JP2015105759A - Fuel gas amount control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel gas amount control device which can sufficiently simplify a control constitution, can accurately operate and move a movable plate, and is advantageous in terms of manufacturing.SOLUTION: When a setting start condition is satisfied in the case that a motor control part U for controlling the operation of a stepping motor 18 in order to change a gas flow opening to a target flow opening rotates an output shaft for changing the flow opening to the target flow opening in a direction reverse to a reference rotation direction, the output shaft drives the stepping motor 18 toward a rotation direction in which the stepping motor rotates to a direction reverse to the reference rotation direction at an initial pulse number which is obtained by adding a preset overdriving pulse number to a target pulse number, and after that, the output shaft performs high-accuracy drive processing for driving the stepping motor 18 toward a rotation direction in which the stepping motor rotates to the reference rotation direction at a later stage pulse number which is obtained by adding a correcting pulse number to the overdriving pulse number.

Description

The present invention moves the movable plate in the gas amount adjustment moving direction with respect to the fixed plate, thereby reducing the gas flow opening degree between the minimum flow opening degree and the maximum flow opening degree. It is configured to change to a fully closed opening, and the movable plate is moved in one direction along the moving direction for adjusting the gas amount, thereby increasing the flow opening, and A gas amount adjusting unit that reduces the flow opening degree to the fully closed opening degree by moving the movable plate in the other direction along the gas amount adjusting moving direction;
A stepping motor that moves the movable plate in the gas amount adjusting movement direction;
A motor control unit that controls the operation of the stepping motor to change the gas flow opening to the target flow opening based on the magnitude of the target heating power and the setting information of the combustion state setting unit that instructs the combustion stop And a combustion gas amount control device.

  Such a combustion gas amount control device is used by being incorporated in a gas combustion device such as a gas stove, for example, equipped on a gas stove and used to control the supply of gas fuel supplied to a stove burner.

  As a conventional example of the combustion gas amount control device, the position of the drive connecting shaft connected to the slide closing member among the constituent members constituting the linkage mechanism for connecting the output shaft of the stepping motor and the slide closing member as the movable plate And a drive control unit as a motor control unit is closed position (position corresponding to the fully closed opening), low fire position, medium weak position, medium fire position, medium strong position, strong position In order to move the slide closure to a position corresponding to the above five steps, there are some which are configured to control the operation of the stepping motor by determining the number of pulses applied to the stepping motor.

  Specifically, when moving the slide closure to the closed position, a control mode in which the stepping motor is operated while confirming whether or not the slide closure is at the closed position based on the detection information of the encoder, that is, The stepping motor is driven in a feedback control form using the detection information of the encoder as feedback information.

  Also, the number of pulses for moving the slide closer from the closed position to the low heat position, the number of pulses for moving the slide closer from the closed position to the medium to low position, and the slide closer from the closed position to the medium heat position. The number of pulses for moving the slide closure from the closed position to the middle strong position and the number of pulses for moving the slide closure from the closed position to the strong position are set as the relationship between the heating power and the number of pulses. By using this relationship, the number of pulses for moving the slide closure to the target position is determined, and the stepping motor is driven by the number of pulses.

  Since there is coupling flexibility (play) between the drive coupling shaft to which the encoder is connected and the output shaft of the stepping motor, a number of pulses for play compensation corresponding to the coupling flexibility (play) is set in advance. In order to change the rotation direction of the stepping motor, in order to move the slide closure to the target position by adding the number of pulses for play correction to the number of pulses obtained from the relationship between the heating power and the number of pulses. The number of pulses is obtained, and the stepping motor is driven with the number of pulses.

  As a process for obtaining the number of pulses for play correction, a predetermined pulse (for example, 10 pulses) is applied so as to rotate the stepping motor in the forward direction from the state where the encoder detects the end, and then the stepping motor is moved in the reverse direction. The number of pulses until the encoder detects the end of the rotation is calculated, and the difference between the number of pulses rotated in the forward direction and the number of pulses calculated in the reverse direction is corrected for play. For example, Patent Document 1 (see paragraphs [0052] to [0059] and [0068] to [0072]) is configured to perform an error detection process for obtaining the number of pulses.

JP 2000-171030 A

  The conventional combustion gas amount control device is used to move the slide closure to a target position when operating the slide closure to a position other than the closed position where the gas flow opening is fully closed. Since the stepping motor is driven in a so-called open loop control mode in which the number of pulses is obtained and the stepping motor is driven with the obtained number of pulses, when the slide closure is moved to a position corresponding to the target heating power In addition, the stepping motor can be driven with a simple control configuration in which the control load of the drive control unit is small as compared with the case where the stepping motor is driven in a feedback control form using the detection information of the encoder as feedback information.

  However, in the conventional combustion gas amount control device, when the slide closure is operated at the closed position where the gas flow opening degree becomes the fully closed opening degree, the stepping is performed in the feedback control form using the detection information of the encoder as the feedback information. Since the configuration drives the motor, there is a disadvantage that it is difficult to sufficiently simplify the control configuration.

  Further, in the conventional combustion gas amount control device, a pulse for play correction is provided in accordance with the connection flexibility (play) existing between the drive connection shaft connected to the slide closure and the output shaft of the stepping motor. Since the number is calculated, the number of pulses for play correction can be calculated without considering the connection flexibility (play) that is expected to exist between the drive connection shaft and the slide closure. For this reason, when there is connection accommodation (play) between the drive connecting shaft and the slide closure, the slide closure cannot be moved with high accuracy.

  Furthermore, in the conventional combustion gas amount control device, it is necessary to perform error detection processing for obtaining the number of pulses for play correction for each device. For example, when the combustion gas amount control device is mounted on a gas stove, In each of the produced gas stoves, if error detection processing for obtaining the number of pulses for play correction is performed, the production of the gas stove becomes complicated and it becomes difficult to improve the production efficiency. There was a disadvantage.

  The present invention has been made in view of the above circumstances, and its purpose is to sufficiently simplify the control configuration, and to move and move the movable plate with high accuracy. And an advantageous combustion gas amount control device.

The combustion gas amount control device of the present invention moves the movable plate in the gas amount adjustment moving direction with respect to the fixed plate, thereby reducing the gas flow opening degree between the minimum flow opening degree and the maximum flow opening degree. The flow opening degree and the fully closed opening degree are changed, and the movable plate is moved in one direction along the moving direction for adjusting the gas amount. The amount of gas that decreases the flow opening and makes the fully closed opening when the movable plate is moved in the other direction along the moving direction for adjusting the amount of gas. An adjustment unit;
A stepping motor that moves the movable plate in the gas amount adjusting movement direction;
A motor control unit for controlling the operation of the stepping motor so as to change the gas flow opening to the target flow opening based on the magnitude of the target heating power and the setting information of the combustion state setting unit instructing the combustion stop; The first characteristic configuration is as follows:
Rotation phase detection means for detecting the rotation phase of the output shaft of the stepping motor is provided,
The motor control unit is
When the stepping motor is operated so that the output shaft has a set reference rotation phase, it is determined based on detection information of the rotation phase detection means that the output shaft is deviated from the set reference rotation phase. In this case, a phase adjustment process for driving the stepping motor to rotate the output shaft to the set reference rotation phase is configured.
Opening degree relationship information storage means for storing opening degree relation information indicating a relation between the opening degree for gas flow and the rotation phase of the output shaft in a state where the output shaft of the stepping motor is moved in a reference rotation direction; Provided,
The motor control unit is
The target number of pulses applied to the stepping motor to change from the current gas flow opening to the target flow opening is set to open when the rotation direction of the output shaft is not changed from the previous rotation direction. In the form of the number of pulses obtained based on the degree relation information, and when changing the rotation direction of the output shaft from the previous rotation direction, the number of pulses obtained based on the opening degree relation information, A normal drive process for driving the stepping motor in a form of a pulse number obtained by adding a preset number of correction pulses for play correction corresponding to the linkage flexibility of the linkage mechanism that links the output shaft and the movable plate And is configured to perform
When the setting start condition is satisfied when the output shaft is rotated in the direction opposite to the reference rotation direction in order to change to the target flow opening, the preset overdrive pulse number is set to the target pulse number. The stepping motor is driven in the rotation direction in which the output shaft rotates in the direction opposite to the reference rotation direction with the initial pulse number added to the number of pulses, and then the correction pulse number and the overdrive pulse number A high-precision driving process for driving the stepping motor in the rotation direction in which the output shaft rotates in the reference rotation direction is executed at the number of late pulses added.

That is, the motor control unit determines the number of pulses to be applied to the stepping motor in order to change from the current gas flow opening to the target flow opening in both the normal drive processing and the high-precision drive processing. Since the motor is driven, the stepping motor can be driven with a simple control configuration in which the load of the motor control unit is small.
That is, when changing the current gas flow opening to the target flow opening by the normal drive process and the high precision drive process, including when rotating the output shaft to the set reference rotation phase, Since the stepping motor is driven in an open loop control mode, the control configuration can be simplified sufficiently.

  Also, in normal drive processing, when changing the rotation direction of the output shaft from the previous rotation direction, the target pulse number applied to the stepping motor to change from the current gas flow opening to the target flow opening In the form of the number of pulses obtained based on the opening relation state, and when changing the rotation direction of the output shaft from the previous rotation direction, the number of pulses obtained based on the opening relation state, The stepping motor is driven by determining the number of correction pulses set in advance corresponding to the linkage flexibility of the linkage mechanism that links the output shaft and the movable plate to the number of pulses. Using the opening relationship information stored in the opening relationship storage means and the number of correction pulses for play correction set in advance corresponding to the linkage accommodation of the linkage mechanism that links the output shaft and the movable plate, While allowing the proper determining the number of pulses can be appropriately adjusted gas passage diverting opening to the target through diversion opening.

  In other words, the number of correction pulses for play correction is set corresponding to the linkage flexibility of the linkage mechanism that links the output shaft and the movable plate, in other words, all of the pulses existing between the output shaft and the movable plate. Since it is set corresponding to the linkage accommodation, the target pulse number is appropriately determined according to the linkage accommodation existing in the linkage mechanism that links the output shaft and the movable plate. It can be appropriately adjusted to the target flow opening.

  By the way, when the rotation direction of the output shaft is not changed from the previous rotation direction, the direction in which the output shaft is rotated to change the opening for gas flow to the target flow opening for the previous time, and for gas flow This means that the direction in which the output shaft is rotated in order to change the opening to the target flow opening this time is the same, and in this case, there is no influence of linkage flexibility of the linkage mechanism The target pulse number is determined based on the opening degree relation information stored in the opening degree relation storage means.

  On the other hand, when changing the rotation direction of the output shaft from the previous rotation direction, the direction in which the output shaft is rotated in order to change the opening for gas flow to the target flow opening for the previous time, This means that the direction in which the output shaft is rotated in order to change the gas flow opening to the target flow opening this time is the opposite direction. Due to the influence, the rotation amount of the output shaft is insufficient only by determining the target pulse number based on the opening degree relation information stored in the opening degree relation storage means. The number of pulses obtained by adding the number of pulses obtained based on the degree relation information and the preset number of correction pulses for play correction is determined as the target number of pulses.

