Turbulence jet ignition assisted methanol inlet jet engine cold start system and working method thereof
By optimizing the pre-combustion chamber structure and pilot fuel supply, and combining it with an online methanol-to-hydrogen device, the turbulent jet ignition technology was successfully applied to achieve efficient cold start and stable combustion in methanol engines. This solved the problems of low-temperature atomization of methanol fuel and high ignition energy requirements, reduced system complexity and cost, and improved the engine's low-carbon performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HARBIN ENG UNIV
- Filing Date
- 2026-02-03
- Publication Date
- 2026-04-28
AI Technical Summary
Methanol fuel is difficult to atomize and evaporate at low temperatures and has high ignition energy requirements, making it difficult to start the engine in cold conditions. Existing turbulent jet ignition systems are not adaptable enough and are costly, and cannot balance cold start performance with low carbon advantages.
By employing turbulent jet ignition technology, optimizing the pre-combustion chamber structure and supplying ignition fuel, and combining it with an online methanol-to-hydrogen device, a highly efficient multi-point ignition system is formed, enabling reliable ignition of methanol fuel. The system has a simple structure and requires no external hydrogen cylinders or gasoline assistance.
It achieves reliable cold start and efficient combustion of methanol engines, reduces system complexity and cost, improves fuel adaptability and engine thermal efficiency, and meets low carbon emission requirements under all operating conditions.
Smart Images
Figure CN121932298A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of power and energy engineering technology, and in particular relates to a cold start system for a methanol intake manifold injection engine with turbulent jet ignition assistance and its working method. Background Technology
[0002] In recent years, the power sector has been accelerating its transition to clean and low-carbon fuels, with increasing pressure on pollutant control for diesel and traditional gasoline engines. Finding efficient alternative fuels and supporting technologies has become a core task for the industry. Methanol, with its unique advantages, has emerged as a potential clean fuel. Its oxygen content reaches 50%, resulting in more complete in-cylinder combustion and significantly reducing PM and CO emissions. Simultaneously, its high latent heat of vaporization can lower the peak combustion temperature, thus suppressing NO emissions at the source. X It is generated in a manner that allows it to meet standards without post-processing under certain operating conditions. In particular, green methanol can achieve a closed-loop carbon cycle throughout its entire life cycle, providing a pathway for carbon neutrality in power systems and showing broad application prospects in commercial vehicles, marine power, and other fields.
[0003] However, methanol's physicochemical properties present a significant bottleneck. Its low saturated vapor pressure and poor low-temperature fluidity make it difficult to atomize and evaporate into a combustible mixture below 5°C. Furthermore, its high ignition energy requirement leads to difficulties in engine cold starts, which has become a core obstacle to its industrialization. Traditional cold-start solutions are generally limited by the need to introduce highly volatile combustion-supporting fuels, necessitating a dual-fuel system. This contradicts the original design intent of single-fuel systems and carries the risk of fuel mixing. Additionally, intake heating methods are inefficient, slow-responding, and consume extra energy. Adding small amounts of low-temperature reactive combustion-supporting chemicals to methanol not only increases costs but may also cause component corrosion and increase the difficulty of subsequent management, making it difficult to achieve a balance between system simplicity, clean emissions, and cost control.
[0004] Turbulent jet ignition technology offers a new direction, amplifying ignition energy through a pre-combustion chamber at the top of the combustion chamber to achieve efficient multi-point ignition. This matches the specific ignition requirements of methanol without requiring additional fuel or significant modifications, and is expected to balance cold-start performance with low-carbon advantages, making it a hot research topic. However, existing systems lack adaptability, are mostly based on modifications to gasoline engines, and require gasoline injection for ignition in the pre-combustion chamber, leading to complex structures, higher failure rates, and increased costs. The coexistence of dual fuels not only contradicts the application goals of methanol but also easily causes combustion fluctuations, undermining its low-carbon advantages and failing to unleash its environmental potential.
[0005] Therefore, it is urgent to customize the TJI system by utilizing the characteristics of methanol. By optimizing the pre-combustion chamber structure, innovating the pilot fuel supply, and improving the jet efficiency, a truly methanol-fuel-compatible ignition system can be built. This will be the key to breaking through the industrialization bottleneck of methanol engines and an important support for promoting the low-carbon transformation of the power sector. It has urgent engineering value and far-reaching environmental significance. Summary of the Invention
[0006] In view of this, in order to solve the above problems, the present invention proposes a turbulent jet ignition-assisted methanol intake manifold injection engine cold start system and its working method.
