JPS63143426A - Cooker - Google Patents

Abstract

PURPOSE:To provide a cooker which enables execution of cooking with a normally stable and excellent finish state and has excellent reliability, by a method wherein the temperature of a gas sensor or therearound is detected by means of a temperature sensor, and a heating time is set by means of a constant being selected according to the detected temperature. CONSTITUTION:A temperature sensor 9 is situated in the vicinity of a gas sensor 8, while a constant beta responding to a detected temperature T from the temperature sensor 9 is calculated, and a heating is set by using the constant beta. Thus, cooking with a normally stable and excellent finish state is practicable irrespective of a change in characteristics of the gas sensor 7. This constitution enables sharp improvement in reliability.

Description

[Detailed description of the invention] [Object of the invention 1 (Industrial application field) The present invention relates to a cooking appliance equipped with a gas sensor.

(Prior art) Cooking devices, such as microwave ovens, use gas sensors to detect gases such as water vapor and smoke emitted from food, and automatically cook food as shown in Figure 4 in accordance with the output of the gas sensor. There is.

In other words, at the same time as the start of cooking, the output voltage Vs of the gas sensor
is monitored, and when the output voltage Vs changes by α·Vsmax after reaching the peak point VSIaX, the time to required up to that point is captured. Then, to is multiplied by a constant β, and β·to is set as the subsequent heating time. In other words,
When tk (-to+β·to) time has elapsed from the start of heating, cooking ends.

Note that the constants α and β are selected depending on the type of food and the content of cooking.

In addition, the peak point vsmax remains flat for a while after the start of cooking, but this is because the food to be cooked is wrapped for a while until the wrap comes off or tears.
This is because am gas is trapped.

However, as shown in FIG. 5, the gas sensor 7 has a problem in that its output characteristics change under the influence of ambient temperature.

That is, when the ambient temperature is low, such as in winter, the output voltage VS changes as shown by the solid line, and the time required for α·vsmax to change is tol. On the other hand, when the ambient temperature is low, such as in summer or immediately after cooking in an oven, the output voltage S changes as shown by the broken line,
The time required for α·Vssax to change is to2. This directly results in a difference in the quality of cooking.

(Problems to be solved by the invention) This invention was made in view of the above circumstances.
The purpose is to provide a highly reliable cooking device that is capable of consistently stable and well-done cooking without being affected by the surrounding temperature.

[Structure of the Invention] (Means for Solving the Problem) In a cooking appliance equipped with a gas sensor that detects gas emitted from food, a temperature sensor that detects the temperature of the gas sensor or its surroundings; means for setting the product of the time required up to that point and a constant β as the subsequent heating time when the change in the output reaches a predetermined value; and means for changing the constant β in accordance with the temperature detected by the temperature sensor. will be established.

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

Then, the heating time is set based on the selected constant β.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a heating chamber, and a shelf board 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 side wall of the heating chamber 1, and an antenna 3a of the magnetron 3 is introduced into the heating chamber 1.

Furthermore, an electric heater 4 for oven cooking is disposed in the upper part of the heating chamber 1. The magnetron 3 is connected to a commercial AC power source 5 via a high voltage transformer 5 and a relay contact 13a. Heater 4 is connected to power source 6 via relay contact 14a.

Further, an exhaust port 1 is formed in the upper part of the side wall of the heating chamber 1, and a gas sensor 8 is disposed outside the exhaust lower. moreover,
A temperature sensor 9 is provided near the gas sensor 8.

On the other hand, numeral 10 is a control section that performs overall control of the microwave oven, and is composed of a microcomputer and its peripheral circuits. Therefore, the control unit 10 includes an operation unit 11 and a display unit 1.
2, relays 13, 14, gas sensor 1, and temperature sensor 8 are connected.

Next, the operation of the above configuration will be explained with reference to FIGS. 2 and 3.

