JP2017142007A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker that can suppress a fluctuation range of temperature detected from a cooking container to a lower range when heating means automatically adjusts an amount of heating for the cooking container.SOLUTION: The heating means 2 for heating a cooking container is capable of adjusting a heating amount for each heating amount level of multiple steps. Heating control means 16 automatically changing a heating amount lowers a level of heating amount step by step according to a decrease in a temperature difference between a detection temperature and a target temperature when the detection temperature rises, and increases the level of heating amount step by step depending on an increase in a temperature difference between a detection temperature and a target temperature when the detection temperature falls.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heating cooker having a function of automatically adjusting a heating amount of a cooking container by a heating means in accordance with the temperature of the cooking container.

  Examples of this type of cooking device include a gas stove equipped with a stove burner as heating means, an electromagnetic cooker equipped with an induction heating (IH) unit as heating means, or an electric stove equipped with a nichrome wire heater as heating means.

  For example, the gas stove includes a pan bottom temperature sensor (temperature detection means) that detects the temperature of the bottom of the pan (cooking vessel) heated by the stove burner (heating means), and according to the detected temperature of the pan bottom temperature sensor. In addition, it is known that the heating temperature (heating amount) of the stove burner is switched and adjusted in two stages of low heat and high heat to maintain the heating temperature of the pan in a predetermined temperature range (see, for example, Patent Document 1).

JP-A-6-123429

  However, even if the heating amount is switched between two levels, it is difficult to maintain the temperature of the cooking container in which the object to be heated is stored (the temperature detected by the pan bottom temperature sensor) within a predetermined temperature range. There is a disadvantage that the fluctuation range of the temperature of the cooking container with respect to the temperature becomes large.

  In view of the above points, an object of the present invention is to provide a heating cooker that can suppress the fluctuation range of the temperature detected from the cooking container to be small when automatically adjusting the heating amount of the cooking container by the heating means. To do.

  In order to achieve such an object, the present invention provides a heating means for heating a cooking container containing an object to be cooked, a temperature detecting means for detecting the temperature of the cooking container, and a detection temperature of the temperature detecting means is preset. A heating cooker comprising: a heating control unit that increases a heating amount of the heating unit when the temperature is lower than the target temperature, and decreases a heating amount of the heating unit when the detected temperature is higher than the target temperature. The heating amount can be adjusted for each heating amount level obtained by dividing the heating amount range from the minimum heating amount to the maximum heating amount into a plurality of stages, and the heating control means detects the temperature detected by the temperature detecting means. In response to a decrease in the temperature difference between the detected temperature and the target temperature in a predetermined range of steps of the total heating amount level (for example, the difference between the detected temperature and the target temperature). When the heating amount level is decreased by one step (every 1 ° C. decrease) and the temperature detected by the temperature detecting means is decreasing, the detected temperature and the target temperature are within a predetermined number of steps of the total heating amount level. The heating amount level is increased by one step in accordance with an increase in the temperature difference (for example, every time the difference between the detected temperature and the target temperature increases by 1 ° C.).

  When the heating means starts heating the cooking container containing the food to be cooked, the heating control means automatically adjusts the heating amount of the heating means so that the temperature detected by the temperature detection means becomes the target temperature. At the initial stage when the heating means starts heating, the temperature detected by the temperature detecting means is lower than the target temperature, so that the heating control means controls the heating means to increase the heating amount level. During this time, the heating control means calculates the difference between the detected temperature and the target temperature in accordance with the change in the detected temperature.

  When the detected temperature approaches the target temperature due to the temperature rise of the cooking container, the difference between the detected temperature and the target temperature becomes small. Along with this, the heating control means decreases the heating amount level by one step according to the decrease in the temperature difference between the detected temperature and the target temperature.

  Specifically, for example, when the maximum of the predetermined number of stages range is the heating amount level “6” and the minimum is the heating amount level “1”, the heating control means sets the difference between the detected temperature and the target temperature to 6 ° C. Then, the heating means is instructed to perform heating at the heating level “6”. Thereafter, the heating control means sets the heating amount level “5” when the difference between the detected temperature and the target temperature reaches 5 ° C., and sets the heating amount level “4” when the difference between the detected temperature and the target temperature reaches 4 ° C. Thereafter, similarly, every time the difference between the detected temperature and the target temperature decreases by 1 ° C., the heating amount level is decreased by one step.

