KR100206633B1 - Sensing method of absolute humidity coinciding with the change of output of power - Google Patents

Abstract

The present invention relates to a control method for automatic cooking of a microwave oven. In particular, the automatic cooking of the microwave by sensing the absolute humidity according to the change of the high frequency output during the automatic cooking of the microwave oven using the humidity sensor and proceeding the additional time when the sensing is completed. When the automatic cooking is started to increase the cooking efficiency and the number of sensor application menus by applying the timely output, the first process of inspecting and initializing the preheating state of the sensor and sensing the absolute humidity according to the change of the high frequency output. The present invention relates to an absolute humidity sensing method according to an output change which is sequentially operated as a second process of advancing additional time when completed.

Description

Absolute humidity sensing method according to output change

1 is a block diagram of a high absolute humidity detection apparatus of a microwave oven for the present invention.

Figure 2 is a humidity detection waveform diagram for the present invention.

3 is a flowchart illustrating an absolute humidity sensing method according to an output change according to the present invention.

* Explanation of symbols for main parts of the drawings

One; Micom 2; Frequency input external interrupt

3; High frequency output controller 4; Absolute humidity sensing means

The present invention relates to an automatic cooking control method of a microwave oven, and in particular, by sensing an absolute humidity according to a change of a high frequency output during automatic cooking of a microwave oven using a humidity sensor, when the detection is completed, an additional time is progressed to automatically operate the microwave oven. It relates to an absolute humidity sensing method suitable for cooking characteristics during cooking.

In general, microwave ovens can be used as a heating means by installing grill heaters, convection heaters, and convection fans in addition to magnetrons. By driving the convection fan installed at the rear of the convection heater while driving at the same time by the convection motor, the hot air is circulated inside the cooking chamber to cook by the oven function.

When cooking by heating the food by heating means such as a magnetron and a heater as described above, the automatic cooking control is to control the cooking time, that is, the heating time, according to the automatic cooking method and program type by the sensor type There is an automatic cooking method by the sensor type. The automatic cooking method of the sensor type is an automatic cooking control method which automatically detects the humidity generated from the food according to the heating by using a humidity sensor and automatically controls the cooking time. Is an automatic cooking control method that performs heating control during the cooking time by finding the cooking time defined by the experiment in advance by manually inputting the cooking amount according to the cooking name and serving.

In the case of the microwave oven that controls the automatic cooking using the absolute humidity sensor in the automatic cooking control method, the control method used for sensing the absolute humidity detects the absolute temperature during the detection time after initializing by checking the preheating state of the sensor. Proceed with additional time.

In this operation, the output of the high frequency during the sensing time is all fixed at full-power, and the additional time advances the sensing time.

However, in the conventional sensing method of detecting absolute humidity as described above, the absolute humidity, which has been reduced by the high frequency heating when the resident wave output is changed during the detection time, has a higher absolute humidity than the vapor in the air due to the high frequency off and the fan operation. Absolute humidity rises by inhaling outside air into the air, and there is a problem that sensing errors occur due to an increase in absolute humidity, and when a high-frequency output of the sensing time proceeds to full power, a small amount of food and In the case of foods with little moisture, there is a problem that an error of sensing occurs according to the use conditions, and thus there is a problem that the selection range of the automatic cooking menu using the absolute humidity sensor is limited.

Accordingly, the present invention was devised to solve the above-mentioned problems of the prior art, by sensing the absolute humidity according to the change of the high frequency output during the automatic cooking of a microwave oven using a humidity sensor, and when the detection is completed, an additional time is advanced. The purpose of the present invention is to provide an absolute humidity sensing method according to the output change to improve the cooking performance by controlling the sensor with the optimum output for the automatic cooking of the microwave oven.

The present invention for achieving the above object, the first process of inspecting and initializing the preheating state of the sensor when automatic cooking is started, and the additional time when the sensing is completed by sensing the absolute humidity according to the change of the high frequency output It is characterized in that the second operation proceeds sequentially.

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

Microwave absolute humidity detection apparatus for a microwave oven for the present invention, as shown in Figure 1, the microcomputer (1) for controlling the overall function of the microwave; A frequency input external interrupt (2) which issues an external interrupt to input the frequency into the microcomputer (1); A high frequency output controller (3) for controlling a high frequency output under the control of the microcomputer (1) according to the frequency input from the frequency input external interrupt (2); Under the control of the microcomputer (1) is composed of an absolute humidity sensing means (4) for sensing the absolute humidity according to the high frequency output changed from the high frequency output controller (3).

The operation and effects of the present invention using the apparatus for detecting the absolute humidity of the microwave oven configured as described above will be described in detail as follows.

First, when automatic cooking is selected by using the keyboard of the microwave oven, the microcomputer 1 determines whether the absolute humidity sensor of the absolute humidity sensing means 4 attached as a screw to the upper plate surface of the cooking chamber exhaust port of the microwave oven is preheated. When the humidity sensor is preheated, the initialization is completed, and the value at this time is set as a reference value.

