A new dual injection system for hydrogen internal combustion engine

Abstract

The application discloses a novel double-injection system for a hydrogen internal combustion engine and belongs to the technical field of internal combustion engine injection, and solves the technical problem that the fast combustion speed of hydrogen often leads to early combustion, knocking or backfire. The application comprises an internal combustion engine body, a water tank, a hydrogen tank and a hydrogen-water double nozzle, the hydrogen-water double nozzle is installed in the combustion chamber of the internal combustion engine body, the water tank is connected with the water inlet hole of the hydrogen-water double nozzle through a water pipe, the hydrogen tank is connected with the hydrogen inlet hole of the hydrogen-water double nozzle through a hydrogen pipe, the water pipe is provided with a water pipe electromagnetic valve, the hydrogen pipe is provided with a hydrogen pipe electromagnetic valve, and the controller of the internal combustion engine body determines the hydrogen injection amount and the water injection amount according to a hydrogen-water mixing amount model and controls the water pipe electromagnetic valve and the hydrogen pipe electromagnetic valve to work according to the hydrogen injection amount and the water injection amount. The hydrogen-water mixing can lower the ignition point of hydrogen, realize the effect of controlling the combustion temperature, lowering the emission, improving the combustion product, reducing the knocking, improving the thermal efficiency and reducing the noise.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of internal combustion engine injection technology, more particularly, it relates to a new type of hydrogen internal combustion engine dual injection system. BACKGROUND

[0002] Hydrogen compression ignition internal combustion engine is an engine that uses hydrogen as fuel, which adopts compression ignition method instead of traditional spark ignition. In the compression ignition internal combustion engine, hydrogen fuel is compressed and ignited under high pressure and high temperature, instead of relying on the electric spark generated by the spark plug to ignite the fuel.

[0003] The traditional in-cylinder direct injection hydrogen internal combustion engine often causes early combustion / detonation and backfire during operation due to the fast burning speed of hydrogen, which limits the performance of the engine and reduces the energy utilization rate, affecting the normal work and service life of the engine. The causes of this problem are diverse, including single injection method and poor formation of mixture, etc. These factors directly affect the complete combustion of hydrogen, and further limit the further improvement of the performance of hydrogen engine. SUMMARY

[0004] The technical problem to be solved by the present application is to solve the above-mentioned shortcomings of the prior art, and the purpose of the present application is to provide a new type of hydrogen internal combustion engine dual injection system to solve the phenomenon of early combustion / detonation and backfire caused by the fast burning speed of hydrogen.

[0005] The technical scheme of the present application is: a new type of hydrogen internal combustion engine dual injection system, comprising an internal combustion engine body, a water tank, a hydrogen tank and a hydrogen and water dual nozzle, the hydrogen and water dual nozzle is installed in the combustion chamber of the internal combustion engine body, the water tank is connected to the water inlet hole of the hydrogen and water dual nozzle through a water pipe, the hydrogen tank is connected to the hydrogen inlet hole of the hydrogen and water dual nozzle through a hydrogen pipe, a water pipe solenoid valve is arranged between the water inlet hole of the hydrogen and water dual nozzle and the water pipe, a hydrogen pipe solenoid valve is arranged between the hydrogen inlet hole of the hydrogen and water dual nozzle and the hydrogen pipe, and the controller of the internal combustion engine body determines the hydrogen injection amount and the water injection amount according to a hydrogen and water mixture amount model, and controls the water pipe solenoid valve and the hydrogen pipe solenoid valve to work according to the hydrogen injection amount and the water injection amount.

[0006] The hydrogen and water mixture amount model comprises:

[0007] cylinder pressure equation,

[0008]

[0009] Wherein, P0 is atmospheric pressure, BMEP is brake mean effective pressure, k is a constant depending on the geometry and operating conditions of the engine, L is the engine load factor, 0≤L≤1.

[0010] Gas injection amount equation,

[0011]

[0012] Wherein, A is a constant depending on engine geometry and operating conditions;

[0013] Water injection amount equation,

[0014]

[0015] As a further improvement, k=0.5, A=0.1, P0=101325Pa.

[0016] Further, the water pipe is sequentially provided with a water filter, a water pump and a water flow meter, and the controller is electrically connected with the water pump and the water flow meter.

