JPH07106177B2 - Combustion control device for rice cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control device for a rice cooker, in which combustion control is performed in consideration of the heat capacity of a rice cooker, and the temperature in the cooker greatly rises above a target temperature. The so-called overshoot can be suppressed.

[0002]

2. Description of the Related Art As a rice cooker in which high-quality cooked rice can be cooked by devising a heating method, there is, for example, one shown in FIG. On the bottom wall and lid (11) of the hook (1), attach the hook (1)
Temperature sensors (31) (12) for detecting the internal temperature are provided separately, and the temperature sensor (12) on the lid (11) side is a cylinder shaft (14) to which the inner lid (15) is detachably attached. It is arranged inside so that the temperature inside the kettle (1) can be directly detected.

A gas valve (3) is inserted in the gas circuit (28) to the gas burner (2), and the gas valve (3) is controlled to be opened and closed by a heating control device (30). ing. And
At the time of heating control, the temperature comparator (32) (heating controller (32) is set to the temperature detected by the temperature sensor (12) on the lid (11) side and the set temperature of the temperature setter (33) in the heating controller (30). 30)) and adjust the temperature in the kettle (1) while burning and extinguishing the gas burner (2) based on the comparison result.

As shown in FIG. 7, the whole process of cooking rice includes a preliminary cooking process (A), a main cooking process (B), which are arranged in time series.
And the steaming process (C), the preliminary cooking process
(A) properly adjusts the water content of the rice grains, the main cooking step (B) actually cooks the cooked rice, and the steaming step (C) carries out the operation of eliminating the cooked rice. In this case, when performing the preliminary cooking step (A) where the temperature inside the kettle (1) is relatively low, there is a large temperature difference between the surface of the kettle bottom that is directly heated by the gas burner (2) and its internal temperature. Therefore, at the time of performing the preliminary cooking step (A), the heating control operation is advanced while detecting the actual temperature in the pot (1) by the temperature sensor (12) provided in the lid body (11). That is, when the temperature inside the kettle detected by the temperature sensor (12) reaches the target temperature (usually 30 ° C.), the gas burner (2) is kept in the extinguished state, and conversely, the temperature detected by the temperature sensor (12) is the above target temperature. When it becomes lower, the gas burner (2) is burned again. Then, the inside of the kettle (1) is maintained at the target temperature by the intermittent combustion of the gas burner (2).

However, in the above-mentioned conventional one, even if the gas burner (2) is extinguished when the temperature detected by the temperature sensor (12) reaches the target temperature, the temperature in the kettle (1) exceeds the target temperature. A so-called overshoot that causes a large temperature rise occurs,
There was a problem that the cooked rice was adversely affected. The above problems will be described in more detail.

For example, when the temperature burner (2) extinguishes when the temperature sensor (12) detects 30 ° C. as the target temperature,
The residual heat stored in the kettle (1) with a large heat capacity diffuses into the rice grains inside the kettle (1), and when it reaches a thermal equilibrium state, the temperature inside the kettle (1) becomes higher than the target temperature and overheats. Shoot occurs. In particular, when the amount of cooked rice is extremely small, the heat capacity of the kettle (1) has a large influence, and the above-mentioned overshoot becomes significant, which has a bad influence on the cooked rice.

In the above, the inside of the kettle (1) is kept at the set temperature while intermittently burning the gas burner (2), but when the inside of the kettle (1) reaches the set temperature, the gas burner (2) 2) may be reduced so that the temperature in the kettle (1) is maintained at the target temperature while changing the combustion amount of the gas burner (2). The present invention has been made in view of the above, "gas burner (2) and a temperature sensor for detecting the temperature in the pot (1) which is heated by, a temperature sensor sensing the temperature and temperature setter A temperature comparator (32) that compares the temperatures stored in (33) and outputs a combustion limit signal when the detected temperature of the former exceeds the set temperature of the latter is provided, and based on the output of the temperature comparator (32). Control the heat of the gas burner (2)
In rice cooker combustion control device "which is adapted Gosuru, as its object to make it may suppress overshoot of the temperature of the internal pot (1) at the time of heating control.

