JP5724799B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker that uses a weight detection means to determine a spill.

  As a conventional cooking device, a plurality of weight detection means for detecting the weight of the top plate are provided, and the output of the heating means is calculated based on the weight value of the mounted object calculated from the weight values detected by the plurality of weight detection means. There exists what heats, controlling (for example, refer patent document 1).

JP 2006-253007 A (Claim 1, paragraph 0010)

  However, in the conventional cooking device, since the total value of the weight of the table including the top plate and the object to be heated and the cooked item is used, when the cooked item is spilled on the top plate from the object to be heated, If the weight on the plate does not change, the output control of the heating means is not performed even if the state of the food changes. Therefore, for example, even if the food is spilled, the heating operation may be continued without changing the heating power. Then, when the heating operation is continued in a state where the cooked product is spilled from the heated object, there is a problem that the spilled cooked product enters the bottom surface of the heated object and burns the bottom surface and the top plate.

  The heating cooker according to the present invention is made to solve the above-described problems. Even when the spillage of the cooked food in the article to be heated occurs, the spillage is detected and based on the result. The purpose is to perform heating control.

  A heating cooker according to the present invention is provided below a top plate on which a heated object to be cooked is placed, and has heating means for heating the heated object, a cooked object and a food placed on the top plate. A weight detecting means for detecting the weight of the placed object including the heated object, a control means for calculating a center of gravity position and a weight of the placed object from a detection value of the weight detecting means, and controlling a heating operation of the heating means; and at least the placed object A spillage determination unit that determines that the spillage has occurred when the position of the center of gravity changes and the weight of the mounted object does not substantially change, and the control unit controls the heating operation of the heating unit based on the determination result of the spillage determination unit .

  According to the heating cooker according to the present invention, the spillage determination unit performs the spillage determination from the change in the center of gravity position and weight of the placed object detected by the weight detection unit, and the control unit performs heating based on the determination result of the spillage determination unit. Since the heating operation of the means is controlled, it is possible to prevent the heating operation from continuing when the cooked product is spilled from the object to be heated, and to prevent the object to be heated and the top plate from being burnt due to the spill.

It is a perspective view explaining the installation state of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a perspective view of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a block block diagram of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is the front view and top view explaining the installation state of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a flowchart which shows the calculation operation | movement of the mounting position and weight which concerns on Embodiment 1 of this invention. It is a figure explaining the calculation example of the mounting position and weight of the mounting object by the weight sensor which concerns on Embodiment 1 of this invention. It is a figure explaining the modification of arrangement | positioning of the weight sensor which concerns on Embodiment 1 of this invention. It is a figure which shows that the gravity center position of the mounting object concerning Embodiment 1 of this invention moved. It is a flowchart which shows the detection operation | movement which detects the overflowing which concerns on Embodiment 1 of this invention. It is a block block diagram which shows the structure of Embodiment 2 of this invention. It is a flowchart which shows the operation | movement which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, based on FIGS. 1-7, the structure and operation | movement of the heating cooker which concern on Embodiment 1 of this invention are demonstrated.
FIG. 1 is a perspective view for explaining an installation state of the induction heating cooker 10 according to the first embodiment.
As shown in FIG. 1, the induction heating cooker 10 according to the first embodiment is assumed to be a built-in type that is used by being installed in an installation port 110 that is an installation space formed in the kitchen 100.
FIG. 2 is a perspective view of the induction heating cooker 10.
FIG. 3 is a block diagram showing the inside of the induction heating cooker 10 in a simplified manner.
As shown in FIG. 2, the induction heating cooker 10 has an outer shape formed by a box-shaped main body 1. The upper surface of the main body 1 is opened. Inside the main body 1, a control unit 9, a driving unit 15, and heating coils 8a, 8b, and 8c as heating means (hereinafter referred to as "heating coil 8" when not distinguished). ), Power detection units 11a, 11b, and 11c (hereinafter referred to as “power detection unit 11” when not distinguished from each other) and notification means 12. The control unit 9 corresponds to the control means of the present invention.

  Next, a top plate 2 is mounted on the upper part of the main body 1 and is composed of heat-resistant glass and a metal frame so as to cover the opening of the main body 1 and on which a heated object 4 such as a pan is placed. Yes. The top plate 2 is formed larger than the opening of the main body 1.

