JPH0716467B2 - rice cooker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rice cooker with a microcomputer having a “porridge” menu and the like.

2. Description of the Related Art In recent years, many rice cookers that use a microcomputer have been developed, and with the diversification of users, there is a demand for rice cookers that can cook various rice cooking menus. There is a strong demand for the "porridge" course as a menu.

A conventional rice cooker of this type will be described with reference to the block diagram of FIG.

That is, as shown in the figure, the pot 60 is for putting rice in the pot, and the heating means 61 energizes the heating portion to heat the pot 60. The pot temperature detecting means 62 is a pot
The temperature detection signal of 60 is output, the cooking time setting means 63 outputs a signal for setting the rice cooking time, and the rice cooking start means 64 outputs a signal for starting rice cooking. The control means 65 inputs the output signal of the cooking time setting means 63,
Moreover, when the output signal of the rice cooking start means 64 is input, the rice cooking is started, and at the same time, the counting of the cooking time set by the cooking time setting means 63 is started, and the output signal of the pot temperature detecting means 62 is input to the pot. Until the temperature of 60 exceeds a certain temperature, the heating means 61 is controlled to keep the duty ratio to the heating section constant, and after the temperature of the pot 60 exceeds a certain temperature, the heating means 61 is controlled to control the heating section. The electric power supply to the rice is reduced, and the rice cooking is controlled to be finished when the cooking time exceeds the cooking time set by the cooking time setting means 63.

Next, this operation will be described with reference to the flowchart of FIG.

That is, in step 70, the cooking time is set by the cooking time setting means 63. The control means 65 inputs the output signal of the cooking time setting means 63 and stores the cooking time. Next step
Proceed to 71. At step 71, the control means 65 receives the output signal from the rice cooking start means 64 and proceeds to step 72.
In step 72, the control means 65 measures the cooking time stored in step 70. Here, the elapsed time is subtracted from the set cooking time. When the output signal from the rice cooking start means 64 is not input in step 71, the process returns to step 70. Then go to step 73. In step 73, one minute 36
For a second, the heating part of the heating means 61 is not energized. Then go to step 74. In step 74, it is determined whether the remaining time obtained by subtracting the elapsed time from the cooking time set in step 70 is shorter than 4 minutes 48 seconds. If long, go to step 75. In step 75, the control means 65 determines whether the temperature of the pan 60 is higher or lower than 90 degrees by inputting the output signal of the pan temperature detecting means 62. If the temperature of the pot 60 is lower than 90 degrees, proceed to step 76. In step 76, the control means 65 controls the heating means 61 so that the duty ratio for energizing the heating part for heating the pot 60 is 12/16.
Then, the process returns to step 74. In step 74, the remaining time obtained by subtracting the elapsed time from the cooking time set in step 70 is 4
If it is shorter than 48 minutes, proceed to step 79. In step 79, the energization of the heating part of the heating means 61 is stopped for 4 minutes and 48 seconds, and then the process proceeds to the heat retention step of step 80. Then in step 75 the pot
If the temperature of 60 is higher than 90 degrees, proceed to step 77. In step 77, the control means 65 controls the heating means 61 to control the pan 60.
Set the energization rate to energize the heating part for heating to 2/16. This keeps the pot 60 temperature at 90 degrees,
Proceed to 78. In step 78, it is determined whether the remaining time obtained by subtracting the elapsed time from the cooking time set in step 70 is shorter than 4 minutes 48 seconds. If it is longer, the process proceeds to step 77, and the energization rate for energizing the heating unit that heats the pot 60 is set to 2/16. In step 78, if the remaining time obtained by subtracting the elapsed time from the cooking time set in step 70 is shorter than 4 minutes 48 seconds, step
Proceed to 79. In step 79, the power supply to the heating part of the heating means 61 is stopped for 4 minutes and 48 seconds, and then the heat retention step of step 80 is performed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, when the power supply voltage to the heating unit is low, the ambient temperature is low, and the cooking time is set to be short, the cooking time ends before the temperature of the pan reaches 90 degrees. However, there was a problem that I could not cook rice.