  According to this, since the heating amount level gradually decreases as the detected temperature approaches the target temperature due to the temperature rise of the cooking container, the temperature rise of the cooking container toward the target temperature can be delayed, and the excessive temperature An increase (that is, an increase in the temperature of the cooking container after the detected temperature becomes equal to the target temperature) can be suppressed. In addition, the heating control means sets the heating amount level by associating the frequency of the difference between the detected temperature and the target temperature with the number of steps of the heating amount level (for example, the heating amount replaced with the same number as the frequency of the temperature difference) Therefore, the control can be simplified.

  In addition, after the detected temperature exceeds the target temperature, when the detected temperature changes from rising to falling and the detected temperature falls below the target temperature, the heating control unit controls the heating amount of the heating unit so as to suppress an excessive decrease in the detected temperature. Is adjusted automatically. During this time, the heating control means calculates the difference between the detected temperature and the target temperature in accordance with the change in the detected temperature. Then, when the detected temperature departs from the target temperature due to the temperature drop of the cooking container, the difference between the detected temperature and the target temperature increases, so that the heating control means responds to the increase in the temperature difference between the detected temperature and the target temperature. Increase the heating level one step at a time.

  Specifically, for example, when the maximum of the predetermined range of the number of stages is the heating amount level “6” and the minimum is the heating amount level “1”, the heating control means has a difference between the detected temperature and the target temperature of 2 ° C. At this time, the heating means is instructed to perform heating at the heating level “2”. Thereafter, the heating control means sets the heating amount level “3” when the difference between the detected temperature and the target temperature reaches 3 ° C., and sets the heating amount level “4” when the difference between the detected temperature and the target temperature reaches 4 ° C. In the same manner, the heating amount level is increased by one step each time the difference between the detected temperature and the target temperature increases by 1 ° C.

  According to this, since the heating level increases as the detected temperature becomes farther from the target temperature due to the temperature drop of the cooking container, the temperature drop of the cooking container can be quickly suppressed, and the fluctuation range of the temperature of the cooking container with respect to the target temperature can be reduced. Can be small. At this time as well, the heating control means sets the heating amount level by associating the frequency of the difference between the detected temperature and the target temperature with the number of steps of the heating amount level (for example, the same number as the frequency of the temperature difference). Therefore, the control becomes extremely simple.

  In addition, the target temperature in this invention shall include what was comprised by the temperature range which consists of an upper limit temperature and a minimum temperature.

  Further, in the cooking device of the present invention, the operation knob that allows the setting of the heating amount level by the user's operation, and a plurality of position display units that indicate each heating amount level corresponding to the operation amount of the operation knob And a light emitting element provided in each position display unit that can selectively emit light of a plurality of colors, and a light emitting element of a position display unit that indicates a heating amount level set by a user by operating the light. When the heating amount level is changed by the means, the position indicating the heating amount level changed by the heating control means is maintained while maintaining the state in which the light emitting element of the position display section indicating the heating amount level set by the user emits light. And a light emitting element control unit for causing the light emitting element of the display unit to emit light in a color different from that of the light emitting element of the position display unit indicating a heating amount level set by a user.

  As described above, in the heating cooker of the present invention, the heating amount is automatically adjusted by the heating control means so that the temperature of the cooking container becomes the target temperature. On the other hand, the heating cooker of the present invention can set the heating amount level by the user operating the operation knob. For this reason, when the heating of the cooking container is started, the heating amount level set by the user by the operation knob may be changed by the heating control means. As a result, the cooking container is heated with a heating amount different from that manually set by the user, which makes the user feel uncomfortable.

  Therefore, the light emitting element control means first maintains the state where the light emitting element of the position display unit indicating the heating amount level set by the user is caused to emit light. Thereafter, when the heating control means changes the heating amount level, the light emitting element control means displays the light emitting element of the position display section indicating the changed heating amount level at this time, and the position display indicating the heating amount level set by the user. The light is emitted in a color different from that of the light emitting element of the part. Accordingly, the user can visually check the manually set heating amount level and the automatically changed heating amount level, and can reduce the user's uncomfortable feeling.

The figure which shows typically the structure of the principal part of the gas stove which is embodiment of this invention. The flowchart which shows the action | operation of a controller. The figure which shows the operation knob. The figure explaining the light emission form of the position display part of an operation knob.

