JP3223153B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device such as an electromagnetic cooker, and more particularly to a cooking device for controlling the temperature of a cooking pot to heat cooking oil contained in the cooking pot for cooking. Related to the device.

[0002]

2. Description of the Related Art A cooking device heats a food in a cooking pot by heating the cooking pot. When cooking food with cooking oil in a cooking pot using such a heating cooking device,
While heating the edible oil to a temperature suitable for cooking,
It must be kept below the ignition temperature of the edible oil. Therefore, in the cooking device, controlling the temperature of the cooking oil in the cooking pot is important.

Originally, it is preferable that the temperature control of the cooking oil in the cooking pot in the heating cooking apparatus is performed while a temperature meter of the cooking oil is directly inserted into the cooking pot and the temperature of the cooking oil is directly measured.
However, it is generally considered unfavorable to insert a thermometer into a cooking pot for sanitary reasons or as an obstacle to cooking. From this, in the conventional heating cooking device, the temperature control of the cooking oil in the cooking pot is performed by estimating the temperature of the cooking oil in the cooking pot based on the detection temperature of the pot temperature measuring means for measuring the temperature of the cooking pot. This has been done by controlling the temperature of the cooking pot while doing so.

[0004] However, in the conventional cooking device,
The material and shape of the cooking pot used affect the heat transfer from the cooking oil, and if the temperature of the cooking oil in the cooking pot was uniformly estimated from the temperature detected by the pot temperature measurement means, In some cases, the oil temperature could not be controlled accurately.

The present invention has been conceived in view of the above circumstances, and has as its object to control the temperature of a cooking pot without inserting a thermometer into the cooking pot during cooking. To provide a cooking device capable of controlling the temperature of edible oil.

[0006]

According to a first aspect of the present invention, there is provided a heating cooking apparatus comprising: a cooking pot temperature measuring means for measuring a temperature of a cooking pot fixed in the cooking apparatus; And an oil temperature measuring means for measuring the temperature of the cooking oil in the cooking pot, and calculating a temperature difference between the measured temperatures of the pot temperature measuring means and the oil temperature measuring means prior to actual cooking. a temperature difference calculating means for, with the temperature difference storage means for storing the temperature difference calculated by said temperature difference calculation means, the temperature
Based on the temperature difference stored in the difference storage means, the set temperature
Control temperature determination for determining the control temperature of the cooking pot corresponding to
Setting means, and the control temperature determined by the control temperature determining means.
Actual cooking based on the temperature measured by the pan temperature measuring means.
And temperature control means for executing

According to the first aspect of the present invention, the difference between the temperature measured by the pot temperature measuring means and the temperature of the edible oil in the cooking pot can be stored prior to cooking. The control temperature of the cooking pot can be determined based on the difference. That is, the temperature of the cooking pot during cooking is controlled based on the difference between the temperature measured by the pot temperature measuring means actually used for cooking and the temperature of the cooking oil in the cooking pot.

Thus, the temperature of the cooking oil in the cooking pot can be controlled by controlling the temperature of the cooking pot without inserting a thermometer in the cooking pot during cooking.

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1. FIG. 1 is a diagram illustrating an appearance of an electromagnetic cooker as an example of a heating cooking device. The electromagnetic cooker 1 includes a main body 1a that houses a heating coil and the like to be described later, an operation panel 2 for inputting information to be operated by a user, a top plate 3 for placing a pan 5,
Power cord 4 for guiding power from household power supply to electromagnetic cooker 1
And The electromagnetic cooker 1 is of a type that is used by being installed on a table. FIG. 2 shows the electromagnetic cooker 1 installed on a table.

Referring to FIG. 2, electromagnetic cooker 1 includes a top plate 3
Is formed on the same plane as the upper surface 100a of the table 100, and the operation panel 2 is
00b is installed on the table 100 so as to form the same plane as 00b. In addition, the main body 1 a of the electromagnetic cooker 1 is stored in the table 100. Such an electromagnetic cooker 1 is, for example, installed on a table in a restaurant seat of a restaurant in order to allow a customer himself to cook fried food and cook pots.

