JP6572034B2 - Gas stove - Google Patents

Description

  The present invention relates to a gas stove.

  Conventionally provided gas stoves have a function of maintaining the cooking temperature in a certain temperature range. For example, the gas stove disclosed in Patent Document 1 is set to a predetermined cooking mode in accordance with the operation by the user. In this mode, after the burner is ignited, the heating power is weakened when the detected temperature rises to a certain temperature, When it falls to a certain temperature, the thermal power is strengthened. Such heating power switching is repeated to keep the cooking temperature within a certain range.

JP 2014-55724 A

  By the way, since the gas stove cannot directly detect the temperature of the contents being cooked, when temperature control is performed, a method for estimating the temperature of the contents from the temperature of the cooking container must be employed. For example, when it is desired to weaken the thermal power when the contents reach a predetermined temperature, a method for weakening the thermal power when the cooking container reaches a predetermined upper limit temperature (a temperature at which the contents are estimated to have risen to the predetermined temperature). If it uses, the excessive temperature rise of the contents can be suppressed. Alternatively, when it is desired to increase the heating power when the contents reach a predetermined temperature, a method of reducing the heating power when the cooking container reaches a predetermined lower limit temperature (a temperature at which the contents are estimated to have dropped to the predetermined temperature). If it uses, it can suppress that the temperature of the content falls too much.

  However, when estimating the temperature of the contents from the temperature of the cooking container, there is a problem that the relationship between the temperature of the cooking container and the temperature of the contents can vary depending on the material of the cooking container. For example, when the material of the cooking container is a material having a high thermal conductivity, the followability of the temperature of the cooking container with respect to the temperature of the contents is good, and the difference between the temperature of the cooking container and the temperature of the contents becomes small. Conversely, when the material of the cooking container is a material having a low thermal conductivity, the followability of the temperature of the cooking container with respect to the temperature of the contents is poor, and the difference between the temperature of the cooking container and the temperature of the contents becomes large. Thus, since the relationship between the temperature of the cooking container and the temperature of the contents varies depending on the material of the cooking container, it is difficult to estimate the exact temperature of the contents from the temperature of the cooking container. For this reason, simply switching the heating power by estimating the temperature of the contents from the temperature of the cooking container tends to cause a deviation from the timing at which switching should be performed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a gas stove that can set the temperature at which the heating power is switched according to the material of the cooking container.

The gas stove of the present invention is
A gas burner for burning the combustion gas and heating the cooking vessel;
A container temperature detector for detecting the temperature of the cooking container;
A mode setting unit for setting the control mode of the gas burner to at least a predetermined cooking mode;
When the predetermined cooking mode is set by the mode setting unit, when the temperature detected by the container temperature detection unit reaches a predetermined first temperature when the gas burner is in a predetermined first heating power state. The gas burner is switched to the second thermal power state in which the thermal power is less than that in the first thermal power state, and after the switching to the second thermal power state, the temperature detected by the container temperature detection unit is a predetermined second temperature. A control unit that performs switching control between the first thermal power state and the second thermal power state so as to switch the gas burner to the first thermal power state,
Based on the temperature detection result by the container temperature detection unit in a state where the cooking container is heated by the gas burner, an equilibrium state is occurring in which the contents in the cooking container are boiling in the cooking container. An equilibrium temperature detector for detecting the equilibrium temperature;
When the equilibrium temperature detected by the equilibrium temperature detector is equal to or higher than the first threshold and the second threshold, the first temperature and the second temperature used in the predetermined cooking mode are increased as the equilibrium temperature increases. The difference between the first temperature and the second temperature is increased by increasing and decreasing the increase degree of the second temperature than the increase degree of the first temperature, and the equilibrium temperature is less than the first threshold value. In some cases, the first temperature is set to a first fixed value that is smaller than the first threshold value, and when the equilibrium temperature is less than the second threshold value, the second temperature is set to a first value that is smaller than the first fixed value. A switching temperature determination unit that determines the first temperature and the second temperature in a determination method of 2 fixed values ;
Have