[0007] To achieve the above objectives, the present invention adopts the following technical solution: A turbulent jet ignition-assisted methanol inlet injection engine cold start system includes: The cylinder has a main combustion chamber inside and an intake manifold above it. Methanol injector, the methanol injector is located in the intake manifold; The pre-combustion structure includes a housing and a spark plug and a jet valve both disposed within the housing. The housing is located above the main combustion chamber, and a pre-combustion chamber is provided inside the housing. The spark plug and the jet valve are both located above the pre-combustion chamber. The lower end of the housing is provided with a jet channel and a jet hole. One end of the jet hole is connected to the pre-combustion chamber through the jet channel, and the other end is connected to the main combustion chamber. The mixture passage and flow control valve are designed with the air inlet end connected to the air intake and the air outlet end connected to the pre-combustion chamber. The air inlet end of the mixture passage is located between the methanol injector and the main combustion chamber, and the flow control valve is installed on the mixture passage. The high-pressure methanol oil circuit and the online methanol hydrogen production unit are used to supply methanol to the methanol injectors and the online methanol hydrogen production unit, and the online methanol hydrogen production unit is used to supply hydrogen to the jet valve.
[0008] As a preferred embodiment of the aforementioned turbulent jet ignition-assisted methanol intake port injection engine cold start system, the jet channel is tapered, with the size of the jet channel gradually decreasing from the pre-combustion chamber towards the jet orifice.
[0009] As a preferred embodiment of the aforementioned turbulent jet ignition-assisted methanol intake manifold injection engine cold start system, the number of jet holes is multiple, and the extension directions of the multiple jet holes are all different.
[0010] As a preferred embodiment of the aforementioned turbulent jet ignition-assisted methanol inlet injection engine cold start system, the turbulent jet ignition-assisted methanol inlet injection engine cold start system further includes an electronic control unit, which is used to control the online methanol hydrogen production device and the flow control valve.
[0011] As a preferred embodiment of the aforementioned turbulent jet ignition-assisted methanol intake manifold injection engine cold start system, the housing is located directly above the main combustion chamber.
[0012] As a preferred embodiment of the aforementioned turbulent jet ignition-assisted methanol intake port injection engine cold start system, the cylinder is also provided with an exhaust port.
[0013] This invention also provides a method for operating a turbulent jet ignition-assisted methanol inlet injection engine cold start system, which employs the aforementioned turbulent jet ignition-assisted methanol inlet injection engine cold start system, comprising: During engine start-up, the flow control valve is closed, the online methanol-to-hydrogen device starts and converts methanol into hydrogen to supply the jet valve. The jet valve injects hydrogen into the pre-combustion chamber, and at the same time the spark plug discharges immediately. The hydrogen burns instantly and forms a first high-pressure flame in the pre-combustion chamber. The first high-pressure flame is accelerated through the jet channel and then ejected from the jet hole to form a first turbulent jet flame, which enters the central area of the main combustion chamber. The methanol injected by the methanol injector into the intake manifold mixes with air to form a methanol-hydrogen mixture. The methanol-hydrogen mixture enters the main combustion chamber and is ignited by the first turbulent jet flame. During the engine power increase phase, the flow control valve opens, and the methanol injected by the methanol injector into the intake manifold mixes with air to form a methanol-hydrogen mixture. Part of the methanol-air mixture in the intake manifold enters the pre-combustion chamber through the mixture channel, while the other part enters the main combustion chamber. The online methanol-hydrogen generator supplies hydrogen to the jet valve, which injects hydrogen into the pre-combustion chamber, forming a methanol-hydrogen-air mixture. The spark plug discharges and ignites the methanol-hydrogen-air mixture in the pre-combustion chamber, forming a second high-pressure flame. The second high-pressure flame is accelerated through the jet channel and ejected from the jet orifice, forming a second turbulent jet flame, which enters the central region of the main combustion chamber. The second turbulent jet flame ignites the methanol-air mixture in the main combustion chamber. When the engine is running at rated power, the flow control valve is fully open, the methanol-to-hydrogen device is closed, and the methanol injector injects methanol into the intake manifold to mix with air to form a methanol-hydrogen mixture. Part of the methanol-air mixture in the intake manifold enters the pre-combustion chamber through the mixture passage, and the other part enters the main combustion chamber. The spark plug discharges and ignites the methanol-air mixture in the pre-combustion chamber to form a third high-pressure flame. The third high-pressure flame is accelerated through the jet passage and ejected from the jet hole to form a third turbulent jet flame, which enters the central area of the main combustion chamber and ignites the methanol-air mixture in the main combustion chamber.
