Method and device for determining backfiring in a direct injection hydrogen internal combustion engine

Abstract

The application provides a method for determining whether backfire occurs in a hydrogen direct injection engine, comprising: establishing a three-dimensional data model of the hydrogen engine; performing a cycle three-dimensional simulation calculation to obtain residual hydrogen mass in an intake port, density of a mixture in the intake port, and a volume occupied by a hydrogen diffusion range in the intake port; obtaining mass of the mixture in the hydrogen diffusion range in the intake port according to the density of the mixture in the intake port and the volume occupied by the hydrogen diffusion range in the intake port; obtaining a hydrogen mass fraction in the hydrogen diffusion range in the intake port according to the residual hydrogen mass in the intake port and the mass of the mixture in the hydrogen diffusion range in the intake port; and determining that the hydrogen direct injection engine will not backfire when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is lower than a specified threshold. The application is beneficial to determining whether backfire occurs in the hydrogen engine during the design process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen internal combustion engine, and in particular to a method and device for determining whether backfire occurs in an intake port direct injection hydrogen internal combustion engine and a computing device. BACKGROUND

[0002] In the field of traditional internal combustion engines, fossil fuels still occupy a dominant position, so China still faces great pressure and difficulties in achieving this goal. Hydrogen is a clean fuel with zero carbon emissions, and is an ideal "green" fuel. In recent years, countries around the world have also been actively committed to the development of hydrogen internal combustion engines and vehicles.

[0003] According to the different hydrogen supply methods, hydrogen internal combustion engines are divided into intake port injection hydrogen internal combustion engines and cylinder direct injection hydrogen internal combustion engines. The intake port injection hydrogen internal combustion engine has the advantages of high fuel flexibility, durability and relatively low price, so the intake port injection hydrogen internal combustion engine has broad development prospects. However, due to the wide flammable range of hydrogen and the low ignition energy required for hydrogen-air mixture, backfire has become the main constraint factor limiting the development of intake port hydrogen internal combustion engines. There is a technical gap in the method for determining whether backfire will occur during the design process.

[0004] Therefore, in order to solve the above problems, there is an urgent need for a method for determining whether backfire occurs in an intake port direct injection hydrogen internal combustion engine during the design process. SUMMARY

[0005] To achieve the above-mentioned purpose, the present application provides a method, device and computing device for determining whether backfire occurs in an intake port direct injection hydrogen internal combustion engine, so as to determine whether backfire occurs in an intake port direct injection hydrogen internal combustion engine during the design process.

[0006] The first aspect of the present application provides a method for determining whether backfire occurs in an intake port direct injection hydrogen internal combustion engine, comprising:

[0007] establishing a three-dimensional data model of the intake port hydrogen internal combustion engine;

[0008] based on the three-dimensional data model of the intake port hydrogen internal combustion engine, performing three-dimensional simulation calculation of at least two working cycles using computational fluid dynamics method, obtaining the residual hydrogen mass in the intake port from the intake valve closing of the previous cycle to the intake valve opening of the next cycle, the density of the mixture in the intake port, the volume occupied by the hydrogen diffusion range in the intake port, and the cylinder temperature at the intake valve opening of the next cycle;

[0009] obtaining the mass of the mixture in the hydrogen diffusion range in the intake port according to the density of the mixture in the intake port and the volume occupied by the hydrogen diffusion range in the intake port, and obtaining the hydrogen mass fraction in the hydrogen diffusion range in the intake port according to the residual hydrogen mass in the intake port and the mass of the mixture in the hydrogen diffusion range in the intake port.

[0010] When the hydrogen mass fraction in the hydrogen diffusion range in the intake port is lower than a specified threshold value, it is determined that backfiring does not occur in the intake port direct injection hydrogen internal combustion engine.

[0011] From the above, the method for determining whether backfiring occurs in the intake port direct injection hydrogen internal combustion engine provided by the application can determine whether backfiring occurs in the design during the development of the intake port hydrogen internal combustion engine, without the need for test testing, effectively shortening the design cycle of the internal combustion engine and reducing the development cost of the hydrogen internal combustion engine.

