JP2000033042A - Rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rice cooker in which the setting is easily changeable against difference in warmth keeping capacity and warmth keeping temp. of rice is stably kept in accordance with the change of room temp. SOLUTION: The rice cooker is provided with a bottom sensor 8 detecting cooked rice temp., a storage means 16b storing a warmth keeping temp. correcting pattern for correcting warmth keeping temp., a warmth keeping temp. setting means 16a setting the warmth keeping temp. correcting pattern, a warmth keeping temp. control means 16c outputting a warmth keeping control signal so as to obtain warmth keeping temp. based on the warmth keeping temp. correcting pattern and detected temp. from the bottom sensor 8, a heating control means 16d outputting a heating control signal to a warmth keeping heater based on the warmth keeping control signal, a conductive time related value detecting means 16g detecting a conductive time to the warmth keeping heater and a warmth keeping temp. changing means 16e changing warmth keeping temp. to be the new one based on the conductive time and the warmth keeping temp. correcting pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker which maintains a stable rice warm state in response to a change in room temperature.

[0002]

2. Description of the Related Art FIG. 13 is an overall configuration diagram of a conventional rice cooker disclosed in Japanese Patent Publication No. 5-54968. In the figure, 52
Are rice cooking heaters 52 and 53 for heating the pot 51 from the bottom.
Is a first heater for heat retention provided on the outer periphery of the upper part of the kettle;
Is a second warming heater provided on the side of the lid facing the rice in the pot, 57 is provided in a support body 56 for storing and supporting the pot 51 in the outer box 55 so as to be in close contact with the bottom of the pot 51, It is a pot bottom sensor as a rice temperature detecting means for detecting the rice temperature in the pot.

[0005] 58 is a temperature control means for inputting a detection signal of the kettle bottom sensor 57 and sending out a heat retention control signal for controlling the temperature of the rice in the pot to a predetermined heat retention temperature (72 ° C.), and 59 is based on the heat retention control signal. This is a heating means for sending a heating control signal to the rice heating heater 52 for heating the cooking pot and the first and second heat retaining heaters 53 and 54. 60 is a conduction rate detecting means for detecting the conduction rate of the heating control signal sent to the heating means,
61 is cooked rice and 62 is water.

Next, the operation will be described with reference to the flowchart of FIG. First, after completion of the rice cooking and steaming processes, a warming process is started, and a constant temperature is controlled to a set temperature (72 ° C.) by low heat (step S51). Then, the temperature control means 58 detects whether or not the detected temperature detected by the kettle bottom sensor 57, that is, the rice temperature is the set temperature (step S52), and heats the heat retention control signal corresponding to the difference from the set temperature. It is sent to the control means 59 to control the heating means 52 to 54. At this time, the duty ratio detecting means 60 detects the duty ratio of the heating control signal sent to the heating means by detecting the ON / OFF ratio of the signal (step S53) and according to the ratio, for example, the length of the ON period. Correction signal, that is, temperature control means 5
(Step S)
54) Then give.

In this case, the duty ratio detecting means 60 sends a correction signal so as to lower the heat retention control temperature because the temperature of the rice rises when the ambient temperature falls and the duty ratio rises.
Conversely, when the ambient temperature rises, a correction signal is sent so that the duty ratio decreases and the heat retention control temperature increases.

[0006]

As described above, since the conventional rice cooker is constructed, the first and second heat retaining heaters 53 and 54 are controlled by a correction signal for the duty ratio of a preset heating control signal. To control, for example, 0.
If the cooking volume is different depending on the main body, such as 5 liter cooking, 1.0 liter cooking, and 1.8 liter cooking, if the heat retention capacity is different, it is necessary to change the correction factor, and it is necessary to set the control for each heat retention capacity. There is a problem that there is. In addition, there is also a problem that it takes a long time to reach the optimum temperature because the correction value is not determined until the optimum temperature is maintained until the intended temperature is maintained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to easily change the setting for the difference in the heat retaining capacity of the rice cooker main body, and to stably keep the rice cooked in response to a change in room temperature. An object of the present invention is to provide a rice cooker that can maintain a temperature and can quickly control a target heat retaining temperature.

