A Processing Method for the Abnormal Fault of Valve Position Feedback Caused by Power Loss of an Intelligent Electric Valve

Abstract

The present invention belongs to the technical field of electric valve fault handling, and particularly relates to a method for handling the fault of abnormal valve position feedback caused by power loss of an intelligent electric valve. The present invention includes the following steps: when the electric valve loses power, the logic of the power loss state judgment unit of the electric valve judges whether to trigger memory; if memory is triggered, the valve position feedback signal memory unit of the electric valve memorizes the valve position feedback signal 0.2 seconds before the current valve position and outputs it as the valve position feedback signal for logical operation; if memory is not triggered, the valve position feedback signal memory unit outputs the actual valve position feedback signal as the valve position feedback signal for logical operation. The present invention can solve the problem of abnormal state feedback after the intelligent electric valve loses power, ensure that the valve state display on the main control screen is correct, the system equipment control logic can be normally executed, and improve the safety and stability of unit operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric valve fault handling, and particularly relates to a method for handling the fault of abnormal valve position feedback caused by power failure of an intelligent electric valve. Background Technique

[0002] With the rapid development of electronic industrial technology and the gradual improvement of the digitalization, networking, and intelligentization levels of the manufacturing industry, intelligent electric drive devices have been widely used in various industries due to their excellent performance in terms of control flexibility and reliability. In the conventional island system of a certain unit, there are 173 intelligent electric drive devices (referred to as electric valves) controlled by the conventional island distributed control system for each unit. During the engineering commissioning stage, the commissioning personnel found that after the power failure of the device, the full-open and full-closed state feedbacks of 104 intelligent electric valves that use travel encoders to trigger feedback signals showed "0" in the DCS, resulting in the main control operator being unable to understand the actual valve position of the on-site electric valves. At the same time, since the valve position state feedback of some of these intelligent electric valves participates in the logic control of important equipment and systems, if not solved, there are risks such as reactor protection shutdown, turbine generator trip, and reactor over-power operation. After consulting other power plants, it was found that similar problems also exist, but no corresponding solutions have been found.

[0003] The formation of the full-open / full-closed feedback signal of this type of intelligent electric valve is mainly divided into three processes: signal acquisition, processing, and output. During the valve opening and closing process, the travel encoder collects the number of revolutions of the planetary gear, outputs a group of high-frequency pulse signals to the control main board, and then the main board performs signal conversion to achieve functions such as valve opening display and switch control, and drives the full-open / full-closed feedback signal relay to act. When the relay coil is energized, its normally open auxiliary contact closes, and the full-open / full-closed feedback signal is output. Therefore, when the electric valve loses power, the relay also loses power, and at this time, both the full-open and full-closed feedback signals are disconnected, and a double-zero fault will be displayed remotely.

[0004] To solve this problem, if traditional methods are adopted, such as:

[0005] 1. Replace the main board that can meet the control requirements. The manufacturer does not have this type of main board available for direct replacement and needs to be redesigned and produced;

[0006] 2. On the existing main board, replace the type of feedback relay, re-weld, etch, and modify the control circuit of the main control.

[0007] Whichever method requires a large amount of time and capital investment and cannot solve the problem quickly.

[0008] Therefore, it is necessary to deeply analyze the reasons for the abnormal valve position feedback after the power failure of this type of intelligent electric valve, and based on the analysis results, formulate an efficient solution to ensure the safe and stable operation of the unit. Summary of the Invention

[0009] The object of the present invention is to provide a method for dealing with the abnormal valve position feedback fault caused by the power failure of an intelligent electric valve, which can solve the problem of abnormal state feedback after the power failure of the intelligent electric valve, ensure that the valve state display on the main control screen is correct, the system equipment control logic can be normally executed, and improve the safety and stability of the unit operation.

[0010] The technical solution adopted by the present invention:

[0011] A method for dealing with the abnormal valve position feedback fault caused by the power failure of an intelligent electric valve includes the following steps: when the electric valve loses power, the logic of the power failure state judgment unit of the electric valve judges whether to trigger memory; if memory is triggered, the valve position feedback signal memory unit of the electric valve memorizes the valve position feedback signal 0.2 seconds before the current valve position and outputs it as the valve position feedback signal for logical operation; if memory is not triggered, the valve position feedback signal memory unit outputs the actual valve position feedback signal as the valve position feedback signal for logical operation.

