JP3053706B2 - Temperature control device of cooking device - 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 stove such as a table stove, and more particularly to a cooking stove for controlling the heating temperature of an object to be cooked by such a cooking stove within a predetermined temperature range. The present invention relates to a temperature control device.

[0002]

2. Description of the Related Art Conventionally, in this type of heating cooker such as a table stove, a thermistor is provided at a central portion of a burner head provided on a burner main body, and the thermistor is provided on a bottom of a cooking pot placed on the burner main body. There is already known a method in which the heating power of a burner is set to a predetermined temperature range by detecting the temperature so as to reduce the heat of the burner to a low heat or a high heat, and to keep a heating temperature of an object to be put into a cooking pot in a predetermined temperature range.

[0003] In such a heating cooker equipped with a thermistor, the heating temperature of the object to be cooked is controlled by setting an upper limit value and a lower limit value of a set temperature range for heating the cooking pot as shown in FIG. When the heating temperature rises and reaches the upper limit, the burner's heating power is automatically switched from high to low, and when the heating temperature of the cooking pot falls and reaches the lower limit, it automatically switches from low to high. It was done by.

[0004]

However, when the heating temperature of the cooking pot reaches the upper limit of the set temperature range and the temperature rises sharply even if the burner is set to low heat, the upper limit is greatly increased. In some cases, the object to be cooked in the cooking pot may be overheated (overshoot).

FIG. 6 shows two examples of the heating temperature curve. In the case of the heating temperature curve (a) in which the cooking pot is rapidly heated and the temperature rises sharply, the heating temperature curve with a gentle heating speed is shown. It can be seen that the degree of the overshoot becomes larger than in the case of (b).

[0006] Further, when the heating power of the burner is increased to a high value after the heating temperature of the cooking pot reaches the lower limit value of the set temperature range, the heating temperature curve (a) shown in FIG. Since the temperature drop rate of the cooking pot is higher than that of the temperature curve (b), the temperature rises only when the temperature falls significantly below the lower limit of the set temperature range. As described above, there is a problem that the temperature control greatly varies depending on the degree of change in the temperature rise or the temperature drop.

In controlling the heating temperature of an object to be cooked put into the cooking pot by measuring the pot bottom temperature of the cooking pot, the pot bottom temperature detected by the thermistor of the cooking pot and the temperature in the cooking pot are controlled. Because the temperature does not always match the actual temperature of the food, the phenomenon that the food overshoots or cools too much due to the delay in switching the heat of the burner from high to low or from low to high is delayed. As a result, the variation in the heating temperature was large, and it could not be said that the temperature control was always good.

[0008] On the other hand, there is known an apparatus in which the opening degree (gas amount) of a gas proportional control valve is proportionally controlled in accordance with a difference between a target set temperature within an allowable set temperature range and a sensor temperature detected from the bottom of the pan. However, the gas proportional control valve is more expensive than the normal on / off control valve, and the operation program by the microcomputer from the input temperature data is complicated, and the cost is too high, such as an increase in the memory capacity. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to respond to a heating temperature gradient that tends to increase a cooking object or a temperature gradient that tends to decrease a cooking object. Accordingly, it is an object of the present invention to provide a temperature control device for a cooking device capable of switching the heating power of a burner from high to low or from low to high to more accurately control the heating temperature of an object to be cooked. Another object of the present invention is to provide such a heating cooker at low cost.

[0010]

According to a first aspect of the present invention, there is provided a temperature control apparatus for a cooking device, comprising: a heating means for heating an object to be cooked; A temperature detecting means for detecting a heating temperature of the object to be heated; and a heating temperature of the object to be heated detected by the temperature detecting means, which is in a rising tendency, is predetermined from a target set temperature within an allowable set temperature range. First set temperature reaching determination means for determining whether a first set temperature higher by the temperature has been reached, and determining that the heating temperature of the article to be cooked has reached the first set temperature by the first set temperature reaching determination means. A temperature gradient calculating means for calculating a heating temperature gradient which tends to increase the object to be cooked, and after a predetermined time determined according to a temperature gradient calculated value obtained by the temperature gradient calculating means. It is intended to be subject matter of which is provided with a thermal control means for switching the heating power of the serial heating means from the high heat to low heat.

