JP5892888B2 - Cooking device and cooking program - Google Patents

Description

  The present invention relates to a cooking device for heating a cooking container containing an object to be heated using a heating means.

  When cooking using a heating cooker, cooking that maintains the set oil temperature, frying pan (pan) temperature, and the like may be performed. At this time, for example, in a conventional induction heating cooker, after determining that the set temperature has been reached based on the output of temperature detection means such as an infrared sensor, the temperature detection is performed in order to maintain the temperature of the pan at an appropriate temperature. The thickness of the pan bottom is determined by the output of the means. Then, in order to keep the output of the temperature detecting means constant, the heating power is controlled in accordance with the output, and the temperature at the time of control is determined according to the result of the determination of the pan bottom thickness, thereby taking into account the shape of the pan. Has been kept constant (see, for example, Patent Document 1). And, for example, when the temperature of the pan is maintained at a constant temperature, when the food is put into the pan and the temperature gradient becomes a negative value greater than or equal to a predetermined value, the temperature is maintained The optimum heating pattern is selected based on the output value of the temperature detection means, the temperature gradient, and the determination result of the pan bottom thickness, and the oil temperature and pan temperature are kept constant.

  As an example of a heating pattern for maintaining the temperature of the oil and the temperature of the pan at an appropriate temperature, for example, a rectangular wave power of 500 W is used, and this rectangular wave power (first rectangular wave power) is induced. In some cases, when it is detected that the temperature detected by the temperature detector has fallen even if it is supplied to the heating coil, it is determined that the cooked food has been introduced (see, for example, Patent Document 2). According to this, when the temperature of oil drastically drops due to the addition of food or other food, the temperature detected by the temperature detector also drops, so the control means detects this temperature drop and controls it. The power supplied to the induction heating coil is controlled so as to maintain the temperature (185 ° C.). When the electric power supplied to the induction heating coil is 500 W and the control temperature (185 ° C.) cannot be maintained and further decreases, the electric power of 1000 W and 1500 W is supplied to stop the temperature drop of the pan bottom and the control temperature (185 ° C. ) Again.

  As a heating pattern to maintain the oil temperature and pan temperature at an appropriate temperature when a load such as ingredients is applied, the infrared sensor, which is a temperature detection means, detects that the pan temperature has become high. When the power control is performed, the temperature of the cooking container detected by the temperature detecting means is the first temperature so that the pot temperature does not suddenly drop and cooking cannot be performed or the user does not feel a sense of power reduction. When it becomes a predetermined value or more, heating at the set heating amount is interrupted until it becomes equal to or lower than a second predetermined value lower than the first predetermined value, and at least two different types of input power are combined. There is an input power pattern in which at least one type is heated with an input power pattern composed of input power with a heating amount smaller than a set heating amount (see, for example, Patent Document 3).

JP 2010-212053 A (Claims 1 and 3, FIGS. 2 to 7) JP 2012-59478 A (FIG. 3) Japanese Patent Laying-Open No. 2011-54304 (Claims 1, 4, 5, and FIG. 3)

  As described above, in a conventional induction heating cooker, a thermistor or the like pressed against the top plate so that the temperature of the oil or the temperature of the frying pan (pan) is kept constant during frying or cooking in a frying pan. The pan temperature (pan bottom temperature) is indirectly detected by the temperature sensor. When the detected sensor output exceeds a predetermined value, heating to the object to be heated is stopped to prevent the oil or pan from becoming high temperature, and when the sensor output falls below a predetermined value, the oil or pan temperature decreases. In order to prevent this, the power to the heating coil is limited so that heating to the object to be heated is resumed.

  At this time, in the induction heating cooker described in Patent Document 1, the output control for the heating coil is performed based on the output level of high-frequency power, the duty ratio, the output time interval, and the like. However, in the example of output control for each coil, a specific output level, duty ratio, output time interval, etc. are not shown.

  In addition, in the induction heating cooker described in Patent Document 2, as a heating pattern for maintaining the temperature of the oil and the temperature of the pan at an appropriate temperature, when the set temperature of the oil is 200 ° C. in fried food cooking, the setting of the oil The control temperature is set to 185 ° C., which is 15 ° C. lower than the temperature, and control is performed with 500 W of rectangular wave power. The specific duty ratio and output time interval of the rectangular wave are not shown. Furthermore, even when no load such as ingredients is applied, the optimum heating pattern varies depending on the amount of oil and the amount of warpage of the pan in order to keep the oil temperature constant. For this reason, there is a possibility that the temperature will continue to decrease with a 500 W rectangular wave power supply, and if this temperature decrease is mistakenly detected as being due to the input of ingredients, there is a possibility that heating will be performed with a strong heating power. It ’s very dangerous.

  Furthermore, in the induction heating cooker described in Patent Document 3 above, when the infrared sensor detects that the pan temperature has become high and performs power control, the pan temperature suddenly drops and cooking cannot be performed. Although it is said that the user does not feel a sense of power reduction, heating can be performed when the load is applied, but the first temperature predetermined value and the second temperature predetermined value are applied before the load is applied. When the control is performed and the value falls below the second predetermined value, heating is performed with the first heating power amount for a relatively long time until the first predetermined value is reached. It may occur and it may take some time for the temperature to drop. Also, when overshoot occurs, if the ingredients are put in, strong thermal power cannot be put in until it falls below the second predetermined value, so it takes time for the temperature to recover. When a heavy load is applied, there is a problem that the finish does not finish smoothly and the clothes are ruptured, and in the frying pan cooking, there is a problem that a feeling of heat cannot be obtained due to stir-fried vegetables.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a cooking device that can accurately heat and maintain the temperature of a cooking container at a predetermined temperature.