[0012] The power failure of the electric valve is used to characterize that all the actual open feedback signal, actual close feedback signal and valve fault signal of the valve indicating the power failure state are all changed within 0.2 seconds.

[0013] In the power failure state judgment unit of the electric valve, when the valve is in the normal fully open state, the actual open feedback signal of the valve is 1, which is changed to 0 after passing through the NOT gate and output to the AND gate; the actual close feedback signal of the valve is 0, which is changed to 1 after passing through the NOT gate and output to the AND gate; the valve fault signal is 0, and the output after passing through the close delay module is still 0 to the AND gate. If the three input conditions are not all 1, the output of the AND gate is 0, and the valve power failure state signal is not triggered.

[0014] If the valve loses power at this time, the actual open feedback signal of the valve changes from 1 to 0, which is changed to 1 after passing through the NOT gate and output to the AND gate; the actual close feedback signal of the valve is 0 and does not change, which is changed to 1 after passing through the NOT gate and output to the AND gate; the valve fault signal changes from 0 to 1, passes through the close delay module, but the signal change of the close delay module from 0 to 1 is not delayed, and the output of the delay module is 1 to the AND gate. If the three input conditions are all 1, the output of the AND gate is 1, and the valve power failure state signal is generated.

[0015] If the valve changes from power failure to re-power at this time, the actual open feedback signal of the valve returns from 0 to 1, which is changed to 0 after passing through the NOT gate and output to the AND gate; the actual close feedback signal of the valve is 0 and does not change, which is changed to 1 after passing through the NOT gate and output to the AND gate; the valve fault signal changes from 1 to 0, and after passing through the close delay module and delaying for X seconds, the output is 0 to the AND gate. If the three input conditions are not all 1, the output of the AND gate changes from 1 to 0, and the valve power failure state signal disappears.

[0016] In the power-off state judgment unit of the electric valve, when the valve is in the normal fully closed state, the actual open feedback signal of the valve is 0, which is converted to 1 after passing through the NOT gate and output to the AND gate; the actual closed feedback signal of the valve is 1, which is converted to 0 after passing through the NOT gate and output to the AND gate; the valve fault signal is 0, and the output after passing through the close delay module is still 0 to the AND gate. If the three input conditions are not all 1, the output of the AND gate is 0, and the valve power-off state signal is not triggered.

[0017] If the valve loses power at this time, the actual open feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the actual closed feedback signal of the valve changes from 1 to 0, and after passing through the NOT gate, it is converted to 1 and output to the AND gate; the valve fault signal changes from 0 to 1. After passing through the close delay module, but the signal change from 0 to 1 of the delay module is not delayed, and the output of the delay module is 1 to the AND gate. If the three input conditions are all 1, the output of the AND gate is 1, and the valve power-off state signal is generated.

[0018] If the valve changes from power-off to re-powered at this time, the actual open feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the actual closed feedback signal of the valve changes from 0 back to 1, and after passing through the NOT gate, it is converted to 0 and output to the AND gate; the valve fault signal changes from 1 to 0. After passing through the close delay module and delaying for X seconds, the output is 0 to the AND gate. If the three input conditions are not all 1, the output of the AND gate changes from 1 to 0, and the valve power-off state signal disappears.

[0019] In the power-off state judgment unit of the electric valve, when the valve is in the normal intermediate state, the actual open feedback signal of the valve is 0, and the signal output to the AND gate after passing through the NOT gate is 1. The actual closed feedback signal of the valve is 0, and the signal output to the AND gate after passing through the NOT gate is 1. The valve fault signal is 0, and the signal output to the AND gate after passing through the close delay module is 0. The output of the AND gate is 0, and the valve power-off state signal is not triggered.

[0020] If the valve loses power at this time, the actual open feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the actual closed feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the valve fault signal changes from 0 to 1. After passing through the close delay module, but the signal change from 0 to 1 of the delay module is not delayed, and the output of the delay module is 1 to the AND gate. If the three input conditions are all 1, the output of the AND gate is 1, and the valve power-off state signal is generated.

