Gas stove

Abstract

To satisfactorily perform low temperature cooking even if a low temperature cooking mode is instructed immediately after a cooking container stored in a refrigerator is taken out of the refrigerator by first performing an initial heating operation for combusting a cooking stove burner for an initial heating time ts and initial fire power Qs which are set in such a manner that temperature of water in the cooking container is set to rise to a predetermined initial heating temperature which is set higher than a target heating temperature THa in the low temperature cooking mode and next performing a temperature adjusting operation for adjusting the fire power of the cooking stove burner in such a manner that a detected temperature TH of container temperature detection means becomes the target heating temperature THa, in low temperature cooking control in a gas cooking stove capable of performing the low temperature cooking.SOLUTION: Before performing an initial heating operation, it is discriminated whether or not the detected temperature TH of container temperature detection means is lower than an atmospheric temperature at a cooking oven installation place. When TH is lower than the atmospheric temperature, at least one of correcting the initial heating time ts longer and correcting the initial fire power Qs stronger is performed.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a gas stove including a stove burner that heats a cooking container placed on a hob on a stove top, a heating power adjusting means for adjusting the heating power of the stove burner, a container temperature detecting means for detecting the temperature of the cooking container placed on the hob, a control means, and a low-temperature cooking instruction means for instructing a low-temperature cooking mode in which an object to be cooked is heated at a temperature lower than 100°C in a certain amount of water placed in the cooking container.

Background Art

[0002] Conventionally, as this type of gas stove, for example, as disclosed in Patent Document 1, when a low-temperature cooking mode is instructed by a low-temperature cooking instruction means, a control means is configured to execute low-temperature cooking control. Here, in the low-temperature cooking control, the heating power of the stove burner is adjusted by the heating power adjusting means so that the detected temperature by the container temperature detecting means becomes the heating target temperature in the low-temperature cooking mode. In addition, in order to maintain the detected temperature by the container temperature detecting means at the heating target temperature in the low-temperature cooking mode, it is necessary to significantly reduce the generated heat amount of the stove burner. Therefore, in the device described in Patent Document 1, in the low-temperature cooking control, the stove burner is intermittently extinguished.

[0003] By the way, in the initial heating stage, since the temperature of the object to be cooked is lower than the temperature of the water in the cooking container, in order to heat the object to be cooked to the heating target temperature early, it is necessary to quickly raise the temperature of the water in the cooking container to a predetermined initial heating temperature set higher than the heating target temperature. Here, in the initial heating stage, since the temperature of the water in the cooking container does not match the temperature of the cooking container detected by the container temperature detection temperature, it is difficult to raise the temperature of the water in the cooking container to the initial heating temperature by control based on the detected temperature by the container temperature detecting means. Therefore, in the low-temperature cooking control, first, an initial heating operation is performed in which the stove burner is burned at an initial heating time and an initial heating power set so that the temperature of the water in the cooking container rises to the initial heating temperature, and then, it is desirable to perform a temperature control operation in which the heating power of the stove burner is adjusted by the heating power adjusting means so that the detected temperature by the container temperature detecting means becomes the heating target temperature in the low-temperature cooking mode.

[0004] However, some users may store the cooking container with water and the food to be cooked in the refrigerator, and immediately after taking the cooking container out of the refrigerator, they may instruct the low-temperature cooking mode using this cooking container. In this case, even if the initial heating operation is performed at the set initial heating time and initial heating power, the temperature of the water in the cooking container does not rise to the initial heating temperature, and the food to be cooked cannot be properly cooked at a low temperature due to insufficient initial heating.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In view of the above points, an object of the present invention is to provide a gas stove that can perform low-temperature cooking well even when the low-temperature cooking mode is instructed immediately after taking out a cooking container that has been stored in a refrigerator with water and the food to be cooked.

