Marine ammonia fuel engine injection control method and system, terminal and medium

Abstract

The invention provides a marine ammonia fuel engine injection control method and system, a terminal and a medium, firstly, engine working condition parameters are collected, a pre-calibrated total energy demand MAP is inquired according to the engine working condition parameters, and total energy needed by the current working condition is obtained; meanwhile, the ammonia substitution rate MAP is inquired to obtain a basic ammonia substitution rate, and the final ammonia substitution rate is obtained after correction. Energy needing to be provided by the ammonia fuel is calculated through the total energy and the ammonia substitution rate, and the injection amount of the ammonia fuel is determined in combination with the injection system efficiency and the dynamic response characteristic. And then an injection instruction is generated and sent to an injection system, and ammonia fuel injection according to the given timing, pressure and pulse width is achieved. And based on the combustion state, the emission parameters and the working condition parameters which are monitored in real time, the injection amount is fed back and corrected. The ammonia fuel injection amount is determined according to the engine working condition, the combustion efficiency and stability are improved, and emission is reduced. By considering the characteristics of the injection system and combining with secondary feedback correction of real-time monitoring parameters, the defects of empirical formula or simple proportion control adopted in the prior art are overcome, the control problem of the large-cylinder-diameter engine is solved, the strategy can be adjusted in time, faults are avoided, and the operation durability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engines, and in particular to a method, system, terminal and medium for controlling injection of a marine ammonia fuel engine. Background Art

[0002] Traditional marine engines primarily rely on fossil fuels such as diesel, which emit nitrogen oxides, sulfur compounds, and carbon dioxide, causing serious environmental pollution. With increasingly stringent environmental regulations, the search for clean alternative fuels has become a key direction for the development of marine engines. Ammonia, a zero-carbon fuel with a high hydrogen content, produces only nitrogen and water upon combustion, making it an ideal alternative fuel for marine engines.

[0003] However, the combustion characteristics of ammonia fuel differ significantly from those of traditional fuels, such as high ignition energy and slow flame propagation speed. This makes it difficult to ensure combustion stability and efficiency in ammonia-fueled engines under different operating conditions. Furthermore, ammonia is toxic, and excessive injection can lead to ammonia leakage, posing a safety hazard. Therefore, precisely controlling the injection rate of ammonia fuel has become a key technical challenge in the application of ammonia-fueled engines.

[0004] Currently, existing injection control methods for ammonia-fueled engines are primarily based on empirical formulas or simple proportional control. These methods are unable to precisely adjust the ammonia fuel injection rate based on the engine's real-time operating conditions, leading to unstable engine performance and substandard emissions. This is particularly true for large-bore marine engines, where the combustion process is more complex and requires higher precision in injection control. Existing technologies struggle to meet these demands. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method, system, terminal and medium for controlling the injection of ammonia-fueled marine engines, which are used to solve the technical problems of the existing ammonia-fuel injection control technology, which relies on empirical formulas or simple proportional control and cannot adapt to complex working conditions in real time, resulting in performance fluctuations and excessive emissions of large-cylinder marine engines.

[0006] To achieve the above-mentioned object and other related objects, the present invention provides a method for controlling injection of a marine ammonia fuel engine, the method comprising: collecting operating parameters of the marine ammonia fuel engine; based on the operating parameters, querying a pre-calibrated total energy demand MAP diagram to obtain the total energy required by the marine ammonia fuel engine under the current operating conditions; based on the operating parameters, querying a pre-calibrated ammonia substitution rate MAP diagram to obtain a basic ammonia substitution rate and correcting the basic ammonia substitution rate to obtain a final ammonia substitution rate; calculating the energy required to be provided by the ammonia fuel based on the total energy and the ammonia substitution rate, and obtaining the ammonia fuel injection amount in combination with the efficiency and dynamic response characteristics of the injection system; generating a corresponding ammonia fuel injection instruction based on the ammonia fuel injection amount, and sending it to the ammonia fuel injection system to inject the ammonia fuel according to a given timing, pressure and pulse width; and feedback-correcting the ammonia fuel injection amount based on the combustion state, emission parameters and operating parameters of the marine ammonia fuel engine monitored in real time.

[0007] In one embodiment of the present invention, the operating parameters of the marine ammonia fuel engine include: engine speed, load, intake air temperature, intake air pressure and cooling water temperature.