[0008]

SUMMARY OF THE INVENTION A rice cooker according to the present invention stores cooked rice temperature detecting means for detecting the temperature of cooked rice and a plurality of warming temperature correction patterns for correcting a predetermined warming temperature of cooked rice. A storage means, a heat retention temperature setting means for setting a heat retention temperature correction pattern selected from the plurality of heat retention temperature correction patterns, and a heat retention temperature correction pattern and a cooked rice temperature detection means set by the heat retention temperature setting means. A heat-retention temperature control means for outputting a heat-retention control signal so that the heat-retention temperature is obtained based on the detected temperature; a heating control means for outputting a heat-control signal for the heat retention heater based on the heat-retention control signal; An energization time-related value detecting means for detecting an energization time-related value,
Insulation temperature changing means for changing the insulated temperature to a new insulated temperature based on the energized time related value input from the energized time related value detection means and the insulated temperature correction pattern selected by the insulated temperature setting means. And.

In addition, the value related to the energizing time is defined as the energizing time.

The heat retaining temperature setting means selects a heat retaining temperature correction pattern based on the operation of the changeover switch.

The heat-retention temperature setting means selects the heat-retention temperature correction pattern by changing the resistance with a variable resistor.

Further, the energization time related value is set to a non-energization time.

[0013] The value related to the energization time is defined as the energization rate.

Further, the energization time-related value is a non-energization rate.

Further, the power-on time related value is a ratio of the power-on time to the non-power-on time.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described. FIG. 1 is a block diagram of a rice cooker according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view of the rice cooker. In the figure, 1 is a bottomed cylindrical main body, 2 is a main body 1
A cylindrical outer pot with a built-in bottom
Have been suspended. Reference numeral 3 denotes a cylindrical inner pot having a bottom, and 4 denotes a lid which closes an upper opening of the inner pot 3. Reference numeral 5 denotes a bottom heater disposed so as to contact the bottom of the inner pot 3, 6 denotes a body heater disposed on the outer periphery of the outer pot 2, and 7 denotes a lid heater disposed on the lid 4. . Reference numeral 8 denotes a bottom sensor, which is a rice temperature detecting means for contacting the bottom of the inner pot 3 and detecting the temperature of the inner pot, and a thermistor or the like is used.

Reference numeral 9 denotes a control board. The control board 9 includes an energization time-related value of a heat insulation heater for detecting an energization time, which is an energization time-related value of the bottom heater 5, the body heater 6, and the lid heater 7, which are heat insulation heaters. A changeover switch 10 for selecting the detection means 16g and the correction pattern of the warming temperature is provided.
11 is a rice cooker key for starting rice cooker, 12 is a heat retention key for manually starting the heat retention, 13 is a rice cooker, a cancel key for canceling the heat retention process, 14 is a rice cooker LED that is lit only during rice cooking, and 15 is a light only during the heat retention. It is a heat keeping LED.

Reference numeral 16 denotes a microcomputer provided on the control board 9;
A temperature keeping temperature setting means for selecting a temperature keeping temperature correction pattern by selecting a temperature keeping temperature from a plurality of temperature keeping temperature correction patterns stored in advance in the storage means 16b by the operation of
Is a warming temperature control means for controlling the warming temperature based on the correction pattern set by the warming temperature setting means 16a;
d is a heating control unit that outputs a heating signal to the bottom heater 5, the body heater 6, and the lid heater 7, which are heat keeping heaters, based on the control of the heat keeping temperature control unit 16c, and 16e is an input of the conduction time related value detection unit 16g. A heat-retention temperature changing means for changing the heat-retention temperature by a signal;
g is a timer for measuring the temperature change timing of the heat retention temperature.

FIG. 3 is a circuit diagram of the first embodiment of the present invention. In FIG.
0V), 18 is a relay and the contact 18 is connected in series with the bottom heater 5. The relay coil 18b is connected to one terminal of a power supply via a transistor 19.
One end of the transistor 19 is connected to an output port a of the microcomputer 16 via a resistor.
Reference numeral 20 denotes a triac A, one end of which is connected to one terminal of the power supply, the other end of which is connected to the body heater 6 which is connected in series with the bottom heater 5, and the other end of which is connected to the output port b of the microcomputer 16. . 21 is Triac B,
One end is connected to the lid heater 7 and the other terminal is connected to the output port c of the microcomputer 16.

