JP4714253B2 - Pressure controller and pressure regulator - Google Patents

Description

  The present invention relates to a pressure controller that includes a pressure setting spring and is capable of adjusting a secondary side pressure of a fluid supply path to a set pressure, and a pressure controller that controls the set pressure of the pressure regulator, and a pressure regulator.

In the pressure regulating equipment equipped with the pressure regulator as described above, for example, the downstream side of the fluid supply path is divided into a plurality of branch paths, and each of the plurality of branch paths is connected to each consumer. Thus, a fluid such as natural gas is supplied to a plurality of consumers. Then, by adjusting the secondary side pressure downstream of the pressure regulator to a set pressure lower than the upstream primary pressure, the fluid pressure supplied to each consumer is within a certain range. ing.
Regarding the set pressure of the pressure regulator, the set pressure is adjusted to the target set pressure that is changed according to the load, instead of always being a constant pressure. For example, in the case of supplying a fluid such as natural gas to a plurality of consumers through a fluid supply path, the load becomes high during a time period when many demands such as evening are expected, and the gas supply pressure to each consumer is There is a possibility of decline. Therefore, it is required to adjust the set pressure to the high target set pressure during times when many demands are expected, such as evening, and to adjust the set pressure to the low target set pressure during other times. It has been. Therefore, in the conventional pressure regulation equipment, for example, the set pressure is adjusted to the target set pressure that changes according to the time zone (see, for example, Patent Document 1).

  In order to adjust the set pressure to the target set pressure, a pressure adjusting screw capable of adjusting the compression amount of the pressure setting spring of the pressure regulator is provided, and a motor for rotating the pressure adjusting screw is provided. The pressure controller is provided with a motor control unit that controls the operation of the motor. The motor control unit operates the motor to adjust the rotation angle of the pressure adjusting screw, and the rotation angle is the target set pressure. The set pressure is adjusted to the target set pressure by operating the motor so that the target rotation angle corresponds to (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 63-24489 JP-A-62-40510

  As described in Patent Document 2, when the set pressure is adjusted to the target set pressure, the motor is operated. However, the rotation of the pressure adjusting screw is activated when the motor is operated due to backlash of the drive shaft of the motor or gear backlash. Hysteresis will occur in the angle. When the set pressure is adjusted to the target set pressure, the set pressure deviates from the target set pressure due to this hysteresis, and the set pressure cannot be adjusted to the target set pressure.

  Therefore, in order to prevent the occurrence of a deviation of the set pressure with respect to the target set pressure due to hysteresis, it is conceivable to devise the shape of the gear or to process each component such as the drive shaft with high accuracy. However, even with such ingenuity and processing, the amount of deviation of the set pressure with respect to the target set pressure due to hysteresis can only be reduced, and the amount of deviation cannot be reduced to zero. Incurs an increase in cost.

  Also, when the motor is rotated to the side where the set pressure shift occurs with respect to the target set pressure in order to prevent the occurrence of the set pressure shift due to the hysteresis, it is more than the desired rotation amount. There is one that controls the operation of the motor so that the rotation direction immediately before the motor stops is set to a constant direction by rotating the motor and then reversing the rotation direction. However, in this case, in order to obtain the optimum rotation amount as the overshoot rotation amount that causes the motor to rotate extra, it is necessary to consider various conditions, and the optimum rotation amount can be easily and accurately determined. It was difficult to ask often. For this reason, for example, the excessive rotation amount may be excessively increased, and at this time, the set pressure is temporarily excessively adjusted with respect to the target set pressure although it is temporary.

  The present invention has been made paying attention to such a point, and its purpose is to prevent the occurrence of a deviation of the set pressure with respect to the target set pressure due to hysteresis generated during operation of the motor without incurring a cost increase. The point is to provide a pressure controller capable of adjusting the set pressure to the target set pressure.

In order to achieve this object, the characteristic configuration of the pressure controller according to the present invention includes a pressure setting spring and a pressure regulator that can adjust the secondary side pressure of the fluid supply path to the set pressure. In the pressure controller that controls
In order to adjust the set pressure to the target set pressure, a motor control unit that controls the operation of a motor that rotates a pressure adjusting screw that can adjust the compression amount of the pressure setting spring, and adjusts the set pressure to the target set pressure. when, and an information acquisition unit that the predetermined pressure by the hysteresis generated during operation of the motor to obtain a displacement amount information about the deviation amount deviates from the target set pressure, the motor control unit, said pressure regulators two When the secondary side pressure is compared with the target set pressure and the secondary side pressure is shifted by a certain amount with respect to the target set pressure only on one side in the rotation direction of the motor When it is determined, based on the shift amount information acquired by the information acquisition section, determined pressure correction amount for the set pressure and the target set pressure , In that it is configured to perform a hysteresis correction process for controlling the operation of the motor so as to correct the calculated pressure correction amount.