Means for Solving the Problems

[0007] In order to solve the above problems, the present invention provides a gas stove including a stove burner for heating a cooking container placed on a cooking grate on a stove top, a heating power adjustment means for adjusting the heating power of the stove burner, a container temperature detection means for detecting the temperature of the cooking container placed on the cooking grate, a control means, and a low-temperature cooking instruction means for instructing a low-temperature cooking mode in which an object to be cooked is heated at a temperature lower than 100°C in a certain amount of water placed in the cooking container. The control means is configured to execute low-temperature cooking control when the low-temperature cooking mode is instructed by the low-temperature cooking instruction means. In the low-temperature cooking control, first, an initial heating operation is performed in which the stove burner is burned at an initial heating time and an initial heating power set so that the temperature of the water in the cooking container rises to a predetermined initial heating temperature set higher than the heating target temperature in the low-temperature cooking mode. Next, a temperature adjustment operation is performed in which the heating power of the stove burner is adjusted by the heating power adjustment means so that the detected temperature of the container temperature detection means becomes the heating target temperature in the low-temperature cooking mode. In this case, the control means is configured to correct at least one of the initial heating time and the initial heating power based on the detected temperature of the container temperature detection means before performing the initial heating operation in the low-temperature cooking control.

[0008] According to the present invention, when the low-temperature cooking mode is instructed immediately after taking out the cooking container from the refrigerator, the detected temperature of the container temperature detection means before performing the initial heating operation decreases, and at least one of the initial heating time and the initial heating power is corrected. As a result, even when the low-temperature cooking mode is instructed immediately after taking out the cooking container from the refrigerator, it becomes possible to raise the temperature of the water in the cooking container to a temperature close to the initial heating temperature in the initial heating operation, and low-temperature cooking can be performed satisfactorily.

[0009] Furthermore, the temperature range that can be accurately detected by the container temperature detection means is not very wide, and it is difficult to accurately detect room temperature or lower temperatures with the container temperature detection means. Therefore, when the low-temperature cooking mode is instructed immediately after taking out the cooking container stored in the refrigerator with water and the food to be cooked, it is difficult to accurately detect the temperature of the cooking container that is lower than room temperature with the container temperature detection means. However, when the low-temperature cooking mode is instructed immediately after taking out the cooking container from the refrigerator, even if the temperature of the cooking container cannot be accurately detected by the container temperature detection means, the detected temperature of the container temperature detection means is lower than the ambient temperature of the gas stove installation location, which is the detected temperature before placing the cooking container on the stove.

[0010] Therefore, in the present invention, the control means determines whether or not the detected temperature of the container temperature detection means before performing the initial heating in the low-temperature cooking control is lower than the ambient temperature of the gas stove installation location, and when the detected temperature of the container temperature detection means has decreased, it is desirable to be configured to perform at least one of correcting the initial heating time to be longer and correcting the initial heating power to be stronger. According to this, when the low-temperature cooking mode is instructed immediately after taking out the cooking container from the refrigerator, at least one of correcting the initial heating time to be longer and correcting the initial heating power to be stronger will be performed. As a result, even when the low-temperature cooking mode is instructed immediately after taking out the cooking container from the refrigerator, it becomes possible to more accurately raise the temperature of the water in the cooking container to a temperature close to the initial heating temperature during the initial heating operation, and good low-temperature cooking can be performed.

[0011] In addition, in the present invention, the stove burner is preferably composed of a parent-child burner having a parent burner part and a child burner part whose maximum heating power is smaller than that of the parent burner part, and in the initial heating operation, both the parent burner part and the child burner part are burned, and in the temperature control operation, only the child burner part is burned. According to this, the heating power during the temperature control operation can be made much smaller than the heating power during the initial heating operation. Therefore, even if the ignition and extinguishing are not repeated during the temperature control operation, the detected temperature of the container temperature detection means can be maintained at the heating target temperature in the low-temperature cooking mode, and it is possible to suppress giving the user a sense of discomfort due to the repeated ignition and extinguishing.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0013] Referring to FIGS. 1 and 2, the gas stove according to the embodiment of the present invention includes a stove burner 2 whose upper part protrudes upward through a burner opening 11 formed in a stove top plate 1 that covers the upper surface of a stove body (not shown). The stove burner 2 is composed of a parent-child burner having a parent burner part 2a and a child burner part 2b whose maximum firepower is smaller than that of the parent burner part 2a. On the stove top plate 1, a trivet 12 is placed so as to surround the burner opening 11, and a covering 13 that covers the gap between the stove burner 2 and the burner opening 11 from above is placed.

