Redundancy control system and method of pneumatic valve

Abstract

The invention discloses a redundancy control system and method for a pneumatic valve. The system comprises an air source, a main control assembly, a standby control assembly, a main controller, a switching valve and a switching controller. One path of the air source is connected with the switching valve through the main control assembly, the other path of the air source is connected with the switching valve through the standby control assembly, and the switching valve is connected with the pneumatic valve. The main controller is in communication connection with the main control assembly and the standby control assembly and used for sending the same control signals to the main control assembly and the standby control assembly and controlling the main control assembly and the standby control assembly to output the same airflow to the switching valve. The switching controller is in communication connection with the main control assembly, the standby control assembly and the switching valve and used for judging and controlling the switching valve according to the states, read in real time, of the main control assembly and the standby control assembly, and the pneumatic valve is switched to be communicated with the main control assembly or the standby control assembly. According to the invention, under the condition that any part of the main control assembly breaks down, the standby control assembly can be adopted to reliably control the valve.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic valves, and in particular to a redundant control system and method for pneumatic valves. Background Art

[0002] In the existing pneumatic valve control system, any component plays a vital role in the entire control process. Failure of any component will cause abnormal pneumatic valve control and have a significant impact on the unit system. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address at least one defect in the related technology mentioned in the above background technology: in the control system of the existing pneumatic valve, any component failure will cause abnormal control of the pneumatic valve, which will have a significant impact on the unit system. A redundant control system and method for pneumatic valves are provided.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a redundant control system for pneumatic valves, including an air source, a main control component, a backup control component, a main controller, a switching valve and a switching controller;

[0005] One path of the gas source is connected to the switching valve via the main control component, and another path of the gas source is connected to the switching valve via the backup control component, and the switching valve is connected to the pneumatic valve;

[0006] The main controller is respectively connected to the main control component and the backup control component for communication, and the main controller is used to send the same control signal to the main control component and the backup control component respectively, so as to control the main control component and the backup control component to output the same airflow to the switching valve;

[0007] The switching controller is communicatively connected with the main control component, the backup control component and the switching valve. The switching controller is used to judge and control the switching valve according to the status of the main control component and the backup control component read in real time, and switch the pneumatic valve to be connected with the main control component or the backup control component.

[0008] In some embodiments, the main controller is further connected to the switching controller for communicating with the switching controller. The switching controller is configured to read in real time whether the main control component and / or the backup control component fails and feed back an alarm signal to the main controller.

[0009] In some embodiments, the switching controller is also used to initially control the switching valve, switching to the pneumatic valve being connected to the main control component; and, further used to record and display the switching judgment process, and feed back the switching judgment process to the main controller. The switching judgment process is the process in which the switching controller judges and controls the switching valve when reading the status of the main control component and the backup control component in real time, switching to the pneumatic valve being connected to the backup control component.

[0010] In some embodiments, a manual switch is provided on the switching controller, and the manual switch is used to fixedly select the main control component for air pressure output.

[0011] In some embodiments, the primary control assembly includes a first positioner, and the backup control assembly includes a second positioner;

[0012] The switching controller is communicatively connected to the first positioner and the second positioner respectively, and is used to judge and control the switching valve according to the states of the first positioner and the second positioner read in real time.

[0013] In some embodiments, the primary control assembly further includes a first flow amplifier, and the backup control assembly further includes a second flow amplifier;

[0014] The main controller is communicatively connected to the first locator and the second locator respectively;

[0015] The first positioner is used to adapt the control signal of the main controller to output a pneumatic signal to the first flow amplifier, and the first flow amplifier is used to amplify the output flow according to the pneumatic signal;

[0016] The second positioner is used to adapt the control signal of the main controller to output a pneumatic signal to the second flow amplifier, and the second flow amplifier is used to amplify the output flow according to the pneumatic signal.