A heating cooker according to the present invention comprises heating means for heating a cooking container, control means for controlling the heating means so that the temperature of the cooking container becomes constant, and temperature detection means for detecting the temperature of the cooking container. The control means is a temperature range near the first predetermined temperature set as a target temperature for maintaining the temperature of the cooking container, a temperature range higher than the first predetermined temperature, and a temperature range lower than the first predetermined temperature, A plurality of preset temperatures are set in advance, and when the temperature detection means determines that the temperature is in the temperature range near the first predetermined temperature, the first heating amount is set to such an extent that the temperature can be maintained, When the temperature detection means determines that the temperature exceeds the set temperature in a temperature range higher than the predetermined temperature of 1, the first heating amount set so as to decrease as the temperature difference between the first predetermined temperature and the set temperature increases. Heat with small heating amount When the temperature detection means determines that the temperature is lower than the first set temperature in a temperature range lower than the first predetermined temperature, the first heating is set to increase as the temperature difference between the first predetermined temperature and each set temperature increases. Heating is performed with a heating amount that is greater than the amount, and each heating amount is controlled to heat the cooking container according to an input power pattern configured by combining at least two different types of power, and from the first heating amount, In the case of lowering to a second heating amount smaller than one heating amount, an input power pattern including at least one of two or more different types of power is smaller than the power included in the first heating amount. In the case where the first heating amount is increased to the third heating amount that is larger than the first heating amount, the power that at least one of the two or more different types of power includes as the first heating amount. Than With input power pattern including listening power, and performs control to heat the cooking container to reach the first predetermined temperature.

  According to the heating cooker according to the present invention, in the temperature range near the set first predetermined temperature, heating is performed with the first heating amount set to a heating power that can maintain the temperature, and the set first predetermined temperature is set. If the control means determines that the temperature range is higher than the temperature, heating is performed with a heating amount smaller than the first heating amount set so as to decrease as the temperature difference increases in accordance with the temperature difference from the first predetermined temperature. If the control means determines that the temperature range is lower than the set first predetermined temperature, the first temperature is set to be larger as the temperature difference is larger in accordance with the temperature difference from the first predetermined temperature. Heating control is performed so that the temperature of the cooking container or the like does not fluctuate rapidly by heating with an input power pattern configured by combining at least two kinds of different electric powers by heating with a heating amount larger than the heating amount. Can of cooking container Degrees can be maintained accurately to a first predetermined temperature around. In addition, this makes it possible to accurately detect temperature fluctuations caused by the addition of ingredients when performing frying pan cooking, fried food cooking, or the like.

It is a perspective view of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the control system of the induction heating cooking appliance of Embodiment 1 of this invention. It is a figure explaining the structure for performing the control which concerns on the induction heating of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a figure showing an example of the timing chart which shows operation | movement of the induction heating cooking appliance of this Embodiment. It is a figure which shows an example of the electric power input pattern of the induction heating cooking appliance of embodiment of this invention. It is FIG. (1) which shows the process sequence of the control apparatus 50 when the automatic deep-fried food menu which concerns on Embodiment 4 of this invention is selected. It is FIG. (2) which shows the process sequence of the control apparatus 50 when the automatic deep-fried food menu which concerns on Embodiment 4 of this invention is selected. It is a figure which shows the relationship between the amount of ingredients thrown in, the temperature (detected temperature) of the pan, and a thermal power. It is a figure which shows an example of the electricity supply control pattern etc. in the automatic fried food menu which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
FIG. 1 is a perspective view of an induction heating cooker according to Embodiment 1 of the present invention. As shown in FIG. 1, the heating cooker of this Embodiment demonstrates the induction heating cooker which heats the to-be-heated object which is a heating object using electromagnetic induction. For example, a top plate (top plate) 10 made of crystallized glass that transmits infrared rays, for example, of the main body case 1 mounts a heating target. In the present embodiment, the top plate 10 has a heating port 13L (left side) and a heating port 13R (right side) that are portions where the placed heating object can be induction heated. The operation panel 20 on the right side of the front has dials 21L and 21R for the user to adjust the heating power (electric power) by induction heating at the heating port 13L and the heating port 13R.

  In addition, a central display panel 30 having a liquid crystal display substrate as a display means for displaying set values of various cooking conditions, alarms, and abnormality information is provided on the front surface of the induction heating cooker. In addition, the display panel 31L and the display panel 31R each include a liquid crystal display substrate that displays a heating power value, a heating power level (strong, medium, weak, etc.) in induction heating, and the like. Furthermore, it has the display parts 32L and 32R which display the heating time of the heating target on the heating ports 13L and 10R and the oil temperature at the time of oil cooking with liquid crystal characters or a plurality of light emitting diodes (light emitting bodies). And the upper surface operation part 22 for operation, such as a start of heating operation, is installed.

  Moreover, it has a grill cooker inside the lower left side of the induction heating cooker. The grill cooker has a grill door 41 that can be opened and closed on the left side of the front portion of the induction heating cooker. Moreover, it has the grill storage 42 which is a cooking space where the front opening part was closed so that opening and closing was possible by the grill door 41. And it has the grill net | network 44 which is placed on the saucer 43 placed in the bottom part of the grill store | warehouse | chamber 42, and the saucer 43 and in which to-be-cooked objects, such as a fish, are placed. The grill door 41 is provided with a handle 46 for a user to hold to open and close the grill door.

  And in the upper surface rear part of an induction heating cooking appliance, the inlet 47 for taking in air in the grill warehouse 42 of a grill cooking appliance, etc., and the smoke etc. which generate | occur | produce from the cooking thing in the grill warehouse 42 are discharged | emitted An exhaust port 48 is formed. A part of the air taken in from the intake port 47 is also used for cooling the heating units 60L and 60R described later.

