JPH0544937A - Controller for kitchen range - Google Patents

Abstract

PURPOSE:To accurately sense a temperature at the time point when a temperature of a material to be cooked is equilibrated in a kitchen range having a temperature sensor for sensing the temperature in contact with a cooking vessel. CONSTITUTION:A control circuit 30 for deciding whether a temperature of a material to be cooked is equilibrated or not based on a sensed temperature T of a temperature sensor 2a, extracted at each 15 sea, calculates a first temperature difference at each 30 sea based on the extracted temperature T, and calculates a second temperature difference of last temperature data extracted to calculate the temperature difference and initial temperature data if continuous five first temperature differences fall within + or -2 deg.C. The case where the second temperature difference falls within a predetermined temperature or less is detected as an equilibrated state, and latest temperature data at this time is used as an equilibrated detected temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a temperature sensor for detecting the temperature by contacting a cooking container heated by a burner or the like, and based on the detected temperature, the temperature of the food in the cooking container is in an equilibrium state. The present invention relates to a control device for determining whether or not there is a stove.

[0002]

2. Description of the Related Art For example, in the case of a gas stove, a temperature sensor for detecting the temperature of the cooked food in contact with the cooking container is provided at the center of the stove burner in order to prevent burning of the cooked food and ignition of cooking oil. In some cases, heating control is performed such that heating is stopped or heating power is weakened when the temperature detected by the temperature sensor reaches a predetermined condition. In this case, even if the temperature of the cooked food reaches a certain temperature, the temperature detected by the temperature sensor has various values depending on the type of the cooking container and the heating power, and the temperature detected when the burning starts. Since the value varies depending on the type of cooking container and the heating power, it is difficult to set a constant temperature as the temperature for detecting the burning. Therefore, conventionally, in order to perform this kind of control, for example, Japanese Patent Publication No. 63-6710.
In the invention of Japanese Patent No. 6, the bending value for determining whether or not the cooked material has boiled is determined according to the degree of inclination of the temperature detected by the temperature sensor, and the temperature rise inclination becomes less than or equal to this bending value. The inflection point, that is, the time when the temperature of the cooked product reaches an equilibrium state is detected by making a determination, and the temperature that is higher than the detected temperature by a predetermined temperature is determined as the reference temperature for preventing sticking. is doing.

[0003]

However, according to the above method, the bending value for determining whether or not the food has boiled is determined by detecting the temperature rise slope before boiling. In order to ensure the control of non-sticking, it is necessary to perform sampling by the temperature sensor from the initial point of cooking before boiling, and in cases such as when cooking is started midway, non-sticking prevention is required. However, there is a problem that the control operation cannot be expected. In addition, if the reference time for judging the bending value is increased, the temperature variation within that time cannot be detected. On the contrary, if it is decreased, even if the temperature gradually rises instead of the equilibrium state ( There is a problem that it is misjudged as a bending value (because there is a limit).

According to the present invention, in a stove controller equipped with a temperature sensor that comes into contact with a cooking container, the temperature at the time when the food is boiled, that is, the temperature detected when the temperature of the food is in an equilibrium state is ensured. The purpose is to detect.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a temperature sensor in contact with a cooking vessel heated by heating means,
In the control device of the stove, which determines whether or not the temperature of the food in the cooking container is in an equilibrium state based on the temperature detected by the temperature sensor extracted at predetermined time intervals by the temperature extraction means, the equilibrium detection is performed. The means includes a first temperature difference calculating means for calculating a first temperature difference for each constant time of a small unit based on the detected temperature extracted, and a continuous predetermined number calculated by the first temperature difference calculating means. First determining means for determining whether each of the first temperature differences is within a predetermined temperature range, and the continuous when a predetermined number of consecutive first temperature differences is within the temperature range. A second temperature difference calculating means for calculating a second temperature difference between the last detected temperature and the first detected temperature extracted to calculate the predetermined number of first temperature differences, and the second temperature difference calculation. The second temperature difference calculated by the means is less than or equal to the predetermined temperature. And a second determining means for determining whether or not the temperature of the food is in an equilibrium state when the second temperature difference is less than or equal to the predetermined temperature. To do. In this case, the last detected temperature extracted for calculating the continuous predetermined number of first temperature differences is the equilibrium detected temperature indicating that the equilibrium state is detected,
The heating means may be controlled based on the equilibrium detected temperature.

[0006]

In the present invention, the temperature of the cooking container detected by the temperature sensor is extracted at predetermined time intervals, and the first temperature difference in small unit intervals is calculated based on the extracted detected temperature. When it is determined that the calculated predetermined number of first temperature differences are all within the predetermined temperature range, the last detected temperature among the detected temperatures used for calculating each temperature difference is The temperature difference from the first detected temperature is calculated as the second temperature difference, and when the second temperature difference is equal to or lower than the predetermined temperature, it is determined that the temperature of the cooked product is in the equilibrium state. Further, the heating control is performed with the last detected temperature when the equilibrium state is determined as the equilibrium detection temperature indicating that the equilibrium state is detected.