[0017] In some embodiments, the redundant control system of the pneumatic valve further includes a first valve position feedback device and a second valve position feedback device provided on the pneumatic valve;

[0018] The first valve position feedback device is in communication with the first positioner, and is used to feed back a current valve position signal to the main controller via the first positioner, and the main controller is used to compare the current valve position signal with a target valve position signal to adjust the output of the control signal;

[0019] The second valve position feedback is communicatively connected to the second positioner. The second valve position feedback is used to feed back a current valve position signal to the main controller via the second positioner. The main controller is used to compare the current valve position signal with the target valve position signal to adjust the output of the control signal.

[0020] In some embodiments, the status of the main control component and the backup control component includes at least one of the internal data of the first positioner and the second positioner, the pneumatic signals output by the first positioner and the second positioner, the read instruction signals received by the first positioner and the second positioner, and the current valve position signals received by the first positioner and the second positioner.

[0021] In some embodiments, the main controller is provided with two output cards, one of which is communicatively connected to the main control component and is used to output a control signal to the main control component; the other of which is communicatively connected to the backup control component and is used to output the same control signal to the backup control component.

[0022] The present invention also constructs a redundant control method for a pneumatic valve, which is applied to any of the redundant control systems of the pneumatic valves described above, and comprises the following steps:

[0023] The main controller sends the same control signal to the main control component and the backup control component respectively, and the main control component and the backup control component output the same airflow to the switching valve;

[0024] The switching controller controls the switching valve to switch the pneumatic valve to be connected to the main control component;

[0025] The switching controller reads the status of the active control component and the standby control component;

[0026] The switching controller determines the fault conditions of the active control component and the standby control component according to the read states of the active control component and the standby control component;

[0027] If the main control component fails and the backup control component is normal, the switching controller controls the switching valve to switch the pneumatic valve to communicate with the backup control component.

[0028] By implementing the present invention, the following beneficial effects are achieved:

[0029] The redundant control system of the pneumatic valve of the present invention is used for controlling the pneumatic valve. From the output of the control signal to the airflow input of the final pneumatic valve, a dual independent redundant design is adopted. In this way, in the event of a failure of any component of the main control component, the backup control component can be used to reliably control the pneumatic valve. Moreover, since the main control component and the backup control component output the same airflow to the switching valve, the stability of the air pressure and the stability of the pneumatic valve control during the switching process can be guaranteed, thereby ensuring the safe and stable operation of the pneumatic valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0031] Figure 1 FIG1 shows a logical structure diagram of an embodiment of a redundant control system for a pneumatic valve according to the present invention;

[0032] Figure 2 A flow chart of an embodiment of a redundant control method for a pneumatic valve according to the present invention is shown. DETAILED DESCRIPTION

[0033] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0035] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "located at," and "located at" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or chemical connections, and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] It should be noted here that the connection between the following components refers to the physical structure connection, and does not uniquely limit the connectivity relationship therein, while the communication connection refers to a wired electrical connection (such as a cable) or a wireless connection with signal transmission.

[0038] like Figure 1 As shown, some embodiments of the present invention disclose a redundant control system for a pneumatic valve, including an air source 1, a primary control component 2, a backup control component 3, a main controller 4, a switching valve 5, and a switching controller 6, as follows:

[0039] One path of the gas source 1 is connected to the switching valve 5 via the main control component 2 , and the other path of the gas source 1 is connected to the switching valve 5 via the backup control component 3 , and the switching valve 5 is connected to the pneumatic valve 11 .

[0040] The main controller 4 is respectively connected to the main control component 2 and the backup control component 3 for communication. The main controller 4 is used to send the same control signal to the main control component 2 and the backup control component 3 respectively, and is used to control the main control component 2 and the backup control component 3 to output the same airflow to the switching valve 5.

[0041] The switching controller 6 is communicatively connected with the main control component 2, the backup control component 3 and the switching valve 5. The switching controller 6 is used to judge and control the switching valve 5 according to the status of the main control component 2 and the backup control component 3 read in real time, and switch to the pneumatic valve 11 to be connected with the main control component 2 or the backup control component 3.

[0042] The redundant control system of the pneumatic valve of this embodiment is used to control the pneumatic valve 11. From the output of the control signal to the final airflow input of the pneumatic valve 11, a dual independent redundant design is adopted. In this way, in the event of a failure of any component of the main control component 2, the backup control component 3 can be used to reliably control the pneumatic valve 11. Moreover, since the main control component 2 and the backup control component 3 output the same airflow to the switching valve 5, the stability of the air pressure and the stability of the control of the pneumatic valve 11 during the switching process can be guaranteed, thereby ensuring the safe and stable operation of the pneumatic valve 11.

