JPH0819477A - Cooking utensil - Google Patents

Abstract

PURPOSE:To shorten inspecting time by detecting the disconnection of a pan sensor correctly when cooking and inspection are performed. CONSTITUTION:Induction coils 6, 7 are energized intermittently when the cooking is performed based on the heating pattern of a cooking control means 61. Also, the induction coils 6, 7 are energized continuously with the maximum output when the inspection is performed by an inspection control means 62. A fault detecting means 63 detects the disconnection of the pan sensor 9 after the lapse of prescribed time after the cooking is started. When the inspection is performed, the disconnection can be detected immediately after the inspection is started. By performing such operation, erroneous detection can be prevented from being performed even when the disconnection is detected immediately after the inspection is started since working environment is managed in the inspection. Also, the inspecting time can be shortened by detecting the disconnection immediately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooker with improved detection of a failure due to a disconnection or the like in a temperature detecting means.

[0002]

2. Description of the Related Art Conventionally, in a cooker such as a rice cooker of this type, the function of detecting a disconnection failure of a negative characteristic thermistor as a temperature detecting means for detecting the temperature of a pan has been disclosed in Japanese Patent Publication No. 5620.
It is disclosed in Japanese Patent No. 3, etc. This is because if the thermistor is below a predetermined temperature (for example, −20 ° C.) after a predetermined time elapses after the power is turned on to energize the pot heating means which is a heating element and the output of the thermistor is changed. When it is determined that the thermistor is out of order due to a disconnection or the like, the power to the pot heating means is stopped. Generally, the resistance value of the thermistor at the time of disconnection is infinite as it is at the time of low temperature detection, so if disconnection detection is performed without heating the pot heating means, the disconnection will occur when the outside air temperature is extremely low. There is a possibility that it may be erroneously detected as being in the state, but if the disconnection is detected after the pot heating means is energized for a predetermined time (for example, 1 minute) in this way, the detected temperature of the thermistor is surely -20 during normal operation. The temperature detected by the thermistor remains below -20 ° C when there is a wire breakage when the temperature should have been above ℃. Therefore, when the outside air temperature is low or the timer is activated at night, the temperature is low in the morning. Even when the cooking is started, the disconnection can be surely detected without error.

On the other hand, when inspecting a cooker during assembly,
In addition to the control means for cooking which energizes the pot heating means intermittently according to a predetermined heating pattern, a control means for inspection which energizes the pot heating means continuously at the maximum output is activated to check the heating output and heating of the pot heating means. The output is adjusted in a short time and reliably.

[0004]

As described above, the configuration in which the disconnection failure detection of the thermistor is performed after the elapse of a predetermined time after the start of heating has no possibility of causing an erroneous detection even under a low outside air temperature condition. , Has the advantage of high reliability.
However, if such disconnection failure detection is directly applied to the control means at the time of inspection, if the heating output confirmation and heating output adjustment for the pan heating means are completed before the elapse of a predetermined time after the start of heating, then There is a drawback that the entire inspection time becomes long because it is necessary to wait in that state until the thermistor disconnection is detected until a predetermined time elapses. Further, in this inspection, if a disconnection of the thermistor is detected, it is necessary to replace the thermistor with another one and then perform the same inspection again, which requires twice the inspection time. Moreover, when the thermistor is disconnected, if the pan is inspected in an empty state, the pan will rapidly reach a high temperature even if the maximum power is continuously supplied until the specified time elapses. Since the thermistor cannot detect that the pot is in the state, there is a risk that the pot container may be deformed or melted due to abnormal heating.

In view of the above circumstances, therefore, the present invention prevents erroneous detection during cooking to improve reliability, shortens inspection time during inspection, and prevents abnormal heating, and in any case, the temperature detecting means malfunctions. It is an object of the present invention to provide a cooker capable of surely performing detection.

