KR920005819B1 - Automatic cooking method for microwave oven - Google Patents

Abstract

A magnetron (6) is driven by a microprocessor (1) to heat a heating room (2) for a certain period of time. After elapsing of the certain period of time (t1), an increment value, which results fromthe discharge temperature and the moisture level in the discharge gas, is detected by a fuzzy control section (1a), thereby recognizing the kind of the food. Depending on the kind of food, the time (t1) is multiplied by a certain value (a) to determine a second time (t2). If the discharge temperature and the discharge moisture exceed a certain level during a total time (t3), the cooking is terminated,while if they do not exceed, the heating is continued.

Description

Microwave food recognition and automatic cooking

1 is a block diagram of a food recognition system of a conventional microwave oven.

2 is a block diagram of a food recognition and automatic cooking system of the present invention microwave oven.

3 is a detailed view of the weight sensing circuit portion of FIG.

4 is a detailed view of the power supply with respect to FIG.

FIG. 5 is a detailed view of the temperature sensing circuit portion of FIG. 2. FIG.

6 is a function diagram of a fuzzy control unit for FIG.

Figure 7 (a) is a temperature, humidity characteristics according to the heating time during thawing of the present invention.

(b) is a graph of thawing time according to the weight of the present invention.

8 is an explanatory diagram showing the operation of the present invention.

9 is an exemplary view showing cooking type recognition according to the exhaust temperature sensor and the exhaust humidity sensor according to FIG.

FIG. 10 is a function diagram showing an example of exhaust temperature and exhaust humidity according to the exhaust temperature sensing unit and the exhaust humidity sensing unit with respect to FIG.

11 is an explanatory diagram showing an operation example of the present invention.

12 is a signal flow diagram for FIG.

* Explanation of symbols for main parts of the drawings

1: microcomputer 2: heating room

3: weight sensing element 4: weight monitoring circuit part

5: power supply unit 6: magnetron

7: cooling fan 8: intake air temperature sensor

9, 13: temperature sensing circuit 10: humidity sensor

11 humidity sensor circuit 12 exhaust temperature sensor

The present invention relates to a food recognition and automatic cooking method using the fuzzy control, in particular to automatically recognize the type of food in a cooking apparatus such as a microwave oven, so that one-touch to automatically perform the cooking completion It relates to a food recognition and automatic cooking method of a microwave oven.

In the conventional microwave food recognition system configuration, as shown in FIG. 1 of the accompanying drawings, the turntable 13 is mounted at a lower portion of the heating chamber 2, which is a space for heating the food 15 of the microwave oven, and the heating is performed. The turntable motor 12 is connected to the lower part of the seal 2, and the weight sensing element 3 is mounted to the lower part of the turntable motor 12 to detect an electrical signal that detects the weight W of the food 15. 4) is input to the control unit 1 through, and the ultrasonic sensor 8 that can measure the distance (d) to the surface of the food (15) is mounted on the heating chamber (2) by sending and receiving ultrasonic waves The magnetron 6 which inputs the obtained electrical signal to the control unit 1 through the sensing unit 9 and receives the control signal of the control unit 1 through the driving unit 5 to generate microwaves in the microwave oven is a heating chamber. It is mounted through the wall of (2), and a cooling fan (7) is mounted near the magnetron (6). In addition to cooling the high heat of the magnetron 6, some air introduced by the cooling fan 7 is sucked into the heating chamber 2 through the suction guide 16 formed in the heating chamber 2, while the magnetron Gas and water vapor generated in the food 15 in the heating chamber 2 by the microwaves oscillated in (6), together with the suction air through the suction guide 16, the exhaust guide formed on the upper side of the heating chamber 2 (17) Exhaust gas, and a gas detector 10 is mounted in the exhaust guide 17 to detect an amount of water vapor or gas generated in the food 15 and input an electrical signal to the control unit 1 through the sensing unit 11. In the drawing, reference numeral 14 denotes a keyboard for driving the controller 1.

Here, the ultrasonic sensor 8 is mounted at a distance 1 from the top center of the heating chamber 2, the distance from the turntable 13 surface to the top of the heating chamber 2 is H, and the height of the food 15 is h.

Referring to the operation of the conventional food recognition system configured as described above is as follows.

