CN111052860A - Heating cooker - Google Patents
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- CN111052860A CN111052860A CN201980003783.XA CN201980003783A CN111052860A CN 111052860 A CN111052860 A CN 111052860A CN 201980003783 A CN201980003783 A CN 201980003783A CN 111052860 A CN111052860 A CN 111052860A
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- top plate
- heating cooker
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
Abstract
A heating cooker, comprising: a main body having a top plate on which a container for accommodating a cooking material is placed, a heating unit for heating the container, and a heating control unit for controlling a heating output of the heating unit; and a temperature detection module having a temperature detection unit for detecting a temperature distribution on the top plate from above the top plate. The heating control unit controls heating output based on the temperature distribution detected by the temperature detection unit, and the temperature detection unit has a plurality of temperature detection elements each detecting temperature information. The heating cooker further includes a temperature distribution correcting unit for correcting the temperature distribution detected by the temperature detecting unit based on temperature information of a plurality of specific portions on the top plate.
Description
Technical Field
The present disclosure relates to a heating cooker, and more particularly, to a heating cooker having a function of detecting a temperature of an object to be heated.
Background
Conventionally, the heating power of a heating cooker is adjusted according to the temperature of a pan bottom. The temperature of the pot bottom is detected by a temperature detection element disposed below the plate. However, when a temperature difference occurs between the temperature in the pan and the temperature of the bottom of the pan, a delay occurs in the transmission of the detected temperature. For example, when the temperature of the pot is lowered by charging the food material into the pot, it takes time to return to the original temperature, and the heating power control becomes unstable such as scorch may occur at high temperature.
Therefore, for example, in the heating cooker of patent document 1, a detachable temperature detection device is disposed in the duct. The temperature detection device can communicate with the heating cooker and detect the temperature of the object to be heated from above.
The heating cooker of patent document 1 adjusts the installation position of the temperature detection device using an infrared light emitting element mounted on a temperature detection element disposed above. The infrared rays emitted from the infrared ray emitting elements are received by a plurality of communication units disposed below a plate of the heating cooker. The position of the temperature detection element is calculated from the difference in the amount of light received in each communication unit.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2015-106462
Disclosure of Invention
However, in the conventional method, infrared rays emitted from the temperature detection module disposed above the cooking device must be received by the heating cooking device disposed below the cooking device, and therefore, there is a problem that the installation location of the temperature detection module is limited to the position directly above the heating cooking device.
Accordingly, the present disclosure provides a heating cooker capable of improving the degree of freedom of the installation position of the temperature detection module.
A heating cooker according to one embodiment of the present disclosure includes: a main body having a top plate on which a container for containing a cooking material is placed, a heating unit for heating the container, and a heating control unit for controlling a heating output of the heating unit; and a temperature detection module having a temperature detection unit that detects a temperature distribution on the top plate from above the top plate.
The heating control unit controls the heating output based on the temperature distribution detected by the temperature detection unit, the temperature detection unit includes a plurality of temperature detection elements each detecting temperature information, and the heating cooker further includes a temperature distribution correction unit correcting the temperature distribution detected by the temperature detection unit based on the temperature information of a plurality of specific portions on the top plate.
With this configuration, it is possible to provide a heating cooker capable of improving the degree of freedom of the installation position of the temperature detection module.
Drawings
Fig. 1 is a perspective view of a heating cooker according to an embodiment of the present invention.
Fig. 2 is a plan view of the heating cooker.
Fig. 3 is a schematic view showing the installation state of the heating cooker.
Fig. 4 is a block diagram showing a control system of the heating cooker.
Fig. 5 is an explanatory diagram showing a detection pixel region of the temperature sensor.
Fig. 6 is a graph showing a change in detected temperature corresponding to a distance.
Fig. 7 is an explanatory view showing a detection pixel region of the temperature detection unit provided directly above.
Fig. 8 is an explanatory view showing a detection pixel region of the obliquely arranged temperature detection portion.
Fig. 9 is an explanatory diagram for explaining the relationship in size between the measurement object and the detection pixel.
Fig. 10 is an explanatory diagram illustrating a size relationship between the measurement object and the detection pixel.
Fig. 11 is a flowchart showing the flow of temperature correction coefficient calculation.
Fig. 12 is a flowchart showing the flow of temperature distribution correction.
Fig. 13 is an explanatory diagram showing an example of the arrangement of a part of a human body at the time of positioning of the temperature detection module.
Fig. 14 is an explanatory diagram showing an example of a thermal image in a case where the temperature detection module is far away.
Fig. 15 is an explanatory diagram showing an example of a thermal image in a case where the distance of the temperature detection module is short.
Fig. 16 is an explanatory view showing an example of a top plate having a region where an object having a temperature different from the ambient temperature is placed.
Detailed Description
(example of embodiment of the present disclosure)
A heating cooker according to one embodiment of the present disclosure includes: a main body having a top plate on which a container for containing a cooking material is placed, a heating unit for heating the container, and a heating control unit for controlling a heating output of the heating unit; and a temperature detection module having a temperature detection unit that detects a temperature distribution on the top plate from above the top plate.
The heating control unit controls the heating output based on the temperature distribution detected by the temperature detection unit, the temperature detection unit includes a plurality of temperature detection elements each detecting temperature information, and the heating cooker further includes a temperature distribution correction unit correcting the temperature distribution detected by the temperature detection unit based on the temperature information of a plurality of specific portions on the top plate.
The plurality of temperature detection elements may be arranged in an array (in a state of being arranged vertically and horizontally in a plan view).
Further, the temperature distribution correcting unit may correct the temperature distribution for the plurality of specific portions at the same temperature based on a difference in the temperature information of the plurality of specific portions detected by the plurality of temperature detecting elements.
In addition, the temperature distribution correction unit may detect distortion in the detection regions of the plurality of temperature detection elements based on a difference in the temperature information detected by the plurality of temperature detection elements, and correct the temperature distribution based on the detected distortion.
