Scavenging control method and device for hydrogen internal combustion engine, electronic device and storage medium

Abstract

The present application discloses a scavenging control method and device for a hydrogen internal combustion engine, an electronic device, and a storage medium. The scavenging control method for a hydrogen internal combustion engine includes: acquiring a first moisture content of gas in an exhaust system of the hydrogen internal combustion engine when the hydrogen internal combustion engine is in a stalling state; controlling the hydrogen internal combustion engine to perform a first scavenging operation, if the first moisture content of gas is larger than or equal to a first preset value; and returning to the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, in response to the duration of the first scavenging operation reaching a first preset duration. The scavenging control method for a hydrogen internal combustion engine can reduce the moisture content of gas in the hydrogen internal combustion engine to a level that meets rust prevention requirements through the scavenging operation, thereby significantly reducing the probability of rusting, and keeping the moisture content of gas in the hydrogen internal combustion engine at a relatively low level, so that the hydrogen internal combustion engine is kept in a good working state, and the service life of the hydrogen internal combustion engine is extended.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen internal combustion engine, and specifically to a scavenging control method and device for a hydrogen internal combustion engine, an electronic device, and a storage medium.BACKGROUND

[0002] A hydrogen internal combustion engine is an internal combustion engine which uses hydrogen gas as fuel. Hydrogen gas is a renewable fuel with high specific energy (energy per unit mass), fast combustion speed, and high combustion temperature, which may therefore provide stronger power output. Using hydrogen gas as the fuel can help reduce dependence on fossil fuels such as petroleum and natural gas, thereby promoting the diversification and safety of the energy structure. Moreover, the main product of hydrogen combustion is water vapor, which has less negative impact on the atmospheric environment.

[0003] Since the combustion product is mainly water vapor when using hydrogen gas as the fuel, the moisture content of gas of hydrogen internal combustion engine is significantly higher than that of other fuels. An exhaust pipeline of hydrogen internal combustion engine has a temperature drop, and when the temperature of exhaust gas flowing through the exhaust pipeline drops to a certain degree, the water in the exhaust gas will condense. Therefore, the various components of hydrogen internal combustion engine are affected by high moisture content, and the probability of rusting is relatively high, which will affect the working state and service life of hydrogen internal combustion engine.

[0004] The above statements are only intended to provide background technical information related to the present application, and do not necessarily constitute the prior art.SUMMARY

[0005] An object of the present application is to provide a scavenging control method and device for a hydrogen internal combustion engine, an electronic device, and a storage medium. In order to enable a basic understanding of some aspects of the disclosed embodiments, a brief summary is provided below. This summary section is not a general comment, nor is it intended to identify key / important components or delineate the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form to serve as a prelude to the detailed description that follows.

[0006] According to an aspect of the embodiments of the present application, a scavenging control method for a hydrogen internal combustion engine is provided, which includes: acquiring a first moisture content of gas in an exhaust system of the hydrogen internal combustion engine when the hydrogen internal combustion engine is in a stalling state; controlling the hydrogen internal combustion engine to perform a first scavenging operation, if the first moisture content of gas is larger than or equal to a first preset value; and returning to the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, in response to the duration of the first scavenging operation reaching a first preset duration.

[0007] In some embodiments of the present application, the method further includes: acquiring a second moisture content of gas in a first component of the hydrogen internal combustion engine if the first moisture content of gas is smaller than the first preset value; where the first component is a component of the hydrogen internal combustion engine other than the exhaust system; controlling the hydrogen internal combustion engine to perform a second scavenging operation if the second moisture content of gas is larger than or equal to a second preset threshold; and returning to the acquiring the second moisture content of gas in the first component, in response to the duration of the second scavenging operation reaching a second preset duration.

[0008] In some embodiments of the present application, the method further includes: controlling the hydrogen internal combustion engine to power off if the second moisture content of gas is smaller than the second preset threshold.

[0009] In some embodiments of the present application, the first component includes a crankcase or a cylinder.

[0010] In some embodiments of the present application, the exhaust system includes a supercharger volute, an exhaust manifold, and an exhaust tailpipe; and first moisture content of gas sensors are arranged inside the supercharger volute, the exhaust manifold and / or the exhaust tailpipe to detect the first moisture content of gas.

[0011] In some embodiments of the present application, the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine includes: receiving the first moisture content of gas detected by the first moisture content of gas sensor, where the first moisture content of gas sensor is arranged inside the exhaust system.

[0012] In some embodiments of the present application, the acquiring the second moisture content of gas in the crankcase of the hydrogen internal combustion engine includes: receiving the second moisture content of gas detected by a second moisture content of gas sensor, where the second moisture content of gas sensor is arranged inside the first component.