Furthermore, after the temperature of the pot reaches 90 degrees, the heating rate is set to 2/16 to keep the temperature of the pot at 90 degrees.
When the power supply voltage applied to the heating part is low and the ambient temperature is low, there is a problem that it is not possible to maintain 90 degrees and rice can not be cooked well.

The present invention is to solve the above conventional problems, the power supply voltage to the heating unit is low, the ambient temperature is low, even when the cooking time is set short, the temperature of the pan during the cooking time, to a certain temperature The first purpose is to control so that the rice can be cooked.

Furthermore, once the pot temperature reaches a certain temperature, the power supply voltage to the heating section is low, and even if the ambient temperature is low, the pot temperature can be controlled to maintain a certain temperature for cooking rice. The second purpose is to do so.

Means for Solving the Problems The first aspect of the present invention for achieving the first object of the present invention is to provide a heating means for energizing a pan for putting cooked rice and a heating part for heating the pan. A pot temperature detecting means for outputting a detection signal of the temperature of the pot, a cooking time setting means for outputting a signal for setting the cooking time, a cooking start means for outputting a signal for starting cooking rice, and the cooking time setting When the output signal of the means is input and the output signal of the rice cooking start means is input, rice cooking is started, and at the same time, the cooking time set by the cooking time setting means is started to control the heating means to heat the rice. After heating the pot for a certain period of time by energizing the pot at the maximum duty ratio, input the output signal of the pot temperature detection means and control the heating means until the temperature of the pot exceeds a certain temperature. To reduce the energization rate to the After the temperature of the pot exceeds a certain temperature, the heating means is controlled to further reduce the energization rate to the heating section, and the rice cooked when the cooking time exceeds the cooking time set by the cooking time setting means. And a control means for ending the.

Furthermore, the present invention provides a second means of the present invention for achieving the above-mentioned second object, a pan for putting cooked rice, a heating means for energizing a heating part for heating the pan, and a pan for the pan. The pot temperature detection means for outputting a temperature detection signal, the cooking time setting means for outputting a signal for setting the rice cooking time, the rice cooking start means for outputting a signal for starting rice cooking, and the output signal of the cooking time setting means When inputting the output signal of the rice cooking starting means, the rice cooking is started, and at the same time, the time counting of the cooking time set by the cooking time setting means is started,
After controlling the heating means and heating the pot for a certain period of time by energizing the heating section at the maximum duty ratio, the output signal of the pot temperature detecting means is input, and when the temperature of the pot is lower than a certain temperature, , Controlling the heating means to reduce the energization rate to the heating part, and when the temperature of the pot is higher than a certain temperature, control the heating means to stop energizing the heating part,
And a control means for ending the rice cooking when the rice cooking time exceeds the cooking time set by the cooking time setting means.

By the above first means, even if the power supply voltage to the heating section is low, the ambient temperature is low, and the cooking time is set to be short, the heating section can be energized at the maximum duty ratio to heat the pot for a certain period of time. Allows the pot temperature to reach a certain temperature during the set cooking time.

Furthermore, by the second means, even if the power supply voltage to the heating section is low and the ambient temperature is low, once the pot temperature reaches a certain temperature, the pot temperature is detected by the pot temperature detection means. However, when the temperature of the pot is lower than a certain temperature, the heating means is controlled to make the energization rate to the heating part smaller than the maximum energization rate, and when the temperature of the pot is higher than a certain temperature, the heating means is controlled. Then, the power supply to the heating section can be stopped, so that the temperature of the pot can be kept at a certain constant temperature.

Example One example of the present invention will be described below.

FIG. 1 is a block diagram of an embodiment of the present invention.