The input ports d, e, and f of the microcomputer 16 are respectively provided with a rice cooker key 11, a warmer key 12,
A cancel key 13 is connected in parallel, one end of which is connected to the rice cooker LED 14 and the warmer LED 15 via the resistors R1 and R2, respectively, and to the output ports i and j of the microcomputer 16, respectively.

One end of the bottom sensor 8 is connected to the bottom sensor 8.
Is connected to the input port g via R5 from between R and R3,
The other end is the rice cooking key 11, the heat retention key 12, the cancellation key 13
Are connected to each other, and are arranged in parallel.
One end of the changeover switch 10 is connected to 0 V via a resistor R4, and connected between the changeover switch 10 and the resistor R4 to an input port b via a resistor R6.

The changeover switch 10 has a three-stage switch. The resistor R9 is connected to the notch N1, the resistor R8 is connected to the notch N2, and the resistor R7 is connected to the notch N3. These notches N1, N2,
N3 corresponds to correction patterns A, B, and C shown in FIG. R7 is, for example, 10KΩ, R8 is 20KΩ, R9
Is 30 KΩ and R4 is 10 KΩ, so that the input voltage input to the port h is 1.25 at the time of the notch N1.
V and 1.67 V for the notch N2 and 2.5 V for the notch N3.

FIG. 4 is a diagram showing a correction rank with respect to the energization time of the heat retaining heater and a correction value in each correction pattern according to the first embodiment of the present invention. FIG. 5 is a graph of the heat retention control temperature with respect to the room temperature in FIG.

Next, the operation will be described. 6 to 8 are flowcharts of the present invention. When rice and water are put into the inner pot 3 and the rice cooker key 11 is pressed, the signal is input to the input port d of the microcomputer 16. In response to the input signal, the rice cooking control means (not shown) in the microcomputer 16 operates, and the rice cooking heating control means (not shown).
Operates, the transistor 19 forms a closed circuit by a signal from the output port a, and the coil 18b of the relay 18
Are excited, the relay contact 18a is closed, and the bottom heater 5 is energized.

At the same time, the rice-cooking LED is turned on via the output port i of the micro-computer 16. By the heating of the bottom heater 5, the water in the inner pot 3 rises in temperature and boils to cook rice. As the boiling continues, part of the water in the inner pot 3 is absorbed by the rice, and the other is released as steam to the outside.
When the water in the inner pot 3 disappears, the temperature of the inner pot 3 rises rapidly, and the bottom sensor 8 detects this temperature, and inputs the detection signal to the input port g of the microcomputer 16. When the input signal is received by the rice cooking control means (not shown), the rice cooking control means inputs a signal to the rice heating control means (not shown), and the rice heating control means (not shown) is operated by this input signal. Then, the transistor 19 is opened by a signal from the output port a.

The contact 18a of the relay 18 which has been excited by the circuit of the transistor 19 is opened, and the bottom heater 5
Is stopped, and the rice cooking LED 14 is also turned off. Subsequently, a warming step is performed. That is, step S1
Then, the warming LED is turned on via the output port j of the microcomputer 16 (step S2). At the same time, Triac A20 and Triac B21
Is operated, and in step S3, what is the correction rank of the final heat retention temperature correction value (based on FIG. 4) at the time of the previous heat retention is called from the storage means 16b (if the heat retention is performed for the first time after RESET, FIG. The data of the correction rank 3 is called), and the correction rank is selected in step S4. For example, when the previous correction rank is 3, the room temperature during the previous heat retention is 20 ° C., and the corresponding heat retention temperature T
(72 ° C.).

Next, at step S5, the changeover switch 10
Is determined by the warming temperature setting means 16a. If the result of the determination is notch N1, the correction pattern A preset from the memory means 16b is called into the warming temperature setting means 16a in step S6. The energization of the heater 5, the body heater 6, and the lid heater 7 is started, and the timer 16f is started in step S7. Next, in step S8, the energization time of the heat retaining heater is measured by the energization time related value detection means 16g. Then, in step S9, the timer 1
6f starts and a predetermined time (3
0 minutes), the time measurement is continued and t = 3
If it is 0 minutes, the process proceeds to step S10.

