JP6542652B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker capable of automatic cooking by introducing a heating container containing food in a grill storage.

  Conventionally, a grill storage for heating the food, a grill burner for heating the inside of the grill storage, and a temperature sensor for detecting the temperature inside the grill storage accommodate the food other than cooking using the grill. There is known a heating cooker equipped with a container cooking mode in which the heated container is introduced into the grill storage to perform automatic cooking.

  In this type of cooking device, when cooking using a grill, taking into consideration the case where automatic cooking using a heating container is mistakenly selected, the temperature of the temperature inside the grill storage at the initial stage of heating It has been proposed to determine the presence or absence of a heating container based on the rise width (Patent Document 1). In addition, when the temperature sensor is provided in the exhaust passage, the temperature rise characteristic of the temperature inside the storage is unlikely to differ depending on the presence or absence of the heating container, so when cooking using the heating container, a shielding plate covering the temperature sensor is used. It has been proposed to increase the difference in temperature rise characteristics between the case of using a grill and the case of using a heating container, provided in a grill storage (Patent Document 2).

JP, 2008-104545, A JP, 2010-42075, A

  However, when performing cooking using a heating container, it is not only complicated to install the shielding plate in the grill storage every time, but sometimes the installation of the shielding plate is forgotten or the shielding plate is set incorrectly. In the heating cooker of Patent Document 2, the shielding plate is integrated with the fixed support for installing the heating container at a predetermined position in the grill storage, but the fixed support becomes large, and the grill storage is There is a problem that the ignition parts and the like are damaged at the time of introduction of and the storage space in the kitchen and the like when the cooking using the heating container is not performed becomes large. Furthermore, when the cooking using the heating container is repeated, the shielding plate is also heated by the previous cooking, so the radiant heat from the shielding plate provided in the vicinity of the temperature sensor detects even the cooking using the heating container Increase in the temperature inside the storage room. As a result, the difference in temperature rise characteristics between the case of using a grill and the case of using a heating container becomes small, and there is a possibility that the presence or absence of the heating container can be misjudged. Therefore, it is desirable to accurately determine the presence or absence of the heating container based on the inside temperature without using a separate member such as a shielding plate.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to introduce a heating container containing food into a grill storage to select a container cooking mode in which automatic cooking is performed. Even when the container cooking mode is selected by mistake, the presence of the heating container can be determined with certainty, and the automatic cooking is prevented from being canceled due to the erroneous determination, and the automatic cooking is smoothly performed.

The present invention relates to a grill storage,
Grill burners that heat the inside of the grill storage,
An internal temperature detection unit that detects the internal temperature of the grill storage;
A cooking mode selection unit capable of selecting a container cooking mode in which a heating container containing food is introduced into the grill storage to perform automatic cooking;
A heating cooker having a container determination unit that determines the presence or absence of a heating container based on the temperature in the storage detected by the temperature detection unit in the storage,
When the container cooking mode is selected in the cooking mode selection unit, the grill burner is burned at a predetermined first judgment thermal power for a predetermined first judgment time from the start of heating,
The first temperature characteristic based on the internal temperature detected by the internal temperature detection unit in the first determination time is compared with the first reference temperature characteristic for determining the presence or absence of the heating container in the grill storage, Primary judgment of the presence or absence of the heating container in the storage,
If it is determined that the heating container is “absent” in the primary determination, after the first determination time, the grill burner is burned at a predetermined second determination time, or at a predetermined second determination thermal power which is weaker than the first determination thermal power Let me extinguish,
The second temperature characteristic based on the internal temperature detected by the internal temperature detection unit at the second determination time is compared with a second reference temperature characteristic for determining the presence or absence of the heating container in the grill storage, It is a heating cooker provided with the control structure which carries out the secondary determination of the presence or absence of a heating container in a store | warehouse | chamber.

