Hydrogen internal combustion engine jet ignition system and hydrogen internal combustion engine control method

Abstract

The invention relates to the technical field of hydrogen internal combustion engines, and particularly discloses a hydrogen internal combustion engine jet ignition system and a hydrogen internal combustion engine control method, and the hydrogen internal combustion engine jet ignition system comprises a hydrogen internal combustion engine main body, a pre-combustion chamber, a spark plug, a first hydrogen ejector and a second hydrogen ejector. Hydrogen fuel is injected into the pre-combustion cavity through the first hydrogen injector and is ignited by the spark plug after being fully mixed with fresh air pressed in in the compression process, a flame front capable of being diffused and spread is formed in the pre-combustion cavity, expanded high-temperature flames are continuously accelerated through the accelerating cavity and finally injected into the main combustion cavity, and a rapid jet flow flame source is formed. And the hydrogen-air mixed gas in the main combustion cavity is ignited, so that stable and reliable ignition of the hydrogen internal combustion engine is realized. By means of the arrangement, the speed of flames entering the main combustion cavity from the pre-combustion cavity is increased, stable and reliable ignition of the hydrogen internal combustion engine is guaranteed, and the problem that in the prior art, ignition is not stable when jet ignition is conducted through a pre-combustion chamber is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen internal combustion engines, and in particular to a hydrogen internal combustion engine jet ignition system and a control method for a hydrogen internal combustion engine. Background Technique

[0002] At present, hydrogen internal combustion engines can be mainly divided into intake port injection and in-cylinder direct injection according to the fuel supply method. Among them, in-cylinder direct injection hydrogen internal combustion engines can fundamentally avoid backfire and greatly eliminate the probability of pre-ignition and knocking. In order to improve the performance of in-cylinder direct injection hydrogen internal combustion engines, jet ignition is an excellent choice to achieve high performance and low emissions of in-cylinder direct injection hydrogen internal combustion engines, and a diesel engine with a pre-chamber is the best choice to achieve jet ignition. High-performance ignition of the hydrogen-air mixture in the main combustion chamber is achieved through pre-chamber jet ignition, reducing heat loss and improving thermal efficiency.

[0003] In related technologies, lean combustion is the mainstream technical route for future ultra-high thermal efficiency engines. Lean combustion refers to combustion when the air-fuel ratio is greater than the theoretical air-fuel ratio. The engine lean combustion technology is to make the air-fuel mixture burn more fully to achieve the purpose of reducing fuel consumption and emissions. However, in the lean combustion mode, when jet ignition is carried out through a pre-chamber in the prior art, there are problems of unstable ignition and slow fuel speed. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydrogen internal combustion engine jet ignition system and a control method for a hydrogen internal combustion engine to solve the problem of unstable ignition when jet ignition is carried out through a pre-chamber in the prior art.

[0005] On the one hand, the present invention provides a hydrogen internal combustion engine jet ignition system. The hydrogen internal combustion engine jet ignition system includes: a hydrogen internal combustion engine main body having a main combustion chamber; a pre-chamber provided on the hydrogen internal combustion engine main body and located at the top of the main combustion chamber. The pre-chamber has a pre-combustion chamber and an acceleration chamber that are interconnected. The acceleration chamber is connected to the main combustion chamber, and the acceleration chamber can accelerate the propagation of the flame in the pre-combustion chamber to the main combustion chamber; a spark plug provided on the top of the pre-chamber and connected to the pre-combustion chamber; a first hydrogen injector provided on the pre-chamber and connected to the pre-combustion chamber. The first hydrogen injector can inject hydrogen into the pre-combustion chamber; a second hydrogen injector provided on the hydrogen internal combustion engine main body and connected to the main combustion chamber. The second hydrogen injector can inject hydrogen into the main combustion chamber.

[0006] As an alternative technical solution of the hydrogen internal combustion engine jet ignition system, the acceleration chamber includes a conical section and a connecting section. The large end of the conical section is connected to the pre-combustion chamber, the small end of the conical section is connected to the connecting section, and the connecting section is connected to the main combustion chamber.

