JP2000171041A - Flat cooking appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat cooking appliance capable of preventing excess cooling or heating of a material to be cooked in a cooking container by automatically controlling a heating amount of a burner. SOLUTION: A burner 3 provided at a bottom of a recess 2 formed to be recessed down from a plate 1 heats a cooking container 5 disposed at a grate 6 having the same height as that of the plate 1. A temperature sensor 7 is brought into contact with the bottom of the container 5 to detect its temperature. A control unit 8 switches a heating amount of the burner 3 from small to large when the sensor temperature becomes a first control temperature or lower, and switches the amount from the large to the small when the sensor temperature becomes a second control temperature. A control unit 8 obtains an overshoot amount of the sensor temperature from the previous time second control temperature, and obtains a first reference temperature of a lower temperature by a predetermined temperature than the previous time second control temperature. Further, the unit 8 sets the first control temperature of next time to a higher temperature than the first reference temperature according to the overshoot amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat stove for cooking by heating a cooking container in which a food is placed with a burner.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. Hei 6-319653, a temperature sensor for detecting the temperature of a cooking container by contacting the bottom surface of the cooking container is provided. A stove is known in which the amount of heating of the burner is automatically controlled in accordance with the "temperature".
According to such a stove, as shown in FIG.
The amount of heating of the burner is controlled in accordance with the change in (dotted line), and the oil temperature Θ (dotted line) is maintained in a predetermined oil temperature range (hatched zone in the figure). That is, when the sensor temperature T rises up to the second control temperature T ₂ (point x), heating of the burner is switched from the large to the small. Further, when the sensor temperature T is lower than the second control temperature T ₂ to the first control temperature T ₁ of the low temperature (point x '), the heating of the burner is switched from small to large. Hereinafter, although not shown, the switching of the heating amount of the burner is repeated, and the oil temperature 上下 is maintained within a predetermined oil temperature range while increasing and decreasing similarly to the sensor temperature T. The temperature difference between the first control temperature T ₁ and the second control temperature T ₂ is adjusted according to the amount of oil in the cooking vessel, and the oil temperature Θ
Is maintained in a predetermined oil temperature range.

[0003] However, the flat stove, which is a form of the stove, has the following disadvantages. In the flat stove, a horizontally recessed plate is provided with a concave portion that is recessed downward, a burner is provided at the bottom of the concave portion, and a height equal to the plate height is provided above the burner. In the flat stove having such a configuration, when the cooking container is placed in a virtue, the heat of the burner tends to stay in the recess. For this reason, as shown in FIG. 9, the sensor temperature T (solid line)
There with slightly larger overshoot from the second control temperature T _2, decreases slowly. Therefore, when the sensor temperature T drops to the first control temperature T ₁ (point x ″), that is, when the burner heating amount is switched from small to large, the oil temperature を falls within the predetermined oil temperature range as indicated by the solid line. There is an inconvenience that it is falling off.

[0004] The temperature sensor is in contact with the bottom of the cooking vessel, and when a heavily loaded food such as a frozen croquette is poured into the oil, the food sinks to the bottom of the cooking vessel and the oil temperature drops so much. Even if not, the sensor temperature may drop significantly. That is, the correspondence between the actual oil temperature and the sensor temperature may be lost. In FIG. 10, when the heating amount of the burner is small and the sensor temperature T is between T _{1 and} T ₂ (point y), the sensor temperature T when cooking with a large load is put into the oil.
And the behavior of oil temperature Θ (both solid lines). Sensor temperature T by food supply to the oil is usually faster and lower than, when lowered to the first control temperature T ₁ (point y '), the heating of the burner is switched from small to large. After that, the sensor temperature T continues to further decrease and then increases, and the second control temperature T ₂
(Point y ″), the amount of heating of the burner is switched from large to small. On the other hand, the oil temperature す る drops sharply as the cooking material is poured into oil, but the oil temperature Θ becomes faster than the sensor temperature T. elevated begins, there is a disadvantage that has risen beyond a predetermined oil temperature range when the sensor temperature T rises to the second control temperature T _2.

[0005]

SUMMARY OF THE INVENTION In view of the above background, the present invention can prevent a food or the like in a cooking container from being excessively cooled or heated by automatically controlling a heating amount of a burner. The purpose is to provide a flat stove.