[0043] The redundant control system of the pneumatic valve is provided with a special switching controller 6, which ultimately outputs a switching signal to the switching valve 5. Under normal operating conditions of other components, even if the switching controller 6 fails, the main controller 4 can independently control the starting valve regardless of which side the switching valve 5 selects. Therefore, the failure of the switching controller 6 will not affect the control of the pneumatic valve 11, but will only affect the redundant switching function of the starting valve.

[0044] In some embodiments, the switching valve 5 is a three-way valve. The three-way valve here is only an example and is not intended to limit the present application. Other valves are also possible.

[0045] In some embodiments, the main controller 4 is provided with two output cards, one of which is communicatively connected to the primary control component 2 for outputting a control signal to the primary control component 2, and the other of which is communicatively connected to the backup control component 3 for outputting the same control signal to the backup control component 3. For example, the main controller 4 is a DCS controller (i.e., a distributed control system controller). The DCS controller herein is merely an example and is not intended to be the sole limitation of this application; other controllers are also possible.

[0046] The control signal for controlling the opening of the pneumatic valve 11 is obtained through calculation inside the DCS controller. The control signal is output by two output cards, and the two control signals remain completely consistent. Under this redundant output mode, even if one output card fails, it can ensure that the other output card has a control signal to output without affecting the control, thereby ensuring the reliability and redundancy of the output control signal.

[0047] In some embodiments, such as Figure 1 As shown, the main controller 4 is also connected to the switching controller 6 for communication. The switching controller 6 is used to read in real time when the main control component 2 and / or the backup control component 3 fails, and feed back an alarm signal to the main controller 4. The crew can promptly check and process the main control component 2 and / or the backup control component 3 according to the relevant alarm signal.

[0048] In some embodiments, such as Figure 1 As shown, the switching controller 6 is also used to feed back an alarm signal to the main controller 4 when it is abnormal. The crew can promptly check and process the switching controller 6 according to the relevant alarm signal, and repair and replace the switching controller 6 to ensure the redundant switching control function of the switching controller 6.

[0049] In some embodiments, the switching controller 6 is further configured to initially control the switching valve 5 to switch the pneumatic valve 11 to communication with the primary control assembly 2; and further configured to record and display the switching determination process, which is the process by which the switching controller 6 determines and controls the switching valve 5 to switch the pneumatic valve 11 to communication with the backup control assembly 3 while reading the status of the primary control assembly 2 and the backup control assembly 3 in real time. It is understood that when the switching controller 6 determines that the primary control assembly 2 is normal, it may further control the switching valve 5 to switch the pneumatic valve 11 to communication with the primary control assembly 2.

[0050] In some embodiments, a manual switch is provided on the switching controller 6, which is used to fix the selection of the main control component 2 for air pressure output without switching control, thereby ensuring the stability of the switching valve 5 during the maintenance process and preventing switching action.

[0051] In some embodiments, such as Figure 1 As shown, the active control assembly 2 includes a first positioner 21, and the standby control assembly 3 includes a second positioner 31. The switching controller 6 is in communication with the first positioner 21 and the second positioner 31, respectively. The switching controller 6 is used to determine and control the switching valve 5 based on the real-time reading of the status of the first positioner 21 and the second positioner 31.

[0052] In some embodiments, such as Figure 1 As shown, the main control assembly 2 also includes a first flow amplifier 22 (a flow amplifier is also called a pneumatic amplifier), and the backup control assembly 3 also includes a second flow amplifier 32. The main controller 4 is communicatively connected to the first positioner 21 and the second positioner 31. The first positioner 21 is used to adapt the control signal of the main controller 4 to output a pneumatic signal to the first flow amplifier 22, and the first flow amplifier 22 is used to amplify the output flow rate according to the pneumatic signal. The second positioner 31 is used to adapt the control signal of the main controller 4 to output a pneumatic signal to the second flow amplifier 32, and the second flow amplifier 32 is used to amplify the output flow rate according to the pneumatic signal.