[0007]

According to the present invention, the first unit for every fixed time of a small unit
If it is determined for the predetermined number of first temperature differences that the temperature difference is within the predetermined temperature range, the predetermined number of first temperature differences is further added.
The equilibrium state is determined by determining whether the second temperature difference between the last detected temperature and the first detected temperature when the temperature difference is calculated is equal to or lower than a predetermined temperature. Therefore, in order to detect the temperature by touching the bottom of the cooking container, even if the detected temperature when the temperature of the food in the cooking container is in an equilibrium state varies depending on the type and heating power of the cooking container, It can be reliably detected that the temperature of the object has reached an equilibrium state. Also,
Even if cooking is resumed in the middle of a cooked food, if the temperature of the cooked food reaches a balanced state during heating, the balanced state can be immediately detected. In addition, since the equilibrium state is determined based on both the first temperature difference in small units that continue for a certain period of time and the second temperature difference that is based on the large unit time at the beginning and the end, erroneous determination does not occur. Furthermore, since the equilibrium state is quickly detected, if the last detected temperature when the equilibrium state is detected is the equilibrium detection temperature, the equilibrium detection temperature indicating the equilibrium state can be accurately detected, and the sticking prevention, etc. By determining the reference temperature for the temperature based on the equilibrium detected temperature, accuracy in heating control is improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in the drawings. FIG. 1 shows a gas table 1 equipped with a stove controller according to the present invention.
Two stove burners 2 and 3 are provided, and a grill burner 4 is provided inside the gas table 1 on the front surface 1 a of the gas table 1.
Grill door 4A for opening and closing the heating chamber of the grill provided with, each stove burner 2, 3 and point fire extinguishing buttons 5, 6, 7 for operating the grill burner 4, and each stove burner 2, 3 An operation panel 20 for setting the operating state of the grill burner 4 is provided. Each of the stove burners 2, 3 is provided with a temperature sensor 2a, 3a having a built-in thermistor for detecting the temperature of a cooking container such as a pot. Each temperature sensor 2a, 3a is provided by a spring (not shown). The gas table 1 is elastically supported upward, and when the cooking container is placed on the stove, the bottom of the cooking container pushes down the temperature sensors 2a, 3a, so that The temperature detection unit at the upper end is in pressure contact with the cooking container or the like and is in close contact therewith.

As shown in FIG. 2, the gas pipe 11 for supplying the fuel gas is divided into supply pipes 12, 13, 14 corresponding to the burners 2, 3, 4, respectively. Reference numeral 14 denotes main valves 12a, 13a, 14a which are opened / closed by operating respective point fire extinguishing buttons 5-7.
And the electromagnetic safety valves 12b, 13b, 1b that are opened by operating the point fire extinguishing buttons 5-7, respectively, and thereafter are kept open or closed by energization control by the control circuit 30.
4b are provided respectively, and further, the supply pipe 13 to the stove burner 3 is branched into two narrow pipes and merges, and one of them is an electromagnetic valve that is controlled to open and close for temperature control of the stove burner 3. A valve 13c is provided.

The supply pipes 12, 13 and 14 to the stove burners 2 and 3 and the grill burner 4 are provided with heat control provided near the point fire extinguishing buttons 5, 6 and 7 on the front face 1a of the gas table 1. A gas amount adjusting valve (not shown) is provided for adjusting the gas supply amount by operating the levers 5a, 6a and 7a. It should be noted that each of the burners 2 to 4 has ignition electrodes 15, 16 and 17 for performing spark discharge for ignition, and a thermocouple 15 for generating electromotive force by sensing combustion heat.
a, 16a, 17a, respectively.

The operation panel 20 has a stove burner 2, 3
With regard to the above, in order to perform appropriate overheat prevention control according to the cooking state, mode changeover switches 21 and 22 for switching between a simmering mode for performing a simmering dish using water and an oily substance mode using oil are provided. In addition, a cooking mode switch 23 for setting a cooking mode for high-temperature cooking in the stove burner 3 is provided, and an LED for displaying a selection state by each of the switches 21 to 23 is provided. In each of the stove burners 2 and 3, switching between the cooking mode and the oil mode can be alternately switched by pressing and operating the mode changeover switches 21 and 22.
In order to prevent the pottery mode from being easily selected because the temperature is controlled at (° C.), the pottery mode can be set only when the pottery mode switch 23 is pressed twice within 3 seconds. In the gas table 1 having the above configuration, the burners 2 to 4 are controlled by the control circuit 30 provided in the gas table 1.

The control circuit 30 is operated by a commercial power source,
It is composed mainly of microcomputers,
As control by the control circuit 30, the fire extinguishing buttons 5 to 5
The ignition control of each burner 2-4 and the misfire detection control based on each thermocouple 15a-17a are performed according to the operation of 7. As for the stove burners 2 and 3, overheat prevention control based on the detection temperature of the temperature sensors 2a and 3a during combustion is performed according to the operating states of the switches 21 to 23 on the operation panel 20, and the grill burner is also provided. With respect to No. 4, the heating time is controlled by the cooking timer.

The overheat prevention control grasps the temperature of the food in the cooking container heated by the stove burners 2 and 3 based on the temperature T detected by the temperature sensors 2a and 3a, and the cooking container used. In consideration of cooking conditions and cooking conditions, if there is a risk of burning or ignition while enabling smooth cooking, stop the fuel supply to the stove burners 2 and 3 and proceed with burning. In order to suppress and prevent ignition, an appropriate cut temperature Tc corresponding to each cooking state is determined, and an automatic fire extinguishing operation is performed based on the determined cut temperature Tc. Here, different control operations are performed according to each cooking mode selected by the mode changeover switches 21 and 22 of the operation panel 20.

