fire is automatically extinguished when the oil temperature becomes abnormally high.

[0004]

SUMMARY OF THE INVENTION Incidentally, Japanese Patent Application Laid-Open No.
In the heating cooker disclosed in JP-A-236518, since the temperature detected by the temperature sensor becomes substantially constant (boiling state) within a predetermined temperature range (97 ° C. to 130 ° C.), the cooking of water and the cooking of oil are performed. Judgment is being performed. However, in a container having poor heat conduction (for example, an earthen pot), the temperature at which the temperature detected by the temperature sensor becomes substantially constant even when cooking water is above the predetermined temperature range in which it is determined that water is cooked. In this case, it is determined that the cooking is oil-based even though the cooking is water-based. Therefore, there is a problem that the non-sticking function does not function properly and the food is scorched.

Therefore, depending on the temperature at which the temperature detected by the temperature sensor becomes substantially constant, the above-mentioned cooking with water and cooking with oil are not distinguished, and the temperature detected by the temperature sensor becomes substantially constant ( Based on the fact that the boiling state is detected, it is conceivable to distinguish between cooking with water and cooking with oil. However, in this case, when the temperature of the oil reaches a predetermined temperature, the heating state is weakened and maintained at a constant temperature.
The same temperature change as in the case of a container having poor heat conduction is exhibited, and in this case, too, it is determined that water is being cooked, and there is a problem that the fire is automatically extinguished during cooking.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to prevent oil from being scorched even when cooking water in a container having poor heat conductivity. An object of the present invention is to provide a heating cooker that does not automatically extinguish a fire during cooking.

[0007]

According to the present invention, in order to achieve the above object, a heating means for heating a food and a temperature for detecting a temperature by contacting the bottom of a container to be heated with the food contained therein. A temperature detecting means such as a sensor, a 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, a reference is made to this substantially constant temperature. If the heating stop temperature is set to prevent burning, and if not constant, the heating stop temperature is set to a predetermined temperature to prevent ignition of oil, and the heating means is heated according to the heating stop temperature. Heating control means for stopping the state, 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 is used in accordance with 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 discriminating means for discriminating 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 temperature is obtained. And a temperature setting means for setting the heating stop temperature to a predetermined temperature for preventing the ignition of the oil when the heating stop temperature is not constant, based on the output of the temperature detecting means. Can be set from the boiling detection temperature in the state where the temperature is almost constant, that is, from the boiling detection temperature 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 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 setting of the heating stop temperature is changed by the temperature setting means according to the determination result of the determination means. When the temperature of the oil reaches a predetermined temperature, the heating state is weakened and maintained at a constant temperature, and even in the case of cooking oil, which shows the same temperature change as that of a container having poor heat conduction, the temperature change also occurs. 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 for preventing the ignition of oil prevents the problem of automatic fire extinguishing during cooking.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the following description will be given of a case where the cooking device is a gas 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. A container (in the following, the case of a pot is described)
2 is cooked by heating. 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.

[0010] 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 valve)
And the gas supply control unit 4 configured as described above. In addition, the signal processing unit 6 determines a heating state of the food that matches the type of cooking 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. In other words, the signal processing unit 6 samples the output of the temperature sensor 5 to determine the type of cooking, determines the heating state of the food that matches the type of cooking that is the determination result, and responds to the determination result. By controlling the gas supply control unit 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.

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

The boiling detection temperature T ₀ can be detected from the fact that when the water boils, 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. 2, a time t (sec) required to increase 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, a time tx required to increase from the temperature Tb to a certain temperature Tc (for example, 1 ° C.) is measured. Note that the time point at which the temperature rises from the temperature Tb to the constant temperature Tc is indicated by a mark x in FIG. The required time tx is to the required time is longer than the over value (At) by a predetermined coefficient A to t (At <tx) Boiling detecting the time temperature T _0.

Based on the result of the boiling detection, a determination is made between cooking water and cooking oil. For example, since boiling is detected when cooking water, when boiling is detected, it is determined that water is being cooked. However, when the temperature range is not limited, the same situation as in the case of boiling may be exhibited in cooking oil. For example, when frying tempura,
This indicates the same situation as in the case of boiling when the heating power is set to low heat so as to keep the oil temperature constant. Therefore, as shown in FIG. 3, an upper limit temperature Td (for example, 160 ° C.) of a criterion for judging that boiling is present is provided, and when boiling is detected below this temperature Td, cooking with water is determined. It is. Therefore, if the temperature exceeds the temperature Td without detecting the boiling, it is determined that the cooking is oily.

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

In a pot 2 having poor heat conduction, such as an earthen pot,
Even if boiling is detected within the temperature range that is determined to be water cooking, the temperature detected by the temperature sensor 5 rises slowly thereafter, and if the automatic fire extinguishing temperature is set only from the boiling detection temperature T ₀ , the food is cooked. It happens that the fire is extinguished without being boiled enough. Therefore, in order to improve this point, the heating cooker of the present embodiment detects that the temperature detected by the temperature sensor 5 becomes constant after the above-mentioned boiling detection.

