JP4106803B2 - Cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooking device that uses oil, and more particularly, to a device that determines whether the amount of oil is an appropriate amount or an extremely small amount, and selects a temperature threshold corresponding to the amount to control heating.
[0002]
[Prior art]
Conventionally, examples of this type of cooking device include those disclosed in JP-A-8-270957 and JP-A-58-160738.
[0003]
FIG. 10 is a block diagram of the main part of a heating cooker described in Japanese Patent Laid-Open No. 8-270975. In the figure, the temperature of the heat-resistant glass 3 is detected to control the heating means 1 such as a heating coil of an electric heater or an electromagnetic cooker, the heating container 2 heated by the heating means 1, and the temperature of oil in the heating container 2. And a control means 5 for controlling the amount of heat of the heating means 1 by the output of the temperature detection means 4. The control unit 5 at the time of heating, and control the temperature detecting means 4 is powered down or OFF the output of the heating unit 1 and detects the above temperature threshold T _A shown in FIG. 11, the temperature detecting means 4 is the temperature at the time of normal heating it is obtained by heating control so as not to reach a high temperature threshold T _B than threshold T _a. Then, any chance, in which the temperature sensing means 4 automatically stops the heating means 1 and detects a temperature higher than the temperature threshold value T _B than temperature threshold T _A.
[0004]
FIG. 12 is a block diagram of the main part of the cooking device described in Japanese Patent Laid-Open No. 58-160738. In the figure, a heating means 1 such as a gas burner, a heating container 2 heated by the heating means 1, and a temperature detection means 4 for detecting the temperature of the heating container 2 to control the temperature of oil in the heating container 2 are provided. The control means 5 is operated by the output of the temperature detection means 4, and the control means 5 includes a calculation unit 8 for discriminating the pan type 6 and the cooking amount 7, and a correction unit for correcting the difference from the standard value (oil temperature). 9. And discrimination | determination of the pan kind 6 detects the temperature of the temperature sensor as the temperature detection means 4 60 seconds after a heating start in FIG. 13, and calculates a temperature difference (Tb-Ta) with the microcomputer as the control means 5. FIG. . Then, the difference between the temperature difference and the standard value (oil temperature) is calculated, and the temperature is corrected according to the magnitude of the temperature difference. Further, the amount of cooking 7 is slightly discriminated after the heating has elapsed, the temperature of the temperature sensor 4 for 20 seconds is detected again, and the microcomputer 5 calculates the temperature difference (Td−Tc). In the same manner as described above, the difference between the temperature difference and the standard value (oil temperature) is calculated, and optimal heating control is performed by correcting the temperature according to the magnitude of the temperature difference.
[0005]
[Problems to be solved by the invention]
However, the former conventional heating cooker heating control properly heated continue output of the heating unit 1 at a temperature of less than the threshold value T _B from the above temperature threshold T _A of that shown in FIGS. 10 to 13 However, if the amount of oil is extremely small when heating the oil, the oil temperature rapidly rises, so it is necessary to determine the amount of oil in a short time from the start of heating and control the heating according to the amount of oil. This heating control cannot cope and is unwell.
[0006]
Moreover, the latter cooking device of the conventional example is a case where the cooking amount is somewhat discriminated, and is the case of the heating cooking performance in which discrimination control is performed with one piece of temperature information. On the other hand, in the case of safe heating control, the determination of the oil amount must be absolute. For this purpose, it is necessary to perform reliable discrimination control including variations and margins of the temperature detection means 4 and the configuration. The discrimination control based on one temperature information is not absolute and is inferior.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention calculates the level after the start of heating and the level difference by the microcomputer of the control means when automatically adjusting the temperature of the oil and controlling the heating safely, and correlates the two types of information. Thus, the certainty of oil amount determination is increased and the temperature threshold value corresponding to the oil amount is selectively controlled.