[0008]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is to " heat the temperature of the upper part of the cooked rice containing section in the kettle (1) ".
Temperature sensor (12) for detecting the temperature and the bottom of the pot (1)
A temperature sensor (31) for detecting the temperature is provided, and the kettle (1) is provided.
The temperature sensor (12) is checked until the inside becomes boiling.
Compare the known temperature with the temperature stored in the temperature setter (33).
When the combustion limit signal of the temperature comparator (32)
In addition to reducing the heating power of the burner (2),
Adds scent from the water evaporation process after reaching the boiling state
In the process, the temperature detected by the temperature sensor (31) and the temperature setter
When the cooked temperature stored in (33) matches
Gas burner by the combustion limit signal of the temperature comparator (32)
In order to extinguish (2), in each heating step
As the set temperature, a temperature lower by a predetermined temperature than the target temperature to be raised is stored in the temperature setter (33). "

[0009]

The above technical means operates as follows. When the kettle (1) is heated by the combustion of the gas burner (2), the temperature detected by the temperature sensor (12) (the temperature inside the kettle) rises, as in the conventional case. Boiling inside the pot (1) during the rice cooking process
When the temperature sensor (12) detects a temperature lower than the target temperature for raising the temperature in the kettle (1) by a predetermined temperature, the temperature setter (33) for storing the temperature and the temperature sensor The temperature comparator (32) for comparing the temperatures of (12) outputs a combustion limit signal, which reduces the heating power of the gas burner (2). Then, from that time, the residual heat stored in the wall of the kettle (1) diffuses into the rice grains and the like inside.

When the thermal diffusion is completed, the temperature inside the kettle (1) detected by the temperature sensor (12) due to the thermal diffusion is higher than before the thermal diffusion, and the temperature rise causes the internal temperature of the kettle (1) to increase. The temperature rises to the target temperature or its vicinity. After that, when the temperature of the kettle (1) is lowered by natural heat dissipation and the temperature detected by the temperature sensor (12) reaches the temperature stored in the temperature setter (33) (a temperature lower than the target temperature by a predetermined temperature), the gas burner (2). The combustion restriction state of 1 is released and the combustion is resumed in the normal state, and the temperature detected by the temperature sensor (12) rises. Take
Depending on the mode, temperature control until the inside of the kettle (1) becomes a boiling state
Your control will be executed. Subsequent water evaporation process and aromatizer
A temperature sensor that detects the temperature of the bottom of the kettle (1)
Cooking temperature stored in (31) detection temperature and temperature setting device (33)
Of the temperature comparator (32) when the rising temperature matches
Extinguish the gas burner (2) with the combustion restriction signal
Controlled by. In the scented state, water evaporates
Therefore, there is a temperature sensor (12) above the cooked rice container.
Temperature detection precision of the temperature sensor (31) rather than the detection accuracy of
The degree is high. Therefore, the water evaporation step and the scenting step
The heating control of is accurately performed.

[0011]

[Effect] The present invention has the following unique effects. Since the gas burner (2) is extinguished when the temperature in the kettle (1) rises to a temperature lower than the target temperature by a predetermined temperature, even if the internal temperature further rises due to the residual heat of the kettle (1) There is less concern that the temperature will be significantly exceeded. That is, the overshoot is suppressed, and the adverse effects on the taste of cooked rice are reduced. In addition, the heating until the inside of the kettle (1) reaches a boiling state
In the thermal process, the temperature inside the kettle (1) in this process is accurate
Is controlled based on a temperature sensor (12) that can detect
In the water evaporation process and the scenting process, the pot at this point
Temperature sensor (31) that can accurately detect the temperature inside (1)
Since it is controlled based on the detected temperature of
Be certain.

