JP2005296538A - Electric rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce dissatisfaction of a user at the incompatible problem of high temperature heat reservation and progress of fatigue of boiled rice. <P>SOLUTION: This electric rice cooker has an ordinary heat reserving mode and a high temperature heat reserving mode of reserving heat at the temperature higher than the ordinary heat reserving mode, and attains the purpose by performing the high temperature heat reserving mode by changing heat reserving time at its preset temperature in response to the preset temperature of the high temperature heat reservation by the user. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric rice cooker that cooks rice by electric heating such as a heater or electromagnetic induction.

  Electric rice cookers have almost the same basic configuration regardless of the heating method. Referring to FIG. 1 showing the present embodiment, a rice cooker 3 that is heated in a vessel 2 that is closed by a lid 1 and is heated and cooked by heating, and the heating is performed. The heating means 4, the temperature sensor 5 which detects the temperature of the rice cooker 3, and the rice cooking control means 6 which controls the heating means 4 in the rice cooking mode based on the rice cooker temperature detected by the temperature sensor 5 are provided. Yes. Electric rice cookers have been provided for a long time, and have been steadily working to cook delicious rice. For example, recently, as shown in FIG. 9, a water absorption process in which rice is absorbed by low heat, a cooking process from boiling to high heat and fuzzy thermal power until the temperature starts to rise rapidly after the water disappears, and is heated to about 130 ° C. Then, the baking process to further remove excess moisture, and then lower the temperature to 115 ° C and maintain it for a certain period of time, then lower the temperature to 110 ° C and maintain it, and then the excess steam is blown off. The steaming process that further promotes alpha conversion and increases sweetness is sequentially performed to finish cooking rice. After cooking the rice, the temperature is lowered to a predetermined temperature, and the process proceeds to a temperature maintaining process for maintaining the temperature.

In addition, while the electric rice cooker is highly functional and multi-functional, as illustrated in FIG. 2 showing the embodiment of the present invention, white rice, quick cooking, classification, germination brown rice, brown rice, There are different types of rice porridge, sushi mushrooms, cooking, and steamed steam, and even if the amount of water is the same, you can set the difference between normal, caustic, soft, and moist. In addition, there are menus other than rice cooking such as washing without rice washing and cleaning with citric acid washing of bread fermentation, baking, rice cooker and lid.
Furthermore, it is possible to make a setting so that cooking is reserved and starts at the reservation time, or cooking ends at the reservation time.

On the other hand, the warming of the rice after cooking takes into account the fatigue of the rice, while the warming that keeps a little higher, for example, about 72 ° C., which is safe against spoilage, is not limited by time, while the user continues to keep warm. Has been done. In order to eat rice in a state closer to “freshly cooked” than such normal heat retention, heat is kept at a high temperature of, for example, about 90 ° C. for a predetermined time, for example, 3 hours. It is known to control to return to (for example, Patent Document 1).
JP 2001-309853 A

  By the way, evaluation of deliciousness of rice has many items such as appearance, aroma, sweetness, stickiness, elasticity, hardness, overall, where the sensory judgment association performs, the taste that the user feels, the difference in texture, In addition, if a difference in taste is added, a uniform evaluation cannot be made. However, in the survey on the actual use of the users by the present inventors, the evaluation of the heat retention at the rice temperature close to cooking is high. If this is done only for a uniform time set by the manufacturer, it is sufficient if the family can finish the meal within the uniform time after cooking rice, but it is unsatisfactory for the family who cannot do it because of the rhythm of life. Such dissatisfaction will be resolved by extending the high temperature incubation time, but the taste and texture of the rice will decrease as the fatigue of the rice will increase. In addition, there is a high tendency for the heat insulation time to be polarized between a short time of up to 5 hours and a long time of about 24 hours, and if the heat is kept at 90 ° C. even within the short time, the fatigue of the rice will progress. Even after returning to normal heat retention after a short period of time, it will greatly affect long-term heat retention. Furthermore, if the amount of rice is small, the fatigue progresses quickly at high temperature insulation, which also causes dissatisfaction for the user.

  The objective of this invention is providing the electric rice cooker which can reduce the dissatisfaction of the user with respect to the problem which is not compatible with the progress of the high temperature heat retention and the fatigue of rice from the above knowledge.

