JP6911036B2 - Cooker, control program and recording medium - Google Patents

Description

The present invention relates to a heating cooker that heats an object to be heated while stirring.

Conventionally, a heating cooker that stirs an object to be agitated such as a food material while heating it is known. As such a heating cooker, for example, Patent Document 1 discloses a rice cooker having a stirring body rotated by a rotating body arranged between a main body and a lid.

In a heating cooker having such a stirrer, the rotating body rotates the stirrer in a certain direction when a signal instructing stirring is given at regular intervals.

Japanese Patent Publication No. 2013-188292 (published on September 28, 2013)

In the above-mentioned cooking cooker, when the amount of the object to be agitated increases, the load of the motor for driving the agitating arm becomes large and the agitating arm may not rotate when the agitating arm hits the food material. .. This is because the power applied to achieve the target rotation amount differs depending on the amount of the agitated object. Therefore, in such a case, it is necessary to increase the power (torque) of the motor in order to rotate the stirring arm.

The present invention has been made in view of the above problems, and an object of the present invention is to suppress an increase in power of a motor for driving a stirring arm even if an object to be agitated increases.

In order to solve the above problems, the heating cooker according to one aspect of the present invention includes a stirring body that stirs the object to be heated, a motor that rotates the stirring body, and a plurality of the stirring bodies in a normal rotation direction. A motor control unit that controls the rotation of the motor so as to rotate is provided, the stirring body is provided separately from a pot for accommodating the object to be heated, and the motor control unit is loaded with the stirring body. When it is small, the rotation of the motor is controlled so that the stirring body rotates only in the normal rotation direction in each rotation, while when the load of the stirring body is large, the stirring body rotates in each rotation. , Rotates in the normal rotation direction, and rotates in the direction opposite to the normal rotation direction after the end of rotation in the normal rotation direction or before the start of rotation by an amount smaller than the amount of rotation in the normal rotation direction. It is characterized in that the rotation of the motor is controlled as described above.

According to one aspect of the present invention, it is possible to suppress an increase in the power of the motor that drives the stirring arm even if the amount of the object to be agitated increases.

It is a perspective view which shows the state which the lid body of the rice cooker which concerns on Embodiment 1 of this invention is closed. It is a perspective view which shows the state which the lid body of the rice cooker is opened. It is a perspective view which shows the stirring state by the 1st stirring arm and the 2nd stirring arm in the said rice cooker. It is a vertical cross-sectional view which shows the internal structure of the rice cooker. It is a block diagram which shows the structure of the control system of the rice cooker. It is a block diagram which shows the structure of the motor control system of the rice cooker. It is a waveform diagram which shows the concept of the rotation control of a motor by a motor control part in the said motor control system. It is a graph which shows the change of the power of a motor with respect to the number of times of stirring by comparing the stirring method by the rice cooker and the conventional stirring method. It is a block diagram which shows the structure of the motor control system which concerns on Embodiment 2 of the said rice cooker. It is a flowchart which shows the procedure of the power control of a motor by the motor control system of FIG. It is a graph which shows the change of the power of a motor with respect to the number of times of stirring by comparing the stirring method by the rice cooker which has the motor control system of FIG. 9 with the conventional stirring method. 9 is a waveform diagram showing a specific example of motor rotation control by a motor control unit in the motor control system of FIG. 9. It is a flowchart which shows the procedure of the actual rotation speed control of a motor by the motor control system of FIG. It is a block diagram which shows the structure of the heating control system which concerns on Embodiment 3 of the said rice cooker.

[Embodiment 1]
An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

FIG. 1 is a perspective view showing a state in which the lid 2 of the rice cooker 100 (heating cooker) according to the first embodiment is closed. FIG. 2 is a perspective view showing a state in which the lid of the rice cooker 100 is opened. FIG. 3 is a perspective view showing a stirring state of the rice cooker 100 by the first stirring arm 12A and the second stirring arm 12B. FIG. 4 is a vertical cross-sectional view showing the internal structure of the rice cooker 100. The structure of the rice cooker 100 will be described with reference to these figures.

As shown in FIG. 1, the rice cooker 100 includes a rice cooker main body 1 and a lid 2 attached to the upper part of the rice cooker main body 1. The rice cooker 100 is configured so that it can be used not only for cooking rice but also for cooking such as simmered dishes and steamed dishes.

An open button 3 for opening the lid 2 is provided on the front surface of the rice cooker main body 1. On the other hand, a plug provided at the end of the power cord 4 protrudes from the rear surface of the rice cooker main body 1. Most of the power cord 4 is wound around a cord reel (not shown) in the rice cooker body 1 so that it can be pulled out.