Further, the heating cooker may further include a temperature adjustment unit that heats or cools the specific portion of the top plate, and the temperature distribution correction unit may correct the temperature distribution based on temperatures of a plurality of specific portions of the top plate that have been heated or cooled.
Further, the heating coil may heat the plurality of specific portions of the top plate, and the temperature distribution correcting unit may correct the temperature distribution based on temperature information of the plurality of specific portions of the heated top plate.
In addition, the plurality of specific portions to be heated or cooled may be arranged outside the area of the heating section (area different from the area of the heating section) in a plan view.
In addition, the plurality of specific portions may be a plurality of objects placed on the top plate and having different temperatures from the ambient temperature, and the temperature distribution detected by the temperature detection portion may be corrected based on the temperatures of the plurality of objects.
In addition, the cooking device may include a plurality of the heating units, and the specific portions may be the containers on the top plate heated by the plurality of the heating units.
The heating cooker includes an operation unit connected to the heating control unit to set an amount of heating, and the plurality of specific portions are a plurality of work areas for a user to operate the operation unit.
In addition, the temperature distribution correction unit may calculate a temperature correction coefficient for each of the temperature detection elements based on the distortion, the heating cooker may include a storage unit in which the temperature correction coefficient is stored, and the temperature distribution correction unit may correct the temperature distribution using the temperature correction coefficient stored in the storage unit.
The temperature detection unit may increase a gain of temperature detection when calculating the temperature correction coefficient.
Further, the heating unit may include a heating coil that generates the induction magnetic field to heat the container, and the heating control unit may supply a high-frequency current to the heating coil to heat the container.
(embodiment mode)
A heating cooker according to an embodiment of the present disclosure will be described below with reference to fig. 1 to 4. Fig. 1 is a perspective view of a heating cooker 1 according to an embodiment of the present disclosure. Fig. 2 is a plan view of heating cooker 1 of the embodiment. Fig. 3 is a schematic diagram showing a setting state of the heating cooker. Fig. 4 is a block diagram showing a control system of the heating cooker 1. In the drawings, the X-axis direction represents the longitudinal direction (left-right direction) of the heating cooker, the Y-axis direction represents the front-rear direction, and the Z-axis direction represents the height direction. In addition, the positive direction of the X axis is the right direction, and the negative direction is the left direction.
As shown in fig. 1, a heating cooker 1 includes: a main body 3; and a top plate 5 on which the container Cr is placed as an upper side portion of the main body 3. The container Cr contains an object to be cooked Tc such as a stew.
In the case of the embodiment, the heating cooker 1 is an induction heating cooker, and heating coils 7A, 7B, and 7C are disposed as heating portions of the heating cooker 1 in the body 3 below the container placement region in the top plate 5. Ring-shaped marks 8A, 8B, and 8C indicating container placement areas are printed on the top plate 5 above the corresponding heating coils 7A, 7B, and 7C, respectively (see fig. 2).
The heating coils 7A to 7C generate an induction magnetic field to heat the container Cr. As shown in fig. 3 and 4, a coil control unit 10, which is an example of a heating control unit, supplies a high-frequency current to the heating coils 7A to 7C to heat the container Cr. The coil control unit 10 controls the amount of heat supplied from the heating coils 7A to 7C by controlling the amount of current flowing through the heating coils 7A to 7C.
As shown in fig. 2, light emitting units 6A, 6B, and 6C that emit light annularly are disposed on the top plate 5 on the outer sides of the heating coils 7A, 7B, and 7C, respectively, in a plan view. The light emitting units 6A, 6B, and 6C emit light when, for example, a current flows through the corresponding heating coils 7A, 7B, and 7C. Each of the light emitting units 6A to 6C has, for example, an LED (light emitting diode) light emitting substrate.
As an operation unit for the user to operate the heating coils 7A to 7C, a plurality of operation input units 9A, 9B, and 9C are arranged on the front side of the top plate 5 of the heating cooker 1. The operation input units 9A to 9C may be touch keys or touch panels, for example. The operation input unit 9A corresponds to the heating coil 7A, the operation input unit 9B corresponds to the heating coil 7B, and the operation input unit 9C corresponds to the heating coil 7C.
The operation input units 9A to 9C as operation units are connected to the coil control unit 10 as a heating control unit, and set the heating amount. For example, the coil control unit 10 controls the start or stop of heating of the heating coil 7A in accordance with an operation instruction from the operation input unit 9A. The coil control unit 10 adjusts the heating level of the heating coil 7A to 4 stages, for example, in accordance with the operation instruction of the operation input unit 9A. The same applies to the functions of the other operation input units.
As shown in fig. 4, the main body 3 includes a notification unit 4, and the notification unit 4 notifies information on heating of the heating coils 7A to 7C. The notification unit 4 includes a display unit 11 and a sound output unit 15 (see also fig. 1). Display unit 11 is disposed on the front side of top plate 5 of heating cooker 1, and displays the heating levels of heating coils 7A to 7C. The display unit 11 is, for example, a black-and-white liquid crystal panel having a band shape extending in the longitudinal direction (left-right direction) of the top plate 5, but may be a color liquid crystal panel. Sound output unit 15 is disposed on the front surface side of cooking device 1, and outputs sound guidance to the user. The sound output unit 15 is, for example, a speaker.
In order to set heating of heating coils 7A to 7C in detail, setting unit 13 is provided on the front surface side of main body 3 of heating cooker 1. The setting unit 13 includes: a setting key 13a connected to the control unit 25, capable of moving in and out of the main body 3, for setting heating of the heating coils 7A to 7C in detail; and a setting display unit 13b for displaying the setting contents and the detailed states of the heating coils 7A to 7C (see fig. 1). The setting unit 13 sets heating temperatures, heating times, timers, and the like of the heating coils 7A to 7C.
A hood 17 is provided above the heating cooker 1. The hood 17 sucks air above the heating cooker 1 into the inside through a hood portion 17a provided at a lower portion, and discharges the air from a discharge port communicating with the outside.