According to the heating cooker, when the cooking mode selection unit selects the container cooking mode, the grill burner is burned at a predetermined first judgment thermal power from the start of heating for a predetermined first judgment time, so heating in the grill storage The primary determination of the difference in the first temperature characteristics caused by the presence or absence of the container makes it possible to determine the presence or absence of the heating container.
In addition, the temperature inside the grill storage rises due to the primary judgment heating, but there is a large difference in heat capacity between the grill and the heating vessel, so the second power was made lower than the first judgment power. If it is set as the judgment thermal power, the second temperature characteristic that occurs due to the presence or absence of the heating container in the grill storage becomes significantly different. Therefore, after reducing the thermal power of the grill burner to the second determination thermal power, it is possible to reliably determine the presence or absence of the heating container in the grill storage by secondarily determining the difference in the second temperature characteristics in the predetermined second determination time.
And according to the said heating cooker, even when it determines with a heating container "non-existence" by primary determination, without stopping cooking immediately, since it determines the presence or absence of a heating container again by secondary determination, it is primary determination It is possible to avoid unnecessary stoppage of automatic cooking when it is determined that the method is erroneously determined. Moreover, if the heating power of the grill burner is weaker than that of the primary determination in the secondary determination, it is possible to prevent the cooking of the food from advancing excessively during the secondary determination, and automatic cooking can be smoothly continued.

In the above heating cooker, preferably
The first reference temperature characteristic and the second reference temperature characteristic are set based on the internal temperature at the start of heating.

  Since the temperature characteristics differ even if the grill burner is burned with a certain amount of thermal power when the inside temperature (hereinafter referred to as "initial temperature") at the start of heating is low and high, the temperature characteristics differ. According to this, even when the cooking using the heating container is continuously performed, the presence or absence of the heating container can be accurately determined.

The heating cooker is preferably
As a grill burner, it has upper and lower burners,
In the primary judgment, both upper and lower burners are regarded as the first judgment thermal power of strong thermal power,
In the secondary determination, the lower burner is extinguished, and the second determination thermal power is set to be weaker than the first determination thermal power.

  According to the heating cooker, since the thermal power of the upper and lower burners is set to a strong thermal power in the primary determination, the temperature inside the storage can be raised early, and a mistake in selection of the container cooking mode is determined in a shorter time. be able to. Moreover, according to the said heating cooker, since a low-fire burner is extinguished in secondary determination, heating of a grid or a heating container can be suppressed effectively and the difference of 2nd temperature characteristics can be enlarged. On the other hand, if the top fire burner is burned by the secondary determination, it is possible to prevent the cooking of the food from being delayed excessively.

The heating cooker is preferably
The second determination time is set to be shorter than the first determination time.

  According to the heating cooker, since the secondary determination is performed in a short time, it is possible to further prevent the progress of cooking of the food.

  As described above, according to the present invention, in the heating cooker in which the container cooking mode for automatically cooking by introducing the heating container containing the food into the grill storage can be selected, only by the primary determination of the initial heating stage Instead, since the secondary judgment that weakens the thermal power of the grill burner is provided after the primary judgment, it is possible to clarify the difference in temperature characteristics depending on the presence or absence of the heating container in the grill storage. Thereby, the presence or absence of a heating container can be determined reliably, without using the shielding board for preventing the influence of the combustion exhaust_gas | exhaustion to a chamber internal temperature detection part. Therefore, according to the present invention, the automatic cooking can be properly stopped if the container cooking mode is selected by mistake. Moreover, even when the cooking using the heating container is repeated, the unnecessary stop of the automatic cooking due to the erroneous determination can be prevented, and the automatic cooking can be smoothly continued.

