Crankcase water removal system, hydrogen engine and water removal control method

Abstract

The invention discloses a crankcase water removal system, a hydrogen engine and a water removal control method. Belongs to the technical field of hydrogen engines, the crankcase water removal system is used for the hydrogen engine, the crankcase water removal system comprises a gas supplementing pipeline, a gas outlet pipeline and an oil-gas separator, at least part of the gas supplementing pipeline is arranged in the hydrogen engine, and one end of the gas supplementing pipeline is suitable for being communicated with the atmosphere; the oil-gas separator is arranged on the gas outlet pipeline, one end of the gas outlet pipeline is suitable for being communicated with the crankcase, the other end of the gas outlet pipeline is suitable for being communicated with a gas inlet system of the hydrogen engine, and the gas supplementing pipeline can supplement air into the crankcase so as to reduce the concentration of water vapor in the crankcase. And air can be heated by the hydrogen engine when entering the crankcase through the air supplementing pipeline, so that the risk that water vapor in the crankcase is condensed into liquid water is reduced, and the risk that oil in the crankcase is emulsified is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen engines, and in particular to a crankcase water removal system, a hydrogen engine and a water removal control method. Background Art

[0002] When a hydrogen engine is working, the combustion of hydrogen in the cylinder of the hydrogen engine will produce exhaust gas containing a large amount of water vapor. Since it is impossible to completely seal the piston and cylinder wall of a hydrogen engine, some exhaust gas can leak into the crankcase through the gap between the piston and the cylinder wall. If the temperature of the crankcase is low at this time, the water vapor may condense into liquid water after contacting the crankcase, which can easily cause the oil in the crankcase to emulsify. Summary of the invention

[0003] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the present invention provides a crankcase water removal system, which is conducive to reducing the risk of oil emulsification in the crankcase.

[0004] The present invention also provides a hydrogen engine having the crankcase water removal system.

[0005] The present invention also proposes a method for controlling water removal from the crankcase of the hydrogen engine.

[0006] A crankcase water removal system according to an embodiment of the present invention is used in a hydrogen engine, and the crankcase water removal system includes: an air supply pipeline, an air outlet pipeline and an oil-gas separator, at least a portion of the air supply pipeline is arranged inside the hydrogen engine, one end of the air supply pipeline is suitable for communicating with the atmosphere, and the other end of the air supply pipeline is suitable for communicating with the crankcase of the hydrogen engine; the oil-gas separator is arranged on the air outlet pipeline, one end of the air outlet pipeline is suitable for communicating with the crankcase, and the other end of the air outlet pipeline is suitable for communicating with the intake system of the hydrogen engine, and the oil-gas separator is used to filter the oil in the medium flowing through the air outlet pipeline.

[0007] According to the crankcase water removal system of an embodiment of the present invention, at least a portion of the air supply pipeline is arranged inside the hydrogen engine, and the air supply pipeline is connected to the crankcase of the hydrogen engine. The air supply pipeline can add air to the crankcase to reduce the concentration of water vapor in the crankcase, and the air can be heated by the hydrogen engine when entering the crankcase through the air supply pipeline, which is beneficial to reduce the risk of water vapor in the crankcase condensing into liquid water and reducing the risk of oil emulsification in the crankcase.

[0008] According to some embodiments of the present invention, the crankcase water removal system further includes: an air supply control valve, wherein the air supply control valve is disposed in the air supply pipeline, and the air supply control valve is used to control the air supply amount of the air supply pipeline.

[0009] According to some embodiments of the present invention, the air intake system comprises: an air filter, and the air supply line is suitable for communicating with the atmosphere through the air filter.

[0010] According to some embodiments of the present invention, the air intake system further includes: a supercharger and a throttle valve, the air filter is connected to the throttle valve through the supercharger; and the air outlet pipeline is suitable for connecting to the inlet of the supercharger and / or the outlet of the throttle valve.