A liquid crystal display unit 5 for displaying a cooking method, a cooking name, and the like, and an operation unit 6 composed of a plurality of operation switches are provided on the front portion of the upper surface of the lid body 2. Further, the steam of the inner pot 7 shown in FIG. 2 is discharged from the steam discharge port 2a at the rear of the upper surface of the lid 2.

As shown in FIG. 2, the rice cooker main body 1 accommodates an inner pot 7, and the inner pot 7 is opened and closed by the lid 2.

A locked portion 8 is provided on the front portion of the upper surface of the rice cooker main body 1. A locking portion 23 provided on the front portion of the lower surface of the lid 2 is leasably locked to the locked portion 8. When the open button 3 is pressed, the locked portion 8 moves rearward, and the locked portion 23 is released from being locked to the locked portion 8.

An induction coil 10 for inducing heating the inner pot 7 is installed in the rice cooker main body 1. The induction coil 10 is an example of a heating unit.

Rice, water, etc. as an example of the contents are stored in the inner pot 7. The inner pot 7 is made of a highly heat conductive material such as aluminum. A magnetic material such as stainless steel, which improves heating efficiency, is attached to the outer surface of the inner pot 7. On the other hand, the inner surface of the inner pot 7 is coated with a fluororesin to prevent the contents from adhering.

The lid 2 has an outer lid 21 located on the side opposite to the inner pot 7 side when the lid 2 is closed, and an inner lid 22 located on the inner pot 7 side when the lid 2 is closed. is doing. A motor 24 is arranged in the right corner of the rear part of the outer lid 21. A connecting shaft (not shown) is rotatably arranged on the inner lid 22. The connecting shaft rotates by receiving the rotational driving force generated by the motor 24 via a pulley or belt (not shown).

A stirring unit 50 is rotatably attached to the lid 2. The stirring unit 50 is rotated by the driving force of the motor 24 to stir the contents contained in the inner pot 7.

As shown in FIGS. 2 and 3, the stirring unit 50 has a rotating body 11 and a first stirring arm 12A and a second stirring arm 12B as stirring bodies.

The rotating body 11 is rotatably attached to the lid body 2. The first stirring arm 12A and the second stirring arm 12B are swingably attached to the rotating body 11 and are arranged so as to sandwich the rotating body 11.

The first stirring arm 12A and the second stirring arm 12B are arranged along the side surface of the rotating body 11 in a non-stirring state (see FIG. 2) and in a stirring state extending vertically from the non-stirring state (see FIG. 3). Is rotatably attached to the rotating body 11 so as to be switchable between and. In the stirred state, the first stirring arm 12A and the second stirring arm 12B extend toward the inner pot 7 as shown in FIG. 3, and therefore come into contact with rice or the like in the inner pot 7.

As shown in FIG. 4, a lid heater 13 for heating the inner lid 22 is provided on the upper surface side of the inner lid 22. Further, on the outer surface of the inner pot 7, a heat retaining heater 14 for keeping heat of the object to be heated in the inner pot 7 is provided. Further, the induction coil 10 described above is arranged directly below the bottom of the inner pot 7. A temperature sensor 15 for detecting the temperature of the inner pot 7 is provided in the space on the inner peripheral side of the induction coil 10. The temperature sensor 15 is a sensor for detecting the temperature of the inner pot 7, and is composed of, for example, a thermistor. The temperature sensor 15 is arranged so as to come into contact with the bottom of the inner pot 7.

Subsequently, the control system of the rice cooker 100 will be described. FIG. 5 is a block diagram showing a configuration of a control system of the rice cooker 100. FIG. 6 is a block diagram showing a configuration of a motor control system of the rice cooker 100.

As shown in FIG. 5, the rice cooker 100 includes a CPU (Central Processing Unit) 16, a ROM (Read Only Memory) 17, and a RAM (Random Access Memory) 18 as main parts of the control system. Further, the rice cooker 100 includes a motor drive circuit 19 for driving the motor 24 and an FG sensor 20 for detecting the rotation of the motor 24.

The CPU 16 controls each unit by executing a control program stored in the ROM 17. Specifically, the CPU 16 controls the display of the display unit 5, accepts operations to the operation unit 6, turns on / off the induction coil 10, the lid heater 13, and the heat retaining heater, and controls the temperature, and controls the drive of the motor drive circuit 19. And so on.

An FG sensor 20 is attached to the motor 24. For example, 360 FG (Frequency Generator) teeth magnetized so that N poles and S poles are alternately arranged are provided on the outer circumference of a rotor included in a motor 24 composed of a DC motor. The FG sensor 20 is a magnetic sensor such as a Hall element or an MR sensor that detects a magnetic field generated by the rotation of the rotor, and outputs a pulsed FG signal.

The CPU 16 measures the period (FG value) of the FG signal and outputs the PWM signal so as to reach the target FG value. Further, the CPU 16 outputs an on / off signal for turning on / off the motor 24 and a rotation direction signal for specifying the rotation direction of the motor 24.