FIG. 3 is a diagram showing the configuration of the operation panel 2. The operation panel 2 controls a fire key 16 operated during normal heating such as boiled cooking, and a certain amount of food such as food oil (hereinafter simply referred to as “oil”) in the pan 5 during cooking of fried food. And a lift key 18 which is operated when maintaining at a high temperature. The operation panel 2 further includes:
Timer key 13 for setting the timer and timer key 1
A display unit 14 for displaying the time and the like set by 3;
A heating / temperature lamp 15 for displaying a heating state by the fire key 16 or the lifting key 18 and a fire state indicator lamp 17 for indicating that the fire key 16 has been pressed.
And a raise status indicator lamp 19 indicating that the raise key 18 has been pressed, and an off key 2 for terminating the heating.
0, a heating lamp 2 indicating that a heating operation is being performed
1 is provided. In addition, as will be described later, the electromagnetic cooker 1 can store a temperature difference between the pot 5 and the oil in the pot 5 when the pot 5 containing a certain amount of oil is heated. And
The operation panel 2 includes a lift setting key 22 that is pressed when the electromagnetic cooker 1 stores the temperature difference, and a setting state indicator lamp 2 that indicates that the temperature difference is stored.
3, a lift automatic key 24 which is depressed when cooking the food using the stored temperature difference, and a state in which the food cooking is performed using the stored temperature difference. An automatic status indicator lamp 25 is provided.

FIG. 4 is a diagram schematically showing an electric circuit of the electromagnetic cooker 1. Referring to FIG. 4, a circuit constituting electromagnetic cooker 1 includes a power cord (power plug) 4 connected to an external AC power supply and electromagnetic cooker 1 from an external AC power supply.
41, a switch 42 for opening and closing the entire circuit, a transformer 43, and a rectifier circuit 4 for converting AC supplied from the power cord 4 into DC.
4, a smoothing coil 45, a smoothing capacitor 46, a heating coil 47 connected to the rectifier circuit 44 and used for heating an object to be heated such as the pan 5, a resonance capacitor 48, a transistor 49, and an on / off of the transistor 49. A drive circuit 50 for controlling turning off and a microcomputer 51 connected to the drive circuit 50 are mainly included.

A damper diode 49a is connected in parallel to the transistor 49. On the lower surface of the top plate 3, there is provided a pan temperature measuring means for detecting the temperature of the pan 5 on the top plate 3, that is, a thermistor 3a. The thermistor 3a
It is connected to the temperature detection circuit 52. Temperature detection circuit 52
Is connected to the microcomputer 51 and, when receiving an instruction from the microcomputer 51 to detect the temperature of the thermistor 3a, sends the temperature information of the thermistor 3a to the microcomputer 51 via the A / D conversion circuit 53.

As will be described later, the electromagnetic cooker 1
The difference between the measured temperature of the thermistor 3a and the temperature of the oil in the pan 5 when the pan 5 containing a certain amount of oil is heated can be stored. The memory 59 connected to the microcomputer 51 stores the temperature difference. In addition, the electromagnetic cooker 1 has a pot 5 for measuring oil temperature and the like.
It further includes a temperature probe 57 inserted therein. The temperature detection circuit 58 is connected to the temperature probe 57, the microcomputer 51, and the A / D conversion circuit 53, and receives an instruction to detect the temperature of the temperature probe 57 from the microcomputer 51, via the A / D conversion circuit 58. Then, the temperature information of the temperature probe 57 is sent to the microcomputer 51. The temperature probe 57 is detachable from the electromagnetic cooker 1. And the temperature probe 57
Thus, the temperature of the cooking oil in the cooking pot is measured, and an oil temperature measuring means detachable from the cooking device is constituted.