[0013] According to another aspect of the embodiments of the present application, a scavenging control device for a hydrogen internal combustion engine is provided, which includes: an acquisition module, which is configured to acquire a first moisture content of gas in an exhaust system of the hydrogen internal combustion engine when the hydrogen internal combustion engine is in a stalling state; and a control module, which is configured to control the hydrogen internal combustion engine to perform a first scavenging operation, if the first moisture content of gas is larger than or equal to a first preset value; the acquisition module is further configured to return to the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, in response to the duration of the first scavenging operation reaching a first preset duration.

[0014] According to further another aspect of the embodiments of the present application, an electronic device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor; the processor executes the computer program to implement the scavenging control method for a hydrogen internal combustion engine as described in any embodiment of the present application.

[0015] According to still further another aspect of the embodiments of the present application, a computer-readable storage medium is provided, on which a computer program is stored; the computer program is executed by a processor to implement the scavenging control method for a hydrogen internal combustion engine as described in any embodiment of the present application.

[0016] The technical solution provided in one of the aspects of the embodiments of the present application may have the following advantageous effects.

[0017] The scavenging control method for a hydrogen internal combustion engine provided in the embodiments of the present application includes: acquiring a first moisture content of gas in an exhaust system of the hydrogen internal combustion engine when the hydrogen internal combustion engine is in a stalling state; controlling the hydrogen internal combustion engine to perform a first scavenging operation, if the first moisture content of gas is larger than or equal to a first preset value; and returning to the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, in response to the duration of the first scavenging operation reaching a first preset duration. In this way, the moisture content of gas in the hydrogen internal combustion engine can be lowered to a level that meets rust prevention requirements through the scavenging operation, thereby significantly reducing the probability of rusting, and keeping the moisture content of gas in the hydrogen internal combustion engine at a relatively low level, so that the hydrogen internal combustion engine is kept in a good working state, and the service life of the hydrogen internal combustion engine is extended.

[0018] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to enable a clearer understanding of the technical means of the embodiments of the present application, they can be implemented according to the content of the specification. Moreover, in order to make the above and other objects, features and advantages of the embodiments of the present application more obviously and easily understood, the specific embodiments of the present application are provided below.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to provide a clearer description of the embodiments of the present application or technical solutions in the prior art, a brief introduction will be given below to the accompanying drawings required for the description of the embodiments or the prior art. It is obvious that the accompanying drawings described below illustrate only some of the embodiments recorded in the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative efforts. FIG. 1 shows a variation curve of the moisture content in exhaust gas with excess air coefficient λ for engines with three different fuels: hydrogen gas, natural gas, and diesel. FIG. 2 shows a flowchart of a scavenging control method for a hydrogen internal combustion engine according to an embodiment of the present application. FIG. 3 shows a fitting curve of the relationship between a first preset duration and a first moisture content of gas in an embodiment of the present application. FIG. 4 shows a flowchart of a scavenging control method for a hydrogen internal combustion engine according to another embodiment of the present application. FIG. 5 shows a fitting curve of the relationship between a second preset duration and a second moisture content of gas in an embodiment of the present application. FIG. 6 shows a flowchart of a scavenging control method for a hydrogen internal combustion engine according to further another embodiment of the present application. FIG. 7 shows a structural diagram of a scavenging control device for a hydrogen internal combustion engine according to an embodiment of the present application. FIG. 8 shows a structural block diagram of an electronic device according to an embodiment of the present application. FIG. 9 shows a schematic diagram of a computer-readable storage medium according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the present application more clearly understood, further explanation of the present application will be provided below in connection with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, not to limit it. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of protection of the present application.

[0021] It can be understood by those skilled in the art that unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as those generally understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood as having meanings consistent with those in the context of the prior art, and unless specifically defined herein, they should not be interpreted to have idealized or overly formal meanings.Explanation of related terms:

[0022] Excess air coefficient: also known as "surplus air coefficient" or "excessive air coefficient", commonly referred to as "excess air coefficient", which is the ratio of the air amount actually supplied for fuel combustion to the theoretical air amount, and is an important parameter reflecting the fuel / air ratio, commonly represented by the symbol "λ". In a combustion chamber of an internal combustion engine, in order to burn the fuel as completely as possible, the air amount actually supplied must be always larger than the theoretical air amount (the exceeding portion is called "excess air amount"), that is, the excess air coefficient must be larger than 1. However, combustion theory and operational experience indicate that either λ is too large or too small (indicating that the air supply amount is too much or too less), it is adverse to combustion, that is, different combustion devices have their own optimal excess air coefficient values.

[0023] Reference is made to FIG. 1, which shows a variation curve of the moisture content in exhaust gas with λ for engines with three different fuels: hydrogen gas, natural gas, and diesel. The moisture content in exhaust gas of hydrogen internal combustion engine is significantly higher than that of other fuels. The high-moisture-content exhaust gas after hydrogen combustion in hydrogen internal combustion engine is one of the main causes of rusting in hydrogen internal combustion engine. In the prior art, the high moisture content of gas in hydrogen internal combustion engine leads to the influence of high moisture content on various components of hydrogen internal combustion engine, resulting in a higher probability of rusting and affecting the working state and service life of hydrogen internal combustion engine.

