Hydrogen engine cross-flow ventilation system and control method

Abstract

The application discloses a hydrogen engine through ventilation system and control method. The system comprises: a cylinder head body, a combustion chamber, a cylinder body, an oil pan, an oil-gas separator, a controllable gas circulation assembly, a supercharger, a first and second control valve assembly and an air filter; the combustion chamber is connected with the cylinder body; the oil return channel of the cylinder body is communicated with the oil return channel of the cylinder head body, and the oil return channel of the cylinder head body is communicated with the inlet of the oil-gas separator; the first outlet of the oil-gas separator is communicated with the oil pan; the second outlet of the oil-gas separator is connected with the inlet of the controllable gas circulation assembly; the outlet of the controllable gas circulation assembly is communicated with the air inlet channel of the cylinder head body through the first control valve assembly or through the supercharger and the second control valve assembly; the air inlet channel of the cylinder head body is communicated with the inlet of the combustion chamber; and the outlet of the air filter is communicated with the cylinder body. The scheme reduces the risk of oil emulsification in the cylinder body caused by water aggregation.

Description

Technical Field

[0001] This invention relates to the field of hydrogen engine technology, and more particularly to a hydrogen engine ventilation system and control method. Background Technology

[0002] When a hydrogen internal combustion engine is operating, the high-pressure combustible mixture in the combustion chamber leaks into the cylinder block through the gap between the piston assembly and the cylinder, causing blow-by. Blow-by consists of water vapor and gases (including unburned hydrogen and exhaust gases). Excessive water emulsifies the lubricating oil in the cylinder block, reducing its performance and accelerating oxidation and deterioration. Compared to traditional internal combustion engines, hydrogen internal combustion engines have a higher water content in their combustion products. The accumulation of large amounts of water in the blow-by system poses a significant risk of oil emulsification. Furthermore, oil emulsions easily clog the oil-gas separator in the blow-by system, reducing its separation rate or even blocking the entire system, leading to severe oil dipstick spraying problems. Alternatively, blow-by can cause excessive cylinder pressure, damaging the cylinder seals and posing an explosion risk. Therefore, hydrogen engines urgently need a more intelligent oil-water separation strategy and a higher gas circulation speed in their blow-by systems. Summary of the Invention

[0003] This invention provides a ventilation system and control method for a hydrogen engine, which improves the gas circulation speed in the ventilation system, thereby reducing the risk of oil emulsification caused by water accumulation in the ventilation system, and also avoids excessive pressure in the cylinder.

[0004] To achieve the above objectives, in a first aspect, embodiments of the present invention provide a hydrogen engine ventilation system, which includes: a cylinder head body, a combustion chamber, a cylinder block, an oil pan, an oil-gas separator, a controllable gas circulation assembly, a turbocharger, a first control valve assembly, a second control valve assembly, and an air filter;

[0005] The combustion chamber is in contact with the cylinder block; the oil return passage of the cylinder block is connected to the oil return passage of the cylinder head body, and the oil return passage of the cylinder head body is connected to the inlet of the oil-gas separator; the first outlet of the oil-gas separator is connected to the oil pan.

[0006] The second outlet of the oil-gas separator is connected to the inlet of the controllable gas circulation assembly; the outlet of the controllable gas circulation assembly is connected to the intake passage of the cylinder head body through the first control valve assembly; the intake passage of the cylinder head body is connected to the inlet of the combustion chamber.

[0007] The outlet of the controllable gas circulation assembly is also connected to the intake manifold of the cylinder head body through the turbocharger and the second control valve assembly;

[0008] The outlet of the air filter is connected to the cylinder body;

[0009] The gas circulation speed of the controllable gas circulation component is determined by the operating parameters of the hydrogen engine.

[0010] Optionally, the controllable gas circulation component is an electrically controlled vacuum pump; wherein the rotational speed of the electrically controlled vacuum pump is determined by the operating parameters of the hydrogen engine.

[0011] Optionally, the controllable gas circulation component is a Venturi assembly.