  In order to achieve the above object, the electric rice cooker of the present invention includes a rice cooker that cooks rice by heating in a closed lid, a heating means that performs the heating, and a temperature that detects the temperature of the rice cooker. The selected heat-retention mode is selected between the normal heat-retaining mode and the high-temperature heat-retaining mode for maintaining the temperature at a higher temperature than the normal heat-retaining mode. In the electric rice cooker equipped with the control means for performing the heat retention in the mode, the high temperature heat insulation mode has one feature that the heat retention time at the set temperature is changed according to the set temperature of the high temperature heat insulation by the user. Yes.

  In such a configuration, when the control means works by accommodating the rice cooker containing rice and water in the lid-closed vessel, rice cooking is automatically performed based on the rice cooker temperature detected by the temperature sensor, When cooking is finished, the rice is automatically warmed in the normal warming mode or high-temperature warming mode. In particular, in the high temperature heat insulation mode, heat insulation is performed at a temperature set by the user. However, since the control means changes the heat retention time according to the set temperature of the high temperature heat retention, the heat retention time is shortened while ensuring it for the high set temperature, and the long heat retention time is secured for the low set temperature, In either case, the progress of the rice fatigue can be suppressed while maximizing the actual benefit of the high temperature insulation required by the user.

  The electric rice cooker of the present invention is also detected by a rice cooker that cooks rice by heating in a closed lid, a heating means that performs the heating, a temperature sensor that detects the temperature of the cooker, and a temperature sensor. Control means that performs heating in the selected heat-retaining mode of the normal heat-retaining mode and the high-temperature heat-retaining mode that retains the temperature at a higher temperature than the normal heat-retaining mode after cooking the rice by controlling the heating means in the rice-cooking mode based on the rice cooker temperature In the electric rice cooker provided with the above, the high temperature heat insulation mode has another feature in that it is executed by changing the heat insulation temperature during the set time according to the set time of the high temperature heat insulation by the user.

  In such a configuration, especially in the high temperature heat insulation mode, the control means changes the heat insulation temperature in accordance with the high temperature heat insulation setting time, so the heat insulation temperature is increased for a short setting time and secured for a long setting time. However, it is possible to suppress the progress of the fatigue of the rice while lowering the heat insulation temperature and ensuring the maximum benefit of the high temperature heat insulation required by the user in any case.

  The electric rice cooker of the present invention is also detected by a rice cooker that cooks rice by heating in a closed lid, a heating means that performs the heating, a temperature sensor that detects the temperature of the cooker, and a temperature sensor. Control means that performs heating in the selected heat-retaining mode of the normal heat-retaining mode and the high-temperature heat-retaining mode that retains the temperature at a higher temperature than the normal heat-retaining mode after cooking the rice by controlling the heating means in the rice-cooking mode based on the rice cooker temperature In the electric rice cooker having the above, the high temperature heat insulation mode has another feature that the high temperature heat insulation time is changed according to the amount of rice cooked determined in the rice cooking mode.

  In such a configuration, especially during the high temperature heat insulation mode, the control means changes the high temperature heat insulation time according to the amount of cooked rice determined at the time of rice cooking, so that progress of fatigue due to a small amount of rice can be suppressed while ensuring high temperature heat insulation. .

When the amount of cooked rice in the rice cooking mode is less than or equal to the predetermined amount, the high temperature insulation is performed for the shortest time.
When the amount of cooked rice is equal to or less than a predetermined amount, while maintaining high temperature heat retention, the heat retention time is minimized, so that the progress of rice fatigue due to extremely small amount of cooked rice can be suppressed.

  The electric rice cooker of the present invention is also detected by a rice cooker that cooks rice by heating in a closed lid, a heating means that performs the heating, a temperature sensor that detects the temperature of the cooker, and a temperature sensor. Control means that performs heating in the selected heat-retaining mode of the normal heat-retaining mode and the high-temperature heat-retaining mode that retains the temperature at a higher temperature than the normal heat-retaining mode after cooking the rice by controlling the heating means in the rice-cooking mode based on the rice cooker temperature In the electric rice cooker having the above, in the high-temperature heat-retaining mode, another feature is that the heat-retaining time at the set temperature at that time is changed according to the amount of rice determined halfway.