The heating cooker 1 further includes a temperature detection module 19, and the temperature detection module 19 detects the temperature of the object to be heated Tc on the top plate 5 from above. The temperature detection module 19 is disposed at a position away from the top plate 5, and is detachably attached to, for example, a cover portion 17a of the hood 17 or a wall 18 (see fig. 3) extending upward from the rear or side of the body 3. Specifically, the temperature detection module 19 is attached by a magnet, an adhesive material, a clip, or the like. The temperature detection module 19 may be disposed in a ventilation fan, a duct, or a ceiling plate.
The main body 3 has a 1 st communication part 21, and the temperature detection module 19 has a 2 nd communication part 23 for wireless communication between the main body 3 and the temperature detection module 19 (refer to fig. 4). The temperature information detected by the temperature detection module 19 is transmitted from the 2 nd communication unit 23 and received by the main body 3 through the 1 st communication unit 21.
The 1 st communication unit 21 and the 2 nd communication unit 23 each have an antenna, and are wirelessly connected by wireless communication such as Wi-Fi (registered trademark), Bluetooth (registered trademark), BLE (Bluetooth Low Energy), or the like. The 1 st communication unit 21 and the 2 nd communication unit 23 may not be provided, and the main body 3 and the temperature detection module 19 may be connected by a wire.
The heating cooker 1 includes a control unit 25 and a storage unit 27 inside the main body 3. The control Unit 25 is a Processing device such as a CPU (Central Processing Unit) or a microprocessor, and is configured to perform various functions described later by executing a program stored in a storage Unit 27 such as a ROM (Read Only Memory), a RAM (Random Access Memory), a hard disk, or an SSD (Solid State Drive).
The control unit 25 includes a temperature information processing unit 25 a. The temperature information processor 25a determines the state of the object Tc based on the temperature information transmitted from the temperature detection module 19. The state of the object Tc to be heated includes a normal state, a boiling state, a boil-over precursor state, and a boil-over state. When the temperature information processing unit 25a determines, for example, that the boil-over precursor state is the state of the object to be heated, the control unit 25 instructs the coil control unit 10 to stop controlling the heating of the corresponding heating coil. Thus, the coil control unit 10 can stop heating from the corresponding heating coil among the heating coils 7A to 7C, and prevent boiling-over from occurring.
The temperature detection module 19 has a temperature detection unit 29, a control unit 31, a storage unit 33, and a power storage unit 35. The temperature detection unit 29 includes: a temperature sensor 29a that detects a temperature distribution on the top plate 5 in a visual field from above; and an amplifier 29b that amplifies the detection signal of the temperature sensor 29 a. The temperature sensor 29a is, for example, an infrared sensor or a thermal image camera. The thermal image detected by the temperature detector 29 includes information on the temperature distribution on the top plate 5. The temperature sensor 29a can image the entire top panel 5 from above if set to an appropriate imaging direction.
The distance from the temperature sensor 29a to the top plate 5 is, for example, 600mm or more and 2000mm or less. As shown in fig. 5, the temperature sensor 29a of the temperature detection unit 29 has detection pixels as a plurality of temperature detection elements arranged in an array (in a state where a plurality of elements are arranged in the vertical and horizontal directions in a plan view). The temperature sensor 29a according to the embodiment is, for example, an array type temperature sensor having 64 detection pixels 29aa to 29hh of 8 vertical lines × 8 horizontal lines.
The control unit 31 is a processing device such as a CPU or a microprocessor, and is configured to perform various functions described later by executing programs stored in the storage unit 33 such as a ROM, a RAM, a hard disk, or an SSD.
The control unit 31 includes: an attachment determination unit 31a that determines whether or not the measurement direction of the temperature sensor 29a of the temperature detection unit 29 faces the top plate 5 vertically; and a temperature distribution correcting unit 31b for correcting temperature information as the temperature distribution detected by the temperature detecting unit 29. The control unit 31 and the storage unit 33 may be mounted on the main body 3.
The power storage unit 35 supplies power to the temperature detection unit 29, the control unit 31, the storage unit 33, and the 2 nd communication unit 23, respectively. The power storage unit 35 is, for example, a battery.
In order to correct the temperature distribution detected by the temperature sensor 29a, it is necessary to know in which state the temperature detection unit 29 is attached. Therefore, a region having a temperature higher or lower than the ambient temperature is formed in the top plate 5 in advance. For example, regions having a temperature higher or lower than the ambient temperature are formed at a plurality of specific portions on the top plate 5, and the temperature detection portion 29 is caused to detect the regions of the specific portions. Since the positional relationship of the plurality of specific portions can be predicted in advance, the temperature distribution correcting unit 31b can calculate the mounting angle of the temperature detecting unit 29 by geometric calculation.
A temperature adjustment unit 55 (connected to the coil control unit 10) that heats or cools a specific region 57 (see fig. 2) that is a specific portion on the top plate 5 is disposed at a lower portion of the top plate 5 (see fig. 3). Examples of the temperature adjusting unit 55 for heating include an electric heater. The temperature adjustment unit 55 for cooling includes, for example, a peltier element.
As shown in fig. 2, the temperature adjustment unit 55 can generate a specific region 57 having a temperature different from the ambient temperature on the top plate 5. The temperature in the specific region 57 different from the ambient temperature is used by the corrected temperature detecting section 29 to detect the temperature distribution on the top plate 5. The temperature distribution correcting unit 31b corrects the temperature distribution based on the temperature of the specific region 57 of the top plate 5 after being heated or cooled. A plurality of specific regions 57 are provided spaced apart from each other. The plurality of specific regions 57 is not limited to 2, and may be provided in an amount of 3 or more. The specific region 57 may be provided at 4 corners of the top plate 5, for example.
