KR100761629B1 - A heating appliance for cooking - Google Patents

Abstract

A heating appliance for cooking is provided to reduce the time until starting heating a heating device when a cooking load is inputted and a temperature is decreased. A heating appliance for cooking includes more than two temperature sensors(4,5), a heating device(6), and a controlling device(8). The temperature sensors(4,5) are installed at the lower surface of a top plate(3) on which a cooking vessel(1) is located. The heating device(6) is installed at the lower surface of the top plate(3), and heats the cooking vessel(1). The controlling device(8) controls the heating device(6) based on information about temperature of the temperature sensors(4,5). The controlling device(8) performs the control regarding the maximum temperature based on the information of temperature of the temperature sensor(4,5) which detects the highest temperature among more than two temperature sensors(4,5), and performs the control regarding the minimum temperature based on the temperature information of the temperature sensor(4,5) which detects the lowest temperature among more than two temperature sensors(4,5).

Description

A heating appliance for cooking

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram of the heating cooker in Embodiment 1 of this invention.

2 is a layout view of a temperature sensor in Embodiment 1 of the present invention.

Fig. 3 is a flowchart showing the operation in the first embodiment of the present invention.

4 is a diagram showing temperature control in Embodiment 1 of the present invention.

5 is a layout view of a temperature sensor in Embodiment 2 of the present invention;

6 is a layout view of a temperature sensor in Embodiment 3 of the present invention;

(Explanation of symbols for the main parts of the drawing)

1: cooking container 2: oil

3: top plate 4: first temperature sensor

5: second temperature sensor 6: heating coil

7: temperature detection means 8: control means

9: inverter circuit

The present invention relates to a heating cooker, and more particularly, to control using a plurality of temperature sensors.

Conventional heating cookers are, for example, ". First temperature control means for comparing the detected temperature of the first temperature detection element with the set temperature input value and outputting the first output control signal based on the comparison result, and the detected temperature and the set temperature input of the second temperature detection element. The second temperature control means for comparing the values and outputting the second output control signal based on the result of the comparison, and inputting the first output control signal and the second output control signal and performing calculations based on the first and second induction heating coils. A coil current control means for controlling the energizing current of the coil and controlling the output of the coil. It is proposed (for example, refer patent document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 4-2092 (claim 2)

In a conventional heating cooker, two temperature sensors are provided, and if the detected temperature of the first and second temperature sensors is low, the output of IH heating is turned on, and if both are high, temperature control by turning off the output, Or in the preheating process of heating the oil in a cooking container to predetermined temperature, it is temperature-controlled by the detection temperature of a 1st temperature sensor, and it is the detection temperature of a 2nd temperature sensor in the heat retention process which keeps a temperature constant. Temperature control is performed.

However, when the cooking load or the like is input and the oil temperature is lowered, the detection temperature of both the temperature sensors is lowered and the IH heating is not turned on until the predetermined value is reached. Therefore, the reaction time of the sensor becomes long. There is this.

In addition, when temperature control is performed by the detection temperature of a 1st temperature sensor in a preheating process, and temperature control is performed by the detection temperature of a 2nd temperature sensor in a heat retention process, the temperature of a 1st temperature sensor is lowered at the time of a heat retention process first. Even if temperature is detected, there is a problem that the IH heating is not turned ON, and as a result, the reaction time of the sensor becomes long.

The present invention has been made to solve the above problems, and in the temperature control by a plurality of temperature sensors, when the cooking load or the like is input and the temperature is reduced, the sensor reaction time until the IH heating is turned on can be shortened. Is to get a heated cooker.

(Means to solve the task)

In the heating cooker which concerns on this invention, the at least 2 or more temperature sensor provided in the lower surface side of the top plate which mounts a cooking container, the heating means provided in the lower surface side of the said top plate, and a heating means for heating the said cooking container, and the said two or more A control means for controlling the heating means based on temperature information of a temperature sensor,

The said control means controls based on the temperature information of the temperature sensor which detected the highest temperature among the said two or more temperature sensors at the time of performing control regarding an upper limit temperature, and said 2 or more when performing control regarding a lower limit temperature Control is performed based on the temperature information of the temperature sensor which detected the lowest temperature among the temperature sensors.

Embodiment 1

EMBODIMENT OF THE INVENTION Hereinafter, Embodiment 1 of this invention is demonstrated based on FIG.