In addition, since the phase adjustment process is performed, the target opening degree can be more accurately adjusted in both the normal drive process and the high-precision drive process.
That is, when the motor control unit operates the stepping motor so that the output shaft is at the set reference rotation phase, the output shaft is deviated from the set reference rotation phase based on the detection information of the output shaft rotation phase detecting means. When the stepping motor is driven to rotate the output shaft to the set reference rotation phase, the rotation relationship of the output shaft is stored in the opening relationship information storage means. Since the rotational phase corresponding to the information is adjusted, the target opening degree can be adjusted more accurately in both the normal drive process and the high-precision drive process.

  In other words, when the motor control unit drives the stepping motor in an open loop control mode, even if the output shaft does not rotate properly due to out-of-step, etc., the reference adjustment rotation will be performed by phase adjustment processing. Since the output shaft rotated to the phase is restored to the state of rotating to the set reference rotation phase, the rotation phase of the output shaft corresponds to the rotation phase corresponding to the opening degree relation information stored in the opening degree relation information storage means. Therefore, in both the normal drive process and the high-precision drive process, the target opening degree can be adjusted more accurately.

  Further, when the output shaft is rotated in the direction opposite to the reference rotation direction in order to change to the target flow opening, when the setting start condition is satisfied, the high precision driving process is executed. Even when the output shaft is rotated in the direction opposite to the reference rotation direction in order to change to the diversion opening, the gas flow opening can be accurately changed to the target flow opening.

  That is, in the high-precision driving process, the stepping motor is moved toward the rotation direction in which the output shaft rotates in the direction opposite to the reference rotation direction at the initial pulse number obtained by adding the preset number of overdrive pulses to the target pulse number. After that, the stepping motor is driven in the rotation direction in which the output shaft rotates in the reference rotation direction with the latter pulse obtained by adding the correction pulse number and the overdrive pulse number. The gas flow opening can be accurately changed to the target flow opening without being affected by the accommodation.

The high precision driving process will be described with reference to FIG.
Incidentally, the output shaft Q1 originally rotates, but in FIG. 17, the output shaft Q1 is illustrated as moving linearly, and the movable plate Q2 is linearly moved by being pressed by the linearly moving output shaft Q1. It is illustrated as what to do.
The movable plate Q2 is formed with a recess with which the output shaft Q1 is engaged, and the width of the recess is formed larger than the diameter of the output shaft Q1 in correspondence with the linkage accommodation.
In FIG. 17, in order to show that the size of the linkage accommodation changes, a state where the width of the concave portion is small is shown by a broken line corresponding to the case where the linkage accommodation is small.

In the uppermost drawing of FIG. 17, the output shaft Q1 moves from the P1 position to the P2 position while moving in the reference rotation direction (CCW direction), and the movable plate Q2 is moved from the P1 position to the P2 position. Indicates.
Incidentally, the output shaft Q1 at the P1 position exemplifies a state where the output shaft Q1 is stopped while moving in the reference rotation direction (CCW direction), so the target pulse number for moving the output shaft Q1 from the P1 position to the P2 position is The rotation direction of the output shaft Q1 is determined based on the opening degree relationship information in correspondence with the case where the rotation direction is not changed from the previous rotation direction.

The middle diagram of FIG. 17 shows that the output shaft Q1 moves in the direction opposite to the reference rotation direction (CW direction) by operating the stepping motor with the initial number of pulses in order to execute the high-precision driving process. In this state, the movable plate Q2 moves from the P2 position to the P3 position beyond the P1 position, and the movable plate Q2 moves to a position beyond the P1 position.
Incidentally, since the output shaft Q1 at the P2 position is stopped while moving in the reference rotation direction (CCW direction), the initial pulse number for moving the output shaft Q1 from the P2 position to the P3 position exceeds the target pulse number. In addition to the number of driving pulses, the target number of pulses is set to the number of pulses determined based on the opening degree relationship information in correspondence with the case where the rotation direction of the output shaft Q1 is changed from the previous rotation direction. It is obtained in a form in which the number of correction pulses for correction is added.

The lowermost diagram in FIG. 17 shows the P3 position while the output shaft Q1 moves in the reference rotation direction (CCW direction) by operating the stepping motor with the latter number of pulses in order to execute the high-precision driving process. Shows a state in which the movable plate Q2 at a position beyond the P1 position is moved to the P1 position.
The late pulse number is obtained by adding the correction pulse number for play correction and the overdrive pulse number.

In other words, the output shaft at the P2 position has the same number of pulses as the number of pulses (target pulse number) when moving the output shaft Q1 from the P1 position to the P2 position while moving in the reference rotation direction (CCW direction). When the stepping motor is driven to move Q1 in the direction opposite to the reference rotation direction (CW direction), the output shaft Q1 moves to the P1 position.
However, the movable plate Q2 does not return to the position shown in the uppermost drawing of FIG. 17 due to linkage accommodation.
That is, the movable plate Q2 does not move to the position shown in the uppermost drawing of FIG. 17, but moves to a position biased in the reference rotation direction (CCW direction).

  The number of correction pulses for play correction is added to the same number of pulses as the number of pulses (target pulse number) when moving the output shaft Q1 from the P1 position to the P2 position while moving in the reference rotation direction (CCW direction). When the stepping motor is driven to move the output shaft Q1 in the direction opposite to the reference rotation direction (CW direction) with the number of pulses, the output shaft Q1 is moved beyond the P1 position.

In this state, when the number of correction pulses for play correction matches the size of linkage accommodation, the movable plate Q2 returns to the position shown in the uppermost drawing of FIG.
However, when the number of correction pulses for play correction does not match the size of linkage accommodation, the movable plate Q2 does not return to the position shown in the uppermost drawing of FIG.

  In other words, the linkage flexibility of the linkage mechanism varies due to individual errors for each device, and when a large number of devices are targeted, the fluctuation range of the linkage flexibility is predicted, but for play correction For example, the correction pulse is set to a value corresponding to a specific value in the variation range of linkage accommodation, such as being set to a value corresponding to the median value of the variation range of linkage accommodation.

  As a result, when the output shaft Q1 at the P2 position is moved in the direction opposite to the reference rotation direction (CW direction), the number of correction pulses for play correction is added to the number of pulses for moving the output shaft Q1 from the P2 position to the P1 position. Even if the stepping motor is driven with the added number of pulses, the movable plate Q2 does not return to the position shown in the uppermost stage of FIG. 17, but rather the reference rotation than the position shown in the uppermost figure of FIG. There is a possibility that the position is deviated in the direction (CCW direction) or the position deviated in the direction opposite to the reference rotation direction (CCW direction) (CW direction) from the position shown in the uppermost drawing of FIG.

  Therefore, the amount by which the output shaft Q1 is moved by the number of late pulses obtained by adding the number of correction pulses for play correction and the number of pulses for overdriving exceeds the maximum value of the predicted fluctuation range of linkage accommodation. In addition, the number of overdriving pulses is set in view of the maximum value of the fluctuation range that is predicted to be linked and the number of correction pulses for play correction.

  Then, as shown in the middle diagram of FIG. 17, when the output shaft Q1 at the P2 position is moved in the direction opposite to the reference rotation direction (CW direction), the initial number obtained by adding the overdrive pulse number to the target pulse number When the stepping motor is driven to determine the number of pulses and move the output shaft Q1 in the direction opposite to the reference rotation direction (CW direction), the output shaft Q1 moves beyond the P1 position to the P3 position, and the movable plate Q2 Will move to a position beyond the position shown in the top row of FIG.

  Thereafter, as shown in the lowermost diagram in FIG. 17, the output shaft Q1 is directed in the rotation direction in which the output shaft Q1 rotates in the reference rotation direction (CCW direction) at the latter pulse obtained by adding the number of correction pulses and the number of overdrive pulses. When the stepping motor is driven, the movable plate Q2 moves to the position shown in the uppermost drawing of FIG.

In other words, by executing high-precision drive processing, even when the output shaft is rotated in the direction opposite to the reference rotation direction in order to change to the target flow opening, the target flow opening can be accurately changed. Can do.
And, as a setting start condition, for example, if it is set as a condition that the opening for target flow is an opening that needs to be adjusted with high accuracy, the opening for gas flow requires high accuracy. Therefore, it can be accurately adjusted to the target opening degree.

  By the way, in all cases where the output shaft is rotated in the direction opposite to the reference rotation direction in order to change to the target flow opening, it is conceivable to execute the high-precision drive process. In view of the disadvantages of increasing the amount of driving power consumed because the motor is driven in the forward and reverse directions, it is preferable to execute the high-precision driving process only when the setting start condition is satisfied. is there.

  The fluctuation range of linkage accommodation can be predicted in advance by experiments, etc., and the number of correction pulses and linkage accommodation overdriving pulses can be predicted without performing complicated operations such as measurement for each device. Since it can be determined based on the fluctuation range of linkage accommodation, there are no disadvantages such as a reduction in manufacturing efficiency in order to determine the number of correction pulses and the number of pulses for linkage accommodation overdriving.

  In short, according to the first characteristic configuration of the present invention, the control configuration can be sufficiently simplified, the movable plate can be moved with high accuracy, and the combustion gas amount control is advantageous in terms of manufacturing. Equipment can be provided.

In addition to the first characteristic configuration, the second characteristic configuration of the combustion gas amount control device of the present invention is:
The number of correction pulses is set corresponding to the median value of the predicted fluctuation range of the linkage accommodation,
The number of overdriving pulses is set corresponding to a value equal to or greater than a difference between the median value and the maximum value of the fluctuation range.

  In other words, since the number of correction pulses is set corresponding to the median value of the predicted fluctuation range of the linkage accommodation, even if the linkage accommodation size of the linkage mechanism varies, in the normal drive process, the gas passage The diversion opening can be made as close as possible to the target flow opening.

  When the number of pulses for overdriving is set corresponding to a value greater than or equal to the difference between the median value of the fluctuation range and the maximum value of the fluctuation range, it is the maximum value of the fluctuation range in which linkage accommodation is expected In addition, the gas flow opening can be accurately adjusted to the target flow opening for which high accuracy is required by the high precision driving process.

  In short, according to the second characteristic configuration of the present invention, in addition to the operational effect of the first characteristic configuration, in the normal driving process, the gas flow opening can be made as close as possible to the target flow opening, Combustion gas amount control that can accurately adjust the opening for gas flow to the target opening for which high accuracy is required by high-precision drive processing even when the linkage range is the maximum value of the predicted fluctuation range Equipment can be provided.

In addition to the first or second characteristic configuration described above, the third characteristic configuration of the combustion gas amount control device of the present invention includes:
The gas amount adjusting unit is provided corresponding to a stove burner equipped in a gas stove,
The set reference rotation phase is a rotation phase at which the opening for gas flow is set to the fully closed opening; and the reference rotation direction is a rotation direction for operating the flow opening at a decreasing side;
The motor control unit is configured to determine that the setting start condition is satisfied when the target opening for opening of the target flow is the opening of opening for ignition of the stove burner. .

  That is, since the set reference rotation phase is set to a rotation phase for operating the gas flow opening to the fully closed opening, when the gas flow opening is operated to the fully closed opening by the combustion stop instruction The output shaft is rotated to the set reference rotation phase.

  Therefore, every time the output shaft is rotated to the set reference rotation phase by the combustion stop instruction, the phase adjustment process is executed, and the output shaft is shifted from the set reference rotation phase based on the detection information of the rotation phase detecting means. If there is a deviation, the stepping motor is driven to rotate the output shaft to the set reference rotation phase. It can be operated to the fully closed opening.