[0008] In one embodiment of the present invention, the querying of a pre-calibrated total energy demand MAP diagram based on the operating condition parameters to obtain the total energy required by the marine ammonia fuel engine under the current operating conditions includes: querying a pre-calibrated total energy demand MAP diagram to obtain the total energy required by the marine ammonia fuel engine under the current operating conditions according to the engine speed and load; wherein the total energy demand MAP diagram is calibrated through bench testing and includes: the total energy of the engine at different speeds and loads.

[0009] In one embodiment of the present invention, based on the operating condition parameters, querying a pre-calibrated ammonia substitution rate MAP map to obtain a basic ammonia substitution rate and correcting the basic ammonia substitution rate to obtain a final ammonia substitution rate includes: according to the engine speed and load, querying a pre-calibrated ammonia substitution rate MAP map to obtain a basic ammonia substitution rate corresponding to the current engine speed and load; wherein the ammonia substitution rate MAP map includes: an ammonia substitution rate that can achieve an optimal balance between engine performance and emissions under different speeds and loads; and correcting the basic ammonia substitution rate to obtain a final ammonia substitution rate.

[0010] In one embodiment of the present invention, the correction of the basic ammonia substitution rate to obtain the final ammonia substitution rate includes: according to the intake air temperature, intake air pressure and cooling water temperature, querying the air temperature correction coefficient, intake air pressure correction coefficient and cooling water temperature correction coefficient determined by the experiment, correcting the basic ammonia substitution rate to obtain the final ammonia substitution rate.

[0011] In one embodiment of the present invention, the energy required to be provided by the ammonia fuel is calculated based on the total energy and the ammonia substitution rate, and the ammonia fuel injection amount is obtained in combination with the efficiency and dynamic response characteristics of the injection system, including: calculating the energy required to be provided by the ammonia fuel based on the total energy and the ammonia substitution rate, and calculating the mass injection amount of the ammonia fuel based on the lower calorific value of the ammonia fuel; correcting the mass injection amount of the ammonia fuel based on the efficiency and dynamic response characteristics of the injection system to obtain the ammonia fuel injection amount.

[0012] In one embodiment of the present invention, the generation of a corresponding ammonia fuel injection instruction based on the ammonia fuel injection amount and sending it to the ammonia fuel injection system to inject the ammonia fuel at a given timing, pressure and pulse width includes: generating an ammonia fuel injection instruction including injection timing, target injection pressure and injection pulse width based on the ammonia fuel injection amount; sending the ammonia fuel injection instruction to the ammonia fuel injection system to control the injection of ammonia fuel at the corresponding injection timing, target injection pressure and injection pulse width.

[0013] To achieve the above-mentioned purpose and other related purposes, the present invention provides a marine ammonia fuel engine injection control system, the system comprising: a data acquisition module for collecting operating parameters of the marine ammonia fuel engine; a total energy demand acquisition module, connected to the data acquisition module, for querying a pre-calibrated total energy demand MAP diagram based on the operating parameters to obtain the total energy required by the marine ammonia fuel engine under the current operating conditions; an ammonia substitution rate acquisition module, connected to the data acquisition module, for querying a pre-calibrated ammonia substitution rate MAP diagram based on the operating parameters to obtain a basic ammonia substitution rate and correcting the basic ammonia substitution rate to obtain a final ammonia substitution rate; an ammonia fuel injection amount calculation module , connected to the total energy demand acquisition module and the ammonia substitution rate acquisition module, for calculating the energy required to be provided by the ammonia fuel based on the total energy and the ammonia substitution rate, and obtaining the ammonia fuel injection amount in combination with the efficiency and dynamic response characteristics of the injection system; an injection control module, connected to the ammonia fuel injection amount calculation module, for generating a corresponding ammonia fuel injection instruction based on the ammonia fuel injection amount, and sending it to the ammonia fuel injection system to inject the ammonia fuel according to a given timing, pressure and pulse width; a feedback correction module, connected to the ammonia fuel injection amount module and the injection control module, for performing feedback correction on the ammonia fuel injection amount based on the combustion state, emission parameters and operating parameters of the ammonia fuel engine monitored in real time.

[0014] To achieve the above-mentioned objectives and other related objectives, the present invention provides an electronic terminal comprising: one or more memories and one or more processors; the one or more memories are used to store computer programs; the one or more processors are connected to the memories and are used to run the computer programs to execute the marine ammonia fuel engine injection control method.

[0015] To achieve the above-mentioned and other related objectives, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by one or more processors, executes the marine ammonia fuel engine injection control method.