And if the equilibrium temperature at which the equilibrium state occurs in the cooking vessel is relatively large, relatively poor follow-up of the temperature of the cooking container with respect to the temperature of the contents, the temperature and the contents of the cooking vessel This is a case where the difference from the temperature becomes large. In such a case, since it takes time until the temperature of the cooking container reaches the equilibrium state after the temperature of the content reaches the equilibrium state, if the first temperature is set low, the temperature of the content is sufficiently high. It becomes easy to happen that the firepower is weakened when it is not increased. On the contrary, the case where the equilibrium temperature is relatively small is that the temperature of the cooking container is relatively good following the temperature of the contents, and the difference between the temperature of the cooking container and the temperature of the contents is small. is there. In such a case, since it takes a short time until the temperature of the cooking container reaches the equilibrium state after the temperature of the content reaches the equilibrium state, if the first temperature is set high, the temperature of the content is sufficiently high. Although it is increasing, there is a tendency for the firepower to be maintained for a long time without being switched. On the other hand, in this invention, since 1st temperature is set large, so that equilibrium temperature becomes large, after the temperature of the content is raised more, it will switch to 2nd thermal power state. Therefore, it is difficult to cause a situation where the heating power is weakened when the temperature of the contents is not sufficiently increased. On the contrary, since the first temperature is set to be smaller as the equilibrium temperature becomes smaller, it is difficult to cause a situation where the temperature of the contents is sufficiently increased and the thermal power is not switched for a long time without being switched. Become.

When the equilibrium temperature is relatively large when a predetermined equilibrium state occurs in the cooking container, the followability of the temperature of the cooking container with respect to the temperature of the contents is relatively poor, and the temperature of the cooking container and the contents This is a case where the difference from the temperature becomes large. In such a case, if the second temperature is too low, the temperature of the contents tends to be too low when the detected temperature reaches the second temperature, and the temperature is easily maintained in a state where heating is insufficient. Become. On the contrary, the case where the equilibrium temperature is relatively small is that the temperature of the cooking container is relatively good following the temperature of the contents, and the difference between the temperature of the cooking container and the temperature of the contents is small. is there. In such a case, if the second temperature is set to be high, a situation in which the temperature of the contents is not sufficiently lowered is likely to be switched to a strong heating power, and the temperature is easily maintained in an excessively heated state. Become. On the other hand, in this invention, since 2nd temperature is set so large that equilibrium temperature becomes large, it becomes easy to switch to a 1st thermal power state, before the temperature of the content becomes low too much. Therefore, it becomes easy to avoid the situation where temperature is maintained in a state where heating is insufficient. On the contrary, since the second temperature is set to be smaller as the equilibrium temperature becomes smaller, it becomes easier to switch to the first thermal power state after the temperature of the contents is appropriately lowered. Therefore, it becomes easy to avoid the situation where the temperature is maintained in an excessively heated state.

In the present invention, the switching temperature determination unit determines the relationship between the first temperature and the second temperature so that the difference between the first temperature and the second temperature increases as the equilibrium temperature detected by the equilibrium temperature detection unit increases. It may be a configuration.

  When the equilibrium temperature is relatively small, the followability of the temperature of the cooking container with respect to the temperature of the contents is relatively good. In such a case, if the difference between the first temperature and the second temperature is reduced, the contents Highly accurate temperature control is possible to keep the temperature of the object within a narrow temperature range.

  On the contrary, when the equilibrium temperature is relatively large and the temperature of the cooking container is relatively poor following the temperature of the contents, the temperature of the contents is likely to vary, so the difference between the first temperature and the second temperature is calculated. If the temperature is reduced and controlled with a narrow temperature range, the temperature of the contents tends to deviate from the target temperature range. For example, even if the temperature of the cooking container reaches the second temperature, there is a tendency that the temperature of the contents does not decrease so much, and there may be a case where the heating power is switched to a strong heating power while the temperature of the contents is high. . On the other hand, if the difference between the first temperature and the second temperature is increased when the equilibrium temperature is relatively large, it becomes easier to cope with the characteristics when the followability is poor (the temperature variation of the contents).

