JP2000268951A - Electromagnetic range - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly judge boiling of hot water when hot water is boiled in a boiling mode of large output in an electromagnetic range. SOLUTION: Temperature rising degree of a cooking material is obtained from detecting temperature of a temperature detecting part 14, and boiling of the cooking material is judged from a changing point instead of temperature rising degree itself. Even when heating output is high and temperature following capability is slow, boiling of the cooking material is correctly judged, and especially even when the temperature detecting part 14 is fixed under a top plate 7 which is a cooking material placing part, made of glass of poor heat conductivity, boiling can correctly be judged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an electromagnetic cooker.

[0002]

2. Description of the Related Art As a method of detecting boiling of hot water or the like in a heating cooker, a method disclosed in Japanese Unexamined Patent Application Publication No. 10-272058 is known.
This is a method for detecting a temperature equilibrium state at the time of boiling. Also, Japanese Patent Application Laid-Open No.
Japanese Patent Application Laid-Open No. 1335 discloses a technique for detecting a decrease in the temperature change rate below a predetermined value to determine boiling.

[0003]

However, in the former of such prior arts, the temperature detection unit has good temperature followability to the temperature of the food, or the degree of delay is small even if there is a delay time. Valid in some cases,
There is a problem that it is not possible to cope with the case where the temperature detection unit follows the boiling time of the food slowly. In other words, the boiling water keeps its temperature in an equilibrium state, but if the temperature following section of the temperature detecting section has a large delay, even if the hot water temperature reaches the equilibrium state, the detected temperature of the temperature detecting section will continue to rise. It is.

In the latter case of the prior art, if the time until boiling is short, it is difficult to catch the phenomenon that the rate of temperature rise gradually decreases, so that it is difficult to detect the boiling accurately with this conventional method. Met.

The present invention has been made in view of such conventional problems, and it is difficult to catch a phenomenon in which the rate of temperature rise decreases gradually, such as when the temperature follow-up property is poor and the heating output is large. Another object of the present invention is to provide an electromagnetic cooker capable of accurately detecting boiling.

[0006]

According to the first aspect of the present invention, there is provided an electromagnetic cooker comprising: a temperature detector provided below a food placing portion;
A heating control unit that determines a degree of temperature rise after the start of heating of the cooked food from the detected temperature detected by the temperature detection unit, and determines boiling of the cooked food based on the change point.

In the electromagnetic cooker according to the first aspect of the present invention, the degree of temperature rise of the cooked product is obtained from the temperature detected by the temperature detecting unit, and the boiling of the cooked food is determined not on the basis of the temperature rise itself but on the change point thereof. By doing so, it is possible to accurately determine the boiling of the food even when the heating output is high and the temperature tracking of the temperature detection unit is slow, and particularly as a food placement unit made of glass with poor heat conductivity. It is possible to accurately determine the boiling point even when the temperature detecting unit is attached below the top plate.

[0008] The electromagnetic cooker according to the second aspect of the present invention is the first aspect.
In the above, the differential temperature of the temperature detected by the temperature detection unit at predetermined time intervals is calculated for the degree of temperature rise, and a moving average value of two or more consecutive differential operation values is used. Is determined on the basis of the changing point of.

In the electromagnetic cooker according to the second aspect of the present invention, while utilizing the differential value of the detected temperature of the temperature detecting section which fluctuates greatly due to the electric noise, it is hardly affected by the electric noise. Boiling can be determined.

[0010] The electromagnetic cooker according to the third aspect of the present invention is the second aspect.
In the above, after the temperature detection unit detects a temperature exceeding a predetermined value, a moving average value of the differential operation value at the time when the predetermined value is detected is set as a comparison reference value, and is set in advance with respect to the comparison reference value. When the moving average value of the differential operation value reduced by the ratio is obtained, the boiling of the food is determined.

In the electromagnetic cooker according to the third aspect of the present invention, the moving average value of the time differential value of the temperature detected in a temperature zone in which the temperature of the cooked food increases by heating and the temperature increase is substantially stable is compared. Based on, and then determine the boiling when the moving average of the time derivative of the temperature decreases by a fixed ratio with respect to the comparison standard, even if the degree of temperature rise differs depending on the load of the food, Boiling can always be accurately determined without being affected by the load amount.

According to a fourth aspect of the present invention, there is provided an electromagnetic cooker.
In the method of (2), the temperature detected by the temperature detecting unit at every predetermined time is subjected to a second-order differential operation, and the boiling of the food is determined based on the second-order differential value.

[0013] In the electromagnetic cooker according to the fourth aspect of the present invention, the boiling point can be determined by accurately grasping the change point of the degree of temperature rise of the food.

According to a fifth aspect of the invention, there is provided an electromagnetic cooker.
In (4) to (4), the heating output is reduced to a predetermined output immediately after the boiling determination of the food or after the cooking is continued for a predetermined time after the boiling determination.

In the electromagnetic cooker according to the fifth aspect of the present invention, the hot water is heated with a particularly large heating output by reducing the heating output immediately after the boiling judgment of the food or after a predetermined time has elapsed after the boiling judgment. In such a case, it is possible to prevent a state in which splashes of bumping bubbles are scattered without boiling water without lowering the temperature of the hot water even after boiling.

According to a sixth aspect of the present invention, there is provided an electromagnetic cooker.
, A notifying unit is provided for notifying by sound or display when the heating output is reduced, so that a user at a distant place can be notified of boiling.

According to a seventh aspect of the present invention, there is provided an electromagnetic cooker according to the fifth aspect.
Or, in 6, after reducing the heating output, reheating is performed when the detection temperature detected by the temperature detection unit decreases, and water is added in a state where the heating output is reduced after boiling the cooked food. Even if the temperature of the hot water drops, it can be reheated automatically and boiled reliably.

[0018] The electromagnetic cooker according to the invention of claim 8 is the invention according to claim 1.
In (4) to (4), when the water heater mode is set by the user, the heating is stopped immediately after the boiling determination of the food or after heating for a predetermined time after the boiling determination.

In the electromagnetic cooker according to the present invention, when the water heater mode is set by the user, the water heater can be reliably controlled, and the boiling determination can be immediately performed.
Alternatively, by automatically stopping the heating after the heating for a predetermined time, energy saving can be achieved, and it is possible to prevent the empty heating in which the heating is performed even after the hot water evaporates.

The electromagnetic cooker according to the ninth aspect of the present invention is the first aspect of the present invention.
In (8) to (8), when the detected temperature of the temperature detection unit at the start of heating is higher than a predetermined determination temperature, the boiling determination is not performed, and the heating output is reduced when a predetermined time has elapsed from the start of heating. It is.

In the electromagnetic cooker according to the ninth aspect of the present invention, the continuous use of the electromagnetic cooker allows a predetermined time from the start of heating even when the previous heat remains in the cooker body and boiling cannot be determined. By lowering the heating output when passed, it is possible to boil the later cooked food,
It is also possible to prevent the user from noticing the boiling and continuing the boiling for a long time until the operation of stopping the heating, thereby achieving energy saving and ensuring safety.

