JP2643845C - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION       [0001]     [Industrial applications]   The present invention is directed to an electric rice cooker which is capable of always maintaining a good heat retaining state of rice.
It is about.       [0002]     [Prior art]   Many electric rice cookers currently used have a constant setting of about 72 to 74 ° C.
Rice is discolored if the temperature is too high (hereinafter, brown).
Because it becomes hard, and if the heat retention temperature is too low, it smells rotten.
The heat retention temperature is set in the middle between the two.       [0003]   In the case of an electric rice cooker currently in use, a heating heater is activated at the same time as rice cooking is completed.
It is turned on to start warming.       [0004]     [Problems to be solved by the invention]   However, the temperature of rice at the end of rice cooking is so high that it does not need to be kept warm.
Rot is unlikely to occur, and it is necessary to keep warm after a predetermined time has elapsed.       [0005]   By the way, the lower the heat retention temperature, the better the rice heat retention condition, and the lower the heat retention temperature.
If it keeps for a long time, it rots.
There is a technical difficulty in Iiwara.       [0006]   Therefore, immediately after the completion of rice cooking, the temperature of the rice is so high that it is not necessary to keep the heat, so that the heater is turned on.
Heating heater from the time when the temperature of rice is reduced to the extent that it is necessary to keep warm without N
Is turned on, and if the heat retention temperature is set higher as the heat retention time elapses,
It will save power and will be able to maintain the insulation very well.
Thus, the present invention has been made by paying attention to the above.       [0007]   The present invention has been made in view of the above points, and while saving power consumption,
The purpose is to improve the heat retention of rice.       [0008]     [Means for Solving the Problems]   The electric rice cooker according to the present invention includes a temperature detecting means for detecting the temperature of the rice cooker.
Control the energization of the rice cooker and the heater based on the temperature information from the outlet means.
In an electric rice cooker that is configured to
And change the set warming temperature from a temperature lower than the normal warming temperature to a higher temperature.
Means for changing the set warming temperature, and the setting temperature changed and set by the means for changing the warming temperature.
Power supply control means for controlling power supply to the warming heater so that the temperature of the rice cooker becomes equal to the temperature.
The setting for changing the set warming temperature by the set warming temperature changing means is provided at the time of constant warming.
It should be done so that the temperature rises gradually as the time elapses.
This is preferable in that the set temperature can be changed and set while the number of steps of the setting process is reduced.       [0009]   In addition, the setting for changing the set heat-retention temperature by the set heat-retention temperature changing means is a heat-retention time.
In order to increase the temperature in proportion to the progress of
This is preferable because it can be performed finely.       [0010]   In addition, the set insulation temperature changed and set by the set insulation temperature changing means has an upper limit value.
Is preferable in that it is possible to prevent the heat retention temperature from becoming too high.       [0011]   A warming timer switch for setting a meal time after the warming is started;
When the meal time is set by the timer switch, the set warming temperature changing means
Set the warming temperature so that the warming temperature becomes the upper limit after the set time has elapsed.
It is recommended that a command means for instructing the user to change the
Can keep the rice at a high temperature (in other words, the hot rice is automatically
Obtained from the above).       [0012]   Also, when the heat insulation switch is turned on, it is set regardless of the elapse of the heat insulation time.
A fixed insulation temperature setting means for setting the insulation temperature to a constant value is provided,
The change setting of the set warming temperature by the warming temperature changing means and the fixed warming temperature setting means It is at the user's will to provide a selection means for selecting a fixed setting of the warming temperature.
This is preferable because two more heat retaining states can be appropriately selected.       [0013]   Further, the fixed setting of the set heat retaining temperature by the fixed heat retaining temperature setting means is canceled by the switch.
When turning on the switch or resetting the riceware, many users
It is preferable in that good heat retention corresponding to various use forms can be obtained.       [0014]   Also, an alarm is provided to warn the user when the heat retention time exceeds a predetermined time.
It is preferable to provide such an apparatus because it can warn a user of deterioration of rice due to long-time heat retention.       [0015]     [Action]   In the electric rice cooker of the present invention, the following effects can be obtained by the above means.       [0016]   In other words, according to the elapse of the heat retention time from the end of rice cooking, the set heat retention temperature is the normal heat retention temperature.
The settings are changed from lower temperature to higher, and thus the changed settings
By controlling the power supply to the warming heater so that the temperature of the rice cooker becomes the temperature of the rice cooker,
If the set temperature is set low at the end of the rice (ie, at the start of the heat retention), the rice cooking will end.
The temperature of the rice cooker is reduced to the set temperature from the point in time, and
It is possible to gradually increase the temperature from the constant temperature. That is, there is a risk of spoilage immediately after cooking rice.
If there is no temperature, lower the temperature to the set temperature and keep it
If the temperature is long and the heat retention time is long and there is a risk of decay,
The temperature can be kept at a low temperature.
If you set the temperature to increase gradually as the fixed heat retention time elapses,
Change of set temperature The change of set temperature can be performed while reducing the number of process steps.
Wear.       [0017]   In addition, the setting for changing the set heat-retention temperature by the set heat-retention temperature changing means is a heat-retention time.
If the setting is made to increase in proportion to the progress of
Can be performed finely according to the elapse of the heat retention time.       [0018]   In addition, the set insulation temperature changed and set by the set insulation temperature changing means has an upper limit value.
If the temperature is set too high, the heat retention temperature will be too high and the rice will deteriorate (in other words, brown)
Can be prevented.       [0019]   A warming timer switch for setting a meal time after the warming is started;
When the meal time is set by the timer switch, the set warming temperature changing means
Set the warming temperature so that the warming temperature becomes the upper limit after the set time has elapsed.
Command means for instructing the user to change the setting of
In addition, rice can be kept at a high temperature (in other words, hot rice is automatically
Obtained).       [0020]   Also, when the heat insulation switch is turned on, it is set regardless of the elapse of the heat insulation time.
When a fixed heat retention temperature setting means for setting the heat retention temperature to a constant value is attached,
In this case, a good heat insulation state is obtained, and the setting by the set heat insulation temperature changing means is performed.
Change setting of constant heat retention temperature and fixed setting of heat retention temperature set by the fixed heat retention temperature setting means
If a selection means for selecting the temperature is provided, two heat retention states can be set according to the user's will.
It can be selected as appropriate.       [0021]   Further, the fixed setting of the set heat retaining temperature by the fixed heat retaining temperature setting means is canceled by the switch.
When priority is given when the switch is turned on or when the rice cooker is reset
, The user's various usage patterns (that is, when a normal usage pattern is not taken)
Good insulation (that is, insulation by the insulation control based on the fixed set insulation temperature)
can get.       [0022]   Also, an alarm is provided to warn the user when the heat retention time exceeds a predetermined time.
If it is installed, the quality of the rice due to long-time heat retention (in other words, browning)
Can be warned.       [0023]     【The invention's effect】   According to the electric rice cooker of the present invention, the temperature information from the temperature detecting means after the rice cooking is completed
Based on the temperature of the rice cooker is lowered to the set insulation temperature, which is lower than the normal insulation temperature
Set the warming temperature higher than the normal warming temperature as the warming time elapses.
Is set so that the temperature of the rice cooker reaches the set temperature
The energization of the heat retention heater is controlled as described above, so that the rice cooking end point (that is,
If the heat retention temperature is set low, the rice cooker temperature will be set from the end of rice cooking.
Reduce the temperature to the constant temperature and keep it warm from the set temperature according to the elapse of the heat retention time.
The temperature can be raised gradually. In other words, if there is no risk of spoilage immediately after cooking rice, set the insulation.
