JPS6226048B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heater such as an electric oven or a gas oven, and in particular to heating control thereof, and its purpose is to skillfully cook food, which is an object to be heated.

Conventionally, heating control in heaters such as electric ovens and gas ovens has been performed as follows.

First, a predetermined temperature corresponding to the food is set, then the heating time is set, and then the cooking start switch is closed.

However, in this case, the time required for the inside of the heating chamber to reach a predetermined temperature varies depending on the type and amount of food, the temperature, etc. For this reason, the time during which the food is heated to a predetermined temperature constantly varies, which deteriorates the quality of the food.

Therefore, the present invention attempts to eliminate the above-mentioned conventional drawbacks by maintaining the temperature inside the heating chamber at a predetermined temperature for a predetermined period of time.

An embodiment in which the present invention is applied to an electric oven will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is an electric oven main body, and an operation panel 2 is provided on the front side of this main body 1.

In the center of this operation panel 2 are key switches 3 and 4 for inputting numerical values from 0 to 9.
5, 6, 7, 8, 9, 10, 11, 12 and a key switch 13 for clearing are provided.

Further, a display section 14 for selectively displaying the heating time and heating temperature is provided above these key switches 3 to 13, and the heating time and heating temperature on this display section 14 can be distinguished by lighting unit lamps 15 and 16. It is now being done by

On the other hand, below the key switches 3 to 13 are a key switch 18 that instructs to increase the temperature of the food to be heated (FIG. 2 17), a key switch 19 that instructs to decrease the temperature of the food (FIG. 2 17), and a key switch 19 that instructs the temperature of the food (FIG. 2 17) to decrease. A key switch 20 is provided for instructing to maintain the temperature constant (Fig. 2 17), and each key switch 18, 19, 20 has an indicator light 18', 19', 2
0' is correspondingly provided.

The key switch 21 provided below the keys 18 to 20 is for starting cooking, and the key switch 22 is for stopping.

Figure 2 is a block diagram showing the main parts of the electric circuit of the electric oven, and 2 in Figure 4.
3 is a heating chamber, and in this heating chamber 23, in addition to the above-mentioned food 17, an electric heater 24 and a temperature detector 25 are provided.

In addition, 26 is the key switch 3 to 13, 18.
22, etc., and various input signals 26' from this input device 26 are stored in a storage section 28 via a controller 27.

The contents stored in the storage section 28 are sequentially read out to the controller 27, and are read out to the controller 27, including the display section 14, unit lamps 15, 16, indicator lamps 18', 19', 2.
0' and a temperature controller 30.
and the timer 31 as appropriate.

In the above configuration, when cooking a heating pattern in which food 17 is heated at 120° C. for 30 minutes and then heated at 60° C. for 15 minutes, the operation shown in FIG. 3 is performed.

That is, the key switch 18 that increases the temperature
After pressing , press 120° key switches 4, 5, and 3 in sequence.

Then, "120" is displayed on the display section 14, and at the same time, the unit lamp 15 is lit.

Next, switch the key switch 2 to maintain the temperature.
Press 0, then press key switches 6 and 3 for 30 minutes in sequence.

Then, "30:00" is displayed on the display section 14, and at the same time, the unit lamp 16 is turned on.

Next, press key switch 1 to lower the temperature.
Press 9, then press 60℃ key switches 9 and 3 in sequence.

Then, "60" is displayed on the display section 14, and at the same time, the unit lamp 15 is lit.

Next, switch the key switch 20 to maintain the temperature.
Press , then press key switches 4 and 8 for 15 minutes in sequence.

Then, "12:00" is displayed on the display section 14, and at the same time, the unit lamp 16 is turned on.

In this state, when the key switch 21 for starting cooking is pressed, heating control as shown in FIG. 4 is performed.

In other words, when this key switch 21 is pressed, the temperature inside the heating chamber 23 gradually rises from the air temperature (T ₁ ) and eventually reaches 120°C (T ₃ ).
8' is lit. The temperature is then maintained at 120° C. for 30 minutes (t ₁ ), during which time the indicator light 20' is lit. ) After this 30 minutes, the temperature is now 60℃ (T ₂ )
During this time, the indicator light 19' is lit. Also, when reaching 60℃ (T ₂ ), this 60℃
(T ₂ ) is maintained for 15 minutes (t ₂ ), during which time the indicator light 20' is lit again, and after 15 minutes, complete heating is completed.

In this case, regardless of the temperature (T ₁ ), the type and amount of the food 17, the food 17 is activated by various key switches 3 to 12,
As set in steps 18-20, it is heated at 120℃ (T ₃ ) for 30 minutes (t ₁ ), then at 60℃ (T ₂ ) for 15 minutes (t ₂ ), so the taste and shape are well-cooked. It turns out.

In addition, heating for a predetermined time while maintaining a predetermined temperature can be easily set by pressing the key switches 18 to 20 or the key switches 3 to 12, so it is very easy to use. Optimum heating corresponding to various foods 17 can also be performed by a combination of 20, 3 to 12.

FIG. 5 is a flowchart showing the operation contents of the controller 27, and the contents programmed in this flowchart are coded and stored in the storage section 28. 40 is key switch 3 to 13, 18
- 22; 41 is a program that interprets the meaning of the input key switch and stores it in the storage section 28; 42 is a program that displays a predetermined numerical value on the display section 14; 43 is a program that reads instructions from the start switch 21. A confirmation program 44 is a program for controlling temperature and time based on the stored contents of the storage unit 28, 45 is a program for confirming completion of heating control, and 46 is a program for stopping open heating.