[0014] Referring also to FIGS. 3 and 4, as a burner constituent member, the stove burner 2 has a burner body 21 whose upper part is inserted into the burner opening 11, and an annular burner head 22 placed on the burner body 21 and having a large number of flame ports 221 opening at circumferential intervals on the outer peripheral surface. And a majority part except a circumferential part of the burner body 21 and the burner head 22 constitutes the parent burner part 2a, and a circumferential part of the burner body 21 and the burner head 22 constitutes the child burner part 2b.

[0015] More specifically, an air distribution chamber 23a for the main burner is defined inside the circumferential portion that becomes the main burner portion 2a of the burner body 21, and a mixing pipe 24a for the main burner that extends outward from the central portion of the circumferential portion that becomes the main burner portion 2a of the burner body 21 and communicates with the air distribution chamber 23a for the main burner is provided. Then, by injecting fuel gas from the main burner nozzle 25a facing the inlet 241a at the upstream end of the mixing pipe 24a for the main burner, an air-fuel mixture (a mixed gas of fuel gas and primary air flowing in from the inlet 241a) is generated inside the mixing pipe 24a for the main burner, and this air-fuel mixture is ejected from the flame port 221 existing in the circumferential portion that becomes the main burner portion 2a of the burner head 22 through the air distribution chamber 23a for the main burner, so that combustion in the main burner portion 2a is carried out. Further, inside the circumferential portion that becomes the sub-burner portion 2b of the burner body 21, a sub-burner air distribution chamber 23b partitioned from the air distribution chamber 23a for the main burner by a partition wall 211 is defined, and a mixing pipe 24b for the sub-burner that communicates with the sub-burner air distribution chamber 23b is provided. Then, by injecting fuel gas from the sub-burner nozzle 25b facing the inlet 241b at the upstream end of the mixing pipe 24b for the sub-burner, an air-fuel mixture is generated inside the mixing pipe 24b for the sub-burner, and this air-fuel mixture is ejected from the flame port 221 existing in the circumferential portion that becomes the sub-burner portion 2b of the burner head 22 through the sub-burner air distribution chamber 23b, so that combustion in the sub-burner portion 2b is carried out.

[0016] Further, on the outer peripheral surface of the burner head 22, a target portion 222 is provided so as to protrude directly above a flame port 221 located at the center of a circumferential portion that matches the extending portion of the mixing pipe 24a for the main burner, and an ignition plug 3 is provided facing downward with respect to the target portion 222. Then, the cooking burner 2 is ignited by a spark discharge between the ignition plug 3 and the target portion 222. Incidentally, in the burner body 21, a partition wall portion 212 is provided at the center of a circumferential portion that matches the extending portion of the mixing pipe 24a for the main burner, and the communication portion between the mixing pipe 24a for the main burner and the distribution chamber 23a for the main burner is divided into two branches in the circumferential direction. Then, a through hole 212a penetrating in the vertical direction is formed in this partition wall portion 212, and the ignition plug 3 is inserted through this through hole 212a. On the burner head 22, an eaves portion 223 that protrudes upward is provided to prevent spillage onto the ignition plug 3.