[0021] If the valve changes from power-off to re-powered at this time, the actual open feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the actual closed feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the valve fault signal changes from 1 to 0. After passing through the close delay module and delaying for X seconds, the output is 0 to the AND gate. If the three input conditions are not all 1, the output of the AND gate changes from 1 to 0, and the valve power-off state signal disappears.

[0022] The delay time X of the said delay module is 1 - 5 seconds.

[0023] The electric valve feedback signal memory unit receives the valve power-off state signal from the electric valve power-off state judgment unit, and is used to control whether the electric valve feedback signal memory unit starts the memory function.

[0024] In the electric valve feedback signal memory unit, when the valve is working normally, the actual valve open feedback signal and the output of the first selection module are the two input signals of the first selection module. When the electric valve feedback signal memory unit receives the valve power-off state signal from the electric valve power-off state judgment unit as 0, the first selection module selects the actual valve open feedback signal as the output and sends it to the power-off first delay module; if there is no change in the actual valve open feedback signal from 1 to 0, the power-off first delay module does not work and directly sends the input signal as the output signal, forming the final valve open feedback signal 01; if there is a change in the actual valve open feedback signal from 1 to 0, the power-off first delay module delays the input signal by 0.2 seconds and sends it out as the output signal, forming the final valve open feedback signal 01.

[0025] When the valve is working normally, the actual valve close feedback signal and the output of the second selection module are the two input signals of the second selection module. When the electric valve feedback signal memory unit receives the valve power-off state signal from the electric valve power-off state judgment unit as 0, the second selection module selects the actual valve close feedback signal as the output and sends it to the power-off second delay module; if there is no change in the actual valve close feedback signal from 1 to 0, the power-off second delay module does not work and directly sends the input signal as the output signal, forming the final valve close feedback signal 01; if there is a change in the actual valve close feedback signal from 1 to 0, the power-off second delay module delays the input signal by 0.2 seconds and sends it out as the output signal, forming the final valve close feedback signal 01.

[0026] In the electric valve feedback signal memory unit, when the valve loses power, the actual open feedback signal and the output of the first selection module are the two input signals of the first selection module. When the electric valve feedback signal memory unit receives a valve power loss state signal of 1 from the electric valve power loss state judgment unit, the memory function of the electric valve feedback signal memory unit is triggered. The first selection module selects the output of the first selection module at the previous moment as the output of the first selection module at this moment and sends it to the power loss first close delay module. If there is no change in the actual open feedback signal of the valve from 1 to 0, the power loss first close delay module does not function and directly sends the input signal as the output signal, forming the final valve open feedback signal 01. If there is a change in the actual open feedback signal of the valve from 1 to 0, the power loss first close delay module delays the input signal by 0.2 seconds and sends it as the output signal, forming the final valve open feedback signal 01.

[0027] When the valve loses power, the actual close feedback signal and the output of the second selection module are the two input signals of the first selection module. When the electric valve feedback signal memory unit receives a valve power loss state signal of 1 from the electric valve power loss state judgment unit, the memory function of the electric valve feedback signal memory unit is triggered. The second selection module selects the output of the second selection module at the previous moment as the output of the second selection module at this moment and sends it to the power loss second close delay module. If there is no change in the actual close feedback signal of the valve from 1 to 0, the power loss second close delay module does not function and directly sends the input signal as the output signal, forming the final valve open feedback signal 01. If there is a change in the actual close feedback signal of the valve from 1 to 0, the power loss second close delay module delays the input signal by 0.2 seconds and sends it as the output signal, forming the final valve close feedback signal 01.

[0028] The delay time of the first close delay module and the second close delay module is 0.2 seconds.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] (1) A method for dealing with the abnormal valve position feedback fault caused by the power loss of an intelligent electric valve provided by the present invention, by adding two units and reasonably using the delay module, memorizes the valve position feedback signal at the moment before the power loss of the electric valve on the DCS side, and also ensures the normal recovery of the signal after the valve is re-powered, so as to meet the process control requirements and avoid the possible shutdown and reactor shutdown caused thereby.

[0031] (2) A method for dealing with the abnormal valve position feedback fault caused by the power loss of an intelligent electric valve provided by the present invention saves a large amount of material costs and labor costs required for replacing or modifying the electric head (the modification of each electric head requires 8000 RMB / set according to the manufacturer's quotation), and avoids various risks in the modification process.

