State signal detection method and system of regulating valve

Abstract

The invention discloses a method and system for detecting a state signal of a regulating valve, and the method comprises the steps: judging whether the state signal of a target regulating valve participates in a key function or not, and if yes, adding a redundant limit switch to the regulating valve; verifying the redundant limit switch according to a switch threshold value of an original limit switch of the regulating valve; acquiring a first switching value signal of the original limit switch and a second switching value signal of the redundant limit switch; and the actual state of the regulating valve is judged according to the first switching value signal and the second switching value signal.

Description

Technical Field

[0001] The present invention relates to the field of instrumentation and control equipment for nuclear power plants, and in particular to a state signal detection method and system for a regulating valve. Background Art

[0002] The valve limit switch is a local instrument for detecting the valve status. It can detect the status signal of the regulating valve through the valve limit switch and transmit the information to the control system in the form of a switch signal. The control system takes corresponding actions according to the switch status.

[0003] In a nuclear power plant, the status signals of some control valves in the nuclear power plant can characterize the operating status of the system and participate in the regulation of key functions, including but not limited to participating in the evaporator water level regulation, the primary circuit average temperature regulation, etc. Therefore, accurately identifying the status signals of the control valves is important for the safe and stable operation of the nuclear power units.

[0004] In the related art, the state signal of the regulating valve is detected by a single limit switch. If the limit switch fails, the actual switch state of the regulating valve cannot be fed back, which may cause misjudgment of the control system. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method and system for detecting a state signal of a regulating valve.

[0006] The technical solution adopted by the present invention to solve the technical problem is: constructing a state signal detection method of a regulating valve, the method comprising:

[0007] Determine whether the state signal of the target regulating valve participates in the key function, and if so, add a redundant limit switch to the regulating valve;

[0008] Verifying the redundant limit switch according to the switch threshold of the original limit switch of the regulating valve;

[0009] Acquire a first switch signal of the original limit switch and a second switch signal of the redundant limit switch;

[0010] The actual state of the regulating valve is determined by combining the first switching signal and the second switching signal.

[0011] Preferably, in the state signal detection method of the regulating valve constructed in the present invention, the step of adding a redundant limit switch to the regulating valve includes:

[0012] Obtaining the limit type of the original limit switch on the regulating valve;

[0013] If the original limit switch is an open limit switch, the redundant limit switch is also set as an open limit switch; if the original limit switch is a closed limit switch, the redundant limit switch is also set as a closed limit switch.

[0014] Preferably, in the state signal detection method of the regulating valve constructed in the present invention, the checking of the redundant limit switch according to the switch threshold of the original limit switch of the regulating valve comprises:

[0015] A first action threshold and a first reset threshold of the original limit switch are acquired, and the first action threshold and the first reset threshold are correspondingly set as a third action threshold and a second reset threshold of the redundant limit switch.

[0016] Preferably, in the state signal detection method of the regulating valve constructed in the present invention, the step of obtaining the first switch signal of the original limit switch and the second switch signal of the redundant limit switch includes:

[0017] If the original limit switch is actuated, the first switch signal is 1; if the original limit switch is reset, the first switch signal is 0;

[0018] If the redundant limit switch is actuated, the first switch signal is 0; if the redundant limit switch is reset, the first switch signal is 1.

[0019] Preferably, in the state signal detection method of the regulating valve constructed in the present invention, the combining of the first switch signal and the second switch signal to determine the actual state of the regulating valve includes:

[0020] When the original limit switch is an open limit switch, then:

[0021] If the first switch signal of the original limit switch is 1, and the second switch signal of the redundant limit switch is 0, it is determined that the actual state of the regulating valve is a closed state;

[0022] If the first switch signal of the original limit switch is 0, and the second switch signal of the redundant limit switch is 1, it is determined that the actual state of the regulating valve is a non-closed state;

[0023] If the original limit switch is a closed limit switch, then:

[0024] If the first switch signal of the original limit switch is 1, and the second switch signal of the redundant limit switch is 0, it is determined that the actual state of the regulating valve is an open state;

[0025] If the first switch signal of the original limit switch is 0, and the second switch signal of the redundant limit switch is 1, it is determined that the actual state of the regulating valve is a non-open state.

[0026] Preferably, in the state signal detection method of the regulating valve constructed in the present invention, before judging the actual state of the regulating valve by combining the first switch signal and the second switch signal, the following steps are performed: obtaining a valve opening feedback signal of the regulating valve;

[0027] Furthermore, the combining the first switch signal and the second switch signal to determine the actual state of the regulating valve includes:

[0028] Combining the first switch value signal, the second switch value signal and the valve opening feedback signal, executing a three-out-of-two algorithm to obtain a regulating valve state judgment signal;

[0029] The actual state of the regulating valve is determined according to the regulating valve state determination signal.

