JPWO2018078869A1 - Burn detection system, cookware, and burn detection method - Google Patents

Abstract

  The heating cooker (3) heats the cooked food (4) by the heating coil (33) and the top plate (31). The impedance measuring device (20) included in the cooking utensil (2) measures the electrical impedance of the cooked food (4). A temperature sensor (36) provided in the heating cooker (3) measures the temperature of the cooked food (4). The control unit (37) included in the heating cooker (3) is based on the electrical impedance measured by the impedance measuring device (20) and the threshold value determined according to the temperature measured by the temperature sensor (36). (4) Detecting the burning. When it is detected that the camera is in focus, the control unit (37) notifies the user to that effect.

Description

  The present invention relates to a burn detection system, a cooking utensil, and a burn detection method.

  2. Description of the Related Art In recent years, cooking appliances that heat cooking items contained in cooking utensils such as pots by induction heating have become widespread. Some types of cooking appliances have a cooking support function that automatically performs control to suppress heating or informs the user through an operation interface in accordance with a user's operation or cooking state.

  As one of such cooking support functions, detection of in-focus is known (for example, Patent Document 1).

Japanese Patent No. 5838314

  As disclosed in Patent Document 1, generally, in the conventional detection of burning, the temperature of the bottom of the cooking utensil is measured, and when the measured temperature exceeds a predetermined threshold, the cooking object in the cooking utensil is burned. Adopting a method of detecting

  The conventional detection of burning that relies on a change in temperature can be expected to have good detection accuracy when a food with a lot of sultry such as boiled food is to be detected.

  However, when baking and cooking solid foods such as meat and processed meat that are poorly succulent, the temperature of the cooking utensil tends to increase even before scorching occurs, and the temperature change is also small, It is difficult to detect the focus with high accuracy by the conventional method.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a scoring detection system that can accurately detect scoring even in a solid food with low sap. .

In order to achieve the above object, a focus detection system according to the present invention includes:
Heating means for heating the cooked food,
Impedance measuring means for measuring the impedance of the food,
Temperature measuring means for measuring the temperature of the food,
Detecting means for detecting the burning of the food based on the measured impedance and a threshold value determined according to the measured temperature;
An informing means for informing the user that the incineration has been detected.

  In this invention, the burning of a foodstuff is detected based on the impedance of a foodstuff, and the threshold value defined according to the temperature of a foodstuff. For this reason, even if it is a solid food with low sap, it becomes possible to detect scoring accurately.

The figure which shows the structure of the focus detection system which concerns on Embodiment 1 of this invention. The figure for demonstrating arrangement | positioning of an electrode Block diagram showing the configuration of the impedance measuring device Block diagram showing the configuration of the measurement circuit The figure which shows the example of the mark formed in a cooking utensil The figure for demonstrating the modification of the shape of an electrode Schematic showing the appearance of the cooking device The figure which shows an example of the operation reception part with which a heating cooker is provided The block diagram which shows the hardware constitutions of the control part with which a heating cooker is provided The figure which shows the function structure of the control part with which a heating cooker is provided. Graph showing the relationship between cooking time and electrical impedance Flowchart showing the procedure of in-focus detection processing The figure for demonstrating arrangement | positioning of several electrode pairs The figure for demonstrating arrangement | positioning of several electrode pairs The block diagram which shows the structure of the impedance measuring device in the modification of Embodiment 1. The block diagram which shows the structure of the impedance measuring device in the modification of Embodiment 1. The figure which shows the structure of the focus detection system in the modification of Embodiment 1. The figure which shows the structure of the cooking appliance which concerns on Embodiment 2 of this invention. FIG. 3 is a block diagram illustrating a configuration of a focus detection apparatus according to a second embodiment. The figure for demonstrating the focus detection system which concerns on other embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a focus detection system 1 according to Embodiment 1 of the present invention. The scoring detection system 1 is a system that detects scoring of the food 4 during cooking, and includes a cooking utensil 2 and a heating cooker 3.

  The cooking utensil 2 is a cooking utensil for baking the food 4 (for example, hamburger), and is a frying pan in this embodiment. As shown in FIGS. 1 and 2, the cooking utensil 2 is provided with an impedance measuring device 20, and further, as shown in FIG. 2, a pair of electrodes 21a and 21b are provided. The impedance measuring device 20 (impedance measuring means) is a device that measures the electrical impedance of the food 4 placed on the bottom of the cooking utensil 2 and is embedded in the handle of the cooking utensil 2.