Lower the temperature and keep it warm at a low temperature where a good heat retention state is obtained.
If there is a risk of rot, it can be kept at a higher temperature than the above set temperature.
As a result, power consumption can be saved, and it is hardly rotted and browning hardly occurs.
It has an excellent effect of keeping rice warm.       [0024]     【Example】   Hereinafter, some preferred embodiments of the present invention will be described with reference to the accompanying drawings.       [0025]   Example 1   FIGS. 1 to 3 show an electric rice cooker according to a first embodiment of the present invention.
.       [0026]   As shown in FIG. 1, the electric rice cooker according to the present embodiment has both the function of cooking rice and the function of keeping heat.
And a bottomed cylindrical container body configured so that the rice cooker 6 can be set therein.
1 and a lid unit 7 for covering the upper part of the container body 1.       [0027]   The container body 1 includes a cylindrical outer case 2 formed of a thin metal plate,
2 and a synthetic resin shoulder member 4 and a bottom member 3 respectively connected to the upper and lower ends.
The rice cooker 6 is set inside so as to be able to be taken out.
A bottomed cylindrical inner container 5 is provided.       [0028]   In the center of the bottom of the inner container 5, a center sensor 28 that contacts the bottom of the rice cooker 6 is provided.
An annular rice cooker H is provided so as to surround the center sensor 28.₁But
It is arranged so as to be buried in the hot platen 24. The center sensor 28
A temperature-sensitive element (described later) that acts as a temperature detecting means for detecting the temperature of the rice cooker 6
And a rice set sensor (described later) for detecting whether or not the rice 6 is set, etc.
Is built-in.       [0029]   The lid unit 7 includes an outer cover 8 made of a synthetic resin forming an outer peripheral surface, and an inner peripheral surface.
The inner cover 9 made of synthetic resin constitutes a hollow structure.
-8 and the inner cover 9 are joined with good airtightness by high frequency welding or the like. This
Of the shoulder member 4 is rotated by a hinge mechanism 20 with respect to one side of the shoulder member 4.
At its open end, engages with a predetermined position of the lid unit 7.
A lock mechanism 21 for keeping the lid unit 7 closed is provided.       [0030]   In addition, a steam outlet 15 is provided at a substantially central portion of the lid unit 7,
At the lower part of the steam discharge port 15, a steam discharge cylinder mounting hole 13 is formed. The steam
In the discharge cylinder mounting hole 13, a rubber vapor discharge cylinder packing 14 is mounted.
.       [0031]   Further, below the lid unit 7, an upper opening of the rice cooker 6 is closed.
An inner lid 10 is provided, and a central portion of the inner lid 10 is formed at an appropriate position of the inner lid 10.
The steam guided to the internal space 16 above the inner lid 10 through the formed steam port 17 is removed.
A steam discharge cylinder 12 having a built-in pressure regulating device 11 for escape to a part is fixed. This
Of the steam discharge cylinder 12 is detachably attached to the packing 14 of the steam discharge cylinder.
It is attached. That is, the inner lid 10 is connected to the lid unit via the steam discharge cylinder 12.
7 is detachably attached. The lid unit 7 and the inner lid 10
Is sealed by a packing 18 attached to the peripheral portion of the inner cover 9.
This prevents the steam from leaking outside from portions other than the pressure regulating device 11.       [0032]   A heat insulating heater H is provided on the outer peripheral side of the inner container 5._TwoIs disposed on the shoulder member 4.
And a shoulder heater H is provided at a portion where the inner lid 10 is joined._ThreeAre arranged. Said security
Heater H_TwoIs mainly used to keep cooked rice warm and prevent rot,
The shoulder heater H_ThreeHeats the inner lid 10 by heat conduction and removes water droplets generated on its surface.
It is used to evaporate and prevent water drops from falling into the rice cooker 6.       [0033]   On the other hand, between the outer case 2 and the inner container 5, a rice cooker H₁, Heating heater H_Two
And shoulder heater H_ThreeMicrocomputer 23 for controlling power supply to
I have. The shoulder member 4 is provided with an operation board 22 constituting an operation section.
You.       [0034]   As shown in FIG. 2, the operation board 22 has white rice cooked, fast cooked cooked, cooked cooked rice.
Rice and rice cooker for selecting four rice cooking functions (in other words, rice cooking menu)
A menu switch 31; a reheating switch 32 operated at the time of reheating;
It is operated when starting and when canceling various operations (that is, one ON operation).
Insulation starts warming, and another operation cancels various operations.
Performed) Insulation / cancel switch 33 and rice cooker start to start rice cooker
A switch 34, a reservation switch 35 for timer reservation of rice cooking start time,
Lights when the rice cooker start switch 34 is turned on to indicate that it is in the rice cooker state.
Lights when the rice cooker indicator light 36 and the heat insulation / cancel switch 33 are turned on once.
Turning on of the reservation switch 35 and the heat retention indicator light 37 for displaying that it is in the heat retention state
A reservation indicator light 38 illuminated at the time to indicate that the apparatus is in a reserved state;
A reheating indicator light 40 which lights up when the switch is turned on to indicate a reheating state,
-The type of rice cooking menu selected by the switch 31 is displayed and visually recognized by the user.
LCD 39, clock set switch 49, and time adjustment
Time switch 50, the minute switch 51 to be operated at the time setting, and
A heat retention timer switch 56 for setting a meal time in the
A heat retention timer switch indicator light 57 which is turned on when the switch 56 is operated is provided. ing.       [0035]   On the liquid crystal display section 39, "white rice cooking" and "fast cooking" are operated by the menu switch 31.
A liquid crystal display that displays this when you select "Kikiniku", "Rice-cooked rice", or "Okowa-cooked rice"
Devices (hereinafter abbreviated as LCDs) 41 to 44 are provided. Note that, in this embodiment,
In this case, every time the menu switch 31 is turned on, “rice cooked rice”, “cooked rice cooked quickly”, “cooked cooked rice”
The loop of LCD 41-44 for "rice" and "rice cooked rice" will be selected in order.
I have. The liquid crystal display 39 also displays a clock.       [0036]   Next, based on the electric circuit diagram shown in FIG.
The configuration of a typical control unit will be described. It should be noted that FIG.
The components corresponding to the components described above are denoted by the same reference numerals.       [0037]   In FIG. 3, reference numeral 48 denotes a commercial AC power supply, and the power from the commercial AC power supply 48 is
, Rice cooker H₁, Heating heater H_TwoAnd shoulder heater H_ThreeAs well as
The power is also supplied to the microcomputer 23 as its power. Symbol 52 is
It is built in the center sensor 28 and operates as temperature detecting means for detecting the temperature of the rice cooker 6.
The temperature sensing element (for example, thermistor) to be used, and 53 indicates whether or not the rice cooker 6 is set.
Rice cooker set sensor that detects whether or not, 54 is a temperature fuse, 55 is the elapsed time after the start of heat retention
It is a timer that counts time.       [0038]   The microcomputer 23 includes a clock from a reference frequency generation circuit (not shown).
It operates according to a predetermined program based on the cook signal, and as shown in FIG.
Set the warming temperature lower than the normal warming temperature according to the lapse of the warming time from the end.
A set temperature-maintaining temperature changing means 231 for changing and setting the temperature to be higher than
The temperature of the rice cooker is maintained at the set temperature maintained by the temperature determining means 231.
Heater H_TwoPower supply control means 232 for controlling power supply to the
3 related to the elapse of the heat retention time at the time of one ON operation (that is, at the time of heat retention start)
And a fixed warming temperature setting means 233 for setting the warming temperature to a constant value, and a warming time Alarm means 234 for warning the user when the time has exceeded a predetermined time;
When the meal time is set by the immersion switch 56, the set warming temperature changing means is used.