The microcomputer 51 includes an operation panel 2, a power supply circuit 54 for supplying a constant voltage power to the microcomputer 51, and a display controller 56 for controlling lighting of various lamps of the operation panel 2. And are connected. The microcomputer 51 includes a timer circuit and an audio circuit (not shown). The timer circuit measures time, and the audio circuit performs audio notification when time measurement by the timer circuit is completed or when the temperature detected by the thermistor 3a or the temperature probe 57 reaches a target temperature described later. Reference numeral 55 denotes a current transformer for detecting a current value, which is connected to the drive circuit 50.

In the electromagnetic cooker 1, when the fire key 16 is pressed, the microcomputer 51 first turns on the switch 42 by using the relay 42a, and intermittently turns on the transistor 49 via the drive circuit 50. Turn on
The heating coil 47 is energized intermittently. At this time, the microcomputer 51 turns on the heating lamp 21 and the ignition indicator 17 via the display control unit 56. Further, in the electromagnetic cooker 1, when the lift key 18 and the lift setting key 22 or the lift automatic key 24 are pressed, the heating coil 47 is similarly intermittently energized. At this time, the microcomputer 51
Via the display control unit 56, the lamps 14, 15, 17, 1
9, 21, 23, and 25 are turned on as needed.

In the electromagnetic cooker 1, when the heating coil 47 is energized, lines of magnetic force are generated. Then, when the generated lines of magnetic force pass through the pan 5 made of iron or the like on the top plate 3, due to Joule heat generated by the metal resistance of the pan 5 due to the eddy current,
The pan 5 is heated.

The microcomputer 51 determines whether or not an appropriate object to be heated such as the pan 5 is placed on the top plate 3, and only when it is determined that the object is placed, as described above. The heating coil 47 is energized. Whether or not an appropriate object to be heated such as an iron pot 5 is placed on the top plate 3 is determined as follows.

The microcomputer 51 stores a current value expected to be detected by the current transformer 55 when a pot suitable for heating by the electromagnetic cooker 1 is placed on the top plate 3 as an appropriate value. ing. Then, it is determined whether the current value detected by the current transformer 55 is equal to or more than the appropriate value. If it is determined that the detection result of the current transformer 55 is smaller than the appropriate value, it is determined that an appropriate object to be heated such as an iron pot is not placed on the top plate 3. When it is determined that the detection result is equal to or more than the appropriate value, it is determined that an appropriate object to be heated is placed on the top 3.

2. Next, the operation of the electromagnetic cooker 1 will be described. FIG.
4 is a flowchart of a main routine of the microcomputer 51.

First, the microcomputer 51 executes S1
It is determined whether any of the keys on the operation panel 2 has been pressed. If it is determined that one of the keys has been pressed, it is determined in S2 whether or not the pressed key 16 has been pressed. If it is the fire key 16, S3
Then, after performing the fire control process, the process ends. In the electromagnetic cooker 1, the degree of heating of the electromagnetic cooker 1, “strong”, “medium” or “weak”, can be set by the number of times the fire key 16 is pressed. Note that the power supplied to the heating coil 47 differs depending on the set degree of heating.

At S2, what was pressed was the fire key 16
If the microcomputer 51 determines that the
Proceeding to S4, it is determined whether or not the pressed key 18 is pressed. If it is determined that the lifting key 18 has been pressed, the process proceeds to S5, and further waits for pressing of any key on the operation panel 2. If it is determined in S5 that any key has been pressed, the process proceeds to S6, and if it is determined that the pressed key is not the lift setting key 22,
Proceeding to S8, it is determined whether or not the pressed key is the automatic key 24 for raising. If it is not the automatic key 24, the process is terminated.

On the other hand, if it is determined in S6 that the key pressed is the raise setting key 22, the process proceeds to S7, enters the learning mode, and ends the process. If it is determined that the key pressed in S8 is the automatic key 24, the process proceeds to S9, and it is determined whether the learning value is stored in the memory 59 in a learning mode described later. If it is determined that the learning value is stored, the process ends after entering the review mode in S10. If it is determined that the learning value is not stored, an error is notified in S91, and the process is terminated. As a mode of error notification,
For example, all lamps on the operation panel 2 may blink for a certain period of time.

