Fuel gas supply system of engine, control method and device of fuel gas supply system and vehicle

Abstract

The invention discloses a fuel gas supply system of an engine, a control method and device of the fuel gas supply system and a vehicle. The fuel gas supply system comprises a fuel gas supply pipeline, a pressure relief pipeline, a first fuel gas cut-off valve, a diaphragm type pressure regulating valve, a fuel gas flow valve and a second fuel gas cut-off valve. The gas supply pipeline is arranged between the gas supply unit and a combustion chamber of the engine; the first fuel gas cut-off valve, the diaphragm type pressure regulating valve and the fuel gas flow valve are sequentially arranged in the fuel gas supply pipeline along a fuel gas circulation path; a pressure relief port is formed in the portion, between the diaphragm type pressure regulating valve and the gas flow valve, of the gas supply pipeline, the gas inlet end of the pressure relief pipeline communicates with the pressure relief port, the second gas stop valve is located in the pressure relief pipeline, and the situation that the diaphragm type pressure regulating valve cannot be opened due to the fact that the pressure at the downstream position of the diaphragm type pressure regulating valve is too large can be avoided. And normal operation of the engine can be guaranteed when the engine is started next time, and the service life of the diaphragm type pressure regulating valve can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of engine gas supply, and in particular to an engine gas supply system and a control method, device and vehicle thereof. Background Art

[0002] The diaphragm-type gas pressure regulating valve is a key component in the natural gas engine's gas system. Its internal pressure-regulating structure features multiple diaphragms, which achieve a dynamic balance between inlet and outlet pressures through the synergistic effect of spring preload and diaphragm displacement. When the engine is abruptly stopped, the gas shut-off valve upstream of the gas pressure regulating valve and the gas flow valve downstream of the valve rapidly close, causing a rapid increase in pressure downstream of the valve. This pressure can prevent the valve from opening properly, affecting the engine's operating state when it resumes operation and even causing damage to the diaphragm inside the valve, shortening its service life. Summary of the Invention

[0003] The present invention provides an engine gas supply system and a control method, device and vehicle thereof, so as to solve the problem that a gas pressure regulating valve cannot be opened normally or is even damaged after an engine emergency stop.

[0004] According to one aspect of the present invention, there is provided a gas supply system for an engine, comprising: a gas supply pipeline, a pressure relief pipeline, a first gas shut-off valve, a diaphragm pressure regulating valve, a gas flow valve, and a second gas shut-off valve;

[0005] The gas supply pipeline is provided between the gas supply unit and the combustion chamber of the engine;

[0006] The first gas shut-off valve, the diaphragm pressure regulating valve and the gas flow valve are sequentially arranged in the gas supply pipeline along the flow path of the gas;

[0007] The gas supply pipeline between the diaphragm pressure regulating valve and the gas flow valve is provided with a pressure relief port, the air inlet end of the pressure relief pipeline is communicated with the pressure relief port, and the second gas shut-off valve is located in the pressure relief pipeline.

[0008] Optionally, the first gas shut-off valve and the gas flow valve are configured to be closed when the engine is suddenly stopped, and the second gas shut-off valve is configured to be opened when the engine is suddenly stopped.

[0009] Optionally, the second gas shut-off valve is further configured to close after being opened for a preset time.

[0010] Optionally, the first gas shut-off valve and the gas flow valve are configured to be opened when the engine is running, and the second gas shut-off valve is configured to be closed when the engine is running.

[0011] According to another aspect of the present invention, a method for controlling a gas supply system of an engine is provided, for controlling the gas supply system of the engine, comprising:

[0012] Obtaining the operating status of the engine;

[0013] The first gas shut-off valve, the gas flow valve and the second gas shut-off valve are controlled to be opened or closed according to the operating state.

[0014] Optionally, controlling the first gas shut-off valve, the gas flow valve, and the second gas shut-off valve to open or close according to the operating state includes:

[0015] When the engine is determined to be suddenly stopped according to the operating state, the first gas shut-off valve and the gas flow valve are controlled to be closed, and the second gas shut-off valve is controlled to be opened.