[0011] According to some embodiments of the present invention, the outlet pipeline includes: a connecting branch and a plurality of outlet branches, at least a portion of each of the outlet branches is arranged inside the hydrogen engine; the oil-gas separator has a medium inlet, an oil outlet and a plurality of outlets, and the plurality of outlets correspond one-to-one to the plurality of outlet branches; wherein the connecting branch is suitable for connecting the crankcase and the medium inlet, the oil outlet is used to discharge the filtered oil into the crankcase, and each of the outlets is suitable for connecting with the inlet of the supercharger and / or the outlet of the throttle valve through the corresponding outlet branch.

[0012] According to some embodiments of the present invention, the multiple air outlet branches include: a first air outlet branch and a second air outlet branch, the cross-sectional area of ​​the first air outlet branch is larger than the cross-sectional area of ​​the second air outlet branch; the multiple air outlets include: a first air outlet and a second air outlet, the first air outlet is suitable for connecting with the inlet of the supercharger through the first air outlet branch, and the second air outlet is suitable for connecting with the outlet of the throttle valve through the second air outlet branch.

[0013] According to some embodiments of the present invention, at least a portion of the connecting branch is disposed inside the hydrogen engine.

[0014] A hydrogen engine according to another embodiment of the present invention includes the above-mentioned crankcase water removal system.

[0015] In the hydrogen engine according to the embodiment of the present invention, at least a portion of the air supply pipeline is arranged inside the hydrogen engine, and the air supply pipeline is connected to the crankcase of the hydrogen engine. The air supply pipeline can add air to the crankcase to reduce the concentration of water vapor in the crankcase, and the air can be heated by the hydrogen engine when entering the crankcase through the air supply pipeline, which is beneficial to reduce the risk of water vapor in the crankcase condensing into liquid water and reducing the risk of oil emulsification in the crankcase.

[0016] According to another aspect of an embodiment of the present invention, a method for controlling crankcase water removal of a hydrogen engine is provided, wherein the hydrogen engine is the above-mentioned hydrogen engine, and the method for controlling crankcase water removal comprises: obtaining an outlet temperature T of a coolant of the hydrogen engine; if T≤20°C, controlling V1=V2; if 20°C<T≤70°C, controlling V1=2*V2; if 70°C<T≤100°C, controlling V1=V2; if T>100°C, controlling V1=0; wherein V1 is an air supply volume of the air supply pipeline, and V2 is an air leakage volume of the hydrogen engine.

[0017] According to the crankcase water removal control method of the hydrogen engine according to the embodiment of the present invention, the air supply volume of the air supply pipeline is controlled according to the outlet temperature of the coolant of the hydrogen engine, which can effectively reduce the risk of water vapor in the crankcase condensing into liquid water and reduce the risk of oil emulsification in the crankcase.

[0018] According to some embodiments of the present invention, the crankcase water removal control method also includes: recording the continuous running time H of T≤60℃, if H>2h, controlling the hydrogen engine to increase the load so that T≥80℃ and lasts for a first preset time, and controlling V1=2*V2.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a crankcase water removal system, an intake system and a crankcase according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a hydrogen engine according to an embodiment of the present invention;

[0022] Figure 3 is a flow chart of a crankcase water removal control method according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] Air supply pipeline 1; air outlet pipeline 2; connecting branch 21; air outlet branch 22; first air outlet branch 22a; second air outlet branch 22b; oil-gas separator 3; medium inlet 31; air outlet 32; first air outlet 32a; second air outlet 32b; air supply control valve 4; first one-way valve 5; second one-way valve 6;

[0025] Crankcase water removal system 10;

[0026] Intake system 20; air filter 201; supercharger 202; throttle valve 203;

[0027] Crankcase 30; cylinder block 40; cylinder head 50; cover 60;

[0028] A hydrogen engine 100 . DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Combine the following Figure 1-Figure 3 The crankcase water removal system 10 , the hydrogen engine 100 , and the water removal control method according to the embodiments of the present invention are described in detail.