[0017] Further, the cooking burner 2 is provided with a first flame detection element 41 composed of a thermocouple for detecting the flame of the main burner portion 2a and a second flame detection element 42 composed of a thermocouple for detecting the flame of the sub - burner portion 2b. Further, a pan bottom temperature sensor 5, which is a container temperature detection means for detecting the temperature of the cooking container by contacting the bottom surface of the cooking container placed on the stove 12, is provided. The pan bottom temperature sensor 5 is provided so as to protrude upward through the burner central space surrounded by the burner head 22.

[0018] Referring to FIG. 4, fuel gas is supplied to the parent burner nozzle 25a, i.e., the parent burner section 2a, via the parent burner gas supply passage 6a branched from the common gas supply passage 6, and to the child burner nozzle 25b, i.e., the child burner section 2b, via the child burner gas supply passage 6b branched from the common gas supply passage 6. A safety valve 61 and a flow rate control valve 62 are provided in the common gas supply passage 6, and an on-off solenoid valve 63 is provided in the parent burner gas supply passage 6a. In this case, a combustion power control means for controlling the combustion power of the stove burner 2 is constituted by the flow rate control valve 62 and the on-off solenoid valve 63. With the on-off solenoid valve 63 closed and combustion occurring only in the child burner section 2b, the flow rate control valve 62 can change the combustion power of the stove burner 2 between the minimum "1" and the next "2", and further, with the on-off solenoid valve 63 open and combustion occurring in both the child burner section 2b and the parent burner section 2a, the flow rate control valve 62 can change the combustion power of the stove burner 2 from "3" to the maximum "11".

[0019] An igniter (not shown) that applies a high voltage to the above-described safety valve 61, flow rate control valve 62, on-off solenoid valve 63, and ignition plug 3 is controlled by a controller 7 composed of a microcomputer as a control means. Signals from a point-fire extinguish operation section 81, a combustion power control operation section 82, and a cooking mode selection section 83 provided on an operation panel (not shown), signals from both the first and second flame detection elements 41, 42, and a signal from the bottom temperature sensor 5 of the pot are input to the controller 7. When an ignition command signal is input from the point-fire extinguish operation section 81, the controller 7 performs ignition control to open the safety valve 61 and the on-off solenoid valve 63 and turn on the igniter to ignite the stove burner 2. Thereafter, when misfire is detected based on the signals from both the first and second flame detection elements 41, 42, or when a fire extinguish command signal is input from the point-fire extinguish operation section 81, the controller 7 performs fire extinguish control to close the safety valve 61.

[0020] Here, in the cooking mode selection unit 83, as one of the automatic cooking modes, it is possible to select a low-temperature cooking mode in which the object to be cooked in the sealed bag is heated at a temperature lower than 100°C in a certain amount of water placed in the cooking container. Therefore, the cooking mode selection unit 83 also functions as a low-temperature cooking instruction means for instructing the low-temperature cooking mode. When the controller 7 is instructed of the low-temperature cooking mode by a signal from the cooking mode selection unit 83, it executes low-temperature cooking control. In the low-temperature cooking control, first, a predetermined initial heating time Yts (for example, 5 minutes) and a predetermined initial heating power YQs (for example, heating power "6") are set so that the temperature of the water in the cooking container rises to a predetermined initial heating temperature THs (for example, 80°C) higher than the heating target temperature THa (for example, 63°C) in the low-temperature cooking mode, and an initial heating operation is performed by burning both the parent burner unit 2a and the child burner unit 2b. Next, a temperature control operation is performed in which the flow rate control valve 62 adjusts the heating power so that the detected temperature TH of the bottom temperature sensor 5 becomes the heating target temperature THa in the low-temperature cooking mode with only the child burner unit 2b burning. In this case, if the temperature of the water in the cooking container is normal temperature (for example, 25°C) before the initial heating operation is performed, the temperature of the water in the cooking container changes as shown by line a in FIG. 6.