FIG. 1 is a perspective view illustrating the appearance of the gas stove according to the first embodiment. FIG. 2 is a block diagram illustrating the electrical configuration of the gas stove according to the first embodiment. FIG. 3 is an explanatory diagram simply showing the configuration of the gas flow path leading to the gas burner. FIG. 4 is a state transition diagram of the gas stove according to the first embodiment.

<Example 1>
Hereinafter, a gas stove 1 embodying an example of the present invention will be described with reference to the drawings. These drawings are used to explain technical features that can be adopted by the present invention. The structure of the apparatus described below is merely an illustrative example, and is not intended to be limited to that unless otherwise specified.

  As shown in FIG. 1, a top plate 2 is provided on the top surface of the gas stove 1. Openings are formed on the left and right sides of the top plate 2, a gas burner 5 is provided inside the right opening, and a gas burner 6 is provided inside the left opening. Five virtues 11 and 12 are respectively provided at the upper portions of the respective openings. A cooking pot (not shown) or the like is placed on each of the upper parts of the virtues 11 and 12. A sensor unit 15 is provided at the center of the gas burner 5, and a sensor unit 16 is provided at the center of the gas burner 6.

  The sensor portions 15 and 16 can be moved up and down and are urged upward by a spring (not shown). The sensor parts 15 and 16 are pushed down when the cooking pot is placed on the virtues 11 and 12. The sensor unit 15 includes the thermistor 7 and the pan mounting sensor 53 shown in FIG. The sensor unit 16 includes the thermistor 8 and the pan mounting sensor 54 shown in FIG. The thermistors 7 and 8 detect the pan bottom temperature by contacting the pan bottoms of the cooking pans placed on the virtues 11 and 12. In addition, the temperature of the to-be-cooked object in a cooking pan cannot be detected directly. Therefore, the gas stove 1 estimates the temperature of the cooking object in the cooking pan by detecting the pan bottom temperature. The pan mounting sensors 53 and 54 include micro switches (not shown) and the like. The microswitch is turned on by being pushed down by the pan bottom. By using such a property, the gas stove 1 can identify whether or not the cooking pan is placed on the five virtues 11 and 12.

  As shown in FIG. 2, a grill door 17, ignition switches 21 to 23, fire power adjustment levers 25 to 27, and the like are provided on the front surface of the gas stove 1. A grill exhaust port (not shown) is provided behind the top plate 2. The grill exhaust port is an opening for exhausting the inside of the grill cabinet, and the grill exhaust port is provided with an exhaust hole cover 13 having a plurality of exhaust holes 13A.

  The ignition switch 21 is provided on the left side of the grill door 17. The ignition switch 21 performs an ignition operation of the gas burner 6. The ignition switch 22 is provided on the right side of the grill door 17. The ignition switch 22 performs an ignition operation of the gas burner 5. The ignition switch 23 is provided on the right end side of the front surface of the gas stove 1. The ignition switch 23 performs an ignition operation of the grill burner. The thermal power adjustment lever 25 is provided above the ignition switch 21. The thermal power adjustment lever 25 adjusts the thermal power of the gas burner 6. The thermal power adjustment lever 26 is provided above the ignition switch 22. The thermal power adjustment lever 26 adjusts the thermal power of the gas burner 5. The thermal power adjustment lever 27 is provided on the upper side of the ignition switch 23. The thermal power adjustment lever 27 adjusts the thermal power of the grill burner.

  As shown in FIG. 2, the gas burner 5, the gas burner 6, and the grill burner are provided with igniters 35 to 37, respectively. The igniters 35 to 37 are devices that ignite various burners by discharging sparks in conjunction with the ignition operations of the ignition switches 21 to 23, respectively. The gas stove 1 includes a first gas supply pipe 10 (see FIG. 3), a second gas supply pipe (not shown), and a third gas supply pipe (not shown). The first gas supply pipe 10 is a pipe for supplying gas to the gas burner 6. The second gas supply pipe is a pipe for supplying gas to the gas burner 5. The third gas supply pipe is a pipe for supplying gas to the grill burner.

