Control system of gas engine and sealing performance detection method thereof

Abstract

The embodiment of the invention discloses a control system of a gas engine and a sealing performance detection method of the control system. 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 the gas inlet and the gas engine; the output branch is communicated with the gas engine and the 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 with 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 a fuel gas inlet through an interlocking valve group; the pre-charging branch injects gas with preset pressure into the interlocking valve group through the pre-charging gas inlet in the pre-charging stage; and the control module determines the sealing performance of the interlocking valve group according to the pressure signal in the detection stage. Whether the interlocking valve group leaks or not can be judged, the leakage position is accurately positioned, maintenance measures can be rapidly taken, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas engines, and in particular to a gas engine control system and a sealing detection method thereof. Background Art

[0002] Gas engines primarily use gases such as ammonia and methane as fuel, which are delivered to the cylinders via a gas supply line for combustion. To ensure safe operation, an interlock valve group is installed in the engine's gas line. In the event of a gas supply outage or a safety malfunction, the interlock valve group receives instructions from the engine controller to automatically close two series-connected shutoff valves and simultaneously open a third valve to release the gas between the two series-connected shutoff valves. If the interlock valve group fails to seal, gas can leak into the downstream pipeline, posing a serious threat to the safety of the gas engine. Therefore, testing the interlock valve group for leaks is essential.

[0003] At present, the interlocking valve group with valve position feedback is driven by the engine controller to output an electrical signal to drive the valve body to be energized and de-energized, and then perform closing and opening actions. The position sensor installed on the valve monitors the valve position in real time and feeds back the signal to the engine controller to realize the monitoring of the opening and closing status of the valve.

[0004] When the interlock valve group is working, it is necessary to ensure that the sealing surface of the valve body and the valve core are tightly fitted each time it is closed to achieve a good seal. However, due to long-term gas erosion and frequent switching between power on and power off, the sealing surface will be worn, scratched or deformed due to friction and erosion, resulting in a decrease in sealing performance. In addition, the gas that has passed through the fine filter still contains impurities. These impurities will be deposited inside the valve body, especially in key areas such as the valve core and valve seat, preventing the interlock valve group from sealing tightly. Therefore, the interlock valve group is prone to seal failure after long-term use, causing gas to leak into the downstream pipeline or surrounding space. However, the valve position feedback signal still normally displays the open and closed status, causing the operator to misjudge that the valve group is working normally and there is no risk of leakage. Therefore, relying solely on the valve position feedback signal to judge the sealing of the interlock valve group poses a safety hazard. Summary of the Invention

[0005] The present invention provides a gas engine control system and a sealing detection method thereof, so as to determine whether an interlocking valve group is leaking, accurately locate the leakage position, 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 for the gas engine comprising: an input branch, an output branch, a pre-charge branch, a first branch, an interlocking valve group, a pressure detection module, and a control module;

[0007] The input branch is connected to the gas inlet and the gas engine; the output branch is connected to the gas engine and the gas outlet; the interlock valve group is arranged on the input branch and on the first branch, and the first branch is used to connect the input branch and the output branch;

[0008] The pressure detection module is arranged 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 form a pressure signal;

[0009] The pre-charge branch is connected to the pre-charge air inlet and the gas inlet through an interlocking valve group;

[0010] The pre-charging branch is used to inject gas of preset pressure into the interlocking valve group through the pre-charging air inlet during the pre-charging 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 group according to the pressure signal during the detection phase.

[0013] Optionally, the interlock valve group includes a first stop valve, a second stop valve and a breathable 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 stop valve, the second stop 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, and the second pressure sensing unit is arranged on a side of the vent valve close to the input branch; the control module is connected to the first stop valve, the second stop 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 a first pressure signal of the first stop valve, the second pressure sensing unit is used to detect a second pressure signal of the breathable valve, and the third pressure sensing unit is used to detect a third pressure signal of the second stop valve;

[0016] 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;

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

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

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

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

[0021] The control module is also used to control the pre-filling gas purge valve and the second stop valve to open and the vent valve to close before the pre-filling stage;

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

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

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

[0025] The pressure regulating module and the bleed module are also used to evacuate the gas between the interlock valve group and the gas engine after the pre-charge stage.

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

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

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

[0029] According to another aspect of the present invention, a method for detecting the sealing performance of a control system of a gas engine is provided. The control system of the gas engine includes 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. 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 provided 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 provided on the branch where the interlock valve group is located. The pre-charge branch connects the pre-charge inlet and the gas inlet via the interlock valve group. The control module is connected to the pressure detection module.