According to a second aspect of the present invention, there is provided the temperature control apparatus according to the first aspect, further comprising an allowable setting of a heating temperature of the article to be cooked which is detected by the temperature detecting means and has a downward tendency. A second set temperature arriving means for judging whether or not the temperature has reached a second set temperature lower by a predetermined temperature than the target set temperature within the temperature range; and heating of the object by the second set temperature arriving judgment means. Temperature gradient calculating means for calculating, by calculation, a heating temperature gradient that tends to lower the object to be cooked when it is determined that the temperature has reached the second set temperature, wherein the thermal power control means obtains the temperature gradient calculating means. The gist of the present invention is to have a control function of switching the heating power of the heating means from low to high after a predetermined temperature determined according to the calculated temperature gradient value.

According to a third aspect of the present invention, there is provided a temperature control apparatus for a cooking device, comprising: a heating unit for heating the object to be cooked; and a temperature for detecting a heating temperature of the object to be heated by the heating unit. Detecting means for determining whether or not the heating temperature of the object to be cooked detected by the temperature detecting means, which is increasing, has reached a first set temperature higher than a target set temperature by a predetermined temperature within an allowable set temperature range; The first to determine
When the set temperature reaching determination means and the first set temperature reaching determination means determine that the heating temperature of the object has reached the first set temperature, a heating temperature gradient that tends to increase the object to be cooked is calculated. The temperature gradient calculating means to be determined; and the heating means at a point in time when the object reaches a predetermined heating power change temperature higher than the first set temperature determined according to the temperature gradient calculated value obtained by the temperature gradient calculating means. And a heating power control means for switching the heating power from high heat to low heat.

According to a fourth aspect of the present invention, there is provided a temperature control apparatus according to the third aspect, wherein the heating temperature which is detected by the temperature detecting means and has a downward tendency is detected. A second set temperature arriving means for judging whether or not a second set temperature which is lower than the target set temperature by a predetermined temperature is reached within the set temperature range; and Temperature gradient calculating means for calculating, by calculation, a heating temperature gradient that tends to lower the object to be cooked when it is determined that the heating temperature has reached the second set temperature, and wherein the thermal power control means is provided by the temperature gradient calculating means. When the cooking object reaches a predetermined heating power change temperature lower than the second set temperature determined according to the calculated temperature gradient calculated value, the heating power of the heating means is switched from low to high. That combines the control function is intended to be subject matter.

[0014]

According to the temperature control device for a cooking device according to the first aspect of the present invention, the heating temperature of the object to be heated by the heating means is detected by the temperature detecting means. When the heating temperature of the object to be cooked is increasing, the heating temperature of the object to be cooked is higher than a target set temperature within an allowable set temperature range by a detection signal from the temperature detecting means.
Whether or not the set temperature has been reached is determined by the first set temperature reaching determination means. Then, when the first set temperature reaching determination means determines that the heating temperature of the object has reached the first set temperature, a heating temperature gradient in which the object to be cooked tends to rise is calculated by the temperature gradient calculating means. Since the timer time is determined according to the temperature gradient calculation value obtained by the temperature gradient calculation means, the heat power of the heating means is switched from high to low by a command from the heat control means after the lapse of the time.

Here, the "timer setting time" is, for example, when the heating temperature of the object reaches the first set temperature, and when the temperature rise gradient is large, it is the same as or shortly at the time when the first set temperature is reached. When the rising temperature gradient is small, a longer time is set. The timer setting time is determined in two or three or more stages depending on the temperature rise gradient. When the rising temperature gradient is large, the flame is switched to low heat early, and when the rising temperature gradient is small, the timing is delayed and the flame is switched to low flame after a while, so that the heating is switched between when the rising temperature gradient is large and when it is small. The temperature at which the heating temperature of the food changes from rising to falling is substantially constant, and the upper limit of the heating temperature adjustment is substantially constant without variation. It goes without saying that the more the timer setting time is determined in multiple stages, the more accurately the heating temperature is controlled.