In the present embodiment, the temperature adjustment unit 55 is disposed outside the regions of the heating coils 7A to 7C (regions different from the regions of the heating coils) in plan view. Therefore, the region of the top plate 5 heated by the heating coils 7A to 7C does not overlap with the specific region 57 temperature-adjusted by the temperature adjuster 55. Thus, the specific region 57 as the specific portion to be heated or cooled is arranged outside the region of the heating coils 7A to 7C as the heating portion. Thus, the temperature detector 29 can appropriately detect the temperature of the specific region 57.
The heating coils 7A to 7C serving as heating portions may also function as the temperature adjustment portion 55. The heating coils 7A to 7C may heat a specific portion of the top plate 5, and the temperature distribution correcting unit 31b may correct the temperature distribution based on the temperature of the heated specific portion of the top plate 5. Specifically, when high-frequency current is supplied to the heating coils 7A to 7C, joule heat is generated by the resistance of the heating coils themselves, and the temperature of the heating coils 7A to 7C rises. This heat is propagated as radiation heat to the top plate 5, and the temperature of a specific portion of the top plate 5 above the heating coils 7A to 7C rises. Thus, the temperature of a specific portion on the top plate 5 is higher than the ambient temperature of the other portions. The temperature may be detected by the temperature detector 29 to correct the temperature distribution on the top plate 5.
Next, the characteristics of the infrared temperature sensor used as the temperature sensor 29a will be described. Since the temperature sensor 29a detects the temperature by infrared rays, the detected temperature decreases as the distance from the temperature detection module 19 to the top plate 5 increases. In addition, the detected temperature also varies depending on the angle between the temperature detection module 19 and the measurement object.
Refer to fig. 6. Fig. 6 is a graph showing a change in the detected temperature with time corresponding to the distance.
In accordance with the change in the temperature profile TW of the water contained in the container Cr, a temperature profile TL detected by the detection pixels of the temperature sensor 29a having a short distance to the container Cr and a temperature profile TH detected by the detection pixels of the temperature sensor 29a having a long distance to the container Cr are shown. At the point in time when the temperature curve TW reaches the boiling point of 100 ℃, the temperature of the temperature curve TL is the temperature Tp2, and the temperature of the temperature curve TH is the temperature Tp 3. The relationship between the temperature Tp2 and the temperature Tp3 is Tp3< Tp2< 100. When the temperature sensor 29a is provided so as to have an inclination angle, a deviation occurs in the distance to the measurement object of each detection pixel. This causes variations in the accuracy of temperature detection among the detection pixels of the temperature sensor 29 a. The detection temperature of the detection pixel having a long distance to the measurement object is lower than the actual temperature.
Another reason why the temperature sensor 29a is different from the temperature detected when it is directly opposite to the heating cooker 1 and when it has an inclination angle will be described. As shown in fig. 3, when the temperature detection module 19 (broken line) is attached to the vicinity of the center portion of the top plate 5 in a plan view of the cover portion 17a, that is, when the temperature detection module is provided directly above the heating cooker 1, the measurement direction of the temperature detection unit 29 faces the top plate 5 vertically. In this case, as shown in fig. 7, the detection pixels 29aa to 29hh of the temperature sensor 29a can uniformly detect the temperatures of the regions having the same area without distortion. Fig. 7 shows regions (visual field ranges) in which the detection pixels 29aa to 29hh detect temperatures, respectively.
On the other hand, as shown in fig. 3, when the temperature detection block 19 (solid line) is installed on, for example, the wall 18 and the measurement target is observed obliquely, as shown in fig. 8, one of the detection pixels (for example, the detection pixels 29aa and 29ha) close to the temperature detection block 19 has a small distortion and a small area as the measurement target. In contrast, the detection pixels (for example, the detection pixels 29ah and 29hh) on the side away from the temperature detection block 19 have a large distortion and a large area to be measured.
The temperature detected by the temperature detection module 19 is an average temperature of the visual field range detected by each detection pixel. As shown in fig. 9, for example, when the measurement target Mb is larger than the visual field range of the detection pixel 29hh, the average temperature of the visual field range of the detection pixel 29hh is equal to the temperature of the measurement target Mb, and therefore, no temperature error occurs. However, as shown in fig. 10, when the measurement target Mb is smaller than the visual field range of the detection pixel 29hh, the average temperature of the visual field range of the detection pixel 29hh is different from the temperature of the measurement target Mb, and therefore, a detection error occurs. In the case where the specific region 57 is cooled, the idea of averaging when the measurement target is small is opposite to the case of heating.
In the temperature detected by the temperature detection module 19, a temperature error occurs in a detection pixel having a large distance to the measurement object due to both an error caused by the large distance and a field-of-view error (area) caused by distortion of a detection region when the measurement object is observed obliquely as in the case of being provided on the wall 18. Therefore, it is preferable to determine whether the wall 18 is provided or is provided directly above, and perform correction corresponding to the state.
Therefore, at the time of initial setting of the temperature detection module 19 and at the time of resetting based on battery replacement, the mounting state of the temperature detection module 19 to the hood 17 or the wall 18 is determined, and the temperature distribution detected by the temperature detection unit 29 is corrected according to the mounting state.
Refer to fig. 4. If the temperatures detected by the plurality of specific regions 57 of a predetermined temperature on the top panel 5 are the same, the attachment determination unit 31a of the control unit 31 determines that there is no distortion of each detection pixel of the temperature sensor 29 a. Here, the same detected temperatures of the plurality of specific regions 57 also includes the case where the detected temperatures are within a predetermined temperature difference. As a result, it can be determined that the temperature detection unit 29 is attached so as to face the top plate 5. When the temperatures detected by the plurality of specific regions 57 are different from each other, it is determined that distortion occurs in each detection pixel of the temperature sensor 29 a. As a result, it can be determined that the temperature detection unit 29 is attached to the top plate 5 at an angle inclined thereto.
The temperature distribution correcting unit 31b corrects the temperature distribution detected by the temperature detecting unit 29 based on the temperature of the specific region 57, which is a plurality of specific portions on the top plate 5. The temperature distribution correction unit 31b includes a distortion detection unit 31ba, a mounting angle calculation unit 31bb, a distance calculation unit 31bc, and a temperature correction unit 31 bd.