[0012]

Embodiments of the present invention described above will now be described in detail with reference to the drawings. The rice cooker of the embodiment of the present invention has a schematic structure as shown in FIG. 1, and the gas circuit (28) to the gas burner (2) has a first gas valve (22) and a second gas valve ( 23) and the proportional valve (24) are arranged in this order. The pilot burner is installed between the first gas valve (22) and the second gas valve (23).
The gas circuit to (26) is branched. The first and second gas valves (22), (23) and the proportional valve (24) are connected to the temperature sensors (12) (3).
The heating control device (30) for judging the detected temperature of 1) is controlled, and the operation signal of the rice cooking switch (10) is applied to the heating control device (30).

The rice cooker is controlled by a control program stored in a microcomputer in the heating controller (30), and the control program is as shown in the flow chart of FIG. Hereinafter, the entire heating process performed by the rice cooker of this embodiment will be described with reference to FIG. <About the preliminary cooking process (A)> (A). First, monitor the operation of the rice-cooking switch (10) after setting "0" in the rice-cooking amount memory Z, which is necessary for determining the amount of rice-cooked rice, which will be described later (see the steps of the reference numerals (59) (60) in the drawing). . (I). When the rice cooking switch (10) is operated, the preliminary cooking process (A) starts first, and in the preliminary cooking process (A),
The first precooking process (A1) and the kettle (1) to keep the inside of the kettle (1) at 30 ℃
The second precooking step (A2) for keeping the inside temperature at 36 ° C is sequentially performed.

That is, when the rice cooking switch (10) is operated, first, the first preliminary cooking step (A1) starts, the gas valves (22) and (23) are opened, and the gas burner (2) is ignited. By executing this, the gas burner (2) is burned and the timer (T) for measuring the duration of the preliminary cooking operation is reset (see step 611 of the drawing). (C). Next, the temperature inside the kettle detected by the temperature sensor (12) arranged on the lid (11) is judged to determine whether the temperature detected by the temperature sensor (12) has risen to (30-6) ° C or higher. (Refer to the step of drawing code (612)).

In this embodiment, the temperature inside the kettle (1) is adjusted to 30 ° C. (target temperature) during preliminary cooking. Therefore, the heat capacity of the kettle (1) should be taken into consideration. The gas burner (2) is extinguished when the temperature sensor (12) detects the above (30-6) ° C. Further, in this embodiment, the memory in the microcomputer of the heating control device (30) for storing the above (30-6) ° C. is the temperature setting device described in the prerequisite technique (written portion in the claims) of the present invention. In addition to this, the functional unit in the microcomputer that compares the temperature with the temperature detected by the temperature sensor (12) corresponds to the comparator. (C). When the temperature in the kettle (1) detected by the temperature sensor (12) rises above (30-6) ° C, the gas burner (2) is kept in a fire-extinguishing state (see the steps of the drawing symbols (6) and (13)). At the same time, the temperature detected by the temperature sensor (12) is (30-
6) Monitor whether there is a temperature drop below ℃ (drawing code (6
14)), when the temperature falls below the temperature, the gas burner (2) is burned again (see step of drawing code (615)) and the temperature in the kettle (1) rises to (30-6) ° C or more. The combustion control operation is moved to the step of the reference numeral (612) for judging whether or not the temperature is not increased.

In this case, since the gas burner (2) is extinguished when the temperature in the kettle (1) detected by the temperature sensor (12) rises to (30-6) ° C., a kettle with a large heat capacity is then used. After the residual heat stored in (1) has been diffused to the rice grains etc. in the kettle (1), the temperature in the kettle (1) is set to 3 above the target temperature.
The temperature has risen to or near 0 ° C. Then, the temperature inside the kettle (1) begins to drop due to natural heat dissipation from this temperature,
-6) When the temperature falls below ℃, the kettle (1) is heated again. As described above, according to the above, the gas burner (2) is extinguished when the temperature sensor (12) detects (3-6) ° C. which is a temperature lower than the target temperature by a predetermined temperature. (1) The inconvenience that the internal temperature greatly exceeds the target temperature of 30 ° C. during the preliminary cooking is prevented.