[0007] As an alternative technical solution of the hydrogen internal combustion engine jet ignition system, the pre-combustion chamber further includes a plurality of jet holes, and the plurality of jet holes are arranged at intervals at the bottom of the pre-combustion chamber. The communication section is communicated with the main combustion chamber through the jet holes, and the aperture of the jet holes is smaller than the diameter of the communication section.

[0008] As an alternative technical solution of the hydrogen internal combustion engine jet ignition system, the cavity shape of the pre-combustion chamber is cylindrical or spherical.

[0009] As an alternative technical solution of the hydrogen internal combustion engine jet ignition system, the hydrogen internal combustion engine jet ignition system further includes an intake valve and an exhaust valve. The intake valve and the exhaust valve are both arranged on the hydrogen internal combustion engine body and communicated with the main combustion chamber.

[0010] As an alternative technical solution of the hydrogen internal combustion engine jet ignition system, the hydrogen internal combustion engine body includes a cylinder head, a cylinder liner, and a concave piston crown. The cylinder head, the cylinder liner, and the concave piston crown enclose the main combustion chamber. The pre-combustion chamber and the second hydrogen injector are both arranged on the cylinder head.

[0011] On the other hand, the present invention provides a hydrogen internal combustion engine control method, which is applied to the hydrogen internal combustion engine jet ignition system in any of the above solutions. The hydrogen internal combustion engine has a diffusion combustion condition, a premixed combustion condition, and a mixed combustion condition. The hydrogen internal combustion engine control method includes:

[0012] Under the diffusion combustion condition, adjust the injection pressure and injection duration of the first hydrogen injector and the second hydrogen injector so that the hydrogen injection amount of the first hydrogen injector is greater than or equal to 70% of the hydrogen internal combustion engine cycle hydrogen injection amount;

[0013] Under the premixed combustion condition, adjust the injection pressure and injection duration of the first hydrogen injector and the second hydrogen injector so that the hydrogen injection amount of the first hydrogen injector is less than 30% of the hydrogen internal combustion engine cycle hydrogen injection amount;

[0014] Under the mixed combustion condition, adjust the injection pressure and injection duration of the first hydrogen injector and the second hydrogen injector so that the hydrogen injection amount of the first hydrogen injector and the hydrogen injection amount of the second hydrogen injector each account for 50% of the hydrogen internal combustion engine cycle hydrogen injection amount.

[0015] As an alternative technical solution of the hydrogen internal combustion engine control method, the rotational speed of the hydrogen internal combustion engine is n, with the unit of r / min. The diffusion combustion condition satisfies: n min < n < n min + 25% (n max - n min ), and the load rate of the hydrogen internal combustion engine is less than 30%. Among them, n minis the minimum idle speed of the hydrogen internal combustion engine, n max is the maximum idle speed of the hydrogen internal combustion engine.

[0016] As an alternative technical solution of the hydrogen internal combustion engine control method, the premixed combustion condition satisfies: n min + 25% (n max - n min ) < n < n max , and the load rate of the hydrogen internal combustion engine is less than 30% or at any speed of the hydrogen internal combustion engine, the load rate of the hydrogen internal combustion engine is less than 70%.

[0017] As an alternative technical solution of the hydrogen internal combustion engine control method, the hybrid combustion condition satisfies: at any speed of the hydrogen internal combustion engine, the load rate of the hydrogen internal combustion engine is greater than 70%.

[0018] The beneficial effects of the present invention are as follows:

[0019] The present invention provides a hydrogen internal combustion engine jet ignition system, which includes a hydrogen internal combustion engine main body, a pre-combustion chamber, a spark plug, a first hydrogen injector and a second hydrogen injector. Among them, the hydrogen internal combustion engine main body has a main combustion chamber; the pre-combustion chamber has a pre-combustion cavity and an acceleration cavity that communicate with each other. By using the hydrogen internal combustion engine jet ignition system of the present invention, hydrogen fuel is sprayed into the pre-combustion cavity through the first hydrogen injector, and after being fully mixed with the fresh air pressed in during the compression process, it is ignited by the spark plug, forming a diffusible flame front in the pre-combustion cavity. The expanded high-temperature flame is continuously accelerated through the acceleration cavity and finally sprayed into the main combustion chamber, forming a fast jet flame source to ignite the hydrogen-air mixture in the main combustion chamber, thereby realizing stable and reliable ignition of the hydrogen internal combustion engine. With such a setting, the flame speed from the pre-combustion cavity into the main combustion chamber is increased, ensuring stable and reliable ignition of the hydrogen internal combustion engine, and effectively solving the problem of unstable ignition existing in the prior art when jet ignition is carried out through the pre-combustion chamber. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the hydrogen internal combustion engine jet ignition system in an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of the pre-combustion chamber in an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the hydrogen internal combustion engine control method in another embodiment of the present invention.

[0023] In the figure:

[0024] 1. Hydrogen internal combustion engine main body; 11. Main combustion chamber; 12. Cylinder head; 13. Cylinder liner; 14. Concave piston crown

[0025] 2. Pre-combustion chamber; 21. Pre-combustion cavity; 22. Acceleration cavity; 221. Conical section; 222. Connecting section; 23. Jet hole

[0026] 3. Spark plug

[0027] 4. First hydrogen injector

[0028] 5. Second hydrogen injector

[0029] 6. Intake valve

[0030] 7. Exhaust valve Detailed implementation manners

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0035] As Figures 1 to 2 shown, this embodiment provides a hydrogen internal combustion engine jet ignition system, which includes a hydrogen internal combustion engine main body 1, a pre-combustion chamber 2, a spark plug 3, a first hydrogen injector 4, and a second hydrogen injector 5. Among them, the hydrogen internal combustion engine main body 1 has a main combustion chamber 11; the pre-combustion chamber 2 is arranged on the hydrogen internal combustion engine main body 1 and is located at the top of the main combustion chamber 11. The pre-combustion chamber 2 has a pre-combustion chamber 21 and an acceleration chamber 22 that communicate with each other. The acceleration chamber 22 is in communication with the main combustion chamber 11, and the acceleration chamber 22 can accelerate the flame in the pre-combustion chamber 21 to spread to the main combustion chamber 11; the spark plug 3 is arranged at the top of the pre-combustion chamber 2 and is in communication with the pre-combustion chamber 21; the first hydrogen injector 4 is arranged on the pre-combustion chamber 2 and is in communication with the pre-combustion chamber 21, and the first hydrogen injector 4 can inject hydrogen into the pre-combustion chamber 21; the second hydrogen injector 5 is arranged on the hydrogen internal combustion engine main body 1 and is in communication with the main combustion chamber 11, and the second hydrogen injector 5 can inject hydrogen into the main combustion chamber 11.

[0036] Using the hydrogen internal combustion engine jet ignition system of the present invention, hydrogen fuel is sprayed into the pre-combustion chamber 21 through the first hydrogen injector 4, and after being fully mixed with the fresh air pressed in during the compression process, it is ignited by the spark plug 3. A diffusible flame front is formed in the pre-combustion chamber 21. The expanding high-temperature flame is continuously accelerated through the acceleration chamber 22 and finally sprayed into the main combustion chamber 11 to form a fast jet flame source, which ignites the hydrogen-air mixture in the main combustion chamber 11, thereby realizing stable and reliable ignition of the hydrogen internal combustion engine. With such a setting, the flame speed entering from the pre-combustion chamber 21 into the main combustion chamber 11 is increased, ensuring stable and reliable ignition of the hydrogen internal combustion engine, and effectively solving the problem of unstable ignition existing in the prior art when jet ignition is carried out through a pre-combustion chamber.