[0030] The gas engine control system sealing detection method includes:

[0031] During the pre-charging stage, the pre-charging branch is controlled to inject gas of preset pressure into the interlocking valve group through the pre-charging air inlet;

[0032] During the detection phase, after the pressure detection module is controlled to detect 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 group includes a first stop valve, a second stop valve and a breathable 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 stop valve, the second stop 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, and the second pressure sensing unit is arranged on a side of the vent valve close to the input branch; the control module is connected to the first stop valve, the second stop valve, the vent valve, the first pressure sensing unit, the second pressure sensing unit, and the third pressure sensing unit;

[0035] 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, including:

[0036] Controlling the first pressure sensing unit to detect a first pressure signal of the first shut-off valve, the second pressure sensing unit to detect a second pressure signal of the vent valve, and the third pressure sensing unit to detect a third pressure signal of the second shut-off valve;

[0037] Determining 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;

[0038] Determining that the first stop valve is in a leaking state when the second pressure signal is less than a preset pressure, the first pressure signal is greater than zero, and the third pressure signal is equal to zero;

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

[0040] When the second pressure signal is less than a preset pressure and the first pressure signal and the third pressure signal are both equal to zero, it is determined that the vent valve is in a leakage state.

[0041] Optionally, the control system of the gas engine further 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; and before the pre-charge stage, the control system further includes:

[0042] Control the pre-filled gas purge valve and the second stop valve to open, and the vent valve to close;

[0043] After the priming phase and before the detection phase, it also includes:

[0044] When the second pressure signal and the third pressure signal are equal to the preset pressure, the pre-filled gas purge valve and the second stop valve are controlled to be closed.

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

[0046] Before the detection phase, it also includes:

[0047] Control the pressure regulating module and the discharge module to open;

[0048] When the third pressure signal is equal to zero, the pressure regulating module is controlled to be closed;

[0049] Before the pre-charge phase, it also includes:

[0050] Control the first stop valve, the second stop valve, the vent valve, the pressure regulating module and the discharge module to be 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 stop valve, the second stop valve, the vent valve, the pressure regulating module and the relief module are all controlled to be in a closed state.

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

[0053] Before the pre-charge phase, it also includes:

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

[0055] The technical solution of the embodiment of the present invention is to set up a control system for a gas engine, wherein the interlock valve group is arranged on the input branch and on the first branch, and the first branch connects the input branch and the output branch; the pressure detection module is arranged on the branch where the interlock valve group is located; the pressure detection module detects the pressure of the interlock valve group and forms a pressure signal to be transmitted to the control module, and the pre-filling branch injects gas of preset pressure into the interlock valve group through the pre-filling inlet during the pre-filling stage. During the detection stage, the control module determines the sealing of the interlock valve group by comparing the changes in the readings of the front end, rear end and internal pressure detection module of the interlock valve group. It can determine whether the sealing of the interlock valve group has failed in a short time. If the interlock valve group leaks, the position of the leak can be quickly located, which is convenient for the staff to quickly take maintenance measures, eliminate safety hazards, and improve the efficiency of sealing detection of the interlock valve group.

[0056] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0059] Figure 2 is a schematic structural diagram of another gas engine control system provided in an embodiment of the present invention;

[0060] Figure 3 This is a flow chart of a method for detecting the sealing performance of a control system of a gas engine provided in an embodiment of the present invention;

[0061] Figure 4 The present invention is a flowchart of another method for detecting the sealing performance of a control system of a gas engine provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0062] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0063] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0064] To address the problem in the prior art that the technical solution of judging the sealing performance of an interlocking valve group by a single valve position feedback signal cannot reflect the actual sealing status, the embodiments of the present invention provide the following technical solutions:

[0065] Figure 1 FIG. 1 is a schematic diagram of a control system for a gas engine 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 interlocking valve group 50, a pressure detection module 60 and a control module 70; the input branch 10 is connected to the gas inlet 101 and the gas engine 102; the output branch 20 is connected to the gas engine 102 and the gas outlet 103; the interlocking valve group 50 is arranged on the input branch 10, and is arranged on the first branch 40, and the first branch 40 is used to connect the input branch 10 and the output branch 20; the pressure detection module 60 is connected to ... The detection module 60 is arranged on the branch where the interlock valve group 50 is located; the pressure detection module 60 is used to detect the pressure of the interlock valve group 50 and form a pressure signal; the pre-filling branch 30 is connected to the pre-filling air inlet 301 and the gas inlet 101 through the interlocking valve group 50; the pre-filling branch 30 is used to inject gas of preset pressure into the interlocking valve group 50 through the pre-filling air inlet 301 during the pre-filling stage; the control module 70 is connected to the pressure detection module 60; the control module 70 is used to determine the sealing of the interlocking valve group 50 according to the pressure signal during the detection stage.