According to the temperature control apparatus of the second aspect of the present invention, not only is the upper limit of the heating temperature tending to rise in the object to be cooked controlled, but also the heating power of the heating means is changed from high to low. By switching, the lower limit value in the case where the heating temperature of the object to be cooked is changed from rising to falling and gradually lowered is also controlled. That is, it is determined whether the heating temperature of the food has reached the second set temperature lower than the target set temperature by the detection signal from the temperature detecting means when the heated temperature of the food is decreasing. When the heating temperature of the object to be cooked reaches the second set temperature, the heating temperature gradient of the object to be cooked is determined by the second set temperature arrival determining means. It is obtained by the calculation by the gradient calculating means. Since the timer time is also determined according to the temperature gradient calculation value obtained by the temperature gradient calculation means, after the lapse of the time, the heating power of the heating means is switched from low to high by a command from the heating power control means.

In this case, the timer setting time is also the same as the time when the heating temperature of the object to be cooked drops to the second set temperature due to the temperature drop and the temperature drops to the second set temperature. Alternatively, it is set so that the switching from the low heat to the high heat can be performed in a short time, and when the falling temperature gradient is small, the timer operation time is lengthened to delay the timing of switching the heating power from the low heat to the high heat. Then, the temperature at which the heating temperature of the object to be cooked changes from falling to rising becomes substantially constant, and the lower limit value of the temperature adjustment is controlled to be constant.

Further, according to the temperature control device of the cooking device according to the third aspect of the present invention, the heating temperature of the object to be heated by the heating means is detected by the temperature detecting means, and the temperature of the object to be cooked is detected. Whether the heating temperature of the object has reached the first set temperature higher than the target set temperature within the allowable set temperature range of the object to be cooked according to the detection signal from the temperature detecting means when the heating temperature is increasing. Is determined by the first set temperature reaching determination means, and when the first set temperature reaching determination means determines that the heating temperature of the article has reached the first set temperature, the heating of the article to be cooked tends to increase. Although the temperature gradient is obtained by the calculation by the temperature gradient calculating means, the temperature at which the heating power is switched from high to low is determined according to the calculated value of the temperature gradient calculated by the temperature gradient calculating means. Thermal of the heating means when the foods reaches the switching temperature is changed to low heat from high heat by thermal control means.

Here, the "thermal power switching temperature" is, for example, a temperature which is the same as or slightly higher than the first set temperature when the temperature rise in heating of the object to be cooked reaches the first set temperature is large. When the rising temperature gradient is small, a higher temperature is set. By doing so, when the rising temperature gradient is large, the temperature is switched to low heat at a lower temperature, and as the rising temperature gradient becomes small, the timing is switched to low heat with a delay in timing. The temperature at which the heating temperature changes from rising to falling becomes substantially constant, and the upper limit of the temperature adjustment is controlled to be constant. In this case as well, the heating power switching temperature is determined in two or three or more stages by a rising temperature gradient.

According to the temperature control apparatus of the fourth aspect of the present invention, in the above-described temperature control apparatus of the third aspect of the present invention, the heating power of the heating means is switched from high to low and the heat is reduced. The present invention is also applied to the control of the lower limit value in the case where the heating temperature of the cooked food changes from rising to falling and gradually lowered. That is, when the heating temperature of the object to be cooked is decreasing, the heating temperature of the object to be cooked is lower than the above-described target set temperature by the detection signal from the temperature detecting means.
Whether the set temperature has been reached or not is determined by the second set temperature reaching determination means, and when the heating temperature of the object to be cooked is determined to have reached the second set temperature by the second set temperature reaching determination means, the cooking target is determined. The heating temperature gradient that tends to lower the object is calculated by the temperature gradient calculating means, and the temperature at which the heating power is switched from low to high is also determined according to the temperature gradient calculated by the temperature gradient calculating means. When the food reaches the switching temperature, the heating power of the heating means is switched from low to high in accordance with a command from the heating power control means.

In this case, the "heating power switching temperature" is also about the same as or slightly lower than the second set temperature when the temperature of heating the object to be cooked drops to the second set temperature due to the temperature drop and the falling temperature gradient is large. , And is set to a lower temperature when the falling temperature gradient is small. By doing so, the temperature at which the heating temperature of the object to be cooked changes from falling to rising becomes substantially constant, and the lower limit value of the temperature adjustment is controlled to be constant.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a table stove as a heating cooker according to one embodiment of the present invention, and shows a schematic configuration diagram of a temperature control device thereof.