  The electrical configuration of the gas stove 1 will be described with reference to FIG. The gas stove 1 includes a control circuit 70. In addition to the CPU 71, ROM 72, RAM 73, and flash memory 74, the control circuit 70 includes a timer, a grill timer, an I / O interface, and the like (not shown). The timer and grill timer operate by program. The CPU 71 performs overall control of various operations of the gas stove 1. The ROM 72 stores a “boiled food cooking program” in addition to various control programs of the gas stove 1. The boiled food cooking program is for executing a boiled food cooking process (see FIG. 4) described later.

  The control circuit 70 includes a power supply circuit 41, a switch input circuit 42, a thermistor input circuit 43, an operation panel input circuit 44, an igniter circuit 45, a safety valve circuit 46, a solenoid valve circuit 47, a sensor input circuit 48, a buzzer circuit 49, and a voice synthesizer. A circuit 50 and the like are connected to each other. The power supply circuit 41 has a function of receiving a power supply from two dry batteries mounted on the battery box and generating a DC power supply to be applied to various circuits. The switch input circuit 42 detects pressing of the ignition switches 21 to 23 and the mode selection switch 81, respectively. The operation panel input circuit 44 inputs various operations on the operation panel 30. The igniter circuit 45 drives igniters 35 to 37 of various burners. The safety valve circuit 46 opens and closes each safety valve 38-40. The electromagnetic valve circuit 47 opens and closes the electromagnetic valves 61 and 64. The sensor input circuit 48 is connected to pan mounting sensors 53 and 54, respectively. The sensor input circuit 48 inputs detection signals of the pan mounting sensors 53 and 54. A piezoelectric buzzer 55 is connected to the buzzer circuit 49. The buzzer circuit 49 drives the piezoelectric buzzer 55. The voice synthesizing circuit 50 synthesizes a voice guide voice output from the speaker 56.

  With reference to FIG. 3, the thermal power adjustment of the gas burner 6 will be described. The first gas supply pipe 10 includes a bypass pipe 85. One end of the bypass pipe 85 on the upstream side where the gas flows is connected to the branch part 33 of the first gas supply pipe 10, and the other end is connected to the merging part 34 of the first gas supply pipe 10. The safety valve 38 is provided in front of the branch portion 33 of the first gas supply pipe 10.

  The electromagnetic valve 61 is provided between the branch portion 33 and the junction portion 34 of the first gas supply pipe 10. The electromagnetic valve 61 is a gas flow rate adjusting keep solenoid valve. In such a gas burner 6, by opening and closing the electromagnetic valve 61, the gas flow rate flowing through the gas burner 6 can be adjusted in two stages, a first flow rate and a second flow rate. The first flow rate corresponds to low thermal power, and the second flow rate corresponds to high thermal power. Thereby, about the gas burner 6, the thermal power when the thermal-power adjustment lever 25 (refer FIG. 1) is adjusted to the maximum can be controlled in two steps, weak thermal power and strong thermal power.

  Similarly to the first gas supply pipe 10, the second gas supply pipe for the gas burner 5 is provided with a bypass pipe (not shown), a safety valve 39 (see FIG. 2), and an electromagnetic valve 64 (see FIG. 2). It has been. Therefore, also in the gas burner 5, the flow rate of the gas flowing through the gas burner 5 can be adjusted in two stages by opening and closing the electromagnetic valve 64 related to the adjustment of the gas flow rate. The third gas supply pipe for the grill burner is provided with a safety valve 40 and the like.

  Next, the cooking mode of the gas stove 1 will be described. In the gas stove 1, a plurality of types of cooking modes can be set in the gas burner 6. The plurality of types of cooking modes include at least a “normal mode” and a “boiled food cooking mode”. The “boiled food cooking mode” is a mode in which the temperature control described later with reference to FIG. 4 is performed, and the “normal mode” is a mode in which such temperature control is not performed.

  The “boiled food cooking mode” is, for example, a mode that is executed when a predetermined operation is performed on the mode selection switch 81. Like a boiled food, the temperature in the cooking container is set to a predetermined value near the boiling temperature of water. This mode is suitable for cooking that is desired to be maintained in range.

  Here, with reference to FIG. 4 etc., the cooking process in the boiled food cooking mode is demonstrated. In addition, here, it is referred to as a boiled food cooking mode for convenience, but as long as the mode has the same purpose, the name of the mode is not limited to the boiled food, and another name may be used. Moreover, although the example in which the cooking process in the cooking mode is performed in the gas burner 6 below, the same process may be performed in the gas burner 5.

