JPS58178123A - Temperature controller for cooking - Google Patents

Abstract

PURPOSE:To perform the correction of set temperature corresponding to the type of a pan, by discriminating the type of the pan from the slope value of a rise in temperature. CONSTITUTION:A detecting part for the type of a pan discriminates the type of the pan from the slope W1 of a rise in temperature of a sensor for a specified time right after heating starts. A pan having a very high heat capacity is hard to heat as the result of heating, and the slope W1 is smaller than that of a general pan. Thus, if the slope W1 is smaller than a predetermined value K, it can be set to a temperature C in which a correcting temperature TW1 is determined in terms of a particular pan. Further, a pan having a low heat capacity and a thin thickness is generally larger in the slope W1 than tha of a conventional pan. Thus, if the slope W1 is larger than a predetermined value L, the pan can be set to a temperature C' in which the correcting temperature TW1 is determined in terms of the other particular pan.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking temperature control device that attempts to accurately obtain a cooking temperature when cooking using a heating cooker such as a gas stove.

There is an optimal cooking temperature for any food, and it is difficult to set the optimal temperature when actually cooking.
o For example, when making tempura, it is difficult to control the temperature of the oil.
If it was too high or too low, it would not be delicious. In addition, the oil ages quickly and is wasted. Therefore, a method was devised to control the temperature by detecting the temperature of the contents. (-) It is inconvenient to insert a temperature sensor into a cooking pot to detect the temperature of the contents, and it also feels unclean. A method of detecting the temperature of the pot and inferring the temperature of the contents was devised. However, this method had the disadvantage that the temperature at the bottom of the pot and the temperature of the contents were not constant and varied depending on the material thickness, shape, etc. of the pot. .

The present invention is an 8-degree cooking peripheral temperature control device that detects the temperature of the bottom of a pot, and is intended to obtain a temperature suitable for cooking by correcting a preset temperature according to the type of pot.

For this reason, the configuration is such that the slope value of the temperature rise at the bottom of the pot during a certain period of time immediately after ignition is detected, and the corrected temperature is calculated using that value as a function.

The present invention will be explained below according to the drawings. FIG. 1 is a diagram showing an example of a control system to which the present invention is applied, and in this example, the control system is shown as being applied to a gas staple stove. Reference numeral 1 denotes a gas inlet, and the gas passes through heating control means 2 consisting of a proportional control valve and a solenoid valve, and is burned in a burner 3. The burner 3 heats the bottom of the pot 4 and adds heat to the cooked food 6. 6 is pot 4
7 is a temperature detection part that detects the temperature of temperature sensor 6, 8 is a temperature setting part that can be set arbitrarily, 9 is attached to temperature detection part 7, and 7 is a temperature detection part that detects the temperature of temperature sensor 6. 1o is a temperature correction unit that corrects the set temperature of the temperature setting unit 8 which is preset according to the type of pot by the steel type detection unit 9; 11 is a comparison unit that detects the temperature of the temperature detection unit 7 and the temperature The temperature corrected by the correction unit 10 is compared, and the heat amount control unit 12 appropriately drives each of the proportional valve that proportionally increases or decreases the gas amount in the heating control means 2 and the solenoid valve that opens and closes the gas. Controls the combustion amount of burner 3.

Note that the proportional valve and the solenoid valve of the heating control means 2 may be provided separately, or the proportional valve may also serve as the solenoid valve.

Therefore, even if the type of pot changes, the temperature of the food to be cooked 6 is corrected so as to be the temperature set by the temperature setting section 8.