As shown in the figure, the pan 1 is for putting rice cooked therein, and the pan 1 is heated by energizing its heating portion by the heating means 2. The pot temperature detecting means 3 outputs a detection signal of the temperature of the pot 1, the cooking time setting means 4 outputs a signal for setting the rice cooking time, and the rice cooking start means 5 outputs a signal for starting the rice cooking. is there. When the control means 6 inputs the output signal of the cooking time setting means 4 and the output signal of the rice cooking start means 5, the rice cooking is started and at the same time, the counting of the cooking time set by the cooking time setting means 4 is started. , The heating means 2 is controlled, the heating portion is energized at the maximum duty ratio to heat the pan 1 for a certain time, and then the output signal of the pan temperature detecting means 3 is input until the temperature of the pan 1 exceeds a certain temperature. , The heating means 2 is controlled to reduce the energization rate to the heating part, and after the temperature of the pot 1 exceeds a certain temperature, the heating means 2
Is controlled to further reduce the energization rate to the heating unit, and the rice cooking is ended when the cooking time exceeds the cooking time set by the cooking time setting means 4.

Further, when the control means 6 inputs the output signal of the cooking time setting means 4 and the output signal of the rice cooking start means 5, the rice cooking is started and at the same time, the counting of the cooking time set by the cooking time setting means 4 is started. Then, the heating means 2 is controlled to energize the heating section at the maximum duty ratio to heat the pot 1 for a certain period of time, and then the output signal of the pot temperature detecting means 3 is input to make the temperature of the pot 1 higher than a certain temperature. When the temperature is low, the heating unit 2 is controlled to reduce the energization rate to the heating unit, and when the temperature of the pot 1 is higher than a certain temperature, the heating unit 2 is controlled to stop the energization to the heating unit. When the cooked rice time exceeds the cooking time set by the cooking time setting means 4, the cooked rice is finished.

Next, the circuit diagram of this embodiment will be described.

In FIG. 2, reference numeral 1 is a pan for putting cooked rice, and the heating means 2 for heating the pan 1 is composed of a heater 2a, a relay 2b, a transistor 2c and a resistor 2d. Heater 2a is pot 1
The heater 2a is connected to one side of the AC power supply 7. The other side of heater 2a is relay 2b
Is connected to one side of the contact. The other side of the contacts of the relay 2b is connected to one side of an AC power supply 7 connected to the DC power supply 8. One side of the coil of the relay 2b is connected to the DC power supply 8, the other side of the coil of the relay 2b is connected to the collector of the transistor 2c, the emitter of the transistor 2c is connected to the ground of the DC power supply 8 and the base of the transistor 2c is connected to the resistor 2d.
Is connected to one side and the output of the microcomputer 6. The other side of the resistor 2d is connected to the DC power supply 8. The pot temperature detecting means 3 outputs a detection signal of the temperature of the pot 1, and includes a thermistor 3a, a resistor 3b, an A / D converter 3c,
It is composed of a resistor 3d and a resistor 3e. One side of the thermistor 3a is connected to the DC power supply 8, the other side is connected to the resistor 3b, the other side of the resistor 3b is connected to the ground, and the thermistor 3a and the resistor 3b connect the A / D converter 3c to the pan 1 of the pan 1. The voltage corresponding to the temperature is input. Furthermore, the DC power supply 8 is on one side of the resistor 3d.
The other side of the resistor 3e is connected to the ground, the other side of the resistor 3e is connected to the ground, and the A / D conversion reference voltage is input to the A / D converter 3c by the resistors 3d and 3e. Furthermore, the output of the A / D converter 3c is input to the microcomputer 6,
The temperature data of the pot 1 is input.

The cooking time setting means 4 outputs a signal for setting the cooking time, and is composed of a switch 4a and a resistor 4b. One side of the switch 4a is connected to the DC power source 8, and the other side is connected to one side of the resistor 4b and the input part of the microcomputer 6. The other side of the resistor 4b is connected to ground. When the switch 4a is pressed, a high level signal is input to the input section of the microcomputer 6. The microcomputer 6 sets and stores the cooking time according to the number of times the high level signal is input. The rice cooking start means 5 outputs a signal for starting rice cooking and is composed of a switch 5a and a resistor 5b. One side of the switch 5a is connected to the DC power source 8, and the other side is connected to one side of the resistor 5b and the input part of the microcomputer 6. The other side of the resistor 5b is connected to the ground. When the switch 5a is pressed, a high level signal is input to the input section of the microcomputer 6. When this high level signal is input, the microcomputer 6 starts the rice cooking operation.

The operation of the above configuration will be described with reference to the flowcharts of FIGS. 3 and 4.