According to this feature configuration, since the information acquisition unit can obtain the deviation amount information regarding the deviation amount in which the set pressure deviates from the target set pressure due to the hysteresis generated during the operation of the motor, the motor control unit obtains the information. It is possible to easily and accurately grasp how much pressure is corrected from the deviation amount information obtained in the section to set the set pressure as the target set pressure. Therefore, the motor control unit can easily and accurately obtain the pressure correction amount by performing the hysteresis correction process, and the motor operation amount and the motor operation so as to correct the accurately obtained pressure correction amount. Can be controlled. Thereby, it is possible to prevent the set pressure from deviating from the target set pressure due to hysteresis.
As a result, it is possible to adjust the set pressure to the target set pressure without increasing the cost simply by adding a control operation in which the motor control unit performs hysteresis correction processing.
In a hysteresis shift state in which the set pressure is shifted with respect to the target set pressure due to hysteresis, the secondary pressure of the pressure regulator is shifted by a certain amount with respect to the target set pressure only on one side in the rotation direction of the motor. Therefore, the motor control unit can accurately determine that the state is a hysteresis shift state by comparing the secondary pressure of the pressure regulator and the target set pressure. The motor control unit does not perform the hysteresis correction process periodically, for example, once a day, but performs the hysteresis correction process when it is determined that the state is a hysteresis deviation state. The occurrence of deviation of the set pressure with respect to the target set pressure due to hysteresis can be accurately prevented.

  In a further characteristic configuration of the pressure controller according to the present invention, the information obtaining unit is capable of receiving an output signal of a secondary side pressure detecting means for detecting a secondary side pressure of the pressure regulator, and outputs the received output signal. The motor control unit is configured to obtain the deviation amount information, and the motor control unit compares the output signal of the secondary-side pressure detection unit obtained by the information acquisition unit with the target set pressure in the hysteresis correction process. Thus, the pressure correction amount is obtained.

  According to this feature configuration, the information obtaining unit automatically obtains the output signal of the secondary side pressure detection means as the deviation amount information, so that the information obtaining unit can obtain the deviation amount information easily and accurately. Can do. Then, the motor control unit compares the output signal of the secondary side pressure detection means obtained by the information obtaining unit with the target set pressure, and for example, directly corrects the difference between the secondary side pressure and the target set pressure. The pressure correction amount can be easily and accurately obtained.

  A further characteristic configuration of the pressure controller according to the present invention is such that the information obtaining unit is capable of inputting secondary side pressure information about the secondary side pressure of the pressure regulator as the deviation amount information by an artificial input operation. The motor control unit is configured to obtain the pressure correction amount by comparing the secondary pressure information obtained by the information obtaining unit and the target set pressure in the hysteresis correction process. In the point.

  According to this characteristic configuration, the information acquisition unit can acquire the deviation amount information only by enabling the secondary pressure information to be input to the information acquisition unit. Therefore, it is possible to simplify the configuration for obtaining the deviation amount information in the information obtaining unit. Similarly to the above, for example, the motor control unit can directly obtain the difference between the secondary pressure and the target set pressure as the pressure correction amount, and can easily and accurately obtain the pressure correction amount.

  A further characteristic configuration of the pressure controller according to the present invention is that the information acquisition unit includes a pressure shift that indicates a pressure shift amount in which the set pressure deviates from the target set pressure due to hysteresis during operation of the motor by an artificial input operation. The motor control unit is configured to be able to input amount information as the displacement amount information, and the motor control unit obtains a displacement amount indicated by the pressure displacement amount information obtained by the information obtaining unit as the pressure correction amount in the hysteresis correction process. It is in the point comprised as follows.

  According to this feature configuration, the information obtaining unit can obtain the amount of deviation only by preliminarily obtaining the information on the amount of pressure deviation by experiment or experience, and enabling the information on the amount of pressure deviation obtained in advance to be input to the information obtaining unit. Information can be obtained. Since the pressure deviation amount information is information indicating a deviation amount for setting the set pressure as the target set pressure, the motor control unit obtains the pressure deviation amount information obtained by the information obtaining unit as a pressure correction amount as it is. be able to. Therefore, it is possible to simplify the calculation of the pressure correction amount while simplifying the configuration for acquiring the deviation amount information in the information acquisition unit.

  A further characteristic configuration of the pressure controller according to the present invention is that the motor control unit corresponds to the pressure correction amount when the motor control unit adjusts the set pressure to the target set pressure in the hysteresis correction processing. Therefore, the correction is made to the extent that it is corrected, and the operation of the motor is controlled based on the corrected operation amount.

  According to this feature configuration, the motor operation amount when the set pressure is adjusted to the target set pressure is set, but the motor control unit corresponds to the set motor operation amount as the pressure correction amount. Correct by minutes. Thereby, the operation amount of the motor can be corrected in accordance with the magnitude of the deviation amount of the set pressure with respect to the target set pressure due to hysteresis. The motor control unit controls the motor operation amount based on the motor operation amount corrected when the set pressure is adjusted to the target set pressure. Therefore, the motor operation amount is set with respect to the target set pressure by hysteresis. The set pressure can be accurately adjusted to the target set pressure as the optimum operation amount for accurately preventing the occurrence of the pressure deviation.

