JPH0462315A - Control device for cooking stove - Google Patents

Abstract

PURPOSE:To make it possible to cook smoothly by a method wherein the title device has a gradient calculation means which obtains the temperature ascent to the time of a detected temperature by a temperature sensor, and based the gradient calculated by the gradient calculation means, a first heating control function or a second heating control function is automatically selected. CONSTITUTION:For control to prevent over-heating from happening, respective control devices such as a low cut control unit 31a which performs low cut operation to prevent fuel from being fed when the temperature of an object to be cooked detected by a temperature sensor 2b has become approximately l30 deg.C or higher, a high cut control unit 31b which performs high cut operation for which the limit temperature is raised to approximately 250 deg.C, and an automatic selection unit 31c which automatically selects the low cut operation or high cut operation, based on a detected temperature T detected by the temperature sensor 2b are provided. The automatic selection unit 31c calculates a temperature ascent to the time of the detected temperature T by the temperature sensor 2b, as a gradient G, and automatically selects the low cut operation or high cut operation in proportion to the gradient G.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stove control device that stops heating or weakens heating power when the temperature detected by a temperature sensor reaches a predetermined condition.

[Prior art] For example, some gas stoves are equipped with a temperature sensor in the center of the stove burner that contacts the cooking container to detect the temperature of the food to be cooked. Some devices perform heating control that stops heating or weakens the heating power when the temperature reaches .

The temperature for this heating stop, etc. is a relatively low temperature of around 130°C to prevent burning in water dishes such as simmered dishes, and even higher temperatures such as oil dishes such as tempura. Two temperatures, approximately 230° C., are set to prevent the cooking oil from igniting, and the desired heating control temperature is selected by a changeover switch operated by the user.

[Problem to be solved by the invention] However, in such a stove, if the selection operation by the user is incorrect and, for example, a high temperature such as 230°C is selected for cooking with water, the stove will boil down and the moisture will disappear. Even if the temperature of the food to be cooked reaches 130°C, the heating power does not weaken, resulting in burnt food, or conversely, if the selection operation is incorrect when cooking with oil, the heating power does not weaken even when the temperature of the food reaches 130°C.
Problems such as heating stopping or heating power becoming weak before the temperature rises to about 80'C occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stove control device that eliminates these problems and allows smooth cooking.

[Means for Solving the Problems] The present invention provides a first heating control function that includes a temperature sensor that detects the temperature of an object to be cooked heated by a heating means, and that controls the heating means at a first predetermined temperature. and a second heating control W function that controls the heating means at a second predetermined temperature higher than the first predetermined temperature, the temperature increase of the temperature detected by the temperature sensor over time. It is a technical means to have an inclination calculation means to calculate the calculated inclination, and to automatically select the first heating control function and the second heating control function based on the inclination calculated by the inclination calculation means.

Also, determine whether the slope becomes smaller than a predetermined value,
It is preferable that the first heating control function is automatically selected when the slope is smaller than a predetermined value.

[Function] In the present invention, the temperature rise over time of the temperature detected by the temperature sensor is calculated as a slope, and as in the case of cooking with water, if the specific heat of the food to be cooked is large and the temperature rise is slow, or if it boils due to heating, When the temperature reaches a constant equilibrium state,
As in the case of oil dishes such as fried foods, the specific heat of the food to be cooked is small and the temperature rises quickly, and when heated, the temperature continues to rise and the temperature does not reach a constant equilibrium state. It can be easily distinguished from the slope.

Therefore, for example, if it is detected that the slope is below the predetermined value before the first predetermined temperature is detected, it is determined that the boiling state is occurring in a water dish, and the first heating control function is activated. Then, heating control is performed at the first predetermined temperature, for example, heating is stopped or the heating power is weakened.

Conversely, if it is not detected that the slope is less than or equal to the predetermined value before the first predetermined temperature is detected when cooking with oil is being performed, for example, the first heating control function is not selected; The second heating control function operates to perform heating control at a second predetermined temperature, and for example, heating is stopped or the heating power is weakened.

[Effects of the Invention] In the present invention, since the heating control function corresponding to each cooking is automatically selected according to the temperature rise of the to-be-cooked item over time,
No selection operation by the user is required. As a result, the first predetermined temperature is, for example, 130°C to prevent non-sticking.
If you set, for example, 230℃ as the second predetermined temperature to prevent oil cooking from igniting, you can avoid burning due to incorrect selection operations, unnecessary heating stops, or heating power. No suppression occurs.

[Example code] Next, the present invention will be explained based on examples.