Food is placed on the shelf board 2 in the heating chamber 1, and the door of the heating chamber 1 is closed. Then, set microwave cooking on the operation unit 11,
and performs an operation to start cooking. 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 operates in oscillation. That is, high-frequency radio waves are irradiated into the heating chamber 1, and microwave cooking is started.

During microwave cooking, gas generated from food is exhausted to the outside through the exhaust lower. At this time, the exhaust gas is detected by the gas sensor 8.

The grave part 10 takes in the output voltage VS of the gas sensor 8,
After the output voltage Vs reaches the peak point Vsmax, α・v
When SIlax changes, the time required up to that point is taken in.

Furthermore, the control unit 10 takes in the detected temperature T of the temperature sensor 9, and sets the subsequent heating time β(T>・to using a constant β(T>) corresponding to the detected temperature T. Note that the constant β
(T) is a linear function according to the detected temperature T, and is calculated by the following formula.

β(T)−βO+−T (β0: constant, K: constant) However, when the ambient temperature is low as in winter, the temperature sensor 9
When the detected temperature is T1, the constant β(T1) is calculated, and the heating time thereafter is β(T1)
It becomes tol. Therefore, the total cooking time tkl is as follows.

tkl-toI+β(T1)・tol Also, when the ambient temperature is high and the temperature detected by the temperature sensor 9 is T2, such as in summer or immediately after cooking in the oven, the constant β(
T2) is calculated, and the heating time after that is β(T2)·to2 with respect to the time to required for α·Vsmax to change as shown in FIG. Therefore, the total cooking time tk
2 becomes as follows.

Then, the control unit 10 deenergizes the relay 13. In other words, the oscillation operation of the magnetron 3 is stopped, and the microwave cooking ends.

In addition, oven cooking and control part 1 due to heat generated by heater 4
0 takes in the temperature detected by the temperature sensor 9 as the heating chamber temperature and controls the energization of the heater 4.

In this way, the temperature sensor 9 is provided near the gas sensor 8, and the constant β(T) is determined according to the detected temperature T of the temperature sensor 9.
Since the constant β(T) is used to set the heating time, stable and well-done cooking can always be achieved regardless of changes in the characteristics of the gas sensor 7 due to the ambient temperature. . Therefore, reliability can be significantly improved. Moreover, since the temperature sensor 9 is also used as a concentration sensor in the heating chamber for oven cooking, it is effective in terms of cost.

In the above embodiment, the case where the food is wrapped is exemplified as the output change of the gas sensor, but the same effect can be obtained even when the food is not wrapped. In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist.

[Effects of the Invention] As described above, according to the present invention, the temperature sensor that detects the temperature of the gas sensor or its surroundings, and the
When the change in the output of the gas sensor reaches a predetermined value, means for setting the product of the time required up to that point and a constant β as the subsequent heating time; and means for changing the constant β in accordance with the temperature detected by the temperature sensor. Therefore, it is possible to provide a highly reliable cooking device that can always cook food with good quality and stability without being affected by the ambient temperature.

[BRIEF DESCRIPTION OF THE 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 embodiment, and FIGS. The figure is a diagram for explaining the operation of a conventional microwave oven. DESCRIPTION OF SYMBOLS 1... Heating chamber, 3... Magnetron, 8... Gas sensor, 9... Temperature sensor, 10... Control part. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Q tO+
Axis 1 hour -・-・ Fig. 2 Oto2tK2 time -11111-

Claims (2)

[Claims] (1) In a cooking appliance equipped with a gas sensor that detects gas emitted from food, a temperature sensor that detects the temperature of the gas sensor or its surroundings is installed, and when a change in the output of the gas sensor reaches a predetermined value during cooking, A cooking appliance characterized by comprising: means for setting the product of the time required up to this point and a constant β as the subsequent heating time; and means for changing the constant β in accordance with the temperature detected by the temperature sensor. (2) The cooking appliance according to claim 1, wherein the temperature sensor is also used as a heating chamber temperature sensor during oven cooking.