Hydrogen fuel engine control method, hydrogen fuel engine system, vehicle

Abstract

The present invention discloses a control method for a hydrogen fuel engine, a hydrogen fuel engine system, and a vehicle. The method includes the following steps: obtaining torque information, intake air information, and exhaust information of the hydrogen fuel engine, where the torque information at least includes current torque and required torque, the intake air information at least includes intake air volume and hydrogen injection volume, and the exhaust information at least includes excess air coefficient and a preset coefficient range; adjusting the intake air volume and hydrogen injection volume based on the torque information, intake air information, and exhaust information so that the torque of the hydrogen fuel engine reaches the required torque, wherein during the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range. The present invention solves the technical problems of large fluctuations in the excess air coefficient and high NOx emissions in the related art.

Description

Technical Field

[0001] The present invention relates to the field of engine control, and in particular to a hydrogen fuel engine control method, a hydrogen fuel engine system, and a vehicle. Background Art

[0002] With the continuous application of new engine technologies, engine bench test methods and technologies also need to be continuously innovated. Engine tests are becoming more and more complex, and the workload is increasing exponentially. Traditional manual tests can no longer meet actual needs, and test automation is increasingly valued by engineering testers.

[0003] In automated engine testing, one of the most commonly used control variables is engine load. Load parameters are not fixed but vary with test requirements. Common load variables include throttle, relative charge volume, torque, and intake manifold pressure. Different load parameters require different control methods. Conventional test benches typically adjust the engine's throttle (or throttle valve) to achieve load control. However, different load parameters vary differently with throttle opening, necessitating separate tuning of the throttle controller's PID parameters based on the load parameter type. PID parameter tuning is challenging and complex, and can easily lead to control diffusion without regression, resulting in engine runaway and potentially damaging the engine. Furthermore, for newly developed supercharged engines, load control typically involves controlling both the throttle and the supercharger, posing the challenge of simultaneously controlling two parameters. However, test benches can only control one parameter, not both, making existing control methods inadequate for testing. Load control is crucial in automated testing; unstable or inaccurate load control can render testing impossible.

[0004] Currently, most hydrogen-fueled engines use a lean burn strategy. Although hydrogen combustion only produces water, it generates significant NOx emissions under high-temperature, oxygen-rich conditions. There are two approaches to addressing NOx emissions: ultra-lean burn, which reduces the combustion temperature to below the minimum NOx generation temperature, bringing NOx emissions close to zero. Lean burn aftertreatment, employing SCR (Selective Catalytic Reduction) and LNT (Low-Nox Trap) in the exhaust line, ensures that NOx tail emissions meet requirements. However, this involves complex structural layouts, complex regeneration strategies and controls, and high costs.

[0005] Currently, hydrogen fuel engines at home and abroad are all in the research stage. There is no industry consensus on the industrial application route of passenger car hydrogen fuel engines, and their steady-state and transient controls are basically blank. No matter which of the above NOx emission solution methods is adopted, if the transient control is unreasonable, it will cause large fluctuations in the lean combustion degree (excess air coefficient λ). When λ is relatively rich, it will lead to a high combustion temperature and a sharp increase in NOx emissions. If Solution 1 is adopted, it will cause the NOx emissions to exceed the limit. If Solution 2 is adopted, it will cause the aftertreatment device to need to be regenerated frequently, with complex control, increased costs, and shortened service life.

[0006] In view of the problems of large fluctuations in the excess air coefficient and high NOx emissions that are prone to occur in the above transient control, no effective solution has been proposed yet. Summary of the Invention

[0007] Embodiments of the present invention provide a hydrogen fuel engine control method, a hydrogen fuel engine system, and a vehicle to at least solve the technical problems of large fluctuations in the excess air coefficient and high NOx emissions in the related art.

[0008] According to one aspect of the embodiments of the present invention, a hydrogen fuel engine control method is provided. The method includes the following steps: obtaining torque information, intake information, and exhaust information of the hydrogen fuel engine, where the torque information at least includes the current torque and the required torque, the intake information at least includes the intake air volume and the hydrogen injection volume, and the exhaust information at least includes the excess air coefficient and a preset coefficient range; based on the torque information, intake information, and exhaust information, adjusting the intake air volume and the hydrogen injection volume so that the torque of the hydrogen fuel engine reaches the required torque, where during the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range.

[0009] Optionally, the exhaust information further includes a target excess air coefficient, and the method further includes: based on the torque information, intake information, and the preset coefficient range, adjusting the intake air volume and the hydrogen injection volume so that the excess air coefficient reaches the target excess air coefficient.

[0010] Optionally, adjusting the intake air volume and the hydrogen injection volume based on the torque information, intake information, and exhaust information includes: when it is determined that the required torque is greater than the current torque, controlling the intake air volume to increase until the excess air coefficient reaches a first coefficient value; when it is determined that the excess air coefficient reaches the first coefficient value, controlling the hydrogen injection volume and the intake air volume to increase until the excess air coefficient reaches a second coefficient value, where the second coefficient value is greater than or equal to the lower limit of the preset coefficient range; when it is determined that the excess air coefficient reaches the second coefficient value, generating a control instruction set based on the difference between the current torque and the required torque, and the control instruction set is at least used to control the intake air volume to increase until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient.

[0011] Optionally, the control instruction set includes a first control instruction and a second control instruction. When the excess air coefficient reaches the second coefficient value, a control instruction set is generated based on the difference between the current torque and the required torque, including: when the difference satisfies the first preset condition, generating the first control instruction, which is used to control the increase of the intake air volume until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient; when the difference satisfies the second preset condition, generating the second control instruction, which is used to control the increase of the intake air volume and the hydrogen injection volume until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient.