  The electrodes 21a and 21b are plate-shaped and are made of a highly conductive metal. Electrode 21a, 21b is provided in the center of the pan bottom surface (cooking surface) in the aspect which mutually opposes. The electrodes 21a and 21b are connected to the impedance measuring device 20 via signal lines, respectively. Each signal line connects between the electrodes 21a and 21b and the impedance measuring device 20 through the inside of the pan bottom and the inside of the handle.

  As shown in FIG. 3, the impedance measurement device 20 includes a measurement circuit 200, a communication unit 201, and a control unit 202. The impedance measuring device 20 further includes a power supply unit (not shown) such as a primary battery or a secondary battery. The impedance measuring device 20 may be supplied with electric power from the heating cooker 3 by non-contact power transmission using electromagnetic induction.

  As shown in FIG. 4, the measurement circuit 200 includes an oscillator 210, a voltage sensor 211, and a current sensor 212. The oscillator 210 generates a voltage signal having a predetermined frequency (for example, 100 Hz, 1 kHz, 100 kHz, etc.). The voltage sensor 211 measures a potential difference between the electrodes 21a and 21b, and the current sensor 212 measures an alternating current flowing between the electrodes 21a and 21b. A signal indicating the measurement result of the voltage sensor 211 and a signal indicating the measurement result of the current sensor 212 are output to the control unit 202.

  Although not shown, the control unit 202 has two input ports for inputting signals output from the voltage sensor 211 and the current sensor 212 of the measurement circuit 200, a CPU (Central Processing Unit), and a ROM (Read Only). Memory) and RAM (Random Access Memory). The control unit 202 determines the electrical impedance between the electrodes 21a and 21b based on the measurement result of the voltage sensor 211 and the measurement result of the current sensor 212, in other words, the electricity of the food 4 placed on the electrodes 21a and 21b. Measure impedance (synthetic impedance). As a method for measuring the electrical impedance, for example, a known method such as a bridge method, a resonance method, or an IV method can be employed.

  The communication unit 201 (transmission means) is a communication interface for wirelessly communicating with the heating cooker 3. The communication unit 201 wirelessly communicates with the heating cooker 3 by a short-range wireless method such as RFID (Radio Frequency Identification) or NFC (Near Field Communication). Note that wireless communication between the impedance measuring device 20 and the heating cooker 3 may be performed by Wi-Fi (registered trademark) or Bluetooth (registered trademark).

  The control unit 202 transmits data (measurement data) indicating the measured electrical impedance to the heating cooker 3 via the communication unit 201 at intervals of several seconds (for example, 5 seconds).

  In addition, as shown in FIG. 5, you may surface-treat (surface processing) to the center part of the pan bottom of the cooking appliance 2, and you may form the mark 22 which a user can visually recognize. In this way, the user can easily place the food 4 on the electrodes 21a and 21b.

  Further, the electrodes 21a and 21b may have a bow shape as shown in FIG. 6 instead of a plate shape (linear shape). If it does in this way, since the electrical impedance can be measured in the site | part where the distance from the center where the amount of heat is easy to be transmitted, that is, the thermal power is easily transmitted, is uniform in the cooked food 4, the accuracy of the detection of the burning can be improved.

  Returning to FIG. 1, the heating cooker 3 is an induction heating (IH) cooker, and includes a top plate 31 and an operation receiving unit 32 provided on the upper surface side of a substantially rectangular parallelepiped casing 30, and an interior of the casing 30. The accommodated heating coil 33, inverter circuit 34, communication unit 35, temperature sensor 36, and control unit 37 are provided.

  The top plate 31 is made of tempered glass. The heating coil 33 is provided below the top plate 31 and generates an induction magnetic field when a high-frequency current supplied from the inverter circuit 34 flows under the control of a control unit 37 described later. Such an induction magnetic field acts on the cooking utensil 2 placed on the top plate 31, and the cooking utensil 2 is heated (so-called induction heating). Thereby, the top plate 31 indirectly heats the food 4 contained in the cooking utensil 2. The top plate 31 and the heating coil 33 constitute the heating means of the present invention.

  The heating coil 33 is connected to the inverter circuit 34 through a signal line. The inverter circuit 34 supplies a high frequency current to the heating coil 33 under the control of the control unit 37. In the present embodiment, the number of top plates 31 is one, but when there are a plurality of top plates 31, a heating coil 33 and an inverter circuit 34 are provided corresponding to each top plate 31.

  As shown in FIG. 7, the operation reception unit 32 is provided on the upper surface of the front side (that is, the user side) of the housing 30 and includes a power button 320 and a touch panel 321. The power button 320 is a button for accepting the power on / off of the cooking device 3 from the user. The touch panel 321 includes, for example, a liquid crystal display device and a capacitive touch sensor. The touch panel 321 displays an operation screen for accepting an operation related to cooking from the user under the control of the control unit 37, accepts an operation by the user, and connects a signal related to the accepted operation via a signal line. To the unit 37.

