JP5488252B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker used for general household or business use.

  Conventionally, this type of rice cooker uses a microcomputer to detect changes in temperature while measuring the temperature of the food, and when an abnormality is detected in the sensor, it controls the operation of the heater etc. so that rice can be cooked safely. (For example, refer to Patent Document 1).

  FIG. 7 shows a block diagram of a conventional rice cooker described in Patent Document 1. As shown in FIG.

  As shown in FIG. 7, a pot 201 for putting rice and water, a heating means 202 for heating the pot 201, a temperature detecting means 203 for detecting the temperature in the pot 201, and detecting the boiling of water in the pot 201. The boiling detection means 204, the first control storage means 205 that stores the process of controlling the heating means 202 and performing the normal rice cooking operation, and the process of controlling the heating means 202 when the rice cooking operation is abnormal. The second control storage means 206 and the process switching means 207 are stored.

  The process switching unit 207 receives an input from the boiling detection unit 204, and performs a first control on the process of the rice cooking operation when the temperature detected by the temperature detection unit 203 falls below a predetermined temperature after the water in the pot 201 has boiled. It moves to the 2nd control memory | storage means 206 from the memory | storage means 205, and it is comprised so that it may become a fixed weak heat power or a heat power may be stopped.

JP 9-308571 A

  However, in the above-described conventional configuration, when the temperature detected by the temperature detecting means falls below a predetermined temperature after the water in the pan has boiled, the thermal power is stopped or the charcoal is burned by making it a constant weak thermal power up to the cooking temperature. Although it can be prevented and cooked safely, foreign substances can be detected only after boiling has been detected, and there are problems in preventing scorch and safety.

  The present invention solves the above-mentioned conventional problem, and detects foreign matter before the water in the pan boils even if the foreign matter is interposed between the pan temperature detector and the pan and the temperature detection does not work well. Therefore, it aims at providing a safe rice cooker.

In order to solve the above-mentioned conventional problems, the rice cooker of the present invention includes a pot housed in a rice cooker body, a heating device that heats the bottom of the pot, and a pot temperature detection that detects the temperature of the pot. A control unit that controls the heating device from the temperature detected by the pan temperature detection unit and performs a rice cooking operation from the temperature detected by the pan temperature detection unit. , upon heating control to keep the predetermined first water temperature in the water process performed immediately after the start cooking, the pot temperature variation width of the detection portion of the detection temperature reaches a predetermined at a normal temperature range is less than the first temperature range In the following cases, after the heating is stopped, a display indicating that there is an abnormality in the display unit is performed.

As a result, it is possible to detect in the water absorption process immediately after cooking that there is a foreign object between the pan temperature detection unit and the pan, and even if the temperature detection does not work well due to the foreign material in the pan temperature detection unit, Foreign matter can be detected before the water boils, and scorching and abnormal heat generation can be prevented.

  In the rice cooker of the present invention, even when a foreign substance enters between the pan temperature detection part and the pan, and the detection temperature cannot be accurately detected, the presence of foreign matter can be detected in the water absorption process immediately after cooking, so the inside of the pan at the time of detection It is still in the state of rice and water, and it can prevent scorching and abnormal heat generation without boiling.

The block diagram of the rice cooker in Embodiment 1 of this invention. Sectional drawing of the rice cooker in Embodiment 1 of this invention. The figure which shows the sequence of the rice cooker in Embodiment 1 of this invention. The figure which shows the sequence of the rice cooker in Embodiment 2 of this invention. The figure which shows the sequence of the rice cooker in Embodiment 3 of this invention. The figure which shows the sequence of the rice cooker in Embodiment 4 of this invention. Block diagram of a conventional rice cooker

1st invention, the pot accommodated inside the rice cooker main body, the heating apparatus which heats the bottom part of the said pan, the pan temperature detection part which detects the temperature of the said pan, and rice cooking did not complete | finish normally. And a control unit that controls the heating device from the temperature detected by the pan temperature detection unit and performs a rice cooking operation, the control unit in a water absorption process performed immediately after the start of rice cooking At the time of heating control to maintain the predetermined first water absorption temperature, when the variation width of the detected temperature of the pan temperature detection unit is equal to or smaller than the first temperature width smaller than the predetermined temperature width at normal time , the display is performed after heating is stopped. By detecting that there is an abnormality in the part, even if a foreign object enters between the pan temperature detection part and the pan, the detected temperature cannot be detected accurately. Because it can be in the pot at the time of detection It is a state of rice and water, it is possible to prevent scorching or overheating without boiling.