In step S10, a signal from the power-on time-related value detecting means 16g is input to the heat retaining temperature changing means 16e. For example, if the energization time is 105 seconds / 30 minutes, the room temperature is estimated to be 15 ° C., and based on the input signal, the heat retaining temperature changing means 16e changes the temperature difference (△) from the standard room temperature (20 ° C.).
t = 15 ° C.−20 ° C. = − 5 ° C.). Based on the calculated Δt (−5 ° C.), the heat retaining temperature changing unit 16e sets a new heat retaining temperature TA to a preset TA = T0 +
Calculate by 0.1 (± Δt) (that is, TA = 72 ° C.)
+0.1 (−5 ° C.) = 73.5 ° C.). T0 is a predetermined warming temperature (72 ° C.) at the standard room temperature (20 ° C.).

The temperature control means 16c controls the temperature to a newly set temperature TA (73.5 ° C.). Next, in step S11, the detected temperature change T detected by the bottom sensor 8 is input to the warming temperature control means 16c. The input detection temperature T is compared with TA (73.5 ° C.), and if the result is T ≧ TA, in S12, the heating control unit 16d sets the heating device, that is, the bottom heater 5, the body heater 6, the lid heater 7 is turned off by the triac A22 and the triac B21. If T ≧ TA, the heating device is turned on by the triac A20 and the triac B21 in step 13. Next, at step 14, it is determined whether or not the measurement by the timer 16f is being performed. That is, if t = 0, the flow returns to step S7 to repeat the above operation. If not t = 0, the flow returns to step S8 to repeat the above operation, and corresponds to the room temperature of the correction pattern A as shown in FIGS. The calculated heat retention temperature TA is calculated, and the rice temperature is maintained at a constant heat retention temperature.

Next, if it is determined in step S5 that the correction key 10 is not N1, it is determined in step 15 shown in FIG. 7 whether the correction key 10 is N2. If the determination is N2, a preset correction pattern B is called from the storage means 18b to the heat retaining temperature setting scene 16a in step S16. Next, in step S17, the timer 16f is started.

Next, in step S18, the energization time of the heat retaining heater is measured. If the timer 16f is started in step S19 and the preset time (30 minutes) has not been reached, the time measurement is continued. If t = 30 minutes, the process proceeds to step S20, where a signal from the power-on time-related value detecting means 16g is input to the heat retaining temperature changing means 16e. For example, if the energization time is about 105 seconds / 30 minutes, the room temperature is estimated to be 15 ° C., and based on the input signal, the warming temperature changing means 16e determines the temperature difference (Δt = 15) from the standard room temperature (20 ° C.). -20 ° C = -5 ° C). Based on the calculated Δt (−5 ° C.), the heat retaining temperature changing means 16 e
Is the new heat retention temperature TA set in advance to TA = T
0 + 0.2 (± Δt) (that is, TA = 7)
2 ° C + 0.2 (-5 ° C) = 73 ° C).

The heat retaining temperature control means 16c controls the temperature to a newly set heat retaining temperature TA (73 ° C.). Next, in step S21, the detected temperature T detected by the bottom sensor 8 is input to the heat retaining temperature control means 16c. The input detection temperature T is compared with TA (73 ° C.), and the result is T ≧ TA
If so, in S22, the heating control unit 16d turns off the heating devices, that is, the bottom heater 5, the body heater 6, and the lid heater 7 by the triac A22 and the triac B21, and T ≧
If it is not TA, in step 23, the heating device is turned on by the triac A20 and the triac B21. Next, at step 24, it is determined whether or not the measurement by the timer 16f is being performed. That is, if t = 0, step S1
7, the above operation is repeated unless t = 0, the process returns to step S18, and the above operation is repeated. As shown in FIG. 4 and FIG.
A is calculated, and the rice temperature is maintained at a constant temperature.