[0012] Optionally, the method further includes: during the process of controlling the increase of the hydrogen injection volume and the intake air volume until the excess air coefficient reaches the second coefficient value, the torque of the hydrogen fuel engine increases at a first rate; during the process of controlling the increase of the intake air volume and the hydrogen injection volume until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient, the torque of the hydrogen fuel engine increases at a second rate; wherein, the first rate is greater than the second rate.

[0013] Optionally, the first preset condition is that the difference is less than the preset difference, and / or the second preset condition is that the difference is greater than or equal to the preset difference.

[0014] According to another aspect of the embodiments of the present invention, there is also provided a hydrogen fuel engine system, which is controlled by using the above-mentioned hydrogen fuel engine control method. The hydrogen fuel engine system includes: an acquisition module, which is used to acquire the torque information, intake information and exhaust information of the hydrogen fuel engine. The torque information at least includes the current torque and the required torque, the intake information at least includes the intake air volume and the hydrogen injection volume, and the exhaust information at least includes the excess air coefficient and the preset coefficient range; a control module, which is used to adjust the intake air volume and the hydrogen injection volume based on the torque information, intake information and exhaust information, so that the torque of the hydrogen fuel engine reaches the required torque. During the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range.

[0015] Optionally, the hydrogen fuel engine system further includes: an engine body, on which an intake manifold and an exhaust manifold are provided; an intake pipeline, which is connected to the intake manifold, and an air filter, a supercharger, an intercooler and a throttle are provided on the intake pipeline; an exhaust pipeline, which is connected to the exhaust manifold, and a lambda sensor and an oxidation catalytic converter are provided on the exhaust pipeline, wherein the lambda sensor is used to detect the excess air coefficient of the hydrogen fuel engine; a direct injection hydrogen supply system, which is arranged on the engine body, and the hydrogen nozzle of the direct injection hydrogen supply system extends into the combustion chamber of the engine body; a controller, which is electrically connected to the direct injection hydrogen supply system, and the hydrogen injection amount of the direct injection hydrogen supply system is adjusted by adjusting the hydrogen injection pulse width of the controller.

[0016] Optionally, the hydrogen fuel engine system further includes: a post-processor, which is arranged on the exhaust pipeline and is used for regeneratively treating the NOx exhaust gas generated by the hydrogen fuel engine.

[0017] According to another aspect of the embodiments of the present invention, a vehicle is further provided, including a hydrogen fuel engine system, and the hydrogen fuel engine system is the above-mentioned hydrogen fuel engine system.

[0018] In the embodiments of the present invention, torque information, intake information and exhaust information of the hydrogen fuel engine are obtained. The torque information at least includes the current torque and the required torque. The intake information at least includes the intake air volume and the hydrogen injection amount. The exhaust information at least includes the excess air coefficient and the preset coefficient range. Based on the torque information, intake information and exhaust information, the intake air volume and the hydrogen injection amount are adjusted so that the torque of the hydrogen fuel engine reaches the required torque. During the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range. In the torque adjustment process of the hydrogen fuel engine in the embodiments of the present invention, the excess air coefficient is always maintained within the preset coefficient range, avoiding the problem of large fluctuations in the excess air coefficient during the engine torque adjustment process in the prior art, making the excess air coefficient change smoothly. The preset coefficient range is set as the coefficient range far from the high NOx emission area, so that the excess air coefficient does not enter the high NOx emission area, thereby achieving the purpose of controlling the NOx emission amount during the torque adjustment process, avoiding the problem of excessive NOx emission, and realizing the technical effect of low NOx emission or even close to zero emission. The technical solution of this embodiment solves the technical problems of large fluctuations in the excess air coefficient and high NOx emission in the related art. Description of the Drawings

[0019] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1It is a hardware structure block diagram of an electronic device of a vehicle according to an embodiment of the present invention;

[0021] Figure 2 It is a flowchart of a hydrogen fuel engine control method according to an alternative embodiment of the present invention;

[0022] Figure 3 It is a structure block diagram of a hydrogen fuel engine system according to an embodiment of the present invention;

[0023] Figure 4 It is a schematic structural diagram of a hydrogen fuel engine system according to an alternative embodiment of the present invention;

[0024] Figure 5 It is a schematic structural diagram of a hydrogen fuel engine system according to an alternative embodiment of the present invention;

[0025] Figure 6 It is a flowchart of a hydrogen fuel engine control method according to an alternative embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the state change of a hydrogen fuel engine according to an alternative embodiment of the present invention;

[0027] Figure 8 It is a torque-time curve graph of a hydrogen fuel engine according to an alternative embodiment of the present invention;

[0028] Figure 9 It is a NOx emission-excess air coefficient curve graph of a hydrogen fuel engine according to an alternative embodiment of the present invention.

[0029] Among them, the above-mentioned drawings include the following reference numerals:

[0030] 1. Intake pipeline; 2. Air filter; 3. Supercharger; 4. Intercooler; 5. Throttle valve; 6. Intake manifold; 7. Direct injection hydrogen supply system; 8. Exhaust manifold; 9. Exhaust pipeline; 10. Lambda sensor; 11. Oxidation catalytic converter; 12. Aftertreatment device. Detailed implementation manners

[0031] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order different from those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] According to one embodiment of the present invention, an embodiment of a hydrogen fuel engine control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here.