Here, the learning mode means the electromagnetic cooker 1
However, the temperature of the pot 5 heated with a certain amount of oil and the temperature of the oil in the pot 5 is measured using the temperature probe 57 inserted in the pot 5 and the thermistor 3a, and the temperature difference between them is calculated. In this mode, the temperature difference is stored in the memory 59. The review mode means that the temperature difference between the temperature information of the thermistor 3 a and the temperature stored in the memory 59 is stored in the electromagnetic cooker 1 without actually inserting the temperature probe 57 into the pot 5 when cooking the fried food. In this mode, the temperature of the oil in the pan 5 is controlled. The operation of the electromagnetic cooker 1 in these modes will be described in detail below.

3. Processing in Learning Mode Next, processing in the learning mode of the electromagnetic cooker 1 will be described, including the operation in the mode.

(1) Relationship between “Material of pot” and “Difference between measured temperature of pot and temperature of oil” In the electromagnetic cooker 1, when the heating coil 47 is energized, the inside of the pot 5 is mainly The food in the pot 5 is heated. When the pot 5 is heated, generally,
The temperature near the outside of the pot 5 measured by the thermistor 3a is
The temperature of the food inside will be lower. In the cooking of the present embodiment, the temperature measured by the thermistor 3a of the pan 5 (hereinafter, simply referred to as the "measured temperature of the pan 5") and the pan 5 are used.
Attention is paid to the fact that the temperature difference of the oil in the inside changes due to the change of the material and the like of the pot 5.

Actually, in the electromagnetic cooker 1, using different pots of pots, the measured temperature of the pot 5 in the temperature range (about 130 ° C. to 190 ° C.) in which the pot 5 is heated at the time of cooking the fry. When the temperature difference of the oil in the pan 5 was measured, the result as shown in FIG. 6 was obtained. In FIG. 6, the horizontal axis indicates the temperature of the pan 5 measured by the thermistor 3a (hereinafter referred to as “Tt”), and the vertical axis indicates the temperature of the oil measured by inserting the temperature probe 57 into the pan 5 (hereinafter “Tt”). Tt ”) minus Tt. Here, Tp is measured about 10 minutes after the value of Tt is stabilized, as is measured after the oil temperature is stabilized. Also, in FIG.
Represents measured values for a three-layer pot (aluminum-stainless steel-aluminum), ◇ represents a measured value for a cast pot, and △ represents a measured value for an enamel pan. In addition, these three types of materials are materials of a pot used in a general electromagnetic cooker.

From FIG. 6, in the temperature range in which the pot 5 is expected to be heated in the cooking of the fried food, the measured temperature of the pot 5 and the pot represented by “Tp-Tt” for each material of the pot 5 5
It can be seen that the difference from the temperature of the oil inside is almost constant. That is, the temperature of the oil in the pan 5 is higher than the measured temperature of the pan 5 by about 12 ° C. for the three-layer pan, about 22 ° C. for the cast pan, and about 28 ° C. for the enamel pan. Then, in the cooking of the present embodiment, prior to the actual cooking, the thermistor 3
a and the temperature of the oil in the pot 5 are measured using the temperature probe 57 and the difference between these temperatures is stored. In actual cooking, the temperature difference and the temperature of the pot 5 to be measured at any time during cooking are measured. The temperature of the oil in the pot 5 is controlled without using the temperature probe 57. The learning mode is a mode in which the temperature of the pot 5 and the temperature of the oil in the pot 5 are measured using the thermistor 3a and the temperature probe 57 before the actual cooking, and the difference is stored, that is, the pot 5 and the pot This is a mode in which the temperature difference of the oil in 5 is measured and stored.