  In such a configuration, especially in the high temperature heat insulation mode, the amount of rice is determined in the middle of the heat insulation, and the heat insulation time is set accordingly, so even if the amount of rice is reduced while the food is eaten while keeping the heat, The heat retention time at the set temperature can be shortened to prevent fatigue from progressing.

  In addition, you may change high temperature heat retention temperature according to the amount of rice in high temperature heat retention mode, and can also respond | correspond by changing high temperature heat retention time together as mentioned above. In this case, it is preferable that the high temperature heat retention temperature is lower than the temperature at that time, and the high temperature heat retention time is shorter than the heat retention time at the previous heat retention temperature.

  Moreover, in the high temperature heat insulation mode, the high temperature heat insulation temperature may be changed according to the amount of rice cooked at the time of rice cooking. In addition to this, the high temperature heat insulation time can be changed as described above.

  In addition, when the high temperature heat retention mode ends, it is preferable to shift to heat retention at a heat retention temperature lower than that in the normal heat retention mode.

  In addition, a low temperature heat retention mode is provided, and the heat retention control can be changed between when the normal heat retention mode shifts to the low temperature heat retention mode and when the high temperature heat retention mode shifts to the low temperature heat retention mode.

  In addition, the amount of rice during high temperature heat insulation can be determined based on the temperature rise or fall gradient of the detected temperature, or the on time or off time of the heating output up to a predetermined temperature difference. Even in this case, it is better to see the temperature change after increasing the heating output to raise the temperature, and it can also serve as a sterilization operation during the heat retention.

  In addition, when the determination of the amount of cooked rice and the determination of the amount of cooked rice are performed, priority is given to the determination of the amount of cooked rice, and when the determination of the amount of rice exceeds the determination of the amount of cooked rice, It is set as the high temperature heat retention temperature or high temperature heat retention time according to the judgment.

  In addition, when the high temperature heat insulation mode is finished, it is preferable to shift to the normal heat insulation. In this case, it is preferable to perform the normal heat insulation temperature lower than the normal heat insulation temperature in the normal heat insulation mode.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be employed alone or in combination in various combinations as much as possible.

  According to one feature of the electric rice cooker of the present invention, the high-temperature heat retention mode is executed in a user-specific mode in which the heat-retention temperature can be set, and the user's attention temperature and the corresponding taste and texture are maintained at the high-temperature heat retention. It is possible to satisfy the maximum and prevent the taste and texture from being deteriorated by the fatigue of rice.

  According to another feature of the electric rice cooker of the present invention, the high temperature heat insulation mode is executed in a user specific mode in which the heat insulation time can be set, and the high temperature heat insulation during the attention time reflected by the life rhythm of the user's family and the like is reflected. It can guarantee the maximum high-temperature insulation without sacrificing the taste and texture due to fatigue of rice, and the texture and texture.

  According to other characteristics of the electric rice cooker of the present invention, the high temperature heat retention mode is performed for a time corresponding to the amount of rice cooked, and the high temperature heat retention with respect to the amount of rice becomes excessive so that fatigue progresses and the taste and texture decrease. Can be prevented.

  According to a further configuration, the amount of cooked rice in the rice cooking mode is less than the predetermined amount and the high temperature heat insulation is executed for the shortest time. Even if the amount of cooked rice is extremely small, the rice is fatigued by the high temperature heat insulation and the taste and texture are reduced. Can be prevented.

  According to another characteristic of the electric rice cooker of the present invention, even when the rice is eaten while being kept warm and reduced in weight, it is possible to prevent the rice from being fatigued at high temperature and being reduced in taste and texture.

  Hereinafter, embodiments of the electric rice cooker according to the present invention will be described in detail with reference to FIGS. 1 to 8 to provide an understanding of the present invention.