The distortion detection section 31ba detects distortion of the detection pixels of the temperature sensor 29 a. The mounting angle calculation unit 31bb calculates the mounting angle of the temperature detection unit 29 based on the distortion of the detection pixels. The distance calculator 31bc calculates the distance from the temperature sensor 29a to the measurement target region on the top plate 5 based on the mounting angle of the temperature detector 29. The temperature correction unit 31bd corrects the temperature distribution based on the calculated distance between the detection pixels of the temperature sensors 29 a.
The distortion detection unit 31ba detects distortion of each detection pixel of the temperature sensor 29 a. The distortion factor of each detection pixel of the temperature sensor 29a is calculated from the difference between the set temperature and the detection temperature of the plurality of specific regions 57.
The mounting angle calculation unit 31bb calculates the mounting angle of the temperature detection unit 29 by geometric calculation based on the distortion rate of each detection pixel of the temperature sensor 29 a. The installation angle is an angle with respect to the perpendicular line of the top plate 5.
When it is determined that the temperature detection unit 29 is obliquely attached, the distance calculation unit 31bc calculates the distances from the detection pixels 29aa to 29hh of the temperature sensor 29a to the respective measurement target regions on the top 5 by geometric calculation based on the calculated attachment angle of the temperature detection unit 29.
When it is determined that the temperature detector 29 is attached so as to face the top plate 5, the distance calculator 31bc calculates the distance from the temperature sensor 29a to the top plate 5 based on the difference between the set temperature and the detected temperature of the specific region 57. The distance calculation unit 31bc further calculates the temperature correction coefficients of the detection pixels 29aa to 29hh based on the calculated distance. The calculated temperature correction coefficients are stored in the storage unit 33.
The temperature correction unit 31bd corrects the temperatures detected by the detection pixels 29aa to 29hh using the calculated temperature correction coefficients of the detection pixels 29aa to 29hh, respectively, thereby correcting the temperature distribution detected by the temperature detection unit 29.
Next, a flow of calculating the temperature correction coefficient of each detection pixel of the temperature correction unit 31bd will be described with reference to fig. 11. First, when the installation of the temperature detection module 19 is completed, the user performs the input of the installation completion through the setting key 13 a. When the information of the completion of the mounting is input, the control unit 25 requests the temperature detection module 19 to acquire the temperature information. The control unit 25 controls the temperature of the specific region 57 to a predetermined temperature by the temperature adjustment unit 55.
In step S11, the temperature sensor 29a acquires the temperature distribution on the top plate 5. This enables temperature information of the plurality of specific regions 57 to be acquired.
In step S12, the attachment determination unit 31a determines whether or not the detected temperatures of the plurality of specific regions 57 are the same. When the attachment determining unit 31a determines that the plurality of detected temperatures are the same (yes in S12), in step S13, the distance calculating unit 31bc calculates the distance between the temperature sensor 29a and the top plate 5 based on the difference between the set temperature and the detected temperature of the specific region 57. From the calculated distance, the temperature correction coefficient of the temperature sensor 29a is calculated. The calculated temperature correction coefficient is stored in the storage unit 33.
When the attachment determination unit 31a determines that the temperatures detected by the plurality of specific regions 57 are not the same (no in S12), in step S14, the distortion detection unit 31ba detects the distortion rate of the visual field region of the detection pixel of each of the temperature sensors 29a that detect the temperatures of the plurality of specific regions 57.
In step S15, the attachment angle calculation unit 31bb calculates the attachment angle of the temperature detection unit 29 based on the distortion factor of the visual field region of each detection pixel.
In step S16, the distance calculation unit 31bc calculates the distance from each detection pixel of the temperature sensor 29a to the corresponding detection region on the top 5 based on the calculated attachment angle.
In step S17, the distance calculation section 31bc further calculates a temperature correction coefficient that corrects the temperature information of each detection pixel, based on the distance to the calculated detection region of each detection pixel. The calculated temperature correction coefficient is stored in the storage unit 33.
Next, a control flow for preventing boil-over from occurring in the vessel Cr will be described with reference to fig. 12. First, when a heating instruction is input to any one of the heating coils 7A to 7C through any one of the operation input units 9A to 9C of the main body 3, the control unit 25 requests the control unit 31 of the temperature detection module 19 to acquire temperature information.
In step S21, the temperature sensor 29a acquires the temperature distribution on the top plate 5 as temperature information.
In step S22, the temperature correction unit 31bd of the control unit 31 corrects the acquired temperature information of each detection pixel using the temperature correction coefficient stored in the storage unit 33. This makes it possible to correct the detected temperature distribution.
In step S23, the information on the corrected temperature distribution is transmitted from the 2 nd communication unit 23 to the 1 st communication unit 21 and received by the temperature information processing unit 25a of the control unit 25. The temperature information processor 25a determines the state of the object Tc based on the received information of the temperature distribution.
In step S24, the temperature information processing unit 25a of the control unit 25 determines whether or not the absolute value or the amount of change per unit time of the detected temperature of the coil region corresponding to each of the heating coils 7A to 7C in the information of the temperature distribution is equal to or greater than a predetermined threshold value. For example, if the absolute value or the amount of change per unit time of the detected temperature TA of the coil region is smaller than the threshold Tp1, the process returns to step S21 after the lapse of the time of the detection period as in no of step S24.
If the detected temperature TA is equal to or higher than the threshold Tp1 as in yes at step S24, the temperature information processing unit 25a predicts that boiling-over will occur, and outputs boiling-over prediction information to the coil control unit 10. The coil control unit 10 decreases the heating power of the corresponding heating coil based on the prediction information (S25). Further, a plurality of thresholds may be prepared, and the heating power may be adjusted in stages.
As described above, the heating cooker 1 of the embodiment has the main body 3 and the temperature detection module 19. The main body 3 has: a top plate 5 on which a container Cr containing an object to be heated Tc as a cooking object is placed; heating coils 7A to 7C that heat the container Cr; and a coil control unit 10 that controls heating outputs of the heating coils 7A to 7C.