When the timer (T) reset in the step of the drawing symbol (611) has passed 3 minutes while the gas burner (2) is repeatedly burning and extinguishing, the gas burner (2) is put into the burning state. Maintain and reset the timer (T) again (see step in drawing number (617)), then temperature sensor (12)
Gas burner until the detected temperature rises to (36-6) ° C
The combustion control operation shifts to the second preliminary cooking step (A2) of burning (2). (D). Next, the temperature detected by the temperature sensor (12) becomes (36-
6) It is monitored whether or not the temperature exceeds ℃, and when the temperature is exceeded, the gas burner (2) is extinguished, and when the temperature drops below the temperature, the gas burner (2) is burned again. That is, the gas burner (2) is intermittently burned as in the first preliminary cooking step (A1), and the intermittent combustion is continued for 17 minutes (see step indicated by reference numeral (618) in the drawing).

This completes the preliminary cooking step (A). In this embodiment, the gas burner (2) is extinguished when the temperature inside the kettle (1) is lower than the target temperature by a predetermined temperature, but it may be burnt with low heat. <Main cooking process (B)> As shown in Fig. 3, in the main cooking process (B), the temperature in the pot (1) detected by the temperature sensor (12) is set to 95 ° C near the boiling point in 10 minutes. Temperature raising process to raise temperature
(B1) and the subsequent water evaporation step (B2) (see FIG. 3). Further, in the temperature raising step (B1), the temperature in the kettle (1) is raised to 70 ° C. in 7 minutes. The first heating step (B11),
It comprises a second temperature raising step (B12) of raising the temperature from 70 ° C. to 95 ° C. in 3 minutes. Also, this main cooking process
In (B), fuzzy control is executed to judge and evaluate both the unit rising temperature Hi and the correction coefficient X2, which will be described later, to determine the optimum combustion amount of the gas burner (2). In addition, the temperature sensor (12) attached to the lid (11) has the above-mentioned 9
When detecting 5 ° C, the inside of the kettle (1) is in a boiling state.

Next, referring to FIG. 2 etc., the main cooking step
Describe details of (B). (A). When the above preliminary cooking process (A) is completed, the proportional valve (2
Set the opening of 4) to about 1/8 of the fully open position and set the gas burner (2)
Is burned and this state is maintained for 1 minute (figure code (63)
See step (64)). (I). The current temperature h in the kettle detected by the temperature sensor (12) attached to the lid (11) is stored in the initial temperature memory h0 (see step of reference numeral (65)). (C). Next, while changing the combustion amount of the gas burner (2) at intervals of 10 seconds, the temperature inside the kettle (1) is controlled to 70 ° C. in 6 minutes (36 times).

Therefore, the temperature rise coefficient K = (70 ° C.-h 0) / 36 (“36” is the number of combustion control times of the gas burner (2) executed at intervals of 10 seconds in 6 minutes) is calculated. . As a result, the temperature (temperature increase coefficient K) at which the temperature is increased by heating control (10 seconds) per time is determined by calculation. In addition, the heating control number i is set to "1" and the gas burner
Initial temperature gradient Y required when correcting the combustion amount in (2)
Both 0 and Y1 are set to "h0" (see step (66)). (D). Next, the target temperature Q for raising the temperature inside the kettle (1) by the i-th control is set to the temperature sensor attached to the lid (11).
Calculation is performed using the detected temperature in (12), the temperature increase coefficient K, and the like. That is, the target temperature Q = the temperature stored in the initial temperature memory h0 + the temperature increase coefficient k × i is calculated (see step (67)). (E). When the target temperature Q is calculated, the difference between the actual kettle internal temperature h detected by the temperature sensor (12) and the target temperature Q is calculated, whereby the ith heating control continues for 10 seconds. Unit rising temperature H that needs to raise the temperature in the pot (1) in the meantime
Calculate i. That is, the unit rising temperature Hi = the temperature inside the kettle h-the target temperature Q is calculated (see the step (68) in the drawing).
Then, the pot (1) during the execution of the first temperature raising step (B11)
As shown in an enlarged view of the internal temperature (FIG. 4), the unit rising temperature Hi as the difference between the actual kettle temperature h and the target temperature Q is obtained. (F). Next, the pot temperature h detected by the temperature sensor (12) is stored in the pot temperature memory Yi for storing the pot temperature at the initial stage of the i-th control. That is, the pot temperature h detected by the temperature sensor (12) at the beginning of the first (i = 1) control is stored in the first pot temperature memory Y1 at the beginning of the second (i = 2) control. The temperature h in the pot detected by the temperature sensor (12) is stored in the second pot temperature memory Y2, and the temperature h in the pot detected by the temperature sensor (12) at the beginning of the i-th control is the i-th. It is sequentially stored in the kettle temperature memory Yi.