  The gas amount adjusting unit is provided corresponding to the stove burner equipped in the gas stove, the reference rotation direction is the rotation direction for operating the flow opening degree to the decreasing side, and the motor control unit is opened for target flow opening. When the degree of opening is the compass burner ignition opening, it is configured to determine that the setting start condition is satisfied. When changing from the opening to the ignition flow opening, high-precision drive processing is executed, and the gas flow opening can be accurately adjusted to the ignition flow opening.

  Thus, when igniting the burner, the gas flow opening can be accurately adjusted to the ignition flow opening by executing the high-precision driving process. An appropriate amount of the burner can be ignited satisfactorily.

  In short, according to the third feature configuration of the present invention, in addition to the operational effects of the first or second feature configuration, the gas flow opening degree can be reliably operated to the fully closed opening degree by an instruction to stop combustion. In addition, it is possible to provide a combustion gas amount control device that can satisfactorily ignite the burner.

In addition to the first or second characteristic configuration described above, the fourth characteristic configuration of the combustion gas amount control device of the present invention includes:
The gas amount adjusting unit is provided corresponding to a stove burner equipped in a gas stove,
The reference rotation direction is a rotation direction for operating the flow opening degree to the decrease side,
The motor control unit is configured to execute a rice cooking operation process when a rice cooking operation command is instructed, and the target opening degree increases the opening degree during the rice cooking operation process. If there is a relationship to be satisfied, it is characterized in that it is determined that the setting start condition is satisfied.

  That is, the gas amount adjusting unit is provided corresponding to the stove burner equipped in the gas stove, the reference rotation direction is the rotation direction for operating the flow opening degree to the decrease side, and the motor control unit outputs the rice cooking operation command. It is configured to execute the rice cooking operation process when instructed, and the setting start condition is satisfied when the target opening degree is in a relation to increase the opening degree during the rice cooking operation process. Since it is configured to discriminate that it has been performed, it is possible to accurately change the flow opening degree to a large flow opening degree during execution of the rice cooking operation process by the high-precision driving process.

  In other words, in the rice cooking operation process, for example, heating is adjusted with a medium heating power, then heated with a small heating power smaller than the medium heating power, and then heated again with a medium heating power. become. And, when changing the thermal power from small thermal power to medium thermal power, it is necessary to adjust the flow opening degree accurately to the flow opening degree for the medium thermal power set as the opening corresponding to the medium thermal power. Although it is not possible to cook rice, it is possible to increase the flow opening degree from the opening degree corresponding to the small heating power to the opening degree corresponding to the medium heating power by performing the high accuracy driving process. Can be accurately increased from the opening corresponding to the small heating power to the opening corresponding to the medium heating power, and the rice cooking operation process can be performed satisfactorily.

  By the way, when adjusting the opening to the opening corresponding to the medium thermal power, if the opening degree is larger than the opening corresponding to the medium thermal power, the thermal power is too strong, resulting in blown zero and lack of water. The occurrence of inconvenience such as hardened cooked rice occurs, and if the opening degree is smaller than the opening corresponding to the medium heating power, the heating power is too weak, so the time until cooking is longer Inconveniences such as inconvenience and the cooked rice become soft will occur.

  In short, according to the fourth characteristic configuration of the present invention, in addition to the operational effects of the first or second characteristic configuration, it is possible to provide a combustion gas amount control device that can perform the rice cooking operation process satisfactorily.

In addition to any of the first to fourth feature configurations described above, the fifth feature configuration of the combustion gas amount control device of the present invention includes:
The motor control unit is configured to control the operation of the stepping motor to change the gas flow opening to the fully closed opening when abnormality occurrence information is input. To do.

  That is, the motor control unit is configured to control the operation of the stepping motor so as to change the gas flow opening degree to the fully closed opening degree when the abnormality occurrence information is input. It is possible to improve the safety by operating the degree to the fully closed opening degree, and it is possible to appropriately start the combustion from the state where the gas flow opening degree is fully closed.

That is, the abnormality occurrence state is, for example, a state where the burning gas burner extinguishes even though the gas supply is not stopped, or a state where the cooking container heated by the gas burner is at an abnormally high temperature. is there.
Therefore, in such a state, it is possible to improve the safety by operating the gas flow opening to the fully closed opening to cut off the gas supply.

  After that, when the combustion is started again, the gas flow opening is already operated to the fully closed position. Therefore, the gas flow is not operated without operating the gas flow opening to the fully closed position. Combustion can be appropriately started from a state where the diversion opening is fully closed.

  In short, according to the fifth characteristic configuration of the present invention, in addition to the operational effects of any of the first to fourth characteristic configurations, safety can be improved, and the gas flow opening is fully increased. It is possible to provide a combustion gas amount control device capable of appropriately starting combustion from the closed state.

In addition to any of the first to fifth characteristic configurations, the sixth characteristic configuration of the combustion gas amount control device of the present invention is:
The movable plate is rotatably supported around a rotation axis along the axis of the output shaft, and is rotated by the stepping motor with the rotation direction around the rotation axis as the gas amount adjustment moving direction. It is characterized by being configured to be operated.

  That is, the movable plate is rotatably supported around the rotation axis along the axis of the output shaft, and is rotated by the stepping motor with the rotation direction around the rotation axis as the gas amount adjustment moving direction. Since the stepping motor, the movable plate, and the fixed plate are arranged along the axial direction of the output shaft of the stepping motor, the overall configuration can be made compact.

  In short, according to the sixth feature configuration of the present invention, it is possible to provide a combustion gas amount control device capable of reducing the overall configuration in addition to the operational effects of any of the first to fifth feature configurations. .

Gas stove perspective view Schematic showing fuel supply configuration and combustion control configuration of gas stove Perspective view of gas flow control unit Notched side view of high thermal power control unit Exploded perspective view of high thermal power control unit Plan view of movable plate Partially cutaway side view showing the main part of the control unit for high thermal power Notched plan view showing relationship between safety valve, safety valve operating body and movable body Notched plan view showing the same relationship Notched plan view showing the same relationship The figure which shows the relationship between the rotation angle (rotation phase) of the output shaft and the gas flow opening Schematic diagram of stepping motor Diagram showing current flow for stepping motor Flow chart showing control operation Time chart showing ignition process and thermal power adjustment process Time chart showing fire extinguishing process Explanatory diagram of high-precision drive processing Time chart showing control details of rice cooking mode

Embodiment
Embodiments of the present invention will be described with reference to the drawings.
(Overall configuration of gas stove)
As shown in FIG. 1, the illustrated gas stove includes three stove burners 1 on an upper surface portion of a stove body, and a grill burner 2 (see FIG. 2) in a grill portion GR inside the stove body. And built-in type that is built into the kitchen counter.

The three stove burners 1 are a high thermal power burner 1A disposed on the left side, a standard burner 1B disposed on the right side, and a small thermal power burner 1C disposed at the back side in the center in the lateral width direction, A temperature detection sensor PS that detects the temperature of an object to be heated such as a pan is provided at the center of each burner 1.
The grill burner 2 is an upper grill burner 2U and a lower grill burner 2S (see FIG. 2).

The upper surface of the stove body is covered with a glass top plate 3, and a grill exhaust port 4 for exhausting combustion exhaust gas from the grill portion GR is formed at a rear side portion of the upper surface of the stove body.
Further, on the top of the top plate 3, there are provided five virtues 5 for placing a cooking container such as a pot heated by each of the three stove burners 1.

Incidentally, as shown in FIG. 2, each of the three burner 1 and grill burner 2 is equipped with an ignition detection sensor J for detecting ignition, which is configured by using an igniter L for ignition, a thermocouple, and the like. .
In addition, although the grill lower burner 2S as the grill burner 2 is equipped with a pair of left and right, only one is shown in FIG.

(Operation configuration of gas stove)
As shown in FIG. 1, an operation tool 6A for high thermal power with respect to the high thermal power burner 1A is disposed at the left side portion of the front portion of the stove body, and a standard portion is provided at the right side portion of the front portion of the stove body. A standard operating tool 6B for the burner 1B and a small thermal power operating tool 6C for the small thermal power burner 1C are disposed.
In the following description, when it is not necessary to distinguish between the high thermal power operating tool 6A, the small thermal power operating tool 6C, and the standard operating tool 6B, they are referred to as the operating tool 6.

  Each operation tool 6 issues a command for starting combustion (hereinafter abbreviated as an ignition command) and a command for stopping combustion (hereinafter abbreviated as a fire extinguishing command) for the corresponding combustor 1, and the corresponding control burner. 1 for instructing the magnitude of the target thermal power (hereinafter, abbreviated as a thermal power adjustment command). Specifically, every time the operation is pushed forward, an ignition command and a fire extinguishing command are alternately displayed. The thermal power control command is commanded by commanding and rotating in the forward and reverse directions around the longitudinal axis.

  In other words, each operation tool 6 moves in the direction of the rotation axis each time it is pushed, and is pushed into the inside of the stove body by the position holding mechanism (not shown) and the protrusion protruding forward. It is configured so that it can be switched to a position, and when each operation tool 6 is switched to the protruding position, it can be rotated in both the forward direction and the reverse direction.

  Point extinguishing switches 7A, 7B, and 7C (see FIG. 2) are provided corresponding to each operating tool 6, and these point extinguishing switches 7A, 7B, and 7C are turned off when the operating tool 6 is operated to the pushed-in position. When the operation tool 6 is operated to the protruding position, the device is configured to be in the ON (on) state.

As shown in FIG. 2, the detection information of the point fire extinguishing switches 7A, 7B, 7C is input to an operation control unit U as an operation control means.
The operation control unit U determines that it is an ignition command when the point extinguishing switches 7A, 7B, and 7C are turned on, and when the point extinguishing switches 7A, 7B, and 7C are turned off (off), And, as will be described later, an ignition process is executed based on the ignition command, and a fire extinguishing process is executed based on the fire extinguishing command.

Further, rotary encoders 8A, 8B and 8C (see FIG. 2) as pulse generating means for outputting a pulse signal in accordance with the rotation operation of each operation tool 6 are provided corresponding to each operation tool 6.
These rotary encoders 8A, 8B, and 8C are configured such that one of the two pulse signals advances in phase with respect to the other pulse signal as the operation tool 6 rotates in one direction. In a state where the phase of the other pulse signal is advanced from that of the one pulse signal in accordance with the rotation operation in the direction, two pulse signals having different phases are output in accordance with the rotation operation of each operation tool 6. ing.

As shown in FIG. 2, the detection information of each rotary encoder 8A, 8B, 8C is input to the operation control unit U.
Based on the pulse signals of the rotary encoders 8A, 8B, 8C, the operation control unit U issues a one-step heating power increase command as a heating power adjustment command each time the operation tool 6 is rotated to the right by a set angle. Each time the operating tool 6 is rotated to the left by a set angle, it is determined that a one-step heating power reduction command has been commanded as a heating power adjustment command. The thermal power adjustment processing is executed based on the thermal power adjustment command (thermal power increase command, thermal power decrease command).

  Incidentally, although not shown in the drawing, an imparting means for imparting a click feeling to each operation tool 6 is provided in a state of imparting a click feeling each time each operation tool 6 is rotated by a set angle in the left direction and the right direction. Thus, it is easy to rotate each operation tool 6 by a set angle in the left direction and the right direction.