  Embodiments of the present invention will be described with reference to the drawings. In this embodiment, the gas stove 1 shown in FIG. 1 is adopted as a heating cooker. As shown in FIG. 1, the gas stove 1 performs a desired instruction | indication and various settings with respect to the controller 3 by the user operating the stove burner 2 (heating means), the controller 3 which controls the stove burner 2, and a user. And an operation panel 4 including a switch group (not shown).

  A pan bottom temperature sensor 7 (temperature detection means) is provided at the center of the stove burner 2. The pan bottom temperature sensor 7 comes into contact with the bottom of the pan 9 when the pan 9 (cooking container) is placed on the virtues 8 and outputs a signal indicating the detected temperature of the bottom of the pan 9 heated by the stove burner 2. .

  The stove burner 2 is ignited, heated, and extinguished by an operation knob 10 that can be pushed and rotated. That is, when the operation knob 10 is pushed, the burner 2 is ignited or extinguished. Further, by rotating the operation knob 10, the heating power (heating amount) level of the stove burner 2 (adjustment of the supply flow rate of fuel gas to the stove burner 2) can be adjusted. Note that, in the stove burner 2 of the present embodiment, the thermal power level (heating amount level) can be adjusted to 9 levels (minimum thermal power level “1” to maximum thermal power level “9”).

  A fuel gas is supplied to the stove burner 2 through a gas supply pipe 11. The gas supply pipe 11 is provided with an original electromagnetic valve 12 that opens and closes the gas supply pipe 11 and a flow rate adjustment valve 13 that adjusts the flow rate of the fuel gas flowing through the gas supply pipe 11.

  An ignition electrode 14 for igniting the burner 2 and a thermocouple 15 for detecting the combustion state of the burner 2 are provided in the vicinity of the burner 2.

  The controller 3 controls the operation of the gas stove 1 by executing a control program for the gas stove 1 held in a memory (not shown).

  As shown in FIG. 1, the controller 3 includes a thermal power control unit 16 (heating control means) and a position display control unit 17 (light emitting element control means) as functions. The thermal power control unit 16 further includes a temperature difference calculation unit 18 (temperature difference calculation unit), a temperature trend measurement unit 19 (temperature trend measurement unit), and a level conversion unit 20 (level conversion unit) as functions. .

  An operation signal of the operation knob 10 of the stove burner 2, a signal indicating the detected temperature of the pan bottom temperature sensor 7, a signal indicating flame detection of the thermocouple 15, and the like are input to the controller 3.

  The controller 3 controls the operation of the original electromagnetic valve 12, the flow rate adjustment valve 13, the ignition electrode 14 and the like of the gas supply pipe 11 by outputting a control signal corresponding to each function.

  The flow rate control valve 13 is an electric valve that employs a proportional valve or a flow rate switching valve and changes the gas flow rate of the gas supply pipe 11 by a valve body (not shown) driven by a stepping motor 21. The controller 3 switches the heating power level of the stove burner 2 by changing the opening degree of the flow control valve 13 via the stepping motor 21.

  The thermal power control unit 16 of the controller 3 automatically adjusts the thermal power level to prevent overheating based on the temperature detected by the pan bottom temperature sensor 7 while performing the combustion operation of the stove burner 2 based on the operation signal of the operation knob 10.

  Here, the operation of the controller 3 according to the gist of the present invention will be described with reference to a flowchart. As shown in FIG. 2, when the operation knob 10 is operated by the user, the thermal power control unit 16 ignites the burner 2 in STEP 1. At this time, the thermal power control unit 16 adjusts the ignition thermal power to the thermal power level “4” and ignites.

  Next, when it is detected in STEP 2 that the temperature detected by the pan bottom temperature sensor 7 has become 200 ° C. or higher, the process proceeds to STEP 3 where the temperature difference calculation unit 18 of the controller 3 sets the preset target temperature and pan bottom temperature sensor 7. A difference Tk (absolute value) from the detected temperature is calculated.

  Subsequently, in STEP 4, the temperature tendency measuring unit 19 of the controller 3 determines whether or not the detected temperature of the pan bottom temperature sensor 7 is rising (including sideways) (current detected temperature−detected temperature before 5 seconds ≧ 0). ). If the controller 3 determines in STEP 4 that the temperature detected by the pan bottom temperature sensor 7 is rising (including sideways), the process proceeds to STEP 5.