[0012] Optionally, the Venturi assembly includes a Venturi tube, an air pump, a high-pressure air tank, and a pressure regulating valve;

[0013] The outlet of the air filter is also connected to the high-pressure inlet of the venturi tube via the air compressor, the high-pressure air tank, and the pressure regulating valve; the second outlet of the oil-gas separator is connected to the inlet of the venturi tube; the outlet of the venturi tube is connected to the intake manifold of the cylinder head body via the turbocharger and the second control valve assembly; the outlet of the venturi tube is also connected to the intake manifold of the cylinder head body via the first control valve assembly.

[0014] Optionally, the system may also include: a first check valve and a second check valve;

[0015] The second outlet of the oil-gas separator is connected to the inlet of the controllable gas circulation assembly through the first one-way valve;

[0016] The outlet of the air filter is connected to the cylinder body through the second one-way valve.

[0017] Optionally, the first control valve assembly includes a PCV valve; the second control valve assembly includes an intercooler and a throttle valve.

[0018] Optionally, the system may also include: a valve cover oil-gas separator;

[0019] The oil return passage of the cylinder head body is connected to the inlet of the valve cover oil-gas separator; the first outlet of the valve cover oil-gas separator is connected to the oil return passage of the cylinder head body.

[0020] The second outlet of the valve chamber cover oil-gas separator is connected to the inlet of the oil-gas separator; the first outlet of the oil-gas separator is connected to the oil pan.

[0021] The second outlet of the oil-gas separator is connected to the inlet of the controllable gas circulation assembly.

[0022] Optionally, the operating parameters of the hydrogen engine include hydrogen engine speed, hydrogen engine load, lubricating oil temperature in the cylinder, hydrogen engine intake and exhaust temperatures, hydrogen engine coolant temperature, hydrogen engine intake and exhaust pressures, cylinder pressure, combustion model in the combustion chamber, and ambient temperature parameters.

[0023] Secondly, embodiments of the present invention also provide a method for controlling the ducted ventilation of a hydrogen engine, which is applied to the ducted ventilation system of the hydrogen engine described in the first aspect above; the method for controlling the ducted ventilation of the hydrogen engine includes:

[0024] Obtain the current operating parameters of the hydrogen engine;

[0025] The gas circulation speed of the controllable gas circulation assembly is determined according to the operating parameters of the hydrogen engine so that the gas output from the second outlet of the oil-gas separator is discharged into the intake manifold of the cylinder head body through the controllable gas circulation assembly and the first control valve assembly; or discharged into the intake manifold of the cylinder head body through the controllable gas circulation assembly and the turbocharger.

[0026] Optionally, determining the gas circulation speed of the controllable gas circulation component based on the operating parameters of the hydrogen engine includes:

[0027] Based on the operating parameters of the hydrogen engine, the gas circulation speed of the controllable gas circulation assembly is determined to be a first speed so that the gas output from the second outlet of the oil-gas separator is discharged into the intake manifold of the cylinder head body through the controllable gas circulation assembly and the first control valve assembly.

[0028] Based on the operating parameters of the engine body, the gas circulation speed of the controllable gas circulation assembly is determined to be the second speed so that the gas output from the second outlet of the oil-gas separator is discharged into the intake manifold of the cylinder head body through the controllable gas circulation assembly and the turbocharger.

[0029] Wherein, the first speed is greater than the second speed.

[0030] Because the blow-by volume of a hydrogen engine varies under different operating conditions, it is impossible to ensure that the oil-gas separator operates within its efficient separation range under all these conditions. This invention addresses this issue by controlling the gas circulation speed of the controllable gas circulation component based on the difference between the blow-by volume under different operating conditions and the intake air volume required for efficient oil-gas separation. This establishes different negative pressure environments within the cylinder, allowing a certain amount of fresh air to be supplied to the cylinder through the air filter to compensate for the difference in blow-by volume. This achieves efficient oil-gas separation under different engine operating conditions, significantly reducing the risk of oil emulsification. Furthermore, when the blow-by gas encounters the fresh air supplied to the cylinder, some of the water and oil in the blow-by gas condenses in the oil pan, reducing the water and oil content in the gas entering the ventilation system and lowering the risk of oil emulsification due to condensate accumulation. Moreover, the efficient separation by the oil-gas separator under different engine operating conditions promotes rapid gas flow, preventing excessive cylinder pressure that could damage the cylinder seals. It also promotes rapid circulation of hydrogen in the blow-by gas for combustion, avoiding the risk of detonation caused by hydrogen accumulation in the gas. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a hydrogen engine ventilation system provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of another hydrogen engine ventilation system provided in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of another hydrogen engine ventilation system provided in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of another hydrogen engine ventilation system provided in an embodiment of the present invention;