  The electric rice cooker according to the present embodiment has the basic configuration described above with reference to FIG. 1, but as the heating means 4, the rice cooker 3 is mainly heated by electromagnetic induction to produce the contents. The heating coil 11 to be heated is used, and the heating coil 11 is disposed so as to generate heat at the bottom of the rice cooker 3 and its outer periphery. The heating means 4 includes a heat retaining heater 12 for heating the body of the rice cooker 3, a metal inner lid 13 for closing the mouth of the rice cooker 3 with a seal packing 13a inside the lid 1 for closing the container 2 The shoulder heater 14 for heating at the shoulder portion of 2 is provided in combination, and various heating processes at the time of cooking rice and heat insulation after cooking are performed. However, the present invention is not limited to this, and the rice cooker 3 and the inner lid 13 may be heated by electromagnetic induction from a heating coil disposed in each part, or the whole may be heated by a heater. It may be a thing.

  The heating coil 11 is subjected to high-frequency driving using the switching function of the IGBT 16 mounted on the driving substrate 15 and is output with a heating capacity necessary at that time. Heating elements such as IGBTs 16 are mounted on the drive substrate 15, and a cooling fan 17 for cooling them is provided in the container body 2. Further, in particular, the IGBT 16 that generates a large amount of heat is brought into contact with the heat sink 18 in order to enhance its cooling effect, thereby facilitating cooling. A control circuit in which a 100 V AC current is directly supplied to the heat retaining heater 12 and the shoulder heater 14 through the power supply circuit 19 and a microcomputer 22 provided inside the operation board 31 provided in the front portion of the driving substrate 15 and the shoulder portion is mounted. Each of the power supplies 23 is supplied with a necessary direct current, and these constitute a control means 6.

  The lid 1 applied to the container body 2 is detachably fitted to the hinge piece 32 pivotally supported so as to be raised and lowered by a hinge pin 131 at the rear part of the container body 2, and is rotated integrally with the hinge piece 32. The upper end of the container 2 can be opened and closed. A spring 33 that biases the lid 1 in the opening direction is exerted on the hinge piece 32 between the hinge piece 32 and the container body 2. A brake mechanism for braking the opening operation by the bias of the spring 33 is provided as necessary, and a lock claw 34 biased by a spring (not shown) is provided so as to lock the lid 1 in a closed position so that the lid 1 does not open freely. Then, the lid 1 is automatically opened by the bias of the spring 33 by rotating the lock claw 34 against the spring.

  The shoulder heater 14 is accommodated in a groove 35 formed on the upper surface of the shoulder portion of the vessel body 2 and is provided with a metal cover 36, and the outer peripheral portion of the inner lid 13 provided inside the lid 1 is in contact with the metal cover 36 and shoulders. The heat of the heater 14 is conducted and the entire opening of the rice cooker 3 is heated uniformly from above. A valve 37 is provided at the center of the lid 1 to release steam appropriately to the outside so that delicious rice can be cooked. The outer wall 41 and the inner wall 42 of the vessel body 2 are connected and integrated at their upper ends by a shoulder member 43 to constitute a vessel made of synthetic resin. Synthetic resin has magnetic permeability, and is effective if the heating coil 11 or the like is provided in a range where the rice cooker 3 is electromagnetically heated, but there is no such effectiveness in other parts, and other members and Can be substituted.

  The lid 1 has a heat insulating structure in which the space between the upper plate 44 and the lower plate 45 made of synthetic resin is filled with a heat insulating material 46, and the valve 37 is inserted into the through hole 47 in the center from the upper side. The steam escape cylinder 48 serving as a knob of the inner lid 13 is elastically engaged so as to be detachable by an elastic bush 49. The body 2 further incorporates a take-up reel 51 for a power cord, and is pivotally supported externally so that a hand handle 52 can be raised and lowered.

  Around the bottom of the inner wall 42 of the vessel body 2, a synthetic resin-made radial coil base 53 is arranged to hold the heating coil 11 from below. A ferrite core 54 is provided in the downward direction formed in each radial part of the coil base 53 to assist the function of the heating coil 11. The temperature sensor 5 passes through the central hole 55 of the inner wall 42 in the central portion of the coil base 53 and contacts the bottom of the rice cooker 3 to detect the temperature of the rice cooker 3.

