JPS642857B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating device having a function of controlling the inside of a heating chamber to a certain ambient temperature and heating a heated object.

Prior Art When heating an object to be heated for a predetermined period of time at a certain ambient temperature, for example in the case of "oven cooking," the inside of the heating chamber must be heated to a predetermined temperature before placing the object to be heated in the heating chamber. Warm up to temperature
That is, preheating is necessary. Therefore, in such atmospheric heating, two types of heating are sequentially performed: preheating (air firing of the heating chamber) and main heating (baking of the object to be heated).

Now, like this, cooking in an oven that requires complicated operations,
Heating devices that are automated for each menu, including preheating, are now in practical use. In such a heating device, a heating pattern that sequentially performs preheating and main heating (baking) is stored in memory, and when a menu is selected, preheating is performed first, and then the object to be heated is heated. If you place it indoors and start it again, it will automatically switch to main heating and start baking.

Problems to be solved by the invention However, even with such an automatic oven,
Although the preheating temperature is automatically set, the user cannot leave the heating device because the time required for preheating is unknown.

Furthermore, since the time required for preheating is directly affected by the temperature inside the heating chamber at the time of start, the power supply voltage, etc., it is not easy to notify in advance the time when preheating will be completed.

In view of this background, the present invention realizes a system that can estimate the preheating completion time and notify this.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a main control section that controls power supply to the heating means, and a notification means that notifies the rising time required for the inside of the heating chamber to reach a predetermined temperature. , a temperature detecting means for detecting the temperature inside the heating chamber, and a voltage detecting means for detecting the power supply voltage; It has a voltage discriminating means for discriminating the power supply voltage detected by the voltage detecting means, a register for temporarily storing data, and an arithmetic means for computing the data in the register.

Effect The heating device of the present invention classifies the temperature in the heating chamber immediately before or after starting heating into a plurality of levels using the temperature discrimination means, sets the corresponding rise time in a register, and then sets the power supply voltage to the voltage discrimination means. A correction term for the rise time is input into the calculation means according to the magnitude thereof, the rise time set in the register is decreased or increased by the calculation means, and this correction is performed using the notification means. Notify the rising time.

Example The structure of the present invention will be explained below with reference to the drawings.

FIG. 1 is a perspective view of the main body of a heating device equipped with an automatic oven heating function. A door 2 that can be opened and closed is pivotally supported on the front surface of the main body 1, and an operation panel 3 is provided. On the operation panel 3, there is a keyboard 4 as an input means for the user to issue various commands to the control section, a display window 5 for displaying heating time, output, heating temperature, etc., and a synthesized voice as part of the notification section. A sound groove 6 for output is arranged.

FIG. 2 is a block diagram showing the system configuration of such a heating device. The keyboard 4 is provided with function keys and numerical keys (1 to 0) for inputting output, time, and temperature during manual heating, and is further provided with an auto key according to the present invention. In addition, there are a start button to command the start of heating, a clear key to stop heating and cancel the program, etc. These are encoded in binary by the encoder 7 and sent to the microcomputer (hereinafter referred to as the "microcomputer") which is the main control unit. (abbreviated as ")" is entered in 8. A memory 9 is built into the microcomputer 8, and heating data corresponding to the auto key is stored here.

On the other hand, an object to be heated 11 is placed in the heating chamber 10, and the inside of the refrigerator is stirred by hot air from the rear wall of the heating chamber by a ring-shaped heater 12 and a circulation fan 27 serving as heating means. Reference numeral 13 denotes a thermistor which is a temperature sensor forming a part of the temperature detection means.

When the microcomputer 8 reads predetermined heating data from the memory 9 in response to the auto key commanded from the keyboard 4, it is stored in the microcomputer, for example.
Preset to a specified register such as RAM. Then, the sensor 13 is used to detect the temperature inside the heating chamber before or immediately after the start button is pressed. Reference numeral 14 denotes a detection circuit A for this purpose, which is composed of, for example, an A/D converter, and converts the resistance value of the sensor into a digital quantity and inputs it to the microcomputer.

Furthermore, the microcomputer 8 measures the power supply voltage of the heater 12 using a detection circuit B15 serving as voltage detection means. This may be constituted by, for example, an A/D converter, or may be a comparison circuit with a reference voltage made by a simple Zener or the like.