  The operation screen displayed on the touch panel 321 includes a cooking menu screen and a heating power setting screen as shown in FIG. The user can select a desired cooking menu via the cooking menu screen, and can set the heating power (heating intensity) to a desired strength via the heating power setting screen. The example of FIG. 8 shows a state in which “baked goods” is selected as the cooking menu and the strength of the heating power is set to “medium”.

  Returning to FIG. 1, the communication unit 35 (reception unit) is a communication interface for wirelessly communicating with the impedance measuring apparatus 20 by a short-range wireless method such as RFID or NFC.

  The temperature sensor 36 (temperature measuring means) is installed at the center of the back surface of the top plate 31, indirectly measures the temperature of the pan bottom of the cooking utensil 2, and sends a signal indicating the measurement result to the control unit 37 via a signal line. Output to. The temperature sensor 36 includes, for example, a thermal element such as a thermistor, or an infrared sensor that detects the amount of infrared energy emitted from the pan bottom of the cooking utensil 2 and outputs a voltage corresponding to the detected amount of energy. The

  As illustrated in FIG. 9, the control unit 37 includes a CPU 370, a ROM 371, a RAM 372, a secondary storage device 373, and a plurality of ports 374. These components are connected to each other via a bus 375.

  The CPU 370 comprehensively controls the heating cooker 3. The ROM 371 stores a plurality of firmware, data used when executing these firmware, and the like. The RAM 372 is used as a work area for the CPU 370. The secondary storage device 373 is composed of an EEPROM (Electrically Erasable Programmable Read-Only Memory), a readable / writable nonvolatile semiconductor memory such as a flash memory, and the like, and stores a program and data relating to the detection of in-focus. In addition to this, the secondary storage device 373 stores a program and data for performing a function as a general IH cooker.

  The port 374 is an interface for inputting and outputting signals exchanged with the operation receiving unit 32, the inverter circuit 34, the communication unit 35, and the temperature sensor 36.

  Functionally, the control unit 37 includes an impedance acquisition unit 3700, a temperature acquisition unit 3701, a focus detection unit 3702, a heating reduction unit 3703, and a notification unit 3704 as shown in FIG. These functional units are realized by the CPU 370 executing a program relating to in-focus detection stored in the secondary storage device 373.

  The impedance acquisition unit 3700 acquires the electrical impedance of the food 4. Specifically, the impedance acquisition unit 3700 acquires measurement data transmitted from the impedance measurement device 20 via the communication unit 35, and stores the acquired measurement data in the RAM 372.

  The temperature acquisition unit 3701 acquires the surface temperature of the food 4. In the present embodiment, the temperature based on the measurement result of the temperature sensor 36 is regarded as the surface temperature of the food 4. Specifically, the temperature acquisition unit 3701 reads a signal from the port 374 corresponding to the temperature sensor 36, that is, a signal indicating the measurement result output from the temperature sensor 36 at a constant time interval (for example, every 5 seconds), The read signal is converted into data (temperature data) indicating temperature (° C.). The temperature acquisition unit 3701 stores the temperature data acquired in this way (that is, the surface temperature of the food 4) in the RAM 372.

  The focus detection unit 3702 (detection means) compares the electrical impedance of the cooked food 4 with a threshold value (hereinafter referred to as “the threshold value”) determined according to the surface temperature of the cooked food 4. Detect burning.

  Here, the relationship between electrical impedance and the occurrence of scoring will be described. FIG. 11 is a graph showing the relationship between hamburger cooking time and electrical impedance obtained by experiment. In this experiment, a plurality of raw hamburgers having the same conditions (components, sizes, masses, etc.) before cooking (heating) were prepared, and the electrical impedance was measured after cooking for different times (1 to 5 minutes). In addition, the measurement of electrical impedance was performed after the hamburger after each cooking was sufficiently cooled to about room temperature.

  From this experiment, the inventors found that the longer the cooking time (heating time), that is, the state change of the cooked product (hamburger) progressed, and the greater the burning, the higher the electrical impedance of the cooked product. I found. On the other hand, it is known that the electrical impedance tends to decrease as the temperature increases. The inventors have created a new method for detecting the burning of the cooked food based on these findings.

  Specifically, first, the focus detection unit 3702 calculates a correction value by multiplying the surface temperature (° C.) of the food 4 acquired by the temperature acquisition unit 3701 by a predetermined coefficient (temperature coefficient). . The temperature coefficient is derived, for example, from data indicating the relationship between temperature and electrical impedance obtained by experiment.