[0006]

The cooking device of the present invention is based on a pot, a pot heating means for heating the pot, a temperature detecting means for detecting the temperature of the pot, and a temperature detected by the temperature detecting means. The pan heating means is energized to control cooking while controlling the energization amount and energization interval according to a predetermined heating pattern, cooking control means for energizing the pan heating means continuously or intermittently, and the temperature detecting means are provided. And a failure detection means for determining the failure of the temperature detection means when the temperature is lower than a predetermined temperature and stopping the heating of the pot heating means, wherein the failure detection means is predetermined after the start of cooking during cooking by the cooking control means. The failure of the temperature detecting means is detected after a lapse of time, and the failure of the temperature detecting means is detected immediately after the start of the inspection during the inspection by the inspection control means.

[0007]

[Function] During cooking, a predetermined time has elapsed since the cooking was started, and after the pot is heated by the pot heating means, the failure of the temperature detecting means is detected. Therefore, even if the outside air temperature is low, it is erroneously detected. There is no risk of erroneous detection that the temperature detecting means is broken. On the other hand, at the time of inspection, since the inspection can be performed under the condition that the working environment is controlled to some extent, even if the failure detection of the temperature detection means is performed immediately after heating the pot, there is no risk of erroneous detection.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 1 showing an overall cross-sectional view of a rice cooker serving as a cooker, 1 is a bowl body having an upper surface 3 opened, which surrounds an inner frame 2 serving as a pot housing portion and the outside of the inner frame 2. Outer plastic frame 3 provided
Composed of and. 4 is a pot as a container for containing cooked food mainly made of aluminum material.
When the inner frame 2 is housed, is supported above the inner frame 2 in a suspended state. A heating layer 5 made of a magnetic metal material for heating the pot 4 is provided at the bottom and the lower portion of the side surface of the pot 4.

[0009] Reference numerals 6 and 7 are induction coils for induction heating of the heat generating layer 5 provided at the bottom of the outer surface and the lower portion of the side surface of the inner frame 2 as a pan heating means for heating the pan 4. The heat generating layer 7 is disposed at a predetermined distance from the heat generating layer 5. Reference numeral 8 denotes a coil cover that is attached and fixed so as to cover the outside of the induction coils 6 and 7, and prevents leakage magnetic flux from the induction coils 6 and 7. Reference numeral 9 denotes a pan sensor as a temperature detecting means, which is provided in contact with the bottom surface of the pan 4. The pan sensor 9 is provided with a negative characteristic thermistor (not shown) for detecting the outer surface temperature of the pan 4, and is provided so as to be retractable into an opening 10 formed in the central bottom portion of the inner frame 4. Reference numeral 11 is a control board provided in the lower part of the main body 1, and for example, an inverter circuit for supplying a predetermined high frequency current to the induction coils 6 and 7 is built therein.
An intake port 12 and an exhaust port 13 are provided at the bottom and side parts of the outer frame 3, respectively, and a cooling fan 14 and a motor 15 that constitute a blower are provided inside the device body 1 so as to face the intake port 12. By introducing the cool air into the main body 1 by rotating the cooling fan 14, the induction coils 6, 7 and the control board 11
I am trying to cool such things.

Reference numeral 21 is a lid that covers the upper opening of the pot 4 so as to be openable and closable. The lid body 21 is attached, for example, with an outer lid 22 made of polypropylene resin, an outer lid cover 23 provided along the lower outer periphery of the outer lid 22, and a space below the outer lid 22 to form a space. Heat sink made of aluminum material
24, and an inner lid 26 that closes the upper opening of the pan 4 via an inner lid retainer 25 is detachably attached to the lower portion of the heat dissipation plate 24. 27 is an outer lid cover 23 and a heat sink 24
It is an annular lid packing sandwiched between the
When closed, the lower end of the lid packing 27 comes into close contact with the upper flange portion of the pan 4. A lid heater 28 such as a cord heater is provided on the upper surface of the radiator plate 24 forming the lower surface of the lid as a lid heating means for heating the radiator plate 24 during rice cooking and heat retention, and the temperature of the radiator plate 24 is controlled. As a lid temperature detecting means for detecting, a lid sensor 29 including a negative characteristic thermistor is provided. The lid heater 28 constitutes a parallel circuit with a body heater 30 mainly composed of a code heater provided on the upper outer surface of the inner frame 2 for keeping the inner frame 2 warm. Incidentally, 31 is a steam port for discharging the steam generated from the pan 4 to the outside.

