JP2005019292A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a trouble such as misunderstanding by a user as mysterious action, the badness of user-friendliness, and the cause of a customer call for how-to-use, by giving a control signal for stopping a heating amount of a current flowing coil and by checking a boiling state based on control information. <P>SOLUTION: The heating cooker comprises a heating cooker body 2 provided with a top plate 3 for mounting a heating vessel 6 on the upper part, a heating means 1 for heating and cooking a heated object in the heating vessel 6, a vibration sensor 7 for detecting the level of vibration transmitted to the heating cooker body 2, a temperature sensor 9 for detecting the temperature of the top plate 3, and a boiling detection means 10 which detects the boiling state of the heated object in the heating vessel 6 based on the output of the vibration sensor 7, and on the condition that the detected temperature of the temperature sensor 7 is a prescribed temperature or higher, finally decides the boiling detection of the heated object. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooking device having an induction heating (hereinafter referred to as IH cooking device) type, a halogen heater or the like as a heat source.
[0002]
[Prior art]
Conventionally, this type of cooking device includes a top plate on which the cooking container is placed, a plurality of heating means for heating the cooking container, a vibration sensor for detecting the vibration of the cooking container through the top plate, and this vibration. The boiling detection means for detecting the boiling state of the object to be heated by the output of the sensor, and the output of the boiling detection means and the control information of the energizing coil indicate which heating means is heated by the heating means. What is provided with the boiling position detection means to discriminate | determine is known. There is also known a cooking device that includes a temperature sensor on the lower surface of the top plate and detects the boiling state of the object to be heated by using the temperature sensor and the vibration sensor (see, for example, Patent Document 1).
[0003]
Here, the vibration sensor is provided in close contact with the back surface of the top plate to detect the boiling state of the object to be heated, and the boiling position detecting means temporarily stops the heating amount of the energizing coil when the control information of the energizing coil is detected. Or it is reduced and it is discriminate | determined whether the to-be-heated material heated by which heating means is boiling. The temperature sensor determines boiling when the output of the vibration sensor is present when the temperature signal is rising.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2003-77644 (Page 2, FIGS. 3 and 5)
[0005]
[Problems to be solved by the invention]
However, since the conventional cooking device has the vibration sensor in close contact with the top plate, there has been a problem that the rise of the temperature of the top plate causes malfunction of the vibration sensor or exceeds the heat-resistant temperature to cause a failure.
[0006]
The boiling position detecting means gives a control signal for stopping or reducing the heating amount of the energizing coil, and checks the boiling state based on the control information. As described above, since the heating amount of the energizing coil is temporarily stopped or reduced, there is a high possibility that it is perceived as an operation that is incomprehensible to the user, which causes inconveniences such as poor usability and how-to calls.
[0007]
Furthermore, the temperature sensor determines the boiling state due to the temperature rise, but when a plurality of heating ports are simultaneously rising in temperature, it detects which heating port is boiling or vibration due to disturbance. It was difficult.
[0008]
The present invention has been made to solve such problems, and prevents occurrence of malfunction of the vibration sensor and the like, and the object to be heated in the heating container without being affected by disturbance vibration or simultaneous heating of a plurality of ports. It is an object of the present invention to provide a cooking device capable of accurately detecting the boiling state of the food.
[0009]
[Means for Solving the Problems]
The heating cooker according to the present invention includes a heating cooker body provided with a top plate for placing the heating container thereon, heating means for cooking the object to be heated in the heating container, and the heating cooker body. A vibration sensor that detects a transmitted vibration level, a temperature sensor that detects the temperature of the heating container or the temperature of the top plate that contacts the heating container, and the object to be heated in the heating container is in a boiling state based on the output of the vibration sensor And a boiling detection means for determining the boiling detection of the object to be heated on condition that the detected temperature of the temperature sensor is equal to or higher than a predetermined temperature.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a heating cooker according to the invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
1 is a cross-sectional view showing a configuration of a heating cooker according to Embodiment 1. FIG. FIG. 2 is a graph showing the output waveform of the vibration sensor accompanying the boiling and the output smoothing waveform. Furthermore, FIG. 3 is a flowchart showing the operation of the heating cooker according to the first embodiment.
[0011]
In FIG. 1, the cooking device according to the present embodiment is housed in a box-shaped housing 2 and energized coil 1 which is a heating means wound spirally in one plane, and this energized coil 1. A flat top plate 3 for placing a pan 6 serving as a heating container, heating control means 4 for increasing or decreasing the amount of high-frequency alternating current flowing in the energizing coil 1, and a housing 2 and an operation / display unit 5 for inputting a heating start / stop signal to the heating control means 4 and a signal such as a temperature setting of an object to be heated.
[0012]
Here, a transparent heat-resistant insulating material such as crystallized glass is used for the top plate 3. In addition, on the top surface of the top plate 3, the pan 6 in which the object to be heated is accommodated can be placed at a position facing the energizing coil 1. The pan 6 is generally made of a metal material such as iron, and is placed in an alternating magnetic field formed around the coil as the energizing coil 1 is energized by an instruction from the operation / display unit 5.
[0013]
In addition, the heating cooker according to the present embodiment includes a vibration sensor 7 on the lower surface in the housing 2. The vibration sensor 7 detects vibration due to bubbles generated by boiling of the heated object in the pan 6 placed on the top plate 3. The vibration intensity signal that is the output of the vibration sensor 7 is smoothed by the signal smoothing means 8. FIG. 2 is a schematic diagram showing a waveform smoothed by the signal smoothing means 8 (see “vibration smoothing output waveform” in FIG. 2). The vertical axis represents the vibration raw waveform and the vibration intensity as the output of the signal smoothing means 8, and the horizontal axis represents time. The output of the signal smoothing means 8 is input to the boiling detection means 10. When the boiling detection unit 10 detects a boiling state from the input waveform, the boiling detection unit 10 outputs a signal for lowering or stopping the heating input setting level to the energizing coil 1 via the heating control unit 4.