[0035] Figure 5 This is a flowchart of a ventilation control method for a hydrogen engine provided in an embodiment of the present invention. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0037] Figure 1 This is a schematic diagram of the structure of a hydrogen engine ventilation system provided in an embodiment of the present invention; as shown below. Figure 1As shown, the system includes: cylinder head body 1, combustion chamber 2, cylinder block 3, oil pan 4, oil-gas separator 5, controllable gas circulation assembly 6, turbocharger 7, first control valve assembly 8, second control valve assembly 9, and air filter 10; combustion chamber 2 is in contact with cylinder block 3; oil return passage of cylinder block 3 is connected to oil return passage of cylinder head body 1, and oil return passage of cylinder head body 1 is connected to inlet of oil-gas separator 5; first outlet of oil-gas separator 5 is connected to oil pan 4;

[0038] The second outlet of the oil-gas separator 5 is connected to the inlet of the controllable gas circulation assembly 6; the outlet of the controllable gas circulation assembly 6 is connected to the intake passage of the cylinder head body 1 through the first control valve assembly 8; the exhaust passage of the cylinder head body 1 is connected to the inlet of the combustion chamber 2; the outlet of the controllable gas circulation assembly 6 is also connected to the intake passage of the cylinder head body 1 through the turbocharger 7 and the second control valve assembly 9.

[0039] The outlet of the air filter 10 is connected to the cylinder 3;

[0040] The gas circulation speed of the controllable gas circulation component 6 is determined by the operating parameters of the hydrogen engine.

[0041] In this embodiment, the ventilation process of the hydrogen engine's through-ventilation system is as follows: The high-pressure combustible mixture in the combustion chamber 2 will sneak into the space between the cylinder block 3 and the oil pan 4 through the gap between the piston assembly and the cylinder in the combustion chamber 2. The sneak gas (including water vapor, unreacted hydrogen, and exhaust gas) enters the oil-gas separator 5 through the oil return passage of the cylinder block 3 and the oil return passage of the cylinder head body 1. The oil-gas separator 5 separates the oil and gas, and the separated oil flows back into the oil pan 4. The separated gas enters the intake passage of the cylinder head body 1 through the controllable gas circulation assembly 6 and the first control valve assembly 8. The intake passage of the cylinder head body 1 is connected to the inlet of the combustion chamber 2, and the separated gas then circulates back into the combustion chamber 2. The gas, after combustion or separation, enters the intake manifold of the cylinder head body 1 through the controllable gas circulation assembly 6, the turbocharger 7, and the second control valve assembly 9. The intake manifold of the cylinder head body 1 is connected to the combustion chamber 2, thus entering the combustion chamber 2 to participate in combustion. As the controllable gas circulation assembly 6 continuously circulates the gas, the cylinder block 3 establishes a certain negative pressure environment. In this embodiment, a certain amount of fresh air is supplied to the cylinder block 3 through the air filter 10. When the blow-by gas encounters the fresh air supplied to the cylinder block 3, some of the water vapor and engine oil in the blow-by gas will condense in the oil pan 4, reducing the water and engine oil content in the gas entering the ventilation system and also reducing the risk of engine oil emulsification caused by the accumulation of condensate.

