JPS627454B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sensor microwave oven that automatically controls high-frequency heating according to a cooking menu, and more specifically, the invention relates to a sensor microwave oven that automatically controls high-frequency heating according to a cooking menu determined by the food stored in the sensor microwave oven. The purpose is to determine whether or not an operation key is selected correctly and whether or not the correct treatment is applied to a cooked product.

Sensor microwave ovens that automatically control high-frequency heating according to the cooking menu using humidity sensors, gas sensors, etc. are becoming popular. , side dishes,""warming 3, sake can,""preparation 1, leafy vegetables,""preparation 2, root vegetables," and other automatic cooking keys are provided (see Figure 1).

Therefore, it is possible to store correctly processed cooked products (for example, in the case of preparing leafy vegetables and root vegetables, put them in a plastic wrapper, and in the case of boiling sake, put the sake in a pot) in the oven chamber of the sensor microwave oven, and then store the cooked products in the oven compartment. By operating the automatic cooking key in accordance with the timing, high-frequency heating can be automatically controlled and proper heating cooking can be performed.

When a person who is accustomed to using a sensor microwave oven operates a sensor microwave oven, it is unlikely that he or she will mishandle the cooked food or operate the automatic cooking key incorrectly, but a person who is inexperienced in using the sensor oven There are many cases where the microwave oven must be operated, and in this case, the user may mishandle the food or operate the automatic cooking key incorrectly, resulting in the inconvenience of not being able to cook properly.

For example, if you store spinach in the oven compartment of a sensor microwave oven without wrapping it and operate the automatic cooking key for "Preparation 1, Leafy Vegetables," the gas and moisture will be removed from the spinach as soon as you start cooking. occurs and changes the output voltage of the sensor, and compared to normal cooking, the output voltage of the sensor reaches the detection level more quickly and high-frequency heating stops in an unheated state. (See the solid line in Figure 3, and the dashed line in the figure shows normal cooking.) Also, since cooking is done without wrapping at all, all the moisture comes out and the food becomes dry. There is also the inconvenience of not being able to eat it.

When rice is stored in the oven and the automatic cooking key for "Warming 3, Sake Can" is operated, the output voltage of the sensor will change as shown in the solid line in Figure 4, so the rice will continue to be heated. Even if it reaches a boiling state, it does not reach the detection level for sake sake, resulting in the inconvenience that high-frequency heating continues.

If a pot filled with sake is stored in the oven and the automatic cooking key for "Preparation 1, Leafy Vegetables" is operated, the output voltage of the sensor will reach the preparation detection level in a very short time after high-frequency heating starts. Therefore, the time required for high-frequency heating is shortened, resulting in the inconvenience that the sake cannot be heated at all (see Figure 5).

The present invention detects the rate of change in the output voltage of a sensor during high-frequency heating, determines the type of food in the oven, and selects and operates the correct automatic cooking key for the type of food. The above-mentioned inconvenience is solved by determining whether or not the user is present, and will be described in detail below with reference to the accompanying drawings showing embodiments.

Figure 1 is a front view of the operation panel of the sensor microwave oven, showing the cooking start key 1 and gas sensor 5.
It has automatic cooking keys 2, 2, . . . for automatic control based on the output voltage, timer heating setting keys 3, 3, .

Figure 2 is an electrical wiring diagram of the sensor microwave oven, and there is a relay contact Ra between the terminals of the commercial AC power supply AC.
A high frequency heating means 6 consisting of a magnetron or the like is connected in series.

In addition, the output signal of the gas sensor 5 is transferred to the A/D converter 7.
and via interface unit 8
At the same time, the key output signal from the operation panel is applied to the microcomputer 9 via the interface unit 8, and the output signal from the microcomputer 9 is sent to the interface unit. Switching transistor through 8
A relay coil R for driving the high frequency heating means is connected in series with the switching transistor Tr.

The operation of the sensor microwave oven having the above configuration is as follows.

After opening the door (not shown) of the sensor microwave oven, storing the cooked food in the oven, and closing the door, one of the automatic cooking keys 2 is selected and operated.

At this time, the output signal of the operation panel corresponding to the automatic cooking key 2 selected and operated is applied to the microcomputer 9 via the interface unit 8, and the name of the automatic cooking key 2 selected and operated is input.
Store in RAM.

Next, by operating the cooking start key 1, the relay contact Ra is closed and the high frequency heating means 6 is driven to heat the cooked food at high frequency.