[0037] In some embodiments, in order to improve the acceleration effect of the acceleration chamber 22, the acceleration chamber 22 includes a tapered section 221 and a connecting section 222. Among them, the large-size end of the tapered section 221 is in communication with the pre-combustion chamber 21, the small-size end of the tapered section 221 is in communication with the connecting section 222, and the connecting section 222 is in communication with the main combustion chamber 11. With such a setting, when entering from the tapered section 221 into the connecting section 222, since the cross-sectional area becomes smaller, the speed of the flame can be increased, thereby improving the acceleration effect of the acceleration chamber 22.

[0038] In this embodiment, the pre-combustion chamber 2 further includes a plurality of jet holes 23, which are arranged at intervals at the bottom of the pre-combustion chamber 2. At the same time, the communication section 222 is communicated with the main combustion chamber 11 through the jet holes 23, and the aperture of the jet holes 23 is smaller than the diameter of the communication section 222. With such a setting, after the flame enters the jet holes 23 from the communication section 222, the flame speed can be further accelerated, thereby improving the flame acceleration effect. Moreover, after entering the main combustion chamber 11 from the plurality of jet holes 23, a multi-point jet flame source can be formed, thereby realizing stable and reliable ignition.

[0039] It should be noted that hydrogen fuel is injected into the pre-combustion chamber 21 through the first hydrogen injector 4. After being fully mixed with the fresh air pressed in during the compression process, it is ignited by the spark plug 3 to form a diffusible flame front. The expanding high-temperature flame is continuously accelerated through the acceleration chamber 22 and the jet holes 23, and finally enters the main combustion chamber 11 through the jet holes 23 to form a multi-point jet flame source, igniting the hydrogen-air mixture in the main combustion chamber 11 and realizing stable and reliable ignition.

[0040] Specifically, the cavity shape of the pre-combustion chamber 21 includes, but is not limited to, a cylindrical shape or a spherical shape. With such a setting, the volume of the mixing and combustion area in the pre-combustion chamber 21 can be increased to a large extent, ensuring the full mixing of the active fuel and air.

[0041] Specifically, the hydrogen internal combustion engine jet ignition system further includes an intake valve 6 and an exhaust valve 7. Among them, both the intake valve 6 and the exhaust valve 7 are arranged on the hydrogen internal combustion engine main body 1 and are communicated with the main combustion chamber 11.

[0042] In this embodiment, the hydrogen internal combustion engine main body 1 includes a cylinder head 12, a cylinder liner 13, and a concave piston top 14. Among them, the cylinder head 12, the cylinder liner 13, and the concave piston top 14 enclose the main combustion chamber 11, and the pre-combustion chamber 2 and the second hydrogen injector 5 are both arranged on the cylinder head 12. Among them, the top surface of the concave piston top 14 needs to be determined according to the in-cylinder gas flow directions such as hydrogen and air.

[0043] Among them, hydrogen fuel is injected into the pre-combustion chamber 2 through the first hydrogen injector 4. After being fully mixed with air, it is ignited by the spark plug 3, and the formed high-speed flame is injected into the main combustion chamber 11. On the other hand, part of the hydrogen fuel enters the main combustion chamber 11 through the second hydrogen injector 5 and is ignited by the high-speed jet flame ejected from the pre-combustion chamber 2.