In the second invention, in particular, the control unit of the first invention has a variation width of the detected temperature of the pan temperature detecting unit during the heating control for maintaining the predetermined first water absorption temperature in the water absorption process . When the temperature is less than a second temperature range that is greater than the temperature range of 1 and less than the predetermined temperature range at the normal time, by performing heating control that maintains a predetermined second water absorption temperature lower than the first water absorption temperature, Even when a foreign object enters between the detection unit and the pan and the detected temperature cannot be detected accurately, the presence of foreign matter is detected in the water absorption process immediately after cooking rice, and the pot is detected from the middle of the water absorption process, which is the first process of rice cooking. Since the water absorption process can be carried out at a temperature corrected, it is possible to cook rice with the optimum heating power necessary to cook deliciously while preventing scorching and abnormal heat generation.

According to a third aspect of the present invention, in particular, the control section of the second aspect of the present invention has a variation range of the detected temperature of the pan temperature detecting section during the heating control that maintains the predetermined first water absorption temperature in the water absorption process . When the temperature is less than the second temperature width that is larger than the temperature width of 1 and smaller than the predetermined temperature width at the normal time, the predetermined second water absorption temperature is varied according to the temperature variation width, thereby detecting the pot temperature. Even if a foreign object enters between the pan and the pan, and the detected temperature cannot be detected accurately, the presence of the foreign material is detected in the water absorption process immediately after rice cooking, and the pot detection temperature from the middle of the water absorption process that is the first process of rice cooking Since the water absorption process can be carried out at a more accurate water absorption temperature by finely detecting and correcting the deviation temperature of the detection temperature of the pan temperature detection unit due to foreign matter, it is delicious while preventing burns and abnormal heat generation. It is possible to cook the rice to give the best of firepower needed to Kutame.

According to a fourth aspect of the invention, in particular, the control section of the third aspect of the present invention has a variation range of the detected temperature of the pan temperature detecting section during the heating control that maintains the predetermined first water absorption temperature in the water absorption process . When the temperature is equal to or less than the second temperature width that is larger than the temperature width of 1 and smaller than the predetermined temperature width at the normal time, the predetermined second water absorption temperature is varied according to the temperature variation width, and the cooking temperature is normal By performing the cooking operation at a lower temperature than the time, even if a foreign substance enters between the pan temperature detection part and the pan and the detected temperature cannot be detected accurately, the presence of foreign matter is detected in the water absorption process immediately after cooking. In the middle of the water absorption process, which is the first process of cooking rice, the water detection process is performed at a more accurate water absorption temperature by finely detecting and correcting the deviation width of the detection temperature of the pot temperature detection part due to foreign matter. It is possible to implement, it is possible to cook rice giving optimal thermal needed to cook delicious thereby preventing scorching or overheating by reducing the temperature was raised cooking.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram of a rice cooker according to the first embodiment of the present invention, and FIG. 2 is a sectional view of the rice cooker according to the first embodiment of the present invention.

  As shown in FIG. 1, a pot 1 containing rice and water is heated by a heating device 3, the temperature of the pot 1 is detected by a pot temperature detection unit 4, and display is performed when rice cooking is not normally completed. The display unit 2 is provided, and the heating unit 3 is driven and controlled by the control unit 5 to perform the rice cooking operation with a predetermined heating power.

  FIG. 2 shows a cross-sectional view of the rice cooker, in which the pot 1 is stored inside the rice cooker body. A bottom heater 103 is provided as a heating device 3 for heating the bottom of the pot 1, and a bottom temperature sensor 104 is provided as a pot temperature detection unit 4 for detecting the temperature of the pot 1 at the bottom of the pot 1. The bottom temperature sensor 104 is arranged in contact with the bottom surface of the pan 1 so as to freely move up and down. A lid temperature sensor 105 that detects the temperature of the lid 102 that covers the pan 1 so as to be freely opened and closed is arranged inside the lid 102.