[0014]
On the other hand, an infrared temperature sensor 9 is provided on the back surface of the top plate 3. The infrared temperature sensor 9 is heated by heat conduction with the heating of the pan 6 placed on the top plate 3 and measures the temperature of the heating surface. This measured temperature output is input to the boiling detection means 10, and the boiling state is detected by mutual information with the input signal from the signal smoothing means 8 of the vibration sensor 7.
[0015]
Next, operation | movement of the heating cooker which concerns on this Embodiment is demonstrated using the flowchart of FIG. First, the pan 6 in which the object to be heated is accommodated is placed on the top plate 3. Then, a cooking selection such as target temperature setting and a start signal are input from the operation / display unit 5, the energizing coil 1 is driven via the heating control means 4 (S101), and heating cooking of the object to be heated is started. When the heating control means 4 energizes the energizing coil 1 with a high-frequency alternating current in accordance with the temperature setting, the entire pan 6 is heated as a heating source by the action of eddy current flowing inside the energizing coil 1. The object to be heated in 6 is heated. At the same time, upon receiving the start signal, the vibration sensor 7 and the infrared temperature sensor 9 start the detection operation (S102).
[0016]
As the object to be heated is heated, fine bubbles are generated at the bottom of the pan when the water temperature in the pan exceeds about 80 ° C. The bottom of the pot is vibrated by an impact when the bubbles are released from the bottom of the pot, and the vibration force is transmitted to the casing 2 through the top plate 3 as a rigid body vibration mode, and the output of the vibration sensor 7 gradually starts to rise. This increase in the vibration intensity signal becomes maximum when the water temperature is about 95 ° C.
[0017]
At 100 ° C., when boiling completely, the bubbles from the bottom of the pot become larger and the excitation force when the bubbles are released from the bottom of the pot is weakened, so the output of the vibration sensor 7 tends to decrease. The vibration intensity signal from the boiling sensor 7 is an alternating half-wave waveform, and an output whose peak value increases with the vibration intensity is obtained. The raw waveform of the boiling sensor 7 is smoothed by the signal smoothing means 8 to obtain the above-described waveform of FIG.
[0018]
The output at which the output of the signal smoothing means 8 gradually increases and reaches the maximum, that is, the time when the water temperature passes through about 95 ° C. and the output decreases is determined as the boiling detection point 100 ° C. by the vibration sensor 7 (S103). After determining the boiling detection by the vibration sensor 7, the boiling detection is determined by the temperature measurement result of the lower surface of the top plate 3 by the infrared temperature sensor 9. That is, since the temperature of the lower surface of the top plate is heated by heat conduction from the pan 6, the temperature output is delayed from the actual heated object temperature when the temperature rises.
[0019]
Therefore, when different amounts of water are boiled using various pots, the temperature of the top plate 3 to be heated at the minimum is obtained in advance by experiment. For example, if this predetermined temperature is set to 80 ° C., whether or not the predetermined temperature is exceeded. (S104), and if it is equal to or higher than a predetermined temperature, boiling detection is confirmed. This operation is performed by the boiling detection means 10, and after the boiling is confirmed, the energization to the energizing coil 1 is stopped via the heating control means 4 (S105), and the operation / display unit 5 performs detection notification and operation. finish.
[0020]
If it is determined by the determination processing in S104 that the temperature is not equal to or higher than the predetermined temperature, it is determined that the vibration noise is a disturbance, and the boiling detection of the vibration sensor 7 is reset (S106). And it returns to the vibration detection routine of S103 again and continues detection.
[0021]
As described above, the cooking device according to the present embodiment can provide accurate vibration detection by the vibration sensor 7 without being affected by the temperature of the top plate 3 by providing the vibration sensor 7 in the housing 2. At the same time, by using the logical product (AND) signal of the vibration sensor 7 and the infrared temperature sensor 9, the vibration source due to the disturbance can be canceled, and malfunction can be effectively prevented. Furthermore, since the disturbance vibration detection is not performed by the method of temporarily stopping the energizing coil 1, the user does not feel any trouble and the usability can be improved.
[0022]
In the present embodiment, the case where the vibration sensor 7 is arranged on the lower surface in the housing 2 has been described. However, the vibration sensor 7 only needs to be able to detect the vibration level transmitted to the main body of the heating cooker except for the top plate 3 that becomes high in temperature, and may be disposed either inside or outside the main body of the heating cooker. . Moreover, although the temperature of the lower surface of the top plate 3 was measured by the infrared temperature sensor 9, the temperature of the pan 6 may be directly measured. Further, a thermistor-type contact temperature sensor may be used without using the infrared temperature sensor 9.
[0023]
Embodiment 2. FIG.
Next, a heating cooker according to Embodiment 2 will be described. FIG. 4 is a flowchart showing the operation of the heating cooker according to the second embodiment. The second embodiment is different from the first embodiment in that the processes of S107 and S108 are added to the flowchart of FIG. Therefore, the hardware configuration of the present embodiment is the same as or equivalent to the configuration of the first embodiment shown in FIG. In addition, the same code | symbol is attached | subjected about the component which is the same as that of Embodiment 1, or equivalent, and the description is abbreviate | omitted.
[0024]
First, the energizing coil 1 is driven (S101), and the vibration sensor 7 and the infrared temperature sensor 9 are operated (S102). Next, it is determined whether or not the output of the infrared temperature sensor 9 is equal to or lower than the second predetermined temperature (S107). Only when the output of the infrared temperature sensor 9 is equal to or lower than the second predetermined temperature, the vibration sensor 7 detects the boiling. It is determined whether or not (S103). In this determination, when it is determined that the vibration sensor 7 has detected boiling, it is determined whether or not the detected temperature of the infrared temperature sensor 9 is equal to or higher than a predetermined temperature (for example, 80 ° C.) (S104). If it is determined in step S103 that the vibration sensor 7 has not detected boiling, the process returns to step S107.