(2) Operation in Learning Mode The operation of the electromagnetic cooker 1 in the learning mode will be described based on the processing of the microcomputer 51. FIG. 7 is a flowchart of a subroutine of the learning mode in S7 of FIG. When the electromagnetic cooker 1 enters the learning mode, a pot 5 containing a predetermined amount of oil is placed on the top plate 3, and a temperature probe 57 is inserted into the pot 5. It is necessary to be. In addition, the above-mentioned predetermined amount means an amount used in normal cooking.

Referring to FIG. 7, first, in step S701, the microcomputer 51 performs processing for setting a target temperature (hereinafter, referred to as "Tpg") of the temperature probe 57 to 200 ° C., and proceeds to S702. Here, Tpg is pot 5
Is the target temperature at which the detection temperature of the temperature probe 57 is reached by heating the temperature probe. In other words,
It is the temperature at which the oil in the pot 5 is to be heated. Also, 200
The ° C. is an example of the temperature at which the oil in the pan 5 is heated in the actual cooking of the fry.

In S702, 1200 is applied to the heating coil 47.
W is energized, and the process proceeds to S703. In S703, it is determined whether or not the detected temperature (Tp) of the temperature probe 57 has reached 200 ° C., and if it is determined that the temperature has reached, the process proceeds to S704.
In step S704, a process of starting time measurement by the timer circuit in the microcomputer 51 is performed.
Proceed to. In S705, a process of notifying by voice or the like that the detected temperature of the temperature probe 57 has reached 200 ° C. is performed, and the process proceeds to S706.

In step S706, it is determined whether ten minutes have elapsed since the timer circuit was started in step S704, and if ten minutes have not elapsed yet, the process proceeds to step S706.
Then, in step S707, it is determined whether five minutes have elapsed from the time when the timer circuit started counting time. Still 5
If the minutes have not elapsed, the process proceeds to S709, and if five minutes have elapsed, the process proceeds to S708. In S708, T
A process for reading p and the temperature detected by the thermistor 3a (hereinafter, referred to as “Tt”) is performed, and the process proceeds to S709.

In S709, it is determined whether or not Tp has reached 200 ° C., and if it has been determined, the flow proceeds to S710, in which the power supply to the heating coil 47 is set to 0 W, and the flow returns to S706. On the other hand, if it is determined in step S709 that the temperature has not reached 200 ° C., the process advances to step S711 to determine whether Tp is equal to or lower than 198 ° C., which is 2 ° C. lower than the target temperature of 200 ° C. If it is determined that the temperature is 198 ° C. or lower, S7
Proceeding to 12, the power supply to the heating coil 47 is set to 1200 W,
If it is determined that the temperature is higher than 198 ° C., the process proceeds to S713, and the current supply to the heating coil 47 is kept at that time, and the process returns to S706. Here, “as it is at that time” in S713 means that 1200 W of electricity has been supplied to the heating coil 47 at that time.
If the power supply to the heating coil 47 is 0 W at that time, the power supply to the heating coil 47 is 0 W.

On the other hand, if it is determined in S706 that 10 minutes have elapsed since the start of the timer circuit counting in S704, the flow advances to S714, and the reading has been performed in S708 until that time, that is, 10 minutes from 5 minutes after the counting starts. S later
The average of Tp and Tt read at 708 is calculated, the average of Tt is subtracted from the average of Tp, and the result is stored in the memory 59 as a “learning value”, and the process proceeds to S715. S71
In S5, a process of notifying the end of the storage of the learning value by voice or the like is performed, and the process proceeds to S716. In S716, the heating is ended and the learning mode is ended.

In the learning mode described above, the temperature difference between the pot 5 and the oil in the pot 5 is measured and stored.

