JPS6349634A - Oven cooker - Google Patents

Abstract

PURPOSE:To eliminate the overshoot of a temperature at the center of a heating chamber than a preheating temperature, and shorten a time required until the finish of preheating is informed, by heating the heating chamber so that the temperature at the center of the chamber becomes the temperature of a temperature detecting unit added with the correcting value of the temperature. CONSTITUTION:The preheating of an oven is started and Bmin is set in a temperature correcting value B. The Bmin is zero usually, therefore, it clears the temperature correcting value B. Next, the temperature (t) of a temperature detecting unit is measured. Subsequently, it is detected whether overflow is caused in a counter, counting a given time, or not. When the overflow is caused, a value S1 is added to the temperature correcting value B when it is before the finish of the preheating, however, a value S2 is subtracted from the same when it is after the finish of the preheating. Here, there is a condition Bmin<=B<=Bmax. When a temperature T (t+B) is smaller than a preheating temperature C, it is judged that the preheating temperature has not achieved, therefore, heating operation is continued. When T>=C thereafter, it is judged that the preheating temperature has been achieved, therefore, the finish of the preheating is informed and heating operation is stopped further.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to temperature measurement during oven preheating of an oven cooker.

BACKGROUND ART Conventionally, for example, when you want to preheat an oven in an oven cooker shown in FIG. 2, press the "Oven Preheat" key 1 in FIG. 3 to increase the preheating temperature, then press the "Decrease" key 3. Settings are made by pressing several times, and oven preheating is started by pressing the "Start" key 4.

When oven preheating starts, in FIG. 5, the control unit 6 closes the switching element 7 to energize the upper heater 8 or the lower heater 9.

Switching between the upper heater 8 and the lower heater 9 is performed by a switching element 10.

In FIG. 4, by supplying electricity to the upper heater 8 or the lower heater 9, the temperature of the heating chamber 11 increases. And this heating chamber 11
The control unit measures the temperature of the heating chamber 11 using the temperature sensing element 12 connected to the heating chamber 11, and when the temperature reaches the preheating temperature, the control section determines that the preheating is complete and notifies the completion of the preheating by the display tube 5 or the buzzer 13 (see FIG. 5). , and the heating operation is stopped by opening the switching element 6.

Problems to be Solved by the Invention However, in the conventional method of detecting temperature at the completion of preheating, the rate of temperature rise from the start of oven preheating in the center of the heating chamber 11 and in the vicinity of the temperature sensing element 12 shown in FIG. 4 is different. In the center of the room, near the upper heater 8 and lower heater 9, the temperature rises quickly, but in the vicinity of the temperature sensing element 12, the temperature rises relatively slowly.
To explain with Figure 6, the graph of the temperature rise at the center of the heating chamber is human, and the graph of the temperature rise near the temperature sensing element is t.
In other words, even though the temperature at the center of the heating chamber reaches the preheating temperature C in a while, the temperature rise near the temperature sensing element is slow, and it takes a while to reach the preheating temperature gc. The time becomes slow to D2. Normally, we would like to notify the completion of preheating with Dl, but we will notify the completion of preheating with D2. From the user's point of view, the preheating time is D2-
It will take a longer time by Dl. In addition, even though the preheating temperature C has been reached at Dl, heating continues, resulting in a person's geo-bar shooting.

If the temperature sensing element 12 is located in the center of the heating chamber in Fig. 4, there would be no problem as described above, but due to structural and layout constraints such as the need to place food in the heating chamber, the temperature sensing element 12 in Fig. 4 is It has no choice but to be placed in the position of

The present invention solves these conventional problems, and aims to prevent the temperature at the center of the heating chamber from significantly overshooting the preheating temperature, and to shorten the time required to notify the completion of preheating. With the goal.

Means for Solving the Problems In order to achieve the above object, the oven cooker of the present invention is equipped with a temperature correction value at the start of preheating, and calculates the temperature obtained by adding the temperature correction value to the temperature near the temperature sensing element. Set the temperature at the center of the heating chamber. Moreover, the temperature correction value is cleared at the start of oven preheating, increases by a fixed temperature range at fixed intervals until oven preheating is completed, and then decreases by a fixed temperature range at fixed intervals after oven preheating is completed. It is.