[0006]

Means for Solving the Problems To solve the above-mentioned problems, a flat stove according to the present invention comprises a horizontally installed plate, a recess recessed downward from the plate, and a cooking container placed on the recess with the plate. Gentoku placed at the same height, a burner provided at the bottom of the concave portion and heating the cooking container placed on the gode, and detecting the temperature of the cooking container by contacting the bottom surface of the cooking container. A temperature sensor for switching the amount of heating of the burner from a small amount to a large amount when a temperature detected by the temperature sensor is equal to or lower than a first control temperature; A heating stove comprising: a heating amount control unit that switches a heating amount of the burner from large to small; wherein the heating amount control unit determines a detection temperature of the temperature sensor each time the heating amount of the burner is switched from large to small. The amount of overshoot from the second control temperature is obtained, the first reference temperature lower than the previous second control temperature by a predetermined temperature is obtained, and the next first control temperature is calculated according to the amount of overshoot. The temperature is set higher than one reference temperature.

In the flat stove, it is determined how much the sensor temperature becomes higher than the temperature at the time of the previous second control temperature, that is, the temperature at the time when the heating amount of the burner was switched from large to small immediately before (the amount of overshoot). Can be In addition, a first reference temperature lower than the previous second control temperature by a predetermined temperature is obtained. Then, the next first control temperature, that is, the temperature at which the heating amount of the burner is switched from small to large immediately afterward, is set higher than the first reference temperature in accordance with the overshoot amount. That is, when the overshoot amount is 0, the next first control temperature is set equal to the first reference temperature, and as the overshoot amount increases, the first control temperature is set higher than the first reference temperature. Thus, it is possible to prevent the time from when the heating amount of the burner is switched from large to small to when the sensor temperature decreases to the next first control temperature from being substantially extended according to the overshoot amount. Can be. Then, it is possible to prevent the oil temperature from falling out of the predetermined oil temperature range.

When the overshoot amount is 0, the next control temperature is set to be equal to the first reference temperature. Therefore, at least the sensor temperature is required until the sensor temperature decreases from the previous second control temperature by a predetermined temperature. During this time, the heating amount of the burner is kept small. Therefore, the predetermined temperature is set such that the amount of heating of the burner is kept small enough that the oil temperature does not fall out of the predetermined oil temperature range.

In the flat stove, the heating amount control means obtains an undershoot amount of a temperature detected by the temperature sensor from a previous first control temperature every time the heating amount of the burner is switched from small to large, Further, a second reference temperature that is higher by a predetermined temperature than the previous first control temperature may be determined, and the next second control temperature may be set lower than the second reference temperature according to the amount of undershoot.

[0010] In such a flat stove, how much lower (undershoot) the sensor temperature becomes lower than the previous first control temperature, that is, the temperature immediately before the heating amount of the burner was switched from small to large is determined. Can be Further, a second reference temperature that is higher by a predetermined temperature than the previous first control temperature is obtained. Then, the next second control temperature, that is, the temperature at which the heating amount of the burner is switched from large to small immediately afterward, is set lower than the second reference temperature according to the amount of undershoot. That is, when the amount of undershoot is 0, the second control temperature for the next time is set equal to the second reference temperature, and is set lower than the second reference temperature as the amount of undershoot increases. Accordingly, it is possible to prevent the time from when the heating amount of the burner is switched from small to large to when the sensor temperature rises to the next second control temperature from being substantially extended according to the amount of undershoot. Can be. Then, it is possible to prevent the oil temperature from rising beyond the predetermined oil temperature range.

When the undershoot amount is 0, the next second control temperature is set to be equal to the second reference temperature. Therefore, at least until the sensor temperature rises by a predetermined temperature from the previous first control temperature. During this time, the heating amount of the burner is kept large. Therefore, the predetermined temperature is set such that the amount of heating of the burner is maintained large enough that the oil temperature does not rise beyond the predetermined oil temperature range.

In the flat stove, when the detected temperature of the temperature sensor overshoots a set temperature higher than the previous second control temperature, the heating amount control means sets the second reference temperature to the first first temperature. The temperature may be set to be higher than the control temperature by exceeding the predetermined temperature range.

Here, when the sensor temperature exceeds the set temperature which is higher than the previous second control temperature and overshoots, the sensor temperature changes from the previous second control temperature to the next first control temperature. This set temperature is determined from the viewpoint that the time may be excessively long. That is, when the sensor temperature exceeds the set temperature and greatly overshoots, the time during which the heating amount of the burner is kept small becomes excessively long, and the oil temperature drops significantly. In such a case, the time required for the sensor temperature to reach the next second control temperature from the next first control temperature, that is, the time during which the heating amount of the burner is maintained at a large value may be too short. There is a possibility that the lowered oil temperature does not rise so much and cannot be restored. Therefore, when the sensor temperature overshoots from the set temperature, the second reference temperature is changed to the previous first temperature.
The temperature is set higher than the control temperature by exceeding a predetermined temperature range. As a result, the second reference temperature is set to be higher than the normal time when the sensor temperature does not exceed the set temperature, and the second control temperature set based on the second reference temperature is also set to be higher. The above situation can be avoided.