[0016] As described above, the present invention provides a method, system, terminal, and medium for controlling the injection of a marine ammonia-fueled engine, which has the following beneficial effects: The present invention first collects engine operating parameters and, based on these parameters, queries a pre-calibrated total energy demand map to obtain the total energy required for the current operating conditions. Simultaneously, the ammonia substitution rate map is queried to obtain a basic ammonia substitution rate, which is then corrected to obtain the final ammonia substitution rate. The energy required to be provided by the ammonia fuel is calculated using the total energy and the ammonia substitution rate. The amount of ammonia fuel injected is then determined based on the injection system's efficiency and dynamic response characteristics. An injection command is then generated and sent to the injection system to achieve ammonia fuel injection at a given timing, pressure, and pulse width. Based on this, feedback corrections are performed on the injection amount based on real-time monitored combustion conditions, emission parameters, and operating condition parameters. This method can accurately determine the amount of ammonia fuel injected based on the ammonia substitution rate and total energy demand of the engine's current operating conditions, thereby improving combustion efficiency and stability and reducing pollutant emissions. By performing secondary corrections based on injection system characteristics and feedback corrections based on real-time monitored parameters, this method overcomes the shortcomings of existing technologies that employ empirical formulas or simple proportional control, addressing the complex combustion and high control precision requirements of large-cylinder engines. In addition, real-time feedback correction can promptly detect combustion anomalies and adjust the injection strategy, avoiding engine failures caused by operating condition fluctuations and improving operating durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a flow chart of a method for controlling injection of a marine ammonia fuel engine according to an embodiment of the present invention.

[0018] Figure 2 Shown is a schematic structural diagram of a marine ammonia fuel engine injection control system according to one embodiment of the present invention.

[0019] Figure 3 Shown is a schematic structural diagram of an electronic terminal in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0021] It should be noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the present invention. It should be understood that other embodiments may be used and that mechanical, structural, electrical and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present invention is limited only by the claims of the published patents. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between one element or feature shown in the figure and another element or feature.

[0022] Throughout this specification, when a part is said to be "connected" to another part, this includes not only "direct connection" but also "indirect connection" with other elements interposed therebetween. Furthermore, when a part is said to "include" a certain component, unless otherwise stated, this does not exclude the other component but rather implies that the other component may be included.

[0023] The terms "first," "second," and "third" are used to describe various parts, components, regions, layers, and / or segments, but are not intended to be limiting. These terms are used solely to distinguish one part, component, region, layer, or segment from another. Therefore, a reference to a first part, component, region, layer, or segment below may also refer to a second part, component, region, layer, or segment without departing from the scope of the present invention.

[0024] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0025] The present invention provides a method for controlling the injection of a marine ammonia fuel engine. First, the engine operating parameters are collected, and a pre-calibrated total energy demand MAP diagram is queried based on the collected parameters to obtain the total energy required for the current operating conditions. At the same time, the ammonia substitution rate MAP diagram is queried to obtain the basic ammonia substitution rate, and the final ammonia substitution rate is obtained after correction. The energy required to be provided by the ammonia fuel is calculated by combining the total energy and the ammonia substitution rate, and then the ammonia fuel injection amount is determined in combination with the injection system efficiency and dynamic response characteristics. An injection instruction is then generated and sent to the injection system to achieve ammonia fuel injection according to a given timing, pressure and pulse width. On this basis, the injection amount is feedback-corrected based on the combustion state, emission parameters and operating condition parameters monitored in real time. This method can accurately determine the ammonia fuel injection amount based on the ammonia substitution rate and total energy demand of the current engine operating conditions, improve combustion efficiency and stability, and reduce pollutant emissions. By performing secondary corrections based on the characteristics of the injection system and combining feedback corrections with real-time monitoring parameters, the shortcomings of the existing technology using empirical formulas or simple proportional control are compensated, and the problems of complex combustion and high control accuracy requirements of large-cylinder engines are solved. In addition, real-time feedback correction can promptly detect combustion anomalies and adjust the injection strategy, avoiding engine failures caused by operating condition fluctuations and improving operating durability.

[0026] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be embodied in many different forms and is not limited to the embodiments described herein.

[0027] like Figure 1 A schematic structural diagram showing a method for controlling injection of a marine ammonia fuel engine according to an embodiment of the present invention is shown.

[0028] The method comprises:

[0029] Step S1: collecting operating parameters of a marine ammonia fuel engine.

[0030] In one embodiment, operating parameters of a marine ammonia fuel engine are collected by sensors, where the operating parameters of the marine ammonia fuel engine include engine speed, load, intake air temperature, intake air pressure, cooling water temperature, etc.