Next, the circuit configuration of the rice cooker will be described with reference to FIG. 2. Reference numeral 41 is a microcomputer mounted on the control board 11, which is, as is well known, a control device 42 constituting a microprocessor and an arithmetic operation. In addition to the device 43, a timer device 44 and a storage device including a ROM and a RAM.
It has 45. An input device 46 composed of an A / D converter is connected to the input side of the microcomputer 41, and the pan sensor 9 and the lid sensor described above are connected via this input device 46.
Along with 29, an operation switch 47, which is an operation means for starting rice cooking and heat retention, and a pan detection sensor 48 for detecting the presence or absence of the pan 4 are connected. On the other hand, the output device 49 is connected to the output side of the microcomputer 41.
A heater driving means 51 having an induction heating means 50 for electromagnetically heating the pot 4 and a switch means such as a triac for controlling the on / off of the body heater 30 and the lid heater 28 at the same time.
And motor drive means 52 for driving the cooling motor 15 are connected. In addition to these, the output device 49 includes a display drive means 54 for controlling display on an LCD / LED display means 53 including an LCD which is a liquid crystal display for displaying time and the like, and an LED for displaying an operating state and the like. In addition to being connected, the buzzer driving means 56 for controlling the ringing of the buzzer 55 for notifying the end of the timer rice cooking is also connected. The microcomputer 41 operates the operation signal of the operation switch 47, the temperature data from the pan sensor 9 and the lid sensor 29, the pan detection signal by the lower limit detection of the input current of the inverter circuit built in the control board 11, and the timer device 44. Depending on time information from
Induction heating means 50, lid heater 28, and body heater 30, L according to a control sequence preset in storage device 45.
It controls the CD / LED display means 53 and the buzzer 55. In addition,
Reference numeral 57 is a power failure backup means that is connected to the output device 49 and backs up the content stored in the storage means 45 of the microcomputer 41 at the time of power failure via the microcomputer drive means 58. In this embodiment, the maximum output of the induction coils 6 and 7 is 1200 W, and the maximum output of the lid heater 28 and the body heater 30 is about 50 W.

A high frequency current is supplied to the induction heating means 50 on the basis of an output signal from the microcomputer 41, and a high frequency current for varying the high frequency current value and controlling the interruption / disconnection of the induction coils 6, 7. A current adjusting means 59 is provided. Then, when a predetermined high frequency current is supplied to the induction coils 6, 7 from the high frequency current adjusting means 59, an alternating magnetic field is generated in the induction coils 6, 7 and the induction coils 6, 7.
An eddy current is generated in each of the heat generating layers 5 facing 7 and the eddy currents are converted into Joule heat, so that the heat generating layers 5 generate heat and the pan 4 is heated.

Next, the storage device of the microcomputer 41
The configuration of the processing procedure of the control sequence stored in 45 will be described based on the block diagram of FIG. In the figure, reference numeral 61 is a cooking control means for performing cooking by intermittently energizing the induction coils 6, 7, the body heater 30, and the lid heater 28 in a predetermined heating pattern based on the temperatures detected by the pan sensor 9 and the lid sensor 29. In the rice cooker according to the present embodiment, the cooking control means 61 from the hot water cooking to the muramura heating and the heat retention control means for keeping the inside of the pan 4 at a predetermined temperature after the murachi heating are provided in the cooking control means 61. Applicable Further, 62 is an inspection control means for continuously energizing the induction coils 6 and 7 at the maximum output from the start,
The inspection control means 62 is mainly executed during the assembly inspection.

Reference numeral 63 is a failure detecting means for detecting whether or not the pan sensor 9 or the lid sensor 29 is broken due to a disconnection or the like according to a command from the cooking control means 61 or the inspection control means. 9 or lid sensor
When the detected temperature of 29 is lower than a predetermined temperature, it is determined that the pan sensor 9 and the lid sensor 29 have failed, and the heating of the induction coils 6, 7, the body heater 30 and the lid heater 28 is stopped. To do. In the present embodiment, the failure detecting means 63 includes a pan sensor failure detecting means 64 for detecting a failure of the pan sensor 9 and a lid sensor failure detecting means 65 for detecting a failure of the lid sensor 29. While the detection means 63 detects the failure of the pan sensor 9 and the lid sensor 29 after a predetermined time has elapsed after the start of cooking when cooking by the cooking control means 61, it starts the inspection during the inspection by the inspection control means 62. It should be noted that the configuration is such that the pot sensor 9 and the lid sensor 29 are detected immediately after the failure.