[0034] This method embodiment can be executed in an electronic device or a similar computing device that includes a memory and a processor in a vehicle. Taking running on the electronic device of a vehicle as an example, as Figure 1 shown, the electronic device of the vehicle may include one or more processors 102 (the processor may include, but is not limited to, a processing device such as a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microprocessor (MCU), a field programmable gate array (FPGA), a neural network processor (NPU), a tensor processor (TPU), an artificial intelligence (AI) type processor, etc.) and a memory 104 for storing data. Optionally, the above-mentioned electronic device of the vehicle may further include a transmission device 106 for communication functions, an input / output device 108, and a display 110. Those of ordinary skill in the art can understand that Figure 1 the structure shown is only schematic and does not limit the structure of the above-mentioned electronic device of the vehicle. For example, the electronic device of the vehicle may further include more or fewer components than those described in the above structure, or have a configuration different from that described in the above structure.

[0035] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the hydrogen fuel engine control method in the embodiments of the present invention. The processor 102 executes various functional applications and data processing by running the computer programs stored in the memory 104, that is, the above-mentioned hydrogen fuel engine control method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some instances, the memory 104 may further include a memory remotely disposed relative to the processor 102, and these remote memories can be connected to the mobile terminal through a network. Examples of the above-mentioned network include but are not limited to the Internet, enterprise intranet, local area network, mobile communication network, and combinations thereof.

[0036] The transmission device 106 is used to receive or send data via a network. Specific examples of the above-mentioned network may include a wireless network provided by a communication provider of the mobile terminal. In one instance, the transmission device 106 includes a network adapter (Network Interface Controller, abbreviated as NIC), which can be connected to other network devices through a base station and thus can communicate with the Internet. In one instance, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0037] The display 110 can be, for example, a touch-screen liquid crystal display (LCD). The liquid crystal display enables the user to interact with the user interface of the mobile terminal. In some embodiments, the above-mentioned mobile terminal has a graphical user interface (GUI), and the user can perform human-computer interaction with the GUI through finger contacts and / or gestures on the touch-sensitive surface. The human-computer interaction function here optionally includes the following interactions: creating web pages, drawing, word processing, creating electronic documents, games, video conferencing, instant messaging, sending and receiving emails, call interfaces, playing digital videos, playing digital music, and / or web browsing, etc. The executable instructions for performing the above human-computer interaction functions are configured / stored in a computer program product or readable storage medium executable by one or more processors.

[0038] In this embodiment, a hydrogen fuel engine control method running on the above-mentioned electronic device of the vehicle is provided. Figure 2 It is a flowchart of the hydrogen fuel engine control method according to an embodiment of the present invention, as Figure 2 shown, and the process includes the following steps:

[0039] Step S21: Obtain the torque information, intake information, and exhaust information of the hydrogen fuel engine. The torque information includes at least the current torque and the demanded torque. The intake information includes at least the intake air volume and the hydrogen injection volume. The exhaust information includes at least the excess air coefficient and the preset coefficient range.

[0040] Specifically, in step S21, the current torque is the real-time output torque of the hydrogen fuel engine, the intake air volume is the real-time intake air volume of the hydrogen fuel engine, the hydrogen injection volume is the real-time hydrogen injection volume of the hydrogen fuel engine, the excess air coefficient is the excess air coefficient obtained by real-time monitoring of the hydrogen fuel engine, and the preset coefficient range is the numerical range of λ (excess air coefficient) between the λ boundary value with high NOx emissions obtained by prior experiments and the combustion stability boundary. According to the emission mechanism of NOx generated by hydrogen combustion, the λ boundary values with high NOx emissions at different torques are defined; according to the ultra-lean combustion stability, the combustion stability boundaries at different torques are defined.

[0041] Step S22: Based on the torque information, intake information, and exhaust information, adjust the intake air volume and the hydrogen injection volume so that the torque of the hydrogen fuel engine reaches the demanded torque. During the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range.

[0042] Specifically, in step S22, maintaining the excess air coefficient between the λ boundary value with high NOx emissions and the combustion stability boundary can effectively reduce NOx emissions.

[0043] Through the above steps, obtain the torque information, intake information, and exhaust information of the hydrogen fuel engine. The torque information includes at least the current torque and the demanded torque. The intake information includes at least the intake air volume and the hydrogen injection volume. The exhaust information includes at least the excess air coefficient and the preset coefficient range. Based on the torque information, intake information, and exhaust information, adjust the intake air volume and the hydrogen injection volume so that the torque of the hydrogen fuel engine reaches the demanded torque. During the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range. In the torque adjustment process of the hydrogen fuel engine in the embodiment of the present invention, the excess air coefficient is always maintained within the preset coefficient range, avoiding the problem of large fluctuations in the excess air coefficient during the engine torque adjustment process in the prior art, making the excess air coefficient change smoothly. The preset coefficient range is set as the coefficient range away from the high NOx emission area, so that the excess air coefficient does not enter the high NOx emission area, thereby achieving the purpose of controlling NOx emissions during the torque adjustment process, avoiding the problem of excessive NOx emissions, and realizing the technical effect of low NOx emissions or even close to zero emissions. The technical solution of this embodiment solves the technical problems of large fluctuations in the excess air coefficient and high NOx emissions in the related art.

[0044] Optionally, the exhaust information further includes a target excess air ratio. In step S22, the method further includes:

[0045] Step S23: Based on the torque information, intake air information, and a preset coefficient range, adjust the intake air volume and hydrogen injection volume so that the excess air ratio reaches the target excess air ratio.

[0046] It should be noted that in step S23, the target excess air ratio can be a preset value. For example, the optimal excess air ratio corresponding to different torques obtained through prior experiments. Making the excess air ratio reach the target excess air ratio can keep the hydrogen fuel engine in the best operating state and the NOx emissions in the optimal state. The target excess air ratio can also be calculated based on multiple pieces of information during the operation of the hydrogen fuel engine. For example, the hydrogen fuel engine can perform comprehensive calculation and analysis based on the current ambient temperature, the current engine torque, the operating conditions of various components within the hydrogen fuel engine system, user demand information, etc., to obtain the final target excess air ratio. Such a setting can make the adjustment of the excess air ratio and NOx emissions more in line with user needs.

[0047] In steps S21 - S23, those skilled in the art should understand that "the torque of the hydrogen fuel engine reaches the required torque" and "the excess air ratio reaches the target excess air ratio" do not necessarily mean that the torque value is equal to the required torque and the excess air ratio is equal to the target excess air ratio. When the fluctuations of the torque and excess air ratio of the hydrogen fuel engine are within a certain error range, it can also be considered that the torque of the hydrogen fuel engine reaches the required torque and the excess air ratio reaches the target excess air ratio. For example, when the torque of the hydrogen fuel engine fluctuates by 0.005% relative to the required torque, it can also be determined that the torque of the hydrogen fuel engine has reached the required torque. For instance, when the required torque is 500 N·m, when the torque of the hydrogen fuel engine stabilizes within 497.5 N·m - 502.5 N·m, it can be considered that the torque of the hydrogen fuel engine has reached the required torque, and the same applies to the excess air ratio. The error range can be adjusted according to vehicle models, engine model structures, user demands, vehicle operating conditions information, etc.

[0048] Optionally, based on the torque information, intake air information, and exhaust information, adjusting the intake air volume and hydrogen injection volume includes:

[0049] Step S221: When it is determined that the required torque is greater than the current torque, control the intake air volume to increase until the excess air ratio reaches the first coefficient value;

[0050] Those skilled in the art should understand that when the intake air amount is increased alone and the hydrogen injection amount remains unchanged, the excess air coefficient will continue to increase. Increasing the intake air amount alone in step S221 to increase the excess air coefficient can provide a surplus space for the fluctuation of the excess air coefficient generated when the hydrogen injection amount is increased subsequently. That is, when the hydrogen injection amount increases rapidly and the torque increases significantly, the excess air coefficient will decrease. Since the excess air coefficient has been increased to the first coefficient value in step S221, the excess air coefficient will not fluctuate rapidly and exceed the preset coefficient range, effectively ensuring the NOx emission effect during the torque process.

[0051] Preferably, to make the excess air coefficient reach the first coefficient value quickly, the intake air amount is increased by twice the original intake air amount (the original intake air amount here refers to the intake air amount before the intake air amount starts to increase in step S221).

[0052] Step S222, when it is determined that the excess air coefficient reaches the first coefficient value, control the hydrogen injection amount and the intake air amount to increase until the excess air coefficient reaches the second coefficient value, where the second coefficient value is greater than or equal to the lower limit value of the preset coefficient range;

[0053] Those skilled in the art should understand that in step S222, increasing the hydrogen injection amount alone will cause the torque to increase rapidly and the excess air coefficient to decrease rapidly. At this time, increasing the intake air amount simultaneously can slow down the decreasing rate of the excess air coefficient, maintain the excess air coefficient within the preset coefficient range, and avoid excessive NOx emissions.

[0054] [[ID=,12]]Step S223, when it is determined that the excess air coefficient reaches the second coefficient value, generate a control instruction set based on the difference between the current torque and the required torque. The control instruction set is at least used to control the intake air amount to increase until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient.

[0055] Through steps S221 - S223, first ensure that the hydrogen injection amount remains unchanged and the intake air amount is increased alone to increase the excess air coefficient; then increase the intake air amount and the hydrogen injection amount simultaneously to significantly increase the torque, while ensuring that the excess air coefficient is greater than or equal to the lower limit value of the preset coefficient range; finally, based on the difference between the current torque and the required torque, control the intake air amount to increase until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient. In steps S221 - S223, the excess air coefficient is always within the preset coefficient range, effectively reducing NOx emissions.

[0056] Optionally, in step S223, the control instruction set includes a first control instruction and a second control instruction. When the excess air coefficient reaches the second coefficient value, generate a control instruction set based on the difference between the current torque and the required torque, including:

[0057] Step S2231: When the difference meets the first preset condition, generate a first control instruction for controlling the intake air volume to increase until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient.

[0058] Those skilled in the art should understand that in step S2231, when the difference meets the first preset condition, only the intake air volume is controlled to increase. At this time, the torque of the hydrogen fuel engine remains unchanged and the excess air coefficient continues to increase. The first preset condition can be that the difference is zero (i.e., the current torque is equal to the required torque), or the difference is within a certain numerical range (for example, the difference is less than 0.001 N·m). Optionally, the first preset condition can also be a judgment condition after comprehensive analysis of information such as the operating conditions of the hydrogen fuel engine, vehicle conditions, and user requirements.

[0059] Step S2232: When the difference meets the second preset condition, generate a second control instruction for controlling the intake air volume and hydrogen injection volume to increase until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient.

[0060] Those skilled in the art should understand that in step S2232, when the intake air volume and hydrogen injection volume increase, the torque of the hydrogen fuel engine increases and the excess air coefficient increases. Optionally, the second preset condition can be adjusted according to information such as the operating conditions of the hydrogen fuel engine, vehicle conditions, and user requirements.

[0061] Through steps S2231 and S2232, when the difference meets different conditions, the corresponding control strategies are different, making the torque adjustment more reasonable, the excess air coefficient adjustment more accurate, and saving the energy consumption of engine components.

[0062] Optionally, the method further includes:

[0063] In step S222, during the process of controlling the hydrogen injection volume and intake air volume to increase until the excess air coefficient reaches the second coefficient value, the torque of the hydrogen fuel engine increases at the first rate.