[0014] In the flat stove, the heating amount control means may set the next second control temperature to be equal to the second reference temperature when the undershoot amount is less than a predetermined amount. When the amount of undershoot is less than the predetermined amount, the oil temperature does not decrease so much from the lower limit of the predetermined oil temperature range. Therefore, in such a case, even if the next second control temperature is not set lower than the second reference temperature,
It is possible to avoid that the time during which the heating amount of the burner is maintained to be large is excessively long and the oil temperature rises beyond the predetermined oil temperature range.

When the amount of heating of the burner is switched from small to large in a situation where the correspondence between the sensor temperature and the actual oil temperature is broken, the oil temperature rises beyond a predetermined oil temperature range, and conversely, the predetermined oil temperature increases. The temperature may fall outside the temperature range. Thus, in the flat stove, an upper limit is provided for the first control temperature and a lower limit is provided for the second control temperature, whereby such a situation can be avoided.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flat stove according to the present invention will be described with reference to the drawings. FIG. 1 is an explanatory configuration diagram of a flat stove according to the present embodiment, FIG. 2 is a flowchart illustrating a method of controlling a burner heating amount of the flat stove according to the present embodiment, and FIG. 3 is a characteristic of the flat stove according to the present embodiment. FIG. 4 is a flowchart illustrating a method of setting the first control temperature of the flat stove according to the present embodiment.
FIG. 5 is an explanatory diagram of a method of setting the first control temperature of the flat stove according to the present embodiment, FIG. 6 is a flowchart showing a method of setting the second control temperature of the flat stove of the present embodiment, and FIG. FIG. 8 is an explanatory diagram of a method of setting a second control temperature of the flat hob according to the embodiment, and FIG. 8 is an explanatory diagram of characteristics of the flat hob according to the present embodiment.

As shown in FIG. 1, in the flat stove according to the present embodiment, a horizontally installed plate 1 is recessed downward to form a recess 2, and a burner 3 is provided at the bottom of the recess 2. Above the burner 3, there is provided a got 6 on which a cooking vessel 5 containing cooking oil 4 or the like is placed at substantially the same height as the plate 1. In addition, a temperature sensor 7 that contacts the bottom surface of the cooking vessel 5 and detects the temperature of the cooking vessel 5
And a control unit (heating amount control means) 8 for controlling the amount of heating of the burner 3 in accordance with the temperature detected by the temperature sensor 7 and performing various controls. Gas is supplied to the burner 3 from a gas supply path 9 and is ignited by an unillustrated spark plug and burns. The gas supply path 9 is provided with a gas solenoid valve 10 that is opened and closed by a control unit 8.
The gas supply path 9 is provided with a bypass path 11 that branches off in the middle and then joins again. The bypass path 11 is provided with a bypass solenoid valve 12 that is opened and closed by the control unit 8. When the bypass solenoid valve 12 is opened and closed, the amount of gas supplied to the burner 3 is controlled, and the amount of heating of the burner 3 is switched between large and small.

The control unit 8 has a timer 13. Based on the time measured by the timer 13, 0.5 [s]
Each time, it is determined whether or not the sensor temperature (the temperature detected by the temperature sensor 7) is within a temperature range described later. The control unit 8 is provided with a counter 14.
Reference numeral 4 counts the number of times that the sensor temperature is continuously determined to be within a temperature range described later.

The control of the heating amount of the burner 3 by the control unit 8 in the flat stove having the above-described structure will be described. According to the flat stove of the present embodiment, in order to maintain the oil temperature に in the predetermined oil temperature range indicated by the hatched zone in FIG.
Is controlled. When the burner 3 is initially ignited, the amount of heating is increased (STEP 1), and the sensor temperature T and the oil temperature Θ gradually increase as shown in FIG. When the sensor temperature T becomes equal to or higher than the preset control temperature T ₀ (S
YES in TEP2, point B ₀ in FIG. 3), the amount of heating is switched from the large to the small (STEP3), the sensor temperature T is lowered after increased from the control temperature T _0, similarly the oil temperature Θ after increased slightly descend.