  As shown in FIG. 2, the operation panel 31 is provided with a liquid crystal display 61 for displaying a menu for cooking and keeping warm, an operation state, a time, and other messages in the central portion. In addition to rice cooking / no washing rice key 62 for selecting washing-free rice cooking, rice cooking time reservation in 3h, 4h, 5h, 6h hourly reservation cooking rice settings that can be seen on the liquid crystal display 61, before cooking Reservation key 63 for setting a pretreatment mode for water absorption as a treatment, cancel key 64 for various inputs, a heat retention / selection key 65 for artificially starting the heat retention and selecting a heat retention state, and a rice cooking menu are set. Menu key 66 for cooking, cooking key 67 for selecting rice cooking, cooking 1, 2, 3 and bread / cooking key 68 for selecting a mode such as bread fermentation, baking and cleaning When key 69 for time setting, such as partial key 70, the operation keys necessary settings are provided. The liquid crystal display unit 61 and its surroundings are configured to display a description mode, lighting display, rotation display, etc. of the setting mode, cooking time, reservation time, cooking or reservation remaining time, cooking state, and the like.

  As shown in FIG. 3, the microcomputer 22 performs cooking such as cooking rice and hot spring eggs according to the input from the operation panel 31, based on the temperature information from the temperature sensor 5, the heating coil 11, the insulation heater 12, the shoulder. The heater 14 and the cooling fan 17 are driven via respective drivers 71, 72, 73, 74. For this purpose, the microcomputer 22 has a control means 75 for controlling the cooking and cooking of various menus in each mode as an internal function, and displays the setting state, operation state, elapsed time, remaining time, etc. on the operation panel 31. Like to do. Thereby, the rice cooker 3 in which cooked food such as white rice and water is accommodated in the container 2 with the lid 1 closed, and the heating means 4 is operated in the mode according to the setting to make the rice cooked rice and other rice Ready to cook.

  In the present embodiment, there is a high temperature heat retention mode in which heat is retained at a temperature higher than the normal heat retention mode selected by the heat retention selection key 65. In order to simplify the description, the heat insulation mode setting is accepted when a setting operation for white rice cooking is performed, and is set to a selection mode that does not change over a predetermined time. In the example shown in FIG. 2, in particular, the user is informed that the normal warming mode is selected by turning on the character display 101 of “long-lasting warming” shown in FIG. In addition, the selection state of the high-temperature heat-retaining mode should be indicated by indicating that the rice is freshly cooked or has a taste and texture close to that by lighting the character display 102 of “freshly-heated heat” shown in FIG. ing. In the normal heat retention mode, as shown by a broken line in FIG. 4, the heat retention after the rice cooking is performed at a temperature 72 ° C. slightly higher than the safe temperature against rot as the normal heat retention temperature T1. On the other hand, in the high temperature heat insulation mode, as shown by a solid line in FIG. 4, a temperature higher than the normal heat insulation temperature T1, for example, 78 ° C. or more is performed as the high temperature heat insulation temperature T2. When the high temperature insulation mode is selected, a setting operation of the high temperature insulation temperature T2 is accepted, and the rotary method is selected from a plurality of high temperature insulation temperatures 78 ° C., 82 ° C., 85 ° C., etc. displayed on the liquid crystal display unit 61. In this way, the temperature is set to a selected temperature that does not change for a predetermined time. However, the heat retention mode and the heat retention temperature can be selected by various methods.

  Waiting for these setting operations, the control means 75 starts white rice cooking, determines the initial water temperature as shown in FIG. 4 and sets the water absorption time t1 in the water absorption process, then shifts to water absorption, and rises to the water absorption temperature. After maintaining the water absorption temperature for a set time t1 after the temperature is reached, the temperature is raised until boiling and cooking is performed to maintain it. After the nomurai, the rice cooked rice is finished. After cooking rice, the control means 75 shifts to heat retention in the selected mode. In particular, in the present embodiment, the high temperature heat insulation mode is executed by changing the heat insulation time t2 shown in FIG. 4 at the set temperature T2 according to the set temperature T2 of the high temperature heat insulation by the user. Accordingly, as shown in FIG. 5, a high set temperature 85.degree. C. with respect to the high temperature hold temperature T2. The high temperature heat retention time t2 of about 6 hours is ensured at 0 ° C., and in any case, the progress of the fatigue of the rice can be suppressed while ensuring the actual benefits of the high temperature heat retention required by the user. Note that, for an intermediate set temperature of 82 ° C., an intermediate high temperature heat retention time t2 is set to about 4 hours. As a result, the high temperature insulation mode is executed in a user-specific mode in which the high temperature insulation temperature T2 can be set to satisfy the user's high temperature insulation temperature, the corresponding taste and texture, and the fatigue of rice. Therefore, it is possible to prevent the taste and texture from being lowered.