The determination that the temperature detected by the temperature sensor 5 is constant is performed, for example, as shown in FIG. 4, by setting a predetermined number of times N (several times) for each set 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 first detected by the temperature sensor 5 in one set is set as the reference value Tr, the temperature is detected by the temperature sensor 5 within a constant upper and lower temperature ± ΔT (for example, several degrees Celsius) with respect to this 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, for example, N-1 times or more within the constant upper and lower temperature (Tr ± ΔT) with respect to the reference value Tr, 1 at that time is obtained.
The set is determined to be in a constant state. When it is determined that the temperature is constant in a predetermined number of consecutive sets n (several sets), it is determined that the temperature of the pan 2 is constant.

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 Te.
The temperature (Tr + Te) to which (for example, several tens of degrees Celsius) is added is defined 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, the automatic extinguishing temperature is set by the method described above. Prior to the detection of boiling, the temperature is set to an automatic fire extinguishing temperature Ts for preventing ignition of oil. Further, the automatic fire extinguishing temperature Te for preventing burning may be varied according to the temperature range of the temperature at the time of the above-mentioned boiling detection.

However, in such a case, as described above, the heating state is reduced 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 an earthen pot. When the temperature of the oil is kept constant, as shown in FIG. 3 (a), a temperature change similar to that of the pot 2 with poor heat conduction is exhibited. Is set. In this case, there is a risk that the fire will be automatically extinguished during cooking.

Therefore, in this embodiment, even if the automatic fire extinguishing temperature is once set as described above, when the temperature changes by a predetermined temperature or more thereafter, the automatic fire extinguishing temperature Ts in the case of cooking oil is set. The settings are 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, if cooking of the oil is subsequently performed (for example, fried tempura), FIG.
As shown in the figure, the temperature of the oil drops when the ingredients are put. Therefore, this state is detected, and the automatic fire extinguishing temperature is returned to the temperature Ts in the case of cooking 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 oil.

That is, in the case of the present embodiment, a determination means for determining whether or not the output of the temperature sensor 5 is substantially constant, and if the output of the temperature sensor 5 is substantially constant, A function of temperature setting means for setting an automatic fire extinguishing temperature for preventing burning based on the temperature to be applied and for setting the automatic extinguishing temperature to a predetermined temperature for preventing the ignition of oil when the temperature is not constant, to the signal processing unit 6. I have it.

In this way, there is no problem even if the temperature range for judging 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 change of the fire extinguishing temperature is returned to the temperature in the case of cooking oil, by simply detecting the temperature change, but the time for judging the temperature change is limited, and the temperature exceeding the time is limited. In a change, the automatic fire extinguishing temperature may not be returned to the temperature in the case of cooking oil. Further, the automatic fire extinguishing temperature may be returned to the temperature in the case of cooking oil based on a temperature change per fixed time.

However, if a water difference is caused during cooking in an earthen pot or the like, the temperature detected by the temperature sensor 5 temporarily drops as shown in FIG. The temperature is returned to the temperature Ts. However, in this case, since the output of the temperature sensor 5 returns to a state where the temperature becomes substantially constant thereafter, 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 the temperature has been reset, the automatic fire extinguishing temperature can be returned to the temperature (Tr ′ + Te (Tr ′ is a reference value when it is determined that the temperature is again determined to be constant)) to prevent the burning. FIG. 5 is a flowchart summarizing the signal processing according to the present invention in the signal processing unit 6 described above.

By the way, the above description has been made for the case of a gas stove, but 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 heating power may be automatically adjusted in accordance with the temperature change to keep the temperature of the cooked food constant.

[0024]

As described above, according to the present invention, the discriminating means for discriminating 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 discriminating means is provided. Temperature setting means for setting a heating stop temperature for preventing scorching based on the temperature to be applied, and setting the heating stop temperature to a predetermined temperature for preventing ignition of oil if the temperature is not constant, When the output of the means is almost constant, that is, in the case of a pot with poor heat conduction in which the boiling state is detected in the temperature range of oil, the heating stop temperature for preventing burning can be set from the boiling detection temperature in the boiling state. It can also prevent scorching. Further, 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 setting of the heating stop temperature is changed by the temperature setting means according to the determination result of the determination means. Therefore, when the temperature of the oil reaches a predetermined temperature, the heating state is weakened and maintained at a constant temperature. If there is, 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. Can be.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a boiling detection method according to the first embodiment;

FIGS. 3A and 3B are explanatory diagrams of a method for setting an automatic fire-extinguishing temperature in cooking oil and a method for setting an automatic fire-extinguishing temperature in cooking water using a container having poor heat conduction.

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

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

[Explanation of symbols]

 Reference Signs List 1 burner 2 pan 4 gas supply control unit 5 temperature sensor 6 signal processing unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukiko Tani 1-1-52, Oka, Minami-ku, Minato-ku, Osaka Inside Harman Co., Ltd. (56) References JP-A-4-236012 (JP, A)

Claims (1)

(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 the bottom of a container into which the food is put and heated, and an output of the temperature detecting means being substantially If the output of the temperature detecting means is substantially constant, the heating stop temperature for preventing burning is set based on the substantially constant temperature, and if the output is not constant, Includes a temperature setting unit that sets a heating stop temperature to a predetermined temperature that prevents ignition of oil, and a heating control unit that stops a heating state of the heating unit according to the heating stop temperature. The determination as to whether the output of the detection means is substantially constant is continued during the cooking period, and the setting of the heating stop temperature is changed by the temperature setting means in accordance with the result of the determination by the determination means. Heat cooker.