First, as shown in FIG. 3, in the switch 10, the cooking time setting means 4 sets the cooking time. That is, when the switch 4a is pressed, the microcomputer 6
A high-level signal is input to the input section of. In this example, if the number of inputs is one, the cooking time is increased by 1 hour, and from the next input, 30 minutes is added each time. Maximum cooking time is 4
It is time, and no more will be accepted. The micro-computer 6 stores this cooking time. Then proceed to step 11. In step 11, when the microcomputer 6 inputs the output signal from the rice cooking start means 5, step 12
Proceed to. That is, when the switch 5a is pressed, a high level signal is input to the input section of the microcomputer 6. When this high-level signal is input, the microcomputer 6 steps to start the rice cooking operation.
Go to 12. In step 12, the microcomputer 6 starts counting the cooking time stored in step 10. Here, the elapsed time is subtracted from the set cooking time. When the output signal from the rice cooking starting means 5 is not input in step 11, the process returns to step 10. From step 12, proceed to the next step 13. In step 13, for 1 minute and 36 seconds, the microcomputer 6 sets the output connected to the base of the transistor 2c to low level, turns off the transistor 2c, and does not pass the current to the coil of the relay 2b. This allows
The contact of the relay 2b is turned off and the heater 2a of the heating means 2 is not energized. Then go to step 14. In step 14, the microcomputer 6 sets the output part connected to the base of the transistor 2c to high impedance for 10 minutes, for example, to cause a current to flow to the base of the transistor 2c through the resistor 2d to turn on the transistor 2c, and to turn the coil of the relay 2b. An electric current is applied to the relay 2b to turn on the contact of the relay 2b so that the heater 2a of the heating means 2 is energized at a duty ratio of 16/16. As a result, even if the voltage of the AC power supply 7 that energizes the heater 2a is low, the ambient temperature is low, and the cooking time is set to a minimum of 1 hour, the temperature θ of the pan 1 is set to a certain temperature during the cooking time of 1 hour. ,
Here you can raise it to 90 degrees. Then proceed to step 15. In step 15, the microcomputer 6 determines whether the remaining time obtained by subtracting the elapsed time from the cooking time set in step 10 is shorter than 4 minutes 48 seconds. 4 minutes remaining
If it is longer than 48 seconds, go to step 16. In step 16,
The microcomputer 6 inputs the output signal of the A / D converter 3c of the pan temperature detecting means 3 and determines whether the temperature θ of the pan 1 is higher or lower than 90 degrees. When the temperature θ of the pot 1 is lower than 90 degrees, proceed to step 17. In step 17, the microcomputer 6 sets the output section connected to the base of the transistor 2c of the heating means 2 to high impedance for 12 seconds for 16 seconds, and supplies a current to the base of the transistor 2c through the resistor 2d to turn on the transistor 2c. Then, a current is passed through the coil of the relay 2b to turn on the contact of the relay 2b, the heater 2a of the heating means 2 is energized at a duty ratio of 12/16, and the process returns to step 15. In step 15, when the remaining time obtained by subtracting the elapsed time from the cooking time set in step 10 is shorter than 4 minutes 48 seconds, the process proceeds to step 20. In step 20, the microcomputer 6 sets the output section connected to the base of the transistor 2c of the heating means 2 to low level for 4 minutes and 48 seconds.
Turn off 2c and do not apply current to the coil of relay 2b. As a result, the contact of the relay 2b is turned off and the heater 2a of the heating means 2 is not energized. After this, the process proceeds to the heat retention process of step 21. Next, in step 16, when the temperature θ of the pot 1 is higher than 90 degrees, the process proceeds to step 18. In step 18, the microcomputer 6 sets the output part of the heating means 2 connected to the base of the transistor 2c to high impedance for 2 seconds during 16 seconds, and supplies a current to the base of the transistor 2c through the resistor 2d to turn on the transistor 2c. A current is passed through the coil of the relay 2b to turn on the contact of the relay 2b to energize the heater 2a of the heating means 2 at a duty ratio of 2/16, and the process proceeds to step 19. In step 19, the microcomputer 6 determines whether the remaining time obtained by subtracting the elapsed time from the cooking time set in step 10 is shorter than 4 minutes 48 seconds. When the remaining time obtained by subtracting the elapsed time from the cooking time is longer than 4 minutes and 48 seconds, the process proceeds to step 18 and the energization rate for energizing the heater 2a for heating the pan 1 is set to 2/16. In step 19, the remaining time obtained by subtracting the elapsed time from the cooking time set in step 10 is 4 minutes.
If it is shorter than 48 seconds, proceed to Step 20. In step 20, the microcomputer 6 turns off the contact of the relay 2b of the heating means 2 for 4 minutes and 48 seconds to stop energizing the heater 2a of the heating means 2. After this, the process proceeds to the heat retention step of step 80.