When the sensor temperature T is equal to the first control temperature T ₁ (= T ₀₎
(−2 ° C.) (YES in STEP 4; point A _{1 in} FIG. 3), the heating amount is switched from small to large (STEP 4).
5) The sensor temperature T rises above the temperature T ₀ -2 ° C., and the oil temperature Θ also rises. Further, when the sensor temperature T becomes the second control temperature T
₂ (= T ₀ + 2 ° C.) (Step 6: YE
S, point B _{1 in} FIG. 3), the heating amount is switched from large to small (STEP 7), the sensor temperature T falls below the temperature T ₀ + 2 ° C., and the oil temperature Θ also falls.

Subsequently, the next first control temperature T ₁ is set according to the amount of overshoot of the sensor temperature T from the previous second control temperature T ₂ (STEP 8). Then, when the sensor temperature T decreases to the first control temperature T ₁ set in sequence (points A ₂ , A ₃ ,... In FIG. 3), the heating amount of the burner 3 is switched from small to large (STEP 9). , Sensor temperature T
Rises. The second control temperature T ₂ is set for the next depending on the undershoot amount from the first control temperature T ₁ of the previous sensor temperature T (STEP 10). When the sensor temperature T rises to the second control temperature T _2, which are sequentially set (point B ₂ in FIG. 3, B _3, · ·), the amount of heating is switched from the large to the small (STEP 11), the sensor temperature T decreases. The main feature of the flat stove of the present invention is the setting of the first control temperature T ₁ and the second control temperature T ₂ , which will be described in detail later. Thereafter, STEP8 to STEP11 are repeatedly performed, and as shown in FIG. 3, the heating amount of the burner 3 is maintained in a predetermined oil temperature range while the oil temperature 上下 rises and falls like the sensor temperature in accordance with the switching. When the fire extinguishing operation is performed during the combustion of the burner 3, the burner 3 is extinguished at any time in the flowchart shown in FIG.

Here, the setting of the first control temperature T ₁ (STEP 8) and the setting of the second control temperature T ₂ (STEP 10), which are the main features of the flat stove of the present invention, will be described with reference to FIGS. . Previous first at some point
The (second) control temperature means a temperature at which the heating amount of the burner 3 is switched immediately before that time, and the next first (second) control temperature at a certain time is the burner 3 immediately after that time. 3 means the temperature at which the heating amount is switched.

The next first control temperature T₁Is the sensor temperature T
Is the previous second control temperature T_TwoHow much rise beyond
(Overshoot amount). This implementation
In the embodiment, the sensor temperature T
Is the previous second control temperature T_TwoFrom the next first control temperature T₁
MAX temperature T which roughly corresponds to the maximum temperature up to_{MA X}
Is introduced. Hereinafter, as shown in FIG.
Previous second control temperature T _TwoWhen overshooting from
The next first control temperature T₁How is set
This will be described with reference to the flowchart of FIG.

First, the last second control temperature T is set as T _MAX.
2 is set (STEP 8-1), and T _MAX is set to T ₀ +
It is determined whether the temperature is 10 ° C. or less (STEP 8-
2). When T _MAX is T ₀ + 10 ° C. or less (STEP 8−
2) and the next first control temperature T ₁ is T _MAX -4 ° C.
(STEP 8-3). Note that when the overshoot amount is excessive, that is, when T _MAX is T ₀ +
When it is higher than 10 ° C. (NO in STEP 8-2), the next first control temperature T ₁ is set to T ₀ + 6 ° C. Therefore, the upper limit of the next first control temperature T ₁ is T ₀ + 6 ° C. The reason why the upper limit is set will be described later.

Subsequently, the sensor temperature T continuously becomes T_MAX~ T
_MAXThe number of times within the temperature range of + 10 ° C.
Whether or not the count is three or more
Is determined (STEP 8-5). Such a judgment is made
The reason is that whether or not the sensor temperature T continues to rise is determined.
In other words, whether the sensor temperature T has reached its maximum temperature
This is to judge. The counter 14 counts
Upper limit T to the temperature range of sensor temperature T to be performed_MAXSet + 10 ° C
The reason for excluding noise is from counting
It is. As shown in FIG. 5, the sensor temperature T gradually increases
When the count reaches 3 or more (STEP8-
YES at 5), T_MAXIs the control temperature T₀Lower than + 20 ℃
Is determined (STEP 8-6), and T_MAXBut
T₀If the temperature is lower than + 20 ° C (YE in STEP8-6)
S), T_MAXThe temperature obtained by adding 1 ° C to_MAXAnd
(STEP 8-7). By providing STEP8-6
T _MAXIs T₀+ 20 ° C as the upper limit, and ST
This T in EP10_MAXThe next second control set below
Temperature T_TwoAlso T₀The upper limit is + 20 ° C.
Will be described later.