4. Operation in Review Mode Next, the operation of the electromagnetic cooker 1 in the review mode will be described based on the processing of the microcomputer 51. FIG.
6 is a flowchart of a subroutine of a review mode in S10 of FIG. In the review mode of the electromagnetic cooker 1, the temperature probe 57 is not inserted into the pot 5 as in the learning mode. Therefore, in the following description of the operation in the review mode, Tpg is the temperature probe 57
Is not the target temperature but the control temperature of the oil in the pot 5.

Referring to FIG. 8, first, in step S1001, the microcomputer 51 performs a process of receiving an input of the oil control temperature, that is, Tpg, from the user via the operation panel 2, and the process proceeds to S1002. In the electromagnetic cooker 1, by pressing the raise key 18 after the raise automatic key 24 is pressed, T corresponding to the number of times of pressing is increased.
pg can be entered. More specifically, the lift key 18 is pressed 5n + 1 times, 5n + 2 times, 5n + 3 times, 5n + 4
Times or 5n + 5 times (n is 0 or more), Tpg is set to “160 ° C.”, “170 ° C.”,
It can be input as “180 ° C.”, “190 ° C.” or “200 ° C.”.

In S1002, a process of setting the target temperature of the thermistor 3a (hereinafter referred to as "Ttg") to a temperature obtained by subtracting a learning value from Tpg input in S1001 is performed, and the flow advances to S1003. The learning value is a value stored in the memory 59 in S714 of the learning mode. In S1003, a process of starting heating of the pot 5 is performed by supplying 1200 W to the heating coil 47, and the process proceeds to S1004.

In S1004, it is determined whether or not Tt has reached the target temperature Ttg.
In step S1005, a process of notifying the user by voice or the like is performed, and the process advances to step S1006.

In S1006, as in S1004, T
It is determined whether or not t has reached Ttg.
If it is determined that the time has not reached Tt, the process proceeds to S1013 and Tt
It is determined whether or not the difference between Ttg and Ttg is 2 ° C. or more. 2 ℃
If so, the power supply to the heating coil 47 is decreased by 1 in S1014.
If the difference between Tt and Ttg is less than 2 ° C., the power supply to the heating coil 47 is kept at the current state in S1015, and the process proceeds to S1011. On the other hand, S100
At S6, when it is determined that Tt has reached Ttg, S10
At 10, the power supply to the heating coil 47 is set to 0 W, and S 101
Proceed to 1.

The electromagnetic cooker 1 is configured so that the user can change the Tpg by pressing the key 18 even during the cooking of the food. Then, in S1011, it is determined whether or not such a change in Tpg has been made, and if there is a change, the process returns to S1002,
A process for changing Ttg is performed based on the changed Tpg. If there is no change in Tpg, in S1012, the off key 2
It is determined whether or not 0 is pressed. If the off key 20 is not pressed, the process returns to S1006. If the off key 20 is pressed, the heating is terminated in S1016, and the review mode is terminated.

In the review mode described above, the pan 5
Is temperature controlled by Ttg. And Ttg is pot 5
It is set based on a learning value which is a difference between the temperature of the oil in the pan 5 and the oil in the pan 5. Therefore, in the review mode, the temperature of the pan 5 can be controlled by measuring the Tt without considering the temperature difference between the pan 5 and the oil in the pan 5 without inserting the temperature probe 57 into the pan 5. . That is, the electromagnetic cooker 1
Then, once the temperature probe 57 is inserted into the pot 5 in the learning mode and the learning value is stored, the oil temperature can be controlled without inserting the temperature probe 57 into the pot 5 in actual cooking. Become.

5. Modifications of the present embodiment (1) Embodiment of heating cooking device In the above-described embodiment, the electromagnetic cooking device 1 of the type installed on a table is shown as an example of the heating cooking device. It is not limited to this. If the cooking oil in the cooking pot is heated while controlling the temperature of the cooking oil in the cooking pot indirectly by estimating the temperature of the cooking oil in the cooking pot by measuring the temperature of the cooking pot to be heated, for example, a portable type May be used.