In this embodiment, it is comprised so that the 9 steps | paragraph of target thermal power can be set as a magnitude | size of target thermal power.
And the gas stove of this embodiment is comprised so that 13A city gas (henceforth 13A gas) and LP gas can be used as gas fuel, Comprising: About any gas fuel, target It is comprised so that the magnitude | size of a thermal power can be set to the target thermal power of 9 steps.

  That is, as shown in FIG. 2, the operation control unit U is based on gas type setting information set by a gas type setting switch GE as a gas type setting unit that sets which of a plurality of types of gas fuel. Thus, even when a target heating power of the same size is commanded by the operation tool 6, the flow opening degree of the stove flow rate control valves 16A, 16B, 16C (details will be described later) according to the set gas type It is comprised so that it may change to a flow opening degree.

Incidentally, the three burner 1 and the grill burner 2 are provided with a mixing pipe into which the primary air is introduced by the ejector action when the gas fuel is supplied from the gas ejection nozzle and the gas fuel is ejected from the gas ejection nozzle, And it is comprised so that secondary air may be introduced and combusted with combustion.
And as a gas ejection nozzle, the gas ejection nozzle according to 13A gas and the gas ejection nozzle according to LP gas are prepared, and it is comprised so that it may select according to the kind of gas fuel which uses these gas ejection nozzles Has been.

In addition, a setting operation for a stove for inputting information such as a cooking menu to the lower side portion of the front side portion of the stove body, that is, the lower side portion of the operation tool for small heating power 6C and the operation tool for standard 6B. A section SC is provided.
Then, as shown in FIG. 2, setting information of the stove setting operation unit SC is input to the operation control unit U, and the operation control unit U performs an operation process corresponding to the cooking menu set while adjusting the heating power. For example, the combustion control for the three burners 1 is executed.

  The cooking menu set in the stove setting operation unit SC includes a kettle operation, a fried food operation, a rice cooking operation, etc., but in this embodiment, a rice cooking operation process for executing the rice cooking operation will be described later. A description of operation processes such as a water heater operation and a fried food operation is omitted.

  Incidentally, in this embodiment, each operation tool 6 functions as a combustion state setting unit M (see FIG. 2) for instructing the start of combustion, the magnitude of the target heating power, and the combustion stop.

A power switch 9 is provided above the right side of the front surface of the stove body, and the operation control unit U performs power control when the power switch 9 is turned on and operated. Is configured to be supplied.
Incidentally, the electric power supplied when the power switch 9 is turned on and operated is also used as operating electric power for various devices included in the stove body.

A grill setting operation portion SG for the grill burner 2 is disposed at a lower side portion of the left side portion of the front surface of the stove body, that is, a lower portion of the high heating power operation tool 6A.
Then, as shown in FIG. 2, the setting information of the grill setting operation unit SG is input to the operation control unit U, and the operation control unit U burns the upper burner 2U and the lower grill burner 2S of the grill unit GR. However, in this embodiment, the description of the combustion control of the upper grill burner 2U and the lower grill burner 2S is omitted.

(Gas fuel supply configuration of gas stove)
As shown in FIG. 2, the three stove branch paths 12A, 12B, 12C for the three stove burners 1 and the grill branch path 13 for the grill burner 2 are branched into the source gas path 11 to which the gas fuel is supplied. Connected with.

The original gas passage 11 is provided with a closed and energized original solenoid valve 15, and each of the three stove branch passages 12A, 12B, and 12C has gas fuel supplied to the three stove burners 1. Stove flow rate adjustment valves 16A, 16B, and 16C for adjusting the supply amount are provided, and a grill flow rate adjustment valve 17 for adjusting the supply amount of gas fuel supplied to the grill burner 2 is provided in the grill branch 13. It is arranged.
In the following description, when it is not necessary to distinguish the three stove branch paths 12A, 12B, and 12C, they are described as the branch path 12, and the stove flow rate control valves 16A, 16B, and 16C need to be distinguished. When there is no flow rate, the flow rate control valve 16 is described.

The stove flow control valves 16A, 16B, and 16C function as a gas amount adjusting unit that changes the opening for gas flow to a flow opening between a minimum flow opening and a maximum flow opening and a fully closed opening. It is configured to be operated by the stove stepping motors 18A, 18B, 18C, the details of which will be described later.
Similarly, the grill flow control valve 17 is configured to be operated by a grill stepping motor 19.
In the following description, when there is no need to distinguish between the three stove stepping motors 18A, 18B, and 18C, they are referred to as stepping motors 18.

In addition, the stove safety valves 20A, 20B, and 20C are disposed in the three stove branch paths 12A, 12B, and 12C, respectively, and the grill branch path 13 is equipped with the grill safety valve 21 and the grill governor 22. Has been.
The stove safety valves 20A, 20B, and 20C are elastically biased to the closed state that shuts off the gas supply, and are held in the open state by the electromagnetic holding unit 20G (see FIG. 8) when operated in the open state. The grill safety valve 21 is configured in the same manner.

The stove safety valves 20A, 20B, and 20C are configured to be opened by the stove stepping motors 18A, 18B, and 18C, details of which will be described later.
Similarly, the grill safety valve 21 is configured to be opened by the grill stepping motor 19.
In the following description, when it is not necessary to distinguish the three stove safety valves 20A, 20B, and 20C, they are referred to as safety valves 20.

  As shown in FIG. 3, a gas flow control unit V is provided, and the gas flow control unit V includes the original solenoid valve 15, the stove flow control valves 16A, 16B, and 16C, and the stove safety valves 20A, 20B, and 20C. The grill flow control valve 17, the grill safety valve 21, and the grill governor 22 are integrally incorporated.

  That is, the gas flow control unit V includes a high thermal power control unit VA corresponding to the high thermal power burner 1A, a standard control unit VB corresponding to the standard burner 1B, a small thermal power control unit VC corresponding to the small thermal power burner 1C, and The grill control unit VG corresponding to the grill burner 2 and the original solenoid valve 15 are provided.

The high thermal power control unit VA is configured to include a stove flow rate adjusting valve 16A, a stove safety valve 20A, and a stove stepping motor 18A.
The standard control unit VB is configured to be equipped with a stove flow control valve 16B, a stove safety valve 20B, and a stove stepping motor 18B.
The small thermal power control unit VC is configured to include a stove flow rate adjusting valve 16C, a stove safety valve 20C, and a stove stepping motor 18C.
The grill control unit VG is configured to include a grill flow control valve 17, a grill safety valve 21, a grill stepping motor 19, and a grill governor 22.

(Configuration of control unit for high thermal power)
Since the high thermal power control unit VA, the standard control unit VB, and the small thermal power control unit VC have the same configuration, the specific configuration will be described below with the high thermal power control unit VA as a representative.
In the following description, the stove flow rate control valve 16A is described as the flow rate control valve 16, the stove safety valve 20A is described as the safety valve 20, and the stove stepping motor 18A is described as the stepping motor 18.

As shown in FIGS. 4 and 5, the high thermal power control unit VA incorporates the flow rate adjustment valve 16 and the safety valve 20 in the casing 25, and includes a stepping motor 18 at the bottom of the casing 25.
Incidentally, as shown in FIG. 4, a potentiometer PM as a rotational phase detection means for detecting the rotational phase of the output shaft 18T of the stepping motor 18 is provided in a state of being interlocked and connected to the output shaft 18T by a gear type interlocking mechanism. It has been.

The flow rate adjustment valve 16 moves the movable plate 27 in the gas amount adjustment moving direction with respect to the fixed plate 26 installed on the upper side of the casing 25, thereby reducing the gas flow opening degree to the minimum flow opening degree and the maximum flow opening degree. It is comprised so that it may change into the flow opening degree between a flow opening degree, and a fully closed opening degree.
That is, when the movable plate 27 is moved in one direction along the gas amount adjustment moving direction, the flow opening degree gradually increases, and the movable plate 27 moves along the gas amount adjustment moving direction. By being operated to move in the other side direction, the opening degree of the flow is gradually reduced. Further, after the opening degree of the flow is adjusted to the minimum opening degree, the movable plate 27 continues to move in the other side direction. By being operated, the opening for gas flow is changed to a fully closed opening.

  Specifically, the movable plate 27 is rotatably supported around the rotation axis Z along the axial direction of the output shaft 18T of the stepping motor 18, and the rotation direction around the rotation axis Z is used for gas amount adjustment. The moving direction is configured to be rotated by a stepping motor 18.

  Then, as shown in FIG. 6, the movable plate 27 is moved and operated in the CW direction along the clockwise direction as one side direction, whereby the opening degree of the flow is gradually increased. As the other side direction is moved in the CCW direction along the counterclockwise direction, the opening degree of the flow is gradually reduced, and further, after the opening degree of the flow is set to the minimum opening degree, the movable plate 27 continues. Is moved in the CCW direction along the counterclockwise direction, so that the gas flow opening degree is changed to the fully closed opening degree.

(Structure of flow control valve for stove)
When the flow control valve 16 is described further, the movable plate 27 is supported so as to be rotatable around the rotation axis Z while being in close contact with the lower surface of the fixed plate 26.
As shown in FIGS. 5 and 6, a gas flow hole 27 </ b> A penetrating vertically is formed in the movable plate 27, and a gas flow communicating with the gas flow hole 27 </ b> A is formed on the upper surface of the movable plate 27. The concave groove 27B is formed along the circumferential direction in such a state that the groove 27B becomes narrower as it moves away from the gas flow hole 27A along the CW direction.

As shown in FIGS. 4 and 5, a gas outflow hole 26A penetrating vertically is formed in the fixed plate 26 at a position facing the gas flow hole 27A and the gas flow concave groove 27B formed in the movable plate 27. Has been.
And in the open state of the safety valve 20, it is comprised so that the gas which flows through the inside of the casing 25 may be guide | induced to the gas flow hole 27A.

  Therefore, in a state where the gas outflow hole 26A matches the gas flow hole 27A, the flow opening degree is the maximum flow opening degree, and the gas outflow hole 26A is the smallest part of the gas flow concave groove 27B. In such a state that the opening degree is the minimum opening degree, the opening degree is changed so that the gas outlet hole 26A has the gas outlet hole 27A and the gas outlet groove. In a state that does not match 27B, the opening for gas flow is configured to be a fully closed opening.

Further, as shown in FIGS. 5 and 8, arc-shaped adjustment holes 26 a centering on the rotation axis Z of the movable plate 27 are provided at two circumferential positions on the outer peripheral portion of the fixed plate 26.
As shown in FIG. 4, a tightening bolt 28 that is substantially screwed into the casing 25 is provided in a state of being inserted through the adjustment hole 26 a, and the fixing plate 26 is fixed to the casing 25 by fastening the tightening bolt 28. It is fixed to.
Accordingly, by loosening the tightening bolt 28 and rotating the fixing plate 26 around the rotation axis Z, the gas outflow hole 26A is rotated around the rotation axis Z of the gas flow hole 27A and the gas flow groove 27B. It is configured so that the position can be adjusted.

  That is, the opening degree for adjusting the opening degree when the output shaft 18T of the stepping motor 18 is rotated in the CCW direction to the rotation phase corresponding to the minimum heating power to the set appropriate opening degree corresponding to the minimum heating power. The adjusting means W is composed mainly of the adjusting hole 26a and the fastening bolt 28.