  FIG. 2 is a diagram for explaining a control system of the induction heating cooker according to the first embodiment of the present invention. In FIG. 2, a main power switch 12 supplies or stops power from an external AC power source 200 such as a commercial power source based on a user operation. The power supply circuit 56 performs voltage conversion of the supplied power and supplies it to the control device 50. The control device 50 serving as a control means is constituted by, for example, a microcomputer, and performs various data processing such as calculation to control the entire induction heating cooker. The control device 50 will be described later.

  The inverters 70L and 70R are circuits (means) that are driven based on an instruction from the control device 50, convert electric power from the AC power supply 200 into high-frequency electric power, and supply the high-frequency power to the heating units 60L and 60R, respectively. The heating units 60L and 60R include heating coils 61L and 61R, resonance capacitors 62L and 62R, respectively. The heating coils 61L and 61R are provided in the main body case 1 (on the lower surface side of the top plate 10) corresponding to the heating ports 13L and 13R. By supplying power from the inverters 70L and 70R, an alternating magnetic field is generated by resonance with the resonance capacitors 62L and 62R, and the pan 100 is heated by electromagnetic induction. Here, inverters 70 </ b> L and 70 </ b> R can be driven independently from each other based on an instruction from control device 50. In the following description, in the heating coils 61L and 61R and the like, when there is no particular distinction between left and right, the description will be made with the L and R suffixes omitted.

  Based on an instruction from the control device 50, the grill heater drive circuit 71 performs power supply control for heating a plurality of radiant electric heaters 63 such as sheathed heaters installed in the grill chamber 42 of the grill cooker. The radiant electric heater 63 is installed horizontally, for example, near the ceiling and the bottom of the inside of the grill cabinet 42, and is configured to heat the grill net 44 from above and below. Further, the catalyst heater drive circuit 72 is based on an instruction from the control device 50 and a catalyst (not shown) installed in the inlet portion of the exhaust duct (not shown) from the grill box 42 to the exhaust port 48 or in the middle thereof. The power supply to the catalyst heater 64 that heats the battery is controlled. By heating a catalyst (not shown), the redox action is promoted and the action of removing smoke released from the grill 42 is promoted.

  The display unit drive circuit 33 is a circuit that performs signal generation processing for causing the above-described central display panel 30, display panels 31L and 31R, and display units 32L and 32R to perform display. The voice synthesizer 34 is a device that performs processing for electronically creating and synthesizing voice related to operation guidance for the user, notification when an abnormality occurs, and the like. The speaker 35 is a device that emits a voice or the like created by the voice synthesizer 34 through processing.

  FIG. 3 is a diagram illustrating a configuration for performing control related to induction heating of the induction heating cooker according to Embodiment 1 of the present invention. An infrared sensor 80 serving as a temperature detecting means is attached to the lower surface side of the top plate 10. Infrared rays emitted from the pan 100 (for example, the bottom surface of the pan 100) placed on the top plate 10 are received through the top plate 10 to detect the amount of infrared rays. In the present embodiment, the contact-type temperature sensor 81 is constituted by, for example, a thermistor or a thermocouple, is attached in contact with the top plate 10, and detects the temperature of the pan 100 via the top plate 10.

  Here, since the infrared sensor 80 receives infrared rays through the top plate 10, it also receives infrared rays emitted from the top plate 10. Therefore, for example, the light receiving surface of the infrared sensor 80 may be covered with a band-pass filter having light transmission characteristics in a predetermined band so that the infrared component related to the radiation of the top plate 10 may be removed. Further, a filter having the same light transmission characteristic as that of the crystallized glass of the top plate 10 may be provided in front of the infrared light receiving surface of the infrared sensor 80 to remove the infrared component related to the radiation of the top plate 10. By providing the filter, infrared rays emitted from the pan 100 can be received, and the temperature of the pan 100 (pan temperature) can be detected with higher accuracy.

  The light shielding means (light shielding film) 11 is printed on, for example, the lower surface of the top plate 10 so that the inside of the induction heating cooker cannot be seen from the outside. However, for the part located above the infrared sensor 80, the light shielding means 11 is not provided or the printing area is reduced within a range that does not affect the viewing angle of the infrared sensor 80 so that the infrared rays from the pan 100 are transmitted. deep. Alternatively, the light shielding unit 11 or the top plate 10 may be made of a material that transmits infrared rays but does not transmit visible light.

  The control device 50 controls the entire induction heating cooker as described above. Here, it is assumed that the control device 50 includes a temperature determination unit 51, a warp amount determination unit 52, a bottom thickness determination unit 53, an oil amount determination unit 54, and an emissivity determination unit 55. In particular, the temperature determination unit 51 is a unit that realizes a function of determining the temperature of the pan 100 based on the amount of infrared rays related to detection by the infrared sensor 80, the temperature related to detection by the contact temperature sensor 81, and the like. The warpage amount determination means 52 is a means for realizing a function of determining the warpage amount of the pan 100 based on the temperature or the like related to detection by the infrared sensor 80 or the contact temperature sensor 81. Furthermore, the bottom thickness determination means 53 is a means for realizing a function of determining the bottom thickness of the pan 100 based on the temperature or the like related to detection by the infrared sensor 80 or the contact temperature sensor 81. The oil amount determination unit 54 is a unit that realizes a function of determining the amount of oil in the pan 100 based on the temperature or the like related to detection by the infrared sensor 80 or the contact temperature sensor 81. The emissivity determination unit 55 is a unit that realizes a function of determining the infrared emissivity of the pan 100 based on the temperature associated with the detection of the infrared sensor 80 and the contact-type temperature sensor 81.