Hereinafter, STEPs 8-2 to 8-7 are repeated.
Each time, the next first control temperature T ₁Is T₀Over + 6 ° C
T_MAXTogether with an upward arrow in FIG.
Is updated to a high temperature by 1 ° C. The sensor temperature T
Near the maximum value and the count of counter 14 is less than 3
(Step 8-5: NO), the next first
Control temperature T₁Is finally set (STEP 8 immediately before).
-3, 4). At this time, the previous second control temperature T_TwoMore 4
C (the "predetermined temperature" according to the present invention)
(= Previous T_Two-4 ° C) is already required (STE
STEP8-3 immediately after P8-1). And next time
1 Control temperature T₁Is equivalent to the number of upward arrows in FIG.
Overshoot (= T_MAX-The previous T_Two) Depending on the
It is set higher than 1 reference temperature.

[0027] When the sensor temperature T becomes the first control temperature T ₁ following order (YES in STEP8-8), heating of the burner 3 is switched from small to large by control unit 8 (STEP 9). The next first control temperature T ₁ is T
It is decided little by little along with _MAX . Therefore, even when the food is put into the oil sensor temperature T of converting thereinto to drop from suddenly rise, heat of the burner 3 by the control unit 8 in accordance with the first control temperature T ₁ of the next time is set at that time The amount can be switched from small to large.

Next, the next second control temperature T_TwoIs the sensor temperature
The degree T is the previous first control temperature T₁How much lower
(Undershoot amount). Anda
The sensor temperature T is the first control
Control temperature T₁From the next second control temperature T_TwoUp to
MIN temperature T roughly corresponding to the minimum temperature shown in_MINIs introduced
Is done. Note that, as described above, the previous first control temperature T₁Is
Previous second control temperature T _TwoDepending on the amount of overshoot
It is set in the same way. Therefore, the cycle of STEP8 ~ 11
In the next second control temperature T_TwoIs an undershoot
Is set depending on the amount of overshoot as well as the amount
You.

The sensor temperature T is undershot from the first control temperature T ₁ drops after rising to T _MAX, as shown in FIG. 7, when the undershoot amount is three different a in this case, b, a c will be described with reference to the flowchart of FIG. 6 or the second control temperature T ₂ of the next time is set how each.

First, the previous first control temperature T is set as T _MIN.
1 is set (STEP 10-1), and the difference between T _MAX and T _MIN is determined (STEP 10-2a, 2b). At this time, T _MAX is the previous T ₁ + 4 ° C. (STEP 8−
3), T _MAX -T _MIN is (previous T ₁ -T _MIN ) + 4 ° C
Can be expressed as Accordingly, by _obtaining T _MAX -T _MIN , the amount of undershoot of the sensor temperature T from the previous first control temperature T ₁ , that is, the previous T ₁ -T _MIN can be obtained. When T _MAX −T _MIN is less than 10 ° C. (STEP
10-2a), the next second control temperature T ₂ becomes T
_The temperature is set equal to _MAX (STEP 10-3a). T
_{When MAX-} T _MIN is 10 ° C or higher and _lower than 17 ° C (STEP
YES) NO, a by STEP10-2b 10-2a, second control temperature T ₂ of the next time is set to a high temperature by 10 ° C. than T _MIN (STEP10-3b). T _{MA X} -T _MIN 1
When the temperature is equal to or higher than 7 ° C. (NO in STEPs 10-2a and 10-2b), the next second control temperature T ₂ is set to T _MAX −T _MIN by 2
_Is set higher than T _MIN by the temperature multiplied by / 3 (S
TEP10-3c).

Subsequently, the next second control temperature T ₂ becomes T ₀ +
It is determined whether the temperature is 2 ° C. or higher (STEP 10-
4). When it is T ₀ + 2 ° C. or more (YES in STEP 10-4), the next second control temperature T ₂ is not changed, and T ₀ +2
If the temperature is lower than 0 ° C. (NO in STEP 10-4), the next second control temperature T ₂ is updated to T ₀ + 2 ° C. (STEP 10-4).
10-5). Therefore, the lower limit of the second control temperature T ₂ is T ₀ + 2 ° C. The reason for setting the lower limit will be described later.