  In a further characteristic configuration of the pressure controller according to the present invention, the motor control unit obtains a rotation amount for correction of the motor corresponding to the pressure correction amount in the hysteresis correction processing, and When the motor is rotated to the side where the set pressure deviation occurs, the motor is rotated in excess by the correction rotation amount, and then the rotation direction is reversed to adjust the set pressure to the target set pressure. It is configured to control the operation.

  According to this feature configuration, when the motor control unit rotates the motor to the side where the set pressure deviates from the target set pressure, the motor control unit rotates the motor more than the desired amount of rotation and then rotates the motor. The operation of the motor is controlled so as to reverse. As a result, the rotational direction immediately before the motor is stopped becomes a constant direction, and the occurrence of a deviation of the set pressure with respect to the target set pressure due to hysteresis can be prevented. The motor control unit obtains the motor correction rotation amount corresponding to the pressure correction amount, and uses the obtained correction rotation amount as the excessive rotation amount that causes the motor to rotate excessively. The quantity can be determined easily and accurately. As a result, the set pressure can be adjusted to the target set pressure while accurately preventing the set pressure from being excessively excessively adjusted with respect to the target set pressure temporarily. Furthermore, in this case, if the motor is in a stopped state, the state in which hysteresis is canceled in a constant rotation direction is always maintained, so that the motor is automatically operated and the motor is manually operated. When switching, the motor can be easily operated while grasping the state of hysteresis.

  The characteristic configuration of the pressure regulating equipment according to the present invention is that a pressure controller having any one of the above-described characteristic configurations of the pressure controller is provided, and the pressure regulator is provided in the middle of the fluid supply path.

  According to this feature configuration, as described in the feature configuration of the pressure controller described above, the set pressure can be set to the target set pressure without incurring a cost increase simply by adding a control operation in which the motor control unit performs hysteresis correction processing. It is possible to realize a pressure-regulating facility equipped with a pressure controller that can be adjusted to high.

An embodiment of pressure regulation equipment provided with a pressure controller concerning the present invention is described based on a drawing.
This pressure regulator is provided in the middle of a fluid supply path 1 for supplying fluid, and a pressure regulator 2 that adjusts the secondary side pressure to a set pressure; a pressure controller 3 that controls the set pressure of the pressure regulator 2; It has. For example, although not shown in the figure, a plurality of consumers can be obtained by branching the downstream side of the pressure regulator 2 of the fluid supply path 1 into a plurality of branch paths and connecting each of the plurality of branch paths to each consumer. It is configured to supply a fluid such as natural gas. Then, the secondary pressure on the downstream side is adjusted by the pressure regulator 2 to a set pressure lower than the primary pressure on the upstream side.

The main governor 4 as the pressure regulator 2 is provided in the fluid supply path 1, and the pilot governor 5 is branched from the upstream side of the fluid supply path 1 with respect to the main governor 4, and the fluid supply path 1 with respect to the main governor 4. It is provided in the branch joint channel 6 which joins the downstream side.
The main governor 4 is configured to open and close the valve body 8 by moving the valve body 8 with a diaphragm 7. The diaphragm 7 is urged by a spring 9 so as to move the valve body 8 to the open side. A branch junction channel 6 is connected to the pressure detection chamber 10 partitioned by the diaphragm 8. In the branch joint channel 6, a throttle 11 is provided between the branch point 6 a of the fluid supply path 1 and the branch connection point 6 b branched and connected to the pressure detection chamber 10.
Similar to the main governor 4, the pilot governor 5 is configured to open and close the pilot valve body 13 by moving the pilot valve body 13 with the pilot diaphragm 12. The pilot diaphragm 12 is urged by a pilot spring 14 so as to move the pilot valve body 13 to the open side.

When the secondary pressure of the pressure regulator 2 that is the downstream pressure of the main governor 4 is higher than the set pressure, the pressure of the pilot pressure detection chamber 15 in the pilot governor 5 is high, and the pressure of the pilot spring 14 is increased by the pressure. The pilot valve body 13 moves to the closing side against the urging force. As a result, the pressure in the pressure detection chamber 10 of the main governor 4 becomes a primary pressure on the upstream side of the main governor 4 in the fluid supply path 1, and the valve body 8 closes against the biasing force of the spring 9. Move to. As a result, the pressure regulator 2 is stopped.
Conversely, when the secondary pressure of the pressure regulator 2 is lower than the set pressure, the pilot valve body 13 moves to the open side by the biasing force of the pilot spring 14. Thereby, in the branch joint flow path 6, the flow rate of the fluid is restricted by the restriction 11, so that the fluid in the pressure detection chamber 10 flows toward the pilot governor 5. Therefore, the pressure in the pressure detection chamber 10 decreases and the valve body 8 moves to the open side by the biasing force of the spring 9. As a result, the secondary pressure of the pressure regulator 2 is increased and adjusted to the set pressure.

  The set pressure of the pressure regulator 2 is not always set to a constant pressure, but is adjusted to a target set pressure that changes according to the load. For example, in the gas supply path, the load increases during a time period when a lot of demand is expected, so the set pressure is adjusted to the target set pressure of high pressure, and the load decreases during other time periods. Is adjusted to the target set pressure of low pressure. Therefore, for example, as shown in FIG. 2, the set pressure is adjusted to the target set pressure that changes according to the time zone.