[0034] Reference Figure 1 and Figure 2As shown, a crankcase water removal system 10 according to an embodiment of the present invention is used for a hydrogen engine 100. The crankcase water removal system 10 includes: an air supply pipeline 1, an air outlet pipeline 2 and an oil-gas separator 3. At least a portion of the air supply pipeline 1 is arranged inside the hydrogen engine 100. One end of the air supply pipeline 1 is suitable for communicating with the atmosphere, and the other end of the air supply pipeline 1 is suitable for communicating with the crankcase 30 of the hydrogen engine 100. The oil-gas separator 3 is arranged on the air outlet pipeline 2. One end of the air outlet pipeline 2 is suitable for communicating with the crankcase 30, and the other end of the air outlet pipeline 2 is suitable for communicating with the intake system 20 of the hydrogen engine 100. The oil-gas separator 3 is used to filter the oil in the medium flowing through the air outlet pipeline 2 to prevent the oil from flowing into the intake system 20, thereby preventing the oil from entering the cylinder of the hydrogen engine 100.

[0035] Among them, the crankcase 30 can be located at the bottom of the hydrogen engine 100, the exhaust pipe 2 can be connected to the crankcase 30 through the air intake port of the crankcase 30, at least part of the air supply pipe 1 can be arranged in the cylinder body 40, the cylinder head 50 and the cover 60 of the hydrogen engine 100, the air supply pipe 1 can be connected to the atmosphere through the air supply port of the air supply pipe 1, and the air supply port is located on the cover 60 at the top of the hydrogen engine 100. The medium can be a mixture of oil, exhaust gas and air in the crankcase 30, and the oil can be engine oil.

[0036] It can be understood that air in the atmosphere can enter the crankcase 30 through the air supply pipe 1, and the air can be mixed with the exhaust gas leaking from the cylinder into the crankcase 30 in the crankcase 30 to reduce the concentration of water vapor in the crankcase 30 and avoid supersaturation of water vapor to precipitate liquid water, which is beneficial to reduce the risk of emulsification of oil in the crankcase 30 and ensure the lubricating performance of the oil, thereby helping to reduce the wear of components in the crankcase 30 (for example: crankshaft, connecting rod, etc.) and increase the service life of the hydrogen engine 100.

[0037] After the air is mixed with the exhaust gas in the crankcase 30, it can enter the intake system 20 through the exhaust pipe 2, and enter the cylinder through the intake system 20 to discharge the gas in the crankcase 30, realize the ventilation of the crankcase 30, remove the moisture in the crankcase 30, and realize the dehydration function. The exhaust gas entering the cylinder can dilute the oxygen concentration in the cylinder, which is conducive to reducing the possibility of knocking. The reduction in oxygen concentration is also conducive to more stable hydrogen combustion, which is conducive to improving the thermal efficiency of the hydrogen engine 100.

[0038] In addition, when the hydrogen engine 100 is working, the heat generated by the combustion of hydrogen can heat the hydrogen engine 100. At least part of the air supply pipeline 1 is arranged inside the hydrogen engine 100. When the air supply pipeline 1 supplies air to the crankcase 30, the air can be heated by the hydrogen engine 100 when flowing through the air supply pipeline 1. The heated air flows into the crankcase 30 to heat the crankcase 30, reducing the risk of water vapor in the crankcase 30 condensing into liquid water. In addition, even if there is liquid water in the crankcase 30, the heated air flows into the crankcase 30 to heat the liquid water, causing the liquid water to evaporate into water vapor, thereby helping to reduce the risk of oil emulsification and ensure the lubricating performance of the oil, thereby helping to reduce the wear of parts in the crankcase 30 and increase the service life of the hydrogen engine 100.