[0024] In view of the problems existing in the related art, the scavenging control method for a hydrogen internal combustion engine provided in the embodiments of the present application includes: acquiring a first moisture content of gas in an exhaust system of the hydrogen internal combustion engine when the hydrogen internal combustion engine is in a stalling state; controlling the hydrogen internal combustion engine to perform a first scavenging operation, if the first moisture content of gas is larger than or equal to a first preset value; and returning to the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, in response to the duration of the first scavenging operation reaching a first preset duration. In this way, the moisture content of gas in the hydrogen internal combustion engine can be lowered to a level that meets rust prevention requirements through the scavenging operation, thereby significantly reducing the probability of rusting, and keeping the moisture content of gas in the hydrogen internal combustion engine at a relatively low level, so that the hydrogen internal combustion engine is kept in a good working state, and the service life of the hydrogen internal combustion engine is extended.

[0025] A scavenging control method and device for a hydrogen internal combustion engine, an electronic device, and a storage medium proposed according to the embodiments of the present application will be described below in connection with the accompanying drawings.

[0026] As shown in FIG. 2, an embodiment of the present application provides a scavenging control method for a hydrogen internal combustion engine, which may include steps S10-S70.

[0027] S10: acquiring a first moisture content of gas in an exhaust system of the hydrogen internal combustion engine when the hydrogen internal combustion engine is in a stalling state.

[0028] The exhaust system is a part of a hydrogen internal combustion engine, and it includes components such as a supercharger volute, an exhaust manifold, and an exhaust tailpipe. When a normally operating hydrogen internal combustion engine receives a shutdown command, a hydrogen supply valve is first cut off; then, as a hydrogen rail pressure continues to decrease, a hydrogen injection valve cannot be opened, and the in-cylinder injection action cannot be completed. The hydrogen internal combustion engine stalls. At this time, the fuel in a hydrogen supply pipeline is completely consumed, preventing the risk of fuel leakage.

[0029] For example, first moisture content of gas sensors are arranged inside the supercharger volute, the exhaust manifold and / or the exhaust tailpipe to detect the first moisture content of gas.

[0030] For example, the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine may include: receiving the first moisture content of gas detected by the first moisture content of gas sensor, where the first moisture content of gas sensor is arranged inside the exhaust system.

[0031] Specifically, the first moisture content of gas sensors can be arranged inside the supercharger volute, the exhaust manifold and / or the exhaust tailpipe of the exhaust system, that is, they can acquire the moisture content of gas inside the supercharger volute, the exhaust manifold and / or the exhaust tailpipe.

[0032] In another embodiment, multiple first moisture content of gas sensors can be arranged in the exhaust system of the hydrogen internal combustion engine in advance. After the moisture content values detected by the multiple first moisture content of gas sensors are received, an average valve of the moisture content values is calculated, and this average value is used as the first moisture content of gas. In this way, the obtained first moisture content of gas can more accurately reflect the moisture content of gas of the exhaust system.

[0033] The crankcase, cylinder, and exhaust system are all part of the hydrogen internal combustion engine. The exhaust system includes components such as the supercharger volute, the exhaust manifold, and the exhaust tailpipe.

[0034] For example, multiple first moisture content of gas sensors can be arranged on inner side walls of the supercharger volute, the exhaust manifold and / or the exhaust tailpipe. After the moisture content values detected by the multiple first moisture content of gas sensors are received, an average valve of the moisture content values is calculated, and this average value is used as the first moisture content of gas. In this way, the obtained first moisture content of gas can more accurately reflect the moisture content of gas inside the exhaust system.

[0035] S20: controlling the hydrogen internal combustion engine to perform a first scavenging operation, if the first moisture content of gas is larger than or equal to the first preset value.

[0036] The first preset value is the moisture content value that meets the rust prevention requirements, that is, when the first moisture content of gas is larger than or equal to the first preset value, the probability of rusting inside the hydrogen internal combustion engine is high, especially in the exhaust system, and the rust prevention requirements are not met at this time. The first preset value can be pre-set based on empirical or experimental data. If the first moisture content of gas is larger than or equal to the first preset value, it indicates that the moisture content of gas in the exhaust system of the hydrogen internal combustion engine does not meet the rust prevention requirements, and it is necessary to reduce the moisture content of gas in the exhaust system. Therefore, a scavenging operation needs to be performed.

[0037] Specifically, a starter motor of the hydrogen internal combustion engine can be controlled to drive the hydrogen internal combustion engine to perform the first scavenging operation. When performing the scavenging operation, the starter motor of the internal combustion engine is controlled to start. The starter motor meshes with a flywheel ring gear of the internal combustion engine. At this time, the hydrogen injection valve is in a closed state and will not inject hydrogen fuel. The starter motor drives the crank and connecting rod mechanism of the internal combustion engine to rotate, driving the piston to move upward. The internal combustion engine enters the exhaust working mode to achieve the purpose of scavenging the high-moisture-content exhaust gas in the cylinder.