FIG. 1 is a schematic perspective view showing an example of a heating cooker according to an embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional view of the heating cooker of FIG. FIG. 3: is explanatory drawing which shows an example of the operation part of the heating cooker which concerns on embodiment of this invention, (a) shows grilling-net cooking mode, (b) shows container cooking mode. FIG. 4 is a circuit diagram showing an example of the heating cooker according to the embodiment of the present invention. FIG. 5 is a correlation diagram showing the relationship between the heating time and the temperature in the storage compartment due to the difference in the cooking utensils introduced into the grill storage in the heating cooker according to the embodiment of the present invention, (B) shows the case where the initial temperature is 100 ° C., and (c) shows the case where the initial temperature is 200 ° C. FIG. 6 is a correlation diagram showing the relationship between the initial temperature and the first temperature difference due to the difference in the cooking utensils introduced into the grill storage in the heating cooker according to the embodiment of the present invention. FIG. 7 is a correlation diagram showing the relationship between the initial temperature and the second temperature difference due to the difference in the cooking utensils introduced into the grill storage in the heating cooker according to the embodiment of the present invention. FIG. 8 is a flowchart showing an example of the control operation when the container cooking mode is selected in the heating cooker according to the embodiment of the present invention.

The heating cooker according to the present embodiment will be specifically described below with reference to the drawings.
FIG. 1 is a schematic perspective view showing an example of a heating cooker of the present embodiment applied to a gas stove, and FIG. 2 is a schematic longitudinal sectional view thereof. As shown in FIG. 1, the gas stove is provided with a plurality of stove burners 31, 32 and 33 on the top surface of the top plate 30, and the grill storage 2 is provided inside the stove main body 3. The grill storage 2 accommodates cooking utensils such as a grill 15 made of a metal wire rod and a heating container 5 made of metal or pottery. In this gas stove, the grill 15 and the heating vessel 5 are used interchangeably, so FIG. 2 shows an example using the heating vessel 5. In front of the top surface of the top plate 30, a liquid crystal display unit 300 for displaying an operating state, a cooking mode, cooking conditions and the like is disposed, and a display panel can be viewed. In this specification, the direction in which the grille door 21 and the back side of the grille 2 are opposed is referred to as the front-rear direction, the width direction of the grille 2 is referred to as the left-right direction, and the height direction of the grille 2 is referred to as the up-down direction.

  As shown in FIG. 2, the front opening 100 of the grill storage 2 is provided with a grill door 21 that slides open and closed in the front and back direction. Below the rear surface of the grille door 21, a connecting plate 210 is extended toward the inside of the grill storage 2, and to the connecting plate 210 is connected a support frame 18 made of a metal wire on which the saucer 16 is placed. It is done. The support frame 18 is provided with front and rear support parts 180 for supporting the container support 19 for installing the grille 15 or the heating container 5 from below, with the front and rear sides projecting upward. The container support 19 is a substantially rectangular metal frame, and with the front and back portions of the container support 19 mounted on the front and rear supports 180 of the support frame 18, the container support 19 is formed in the frame of the container support 19. The heating container 5 is placed at a predetermined position in the grill storage 2 by dropping the heating container 5 and placing the left and right grips of the heating container 5 main body on the left and right support frame portions. As a result, the heating container 5 and the juice receptacle 16 are pulled out to the front of the grill storage 2 by pulling the grill door 21 to the front, and the heating container 5 and the soup receptacle 16 are stored in the grill storage It is comprised so that it may be accommodated in two.

  At the central portion of the upper wall in the grill storage 2, an upper fire burner 56 for heating the heating container 5 from above is provided. Further, a lower fire burner 55 for heating the heating vessel 5 from the side and the lower side is provided at a position lower than the central part of the left and right side walls in the grill storage 2. The lower burner 55 may be provided on only one side wall. An exhaust duct 17 is continuously provided at the back end of the grill storage 2, and the exhaust duct 17 is an exhaust passage 13.

  A first temperature sensor 14 a and a second temperature sensor 14 b are disposed below the first temperature sensor 14 a at the left and right center of the rear wall of the grill storage 2. The inside temperature of the grill storage 2 is detected by the first and second temperature sensors 14a and 14b, and a detection signal of the inside temperature is output to a control device C described later. In the gas stove of the present embodiment, control of automatic cooking is executed based on the temperature inside the chamber detected by the first temperature sensor 14a, and control of prevention of ignition is executed based on the temperature inside the chamber detected by the second temperature sensor 14b. Be done.