[0030] Preferably, in the state signal detection method of the regulating valve constructed by the present invention, the combination of the first switch signal, the second switch signal and the valve opening feedback signal to perform a two-out-of-three algorithm to obtain the regulating valve state judgment signal includes:

[0031] If the original limit switch is an open limit switch, then:

[0032] Taking a logic value of the first switch signal to obtain a first judgment logic value;

[0033] Inverting the logic value of the second switch signal to obtain a second judgment logic value;

[0034] Determine whether the valve opening feedback signal is less than the first action threshold, if so, the third determination logic value is 1, if not, the third determination logic value is 0;

[0035] If any two of the first judgment logic value, the second judgment logic value and the third judgment logic value are consistent in magnitude, the regulating valve state judgment signal is set to be the same as the above two consistent signals;

[0036] The determining the actual state of the regulating valve according to the regulating valve state determination signal comprises:

[0037] If the regulating valve state judgment signal is 1, the actual state of the regulating valve is an open state;

[0038] If the regulating valve state judgment signal is 0, the actual state of the regulating valve is a non-open state;

[0039] If the original limit switch is a closed limit switch, then:

[0040] Taking a logic value of the first switch signal to obtain a first judgment logic value;

[0041] Inverting the logic value of the second switch signal to obtain a second judgment logic value;

[0042] Determine whether the valve opening feedback signal is greater than the first action threshold, if so, the third determination logic value is 1, if not, the third determination logic value is 0;

[0043] If any two of the first judgment logic value, the second judgment logic value and the third judgment logic value are consistent in magnitude, the regulating valve state judgment signal is set to be the same as the above two consistent signals;

[0044] The determining the actual state of the regulating valve according to the regulating valve state determination signal comprises:

[0045] If the regulating valve state judgment signal is 1, the actual state of the regulating valve is closed;

[0046] If the regulating valve state judgment signal is 0, the actual state of the regulating valve is a non-closed state.

[0047] Preferably, in the state signal detection method of the regulating valve constructed by the present invention, the method further includes the following steps:

[0048] According to the first switch quantity signal, the second switch quantity signal and the valve opening feedback signal, it is judged whether the state signal detection function of the regulating valve is normal, and if not, an alarm is issued.

[0049] Preferably, in the state signal detection method of the regulating valve constructed by the present invention, the state signal detection function of the regulating valve is judged whether it is normal based on the first switch signal, the second switch signal and the valve opening feedback signal, and if not, an alarm is issued, including: judging whether the first switch signal and the valve opening feedback signal are consistent, and if so, judging that the first condition is met; judging whether the first switch signal and the second switch signal are consistent, and if not, judging that the second condition is met; judging whether the second switch signal and the valve opening feedback signal are consistent, and if not, judging that the third condition is met; if any one of the first condition, the second condition and the third condition is not met, the state signal detection function of the regulating valve is judged to be abnormal and an alarm is issued.

[0050] The present invention further provides a state signal detection system for a regulating valve, which executes any one of the above-mentioned state signal detection methods for a regulating valve.

[0051] By implementing the present invention, the following beneficial effects are achieved:

[0052] By setting the action threshold and reset threshold corresponding to the original limit switch and the redundant limit switch, a basis is provided for the subsequent verification steps of the original limit switch and the redundant limit switch, thereby improving the reliability of detecting the state signal of the regulating valve.

[0053] Through the pre-designed judgment rules and the action thresholds and reset thresholds corresponding to the original limit switch and the redundant limit switch, the state signal of the original limit switch and the state signal corresponding to the redundant switch are judged respectively, and the state signal of the original limit switch is verified by the state signal of the redundant limit switch, which prevents the control system from making a misjudgment when a single limit switch fails, thereby affecting the control function, and improves the reliability of detecting the state signal of the regulating valve.

[0054] By introducing the "three out of two" algorithm, it is possible to tolerate the failure or abnormality of the signal source of a certain limit switch, which can prevent the control system from making misjudgments when a single limit switch fails, thereby affecting the control function and improving the reliability of the status signal of the control valve. At the same time, by designing a valve status deviation alarm device, it is possible to achieve cross-verification and early warning of the valve position feedback signal and the limit switch action status. When an alarm occurs, the operator is reminded to intervene in time and to troubleshoot the limit switch and valve position feedback faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0056] Figure 1 is a flow chart of a method for detecting a state signal of a regulating valve in a first embodiment of the present invention;

[0057] Figure 2 Schematic diagram of a closed state judgment scheme of a regulating valve in a first embodiment of the present invention;