According to a tenth aspect of the present invention, there is provided the electromagnetic cooker according to any of the first to ninth aspects, wherein the boiling determination is not performed when the degree of increase in the temperature detected by the temperature detector exceeds a predetermined value. .

In the electromagnetic cooker according to the tenth aspect, when the degree of increase in the temperature detected by the temperature detecting section exceeds a predetermined value and is large, the boiling determination is not performed. When cooking is performed in which the temperature is rapidly raised by heating, the boiling is not erroneously determined.

According to an eleventh aspect of the present invention, in the electromagnetic cooker according to any one of the first to tenth aspects, the temperature detecting unit is provided at a plurality of different places, and the heating control unit is one of the plurality of temperature detecting units.
The boiling determination is performed based on the highest detected temperature.

In the electromagnetic cooker according to the eleventh aspect of the present invention, even if the pan is displaced from the center or the pan is not a flat pan, the electromagnetic cooker is one of the plurality of temperature detection units. Boiling can be accurately determined by determining boiling based on the detected temperature of the temperature detecting unit that indicates a high detected temperature.

According to a twelfth aspect of the present invention, there is provided the electromagnetic cooker according to the eleventh aspect, wherein the temperature of the central portion of the cooked food is detected.
A second position for detecting the position of the food and the temperature of the surrounding area of the food.
The temperature detection unit is provided at two positions, and the temperature detected by the temperature detection unit provided at the second position is detected by the temperature detection unit provided at the first position. When the temperature is higher than a predetermined value, the boiling determination is not performed.

In the electromagnetic cooker according to the twelfth aspect, particularly when the pot bottom is curved and the temperature cannot be detected correctly, the shape of the pot bottom is determined based on the difference between the detected temperatures of the two temperature detecting sections. However, erroneous determination of boiling is prevented by not performing boiling determination.

According to a thirteenth aspect of the present invention, there is provided the electromagnetic cooker according to the first aspect, wherein the boiling determination is not performed after the heating is started, even when the boiling is performed by pressing a hot water key or the like. In this method, heating is performed for a predetermined time and then immediately or after heating for a predetermined time, the heating is stopped.

In the electromagnetic cooker according to the thirteenth aspect of the present invention, it is not desirable to continue the boiling mode for some reason even if the user presses a water heater key or the like to boil the water for the purpose of water heating. When it is determined that the heating has been completed, or by automatically stopping the heating after the heating for a predetermined time, energy saving and safety can be ensured.

[0030]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the appearance of an electromagnetic cooker according to a first embodiment of the present invention. At the front of the electromagnetic cooker 1, heating knobs 2a, 2b, 2c are attached, and a roaster door 4 for the roaster 3 and a roaster handle 5 for opening and closing the roaster door 4 are provided. On the top surface of the electromagnetic cooker 1, a left heater 6a, a center heater 6b, and a right heater 6c are provided for a three-hole stove specification. The top plate 7 is attached to the entire top surface. The left heater 6a and the right heater 6c are IH, and induction heating is performed by placing a pan made of an iron-based material thereon. Central heater 6
b is a radiant heater. The heating power (heating output) of each of the left heater 6a, the center heater 6b, and the right heater 6c is adjusted by the heating knobs 2a, 2b, and 2c.

Heating power indicator lamps 8a, 8b, 8c of the heater are provided on the top plate 7 of the electromagnetic cooker 1, and a power display, a roaster heating power display, a timer display are provided on the front, and a power on / off operation, tempura, etc. A display / operation unit 9 for setting a temperature control mode for cooking, setting a roaster, and setting a cooking timer is provided.

FIG. 2 shows the internal structure of the electromagnetic cooker 1. Under the top plate 7, there is a heating coil 11 in which a litz wire is spirally wound.
When a high frequency current is passed through the
An eddy current is generated in the bottom 12a of the second pot, and the food 13 can be heated.

Heating coil 11 under top plate 7
A temperature detecting element 14 is attached to a central portion surrounded by. When the pot bottom 12a is heated by the heating coil 11 and the temperature of the food 13 therein rises, the heat of the food is transmitted to the temperature detecting element 14 below the top plate 7 through the pot bottom 12a, and the temperature detecting element 14 It detects the temperature.

FIG. 3 shows a circuit configuration of the electromagnetic cooker 1. The electromagnetic cooker 1 has a built-in control circuit 21 composed of a microcomputer in which a predetermined heating control processing program is incorporated. The control circuit 21 receives key operation information from a key input unit 22, detected temperature information from a temperature detection element 14, input detection information for setting output power (watt W) of an inverter circuit 23 from an input detection unit 24, load detection. Load detection information as to whether or not a load is placed on the heating coil 11 is input as input information from the unit 25.

The control circuit 21 also uses the buzzer section 26 for key input confirmation sound, buzzer information used for notifying proper tempura temperature, and notification of completion of water heating, and uses the LED display section 27 for heating output, water heating setting, and the like. Display information,
Output setting information for operating the inverter circuit 23 through the driving unit 29 is output to the output setting unit 28 as output information.

FIG. 4 is an enlarged view of the display / operation unit 9 provided on the front panel of the electromagnetic cooker 1. The display / operation unit 9 includes a power supply display 9a, a roaster heating power display 9b, a timer display 9c, a water heater display 9d, and a tempura display 9e, a power on / off switch 9f, a temperature setting switch 9g for tempura cooking, and a water heater setting switch 9h. ,
A roaster set switch 9i and a timer set switch 9j are provided.

The control of the control circuit 21 in the electromagnetic cooking device having the above hardware configuration will be described below. The control of the control circuit 21 according to the first embodiment has the following features.

<Normal Amount of Boiling> As shown in FIG.
If the boiling mode is set by operating the boiling set switch 9h at t0, heating is started in the boiling mode (the heating output of the inverter circuit 23 at this time is 3 kW, which is larger than the heating output of 2 kW during normal cooking). . Then, the detection temperature detected by the temperature detection element 14 at every predetermined time (here, every 10 seconds) is differentiated, and a moving average value Dav (t) of ten consecutive differential operation values is obtained.

When the time T1 has elapsed after the start of heating and the temperature detecting element 14 detects a temperature exceeding a predetermined value (here, 80 ° C.), the moving average of the differential operation value at the time t1 when the predetermined value is detected. The value Dav (t1) is set as the comparison reference value D1. After that, the heating is continued, and at time t2 when the moving average value D1 / 2 of the differential operation value reduced by a predetermined ratio (here, 1/2) with respect to the comparison reference value D1 is obtained, the cooking 13 The boiling determination is performed, and the boiling indicator lamp is turned on as shown in FIG. After the boiling determination, the heating is continued for a predetermined boiling maintenance time T2 (here, 3 minutes), the output is reduced by a predetermined width (here, 600 W), and the heat retention heating is performed for a predetermined time T3 (here, 3 minutes). Min) and then stop heating. Then, as shown in FIG. 4C, the boiling lamp is turned off, and the end of the boiling heating is notified to the user by a buzzer.

<Small amount of boiling, re-boiling when water is added> As shown in FIG. 6, a state in which the amount of the food 13 in the pot 12 is small (for example, 1 liter, which is half of a normal amount of 2 liters) In the case where a large heating output exceeding the normal heating output of 2 kW is set by the heating knob and boiling is performed rapidly, the following control is performed.