When power is supplied to the system, the food 15 is placed on the turntable 13 in the heating chamber 2, and the user operates the keyboard 14, the turntable motor 12 is driven to turn the turntable 13 and At the same time as the food 15 rotates, the weight sensing element 3 mounted on the lower portion of the turntable motor 12 detects the weight W of the food 15 and detects the corresponding electrical signal through the sensing unit 4. The ultrasonic sensor 8 applied to the input of the control unit 1 and mounted at a distance l from the center of the heating chamber 2 is driven by the drive signals of the control unit 1 and the sensing unit 9. The controller transmits the ultrasonic wave to the food 15 and receives the ultrasonic wave reflected from the food 15 to control the omnidirectional signal corresponding to the distance d to the surface of the food 15 through the sensing unit 9. The control unit 1 detects the weight sensor 3 and the ultrasonic sensor 8 by applying it to (1). It is the operation signal. That is, the controller 1 calculates the weight W of the food 15 from the electrical signal sent from the weight sensing element 3, and measures the weight of the food 15 with the distance d measured from the ultrasonic sensor 8. Calculate the height h. Where the height h of the food 15 is h = H-d.

When the height h of the food 15 is obtained, the volume V of the food 15 is calculated. When the volume V of the food 15 is calculated, the density D of the food 15 is calculated. . That is, since the density (D) = weight (W) / volume (V) of the food 15 placed on the turntable 13 is controlled, the control unit 1 recognizes what food is placed on the turntable 13. The control signal is outputted, and the signal drives the magnetron 6 through the driving unit 5, so that microwaves are oscillated in the magnetron 6 to heat the food 15, and the food 15 by microwaves. The gas and water vapor generated during the heating are discharged to the exhaust guide 17 together with the air sucked into the suction guide 16 and the heating chamber 2 by the cooling fan 7, and is mounted in the exhaust guide 17 at this time. After the gas detection unit 10 continues to detect the amount of water vapor or gas from the food 15 and calculates an electrical signal corresponding thereto, capturing the completion time of cooking and ending the cooking to perform automatic cooking.

However, in the conventional microwave food recognition system, when measuring the height by rotating the food placed on the turntable, the reliability of the transmission and reception ultrasonic wave varies depending on the surface condition of the food. This is only possible with a high-level computer-based microcomputer, which increases the price of the product. In other words, when calculating the volume, a complicated numerical analysis program and a computational power microcomputer are required, and if the food is a mixture, if it is similar to the density of other pure foods, the food is recognized differently, causing malfunctions. The same food has a problem of malfunction because the food recognition reliability is lowered because the density varies depending on the moisture content.

In view of the above-described problems, the present invention uses a temperature sensor for detecting intake temperature and exhaust temperature, a humidity sensor for detecting exhaust humidity, and a weight sensor for detecting the weight of food to change the humidity and temperature after a predetermined time. Detect the type of food by detecting the food, calculate the recognition time of the cooking type and the time until the change point, that is, the total heating time to determine the completion of automatic cooking when the exhaust temperature and humidity is above the set value, frozen food In this case, after calculating the heating time based on the weight detected by the weight sensor, if the temperature and humidity do not change for a certain time, it is recognized as frozen food and keeps heating, and the system is operated to be operated with one touch. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic diagram of the food recognition and automatic cooking system of the present invention, and FIGS. 3, 4, and 5 are detailed views of the weight sensing circuit unit power supply unit and the temperature sensing circuit unit as shown in FIG. A microcomputer (1) comprising a ROM (1b), a central processing unit (1c), a data RAM (1d), and a fuzzy control unit (1a) to control the overall operation of the microwave oven according to the key operation of the keyboard 19; In order to supply the operating power of the AC power source AC under the control of the microcomputer 1, a power supply unit 5 composed of a high voltage transformer T1, a capacitor C1, and a diode D1, and the power supply unit 5 A magnetron 6 for driving microwaves according to an output power source, a heating chamber 2 for heating food 18 with microwaves generated from the magnetron 6, and a suction guide formed in the heating chamber 2; Cooling the magnetron 6 while introducing air to the inlet 21 and the inlet 15. A fan 7, an intake air temperature sensor 8 for sensing a temperature of air flowing into the inlet 15 of the heating chamber 2, and a temperature signal of intake air detected by the intake air temperature sensor 8 In order to convert an electrical signal into a temperature sensing circuit section 9 composed of resistors R1, R2, and capacitors C2, C3, food 18 and turntable 17 in the heating chamber 2, the microcomputer (1) a turntable motor 16 to rotate in accordance with the control signal, a weight sensing element 3 for sensing the weight W of the food 18 placed on the turntable 17, and the weight sensing element ( 3) a weight sensing circuit section 4 composed of a filter 4a and an amplifier 4b to remove noise from the output signal of 3) and amplify the signal, and an exhaust guide 22 and an exhaust port of the heating chamber 2; 14, the exhaust temperature sensor 12 and the humidity sensor 10 for detecting the temperature and humidity of the air flowing out, and the temperature signal of the exhaust air detected by the exhaust temperature sensor 12 In order to convert the red signal into a temperature sensing circuit unit 13 composed of a resistor (R1) (R2), a capacitor (C2) (C3), and a signal of the discharge humidity detected by the humidity sensor (3) to convert into an electrical signal The output voltages of the humidity sensing circuit section 11, the temperature sensing circuit sections 9 and 13, the weight sensing circuit section 4, and the humidity sensing circuit section 11 are converted into digital signals, and the purge control section of the microcomputer 1 The analog / digital converter 23 input to 1a) and the display unit 20 for displaying various states of the microwave oven according to the control signal of the microcomputer 1 are shown. A power supply terminal connected to the circuit sections 9 and 13, and Vout is an output terminal of the temperature sensing circuit sections 9 and 13.