  Next, the focus detection unit 3702 calculates the threshold value by subtracting the correction value from a predetermined reference threshold value. The reference threshold is, for example, 50 kΩ. Then, the focus detection unit 3702 determines whether or not the acquired electrical impedance of the food 4 exceeds the calculated threshold value. As a result, when the electrical impedance of the cooked food 4 exceeds the threshold value, the burn detection unit 3702 detects the burn, that is, determines that the cook 4 is burned.

  The heating reduction unit 3703 (heating reduction unit) instructs the inverter circuit 34 to stop heating or reduce thermal power (heating intensity) when the burning detection unit 3702 detects burning.

  The notification unit 3704 (notification unit) notifies the user of the occurrence of the focus when the focus detection unit 3702 detects the focus. Specifically, the notification unit 3704 causes a sound output unit (not shown) included in the operation reception unit 32 to output a warning sound (for example, an electronic sound such as a buzzer sound) or a voice message. In the case of a voice message, for example, it is notified that a burn has occurred, or that it has been automatically stopped or has reduced its thermal power.

  In addition, in addition to the output of the warning sound and the voice message, the notification unit 3704 indicates that the touch panel 321 of the operation reception unit 32 has been burned, has automatically stopped, or has reduced the thermal power. You may display with a character and an image, you may display LED which the operation reception part 32 is not shown in a predetermined color (for example, red), or blink.

  In addition, the notification unit 3704 communicates with a mobile terminal (smart phone, tablet terminal, etc.) possessed by the user via the communication unit 35 instead of or in combination with the above notification, and the mobile terminal is not in focus. It may be displayed as characters or images that it has occurred, or it has been automatically stopped or reduced in thermal power, or a warning sound or voice message may be output. Alternatively, the notification unit 3704 may communicate with a HEMS (Home Energy Management System) controller via the communication unit 35 to cause the HEMS user interface (an operation terminal such as a tablet terminal) to perform notification as described above. In this case, the cooking device 3 and the controller of the HMES are communicatively connected via, for example, a network conforming to ECHONET Lite.

  FIG. 12 is a flowchart showing the procedure of the burn-in detection process executed by the control unit 37 of the heating cooker 3. The focus detection process is started when an operation related to the start of cooking is performed by the user via the touch panel 321.

  When the impedance acquisition unit 3700 acquires the electrical impedance of the food 4, that is, the measurement data transmitted from the impedance measurement device 20 of the cooking utensil 2 via the communication unit 35 (step S <b> 101; YES), the acquired measurement data is obtained. Save in the RAM 372. The impedance measuring device 20 of the cooking utensil 2 is activated when a switch (such as a power switch) (not shown) provided in the cooking utensil 2 for starting measurement is turned on by the user, The operation of measuring electrical impedance and transmitting measurement data is repeated.

  When the heating cooker 3 is not in a heating operation (step S102; NO), the control unit 37 ends the scoring detection process. On the other hand, when the heating operation is being performed (step S102; YES), the temperature acquisition unit 3701 acquires the surface temperature of the food 4 as described above (step S103). The focus detection unit 3702 calculates a correction value based on the surface temperature of the cooked food 4 acquired by the temperature acquisition unit 3701 (step S104). The correction value is calculated by multiplying the surface temperature (° C.) of the food 4 by the temperature coefficient described above.

  Next, the focus detection unit 3702 calculates the main threshold based on the reference threshold and the calculated correction value (step S105). This threshold value is calculated by subtracting the correction value from the reference threshold value (for example, 50 kΩ).

  The focus detection unit 3702 determines whether or not the electrical impedance of the food 4 exceeds the calculated threshold value (step S106). When the electrical impedance of the food 4 does not exceed the threshold (step S106; NO), the process returns to step S101, and the impedance acquisition unit 3700 until the next measurement data is transmitted from the impedance measuring device 20 of the cooking utensil 2. stand by. When the impedance measuring device 20 continuously measures the electrical impedance, the standby time of the impedance acquisition unit 3700 is, for example, 5 seconds.

  On the other hand, when the electrical impedance of the food 4 exceeds this threshold (step S106; YES), the heating reduction unit 3703 instructs the inverter circuit 34 to stop heating, or heat (heating intensity). Is reduced (step S107). In addition, the notification unit 3704 notifies the user of the occurrence of burning (step S108). For example, the notification unit 3704 causes a sound output unit (not shown) included in the operation reception unit 32 to output a warning sound or a voice message, or causes the touch panel 321 to display information related to the occurrence of burning.