  Both the bottom temperature sensor 104 and the lid temperature sensor 105 are temperature resistance elements that convert the amount of change in temperature into a resistance value. The lid temperature sensor 105 indirectly detects a temperature change of water (water vapor) in the pan 1.

  On the surface of the lid 102, an input device 106a such as a rice cooking menu selection key or an on / off key, and a liquid crystal display element 101 for displaying the rice cooking state are provided. The liquid crystal display element 101 is also used as the display unit 2 that performs display when rice cooking is not normally completed.

  The control device 106 inside the lid 102 and the control device 107 attached to the side surface inside the main body are a bottom heater according to the temperature detected by the bottom temperature sensor 104 and the lid temperature sensor 105 and an instruction inputted from the input device 106a. It is configured to be incorporated in a circuit board such as a microcomputer that controls the driving device for driving 103 to heat the pot 1 and perform the rice cooking operation.

  The control devices 106 and 107 perform ON-OFF heating control of the heating device 3 (bottom heater 103) in order to maintain the predetermined first water absorption temperature in the water absorption process performed immediately after the start of rice cooking, and the pot temperature detection unit 4 (bottom temperature sensor 104), when the variation width of the temperature detected is smaller than the predetermined temperature width, it is determined that there is a foreign object between the pan temperature detector 4 (bottom temperature sensor 104) and the pan 1, After the completion of cooking, a message to that effect is displayed on the display unit 2 (liquid crystal display element 101).

  About the rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below, referring FIG.

  FIG. 3 is a diagram illustrating a sequence of the rice cooker according to the first embodiment of this invention.

In the water absorption process performed immediately after the start of rice cooking, the temperature in the pan 1 is controlled to be heated so as to be maintained at about 45 ° C. for 15 minutes, so that the rice is gelatinized so that water is absorbed and no core remains in the rice. it can.

  Therefore, first, in the water absorption process, the control devices 106 and 107 continuously heat the bottom heater 103 (heater ON) so that the bottom temperature sensor 104 in the pan 1 is maintained at a predetermined first water absorption temperature of about 45 ° C. )

  When the bottom temperature sensor 104 reaches 45 ° C., the control devices 106 and 107 turn off the bottom heater 103 (heater OFF). At this time, even if the power to the bottom heater 103 is turned off, the bottom temperature sensor 104 overshoots for a while and the temperature rises.

  When this increased temperature falls again due to the heater OFF and then drops to 45 ° C. after the overshoot, the control devices 106 and 107 resume energization of the bottom heater 103. By this heater ON operation, the temperature of the bottom temperature sensor 104 starts to rise.

  Thus, when the temperature detected by the bottom temperature sensor 104 is controlled to about 45 ° C. in order to maintain the temperature in the pan 1 at about 45 ° C., a time lag occurs in the ON / OFF heating control of the bottom heater 103. Then, it fluctuates with a certain temperature range across a predetermined first water absorption temperature (about 45 ° C.).

  When the difference (temperature variation width) between the upper limit value and the lower limit value of the bottom temperature sensor 104 is normal, a width of about 10 ° C. (10 ° C. or more when the room temperature is low) can be confirmed. This occurs because even if the bottom heater 103 is heated, the bottom temperature of the pan 1 only rises, and when the heating from the bottom heater 103 is stopped, the temperature is lowered to a low temperature in the pan 1.

  When this temperature variation width is smaller than a normal value (for example, about 4 ° C. or less), it can be determined that the low temperature in the pan 1 is not sufficiently transmitted and cannot be lowered. That is, since it can be determined that a foreign substance is present between the bottom temperature sensor 104 and the pan 1, after the heating is stopped, “sensor abnormality” is displayed on the liquid crystal display element 101.

  As mentioned above, in this Embodiment, it can detect in the water absorption process immediately after rice cooking that the foreign material exists between the pan temperature detection part 4 (bottom temperature sensor 104) and the pan 1, and a pan Even if the temperature detection does not work well due to the foreign matter adhering to the temperature detection unit 4 (bottom temperature sensor 104), the foreign matter can be detected before the water in the pan 1 boils, and it is possible to prevent scorching and abnormal heat generation. .