[0038] S30: returning to the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, in response to the duration of the first scavenging operation reaching a first preset duration.

[0039] In order to prevent excessive heat generation due to a prolonged operating time of the starter motor, a driving time is set to not exceed the first preset duration. The first preset duration can be pre-set based on empirical or experimental data, such as 12 seconds or other durations. When the duration of the first scavenging operation reaches the first preset duration, a very large part of the exhaust gas with high moisture content in the exhaust system is discharged. At this time, the process returns to the step of acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, and this is executed cyclically until the first moisture content of gas is smaller than the first preset value, and then subsequent operations are performed.

[0040] For example, the first preset duration may be pre-set based on the first moisture content of gas δ in the exhaust system, where the relationship between the first preset duration t 1 and the first moisture content of gas δ is: t 1 = − 57 δ 2 + 72 δ − 9 .

[0041] When 0<t 1 ≤a first threshold, the hydrogen internal combustion engine is controlled to perform the first scavenging operation after starting until the first preset duration is reached, and the hydrogen internal combustion engine only needs to start once in the entire process; when t 1 is larger than the first threshold, the hydrogen internal combustion engine is controlled to start for multiple times. The total duration of the first scavenging operation performed after each startup in these multiple startups is the first preset duration t 1 . The duration of the first scavenging operation performed after each startup of the starter motor does not exceed the first threshold, which can prevent the starter motor from operating for a too long duration for a single time and effectively prevent the starter motor from overheating due to a too long operating duration for a single time. The interval between two adjacent startups can be set according to actual application needs; for example, it can be set to a duration of 3 seconds, so that the next startup is carried out after the starter motor cools down. In addition, after each startup of the starter motor, sensor detection data can be called to verify the scavenging strategy. If the verification result shows that the current scavenging strategy is not suitable, the current scavenging strategy can be adjusted. The first threshold can be pre-set according to actual needs; for example, it can be set to a duration of 12 seconds, etc.

[0042] The relationship between the first preset duration t 1 and the first moisture content of gas δ can be obtained by fitting historical data. In one example, the fitting curve of this relationship is shown in FIG. 3.

[0043] In some embodiments, when the first moisture content of gas is smaller than the first preset value, the moisture content of gas of the exhaust system meets the rust prevention requirements. At this time, the hydrogen internal combustion engine can be powered off, so that the starter motor of the hydrogen internal combustion engine is powered off.

[0044] The executing subject of the scavenging control method for a hydrogen internal combustion engine in the embodiment of the present application includes but is not limited to the automotive electronic control unit ECU.

[0045] Referring to FIG. 4, in some other embodiments, in order to further reduce the moisture content of gas inside the hydrogen internal combustion engine, the control method may further include: S40: acquiring a second moisture content of gas in a first component of the hydrogen internal combustion engine if the first moisture content of gas is smaller than the first preset value.

[0046] A hydrogen internal combustion engine includes multiple components such as the exhaust system, the crankcase, and the cylinder. The first component is a component of the hydrogen internal combustion engine other than the exhaust system; for example, the first component may include the crankcase or the cylinder or another component. Taking the first component being the crankcase as an example, the second moisture content of gas in the crankcase of the hydrogen internal combustion engine is acquired for facilitating subsequent further reduction of the moisture content of gas in the crankcase.

[0047] In some embodiments, the acquiring the second moisture content of gas in the first component of the hydrogen internal combustion engine may be acquiring the second moisture content of gas in the crankcase, or it may be acquiring the second moisture content of gas in the cylinder. The pressure and temperature inside the crankcase are relatively low. Compared to placing the sensor inside the cylinder, placing the sensor inside the crankcase can help extend the service life of the sensor.

[0048] In some embodiments, the acquiring the second moisture content of gas in the first component of the hydrogen internal combustion engine may include: receiving the second moisture content of gas detected by a second moisture content of gas sensor, where the second moisture content of gas sensor is arranged inside the first component. Taking the first component being the crankcase as an example, the second moisture content of gas sensor is arranged inside the crankcase.

[0049] In another embodiment, multiple second moisture content of gas sensors can be arranged in the crankcase of the hydrogen internal combustion engine in advance. After the moisture content values detected by the multiple second moisture content of gas sensors are received, an average valve of the moisture content values is calculated, and this average value is used as the second moisture content of gas. In this way, the obtained second moisture content of gas can more accurately reflect the moisture content of gas inside the crankcase.

[0050] For example, the first moisture content of gas in the exhaust system is acquired first, and then the second moisture content of gas in the crankcase is acquired if the first moisture content of gas is smaller than the first preset value.

[0051] S50: controlling the hydrogen internal combustion engine to perform a second scavenging operation if the second moisture content of gas is larger than or equal to the second preset threshold.