  Returning to FIG. 1, the operating unit 23 located on the right side of the grille door 21 includes the point of the power switch 29 and the stove burners 31, 32, and 33, and the point fire extinguishing switch 24, 25 and 26 having the fire extinguishing and thermal power adjustment function. Is provided. On the other hand, in the operation unit 36 formed on the left side of the grille door 21, there are a grille switch 37 which combines the function of fire extinguishing and thermal power adjustment function of the upper and lower burners 56 and 55, and the kangaroo type operation unit 38 below it. It is provided.

  As shown in FIG. 3, the operation unit 38 is provided with an operation unit 380 of a touch panel type. In the operation unit 380, a cooking material such as fish is placed on the grille 15 in the grill storage 2 and a cooking net cooking mode for automatically cooking and a heating container 5 containing the food in the grill storage 2 are installed. And an automatic menu switch 381 (cooking mode selection unit) for selecting a predetermined automatic cooking mode such as a container cooking mode for automatic cooking, and a cooking selection switch 382 for selecting a type of cooking from each automatic cooking mode, The display unit 384 includes a baking condition selection switch 383 for setting the degree to which the food is baked or finished in the automatic cooking mode. Specifically, as shown in FIG. 3, every time the auto menu switch 381 is operated, a grill cooking mode using the grill 15 or a container cooking mode using the heating container 5 is alternatively selected. Lights up. Also, each time the cooking selection switch 382 is operated, in the case of the grill cooking mode, the dried fish, the grilled fish, and the fillet are alternatively selected and lighted and displayed on the display unit 384 (FIG. 3A). In the case of the container cooking mode, the timer setting is alternatively selected as the gratin or meat sauce, and the light is displayed on the display unit 384 (FIG. 3 (b)). Furthermore, each time the baking condition selection switch 383 is operated, in the case of the grill cooking mode, the strong, standard or weak baking is alternatively selected and lighted on the display unit 384, and the container is cooked In the case of the mode, similarly, the finish of the strong, standard, or weak is alternatively selected and lit and displayed on the display unit 384.

  FIG. 4 is a circuit diagram of the gas stove of the present embodiment. The control device C controls not only the upper and lower burners 56 and 55 but also the combustion of the stove burners 31, 32 and 33, but only the upper and lower burners 56 and 55 will be described below, and the stove burners 31, 32 and 33 will be described. The description is omitted.

  As shown in FIG. 4, branch pipes 551 and 561 branched from the gas supply pipe 550 are connected to the upper and lower burners 56 and 55 respectively, and the gas supply pipe 550 includes the main valve V1, the governor G, and the electromagnetic A safety valve V2 is interposed. Each of the branch pipes 551 and 561 is provided with thermal power adjustment plates T1 and T2 for adjusting the orifice and changing the flow rate of the fuel gas by the operation of a stepping motor (not shown), and on the downstream side of the thermal power adjustment plates T1 and T2. The latch valves V3 and V4 are provided. The control device C controls the operation of the main valve V1, the solenoid safety valve V2, the latch valves V3 and V4, and the stepping motor. Specifically, when the main valve V1 and the electromagnetic safety valve V2 are opened and closed, fuel gas is supplied or stopped to both the upper and lower burners 56 and 55. Further, by operating the stepping motor to adjust the orifices of the thermal power adjustment plates T1 and T2, the thermal powers of the upper and lower burners 56 and 55 are changed between the high thermal power and the low thermal power, respectively. Further, by closing the latch valves V3 and V4, the supply of fuel gas to the upper and lower burners 56 and 55 is shut off. Further, in the vicinity of the respective flame holes of the upper and lower burners 56 and 55, ignition electrodes 501 and 601 for performing spark discharge by applying a high voltage from the igniter 600, and flame sensors 502 and 602 are disposed.

  The control device C includes the first and second temperature sensors 14a and 14b, the power switch 29, the grille switch 37, the main valve V1, the solenoid safety valve V2, the stepping motor, the latch valves V3 and V4, the liquid crystal display 300, and the operation The part 380, the igniter 600, and the flame sensors 502, 602, etc. are connected via electrical wiring.