[0008]
According to the above invention, it is possible to automatically adjust the temperature even in an appropriate amount and a very small amount at the time of oil heating control, and it is possible to ensure ease of use and economical oil heating and to ensure safety.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention detects and controls the temperature from the temperature detecting means X minutes, Y minutes and Z minutes after the start of heating, when determining the appropriate or extremely small amount of oil when automatically controlling the temperature of the oil and controlling the heating safely. The temperature level after X minutes and the temperature level difference after Z minutes and Y minutes are calculated by means, and the temperature level after X minutes is greater than or equal to a predetermined threshold value L, and after Z minutes and Y When the threshold value of the temperature level difference after the minute is equal to or greater than a predetermined threshold value M, it is determined that the amount of minimal hot water is selected, and the temperature threshold values T6 and T7 are selected. The temperature threshold values T1 and T2 (T1> T6, T2> T7) are selected by discrimination, and the temperature level after X minutes is less than the threshold value L, and the temperature levels after Z minutes and Y minutes. When the difference threshold value is equal to or greater than the threshold value N (M> N), it is determined that there is a minimum amount of hot water and the temperature threshold value T6, If T7 is selected and the temperature is less than the threshold value N, it is determined that the amount of hot water is an appropriate amount, temperature threshold values T1 and T2 are selected, and heating is performed based on the temperature threshold values T1 and T2 or threshold values T6 and T7. It controls on / off of the means .
[0010]
And since oil heating can be continued even when the amount of oil is extremely small, tempura oil can be heated while saving the amount of oil, which is economical and convenient, and can be prevented from overheating and is safe.
[0011]
Further, if the output of the heating means from the start of heating to Z minutes later is A, and the output of the heating means at an appropriate amount after oil amount discrimination control and the output of the heating means at the very small amount are B and C, B> C and B> A Accordingly, the output of the heating means is controlled, and heating control with automatic temperature control is performed even when heating an appropriate amount and a very small amount.
[0012]
In contrast to automatic temperature control when the oil amount is appropriate, even when the amount of oil is very small, automatic temperature control can be performed with performance close to automatic temperature control at the appropriate amount, which is easy to use and prevents overheating. It is safe.
[0013]
【Example】
An embodiment of the present invention will be described below with reference to FIGS.
[0014]
(Example 1)
FIG. 1 is a block diagram of the heating control of the heating cooker of the present invention, FIG. 2 is a conceptual diagram showing the heating control, FIG. 3 is a sectional view of the main part, FIG. 4 is an external view, and FIG. FIG. 6 is a characteristic diagram for explaining how to control heating, and FIG. 7 is a cross-sectional view of a main part of a heating cooker according to another embodiment.
[0015]
In FIG. 3, the heating cooker includes a heat-resistant glass 11 that transmits infrared rays on which the heating container 10 is placed, and a stove portion 14 that is formed of a heat insulating material 13 that houses an infrared heater as a heating means 12 in the lower portion thereof and has an upper surface opened. And a temperature sensor as temperature detecting means 15. The upper surface 16 of the temperature sensor 15 is in contact with the heat resistant glass 11. An opening 17 is provided at the center of the heat insulating material 13 of the stove 14, and the temperature sensor 15 is positioned in the opening 17. The opening 17 and the heat-resistant glass are used so that the radiant heat from the infrared heater 12 is appropriate. 11 is provided with a heat insulating material as the heat suppression body 18. Reference numeral 19 denotes a control means.
[0016]
4, the operation unit 20 includes an energization start key 21, an energization stop key 22, a heating start key 23, a heating stop key 24, a temperature setting key 25, and the like. Then, as an operation, the energization start key 21 is pressed, the tempura oil temperature is set by the temperature setting key 25 by input (usually from 140 ° C. to 200 ° C.), and the energization is started by pressing the heating start key 23. The infrared heater as the heating means 12 generates heat, passes through the heat-resistant glass 11 directly above, and heats the heating container 10 such as a tempura pan by conduction heat and radiation heat.
[0017]
Based on FIG. 5, the performance by heating control when the amount of oil is an appropriate amount and when it is extremely small (for example, 200 ml) will be described.
[0018]
(1) When the oil amount is an appropriate amount, the temperature of the temperature sensor 15 is equal to or higher than the temperature threshold value T2 with respect to the temperature threshold values T1 and T2 corresponding to the oil temperature set by the input to the control means 19 Is detected, a signal is sent to the control means 19 to reduce or turn off the output of the infrared heater 12. Thereafter, when the temperature sensor 15 detects a temperature equal to or lower than the temperature threshold value T1, the output of the infrared heater 12 is returned to full power or turned on. Thus, the temperature is automatically adjusted so that the oil temperature set by the input can be maintained. Generally, the appropriate amount is that the amount of oil in the heating container 10 is 800 ml to 1100 ml, and is specified in the instruction manual for the product.