[0031] For example, the engine crankshaft speed can be accurately measured through a magnetoelectric speed sensor or a Hall-type speed sensor, which is a key parameter for calculating the total energy demand and injection timing; the current engine workload can be quantified through a torque sensor or an throttle position sensor, reflecting the power demand of the ship's propulsion system; the state of the air entering the cylinder can be monitored through a thermistor temperature sensor, which is used to correct the combustion model and injection quantity calculation; and the thermal resistance sensor can be used to reflect the thermal state of the engine and collect the cooling water temperature.

[0032] Step S2: Based on the operating condition parameters, a pre-calibrated total energy demand MAP is queried to obtain the total energy required by the marine ammonia fuel engine under the current operating condition.

[0033] In one embodiment, during bench testing, the engine is fully tested under various speed and load combinations to generate a total energy demand map. This map contains information about the total energy demand of the engine at various speeds and loads. Because it reflects the total energy demand of the engine at various speeds and loads, it provides a reliable basis for accurately determining the total energy demand of a marine ammonia-fueled engine under current operating conditions.

[0034] Therefore, step S2 includes: according to the engine speed and load, querying a pre-calibrated total energy demand MAP diagram to obtain the total energy required by the marine ammonia fuel engine under the current working conditions.

[0035] Step S3: Based on the operating condition parameters, query a pre-calibrated ammonia substitution rate MAP to obtain a basic ammonia substitution rate and correct the basic ammonia substitution rate to obtain a final ammonia substitution rate.

[0036] In one embodiment, during the test, researchers will systematically change the engine speed and load, adjust the ammonia substitution rate, and monitor the engine's performance indicators (such as power, torque, fuel consumption rate, etc.) and emission indicators (such as nitrogen oxides, particulate matter, etc.) in real time to obtain an ammonia substitution rate MAP diagram. The MAP diagram contains the ammonia substitution rate that can achieve the best balance between engine performance and emissions at different speeds and loads. The ammonia substitution rate MAP diagram provides a direct basis for determining the basic ammonia substitution rate. It is based on a large amount of test data and reflects the trend of the optimal ammonia substitution rate of the engine under different operating conditions. By querying this diagram, the basic ammonia substitution rate corresponding to the current operating conditions can be quickly obtained, which lays the foundation for subsequent corrections and the determination of the final ammonia substitution rate, and helps to improve the engine's operating efficiency and environmental performance.

[0037] Step S3 includes:

[0038] Based on the current engine speed and load, two key parameters, a pre-calibrated ammonia substitution rate map is searched. The point in the map that corresponds to the current engine speed and load is found. The value corresponding to this point is the basic ammonia substitution rate.

[0039] After obtaining the basic ammonia substitution rate, these influencing factors are quantified and incorporated into the calculation by establishing a corresponding correction model or algorithm to adjust the basic ammonia substitution rate.

[0040] In one embodiment, the engine's operating state and the combustion process of the ammonia fuel are significantly affected by environmental conditions. Intake air temperature, intake air pressure, and cooling water temperature are key parameters reflecting the engine's operating environment. Changes in these parameters can alter the combustion environment within the engine cylinder, thereby affecting the combustion efficiency and stability of the ammonia fuel. Therefore, a corresponding correction factor is required to modify the basic ammonia substitution rate to compensate for the adverse effects of these environmental changes on ammonia fuel combustion, ensuring stable and efficient engine operation under different operating conditions and achieving good emissions performance.

[0041] Experimentally determined correction factors for air temperature, intake pressure, and cooling water temperature are pre-stored. These factors correspond to different intake air temperature, intake pressure, and cooling water temperature ranges, forming a correction factor table. Based on the real-time collected intake air temperature, intake pressure, and cooling water temperature, the corresponding correction factor is searched in the correction factor table. After obtaining the correction factors for each parameter, the basic ammonia substitution rate is calculated and corrected according to a preset correction algorithm to obtain the final ammonia substitution rate.

[0042] Step S4: Calculate the energy required to be provided by the ammonia fuel according to the total energy and the ammonia replacement rate, and obtain the ammonia fuel injection amount in combination with the efficiency and dynamic response characteristics of the injection system.