  As described above, in the scoring detection system 1 according to the first embodiment of the present invention, the heating cooker 3 includes the electrical impedance of the cooked food 4 measured by the impedance measuring device 20 of the cooking utensil 2 and the temperature sensor 36. The cooking object 4 is detected on the basis of the surface temperature of the cooking object 4 measured by the above. For this reason, even if the food 4 is a solid food such as beef, pork, chicken or hamburger with a low sap, it can accurately detect scoring.

  The first embodiment may be modified as follows.

(Modification 1)
For example, as shown in FIGS. 13 and 14, a plurality of electrode pairs (21-1a and 21-1b, 21-2a and 21-2b, 21-3a and 21-3b) have different distances between the electrodes. The cooking utensil 2 may be provided. In this case, as shown in FIG. 15, the impedance measuring device 20 includes measuring circuits 200-1 to 200-3 corresponding to each electrode pair. Alternatively, as illustrated in FIG. 16, an electrode switching unit 203 may be provided, and electrode pairs connected to the measurement circuit 200 may be sequentially switched according to a command from the control unit 202. The electrode switching unit 203 is configured by a mechanical relay or a semiconductor relay.

  The control unit 202 of the impedance measuring device 20 may transmit the measurement data storing all the measurement results of each electrode pair to the heating cooker 3 or sequentially transmit the measurement data for each electrode pair to the heating cooker 3. May be.

  If it does in this way, the control part 37 of the cooking-by-heating machine 3 will focus on the several electrical impedance according to the distance between electrodes, ie, the several electrical impedance according to the magnitude | size of the measurement range in the cooking thing 4. Detection can be performed. Thereby, the size of the burn and the internal state of the cooked food 4 can also be discriminated. For example, it is possible to prevent inconveniences such as stopping a heating by detecting some small burn such as raw burn.

  In addition, since a plurality of cooked foods 4 may be cooked at the same time, a plurality of electrode pairs may be arranged in various locations on the pan bottom surface of the cooking utensil 2.

(Modification 2)
As shown in FIG. 17, the detection system 1 may further include an odor sensor 5 (odor measuring means) and a camera 6 (imaging means). The odor sensor 5 (odor measuring means) and the camera 6 (imaging means) are installed in the range hood and are connected to the heating cooker 3 so as to be communicable via wire or wirelessly. The odor sensor 5 uses a light component (small molecular weight) component or sulfur component as a measurement target, and transmits a signal indicating the measurement result to the heating cooker 3. The camera 6 includes an image sensor such as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The camera 6 images the lower region at intervals of several seconds (for example, 5 seconds), and transmits data indicating the captured image to the heating cooker 3.

  And the control part 37 of the cooking-by-heating machine 3 performs the scoring detection of the food 4 in consideration of the measurement result of the odor sensor 5 and the image captured by the camera 6. In this way, the accuracy of detection of in-focus is further increased.

  In addition, when the ventilation fan is installed in the cabinet in which the heating cooker 3 is mounted, you may install the odor sensor 5 near the said ventilation fan. Moreover, the installation location of the camera 6 is also various, and the camera 6 may be installed at a location where the entire pan bottom of the cooking utensil 2 placed on the cooking device 3 can be imaged, such as a ceiling directly above the cooking device 3.

(Modification 3)
In addition, a temperature sensor (not shown) connected to the impedance measuring device 20 via a signal line is provided at the center of the pan bottom surface of the cooking utensil 2, and the impedance measuring device 20 displays the measurement result of the temperature sensor together with the measurement result of the electrical impedance. The included measurement data may be transmitted to the heating cooker 3. The temperature sensor in this case is composed of a thermosensitive element such as a thermistor, directly measures the temperature (surface temperature) of the food 4 and outputs a signal indicating the measurement result to the impedance measuring device 20 via the signal line. .

  If it does in this way, since the control part 37 of the cooking-by-heating machine 3 can calculate a correction value using the temperature approximated to the actual surface temperature of the food 4, it is possible to improve the accuracy of detection of burning.

(Modification 4)
Further, in the measurement circuit 200 of the impedance measurement device 20, the frequency of the voltage signal generated by the oscillator 210 may be changed according to a command from the control unit 202. The control unit 202 selects a preset frequency according to the type of the food 4. The type of the food 4 is specified by the user. In this case, for example, the cooking utensil 2 is provided with a designation receiving unit (not shown) such as a switch or a dial for allowing the user to designate the type of the cooked food 4 (beef, pork, chicken, hamburger, etc.). And the designation | designated reception part should just send the signal which shows the kind of designated cooking thing 4 to the control part 202. FIG. Alternatively, the impedance measuring device 20 can communicate information indicating the type of the designated cooking item 4 by communication so that the user can designate the type of the cooking item 4 via the operation receiving unit 32 of the cooking device 3. You may acquire from the heating cooker 3.