Next, when it is determined in S104 that the temperature detected by the infrared temperature sensor 9 is equal to or higher than the predetermined temperature, the boiling detection is confirmed and the driving of the energizing coil 1 is stopped (S105). If the temperature detected by the infrared temperature sensor 9 is lower than the predetermined temperature, the boiling detection by the vibration sensor 7 is reset (S106), and the process returns to S107.
[0025]
Here, the second predetermined temperature is set to a temperature higher than the aforementioned predetermined temperature (for example, 80 ° C.). When various kinds of pots are continuously boiled with different amounts of water, the temperature of the top plate 3 approaches the water temperature and the temperature of the pot 6. Set temperature at 100 ° C. Therefore, the detection loop by the vibration sensor 7 is entered only when the temperature detected by the infrared sensor 9 is 100 ° C. or lower. When the boiling detection by the vibration sensor 7 does not operate for some reason, that is, when the temperature exceeds 100 ° C. (S107), the driving of the energizing coil 1 is stopped via the heating control means 4 and the operation / display unit 5 is stopped. To output an error (S108) and stop the operation.
[0026]
As described above, the cooking device according to the present embodiment provides the second predetermined temperature as a limiter of the detection temperature of the infrared temperature sensor 9, so that the vibration sensor 7 causes a detection failure due to the influence of disturbance vibration or the like. Even in this case, the energizing coil 1 can be reliably stopped based on the second predetermined temperature. For this reason, the cooking device safe for the user can be provided. In addition, since error notification is performed when the energizing coil 1 is stopped, it can be used for removing disturbance vibrations and checking the failure of the vibration sensor 7 and improving usability.
[0027]
In the present embodiment, the second predetermined temperature is set to 100 ° C., but is not limited to this value, and may be 95 ° C. or 110 ° C., for example. In addition, when fried food cooking is performed with a heating cooker, the lower surface temperature of the top plate 3 greatly exceeds 100 ° C., and thus when the driving of the energizing coil 1 is stopped at the second predetermined temperature, cooking is interrupted halfway. End up. Therefore, in the present embodiment, it is assumed that the boiling detection process is executed when the user selects the boiling detection function by switch input or the like.
[0028]
Embodiment 3 FIG.
Next, a heating cooker according to Embodiment 3 will be described. FIG. 5 is a cross-sectional view showing the configuration of the heating cooker according to the third embodiment. The third embodiment is different from the first embodiment shown in FIG. 1 in that the operation / display unit 5 is provided with a boiling detection selection switch 5a, and a pair of energization coils instead of the single energization coil 1. They are provided with coils 1a and 1b, and provided with a pair of infrared temperature sensors 9a and 9b instead of a single infrared temperature sensor 9. Other configurations are the same as or equivalent to those of the first embodiment. In addition, the same code | symbol is attached | subjected about the component which is the same as that of Embodiment 1, or equivalent, and the description is abbreviate | omitted.
[0029]
In FIG. 5, a planar top plate 3 is disposed above the pair of energizing coils 1a and 1b, and a pair of heating ports (two ports) are provided in the top plate 3 at a position facing these energizing coils 1a and 1b. Is provided. Moreover, the infrared temperature sensor 9a is arrange | positioned in the center part of the electricity supply coil 1a, and the infrared temperature sensor 9b is arrange | positioned in the center part of the electricity supply coil 1b. Further, a boiling detection selection switch 5 a is provided in the operation / display unit 5. The information of the boiling detection selection switch 5a is output to the boiling detection means 10, and the boiling detection determination is performed only for the boiling detection port desired by the user. Therefore, the boiling detection means 10 and the operation / display unit 5 perform bidirectional information transmission.
[0030]
Next, the operation of the heating cooker according to the present embodiment will be described using the flowchart of FIG. Here, the case where the pan 6 is placed on the right heating port and the right heating port is selected as the boiling detection port by the boiling detection selection switch 5a will be described. At this time, the pan 6 is mounted on the left heating port. It may be placed or may not be placed. That is, it does not matter whether the left energizing coil 1b is energized or not. The processing from S101 to S106 is the same as that in the first embodiment described above, and in this embodiment, S201 to S204 are added.
[0031]
First, by operating the operation / display unit 5 and turning on a start switch (not shown), the energization coil 1a is driven (S101), and the vibration sensor 7 and the infrared temperature sensors 9a and 9b perform detection operations. Start (S102). Here, these infrared temperature sensors 9a and 9b can measure the temperature even when the left and right energizing coils 1a and 1b are inactive.
[0032]
Next, the detection operation is continued until boiling detection is performed by the vibration sensor 7 (S103). When boiling is detected by the vibration sensor 7, it is determined whether or not the detection port (right heating port) is equal to or higher than a predetermined temperature (80 ° C.) (S104). ) Is determined as to whether or not the energizing coil 1b is being driven (S201).
[0033]
When it is determined in S201 that the energizing coil 1b is not driven, it is determined that the detection port side is in a boiling state, and the driving of the energizing coil 1a is stopped (S105). If it is determined in S201 that the energizing coil 1b is being driven, it is determined whether or not the other port (left heating port) is equal to or higher than a predetermined temperature (80 ° C.) (S202). If it is determined by this determination that the temperature of the other port is lower than the predetermined temperature, it is determined that the other port is not in a boiling state, the detection port side is determined to be in a boiling state, and driving of the energizing coil 1a is stopped ( S105).
