A control system for the overrun function of a pneumatic regulating valve

Abstract

The present invention belongs to the technical field of pneumatic regulating valves in nuclear power plants, and specifically relates to a control system for an overrun function of a pneumatic regulating valve, the system comprising: a set value locking recovery module, a set value module, a PID regulator module and a valve manual operator module; wherein an overrun signal is led to a tracking mode pin of the valve manual operator module, the tracking value pin is connected to a 100% constant, and is used as a valve full-open instruction signal in the tracking mode, and the overrun control function is equivalently preserved; after the overrun control function is actuated, it can automatically return to the manual automatic state before the actuation, thereby reducing the burden on the operator; the set value locking recovery module is used for adjusting the set value at the moment of self-locking when the overrun opening signal is triggered, and releasing it again to the adjustment set value before the overrun opening signal is triggered when the overrun signal disappears, so that after the overrun control function is actuated, it can automatically return to the adjustment set value before the actuation, return to normal control, and reduce the burden on the operator.

Description

Technical Field

[0001] The present application belongs to the technical field of pneumatic control valves for nuclear power plants, and in particular relates to a control system for an overdrive function of a pneumatic control valve. Background Art

[0002] Many pneumatic control valves on the conventional island side of a nuclear power plant have override control functions. The initial valve override logic configuration strategy in the override function control algorithm currently used results in the pneumatic control valve switching from automatic to manual mode whenever an override control signal appears, requiring the operator to re-activate the pneumatic control valve. When these pneumatic control valves are overloaded, it is usually during unit transients, when the operator is very busy, and manually re-activating these pneumatic control valves to automatic mode does not meet the operator's needs. Summary of the invention

[0003] The purpose of this application is to provide a control system for the override function of a pneumatic control valve, which solves the problem that whenever an override control signal appears, the pneumatic control valve switches from the automatic state to the manual state, and the operator needs to put the pneumatic control valve back into the automatic state, which cannot meet the needs of the operator. On the basis of realizing the override control function, when the override signal disappears, the valve returns to the manual automatic state before the override signal is triggered, and returns to the normal adjustment setting value before the override, thereby reducing the burden on the operator.

[0004] Technical solution to achieve the purpose of this application:

[0005] The present application provides a control system for an overdrive function of a pneumatic control valve, the system comprising: a set value lock recovery module, a set value module, a PID regulator module and a valve manual operator module;

[0006] The set value lock recovery module is used to send the output value of the set value module at the previous moment as output to the tracking value pin of the set value module when the override signal is triggered; and is also used to send the valve signal measured on site as output to the tracking value pin of the set value module after a preset time period when the override signal is restored from being triggered to not being triggered;

[0007] The set value module is used to provide a regulation target value for the PID regulator module according to the working mode of the valve operator module, the output value of the set value lock recovery module and the constant value of the external set value pin;

[0008] The tracking value pin of the PID regulator module receives the output value signal from the valve manipulator module, and the process value pin receives the valve signal, and is used to provide automatic adjustment instructions for the valve manipulator module according to the working mode of the valve manipulator module and the adjustment target value, the output value signal of the valve manipulator module and the valve signal;

[0009] The tracking mode pin of the valve operator module is connected to the override signal, and the tracking value pin is connected to the valve override control signal, so as to realize the control of the valve; when the override signal does not trigger the valve operator module to be in manual mode, the valve opening instruction manually set by the operator is output to the valve; when the override signal is triggered, the valve operator module operates in the tracking mode and outputs the valve override control signal to the valve; when the override signal is restored from being triggered to not being triggered, the valve operator module is restored to the automatic mode or the manual mode.

[0010] Optional,

[0011] The set value lock recovery module is also used to send the valve signal measured on site as output to the tracking value pin of the set value module when the override signal is not triggered.