The temperature detection module 19 includes a temperature detection unit 29, and the temperature detection unit 29 detects a temperature distribution on the top panel 5 from above the top panel 5. The coil control unit 10 controls the heating output based on the temperature information detected by the temperature detection unit 29. The temperature detection unit 29 includes a plurality of temperature detection pixels 29aa to 29 hh. The temperature detection module 19 includes a temperature distribution correction unit 31b, and the temperature distribution correction unit 31b corrects the temperature distribution detected by the temperature detection unit 29 based on the temperatures of the plurality of specific regions 57 on the top plate 5.
With this configuration, even if the temperature detection module 19 is attached to the top plate 5 in an inclined manner, the detected temperature distribution can be appropriately corrected. Therefore, the degree of freedom of the installation position of the temperature detection module 19 can be improved.
When the temperature detection module 19 is provided directly above the heating cooker 1, there is a problem that an error occurs in the detected temperature due to adhesion of dirt or the like to the temperature detection unit 29. Further, it is also necessary to take a trouble to remove dirt and the like adhering to the temperature detection unit 29.
In contrast, according to the heating cooker 1 of the embodiment, the temperature detection module 19 can be attached to the heating cooker 1 in an inclined manner, so that the amount of dirt adhering to the temperature detection unit 29 can be reduced. This can reduce the frequency of removing dirt in the temperature detection unit 29, and can reduce the burden on the user.
The temperature distribution correcting unit 31b corrects the temperature distribution based on the difference in the temperature information detected by the plurality of detection pixels 29aa to 29hh for the specific region 57 that is the plurality of specific portions at the same temperature. The mounting state of the temperature detection module 19 can be determined based on the difference in temperature information detected by the plurality of detection pixels 29aa to 29 hh. This makes it possible to correct the temperature distribution according to the mounting state of the temperature detection module 19, and to obtain an appropriate temperature distribution.
The temperature distribution correcting unit 31b detects distortion in the detection regions of the plurality of detection pixels 29aa to 29hh based on the difference in the temperature information detected by the plurality of detection pixels 29aa to 29hh, and corrects the temperature distribution based on the detected distortion. The distortion of the detection region of the plurality of detection pixels 29aa to 29hh corresponds to the mounting angle of the temperature detection unit 29. Therefore, the temperature distribution can be corrected in accordance with the distance to the detection region of the plurality of detection pixels 29aa to 29hh based on the detected distortion.
The temperature distribution correcting unit 31b calculates a temperature correction coefficient for each temperature detection pixel based on distortion in the detection region of the detection pixel, and has a storage unit 33 in which the temperature correction coefficient is stored in the storage unit 33, and the temperature distribution correcting unit 31b corrects the temperature distribution using the temperature correction coefficient stored in the storage unit 33. In this way, the temperature correction coefficient may be calculated when the temperature detection module 19 is installed on the wall 18.
Note that, instead of using the temperature adjustment unit 55 to set the temperature of the specific region 57 to a temperature higher than the ambient temperature, the following configuration may be employed. As shown in fig. 13, for example, the user's fingers are placed on the left end portion of the operation input portion 9A and the right end portion of the operation input portion 9B on the top panel 5, and the temperature information is acquired by the temperature detection portion 29. The finger is a part of the human body and therefore has a temperature of around 35 ℃. When the ambient temperature is, for example, 30 ℃, since there is a temperature difference of 5 ℃, the region of the finger can be detected by the temperature detection unit 29. In this way, the temperature detection unit 29 can detect the temperature of the operation region in which the user operates the operation input units 9A and 9B, as in the specific region 57. Therefore, as the specific portion, instead of the specific region 57, a work region in which the user operates the operation input portions 9A and 9B as the operation portions can be set as the specific portion. When the detected temperatures are different, the temperature detection module 19 is installed on a wall or the like.
Specifically, when the temperature at the time of detecting the left end portion of operation input unit 9A is higher than the temperature detected at the right end portion of operation input unit 9B, temperature detection module 19 is highly likely to be provided on the left wall of heating cooker 1. This is because the detection temperature when the right end portion of the operation input portion 9B is pressed is low, and therefore, the distance is long and the finger as the measurement target is smaller than the visual field range of the temperature detection module 19, and therefore, the temperature is averaged to the temperature of the top panel 5 other than the finger.
Therefore, for example, in order to prevent boiling over, when the temperature detected by the temperature detection block 19 exceeds a certain threshold, control is performed such that the heating power is reduced, and when the correction is not accurately performed at this time, the detection pixels on the side away from the temperature detection block 19 are averaged due to pixel distortion. Moreover, the detection temperature tends to be too low. Therefore, the temperature does not exceed the threshold until the temperature becomes higher than the temperature to be originally detected, and therefore there is a possibility that the detection and the control may be delayed. Therefore, unless it is determined at which position the temperature detection module 19 is set and accurately corrected, or the detection threshold value is changed from pixel to pixel, detection cannot be performed at the same temperature.
Fig. 14 is an explanatory diagram showing an example of the thermal image 51 obtained when the temperature detection module 19 is disposed at a position facing the top plate 5 and at a long distance. The temperature of the finger is detected by 2 pixel regions 51a of the thermal image 51, and these pixel regions 51a correspond to the regions of the finger. There is a region of 2 pixels between the 2-pixel regions 51a of the thermal image 51.
The physical distance La between the left end of the operation input unit 9A on which the finger is placed and the right end of the operation input unit 9B is measured in advance and stored in the storage unit 33. Since the distance La (see fig. 3) on the top 5 corresponds to the length of 2 pixels on the thermal image 51, the distance calculating unit 31bc of the temperature distribution correcting unit 31b can detect the field of view of the temperature sensor 29a and the height from the top 5.