[0053] Among them, the output of the control signal is proportional to the opening of the pneumatic valve 11, and the opening of 0-100% corresponds to the control signal of 4-20mA. After the two control signals are output, they are sent to the positioner for control. The positioner receives the 4-20mA control signal and converts it into a corresponding pneumatic signal. The output of the pneumatic signal is proportional to the control signal. The positioner outputs the pneumatic signal to the flow amplifier. The flow amplifier can amplify the output flow according to the pneumatic signal, making the control of the pneumatic valve 11 faster.

[0054] like Figure 1As shown, the airflow output by the first flow amplifier 22 and the second flow amplifier 32 is sent to the switching valve 5, and the switching valve 5 receives the airflow input from two routes. Under normal working conditions, the switching valve 5 selects one route to be connected to the pneumatic valve 11, and quickly switches to the other route to be connected to the pneumatic valve 11 when excitation is performed or one route fails. Since the control signals and equipment models used by the upper and lower signals are consistent, it can be ensured that the pressure entering the pneumatic valve 11 remains stable before and after the two routes are switched, and no large opening fluctuations are caused to the valve.

[0055] In some embodiments, such as Figure 1 As shown, the redundant control system for the pneumatic valve further includes a first valve position feedback device 7 and a second valve position feedback device 8 provided on the pneumatic valve 11. The first valve position feedback device 7 is communicatively connected to the first positioner 21. The first valve position feedback device 7 is configured to provide feedback of the current valve position signal to the main controller 4 via the first positioner 21. The main controller 4 is configured to compare the current valve position signal with the target valve position signal to adjust the output of the control signal. The second valve position feedback device is communicatively connected to the second positioner 31. The second valve position feedback device 8 is configured to provide feedback of the current valve position signal to the main controller 4 via the second positioner 31. The main controller 4 is configured to compare the current valve position signal with the target valve position signal to adjust the output of the control signal.

[0056] Specifically, the airflow output by the flow amplifier passes through the switching valve 5 and is sent to the pneumatic valve 11. The airflow acts on the valve diaphragm or cylinder, driving the valve stem to move, and the valve opens or closes. As the valve opening changes, the valve stem drives the first valve position feedback device 7 and the second valve position feedback device 8 on the valve stem to operate, which detects the valve stroke position. Through the stroke detection, it is sent to the main controller 4 via the first positioner 21 or the second positioner 31 to form a closed-loop control, which can control the valve to quickly reach the specified valve position.

[0057] In some embodiments, the status of the main control component 2 and the backup control component 3 includes at least one of the internal data of the first positioner 21 and the second positioner 31, the pneumatic signals output by the first positioner 21 and the second positioner 31, the read instruction signals received by the first positioner 21 and the second positioner 31, and the current valve position signals received by the first positioner 21 and the second positioner 31. It can be understood that the at least one can be one, two, three or four.

[0058] In some embodiments, one path of the gas source 1 is respectively connected to the gas source input end of the first positioner 21 and the gas source input end of the first flow amplifier 22, the air pressure output end of the first positioner 21 is connected to the air pressure input end of the first flow amplifier 22, and the air pressure output end of the first flow amplifier 22 is connected to the first air pressure input end of the switching valve 5.

[0059] Another path of the air source 1 is connected to the air source input of the second positioner 31 and the air source input of the second flow amplifier 32. The air pressure output of the second positioner 31 is connected to the air pressure input of the second flow amplifier 32, and the air pressure output of the second flow amplifier 32 is connected to the second air pressure input of the switching valve 5. The air pressure output of the switching valve 5 is connected to the pneumatic valve 11.

[0060] In some embodiments, such as Figure 1 As shown, the main control component 2 also includes a first filter pressure reducing valve 23 and a second filter pressure reducing valve 24, and the backup control component 3 also includes a third filter pressure reducing valve 33 and a fourth filter pressure reducing valve 34. The first filter pressure reducing valve 23, the second filter pressure reducing valve 24, the third filter pressure reducing valve 33 and the fourth filter pressure reducing valve 34 are respectively used to filter the air and reduce the air pressure.