The motor drive circuit 19 rectifies the PWM signal to generate a DC voltage applied to the motor 24. Further, the motor drive circuit 19 drives and stops the motor 24 based on the on / off signal. Further, the motor drive circuit 19 rotates the motor 24 in the forward direction or in the reverse direction based on the rotation direction signal.

As shown in FIG. 6, the rice cooker 100 includes a motor control unit 25. The motor control unit 25 is a part that realizes the motor control function of the CPU 16, and outputs the above-mentioned PWM signal, on / off signal, and rotation direction signal. Further, the motor control unit 25 includes a normal rotation control unit 26 and an irregular rotation control unit 27. The normal rotation control unit 26 operates in the normal stirring mode, and the irregular rotation control unit 27 operates in the irregular stirring mode.

In the normal stirring mode, when the load of the first stirring arm 12A and the second stirring arm 12B is small, for example, when the weight of the object to be heated is smaller than a predetermined value, or when a light load cooking menu such as boiled noodles is selected. Applies when In the irregular stirring mode, when the load of the first stirring arm 12A and the second stirring arm 12B is large, for example, when the weight of the object to be heated is equal to or more than a predetermined value, or when the amount of the object to be heated is increased in the cooking menu such as simmered food. Applies when The magnitude of the load can also be measured by the value of the current flowing through the motor 24. The weight of the object to be heated can be measured, for example, by providing a weight sensor (not shown) at the bottom of the inner pot 7.

In the normal rotation control unit 26 and the irregular rotation control unit 27, the normal stirring mode is applied or irregular according to the instruction contents (designation of the cooking menu, instruction for increasing the amount of the object to be heated, etc.) input to the operation unit 6. It operates by appropriately determining whether the stirring mode is applied. In both the normal stirring mode and the irregular stirring mode, the rotation of the first stirring arm 12A and the second stirring arm 12B is performed at a predetermined number of times within a predetermined time and at a predetermined rotation amount at each rotation according to the cooking menu. It is predetermined that it will be done.

The normal rotation control unit 26 rotates the motor 24 in the forward direction so as to rotate the first stirring arm 12A and the second stirring arm 12B a specified number of times in the stirring direction (regular rotation direction).

Similar to the normal rotation control unit 26, the irregular rotation control unit 27 rotates the motor 24 in the forward direction so as to rotate the first stirring arm 12A and the second stirring arm 12B a specified number of times in the stirring direction. Further, in the irregular rotation control unit 27, in addition to the basic rotation control as described above, in each rotation, the first stirring arm 12A and the second stirring arm 12B end or start rotating in the normal rotation direction. The motor 24 is rotated in the opposite direction after the end of the rotation in the normal rotation direction and before the start so that the motor 24 rotates slightly in the rotation direction opposite to the normal rotation direction.

The operation of the rice cooker 100 configured as described above in the normal stirring mode and the irregular stirring mode will be described. FIG. 7 is a waveform diagram showing the concept of rotation control of the motor 24 by the motor control unit 25 in the motor control system. FIG. 8 is a graph showing a change in the power of the motor 24 with respect to the number of times of stirring by comparing the stirring method by the rice cooker 100 and the conventional stirring method.

In the normal stirring mode, the normal rotation control unit 26 operates to output a PWM signal, an on / off signal, and a forward rotation rotation direction signal from the normal rotation control unit 26. The motor drive circuit 19 rotates the motor 24 according to a specified time, the number of rotations, and the amount of rotation based on these signals.

In the normal stirring mode, the load applied to the first stirring arm 12A and the second stirring arm 12B is small. Therefore, even if the first stirring arm 12A and the second stirring arm 12B rotate only in the positive direction from the state where the first stirring arm 12A and the second stirring arm 12B are in contact with the object to be heated, the load on the motor 24 is small. The stirring arm 12B can be rotated.

In the irregular stirring mode, the irregular rotation control unit 27 operates to output a PWM signal, an on / off signal, and a reverse rotation / forward rotation rotation direction signal from the irregular rotation control unit 27. The motor drive circuit 19 rotates the motor 24 according to a specified time, the number of rotations, and the amount of rotation based on these signals. As shown in FIG. 7, the motor 24 rotates in the forward direction (forward rotation) and then in the reverse direction in each rotation. Alternatively, as shown by the broken line in FIG. 7, the motor 24 rotates in the reverse direction before the forward rotation in each rotation.