[0014] As a preferred embodiment of the working method of the above-mentioned turbulent jet ignition-assisted methanol inlet injection engine cold start system: During the engine power increase phase, as the engine power increases, the opening of the flow control valve gradually increases, and the flow rate of the methanol-air mixture entering the pre-combustion chamber through the mixture passage gradually increases. At the same time, the power of the online methanol hydrogen production unit also decreases accordingly, gradually increasing the proportion of methanol fuel in the pre-combustion chamber.
[0015] Compared with the prior art, the beneficial effects of the turbulent jet ignition-assisted methanol inlet injection engine cold start system and its working method provided by the present invention are as follows: This invention provides a turbulent jet ignition-assisted methanol intake port injection engine cold start system and its operating method. In this system, when the engine starts, the methanol injector first injects methanol fuel, the flow control valve closes, the mixing channel is cut off by the flow control valve, and the jet valve separately injects hydrogen into the pre-combustion chamber. The spark plug breaks down the gap, and the hydrogen, under the amplification effect of the jet channel and jet orifice, forms a high-speed turbulent flame that instantly ignites the methanol fuel in the main combustion chamber, solving the engine cold start problem. As the engine power gradually increases, the flow control valve gradually opens, and the methanol-air mixture is introduced into the pre-combustion chamber. Simultaneously, the hydrogen injection volume of the jet valve decreases, and the hydrogen-to-methanol ratio transitions continuously. When the engine enters its rated operating condition, the online methanol-hydrogen production unit goes into hibernation, the jet valve is closed, the flow control valve is fully open, and the fuel in the pre-combustion chamber is supplied entirely by the methanol-air mixture. After the spark plug ignites the fuel, the high-pressure flame is accelerated through the jet channel and injected into the main combustion chamber in the form of multiple high-temperature methanol turbulent jets through the jet orifice, reliably triggering the rapid combustion of pure methanol and ensuring stable operation of the engine under high load.
[0016] This turbulent jet ignition-assisted methanol intake port injection engine cold start system can simultaneously meet the main injection and ignition requirements of methanol fuel, eliminating the need for external hydrogen tanks, gasoline auxiliary injection, and redundant pipelines. It features a minimalist structure, significantly reduced costs, and simultaneously improves fuel adaptability and engine thermal efficiency under all operating conditions. Attached Figure Description
[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of the turbulent jet ignition-assisted methanol intake manifold injection engine cold start system provided in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the turbulent jet ignition-assisted methanol inlet injection engine cold start system in the cold start stage according to a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the turbulent jet ignition-assisted methanol intake manifold injection engine cold start system during the engine power increase stage, provided in a specific embodiment of the present invention. Figure 4 This is a schematic diagram of the turbulent jet ignition-assisted methanol intake manifold injection engine cold start system provided in a specific embodiment of the present invention during the engine's rated power operation phase; Figure 5This is a schematic diagram of the pre-combustion structure of the turbulent jet ignition-assisted methanol intake manifold injection engine cold start system provided in a specific embodiment of the present invention.
[0018] In the picture: 1. High-pressure methanol fuel line; 2. Flow control valve; 3. Mixing channel; 4. Methanol injector; 5. Intake duct; 6. Main combustion chamber; 7. Online methanol hydrogen production unit; 8. Housing; 9. Injection valve; 10. Spark plug; 11. Pre-combustion chamber; 12. Jet orifice. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.
