JP2010268848A - Rice cooker and method of controlling warming of rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To execute proper warming by accurately determining the amount of cooked rice remaining under warming. <P>SOLUTION: The rice cooker heats rice and cooked rice in a rice cooking pot 10 housed in a rice cooker body 11 with heating means (induction heating coil 19, body heater 21, and lid heater 36), carrying out rice cooking with a controlling means (microcomputer 72), and determining a rice cooking capacity during the rice cooking. The rice cooker is equipped with lid state detecting means (rocking member 59 and photo interrupter 65) which detects the opening/closing state of a lid body 23; counting means (microcomputer 72) which starts counting the opening time when the opening of the lid body 23 is detected during the warming, and which stops counting when the closing of the lid body 23 is detected; and a warming amount determining means (microcomputer 72) which determines the remainder of cooked rice in the rice cooking pot 10 based on the rice cooking capacity, the opening time and a specific capacity taking-out time. The rice cooker thereby changes a heating control in the warming with the heating means in accordance with the estimated remainder of the cooked rice. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rice cooker and a heat control method for a rice cooker.

  2. Description of the Related Art Conventionally, home-use rice cookers have a rice cooker housed in a rice cooker body, and the upper opening is closed with a lid that is rotatably provided on the rice cooker body. And when a user performs a rice cooking process by operation of an operation panel, a rice cooking process is performed by heating a rice cooking pot with the heating means (induction heating coil etc.) arrange | positioned in the rice cooker main body, and this rice cooking process is carried out. When it is finished, the heat insulation process is executed.

  However, in the heat retaining treatment, there is a problem that if the heating is not performed at an appropriate temperature, the cooked rice in the rice cooking pan is excessively dried and spoilage bacteria (Bacillus subtilis) are propagated. Among them, spoilage bacteria can be prevented by increasing the set temperature for temperature control in the heat treatment, but in this case, drying of cooked rice cannot be prevented.

  On the other hand, in Patent Document 1, the amount of cooked rice reduced by opening and closing the lid once during the heat treatment is predicted, and the heating control in the heat treatment is changed when the opening and closing of the lid is detected. A bowl is provided. This rice cooker monitors the opening and closing of the lid during heat treatment. And it is set as the structure which sets the amount of reduction | decrease in one opening / closing based on the rice cooking capacity discriminate | determined by the number of times of opening / closing in one heat retention process, and the rice cooking process before the heat retention process.

  However, the amount of rice cooked by opening the lid is completely different depending on the family structure of the user's house. That is, the amount of rice reduction per time is completely different between a family living alone and a family living together. Moreover, in the case of a home where a plurality of people live, the amount of rice reduction due to one opening / closing of the lid is completely different between the state where the whole family is aligned and the state where the entire family is not aligned. For this reason, as in Patent Document 1, when the amount of decrease in one time is determined from the number of times the lid is opened and closed and the rice cooking capacity, an error is likely to occur in the predicted remaining amount of cooked rice. Moreover, since the determination method of this patent document 1 requires the past measurement data several times, appropriate heating control cannot be performed immediately.

JP 2007-195730 A

  It is an object of the present invention to provide a rice cooker capable of accurately determining the remaining amount of cooked rice during heat insulation and performing an appropriate heat treatment, and a heat insulation control method thereof.

  In order to solve the above problems, a rice cooker of the present invention includes a rice cooker body that houses a rice cooker, a heating means that heats cooked rice and cooked rice in the rice cooker, and is attached to the rice cooker body so as to be opened and closed. In a rice cooker comprising a lid for closing a rice cooking pan, a control means for controlling the heating means to perform a rice cooking process and subsequently performing a heat retention process, and a capacity determining means for determining the rice cooking capacity during the rice cooking process A lid state detecting means for detecting the open / closed state of the lid body, and when the opening of the lid body is detected based on a signal from the lid state detecting means during the heat retaining process, the counting of the opening time is started, and the lid body is closed. When the detection is detected, the counting means for stopping the counting of the open time, the rice cooking capacity determined during the rice cooking process by the capacity determination means, and the counting means during the heat retention process executed following this rice cooking process And a heat retention amount judging means for judging the remaining amount of cooked rice in the rice cooking pot based on the set specific capacity take-out time, and the control means is predicted by the heat insulation amount judgment means The heating control in the heat retaining process by the heating means is changed according to the remaining amount of cooked rice.

  And the heat retention control method of this rice cooker heats the cooked rice by heating the cooked rice in the cooked pot by controlling the heating means by the control means, and then heats the cooked rice in the cooked pot for heat insulation. This is a heat control method for a rice cooker that executes processing, and when the rice cooking process is executed, the rice cooking capacity is determined by the capacity determining means, and the lid state detecting means is used to open and close the lid body during the subsequent heat processing. After monitoring, when the lid state detecting means detects the opening of the lid, the counting means counts the opening time, and when the lid state detecting means detects the closure of the lid, the counting means stops counting the opening time The heat retention amount determining means determines the rice cooking capacity determined by the capacity determining means, the opening time counted by the counting means, and the set specific capacity Based on the departure time, the remaining amount of cooked rice in the rice cooking pan is determined, and the control unit changes the heating control by the heating unit according to the remaining amount of cooked rice predicted by the heat insulation amount determining unit. is there.

  When a user wants to use cooked rice in a bowl, the amount and time are approximately proportional. And in this invention, it was taken out from the rice cooking pot based on the rice cooking capacity discriminated by the capacity discriminating means, the opening time when the lid was opened and closed during the heat treatment, and the set specific capacity extraction time. Since the amount of cooked rice is judged and the remaining amount of cooked rice in the rice cooker is judged, a substantially accurate judgment can be made. Thereby, in heat insulation processing, since suitable heating control can be performed based on the judged remaining amount of cooked rice, drying of cooked rice and propagation of spoilage bacteria can be prevented. That is, even if the cooked rice in the rice cooker is heated and controlled at the same temperature control set temperature, for example, in full and small amounts, the actual rice temperature is different, so by performing the heating control according to the remaining amount, Can be prevented from breeding.

  In addition, in order to eliminate the uneven taste of cooked cooked rice and eat delicious rice, it is preferable to stir and mix the cooked cooked rice as a whole and release steam between cooked rice. When the user finishes the rice cooking process and shifts to the heat retaining process, it is common to stir the cooked rice.

  Therefore, in this rice cooker, the heat insulation amount judging means judges that the first one-time opening / closing of the lid after the transition from the rice cooking process to the heat insulation process has reduced the cooked rice from the rice cooker regardless of the opening time. Preferably not.

Or the stirring determination means which judges whether the opening and closing of the lid | cover of the 1st time after shifting to a heat retention process from rice cooking process stirs the cooked rice in the said rice cooking pan is provided, The said heat retention amount determination means If the stirring determination means determines that stirring is performed, it does not determine that the cooked rice has decreased from the rice cooker regardless of the opening time, and if the stirring determination means determines that stirring is not stirring, the cooked rice is determined based on the opening time. It is preferable to determine the remaining amount.
In this case, it is preferable that the agitation determination unit determines whether or not the agitation is based on whether or not the opening time of the lid has exceeded a preset agitation determination time.

Alternatively, in the first opening and closing of the lid after shifting from the rice cooking process to the heat retaining process, whether or not the opening time of the lid has exceeded a preset first agitation determination time, Stirring determination means for determining whether or not the stirring of the cooked rice has been completed, and when the opening time of the lid exceeds the first stirring determination time, the heat retention amount determining means determines the first stirring determination time from the opening time. It is preferable to determine the remaining amount of cooked rice based on the subtracted time.
In this case, the agitation determination means determines whether or not the agitation is based on whether or not the opening time of the lid has exceeded a preset second agitation determination time, and the opening time of the lid is the second. If it is less than the stirring determination time, the remaining amount of cooked rice is determined based on the opening time. If the opening time of the lid is not less than the second stirring determination time and not more than the first stirring determination time, only stirring is performed. It is preferable not to judge that cooked rice has decreased from the rice cooker regardless of the opening time.

  The agitation determination means is provided with a human body detection sensor that detects that a person has touched the rice cooker body due to a change in capacitance or the like, and determines whether or not the agitation is based on a signal from the human body detection sensor. May be.

Moreover, the said heat retention amount judgment means judges the reduction | decrease amount of cooked rice based on one opening time by the opening / closing of the said cover body, and specific capacity extraction time, From this reduction amount and the rice cooking capacity discriminate | determined by the said capacity | capacitance discrimination means The remaining amount of cooked rice in the cooking pot is determined. If it does in this way, the opening time at the time of opening a cover for the purpose of a user confirming the remaining amount of cooked rice in a rice cooker can be excluded.
Alternatively, the heat insulation amount determination means integrates the opening time for each opening and closing of the lid, determines a reduction amount of cooked rice based on the integrated opening time and the specific capacity extraction time, and this reduction amount and the capacity determination means The remaining amount of cooked rice in the rice cooking pan is determined from the rice cooking capacity determined by. Here, the “integrated opening time” includes both a configuration in which individually counted opening times are added and a configuration in which the previous opening time is continuously counted without being cleared. In this way, it is possible to suppress misrecognition of the remaining amount of cooked rice due to the time required to “good” the cooked rice that is different for each household.

Further, by the time when the heat insulation process is stopped by operation of the operation panel, the lid opening time counted by the counting means is integrated, and the specific capacity is extracted based on the integrated time and the rice cooking capacity by the capacity determining means. It is preferable to provide setting time changing means for calculating and changing the time.
In this case, the set time changing means may change the set time of the specific capacity take-out time only when the calculation result in the heat retention process matches the preset equivalent comparison condition two or more preset times. preferable.
In this way, the specific capacity extraction time, that is, the opening time of the lid required for taking out the specific volume of cooked rice can be reliably set according to the actual usage situation that is different in each home. Therefore, misidentification of the remaining amount of cooked rice can be reliably prevented.

