JPS59146617A - Automatic rice cooker equipped with multifunctional switch - 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] Technical Field What is the present invention? Regarding automatic rice cookers using a microcomputer as a JJ control circuit L, Special 1 (Relating to automatic rice cookers equipped with switches having many functions).

In a conventional rice cooker with a built-in microcomputer, by presetting a predetermined rice cooking program in a ROM (read only memory), the rice cooking operation can be automatically performed according to the program.

Usually, such automatic rice cookers have a large number of rice cooking modes and a timer function, so they are equipped with a large number of switches. As the number of switches increases, the structure becomes more complex and costs increase, and the probability of erroneous operation increases.

Purpose The present invention has been made in view of the problems mentioned in section 2 above, and an object of the present invention is to provide an automatic rice cooker with a reduced number of switches by allowing a single switch to perform a wide variety of functions.

composition FIG. 1 schematically shows the configuration of the present invention.

1 is a rice cooking switch for signal input, 2 is a temperature detection means for detecting the temperature of the inner pot of the rice cooker, and 3 is a breather for controlling the cooking operation according to a set mode.

This is a food mode control means. 4 is to decide which moto to change to.

When the signal input Δ is input from the rice cooking switch 1, the rice cooking mode at that time is inputted from the rice cooking key control means 3, and if necessary, the temperature signal from the temperature detection means 2 is also inputted. to decide where to change the rice cooking mode. Thus, the rice cooking switch 1 will perform various functions depending on the rice cooking mode when it is pressed, or the rice cooking mode and the temperature.

Figure 2 shows a schematic cross-sectional view of an actual case.

゛ 10 connects the bottom surface of the inner pot 12 of the rice cooker 11 to the heat transfer member 13
The provisional heater 14 is a bare wet heater.

During cooking, the temporary heater 10 effectively transfers its heat to the bottom of the inner pot 12, and the heat transfer member 1B contacts the bottom of the inner pot.
It is buried inside. The heat-retaining heater 14 is provided by wrapping around the upper side of the outer container 15 so that heat is transferred to the inner pot 12 via the inner pot 12.
A thermistor (hereinafter referred to as the first thermistor) is an example of a temperature detection means for detecting the bottom temperature of the inner pot 1.
A thermistor (hereinafter referred to as '') serves as a temperature detection means for detecting the side temperature of 2.

(referred to as Shimo Koshirae 2 thermistor).

The first thermistor 6 and the second thermistor 17 are brought into contact with the gate and side surfaces of the inner pot 12, respectively, by the pressing force of the spring, and the detection signals of both thermistors 16 and 17 are input to the microcomputer 18. The wires are connected so that the Reference numeral 19 denotes an electric circuit which receives a control signal from the microcomputer 18 and energizes the rice cooking heater] 0 and the warming heater 14. 20 is a micro switch, inside @12
Detects the presence or absence of the inner pot 12. If there is, the power circuit 19 is turned on and the power supply circuit 19 is turned on and the power supply circuit 19 is turned on until the inner pot 12 is placed to prevent dry cooking. 21 is the lid of the inner pot □. Although it is omitted in Sono, the outside is 15 degrees.
The surrounding area is filled with zero insulation material for heat retention, and the lid 21 may be provided with a known pressure regulating device. 2
Reference numeral 2 denotes a control unit containing a microcomputer 18, which is installed on the outer body of the rice cooker 11, and serves as a switch for controlling the rice cooker, in addition to the multi-function rice cooking switch 1 described above, a timer switch 23 and a burner switch, which will be described later. Figure 3 shows the direct system for the operation of the rice cooking heater 10. It is installed between VDD and ground, and each detection < s *-
=A/D converter input of the computer 18)
It is input to K2' and K1 and can be converted into a digital signal. The microcomputer 18 also sends on/off signals to the dry nozzle z'-25 for the respective signals of the rice cooking switch l and the timer switch 23, and the gate signal of the triac 26 via its driver 25. Control it. When the rice cooking heater IO is disconnected from the AC power source 27 via the triac 26, it is controlled to turn off.

In this embodiment, the amount of electricity supplied to the rice cooking heater 10 is controlled by the duty ratio of the on time controlled via the triac 26. In other words, when the 5 microcomputer 18 inputs the temperature signals from the first thermometer 16 and the second thermistor 17, the temperature signals are inputted at fixed time intervals (for example, 15 to (seconds), outputs an on signal for an appropriate period of time, and turns on the try book 26 using the driver 25. □The rice cooking heater 10 is energized and heated only for the time the triac 26 is turned on, so by changing the energized time, the desired amount of energization (rice cooking power) can be obtained.
It becomes.

Figure 4 shows the panel of the control unit 22 in this embodiment. A switch and l that can be operated by the operator.

There is a rice cooking switch 1, a rice cooker switch 2B, and a rice burner switch 240 that can adjust the degree of browning according to the preference 1c.
There are three. 30 is a diode that follows the program) 31
.about.38 are provided, and are sequentially lit one by one as the program progresses.It is desirable that 31 to 38 are appropriately color-coded.

40 and 41 timer switches 23 turn on the evening light.
In the case of set δ, the time display panel displays the remaining time until the rice cooking operation starts, and 40 indicates the time.
7 segments) LED element, 41 is a surface emitting element on which the number 30 (minutes) is displayed.

motion Next, the operation of an actual vertebra example will be explained.