FIG. 2 shows a gas stove 1 equipped with the stove control device of the present invention. Two gas stoves 2.3 are provided on the north side of the gas staple 1, and two gas stoves 2.3 are provided on the front side of the gas staple 1. , a grill inner box is provided inside the gas staple 1, and a grill door 4A for taking cooking food in and out of the knife 4;
On/off button 5.6.7 for operating each gas stove 2.3 and grill 4, respectively, and each gas stove 2.3
Also provided is an operation panel 20 for setting the operating state of the grill 4.

Each gas stove 2.3 performs normal heating operation, and
It has an overheat prevention function that stops combustion when the temperature of the food to be cooked rises above a predetermined temperature, and for this purpose, the stove burners 2a and 3a of each gas stove 2.3 have a
Temperature sensors 2b and 3b each having a built-in thermistor for detecting the temperature of a cooking container such as a pot are provided, and a control circuit 30 (described later) is provided based on the detected temperature of the temperature sensors 2b and 3b.
Safety control is performed and safety is ensured.

Each temperature sensor 2b, 3b is equipped with an elevating device (not shown), which moves up in response to the ignition operation and descends in response to the extinguishing operation. The gas staple 1 is pushed toward one side of the gas staple 1 and is supported by the gas stapler 1, so that when it rises, the detection part comes into elastic contact with the cooking container or the like and comes into close contact with it.

As shown in Fig. 3, the grill burner 4a, which consists of two burners arranged above and below each stove burner 2a, 3a and the rear of the grill door 4A with respect to the food to be cooked, is provided with a spark discharge for ignition. Ignition electrodes 12, 13, 14 and thermocouples 12a, 1 that sense combustion heat and generate electromotive force
3a and 14a, respectively.

A gas pipe 10 that supplies fuel gas to each burner 2a, 3a, and 4a has a valve m ellipse 2 consisting of a main valve that supplies and shuts off the fuel gas and a fuel control valve that adjusts the gas amount.
2, 23, and 24 are provided respectively, and each point extinguishing button 5
．． In addition to reversibly supplying and stopping the fuel gas in response to the operation in 6.7, the fuel gas is supplied in response to the operation of the gas amount adjustment levers 5a, 6a, and 7a provided on the front of the gas staple 1. Adjust the amount.

In addition, each gas pipe has electromagnetic safety valves 22a, 23a, 24.
a, thermocouples 12a, 13a, 14
The open state is maintained only when a current of a certain value or more is being supplied by the output of a, and when the current is small due to misfire, ignition error, etc., the closed state is established and the gas supply is stopped.

In addition, the electromagnetic safety valves 22a and 23a in the stove 2.3
In this case, only at the initial stage of ignition, the current for the forced interval is applied as an initial current regardless of the outputs of the thermocouples 12a and 13a.

In the gas staple 1 having the above configuration, each burner is controlled by a control circuit 30 provided within the gas staple 1.

The control circuit 30 is formed around a microcomputer, and as shown in FIG.
．． 3 and grill 4, the stove control section 31.32
and each functional section of the grill control section 33.

Since each of the stove control sections 31 and 32 performs similar control, only the stove control section 31 that controls the gas stove 2 will be described here.

When the ignition switch (not shown) linked to the ignition/extinguishing button 5 closes its contact, the stove control unit 31 causes the ignition electrode 12 to discharge a spark and starts combustion in the stove burner 2a.

Also, while the stove burner 2a is burning, the thermocouple 1
The coil of the electromagnetic safety valve 22a is energized by the output from the electromagnetic safety valve 22a to attract the valve body and maintain it in the open state. When the stove burner 2a misfires due to overboiled food or the like and the output of the thermocouple 12a decreases, the electromagnetic safety valve 22a is closed as a misfire detection state and the supply of fuel gas is stopped.

Further, during combustion, overheat prevention control is also performed to monitor the temperature of the food to be cooked based on the temperature detected by the temperature sensor 2b of the cooking container such as a pot to prevent overheating.

This control to prevent overheating, ζ, stops the fuel supply when the temperature of the food detected by the temperature sensor 2b reaches approximately 130°C or higher, in order to prevent simmering, etc. from burning. A low-cut control section 31a that performs a low-cut operation, a high-cut control section 31b that performs a high-cut operation that further increases the temperature limit to about 250°C so that you can cook tempura, etc., and a detected temperature T detected by a temperature sensor 2b. Each functional section of an automatic selection section 31c is provided that automatically selects a low-cut operation and a high-cut operation based on the following.

The automatic selection unit 31c selects the temperature T detected by the temperature sensor 2b.
The temperature rise with respect to time is calculated as IkiG, and the slope G
As shown in FIG. 1, a low-cut operation and a high-cut operation are automatically selected according to the following.