Here, in the case of a conventional control method, the signal from the sensor 6 is directly introduced into the heat quantity control section 12 as shown in FIG. 10, thereby outputting a drive signal for the heating control means 2. When the signal from the sensor 6 is lower than the set temperature of the heat amount control section 12, the proportional valve of the heat amount control section 12 is fully opened and the burner 3 is at maximum combustion. As the temperature of the sensor 6 rises and approaches the set temperature, the proportional valve gradually begins to throttle down and the combustion amount is also gradually throttled down. When the temperature of the sensor 6 exceeds the set temperature, the proportional valve is fully closed and combustion of the burner 3 is stopped. In this case, sensor 6
There is no problem as long as the correlation between the temperature of the food 6 and the temperature of the food 6 is constant. However, since the type of pot is not constant and varies each time cooking is performed, it is difficult to correlate the temperature of the sensor 6 and the food 6. For example, when performing tempura, the same setting is made in the heat amount control unit 12 when the thickness of the pot is large or made of a material with poor heat conduction, and when the thickness of the pot is small or made of a material with good heat conduction. In terms of temperature, the oil temperature is lower in the former and higher in the latter, and the difference in temperature is large, which poses a practical problem.

FIG. 2 shows temperature rise characteristics, and shows the detection method of the steel type detection section 9 and the sampling method of the temperature signal of the temperature detection section 7 taken into the comparison section 11, where the horizontal axis X indicates time and MIllllTt- indicates temperature. The figure shows an example of the characteristics when frying tempura, where M indicates the temperature of the contents, that is, the oil temperature, and B indicates the temperature detected by the temperature sensor 6 at the bottom of the pan. The temperature Ta of the oil temperature, the temperature of the sensor salt, and the temperature B of the sensor salt gradually rise as a result of heating. Here, the steel type detection unit 9 detects the temperature increase slope (W+
-Tb -Ta) to distinguish 40 types of pots. Here, a pot with a large temperature difference between sensor salt B and oil temperature A (generally, the pot is thick or made of a material with poor heat conduction).
The larger the slope W1 is, the larger the slope W1 becomes. Also, the smaller the temperature difference, the
This slope W1 is small. Therefore, a correlation equation is established between the temperature difference and the slope W1, and the temperature can be corrected Tw1 depending on the steel type.

However, as an exception to the above, a pot 4 having an extremely large heat capacity, such as a cast iron pot (for example, made of Nanbu Iron), is difficult to warm up when heated, and the slope W1 is smaller than that of a general pot. Therefore, if the slope W1 is smaller than a predetermined value, the corrected temperature 'rw1 can be set to the predetermined temperature C as a special pot. Furthermore, in the case of a thick pot with a small heat capacity (for example, a pot made of aluminum casting with a thickness of 6% or more), the slope W1 is larger than that of a general pot.

Therefore, if the slope W1 is larger than a predetermined value, the corrected temperature TW+ can be set to the predetermined temperature C' as the other special pot. For the corrected temperatures c and c', the temperature difference between the sensor salt B and the oil temperature Mu, as described above, is used as a special preparation on both sides.

A correction temperature TNv1 is determined by the slope W1 of the steel type detection section 9, and the value of the sensor temperature is set so that the oil temperature is equal to the set temperature T1 set in the temperature setting section 8. To = 'r+ +T'
It can be determined by W+. The comparator 11 calculates the corrected temperature TO
In order to compare this with the temperature signal from the temperature detection section 7, the temperature Tc-n-Tc is sequentially measured at each sampling time ΔX and compared with the corrected temperature TO. Sensor salt B is TO
When this happens, the oil temperature A in the pot 4 has reached the preset temperature T1. Now, if the sensor salt becomes Tc at time Xc and exceeds TO, the heat amount control unit 12 controls the heating control means 2
The proportional valve and the solenoid valve thereafter operate to maintain TO within a certain temperature range ΔT.

FIG. 3 shows the control characteristics after reaching the temperature TO, the horizontal axis X is time, the vertical axis T of the characteristics Y is temperature, the broken line M is the temperature of the food 5 as in FIG. 2, and the solid line B is the sensor. 6 temperature is shown.