If a heating output exceeding 2 kW during normal cooking is set at time t0, heating is started with a large output. Then, the detected temperature for each predetermined time detected by the temperature detecting element 14 is differentially calculated, and a moving average value Dav (t) of ten consecutive differentially calculated values is obtained.

When the time T11 has elapsed after the start of heating and the temperature detecting element 14 detects a temperature exceeding a predetermined value (here, 80 ° C.), the moving average of the differential operation value at the time t11 when the predetermined value is detected. The value Dav (t1) is set as the comparison reference value D1. After that, the heating is continued, and the boiling point of the food 13 is determined at the time t12 when the moving average value D1 / 2 of the differential operation value that has decreased from the comparison reference value D1 is obtained. After the boiling determination, the heating output is reduced to 2 kW, which is a normal heating output, to keep the temperature. At this time, the user is notified by a buzzer.

Thereafter, when water is added at time t13, both the differential operation value and its moving average value decrease. However, the moving average value of the differential value becomes equal to a predetermined water temperature decrease determination value D2 (here,-
When set to 1), re-boiling is determined and the inverter circuit 2
The heating output of No. 3 is increased to the original set output exceeding 2 kW, re-boiled by reheating for a predetermined time T4 (here, 7 minutes), and then reduced to a normal heating output of 2 kW to keep the temperature, and the buzzer is used. Notify the user of the reboil completion.

<Re-boiling> As shown in FIG. 7, when the cooked food is boiled in a state where the whole of the electromagnetic cooker 1 is at a high temperature for continuous use, or when heated (here, 80 ° C. or more). In the case of boiling the hot water again, control is performed as follows.

When the temperature detected by the temperature detecting element 14 exceeds a predetermined value of 80 ° C. at the time when heating is started at a heating output of 3 kW when the mode is set to the boiling mode, the boiling judgment based on the differential calculation and the averaging process is performed. And heating for a preset reboil time T21 (here, 10 minutes)
Thereafter, the heating output is reduced by 600 W for a predetermined time T2.
2 Keep warm (3 minutes in this case), then stop heating and notify user by buzzer.

Here, in order to re-boil the food in a high temperature state, when a heating operation with a large output is performed by a heating knob, the output is reduced to 2 kW after heating for 10 minutes, and a stop operation is performed. Until the heating is performed, the heating is continued at the 2 kW output.

The above-mentioned boiling heating control program is shown in FIG.
13 to the flowchart shown in FIG. This will be described in more detail as follows.

The operation starts when the power is turned on. First, it is determined whether or not the water heater key is pressed (step S0).
5).

If the water heater key is depressed, the water heater mode is entered, the water heater flag is set, the LED for water heater display is turned on, and the inverter output is set to a large output of 3 kW (steps S10, S15, S20).

If the water heater key has not been pressed in step S05, it is determined whether or not a heating start operation has been performed by the heating knob (step S25). If the heating output set by the heating knob is 2 kW or less, normal cooking is performed. Thus, the heating is continued by the set output until the stop operation is performed by the heating knob (Step S30,
S35). However, the setting output by the heating knob is 2
If it exceeds kW, the process proceeds to step S40 and subsequent steps, assuming that the mode is the water heater mode, similarly to the case where the water heater key is operated (step S30).

In the water heater mode, it is determined whether or not the temperature detected by the temperature detecting element 14 immediately after the start of the mode has exceeded a predetermined temperature of 80 ° C. (step S40). This is for judging whether the cooked food is boiled in a state where the whole of the electromagnetic cooker 1 is at a high temperature for continuous use, or whether the hot water is going to be reboiled. is there.

In step S40, since the water heater mode has been entered for the purpose of boiling normal low-temperature water, if the detected temperature does not exceed 80 ° C., the inverter stop processing P05 and the differential value averaging processing P10 are performed. Repeat (step S60).

As the heating is continued, the temperature detecting element 1
If the temperature detected by Step 4 exceeds 80 ° C., Step S60
Then, after branching to YES and setting the iron plate detection flag (step S65), based on the latest differential average value D1 at this point, a value D1 / 2 that is half of the value is stored as a boiling detection value (step S70). ).

Thereafter, while monitoring the differential average value Dav (t), the heating is continued until it falls below the boiling detection value D1 / 2 (steps S75, P05, P10).

The rise in temperature is stopped by boiling of the water or hot water in the cooked food, the degree of temperature rise of the temperature detected by the temperature detecting element 14 also becomes small, and the differential average value Dav (t) of the temperature rise becomes the boiling detection value D1 /. If the temperature is lower than 2, it is determined that the water is boiling.
(Here, 3 minutes) (Step S80,
S85) The output reduction process P15 is performed, and then the process proceeds to step S90.

If it is determined in step S40 in FIG. 8 that the water heating mode is set for the purpose of reboiling the relatively high temperature water, the process branches to YES, and a predetermined time T21 (here, set to 10 minutes) During the heating mode, heating was performed at 3 kW in the water heating mode, and when the heating setting exceeded 2 kW, heating was performed at the set output for a predetermined time T21 to boil, and when the time T21 passed, the output reduction process P15 was performed. Thereafter, the process proceeds to step S90 in FIG. 10 (step S4).
5, S50).

In the processing after step S90 in FIG. 10, first, the output 2 is reduced in the output reduction processing P15.
The process branches to YES or NO depending on whether the kW flag has been set, that is, whether the water heater key has been operated or whether the heating knob has been used for high-output heating.

In the case of the large output heating by the heating knob, YES is branched in step S90, and the heating is continued while 2 kW is continued.
The differential average value is used to determine whether the detected temperature has dropped due to the addition of water.
It is determined whether there is no change until 1) is cut (step S95). If water is added, a predetermined time T4 is determined.
(In this case, 7 minutes), re-heating by the original set output is performed (steps S100, S105, S110, P05, P
10). Then, when the predetermined time T4 has elapsed, the inverter output is reduced again to 2 kW, and the operation shifts to continuous heating (steps S110, S115, P10, P05).

On the other hand, in the case of the boiling mode using the water heater key, the process branches to NO in step S90, and the 3 kW heating is continued for a predetermined time T3 (here, 3 minutes) for keeping the heat (step S120, P05). The inverter is stopped, the water heater LED is turned off, the water heater completion buzzer is sounded to notify the user, and then the heating is stopped (steps S125, S130, S135).

In the above flowchart, the inverter stop process P05, the differential value averaging process P10,
The output stop processing P15 is as follows.

<Inverter stop processing P05> Here, the inverter stop processing P05 is as shown in FIG.
Heating is continued until the heating knob is stopped (NO in step P051). If the heating knob is stopped, the inverter circuit 23 is stopped (step P05).
2).

<Differential Value Averaging Process P10> The differential value averaging process is as shown in FIG. 12. First, the temperature detected by the temperature detecting element 14 is stored, and a timer having a predetermined period of 10 seconds is started. (Steps P101, P102), Timer is 1
After waiting for 0 seconds to count up, differentiation processing is performed (steps P103 and P104).