  In the rice cooker of the present invention, based on the rice cooking capacity, the opening time of the lid and the specific capacity extraction time, the capacity of the rice taken out from the rice cooking pot is judged, and the remaining amount of rice in the rice cooking pot is judged. Accurate judgment can be made. Thereby, in heat insulation processing, since suitable heating control can be performed based on the remaining amount of cooked rice, drying of cooked rice and propagation of spoilage bacteria can be prevented.

It is sectional drawing which shows the rice cooker which concerns on this invention. It is a top view which shows the structure of a cover body. It is principal part sectional drawing of FIG. It is a disassembled perspective view which shows the structure of the cover state detection means of FIG. (A), (B), (C), (D) is a side view which shows the relationship between the operation state of a rocking | swiveling member, and the detection state of a cover state detection means. (A), (B) is sectional drawing which shows the operation state of the cover state detection means accompanying opening of a cover body. (A), (B) is sectional drawing which shows the operating state of the cover state detection means accompanying the movement of a moving member. (A) is a block diagram which shows the structure of a rice cooker, (B) is a graph which shows the judgment of the microcomputer by the relationship between the drive state of a solenoid, and the detection state of a photo interrupter. (A) is a chart showing the relationship between the opening time of the lid and the amount of reduction of cooked rice, and (B) is a chart showing an example of calculation of the amount of reduction. The relationship between rice cooking capacity and room temperature and temperature control setting temperature is shown, (A) is a chart showing the case of high temperature insulation, and (B) is a chart showing the case of low temperature insulation. It is a flowchart which shows the rice cooking process by a microcomputer. It is a flowchart which shows the heat retention process by a microcomputer. It is a flowchart which shows the rice remaining amount judgment process of FIG. It is a chart which shows an example of reduction amount calculation of a 2nd embodiment. It is a flowchart which shows the heat retention process of 2nd Embodiment. It is a flowchart which shows the specific capacity extraction time change process of FIG. It is a chart which shows an example of reduction amount calculation of a 3rd embodiment. (A), (B) is a table | surface which shows an example of the amount calculation of reduction accompanying the stirring determination of the microcomputer of 4th Embodiment. It is a flowchart which shows the rice remaining amount judgment process of 4th Embodiment. (A), (B) is a table | surface which shows an example of the amount calculation of reduction accompanying the stirring determination of the microcomputer of 5th Embodiment. The modification of the relationship between the opening time of the lid and the amount of reduction of cooked rice is shown, (A) is a time chart showing the relationship between the lid opening time and the time required for opening and closing the lid, and (B) shows the calculation of the amount of reduction. It is a chart.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a pressure rice cooker according to the present invention. This rice cooker includes a rice cooker body 11 that detachably houses a rice cooking pot 10 that is electromagnetically heated, and a lid body 23 that is rotatably attached to the rice cooker body 11. This rice cooker performs the 1st heat retention process continuously, after performing the rice cooking process according to the program set beforehand by the microcomputer 72 which is a control means. And the rice cooker of this embodiment is set as the structure which judges the remaining amount of cooked rice in the rice cooking pan 10 during a 1st heat retention process, and changes heating control (temperature control setting temperature) according to the remaining amount of cooked rice.

  The rice cooker main body 11 includes an exterior body composed of a cylindrical body 12, a bottom body 13 that closes a lower end opening of the body 12, and a shoulder body 14 that is attached so as to cover the upper end opening of the body 12. Yes. This shoulder body 14 is provided with an opening 15 for detachably arranging the rice cooker 10 at its approximate center, and the closed state of the lid 23 is maintained on the front side (left side in FIG. 1) of the opening 15. An engagement receiving portion 16 made of a hole is provided. In addition, a cylindrical inner cylinder 17 and a saucer-shaped protective frame 18 made of a non-conductive material are disposed in the opening 15 of the shoulder body 14. An induction heating coil 19, which is a first heating means, is disposed on the lower outer peripheral surface of the protective frame 18 via a ferrite core 20. A cylinder heater 21 as a second heating means is disposed on the outer peripheral portion of the inner cylinder 17. Further, the protective frame 18 includes a rice cooker temperature sensor 22 (thermistor) that is a first pot temperature detection means for detecting the temperature of cooked rice and cooked rice through the protective frame 18 and through the internal rice cooker 10. ) Is arranged.

  The lid body 23 is attached to a hinge receiving portion formed on the back portion of the shoulder body 14 so as to be able to be opened and closed (turned), and closes the upper end opening of the rice cooker body 11. The lid body 23 is detachably mounted on an upper plate 24 that constitutes an outer surface material together with an exterior body of the rice cooker body 11, a lower plate 29 that closes the bottom of the upper plate 24, and a lower surface of the lower plate 29. And an inner lid 46. An inside of the lid 23 is provided with an exhaust passage that communicates the inside of the rice cooker 10 with the outside, and pressure exhausting means for boosting the inside of the rice cooker 10 to a pressure higher than atmospheric pressure in the exhaust passage. A relief valve 49 is provided.

  The upper plate 24 is provided with an operation member 25 for opening the lid 23 at the front portion thereof. The operation member 25 includes a lock release operation portion 26 exposed on the surface of the exterior body, and a pressing portion 27 for rotating a lock member 31 described later in the lock release direction is provided on the inner surface thereof. The operation member 25 is biased upward by a kick spring (not shown). A steam port unit 28 that constitutes an outlet of the exhaust passage is disposed on the back of the upper plate 24.

  As shown in FIGS. 1 and 2, the lower plate 29 has a shape corresponding to the concave depression shape on the upper side of the shoulder body 14. On the back portion of the lower plate 29, there is provided a hinge connecting portion 30 that is pivotally attached to a hinge receiving portion of the shoulder body 14 so as to be rotatable by a shaft. Further, a lock member 31 is rotatably attached to the front portion of the lower plate 29. This lock member 31 is for maintaining the lid 23 in a closed state with respect to the rice cooker body 11, and is formed by bending a metal plate as shown in FIGS. . The lock member 31 is provided with shaft portions 32 for axially attaching to the lower plate 29 on both side surfaces thereof. Further, on both sides of the lower end edge of the lock member 31, a pair of detachably engaged with the engagement receiving portion 16 of the shoulder body 14 and engaged with the flange portion of the rice cooker 10 across the resin wall of the shoulder body 14. The engaging claw portion 33 is provided so as to have an L shape. Furthermore, the lock member 31 is provided with a receiving portion 34 that extends at an angle toward the back surface (hinge connection portion 30) upward at the center of the upper end and contacts the pressing portion 27 of the operation member 25. The lock member 31 is biased to the engagement position shown in FIG. 1 by a kick spring which is a biasing means (not shown).

  Further, as shown in FIG. 1, a lid heater 36 as third heating means is disposed on the bottom of the lower plate 29 via a metal heater cover 35, and at the second pan temperature detecting means. A certain lid temperature sensor 37 (see FIG. 8A) is provided. Further, the lower plate 29 is provided with a first accommodating portion 38 that accommodates a relief valve 49 disposed in the inner lid 46 and constitutes an inlet portion of the exhaust passage. Further, a second accommodating portion 39 that accommodates a pressure regulating valve disposed in the inner lid 46 is provided beside the first accommodating portion 38.

  The lower plate 29 is provided with a first solenoid 40 that is a driving means for the relief valve 49 on the front side of the first accommodating portion 38, and a pressure regulating valve driving means on the front side of the second accommodating portion 39. A second solenoid 41 is provided. These solenoids 40 and 41 are two-position solenoids and are provided with rods that advance and retreat depending on the presence or absence of energization. Further, the solenoids 40 and 41 are configured so that the rod moves backward in the left direction in FIG. 1 when energized, and moves rightward in FIG. 1 by the biasing force of the spring when the energization is interrupted. A pressing member 42 that presses the spherical member 52 of the relief valve 49 located in the first accommodating portion 38 is disposed at the tip of the rod of the first solenoid 40. In addition, a pressing member 43 capable of pressing the pressure regulating valve downward is disposed at the tip of the second solenoid 41.

  The pressing member 42 is provided with a moving member 44 that locks the lid 23 so that it cannot be opened using the driving force of the first solenoid 40. As shown in FIG. 2, the moving member 44 is formed of a rectangular frame, and when the first solenoid 40 is energized, the rod moves backward to move toward the lock member 31 via the pressing member 42. On the other hand, when the energization to the first solenoid 40 is interrupted, the rod moves and moves away from the lock member 31. The end of the moving member 44 on the side of the lock member 31 constitutes a lock portion 45 that can be moved back and forth in the moving region of the lock member 31. In addition, as shown in FIG. 7A, in this moving member 44, the engagement claw portion 33 of the lock member 31 is engaged with the engagement receiving portion 16 of the rice cooker body 11 with a normal engagement allowance. In the state, the lock member 31 can move to the lock position that has entered the lower portion of the receiving portion 34. Further, as shown in FIG. 7 (B), there is a possibility that the lid 23 may be opened when the engagement margin between the engagement claw portion 33 and the engagement receiving portion 16 is insufficient and the internal pressure of the inner pot increases. In the engaged state, by abutting against the receiving portion 34 of the lock member 31, the locking member 31 stops at a half-lock position where it cannot enter the lower portion of the receiving portion 34 (see FIG. 5D).

  As shown in FIG. 1, the inner lid 46 includes a metal inner lid body 47 and a lid packing 48, and is detachably disposed at the lower portion of the heater cover 35. The inner lid body 47 of the inner lid 46 includes a relief valve 49 disposed in the first housing portion 38 of the lower plate 29 and a pressure regulating valve (not shown) disposed in the second housing portion 39. It is arranged integrally.