  Incidentally, in the present embodiment, 13A gas and LP gas are used as the fuel gas. Therefore, the minimum heating power adjusted by the opening degree adjusting means W is a low calorific value of 13A gas and LP gas. It is the minimum heating power of 13A gas which is the side gas.

(Composition of safety valve)
When the safety valve 20 is described further, as shown in FIG. 5, a cylindrical safety valve storage portion 25 </ b> A is provided on the side portion of the casing 25.
As shown in FIG. 4, in the safety valve storage portion 25A, the valve body 30 is provided so as to be switchable between a closed position where it contacts the valve seat 31 and an open position where it is separated from the valve seat 31, and the valve body 30 is closed. A closing biasing spring 32 that biases the position back is provided.
Further, a slide type operating body 33 for pressing the valve body 30 to the open position is provided in a state where the return spring 34 is urged to return to a non-operating position where the valve body 30 is not pressed.

Accordingly, the safety valve 20 is configured to be urged to return to the closed state where the valve body 30 contacts the valve seat 31 and is moved from the non-operation position to the existence side of the valve body 30. The body 33 is configured to be operated in an open state in which the valve body 30 is separated from the valve seat 31.
As described above, the valve body 30 pressed to the open position is held by the electromagnetic holding portion 20G, so that the safety valve 20 is held in the open state.

(Configuration of linkage mechanism)
As shown in FIGS. 4 and 5, in the casing 25, in addition to the flow control valve 16 and the safety valve 20, an opening operation position for pushing the safety valve 20 into an open state and the safety valve 20 in a closed state are provided. A safety valve operating body 35 that can be switched to the permissible closing operation allowable position and a relay body 36 that rotates the movable plate 27 are incorporated.

  That is, a support pin 37 is supported below the fixed plate 26 so as to extend downward along the axis of the output shaft 18T of the stepping motor 18, and the movable plate 27, the safety valve operating body 35, and the support pin 37 are supported on the support pin 37. The relay body 36 is rotatably supported with the relay body 36 positioned between the movable plate 27 and the safety valve operating body 35, and the lower end of the support pin 37 faces the lower side of the safety valve operating body 35. A receiving piece 38 is provided to prevent the falling off.

  The upper end portion of the output shaft 18T of the stepping motor 18 is fitted to the fitting portion 35B on the bottom portion of the safety valve operating body 35 so as to rotate integrally, and between the movable plate 27 and the relay body 36, both are connected. A coil spring 39 that biases toward the separated side is disposed.

As shown in FIG. 5 and FIG. 7, a linking pin 40 is provided in a protruding state 36 a provided in a state of protruding outward from a part of the outer peripheral portion of the relay body 36 so as to extend upward. In addition, an insertion hole 41 into which the upper end side portion of the linkage pin 40 is slidable up and down is formed in a protruding portion 27 a provided in a state of protruding outward from a part of the outer peripheral portion of the movable plate 27.
That is, the relay body 36 and the movable plate 27 are linked so as to be integrally rotated by the linkage pin 40 while being relatively movable in the direction of the rotation axis Z.

As shown in FIGS. 5 and 7, the belt-like locking protrusion 36 </ b> A that protrudes downward on the outer peripheral side portion of the bottom portion of the relay body 36 has a protruding height that is positioned on the CW direction side along the CW direction. Corresponding to this, an engaging groove 35A into which the locking projection 36A is engaged is formed in the safety valve operating body 35.
Further, as shown in FIG. 8, a stopper 42 that receives the protrusion 36 a provided on the outer peripheral portion of the relay body 36 is provided on the casing 25.

  As the output shaft 18T rotates counterclockwise in the CCW direction, when the safety valve operating body 35 rotates in the CCW direction, the protrusion 36a provided on the outer peripheral portion of the relay body 36 becomes the stopper 42. When it is received, the latching protrusion 36A of the relay body 36 is in a state of riding on the upper surface side of the safety valve operating body 35, and the safety valve operating body 35 is configured to be allowed to rotate in the CCW direction. (See FIG. 7B).

  When the safety valve operating body 35 rotates in the CW direction as the output shaft 18T rotates in the clockwise direction, the locking projection 36A of the relay body 36 engages with the engagement groove of the safety valve operating body 35. The relay body 36 is configured to rotate integrally with the safety valve operating body 35 by being pressed by the end face of 35A (see FIG. 7A).

  That is, when the safety valve operating body 35 rotates in the CCW direction to operate the safety valve 20 in the open state, the rotation of the relay body 36 is stopped, thereby preventing the movable plate 27 from rotating in the CCW direction. When the safety valve operating body 35 rotates in the CW direction, the movable plate 27 is configured to rotate in the CW direction by the relay body 36 rotating together with the safety valve operating body 35.

  As shown in FIGS. 5 and 8, the safety valve operating body 35 includes a locking arm 35 a that locks and moves the slide type operating body 33 positioned at the non-operating position to the side where the valve body 30 exists. Thus, when the output shaft 18T rotates in the CCW direction from the set reference rotation phase A (see FIG. 6), the slide type operating body 33 positioned at the non-operating position is locked and moved to the existence side of the valve body 30. (See FIG. 9).

  That is, the linkage mechanism R that links the output shaft 18T of the stepping motor 18 with the movable plate 27 and the safety valve operating body 35 is mainly configured with the relay body 36, the linkage pin 40, and the like.

As shown in FIG. 8, in the linkage mechanism R, when the output shaft 18T rotates to the set reference rotation phase A (see FIG. 6), the gas flow opening degree of the stove flow rate adjustment valve 16A becomes the fully closed opening degree. In this way, the output shaft 18T, the movable plate 27, and the safety valve operating body 35 are linked so that the movable plate 27 is operated and the safety valve operating body 35 is operated to the closing operation allowable position. .
Incidentally, when the output shaft 18T rotates to the set reference rotation phase A, the protrusion 36a of the relay body 36 is separated from the stopper 42.

  As shown in FIG. 10, the linkage mechanism R opens the gas flow opening when the output shaft 18T rotates in the forward and reverse directions within the one rotation range (the CW direction side range) from the set reference rotation phase A. In order to change the degree to a flow opening between the minimum flow opening and the previous maximum flow opening, the movable plate 27 is moved forward and backward along the moving direction for adjusting the gas amount, and FIG. As shown in FIG. 9, when the output shaft 18T rotates from the set reference rotation phase A to the other side range in the rotational direction (range on the CCW direction side), the movable plate is moved to a position where the gas flow opening degree becomes the fully closed opening degree. 27, the output shaft 18T and the movable plate 27 are linked to each other.

Further, as shown in FIG. 10, the linkage mechanism R maintains the safety valve operating body 35 at the closing operation allowable position when the output shaft 18T rotates to one side range (CW direction side range).
Then, as shown in FIG. 9, the linkage mechanism R rotates to the safety valve operating phase F (see FIG. 6) on the side away from the set reference rotation phase A in the other side range (CCW direction side range). In this case, the output shaft 18T and the safety valve operating body 35 are linked to operate the safety valve operating body 35 to the opening operation position.

  The opening position of the safety valve operating body 35 is a state in which the safety valve operating body 35 is rotated in a phase range in which the locking arm 35a locks and moves the sliding operation body 33. The closing operation allowable position of the body 35 is a state in which the safety valve operating body 35 is rotated in a phase range in which the locking arm 35 a does not lock the sliding operation body 33.

(About the rotation phase of the output shaft)
FIG. 6 shows a state in which the output shaft 18T rotates to the set reference rotation phase A. In this set reference rotation phase A, the gas outflow holes 26A of the fixed plate 26 are connected to the gas flow holes 27A. In addition, the gas flow opening degree does not match the gas flow groove 27B, and the gas flow opening degree is a fully closed opening degree.
In FIG. 6, the rotation phase indicated by B is a rotation phase (hereinafter, abbreviated as “minimum flow phase”) that sets the flow opening degree to the minimum flow opening degree. This is the rotational phase to achieve the minimum target heating power.

The rotation phase indicated by C is a rotation phase (hereinafter, abbreviated as 13A minimum flow phase) that makes the minimum target heating power when 13A gas is used as gas fuel. In addition, this minimum target thermal power respond | corresponds to the "small thermal power" in the rice cooking operation process mentioned later.
Incidentally, the flow opening degree in the 13A minimum flow phase C is adjusted by the opening degree adjusting means W described above.

  The rotational phase indicated by D is a rotational phase (hereinafter, abbreviated as “maximum flow phase”) that sets the flow opening to the maximum flow opening, and is maximum when LP gas and 13A gas are used as gas fuel. This is the rotational phase that makes the target thermal power.

A rotation phase indicated by E is a rotation phase (hereinafter referred to as an ignition rotation phase) for setting a flow opening degree when the combustor 1 is ignited when 13A gas is used as gas fuel.
The thermal power in this ignition phase is an intermediate target thermal power, and corresponds to “medium thermal power” in the rice cooking operation process described later.

  The relative positional relationship between the gas outflow hole 26A, the gas flow hole 27A, and the gas flow concave groove 27B in the rotational phase indicated by B is the position of the gas outflow hole 26A indicated by a two-dot chain line in FIG. Is the position where the movable plate 27 alone is rotated in the CW direction by 22 degrees from the figure, and the gas outflow hole 26A, the gas flow hole 27A and the gas flow concave groove 27B in the rotation phase indicated by C The relative positional relationship of FIG. 6 is the positional relationship in which the position of the gas outflow hole 26A indicated by the two-dot chain line in FIG. 6 is left as it is, and only the movable plate 27 is rotated in the CW direction by 90 degrees from the figure. The relative positional relationship between the gas outflow hole 26A, the gas flow hole 27A, and the gas flow concave groove 27B in the rotational phase indicated by D is the same as the position of the gas outflow hole 26A indicated by the two-dot chain line in FIG. of In the figure, only the movable plate 27 is rotated by 240 degrees in the CW direction, and the relative relationship between the gas outflow hole 26A, the gas flow hole 27A, and the gas flow concave groove 27B in the rotation phase indicated by E is shown. The positional relationship is such that the position of the gas outflow hole 26A indicated by the two-dot chain line in FIG. 6 remains as it is, and only the movable plate 27 is rotated 165 degrees in the CW direction from the drawing.

The rotational phase indicated by G is a rotational phase indicating the rotational limit of the output shaft 18T in the CCW direction (hereinafter abbreviated as CCW direction limit), and the rotational phase indicated by H is the rotational limit of the output shaft 18T in the CW direction. Is a rotational phase (hereinafter abbreviated as CW direction limit).
The CCW direction limit G is configured to be achieved by receiving an operating body 33 for operating the safety valve 20 in an open state by a receiving body 43 (see FIG. 8) provided in the safety valve housing portion 25A. .
The CW direction limit H is achieved by the protrusion 36a being received by the above-described stopper 42 when the relay body 36 rotates in the CW direction (see FIG. 10).

  In FIG. 6, when the set reference rotation phase A is 0 degree, the CW direction is a positive angle, and the CCW direction is a negative angle, the minimum conduction phase B is from the set reference rotation phase A. The minimum flow phase C for 13A is a phase rotated 90 degrees from the set reference rotation phase A, and the maximum flow phase D is a phase rotated 240 degrees from the set reference rotation phase A. Yes, the ignition rotation phase E is a phase rotated 165 degrees from the set reference rotation phase A, and the safety valve operation phase F is a phase rotated −48 degrees from the set reference rotation phase A.