[0020] See Figure 1-5 This invention provides a turbulent jet ignition-assisted methanol intake manifold injection engine cold start system and its operating method. The system includes: a cylinder, a methanol injector 4, a pre-combustion structure, a mixture passage, a flow control valve 2, a high-pressure methanol fuel line 1, and a methanol online hydrogen production device 7. The cylinder contains a main combustion chamber 6, and an intake manifold 5 is located above the cylinder. The methanol injector 4 is disposed within the intake manifold 5. The pre-combustion structure includes a housing 8 and a spark plug 10 and a jet valve 9, both disposed within the housing 8. The housing 8 is located above the main combustion chamber 6, and a pre-combustion structure is provided within the housing 8. Combustion chamber 11, spark plug 10, and jet valve 9 are all located above pre-combustion chamber 11. The lower end of housing 8 is provided with jet channel and jet hole 12. One end of jet hole 12 is connected to pre-combustion chamber 11 through jet channel, and the other end is connected to main combustion chamber 6. The inlet end of mixture channel is connected to inlet duct 5, and the outlet end is connected to pre-combustion chamber 11. The inlet end of mixture channel 3 is located between methanol injector 4 and main combustion chamber 6. Flow control valve 2 is set on mixture channel. High-pressure methanol oil circuit 1 is used to supply methanol to methanol injector 4 and methanol online hydrogen production device 7. Methanol online hydrogen production device 7 is used to supply hydrogen to jet valve 9.
[0021] In this turbulent jet ignition-assisted methanol intake port injection engine cold start system, the methanol injector 4 is located at the intake port 5, where methanol and air are premixed to form a methanol-air mixture. A flow control valve 2 is installed on the mixing channel 3, which is connected to the intake port 5 and the pre-combustion chamber 11 at both ends, respectively, to deliver the methanol-air mixture into the pre-combustion chamber 11. Both the methanol injector 4 and the online methanol hydrogen generator 7 are connected to the high-pressure methanol fuel line 1, which supplies methanol to both the methanol injector 4 and the online methanol hydrogen generator 7. The online methanol hydrogen generator 7 converts the methanol supplied by the high-pressure methanol fuel line 1 into hydrogen through a series of chemical reactions and supplies it to the jet valve 9. This allows the turbulent jet ignition-assisted methanol intake port injection engine cold start system to simultaneously supply fuel to both the methanol injector 4 and the jet valve 9 using only one high-pressure methanol fuel line 1, simplifying the engine system structure and reducing investment and maintenance costs.
[0022] The specific structure and working principle of the methanol online hydrogen production unit 7 are existing technologies and will not be described in detail here.
[0023] In this embodiment, the jet channel is tapered, and the size of the jet channel gradually decreases from the pre-combustion chamber 11 to the jet hole 12.
[0024] In this embodiment, there are multiple jet holes 12, and the extension directions of the multiple jet holes 12 are all different.
[0025] The turbulent jet ignition-assisted methanol intake port injection engine cold start system has three switchable operating modes.
[0026] like Figure 2 As shown in the diagram, blue represents the methanol fuel circuit; green represents the hydrogen fuel circuit; orange represents the methanol-air mixture; and light green represents the hydrogen-air mixture. In the first operating mode, during the engine cold start phase, the jet valve 9 injects a measured amount of hydrogen into the pre-combustion chamber 11. Immediately, the spark plug 10 breaks down the electrode gap under high pressure, forming an initial ignition nucleus and triggering rapid combustion of hydrogen in the pre-combustion chamber 11. The bottom of the pre-combustion chamber 11 integrates a tapered jet channel and an array of jet orifices 12. When hydrogen undergoes instantaneous constant-volume combustion in a confined volume, the pressure in the pre-combustion chamber 11 surges. The high-temperature burned gas, after being accelerated through the jet channel, is injected at high speed into the main combustion chamber 6 in the form of multiple turbulent jet flames through the jet orifices 12, directly igniting the methanol-air mixture in the main combustion chamber 6, achieving reliable ignition and stable combustion under cold start conditions.
[0027] like Figure 3As shown in the diagram, blue represents the methanol fuel line, green represents the hydrogen fuel line, orange represents the methanol-air mixture, and red represents the methanol-hydrogen-air mixture. In the second operating mode, during the engine power increase phase, the flow control valve 2 on the mixing channel 3 gradually opens, controlling the appropriate methanol-air mixture to flow from the intake channel 5 into the pre-combustion chamber 11. Simultaneously, the jet valve 9 gradually reduces the mass of hydrogen injected into the pre-combustion chamber 11. The spark plug 10 generates an electric spark by breaking down the air in the electrode gap through high-voltage discharge, igniting the methanol-hydrogen-air mixture in the pre-combustion chamber 11. When the methanol-hydrogen-air mixture in the pre-combustion chamber 11 is ignited, the small volume of the pre-combustion chamber 11 generates a high-pressure flame. After being accelerated through the jet channel, it is then injected through the jet orifice 12 into the main combustion chamber 6, where multiple high-pressure, high-temperature turbulent jet flames ignite the methanol-air mixture.
