JPS61232811A - Combustion control of rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a combustion control method for a rice cooker.

[Prior Art and its Problems] A conventional gas rice cooker in which combustion conditions are controlled by a built-in microcomputer has a structure as shown in FIG.

A temperature detection means (1) for detecting the internal temperature is attached to the outer bottom of the pot (2), and a microcomputer (30) opens and closes the main solenoid valve (4) according to the output of the temperature detection means (1). Controls the combustion state of the burner (5).

The entire rice cooking process is heated and controlled in the manner shown in the graph of FIG. 4, for example.

In this example, the entire rice cooking process includes a rice cooking and heating process (A) in which rice is continuously heated until the temperature inside the pot (2) reaches a predetermined temperature.
, a steaming heating step (B) which is carried out afterwards and repeating combustion and extinguishing for a certain period of time, and a steaming and extinguishing step (C) which is carried out last and which is left in an extinguished state for a certain period of time, and the steaming extinguishing step (C) is carried out. After the rice is cooked, a message indicating that the rice is cooked will be displayed.

With this device, if a power outage occurs during rice cooking and the power outage is canceled, the rice cooking will continue again, and the rice will be automatically cooked even after the power outage.

However, in the conventional method described above, if a power outage occurs during the steaming heating step (B) or the steaming and extinguishing step (C) during the rice cooking process, and the power outage is canceled, the rice continues to be cooked, but the rice is often burnt. There was a problem with going uphill.

This is because when rice cooking continues after the power outage is canceled, normal rice cooking will be repeated from the beginning.

That is, since the steaming heating process (B) and the steaming extinguishing process (C) are performed again at the end of the power outage, in the steaming heating process (B) which is performed repeatedly, the combustion control is controlled by the temperature inside the pot (2). The main burner (5) is forced to burn intermittently for a predetermined period of time, which causes the cooked rice to burn because the surplus moisture in the pot (2) has already decreased.

[Problem] The present invention provides a rice cooker in which rice cooking and heating are automatically controlled by energizing the appliance, in which the rice cooking process is a steaming and heating process (B).
Alternatively, even if the power outage that occurred during the steaming and extinguishing step (C) is subsequently canceled and rice cooking continues, the main burner ( An object of the present invention is to enable rice cooking to be controlled only by determining the temperature inside the pot (2) until the rice cooking is completed, without temporally controlling the combustion of step 5).

[Means] The technical means of the present invention for solving the above problems is to provide a timer (6
), a first determining means for determining the presence or absence of an output from the timer, a second determining means for determining the open/closed state of the rice cooking switch when the power is connected; A third determination means for determining a combination of the outputs of the second determination means is provided, and depending on the output from the third determination means, combustion control is performed to perform normal rice cooking again, rice cooking heating step (A), and steaming and extinguishing. Process (C)
The control is branched into a state where the rice is cooked after a power outage, which consists only of rice cooking after a power outage, and a state where the appliance is completely stopped, which continues to maintain the state where the appliance is stopped.

[Effect] The above technical means works as follows.

A first determining means that determines the output of the timer based on the electricity supplied from the power source when the power source is connected.

A second determining means for determining whether the rice cooking switch is opened or closed, and a third determining means for determining a combination of the outputs of the two determining means are activated.

Next, a case in which rice cooking is normally performed under normal conditions and a case in which rice cooking is carried out in an abnormal state after a power outage will be explained separately.

[In the case of normal normal rice cooking] If there is no power outage and rice cooking is performed normally from the beginning,
The timer is in the OFF state and there will be no output from now on.
Also, during normal rice cooking, the manual rice cooking switch is not turned on when the power is first connected.

Then, the first determining means and the second determining means determine that there is no output from the timer and that the rice cooking switch is not turned on, and the third determining means confirms the combination of these two determinations. . Then, the subsequent combustion control is selected in accordance with this combination, and the combustion control is shifted to normal rice cooking.

[In the case of rice cooking after a power outage within a predetermined period of time 1] Next, if a power outage occurs during rice cooking, most of the components of the rice cooker that were operated by the electricity supply from the power supply stop their functions, and the conventional method described above stops. Similarly, each part returns to its initial stopped state. However, only the rice cooking switch remains turned on.