[0066] In this embodiment of the present invention, the input branch 10 is a gas input pipeline. The output branch 20 can be a gas output pipeline or a nitrogen output pipeline. The pre-fill branch 30 is a nitrogen input pipeline used during the pre-fill phase, before the interlock valve assembly 50 is tested for leaks. A first branch 40 connects the input branch 10 and the output branch 20. When the gas engine control system shuts off the gas supply or a safety malfunction occurs, gas in the pipeline is released through the first branch 40 and the output branch 20. The interlock valve assembly 50 can be composed of two shutoff valves connected in series to the input branch 10 and a third valve that releases pressure in the pipeline between the two shutoff valves. When the gas supply is shut off or a safety malfunction occurs, the interlock valve assembly 50 receives a command from the control module 70 and automatically closes the two series-connected shutoff valves. Simultaneously, the third valve automatically opens, releasing gas between the two series-connected shutoff valves. The control module 70 is connected to the pressure detection module 60, which detects the pressure in the interlock valve assembly 50 and transmits a pressure signal to the 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 may be a pressure sensor. The control module 70 may be a gas engine controller.

[0067] In the gas engine control system, gas enters gas engine 102 after passing through interlock valve block 50. Control module 70 controls the opening and closing of interlock valve block 50 and other valves in the pipeline. Pressure detection modules 60, located at the front, rear, and interior of interlock valve block 50, also monitor the gas pipeline pressure in real time. Nitrogen purge and gas exhaust lines are also provided. In the event of an abnormality or shutdown of gas engine 102, nitrogen is used to purge residual gas from the pipelines, preventing safety risks associated with gas accumulation.

[0068] Before testing the sealability of the interlock valve assembly 50, the gas engine 102 is shut down and the gas inlet 101 is cleared. The control module 70 then automatically executes the interlock valve assembly 50 sealability test process: First, the interlock valve assembly 50 and other valves are opened to evacuate the gas from the input branch 10 and output branch 20. The interlock valve assembly 50 and other valves are then closed. Gas is then injected into the interlock valve assembly 50 via the pre-fill branch 30 to a preset pressure. 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 via the pre-fill branch 30. Once the control module 70 detects that the readings from the interlock valve assembly 50 and the rear-end pressure detection module 60 are consistent, or the difference between the readings from the interlock valve assembly 50 and the rear-end pressure detection module 60 is within the tolerance range, gas injection into the interlock valve assembly 50 is stopped, and the gas at the rear end of the interlock valve assembly 50 is evacuated via the output branch 20. Finally, the pressure is maintained for a preset time, illustratively, 5 minutes. After 5 minutes of pressure maintenance, the control module 70 determines the sealing performance of each valve within the interlock valve group 50 by comparing the changes in the readings of the front and rear ends of the interlock valve group 50 and the internal pressure detection module 60 during the pressure maintenance process. For example, during the pressure maintenance process, if the control module 70 detects that the readings of the pressure detection module 60 within the interlock valve group 50 remain unchanged, and the readings of the pressure detection modules 60 at the front and rear ends of the interlock valve group 50 are zero, it indicates that there is no leakage in each valve of the interlock valve group 50, and the control module 70 outputs that the interlock valve group 50 is leaking. In addition, if the pressure detection module 60 at the front end of the interlock valve group 50 shows an increase, the pressure detection module 60 on the first branch 40 shows a decrease, and the pressure detection module 60 at the rear end of the interlock valve group 50 shows an unchanged value, it can be determined that the valve at the front end of the interlock valve group 50 is leaking; if the pressure detection module 60 at the front end of the interlock valve group 50 shows an unchanged value, the pressure detection module 60 on the first branch 40 shows a decrease, and the pressure detection module 60 at the rear end of the interlock valve group 50 shows an increase, it can be determined that the valve at the rear end of the interlock valve group 50 is leaking; if the pressure detection module 60 at the front end of the interlock valve group 50 shows an unchanged value, the pressure detection module 60 on the first branch 40 shows a decrease, and the pressure detection module 60 at the rear end of the interlock valve group 50 shows an unchanged value, it can be determined that the valve located on the first branch 40 in the interlock valve group 50 is leaking. By applying the technical solution of the embodiment of the present invention, it is possible to determine in a short time whether the sealing of the interlock valve group 50 has failed. If the interlock valve group 50 leaks, the position of the leak can be quickly located, which facilitates the staff to quickly take maintenance measures, eliminate safety hazards, and improve the efficiency of sealing detection of the interlock valve group 50.