[0039] According to the crankshaft water removal system of the embodiment of the present invention, at least a portion of the air supply pipeline 1 is arranged inside the hydrogen engine 100, and the air supply pipeline 1 is connected to the crankcase 30 of the hydrogen engine 100. The air supply pipeline 1 can add air to the crankcase 30 to reduce the concentration of water vapor in the crankcase 30, and the air can be heated by the hydrogen engine 100 when entering the crankcase 30 from the air supply pipeline 1, which is beneficial to reduce the risk of water vapor in the crankcase 30 condensing into liquid water and reducing the risk of oil emulsification in the crankcase 30.

[0040] In some embodiments of the present invention, reference Figure 1 and Figure 2 As shown, the crankcase water removal system 10 further includes: an air supply control valve 4, which is arranged in the air supply pipeline 1, and is used to control the air supply amount of the air supply pipeline 1 to adjust the flow rate of air entering the crankcase 30, thereby adjusting the water removal capacity of the crankcase water removal system 10. The air supply control valve 4 can be a proportional solenoid valve.

[0041] It can be understood that when the air supply control valve 4 increases the air supply volume of the air supply pipeline 1, the air entering the crankcase 30 increases, and the dehydration capacity of the crankcase water removal system 10 is improved, which can effectively reduce the risk of water vapor in the crankcase 30 condensing into liquid water and reduce the risk of oil emulsification in the crankcase 30.

[0042] When the air supply control valve 4 reduces the air supply volume of the air supply pipeline 1, the air entering the crankcase 30 is reduced, and the dehydration capacity of the crankcase dehydration system 10 is appropriately reduced to avoid a large amount of air carrying a large amount of oil when flowing to the exhaust pipeline 2, so as to ensure the lubrication of the components in the crankcase 30.

[0043] In some embodiments of the present invention, reference Figure 1As shown, the air intake system 20 includes: an air filter 201, and the air supply pipeline 1 is suitable for being connected to the atmosphere through the air filter 201. The air filter 201 is suitable for filtering impurities such as dust in the atmosphere to prevent the hydrogen engine 100 from inhaling air with impurities during operation, and to avoid impurities from wearing the components in the hydrogen engine 100, thereby helping to reduce the risk of damage to the hydrogen engine 100 and prolonging the service life of the hydrogen engine 100.

[0044] In some embodiments of the present invention, reference Figure 1 As shown, the intake system 20 also includes: a supercharger 202 and a throttle valve 203. The air filter 201 is connected to the throttle valve 203 through the supercharger 202. The exhaust pipe 2 is suitable for being connected to the inlet of the supercharger 202 and / or the outlet of the throttle valve 203. The air in the atmosphere can enter the cylinder of the hydrogen engine 100 through the air filter 201, the supercharger 202 and the throttle valve 203 in sequence. The supercharger 202 is suitable for increasing the pressure and flow rate of the air, and the throttle valve 203 is suitable for adjusting the flow rate of the air entering the cylinder from the intake system 20.

[0045] In some embodiments, the exhaust pipe 2 is connected to the inlet of the supercharger 202. When the hydrogen engine 100 is in a high-load working state, the throttle valve 203 can increase the flow rate of air entering the cylinder from the intake system 20, and the supercharger 202 can inhale a large amount of air from the inlet of the supercharger 202. A negative pressure is formed at the inlet of the supercharger 202, and the gas in the exhaust pipe 2 can be sucked into the supercharger 202 for supercharging. The supercharged gas can flow into the cylinder through the throttle valve 203 to participate in combustion.

[0046] In other embodiments, the exhaust pipe 2 is connected to the outlet of the throttle valve 203. When the hydrogen engine 100 is in a low-load working state, the throttle valve 203 can reduce the flow rate of air entering the cylinder from the intake system 20, and a negative pressure is formed at the outlet of the throttle valve 203. The gas in the exhaust pipe 2 can be sucked into the outlet of the throttle valve 203 and flow into the cylinder to participate in combustion.