1 is a block diagram of a heating cooker according to the first embodiment of the present invention, and FIG. 2 is a layout view of the temperature sensor according to the first embodiment of the present invention. In FIG. 1, the heating cooker is a first plate attached to the top plate 3 on which the cooking vessel 1 containing the oil 2, etc., to be heated, is placed in the cooking vessel 1, and a lower surface of the top plate 3. Heating, which is provided on the lower surface side of the temperature sensor 4, the second temperature sensor 5, and the top plate 3, and performs heating by induction heating (hereinafter referred to as IH heating) by supplying a high frequency current. The temperature information output from the temperature detecting means 7 and the temperature detecting means 7 into which the temperature information detected by the coil 6, the first temperature sensor 4, and the second temperature sensor 5 are inputted. The control means 8 which inputs and performs below-mentioned, and performs the preheating process which raises the temperature of the oil 2 to a predetermined preheating temperature, and the heat retention process which maintains the temperature of the oil 2 at predetermined | prescribed heat retention temperature. The inverter circuit 9 supplies a high frequency current to the heating coil 6 by the control of the control means 8. It can control.

2 has shown the figure which looked at the heating coil 6, the 1st temperature sensor 4, and the 2nd temperature sensor 5 from the planar upper surface, Comprising: The 1st temperature sensor 4 and The 2nd temperature sensor 5 is arrange | positioned at the position which is the same distance a from the center on a straight line. The distance a is 30 mm, for example.

In addition, when the bottom of the cooking vessel 1 is not flat and there is a gap between the cooking vessel 1 and the top plate 3, the first temperature sensor 4 and the second temperature sensor 5 When a difference occurs in the detection temperature of Nm, for example, there is a gap of 2 mm, the temperature difference is 20 ° C to 30 ° C.

The operation of the present embodiment having such a configuration will be described next with reference to FIGS. 3 and 4.

3 is a flowchart showing an operation in the first embodiment of the present invention, and FIG. 4 is a diagram showing the temperature control in the first embodiment of the present invention. 4 shows the detection temperature of the temperature sensor detecting Hi-Th and Lo-Th, which will be described later, and the ON-OFF timing of the IH heating output.

First, the user who operates a heating cooker puts the cooking container 1 into which the oil 2 was put in the predetermined position on the top plate 3, and turns on the frying start key which is a cooking menu on the control panel which is not shown in figure. (S1). The control means 8 drives the inverter circuit 9 and turns on IH heating by flowing a high frequency current through the heating coil 6 (S2). In this embodiment, IH heating of 1 kW is performed, for example.

Next, as for the control means 8, the sensor temperature (henceforth Hi-Th) of the 1st temperature sensor 4 or the 2nd temperature sensor 5 which is detecting a high temperature, It is determined whether or not the predetermined preheating end temperature is higher (S3). Here, preheating end temperature is 1st preheating end temperature (henceforth Hi-Th preheating end temperature) as an upper limit temperature, and 2nd preheating end temperature whose temperature is lower than Hi-Th preheating end temperature as a lower limit temperature. (Hereinafter referred to as Lo-Th preheating end temperature) are pre-programmed in a single-chip microcomputer (not shown) in the control means 8, respectively. For example, if the oil temperature set temperature is 180 ° C, the Hi-Th preheating end temperature is set to 190 ° C, and the Lo-Th preheating end temperature is set to 170 ° C.

In step S3, when it is less than Hi-Th preheating end temperature, IH heating is continued continuously and when it becomes more than Hi-Th preheating end temperature, IH heating is turned off (S4).

Next, in the first temperature sensor 4 or the second temperature sensor 5, is the sensor temperature (hereinafter referred to as Lo-Th) on the side detecting the low temperature equal to or higher than the Lo-Th preheating end temperature? It is determined whether or not (S5). If it is less than the Lo-Th preheating end temperature, it is determined whether Lo-Th has gone from rising to falling (S6). That is, although IH heating is turned off in step S4, since it takes time until Lo-Th goes from rising to falling by the overshoot, the IH heating is turned off therebetween. When Lo-Th becomes rising from falling in step S6, Lo-Th at that time is stored as temperature A (S7), and IH heating is turned ON again (S8).

Next, as in step S5, it is judged whether or not Lo-Th is equal to or higher than the Lo-Th preheating end temperature (S9), and when it is less than the Lo-Th preheating end temperature, the temperature (A) stored by Lo-Th is stored. It is determined whether or not the temperature is equal to or higher than a predetermined value (for example, A + 10 ° C.) (S11). In addition, although the predetermined value was 10 degreeC here, it is not limited to this and may be another temperature, for example, 5 degreeC. When Lo-Th becomes A + 10 degreeC or more in step S11, IH heating is turned off (S12), and it is judged again whether Lo-Th is more than Lo-Th preheating end temperature (S5).

On the other hand, if Lo-Th is equal to or higher than the Lo-Th preheating end temperature in step S5, it is determined whether Lo-Th is lower than the Lo-Th preheating end temperature (S13). The buzzer is notified (S14), and the preheating process is terminated. If Lo-Th is equal to or higher than the Lo-Th preheating end temperature in step S9, IH heating is turned off (S10), and determination of the end of the preheating step is made in step S13. That is, when Lo-Th is judged to be more than Lo-Th preheating end temperature in sequence S5 or S9, and it becomes below Lo-Th preheating end temperature after that, a preheating process is complete | finished.