  If it does in this way, since an electrical impedance can be measured with the suitable frequency according to the kind of the cooking thing 4, the precision improvement of a burning detection can be aimed at.

(Modification 5)
Further, the control unit 37 of the heating cooker 3 may start the scoring detection process not only immediately after the start of cooking (start of heating) but when a predetermined start condition is satisfied. . The start condition includes, for example, when the temperature measured by the temperature sensor 36 rises to a predetermined temperature, when the integrated value of the power consumed by the inverter circuit 34 after the start of cooking reaches a predetermined power value, Is lowered to a predetermined lower limit value, a predetermined time has elapsed since the start of cooking, a case where the cooked food 4 is placed on the cooking utensil 2, a combination thereof, and the like. Whether the cooked food 4 is placed on the cooking utensil 2 may be determined based on the measurement result of the weight sensor provided with a weight sensor (not shown) in the heating cooker 3.

  By providing the above start condition, it is possible to prevent erroneous detection.

(Modification 6)
Moreover, you may perform the control part 37 of the heating cooker 3 only when the specific cooking menu (for example, pottery) is selected for the above-mentioned focus detection process. In this case, when another specific cooking menu (for example, stew) is selected, the focus detection based on the temperature change may be performed as in the past. Alternatively, the operation accepting unit 32 is provided with an on / off button (including a GUI (Graphical User Interface) button) for detection of burning, and the control unit 37 of the heating cooker 3 is limited to the case where the burning detection is on. The above-described focus detection process may be executed.

(Modification 7)
The control unit 37 of the heating cooker 3 may adjust the reference threshold according to the selected cooking menu, the type of the food 4, and the user's preference for baking conditions (rare, medium, welder, etc.). In this case, what is necessary is just to enable a user to specify the kind of cooking thing 4, and the preference of a baking condition via the operation reception part 32. FIG. In addition, like the modification 4 mentioned above, when the designation | designated reception part for a user to designate the kind of the food 4 is provided in the cooking appliance 2, the control part 37 is the kind of the food 4 May be acquired from the impedance measuring device 20 of the cooking utensil 2 by communication.

(Modification 8)
Alternatively, the electrodes 21 a and 21 b and the impedance measuring device 20 may be configured by a sheet-like IC so that the user can place the impedance measuring device 20 at an arbitrary position on the bottom of the cooking appliance 2.

(Embodiment 2)
Subsequently, Embodiment 2 of the present invention will be described. In the following description, components and the like that are common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The configuration of the cooking utensil 2A in the present embodiment is shown in FIG. The cooking utensil 2A is provided with a scoring detection device 23 instead of the impedance measurement device 20 of the first embodiment. Furthermore, the temperature sensor 24 is provided in the cooking utensil 2A.

  The temperature sensor 24 is provided at the center of the pan bottom surface of the cooking utensil 2A, directly measures the temperature (surface temperature) of the food 4 and sends a signal indicating the measurement result to the in-focus detection device 23 via a signal line. Output. The temperature sensor 24 (temperature measuring means) is composed of a thermal element such as a thermistor.

  As shown in FIG. 19, the focus detection device 23 includes a measurement circuit 230, a communication unit 231, and a control unit 232. The measurement circuit 230 has the same configuration (see FIG. 4) as the measurement circuit 200 of the first embodiment.

  The communication unit 231 (communication means) is a communication interface for wirelessly communicating with the heating cooker 3. The communication unit 231 communicates with the heating cooker 3 by a wireless method such as Wi-Fi (registered trademark) or Bluetooth (registered trademark).

  The control unit 232 (detection means, notification means) is not shown, but a plurality of input ports for inputting a signal output from the measurement circuit 230 or a signal output from the temperature sensor 24, a CPU, a ROM, And RAM. The functions relating to the following processing in the control unit 232 are realized by executing a program relating to the detection of in-focus stored in the ROM by the CPU. Note that the measurement circuit 230 and the control unit 232 constitute an impedance measurement unit.

  Similar to the control unit 202 of the first embodiment, the control unit 232 sets the electrical impedance between the electrodes 21a and 21b, in other words, the electrical impedance of the food 4 placed on the electrodes 21a and 21b on the order of several seconds (for example, 5 seconds). Further, the control unit 232 reads a signal from the input port corresponding to the temperature sensor 24, that is, a signal indicating the measurement result output from the temperature sensor 24 in synchronization with the measurement of the electrical impedance, and reads the read signal to the temperature. Converted to data (temperature data) indicating (° C).