  The relief valve 49 includes a valve seat member 50 having a trapezoidal cylindrical shape and a cover 51 that covers the valve seat member 50, and a spherical member 52 is disposed in the inside thereof so as to be able to roll. When the spherical member 52 closes the air hole 53 formed in the valve seat member 50 by rolling, the air in the rice cooker 10 is prevented from being exhausted to the outside, and the pressure in the rice cooker 10 is higher than atmospheric pressure. Can be pressurized. Moreover, the internal pressure of the rice cooking pot 10 is returned to the atmospheric pressure (equilibrium) by being pressed by the pressing member 42 to release (open) the blockage of the exhaust passage. In addition, the spherical member 52 uses the thing of the weight which rolls so that it may leave | separate from the ventilation hole 53 with the pressure, if the pressure in the rice cooker 10 raises to 1.30 atm.

  The pressure regulating valve (not shown) includes a valve body biased downward by a spring, and the vent hole is closed by the valve body. In the pressure regulating valve, the force for closing the vent hole is changed by changing the urging force of the spring by the pressing member 43. Thereby, the pressure which can pressurize the inside of the rice cooking pot 10 in the range of 1.15 atm to 1.20 atm is changeable.

  Note that the lid body 23 to which the inner lid 46 is attached is provided inside the relief valve 49 and the pressure regulating valve, from the gap between them and the accommodating portions 38 and 39, to the gap between the inner lid body 47 and the heater cover 35, and the steam port. The path that passes through the unit 28 constitutes an exhaust passage that allows the inside of the rice cooker 10 to communicate with the outside.

  The lid body 23 of the present embodiment is provided with a rocking member 59 as lid state detecting means for detecting the open / closed state of the lid body 23, and the movable position of the rocking member 59 is a non-contact sensor. The detection is performed by the interrupter 65. Further, in the present embodiment, by providing the moving member 44 with the holding portion 54 that is disposed in a state where the swing member 59 can swing, the engagement claw portion of the lock member 31 can be obtained with one photo interrupter 65. It is comprised so that the engagement state of 33 and the engagement receiving part 16 of the rice cooker main body 11 can be detected further.

  The holding part 54 projects from the side part of the moving member 44 and includes a pair of support walls 55A and 55B. A first mounting hole 56 is provided in the upper part of these support walls 55A and 55B, and a swinging member 59 is swingably mounted by penetrating a separate pin 57 therethrough. In addition, a stopper portion 58 that stops the rotation of the swing member 59 is installed on the support walls 55 </ b> A and 55 </ b> B above the first mounting hole 56.

  The swing member 59 includes a rod-shaped detection unit 60 that extends and is positioned below the stopper unit 58 at a predetermined interval. At the tip of the detection unit 60, the detection region in the facing space between the light emitting unit 66 and the light receiving unit 67 of the photo interrupter 65 is removed at the lock position where the moving member 44 has entered the lower part of the receiving unit 34 of the lock member 31. A projecting portion 61 projecting to a position is provided (see FIG. 5B). Further, the swinging member 59 is provided with a balance portion 62 that protrudes downward, and a second mounting hole 63 corresponding to the first mounting hole 56 is provided at an upper portion of the balance portion 62. A separate weight 64 is disposed at the lower end of the balance portion 62 so that the detector 60 is balanced in a state of extending in the horizontal direction. The swinging member 59 maintains a state where a part of the swinging member 59 has entered the position excluding the detection region in the facing space of the photo interrupter 65 in a state where the detection unit 60 is in contact with the stopper unit 58. (See FIG. 5C).

  The photo interrupter 65 detects the proximity and separation of the detecting unit 60 of the swinging member 59 in a non-contact state, and includes a light emitting unit 66 provided with a light emitting element and a light receiving unit 67 provided with a light receiving element. ing. The light emitting portion 66 and the light receiving portion 67 are disposed in the opposing wall portion of the guide frame having a substantially U shape. The guide frame guides the swing member 59 so as to be movable in the facing space. Therefore, a part of the facing space constitutes a detection area. The photo interrupter 65 can receive the light of the light emitting element in a state where the detection unit 60 that is a shielding object does not exist in the detection region, and can detect the light of the light emitting element when the detection unit 60 enters the detection region. The light receiving element cannot receive light. Then, a light receiving state or a non-light receiving state, which means a detection state of the detection unit 60, is output to the microcomputer 72 as a predetermined signal.

  The photo interrupter 65 is mounted on the detection board 68 and is installed at a height corresponding to the detection unit 60 of the swing member 59. Here, the substantial detection part of the light receiving part 67 is located inside the exposure hole 67a provided in the facing surface. Therefore, the same shape area in the axial direction of the exposure hole 67a constitutes a detection area. As shown in FIG. 5B, the exposure hole 67a is positioned above the protruding portion 61 of the swinging member 59 in a state where the moving member 44 is in the locked position. The light receiving path is not cut off. Further, as shown in FIG. 5C, the exposure hole 67a is located at a second movable position where the detection unit 60 is in contact with the stopper unit 58, and is located below the lower end of the detection unit 60. The light receiving path is not blocked by the detection unit 60 at the position. That is, in the state where the lid 23 is closed and the moving member 44 is moved to the unlock position and the half-lock position, the photo interrupter 65 blocks the light receiving path by the detection unit 60 and moves the moving member 44. Is moved to the locked position, the projecting portion 61 is located below the light receiving path, and is installed at a position where the detecting section 60 does not block the light receiving path. If the moving distance (interval) of the moving member 44 from the unlock position to the half-lock position is L1, and the movement distance from the unlock position to the lock position is L2, these are L1 <L2. For this reason, the region where the moving distance is less than or equal to L1 is set to be a non-detection region of the photo interrupter 65. That is, the non-detection region means a region in which the light receiving unit 67 of the photo interrupter 65 cannot receive light from the light emitting element of the light emitting unit 66 because the detection unit 60 is in a state of blocking the light receiving path. To do. Accordingly, when the swing member 59 moves beyond the distance L1 via the moving member 44, the detection unit 60 deviates from the non-detection region and can detect the state.

  In this rice cooker, an operation panel 69 having a switch for a user to input rice cooking conditions and a liquid crystal display panel for displaying a selection state and an operation state is disposed on the front upper portion of the shoulder body 14. . Further, as shown in FIG. 1, a control board 70 is disposed between the exterior body and the protective frame 18. The control board 70 is provided with an external temperature sensor 71 which is an external temperature detecting means for detecting the temperature of the external atmosphere of the rice cooker 10. The external temperature sensor 71 is a thermistor having excellent resistance to dust and humidity. In the bottom body 13 of the present embodiment, an intake port (not shown) is provided on the front side where the control board 70 is provided, and an exhaust fan for intake is further provided on the front side. Therefore, the external temperature sensor 71 is configured to be able to detect the temperature of the outside air that is sucked into the exterior body and has not yet cooled the device. Further, a microcomputer 72 is mounted on the control board 70, and control is executed by the microcomputer 72 according to a preset program.

  In the present embodiment, when the operation of the rice cooking switch disposed on the operation panel 69 is detected, the rice is preheated, heated (medium-pump), and maintained in accordance with the rice cooking program based on the rice cooking conditions set by the liquid crystal display panel. After performing the rice cooking process which consists of each process of twice cooking and murame, the 1st heat retention process which heats the cooked cooked rice to predetermined temperature is performed continuously. Moreover, when the heat retention switch of the operation panel 69 is operated in the standby mode in which neither the rice cooking process including the reservation nor the first heat retention process is performed, a second heat retention process different from the first heat retention process is performed.

  In the rice cooking process, the open / close state of the lid 23 is detected (determination) based on a signal from the photo interrupter 65 with the driving of the first solenoid 40 immediately after reception of the rice cooking switch and at the start of the temperature raising process. After that, the lid state inspection process for detecting (determining) the engagement state of the engagement receiving portion 16 of the rice cooker body 11 and the engagement claw portion 33 of the lock member 31 is executed. When it is determined that the lid body 23 is in the closed state and the engagement receiving portion 16 and the engagement claw portion 33 are determined to be in the normal engagement state, the rice cooking process is executed (continued). On the other hand, when it is determined that the lid body 23 is in the open state, and when it is determined that the engagement receiving portion 16 and the engagement claw portion 33 are in the abnormal engagement state, the first solenoid 40 is energized. It stops and the moving member 44 is unlocked to stop the rice cooking process.

  The microcomputer 72 serves as a capacity discriminating means for discriminating the rice cooking capacity during the rice cooking process. Specifically, in the heating process during the rice cooking process, the rice is heated together with water by supplying power to the induction heating coil 19 with full power. At this time, the actual rice cooking capacity is determined based on the actual temperature increase time required for increasing the temperature from the preset first set temperature to the second set temperature and the capacity determination data stored in advance. To do. Note that the capacity determination data includes both an arithmetic expression set based on a rice cooking capacity measured in advance and a capacity determination gradient based on the temperature increase time, and a data table of temperature increase times corresponding to a plurality of rice cooking capacities.