Based on this measurement, the microcomputer 8 first outputs the temperature of the first preheating to the fluorescent display tube 16 which is the display section, estimates the time required for preheating, and outputs the temperature to the voice synthesis synthesizer 17 which is the notification section, the voice memory 18 and the speaker 19. Notification will be made using synthesized voice. 2
0 is a driver including switching means such as a relay for supplying power to the heater 12.

Next, the functions of the main control section will be explained using the functional block diagram shown in FIG. 27 is a temperature detection means for detecting the temperature inside the heating chamber, and 28 is a voltage detection means for detecting the power supply voltage. The heating chamber temperature detected by the temperature detection means 27 immediately before or after the start of heating is classified into a plurality of stages by the temperature discrimination means 29, and the corresponding rise time T is set in the register 30.

On the other hand, the power supply voltage detected by the voltage detection means 28 is classified into multiple stages by the voltage discrimination means 31, and depending on the magnitude, the rise time correction term ΔT
is input to the calculation means 32, the rise time T set in the register 31 is corrected by decreasing or increasing it by the calculation means 32, and the notification means 33 is used to notify the corrected rise time.

Now, a specific example of performing automatic open heating with the above configuration will be described using FIG. 3.
First, assume that the auto 3 key is pressed. At this time, the microcomputer 8 notifies the user of the menu name that is dependent on this heating pattern using a synthesized voice following the buzzer sound Pi (``It's a butter roll''). Display data "A3" is also output to the display unit 16 to indicate that Auto 3 has been effectively accepted. The synthesizer 17 then notifies that the preheating data has been preset ("First, we will preheat").

Next, when the start button is pressed, the microcomputer 8 calculates or estimates the time required to reach the preheating temperature from the temperature in the heating chamber and the power supply voltage, and notifies this using a synthesized voice ( In a standard cold state where the temperature inside the heating chamber starts from room temperature, it will notify you that "preheating will be completed in about 8 minutes", and in a hot state where the temperature in the heating chamber has already risen, it will notify you that "Preheating will be completed in about 8 minutes", as in "Other""Preheating will be completed in approximately 0 minutes."In addition,
The "0" in "approximately 0 minutes" is the time calculated by the microcomputer. ).

After the preheating completion temperature is "180", the display shows the heating chamber temperature at the time of start ("32" in the case of FIG. 3). Thereafter, as preheating progresses and the temperature in the heating chamber rises, the display changes (in the case of Figure 3, "130" is shown as the temperature during preheating).

Next, the case where the temperature inside the heating chamber at the start time is different will be explained in detail using FIG. 4.

FIG. 4 is a diagram showing the temperature rise characteristics in the heating chamber. Curve A shows the standard pattern starting at room temperature and requiring 8 minutes to reach 180°C.
If the power supply voltage changes at this time, the slope of increase will naturally change. B is the characteristic at 110% voltage, and C is the characteristic at 90% voltage. In this case, ΔT ₁ from standard time Ts
(1 minute), it is sufficient to notify the time corrected by ΔT ₂ (1 to 2 minutes).

On the other hand, a case will be described in which the heating chamber is already warmed up. In this case, there are two main trends, curves D and E. curve D
indicates that the inside of the refrigerator has already cooled considerably, that is, a certain amount of time has passed since the previous heating. Since only the area near the sensor is still hot, when stirring begins, the inside of the refrigerator becomes uniform and the temperature near the sensor temporarily decreases. Therefore, in such a case, although the sensor has already reached 100℃, standard pattern A
It is not possible to simply subtract 4 minutes from In reality, it takes 5 minutes.

Another curve E occurs when the refrigerator is stopped while the temperature inside the refrigerator is rising. In other words, the heater chamber has reached a sufficiently high temperature, but the area near the sensor has not yet warmed up. Open the door during preheating,
This also applies when restarting. In this case, the preheating completion time is even faster than 4 minutes, and is reduced to about 3 minutes.

Although this is given as an example, if the temperature inside the refrigerator and the power supply voltage at the time of starting heating can be measured, and the tendency of temperature increase immediately after starting heating can be detected, the preheating time can be estimated quite accurately. Therefore, the temperature display can be output on the display, and the approximate value of the preheating time can be output on the synthesized voice. Note that although synthesized speech was used as the notification means in this embodiment, notification means such as a display tube or LED can of course be applied.