By this operation, in the preheating step, when the temperature of the temperature sensor detecting Hi-Th is equal to or higher than the Hi-Th preheating end temperature, the temperature of the oil 2 in which the IH heating is turned off does not increase abnormally. The heating can be turned off quickly. In addition, since it determines whether Lo-Th goes from rising to falling and controls IH heating, it can preheat without the temperature of oil 2 raising abnormally by overshoot.

After the preheating step is completed, the control means 8 subsequently performs a heat retaining step of keeping the temperature of the oil 2 constant (S15).

The control means 8 judges whether Lo-Th is below the heat retention control temperature (S16), and turns on IH heating when Lo-Th is below the heat retention control temperature (S17). For example, heating up to 1.5 kW IH. Here, the heat insulation control temperature and the upper limit temperature of Hi-Th which are mentioned later are previously programmed in the one-chip microcomputer not shown in the control means 8, For example, the heat insulation control temperature is 170 degreeC, and Hi-Th of An upper limit temperature is set to 230 degreeC.

Next, it is determined whether or not Hi-Th is at or above the upper limit temperature (S18). When it is at or above the upper limit temperature, the IH heating is turned off (S20), and again, Lo-Th is lower than the thermal control temperature. It is determined whether (S16). In addition, when Hi-Th is less than an upper limit temperature in step S18, it is judged whether Lo-Th became more than heat retention control temperature (S19), and when it is more than heat retention control temperature, IH heating is turned OFF in step S20. The above steps S16 to S20 elapse a predetermined time (for example, 45 minutes) until the frying stop key on the control panel (not shown) is turned on, until the power of the heating cooker is turned off, or without changing the set temperature. Repeat until the frying stops automatically.

By such an operation, in the warming step, the IH heating is repeatedly turned on and off, while maintaining the temperature of the oil 2 at a predetermined warming control temperature, while a cooking load is applied and the temperature of the oil 2 is lowered. At this time, the IH heating is turned on again on the basis of the temperature information of the temperature sensor detecting Lo-Th, so that the operation time until reheating can be shortened.

When the I-H heating is turned ON, the heating is turned off when the Hi-Th is higher than the upper limit temperature even when the Lo-Th does not become above the thermal control temperature and the IH heating continues and the temperature of the oil 2 rises. Heating can be turned off quickly without the temperature of 2) rising abnormally.

In addition, although Lo-Th preheating end temperature and heat insulation control temperature shown in FIG. 4 are the same temperature, respectively, it is set as different temperature, for example, Lo-Th preheating end temperature = 170 degreeC, heat insulation control temperature = 168 degreeC. Also good.

In addition, although the output of IH heating was 1 kW in preheating process and 1.5 kW maximum in a heat retention process, heating power value is not limited to this and may be another value.

As described above, in the first embodiment, in the preheating step, when the temperature of the temperature sensor that detects the highest temperature becomes higher than the predetermined preheating end temperature, the IH heating is turned off, whereby the temperature of the oil 2 is dangerous. IH heating can be turned off before this.

Moreover, in a heat retention process, cooking load is thrown in and oil (2) is made by performing control which turns on / off IH heating so that it may be maintained at predetermined | prescribed heat insulation control temperature based on the temperature of the temperature sensor which detected the lowest temperature. When the temperature of) decreases, the sensor reaction time until the IH heating is turned on again can be shortened. Moreover, when the temperature of the temperature sensor which detected the highest temperature is more than a predetermined upper limit temperature, control can be made to turn off IH heating, and heating can be turned off before the oil 2 temperature becomes high temperature. .

In addition, in the preheating step, since the temperature of the temperature sensor that detects the lowest temperature is judged from rising to falling and controlling the IH heating, the temperature of the oil 2 can be preheated without abnormally rising by the overshoot. Can be.

Embodiment 2

5 is a layout view of a temperature sensor in Embodiment 2 of the present invention. FIG. 5 shows a view of the heating coil 6, the first temperature sensor 4, and the second temperature sensor 5 as viewed from the top of the plane, and the first temperature sensor 4, the second The arrangement of the temperature sensors 5 is arranged at a position away from the center by the same distance (a) at positions which are not in a straight line. The arrangement angles of the first temperature sensor 4 and the second temperature sensor 5 are 135 degrees, for example, and the distance a is 30 mm, for example. Other configurations and operations are the same as those in the first embodiment.

With such a configuration, in addition to the effects of the first embodiment, in the second embodiment, the first temperature sensor 4 and the second temperature sensor 5 are asymmetrically disposed with respect to the center of the heating coil 6. By doing so, an imbalance in the temperature distribution of the heated oil 2 can be detected.