Then, the above-mentioned calculation (Yi-Yi-2) is carried out, and the temperature h inside the kettle in the kettle (1) at the time of performing the i-th control and two times before that (i-2 time) The actual temperature change L1 of the kettle (1) is calculated by taking the difference in the kettle temperature h during the heating control. Then, this is divided by 2 to calculate the temperature gradient X1. Then, the temperature gradient X1 shows the average of the temperatures actually raised in the kettle (1) by the control in the previous two times,
If the combustion amount of the gas burner (2) at the current time (during the i-th control) is maintained as it is, the temperature inside the kettle (1) rises by the temperature gradient X1 when the next (i + 1) th control is completed. It can be inferred that it is warm. The next i
Since the temperature in the kettle (1) that is going to be heated by the + 1st control is the temperature rising coefficient K, the ratio of these two is taken and
"Correction coefficient X2 = temperature gradient X1 / temperature increase coefficient K" is calculated (see step (69) in the drawing). That is, the temperature gradient X
When 1 and the temperature rise coefficient K match (when the actual temperature change in the kettle (1) matches the calculated temperature temperature rise coefficient K), the correction coefficient X2 is It becomes "1". (G). Next, the work of correcting the combustion amount of the gas burner (2) is performed from the unit rising temperature Hi and the correction coefficient X2 obtained in the steps of "(E)" and "(F)".

FIG. 5 shows the unit rising temperature Hi and the correction coefficient X2.
Is a matrix for searching the correction amount of the combustion amount of the gas burner (2) from the combination of
It is stored in the microcomputer of (30).
Unit rise temperature Hi calculated in the step "(e)" above
In the case of the maximum, it is necessary to considerably increase the combustion amount of the gas burner (2). Also, when the correction coefficient X2 is the minimum,
It is necessary to considerably increase the combustion amount of the gas burner (2).
Therefore, when the unit rising temperature Hi is maximum and the correction coefficient X2 is minimum (when it is necessary to greatly increase the combustion amount of the gas burner (2)), "Hi;Maximum" and "X" in FIG.
"+ Large" specified by "2;minimum" is selected in the microcomputer, and the combustion amount of the gas burner (2) is greatly increased. That is, the opening X of the proportional valve (24) is greatly increased.

Further, even if the unit temperature rise Hi is maximum,
When the correction coefficient X2 is "small" or "appropriate", "+ small" is selected from the matrix shown in the figure, and the combustion amount of the gas burner (2) is increased by a small amount. Furthermore,
Even if the unit rising temperature Hi is maximum, if the correction coefficient X2 is "large" or "maximum", that is, the rising temperature gradient in the kettle (1) is large and the correction coefficient X2 is the gas burner (2).
In the case of requesting reduction of the combustion amount of "0", "0" is selected from the matrix shown in the figure, and the combustion amount of the gas burner (2) (opening X of the proportional valve (24)) is maintained at the current state. Then, the control is executed in the step portion of the reference numeral (70) in FIG. In FIG. 5, "-small" and "-large" respectively indicate "slightly small" and "substantially small" the combustion amount of the gas burner (2).

Next, the opening X of the proportional valve (24) is added to the rice cooking amount memory Z which is initially set to "0" (see reference numeral (7)).
See step 1)). Then, the combustion state of the gas burner (2) is maintained for 10 seconds (see the step (72)), and it is continuously judged whether or not the heating control number i has reached 36 times, and the heating control number i If the number of times is 36 times or less, the value of the heating control number i is increased by "1" and the control is returned to the step of calculating the target temperature Q again (figure code (67)). See step).

