KR0161090B1 - Automatic cooking method of microwave oven - Google Patents

Abstract

The present invention relates to a grill microwave oven, and in particular, to detect the thermal components of the steam generated during the ambient temperature detection and cooking at the same time to use the configuration of the sensing unit as well as to increase the efficiency of the continuous cooking of the grill microwave oven It relates to an automatic cooking apparatus and a method thereof.

The present invention detects the temperature in the heating chamber before the start of heating and starts heating when the temperature is lower than the predetermined temperature, and determines the cooking state detected by the temperature detection sensor after setting the temperature detection level and the number of times of detection as the amount of change in the detected temperature. In order to prepare the value, the temperature detection level and the number of detections, the magnetron and the fan motor are controlled to perform automatic cooking.

Description

Automatic cooking device for grill microwave oven and method thereof

1 is a schematic configuration diagram of a conventional grill microwave oven.

2 is a schematic configuration diagram of an automatic cooking apparatus for a grill microwave oven according to the present invention.

3 is a detailed configuration diagram of the sensor signal processing unit of FIG.

4 is an output waveform diagram of a sensor signal processing unit during initial operation of a hand load.

5 is an output waveform diagram of a sensor signal processing unit during continuous operation of a hand load.

6 is a flowchart of an automatic cooking process of a grill microwave oven according to the present invention.

* Explanation of symbols for main parts of the drawings

1: control unit 4: magnetron

12: temperature detection sensor 13: sensor signal processing unit

The present invention relates to a grill microwave oven, and in particular, to detect the thermal components of the steam generated during the ambient temperature detection and cooking at the same time to facilitate the configuration of the sensing unit, as well as to increase the efficiency of the continuous cooking of the grill microwave oven. An automatic cooking apparatus and a method thereof.

In the conventional grill microwave oven, as shown in FIG. 1 of the accompanying drawings, the control unit 1 controls the entire cooking operation according to the cooking state detection value and the temperature detection value of the heating chamber, and the control unit 1 A load chamber 2 for driving a load under control, a fan motor 3 for rotating the blower fan by driving the load drive 2, and a heating chamber at a high voltage by driving the load driver 2; (5) Marnetron (4) for generating electromagnetic waves (microwaves), turntable (6) for placing food (7), and temperature detection for detecting the temperature of the air discharged from the heating chamber (5) The controller 8, the cooking state detection sensor 9 for detecting the cooking state of the food 7, and the respective outputs obtained from the temperature / cooking state detection sensors 8, 9, and the above-described control unit. And first and second sensor signal processing units 10 and 11 for inputting to (1).

The operation of the conventional grill microwave oven configured as described above is as follows.

First, when the cooking start key is pressed by the user, the control unit 1 drives the load driving unit 2 to operate the fan motor 3.

In addition, the temperature of the heating chamber 5 obtained by the first sensor signal processing unit 10 is searched to determine whether the cooking temperature is possible.

As a result of this determination, when the temperature in the heating chamber 5 becomes below a predetermined value, the load driver 2 is operated.

Then, the load driver 2 drives the magnetron 4, and electromagnetic waves flow into the heating chamber 5 by the magnetron 4.

When electromagnetic waves flow into the heating chamber 5 as described above, the food 7 placed on the turntable 6 receives heat to generate water vapor, and the temperature detection sensor 8 detects the amount of water vapor generated therein. 1 is applied to the sensor signal processing unit 10.

In addition, when cooking proceeds, the cooking state detection sensor 9 is mounted near the exhaust port to detect the cooking state in response to a substance generated during cooking, and inputs the detection value to the second sensor signal processing unit 11.

Accordingly, the first sensor signal processing unit 10 converts the detection value obtained from the temperature detection sensor 8 into a digital signal and inputs it to the control unit 1 as the heating chamber temperature, and the second sensor signal processing unit (11) also processes the cooking state value detected from the cooking state detection sensor 9 as a digital signal to input the cooking state value to the control unit (1).

Then, the control unit 1 performs the automatic cooking by controlling the load driving unit 2 according to the input heating chamber temperature value and the cooking state value.

However, the conventional grill microwave oven requires a heating chamber temperature detection sensor and a cooking state detection sensor in order to proceed with automatic cooking, and also requires two signal processing means for processing the output values of the two sensors. As well as complexity, the cost has risen, so there was a problem that it is not economic.