  As shown in FIG. 4, the gas stove 1 is in the “normally stopped state” indicated by the block of S <b> 0 when none of the burners is ignited.

  When the ignition switch 21 is operated in the “normal stop state” indicated by the block of S0, the state becomes the “hot water amount determination state” indicated by the block of S1. At this time, a predetermined hot water amount determination process is performed, and the thermal power of the gas burner 6 is, for example, strong thermal power (first thermal power state). Note that the heating power in the “hot water amount determination state” varies depending on various controls, and is not particularly limited to strong heating power. In the “hot water amount determination state”, the boiled LED 90 shown in FIG. 1 is turned off. The boiled food LED 90 is a display unit indicating whether or not the boiled food cooking mode is set.

  In the “hot water amount determination state” indicated by the block of S1, the cooking mode is set to “boiled food cooking mode” by performing a predetermined operation on the mode selection switch 81. In such a “boiled food cooking mode”, the boiled food LED 90 is turned on. The detected temperature Th set in the “boiled food cooking mode” in the “hot water amount determination state” of S1 and indicated by the thermistor 8 is less than the first threshold temperature which is higher than the boiling temperature of water at 1 atm. When the temperature is equal to or higher than a second threshold temperature that is lower than the boiling temperature of water at atmospheric pressure and higher than a second fixed value described later, the counting of the measurement time T1 is started and the process proceeds to the “boiling standby state” indicated by the block of S2. To do. The first threshold temperature can be set to 130 ° C., for example, and the second threshold temperature can be set to 98 ° C., for example. In this case, when 130 ° C.> Th ≧ 98 ° C., the counting of the measurement time T1 is started, and a transition is made to the “boiling standby state” indicated by the block of S2. In this “boiling standby state”, the boiled LED 90 shown in FIG. 1 is turned on. The heating power of the gas burner 6 in the “boiling standby state” is a strong heating power (first heating power state). At this time, the electromagnetic valve 61 shown in FIG. 3 is opened. The measurement time T1 is a timer provided when boiling cannot be detected due to a disturbance such as wind.

  The “boiled food cooking mode” corresponds to an example of a “predetermined cooking mode”, and the control circuit 70 corresponds to an example of a mode setting unit that sets the control mode of the gas burner 6 to at least a predetermined cooking mode. The thermistor 8 corresponds to an example of a container temperature detection unit that detects the temperature of the cooking container.

  In the “boiling standby state” indicated by the block of S2, “boiling detection has been made” “measurement time T1 has reached the first threshold time (for example, 300 seconds)” “detected temperature Th in the thermistor 8 is When any of the conditions of “reaching the limit temperature (for example, 140 ° C.)” is satisfied, a predetermined sound is emitted from the piezoelectric buzzer 55 and the measurement time T2 is started, and the “boiled (low heat) state indicated by the block of S3” ”. In the “boiled (low heat) state” of S3, the heat power of the gas burner 6 is low heat power (second heat power state). At this time, the electromagnetic valve 61 shown in FIG. 3 is closed. The measurement time T2 is a timer for preventing the thermal power from switching frequently.

  In this configuration, the control circuit 70 corresponds to an example of a control unit, and when the mode setting unit is set to a predetermined cooking mode (boiled food cooking mode), the thermistor 8 is used when the gas burner 6 is in a predetermined first heating power state. When the temperature detected by the (container temperature detection unit) reaches a predetermined upper limit temperature Tha, the gas burner 6 is switched to the second thermal power state in which the thermal power is suppressed from the first thermal power state, and switched to the second thermal power state. After that, when the temperature detected by the thermistor 8 (container temperature detection unit) reaches a predetermined lower limit temperature Thb, the first thermal power state and the second thermal power are set so that the gas burner 6 is switched to the first thermal power state. Switching control with the state is performed. The upper limit temperature Tha corresponds to an example of a first temperature. The upper limit temperature Thb corresponds to an example of a second temperature.