  Although not shown, the control device C that controls the grill storage 2 incorporates a microcomputer in which a control program is stored. The microcomputer determines the presence / absence of the heating container 5 based on the internal temperature detected by the first temperature sensor 14a when the container cooking mode is selected as the functional configuration, the main valve V1, the electromagnetic It has a combustion control unit that operates the safety valve V2, the stepping motor, and the latch valves V3 and V4 to control the thermal power of the upper and lower burners 56 and 55, a timer, and the like. In the memory of the microcomputer, when the container cooking mode is selected, the upper and lower burners 56, 55 for determining the presence or absence of the heating container 5 in the primary determination and the secondary determination according to the conditions of the container cooking mode. Of the first and second judgment thermal powers Pa and Pb, the first and second judgment times ta and tb, and the initial temperature T0, the first and second reference temperature differences Y1,1, which are the first and second reference temperature characteristics. Data tables such as Y2, total cooking time, and the thermal power of the upper and lower burners 56 and 55 after the secondary determination are stored.

  In the gas stove of the present embodiment, a method of determining the presence / absence of the heating container 5 when the container cooking mode is selected will be schematically described. First, when the container cooking mode is selected, the presence / absence of the heating container 5 is first determined Be done. In this primary determination, the thermal power of the upper and lower burners 56, 55 is set as the first determination thermal power Pa (for example, both upper and lower burners 56, 55 are strong thermal power), and the inside of the chamber at a predetermined first determination time ta (for example, 5 minutes) If the first temperature difference (Ta−T0) between the temperature Ta and the initial temperature T0 is equal to or less than the predetermined first reference temperature difference Y1 corresponding to the initial temperature T0, it is determined that the heating container is “present” and the first reference If the temperature difference is larger than Y1, it is determined that the heating container is "absent".

  Next, in the gas stove of the present embodiment, the presence or absence of the heating container 5 is secondarily determined without extinguishing the upper and lower burners 56 and 55 immediately even if the heating container is determined to be "none" in the primary determination. In this secondary determination, the thermal power of the upper and lower burners 56 and 55 is set as the second determination thermal power Pb (for example, the upper flame burner 56 is a strong flame power and the lower flame burner 55 is extinguished), and a predetermined second determination time tb (for example, 1 If the second temperature difference (Tb-Ta) between the internal temperature Tb at the time of the minute) and the internal temperature Ta at the first determination time ta is larger than the predetermined second reference temperature difference Y2 corresponding to the initial temperature T0 If it is determined that the heating container is "present" and the second reference temperature difference Y2 or less, it is determined that the heating container is "absent".

  In FIG. 5, different cooking utensils are introduced into the grill storage 2 and the upper and lower burners 56, 55 are burned with the thermal powers Pa and Pb in the above primary determination and secondary determination, and then the upper and lower burners 56, 55 are burned with strong thermal power The change of the storage internal temperature by the difference of the initial temperature T0 at the time of making it show is shown. In FIG. 5, (a) shows an initial temperature T0 of 30 ° C., (b) shows a measurement result when the initial temperature T0 is 100 ° C., and (c) shows a measurement result when the initial temperature T0 is 200 ° C. In each of the measurement results, the solid line indicates the change in the internal temperature when the grill 15 is introduced, and the broken line indicates the internal temperature when the container support 19 without the shielding plate and the heating container 5 are introduced. As for the change, the alternate long and short dash line indicates a change in the temperature inside the container when the container support integrated with the conventional shield plate (patent document 2) and the heating container 5 are introduced. In the evaluation in the case where the initial temperature T0 is high, the same cookware was used in consideration of repeated cooking using the grill storage 2.