Embodiment 3

6 is a layout view of a temperature sensor in Embodiment 3 of the present invention. FIG. 6 shows a view of the heating coil 6, the first temperature sensor 4, and the second temperature sensor 5 as viewed from the top of the plane, and the first temperature sensor 4, the second Arrangement | positioning of the temperature sensor 5 is arrange | positioned in the position which differs from the center at the distance (a) and distance (b) from a straight line. The distance a is 30 mm, for example, and the distance b is 50 mm, for example. Other configurations and operations are the same as those in the first embodiment.

By such a configuration, in addition to the effect of the first embodiment, in the third embodiment, the first temperature sensor 4 and the second temperature sensor 5 are arranged asymmetrically with respect to the center of the heating coil 6. By doing so, an imbalance in the temperature distribution of the heated oil 2 can be detected.

In addition, although the case where the temperature detection by two temperature sensors was demonstrated in said Embodiment 1-3, this invention is not limited to this, You may use three or more temperature sensors. At this time, the same effect is performed by controlling the temperature of the temperature sensor which detected the highest temperature among the three or more temperature sensors as Hi-Th, and controlling the temperature of the temperature sensor which detected the lowest temperature as Lo-Th. Needless to say.

In addition, the installation position of each temperature sensor is not limited to the installation position in the said Embodiment 1-3, You may install in arbitrary positions.

This invention controls based on the temperature information of the temperature sensor which detected the highest temperature among the said 2 or more temperature sensors at the time of the control regarding an upper limit temperature, and said 2 or more temperature when performing control regarding a lower limit temperature By controlling based on the temperature information of the temperature sensor which detected the lowest temperature among the sensors, when the cooking load or the like is put in and the temperature is lowered, it is possible to shorten the time until the heating means starts heating.

Claims (7)

At least two or more temperature sensors provided on the lower surface side of the top plate on which the cooking vessel is placed; Heating means which is provided in the lower surface side of the said top plate, and heats the said cooking container, Control means for controlling said heating means based on temperature information of said at least two temperature sensors, The control means, When performing control regarding an upper limit temperature, it controls based on the temperature information of the temperature sensor which detected the highest temperature among the said two or more temperature sensors, When performing control regarding a minimum temperature, it controls based on the temperature information of the temperature sensor which detected the lowest temperature among the said two or more temperature sensors. The method of claim 1, The control means includes a cooking menu having at least a preheating step of raising the temperature of the heated object put into the cooking vessel to a predetermined preheating temperature, and a warming step of maintaining the temperature of the heated object at a predetermined warming temperature, In the preheating step, at least control regarding the upper limit temperature is performed, In the said heat retention process, the control regarding the said upper limit temperature and the control regarding the said minimum temperature are performed, The heating cooker characterized by the above-mentioned. The method of claim 2, The control means, in the preheating step, The heating cooker which stops heating of the said control means, when the temperature of the temperature sensor which detected the highest temperature among the said 2 or more temperature sensors is more than the predetermined preheating end temperature set as the said upper limit temperature. The method of claim 2, The control means, in the preheating step, The heating of the said heating means is stopped when the temperature of the temperature sensor which detected the highest temperature among the said two or more temperature sensors became more than predetermined 1st preheating end temperature set as the said upper limit temperature, After the temperature of the temperature sensor which detected the lowest temperature among the said 2 or more temperature sensors becomes lower than the said 1st preheating end temperature, and becomes more than the 2nd preheating end temperature set as the said minimum temperature, the said 2nd preheating The said preheating process is complete | finished when it becomes below finishing temperature, The heating cooker characterized by the above-mentioned. The method of claim 4, wherein The control means, in the preheating step, When the temperature of the temperature sensor which detected the highest temperature becomes more than the said 1st preheating end temperature, and when the temperature of the temperature sensor which detected the said lowest temperature is less than the said 2nd preheating end temperature, the said To stop heating of the heating means, When the temperature of the temperature sensor that detected the lowest temperature drops, heating of the heating means is started until the temperature of the temperature sensor that detects the lowest temperature rises to a predetermined value. Heated cooker. The method according to any one of claims 2 to 5, The control means, in the thermal insulation step, When the temperature of the temperature sensor which detected the highest temperature among the two or more temperature sensors is more than the predetermined temperature set as the said upper limit temperature, heating of the said control means is stopped, When the temperature of the temperature sensor which detected the lowest temperature among the said 2 or more temperature sensors is less than the predetermined heat insulation control temperature set as the said minimum temperature, heating of the said control means is started, The heating cooker which stops heating of the said control means, when the temperature of the temperature sensor which detected the lowest temperature among the said two or more temperature sensors is more than the said heat insulation control temperature. The method according to any one of claims 1 to 5, The heating means includes an induction heating coil provided on the lower surface side of the top plate, And an inverter for supplying a high frequency current to the induction heating coil.

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