In addition, before starting cooking, the temperature detection sensor detects the temperature in the heating chamber, and then proceeds with cooking. In this case, accurate temperature detection in the heating chamber is impossible due to the latent heat, which reduces the reliability of the device. there was.

Therefore, the present invention is to solve the above-mentioned problems of the prior art, an object of the present invention to detect the thermal components of the steam generated during the ambient temperature detection and cooking at the same time to facilitate the configuration of the sensing unit as well as continuous The present invention provides an automatic cooking apparatus for a grill microwave oven and a method thereof for increasing efficiency in cooking.

Technical means for achieving the object of the present invention is the temperature detecting means for detecting the exhaust temperature discharged from the heating chamber during cooking, and the heating chamber temperature and cooking so as to enable automatic cooking by processing the detection value obtained from the temperature detecting means Signal processing means for inputting the control value to the control means.

A method for achieving the object of the present invention comprises the first step of counting the blowing time by driving the pan and timer when the cooking start key is pressed and searching for the temperature value obtained from the signal processing means, and the temperature value is 1 If the temperature is lower than the actual temperature, the second step of searching for the presence of temperature change in the heating chamber is performed after the blowing time has elapsed, and compared with the second temperature value set for the continuous operation. In the third step of determining the presence and absence of heating in the third step, the magnetron is driven to start heating the food, and when the detection frequency of the detected temperature value elapses, the magnetron and the fan drive are stopped to automatically cook. The fourth step is to complete.

Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

2 is a block diagram of an automatic cooking apparatus for a grill microwave oven according to the present invention. As shown in the drawing, the control unit 1 controls the overall operation of automatic cooking according to the cooking state detection value and the temperature detection value of the heating chamber, and By the load drive unit 2 which drives a load under the control of the control part 1, the fan motor 3 which rotates a fan by the drive of the said load drive unit 2, and the drive of the said load drive unit 2 The magnetron 4 which generates electromagnetic waves (microwaves) in the heating chamber 5 at a high voltage, the turntable 6 for placing the food 7, and the temperature of the air discharged from the heating chamber 5 are detected. It consists of a temperature detection sensor 12 and a sensor signal processing unit 13 which processes a signal obtained from the temperature detection sensor 12 and inputs it to the control unit 1 as a heating chamber temperature value and a cooking state discrimination value.

The operation and effects of the automatic cooking apparatus of the grill microwave oven according to the present invention configured as described above will be described with reference to FIGS. 2 to 6.

First, when the automatic cooking start key is pressed by the user, the control unit 1 operates the fan motor 3 for driving the blowing fan through the load driving unit 2 to perform the blowing process, and to operate the internal tire. Start counting (ST1-ST2)

Thereafter, the heating chamber temperature value S3 obtained by the sensor signal processing unit 13 is searched to determine whether cooking is started.

As shown in FIG. 3, the sensor signal processing unit 13 displays the resistance value corresponding to the exhaust temperature obtained from the temperature detection sensor 12 and the voltage value divided by the resistor R1 at the present heating chamber 5. ) Is inputted to the first analog / digital port (A / D1) in the control unit 1 by the temperature (S3) in the control unit, and filtering and amplifying the voltage value divided by the resistor (R1) of the temperature detection sensor (13a). In 13b, the signal is filtered and amplified to a predetermined band and input to the second analog / digital port A / D2 in the controller 1.

Accordingly, the controller 1 compares the temperature S3 in the heating chamber input to the first analog / digital port A / D1 with the operable temperature α for the heating operation at the initial stage of cooking (ST3).

The temperature S3 and the cooking state determination value S4 in the heating chamber inputted to the first and second analog / digital ports (A / D1) (A / D2) in the control unit 1 are shown in FIG. Same as FIG.

That is, as the heating proceeds, the temperature detection sensor 12 outputs while showing a change according to the ambient temperature as shown in FIG.

At this time, when the heating proceeds to produce water vapor from the food (7), the heat of steam gives a thermal change to the temperature sensor 12, and again takes away the heat of vaporization by the wind to give the opposite thermal change again.

The waveform representing this phenomenon becomes the waveform of (a) in FIG. 4, and the waveform is filtered and amplified into a predetermined band through the filtering and amplifying unit 13b to form a waveform as shown in (b) of FIG. It is input to the second analog / digital port (A / D2) in 1).