As a result, the first stirring arm 12A and the second stirring arm 12B rotate slightly in the opposite direction from the state of being in contact with the object to be heated after or before each regular rotation. Therefore, at the start of rotation in the positive direction, the load on the motor 24 is reduced because the first stirring arm 12A and the second stirring arm 12B do not hit the object to be heated. Then, the first stirring arm 12A and the second stirring arm 12B rotate slightly in the positive direction and then hit the object to be heated. Therefore, even when the amount of the object to be heated increases and the load of the motor 24 increases, the first stirring arm 12A and the second stirring arm 12B can be rotated according to the target without increasing the power of the motor 24. can.

Here, in the case where the object to be heated is agitated 10 times by the first agitation arm 12A and the second agitation arm 12B, the change in power with respect to the number of agitation is changed between the agitation method according to the present embodiment and the conventional agitation method (regular rotation direction). Only rotation) will be explained in comparison with. Next, I will explain using a relatively large amount of meat potatoes (simmered meat and potatoes) for 6 people as the object to be heated, and fixing the target stirring amount (target rotation amount) at one time to a constant level. This is an example.

In the stirring method of the present embodiment, as shown by the solid line in FIG. 8, the target rotation amount is reached by stirring four times or later, and the power of the motor 24 becomes substantially constant. In the stirring up to 4 times, it is necessary to gradually increase the power of the motor 24 so as to reach the target stirring amount. Further, in the stirring after 5 times, the effect of rotating the motor 24 in the reverse direction after (or in front of) the forward rotation appears, and the increase in the power of the motor 24 can be suppressed.

On the other hand, in the conventional stirring method, as shown by the broken line in FIG. 8, the power of the motor 24 is increased in the stirring up to 4 times as in the stirring method of the present embodiment. However, the power of the motor 24 is increased even in the subsequent stirring up to 9 times, and the target rotation amount is finally reached in the 9th stirring, and the power of the motor 24 becomes constant. The power of the motor 24 is increased up to 9 times of stirring because in each stirring, the first stirring arm 12A and the second stirring arm 12B rotate in the stirring direction from the state where the first stirring arm 12A and the second stirring arm 12B are in contact with the object to be heated. Due to the heavy load.

If the stirring method of the present embodiment is adopted, as shown in FIG. 8, the power of the motor 24 that reaches the target rotation amount can be significantly reduced by the power difference ΔP as compared with the conventional stirring method.

The amount of rotation (rotation angle) of the motor 24 during reverse rotation may be a predetermined ratio to the amount of rotation during forward rotation, or may be a fixed amount of rotation.

Further, in the present embodiment, two first stirring arms 12A and a second stirring arm 12B are used as the stirring body, but one or three or more stirring arms may be used.

Further, in the present embodiment, the normal stirring mode and the irregular stirring mode are used properly, but the irregular stirring mode may be fixedly used as the normal stirring operation mode.

Further, in the present embodiment, the rice cooker 100 has been described, but the rotation control of the first stirring arm 12A and the second stirring arm 12B as described above is also applied to the cooking cooker that does not have the rice cooking function. Can be done. Embodiments 2 and 3, which will be described later, can also be applied to a cooking cooker that does not have such a rice cooking function.

[Embodiment 2]
Other embodiments of the present invention will be described below with reference to FIGS. 9 to 13. For convenience of explanation, the same reference numerals will be added to the components having the same functions as the components described in the first embodiment, and the description thereof will be omitted.

FIG. 9 is a block diagram showing a configuration of a motor control system according to the second embodiment of the rice cooker 100.

The rice cooker 100 according to the present embodiment includes the motor control unit 31 shown in FIG. 9 in place of the motor control unit 25 described above. The motor control unit 31 is a part that realizes the motor control function of the CPU 16 (see FIG. 5), and outputs the above-mentioned PWM signal, on / off signal, and rotation direction signal. Further, the motor control unit 31 has a rotation amount comparison unit 32 (rotation amount determination unit) and a power change unit 33.

The rotation amount comparison unit 32 compares the target FG value FGt determined based on the cooking menu or the like with the actually measured FG value FGm measured by the motor control unit 31 based on the FG signal from the FG sensor 20. The target rotation amount of the motor 24 is compared with the actual rotation amount. Further, the rotation amount comparison unit 32 outputs a power change instruction signal for instructing a power change when the difference between the target FG value FGt and the actually measured FG value FGm is equal to or greater than a predetermined value. Further, the rotation amount comparison unit 32 outputs a normal power instruction signal in which the power is the normal power when the difference between the target FG value FGt and the actually measured FG value FGm is less than a predetermined value.

Upon receiving the power change instruction signal from the rotation amount comparison unit 32, the power change unit 33 sets the power of the motor 24 to a predetermined value according to the difference between the target FG value FGt and the actually measured FG value FGm in the next rotation. Change to a predetermined PWM value). Further, when the normal power instruction signal from the rotation amount comparison unit 32 is received, the power of the motor 24 is set as the normal power in the next rotation. When the power change unit 33 receives the power change instruction signal, it changes the rotation time of the motor 24 to a predetermined value according to the power change instruction signal in the next rotation, and when it receives the normal power instruction signal, the next time. Let the rotation time of the motor 24 be the time at the time of normal power in the rotation from. Further, when the power change unit 33 receives the power change instruction signal, the rotation time of the motor 24 is the same in the next rotation, and the current value flowing through the motor 24 is changed to a predetermined value according to the power change instruction signal. May be (PAM control).