[0034]
Here, if the other port is equal to or higher than a predetermined temperature (80 ° C.), it cannot be determined which of the detection port (right heating port) and the other port (left heating port) is boiling, and therefore the infrared temperature sensor 9a on the detection port side. Using this signal, boiling detection is performed based on temperature change information (S203). The temperature change information here means that the temperature does not rise to 100 ° C. or higher even when water boils, so the temperature rise amount gradually decreases with the relative value (temperature change) although the temperature of the top plate 3 is delayed in absolute value. It detects the coming phenomenon. Thus, the detection of the boiling of the detection port becomes more accurate by roughly detecting the boiling state. Therefore, it is determined whether or not the boiling has been detected based on the temperature change information (S204). If the boiling is detected, it is determined that the boiling has occurred at the detection port, and the drive of the energization coil 1a at the detection port is stopped (S105). ).
[0035]
If it is determined that the boiling is not detected in the process of S204, the process returns to the boiling detection by the vibration sensor 7 of S103, and the processes of S103 to S204 are repeated until the boiling detection by the temperature change information is confirmed. In this repeating process, for example, it is detected that the other pan 6 is removed and the energization coil 1a is not energized (S201), or the temperature at the other end is lowered to be lower than a predetermined temperature (80 ° C.). In this case (S202), the boiling detection can be confirmed without depending on the temperature change information of the other mouth.
[0036]
As described above, the cooking device according to the present embodiment enables accurate vibration detection by the vibration sensor 7 even when the plurality of energizing coils 1a and 1b are in an energized state, and of course the detection port is a different port. By using this temperature information, it is possible to reliably determine the boiling of only the detection port. At the same time, the vibration source from the disturbance can be canceled, and malfunction can be effectively prevented. Furthermore, since it is not a detection port determination method by temporarily stopping the driving of the left and right energizing coils 1a, 1b, there is no trouble for the user and the usability can be improved.
[0037]
Embodiment 4 FIG.
Next, a heating cooker according to Embodiment 4 will be described. FIG. 7 is a flowchart showing the operation of the heating cooker according to the fourth embodiment. The fourth embodiment is different from the third embodiment in that the processes of S205 and S206 are added to the flowchart of FIG. Therefore, the hardware configuration of the present embodiment is the same as or equivalent to the configuration of the third embodiment shown in FIG. In addition, the same code | symbol is attached | subjected about the component which is the same as that of Embodiment 3, or equivalent, and the description is abbreviate | omitted.
[0038]
First, the energizing coil 1a is driven (S101), and the vibration sensor 7 and the infrared temperature sensor 9a are operated (S102). Next, it is determined whether or not the output of the infrared temperature sensor 9a is equal to or lower than the second predetermined temperature (S205). Only when the output of the infrared temperature sensor 9a is equal to or lower than the second predetermined temperature, the process shifts to S103 and vibrates. The boiling detection operation by the sensor 7 is performed. Here, the second predetermined temperature is set to a temperature higher than the predetermined temperature (80 ° C.) described above. When various kinds of pots are continuously boiled with different amounts of water, the temperature of the top plate 3 approaches the water temperature and the temperature of the pot 6. Set temperature at 100 ° C. Therefore, the detection loop by the vibration sensor 7 is entered only when the temperature detected by the infrared sensor 9a is 100 ° C. or lower. When the boiling detection by the vibration sensor 7 does not operate for some reason, that is, when the temperature exceeds 100 ° C., the drive of the energizing coil 1a is stopped via the heating control means 4, and an error is output by the operation / display unit 5. (S206) and the operation is stopped.
[0039]
As described above, the heating cooker according to the present embodiment has the second predetermined temperature as a limiter for the detected temperatures of the left and right infrared temperature sensors 9a and 9b even when the plurality of energizing coils 1a and 1b are energized. Thus, even when the vibration sensor 7 has a detection failure due to the influence of disturbance vibration or the like, the energizing coil 1 can be reliably stopped based on the second predetermined temperature. For this reason, the cooking device safe for the user can be provided. In addition, since error notification is performed when the energizing coil 1 is stopped, it can be used for removing disturbance vibrations and checking the failure of the vibration sensor 7 and improving usability.
[0040]
Embodiment 5 FIG.
Next, a heating cooker according to Embodiment 5 will be described. FIG. 8 is a cross-sectional view showing the configuration of the heating cooker according to the fifth embodiment. The fifth embodiment is different from the third embodiment shown in FIG. 5 in that the boiling temperature detecting means 10 is provided with a predetermined temperature changing unit 10a. Other configurations are the same as or equivalent to those of the third embodiment. In addition, the same code | symbol is attached | subjected about the component which is the same as that of Embodiment 3, or equivalent, and the description is abbreviate | omitted.
[0041]
As shown in FIG. 8, when the temperature change information includes a descent history at the time of measuring the temperature above the predetermined temperature by the left and right infrared temperature sensors 9a, 9b, The predetermined temperature change part 10a which changes the value of according to each heating port is provided.
[0042]
Next, the operation of the heating cooker according to the present embodiment will be described using the flowchart of FIG. In the operation of the present embodiment, the processes of S207 and S208 are added to the operation of the third embodiment described above. For this reason, the following description is performed mainly on the processes of S207 and S208, and the processes common to the flowchart of FIG. 7 are denoted by the same step numbers and the description thereof is omitted.
[0043]
First, the energizing coil 1a is driven (S101), and the vibration sensor 7 and the infrared temperature sensor 9a are operated (S102). Next, in the predetermined temperature changing unit 11a, the measured temperature at the start of the operation by the infrared temperature sensor 9a is equal to or higher than a predetermined temperature (for example, 80 ° C.), and temperature drop information is included in the temperature information measured from the start of the operation. If the temperature drop information is not included (S207), the process proceeds to the boiling detection operation by the vibration sensor 7 in S103. If temperature drop information is included, the predetermined temperature corresponding to each heating port is changed to a high temperature (for example, 95 ° C.) (S208), and the process proceeds to the boiling detection operation by the vibration sensor 7 in S103. . All the return loops from S103, S106, S203, and S204 also perform the processing of the predetermined temperature changing unit 11a (S207 to S208).