Next, if it is determined in step S5 that the correction key 10 is not N1, it is determined in step S15 whether the correction key 10 is N2. If the determination is not N2, the preset correction pattern C is stored in the storage means 16b in step S25 shown in FIG.
Call. Next, in step S26, the timer 16f is started. Next, in step S27, the energization time of the heat retaining heater is measured by the energization time detection means 16g. If the timer 16f is started in step S28 and the preset time (30 minutes) has not been reached, the time measurement is continued. If t = 30 minutes, the process proceeds to step S29.

In step S29, the energizing time detecting means 1
The signal from 6g is input to the warming temperature changing means 16e.
For example, if the energization time is 105 seconds / 30 minutes, the room temperature is 15 ° C.
It is presumed that the warming temperature changing means 1 is based on the input signal.
6e is the temperature difference (Δt = 15) from the standard room temperature (20 ° C.).
-20 ° C = -5 ° C). This calculated Δt
(−5 ° C.), the heat retention temperature changing means 16e sets the new heat retention temperature TA to a preset TA = T0 + 0.3.
(± △ t) (that is, TA = 72 ° C. + 0.
3 (−5 ° C.) = 72.5 ° C.).

The heat-retention temperature control means 16c sets the heat-retention temperature control means 1 to the newly set heat retention temperature TA (72.5 ° C.).
6c controls. Next, in step S30, the detected temperature T detected by the bottom sensor 8 is input to the heat retaining temperature control means 16c. This input detected temperature T and TA (72.5 ° C)
If the result is T ≧ TA, in S31, the heating control means 16d turns off the heating device, that is, the bottom heater 5, the body heater 6, and the lid heater 7 with the triac A22 and the triac B21. If not, in step 32, the heating device is turned on by the triac A20 and the triac B21.

Next, at step 33, it is determined whether or not the measurement by the timer 16f is being performed. That is, if t = 0, the process returns to step S26 to repeat the above operation. If not t = 0, the process returns to step S27 to repeat the above operation, and corresponds to the room temperature of the correction pattern C as shown in FIGS. The calculated heat retention temperature TA is calculated, and the rice temperature is maintained at a constant heat retention temperature.

The above operation is repeated to maintain a constant rice temperature. If the cancel key 13 is depressed during the above operation, the warming operation is terminated by the signal. After the operation is completed, if the heat retention key is pressed, the above-described operation is performed.

As described above, since the heat retaining temperature is also minutely changed in response to the minute change in room temperature, the temperature of the cooked rice in the inner pot can be easily kept constant. In addition, even if the capacity of the rice cooker is different, for example, 1.0 liter, 1.5 liter, or 1.8 liter, a stable heat retaining temperature of cooked rice can be maintained by changing the heat retaining correction pattern. Further, since the correction rank at the time of the previous heat retention is stored and the correction value is stored, the optimum correction can be quickly performed, and the time required to reach the optimal heat retention temperature can be shortened and better temperature retention can be performed.

Embodiment 2 In the first embodiment, a three-stage correction pattern is provided by the changeover switch 10 and the fixed resistances of the resistors R7, R8, and R9. However, in the second embodiment, a variable resistor capable of freely changing the resistance value is used instead. Yes, furthermore, a fine change pattern can be set, and fine correction of the heat retention temperature can be performed.

Embodiment 3 In the first embodiment, the energization time of the heat retention heater (consisting of the bottom heater 5, the body heater 6, and the lid heater 7) per unit time (30 minutes) is measured.
Although the rank of the correction is set, in the third embodiment, as shown in FIG. 9, the energization time-related detection unit 16g of FIG. The operation is performed by replacing the measurement of the heater energization time in step S8 of FIG. 6, the step S18 of FIG. 7, and the step S28 of FIG. 8 with the non-energization time measurement. It is a thing.

According to this configuration, the temperature of the cooked rice in the inner pot can be easily maintained at a constant temperature because the heat retention temperature is also minutely changed in response to the minute change of the room temperature.