Now, let's return to Figure 3 and continue the explanation. When preheating is completed, the display will show "180" which is the preheating end temperature.
The end of preheating is notified after several buzzers ("Preheating is complete"). It then continues adjusting the temperature and waits for the user to arrive (wait cycle). Since the user has an idea of the preheating end time, he or she can return to the heating device just before that time. In other words, the waiting time can be kept extremely small even if the wait time is not constant.

After the UIT cycle, when the user opens the door, the microcomputer 8 will notify the cooking procedure for main heating and the attachments to be used (that can be used). please.”) This has made it unavoidable to have a large number of attachments, especially in heating devices that combine a microwave and an oven (metal dishes go in the oven, glass dishes go in the microwave, etc.). This makes it easy to use the software without making mistakes.

By using the synthesized voice, the temperature sensor, and the power supply voltage detection means in this manner, the preheating sequence, which was conventionally troublesome, can now be performed easily and without failure.

FIG. 5 is a circuit diagram showing a specific example of such a temperature sensor and voltage detection means. Microcomputer 8
is a P or N channel MOS. Ref ₀ to Ref ₄ to create a reference voltage from this microcomputer 8
is output. 21 is a switching means such as a C-MOS inverter, which forms a D/A converter together with a resistor ladder 22, and converts the reference analog voltage.
Output V _Ref .

On the other hand, the thermistor 13 as a sensor is connected to one input terminal of the comparator 23, and the reference analog voltage
Compared to V _Ref . Therefore, by changing Ref ₀ to Ref ₄ bit by bit, the resistance value of the thermistor 13 can be measured by monitoring the input terminal I ₁ .

Next, the power supply voltage detection means will be described. The secondary side of the low voltage transformer 25 is rectified to create the voltage to be measured Vm. This is connected to one input of a comparator 26 and compared with a reference analog voltage V _Ref . Therefore, like the thermistor 13, it can be measured by monitoring the input terminal _I2 . Note that this voltage to be measured Vm
Naturally, it can be used as a DC power source in a control system. In addition, by making this a constant voltage and using it as a power source for the microcomputer 8, you can quickly detect the occurrence of troubles such as momentary power outages, so you can forcibly reset the microcomputer 8 while it is operating normally. It can prevent the microcontroller from running out of control.

As described above, according to the present invention, in a device that performs heating by raising the ambient temperature, it is possible to automate the process including the preheating cycle for raising the heating chamber to a predetermined temperature, and furthermore, the user can have time in advance to complete the preheating. Since the user does not have to be present at the heating device, it is possible to realize a system that can finish preheating in the shortest possible time by simple operation and smoothly transition to the subsequent main heating.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main body of a heating device showing an embodiment of the present invention, Fig. 2 is a block diagram showing the system configuration, Fig. 3 is a diagram showing a specific example of operation, notification, and control, and Fig. 4 5 is a diagram showing temperature rise characteristics in the heating chamber, FIG. 5 is a circuit diagram embodying the sensor and power supply voltage detection circuit, and FIG. 6 is a functional block diagram showing the functions of the main control section. 4...Keyboard, 5...Display window, 8...Microcomputer, 9...Memory, 10...Heating chamber, 12...
Heater, 13...Sensor, 15...Power supply voltage detection circuit, 17...Synthesizer, 18...Audio memory, 19...Speaker.

Claims (1)

[Claims] 1. A heating chamber in which the object to be heated is placed, a heating means coupled to this heating chamber, a main control unit that controls power supply to this heating means, a memory that stores a plurality of heating data, and a an input means for reading predetermined heating data from the data and instructing its execution; a display section for displaying the temperature inside the heating chamber; and a notification means for notifying the rising time required for the inside of the heating chamber to reach a predetermined temperature; The main controller includes a temperature detecting means for detecting the temperature inside the heating chamber, and a voltage detecting means for detecting the power supply voltage, and the main control section further includes a temperature determining means for determining the temperature within the heating chamber detected by the temperature detecting means, and a voltage detecting means for detecting the power supply voltage. A voltage determining means for determining the power supply voltage detected by the detecting means, a register for temporarily storing data, and an arithmetic means for calculating the data in the register, and starts heating detected by the temperature detecting means. The temperature in the heating room immediately before or immediately after is classified into a plurality of stages by the temperature discriminating means, the corresponding rising time is set in the register, and then the power supply voltage is classified into a plurality of stages by the voltage discriminating means, and the magnitude thereof is determined. inputting a rise time correction term into the calculation means, and correcting the rise time set in the register by decreasing or increasing it by the calculation means;
A heating device configured to notify the corrected rise time using the notification means.