The vertical axis of characteristic 2 is an example in which the proportional valve of the heating control means 2 also serves as a solenoid valve, and shows a proportional valve current Ii, which is proportional to the combustion amount of the burner 3. Until time Xc, before the signals from the comparison units 1, 1 shown in FIG. 2 become Tc≧To, the proportional valve current is at its maximum, and the combustion amount of the burner 3 is also at its maximum combustion. At time Xc, the sensor salt becomes Tc, and the temperature of the food 6 becomes the set temperature T1, and the proportional valve current is throttled or closed.
The amount of combustion is reduced or stopped to maintain TO at a temperature of ΔT. Here, the temperature TO and the sensor salt B are corrected from the set temperature T1.
The proportional valve current, or combustion amount, is controlled according to the difference between the two. Now, if the cooked food 6 is added at time Xd, the cooked food temperature will decrease. Along with this, the sensor salt B also decreases, detecting a decrease in the temperature of the food to be cooked, and the heat amount control section 12 increases the proportional valve current to Id in accordance with the difference between this temperature Td and the corrected temperature TO.

As a result, the combustion amount also increases and the temperature B returns to the original temperature TO, similarly maintaining the temperature T1. It changes depending on the size of Id, and when To −Td is large, Id is large;
When To −Td is small, Id becomes small.

When creating a complex control system like the one described above, microcomputers (hereinafter referred to as microcomputers) are often used these days. This is shown in a simple flow diagram when created using .

In the figure, IG is the subroutine of the ignition sequence of burner 3,
S indicates a subroutine for reading the temperature Bi of the sensor 6. SS indicates a subroutine for outputting an electric current for increasing/decreasing or closing the throttle amount of the proportional valve of the heating control means 2 in accordance with the magnitude of the temperature To -Td.

I is the correction temperature TW according to the steel type from the temperature increase slope W1 between the sensor salt Ta after ignition and Tb after 1 minute in the steel type detection part.
1, or if the slope W1 is less than or equal to a predetermined value in a special pot, or is greater than or equal to 5, the corrected temperature TW+ is adjusted to the predetermined temperatures c and c', respectively, using the temperature regulating section of l. do. 1ll is a temperature correction section, which determines TO based on the set temperature/degree T1 set by the temperature setting section 8 and the correction temperature TW+. 1v E Comparison section compares TO and sensor salt Tc-n -Tc read every sampling time △X, and Tc≧T
Wait for O. (2) is a heat amount control unit which outputs an output SS to the proportional valve of the heating control means 2 according to the temperature To -Td. XIIND indicates a program that stops the operation when a preset cooking time X ends. In addition,
A, b for calculating the corrected temperature TW+ of the steel type detection part are constants.

FIG. 6.6 shows another embodiment of the steel type detection section I shown in FIG. 4. This is due to the unstable time period of the temperature rise of sensor 6 immediately after ignition, and when a thersistor with the characteristics shown in FIG. Due to reasons such as insufficient resolution, the slope value of the temperature rise at the bottom of the pot is detected after a predetermined period of time has elapsed after ignition or after a predetermined period of time after reaching a predetermined temperature.

In Figure 11, the horizontal axis is temperature T'C, and the vertical axis is resistance RKQ.
A characteristic diagram of a sursistor with l=mu(T+273ΣnexpT+273) (where mu, n, and m are constants) is shown for reference. Figure A in Figure 6.6 shows a method of detecting the steel type detection part using the temperature rise characteristics of the sensor salt B, similar to Figure 2, and the opening of the figure shows a flowchart for that part. FIG. 6 shows the temperature gradient W+ = Tb in 1 minute after a predetermined time (10 seconds in the example) has elapsed immediately after ignition.
-Ta is detected, and FIG. 6 shows the temperature gradient in one minute after reaching a predetermined temperature (in the example, 30'C) after ignition! + = Tb −Ta
This is example 1 where .

Fig. 7 shows another example of the steel type detection part, and the heating start temperature Ta
This figure shows one with a correction section (2) according to the above. This correction section■ is
Using the heating start temperature Ta as a function, L and a constant S are calculated for the comparison value. Then, the slope value W1 is detected, and if Wl is the comparison value, which is less than or more than L, the temperature correction TW of the predetermined temperatures c and c' is performed as the special pot 4 as described above.
Do +. If the comparison value is within the range of L, it is a common pot 4
This is a configuration in which the corrected temperature Tw1 is calculated using the constant a and the calculated constant S using the slope value W1 as a function.