The outline of the overheat prevention control in the stove burners 2 and 3 will be described below by taking the stove burner 2 as an example. First, the control operation in the stewed mode will be described with reference to FIG. When the ignition of the stove burner 2 is started by the point fire button 5 and heating is started, it is determined whether the temperature T of the cooking container detected by the temperature sensor 2a is 90 ° C or higher or lower than 90 ° C. However, when the temperature is lower than 90 ° C. (YES in step 101), the cut temperature Tc, which is a reference for whether or not to perform the automatic fire extinguishing operation, is set to the initial time Δt1 until the detected temperature T reaches 90 ° C. to 100 ° C. The initial setting control is set accordingly (step 102). After the detected temperature T reaches 100 ° C., the process proceeds to step 105, and the determination for equilibrium detection is performed as described later.

On the other hand, if the detected temperature T is already 90 ° C. or higher when the heating is started (NO in step 101), the determination for the above initialization control cannot be made. Instead, 240 ° C. is uniformly set as the cut temperature Tc regardless of the speed of the temperature rise of the detected temperature T (step 103). When the detected temperature T is 90 ° C. or higher, the detected temperature T is 1
It is determined whether the temperature is 00 ° C. or higher, and if it is lower than 100 ° C. (NO in step 104), 100 ° C.
When the temperature is 100 ° C. or higher (YES in step 104), the equilibrium detection control for determining whether or not the temperature of the cooked food has reached the equilibrium state is started.

In the equilibrium detection control, when the equilibrium state is detected (YES in step 105), the equilibrium basic temperature Te which is the reference temperature for determining the cut temperature Tc according to the equilibrium state is It is determined based on the equilibrium detected temperature Th at the time of detection (step 1
06). When the equilibrium state is detected for the first time, the equilibrium basic temperature Te is determined as the equilibrium basic temperature Te as the equilibrium detected temperature Th. After that, basically, the equilibrium detected temperature Th is equal to the equilibrium basic temperature Te. In many cases, the equilibrium detection temperature Th does not always become the equilibrium basic temperature Te as it is, depending on the change state of the equilibrium detection temperature Th. Details of the method of determining the equilibrium basic temperature Te will be described later.

When the equilibrium basic temperature Te is determined, a new cut temperature Tc is used instead of the cut temperature Tc initialized in the above step 102 or step 103.
Is determined based on the equilibrium basic temperature Te (step 107). Here, the method of calculating the cut temperature Tc is selected according to the equilibrium basic temperature Te, and as shown in FIG. 4, when the equilibrium basic temperature Te is lower than 130 ° C. (YES in step 121), the cut temperature Tc is set. Tc is uniformly set to 150 ° C. (step 122), and the equilibrium basic temperature Te is set.
If the temperature is 130 ° C or higher (in step 121, N
O), Tc = Te + 20 ° C. is selected, and a temperature obtained by adding 20 ° C. to the equilibrium basic temperature Te is determined as the cut temperature Tc (step 123). This makes it possible to calculate an appropriate cut temperature Tc according to the cooking container, so that the fire extinguishing operation is performed before it is sufficiently heated, or the heating is continued forever when the fire extinguishing operation is required. There is no end.

When the equilibrium state is not detected in step 105 (NO), while the detected temperature T is 100 ° C. or more and less than 200 ° C. (NO in step 108),
When the routine proceeds to step 105, every time the detected temperature T is newly extracted every 15 seconds, it is repeatedly judged whether or not it is in the equilibrium state. Thereafter, in step 109, it is determined whether or not the detected temperature T has reached each cut temperature Tc with respect to the cut temperature Tc newly determined in accordance with the equilibrium detection, not limited to the cut temperature Tc in the initial setting. , Cut temperature Tc
If it does not reach (NO), the process proceeds to step 105, and heating is continued and equilibrium detection is repeatedly performed until the detected temperature T reaches the cut temperature Tc.

On the other hand, when the detected temperature T reaches the cut temperature Tc (YES in step 109), it is preferable to perform the fire extinguishing operation without starting the fire extinguishing operation immediately, or it is necessary to perform the fire extinguishing operation. It is determined whether or not there is a predetermined fire extinguishing condition. If the predetermined fire extinguishing condition is not satisfied (N in step 110,
O), the fire extinguishing operation is not performed even if the cut temperature Tc is reached, the process proceeds to step 109, and it is repeatedly determined whether or not the temperature is equal to or higher than the cut temperature Tc. To do. When the temperature is equal to or higher than the cut temperature Tc and the predetermined fire extinguishing condition is satisfied (YES in step 110), the fire extinguishing operation is performed according to a predetermined sequence (step 111), and the electromagnetic safety valve 12b.
Closed to stop the supply of fuel gas to the stove burner 2,
A buzzer, a lamp, etc. notify the fire extinguishing operation.

Next, the initialization control in step 102 will be described. Since boiled food cooking is premised on cooking with water, if heating is continued, an equilibrium state where the temperature of the cooked food does not rise and becomes a constant temperature appears. Therefore, in the overheat prevention control in the boiled food mode, as will be described later, it is detected that the temperature of the cooked food is in an equilibrium state, and the cut temperature for overheat prevention is detected based on the equilibrium detected temperature Th at that time. The basic operation is to properly determine Tc. However, even in the case of cooking boiled food, in the case of curry or stew, stir-frying is performed at the beginning of cooking, and then boiling water is added to simmer. In such a case, if the cutting temperature Tc is too low, the control operation for preventing overheating is performed during the frying process, and cooking cannot be performed. Further, in cooking boiled foods, the intended cooking is not always performed in order from the initial stage, and there is also a case where the food that has been once cooked and cooled is reheated. One of the reheating processes for cooking simmered food is reheating curry or stew. However, these curries and stews lose their fluidity when cooled, so unless the food is reheated after adding hot water, the temperature of the cooked food is unlikely to reach an equilibrium state. However, in the determination of equilibrium detection described below, equilibrium may not be detected. In such a case, if the cut temperature Tc is not properly set,
Contrary to the case of the above stir-fry treatment, there is a possibility that carelessness will progress.