(Embodiment 2)
Since the block diagram of the rice cooker in this Embodiment and sectional drawing of a rice cooker are the same as that of Embodiment 1, the overlapping description is abbreviate | omitted and only a difference is demonstrated.

  The control devices 106 and 107 perform ON-OFF heating control of the heating device 3 (bottom heater 103) in order to maintain the predetermined first water absorption temperature in the water absorption process performed immediately after the start of rice cooking, and the pot temperature detection unit 4 (bottom temperature sensor 104), when the variation width of the temperature detected is smaller than the predetermined temperature width, foreign matter is interposed between the pan temperature detection unit 4 (bottom temperature sensor 104) and the pan 1, and the temperature input is accurately performed. It is determined that the heat absorption is not performed, and the set water absorption temperature is changed from the predetermined first water absorption temperature to the predetermined second water absorption temperature.

  About the rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below, referring FIG.

  Drawing 4 is a figure showing the sequence of the rice cooker of a 2nd embodiment of the present invention.

  In the water absorption process performed immediately after the start of rice cooking, the temperature in the pan 1 is controlled to be heated so as to be maintained at about 45 ° C. for 15 minutes, so that the rice is gelatinized so that water is absorbed and no core remains in the rice. it can.

  Therefore, first, in the water absorption process, the control devices 106 and 107 continuously heat the bottom heater 103 (heater ON) so that the bottom temperature sensor 104 in the pan 1 is maintained at a predetermined first water absorption temperature of about 45 ° C. )

  When the bottom temperature sensor 104 reaches 45 ° C., the control devices 106 and 107 turn off the bottom heater 103 (heater OFF). At this time, even if the power to the bottom heater 103 is turned off, the bottom temperature sensor 104 overshoots for a while and the temperature rises.

  When this increased temperature falls again due to the heater OFF and then drops to 45 ° C. after the overshoot, the control devices 106 and 107 resume energization of the bottom heater 103. By this heater ON operation, the temperature of the bottom temperature sensor 104 starts to rise.

  Thus, when the temperature detected by the bottom temperature sensor 104 is controlled to about 45 ° C. in order to maintain the temperature in the pan 1 at about 45 ° C., a time lag occurs in the ON / OFF heating control of the bottom heater 103. Then, it fluctuates with a certain temperature range across a predetermined first water absorption temperature (about 45 ° C.).

  When the difference (temperature variation width) between the upper limit value and the lower limit value of the bottom temperature sensor 104 is normal, a width of about 10 ° C. (10 ° C. or more when the room temperature is low) can be confirmed. This occurs because even if the bottom heater 103 is heated, the bottom temperature of the pan 1 only rises, and when the heating from the bottom heater 103 is stopped, the temperature is lowered to a low temperature in the pan 1.

  When this temperature variation width is smaller than a normal value (for example, about 6 ° C. or less), it can be determined that the low temperature in the pan 1 is not sufficiently transmitted and cannot be lowered. That is, since it can be determined that foreign matter is present between the bottom temperature sensor 104 and the pan 1, the bottom temperature sensor 104 in the water absorption process is maintained at a predetermined second water absorption temperature (for example, about 38 ° C.). Control the heating by changing the set water absorption temperature.

  Since the foreign matter intervening in the bottom temperature sensor 104 is heated larger than the normal sensing heating amount without foreign matter, the total heating amount of the water absorption step can be reduced by resetting the control temperature of the water absorption step low. It has been corrected. It progresses to the cooking process after completion of the water absorption process.

  As mentioned above, in this Embodiment, even when a foreign material enters between the pan temperature detection part 4 and the pan 1, and detection temperature cannot be detected correctly, the presence of a foreign material is detected in the water absorption process immediately after cooking rice. And since the water absorption process can be carried out at a temperature that has corrected the pot detection temperature from the middle of the water absorption process, which is the first process of rice cooking, the optimal heating power required to cook deliciously while preventing scorching and abnormal heat generation You can cook it with rice.

  The threshold value of the temperature variation width in the present embodiment is about 6 ° C., which is different from the threshold value in the first embodiment (about 4 ° C.), but may be the same value.