[0043] In one embodiment, step S4 includes:

[0044] Calculating the energy required to be provided by the ammonia fuel according to the total energy and the ammonia replacement rate and calculating the mass injection amount of the ammonia fuel according to the lower calorific value of the ammonia fuel;

[0045] Consider two key factors: injection system efficiency and dynamic response characteristics. Injection system efficiency reflects the proportion of fuel actually injected by the injection system that effectively participates in combustion. Due to potential issues such as fuel leakage and incomplete atomization during the injection process, the actual amount of fuel effectively injected may be less than the theoretically calculated value, so corrections need to be made based on efficiency.

[0046] The dynamic response of an injection system refers to its speed and accuracy in responding to control signals. In actual operation, engine operating conditions are constantly changing, and the injection system may not be able to instantly reach the theoretical injection rate. Therefore, the mass injection rate needs to be adjusted based on its dynamic response characteristics.

[0047] By establishing a corresponding correction model or algorithm, the parameters related to the injection system efficiency and dynamic response characteristics are included in the calculation, and the ammonia fuel mass injection amount calculated previously is corrected to finally obtain the ammonia fuel injection amount.

[0048] Step S5: Generate a corresponding ammonia fuel injection instruction based on the ammonia fuel injection amount and send it to the ammonia fuel injection system to inject the ammonia fuel at a given timing, pressure and pulse width.

[0049] In one embodiment, step S5 includes:

[0050] An ammonia fuel injection instruction including injection timing, target injection pressure and injection pulse width is generated based on the ammonia fuel injection amount; specifically, injection timing refers to the moment when the ammonia fuel injection begins, which has an important impact on the combustion process and performance of the engine. When generating instructions, it is necessary to determine the optimal injection timing based on the ammonia fuel injection amount and in combination with the engine speed, load and current operating conditions. The target injection pressure determines the injection speed and atomization effect of the ammonia fuel. The appropriate injection pressure can better atomize the ammonia fuel and fully mix it with the air, thereby improving combustion efficiency. When setting the target injection pressure, the ammonia fuel injection amount and factors such as the engine's compression ratio, combustion chamber structure and the physical properties of the ammonia fuel need to be considered. The injection pulse width refers to the duration of the ammonia fuel injection, which is directly related to the ammonia fuel injection amount. Based on the obtained ammonia fuel injection amount and combined with the flow characteristics of the injection system, the required injection pulse width can be calculated.

[0051] The ammonia fuel injection instruction is sent to the ammonia fuel injection system to control the injection of ammonia fuel according to the corresponding injection timing, target injection pressure and injection pulse width. The ammonia fuel injection system can use dual methanol injectors.

[0052] Step S6: performing feedback correction on the ammonia fuel injection amount based on the real-time monitored combustion state, emission parameters and operating condition parameters of the marine ammonia fuel engine.

[0053] In one embodiment, the operating conditions of a marine ammonia-fueled engine are complex and changeable, and are affected by various factors such as the marine environment and the ship's navigation status. Moreover, the characteristics of ammonia fuel are different from those of traditional fuels, and its combustion process and emission characteristics are more complex. Relying solely on the initially set ammonia substitution rate and ammonia fuel injection amount, it is difficult to ensure that the engine can operate stably and efficiently under various operating conditions. By real-time monitoring of the engine's key parameters and performing feedback corrections, the ammonia fuel injection amount can be adjusted in a timely manner to keep the engine in the optimal operating state at all times, thereby improving its reliability, economy, and environmental performance.

[0054] Real-time monitoring of the engine's combustion state, emission parameters, and operating parameters, such as in-cylinder pressure, exhaust temperature, and NOx emissions. Based on the engine's physical model and a large amount of test data, a feedback control model is established between the ammonia fuel injection amount and the combustion state, emission parameters, and operating parameters. This model can be a complex mathematical model or a model based on intelligent algorithms such as neural networks. The adjusted ammonia fuel injection amount is obtained by inputting the monitored engine's combustion state, emission parameters, operating parameters, and ammonia fuel injection amount into the feedback control model. The adjustment process can be continuous fine-tuning or a larger adjustment in stages, depending on the degree of parameter change and the engine's operating state. Feedback corrections are made to the ammonia replacement rate and ammonia fuel injection amount based on the monitoring results to ensure stable and efficient operation of the engine under various operating conditions.

[0055] Similar in principle to the above embodiment, the present invention provides a marine ammonia fuel engine injection control system.