As shown in FIG.
0, a large number of flame ports 16 are provided in the peripheral portion of the burner head 14 of the burner main body 12, and a gas pipe 18 is connected to the base end of these flame ports 16, 16 #.
Is provided with a main solenoid valve 20 and a main solenoid valve 22 for opening and closing the gas line. In addition, a bypass pipe 24 is provided in the gas pipe 18 in parallel with the main solenoid valve 20, and an orifice 26 is provided in the bypass pipe 24.

At the center of the burner head 14 of the burner main body 12, when the cooking pot N is placed on the stove 10, the contact type temperature sensor 28 is in contact with the bottom of the pot to detect the temperature of the pot bottom. Are urged upward by a spring (not shown).

The table stove 10 is provided with a controller 30 for controlling the combustion. The controller 30 has a central processing unit (CPU) 32, a ROM 34 and a RAM 36 connected to each other via a data bus 38. The temperature sensor 28 is connected in a signal manner through an input interface 40, and is further connected in a signal manner via an output interface 42 to the main solenoid valve 20 and the main solenoid valve 22. Then, the temperature sensor 28 periodically (for example, every 0.1 second) sends a detection signal of the pan bottom temperature to the input interface 4.
0 to the controller 30 via the CPU 3
2 has a calculating function of sequentially judging the temperature of the pot bottom based on the detection signal from the temperature sensor 28 and calculating a time-series change in the temperature gradient by calculation, and based on the calculation result, the main electromagnetic A signal for instructing opening and closing of the valve 20 and the original solenoid valve 22 is output. The ROM 34 stores an execution program for controlling the combustion of the stove 10, and the RAM 36 stores the transmission data from the temperature sensor 28 and the calculation result of the temperature gradient by the CPU 32. It is.

According to the table stove 10 constructed as described above, the gas burner is ignited by turning the ignition knob (not shown) to the ignition position, and the gas flame is emitted from all the flame ports 16, 16 ° of the burner head 14. By being spouted, the cooking pot N placed on the table stove 10 is heated from the pot bottom. At this time, a temperature sensor 28 projecting from the central portion of the burner head 14 by the urging force of a spring (not shown) is pressed against the bottom of the cooking pot N, and a detection signal of the temperature of the bottom of the pot is detected by the temperature sensor 28. The controller 3 periodically (for example, every 0.1 seconds)
0. Then, in the controller 30, the temperature data of the pan bottom temperature based on the detection signal from the temperature sensor 28 is stored in the RAM 36, and each time the detection signal from the temperature sensor 28 is input, the CPU 32 tends to increase the pan bottom temperature. Or a temperature gradient that tends to decrease is calculated by calculation, and the calculated data is also stored in RAM.
36.

Thus, the cooking pot N on the stove 10
Is heated by the gas burner, and the cooking object in the boiling water stored in the cooking pot N is gradually heated. At this time, the heating temperature of the cooking object in the cooking pot N is set to a predetermined allowable temperature range ( For example, when the temperature is controlled to be 175 ° C. to 185 ° C.), in the present invention, the target temperature is set in advance within the allowable temperature range (in this example, 180 ° C. shown in FIG. 3). A first set temperature (in this example, 182 ° C.) that is higher than the target temperature is set, and a second set temperature (in this example, 178 ° C.) lower than the target set temperature by a predetermined temperature. )).

Then, in the first embodiment of the present invention, the heating temperature of the cooking pot is controlled according to the flowchart shown in FIG. That is, in the flowchart shown in FIG. 2, after the gas burner is first ignited (Step 1, hereinafter simply referred to as “S1”), the cooking pot is periodically transmitted from the temperature sensor 28 based on the temperature signal. It is constantly determined whether or not the temperature at the bottom of the N pot has exceeded the first set temperature (S2). When it is determined that the temperature has exceeded the first set temperature, C is determined.
The PU 32 calculates a rising temperature gradient from the temperature data based on the last temperature signal and the temperature signal immediately before the temperature signal or several temperature signals traced back (S3).
Based on the calculated value of the rising temperature gradient, a timer set time for switching the heating power of the gas burner from high to low is determined (S4). This timer setting time is t1 seconds (including 0 seconds) when the temperature gradient ≧ K1 due to the rising temperature gradient,
When K1> temperature gradient ≧ K2, t2 seconds, K2> temperature gradient ≧ K
In the case of 3, it is determined over a plurality of stages such as t3 seconds (t3>t2> t1).