[0042] Furthermore, since the blow-by volume of the hydrogen engine varies under different operating conditions, the blow-by volume cannot keep the oil-gas separator 5 in the high-efficiency separation range under different engine operating conditions. In this embodiment of the invention, the gas circulation speed of the controllable gas circulation component 6 is controlled according to the difference between the blow-by volume under different operating conditions and the intake volume required for the oil-gas separator 5 to achieve high-efficiency separation. That is, the gas circulation speed of the controllable gas circulation component 6 is determined by the operating parameters of the hydrogen engine, thereby enabling the cylinder block 3 to establish different negative pressure environments. Then, different amounts of fresh air are supplied to the cylinder block 3 through the air filter 10 to compensate for the difference in blow-by volume. In this way, the high-efficiency separation of the oil-gas separator is achieved under different engine operating conditions. The high-efficiency separation of oil and gas reduces the water and oil content in the gas and also greatly reduces the risk of oil emulsification. It should be noted that the operating parameters of the hydrogen engine may include the hydrogen engine speed, hydrogen engine load, lubricating oil temperature in the cylinder block, hydrogen engine intake and exhaust temperatures, hydrogen engine coolant temperature, hydrogen engine intake and exhaust pressures, cylinder block pressure, combustion model in the combustion chamber, and ambient temperature parameters.

[0043] Specifically, it should be noted that when the hydrogen engine is under low load, the blow-by volume is small. The difference between this blow-by volume and the intake volume required for the oil-gas separator 5 to achieve high-efficiency separation is large. Therefore, the controllable gas circulation component 6 is accelerated to create a larger negative pressure environment in the cylinder block 3. The air filter 10 can then supply more fresh air to the cylinder block 3. At the same time, since the turbocharger 7 does not work under low load, the exhaust gas separated by the oil-gas separator 5 can enter the intake passage of the cylinder head body 1 through the controllable gas circulation component 6 and the first control valve component 8. The intake passage of the cylinder head body 1 is connected to the combustion chamber 2, and the separated gas then circulates into the combustion chamber 2 to participate in combustion.

[0044] When the hydrogen engine load increases, the blow-by volume is large. The difference between this blow-by volume and the intake volume required for efficient oil-gas separation is small, so the controllable gas circulation speed of the controllable gas circulation component is slowed down. A small negative pressure environment is established in the cylinder block 3, and the air filter 10 can supplement less fresh air into the cylinder block 3. At this time, the turbocharger 7 is working, and the exhaust gas separated by the oil-gas separator 5 can enter the intake port of the cylinder head body 1 through the controllable gas circulation component 6, the turbocharger 7 and the second control valve component 9. The intake port of the cylinder head body 1 is connected to the inlet of the combustion chamber 2, and the separated gas is circulated into the combustion chamber 2 to participate in combustion.

[0045] Simultaneously, the gas circulation speed of the controllable gas circulation component 6 is controlled according to the difference between the blow-by volume under different operating conditions and the intake volume required for the oil-gas separator 5 to achieve efficient separation. This allows the cylinder block to establish a certain negative pressure environment, and then the air filter 10 supplements the cylinder block 3 with different amounts of fresh air to make up for the difference in blow-by volume. This achieves efficient separation of the oil-gas separator under different engine operating conditions. The efficient separation of the oil-gas separator also promotes the rapid flow of gas under different engine operating conditions, which can prevent the cylinder block 3 from being damaged by excessive pressure. It also promotes the rapid circulation of hydrogen in the blow-by gas to participate in combustion, avoiding the risk of detonation caused by the accumulation of hydrogen in the gas.

[0046] Optionally, based on the above embodiments, the controllable gas circulation component 6 can be further refined. Figure 2 This is a schematic diagram of another hydrogen engine ventilation system provided in an embodiment of the present invention; as shown. Figure 2 As shown, the controllable gas circulation component 6 is an electrically controlled vacuum pump 61.