[0032] (3) The processing method for the abnormal valve position feedback fault caused by power failure of the intelligent electric valve provided by the present invention saves the time required for replacing or modifying the electric actuator, and ensures the commissioning progress of the on-site unit. Description of the Drawings

[0033] Figure 1 : Flowchart of the processing method for the abnormal valve position feedback fault caused by power failure of the intelligent electric valve provided by the present invention;

[0034] Figure 2 : Schematic diagram of the power failure state judgment unit of the electric valve;

[0035] Figure 3 : Schematic diagram of the feedback signal memory unit of the electric valve. Detailed Embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Such as Figure 1As shown in the figure, a method for handling the abnormal valve position feedback fault caused by power failure of an intelligent electric valve provided by the present invention includes the following steps: when the electric valve loses power, the logic of the power failure state judgment unit (unit 1) of the electric valve judges whether to trigger memory; if memory is triggered, the valve position feedback signal memory unit (unit 2) of the electric valve memorizes the valve position feedback signal 0.2 seconds before the current valve position and outputs it as the valve position feedback signal for logic operation; if memory is not triggered, unit 2 outputs the actual valve position feedback signal as the valve position feedback signal for logic operation.

[0040] When the valve loses power, the fully open valve position feedback signal, fully closed valve position feedback signal, and valve fault signal used to represent the power failure state can all be changed within 0.2 seconds. It is necessary to use a delay module to make the fully open or fully closed feedback signal of the valve change from 1 to 0 with a 0.2-second delay. This is to prevent the valve position feedback that needs to be memorized from flipping before unit 2 receives the valve power failure state signal sent by unit 1, thus avoiding the double 0 fault.

[0041] When the valve is re-powered, the main board on the electric valve side is powered on and restarted, and the fully open, fully closed, and fault signals will be restored. If the fully open and fully closed signals are restored before the fault signal, there will be no problem of the short-term double 0 fault during the re-powering process. However, it is possible (verified) that the fault signal is restored before the fully open or fully closed signal. Therefore, according to the valve type, a X-second (1 - 5 seconds) off-delay is set for the valve fault signal in unit 1, so that the fault signal changes from 1 to 0 with a time delay, ensuring that the fully open or fully closed signal is restored before the fault signal and the valve power failure state signal disappears, and unit 2 returns from the memory function mode to the normal feedback mode, avoiding the short-term double 0 fault phenomenon during the re-powering of the electric valve.

[0042] As Figure 2 , the signal transmission of unit 1 can be divided into three types, and its principle is as follows:

[0043] 1) When the valve is in the normal fully open state, the actual open feedback signal OP of the valve is 1, which is changed to 0 after passing through the NOT gate and output to the AND gate; the fully closed feedback CP is 0, which is changed to 1 after passing through the NOT gate and output to the AND gate; the valve fault signal FP is 0, and after passing through the delay module, the output is still 0 to the AND gate. Since the three input conditions are not all 1, the output of the AND gate is 0, and the "valve power failure state" signal is not triggered. This signal is the bridge between unit 1 and unit 2: when triggered, it is used to start the memory function of unit 2; when not triggered, it releases the memory function of unit 2.

[0044] If the valve loses power at this time, the valve actual open feedback signal OP changes from 1 to 0, and changes to 1 after passing through the NOT gate and is output to the AND gate; the valve actual closed feedback signal CP is 0 and does not change, and changes to 1 after passing through the NOT gate and is output to the AND gate; the valve fault signal FP changes from 0 to 1 and passes through the closing delay module, but the closing delay module does not play a delay role when the signal changes from 0 to 1. The delay module directly outputs 1 to the AND gate. When all three input conditions are 1, the AND gate output is 1, generating a "valve power failure state" signal.

[0045] If the valve is powered on again from power failure at this time, the valve actual open feedback signal OP will recover from 0 to 1, and will be converted to 0 after passing through the NOT gate and output to the AND gate; the valve actual closed feedback signal CP will be 0 and will not be converted, and will be converted to 1 after passing through the NOT gate and output to the AND gate; the valve fault signal FP will be converted from 1 to 0, and will be output to the AND gate after a delay of X seconds by the closing delay module, and the AND gate output will be converted from 1 to 0 if the three input conditions are not all 1 (when the valve actual open feedback signal OP recovers from 0 to 1 and is inverted to 0 after passing through the NOT gate, the three input conditions of the AND gate are no longer all 1, and the output of the AND gate is converted from 1 to 0), and the "valve power failure status" signal disappears.