Next, heating holes 3a, 3b, 3c (showing heating areas corresponding to positions where the heating coils 8a, 8b, 8c in the main body 1 are accommodated are shown in the hatched portions on the surface of the top plate 2. Hereinafter, when not distinguished, it is referred to as “heating port 3”).
The heating port 3 is an indication for the user to place an object to be heated on this area. In the first embodiment, the heating ports 3a and 3b are relatively heated by the corresponding heating coils 8a and 8b. Since the output is set to be large, the display area is large, and the heating port 3c has a small display area because the corresponding heating coil 8c is set to have a relatively small heating output relative to the two heating coils 8a and 8b. . In the first embodiment, one heating coil 8 is disposed for one heating port 3, but a plurality of heating coils 8 may be disposed for one heating port 3. Absent.

Next, weight sensors 5 a, 5 b, 5 c, 5 d as weight detection means counterclockwise from the upper left as viewed from the top (hereinafter referred to as “weight sensor 5” when not distinguished) are provided at the four corners on the back side of the top plate 2. Is provided).
The weight sensor 5 is composed of a strain gauge, for example, and outputs a voltage value corresponding to the weight (load). The weight sensor 5 is not limited to this, and any component can be used as long as it detects the weight. For example, a capacitive load sensor may be used.

  Next, on the upper front side of the top plate 2, there are provided a display unit 7 for displaying information such as an input operation and a set thermal power state, and an operation unit 6 for inputting an operation related to heating control for each heating port 3. It has been. The display unit 7 is composed of, for example, a liquid crystal panel (LCD) or an LED. The operation unit 6 includes a touch switch made of an electrode such as a transparent conductive film, for example, and detects an input operation based on a change in capacitance when a user's finger or the like approaches the electrode placement position. . Note that the operation unit 6 is not limited to a touch switch, and may be, for example, a contact button using a membrane sheet, or may be provided with a dial for adjusting heating power, a switch for operating various cooking settings, and the like. The operation unit 6 may be disposed on the front side of the main body 1.

Moreover, the heating coil 8 is comprised by the induction heating coil wound by the spiral shape, and the to-be-heated material 4 is induction-heated by supplying a high frequency current.
In the first embodiment, an induction heating cooker that performs induction heating by flowing a high-frequency current through a heating coil 8 as a heating unit will be described. However, the present invention is not limited to this, and for example, as a heating unit, You may make it use the electric heater (For example, a nichrome wire, a halogen heater, a radiant heater) using the radiation-type heat source heated with radiation.

  Each weight sensor 5, operation unit 6, display unit 7, drive unit 15, and notification unit 12 are connected to the control unit 9. This control part 9 is comprised, for example with a microcomputer etc., and performs the heating command to the drive part 15 based on the input from the operation part 6. FIG. The control unit 9 includes a spillage determination unit 9 a that determines the spillage of the article to be heated 4 based on the detection value of each weight sensor 5. Note that the spillage determination means 9a does not need to be a separate component from the control unit 9, and the control unit 9 only needs to have a function of determining spillage.

  Moreover, the alerting | reporting part 12 is comprised by a buzzer, a speaker, etc., for example, and emits the guidance message regarding a cooking operation | movement, an alarm sound, etc. by control from the control part 9. FIG. In addition, when notification is performed by lighting of light such as an LED or a sentence, the notification may be performed integrally with the display unit 7.

Further, the drive unit 15 has an inverter circuit for each heating coil 8. And according to the heating command from the control part 9, the electric power supplied from the power supply circuit which is not shown in figure is converted, and a high frequency current is supplied to each heating coil 8. FIG.
The power supply from the power supply circuit to each inverter circuit is on / off controlled for each inverter circuit under the control of the control unit 9.

  Moreover, the electric power detection parts 11a, 11b, and 11c detect the electric power input into the corresponding heating coils 8a, 8b, and 8c, respectively. The power detection unit 11 calculates the power supplied to the heating coil 8 from the values of current and voltage supplied to the inverter connected to the heating coil 8, for example. The power detection unit 11 may be integrated with the control unit 9.

Next, the attachment to the kitchen 100 of the induction heating cooking appliance 10 is demonstrated using FIG. 1 and FIG.
FIG. 4 is a front view and a top view for explaining the installation state of the induction heating cooker 10.
The induction heating cooker 10 configured as described above is installed by being fitted into the installation port 110 of the kitchen 100 shown in FIG. 1, for example. As shown in FIG. 4, when the induction heating cooker 10 is arranged in the kitchen 100, the top plate 2 is placed on the upper surface of the kitchen 100.