[0052] Taking the first component being the crankcase as an example, the second moisture content of gas is the moisture content of gas in the crankcase. If the second moisture content of gas is larger than or equal to the second preset threshold, it indicates that the moisture content of gas in the crankcase is too high, which will cause the crankcase to rust easily. Therefore, a second scavenging operation needs to be performed. Specifically, the starter motor of the hydrogen internal combustion engine can be controlled to drive the hydrogen internal combustion engine to perform the second scavenging operation.

[0053] S60: returning to the acquiring the second moisture content of gas in the first component, in response to the duration of the second scavenging operation reaching a second preset duration.

[0054] The second preset duration may be or may not be equal to the first preset duration. The setting of the second preset duration is also to prevent the starter motor from overheating due to a prolonged operating time. Taking the first component being the crankcase as an example, when the duration of the second scavenging operation reaches the second preset duration, another very large part of the exhaust gas with high moisture content in the hydrogen internal combustion engine is discharged. At this time, the process returns to the step of acquiring the second moisture content of gas in the crankcase of the hydrogen internal combustion engine, and this is executed cyclically until the second moisture content of gas is smaller than the second preset value, and then subsequent operations are performed.

[0055] For example, the second preset duration for the starter motor to perform the second scavenging operation is determined based on the second moisture content of gas η in the crankcase detected by the sensor, where the relationship between the second preset duration t 2 and the second moisture content of gas η is: t 2 = − 136 η 2 + 114 η − 11 .

[0056] When 0<t 2 ≤the first threshold, the hydrogen internal combustion engine is controlled to perform the second scavenging operation after starting until the second preset duration is reached, and the hydrogen internal combustion engine only needs to start once in the entire process; when t 2 is larger than the first threshold, the hydrogen internal combustion engine is controlled to start for multiple times. The total duration of the first scavenging operation performed after each startup in these multiple startups is the second preset duration t 2 . The duration of the first scavenging operation performed after each startup does not exceed the first threshold, which can prevent the starter motor from operating for a too long duration for a single time and effectively prevent the starter motor from overheating due to a too long operating duration for a single time. The interval between two adjacent startups can be set according to actual application needs; for example, it can be set to a duration of 3 seconds, so that the next startup is carried out after the starter motor cools down. The first threshold can be pre-set according to actual needs; for example, it can be set to a duration of 12 seconds, etc. In addition, after each startup of the starter motor, sensor detection data can be called to verify the scavenging strategy. If the verification result shows that the current scavenging strategy is not suitable, the current scavenging strategy can be adjusted.

[0057] The relationship between the second preset duration t 2 and the second moisture content of gas η can be obtained by fitting historical data. In one example, the fitting curve of this relationship is shown in FIG. 5.

[0058] The strategy of first detecting the moisture content of gas in the exhaust system and then detecting the moisture content of gas in the crankcase can shorten the discharge time of high-moisture-content gas in the cylinder, and reduce the number of startups and working time of the starter motor.

[0059] In some embodiments, the control method may also include: S70: controlling the hydrogen internal combustion engine to power off if the second moisture content of gas is smaller than the second preset threshold.

[0060] Since the first moisture content of gas has been detected before each detection of the second moisture content of gas and the first moisture content of gas is smaller than the first preset value, when the second moisture content of gas is smaller than the second preset threshold, the first moisture content of gas is also smaller than the first preset value, which indicates that after the scavenging operation, the internal moisture content of gas of the hydrogen internal combustion engine has met the rust prevention requirements at this time. That is, the starter motor can be controlled to shut down, and the hydrogen internal combustion engine can be controlled to power off, so that the entire vehicle can be powered off.

[0061] In some embodiments, it is also possible to continue to detect the moisture content of gas in other parts inside the hydrogen internal combustion engine, and perform the scavenging operation when the moisture content of gas does not meet the rust prevention requirements; a detailed description thereof will be omitted herein.

[0062] The above description of various embodiments tends to emphasize the differences between them, and for identical or similar parts, reference may be made to each other. For the sake of simplicity, a repeated description thereof will be omitted herein.

[0063] As shown in FIG. 6, a specific process of the scavenging control method in a specific example may include the following steps 1) to 6). 1) Multiple moisture content of gas sensors are placed in the crankcase of the hydrogen internal combustion engine, as well as in the supercharger volute, the exhaust manifold and the exhaust tailpipe of the exhaust system. 2) The hydrogen supply valve is closed when the normally operating hydrogen internal combustion engine receives a shutdown command. 3) As the hydrogen rail pressure continues to decrease, the hydrogen injection valve cannot be opened, and the in-cylinder injection action cannot be completed; the hydrogen internal combustion engine stalls; at this time, the fuel in the hydrogen supply pipeline is completely consumed, preventing the risk of leakage at a later stage. 4) The moisture content of gas δ in the exhaust system is detected after the internal combustion engine stalls. a) If the moisture content of gas δ<A, the process proceeds to the execution of the next work instruction. For example, the value of A can be 0.05, 0.03, 0.04, 0.06, 0.07, etc., which can be specifically selected according to the differences in hydrogen internal combustion engine models, materials and processes, etc. b) If the moisture content of gas δ≥A, the starter motor of the internal combustion engine is controlled to start, and the starter motor meshes with the flywheel ring gear of the internal combustion engine; at this time, the hydrogen injection valve is in a closed state and will not inject hydrogen fuel; the starter motor drives the crank and connecting rod mechanism of the internal combustion engine to rotate, and the piston moves upward to enter the exhaust cycle, achieving the purpose of scavenging the high-moisture-content exhaust gas in the cylinder. In order to prevent the starter motor from overheating, a driving time is set to not exceed a preset duration.