[0019]
(2) When the amount of oil is extremely small, if heating is started at full power without controlling the output of the heating means 8 after the start of heating, the oil temperature rises rapidly and the temperature detected by the temperature sensor 15 becomes the temperature threshold. Even if the control means 19 decreases or turns off the output of the infrared heater 12 when the value T2 is exceeded, the temperature of the temperature sensor 15 may far exceed the temperature threshold value T2. At this time, the oil temperature becomes high, and in some cases near 300 ° C., evaporating oily smoke is generated, which is not good. That is, when the amount of oil is extremely small, the temperature difference between the oil temperature and the temperature sensor becomes large, and the temperature control of the oil temperature is not accurate.
[0020]
For these reasons, not only when the amount is appropriate, but also when the amount is extremely small (for example, 200 ml), the amount of oil is appropriate or extremely small in order to enable automatic temperature control and oil heating to be continued in almost the same manner as when the amount is appropriate. Heating control corresponding to is required. In particular, highly accurate discrimination control is required after the start of heating.
[0021]
In the present invention, after the start of heating, the oil amount is discriminated based on two kinds of temperature information of temperature and temperature difference, and the temperature threshold corresponding to the appropriate amount and the extremely small amount is selected to control the heating. As shown in FIG. 2, the temperature sensor 15 detects temperatures T3, T4, and T5 after X minutes, Y minutes, and Z minutes after the start of heating. At this time, the level of the control means 19 in the hexadecimal system of the microcomputer is calculated, and the level after X minutes and the level difference after Z minutes and Y minutes are calculated. As shown in FIG. 1, when the level of the microcomputer of the control means 19 X minutes after the start of heating is equal to or higher than a predetermined threshold L, Z minutes and Y minutes (Z-Y) If the level difference is greater than or equal to the predetermined threshold value M, the oil amount is determined to be extremely small, and the temperature threshold values T6 and T7 corresponding to the extremely small amount are selected, and if less than M, the oil amount is determined to be an appropriate amount. The temperature threshold values T1 and T2 corresponding to are selected. Further, when the microcomputer level after X minutes after the start of heating is less than L, the oil amount is greater if the level difference between Z minutes and Y minutes (Z-Y) is greater than or equal to a predetermined threshold value N. The temperature threshold values T6 and T7 corresponding to the extremely small amount are selected and determined to be extremely small, and if it is less than N, the oil amount is determined to be an appropriate amount and the temperature threshold values T1 and T2 corresponding to the appropriate amount are selected.
[0022]
Note that when the level of the microcomputer of the control means 19 is L or higher, it will be described as one example of this type of indirect detection type temperature sensor 15 of the present invention. When the amount is extremely small, the level is L or higher, and this discrimination control is sufficient. However, in consideration of variations in the temperature sensor 15 and the configuration, it is necessary to predict that the level X minutes after the start of heating will be L or less both when the amount is appropriate and when the amount is extremely small. Therefore, when the level of the microcomputer is L or more, the difference in level between Z minutes and Y minutes (Z-Y) is also set to a large M value. At the time, the level difference between Z minutes and Y minutes (Z−Y) is set to an N value (a value smaller than the M value), and the discrimination control is performed above and below the N value. Thereby, even if the variation of the temperature sensor 15 and a structure arises, it enables it to perform discrimination | determination control exactly.
[0023]
That is, the level difference is M> N, and temperature threshold values T1, T2> temperature threshold values T6, T7. That is, the former level and the latter level difference are related to select the temperature threshold value and control the heating. As a result, overshoot occurs even when the amount of oil is extremely small as shown in FIG. 6, and the temperature is automatically adjusted so that the set oil temperature can be maintained, although the performance is not as good as when the amount is appropriate. Heating can be continued.
[0024]
Further, the calculation of the level of the microcomputer of the control means 19 by the hexadecimal system means that the voltage of the detection circuit (not shown) is detected by the change of the resistance value of the temperature sensor 15 and the level is calculated by the microcomputer of the control means 19. Is. This is a very general method because the temperature can be determined by obtaining the level.
[0025]
As described above, according to this embodiment, automatic temperature control can be performed with the performance close to the automatic temperature control at the proper amount even when the oil amount is very small, compared to the automatic temperature control when the oil amount is an appropriate amount. It is easy to use and secures safety. Furthermore, since oil heating can be continued even when the amount of oil is extremely small, it is economical and convenient for the user to heat the tempura oil while saving the amount of oil.