[0044]
Here, the predetermined temperature changing unit 11a is provided with a function of preventing erroneous temperature detection when continuous operation is performed with a heating cooker. That is, when the new pan 6 is placed in a state where the temperature of the top plate 3 is high by the cooking performed so far, the processing by the predetermined temperature changing unit 11a becomes effective. For example, when fried food operation is performed on the energizing coil 1b side of the other mouth and the cooking of the top plate 3 near the other mouth is sufficiently over a predetermined temperature (80 ° C.), Although the temperature of the pan 6 used for cooking is still low, the infrared temperature sensor 9b detects a temperature equal to or higher than a predetermined temperature (80 ° C.). For this reason, it is determined in the process of S202 that “the other port is equal to or higher than the predetermined temperature”, and the process shifts to boiling detection (S203) based on temperature change information on the detection port side.
[0045]
By the way, when the heated pan 6 is removed and the new pan 6 is continuously placed, since the temperature of the new pan 6 is lower than the temperature of the top plate 3, the heat of the top plate 3 is taken away by the new pan 6. However, a temperature drop always occurs in the top plate 3. Therefore, in the predetermined temperature changing unit 11a, when the temperature information measured by the infrared temperature sensors 9a and 9b includes temperature decrease information, it is determined that the operation is continuous, and the predetermined temperature is set to a high temperature (for example, 80 ° C.). To 95 ° C.).
[0046]
As described above, the heating cooker according to the present embodiment sets the predetermined temperature by the predetermined temperature changing unit 11a even when the new pan 6 is placed when the temperature of the top plate 3 is high by continuous operation. Since the temperature is changed to a higher temperature, it becomes possible to prevent erroneous detection of the boiling state in the infrared temperature sensors 9a and 9b, and accurate boiling detection by the vibration sensor 7 and the infrared temperature sensors 9a and 9b can be made possible. .
[0047]
Embodiment 6 FIG.
Next, a heating cooker according to Embodiment 6 will be described. FIG. 10 is a cross-sectional view showing the configuration of the heating cooker according to the sixth embodiment. The sixth embodiment is different from the third embodiment shown in FIG. 5 in that a pair of boiling time prediction units 11a and 11b is provided. Other configurations are the same as or equivalent to those of the third embodiment. In addition, the same code | symbol is attached | subjected about the component which is the same as that of Embodiment 3, or equivalent, and the description is abbreviate | omitted.
[0048]
As shown in FIG. 10, the boiling time prediction units 11a and 11b are provided in the subsequent stages of the infrared temperature sensors 9a and 9b, respectively. And the output of these boiling time estimation parts 11a and 11b is input into the boiling detection means 10, and confirmation of boiling detection is performed based on boiling time prediction information.
[0049]
Next, the processing contents of the left and right boiling time prediction units 11a and 11b will be described with reference to the graph of FIG. Fig.11 (a) is a graph which shows the change of the detected temperature input into the boiling time estimation part 11a from the infrared sensor 9a. Moreover, FIG.11 (b) is a graph which shows the change of the detected temperature input into the boiling time estimation part 11b from the infrared sensor 9b. In this embodiment, the right heating port is a boiling detection port, and the water in the pan 6a placed on the right heating port is less than the water in the pan 6a placed on the left heating port (other port) Is assumed.
[0050]
First, the boiling time prediction unit 11a on the right side stores the measured value at the heating start time tR1, and measures the detected temperature that rises from this point. For example, the change in ΔT / Δt is sequentially measured from the time of measurement of the detected temperature TR1, and the boiling time tR2 reaching the approximate boiling predicted temperature TR2 is predicted. Further, the boiling time prediction unit 11b on the left side stores the measured value at time tL1 when the heating start time from the right heating port is slightly delayed, and measures the detected temperature that rises from this time. Similarly, a change in ΔT / Δt is sequentially measured from the time of measurement of the detected temperature TR1, and a boiling time tL2 that reaches the approximate boiling predicted temperature TL2 is predicted.
[0051]
Since the left heating port has a larger amount of water than the right heating port, the change ΔT / Δt also becomes gentle, and the boiling time prediction predicts a later time tL2. In this way, the boiling time is predicted based on the heating time of the energizing coils 1a and 1b and the temperature change ΔT / Δt, but at least the level at which the boiling time of the right heating port or the left heating port can be detected at the earliest. If it is.
[0052]
Next, the operation of the heating cooker according to Embodiment 6 will be described using the flowchart of FIG. First, the energizing coil 1a is driven (S101), and the vibration sensor 7 and the infrared temperature sensor 9a are operated (S102). Also, the left and right boiling time prediction units 11a and 11b are started (S301).
[0053]
Next, a case where only the detection port (right heating port) is heated will be described. Immediately after the start of the boiling time prediction units 11a and 11b in S301, it is determined whether or not the energization coil 1b of the other port (left heating port) is driven (S302), but only the detection port is heated. It is determined that the coil 1b is not driven. Based on this determination, the output of the vibration sensor 7 is then measured to determine whether or not a boiling detection signal is output (S303). In this process, when it is determined that the boiling detection signal is not output, the process returns to S301, and the processes of S301->S302-> S303 are repeated until the boiling detection signal is output from the vibration sensor 7.
[0054]
If it is determined in step S303 that the boiling detection signal is output, the boiling at the detection port is confirmed and the drive of the energization coil 1a at the detection port is stopped (S304). In this example, since the other port is not operating, the boiling time prediction signal is not used. However, when the boiling time is largely different from the boiling time prediction when the boiling is confirmed, the boiling detection by the vibration sensor 7 is performed again. Also good.
