KR940005057B1 - Automatic cooking control method of microwave oven - Google Patents

Abstract

The method is disclosed in which a high-frequency wave oscillates, a heating time counts up to detect the output value of a gas sensor, if the output value is above a first sensing value, a heating time until the first sensing value is calculated, if the heating time is above a predetermined time, another heating time counts up to calculate a heating time until a second sensing value, the absence or presence of a cover and the amount of food are decided according to the heating times, an additional heating time is calculated with a different coefficient to the heating times, and the added heating time is displayed, thereby performing optimal cooking.

Description

Automatic cooking control method of microwave oven

1 is a signal flow diagram showing a conventional automatic cooking control method of a microwave oven.

2 is a graph showing a conventional gas sensor pattern.

3 is a perspective view of a typical microwave oven.

4 is a block diagram of the automatic cooking control device of the present invention a microwave oven.

Figure 5 is a signal flow diagram illustrating a method for automatic cooking control of the microwave oven of the present invention.

Figures 6a to d is a characteristic diagram showing a large amount and a small amount of food according to the presence or absence of a lid for the present invention.

7 is a diagram showing the estimation of additional heating time for the present invention.

* Explanation of symbols for main parts of the drawings

1: Door 2: Cavity

3: control unit 4: central processing unit

5: key input unit 6: sensor unit

7: high frequency oscillation drive unit 8: fan / motor drive unit

9 display unit

The present invention relates to automatic cooking using a gas sensor of a microwave oven, and in particular, it is possible to determine the food quantity and whether the lid is covered by the conventional gas sensor alone to perform the optimum cooking in any situation. I would have to.

In general, when cooking using a gas sensor in a microwave oven, the time until a certain voltage appears by reading the output voltage of the sensor that detects the gas generated from food is called t1, and the intrinsic constant according to each food type Place (K) to determine additional heating time to determine the cooking time.

That is, since T = t1 + Kt (where T is the total cooking time, t1 is the time it takes for the output of the gas sensor to reach a certain point, K is a constant), the greater the amount of food, the longer the t1 time. .

Therefore, as shown in FIG. 1 and FIG. 2, when food is put into the microwave cavity and automatic cooking is performed, the amount of gas generated in the food increases with time, and when the high frequency starts oscillation, t1 (CNT1) While counting up the time, the output value Va of the gas sensor is determined.

After calculating the time t1 at which Va has already reached the value Vs determined by the test, the additional heating time t2 is calculated by t2 = Kt1 (K: constant) and displayed on the display unit. When t2 is counted down, the cooking end indication is indicated by beep sound, and then completed.

However, in the conventional automatic cooking control method, the output pattern of the gas sensor differs depending on the presence or absence of a lid even if the food is the same as shown in FIGS. 6a and c, and the time taken for the gas concentration to increase to a certain voltage is different. A cooking result that satisfies either side (eg with a lid) was obtained.

That is, when the consumer cooks without a lid, a problem occurs that results in unripe food.

In order to solve the conventional problems, the present invention senses the presence and absence of a lid according to the length of time (ta, tb) by sensing two times and then determine the additional heating time to perform the optimal cooking. Invented a method for automatic cooking control of a microwave oven, described with reference to the accompanying drawings as follows.

3 is a perspective view of a general microwave oven, and FIG. 4 is a block diagram of an automatic cooking control device for a microwave oven according to the present invention. As shown therein, a cavity 2 capable of heating food and a cooking key are provided. Key input unit (5) capable of inputting the sensor, sensor unit (6) capable of detecting the gas concentration from the sensor, the key input unit 5 and the sensor unit 6 receives information from the function of the present invention A central processing unit (4) for controlling each unit to perform the operation, a high frequency oscillation driving unit (7) generating a high frequency by receiving a signal from the central processing unit (4), and a fan / motor for driving a fan or a rotating table The driving unit 8 and the display unit 9 which displays the remaining time (additional heating time) during automatic cooking, etc., and reference numerals 1 and 3 in the drawings are doors and control units. .

The operation and effects of the present invention configured as described above will be described with reference to FIGS. 3 to 7.

First, when food is put into a microwave oven and an automatic cooking key is input by the key input unit 5, the sensor unit 6 determines whether the sensor is disconnected, and discharges residual gas in the cavity 2, and then the high frequency oscillation driving unit 7 To generate a high frequency.

At this time, if the amount of food is large and the lid is covered, the output pattern of the gas sensor is shown as Figure 6c.

That is, the output value Va of the gas sensor is determined while counting up by one second in the first sensing period, and the time until the value Vs1 determined according to the type of food is calculated and is referred to as ta (CNTa). The time from the sensing section to the second sensing value Vs2 is calculated and referred to as tb (CNTb).

At this time, it is determined that the ta time is greater than or less than t200 (which is an example of a time of 200 sec), and it is determined whether the tb time is greater than or less than t400, so that the amount of food, as shown in FIGS. Judging, the appropriate additional heating time in each case is calculated as shown in FIG.

Therefore, when the four cases described above are tested and substituted into t2 = K (7) (ta + tb) using a predetermined constant (K1-K4), the additional heating time (t2) is calculated. Heating time (T)

T = ta + tb + K (7) (ta + tb).

The cooking is terminated by displaying and heating the additional heating time t2 calculated in each case by the display unit 9 as described above.

As described in detail above, it was not possible to determine whether to use the lid in the prior art, but in the present invention, the effect of performing the optimum cooking by judging the presence or absence of the lid as the time (t1, tb) determined by the first and second sensing. Will be.

Claims (1)

When the high frequency oscillates by scanning the auto cooking key, the heating time CNT1 is counted up and the output value Va of the gas sensor is detected. If the output value Va is equal to or greater than the primary sensing value Vs1, the primary sensing value is detected. The heating time ta up to Vs1 is calculated, and if the calculated heating time ta is longer than a predetermined time, the heating time ta is repeatedly performed while counting up another heating time CNTb again to the second sensing value Vs2. The heating time (tb) is calculated, and the heating time (ta), (tb) determines whether there is a large or small amount of food and food, and multiplies the heating time (ta + tb) by varying the constant (K). The method of calculating the additional heating time (t2), displaying the calculated additional heating time (t2) and counting down to complete cooking.