231 so that the set warming temperature becomes the upper limit after the set time has elapsed.
Command means 235 for instructing to change the temperature and temperature.
Have been.       [0039]   The setting for changing the set warming temperature by the set warming temperature changing means 231 is the end of rice cooking.
Immediately after time t₁Until (for example, 8 hours) elapses, the normal warming temperature (for example,
Set temperature Ts which is lower than around 72 ° C)₁(Eg, 65 ° C)
Immediately after time t_Two(Eg, 12 hours) until the set temperature Ts_Two(For example,
, 68 ° C), time t immediately after cooking_Three(For example, 16 hours)
Set temperature Ts_Three(For example, 71 ° C.) and the time t immediately after the completion of rice cooking._ThreeIs set after
Constant temperature Ts_Four(For example, 74 ° C.)
Done       [0040]   In addition, the heat retention temperature set by the fixed heat retention temperature setting means 233 is the highest
Constant warming temperature Ts_FourIt is said.       [0041]   Further, the warning by the warning means 234 is performed by the blinking of the heat retention indicator light 37,
In the case of this embodiment, the heat retention time t_ThreeAfter the lapse of time, the heat indicator 37 is set to the first blinking interval Δt.₁(
(For example, every 1 second)_Four(For example, 20 hours)
The temperature indicator 37 is set to the first blinking interval Δt.₁Shorter second blink interval Δt_Two(For example,
, At 0.5 second intervals).       [0042]   Further, the command means 235 is provided to the set warming temperature changing means 231.
Elapsed heat retention time t₁, T_Two, T_ThreeThe reservation setting time by the heat retention timer switch 56
t corresponding to ts₁', T_Two', T_Three′. For example, t
When s = 8 hours, t₁'= 4 hours, t_Two'= 2 hours, t_Three'= 2 hours.       [0043]   Next, the contents of the heat retention control by the microcomputer 23 will be described with reference to FIGS.
This will be described with reference to the flowchart shown in FIG.       [0044]   As shown in FIG.₁The rice cooker start switch 34 is turned on
A determination is made as to whether or not an affirmative determination has been made._TwoCooked rice in
The indicator light 36 is turned on and the rice cooker H₁Is performed, and step S is performed._ThreeTo
It is determined whether cooking is finished. Step S₁Negative decision at
If so, step S_FourWhether the heat retention switch 33 is turned on
The determination is made. If the determination is affirmative, the fixed warming temperature setting means 233 described later
More set temperature setting Ts_Four= 73 ° C is executed.
Step S_FourIf a negative determination is made in step S₁Return to
.       [0045]   And step S_ThreeIf an affirmative determination is made in
Since the heat retention has been started at step S_FiveInsulation indicator light 37
Is lit. Then, step S₆Operation of the heat retention timer switch 56
It is determined whether or not the determination has been made, and an affirmative determination (that is, the warming timer switch 56 → O
If N), step S₇And set the meal time reservation (in other words, the time
Set) is made and step S₈As described above, the heat retention elapsed time t₁, T_Two
, T_ThreeIs t by a command from the command means 235₁', T_Two', T_Three'
Later, step S₉To step S₆Is negative (that is, the insulation tie
If the switch 56 is OFF), go directly to step S₉Proceed to timer 55
The count starts.       [0046]   Then, step S_Ten~ Step S₁₃In the warming time t by the timer 55
Is monitored, and step S₁₃At t <t₁= 8 hours (
When the heat retention timer switch 56 is ON, t <t₁') Includes step S_1
FourAt a time, temperature information T from the temperature sensing element 52 of the center sensor 28 is inputted, and
Top S₁₅At the set warming temperature Ts at that time₁= 65 ° C. and T> Ts₁Step S while = 65 ° C₁₆Insulation heater H_TwoIs OFF
Is done. And step S₁₅At T ≦ Ts₁= 65 ° C
Top S₁₇Insulation heater H_TwoIs turned on, and the heat retention is executed. In other words, rice cooking
Immediately after the warming time t₁(When the heat retention timer switch 56 is ON,
Interval t₁') Until the set heat retention temperature Ts₁= Insulation controlled by 65 ° C
And immediately after the end of rice cooking, the heater H_TwoIs not turned on, rice cooker temperature
Is the set insulation temperature Ts₁= Heat insulation heater H after falling to 65 ° C_TwoON / OFF
Thus, the heat retention control is performed (see FIG. 7).       [0047]   Step S₁₃At t ≧ t₁= 8 hours (when the heat retention timer switch 56 is ON)
, T ≧ t₁'), Step S₁₈At the center
The temperature information T from the temperature sensing element 52 of the sensor 28 is input, and step S₁₉At
Set warming temperature Ts at that time_Two= 68 ° C., and T ≦ Ts_Two= 68 ° C
Step S while₁₇Insulation heater H_TwoIs turned on and step S₁₉To
Where T> Ts_Two= 68 ° C., Step S₁₆Insulation heater H_TwoBut
The heat retention control that is turned off is executed. The above control is performed in step S₁₂At
t ≧ t_Two= 12 hours (when the heat retention timer switch 56 is ON, t ≧ t_Two′
). In other words, immediately after cooking rice, the warming time t₁(Warm timer
When the switch 56 is ON, the warming time t₁') Has elapsed and the heat retention time t_Two
= 12 hours (when the heat retention timer switch 56 is ON, the heat retention time t_Two′)
Until elapse, the set warming temperature Ts_Two= Insulation controlled by 68 ° C
(See FIG. 7).       [0048]   Step S₁₂At t ≧ t_Two= 12 hours (ON of the heat retention timer switch 56)
At times, t ≧ t_Two'), Step S₂₀In Sen
Temperature information T from the temperature sensing element 52 of the_{twenty one}smell
Set warming temperature Ts at that time_Three= 71 ° C. and T ≦ Ts_Three= 71 ° C
Step S while it is₁₇Insulation heater H_TwoIs turned on and step S_{twenty one}
At T> Ts_Three= 71 ° C, step S₁₆Insulation heater H_Two Is turned off, the heat retention control is executed. The above control is performed in step S₁₁smell
T ≧ t_Three= 16 hours (when the heat retention timer switch 56 is ON, t ≧ t_Three
') Until it is determined. In other words, immediately after cooking rice, the warming time t_Two(Insulation Thailand
When the switch 56 is ON, the warming time t_Two′) After the heat retention time
t_Three= 16 hours (when the heat retention timer switch 56 is ON, the heat retention time t_Two′
) Until the set warming temperature Ts_Three= 71 ° C will be controlled
(See FIG. 7).       [0049]   Step S₁₁At t ≧ t_Three= 16 hours (ON of heat retention timer switch 56)
At times, t ≧ t_Three'), Step S_{twenty two}Alarm at
The warning by the means 234 (that is, the first blinking interval Δt of the heat retaining indicator 37)₁Flashing on
) Is performed, and step S_{twenty three}At the temperature from the temperature sensing element 52 of the center sensor 28
Information T is input, and step S_{twenty four}At the set warming temperature Ts at that time_Four= 74 ° C
And T ≦ Ts_Four= 74 ° C while step S₁₇At
Heating heater H_TwoIs turned on and step S_{twenty four}At T> Ts_Four= 74 ° C
Then step S₁₆Insulation heater H_TwoIs turned off and the heat retention control is executed
. The above control is continued thereafter. In other words, immediately after cooking rice, the warming time t_Three= 1
6 hours (when the warming timer switch 56 is ON, the warming time t_Three')
After passing, set warming temperature Ts_Four= 74 ° C.