  The pilot governor 5 is provided with a pressure adjusting screw 16 for adjusting the compression amount of the pilot spring 14 and a motor 17 for rotating the pressure adjusting screw 16. The amount of compression of the pilot spring 14 is adjusted by adjusting the amount of rotation of the pressure adjusting screw 16 by the motor 17. And the secondary side pressure of the pressure regulator 2 when the pilot valve body 13 opens and closes can be changed by adjusting the compression amount of the pilot spring 14. As a result, the set pressure of the pressure regulator 2 can be changed. Thus, the pilot spring 14 corresponds to a pressure setting spring. By adjusting the amount of rotation of the pressure adjustment screw 16 by the operation of the motor 17 and adjusting the compression amount of the pilot spring 14, the pressure regulator 2 of the pressure regulator 2 is adjusted. It is configured to change the set pressure. For example, the set pressure of the pressure regulator 2 can be changed to a higher pressure as the rotation amount of the pressure adjusting screw 16 is increased.

  The pressure controller 3 includes a motor control unit 18 that controls the operation of the motor 17 and an information acquisition unit 19 that acquires various types of information. Here, the pressure controller 3 is configured by, for example, a motor controller that controls the operation of the motor 17, or a personal computer having an input unit such as a keyboard that can be connected to the motor controller and the motor controller. It can consist of a computer. Moreover, the information acquisition part 19 can be comprised by the input port and input interface for acquiring various information, for example.

  The motor control unit 18 stores actual adjustment relationship information indicating the relationship between the target setting pressure and the rotation angle of the pressure adjusting screw 16 that are used during adjustment to actually adjust the setting pressure to the target setting pressure. Then, the motor control unit 18 obtains a target rotation angle for setting the set pressure as the target set pressure based on the stored actual adjustment relation information, and the target rotation angle obtained by calculating the rotation angle of the pressure adjusting screw 16. Thus, the operation amount of the motor 17 is controlled based on the detection information of the displacement meter 20 that detects the operation amount of the motor 17. Thus, for example, as shown in FIG. 2, even if the target set pressure is changed according to the time zone, the set pressure is adjusted to the target set pressure by controlling the operation of the motor 17 by the motor control unit 18. Can do.

  Based on the flowchart of FIG. 3, setting and correction of the relationship information for actual adjustment indicating the relationship between the target set pressure and the rotation angle of the pressure adjusting screw 16 for adjusting the set pressure, which is a configuration unique to the present application, to the target set pressure. Will be described.

  In the initial stage of installation of the equipment, the motor control unit 18 performs an actual adjustment related information setting process for setting and storing the actual adjustment related information (# 1). This actual adjustment related information setting process is not limited to the initial installation of equipment, but can be executed when it is necessary to reset the actual adjustment related information, and can be executed as necessary.

  When the set pressure is adjusted to the target set pressure, the actual secondary pressure of the pressure regulator 2 may deviate from the target set pressure. Therefore, for example, every time a set period (for example, one day) elapses after the operation is actually started, the motor control unit 18 determines that the actual secondary pressure of the pressure regulator 2 is deviated from the target set pressure. The secondary pressure of the pressure regulator 2 is compared with the target set pressure, and whether the set actual adjustment relation information is shifted from the relation information suitable for actual use is an actual adjustment relation information deviation state, A shift state determination process is performed to determine whether the state is a hysteresis shift state due to hysteresis when the motor 17 is operated, or whether both are the actual adjustment related information shift state and the hysteresis shift state (# 2).

When the motor control unit 18 determines that the actual adjustment relation information is shifted in the shift state determination process, the actual adjustment relation information is set so that the actual adjustment relation information becomes relation information suitable for actual use. The actual adjustment related information correction process is performed to correct (# 3, # 4). After performing the actual adjustment relation information correction process, the motor control unit 18 controls the operation of the motor 17 to adjust the set pressure to the target set pressure based on the corrected actual adjustment relation information.
Further, when the motor control unit 18 determines that the state is a hysteresis shift state in the shift state determination process, the motor control unit 18 calculates a pressure correction amount for setting the set pressure as the target set pressure, and corrects the calculated pressure correction amount. Hysteresis correction processing for controlling the operation 17 is performed (# 5, # 6).
If the motor control unit 18 determines that both the actual adjustment related information shift state and the hysteresis shift state are in the shift state determination process, the motor control unit 18 performs both the actual adjustment related information correction process and the hysteresis correction process.

Here, the deviation state determination process is performed every time a set period (for example, one day) elapses from the start of operation, but the timing at which the deviation state determination process is performed can be changed as appropriate. . For example, when the execution of the deviation state determination process is instructed by the operator, the deviation state determination process can be performed.
The actual adjustment related information correction process is performed on the assumption that the deviation state determination process is executed, but may be sequentially performed regardless of the execution of the deviation state determination process .
Thus, the deviation state judgment processing, and, for each of the actual adjustment related information correction processing, the timing of executing can be changed as appropriate.