Here, the sensor temperature T is continuously T _MIN −
The number of times between 20 ° C. and T _MIN is counted by the counter 14, and it is determined whether or not the counted number has become three or more (STEP 10-6). This determination is made to determine whether or not the sensor temperature T has continued to decrease, in other words, whether or not the sensor temperature T has reached its minimum temperature. The lower limit T _MIN -20 ° C. is set in the temperature range of the sensor temperature T at which the counter 14 performs counting.
This is for removing the influence of noise and the like from the count number.
In the case shown in FIG. 7, the sensor temperature T is T _MIN as shown in a to c.
If the count continues to decrease and the count number of the counter 14 becomes three or more (YES in STEP 10-6), it is determined whether or not T _MIN is higher than a temperature obtained by subtracting 39 ° C. from the control temperature T ₀ ( (STEP10-7). T _MIN is T ₀ -3
If the temperature is higher than 9 ° C. (YES in STEP 10-7),
A temperature obtained by subtracting 1 ° C. from T _MIN is newly _defined as T _MIN (S
TEP10-8). The reason why STEP 10-7 is provided here is to eliminate the influence of noise and the like from the sensor temperature T.

[0033] Hereinafter, STEP10-2～10-8 is repeated, T _MIN as indicated by the downward arrow in FIG. 7 each time
Is updated to a low temperature by 1 ° C. Accordingly, case a,
As can be seen from b and c, the next second control temperature T ₂ is T ₀
The temperature is gradually renewed within a range that does not become lower than + 2 ° C. The time during which the sensor temperature T has reached the minimum value and is equal to or less than T _MIN is short, and the count number of the counter 14 is 3
Once was less than times (NO in STEP10-4), a second control temperature T ₂ is finally set for the next (immediately before the S
TEP10-3a, 3b, 3c). At this time, the second reference temperature (= T _MAX ), which is higher than the previous first control temperature T ₁ by 4 ° C. (“predetermined temperature” of the present invention) at normal time, has already been obtained (see STEP 8-3). ). Then, the second control temperature T ₂ of the next time is set to a lower temperature than the second reference temperature in accordance with the undershoot amount corresponding to the number of down arrow (= last T ₁ -T _MIN) in Fig.

[0034] Here, if the overshoot amount where the aforementioned excessive, i.e., the sensor temperature T is T ₀ + 10 ° C. than the second control temperature T ₂ of the previous high temperature during normal ( "set temperature" of the present invention) Consider the case of overshoot.
In this case, the time until the sensor temperature T is lowered to a first control temperature T ₁ of the next from the second control temperature T ₂ of the previous, i.e.,
The time during which the heating amount of the burner 3 is kept small may be too long, and the oil temperature を may fall out of the predetermined oil temperature range and drop significantly. In this case, even if the second control temperature T ₂ of the next time is set to a high temperature by a predetermined temperature than the first control temperature T ₁ of the previous normally, first from the first control temperature T ₁ sensor temperature T of the previous next time to rise to the second control temperature T _2, i.e., the time which the heating amount of the burner 3 is maintained at atmospheric is too short oil temperature Θ might not be raised to a predetermined oil temperature range.

According to the flat stove of the present embodiment, in this case, the STE
P8-4 to 8-7 are repeated, and T _MAX is T ₀ + 10 ° C.
Set to a higher temperature. On the other hand, the first control temperature T ₁ remains at the upper limit T ₀ + 6 ° C. Therefore, in such a case, T _MAX (the “second reference temperature” of the present invention) is 4 ° C. (“the predetermined temperature range” of the present invention) from the previous first control temperature T ₁ (= T ₀ + 6 ° C.). Is set to a high temperature (STE
STEP8-7 after passing through P8-4). That is, the second reference temperature T _MAX and the next second control temperature T ₂ are set so that the sensor temperature T is higher than normal (STEP 8-).
STEP 10-3a-3c after passing through 4-8-7). Thus, it is possible to avoid a situation in which the time during which the heating amount of the burner 3 is maintained at a large value is short and the oil temperature Θ does not rise to the predetermined oil temperature range.

[0036] When the sensor temperature T becomes the second control temperature T ₂ above the next (YES in STEP10-7), heating of the burner 3 is switched from the large to the small by the control unit 8 (STEP 11). Note that the next second control temperature T ₂ is determined in small increments over time together with T _MIN . Even if this order sensor temperature T of converting thereinto to increase from decrease sharply, in accordance with the second control temperature T ₂ that is set at that time, the heating amount of the burner 3 is switched from the large to the small by the control unit 8.