[0055]
Next, the case where the energizing coil 1b at the other port (left detection port) is driven slightly behind the energizing coil 1a at the detection port as described in FIG. 11 will be described. First, immediately after the start of the boiling time prediction units 11a and 11b in S301, it is determined whether or not the energizing coil 1b of the other port (left heating port) is driven (S302), but the other port is also heated. It is determined that the energization coil 1b is driven. Based on this determination, it is next determined whether or not a boiling detection signal is output from the vibration sensor 7 (S305). In this process, if it is determined that the boiling detection signal is not output, the process returns to S301, and the processes of S301->S302-> S305 are repeated until the boiling detection signal is output from the vibration sensor 7. .
[0056]
When it is determined that the boiling detection signal is output in the process of S305, it is determined whether “1” is set in the other mouth detected flag (S306). The other mouth detected flag is a flag that is cleared to zero when the boiling of the other mouth is confirmed. However, since the boiling of the other mouth is not confirmed at this time, “1” is displayed in the other mouth detected flag. Is standing. For this reason, in S306, it is determined that the other mouth detected flag is set to “1”, and the process proceeds to S307. In S307, with reference to the result of boiling time prediction by the left and right boiling time prediction units 11a and 11b, it is determined which heating port first reaches the boiling time (S307). In the example of FIG. 11, since it is determined that the detection port (right heating port) has an earlier boiling time, the process proceeds to S304. In S304, boiling of the detection port is confirmed, driving of the energization coil 1a of the detection port is stopped, and the boiling detection routine is ended. In this case, the other port continues to be heated.
[0057]
Next, the case where the energization coil 1b of the other port (left heating port) is driven and the boiling time of the other port is predicted to be earlier by the boiling time prediction in the left and right boiling time prediction units 11a and 11b will be described. To do. First, immediately after the start of the boiling time prediction units 11a and 11b in S301, it is determined whether or not the energizing coil 1b of the other port (left heating port) is driven (S302), but the other port is also heated. It is determined that the energization coil 1b is driven. Based on this determination, it is next determined whether or not a boiling detection signal is output from the vibration sensor 7 (S305). In this process, when it is determined that the boiling detection signal is not output, the process returns to S301, and the processes of S301->S302-> S305 are repeated until the boiling detection signal is output from the vibration sensor 7.
[0058]
When it is determined that the boiling detection signal is output in the process of S305, it is determined whether “1” is set in the other mouth detected flag (S306). At this time, since the boiling of the other mouth has not been determined, the flag is set to “1”. For this reason, in S306, it is determined that the other mouth detected flag is set to “1”, and the process proceeds to S307. In S307, with reference to the result of boiling time prediction by the left and right boiling time prediction units 11a and 11b, it is determined which heating port first reaches the boiling time (S307). In this example, since it is determined that the boiling time of the other port (left heating port) is earlier, the process proceeds to S308. In S308, the boiling of the other port (left heating port) is confirmed, the other port detected flag is cleared to zero, the boiling detection signal is reset, and the process returns to S301.
[0059]
Thereafter, the processing is continued from S301. However, since the boiling detection mode is not selected for the other port, the driving of the energizing coil 1b for the other port is not stopped, and the process proceeds to S305 according to the determination in S302. Here, when the detection port (right heating port) where boiling is predicted to occur with a delay is boiled, the output change of the vibration sensor 7 increases, and a boiling detection signal is output from the vibration sensor 7. For this reason, in S305, it determines with the boiling detection signal being output from the vibration sensor 7, and a process transfers to S306. In S306, it is determined whether or not the other mouth detected flag is set to “1”. Since the other mouth detected flag is already cleared to zero in S308, the process proceeds to S304. In S304, boiling of the detection port is confirmed, driving of the energization coil 1a of the detection port is stopped, and the boiling detection routine is ended. Even in this case, the other port continues to be heated.
[0060]
As described above, the cooking device according to this embodiment enables accurate vibration detection by the vibration sensor 7 even when the plurality of energizing coils 1a and 1b are energized, and the right and left boiling time predicting units. With 11a and 11b, it is possible to reliably determine the boiling of the detection port as well as the other port. At the same time, the vibration source from disturbance can be canceled, and malfunction can be prevented. Furthermore, since it is not a detection port determination method by temporarily stopping the driving of the left and right energizing coils 1a and 1b, the user does not feel any trouble and can improve usability.
[0061]
In this embodiment, the energization coil 1b is processed in the conductive state even after the boiling detection of the other port (left heating port) is confirmed. However, when the boiling detection mode is selected for the other port (left heating port) as well. Can stop the drive of the energizing coil 1b. It is also possible to confirm boiling by confirming whether or not the temperature is equal to or higher than the predetermined temperature described in the third embodiment before the boiling detection is confirmed. In this case, the accuracy of boiling detection can be further improved.
[0062]
Embodiment 7 FIG.
Next, a heating cooker according to Embodiment 7 will be described. FIG. 13 is a flowchart showing the operation of the heating cooker according to the seventh embodiment. The seventh embodiment is different from the third embodiment in that the processes of S401, S402, and S403 are added to the flowchart of FIG. Therefore, the hardware configuration of the present embodiment is the same as or equivalent to the configuration of the third embodiment shown in FIG. In addition, the same code | symbol is attached | subjected about the component which is the same as that of Embodiment 3, or equivalent, and the description is abbreviate | omitted.
[0063]
First, the energizing coil 1a is driven (S101), and the vibration sensor 7 and the infrared temperature sensor 9a are operated (S102). Next, the detection operation is continued until boiling detection is performed by the vibration sensor 7 (S103). When boiling is detected by the vibration sensor 7, it is determined whether or not the temperature detected by the infrared temperature sensor 9 is equal to or higher than a predetermined temperature (80 ° C.) (S104). ) Is determined as to whether or not the energizing coil 1b is being driven (S201). If the temperature detected by the infrared temperature sensor 9 is lower than the predetermined temperature, the boiling detection by the vibration sensor 7 is reset (S106), and the process returns to S103.