(Embodiment 3)
Since the block diagram of the rice cooker in this Embodiment and sectional drawing of a rice cooker are the same as that of Embodiment 1, the overlapping description is abbreviate | omitted and only a difference is demonstrated.

  The control devices 106 and 107 perform ON-OFF heating control of the heating device 3 (bottom heater 103) in order to maintain the predetermined first water absorption temperature in the water absorption process performed immediately after the start of rice cooking, and the pot temperature detection unit 4 (bottom temperature sensor 104), when the variation width of the temperature detected is smaller than the predetermined temperature width, foreign matter is interposed between the pan temperature detection unit 4 (bottom temperature sensor 104) and the pan 1, and the temperature input is accurately performed. It is determined that the set water absorption temperature is changed from the predetermined first water absorption temperature to the predetermined second water absorption temperature, and the predetermined second temperature is controlled in accordance with the temperature variation width. Yes.

  About the rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below, referring FIG.

  FIG. 5 is a diagram showing a sequence of the rice cooker according to the third embodiment of the present invention.

  In the water absorption process performed immediately after the start of rice cooking, the temperature in the pan 1 is controlled to be heated so as to be maintained at about 45 ° C. for 15 minutes, so that the rice is gelatinized so that water is absorbed and no core remains in the rice. it can.

  Therefore, first, in the water absorption process, the control devices 106 and 107 continuously heat the bottom heater 103 (heater ON) so that the bottom temperature sensor 104 in the pan 1 is maintained at a predetermined first water absorption temperature of about 45 ° C. )

  When the bottom temperature sensor 104 reaches 45 ° C., the control devices 106 and 107 turn off the bottom heater 103 (heater OFF). At this time, even if the power to the bottom heater 103 is turned off, the bottom temperature sensor 104 overshoots for a while and the temperature rises.

  When this increased temperature falls again due to the heater OFF and then drops to 45 ° C. after the overshoot, the control devices 106 and 107 resume energization of the bottom heater 103. By this heater ON operation, the temperature of the bottom temperature sensor 104 starts to rise.

  Thus, when the temperature detected by the bottom temperature sensor 104 is controlled to about 45 ° C. in order to maintain the temperature in the pan 1 at about 45 ° C., a time lag occurs in the ON / OFF heating control of the bottom heater 103. Then, it fluctuates with a certain temperature range across a predetermined first water absorption temperature (about 45 ° C.).

  When the difference (temperature variation width) between the upper limit value and the lower limit value of the bottom temperature sensor 104 is normal, a width of about 10 ° C. (10 ° C. or more when the room temperature is low) can be confirmed. This occurs because even if the bottom heater 103 is heated, the bottom temperature of the pan 1 only rises, and when the heating from the bottom heater 103 is stopped, the temperature is lowered to a low temperature in the pan 1.

  When this temperature variation width is smaller than a normal value (for example, about 8 ° C. or less), it can be determined that the low temperature in the pan 1 is not sufficiently transmitted and cannot be lowered. That is, since it can be determined that a foreign matter is present between the bottom temperature sensor 104 and the pan 1, the set water absorption temperature is changed so that the bottom temperature sensor 104 in the water absorption process is maintained at the predetermined second water absorption temperature. Control heating.

  At that time, the predetermined second water absorption temperature is varied in accordance with the temperature variation width. For example, when the temperature variation range is 6 ° C. or more and 8 ° C. or less, the predetermined second water absorption temperature is set to about 42 ° C., and the set water absorption temperature is set so that the bottom temperature sensor 104 in the water absorption process is maintained at about 42 ° C. Change the heating control.

  When the temperature variation width is 4 ° C. or more and less than 6 ° C., the predetermined second water absorption temperature is set to about 38 ° C., and the set water absorption temperature is set so that the bottom temperature sensor 104 in the water absorption process is maintained at about 38 ° C. Change the heating control.

  Furthermore, when the temperature variation width is less than 4 ° C., the heating is stopped because there is a foreign substance having a size that cannot be corrected, and “sensor abnormality” is displayed on the liquid crystal display element 101.