[0061] The air source 1 is connected to the air source input of the first positioner 21 through the first filter-pressure reducing valve 23, and to the air source input of the first flow amplifier 22 through the second filter-pressure reducing valve 24. The air source 1 is connected to the air source input of the second positioner 31 through the third filter-pressure reducing valve 33, and to the air source input of the second flow amplifier 32 through the fourth filter-pressure reducing valve 34.

[0062] In some embodiments, such as Figure 1 As shown, the redundant control system for pneumatic valves also includes a first isolation valve 9 and a second isolation valve 10. One path of the air source 1 is connected to the primary control assembly 2 via the first isolation valve 9, while another path of the air source 1 is connected to the backup control assembly 3 via the second isolation valve 10. Specifically, one path of the air source 1 is connected to the first filter-pressure reducing valve 23 and the second filter-pressure reducing valve 24 after passing through the first isolation valve 9, while another path of the air source 1 is connected to the third filter-pressure reducing valve 33 and the fourth filter-pressure reducing valve 34 after passing through the second isolation valve 10.

[0063] In order to eliminate the failure of the main control component 2 and / or the backup control component 3 in time, an isolation valve is provided to isolate the equipment for removal and replacement.

[0064] In summary, compressed air from air source 1 flows through first isolation valve 9 to supply primary control assembly 2, while another flow path flows through second isolation valve 10 to supply backup control assembly 3. The airflow entering primary control assembly 2 is split into two paths: one path flows through first filter-pressure reducing valve 23 to supply first flow amplifier 22, and the other path flows through second filter-pressure reducing valve 24 to supply first positioner 21. The first positioner 21 receives the control signal output by the main controller 4 and converts it into a corresponding pneumatic signal. The first positioner 21 outputs the pneumatic signal to the first flow amplifier 22. The output flow of the first flow amplifier 22 is adjusted by adjusting the control air pressure. The first flow amplifier 22 amplifies the flow and outputs the air pressure to the diaphragm or cylinder of the pneumatic valve 11. Under the action of the air pressure, the cylinder drives the valve stem of the pneumatic valve 11 to move. As the valve opening changes, the valve stem drives the first valve position feedback device 7 on the valve stem to operate. The first valve position feedback device 7 measures the valve position. The first valve position feedback device 7 feeds back the current valve position signal to the main controller 4 through the first positioner 21. The main controller 4 compares the current valve position signal with the target valve position signal. If the current valve position signal is consistent with the target valve position signal, the first positioner 21 maintains the current pneumatic signal. If the current valve position signal is inconsistent with the target valve position signal, the main controller 4 adjusts the output of the control signal to adjust the pneumatic signal of the first positioner 21.

[0065] Similarly, the airflow entering the backup control component 3 is divided into two paths, one path passes through the third filter pressure reducing valve 33 to supply air to the second positioner 31 , and the other path passes through the fourth filter pressure reducing valve 34 to supply air to the second flow amplifier 32 . The second positioner 31 receives the control signal output by the main controller 4 and converts it into a corresponding pneumatic signal. The second positioner 31 outputs the pneumatic signal to the second flow amplifier 32. The output flow of the second flow amplifier 32 is adjusted by adjusting the control air pressure. The second flow amplifier 32 amplifies the flow and outputs the air pressure to the diaphragm or cylinder of the pneumatic valve 11. Under the action of the air pressure, the cylinder drives the valve stem of the pneumatic valve 11 to move. As the valve opening changes, the valve stem drives the second valve position feedback device 8 on the valve stem to operate. The second valve position feedback device 8 measures the valve position. The second valve position feedback device 8 feeds back the current valve position signal to the main controller 4 through the second positioner 31. The main controller 4 compares the current valve position signal with the target valve position signal. If the current valve position signal is consistent with the target valve position signal, the second positioner 31 maintains the current pneumatic signal. If the current valve position signal is inconsistent with the target valve position signal, the main controller 4 adjusts the output of the control signal to adjust the pneumatic signal of the second positioner 31.