  Here, the microcomputer included in the control device 50 according to the present embodiment is mainly configured by control arithmetic processing means (not shown) such as a CPU (Central Processing Unit). In addition, it has storage means (not shown), and has data in which processing procedures related to functions, control, etc. performed by the various determination means described above are programs. Then, the control arithmetic processing means executes processing based on the program data to realize control. Here, for example, a hardware resource such as an external electrical / information device, computer, server, etc. has a program, and exchanges data and cooperates to easily realize at least a part of processing in an external device. be able to. Further, although the control device 50 performs processing in order to realize the functions of the temperature determination unit 51 and the like, a dedicated arithmetic circuit or the like may be provided outside the control device 50.

  Next, operation | movement of the induction heating cooking appliance of this Embodiment is demonstrated. When the user sets input power (thermal power) and presses a heating start button (not shown), the control device 50 causes the inverter 70 to supply the heating coil 61 power of the heating unit 60. At this time, for example, by detecting the amount of current flowing through the heating coil 61 by a current detection unit (not shown), whether or not the pan 100 is placed on the heating port 13, the pan 100 is suitable for heating ( It is determined whether it is a conforming pan). When it is determined that the pan 100 is placed and is a suitable pan, the inverter 70 supplies power of a predetermined frequency to the heating coil 61 of the heating unit 60 to start the heating operation. A magnetic flux corresponding to electric power having a predetermined frequency is generated from the heating coil 61 to heat the pan 100 by electromagnetic induction.

  Here, in the top plate 10, there is no light shielding means 11 in a portion located above the infrared sensor 80. For this reason, the infrared sensor 80 can receive infrared rays radiated from the heated pan 100. The contact temperature sensor 81 detects the temperature of the pan 100 via the top plate 10.

  The control device 50 receives a signal representing the amount of infrared light received by the infrared sensor 80 and a signal representing the temperature associated with detection by the contact temperature sensor 81. The temperature determination means 51 of the control device 50 determines the temperature of the pan 100 based on the amount of infrared rays related to the light received by the infrared sensor 80. Moreover, the temperature determination means 51 of the control apparatus 50 determines the temperature of the pan 100 using the temperature related to the detection by the contact temperature sensor 81, and the temperature determined by the temperature determination means 51 is a predetermined temperature (for example, 180). When it is determined that the temperature has reached (° C.), the process proceeds to a control process for heating the pan 100 with a predetermined input power pattern.

  Here, the process which calculates | requires the temperature of the pan 100 based on the infrared rays amount which the temperature determination means 51 received with the infrared sensor 80 is demonstrated. The infrared rays received by the infrared sensor 80 are roughly divided into three types as shown in A, B, and C of FIG. A is an infrared ray directly emitted from the pan 100. B is infrared rays emitted from the pan loading surface of the top plate 10. Here, since the top plate 10 is in contact with the pan 100, the top plate 10 exhibits a temperature substantially equal to the temperature of the pan 100. C is an infrared ray emitted from the lower surface side of the top plate 10. Since the heat of the pan 100 is infrared rays that are radiated through the top plate 10, the heat of the pan 100 is delayed.

Although glass is used as the material of the top plate 10, it is known that the infrared emissivity of glass is as high as about 0.84. The control device 50 reads from the infrared sensor 80 the received infrared ray amount P and the ambient temperature To related to detection by a temperature sensor (not shown) incorporated in the infrared sensor 80. Since the infrared ray C is included in the received infrared ray amount P, the temperature determination unit 51 subtracts the amount corresponding to the infrared ray C according to the temperature related to the detection by the contact temperature sensor 81. Infrared amount P1 obtained by subtraction includes infrared A directly radiated from pan 100 and infrared B radiated from the pan contact surface of top plate 10. The infrared emissivity of the pan 100 may take a value from 0.16 to 0.86, but the infrared emissivity of the top plate 10 is about 0.84. Therefore, the temperature determination unit 51 sets the infrared emissivity ε to 0.84, and calculates the temperature Ta of the pan 100 by P1 = σ (ε · Ta ⁴ −To ⁴ ). Here, σ represents the Stefan-Boltzmann constant.

  The temperature determination means 51 can determine the temperature of the pan 100 without delay by performing the above processing.

  FIG. 4 is a diagram illustrating an example of a timing chart showing the operation of the induction heating cooker according to the present embodiment. In the induction heating cooker according to the present embodiment, the pot temperature when the pot temperature is kept at a predetermined temperature. And the relationship between thermal power (input power). Here, heating is started with input power (for example, 1.5 kW in FIG. 4) corresponding to the first heating amount set by the user. For example, control is performed so that the temperature of the pan 100 can be maintained at a first predetermined temperature (for example, 180 ° C.). When heating is started, the infrared sensor 80 sends a signal related to the amount of received infrared light to the temperature determination means 51.

  When it is determined that the temperature related to the determination by the temperature determination unit 51 (infrared sensor 80) has reached the first predetermined temperature (is equal to or higher than the first predetermined temperature), the temperature determination unit 51 (infrared sensor 80) Control is performed so that the pan 100 is heated with an input power pattern configured by a combination of two or more different types of power including strength and weakness based on the temperature information related to the determination.

  FIG. 5 is a diagram showing an example of an input power pattern of the induction heating cooker according to the embodiment of the present invention. In FIG. 5, the two different input powers are lower than the input power set by the user. Here, in FIG. 5, an input power pattern in which switching between two different input powers is repeated every predetermined time is not limited to this. Three or more different input powers may be switched. Moreover, you may make it vary time according to input electric power.

  When it is determined that the temperature related to the determination by the temperature determination means 51 (infrared sensor 80) has become equal to or lower than the second predetermined temperature (for example, 175 ° C.), the control device 50 determines that the food material load has been input, and the load Set the input power pattern according to the size of.