[0058] Figure 3 Schematic diagram of a scheme for judging the opening state of a regulating valve in a first embodiment of the present invention;

[0059] Figure 4 is a schematic diagram of a first cross-validation scheme in a first embodiment of the present invention;

[0060] Figure 5 is a schematic diagram of the second cross-validation scheme in the first embodiment of the present invention;

[0061] Figure 61 is a schematic diagram of the principle of the closed state judgment scheme of the regulating valve in the first embodiment of the present invention;

[0062] Figure 7 It is a schematic diagram of the principle of the opening state judgment scheme of the regulating valve in the first embodiment of the present invention. DETAILED DESCRIPTION

[0063] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation of the present invention is now described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0064] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0065] The block diagrams shown in the accompanying drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0066] The embodiment of the present invention provides a method for detecting a state signal of a regulating valve, and the execution subject of the method for detecting a state signal of a regulating valve includes but is not limited to at least one of the electronic devices such as a client and a mobile terminal that can be configured to execute the method provided by the embodiment of the present application. The mobile terminal includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc.

[0067] In the present invention, the logic value corresponding to the signal is set to 1 for "true", and the logic value corresponding to the signal is set to 0 for "false".

[0068] See also Figure 1 The first embodiment of the present invention discloses a method for detecting a state signal of a regulating valve, the method comprising: determining whether a state signal of a target regulating valve participates in a key function, and if so, adding a redundant limit switch to the regulating valve; verifying the redundant limit switch according to a switch threshold of an original limit switch of the regulating valve; obtaining a first switch signal of the original limit switch and a second switch signal of the redundant limit switch; and determining the actual state of the regulating valve by combining the first switch signal and the second switch signal.

[0069] In the embodiment of the present invention, the state signal of the regulating valve refers to the opening or state information of the regulating valve detected by the limit switch. The key function refers to an important control function or protection function. For example, in the nuclear power scenario, the key function refers to the evaporator water level regulation, the primary circuit average temperature regulation, etc. The redundant limit switch refers to at least one additional limit switch that also participates in the detection when the regulating valve already has a limit switch.

[0070] There are two situations for the status signal of the control valve. The first is that it does not participate in the regulation of key functions and is only used for auxiliary system operation, feedback data, etc., such as feedback of real-time data of the control valve. At this time, the status signal of the control valve does not directly affect important control or protection functions; the second is that it participates in the regulation of key functions. For example, the status information of the control valve participates in the regulation of the evaporator water level, the regulation of the average temperature of the primary circuit and other key functions. When the status signal of the control valve participates in key functions, accurately detecting the status signal of the control valve can avoid misjudgment of the control system and introduce huge risks.

[0071] Specifically, the methods of identifying the state signal of the regulating valve participating in key functions include but are not limited to:

[0072] Query the mapping relationship between the status signal and the key function, collect the status signal of the control valve, and determine whether the status signal of the control valve is involved in the key function according to the pre-stored signal function mapping table; analyze the dependency relationship between the status signal and the key function, and use the preset dependency analysis tool or algorithm to detect whether the status signal of the control valve has a dependency relationship with the key function to determine whether the status signal is involved in the key function; it is also possible to train a machine model and automatically identify whether the status signal of the control valve is involved in the key function through the trained model, wherein the machine model includes all models that can automatically identify whether the status signal of the control valve is involved in the key function, such as convolutional neural networks.

[0073] In this embodiment, when it is identified that the status signal of the control valve does not participate in the key function, a data acquisition device is installed on the control valve to monitor the changes in the status signal in real time, and regularly collect data sets of status signal data, and determine whether the control valve is abnormal based on the data sets.

[0074] Furthermore, according to the core principle of the present invention, a suitable switch type should be selected when adding a redundant limit switch. Therefore, in the state signal detection method of the regulating valve constructed by the present invention, adding a redundant limit switch to the regulating valve includes: obtaining the limit type of the original limit switch on the regulating valve; if the original limit switch is an open limit switch, then the redundant limit switch is also set to an open limit switch; if the original limit switch is a closed limit switch, then the redundant limit switch is also set to a closed limit switch.

[0075] See also Figures 3 to 5 In this embodiment, when it is identified that the open state signal of the regulating valve is involved in a key function, a redundant open limit switch (SM4) is added to the regulating valve on the basis of the original open limit switch (SM3). When it is identified that the closed state signal of the regulating valve is involved in a key function, a redundant closed limit switch (SM4) is added to the regulating valve on the basis of the original closed limit switch (SM5). By adding a redundant limit switch, it is possible to prevent a single limit switch from malfunctioning and causing a misjudgment of the control system, thereby affecting the control function, and improve the reliability of detecting the state signal of the regulating valve.