In addition, the comparison value of the correction section (■) is L, d is used to calculate a constant
e, f, g, h, and i are constants.

FIG. 8 shows a specific embodiment of the present invention.

The core of the temperature control device is an LSI chip 100, and in this example, a microcomputer, which is a general-purpose chip using a stored program, is used. S*, Sl,
MuQ, AI, Mu2. System 5 is input terminal -1GO, C+
,C2,Os,G<,05. Cb, C; y, Cjs, niq, C1o.

C++, C+2. Js', D+, D2. Ds, D4. D
s, DJj output terminal, Vov and Vss are power supply terminals, RESET is chip initialization terminal, C8o
indicates a terminal for basic clock oscillation. The input terminal S1 is a terminal for inputting the commercial power frequency to the microcombiner
3, the waveform is shaped and input. The microcomputer 100 counts the commercial power frequency (for example, 60 ratio) as a reference time for a cooking time timer or the like. The terminal SO is connected to a resistor 104 in order to select the operation sequence of the microcomputer 100 in accordance with the commercial power frequency that varies depending on the region.
This is a terminal to which the potential of SO, that is, the logic signal/bell, is changed and input depending on the presence or absence of the jumping wire 106.

(0, C+, C2, (33, C4 are light emitting diode units that display the cooking temperature or time) These are output terminals for driving IQ6, and the latch circuit 107 and the light emitting diode drive circuit 108 connect Tagata apt to C4. The corresponding light emitting diode 106' lights up.

A resistor group 109 represents a current limiting resistor for the light emitting diode 106'.

In addition, output terminals Cs, C6, Cノ, Go, C9, C+o,
C++ and C+2 are the driving outputs of the proportional control valve 21, and 8
The amount of combustion can be controlled in 28/266 steps with bits. Here, 110 is a launch circuit, 111 is a D/M converter circuit that converts the 8-bit digital output of the microcomputer 100 into a corresponding analog potential, and 112 is a hold circuit that holds the output of the D/M converter circuit 111. , drives the proportional control valve 21 through the amplifier circuit section 113.

Terminal D4 is for driving a buzzer 114 that notifies necessary points during cooking, such as the end of cooking, and is connected to the oscillation circuit 11.
6 to sound the buzzer. Here, the oscillation circuit 116 may be replaced by the clock of the microcomputer 100. Ds indicates a drive terminal for the electromagnetic valve 22 for stopping combustion, and D6 indicates a drive output terminal for the igniter 31. Also D4.
The output data of Ds and D6 are latched by the latch circuit 116. Here, latch circuit 107. ,． 110,
116 and the hold circuit 112, the take is updated by the output terminal D3.

Input terminal MUG, M1. Mu2. Reference numeral 5 indicates a terminal for inputting 4-bit data to the microcomputer 100.

Terminals M y to M 3 are inputs for the temperature sensor 6 and inputs for detecting ignition misfire of the burner 3, '? Input signals such as input for opening/closing the f-gas cock are connected. The operating temperature range of the gas staple stove described in this example is approximately 6.
The temperature range is 0 to 260°C, and a temperature range of 200°C is required. In order to detect this with a resolution of 1°C, 200 steps are required, and for this purpose it is necessary to input 8-bit data to the microcomputer 100. From the above, the divided potentials of the temperature sensor 6 and the resistor 117 are converted into an 8-bit digital signal by the MU/D conversion circuit 118, and this is divided into the upper 4 bits and the lower 4 bits and inputted. Also, a combustion detection circuit 1 that detects an electromotive force generated by a cock switch 119 and a combustion detection thermocouple 120
The signal No. 21 is also input in the same way. Selection of these input signals is performed by output terminals m, Dl, and D2. 122. -123, 124, 1
25 indicates one input Kabanov circuit.

