JPH0762528B2 - Heating device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automation of heating and cooking by using an atmosphere sensor and a weight sensor to monitor how to generate water vapor or gas from an object to be heated and to heat the object to be heated. The present invention relates to a heating device realized by detecting the weight of the.

Conventional technology With regard to automatic heating and cooking of objects to be heated, which has been performed conventionally, the state of water vapor or gas that comes out of the object to be heated is detected according to the heating condition of the object to be heated, and the state before heating or starting of heating is started. After that, the heating was stopped or the heating means was changed by comparing the states after a certain period of time (Japanese Patent Publication No. Sho 55-84121, Japanese Patent Publication No. 58-18035). These cookers have the following problems.

Problems to be Solved by the Invention As a reference value of the heating state to be compared with the heating state of the object to be heated detected by the atmosphere sensor during heating, the state before heating or the state after a fixed time from the start of heating are stored. There is. Then, by comparing the stored contents with the heating state during heating, the heating capacity is switched, the heating is stopped, or the heating means is switched. However, since the setting of the standard value is a fixed condition in this way, automatic heating cooking is realized by providing selection keys for the automatic heating menu according to the type of food, or by using a heating means that is implemented only for specific menus. Was there. However, since the heating menu keys of the operation unit are divided according to the type of food and the heating menu keys according to the specific food menu are provided in this way, the number of keys on the operation unit only increases, and when the keys are used incorrectly There is a problem that the area of the menu selection key of the operation unit becomes large when is pressed.

For example, in Japanese Examined Patent Publication No. Sho 55-84121, a gas cooker that detects alcohol is used to realize a cooking device that can automatically adjust the temperature of the sake liquor. It can be adopted.
In Japanese Patent Publication No. 58-18035, heating control for discriminating the type of food is performed only when the grill is heated, and can be used only when the grill is heated.
That is, there is a problem in that a menu key is provided, which is a selection menu key for limiting the heating menu. Furthermore, since these patents use the sensor signal before heating or the sensor output after a certain time after heating as a reference for comparison, the food is heated under limited environmental initial conditions or stable atmospheric conditions. There was a problem that had to be.

The present invention is to solve such a problem, by using an atmosphere sensor for detecting the water vapor concentration and a weight sensor for detecting the weight of food, the type quantity of food is determined when heating is continued, and heating is stopped. The timing of is to provide a heating device that switches a heating capacity or a heating means and realizes a large number of foods / amounts with a small heating menu selection key.

Means for Solving the Problems A heating device of the present invention includes a heating chamber that stores an object to be heated, a heating unit that is provided in the heating chamber, a control unit that controls power supply to the heating unit, and an object to be heated. An atmosphere sensor that detects water vapor or gas generated from a heated object, and a weight sensor that weighs the weight of food are provided, and the control unit detects the heated object detected by the weight sensor when starting heating of the heated object. During the food discrimination time set according to the weight, it is determined whether or not the detection signal of the atmosphere sensor has reached a preset predetermined value, and the type of the heated object is determined, and the determined heated object is determined. The heating means is controlled according to the type.

Operation The heating device of the present invention differs in the timing at which water vapor or gas comes out from the food to be heated, such as steam or gas, depending on the type of food to be heated, even if the weight of food is about the same. Through repeated experiments, based on the results of this experiment, the heating time Tw is set according to the weight of the object to be heated detected when heating the object to be heated.
By then, it is discriminated whether or not a preset amount of water vapor or gas comes out from the food heated object, or not, and the kind of food heated object is selected. As a result, the heating means is selected according to the type of food to be heated, and the method of supplying power to the heating means is controlled.A heating method suitable for the food is adopted during heating, and it should be performed. It is the one.

Example A heating apparatus according to an example of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of the main body of the heating device according to the present invention.
A door body 2 is pivotally supported on the front surface of the main body 1 so as to be openable and closable, and an operation panel 3 is provided. An automatic heating and cooking selection key 4 is arranged on the operation panel 3.