[0066] like Figure 2 As shown, some embodiments of the present invention disclose a redundant control method for a pneumatic valve, which is applied to the redundant control system of the pneumatic valve described in any of the above embodiments, and includes the following steps:

[0067] The main controller 4 sends the same control signal to the main control component 2 and the backup control component 3 respectively, and the main control component 2 and the backup control component 3 output the same airflow to the switching valve 5;

[0068] The switching controller 6 controls the switching valve 5 to switch the pneumatic valve 11 to communicate with the main control component 2;

[0069] The switching controller 6 reads the status of the active control component 2 and the standby control component 3;

[0070] The switching controller 6 determines the fault conditions of the active control component 2 and the standby control component 3 according to the read states of the active control component 2 and the standby control component 3;

[0071] If the main control component 2 fails and the backup control component 3 is normal, the switching controller 6 controls the switching valve 5 to switch the pneumatic valve 11 to communicate with the backup control component 3.

[0072] In some embodiments, the method further comprises:

[0073] If both the main control component 2 and the backup control component 3 fail, or the backup control component 3 fails, the switching controller 6 does not control the switching valve 5 to perform the switching action.

[0074] In some embodiments, the method further comprises:

[0075] If the active control component 2 fails and / or the standby control component 3 fails, the switching controller 6 feeds back an alarm signal to the main controller 4 .

[0076] In some embodiments, the switching controller 6 controls the switching valve 5 to switch the pneumatic valve 11 to communicate with the backup control component 3, and then further includes:

[0077] The switching controller 6 records and displays the switching judgment process, and feeds back the switching judgment process to the main controller 4. The switching judgment process is the process in which the switching controller 6 judges and controls the switching valve 5 when reading the status of the main control component 2 and the backup control component 3 in real time, and switches to the pneumatic valve 11 to be connected to the backup control component 3.

[0078] In some embodiments, the main controller 4 sends the same control signal to the main control component 2 and the backup control component 3, respectively, and the main control component 2 and the backup control component 3 output the same airflow to the switching valve 5, including:

[0079] The main controller 4 sends the same control signal to the first positioner 21 and the second positioner 31 respectively. The first positioner 21 and the second positioner 31 respectively adapt to the control signal of the main controller 4 to output pneumatic signals to the first flow amplifier 22 and the second flow amplifier 32. The first flow amplifier 22 and the second flow amplifier 32 respectively amplify the output flow according to the pneumatic signal to output the same airflow to the switching valve 5. The same airflow refers to the same air pressure and flow.

[0080] In some embodiments, the switching controller 6 controls the switching valve 5 to switch the pneumatic valve 11 to communicate with the main control component 2, including:

[0081] The switching controller 6 controls the switching valve 5 to switch the pneumatic valve 11 to be connected to the first flow amplifier 22 .

[0082] In some embodiments, the method further comprises:

[0083] The first valve position feedback device 7 feeds back the current valve position signal to the main controller 4 via the first positioner 21, or the second valve position feedback device 8 feeds back the current valve position signal to the main controller 4 via the second positioner 31. The main controller 4 compares the current valve position signal with the target valve position signal to adjust the output of the control signal. Feedback based on the current valve position signal of the active control component 2 or the backup control component 3 ensures the reliability and accuracy of the single-column control.

[0084] In some embodiments, the switching controller 6 reads the status of the active control component 2 and the standby control component 3, including:

[0085] The switching controller 6 reads the status of the first positioner 21 and the second positioner 31, and the status includes at least one of the internal data of the first positioner 21 and the second positioner 31, the pneumatic signals output by the first positioner 21 and the second positioner 31, the reading instruction signals received by the first positioner 21 and the second positioner 31, and the current valve position signals received by the first positioner 21 and the second positioner 31.

[0086] The switching controller 6 determines the fault conditions of the active control component 2 and the standby control component 3 according to the read states of the active control component 2 and the standby control component 3, including:

[0087] The switching controller 6 determines the fault conditions of the first positioner 21 and the second positioner 31 according to the read states of the first positioner 21 and the second positioner 31 .