  Then, the control unit 232 performs the focus detection by the same method as the focus detection unit 3702 of the first embodiment. That is, the control unit 232 calculates the correction value by multiplying the surface temperature (° C.) of the food 4 measured by the temperature sensor 24 by the same temperature coefficient as in the first embodiment. Next, the control unit 232 calculates this threshold value by subtracting the calculated correction value from a predetermined reference threshold value (for example, 50 kΩ).

  The control unit 232 determines whether or not the measured electrical impedance of the food 4 exceeds the calculated threshold value. As a result, when the electrical impedance of the food 4 exceeds the threshold value, the control unit 232 detects the burning, that is, determines that the cooking 4 is burnt. When detecting the burning, the control unit 232 generates data (notification data) for notifying that the burning has occurred, and transmits the data to the heating cooker 3 via the communication unit 231.

  The focus detection device 23 is activated when a switch (power switch or the like) (not shown) provided in the cooking utensil 2A for starting the focus detection is turned on by the user, and starts the above operation. .

  The control part 37 of the heating cooker 3 of this embodiment will notify a user of generation | occurrence | production of a burning, if the communication part 35 receives said notification data transmitted from the burning detection apparatus 23 of 2 A of cooking utensils. Specifically, the control unit 37 causes a sound output unit (not shown) included in the operation reception unit 32 to output a warning sound (for example, an electronic sound such as a buzzer sound) or a voice message. In the case of a voice message, for example, it is notified that a burn has occurred, or that it has been automatically stopped or has reduced its thermal power.

  In addition to the output of the warning sound and the voice message, the control unit 37 indicates that the touch panel 321 of the operation receiving unit 32 has been burned, has automatically stopped, or has reduced the thermal power. You may display with a character and an image, you may display LED which the operation reception part 32 is not shown in a predetermined color (for example, red), or blink.

  In addition, the control unit 37 communicates with a mobile terminal (smart phone, tablet terminal, etc.) possessed by the user via the communication unit 35 instead of or in combination with the above notification, and the mobile terminal is not focused. It may be displayed as characters or images that it has occurred, or it has been automatically stopped or reduced in thermal power, or a warning sound or voice message may be output. Alternatively, the control unit 37 may communicate with the HEMS controller via the communication unit 35 to notify the HEMS user interface (an operation terminal such as a tablet terminal) as described above.

  Thus, in Embodiment 2, the focus detection device 23 of the cooking utensil 2 </ b> A is based on the measured electrical impedance of the cooking 4 and the surface temperature of the cooking 4 measured by the temperature sensor 24. Detects sticking. For this reason, even if the food 4 is a solid food such as beef, pork, chicken or hamburger with a low sap, it can accurately detect scoring.

  In addition, since the temperature of the food 4 is measured by the temperature sensor 24 provided in the cooking utensil 2A, the correction value can be calculated using a temperature that approximates the actual surface temperature of the food 4, so that the accuracy of the detection of the burning is obtained. Improvement can be achieved.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.

  For example, as shown in FIG. 20, a measurement circuit 38 similar to the measurement circuit 200 in the first embodiment is added to the heating cooker 3 in the first embodiment so that the electric impedance can be measured by the heating cooker 3. Also good. In this case, although the cooking utensil 2B is provided with the electrodes 21a and 21b, the impedance measuring device 20 is not necessary.

  The top plate 31 of the heating cooker 3 in the above case is provided with conductors 310 a and 310 b that are electrically connected to the measurement circuit 38 in a manner exposed on the surface of the top plate 31. The distance between the conductors 310a and 310b on the surface of the top plate 31 is substantially the same as the distance between the electrodes 21a and 21b. For this reason, when the cooking utensil 2B is placed on the top plate 31, the electrodes 21a and 21b and the conductors 310a and 310b can be brought into contact with each other, and the electrical impedance of the food 4 can be measured. Note that at least one side of the electrodes 21a and 21b and the conductors 310a and 310b may be formed of a magnet to induce contact.

  The cooking utensil of the present invention is not limited to a frying pan, and may be a pan-shaped object.

  The heating cooker of the present invention may be a product in which the heating cooker and the cooking utensil are integrated, such as a hot plate, an electric griddle, a grill pan, etc. The heating cooker in that case is, for example, the embodiment 1 The cooking appliance 2 and the heating cooker 3 are integrated.

  The cooking device of the present invention is not limited to an IH cooking device, and may be a gas cooking device or a radiant heater type cooking device.