[0026]
Note that the extremely small amount (for example, 200 ml) is described in the preventive office examination / inspection standards supervised by the Tokyo Fire Department. As a specific cooking oil overheat prevention device, cooking oil is 200 ml or more and the oil temperature is 300 ° C. There is the following standard, which means the amount of oil at this time. However, in this embodiment, by appropriately selecting a predetermined microcomputer level as a threshold value, control can be performed even when the amount is 200 ml or less.
[0027]
Next, the cooking device described in the present embodiment is provided with an infrared heater 12 and a temperature sensor 15 below a heat-resistant glass 11 that transmits infrared rays. The infrared heater 12 has a high temperature of about 800 ° C., and in order to form the temperature sensor 15 in the vicinity of the infrared heater 12, the peripheral structure of the temperature sensor 15 that appropriately transmits the radiant heat from the infrared heater 12 is important. This is described below.
[0028]
When the heat insulation of the radiant heat from the infrared heater 12 is insufficient, the radiant heat is transmitted to the temperature sensor 15 so that the temperature sensor 15 detects a temperature higher than the oil temperature. The oil temperature in the heating container 10 is low-temperature. That is, the difference between the gradient of the temperature change of the oil temperature and the gradient of the temperature change of the temperature sensor 15 becomes large, and the true gradient of the temperature change cannot be detected. On the other hand, if the heat insulation of the radiant heat is too good, the heat-resistant glass 11 in the portion where the temperature sensor 15 is located is not heated by the infrared heater 12, and further, the heat conduction to the heat-resistant glass 11 from the high-temperature part is small. Moreover, since the temperature sensor 15 detects a temperature that seems to be cooler than the oil temperature, the oil temperature in the heating container 10 becomes hotter than the set temperature. That is, the difference between the gradient of the temperature change of the oil temperature and the gradient of the temperature change of the temperature sensor 15 becomes large, and the true gradient of the temperature change cannot be detected. For this purpose, the radiant heat from the infrared heater 12 is appropriately biased and applied to the temperature sensor 15, and the temperature change gradient of the oil temperature in the heating container 10 and the temperature change gradient of the temperature sensor 15 are approximated to change the temperature. The accuracy of control is increased.
[0029]
Next, another embodiment will be described.
[0030]
In FIG. 7, the electromagnetic cooker 26 includes a heating coil as a heating means 28 and a temperature detection means 29 below a heat-resistant glass 27 on which the heating container 10 is placed. At this time, although the temperature detection means 29 is provided in the vicinity of the heating coil 28 of the electromagnetic cooker 26, the temperature detection means 29 can easily detect since there is no influence of the radiant heat as the above-described infrared heater 12. Reference numeral 30 denotes a control means, and the heating control is the same as in the first embodiment.
[0031]
In addition, according to the present Example, it was possible to control the heating with little influence from the pan type.
[0032]
(Example 2)
FIG. 8 is a conceptual diagram of the heating control of the heating cooker of the present embodiment, and FIG. 9 is a characteristic diagram for explaining how to control the heating.
[0033]
In Example 1, the temperature of the temperature sensor 15 is detected after X minutes, Y minutes, and Z minutes after the start of heating, and the oil amount is discriminated based on two types of temperature information of temperature and temperature difference. In this embodiment, high-precision performance is obtained by controlling the output of the infrared heater 12. The configuration is the same as in the first embodiment.
[0034]
As for the heating control, as shown in FIG. 8, the output of the infrared heater 12 from the start of heating until Z minutes is A, and after the oil amount discrimination control, the output of the heating means at an appropriate amount is B, and when the amount is extremely small If the output of the heating means is C, the output of the infrared heater 12 is controlled in the relationship of B> C and B> A.
[0035]
As a result, as shown in FIG. 9, even when the amount of oil is extremely small, the overshoot is reduced, so that the temperature threshold value may be only T1 and T2 from an appropriate amount of oil to a very small amount of oil. However, in order to obtain performance with higher accuracy, the temperature thresholds T1, T2, T6, and T7 corresponding to appropriate and extremely small amounts of oil are provided as in the first embodiment, and heating control can be performed by selecting. It is possible. Then, in an appropriate amount of oil to an extremely small amount of oil, the temperature is automatically adjusted so as to maintain the temperature set by the input as much as possible, thereby enabling highly safe oil heating.