Then, the timer starts operating independently from this power outage and continues to output an output only within a predetermined period of time.

Next, when the appliance starts to be energized again after the power outage ends, the first determining means operates at the same time to determine whether there is an output from the timer, that is, whether the power outage occurred within a predetermined time.

Then, the third determining means operates to output the output of the first determining means indicating that the power outage occurred within a predetermined time, and the output of the second determining means indicating that the rice cooking switch remains closed. From the combination with the output, confirm that it has occurred after a short-term power outage within a predetermined time. The subsequent combustion control is then selected in accordance with this combination, and the combustion control is shifted to the post-power failure rice cooking mode.

In the rice cooking process after a power outage, the rice cooking heating process (A) and the steaming and extinguishing process (C), in which combustion is controlled only by the temperature inside the pot (2), are performed again, leaving the combustion control controlled temporally. That will happen. Then, the cooking rice heating process (A
), when the temperature inside the pot (2) reaches the rice cooking temperature, the main burner (
5) is extinguished, and then a steaming extinguishing process is performed to maintain the extinguished state for a certain period of time. Therefore, the steaming and heating step (B) in which intermittent combustion is forced within a certain period of time as in the conventional method is not performed.

That is, when cooking rice after a power outage, the combustion in the main burner (5) is separated from the temporally controlled combustion control, and the combustion in the pot (2) is
This means that control can be performed only by determining the internal temperature.

[During a long-term power outage that exceeds a predetermined time] The process is the same as in the case of a short-term power outage until the power is re-energized after the power outage ends and the first determination means determines whether or not there is an output from the timer, but the timer output is determined. As a result, if there is no output, the time set on the timer has already passed, so it may be either a long power outage or a normal first rice cooking. I understand.

Furthermore, since the rice cooking switch is often left in the ON state during a power outage, the second determining means determines whether the rice cooking switch is ON.

Next, the third determination means operates to check the combination of no output from the timer and the ON state of the rice cooking switch, and selects subsequent control corresponding to this combination. That is, it continues to hold the instrument in a completely stopped state.

As described above, according to the technical means of the present invention, when rice cooking continues after a power outage, the combustion of the main burner (5) is not temporally controlled and is determined only by the temperature inside the pot (2). It will be controlled.

In addition, when there is an output from the timer but the rice cooking switch is in the open state, the rice cooking switch was artificially turned off during a short power outage, so the third determination means confirms this combination, Control is transferred to the complete stop state of the instrument corresponding to this combination.

[Effect] When rice cooking continues after a power outage, the combustion of the main burner (5) is not controlled in terms of time but is controlled only by determining the temperature inside the pot (2), so the rice cooking process is steam-heated. Even if the power outage that occurred during the step (B) or the steaming and extinguishing step (C) is subsequently canceled and rice cooking is continued, the rice will be cooked normally without burning.

[Example] Next, the above-described example of the present invention will be described in detail with reference to the drawings.

The specific structure of the gas rice cooker used in this example is t
As shown in Figure s1, the rice cooker basically consists of a rice cooking mechanism section (10) and a control section (3) that controls the rice cooking mechanism section (10).

The rice cooking mechanism (lO) includes a pot (2) with a temperature detection means (1) attached to the bottom and a main burner (2) that heats the bottom of the pot (2).
5) and an igniter (42) for igniting it, and a gas flow path (51) that supplies gas to the main burner (5).
) consists of a main flow path (52) and a bypass flow path (53). There is an orifice (4) in the main flow path (52).
3) and a main solenoid valve (41) are inserted therein, while an auxiliary solenoid valve (40) is inserted in the bypass flow path (53).

The main solenoid valve (41), the auxiliary solenoid valve (40), and the igniter (42) are control units that operate by determining the output of the temperature detection means (1) attached to the bottom of the pot (2). (
3).

For example, as shown in the figure, the control section (3) has a ROM (
31), a RAM (32), and a CPU (33).
3), the temperature detection means (1), and the auxiliary solenoid valve (40).
, main solenoid valve (41), igniter (42), manual rice cooking switch (35), etc. are interfaces (34).
The rice cooking mechanism section (10
) combustion conditions are controlled.

Further, one port of the RAM (32) is connected to the output terminal of a timer (6) that is set when the power is connected and starts at the same time as a power outage occurs.