As soon as the timer set time is determined based on the calculation result of the temperature gradient in S4, the timer is activated (S5). During the operation of the timer, the pan bottom temperature is reduced to the third set temperature (the upper limit temperature of the allowable set temperature range). ) Is determined (S6). Then, while the temperature does not exceed the third set temperature, it is determined whether or not the timer set time has expired (S7). If the timer set time has expired, a signal is sent from the controller 30 to the main solenoid valve 20, and the main solenoid valve is sent. 20
The gas flowing through the gas pipe 18 is blocked by the burner main body 12 through the bypass pipe 24 and the orifice 26.
Sent to Therefore, the flow rate of the gas sent to the burner main body 12 becomes small, and the heating power of the gas burner is switched from high to low.

If the temperature exceeds the third set temperature within the timer set time in S6, it is assumed that the temperature rise has rapidly occurred due to disturbances such as the input of hotter food (cook), and in this case, Immediately, the burner power is switched from high to low, thereby avoiding excessive overshoot.

FIG. 3 shows the temporal change of the pot bottom temperature accompanying the control of the gas burner's thermal power in this case. The horizontal axis indicates time (t), and the vertical axis indicates pan bottom temperature (T). On the vertical axis, X is a target set temperature (for example, 180 ° C.), X
+ B to X−b are within the allowable set temperature range (for example, 175 ° C.
185 ° C), X + a is the first set temperature (182 ° C), X-
“a” indicates the second set temperature (for example, 178 ° C.).
Further, a limit temperature at which the thermal power of the burner is forcibly stopped is shown at a location that greatly exceeds the upper limit value (185 ° C.) of the allowable set temperature range.

In FIG. 3, three types of heating temperature curves (a), (b), and (b) from the large temperature gradient to the small temperature gradient when the pot bottom temperature reaches the first set temperature (X + a) by the burner heating are obtained. C). As shown in the heating temperature curve (b), when the temperature rise at the first set temperature is the largest, the timer set temperature is the shortest at t1 seconds (including 0 seconds), and the heating temperature curve (b) If the temperature rise gradient at the time when the temperature reaches the first set temperature is medium as shown in ()), the time is set to the middle of the timer set time t2 seconds, and the temperature is changed to the first set temperature as shown in the heating temperature curve (c). When the temperature rise is the smallest, the timer set time is the longest at t3 seconds.

As a result, each heating temperature curve (a)
As can be seen by comparing (b) and (c), after the elapse of the timer set time, the time when the heat of the burner was switched from high to low heat (indicated by a cross in each heating temperature curve in the figure). The bottom temperature of the pan changes from rising to falling, but the highest temperature of each heating temperature curve (a), (b), and (c) is approximately equal, and the temperature rises and drops at a place slightly lower than the upper limit of the allowable setting range. The control for turning to is performed.

Next, after the pan bottom temperature changes from a rise in temperature to a fall, the pan bottom temperature falls because the burner heating power has continued to be low, but in the above-mentioned flowchart shown in FIG. (S9), it is constantly determined whether the temperature falls below the target set temperature and exceeds the second set temperature (S9). When it is determined that the temperature has exceeded the second set temperature, the CPU 32 uses the temperature data to determine a falling temperature gradient. (S10), and
A timer setting time for switching the heating power of the gas burner from low heat to high heat is determined based on the calculated value of the falling temperature gradient (S11). The timer setting time is determined in a plurality of steps, such as a short descending temperature gradient and a long descending temperature gradient, similarly to the above-described rising temperature gradient.

As soon as the timer set time is determined based on the result of the temperature gradient calculation in S10, the timer is activated (S12). During the operation of the timer, the pan bottom temperature is set to the fourth set temperature (lower limit temperature of the allowable temperature range). Is determined (S13), while the temperature does not exceed the fourth set temperature, it is determined whether the timer set time has expired (S1).
4) If the timer set time expires, the controller 3
The main solenoid valve 20 is re-opened by the command signal from 0, and the amount of gas flowing through the gas pipe 18 increases, so that the heating power of the gas burner is switched from low to high. When the temperature exceeds the fourth set temperature within the timer set time in S13, the burner power is immediately switched from low to high.
This prevents the object to be cooked from being too cold.