In the differential processing of P104, a value obtained by subtracting the stored detection temperature initially stored in the processing P10 from the temperature detected by the temperature detection element 14 (current detection unit temperature) when the 10-second timer expires. And the last 10
One differential value is stored in the differential value memory and stored in the last part.

After the differentiation process, it is not long before the water heater mode has been entered, and if the last ten differential values have not been stored in the differential value memory, the final differential value is temporarily used as a differential average value ( Step P105, P10
7). Conversely, if sufficient time has elapsed since the water heater mode was entered, the differential calculation has been executed ten or more times in the past, and the differential values from the latest to the last ten times have been stored in the differential value memory (YES in step P105). Then, the differential values for the last 10 past times are added and divided by 10 to obtain and store the differential average value (step P106).

When the normal differential average value is obtained,
It is checked whether or not the iron plate detection flag is set, and if it is not set, the process returns to use this differential average value for subsequent processing (N in step P108).
Branch to O).

If the iron plate detection flag is set in step P108, it is determined whether or not cooking such as iron plate grilling with a large temperature rise is being performed based on whether or not the latest differential average value is greater than 10. If it is larger (step P109), the boiling determination is stopped, the iron plate detection flag is cleared (step P110), and heating is continued by the set output until a stop operation is performed by the heating knob. That is, it is considered that the cooking is heating cooking with a large output such as teppanyaki, and the boiling determination is not performed, and the large output heating is continued (step P111).

Even if the iron plate detection flag is set in step P108, if the latest differential average value is 10 or less, the process directly returns to continue boiling determination (branch to NO in step P109).

<Output lowering process P15> Output lowering process P1
5 is as shown in FIG. 13. When the water heater flag is set by the water heater key, the inverter output is reduced by 600 W to notify the operation of the heat insulation mode by a buzzer, and the heat insulation timer is used for a predetermined time (here. Then
A timer count of 3 minutes is started (step P15)
1, P152, P153). On the other hand, when the water heater mode is not set, the buzzer informs the user that the output is to be reduced to 2 kW, which is the heating output for normal cooking, and sets a 2 kW output flag (step P15).
1, P154, P155).

As described above, according to the first embodiment, the degree of temperature rise of the cooking object is obtained from the temperature detected by the temperature detecting element 14, and the cooking is performed not on the basis of the temperature rise itself but on the basis of the change point. In order to determine the boiling of the object, the detected temperature of the temperature detecting element 14 for each predetermined time is differentiated, and further, the degree of temperature rise is obtained by a moving average value of the differential operation value,
When the temperature exceeds a predetermined temperature of 80 ° C., the boiling point is determined when the differential average value is reduced to a half of the differential average value, so that the cooking can be accurately performed even when the temperature tracking performance of the temperature detecting element 14 is slow. The boiling of the food can be determined, and the boiling can be accurately determined even when the temperature detecting element 14 is attached below the top plate 17 as a food mounting portion made of glass having poor heat conductivity. In addition, since the degree of temperature rise is determined based on the changing point of the moving average value of the differential value based on the detected temperature of the temperature detecting element 14 at every predetermined time, the detected temperature of the temperature detecting element 14 which fluctuates greatly due to electric noise is determined. Is less affected by electrical noise even when utilizing the differential value of, so that boiling determination can be performed more accurately.

Further, even after the boiling of the cooked food is determined, the heating output is reduced to the predetermined output after the heating for a predetermined time continuously. Without lowering the temperature of the hot water, it is possible to prevent the state in which the water drops are boiled and the bubbles are scattered. Further, since a sound or a display is issued when the heating output is reduced, it is possible to notify a user who is at a remote place of boiling. In addition, when heating with a heating output larger than the heating output for normal cooking for boiling water, stew is not necessary as in normal cooking, and the purpose is achieved by boiling the hot water, By automatically stopping the heating immediately after the boiling determination or after the heating for a predetermined time, energy saving can be achieved, and the empty heating in which the heating is performed even after the hot water has evaporated can be prevented.

Further, since boiling is determined, and the heating output is reduced and then the detected temperature is lowered and then automatically reheated, water is added in a state where the heating output is reduced after boiling the cooked food. Even if the temperature of the hot water drops, it can be automatically reboiled by reheating.

Further, when the temperature detected by the temperature detecting element 14 at the start of heating is higher than a predetermined judgment temperature of 80 ° C., no boiling judgment is performed, heating is performed for a predetermined time from the start of heating, and then the heating output is reduced. As the temperature decreases, the boiling point based on the change point of the average value of the differential operation value, such as when the previous heat remains in the cooking device body or when the hot water is re-boiled, is continuously used. Even in a state in which the determination cannot be made accurately, it is possible to reliably boil the cooked food afterwards, and it is also possible to prevent the user from continuing to boil for a long time until he notices the boiling and performs the heating stop operation,
Energy saving and safety can be ensured.

In addition, if the degree of increase in the temperature detected by the temperature detecting element 14 exceeds a predetermined value and is large, no boiling judgment is performed. There is no erroneous determination of boiling when it is performed.

Next, an electromagnetic cooker according to a second embodiment of the present invention will be described with reference to FIGS. The feature of the electromagnetic cooker according to the second embodiment is that the boiling determination is performed based on the average value of the second-order differential value of the temperature in order to determine the boiling based on the changing point of the degree of increase in the temperature detected by the temperature detecting element 14. In this respect, the other control processing is the same as in the first embodiment.

Therefore, the configuration of the electromagnetic cooker 1 of the second embodiment is the same as that of the first embodiment shown in FIGS. However, the boiling control program incorporated in the control circuit 21 is different.

Hereinafter, the boiling control by the electromagnetic cooker according to the second embodiment will be described.

<Normal Amount of Boiling> As shown in FIG. 14, if the mode is set to the boiling mode by operating the boiling set switch 9h at the time point t0, heating is started at a large output of 3 kW in the boiling mode. The predetermined time 1 detected by the temperature detecting element 14
A differential operation is performed on the detected temperature every 0 seconds, and a moving average value Dav (t) of ten consecutive differential operation values is obtained. Then, the differential average value Dav (t) is second-order differentiated by performing another differentiation process, and the average value DDav (t) of the second-order differential value is obtained.

Then, when the time T1 has elapsed after the start of the heating and the temperature detecting element 14 detects a temperature exceeding the predetermined value 70 ° C., the boiling judgment is made valid at the time t41. Thereafter, the average value DDav (t) of the latest second-order differential value is equal to the determination value DDref (here, −0.4
) Is monitored, and it is determined that the water has boiled at time t42 when the temperature becomes smaller than the determination value DDref.

After the boiling determination, the heating is continued for 3 minutes, which is a predetermined boiling maintenance time, and then the predetermined width 60
The output is reduced by 0 W, and the heat is kept for a predetermined time 3
Continue for only a minute, then stop heating.

<Small Boiling> As shown in FIG. 15, when a large heating output exceeding the normal heating output of 2 kW is set by the heating knob in a state where the amount of the food in the pan is small, the boiling is rapidly performed. Control is performed as follows.