  The control circuit corresponds to an example of an equilibrium temperature detection unit, and is based on a temperature detection result by the thermistor 8 (container temperature detection unit) in a state where the cooking container is heated by the gas burner 6. Detect the equilibrium temperature when the condition is occurring. This “predetermined equilibrium state” is, for example, a state where the contents in the cooking vessel are boiling, and in this configuration, the temperature detected by the thermistor 8 is constant temperature over a predetermined “boiling detection determination time”. A state within a difference (for example, 5 ° C.) is defined as a “predetermined equilibrium state”. The “boiling detection determination time” may be a fixed time or may be changed according to conditions. The temperature at the “predetermined equilibrium state” is stored in the RAM 73 or the flash memory 74, for example. Specifically, the detection of the thermistor 8 when the condition that “the temperature detected by the thermistor 8 is within a certain temperature difference (for example, 5 ° C.) over a predetermined time (boiling detection determination time)” is satisfied. Temperature) Thc is stored in the RAM 73 or the like.

  In the “boiled (low heat) state” indicated by the block of S3, the temperature detected by the thermistor 8 is equal to or lower than the lower limit temperature (second temperature) Thb, and the measurement time T2 is the second threshold time (for example, 15 seconds). When it reaches, it shifts to the "boiled (high fire) state" shown by the block of S4. In this “boiled (high fire) state”, the heating power of the gas burner 6 is a strong heating power (first heating power state), and at this time, the electromagnetic valve 61 shown in FIG. Further, the counting of the measurement time T2 is restarted at the timing of shifting to the “boiled (high fire) state” indicated by the blocks from S3 to S4.

  In the “boiled (high fire) state” indicated by the block of S4, the temperature detected by the thermistor 8 is equal to or higher than the upper limit temperature (first temperature) Tha, and the measurement time T2 is the second threshold time (for example, 15 seconds). When it reaches, it shifts to the “boiled (low heat) state” indicated by the block of S3. In addition, the counting of the measurement time T2 is restarted at the timing of shifting from the S4 to the “boiled (low heat) state” indicated by the block of S3.

Such control is the basic control in the cooking mode.
Further, in this configuration, the above-described upper limit temperature (first temperature) Tha and lower limit temperature (second temperature) Thb can be changed. Specifically, the control circuit 70 corresponds to an example of a switching temperature determination unit, and as the equilibrium temperature (equilibrium temperature detected by the equilibrium temperature detection unit) detected by the above-described method increases, the cooking mode (predetermined) The upper limit temperature Tha is determined by a determination method for increasing the upper limit temperature (first temperature) Tha used in the cooking mode.

  Specifically, the above-described temperature Thc at the time of boiling detection (“the temperature detected by the thermistor 8 is within a certain temperature difference (for example, 5 ° C.) over a predetermined time (boiling detection determination time)”) When the detected temperature of the thermistor 8 at the time when is established is Thc ≧ α (° C.), the upper limit temperature (first temperature) Tha is set to Tha = m × Thc + n (° C.). Note that m ≧ 1 and n <0. α is a temperature slightly higher than the boiling temperature of water at 1 atm, and is a value such that α = 100−n, for example. When Thc <α (° C.), the upper limit temperature Tha is a predetermined first fixed value. This first fixed value is a value smaller than α.

  In the following, as a representative example, m = 1, n = −3, and α = 103. In this example, when Thc ≧ 103 (° C.), the upper limit temperature (first temperature) Tha is Tha = Thc−3 (° C.). When the upper limit temperature Tha is set in this way, the upper limit temperature Tha increases as the temperature Thc increases, and the degree of increase in the temperature Thc at the time of boiling detection is approximately the same as the increase in the upper limit temperature Tha. . For example, if the temperature Thc at the time of boiling detection rises by 1 ° C., the upper limit temperature Tha similarly rises and is raised by 1 ° C. In the case of Thc <103 (° C.), the upper limit temperature Tha is a first fixed value (for example, 100 ° C.).

  Further, the control circuit 70 corresponding to the switching temperature determination unit determines the lower limit temperature by a determination method for increasing the lower limit temperature Thb used in the cooking mode (predetermined cooking mode) as the equilibrium temperature increases, The relationship between the upper limit temperature Tha and the lower limit temperature Thb is determined so that the difference between the upper limit temperature Tha and the lower limit temperature Thb increases as the temperature increases.