In consideration of the above points, the initial setting control is performed by distinguishing at the beginning of heating in the cooking mode, at the time of frying in curry or stew, and at the time of boiling including reheating in which the equilibrium state is difficult to detect, The initial setting control for appropriately determining the cut temperature Tc is performed. In the initial setting control, the detected temperature T is 90 as shown in FIG.
When the temperature reaches ℃ (YES in step 1), the measurement of the initial time Δt1 is started (step 2), and the detected temperature T
Reaches 100 ° C (YE in step 3)
S), and the measurement of the initial time Δt1 is finished (step 4).

As shown in FIG. 6, when the initial time Δt1 exceeds 10 seconds (Δt1> 10 seconds) and the temperature rise of the detected temperature T is slow (NO in step 5),
Judging from the initial stir-fry process in boiled dishes, it was judged that a large amount of water and other cooked items were put in the cooking container, and the temperature rise was slow, especially when the curry or stew was reheated, and equilibrium detection could not be performed. Assuming a case, a relatively low cutting temperature Tc of 200 ° C. is initially set as a temperature for preventing the progress of charring in such reheating of curry or stew (step 6).

As shown in FIG. 7, the initial time Δt1 is 10
If the temperature rise is fast (Δt1 ≦ 10 seconds) or less (YES in step 5), the heating should be stopped in the frying process, assuming that the frying process is being performed at the beginning of cooking the cooked food. A high cutting temperature Tc of 240 ° C. is initially set so that cooking can be smoothly performed (step 7). Note that the above step 10
This initialization control performed based on the determination result of 1 is
Ignition operation is performed by the point fire extinguishing button 5 and is performed only once at the beginning of cooking when the temperature is started to be detected by the temperature sensor 2a, and thereafter, the detected temperature T is 90 ° C. by adding water during cooking. If it goes below, it will not be done.

Next, the control relating to the detection of the equilibrium state in step 105 will be described. Usually, in cooking simmered food, since the food contains water, the temperature of the food in the pan serving as a cooking container becomes substantially constant when heating is continued. At this time, since the heat given to the cooking container and the heat released from the cooking container are balanced, when the temperature of the cooked product becomes constant, the temperature of the cooking container does not rise so much, A certain temperature continues. But,
Even if the temperature of the cooked food becomes constant, the temperature of the pan or the like as the cooking container is not necessarily the same as the temperature of the cooked food, and the temperature detected by the temperature sensor 2a contacting the bottom of the cooking container is the material of the pan. , The value varies depending on the thickness and the like, and even if the cooking container is the same, it varies depending on the amount of heating amount, and the temperature detected by the temperature sensor 2a is not always the same temperature. Therefore, in the present embodiment, attention is paid to the tendency that the detected temperature T of the temperature sensor 2a becomes almost constant temperature as an equilibrium state, and when the equilibrium state is detected, it is assumed that the temperature of the cooked food becomes constant. At this time, the equilibrium detection temperature Th is determined, and the heating power is controlled accordingly.

The control for detecting the equilibrium state in this embodiment will be described below with reference to FIG. In the equilibrium detection control of this embodiment, when the detected temperature T reaches 100 ° C., extraction (sampling) of the detected temperature T by the temperature sensor 2a is started as temperature data for detecting the equilibrium state. The extraction of this temperature data is as shown in FIG.
After that, every 15 seconds, the operation is performed one after another, and the continuous 7 temperature data extracted every 15 seconds are sequentially stored (step 11).

Next, the temperature differences ΔT (n-4), ΔT for 30 seconds based on the seven temperature data extracted every 15 seconds.
(N-3), ΔT (n-2), ΔT (n-1), ΔTn
Is calculated as the first temperature difference (step 12). As shown in FIG. 9, when the latest temperature data is extracted, and these five temperature differences are represented by Tn, the six temperature data extracted up to that point are T (n-
6), T (n-5), T (n-4), T (n-3), T
Assuming that (n-2) and T (n-1), the above temperature differences are T (n-4) -T (n-6) as values calculated based on the temperature data. , T (n-3)
-T (n-5), T (n-2) -T (n-4), T (n
-1) -T (n-3) and Tn-T (n-2), respectively. These temperature differences are calculated and calculated each time each temperature data represented by the above equations is extracted.

The first condition for determining whether or not the equilibrium state is detected is that when the detected temperature T is extracted, five consecutive temperature differences ΔT (n−) calculated as described above.
4),-, and ΔTn are all within ± 2 ° C. That is, when the latest temperature data is extracted, it is determined that the five temperature differences as the first temperature difference are continuously within ± 2 ° C.

The first condition may be satisfied even when the temperature of the cooked food is not in an equilibrium state and is not a constant temperature. For example, in each of the five determinations,
The temperature change is about + 2 ° C., which is the limit limit, and the first condition may be satisfied even when the temperature of the cooked food continues to rise. Therefore, the latest temperature data Tn for five consecutive temperature differences when the first condition is satisfied
Between the oldest temperature data T (n-6) and Tn-T (n
-6) is calculated as the second temperature difference, and the second temperature difference is set to be + 4 ° C or less, that is, Tn-T (n-6) ≤ + 4 ° C as the second condition. There is. This is based on the fact that when the temperature of the cooked product reaches a constant temperature, the temperature rise of the cooking container becomes extremely small.