The timer (6) is connected to a rectifier (B2) as shown in the figure.
a capacitor (83) of a predetermined capacity, one end of which is connected to the secondary side of the transformer (81) through the rectifier (62);
), the positive electrode of which is connected to the base of the switching transistor (84). The emitter side of the switching transistor (84) (7) is grounded, and the other collector side is connected to the positive electrode side of the capacitor (63) to form RAM (32).
), i.e., the power failure memory port) (8B).

Further, the negative electrode side of the capacitor (B3) is grounded.

Therefore, when the power source is connected, the timer (6) starts charging and eventually becomes saturated. On the other hand, since a voltage is also applied to the base of the switching transistor (64) at the same time as the power is connected, the switching transistor (B4) is turned on. Therefore, RAM (32
) port inner core switching transistor (B4)
Power failure memory port (H) to which the collector side of is connected
becomes grounded. Therefore, the "O" signal is input to the port while the power is connected to the port.

In the event of a power outage, the switching transistor (84
Since no voltage is applied to the base of ), the switching transistor (B4) is in an OFF state. As a result, a voltage is applied from the positive electrode of the capacitor (83) to the power failure storage port (H) of the RAM (32) to which the collector side of the switching transistor (84) is connected. That is, the "1" signal is input to the power failure memory port (H), and the capacitor (6
3) This rlJ signal continues to be input for a set time (in this example, it is set to 5 minutes) until the capacitor is discharged, and after the set time elapses, the amount of electricity stored in the capacitor disappears. After that, "0" will be input again to the power failure storage port (lli6).

Therefore, when re-cooking rice after a power outage within the set time has ended, the computer can determine whether or not there was a power outage within the predetermined time by looking at the power outage memory port (H) in the RAM (32). , This allows the subsequent rice cooking process to be selected.

Next, a program for controlling rice cooking is written in the ROM (31), and the contents of this program will be explained along with the actual use of the rice cooker according to the flowchart shown in FIG. 2.

When the power is connected, the capacitor (63
) is charged and the switching transistor (6
4) is in the ON state, a ground potential, that is, a "0" signal is input to the power failure memory port (66) of the RAM (32). At the same time, the computer starts operating, and first the procedure shown in (a) in Figure 2 is executed, and combustion control is performed in the following order.

(Regarding the preparation process) ① It is determined whether the rice cooking switch (35) is turned on when the electricity is turned on, and if the switch is turned on, the procedure is moved to ``■'' described later. On the other hand, if the rice cooking switch is not turned on, it is further determined whether there is an output from the timer (6) and the procedure is moved to the next step "■". and,
The procedure in the program for determining whether or not the rice cooking switch is turned on corresponds to the second determination means described above,
On the other hand, the procedure in the program for determining whether or not there is an output from the timer (6) serves as the first determining means described above.

■As a result of determining the output of the timer (6), there is no output and the power failure memory board (86) on the RAM (32) is
Q", the flag is set to "0" and the 1-manual rice cooking switch (35) is turned on as a starting condition, and the control is transferred to the rice cooking and heating process shown in FIG. , normal rice cooking will be executed.

On the other hand, the rice cooking switch is not turned on and the timer (6)
If there is an output from the RAM (32), that is, if the power failure memory board (B6) on the RAM (32) is set to "1" and the output indicates a power failure state, the set time (5 minutes in this example) It is determined that the rice cooking switch (35) was turned off artificially during a power outage within 10 minutes, and the control is terminated at this point.

The procedure in the program for determining the combination of the output state from the timer (6) and the open/closed state of the rice cooking switch (35) corresponds to the third determining means described above.

■. Contrary to the above ``■'', ``■J's hand a.; If it is confirmed in the process that the rice cooking switch (35) is turned on, the presence or absence of the output of the timer (6) is further checked. Then, there is no output from the timer (6) and the RAM
(32) When the power failure memory boat (8B) above is at rOJ, the rice cooking switch (35) is turned on and the output of the timer (6) is gone. In the example, it is determined that the power outage has continued for 5 minutes or more, and the control is terminated at this point. On the other hand, when the output from timer (6) is rlJ,
You can see that the rice cooking switch (35) remains turned on after the power outage ends within the set time (within 5 minutes).
When the flag is set to rlJ, the combustion control is transferred to rice cooking after a power outage, and control is first transferred to the rice cooking heating process shown in FIG.