[0069] The technical solution of the embodiment of the present invention is to set up a control system for a gas engine, wherein the interlock valve group is arranged on the input branch and on the first branch, and the first branch connects the input branch and the output branch; the pressure detection module is arranged on the branch where the interlock valve group is located; the pressure detection module detects the pressure of the interlock valve group and forms a pressure signal to be transmitted to the control module, and the pre-filling branch injects gas of preset pressure into the interlock valve group through the pre-filling inlet during the pre-filling stage. During the detection stage, the control module determines the sealing of the interlock valve group by comparing the changes in the readings of the front end, rear end and internal pressure detection module of the interlock valve group. It can determine whether the sealing of the interlock valve group has failed in a short time. If the interlock valve group leaks, the position of the leak can be quickly located, which is convenient for the staff to quickly take maintenance measures, eliminate safety hazards, and improve the efficiency of sealing detection of the interlock valve group.

[0070] Figure 2 FIG is a structural diagram of another gas engine control system provided according to an embodiment of the present invention. Figure 2 , the interlock valve group 50 includes a first stop valve 501, a second stop valve 502 and a breathable 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 stop valve 501, the second stop valve 502 and the third pressure sensing unit 603 are sequentially arranged on the input branch 10, the second pressure sensing unit 602 and the breathable valve 503 are sequentially arranged on the first branch 40, and the second pressure sensing unit 602 is arranged on the side of the breathable valve 503 close to the input branch 10; the control module 70 is connected to the first stop valve 501, the second stop valve 502, the breathable 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 stop valve 501, the second pressure sensing unit 602 is used to detect the first pressure signal of the second stop valve 501, and the second pressure sensing unit 602 is used to detect the first pressure signal of the second stop valve 501. The sensing unit 602 is used to detect the second pressure signal of the ventilation valve 503, and the third pressure sensing unit 603 is used to detect the third pressure signal of the second stop 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 the first pressure signal and the third pressure signal are both equal to zero during the detection stage; the control module 70 is also used to determine that the first stop 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 stage; the control module 70 is also used to determine that the second stop 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 stage; the control module 70 is also used to determine that the ventilation valve 503 is in a leakage state when the second pressure signal is less than the preset pressure and the first pressure signal and the third pressure signal are both equal to zero during the detection stage.

[0071] In an embodiment of the present 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 arranged on the input branch 10, while the second pressure sensing unit 602 and the vent valve 503 are sequentially arranged on the first branch 40. The first shut-off valve 501 is used to control the flow of fluid in the input branch 10. The second shut-off valve 502 is connected in series with the first shut-off valve 501. The vent valve 503 is arranged on the first branch 40 for balancing pressure or releasing gas. The first pressure sensing unit 601 detects a first pressure signal from the first shut-off valve 501, the second pressure sensing unit 602 detects a second pressure signal from the vent valve 503, and the third pressure sensing unit 603 detects a third pressure signal from the second shut-off valve 502. In the control system of the gas engine, the control module 70 can perform a leak detection of the interlock valve group 50 by comparing the changes in the first pressure signal, the second pressure signal, and the third pressure signal. After the pre-filling stage and before the detection stage, nitrogen is injected into the interlock valve group 50, and the second pressure sensing unit 602 has a reading, that is, the second pressure signal is equal to the preset pressure (such as 6 bar); at this time, the front end of the interlock valve group 50 is in a closed state due to the first stop valve 501 being in a closed state during the nitrogen injection process, and the corresponding first pressure sensing unit 601 reading is 0; and the rear end of the interlock valve group 50 is also 0 because the gas in the pipeline is evacuated after the nitrogen injection process.

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

[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 is determined 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 is determined that the first stop valve 501 is in a leakage state. At this time, the control module 70 outputs that the first stop valve 501 is leaking, reminding the staff to take maintenance measures in time, thereby improving the safety of the control system of the gas engine.

[0075] (3) When the control module 70 detects that the second pressure signal is less than the preset pressure (i.e., the indication 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 indication of the third pressure sensing unit 603 increases), it is determined that the second stop valve 502 is in a leakage state. At this time, the control module 70 outputs that the second stop valve 502 is leaking, reminding the staff to take maintenance measures in time, thereby improving the safety of the control system of the gas engine.

[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 decreases), and the first pressure signal and the third pressure signal are both equal to zero, it is determined 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 maintenance measures in time, thereby improving the safety of the control system of the gas engine.

[0077] In an optional embodiment of the present invention, reference Figure 2 The control system of the gas engine also includes: a pre-filling gas purge valve 302; the pre-filling gas purge valve 302 is located on the pre-filling branch 30; the pre-filling gas purge valve 302 is connected to the control module 70; the control module 70 is also used to control the pre-filling gas purge valve 302 and the second stop valve 502 to open and the breather valve 503 to close before the pre-filling stage; the control module 70 is also used to control the pre-filling gas purge valve 302 and the second stop valve 502 to close after the pre-filling 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 an embodiment of the present invention, the pre-filling gas purge valve 302 may be a nitrogen purge valve. Before the pre-filling stage, the control module 70 controls the pre-filling gas purge valve 302 and the second stop valve 502 to be opened, and the breathable valve 503 to be closed, and nitrogen of a preset pressure (such as 6 bar) is injected from the pre-filling air inlet 301 through the pre-filling branch 30 into the interlocking valve group 50. When the control module 70 detects that the second pressure signal and the third pressure signal are both equal to the preset pressure (such as 6 bar), it controls the pre-filling gas purge valve 302 and the second stop valve 502 to be closed. The pre-filling stage can exclude air and impurities to ensure the purity of the system. As an inert gas, nitrogen can replace the air inside the interlocking valve group 50 and in the pipeline to avoid the mixing of residual oxygen and flammable and explosive gases to cause safety hazards. At the same time, impurities such as dust and oil in the pipeline are taken away through the purging effect of the nitrogen. By pre-filling the gas, a reference pressure can be established for the subsequent sealing detection of the interlock valve group 50, the sealing detection logic of the interlock valve group 50 can be optimized, and the reliability of the sealing detection of the interlock valve group 50 can be improved.

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

[0080] In an embodiment of the present invention, the pressure regulating module 80 may be a pressure regulating valve. The discharge module 90 may 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 discharge module 90 at the end of the gas engine 102 to be in the open state, thereby evacuating the gas from 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 evacuated. The control module 70 then controls the first shut-off valve 501, the second shut-off valve 502, the vent valve 503, the pressure regulating module 80, and the discharge module 90 at the end of the gas engine 102 to be in the closed state. This clears the residual gas in the pipeline to avoid safety hazards. The control module 70 then controls the pre-fill gas purge valve 302 and the second shut-off valve 502 to open, the vent valve 503 to close, and nitrogen at a preset pressure (e.g., 6 bar) is injected from the pre-fill gas inlet 301 through the pre-fill 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), the pre-fill gas purge valve 302 and the second shut-off valve 502 are closed.

[0081] After the control module 70 controls the pre-filled 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 bleed module 90 to be in the open state to evacuate the nitrogen remaining between the interlock valve group 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 group 50 and the gas engine 102 has been evacuated. At this time, the control module 70 controls the pressure regulating module 80 to close. After maintaining the pressure for a period of time (such as 5 minutes), the control module 70 performs a sealing test on the interlock valve group 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 the interference of impurities in the pipeline, the sealing test accuracy of the interlock valve group 50 is guaranteed.

[0082] In an optional embodiment of the present invention, reference 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 is located between the gas inlet 101 and the interlock valve group 50; the first valve 104 is used to control the connectivity state of the branch between the gas inlet 101 and the interlock valve group 50.

[0083] In this embodiment of the present 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 leak test on the interlock valve assembly 50, it is necessary to ensure that the gas engine 102 is shut down and the first valve 104 at the gas inlet 101 is closed. This prevents the gas engine 102 from accidentally starting up, potentially causing mechanical damage to monitoring equipment or maintenance personnel, and avoids safety risks associated with gas leaks.

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

[0085] Figure 3 This is a flow chart of a method for detecting the sealing performance of a gas engine control system according to an embodiment of the present invention. This embodiment is applicable to detecting the sealing performance of a gas engine control system. The method for detecting the sealing performance of a gas engine control system can be executed by the gas engine control system. Figure 1 The control system of the gas engine includes an input branch 10, an output branch 20, a pre-filling branch 30, a first branch 40, an interlocking valve group 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 interlocking valve group 50 is arranged on the input branch 10, and on the first branch 40, and the first branch 40 is used to connect the input branch 10 and the output branch 20; the pressure detection module 60 is arranged on the branch where the interlocking valve group 50 is located; the pre-filling branch 30 connects the pre-filling air inlet 301 and the gas inlet 101 through the interlocking valve group 50; the control module 70 is connected to the pressure detection module 60. Figure 3As shown, the sealing detection method of the control system of the gas engine includes:

[0086] S110 , in the pre-charging stage, controlling the pre-charging branch to inject gas of a preset pressure into the interlocking valve group through the pre-charging air inlet.

[0087] Specifically, refer to Figure 1 Before testing the seal of the interlock valve assembly 50, the gas engine 102 is shut down and the gas inlet 101 is cleared. The control module 70 then automatically executes the interlock valve assembly 50 seal test process: First, the interlock valve assembly 50 and other valves are opened to evacuate the gas from the input branch 10 and output branch 20. The interlock valve assembly 50 and other valves are then closed. Gas is then injected into the interlock valve assembly 50 via the pre-fill branch 30 to a preset pressure. For example, the preset pressure is 6 bar, and the injected gas is nitrogen. Six bar of nitrogen is injected into the interlock valve assembly 50 via the pre-fill branch 30. Once the control module 70 detects that the readings inside the interlock valve assembly 50 are consistent with those from the rear-end pressure detection module 60, or that the difference between the readings from the interlock valve assembly 50 and the rear-end pressure detection module 60 is within the tolerance range, gas injection into the interlock valve assembly 50 is stopped, and the gas at the rear end of the interlock valve assembly 50 is evacuated via the output branch 20.

[0088] S120 , in the detection phase, after controlling the pressure detection module to detect the pressure of the interlock valve group, determine the sealing performance of the interlock valve group according to the pressure signal provided by the pressure detection module.

[0089] Specifically, during the testing phase, the pressure is maintained for a preset time, illustratively, 5 minutes. After 5 minutes of pressure maintenance, the control module 70 determines the sealing properties of each valve within the interlock valve group 50 by comparing changes in the pressure signals provided by the pressure detection module 60 at the front and rear ends of the interlock valve group 50 and within the interlock valve group 50 during the pressure maintenance process. For example, during the pressure maintenance process, if the control module 70 detects that the readings of the pressure detection module 60 within the interlock valve group 50 remain unchanged, and the readings of the pressure detection modules 60 at the front and rear ends of the interlock valve group 50 are zero, then it indicates that none of the valves in the interlock valve group 50 are leaking, and the control module 70 outputs a signal that the interlock valve group 50 is leaking. In addition, if the pressure detection module 60 at the front end of the interlock valve group 50 shows an increase, the pressure detection module 60 on the first branch 40 shows a decrease, and the pressure detection module 60 at the rear end of the interlock valve group 50 shows an unchanged value, it can be determined that the valve at the front end of the interlock valve group 50 is leaking; if the pressure detection module 60 at the front end of the interlock valve group 50 shows an unchanged value, the pressure detection module 60 on the first branch 40 shows a decrease, and the pressure detection module 60 at the rear end of the interlock valve group 50 shows an increase, it can be determined that the valve at the rear end of the interlock valve group 50 is leaking; if the pressure detection module 60 at the front end of the interlock valve group 50 shows an unchanged value, the pressure detection module 60 on the first branch 40 shows a decrease, and the pressure detection module 60 at the rear end of the interlock valve group 50 shows an unchanged value, it can be determined that the valve located on the first branch 40 in the interlock valve group 50 is leaking.

[0090] The technical solution of the embodiment of the present invention is to set up a sealing detection method for the control system of the gas engine. In the pre-charging stage, the pre-charging branch is controlled to inject gas of preset pressure into the interlocking valve group through the pre-charging air inlet. In the detection stage, after the pressure detection module is controlled to detect the pressure of the interlocking valve group, the sealing of the interlocking valve group is determined according to the pressure signal provided by the pressure detection module. It can be determined in a short time whether the sealing of the interlocking valve group has failed. If the interlocking valve group leaks, the position of the leak can be quickly located, which is convenient for the staff to quickly take maintenance measures, eliminate safety hazards, and improve the sealing detection efficiency of the interlocking valve group.

[0091] Figure 4 This is a flow chart of another method for detecting the sealing performance of a control system of a gas engine according to an embodiment of the present invention. This embodiment is a detailed description of the technical features of the above embodiment. Figure 2The interlocking valve group 50 includes a first stop valve 501, a second stop valve 502 and a breathable 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 stop valve 501, the second stop valve 502 and the third pressure sensing unit 603 are sequentially arranged on the input branch 10, the second pressure sensing unit 602 and the breathable valve 503 are sequentially arranged on the first branch 40, and the second pressure sensing unit 602 is arranged on the side of the breathable valve 503 close to the input branch 10; the control module 70 is connected to the first stop valve 501, the second stop valve 502, the breathable 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 located on the pre-charge branch 30 and connected to the control module 70. The gas engine control system also includes a pressure regulating module 80 and a relief module 90. The pressure regulating module 80 is located on the input branch 10 and on the side of the interlock valve assembly 50 close to the gas engine 102. The relief module 90 is located on the output branch 20. Both the pressure regulating module 80 and the relief module 90 are connected to the control module 70. The gas engine control system also includes a first valve 104 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 detection method of the control system of the gas engine includes:

[0093] S210: Control the gas engine to be in a shutdown 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, thereby preventing the gas engine 102 from being started by mistake and causing mechanical damage to monitoring equipment or maintenance personnel, and avoiding safety risks caused by gas leakage.