Subsequently, the absolute humidity is detected after the initialization is completed as described above, and the difference between the currently detected sensing value and the reference value detected at the initialization is preset according to the cooking menu and compared with the limit value for each cooking input to the microcomputer.

When the difference between the sensed value and the reference value compared as described above is less than the threshold value, the microcomputer 1 indicates the time when the input terminal P1 of the high frequency output controller 3 is turned on, as shown in FIG. As a reference, the time is counted using the frequency input from the output terminal P0 of the frequency input external interrupt 2.

When the counting value is greater than or equal to the delay time t1 set as the absolute humidity stabilization time, as shown in (b) of FIG. 2, the absolute humidity is sensed by controlling the absolute humidity sensing means 4 and then the sensing value. Is stored as data in the microcomputer (1).

Here, the delay time t1 set as the absolute humidity stabilization time is a rest time for preventing the sensing malfunction due to the increase in the absolute humidity due to the intake of the external air and the pre-heating state of the high frequency.

The microcomputer 1 compares the difference between the sensing value currently sensed and stored in the memory and the reference value sensed at the time of initialization to a preset threshold value according to a cooking menu, and when the threshold value is greater than or equal to the threshold value, sets a detection completion flag to complete the sensing. , Proceed with the additional time to end the cooking.

On the other hand, when the input terminal 91 of the high frequency output controller 3, which was turned on as described above, is turned off as shown in FIG. 2A, a counter for counting the delay time t1 set as the absolute humidity stabilization time is counted. Clear to 0 to end sensing.

When the operation is shown in a flow chart as shown in FIG. 3, a first process (100) for checking and initializing a preheating state of a sensor when automatic cooking is started; When the sensing is completed by sensing the absolute humidity according to the change of the high frequency output, the second process 200 proceeds with the additional time.

The first step (100) comprises a first step (101) of checking the preheating state of the sensor when automatic cooking is started; A second step (102) of checking whether the initialization is completed after checking the preheating state of the sensor; Operation proceeds sequentially to a third step 103 of proceeding with initialization until the initialization is completed.

The second process 20 includes a first step 201 of determining whether absolute humidity detection is completed after initialization is completed; A second step 202 of determining whether a difference between a sensing value currently sensed and a reference value detected at initialization when the absolute humidity detection is not completed is greater than or equal to a preset threshold value according to a cooking menu; A third step 203 of determining whether the high frequency output is turned on when the difference between the sensing value and the reference value is less than the threshold value; A fourth step 204 of clearing the counter to zero when the high frequency output is not turned on; A fifth step 205 of determining whether the counter value is greater than or equal to the absolute humidity stabilization time t1 when the high frequency output is turned on; A sixth step 206 of terminating the sensing when the counter value is less than the absolute humidity stabilization time t1 or the counter is cleared to zero; A seventh step 207 of sensing absolute humidity and storing the sensing value in data when the counter value is greater than or equal to the absolute humidity stabilization time t1; An eighth step 208 of completing a detection by setting a flag when the difference between the sensing value stored in the data and the reference value is greater than or equal to the threshold value; When the detection is completed, the operation proceeds sequentially to the ninth step 209 where the additional time is completed to end the cooking.

As described in detail above, the present invention senses the absolute humidity according to the change of the high frequency output during the automatic cooking of the microwave oven using the humidity sensor, and when the detection is completed, an additional time is progressed so that the output is suitable for cooking during the automatic cooking of the microwave oven. Cooking performance can be improved by controlling the cooking process, and automatic cooking of cooking menus with low moisture content is also possible, which increases the number of automatic menus by sensors applied to the product, improving consumer confidence and purchasing power of the product. It can be effective.

Claims (1)

Operating a first process of inspecting and initializing a preheating state of the sensor when auto cooking is started, and determining whether absolute humidity sensing is completed after the initialization is completed; Determining whether the difference between the currently sensed sensing value and the reference value detected at initialization is greater than or equal to a preset threshold value according to the cooking menu when the absolute humidity detection is not completed; Determining whether the high frequency output is turned on when the difference between the sensing value and the reference value is less than the threshold value (203); Clearing the counter to '0' if the high frequency output is not turned on (204); Determining whether the counter value is greater than or equal to the absolute humidity stabilization time when the high frequency output is turned on (205); Ending sensing if the counter value is less than the absolute humidity stabilization time or if the counter is cleared to '0' (206); Sensing the absolute humidity when the counter value is greater than or equal to the absolute humidity stabilization time and storing the sensing value in the data (207); If the difference between the sensing value stored in the data and the reference value is greater than or equal to the threshold value, setting the detection completion flag to complete the detection (208); When the detection is completed, the absolute humidity sensing method according to the output change, characterized in that the step (209) to proceed with the additional time to terminate the cooking in sequence.