[0064] The preset duration can be set based on experimental or empirical data, and a specific example of the preset duration can be 12 seconds.

[0065] For example, the working time t 1 of the starter motor can be determined based on the moisture content of gas δ in the exhaust system, where the relationship between the time t 1 for the starter motor to drive the engine to scavenge and the moisture content of gas δ is: t 1 = − 57 δ 2 + 72 δ − 9 .

[0066] When 0<t 1 ≤the first threshold, the starter motor only needs to start once; when t 1 >the first threshold, the starter motor needs to start for multiple times, and the operating time of the starter motor after each startup does not exceed the first threshold. The interval between two adjacent startups can be set according to actual application needs; for example, it can be set to a duration of 3 seconds, etc. In addition, after each startup of the starter motor, sensor detection data can be called to verify the scavenging strategy. If the verification result shows that the current scavenging strategy is not suitable, the current scavenging strategy can be adjusted.

[0067] After completion of scavenging in the cylinder for one working cycle of the starter motor, the moisture content of gas sensor in the exhaust system continues to detect the moisture content δ, and this is executed cyclically until the condition of δ<A is met, and then the next working step is entered.

[0068] 5) If the moisture content of gas in the exhaust system δ<A, then the moisture content η in the crankcase is detected. a) If the moisture content of gas η<B, then the process proceeds to the execution of the next work instruction. When detecting the moisture content of gas in the crankcase, different values of B are selected according to the differences in hydrogen internal combustion engine models, materials and processes. For example, B can be 0.10, 0.08, 0.2, 0.3, etc. b) If the moisture content of gas η≥B, the starter motor of the internal combustion engine is controlled to start, and the starter motor meshes with the flywheel ring gear of the internal combustion engine; at this time, the hydrogen injection valve is in a closed state and will not inject hydrogen fuel; the starter motor drives the crank and connecting rod mechanism of the internal combustion engine to rotate, and the piston moves upward to enter the exhaust cycle, achieving the purpose of scavenging the high-moisture-content exhaust gas in the cylinder. In order to prevent the starter motor from overheating, a driving time is set to not exceed a preset duration. For example, a specific example of the preset duration is 12 seconds. After completion of scavenging for one working cycle of the starter motor, the moisture content of gas sensor arranged in the crankcase continues to detect the moisture content of gas η, and this is executed cyclically until the condition of η<B is met, and then the next working stage is entered.

[0069] The working duration of the starter motor is determined based on the moisture content of gas η detected by the sensor in the crankcase, where the relationship between the time t 2 for the starter motor to drive the engine to scavenge and the moisture content of gas η is: t 2 = − 136 η 2 + 114 η − 11 .

[0070] When 0<t 1 ≤the first threshold, the starter motor only needs to start once; when t 1 >the first threshold, the starter motor needs to start for multiple times, and the operating duration of the starter motor after each startup does not exceed the first threshold. The interval between two adjacent startups can be set according to actual application needs; for example, it can be set to a duration of 3 seconds, etc. The first threshold is for example 12 seconds. In addition, after each startup of the starter motor, sensor detection data can be called to verify the scavenging strategy according to the called sensor detection data. If the verification result shows that the current scavenging strategy is not suitable, the current scavenging strategy can be adjusted.

[0071] 6) When the moisture content of gas in the crankcase η<B, the moisture content of gas in the crankcase is within the safe limit for rust prevention, and the internal combustion engine is powered off to complete the shutdown command.

[0072] In the above, A represents the moisture content of gas threshold for controlling the rusting risk in the exhaust system, and B represents the moisture content of gas threshold for controlling rusting risk in the crankcase. Through reliability testing, it was found that different materials and rust prevention coatings have different thresholds.

[0073] The hydrogen internal combustion engine is an important zero carbon power that conforms to the dual carbon development strategy. In view of the problem of an overly high moisture content of gas in the exhaust system and crankcase of hydrogen internal combustion engine, which leads to easy rusting, this example uses scavenging to reduce the moisture content of gas in the exhaust system and crankcase to reduce the occurrence of rusting. In the scavenging control method in this example, the high-moisture-content exhaust gas is discharged to reduce the moisture content of gas in the exhaust system and crankcase through scavenging, thereby significantly reducing the probability of rusting in the hydrogen internal combustion engine. In this example, the strategy of first detecting the moisture content of gas in the exhaust system and then detecting the moisture content of gas in the crankcase can shorten the discharge time of high-moisture-content gas in the cylinder, and reduce the number of startups and working time of the starter motor.