[0016] Optionally, the control method of the engine gas supply system further includes:

[0017] After controlling the second gas shut-off valve to open, obtaining the duration of the second gas shut-off valve being open;

[0018] When the duration reaches a preset time, the second gas shut-off valve is controlled to close.

[0019] Optionally, controlling the first gas shut-off valve, the gas flow valve, and the second gas shut-off valve to open or close according to the operating state includes:

[0020] When it is determined according to the operating state that the engine is operating normally, the first gas shut-off valve and the gas flow valve are controlled to be opened, and the second gas shut-off valve is controlled to be closed.

[0021] According to another aspect of the present invention, a control device for a gas supply system of an engine is provided, characterized in that it is used to control the gas supply system of the engine, comprising:

[0022] An operating status acquisition module, configured to acquire the operating status of the engine;

[0023] A control module is used to control the first gas shut-off valve, the gas flow valve and the second gas shut-off valve to open or close according to the operating state.

[0024] According to another aspect of the present invention, there is provided a vehicle comprising: a controller and the above-mentioned gas supply system of the engine;

[0025] The controller is used to execute the above-mentioned control method of the gas supply system of the engine.

[0026] The gas supply system of the engine provided by the embodiment of the present invention sets a gas supply pipeline between the gas supply unit and the combustion chamber of the engine, so that the gas supply unit can supply gas to the combustion chamber of the engine through the gas supply pipeline, and sets a first gas shut-off valve, a diaphragm pressure regulating valve and a gas flow valve in the gas supply pipeline in sequence along the flow path of the gas, so that the gas supply pipeline can be turned on or off by controlling the on-off of the first gas shut-off valve, the gas flow supplied to the combustion chamber of the engine can be controlled by controlling the opening of the gas flow valve, and the gas pressure supplied to the combustion chamber of the engine can be adjusted by the diaphragm pressure regulating valve. On this basis, the gas supply between the diaphragm pressure regulating valve and the gas flow valve is After the diaphragm pressure regulating valve is started, the gas of described second shut-off valve is opened, and the diaphragm pressure regulating valve is opened, and the diaphragm pressure regulating valve is opened, and the diaphragm pressure regulating valve is opened.

[0027] 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

[0028] 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.

[0029] Figure 1 This is a schematic structural diagram of a gas supply system for an engine provided by an embodiment of the present invention;

[0030] Figure 2 This is a flow chart of a method for controlling a fuel gas supply system of an engine provided by an embodiment of the present invention;

[0031] Figure 3 This is a flow chart of another method for controlling a fuel gas supply system of an engine provided by an embodiment of the present invention;

[0032] Figure 4 It is a structural schematic diagram of a control device for a gas supply system of an engine provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] Figure 1 FIG. 1 is a structural diagram of a fuel gas supply system for an engine provided by an embodiment of the present invention. Figure 1 As shown, a gas supply pipeline 1, a pressure relief pipeline 2, a first gas shut-off valve 3, a diaphragm pressure regulating valve 4, a gas flow valve 5 and a second gas shut-off valve 6 are provided; the gas supply pipeline 1 is arranged between the gas supply unit 7 and the combustion chamber 8 of the engine; the first gas shut-off valve 3, the diaphragm pressure regulating valve 4 and the gas flow valve 5 are arranged in sequence in the gas supply pipeline 1 along the flow path of the gas; the gas supply pipeline 1 between the diaphragm pressure regulating valve 4 and the gas flow valve 5 is provided with a pressure relief port A, the air inlet end of the pressure relief pipeline 2 is connected to the pressure relief port A, and the second gas shut-off valve 6 is located in the pressure relief pipeline 2.