[0012] As a possible implementation manner of the first aspect, when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is greater than or equal to a specified threshold value, and it is further determined that the in-cylinder temperature when the intake valve is opened in the next cycle is lower than the self-ignition temperature of the hydrogen-air mixture, it is determined that backfiring does not occur in the intake port direct injection hydrogen internal combustion engine.

[0013] As a possible implementation manner of the first aspect, when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is greater than or equal to a specified threshold value, and it is further determined that the in-cylinder temperature when the intake valve is opened in the next cycle is greater than or equal to the self-ignition temperature of the hydrogen-air mixture, it is determined that backfiring occurs in the intake port direct injection hydrogen internal combustion engine.

[0014] As a possible implementation manner of the first aspect, the mass of the mixture in the hydrogen diffusion range in the intake port is obtained according to the density of the mixture in the intake port and the volume occupied by the hydrogen diffusion range in the intake port, and is calculated according to the following formula:

[0015] m1 = p x V

[0016] Wherein, m1 represents the mass of the mixture in the hydrogen diffusion range in the intake port, p represents the density of the mixture in the intake port, and V represents the volume occupied by the hydrogen diffusion range in the intake port.

[0017] As a possible implementation manner of the first aspect, the mass of the hydrogen in the hydrogen diffusion range in the intake port is obtained according to the mass of the mixture in the hydrogen diffusion range in the intake port and the mass of the residual hydrogen in the intake port, and is calculated according to the following formula:

[0018]

[0019] Wherein, φ represents the hydrogen mass fraction in the hydrogen diffusion range in the intake port, m1 represents the mass of the mixture in the hydrogen diffusion range in the intake port, and m represents the mass of the residual hydrogen in the intake port.

[0020] The second aspect of the application provides a device for determining whether backfiring occurs in an intake port direct injection hydrogen internal combustion engine, comprising:

[0021] A building module is configured to build a three-dimensional data model of the intake port hydrogen internal combustion engine;

[0022] A first calculating module is configured to perform three-dimensional simulation calculation on at least two working cycles based on the three-dimensional data model of the intake port hydrogen internal combustion engine using computational fluid dynamics method, to obtain the residual hydrogen mass in the intake port, the density of the mixture in the intake port, the volume occupied by the hydrogen diffusion range in the intake port, and the cylinder temperature when the intake valve is opened in the next cycle;

[0023] A second calculating module is configured to obtain the mass of the mixture in the hydrogen diffusion range in the intake port according to the density of the mixture in the intake port and the volume occupied by the hydrogen diffusion range in the intake port;

[0024] A third calculating module is configured to obtain the hydrogen mass fraction in the hydrogen diffusion range in the intake port according to the residual hydrogen mass m in the intake port and the mass of the mixture in the hydrogen diffusion range in the intake port;

[0025] A first determining module is configured to determine that the intake port direct injection hydrogen internal combustion engine will not backfire when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is lower than a specified threshold.

[0026] In summary, the device for determining whether the intake port direct injection hydrogen internal combustion engine backfires can determine whether the design will backfire during the development of the intake port hydrogen internal combustion engine, without the need for test and test, which can effectively shorten the design cycle of the internal combustion engine and reduce the development cost of the hydrogen internal combustion engine.

[0027] As a possible implementation manner of the second aspect, the device further includes:

[0028] A second determining module is configured to determine that the intake port direct injection hydrogen internal combustion engine will not backfire when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is greater than or equal to the specified threshold, and further determine that the cylinder temperature when the intake valve is opened in the next cycle is lower than the self-ignition temperature of the hydrogen-air mixture.

[0029] As a possible implementation manner of the second aspect, the device further includes:

[0030] A third determining module is configured to determine that the intake port direct injection hydrogen internal combustion engine will backfire when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is greater than or equal to the specified threshold, and further determine that the cylinder temperature when the intake valve is opened in the next cycle is greater than or equal to the self-ignition temperature of the hydrogen-air mixture.