[0012] Optional,

[0013] The set value module is also used to send the input value of the tracking value pin of the set value module as the adjustment target value to the set value pin of the PID regulator module when the valve hand operator module is in tracking mode; when the valve hand operator module is in automatic mode, send the constant value manually set by the operator or the external set value pin as the adjustment target value to the set value pin of the PID regulator module.

[0014] Optional,

[0015] The PID regulator module is also used to, when the valve manipulator module is in tracking mode, send the adjustment target value as the automatic adjustment instruction to the automatic instruction pin of the valve manipulator module; when the valve manipulator module is in automatic mode, calculate the automatic adjustment instruction based on the deviation between the adjustment target value and the valve signal and send it to the automatic instruction pin of the valve manipulator.

[0016] Optionally, the preset time period is 1 second.

[0017] Optional,

[0018] The override signal is an override on signal or an override off signal.

[0019] Optionally, when the override signal is an override open signal, the valve override control signal is a valve fully open command signal; when the override signal is an override close signal, the valve override control signal is a valve fully close command signal.

[0020] The beneficial technical effects of this application are:

[0021] After simulation tests and actual tests with valves, the present application provides a control system for the overrun function of a pneumatic control valve, which solves the shortcomings of the prior art described above and has the following significant effects:

[0022] 1) The override signal is led to the tracking mode pin of the valve operator module, and the tracking value pin is connected to a 100% constant as the valve full-open command signal in the tracking mode, which is equivalent to preserving the override control function; after the override control function is activated, it can automatically return to the manual automatic state before the action, reducing the burden on the operator;

[0023] 2) The set value lock recovery module is used to self-lock the adjustment set value at the moment when the override open signal is triggered. When the override signal disappears, it will be released back to the adjustment set value before the override open signal is triggered. After the override control function is activated, it can automatically return to the adjustment set value before the action, return to normal control, and reduce the burden on the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a control system for an overdrive function of a pneumatic control valve provided in the prior art;

[0025] Figure 2 A schematic diagram of the structure of a control system for an overriding function of a pneumatic control valve provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make those skilled in the art better understand the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, not all. Based on the embodiments recorded in the present application, all other embodiments obtained by those skilled in the art without paying creative work are within the scope of protection of the present application.

[0027] The control system for the pneumatic control valve override function in the prior art is as follows Figure 1 As shown in the figure, the set value module 10, the PID regulator module 20 and the valve operator module 30 involved in the figure are powerful and complex. Only the algorithms related to this application are described as follows:

[0028] Setting value module 10 description:

[0029] The set value module 10 is the human-machine interface between the operator and the control logic. It has two modes: automatic and tracking. In the automatic mode, the operator can choose two ways to set the set value. First, when the operator setting mode is selected, the set value comes from the operator's manual setting; second, when the logic setting mode is selected, the set value comes from a constant connected to the "external set value" pin. No matter which mode is used, the PID regulator module 20 is provided with the adjustment target value.

[0030] 1) Automatic mode, that is, when the "auto / tracking" pin is 1, it depends on whether the valve operator module 30 is put into automatic mode. When the valve operator module 30 is successfully put into automatic mode, the set value module 10 is synchronously switched to the automatic mode. In this mode, according to the set value setting method selected by the operator, the "output value" pin of the set value module 10 is the operator's manual set value or the constant of the "external set value" pin;

[0031] 2) Tracking mode, that is, when the "Auto / Tracking" pin is 0, it also depends on whether the valve operator module 3 is in automatic mode. When the valve operator module 30 successfully exits automatic mode, the set value module 10 switches to the tracking mode synchronously, and the "Output Value" pin is the signal value connected to the "Tracking Value" pin.

[0032] Valve Operator Module 30 Description:

[0033] The valve operator module 30 is the human-machine interface between the operator and the control logic. It has several working modes, such as manual, automatic, protection open, protection close, and tracking, and can control the valve in various modes. When used together with the set value module 10 and the PID adjustment module 20, the working mode and state of the valve operator module 30 determine the working mode of the set value module 10 and the PID adjustment module 20.