With respect to the rice cooker having the above-mentioned structure, its operation is shown in the graphs of FIGS. 4 and 5 showing the disconnection between the induction coils 6, 7 and the body heater 30 and the lid heater 28, and FIGS. 6 to 8. A description will be given based on the flowchart. First, the procedure at the time of inspection when the inspection control means 62 is selected will be described based on FIGS. 4 and 6. When the inspection control is started in step S1, the high frequency current adjusting means 59 of the induction heating means 50 causes the induction heating means 50 to perform induction. The output to the coils 6 and 7 is set to the maximum value and continuously energized (step S2). Then, step S
When shifting to 3, the failure detection means 63 immediately detects the failure of the pan sensor 9 based on the command from the inspection control means 62. That is, the pan sensor failure detection means 64 is the pan sensor 9
If the temperature detected by the pan sensor 9 is below -20 ° C, and the temperature detected by the pan sensor 9 is less than -20 ° C and continues for 1 second or longer, the pan sensor failure detection means 64 causes the pan sensor 9 to fail due to a disconnection or the like. Is determined to have occurred, and the operation of the induction coils 6 and 7 is forcibly stopped in preference to the control of the inspection control means 62 (step S4). Further, the pan / sensor failure detection means 64 causes the LCD / LED display means 53, which is the display means.
The pan sensor 9 is displayed to indicate that a malfunction has occurred (step S5), and the operation switch 47 is locked in order to prevent the user from operating the pan sensor 9 again.
On the other hand, in step S3, if the temperature detected by the pan sensor 9 is -20 ° C or higher, it is determined that the pan sensor 9 is normal, and the procedure of the next step S6 is executed.

In step S6, the failure detection means 63 detects the failure of the lid sensor 29 based on the command from the inspection control means 62. That is, the lid sensor failure detection means 65
Determines whether the temperature detected by the lid sensor 29 is lower than −20 ° C., and if the temperature detected by the lid sensor 29 is lower than −20 ° C. and continues for 1 second or longer, the lid sensor failure detection means 65 causes the lid sensor 29 to detect.
Is determined to have caused a failure due to disconnection or the like, and the operation of the induction coils 6 and 7 is forcibly stopped in preference to the control of the inspection control means 62 (step S6). Also, the lid sensor failure detection means 65 allows the LCD / LED display means 53
A message indicating that the lid sensor 29 has failed is displayed via (step S7), and the operation switch 47 is locked. In this case, it is preferable that the failure display of the LCD / LED display means 53 be different from the display form when the pan sensor 9 fails, since the failure location can be immediately determined. If the temperature detected by the lid sensor 29 is -20 ° C or higher in step S6, it is determined that the lid sensor 29 is normal, and the process returns to step S2. After that, various tests such as heating output confirmation and heating output adjustment are performed with the induction coils 6 and 7 continuously energized to the maximum output, but when the temperature detected by the pan sensor 9 reaches a predetermined cooking temperature,
The energization of the induction coils 6 and 7 is stopped.