[0064]
If it is determined in S201 that the energizing coil 1b is being driven, it is determined whether the other port (left heating port) is equal to or higher than a predetermined temperature (80 ° C.) (S202). If it is determined by this determination that the temperature of the other port is lower than the predetermined temperature, it is determined that the other port is not in a boiling state, the detection port side is determined to be in a boiling state, and driving of the energizing coil 1a is stopped ( S105).
[0065]
If it is determined in S201 that the energizing coil 1b is not driven, boiling at the detection port is confirmed and driving of the energizing coil 1a in the detection port is stopped (S401). Next, it is determined whether or not the vibration intensity of the detection signal of the vibration sensor 7 continues (S402). If the vibration intensity continues, it is determined that the vibration sensor 7 has detected vibration due to disturbance. Then, the driving of the energization coil 1a at the detection port is resumed (S403). After that, the sensing means is switched to boiling detection using temperature change information of the infrared temperature sensor 9a on the detection port side (S203).
[0066]
Then, it is determined whether or not boiling has been detected by the infrared temperature sensor 9a (S204). If boiling is detected, it is determined that the boiling has occurred at the detection port, and the drive of the energization coil 1a at the detection port is stopped (S105). ). If it is determined that the boiling is not detected in the process of S204, the process returns to the boiling detection by the vibration sensor 7 of S103, and the processes of S103 to S204 are repeated until the boiling detection by the temperature change information is confirmed.
[0067]
As described above, after the boiling detection is performed by the vibration sensor 7, the driving of the energizing coil 1a is temporarily stopped, and it is determined whether or not the vibration intensity at the vibration sensor 7 is stopped in accordance with the stop. Vibration is detected. While the vibration due to the disturbance is occurring, the vibration sensor 7 cannot accurately detect the boiling, and therefore the sensing means is switched from the vibration sensor 7 to the infrared temperature sensor 9a to detect the boiling. As a result, the boiling of the pan 6 can be reliably detected without being influenced by vibration due to disturbance.
[0068]
Embodiment 8 FIG.
Next, a heating cooker according to Embodiment 8 will be described. FIG. 14 is a flowchart showing the operation of the heating cooker according to the eighth embodiment. The eighth embodiment differs from the third embodiment in that the processes of S401, S402, and S403 are added to the flowchart of FIG. 6 and the process of S202 is deleted. Therefore, the hardware configuration of the present embodiment is the same as or equivalent to the configuration of the third embodiment shown in FIG. In addition, the same code | symbol is attached | subjected about the component which is the same as that of Embodiment 3, or equivalent, and the description is abbreviate | omitted.
[0069]
First, the energizing coil 1a is driven (S101), and the vibration sensor 7 and the infrared temperature sensor 9a are operated (S102). Next, the detection operation is continued until boiling detection is performed by the vibration sensor 7 (S103). When boiling is detected by the vibration sensor 7, it is determined whether or not the temperature detected by the infrared temperature sensor 9 is equal to or higher than a predetermined temperature (80 ° C.) (S104). ) Is determined as to whether or not the energizing coil 1b is being driven (S201). If the temperature detected by the infrared temperature sensor 9 is lower than the predetermined temperature, the boiling detection by the vibration sensor 7 is reset (S106), and the process returns to S103.
[0070]
If it is determined in S201 that the energizing coil 1b is being driven, the sensing means is switched to boiling detection using temperature change information of the infrared temperature sensor 9a on the detection port side (S203).
[0071]
If it is determined in S201 that the energizing coil 1b is not driven, boiling at the detection port is confirmed and driving of the energizing coil 1a in the detection port is stopped (S401). Next, it is determined whether or not the vibration intensity of the detection signal of the vibration sensor 7 continues (S402). If the vibration intensity continues, it is determined that the vibration sensor 7 has detected vibration due to disturbance. Then, the driving of the energization coil 1a at the detection port is resumed (S403). After that, the sensing means is switched to boiling detection using temperature change information of the infrared temperature sensor 9a on the detection port side (S203).
[0072]
Then, it is determined whether or not boiling has been detected by the infrared temperature sensor 9a (S204). If boiling is detected, it is determined that the boiling has occurred at the detection port, and the drive of the energization coil 1a at the detection port is stopped (S105). ). If it is determined that the boiling is not detected in the process of S204, the process returns to the boiling detection by the vibration sensor 7 of S103, and the processes of S103 to S204 are repeated until the boiling detection by the temperature change information is confirmed.
[0073]
As described above, after the boiling detection is performed by the vibration sensor 7, the driving of the energizing coil 1a is temporarily stopped, and it is determined whether or not the vibration intensity at the vibration sensor 7 is stopped in accordance with the stop. Vibration is detected. While the vibration due to the disturbance is occurring, the vibration sensor 7 cannot accurately detect the boiling, and therefore the sensing means is switched from the vibration sensor 7 to the infrared temperature sensor 9a to detect the boiling. As a result, the boiling of the pan 6 can be reliably detected without being influenced by vibration due to disturbance.
【The invention's effect】
The cooking device according to the present invention detects that the object to be heated in the heating container is in a boiling state based on the output of the vibration sensor, and on the condition that the detected temperature of the temperature sensor is equal to or higher than a predetermined temperature. By providing the boiling detection means for determining the boiling detection of the object to be heated, it is possible to detect which heating port is boiling without temporarily stopping the energizing coil. As a result, it is possible for the user to improve usability with no sense of malfunction.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a heating cooker according to a first embodiment.
FIG. 2 is a graph showing an output of a vibration sensor accompanying boiling and a smoothing processing waveform of the output.