When the induction heating cooker 10 is fitted into the installation port 110, the top plate 2 is supported on the upper surface of the kitchen 100 via the weight sensors 5, and the induction heating cooker 10 is supported in a suspended state on the upper surface of the kitchen 100. . That is, the load of the induction heating cooker 10 is applied to the upper surface of the kitchen 100 via the weight sensor 5 disposed on the top plate 2. When the object to be heated 4 is placed on the top plate 2, the weight (load) is applied to the upper surface of the kitchen 100 via the weight sensor 5. That is, the detection value of each weight sensor 5 changes according to the weight of the article 4 to be heated. Here, the reason why the weight sensor 5 is supported on the upper surface of the kitchen 100 is that the detection accuracy is lowered unless the weight sensor 5 is installed in a flat and hard place. The position where the weight sensor 5 is provided is not limited to the corner, and the weight sensor 5 may be provided at a position where the top plate 2 is supported on the upper surface of the kitchen 100 via each weight sensor 5.
The peripheral edge of the opening of the main body 1 is bent outward in an L shape to form a flange, and the flange and the top plate 2 are fixed with, for example, screws, and the flange is placed on the upper surface of the kitchen 100. And you may make it support the load of the induction heating cooking appliance 10. FIG. Also in this case, the top plate 2 is supported on the upper surface of the kitchen 100 via the weight sensors 5 by disposing the weight sensor 5 on the lower surface side of the flange portion.

  Next, using FIG. 5 and FIG. 6, the operation in which the control unit 9 according to the first embodiment calculates the placement position of the placement object (that is, the center of gravity of the article 4 to be heated) and the weight will be described. The placed object is a general term for what is placed on the top plate 2, and includes the heated object 4 and the cooked food in the heated object 4.

(Loading position / weight calculation)
FIG. 5 is a flowchart showing an operation in which the control unit 9 according to the first embodiment calculates the placement position / weight of the placement object.

(S101)
After the induction heating cooker 10 is turned on, the control unit 9 reads the detection value of each weight sensor 5 in step S101.

(S102)
Next, in step S102, the control unit 9 determines whether or not there is a change in the read detection value.
If it is determined that there is no change in the detected value, the process returns to step S101, and reading of the detected value is repeated.
In addition to the fluctuation of the detection value, for example, a detection value in a state where there is no mounted object on the top plate 2 is stored in advance, and if the stored detection value and the read detection value are not the same, detection is performed. You may make it judge that there exists a fluctuation | variation of a value. Thereby, even if it is a case where the power supply of the induction heating cooking appliance 10 is turned on in the state by which the mounting object was already mounted, mounting of a mounting object can be determined.

(S103)
If it is determined that there is a variation in the detection value, the control unit 9 calculates the placement position and weight of the placement object based on the detection value of each weight sensor 5 in step S103.

Next, a calculation example of the placement position and weight of the placement object will be described with reference to FIG.
FIG. 6 is a diagram for explaining an example of calculating the placement position and weight of the placement object by the weight sensor 5 according to the first embodiment.
In FIG. 6, Wa, Wb, Wc, and Wd are the coordinate positions of the weight sensors 5a, 5b, 5c, and 5d with the horizontal axis passing through the origin as the X axis, the vertical axis as the Y axis, and the weight sensor 5b as the coordinate origin. Is shown. That is, the distance between the weight sensors in the X-axis direction is Xm, and the distance between the weight sensors in the Y-axis direction is Ym.
Further, M represents the coordinate position (center of gravity) of the center of gravity of the placed object, and Mg represents the weight of the placed object.