  At this time, for example, when cooking a stir-fried food, in the case of a high load with a large amount of ingredients to be heated in the pan 100, since the amount of heat absorbed by the ingredients is large, heating is simply stopped. Then, the temperature of the pan 100 tends to decrease. As in this embodiment, after reaching the first predetermined temperature, by repeating the strong and weak input power pattern, heating can be maintained at least without reducing the temperature of the pan 100 at once, and rapidly It is possible to provide an induction heating cooker that is easy to use without causing the temperature of the pan 100 to drop, making cooking impossible, or causing the user to feel a decrease in firepower (electric power).

  Further, in the case of a low load with a small temperature fluctuation due to the input of ingredients, by repeating an input power pattern composed of a combination of two or more different powers including a strong and weak pattern, the fluctuation from the first predetermined temperature can be reduced. It is possible to provide an induction heating cooker that can keep the temperature constant.

  For example, when the pan temperature detected based on the infrared light received by the infrared sensor 80 becomes equal to or higher than the first predetermined temperature, the infrared sensor 80 starts from the weak power (minimum power value) of the input power pattern. When the pan temperature detected based on the received infrared rays is equal to or lower than the first predetermined temperature, the process starts with strong power (maximum power value) of the input power pattern. As a result, when the temperature is higher than the first predetermined temperature, the control starts in the direction in which the temperature decreases, so even if the actual temperature of the pan 100 is higher than the first predetermined temperature, the first When the temperature can be returned to the predetermined temperature and the temperature is lower than the first predetermined temperature, the control starts in the direction of increasing the temperature, so even if the actual temperature of the pan 100 is lower than the first predetermined temperature. The temperature can be immediately returned to the first predetermined temperature. For this reason, the induction heating cooking appliance which can keep temperature constant with high precision can be provided.

  Here, in the present embodiment, the control is performed based on the temperature by the infrared rays related to the detection of the infrared sensor 80. For example, the control is performed after the emissivity is determined by the emissivity determining means 55. Also good. For example, in the case of a pan having an infrared emissivity of 0.16, there is a possibility that the temperature of the pan is determined to be low because the amount of infrared rays A directly radiated from the pan 100 is small. In addition, in the case of a pan having an infrared emissivity of 0.86, the amount of infrared rays A directly emitted from the pan 100 increases. Since the infrared radiation energy fluctuates according to the emissivity of the pan 100 in this way, by determining the emissivity of the pan 100, by defining the input power pattern, heating that takes into account the temperature misdetection due to the emissivity is considered. It can be carried out.

  Further, the bottom thickness of the pan 100 may be determined by the bottom thickness determination means 53. By determining the bottom thickness, when the bottom thickness is thick, the heating power can be increased and the temperature recovery time can be shortened. Further, when the bottom thickness is thin, the heating power is weakened, and cooking can be performed safely while preventing ignition by oil or the like.

  As mentioned above, according to the heating cooker of Embodiment 1, in control of the control apparatus 50 which drives the inverter 70 and performs the induction heating by the heating part 60, and heats the pan 100, it is more than 1st predetermined temperature. If it is determined that the temperature of the oil or pan is not controlled simply by lowering the input power, the pan 100 is heated by controlling the input power according to the input power pattern including the strength. Heating control can be performed so as not to fluctuate rapidly, and the temperature of the pan 100 can be accurately maintained around the first predetermined temperature regardless of the amount of ingredients.

  In addition, this makes it possible to accurately determine temperature fluctuations due to the addition of ingredients when frying pan cooking, fried food cooking, or the like. For this reason, for example, when a temperature drop is detected, the control device 50 can select a larger thermal power so that the temperature can be quickly restored. For example, in the frying pan cooking, a thermal power feeling at the time of adding ingredients is obtained, and in the deep-fried food cooking, even when a heavy load such as a frozen croquette is applied, it is possible to prevent the clothing from bursting.

  Furthermore, since the infrared sensor 80 is used to detect the temperature of the pan 100, the followability is better than when a thermistor or the like is used, and the temperature can be detected with higher accuracy. At this time, the temperature can be detected with higher accuracy by covering the infrared sensor 80 with a filter and removing the influence of infrared rays due to the radiation of the top plate 10 or the like.

Embodiment 2. FIG.
In the present embodiment, the relationship between the first predetermined temperature, the second predetermined temperature, the input power pattern, and the repetition period described in the first embodiment will be described with a specific example.

  For example, as shown in FIG. 5, when setting the input power pattern, if the power capable of maintaining the first predetermined temperature is 600 W, the input power is selected so that the duty is 50%. At this time, if the power difference is large, for example, the maximum power 1200 W and the minimum power 0 W, the output fluctuation of the infrared sensor 80 due to the power fluctuation may increase, so the power difference between the maximum power and the minimum power is 400 W or less. Set as follows. By doing so, the output fluctuation of the infrared sensor 80 can also be suppressed while maintaining the first predetermined temperature.

  As shown in FIG. 4 and FIG. 5, the ripple width of the temperature can be suppressed to 5 ° C. or less by switching the strength of the input power at intervals of 3 seconds. For this reason, cooking which does not make a user feel a thermal power fall feeling can be performed. Here, for example, if it is 4 seconds or more and 10 seconds or less, the temperature ripple width can be within an allowable range that does not cause the user to feel the thermal power reduction, and the temperature change at the time of loading the food material can be easily discriminated. Can do.

  As shown in FIGS. 4 and 5, when the difference from the first predetermined temperature is large, the input power is fixed to 0 W, 1.5 kW, etc., so that the first predetermined temperature is quickly brought closer. be able to. Here, in the above description, the examples where the fixed power is 0 W and 1.5 kW are described, but other values such as 100 W and 1.8 kW may be used.