7).       [0050]   Step S_TenAt t ≧ t_Four= 20 hours, step S_Two
FiveAt the warning by the warning means 234 (that is, the second blinking interval of the heat retention indicator 37).
Δt_TwoFlashing), and then step S_{twenty three}And the subsequent processing is performed
You.       [0051]   Then, step S₂₆When the cancel switch 33 is turned ON in
S₂₇The timer 55 is reset at step S₂₈Insulation indicator light in
37 is turned off and the process returns to the initial mode. Step S₂₆Canceled at Until the switch 33 is turned on, the above-described heat retention control is continued.       [0052]   By the way, step S_FourIf a positive determination is made in (in other words, the heat retention switch
When the switch 33 is turned on), as shown in FIG.₂₉smell
The warming indicator light 37 is turned on, and step S₃₀In the count of the timer 55
Start, step S₃₁At the temperature sensor 52 from the temperature sensor 52 of the center sensor 28.
After the information T has been input, step S₃₂In the fixed heat retention temperature setting means 233
Preset heat retention temperature Ts fixedly set_Five= 73 ° C. and T <Ts_Five= 73
Step S while the temperature is ℃₃₃Insulation heater H_TwoIs turned on and the step
S₃₂At T ≧ Ts_Five= 73 ° C, step S₃₄Heat insulation in
TA H_TwoIs turned off, the heat retention control is executed. In other words, immediately after cooking
Irrespective of the fixed set temperature Ts_Five= 73 ° C.
7). During such continuation of the heat retention control, step S₃₅And steps
S₃₆In step S, the elapse of the heat retention time t is monitored, and₃₆At t ≧ t_Three= 1
If it is determined to be six hours, step S₃₇In the warning by the warning means 234
(That is, the first blinking interval Δt of the heat retaining indicator 37)₁Flashing on) and step
S₃₅At t ≧ t_Four= 20 hours, step S₃₈At
The warning by the warning means 234 (that is, the second blinking interval Δt of the heat retaining indicator 37)_TwoAt
Flashing). Step S₃₆If a negative judgment is made in (in other words,
(If not keeping warm for a long time)₂₉Return to       [0053]   Then, step S₃₉When the cancel switch 33 is turned ON in
S₄₀The timer 55 is reset at step S₄₁Insulation indicator light in
37 is turned off and the process returns to the initial mode. Step S₃₉Canceled at
Until the switch 33 is turned on, the above-mentioned fixed set insulation temperature Ts is set._FiveBy
Insulation control is continued.       [0054]   As described above, according to the present embodiment, the response to the elapse of the heat retention time t from the end of rice cooking is as follows.
The set insulation temperature Ts is changed and set so as to be higher than the normal insulation temperature. Insulation temperature Ts changed and set₁~ Ts_FourTo keep the rice cooker temperature T
TA H_TwoPower supply is controlled so that when cooking rice ends (that is, when
(Point) set insulation temperature Ts₁Is set low, the rice cooker temperature T is set from the end of rice cooking.
Constant warming temperature Ts₁Until the temperature drops to_TwoCan be turned off
The heat retention temperature can be gradually increased as the heat retention time t elapses.
Otherwise, heat is kept at a low temperature where a good heat retention state is obtained, and the heat retention time t becomes longer.
Can be kept at a high temperature when there is a risk of rot)
In addition to saving money, it can keep rice warm and hard to rot and hardly brown
.       [0055]   In addition, the change setting of the set heat retention temperature Ts is changed after the initial heat retention elapsed time (t₁Or t₁
′) In a stepwise manner (ie, according to the elapse of the constant heat retention time t (ie, four hours))
(In 3 ° C increments), so that the setting of the set warming temperature Ts can be changed.
The change setting of the set warming temperature Ts can be performed while reducing the number of processing steps.       [0056]   In addition, the set warming temperature Ts to be changed is set to the upper limit value Ts._Four= 74 ℃
As a result, the heat retention temperature became too high and the rice deteriorated (in other words, browning
) Can be prevented.       [0057]   Also, when the heat insulation switch 33 is turned on, regardless of the elapse of the heat insulation time t,
Keeping the insulation temperature at a constant value Ts_Five= 73 ° C, so that only heat retention
Good heat insulation when performing (heat insulation without browning while preventing rot)
Is obtained.       [0058]   In addition, when the heat retention timer switch 56 is turned on (that is, the reservation setting of the meal time is performed).
Is performed), after the elapse of the reservation setting time, the set heat retention temperature Ts is increased to the upper limit value Ts._Four
By changing the set warming temperature so that it becomes
Can get hot rice automatically.       [0059]   Moreover, the warming time t is equal to the predetermined time t._Three= 16 hours and t_Four= More than 20 hours
If the rice is kept warm for a long time, the quality of rice (in other words, browning)
By giving a two-step warning, you can appeal to avoid long-term heat retention.       [0060]   Example 2   In the case of the present embodiment, the set temperature Ts by the set temperature changing means 231 is proportionally higher.
And the one-hour timer is used as the timer 55.
Only the difference from the first embodiment is that the other configuration is the same as that of the first embodiment.
The explanation is omitted and avoided.       [0061]   Next, with reference to the flowchart shown in FIG.
The heat retention control by the microcomputer will be described in detail.       [0062]   Step S₁Is determined whether the rice cooker start switch 34 is turned on or not.
If the determination is affirmative, step S_TwoThe rice cooker lamp 36 lights up at
And rice cooker H₁Is performed, and step S is performed._ThreeWhether cooking is finished in
Is determined. Step S₁If a negative determination is made in
Tep S_FourIt is determined whether or not the heat retention switch 33 has been turned on in
If it is determined, the temperature is fixedly set by the fixed heat retaining temperature setting unit 233 described later.
Set insulation temperature Ts_Four= 73 ° C is executed. Step S_FourTo
If a negative determination is made in step S₁Return to       [0063]   And step S_ThreeIf a positive determination is made in step S_FiveAt
The temperature indicator light 37 is turned on, and step S₆In the warming timer switch 56 is O
It is determined whether or not N operations have been performed, and if a negative determination is made, step S₇In
ΔT = 0.5, and if an affirmative determination is made, step S₈Meals at
Time reservation setting (in other words, time setting) is performed, and step S₉At Δ
T is a value ΔT ′ [e.g., ΔT ′ determined by the difference ts between the reservation start time and the reservation time.
T ′ = 0.5 × (16 / ts)} is set. Here, ΔT is the set warming temperature This shows a coefficient for calculating a temperature coefficient β (described later) in the case of changing and setting.       [0064]   Next, step S_TenStarts counting by the timer 55 in step S
₁₁~ Step S₁₄In step S55, the timer 55 counts up (step S₁₁)Every
The timer 55 is reset (in other words, every one hour) (step S₁₂),
Rewriting of time coefficient α (step S₁₃) And the calculation of the temperature coefficient β (step S₁₄
) Is implemented. That is, α: α + 1 is set every hour, and β = ΔT × α (heat insulation
When the timer switch 56 is ON, β = ΔT ′ × α). here
, Α is an integer of 0 to 15.       [0065]   And step S₁₁Judges that the timer 55 has not counted up
If it is determined (that is, if it is determined that one hour has not elapsed),
Top S₁₅, Temperature information T from the temperature sensing element 52 of the center sensor 28 is input.