[0095] S211, control the first stop valve, the second stop valve, the vent valve, the pressure regulating module and the discharge module to be in an open state.

[0096] Specifically, before the pre-charging stage, the control module 70 controls the first stop valve 501, the second stop valve 502, the vent valve 503, the pressure regulating module 80 and the discharge module 90 at the end of the gas engine 102 to be in the open state to exhaust 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 stop valve, the second stop valve, the vent valve, the pressure regulating module and the relief module are controlled to be in a 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 exhausted. The control module 70 then controls the first shut-off valve 501, the second shut-off valve 502, the vent valve 503, the pressure regulating module 80, and the bleed module 90 at the end of the gas engine 102 to be closed. This clears the residual gas in the pipeline and avoids safety hazards.

[0099] S213, control the pre-filled gas purge valve and the second stop valve to open, and the vent valve to close.

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

[0101] S214. In the pre-charging stage, the pre-charging branch is controlled to inject gas of a preset pressure into the interlocking valve group through the pre-charging air inlet.

[0102] Specifically, in the pre-charging stage, nitrogen gas at a preset pressure (eg, 6 bar) is injected from the pre-charging gas inlet 301 through the pre-charging branch 30 into the interlocking valve group 50 .

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

[0104] Specifically, when the control module 70 detects that the second pressure signal and the third pressure signal are both equal to a preset pressure (eg, 6 bar), the control module 70 controls the pre-filled gas purge valve 302 and the second stop valve 502 to close.

[0105] S216: Control the pressure regulating module and the discharge module to turn on.

[0106] Specifically, after the control module 70 controls the pre-filled 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 relief module 90 to be in an open state to exhaust the nitrogen remaining between the interlock valve group 50 and the gas engine 102.

[0107] S217 , when the third pressure signal is equal to zero, control the pressure regulating module to be closed.

[0108] Specifically, when the control module 70 detects that the pressure signal output by the third pressure sensing unit 603 is zero, indicating that the nitrogen between the interlock valve assembly 50 and the gas engine 102 has been exhausted, the control module 70 controls the pressure regulating module 80 to close. This eliminates interference from impurities in the pipeline, ensuring the accuracy of the sealing test of the interlock valve assembly 50.

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

[0110] Specifically, after maintaining pressure for a period of time (such as 5 minutes), the control module 70 performs a sealing test on the interlock valve group 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: 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.

[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 is determined that the interlock valve group 50 has no leakage.

[0113] S220 , determining that the first shut-off valve is in a leaking state when the second pressure signal is less than a preset pressure, the first pressure signal is greater than zero, and the third pressure signal is zero.

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

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

[0116] Specifically, when the control module 70 detects that the second pressure signal is less than the preset pressure (i.e., the indication 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 indication of the third pressure sensing unit 603 increases), it is determined that the second stop valve 502 is in a leakage state. At this time, the control module 70 outputs that the second stop valve 502 is leaking, reminding the staff to take maintenance measures in time to improve the safety of the control system of the gas engine.

[0117] S222: Determine that the vent valve is in a leaking state when the second pressure signal is less than a preset pressure and the first pressure signal and the third pressure signal are both equal to zero.

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

[0119] The gas engine control system provided in the embodiment 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 the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0121] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A gas engine control system, 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 is connected to the gas inlet and the gas engine; the output branch is connected to the gas engine and the gas outlet; the interlocking valve group is provided on the input branch and on the first branch, and the first branch is used to connect the input branch and the output branch; The pressure detection module is arranged on the branch where the interlocking valve group is located; the pressure detection module is used to detect the pressure of the interlocking valve group and generate a pressure signal; The pre-filling branch is connected to the pre-filling air inlet and the gas inlet through the interlocking valve group; The pre-filling branch is used to inject gas of preset pressure into the interlocking valve group through the pre-filling air inlet during the pre-filling 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 group according to the pressure signal during the detection phase.

2. The gas engine control system according to claim 1, characterized in that: The interlock valve group includes a first stop valve, a second stop valve and a breathable 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 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 arranged on a side of the vent valve close 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 a first pressure signal of the first shut-off valve, the second pressure sensing unit is used to detect a second pressure signal of the breathable valve, and the third pressure sensing unit is used to detect a third pressure signal of the second shut-off valve; The control module is configured to determine that the interlock valve group has no leakage when, during the detection phase, 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; The control module is further configured to determine, during the detection phase, 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 zero; The control module is further configured to determine, during the detection phase, 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 zero, and the third pressure signal is greater than zero; The control module is further configured to determine that the vent valve is in a leaking state when, during the detection phase, the second pressure signal is less than the preset pressure and the first pressure signal and the third pressure signal are both equal to zero.