  The CCW direction limit G is a phase rotated −70 degrees from the set reference rotation phase A, and the CW direction limit H is a phase rotated 280 degrees (−80 degrees) from the set reference rotation phase A.

Further, in FIG. 6, a range indicated by K is an undetectable range in which the potentiometer PM cannot be detected.
That is, the potentiometer PM has an angle corresponding to the rotational phase of the output shaft 18T between the phase rotated by 256.5 degrees from the set reference rotational phase A and the phase rotated by -76.55 degrees from the set reference rotational phase A. Is configured to detect.

(Gas fuel flow in the control unit for high thermal power)
Next, the flow of gas fuel in the high thermal power control unit VA will be described. As shown in FIGS. 4 and 5, the gas inlet 44 is provided in the safety valve housing portion 25 </ b> A of the casing 25.
The gas that has flowed from the gas inlet portion 44 into the safety valve housing portion 25A flows through the formation portion of the valve seat 31 and flows into the casing 25 when the valve body 30 is located at the open position.

The gas flowing into the casing 25 flows to the lower side of the movable plate 27 through the location where the safety valve operating body 35 and the relay body 36 are arranged, and then through the gas flow hole 27A, the movable plate 27 and the fixed plate 26. Fluid during.
The gas flowing between the movable plate 27 and the fixed plate 26 flows out from the gas outflow hole 26A when the gas outflow hole 26A matches the gas flow hole 27A or the gas flow concave groove 27B. Become.
As shown in FIG. 4, a sealing O-ring 45 that suppresses the gas that has flowed inside the casing 25 from leaking to the presence side of the stepping motor 18 is provided at the insertion portion of the output shaft 18 </ b> T in the casing 25. , And is provided in a state of being externally fitted to the output shaft 18T.

(Contents stored in the operation control unit)
In the storage unit Um of the operation control unit U, an opening indicating the relationship between the gas flow opening degree and the rotation phase (rotation angle) of the output shaft 18T in a state where the output shaft 18T is rotated in the CCW direction as the reference rotation direction. The degree related information is stored.
That is, when the output shaft 18T is rotated from the safety valve operation phase F to the maximum flow phase D, and then the output shaft 18T is rotated from the maximum flow phase D to the safety valve operation phase F, the output shaft 18T rotates. When the relationship between the phase (rotation angle) and the gas flow opening was measured by experiment, it was found that hysteresis exists due to the coupling flexibility (play) of the linkage mechanism R as shown in FIG.

This hysteresis varies depending on the individual error for each device, and the median value of the variation range was found to be about 11 degrees, for example, by experiment.
In the present embodiment, since such hysteresis exists, the output shaft 18T is rotated in the CCW direction as the opening relationship information indicating the relationship between the opening for gas flow and the rotation phase (rotation angle) of the output shaft. The relationship in the state was remembered.
Specifically, the relationship between the rotation angle (rotation phase) based on the set reference rotation phase A of the output shaft 18T and the gas flow opening is stored as opening relationship information.
Incidentally, in this embodiment, the memory | storage part Um functions as an opening degree relationship memory | storage means.

Further, although not shown, the storage unit Um of the operation control unit U stores the relationship between the rotation angle (rotation phase) based on the set reference rotation phase A of the output shaft 18T and the output value of the potentiometer PM. It is configured.
Incidentally, the output of the potentiometer PM is, for example, 0.000 V at the CW direction limit H, 0.060 V at the CCW direction limit G, 0.260 V at the safety valve operation phase F, and 0. 0 at the set reference rotation phase A. 690V, 0.892V at the minimum flow phase B, 1.500V at the minimum flow phase C for 13A, and 2.850V at the maximum flow phase D.
“V” is an abbreviation for bolt.

  Further, in the present embodiment, the storage unit Um of the operation control unit U has a relationship between the thermal power at each stage and the rotation angle (rotation phase) with reference to the set reference rotation phase A of the output shaft 18T for 13A gas. Is stored as opening degree change information that defines the relationship between the target thermal power level and the flow opening degree, and similarly, the thermal power at each stage and the set reference rotation phase A of the output shaft 18T for LP gas are used as a reference. The relationship with the rotation angle (rotation phase) is stored as opening change information that defines the relationship between the magnitude of the target heating power and the flow opening.

  The opening change information for 13A gas is determined between the minimum flow phase C for 13A and the maximum flow phase D, and the opening change information for LP gas is the minimum flow phase B. And the maximum flow phase D.

(Stepping motor control)
The operation control unit U is configured with a microcomputer as a main part, and as described above, a fire extinguishing command, an ignition command, and a thermal power adjustment command (thermal power increase command, thermal power decrease command) for each of the three combustors 1. The combustion of the stove burner 1 is controlled by determining.
That is, the operation control unit U controls the operation of the stepping motor 18 on the basis of the fire extinguishing command, the ignition command, the heating power adjustment command, and the detection information of the potentiometer PM in order to control the combustion of the burner 1. It will function as a motor controller.

Next, the control operation of the stepping motor 18 will be described, but the control for the three stove stepping motors 18A, 18B, and 18C is performed in the same manner.
In addition, it is assumed that 13A gas is set with the gas type setting switch GE.

The operation control unit U energizes the stepping motor 18 when moving the movable plate 27, but stops the energization of the stepping motor 18 when the movable plate 27 is not moved. It is comprised so that the action | operation of 18 may be controlled.
That is, as shown in FIG. 12, the stepping motor 18 of the present embodiment is configured in a two-phase excitation type, and when the stepping motor 18 is driven, a pulse current is supplied to the A pole and the B pole. However, when the stepping motor 18 is stopped, the energization of the pulse current is stopped.

FIG. 13 shows that in the ignition process described later, the stepping motor 18 is energized when the output shaft 18T is rotated in the CCW direction from the set reference rotation phase A toward the safety valve operating phase F and then rotated in the CW direction. It shows the pulse current.
As shown in FIG. 13, when the operation control unit U rotates the output shaft 18T to the safety valve operation phase F in the ignition process, the operation control unit U stops the rotation of the output shaft 18T and the output shaft 18T is driven by an external force. An output shaft holding process for energizing the stepping motor 18 with a stop holding current for checking the rotation for a set hold time is executed.

  Further, in the ignition process, the operation control unit U has a higher speed for rotating the output shaft 18T after execution of the output shaft holding process than the speed for rotating the output shaft 18T from the set reference rotation phase A to the safety valve operating phase. Thus, the excitation switching speed of the stepping motor 18 is controlled.

Specifically, as shown in FIG. 15, the excitation switching speed is set to 200 PPS until reaching −20 degrees from the set reference rotation phase A, and from −20 degrees to the safety valve operation phase F (−48 degrees). The excitation switching speed is 150 PPS.
When the output shaft 18T is rotated after the output shaft holding process is executed, the excitation switching speed is first controlled after the excitation switching speed is changed to 300PPS and then the excitation switching speed is changed to 500PPS. ing.
Note that “PPS” is an abbreviation for pulse per second.

(Open loop control)
The operation control unit U sets the number of pulses applied to the stepping motor 18 to move the movable plate 27 in a state where the output shaft 18T rotates in the CCW direction (reference rotation direction) and rotates to the set reference rotation phase A. When the rotation direction of the stepping motor 18 is changed in the reference management mode, the preset number of play correction pulses is added based on the opening degree relationship information described above. The stepping motor 18 is configured to be driven.

  Specifically, the operation control unit U sets the target pulse number to be applied to the stepping motor 18 to change from the current gas flow opening to the target flow opening, and the rotation direction of the output shaft 18T in the previous rotation. If the direction is not changed from the direction, the number of pulses is determined based on the opening relation state, and if the rotation direction of the output shaft 18T is changed from the previous rotation direction, the opening degree state is used. The step number is determined by adding the correction pulse number for play correction set in advance corresponding to the linkage flexibility of the linkage mechanism R that links the output shaft 18T and the movable plate 27 to the required pulse number. A normal drive process for driving the motor 18 is executed.

  Incidentally, since the linkage accommodation of the linkage mechanism R varies depending on the individual error for each device as described above, in this embodiment, the number of play correction correction pulses is changed by the predicted variation of the linkage accommodation. It is determined in correspondence with the median value of the range (for example, 11 °).

  In addition, when the operation control unit U rotates the output shaft 18T in the opposite direction (CW direction) to the CCW direction (reference rotation direction) in order to move the movable plate 27, the setting start condition is satisfied. It is configured to execute high-precision driving processing.

  As shown in FIG. 17, the high-precision driving process is performed in such a way that the output shaft 18T is in the direction opposite to the CCW direction (reference rotation direction) with the initial number of pulses obtained by adding a preset number of overdriving pulses to the target number of pulses ( The stepping motor 18 is driven in the rotational direction rotating in the CW direction), and then the output shaft 18T is moved in the CCW direction (reference rotational direction) at the latter number of pulses obtained by adding the number of correction pulses and the number of overdrive pulses. This is a process of driving the stepping motor 18 in the direction of rotation that rotates in the direction of.

In the present embodiment, as described above, in response to the correction pulse number being set corresponding to the median value of the predicted fluctuation range of the linkage accommodation of the linkage mechanism R, the overdrive pulse number is It is set corresponding to the difference between the median value and the maximum value of the predicted fluctuation range of the linkage flexibility of the linkage mechanism R.
That is, when the linkage accommodation of the linkage mechanism R was measured for a large number of devices, it was found that the expected fluctuation range of the linkage accommodation was, for example, a range of 9 ° to 13 °.

  Therefore, in the present embodiment, as described above, the number of correction pulses is determined in correspondence with 11 °, which is the median value of the predicted fluctuation range, and the overdrive pulse number is set in the fluctuation range. It was determined according to the difference (2 °) between the median value of 11 ° and the maximum value of 13 °. Note that the number of overdriving pulses may be determined in correspondence with a large value equal to or greater than the difference between the median value and the maximum value of the fluctuation range.

  Incidentally, since the stepping motor 18 of this embodiment rotates 0.395 degrees in one step, in this embodiment, the correction pulse number is set to 28 pulses, and the overdrive pulse number is set to 5 pulses. Set to pulse.

  Further, in the present embodiment, when the operation control unit U is instructed as the gas flow opening for the ignition flow opening of the cono burner 1, that is, the ignition command is instructed, When the output shaft 18T is controlled to the ignition rotation phase E for ignition, it is determined that the setting start condition is satisfied, and the high-precision driving process is executed (see FIG. 15).

  As is apparent from the above description, the operation control unit U basically stores the stored information stored in the storage unit Um and the output shaft 18T in one step from the start of the ignition process to the end of the fire extinguishing process. The stepping motor 18 is driven in a so-called open-loop control mode in which the number of pulses applied to the stepping motor 18 is determined based on the rotation angle.

  More specifically, when the ignition command is issued and the output shaft 18T is rotated from the set reference rotation phase A to the safety valve operation phase F (−48 degrees), the output shaft 18T positioned at the set reference rotation phase A is output. Since the rotation is stopped in the reference rotation direction (CCW direction), the rotation direction of the output shaft 18T is not changed from the previous rotation direction, so 48 is divided by 0.395. The required 122 steps are determined as the required number of steps (target pulse number to be applied), and the stepping motor 18 is driven in the CCW direction.