  In addition, in the detection of burning by the heating cooker 3 of the first embodiment and the burning detection device 23 of the second embodiment, not only the electrical impedance of the food 4 but also L (inductance), C ( Any one component of capacitance) and R (resistance) may be adopted. For example, when the R component is employed, the impedance measuring device 20 and the focus detection device 23 may be provided with a DC power supply instead of the oscillator 210 and the voltage sensor 211, and the product cost can be reduced. It has been found through experiments that the R component and the L component of the electrical impedance also tend to increase as the scoring increases, and the C component tends to decrease as the scoring increases. Yes.

  Moreover, you may make it implement | achieve all or one part of each function part (refer FIG. 10) of the control part 37 with which the heating cooker 3 of Embodiment 1 is provided with exclusive hardware. The dedicated hardware is, for example, a single circuit, a composite circuit, a programmed processor, an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a combination thereof.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

  The present invention can be suitably employed in a cooking system.

  DESCRIPTION OF SYMBOLS 1 Sensing detection system, 2, 2A, 2B Cooking utensil, 3 Cooking device, 4 Cooked food, 5 Odor sensor, 6 Camera, 20 Impedance measuring device, 21a, 21-1a-21-3a, 21b, 21-1b 21-3b Electrode, 22 mark, 23 In-focus detection device, 24, 36 Temperature sensor, 30 Housing, 31 Top plate, 32 Operation accepting unit, 33 Heating coil, 34 Inverter circuit, 35, 201, 231 Communication unit, 37, 202, 232 Control unit, 38, 200, 200-1 to 200-3, 230 Measuring circuit, 203 Electrode switching unit, 210 Oscillator, 211 Voltage sensor, 212 Current sensor, 310a, 310b Conductor, 320 Power button, 321 Touch panel, 370 CPU, 371 ROM, 372 RAM, 373 Secondary storage device 374 port, 375 bus, 3700 impedance acquisition unit, 3701 a temperature acquiring unit, 3702 focus with the detection unit, 3703 a heating reduction unit, 3704 notification unit

Claims (10)

Heating means for heating the cooked food,
Impedance measuring means for measuring the impedance of the food,
Temperature measuring means for measuring the temperature of the food,
Detecting means for detecting the burning of the food based on the measured impedance and a threshold value determined according to the measured temperature;
And a notifying means for notifying the user that the attrition has been detected.   The focus detection system according to claim 1, wherein the detection means detects the focus when the measured impedance exceeds a threshold value determined according to the measured temperature.   The focus detection system according to claim 1, wherein the threshold value is a value obtained by subtracting a correction value obtained by multiplying the measured temperature by a predetermined coefficient from a predetermined reference threshold value. A cooking utensil comprising the impedance measuring means;
A heating cooker comprising the heating means, the temperature measurement means, the detection means, and the notification means;
The cooking utensil further includes transmission means for transmitting the measurement result of the impedance measurement means to the cooking device,
The in-focus detection system according to any one of claims 1 to 3, wherein the heating cooker further includes receiving means for receiving the measurement result from the cooking utensil. A cooking utensil comprising the impedance measuring means and the temperature measuring means;
A heating cooker comprising the heating means, the detection means, and the notification means;
The cooking utensil further includes transmission means for transmitting the measurement results of the impedance measurement means and the temperature measurement means to the cooking device,
The in-focus detection system according to any one of claims 1 to 3, wherein the heating cooker further includes receiving means for receiving the measurement result from the cooking utensil.   The said cooking-by-heating machine is a burning detection system of Claim 4 or 5 further provided with the heating reduction means to stop or weaken the heating to the said food by the said heating means, when the said burning is detected. Further provided with an odor measuring means for measuring odor,
The burn detection system according to any one of claims 4 to 6, wherein the detection unit of the cooking device detects the burn of the food in consideration of the measurement result of the odor measurement unit. It further comprises imaging means for imaging the cooked food,
The burn detection system according to any one of claims 4 to 7, wherein the detection unit of the cooking device detects the burn of the food in consideration of an image captured by the imaging unit. A communication means for communicating with the cooking device;
Impedance measuring means for measuring the impedance of the food,
Temperature measuring means for measuring the temperature of the food,
Detecting means for detecting the burning of the food based on the measured impedance and a threshold value determined according to the measured temperature;
And a notification means for notifying the heating cooker that the burning has been detected. Impedance measurement means measures the impedance of the food,
The temperature measuring means measures the temperature of the food,
The detection means detects the burning of the food based on the measured impedance and a threshold value determined according to the measured temperature,
A focus detection method, wherein the notification means notifies the user that the focus has been detected.

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