[0028] like Figure 4 As shown in the diagram, blue represents the methanol fuel circuit, green represents the hydrogen fuel circuit, and orange represents the methanol-air mixture. In the third operating mode, when the engine is under rated operating conditions, the online methanol-hydrogen generator 7 stops operating, and the jet valve 9 stops injecting hydrogen into the pre-combustion chamber 11. The flow control valve 2 of the mixing channel 3 is opened to its maximum, and the fuel in the pre-combustion chamber 11 is entirely a methanol-air mixture. The spark plug 10 generates an electric spark by breaking down the air in the electrode gap through high-voltage discharge, which can ignite the methanol in the pre-combustion chamber 11. The methanol-air mixture in the pre-combustion chamber 11 is ignited, and the small volume of the pre-combustion chamber 11 generates a high-pressure flame. After being accelerated through the jet channel, it is then injected into the main combustion chamber 6 through the jet orifice 12 with multiple high-pressure, high-temperature methanol turbulent jet flames, igniting the methanol-air mixture directly injected into the main combustion chamber 6. Thus, this turbulent jet ignition-assisted methanol intake manifold injection engine cold start system achieves reliable ignition and efficient, low-emission combustion under all operating conditions.
[0029] In this embodiment, the turbulent jet ignition-assisted methanol intake manifold injection engine cold start system also includes an electronic control unit, which is used to control the methanol online hydrogen production device 7 and the flow control valve 2.
[0030] The electronic control unit (ECU) dynamically supplies fuel based on real-time parameters such as engine speed and load, in conjunction with the high-pressure methanol fuel circuit 1, the online methanol-to-hydrogen generator 7, and the flow control valve 2. During cold starts, the flow control valve 2 is closed, and the ECU controls the online methanol-to-hydrogen generator 7 to produce hydrogen at full power, converting some methanol into hydrogen fuel and supplying it to the jet valve 9. This hydrogen turbulence flame ignites the main combustion chamber 6, completely resolving the problem of low-temperature methanol ignition. As engine power gradually increases, the ECU controls the online methanol-to-hydrogen generator 7 to reduce its hydrogen production power, while simultaneously opening the flow control valve 2. This allows the proportion of methanol fuel in the pre-combustion chamber 11 to increase with engine power, achieving a flexible transition in the hydrogen-to-ethanol ratio. When the engine is at its rated operating condition, the ECU controls the online methanol-to-hydrogen generator 7 to close, while simultaneously opening the flow control valve 2 fully. At this point, the engine is in pure methanol mode, with both the pre-combustion chamber 11 and the main combustion chamber 6 burning methanol fuel, releasing the maximum power potential of pure methanol.
[0031] In this embodiment, the housing 8 is located directly above the main combustion chamber 6. The pre-combustion structure is located in the center of the cylinder head.
[0032] In this embodiment, the cylinder is also provided with an exhaust port. The exhaust port and the intake port 5 are located on both sides of the cylinder, respectively.
[0033] This invention also provides a method for operating a turbulent jet ignition-assisted methanol inlet injection engine cold start system, which employs the aforementioned turbulent jet ignition-assisted methanol inlet injection engine cold start system, comprising: High-pressure methanol fuel line 1 supplies high-pressure methanol to methanol injector 4 and online methanol-to-hydrogen generator 7. The methanol supplied to methanol injector 4 is injected into the intake manifold 5 to form a methanol-air mixture. When flow control valve 2 opens, the vast majority of the methanol-air mixture enters the main combustion chamber 6, while a portion enters the pre-combustion chamber 11 via mixing channel 3. Online methanol-to-hydrogen generator 7 converts methanol into high-pressure, high-purity hydrogen through a series of chemical reactions and supplies it to injection valve 9, which then injects it into the pre-combustion chamber 11.