And after the start of high frequency heating, time T ₁ and time T ₂
The output voltage V _T1 of the gas sensor 5 during the elapsed time,
V _T2 is memorized, the ratio V _T2 /V _T1 of both output voltages is determined, and it is determined whether the ratio V _T2 /V _T1 is less than 0.9, 0.9 or more and less than 0.95, or 0.95 or more and less than 1.0.

The reason why the ratio V _T2 /V _T1 is determined here is as follows.

In other words, when alcohol is heated with high frequency, gas is generated as it is heated, and the output signal level of the gas sensor decreases at a relatively low temperature. At low temperatures, almost no gas is generated, but when the temperature of leafy and root vegetables rises to around 100℃, gas is suddenly generated along with water vapor, and the output signal level of the gas sensor decreases, causing the side dishes to be heated at high frequency. In this case, a smaller amount of gas is generated during heating than when making sake sake, and the output signal level of the gas sensor decreases at a relatively low temperature (however, the output signal level of the gas sensor decreases less than when making sake sake). ) (see Fig. 6), the type of food stored in the oven can be determined by determining the ratio V _T2 /V _T1 . For example, the ratio V _T2 /V _T1
If it is less than 0.9, there is sake in the pot in the oven, if it is 0.9 or more and less than 0.95, there is a side dish in the oven, and if it is 0.95 or more and less than 1.0, there is sake in the oven for preparation. You can know that there are leaf vegetables or root vegetables that have been wrapped.

Therefore, if the ratio V _T2 /V _T1 is less than 0.9, there is sake in the pot in the oven, so the selected and operated automatic cooking key 2 is "Warm up 3, sake can".
The ratio V _T2 /V _T1 is 0.9 or more.
If it is less than 0.95, there is a side dish in the oven, so it is determined whether the selected and operated automatic cooking key 2 is "Warming 2, side dish", and the ratio V _T2 /V is determined.
If _T1 is 0.95 or more and less than 1.0, there are leafy vegetables or root vegetables in the oven that have been coated for preparation, so the selected and operated automatic cooking key 2 is "Preparation 1, Leafy Vegetables" or "Preparation 2," It is determined whether or not it is a root vegetable.

Then, the automatic cooking key 2 is activated accurately in response to the food in the oven determined by the ratio V _T2 /V _T1 .
is selected, high-frequency heating is performed until the detection level V _S predetermined by the cooking menu matches the output signal level of the gas sensor 5, and then the relay contact Ra is turned OFF and the high-frequency heating means 6 is turned off. to complete heating and cooking.

If automatic cooking key 2 is not selected correctly according to the food in the oven determined by the ratio V _T2 /V _T1 , high frequency heating cannot be automatically controlled accurately, so it is likely that the key is used incorrectly. After determining and displaying “ERROR”, close relay contact Ra.
The high frequency heating means 6 is turned OFF and the heating cooking is interrupted.

Even if automatic control cooking is performed incorrectly, cooking failure can be prevented.

Moreover, it is also possible to use a humidity sensor instead of a gas sensor.

As described above, the present invention enables automatic heating cooking (so-called "automatic heating") in a sensor microwave oven to be performed accurately and reliably, and in the case of misuse, it is possible to notify the user of the misuse. It has a unique effect.

[Brief explanation of the drawing]

Figure 1 is a front view of the operation panel of the sensor microwave oven, Figure 2 is the electrical wiring diagram of the sensor microwave oven, and Figures 3 to 5 show the relationship between the output voltage of the gas sensor and the cooking time in case of misuse. Figure 6 is a diagram showing the relationship between the output voltage of the gas sensor and heating cooking time when preparing food, side dishes, and sake sake. Figure 7 is a flowchart showing the operation of the sensor microwave oven. . 2... Automatic cooking key, 4... Display section, 5... Gas sensor, 6... High frequency heating means, 9... Microcomputer, Tr... Switching transistor, R... Relay coil, Ra... Relay contact .

Claims (1)

[Claims] 1. In a microwave oven equipped with high-frequency heating means and a sensor that detects the concentration of gas emitted from the cooked food in the oven, the rate of change in the output voltage of the sensor after a predetermined period of time after starting high-frequency heating cooking is used to detect the cooked food. a plurality of operation keys for specifying the menu to be cooked by automatic control, a storage means for storing the rate of change in correspondence with the menu, and an operation key pressed by the user. Compare the stored value of the storage means corresponding to the output change rate from the sensor,
A sensor microwave oven characterized by comprising a control means capable of stopping high-frequency heating and alerting of misuse when the two values differ beyond a permissible range.