When the first temperature difference satisfies the above first condition (YES in step 13), the second temperature difference is calculated (step 14), and the second temperature difference is the second. It is determined whether or not the condition is satisfied. When the first condition is not satisfied (NO in step 13), the following steps are omitted, the process proceeds to step 17, waits 15 seconds since the temperature data was previously extracted, and waits 15 seconds. After that, the process proceeds to step 11 and the temperature data is extracted again.

When the second condition is satisfied (YES in step 15), it is determined that the equilibrium state has been detected, and it is determined that the detected temperature T extracted as the latest temperature data at that time has detected the equilibrium state. Equilibrium detection temperature Th
Is determined (step 16). When the second condition is not satisfied (NO in step 15), step 16 is omitted and the process proceeds to step 17 to wait for 15 seconds.

The control for detecting the equilibrium state with the above discrimination is performed by deleting the oldest temperature data when the latest detected temperature T is extracted as the temperature data at 15-second intervals. The temperature data is repeatedly performed many times, and when both of these two conditions are satisfied, it is first determined in the present invention that the temperature of the cooked food is a constant temperature, and the latest temperature data at that time is determined. The detected temperature T extracted as is determined as the equilibrium detected temperature Th when the equilibrium state is detected. As a result, in this embodiment,
Since the temperature sensor 2a contacts the bottom of the cooking container to detect the temperature, the detected temperature T when the temperature of the food in the cooking container is in an equilibrium state varies depending on the type of the cooking container and the heating power. Also, it is possible to reliably detect that the temperature of the cooked food is in an equilibrium state. Further, regarding the cooked food once heated, even if the cooking is restarted from the middle, if the temperature of the cooked food reaches the equilibrium state during heating, the equilibrium state can be immediately detected. In addition, since the equilibrium state is determined based on both the first temperature difference in small units that continue for a certain period of time and the second temperature difference that is based on the first and last large units of time, erroneous determination does not occur. Furthermore, since the equilibrium state is quickly detected, by setting the last detected temperature T when the equilibrium state is detected as the equilibrium detection temperature Th,
The equilibrium detection temperature Th indicating the equilibrium state can be accurately detected, and the heating control accuracy is improved.

Next, a method of determining the equilibrium basic temperature Te determined in step 106 will be described with reference to FIG. In the present embodiment, the equilibrium detection detects the temperature T detected by the temperature sensor 2a that contacts the bottom of the pan and detects the temperature as the equilibrium state when the two conditions are satisfied, as described above. As described above, the determination for detection is repeatedly performed after the equilibrium state is once detected. Therefore, the equilibrium detection temperature Th determined when the equilibrium state is detected is determined every time the equilibrium state is detected. May change. On the other hand, in the present embodiment, the cut temperature Tc determined based on the equilibrium basic temperature Te is determined based on only the value of the equilibrium basic temperature Te, as described above, and the tendency of change in the equilibrium basic temperature Te Since the temperature is not considered at all, the cut temperature Tc directly changes when the equilibrium basic temperature Te changes.

Therefore, the equilibrium basic temperature Te, which is determined based on the equilibrium detection temperature Th, is immediately changed according to the change in the equilibrium detection temperature Th, and the cut temperature Tc changes each time the equilibrium state is detected. If so, the cut temperature Tc originally determined for limiting the heating will change one after another in response to the detection of the equilibrium state that changes subtly, and the appropriate cut temperature according to the cooking state. It becomes impossible to set Tc, and in some cases, it may not serve as the cut temperature Tc. Therefore, in the present embodiment, in order to appropriately determine the cut temperature Tc even when the equilibrium state is repeatedly detected and the determined equilibrium detection temperature Th changes each time, the following is performed. The appropriate equilibrium basic temperature Te is determined according to the change state of the equilibrium detection temperature Th.

When the equilibrium detection is performed for the first time (YES in step 21), the equilibrium detection temperature Th determined at that time is determined as the equilibrium basic temperature Te (step 22). On the other hand, when the equilibrium detection has already been performed and the equilibrium basic temperature Te has been determined (NO in step 21), the equilibrium detection is performed as follows according to the determined equilibrium detection temperature Th. Basic temperature T
Determine e.

As shown in FIG. 11, when the equilibrium detected temperature Th becomes lower than the previous equilibrium basic temperature Te (see FIG. 1).
1 (Tb ≦ Ta) (Y in step 23)
ES), it is considered that the temperature detected by the temperature sensor 2a becomes low because the heating power is weakened by adjusting the heating power of the stove burner 2. Therefore, the changed equilibrium detection temperature Th is directly used as the equilibrium basic temperature Te. Change (step 22). As a result, the cut temperature Tc can be set lower in accordance with the newly determined equilibrium basic temperature Te, and when charring begins, it can be detected more reliably.