If the heating operation is continuously performed, as shown in FIG. 5, the latent heat of the previous heating remains in the initial section (t _f ), and when the air is blown, it is cooled by the external cold wind and is heated in the heating chamber as shown in FIG. The temperature (S3) of the decreases but the cooking state determination value (S4) shows a large signal waveform as shown in (b) of FIG. 5 due to the influence of the initial latent heat.

Therefore, the control unit 1 compares the heating chamber temperature value S3 and the operating temperature α as described above (ST4) in the initial stage of heating, when the detected temperature value S3 is larger than the operating temperature α. Will continue the blowing process.

Thereafter, when the temperature value S3 of the heating chamber becomes lower than the operable temperature α by the blowing operation, the presence or absence of the blowing time t is searched for (ST5).

After the blowing time has elapsed (t _f ), the next step is to calculate the change amount t1 of the heating chamber temperature (ST6), and the reference value (β) set to determine the calculated temperature change amount t1 and continuous operation. Is compared with (ST7).

As a result of this comparison, when the temperature change amount t1 is larger than the reference value β, the detection level V _TH for controlling the magnetron is set. It is set to ', and the number of detections (N) for how many times the signal above the detection level (V _TH ) is detected is set to δ' (ST9).

When the temperature change amount t1 is smaller than the reference value β, the detection level V _TH for controlling the magnetron is set. The number of detections (N) for how many times the signal above the detection level (V _TH ) is detected is set to δ (ST8).

Subsequently, the magnetron 4 is driven by controlling the load driver 2 for heating (ST10), and the cooking state value S4 input to the second analog / digital port A / D2 is read (ST11). ).

In addition, the temperature value t2 corresponding to the read cooking state value S4 is compared with the detection level V _TH (ST12).

If the detected temperature value t2 is less than the detection level V _TH , the present operation is continued. If the detected temperature value t2 is greater than the detection level V _TH , the count count i ) Is increased by 1 (i + i + 1) (ST13), and the increased count value i is compared with the number of times of detection (N) (ST14).

At this time, if the increased count value (i) is less than the detection frequency (N), the current operation is continued to heat the food (7), and the increased count value (i) is greater than or equal to the detection frequency (N) When it is determined that the automatic cooking is completed, the driving of the magnetron 4 and the fan motor 3 through the load driving unit 2 is stopped (ST15) to complete the automatic cooking.

As described above, the present invention enables the temperature detection and the cooking state detection for automatic cooking with one temperature detection sensor and sensor signal processing means in the grill microwave, so that the device can be easily configured and the cost can be reduced. It works.

In addition, the effects of latent heat during continuous operation can be reduced, thereby improving the performance of automatic cooking.

Claims (3)

Temperature detecting means for detecting the exhaust temperature discharged from the heating chamber during cooking, and resistance (R1) input to the control means as the heating chamber temperature value by using the detected value in the temperature detecting means as the voltage value divided by the resistance. And a filtering and amplifying unit 13b for filtering and amplifying the signal output from the temperature detecting means and the resistor R1 and applying the cooking state discrimination value to the control means. And a signal processing means for inputting to the control means at a heating chamber temperature and a cooking state discrimination value so as to enable automatic cooking by processing. An automatic cooking apparatus of a grill microwave oven, which processes a signal detected by a temperature detecting means in a microwave oven having a grill function by a signal processing means and processes an input signal by a control means, wherein when a cooking start key is pressed, a pan and a timer The first step of counting and retrieving the heating chamber temperature value obtained by the signal processing means, and if the heating chamber temperature value is greater than the first actual temperature (α) is blown and the blowing time is elapsed. The second step of searching for the change of the temperature value of and comparing the changed temperature value (t1) with the second temperature value (β) preset for continuous operation, and according to the result detection (V _TH ) and the number of detection The third step of setting (N), and the magnetron is started to start the heating of the food and compare the detected cooking state determination value (t2) and the detection level (V _TH ) to perform automatic cooking. Automatic cooking method of the microwave oven, characterized in that the fourth step is made. 3. The method of claim 2, wherein the fourth step comprises a first step of searching for a detected cooking state determination value t2 and comparing the detected cooking state determination value t2 with the detection level V _TH . In the second step, when the cooking state determination value t2 is greater than the detection level V _TH , the number of detections i is increased by one, and the increased number of detections i is compared with the set number of detections N. In the third step and when the increased number of detections i is smaller than the set number of detections N, the heating operation is continuously performed, and when the increased number of detections i is greater than the set number of detections N, And a fourth step of determining that cooking is completed and stopping driving of the magnetron and the fan motor.