The operation of changing the power of the motor 24 by the motor control unit 31 configured as described above will be described with reference to FIG. FIG. 10 is a flowchart showing a procedure of power control of the motor 24 by the motor control system.

As shown in FIG. 10, first, the rotation amount comparison unit 32 compares the target FG value FGt with the actually measured FG value FGm (step S1). The rotation amount comparison unit 32 determines by comparison whether the difference between the two is less than the first predetermined value D1, the first predetermined value D1 or more and the second predetermined value D2 or less, or the second predetermined value D2 or more. (Step S2). Here, the second predetermined value D2 is a value larger than the first predetermined value D1.

When the rotation amount comparison unit 32 determines that the difference between the two is equal to or greater than the first predetermined value D1 and less than the second predetermined value D2, the power change unit 33 changes the power in the next rotation by a small amount (a small amount of change from the current value). A PWM signal is output to the motor drive circuit 19 so as to change only the first change amount). By being driven by the motor drive circuit 19 based on the PWM signal, the motor 24 rotates with the changed power with a small amount of change in the next rotation (step S3). For example, when the actually measured FG value FGm is smaller than the first predetermined value D1 and less than the second predetermined value D2 with respect to the target FG value FGt, the motor 24 increases the power. On the contrary, when the measured FG value FGm is larger than the above value with respect to the target FG value FGt, the motor 24 attenuates the power.

In step S2, when the rotation amount comparison unit 32 determines that the difference between the two is equal to or greater than the second predetermined value D2, the power change unit 33 changes the power in the next rotation by a large amount (second change) from the current value. A PWM signal is output to the motor drive circuit 19 so as to change only the amount). Here, the second change amount is a value larger than the first change amount. In step 3, the motor 24 is driven by the motor drive circuit 19 based on the PWM signal, so that the motor 24 rotates with the changed power with a large amount of change in the next rotation (step S4).

In step S2, when the rotation amount comparison unit 32 determines that the difference between the two is less than the first predetermined value D1, the power change unit 33 drives the motor so that the power of the motor 24 in the next rotation becomes the normal power. A PWM signal is output to the circuit 19. The motor 24 is driven by the motor drive circuit 19 based on the PWM signal, so that the motor 24 rotates with normal power in the next rotation (step S5).

After step S3, step S4 or step S5, the rotation amount comparison unit 32 determines whether or not the specified number of rotations has been completed (step S6). When the rotation amount comparison unit 32 determines that the rotation of the specified number of times has been completed (YES), the process is completed, while when it is determined that the rotation of the specified number of times has not been completed (NO), the process of step S1 is performed again.

As described above, in the motor control unit 31, the difference between the measured rotation amount per stirring of the first stirring arm 12A and the second stirring arm 12B (motor 24) and the target rotation amount is a predetermined value (first predetermined value). ) When the above, the amount of change in power and time to be changed in the next rotation in the direction in which the measured rotation amount approaches the target rotation amount is changed according to the magnitude of the above difference. Specifically, the motor control unit 31 increases the above-mentioned change amount when the actually measured rotation amount is different from the target rotation amount, and decreases the above-mentioned change amount when the actually measured rotation amount approaches the target rotation amount (). The motor 24 is controlled so as to return to normal).

As a result, even if the weight of the object to be heated increases, the first stirring arm 12A and the second stirring arm 12B start rotating faster, and after reaching the target rotation amount, the target rotation amount does not deviate significantly. You can maintain the front and back. Therefore, even if the weight range of the object to be heated is expanded, by causing the first stirring arm 12A and the second stirring arm 12B with the power and time suitable for each amount, as shown in FIG. 11, in a short time. You will be able to reach and maintain the target rotation amount.

FIG. 11 is a graph showing a change in the power of the motor 24 with respect to the number of times of stirring by comparing the stirring method by the rice cooker 100 and the conventional stirring method. FIG. 11 shows an example in which a relatively large amount of meat and potato material for 6 people is used as an object to be heated. Further, the conventional stirring method is an example in which the power is changed by a constant value regardless of the difference between the measured rotation amount and the target rotation amount.

As shown in FIG. 11, in the stirring method of the present embodiment, as shown by the solid line, the target power is reached at time T1. On the other hand, in the conventional stirring method, as shown by the broken line, the target power is finally reached in T2, which is significantly longer than the time T1. As described above, according to the stirring method of the present embodiment, the time required to reach the target rotation amount can be significantly shortened as compared with the conventional disturbance method.