  When the output shaft 18T rotated from the set reference rotation phase A to the safety valve operation phase F is rotated from the safety valve operation phase F (−48 degrees) to the ignition rotation phase E (165 degrees), the output shaft 18T Since the rotation direction is changed from the previous rotation direction and the high-precision driving process is executed, 213 obtained by adding 48 and 165 is divided by 0.395 to obtain 539 steps. 572, which is obtained by adding 28 correction pulses and 5 overdrive pulses, is determined as the required number of steps (initial pulse number), and the stepping motor 18 is driven in the CW direction. 33 adding 5 pulses is determined as the required step number (late pulse number), and the stepping motor 18 is driven in the CCW direction (reference rotation direction) ( Reference 15).

  For example, when the output shaft 18T rotated from the safety valve operating phase F to the ignition rotation phase E is rotated from the ignition rotation phase E (165 degrees) to the maximum conduction phase (240 degrees), 240 103, which is obtained by subtracting 165 from 75 and dividing it by 0.395, and adding the number of correction pulses 28 to 103, is determined as the required number of steps (target pulse number to be applied), and the stepping motor 18 is moved in the CW direction. Will be driven to.

  Further, for example, when the output shaft 18T rotated from the safety valve operation phase F to the ignition rotation phase E is rotated from the ignition rotation phase E (165 degrees) to the 13A minimum flow phase C (90 degrees). The 190 steps obtained by subtracting 90 from 165 divided by 0.395 are determined as the required number of steps (number of target pulses to be applied), and the stepping motor 18 is driven in the CCW direction.

  Incidentally, the operation control unit U performs stepping to move and operate the movable plate 27 in such a manner that the output shaft 18T is managed based on the state in which the output shaft 18T rotates in the CCW direction (reference rotation direction) and rotates to the set reference rotation phase A. The number of pulses to be applied to the motor 18 is determined when the output shaft 18T is rotated to the set reference rotation phase A when the output shaft 18T is rotated based on the detection information of the potentiometer PM by a phase adjustment process described later. When the output shaft 18T is rotated to the target rotation phase while positioning in the rotational phase A, it simply means determining the number of pulses required to rotate the output shaft 18T by the target amount. It is.

(Phase adjustment processing)
When the stepping motor 18 is operated so that the output shaft 18T becomes the set reference rotation phase A, the operation control unit U shifts the output shaft 18T from the set reference rotation phase A based on the detection information of the potentiometer PM. When it is determined that the output shaft 18T is rotated, the phase adjustment process for driving the stepping motor 18 so as to rotate the output shaft 18T to the set reference rotation phase A is executed.

  That is, when the output value of the potentiometer PM (0.690 V) when the output shaft 18T becomes the set reference rotation phase A and when the stepping motor 18 is operated so that the output shaft 18T becomes the set reference rotation phase A. If the difference from the current value of the potentiometer PM is equal to or greater than the set allowable range, the stepping motor 18 is driven to rotate the output shaft 18T to the set reference rotation phase A.

Since the stepping motor 18 of this embodiment rotates 0.395 degrees in one step, the above setting range is set as a range larger than +0.395 degrees and smaller than −0.395 degrees. ing.
If the output shaft 18T exceeds the set reference rotation phase A, the output shaft 18T is once rotated in the CW direction to return to the front side of the set reference rotation phase A, and then the set reference rotation phase A. Rotate in the CCW direction toward

  That is, as described above, the operation control unit U determines the number of pulses applied to the stepping motor 18 to move the movable plate 27 by rotating the output shaft 18T in the CCW direction (reference rotation direction). The stepping motor 18 is driven in a so-called open-loop control mode in which the stepping motor 18 is driven based on the information stored in the storage unit Um. Therefore, when the output shaft 18T is rotated to the set reference rotation phase A, when the rotation phase of the output shaft 18T is deviated from the set reference rotation phase A based on the detection information of the potentiometer PM, The output shaft 18T is corrected to the state rotated to the set reference rotation phase A.

(Combustion control of operation control unit)
Next, although the combustion control of the operation control unit U will be described, the control contents for each of the three stove burners 1 are the same, and therefore, in the following description, the stove burner 1 will be described as being a high thermal power burner 1A. .
In addition, it is assumed that 13A gas is set with the gas type setting switch GE.

  The operation control unit U performs, as basic control with respect to the combustor 1, an ignition process executed based on the ignition command, a fire extinguishing process executed based on the fire extinguishing command, and a thermal power adjustment process executed based on the thermal power adjustment command. In addition, when the abnormality occurrence information is input, the fire extinguishing process is executed.

  Incidentally, the abnormality occurrence information refers to the case where the ignition detection sensor J detects that the combustor 1 is extinguished even though the combustor 1 is burning, or the cooking container heated by the combustor 1. This is the case when an abnormally high temperature is detected by a temperature detection sensor PS (see FIG. 1) that detects the temperature.

(Ignition processing)
As shown in FIG. 15, the ignition process is performed by operating the safety valve operating body 35 to the opening operation position, then operating the safety valve operating body 35 to the closing operation allowable position, and setting the gas flow opening degree for ignition. A process for operating the stepping motor 18 to change to a flow opening degree corresponding to the magnitude of the thermal power, and energizing the electromagnetic holding part 20G to hold the safety valve 20 in an open state to operate the ignition igniter L. In addition, it is a process of executing a process of detecting ignition by the ignition detection sensor J.

In this ignition process, when the original electromagnetic valve 15 is closed, an operation of opening the original electromagnetic valve 15 is performed.
When the original solenoid valve 15 is opened, first, a large current for adsorption and a small current for holding are energized, and then the energization of the large current for adsorption is stopped.

Specifically, the operation process of the stepping motor 18 in the ignition process is such that after the output shaft 18T is rotated from the set reference rotation phase A to the safety valve operation phase F, the gas flow opening is set to the magnitude of the ignition thermal power. In order to obtain a corresponding opening degree, processing for operating the output shaft 18T to the ignition rotation phase E is executed.
Incidentally, when the output shaft 18T is rotated from the set reference rotation phase A to the safety valve operation phase F, as described above, the output shaft holding process for energizing the stepping motor 18 for the set hold time is executed. In addition, when the output shaft 18T is rotated from the safety valve operation phase F to the ignition rotation phase E, the high-precision drive process is executed as described above.

(Thermal power adjustment processing)
The thermal power adjustment process is a process of changing to a flow opening degree corresponding to the magnitude of the instructed target thermal power when a thermal power control command is commanded after execution of the ignition process. While rotating the output shaft 18T between the minimum flow phase C and the maximum flow phase D, the gas flow opening is changed to a flow opening corresponding to the target heating power.

  Incidentally, in FIG. 15, when the output shaft 18T is rotated from the ignition rotation phase E to the heating power 9 of the maximum flow phase D, the output shaft 18T is changed from the ignition rotation phase E to the minimum flow phase C for 13A. The case where the rotating power is rotated to the eighth heating power 8 after the rotation is illustrated. When the rotation direction of the output shaft 18T is changed from the previous rotation direction, the stepping motor 18 is moved to move the movable plate 27. The number of pulses to be applied to is determined in the form of adding the number of correction pulses for play correction.

(Fire extinguishing process)
The fire extinguishing process is a process of changing the gas flow opening to the fully closed opening when a fire extinguishing command is issued. Specifically, as shown in FIG. 16, the output shaft 18T is set to the set reference rotation phase A. The process of rotating the safety valve 20 and the process of closing the safety valve 20 are executed.
Incidentally, when the output shaft 18T is rotated to the set reference rotation phase A when it is determined that the output shaft 18T is deviated from the set reference rotation phase A, the output shaft 18T is set to the set reference rotation as described above. A phase adjustment process for driving the stepping motor 18 to rotate to the phase A is executed.

  Specifically, the operation process of the stepping motor 18 in the fire extinguishing process is, specifically, when the rotation phase of the output shaft 18T is on the CW direction side with respect to the set reference rotation phase A, first, the output shaft 18T is moved to the minimum passage for 13A. Then, the rotation of the output shaft 18T to the set reference rotation phase A is executed, and the rotation phase of the output shaft 18T is closer to the CCW direction side than the set reference rotation phase A. In some cases, a process of rotating the output shaft 18T to the set reference rotation phase A is executed.

Then, when the rotation phase of the output shaft 18T is on the CW direction side with respect to the set reference rotation phase A, the operation control unit U detects ignition when rotating the output shaft 18T to the 13A minimum flow phase C. When fire extinguishing is not detected by the sensor J, a safety valve failure determination process for determining that the safety valve 20 is in failure is executed.
In addition, after the safety valve failure determination process is executed, the original solenoid valve 15 is closed when the other stove burner 1 or grill burner 2 is not used.

  In addition, when the rotation phase of the output shaft 18T is on the CCW direction side with respect to the set reference rotation phase A, the operation control unit U first outputs an output when rotating the output shaft 18T to the set reference rotation phase A. The shaft 18T is rotated in the CW direction until the rotation phase of the shaft 18T exceeds the set reference rotation phase A, and then the output shaft 18T is rotated in the CCW direction until the rotation phase of the output shaft 18T reaches the set reference rotation phase A.

This fire extinguishing process is also executed when abnormality occurrence information such as detection of fire extinguishing is input by the ignition detection sensor J. In the fire extinguishing process corresponding to this abnormality occurrence information, output is performed. Whether the rotational phase of the shaft 18T is on the CW direction side with respect to the set reference rotational phase A or the rotational phase of the output shaft 18T is on the CCW direction side with respect to the set reference rotational phase A, the output shaft 18T is immediately Is rotated to the set reference rotation phase A, and the original solenoid valve 15 is immediately closed.
Incidentally, in the fire extinguishing process, since the output shaft 18T is rotated to the set reference rotation phase A, the safety valve operating body 35 is operated to the closing operation allowable position.

(Flow of combustion control)
The flow of combustion control will be described based on the flowchart shown in FIG.
First, it is determined whether or not the burner 1 is in combustion (# 1), and when it is determined that it is not in combustion, it is determined whether or not the ignition process is being performed (# 2). In step S3, it is determined whether or not an ignition command is commanded by operating the operation tool 6 (# 3). If the command is not commanded, the process proceeds to # 1.

When it is determined that the ignition command is instructed by the process of # 3, an ignition process for igniting the combustor 1 is executed (# 4), and then the process proceeds to # 1.
If it is determined that the ignition process is being performed by the process of # 2, it is determined whether or not a fire extinguishing command is commanded by operating the operation tool 6 (# 5). Shifts to the process of # 4, and when a fire extinguishing command is instructed, it shifts to the fire extinguishing process of # 6.

When it is determined by the processing of # 1 that combustion is in progress, it is determined whether or not an abnormal state such as the burner 1 has extinguished has occurred (# 7). Transition to processing.
If it is determined in step # 7 that no abnormality has occurred, it is determined whether or not a fire extinguishing command is commanded by operating the operation tool 6 (# 8). 6 will be transferred to the fire extinguishing process.

  If it is determined in step # 8 that the fire extinguishing command is not issued, it is determined whether or not the thermal power adjustment process is in progress (# 9). When it is determined that the command is issued (# 10), the thermal power adjustment process (# 11) is executed.