  However, as another example, the control means 75 can execute the high temperature heat insulation mode by changing the heat insulation temperature during the set time according to the set time of the high temperature heat insulation by the user. Accordingly, as shown in FIG. 6, the high temperature insulation temperature T2 is set high to about 85 degrees for the setting of about 2 hours in the high temperature insulation mode and the short high temperature insulation time t2, and about 6 hours. In order to set the long high temperature heat retention time, the high temperature heat insulation temperature T2 is lowered to about 78 ° C. while ensuring the maximum benefit of the high temperature heat insulation required by the user in each case, Progress can be suppressed. As a result, the high temperature heat insulation mode is executed in the user-specific mode in which the high temperature heat insulation time t2 can be set, and the high temperature heat insulation during the sticking time reflected by the life rhythm of the user's family, etc. It can guarantee the maximum high temperature insulation without deterioration and the taste and texture.

  In any case, it is convenient for the user to return to the normal heat insulation as shown by the solid line in FIG. 4 as long as the rice remains when the high temperature heat insulation is completed. However, in this case, there is a tendency that the fatigue of the rice is likely to proceed due to high temperature heat retention, and therefore, as shown in FIG. 4, there is a concern of rot of, for example, about 70 ° C. slightly lower than the normal heat retention temperature T1 in the normal heat retention mode. It is preferable to keep the temperature at a high temperature keeping temperature T3 after no high temperature. In addition, when the high temperature heat insulation mode is finished, it is preferable to shift to the normal heat insulation. In this case, it is preferable to perform the normal heat insulation temperature lower than the normal heat insulation temperature in the normal heat insulation mode.

  Such switching from the high temperature heat insulation mode to the normal heat insulation mode is performed, for example, as shown in the liquid crystal display unit 61 in FIG. 7 at a high temperature displaying the set heat insulation time 3h and the remaining time 2 hours in (a). The user can be notified by switching from the display state of heat insulation to the normal heat insulation state displayed for the remaining time in (b), and the progress can be notified in both cases of high temperature heat insulation and normal heat insulation.

  Here, a series of specific control examples from the cooked rice rice to the heat retention in which the heat retention temperature is selected and set as the heat retention mode will be described based on FIGS. 8 and 9 with reference to FIG. When white rice rice is selected as shown in FIG. 8, the selection operation of the heat retention mode is accepted, and when it is high temperature heat retention, the selection operation of the high temperature heat insulation temperature T2 is further accepted. For setting 1, 82 ° C, set for 4 hours, for selection of 78 ° C, set for 6 hours, set 3 for automatic warming time t2, and for normal warming, normal warming temperature Perform setting 4 without specifying time at 72 ° C. per T1. However, the normal heat retention temperature T1 may be set initially. After that, the rice cooking operation starts with the rice cooking start operation by the rice cooking / washless rice key 62. As shown in FIG. 4, the white rice cooking operation first determines the initial water temperature while keeping the heating coil 11, the heat retaining heater 12, and the shoulder heater 14 all off, and sets the water absorption temperature maintaining time t1 based on the determined water temperature. . Next, heating with the heating coil 800W, the heat retaining heater 0/16, and the shoulder heater 6/16 is continued until the temperature for water absorption reaches 50 ° C. From the relationship between the temperature rising gradient or the heating time and the temperature rising temperature range. The amount of cooked rice is determined and the heating output P at the time of water absorption is set. After reaching the water absorption temperature, the water absorption temperature is maintained at the set time t1 by turning on and off at this output depending on whether the water absorption temperature is higher or lower. When the water absorption is completed, the heating in the heating coils 1150 to 920 W, the heat retaining heater 0/16, and the shoulder heater 6/16 is continuously raised until boiling. After boiling, the heating in the heating coils 8/16, 700 W, the heat retaining heater 10/16, and the shoulder heater 6/16 is continued until the water is exhausted and the temperature is rapidly increased. So-called cooking. After cooking, steaming heating at about 110 ° C. is performed for a predetermined time by heating with the heating coil 800W, the heat retaining heater 10/16, and the shoulder heater 6/16, and when this is finished, the process shifts to heat retaining.