, Step S₁₆In comparison with the set warming temperature Ts = 65 + β ° C at that time,
Step S while T> Ts holds₁₇Insulation heater H_TwoIs OFF
Is done. And step S₁₆If it is determined in step S that T ≦ Ts, step S₁₈To
Insulation heater H_TwoIs turned on, and the heat retention is executed. In other words, right after cooking rice
Until one hour elapses, when the rice cooker temperature T drops to 65 ° C., the heat retaining heater H_Two
Is turned on, and then the rice cooker temperature T is kept at the set temperature Ts = 65 ° C.
It is controlled, and after 2 hours have passed since the end of rice cooking, the set warmth is kept every 1 hour
The degree Ts is ΔT ° C. = 0.5 ° C. (When the heat retention timer switch 56 is ON, ΔT
T '° C) The temperature is set to a higher value in increments, and the rice cooker temperature T is
Such heat retention control is continued. In the case of this embodiment, the set temperature
The upper limit value Tsmax of the degree Ts is 73 ° C., where α = 16 and β = 16ΔT.
After that, the heat retention is controlled at the set heat retention temperature of 73 ° C.       [0066]   On the other hand, step S_FourIf a positive determination is made in (in other words, the heat retention switch
33 is turned ON), step S₁₉Insulation indicator light 37 lights up at
And step S₂₀Is reset to β = 8 in step S₁₅Back to The same heat retention control as described above is executed, but the set heat retention temperature Ts at this time is 65+
8 = fixed to 73 ° C.       [0067]   During the continuation of the heat retention control as described above, step S_{twenty one}Accumulation of heat retention time t
An operation is performed, and step S_{twenty two}And step S_{twenty three}Monitoring the elapse of the heat retention time t
And step S_{twenty three}At t ≧ t_Five= 15 hours, step S_{twenty four}
At the warning means (that is, the first blinking interval Δt of the heat retaining indicator 37).₁so
Flashes), and step S_{twenty two}At t ≧ t₆(= 20 hours)
If so, step S_{twenty five}At the warning by the warning means (that is,
Second blink interval Δt_TwoFlashing).       [0068]   Then, step S₂₆When the cancel switch 33 is turned ON in
S₂₇Are reset at step S₂₈Timer 55 is reset
Set, step S₂₉At this time, the heat indicator 37 is turned off and the system returns to the initial mode.
Turn. Step S₂₆Until the cancel switch 33 is turned on.
During this period, the above-described heat retention control is continued (see FIG. 9).       [0069]   As described above, according to the present embodiment, the change setting of the set warming temperature Ts is kept constant.
Depending on the lapse of the warming time t (ie, 1 hour) (ie, 0.5 ° C. or ΔT ′)
(In increments of ° C), the change setting of the set warming temperature Ts
As shown in FIG. 8, it can be performed almost proportionally with the elapse of the heat retention time t,
Insulation control can be performed by finely changing the set insulation temperature. Note that the heat retention time t
If the size is reduced and the temperature is reduced, the setting of the set heat retention temperature Ts can be changed.
Can be performed more proportionally. Other effects are the same as those of the first embodiment.
Therefore, description is omitted to avoid duplication.       [0070]   Example 3   In the case of the present embodiment, in the case of the reservation setting by the heat retention timer switch 56,
The set warming temperature is changed from a time that is a predetermined time before the reservation setting time. However, only the difference from the first embodiment is the same as in the first embodiment.
Description is omitted.       [0071]   Next, a third embodiment will be described with reference to flowcharts shown in FIGS.
The heat retention control by the microcomputer in the electric rice cooker will be described in detail.       [0072]   As shown in FIG.₁Rice cook start switch 34 is ON
It is determined whether or not the determination has been made. If the determination is affirmative, step S_TwoCooking in
The rice indicator light 36 is turned on and the rice cooker H₁Is performed, and step S is performed._Three
It is determined whether cooking is finished or not. Step S₁Negation in
If set, step S_FourWhether the heat retention switch 33 is turned on
Is determined, and if a positive determination is made, step S_FiveIn "normal warming"
The determination is made as to whether or not the determination is affirmative (that is, in the case of “normal heat retention”), which will be described later.
The set insulation temperature Ts fixedly set by the fixed insulation temperature setting means 233_Four= 73
The heat retention control by ° C. is executed (see FIG. 11). Step S_FourNo in
Step S if the determination is fixed₁Return to       [0073]   And step S_ThreeIf a positive determination is made in step S_FiveAt
If a negative determination is made, the rice cooker is finished and the heat retention is started at the same time.
And when the heat insulation switch 33 is ON and is not in the “normal heat insulation” state (that is,
Step S)₆, The warming indicator light 37 is turned on. This
Here, “low temperature insulation” means that the set insulation temperature Ts is set to a low temperature according to the elapse of the insulation time t.
Temperature control to change the temperature to a higher temperature. Then, step S₇Insulation timer
A determination is made as to whether the switch 56 has been turned ON, and an affirmative determination (ie,
In the case of the immersion switch 56 → ON), the heat retention control described later is executed (FIG. 12).
Step S)₇Is negative (that is, the warming timer switch 5
6 → OFF), step S₈And the timer 55 starts counting.
You.       [0074]   Then, step S₉~ Step S₁₂In the warming time t by the timer 55
Is monitored, and step S₁₂At t <t₁= 8 hours
Is the step S₁₃, The temperature information T from the temperature sensing element 52 of the center sensor 28 is
Input and step S₁₄At the set warming temperature Ts at that time₁= Comparison with 65 ° C
And T> Ts₁Step S while = 65 ° C₁₅Heat insulation in
TA H_TwoIs set to OFF. And step S₁₄At T ≦ Ts₁= 65 ° C
If set, step S₁₆Insulation heater H_TwoIs turned on and the heat retention is executed
. In other words, immediately after cooking rice, the warming time t₁Until elapse, the set warming temperature Ts₁= 65
The temperature is controlled by the temperature control, and immediately after the rice cooking is completed, the heat retaining heater H is set._TwoIs ON
The temperature of the rice cooker is not₁= 65 ° C
Heater H_TwoThe heat insulation control is performed by turning ON / OFF the power supply (see FIG. 7).
reference).       [0075]   Step S₁₂At t ≧ t₁= 8 hours, step S₁₇
At a time, temperature information T from the temperature sensing element 52 of the center sensor 28 is input, and the
S₁₈At the set warming temperature Ts at that time_Two= 68 ° C., and T ≦ T
s_Two= 68 ° C while step S₁₆Insulation heater H_TwoIs turned on,
Step S₁₈At T> Ts_Two= 68 ° C., Step S₁₅At
Heating heater H_TwoIs turned off, the heat retention control is executed. Note that the above control
Top S₁₁At t ≧ t_Two= 12 hours. In other words, rice cooking
Immediately after the warming time t₁After the elapse of the heat retention time t_Two= Set until 12 hours elapse
Insulation temperature Ts_Two= 68 ° C (see Fig. 7).       [0076]   Step S₁₁At t ≧ t_Two= 12 hours, step S_1
9At a time, temperature information T from the temperature sensing element 52 of the center sensor 28 is inputted, and
Top S₂₀At the set warming temperature Ts at that time_Three= 71 ° C., and T ≦
Ts_Three= 71 ° C while step S₁₆Insulation heater H_TwoIs turned on
, Step S₂₀At T> Ts_Three= 71 ° C, step S₁₅smell
Insulation heater H_TwoIs turned off, the heat retention control is executed. Note that the above control Tep S_TenAt t ≧ t_Three= 16 hours. In other words, cooking
Warm-up time t right after the meal_TwoAfter the elapse of the heat retention time t_Three= Set until 16 hours have elapsed
Constant warming temperature Ts_Three= 71 ° C (see Fig. 7).       [0077]   Step S_TenAt t ≧ t_Three= 16 hours, step S_Two
1At the warning by the warning means 234 (that is, the first blinking interval of the heat-retention indicator 37).