Hereinafter, each process will be described.
[Relation information setting processing for actual adjustment]
In the actual adjustment related information setting process, the information obtaining unit 19 determines the adjustment inclination per unit variation, which is the relationship between the variation of the target set pressure and the variation of the rotation angle of the pressure adjusting screw 16. Information for determining the inclination for adjustment and current pressure information indicating the secondary pressure of the current pressure regulator 2 are obtained.
As for the current pressure information, a secondary side pressure detection sensor 21 (corresponding to a secondary side pressure detecting means) for detecting the secondary side pressure of the pressure regulator 2 is provided in the fluid supply path 1, and the information acquisition unit 19. However, the current pressure information is obtained by receiving the output signal of the secondary pressure detection sensor 21.
For the inclination determination information for adjustment, the information acquisition unit 19 is configured to be able to input selection information (for example, model name) for selecting one model of the pressure regulator from a plurality of models of pressure regulators by an artificial input operation. The input selection information is obtained as adjustment inclination determination information.

  As shown in FIG. 4A, the motor control unit 18 stores model-specific inclinations (for example, K1 to K4) in each of a plurality of types of pressure regulators. Then, when the information acquisition unit 19 obtains the selection information (for example, model name), the motor control unit 18 selects the model-specific inclination of the model based on the selection information, and adjusts the selected model-specific inclination for adjustment. Determine as. For example, when the model name A is input to the information acquisition unit 19 when the model name A of the model name A is K1, the motor control unit 18 sets the model type inclination K1 of the pressure regulator 2 of the model name A. The inclination K for adjustment is determined.

  As shown in FIG. 4B, the motor control unit 18 causes the straight line indicated by the determined adjustment slope K to pass through the intersection P between the current secondary pressure and the current rotation angle of the pressure adjustment spring 16. Then, the actual adjustment relation information R is set by moving the straight line indicated by the determined adjustment inclination K. In this way, the motor control unit 18 determines the adjustment inclination based on the adjustment inclination determination information obtained by the information acquisition unit 19, and the determined adjustment inclination, the current acquisition obtained by the information acquisition unit 19. Based on the pressure information and the current rotation angle information indicating the current rotation angle of the pressure adjusting screw 16, the actual adjustment relation information is set.

  Another configuration can be applied to the configuration for obtaining the adjustment inclination determination information. For example, a pressure change value of the target set pressure per rotation of the pressure adjusting screw 16 can be input to the information obtaining unit 19 by an input operation by an operator using an input unit such as a keyboard. The information acquisition unit 19 can be configured to acquire the input pressure change value as adjustment inclination determination information. In this case, as shown in FIG. 4C, the motor control unit 18 directly adjusts the pressure change amount of the target set pressure per rotation of the pressure adjusting screw 16 obtained by the information obtaining unit 19 as it is for adjustment. And a straight line passing through the intersection P between the current secondary pressure and the current rotation angle of the pressure adjusting spring 16 and having the pressure change amount T of the target set pressure per rotation as an inclination is obtained. Is set as the actual adjustment related information R.

In addition, it is possible to input the spring constant of the pilot spring 14, the screw pitch of the pressure adjusting screw 16, and the effective area of the pilot diaphragm 12 to the information acquisition unit 19 by an artificial input operation by an operator using the input unit. . The information acquisition unit 19 can be configured to acquire the input spring constant, screw pitch, and effective area as adjustment inclination determination information. In this case, the motor control unit 18 obtains, for example, a pressure change amount of the target set pressure per rotation of the pressure adjusting screw 16 based on the spring constant, the screw pitch, and the effective area obtained by the information obtaining unit 19. Then, the obtained pressure change amount is determined as an adjustment slope. The motor control unit 18, as in FIG. 4 (c), the slope for the determined adjustment, the current of the secondary side pressure, and, from the current rotation angle of the pressure regulating spring 16, the actual adjustment related information R Set.

[Displacement state determination processing]
In this deviation state determination process, for example, a set period (for example, 1 day) has elapsed since the start of operation, and as shown in FIG. This is a process to be performed after it has been performed.
In the deviation state determination process, the information acquisition unit 19 acquires pressure information about the secondary side pressure of the pressure regulator 2 at each of a plurality of times (for example, every hour for one day). This pressure information can be obtained automatically or by an artificial input operation by an operator. When performing automatically, the secondary side pressure of the pressure regulator 2 can be automatically obtained by receiving the output signal of the secondary side pressure detection sensor 21 in relation to the time at that time. Further, in the case of performing an artificial input operation, for example, a pressure monitoring device that sequentially stores the output signal of the secondary side pressure sensor 21 in association with the time at that time is provided. The secondary side pressure of the pressure regulator at a plurality of times can be obtained by the operator performing input operation using the input unit.