Embodiment 4 In the first embodiment, the energization time of the heat retention heater (consisting of the bottom heater 5, the body heater 6, and the lid heater 7) per unit time (30 minutes) is measured.
Although the rank of the correction is set, in the fourth embodiment, the energization time-related value detecting means 16g of FIG. 1 of the first embodiment uses the energization time-related value as shown in FIG. The correction rank is set, and the operation is performed in step S8 in FIG. 6, step S18 in FIG. 7, step S2 in FIG.
8 is obtained by replacing the measurement of the heater energization time with the measurement of the energization rate.

According to this configuration, the temperature of the cooked rice in the inner pot can be easily maintained at a constant temperature because the heat retention temperature is also minutely changed in response to the minute change of the room temperature.

Embodiment 5 FIG. In the first embodiment, the energization time of the heat retention heater (consisting of the bottom heater 5, the body heater 6, and the lid heater 7) per unit time (30 minutes) is measured.
Although the rank of the correction is set, in the fifth embodiment, the energization time related value detecting means 16g of FIG. 1 of the first embodiment uses the energization time related value as shown in FIG. The operation is performed in step S8 in FIG. 6, step S18 in FIG. 7, step S8 in FIG.
28, the measurement of the heater energization time is replaced with the measurement of the non-energization rate.

With this configuration, the temperature of the cooked rice in the inner pot can be easily maintained at a constant temperature because the heat retention temperature is also minutely changed in response to the minute change in the room temperature.

Embodiment 6 FIG. In the first embodiment, the energization time of the heat retention heater (consisting of the bottom heater 5, the body heater 6, and the lid heater 7) per unit time (30 minutes) is measured.
Although the rank of the correction is set, in the sixth embodiment, the energization time-related value detecting means 16g of FIG. The operation is performed by measuring the heater energizing time in step S8 in FIG. 6, step S18 in FIG. 7, and step S28 in FIG. 8 to measure the ratio of heater energizing to non-energizing. It has been replaced.

With this configuration, the temperature of the cooked rice in the inner pot can be easily maintained at a constant temperature because the heat retention temperature is also minutely changed in response to the minute change in the room temperature.

[0048]

Since the present invention is configured as described above, it has the following effects.

A rice temperature detecting means for detecting the temperature of the rice in the pot, a storage means for storing a plurality of heat insulation temperature correction patterns for correcting a predetermined heat insulation temperature of cooked rice, and a plurality of heat insulation temperature correction patterns selected from the plurality of heat insulation temperature correction patterns. A temperature maintaining means for setting a temperature maintaining temperature correction pattern, and a temperature maintaining control based on the temperature maintaining pattern set by the temperature maintaining temperature setting means and the temperature detected from the rice temperature detecting means. A heat retention temperature control unit that outputs a signal, a heating control unit that outputs a heating control signal to the heat retention heater based on the heat retention control signal, and a conduction time related value detection unit that detects a conduction time related value to the heat retention heater. , The energization time-related value input from the energization time-related value detection means and the insulation temperature compensation value selected by the insulation temperature setting means. A heat retention temperature changing means for changing the heat retention temperature to a new heat retention temperature based on the pattern, so that it is possible to easily change the setting for the difference in the heat retention capacity of the rice cooker main body and to cope with a change in room temperature. Thus, it is possible to maintain a stable rice keeping temperature and to quickly control the target rice retaining temperature.

Further, since the energization time-related value is set to the energization time, it is easy to change the setting for the difference in the heat retention capacity of the rice cooker body, and to maintain a stable rice heat retention temperature in response to a change in room temperature. In addition, it is possible to quickly control the temperature to a desired temperature.

Further, since the warming temperature setting means selects the warming temperature correction pattern based on the operation of the changeover switch, it is possible to easily change the setting for the difference in the warming capacity of the rice cooker main body.

Further, since the warming temperature setting means selects the warming temperature correction pattern by changing the resistance by the variable resistor, a fine change pattern can be set, and the warming temperature can be finely corrected.

Further, since the energization time related value is set to the non-energization time, it is easy to change the setting for the difference in the heat retention capacity of the rice cooker main body, and to maintain a stable rice heat retention temperature in response to a change in room temperature. be able to.

Further, since the energization time-related value is defined as the energization rate, it is possible to easily change the setting for the difference in the heat retention capacity of the rice cooker main body, and to maintain a stable rice heat retention temperature in response to a change in room temperature. Can be.