If a heating output exceeding 2 kW during normal cooking is set at time t0, heating is started with a large output. Then, the detected temperature for each predetermined time detected by the temperature detecting element 14 is differentially calculated, and a moving average value Dav (t) of ten consecutive differentially calculated values is obtained. Then, the differential average value Dav (t) is further differentiated again to obtain 2
The differential is performed, and the moving average value DDav (t) is also obtained.

When the time T11 elapses after the start of heating and the temperature detecting element 14 detects a temperature exceeding a predetermined value of 70 ° C., the boiling judgment is made effective at t51. Thereafter, when the latest average value DDav (t) of the second-order differential value becomes smaller than the determination value DDref, the boiling determination is performed at timing t52.

After the boiling determination, the heating output is reduced to 2 kW, which is a normal heating output, to keep the temperature.

<Reboil> Electromagnetic cooker 1 for continuous use
In the case where the food is boiled in a state where it is at a high temperature, or in the case where hot water is reboiled, the same control as in the first embodiment shown in FIG. 7 is performed.

The above boiling heating control program is shown in FIG.
6 to 19 are as shown in the flowchart of FIG. FIG.
The first stage processing shown in FIG. 6 is the same as the first stage processing of the first embodiment shown in FIG. However, only the step number used is larger by 200 than in the case of the first embodiment. Further, inverter stop processing P05, differential value averaging processing P10, output reduction processing P1
5 is the same as that shown in FIGS. 11, 12, and 13, respectively.

In step S240 in FIG. 16, since the water heater mode has been entered for the purpose of boiling normal low temperature water, if the detected temperature does not exceed 70 ° C.,
Inverter stop processing P05 and differential value averaging processing P10
After that, the processing shown in FIG. 17 is started.

Here, the averaging process P20 of the second order differential value and the inverter stop process P05 are repeated until the temperature detected by the temperature detecting element 14 exceeds 70 ° C. (step S26).
0).

<Averaging Process P20 of Second Derivative Value> The averaging process P20 of the second differential is shown in FIG. 19. First, the averaging process P10 of the temperature differential value shown in FIG. 12 is performed to obtain the differential average value Dav ( Find and store t). Then, after waiting for the second-order differentiation timer to finish counting for a predetermined time (again, set to 10 seconds) (step P201), the latest differential average value newly obtained and the differential value one time earlier than that are obtained. The difference from the average value is taken, this is stored as the average value DDav (t) of the second-order differential value, and the routine returns (step P202).

Returning to the flowchart of FIG. 17, when the detected temperature exceeds 70 ° C. in step S260, the iron plate detection flag is set (step S265), and the latest average value DDav (t) of the second order differential value is determined as the judgment value. Monitor if it is smaller than DDref. If the latest average value DDav (t) of the second-order differential value is smaller than the determination value DDref, it is determined that boiling has occurred at that timing (step S27).
0).

After the boiling determination, the heating is continued for a predetermined time (here, 3 minutes), and thereafter, the output reduction process P15 is performed, and the process proceeds to step S300 in FIG. 18 (steps S280, S285, P15).

If the mode is set to the kettle mode for the purpose of reboiling the relatively high temperature water in step S240 in FIG. 16, the process branches to YES and the first process shown in FIG.
As in the case of the first embodiment, heating is performed at a high output of 3 kW for a preset time of 10 minutes, and after that time, an output reduction process P15 is performed.
The process proceeds to step S300 and subsequent steps (steps S245 and S250).

The processing of the flowchart shown in FIG. 18 is the same as the processing of the flowchart of FIG. 10 in the first embodiment. However, the step numbers are different.

This will now be described. Step S30
0, the output 2 kW in the output reduction process P15 in the preceding stage.
Depending on whether the flag is set, that is, whether the water heater key is operated or the heating knob is used for high power heating,
YES, branching to NO.

In the case of high output heating by the heating knob, the process branches to YES in step S300, and while the 2 kW heating is continued, it is determined whether or not the detected temperature has decreased due to the addition of water. It is determined whether or not the temperature has not changed until the value drops below the drop determination value D2 (here, -1) (step S305). If water is added, reheating is performed with the original set output for a predetermined time of 7 minutes. (Steps S310, S315, S320, P05, P1
0). Then, when a predetermined time has elapsed, the inverter output is reduced again to 2 kW, and the operation shifts to continuous heating (steps S110, S115, P10, P05).

On the other hand, in the case of the boiling mode using the water heater key, the flow branches to NO in step S300, and the 3 kW heating is continued for a predetermined time of 3 minutes for keeping the heat (steps S330, P05), and then the inverter is stopped. To turn off the water heater LED and sound the water heater completion buzzer to notify the user and stop heating (step S).
335, S340, S345).

Thus, in the electromagnetic cooker according to the second embodiment, the degree of temperature rise of the food is obtained from the temperature detected by the temperature detecting element 14, and the cooking is performed not on the basis of the temperature rise itself but on the basis of the change point. In order to determine the boiling of an object, the detection temperature of the temperature detection element 14 for each predetermined time is differentiated, and
Further, the degree of temperature rise is obtained from the moving average value of the differential operation value.
Since the boiling is determined based on the average value of the differential values, the boiling of the food can be accurately determined even when the temperature tracking performance of the temperature detecting element 14 is slow, and the glass is particularly made of glass having poor heat conductivity. Even when the temperature detecting element 14 is attached below the top plate 17 as a food placing portion, the boiling can be accurately determined. In addition, since the average value of the second-order differential value is obtained based on the moving average value of the differential value from the temperature detected by the temperature detecting element 14 at every predetermined time, and the boiling determination is performed based on the average value, the electrical noise is reduced. Thus, while utilizing the differential value of the detected temperature of the temperature detecting element 14 having a large fluctuation, it is hardly affected by electric noise, and therefore, the boiling determination can be performed more accurately.

Further, even after the boiling of the cooked food is determined, the heating output is reduced to the predetermined output after continuously heating for a predetermined time. Without lowering the temperature of the hot water, it is possible to prevent the state in which the water drops are boiled and the bubbles are scattered. Further, since a sound or a display is issued when the heating output is reduced, it is possible to notify a user who is at a remote place of boiling. In addition, when heating with a heating output larger than the heating output for normal cooking for boiling water, stew is not necessary as in normal cooking, and the purpose is achieved by boiling the hot water, By automatically stopping the heating immediately after the determination of boiling or after the heating for a predetermined time, it is possible to save energy, and it is also possible to prevent empty heating in which heating is performed even after the hot water has evaporated.

[0098] Further, since boiling is judged and the heating output is reduced and then the detected temperature is lowered and then automatically reheated, water is added in a state where the heating output is reduced after boiling the cooked food. Even if the temperature of the hot water drops, it can be automatically reboiled by reheating.

Further, when the temperature detected by the temperature detecting element 14 at the start of heating is higher than a predetermined judgment temperature of 80 ° C., boiling is not performed, heating is performed for a predetermined time from the start of heating, and then the heating output is reduced. Since it is lowered, by using continuously, it is impossible to make a boiling judgment based on the second-order differential operation value in the case where the previous heat remains in the cooking device main body side or when the hot water is re-boiled. Even if
Cooking can be reliably boiled, and it is also possible to prevent the user from continuing to boil for a long time until the user notices the boiling and performs a heating stop operation, whereby energy saving and safety can be ensured.