[0047] The rotational speed of the electronically controlled vacuum pump 61 can be determined by the operating parameters of the hydrogen engine. Specifically, when the hydrogen engine is under low load, the blow-by volume is small, and the difference between this blow-by volume and the intake volume required for efficient separation by the oil-gas separator 5 is large, so the rotational speed of the electronically controlled vacuum pump is increased. Conversely, when the hydrogen engine is under high load, the blow-by volume is large, and the difference between this blow-by volume and the intake volume required for efficient separation by the oil-gas separator 5 is small, so the rotational speed of the electronically controlled vacuum pump is decreased. This allows the maximum separation rate of the oil-gas separator to be met under different operating conditions, thereby reducing the risk of oil emulsification and solving the problem of excessive cylinder pressure. The rotational speed of the electronically controlled vacuum pump can be driven by the electrical signal output from the motor. Using the electronically controlled vacuum pump 61 in the controllable gas circulation assembly 6 can improve the accuracy of controlling the gas circulation speed.

[0048] Optional, Figure 3 This is a schematic diagram of another hydrogen engine ventilation system provided in an embodiment of the present invention; as shown. Figure 3 As shown, the controllable gas circulation assembly 6 is a Venturi assembly 62. The Venturi assembly 62 includes a Venturi tube 621, an air compressor 622, a high-pressure gas tank 623, and a pressure regulating valve 624. The outlet of the air filter 10 is also connected to the high-pressure inlet of the Venturi tube 621 via the air compressor 622, the high-pressure gas tank 623, and the pressure regulating valve 624. The second outlet of the oil-gas separator 5 is connected to the inlet of the Venturi tube 621. The outlet of the Venturi tube 621 is connected to the intake passage of the cylinder head body 1 via the booster 7 and the second control valve assembly 9; alternatively, the outlet of the Venturi tube 621 is connected to the intake passage of the cylinder head body 1 via the first control valve assembly 8.

[0049] The gas circulation speed of the Venturi assembly 62 is determined by the operating parameters of the hydrogen engine; the gas circulation speed of the Venturi assembly 62 can be changed by altering the pressure at its high-pressure input port. Specifically, during the operation of the Venturi assembly 62, the air output from the air filter 10 passes through the air compressor 622, the high-pressure air tank 623, and the pressure regulating valve 624 to output high-pressure air to the Venturi tube 621. Under the action of the high-pressure air, the Venturi tube 621 establishes a certain degree of vacuum, thus replacing the function of a vacuum pump.

[0050] Optionally, based on the above embodiments, the curved ventilation system can be further optimized. Figure 4 This is a schematic diagram of another hydrogen engine ventilation system provided in an embodiment of the present invention; the system further includes: a first one-way valve 11 and a second one-way valve 12; the second outlet of the oil-gas separator 5 is connected to the controllable gas circulation assembly 6 through the first one-way valve 11. Figure 4 (Example of an electric vacuum pump) The inlet connection is made to the air filter 10; the outlet of the air filter 10 is connected to the cylinder 3 via the second check valve 12.

[0051] The addition of a first check valve 11 can control the gas separated by the oil-gas separator 5 to be discharged to the controllable gas circulation assembly 6. Figure 4 (Example: an electric vacuum pump) The addition of a second check valve 12 allows control over the supply of air from the air filter 10 to the crankcase 3. Optionally, the first control valve assembly 11 includes a PCV valve; the second control valve assembly 12 includes an intercooler and a throttle body.

[0052] Optional, such as Figure 4 As shown, the system also includes: a valve cover oil-gas separator 13; the oil return passage of the cylinder head body 1 is connected to the inlet and the first outlet of the valve cover oil-gas separator 13; the second outlet of the valve cover oil-gas separator 13 is connected to the inlet of the oil-gas separator 5; the first outlet of the oil-gas separator 5 is connected to the oil pan 4; and the second outlet of the oil-gas separator 5 is connected to the inlet of the controllable gas circulation assembly 6.

[0053] Among them, blow-by gas (including water vapor, unreacted hydrogen and exhaust gas) passes through the oil return passage of cylinder block 3 and cylinder head body 1, and after initial separation by valve cover oil-gas separator 13, it passes through oil-gas separator 5 for further oil-gas separation. In this way, adding valve cover oil-gas separator 13 can further ensure the oil-gas separation rate, thereby further reducing the risk of oil emulsification and solving the problem of excessive crankcase pressure.