[0034] 1) Manual mode: no automatic command is received, and the operator can input the valve opening command according to his own will. In this mode, the "protection open" and "protection close" pin signals are 0, the "tracking mode" pin signal is 0, the "automatic command" pin signal is shielded, and the "output value" pin is the valve opening command manually set by the operator;

[0035] 2) Automatic mode: does not receive manual instructions from the operator, but receives instructions from the PID adjustment module 20 as valve opening instructions. In this mode, the "protection on" and "protection off" pin signals are 0, the "tracking mode" pin signal is 0, and the "output value" pin is the signal from the "automatic instruction" pin;

[0036] 3) The priority of the protection open mode is higher than the automatic mode and the manual mode. Once the protection open signal is received, the valve will be fully opened immediately and the valve will be forced to switch to manual mode. The protection close mode is the same as the protection open mode. The protection open and protection close modes are often connected to the override signal to realize the rapid full opening or full closing of the valve;

[0037] 4) The "automatic state" pin of the valve operator module 30. When the valve operator module 30 is in the automatic state, the "automatic state" pin is 1; when the valve operator module 30 is in the manual state, the "automatic state" pin is 0; when the "tracking mode" pin of the valve operator module 3 is 1, the "automatic state" pin is 0.

[0038] PID regulator module 20 description:

[0039] The PID regulator module 20 is a closed-loop control module, which has two working modes: automatic and tracking. It is generally used in conjunction with the set value module 10 and the valve operator module 30, receives the adjustment target value output from the set value module 10, and provides automatic adjustment instructions for the valve operator module 30.

[0040] 1) "Auto / tracking" pin, when it is 1, the module works in automatic mode, and performs conventional PID adjustment according to the deviation value of the "set value" and "process value" pins, and the calculation result is output at the "output value" pin;

[0041] 2) "Auto / tracking" pin, when it is 0, the module works in tracking mode, and the output of the "output value" pin is the signal value connected to the "tracking value" pin.

[0042] Combined with the description of the above modules, analyze the attached Figure 1 The existing control logic, its control principle is that when the valve operator module 30 is put into automatic operation, the set value module 10 provides the PID adjustment module 20 with the adjustment target value according to the mode, and the PID module 20 compares the target value with the actual measured signal on site, performs conventional PID calculation according to the deviation, and then provides the calculation result to the valve operator module 30 for the required automatic instructions. The overrun open signal is directly connected to the protection open pin of the valve operator module 30, and uses its highest level priority to quickly open the valve when the overrun open signal is triggered. Functionally, automatic adjustment and overrun control can be realized, but the inventor of this application found that it has two major disadvantages in the research:

[0043] 1) When the override open signal is triggered to "1", since it is connected to the protection open pin of the valve operator module 30, although the valve will be fully opened directly, the valve operator module 30 will also be forced to switch to manual at the same time.

[0044] 2) When the override signal is triggered to "1", the "automatic state" pin of the valve operator module 30 is 0. Since it is connected to the "automatic / tracking" of the set value module, the "output value" pin of the set value module 10 outputs the actual value of the process variable from the "tracking value" pin. It is impossible to achieve "When the override signal disappears to "0", the valve cannot return to the automatic state before the override signal is triggered, and cannot return to the normal adjustment set value before the override.

[0045] In response to these two shortcomings, an embodiment of the present application provides a control system for the override function of a pneumatic control valve, in which the configuration of the override open signal is changed from the "protection open" pin to the override signal leading to the "tracking mode" pin, and the "tracking value" pin is connected to a 100% constant as a valve full-open command signal in the tracking mode; a set value lock recovery unit is added to self-lock the adjustment set value at the moment when the override open signal is triggered, and release it back to the adjustment set value before the override signal is triggered when the override signal disappears, thereby solving the technical problems existing in the above-mentioned prior art.

[0046] Based on the above content, in order to clearly and in detail illustrate the above advantages of the present application, the specific implementation methods of the present application will be described below in conjunction with the accompanying drawings.

