JPS59131829A - Cooking unit - Google Patents

Abstract

PURPOSE:To enable cooking of rice by a method wherein when the rice is cooked, even if the kind of pan or volume of cooking is varied, a boiling point of 100 deg.C of inner temperature in the pan is positively sensed, heating volume is decreased to cook and then moisture is gradually decreased to cause the temperature to be increased and the heating is terminated upon attaining a specified temperature. CONSTITUTION:A heating control unit 10 is operated such that when a heating is performed with a heating specified at an initial heating setting unit 11 simultaneously with an ignition, a bent point C is detected by a bent point sensing unit 8 to cause the heating to be decreased at a heating modification unit 12, moisture content is decreased at a temperature discriminating unit 9, then the temperature is gradually increased up to the specified temperature Te and the heating is terminated. That is, the temperature Ta is a normal temperature and heated by the heat set by an initial heating setting unit 11. Temperature at the bottom part of the pan and the temperature sensed by a pan bottom temperature sensor are increased, resulting in that the temperature is increased from the temperature Tb by a specified stable increased value corresponding to the volume of content 5. Further, the temperature is increased, the temperature Tc is 100 deg.C and the bottom part A of the content 5 is boiled to show a value which is not increased more than 100 deg.C. In this way, even if a cooperative relation between the temperature of the bottom part of the content and the temperature of the sensor is not constant, an accurate sensing of 100 deg.C can be performed and at the same time the heating is decreased from the initial heating to enable sufficient heating and cooking operation.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is a method of cooking in which the amount of heating is properly controlled in a heating cooker such as a stove so that rice can be cooked well even if the type of pot or the amount of rice to be cooked changes. It is related to vessels.

Conventional structure and problems Traditionally, in order to cook rice, a special steel was used, and the temperature was determined by correlating the temperature of a temperature sensor that came into contact with the bottom of the pot with the temperature of the food being cooked (cooked rice), and setting the temperature appropriately. It has been used as a rice cooker by controlling the firepower at that temperature, but even if you try to cook rice in a cooker like a stove, the pot will change or the amount of rice cooked will change. Because they are large and have a high degree of freedom, it is difficult to properly control the firepower, making it difficult to cook delicious rice.

Purpose of the Invention The present invention uses a cooking device that detects the temperature at the bottom of a pot to reliably detect the point at which the internal temperature reaches 100"C and boils even when the type of pot or the amount of rice cooked changes when cooking rice. is possible,
In this respect, the object of the present invention is to provide a cooking device which can cook rice by reducing the amount of heating, gradually removing water and raising the temperature, and stopping heating when the specified temperature is reached.

Structure of the Invention For this reason, the cooking device of the present invention detects the slope of the temperature rise of the contents during rice cooking, determines the bending point according to the slope value, detects the boiling point, and controls the amount of heating. It is configured to perform temperature control suitable for cooking rice.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an example of a control system to which the present invention is applied, and shows an example of a gas staple stove. 1 is
At the gas inlet, the gas passes through a proportional control valve 2 and is combusted in a burner 3. The burner 3 heats the bottom of the rice cooker 4 and the contents 6.
add heat to. A temperature sensor 6 detects the temperature by contacting the bottom surface of the pot 4, and this signal is transmitted to the tilt detection section 7.

The slope detection unit 7 detects the temperature rise slope Tw of the bottom of the pot 4,
A bending value Tu is calculated from the slope Tw.

8 is a bending point detection unit, and the inclination detection unit 7 detects the bending value T.
Once u is determined, the temperature gradient Δ
A bending point C where T becomes small is detected. Reference numeral 9 denotes a temperature determination unit, which determines whether or not a specified temperature Te has been reached. Reference numeral 91 denotes a temperature changing unit which is attached to the temperature determining unit 9 and is capable of changing the designated temperature Te; 10 is a heat quantity control unit which includes an initial heat quantity setting unit 11, a heat quantity changing unit 12, and a stop unit 1;
3, which drives the proportional control valve 2 to control the combustion amount of the burner 3. 14 is a part of a timer, and when a certain period of time has elapsed, the notification unit 15 notifies you.

6, - Here, the heat amount control section 10 is heated at the heating amount set by the initial heat amount setting section 11 at the same time as the ignition, and the bending point detection section 8 is heated.
When the bending point C is detected, the heating amount is reduced by the heat amount changing section 12, and furthermore, the moisture is reduced by the temperature determining section 9, and the temperature gradually rises, and when the specified temperature Te is reached, the heating is stopped. Further, the timer section 14 is set at a specified temperature Te by the temperature determination section 9.
It is designed to be activated as soon as the target is reached.