Embodiment 3 FIG.
The configuration of the induction heating cooker in the present embodiment is the same as that of the induction heating cooker described in the first embodiment. Moreover, FIG. 4 is used about the timing chart which shows the operation | movement of an induction heating cooking appliance. In the first and second embodiments described above, when it is determined that the temperature of the pan 100 has reached the first predetermined temperature, the pan 100 is controlled by switching the input power with the input power pattern including the strength. It was made to heat. In the present embodiment, a plurality of set temperatures lower than the first predetermined temperature are determined (six set temperatures are determined in FIG. 4). And if it judges that the temperature of the pan 100 was less than each preset temperature, the electric power corresponding to each preset temperature will be input and the pan 100 will be heated. Here, for the power corresponding to each set temperature, the input power is increased as the temperature difference between the first predetermined temperature and the set temperature is larger. The power to be supplied is not changed until it is determined that the temperature of the pan 100 is equal to or higher than the first predetermined temperature.

  As described above, according to the heating cooker of the third embodiment, a plurality of set temperatures that are lower than the first predetermined temperature are set, and if the temperature is lower than each set temperature, the temperature is equal to the first predetermined temperature. Since the pan 100 is heated by supplying power based on the width, the temperature of the pan 100, etc., which has been drastically lowered due to the input of ingredients, for example, is quickly returned to the first predetermined temperature when performing frying or the like. Can do.

Embodiment 4 FIG.
6 and 7 are diagrams showing a processing procedure of the control device 50 when the automatic deep-fried food menu according to the fourth embodiment of the present invention is selected. The configuration of the induction heating cooker in the present embodiment is the same as that of the induction heating cooker described in the first embodiment. The automatic frying menu automatically sets the temperature of the oil in the pan 100 manually by the user, and automatically controls the temperature of the oil until the material to be heated is fried as a fried food based on the set temperature of the oil. To do. For example, the temperature of the oil can be set in the range of 140 ° C. to 220 ° C. in increments of 10 ° C. If the user does not set, 180 ° C. is set.

  For example, when the user selects cooking in the automatic deep-fried food menu via the upper surface operation unit 22 and sets the oil temperature, the inverter 70 starts energizing the heating coil 61. At this time, first, initial detection is performed (S1). In the initial detection, as described above, it is determined whether or not the pan 100 is placed (S2). When it is determined that the pan 100 is placed, the material of the pan 100 is determined based on the difference in impedance due to the material of the pan 100 based on the current flowing through the heating coil 61 to determine whether the pan is a suitable pan. (S3). When it is determined that the pan is not placed in S2, or when it is determined that the pan is not a compatible pan in S3, energization to the heating coil 61 is stopped and heating is stopped (S12).

  Next, a preheating process is started (S4). During heating, the pan warpage amount determination means 52 determines the warpage amount of the pan 100 based on the temperature rise (temperature change) in a predetermined time (for example, 50 seconds) based on the temperature detected by the infrared sensor 80. To do. Moreover, it is judged whether the curvature amount of the pan 100 is larger than the temperature change showing the limit curvature amount (S5). If it is determined that the temperature change is equal to or less than the temperature change representing the limit warp amount, the warp amount corresponding to the temperature change is stored as data in the storage means (S6). Here, the amount of warpage of the pan 100 is determined based on the temperature change of the pan 100 immediately after the start of heating, which is not affected by the temperature of ingredients in the pan 100 or the like.

  Furthermore, the oil amount determination means 54 determines the amount of oil in the pan 100 based on the temperature change. Moreover, it is judged whether it is larger than the temperature change showing the minimum oil amount (S7). When it is determined that the temperature change is equal to or less than the temperature change representing the minimum oil amount, the oil amount corresponding to the temperature change is stored as data in the storage means (S8). Here, the amount of oil in the pan 100 can be determined based on a temperature change after a certain amount of time has elapsed since the pan 100 was heated. In S5 and S7, as the warpage amount of the pan 100 increases, it takes time until the temperature of the oil in the pan 100 is transmitted. As the amount of oil increases, the temperature rises when the power is reduced is small. Although the determination is made based on the temperature change, the determination may be made based on the determined warpage amount and oil amount.

  And it sets to the heating pattern according to the judged curvature amount and oil amount (S9). By setting the heating pattern according to the determined warpage amount, it is possible to perform optimum heating in consideration of the erroneous detection of the temperature related to the detection by the infrared sensor 80. Further, by adopting a heating pattern according to the determined oil amount, the temperature recovery time is shortened when the oil amount is large, and the oil can be safely heated while preventing ignition when the oil amount is small. On the other hand, if it is determined in S5 that it is greater than the temperature change representing the limit warpage amount, or if it is determined in S7 that the temperature change is greater than the minimum oil amount, energization of the heating coil 61 is stopped and heating is stopped (S12).

  And if it is judged that the pan temperature has reached the set oil temperature based on the temperature related to the detection by the infrared sensor 80 (S10), the notification means is notified that the preheating step is completed (S11), Complete the preheating process. As for the notification, the voice guidance such as “Oil temperature has reached an appropriate temperature. Please insert the ingredients” is given to the user via the voice synthesizer 34 and the speaker 35.

  When the preheating process is completed, the heat retaining process is started (S13). Also in the heat retaining step, control is performed with a heating pattern corresponding to the determined warpage amount and oil amount (S14). In the heat retaining step, heating control is performed so as to keep the temperature of the oil at the set temperature. The control device 50 determines whether the pan temperature is equal to or lower than the control temperature determined based on the set temperature based on the temperature related to the detection by the infrared sensor 80 (S15). If it is determined that the temperature has become lower than the control temperature, it is determined whether or not the temperature has dropped due to the addition of ingredients (loads) such as croquettes that have been frozen to the pan 100, and the loading is detected (S16). .