[0047] See also Figure 2 , which is a structural schematic diagram of a control system for an overdrive function of a pneumatic control valve provided in an embodiment of the present application.

[0048] A control system for an overrun function of a pneumatic control valve provided in an embodiment of the present application includes: a set value lock recovery module 100, a set value module 200, a PID regulator module 300 and a valve manual operator module 400;

[0049] The set value lock recovery module 100 is used to send the output value of the set value module 200 at the previous moment as an output to the tracking value pin of the set value module 200 when the override signal is triggered; and is also used to send the valve signal measured on site as an output to the tracking value pin of the set value module 200 after a preset time period when the override signal is restored from being triggered to not being triggered;

[0050] The set value module 200 is used to provide a regulation target value for the PID regulator module 300 according to the working mode of the valve operator module 400, the output value of the set value lock recovery module 100 and the constant value of the external set value pin;

[0051] The tracking value pin of the PID regulator module 300 receives the output value signal from the valve operator module 400, and the process value pin receives the valve signal, and is used to provide automatic adjustment instructions for the valve operator module 400 according to the working mode of the valve operator module 400 and the adjustment target value, the output value signal of the valve operator module 400 and the valve signal;

[0052] The tracking mode pin of the valve operator module 400 is connected to the override signal, and the tracking value pin is connected to the valve override control signal, so as to realize the control of the valve 500; when the override signal does not trigger the valve operator module 400 to be in manual mode, the valve opening instruction manually set by the operator is output to the valve 500; when the override signal is triggered, the valve operator module 400 operates in the tracking mode and outputs the valve override control signal to the valve 500; when the override signal is restored from being triggered to not being triggered, the valve operator module 500 is restored to the automatic mode or the manual mode.

[0053] In the embodiment of the present application, when the override signal is triggered, the valve operator module 400 works in the tracking mode, and the tracking mode has a higher priority than the manual mode and the automatic mode, and is lower than the protection open and protection close. In this mode, the valve opening instruction is the signal value of the "tracking value" pin. When the "tracking mode" pin signal changes from 0 to 1, the "output value" pin outputs the signal from the "tracking value" pin; when the "tracking mode" pin signal changes from 1 to 0, the valve operator module 400 returns to the manual and automatic state before the tracking mode, realizing that when the override signal disappears and becomes 0, the valve returns to the automatic state before the override signal is triggered.

[0054] It should also be noted that when the override signal is restored from being triggered to being untriggered, the set value lock recovery module 100, after a delay of a preset time period, sends the valve signal actually measured on site as an output to the tracking value pin of the set value module 200, self-locks at this moment to adjust the set value, and when the override signal disappears, it will be released again to return to the adjustment set value before the override signal is triggered, thereby solving the problem of being unable to return to the normal adjustment set value before the override.

[0055] In a specific implementation, the preset time period may be 1 second.

[0056] As an example, the override signal may be an override open signal or an override close signal. For example, when the override signal is an override open signal, the valve override control signal may be a valve fully open command signal; when the override signal is an override close signal, the valve override control signal may be a valve fully close command signal.

[0057] In some possible implementations of the embodiments of the present application, the set value lock recovery module 100 is also used to send the valve signal measured on site as an output to the tracking value pin of the set value module 200 when the override signal is not triggered.

[0058] In some possible implementations of the embodiments of the present application, the set value module 200 is also used to send the input value of the tracking value pin of the set value module 200 as the adjustment target value to the set value pin of the PID regulator module 300 when the valve manipulator module 400 is in the tracking mode; when the valve manipulator module 400 is in the automatic mode, send the constant value manually set by the operator or the external set value pin as the adjustment target value to the set value pin of the PID regulator module 300.