  As shown in FIG. 5, when the initial temperature T0 is low, the inside temperature (solid line) when the grill 15 is used and the inside temperature (broken line and alternate long and short dashed line) when the heating container 5 is used It can be seen that a large temperature difference occurs in the primary determination at the beginning of heating. In particular, when the initial temperature T0 is low, the difference between the inside temperature when using the container support having the shielding plate and the inside temperature when using the net 15 is the container support 19 without the shielding plate. Is preferable for determination of the presence or absence of the heating container 5. However, as the initial temperature T0 becomes higher, the difference between the inside temperature when using the container support with the shielding plate integrated and the inside temperature when using the grill 15 becomes smaller, and the first judgment time In the vicinity of the end of ta, it can be seen that both have substantially the same internal temperature. This is because, when cooking is repeated using a container support having a shielding plate, the shielding plate introduced into the grill storage 2 by the previous cooking is also heated, and cooking is continuously performed within a short time, This is because the high temperature in the storage compartment is detected by the radiant heat from the shielding plate disposed close to the first temperature sensor 14a. As a result, when cooking in the container cooking mode is repeated using the container support having the shielding plate, the shielding plate is provided to prevent the first temperature sensor 14a from being exposed to the high temperature combustion exhaust. The presence or absence of the heating container 5 may be erroneously determined.

  However, when the thermal power of the upper and lower burners 56 and 55 is weakened to the second judgment thermal power Pb which is smaller than the first judgment thermal power Pa in the secondary judgment executed after the primary judgment, the storage container when the heating container 5 is used It can be seen that the change in the internal temperature is smaller than that in the case of using the grill 15. This is because the heat capacity of the wire mesh 15 made of metal wire is small, and the change of the thermal power of the upper and lower burners 56, 55 linearly affects the temperature inside the chamber, while the heat capacity of the heating container 5 is large. Even if the thermal power of the above is weakened, the decrease in the internal temperature is suppressed by the amount of heat due to heating in the primary determination. In addition, when the initial temperature T0 becomes high, the difference between the inside temperature when using the container support 19 without a shield and the inside temperature when using the grill 15 is the container support having a shield. It can be seen that it is larger than that of using. This is because there is no influence of radiant heat from the shielding plate. Therefore, even if the initial temperature T0 is high, that is, even when the cooking in the container cooking mode is repeated, the difference in temperature characteristics between the case where the grill 15 is used and the case where the heating container 5 is used becomes remarkable. The presence or absence of the heating container 5 can be determined with certainty.

  FIG. 6 shows the change of the first temperature difference (Ta-T0) due to the difference of the initial temperature T0 when the container support 19 without the grille 5 or the shielding plate and the heating container 5 are introduced into the grill storage 2. FIG. 7 similarly shows the change of the second temperature difference (Tb-Ta). As shown in FIG. 6, the first temperature difference (Ta-T0) is different between the case where the grille 15 is used and the case where the heating container 5 is used.

  For this reason, in the gas stove of the present embodiment, heating is performed based on whether the first temperature difference (Ta-T0) exceeds the first reference temperature difference Y1 (eg, Y1 = -0.42 × T0 + 98.8). The presence or absence of the container 5 is set to be determined. Thus, the presence or absence of the heating container 5 at the initial stage of heating can be accurately determined according to the initial temperature T0. In FIG. 6, the first reference temperature difference Y1 is set by a single linear expression, but the first temperature difference (Ta-T0) when the grill 15 is used and when the heating container 5 is used. The first reference temperature difference Y1 according to two or more types of linear expressions may be set in accordance with the difference of the above, or the first reference temperature difference Y1 according to the quadratic expression may be set.

  Moreover, as shown in FIG. 7, 2nd temperature difference (Tb-Ta) differs in the case where the grill 15 is used, and the case where the heating container 5 is used. This is because, as described above, by reducing the thermal power to the second determination thermal power Pb, in the case of the grill 15, the internal temperature drops much more than in the case of the heating container 5.

  Therefore, in the gas stove of the present embodiment, whether the second temperature difference (Tb-Ta) exceeds the second reference temperature difference Y2 (for example, Y2 = -0.11 × T0-4.07) The setting is made such that the presence or absence of the heating container 5 is determined. Thereby, even if the presence or absence of the heating container 5 is erroneously determined by the primary determination, it can be reliably determined whether the heating container 5 is introduced into the grill storage 2 according to the initial temperature T0. In addition, also in secondary determination, according to the difference of 2nd temperature difference (Tb-Ta), 2nd reference temperature difference Y2 by 2 or more types of linear expression or quadratic expression may be set similarly.