Δt₁At step S)._{twenty two}In the temperature sensor of the center sensor 28
52, the temperature information T is input from step S52._{twenty three}Insulation temperature set at that time
Ts_Four= 74 ° C., and T ≦ Ts_FourStep while the temperature is 74 ° C
S₁₈Insulation heater H_TwoIs turned on and step S_{twenty three}At T> Ts_Four= 74
Step S₁₅Insulation heater H_TwoInsulation control that turns off
Is executed. The above control is continued thereafter. In other words, keep warm immediately after cooking
Time t_Three= After 16 hours have passed, the set warming temperature Ts_Four= Insulation control by 74 ° C
(See FIG. 7).       [0078]   Step S₉At t ≧ t_Four= 20 hours, step S_{twenty four}
At the warning means 234 (that is, the second blinking interval Δ
t_TwoFlashing), and then step S_{twenty two}Proceed to and the subsequent processing is performed
. Then, step S_{twenty five}When the cancel switch 33 is turned ON in
Top S₂₆The timer 55 is reset at step S₂₇Insulation display at
The light 37 is turned off and the process returns to the initial mode. Step S₂₅₄At
The above-described heat retention control is continued until the cancel switch 33 is turned on.       [0079]   By the way, step S_FiveIf an affirmative decision is made in (in other words,
In the case of “temperature”), as shown in FIG.₂₈Insulation indicator light 37 in
Is lit, and step S₂₉The timer 55 starts counting at
S₃₀, The temperature information T from the temperature sensing element 52 of the center sensor 28 was input.
Later, step S₃₁In the setting which is fixedly set by the fixed heat retention temperature setting means 233,
Constant warming temperature Ts_Five= 73 ° C. and T <Ts_Five= 73 ° C Is Step S₃₂Insulation heater H_TwoIs turned on and step S₃₃At T ≧
Ts_Five= 73 ° C, step S₃₇Insulation heater H_TwoIs turned off
Is performed. In other words, immediately after cooking, the fixed setting is maintained regardless of the warming time.
Temperature Ts_Five= 73 ° C. Such a heat retention control
During the continuation, step S₃₄And step S₃₅In elapse of heat retention time t
Monitored, step S₃₅At t ≧ t_Three= 16 hours
Tep S₃₆At the warning by the warning means 234 (that is, the first
Flashing interval Δt₁At step S).₃₄At t ≧ t_Four= 20 hours
If determined, step S₃₇In the warning by the warning means 234 (that is,
Second blinking interval Δt of heat retention indicator 37_TwoFlashing). Note that step
S₃₅If a negative determination is made (in other words, if the temperature is not kept for a long time),
Tep S₂₈Return to       [0080]   Then, step S₃₈When the cancel switch 33 is turned ON in
S₃₉The timer 55 is reset at step S₄₀Insulation indicator light in
37 is turned off and the process returns to the initial mode. Step S₃₈Canceled at
Until the switch 33 is turned on, the above-described heat retention control (that is, the fixed setting retention) is performed.
Temperature Ts_FiveThe normal warming control based on the above is continued.       [0081]   On the other hand, step S₇If a positive determination is made in (in other words, the heat retention timer
When the switch 56 is turned ON), as shown in FIG.₄₁
To make a reservation setting of meal time (in other words, time setting), and
₄₂It is confirmed that 20 seconds have elapsed. The lapse of the time indicates completion of the time set.
It is provided for confirmation. Then, step S₄₃At the reservation set time t
The difference between m and the current time tn is monitored, and when the difference between them becomes a predetermined time ta = 30 minutes.
(That is, tm−tn ≦ ta), step S₄₄At the temperature sensor of the center sensor 28
After the temperature information T is input from the slave 52, the process proceeds to step S₄₅The highest setting warmth in
The degree Ta is compared with 73 ° C., and the step is performed while T ≦ Ta = 73 ° C.
S₄₆Insulation heater H_TwoIs turned on and step S₄₅Where T> Ta = 73 Step S₄₇Insulation heater H_TwoInsulation control that turns off
Is executed, and step S₄₃Is negative in (in other words, tm−t
n> ta), step S₄₈At the temperature sensor 52 of the center sensor 28
After the temperature information T is input from the₄₉Low temperature setting temperature Tb
= 65 ° C, and while T ≦ Tb = 65 ° C, step S₅₀To
Insulation heater H_TwoIs turned on and step S₄₉T> Tb = 65 ° C
If set, step S₅₁Insulation heater H_TwoIs turned off and heat retention control is executed.
Is done. In other words, when a meal time reservation is set, the reservation setting time
Insulation at low temperature setting insulation temperature Tb = 65 ° C. until a predetermined time ta = 30 minutes before tm
The control is executed, and the maximum setting is made for a predetermined time ta = 30 minutes before the reservation setting time tm.
The heat retention control at the heat retention temperature Ta is executed (see FIG. 13).       [0082]   Then, step S₅₂When the cancel switch 33 is turned ON in
S₅₃Is stored in step S,₂₆(See FIG. 10)
, The same processing as described above is performed. On the other hand, step S₅₂Was judged negative
In this case (that is, when the cancel switch 33 has not been turned ON), step S₅₄To
Proceeds, it is determined whether or not the rice cooker 6 is set, and when a positive determination is made (
That is, if the rice cooker 6 is set), the process proceeds to step S.₄₃And the same as above
Such processing is performed. Step S₅₄Is negative (ie, the rice cooker 6)
Is not set), step S₅₅To determine if 2 seconds have passed
Is set, and a positive determination is made (that is, the state in which the rice cooker 6 is not set is less than 2 seconds)
Step S)₅₃And the "normal heat retention" is stored. Note that
, Step S₅₅If a negative determination is made in step S₄₃Return to       [0083]   As described above, according to this embodiment, when the reservation setting of the meal time is performed,
In other words, until the predetermined time ta = 30 minutes before the reservation set time tm, the low-temperature set heat retention temperature
The heat retention control at Tb = 65 ° C. is performed, and the predetermined time ta = 3 from the reservation set time tm.
From 0 minutes before, the heat retention control at the maximum set heat retention temperature Ta is to be executed.
Therefore, at the reservation setting time tm, the hot apple kept warm at the maximum set warming temperature Ta You can get rice.       [0084]   In the case of the present embodiment, when the cancel switch 33 is turned on or when the rice cooker 6 is reset.
In normal operation, "normal heat retention" is to be given priority,
Good for various usage patterns (that is, when a normal usage pattern is not taken)
Good heat insulation (that is, a fixed set heat insulation temperature Ts)_FiveHeat control by heat control based on
Can be       [0085]   Other functions and effects are the same as those of the first embodiment, and thus the description will be omitted to avoid duplication.       [0086]   Example 4   FIGS. 14 to 18 show the operation of the electric rice cooker according to the fourth embodiment of the present invention.
The construction and flowchart of the operation base, electric circuit and microcomputer are shown.
Have been.       [0087]   In the case of this embodiment, the heat retention / cancel switch 33 set in the first embodiment is
The heat insulation switch 33 and the cancel switch 58 are set independently of each other.
The change setting of the set heat retaining temperature Ts by the constant heat retaining temperature changing means 231 and the fixed heat retaining temperature.
Selection means for selecting the fixed temperature setting Ts by the temperature setting means 233.
And a selection switch 59 that operates. Reference numeral 60 denotes an operation of the selection switch 59.
It is a selection switch indicator light that lights up during operation. Other configurations are the same as in the first embodiment.