Further, the present invention relates to a heating apparatus for using an object other than edible oil in a container whose temperature is controlled, and a heating apparatus for cooking using an oil other than edible oil in a container whose temperature is controlled. The present invention can also be applied to temperature control of objects in the container. In addition to the above-mentioned edible oil, as the thing in the container to be temperature-controlled, for example, water, silicon oil used for chemical experiments and the like can be considered.

(2) Configuration of Memory 59 In the present embodiment described above, the memory 59 can be configured so that its stored contents can be updated. Thereby, even when the material of the pot used for the electromagnetic cooker 1 is changed, if the learning value is stored again in the learning mode, the appropriate oil temperature control can be performed using the pot. Can do it.

In this embodiment, the operation panel 2 is provided with only one setting key 22, but the present invention is not limited to this. That is, the operation panel 2 is provided with a plurality of keys corresponding to the setting keys 22, and the memory 59 is configured to store a plurality of learning values for pots made of different materials corresponding to the respective keys. You can also. Accordingly, even when the temperature difference between the oil in the cooking pot and the oil in the cooking pot changes, such as when the material of the cooking pot used in the heating cooking device changes, cooking can be performed without storing the learning value each time. Can be.

(3) Control based on fluctuation of measured value of Tt when oil is small The measured value of Tt during cooking is not constant but has fluctuation within a certain range. This fluctuation causes fluctuation in the temperature of the oil in the pot 5. The fluctuation of the oil temperature will be described below.

First, FIG. 9A shows a change in oil temperature in the pan 5 and a change in ON / OFF of energization of the heating coil 47 in the electromagnetic cooker 1 with the elapse of time. FIG.
Referring to (a), the power supply to the heating coil 47 is maintained in the ON state until the oil temperature reaches the target temperature (Tpg). Then, once the oil temperature reaches the target temperature (Tpg), the power supply to the heating coil 47 is temporarily turned off. At this time, even if the power supply to the heating coil 47 is turned off, the temperature of the oil rises for a while and then falls due to the rise in the temperature of the pot 5 due to the residual heat of the top plate 3. When the oil temperature falls below the target temperature (Tpg) again, the heating coil 4
7 is turned on. In this case, the heating coil 47
Even if the power is turned on, the temperature of the pot 5 does not rise immediately but drops for a while and then rises, so that the temperature of the oil also rises after a while. For this reason, the temperature of the oil is maintained near Tpg with fluctuation within a certain range. It should be noted that the width of the fluctuation in the temperature of the oil increases as the amount of the oil decreases.

FIG. 9B is an enlarged graph showing the time change of the oil temperature after the temperature reaches the target temperature (Tpg) in FIG. 9A. In FIG. 9B, two curves, a solid line and a broken line, are described, but the solid line indicates the oil temperature (oil temperature A) when the oil in the pan 5 is an appropriate amount, and the broken line indicates Shows the oil temperature (oil temperature B) when the amount of oil in the pot is small. 9B, comparing the oil temperature A with the oil temperature B, when the amount of the oil is small, such as the oil temperature B, even if the average temperature is the same as the appropriate amount indicated by the oil temperature A, It can be seen that the run-out was large and the maximum temperature reached was high. Thereby, depending on the set target temperature (Tpg), if the amount of oil in the pan 5 is an appropriate amount, the oil emits smoke (temperature at which smoke is emitted).
, But in small quantities the oil may reach its fuming temperature. Therefore, when the amount of oil is small, it is necessary to set the control temperature of the pan 5 lower than the case where the amount is appropriate for the same target temperature (Tpg). In the electromagnetic cooker 1, whether or not the amount of oil is small can be determined based on whether or not the amount of change of Tt within a unit time is equal to or greater than a predetermined reference amount.

Therefore, in the electromagnetic cooker 1, T
When measuring t, if the change amount of Tt within a unit time is equal to or more than the reference amount, Tpg input by the user
Irrespective of the value of, it can be configured to uniformly set Ttg to a predetermined temperature lower than Tpg determined from Tpg. The reference amount is, for example, 0.53 ° C./s
ec, the predetermined temperature is, for example, 168 ° C.