  On the other hand, in the first heat retaining process, the microcomputer 72 detects (monitors) the opening / closing of the lid body 23 based on a signal from the photo interrupter 65. The microcomputer 72 serves as a counting means. When the opening of the lid body 23 is detected via the photo interrupter 65, the microcomputer 72 starts counting the opening time t, and when detecting the closing of the lid body 23, the counting of the opening time t is stopped. To do. Then, the microcomputer 72 played the role of the heat insulation amount judgment means in the rice cooker 10 and measured the rice cooking capacity determined during the rice cooking process before the first heat insulation process every time the opening / closing of the lid 23 was detected. The remaining amount of cooked rice in the rice cooker 10 is determined based on the opening time t of the lid body 23 and the set specific capacity extraction time ta. Specifically, the amount of cooked rice (number of Cups) taken out from one opening time t and the specific capacity take-out time ta is determined, and the amount of cooked rice taken out from the rice cooking capacity (decrease amount) is subtracted. Determine (monitor) the amount. And the microcomputer 72 is set as the structure which changes the heating control by the induction heating coil 19, the trunk | drum heater 21, and the lid | cover heater 36 according to this estimated rice remaining amount.

  In addition, in order to eliminate the uneven taste of the cooked cooked rice and eat delicious rice, the cooked cooked rice is stirred and mixed together to release steam between cooked rice. It is widely known that it is preferable. And it is thought that many users are actually performing this work. Therefore, in this embodiment, the microcomputer 72 as the heat insulation amount determining means determines that the first opening and closing of the lid body 23 after shifting from the rice cooking process to the first heat insulation process is a mixture of rice. Regardless of the opening time t of the lid 23, it is not determined that the cooked rice has been reduced from the rice cooker 10 (the remaining amount of cooked rice is not reduced).

  Moreover, if the heating control by the microcomputer 72 determines that the cooked rice in the rice cooker 10 has decreased by a predetermined capacity or more during the first heat treatment, the temperature is adjusted based on the detection value of the temperature sensor 22 for the rice cooker. It is configured to increase the adjustment temperature. Moreover, in the present embodiment, the temperature adjustment set temperature is further changed based on the temperature detected by the external temperature sensor 71 and a preset reference (standard) temperature. Specifically, when the temperature detected by the external temperature sensor 71 is lower than a preset reference temperature, the temperature adjustment set temperature is lowered, and when the temperature detected by the external temperature sensor 71 is higher than the reference temperature, the temperature adjustment set temperature is increased. It is configured. Here, the temperature adjustment set temperature is the set temperature of the rice cooker temperature sensor 22.

  Next, the lid state inspection process including the determination of the open / close state of the lid 23 by the microcomputer 72 and the engagement state determination of the engagement receiving portion 16 and the engagement claw portion 33 will be described.

  In this lid state inspection step, the microcomputer 72 determines the open / close state of the lid 23 based on the signal from the photo interrupter 65 in the unlocked operation state where the first solenoid 40 is deenergized. Further, the microcomputer 72 determines the engagement state of the engagement receiving portion 16 and the engagement claw portion 33 based on the signal from the photo interrupter 65 in the lock operation state where the first solenoid 40 is energized.

  Specifically, the lid 23 is closed so as to be positioned substantially in the horizontal direction with respect to the rice cooker body 11, and the movable member 44 is moved to the unlock position via the first solenoid 40. The moving member 59 is in the state shown in FIGS. 3 and 5A. In this state, since the detection unit 60 of the swinging member 59 at the first movable position has entered the detection area of the photo interrupter 65, the photo interrupter 65 is off. Therefore, as shown in FIG. 8 (B), the microcomputer 72 closes the lid 23 by detecting a state in which the photo interrupter 65 is turned off while the first solenoid 40 is not driven. The state can be judged.

  Further, when the user performs an opening operation of the lid body 23 on the rice cooker body 11, the lid body 23 extends substantially upward as shown in FIG. 6 (B) through an inclined state shown in FIG. 6 (A). Rotate to position. Then, until the swing member 59 comes into contact with the stopper portion 58 of the holding portion 54, as shown in FIG. 6A, the detection portion 60 of the swing member 59 maintains a state of extending in the horizontal direction. In the open state of the lid 23, as shown in FIGS. 5C and 6B, the detection unit 60 of the swinging member 59 moves away from the detection area of the photo interrupter 65, and the photo interrupter 65 is Outputs an on signal. Therefore, as shown in FIG. 8B, the microcomputer 72 detects the state in which the photo interrupter 65 is outputting the on signal in the off state in which the first solenoid 40 is not driven, whereby the lid body 23 is detected. Can be determined.

  Furthermore, when the lid 23 is closed with respect to the rice cooker main body 11 and the engagement claw portion 33 and the engagement receiving portion 16 are in the normal engagement state, when the first solenoid 40 is locked, the moving member The swinging member 59 is positioned in the state shown in FIG. 5B and FIG. In this state, since the detection unit 60 of the swing member 59 is separated from the detection region of the photo interrupter 65, the photo interrupter 65 outputs an on signal. Therefore, as shown in FIG. 8B, the microcomputer 72 detects the state in which the photo interrupter 65 is outputting the ON signal in the ON state in which the first solenoid 40 is being driven. It can be determined that the portion 33 and the engagement receiving portion 16 are in a normal engagement state.

  When the lid 23 is closed with respect to the rice cooker body 11 and the engagement claw 33 and the engagement receiver 16 are in the abnormal engagement state, the first solenoid 40 is locked and moved. The swing member 59 is positioned in the state shown in FIG. 5D and FIG. In this state, the detection unit 60 of the swing member 59 has entered the detection area of the photo interrupter 65 (not in a state of being detached from the detection area), and thus the photo interrupter 65 is off. Therefore, as shown in FIG. 8B, the microcomputer 72 detects the state in which the photo interrupter 65 is turned off while the first solenoid 40 is being driven. It can be detected that the engagement receiving portion 16 is in an abnormal engagement state.

  Thus, the rice cooker of this embodiment can determine the open / closed state of the lid body 23 and the engaged state between the engagement claw portion 33 and the engagement receiving portion 16 with one sensor 65. Therefore, an increase in product cost can be suppressed and an increase in size can be prevented. Moreover, since the moving member 44 provided with the swing member 59 also serves as the driving means for the first solenoid 40 that opens and closes the relief valve 49, the number of parts can be reduced and the cost can be reduced. .

  Next, determination of the remaining amount of cooked rice in the rice cooker 10 by the microcomputer 72 will be described. In the following example, a rice cooking capacity of 5 Cup is used, but the same can be set even when the rice cooking capacity is changed.

  The microcomputer 72 stores a specific capacity extraction time ta for determining whether or not a specific capacity has been extracted in a RAM (not shown) which is a readable / writable storage means. And as shown to FIG. 9 (A), when the open time t of the cover body 23 is less than specific capacity extraction time ta, it is judged that there is no reduction of cooked rice. When the opening time t of the lid 23 is not less than the specific capacity take-out time ta and less than 2 ta, it is determined that the reduction of cooked rice is 0.5 cup. When t is 2 ta or more and less than 3 ta, the reduction amount is 1.0 cup, when t is 3 ta or more and less than 4 ta, the reduction amount is 1.5 cup, and when t is 4 ta or more and less than 5 ta, the reduction amount is 2.0 cup. When cup and t are 5ta or more and less than 6ta, the reduction amount is 2.5cup, when t is 6ta or more and less than 7ta, the reduction amount is 3.0cup, and when t is 7ta or more and less than 8ta, the reduction amount is If 3.5 cup, t is 8 ta or more and less than 9 ta, the decrease is 4.0 cup, if t is 9 ta or more but less than 10 ta, the decrease is 4.5 cup, if t is 10 ta or more but less than 11 ta, the decrease is Is determined to be 5.0cup.

  For example, as shown in FIG. 9B, if the set time ta of the specific capacity take-out time is 9 seconds, the first opening time t of the lid 23 may be 30 seconds exceeding the set time ta. The amount of cooked rice is not subtracted because of the stirring of cooked rice. In addition, when the opening time t of the second lid 23 is 15 seconds, it is determined that 0.5Cup has been reduced, and when the opening time t of the third lid 23 is 8 seconds, there is no decrease. In the case where the fourth opening time t of the lid body 23 is 28 seconds, it is determined that 1.5Cup (2.0Cup in total) has been reduced, and the fifth opening time t of the lid body 23 is 9 seconds. In this case, it is judged that the number has decreased by 0.5Cup (2.5Cup in total). Thus, based on the opening time t and the specific capacity extraction time ta, the reduction amount of cooked rice in the rice cooker 10 due to the opening and closing of the lid body 23 after the second time is determined. And the present rice residual amount is judged (predicted) by subtracting the amount of reduction | decrease for every opening / closing of the cover body 23 from the rice cooking capacity judged at the time of a rice cooking process.

  Next, the temperature control set temperature change according to the remaining amount of cooked rice in the rice cooker 10 by the microcomputer 72 will be described.

  First, in this embodiment, the rice cooking capacity is divided into three stages. In the case of a small amount of 0 Cup or more and 1 Cup or less, in the case of a medium amount exceeding 1 Cup and 3 Cup or less, and in each case of a full amount exceeding 3 Cup, detection of the temperature sensor 22 for the rice cooker is performed in the first heat treatment. The temperature control set temperature is changed based on the value. In addition, the target temperature control setting temperature (rice temperature) of cooked rice at the time of high temperature heat retention is 73 ° C., and the target temperature control setting temperature at the time of low temperature heat retention is 60 ° C.

  Here, as shown in FIG. 10 (A), when the temperature is kept high at a standard room temperature (20 ° C.), the actual rice temperature is 73.0 ° C. which is equal to the target temperature in the case of a small amount, and in the case of a medium amount. Is 73.5 ° C higher than the target temperature, and is 74.0 ° C higher than the target temperature in the case of full capacity. Similarly, when the temperature is kept high at low room temperature (5 ° C.) and high room temperature (35 ° C.), the actual rice temperature increases to 73 ° C. based on the detected value of the temperature sensor 22 for the rice cooker as the remaining amount of cooked rice increases. Despite temperature control (on / off control), high measured values are shown. Note that the same applies to the case where the temperature is kept low as shown in FIG. This is because when the remaining amount of cooked rice in the rice cooker 10 is small, the space volume formed in the upper portion is larger than that when the remaining amount of cooked rice is large. And when there is much space volume, the heating efficiency in which cooked rice is actually heated with respect to the heating amount by the trunk | drum heater 21 or the lid | cover heater 36 is bad. Moreover, the region of the rice cooker 10 facing the space acts to radiate the internal temperature. As a result, even when the remaining amount of cooked rice is small and large, the cooked rice temperature that is actually temperature-regulated is considered to be different even though the same temperature control set temperature is set.