Fig. 15 is an explanatory diagram showing an example of a thermal image 53 obtained when the temperature detection module 19 is disposed at a short distance from the top plate 5. The temperature of the finger is detected by 2 pixel regions 53a of the thermal image 53, and these pixel regions 53a correspond to the regions of the finger. There is a region of 6 pixels between the 2 pixel regions 53a of the thermal image 53. Since the distance La on the top 5 corresponds to the length of 6 pixels on the thermal image 53, the distance calculating unit 31bc of the temperature distribution correcting unit 31b can calculate the visual field range of the temperature sensor 29a and the height from the top 5.
In this way, the distance calculation unit 31bc of the temperature distribution correction unit 31b calculates the field of view of the temperature detection module 19, and therefore can detect the installation height of the temperature detection module 19. The temperature correcting unit 31bd corrects the temperature detected by the temperature detecting unit 29, based on the distance to the top plate 5 calculated by the distance calculating unit 31 bc. This reduces the burden on the user in measurement, and realizes heating control with higher accuracy.
The temperature detection unit 29 of the temperature detection module 19 may increase the gain of temperature detection when calculating the temperature correction coefficient. Specifically, when the temperature information for calculating the temperature correction coefficient is acquired, the amplification of the amplifier 29b is increased. Thus, even when the difference between the ambient temperature and the temperature of the plurality of specific portions on the top plate 5 is small, the plurality of specific portions can be detected with high accuracy.
Instead of arranging the temperature adjustment unit 55 in the main body 3 and changing the temperature of the specific region 57, an object having a temperature different from the ambient temperature may be placed on the top plate 5 to correct the temperature distribution detected by the temperature detection unit 29.
In the example shown in fig. 16, a plurality of regions 59 are provided on the top plate 5 at intervals, and an object having a temperature different from the ambient temperature is placed on the plurality of regions 59. The user places an object having a temperature different from the ambient temperature on the area 59, and the temperature detector 29 can thereby detect the area 59. Therefore, the temperature distribution correcting unit 31b can correct the temperature distribution detected by the temperature detecting unit 29 based on the temperature of the object placed on the area 59. In fig. 16, 2 regions 59 are provided in the top plate 5, but 3 or more regions may be provided.
Instead of placing an object having a temperature different from the ambient temperature on the top plate 5, the container Cr may be heated by the plurality of heating coils 7A to 7C to correct the temperature distribution. By heating a plurality of arbitrary 2 or more containers Cr placed on the heating coils 7A to 7C, 2 containers Cr having a temperature different from the ambient temperature are present on the top plate 5. Therefore, the temperature detector 29 can detect the position of the heated container Cr. The temperature distribution correcting unit 31b can correct the temperature distribution of the temperature detecting unit 29 based on the temperature of the container Cr.
In this way, even if a plurality of heating coils 7A to 7C serving as heating portions are provided and the container Cr on the top plate 5 heated by the plurality of heating coils 7A to 7C is set as a specific portion, the temperature distribution can be corrected.
In the configuration of patent document 1, when an obstacle exists on the optical path of infrared rays, the infrared rays cannot be received by the communication unit, and therefore, there is a problem that the position cannot be calculated. In the present embodiment, since the communication unit that receives infrared rays emitted from the infrared light emitting element is not provided, such a problem is not caused.
The present disclosure is not limited to the above-described embodiments, and modifications can be implemented as follows.
In the above embodiment, the heating cooker 1 is an induction heating cooker that inductively heats the container Cr using the heating coils 7A to 7C, but is not limited thereto. For example, the heating cooker 1 may be a gas range. In the case of a gas range, the container Cr is placed on a triangular flame holder as a container placing portion provided on the top plate 5 of the main body 3, and is heated from below the triangular flame holder by a gas burner as a heating portion. In the case of a gas range, a gas amount control unit is provided in place of the coil control unit. A gas amount control unit, which is an example of the heating control unit, controls the amount of gas supplied to the gas burner.
In addition, by appropriately combining any of the various embodiments and the modifications described above, the effects of the respective embodiments can be obtained by being superimposed.
The present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, but various variations and modifications will be apparent to those skilled in the art. Such variations and modifications are to be understood as being included within the present disclosure, unless they depart from the scope thereof as defined by the appended claims. Further, combinations of elements and changes in the order of the elements in the embodiments can be implemented without departing from the scope and spirit of the present disclosure.
Industrial applicability
As described above, according to the present disclosure, a special effect is obtained as a heating cooker capable of improving the degree of freedom of the installation position of the temperature detection module can be provided. Therefore, the present disclosure is useful for a heating cooker, particularly a heating cooker having a function of detecting the temperature of an object to be heated.
Description of the reference symbols
1: a heating cooker; 3: a main body; 4: a notification unit; 5: a top plate; 6A, 6B, 6C: a light emitting section; 7A, 7B, 7C: a heating coil; 8A, 8B, 8C: marking; 9A, 9B, 9C: an operation input unit; 10: a coil control unit; 11: a display unit; 13: a setting unit; 13 a: a setting key; 13 b: a setting display unit; 15: a sound output unit; 17: a range hood; 17 a: a cover portion; 18: a wall; 19: a temperature detection module; 21: a 1 st communication unit; 23: a 2 nd communication unit; 25: a control unit; 25 a: a temperature information processing unit; 27: a storage unit; 29: a temperature detection unit; 29 a: a temperature sensor; 29aa to 29 hh: detecting a pixel; 29 b: an amplifying part; 31: a control unit; 31 a: an installation determination unit; 31 b: a temperature distribution correction unit; 31 ba: a distortion detection unit; 31 bb: an installation angle calculation unit; 31 bc: a distance calculation unit; 31 bd: a temperature correction unit; 33: a storage unit; 35: a power storage unit; 51: a thermal image; 51 a: a pixel region; 53: a thermal image; 53 a: a pixel region; 55: a temperature adjustment unit; 57: a specific region; 59: an area; cr: a container; la: a distance; tc: an object to be heated; tp 1: a threshold value; TA: detecting the temperature; TW, TL, TH: a temperature profile; mb: the object is measured.