Here, the weight Mg of the mounted object is the sum of the amount of change in the weight detected from each weight sensor 5. When the amount of change in weight detected by Wa, Wb, Wc, and Wd is M1, M2, M3, and M4, respectively, the weight Mg of the mounted object can be obtained by the following equation.
Mg = M1 + M2 + M3 + M4 Formula (1)

The moment about the Y axis (Xg × Mg) of the mounted object and the moment about the X axis of the mounted object (Yg × Mg) can be obtained by the following equations.
Xg × Mg = Xm × M3 + Xm × M4 Formula (2)
Yg × Mg = Ym × M1 + Ym × M4 Formula (3)

Accordingly, the coordinate position M (Xg, Yg) of the mounted object can be obtained from the following equations from the above equations (2) and (3).
Xg = Xm × (M3 + M4) / Mg Formula (4)
Yg = Ym × (M1 + M4) / Mg Formula (5)

  When the coordinate position M, which is the position of the center of gravity of the placement object, is within a heatable range from the center of any of the heating coils 8a, 8b, 8c, the placement object is placed above the heating coil 8. That is, it is determined that the placed object and the heating coil 8 are facing each other.

  By carrying out such a flow, the placement position (center of gravity) and the weight of the placement object can be calculated based on the detection result of the weight sensor 5.

FIG. 7 shows a modification of the arrangement of the weight sensor 5 in the first embodiment.
In the above description, the position of the center of gravity of the placed object is obtained using the four weight sensors 5a, 5b, 5c, and 5d. However, if at least three weight sensors 5 are arranged, the following is performed. The position of the center of gravity of the mounted object on the top plate 2 can be obtained by Expression (6) and Expression (7).

…式（６）

... Formula (6)

…式（７）

... Formula (7)

  For example, as shown in FIG. 7, when the gravity center position is measured by the three weight sensors 5 of Wa (X1, Y1), Wb (X2, Y2), and Wc (X3, Y3), the detected weights are M1, M2, The coordinates (Xg, Yg) of the center of gravity of the placed object in the case of M3 can be obtained by the following equations (8) and (9).

…式（８）

... Formula (8)

…式（９）

... Formula (9)

  Next, changes on the top plate 2 when the cooked food of the article to be heated 4 is spilled will be described with reference to FIG.

FIG. 8 is a diagram showing a change on the top plate 2 before and after spilling. FIG. 8A is a top view of the induction heating cooker 10 before the spilling occurs, and FIG. 8B is a top view of the induction heating cooker 10 after the spilled food in the article to be heated 4 is spilled. is there.
As shown in FIG. 8 (b), when the cooked product spills from the article to be heated 4, the cooked article spreads further along the article to be heated 4. Therefore, compared to the center of gravity position M of the placed object shown in FIG. 8A, in FIG. 8B, the center of gravity position of the placed object in which the cooked item spreads outside changes to Mp. And even if it compares before and after spilling, since it is not changed that it is the to-be-heated material 4 and the cooking thing that are mounted on the top plate 2, there is almost no change of a weight on the top plate 2. FIG. That is, when a spill occurs, only the position of the center of gravity of the placement object changes while the weight of the placement object detected on the top plate remains substantially unchanged.

Next, in the case where an object to be placed is placed on the heating port 3, it is determined by the detection output of the weight sensor 5 that the spillage determination unit 9 a has spilled the cooked food of the heated object 4, and the determination Based on the result, the operation of stopping the driving of the heating coil 8 or reducing the heating power setting to a heating power that does not cause spillage will be described.
FIG. 9 is a flowchart showing a detection operation for detecting a spillage according to the first embodiment.

(S111)
When a heating operation is performed on the heating coil 8 by an operation from the user, the control unit 9 issues a heating command to the drive unit 15 based on the operation input from the operation unit 6 in step S111. The drive unit 15 drives the heating coil 8 based on the heating command. Thereby, the to-be-heated material 4 is induction-heated.

(S112)
Next, in step S <b> 112, the control unit 9 calculates the weight Mg and the center of gravity M of the mounted object facing the heating coil 8 that is being driven based on the detection value of each weight sensor 5.
The calculation of the weight Mg and the center of gravity M is performed from the detected value of the weight sensor 5 based on the detection value of the weight sensor 5 by the same operation as the placement position / weight calculation operation described in step S103 of FIG. 5 and FIG. Calculate the weight and center of gravity of the placed object. This calculation operation is repeated at a sampling interval set in the control unit 9 in advance.

(S113)
Next, in step S113, the spillage determination unit 9a determines that the movement change amount ΔM of the placement object from the original center of gravity M is equal to or greater than the spillage determination threshold Mth obtained in advance through experiments or the like and stored in the spillage determination unit 9a. Judge whether there is. This is because the center of gravity of the article to be heated 4 changes as the amount of spillage increases. That is, if the expression ΔM <Mth is satisfied, the overflow determination unit 9a determines that there is no change in the gravity center position, and the control unit 9 and the overflow determination unit 9a repeat steps S111 to S113.