[0046] 2) When the valve is in the normal fully closed state, the valve actual open feedback signal OP is 0, which is converted to 1 after passing through the NOT gate and output to the AND gate; the valve actual closed feedback signal CP is 1, which is converted to 0 after passing through the NOT gate and output to the AND gate; the valve fault signal FP is 0, and after passing through the closing delay module, the output is still 0 to the AND gate. If the three input conditions are not all 1, the AND gate output is 0, and the "valve power failure state" signal will not be triggered.

[0047] If the valve loses power at this time, the valve actual open feedback signal OP is 0 and does not change. After passing through the NOT gate, it changes to 1 and is output to the AND gate; the valve actual closed feedback signal CP changes from 1 to 0, and after passing through the NOT gate, it changes to 1 and is output to the AND gate; the valve fault signal FP changes from 0 to 1 and passes through the closing delay module, but the signal transition from 0 to 1 of the closing delay module is not delayed. The closing delay module outputs 1 to the AND gate. When all three input conditions are 1, the AND gate output is 1, generating a "valve power failure status" signal.

[0048] If the valve is powered on again from power off at this time, the valve actual open feedback signal OP is 0 and does not change. It changes to 1 after passing through the NOT gate and is output to the AND gate; the valve actual closed feedback signal CP recovers from 0 to 1, changes to 0 after passing through the NOT gate and is output to the AND gate; the valve fault signal FP changes from 1 to 0, and is output to the AND gate after a delay of X seconds by the closing delay module. If the three input conditions are not complete, the AND gate output changes from 1 to 0 (when the valve actual closed feedback signal CP recovers from 0 to 1 and is inverted to 0 after passing through the NOT gate, the output of the AND gate changes from 1 to 0), and the "valve power off state" signal disappears.

[0049] 3) When the valve is in the normal intermediate state, the actual open feedback signal OP of the valve is 0. After passing through the NOT gate, the signal output to the AND gate is 1. The actual closed feedback signal CP of the valve is 0. After passing through the NOT gate, the signal output to the AND gate is 1. The valve fault signal FP is 0. After passing through the close delay module, the signal output to the AND gate is 0. The output of the AND gate is 0, and the signal of "valve power-off state" will not be triggered.

[0050] If the valve loses power at this time, the actual open feedback signal OP of the valve is 0 and does not change. After passing through the NOT gate, it changes to 1 and is output to the AND gate; the actual closed feedback signal CP of the valve is 0 and does not change. After passing through the NOT gate, it changes to 1 and is output to the AND gate; the valve fault signal FP changes from 0 to 1. After passing through the close delay module, but the signal change from 0 to 1 of the delay module is not delayed. The delay module outputs 1 to the AND gate. All three input conditions are 1, and the output of the AND gate is 1, generating the signal of "valve power-off state".

[0051] If the valve then changes from power-off to re-powered at this time, the actual open feedback signal OP of the valve is 0 and does not change. After passing through the NOT gate, it changes to 1 and is output to the AND gate; the actual closed feedback signal CP of the valve changes from 0 and does not change. After passing through the NOT gate, it changes to 1 and is output to the AND gate; the valve fault signal FP changes from 1 to 0. After passing through the close delay module and delaying for X seconds, it outputs 0 to the AND gate. The three input conditions are not all 1, and the output of the AND gate changes from 1 to 0, and the signal of "valve power-off state" disappears.

[0052] Such as Figure 3 , Unit 2 receives the "valve power-off state" signal from Unit 1, which is used to control whether Unit 2 starts the memory function. According to the "valve power-off state" signal from Unit 1, the signal transmission of Unit 2 can be divided into two types. The principle is as follows:

[0053] 1) When the valve is working normally, the actual open feedback signal OP of the valve and the output of selection module 1 are the two input signals of selection module 1. When Unit 2 receives the "valve power-off state" signal (used to trigger the memory function) from Unit 1 as 0, selection module 1 selects the actual open feedback signal OP of the valve as the output and sends it to the power-off close delay module 1. If there is no change in the actual open feedback signal OP from 1 to 0, the power-off close delay module 1 does not work and directly sends the input signal as the output signal, forming the final valve open feedback signal OP01; if there is a change in the actual open feedback signal OP from 1 to 0, the power-off close delay module 1 delays the input signal for 0.2 seconds and sends it out as the output signal, forming the final valve open feedback signal OP01.