Here, a specific example of control of the motor 24 according to the difference between the target rotation amount and the actually measured rotation amount by the motor control unit 31 will be described. FIG. 12 is a waveform diagram showing a specific example of rotation control of the motor 24 by the motor control unit 31 in the motor control system. FIG. 12 shows an example in which the power of the motor 24 is changed according to the difference in the measured rotation amount with respect to the target rotation amount without changing the rotation time of the motor 24. Not limited to this example, the rotation time may be changed according to the difference in the measured rotation amount with respect to the target rotation amount without changing the power of the motor 24.

As shown in FIG. 12, when the measured rotation amount is smaller than the target rotation amount, the motor control unit 31 increases the power of the motor 24 according to the difference between the target rotation amount and the measured rotation amount in the next rotation. On the other hand, when the measured rotation amount is larger than the target rotation amount, the motor control unit 31 attenuates the power of the motor 24 according to the difference between the target rotation amount and the measured rotation amount in the next rotation. In this way, the motor control unit 31 controls the power of the motor 24 so that the measured rotation amount approaches the target rotation amount. Further, when the measured rotation amount is equal to the target rotation amount, the motor control unit 31 maintains the power of the motor 24 in the next rotation.

For example, as the cooking progresses, the object to be heated becomes soft, or the object to be heated such as jam is boiled and becomes hard due to an increase in viscosity. When the object to be heated becomes soft, the load on the motor 24 becomes lighter and it becomes easier to rotate, so that the measured rotation amount becomes larger than the target rotation amount. In this case, the power of the motor 24 is controlled to be attenuated in the next rotation. On the other hand, when the object to be heated becomes hard, the load on the motor 24 becomes heavy and it becomes difficult to rotate, so that the measured rotation amount becomes smaller than the target rotation amount. In this case, the power of the motor 24 is controlled to increase in the next rotation.

By the way, in the process shown in FIG. 10, regardless of whether or not the motor 24 has actually rotated, the rotation amount comparison unit 32 is a programmatic process, and it is determined in step S6 that the motor 24 has completed the specified number of rotations. Then it ends. However, even if the first stirring arm 12A and the second stirring arm 12B try to rotate the same number of times within a predetermined time, the number of times the first stirring arm 12A and the second stirring arm 12B actually rotate at the target rotation amount depends on the load (weight of the object to be heated). different. Therefore, when the load is small, the agitation is excessive, and conversely, when the load is large, the agitation is insufficient.

In addition, when the object to be heated is large (heavy), even if the power in the next rotation is increased so as to reach the target rotation amount as soon as possible, the target rotation amount is finally reached in several rotations, so that the object to be heated reaches the target rotation amount. There is a difference in the actual number of rotations (stirring) as compared with the case where the number is small (light). For example, when the first stirring arm 12A and the second stirring arm 12B are rotated 30 times in a heating time of 5 minutes, and when there are many objects to be heated, the motor control unit 31 rotates as quickly as possible by the above process. Control as much as possible. However, if the first stirring arm 12A and the second stirring arm 12B cannot rotate according to the target rotation amount in the first few rotations, they cannot rotate correctly 30 times.

In order to eliminate such inconvenience, the motor control unit 31 further includes a rotation speed counting unit 34 (rotation speed counting unit) and a rotation speed comparing unit 35.

When the rotation speed counting unit 34 determines that the target FG value FGt and the measured FG value FGm match, it determines that the motor 24 has normally rotated once, and sets the count rotation speed Nc (counting value) to 1. In addition, the number of rotations in which the motor 24 is normally rotated is counted.

The rotation speed comparison unit 35 compares the predetermined rotation speed Nt and the count rotation speed Nc, which are predetermined according to the cooking menu and the like. Further, the rotation speed comparison unit 35 outputs an off signal to the power change unit 33 so as to stop the motor 24 when the two match. Further, the rotation speed comparison unit 35 outputs an on signal to the power change unit 33 so as to cause the motor 24 to rotate next time when the two do not match.

The operation of controlling the actual rotation speed of the motor 24 by the motor control unit 31 configured as described above will be described with reference to FIG. FIG. 13 is a flowchart showing a procedure for controlling the actual rotation speed of the motor 24 by the motor control unit 31.

As shown in FIG. 13, first, the rotation speed counting unit 34 sets the count rotation speed Nc to 0 (step S11). Next, the rotation amount comparison unit 32 compares the target FG value FGt with the actually measured FG value FGm (step S12), and determines whether or not they match (step S13). When the rotation amount comparison unit 32 determines that the two match (YES), the rotation speed counting unit 34 adds 1 to the count rotation speed Nc (step S14).