[0064] It should be noted that in step S222, by increasing the hydrogen injection amount and the intake air amount simultaneously, the torque of the hydrogen fuel engine increases at a first rate and the excess air coefficient decreases to a second coefficient value. To achieve this technical effect, the increment of the hydrogen injection amount can be much larger than the increment of the intake air amount, or the increase rate of the hydrogen injection amount can be much larger than the increase rate of the intake air amount. For example, the hydrogen injection amount is increased by twice the original hydrogen injection amount (the original hydrogen injection amount here refers to the hydrogen injection amount before starting to increase the hydrogen injection amount in step S222), and the intake air amount is increased by once the original intake air amount (the original intake air amount here refers to the intake air amount after step S221 is completed and before starting to increase the intake air amount in step S222).

[0065] In step S2232, during the process of controlling the intake air amount and the hydrogen injection amount to increase until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient, the torque of the hydrogen fuel engine increases at a second rate;

[0066] Among them, the first rate is greater than the second rate.

[0067] It should be noted that in step S2232, by increasing the hydrogen injection amount and the intake air amount simultaneously, the torque of the hydrogen fuel engine increases at a second rate and the excess air coefficient increases to the target excess air coefficient. To achieve this technical effect, the increment of the hydrogen injection amount can be the same as the increment of the intake air amount, or the increase rate of the hydrogen injection amount can be the same as the increase rate of the intake air amount. For example, the hydrogen injection amount is increased by once the original hydrogen injection amount (the original hydrogen injection amount here refers to the hydrogen injection amount before starting to increase the hydrogen injection amount in step S2232), and the intake air amount is increased by once the original intake air amount (the original intake air amount here refers to the intake air amount after step S222 is completed and before starting to increase the intake air amount in step S2232).

[0068] Through the above steps, the torque of the hydrogen fuel engine increases significantly in step S222, and the difference between the torque after step S222 and the required torque is already small. In step S2232, the increase rate of the torque is reduced, making the change of the torque relatively slow, which is convenient for detecting small changes in the torque, achieving precise monitoring of the torque, avoiding the torque increasing too fast and exceeding the required torque, increasing subsequent adjustment work, and also reducing the work of parts and avoiding excessive wear of parts. At the same time, the slower change of the excess air coefficient due to the smaller increment or increase rate of the hydrogen injection amount is also convenient for adjusting the excess air coefficient to the target excess air coefficient.

[0069] Optionally, in step S2231 and step S2232, the first preset condition is that the difference is less than a preset difference, and / or the second preset condition is that the difference is greater than or equal to the preset difference. When the difference is small, it can be considered that the torque already meets the requirement at this time, that is, the torque output by the hydrogen fuel engine has reached the required torque. At this time, only the intake air amount is controlled to increase, so as to quickly increase the excess air ratio to the target excess air ratio, so that the vehicle has a better NOx emission effect; when the difference is large, at this time, the hydrogen injection amount is required to increase the torque to the required torque. Increasing the hydrogen injection amount alone will cause the excess air ratio to decrease. At this time, increasing the intake air amount at the same time can increase the excess air ratio, so that the excess air ratio is always within the preset coefficient range during the adjustment process, avoiding excessive NOx emissions. During the adjustment process, by controlling parameters such as the increment and increase rate of the hydrogen injection amount and the intake air amount, the excess air ratio and the output torque of the engine can reach the target values (i.e., the target excess air ratio and the required torque) at the same time. Those skilled in the art should understand that the adjustment time of the excess air ratio and the output torque of the engine is not limited here, and they can reach the target values at the same time or successively.

[0070] Specifically, the preset difference can be a fixed specific value, such as 5 N·m, 1 N·m, 0.5 N·m, 0.1 N·m, 0.05 N·m, 0.01 N·m, etc., or a fixed proportional value of the required torque. For example, the preset difference can be 5%, 1%, 0.5%, 0.1%, 0.05%, 0.01% of the required torque, etc.

[0071] According to another aspect of the embodiments of the present invention, a hydrogen fuel engine system is further provided, and the hydrogen fuel engine system is controlled by using the above hydrogen fuel engine control method.

[0072] Figure 3 is a structural block diagram of a hydrogen fuel engine according to an embodiment of the present invention, as Figure 3 shown, the hydrogen fuel engine system includes: an acquisition module 30, and the acquisition module 30 is used to acquire torque information, intake air information and exhaust information of the hydrogen fuel engine. The torque information at least includes the current torque and the required torque, the intake air information at least includes the intake air amount and the hydrogen injection amount, and the exhaust information at least includes the excess air ratio and the preset coefficient range; a control module 32, and the control module 32 is used to adjust the intake air amount and the hydrogen injection amount based on the torque information, the intake air information and the exhaust information, so that the torque of the hydrogen fuel engine reaches the required torque. Among them, during the adjustment process, the excess air ratio of the hydrogen fuel engine is always within the preset coefficient range.

[0073] Applying the hydrogen fuel engine system in this embodiment, the acquisition module 30 is used to acquire the torque information, intake information, and exhaust information of the hydrogen fuel engine. The torque information at least includes the current torque and the required torque. The intake information at least includes the intake air volume and the hydrogen injection volume. The exhaust information at least includes the excess air coefficient and the preset coefficient range. The control module 32 is used to adjust the intake air volume and the hydrogen injection volume based on the torque information, intake information, and exhaust information, so that the torque of the hydrogen fuel engine reaches the required torque. Among them, during the adjustment process, the excess air coefficient of the hydrogen fuel engine always remains within the preset coefficient range. In the torque adjustment process of the hydrogen fuel engine in the embodiment of the present invention, the excess air coefficient is always maintained within the preset coefficient range, avoiding the problem of large fluctuations in the excess air coefficient during the engine torque adjustment process in the prior art, making the excess air coefficient change smoothly. The preset coefficient range is set as the coefficient range away from the high NOx emission area, so that the excess air coefficient does not enter the high NOx emission area, thereby achieving the purpose of controlling the NOx emission during the torque adjustment process, avoiding the problem of excessive NOx emission, and realizing the technical effect of low NOx emission or even close to zero emission. The technical solution of this embodiment solves the technical problems of large fluctuations in the excess air coefficient and high NOx emission in the related art.