[0054] Based on the same inventive concept, this invention also provides a method for controlling the duct ventilation of a hydrogen engine, which is applied to the duct ventilation system of the hydrogen engine described above. Figure 5 This is a flowchart of a hydrogen engine duct ventilation control method provided in an embodiment of the present invention; as shown below. Figure 5 As shown, the ventilation control method for this hydrogen engine includes:

[0055] S110, Obtain the current operating parameters of the hydrogen engine;

[0056] S120. Determine the gas circulation speed of the controllable gas circulation assembly based on the operating parameters of the hydrogen engine so that the gas output from the second outlet of the oil-gas separator is discharged into the intake port of the cylinder head body through the controllable gas circulation assembly and the first control valve assembly; or discharged into the intake port of the cylinder head body through the controllable gas circulation assembly and the turbocharger.

[0057] Specifically, based on the operating parameters of the hydrogen engine, the gas circulation speed of the controllable gas circulation assembly is determined to be the first speed so that the gas output from the second outlet of the oil-gas separator is discharged into the intake port of the cylinder head body through the controllable gas circulation assembly and the first control valve assembly.

[0058] Based on the operating parameters of the engine body, the gas circulation speed of the controllable gas circulation assembly is determined to be the second speed so that the gas output from the second outlet of the oil-gas separator is discharged into the intake manifold of the cylinder head body through the controllable gas circulation assembly and the turbocharger; wherein, the first speed is greater than the second speed.

[0059] Understandably, when the hydrogen engine is under low load, the blow-by volume is small. The difference between this blow-by volume and the intake volume required for efficient separation by the oil-gas separator is large. Therefore, the gas circulation speed of the controllable gas circulation component is accelerated. Since the turbocharger 7 does not work under low load, the exhaust gas separated by the oil-gas separator 5 can enter the intake port of the cylinder head body 1 through the controllable gas circulation component 6 and the first control valve component 8. The intake port of the cylinder head body 1 is connected to the combustion chamber 2, and the separated exhaust gas is circulated into the combustion chamber 2 to participate in combustion.

[0060] When the hydrogen engine is under high load, the blow-by volume is large. The difference between this blow-by volume and the intake volume required for efficient oil-gas separation is small. Therefore, the gas circulation speed of the controllable gas circulation assembly 6 is reduced. At this time, the turbocharger 7 is working, and the exhaust gas separated by the oil-gas separator 5 can enter the intake port of the cylinder head body 1 through the controllable gas circulation assembly 6, the turbocharger 7, and the second control valve assembly 9. The intake port of the cylinder head body 1 is connected to the combustion chamber 2, and the separated gas is circulated into the combustion chamber 2 to participate in combustion. In this way, efficient separation of oil and gas by the oil-gas separator is achieved under different engine operating conditions. The efficient separation of oil and gas reduces the water and oil content in the exhaust gas and greatly reduces the risk of oil emulsification. At the same time, it can avoid excessive pressure in the crankcase and damage to the crankcase seal.

[0061] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A ventilation system for a hydrogen engine, characterized in that, include: Cylinder head body, combustion chamber, cylinder block, oil pan, oil-gas separator, controllable gas recirculation assembly, turbocharger, first control valve assembly, second control valve assembly, and air filter; The combustion chamber is in contact with the cylinder block; the oil return passage of the cylinder block is connected to the oil return passage of the cylinder head body, and the oil return passage of the cylinder head body is connected to the inlet of the oil-gas separator; the first outlet of the oil-gas separator is connected to the oil pan. The second outlet of the oil-gas separator is connected to the inlet of the controllable gas circulation assembly; the outlet of the controllable gas circulation assembly is connected to the intake passage of the cylinder head body through the first control valve assembly; the intake passage of the cylinder head body is connected to the inlet of the combustion chamber. The outlet of the controllable gas circulation assembly is also connected to the intake manifold of the cylinder head body through the turbocharger and the second control valve assembly; The outlet of the air filter is connected to the cylinder body; The gas circulation speed of the controllable gas circulation component is determined by the difference between the blow-by gas volume under the operating parameters of the hydrogen engine and the intake gas volume required for the oil-gas separator to achieve efficient separation.