(Cooking rice processing)
As described above, the operation control unit U is configured to execute the rice cooking operation process when an ignition command is issued in a state where the “rice cooking operation” is set in the stove setting operation unit SC.
And the operation control part U discriminate | determines that the setting start conditions mentioned above were satisfy | filled, and performs a highly accurate drive process, when increasing a gas flow opening degree during execution of a rice cooking operation process. It is configured.

Next, the rice cooking operation process will be described with reference to FIG. 18, but in the following description, it is assumed that 13A gas is used as the gas fuel.
Further, as described above, the heating power of the minimum flow phase C for 13A corresponds to “small heating power” for cooking rice, and the heating power of the rotation phase E for ignition corresponds to “medium heating power” for cooking rice. .
In FIG. 18, “small thermal power” is described as thermal power “small”, and “medium thermal power” is described as thermal power “medium”.

  Moreover, the case where a rice cooking operation process is performed using the standard burner 1B as the stove burner 1 is described. In this case, the “small heating power” is, for example, 400 kcal / h (0.465 kW), “Medium heating power” is, for example, 1135 kcal / h (1.32 kW).

  Furthermore, the rice cooking operation process uses the detected temperature of the temperature detection sensor PS that detects the temperature of the pan bottom placed on the Gotoku 5, and in FIG. 18, the detected temperature of the temperature detection sensor PS is plotted on the vertical axis. , Described as “temperature”. The horizontal axis in FIG. 18 indicates the elapsed time.

  In the rice cooking operation process, the time when the ignition command is commanded in the state where “rice cooking operation” is set in the stove setting operation unit SC, specifically, the time when the ignition detection sensor J detects ignition is heated. The thermal power at this time is “medium thermal power” corresponding to the thermal power of the ignition rotation phase E.

  Thereafter, when the detection temperature of the temperature detection sensor PS reaches 90 degrees (the water temperature in the pan is about 60 ° C.), the thermal power is switched to “small thermal power” at that time t1, and the water absorption process for the elapsed time from the heating start time t0. Until the time P (for example, 600 seconds) is reached, heating with “small heating power” is continued.

When the water absorption process time P elapses, at the time t2, the “small heating power” is switched to the “medium heating power”, and the heating is continued with the “medium heating power”.
During this heating, an equilibrium state in which the detected temperature of the temperature detection sensor PS is substantially constant is determined, and the detected temperature at that time is stored as the equilibrium temperature Te.
That is, for example, for every fixed determination period, it is determined whether the temperature difference within the determination period is within a predetermined temperature range, and when the temperature difference within the determination period is within a predetermined temperature range, It is determined that an equilibrium state has been reached, and the temperature during the determination period, for example, the temperature at the end of the determination period is defined as the equilibrium temperature Te.

After the water absorption process time P has elapsed, heating at “medium thermal power” is continued until the temperature detected by the temperature detection sensor PS reaches the thermal power switching temperature TC determined by the following formula, and then switched to “small thermal power”. It is done.
Thermal power switching temperature = equilibrium temperature + β where β = 25
If the equilibrium temperature Te is, for example, 102 ° C., the thermal power switching temperature Tc is 127 ° C. (= 102 + 25).

Heating in a state where the thermal power is switched to “small thermal power” is continued until the detected temperature of the temperature detection sensor PS reaches the rice cooking end temperature Ts obtained by the following formula, and the detected temperature of the temperature detection sensor PS is the rice cooking end temperature. At time t4 when Ts is reached, the burner 1 is extinguished and the rice cooking operation process is completed.
Rice cooking end temperature = equilibrium temperature + γ where γ = 30
If the equilibrium temperature Te is 102 ° C., for example, the rice cooking end temperature Ts is 132 ° C. (= 102 + 30).

  The rice cooking operation process is executed as described above. In order to perform the ignition process of the burner 1, when changing from the reference rotation phase to the ignition rotation phase E, or to increase the heating power of the burner 1, “ When changing from “small heating power” to “medium heating power”, the high-accuracy driving process is executed, so changing to the ignition rotation phase E (“medium heating power”) is performed with high accuracy.

By the way, 70-80% of rice is starch, and normally it is gelatinized by keeping the condition at 100 ° C for 20 minutes or more with moisture of 30% or more, but the heating power for rice cooking was set as above When the rice is removed from the thermal power, the rice is turned into α and the rice is cooked, but the cooked state of the cooked rice becomes worse as shown below.
If the heating power for rice cooking (especially “medium heating power”) is large, the spilling from the cooking pot tends to occur.
Moreover, when the thermal power for rice cooking (especially "medium thermal power") is large, the time to reach the rice cooking end temperature Ts is shortened, and the cooking is hardened.
On the other hand, when the thermal power for cooking (especially “medium thermal power”) is small, the time until the rice cooking end temperature Ts is reached becomes long, and the cooking becomes soft.

[Another embodiment]
Hereinafter, other embodiments are listed.

(1) In the above-described embodiment, the case where the present invention is applied to a gas stove having three stove burners 1 has been exemplified. For example, the present invention is applied to a gas stove having one stove burner 1, etc. The form of the gas stove to which the present invention is applied can be variously changed.

(2) In the above embodiment, the case where the movable plate 27 rotates around the rotation axis Z and the flow rate adjusting valve 16 as the gas amount adjusting unit is configured is exemplified. The present invention can also be applied to a gas amount adjusting unit that is set in a direction along a straight line and in which the movable plate 27 slides.

(3) In the above-described embodiment, the case of selecting and using 13A city gas and LP gas as the type of gas fuel has been exemplified, but the present invention can also be applied to the case of using other types of gas fuel. Is.
And it may be implemented in a form in which there are three or more kinds of gas fuels to be selected and used, or in a form using only one kind of gas fuel such as 13A city gas. May be.

(4) In the above embodiment, the case where the set reference rotation phase A of the output shaft 18T is set to the rotation phase for operating the gas flow opening to the fully closed opening is exemplified. The gas flow opening in the set reference rotation phase A can be variously changed, for example, the phase A is set to a rotation phase corresponding to the minimum flow opening in the flow rate adjusting valve 16 as the gas amount adjusting unit.

(5) In the above embodiment, the case where the safety valve 20 that is operated to be opened by the stepping motor 18 is illustrated, but the safety valve 20 may not be provided.
In this case, rotating the output shaft 18T toward the CCW direction side with respect to the set reference rotation phase A is omitted.

(6) In the above embodiment, the potentiometer PM is exemplified as the rotation phase detection means. However, the rotation phase detection means can use various detection sensors such as an absolute rotary encoder.

(7) In the above embodiment, the rotation phase of the output shaft 18T and the opening for gas flow when the output shaft 18T of the stepping motor 18 is moved from the set reference rotation phase A to the reference rotation direction (CCW direction). In determining the opening degree relationship information indicating the relationship, the rotation phase of the output shaft 18T is exemplified as the rotation angle with respect to the set reference rotation phase A. For example, the rotation phase of the output shaft 18T is stepped. The number of steps of the motor 18 (number of pulses) may be set.

(8) In the above embodiment, the case where the reference rotation direction is defined as the “CCW direction” in which the opening degree is increased is illustrated, but the reference rotation direction is changed to the “CW direction” in which the opening degree is decreased. You may implement with the form which determines.

16 Gas amount adjustment unit 26 Fixed plate 27 Movable plate 18 Stepping motor A Setting reference rotation phase M Combustion state setting unit PM Rotation phase detection means R Linkage mechanism U Motor control unit Z Rotation axis

Claims (6)

By moving the movable plate in the moving direction for gas amount adjustment with respect to the fixed plate, the opening for gas flow is opened between the flow opening for minimum gas flow and the flow opening for maximum gas flow. And the movable plate is moved in one direction along the moving direction for adjusting the gas amount, thereby increasing the flow opening degree. And, the movable plate is operated to move in the other direction along the gas amount adjustment moving direction, thereby reducing the flow opening degree and making the fully closed opening amount,
A stepping motor that moves the movable plate in the gas amount adjusting movement direction;
A motor control unit that controls the operation of the stepping motor to change the gas flow opening to the target flow opening based on the magnitude of the target heating power and the setting information of the combustion state setting unit that instructs the combustion stop And a combustion gas amount control device provided with
Rotation phase detection means for detecting the rotation phase of the output shaft of the stepping motor is provided,
The motor control unit is
When the stepping motor is operated so that the output shaft has a set reference rotation phase, it is determined based on detection information of the rotation phase detection means that the output shaft is deviated from the set reference rotation phase. In this case, a phase adjustment process for driving the stepping motor to rotate the output shaft to the set reference rotation phase is configured.
Opening degree relationship information storage means for storing opening degree relation information indicating a relation between the opening degree for gas flow and the rotation phase of the output shaft in a state where the output shaft of the stepping motor is moved in a reference rotation direction; Provided,
The motor control unit is
The target number of pulses applied to the stepping motor to change from the current gas flow opening to the target flow opening is set to open when the rotation direction of the output shaft is not changed from the previous rotation direction. In the form of the number of pulses obtained based on the degree relation information, and when changing the rotation direction of the output shaft from the previous rotation direction, the number of pulses obtained based on the opening degree relation information, A normal drive process for driving the stepping motor in a form of a pulse number obtained by adding a preset number of correction pulses for play correction corresponding to the linkage flexibility of the linkage mechanism that links the output shaft and the movable plate And is configured to perform
When the setting start condition is satisfied when the output shaft is rotated in the direction opposite to the reference rotation direction in order to change to the target flow opening, the preset overdrive pulse number is set to the target pulse number. The stepping motor is driven in the rotation direction in which the output shaft rotates in the direction opposite to the reference rotation direction with the initial pulse number added to the number of pulses, and then the correction pulse number and the overdrive pulse number A combustion gas amount control device configured to execute a high-precision driving process for driving the stepping motor in a rotation direction in which the output shaft rotates in the reference rotation direction with the number of late pulses added . The number of correction pulses is set corresponding to the median value of the predicted fluctuation range of the linkage accommodation,
The combustion gas amount control device according to claim 1, wherein the number of pulses for overdrive is set corresponding to a value equal to or greater than a difference between the median value and the maximum value of the fluctuation range. The gas amount adjusting unit is provided corresponding to a stove burner equipped in a gas stove,
The set reference rotation phase is a rotation phase at which the opening for gas flow is set to the fully closed opening; and the reference rotation direction is a rotation direction for operating the flow opening at a decreasing side;
The said motor control part is comprised so that it may discriminate | determine that the said setting start conditions are satisfy | filled, when the said target opening degree is the ignition opening degree of the said burner. The combustion gas amount control device described. The gas amount adjusting unit is provided corresponding to a stove burner equipped in a gas stove,
The reference rotation direction is a rotation direction for operating the flow opening degree to the decrease side,
The motor control unit is configured to execute a rice cooking operation process when a rice cooking operation command is instructed, and the target opening degree increases the opening degree during the rice cooking operation process. 3. The combustion gas amount control device according to claim 1, wherein the combustion gas amount control device is configured to determine that the setting start condition is satisfied when the setting start condition is satisfied.   The motor control unit is configured to control the operation of the stepping motor so as to change the gas flow opening to the fully closed opening when abnormality occurrence information is input. 5. The combustion gas amount control device according to any one of 4 above.   The movable plate is rotatably supported around a rotation axis along the axis of the output shaft, and is rotated by the stepping motor with the rotation direction around the rotation axis as the gas amount adjustment moving direction. The combustion gas amount control device according to any one of claims 1 to 5, which is configured to be operated.

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