After the heating starts, the detected temperature 1 is extracted every predetermined time, for example every 60 seconds, and is used as the extraction temperature, and the temperature difference ΔT between them is calculated and the slope G of the detected temperature T with respect to time is calculated.
is calculated, and if the slope G is larger than the predetermined value In order to do so, both the low-cut operation and the high-cut operation are canceled and a timer cut operation, which will be described later, is performed (step 10).

Here, while considering safety, a timer cut operation was performed to ensure that heating continues for a certain period of time even if there is a certain degree of overheating, but this timer cut operation is not necessarily necessary. For example, if YF, S is selected in step 1 and neither low-cut nor high-cut operations are selected, a buzzer or chime may be used to notify that the cut operation is not being performed, or gas staple 1 may be activated. The cutting operation may be canceled only when the presence of a user nearby is detected by a detection means such as an infrared sensor.

On the other hand, if the slope G is smaller than the predetermined value It is determined whether the temperature T has reached a predetermined temperature Ta (for example, 95° C.) or higher.

If the detected temperature T does not reach the predetermined temperature Ta (No in step 2), the process moves to step 1 and waits until the detected temperature T reaches the predetermined temperature Ta.

When the detected temperature T becomes equal to or higher than the predetermined temperature Ta (YES in step 2), in order to automatically select between the low-cut operation and the high-cut operation, it is determined whether the slope G is larger than the predetermined value y for automatic selection. Determine.

When cooking with water or the like, the temperature of the wL food is brought to an equilibrium state due to boiling of the water, and the slope G of the temperature T detected by the temperature sensor 2b becomes smaller than the predetermined value y.

Therefore, if the slope G is smaller than the predetermined value y and indicates an equilibrium state due to water boiling (NO in step 3),
A low cut operation is automatically selected (step 20).

Conversely, if the slope G continues to be equal to or higher than the predetermined value y and does not indicate an equilibrium state due to water boiling (YES in step 3), the detected temperature T is 130° for stopping heating in low-cut operation. Until reaching C (step 4
(NO), move to step 3 and repeat the slope G
It is determined whether the slope G becomes smaller than the predetermined value y, and if the slope G does not become smaller than the predetermined value y until it reaches 130°C, which is the limit temperature for low-cut operation, then YES in step 4) , a high-cut operation is automatically selected (step 30).

In response to this automatic selection of cut operation, the on/off button 5
Green LED 22b and red LED 2 provided close to
2c indicates that the operation is a low-cut operation or a high-cut operation, respectively.

Next, the timer cut operation in step 10 above will be explained based on FIG. 5.

The timer cut operation is a control operation to ensure safety when neither low-cut nor high-cut operations are performed due to dry baking or stir-frying. Continue normal heating until the temperature reaches 250°C (No in step 11), and if the temperature reaches 250°C or higher (YES in step 11), measure the time that the temperature continues to be 250°C or higher. 250 by the end of the specified time
°C or below (YES in step 12)
＞, stop energizing the electromagnetic safety valve 22a and close it,
Stop the supply of fuel gas and stop heating (Step 1)
3).

Further, if the temperature T reaches 250° C. or more once and becomes lower than 250° C. by the time a predetermined time elapses, the detected temperature T is repeatedly monitored in step 11.

The low-cut control section 31a controls the temperature sensor 2b when the low-cut operation is selected by the automatic selection section 31c as shown in FIG. 6 in step 20 above.
When the detected temperature T becomes 130° C. or higher (YES in step 21), the electromagnetic safety valve 22a is de-energized and closed, and the supply of fuel gas is stopped to stop heating (step 22).

As shown in FIG. 7, the high-cut control unit 31b controls the temperature T detected by the temperature sensor 2b to 250°C when the automatic selection unit 31c selects the high-cut operation.
(YES in step 31), the electromagnetic safety valve 22a/\ is de-energized and closed, and the supply of fuel gas is stopped to stop heating (step 32).

In addition, regarding gas stove 3, it is greenish, E D 2
3b and a red LED 23c are similarly provided.

Furthermore, in order to further improve usability, the operation panel 20 is equipped with release switches 25 and 26 that prevent each cutting operation from being performed in order to perform heating regardless of the temperature T detected by the temperature sensors 2b and 3b. When the low-cut operation or high-cut operation is no longer performed by these switches, the timer power/soto operation described above is performed, and when a predetermined time t has elapsed since the temperature of 250°C or higher is detected, the heating is automatically turned off. is stopped.

In addition, when each burner 2a, 3a is extinguished by each cut operation, only the electromagnetic safety valves 22a, 23a are closed. The user is informed of this and is encouraged to close the valve using the ignition/extinguishing button 5.6.