[0021] However, when the cooking container in which water and the object to be cooked were stored in the refrigerator is taken out of the refrigerator and the low-temperature cooking mode is immediately instructed, even if the initial heating operation is performed with the predetermined initial heating time Yts and the predetermined initial heating power YQs, the temperature of the water in the cooking container does not rise to the initial heating temperature THs, and the object to be cooked cannot be properly cooked at a low temperature due to insufficient initial heating. Therefore, in the present embodiment, before performing the initial heating operation in the low-temperature cooking control, it is determined whether or not the detected temperature TH of the bottom temperature sensor 5 has dropped below the ambient temperature at the installation location of the gas stove. When the detected temperature TH of the bottom temperature sensor 5 has dropped below the ambient temperature at the installation location of the gas stove, the initial heating time ts is corrected to be longer.

[0022] Hereinafter, with reference to FIG. 5, the details of the low-temperature cooking control will be described. In the low-temperature cooking control, first, in STEP1, it is determined whether the detected temperature TH of the bottom temperature sensor 5 of the pan has dropped below the ambient temperature at the installation location of the gas stove. Specifically, the detected temperature TH of the bottom temperature sensor 5 before placing the cooking container on the trivet 12 is used as the ambient temperature at the installation location of the gas stove, and it is determined whether the detected temperature TH of the bottom temperature sensor 5 has dropped after placing the cooking container on the trivet 12. More specifically, when the decrease gradient of the detected temperature TH of the bottom temperature sensor 5 within a predetermined time (for example, about 3 seconds) after placing the cooking container on the trivet 12 is equal to or greater than a predetermined gradient, it is determined that the detected temperature TH of the bottom temperature sensor 5 has dropped below the ambient temperature at the installation location of the gas stove. Note that if not much time has elapsed since the burner 2 of the stove was previously used and the bottom temperature sensor 5 attached to this burner 2 has not been cooled to the ambient temperature at the installation location of the stove, the detected temperature TH of the bottom temperature sensor 5 will drop even when a normal-temperature cooking container is placed on the trivet 12. Therefore, in this case, the detected temperature of the bottom temperature sensor attached to another unused burner of the stove is used as the ambient temperature at the installation location of the gas stove, and the detected temperature of this bottom temperature sensor is compared with the detected temperature TH of the bottom temperature sensor 5 attached to the burner 2 that has been instructed to operate in the low-temperature cooking mode, and the determination process in STEP1 is performed.

[0023] When it is determined in STEP1 that the detected temperature TH of the bottom temperature sensor 5 has not dropped below the ambient temperature at the installation location of the gas stove, the process proceeds to STEP2, and the initial heating time ts and the initial heating power Qs used for control are set to a predetermined initial heating time Yts and a predetermined initial heating power YQs. On the other hand, when it is determined in STEP1 that the detected temperature TH of the bottom temperature sensor 5 has dropped below the ambient temperature at the installation location of the gas stove, the process proceeds to STEP3, and the initial heating power Qs used for control is set to the predetermined initial heating power YQs, but the initial heating time ts used for control is set to a time (for example, 7 minutes) that is longer than the predetermined initial heating time Yts by a predetermined time Δt.

[0024] When the processing in STEP2 or STEP3 is completed, proceed to STEP4 to determine whether an ignition command signal has been input from the ignition and extinguishing operation unit 81. If the ignition command signal is input, perform ignition control in STEP5. Next, in STEP6, determine whether a flame has been detected by both the first and second flame detection elements 41 and 42. If no flame is detected, determine whether a predetermined waiting time has elapsed since the start of the ignition control in STEP7. When the waiting time has elapsed without a flame being detected, proceed to STEP14 to perform extinguishing control.

[0025] When it is determined in STEP6 that a flame has been detected, proceed to STEP8 to start the initial heating operation. In this initial heating operation, both the parent burner section 2a and the child burner section 2b are burned, and the heating power Q of the stove burner 2 is set to the initial heating power Qs. Next, proceed to STEP9 to determine whether an extinguishing command signal has been input from the ignition and extinguishing operation unit 81. When the extinguishing command signal is input, proceed to STEP14 to perform extinguishing control. If the extinguishing command signal is not input, proceed to STEP10 to determine whether the initial heating time ts has elapsed since the start of the initial heating operation, and repeat returning from STEP10 to STEP8 until the initial heating time ts has elapsed.