The designated temperature To of the temperature determination unit 90 may be a predetermined temperature, or a temperature Td+α obtained by adding a predetermined temperature α to the temperature Td at which the bending point C is detected by the bending point detection unit 8. , or a temperature change unit 91 attached to the temperature determination unit 9
The designated temperature To may be changed appropriately in the following manner.

In the present invention, even if the type of rice cooker 4 or the amount of rice to be cooked changes, once the temperature of the water put inside reaches the boiling point, the temperature will not rise any further until the water runs out, reducing the temperature rise at the bottom of the pot. A configuration was adopted in which the bending point C of the slope of the pot bottom temperature was detected.

FIG. 2 shows a characteristic diagram explaining the control operation state on page 6, where the horizontal axis or time, the vertical axis T of characteristic A is temperature, the broken line A is the temperature at the bottom of the contents 6, and the solid line B is the bottom of the pot. temperature sensor 6
The temperature characteristics are shown below. The vertical axis of the characteristic port is proportional control valve 2.
The control current is proportional to the combustion amount of the burner 3.

The temperature Ta is normal temperature, and is heated by the heating amount set by the initial heat amount setting section 11, and both curves A and B rise. The temperature rise at the initial stage of heating is somewhat unstable, but eventually the temperature T
From b, there is a constant and stable temperature rise depending on the amount of contents 5. This temperature Tb is 75-80°C. moreover,
As the temperature continues to rise, the temperature Tc reaches 100''C, and the bottom A of the contents 5 boils and does not rise above 100''C.

(However, the temperature from the center to the top of the contents 6 at this time is lower than 100'C due to little convection, but gradually rises to 100'C.) Sensor temperature B at this time
is Td, and Td is also Td when the content 5 bottom A is 100°C
From the point where the increase becomes very small or disappears. The temperature difference between this Ta point 1oO°C and Td is the temperature difference between the rice cooker 4
It varies greatly depending on the type of rice (material and thickness) and the amount of rice cooked. However, the slope of temperature rise Δ
The inflection point C at which T changes is always after the bottom A of the content 6 has boiled.

Here, the inclination detection unit 7 detects a temperature Tb at which the temperature rise is stable.
The slope T of temperature rise for a fixed time interval ΔxA at the point exceeding
w is measured, this slope Tw is used as a function, and a bending value Tu is calculated using L as a calculation constant, and Tu = −Tw−L. The bending point C that becomes smaller is determined. The operation of this bending point detection section 8 will be explained with reference to FIG.

Until the time Xd when the bending point detection section 8 detects the bending point C, the heating amount is the proportional control valve current Ia set by the initial heat setting section 11 of the heat amount control section 1o. When the bending point C is detected, the heating amount changing unit 12 reduces the heating amount to the proportional control valve current Ib to slowly and sufficiently heat the contents 5. When the entire content 5 is sufficiently heated and boiled, the water content disappears, and the temperature A at the bottom of the content 6 begins to rise above 100'C, and the sensor temperature B also rises accordingly.

Here, the temperature Te specified by the temperature determination section 9 is changed to the time Xe.
When the temperature is reached, the stop section 13 stops the proportional control valve current and stops the heating. As mentioned above, the specified temperature Te may be a predetermined temperature, or a temperature Td+α obtained by adding a predetermined temperature α to the temperature Td at the bending point C, or the temperature may be adjusted depending on the user to achieve the desired degree of scorching. It may be adjusted by the changing unit 91.

The sensor temperature B changes from the temperature Td to Te, and the contents 5 are sufficiently cooked by the heating amount of the proportional control valve current Ib.

At the time Xe, the heating is stopped, and the timer part 14 is activated, and the contents 5 are heated for a certain period of time.

Note that if unevenness occurs, the temperatures A and B gradually decrease because heating stops. Now, when a certain period of time ΔxB has elapsed at time xf and the uneven cooking of the rice has ended, the notification section 15 notifies the end of the rice cooking by turning the buzzer signal ON-OFF as shown in FIG.

FIG. 3 is a diagram showing an example of inclination detection of sensor temperature B and bending inspection 9-base detection. Once the inclination detection unit 7 measures the temperature inclination Tw at a fixed time interval ΔxA from the temperature Tb and calculates the bending value Tu, the process then enters the bending point detection unit 8.
The temperature gradient ΔT is sequentially measured from the temperature (Tn-m-Tn) for each sampling time Δχ, and the point where the temperature gradient ΔT becomes equal to or less than the bending value Tu is determined to be the bending point C.
This is a method of setting the temperature at the bottom of the contents 5 to 100°C at the temperature Td at that time.