In addition, when the degree of increase in the temperature detected by the temperature detecting element 14 exceeds a predetermined value and is large, no boiling judgment is performed, so that the temperature rises rapidly due to high-output heating such as iron plate grilling. When cooking, boiling is not erroneously determined.

Next, an electromagnetic cooker according to a third embodiment of the present invention will be described with reference to FIGS. The feature of the third embodiment is that, as shown in FIG.
The first temperature detection element 14A and the second temperature detection element 14B are provided at two places approximately 10 cm apart from each other to detect the temperature of the bottom central portion 12A and the bottom peripheral portion 12B of the pan 12. When the detected temperature of the element 14A becomes 50 ° C. or higher, the detected temperature of the second
If the temperature is equal to or higher than 0 ° C., it is determined that boiling cannot be detected accurately by the first temperature detection element 14A because the bottom of the pot is curved as shown in the figure, and the heating timer is set to 10 ° C.
The point is that boiling is determined by the end of counting up of minutes.

The heating control of the electromagnetic cooker according to the third embodiment will be described below with reference to the flowcharts of FIGS.

The operation starts when the power is turned on. First, it is determined whether or not the water heater key is pressed (step S40).
5).

If the water heater key is depressed, the water heater mode is entered, the water heater flag is set, the LED for the water heater display is turned on, and the inverter output is set to the large output of 3 kW (steps S410, S415, S42).
0).

If the water heater key has not been pressed in step S405, it is determined whether or not a heating start operation has been performed by the heating knob (step S425). If the heating output set by the heating knob is 2 kW or less, normal cooking is performed. Thus, the heating is continued by the set output until the stop operation is performed by the heating knob (step S4).
30, S435). However, if the setting output by the heating knob exceeds 2 kW, the operation is regarded as the water heater mode, as in the case where the water heater key is operated.
The process proceeds to 440 and thereafter (step S430).

In the water heater mode, it is determined whether the detected temperature of the first temperature detecting element 14A immediately after the start of the mode does not exceed a predetermined temperature of 80 ° C. (step S440).
This is to determine whether the electromagnetic cooker 1 itself is continuously used in a state where the temperature is high, or whether the relatively high temperature water is not reboiled.

In step S440, since the water heater mode has been set for the purpose of boiling normal low-temperature water, if the detected temperature does not exceed 80 ° C., the detected temperature of the first temperature detecting element 14A becomes 50 ° C. The inverter stop process P05 and the differential value averaging process P10 are repeated until the difference exceeds (step S450).

If the detected temperature of the first temperature detecting element 14A exceeds 50 ° C. while the heating is continued, it is determined whether the detected temperature of the second temperature detecting element 14B does not exceed 80 ° C. Steps S450 and S455).

Here, when the detected temperature of the first temperature detecting element 14A exceeds 50 ° C., the second temperature detecting element 14A
If the detected temperature of B exceeds 80 ° C., it is considered that the bottom of the pot 13 is curved as shown in FIG. Similarly, continuous heating is performed for 10 minutes, which is a predetermined time T21, by the heating timer, and the output stop processing P
After performing step S15, the process proceeds to steps S490 and subsequent steps in FIG. 24 (steps S445 and S450).

In the judgments of steps S440 and S445, the bottom of the pot 12 is not curved as shown in FIG. 20, so that when the temperature detected by the first temperature detecting element 14A exceeds 50 ° C. If the detected temperature of the second temperature detecting element 14B does not exceed 80 ° C., step S in FIG.
Proceed to the process after 460 to continue heating (step S
460, P10, P05).

If the temperature detected by the first temperature detecting element 14A exceeds 80 ° C. while the heating is continued, the flow branches to YES in step S460, and the iron plate detection flag is set (step S465). Based on the latest differential average value D1 obtained in step (1), a value D1 / 2 that is half of the value is stored as a boiling detection value (step S470).

Thereafter, while monitoring the differential average value Dav (t), heating is continued until the differential average value Dav (t) falls below the boiling detection value D1 / 2 (steps S475, P05, P10).

The temperature rise is stopped by the boiling of the water or hot water of the cooked food, the degree of temperature rise of the temperature detected by the first temperature detecting element 14A also becomes small, and the differential average value of the temperature rise Dav (t)
If the temperature falls below the boiling detection value D1 / 2, it is determined that the water is boiling. If the determination is YES at step S475, the heating is further continued for a further predetermined time T2 of 3 minutes (steps S480 and S485), and the output lowering process is performed. Perform P15,
Subsequently, the process proceeds to step S490 in FIG.

In step S440 in FIG. 22, if the mode is set to the kettle mode while the temperature is relatively high, the flow branches to YES, and the preset time T21 is 10 minutes, and if the mode is the kettle mode, heating is performed at 3 kW. ,
If the heating setting exceeds 2 kW, heating is performed for 10 minutes, which is the time T21, at the set output, and the mixture is boiled.
(Steps S445 and S450).

In the processing after step S490 in FIG. 24, first, in the output reduction processing P15, the output 2 kW
Depending on whether the flag is set, that is, whether the water heater key is operated or the heating knob is used for high power heating,
YES, branching to NO.

In the case of the large output heating by the heating knob, the process branches to YES in step S490, and while the 2 kW heating is continued, it is determined whether or not the detected temperature has dropped due to the addition of water. Decrease judgment value D2-
Judgment is made based on whether or not there is no change until the value falls below 1 (step S495).
Is performed for 7 minutes, which is the original setting output (steps S500, S505, S510, P05, P1).
0). Then, when the predetermined time T4 has elapsed, the inverter output is reduced again to 2 kW, and the operation shifts to continuous heating (steps S510, S515, P10, P05).

On the other hand, in the case of the boiling mode using the water heater key, the flow branches to NO in step S490, and the 3 kW heating is continued for 3 minutes, which is the predetermined time T3, for keeping the heat (steps S520 and P05). The heating is stopped and the water heater LED is turned off, and the heating completion buzzer is sounded to notify the user, and then the heating is stopped (steps S525, S530, S535).

In the above flowchart, the inverter stop process P05, the differential value averaging process P10,
The output stop processing P15 is shown in FIGS. 11 to 13 similarly to the first embodiment.

As described above, according to the third embodiment, the degree of temperature rise of the food is obtained from the temperature detected by the first temperature detecting element 14A.
In order to determine the boiling of the food based on the change point,
Differential operation of the detected temperature of the first temperature detecting element 14A for each predetermined time is performed, and further, a degree of temperature rise is obtained by a moving average value of the differential operation value. Since the boiling is determined when the differential average value is reduced to a half of the differential average value, the boiling of the cooked food can be accurately determined even when the temperature following ability of the first temperature detecting element 14A is slow, and particularly, the heat conduction is performed. Even when the first temperature detecting element 14A is attached below the top plate 17 as a food placing portion made of poorly-quality glass, the boiling can be accurately determined. In addition, since the degree of temperature rise is determined based on the changing point of the moving average value of the differential value at the temperature detected by the first temperature detecting element 14A at every predetermined time, the first temperature which fluctuates greatly due to electrical noise. While utilizing the differential value of the detection temperature of the detection element 14A, it is hardly affected by electrical noise,
Therefore, boiling determination can be performed more accurately.