[0074] It should be noted that the above-mentioned various modules can be implemented by software or hardware. For the latter, it can be achieved in the following ways, but not limited to this: the above-mentioned modules are all located in the same processor; or, the above-mentioned various modules are respectively located in different processors in any combination form.

[0075] Optionally, as Figure 4 and Figure 5 shown, the hydrogen fuel engine system further includes an engine body, an intake pipe 1, an exhaust pipe 9, a direct injection hydrogen supply system 7, and a controller. An intake manifold 6 and an exhaust manifold 8 are provided on the engine body; the intake pipe 1 is connected to the intake manifold 6, and an air filter 2, a supercharger 3, an intercooler 4, and a throttle valve 5 are provided on the intake pipe 1; the exhaust pipe 9 is connected to the exhaust manifold 8, and a λ sensor 10 and an oxidation catalytic converter 11 are provided on the exhaust pipe 9. Among them, the λ sensor 10 is used to detect the excess air coefficient of the hydrogen fuel engine; the direct injection hydrogen supply system 7 is provided on the engine body, and the hydrogen nozzle of the direct injection hydrogen supply system 7 extends into the combustion chamber of the engine body; the controller is electrically connected to the direct injection hydrogen supply system 7, and the hydrogen injection volume of the direct injection hydrogen supply system 7 is adjusted by adjusting the hydrogen injection pulse width of the controller.

[0076] In the hydrogen fuel engine system of this embodiment, the λ sensor 10 is provided to monitor λ (i.e., the excess air coefficient). By controlling the direct injection hydrogen supply system 7, the hydrogen injection amount in the hydrogen fuel engine can be adjusted. By providing the supercharger 3 and adjusting the intake pressure of the supercharger 3, the intake air amount of the hydrogen fuel engine can be adjusted. The settings of the λ sensor 10, the supercharger 3, and the direct injection hydrogen supply system 7 achieve the transient control and transient monitoring of the hydrogen fuel engine system, supporting the implementation of the aforementioned hydrogen fuel engine control method. Moreover, by using the aforementioned hydrogen fuel engine control method to control the hydrogen fuel engine system of this embodiment, it is ensured that there is no NOx emission during the dynamic process, so that there is no need to set up a separate tail gas treatment device, reducing costs and the structural complexity.

[0077] It should be noted that, in this embodiment, the controller includes the aforementioned acquisition module 30 and control module 32. The controller can be the vehicle total controller, or an engine controller separately provided on the engine body, or part of the controller can be provided on the engine body and another part of the controller can be provided in the vehicle total controller. For example, the acquisition module 30 is provided on the engine body and the control module 32 is provided in the vehicle total controller. Optionally, the controller can further include more modules, such as an execution module, a communication module, and a display module. The execution module can be used to implement specific execution actions, such as adjusting the circuit settings and mechanical structure settings of the supercharger 3, etc. The communication module is used to implement vehicle internal communication or communication between the vehicle and external devices. The communication module can communicate in various ways such as wireless or wired. For example, the communication module can be used to transmit vehicle data to the user device in real time, facilitating the user to view and understand the vehicle operation status, tail gas emission status, etc. The user device can be devices such as a mobile phone, a tablet, a computer, and a smart watch. The display module is used to display vehicle conditions, engine status information, etc. For example, the display module can be a display screen inside the vehicle, and the display screen can display the excess air coefficient, vehicle speed, and NOx emission information in real time, so that the user can obtain information in real time, discover problems such as vehicle anomalies and engine status anomalies, and take corresponding measures.

[0078] Specifically, in an exemplary embodiment of the present application, an air filter 2, a supercharger 3, an intercooler 4, and a throttle valve 5 are sequentially arranged on the intake pipe 1 along the intake direction, and a λ sensor 10 and an oxidation catalytic converter 11 are sequentially arranged on the exhaust pipe 9 along the exhaust direction. The supercharger 3 can be of any type, such as turbocharging, electric supercharging, or mechanical supercharging, etc. The hydrogen fuel engine system in this embodiment adopts the in-cylinder direct injection injection method, but the hydrogen fuel engine system in this embodiment can also be an intake port injection and a dual injection system.

[0079] Optionally, as Figure 5As shown in the figure, the hydrogen fuel engine system further includes a post-processor 12. The post-processor 12 is disposed on the exhaust gas pipeline 9 and is used for regenerating and treating the NOx waste gas generated by the hydrogen fuel engine. By providing the post-processor 12, the NOx waste gas emission of the hydrogen fuel engine system is reduced, so that the NOx tail emission of the hydrogen fuel engine system meets the requirements.

[0080] Specifically, in an exemplary embodiment of the present application, the post-processor 12 is a NOx post-treatment device such as an SCR (Selective Catalytic Reduction device) or an LNT (NOx Trap device).

[0081] When the hydrogen fuel engine control method in the above embodiment is applied to a hydrogen fuel engine system having a post-processor 12, by continuously controlling λ (i.e., the excess air coefficient), λ is always within a preset coefficient range, avoiding large fluctuations in λ, and controlling λ within a range far from the high NOx emission area, so that the NOx emission is always low. The post-processor 12 performs post-treatment of the tail gas, and the NOx emission of the hydrogen fuel engine is close to zero, meeting the emission requirements. At the same time, the control of λ can also reduce the regeneration frequency of the post-processor 12, reduce the size of the post-processor 12, extend the service life, and reduce the production and manufacturing cost.