  The controller 3 proceeds to STEP 5 and proceeds to STEP 6 when Tk is 9 ° C. or higher, and the thermal power control unit 16 sets the thermal power level “9” and returns to STEP 3. If Tk is not 9 ° C. or higher in STEP 5, the process proceeds to STEP 8 if Tk is 6 ° C. or higher in STEP 7 and the thermal power control unit 16 sets the thermal power level to “6”. If Tk is not 6 ° C. or higher in STEP 7, the process proceeds to STEP 10 if Tk is 5 ° C. or higher in STEP 9 and the thermal power control unit 16 sets the thermal power level to “5”. If Tk is not 5 ° C. or higher in STEP 9, the process proceeds to STEP 12 if Tk is 4 ° C. or higher in STEP 11 and the thermal power control unit 16 sets the thermal power level to “4”. If Tk is not 4 ° C. or higher in STEP 11, the process proceeds to STEP 14 if Tk is 3 ° C. or higher in STEP 13 and the thermal power control unit 16 sets the thermal power level to “3”. If Tk is not 3 ° C. or higher in STEP 13, the process proceeds to STEP 16 if Tk is 2 ° C. or higher in STEP 15 and the thermal power control unit 16 sets the thermal power level to “2”. If Tk is not 2 ° C. or higher in STEP 15, the process proceeds to STEP 17, the thermal power control unit 16 sets the thermal power level “1”, and the process returns to STEP 3.

  In the processing in STEP8, STEP10, STEP12, STEP14, and STEP16, the level conversion unit 20 converts the value of Tk into a value that is used as the thermal power level as it is.

  Moreover, when it is not determined in STEP 4 that the temperature detected by the pan bottom temperature sensor 7 is rising (including sideways), the temperature trend measuring unit 19 of the controller 3 decreases the temperature detected by the pan bottom temperature sensor 7. The process proceeds to STEP18. When Tk is 7 ° C. or higher in STEP 18, the process proceeds to STEP 19, and the thermal power control unit 16 sets the thermal power level to “9”. When Tk is not 7 ° C. or higher in STEP 18, the process proceeds to STEP 7.

  As described above, the controller 3 determines that the difference between the detected temperature and the target temperature is within the range of the thermal power levels “6” to “1” (predetermined number range) when the detected temperature of the pan bottom temperature sensor 7 is increasing. Each time the temperature decreases by 1 ° C, the thermal power level is decreased by one step, and when the detected temperature of the pan bottom temperature sensor 7 is decreasing, the detected temperature is within the range of the thermal power level "6" to "1" (predetermined number of stages range) Each time the difference from the target temperature increases by 1 ° C., the heating power level is increased by one step.

  According to this, when the temperature of the cooking vessel is rising, the temperature rise of the cooking vessel can be delayed as the detected temperature approaches the target temperature, and an excessive temperature rise can be suppressed. When the temperature is decreasing, the temperature drop of the cooking container can be suppressed as the detected temperature becomes farther from the target temperature, so that the fluctuation range of the temperature of the cooking container with respect to the target temperature can be reduced.

  In the present embodiment, the thermal power level is increased by one step each time the difference between the detected temperature and the target temperature increases by 1 ° C. in the range of thermal power levels “6” to “1”. Each time the difference between the detected temperature and the target temperature increases by 1 ° C. within the range of “1”, the thermal power level may be increased by one step. In this case, the predetermined step number range in the present invention is the range of the thermal power levels “9” to “1”.

  By the way, according to the controller 3 of the present embodiment, when the detected temperature is in the vicinity of the target temperature, the thermal power level is automatically switched, but the burner 2 has a thermal power level different from the thermal power level manually set by the user. If combustion control is performed, the user may feel confused or may be mistaken for a malfunction.

  Therefore, in the present embodiment, as shown in FIG. 3, a plurality of position display portions 10 a, 10 b, 10 c, 10 d, and 10 e are provided around the operation knob 10, and the position display portions 10 a, 10 b, The thermal power level can be displayed by the light emission modes 10c, 10d, and 10e. Note that a light emitting element that can selectively emit light of two colors is employed.

  Each position display unit 10a, 10b, 10c, 10d, 10e is provided for each predetermined rotation angle (operation amount) of the operation knob 10, and is controlled by the position display control unit 17 of the controller 3 as shown in FIG. Is done.