Further, even after the boiling of the cooked food is determined, the heating output is reduced to the predetermined output after continuous heating for a predetermined time. Without lowering the temperature of the hot water, it is possible to prevent the state in which the water drops are boiled and the bubbles are scattered. Further, since a sound or a display is issued when the heating output is reduced, it is possible to notify a user who is at a remote place of boiling. In addition, when heating with a heating output larger than the heating output for normal cooking for boiling water, stew is not necessary as in normal cooking, and the purpose is achieved by boiling the hot water, By automatically stopping the heating immediately after the determination of boiling or after the heating for a predetermined time, it is possible to save energy, and it is also possible to prevent empty heating in which heating is performed even after the hot water has evaporated.

Further, since boiling is judged and the heating output is reduced and then the detected temperature is lowered and then automatically reheated, water is added in a state where the heating output is reduced after boiling the cooked food. Even if the temperature of the hot water drops, it can be automatically reboiled by reheating.

Further, when the temperature detected by the first temperature detecting element 14A at the start of heating is higher than a predetermined judgment temperature of 80 ° C., the boiling judgment is not performed, and heating is performed for a predetermined time from the start of heating. Since the heating output is reduced, by using it continuously, even if the previous heat remains in the cooking device body and it is not possible to judge the boiling, or if the hot water is re-boiled, Cooking can be reliably boiled, and it is also possible to prevent the user from continuing to boil for a long time until the user notices the boiling and performs a heating stop operation, whereby energy saving and safety can be ensured.

In addition, when the degree of increase in the temperature detected by the first temperature detecting element 14A exceeds a predetermined value and is large, the determination of boiling is not performed. Boiling is not erroneously determined when cooking is performed.

In addition to these, in the third embodiment,
First temperature detecting element 14A and second temperature detecting element 14B
When the detected temperature of the first temperature detecting element 14A becomes 50 ° C. or higher and the detected temperature of the second temperature detecting element 14B is 80 ° C. or more, the heating timer is set to 10 Minutes to set a large output (3k in water heater mode)
W, otherwise the heating is performed at a setting output exceeding 2 kW), and the boiling is not performed by the first temperature detecting element 14A because the bottom of the pot is curved as shown in FIG. Even in this case, boiling can be ensured.

When the bottom of the pot 12 is protruded downward at the center, the boiling can be accurately determined by the first temperature detecting element 14A as in the case of the first embodiment. .

In the third embodiment, the first
The calculation of the differential temperature value, the calculation of the differential average value, and the determination of the boiling point are performed based on the temperature detected by the temperature detecting element 14A, but the present invention is not limited to this.
The detected temperature of A is compared with the detected temperature of the second temperature detecting element 14B, and the same heating control as in the first or second embodiment is performed by using the higher detected temperature. It can also be configured.

In addition, in the third embodiment, similarly to the second embodiment with respect to the first embodiment, instead of the boiling judgment based on the change point of the average value of the temperature differential value,
A configuration in which boiling determination is performed based on the second derivative of the temperature can be adopted.

In addition, in each of the above embodiments, the time setting, the temperature setting, the comparison value, and the reference value setting are not particularly limited to those illustrated, but can be changed. It is preferable to set the optimal one.

[0129]

As described above, according to the first aspect of the present invention,
From the temperature detected by the temperature detector, calculate the degree of temperature rise of the food,
By judging the boiling of the food based on the change point instead of the temperature rise itself, it is possible to accurately determine the boiling of the food even when the heating output is high and the temperature tracking performance of the temperature detection unit is slow. In particular, when a temperature detecting unit is attached below a top plate as a cooking object mounting unit made of glass having poor heat conductivity, boiling can be accurately determined.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the degree of temperature rise is differentiated with respect to the temperature detected by the temperature detecting unit at predetermined time intervals, and the differential is calculated two or more times continuously. The boiling point is determined based on the moving average value of the calculated value and the change point of the moving average value of the differential calculated value of the temperature. Therefore, the differential value of the temperature detected by the temperature detecting unit, which fluctuates greatly due to electrical noise, is used. However, it is less susceptible to electric noise, and therefore, the boiling determination can be performed more accurately.

According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, the degree of temperature rise of the cooked food due to heating is large, and the temperature detected in a temperature zone where the degree of temperature rise is almost stable is obtained. The moving average value of the time derivative is used as a comparison standard, and then, when the moving average value of the time derivative value of the temperature decreases by a fixed ratio with respect to the comparison standard, boiling is determined. Even if the rise is different,
Boiling can always be accurately determined without being affected by the load amount.

According to the invention of claim 4, in addition to the effect of the invention of claim 1, the detected temperature of the temperature detecting unit at every predetermined time is second-order differentially operated, and the cooked food is calculated based on the second-order differential value. Is determined, the point of change in the degree of temperature rise of the food can be accurately grasped to determine the boiling.

According to the fifth aspect of the present invention, in addition to the effects of the first to fourth aspects, the heating output is reduced to a predetermined value immediately after the boiling of the cooked food or for a predetermined time continuously after the boiling determination. Since the power is reduced to the output, especially when heating hot water with a large heating output, it does not lower the temperature of the hot water even after boiling, and also prevents the state where the water splashes as it is boiled and bubbling be able to.

According to the invention of claim 6, in addition to the effect of the invention of claim 5, the notifying section for notifying by sound or display when the heating output is reduced is provided, so that a user who is at a remote place is provided. It can signal boiling.

According to the invention of claim 7, according to claim 5 or 6,
In addition to the effects of the invention, after the heating output is reduced, reheating is performed when the detection temperature detected by the temperature detection unit is reduced, so that water is added in a state where the heating output is reduced after boiling the cooked food. Even if the temperature of the hot water drops, it can be re-boiled by reheating.

According to the eighth aspect of the present invention, in addition to the effects of the first to fourth aspects of the present invention, it is possible to reliably control the boiling of the hot water when the user sets the hot water, and to immediately determine the boiling by judging the boiling. Alternatively, by automatically stopping the heating after the heating for a predetermined time, energy saving can be achieved, and it is possible to prevent empty heating in which heating is performed even after the hot water has evaporated.

According to the ninth aspect of the invention, in addition to the effects of the first to eighth aspects, when the temperature detected by the temperature detector at the start of heating is higher than a predetermined determination temperature, the boiling determination is performed. Without heating, the heating output is reduced when a predetermined time has elapsed from the start of heating, so if it is used continuously, boiling hot water will re-boil or the previous heat will remain on the cooking device body side and boil As in the case where the food is boiled in a state where the determination cannot be performed, the food can be surely boiled even in a state where the boiling determination based on the change point of the temperature differential value cannot be accurately performed. Can be prevented from continuing to boil for a long time until the operation of stopping the heating is noticed, and energy saving and safety can be ensured.

According to the tenth aspect, the first to ninth aspects are described.
In addition to the effects of the invention, cooking is not performed when the degree of increase in the temperature detected by the temperature detection unit exceeds a predetermined value, so that the temperature is rapidly increased by heating, such as iron plate grilling. Erroneous determination of boiling is not performed.