2. The hydrogen engine ventilation system according to claim 1, characterized in that, The controllable gas circulation component is an electrically controlled vacuum pump; wherein, the rotational speed of the electrically controlled vacuum pump is determined by the operating parameters of the hydrogen engine.

3. The hydrogen engine ventilation system according to claim 1, characterized in that, The controllable gas circulation component is a Venturi assembly.

4. The hydrogen engine ventilation system according to claim 3, characterized in that, The Venturi assembly includes a Venturi tube, an air pump, a high-pressure air tank, and a pressure regulating valve; The outlet of the air filter is also connected to the high-pressure inlet of the venturi tube via the air compressor, the high-pressure air tank, and the pressure regulating valve; the second outlet of the oil-gas separator is connected to the inlet of the venturi tube; the outlet of the venturi tube is connected to the intake port of the cylinder head body via the turbocharger and the second control valve assembly; the outlet of the venturi tube is also connected to the intake port of the cylinder head body via the first control valve assembly.

5. The hydrogen engine ventilation system according to claim 1, characterized in that, Also includes: First check valve and second check valve; The second outlet of the oil-gas separator is connected to the inlet of the controllable gas circulation assembly through the first one-way valve; The outlet of the air filter is connected to the cylinder body through the second one-way valve.

6. The hydrogen engine ventilation system according to claim 5, characterized in that, The first control valve assembly includes a PCV valve; the second control valve assembly includes an intercooler and a throttle valve.

7. The hydrogen engine ventilation system according to claim 1, characterized in that, Also includes: Valve cover oil-gas separator; The oil return passage of the cylinder head body is connected to the inlet of the valve cover oil-gas separator; the first outlet of the valve cover oil-gas separator is connected to the oil return passage of the cylinder head body. The second outlet of the valve chamber cover oil-gas separator is connected to the inlet of the oil-gas separator; the first outlet of the oil-gas separator is connected to the oil pan. The second outlet of the oil-gas separator is connected to the inlet of the controllable gas circulation assembly.

8. The hydrogen engine ventilation system according to claim 1, characterized in that, The operating parameters of the hydrogen engine include hydrogen engine speed, hydrogen engine load, lubricating oil temperature in the cylinder, hydrogen engine intake and exhaust temperatures, hydrogen engine coolant temperature, hydrogen engine intake and exhaust pressures, cylinder pressure, combustion model in the combustion chamber, and ambient temperature parameters.

9. A method for controlling the ventilation of a hydrogen engine, characterized in that, The method is applied to the hydrogen engine duct ventilation system according to any one of claims 1-8; the hydrogen engine duct ventilation control method includes: Obtain the current operating parameters of the hydrogen engine; The gas circulation speed of the controllable gas circulation assembly is determined according to the operating parameters of the hydrogen engine so that the gas output from the second outlet of the oil-gas separator is discharged into the intake manifold of the cylinder head body through the controllable gas circulation assembly and the first control valve assembly; or discharged into the intake manifold of the cylinder head body through the controllable gas circulation assembly and the turbocharger.

10. The hydrogen engine ventilation control method according to claim 9, characterized in that, Determining the gas circulation speed of the controllable gas circulation assembly based on the operating parameters of the hydrogen engine includes: determining the gas circulation speed of the controllable gas circulation assembly as a first speed based on the operating parameters of the hydrogen engine so that the gas output from the second outlet of the oil-gas separator is discharged into the intake manifold of the cylinder head body through the controllable gas circulation assembly and the first control valve assembly. Based on the operating parameters of the engine body, the gas circulation speed of the controllable gas circulation assembly is determined to be the second speed so that the gas output from the second outlet of the oil-gas separator is discharged into the intake manifold of the cylinder head body through the controllable gas circulation assembly and the turbocharger. Wherein, the first speed is greater than the second speed.

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