[0017] Further, the hydrogen pipe is sequentially provided with a pressure reducing valve and a hydrogen flow meter, and the controller is electrically connected with the hydrogen flow meter.

[0018] Further, a condensed water recovery device connected with the exhaust pipe of the internal combustion engine body is further included, and the condensed water recovery device comprises a vertically arranged shell, a gas outlet is arranged at the top of the shell, and a water collecting cavity is arranged at the bottom of the shell, and the bottom of the water collecting cavity is connected with the water tank through a recovery pipe.

[0019] Further, the two side inner walls in the shell are respectively provided with upper and lower staggered baffles, the baffles extend downwardly and the upper baffles extend above the lower baffles.

[0020] Further, the outer wall of the shell is provided with heat dissipation fins.

[0021] Further, the hydrogen inlet hole is located in the middle of the hydrogen and water double nozzle, the number of water inlet holes is greater than or equal to 2, and the water inlet holes are uniformly arranged around the hydrogen inlet hole.

[0022] Further, the number of water inlet holes is 4.

[0023] Further, the bottom of the hydrogen and water double nozzle is provided with a mixing cavity, the top of the mixing cavity is communicated with the water inlet hole and the hydrogen inlet hole, and the bottom of the mixing cavity is provided with an ejection hole.

[0024] Beneficial effects

[0025] Compared with the prior art, the present application has the advantages of:

[0026] 1. Dilution effect: the addition of water vapor dilutes the hydrogen concentration, so that the ignition point of the mixed gas is reduced. This is because the combustion reaction of hydrogen requires a certain concentration to ignite, and after dilution, the condition to ignite is easier to achieve.

[0027] 2. Cooling effect: Water vapor absorbs heat during the combustion process, which can reduce the temperature of the combustion area, thereby reducing the ignition point of the mixture.

[0028] 3. Chemical effect: Water vapor can be decomposed into hydrogen and oxygen at high temperatures, and these decomposition products can participate in the combustion reaction, thereby reducing the overall ignition point.

[0029] 4. The double injection system sprays water into the cylinder of the engine, avoiding the possibility of premature ignition, and the addition of water vapor can achieve the effects of controlling combustion temperature, reducing emissions, improving combustion products, reducing knocking, improving thermal efficiency and reducing noise. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 is a structural schematic diagram of the present application;

[0031] Fig. 2 is a sectional view of the hydrogen and water double nozzle in the present application;

[0032] Fig. 3 is a top structural schematic diagram of the hydrogen and water double nozzle in the present application;

[0033] Fig. 4 is a structural schematic diagram of the condensate recovery device in the present application.

[0034] Wherein: 1-internal combustion engine body, 2-water tank, 3-hydrogen tank, 4-hydrogen and water double nozzle, 5-water pipe, 6-water inlet hole, 7-hydrogen pipe, 8-hydrogen inlet hole, 9-water pipe electromagnetic valve, 10-hydrogen pipe electromagnetic valve, 11-water filter, 12-water pump, 13-water flow meter, 14-pressure reducing valve, 15-hydrogen flow meter, 16-exhaust pipe, 17-condensate recovery device, 18-housing, 19-air outlet, 20-water collection cavity, 21-recovery pipe, 22-flow baffle, 23-radiating fins, 24-mixing cavity, 25-ejection hole. DETAILED DESCRIPTION

[0035] The present application will be further described below in conjunction with specific embodiments in the drawings.

[0036] Reference Figs. 1-4The utility model provides a new type of double injection system of hydrogen internal combustion engine, including internal combustion engine body 1, still including water tank 2, hydrogen tank 3, hydrogen water double nozzle 4, hydrogen water double nozzle 4 is installed in the combustion chamber of internal combustion engine body 1, water tank 2 is connected the water inlet hole 6 of hydrogen water double nozzle 4 through water pipe 5, hydrogen tank 3 is connected the hydrogen inlet hole 8 of hydrogen water double nozzle 4 through hydrogen pipe 7, and water pipe solenoid valve 9 is arranged between the water inlet hole 6 of hydrogen water double nozzle 4 and water pipe 5, hydrogen pipe solenoid valve 10 is arranged between the hydrogen inlet hole 8 of hydrogen water double nozzle 4 and hydrogen pipe 7, and the controller of internal combustion engine body 1 determines hydrogen injection quantity, water injection quantity according to hydrogen and water mixing quantity model, and controls water pipe solenoid valve 9, hydrogen pipe solenoid valve 10 to work according to hydrogen injection quantity, water injection quantity.