[0034] During engine start-up, flow control valve 2 is closed, methanol online hydrogen production device 7 starts and converts methanol into hydrogen to supply the jet valve 9. The jet valve 9 injects easily ignited hydrogen with a fast flame propagation speed into the pre-combustion chamber 11. At the same time, spark plug 10 immediately discharges, and the hydrogen burns instantly, forming a first high-pressure flame, i.e., a high-pressure hydrogen flame, in the small volume of the pre-combustion chamber 11. The first high-pressure flame is accelerated through a tapered jet channel and then ejected from multiple arrayed jet holes 12, forming multiple first turbulent jet flames, i.e., high-temperature and high-speed hydrogen turbulent jet flames, which are injected into the central area of the main combustion chamber 6. The methanol injected by methanol injector 4 into the intake manifold 5 mixes with air to form a methanol-hydrogen mixture. The methanol-hydrogen mixture enters the main combustion chamber 6 and is ignited by the first turbulent jet flames, thereby achieving reliable ignition and stable combustion under cold start conditions of the methanol engine. During the engine power increase phase, flow control valve 2 opens, and methanol injected by methanol injector 4 into intake manifold 5 mixes with air to form a methanol-hydrogen mixture. Part of the methanol-air mixture in intake manifold 5 enters pre-combustion chamber 11 through the mixture passage, while the other part enters main combustion chamber 6. Online methanol-hydrogen generator 7 supplies hydrogen to injection valve 9, which injects hydrogen into pre-combustion chamber 11, forming a methanol-hydrogen-air mixture. Spark plug 10 then ignites the methanol-hydrogen-air mixture in pre-combustion chamber 11. The gas forms a second high-pressure flame, which is accelerated through the jet channel and ejected from the jet hole 12 to form a second turbulent jet flame, which enters the central region of the main combustion chamber 6. The second turbulent jet flame ignites the methanol-air mixture in the main combustion chamber 6. During the engine power increase phase, as the engine power increases, the opening of the flow control valve 2 gradually increases, and the flow rate of the methanol-air mixture entering the pre-combustion chamber 11 through the mixture channel gradually increases. At the same time, the power of the methanol online hydrogen production device 7 is reduced accordingly, gradually increasing the proportion of methanol fuel in the pre-combustion chamber 11.
[0035] When the engine is running at rated power, the flow control valve 2 is fully open, and the methanol-to-hydrogen device is closed, at which point the engine switches to pure methanol mode. The methanol injected by the methanol injector 4 into the intake manifold 5 mixes with air to form a methanol-hydrogen mixture. Part of the methanol-air mixture in the intake manifold 5 enters the pre-combustion chamber 11 through the mixture channel, and the other part enters the main combustion chamber 6. The spark plug 10 discharges and ignites the methanol-air mixture in the pre-combustion chamber 11, forming a third high-pressure flame. The third high-pressure flame is accelerated through the jet channel and ejected from the jet hole 12, forming a third turbulent jet flame, which enters the central area of the main combustion chamber 6. The third turbulent jet flame ignites the methanol-air mixture in the main combustion chamber 6, thereby releasing the maximum power potential of pure methanol.
[0036] Obviously, the above-disclosed embodiments of the present invention are merely illustrative of the invention. The embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. It is neither necessary nor possible to exhaustively describe all embodiments herein.
Claims
1. A turbulent jet ignition-assisted methanol inlet injection engine cold start system, characterized in that, include: The cylinder has a main combustion chamber (6) inside and an intake manifold (5) above it. Methanol injector (4), the methanol injector (4) is installed in the air intake (5); The pre-combustion structure includes a housing (8) and a spark plug (10) and a jet valve (9) both disposed within the housing (8). The housing (8) is located above the main combustion chamber (6). A pre-combustion chamber (11) is provided inside the housing (8). The spark plug (10) and the jet valve (9) are both located above the pre-combustion chamber (11). A jet channel and a jet hole (12) are provided at the lower end of the housing (8). One end of the jet hole (12) is connected to the pre-combustion chamber (11) through the jet channel, and the other end is connected to the main combustion chamber (6). The mixing passage and flow control valve (2) are provided. The inlet end of the mixing passage is connected to the inlet passage (5), and the outlet end is connected to the pre-combustion chamber (11). The inlet end of the mixing passage (3) is located between the methanol injector (4) and the main combustion chamber (6). The flow control valve (2) is installed on the mixing passage. The high-pressure methanol oil circuit (1) and the methanol online hydrogen production unit (7) are used to supply methanol to the methanol injector (4) and the methanol online hydrogen production unit (7), and the methanol online hydrogen production unit (7) is used to supply hydrogen to the jet valve (9).