(S114)
On the other hand, if ΔM ≧ Mth, the overflow determination unit 9a determines that the position of the center of gravity of the mounted object has changed, and proceeds to step S114. In step S114, the spill determining unit 9a determines whether the calculated weight change amount ΔMg is within the spill determining range set in advance in the spill determining unit 9a, that is, whether Mgth1 <ΔMg <Mgth2 is satisfied. Judge whether or not. The threshold values Mgth1 and Mgth2 used for this determination may be values that can determine that the change in the weight of the object to be heated 4, that is, the object placed on the top plate 2, is small (for example, from 0 to 5 grams). In addition, since the weight Mg and the center of gravity M of the placed object are calculated in step S112 in advance, it is temporarily determined in step S114 whether the weight change amount ΔMg is within the spillage determination range. Even in such a case, it is performed in a short time so that the weight does not change much by evaporation.

  When the change amount ΔMg of the mounted object does not satisfy the formula Mgth1 <ΔMg <Mgth2, the process returns to step S111, and the control unit 9 and the overflow determination unit 9a repeat steps S111 to S114. This is because, when ΔMg does not satisfy the formula Mgth1 <ΔMg <Mgth2, the position of the center of gravity of the placement object calculated in step S113 has changed, and the object 4 to be heated is newly placed on the top plate 2. This is because the heated object 4 that has been or has already been placed is considered to have been removed. On the other hand, when the amount of change ΔMg of the mounted object satisfies the formula Mgth1 <ΔMg <Mgth2, the process proceeds to step S115.

(S115)
In step S115, the spillage determination unit 9a determines whether or not the change amount ΔW of the detected power in the power detection unit 11 is smaller than the spillage determination threshold value Wth obtained in advance through experiments or the like and stored in the spillage determination unit 9a. Judging.
If ΔW is greater than Wth, the process returns to step S111.

  Here, the small change ΔW in the detected power indicates that the heating state such as the placement position of the article 4 to be heated has not changed. For example, when the object to be heated 4 deviates from the heating port 3 due to the user's cooking operation, circuit constants such as impedance and inductance determined by the positional relationship between the heating coil 8 and the object to be heated 4 change. Therefore, the input power also changes, and the detected power change ΔW also increases.

(S116)
On the other hand, if the change ΔW in the detected power is smaller than Wth, the spillage determination means 9a determines in step S116 that the spillage has occurred, and based on the determination result, the control unit 9 mounts the object to be heated 4. The heating command corresponding to the installed heating port 3 is stopped, or a heating command is given to reduce the heating power setting to a heating power that does not cause spillage.

(S117)
In step S117, the drive unit 15 stops driving the heating coil 8 or reduces the heating output based on the heating command from the control unit 9.

(S118)
After stopping the operation of the heating coil 8 corresponding to the heating port 3 where the spilling has occurred, the controller 9 determines whether or not the other heating port 3 is performing the heating operation in step S118. When the other heating port 3 is not operating, the process returns to step S111.

(S119)
On the other hand, when the other heating port 3 is operating, the process proceeds to step S119, and the control unit 9 stops the heating operation of the heating coil 8 corresponding to the heating port 3 in operation other than the heating port 3 where the spilling has occurred ( It is confirmed whether the user has set whether the heating power is reduced or the heating is continued as it is. For example, the user selects the operation setting of the heating ports 3 other than the heating port 3 where the user has detected the spilling by operating the operation unit 6 before starting cooking or during cooking. To set. If the heating coil 8 corresponding to the heating port 3 in operation other than the heating port 3 where the spilling has occurred is set to continue heating, the process returns to step S111.

(S120)
If it is set in step S119 that heating of the heating coil 8 corresponding to the heating port 3 in operation other than the heating port 3 where the spilling has occurred is set to stop or reduce the heating power, the control unit 9 sets the heating port in operation. The heating command corresponding to 3 is stopped, or a heating command for reducing the heating power setting to a heating power that does not cause spillage is performed. The drive unit 15 stops driving the heating coil 8 or reduces the heating output based on the heating command from the control unit 9.