  As mentioned above, in this Embodiment, even when a foreign material enters between the pan temperature detection part 4 (bottom temperature sensor 104) and the pan 1, and detection temperature cannot be detected correctly, the water absorption process immediately after cooking rice In the middle of the water absorption process, which is the first process of cooking rice, and more precisely correcting the deviation width of the temperature detected by the pot temperature detection unit 4 (bottom temperature sensor 104) due to the foreign substance, more accurately. Since the water absorption process can be carried out at the absorbed water temperature, it is possible to cook rice with the optimum heating power necessary to cook deliciously while preventing scorching and abnormal heat generation.

(Embodiment 4)
Since the block diagram of the rice cooker in this Embodiment and sectional drawing of a rice cooker are the same as that of Embodiment 1, the overlapping description is abbreviate | omitted and only a difference is demonstrated.

  The control devices 106 and 107 perform ON-OFF heating control of the heating device 3 (bottom heater 103) in order to maintain the predetermined first water absorption temperature in the water absorption process performed immediately after the start of rice cooking, and the pot temperature detection unit 4 (bottom temperature sensor 104), when the variation width of the temperature detected is smaller than the predetermined temperature width, foreign matter is interposed between the pan temperature detection unit 4 (bottom temperature sensor 104) and the pan 1, and the temperature input is accurately performed. It is determined that it has not been performed, the set water absorption temperature is changed from the predetermined first water absorption temperature to the predetermined second water absorption temperature, and the predetermined second temperature is varied according to the temperature variation width, and heating control is performed. The cooking operation is performed at a temperature lower than the normal cooking temperature.

  About the rice cooker comprised as mentioned above, the operation | movement and an effect | action are demonstrated below, referring FIG.

  FIG. 6 is a diagram showing a sequence of the rice cooker according to the fourth embodiment of the present invention.

  In the water absorption process performed immediately after the start of rice cooking, the temperature in the pan 1 is controlled to be heated so as to be maintained at about 45 ° C. for 15 minutes, so that the rice is gelatinized so that water is absorbed and no core remains in the rice. it can.

  Therefore, first, in the water absorption process, the control devices 106 and 107 continuously heat the bottom heater 103 (heater ON) so that the bottom temperature sensor 104 in the pan 1 is maintained at a predetermined first water absorption temperature of about 45 ° C. )

  When the bottom temperature sensor 104 reaches 45 ° C., the control devices 106 and 107 turn off the bottom heater 103 (heater OFF). At this time, even if the power to the bottom heater 103 is turned off, the bottom temperature sensor 104 overshoots for a while and the temperature rises.

  When this increased temperature falls again due to the heater OFF and then drops to 45 ° C. after the overshoot, the control devices 106 and 107 resume energization of the bottom heater 103. By this heater ON operation, the temperature of the bottom temperature sensor 104 starts to rise.

Thus, when the temperature detected by the bottom temperature sensor 104 is controlled to about 45 ° C. in order to maintain the temperature in the pan 1 at about 45 ° C., a time lag occurs in the ON / OFF heating control of the bottom heater 103. Then, it fluctuates with a certain temperature range across a predetermined first water absorption temperature (about 45 ° C.).

  When the difference (temperature variation width) between the upper limit value and the lower limit value of the bottom temperature sensor 104 is normal, a width of about 10 ° C. (10 ° C. or more when the room temperature is low) can be confirmed. This occurs because even if the bottom heater 103 is heated, the bottom temperature of the pan 1 only rises, and when the heating from the bottom heater 103 is stopped, the temperature is lowered to a low temperature in the pan 1.

  When this temperature variation width is smaller than a normal value (for example, about 8 ° C. or less), it can be determined that the low temperature in the pan 1 is not sufficiently transmitted and cannot be lowered. That is, since it can be determined that a foreign matter is present between the bottom temperature sensor 104 and the pan 1, the set water absorption temperature is changed so that the bottom temperature sensor 104 in the water absorption process is maintained at the predetermined second water absorption temperature. Control heating.

  At that time, the predetermined second water absorption temperature is varied in accordance with the temperature variation width. For example, when the temperature variation range is 6 ° C. or more and 8 ° C. or less, the predetermined second water absorption temperature is set to about 42 ° C., and the set water absorption temperature is set so that the bottom temperature sensor 104 in the water absorption process is maintained at about 42 ° C. Change the heating control.