Further, although omitted here, the set temperature of the temperature sensor 6 may also be input as necessary. If the number of input boards 3 of the microcomputer 100 is larger, for example 8 bits, the number of input boards 3 as described above is 4.
There is no need to divide each bit.

FIG. 9 is a typical example of the architecture of the microcomputer 10o.

The ROM is a fixed storage unit in which control procedures related to settings, displays, and operations are programmed and stored in the form of instruction codes. The microcomputer of this example can store 8-bit instruction codes of up to 204 B steps. IR is an instruction register and temporarily stores instruction codes successively issued from the ROM. The PC is a program counter that specifies and updates the address of the instruction code in the ROM. Since it is necessary to specify the address of a maximum of 2048 steps (-2), 11 bits are required.

5TACK is a register that holds a return address when a subroutine is controlled. MPX126 is
This is a multiplexer that selects an address held in the stack and a specified address when a BR (branch) instruction is executed. lN5T.

DICG is an instruction decoder and decodes the contents of the instruction register.

RAM is a writable and readable data memory that can store and read data in units of 4 bits. The storage capacity is 4 bits) x 128 steps. Addressing of the 128-bit processor is possible with 7 bits, and the RAM address registers include a 3-bit X register and a 4-bit Y register.

The contents of the Y register are also encoded by DECl2 to individually designate the output terminal of OB-C+2.

The MLU is an arithmetic logic unit and performs various processing decisions. Two sets of 4-bit data are input to the MLU in accordance with the instructions, and the processing results are sent to the MLU as necessary.
C (accumulator), OF.

ZF (flag), stored in Y register or RAM. TEMP is a 4-bit register used for temporary storage.

PS is the program status and is a 1-bit register that is reset by the command.C
F is a carry flag and is set when a carry occurs from the most significant bit as a result of processing in the MLU. zF
is a zero flag, and is set when the result of processing in the MU LU is zero.

C indicates a comparison circuit. CG is a clock generator, which generates a basic frequency signal for the operation of the microcomputer, and CNT and SEQ are control circuits 777, which control the internal operating procedures of the microcomputer. The numbers added to the signal lines in FIG. 9 represent the number of bits of the signal lines.

The microcomputer architecture described above is controlled according to instruction codes stored in its own ROM, and as a result controls various devices connected to individual output terminals, and stores heating patterns for quick automatic cooking. and read it.

In the temperature control function of the present invention, all control sequences are stored in the ROM of the microcomputer, and the steel type detection section slope value W1, the temperature of the temperature detection section 7, etc. are stored in the RAM.

As explained above, the cooking temperature control device of the present invention can distinguish the type of pot based on the slope value of the temperature rise during a certain period of time immediately after the start of heating using the steel type detection section when raising tempura or heating milk. , the correction temperature is calculated as a function of the slope value, and the sensor temperature is determined so that the temperature of the food to be cooked becomes the preset temperature, and the optimum temperature for the tempura and the temperature of the milk at the time of drinking are obtained. It is also controlled to maintain the appropriate temperature. Therefore, the temperature of the food to be cooked can be accurately obtained even if the type of steel changes each time the food is cooked.

In addition, by configuring the steel type detection section and the comparison section to measure the slope of the sensor temperature and the sensor temperature by sampling at predetermined time intervals, 1. Control by a microcomputer etc. can be easily performed, and accuracy can be improved just by processing the program. The control temperature can be detected and the system can be configured very easily.

Next, the steel type detection part is tilted after a predetermined time has elapsed or after a predetermined temperature has been reached after ignition, due to the unstable temperature rise of the sensor immediately after ignition and the lack of accuracy of the sensor. With a configuration that detects values, accuracy can be further improved.

1. The correction section of the steel type detection section performs correction based on the heating start temperature and calculates the correction temperature, so that the usage conditions are not limited or the accuracy of the cooking temperature is not deteriorated.

Furthermore, the slope value is greater than or equal to a predetermined value, or
If the slope value is greater than or less than the comparison value calculated from the heating start temperature in the correction section, the predetermined correction temperature will be used.
It can also be applied to special pots that are not ordinary pots.