When the equilibrium detection is performed once and then the equilibrium detection is performed again, if the current equilibrium detection temperature Th is higher than the previous equilibrium basic temperature Te (step 2
No in 2), the previous equilibrium detection was performed and the equilibrium basic temperature T
Only after e is determined and before the current equilibrium detection is performed, a rapid temperature increase indicating that the heating power is strengthened by the thermal power adjustment is detected (step 24). In YES), the new equilibrium detected temperature Th is changed as the equilibrium basic temperature Te (step 2
2) The rapid temperature rise that indicates that the heating power is strengthened by the thermal power adjustment is not detected, and the equilibrium detection temperature Th
Is gradually increased (in step 24, N
O), the equilibrium basic temperature Te is maintained as it is without changing the equilibrium basic temperature Te. Here, what is recognized as a rapid temperature rise after the equilibrium detection is A in FIG.
As shown in, the case where the temperature rise of the detected temperature T extracted every 15 seconds for equilibrium detection for 30 seconds is 3 ° C. or more is the case where the temperature is detected three times in succession. That is,
If the above detection is made, the burner's heating power may have been strengthened, and although the temperature of the food to be cooked itself does not change, only the temperature of the pan etc. as a cooking container rises, and then the equilibrium is reached. Detected (Tb> T in FIG. 12)
In case a) is considered, the equilibrium basic temperature Te is changed because once the equilibrium state is detected, there is a temperature rise of about 6 ° C or more in about 60 seconds due to the change in thermal power. To do.

On the contrary, a rapid temperature rise is not recognized,
If only the equilibrium detection temperature Th is gradually increasing, there is a high possibility that the water content is gradually decreasing in stewed dishes such as curry, so the cutting temperature Tc may be changed to prevent burning. Since this is an unfavorable case, the equilibrium basic temperature Te is not changed when the equilibrium detection temperature Th simply increases. Thereby, even if the equilibrium detection temperature Th is repeatedly changed and the equilibrium detection temperature Th is changed at that time, if the equilibrium detection temperature Th is lowered, the cut temperature Tc is immediately lowered. When the temperature is changed to a high value, the cut temperature Tc is not changed uniformly, and the cut temperature Tc is limited only when a rapid temperature rise based on the thermal power adjustment is recognized.
Since c is changed, an appropriate cut temperature Tc can be set. Even if the equilibrium state is once detected and the cut temperature Tc is set based on the equilibrium state, if the detected temperature T falls below 100 ° C., the cut set by equilibrium detection is performed. The temperature Tc is released and 250 ° C. is initialized.

Next, the determination of the fire extinguishing condition in step 110 will be described. Even if the detected temperature T has reached the cut temperature Tc determined as described above, as long as it is possible to detect a situation in which the intervention of the cook is clearly recognized, the cook can make some appropriate adjustment. Since the treatment is performed, the fire extinguishing operation is not necessarily required, but when the cut temperature Tc is reached and there is no sign of the intervention of the cooker, the charring of the cooked food progresses. It is preferable to perform the automatic fire extinguishing operation because a cooking problem occurs.

The fire extinguishing conditions are set based on the above viewpoints. Here, the cause that the temperature T detected by the temperature sensor 2a becomes equal to or higher than the cut temperature Tc is that the cooking container such as a pan of the cooking container is operated by the user. The following method is used to determine whether it is due to operation or due to burning. In order to determine whether or not the fire extinguishing condition is satisfied, after the detected temperature T reaches the cut temperature Tc, the detected temperature T of the temperature sensor 2a is repeatedly extracted every 0.32 seconds, and the temperature obtained by the extraction is extracted. Two types of discrimination are performed based on the data.

In the first judgment, regarding the continuous four temperature data obtained by extracting the detected temperature T every 0.32 seconds, the maximum temperature Tmax and the minimum temperature Tmin of the four temperature data are determined. The temperature difference ΔTm is calculated, and it is determined whether or not the temperature difference ΔTm is less than the predetermined temperature difference Tx (4 ° C.). This determination is also made for four temperature data obtained by deleting the oldest temperature data when new temperature data is extracted 0.32 seconds later, and then 0.32.
All temperature differences Δ obtained based on temperature data extracted for 20 seconds (or 5 seconds) repeated every second Δ
Regarding Tm, all of them have a predetermined temperature difference Tx (4 ° C) continuously.
When it is less than, it is determined that the first extinguishing condition is satisfied.

Regarding the four temperature data extracted every 0.32 seconds, the fact that the temperature difference ΔTm between the maximum temperature Tmax and the minimum temperature Tmin is less than the predetermined temperature difference Tx (4 ° C.) means that the cooking container is a stove. This indicates that the temperature sensor 2a of the burner 2 is continuously in contact with the temperature sensor 2a. For example, when the user shakes the cooking container, the temperature sensor 2a
Since a separates from the cooking container and the heating power of the stove burner 2 directly heats the temperature sensor 2a,
As shown in FIG. 13, the detected temperature T instantly becomes extremely high. Therefore, the maximum temperature Tmax and the minimum temperature Tm
The temperature difference ΔTm from in greatly exceeds the predetermined temperature difference Tx (4 ° C.). The first fire extinguishing condition detects a case where there is an intervention by the user (cooker) such as shaking of the pan, and in such a case, since the fire extinguishing operation is not necessary, even if the cut temperature Tc is reached. Fire extinguishing conditions are not met.

On the contrary, when the cut temperature Tc is reached and the cook's intervention is not recognized in the above determination, it is considered that the cut temperature Tc has been reached because the cooked food is beginning to burn, and in that case As shown in FIG.
The temperature rise gradually progresses. Therefore, the final temperature data is always higher than the initial temperature data. Therefore,
When the first extinguishing condition is satisfied, the temperature difference ΔTp between the last temperature data and the first temperature data for 20 seconds (or 5 seconds) when the first extinguishing condition is satisfied is further obtained. , The temperature difference ΔTp ≧ 0 is set as the second fire extinguishing condition.