  As shown in FIG. 9, in accordance with setting 4, the temperature is lowered to 72 ° C. and the normal temperature is maintained. For other settings 1, after high temperature incubation at 85 ° C. for 2 hours, for setting 2 after high temperature incubation at 82 ° C. for 4 hours, for setting 3 at 78 ° C. After the temperature is kept for 6 hours, the temperature shifts to high temperature after 70 ° C. In addition, during both the heat retention after the high temperature and the normal heat retention, the presence / absence of the rice cooker 3 and the presence / absence of the cancel key operation are repeatedly determined while maintaining the heat retention. When no rice cooker is detected, the pan is informed and the power is turned off. Further, when the cancel key operation is detected, the heat retention mode is terminated and the apparatus is on standby.

  Moreover, the determination of the amount of cooked rice can also be performed at the time of temperature rise for cooking. As another example, in the high-temperature heat insulation mode, the amount of cooked rice determined in the cooked rice mode is used by the control means 75, and according to the amount of cooked rice. It can also be executed by changing the high temperature heat retention time t2. Thereby, the progress of fatigue due to a small amount of rice can be suppressed while ensuring high temperature heat insulation. Furthermore, if the amount of cooked rice in the rice cooking mode is less than or equal to the predetermined amount, if the high temperature heat insulation mode is executed only for the shortest time, the heat insulation time is minimized while ensuring the high temperature heat insulation mode. It is possible to suppress the progress of the fatigue of rice due to the small amount.

  Further, as another example, the control means 75, as shown in FIG. 10, is set to the set temperature T2 at that time according to the amount of rice determined from the temperature change data D when the heating output is increased or decreased during the high temperature heat retention mode. It is also possible to change the heat retention time t2 in FIG. Thereby, the amount of rice in the high temperature heat insulation mode is determined in the middle of the heat insulation, and the heat insulation time corresponding thereto is set to t2-tD or the like as in the example shown in FIG. Even when the amount is reduced, the heat retention time at the set temperature T2 at that time can be shortened to prevent fatigue from progressing.

  Instead, as shown in FIG. 11, the high temperature insulation temperature T2 is changed from the set state shown by the broken line to the solid line as shown by the broken line according to the amount of rice determined by the temperature change data D during the high temperature insulation mode time t2. In addition to this, as described above, it is possible to respond more finely by changing the high temperature heat retention time t2. In this case, it is preferable that the high temperature heat retention temperature T2 is lower than the temperature at that time, for example, T2-TD, and the high temperature heat retention time t3 is shorter than the heat retention time t3 at the previous heat retention temperature T2.

  Moreover, in the high temperature heat insulation mode, the high temperature heat insulation temperature may be changed according to the amount of rice cooked at the time of rice cooking. In addition to this, the high temperature heat insulation time can be changed as described above.

  Furthermore, when it is assumed to have a low temperature heat insulation mode that performs heat insulation at a temperature that is sufficiently lower than the normal heat insulation mode, such as 60 ° C., when the transition from the normal heat insulation mode to the low temperature heat insulation mode and from the high temperature heat insulation mode to the low temperature heat insulation mode By changing the heat retention control, it is possible to cope with the ease of progress of rice fatigue due to the difference in the heat retention temperature until then.

  In addition, the amount of rice during high temperature insulation is the relationship between the temperature rise or fall of the detected temperature, or the relationship between the predetermined temperature difference and the heating output increase time, on time, decrease time, or off time until the predetermined temperature difference is reached. In this case, as shown in FIG. 10 and FIG. 11, it is better to see the temperature change after increasing the heating output and raising the temperature. It can also serve as a sterilization operation during heat insulation. In addition, when the determination of the amount of cooked rice and the determination of the amount of cooked rice are performed, priority is given to the determination of the amount of cooked rice, and when the determination of the amount of rice exceeds the determination of the amount of cooked rice, It is set as the high temperature heat retention temperature T2 or the high temperature heat retention time t2 according to the determination.