Subsequently, the rotation speed comparison unit 35 compares the specified rotation speed Nt with the count rotation speed Nc (step S15), and determines whether or not they match (step S16). When the rotation speed comparison unit 35 determines that the two match (YES), it determines that the motor 24 rotates the target rotation amount each time and finishes the rotation of the specified rotation speed Nt. As a result, the power changing unit 33 stops the rotation of the motor 24 (step S17), and the stirring operation ends. After that, it shifts to the next cooking stage as needed.

Further, when the rotation amount comparison unit 32 determines in step S13 that the target FG value FGt and the actually measured FG value FGm do not match, the process shifts to step S15.

Then, when the rotation speed comparison unit 35 determines in step S16 that the two do not match, the process shifts to step S12, and in the next rotation, the rotation amount comparison unit 32 has the target FG value FGt and the measured FG value FGm. Compare with.

In this way, the motor control unit 31 determines whether or not the measured rotation amount at each rotation of the motor 24 has reached the target rotation amount. Further, the motor control unit 31 regards the rotation at which the measured rotation amount reaches the target rotation amount as a normal rotation, and maintains the rotation operation until the rotation speed of the normal rotation reaches the specified rotation speed Nt. To control. As a result, it is possible to unify the number of times of normal rotation according to the target to the specified number of rotations Nt, not the number of times of attempted rotation. Therefore, even if the amounts of the objects to be heated are different, the total amount of stirring can be adjusted to the same level without causing a difference in the degree of stirring.

In step S13 described above, the rotation amount comparison unit 32 determines whether the target FG value FGt and the measured FG value FGm match or do not match, and the measured FG value FGm is a predetermined ratio of the target FG value FGt (for example, 70%). ) May be determined. In such a judgment, even if the target FG value FGt and the measured FG value FGm do not match, if the measured FG value FGm is close to the target FG value FGt to some extent, it is permissible that one stirring can be performed as the target. Applicable when possible.

Further, even if the rotation amount comparison unit 32, the power change unit 33, the rotation speed counting unit 34, and the rotation speed comparison unit 35 of the motor control unit 31 are incorporated as the functions of the irregular rotation control unit 27 of the motor control unit 25 in the first embodiment. good.

[Embodiment 3]
Another embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, the same reference numerals will be added to the components having the same functions as the components described in the first and second embodiments, and the description thereof will be omitted.

FIG. 14 is a block diagram showing a configuration of a heating control system according to the third embodiment of the rice cooker 100.

As shown in FIG. 14, the rice cooker 100 according to the present embodiment includes a heating control unit 41. The heating control unit 41 is a part that realizes the heating control function of the CPU 16 (see FIG. 5), and turns on the heat retaining heater 14 and the induction coil 10 based on the temperature of the inner pot 7 detected by the temperature sensor 15. -Control off and temperature. Therefore, the heating control unit 41 has a temperature rise measuring unit 42 and a temperature rise determining unit 43.

The rising temperature measuring unit 42 measures the rising temperature ΔT of the inner pot 7 during a predetermined time from the start of heating based on the detected temperature of the temperature sensor 15.

The temperature rise determination unit 43 determines that the amount of the object to be heated is small when the rise temperature ΔT is equal to or higher than a predetermined temperature, and controls to turn off the heat retention heater 14 at the time of heat retention.

As a result, it is possible to prevent the object to be heated from being boiled or overheated, and to prevent the side surface of the inner pot 7 from being scorched or sticking. In addition, unnecessary power is not consumed, which contributes to power saving. Further, when the temperature rise determination unit 43 determines that the amount of the object to be heated is small during heat retention, the heat retention heater 14 arranged on the side surface of the inner pot 7 is turned off, and the induction coil 10 arranged on the bottom surface of the inner pot 7 is turned off. Turn on to keep warm.

In the present embodiment, the configuration in which the heat retaining heater 14 is provided on the side surface of the inner pot 7 and the induction coil 10 is provided on the bottom surface of the inner pot 7 has been described. On the other hand, the heating means may have a configuration in which heaters are provided on both the side surface and the bottom surface of the inner pot 7, or a configuration in which induction coils are provided on both the side surface and the bottom surface of the inner pot 7.

[Example of realization by software]
The control block of the rice cooker 100 (particularly, the motor control unit 31 and the heating control unit 41) may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or software using the CPU 16. It may be realized by.

In the latter case, the rice cooker 100 is a CPU 16 that executes instructions of a program that is software that realizes each function, a ROM 17 in which the program and various data are readablely recorded by a computer (or CPU), or a storage device (these are stored). It is provided with a "recording medium"), a RAM 18 for developing the above program, and the like. Then, the computer (or CPU 16) reads (loads) the program from the recording medium and executes it, thereby achieving the object of the present invention. As the recording medium, a "non-temporary tangible medium", for example, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. Further, the program may be supplied to the computer via an arbitrary transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the above program is embodied by electronic transmission.

