JPS6122596A - Controller of composite heating cooking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a control device for a composite heating cooker.

In particular, the present invention relates to a control device for a composite heating cooker that applies automatic cooking in a microwave oven using a gas or temperature sensor to open cooking using heater heating, and can handle open cooking of any quantity.

[Prior art]

Conventionally, when using a composite heating cooker that has multiple heating means such as heaters and microwaves to function as an automatic oven cooker, the temperature and time for cooking various foods corresponding to the amounts specified in the attached cookbook are required. The data is stored in the internal memory of the microcomputer, and by operating the cooking menu key during open cooking, the temperature and time can be selected and set according to the amount of food to be cooked.

Open cooking was performed at this fixed time and temperature.

In addition, even during open cooking, the output of the gas or humidity sensor will fluctuate due to the gas emitted from the food being cooked, etc., but the fluctuation component is not limited to the gas emitted from the actual food being cooked. .

It may also be caused by gas generated from food residue adhering to the heater or heating chamber, but it is extremely difficult to distinguish between them, so sensor output fluctuations have not been applied to automatic cooking in open cooking. Therefore, the key.

There is a problem in that if the amount of cooked food deviates from the amount specified by the cooker, there will be too much or too little in one cooking.

[Summary of the invention]

This invention was made in order to solve the above-mentioned conventional problems.In addition to the gas or humidity sensor, food weight detection means is provided, and the food is irradiated with signals from this detection means and microwaves during open cooking for a short time. This is a composite heating cooker that automatically controls the heating time of food based on the signal detected by the sensor that temporarily generates gas from the food. Provides control equipment.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram showing a control device for a composite heating cooker according to the present invention, in which 1 is a heating chamber of the composite heating cooker, and a heater 29 is provided in the heating chamber 1 to store the weight of the food. A weight sensor 3 for detecting and a magnetron 4 for generating microwaves are respectively disposed, and a gas sensor 5 for detecting the gas concentration generated from the food heated by the heating means of the heater 2 and magnetron 4 is connected to the exhaust gas of the heating chamber 1. located within the section. 6 is an A/D converter that converts the detection signal from the food weight sensor 3 into a digital quantity; 7
is an A/D converter that converts the gas concentration detection signal from the gas sensor 5 into a digital quantity. 8 is A/
This is a detection unit that calculates and detects the gas concentration change rate detected by the gas sensor 5 based on the digital signal from the D conversion unit 7. 9 is a counter that counts the time from the start of cooking;
10 is a memory that stores predetermined processing data necessary for calculating the cooking time of food; 11 is a memory that stores the contents of the memory 10 and the above A/A;
A calculation unit that calculates the cooking time T of the food in the cooking chamber 1 based on the N amount data from the D converter 6, the gas concentration change rate data obtained from the detection unit 8, and the time data from the counter 9. , 12 is a heating control section that drives and controls the heater 2 and magnetron 4 based on commands from the calculation section 11.

FIG. 2 is an external view of the main body of the composite heating cooker equipped with the means shown in FIG. 1, and numeral 13 in FIG. 1 indicates an outer shell.

14 is a door for opening and closing the heating chamber 1; 15 is an input keyboard for the control system of the present invention; and 16 is an operation display section.

FIG. 3 shows a specific circuit diagram of the control device shown in FIG. Gas concentration change rate detection section 8 and counter 9゜Memo January O1 cooking time calculation section 11 is configured by a microcomputer 1. Performs necessary calculations by controlling and managing program memory, data memory, and input/output devices.

A CPU 18 that executes transfer processing, a ROM-configured memory 19 that stores processing programs, and a RAM-configured memory that stores arithmetic processing data and the like.

Input unit 21 that receives switch signals from the keyboard 15
, an input section n that performs A/D conversion processing on signals from the sensors 3 and 5, and an output section for the display section 16.

Power transformer 4a for driving the heater 2 and magnetron 4
It is comprised of an operation command output section for relays A to 4 which perform switching control of the power supply to the relays, and an output section 5 which outputs a control signal for timing the processing of the signal from the gas sensor 5. The weight sensor 3 is constructed by connecting a strain gauge 3& to a bridge.