Further, since the energization time-related value is set to the non-energization rate, it is easy to change the setting for the difference in the heat retention capacity of the rice cooker main body, and to maintain a stable rice heat retention temperature corresponding to the change in room temperature. be able to.

Further, since the energizing time related value is defined as the ratio of energizing time to non-energizing time, it is possible to easily change the setting for the difference in the heat retention capacity of the rice cooker body, and to stabilize the rice cooker in response to changes in room temperature. Insulation temperature can be maintained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a rice cooker according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view of the rice cooker according to Embodiment 1 of the present invention.

FIG. 3 is a circuit diagram of the rice cooker according to Embodiment 1 of the present invention.

FIG. 4 is a correction pattern diagram according to the first embodiment of the present invention.

FIG. 5 is a correction pattern graph according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating the operation of the first embodiment of the present invention.

FIG. 7 is a flowchart illustrating the operation of the first embodiment of the present invention.

FIG. 8 is a flowchart illustrating the operation of the first embodiment of the present invention.

FIG. 9 is a correction pattern diagram according to the third embodiment of the present invention.

FIG. 10 is a correction pattern diagram according to a fourth embodiment of the present invention.

FIG. 11 is a correction pattern diagram according to a fifth embodiment of the present invention.

FIG. 12 is a correction pattern diagram according to a sixth embodiment of the present invention.

FIG. 13 is an overall configuration diagram of a conventional rice cooker.

FIG. 14 is a flowchart illustrating the operation of a conventional rice cooker.

[Explanation of symbols]

4 lid, 5 bottom heater, 6 body heater, 7 lid heater, 8 bottom sensor, 10 changeover switch, 16
Microcomputer, 16a insulation temperature setting means,
16b storage means, 16c heat retention temperature control means, 16d
Heating control means, 16e Heat retention temperature changing means, 16f
Timer, 16g Energizing time related value detection means.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshio Nishimura 1728 Koeda, Oaza, Hanazono-cho, Osato-gun, Saitama F-term in Mitsubishi Electric Home Equipment Co., Ltd. 4B055 AA02 BA09 BA23 BA64 CA01 CA64 CA66 CA71 CB27 CC17 CC18 CD02 CD04 CD22 CD51 CD57 DA02 DA03 DA04 DB02 DB21 DB22 GA03 GB09 GB11 GC06 GC15 GC26 GC40 GD01 GD02 GD05

Claims (8)

[Claims] 1. A rice temperature detecting means for detecting the temperature of cooked rice, a storage means for storing a plurality of heat insulation temperature correction patterns for correcting a predetermined heat insulation temperature of cooked rice, and a plurality of heat insulation temperature correction patterns. A heat retention temperature setting means for setting the selected heat retention temperature correction pattern; and the heat retention temperature based on the heat retention temperature correction pattern set by the heat retention temperature setting means and the temperature detected by the cooked rice temperature detection means. A heat retention temperature control means for outputting a heat retention control signal; a heating control means for outputting a heating control signal to the heat retention heater based on the heat retention control signal; and a power supply time related value detection for detecting a power supply time related value to the heat retention heater. Means, the energization time-related value input from the energization time-related value detection means, and the heat insulation temperature selected by the heat insulation temperature setting means. A rice cooker comprising: a heat retention temperature changing unit that changes the heat retention temperature to a new heat retention temperature based on a degree correction pattern. 2. The rice cooker according to claim 1, wherein the energization time related value is an energization time. 3. The rice cooker according to claim 1, wherein the heat retention temperature setting means selects a heat retention temperature correction pattern based on an operation of a changeover switch. 4. The rice cooker according to claim 1, wherein the heat retaining temperature setting means selects the heat retaining temperature correction pattern by changing a resistance by a variable resistor. 5. The rice cooker according to claim 1, wherein the energization time related value is a non-energization time. 6. The rice cooker according to claim 1, wherein the energization time-related value is an energization rate. 7. The rice cooker according to claim 1, wherein the energization time-related value is a non-energization rate. 8. The rice cooker according to claim 1, wherein the energization time-related value is a ratio of energization time to non-energization time.