JPH0833206B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a cooking device provided with a gas sensor.

(Prior Art) In a cooker such as a microwave oven, a gas sensor detects gases such as steam and smoke emitted from food, and automatic cooking as shown in FIG. 4 is performed according to the output of the gas sensor. There is.

That is, at the same time when cooking is started, the output voltage Vs of the gas sensor
To monitor. The output voltage Vs gradually increases, and when it reaches its peak, it gradually decreases. Then, when the output voltage Vs reaches a peak, the peak value Vs max is multiplied by a constant α to obtain a predetermined value α · Vs max. Then, when the output voltage Vs drops to this predetermined value α · Vs max,
Take in the time to start from the start of cooking. Then, to is multiplied by a constant β, and β · to is set as the subsequent heating time. That is, when tk (= to + β · to) time has elapsed from the start of heating, the cooking ends there.

The constants α and β are selected according to the type of food and the content of cooking.

By the way, the gas sensor has a problem that the output characteristics change under the influence of ambient temperature, as shown in FIG.

That is, when the ambient temperature is low as in winter, the output voltage Vs changes as shown by the solid line, and the time required to change α · Vs max is to ₁ . On the other hand, when the ambient temperature is high, such as in summer or immediately after cooking in the oven, the output voltage Vs changes as shown by the broken line, and the time required to change α · Vs max is to ₂ . This appears as a difference in the quality of cooking as it is.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to always prepare food with stable and good quality without being affected by ambient temperature. It is to provide a highly reliable cooker that enables

[Structure of the Invention] (Means for Solving Problems) In a cooking device provided with a gas sensor for cooking food by high-frequency radio waves and detecting gas emitted from the food, a temperature sensor for detecting temperature around the cooking device During cooking, when the output change of the gas sensor reaches a peak and then the output of the gas sensor drops to a predetermined value obtained by multiplying the peak value by a constant α, the time required from the start of cooking to the Means for setting the product of the constant β as the subsequent heating time and means for changing the constant β in accordance with the temperature detected by the temperature sensor are provided.

(Operation) The temperature of the gas sensor or its surroundings is detected by the temperature sensor, and the constant α is selected according to the detected temperature.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a heating chamber, and a shelf 2 for placing food is provided at the bottom of the heating chamber 1. A magnetron 3 which is a high frequency generator is attached to the upper part of the side wall of the heating chamber 1, and the antenna 3a of the magnetron 3 is introduced into the heating chamber 1. Further, an electric heater 4 for oven cooking is arranged in the upper part of the heating chamber 1. And
The magnetron 3 is a high voltage transformer 5 and relay contacts 13a.
Is connected to the commercial AC power supply 5 via. The heater 4 is connected to the power source 6 via the relay contact 14a.

An exhaust port 7 is formed on the upper side wall of the heating chamber 1, and a gas sensor 8 is arranged outside the exhaust port 7. Further, a temperature sensor 9 is provided near the gas sensor 8.
The temperature sensor 9 is provided at the exhaust port 7 that communicates with the outside air, and can detect the ambient temperature of the cooker.

On the other hand, 10 is a control unit for controlling the entire microwave oven, which includes a microcomputer and its peripheral circuits. Then, the operation unit 11, the display unit 12, the relays 13 and 14, the gas sensor 7, and the temperature sensor 8 are connected to the control unit 10.

Next, FIG. 2 and FIG.
The operation will be described with reference to the drawings.

The food is placed on the shelf 2 in the heating chamber 1, and the door of the heating chamber 1 is closed. Then, set range cooking with the operation unit 11,
And start the cooking operation. Then, the control unit 10 energizes the relay 13. When the relay 13 is energized, the contact 13a is turned on and the magnetron 3 oscillates. That is, high frequency radio waves are radiated into the heating chamber 1 to start range cooking.

When cooking this range, the gas generated from the food is exhausted 7
Is discharged to the outside through. At this time, the exhaust gas is detected by the gas sensor 8. The output voltage Vs gradually increases, and when it reaches its peak, it gradually decreases.

The control unit 10 takes in the output voltage Vs of the gas sensor 8 and, when the output voltage Vs reaches a peak, multiplies the peak value Vs max by a constant α to obtain a predetermined value α · Vs max. Then, when the output voltage Vs drops to the predetermined value α · Vs max, the time to required from the start of cooking to the present is taken in. Then, to is multiplied by a constant β, and β · to is set as the subsequent heating time.

However, the control unit 10 takes in the detected temperature T of the temperature sensor 9 and changes the constant α according to the detected temperature T. That is, the constant α (T) corresponding to the detected temperature T is selected. This constant α (T) is a linear function and is calculated by the following equation.

α (T) = αo + K · T Note that αo and K are constants and correspond to the type of food and the cooking content.

Therefore, when the ambient temperature is low and the temperature detected by the temperature sensor 9 is T ₁ as in winter, the constant α (T ₁ ) is calculated, and α (T ₁ ) · Vs max changes as shown in FIG. The total cooking time tk ₁ is determined by the time to ₁ required up to and the heating time β · to ₁ thereafter.

tk ₁ = to ₁ + β · to _{1 When the} ambient temperature is high and the temperature detected by the temperature sensor 9 is T _{2 as} in the summer or immediately after oven cooking, the constant α
(T ₂ ) is calculated, time to ₂ required for α (T ₂ ) · Vs max to change as shown in FIG. 3, and heating time β thereafter.
・ To ₂ determines total cooking time tk ₂ .

tk ₂ = to ₂ + β · to _{2 When the} cooking end timing Tk ₁ or Tk ₂ comes, the control unit 10
Deactivates relay 13. That is, the oscillating operation of the magnetron 3 is stopped, and the range cooking is completed.

In this way, the temperature sensor 9 is provided in the vicinity of the gas sensor 8, and the constant α corresponding to the temperature T detected by the temperature sensor 9 is set.
Since (T) is calculated and the heating time is set using the constant α (T), regardless of the characteristic change of the gas sensor 7 due to the ambient temperature, there is no excessive heating or insufficient heating, and it is always stable and good. It is possible to cook in a good condition. Therefore, the reliability can be significantly improved.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

[Effects of the Invention] As described above, according to the present invention, food is cooked by high-frequency radio waves, and in a cooker equipped with a gas sensor that detects gas emitted from the food, the temperature around the cooker is detected. When the temperature sensor and the rise in the output of the gas sensor at the time of cooking peak during cooking, and then the output of the gas sensor drops to a predetermined value obtained by multiplying the peak value by a constant α, it took until the start of cooking. Since the means for setting the product of time and the constant β as the subsequent heating time and the means for changing the constant α according to the temperature detected by the temperature sensor are provided, when cooking food by only high frequency radio waves, It is possible to provide a highly reliable cooker that enables stable and stable cooking without being affected by ambient temperature.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIGS. 2 and 3 are diagrams for explaining the operation of the same embodiment, and FIGS. 4 and 5 are conventional microwave ovens, respectively. FIG. 6 is a diagram for explaining the action of FIG. 1 ... Heating chamber, 3 ... Magnetron, 8 ... Gas sensor, 9 ... Temperature sensor, 10 ... Control section.

Claims (1)

[Claims] 1. Cooking food with high frequency radio waves,
In a cooker equipped with a gas sensor that detects the gas emitted from food, a temperature sensor that detects the temperature around the cooker, and during cooking, the output change of the gas sensor reaches the peak The peak value has a constant α
When it is lowered to a predetermined value by multiplying by, means for setting the product of the time required from the start of cooking to the constant β as the subsequent heating time, and the constant α is changed according to the temperature detected by the temperature sensor. A cooking device comprising means.