FIG. 8 is a flow chart showing a control program for determining the presence or absence of the heating container 5 when the container cooking mode is selected in the gas stove of the present embodiment.
First, when the automatic menu switch 381 receives the selection of the container cooking mode, the cooking selection switch 382 selects the type of cooking, the baking condition selection switch 383 selects the finish of the food, and the grill switch 37 is turned on. The upper and lower burners 56 and 55 are ignited, and combustion is started at a predetermined first judgment thermal power Pa (for example, both are strong thermal power) (steps ST1 to ST5).

  When combustion of upper and lower burners 56 and 55 is started, a timer is started, and initial temperature T0 is read (step ST6), and based on the cooking condition of selected container cooking mode and initial temperature T0, first judgment time ta Various set values such as the second judgment time tb, the first reference temperature difference Y1, the second reference temperature difference Y2 and the like are read (step ST7).

  Next, when the first determination time ta (for example, 5 minutes) elapses (Yes in step ST8), the first temperature difference (Ta-T0) between the internal temperature Ta and the initial temperature T0 at the first determination time ta And the first reference temperature difference Y1 corresponding to the initial temperature T0 are compared (step ST9).

  At this time, if the first temperature difference (Ta-T0) is equal to or less than the first reference temperature difference Y1 (Yes in step ST9), the upper and lower burners 56 and 55 are burned with the predetermined first judgment thermal power Pa Since it is difficult for the internal temperature to rise, it is determined that the heating container is "present" (step ST10), and the automatic cooking is continued according to the selected cooking condition (step ST11). On the other hand, if the first temperature difference (Ta-T0) exceeds the first reference temperature difference Y1 (No in step ST9), the internal temperature rises within a short time due to the combustion of the upper and lower burners 56 and 55. Therefore, it is determined that the heating container is "absent" (step ST12).

  If it is determined that the heating container is "absent" in the primary determination, the thermal power of the upper and lower burners 56, 55 is weakened to a predetermined second determination thermal power Pb (for example, the upper burner burns high, the lower burner extinguishes) (step ST13). Then, when the thermal power of the upper and lower burners 56, 55 is changed to the second determination thermal power Pb and a predetermined second determination time tb (for example, one minute) elapses after the first determination time ta (Yes in step ST14) The second temperature difference (Tb-Ta) between the internal temperature Tb at the second determination time tb and the internal temperature Ta at the first determination time ta, and the second reference temperature difference Y2 corresponding to the initial temperature T0 The comparison is made (step ST15).

  At this time, if the second temperature difference (Tb-Ta) exceeds the second reference temperature difference Y2 (Yes in step ST15), even if the heating power is weakened to the predetermined second judgment heating power Pb, Since the change is small, it is determined that the heating container is "present" (step ST10), and the automatic cooking is continued according to the selected cooking condition (step ST11). On the other hand, if the second temperature difference (Tb-Ta) is equal to or less than the second reference temperature difference Y2 (No in step ST15), the internal temperature largely changes by weakening the thermal power to the second judgment thermal power Pb. Since it is determined that the heating container is "absent" again, the upper and lower burners 56 and 55 are extinguished, and the automatic cooking is forcibly terminated, and the liquid crystal display unit 300 or a speaker (not shown) reports incorrect selection of the container cooking mode. (Steps ST16 to 18).

