JPH04257623A - Heating and cooking oven - Google Patents

Abstract

PURPOSE:To properly heat an object to be heated regardless of the preserving temperature of the object. CONSTITUTION:A gas sensor 6 detects steam, etc., generated by a piece of toast in a heating chamber 1. When an automatic toasting key 9 is manipulated, a microcomputer 8 turns on a relay switch 4 corresponding to the temperature in the heating chamber 1 to energize an electric heater 3. When the toast is heated for a set time period, the microcomputer 8 decides the succeeding energizing time period of the heater 3 according to the detected result of the gas sensor 6.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooking apparatus that performs heating cooking using an electric heater based on the detection state of a gas sensor.

0003

2. Description of the Related Art Hitherto, for example, oven grill ranges have been provided with an automatic toasting function. In other words, it is equipped with a timer for setting the time period for which electricity is applied to the electric heater that heats the interior of the refrigerator, and the electric heater is energized by the timer operation by operating the automatic toast key. In this case, since the electric heater is cut off after the timer setting time has elapsed, the degree of baking of the bread can be adjusted by adjusting the timer setting time.

By the way, in ordinary households, bread is stored in a freezer to extend its shelf life. When baking bread that has been frozen (approximately 0℃) in this way, it should be stored at room temperature (approximately 20℃).
It is necessary to set the timer time longer than the appropriate time to bake the bread. For this reason, recent oven grill ranges are equipped with a frozen toast key that is operated when baking bread that has been stored in the freezer, and a room temperature toast key that is operated when baking bread that has been stored at room temperature. When the room temperature toast key is pressed, the electric heater is energized for a longer period of time than when the room temperature toast key is pressed.

[0005]

However, in the case of the conventional configuration described above, if the frozen toast key and the room temperature toast key are operated incorrectly, the bread stored in the freezer will be under-baked, and the bread stored at room temperature will be over-baked. There is a disadvantage that it occurs.

The present invention has been made in view of the above circumstances, and its purpose is to provide a heating cooking device that can appropriately heat and cook an object to be heated, regardless of the storage temperature of the object. be.

[Configuration of the invention]

[0008]

[Means for Solving the Problems] The heating cooking device of the present invention includes an electric heater that heats an object to be heated stored in a heating chamber, and a gas sensor that detects water vapor etc. emitted from the object to be heated. , in a heating cooking apparatus that controls energization of the electric heater based on a detection state of the gas sensor, while waiting for a set time in response to an instruction to start cooking;
The apparatus is provided with a control means that determines the energization time to the electric heater based on the detection state of the gas sensor after the set time has elapsed.

[0009]

[Operation] Instructs to start cooking with the object to be heated stored in the heating chamber. Then, the control means waits for a set time, and if the object to be heated is stored at room temperature, water vapor or the like is emitted from the surface of the object in a relatively short time. Additionally, if the object to be heated has been stored frozen, the temperature of the object to be heated will only rise relatively slowly during the above-mentioned waiting period, and water vapor, etc. of the object to be heated will be emitted in a short period of time. There isn't.

[0010] Accordingly, the control means can determine the storage state of the object to be heated based on the detection state of the gas sensor after a set time has elapsed, and determines the energization time to the electric heater based on the result of the determination. Therefore, the object to be heated can be properly heated and cooked regardless of the storage temperature.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an oven grill range equipped with an automatic toasting function will be described below with reference to the drawings.

FIG. 1 schematically shows the overall configuration.
A mounting plate 2 is disposed within the heating chamber 1. An electric heater 3 is disposed above the heating chamber 1, and is connected to a commercial AC power source 5 via a relay switch 4.

A gas sensor 6 and an oven sensor 7 are disposed within the heating chamber 1. The gas sensor 6 detects water vapor or the like in the heating chamber 1 and outputs a gas detection signal Va. The oven sensor 7 detects the temperature inside the heating chamber 1 and outputs a temperature detection signal Vb.

The microcomputer 8 serving as the control means is a C
It is mainly composed of a PU, and uses a commercial AC power supply 5 as its power source.

The microcomputer 8 inputs the gas detection signal Va from the gas sensor 6 and the temperature detection signal Vb from the oven sensor 7, and receives these detection signals Va.
and Vb, the relay switch 4 is turned on and off. In addition, the microcomputer 8 also has an automatic toast key 9.
When the automatic toast key 9 is turned on, heating cooking is performed. The microcomputer 8 is connected to a liquid crystal display 10, and displays the current time or the time until the end of cooking on the liquid crystal display 10 as appropriate.