[0026] When the initial heating time ts has elapsed since the start of the initial heating operation, proceed to STEP11 to start the temperature control operation. In this temperature control operation, only the sub-burner unit 2b is burned, and the flow control valve 62 adjusts the heating power of the stove burner 2, that is, the heating power of the sub-burner unit 2b, so that the detected temperature TH of the pot bottom temperature sensor 5 becomes the heating target temperature THa in the low-temperature cooking mode. Incidentally, in a normal stove burner without a sub-burner unit 2b, since the minimum heating power cannot be made much smaller in order to prevent misfire, it is necessary to intermittently extinguish the stove burner to lower the detected temperature TH of the pot bottom temperature sensor 5 to the heating target temperature THa in the low-temperature cooking mode. As a result, the ignition and extinguishing of the stove burner will be repeated, which will give the user a sense of discomfort. On the contrary, in this embodiment, by burning only the sub-burner unit 2b during the temperature control operation, the heating power during the temperature control operation can be made considerably smaller. Therefore, even if the ignition and extinguishing are not repeated during the temperature control operation, the detected temperature TH of the pot bottom temperature sensor 5 can be maintained at the heating target temperature THa in the low-temperature cooking mode, and the repetition of the ignition and extinguishing can be suppressed from giving the user a sense of discomfort.

[0027] When starting the temperature control operation, next, proceed to STEP12 to determine whether a fire extinguishing command signal has been input from the ignition and extinguishing operation unit 81. When a fire extinguishing command signal has been input, proceed to STEP14 to perform fire extinguishing control. If a fire extinguishing command signal is not input, proceed to STEP13 to determine whether the set cooking time in the low-temperature cooking mode has elapsed since the start of the initial heating operation. Until the set cooking time has elapsed, repeat returning from STEP13 to STEP11. When the set cooking time has elapsed, proceed to STEP14 to perform fire extinguishing control.

[0028] If the above low-temperature cooking control is performed, when the cooking container stored in the refrigerator with water and the object to be cooked is taken out of the refrigerator and the low-temperature cooking mode is immediately instructed, since the detected temperature TH of the bottom temperature sensor 5 of the pan drops below the ambient temperature at the installation location of the gas stove, the initial heating operation with the initial heating time ts obtained by adding a predetermined time Δt to the predetermined initial heating time Yts will be performed. Therefore, it becomes possible to raise the temperature of the water in the cooking container to a temperature close to the initial heating temperature THs as shown by the b line in FIG. 6 during the initial heating operation, and low-temperature cooking can be performed well.

[0029] As described above, the embodiments of the present invention have been described with reference to the drawings, but the present invention is not limited thereto. For example, in STEP3 of FIG. 5, the initial heating time ts used for control may be set to a predetermined initial heating time Yts, and the initial heating power Qs used for control may be set to a heating power stronger than the predetermined initial heating power YQs (for example, heating power "8"). Furthermore, the initial heating time ts used for control may be set longer than the predetermined initial heating time Yts, and the initial heating power Qs used for control may be set stronger than the predetermined initial heating power. In addition, if the bottom temperature sensor 5 can accurately detect normal temperature or a temperature lower than that, at least one of the initial heating time ts used for control and the initial heating power Qs used for control may be corrected according to the difference between the detected temperature of the bottom temperature sensor 5 before the initial heating operation in the low-temperature cooking control and a predetermined reference temperature.