  Therefore, in this embodiment, in order to set the actual heat retention temperature of the cooked rice to a target of 73 ° C. regardless of the capacity of the rice cooking pot 10, the temperature adjustment set temperature becomes lower than the target temperature as the remaining amount of cooked rice increases. It is set to be. And if it judges that the rice remaining amount in the rice cooking pan 10 decreased more than the specific capacity | capacitance by opening and closing of the cover body 23, it will comprise so that temperature control preset temperature may be raised. Specifically, when maintaining a high temperature at a standard room temperature (20 ° C.), the temperature adjustment temperature based on the detected value of the temperature sensor 22 for rice cooker is 73.0 ° C. for a small amount, and for a medium amount. 72.5 ° C, and 72.0 ° C when full. When the temperature is kept low at a standard room temperature (20 ° C.), the temperature adjustment set temperature is 60.0 ° C. for a small amount, 59.5 ° C. for a medium amount, and 59.0 ° C. for a full amount.

  In addition, the rice temperature during heat insulation changes with not only the residual amount of cooked rice in the rice cooking pan 10 but also the ambient room temperature. That is, as shown in FIG. 10 (A), in a state where the temperature is kept high at the standard room temperature (20 ° C.), the actual rice temperature is 73 ° C., which is the same as the target temperature, in the case of a small amount. The actual rice temperature at a low room temperature (5 ° C.) is as high as 74 ° C., and the actual rice temperature at a high room temperature (35 ° C.) is as low as 72 ° C. Similarly, when the medium and full amounts are kept at a high temperature, the actual rice temperature shows a higher actual measurement value as the room temperature is lower, and shows a lower actual measurement value as the room temperature is higher. Note that the same applies to the case where the temperature is kept low as shown in FIG. In this way, the lower the room temperature is, the higher the actual measured value of the rice temperature is because the detection value of the temperature sensor 22 for the rice cooker is lowered by cooling the metal rice cooker 10 at room temperature, so that the overheated state This is thought to be because of

  So, in this embodiment, in order to set the heat retention temperature of the cooked rice in the rice cooker 10 to the target 73 ° C. regardless of the room temperature, the room temperature (external temperature of the rice cooker 10) is lower than the reference (standard) temperature. The temperature control set temperature is set to be lower than the target temperature, and when the temperature control temperature is higher than the reference temperature, the temperature control set temperature is set to be higher than the target temperature. Specifically, when keeping a small amount at high temperature, the temperature setting temperature based on the value detected by the temperature sensor 22 for rice cooker is 73.0 ° C. for standard room temperature and 72.0 ° C. for low room temperature. In the case of high room temperature, the temperature is 74.0 ° C. When a small amount of heat is kept at a low temperature, the temperature setting temperature is 60.0 ° C. for standard room temperature, 59.0 ° C. for low room temperature, and 61.0 ° C. for high room temperature. Similarly, in the case of medium and full amounts, the temperature adjustment set temperature is set to be low when the room temperature is low and the temperature adjustment set temperature is set to be high when the room temperature is high. .

  Next, the control by the microcomputer 72 will be specifically described.

  First, in a state where the user has purchased a rice cooker, the microcomputer 72 is operating in a backup mode using a voltage of 3 V by a primary battery (not shown). In this state, when the commercial power supply is turned on by connecting the power cord, a zero cross pulse is input through the power supply circuit, and the operation starts with the voltage from the commercial power supply. And it waits until the switch of the operation panel 69 is operated, and when any operation is detected, the input process is performed.

  And if operation of a rice cooking switch is detected, as shown in FIG. 11, the microcomputer 72 will perform a 1st cover state test | inspection process first by step S1. In the first lid state inspection step, as described above, the open / close state of the lid body 23 is determined based on a signal from the photo interrupter 65 in the unlocked operation state where the first solenoid 40 is deenergized. When it is determined that the lid body 23 is in the open state, a flag for ending the rice cooking process is set, and when it is determined that the lid body 23 is in the closed state, the engagement receiving unit 16 is engaged. The engagement state of the pawl portion 33 is determined. In this engagement state determination, the engagement state between the engagement receiving portion 16 and the engagement claw portion 33 is determined based on a signal from the photo interrupter 65 as a lock operation state in which the first solenoid 40 is energized (ON). To do. And when it is judged that it is an abnormal engagement state, the flag for complete | finishing a rice cooking process is set, and when it judges that it is a normal engagement state, the flag for continuing a rice cooking process is set.

  When the first lid state inspection process is completed, in step S2, it is determined from the flag whether or not the state of the lid body 23 is normal. If the lid 23 is closed and the engagement receiving portion 16 and the engagement claw portion 33 are in the normal engagement state, the process proceeds to step S3. Further, when the lid body 23 is opened, or when the engagement receiving portion 16 and the engagement claw portion 33 are in an abnormal engagement state, the process proceeds to step S11.

  In step S3, energization of the induction heating coil 19 is started, and a preheating process is performed in which the temperature is adjusted so that the temperature of the rice cooker 10 becomes about 50 ° C.

  Then, when the preheating process is finished by elapse of a preset time, the second lid state inspection process is executed in step S4. This second lid state inspection step is substantially the same as the first lid state inspection step, and when it is determined that the lid state is normal, that is, when the lid body 23 is closed and is in a normal engagement state. When the process proceeds to step S5 without interrupting the power supply to the first solenoid 40 and it is determined that the lid state is abnormal, that is, when the lid body 23 is opened or is in an abnormal engagement state, The only difference is that the power supply to the first solenoid 40 is cut off and the process proceeds to step S5.

  In step S5, if the lid state is normal due to the flag, the process proceeds to steps S6 and S7, and if the lid state is abnormal, the process proceeds to step S11.

  In steps S6 and S7, the temperature raising process and the capacity determination process are performed in parallel. In the temperature raising step of step S6, the induction heating coil 19 is energized with 100% (full power) to boil the water containing the rice in the rice cooker 10. In this temperature raising step, the first solenoid 40 is maintained in an energized state, and the spherical member 52 rolls on the vent hole 53 to close the vent hole 53. As a result, the inside of the rice cooker 10 is gradually increased in pressure to be higher than atmospheric pressure. The capacity | capacitance discrimination | determination process of step S7 discriminate | determines the rice cooking capacity accommodated in the rice cooking pot 10 with the rising gradient of the temperature of the rice cooking pot 10 during heating.

  When the temperature raising process is completed, in step S8, the boiling control process is executed by controlling the induction heating coil 19 based on the input value of the lid temperature sensor 37. And if the preset time passes based on the discriminating rice cooking capacity and a boiling maintenance process is complete | finished, the energizing amount with respect to the induction heating coil 19 will be raised in step S9, and a cooking process will be performed.

  If the dry-up in the rice cooker 10 is detected based on the detected temperature in the cooking process, the unevenness process is executed in step S10. In this unevenness process, the energization to the first solenoid 40 is cut off, and the pressure input into the rice cooker 10 is released. Then, energization of the body heater 21 and the lid heater 36 is started, while the energization of the induction heating coil 19 is interrupted.

  When the preset time elapses, the rice cooking process is terminated when the unevenness process ends, and then the process proceeds to the first heat retaining process.

  On the other hand, if it is determined in the first and second lid state inspection steps that the state of the lid 23 is abnormal, in step S11, the rice cooking process is terminated, and in step S12, the piezoelectric buzzer is activated. Alternatively, a notification process for informing the user through the liquid crystal display panel is executed.

  Next, the 1st heat retention process performed following this rice cooking process is demonstrated. In addition, the 1st heat retention process and the 2nd heat retention process are medium quantity heat insulation states shown to FIG. 10 (A) and (B), without performing judgment of the rice remaining amount in the rice cooking pan 10, and the heating control accompanying it. The only difference is that the temperature is adjusted at.

  As shown in FIG. 12, the first heat retention process of the first embodiment performs the temperature adjustment process shown in steps S20 to S23 until the take-off switch of the operation panel 69 is operated, and then adjusts the temperature according to the setting. While performing a process, the rice remaining amount judgment process is performed.

  Specifically, the microcomputer 72 first reads the heat retention rank in step S20. This heat insulation amount rank is determined on the basis of the amount of rice cooked according to the amount of decrease after performing the rice remaining amount judgment step, which will be described later, based on the rice cooking capacity determined in the rice cooking process immediately after shifting to the heat insulation treatment. The

  Next, in step S21, the external temperature is detected by the external temperature sensor 71, and in step S22, the temperature adjustment set temperature is read and set based on the remaining amount of cooked rice in the rice cooker 10 and the external temperature as shown in FIG. . In step S23, 0 (setting completed) is input to the flag fa indicating whether or not the temperature adjustment set temperature is set (changed), and the process proceeds to steps S24 and S25.

  In steps S24 and S25, the temperature adjustment process and the rice remaining amount determination process are performed in parallel. The temperature adjustment process in step S24 controls the induction heating coil 19, the body heater 21 and the lid heater 36 on and off using the set sensor temperature as a threshold value, thereby controlling the heating so that the set temperature is reached. is there. In addition, the rice remaining amount judgment process of step S25 is demonstrated in detail later.