[0054] When the valve is operating normally, the actual valve closing feedback signal CP and the output of selection module 2 are the two input signals of selection module 2. When unit 2 receives the "valve power failure state" signal from unit 1 (used to trigger the memory function) which is 0, selection module 2 selects the actual valve closing feedback signal CP as the output and sends it to the power failure closing delay module 2. If there is no transition of the actual valve closing feedback signal CP from 1 to 0, the power failure closing delay module 2 does not function and directly sends the input signal as the output signal, forming the final valve closing feedback signal CP01; if there is a transition of the actual valve closing feedback signal CP from 1 to 0, the power failure closing delay module 2 delays the input signal by 0.2 seconds and sends it as the output signal, forming the final valve closing feedback signal CP01.

[0055] 2) When the valve loses power, the actual opening feedback signal OP and the output of selection module 1 are the two input signals of selection module 1. When unit 2 receives the "valve power failure state" signal from unit 1 (used to trigger the memory function) which is 1, it triggers the memory function of unit 2. Selection module 1 selects the output of selection module 1 at the previous moment as the output of selection module 1 at this moment and sends it to the power failure closing delay module 1. If there is no transition of the actual valve opening feedback signal OP from 1 to 0, the power failure closing delay module 1 does not function and directly sends the input signal as the output signal, forming the final valve opening feedback signal OP01; if there is a transition of the actual valve opening feedback signal OP from 1 to 0, the power failure closing delay module 1 delays the input signal by 0.2 seconds and sends it as the output signal, forming the final valve opening feedback signal OP01.

[0056] When the valve loses power, the actual closing feedback signal CP and the output of selection module 2 are the two input signals of selection module 1. When unit 2 receives the "valve power failure state" signal from unit 1 (used to trigger the memory function) which is 1, it triggers the memory function of unit 2. Selection module 2 selects the output of selection module 2 at the previous moment as the output of selection module 2 at this moment and sends it to the power failure closing delay module 2. If there is no transition of the actual valve closing feedback signal CP from 1 to 0, the power failure closing delay module 2 does not function and directly sends the input signal as the output signal, forming the final valve opening feedback signal CP01; if there is a transition of the actual valve closing feedback signal CP from 1 to 0, the power failure closing delay module 2 delays the input signal by 0.2 seconds and sends it as the output signal, forming the final valve closing feedback signal CP01.