FIG. 2 shows the electrical connection relationship between the microcomputer 8 and the gas sensor 6. In Figure 2,
The output terminal of the microcomputer 8 is connected to a plurality of load resistors 11, 12, 13, and 14 having different resistance values. These load resistors 11, 12, 13, and 14 are grounded via a resistive portion 6a of the gas sensor 6. The input terminal of the microcomputer 8 is connected to the resistance section 6a of the gas sensor 6.
is connected to the gas detection signal V from the gas sensor 6.
It is now possible to input a. This gas sensor 6 is equipped with an electric heater 6b, and the gas sensor 6 functions when the resistance portion 6b is heated by the heat generated by the electric heater 6b.

Next, the operation of the above configuration will be explained. In the flowchart of FIG. 3 showing the operation of the microcomputer 8, the microcomputer 8 performs step S1.
Waits until the signal level of the gas detection signal Va from the gas sensor 6 becomes stable. Then, when the signal level of the gas detection signal Va becomes stable, the microcomputer 8 proceeds to step S2 and sequentially energizes the load resistors 11, 12, 13, and 14. Then, the load resistor with high sensitivity of the gas sensor 6 is kept energized (see FIG. 4).

When the automatic toast key 9 is operated (step S3), the microcomputer 8 operates the automatic toast function. That is, the temperature detection signal Vb from the oven sensor 7 is input to measure the temperature inside the heating chamber 1 (step S4). If the temperature inside the heating chamber 1 is 10°C or lower, the process proceeds to step S6, where the relay switch 4 is turned on, and then the process proceeds to step S7; if the temperature is 10°C or higher, the process proceeds to step S7. do.

Subsequently, the microcomputer 8 waits for the set time T in step S7 (
4), the gas detection signal Va is input from the gas sensor 6 (step S8), and the gas detection signal V
It is determined whether or not a has exceeded the set level VL. At this time, since frozen toast is placed on the placing tray 2, if the temperature in the heating chamber 1 is 10°C or higher when the automatic toast key 9 is operated, or if the automatic toast key 9 is When the inside of the heating chamber 1 is heated by the heat generated by the electric heater 3 due to the operation, the temperature of the frozen toast rises relatively gently. Therefore, since it takes a relatively long time after the automatic toast key 9 is operated for water vapor etc. to be emitted from the frozen toast, almost no water vapor etc. is emitted from the frozen toast by the time the set time T has elapsed. As a result, the signal level of the gas detection signal Va from the gas sensor 6 remains unchanged from the beginning of cooking and exceeds the set level VL (see FIG. 4). Therefore, the microcomputer 8 determines that the object to be heated is frozen toast, selects the energization time T1 (step S10), and then switches the relay switch 4 for the energization time T1.
is turned on to energize the electric heater 3 (step S11).
.

Now, when heating room temperature toast stored at room temperature, when heat is applied to room temperature toast as described above, room temperature toast is directly heated and steam etc. are generated in a relatively short period of time. Steam etc. are emitted from the room temperature toast within a short time after the cooking instruction is given. In this case, at the timing when the set time T has elapsed from the start of toasting, the signal level of the gas detection signal Va from the gas sensor 6 becomes lower than the set level VL. Therefore,
The microcomputer 8 determines that the object to be heated is toast at room temperature, selects the energization time T2 (step S12), and then turns on the relay switch 4 for the energization time T2 to energize the electric heater 3 (step S12). S11
).

In short, in the case of the above embodiment, the microcomputer 8 waits until a set time has elapsed when the automatic toast key 9 is operated, and performs toasting based on the detection state of the gas sensor 6 after the set time has elapsed. The energization time of the electric heater 3 is determined by determining the heating temperature of the heater 3, so unlike the conventional example where you have to select either the frozen toast key or the room temperature toast key, you can toast without accidentally operating the toast key. can be baked properly.

[0022] In the above embodiment, an example of toasting was shown, but the present invention may be configured to be applied to heating frozen foods and foods stored at room temperature.

[0023]

As is clear from the above description, according to the heating cooking apparatus of the present invention, when an instruction to start cooking is given, the control device waits for a set time, and the gas sensor is activated after the set time has elapsed. Since the time for energizing the electric heater is determined based on the detected state, an excellent effect is achieved in that the object to be heated can be appropriately heated and cooked regardless of the storage temperature of the object.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic configuration diagram showing one embodiment of the present invention.

[Figure 2] Electrical circuit diagram showing the connection between the gas sensor and microcomputer

[Figure 3] Flowchart showing the operation of the microcomputer

[Figure 4] Signal waveform diagram of gas detection signal

[Explanation of symbols]

1 is a heating chamber, 3 is an electric heater, 6 is a gas sensor, and 8 is a microcomputer (control means).

Claims (1)

[Claims] 1. An electric heater that heats an object to be heated housed in a heating chamber, and a gas sensor that detects water vapor or the like emitted from the object to be heated, wherein the electric heater A heating cooking apparatus that controls energization of the electric heater, comprising a control means that waits for a set time upon instruction to start cooking, and determines the time of energization of the electric heater based on a detection state of the gas sensor after the set time has elapsed. A heating cooking device characterized by: