A control system of a gas engine and a method for detecting the tightness thereof

Abstract

The embodiment of the application discloses a control system of a gas engine and a sealing detection method thereof. The control system of the gas engine comprises an input branch, an output branch, a pre-charging branch, a first branch, an interlocking valve group, a pressure detection module and a control module; the input branch is communicated with a gas inlet and the gas engine; the output branch is communicated with the gas engine and a gas outlet; the interlocking valve group is arranged on the input branch and the first branch, and the first branch is used for communicating the input branch and the output branch; the pressure detection module detects the pressure of the interlocking valve group and forms a pressure signal; the pre-charging branch is communicated with a pre-charging gas inlet and the gas inlet through the interlocking valve group; the pre-charging branch injects the interlocking valve group with gas with a preset pressure through the pre-charging gas inlet in a pre-charging stage; and the control module determines the sealing of the interlocking valve group according to the pressure signal in a detection stage. Whether the interlocking valve group leaks can be determined, the leakage position can be accurately positioned, maintenance measures can be quickly taken, and the detection efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of gas engine technology, and in particular to a control system for a gas engine and a method for testing its sealing performance. Background Technology

[0002] Gas turbine engines primarily use gases such as ammonia and methane as fuel, which are delivered to the cylinders for combustion via a gas supply line. To ensure the safe operation of gas turbine engines, an interlock valve assembly is installed in the engine's gas supply line. In the event of a gas supply interruption or a safety malfunction, the interlock valve assembly receives a command from the engine controller and automatically closes two series-connected shut-off valves. Simultaneously, a third valve automatically opens, releasing the gas between the two series-connected shut-off valves. When the interlock valve assembly fails to seal, gas will leak into the downstream pipeline, seriously threatening the safety of the gas turbine engine. Therefore, checking the sealing performance of the interlock valve assembly is essential.

[0003] Currently, interlocked valve assemblies with valve position feedback are driven by the engine controller to energize and de-energize the valve body, thereby performing closing and opening actions. Position sensors installed on the valve monitor the valve position in real time and feed the signal back to the engine controller, realizing the monitoring of the valve's opening and closing status.

[0004] When operating an interlock valve assembly, it is essential to ensure a tight seal between the valve body sealing surface and the valve core with each closure to achieve a good seal. However, prolonged exposure to gas flow and frequent switching between power on and off can cause wear, scratches, or deformation of the sealing surface due to friction and erosion, leading to a decline in sealing performance. Furthermore, the gas, even after passing through a fine filter, still contains impurities. These impurities can accumulate inside the valve body, particularly in critical areas such as the valve core and seat, hindering the interlock valve assembly from sealing properly. Therefore, prolonged use of interlock valve assemblies can easily lead to sealing failure, resulting in gas leakage into downstream pipelines or the surrounding environment. However, the valve position feedback signal may still indicate an open or closed state, causing operators to mistakenly believe the valve assembly is functioning normally and there is no risk of leakage. Therefore, relying solely on the valve position feedback signal to determine the sealing performance of an interlock valve assembly poses a safety hazard. Summary of the Invention

[0005] This invention provides a control system for a gas engine and a method for detecting its sealing performance, in order to determine whether the interlock valve assembly is leaking, accurately locate the leak, facilitate rapid maintenance measures, improve detection efficiency, and eliminate safety hazards.

[0006] According to one aspect of the present invention, a control system for a gas engine is provided, the control system comprising: an input branch, an output branch, a pre-charge branch, a first branch, an interlock valve group, a pressure detection module, and a control module;

[0007] The input branch connects the gas inlet and the gas engine; the output branch connects the gas engine and the gas outlet; the interlock valve assembly is installed on the input branch and on the first branch, which is used to connect the input branch and the output branch;

[0008] The pressure detection module is installed on the branch where the interlock valve assembly is located; the pressure detection module is used to detect the pressure of the interlock valve assembly and generate a pressure signal;

[0009] The pre-charge branch is connected to the pre-charge inlet and the gas inlet via an interlock valve assembly;

[0010] The pre-charge branch is used to inject gas at a preset pressure into the interlock valve assembly through the pre-charge inlet during the pre-charge stage;

[0011] The control module is connected to the pressure detection module;

[0012] The control module is used to determine the sealing performance of the interlock valve assembly based on the pressure signal during the detection phase.

[0013] Optionally, the interlock valve assembly includes a first shut-off valve, a second shut-off valve, and a vent valve; the pressure detection module includes a first pressure sensing unit, a second pressure sensing unit, and a third pressure sensing unit.

[0014] The first pressure sensing unit, the first shut-off valve, the second shut-off valve, and the third pressure sensing unit are sequentially arranged on the input branch. The second pressure sensing unit and the vent valve are sequentially arranged on the first branch. The second pressure sensing unit is located on the side of the vent valve closer to the input branch. The control module is connected to the first shut-off valve, the second shut-off valve, the vent valve, the first pressure sensing unit, the second pressure sensing unit, and the third pressure sensing unit.

[0015] The first pressure sensing unit is used to detect the first pressure signal of the first shut-off valve, the second pressure sensing unit is used to detect the second pressure signal of the vent valve, and the third pressure sensing unit is used to detect the third pressure signal of the second shut-off valve.

[0016] The control module is used to determine that there is no leakage in the interlock valve group when the second pressure signal is equal to the preset pressure and the first and third pressure signals are both equal to zero during the detection phase.

[0017] The control module is also used to determine that the first shut-off valve is in a leaking state when the second pressure signal is less than the preset pressure, the first pressure signal is greater than zero, and the third pressure signal is equal to zero during the detection phase.

[0018] The control module is also used to determine that the second shut-off valve is in a leaking state when the second pressure signal is less than the preset pressure, the first pressure signal is equal to zero, and the third pressure signal is greater than zero during the detection phase.

[0019] The control module is also used to determine that the vent valve is in a leaking state when the second pressure signal is less than the preset pressure and both the first and third pressure signals are equal to zero during the detection phase.

[0020] Optionally, the control system of the gas engine also includes: a pre-charge gas purge valve; the pre-charge gas purge valve is located on the pre-charge branch; the pre-charge gas purge valve is connected to the control module;

[0021] The control module is also used to control the opening of the pre-charge gas purge valve and the second shut-off valve, and the closing of the vent valve before the pre-charge stage.

[0022] The control module is also used to control the pre-charge gas purge valve and the second shut-off valve to close when both the second pressure signal and the third pressure signal are equal to the preset pressure, after the pre-charge stage and before the detection stage.

[0023] Optionally, the control system of the gas engine also includes: a pressure regulating module and a venting module; the pressure regulating module is located on the input branch and on the side of the interlock valve group closer to the gas engine, and the venting module is located on the output branch; both the pressure regulating module and the venting module are connected to the control module;

[0024] The pressure regulating module and the venting module are used to vent the gas in the input branch, output branch and first branch before the pre-charge stage;

[0025] The pressure regulating module and the venting module are also used to vent the gas between the interlock valve assembly and the gas engine after the pre-charge phase.

[0026] Optionally, the control system of the gas engine also includes: a first valve;

[0027] The first valve is located in the input branch and between the gas inlet and the interlock valve assembly;

[0028] The first valve is used to control the connection status of the branch between the gas inlet and the interlock valve group.

[0029] According to another aspect of the present invention, a method for testing the sealing performance of a gas engine control system is provided. The gas engine control system includes an input branch, an output branch, a pre-charge branch, a first branch, an interlock valve assembly, a pressure detection module, and a control module. The input branch connects the gas inlet and the gas engine; the output branch connects the gas engine and the gas outlet; the interlock valve assembly is disposed on the input branch and on the first branch, the first branch connecting the input branch and the output branch; the pressure detection module is disposed on the branch where the interlock valve assembly is located; the pre-charge branch connects the pre-charge inlet and the gas inlet through the interlock valve assembly; the control module is connected to the pressure detection module.

[0030] The sealing test method for the control system of this gas engine includes:

[0031] During the pre-charge phase, the control pre-charge branch injects gas at a preset pressure into the interlock valve assembly through the pre-charge air inlet;

[0032] During the testing phase, after the control pressure detection module detects the pressure of the interlock valve group, the sealing performance of the interlock valve group is determined based on the pressure signal provided by the pressure detection module.

[0033] Optionally, the interlock valve assembly includes a first shut-off valve, a second shut-off valve, and a vent valve; the pressure detection module includes a first pressure sensing unit, a second pressure sensing unit, and a third pressure sensing unit.

[0034] The first pressure sensing unit, the first shut-off valve, the second shut-off valve, and the third pressure sensing unit are sequentially arranged on the input branch. The second pressure sensing unit and the vent valve are sequentially arranged on the first branch. The second pressure sensing unit is located on the side of the vent valve closer to the input branch. The control module is connected to the first shut-off valve, the second shut-off valve, the vent valve, the first pressure sensing unit, the second pressure sensing unit, and the third pressure sensing unit.

[0035] During the testing phase, after the control pressure detection module detects the pressure of the interlock valve assembly, it determines the sealing performance of the interlock valve assembly based on the pressure signal provided by the pressure detection module, including:

[0036] The system controls the first pressure sensing unit to detect the first pressure signal of the first shut-off valve, the second pressure sensing unit to detect the second pressure signal of the vent valve, and the third pressure sensing unit to detect the third pressure signal of the second shut-off valve.

[0037] When the second pressure signal equals the preset pressure, and both the first and third pressure signals are equal to zero, it is determined that the interlock valve assembly has no leakage.

[0038] The first shut-off valve is determined to be in a leakage state when the second pressure signal is less than the preset pressure, the first pressure signal is greater than zero, and the third pressure signal is equal to zero.

[0039] The second shut-off valve is determined to be in a leaking state when the second pressure signal is less than the preset pressure, the first pressure signal is equal to zero, and the third pressure signal is greater than zero.

[0040] The vent valve is determined to be in a leaking state when the second pressure signal is less than the preset pressure and both the first and third pressure signals are equal to zero.

[0041] Optionally, the control system of the gas engine also includes a pre-charge gas purge valve; the pre-charge gas purge valve is located on the pre-charge branch; the pre-charge gas purge valve is connected to the control module; before the pre-charge stage, it also includes:

[0042] The pre-charge gas purge valve and the second shut-off valve are opened, and the vent valve is closed.

[0043] The process, which takes place after the pre-charging phase and before the testing phase, also includes:

[0044] When the second pressure signal and the third pressure signal are equal to the preset pressure, the pre-charge gas purging valve and the second shut-off valve are closed.

[0045] Optionally, the control system of the gas engine also includes a pressure regulating module and a venting module; the pressure regulating module is located on the input branch and on the side of the interlock valve group closer to the gas engine, and the venting module is located on the output branch; both the pressure regulating module and the venting module are connected to the control module.

[0046] Prior to the testing phase, it also includes:

[0047] Control the voltage regulation module and the venting module to start;

[0048] The pressure regulating module is shut down when the third pressure signal is equal to zero.

[0049] Prior to the pre-charging phase, it also includes:

[0050] The first shut-off valve, the second shut-off valve, the vent valve, the pressure regulating module, and the venting module are all in the open state;

[0051] When the first pressure signal, the second pressure signal, and the third pressure signal are all equal to zero, the first shut-off valve, the second shut-off valve, the vent valve, the pressure regulating module, and the venting module are all kept in the closed state.

[0052] Optionally, the control system of the gas engine also includes a first valve; the first valve is located in the input branch and between the gas inlet and the interlock valve assembly;

[0053] Prior to the pre-charging phase, it also includes:

[0054] The gas engine is controlled to be in a stopped state and the first valve is in a closed state.

[0055] The technical solution of this invention provides a control system for a gas engine. An interlock valve group is located on an input branch and a first branch, the first branch connecting the input and output branches. A pressure detection module is located on the branch containing the interlock valve group. The pressure detection module detects the pressure of the interlock valve group and generates a pressure signal that is transmitted to the control module. During the pre-charging stage, the pre-charging branch injects gas at a preset pressure into the interlock valve group through the pre-charging inlet. During the detection stage, the control module determines the sealing performance of the interlock valve group by comparing the changes in readings of the pressure detection modules at the front, rear, and internal ends of the interlock valve group. This allows for quick determination of whether the interlock valve group has failed to seal. If a leak occurs, the location of the leak can be quickly identified, facilitating rapid repair measures by personnel to eliminate safety hazards and improve the efficiency of sealing performance testing of the interlock valve group.

[0056] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of the structure of a gas engine control system according to an embodiment of the present invention;

[0059] Figure 2 This is a schematic diagram of the structure of another gas engine control system provided according to an embodiment of the present invention;

[0060] Figure 3 This is a flowchart of a method for testing the sealing performance of a gas engine control system according to an embodiment of the present invention;

[0061] Figure 4 This is a flowchart of another method for testing the sealing performance of a gas engine control system according to an embodiment of the present invention. Detailed Implementation

[0062] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0063] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0064] To address the problem that existing technologies that rely on a single valve position feedback signal to determine the sealing performance of interlock valve assemblies fail to reflect the actual sealing condition, this invention provides the following technical solution:

[0065] Figure 1 This is a schematic diagram of the structure of a gas engine control system according to an embodiment of the present invention. Figure 1 As shown, the control system of the gas engine includes: an input branch 10, an output branch 20, a pre-charge branch 30, a first branch 40, an interlock valve assembly 50, a pressure detection module 60, and a control module 70; the input branch 10 connects the gas inlet 101 and the gas engine 102; the output branch 20 connects the gas engine 102 and the gas outlet 103; the interlock valve assembly 50 is installed on the input branch 10 and on the first branch 40, the first branch 40 being used to connect the input branch 10 and the output branch 20; the pressure detection module 60... The pressure detection module 60 is located on the branch where the interlock valve assembly 50 is located; the pressure detection module 60 is used to detect the pressure of the interlock valve assembly 50 and generate a pressure signal; the pre-charge branch 30 is connected to the pre-charge inlet 301 and the gas inlet 101 through the interlock valve assembly 50; the pre-charge branch 30 is used to inject gas at a preset pressure into the interlock valve assembly 50 through the pre-charge inlet 301 during the pre-charge stage; the control module 70 is connected to the pressure detection module 60; the control module 70 is used to determine the sealing performance of the interlock valve assembly 50 based on the pressure signal during the detection stage.

[0066] In this embodiment of the invention, input branch 10 is a gas input pipeline. Output branch 20 can be a gas output pipeline or an output pipeline for gases such as nitrogen. Pre-charge branch 30 is a nitrogen input pipeline during the pre-charge stage before the interlock valve assembly 50 is tested for sealing. First branch 40 connects input branch 10 and output branch 20. When the gas engine control system stops the gas supply or a safety malfunction occurs, the gas in the pipeline is released through first branch 40 and output branch 20. Interlock valve assembly 50 can consist of two shut-off valves connected in series on input branch 10 and a third valve that releases the pressure in the pipeline between the two shut-off valves. In the event of a gas supply stoppage or a safety malfunction, interlock valve assembly 50 receives a command from control module 70, automatically closes the two connected shut-off valves, and simultaneously opens the third valve to release the gas between the two connected shut-off valves. Control module 70 is connected to pressure detection module 60, which detects the pressure of interlock valve assembly 50 and generates a pressure signal that is transmitted to control module 70. The control module 70 determines the sealing performance of the interlock valve assembly 50 based on the pressure signal generated by the pressure detection module 60. The pressure detection module 60 can be a pressure sensor. The control module 70 can be a gas engine controller.

[0067] In the control system of the gas engine, gas enters the gas engine 102 after passing through the interlock valve assembly 50. The control module 70 controls the opening and closing of the interlock valve assembly 50 and other valves in the pipeline, and monitors the gas pipeline pressure in real time through pressure detection modules 60 installed at the front end, rear end and inside of the interlock valve assembly 50. In addition, a nitrogen purging pipeline and a gas venting pipeline are also provided. In the event of an abnormality or shutdown of the gas engine 102, residual gas in the pipeline is purged with nitrogen to prevent gas accumulation and potential safety risks.

[0068] Before testing the sealing performance of the interlock valve assembly 50, it is confirmed that the gas engine 102 is shut down and that no gas is flowing into the gas inlet 101. Then, the control module 70 automatically executes the sealing performance testing procedure for the interlock valve assembly 50: First, the valves of the interlock valve assembly 50 are opened to purge the gas in the input branch 10 and the output branch 20, and then the valves of the interlock valve assembly 50 are closed. Then, gas at a preset pressure is injected into the interlock valve assembly 50 through the pre-charge branch 30. For example, the preset pressure is 6 bar, and the injected gas is nitrogen. 6 bar of nitrogen is injected into the interlock valve assembly 50 through the pre-charge branch 30. Gas injection into the interlock valve assembly 50 is stopped when the control module 70 detects that the reading inside the interlock valve assembly 50 matches that of the downstream pressure detection module 60, or when the difference between the readings of the interlock valve assembly 50 and the downstream pressure detection module 60 is within the allowable error range. Then, the gas injection into the interlock valve assembly 50 is stopped, and the gas at the downstream end of the interlock valve assembly 50 is purged through the output branch 20. Finally, a pressure holding period is established for a preset time, exemplarily 5 minutes. After 5 minutes of pressure holding, the control module 70 determines the sealing performance of each valve within the interlock valve assembly 50 by comparing the changes in readings of the front and rear ends of the interlock valve assembly 50 and the internal pressure detection module 60 during the pressure holding process. For example, during the pressure holding process, if the control module 70 detects that the reading of the internal pressure detection module 60 of the interlock valve assembly 50 remains unchanged, and the readings of the front and rear ends of the interlock valve assembly 50 pressure detection modules 60 are zero, it indicates that there is no leakage in any valve of the interlock valve assembly 50, and the control module 70 outputs that the interlock valve assembly 50 has no leakage. Additionally, if the reading of the pressure detection module 60 at the front end of the interlock valve assembly 50 increases, the reading of the pressure detection module 60 on the first branch 40 decreases, and the reading of the pressure detection module 60 at the rear end of the interlock valve assembly 50 remains unchanged, it can be determined that the valve at the front end of the interlock valve assembly 50 is leaking. If the reading of the pressure detection module 60 at the front end of the interlock valve assembly 50 remains unchanged, the reading of the pressure detection module 60 on the first branch 40 decreases, and the reading of the pressure detection module 60 at the rear end of the interlock valve assembly 50 increases, it can be determined that the valve at the rear end of the interlock valve assembly 50 is leaking. If the reading of the pressure detection module 60 at the front end of the interlock valve assembly 50 remains unchanged, the reading of the pressure detection module 60 on the first branch 40 decreases, and the reading of the pressure detection module 60 at the rear end of the interlock valve assembly 50 remains unchanged, it can be determined that the valve located on the first branch 40 in the interlock valve assembly 50 is leaking. By applying the technical solution of the present invention, it is possible to determine whether the sealing performance of the interlock valve assembly 50 has failed in a short time. If the interlock valve assembly 50 leaks, the location of the leak can be quickly located, which facilitates the staff to take maintenance measures quickly, eliminate safety hazards, and improve the efficiency of sealing performance testing of the interlock valve assembly 50.

[0069] The technical solution of this invention provides a control system for a gas engine. An interlock valve group is located on an input branch and a first branch, the first branch connecting the input and output branches. A pressure detection module is located on the branch containing the interlock valve group. The pressure detection module detects the pressure of the interlock valve group and generates a pressure signal that is transmitted to the control module. During the pre-charging stage, the pre-charging branch injects gas at a preset pressure into the interlock valve group through the pre-charging inlet. During the detection stage, the control module determines the sealing performance of the interlock valve group by comparing the changes in readings of the pressure detection modules at the front, rear, and internal ends of the interlock valve group. This allows for quick determination of whether the interlock valve group has failed to seal. If a leak occurs, the location of the leak can be quickly identified, facilitating rapid repair measures by personnel to eliminate safety hazards and improve the efficiency of sealing performance testing of the interlock valve group.

[0070] Figure 2 This is a schematic diagram of the structure of another gas engine control system provided according to an embodiment of the present invention. In an optional embodiment of the present invention, refer to... Figure 2 The interlock valve assembly 50 includes a first shut-off valve 501, a second shut-off valve 502, and a vent valve 503; the pressure detection module 60 includes a first pressure sensing unit 601, a second pressure sensing unit 602, and a third pressure sensing unit 603; the first pressure sensing unit 601, the first shut-off valve 501, the second shut-off valve 502, and the third pressure sensing unit 603 are sequentially arranged on the input branch 10, and the second pressure sensing unit 602 and the vent valve 503 are sequentially arranged on the first branch 40, with the second pressure sensing unit 602 located on the side of the vent valve 503 closest to the input branch 10; the control module 70 is connected to the first shut-off valve 501, the second shut-off valve 502, the vent valve 503, the first pressure sensing unit 601, the second pressure sensing unit 602, and the third pressure sensing unit 603; the first pressure sensing unit 601 is used to detect the first pressure signal of the first shut-off valve 501, and the second pressure sensing unit 603 is used to detect the first pressure signal of the first shut-off valve 501, and the second pressure sensing unit 603 is used to detect the first pressure signal of the first shut-off valve 501, and the second pressure sensing unit 603 is used to detect the first pressure signal of the first shut-off valve 501, and the second pressure sensing unit 603 is used to detect the first pressure signal of the first shut-off valve 501, and the second pressure sensing unit 603 is used to detect the first pressure signal of the first shut-off valve 501, and the third pressure sensing unit 603; The sensing unit 602 is used to detect the second pressure signal of the vent valve 503, and the third pressure sensing unit 603 is used to detect the third pressure signal of the second shut-off valve 502. The control module 70 is used to determine that the interlock valve group 50 has no leakage when the second pressure signal is equal to the preset pressure and both the first and third pressure signals are equal to zero during the detection phase. The control module 70 is also used to determine that the first shut-off valve 501 is in a leakage state when the second pressure signal is less than the preset pressure, the first pressure signal is greater than zero, and the third pressure signal is equal to zero during the detection phase. The control module 70 is also used to determine that the second shut-off valve 502 is in a leakage state when the second pressure signal is less than the preset pressure, the first pressure signal is equal to zero, and the third pressure signal is greater than zero during the detection phase. The control module 70 is also used to determine that the vent valve 503 is in a leakage state when the second pressure signal is less than the preset pressure and both the first and third pressure signals are equal to zero during the detection phase.

[0071] In this embodiment of the invention, the first pressure sensing unit 601, the second pressure sensing unit 602, and the third pressure sensing unit 603 can all be pressure sensors. The first pressure sensing unit 601, the first shut-off valve 501, the second shut-off valve 502, and the third pressure sensing unit 603 are sequentially disposed on the input branch 10, and the second pressure sensing unit 602 and the vent valve 503 are sequentially disposed on the first branch 40. The first shut-off valve 501 is used to control the flow on / off of the input branch 10. The second shut-off valve 502 is connected in series with the first shut-off valve 501, and the vent valve 503 is disposed on the first branch 40 to balance pressure or release gas. The first pressure sensing unit 601 detects the first pressure signal of the first shut-off valve 501, the second pressure sensing unit 602 detects the second pressure signal of the vent valve 503, and the third pressure sensing unit 603 detects the third pressure signal of the second shut-off valve 502. In the control system of the gas engine, the control module 70 can perform a sealing test on the interlock valve assembly 50 by comparing the changes in the first pressure signal, the second pressure signal, and the third pressure signal. After the pre-charge phase and before the detection phase, nitrogen is injected into the interlock valve assembly 50, and the second pressure sensing unit 602 shows a reading, indicating that the second pressure signal equals the preset pressure (e.g., 6 bar). At this time, because the first shut-off valve 501 is closed during the nitrogen injection process, the corresponding reading of the first pressure sensing unit 601 at the front end of the interlock valve assembly 50 is 0. And because the gas in the venting pipeline is emptied after the nitrogen injection process at the rear end of the interlock valve assembly 50, the corresponding reading of the third pressure sensing unit 603 is also 0.

[0072] During the testing phase, the sealing performance of the interlock valve assembly 50 is determined by maintaining pressure for a period of time using the following methods:

[0073] (1) When the control module 70 detects that the second pressure signal is always equal to the preset pressure, and the first pressure signal and the third pressure signal are always equal to zero, it determines that the interlock valve group 50 has no leakage.

[0074] (2) When the control module 70 detects that the second pressure signal is less than the preset pressure (i.e., the reading of the second pressure sensing unit 602 decreases), the first pressure signal is greater than zero (i.e., the reading of the first pressure sensing unit 601 increases), and the third pressure signal is equal to zero, it determines that the first shut-off valve 501 is in a leaking state. At this time, the control module 70 outputs that the first shut-off valve 501 is leaking, reminding the staff to take timely maintenance measures to improve the safety of the gas engine control system.

[0075] (3) When the control module 70 detects that the second pressure signal is less than the preset pressure (i.e., the reading of the second pressure sensing unit 602 decreases), the first pressure signal is equal to zero, and the third pressure signal is greater than zero (i.e., the reading of the third pressure sensing unit 603 increases), it determines that the second shut-off valve 502 is in a leaking state. At this time, the control module 70 outputs that the second shut-off valve 502 is leaking, reminding the staff to take timely maintenance measures to improve the safety of the gas engine control system.

[0076] (4) When the control module 70 detects that the second pressure signal is less than the preset pressure (i.e. the reading of the second pressure sensing unit 602 drops), and the first pressure signal and the third pressure signal are both equal to zero, the vent valve 503 is determined to be in a leaking state. At this time, the control module 70 outputs that the vent valve 503 is leaking, reminding the staff to take timely maintenance measures to improve the safety of the gas engine control system.

[0077] In an optional embodiment of the present invention, reference is made to... Figure 2 The control system of the gas engine also includes: a pre-charge gas purge valve 302; the pre-charge gas purge valve 302 is located on the pre-charge branch 30; the pre-charge gas purge valve 302 is connected to the control module 70; the control module 70 is also used to control the pre-charge gas purge valve 302 and the second shut-off valve 502 to open and the vent valve 503 to close before the pre-charge stage; the control module 70 is also used to control the pre-charge gas purge valve 302 and the second shut-off valve 502 to close after the pre-charge stage and before the detection stage, when the second pressure signal and the third pressure signal are both equal to the preset pressure.

[0078] In this embodiment of the invention, the pre-charge gas purge valve 302 can be a nitrogen purge valve. Before the pre-charge stage, the control module 70 controls the pre-charge gas purge valve 302 and the second shut-off valve 502 to open, and the vent valve 503 to close, injecting nitrogen gas at a preset pressure (e.g., 6 bar) from the pre-charge inlet 301 through the pre-charge branch 30 into the interlock valve assembly 50. When the control module 70 detects that both the second pressure signal and the third pressure signal are equal to the preset pressure (e.g., 6 bar), it controls the pre-charge gas purge valve 302 and the second shut-off valve 502 to close. The pre-charge stage can remove air and impurities, ensuring the purity of the system. As an inert gas, nitrogen can replace the air inside the interlock valve assembly 50 and in the pipeline, preventing residual oxygen from mixing with flammable and explosive gases and causing safety hazards. At the same time, the purging effect of the nitrogen gas removes dust, oil, and other impurities from the pipeline. By pre-charging with gas, a reference pressure can be established for the subsequent sealing performance testing of the interlock valve assembly 50, optimizing the sealing performance testing logic of the interlock valve assembly 50 and improving the reliability of the sealing performance testing of the interlock valve assembly 50.

[0079] In an optional embodiment of the present invention, reference is made to... Figure 2The control system of the gas engine also includes a pressure regulating module 80 and a venting module 90. The pressure regulating module 80 is located on the input branch 10 and on the side of the interlock valve group 50 close to the gas engine 102, and the venting module 90 is located on the output branch 20. Both the pressure regulating module 80 and the venting module 90 are connected to the control module 70. The pressure regulating module 80 and the venting module 90 are used to vent the gas in the input branch 10, the output branch 20 and the first branch 40 before the pre-charging stage. The pressure regulating module 80 and the venting module 90 are also used to vent the gas between the interlock valve group 50 and the gas engine 102 after the pre-charging stage.

[0080] In this embodiment of the invention, the pressure regulating module 80 can be a pressure regulating valve, and the venting module 90 can be a pressure relief valve. Before the pre-charging stage, the control module 70 controls the first shut-off valve 501, the second shut-off valve 502, the vent valve 503, the pressure regulating module 80, and the venting module 90 located at the end of the gas engine 102 to be in the open state, thus venting the gas in the gas pipeline. When the control module 70 detects that the pressure signals output by the first pressure sensing unit 601, the second pressure sensing unit 602, and the third pressure sensing unit 603 are all zero, it indicates that the gas in the gas pipeline has been vented. Then, the control module 70 controls the first shut-off valve 501, the second shut-off valve 502, the vent valve 503, the pressure regulating module 80, and the venting module 90 located at the end of the gas engine 102 to be in the closed state. This removes residual gas from the pipeline and avoids potential safety hazards. Then, the control module 70 controls the pre-charge gas purge valve 302 and the second shut-off valve 502 to open, and the vent valve 503 to close, injecting nitrogen gas at a preset pressure (e.g., 6 bar) from the pre-charge inlet 301 through the pre-charge branch 30 into the interlock valve group 50. When the control module 70 detects that both the second pressure signal and the third pressure signal are equal to the preset pressure (e.g., 6 bar), it controls the pre-charge gas purge valve 302 and the second shut-off valve 502 to close.

[0081] After the control module 70 closes the pre-charge gas purge valve 302 and the second shut-off valve 502, the control module 70 controls the pressure regulating module 80 and the venting module 90 to be in the open state, venting the nitrogen remaining between the interlock valve assembly 50 and the gas engine 102. When the control module 70 detects that the pressure signal output by the third pressure sensing unit 603 is zero, it indicates that the nitrogen remaining between the interlock valve assembly 50 and the gas engine 102 has been vented, at which point the control module 70 controls the pressure regulating module 80 to close. After maintaining pressure for a period of time (e.g., 5 minutes), the control module 70 performs a sealing test on the interlock valve assembly 50 by comparing the changes in the pressure signals output by the first pressure sensing unit 601, the second pressure sensing unit 602, and the third pressure sensing unit 603. By eliminating interference from impurities in the pipeline, the sealing test accuracy of the interlock valve assembly 50 is ensured.

[0082] In an optional embodiment of the present invention, reference is made to... Figure 2 The control system of the gas engine also includes: a first valve 104; the first valve 104 is located in the input branch 10 and between the gas inlet 101 and the interlock valve group 50; the first valve 104 is used to control the connection status of the branch between the gas inlet 101 and the interlock valve group 50.

[0083] In this embodiment of the invention, the first valve 104 may be a ball valve. The first valve 104 is disposed between the gas inlet 101 and the interlock valve assembly 50. Before performing a sealing test on the interlock valve assembly 50, it is necessary to ensure that the gas engine 102 is in a stopped state and that the first valve 104 at the gas inlet 101 is in a closed state to prevent the gas engine 102 from being accidentally started, which could cause mechanical injury to the monitoring equipment or maintenance personnel, and to avoid safety risks caused by gas leakage.

[0084] It should be noted that, in any embodiment of the present invention, when comparing the pressure signals output by each pressure sensing unit with the preset pressure, they can be completely equal, or the difference between the pressure signal and the preset pressure can be less than or equal to a preset deviation. For example, the preset deviation is ±0.5% of the full scale of the pressure sensing unit. For instance, if the range of the pressure sensing unit is 0-10 bar, then the preset deviation is ±0.05 bar. That is, when determining that the pressure signal output by the pressure sensing unit is equal to the preset pressure, if the pressure signal output by the pressure sensing unit is equal to the preset pressure, or equal to the preset pressure ±0.05 bar, it can be considered that the pressure signal output by the pressure sensing unit is equal to the preset pressure; no specific limitation is made here.

[0085] Figure 3 This is a flowchart illustrating a method for testing the sealing performance of a gas engine control system according to an embodiment of the present invention. This embodiment is applicable to testing the sealing performance of a gas engine control system, and the method for testing the sealing performance of the gas engine control system can be executed by the gas engine control system itself. (Reference) Figure 1 The control system of the gas engine includes an input branch 10, an output branch 20, a pre-charge branch 30, a first branch 40, an interlock valve assembly 50, a pressure detection module 60, and a control module 70. The input branch 10 connects the gas inlet 101 and the gas engine 102; the output branch 20 connects the gas engine 102 and the outlet 103; the interlock valve assembly 50 is located on the input branch 10 and on the first branch 40, which connects the input branch 10 and the output branch 20; the pressure detection module 60 is located on the branch containing the interlock valve assembly 50; the pre-charge branch 30 connects the pre-charge inlet 301 and the gas inlet 101 via the interlock valve assembly 50; and the control module 70 is connected to the pressure detection module 60. Figure 3As shown, the sealing test method for the control system of this gas engine includes:

[0086] S110. During the pre-charge stage, the control pre-charge branch injects gas at a preset pressure into the interlock valve group through the pre-charge air inlet.

[0087] For details, please refer to Figure 1 Before testing the sealing performance of the interlock valve assembly 50, it is confirmed that the gas engine 102 is shut down and that no gas is flowing into the gas inlet 101. Then, the control module 70 automatically executes the sealing performance testing procedure for the interlock valve assembly 50: First, the valves of the interlock valve assembly 50 are opened to purge the gas in the input branch 10 and the output branch 20, and then the valves of the interlock valve assembly 50 are closed. Then, gas at a preset pressure is injected into the interlock valve assembly 50 through the pre-charge branch 30. For example, the preset pressure is 6 bar, and the injected gas is nitrogen. 6 bar of nitrogen is injected into the interlock valve assembly 50 through the pre-charge branch 30. Gas injection into the interlock valve assembly 50 is stopped when the control module 70 detects that the reading inside the interlock valve assembly 50 matches that of the downstream pressure detection module 60, or when the difference between the readings of the interlock valve assembly 50 and the downstream pressure detection module 60 is within the allowable error range. Then, the gas injection into the interlock valve assembly 50 is stopped, and the gas at the downstream end of the interlock valve assembly 50 is purged through the output branch 20.

[0088] S120. During the detection phase, after the control pressure detection module detects the pressure of the interlock valve group, the sealing performance of the interlock valve group is determined based on the pressure signal provided by the pressure detection module.

[0089] Specifically, during the testing phase, a pressure holding period is performed for a preset time, for example, 5 minutes. After 5 minutes of pressure holding, the control module 70 determines the sealing performance of each valve within the interlock valve assembly 50 by comparing the changes in pressure signals provided by the pressure detection modules 60 at the front, rear, and internal ends of the interlock valve assembly 50 during the pressure holding process. For example, during the pressure holding process, if the control module 70 detects that the reading of the pressure detection module 60 inside the interlock valve assembly 50 remains unchanged, and the readings of the pressure detection modules 60 at the front and rear ends of the interlock valve assembly 50 are zero, it indicates that there is no leakage in any valve of the interlock valve assembly 50, and the control module 70 outputs that the interlock valve assembly 50 has no leakage. Additionally, if the reading of the pressure detection module 60 at the front end of the interlock valve assembly 50 increases, the reading of the pressure detection module 60 on the first branch 40 decreases, and the reading of the pressure detection module 60 at the rear end of the interlock valve assembly 50 remains unchanged, it can be determined that the valve at the front end of the interlock valve assembly 50 is leaking. If the reading of the pressure detection module 60 at the front end of the interlock valve assembly 50 remains unchanged, the reading of the pressure detection module 60 on the first branch 40 decreases, and the reading of the pressure detection module 60 at the rear end of the interlock valve assembly 50 increases, it can be determined that the valve at the rear end of the interlock valve assembly 50 is leaking. If the reading of the pressure detection module 60 at the front end of the interlock valve assembly 50 remains unchanged, the reading of the pressure detection module 60 on the first branch 40 decreases, and the reading of the pressure detection module 60 at the rear end of the interlock valve assembly 50 remains unchanged, it can be determined that the valve located on the first branch 40 in the interlock valve assembly 50 is leaking.

[0090] The technical solution of this invention provides a method for detecting the sealing performance of a gas engine control system. During the pre-charging stage, the control pre-charging branch injects gas at a preset pressure into the interlock valve assembly through the pre-charging inlet. During the detection stage, the control pressure detection module detects the pressure of the interlock valve assembly and determines the sealing performance of the interlock valve assembly based on the pressure signal provided by the pressure detection module. This method can quickly determine whether the sealing performance of the interlock valve assembly has failed. If a leak occurs in the interlock valve assembly, the location of the leak can be quickly located, facilitating rapid maintenance by personnel to eliminate safety hazards and improve the efficiency of sealing performance testing of the interlock valve assembly.

[0091] Figure 4 This is a flowchart of another method for testing the sealing performance of a gas engine control system according to an embodiment of the present invention. This embodiment is a detailed description of the technical features of the above embodiment. (See reference...) Figure 2The interlock valve assembly 50 includes a first shut-off valve 501, a second shut-off valve 502, and a vent valve 503; the pressure detection module 60 includes a first pressure sensing unit 601, a second pressure sensing unit 602, and a third pressure sensing unit 603; the first pressure sensing unit 601, the first shut-off valve 501, the second shut-off valve 502, and the third pressure sensing unit 603 are sequentially arranged on the input branch 10, and the second pressure sensing unit 602 and the vent valve 503 are sequentially arranged on the first branch 40, with the second pressure sensing unit 602 located on the side of the vent valve 503 closer to the input branch 10; the control module 70 is connected to the first shut-off valve 501, the second shut-off valve 502, the vent valve 503, the first pressure sensing unit 601, the second pressure sensing unit 602, and the third pressure sensing unit 603. The gas engine control system also includes a pre-charge gas purge valve 302; the pre-charge gas purge valve 302 is located on the pre-charge branch 30; the pre-charge gas purge valve 302 is connected to the control module 70. The gas engine control system also includes a pressure regulating module 80 and a venting module 90; the pressure regulating module 80 is located on the input branch 10 and on the side of the interlock valve assembly 50 closest to the gas engine 102, and the venting module 90 is located on the output branch 20; both the pressure regulating module 80 and the venting module 90 are connected to the control module 70. The gas engine control system also includes a first valve 104; the first valve 104 is located on the input branch 10 and between the gas inlet 101 and the interlock valve assembly 50.

[0092] like Figure 4 As shown, the sealing test method for the control system of this gas engine includes:

[0093] S210, Control the gas engine to be in a stopped state and the first valve to be in a closed state.

[0094] Specifically, first confirm that the gas engine 102 is in a stopped state and the first valve 104 is in a closed state. This is to prevent the gas engine 102 from being accidentally started, which could cause mechanical injury to monitoring equipment or maintenance personnel, and to avoid safety risks caused by gas leaks.

[0095] S211, the first shut-off valve, the second shut-off valve, the vent valve, the pressure regulating module, and the venting module are all in the open state.

[0096] Specifically, before the pre-charging stage, the control module 70 controls the first shut-off valve 501, the second shut-off valve 502, the vent valve 503, the pressure regulating module 80, and the venting module 90 located at the end of the gas engine 102 to be in the open state to vent the gas in the gas pipeline.

[0097] S212. When the first pressure signal, the second pressure signal, and the third pressure signal are all equal to zero, the first shut-off valve, the second shut-off valve, the vent valve, the pressure regulating module, and the venting module are all controlled to be in the closed state.

[0098] Specifically, when the control module 70 detects that the first pressure signal output by the first pressure sensing unit 601, the second pressure signal output by the second pressure sensing unit 602, and the third pressure signal output by the third pressure sensing unit 603 are all zero, it indicates that the gas in the gas pipeline has been vented. Subsequently, the control module 70 controls the first shut-off valve 501, the second shut-off valve 502, the vent valve 503, the pressure regulating module 80, and the venting module 90 located at the end of the gas engine 102 to all be in a closed state. This removes any residual gas in the pipeline, preventing potential safety hazards.

[0099] S213, control the pre-charge gas purge valve and the second shut-off valve to open, and the vent valve to close.

[0100] Specifically, after the control module 70 controls the first shut-off valve 501, the second shut-off valve 502, the vent valve 503, the pressure regulating module 80, and the venting module 90 located at the end of the gas engine 102 to be in the closed state, it then controls the pre-charge gas purge valve 302 to open and the second shut-off valve 502 to close the vent valve 503, in preparation for the pre-charge stage.

[0101] S214. During the pre-charge stage, the control pre-charge branch injects gas at a preset pressure into the interlock valve assembly through the pre-charge inlet.

[0102] Specifically, during the pre-charge phase, nitrogen gas at a preset pressure (e.g., 6 bar) is injected from the pre-charge inlet 301 into the interlock valve assembly 50 via the pre-charge branch 30.

[0103] S215. When the second pressure signal and the third pressure signal are equal to the preset pressure, control the pre-charge gas purge valve and the second shut-off valve to close.

[0104] Specifically, when the control module 70 detects that both the second pressure signal and the third pressure signal are equal to the preset pressure (e.g., 6 bar), it controls the pre-charge gas purge valve 302 and the second shut-off valve 502 to close.

[0105] S216, Control the voltage regulation module and the venting module to start.

[0106] Specifically, after the control module 70 controls the pre-charge gas purge valve 302 and the second shut-off valve 502 to close, the control module 70 controls the pressure regulating module 80 and the venting module 90 to be in the open state, so as to vent the nitrogen gas remaining between the interlock valve group 50 and the gas engine 102.

[0107] S217. When the third pressure signal is equal to zero, the pressure regulating module is shut down.

[0108] Specifically, when the control module 70 detects that the pressure signal output by the third pressure sensing unit 603 is zero, it indicates that the nitrogen gas remaining between the interlock valve assembly 50 and the gas engine 102 has been purged. At this time, the control module 70 controls the pressure regulating module 80 to close. By eliminating interference from impurities in the pipeline, the sealing accuracy of the interlock valve assembly 50 is ensured.

[0109] S218. Control the first pressure sensing unit to detect the first pressure signal of the first shut-off valve, the second pressure sensing unit to detect the second pressure signal of the vent valve, and the third pressure sensing unit to detect the third pressure signal of the second shut-off valve.

[0110] Specifically, after a period of pressure holding (e.g., 5 minutes), the control module 70 performs a sealing test on the interlock valve assembly 50 by comparing the changes in the pressure signals output by the first pressure sensing unit 601, the second pressure sensing unit 602, and the third pressure sensing unit 603.

[0111] S219. When the second pressure signal is equal to the preset pressure and both the first and third pressure signals are equal to zero, it is determined that the interlock valve group has no leakage.

[0112] Specifically, when the control module 70 detects that the second pressure signal is always equal to the preset pressure, and the first pressure signal and the third pressure signal are always equal to zero, it determines that the interlock valve group 50 has no leakage.

[0113] S220. When the second pressure signal is less than the preset pressure, the first pressure signal is greater than zero, and the third pressure signal is equal to zero, the first shut-off valve is determined to be in a leakage state.

[0114] Specifically, when the control module 70 detects that the second pressure signal is less than the preset pressure (i.e., the reading of the second pressure sensing unit 602 decreases), the first pressure signal is greater than zero (i.e., the reading of the first pressure sensing unit 601 increases), and the third pressure signal is equal to zero, it determines that the first shut-off valve 501 is in a leaking state. At this time, the control module 70 outputs that the first shut-off valve 501 is leaking, reminding the staff to take timely maintenance measures to improve the safety of the gas engine control system.

[0115] S221. When the second pressure signal is less than the preset pressure, the first pressure signal is equal to zero, and the third pressure signal is greater than zero, the second shut-off valve is determined to be in a leaking state.

[0116] Specifically, when the control module 70 detects that the second pressure signal is less than the preset pressure (i.e., the reading of the second pressure sensing unit 602 decreases), the first pressure signal is equal to zero, and the third pressure signal is greater than zero (i.e., the reading of the third pressure sensing unit 603 increases), it determines that the second shut-off valve 502 is in a leaking state. At this time, the control module 70 outputs that the second shut-off valve 502 is leaking, reminding the staff to take timely maintenance measures to improve the safety of the gas engine control system.

[0117] S222. When the second pressure signal is less than the preset pressure and both the first and third pressure signals are equal to zero, the vent valve is determined to be in a leaking state.

[0118] Specifically, when the control module 70 detects that the second pressure signal is less than the preset pressure (i.e., the reading of the second pressure sensing unit 602 decreases), and both the first and third pressure signals are equal to zero, it determines that the vent valve 503 is in a leaking state. At this time, the control module 70 outputs that the vent valve 503 is leaking, reminding the staff to take timely maintenance measures to improve the safety of the gas engine control system.

[0119] The gas engine control system provided in the embodiments of the present invention can execute the sealing detection method of the gas engine control system provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0120] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0121] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A control system for a gas engine, characterized in that, include: Input branch, output branch, pre-charge branch, first branch, interlock valve group, pressure detection module and control module; The input branch connects the gas inlet and the gas engine; the output branch connects the gas engine and the gas outlet; the interlock valve group is disposed on the input branch and on the first branch, the first branch being used to connect the input branch and the output branch; The pressure detection module is located on the branch where the interlock valve group is located; the pressure detection module is used to detect the pressure of the interlock valve group and generate a pressure signal; The pre-charge branch is connected to the pre-charge inlet and the gas inlet via the interlock valve group; The pre-charge branch is used to inject gas at a preset pressure into the interlock valve group through the pre-charge air inlet during the pre-charge stage; The control module is connected to the pressure detection module; The control module is used to determine the sealing performance of the interlock valve assembly based on the pressure signal during the detection phase. The interlock valve assembly includes a first shut-off valve, a second shut-off valve, and a vent valve; the pressure detection module includes a first pressure sensing unit, a second pressure sensing unit, and a third pressure sensing unit. The first pressure sensing unit, the first shut-off valve, the second shut-off valve, and the third pressure sensing unit are sequentially disposed on the input branch. The second pressure sensing unit and the vent valve are sequentially disposed on the first branch. The second pressure sensing unit is disposed on the side of the vent valve closer to the input branch. The control module is connected to the first shut-off valve, the second shut-off valve, the vent valve, the first pressure sensing unit, the second pressure sensing unit, and the third pressure sensing unit. The first pressure sensing unit is used to detect the first pressure signal of the first shut-off valve, the second pressure sensing unit is used to detect the second pressure signal of the vent valve, and the third pressure sensing unit is used to detect the third pressure signal of the second shut-off valve. The control module is used to determine that the interlock valve group has no leakage when the second pressure signal is equal to the preset pressure and the first pressure signal and the third pressure signal are both equal to zero during the detection phase. The control module is also used to determine that the first shut-off valve is in a leaking state when the second pressure signal is less than the preset pressure, the first pressure signal is greater than zero, and the third pressure signal is equal to zero during the detection phase. The control module is also used to determine that the second shut-off valve is in a leaking state when the second pressure signal is less than the preset pressure, the first pressure signal is equal to zero, and the third pressure signal is greater than zero during the detection phase. The control module is also used to determine that the vent valve is in a leaking state when the second pressure signal is less than the preset pressure and both the first pressure signal and the third pressure signal are equal to zero during the detection phase.

2. The control system for the gas engine according to claim 1, characterized in that, Also includes: A pre-charged gas purge valve; the pre-charged gas purge valve is located on the pre-charged branch; the pre-charged gas purge valve is connected to the control module; The control module is also used to control the opening of the pre-charge gas purge valve and the second shut-off valve, and the closing of the vent valve, before the pre-charge stage; The control module is also used to control the pre-charge gas purge valve and the second shut-off valve to close when the second pressure signal and the third pressure signal are both equal to the preset pressure after the pre-charge stage and before the detection stage.

3. The control system for the gas engine according to claim 1, characterized in that, Also includes: A pressure regulating module and a venting module; the pressure regulating module is located on the input branch and on the side of the interlock valve group closer to the gas engine, and the venting module is located on the output branch; both the pressure regulating module and the venting module are connected to the control module; The pressure regulating module and the venting module are used to vent the gas in the input branch, the output branch and the first branch before the pre-charge stage; The pressure regulating module and the venting module are also used to vent the gas between the interlock valve group and the gas engine after the pre-charge stage.

4. The control system for the gas engine according to claim 1, characterized in that, Also includes: First valve; The first valve is located in the input branch and between the gas inlet and the interlock valve assembly; The first valve is used to control the connection status of the branch between the gas inlet and the interlock valve group.

5. A method for testing the sealing performance of a gas engine control system, characterized in that, The control system of the gas engine includes an input branch, an output branch, a pre-charge branch, a first branch, an interlock valve assembly, a pressure detection module, and a control module. The input branch connects the gas inlet and the gas engine. The output branch connects the gas engine and the gas outlet. The interlock valve assembly is located on the input branch and on the first branch, with the first branch connecting the input branch and the output branch. The pressure detection module is located on the branch containing the interlock valve assembly. The pre-charge branch connects the pre-charge inlet and the gas inlet via the interlock valve assembly. The control module is connected to the pressure detection module; The sealing test method for the control system of the gas engine includes: During the pre-charge phase, the pre-charge branch is controlled to inject gas at a preset pressure into the interlock valve assembly through the pre-charge air inlet; During the detection phase, after the pressure detection module detects the pressure of the interlock valve group, the sealing performance of the interlock valve group is determined based on the pressure signal provided by the pressure detection module. The interlock valve assembly includes a first shut-off valve, a second shut-off valve, and a vent valve; the pressure detection module includes a first pressure sensing unit, a second pressure sensing unit, and a third pressure sensing unit. The first pressure sensing unit, the first shut-off valve, the second shut-off valve, and the third pressure sensing unit are sequentially disposed on the input branch. The second pressure sensing unit and the vent valve are sequentially disposed on the first branch. The second pressure sensing unit is disposed on the side of the vent valve closer to the input branch. The control module is connected to the first shut-off valve, the second shut-off valve, the vent valve, the first pressure sensing unit, the second pressure sensing unit, and the third pressure sensing unit. During the detection phase, after the pressure detection module detects the pressure of the interlock valve assembly, the sealing performance of the interlock valve assembly is determined based on the pressure signal provided by the pressure detection module, including: The first pressure sensing unit is controlled to detect the first pressure signal of the first shut-off valve, the second pressure sensing unit is controlled to detect the second pressure signal of the vent valve, and the third pressure sensing unit is controlled to detect the third pressure signal of the second shut-off valve. The interlock valve assembly is determined to be leak-free when the second pressure signal is equal to the preset pressure and both the first pressure signal and the third pressure signal are equal to zero. When the second pressure signal is less than the preset pressure, the first pressure signal is greater than zero, and the third pressure signal is equal to zero, the first shut-off valve is determined to be in a leaking state. When the second pressure signal is less than the preset pressure, the first pressure signal is equal to zero, and the third pressure signal is greater than zero, the second shut-off valve is determined to be in a leaking state. The vent valve is determined to be in a leaking state when the second pressure signal is less than the preset pressure and both the first pressure signal and the third pressure signal are equal to zero.

6. The method for testing the sealing performance of a gas engine control system according to claim 5, characterized in that, The control system of the gas engine also includes a pre-charge gas purge valve; the pre-charge gas purge valve is located on the pre-charge branch; the pre-charge gas purge valve is connected to the control module; before the pre-charge stage, it also includes: The pre-charged gas purge valve and the second shut-off valve are opened, and the vent valve is closed; The process includes the following steps after the pre-charging phase and before the detection phase: When the second pressure signal and the third pressure signal are equal to the preset pressure, the pre-charge gas purge valve and the second shut-off valve are controlled to close.

7. The method for testing the sealing performance of a gas engine control system according to claim 6, characterized in that, The control system of the gas engine also includes a pressure regulating module and a venting module; the pressure regulating module is located on the input branch and on the side of the interlock valve group closer to the gas engine, and the venting module is located on the output branch; Both the voltage regulating module and the venting module are connected to the control module; Prior to the detection phase, the following is also included: Control the voltage regulating module and the discharge module to turn on; When the third pressure signal is equal to zero, the pressure regulating module is controlled to shut down. Prior to the pre-charge phase, the following is also included: The first shut-off valve, the second shut-off valve, the vent valve, the pressure regulating module, and the venting module are all in the open state. When the first pressure signal, the second pressure signal, and the third pressure signal are all equal to zero, the first shut-off valve, the second shut-off valve, the vent valve, the pressure regulating module, and the venting module are all controlled to be in the closed state.

8. The method for testing the sealing performance of a gas engine control system according to claim 5, characterized in that, The control system of the gas engine also includes a first valve; the first valve is located in the input branch and between the gas inlet and the interlock valve group; Prior to the pre-charge phase, the following is also included: The gas engine is controlled to be in a stopped state and the first valve is in a closed state.

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