(Regarding the rice cooking and heating process) The rice cooking and heating process is performed when it is determined to be normal rice cooking and after a short power outage within a predetermined time (5 minutes) according to the procedures in "■" and "■" above. It will be executed if it is determined that

This rice cooking process is shown in the same figure (a), and is a process in which the rice is heated intensively until the temperature inside the pot reaches the rice cooking temperature (usually 145°C), and combustion is controlled in the following order.

(2) First, open the auxiliary solenoid valve (40) and the main solenoid valve (41), and burn the main burner (5) at full output.

■Judging the output from the temperature detection means (1), the pot (2)
If the internal temperature has not reached the first set temperature (usually 115°C), the combustion state of the main burner (5) is maintained; if the internal temperature has reached the first set temperature, only the auxiliary solenoid valve (40) is closed. Then, start the main burner (5) on low heat.

09 Next, the temperature inside the pot (2) is determined again, and the temperature is the second
If the set temperature (usually 145°C) has not been reached, the main burner (5) is allowed to continue low-fire combustion, and if the temperature inside the pot (2) has reached the second set temperature, the main solenoid valve (41) is turned on. Close the main burner (5) to completely extinguish it.

09 Next, the flag set before determining whether the rice is being cooked normally or after a short power outage is determined, and if the flag is "1", that is, the rice is being cooked after a short power outage, the control is The process moves to the steaming and extinguishing process indicated by ``technique'' in the same figure, and after continuing extinguishing for 15 minutes, the rice cooking completion lamp is turned on to complete the rice cooking. Then, the rice cooking and heating process (A) and the subsequent steaming and extinguishing process of "work" become the post-power outage cooking process described above. On the other hand, when the flag is "0", ie, indicates normal rice cooking, the combustion control is shifted to the steaming step indicated by "T" in the figure.

(About the steaming process) In the steaming process, the main burner (5
) is intermittently burned to adjust the temperature; and the steaming and extinguishing process (C) is to maintain the main burner (5) extinguished for a certain period of time. The control is described below. It is done in the order of

■First, reset the computer's built-in timer.

(2) Next, both the auxiliary solenoid valve (40) and the main solenoid valve (41) are opened, and the main burner (5) is burnt at full output.

■The temperature inside the pot (2) is set at the third set temperature (usually 101°C).
), the main burner (5) continues combustion, and if the set temperature has been reached, the auxiliary solenoid valve (40) is activated.
, both the main solenoid valves (41) are closed to completely extinguish the main burner (5).

01Next, if the timer reset at the beginning of the steaming process has not passed 13 minutes, the procedure returns to "■" above, and if 13 minutes have passed, the steaming and heating process (
After completing B), the steaming extinguishing process (C) (the part within the imaginary line frame at the bottom of the figure) is executed.

■6 When the combustion control enters the steam extinguishing step (C), first the built-in timer of the computer is reset.

00Next, if the timer reset in "■" above has not elapsed for 2 minutes, the current extinguishing state will be maintained, and if the timer has elapsed for 2 minutes, the rice cooking completion lamp (not shown) will be turned on. , to complete cooking.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a rice cooker embodying the present invention, Fig. 2 is a flowchart of a program used in an embodiment of the present invention, and Figs. 3 and 4 are explanatory diagrams of a conventional example. 6) Fist timer (5)... Main burner (35) Φ, life cooking rice switch (A), Φ, rice cooking heating process (B), fist φ steaming heating process (C)... steaming extinguishing process

Claims (1)

[Claims] A rice cooker in which heating of rice is automatically controlled by energizing the appliance, comprising: a timer (6) that independently outputs an output for a set time when a power outage occurs; a first determination means for determining whether or not the timer outputs; and a rice cooker. a second determining means for determining the open/closed state of the switch when the power is connected;
A third determining means is provided for determining a combination of the outputs of the determining means, and depending on the output from the third determining means, combustion control is performed to re-execute normal rice cooking, rice cooking heating process (A), and steaming and extinguishing process ( Combustion control method for a rice cooker in which branch control is performed between post-power outage cooking consisting of only C) and a complete stop state in which the appliance continues to stop.