[0056] The following provides specific embodiments in conjunction with the accompanying drawings:

[0057] like Figure 2 The following is a schematic diagram showing the structure of a marine ammonia fuel engine injection control system according to an embodiment of the present invention. The structure includes:

[0058] Data acquisition module 1, used to collect operating parameters of marine ammonia fuel engines;

[0059] A total energy demand acquisition module 2 is connected to the data acquisition module 1 and is used to query a pre-calibrated total energy demand MAP diagram based on the operating condition parameters to obtain the total energy required by the marine ammonia fuel engine under the current operating condition;

[0060] an ammonia substitution rate acquisition module 3 connected to the data acquisition module 1 and configured to query a pre-calibrated ammonia substitution rate MAP based on the operating condition parameters to obtain a basic ammonia substitution rate and to correct the basic ammonia substitution rate to obtain a final ammonia substitution rate;

[0061] an ammonia fuel injection amount calculation module 4, connected to the total energy demand acquisition module 2 and the ammonia substitution rate acquisition module 3, for calculating the energy required to be provided by the ammonia fuel based on the total energy and the ammonia substitution rate, and obtaining the ammonia fuel injection amount in combination with the efficiency and dynamic response characteristics of the injection system;

[0062] an injection control module 5 connected to the ammonia fuel injection amount calculation module 4, configured to generate a corresponding ammonia fuel injection instruction based on the ammonia fuel injection amount and send the instruction to the ammonia fuel injection system to inject the ammonia fuel at a given timing, pressure and pulse width;

[0063] The feedback correction module 6 is connected to the ammonia fuel injection quantity module 4 and the injection control module 5, and is used to perform feedback correction on the ammonia fuel injection quantity based on the combustion state, emission parameters and operating parameters of the ammonia fuel engine monitored in real time.

[0064] Since the implementation principle of the marine ammonia fuel engine injection control system has been described in the above embodiments, it will not be repeated here.

[0065] The marine ammonia fuel engine injection control method provided by the embodiment of the present invention can be implemented on the terminal side or the server side. As for the hardware structure of the electronic terminal, please refer to Figure 3 , is an optional hardware structure diagram of the electronic terminal 1000 provided in an embodiment of the present invention. The terminal 1000 can be a mobile phone, a computer device, a tablet device, a personal digital processing device, a factory background processing device, etc. The terminal 1000 includes: at least one processor 1001, a memory 1002, at least one network interface 10010 and a user interface 1009. The various components in the device are coupled together through a bus system 1005. It can be understood that the bus system 1005 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 1005 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, Figure 3 Various buses are labeled as bus systems.

[0066] The user interface 1009 may include a display, a keyboard, a mouse, a trackball, a click gun, keys, buttons, a touch pad or a touch screen.

[0067] It will be appreciated that the memory 1002 may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM) or a programmable read-only memory (PROM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM) and synchronous static random access memory (SSRAM). The memory described in the embodiments of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

[0068] The memory 1002 in the embodiment of the present invention is used to store various categories of data to support the operation of the terminal 1000. Examples of these data include: any executable program for operating on the terminal 1000, such as an operating system 10021 and an application 10022; the operating system 10021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application 10022 can include various applications, such as a media player (MediaPlayer), a browser (Browser), etc., for implementing various application services. The marine ammonia fuel engine injection control method provided in the embodiment of the present invention can be included in the application 10022.

[0069] The methods disclosed in the above embodiments of the present invention can be applied to or implemented by processor 1001. Processor 1001 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in processor 1001 or by software instructions. The above processor 1001 may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 1001 can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor 1001 may be a microprocessor or any conventional processor. The steps of the accessory optimization method provided in the embodiments of the present invention can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium located in a memory. The processor reads the information in the memory and, in conjunction with its hardware, completes the steps of the above method.

[0070] In an exemplary embodiment, the terminal 1000 may be used by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), and complex programmable logic devices (CPLDs) to execute the aforementioned method.

[0071] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with a computer program. The aforementioned computer program can be stored in a computer-readable storage medium. When executed, the program performs the steps in the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0072] In the embodiments provided herein, the computer readable and writable storage medium may include a read-only memory, a random access memory, an EEPROM, a CD-ROM or other optical disk storage device, a magnetic disk storage device or other magnetic storage device, a flash memory, a USB flash drive, a mobile hard disk, or any other medium that can be used to store desired program code in the form of instructions or data structures and can be accessed by a computer. In addition, any connection can be appropriately referred to as a computer readable medium. For example, if the instruction is sent from a website, a server or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves, the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves are included in the definition of the medium. However, it should be understood that computer readable and writable storage media and data storage media do not include connections, carriers, signals or other temporary media, but are intended to be non-temporary, tangible storage media. Disk and disc, as used in this application, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.