[0059] In some possible implementations of the embodiments of the present application, the PID regulator module 300 is also used to send the adjustment target value as an automatic adjustment instruction to the automatic instruction pin of the valve manipulator module 400 when the valve manipulator module 400 is in the tracking mode; when the valve manipulator module 400 is in the automatic mode, the automatic adjustment instruction is calculated according to the deviation between the adjustment target value and the valve signal and sent to the automatic instruction pin of the valve manipulator module 400.

[0060] In conjunction with a specific example, taking the override signal as an override open signal as an example, the specific working principle of a control system for an override function of a pneumatic control valve provided in an embodiment of the present application is described in detail.

[0061] according to Figure 2 The schematic diagram is implemented and the specific situation of signal transmission is described in two cases:

[0062] Case 1: The valve is working in manual mode, and the override open signal does not trigger the transition trigger and then recover.

[0063] Case 1.1: The valve is operating in manual mode and the override open signal is not triggered.

[0064] Step 1: Since the valve operator module 40 is in manual mode and the override open signal is 0, the output value is the valve opening instruction manually set by the operator, and the output value is sent to the local actual device and also to the "tracking value" pin of the PID regulator 300. At this time, the "automatic state" pin signal is 0, which is sent to the "automatic / tracking" pin of the set value module 200 and the "automatic / tracking" pin of the PID regulator 300.

[0065] Step 2: Since the override open signal is 0, the input (i.e., the field measured signal) selected by the selection switch in the set value lock recovery module 100 is sent as output to the "tracking value" pin of the set value module 200.

[0066] Step 3: The “auto / tracking” pin of the set value module 200 receives the “auto status” pin signal of 0 from the valve operator module 400, and the “tracking value” pin of the set value module 200 receives the output value signal from the selection switch of the set value lock recovery module 100. The set value module 200 is in tracking mode, and the output value is the signal value of the “tracking value” pin of the set value module 200 (i.e., the field measured signal), and the output value is sent to the “set value” pin of the PID regulator module 300.

[0067] Step 4: The "Auto / Tracking" pin of the PID regulator module 300 receives the "Auto Status" pin signal 0 from the valve operator module 400, and the "Tracking Value" pin of the PID regulator receives the output value signal from the valve operator. The PID regulator module 300 is in tracking mode, and the output value is the signal value of the "Tracking Value" pin of the PID regulator module 300 (i.e., the valve opening instruction manually set by the operator), and the output value is sent to the "Auto Instruction" pin of the valve operator module 400.

[0068] Step 5: The “automatic command” pin of the valve operator module 400 receives the output value from the PID regulator module 300, but since the valve is in manual mode, this input signal has no effect.

[0069] Case 1.2: The valve is operating in manual mode and the override open signal changes from untriggered to triggered.

[0070] Step 6: When the overrun open signal changes from 0 to 1, the "tracking mode" pin of the valve operator module 400 is 1, and the valve operator module 400 enters the tracking mode, and the output value is 100% of the signal of the "tracking value" pin. At this time, the "automatic state" pin signal is 0, which is sent to the "automatic / tracking" pin of the set value module 200 and the "automatic / tracking" pin of the PID regulator module 300.

[0071] Step 7: The override open signal changes from 0 to 1, and the selection switch in the set value lock recovery module 100 selects the input of "yes" (i.e. the output value of the set value module at the previous moment) as the output and is sent to the "tracking value" pin of the set value module.

[0072] Step 8: The “auto / tracking” pin of the set value module 200 receives the “auto status” pin signal of 0 from the valve operator door module 400, and the “tracking value” pin of the set value module 200 receives the output value signal from the selection switch of the set value lock recovery module 100. The set value module 200 is in tracking mode, and the output value is the signal value of the “tracking value” pin of the set value module 200 (i.e., the output value of the set value module at the previous moment is maintained), and the output value is sent to the “set value” pin of the PID regulator module 300.