  When the temperature adjustment process and the remaining rice amount determination process in step S24 are completed, it is detected in step S26 whether or not the tear-off switch on the operation panel 69 has been operated. If the operation of the switch is not detected, the process proceeds to step S27, and it is determined whether or not the temperature adjustment set temperature needs to be changed based on whether 1 (reset required) is input to fa. If fa is 1, the process proceeds to step S20. If fa is 0, the process proceeds to steps S24 and S25. Further, when the operation of the tear switch is detected, the heating by the induction heating coil 19, the body heater 21 and the lid heater 36 is stopped, and the process proceeds to step S28. 0 is input (reset) to the flag fb indicating whether it is open or not, and a transition is made to the standby mode.

  Next, the process for determining the remaining amount of cooked rice in step S25 will be specifically described.

  In this cooked rice remaining amount determining step, as shown in FIG. 13, the microcomputer 72 first detects whether or not the lid body 23 is opened based on a signal from the photo interrupter 65 in step S25-1. If the opening of the lid body 23 is detected, the process proceeds to step S25-2. If the opening of the lid body 23 is not detected, the process directly returns. In this state, energization to the first solenoid 40 is interrupted (step S10).

  When the opening of the lid body 23 is detected, it is determined in step S25-2 whether or not the lid body 23 is opened for the first time after the transition to the heat retaining process, based on whether 1 is input to fb. To do. If fb is 0, that is, if it is the first release after the transition, the process proceeds to step S25-3, 1 is input to fb, and the process returns. If fb is 1, that is, if it is the second or more opening after the transition, the process proceeds to step S25-4.

  In step S25-4, a counter for measuring the opening time t is reset and started, and then in step S25-5, the process waits until it is detected that the lid body 23 is closed by a signal from the photo interrupter 65. .

  And if blockade of lid 23 is detected, after stopping measurement of open time t at Step S25-6, it will judge the amount of decrease of cooked rice in rice cooking pot 10 at Step S25-7 like FIG. To do. Thereafter, in step S25-8, the remaining amount of cooked rice is calculated based on the rice cooking capacity and the amount of decrease, and whether or not the heat retention amount rank needs to be changed as shown in FIG. 10 based on the predicted remaining amount of cooked rice. to decide. If it is necessary to change the heat insulation amount rank, the process proceeds to step S25-9, and 1 (reset required) is input to fa in order to change the temperature adjustment set temperature, and the process returns. As a result, the temperature adjustment setting process is executed through steps S27 to S20. On the other hand, if it is not necessary to change the heat insulation amount rank, the process directly returns.

  Thus, in this embodiment, the remaining amount of cooked rice in the rice cooker 10 is determined based on the cooked rice capacity determined in the cooked rice process, the opening time t of the lid body 23, and the preset specific capacity extraction time. . And when a user tries to cook rice in a bowl, the amount and time are substantially proportional. Therefore, according to the configuration of the present embodiment, the remaining amount of cooked rice in the rice cooker 10 can be determined substantially accurately.

  Moreover, in this embodiment, the heating control which controls temperature according to the estimated remaining amount of cooked rice is changed. Specifically, when it is determined that the remaining amount of cooked rice in the rice cooking pot 10 has decreased, the temperature adjustment set temperature is raised, so that the actual temperature of the cooked rice can be maintained at the target temperature. Therefore, the heat retention effect as set in advance, that is, the drying of cooked rice and the growth of spoilage bacteria can be prevented.

  Moreover, in this embodiment, since it is judged that the opening / closing of the cover body 23 of the first time after shifting from a rice cooking process to a heat retention process is "unraveling", and the rice is not decreased, Can prevent misidentification of quantity. Furthermore, in this embodiment, the amount of reduction of cooked rice is determined based on one opening time t by opening and closing the lid body 23 and the specific capacity extraction time ta. Therefore, for example, for the purpose of confirming the remaining amount of cooked rice in the rice cooker, the opening time t when the lid 23 is opened for only a short time can be excluded. As a result, misidentification of the remaining amount of cooked rice can be further prevented.

  14 to 16 show control by the microcomputer 72 of the rice cooker of the second embodiment. The second embodiment is greatly different from the first embodiment in that the set time ta of the specific capacity take-out time can be changed (learned) according to the actual usage situation of the user.

  Specifically, the microcomputer 72 of the second embodiment serves as a set time changing unit that calculates and changes the set time ta of the specific capacity extraction time. The microcomputer 72 as the set time changing means stores the time t when the lid 23 is opened until the heat retaining process is stopped by the operation of the replacement switch of the operation panel 69, and the opening time t when the heat retaining process ends. Is accumulated. Thereafter, based on the accumulated time and the rice cooking capacity determined by the rice cooking process, the rice cooking capacity is divided from the accumulated time. Then, whether or not the change is necessary is determined based on whether or not the calculated value is longer than the currently set time ta. In addition, in the present embodiment, the setting time ta of the specific capacity take-out time is changed only when the calculation result in the heat retention process continuously matches the preset equivalent comparison condition twice or more (for example, three times) continuously. Yes.

  Here, the “equivalent comparison condition” of the present embodiment is a size comparison with respect to the execution menu of the rice cooking process, the rice cooking capacity determined by the rice cooking process, and the current set time ta. If all the conditions match three times and the calculated value is lower than the current set time ta, the set time ta is decreased by 1 second, and if the calculated value is higher than the current set time ta, the set time ta is set to 1 second. Do more. That is, as shown in FIG. 14, when the current set time ta is 9 seconds and the calculated value is less than 9 seconds, the set time ta is changed to 8 seconds. Conversely, if the calculated value exceeds 9 seconds, the set time ta is changed to 10 seconds. In addition, after the change, the condition comparison is performed in the same manner, and when the calculated value is lower than the current set temperature, it is sequentially decreased by 1 second, while when the calculated value is higher than the current set temperature, it is sequentially increased by 1 second. To do.

  Next, the control by the microcomputer 72 of the second embodiment will be specifically described. In addition, since rice cooking processing is the same as 1st Embodiment, detailed description is abbreviate | omitted.

  The heat insulation process by the microcomputer 72 of the second embodiment is as shown in FIG. This heat retention process is different only in that a specific capacity extraction time changing step is added as step S29 after resetting fb in step S28 of the first embodiment. Also, the cooked rice remaining amount determining step of the second embodiment is different only in that it is stored in the RAM after stopping the counter of the opening time t in step S25-6.

  In the specific capacity take-out time changing step, as shown in FIG. 16, the microcomputer 72 first determines whether or not the heat retention time is less than 24 hours in step S29-1. Then, when the heat retention time is less than 24 hours, the process proceeds to step S29-2, and when the heat retention time is 24 hours or more, the process returns. That is, the situation where the heat retention process is performed for 24 hours or more after cooking rice is an extremely rare situation due to the user forgetting to turn it off. Therefore, in this embodiment, it is set as the structure which does not consider the open time t of the cover body 23 in the heat retention process over 24 hours.

  In step S29-2, all the open times t (t1, t2,..., Tn) stored in step S25-6 are accumulated (added), and then in step S29-3, executed before the first heat retaining process. Read the capacity determined by the rice cooking process. In step S29-4, the actual time required to take out the specific capacity (0.5 Cup) is calculated and stored.

  Next, in the step S29-5, the past (twice) rice cooking conditions are read, and in a step S29-6, it is determined whether or not all the rice cooking conditions match. If they match, the process proceeds to step S29-7. If they do not match, the process directly returns. Note that the storage capacity in the RAM is only for the past three times, and when new information is stored, the oldest information is deleted. Incidentally, the conditions for determining that they match, such as the number of times and whether or not they are continuous, can be changed as desired. Of course, it is good also as a structure which progresses to step S29-7, without performing step S29-5, 6, ie, without performing equivalent comparison with the past rice cooking conditions.

  In step S29-7, it is compared whether or not all the calculated values are lower than the current set time ta. If all the calculated values are lower than the current set time ta, the process proceeds to step S29-8, and the set time ta of the specific capacity take-out time is subtracted by 1 second and the process returns. If even one of the calculated values is higher than the current set time ta, the process proceeds to step S29-9.

  In step S29-9, it is compared whether or not all the calculated values are higher than the current set time ta. If all the calculated values are higher than the current set time ta, the process proceeds to step S29-10, and the set time ta of the specific capacity take-out time is added by 1 second and the process returns. If even one of the calculated values is lower than the current set time ta, the process returns without changing the set time ta.

  Thus, the rice cooker of 2nd Embodiment sets the specific capacity | capacitance taking-out time based on the total opening time t and the rice cooking capacity of the cover body 23 in the 1st heat retention process performed once after the rice cooking process. It is set as the structure which changes ta. Therefore, it is possible to obtain the same operation and effect as in the first embodiment, and it is possible to reliably set the specific capacity take-out time according to different actual usage situations in each home. As a result, misidentification of the remaining amount of cooked rice can be reliably prevented.

  FIG. 17 shows the control by the microcomputer 72 of the rice cooker of the third embodiment. In the third embodiment, similar to the second embodiment, the set time ta of the specific capacity take-out time can be changed at the end of the first heat retaining process, and the amount of rice reduced due to the opening / closing time t of the lid 23 can be changed. The second embodiment is different from the second embodiment in that the determination method is changed.

  Specifically, in the first and second embodiments, the amount of decrease is determined based on one opening time t of the lid body 23 and the set time ta of the set specific capacity take-out time. In the embodiment, the opening time t for each opening and closing of the lid body 23 is integrated as needed, and the reduction amount of the cooked rice is determined based on the integrated opening time and the specific capacity extraction time. In addition, this integrated open time may be configured to add the individually opened open time t, or may be configured to continuously count without clearing the previous open time.