[0047] In some other embodiments, the outlet pipe 2 is connected to the inlet of the supercharger 202 and the outlet of the throttle valve 203. When the engine is in a high-load working state, the gas in the outlet pipe 2 can flow into the intake system 20 through the inlet of the supercharger 202, and then flow into the cylinder. When the engine is in a low-load working state, the gas in the outlet pipe 2 can flow into the intake system 20 through the outlet of the throttle valve 203, and then flow into the cylinder.

[0048] In some embodiments of the present invention, reference Figure 1 and Figure 2As shown, the outlet pipeline 2 includes: a connecting branch 21 and a plurality of outlet branches 22, at least a portion of each outlet branch 22 is arranged inside the hydrogen engine 100, and the oil-gas separator 3 has a medium inlet 31, an oil outlet and a plurality of outlets 32, and the plurality of outlets 32 correspond one-to-one to the plurality of outlet branches 22, wherein the connecting branch 21 is suitable for connecting the crankcase 30 and the medium inlet 31, and the oil outlet is used to discharge the filtered oil into the crankcase 30, and each outlet 32 ​​is suitable for connecting with the inlet of the supercharger 202 and / or the outlet of the throttle valve 203 through the corresponding outlet branch 22.

[0049] It can be understood that the medium in the crankcase 30 can flow to the medium inlet 31 of the oil-gas separator 3 through the connecting branch 21, and flow into the oil-gas separator 3 through the medium inlet 31. The oil-gas separator 3 can separate the oil and gas in the medium. The oil can be discharged into the crankcase 30 through the oil outlet to prevent the oil from entering the cylinder. The gas in the medium can flow into the corresponding multiple outlet branches 22 through multiple outlets 32, and flow to the intake system 20 through the inlet of the supercharger 202 and / or the outlet of the throttle valve 203. At least part of the outlet branch 22 is arranged inside the hydrogen engine 100. When the gas flows through the outlet branch 22, the gas can be heated by the hydrogen engine 100 to prevent the water vapor in the gas from condensing into liquid water, and prevent the liquid water from flowing into the cylinder through the intake system 20, thereby helping to reduce the risk of water entering the cylinder.

[0050] In some embodiments of the present invention, reference Figure 1 and Figure 2 As shown, the multiple air outlet branches 22 include: a first air outlet branch 22a and a second air outlet branch 22b, the cross-sectional area of ​​the first air outlet branch 22a is larger than the cross-sectional area of ​​the second air outlet branch 22b, and the multiple air outlets 32 include: a first air outlet 32a and a second air outlet 32b, the first air outlet 32a is suitable for being connected to the inlet of the supercharger 202 through the first air outlet branch 22a, and the second air outlet 32b is suitable for being connected to the outlet of the throttle valve 203 through the second air outlet branch 22b.

[0051] It can be understood that when the engine is in a high-load working state, a negative pressure is formed at the inlet of the supercharger 202, and the gas separated by the oil-gas separator 3 can flow to the inlet of the supercharger 202 through the first outlet branch 22a, and enter the cylinder through the supercharger 202 and the throttle valve 203 in turn, and the air in the gas can participate in the combustion. The cross-sectional area of ​​the first outlet branch 22a is large, which can increase the air intake of the cylinder, thereby helping to improve the working efficiency of the hydrogen engine 100.

[0052] When the engine is in a low-load working state, negative pressure is formed at the outlet of the throttle valve 203. The gas separated by the oil-gas separator 3 can flow to the outlet of the throttle valve 203 through the second outlet branch 22b and directly flow into the cylinder. The air in the gas can participate in the combustion. The cross-sectional area of ​​the second outlet branch 22b is small, which reduces the air intake of the cylinder and ensures that the engine is in a low-load working state.

[0053] In some embodiments of the present invention, reference Figure 2 As shown, at least a portion of the first outlet branch 22a may be disposed in the cover 60 of the hydrogen engine 100, and at least a portion of the second outlet branch 22b may be disposed in the cover 60 and the cylinder head 50 of the hydrogen engine 100. When the gas flows through the first outlet branch 22a or the second outlet branch 22b, the gas may be heated by the hydrogen engine 100 to prevent water vapor in the gas from condensing into liquid water, thereby preventing liquid water from flowing into the cylinder through the intake system 20, thereby helping to reduce the risk of water entering the cylinder.

[0054] In some embodiments of the present invention, reference Figure 2 As shown, at least part of the connecting branch 21 is disposed inside the hydrogen engine 100. When the medium in the crankcase 30 flows from the connecting branch 21 to the plurality of outlet branches 22, the hydrogen engine 100 can heat the medium to prevent the water vapor in the medium from becoming liquid water, which is beneficial to further reduce the risk of water ingress into the cylinder. Among them, at least part of the connecting branch 21 can be disposed inside the cylinder body 40, the cylinder head 50 and the cover 60 of the hydrogen engine 100.

[0055] According to the crankcase water removal system 10 of the embodiment of the present invention, the medium in the crankcase 30 can flow to the oil-gas separator 3 through the connecting branch 21, and the medium can be heated by the hydrogen engine 100 when flowing through the connecting branch 21 to reduce the risk of water vapor in the medium condensing into liquid water. After the medium is separated into gas and oil in the oil-gas separator 3, the oil can be discharged back into the crankcase 30 through the oil outlet, and the gas can flow to the intake system 20 through the first outlet branch 22a or the second outlet branch 22b. When the gas flows through the first outlet branch 22a or the second outlet branch 22b, it can be heated by the hydrogen engine 100 for the second time to increase the temperature, so as to further reduce the risk of water vapor condensing into liquid water, avoid liquid water from flowing into the intake system 20 through the first outlet branch 22a or the second outlet branch 22b, and prevent liquid water from flowing into the cylinder.

[0056] In some embodiments of the present invention, reference Figure 1As shown, the crankcase water removal system 10 also includes a first one-way valve 5 and a second one-way valve 6. The first outlet branch 22a can be unidirectionally connected to the inlet of the supercharger 202 through the first one-way valve 5, and the second outlet branch 22b can be unidirectionally connected to the outlet of the throttle valve 203 through the second one-way valve 6 to prevent the air in the intake system 20 from flowing into the crankcase 30 through the first outlet branch 22a and the second outlet branch 22b to ensure the intake amount of the cylinders of the hydrogen engine 100.

[0057] Reference Figure 1 and Figure 2 As shown, a hydrogen engine 100 according to another embodiment of the present invention comprises the crankcase water removal system 10 of the above embodiment.

[0058] According to the hydrogen engine 100 of the embodiment of the present invention, at least a portion of the air supply pipeline 1 is arranged inside the hydrogen engine 100, and the air supply pipeline 1 is connected to the crankcase 30 of the hydrogen engine 100. The air supply pipeline 1 can add air to the crankcase 30 to reduce the concentration of water vapor in the crankcase 30, and the air can be heated by the hydrogen engine 100 when entering the crankcase 30 through the air supply pipeline 1, which is beneficial to reduce the risk of water vapor in the crankcase 30 condensing into liquid water and reducing the risk of oil emulsification in the crankcase 30.

[0059] Reference Figure 3 As shown, according to a method for controlling crankcase water removal of a hydrogen engine according to another embodiment of the present invention, the hydrogen engine is the hydrogen engine of the above embodiment, and the method for controlling crankcase water removal comprises:

[0060] Step S1: obtaining the outlet temperature T of the coolant of the hydrogen engine.

[0061] The outlet temperature T of the coolant of the hydrogen engine can be detected by a temperature sensor. The temperature sensor is suitable for communication connection with the ECU of the vehicle. The temperature sensor can transmit the detected temperature signal to the ECU.

[0062] Step S2: If T≤20°C, control V1=V2.

[0063] Step S3: If 20°C<T≤70°C, control V1=2*V2.

[0064] Step S4: If 70°C<T≤100°C, control V1=V2.

[0065] Step S5: If T>100°C, control V1=0.