Here, when the microcomputer 51 performs the above processing, if the change amount of the temperature of the cooking pot in a unit time is equal to or more than the reference amount by the microcomputer 51, the temperature control means A control temperature priority determining means for determining the control temperature of the cooking pot to be a predetermined temperature lower than the control temperature determined by the control temperature determining means with higher priority than the control temperature determining means is configured.

(4) Pot Temperature Control Method In the above-described embodiment, the microcomputer 51 controls the temperature of the pot 5 by energizing the heating coil 47 based on the measured value of Tt at that time. However, the present invention is not limited to this. The microcomputer 51 may be configured so that the temperature control of the pot 5 is performed by P control (proportional control) or PI control (control in which proportional and integral are combined). In this case, as the learning value, not only one point data of the difference between Tp and Tt but also data of a delay time of heat transfer from Tp to Tt is required.

6. Conclusion In the present embodiment described above, the microcomputer 51 that performs each process in the learning mode constitutes a temperature difference calculation unit that calculates the temperature difference between the measurement temperatures of the pot temperature measurement unit and the oil temperature measurement unit. . The memory 59 for storing the learning value constitutes a temperature difference storage unit for storing the temperature difference calculated by the temperature difference calculation unit.

The thermistor 3a, the microcomputer 51 for performing each process in the review mode, and the heating coil 47 constitute a temperature control means for controlling the temperature of the cooking pot. In particular, the microcomputer 51 that performs the processing of S1002 constitutes a control temperature determining unit that determines the control temperature of the cooking pot by the temperature control unit based on the temperature difference stored in the temperature difference storage unit.

The operation panel 2 constitutes a temperature input section for inputting a set temperature for the cooking oil in the cooking pot. In the present embodiment, the set temperature is the oil control temperature input by the user.

[Brief description of the drawings]

FIG. 1 is a diagram showing the appearance of an electromagnetic cooker as an example of a heating cooking device.

FIG. 2 is a diagram showing a state where the electromagnetic cooker of FIG. 1 is installed on a table.

FIG. 3 is a diagram showing a configuration of an operation panel of the electromagnetic cooker of FIG. 1;

FIG. 4 is a diagram schematically showing an electric circuit of the electromagnetic cooker of FIG. 1;

FIG. 5 is a flowchart of a main routine of a microcomputer of the electromagnetic cooker of FIG. 1;

FIG. 6 is a plot of the temperature difference between the oil in the pot and the pot with respect to the measured temperature of the pot in the electromagnetic cooker of FIG. 1;

FIG. 7 is a flowchart of a subroutine of a learning mode in FIG. 5;

FIG. 8 is a flowchart of a subroutine of a review mode in FIG. 5;

FIG. 9 is a diagram for explaining a change in oil temperature in the pot with respect to time when the pot is heated by the electromagnetic cooker of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 electromagnetic cooker 2 operation panel 3 top plate 3a thermistor 5 pan 51 microcomputer 52, 58 temperature detection circuit 57 temperature probe 59 memory

Claims (1)

(57) [Claims] 1. Pot temperature measuring means for measuring the temperature of a cooking pot fixed in a cooking device, and oil temperature measuring means detachable from the heating cooking device and measuring the temperature of cooking oil in the cooking pot. When the temperature difference calculating means for calculating the temperature difference between the measured temperature and the oil temperature measuring means and said pan temperature measuring means prior to the actual cooking, the temperature for storing the temperature difference calculated by said temperature difference calculation means Setting based on the difference storage means and the temperature difference stored in the temperature difference storage means.
Control for determining a control temperature of the cooking pot corresponding to a constant temperature
Temperature determining means, the control temperature and the pan temperature determined by the control temperature determining means
Execute actual cooking based on the measured temperature of the measuring means
A heating cooking device, comprising: a temperature control unit .