[0031] The third aspect of the present application provides a computing device including a memory and a processor, wherein:

[0032] A computer readable storage medium has stored thereon program instructions which, when executed by a computer, cause the computer to perform the method for determining whether backfiring occurs in the hydrogen internal combustion engine with intake port direct injection according to any one of the first aspect.

[0033] The fourth aspect of the present application provides a computer readable storage medium having stored thereon program instructions which, when executed by a computer, cause the computer to perform the method for determining whether backfiring occurs in the hydrogen internal combustion engine with intake port direct injection according to any one of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A schematic diagram of the main components of the hydrogen internal combustion engine with intake port direct injection;

[0035] Figure 2 A flowchart of the first embodiment of the method for determining whether backfiring occurs in the hydrogen internal combustion engine with intake port direct injection;

[0036] Figure 3 A flowchart of the second embodiment of the method for determining whether backfiring occurs in the hydrogen internal combustion engine with intake port direct injection;

[0037] Figure 4 A structural schematic diagram of the device for determining whether backfiring occurs in the hydrogen internal combustion engine with intake port direct injection;

[0038] Figure 5 A structural schematic diagram of the computing device.

[0039] REFERENCE SIGNS

[0040] 1 intake port; 2 hydrogen nozzle; 3 intake valve; 4 cylinder head; 5 cylinder wall; 6 piston; 7 exhaust port; 8 exhaust valve; 9 spark plug.

[0041] It should be understood that in the above structural schematic diagrams, the size and shape of each block diagram are only for reference and should not constitute exclusive interpretation of the embodiments of the present application. The relative position and inclusion relationship between each block diagram presented by the structural schematic diagram only schematically represent the structural association between each block diagram, and are not limited to the physical connection mode of the embodiments of the present application. DETAILED DESCRIPTION

[0042] It should be understood that the selection scheme of the supercharger of the supercharged hydrogen internal combustion engine provided by the embodiments of the present application includes the selection method of the supercharger of the supercharged hydrogen internal combustion engine, the selection device of the supercharger of the supercharged hydrogen internal combustion engine, the supercharged hydrogen internal combustion engine, the computing device and the computer readable storage medium, etc. Since the principles of the technical solutions solving the problems are the same or similar, in the introduction of the following specific embodiments, some repeated parts may not be described again, but should be regarded as mutual reference between the specific embodiments, which can be combined with each other.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. If there is a conflict between the definitions in the specification and those in the patent specification, the definitions in the specification are intended to prevail. In addition, the terms used herein are for the purpose of describing the embodiments of the present application only and are not intended to limit the present application. In order to accurately describe the technical content in the present application and to accurately understand the present application, the following explanations or definitions of the terms used in the specification are given before the specific embodiments are described:

[0044] 1) Hydrogen internal combustion engine: refers to an internal combustion engine using hydrogen as fuel, which drives the reciprocating motion of the piston by burning the mixture of hydrogen and air, and the piston drives the connecting rod and the connecting rod drives the rotation of the crankshaft, thereby outputting rotary power. Unlike hydrogen fuel cell, hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy.

[0045] 2) Hydrogen internal combustion engine with external injection and hydrogen internal combustion engine with direct injection: the hydrogen nozzle of the hydrogen internal combustion engine with external injection is located outside the cylinder of the hydrogen internal combustion engine, usually in the intake manifold of the hydrogen internal combustion engine. The hydrogen internal combustion engine with direct injection, referred to as direct injection hydrogen internal combustion engine, has its hydrogen nozzle directly inserted into the cylinder of the hydrogen internal combustion engine.

[0046] 3) Supercharged hydrogen internal combustion engine: hydrogen internal combustion engine with air intake supercharging device, which is referred to as the supercharger here.

[0047] The present application will be described in detail below with reference to the accompanying drawings.