In addition, while the low-cut operation or high-cut operation is canceled, the green, ED22b and red L E D
22 c both go out.

The lock lever 9 provided on the front of the gas staple 1 is
In order to prevent young people from inadvertently operating the ignition, the extinguishing buttons 5, 6, and 7 are locked so that they cannot be pressed.

In the gas stove 2 of the gas stove 1 of this embodiment having the above configuration, when dry-frying or frying, the detected temperature T rises by 1 as shown by the solid line A in FIG. 8 as soon as heating starts. , the slope G before reaching the predetermined temperature Ta'C is
When the value exceeds the predetermined value X, a timer cut operation is performed.

In addition, in the case of water dishes, as shown by the solid line B, the slope G at the heating start 'fJI period is smaller than the predetermined value X, and further,
Since it is detected that the slope G after the temperature reaches the predetermined temperature Ta° C. is smaller than the predetermined value y, the low-cut operation is automatically selected.

In addition, in the case of cooking with oil, as shown by the solid line C, the slope G at the initial stage of heating is smaller than the predetermined value X, and the predetermined temperature Ta''
Since it is not detected that the slope G is smaller than the predetermined value y even after the slope G exceeds C, the slope G is set at 130° for low-cut operation.
C is exceeded and high-cut operation is automatically selected.

As described above, in the present invention, low-cut operation and high-cut operation are automatically selected depending on the temperature detected by the temperature sensor, so there is no risk of burning when cooking with water, and there is no risk of ignition when cooking with oil. .

Furthermore, since each cutting operation is automatically selected, there is no possibility of malfunctions in cooking due to incorrect selection operations.

In this example, the slope G of the temperature of the food to be cooked was calculated based on the temperature difference ΔT for 60 seconds, but this predetermined time can be set arbitrarily depending on the heating capacity of the burner. You can set it to 30 to 120 seconds.

It should be noted that whether 95°C is set as the temperature at which to start determining whether the slope G of the detected temperature T is greater than or equal to the predetermined value y, or 95°C
Any temperature can be set in the range of 90 to 110°C.

In the above example, the low-cut operation is automatically selected based on detecting the equilibrium state due to boiling of water using the slope G. However, based on the difference in specific heat between water and oil, When the slope G of the detected temperature T is larger than a predetermined value, it is determined to be an oil dish, and when it is smaller, it is determined to be a water dish, and the selection may be made automatically.

In this case, since the slope differs depending on the amount of food to be cooked, the standard slope may be determined in advance through practical tests, and it may be made to correspond to the amount of food to be cooked using a separately provided setting means for the amount of food to be cooked, or a weight sensor may be incorporated. It would be better to set it up and make it correspond to the weight.

In addition, in this embodiment, the heating control is such that the heating is stopped when each predetermined temperature is reached, or the heating power is adjusted to maintain a constant temperature as in stew-like stews and tempura dishes. It may be possible to weaken the temperature or control the temperature to a constant temperature.

In the above embodiments, a gas stove was used, but an electric stove may also be used.

[Brief explanation of the drawing]

Fig. 1 is a flowchart for explaining automatic selection control by the stove control unit in the gas staple of this embodiment, Fig. 2 is a perspective view showing the gas staple of this embodiment, and Fig. 3 is a gas staple of this embodiment. A gas circuit diagram showing the gas circuit in the table;
Figure 4 is a functional block diagram for explaining the control circuit, Figure 5 is a flowchart for explaining timer cut operation, and Figure 6 is a flowchart for explaining the timer cut operation.
7 is a flowchart for explaining the low-cut operation, FIG. 7 is a flowchart for explaining the high-cut operation, and FIG. 8 is a time chart for explaining the operation of the stove control section. In the figure, 2a, 3a... Stove burner (heating means), 2
b, 3b...Temperature sensor, 31.32...Stove control unit (stove control device>, 31a...Low cut control unit (first heating control function), 31b・High cut control unit (second heating control function), 31c... automatic selection section (inclination calculation means).

Claims (1)

[Scope of Claims] 1) A first heating control function that includes a temperature sensor that detects the temperature of the food heated by the heating means and controls the heating means at a first predetermined temperature; A stove control device having a second heating control function of controlling the heating means at a second predetermined temperature higher than a predetermined temperature, further comprising a slope calculation means for calculating a temperature increase over time of the temperature detected by the temperature sensor. A stove control device, characterized in that the first heating control function and the second heating control function are automatically selected based on the slope calculated by the slope calculation means. 2) The stove control device according to claim 1, wherein the first heating control function is automatically selected when the slope is smaller than a predetermined value.