[0030] In addition, the time and heat power required to raise the temperature of the water in the cooking container to the initial heating temperature THs (for example, 80°C) also vary depending on the gas pressure and the air temperature. Therefore, the predetermined initial heating time Yts and the predetermined initial heat power YQs may be set and changed according to the gas pressure and the air temperature. Further, in the above embodiment, the container temperature detection means is constituted by the bottom temperature sensor 5 that abuts on the bottom surface of the cooking container. However, it is also possible to constitute the container temperature detection means by an infrared temperature sensor that detects the temperature of the cooking container in a non-contact manner. Also, in the above embodiment, the stove burner 2 is constituted by a parent-child burner having a part of the circumferential direction as the child burner part 2b and most of the circumferential direction other than the child burner part 2b as the parent burner part 2a. However, it is also possible to constitute the stove burner by a parent-child burner having a parent burner part configured to eject the air-fuel mixture from the large upper flame port of the two upper and lower flame ports opening on the outer peripheral surface of the burner head and a child burner part configured to eject the air-fuel mixture from the small lower flame port.

Explanation of Signs

[0031] 1... Stove top plate, 12... Grid, 2... Stove burner, 2a... Parent burner part, 2b... Child burner part, 5... Bottom temperature sensor (container temperature detection means), 62... Flow rate control valve (heat power control means), 63... On-off solenoid valve (heat power control means), 7... Controller (control means), 83... Cooking mode selection unit (low-temperature cooking instruction means), TH... Detection temperature of the bottom temperature sensor, THa... Heating target temperature in the low-temperature cooking mode, THs... Initial heating temperature, ts... Initial heating time, Qs... Initial heat power.

Claims

1. A gas stove comprising: a stove burner for heating a cooking container placed on a cooking grate on a stove top; a heat control means for adjusting the heating power of the stove burner; a container temperature detection means for detecting the temperature of the cooking container placed on the cooking grate; a control means; and a low-temperature cooking instruction means for instructing a low-temperature cooking mode in which an object to be cooked is heated at a temperature lower than 100°C in a certain amount of water placed in the cooking container. When the low-temperature cooking mode is instructed by the low-temperature cooking instruction means, the control means is configured to execute low-temperature cooking control. In the low-temperature cooking control, first, an initial heating operation is performed in which the stove burner is burned at an initial heating time and an initial heating power set so that the temperature of the water in the cooking container rises to a predetermined initial heating temperature set higher than the heating target temperature in the low-temperature cooking mode. Next, a temperature control operation is performed in which the heating power of the stove burner is adjusted by the heat control means so that the detected temperature by the container temperature detection means becomes the heating target temperature in the low-temperature cooking mode. The control means is configured to correct at least one of the initial heating time and the initial heating power based on the detected temperature by the container temperature detection means before performing the initial heating operation in the low-temperature cooking control. The control means is configured to determine whether the detected temperature by the container temperature detection means before performing the initial heating in the low-temperature cooking control is lower than the ambient temperature of the installation location of the gas stove. When the detected temperature by the container temperature detection means is lower, the gas stove according to claim 1 is configured to perform at least one of correcting the initial heating time to be longer and correcting the initial heating power to be stronger. The stove burner is composed of a parent-child burner having a parent burner part and a child burner part with a maximum heating power smaller than that of the parent burner part. In the initial heating operation, both the parent burner part and the child burner part are burned, and in the temperature control operation, only the child burner part is burned. The gas stove according to claim 1 is characterized in that.

2. The control means is configured to determine whether the detected temperature by the container temperature detection means before performing the initial heating in the low-temperature cooking control is lower than the ambient temperature of the installation location of the gas stove. When the detected temperature by the container temperature detection means is lower, the gas stove according to claim 1 is configured to perform at least one of correcting the initial heating time to be longer and correcting the initial heating power to be stronger.

3. The stove burner is composed of a parent-child burner having a parent burner part and a child burner part with a maximum heating power smaller than that of the parent burner part. In the initial heating operation, both the parent burner part and the child burner part are burned, and in the temperature control operation, only the child burner part is burned. The gas stove according to claim 1 is characterized in that.

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