Here, the purge control unit 1a may be qualified by a change in the exhaust temperature, exhaust humidity, suction temperature, and weight applied from the temperature sensing circuits 9 and 13, the humidity sensing circuit 11, and the weight sensing circuit 4. Membership) is used to control the level so that the microcomputer 1 recognizes the type of food 18 and the completion of cooking.

Referring to the operation, effects of the present invention configured as described above in detail.

When the user puts the food 18 to cook on the turntable 17 in the heating chamber 2 and presses the cooking start key of the keyboard 19 to start cooking, the data of the keyboard 19 is stored in the data RAM of the microcomputer 1. The turntable motor 16 is driven in accordance with the execution of the program stored in the program ROM 1b and rotates the turntable 17 and the food 18 in accordance with the execution of the program stored in the program table 1b, and at the bottom of the turntable motor 16. The mounted weight sensing element 3 senses the weight W of the food 18 and applies it to the filter 4a of the weight sensing circuit portion 4, and the filter 4a of the weight sensing circuit portion 4 is a weight sensing element. The noise is removed from the weight sensing signal detected from (3), and this signal is amplified by the amplifier 4b and applied to the analog / digital converter 23.

At the same time, the power supply unit 5 is driven in accordance with the control signal of the microcomputer 1 so that the AC power source AC is boosted through the high voltage transformer T11, and this voltage is a half-wave back pressure composed of the capacitor C1 and the diode D1. The magnetron 6 is driven after being converted into a high-voltage direct current power source through a circuit, so that microwaves are oscillated in the magnetron 6, and the food 18 in the heating chamber 2 is fixed as shown in FIG. In addition to heating during t1), the cooling fan 7 is driven to cool the magnetron 6, and some air is supplied by the suction guide 21 and the suction port of the heating chamber 2 by driving the cooling fan 7. It enters into the heating chamber 2 through the 15. At this time, if the intake temperature sensor 8 senses the temperature of the air flowing into the inlet 15 of the heating chamber 2 and applies it to the temperature sensing circuit unit 9, the resistors R1, R2, and C2, C3 (C3). The temperature sensing circuit unit 9 is converted into an electrical signal corresponding to the temperature of the air and applied to the analog / digital converter 23.

In addition, the air introduced into the suction port 15 of the heating chamber 2 is exhausted from the exhaust port 14 and exhaust of the heating chamber 2 together with the gas and water vapor generated by the food 18 being heated by the microwaves of the magnetron 6. The exhaust gas is discharged to the guide 22. At this time, the exhaust temperature sensor 12 and the humidity sensor 10 detect the exhaust temperature A and the exhaust humidity B discharged to the exhaust port 14, and the temperature sensing circuit unit ( 13) and the humidity detection circuit unit 11 converts the electrical signals corresponding to the exhaust temperature A and the exhaust humidity B to be applied to the analog / digital converter 23.

That is, the current of the exhaust temperature (A) and the exhaust humidity (B) at which the exhaust temperature sensor 12 and the humidity sensor 10 are discharged to the exhaust port 14 of the heating chamber 2 as shown in FIGS. The temperature T1 and the current humidity H1 are sensed, and the detected temperature and humidity signals are converted into corresponding electrical signals through the temperature sensing circuit 13 and the humidity sensing circuit 11, and analog / digital. The converter 23 converts the digital signal into a digital signal and stores the data in the data RAM 1d of the microcomputer 1 through the fuzzy control unit 1a.