[0076] Furthermore, when detecting the same limit switch, its action threshold and reset threshold can be used to indicate the valve state of the regulating valve. In the state signal detection method of the regulating valve disclosed in this embodiment, the redundant limit switch is verified according to the switch threshold of the original limit switch of the regulating valve, including: obtaining the first action threshold and the first reset threshold of the original limit switch, and setting the first action threshold and the first reset threshold to the third action threshold and the second reset threshold of the redundant limit switch. Among them, the first action threshold and the first reset threshold can be equal, but in a preferred case, a reset hysteresis value should be set between the first action threshold and the first reset threshold to avoid frequent action of the limit switch. For example, the difference between the first action threshold and the first reset threshold is 3%. Further, the second action threshold and the second reset threshold are also the same.

[0077] In an implementable example, assuming that the action threshold is set to 10% and the reset threshold is set to 13%, when the valve opening of the regulating valve is less than or equal to 10%, the limit switch of the regulating valve will indicate that the valve is in a closed state. When the valve opening is from less than or equal to 10% to greater than or equal to 13%, it will indicate that the valve is in a non-closed state, and 3% of it is the set reset differential value. If the differential value is not set, when the valve opening hovers around 10%, the limit switch will frequently operate.

[0078] Furthermore, the action and reset of the original limit switch and the redundant limit switch depend on the switch state of the target regulating valve. When the actual opening of the regulating valve is lower than the first action threshold, the original limit switch is actuated, and when the actual opening of the regulating valve is higher than the first reset threshold, the original limit switch is reset. The above setting is the same for the redundant limit switch. In the state signal detection method of the regulating valve disclosed in this embodiment, the first switch signal of the original limit switch and the second switch signal of the redundant limit switch are obtained, including: if the original limit switch is actuated, the first switch signal is 1, and if the original limit switch is reset, the first switch signal is 0. If the redundant limit switch is actuated, the first switch signal is 0, and if the redundant limit switch is reset, the first switch signal is 1.

[0079] In this embodiment, a redundant limit switch is added on the basis of the original limit switch of the regulating valve. When wiring on site, the original open limit switch (SM3) takes the normally open contact (NO), and the redundant open limit switch (SM4) takes the normally closed contact (NC). The original closed limit switch (SM5) takes the normally open contact (NO), and the redundant closed limit switch (SM6) takes the normally closed contact (NC). When the valve opening of the regulating valve meets the action / reset threshold, the contact will provide a signal to determine whether the regulating valve is open / closed, ensuring that the state of the valve is correctly monitored. It avoids operational errors due to signal loss or misreading, improves the reliability of detecting the state signal of the regulating valve, and can also avoid the influence of common mode failures of the limit switch and the acquisition card, thereby improving the stability of the system.

[0080] In this embodiment, a judgment rule is pre-designed for selecting the contacts of the original open limit switch, the redundant open limit switch, the original close limit switch, and the redundant close limit switch, including:

[0081] During the original open limit switch detection, when the valve opening is greater than or equal to the first action threshold, it is set to 1: the valve is in the open state; when the valve opening is less than or equal to the first reset threshold, it is set to 0: the valve is in the non-open state.

[0082] During redundant open limit switch detection, when the valve opening is greater than or equal to the first action threshold, it is set to 0: the valve is in the open state; when the valve is less than or equal to the first reset threshold, it is set to 1: the valve is in the non-open state.

[0083] During the original closed limit switch detection, when the valve opening is less than or equal to the second action threshold, it is set to 1: the valve is in the closed state; when the valve opening is greater than or equal to the second reset threshold, it is set to 0: the valve is in the non-closed state.

[0084] During redundant closing limit switch detection, when the valve opening is less than or equal to the second action threshold, it is set to 0: the valve is in a closed state; when the valve is greater than or equal to the second reset threshold, it is set to 1: the valve is in a non-closed state.

[0085] In this embodiment, the status signal of the original limit switch and the status signal corresponding to the redundant limit switch are judged respectively through the pre-designed judgment rules and the action thresholds and reset thresholds corresponding to the original limit switch and the redundant limit switch, and the status signal of the original limit switch is verified by the status signal of the redundant limit switch, thereby preventing the control system from making a misjudgment due to a single limit switch failure, thereby avoiding the possible impact on the control function and improving the reliability of detecting the status signal of the regulating valve.