[0057] It is apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in all respects, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0058] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the various embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for handling the abnormal valve position feedback fault caused by the power failure of an intelligent electric valve, characterized in that: It includes the following steps: When the electric valve loses power, the logic of the power failure state judgment unit of the electric valve judges whether to trigger memory; if memory is triggered, the valve position feedback signal memory unit of the electric valve memorizes the valve position feedback signal 0.2 seconds before the current valve position and outputs it as the valve position feedback signal for logical operation; if memory is not triggered, the valve position feedback signal memory unit of the electric valve outputs the actual valve position feedback signal as the valve position feedback signal for logical operation; In the valve position feedback signal memory unit of the electric valve, when the valve is working normally, the actual valve opening feedback signal of the valve and the output of the first selection module are two input signals of the first selection module. When the valve position feedback signal memory unit of the electric valve receives the valve power failure state signal from the power failure state judgment unit of the electric valve as 0, the first selection module selects the actual valve opening feedback signal of the valve as the output and sends it to the first power failure closing delay module; if there is no change from 1 to 0 in the actual valve opening feedback signal of the valve, the first power failure closing delay module does not work and directly sends the input signal as the output signal, forming the final valve opening feedback signal 01; if there is a change from 1 to 0 in the actual valve opening feedback signal of the valve, the first power failure closing delay module delays the input signal for 0.2 seconds and sends it out as the output signal, forming the final valve opening feedback signal 01; When the valve is working normally, the actual valve closing feedback signal of the valve and the output of the second selection module are two input signals of the second selection module. When the valve position feedback signal memory unit of the electric valve receives the valve power failure state signal from the power failure state judgment unit of the electric valve as 0, the second selection module selects the actual valve closing feedback signal of the valve as the output and sends it to the second power failure closing delay module; if there is no change from 1 to 0 in the actual valve closing feedback signal of the valve, the second power failure closing delay module does not work and directly sends the input signal as the output signal, forming the final valve closing feedback signal 01; if there is a change from 1 to 0 in the actual valve closing feedback signal of the valve, the second power failure closing delay module delays the input signal for 0.2 seconds and sends it out as the output signal, forming the final valve closing feedback signal 01; In the valve position feedback signal memory unit of the electric valve, when the valve loses power, the actual valve opening feedback signal and the output of the first selection module are two input signals of the first selection module. When the valve position feedback signal memory unit of the electric valve receives the valve power failure state signal from the power failure state judgment unit of the electric valve as 1, the memory function of the valve position feedback signal memory unit of the electric valve is triggered, and the first selection module selects the output of the first selection module at the previous moment as the output of the first selection module at this moment and sends it to the first power failure closing delay module; if there is no change from 1 to 0 in the actual valve opening feedback signal of the valve, the first power failure closing delay module does not work and directly sends the input signal as the output signal, forming the final valve opening feedback signal 01; if there is a change from 1 to 0 in the actual valve opening feedback signal of the valve, the first power failure closing delay module delays the input signal for 0.2 seconds and sends it out as the output signal, forming the final valve opening feedback signal 01; When the valve loses power, the actual close feedback signal and the output of the second selection module are the two input signals of the first selection module. When the electric valve feedback signal memory unit receives the valve power loss state signal of 1 from the electric valve power loss state judgment unit, it triggers the memory function of the electric valve feedback signal memory unit. The second selection module selects the output of the second selection module at the previous moment as the output of the second selection module at this moment and sends it to the power loss second close delay module; if there is no change in the actual close feedback signal of the valve from 1 to 0, the power loss second close delay module does not function and directly sends the input signal as the output signal, forming the final valve open feedback signal 01; if there is a change in the actual close feedback signal of the valve from 1 to 0, the power loss second close delay module delays the input signal by 0.2 seconds and sends it out as the output signal, forming the final valve close feedback signal 01; The delay time of the first close delay module and the second close delay module is 0.2 seconds.

2. A method for handling the abnormal valve position feedback fault caused by the power loss of an intelligent electric valve according to claim 1, characterized in that: For the power loss of the electric valve, the actual open feedback signal, the actual close feedback signal, and the valve fault signal of the valve used to represent the power loss state are all completed within 0.2 seconds.

3. A method for handling the abnormal valve position feedback fault caused by the power loss of an intelligent electric valve according to claim 2, characterized in that: In the electric valve power loss state judgment unit, when the valve is in the normal fully open state, the actual open feedback signal of the valve is 1, which is converted to 0 after passing through the NOT gate and output to the AND gate; the actual close feedback signal of the valve is 0, which is converted to 1 after passing through the NOT gate and output to the AND gate; the valve fault signal is 0, and the output after passing through the close delay module is still 0 to the AND gate. If the three input conditions are not all 1, the output of the AND gate is 0, and the valve power loss state signal is not triggered.

4. A method for handling the abnormal valve position feedback fault caused by the power loss of an intelligent electric valve according to claim 3, characterized in that: If the valve loses power at this time, the actual open feedback signal of the valve changes from 1 to 0, which is converted to 1 after passing through the NOT gate and output to the AND gate; the actual close feedback signal of the valve is 0 and does not change, which is converted to 1 after passing through the NOT gate and output to the AND gate; the valve fault signal changes from 0 to 1, passing through the close delay module, but the signal change from 0 to 1 of the delay module is not delayed, and the output of the delay module is 1 to the AND gate. Since the three input conditions are all 1, the output of the AND gate is 1, generating the valve power loss state signal.

5. A method for handling the abnormal valve position feedback fault caused by the power loss of an intelligent electric valve according to claim 4, characterized in that: If the valve changes from power loss to re-powered at this time, the actual open feedback signal of the valve returns from 0 to 1, which is converted to 0 after passing through the NOT gate and output to the AND gate; the actual close feedback signal of the valve is 0 and does not change, which is converted to 1 after passing through the NOT gate and output to the AND gate; the valve fault signal changes from 1 to 0, passing through the close delay module and delaying for X seconds before the output is 0 to the AND gate. Since the three input conditions are not all 1, the output of the AND gate changes from 1 to 0, and the valve power loss state signal disappears.