[0073] Step 9: The “Automatic / Tracking” pin of the PID regulator module 300 receives a signal of 0 from the “Automatic State” pin of the valve operator module 400, and the “Tracking Value” pin of the PID regulator module 300 receives an output value signal from the valve operator module 400. The PID regulator module 300 is in tracking mode, and the output value is the signal value of the “Tracking Value” pin of the PID regulator module 300 (i.e., 100%), and the output value is sent to the “Automatic Instruction” pin of the valve operator module 400.

[0074] Step 10: The “automatic command” pin of the valve operator module 400 receives the output value from the PID regulator module 300, but since the valve is in tracking mode, this input signal has no effect, and the valve opening command manually set by the operator is also rewritten to 100%.

[0075] Case 1.3: The valve is operating in manual mode, and the override open signal is restored from triggered to not triggered.

[0076] Step 11: When the override open signal changes from 1 to 0, the "tracking mode" pin of the valve operator module 400 changes from 1 to 0, and the valve operator module 400 changes from tracking mode to manual mode, and the output value changes from the signal of the "tracking value" pin to the opening instruction manually set by the operator (i.e. 100%, which has been rewritten in step 10). At this time, the "automatic state" pin signal is 0, which is sent to the "automatic / tracking" pin of the set value module 200 and the "automatic / tracking" pin of the PID regulator module 300.

[0077] Step 12: The override open signal changes from 1 to 0, and the input (i.e., the field measured signal) of the selection switch that selects "No" is delayed for 1 second in the set value lock recovery module 100 and is sent as output to the tracking value pin of the set value module 200.

[0078] Step 13: The “auto / tracking” pin of the set value module 200 receives the “auto status” pin signal of 0 from the valve operator module 400, and the “tracking value” pin of the set value module 200 receives the output value signal from the selection switch of the set value lock recovery module 100. The set value module 200 is in tracking mode, and the output value is the signal value of the “tracking value” pin of the set value module 200 (i.e., the field measured signal), and the output value is sent to the “set value” pin of the PID regulator module 300.

[0079] Step 14: The “Automatic / Tracking” pin of the PID regulator module 300 receives a signal of 0 from the “Automatic State” pin of the valve operator module 400, and the “Tracking Value” pin of the PID regulator module 300 receives an output value signal from the valve operator module 400. The PID regulator module 300 is in tracking mode, and the output value is the signal value of the “Tracking Value” pin of the PID regulator module 300 (i.e., 100%), and the output value is sent to the “Automatic Instruction” pin of the valve operator module 400.

[0080] Step 15: The “automatic command” pin of the valve operator module 400 receives the output value from the PID regulator module 300, but since the valve is in manual mode, this input signal has no effect.

[0081] Case 2: The valve works in automatic mode, and the override open signal does not trigger the transition trigger and then recovery.

[0082] Case 2.1: The valve operates in automatic mode and the override open signal is not triggered.

[0083] Step 1: Since the valve operator module 400 is in automatic mode and the override open signal is 0, the output value is the signal value of the "automatic instruction" pin, and the output value is sent to the local actual device and also to the "tracking value" pin of the PID regulator module 300. At this time, the "automatic state" pin signal is 1, which is sent to the "automatic / tracking" pin of the set value module 200 and the "automatic / tracking" pin of the PID regulator module 300.

[0084] Step 2: Since the override open signal is 0, the input (i.e., the field measured signal) selected by the selection switch in the set value lock recovery module 100 is sent as output to the "tracking value" pin of the set value module 200.

[0085] Step 3: The "auto / tracking" pin of the set value module 200 receives the "auto status" pin signal of 1 from the valve operator module 400, and the "tracking value" pin of the set value module 200 receives the output value signal from the selection switch of the set value lock recovery module 100, but the set value module 200 is in automatic mode and this signal does not work. The set value module 200 is in automatic mode, and the output value is the constant value manually set by the operator or the external set value pin, and the output value is sent to the "set value" pin of the PID regulator module 300.