[0036] Specifically, when gas needs to be supplied to the engine's combustion chamber 8, the first gas shut-off valve 3 and the gas flow valve 5 provided in the gas supply pipeline 1 are both in the open state. Gas in the gas supply unit 7 then passes through the first gas shut-off valve 3 and enters the diaphragm pressure regulating valve 4. The gas pressure regulating valve 4 adjusts the gas pressure to the pressure required by the engine before transmitting the gas through the gas flow valve 5 to the engine's combustion chamber 8. The gas flow valve 5 is used to adjust the gas flow rate supplied to the engine's combustion chamber 8 to match the engine load. A pressure relief port A is provided on the gas supply pipeline 1 between the diaphragm pressure regulating valve 4 and the gas flow valve 5, and the air inlet end of the pressure relief pipeline 2 is connected to the pressure relief port A, that is, the pressure relief port A is provided at the downstream position of the diaphragm pressure regulating valve 4. By providing the air inlet end of the pressure relief pipeline 2 to be connected to the pressure relief port A, and providing the second gas shut-off valve 6 in the pressure relief pipeline 2, the connection state of the pressure relief pipeline 2 can be controlled by the second gas shut-off valve 6. In this way, when the pressure at the downstream position of the diaphragm pressure regulating valve 4 is too high, the second gas shut-off valve 6 can be controlled to open in time to discharge the gas remaining between the diaphragm pressure regulating valve 4 and the gas flow valve 5 through the pressure relief pipeline 2, thereby reducing the pressure at the downstream position of the diaphragm pressure regulating valve 4, thereby avoiding the problem that the diaphragm pressure regulating valve 4 cannot be opened or even the diaphragm is damaged due to excessive pressure at the downstream position of the diaphragm pressure regulating valve 4, ensuring the normal operation of the engine at the next start, and extending the service life of the diaphragm pressure regulating valve 4.

[0037] The gas supply system of the engine provided by the embodiment of the present invention sets a gas supply pipeline between the gas supply unit and the combustion chamber of the engine, so that the gas supply unit can supply gas to the combustion chamber of the engine through the gas supply pipeline, and sets a first gas shut-off valve, a diaphragm pressure regulating valve and a gas flow valve in the gas supply pipeline in sequence along the flow path of the gas, so that the gas supply pipeline can be turned on or off by controlling the on-off of the first gas shut-off valve, the gas flow supplied to the combustion chamber of the engine can be controlled by controlling the opening of the gas flow valve, and the gas pressure supplied to the combustion chamber of the engine can be adjusted by the diaphragm pressure regulating valve. On this basis, the gas supply between the diaphragm pressure regulating valve and the gas flow valve is After the diaphragm pressure regulating valve is started, the gas of described second shut-off valve is opened, and the diaphragm pressure regulating valve is opened, and the diaphragm pressure regulating valve is opened, and the diaphragm pressure regulating valve is opened.

[0038] Optional, reference Figure 1 , the first gas shut-off valve 3 and the gas flow valve 5 are configured to be closed when the engine is suddenly stopped, and the second gas shut-off valve 6 is configured to be opened when the engine is suddenly stopped.

[0039] Specifically, when the engine stops suddenly, the first gas shut-off valve 3 and the gas flow valve 5 are controlled to close in time, and the supply of gas to the combustion chamber 8 of the engine is stopped in time to ensure that the engine stops running. At this time, there will be residual gas between the first gas shut-off valve 3 and the gas flow valve 5, especially there will be more residual gas between the diaphragm pressure regulating valve 4 and the gas flow valve 5, resulting in a large pressure at the downstream position of the diaphragm pressure regulating valve 4, which may easily cause damage to the diaphragm inside the diaphragm pressure regulating valve 4, or cause the diaphragm pressure regulating valve 4 to fail to open normally. At this time, the second gas shut-off valve 6 can be opened when the engine stops suddenly, so that the pressure at the downstream position of the diaphragm pressure regulating valve 4 can be released in time, which can avoid the diaphragm pressure regulating valve 4 from being damaged due to excessive pressure at the downstream position, and avoid the diaphragm pressure regulating valve 4 from being unable to open due to excessive pressure at the downstream position.

[0040] Optional, continue to refer to Figure 1 The second gas shut-off valve 6 is further configured to close after being opened for a preset time.