[0066] Among them, V1 is the air supply volume of the air supply pipeline, V2 is the leakage volume of the hydrogen engine, the leakage volume is the amount of exhaust gas leaking from the cylinder of the hydrogen engine to the crankcase, and the leakage volume of the hydrogen engine is 1% of the intake volume of the hydrogen engine. The air supply control valve can be connected to the vehicle's ECU for communication. The ECU can send a control signal to the air supply control valve according to the outlet liquid temperature T of the coolant of the hydrogen engine to control the air supply volume of the air supply pipeline.

[0067] It can be understood that when T≤20℃, the heat exchange between the coolant and the hydrogen engine is small, the heat generated by the hydrogen engine is less, the load of the hydrogen engine is lower, and the water vapor generated by the combustion of the hydrogen engine is less. V1=V2 is controlled to add a small amount of air to the crankcase to remove water.

[0068] When T is in the range of 20℃~70℃, the heat exchange between the coolant and the hydrogen engine is moderate, the heat generated by the hydrogen engine is moderate, the load of the hydrogen engine is moderate, the water vapor generated by the hydrogen engine is relatively large, and the water vapor entering the crankcase is relatively large. V1=2*V2 is controlled to add a large amount of air to the crankcase to dilute the water vapor in the crankcase and reduce the risk of water vapor condensing into liquid water.

[0069] When T is in the range of 70℃~100℃, the heat exchange between the coolant and the hydrogen engine is large, the heat generated by the hydrogen engine is large, and the temperature of the crankcase is high. V1=V2 is controlled to add a small amount of air to the crankcase to remove water.

[0070] When T>100℃, the load of the hydrogen engine is relatively large, the temperature of the hydrogen engine has reached the boiling point of water, the temperature of the crankcase is relatively high, the water vapor in the crankcase is difficult to condense into liquid water, and the risk of oil emulsification in the crankcase is relatively small, so there is no need to replenish air into the crankcase through the air replenishing pipeline.

[0071] According to the crankcase water removal control method of the hydrogen engine according to the embodiment of the present invention, the air supply volume of the air supply pipeline is controlled according to the outlet temperature of the coolant of the hydrogen engine, which can effectively reduce the risk of water vapor in the crankcase condensing into liquid water and reduce the risk of oil emulsification in the crankcase.

[0072] In some embodiments of the present invention, the crankcase water removal control method also includes: recording the continuous running time H of T≤60℃, if H>2h, controlling the hydrogen engine to increase the load so that T≥80℃ and lasts for a first preset time, and controlling V1=2*V2 to reduce the risk of water vapor in the crankcase condensing into liquid water and reducing the risk of oil emulsification in the crankcase, wherein the first preset time can be 10 minutes.

[0073] It is understandable that when T≤60℃, the temperature of the hydrogen engine is relatively low. If the hydrogen engine continues to run for more than 2h, the leakage of the hydrogen engine gradually increases, and the concentration of water vapor in the crankcase gradually increases. The risk of water vapor condensing into liquid water is relatively high. By increasing the load of the hydrogen engine so that T≥80℃ and continuing for the first preset time, the temperature of the hydrogen engine can be increased, thereby increasing the temperature of the crankcase. At the same time, V1=2*V2 is controlled to add a large amount of air to the crankcase to dilute the water vapor in the crankcase and reduce the risk of water vapor condensing into liquid water.