6. A method for handling the abnormal valve position feedback fault caused by power failure of an intelligent electric valve according to claim 2, characterized in that: In the power failure state judgment unit of the electric valve, when the valve is in the normal fully closed state, the actual open feedback signal of the valve is 0, which is converted to 1 after passing through the NOT gate and output to the AND gate; the actual closed feedback signal of the valve is 1, which is converted to 0 after passing through the NOT gate and output to the AND gate; the valve fault signal is 0, and the output after passing through the close delay module is still 0 to the AND gate. If the three input conditions are not all 1, the output of the AND gate is 0, and the valve power failure state signal is not triggered.

7. A method for handling the abnormal valve position feedback fault caused by power failure of an intelligent electric valve according to claim 6, characterized in that: If the valve loses power at this time, the actual open feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the actual closed feedback signal of the valve changes from 1 to 0, and after passing through the NOT gate, it is converted to 1 and output to the AND gate; the valve fault signal changes from 0 to 1, passes through the close delay module, but the signal change from 0 to 1 of the delay module is not delayed, and the output of the delay module is 1 to the AND gate. If the three input conditions are all 1, the output of the AND gate is 1, and the valve power failure state signal is generated.

8. A method for handling the abnormal valve position feedback fault caused by power failure of an intelligent electric valve according to claim 7, characterized in that: If the valve changes from power failure to re-power at this time, the actual open feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the actual closed feedback signal of the valve returns from 0 to 1, and after passing through the NOT gate, it is converted to 0 and output to the AND gate; the valve fault signal changes from 1 to 0, passes through the close delay module and delays for X seconds, and then outputs 0 to the AND gate. If the three input conditions are not all 1, the output of the AND gate changes from 1 to 0, and the valve power failure state signal disappears.

9. A method for handling the abnormal valve position feedback fault caused by power failure of an intelligent electric valve according to claim 2, characterized in that: In the power failure state judgment unit of the electric valve, when the valve is in the normal intermediate state, the actual open feedback signal of the valve is 0, and the signal output to the AND gate after passing through the NOT gate is 1. The actual closed feedback signal of the valve is 0, and the signal output to the AND gate after passing through the NOT gate is 1. The valve fault signal is 0, and the signal output to the AND gate after passing through the close delay module is 0. The output of the AND gate is 0, and the valve power failure state signal is not triggered.

10. A method for handling the abnormal valve position feedback fault caused by power failure of an intelligent electric valve according to claim 9, characterized in that: If the valve loses power at this time, the actual open feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the actual closed feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it is converted to 1 and output to the AND gate; the valve fault signal changes from 0 to 1, passes through the close delay module, but the signal change from 0 to 1 of the delay module is not delayed, and the output of the delay module is 1 to the AND gate. If the three input conditions are all 1, the output of the AND gate is 1, and the valve power failure state signal is generated.

11. A method for handling the abnormal valve position feedback fault caused by power failure of an intelligent electric valve according to claim 10, characterized in that: If the valve changes from power failure to power restoration at this time, the actual open feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it changes to 1 and is output to the AND gate; the actual closed feedback signal of the valve is 0 and does not change. After passing through the NOT gate, it changes to 1 and is output to the AND gate; the valve fault signal changes from 1 to 0. After passing through the close delay module and delaying for X seconds, it outputs 0 to the AND gate. Since the three input conditions are not all 1, the output of the AND gate changes from 1 to 0, and the valve power failure status signal disappears.

12. A method for handling the abnormal valve position feedback fault caused by power failure of an intelligent electric valve according to claim 3 or 6 or 9, characterized in that: the delay time X of the close delay module is 1 - 5 seconds.

13. A method for handling the abnormal valve position feedback fault caused by power failure of an intelligent electric valve according to claim 5 or 8 or 11, characterized in that: the electric valve feedback signal memory unit receives the valve power failure status signal from the electric valve power failure state judgment unit and is used to control whether the electric valve feedback signal memory unit starts the memory function.

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