In this way, the control is performed 36 times at intervals of 10 seconds to correct the combustion amount of the gas burner (2) in the first period.
Seven minutes after the start of the temperature raising step (B11), the temperature in the kettle (1) was increased to 70 ° C.
Up to. Then, every time the combustion amount of the gas burner (2) is corrected at the interval of 10 seconds, the proportional valve at that time is corrected.
The opening X of (24) (in this embodiment, the current value applied to the proportional valve (24)) is accumulated in the cooked rice amount memory Z. Then, as the amount of rice cooked increases, the combustion amount of the gas burner (2) increases and the proportional valve
Since the opening of (24) also becomes large, the contents of the rice cooking amount memory Z that stores the cumulative value of the opening of the proportional valve (24) every 10 seconds also becomes large. Therefore, by judging the contents of the cooked rice amount memory Z, a value proportional to the cooked rice amount can be found.

As a result, the first temperature raising step (B11) is completed. (H). Next, the heating control is performed in 3 minutes by changing the temperature in the kettle (1) to 9
The process proceeds to the second temperature raising step (B12) for raising the temperature to 5 ° C., and first, the proportional valve (24) is maintained in a half-open state and the gas burner (2) is burned for 30 seconds (step of reference numeral (74)). reference). (K). Next, the combustion amount of the gas burner (2) is controlled at 10 second intervals for 2 minutes and 30 seconds (15 times in total) to finally raise the temperature in the kettle (1) to 95 ° C. Drawing code (75) to perform the same control as the 1 temperature raising step (B11)
The step (84) is executed. In this case, the temperature rise coefficient K =
(95 ° C.-inside kettle temperature h0) / 15 (total number of control times), except that the maximum value of the number of heating control times i is “15”. ).

Also in the second temperature raising step (B12),
Proportional valve (24) that controls the combustion amount of the gas burner (2)
The opening X of 10 is accumulated every 10 seconds and the value is stored in the rice cooking amount memory Z.
(Refer to the step of drawing code (81)). As a result, the temperature raising step (B1) consisting of the first temperature raising step (B11) and the second temperature raising step (B12) is completed, and the temperature in the kettle (1) is reduced to 95% from the start of the main cooking step (B). The temperature raising step (B1) of raising the temperature to 0 ° C. is completed in 10 minutes. That is, the first heating step (B11) is completed in 7 minutes and the second heating step (B12)
Is completed in 3 minutes, and the temperature raising step (B1) is executed for 10 minutes in total.

Then, the temperature sensor (1
In the above state where the detected temperature of 2) has reached 95 ° C., the actual temperature inside the kettle (1) is slightly higher than this and the inside of the kettle (1) is in a boiling state. In this embodiment, in order to ensure the operation of raising the temperature inside the kettle to 95 ° C., the step of the reference numeral (95) is provided and the inside of the kettle (1) is set to 9
Whether or not the temperature has reached 5 ° C. is judged from the output of the temperature sensor (12). If the temperature inside the pot is below 95 ° C, the proportional valve (2
Fully open 4) and keep the gas burner (2) at maximum combustion for 3 minutes. (Ko). Next, the heating control shifts to the water evaporation process (B2) for evaporating the water in the kettle (1), and it is judged whether the contents of the cooked rice amount memory Z is larger than a predetermined value or not, and thereby the cooked rice amount is judged. (Refer to the step of drawing code (85)). When the content of the cooked rice amount memory Z is large, the temperature in the pot (1) at the time of changing the heating power, which will be described later, that is, the moisture evaporation temperature is set to 125 ° C., and the opening degree of the proportional valve (24) thereafter is set. X9 is set to "large" (set to 76% of maximum opening in this embodiment). Also, contrary to the above, the rice cooking amount memory Z
If the content is small and it is judged that a small amount of rice is to be cooked, set the water vaporization temperature A to 115 ° C and open the proportional valve (24) X
9 is set to "small" (in this embodiment, it is set to 57% of the maximum opening). Further, after that, the current time t is stored in the steaming time memory (T) necessary for determining the steaming time which will be described later (see step of reference numeral 87).
Then, in this state, the gas burner (2) is burned and the kettle (1) is
Allow the water inside to evaporate (see step (88)).