As described above, in the first embodiment, the weight and the placement position of the placement object are obtained based on the measurement result of the weight sensor 5, and the overflow determination unit 9a determines that the change amount ΔM of the center of gravity position of the placement object is in advance. The spillage determination threshold value Mth that is obtained by an experiment or the like and is stored in the spillage determination unit 9a, and the weight change amount ΔMg of the mounted article is within the spillage determination range Mgth1 < If Mg <Mgth2 is satisfied, that is, if the position of the center of gravity of the object on the top plate 2 has changed and there is almost no change in weight, it is determined that the object has been spilled, and the control unit 9 determines that the object has been mounted based on the result. The heating operation of the heating coil 8 corresponding to the placed heating port 3 is controlled.
As a result, it is possible to prevent the state in which the cooked product has been spilled from the heated object 4, so that the bottom of the heated object 4 and the top plate 2 are not scorched with the spilled cooked product, and the top plate 2 and the heated object. 4 can be prevented from being burnt.

  In the first embodiment, the spillage determination unit 9a has a new object to be heated 4 placed on another heating port 3 on the top plate 2 or has already been placed on another heating port 3. In order not to determine that the movement of the center of gravity of the mounted object due to the removal of the object to be heated 4 is spilled, the change in weight on the top plate 2 is also used as a material for determining spillage. For example, there is only one heating port 3. When the configuration of the first embodiment is applied to a non-heating cooker 10, the spillage determination unit 9 a may determine the spillage only by moving the center of gravity position of the object on the top plate 2.

  In the first embodiment, the spillage can be determined only by the change in the center of gravity and the weight of the object placed on the top plate 2, but in addition to these conditions, the spillover determination unit 9 a is detected by the power detection unit 11. When the power change amount ΔW is smaller than the spillage determination threshold value Wth obtained in advance through experiments or the like and stored in the spillage determination unit 9a, that is, it can be determined that the spillage is present if the detected power does not change substantially. By doing in this way, in addition to the detection result of the weight sensor 5, since the change in the input power is also added to the determination of the presence or absence of spilling, it becomes possible to more reliably distinguish between operations such as panning and spilling, The accuracy of the spillage determination is improved. The spillage determination unit 9a may determine that the spillage is present when the ratio of the power detected by each power detection unit 11 is not substantially changed instead of the change ΔW in the detected power. This is because the object to be heated 4 is newly placed on the other heating port 3 of the top plate 2 when the ratio of the power detected by each power detection unit 11 changes with the change in the center of gravity position of the placed object. This is because it is considered that the heating coil 8 corresponding to the heating port 3 has been driven.

  Further, after detecting the spill, it is possible to prevent wasteful energy consumption by controlling the control unit 9 to stop heating the heating coil 8 or to reduce the set heating power.

  Further, when the coordinate position M of the mounted object is within a heatable range from the center of any of the heating coils 8a, 8b, and 8c, and the heating coil 8 on which the mounted object is mounted is driven, Since the overflow detection is started, the possibility of erroneous detection of the overflow can be reduced.

  Further, since the weight sensor 5 is disposed at the four corners on the back surface side of the top plate 2, the weight sensor 5 is less affected by the magnetic field and temperature during the induction heating operation by the heating coil 8. And the weight can be detected more accurately.

  Further, in the first embodiment, when the spillage determination unit 9a determines that the spillage has occurred, the control unit 9 controls the heating operation of the heating coil 8 corresponding to the heating port 3 where the spillage has occurred, and during other heating operations. When the heating port 3 is present, the heated object placed on the other heating port 3 by the spilled food reaching the other heating port 3 by operating to stop the heating port 3 4 and the top plate 2 can be prevented from burning.

  Further, when there is another heating port 3 in operation, the control unit 9 is configured to perform the heating operation to the heating port 3 in other operation based on the setting performed by the user with the operation unit 6. So, you can select the operation setting according to the cooking content. Normally, when the spilling is detected, the other heating port 3 should also be stopped, and the cooking content will affect the quality when the heating is stopped. Can be set freely, for example, so as not to stop, so that the convenience as a cooking device can be further improved.

  When the spill is detected, only the heating port 3 (3a to 3c) arranged on the top plate 2 is used as the heating port 3 to be controlled to stop or reduce the heating power, and the grill portion 13 shown in FIG. The grill portion heating means that is housed inside and heats the inside of the grill portion 13 may be set so as not to be a control target at the time of detecting the overflow. As a result, it is possible to prevent / suppress the heating port 3 on the top plate 2 when the spilling is detected. Further, even when the spilling is detected, the grilling portion 13 is not related to the burning of the top plate. Since cooking can be continued, the quality of the cooked food cooked in the grill 13 is not impaired.