Claims (13)
1. A heating cooker, comprising: a main body having a top plate on which a container for containing a cooking material is placed, a heating unit for heating the container, and a heating control unit for controlling a heating output of the heating unit; and a temperature detection module having a temperature detection unit for detecting a temperature distribution on the top plate from above the top plate, wherein in the heating cooker,
the heating control unit controls the heating output based on the temperature distribution detected by the temperature detection unit,
the temperature detection unit has a plurality of temperature detection elements for respectively detecting temperature information,
the heating cooker further includes a temperature distribution correcting unit that corrects the temperature distribution detected by the temperature detecting unit, based on the temperature information of a plurality of specific portions on the top plate.
2. The heating cooker according to claim 1,
the plurality of temperature detection elements are arranged in an array form arranged in a longitudinal direction and a transverse direction in a plan view.
3. The heating cooker according to claim 1 or 2,
the temperature distribution correcting unit corrects the temperature distribution for the plurality of specific portions having the same temperature based on a difference in the temperature information of the plurality of specific portions detected by the plurality of temperature detecting elements.
4. The heating cooker according to claim 3,
the temperature distribution correction unit detects distortion in the detection region of each of the plurality of temperature detection elements based on a difference in the temperature information detected by the plurality of temperature detection elements, and corrects the temperature distribution based on the detected distortion.
5. The heating cooker according to any one of claims 1 to 4,
the heating cooker further includes a temperature adjustment unit that heats or cools the plurality of specific portions of the top plate,
the temperature distribution correcting unit corrects the temperature distribution based on the temperature information of the plurality of specific portions of the top plate after being heated or cooled.
6. The heating cooker according to any one of claims 1 to 4,
the heating coil heats the specific portions of the top plate,
the temperature distribution correcting unit corrects the temperature distribution based on the temperature information of the plurality of specific portions of the heated top plate.
7. The heating cooker according to claim 5 or 6,
the plurality of specific portions to be heated or cooled are arranged in a region different from a region of the heating portion in a plan view.
8. The heating cooker according to any one of claims 1 to 4,
the plurality of specific portions are a plurality of objects placed on the top plate and having a temperature different from an ambient temperature,
the temperature distribution correcting unit corrects the temperature distribution detected by the temperature detecting unit, based on the temperatures of the plurality of objects.
9. The heating cooker according to any one of claims 1 to 4,
the heating cooker has a plurality of the heating portions,
the plurality of specific portions are the containers on the top plate heated by the plurality of heating portions.
10. The heating cooker according to any one of claims 1 to 4,
the heating cooker further comprises an operation part connected with the heating control part for setting the heating amount,
the plurality of specific portions are a plurality of work areas used by a user to operate the operation portion.
11. The heating cooker according to claim 4,
the temperature distribution correction section calculates a temperature correction coefficient for each of the temperature detection elements based on the distortion,
the heating cooker has a storage unit in which the temperature correction coefficient is stored,
the temperature distribution correction unit corrects the temperature distribution using the temperature correction coefficient stored in the storage unit.
12. The heating cooker as claimed in claim 11,
the temperature detection unit increases a gain of temperature detection when calculating the temperature correction coefficient.
13. The heating cooker according to any one of claims 1 to 12,
the heating part has a heating coil that generates an induction magnetic field to heat the container,
the heating control unit supplies a high-frequency current to the heating coil to heat the container.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018123614A JP2020004621A (en) | 2018-06-28 | 2018-06-28 | Heating cooker |
| JP2018-123614 | 2018-06-28 | ||
| PCT/JP2019/024578 WO2020004233A1 (en) | 2018-06-28 | 2019-06-20 | Heating cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111052860A true CN111052860A (en) | 2020-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980003783.XA Pending CN111052860A (en) | 2018-06-28 | 2019-06-20 | Heating cooker |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2020004621A (en) |
| CN (1) | CN111052860A (en) |
| WO (1) | WO2020004233A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0960885A (en) * | 1995-08-29 | 1997-03-04 | Sanyo Electric Co Ltd | Micro-wave oven |
| JP2003176917A (en) * | 2002-12-25 | 2003-06-27 | Matsushita Electric Ind Co Ltd | Cooker |
| CN102798161A (en) * | 2011-05-25 | 2012-11-28 | 松下电器产业株式会社 | Heating cooker |
| JP2015106462A (en) * | 2013-11-29 | 2015-06-08 | 日立アプライアンス株式会社 | Heating cooker |
| CN107543617A (en) * | 2016-06-23 | 2018-01-05 | 松下知识产权经营株式会社 | Infra-red ray detection device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012220096A (en) * | 2011-04-08 | 2012-11-12 | Panasonic Corp | Range hood fan |
| JP2017194449A (en) * | 2016-04-15 | 2017-10-26 | パナソニックＩｐマネジメント株式会社 | Cooking support method and cooking support system |
-
2018
- 2018-06-28 JP JP2018123614A patent/JP2020004621A/en active Pending
-
2019
- 2019-06-20 CN CN201980003783.XA patent/CN111052860A/en active Pending
- 2019-06-20 WO PCT/JP2019/024578 patent/WO2020004233A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0960885A (en) * | 1995-08-29 | 1997-03-04 | Sanyo Electric Co Ltd | Micro-wave oven |
| JP2003176917A (en) * | 2002-12-25 | 2003-06-27 | Matsushita Electric Ind Co Ltd | Cooker |
| CN102798161A (en) * | 2011-05-25 | 2012-11-28 | 松下电器产业株式会社 | Heating cooker |
| JP2015106462A (en) * | 2013-11-29 | 2015-06-08 | 日立アプライアンス株式会社 | Heating cooker |
| CN107543617A (en) * | 2016-06-23 | 2018-01-05 | 松下知识产权经营株式会社 | Infra-red ray detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020004621A (en) | 2020-01-09 |
| WO2020004233A1 (en) | 2020-01-02 |
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