[0041] Specifically, if the first gas shut-off valve 3 is damaged and cannot be closed due to the damage, the second gas shut-off valve 6 remains open, resulting in a large amount of gas leakage. Therefore, setting the second gas shut-off valve 6 to close after a preset opening time can ensure that gas leakage is avoided on the basis of releasing the pressure downstream of the diaphragm pressure regulating valve 4.

[0042] Optional, continue to refer to Figure 1 , the first gas shut-off valve 3 and the gas flow valve 5 are configured to be opened when the engine is running, and the second gas shut-off valve 6 is configured to be closed when the engine is running.

[0043] Specifically, the first gas shut-off valve 3 and the gas flow valve 5 are set to open when the engine is running, so that gas is normally supplied to the combustion chamber 8 of the engine when the engine is running, ensuring the normal operation of the engine. At the same time, the second gas shut-off valve 6 is set to be closed when the engine is running, which can avoid unnecessary leakage of gas and avoid gas waste.

[0044] It can be understood that a shut-off valve, a diaphragm assembly, a diaphragm cavity, a pressure-regulating spring, a pressure reducer and other components can be provided inside the gas flow valve 5. The valve stem of the pressure reducer seat is connected to the diaphragm assembly in the diaphragm cavity. After the gas enters the pressure reducer, the valve seat gasket of the pressure reducer seat is under the pressure difference between the gas inlet and the outlet, overcoming the pressure of the pressure-regulating spring and opening the pressure reducer seat to connect the gas inlet and the outlet. There is an internal channel between the gas outlet and the diaphragm cavity, which plays the role of a partial balance pipe. According to the change of the outlet pressure, it acts on the diaphragm assembly, dynamically adjusts the opening of the module assembly and the valve seat, and realizes flow regulation.

[0045] Based on the same inventive concept, an embodiment of the present invention also provides a method for controlling the gas supply system of an engine. The method for controlling the gas supply system of an engine is used to control the gas supply system of an engine provided by any embodiment of the present invention. The method for controlling the gas supply system of an engine can be executed by a control device of the gas supply system of an engine provided by any embodiment of the present invention. The control device of the gas supply system of the engine can be implemented by software and / or hardware, and the control device of the gas supply system of the engine can be integrated into a controller.

[0046] Figure 2 FIG. 1 is a flow chart of a method for controlling a fuel gas supply system of an engine provided by an embodiment of the present invention. Figure 2 As shown, the control method of the gas supply system of the engine includes:

[0047] S110: Obtain the operating status of the engine.

[0048] S120: Control the first gas shut-off valve, the gas flow valve, and the second gas shut-off valve to open or close according to the operating status.

[0049] Specifically, the operating state of the engine may include emergency stop and normal operation, and the operating state of the engine may be determined by the state signal of the engine controller. Figure 1 In different operating states, the first gas shut-off valve 3, the gas flow valve 5 and the second gas shut-off valve 6 need to cooperate with different states to normally supply gas to the engine's combustion chamber 8 when the engine is operating normally, and stop supplying gas to the engine's combustion chamber 8 when the engine stops suddenly, and ensure that the pressure downstream of the diaphragm flow valve 5 is not too large, to avoid the diaphragm flow valve 5 from failing to open normally or damage to the internal diaphragm.

[0050] The control method of the engine gas supply system provided in an embodiment of the present invention can control the first gas shut-off valve, the gas flow valve, and the second gas shut-off valve according to the operating status of the engine. When the engine stops suddenly, it can avoid the problem that the diaphragm pressure regulating valve cannot be opened or even the diaphragm is damaged due to excessive pressure at the downstream position of the diaphragm pressure regulating valve. It can ensure the normal operation of the engine when it is started next time and can extend the service life of the diaphragm pressure regulating valve.

[0051] Optional, Figure 3 FIG. 1 is a flow chart of another method for controlling a fuel gas supply system of an engine provided by an embodiment of the present invention. Figure 3 As shown, the control method of the gas supply system of the engine includes:

[0052] S210: Obtain the operating status of the engine.