[0048] As Figure 2 A first embodiment of a method for determining whether backfire occurs in a hydrogen internal combustion engine with intake port direct injection is shown. The method comprises the following steps:

[0049] S201: Establishing a three-dimensional data model of the hydrogen internal combustion engine with intake port;

[0050] S202: Based on the three-dimensional data model of the hydrogen internal combustion engine with intake port, using computational fluid dynamics method to perform three-dimensional simulation calculation for at least two working cycles, obtaining the residual hydrogen mass in the intake port, the density of the mixture in the intake port, the volume occupied by the hydrogen diffusion range in the intake port, and the cylinder temperature at the time of the next cycle intake valve opening during the period from the previous cycle intake valve closing to the next cycle intake valve opening;

[0051] S203: According to the density of the mixture in the intake port and the volume occupied by the hydrogen diffusion range in the intake port, the mass of the mixture in the hydrogen diffusion range in the intake port is obtained, and according to the residual hydrogen mass in the intake port and the mass of the mixture in the hydrogen diffusion range in the intake port, the hydrogen mass fraction in the hydrogen diffusion range in the intake port is obtained.

[0052] wherein the residual hydrogen mass in the intake port and the mass of the mixture in the hydrogen diffusion range of the intake port are used to obtain the hydrogen mass fraction in the hydrogen diffusion range of the intake port, and the hydrogen mass fraction in the hydrogen diffusion range of the intake port is calculated according to the following formula:

[0053] m1 = p x V

[0054] wherein the m1 represents the mass of the mixture in the hydrogen diffusion range of the intake port, p represents the density of the mixture in the intake port, and V represents the volume occupied by the hydrogen diffusion range in the intake port.

[0055] wherein the residual hydrogen mass in the intake port and the mass of the mixture in the hydrogen diffusion range of the intake port are used to obtain the hydrogen mass fraction in the hydrogen diffusion range of the intake port, and the hydrogen mass fraction in the hydrogen diffusion range of the intake port is calculated according to the following formula:

[0056]

[0057] wherein the φ represents the hydrogen mass fraction in the hydrogen diffusion range of the intake port, the m1 represents the mass of the mixture in the hydrogen diffusion range of the intake port, and the m represents the residual hydrogen mass in the intake port.

[0058] S204: when the hydrogen mass fraction in the hydrogen diffusion range of the intake port is lower than a specified threshold value, it is determined that the intake port direct injection hydrogen internal combustion engine will not backfire.

[0059] wherein when the hydrogen mass fraction in the hydrogen diffusion range of the intake port is greater than or equal to a specified threshold value, and further when it is judged that the in-cylinder temperature is lower than the hydrogen-air mixture self-ignition temperature when the intake valve is opened in the next cycle, it is determined that the intake port direct injection hydrogen internal combustion engine will not backfire.

[0060] when the hydrogen mass fraction in the hydrogen diffusion range of the intake port is greater than or equal to a specified threshold value, and further when it is judged that the in-cylinder temperature is greater than or equal to the hydrogen-air mixture self-ignition temperature when the intake valve is opened in the next cycle, it is determined that the intake port direct injection hydrogen internal combustion engine will backfire.

[0061] In order to better understand the present application, further reference will be made to Figure 3 The flowchart shown introduces a second embodiment of a method for determining whether the intake port direct injection hydrogen internal combustion engine backfires according to the embodiments of the present application, which includes the following steps:

[0062] S301: establishing a three-dimensional data model of the intake port hydrogen internal combustion engine;

[0063] S302: Based on the three-dimensional data model of the intake port hydrogen internal combustion engine, at least two working cycle three-dimensional simulation calculations are performed using a computational fluid dynamics method to obtain the residual hydrogen mass in the intake port, the density of the mixture in the intake port, the volume occupied by the hydrogen diffusion range in the intake port, and the cylinder temperature at the next cycle intake valve opening;

[0064] S303: According to the density of the mixture in the intake port and the volume occupied by the hydrogen diffusion range in the intake port, the mass of the mixture in the hydrogen diffusion range in the intake port is obtained, and according to the residual hydrogen mass in the intake port and the mass of the mixture in the hydrogen diffusion range in the intake port, the hydrogen mass fraction in the hydrogen diffusion range in the intake port is obtained.