  FIG. 8 is a diagram showing the relationship between the amount of ingredients (load) to be charged, the temperature of the pan 100 (detected temperature), and the thermal power. As shown in FIG. 8, the temperature drop width is ΔT11 when the load amount is small, whereas the temperature drop width becomes ΔT12 when the load amount is large. Thus, as the load amount increases, the temperature drop width increases and the power supply also increases. For example, in FIG. 8, if there is a drop of ΔT1 with respect to the temperature T1, the heating power is increased.

  When detecting the input of the material, the control device 50 determines the weight (load amount) of the load (material) based on the temperature decrease width (S17). Then, the determined load weight is stored in the storage means as load amount data (S18). The control temperature is changed according to the load amount (S19). And it controls by the heating pattern according to curvature amount, oil amount, and load amount (S20). And it is judged whether it became more than the changed control temperature (S21). If it is determined that the temperature is lower than the changed control temperature, the process returns to S17 to perform control according to the load amount or the like. If it is determined that the temperature has reached the changed control temperature or higher, a heating power increasing step is performed to raise the heating power and finish the fried food (S22). And it is judged whether fried food cooking is complete | finished (S23). When it is determined that cooking of the deep-fried food is to be finished, the power supply to the heating coil 61 is stopped and the heating is stopped (S26).

  On the other hand, if it is determined in S16 that there is no temperature drop due to the input of the material (load) (material input is not detected), the heating pattern corresponding to the determined amount of warpage and oil amount will be equal to or higher than the control temperature. The heating is controlled (S24). And it is judged whether it is more than control temperature (S25). If it is determined that the temperature is lower than the control temperature, the process returns to S16 to perform processing. If it is determined that the temperature is equal to or higher than the control temperature, the process returns to S14, and control is performed with a heating pattern corresponding to the determined warpage amount and oil amount.

  FIG. 9 is a diagram showing an example of an energization control pattern in the automatic deep-fried food menu according to Embodiment 4 of the present invention. Here, based on FIGS. 6-8, operation | movement of the induction heating cooking appliance etc. when fried food cooking is selected from a cooking menu are demonstrated. When the user selects a cooking menu for automatic fried food cooking, the control device 50 sequentially executes a preheating step, a fried food cooking step, and a heating power up step as described above.

  First, in the preheating step, when the set oil temperature of the user's oil is 180 ° C., in the preheating step, driving of the inverter 70 is started with a predetermined input power (maximum 1500 W), and electric power is supplied to the heating unit 60. By heating the pan 100, the temperature of the oil rapidly rises from room temperature (for example, 20 ° C.) to the target temperature T1 of 180 ° C.

  About the temperature of the pan 100 mentioned above, the temperature determination means 51 is monitoring in real time based on the detection of the infrared sensor 80. FIG. When the temperature determination unit 51 determines that the set temperature T1 (first temperature) has reached 180 ° C., the control device 50 controls the induction heating amount, that is, the inverter 70, as described in the first embodiment. Then, the heat insulation process is started.

  And the oil in the pan 100 is rapidly cooled by a user's load input. For this reason, temperature falls rapidly. However, since the temperature determination means 51 monitors such a temperature drop, power is immediately supplied from the inverter 70, and is heated to a predetermined input power 1500W or 1800W. Thereby, the temperature of the oil in the pan 100 rises again (temperature feedback control). In this way, when the target temperature T1 is reached again (or when a predetermined time has elapsed), the fried food cooking process shifts to the heating power increasing process.

  In the heating-up process, the control device maintains the oil temperature between 225 ° C. of the second temperature T2 higher than the set temperature T1 and 230 ° C. of the upper limit temperature (third temperature) T3 higher than this. 50 controls the inverter 70. At this time, as shown in FIG. Here, the process after reaching the third temperature T3 is referred to as a “fried food finishing process”, which is an important process for finishing the fried food. Deep-fried food can be made well by cooking with sufficient power input in the heating up process.

  Here, as shown in FIG. 9, in the cooking menu for automatic fried food cooking, the process from the heat insulation process to the heating power up process is defined as the “priority cooking menu execution time zone”. Do not reduce power. For this reason, the control device 50 always keeps track of whether or not it is being executed in the “priority cooking menu execution time zone”, and if it is in the execution time zone, it notifies the outside.

  As described above, according to the induction heating cooker of the fourth embodiment, in automatic fried food cooking, it is possible to accurately determine a temperature variation (temperature decrease) due to the input of ingredients and to speed up the temperature recovery and the like. The finish of fried food can be made crisp. At this time, by setting the heating pattern according to the warp amount of the pan 100 determined by the warp amount determination unit 52 and the oil amount in the pan 100 determined by the oil amount determination unit 54, it is possible to take into account erroneous temperature detection and oil. Deep-fried food can be cooked while ensuring safety and the like without overheating.

  The heating cooker according to the present invention can accurately detect the input of ingredients in fried food cooking, frying pan cooking, and the like by performing control with a heating pattern that keeps the temperature of the object to be heated constant. . For this reason, it can be applied not only to the induction heating cooker described in the first embodiment but also to other heating heating cookers. In addition, it can be widely used in a stationary induction cooker or a built-in cooker dedicated to an induction heating type heat source and a combined induction heating cooker with other radiation type heat sources.