A potential detection resistor is connected in series to the gas sensor 5 to pick up the input potential to the A/D converter, and this potential detection resistor also has a resistor for holding the peak value of the potential (sensor output signal). Transistor addition and capacitor 31
The series circuit of the transistor is connected in parallel, and the control signal from the output section 5 is applied to the base of the transistor.
1L is connected to a circuit connecting the AC power source to the heater 2 and magnetron drive power transformer 4a, and the switching contact 27a of the relay n can be switched to the line after the normally open contact 2811 to the heater 2 and the power transformer 4a. It is also connected to. The switching contact 26m of the relay is connected to the first and second heaters 2a constituting the heater 2.
, 2b and the line connecting the switching contact 27a.

Next, the operation of this embodiment configured as described above is illustrated in FIGS.
This will be explained with reference to FIG.

First, the food to be cooked is set in a predetermined position in the cooking chamber 1, and the keys on the keyboard 15 are operated to start cooking. Along with this, the microcomputer 17 is initialized.

The program stored in the memory 19 is started and executed according to the procedure shown in FIG. That is, at the same time as the cooking starts, the weight of the food set in the heating chamber 1 is detected by the sensor 3, and the detected lid is A/D converted and stored in the memory (step 40). At this time, the weight of the tare of the cake mold etc. has been corrected in advance. Further, the output of the gas sensor 5 is taken out as a change in the luminance level by a potential detection resistor, and the change is as shown in the curve shown in FIG. 5(a).

On the other hand, with the start of cooking, the process of energizing the magnetron and heater shown in step 41 is executed. That is, when an operation command is given to a part of the relay from the output die, it is energized and closes its normally open contact 28&. and relay 27
By intermittently giving operation commands to the switching contact 2'
7a is switched and connected alternately to the magneto drive power transformer 4a side and the heater 2 side at predetermined time intervals to supply electricity and heat the food. For example, before energizing the heater, the magnetron 4 is driven and microwaves are irradiated for 5 seconds.

Heat the food by energizing the heater 2 for 5 seconds. At this time, the timing of energizing the magnetron driving power transformer 4a and the heater is as shown in Fig. 5(c). Further, at the same time as the magnetron drive power transformer 4a is energized, a control signal is supplied to the transistor from the output section 5 at the timing shown in FIG. 5 (dl), and the transistor (
The capacitor 31 is made to conduct for a certain period of time set by the capacitance of the capacitor 31.

Note that which of the heaters 2m and 2b is to be driven is selected depending on the food to be cooked, and the selection is made by a portion of the relay.

As food heating by the magnetron and heater progresses, the program advances to the next step 42.

The signal detected by the gas sensor 5, ie, the potential of the potential detection resistor 4, is read through the input unit 22 every 0.5 seconds, and the process shown in the next step 43.44 is executed.

Step 43 is to calculate the rate of change α between the previously detected potential and the current potential detected 0.5 seconds later. This is done at the points plotted on the potential curve.Therefore, the potential change rate αT at 9 hours T is:

VT, −VT, −t αT, =□ ・・・・・・・・・・・・(1) However, 11 My, : Potential VT at time 'r, -
t: T, time (Lt waiting time 0.5 seconds) is determined from the previous potential.

In addition, the step material is used to determine whether the potential change rate α calculated in step 43 has become larger than a predetermined value A, for example 10%, and when α<A, the process returns to step 43. %, the starch and protein of the food in the heating chamber 1 changes, and components sensitive to the gas sensor gradually accumulate in the food or on its surface.

In this way, when the food reaches the final stage of cooking and a large amount of sensor-sensitive components have accumulated, when microwaves are irradiated from the hemagnetron 4, the inside of the food is rapidly heated, so that A large amount of water vapor, sensitive gas, etc. will be generated. That is, after the microwave is irradiated at time T as shown in FIG. 5(b), the potential changes rapidly as shown in FIG.
is obtained.

At this time, since a large amount of metallic gas is ejected, the output signal of the gas sensor becomes peak-like with ridges, and the timing of sensor signal processing may deviate from the peak output. Therefore, at the same time as the microwave irradiation, an on signal is applied from the output section 5 to the base of the transistor (material), and the transistor (9) is turned on for a certain period of time th as shown in FIG. 5 (C1). Current flows through the capacitor 31, charging the capacitor 31 to the true peak output value (see Figure 6 (bl)).Then, after the peak output VP+ has passed, the capacitor 31 is discharged.In this way, the peak output By retaining the value, the accuracy of the rate of change in the center position is improved.