The description is omitted to avoid duplication.       [0088]   Next, with reference to the flowcharts shown in FIGS.
The heat retention control by the microcomputer will be described in detail.       [0089]   In the case of the present embodiment, the set warming temperature change unit 231 changes the set warming temperature Ts.
Setting (hereinafter referred to as “low temperature insulation”) and the setting and maintenance by the fixed insulation temperature setting means 233.
The fixed setting of the temperature Ts (hereinafter referred to as “normal heat retention”) is selected. Therefore, as shown in FIG.₁Memory of "normal heat retention"
Previously, step S_Two~ Step S_FourIn rice cooker switch 34, heat retention switch 3
3 and the ON operation of the selection switch 59 is confirmed. Rice cook switch 34 and heat insulation
If the selection switch 59 is turned on without the switch being turned on, the switch is turned on.
Tep S_FiveIt is determined whether or not it is “normal heat retention” in
Is Step S₆To step S₁"Normal heat retention" stored in
Insulation is replaced with a negative judgment (that is, it is already "low temperature insulation"
Step S)₇"Low temperature insulation" replaced with "Normal insulation"
Can be In this process, “low temperature insulation” or “normal insulation” is performed according to the user's will.
Done to choose.       [0090]   When the rice cooker switch 34 is turned on, step S is performed.₈Cooking table in
Indicator light 36 is turned on and rice cooker H₁Is performed, and step S is performed.₉In
It is determined whether cooking is finished. And step S₉Affirmative decision
If the food is cooked, the rice is cooked and the heat retention is started at the same time.
Top S_Ten, The warming indicator light 37 is turned on. Then, step S₁₁At
It is determined whether or not the heat retention timer switch 56 has been turned ON, and an affirmative determination (
That is, in the case of the heat retention timer switch 56 → ON), step S₁₂Proceed to eat
Event time reservation setting (in other words, time setting) is performed, and step S₁₃At
Elapsed heat retention time t₁, T_Two, T_ThreeIs t by a command from the command means 235₁', T_Two′,
t_Three′, Then step S₁₄To step S₁₁Is determined by
If a negative determination is made (that is, the heat retention timer switch 56 is turned off), the process proceeds directly to step S
₁₄The timer 55 starts counting.       [0091]   Then, step S₁₅~ Step S₁₈In the warming time t by the timer 55
Is monitored, and step S₁₈At t <t₁= 8 hours
Is the step S₁₉, The temperature information T from the temperature sensing element 52 of the center sensor 28 is
Input and step S₂₀At the set warming temperature Ts at that time₁= Comparison with 65 ° C
And T> Ts₁Step S while = 65 ° C_{twenty one}Heat insulation in TA H_TwoIs set to OFF. And step S₂₀At T ≦ Ts₁= 65 ° C
If set, step S_{twenty two}Insulation heater H_TwoIs turned on and the heat retention is executed
. In other words, immediately after cooking rice, the warming time t₁Until elapse, the set warming temperature Ts₁= 65
The temperature is controlled by the temperature control, and immediately after the rice cooking is completed, the heat retaining heater H is set._TwoIs ON
The temperature of the rice cooker is not₁= 65 ° C
Heater H_TwoThe heat insulation control is performed by turning ON / OFF the power supply (see FIG. 7).
reference).       [0092]   Step S₁₈At t ≧ t₁= 8 hours, step S_{twenty three}
At a time, temperature information T from the temperature sensing element 52 of the center sensor 28 is input, and the
S_{twenty four}At the set warming temperature Ts at that time_Two= 68 ° C., and T ≦ T
s_Two= 68 ° C while step S_{twenty two}Insulation heater H_TwoIs turned on,
Step S_{twenty three}At T> Ts_Two= 68 ° C., Step S_{twenty one}At
Heating heater H_TwoIs turned off, the heat retention control is executed. Note that the above control
Top S₁₇At t ≧ t_Two= 12 hours. In other words, rice cooking
Immediately after the warming time t₁After the elapse of the heat retention time t_Two= Set until 12 hours elapse
Insulation temperature Ts_Two= 68 ° C (see Fig. 7).       [0093]   Step S₁₇At t ≧ t_Two= 12 hours, step S_Two
FiveAt a time, temperature information T from the temperature sensing element 52 of the center sensor 28 is inputted, and
Top S₂₆At the set warming temperature Ts at that time_Three= 71 ° C., and T ≦
Ts_Three= 71 ° C while step S_{twenty two}Insulation heater H_TwoIs turned on
, Step S₂₆At T> Ts_Three= 71 ° C, step S_{twenty one}smell
Insulation heater H_TwoIs turned off, the heat retention control is executed. Note that the above control
Tep S₁₆At t ≧ t_Three= 16 hours. In other words, cooking
Warm-up time t right after the meal_TwoAfter the elapse of the heat retention time t_Three= Set until 16 hours have elapsed
Constant warming temperature Ts_Three= 71 ° C (see Fig. 7).       [0094]   Step S₁₆At t ≧ t_Three= 16 hours, step S_{Two 7} At the warning by the warning means 234 (that is, the first blinking interval of the heat-retention indicator 37).
Δt₁At step S).₂₈In the temperature sensor of the center sensor 28
52, the temperature information T is input from step S52.₂₉Insulation temperature set at that time
Ts_Four= 74 ° C., and T ≦ Ts_FourStep while the temperature is 74 ° C
S_{twenty two}Insulation heater H_TwoIs turned on and step S₂₉At T> Ts_Four= 74
Step S_{twenty one}Insulation heater H_TwoInsulation control that turns off
Is executed. The above control is continued thereafter. In other words, keep warm immediately after cooking
Time t_Three= After 16 hours have passed, the set warming temperature Ts_Four= Insulation control by 74 ° C
(See FIG. 7).       [0095]   Step S₁₇At t ≧ t_Four= 20 hours, step S_Three
0At the warning by the warning means 234 (that is, the second blinking interval of the heat retention indicator 37).
Δt_TwoFlashing), and then step S₂₈And the subsequent processing is performed
You.       [0096]   Then, step S₃₁When the cancel switch 33 is turned ON in
S₃₂The timer 55 is reset at step S₃₃Insulation indicator light in
37 is turned off and the process returns to the initial mode. Step S₃₁Canceled at
Until the switch 33 is turned on, the above-described heat retention control is continued.       [0097]   By the way, step S_ThreeIf a positive determination is made in (in other words, the heat retention switch
Switch 33 is turned on) Step S₃₄To determine if it is "normal heat retention"
Is determined and a negative determination is made (in other words, "low temperature insulation" is specified
Step S)_Ten(Refer to FIG. 17).