By adopting the above-described configuration, the oven cooker of the present invention can notify completion of preheating when the center of the heating chamber reaches the preheating temperature, and the time required to complete preheating can be shortened compared to conventional ovens. can. It is also possible to prevent the temperature at the center of the heating chamber from overshooting the preheating temperature.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a flowchart of the control section. When you start preheating the oven, first set Bmin to the temperature correction value B. Normally Bm. Since is 0, B is cleared.

Next, the temperature in the vicinity of the temperature sensing element, that is, the temperature detection section is measured and is set as t. Next, it is detected whether a counter that counts a certain period of time has overflowed. If there is an overflow, then S is added to the temperature correction value if it is before the completion of preheating, and S2 is subtracted if it is after the completion of preheating. However, B
has the condition Bwin≦B≦B□k. For example, if the constant time is 20 seconds, S is 2°C, S2 is 1°C, and Bmin-Or "max = 30°C,
Temperature correction value B increases by 2℃ every 16 seconds) B in 6 minutes
m, Lx becomes 30°C. After completion of preheating, B decreases by 1°C every 20 seconds and becomes Q'c of Bmin in 910 minutes. Here, the temperature T at the center of the heating chamber is set to t-+-B, and as long as T is smaller than the preheating temperature C, it is assumed that the preheating temperature has not been reached and the heating operation is continued (the heater is turned on).

After that, when T≧C, it is assumed that the preheating temperature has been reached, and a notification of completion of preheating is issued, and the heating operation is further stopped (the heater is turned off). To show this in an actual graph,
It will look like Figure 7. When the temperature correction value is not added, the time required for preheating is D4, whereas when it is added, the time required for preheating is D3, which means that the time required for preheating is reduced by D4-D. Also, the overshoot of the actual temperature at the center of the heating chamber will not be so large.

Effects of the Invention As described above, the following effects can be obtained by the present invention.

(1) The completion of preheating is not notified when the area near the temperature sensing element reaches the preheating temperature, but the completion of preheating is notified when the center of the heating chamber reaches the preheating temperature, so preheating completion is notified in the original sense as an oven cooker. Moreover, the time from oven preheating start to preheating completion notification can be shortened.

(2) Since it is possible to prevent the temperature at the center of the heating chamber from overshooting the preheating temperature by a considerable amount, it does not adversely affect the quality of cooking, and the energy that would otherwise occur can be saved.

[Brief explanation of the drawing]

FIG. 1 shows a temperature control system during oven preheating of the oven cooker according to the present invention. FIG. 4 is a sectional view of the main body of the oven cooker, and FIG. 5 is a block diagram showing the configuration of the control section. FIG. 6 is an explanatory diagram showing an example of conventional oven preheating control, and FIG. 7 is an explanatory diagram showing an example of oven preheating control according to the present invention. 1... "Oven preheat" key, 2...
"Up" key, 3... "Down" key, 4.
..."Start" key, 6...Display tube,
6... Control unit, 7... Switching element, 8... Upper heater, 9... Lower heater, 10... Switching element, 11...
- Heating chamber, 12...Temperature sensing element (temperature detection section), 13...Buzzer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure B-1 Coffin Figure 2 Figure 3 Figure 4 Figure 5 A-77 [1 bear! At the end of the shoulder circle, T-Yuyu sensing Itota 1g. Figure 6: Chairs

Claims (2)

[Claims] (1) A heating chamber in which food is placed and cooked, an electric heating device connected to the heating chamber, a temperature detection unit also connected to the heating chamber, a means for inputting the start of oven preheating, and a means for executing oven preheating. means for detecting whether the preheating temperature is reached and oven preheating is complete;
A means for storing whether or not oven preheating has already been completed, a counter for counting a certain period of time, a temperature correction value for calculating the temperature at the center of the heating chamber from the temperature of the temperature detection section, and power supply to the electric heating device. , a control unit that commands a stop, and the temperature at the center of the heating chamber is the temperature obtained by adding a temperature correction value to the temperature of the temperature detection unit, and the control unit performs heating control at the temperature at the center of the heating chamber, and adjusts the temperature at the temperature correction value to the temperature at the center of the heating chamber. is cleared at the start of oven preheating, and until oven preheating is completed, a fixed temperature range is added each time the counter that counts a certain period of time overflows, and after oven preheating is completed, every time the counter that counts a certain period of time overflows. An oven cooker configured to reduce the temperature by a certain range. (2) The oven cooking device according to claim 1, wherein the temperature correction value has a maximum limit and a minimum limit.