[0065] Wherein, according to the density of the mixture in the intake port and the volume occupied by the hydrogen diffusion range in the intake port, the mass of the mixture in the hydrogen diffusion range in the intake port is obtained, which is calculated according to the following formula:

[0066] m1 = p x V

[0067] Wherein, the m1 represents the mass of the mixture in the hydrogen diffusion range in the intake port, the p represents the density of the mixture in the intake port, and the V represents the volume occupied by the hydrogen diffusion range in the intake port.

[0068] Wherein, the residual hydrogen mass in the intake port and the mass of the mixture in the hydrogen diffusion range in the intake port are obtained, and the hydrogen mass fraction in the hydrogen diffusion range in the intake port is calculated according to the following formula:

[0069]

[0070] Wherein, the φ represents the hydrogen mass fraction in the hydrogen diffusion range in the intake port, the m1 represents the mass of the mixture in the hydrogen diffusion range in the intake port, and the m represents the residual hydrogen mass in the intake port.

[0071] S304: Determine whether the hydrogen mass fraction in the hydrogen diffusion range in the intake port is greater than or equal to a specified threshold value, and when it is determined that it is not, execute S305: determine that the intake port direct injection hydrogen internal combustion engine will not backfire, and execute S309: determine end.

[0072] When it is determined that it is, execute S306: determine whether the cylinder temperature at the next cycle intake valve opening is greater than or equal to the hydrogen-air mixture self-ignition temperature, and when it is determined that it is, execute S307: determine that the intake port direct injection hydrogen internal combustion engine will backfire, and execute S308: determine end. When it is determined that it is not, execute S305: determine that the intake port direct injection hydrogen internal combustion engine will not backfire, and execute S308: determine end.

[0073] As Figure 4 shown, the embodiments of the present application also provide a device for determining whether the hydrogen internal combustion engine with intake port direct injection occurs backfire, and the beneficial effects or technical problems solved by the device can be referred to the description in the method corresponding to the device respectively, or referred to the description in the summary, which is only briefly described here.

[0074] As Figure 4 shown, a device for determining whether the hydrogen internal combustion engine with intake port direct injection occurs backfire, comprising:

[0075] The construction module 401 is configured to establish a three-dimensional data model of the hydrogen internal combustion engine with intake port direct injection, and is specifically configured to implement the above step S201 and optional embodiments thereof.

[0076] The first calculation module 402 is configured to perform three-dimensional simulation calculation on at least two working cycles based on the three-dimensional data model of the hydrogen internal combustion engine with intake port direct injection using computational fluid dynamics method, and obtain the residual hydrogen mass in the intake port, the density of the mixture in the intake port, the volume occupied by the hydrogen diffusion range in the intake port, and the cylinder temperature at the intake valve opening of the next cycle during the period from the intake valve closing of the previous cycle to the intake valve opening of the next cycle. The first calculation module 402 is specifically configured to implement the above step S202 and optional embodiments thereof.

[0077] The second calculation module 403 is configured to obtain the mass of the mixture in the hydrogen diffusion range in the intake port according to the density of the mixture in the intake port and the volume occupied by the hydrogen diffusion range in the intake port. The second calculation module 403 is specifically configured to implement the above step S203 and optional embodiments thereof.

[0078] The third calculation module 404 is configured to obtain the hydrogen mass fraction in the hydrogen diffusion range in the intake port according to the residual hydrogen mass m in the intake port and the mass of the mixture in the hydrogen diffusion range in the intake port. The third calculation module 404 is specifically configured to implement the above step S203 and optional embodiments thereof.

[0079] The first determination module 405 is configured to determine that the hydrogen internal combustion engine with intake port direct injection will not occur backfire when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is lower than a specified threshold. The first determination module 405 is specifically configured to implement the above step S204 and optional embodiments thereof.

[0080] The second determination module 406 is configured to determine that the hydrogen internal combustion engine with intake port direct injection will not occur backfire when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is greater than or equal to the specified threshold, and further determine that the cylinder temperature at the intake valve opening of the next cycle is lower than the self-ignition temperature of hydrogen-air mixture. The second determination module 406 is specifically configured to implement the above step S204 and optional embodiments thereof.