[0053] S220: Determine whether the engine's operating state is emergency stop; if so, execute step S230; if not, execute step S260.

[0054] S230: Control the first gas shut-off valve and the gas flow valve to close, and control the second gas shut-off valve to open.

[0055] Specifically, when the engine stops suddenly, the first gas shut-off valve 3 and the gas flow valve 5 are controlled to close in time, and the supply of gas to the combustion chamber 8 of the engine is stopped in time to ensure that the engine stops running. At this time, there will be residual gas between the first gas shut-off valve 3 and the gas flow valve 5, especially there will be more residual gas between the diaphragm pressure regulating valve 4 and the gas flow valve 5, resulting in a large pressure at the downstream position of the diaphragm pressure regulating valve 4, which may easily cause damage to the diaphragm inside the diaphragm pressure regulating valve 4, or cause the diaphragm pressure regulating valve 4 to fail to open normally. At this time, the second gas shut-off valve 6 can be controlled to open when the engine stops suddenly, so that the pressure at the downstream position of the diaphragm pressure regulating valve 4 can be released in time, which can avoid the diaphragm pressure regulating valve 4 from being damaged due to excessive pressure at the downstream position, and avoid the diaphragm pressure regulating valve 4 from being unable to open due to excessive pressure at the downstream position.

[0056] S240: After controlling the second gas shut-off valve to open, obtain the duration of the second gas shut-off valve being open.

[0057] S250: When the duration reaches a preset time, control the second gas shut-off valve to close.

[0058] Specifically, if the first gas shut-off valve 3 is damaged and cannot be closed due to the damage, the second gas shut-off valve 6 remains open, resulting in a large amount of gas leakage. Therefore, setting the second gas shut-off valve 6 to close after a preset opening time can ensure that gas leakage is avoided on the basis of releasing the pressure downstream of the diaphragm pressure regulating valve 4.

[0059] S260: Determine that the engine is operating normally.

[0060] S270: Control the first gas shut-off valve and the gas flow valve to open, and control the second gas shut-off valve to close.

[0061] Specifically, the first gas shut-off valve 3 and the gas flow valve 5 are set to open when the engine is running, so that gas is normally supplied to the combustion chamber 8 of the engine when the engine is running, ensuring the normal operation of the engine. At the same time, the second gas shut-off valve 6 is set to be closed when the engine is running, which can avoid unnecessary leakage of gas and avoid gas waste.

[0062] Based on the same inventive concept, an embodiment of the present invention also provides a control device for an engine's gas supply system, which is used to execute the control method for an engine's gas supply system provided by any embodiment of the present invention. The control device for the engine's gas supply system can be implemented by software and / or hardware, and the control device for the engine's gas supply system can be integrated into a controller.

[0063] Figure 4FIG. 1 is a schematic diagram of a control device for a gas supply system of an engine provided by an embodiment of the present invention. Figure 4 As shown, the control device of the engine's gas supply system includes: an operating status acquisition module 100 for acquiring the engine's operating status; a control module 200 for controlling the first gas shut-off valve, the gas flow valve and the second gas shut-off valve to open or close according to the operating status.

[0064] The control device of the engine gas supply system provided in an embodiment of the present invention can control the first gas shut-off valve, the gas flow valve and the second gas shut-off valve according to the operating status of the engine. When the engine stops suddenly, it can avoid the problem that the diaphragm pressure regulating valve cannot be opened or even the diaphragm is damaged due to excessive pressure at the downstream position of the diaphragm pressure regulating valve. It can ensure the normal operation of the engine when it is started next time and can extend the service life of the diaphragm pressure regulating valve.

[0065] Optionally, the control module includes a first control unit for controlling the first gas shut-off valve and the gas flow valve to close, and controlling the second gas shut-off valve to open, when the engine is determined to be shut down suddenly according to the operating status.

[0066] Optionally, the control module further includes a duration acquisition unit for acquiring the duration of the second gas shut-off valve being opened after controlling the second gas shut-off valve to be opened; and a second control unit for controlling the second gas shut-off valve to be closed when the duration reaches a preset time.