According to the eleventh aspect, claims 1 to 1 are provided.
In addition to the effects of the invention of 0, since the temperature control unit is provided at a plurality of different places, and the heating control unit performs the boiling determination based on the highest detected temperature among the plurality of temperature detection units, the pan is located at the center. Even in the case where the pan is shifted or the pan is not a flat pan, the boiling is determined based on the detected temperature of the temperature detecting unit which shows the highest detected temperature among the plurality of temperature detecting units. This makes it possible to accurately determine boiling.

According to the twelfth aspect of the invention, in addition to the effects of the eleventh aspect, in addition to the first position for detecting the temperature of the central portion of the food and the temperature of the peripheral portion of the food, the first position is detected. Temperature detectors are provided at two places with the second position.
The temperature detected by the temperature detector provided at the position
If the temperature is higher than the detection temperature of the temperature detection unit provided at the position, the boiling judgment is not performed. By judging the shape of the pot bottom based on the difference between the temperatures detected by the temperature detectors and not determining the boiling, erroneous determination of boiling can be prevented.

According to the thirteenth aspect of the present invention, in addition to the effect of the first aspect, even when the user presses a water heater key or the like to boil the water for the purpose of boiling the water, the water is boiled for some reason. When it is determined that it is not desirable to continue the mode, or by automatically stopping the heating after the heating for a predetermined time, energy saving and safety can be ensured.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the above embodiment.

FIG. 3 is a block diagram of a circuit in the above embodiment.

FIG. 4 is a front view of the display / operation unit according to the embodiment.

FIG. 5 is an explanatory diagram showing boiling heating control of a normal amount of hot water according to the embodiment.

FIG. 6 is an explanatory diagram showing boiling heating control of a small amount of hot water according to the embodiment.

FIG. 7 is an explanatory diagram showing reheating control in a high temperature state according to the embodiment.

FIG. 8 is a flowchart of the first stage of the heat treatment according to the embodiment.

FIG. 9 is a flowchart of a second stage of the heat treatment according to the embodiment.

FIG. 10 is a flowchart of a third stage of the heat treatment according to the embodiment.

FIG. 11 is a flowchart of an inverter stop process according to the embodiment.

FIG. 12 is a flowchart of a differential value averaging process according to the embodiment.

FIG. 13 is a flowchart of an output reduction process according to the embodiment.

FIG. 14 is an explanatory diagram illustrating boiling heating control of a normal amount of hot water according to the second embodiment of the present invention.

FIG. 15 is an explanatory diagram showing boiling heating control of a small amount of hot water according to the embodiment.

FIG. 16 is a flowchart of a first stage of the heat treatment according to the embodiment.

FIG. 17 is a flowchart of a second stage of the heat treatment according to the embodiment.

FIG. 18 is a flowchart of a third step of the heat treatment according to the embodiment.

FIG. 19 is a flowchart of a second-order differential value averaging process according to the embodiment.

FIG. 20 is a sectional view of a third embodiment of the present invention.

FIG. 21 is an explanatory diagram showing boiling heating control according to the embodiment.

FIG. 22 is a flowchart of a first stage of a heat treatment according to the above embodiment.

FIG. 23 is a flowchart of a second stage of the heat treatment according to the embodiment.

FIG. 24 is a flowchart of a third step of the heat treatment according to the embodiment.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic cooker 2a, 2b, 2c heating knob 3 roaster 4 roaster door 5 roaster handle 6a, 6b, 6c heater 7 top plate 8a, 8b, 8c display lamp 9 display / operation unit 11 heating coil 12 pot 13 cooking material 14 temperature Detection element 14A First temperature detection element 14B Second temperature detection element 21 Control circuit 22 Key input unit 23 Inverter circuit 24 Input detection unit 25 Load detection unit 26 Buzzer unit 27 LED display unit 28 Output setting unit 29 Drive unit

Continued on the front page (72) Inventor Hidetake Hayashi 991 Anadacho, Seto-shi, Aichi F-term in Aichi Plant, Toshiba Corporation (reference) 3K051 AB04 AC33 AD04 AD13 AD29 AD39 BD04 CD14 CD15 CD38

Claims (13)

[Claims] 1. A temperature detecting section provided below a food placing section, and a degree of temperature rise after the start of heating of the food is obtained from a detected temperature detected by the temperature detecting section, and based on a change point thereof. An electromagnetic cooker comprising: a heating control unit that determines boiling of the food. 2. The method according to claim 1, wherein a differential operation of a temperature detected by the temperature detection unit at predetermined time intervals is performed for the degree of temperature increase, and a moving average value of two or more consecutive differential operation values is used. 2. The electromagnetic cooker according to 1. 3. After the temperature detecting section detects a temperature exceeding a predetermined value, a moving average value of the differential operation value at the time when the predetermined value is detected is set as a comparison reference value, and 3. The electromagnetic cooker according to claim 2, wherein when the moving average value of the differential operation value reduced by a preset ratio is obtained, the boiling of the food is determined. 4. The method according to claim 1, wherein a second-order differential operation is performed on a temperature detected by the temperature detecting unit at predetermined time intervals, and the boiling of the food is determined based on the second-order differential value.
An electromagnetic cooker according to claim 1. 5. The heating output is reduced to a predetermined output immediately after the boiling of the food is determined or after the boiling is continued for a predetermined time. Induction cooker. 6. The electromagnetic cooker according to claim 5, further comprising a notifying unit for notifying by sound or display when the heating output is reduced. 7. The electromagnetic cooker according to claim 5, wherein after the heating output is reduced, reheating is performed when the temperature detected by the temperature detecting unit decreases. 8. The method according to claim 1, wherein when the water heating mode is set by a user, the heating is stopped immediately after the boiling of the food is determined or after heating for a predetermined time after the boiling is determined. An electromagnetic cooker according to any one of claims 1 to 4. 9. When the temperature detected by the temperature detector at the start of heating is higher than a predetermined determination temperature, the boiling determination is not performed, and the heating output is reduced when a predetermined time has elapsed from the start of heating. The electromagnetic cooker according to any one of claims 1 to 8, wherein: 10. The electromagnetic cooker according to claim 1, wherein the boiling determination is not performed when the degree of increase in the temperature detected by the temperature detector exceeds a predetermined value. . 11. The heating control unit comprising a plurality of different temperature detecting units, wherein the heating control unit performs the boiling determination based on the highest detected temperature among the plurality of temperature detecting units. The electromagnetic cooker according to any one of 1 to 10. 12. The temperature detecting section is provided at two positions, a first position for detecting a temperature of a central portion of the food and a second position for detecting a temperature of a peripheral portion of the food. When the detected temperature of the temperature detecting unit provided at the second position is higher than the detected temperature of the temperature detecting unit provided at the first position by a predetermined value or more, the boiling determination is not performed. The electromagnetic cooker according to claim 11, characterized in that: 13. After a heating mode is set by a user and heating is started, if it is determined that the boiling determination is not performed, heating is performed for a predetermined time and immediately thereafter, or after heating is performed for a predetermined time. The electromagnetic cooker according to claim 1, wherein heating is stopped.