T)(

H) 즉, 배기온도센서(12) 및 습도센서(10)가 감지한 배기온도(A) 및 배기습도(B)가 일정온도(T2), 일정습도(H2)로 되면 퍼지제어부(1a)가 이를 연산처리하여 이에따른 제어신호를 마이컴(1)에 인가하게 되므로써 마이컴(1)이 일정시간(t1)동안 배기온도(A) 및 배기습도(B)의 일정값(

T)(

H)을 감지하여 제9도와 같이 음식(18)의 종류를 인식하게 된다. 즉 일정시간(t1)동안 가열하여도 배기온도(A) 및 배기습도(B)의 증가분이 제7도 및 제9도와 같이

T=0일 경우에는 냉동식품으로 인식한 후 일정시간(t1)을 마이컴(1)의 데이타램(1d)에 저장하고, 요리할 음식(18)의 종류에 따라 설정된 일정값(

)을 일정시간(t1)에 곱하여 2차가열시간(t2)을 계산한 후 전체요리시간(t3)동안 마그네트론(6)을 계속 구동시켜 음식(18)을 가열한다. 여기서 전체요리시간(t3)는 t3=t1+t2=t1+

.t1이고, t1=t1', t2=t2'이다.In this state, as shown in FIGS. 6, 10, and 8 and 11, the food 18 is heated by the microwave of the magnetron 6 for a predetermined time t1, so that the exhaust port of the heating chamber 2 ( 14) the exhaust temperature (A) and the exhaust humidity (B) is gradually increased as shown in FIG. 10, the exhaust temperature sensor 12 and the humidity sensor 10 detects this and the temperature sensing circuit unit 13 and humidity After converting the electric signal through the sensing circuit unit 11 and converting the digital signal through the analog / digital converter 23 to the fuzzy control unit 1a, the fuzzy control unit 1a converts it as shown in FIGS. 6 and 10. Given the qualification function (MF) according to the exhaust temperature (A) and the exhaust humidity (B), the probability from zero to "1" is calculated, that is, the exhaust temperature (A) and the exhaust humidity (B) Likewise, if the cooking temperature is 100 ° C and 100%, the probability of cooking is almost close to 1, and then stored in the data RAM 1d of the microcomputer 1. In this state, the increase in exhaust temperature A and exhaust humidity B increased by a constant value (

T) (

H) That is, when the exhaust temperature A and the exhaust humidity B detected by the exhaust temperature sensor 12 and the humidity sensor 10 become the constant temperature T2 and the constant humidity H2, the purge control unit 1a The calculation process is performed to apply the control signal to the microcomputer 1 so that the microcomputer 1 has a constant value of the exhaust temperature A and the exhaust humidity B for a predetermined time t1.

T) (

H) to detect the type of food 18 as shown in FIG. That is, even after heating for a predetermined time (t1), the increase of exhaust temperature (A) and exhaust humidity (B) is shown in FIG. 7 and FIG.

If T = 0, it is recognized as a frozen food, and then a predetermined time t1 is stored in the data RAM 1d of the microcomputer 1, and a predetermined value according to the type of food 18 to be cooked (

) Is multiplied by a predetermined time (t1) to calculate the secondary heating time (t2) and then heating the food 18 by continuing to drive the magnetron (6) for the entire cooking time (t3). Where the total cooking time (t3) is t3 = t1 + t2 = t1 +

t1, t1 = t1 ', t2 = t2'.

And when it is detected as a frozen food as shown in (a) (b) of FIG. 7 the total cooking time (t) by multiplying the weight (W) of the food (18) detected by the weight sensing element 3 by a predetermined value (k) ), The magnetron (6) is driven to heat the food (18), and if heated for the entire cooking time (t3), if the exhaust temperature (A) and the exhaust humidity (B) do not exceed a certain value, the heating is continued. Complete the dish upon reaching.

As described above, the present invention detects a change in the exhaust temperature and the exhaust humidity discharged to the exhaust port of the heating chamber for a predetermined time, recognizes the type of food, and sets the heating time according to the recognized food type. It is effective.

Claims (1)

The microcomputer 1 performs an initial operation to control the air temperature inside the heating chamber 2 to be in equilibrium, and drives the magnetron 6 to exhaust the exhaust gas from the exhaust port 14 of the heating chamber 2. In the automatic cooking method of the microwave oven for sensing the temperature and the weight (W) of the food 18 in the heating chamber 2 until the temperature of the air discharged from the exhaust port 14 is increased by a set temperature increase. In this case, the microcomputer 1 drives the magnetron 6 for a predetermined time t1 to heat the food 18 in the heating chamber 2, and when the predetermined time t1 elapses, the exhaust port of the heating chamber 2. (14) A constant value according to the increase of exhaust temperature (A) and exhaust humidity (B) discharged to (

T) (

H is sensed by the purge control unit 1a to recognize the type of food 18 and set a predetermined value according to the type of food 18 to be cooked (

) Is multiplied by a certain time (t1) to calculate the secondary heating time (t2) and heats it up. If you keep heating, microwave oven's food recognition and automatic cooking method.

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