[0086] Thus, the actual state of the regulating valve can be determined by the switch quantity signals of the original limit switch and the redundant limit switch. In the state signal detection method of the regulating valve constructed by the present invention, the actual state of the regulating valve is determined by combining the first switch quantity signal and the second switch quantity signal, including:

[0087] When the original limit switch is an open limit switch, then: if the first switch signal of the original limit switch is 1 and the second switch signal of the redundant limit switch is 0, it is determined that the actual state of the regulating valve is a closed state; if the first switch signal of the original limit switch is 0 and the second switch signal of the redundant limit switch is 1, it is determined that the actual state of the regulating valve is a non-closed state.

[0088] If the original limit switch is a closed limit switch, then: if the first switch signal of the original limit switch is 1 and the second switch signal of the redundant limit switch is 0, it is determined that the actual state of the regulating valve is an open state; if the first switch signal of the original limit switch is 0 and the second switch signal of the redundant limit switch is 1, it is determined that the actual state of the regulating valve is a non-open state.

[0089] Furthermore, in order to provide a more accurate result of detecting the actual state of the regulating valve, in the state signal detection method of the regulating valve constructed by the present invention, before judging the actual state of the regulating valve by combining the first switch signal and the second switch signal, the following steps are performed: obtaining the valve opening feedback signal of the regulating valve. Furthermore, judging the actual state of the regulating valve by combining the first switch signal and the second switch signal includes: combining the first switch signal, the second switch signal and the valve opening feedback signal, executing a three-out-of-two algorithm to obtain a regulating valve state judgment signal; judging the actual state of the regulating valve according to the regulating valve state judgment signal.

[0090] See also Figure 6 to Figure 7 , the valve opening feedback signal is an analog signal fed back by the positioner installed on the control valve. The positioner is the main accessory of the control valve, installed on the control valve, and is used to automatically adjust the valve position to ensure that the valve is accurately opened or closed to the specified position. The position data is measured based on the sensor on the control valve or other equipment that can measure the valve position, and the position data is converted into a signal and sent to the positioner. At this time, the signal received by the positioner is the valve opening feedback signal (PT.AI).

[0091] The valve position feedback signal fed back by the positioner installed on the control valve is obtained. According to the valve position feedback signal, the first switch signal and the second switch signal, the "three out of two (D2V3)" algorithm is used to vote on the logical negation result of the first switch signal, the second switch signal and the valve opening feedback signal to obtain the voting result, and the target state signal of the control valve is determined according to the voting result. Among them, the "three out of two" algorithm is a common redundant voting algorithm used to improve the reliability and safety of the system. In this algorithm, there are three identical units or signal sources, which perform the same task or measurement at the same time. The system will vote according to the output of these three signals, and only when the results of at least two signals are consistent, the system will consider the result to be correct or safe. This method is often used in important protection circuits to ensure that the system can still make correct decisions when a single signal fails.

[0092] Furthermore, in the state signal detection method of the regulating valve constructed by the present invention, the combination of the first switch signal, the second switch signal and the valve opening feedback signal, and the execution of a three-out-of-two algorithm to obtain the regulating valve state judgment signal include: if the original limit switch is an open limit switch, then:

[0093] Taking a logic value of the first switch signal to obtain a first judgment logic value;

[0094] Inverting the logic value of the second switch signal to obtain a second judgment logic value;

[0095] Determine whether the valve opening feedback signal is less than the first action threshold, if so, the third determination logic value is 1, if not, the third determination logic value is 0;

[0096] If any two of the first judgment logic value, the second judgment logic value and the third judgment logic value are consistent in magnitude, the regulating valve state judgment signal is set to be the same as the above two consistent signals;

[0097] The determining the actual state of the regulating valve according to the regulating valve state determination signal comprises:

[0098] If the regulating valve state judgment signal is 1, the actual state of the regulating valve is an open state;

[0099] If the regulating valve state judgment signal is 0, the actual state of the regulating valve is a non-open state;

[0100] If the original limit switch is a closed limit switch, then:

[0101] Taking a logic value of the first switch signal to obtain a first judgment logic value;

[0102] Inverting the logic value of the second switch signal to obtain a second judgment logic value;

[0103] Determine whether the valve opening feedback signal is greater than the first action threshold, if so, the third determination logic value is 1, if not, the third determination logic value is 0;

[0104] If any two of the first judgment logic value, the second judgment logic value and the third judgment logic value are consistent in magnitude, the regulating valve state judgment signal is set to be the same as the above two consistent signals;

[0105] The determining the actual state of the regulating valve according to the regulating valve state determination signal comprises:

[0106] If the regulating valve state judgment signal is 1, the actual state of the regulating valve is closed;

[0107] If the regulating valve state judgment signal is 0, the actual state of the regulating valve is a non-closed state.