[0082] According to another aspect of the embodiments of the present invention, a preferred embodiment of a hydrogen fuel engine control method is further provided. To facilitate understanding of this embodiment, the NOx emission mechanism of the hydrogen fuel engine in this embodiment is explained as follows:

[0083] As Figure 9 shown, the horizontal axis is the value of λ (i.e., the excess air coefficient), and the vertical axis is the NOx emission. The NOx first increases and then decreases as the excess air coefficient λ increases. When λ≥2.5, the NOx zero emission can be basically achieved. When the transient λ is enriched from 2.5 to 1.6, the NOx emission will increase by thousands of times, and at this time, the NOx emission cannot meet the emission requirements. During the actual vehicle driving process, if the torque demand increases, simply increasing the hydrogen injection amount is likely to cause excessive concentration and generate a large amount of NOx.

[0084] In this embodiment, according to the emission mechanism of NOx generated by hydrogen combustion, the λ boundary values with high NOx emission for different torques are defined; according to the ultra-lean combustion stability, the combustion stability boundaries for different torques are defined. By maintaining λ between the λ boundary value with high NOx emission and the combustion stability boundary, the NOx emission can be effectively reduced. The numerical range of λ between the λ boundary value with high NOx emission and the combustion stability boundary in this embodiment is the preset coefficient range in the foregoing embodiment.

[0085] As Figure 6 shown, the hydrogen fuel engine control method in this embodiment includes the following steps:

[0086] Step 1: Detect the required torque and excess air coefficient λ of the whole vehicle, determine that the current engine operating state is ①, and jump to Step 2;

[0087] Step 2: Determine whether the required torque of the whole vehicle increases. If it does, jump to Step 3; if not, jump to Step 6;

[0088] Those skilled in the art should understand that an increase in the required torque of the whole vehicle means that the required torque is greater than the current torque of the hydrogen fuel engine, and the torque of the hydrogen fuel engine needs to be increased.

[0089] Step 3: Adjust the supercharging control to increase the intake pressure, thereby increasing the intake air volume, with the goal of λ reaching the target value, i.e., state ②, and jump to Step 4;

[0090] It should be noted that the target value in Step 3 is the aforementioned first coefficient value. In Step 3, ensure that the hydrogen injection volume remains unchanged, increase the intake air volume through supercharging and other means, and increase λ in the cylinder.

[0091] Step 4: Increase the hydrogen injection pulse width, thereby increasing the hydrogen injection volume and boosting the torque, with the goal of λ reaching the boundary limit value of NOx generation, i.e., state ③, and jump to Step 5;

[0092] It should be noted that in Step 4, either only the hydrogen injection volume can be increased, or both the hydrogen injection volume and the intake air volume can be increased simultaneously, with the increase in the hydrogen injection volume being greater than the increase in the intake air volume. The main purpose of Step 4 is to significantly increase the torque. In Step 4, λ continues to decrease, and λ should always be kept not less than the boundary limit value of NOx generation.

[0093] Step 5: Adjust the supercharging control to increase the intake pressure and appropriately increase the hydrogen injection pulse width, with the goal of achieving the required torque, i.e., state ④, and jump to Step 2;

[0094] Specifically, in Step 5, based on the difference between the torque already achieved by the hydrogen fuel engine and the required torque, decide whether to only increase the intake air volume or increase both the intake air volume and the hydrogen injection volume simultaneously to reach the required torque and the target λ.

[0095] Step 6: End.

[0096] In the above method steps, the switching of λ, torque boost, and air volume change during the transient process are as Figure 7 and Figure 8As shown in the figure, when the required torque increases, first ensure that the hydrogen injection amount remains unchanged. Increase the intake air amount through methods such as supercharging to improve the λ in the cylinder, and then increase the hydrogen injection amount to significantly increase the torque, while ensuring that λ > the boundary value for NOx production. Finally, according to the difference between the achieved torque and the required torque, increase both the intake air amount and the hydrogen injection amount, or only increase the intake air amount (determined according to the difference), to reach the required torque and the target λ, thereby achieving the goal of no NOx generation during the transient torque increase process. The solution of this embodiment takes torque increase and the λ-NOx production boundary value as key parameters, divides the torque increase process into 4 stages, and realizes the target values of the 4 stages through the adjustment of supercharging and hydrogen injection, thereby achieving the technical effect of no NOx emission during the dynamic process.

[0097] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0098] An embodiment of the present invention also provides a storage medium, in which a computer program is stored, and the computer program is set to execute the steps in any one of the above method embodiments when running.

[0099] Optionally, in this embodiment, the above storage medium can be set to store a computer program for executing the following steps:

[0100] Step S1, obtain the torque information, intake air information, and exhaust information of the hydrogen fuel engine. The torque information includes at least the current torque and the required torque, the intake air information includes at least the intake air amount and the hydrogen injection amount, and the exhaust information includes at least the excess air coefficient and the preset coefficient range;

[0101] Step S2, based on the torque information, intake air information, and exhaust information, adjust the intake air amount and the hydrogen injection amount so that the torque of the hydrogen fuel engine reaches the required torque. During the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range.

[0102] Optionally, in this embodiment, the above storage medium may include, but is not limited to: various media such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), external hard drives, magnetic disks, or optical discs that can store computer programs.

[0103] An embodiment of the present invention also provides a processor, which is configured to run a computer program to execute the steps in any one of the above method embodiments.