Next, the procedure when the cooking control means 61 is selected will be described with reference to the graph of FIG. 5 and the flowcharts of FIGS. In the flowchart of FIG. 6 showing the procedure for detecting the failure of the pan sensor 9, when the operation switch 47 is pressed to start the rice cooking control (step S11), the cooking control means 61 causes the induction coil 6 serving as the pan heating means. , 7 are intermittently energized and cooking control is performed in a predetermined heating pattern (step S12). First, step S
In 13, the hot water cooking process based on the cooking control means 61 is performed. In this hot water cooking process, the induction coils 6 and 7 are energized at a low output of about 500 W for 1 second to determine whether or not the pan 4 is present. If it is determined that the inner frame 2 is not accommodated, the state immediately shifts to the off state. On the other hand, pan 4
When it is determined that the pan is housed in the inner frame 2, the temperature detected by the pan sensor 9 is stabilized for 30 seconds in step S14 while the induction coils 6 and 7 are turned off for 29 seconds. After the pot detection period ends, the induction coils 6 and 7 are set to 80
While the power of 0 W is turned on for 50 seconds and the power is turned off for 10 seconds, hot water heating, which is a heating period of the pan sensor 9, is started. At this time, the body heater 30 and the lid heater 28 remain in the power-off state. In step S15, 60 seconds after the start of the hot water cooking, the cooking control means 61 determines that the pot sensor 9 has risen in temperature to some extent, and the next step S1.
Go to 6. In this step S16, the cooking control means
When the failure detecting means 63 detects the failure of the pan sensor 9 based on the command from 61, and the detected temperature of the pan sensor 9 is less than −20 ° C. and continues for 1 second or more, as in step S3,
The pan sensor failure detection means 64 determines the failure of the pan sensor 9 and gives priority over the control of the cooking control means 61 to forcibly stop the operation of the induction coils 6 and 7 (step S1).
7). In step S18, the LCD / LED
A failure display of the pan sensor 9 is displayed via the display means 53, and the operation switch 47 is locked. On the other hand, step S
16, when the temperature detected by the pan sensor 9 is -20 ° C or higher, it is determined that the pan sensor 9 is normal, and the control based on the heating pattern of the cooking / heating means 61 is preferentially executed.

Continuing with the flowchart of FIG.
Explaining the procedure until the failure detection of the lid sensor 29,
In step S21, when the cooking control means 61 starts the cooking control, the hot water cooking process as shown in the flowchart of FIG. 6 is performed (step S22). However, when this hot water cooking process has passed for 15 minutes (step S23),
After shifting to step S24, the cooking control means 61 continues the heating control process. In the heating control process, the induction coils 6 and 7 are continuously energized with an output of 1200 W to heat the cooked food in the pan 4, but in the next step S25,
The rate of increase in the temperature detected by the lid sensor 29 becomes 2 ° C or less in 60 seconds, or the temperature detected by the pan sensor 9 is 105 ° C.
When it becomes a state that continues for 180 seconds, it is determined that the boiling detection in the pan 4 is completed, and the process proceeds to the stable control process in step S26. In this stable control process, the induction coils 6 and 7 are repeatedly energized for 10 seconds and disconnected for 5 seconds at an output of 1000 W, and the body heater 30 and the lid heater 28 are energized for 30 seconds in order to prevent dew condensation on the heat sink 24. The operation of disconnecting electricity for / 30 seconds is repeated to heat the heat dissipation plate 24 forming the lower surface of the lid body 21 (step S27). Then, in step S28, when the temperature detected by the pan sensor 9 reaches 120 ° C., it is determined that the inside of the pan 4 has been cooked, and the process shifts to the next purging stroke (step S29).

In the purging process, the induction coils 6 and 7 are heated and controlled so that the temperature detected by the pan sensor 9 becomes 101 ° C., and the lid heater 28 is controlled so that the temperature detected by the lid sensor 29 becomes 110 ° C. And the body heater 30 is heated and controlled. In addition, the process immediately proceeds to step S30, and the cooking control means 61
The failure detecting means 63 detects the failure of the lid sensor 29 based on the command from the.
When the detected temperature of 29 is lower than -20 ° C and continues for 1 second or more, the lid sensor failure detecting means 65 determines the failure of the lid sensor 29,
The induction coil 6 has priority over the control of the cooking control means 61.
7. All heating operations of the body heater 30 and the lid heater 28 are forcibly stopped (step S31). Also, step S1
In 8, the failure display of the pan sensor 9 is displayed via the LCD / LED display means 53, and the operation switch 47 is locked. Also in this case, as in the case of the inspection, it is preferable that the display of the LCD / LED display means 53 is different when the pan sensor 9 is out of order and the lid sensor 29 is out of order.

In step S30, when the temperature detected by the lid sensor 29 is -20 ° C or higher, it is determined that the lid sensor 29 is normal, and the process proceeds to step S33. Then, in step S33, when the purging stroke has passed for 15 minutes, the process proceeds to step S34, and a heat retaining process for controlling the inside of the pan 4 to a predetermined heat retaining temperature is performed.