[0081] The third determination module 407 is configured to determine that the hydrogen direct injection internal combustion engine is backfiring when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is greater than or equal to a specified threshold value, and further determining that the in-cylinder temperature is greater than or equal to the hydrogen-air mixture self-ignition temperature when the intake valve is opened in the next cycle. Specifically used to implement the above step S204 and its optional embodiments.

[0082] Figure 5 is a structural schematic diagram of a computing device 900 provided by an embodiment of the present application. As shown in the figure, the computing device 900 includes a processor 910, a memory 920, and a communication interface 930. Figure 5

[0083] It should be understood that Figure 5 The communication interface 930 in the computing device 900 shown can be used for communication between other devices, and can specifically include one or more transceiver circuits or interface circuits.

[0084] The processor 910 can be connected with the memory 920. The memory 920 can be used to store the program code and data. Therefore, the memory 920 can be a storage unit inside the processor 910, or an external storage unit independent of the processor 910, or a component including the storage unit inside the processor 910 and the external storage unit independent of the processor 910.

[0085] Optionally, the computing device 900 can further include a bus. The memory 920 and the communication interface 930 can be connected with the processor 910 through the bus. The bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 In the figure, a line without an arrow is used, but it does not mean that there is only one bus or only one type of bus.

[0086] ​It should be appreciated that in the embodiments of the present application, the processor 910 can be a central processing unit (CPU). The processor can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic components, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. Alternatively, the processor 910 can be one or more integrated circuits for performing related programs to implement the technical solutions provided by the embodiments of the present application.

[0087] The memory 920 can include read-only memory and random access memory, and provide instructions and data to the processor 910. Part of the processor 910 can also include non-volatile random access memory. For example, the processor 910 can also store device type information.

[0088] When the computing device 900 is running, the processor 910 executes computer execution instructions in the memory 920 to perform any operation step of the above method and any optional embodiment thereof.

[0089] It should be appreciated that the computing device 900 according to the embodiments of the present application can correspond to the execution of the corresponding subject in the method according to the embodiments of the present application, and the above and other operations and / or functions of each module in the computing device 900 are respectively for implementing the corresponding process of each method of the embodiments, and for brevity, will not be repeated here.

[0090] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solutions. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0091] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0092] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic. The division of the units is merely a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0093] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0094] In addition, each functional unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0095] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the essential part or part of the technical solutions that make contributions to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program codes that can be stored in the medium.

[0096] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program. The program is executed by a processor to perform the above method. The method includes at least one of the schemes described in the various embodiments.

[0097] The computer storage medium of the embodiments of the present application can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples (non-exhaustive list) of the computer-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus or device.

[0098] The computer-readable signal medium can include a data signal propagated in baseband or propagated as a carrier wave, in which computer-readable program code is embodied. Such propagated data signals can take a wide variety of forms, including but not limited to electro-magnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium that is not a storage medium, that is, that is not a tangible medium, and that can communicate, propagate or transport programming for use by or in connection with an instruction execution system, apparatus or device.

[0099] The program code embodied on the computer-readable media can be transmitted using any appropriate medium, including but not limited to wireless, wired, optical fiber cable, RF, etc., or any suitable combination of the above.

[0100] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider). In some embodiments, electronic circuitry including, for example, programmable logic circuitry, application specific circuitry, or field programmable gate array (FPGA) circuitry can execute the computer program code.

[0101] In addition, the words "first", "second", "third", etc., or "module A", "module B", "module C" and the like in the description and claims are used only to distinguish similar objects, and do not represent a specific order or sequence of the objects, and it is understood that the specific order or sequence can be interchanged, if permitted, so that the embodiments of the present application described herein can be implemented in other than the order or sequence described herein.

[0102] In the above description, the reference signs indicating the steps, such as S110, S120, etc., do not necessarily mean that the steps are executed in the order, and the order of the steps can be interchanged, or the steps can be executed simultaneously, if permitted.

[0103] The term "comprising" used in the description and claims should not be interpreted as limiting to the listed steps; it does not exclude other elements or steps. It means that the specifying features, integers, steps or components mentioned are included, but other features, integers, steps or components are not excluded or added. Therefore, the expression "a device comprising means A and B" should not be limited to a device consisting only of the means A and B.