Next, the opening X9 of the proportional valve (24) is adjusted in accordance with the contents of the rice cooking amount memory Z to proceed the rice cooking operation. The water vaporization step (B2) proceeds at a constant speed. As a result, the time required for the water vaporization step (B2) becomes almost constant regardless of the amount of cooked rice. In the final stage of the water vaporization step (B2), the scenting heating (B22) can be performed for a short period of time, which gives a proper scent to the cooked rice. There is. That is, in the water vaporization step (B2), when the temperature of the bottom of the pot detected by the temperature sensor (31) is raised to the above-mentioned water vaporization temperature A (125 ° C for large-scale rice cooking, 115 ° C for small-scale rice cooking), proportional When the valve (24) is opened halfway and the gas burner (2) is burned with low heat to reach a temperature in the kettle (1) of 145 ° C, a volatile volatile aldehyde is generated and a scent component is generated. After that, the first and second gas valves (22) and (23) are closed to extinguish the gas burner (2), thereby completing the main cooking step (B) (steps indicated by reference numerals (89) to (91) in the drawing). reference). <Steaming process (C)> Next, the step of the drawing symbol (92) for executing the steaming process (C) for maintaining the steaming temperature (usually 96 ° C to 98 ° C) inside the kettle (1) is executed. , Pot
(1) It is judged whether or not 23 minutes have elapsed from the start of the water evaporation step (B2) in which the inside is in a boiling state (drawing code (93)
If the time has elapsed (when the cooked rice is in an alpha state), the rice cooking completion alarm is sounded and the entire cooking process is completed.

In the above embodiment, the heating power of the gas burner (2) in the water vaporization step (B2) was divided into two steps, large and small, depending on the amount of cooked rice. It is also possible to judge the amount of cooked rice of each type and switch the heating power in the water vaporization step (B2) in three stages or more. In such a case, the time required for the water vaporization step (B2) will be closer to a constant value regardless of the amount of cooked rice.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a rice cooker according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control program.

[Fig. 3] Graph showing the temperature inside the pot (1) when cooking rice

FIG. 4 is an enlarged view of a main part of FIG.

FIG. 5 is a matrix showing control rules used for fuzzy control.

FIG. 6 is an explanatory diagram of a conventional example.

FIG. 7 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 (1) ・ ・ ・ Kettle (2) ・ ・ ・ Gas burner (12) ・ ・ ・ Temperature sensor (32) ・ ・ ・ Temperature comparator (33) ・ ・ ・ Temperature setter

Claims (1)

[Claims] 1. A pot (1) heated by a gas burner (2).
A temperature sensor for detecting the temperature of the inner, combustion limit signal when the detected temperature of the former by comparing the temperature stored is equal to or greater than the latter set temperature temperature sensor for sensing temperature and temperature setter (33) the temperature comparator (32) issuing the provided firepower of gas burner (2) based on the output of the temperature comparator (32)
The combustion control apparatus of cooker which is adapted to control, hook
(1) Detect the temperature of the upper part of the cooked rice container
Detects the temperature of the temperature sensor (12) and the bottom of the pot (1)
And a temperature sensor (31) for
Until it reaches the temperature detected by the temperature sensor (12) and temperature
Temperature when compared with the temperature stored in the setter (33)
Gas burner (2) by the combustion limit signal of the comparator (32)
The heating power of the kettle is reduced and the inside of the kettle (1) is boiled.
From the water evaporation process after reaching the state of
The temperature detected by the temperature sensor (31) and the temperature setter (33)
Temperature comparator when the delivered cooked temperature matches
Extinguish the gas burner (2) with the combustion restriction signal of (32)
And set the temperature in each heating step
Te, rice cooker combustion control device stored in the temperature setting device (33) a predetermined temperature lower temperature than the target temperature which tends to warm.