FIG. 1 is a block diagram showing the configuration of such a heating device. The heating command input from the automatic heating and cooking selection key 4 is decoded by the control unit 5. The control unit 5 then
Detection circuit for measuring the weight of the object to be heated 7 using the weight sensor 10
The control unit 5 is notified via 15 to calculate and set the time Tw based on this weight value. Further, the control unit 5 monitors the state of water vapor or gas emitted from the object to be heated 7 by the atmosphere sensor 12 and determines how much the object to be heated is heated based on the signal transmitted via the detection circuit 15. Further control unit 5
Controls power supply to the magnetron 9 as a heating source or the heater 17 via the driver 8 to perform continuous heating, intermittent heating, or switching of heating means.

By placing the object to be heated 7 on the mounting table 11 of the heating chamber 6, the object to be heated is heated by the Tw time calculated based on the weight of the object to be heated 7 transmitted from the weight sensor 10 to the control unit 5. By determining whether the amount of water vapor or gas that comes out reaches a predetermined amount, the heating means or heating method after Tw time is selected.

By the time Tw, the predetermined amount of water vapor is
The first heating procedure is performed when the temperature rises from the above, and the second heating procedure is performed when the predetermined amount of water vapor does not come out of the article to be heated 7 by the time Tw. The operation sequence flowchart for performing these heatings will be described with reference to FIG.

First, the processing at the start of the heating of the V _max, such as placing to watch A or to measure the weight of the food or the start of the heating of the food after the start in the W, the state of the initial humidity Toka gas. Subsequently, in B, the food discrimination time Tw is calculated based on the food weight W. And
At D, the state detection such as the state of the humidity and gas emitted from the food when the heating is continued, V, and the state of T for observing how long the heating time has elapsed are performed. Then, in E, whether or not to move to the next operation is selected depending on whether or not the elapsed heating time is Tw.
It returns to the operation branch point of C until the Tw time is reached, and repeats the operation of D. Then, when the time Tw has passed at F, it is observed whether the state of water vapor or gas from the food has changed by Δh level compared to the initial heating (V _max −V ≧ Δh). If there is no change in the sensor signal of Δh in G, the first heating procedure is performed, and if there is no change in the sensor signal of Δh, the second heating procedure is performed in H.

In the embodiment of the present invention, the food to be subjected to the first heating procedure corresponds to cold rice, miso soup or yakisoba as food to be reheated. On the other hand, as foods to be subjected to the second heating procedure, frozen foods, frozen meat dango, frozen curry, etc. are targeted as frozen foods that can be eaten as they are. That is, in the first heating procedure, the reheated food is constituted and in the second heating procedure, the thawed reheated food is constituted by a heating sequence for bringing the food into a favorable heating state.
Here, the relationship between the Tw time and the food weight for discriminating these foods will be described with reference to FIG.

In FIG. 4, the horizontal axis is the food weight W, and the vertical axis is the time T from the individual food until a predetermined amount of water vapor or gas comes out. Then, Tw =, which indicates the time to determine the type of food
With the weight function of A * W + B (A and B are constants) as the boundary, there are cold foods such as cold rice, miso soup, and yakisoba as the foods that produce a predetermined amount of water vapor by Tw. Frozen foods such as frozen rice, frozen meat dango, and frozen curry are foods that do not release a certain amount of water vapor after the Tw time.

As described above, the present invention is configured to perform the first heating procedure or the second heating procedure depending on whether a predetermined amount of water vapor or gas comes out from the food by Tw time. However, as the first heating procedure, the heating sequence of re-warming the cooled food is performed, and as the second heating procedure, the heating sequence of thawing and re-heating the frozen food is performed.
FIG. 5 shows these heating sequences. The upper half of FIG. 5 shows the sequence (a) of performing heating as the first heating procedure, and the lower half shows the thawing and reheating as the second heating procedure. It is a heating sequence (b) for performing. In the warming heating sequence (a) as the first heating procedure, the food weight W
Since the sensor signal changes from the initial level V _max to the Δh level corresponding to the predetermined amount of water vapor until the food discrimination time Tw based on the above, it is determined that the food is heated and the heating after the Tw time is not performed. Continue heating with the same contents as the heating until then, the sensor signal as the detection point indicating that food can be heated about 80 to 90% is the initial level
By utilizing the time T ₁ that is α times V _max , additional heating is performed K times the time T _{1 in} order to sufficiently heat the food. In addition, constants are used for α and k used for the calculation in the control unit 5.