As described above, according to the present embodiment, even when the voltage of the AC power supply 7 that energizes the heating unit is low, the ambient temperature is low, and the cooking time is set to the minimum of 1 hour, the heating unit is kept for a certain period of time. Since it can be energized at the maximum energization rate, the temperature θ of the pan 1 can be raised to a certain temperature during the minimum cooking time of 1 hour, and the "porridge" rice cooking menu can be cooked well.

Next, the flowchart of FIG. 4 will be described. It should be noted that steps that perform the same operations as those in the flowchart of FIG. 3 are denoted by the same step numbers and description thereof is omitted.

That is, as shown in the figure, the process proceeds from step 14 to step 22. In step 22, the microcomputer 6 steps
It is determined whether the remaining time obtained by subtracting the elapsed time from the cooking time set in 10 is shorter than 4 minutes 48 seconds. 4 minutes remaining 48
If it is longer than the second, go to step 23. In step 23, the microcomputer 6 controls the A / D converter 3 of the pan temperature detecting means 3.
Input the output signal of c, and the temperature θ of pan 1 is higher than 90 degrees,
Determine if it is low. If the temperature θ of the pot 1 is lower than 90 degrees, proceed to step 24. In step 24, the microcomputer 6 sets the output part of the heating means 2 connected to the base of the transistor 2c to high impedance for 12 seconds for 16 seconds, and supplies a current to the base of the transistor 2c through the resistor 2d to turn on the transistor 2c. , A current is passed through the coil of the relay 2b to turn on the contact of the relay 2b, the heater 2a of the heating means 2 is energized at a duty ratio of 12/16, and the process returns to step 22. In step 22, when the remaining time obtained by subtracting the elapsed time from the cooking time set in step 10 is shorter than 4 minutes 48 seconds, the process proceeds to step 20. In step 20, the microcomputer 6 sets the output section connected to the base of the transistor 2c of the heating means 2 to low level for 4 minutes and 48 seconds.
Turn off 2c and do not apply current to the coil of relay 2b. As a result, the contact of the relay 2b is turned off and the heater 2a of the heating means 2 is not energized. After this, the process proceeds to the heat retention process of step 21. Next, when the temperature θ of the pot 1 is higher than 90 degrees in step 22, the process proceeds to step 25. In step 25, the microcomputer 6 sets the output section connected to the base of the transistor 2c of the heating means 2 to the low level to turn off the transistor 2c, and no current is passed through the coil of the relay 2b. As a result, the contact of the relay 2b is turned off and the heater 2a of the heating means 2 is not energized. Next, the process proceeds to step 22 and the above operation is repeated.

As described above, according to the present embodiment, even when the voltage of the AC power supply 7 that energizes the heating unit is low, the ambient temperature is low, and the cooking time is set to the minimum of 1 hour, the heating unit is kept for a certain period of time. Since the electricity can be supplied at the maximum electricity supply rate, the temperature θ of the pot 1 can be raised to a certain temperature during the minimum cooking time of 1 hour. Furthermore, once the temperature θ of the pan 1 reaches a certain temperature, the power supply voltage to the heating section is low, and the rice is cooked while controlling the temperature θ of the pan 1 to be a certain temperature even when the ambient temperature is low. You can cook rice with the "porridge" rice cooking menu.