This embodiment focuses on the fact that the operating environment such as the outside temperature cannot be specified during normal cooking, but the working environment can be specified to some extent during product assembly.
During cooking, a failure of the pan sensor 9 is detected after a predetermined time has passed after the induction coils 6 and 7 are energized. During inspection, immediately after the induction coils 6 and 7 are energized, the pan sensor 9 is detected.
Is configured to detect the failure of. That is, since the use environment at the time of cooking varies depending on the region, season, etc., for example, when the morning air is automatically cooked using a timer and the outside air temperature is significantly lower than −20 ° C., the cooking start is started. If the disconnection detection of the pan sensor 9 is performed immediately after that, there is a risk of erroneous detection, but in this embodiment, the disconnection detection of the pan sensor 9 is performed after the heating operation for raising the temperature to 120 ° C. or higher. Therefore, there is no fear that the wire will be erroneously determined to be disconnected. On the other hand, when assembled, the outside air temperature is -20 ° C.
Since the inspection can be performed under the conditions managed as described above, there is no risk of erroneous detection even if the disconnection detection of the pan sensor 9 is performed immediately after the heating operation is started under this condition. Therefore,
Unlike the conventional method, the detection of disconnection of the thermistor is immediately determined, so that the inspection time can be shortened and it is necessary to check other heating output and re-inspect the heating output adjustment even after the pan sensor 9 is replaced. Absent. Further, when the pan sensor 9 is disconnected, when the pan 4 is inspected in an empty state, a predetermined time elapses even though the pan sensor 9 is conventionally energized continuously at the maximum output. Until then, since the thermistor cannot detect that the pot is rapidly becoming hot, there was a risk that the body 1 of the vessel would be deformed or melted due to abnormal heating. Then, since the pan sensor 9 and the lid sensor 29 are detected for disconnection immediately after the start of the inspection, if the pan sensor 9 is disconnected, the heating of the induction coils 6 and 7 is forcibly stopped and the failure location is displayed. can do. For this reason, it is possible to safely perform empty cooking and energization.

In this embodiment, the condition for detecting the disconnection of the pan sensor 9 and the lid sensor 29 is judged by whether the detected temperature is lower than -20 ° C. With this configuration, even if the variation in the usage environment during normal cooking is even greater, it is possible to avoid the possibility of being erroneously detected as a broken wire. However, in this case, if the upper limit of the temperature used during normal cooking is 120 ° C., the temperature control range of the pan sensor 9 and the lid sensor 29 is expanded, and the resistance value change of the thermistor is A / D converted by the input device 46. Degradation at the time of heating, that is, the temperature control accuracy is deteriorated, and there are effects such as strong charring when cooking rice and large variations in the heat retaining temperature during heat retention. Therefore, in order to prevent the temperature control accuracy from deteriorating, it is desirable that the condition for detecting the disconnection of the pan sensor 9 and the lid sensor 29 is determined by whether the detected temperature is lower than -20 ° C as in the present embodiment.
Further, since the condition of this wire breakage detection depends on the lower limit environment in the assembly workshop, there is substantially no problem even if the detected temperature is less than -5 ° C as the judgment condition. Assuming that the resistance value of the thermistor changes linearly, the detection temperature range of the pan sensor 9 and the lid sensor 29 during A / D conversion is 256.
When divided into equal parts, when the detection temperature range is -50 ° C to 120 ° C, it is converted into 0.66 ° C units, but when the detection temperature range is -5 ° C to 120 ° C, it is converted into 0.49 ° C units. ,
The temperature control accuracy can be further improved.