Embodiment 2. FIG.
In the second embodiment, in addition to the change in the center of gravity and weight of the mounted object, the spillage is determined based on the temperature of the article 4 to be heated, and the driving of the heating coil 8 is stopped, or the thermal power setting does not spill over. Reduce to such a firepower.

FIG. 10 is a block configuration diagram of induction heating cooker 20 according to the second embodiment.
As shown in FIG. 10, the induction heating cooker 20 according to the second embodiment detects the temperature of the object to be heated 4 instead of the power detection unit 11 shown in FIG. 2 of the first embodiment. Temperature detection units 12a, 12b, and 12c (hereinafter referred to as “temperature detection unit 12” when not distinguished) are provided.
Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same portions.

The temperature detectors 12a, 12b, and 12c are formed of, for example, a thermistor, and contact the lower surface of the top plate 2 to change the temperature of the object to be heated 4 placed on the heating ports 3a, 3b, and 3c from the bottom surface side. Measure.
In addition, the temperature detection part 12 should just be a thing which can detect the temperature of the to-be-heated material 4 not only in this. For example, the temperature of the object to be heated 4 may be detected in a non-contact manner by detecting infrared rays emitted from the object to be heated 4 using an infrared sensor.

  Hereinafter, the overflow detection / determination operation according to the second embodiment will be described with reference to FIG.

FIG. 11 is a flowchart showing the overflow detection / determination operation according to the second embodiment.
Hereinafter, each step of FIG. 10 will be described.

(S211)
When a heating operation is performed on the heating coil 8 by an operation from the user, the control unit 9 issues a heating command to the drive unit 15 based on the operation input from the operation unit 6 in step S111. The drive unit 15 drives the heating coil 8 based on the heating command. Thereby, the to-be-heated material 4 is induction-heated.

(S212)
Next, in step S <b> 212, the control unit 9 calculates the weight Mg and the center of gravity M of the object to be heated 4 facing the heating coil 8 being driven based on the detection value of each weight sensor 5.
The calculation of the weight Mg and the center of gravity M is performed based on the detection value of the weight sensor 5 and the weight of the object 4 to be heated by the same operation as the placement position / weight calculation operation described in the first embodiment. And calculate the position of the center of gravity. This calculation operation is repeated at a sampling interval set in the control unit 9 in advance.

(S213)
Next, in step S213, the spill determining unit 9a determines that the movement change amount ΔM of the placement object from the original center of gravity position M is equal to or greater than the spill determination threshold Mth obtained in advance through experiments or the like and stored in the spill determining unit 9a. Judge whether there is. This is because the center of gravity of the article to be heated 4 changes as the amount of spillage increases. In other words, if the expression ΔM <Mth is satisfied, the overflow determination unit 9a determines that there is no change in the center of gravity position, and the control unit 9 and the overflow determination unit 9a repeat steps S211 to S213.

(S214)
On the other hand, if ΔM ≧ Mth, the spillage determination unit 9a determines that the center of gravity position of the placement object has changed, and in step S114, the spillage determination part 9a spills the calculated change amount ΔMg of the placement object in advance. It is determined whether or not the spillage determination range set in the determination unit 9a, that is, whether the expression Mgth1 <ΔMg <Mgth2 is satisfied. If the change amount ΔMg of the mounted object does not satisfy the formula Mgth1 <ΔMg <Mgth2, the process returns to step S211 and the control unit 9 and the overflow determination unit 9a repeat steps S211 to S214. The threshold values Mgth1 and Mgth2 used for this determination may be values that can determine that the change in the weight of the object to be heated 4, that is, the object placed on the top plate 2, is small (for example, from 0 to 5 grams). In addition, since the weight Mg and the center of gravity M of the placed object are calculated in advance in step S212, it is temporarily determined in step S214 whether the weight change amount ΔMg is within the spillage determination range. Even in such a case, it is performed in a short time so that the weight does not change much by evaporation.