This will be described again with reference to the graph of the temporal change of the bottom temperature of the pot accompanying the control of the heat of the gas burner shown in FIG. 3 at the time when the temperature reaches the second set temperature as indicated by the heating temperature curve (a). The one with the largest falling temperature gradient at has the shortest timer setting time and the heating temperature curve (b)
In the case where the falling temperature gradient at the time when the temperature reaches the second set temperature is medium, the setting time of the timer is also medium, and the heating temperature curve (c) indicates the time when the temperature reaches the second set temperature. The one with the smallest falling temperature gradient makes the setting time of the timer the longest. As a result, the pan bottom temperature changes from falling to rising around the time when the burner power was switched from low heat to high heat after the timer setting time elapsed (indicated by a cross in each heating temperature curve in the figure). In the heating temperature curves (a), (b), and (c), a control is made to change from a temperature decrease to a temperature increase at a place slightly higher than the lower limit value of the allowable set temperature which is substantially equal. In FIG. 3, the solid line portion of each of the heating temperature curves (a), (b), and (c) indicates that the heating power is high, and the broken line indicates that the heating power is low.

FIG. 4 shows a flowchart of temperature control according to another embodiment of the present invention. FIG. 4 shows a flow chart of the burner power control after the pan bottom temperature has risen and has exceeded the first set temperature. As shown in the flow chart of FIG.
, The temperature at which the heating power of the gas burner is switched from high to low is determined according to the flowchart of FIG. (S20).

The switching temperature is determined by the heating temperature curve (a) in the graph of the temporal change of the pan bottom temperature shown in FIG.
The temperature at the end of the timer setting time indicated by the crosses (b) and (c) may be the same as the temperature. Then, the temperature control of the same temperature curve as the heating temperature curves (a), (b), and (c) should be set.

In the controller 30, the temperature sensor 2
It is determined from the detection signal of the bottom temperature of the pot 8 whether or not the thermal power switching temperature has been reached (S21), and when the thermal power switching temperature is reached, the thermal power of the burner is switched from high to low (S8). In this way, the maximum heating temperature of the bottom of the pot changes from rising to falling at substantially the same temperature regardless of the rising temperature gradient.

On the other hand, FIG. 5 shows a flowchart of the burner power control after the pan bottom temperature has been falling and has exceeded the second set temperature. In this case as well, when the descending temperature gradient is calculated by calculation in S10 shown in the flowchart in FIG. 2 described above, the temperature at which the heating power of the gas burner is switched from low to high is determined according to the flowchart in FIG. 5 (S30).

The switching temperature is also determined at the end of the timer setting time indicated by the crosses of the heating temperature curves (a), (b), and (c) in the graph of the temporal change of the pan bottom temperature shown in FIG. Temperature may be the same as that way,
Temperature control of the same temperature curve as the heating temperature curves (a), (b), and (c) is achieved.

In the controller 30, the temperature sensor 2
It is determined from the detection signal of the pan bottom temperature according to 8 whether or not the heating power switching temperature has been reached (S31), and when the heating power switching temperature is reached, the heating power of the burner is switched from high to low (S15). In this way, the lower limit heating temperature of the bottom of the pot changes from falling to rising at substantially the same temperature regardless of the falling temperature gradient.

Although not particularly shown in the flow chart in this embodiment, the temperature of the pot bottom exceeds the third set temperature in S8 of the flow chart shown in FIG. 2, and the burner power rises in spite of switching from the high heat to the low heat. When the temperature reaches the fifth set temperature, a limit switch (not shown) operates to completely stop the combustion of the burner.

The present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, an example of a gas table stove is shown. However, it is needless to say that the present invention can be applied to various heating cookers such as a fryer and a boiled noodle cooker. In short, the present invention resides in that the heating power is set to low or high in a timely manner according to the temperature gradient of the heating temperature of the object to be cooked.