FIG. 5 shows the relationship between the rice cooking mode executed in one embodiment and the bottom temperature of the inner pot.

At the beginning of one rice-cooking process, rice is cooked at a low temperature for 1 step to allow the rice to absorb enough water, for example, for 6 minutes. Preheat this step.
It is called 1. Next, increase the power of the rice cooking heater 10 to the maximum. This stage is called middle Patsuba mode.

Then, when the detected temperature of the second ±-mister 17 exceeds 50°C, the content moment is determined from the temperature gradient, and the supplied power is controlled according to the content value.

This stage is called power control mode l-. In this mode it will eventually boil over. Power con) I: I-/L/
After a certain period of time after starting the mode, the rice cooking heater power is changed to a predetermined ratio (
For example, 70%) to maintain the rising and falling state of υb.

This stage is called boiling maintenance.

As it continues to boil, the water will eventually disappear and the temperature will start to rise by E [-]. When the temperature reaches a predetermined temperature (for example, 137° C.), the mode shifts to uneven mode 1-'.

For unevenness 1 to mode F, turn off the rice cooking heater lO for a certain period of time (
After setting the temperature to 1)), turn on the temporary heater 10 for a period of time according to the setting value of the burn switch 24.
)) and turn it off again (uneven +~(8+') K+~
to complete the rice cooking operation and switch to keep warm mode. In the heat retention mode, the temperature of the rice is controlled to be a constant temperature (for example, 70'(1)) by turning on and off the heat retention heater 14.

The above is the normal rice cooking operation of the iE. For example, if the second thermistor 17 installed on the side of the inner pot is not normal, the rice cooking operation cannot be performed according to the program, so the electric power of the rice cooker/210 is Tokosaka Sen-do wo real 1-
i' do.

In this actual example, the rice cooking switch 1 can not only start the rice cooking operation as shown in Fig. 5 according to the conditions when it is pressed, but also start or cancel the timer operation, one solution to the rice cooking operation, and start or keep warm operation. Change operation mode C such as release.

Next, the operation of this rice cooking switch 1 will be explained in FIG. 6.

In Figure 6, all judgment symbols are rice cooking switches.
Represents the action of determining whether or not h is pressed.1. If it moves horizontally, it means yes, and if it moves vertically, it means no.

When the power is turned on, it enters the initial mode, and this mode 1□
When the rice cooking switch l is pressed, if the detected crystallinity of the second thermistor 17 is less than 55°C, the process proceeds to the next preheating mode and the rice cooking operation is started; If the detected temperature of No. 17 is 55° C. or higher, the temperature change mode is entered (step 81/).

When the rice cooking switch on preheating -F is pressed completely, the initial mode will start.
l'-\Return (step S2). This is the cancellation of the rice cooking operation. If the rice cooker switch l is not pressed in preheating mode, follow the set cooking program.
The rice cooking switch 1 is not accepted even if the rice cooking switch 1 is pressed in these modes.

In uneven mode, unevenness l), (2) or (3
), when the rice cooking switch l is pressed, the mode shifts to the keep warm mode (steps s3, s4
゜85').

When the rice cooking switch l is pressed in the heat retention mode, the heating mode is canceled and the rice cooker goes to the stop mode (Sudetsu 7'S6').
When the rice cooking switch 1 is pressed in the stop mode, the process returns to the preheating mode (step S'7').

When using the timer function, set the timer for one hour using the timer switch 23, then press the rice cooking switch to proceed to the timer mode (step S8).Timer mode 1 -When set (after 1 month has passed, automatically preheat single = tohe and cook rice ia! 1
However, if the rice cooking switch 1 is pressed in the timer-L mode, the timer operation is canceled and the operation shifts to the initial mode (step S8).

In addition, if the rice cooking mode shifts to the normal rice cooking mode due to an abnormality in the second thermistor 17 after starting the rice cooking operation according to the program, even if the rice cooking switch 1 is pressed, it will not be accepted.

Effects As described above, the present invention is configured so that a single switch, for example, rice cooker, performs many different functions depending on the conditions when it is pressed. This reduces the number of devices, simplifies the structure, reduces costs, and simplifies the design, reducing the probability that users will make incorrect operations.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the configuration of the present invention, Fig. 2 is a schematic sectional view showing one example of winding, Fig. 3 is a circuit diagram of the same case with the remaining main electrical system, and Fig. 4 is a sister example of the same case. FIG. 5 is a front view showing a panel of a control unit used in the same embodiment, FIG. 5 is a diagram showing a rice cooking program in the same embodiment, and FIG. 6 is a flowchart showing the operation of a rice cooking switch in the same embodiment. DESCRIPTION OF SYMBOLS 1... Rice cooking switch, 2, 16. 17... Temperature detection means, 3... Rice cooking mode control means, 4... Change destination mode determination means, 18... Microcomputer. Patent applicant: Zojirushi Mahobin Co., Ltd. Representative Patent Attorney Aoyama Shugai (3 persons) Figure 3 8 Figure 4

Claims (1)

[Claims] (1) A rice cooking switch, a temperature detection means, and a rice cooking mode control means for controlling the rice cooking operation according to a set mode using a detected temperature signal from the temperature detection means and a time, and the rice cooking operation is performed according to a preset program. When a signal is input from switch a, the automatic rice cooker is configured to operate a change destination mode determining means that determines a change destination of the rice cooking mode based on the rice cooking mode at that time and the temperature if necessary. An automatic rice cooker with a multi-function switch.