[0067] Optionally, the control module further includes a third control unit, configured to control the second gas shut-off valve to close when the duration reaches a preset time.

[0068] Based on the same inventive concept, an embodiment of the present invention further provides a vehicle, comprising a controller and a gas supply system for an engine provided by any embodiment of the present invention, wherein the controller is used to execute the control method for the gas supply system for an engine provided by any embodiment of the present invention. Therefore, the vehicle provided by an embodiment of the present invention includes the technical features of the gas supply system for an engine and the control method for the gas supply system provided by any embodiment of the present invention, and can achieve the beneficial effects of the gas supply system for an engine and the control method for the gas supply system provided by any embodiment of the present invention. The similarities can be referred to the above description of the gas supply system for an engine and the control method for the gas supply system provided by the embodiment of the present invention, and will not be repeated here.

[0069] 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.

[0070] 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 supply system for an engine, characterized in that: include: Gas supply pipeline, pressure relief pipeline, first gas shut-off valve, diaphragm pressure regulating valve, gas flow valve and second gas shut-off valve; The gas supply pipeline is provided between the gas supply unit and the combustion chamber of the engine; The first gas shut-off valve, the diaphragm pressure regulating valve and the gas flow valve are sequentially arranged in the gas supply pipeline along the flow path of the gas; The gas supply pipeline between the diaphragm pressure regulating valve and the gas flow valve is provided with a pressure relief port, the air inlet end of the pressure relief pipeline is communicated with the pressure relief port, and the second gas shut-off valve is located in the pressure relief pipeline.

2. The engine gas supply system according to claim 1, characterized in that: The first gas shutoff valve and the gas flow valve are configured to be closed when the engine is suddenly stopped, and the second gas shutoff valve is configured to be opened when the engine is suddenly stopped.

3. The engine gas supply system according to claim 2, characterized in that: The second gas shut-off valve is further configured to close after being opened for a preset time.

4. The engine gas supply system according to claim 1, characterized in that: The first gas shutoff valve and the gas flow valve are configured to be opened when the engine is running, and the second gas shutoff valve is configured to be closed when the engine is running.

5. A method for controlling a gas supply system of an engine, for controlling the gas supply system of an engine according to any one of claims 1 to 4, characterized in that: include: Obtaining the operating status of the engine; The first gas shut-off valve, the gas flow valve and the second gas shut-off valve are controlled to be opened or closed according to the operating state.

6. The method for controlling the gas supply system of an engine according to claim 5, characterized in that: Controlling the first gas shut-off valve, the gas flow valve, and the second gas shut-off valve to be opened or closed according to the operating state includes: When the engine is determined to be suddenly stopped according to the operating state, the first gas shut-off valve and the gas flow valve are controlled to be closed, and the second gas shut-off valve is controlled to be opened.

7. The method for controlling the gas supply system of an engine according to claim 6, characterized in that: Also includes: After controlling the second gas shut-off valve to open, obtaining the duration of the second gas shut-off valve being open; When the duration reaches a preset time, the second gas shut-off valve is controlled to close.

8. The method for controlling the gas supply system of an engine according to claim 5, characterized in that: Controlling the first gas shut-off valve, the gas flow valve, and the second gas shut-off valve to be opened or closed according to the operating state includes: When it is determined according to the operating state that the engine is operating normally, the first gas shut-off valve and the gas flow valve are controlled to be opened, and the second gas shut-off valve is controlled to be closed.

9. A control device for a gas supply system of an engine, characterized in that: A gas supply system for controlling an engine according to any one of claims 1 to 4, characterized in that it comprises: An operating status acquisition module, configured to acquire the operating status of the engine; A control module is used to control the first gas shut-off valve, the gas flow valve and the second gas shut-off valve to open or close according to the operating state.

10. A vehicle, characterized in that: include: A controller and a gas supply system for an engine according to any one of claims 1 to 4; The controller is used to execute the control method of the engine gas supply system according to any one of claims 5 to 8.

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