[0074] The above description of various embodiments tends to emphasize the differences between them, and for identical or similar parts, reference may be made to each other. For the sake of simplicity, a repeated description thereof will be omitted herein.

[0075] Referring to FIG. 7, another embodiment of the present application provides a scavenging control device for a hydrogen internal combustion engine, which includes: an acquisition module, which is configured to acquire a first moisture content of gas in an exhaust system of the hydrogen internal combustion engine when the hydrogen internal combustion engine is in a stalling state; and a control module, which is configured to control the hydrogen internal combustion engine to perform a first scavenging operation, if the first moisture content of gas is larger than or equal to a first preset value; the acquisition module is further configured to return to the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, in response to the duration of the first scavenging operation reaching a first preset duration.

[0076] For example, the acquisition module can be further configured to acquire a second moisture content of gas in a first component of the hydrogen internal combustion engine if the first moisture content of gas is smaller than the first preset value; where the first component is a component of the hydrogen internal combustion engine other than the exhaust system; the control module can be further configured to control the hydrogen internal combustion engine to perform a second scavenging operation if the second moisture content of gas is larger than or equal to a second preset threshold; and the acquisition module can be further configured to return to the acquiring the second moisture content of gas in the first component, in response to the duration of the second scavenging operation reaching a second preset duration.

[0077] The control module can be further configured to control the hydrogen internal combustion engine to power off if the second moisture content of gas is smaller than the second preset threshold.

[0078] For example, the first component includes a crankcase or a cylinder.

[0079] For example, the exhaust system includes a supercharger volute, an exhaust manifold, and an exhaust tailpipe; and the first moisture content of gas sensor is arranged inside the supercharger volute, the exhaust manifold and / or the exhaust tailpipe.

[0080] For example, the acquisition module is further specifically configured to receive the first moisture content of gas detected by the first moisture content of gas sensor, where the first moisture content of gas sensor is arranged inside the exhaust system.

[0081] For example, the acquisition module is further specifically configured to receive the second moisture content of gas detected by a second moisture content of gas sensor, where the second moisture content of gas sensor is arranged inside the first component.

[0082] The scavenging control device for a hydrogen internal combustion engine in the embodiment of the present application can reduce the moisture content of gas in the hydrogen internal combustion engine to a level that meets rust prevention requirements through the scavenging operation, thereby significantly reducing the probability of rusting, and keeping the moisture content of gas in the hydrogen internal combustion engine at a relatively low level, so that the hydrogen internal combustion engine is kept in a good working state, and the service life of the hydrogen internal combustion engine is extended.

[0083] The above description of various embodiments tends to emphasize the differences between them, and for identical or similar parts, reference may be made to each other. For the sake of simplicity, a repeated description thereof will be omitted herein.

[0084] Another embodiment of the present application provides an electronic device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor; the processor executes the computer program to implement the method as described in any of the above embodiments.

[0085] Referring to FIG. 8, the electronic device 10 may include: a processor 100, a memory 101, a bus 102, and a communication interface 103. The processor 100, the communication interface 103 and the memory 101 are connected through the bus 102; the memory 101 stores a computer program that can be run on the processor 100. When the processor 100 runs the computer program, it executes the scavenging control method for a hydrogen internal combustion engine provided in any of the aforementioned embodiments of the present application.

[0086] The memory 101 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one magnetic disk storage. The communication connection between the device network element and at least one other network element is realized through at least one communication interface 103 (which can be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network and the like can be used.

[0087] The bus 102 can be ISA bus, PCI bus, or EISA bus, etc. The buses can be divided into address buses, data buses, control buses, etc. The memory 101 is used to store a program, and the processor 100 executes the program after receiving an execution instruction. The method disclosed in any of the embodiments of the present application described above can be applied to the processor 100 or implemented by the processor 100.

[0088] The processor 100 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed through integrated logic circuits of hardware in the processor 100, or through instructions in the form of software. The processor 100 mentioned above can be a general-purpose processor, which can include a central processing Unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logic diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly reflected as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in mature storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers, etc. The storage medium is located in the memory 101, and the processor 100 reads the information from the memory 101 and completes the steps of the above method in combination with its hardware.

[0089] The electronic device provided in the embodiments of the present application is based on the same inventive concept as the method provided in the embodiments of the present application, and has the same advantageous effects as the method adopted, operated or implemented by the electronic device.

[0090] Another embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and the computer program is executed by a processor to implement the scavenging control method for a hydrogen internal combustion engine according to any of the above embodiments. Referring to FIG. 9, the computer-readable storage medium shown is an optical disc 20, on which a computer program (i.e., a program product) is stored; when executed by a processor, the computer program will perform the method provided in any of the aforementioned embodiments.

[0091] It should be noted that examples of the computer-readable storage media may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory, or other optical and magnetic storage media, which will not be list exhaustively herein.