(S215)
When the amount of change ΔMg of the heated object 4 in step S214 satisfies Mgth1 <ΔMg <Mgth2, the control unit 9 determines that the temperature T of the heated object 4 detected by the temperature detection unit 12 is higher than the temperature Tth. Judge whether it is high. Here, the temperature Tth is a temperature for determining that the spill is over, and is actually set to a temperature for determining whether or not the temperature of the cooked food of the article to be heated 4 has reached a boiling temperature. For example, when the bottom surface temperature of the object to be heated 4 is Tth, if this Tth is set to 90 ° C., the temperature of the cooked food in the object to be heated 4 is 90 ° C. or less, so that it is boiled and spilled. is not. If the detected temperature T is lower than Tth, the process returns to step S211.

(S216)
If the temperature T detected by the temperature detection unit 12 is equal to or higher than the temperature Tth, it is determined that there is a spill, and the spill determination unit 9a determines that a spill has occurred in step S216, and the control unit based on the determination result. 9 performs a heating command to stop the driving of the heating coil 8 corresponding to the heating port 3 on which the article to be heated 4 is placed, or to reduce the heating power setting to a heating power that does not cause spillage.

(S217)
In step S217, the drive unit 15 stops driving the heating coil 8 or reduces the heating output based on the heating command from the control unit 9.

  In the second embodiment, it is needless to say that the same control as that in steps S118 to S120 shown in the first embodiment can be performed after step S216.

  The induction heating cooker 20 according to the second embodiment includes the power detection unit 11, and the spillage determination unit 9a determines the spillage from the change in the detected power in the power detection unit 11 described in the first embodiment. It may be added to the conditions.

As described above, in the second embodiment, in addition to the detection result of the weight sensor, the temperature of the article to be heated 4 (cooking object temperature) detected by the temperature detection unit 12 is also determined to be spilled in addition to the presence / absence determination of spillage. As a result, when the temperature of the article to be heated 4 is lower than the temperature at which water boils, that is, when there is no possibility of spilling, it is possible to determine that the change in the center of gravity or weight of the object to be placed is a disturbance. Therefore, it is possible to more reliably determine the presence or absence of spillage without erroneous determination.
Each embodiment may be realized by appropriately combining the embodiments.

  DESCRIPTION OF SYMBOLS 1 Main body, 2 Top plate, 3 Heating port, 4 To-be-heated object, 5 Weight sensor, 6 Operation part, 7 Display part, 8 Heating coil, 9 Control part, 10 Induction heating cooker, 11 Electric power detection part, 12 Temperature detection Part, 13 grill part, 15 drive part, 20 induction heating cooker, 10 kitchen, 110 installation port.

Claims (6)

A heating means provided below a top plate on which a heated object to be cooked is placed; and heating the heated object;
A weight detecting means for detecting the weight of the object to be cooked and the object to be heated placed on the top plate;
Control means for calculating the center of gravity position and weight of the figurine from the detection value of the weight detection means, and controlling the heating operation of the heating means;
A spillage determination unit that determines that spillage has occurred when the position of the center of gravity of the figurine changes at least and the weight of the figurine does not substantially change,
The cooking device according to claim 1, wherein the control unit controls a heating operation of the heating unit based on a determination result of the spillage determination unit. Comprising a power detection unit for detecting the input power to the heating means;
The spillage determination unit determines that spillage has occurred when the center of gravity position of the figurine changes and the weight of the figurine does not change substantially, and the power detected by the power detection unit does not change substantially. The cooking device according to claim 1. Temperature detecting means for detecting the temperature of the object to be heated;
In the case where the center of gravity position of the figurine is changed and the weight of the figurine is not substantially changed, and the detection value of the temperature detecting means exceeds the temperature at which water is boiled or is likely to boil The heating cooker according to claim 1, wherein it is determined that the spilled over. A plurality of heating means,
The cooking device according to any one of claims 1 to 3, wherein the control means controls heating operations of all the heating means being driven based on a determination result of the spillage determination unit. An operation unit for sending a signal to the control means;
The said control means controls the heating operation of all the said heating means currently driven based on the setting performed in the said operation part, if it determines with the said spilling determination part having overflowed. The cooking device described. A grill heating means for heating the inside of the grill is provided,
The control means performs heating control of the heating means and the grill heating means,
The cooking device according to any one of claims 1 to 5, wherein the control means continues the heating operation of the grill heating means even after the spillage determination unit determines that spillage has occurred.

Images