FIG. 6 is a circuit example in which the block diagram shown in FIG. 2 is constructed based on a 4-bit 1-chip microcomputer. In the figure, reference numeral 47 uses a 4-bit, 1-chip microcomputer, MN1400 series (manufactured by Matsushita Electronic Industries), which includes the controller 27, storage section 28, and timer 31 shown in FIG. Light emitting diodes are used as the unit lamps 15, 16, indicator lights 18', 19', and 20', and the digital time and temperature display section 14 has a 7-segment x 4-digit configuration.

48 is a negative logic circuit (inverter). 3
0a is a voltage-frequency conversion type A-D converter circuit that converts into a binary number whose cycle changes according to the temperature level detected by the oven temperature detector 25 such as a thersistor; 30b is a microcomputer 47; This is a solid-state relay circuit including a triax for controlling the electric heater 24 on and off using a binary signal.

In the microcomputer 47, A ₀ ,
A ₁ , A ₂ , A ₃ and B ₀ are 4-bit input terminals, C
φ, C ₁ , C ₂ , . . . C ₈ are output terminals that can each be independently controlled on and off, and Dφ to D ₇ are 8-bit parallel output terminals.

Furthermore, the microcomputer MN1400 has built-in 4-bit x 64 RAM and 8-bit x 2048 RM as memories.

Input terminal Aφ~ _A3 is connected to output terminal Cφ~ _C3 ,
A matrix circuit is constructed, with a key switch placed at each intersection.

In the above configuration, Cφ, C ₁ , C ₂ , and C ₃ sequentially generate pulses with a constant pulse width, and when a certain key switch is pressed, the above pulse passes through that key switch and is input to one of Aφ to A ₃ . It is designed to be input to the terminal. For example, C
When φ is generating a pulse, press STP key 2
When 2 is pressed, a pulse is input to _A3 .

The above operation decodes which key switch was pressed. This operation corresponds to program 41 in FIG.

For example, if you press a key in the sequence shown in Figure 3 using a key switch content decoding program,
The control procedure as shown in FIG. 4 and the set time and temperature for each sequence are stored in a readable/writable memory RAM in the microcomputer.

On the other hand, the sequential pulses from Cφ to _C3 also serve as timing pulses for the dynamic display of four-digit time/temperature, and sequentially display four decimal digits in synchronization with the segment display pulses output from Dφ to _D7 . The operations to be displayed correspond to program 42 in FIG.

When the STA key 21 is pressed, the output of the output terminal _C8 is turned on, the electric heater 24 is energized through the solid state relay, and heating of the oven is started.

The temperature of the oven is detected by a temperature sensor 25.
The signal is taken into the terminal Bφ of the microcomputer 47 via the AD conversion circuit 30a. The electric heater 24 is controlled on and off so that the detected temperature value and the set temperature value are equal to or close to each other, and the heating time is counted so that the set temperature is maintained during the set time. This operation corresponds to program 44 in FIG. During this time, each heating type and temperature/time distinction is 15, 16,
It is displayed by light emitting diodes 18', 19' and 20'. This is activated by program 42.

In this way, the program of the microcomputer 47 is executed at high speed based on the flowchart of FIG. 5, and when the heating termination condition, for example, _t2 in FIG. 4 has elapsed, the output terminal _C8 is turned off and heating is started. finish.

In the above-mentioned embodiment, heating control was performed using an electric open circuit, but the present invention can also be applied to other heaters such as gas ovens and microwave ovens.

As described above, according to the present invention, it is possible to maintain the food at a predetermined temperature and heat it for a predetermined time regardless of the temperature, type of food, and amount, so that the taste and shape of the food are good, and various foods can be skillfully cooked. be able to.

Furthermore, according to the present invention, heating for a predetermined time while maintaining a predetermined temperature can be easily set by pressing various key switches, so it is easy to use and can be used for various foods by combining various key switches. Optimal heating can also be achieved.

[Brief explanation of the drawing]

Fig. 1 is a front view of the main parts showing an embodiment in which the present invention is applied to an electric oven, Fig. 2 is a block diagram of the main part electric circuit of the electric oven, and Figs. 3 and 4 are the main parts of the electric oven. FIG. 5 is a flowchart explaining the operation of the controller, and FIG. 6 is a circuit diagram in which the controller is realized by a 4-bit microcomputer. 3, 4, 5, 6, 7, 8, 9, 10, 11, 1
2, 18, 19, 20... Key switch (input setting means), 17... Food (material to be heated), 18', 1
9', 20'... Indicator light, 24... Electric heater (heating means), 25... Temperature detector (temperature detection means).

Claims (1)

[Scope of Claims] 1. A device comprising a heating means for heating an object to be heated, a temperature detection means for detecting the temperature of the object to be heated, and an input setting means for setting a heating pattern of the object to be heated by the heating means. , the input setting means includes a key switch for inputting a numerical value, a key switch for instructing a rise in the temperature of the heated object, a key switch for instructing a decrease in the temperature of the heated object, and a key switch for maintaining the temperature of the heated object at a constant level. A heater configured to include a key switch for instructing. 2. Indicator lights are installed in correspondence with a key switch that instructs to increase the temperature of the heated object, a key switch that instructs a decrease in the temperature of the heated object, and a key switch that instructs to maintain the temperature of the heated object at a constant level. 2. The heater according to claim 1, wherein a corresponding indicator light is turned on while the cooking pattern set by each of the key switches is in progress.