In addition, in the heating sequence (b) of thawing and warming as the second heating procedure, the level change of _Δh from the sensor signal initial level V _max does not appear before the Tw time based on the food weight W, so Tw The type of food is identified as the food that has been thawed and reheated in time. Then, the thawing and heating sequence is performed as the second heating procedure from the Tw time, and therefore the intermittent heating is performed after the Tw time. The sensor signal as a detection point indicating that 80% to 90% of the food can be heated by continuing intermittent heating is the initial level V
By utilizing the time T ₁ that is α times _max , the additional heating is performed K times the time T _{1 in} order to sufficiently heat the food. In addition, constants are used for α and k used for the calculation in the control unit 5.

With the above configuration, it is possible to distinguish the type of food in a series of heating operations and perform heating suitable for food, and since the heating menu selection keys for selecting heated food are unified, the user can select the heating menu. This is effective in preventing the food from being mistakenly heated by mistakenly operating the key.

Next, as another embodiment of the present invention, the value of α as a coefficient for setting the heating condition of the food is calculated as a function of the weight W of the food in the control unit to obtain the size of the food. It is possible to detect the heating completion of the food by adding the food information related to the above, and it is possible to realize the finer heating of the food. Further, the value of the additional heating time coefficient K for setting the additional heating time (K * T ₁ ) for correcting the insufficient heating of food should be calculated by the control unit as a function of the time T _{1 at} the detection point. The additional heating time can be set according to how water vapor or gas comes out from the food, so the heating status of the food can be added to the setting of the additional heating time as information as the food status. For this reason, it is possible to realize the finely-kneaded additional heating according to the state of the food, and it is possible to obtain a good heating state as the food.

Further, in this embodiment, as the first heating procedure and the second heating procedure, the continuous heating and the intermittent heating of the radio wave heating were performed, but the heating capacity or the heating means including the electric heating of the heater is not limited to the radio wave heating. There is an effect that a heating sequence that is more suitable for food can be realized by switching or selecting the food item.

On the other hand, the detection circuit 15 that transmits the signal from the weight sensor 10 or the atmosphere sensor 12 to the control unit 5 has a signal processing circuit corresponding to an A / D converter, so the sensor signal is divided into 128 steps, 256 steps, 512 steps, etc. Often handled as a voltage level.

Effects of the Invention As described above, the heating device of the present invention has the following effects.

(1) Since the type of the object to be heated is discriminated during heating, and thereafter the heating means is controlled according to the discriminated type of the object to be heated, a heating finish suitable for the object to be heated can be realized.

(2) The type of object to be heated can be discriminated during heating, and many foods and quantities can be realized with a small heating menu selection key.

[Brief description of drawings]

FIG. 1 is a block diagram showing a relevant part in an embodiment of the present invention, FIG. 2 is a front perspective view of a heating device in an embodiment of the present invention, and FIG. 3 is heating of a heating device in an embodiment of the present invention. FIG. 4 is a sequence flowchart from the start to the selection of the heating procedure, and FIG. 4 is the time until a predetermined amount of water vapor comes out and the weight of the food according to the food for the food discrimination of the heating device in the embodiment of the present invention. FIG. 5 is a graph showing the relationship between the sensor signals of the first heating procedure (a) and the second heating procedure (b) of the heating apparatus in the embodiment of the present invention, and the state of changes with time of radio wave heating. FIG. 4 ... Menu selection key, 5 ... Control part, 9 ... Magnetron, 10 ... Weight sensor, 12 ... Atmosphere sensor, 17 ...
…heater.

Claims (1)

[Claims] 1. A heating chamber for accommodating an object to be heated, a heating unit provided in the heating chamber, a control unit for controlling power supply to the heating unit, and water vapor or gas generated from the object to be heated is detected. An atmosphere sensor and a weight sensor for weighing food weight are provided, and the control unit sets the food discrimination time according to the weight of the heated object detected by the weight sensor when starting heating of the heated object, A configuration for determining whether the detection signal of the atmosphere sensor has reached a preset predetermined value, determining the type of the object to be heated, and controlling the heating means according to the determined type of the object to be heated. Heating device.