  As described above, according to the gas stove of the present embodiment, when the container cooking mode is selected, not only the primary determination in the initial heating stage but also the secondary determination in which the heating power is weakened after the primary determination is provided. It is possible to clarify the difference in temperature characteristics depending on the presence or absence of the heating container 5 in the storage 2. Thereby, the presence or absence of the heating container 5 can be determined reliably, without using the shielding board for preventing the influence of the combustion exhaust gas to the 1st temperature sensor 14a. Therefore, when the container cooking mode is selected by mistake, the automatic cooking can be properly stopped. Further, since the fixed support 19 without the shield plate can be used, damage to the ignition parts can be prevented when the heating container 5 is introduced into the grill storage 2, and the storage space when not in use can be reduced. Furthermore, even when the cooking in the container cooking mode is repeated, unnecessary stop of the automatic cooking due to the erroneous determination of the presence or absence of the heating container 5 can be prevented, and the automatic cooking can be smoothly continued.

(Other embodiments)
(1) In the above embodiment, the first judgment thermal power sets the upper and lower burners as strong thermal power, and the second judgment thermal power makes the upper flame burner as strong thermal power and extinguishes the lower flame burner, but the entire grill burner If it is the 2nd judgment thermal power which weakened 1st judgment thermal power as thermal power of 1, the thermal power of each burner can be selected suitably. For example, in the secondary determination, any of the upper and lower burners may have low power, or both of the upper and lower burners may be extinguished. However, when using a lower burner with higher capacity than the upper burner, if the lower burner is extinguished, the temperature difference between the inside temperature of the case using the grill and the case using the heating container should be increased. Can. Further, by burning the small-burning upper-fired burner, excessive reduction in the temperature inside the storage can be suppressed, and automatic cooking can be smoothly continued.
(2) In the above embodiment, although the first and second temperature differences are used as the first and second reference temperature characteristics, other temperature characteristics, for example, the temperature inside the chamber at the first and second determination times are used. The presence or absence of a heating container may be determined by the temperature gradient based on it.
(3) In the above embodiment, the heating cooker having both the grill net cooking mode and the container cooking mode as the automatic cooking mode has been described, but the present invention is also applied to a heating cooker having only the container cooking mode Can.

Reference Signs List 2 grill storage 5 heating container 14a first temperature sensor (internal temperature detection unit)
381 Auto Menu Switch (Cooking Mode Selection Unit)
55 lower flame burner 56 upper flame burner

Claims (4)

The grill storehouse,
Grill burners that heat the inside of the grill storage,
An internal temperature detection unit that detects the internal temperature of the grill storage;
A cooking mode selection unit capable of selecting a container cooking mode in which a heating container containing food is introduced into the grill storage to perform automatic cooking;
A heating cooker having a container determination unit that determines the presence or absence of a heating container based on the temperature in the storage detected by the temperature detection unit in the storage,
When the container cooking mode is selected in the cooking mode selection unit, the grill burner is burned at a predetermined first judgment thermal power for a predetermined first judgment time from the start of heating,
The first temperature characteristic based on the internal temperature detected by the internal temperature detection unit in the first determination time is compared with the first reference temperature characteristic for determining the presence or absence of the heating container in the grill storage, Primary judgment of the presence or absence of the heating container in the storage,
If it is determined that the heating container is “absent” in the primary determination, after the first determination time, the grill burner is burned at a predetermined second determination time, or at a predetermined second determination thermal power which is weaker than the first determination thermal power Let me extinguish,
The second temperature characteristic based on the internal temperature detected by the internal temperature detection unit at the second determination time is compared with a second reference temperature characteristic for determining the presence or absence of the heating container in the grill storage, The heating cooker provided with the control structure which makes a secondary determination of the presence or absence of the heating container in a store | warehouse | chamber. In the heating cooker according to claim 1,
A heating cooker in which the first reference temperature characteristic and the second reference temperature characteristic are set based on the temperature inside the storage at the start of heating. In the heating cooker according to claim 1 or 2,
As a grill burner, it has upper and lower burners,
In the primary judgment, both upper and lower burners are regarded as the first judgment thermal power of strong thermal power,
The heating cooker which makes the lower fire burner extinguish and makes it the 2nd judgment thermal power which weakened rather than the 1st judgment thermal power in secondary judgment. In the heating cooker according to any one of claims 1 to 3,
The heating cooker in which the second determination time is set to be shorter than the first determination time.

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