In this way, the rate of change in potential α can be memorized for each menu.
10 (for example, 10%)
) The processes of steps 43 and 44 are repeatedly executed until the above is achieved. Then, the time when the determination result in step 44 becomes α>m is set as T (step 45).

That is, in step 45, the time from the start of food heating until it is determined that α>A is counted by the counting means (counter 9) built in the CPU.

This count value will be defined as time T1. This time T1 is determined by the type and quantity of the cooked food, and the relationship between the weight W and the time T1 is shown in FIGS. 7 and 8. FIG. 7 shows the functional characteristics of weight, and FIG. 8 shows the functional characteristics of time T.

Then, when the time T1 setting process shown in step 45 is completed, the process moves to step 46, and T2=TI
Execute the operation of 10K (T, Xw) X Tl,
Set the total cooking time T2 of the food currently being cooked.

Therefore, when 2 elapses in this cooking time, an off command is sent from the output unit of the microcomputer 17 to the relay 4, and the relay path is deenergized, thereby opening the contact 28a and the power transformer 4a for driving the heater 2 and the magnetron. Cut off the power to. As a result, the processing flow shown in FIG. 4 ends. Note that the function data of -K(TI)IK(T, )W is stored in the memory 10, and is sequentially read out from the memory 10 depending on the contents of T.

In this embodiment as described above, even if the amount of food to be cooked varies, it is possible to optimally cook the food and prevent over- or under-cooking.

〔Effect of the invention〕

According to the energization described above, sensor-sensitive components that are temporarily generated in large quantities from one food item are detected by irradiating microwaves for a short time during open cooking.

Since the cooking time is set using the rate of change in the sensitive component concentration at this time, it can be used for any type of food.
It can also be widely applied to cooking. In addition, the sensor-sensitive component is detected at the time when a temporary pulse-like peak output is generated after microwave irradiation.
The gas sensor can be used even during open cooking without being affected by interfering gases generated by food residue during open cooking. Furthermore, since the data from the weight sensor for one food item is taken into account as the cooking time setting information, even if the cooking amount changes from 1 serving to 5 servings, the finish of the cooking can be automatically adjusted. , allowing for highly precise open cooking.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a composite heating cooker according to the present invention, Fig. 2 is an external view of an open range body equipped with a control device of the present invention, and Fig. 3 is an electric circuit diagram of the control device according to the present invention. , FIG. 4 is a flowchart showing the signal processing procedure of the gas sensor and weight sensor in the invention, FIG. b) is a waveform diagram for explaining the operation in this invention. Figures 7 and 8 are food weight and time T in this invention.
, is a characteristic diagram showing the relationship between . 1... Heating chamber, 2... Heater, 3... Weight sensor, 4... Magnetron, 5... Gas sensor, 6.7
...A/D converter, 8...counter (counting means),
11... Total cooking time calculation section, 12... Heating control section,
17... Microcomputer, 29... Sensor potential detection resistor, 30... Transistor, 31... Capacitor. Note that the same reference numeral 1 in FIG. 1 indicates the same or the monk part. Agent Masuo Oiwa (2 others) Fig. 4 Fig. 5 C) Fig. 4 Fig. 7m 50 106' l Chiya Fig. 8

Claims (2)

[Claims] (1) a heating chamber, a heater heat source and magnetron that heat the food in the heating chamber, a gas sensor disposed in the heating chamber or the exhaust section, and a food weight sensor disposed in the food setting section in the heating chamber; means for alternately heating and controlling the heater heat source and magnetron at predetermined time intervals;
Means for calculating and detecting the gas concentration change rate every predetermined time from the output signal from the gas sensor, and means for counting the time T_1 from the start of heating until the gas concentration change rate detecting means detects a predetermined change rate level. Based on the time T_1 of the counting means, a time function K (
Composite heating characterized by comprising means for calculating and determining the time T_2 until the end of heating based on the data of T_1) and the data of the weight function K(T_1)(W) obtained based on the weight sensor. Cooker control device. (2) The gas concentration change rate detection means maintains the peak value of the level change for a certain period of time for gas components that are temporarily generated in large quantities after irradiating the food with microwaves and heating the food during cooking with the heater heating source, and performs microwave heating. 2. The control device for a composite heating cooker according to claim 1, further comprising a function of comparing the rate of change with a previous rate of change and determining whether or not the rate of change has reached a predetermined rate of change.