FIG. 3 is a flowchart showing the operation of the heating cooker according to the first embodiment.
FIG. 4 is a flowchart showing the operation of the heating cooker according to the second embodiment.
FIG. 5 is a cross-sectional view showing a configuration of a heating cooker according to a third embodiment.
FIG. 6 is a flowchart showing the operation of the heating cooker according to the third embodiment.
FIG. 7 is a flowchart showing the operation of the heating cooker according to the fourth embodiment.
FIG. 8 is a cross-sectional view showing a configuration of a heating cooker according to a fifth embodiment.
FIG. 9 is a flowchart showing the operation of the heating cooker according to the fifth embodiment.
FIG. 10 is a cross-sectional view showing a configuration of a heating cooker according to a sixth embodiment.
FIG. 11 is a graph showing an example of temperature change related to boiling time prediction of the heating cooker according to the sixth embodiment.
FIG. 12 is a flowchart showing the operation of the heating cooker according to the sixth embodiment.
FIG. 13 is a flowchart showing the operation of the heating cooker according to the seventh embodiment.
FIG. 14 is a flowchart showing the operation of the heating cooker according to the eighth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Current supply coil, 1a, 1b ... Current supply coil, 2 ... Housing, 3 ... Top plate, 4 ... Heating control means, 5 ... Operation / display part, 5a ... Boiling detection selection switch, 6 ... Pan, 7 ... Vibration sensor 8 ... signal smoothing means, 9 ... infrared temperature sensor, 9a, 9b ... infrared temperature sensor, 10 ... boiling detection means, 10a ... predetermined temperature changing section, 11a, 11b ... boiling time prediction section.

Claims (9)

A heating cooker body provided with a top plate for placing the heating container on the top;
Heating means for cooking the object to be heated in the heating container;
A vibration sensor for detecting a vibration level transmitted to the heating cooker body;
A temperature sensor for detecting the temperature of the heating container or the temperature of the top plate in contact with the heating container;
Based on the output of the vibration sensor, it is detected that the object to be heated in the heating container is in a boiling state, and the boiling detection of the object to be heated is performed on the condition that the temperature detected by the temperature sensor is equal to or higher than a predetermined temperature. A cooking device comprising a boiling detection means for determining the temperature. 2. The cooking device according to claim 1, wherein the boiling detection unit determines that a detection error has occurred when a temperature detected by the temperature sensor exceeds a second predetermined temperature higher than the predetermined temperature. A boiling detection switch capable of selecting boiling detection; and a notification means for performing error notification;
When boiling detection is selected by the boiling detection switch and a detection error is determined by the boiling detection means, heating is interrupted by the heating control means, or error notification is performed by the notification means. The cooking device according to claim 2. A heating cooker body provided with a top plate having a plurality of heating ports for placing a heating container on the top;
A plurality of heating means provided for each of the heating ports, for cooking the object to be heated in the heating container;
A vibration sensor for detecting a vibration level transmitted to the heating cooker body;
A plurality of temperature sensors that are provided for each heating port and detect the temperature of the heating container or the temperature of the heating port;
A boiling detection switch capable of selecting boiling detection for each heating port;
Based on the output of the vibration sensor, it is detected that the object to be heated in the heating container is in a boiling state, and the temperature detected by the temperature sensor of the heating port selected for boiling detection by the boiling detection switch is a predetermined temperature. A cooking device comprising: boiling detection means for determining boiling detection of an object to be heated on condition that it is as described above. The boiling detection means detects boiling of an object to be heated on condition that the temperature detected by the temperature sensor at the other port which is the heating port for which boiling detection is not selected by the boiling detection switch is lower than the predetermined temperature. 5. The boiling detection of an object to be heated is confirmed using temperature change information of the temperature sensor when the temperature detected by the temperature sensor at the other port is equal to or higher than the predetermined temperature. Cooker. The boiling detection means is configured to detect the vibration sensor when a temperature detected by the temperature sensor of the detection port which is the heating port selected for boiling detection by the boiling detection switch is within a second predetermined temperature higher than the predetermined temperature. The heating control means when detecting that the object to be heated in the heating container is in a boiling state based on the output of the heating container, and when the temperature detected by the temperature sensor at the detection port exceeds the second predetermined temperature. The heating cooker according to claim 4 or 5, wherein the heating is cut off or an error is notified by the notification means. When the temperature sensor measures the temperature equal to or higher than the predetermined temperature, the temperature change information further includes a predetermined temperature changing unit that changes the value of the predetermined temperature if a drop history is included. The cooking device according to any one of claims 4 to 6. A heating cooker body provided with a top plate having a plurality of heating ports for placing a heating container on the top;
A plurality of heating means provided for each of the heating ports, for cooking the object to be heated in the heating container;
A vibration sensor for detecting a vibration level transmitted to the heating cooker body;
A plurality of temperature sensors that are provided for each heating port and detect the temperature of the heating container or the heating port;
A boiling time prediction unit that predicts a heating port that boils earlier from the temperature change information of each temperature sensor;
When it is detected that the object to be heated in the heating container is in a boiling state based on the output of the vibration sensor, the boiling for determining which boiling outlet is detected in the heating port based on the prediction result of the boiling time prediction unit A heating cooker comprising a detecting means. A heating cooker body provided with a top plate for placing the heating container on the top;
Heating means for cooking the object to be heated in the heating container;
A vibration sensor for detecting a vibration level transmitted to the heating cooker body;
A temperature sensor for detecting the temperature of the heating container or the temperature of the top plate in contact with the heating container;
Perform boiling measurement by the vibration sensor, and when the heated object in the heating container is detected to be in a boiling state based on the output of the vibration sensor, stop heating or reduce the heating amount of the heating means, When the output of the vibration sensor does not decrease, the cooking device further comprises boiling detection means for switching to boiling measurement by the temperature sensor.

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