  That is, when the set time ta of the specific capacity take-out time is 9 seconds, even if the first opening time t of the lid 23 is 30 seconds exceeding the set time ta, it is due to the stirring of cooked rice. The amount of cooked rice is not subtracted. Further, when the opening time t of the lid 23 for the second time is 15 seconds, it is determined that 0.5Cup has decreased. When the opening time t of the lid 23 for the third time is 8 seconds, the total opening time is 23 seconds, so it is determined that the total take-out capacity is 1.0 Cup. When the opening time t of the lid 23 for the fourth time is 28 seconds, the total opening time is 51 seconds, so it is determined that the total take-out capacity is 2.5 Cups. When the opening time t of the fifth lid 23 is 9 seconds, the total opening time is 60 seconds, so it is determined that the total take-out capacity is 3.0 Cup. And the present rice residual amount is judged (predicted) by subtracting the amount of reduction | decrease for every opening / closing of the cover body 23 from the rice cooking capacity judged at the time of a rice cooking process.

  Further, when the first heat retaining process is ended by operating the take-off switch of the operation panel 69, the specific capacity in one first heat retaining process is based on the rice cooking capacity and the total opening time as in the second embodiment. The set time ta of the extraction time is changed.

  The rice cooker of 3rd Embodiment comprised in this way can acquire the effect | action and effect similar to 2nd Embodiment. In addition, even in the first heat retaining process being performed, it is possible to suppress misperception of the remaining amount of cooked rice due to the time required to “good” cooked rice that is different for each household.

  Note that, as in the third embodiment, the determination of the amount of decrease based on the total opening time and the specific capacity extraction time is not limited to the configuration in which the specific capacity extraction time can be changed, as in the first embodiment. In addition, the configuration in which the specific capacity extraction time cannot be changed is also applicable.

  18 and 19 show control by the microcomputer 72 of the rice cooker of the fourth embodiment. In the fourth embodiment, the microcomputer 72 serves as a stirring determination unit that determines whether or not the first opening / closing of the lid 23 after shifting from the rice cooking process to the first heat retaining process is for stirring. It is configured to make. And when it is judged that it is the object for stirring, it does not judge that the cooked rice has decreased from the rice cooking pot 10 regardless of the opening time t, and when it is judged that it is not intended for stirring, the opening The remaining amount of cooked rice is determined based on the time t and the specific capacity extraction time.

  In the present embodiment, the microcomputer 72 serving as the agitation determination means determines whether or not the purpose of the agitation is based on whether or not the opening time t of the lid 23 exceeds a preset agitation determination time (for example, 20 seconds). It is set as the structure which judges. That is, as shown in FIG. 18 (A), when the opening time t of the lid 23 is 30 seconds exceeding the stirring determination time, it is determined that the lid 23 is opened for the purpose of stirring. The opening time t is not taken into account, and the remaining amount of cooked rice is not reduced. Also, as shown in FIG. 18 (B), when the opening time t of the lid 23 is 10 seconds, which is equal to or less than the stirring determination time, the purpose is not to stir but to “good”. In view of this, the release time t is taken into account, and it is determined that 0.5 cup reduction has occurred. The agitation determination time may be set differently depending on the rice cooking capacity.

  Next, the control by the microcomputer 72 of the fourth embodiment will be specifically described. In addition, the rice cooking process of 4th Embodiment is the same as 1st Embodiment, and the 1st heat retention process is the same as 1st Embodiment shown in FIG. 12, or 2nd Embodiment shown in FIG. That is, as in the fourth embodiment, whether or not the first opening / closing of the lid body 23 is taken into account depends on the first embodiment in which the specific capacity extraction time is not changed, the second in which the specific capacity extraction time is changed. It can be applied to any of the third embodiments. And in 4th Embodiment, in each 1st heat retention process, only the rice remaining amount judgment process of step S25 is different.

  Specifically, in the cooked rice remaining amount determining step of the fourth embodiment, as shown in FIG. 19, the microcomputer 72 first determines whether or not the lid 23 has been opened by a signal from the photo interrupter 65 in step S30. To detect. If the opening of the lid body 23 is detected, the process proceeds to step S31. If the opening of the lid body 23 is not detected, the process directly returns.

  In step S31, it is determined whether or not the lid 23 for the first time after the transition to the heat retaining process is opened depending on whether or not 1 is input to fb. If fb is 0, the process proceeds to step S32. If fb is 1, the process proceeds to step S36.

  In step S32, after 1 is input to fb, in step S33, a stirring determination step is executed. In this stirring determination step, the opening time until the lid 23 is closed is detected, and it is determined whether or not the opening is intended for stirring by comparing with the stirring determination time. If it is determined in step S34 that the stirring is performed, the process returns as it is. If it is determined that the stirring is not performed, the process proceeds to step S35, the opening time t is stored, and the process proceeds to step S39.

  On the other hand, in step S36, the counter for measuring the opening time t is reset and started, and then in step S37, the process waits until it is detected that the lid body 23 is closed by the signal from the photo interrupter 65. When the closure of the lid 23 is detected, the measurement of the opening time t is stopped and stored in step S38, and then the process proceeds to step S39.

  In step S39, the reduction amount of the cooked rice is determined based on the opening time t of the lid body 23 and the specific capacity extraction time stored in step S35 or step S38. Thereafter, in step S40, the remaining amount of cooked rice is calculated based on the rice cooking capacity and the amount of decrease, and it is determined whether or not the heat retention rank needs to be changed based on the predicted remaining amount of cooked rice. If it is necessary to change the heat insulation amount rank, the process proceeds to step S41, and 1 is input to fa in order to change the temperature adjustment set temperature, and the process returns. If there is no need to change the heat insulation amount rank, the process directly returns.

  As described above, in the rice cooker of the fourth embodiment, when it is determined whether the first opening of the lid body 23 is for the purpose of stirring, and when it is determined that the purpose is for the purpose of stirring. Is configured such that the opening time t is added to the reduction of cooked rice when it is determined that the opening time t is not intended for stirring and is not intended for stirring. Therefore, the misrecognition of the remaining amount of cooked rice can be prevented more reliably.

  20A and 20B show control by the microcomputer 72 of the rice cooker of the fifth embodiment. In the fifth embodiment, the microcomputer 72 refers to whether the opening and closing of the lid body 23 is an action of “stirring”, an action of “good”, or “stirring” and “good”. The fourth embodiment is different from the fourth embodiment in that it is determined whether both actions are performed. And when it is judged that the purpose is “stirring”, it is not judged that the cooked rice has been reduced from the rice cooking pot 10 regardless of the opening time t, and is intended to be “good”. When it is determined that there is, the remaining amount of cooked rice is determined based on the opening time t and the specific capacity extraction time, and when it is determined that both “stirring” and “good”, The configuration is such that the remaining amount of cooked rice is determined based on the opening time t and the specific capacity extraction time.

  Specifically, the microcomputer 72 as the stirring determination unit of the fifth embodiment determines whether or not the opening time t of the lid body 23 is within a preset stirring determination time zone (for example, 20 seconds to 50 seconds). Therefore, it is determined whether the purpose is “stirring” and / or “good”. That is, as shown in FIG. 18A, when the opening time t of the lid 23 is 30 seconds within the stirring determination time zone, it is determined that the lid 23 is opened for the purpose of “stirring”. The opening time t does not take into account and does not reduce the remaining amount of cooked rice. Further, as shown in FIG. 18B, when the opening time t of the lid 23 is 10 seconds less than the lower limit value of the stirring determination time zone (second stirring determination time for determining whether stirring is performed). Is determined not to aim at “stirring” but to be “good”, and to reduce by 0.5 Cup by taking into account its opening time t. Furthermore, as shown in FIG. 20 (A), in 60 seconds when the opening time t of the lid 23 exceeds the upper limit value of the stirring determination time zone (first stirring determination time for determining whether stirring of cooked rice is completed). In some cases, it is determined that the purpose is “good” after “stirring” of the cooked rice, and the upper limit (50 seconds) of the stirring determination time zone is subtracted from the opening time t, Judging that the act of “Yoso” was performed, decrease by 0.5 cup. Similarly, as shown in FIG. 20 (B), when the opening time t of the lid 23 is 70 seconds exceeding the stirring judgment time zone, the action of “good” is performed for 20 seconds after “stirring” of cooked rice. Decrease by 1.0Cup. Of course, the agitation determination time zone (first and second agitation determination times) may be set differently depending on the rice cooking capacity, as in the fourth embodiment.

  In the rice cooker of the fifth embodiment configured as described above, whether or not the opening time ta of the lid body 23 is within the stirring determination time zone as described above in the stirring determination step in step S33 of the fourth embodiment. Whether or not the purpose is agitation is determined. Then, in the case of including the action “Yoshio” and the action, the reduction amount of the cooked rice is determined. Therefore, the misrecognition of the remaining amount of cooked rice can be prevented more reliably.

  In addition, the rice cooker of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in each embodiment, the lid state detection means for detecting opening and closing of the lid body 23 is configured by the swing member 59 and the photo interrupter 65, but may be configured by a magnet and a reed switch, or may be configured by a micro switch. Also good. In other words, any configuration can be applied as long as the opening and closing of the lid 23 can be distinguished and detected.