[0044] This embodiment also provides a control method for a hydrogen internal combustion engine, which is applied to the hydrogen internal combustion engine jet ignition system in the above solution. Among them, the hydrogen internal combustion engine has a diffusion combustion condition, a premixed combustion condition, and a mixed combustion condition. The control method for the hydrogen internal combustion engine includes: when in the diffusion combustion condition, the injection pressure and injection duration of the first hydrogen injector 4 and the second hydrogen injector 5 can be adjusted so that the hydrogen injection amount of the first hydrogen injector 4 is greater than or equal to 70% of the hydrogen internal combustion engine cycle hydrogen injection amount, thereby ensuring that the combustion in the main combustion chamber 11 is mainly based on the hydrogen injection amount of the pre-combustion chamber 2, thus ensuring the stable ignition and rapid combustion of the hydrogen internal combustion engine; similarly, in the premixed combustion condition, the injection pressure and injection duration of the first hydrogen injector 4 and the second hydrogen injector 5 are adjusted so that the hydrogen injection amount of the first hydrogen injector 4 is less than 30% of the hydrogen internal combustion engine cycle hydrogen injection amount, and the remaining hydrogen is injected into the main combustion chamber 11 through the second hydrogen injector 5. At this time, the combustion process in the main combustion chamber 11 is mainly controlled by premixed combustion; similarly, in the mixed combustion condition, the injection pressure and injection duration of the first hydrogen injector 4 and the second hydrogen injector 5 are adjusted so that the hydrogen injection amounts of the first hydrogen injector 4 and the second hydrogen injector 5 each account for 50% of the hydrogen internal combustion engine cycle hydrogen injection amount. At this time, the combustion process in the main combustion chamber 11 is controlled by both premixed combustion and diffusion combustion. By using the above control method for the hydrogen internal combustion engine, it is possible to ensure the stable and rapid ignition of the hydrogen internal combustion engine under all working conditions.

[0045] Specifically, as Figure 3 shown, region I is the diffusion combustion condition, region II is the premixed combustion condition, and region III is the mixed combustion condition. The rotational speed of the hydrogen internal combustion engine is n, with the unit of r / min. The diffusion combustion condition satisfies: n min < n < n min + 25% (n max - n min ), and the load rate of the hydrogen internal combustion engine is less than 30%. Among them, n min is the minimum idle speed of the hydrogen internal combustion engine, and n max is the maximum idle speed of the hydrogen internal combustion engine. Similarly, the premixed combustion condition satisfies: n min + 25% (n max - n min ) < n < n max , and the load rate of the hydrogen internal combustion engine is less than 30% or at any rotational speed of the hydrogen internal combustion engine, the load rate of the hydrogen internal combustion engine is less than 70%; and, the mixed combustion condition satisfies: at any rotational speed of the hydrogen internal combustion engine, the load rate of the hydrogen internal combustion engine is greater than 70%.

[0046] The advantages of the present invention are as follows:

[0047] The pre-chamber 2 of the present invention accelerates the flame propagation speed through the tapered nozzle-shaped acceleration chamber 22, increases the penetration distance of the jet flame in the pre-chamber 2, and solves the problems of stable ignition and rapid combustion in the hydrogen lean combustion mode. Moreover, the hydrogen internal combustion engine control method of the present invention provides a multi-mode switching method for a direct injection pre-chamber jet ignition hydrogen internal combustion engine, realizing efficient and stable combustion of the hydrogen internal combustion engine under wide operating conditions.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A hydrogen internal combustion engine jet ignition system, characterized in that, Comprising: A hydrogen internal combustion engine main body (1) having a main combustion chamber (11); A pre-combustion chamber (2) provided on the hydrogen internal combustion engine main body (1) and located at the top of the main combustion chamber (11). The pre-combustion chamber (2) has a pre-combustion cavity (21) and an acceleration cavity (22) that communicate with each other. The acceleration cavity (22) communicates with the main combustion chamber (11), and the acceleration cavity (22) can accelerate the propagation of the flame in the pre-combustion cavity (21) to the main combustion chamber (11); A spark plug (3) provided at the top of the pre-combustion chamber (2) and communicating with the pre-combustion cavity (21); A first hydrogen injector (4) provided on the pre-combustion chamber (2) and communicating with the pre-combustion cavity (21). The first hydrogen injector (4) can inject hydrogen into the pre-combustion cavity (21); A second hydrogen injector (5) provided on the hydrogen internal combustion engine main body (1) and communicating with the main combustion chamber (11). The second hydrogen injector (5) can inject hydrogen into the main combustion chamber (11).