[0108] See also Figure 2 In this embodiment, when it is identified that the closing state signal of the regulating valve is involved in the key function, the first action threshold is used as the second judgment threshold (a%), and a value less than the second judgment threshold is set for subsequent logical judgment. The valve opening feedback signal is logically judged according to the value less than the second judgment threshold, and the judgment result of the valve opening feedback signal is obtained as "true" or "false", and the logical results of the state signal corresponding to the original closing limit switch and the state signal corresponding to the redundant closing limit switch are respectively obtained as "true" or "false". Assuming that the logical result of the valve opening feedback signal is "true", the logical results of the state signal corresponding to the original closing limit switch and the state signal corresponding to the redundant closing limit switch are both "true", then any one of the results is taken as the table judged by the "three out of two" algorithm. The voting signal is used to determine whether the control valve is in a closed state; assuming that the logic result of the valve opening feedback signal is "true", the logic result of the state signal corresponding to the original closing limit switch is "false", and the logic result of the state signal corresponding to the redundant closing limit switch is "true", then take two identical results as the voting signals determined by the "three out of two" algorithm, and use the voting signal to determine whether the control valve is in a closed state; assuming that the logic result of the valve opening feedback signal is "false", the logic result of the state signal corresponding to the original closing limit switch is "false", and the logic result of the state signal corresponding to the redundant closing limit switch is "true", then take two identical results as the voting signals determined by the "three out of two" algorithm, and use the voting signal to determine whether the control valve is in a non-closed state.

[0109] See also Figure 3In this embodiment, when it is identified that the open state signal of the regulating valve participates in the key function, the first action threshold is used as the first judgment threshold (c%), and a value greater than the first judgment threshold is set as "true" for subsequent logical judgment. A logical judgment is made on the valve opening feedback signal based on the value greater than the first judgment threshold, and a judgment result of the valve opening feedback signal is obtained as "true" or "false", and the logical result of the negation of the first switch signal and the second switch signal is obtained as "true" or "false". Assuming that the logic result of the valve opening feedback signal is "true", the logic result of the first switch signal and the logic result of the second switch signal taken negated are both "true", then any one of the results is taken as the voting signal determined by the "three out of two" algorithm, and the voting signal is used to determine whether the control valve is in the open state; assuming that the logic result of the valve opening feedback signal is "true", the logic result of the first switch signal is "false", and the logic result of the second switch signal taken negated is "true", then two identical results are taken as the voting signals determined by the "three out of two" algorithm, and the voting signal is used to determine whether the control valve is in the open state; assuming that the logic result of the valve opening feedback signal is "false", the logic result of the first switch signal is "false", and the logic result of the second switch signal taken negated is "true", then two identical results are taken as the voting signals determined by the "three out of two" algorithm, and the voting signal is used to determine whether the control valve is in the non-open state.

[0110] In order to further improve the reliability of the state judgment function of the regulating valve, a valve closing state deviation alarm device is added, and the action of the limit switches SM5 and SM6 and the correctness of the valve opening feedback signal are cross-verified. In the state signal detection method of the regulating valve disclosed in this embodiment, the method also includes the following steps: judging whether the state signal detection function of the regulating valve is normal according to the first switch signal, the second switch signal and the valve opening feedback signal, if not, an alarm is issued. Since the verification of the valve position feedback will have a certain accuracy deviation, in some embodiments, a 1s delay is designed for the alarm signal to filter the instantaneous signal.

[0111] Further, in the state signal detection method of the regulating valve constructed by the present invention, the state signal detection function of the regulating valve is judged whether it is normal based on the first switch signal, the second switch signal and the valve opening feedback signal, and if not, an alarm is issued, including: judging whether the first switch signal and the valve opening feedback signal are consistent, and if so, judging that the first condition is met; judging whether the first switch signal and the second switch signal are consistent, and if not, judging that the second condition is met; judging whether the second switch signal and the valve opening feedback signal are consistent, and if not, judging that the third condition is met; if any one of the first condition, the second condition and the third condition is not met, the state signal detection function of the regulating valve is judged to be abnormal and an alarm is issued.

[0112] See also Figure 4 and Figure 5 In one embodiment, in order to issue an alarm, after determining the target state signal of the regulating valve according to the valve position feedback signal and the first switch signal and the second switch signal, the method further includes: adding a first valve state deviation alarm device 001KA or a second valve state deviation alarm device 002KA; cross-verifying the valve position opening feedback signal and the first switch signal and the second switch signal; when the verification fails, the valve state deviation alarm device issues an alarm message to the user.

[0113] See also Figure 4 In order to perform cross-verification, in this embodiment, when it is identified that the open state signal of the regulating valve is involved in the key function, the first action threshold and the first reset threshold are introduced to verify the detection function.