[0073] Compared with existing technologies, it has the following advantages:

[0074] 1. This invention collects operating parameters such as engine speed, load, intake air temperature, intake air pressure, and cooling water temperature. It first determines the total energy requirement based on speed and load, then calculates the actual injection rate using a base ammonia replacement rate combined with correction factors such as temperature and pressure, ensuring a precise match between the injection rate and the operating conditions. A secondary correction is made to the injection rate, taking into account the efficiency and dynamic response characteristics of the injection system. Feedback correction is also provided through real-time monitoring of parameters such as in-cylinder pressure and exhaust temperature. This overcomes the shortcomings of existing technologies based on empirical formulas or simple proportional control, addressing the complex combustion and high control precision requirements of large-bore engines.

[0075] 2. The ammonia-fueled engine of this invention produces only nitrogen and water when it burns ammonia fuel, eliminating carbon dioxide emissions from the fuel itself. Furthermore, by precisely controlling the injection rate, it avoids leakage caused by excessive ammonia injection and reduces pollutants such as NOx produced by incomplete combustion. Compared to traditional diesel engines, it significantly reduces sulfur compound and particulate matter emissions, meeting stringent environmental regulations.

[0076] 3. By monitoring parameters such as in-cylinder pressure and exhaust temperature, the system can promptly detect combustion anomalies (such as detonation and misfire) and adjust the injection strategy through feedback correction, thereby avoiding engine failures caused by fluctuating operating conditions and improving operating durability. When abnormal in-cylinder pressure is detected, the ammonia injection amount can be immediately reduced and the injection timing adjusted to prevent component damage.

[0077] In summary, the marine ammonia fuel engine injection control method, system, terminal and medium of the present invention first collect engine operating parameters, and query the pre-calibrated total energy demand MAP diagram based on this to obtain the total energy required for the current operating conditions. At the same time, the ammonia substitution rate MAP diagram is queried to obtain the basic ammonia substitution rate, and the final ammonia substitution rate is obtained after correction. The energy required to be provided by the ammonia fuel is calculated by the total energy and the ammonia substitution rate, and then the ammonia fuel injection amount is determined in combination with the injection system efficiency and dynamic response characteristics. An injection instruction is then generated and sent to the injection system to achieve ammonia fuel injection according to a given timing, pressure and pulse width. On this basis, the injection amount is feedback-corrected based on the combustion state, emission parameters and operating condition parameters monitored in real time. This method can accurately determine the ammonia fuel injection amount according to the ammonia substitution rate and total energy demand of the current operating condition of the engine, improve combustion efficiency and stability, and reduce pollutant emissions. By taking into account the characteristics of the injection system for secondary correction, and combining the feedback correction of real-time monitoring parameters, the shortcomings of the existing technology using empirical formulas or simple proportional control are compensated, and the problems of complex combustion and high control accuracy requirements of large-cylinder engines are solved. Furthermore, real-time feedback correction can promptly detect combustion anomalies and adjust the injection strategy, avoiding engine failures caused by operating condition fluctuations and improving operational durability. Therefore, this invention effectively overcomes the shortcomings of existing technologies and has high industrial application value.

[0078] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, any equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A method for controlling injection of a marine ammonia fuel engine, characterized in that: The method comprises: Collect operating parameters of marine ammonia fuel engines; Based on the operating condition parameters, query a pre-calibrated total energy demand MAP to obtain the total energy required by the marine ammonia fuel engine under the current operating condition; Based on the operating condition parameters, query a pre-calibrated ammonia substitution rate MAP to obtain a basic ammonia substitution rate and correct the basic ammonia substitution rate to obtain a final ammonia substitution rate; Calculating the energy required to be provided by the ammonia fuel based on the total energy and the ammonia substitution rate, and obtaining the ammonia fuel injection amount in combination with the efficiency and dynamic response characteristics of the injection system; generating a corresponding ammonia fuel injection command based on the ammonia fuel injection amount and sending the command to the ammonia fuel injection system to inject the ammonia fuel at a given timing, pressure, and pulse width; Feedback correction is performed on the ammonia fuel injection amount based on the combustion state, emission parameters and operating condition parameters of the marine ammonia fuel engine monitored in real time.

2. The method for controlling injection of ammonia fueled marine engines according to claim 1, wherein: The operating parameters of the marine ammonia fuel engine include: engine speed, load, intake air temperature, intake air pressure and cooling water temperature.