〔summary〕
In the heating cooker according to the first aspect of the present invention, the stirring body (first stirring arm 12A and the second stirring arm 12B) for stirring the object to be heated, the motor 24 for rotating the stirring body, and the stirring body are regular. The motor control units 25 and 31 are provided to control the rotation of the motor 24 so as to rotate the motor 24 a plurality of times in the rotation direction of the above. The rotation of the motor is controlled so as to rotate in the direction opposite to the normal rotation direction after the end of the rotation in the direction or before the start of the rotation.

According to the above configuration, the agitator is rotated in the normal rotation direction after being slightly rotated in the opposite direction from the state of being in contact with the object to be heated when the previous rotation is completed. As a result, in each rotation, at the start of rotation in the normal direction, the agitator is separated from the object to be heated, so that the load on the motor is reduced. Then, the agitator rotates a little in the normal rotation direction and then hits the object to be heated, so that the power of the motor can be suppressed as compared with the rotation in the normal rotation direction from the beginning of the rotation.

In the heating cooker according to the second aspect of the present invention, in the first aspect, the motor control unit 31 rotates next time when the difference between the target rotation amount and the actually measured rotation amount of the motor 24 is equal to or more than a predetermined value. The power of the motor in the above may be changed by the amount of change according to the difference.

According to the above configuration, when the difference between the measured rotation amount of the motor and the target rotation amount is large, the amount of change in the power of the motor can be increased in the next rotation so as to approach the target rotation amount quickly. As a result, even when the amount of the object to be heated is large, the target power can be reached in a shorter time.

In the heating cooker according to the third aspect of the present invention, in the above aspect 1 or 2, the motor control unit 31 determines whether or not the measured rotation amount in one rotation of the motor has reached the target rotation amount. The rotation amount determination unit further includes a rotation number counting unit that counts the number of rotations that the motor normally rotates when the measured rotation amount reaches the target rotation amount, and the rotation number counting unit The rotational operation of the motor may be maintained until the count value reaches the specified number of rotations Nt.

According to the above configuration, it is possible to unify the number of times the target rotation amount is normally rotated to the specified number of rotations Nt, not the number of times the rotation is attempted. Therefore, even if the amounts of the objects to be heated are different, the total amount of stirring can be adjusted to the same level without causing a difference in the degree of stirring.

The cooking cooker according to each aspect of the present invention may be realized by a computer. In this case, the cooking cooker is made into a computer by operating the computer as each part (software element) included in the cooking cooker. The control program of the cooker and the computer-readable recording medium on which the control program is recorded are also included in the scope of the present invention.

[Additional notes]
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

12A 1st stirring arm (stirring body)
12B 2nd stirring arm (stirring body)
24 Motor 25, 31 Motor control unit 27 Irregular rotation control unit 32 Rotation amount comparison unit (rotation amount determination unit)
33 Power change unit 34 Rotation speed counting unit (Rotation speed counting unit)
35 Rotation speed comparison unit 100 Rice cooker (heating cooker)
Nc count rotation speed (count value)
Nt specified rotation speed

Claims (5)

A stirrer that stirs the object to be heated and
A motor that rotates the stirrer and
A motor control unit that controls the rotation of the motor so that the stirring body rotates a plurality of times in a regular rotation direction is provided.
The agitator is provided separately from the pot that houses the object to be heated.
When the load of the stirrer is small, the motor control unit controls the rotation of the motor so that the stirrer rotates only in the normal rotation direction in each rotation, while the load of the stirrer increases. If it is large, the stirrer rotates in the normal rotation direction in each rotation, and after the rotation in the normal rotation direction ends or before the rotation starts, the stirrer rotates in the direction opposite to the normal rotation direction. A heating cooker characterized in that the rotation of the motor is controlled so as to rotate by an amount smaller than the amount of rotation in the rotation direction. The motor control unit is characterized in that when the difference between the target rotation amount of the motor and the actually measured rotation amount is equal to or more than a predetermined value, the power of the motor in the next rotation is changed by the amount of change according to the difference. The heating cooker according to claim 1. The motor control unit
A rotation amount determination unit that determines whether or not the measured rotation amount in one rotation of the motor has reached the target rotation amount, and a rotation amount determination unit.
Further, it has a rotation speed counting unit that counts the number of rotations that the motor has normally rotated when the measured rotation amount reaches the target rotation amount.
The heating cooker according to claim 1 or 2, wherein the rotational operation of the motor is maintained until the count value of the rotation speed counting unit reaches a specified rotation speed. A control program for operating a computer as a heating cooker according to any one of claims 1 to 3, wherein the computer functions as a motor control unit. A computer-readable recording medium on which the control program according to claim 4 is recorded.

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