In this way, an optimal cooking temperature can be obtained regardless of the type of pot (material and thickness), and a convenient heating cooker can be provided.

In this embodiment, a proportional control type gas staple stove is used as an example, but an electric stove or other heating cooker may be used, and an oven other than a stove can also be used.

Furthermore, it is not proportional control.

Low control, on/off control, etc. may be used.

[Brief explanation of drawings]

Fig. 1 is a control system diagram showing one embodiment of the cooking temperature control device of the present invention, and Fig. 2 shows the temperature rise state of the sensor temperature and the temperature of the food to be cooked, and shows the temperature gradient of the steel type detection part and the temperature of the comparison part. A characteristic diagram that also shows the detection state; FIG. 3 is a characteristic diagram that explains the operation of the heat amount control unit after detecting the cooking temperature;
FIG. 4 is a schematic flow diagram showing an example of a case where the control section of the present invention is configured with a microcomputer, and FIGS. 7 is a flow diagram of another embodiment having a correction section, FIG. 8 is a control circuit diagram including the microcomputer of the present invention, FIG. 9 is an explanatory diagram of the architecture of the microcomputer, and FIG. FIG. 10 is a control system diagram of a conventional proportional control system, and FIG. 11 is a characteristic diagram of a server sensor. 2... Heating control means, 21... Proportional control valve, 22... Solenoid valve, 3... Burner (
heating means), 4...pot, 5...cooked food, 6...temperature sensor, 7...temperature detection unit, 8...・Temperature setting section, 9. I... Steel type detection section, 10. G...Temperature correction section, G...
・Temperature regulation department, 11. ■・・・Comparison section, 12. ■
・・・・・・heat control unit, ■・・・correction unit, Wl
......Incline value, TW+...Correction temperature, T
1...Set temperature, TO--Corrected temperature, T...Heating start temperature or slope value detection start temperature, K, L...Predetermined value or comparison value, c
, c'...predetermined temperature, △X...
...Sampling time. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] (1) A means for heating the food, a temperature detection unit that detects the temperature of a temperature sensor in contact with the bottom of the pot, a temperature setting unit that can be set arbitrarily, and the aforementioned self-temperature detection unit. A temperature correction unit that corrects the set temperature based on the attached steel type detection unit that detects the temperature rise slope of the bottom of the pot, and a heating unit that controls the heating amount of the heating means! a heat amount control section that outputs a control signal to the ilJ control means, and a comparison section compares the temperature signal of the temperature detection section and the temperature corrected by the temperature correction section, and increases or decreases the heat amount of the heating control means. A cooking temperature control device that maintains the temperature of the food to be cooked at a constant level by controlling the amount of heat or stopping the heat amount control unit. @) The cooking temperature control device according to claim 1, wherein the steel type detection unit is configured to calculate the corrected temperature as a function of the slope value of the temperature rise at the bottom of the pot during a certain period of time immediately after ignition. (3) The steel type detection unit is configured to calculate a correction temperature as a function of the slope value of the temperature rise at the bottom of the pot over a certain period of time after a predetermined time has elapsed after ignition or after a predetermined temperature has been reached. A cooking temperature control device according to claim 1. (4) The cooking temperature control device according to claim 1 or 2, wherein the steel type detection section is provided with a correction section based on the heating start temperature. (6) The steel type detection unit performs temperature correction to a predetermined temperature if the slope value of the temperature rise at the bottom of the pot over a certain period of time is less than or equal to a predetermined value. temperature control device. (6) The steel type detection unit corrects the temperature by a predetermined temperature if the slope value of the temperature rise at the bottom of the pot over a certain period of time is less than or more than the comparison value calculated as a function of the heating start temperature. The cooking temperature control device according to scope 1. (7) The cooking temperature control device according to claim 1, wherein the comparison section compares the temperature signal detected by the temperature sensor at regular time intervals with the corrected temperature of the temperature correction section.