2. The hydrogen internal combustion engine jet ignition system according to claim 1, characterized in that, The acceleration cavity (22) includes a tapered section (221) and a connecting section (222). The larger end of the tapered section (221) communicates with the pre-combustion cavity (21), the smaller end of the tapered section (221) communicates with the connecting section (222), and the connecting section (222) communicates with the main combustion chamber (11).

3. The hydrogen internal combustion engine jet ignition system according to claim 2, characterized in that, The pre-combustion chamber (2) further includes a plurality of jet holes (23). The plurality of jet holes (23) are arranged at intervals at the bottom of the pre-combustion chamber (2). The connecting section (222) communicates with the main combustion chamber (11) through the jet holes (23), and the aperture of the jet holes (23) is smaller than the diameter of the connecting section (222).

4. The hydrogen internal combustion engine jet ignition system according to claim 1, characterized in that, The cavity shape of the pre-combustion cavity (21) is cylindrical or spherical.

5. The hydrogen internal combustion engine jet ignition system according to claim 1, characterized in that The hydrogen internal combustion engine jet ignition system further includes an intake valve (6) and an exhaust valve (7). The intake valve (6) and the exhaust valve (7) are both provided on the hydrogen internal combustion engine main body (1) and communicate with the main combustion chamber (11).

6. The hydrogen internal combustion engine jet ignition system according to claim 1, characterized in that, The hydrogen internal combustion engine main body (1) includes a cylinder head (12), a cylinder liner (13), and a concave piston crown (14). The cylinder head (12), the cylinder liner (13), and the concave piston crown (14) enclose the main combustion chamber (11). The pre-combustion chamber (2) and the second hydrogen injector (5) are both provided on the cylinder head (12).

7. A control method for a hydrogen internal combustion engine, characterized in that Applied to the hydrogen internal combustion engine jet ignition system according to any one of claims 1-6, the hydrogen internal combustion engine has a diffusion combustion mode, a premixed combustion mode, and a mixed combustion mode. The hydrogen internal combustion engine control method includes: In the diffusion combustion mode, adjust the injection pressure and injection duration of the first hydrogen injector (4) and the second hydrogen injector (5) so that the hydrogen injection amount of the first hydrogen injector (4) is greater than or equal to 70% of the hydrogen internal combustion engine cycle hydrogen injection amount; Under the premixed combustion condition, adjust the injection pressure and injection duration of the first hydrogen injector (4) and the second hydrogen injector (5) so that the hydrogen injection amount of the first hydrogen injector (4) is less than 30% of the hydrogen injection amount per cycle of the hydrogen internal combustion engine; Under the hybrid combustion condition, adjust the injection pressure and injection duration of the first hydrogen injector (4) and the second hydrogen injector (5) so that the hydrogen injection amount of the first hydrogen injector (4) and the hydrogen injection amount of the second hydrogen injector (5) each account for 50% of the hydrogen injection amount per cycle of the hydrogen internal combustion engine.

8. The hydrogen internal combustion engine control method according to claim 7, characterized in that The rotational speed of the hydrogen internal combustion engine is n, with the unit of r / min. The diffusion combustion condition is satisfied: n min < n < n min + 25% (n max - n min ), and the load rate of the hydrogen internal combustion engine is less than 30%. Among them, n min is the minimum idle speed of the hydrogen internal combustion engine, and n max is the maximum idle speed of the hydrogen internal combustion engine.

9. The hydrogen internal combustion engine control method according to claim 8, characterized in that, The pre-mixed combustion condition is satisfied: n min + 25% (n max - n min ) < n < n max , and the load rate of the hydrogen internal combustion engine is less than 30% or at any speed of the hydrogen internal combustion engine, the load rate of the hydrogen internal combustion engine is less than 70%.

10. The hydrogen internal combustion engine control method according to claim 9, characterized in that, The hybrid combustion condition is satisfied: at any speed of the hydrogen internal combustion engine, the load rate of the hydrogen internal combustion engine is greater than 70%.

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