  When the information acquisition unit 19 obtains the pressure information about the secondary side pressure of the pressure regulator 2 at each of a plurality of times, the motor control unit 18, as shown in FIG. 5, the pressure regulator 2 at each of the plurality of times. The target side pressure and the target set pressure are compared, and when the target set pressure is changed, the change amount of the target set pressure from the reference position, the actual secondary side pressure of the pressure regulator 2 and the target set pressure are changed. The relationship between the amount of deviation and the amount of deviation is confirmed. Here, the reference position can be, for example, the target set pressure at point P in FIG. For example, when the information acquisition unit 19 obtains the secondary pressure of the pressure regulator 2 for one day every hour, the amount of change from the reference position of the target set pressure every hour and the secondary pressure at that time By plotting the amount of deviation between the side pressure and the target set pressure, as shown in FIG. 5, the amount of change from the reference position of the target set pressure in the day, and the amount of deviation between the secondary pressure and the target set pressure. It is possible to show what kind of tendency the relationship with.

  As shown in FIG. 6, the actual adjustment relation information deviation state in which the actual adjustment relation information R set with respect to the straight line R1 having a certain inclination obtained from the secondary pressure of the actual pressure regulator 2 is deviated. In this case, for example, when the target set pressure is changed from M1, if the amount of change in the target set pressure is increased, the amount of deviation between the actual secondary pressure of the pressure regulator 2 and the target set pressure will increase. In addition, when the change amount of the target set pressure is reduced, the deviation amount between the actual secondary pressure of the pressure regulator 2 and the target set pressure is also reduced. Therefore, in the actual adjustment related information deviation state, the magnitude of the deviation amount between the actual secondary pressure of the pressure regulator 2 and the target setting pressure also changes according to the magnitude of the change amount of the target setting pressure. . Therefore, as shown by the solid line or the alternate long and short dash line in FIG. 5, the motor control unit 18 determines the amount of deviation between the actual secondary pressure of the pressure regulator 2 and the target set pressure in accordance with the amount of change in the target set pressure. If the magnitude of the change has been changed, it is determined that the actual adjustment related information is shifted. That is, the motor control unit 18 determines that there is an error in the slope K of the actual adjustment relation information R.

  When there is a hysteresis shift state due to hysteresis that occurs during operation of the motor 17 due to backlash of the drive shaft of the motor 17 or backlash of the gear, the actual secondary side pressure of the pressure regulator 2 and only one side in the rotational direction of the motor 17 Deviation occurs between the target set pressure and the deviation amount is constant. Therefore, as shown by the dotted line in FIG. 5, the motor control unit 18 detects that the deviation between the actual secondary pressure of the pressure regulator 2 and the target set pressure is one side in the rotation direction of the motor 17 (in the illustrated example, the negative side). If the deviation amount is constant, it is determined that the hysteresis deviation state is present.

  Further, as indicated by the one-dot chain line in FIG. 5, the motor control unit 18 changes the magnitude of the deviation amount according to the magnitude of the change amount of the target set pressure, and the motor 17 rotates in one direction in the rotation direction of the motor 17. If a certain amount of deviation occurs only on the side, it is determined that both the actual adjustment related information deviation state and the hysteresis deviation state are present.

[Related information correction processing for actual adjustment]
In the actual adjustment related information correction process, the information obtaining unit 19 obtains the actual change amount of the secondary pressure of the pressure regulator 2 when the target set pressure is changed. The actual change amount of the secondary pressure of the pressure regulator 2 can be obtained automatically or by an artificial input operation, as in the case of obtaining pressure information in the above-described deviation state determination process.
When the information obtaining unit 19 obtains the actual change amount of the secondary pressure of the pressure regulator 2 when the target set pressure is changed, the motor control unit 18 corresponds to the change amount when the target set pressure is changed. The actual adjustment relation information is corrected based on the target change amount obtained from the actual adjustment relation information and the actual change amount of the secondary pressure of the pressure regulator 2 obtained by the information acquisition unit 19.

The case where the target set pressure is changed from M1 to M2 in the actual adjustment related information shift state as shown in FIG. 6 will be described as an example.
The target change amount obtained from the actual adjustment relation information R corresponding to the change amount when the target set pressure is changed from M1 to M2 is ΔP1, and the actual change amount of the secondary pressure of the pressure regulator 2 is ΔP2. . The motor control unit 18 corrects the inclination K of the actual adjustment relation information R to the inclination H based on the target change amount ΔP1 and the actual change amount ΔP2 using the following [Equation 1]. The adjustment related information R is corrected to a straight line R1.

[Equation 1]
H = K × (ΔP2 / ΔP1)
Here, H is the amount of change in the target set pressure per rotation of the pressure adjustment screw 16 after correction, and K is the target per rotation of the pressure adjustment screw 16 in the actual adjustment relation information R before correction. ΔP1 is the target change amount obtained from the actual adjustment relation information R corresponding to the change amount when the target set pressure is changed, and ΔP2 is the secondary side of the pressure regulator 2 This is the actual change in pressure.

[Hysteresis correction processing]
In this hysteresis correction process, the information acquisition unit 19 acquires shift amount information relating to the shift amount when the set pressure deviates from the target set pressure due to hysteresis in the operation of the motor 17. The information acquisition unit 19 can receive the output signal of the secondary pressure detection sensor 21 and is configured to acquire the received output signal as deviation amount information.