Is performed.       [0098]   On the other hand, step S₃₄Is affirmatively determined (in other words, "normal heat retention"
"Is designated), as shown in FIG.₃₅Proceed to
The temperature indicator light 37 is turned on, and step S₃₆Starts counting by timer 55 And step S₃₇At the temperature information T from the temperature sensing element 52 of the center sensor 28
Is input, then step S₃₈Fixed by the fixed heat retention temperature setting means 233
Set heat retention temperature Ts_Five= 73 ° C. and T <Ts_Five= 73 ° C
Step S while it is₃₉Insulation heater H_TwoIs turned on and step S₃₈
At T ≧ Ts_Five= 73 ° C, step S₄₀Insulation heater H_Two
Is turned off, the heat retention control is executed. In other words, immediately after cooking,
Fixed set temperature Ts_Five= 73 ° C. like this
During the continuation of the warm insulation control, step S₄₁And step S₄₂At the time of warming
The progress of the interval t is monitored, and step S₄₂At t ≧ t_Three= Determined to be 16 hours
If so, step S₄₃At the warning by the warning means 234 (that is,
37 first blink interval Δt₁At step S).₄₁At t ≧ t_Four
= 20 hours, step S₄₄By the alarm means 234
The warning (that is, the second blinking interval Δt of the heat retaining indicator 37)_TwoFlashing). What
Contact, step S₄₂If a negative determination is made in (in other words, the heat is not kept for a long time)
Step S)₃₅Return to       [0099]   Then, step S₄₅When the cancel switch 33 is turned ON in
S₄₆Is stored in step S,₃₂(See FIG. 17)
, The same processing as described above is performed. On the other hand, step S₄₅Was judged negative
In this case (that is, when the cancel switch 33 has not been turned ON), step S₄₇To
Proceeds, it is determined whether or not the rice cooker 6 is set, and when a positive determination is made (
That is, if the rice cooker 6 is set), the process proceeds to step S.₃₇And the same as above
Such processing is performed. Step S₄₇Is negative (ie, the rice cooker 6)
Is not set), step S₄₈To determine if 2 seconds have passed
Is set, and a positive determination is made (that is, the state in which the rice cooker 6 is not set is less than 2 seconds)
Step S)₄₆And the "normal heat retention" is stored. Note that
, Step S₄₈If a negative determination is made in step S₃₇Return to       [0100]   In the case of the present embodiment, the selection switch 59 is turned ON by the user's will. More specifically, “selective heat insulation” by the set heat insulation temperature changing means 231 and fixed heat insulation temperature setting means
233 "normal heat retention" can be appropriately selected.       [0101]   In the case of the present embodiment, when the cancel switch 33 is turned on or when the rice cooker 6 is reset.
In normal operation, "normal heat retention" is to be given priority,
Good for various usage patterns (that is, when a normal usage pattern is not taken)
Good heat insulation (that is, a fixed set heat insulation temperature Ts)_FiveHeat control by heat control based on
Can be       [0102]   Other functions and effects are the same as those of the first embodiment, so that the description is omitted to avoid duplication.       [0103]   The invention of the present application is not limited to the configuration of each of the above-described embodiments, but departs from the gist of the invention.
Needless to say, the design can be changed as appropriate within a range that does not deviate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an electric rice cooker according to a first embodiment of the present invention. FIG. 2 is an enlarged plan view showing a control board unit in the electric rice cooker according to the first embodiment of the present invention. FIG. 3 is an electric circuit diagram showing a control circuit unit in the electric rice cooker according to the first embodiment of the present invention. FIG. 4 is a block diagram showing the contents of a microcomputer in the electric rice cooker according to the first embodiment of the present invention. FIG. 5 is a main routine of a flowchart showing heat retention control in the electric rice cooker according to the first embodiment of the present invention. FIG. 6 is a subroutine of a flowchart showing heat retention control in the electric rice cooker according to the first embodiment of the present invention. FIG. 7 is a characteristic diagram showing changes in rice cooking characteristics and a set warming temperature in the electric rice cooker according to the first embodiment of the present invention. FIG. 8 is a flowchart illustrating heat retention control in the electric rice cooker according to the second embodiment of the present invention. FIG. 9 is a characteristic diagram showing changes in rice cooking characteristics and a set warming temperature in the electric rice cooker according to the second embodiment of the present invention. FIG. 10 is a main routine of a flowchart showing heat retention control in the electric rice cooker according to the third embodiment of the present invention. FIG. 11 is one subroutine of a flowchart showing heat retention control in the electric rice cooker according to the third embodiment of the present invention. FIG. 12 is another subroutine of a flowchart showing heat retention control in the electric rice cooker according to the third embodiment of the present invention. FIG. 13 is a characteristic diagram showing changes in rice cooking characteristics and a set warming temperature in the electric rice cooker according to the third embodiment of the present invention. FIG. 14 is an enlarged plan view showing a control board unit in the electric rice cooker according to the fourth embodiment of the present invention. FIG. 15 is an electric circuit diagram showing a control circuit unit in the electric rice cooker according to the fourth embodiment of the present invention. FIG. 16 is a block diagram showing the contents of a microcomputer in an electric rice cooker according to a fourth embodiment of the present invention. FIG. 17 is a main routine of a flowchart showing heat retention control in the electric rice cooker according to the fourth embodiment of the present invention. FIG. 18 is a subroutine of a flowchart showing heat retention control in the electric rice cooker according to the fourth embodiment of the present invention. [Explanation of References] 22 is an operation board, 23 is a microcomputer, 28 is a center sensor, 33 is a warming / cancelling switch, 34 is a rice cooker start switch, 37 is a warming indicator lamp, 39 is a liquid crystal display, and 52 is a thermosensitive element. , 55 is a timer, 56 is a warming timer switch,
59 is a selection switch, 231 is a set temperature change means, 232 is a power supply control means, 23
3 fixed retained temperature setting means, the warning means 234, the command means 235, H ₁ is cooking heater, H ₂ is kept heater.

Claims (1)

Claims 1. A temperature detecting means for detecting a temperature of a rice cooker, wherein a power supply to a rice cooking heater and a heat retaining heater is controlled based on temperature information from the temperature detecting means. An electric rice cooker, wherein a set insulation temperature changing means for changing and setting a set insulation temperature from a temperature lower than a normal insulation temperature to a temperature higher than a normal insulation temperature according to the elapse of the insulation time after completion of rice cooking, and the set insulation temperature changing means Power supply control means for controlling power supply to the warming heater so that the rice cooker temperature becomes the set warming temperature changed and set by the setting warming temperature change setting by the set warming temperature changing means, and An electric rice cooker characterized in that the electric rice cooker is operated so as to be gradually increased as time passes. 2. An electric rice cooker comprising a temperature detecting means for detecting a temperature of a rice cooker, wherein the electric rice cooker is configured to control energization to a rice cooking heater and a heat retaining heater based on temperature information from the temperature detecting means. A setting temperature changing means for changing and setting the set temperature setting from a temperature lower than the normal temperature setting to a temperature higher than the normal temperature setting in accordance with a lapse of the temperature keeping time after the completion of rice cooking; and a setting changed and set by the setting temperature setting means. Energization control means for controlling energization to the insulated heater so that the rice cooker temperature becomes equal to the insulated temperature, the change setting of the set insulated temperature by the set insulated temperature changing means increases in proportion to the elapse of the insulated time. An electric rice cooker characterized by being performed as follows. 3. The electric rice cooker according to claim 1, wherein an upper limit value is set for the set warming temperature changed and set by the set warming temperature changing means. vessel. 4. A heat-retention timer switch for setting a meal time after the heat-retention is started, and when the meal time is set by the heat-retention timer switch, the set heat-retention temperature is set to the set heat-retention temperature changing means after the set time elapses. 4. The electric rice cooker according to claim 3, further comprising command means for instructing to change the set warming temperature so as to reach the upper limit value. 5. A fixed heat-retention temperature setting means for setting the set heat-retention temperature to a constant value regardless of the elapse of the heat-retention time when the heat-retention switch is turned on, and changing the set heat-retention temperature by the set heat-retention temperature changing means. The electric rice cooker according to any one of claims 1 to 4, further comprising selection means for selecting a setting and a fixed setting of the set heat retaining temperature by the fixed heat retaining temperature setting means. 6. The fixed setting of the set heat retaining temperature by the fixed heat retaining temperature setting means,
6. The electric rice cooker according to claim 5, wherein the priority is given when the cancel switch is turned on or when the rice cooker is reset. 7. The electric rice cooker according to claim 1, further comprising alarm means for warning a user when the heat retention time is equal to or longer than a predetermined time.