If, for example, a microcomputer is used for the control system as described above, all control sequences are stored in a fixed storage ROM, and a writable and readable data memory RAM stores the bending value Tu, the bending Point temperature T
d etc. are programmed in advance to be stored in memory.

Effects of the Invention As described above, the cooking appliance of the present invention measures the slope of temperature rise of the contents, calculates the bending value according to the slope, and detects the bending point, thereby determining the temperature at the bottom of the contents. is 100°
The 10-page structure for detecting when temperature C has been reached means that the correlation between the temperature at the bottom of the rice cooker and the sensor temperature may not be constant due to changes in the type of rice cooker and the amount of rice in the rice cooker. , accurate detection of 100°C is possible. At that time, the amount of heating can be changed from the initial heating amount and reduced at the same time, so that the food can be sufficiently heated and cooked. Furthermore, when the cooking temperature is sufficiently cooked with the reduced heating amount and reaches the specified temperature, heating will stop and the cooking will start to become uneven.
When the rice cooking is finished, it is announced that the rice cooking is finished.

Therefore, by adding a rice cooking sequence, the rice cooker can be used not only for general cooking but also as an automatic rice cooker.

Further, the specified temperature of the temperature determination section may be set to a fixed temperature specified in advance, but it is also possible to set the temperature automatically by adding a predetermined temperature to the bending point temperature. Regardless of the type of rice cooker or the amount of rice cooked, the rice will be cooked in a state that is suitable for each condition.Furthermore, if the specified temperature can be changed using the temperature change section, the rice will be cooked in a state that suits the user's preference. This can be done by adjusting the degree of burntness.

11 l:”Next, when the rice cooking is finished and the whole rice cooking sequence is finished, you will be notified by notification, which is convenient.

Further, as a method for detecting inclinations and bending points, a system can be easily configured by controlling with a microcomputer or the like by determining the difference in sensor temperature by sampling at fixed time intervals.

Although the present embodiment has been described using a gas stove as an example, an electric stove may also be used.

In this way, by changing the bending value for detecting the bending point according to the slope of the sensor temperature, it is possible to accurately detect 10"C regardless of the type of rice cooker or the amount of rice cooked, and furthermore, the heating amount can be controlled. It is possible to provide a cooking device with great practical value that can configure a control sequence optimal for rice cooking, which reduces the heating amount at the bending point and stops at a specified temperature.

[Brief explanation of the drawing]

Fig. 1 is a control system diagram showing one embodiment of the cooking device of the present invention, Fig. 2 A and C are characteristic diagrams explaining the control operation state of the control sequence, and Fig. 3 is a diagram showing the tilt detection section and the control system. A characteristic diagram illustrating the detection state of the bending point detection section is shown. 2... Proportional control valve (heating control means), 3...
... Burner (heating means), 4 ... Rice cooker, 6
...Temperature sensor (temperature detection means), 7...
...Incline detection section, 8...Bend point detection section, 9...
...Temperature determination section, 1o... Heat amount control section, 1
1...Initial heat setting section, 12...Calorific value changing section, 13...Stop section, 14...Timer part, 15...・Notification Department, 91...
Temperature change section, Tw... Incline, Tu...
Bending value, ΔT...Temperature gradient, C...Bending point, Td...Bending point temperature, Te...
...Specified temperature, a...Predetermined temperature. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 (4 × (c)

Claims (1)

[Claims] (1) It has a heating means for heating a rice cooker, and a heat amount control unit for outputting a control signal to a heating control means in accordance with a signal from a bottom level detection means of the rice cooker, and the temperature of the rice cooker is determined by the temperature detecting means. an inclination detection unit that detects an upward slope and calculates a bending value from the inclination; a bending point detection unit that detects a bending point where the temperature gradient is smaller than the bending value; and a bending point signal from the bending point detection unit. As a result, the heat amount control section reduces the heating amount set in the initial heat amount setting section to the heating amount set in the heat amount changing section, and furthermore, as the moisture content decreases, the temperature gradually rises and reaches the temperature specified by the temperature determination section. In addition to providing a stop section that stops the reduced amount of heating, a part of the timer is activated when the temperature determination section reaches the temperature, and after a certain period of time, the notification section issues a notification indicating the end of rice cooking. Cooking device. (→ The cooking device according to claim 1, wherein the temperature specified by the temperature determining section is configured to be changeable by a temperature changing section. 2. The cooking device according to claim 1, wherein the temperature is higher than the temperature at which the bending point is detected by a predetermined temperature.