[0104] The phrase "one embodiment" or "an embodiment" appearing in the present specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, the appearances of the phrase "in one embodiment" or "in an embodiment" throughout the present specification are not necessarily all referring to the same embodiment, but can refer to different embodiments. Furthermore, the various specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments, as would be apparent to one of ordinary skill in the art upon reviewing the present disclosure.

[0105] Note that the above only describes the preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and all fall within the scope of the present application.

Claims

1. A method for determining whether backfiring occurs in a hydrogen direct injection internal combustion engine of a ported intake type, characterized by, The method comprises: establishing a three-dimensional data model of the intake port hydrogen internal combustion engine; based on the three-dimensional data model of the intake port hydrogen internal combustion engine, using computational fluid dynamics method to perform three-dimensional simulation calculation of at least two working cycles, obtaining the residual hydrogen mass in the intake port from the intake valve closing of the previous cycle to the intake valve opening of the next cycle, the density of the mixture in the intake port, the volume occupied by the hydrogen diffusion range in the intake port, and the cylinder temperature at the intake valve opening of the next cycle; obtaining the mass of the mixture in the hydrogen diffusion range in the intake port according to the density of the mixture in the intake port and the volume occupied by the hydrogen diffusion range in the intake port, and obtaining the hydrogen mass fraction in the hydrogen diffusion range in the intake port according to the residual hydrogen mass in the intake port and the mass of the mixture in the hydrogen diffusion range in the intake port according to the following formula: ； wherein the wherein the m1 represents the mass of the mixture in the hydrogen diffusion range in the intake passage, and the m represents the mass of the residual hydrogen in the intake passage. when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is lower than a specified threshold value, it is determined that the intake port direct injection hydrogen internal combustion engine will not backfire.

2. The method for determining whether backfire occurs in a hydrogen direct injection internal combustion engine having a port, according to claim 1, characterized by, The method further comprises: when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is greater than or equal to the specified threshold value, and further determining that the cylinder temperature at the intake valve opening of the next cycle is lower than the self-ignition temperature of hydrogen-air mixture, it is determined that the intake port direct injection hydrogen internal combustion engine will not backfire.

3. The method for determining whether backfire occurs in a direct injection hydrogen internal combustion engine having an intake port according to claim 1, characterized by, The method further comprises: when the hydrogen mass fraction in the hydrogen diffusion range in the intake port is greater than or equal to the specified threshold value, and further determining that the cylinder temperature at the intake valve opening of the next cycle is greater than or equal to the self-ignition temperature of hydrogen-air mixture, it is determined that the intake port direct injection hydrogen internal combustion engine will backfire.

4. The method for determining whether backfire occurs in a direct injection hydrogen internal combustion engine having an intake port according to claim 1, characterized by, The method further comprises: ； wherein the represents the mass of the mixture in the hydrogen diffusion range in the intake passage, represents the density of the mixture in the intake passage, and V represents the volume occupied by the hydrogen diffusion range in the intake passage.

5. A device for determining whether backfire has occurred in a manifold direct injection hydrogen internal combustion engine, characterized in that, The method further comprises: The method further comprises: The method further comprises: The method further comprises: The method further comprises: ； wherein the wherein the m1 represents the mass of the mixture in the hydrogen diffusion range in the intake passage, and the m represents the residual hydrogen mass in the intake passage. The method further comprises:

6. The apparatus for determining whether backfire occurs in a direct injection hydrogen internal combustion engine according to claim 5, characterized by The method further comprises: The method further comprises:

7. 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threshold value, and further judging that the in-cylinder temperature is greater than or equal to the hydrogen-air mixture self-ignition temperature when the intake valve is opened in the next cycle.

8. A computing device, comprising: It comprises a memory and a processor, wherein: The memory has stored program instructions, which, when executed by the processor, cause the processor to execute the method for judging whether backfiring of the hydrogen direct-injection internal combustion engine occurs according to any one of claims 1-4.

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