  Specifically, when Thc ≧ β (° C.), the lower limit temperature Thb is (Thc−r) × q + s (° C.). In this equation, 0 <q <1 and q <m. R> s. β and r are slightly higher than the boiling temperature of water at 1 atmosphere. s is a temperature slightly lower than the boiling temperature of water at 1 atm. When Thc <β (° C.), the lower limit temperature Thb is a second fixed value that is smaller than the first fixed value described above. This second fixed value is, for example, r (° C.).

  In the following, as typical examples, q = 3/4, β = r = 103, and s = 97. In this example, when Thc ≧ 103 ° C., Thb = (Thc−103) × 3/4 + 97 (° C.). When the lower limit temperature Thb is set in this way, the lower limit temperature Thb increases as the temperature Thc at the time of boiling detection increases, but the increase in the lower limit temperature Thb exceeds the degree of increase in the temperature Thc at the time of boiling detection. The degree becomes smaller, and the degree of increase in the lower limit temperature Thb becomes smaller than the degree of increase in the upper limit temperature Tha. For example, when the temperature Thc at the time of boiling detection rises by 1 ° C., the lower limit temperature Tha increases within a range of less than 1 ° C. When Thc <103 ° C., the lower limit temperature Thb is a second fixed value (for example, 97 ° C.).

  In the state transition diagram of FIG. 4, all the parameters such as T1, T2, Tha, and Thb described above are reset when shifting from the block S0 to the block S1. Further, when the cooking mode is set when the gas burner 6 is ignited in a mode other than the cooking mode, the process moves to the block of S1 and the control shown in FIG. 4 is performed. In this case as well, all parameters such as T1, T2, Tha, Thb are reset when the process proceeds to the block of S1. In the control of FIG. 4, when the temperature detected by the thermistor S8 falls below a predetermined third threshold (for example, 70 ° C.) in the boiling standby state of S2 or the boiled (high fire) state of S4, Transition to the judgment state. Thus, even when returning to S1 by falling below the third threshold, all the parameters such as T1, T2, Tha, Thb are reset.

  As described above, in this configuration, the upper limit temperature (first temperature) Tha is set to be larger as the equilibrium temperature becomes higher. Therefore, when the equilibrium temperature is higher, the temperature of the contents is further increased in the block of S4. After that, the process moves to the block of S3 and is switched to the second thermal power state. Therefore, it is difficult to cause a situation where the heating power is weakened when the temperature of the contents is not sufficiently increased. On the contrary, since the upper limit temperature Tha is set smaller as the equilibrium temperature becomes smaller, the temperature of the contents is sufficiently increased, but the state of S4 is maintained without switching the heating power, and is strong for a long time. It is less likely to be sustained by firepower.

  Further, in this configuration, the lower limit temperature (second temperature) Thb is set to be larger as the equilibrium temperature becomes higher. Therefore, when the equilibrium temperature is higher, the content of S4 is reduced before the temperature of the contents becomes too low in the block of S3. It moves to a block and it becomes easy to switch to a 1st thermal power state. Therefore, it becomes easy to avoid the situation where temperature is maintained in a state where heating is insufficient. On the contrary, since the lower limit temperature Thb is set smaller as the equilibrium temperature becomes lower, when the equilibrium temperature is lower, the temperature of the contents is appropriately reduced in the block of S3, and then the process proceeds to the block of S4. It becomes easy to switch to the thermal power state. Therefore, it becomes easy to avoid the situation where the temperature is maintained in an excessively heated state.

  Further, when the equilibrium temperature is relatively small (that is, when the temperature of the cooking container is relatively good following the temperature of the contents), the difference between the upper limit temperature Tha and the lower limit temperature Thb can be reduced. It is possible to control the temperature of the contents with high accuracy so as to keep the temperature of the contents within a narrow temperature range.