  As shown in FIG. 7, in the hysteresis deviation state, the actual secondary pressure (dotted line in the figure) based on the output signal of the secondary side pressure detection sensor 21 is equal to the target set pressure (solid line in the figure). Only one side in the rotational direction is displaced by a certain amount. Therefore, the motor control unit 18 compares the actual secondary pressure obtained by the information obtaining unit 19 with the target set pressure to determine a pressure correction amount for setting the set pressure as the target set pressure, and the determination is performed. The operation of the motor 17 is controlled so as to correct the pressure correction amount.

  Then, as a configuration for controlling the operation of the motor 17 so as to correct the pressure correction amount, the motor control unit 18 determines that the operation amount of the motor 17 when the set pressure is adjusted to the target set pressure is equivalent to the pressure correction amount. The operation of the motor 17 is controlled based on the corrected operation amount. For example, in the case shown in FIG. 7, since the actual secondary pressure is shifted to a lower side with respect to the target set pressure, as shown in FIG. In order to correct the operating amount of the motor 17 so as to rotate, the actual adjustment relation information R is a straight line R2 corrected to increase the rotation angle of the pressure adjusting screw 16 by an amount corresponding to the pressure correction amount.

  Here, in the hysteresis deviation state, deviation occurs only on one side in the rotation direction of the motor 17. Accordingly, the motor control unit 18 adjusts the set pressure to the target set pressure by rotating the motor 17 to the side where the deviation occurs as in the case where the set pressure is changed to the higher side and adjusted to the target set pressure in FIG. When this is done, the operation of the motor 17 is controlled by the corrected operation amount of the motor 17 (see R2 in FIG. 8). Conversely, the motor control unit 18 rotates the motor 17 in the direction opposite to the side where the deviation occurs, as in the case where the set pressure is changed to the lower side and adjusted to the target set pressure in FIG. When adjusting to the target set pressure, the operation of the motor 17 is controlled by the operation amount of the motor 17 before correction (see R in FIG. 8).

  Another configuration can be applied to the configuration for obtaining the shift amount information regarding the shift amount when the set pressure deviates from the target set pressure due to hysteresis in the operation of the motor 17. For example, the secondary pressure information on the secondary pressure of the pressure regulator 2 can be input to the information acquisition unit 19 by an artificial input operation by an operator, and the information acquisition unit 19 inputs the input secondary pressure. The information can be obtained as deviation amount information. In this case, the motor control unit 18 compares the actual secondary pressure obtained by the information obtaining unit 19 with the target set pressure and sets the set pressure as the target set pressure, as described above. The correction amount is obtained, and the operation of the motor 17 is controlled so as to correct the obtained pressure correction amount.

  Further, pressure deviation amount information indicating a pressure deviation amount at which the set pressure deviates from the target set pressure due to hysteresis in the operation of the motor 17 can be input to the information obtaining unit 19 by an artificial input operation by an operator, and the information obtaining unit 19 The input pressure deviation information can be obtained as deviation information. Here, with respect to the pressure deviation amount information, for example, how much deviation amount occurs when the set pressure is adjusted to the target set pressure due to hysteresis when the motor 17 is operated due to backlash of the drive shaft, gear backlash, or the like. It is possible to obtain this in advance by experiment, experience, etc., and input the obtained deviation amount as pressure deviation amount information. In this case, the motor control unit 18 obtains the deviation amount indicated by the pressure deviation amount information obtained by the information obtaining unit 19 as it is as the pressure correction amount.

  Another configuration can be applied to the configuration for controlling the operation of the motor 17 to correct the pressure correction amount. For example, the motor control unit 18 obtains the correction rotation amount of the motor 17 corresponding to the pressure correction amount, and when rotating the motor 17 to the side where the set pressure deviates from the target set pressure, only the correction rotation amount is obtained. It can be configured to control the operation of the motor 17 so as to adjust the set pressure to the target set pressure by reversing the rotation direction after the extra rotation.

The motor control unit 18 rotates the motor 17 to the side where the set pressure shifts with respect to the target set pressure as in the example shown in FIG. When the set pressure is adjusted to the target set pressure, the motor 17 is rotated by a correction rotation amount that is more than the target rotation angle obtained from the actual adjustment relation information R, and then the rotation direction is reversed to perform correction. The set pressure is adjusted to the target set pressure by rotating the motor 17 so as to return only the rotation amount so that the rotation angle of the pressure adjusting screw 16 becomes the target rotation angle.
On the contrary, the motor control unit 18 is the side where the set pressure shifts with respect to the target set pressure as in the example shown in FIG. 7 when the set pressure is changed to the low side to adjust to the target set pressure. When the set pressure is adjusted to the target set pressure by rotating the motor 17 in the reverse direction, the operation of the motor 17 is performed so that the rotation angle of the pressure adjusting screw 16 becomes the target rotation angle obtained from the actual adjustment relation information R from the beginning. To control.