[0092] The computer-readable storage medium provided in the above embodiments of the present application is based on the same inventive concept as the method provided in the embodiments of the present application, and has the same advantageous effects as the method adopted, operated or implemented by the application program stored on the computer-readable storage medium.

[0093] It should be noted that: the term "module" is not intended to be limited to a specific physical form. Depending on the specific application, the modules can be implemented as hardware, firmware, software, and / or a combination thereof. In addition, different modules can share common components or even be implemented by the same components. There may be or may not be clear boundaries between different modules.

[0094] The algorithms and displays provided herein are not inherently related to any specific computer, virtual device, or other devices. Various general-purpose devices can also be used with the examples based on this. According to the above description, the structure required to construct such a device is obvious. Further, the present application is not aimed at any specific programming language. It should be understood that various programming languages can be used to implement the contents of the present application described herein, and the description of specific languages above is intended to disclose the best embodiments of the present application.

[0095] It should be understood that although the various steps in the flowchart of the drawings are displayed sequentially as indicated by the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise specified in the context, there is no strict order limit for the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the flowchart of the drawings may include multiple sub steps or stages, which are not necessarily executed and completed at the same time, but can be executed at different times. Their execution order is also not necessarily sequential, but can be executed in turn or alternately with other steps or sub steps of other steps or at least some of the stages.

[0096] The above embodiments only illustrate implementations of the present application, and their descriptions are relatively specific and detailed, but should not be understood as limiting the scope of the present patent application. It should be pointed out that for those skilled in the art, several modifications and improvements can also be made without departing from the concept of the present application, which are all within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the appended claims.

Claims

1. A scavenging control method for a hydrogen internal combustion engine, <b>characterized by comprising: acquiring a first moisture content of gas in an exhaust system of the hydrogen internal combustion engine when the hydrogen internal combustion engine is in a stalling state; controlling the hydrogen internal combustion engine to perform a first scavenging operation, if the first moisture content of gas is larger than or equal to a first preset value; and returning to the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, in response to the duration of the first scavenging operation reaching a first preset duration.

2. The scavenging control method for a hydrogen internal combustion engine according to claim 1, further comprising: acquiring a second moisture content of gas in a first component of the hydrogen internal combustion engine if the first moisture content of gas is smaller than the first preset value; wherein the first component is a component of the hydrogen internal combustion engine other than the exhaust system; controlling the hydrogen internal combustion engine to perform a second scavenging operation if the second moisture content of gas is larger than or equal to a second preset threshold; and returning to the acquiring the second moisture content of gas in the first component, in response to the duration of the second scavenging operation reaching a second preset duration.

3. The scavenging control method for a hydrogen internal combustion engine according to claim 2, further comprising: controlling the hydrogen internal combustion engine to power off if the second moisture content of gas is smaller than the second preset threshold.

4. The scavenging control method for a hydrogen internal combustion engine according to claim 2 or 3, wherein the first component comprises a crankcase or a cylinder.

5. The scavenging control method for a hydrogen internal combustion engine according to any one of claims 1 to 3, wherein the exhaust system comprises a supercharger volute, an exhaust manifold, and an exhaust tailpipe; and first moisture content of gas sensors are arranged inside the supercharger volute, the exhaust manifold and / or the exhaust tailpipe to detect the first moisture content of gas.

6. The scavenging control method for a hydrogen internal combustion engine according to any one of claims 1 to 3, wherein the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine comprises: receiving the first moisture content of gas detected by the first moisture content of gas sensor, wherein the first moisture content of gas sensor is arranged inside the exhaust system.

7. The scavenging control method for a hydrogen internal combustion engine according to claim 2 or 3, wherein the acquiring the second moisture content of gas in the first component of the hydrogen internal combustion engine comprises: receiving the second moisture content of gas detected by a second moisture content of gas sensor, wherein the second moisture content of gas sensor is arranged inside the first component.

8. A scavenging control device for a hydrogen internal combustion engine, <b>characterized by comprising: an acquisition module, which is configured to acquire a first moisture content of gas in an exhaust system of the hydrogen internal combustion engine when the hydrogen internal combustion engine is in a stalling state; and a control module, which is configured to control the hydrogen internal combustion engine to perform a first scavenging operation, if the first moisture content of gas is larger than or equal to a first preset value; the acquisition module is further configured to return to the acquiring the first moisture content of gas in the exhaust system of the hydrogen internal combustion engine, in response to the duration of the first scavenging operation reaching a first preset duration.

9. An electronic device (10), characterized by comprising a memory (101), a processor (100), and a computer program stored on the memory (101) and executable on the processor (100); wherein the processor (100) executes the computer program to implement the scavenging control method for a hydrogen internal combustion engine according to any one of claims 1 to 7.

10. A computer-readable storage medium, on which a computer program is stored; characterized in that the computer program is executed by a processor to implement the scavenging control method for a hydrogen internal combustion engine according to any one of claims 1 to 7.

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