[0114] When the closed state signal of the regulating valve participates in the key function, the valve opening feedback signal is logically judged according to being greater than the first action signal and less than the second action signal, and the judgment result of the feedback signal is "true" or "false". In addition, the logical results "true" or "false" of the first switch signal and the second switch signal are obtained respectively. Assuming that the logical result of the feedback signal is "false" and the first switch signal is "false", the decision signal corresponding to the original open limit switch is "false". It is judged whether the results judged by the first judgment threshold and the second judgment threshold on the original open limit switch meet the "opposite" relationship. When they meet, the verification is passed, and the valve state deviation alarm device does not issue an alarm. When they do not meet, the verification fails, and the valve state deviation alarm device issues an alarm. Similarly, it is judged whether the results judged by the first judgment threshold and the second judgment threshold on the original redundant open limit switch meet the "opposite" relationship. When they meet, the verification is passed, and the valve state deviation alarm device does not issue an alarm. When they do not meet, the verification fails, and the valve state deviation alarm device issues an alarm.

[0115] In this embodiment, when it is recognized that the closing state signal of the regulating valve is involved in a key function, the second reset threshold is used as the second judgment threshold, and a value greater than the second judgment threshold is set for subsequent logical judgment. The valve opening feedback signal is logically judged based on the value greater than the second judgment threshold, and the judgment result of the feedback signal is "true" or "false". The logical results "true" or "false" of the state signal corresponding to the original closing limit switch and the state signal corresponding to the redundant closing limit switch are obtained respectively. Assuming that the logical result of the feedback signal is "false" and the state signal corresponding to the original closing limit switch is "false", the state signal of the original closing limit switch obtained at this time is "false". The decision signal corresponding to the close is "false", and it is determined whether the results judged by the first judgment threshold and the second judgment threshold for the original close limit switch meet the "opposite" relationship. If so, the verification is passed, and the valve state deviation alarm device does not sound an alarm. If not, the verification fails, and the valve state deviation alarm device sounds an alarm. Similarly, it is determined whether the results judged by the first judgment threshold and the second judgment threshold for the original redundant close limit switch meet the "opposite" relationship. If so, the verification is passed, and the valve state deviation alarm device does not sound an alarm. If not, the verification fails, and the valve state deviation alarm device sounds an alarm.

[0116] In another embodiment, since the verification of valve position feedback may have a certain accuracy deviation, in order to effectively filter short-term signal fluctuations and reduce the possibility of false alarms, a preset time is designed as a pre-delay to filter the instantaneous signal.

[0117] In this embodiment, by adding a redundant limit switch, it is possible to prevent a single limit switch from failing, which would cause the control system to make a misjudgment and thus affect the control function, thereby improving the reliability of the state signal of the control valve.

[0118] The second embodiment of the present invention further discloses a state signal detection system for a regulating valve, which executes the state signal detection method for a regulating valve described in any one of the above embodiments.

[0119] In addition, the third embodiment of the present invention further discloses a computer-readable medium, which may be non-volatile or volatile. The computer-readable medium may be any one or any combination of a hard disk, a multimedia card, an SD card, a flash memory card, an SMC, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disk read-only memory (CD-ROM), a USB memory, etc. The computer-readable medium includes a data storage area and a program storage area, the data storage area stores data created according to the use of the blockchain node, and the program storage area stores a state signal detection program for a regulating valve, and the state signal detection program 10 of the regulating valve is executed by the processor to implement any one of the state signal detection methods of the regulating valve in the above embodiments.

[0120] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope 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 belong to the protection scope 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 changes 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 method for detecting a state signal of a regulating valve, characterized in that: The method comprises: Determine whether the state signal of the target regulating valve participates in the key function, and if so, add a redundant limit switch to the regulating valve; Verifying the redundant limit switch according to the switch threshold of the original limit switch of the regulating valve; Acquire a first switch signal of the original limit switch and a second switch signal of the redundant limit switch; The actual state of the regulating valve is determined by combining the first switching signal and the second switching signal.

2. The method for detecting a state signal of a regulating valve according to claim 1, characterized in that: The method of adding a redundant limit switch to the regulating valve comprises: Obtaining the limit type of the original limit switch on the regulating valve; If the original limit switch is an open limit switch, the redundant limit switch is also set as an open limit switch; if the original limit switch is a closed limit switch, the redundant limit switch is also set as a closed limit switch.

3. The method for detecting a state signal of a regulating valve according to claim 1, characterized in that: The checking of the redundant limit switch according to the switch threshold of the original limit switch of the regulating valve includes: A first action threshold and a first reset threshold of the original limit switch are acquired, and the first action threshold and the first reset threshold are correspondingly set as a third action threshold and a second reset threshold of the redundant limit switch.