[0088] For example, currently the main control component 2 and the backup control component 3 are redundant with each other. Under normal operating conditions, the signal output by the switching controller 6 to the switching valve 5 is 0, and the switching valve 5 switches to the pneumatic valve 11 and is connected to the main control component 2. The switching controller 6 can read the status of the first positioner 21 and the second positioner 31 through HART protocol communication. The status includes at least one of the internal data of the first positioner 21 and the second positioner 31, the pneumatic signals output by the first positioner 21 and the second positioner 31, the reading instruction signals received by the first positioner 21 and the second positioner 31, and the current valve position signals received by the first positioner 21 and the second positioner 31. When the switching controller 6 determines that at least one of the following situations occurs, the switching controller 6 outputs a signal 1 to the switching valve 5, that is, the switching valve 5 switches to the pneumatic valve 11 and is connected to the second flow amplifier 32.

[0089] (1) Determining whether the first positioner 21 is faulty based on the internal data of the first positioner 21;

[0090] (2) determining that the read instruction signal is lost based on the read instruction signal received by the first locator 21, where the read instruction signal is sent by the switching controller 6 to the first locator 21 and the second locator 31;

[0091] (3) Based on the pneumatic signal output by the first positioner 21, it is determined whether the deviation from the control signal received by the first positioner 21 reaches a first threshold value. For example, the first threshold value is initially set to 4%, and can be set to a value of 1% to 100% according to actual needs. It can be understood that the control signals sent by the main controller 4 to the first positioner 21 and the second positioner 31 are simultaneously sent and recorded in the switching controller 6;

[0092] (4) Based on the current valve position signal received by the first positioner 21, it is determined whether the target valve position signal reaches a second threshold. For example, the second threshold is initially set to 10%, and can be set to a value of 1% to 100% according to actual needs. It can be understood that the target valve position signal will also be recorded in the switching controller 6.

[0093] When the switching controller 6 determines that at least one of the above conditions has occurred, the switching controller 6 outputs a signal of 1 to the switching valve 5 and maintains it. The switching controller 6 also records and displays the switching determination process and feeds back the switching determination process and alarm signal to the main controller 4, enabling the upstream main controller 4 to promptly detect and address the failure of the downstream primary control component 2. It is understood that when the first positioner 21 returns to normal operation, the switching controller 6 can control the switching valve 5 to switch the pneumatic valve 11 to the first flow amplifier 22.

[0094] If the first positioner 21 is operating normally and the second positioner 31 has the above fault, the switching controller 6 will keep the signal output to the switching valve 5 at 0, and the switching controller 6 will not control the switching valve 5 to perform the switching action.

[0095] In some embodiments, during each overhaul calibration process, the pneumatic valve 11 can be calibrated separately using the main control component 2 and the backup control component 3, and the positioner parameters of the main control component 2 and the backup control component 3 can be adjusted to be consistent as much as possible to ensure that the backup signal can maintain good matching with the main signal during the parallel main and backup operation process.

[0096] It is understandable that the above embodiments only express some implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all fall within the scope of protection of the present invention, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A redundant control system for a pneumatic valve, characterized in that: It comprises an air source (1), a main control component (2), a backup control component (3), a main controller (4), a switching valve (5) and a switching controller (6); One path of the gas source (1) is connected to the switching valve (5) via the main control component (2), and another path of the gas source (1) is connected to the switching valve (5) via the backup control component (3), and the switching valve (5) is connected to the pneumatic valve (11); The main controller (4) is respectively connected to the main control component (2) and the backup control component (3), and the main controller (4) is used to send the same control signal to the main control component (2) and the backup control component (3), so as to control the main control component (2) and the backup control component (3) to output the same airflow to the switching valve (5); The switching controller (6) is in communication with the main control component (2), the backup control component (3) and the switching valve (5). The switching controller (6) is used to judge and control the switching valve (5) based on the states of the main control component (2) and the backup control component (3) read in real time, and switch the pneumatic valve (11) to communicate with the main control component (2) or the backup control component (3).

2. The redundant control system of the pneumatic valve according to claim 1, characterized in that: The main controller (4) is also in communication with the switching controller (6), and the switching controller (6) is used to read in real time the failure of the main control component (2) and / or the backup control component (3), and feed back an alarm signal to the main controller (4).