[Another embodiment]
(1) In the above embodiment, as a configuration of the pressure regulator 2, the pilot governor 4 is opened and closed based on the secondary pressure of the pressure regulator 2 to change the pressure in the pressure detection chamber 10 of the main governor 4. However, for example, without providing the pilot governor 5, the secondary pressure of the pressure regulator 2 is directly applied to the pressure chamber of the main governor 4 to adjust the secondary pressure of the pressure regulator 2 to the set pressure. You can also. Even when the pilot governor 5 is provided, what pressure is applied to the pilot governor 5 can be appropriately changed. Therefore, the configuration of the pressure regulator 2 can be changed as appropriate, and is not limited to the example shown in the above embodiment.

  The present invention relates to a pressure regulator that includes a pressure setting spring and is capable of adjusting a secondary pressure of a fluid supply path to a set pressure, and in a pressure controller that controls the set pressure of the pressure regulator, without increasing the cost. There are various pressure controllers that can adjust the set pressure to the target set pressure by preventing the occurrence of deviation of the set pressure with respect to the target set pressure due to the hysteresis that occurs during operation, and the pressure controller and pressure regulator It can be applied to any pressure regulating equipment.

Diagram showing schematic configuration of pressure regulating equipment The figure which shows the change of the target setting pressure in each time zone Flow chart showing setting and correction of actual adjustment related information The figure which shows the relationship between the rotation angle of the pressure adjustment spring and the target set pressure Diagram showing the relationship between the amount of change in the target set pressure and the amount of deviation between the actual secondary pressure of the pressure regulator and the target set pressure The figure which shows the relationship between the rotation angle of the pressure adjustment spring and the target set pressure The figure which shows the change with the passage of time of the target set pressure and the secondary side pressure of the pressure regulator The figure which shows the relationship between the rotation angle of the pressure adjustment spring and the target set pressure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid supply path 2 Pressure regulator 3 Pressure controller 14 Pressure setting spring (Spring for pilot)
18 Motor control unit 19 Information acquisition unit 21 Secondary pressure detection means (secondary pressure detection sensor)

Claims (7)

A pressure controller for controlling a set pressure of the pressure regulator with respect to a pressure regulator having a pressure setting spring and capable of adjusting the secondary side pressure of the fluid supply path to the set pressure,
A motor control unit that controls the operation of a motor that rotates a pressure adjustment screw that can adjust the compression amount of the pressure setting spring to adjust the set pressure to a target set pressure;
An information obtaining unit that obtains deviation amount information relating to a deviation amount in which the set pressure deviates from the target set pressure due to hysteresis generated when the motor is operated when the set pressure is adjusted to the target set pressure;
The motor control unit compares the secondary side pressure of the pressure regulator and the target set pressure, and the secondary side pressure deviates from the target set pressure by a certain amount only on one side in the rotation direction of the motor. If it is determined that the state is a hysteresis deviation state due to the hysteresis, a pressure correction amount for setting the set pressure as the target set pressure is obtained based on the deviation amount information obtained by the information obtaining unit, A pressure controller configured to perform a hysteresis correction process for controlling the operation of the motor so as to correct the pressure correction amount. The information obtaining unit is configured to receive an output signal of a secondary side pressure detecting means for detecting a secondary side pressure of the pressure regulator, and to obtain the received output signal as the deviation amount information,
The motor control unit is configured to determine the pressure correction amount by comparing an output signal of the secondary pressure detection unit obtained by the information acquisition unit and the target set pressure in the hysteresis correction process. The pressure controller according to claim 1. The information obtaining unit is configured to be able to input secondary side pressure information about the secondary side pressure of the pressure regulator as the deviation amount information by an artificial input operation,
The said motor control part is comprised so that the said pressure correction amount may be calculated | required by comparing the said secondary side pressure information acquired in the said information acquisition part, and the said target setting pressure in the said hysteresis correction process. The pressure controller according to 1. The information acquisition unit is configured to be able to input pressure deviation amount information indicating the amount of pressure deviation from which the set pressure deviates from the target set pressure due to hysteresis during operation of the motor by an artificial input operation as the deviation amount information. ,
The pressure controller according to claim 1, wherein the motor control unit is configured to obtain, as the pressure correction amount, a deviation amount indicated by the pressure deviation amount information obtained by the information obtaining unit in the hysteresis correction process. .   In the hysteresis correction process, the motor control unit corrects the operation amount of the motor when adjusting the set pressure to the target set pressure by an amount corresponding to the pressure correction amount, and based on the corrected operation amount The pressure controller according to claim 1, wherein the pressure controller is configured to control operation of the motor.   In the hysteresis correction process, the motor control unit obtains a correction rotation amount of the motor corresponding to the pressure correction amount, and rotates the motor to a side where the set pressure shifts with respect to the target set pressure. In this case, the motor is controlled so as to adjust the set pressure to the target set pressure by reversing the rotation direction after rotating the correction rotation amount excessively. The pressure controller according to any one of 1 to 4. A pressure regulator comprising the pressure controller according to claim 1, wherein the pressure regulator is provided in the middle of the fluid supply path.

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