  INDUSTRIAL APPLICABILITY The present invention can be practically used for rice cooking with an electric rice cooker, and can reduce user dissatisfaction with high temperature insulation and rice fatigue.

It is sectional drawing of the electric rice cooker which concerns on embodiment of this invention. It is a top view which shows the operation panel of the electric rice cooker of FIG. It is a block diagram which shows the control circuit of the electric rice cooker of FIG. It is a time chart which shows the rice cooking in the electric rice cooker of FIG. 1, and subsequent heat retention operation | movement. It is a graph which shows the example of a setting of the high temperature heat retention time with respect to the high temperature heat retention temperature of the user selection in the high temperature heat retention of FIG. It is a graph which shows the example of a setting of the high temperature heat retention temperature with respect to the high temperature heat retention time of the user selection in the high temperature heat retention of FIG. FIG. 5 is an explanatory diagram illustrating a display change example of the liquid crystal display unit in accordance with the transition from the high temperature heat retention mode of FIG. 4 to the normal heat retention mode. It is a flowchart which shows the example of control of the rice cooking stage of FIG. 4 at the time of rice cooking and heat retention. It is a flowchart which shows the example of control of the heat retention stage at the time of rice cooking and heat retention of FIG. It is a time chart which shows the example of adjustment of the high temperature heat retention time by determination of the amount of rice during high temperature heat retention. It is a time chart which shows another example of adjustment of the high temperature heat retention temperature by determination of the amount of rice during high temperature heat insulation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lid 2 Body 3 Rice cooker 4 Heating means 5 Temperature sensor 6, 75 Control means 11 Heating coil 12 Thermal insulation heater 13 Inner lid 14 Shoulder heater 22 Microcomputer 31 Operation panel 62 Rice cooking / washless key 68 Pan / cooking key 61 Liquid crystal Display 66 Menu key 69 Hour key 70 Minute key

Claims (5)

A rice cooker that cooks rice by heating in a vessel with the lid closed, a heating means that performs the heating, a temperature sensor that detects the temperature of the rice cooker, and a rice cooker temperature based on the rice cooker temperature that the temperature sensor detects. In the electric rice cooker equipped with the control means to perform the heating in the selected heat retention mode of the normal heat retention mode and the high temperature heat retention mode to retain the temperature higher than the normal heat retention mode The heat-retaining mode is executed by changing the heat-retaining time at the set temperature according to the set temperature of the high-temperature heat-retention by the user. A rice cooker that cooks rice by heating in a vessel with the lid closed, a heating means that performs the heating, a temperature sensor that detects the temperature of the rice cooker, and a rice cooker temperature based on the rice cooker temperature that the temperature sensor detects. In the electric rice cooker equipped with the control means to perform the heating in the selected heat retention mode of the normal heat retention mode and the high temperature heat retention mode to retain the temperature higher than the normal heat retention mode The electric rice cooker is characterized in that the heat insulation mode is executed by changing the heat insulation temperature during the set time according to the set time of the high temperature heat insulation by the user. A rice cooker that cooks rice by heating in a vessel with the lid closed, a heating means that performs the heating, a temperature sensor that detects the temperature of the rice cooker, and a rice cooker temperature based on the rice cooker temperature that the temperature sensor detects. In the electric rice cooker equipped with the control means to perform the heating in the selected heat retention mode of the normal heat retention mode and the high temperature heat retention mode to retain the temperature higher than the normal heat retention mode The electric heat cooker is characterized in that the heat insulation mode is executed by changing the high temperature heat insulation time according to the amount of rice cooked determined in the rice cooking mode. The electric rice cooker of Claim 3 which performs high temperature heat insulation only for the shortest time when the amount of rice cooking at the time of rice cooking mode is below predetermined amount. A rice cooker that cooks rice by heating in a vessel with the lid closed, a heating means that performs the heating, a temperature sensor that detects the temperature of the rice cooker, and a rice cooker temperature based on the rice cooker temperature that the temperature sensor detects. In the electric rice cooker equipped with the control means to perform the heating in the selected heat retention mode of the normal heat retention mode and the high temperature heat retention mode to retain the temperature higher than the normal heat retention mode An electric rice cooker characterized in that, in the heat retention mode, the heat retention time at the set temperature at that time is changed according to the amount of rice determined halfway.

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