  The position display control unit 17 displays nine levels from the thermal power level “1” to the thermal power level “9” using the five position display units 10a, 10b, 10c, 10d, and 10e. As shown in FIG. 4, the light emission forms in the position display portions 10a, 10b, 10c, 10d, and 10e are as follows when the thermal power levels are “1”, “3”, “5”, “7”, and “9”. Is in a lighting state, and in the case of indicating the thermal power level “2”, “4”, “6”, “8”, it is in a blinking state.

  And the position display control part 17 maintains the state which made the light emitting element of the position display part which shows the thermal power level (including the preset thermal power level at the time of ignition) manually set by the user to emit light in blue. Then, the light emitting element of the position display unit indicating the thermal power level automatically changed by the thermal power control unit 16 emits light in red.

  According to this, the thermal power level manually set by the user and the thermal power level automatically changed by the thermal power control unit 16 can be clearly discriminated, and the user can be prevented from feeling confused or mistaken.

  In the present embodiment, when the temperature detected by the pan bottom temperature sensor 7 is increasing, the heating level is decreased by one step each time the difference between the detected temperature and the target temperature decreases by 1 ° C. When the detected temperature of 7 is decreasing, the heating amount level is increased by one step each time the difference between the detected temperature and the target temperature increases by 1 ° C. However, the present invention is not limited to this. When the temperature detected by the pan bottom temperature sensor 7 is rising, the heating level is decreased by one step according to the decrease in the temperature difference between the detected temperature and the target temperature, and the temperature detected by the pan bottom temperature sensor 7 is decreased. When the temperature is within the range, the heating level may be increased step by step in accordance with an increase in the temperature difference between the detected temperature and the target temperature.

  Moreover, in this embodiment, although the gas stove 1 was demonstrated, this invention is not restricted to the gas stove 1, For example, it can employ | adopt also with an electromagnetic cooker or an electric stove. In the case of an electromagnetic cooker or an electric stove, the same effect as that of the present embodiment can be obtained by controlling the power supplied to the induction heating unit and the nichrome wire heater instead of controlling the heating power for the stove burner 2 as described above. Can be obtained.

  DESCRIPTION OF SYMBOLS 1 ... Gas stove (heating cooker), 2 ... Combustor (heating means), 7 ... Pan bottom temperature sensor (temperature detection means), 9 ... Pan (cooking container), 10 ... Operation knob, 10a, 10b, 10c, 10d, 10e ... Position display unit, 16 ... Thermal power control unit (heating control means), 17 ... Position display control unit (light emitting element control means).

Claims (2)

Heating means for heating the cooking container containing the object to be cooked, temperature detecting means for detecting the temperature of the cooking container, and heating of the heating means when the temperature detected by the temperature detecting means is lower than a preset target temperature In a heating cooker comprising heating control means for increasing the amount and reducing the heating amount of the heating means when the detected temperature is higher than the target temperature,
The heating means is capable of adjusting the heating amount for each heating amount level obtained by dividing the heating amount range from the minimum heating amount to the maximum heating amount into a plurality of stages,
When the detected temperature of the temperature detecting means is rising, the heating control means is heated according to a decrease in temperature difference between the detected temperature and the target temperature within a predetermined number of stages within the total heating amount level. When the level is decreased step by step and the detected temperature of the temperature detecting means is decreasing, the temperature difference is increased in a predetermined number of steps within the total heating amount level according to the increase in temperature difference between the detected temperature and the target temperature. A cooking device characterized by increasing the heating level one step at a time.   An operation knob that allows the user to set the heating amount level, a plurality of position display sections that indicate each heating amount level corresponding to the operation amount of the operation knob, and a plurality of position display sections that are provided on each position display section. When a light emitting element capable of selectively emitting light of a color and a light emitting element of a position display unit indicating a heating amount level set by an operation by a user are emitted, and when the heating amount level is changed by the heating control unit, The user sets the light emitting element of the position display unit indicating the heating amount level changed by the heating control means while maintaining the state where the light emitting element of the position display unit indicating the heating amount level set by the user emits light. The cooking device according to claim 1, further comprising: a light emitting element control unit that emits light in a color different from that of the light emitting element of the position display unit that indicates the heating amount level.