[0086] Step 4: The "Auto / Tracking" pin of the PID regulator module 300 receives the "Auto Status" pin signal of 1 from the valve operator module 400, and the PID regulator module 300 also works in the automatic mode. The "Set Value" pin of the PID regulator module 300 receives the output value signal from the set value module 200, and the "Process Quantity" pin receives the field measured signal. According to the deviation between the "Set Value" and the "Process Quantity", the PID regulator module 300 calculates the automatic control instruction as the output value, and sends the output value to the "Auto Instruction" pin of the valve operator module 400. When the PID regulator module 300 is in the automatic mode, the tracking value does not work.

[0087] Step 5: The "automatic command" pin of the valve operator module 400 receives the output value from the PID regulator module 300, and the output value is the signal value of the "automatic command" pin. The valve is in automatic mode, the "tracking value" pin signal does not work, and the operator cannot manually input the valve opening command signal.

[0088] Case 2.2: The valve is operating in automatic mode and the override open signal changes from untriggered to triggered.

[0089] Step 6: When the overrun open signal changes from 0 to 1, the "tracking mode" pin of the valve operator module 400 changes from 0 to 1, and the valve operator module 400 enters the tracking mode, and the output value is 100% of the signal of the "tracking value" pin. At this time, the "automatic state" pin signal changes from 1 to 0 and is sent to the "automatic / tracking" pin of the set value module 200 and the "automatic / tracking" pin of the PID regulator module 300.

[0090] Step 7: The override open signal changes from 0 to 1, and the selection switch in the set value lock recovery module 100 selects the input of "yes" (i.e. the output value of the set value module at the previous moment) as the output and is sent to the "tracking value" pin of the set value module 200.

[0091] Step 8: The “auto / tracking” pin of the set value module 200 receives the “auto status” pin signal from the valve operator module 400 and changes from 1 to 0, and the “tracking value” pin of the set value module 200 receives the output value signal from the selection switch of the set value lock recovery module 100. The set value module 200 is in tracking mode, and the output value is the signal value of the “tracking value” pin of the set value module 200 (i.e., the output value of the set value module at the previous moment is maintained), and the output value is sent to the “set value” pin of the PID regulator module 300.

[0092] Step 9: The “auto / tracking” pin of the PID regulator module 300 receives the “auto status” pin signal from the valve operator module 400 and changes from 1 to 0, and the “tracking value” pin of the PID regulator module 300 receives the output value signal from the valve operator module 400. The PID regulator module 300 changes from the automatic mode to the tracking mode, and the output value is calculated by the PID regulator module 300 to convert the automatic control command to the signal value of the “tracking value” pin of the PID regulator module 300 (i.e. 100%), and the output value is sent to the “auto command” pin of the valve operator module 400.

[0093] Step 10: The “automatic command” pin of the valve operator module 400 receives the output value from the PID regulator module 300, but since the valve is in tracking mode, this input signal has no effect.

[0094] Case 2.3: The valve operates in automatic mode, and the override open signal returns from triggered to untriggered.

[0095] Step 11: When the override open signal changes from 1 to 0, the "tracking mode" pin of the valve operator module 400 changes from 1 to 0, and the valve operator module 400 changes from tracking mode to automatic mode, and the output value changes from the signal of the "tracking value" pin to the opening instruction set manually by the operator (i.e. 100%, which has been changed in step 9). At this time, the automatic state signal changes from 0 to 1 and is sent to the "automatic / tracking" pin of the set value module 200 and the "automatic / tracking" pin of the PID regulator module 300.

[0096] Step 12: The override open signal changes from 1 to 0, and the input (i.e., the process quantity) of the selection switch in the set value lock recovery module 100 that selects "No" is sent as output to the "tracking value" pin of the set value module 200.

[0097] Step 13: The “auto / tracking” pin of the set value module 200 receives the “auto status” pin signal from the valve operator module 400 and changes from 0 to 1, and the “tracking value” pin of the set value module 200 receives the output value signal from the selection switch of the set value lock recovery module 100. The set value module 200 is in automatic mode, and the output value is the constant value manually set by the operator or the external set value pin, and the output value is sent to the set value pin of the PID regulator module 300.