As described above, T ₀ + 6 ° C. is provided as the upper limit of the first control temperature T ₁ , and T ₀ is set as the lower limit of the second control temperature T _2.
0 + 2 ° C, and T ₀ + 20 ° C as the upper limit. this is,
This is to avoid switching the heating amount of the burner 3 at an inappropriate timing, that is, in a state where the correspondence between the sensor temperature T and the actual oil temperature Θ is broken. Therefore, by setting an upper limit to the first control temperature T ₁ and setting upper and lower limits to the second control temperature T ₂ , the oil temperature Θ rises above a predetermined oil temperature range,
It is possible to prevent the oil temperature from falling out of the predetermined oil temperature range. The lower limit on the first control temperature T ₁ of the upper and the second control temperature T ₂ may be appropriately changed in accordance with various conditions.

The first control temperature T ₁ set as described above.
The change in the oil temperature と き when the heating amount of the burner 3 is controlled by the control unit 8 based on the second control temperature T ₂ will be described with reference to FIG. In the figure, a hatched zone indicates a predetermined oil temperature range in which the oil temperature べ き is to be maintained. First, the sensor temperature T and the oil temperature Θ during normal times, that is, when the food is not put into the oil, are represented by solid lines. When the sensor temperature T rises to the second control temperature T ₂ of the last time (point alpha), heating of the burner 3 is switched from large to small. Here, as described above, the next first control temperature T ₁ is set to be higher than the first reference temperature (previous T ₂ -4 ° C.) according to the amount of overshoot (upward oblique arrow) (upward white). Arrow). When the sensor temperature T is lowered to a first control temperature T ₁ of the next (point alpha '), the heating of the burner 3 is switched from the small to large. By setting the next first control temperature T _{1 in} this way, it is possible to prevent the oil temperature Θ from falling outside the predetermined oil temperature range while the heating amount of the burner 3 is small as shown in FIG. can do.

As described above, when the sensor temperature slightly undershoots from the previous first control temperature T ₁ , the next second control temperature T becomes equal to the second reference temperature T _MAX.
2 is set. Here, the previous first control temperature T ₁ is the same temperature as that set as the next first control temperature T ₁ immediately before the heating amount of the burner 3 is switched from small to large. . Then, when the sensor temperature rises to the next second control temperature T ₂ (point α ″), the heating amount of the burner 3 is switched from large to small. Thus, the next second control temperature T ₂ is set. As a result, FIG.
As shown in (2), it is possible to prevent the oil temperature Θ from rising beyond the predetermined oil temperature range while the heating amount of the burner 3 is large.

Next, the sensor temperature at the time when the food was put into the oil
The degree T and the oil temperature Θ are represented by dotted lines. The heating amount of burner 3 is small
At time (point β), cooked foods such as croquettes with oil
Suppose that it is thrown. The sensor temperature T starts to drop sharply,
Previous first control temperature T₁(Point β '),
The heating amount of the toner 3 is switched from small to large. Where
The amount of undershoot (downward diagonal arrow)
The second reference temperature T _MAXLower next control temperature to lower
Degree T_TwoIs set (downward white arrow). And the sensor
The temperature T is the next second control temperature T_TwoRises to (point
β ”), the amount of heating of the burner 3 is switched from large to small
You. Thus, the next second control temperature T_TwoIs set
Then, as shown in FIG.
Prevent temperature from rising above the specified oil temperature range
Can be.

In this embodiment, the next first control temperature T₁Is
T for proportionality factor 1_MAXSet according to the proportional function of
However, as another embodiment, the next first control temperature T₁
Is T _MAXAccording to the increasing function (quadratic function, exponential function, etc.)
It may be set. In still another embodiment,
And T_MAXIn the higher temperature range of the multiple temperature ranges
The first control temperature T for the next time₁Is set to high temperature step by step
It may be made to be. Also in this case, the sensor temperature T
Of the second control temperature T_TwoOvershoot from
The next first control temperature T₁Is the first reference temperature
High temperature can be set. Therefore, the burner 3
After the amount of heat is switched from large to small, the sensor temperature T
First control temperature T₁The time to decrease to below is too long
The oil temperature 著 し く falls significantly outside the specified oil temperature range.
Can be prevented.