As described above, the rice cooker of the present embodiment corresponds to claim 1, the pan 4, the induction coils 6 and 7 for heating the pan 4, and the pan sensor 9 for detecting the temperature of the pan 4. Based on the temperature detected by the pan sensor 9, the induction coils 6, 7 are energized to control cooking while controlling the energization amount and energization interval according to a predetermined heating pattern, and the induction coils 6, 7 are connected continuously or Inspection control means 62 for intermittently energizing,
The pan sensor 9 is provided with a failure detecting means 63 for judging a failure of the pan sensor 9 and stopping heating of the induction coils 6 and 7 when the pan sensor 9 has a temperature equal to or lower than a predetermined temperature.
During cooking by 61, the pan sensor 9 is detected for failure after a predetermined time has elapsed after the start of cooking, and during inspection by the inspection control means 62, failure of the pan sensor 9 is detected immediately after the start of inspection. Therefore, during normal cooking, by detecting disconnection of the pan sensor 9 after a lapse of a predetermined time from the start of heating, erroneous detection of the pan sensor 9 can be prevented and reliability can be improved. Further, at the time of inspection, the failure of the temperature detecting means is detected immediately after the start of the inspection, so that the entire inspection time can be shortened, and when the pan sensor 9 is disconnected, the heating of the induction coils 6 and 7 is immediately stopped. It is possible to prevent abnormal heating inside the main body 1. At the time of the inspection, since the use environment is controlled to some extent, there is no risk that the pan sensor 9 will be erroneously detected as being disconnected even if the failure of the temperature detecting means is detected immediately after the start of the inspection. In addition, it is possible to surely detect the failure of the pan sensor 9 both during cooking and during cooking.

Further, as an effect of the embodiment, in the structure of claim 1, the temperature detected by the pan sensor 9 is -20 ° C.
If the failure detection means 62 is configured to determine the failure of the pan sensor 9 when the value is less than the above, the action and effect of claim 1 can be achieved without deteriorating the temperature management accuracy. Further, if the failure detecting means 62 is configured to judge the failure of the pan sensor 9 when the temperature detected by the pan sensor 9 is less than −5 ° C., the temperature management accuracy can be further improved.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, it goes without saying that the present invention can be applied to rice cookers other than the induction heating type shown in the embodiments. Further, the same action and effect are exhibited in cookers other than rice cookers.

[0026]

The cooking device of the present invention comprises a pan, a pan heating means for heating the pan, a temperature detecting means for detecting the temperature of the pan, and the pan heating means based on the temperature detected by the temperature detecting means. A cooking control means for energizing and cooking while controlling an energization amount and an energization interval according to a predetermined heating pattern, an inspection control means for continuously or intermittently energizing the pot heating means, and a temperature detecting means having a predetermined temperature or less. In the case of, a failure detecting means for judging the failure of the temperature detecting means and stopping the heating of the pot heating means is provided, and the failure detecting means has passed a predetermined time after the start of cooking at the time of cooking by the cooking control means. After that, the failure detection of the temperature detection means is performed, and the failure detection of the temperature detection means is performed immediately after the start of the inspection at the time of the inspection by the inspection control means.
It is possible to prevent erroneous detection during cooking and improve reliability, and during inspection, shorten the inspection time and prevent abnormal heating, and in any case, reliably detect the failure of the temperature detecting means.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rice cooker showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the same.

FIG. 3 is a block diagram showing a processing procedure of a control sequence of the above.

FIG. 4 is a graph showing a temperature change and a current interruption control during the inspection.

FIG. 5 is a graph showing temperature change and interruption control during cooking.

FIG. 6 is a flowchart showing a procedure at the time of the inspection.

FIG. 7 is a flowchart showing a procedure for detecting a failure of the pan sensor during cooking.

FIG. 8 is a flowchart showing a procedure for detecting a failure of the lid sensor during cooking.

[Explanation of symbols]

 4 pan 6,7 induction coil (pot heating means) 9 pan sensor (temperature detection means) 61 cooking control means 62 inspection control means 63 failure detection means

Claims (1)

[Claims] 1. A pot and a pot heating means for heating the pot,
Temperature detecting means for detecting the temperature of the pot, and cooking control means for conducting electricity by controlling the energization amount and energization interval of the pot heating means in accordance with a predetermined heating pattern based on the temperature detected by the temperature detecting means for cooking. Inspection control means for energizing the pot heating means continuously or intermittently, and failure detection means for judging the failure of the temperature detecting means when the temperature detecting means is below a predetermined temperature and stopping the heating of the pot heating means The failure detection means detects a failure of the temperature detection means after a predetermined time has elapsed after the start of cooking during the cooking by the cooking control means, and the temperature immediately after the start of the inspection during the inspection by the inspection control means. A cooker characterized by detecting a failure of a detecting means.