[0037] Hydrogen and water mixing quantity model includes:

[0038] Cylinder pressure equation,

[0039]

[0040] Where P0 is atmospheric pressure, BMEP is brake mean effective pressure, k is a constant depending on engine geometry and operating conditions, L is engine load factor, 0≤L≤1;

[0041] Gas injection quantity equation,

[0042]

[0043] Where A is a constant depending on engine geometry and operating conditions;

[0044] Water injection quantity equation,

[0045]

[0046] That is, the hydrogen and water mixing quantity model can determine the fuel injection quantity and water injection quantity of hydrogen internal combustion engine according to cylinder pressure and engine load, which provides a reference, and the best parameters are sought in continuous verification. The ratio of hydrogen and water can be selectively used under different working conditions to improve combustion efficiency. The application of hydrogen reduces emission pollutants, and the application of water reduces cylinder combustion temperature and improves combustion efficiency.

[0047] Preferably, k=0.5, A=0.1, P0=101325Pa.

[0048] Specifically, water pipe 5 is sequentially provided with water filter 11, water pump 12 and water flow meter 13, and the controller is electrically connected with water pump 12 and water flow meter 13. Hydrogen pipe 7 is sequentially provided with pressure reducing valve 14 and hydrogen flow meter 15, and the controller is electrically connected with hydrogen flow meter 15.

[0049] The system further comprises a condensed water recovery device 17 connected to the exhaust pipe 16 of the internal combustion engine body 1, the condensed water recovery device 17 comprising a vertically arranged shell 18, the top of the shell 18 being provided with an air outlet 19, and the bottom of the shell 18 being provided with a water collecting cavity 20, the bottom of the water collecting cavity 20 being connected to the water tank 2 through a recovery pipe 21. The two side walls in the shell 18 are respectively provided with flow baffles 22 arranged in an up-and-down staggered manner, the flow baffles 22 extending downwardly in an inclined manner, and the upper flow baffles 22 extending above the lower flow baffles 22. The outer wall of the shell 18 is provided with heat dissipation fins 23. The water vapor generated by combustion is condensed and recovered through the condensed water recovery device 17, so that the frequency of adding water to the water tank 2 can be reduced, and the user experience effect can be improved.

[0050] The hydrogen inlet hole 8 is located in the middle of the hydrogen and water dual nozzle 4, the number of the water inlet hole 6 is greater than or equal to 2, and the water inlet hole 6 is uniformly arranged around the hydrogen inlet hole 8. Preferably, the number of the water inlet hole 6 is equal to 4. Due to the decrease of the hole diameter and the invariable pressure, the temperature of the hydrogen entering the nozzle will increase, and the temperature of the nozzle will also increase. There are four water paths in the nozzle for cooling the nozzle.

[0051] The bottom of the hydrogen and water dual nozzle 4 is provided with a mixing cavity 24, the top of the mixing cavity 24 is communicated with the water inlet hole 6 and the hydrogen inlet hole 8, and the hydrogen and water are premixed in the mixing cavity 24. The bottom of the mixing cavity 24 is provided with a spray hole 25. The spray hole 25 has a plurality of holes, one of which is arranged on the bottom wall of the mixing cavity 24, and the others are uniformly arranged on the side wall of the mixing cavity 24, so that the mixed gas can quickly fill the combustion chamber after being sprayed, and the hydrogen and water in the mixed gas are uniformly mixed.

[0052] Compared with the traditional hydrogen direct injection fuel injection system, the present application is more environmentally friendly and efficient. By using hydrogen and water to mix in the cylinder, the emission can be significantly reduced, the combustion efficiency can be improved, and the modern environmental protection and energy saving requirements can be met.

[0053] The present application solves the emission and efficiency problems of the traditional fuel injection system, and simultaneously utilizes the advantages of hydrogen and water to realize clean and efficient hybrid power, and is suitable for hydrogen fuel engines of various vehicles and equipment.

[0054] The above is only a preferred embodiment of the present application, and it should be pointed out that those skilled in the art can make several modifications and improvements without departing from the structure of the present application, which will not affect the effect of the present application and the practicability of the patent.

Claims

1. A novel dual injection system for hydrogen internal combustion engine comprising an internal combustion engine body (1), characterized in that, It also includes a water tank (2), a hydrogen tank (3), a hydrogen and water double nozzle (4) installed in the combustion chamber of the internal combustion engine body (1), the water tank (2) is connected to the water inlet hole (6) of the hydrogen and water double nozzle (4) through the water pipe (5), the hydrogen tank (3) is connected to the hydrogen inlet hole (8) of the hydrogen and water double nozzle (4) through the hydrogen pipe (7), the water pipe electromagnetic valve (9) is arranged between the water inlet hole (6) of the hydrogen and water double nozzle (4) and the water pipe (5), the hydrogen pipe electromagnetic valve (10) is arranged between the hydrogen inlet hole (8) of the hydrogen and water double nozzle (4) and the hydrogen pipe (7), the controller of the internal combustion engine body (1) determines the hydrogen injection amount and the water injection amount according to the hydrogen and water mixing amount model, and controls the water pipe electromagnetic valve (9) and the hydrogen pipe electromagnetic valve (10) to work according to the hydrogen injection amount and the water injection amount; The hydrogen and water mixing amount model comprises: Cylinder pressure equation, Wherein, P0 is atmospheric pressure, BMEP is brake mean effective pressure, k is a constant depending on engine geometry and operating conditions, L is engine load factor, 0≤L≤1; Gas injection amount equation, Wherein, A is a constant depending on engine geometry and operating conditions; Water injection amount equation, 2. A novel dual injection system for hydrogen internal combustion engine as claimed in claim 1, wherein K=0.5, A=0.1, P0=101325Pa.

3. A novel dual injection system for hydrogen internal combustion engine as claimed in claim 1, wherein, The water pipe (5) is sequentially provided with a water filter (11), a water pump (12) and a water flow meter (13), and the controller is electrically connected with the water pump (12) and the water flow meter (13).

4. A dual injection system for a novel hydrogen internal combustion engine as claimed in claim 1, wherein The hydrogen pipe (7) is sequentially provided with a pressure reducing valve (14) and a hydrogen flow meter (15), and the controller is electrically connected with the hydrogen flow meter (15).

5. A dual injection system for a novel hydrogen internal combustion engine as claimed in claim 1, wherein It also includes a condensate water recovery device (17) connected to the exhaust pipe (16) of the internal combustion engine body (1), the condensate water recovery device (17) comprises a vertically arranged shell (18), the top of the shell (18) is provided with an air outlet (19), the bottom of the shell (18) is provided with a water collecting cavity (20), and the bottom of the water collecting cavity (20) is connected to the water tank (2) through a recovery pipe (21).

6. A dual injection system for a novel hydrogen internal combustion engine as claimed in claim 5, wherein The inner walls on both sides in the shell (18) are respectively provided with upper and lower staggered baffles (22), the baffles (22) extend downwardly, and the upper baffles (22) extend above the lower baffles (22).

7. A dual injection system for a novel hydrogen internal combustion engine as claimed in claim 5, wherein The outer wall of the shell (18) is provided with a heat dissipation fin (23).

8. A dual injection system for a novel hydrogen internal combustion engine according to any one of claims 1 to 7, characterized in that, The hydrogen inlet hole (8) is located in the middle of the hydrogen and water double nozzle (4), the number of the water inlet holes (6) is greater than or equal to 2, and the water inlet holes (6) are uniformly arranged around the hydrogen inlet hole (8).

9. A novel dual injection system for hydrogen internal combustion engine as claimed in claim 8, wherein The number of the water inlet holes (6) is 4.

10. A dual injection system for a novel hydrogen internal combustion engine as claimed in claim 8, wherein The bottom of the hydrogen and water double nozzle (4) is provided with a mixing cavity (24), the top of the mixing cavity (24) is communicated with the water inlet hole (6) and the hydrogen inlet hole (8), and the bottom of the mixing cavity (24) is provided with a spray hole (25).

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