  When the temperature variation width is 4 ° C. or more and less than 6 ° C., the predetermined second water absorption temperature is set to about 38 ° C., and the set water absorption temperature is set so that the bottom temperature sensor 104 in the water absorption process is maintained at about 38 ° C. Change the heating control.

  Furthermore, when the temperature variation width is less than 4 ° C., the heating is stopped because there is a foreign substance having a size that cannot be corrected, and “sensor abnormality” is displayed on the liquid crystal display element 101.

  When the water absorption process is completed, the process proceeds to the cooking process, and the cooking operation is performed at about 115 ° C., which is 15 ° C. lower than the normal temperature (about 130 ° C.) at which the bottom temperature sensor 104 has no foreign matter attached.

  When the bottom temperature sensor 104 reaches the cooking temperature, the process proceeds to the steaming step, and after cooking for 15 minutes, the cooking is finished.

  As mentioned above, in this Embodiment, even when a foreign material enters between the pan temperature detection part 4 (bottom temperature sensor 104) and the pan 1, and detection temperature cannot be detected correctly, the water absorption process immediately after cooking rice The detection of the temperature of the pot temperature detection unit 4 (bottom temperature sensor 104) from the middle of the water absorption process, which is the first process of cooking rice, and the detection of the pot temperature detection unit 4 (bottom temperature sensor 104) by a foreign object By finely correcting the temperature deviation width, the water absorption process can be carried out at a more accurate water absorption temperature, and by making the cooking temperature lower than normal, the cooking temperature deviation is also corrected. It is possible to cook rice with the optimum heating power and cooking temperature necessary to cook deliciously while preventing burning.

  As described above, in the rice cooker according to the present invention, even when a foreign object enters between the pan temperature detection unit and the pan and the detection temperature cannot be accurately detected, it can be burnt or abnormally heated by detecting it before boiling. Since it can be reduced, it can be applied to uses such as a heating cooker.

DESCRIPTION OF SYMBOLS 1 Pan 2 Display part 3 Heating device 4 Pan temperature detection part 5 Control part 101 Liquid crystal display element 102 Cover 103 Bottom heater 104 Bottom temperature sensor 105 Cover temperature sensor 106 Control apparatus 106a Input apparatus 107 Control apparatus

Claims (4)

A pan housed inside the rice cooker body, a heating device that heats the bottom of the pan, a pan temperature detection unit that detects the temperature of the pan, and a display that displays when cooking is not completed normally And a control unit that controls the heating device from the temperature detected by the pan temperature detection unit to perform a rice cooking operation, and the control unit is a predetermined first water absorption in a water absorption process performed immediately after the start of rice cooking At the time of heating control to maintain the temperature, when the variation width of the temperature detected by the pan temperature detection unit is equal to or less than the first temperature range smaller than the predetermined temperature range at the normal time , there was an abnormality in the display unit after the heating was stopped A rice cooker that displays the effect . The control unit has a predetermined temperature range when the normal temperature is larger than the first temperature range in the variation range of the detected temperature of the pan temperature detection unit during the heating control for maintaining the predetermined first water absorption temperature in the water absorption process. 2. The rice cooker according to claim 1 , wherein when the temperature is equal to or smaller than a second temperature width smaller than the width, heating control is performed to maintain a predetermined second water absorption temperature lower than the first water absorption temperature . The control unit has a predetermined temperature range when the normal temperature is larger than the first temperature range in the variation range of the detected temperature of the pan temperature detection unit during the heating control for maintaining the predetermined first water absorption temperature in the water absorption process. The rice cooker according to claim 2, wherein the predetermined second water absorption temperature is varied according to the temperature variation width when the temperature is equal to or smaller than the second temperature width smaller than the width . The control unit has a predetermined temperature range when the normal temperature is larger than the first temperature range in the variation range of the detected temperature of the pan temperature detection unit during the heating control for maintaining the predetermined first water absorption temperature in the water absorption process. When the temperature is equal to or smaller than the second temperature width smaller than the width , the predetermined second water absorption temperature is varied according to the temperature variation width, and the cooking operation is performed at a temperature lower than the normal cooking temperature. 3. The rice cooker according to 3.

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