3. The gas engine control system according to claim 2, characterized in that: Also includes: Pre-fill gas purge valve; the pre-fill gas purge valve is located on the pre-fill branch; the pre-fill gas purge valve is connected to the control module; The control module is further configured to control the pre-filling gas purge valve and the second shut-off valve to be opened and the vent valve to be closed before the pre-filling stage; The control module is further configured to control the pre-filling gas purge valve and the second shut-off valve to close after the pre-filling stage and before the detection stage when the second pressure signal and the third pressure signal are both equal to the preset pressure.

4. The gas engine control system according to claim 2, characterized in that: Also includes: A pressure regulating module and a discharge module; the pressure regulating module is located on the input branch and on the side of the interlocking valve group close to the gas engine, and the discharge module is located on the output branch; the pressure regulating module and the discharge module are both connected to the control module; The pressure regulating module and the discharge module are used to exhaust the gas in the input branch, the output branch and the first branch before the pre-charging stage; The pressure regulating module and the bleed module are further configured to exhaust the gas between the interlock valve group and the gas engine after the pre-charging stage.

5. The gas engine control system according to claim 1, characterized in that: Also includes: First valve; The first valve is located on the input branch and between the gas inlet and the interlock valve group; The first valve is used to control the communication state of the branch between the gas inlet and the interlocking valve group.

6. A method for detecting 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 group, 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 group is arranged on the input branch and on the first branch, and the first branch is used to connect the input branch and the output branch; the pressure detection module is arranged on the branch where the interlock valve group is located; the pre-charge branch connects the pre-charge inlet and the gas inlet through the interlock valve group; The control module is connected to the pressure detection module; The gas engine control system sealing detection method includes: During the pre-charging phase, the pre-charging branch is controlled to inject gas of a preset pressure into the interlocking valve group through the pre-charging air inlet; During the detection phase, after controlling the pressure detection module to detect the pressure of the interlock valve group, the sealing performance of the interlock valve group is determined according to the pressure signal provided by the pressure detection module.

7. The method for detecting the sealing performance of a gas engine control system according to claim 6, characterized in that: The interlock valve group includes a first stop valve, a second stop valve and a breathable 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 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 arranged on a side of the vent valve close 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; In the detection phase, after controlling the pressure detection module to detect the pressure of the interlock valve group, determining the sealing performance of the interlock valve group according to the pressure signal provided by the pressure detection module includes: controlling the first pressure sensing unit to detect a first pressure signal of the first shut-off valve, the second pressure sensing unit to detect a second pressure signal of the vent valve, and the third pressure sensing unit to detect a third pressure signal of the second shut-off valve; Determining 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; Determining 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 zero; Determining 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; The ventilation valve is determined to be in a leaking state when the second pressure signal is less than the preset pressure and the first pressure signal and the third pressure signal are both equal to zero.

8. The method for detecting the sealing performance of a control system of a gas engine according to claim 7, characterized in that: The control system of the gas engine further includes a pre-fill gas purge valve; the pre-fill gas purge valve is located on the pre-fill branch; the pre-fill gas purge valve is connected to the control module; and before the pre-fill stage, it also includes: Controlling the pre-filled gas purge valve and the second stop valve to open, and the vent valve to close; After the pre-charge phase and before the detection phase, the method further includes: When the second pressure signal and the third pressure signal are equal to the preset pressure, the pre-filled gas purge valve and the second shut-off valve are controlled to be closed.

9. The method for detecting the sealing performance of a control system of a gas engine according to claim 8, characterized in that: The control system of the gas engine further includes a pressure regulating module and a discharge module; the pressure regulating module is located on the input branch and on a side of the interlocking valve group close to the gas engine, and the discharge module is located on the output branch; The pressure regulating module and the discharge module are both connected to the control module; Before the detection phase, it also includes: Controlling the pressure regulating module and the discharge module to open; controlling the pressure regulating module to be closed when the third pressure signal is equal to zero; Before the pre-charge stage, the method further includes: Controlling the first stop valve, the second stop valve, the vent valve, the pressure regulating module and the discharge module to be in an open state; When the first pressure signal, the second pressure signal and the third pressure signal are all equal to zero, the first stop valve, the second stop valve, the vent valve, the pressure regulating module and the relief module are all controlled to be in a closed state.

10. The method for detecting the sealing performance of a control system of a gas engine according to claim 6, characterized in that: The control system of the gas engine further comprises a first valve; the first valve is located in the input branch and between the gas inlet and the interlock valve group; Before the pre-charge stage, the method further includes: The gas engine is controlled to be in a shutdown state and the first valve is controlled to be in a closed state.

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