The above is summarized and explained in FIG. First, it is determined whether or not there is a pan swing, and when the pan swing is not detected (ΔTm <4 ° C.) (NO in step 31), a timer for counting the duration is activated (step 32). , The duration that the pan swing is not detected,
It is determined whether 20 seconds (or 5 seconds) has elapsed. 20
If it has not continued for 2 seconds (or 5 seconds) (step 33
If NO in step 31), the pan swing detection is repeatedly determined in step 31.

On the other hand, when the pan swing is detected (ΔTm ≧
4 ° C.) (YES in step 31), it is determined that the first fire extinguishing condition is not satisfied, and the timer for measuring the duration time in which the pan swing is not detected is temporarily reset (step 34), and then the step 31 is performed. After the transfer, determine whether or not the pan is shaken again. When the pan swing is not detected for 20 seconds (or 5 seconds) (YES in step 33), it is determined that the first extinguishing condition is satisfied, and the last temperature in this 20 seconds (or 5 seconds) is determined. It is determined whether or not the temperature difference ΔTp between the data and the first temperature data is 0 or positive.

When the temperature difference ΔTp is 0 or a positive value (YES in step 35), it is determined that the extinguishing condition is satisfied, as the case where there is a possibility of burning.
It is determined whether the cooking mode is completed (step 36). Temperature difference Δ
If Tp is negative (N in step 35)
O), it is determined that the fire extinguishing conditions are not satisfied, and step 31
Move to and detect the pan swing again. Note that the above first
20 seconds or 5 seconds is set as the duration of the state in which the pan swing is not detected under the fire extinguishing condition, and the cut temperature Tc is determined based on the equilibrium detected temperature Th when the equilibrium state is detected in step 105 above. If 20 seconds is selected, the above step 102,
When the fire extinguishing condition is determined by the cut temperature Tc initially set in 103, 5 seconds is selected. In the latter case, the reason why the duration time is shortened to 5 seconds is that oil is often used in this case. This is because there is a risk. In addition to the determination of the extinguishing condition based on the cut temperature Tc, when the detected temperature T reaches 290 ° C., the extinguishing operation is immediately performed as an error detection.

Next, the control operation in the oil product mode will be described. Since the oil product mode is a mode used when deep-fried food such as tempura is used, in the oil product mode, a control operation for automatically extinguishing fire is performed to prevent an oil fire. The standard temperature for automatic fire extinguishing is determined as the oil fire protection level. Hereinafter, description will be given with reference to FIG.

In the oil mode, when the temperature T detected by the temperature sensor 2a reaches 220 ° C. (step 20)
If YES in 1), the timer starts counting (step 202), and at the same time, extraction of temperature data every 0.32 seconds is started. Then, it is determined whether or not there is a pan shaking intervention by the user based on the four temperature data that are continuously extracted. This pan swing determination method is based on the temperature difference ΔT between the highest temperature and the lowest temperature of four consecutive temperature data.
m is determined, and it is determined whether or not the temperature difference ΔTm is 4 ° C. or more. Then, ΔTm ≧ 4 ° C. is changed from 220 ° C. to 2 °
If it is detected 5 times at 40 ° C, it is determined that the pan has shaken.

When there is no user intervention and the pan swing is not detected by the time the detected temperature T reaches 240 ° C. (NO in step 203), when the temperature reaches 240 ° C. (YES in step 204), The time measurement of the timer is ended (step 205), and the measurement of the time required for the temperature to rise from 220 ° C to 240 ° C is completed. When the measured temperature rise time t0 is 25 seconds or less (YES in step 206), it is considered that the amount of oil in the pan is small and it is easy to ignite, so the oil fire prevention level is set to 24.
Set as low as 0 ° C. (step 207).

On the contrary, when the temperature rise time t0 is longer than 25 seconds (NO in step 206), it is considered that the amount of oil in the pan is sufficiently large, and therefore the oil fire prevention level is set so that cooking can be smoothly performed. Is set as high as 260 ° C. (step 208).

On the other hand, when the pan shaking is detected (ΔTm ≧ 4 ° C. is detected 5 times) before reaching 240 ° C. (YES in step 203), the timer is timed when the pan shaking is detected. Stop (step 209) and set the oil fire prevention level to 260 ° C. (step 20)
8). Until the detected temperature T reaches the set oil fire prevention level (NO in step 210), wait until each temperature is reached, and if the detected temperature T reaches the oil fire prevention level (YES in step 210), extinguishing conditions It is determined whether or not is satisfied. The fire extinguishing conditions are the same as in the case of the above stewed mode, there is no user intervention such as shaking of the pan in 5 seconds, during which the temperature rise is recognized, and the temperature difference ΔT
This is the case where p ≧ 0. If the fire extinguishing condition is not satisfied (NO in step 211), the fire extinguishing condition is repeatedly determined while the oil fire prevention level is reached. When the extinguishing condition is satisfied (Y in step 211)
ES), the supply of the fuel gas is stopped by a predetermined fire extinguishing operation, and the fire extinguishing operation is notified by a buzzer, a lamp or the like (step 212).

As described above, according to the present invention, the temperature sensor 2
In order for a to contact the bottom of the cooking container to detect the temperature,
Even if the detected temperature when the temperature of the cooked food in the cooking container is in the equilibrium state varies depending on the type of the cooking container and the heating power, it can be reliably detected that the temperature of the cooked food is in the equilibrium state. Also, with regard to the cooked food,
Even if cooking is restarted from the middle, if the temperature of the cooked product reaches an equilibrium state during heating, the equilibrium state can be immediately detected. In addition, since the equilibrium state is determined based on both the first temperature difference in small units that continue for a certain period of time and the second temperature difference that is based on the first and last large units of time, erroneous determination does not occur. Furthermore, since the equilibrium state is quickly detected, if the last detected temperature when the equilibrium state is detected is the equilibrium detection temperature, the equilibrium detection temperature indicating the equilibrium state can be accurately detected, and the sticking prevention, etc. By determining the reference temperature for the temperature based on the equilibrium detected temperature, accuracy in heating control is improved.