  DESCRIPTION OF SYMBOLS 1 Main body case, 10 Top plate, 11 Light-shielding means, 12 Main power switch, 13, 13L, 13R Heating port, 20 Operation panel, 21L, 21R dial, 22 Upper surface operation part, 30 Center display panel, 31L, 31R Display panel, 32L, 32R Display unit, 33 Display unit drive circuit, 34 Speech synthesizer, 35 Speaker, 41 Grill door, 42 Grill box, 43 Dish pan, 44 Grill net, 46 Handle, 47 Air intake port, 48 Air exhaust port, 50 Control device, 51 Temperature determination means, 52 Warpage amount determination means, 53 Bottom thickness determination means, 54 Oil amount determination means, 55 Emissivity determination means, 56 Power supply circuit, 60, 60L, 60R heating unit, 61, 61L, 61R Heating coil, 62L 62R Resonance condenser, 63 Radiation type electric heater, 64 Catalyst heater, 70, 7 L, 70R inverter, 71 grill heater drive circuit, 72 a catalyst heater drive circuit, 80 an infrared sensor, 81 contact temperature sensor, 100 pots, 200 AC power supply.

Claims (15)

Heating means for heating the cooking vessel;
Control means for controlling the heating means so that the temperature of the cooking container is constant;
Temperature detecting means for detecting the temperature of the cooking container,
The control means includes a temperature range near a first predetermined temperature set as a target temperature for maintaining the temperature of the cooking container, a temperature range higher than the first predetermined temperature, and a temperature lower than the first predetermined temperature. Set multiple preset temperatures in advance,
When the temperature detecting means determines that the temperature is in the temperature range near the first predetermined temperature, the heating is performed with the first heating amount that is set to an extent that the temperature can be maintained,
When the temperature detection means determines that each set temperature has been exceeded in a temperature range higher than the first predetermined temperature, the first set temperature is set so as to decrease as the temperature difference between the first predetermined temperature and each set temperature increases. Heating at a heating amount smaller than the heating amount of 1,
When the temperature detecting means determines that the temperature is lower than each set temperature in a temperature range lower than the first predetermined temperature, the first temperature is set so as to increase as the temperature difference between the first predetermined temperature and each set temperature increases. Heating with a heating amount greater than 1,
Each heating amount is controlled to heat the cooking container by an input power pattern configured by combining at least two different types of power,
When lowering the first heating amount to a second heating amount that is smaller than the first heating amount, at least one of the two or more different types of electric power is the first heating amount. Input power pattern that includes less power than included power,
When the first heating amount is increased to a third heating amount that is larger than the first heating amount, at least one of the two or more different types of electric power is the first heating amount. The heating cooker characterized by performing control which heats the said cooking container so that it may reach said 1st predetermined temperature by setting it as the input electric power pattern containing electric power larger than electric power to contain. The input power pattern is
In the case of lowering the first heating amount to a second heating amount smaller than the first heating amount, a pattern is started from the minimum power among the two or more different types of power,
In the case where the first heating amount is increased to a third heating amount that is larger than the first heating amount, the pattern is started from the maximum power among the two or more different types of power. The cooking device according to claim 1.   The heating cooker according to claim 1 or 2, wherein the input power pattern of two or more kinds of electric power by the control means has a period between 4 seconds and 10 seconds.   The maximum power of one input power pattern of two or more types of power by the control means when maintaining a predetermined temperature is the power at which the temperature of the cooking container continues to rise slowly if the power is kept constant, The minimum power of the input power pattern is a power in which the temperature of the cooking container keeps decreasing slowly when the power is kept constant, and the difference between the maximum power and the minimum power is 400 W or less. The cooking device according to any one of claims 1 to 3.   The temperature detected by the temperature detection means is fixed to the maximum power in the cooking mode when the temperature is equal to or higher than the maximum temperature among the preset temperatures preset by the control means. The cooking device according to any one of 4.   The power is fixed at 0 W when the temperature detected by the temperature detecting means is not more than the lowest temperature among the preset temperatures preset by the control means. The heating cooker according to item.   7. The pan warpage determination means for determining a warpage amount of the cooking container and performing a process of changing the input power pattern based on the warpage amount. Cooking device.   The bottom thickness determination means which determines the bottom thickness of the said cooking container, and performs the process which changes the said input electric power pattern based on the said bottom thickness is provided, The any one of Claims 1-7 characterized by the above-mentioned. Cooking device.   The oil amount determination means which performs the process which determines the oil amount in the said cooking vessel, and changes the said input electric power pattern based on the said oil amount is further provided in any one of Claims 1-8 characterized by the above-mentioned. The cooking device described. It further comprises a top plate for placing the cooking container,
The top plate has crystallized glass that transmits infrared rays, and the temperature detecting means is disposed on the bottom surface of the top plate and detects infrared rays radiated from the bottom surface of the cooking vessel via the top plate. The cooking device according to any one of claims 1 to 9, wherein the cooking device is a cooking device.   The cooking device according to claim 10, further comprising a band pass filter that covers a light receiving surface of the infrared sensor and has a light transmission characteristic of a predetermined band.   The heating cooker according to claim 10, further comprising a filter having the same light transmission characteristics as that of the crystallized glass, in front of an infrared receiving surface of the infrared sensor.   The emissivity determination means which performs the process which determines the emissivity of the said cooking container based on the detection of the said infrared sensor, and changes the said input electric power pattern based on the said emissivity is further provided. The cooking device according to any one of 12 above.   The temperature detection means is further provided with a thermistor for detecting the temperature of the top plate, and the temperature is derived using a correction formula for subtracting the temperature component of the top plate detected by the thermistor from the temperature detected by the infrared sensor. The cooking device according to any one of claims 10 to 13, characterized in that:   The heating cooking program which makes a computer perform the process which concerns on the control which the control means of the heating cooker of any one of Claims 1-14 performs.

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