[0098] Step 14: The "auto / tracking" pin of the PID regulator module 300 receives the "auto status" pin signal from the valve operator module 400 and changes from 0 to 1, and the "tracking value" pin of the PID regulator module 300 receives the output value signal from the valve operator module 400. The PID regulator module 300 changes from the tracking mode to the automatic mode, and the PID regulator module 300 calculates the automatic control command as the output value according to the deviation between the set value and the process value, and sends the output value to the automatic command pin of the valve operator module 400.

[0099] Step 15: The “automatic instruction” pin of the valve operator module 400 receives the output value from the PID regulator module 300 and sends it to the local actual device and also to the “tracking value” pin of the PID regulator module 300.

[0100] The above description is explained using the override open signal as an example. The valve control of the override close signal is similar to the principle of this method and will not be repeated here.

[0101] The present application is described in detail above in conjunction with the accompanying drawings and embodiments, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present application. Any content not described in detail in the present application can adopt the existing technology.

Claims

1. A control system for an overriding function of a pneumatic regulating valve, characterized in that: The system comprises: a set value locking recovery module, a set value module, a PID regulator module and a valve manual operator module; The set value lock recovery module is used to send the output value of the set value module at the previous moment as output to the tracking value pin of the set value module when the override signal is triggered; and is also used to send the valve signal measured on site as output to the tracking value pin of the set value module after a preset time period when the override signal is restored from being triggered to not being triggered; The set value module is used to provide a regulation target value for the PID regulator module according to the working mode of the valve operator module, the output value of the set value lock recovery module and the constant value of the external set value pin; The tracking value pin of the PID regulator module receives the output value signal from the valve manipulator module, and the process value pin receives the valve signal, and is used to provide automatic adjustment instructions for the valve manipulator module according to the working mode of the valve manipulator module and the adjustment target value, the output value signal of the valve manipulator module and the valve signal; The tracking mode pin of the valve operator module is connected to the override signal, and the tracking value pin is connected to the valve override control signal, so as to realize the control of the valve; when the override signal does not trigger the valve operator module to be in manual mode, the valve opening instruction manually set by the operator is output to the valve; when the override signal is triggered, the valve operator module operates in the tracking mode and outputs the valve override control signal to the valve; when the override signal is restored from being triggered to not being triggered, the valve operator module is restored to the automatic mode or the manual mode.

2. The control system for the pneumatic control valve override function according to claim 1, characterized in that: The set value lock recovery module is also used to send the valve signal measured on site as output to the tracking value pin of the set value module when the override signal is not triggered.

3. The control system for the pneumatic control valve override function according to claim 1, characterized in that: The set value module is also used to send the input value of the tracking value pin of the set value module as the adjustment target value to the set value pin of the PID regulator module when the valve hand operator module is in tracking mode; when the valve hand operator module is in automatic mode, send the constant value manually set by the operator or the external set value pin as the adjustment target value to the set value pin of the PID regulator module.

4. The control system for the pneumatic control valve override function according to claim 1, characterized in that: The PID regulator module is also used to, when the valve manipulator module is in tracking mode, send the adjustment target value as the automatic adjustment instruction to the automatic instruction pin of the valve manipulator module; when the valve manipulator module is in automatic mode, calculate the automatic adjustment instruction based on the deviation between the adjustment target value and the valve signal and send it to the automatic instruction pin of the valve manipulator module.

5. The control system for the pneumatic control valve override function according to any one of claims 1 to 4, characterized in that: The preset time period is 1 second.

6. A control system for an overriding function of a pneumatic regulating valve according to any one of claims 1 to 4, characterized in that: The override signal is an override on signal or an override off signal.

7. The control system for the pneumatic control valve override function according to claim 6, characterized in that: When the override signal is an override open signal, the valve override control signal is a valve fully open command signal; when the override signal is an override close signal, the valve override control signal is a valve fully close command signal.

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