  Further, in each embodiment, as shown in FIG. 9, the set time (specific capacity take-out time) ta for determining that the time has been reduced by the opening time t of one lid 23 is the same for 0.5 Cup and 1.0 Cup or more. However, the setting time of 1.0 Cup or more may be different. That is, as shown in FIG. 21A, when the opening operation time tα required for opening the lid body 23 and the closing operation time tβ required for closing the lid body 23, these operation times (tα + tβ) The time tγ obtained by subtracting is the time necessary to actually “define” the cooked rice. Therefore, the setting (judgment) time of 1.0 Cup may be a time obtained by adding the second specific capacity extraction time tγ to the first specific capacity extraction time ta as shown in FIG. That is, when the opening time t of the lid 23 is less than the specific capacity extraction time ta, it is determined that there is no decrease in cooked rice. If the opening time t of the lid 23 is equal to or longer than the specific capacity extraction time ta and less than ta + tγ, it is determined that the reduction of cooked rice is 0.5 cup. When t is ta + tγ or more and less than ta + 2tγ, the reduction amount is 1.0 cup, when t is ta + 2tγ or more and less than ta + 3tγ, the reduction amount is 1.5 cup, and when t is ta + 3tγ or more but less than ta + 4tγ, the reduction amount is 2.0. When cup and t are ta + 4tγ or more and less than ta + 5tγ, the reduction amount is 2.5cup, when t is ta + 5tγ or more and less than ta + 6tγ, the reduction amount is 3.0cup, and when t is ta + 6tγ or more but less than ta + 7tγ, the reduction amount is 3.5 cup, when t is greater than ta + 7tγ and less than ta + 8tγ, the decrease is 4.0cup, when t is less than ta + 8tγ and less than ta + 9tγ, the decrease is 4.5cup, and when t is greater than ta + 9tγ and less than ta + 10tγ, the decrease is Is determined to be 5.0cup. Of course, the operation times tα and tβ are set in consideration of the detection time by the lid state detection means.

  In the second embodiment, the calculated value calculated based on the total opening time t and the rice cooking capacity in the first heat treatment is only compared with the current setting time ta of the specific capacity extraction time, and matches the condition. In this case, the subtraction or addition is performed every second, but an average value of a plurality of calculation values may be set as the specific capacity extraction time.

  Further, in the fourth and fifth embodiments, the agitation determination means is constituted by the microcomputer 72, and it is determined whether or not the agitation is performed from the opening time t of the lid 23 and the agitation determination time or the agitation determination time zone set in advance. Although it was set as a structure, the human body detection sensor which detects that the person touched the external body of the rice cooker main body 11 by the change of an electrostatic capacitance etc. is provided, and it is stirring based on the signal of this human body detection sensor. It is good also as a structure to judge. That is, when the user stirs the cooked rice in the rice cooker 10, a large rotational force is applied to the rice cooker body 11, and the shoulder body 14 in the rice cooker body 11 is often held by hand. Therefore, when the human body detection sensor outputs a signal indicating that the human body is touching the exterior body, it is determined that stirring is performed, and the opening time of the lid body 23 is not considered in the reduction of cooked rice. Constitute. In addition, when the rice is “good”, the rice cooker main body 11 is not touched by the user because the rice bran and the bowl are usually held in both hands. Therefore, when the human body detection sensor does not output a signal that means that the human body is touching, or when no signal is output, it is determined that stirring is not performed, and based on the opening time of the lid body 23 To reduce the remaining amount of cooked rice. Of course, the stirring determination means can be changed as desired as long as it can detect a change in the rice cooker accompanying stirring.

  Then, as in the fourth and fifth embodiments, the configuration of the agitation determination means for determining whether or not the opening of the first lid body 23 that has shifted to the heat retaining process is intended for agitation is the same as that of the first embodiment. Thus, the present invention can be applied to both the configuration in which the setting time ta of the specific capacity extraction time is not changed and the configuration in which the setting time ta of the specific capacity extraction time is changed as in the second and third embodiments. And especially by employ | adopting to 2nd and 3rd embodiment, the misidentification of the remaining amount of cooked rice can be suppressed further.

  Moreover, in the said embodiment, it was set as the structure which judges the rice remaining amount in the rice cooking pot 10 whenever it detects the opening / closing of the cover body 23, However, When opening / closing of the predetermined number of times, such as 2 times, is detected, It may be configured to determine the remaining amount of cooked rice. In this case, when not determining the remaining amount of cooked rice, it is preferable to store the opening time t of the lid 23 and to determine by integrating the opening time t stored when determining the remaining amount of cooked rice.

  DESCRIPTION OF SYMBOLS 10 ... Rice cooker, 11 ... Rice cooker main body, 19 ... Induction heating coil (heating means), 21 ... Body heater (heating means), 22 ... Temperature sensor for rice cooking pot (pan temperature detecting means), 23 ... Lid, 36 ... lid heater (heating means), 37 ... lid temperature sensor (pan temperature detecting means), 44 ... moving member, 54 ... holding part, 59 ... swinging member (lid state detecting means), 65 ... photo interrupter (lid) (State detection means), 69 ... operation panel, 71 ... external temperature sensor (external temperature detection means), 72 ... microcomputer (control means, capacity determination means, count means, heat insulation amount determination means, stirring determination means, set time change means) .

Claims (11)

A rice cooker body that houses the rice cooker, a heating means that heats the cooked rice and cooked rice in the rice cooker, a lid that is attached to the rice cooker body so as to be openable and closable, and controls the heating means. In the rice cooker equipped with a control means for executing the rice cooking process and subsequently performing the heat retention process, and a capacity determining means for determining the rice cooking capacity during the rice cooking process,
Lid state detection means for detecting the open / closed state of the lid;
Counting means that starts counting the opening time when detecting the opening of the lid based on the signal of the lid state detecting means during the heat retaining process, and stops counting the opening time when detecting the closure of the lid,
Based on the rice cooking capacity determined during the rice cooking process by the capacity determination means, the opening time counted by the counting means during the heat retention process executed following this rice cooking process, and the set specific capacity extraction time, A heat insulation amount judging means for judging the remaining amount of cooked rice in the rice cooking pan,
The said control means changes the heating control by the heat retention process by the said heating means according to the rice remaining amount estimated by the said heat retention amount judgment means, The rice cooker characterized by the above-mentioned.   The said heat insulation amount judgment means does not judge that the first open / close of the lid after shifting from the rice cooking process to the heat insulation process does not determine that the cooked rice has decreased from the rice cooker regardless of the opening time. Item 9. A rice cooker according to item 1. An opening and closing of the first lid after shifting from the rice cooking process to the heat retaining process is provided with a stirring judgment means for judging whether or not the rice in the rice cooking pot is stirred,
When the heat insulation amount determination means determines that the stirring determination means is stirring, it does not determine that the cooked rice has decreased from the rice cooker regardless of the opening time, and when the stirring determination means determines that the stirring is not stirring, the heat release amount determination means The rice cooker according to claim 1, wherein the remaining amount of cooked rice is determined based on time.   4. The rice cooker according to claim 3, wherein the agitation determination unit determines whether or not the agitation is based on whether or not the opening time of the lid has exceeded a preset agitation determination time. 5. Depending on whether or not the opening time of the lid exceeded the preset first agitation judgment time in the first opening and closing of the lid after the transition from the rice cooking process to the heat retaining process, the rice in the rice cooker A stirring judgment means for judging whether or not stirring has been completed is provided,
When the opening time of the lid exceeds the first stirring determination time, the heat insulation amount determination means determines the remaining amount of cooked rice based on a time obtained by subtracting the first stirring determination time from the opening time. Item 9. A rice cooker according to item 1. The agitation determination means determines whether or not the agitation is based on whether or not the opening time of the lid has exceeded a preset second agitation determination time,
If the opening time of the lid is less than the second stirring determination time, determine the remaining amount of cooked rice based on the opening time,
If the opening time of the lid is not less than the second agitation judgment time and not more than the first agitation judgment time, it is judged that only stirring is performed, and it is not judged that the cooked rice has decreased from the rice cooking pot regardless of the opening time. The rice cooker of Claim 5 characterized by these.   The heat insulation amount judging means judges a reduction amount of cooked rice based on one opening time by opening and closing the lid and a specific capacity take-out time, and the cooked rice is determined from this reduction amount and the rice cooking capacity judged by the capacity judging means. The rice cooker according to any one of claims 1 to 6, wherein the remaining amount of cooked rice in the pan is determined.   The heat insulation amount determining means integrates the opening time for each opening and closing of the lid, determines a reduction amount of cooked rice based on the integrated opening time and a specific capacity take-out time, and determines the reduction amount and the capacity determination means. The rice cooker according to any one of claims 1 to 6, wherein the remaining amount of cooked rice in the rice cooker is determined from the cooked rice cooking capacity.   By the time when the heat insulation process is stopped by the operation of the operation panel, the lid opening time counted by the counting means is integrated, and the specific capacity extraction time is determined based on the integrated time and the rice cooking capacity by the capacity determining means. The cooker according to any one of claims 1 to 8, further comprising setting time changing means for calculating and changing.   The set time changing means changes the set time of the specific capacity take-out time only when the calculation result in the heat retention process matches the preset equivalent comparison condition two or more preset times. The rice cooker according to claim 9. By heating the cooked rice in the rice cooking pot by controlling the heating means by the control means, and then performing the rice cooking process, followed by heating the cooked rice in the rice cooker and executing the heat treatment, There,
During the rice cooking process, the rice cooking capacity is determined by the capacity determination means,
During the heat retention process to be subsequently executed, the lid state detection means monitors the opening and closing of the lid body,
When the lid state detection means detects the opening of the lid body, the counting means counts the opening time, and when the lid state detection means detects the closure of the lid body, after stopping the counting of the opening time by the counting means,
Based on the cooked rice capacity determined by the capacity determining means, the opening time counted by the counting means, and the set specific capacity extraction time, the heat insulation amount determining means determines the remaining amount of cooked rice in the rice cooking pan. ,
The said control means changes the heating control by the said heating means according to the rice residual amount estimated by the said heat retention amount determination means, The heat retention control method of the rice cooker characterized by the above-mentioned.

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