[0074] The crankcase water removal system implemented according to the present invention has a simple structure and is easy to implement. Through the crankcase water removal system and the strategy of intelligently controlling the air replenishment amount by the ECU, the crankcase water removal system of the hydrogen engine can be operated safely and reliably under all operating conditions, and can effectively remove moisture from the crankcase to ensure the safety of the hydrogen engine's lubrication system.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0076] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A crankcase water removal system for a hydrogen engine. It is characterized in that The crankcase water removal system comprises: An air supply pipeline (1), at least a portion of which is arranged inside the hydrogen engine, one end of the air supply pipeline (1) is suitable for communicating with the atmosphere, and the other end of the air supply pipeline (1) is suitable for communicating with a crankcase (30) of the hydrogen engine; An air outlet pipeline (2) and an oil-gas separator (3), wherein the oil-gas separator (3) is arranged on the air outlet pipeline (2), one end of the air outlet pipeline (2) is suitable for being connected to the crankcase (30), and the other end of the air outlet pipeline (2) is suitable for being connected to the intake system (20) of the hydrogen engine, and the oil-gas separator (3) is used to filter the oil in the medium flowing through the air outlet pipeline (2).

2. The crankcase water removal system according to claim 1, It is characterized in that The crankcase water removal system further comprises: an air supply control valve (4), wherein the air supply control valve (4) is arranged on the air supply pipeline (1), and the air supply control valve (4) is used to control the air supply amount of the air supply pipeline (1).

3. The crankcase water removal system according to claim 1 or 2, It is characterized in that The air intake system (20) comprises an air filter (201), and the air supply pipeline (1) is suitable for communicating with the atmosphere through the air filter (201).

4. The crankcase water removal system according to claim 3, It is characterized in that The air intake system (20) further comprises: a supercharger (202) and a throttle valve (203), and the air filter (201) is connected to the throttle valve (203) via the supercharger (202); The air outlet pipeline (2) is suitable for being connected to the inlet of the supercharger (202) and / or the outlet of the throttle valve (203).

5. The crankcase water removal system according to claim 4, It is characterized in that The gas outlet pipeline (2) comprises: a connecting branch (21) and a plurality of gas outlet branches (22), at least a portion of each gas outlet branch (22) being arranged inside the hydrogen engine; The oil-gas separator (3) has a medium inlet (31), an oil outlet and a plurality of gas outlets (32), and the plurality of gas outlets (32) correspond one to one with the plurality of gas outlet branches (22); The connecting branch (21) is suitable for connecting the crankcase (30) and the medium inlet (31), the oil outlet is used to discharge the filtered oil into the crankcase (30), and each of the air outlets (32) is suitable for connecting with the inlet of the supercharger (202) and / or the outlet of the throttle valve (203) through the corresponding air outlet branch (22).

6. The crankcase water removal system according to claim 5, It is characterized in that The plurality of air outlet branches (22) include: a first air outlet branch (22a) and a second air outlet branch (22b), wherein the cross-sectional area of ​​the first air outlet branch (22a) is greater than the cross-sectional area of ​​the second air outlet branch (22b); The plurality of air outlets (32) include: a first air outlet (32a) and a second air outlet (32b), wherein the first air outlet (32a) is adapted to be connected to the inlet of the supercharger (202) through the first air outlet branch (22a), and the second air outlet (32b) is adapted to be connected to the outlet of the throttle valve (203) through the second air outlet branch (22b).

7. The crankcase water removal system according to claim 5, It is characterized in that At least part of the connecting branch (21) is arranged inside the hydrogen engine.

8. A hydrogen engine, It is characterized in that Comprising a crankcase water removal system according to any one of claims 1-7.

9. A method for controlling the dewatering of a crankcase of a hydrogen engine, It is characterized in that The hydrogen engine is the hydrogen engine according to claim 8, and the crankcase water removal control method comprises: Obtaining the outlet temperature T of the coolant of the hydrogen engine; If T≤20℃, control V1=V2; If 20℃<T≤70℃, control V1=2*V2; If 70℃<T≤100℃, control V1=V2; If T>100℃, control V1=0; Among them, V1 is the air supply volume of the air supply pipeline, and V2 is the air leakage volume of the hydrogen engine.

10. The crankcase water removal control method according to claim 9, It is characterized in that Also includes: The continuous operation time H when T≤60°C is recorded, and if H>2h, the hydrogen engine is controlled to increase the load so that T≥80°C and lasts for a first preset time, and V1=2*V2 is controlled.

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