3. The redundant control system of the pneumatic valve according to claim 1, characterized in that: The switching controller (6) is further configured to initially control the switching valve (5) to switch to the pneumatic valve (11) to be connected to the main control component (2); and is further configured to record and display a switching judgment process, and feed the switching judgment process back to the main controller (4). The switching judgment process is a process in which the switching controller (6) judges and controls the switching valve (5) when reading the status of the main control component (2) and the backup control component (3) in real time, and switches to the pneumatic valve (11) to be connected to the backup control component (3).

4. The redundant control system of a pneumatic valve according to claim 1, characterized in that: The switching controller (6) is provided with a manual switch, and the manual switch is used to fixedly select the main control component (2) for air pressure output.

5. The redundant control system of a pneumatic valve according to claim 1, characterized in that: The main control component (2) includes a first positioner (21), and the backup control component (3) includes a second positioner (31); The switching controller (6) is respectively connected to the first positioner (21) and the second positioner (31) for communication, and the switching controller (6) is used to judge and control the switching valve (5) according to the states of the first positioner (21) and the second positioner (31) read in real time.

6. The redundant control system of the pneumatic valve according to claim 5, characterized in that: The main control component (2) further includes a first flow amplifier (22), and the backup control component (3) further includes a second flow amplifier (32); The main controller (4) is communicatively connected to the first positioner (21) and the second positioner (31) respectively; The first positioner (21) is used to adapt the control signal of the main controller (4) to output a pneumatic signal to the first flow amplifier (22), and the first flow amplifier (22) is used to amplify the output flow according to the pneumatic signal; The second positioner (31) is used to adapt the control signal of the main controller (4) to output a pneumatic signal to the second flow amplifier (32), and the second flow amplifier (32) is used to amplify the output flow according to the pneumatic signal.

7. The redundant control system of a pneumatic valve according to claim 6, characterized in that: The redundant control system of the pneumatic valve further comprises a first valve position feedback device (7) and a second valve position feedback device (8) provided on the pneumatic valve (11); The first valve position feedback device (7) is in communication with the first positioner (21), and the first valve position feedback device (7) is used to feed back a current valve position signal to the main controller (4) via the first positioner (21), and the main controller (4) is used to compare the current valve position signal with a target valve position signal to adjust the output of the control signal; The second valve position feedback is communicatively connected to the second positioner (31), and the second valve position feedback (8) is used to feed back the current valve position signal to the main controller (4) via the second positioner (31), and the main controller (4) is used to compare the current valve position signal with the target valve position signal to adjust the output of the control signal.

8. The redundant control system of a pneumatic valve according to claim 7, characterized in that: The states of the main control component (2) and the backup control component (3) include at least one of internal data of the first positioner (21) and the second positioner (31), pneumatic signals output by the first positioner (21) and the second positioner (31), read instruction signals received by the first positioner (21) and the second positioner (31), and current valve position signals received by the first positioner (21) and the second positioner (31).

9. The redundant control system of a pneumatic valve according to claim 1, characterized in that: The main controller (4) is provided with two output cards, one of which is in communication connection with the main control component (2) and is used to output a control signal to the main control component (2); and the other of which is in communication connection with the backup control component (3) and is used to output the same control signal to the backup control component (3).

10. A redundant control method for a pneumatic valve, characterized in that: The method is applied to the redundant control system of the pneumatic valve according to any one of claims 1 to 9, and the method comprises the following steps: The main controller (4) sends the same control signal to the main control component (2) and the backup control component (3), respectively, and the main control component (2) and the backup control component (3) output the same airflow to the switching valve (5); The switching controller (6) controls the switching valve (5) to switch the pneumatic valve (11) to communicate with the main control component (2); The switching controller (6) reads the status of the main control component (2) and the backup control component (3); The switching controller (6) determines the fault conditions of the main control component (2) and the backup control component (3) based on the read states of the main control component (2) and the backup control component (3); If the main control component (2) fails and the backup control component (3) is normal, the switching controller (6) controls the switching valve (5) to switch the pneumatic valve (11) to communicate with the backup control component (3).

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