  Conversely, when the equilibrium temperature is relatively large and the temperature of the cooking container is relatively poor following the temperature of the contents, the temperature of the contents tends to vary, so the difference between the upper limit temperature Tha and the lower limit temperature Thb is If the temperature is reduced and controlled with a narrow temperature range, the temperature of the contents tends to deviate from the target temperature range. For example, even when the temperature of the cooking container has reached the lower limit temperature, a situation in which the temperature of the contents does not decrease so much is likely to occur, and there may be a case where the heating power is switched to a strong heating power while the temperature of the contents is high. On the other hand, if the difference between the upper limit temperature Tha and the lower limit temperature Thb is increased when the equilibrium temperature is relatively large as in the present configuration, the characteristics when the followability is poor (temperature variation of contents) It becomes easy to cope with.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following examples are also included in the technical scope of the present invention.
(1) Although the gas stove 1 shown in FIG. 1 is a table stove, it may be a built-in stove or the like.
(2) In Example 1, the upper limit temperature Tha and the lower limit temperature Thb are set to temperatures corresponding to the equilibrium temperature. However, only one temperature is set according to the equilibrium temperature, and the other temperature is set. It may be a fixed temperature.
(3) In the process of FIG. 4, a limit temperature for performing a protection operation can be provided in the blocks S1 to S4. For example, in the block of S1, a protective operation may be performed so that the gas burner 6 is extinguished when the temperature detected by the thermistor 8 reaches 270 ° C. In the blocks S2 to S4, when the detected temperature of the thermistor 8 reaches 170 ° C., a protective operation may be performed so that the gas burner 6 is extinguished.
(4) In the first embodiment, the first temperature is the upper limit temperature Tha and the second temperature is the lower limit temperature Thb. However, the first temperature may be a temperature that is a switching timing for suppressing the thermal power, and the second temperature is Any temperature may be used as the switching timing for increasing the thermal power. For example, the first temperature may be a temperature that assumes an overshoot. In this case, if the detected temperature is switched from a strong heating power to a weak heating power at the timing when the detected temperature reaches the first temperature, the detected temperature is increased by the overshoot. One temperature may be exceeded. Similarly, the second temperature may be a temperature assuming a downshoot. In this case, if the detected temperature is switched from a low heating power to a strong heating power when the detected temperature reaches the second temperature, the detected temperature is reduced by the downshoot. It may be less than the second temperature.

DESCRIPTION OF SYMBOLS 1 ... Gas stove 6 ... Gas burner 8 ... Thermistor (container temperature detection part)
70 ... Control circuit (mode setting unit, control unit, equilibrium temperature detection unit, switching temperature determination unit

Claims (1)

A gas burner for burning the combustion gas and heating the cooking vessel;
A container temperature detector for detecting the temperature of the cooking container;
A mode setting unit for setting the control mode of the gas burner to at least a predetermined cooking mode;
When the predetermined cooking mode is set by the mode setting unit, when the temperature detected by the container temperature detection unit reaches a predetermined first temperature when the gas burner is in a predetermined first heating power state. The gas burner is switched to the second thermal power state in which the thermal power is less than that in the first thermal power state, and after the switching to the second thermal power state, the temperature detected by the container temperature detection unit is a predetermined second temperature. A control unit that performs switching control between the first thermal power state and the second thermal power state so as to switch the gas burner to the first thermal power state,
Based on the temperature detection result by the container temperature detection unit in a state where the cooking container is heated by the gas burner, an equilibrium state is occurring in which the contents in the cooking container are boiling in the cooking container. An equilibrium temperature detector for detecting the equilibrium temperature;
When the equilibrium temperature detected by the equilibrium temperature detector is equal to or higher than the first threshold and the second threshold, the first temperature and the second temperature used in the predetermined cooking mode are increased as the equilibrium temperature increases. The difference between the first temperature and the second temperature is increased by increasing and decreasing the increase degree of the second temperature than the increase degree of the first temperature, and the equilibrium temperature is less than the first threshold value. In some cases, the first temperature is set to a first fixed value that is smaller than the first threshold value, and when the equilibrium temperature is less than the second threshold value, the second temperature is set to a first value that is smaller than the first fixed value. A switching temperature determination unit that determines the first temperature and the second temperature in a determination method of 2 fixed values ;
Gas stove with.

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