[0104] Optionally, in this embodiment, the above processor may be configured to execute the following steps through a computer program:

[0105] Step S1: Obtain torque information, intake information, and exhaust information of a hydrogen fuel engine. The torque information includes at least the current torque and the required torque. The intake information includes at least the intake air volume and the hydrogen injection volume. The exhaust information includes at least the excess air coefficient and a preset coefficient range.

[0106] Step S2: Based on the torque information, intake information, and exhaust information, adjust the intake air volume and the hydrogen injection volume so that the torque of the hydrogen fuel engine reaches the required torque. During the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range.

[0107] An embodiment of the present invention also provides a vehicle, including a hydrogen fuel engine system, which is the above hydrogen fuel engine system, and the hydrogen fuel engine system is controlled by the hydrogen fuel engine control method in the above embodiment.

[0108] Optionally, specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and will not be elaborated herein.

[0109] The above serial numbers of the embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0110] In the above Embodiment 3 of the present invention, the descriptions of each embodiment have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0111] In several embodiments provided by the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the units can be a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the couplings or direct couplings or communication connections shown or discussed with each other can be through some interfaces. The indirect couplings or communication connections of units or modules can be in electrical or other forms.

[0112] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0113] In addition, in each embodiment of the present invention, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0114] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This 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 each embodiment of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks or optical discs that can store program codes.

[0115] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A control method for a hydrogen fuel engine, characterized in that, The method includes the following steps: Obtain the torque information, intake air information, and exhaust information of the hydrogen fuel engine. The torque information includes at least the current torque and the required torque. The intake air information includes at least the intake air volume and the hydrogen injection volume. The exhaust information includes at least the excess air coefficient and the preset coefficient range; Based on the torque information, the intake air information, and the exhaust information, adjust the intake air volume and the hydrogen injection volume so that the torque of the hydrogen fuel engine reaches the required torque. During the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range; When it is determined that the required torque is greater than the current torque, control the intake air volume to increase until the excess air coefficient reaches the first coefficient value; When it is determined that the excess air coefficient reaches the first coefficient value, control the hydrogen injection volume and the intake air volume to increase until the excess air coefficient reaches the second coefficient value, where the second coefficient value is greater than or equal to the lower limit value of the preset coefficient range; When it is determined that the excess air coefficient reaches the second coefficient value, generate a control instruction set based on the difference between the current torque and the required torque. The control instruction set is at least used to control the intake air volume to increase until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient; 2. The method according to claim 1, wherein The exhaust information further includes the target excess air coefficient, and the method further includes: Based on the torque information, the intake air information, and the preset coefficient range, adjust the intake air volume and the hydrogen injection volume so that the excess air coefficient reaches the target excess air coefficient; 3. The method according to claim 1, wherein The control instruction set includes a first control instruction and a second control instruction. When it is determined that the excess air coefficient reaches the second coefficient value, generate a control instruction set based on the difference between the current torque and the required torque, including: When the difference satisfies the first preset condition, generate the first control instruction. The first control instruction is used to control the intake air volume to increase until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient; When the difference satisfies the second preset condition, generate the second control instruction. The second control instruction is used to control the intake air volume and the hydrogen injection volume to increase until the torque of the hydrogen fuel engine reaches the required torque and the excess air coefficient reaches the target excess air coefficient; 4. The method according to claim 3, wherein The method further includes: ​ ​ ​ 5. The method according to claim 3, characterized in that, The first preset condition is that the difference is less than a preset difference, and / or the second preset condition is that the difference is greater than or equal to the preset difference.

6. A hydrogen fuel engine system, characterized in that, The hydrogen fuel engine system is controlled by using the hydrogen fuel engine control method according to any one of claims 1-5, and the hydrogen fuel engine system includes: An acquisition module, which is used to acquire torque information, intake information, and exhaust information of the hydrogen fuel engine. The torque information at least includes current torque and required torque, the intake information at least includes intake air volume and hydrogen injection volume, and the exhaust information at least includes excess air coefficient and a preset coefficient range; A control module, which is used to adjust the intake air volume and the hydrogen injection volume based on the torque information, the intake information, and the exhaust information, so that the torque of the hydrogen fuel engine reaches the required torque. During the adjustment process, the excess air coefficient of the hydrogen fuel engine is always within the preset coefficient range.

7. The hydrogen fuel engine system according to claim 6, characterized in that, The hydrogen fuel engine system further includes: An engine body, on which an intake manifold (6) and an exhaust manifold (8) are provided; An intake pipeline (1), which is connected to the intake manifold (6). An air filter (2), a supercharger (3), an intercooler (4), and a throttle valve (5) are provided on the intake pipeline (1); An exhaust pipeline (9), which is connected to the exhaust manifold (8). A lambda sensor (10) and an oxidation catalytic converter (11) are provided on the exhaust pipeline (9), where the lambda sensor (10) is used to detect the excess air coefficient of the hydrogen fuel engine; A direct injection hydrogen supply system (7), which is arranged on the engine body, and the hydrogen nozzle of the direct injection hydrogen supply system (7) extends into the combustion chamber of the engine body; A controller, which is electrically connected to the direct injection hydrogen supply system (7), and adjusts the hydrogen injection volume of the direct injection hydrogen supply system (7) by adjusting the hydrogen injection pulse width of the controller.

8. The hydrogen fuel engine system according to claim 7, characterized in that, The hydrogen fuel engine system further includes: A post-processor (12), which is arranged on the exhaust pipeline (9), and the post-processor (12) is used to perform regeneration treatment on the NOx exhaust gas generated by the hydrogen fuel engine.

9. A vehicle, comprising a hydrogen fuel engine system, characterized in that, The hydrogen fuel engine system is the hydrogen fuel engine system according to any one of claims 6-8.

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