3. The method for controlling injection of ammonia fueled marine engines according to claim 2, wherein: The querying of a pre-calibrated total energy demand MAP based on the operating condition parameters to obtain the total energy required by the marine ammonia fuel engine under the current operating condition includes: According to the engine speed and load, the total energy required by the marine ammonia fuel engine under the current operating conditions is obtained by querying the pre-calibrated total energy demand MAP diagram; wherein, the total energy demand MAP diagram is calibrated through bench testing and includes: the total energy of the engine at different speeds and loads.

4. The method for controlling injection of ammonia fueled marine engines according to claim 2, wherein: The step of querying a pre-calibrated ammonia substitution rate MAP based on the operating condition parameters to obtain a basic ammonia substitution rate and correcting the basic ammonia substitution rate to obtain a final ammonia substitution rate includes: According to the engine speed and load, a pre-calibrated ammonia substitution rate map is searched to obtain a basic ammonia substitution rate corresponding to the current engine speed and load; wherein the ammonia substitution rate map includes: an ammonia substitution rate that can achieve an optimal balance between engine performance and emissions at different speeds and loads; The basic ammonia substitution rate is corrected to obtain the final ammonia substitution rate.

5. The method for controlling injection of ammonia fueled marine engines according to claim 4, wherein: The correction of the basic ammonia substitution rate to obtain the final ammonia substitution rate includes: According to the intake air temperature, intake air pressure and cooling water temperature, the air temperature correction coefficient, intake air pressure correction coefficient and cooling water temperature correction coefficient determined by the test are queried to correct the basic ammonia substitution rate and obtain the final ammonia substitution rate.

6. The method for controlling injection of ammonia fueled marine engines according to claim 1, wherein: Calculating the energy required to be provided by the ammonia fuel according to the total energy and the ammonia substitution rate, and obtaining the ammonia fuel injection amount in combination with the efficiency and dynamic response characteristics of the injection system includes: Calculating the energy required to be provided by the ammonia fuel based on the total energy and the ammonia replacement rate, and calculating the mass injection amount of the ammonia fuel based on the lower calorific value of the ammonia fuel; According to the efficiency and dynamic response characteristics of the injection system, the mass injection amount of the ammonia fuel is corrected to obtain the ammonia fuel injection amount.

7. The method for controlling injection of ammonia fueled marine engines according to claim 1, wherein: The generating of a corresponding ammonia fuel injection instruction based on the ammonia fuel injection amount and sending the instruction to the ammonia fuel injection system to inject the ammonia fuel at a given timing, pressure and pulse width includes: generating an ammonia fuel injection command including an injection timing, a target injection pressure, and an injection pulse width based on the ammonia fuel injection amount; The ammonia fuel injection command is sent to the ammonia fuel injection system to control the injection of ammonia fuel according to the corresponding injection timing, target injection pressure and injection pulse width.

8. A marine ammonia fuel engine injection control system, characterized in that: The system comprises: Data acquisition module, used to collect operating parameters of marine ammonia fuel engines; a total energy demand acquisition module, connected to the data acquisition module, for querying a pre-calibrated total energy demand MAP diagram based on the operating condition parameters to obtain the total energy required by the marine ammonia fuel engine under the current operating condition; an ammonia substitution rate acquisition module, connected to the data acquisition module, for querying a pre-calibrated ammonia substitution rate MAP based on the operating condition parameters to obtain a basic ammonia substitution rate and correcting the basic ammonia substitution rate to obtain a final ammonia substitution rate; an ammonia fuel injection amount calculation module, connected to the total energy demand acquisition module and the ammonia substitution rate acquisition module, for calculating the energy required to be provided by the ammonia fuel based on the total energy and the ammonia substitution rate, and obtaining the ammonia fuel injection amount in combination with the efficiency and dynamic response characteristics of the injection system; an injection control module, connected to the ammonia fuel injection amount calculation module, for generating a corresponding ammonia fuel injection instruction based on the ammonia fuel injection amount and sending the instruction to the ammonia fuel injection system to inject the ammonia fuel at a given timing, pressure and pulse width; A feedback correction module is connected to the ammonia fuel injection quantity module and the injection control module, and is used to perform feedback correction on the ammonia fuel injection quantity based on the combustion state, emission parameters and operating parameters of the ammonia fuel engine monitored in real time.

9. An electronic terminal, characterized in that: include: one or more memories and one or more processors; The one or more memories are used to store computer programs; The one or more processors, connected to the memory, are configured to run the computer program to perform the method as claimed in claim 7.

10. A computer-readable storage medium, characterized in that A computer program is stored, which is used to execute the method as claimed in claim 7 when executed by one or more processors.

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