[0045]

As is apparent from the above description, according to the temperature control device for a cooking device according to the present invention, when the heating temperature of the object is controlled within a predetermined allowable temperature range, the temperature is controlled. Since the intensity of the heating power is switched and controlled in a timely manner in accordance with the rising gradient or the temperature falling gradient, there is no control variation such as overshoot or excessive cooling. Therefore, it is extremely effective to apply the present invention to various types of heating cookers without any trouble that would impair the taste of the object to be cooked and without wasteful consumption of heat. Further, since the heating temperature and the temperature gradient at that time are obtained by the detection signal from the temperature sensor, and the strength of the heating power is switched and controlled based on this, there is an advantage that it can be provided at low cost in terms of cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a temperature control device of a heating cooker as one embodiment of the present invention.

FIG. 2 is a flowchart of temperature control in the temperature control device shown in FIG.

FIG. 3 is a diagram illustrating a change over time of a pot bottom temperature when the heating temperature of the object to be cooked is controlled according to the flowchart shown in FIG. 2;

FIG. 4 is a flowchart of temperature control as another embodiment of the present invention (when the burner power is switched from high to low)
It is.

FIG. 5 is a flowchart of temperature control as another embodiment of the present invention (when the burner power is switched from low to high).

FIG. 6 is a flowchart of temperature control in a conventional temperature control device for this type of cooking device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Table stove 12 Burner main body 16 Flame opening 18 Gas pipe 20 Main solenoid valve 28 Temperature sensor 30 Controller N Cooking pot

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24C 3/12 F24C 7/04 301 H05B 6/12

Claims (4)

(57) [Claims] 1. A heating means for heating an object to be cooked, a temperature detecting means for detecting a heating temperature of the object to be heated by the heating means, and a tendency of the object to be cooked detected by the temperature detecting means Means for determining whether the heating temperature has reached a first set temperature higher than a target set temperature by a predetermined temperature within an allowable set temperature range; and A temperature gradient calculating means for calculating a heating temperature gradient in which the cooking object has a rising tendency when the heating temperature of the cooking object has reached the first set temperature by the determining means; Heating power control means for switching the heat power of the heating means from high heat to low heat after a lapse of a predetermined time determined according to the calculated temperature gradient calculated value. Control device. 2. Whether or not the heating temperature of the object to be cooked, which is detected by the temperature detecting means, is decreasing to a second set temperature lower than a target set temperature by a predetermined temperature within an allowable set temperature range. A second set temperature reaching means for judging whether or not the heating of the object has a downward tendency when the second set temperature reaching judging means judges that the heating temperature of the object has reached the second set temperature; Temperature gradient calculating means for calculating a temperature gradient, wherein the heating power control means reduces the heating power of the heating means from low heat after a predetermined temperature determined according to the temperature gradient calculation value obtained by the temperature gradient calculating means. The temperature control device for a heating cooker according to claim 1, further comprising a control function of switching to high heat. 3. A heating means for heating the object to be cooked, a temperature detecting means for detecting a heating temperature of the object to be heated by the heating means, and a rising tendency of the object to be detected detected by the temperature detecting means. Means for determining whether the heating temperature has reached a first set temperature higher than a target set temperature by a predetermined temperature within an allowable set temperature range; and A temperature gradient calculating means for calculating a heating temperature gradient in which the cooking object has a rising tendency when the heating temperature of the cooking object has reached the first set temperature by the determining means; The heating power for switching the heating power of the heating means from high to low when the food reaches a predetermined heating power change temperature higher than the first set temperature determined according to the calculated temperature gradient calculated value. A temperature control device for a cooking device, comprising: a control unit. 4. A determination as to whether or not the heating temperature of the object to be cooked, which is detected by the temperature detecting means, is falling to a second set temperature lower than a target set temperature by a predetermined temperature within an allowable set temperature range. A second set temperature reaching determining means for determining whether the heating temperature of the food has reached the second set temperature by the second set temperature reaching determining means; Temperature gradient calculating means for calculating a heating temperature gradient, wherein the thermal power control means changes a predetermined thermal power lower than the second set temperature determined according to the temperature gradient calculated value obtained by the temperature gradient calculating means. 4. The temperature control device for a heating cooker according to claim 3, further comprising a control function of switching the heating power of the heating means from low heat to high heat when the temperature of the object reaches the temperature.