In this embodiment, the detected temperature is extracted every 15 seconds with the predetermined time of 15 seconds, and the small unit constant time is 30 seconds which is twice the predetermined time, and the first temperature is obtained every 15 seconds. Although the difference was calculated, the fixed time of a small unit was set to 15 seconds, which is a predetermined time, or 45 seconds, which is three times the predetermined time,
The first temperature difference may be calculated every second. In this case, the former is based on six pieces of temperature data, and the temperature difference ΔT (n-4) = T (n-4) -T (n-5) ΔT (n-3) = T (n-3) -T. (N-4) is represented by ΔTn = Tn−T (n−1), and the latter is based on eight pieces of temperature data, and the temperature difference ΔT (n−4) = T (n−4) −T ( n-7) ΔT (n-3) = T (n-3) -T (n-6) --- ΔTn = Tn-T (n-3). Further, in the boiled food mode in the present embodiment, not only boiled food cooking in which only water is simply used for cooking, but curry, stew, etc. are pre-stirred with oil and then boiled water is added. It also supports complex cooking. In addition, even if the curry or stew that has been cooked once is reheated, it is devised so that it can be cooked smoothly, which makes it extremely convenient to use in ordinary cooked stews. In the above example,
Although the one in which the stove burner 2 is extinguished based on the cut temperature Tc as the reference temperature is shown, it may be one in which the heating power of the stove burner is weakened.

[Brief description of drawings]

FIG. 1 is a perspective view of the appearance of a gas table showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a gas table according to an embodiment of the present invention.

FIG. 3 is a flow chart showing a basic operation in a cooking mode in the gas table according to the embodiment of the present invention.

FIG. 4 is a flow chart showing a cut temperature determining operation in a cooking mode of the gas table according to the embodiment of the present invention.

FIG. 5 is a flow chart showing initial setting control in a cooking mode of the gas table according to the embodiment of the present invention.

FIG. 6 is a diagram showing an example of changes in the detected temperature during cooking of cooked food for explaining the initial setting control of the cooked mode of the gas table according to the embodiment of the present invention.

FIG. 7 is a diagram showing changes in the detected temperature at the time of stir-frying in cooked food for explaining the initial setting control of the cooked mode of the gas table according to the embodiment of the present invention.

FIG. 8 is a flow chart showing the equilibrium detection control in the cooking mode of the gas table according to the embodiment of the present invention.

FIG. 9 is a time chart for explaining extraction of temperature data and calculation of a temperature difference in the equilibrium detection control in the cooked mode of the gas table according to the embodiment of the present invention.

FIG. 10 is a flow chart showing a method for determining an equilibrium basic temperature in a cooking mode of a gas table according to an embodiment of the present invention.

FIG. 11 is a time chart showing an example of a change state of the detected temperature for explaining the method of determining the equilibrium basic temperature in the cooking mode of the gas table according to the embodiment of the present invention.

FIG. 12 is a time chart showing another example of the change state of the detected temperature for explaining the method for determining the equilibrium basic temperature in the cooked mode of the gas table according to the embodiment of the present invention.

FIG. 13 is a time chart showing an example of changes in the detected temperature when the pan is shaken to explain the operation of determining the extinguishing conditions in the cooked mode of the gas table according to the embodiment of the present invention.

FIG. 14 is a time chart showing an example of changes in the detected temperature at the time of burning, for explaining the operation of determining the extinguishing conditions in the cooked mode of the gas table of the embodiment of the present invention.

FIG. 15 is a flow chart for explaining an operation of determining a fire extinguishing condition in a cooked mode of a gas table according to the embodiment of the present invention.

FIG. 16 is a flow chart showing a basic operation in an oil mode in the gas table according to the embodiment of the present invention.

[Explanation of symbols]

2 stove burner (heating means) 2a temperature sensor 30 control circuit (stove control device, temperature extraction means, equilibrium detection means, first temperature difference calculation means, second temperature difference calculation means, first determination means , Second determination means)

Claims (2)

[Claims] 1. A temperature sensor for contacting a cooking container heated by heating means, wherein the temperature of the food in the cooking container is based on the temperature detected by the temperature sensor extracted at predetermined time intervals by the temperature extracting means. In the control device of the stove for determining whether or not is in the equilibrium state, the equilibrium detection means calculates the first temperature difference in small unit constant time intervals based on the extracted detected temperature. Difference calculating means, first determining means for determining whether or not a predetermined number of consecutive first temperature differences calculated by the first temperature difference calculating means are within predetermined temperature ranges, respectively, When the predetermined number of first temperature differences that are determined to be within the temperature range are determined, the second detected temperature and the first detected temperature that are extracted to calculate the continuous predetermined number of first temperature differences Second temperature for calculating temperature difference And a second determining means for determining whether or not the second temperature difference calculated by the second temperature difference calculating means is less than or equal to a predetermined temperature, wherein the second temperature difference is the predetermined temperature. The control device for the stove characterized by determining that the temperature of the cooked product is in an equilibrium state in the following cases. 2. The method according to claim 1, wherein the last detected temperature is an equilibrium detection temperature indicating that the equilibrium state has been detected, and the heating means is controlled based on the equilibrium detection temperature. Control device.