4. The method for detecting a state signal of a regulating valve according to claim 2, characterized in that: The obtaining of the first switch signal of the original limit switch and the second switch signal of the redundant limit switch comprises: If the original limit switch is actuated, the first switch signal is 1; if the original limit switch is reset, the first switch signal is 0; If the redundant limit switch is actuated, the first switch signal is 0; if the redundant limit switch is reset, the first switch signal is 1.

5. The method for detecting a state signal of a regulating valve according to claim 4, characterized in that: The combining the first switch signal and the second switch signal to determine the actual state of the regulating valve includes: When the original limit switch is an open limit switch, then: If the first switch signal of the original limit switch is 1, and the second switch signal of the redundant limit switch is 0, it is determined that the actual state of the regulating valve is a closed state; If the first switch signal of the original limit switch is 0, and the second switch signal of the redundant limit switch is 1, it is determined that the actual state of the regulating valve is a non-closed state; If the original limit switch is a closed limit switch, then: If the first switch signal of the original limit switch is 1, and the second switch signal of the redundant limit switch is 0, it is determined that the actual state of the regulating valve is an open state; If the first switch signal of the original limit switch is 0, and the second switch signal of the redundant limit switch is 1, it is determined that the actual state of the regulating valve is a non-open state.

6. The method for detecting a state signal of a regulating valve according to claim 5, characterized in that: Before determining the actual state of the regulating valve by combining the first switching signal and the second switching signal, the following steps are performed: obtaining a valve opening feedback signal of the regulating valve; Furthermore, the combining the first switch signal and the second switch signal to determine the actual state of the regulating valve includes: Combining the first switch value signal, the second switch value signal and the valve opening feedback signal, executing a three-out-of-two algorithm to obtain a regulating valve state judgment signal; The actual state of the regulating valve is determined according to the regulating valve state determination signal.

7. The method for detecting a state signal of a regulating valve according to claim 6, characterized in that: The combining the first switch quantity signal, the second switch quantity signal and the valve opening feedback signal to execute a three-out-of-two algorithm to obtain a regulating valve state judgment signal includes: If the original limit switch is an open limit switch, then: Taking a logic value of the first switch signal to obtain a first judgment logic value; Inverting the logic value of the second switch signal to obtain a second judgment logic value; Determine whether the valve opening feedback signal is less than the first action threshold, if so, the third determination logic value is 1, if not, the third determination logic value is 0; If any two of the first judgment logic value, the second judgment logic value and the third judgment logic value are consistent in magnitude, the regulating valve state judgment signal is set to be the same as the above two consistent signals; The determining the actual state of the regulating valve according to the regulating valve state determination signal comprises: If the regulating valve state judgment signal is 1, the actual state of the regulating valve is an open state; If the regulating valve state judgment signal is 0, the actual state of the regulating valve is a non-open state; If the original limit switch is a closed limit switch, then: Taking a logic value of the first switch signal to obtain a first judgment logic value; Inverting the logic value of the second switch signal to obtain a second judgment logic value; Determine whether the valve opening feedback signal is greater than the first action threshold, if so, the third determination logic value is 1, if not, the third determination logic value is 0; If any two of the first judgment logic value, the second judgment logic value and the third judgment logic value are consistent in magnitude, the regulating valve state judgment signal is set to be the same as the above two consistent signals; The determining the actual state of the regulating valve according to the regulating valve state determination signal comprises: If the regulating valve state judgment signal is 1, the actual state of the regulating valve is closed; If the regulating valve state judgment signal is 0, the actual state of the regulating valve is a non-closed state.

8. The method for detecting a state signal of a regulating valve according to claim 6, characterized in that: The method further comprises the following steps: According to the first switch quantity signal, the second switch quantity signal and the valve opening feedback signal, it is judged whether the state signal detection function of the regulating valve is normal, and if not, an alarm is issued.

9. The method for detecting a state signal of a regulating valve according to claim 8, characterized in that: The method of judging whether the state signal detection function of the regulating valve is normal according to the first switch signal, the second switch signal and the valve opening feedback signal, and if not, issuing an alarm, comprises: Determine whether the first switch value signal is consistent with the valve opening feedback signal, and if so, determine that the first condition is met; Determine whether the first switch value signal and the second switch value are consistent, and if not, determine that the second condition is met; Determine whether the second switch value is consistent with the valve opening feedback signal, and if not, determine that the third condition is met; If any one of the first condition, the second condition and the third condition is not satisfied, it is determined that the state signal detection function of the regulating valve is abnormal and an alarm is issued.

10. A state signal detection system for a regulating valve, characterized in that: The system executes the state signal detection method of the regulating valve as described in any one of claims 1 to 9.

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