In this embodiment, the next second control temperature T ₂ is set in accordance with the proportional function of T _MIN of the discontinuous proportional coefficients (0, 1, 1/3). The next second control temperature T ₂ may be set according to an increasing function (quadratic function, exponential function, etc.) of T _MIN . In yet another embodiment, it may be T _MIN is the second control temperature T ₂ of the next higher in the temperature range of the low temperature side of the plurality of temperature ranges is set to a low temperature in a stepwise manner. In this embodiment, the difference between T _MAX and T _MIN is 10
When the temperature is lower than 0 ° C., the next second control temperature T ₂ is set to be equal to the second reference temperature (= T _MAX ). In another embodiment, the difference between T _MAX and T _MIN is less than 10 ° C. also time may be set to a temperature lower than T _MAX in accordance with the undershoot amount of the second control temperature T ₂ of the next. Above cases, it is possible to set the second control temperature T ₂ of the order to a lower temperature than the second reference temperature as undershoot amount from the first control temperature T ₁ of the previous sensor temperature T increases. Thus beyond the time from the heating of the burner 3 is switched from low to high to the sensor temperature T rises to the second control temperature T ₂ above the next is too long oil temperature Θ is significantly predetermined oil temperature range Can be prevented from rising.

As another embodiment of the present invention, the correspondence between the sensor temperature and the actual oil temperature is likely to collapse, such as when a stove on the glass top plate or a special stove around the sensor is used. Alternatively, the above-described heating amount control may be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory configuration diagram of a flat stove according to an embodiment.

FIG. 2 is a flowchart illustrating a method of controlling a heating amount of a burner of a flat stove according to the present embodiment.

FIG. 3 is a diagram illustrating characteristics of the flat stove according to the embodiment.

FIG. 4 is a flowchart illustrating a method of setting a first control temperature of the flat stove according to the embodiment.

FIG. 5 is an explanatory diagram of a method for setting a first control temperature of the flat stove according to the embodiment.

FIG. 6 is a flowchart illustrating a method of setting a second control temperature of the flat stove according to the embodiment.

FIG. 7 is an explanatory diagram of a method for setting a second control temperature of the flat stove according to the present embodiment.

FIG. 8 is a diagram illustrating characteristics of the flat stove according to the present embodiment.

FIG. 9 is an explanatory diagram showing characteristics of a conventional flat stove.

FIG. 10 is an explanatory diagram showing characteristics of a conventional flat stove.

[Explanation of symbols]

1 ‥ plate, 2 ‥ recess, 3 ‥ burner, 5 ‥ cooking vessel,
6 ‥, 5 徳, 7 ‥ temperature sensor, 8 ‥ control unit (heating amount control means)

Claims (6)

[Claims] 1. A plate placed horizontally, a concave portion recessed downward from the plate, a cooking container placed on the concave portion at the same height as the plate, and a plate provided at the bottom of the concave portion. A burner for heating the cooking container placed in the kitchen, a temperature sensor for detecting a temperature of the cooking container by contacting a bottom surface of the cooking container, and a temperature detected by the temperature sensor being equal to or lower than a first control temperature. Heating amount control means for switching the amount of heating of the burner from small to large when the temperature of the burner is changed, and switching the amount of heating of the burner from large to small when the temperature detected by the temperature sensor becomes equal to or higher than a second control temperature. In the flat stove, the heating amount control means obtains an overshoot amount of the detection temperature of the temperature sensor from the previous second control temperature every time the heating amount of the burner is switched from large to small, and furthermore, No. 2. A flat stove, wherein a first reference temperature lower than a second control temperature by a predetermined temperature is determined, and a next first control temperature is set higher than the first reference temperature in accordance with the overshoot amount. 2. The heating amount control means calculates an undershoot amount of a temperature detected by the temperature sensor from a previous first control temperature every time the heating amount of the burner is switched from small to large. 2. The method according to claim 1, wherein a second reference temperature that is higher by a predetermined temperature than the first control temperature is obtained, and the next second control temperature is set to be lower than the second reference temperature in accordance with the amount of undershoot. Flat stove. 3. The heating amount control means sets the second reference temperature from the previous first control temperature when the detected temperature of the temperature sensor overshoots a set temperature higher than the previous second control temperature. 3. The flat stove according to claim 2, wherein the temperature is set to be higher than the predetermined temperature range. 4. The heating amount control means sets the next second control temperature equal to the second reference temperature when the undershoot amount is less than a predetermined amount. Item 3. The flat stove according to Item 3. 5. The flat stove according to claim 1, wherein an upper limit is set for the first control temperature. 6. The flat stove according to claim 1, wherein a lower limit is set for the second control temperature.