[0036]
As described above, according to this embodiment, automatic temperature control can be performed with the performance close to the automatic temperature control at the proper amount even when the oil amount is very small, compared to the automatic temperature control when the oil amount is an appropriate amount. Easy to use, safe from overheating.
[0037]
In addition, although the case where the temperature sensor was used as a temperature detection means was demonstrated, this can be used as a temperature detection means if it is a small-sized and quick response like a thermistor and a highly reliable temperature sensor. Means.
[0038]
Further, although the case where an infrared heater is used as the heating means has been described, a heater having a large amount of infrared radiation such as a halogen heater, a carbon heater, or a nichrome heater is suitable as the heating means.
[0039]
【The invention's effect】
As described above, according to the heating cooker of the present invention, the following effects can be obtained.
[0040]
The cooking device of the present invention automatically adjusts the temperature of the oil and controls the temperature from the temperature detection means X minutes, Y minutes, and Z minutes after the start of heating when discriminating an appropriate or extremely small amount of oil when controlling the heating safely. Detect and calculate the level after X minutes and the level difference after Z minutes and Y minutes with the microcomputer of the control means, and select the temperature threshold based on the correlation between the former level and the latter level difference, and control the heating To do.
[0041]
Thereby, even if the amount of oil is extremely small, the oil heating can be continued, so that the tempura oil can be heated while saving the amount of oil, which is economical, convenient, and safe from overheating.
[0042]
Further, if the output of the heating means from the start of heating to Z minutes later is A, and the output of the heating means at an appropriate amount after oil amount discrimination control and the output of the heating means at the very small amount are B and C, B> C and B> A Thus, the output of the heating means is controlled, and heating control with automatic temperature control is performed even when heating an appropriate amount and a very small amount.
[0043]
As a result, automatic temperature adjustment with the performance close to automatic temperature adjustment at the proper amount can be performed even when the amount of oil is very small, and it is easy to use and can prevent overheating. It is safe.
[Brief description of the drawings]
FIG. 1 is a block diagram of heating control of the heating cooker according to the first embodiment of the present invention. FIG. 2 is a conceptual diagram showing heating control of the heating cooker. 4] External view of the cooking device [Fig. 5] Characteristic diagram for explaining how to control heating of the cooking device [Fig. 6] Characteristic diagram for explaining how heating control of the cooking device [ 7 is a cross-sectional view of a main part of a heating cooker according to another embodiment. FIG. 8 is a conceptual diagram of heating control according to a second embodiment of the present invention. FIG. 9 is a diagram for explaining a heating control method of the heating cooker. Fig. 10 is a cross-sectional view of a conventional cooking device. Fig. 11 is a characteristic diagram for explaining how to control heating of the cooking device. Fig. 12 is a cross-sectional view of another conventional cooking device. FIG. 13 is a characteristic diagram for explaining the heating control method of the heating cooker.
12 Infrared heater (heating means)
15 Temperature sensor (temperature detection means)
19 Control means

Claims (2)

When automatically controlling the temperature of the oil and controlling the heating safely, the temperature from the temperature detection means is detected after X minutes, Y minutes and Z minutes after the start of heating. and the temperature level of X minutes after, calculates a temperature level difference between Z min and after Y minutes after, the Z component and after Y minutes after the temperature level after X minutes is not more predetermined threshold value L or more When the threshold value of the temperature level difference is equal to or greater than a predetermined threshold value M, it is determined that the amount is very small, and the temperature threshold values T6 and T7 are selected. The temperature thresholds T1 and T2 (T1> T6, T2> T7) are selected, and the temperature level after X minutes is less than the threshold value L, and the difference between the temperature levels after Z minutes and Y minutes. If the threshold value is greater than or equal to the threshold value N (M> N), it is determined that the amount of hot water is minimal, and temperature threshold values T6 and T7 are selected. If it is less than the threshold value N, it is determined that the amount of hot water is an appropriate amount, and the temperature threshold values T1, T2 are selected, and the heating means of the heating means is selected based on the temperature threshold values T1, T2 or threshold values T6, T7. A cooking device that controls on / off . If the output of the heating means from the start of heating to Z minutes after is A, and the output of the heating means at the appropriate amount after oil quantity discrimination control and the output of the heating means at the very small amount are B and C, the relationship of B> C and B> A The cooking device according to claim 1, wherein the heating means controls the output of the heating means to control heating from an appropriate amount to an extremely small amount.

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