In the operation explanation of one embodiment of the present invention, the relay is turned on for 10 minutes at the maximum duty ratio in step 14 of the flowcharts of FIGS. 3 and 4, but the point is that the minimum cooking time that can be set. Therefore, even if the voltage of the AC power supply 7 for energizing the heating portion is low and the ambient temperature is low, it is sufficient that the pot 1 has a certain temperature, and it does not have to be 10 minutes and may be any number of minutes. In step 16 of the flow chart of FIG. 3 and step 23 of the flow chart of FIG.
The temperature is the temperature at which the rice in the pan 1 gelatinizes,
Any temperature may be used so long as the food does not spill from the pan 1.

EFFECTS OF THE INVENTION As is clear from the above description of the embodiments, according to the rice cooker of the present invention, even when the power supply voltage to the heating unit is low, the ambient temperature is low, and the cooking time is set to be short, the heating unit is It is possible to heat the pot for a certain period of time by energizing it at the maximum duty ratio, then adjust the duty ratio at the temperature of the pot, and finish the cooking when the cooking time elapses, so the pot can be cooked during the set cooking time. The temperature of can reach a certain temperature, and the rice menu of "porridge" can be cooked well.

Further, according to the present invention, even if the power supply voltage applied to the heating unit is low and the ambient temperature is low, once the pot temperature reaches a certain temperature, the pot temperature is detected by the pot temperature detecting means. When the temperature of the pot is lower than a certain temperature, the heating means is controlled to make the energization rate to the heating section smaller than the maximum energization rate, and when the temperature of the pot is higher than a certain temperature, the heating means is controlled to heat it. Since the electricity to the parts can be stopped, the temperature of the pan can be kept at a certain constant temperature
I can cook rice well.

[Brief description of drawings]

FIG. 1 is a block diagram of a rice cooker according to an embodiment of the present invention, and FIG.
The figure is a circuit diagram of the rice cooker, FIGS. 3 and 4 are flowcharts showing the operation of the rice cooker respectively, FIG. 5 is a block diagram of a conventional rice cooker, and FIG. 6 shows the operation of the rice cooker. It is a flowchart. 1 ... pot, 2 ... heating means, 3 ... pot temperature detection means, 4
…… Cooking time setting means, 5 …… Cooking rice starting means, 6 ...
… Control means.

Claims (2)

[Claims] 1. A pot for putting cooked rice, a heating means for energizing a heating part for heating the pot, a pot temperature detecting means for outputting a detection signal of the temperature of the pot, and a signal for setting a cooking time. Cooking time setting means for outputting, rice cooking start means for outputting a signal to start cooking rice, and inputting the output signal of the cooking time setting means, and when the output signal of the rice cooking start means is input, rice cooking is started at the same time, After starting the measurement of the cooking time set by the cooking time setting means, controlling the heating means, energizing the heating part at the maximum duty factor to heat the pot for a certain time, and then the pot temperature detecting means. Input the output signal of, and control the heating means to reduce the energization rate to the heating section until the temperature of the pot exceeds a certain temperature, and after the temperature of the pot exceeds the certain temperature, the heating is performed. Control means to the heating section It was further reduced conductivities, rice cooker comprising a control means for terminating the cooking when the cooking time elapses cooking time set by said cooking time setting means. 2. A pot for putting cooked rice, a heating unit for energizing a heating unit for heating the pot, a pot temperature detecting unit for outputting a detection signal of the temperature of the pot, and a signal for setting a cooking time. When the cooking time setting means for outputting, the rice cooking start means for outputting a signal to start rice cooking, and the output signal of the cooking time setting means are input and the output signal of the rice cooking start means is input, the rice cooking is started at the same time. After starting the measurement of the cooking time set by the cooking time setting means, controlling the heating means, energizing the heating part at the maximum energization rate to heat the pan for a certain time, and then detecting the pan temperature When the temperature of the pot is lower than a certain temperature, the heating means is controlled to reduce the energization rate to the heating section, and when the temperature of the pot is higher than a certain temperature, the output signal of the unit is input. Heating by controlling heating means So as to stop energization of the rice cooker consisting includes when the rice time elapsed cooking time set by said cooking time setting means and control means for terminating the cooking.