2. The turbulent jet ignition-assisted methanol inlet injection engine cold start system according to claim 1, characterized in that: The jet channel is tapered, with the size of the jet channel gradually decreasing from the pre-combustion chamber (11) towards the jet hole (12).
3. The turbulent jet ignition-assisted methanol inlet injection engine cold start system according to claim 1, characterized in that: The number of jet holes (12) is multiple, and the extension directions of the multiple jet holes (12) are different.
4. The turbulent jet ignition-assisted methanol inlet injection engine cold start system according to claim 1, characterized in that: It also includes an electronic control unit, which is used to control the online methanol-to-hydrogen unit (7) and the flow control valve (2).
5. The turbulent jet ignition-assisted methanol inlet injection engine cold start system according to claim 1, characterized in that: The casing (8) is located directly above the main combustion chamber (6).
6. The turbulent jet ignition-assisted methanol inlet injection engine cold start system according to claim 1, characterized in that: The cylinder is also equipped with an exhaust port.
7. A method for operating a cold start system for a methanol intake manifold injection engine with turbulent jet ignition assistance, characterized in that: The turbulent jet ignition-assisted methanol inlet injection engine cold start system according to any one of claims 1-6 comprises: During the engine start-up phase, the flow control valve (2) is closed, the methanol online hydrogen production device (7) is started and converts methanol into hydrogen to supply the jet valve (9). The jet valve (9) injects hydrogen into the pre-combustion chamber (11), and at the same time the spark plug (10) immediately discharges. The hydrogen burns instantly and forms a first high-pressure flame in the pre-combustion chamber (11). The first high-pressure flame is accelerated through the jet channel and then ejected from the jet hole (12) to form a first turbulent jet flame, which is injected into the central area of the main combustion chamber (6). The methanol injected by the methanol injector (4) into the intake manifold (5) mixes with the air to form a methanol-hydrogen mixture. The methanol-hydrogen mixture enters the main combustion chamber (6) and is ignited by the first turbulent jet flame. During the engine power increase phase, the flow control valve (2) opens, and the methanol injected by the methanol injector (4) into the intake manifold (5) mixes with air to form a methanol-hydrogen mixture. Part of the methanol-air mixture in the intake manifold (5) enters the pre-combustion chamber (11) through the mixture channel, and another part of the methanol-air mixture enters the main combustion chamber (6). The online methanol hydrogen production device (7) supplies hydrogen to the jet valve (9), and the jet valve (9) injects hydrogen into the pre-combustion chamber (11), forming a methanol-hydrogen-air mixture in the pre-combustion chamber (11). The spark plug (10) discharges and ignites the methanol-hydrogen-air mixture in the pre-combustion chamber (11), forming a second high-pressure flame. The second high-pressure flame is accelerated through the jet channel and ejected from the jet hole (12) to form a second turbulent jet flame, which is injected into the central area of the main combustion chamber (6). The second turbulent jet flame ignites the methanol-air mixture in the main combustion chamber (6). When the engine is running at rated power, the flow control valve (2) is fully open, the methanol-to-hydrogen device is closed, and the methanol injector (4) injects methanol into the intake manifold (5) and mixes it with air to form a methanol-hydrogen mixture. Part of the methanol-air mixture in the intake manifold (5) enters the pre-combustion chamber (11) through the mixture channel, and another part of the methanol-air mixture enters the main combustion chamber (6). The spark plug (10) discharges and ignites the methanol-air mixture in the pre-combustion chamber (11) to form a third high-pressure flame. The third high-pressure flame is accelerated through the jet channel and ejected from the jet hole (12) to form a third turbulent jet flame, which is injected into the central area of the main combustion chamber (6). The third turbulent jet flame ignites the methanol-air mixture in the main combustion chamber (6).
8. The operating method of the turbulent jet ignition-assisted methanol inlet injection engine cold start system according to claim 7, characterized in that: During the engine power increase phase, as the engine power increases, the opening of the flow control valve (2) gradually increases, and the flow rate of the methanol-air mixture entering the pre-combustion chamber (11) through the mixed gas passage gradually increases. At the same time, the power of the methanol online hydrogen production device (7) also decreases accordingly, gradually increasing the proportion of methanol fuel in the pre-combustion chamber (11).