Methanol engine air inlet channel double-ejector injection system

Abstract

The utility model provides a methanol engine air inlet channel double-ejector injection system. The methanol engine air inlet channel double-ejector injection system comprises an air cylinder of an engine and at least two methanol ejectors. Wherein the two methanol injectors are arranged in the methanol engine gas inlet channel so as to perform methanol injection on the methanol engine gas inlet channel according to a preset injection mode. The at least two methanol injectors are arranged in the air inlet channel of the engine, so that the technical problem that a methanol injection system in the prior art lacks multiple injectors for flexible switching so as to meet the requirements of different working conditions can be solved.

Description

Technical field:

[0001] The utility model relates to the field of methanol injection design of a methanol engine, in particular to an intake duct dual-injector injection system of a methanol engine. Background technology:

[0002] Methanol fuel is currently a key green alternative fuel for marine engines, supporting the country's dual carbon strategy. It helps reduce soot and NOx emissions. Its liquid nature at room temperature makes methanol fuel tanks easier to design and build, offering significant cost advantages.

[0003] Port injection technology involves placing a methanol injector in the intake manifold. Under ECU control, the injector sprays methanol mist, which enters the cylinder along with the air. This method requires minimal engine modification, and the control system allows for flexible adjustment of the methanol injection rate under different operating conditions. This allows for easier switching between diesel and methanol engines, enhances versatility, and offers lower costs and shorter production cycles compared to direct injection solutions.

[0004] Therefore, there is an urgent need for a methanol engine intake dual-injector injection system, which helps to solve the technical problem that the methanol injection system in the existing technology lacks multiple injectors for flexible switching to meet the needs of different working conditions. Utility model content:

[0005] In one embodiment, the utility model provides a dual-injector injection system for the intake duct of a methanol engine, which is provided with at least two methanol injectors arranged in the engine intake duct, helping to solve the technical problem in the prior art that the methanol injection system lacks multiple injectors for flexible switching to meet the requirements of different working conditions.

[0006] The methanol engine intake dual-injector injection system includes an engine cylinder and at least two methanol injectors;

[0007] Two methanol injectors are arranged in the intake passage of the methanol engine to inject methanol according to a predetermined injection method.

[0008] In one embodiment, the methanol engine intake dual-injector injection system further includes a methanol storage tank and a methanol pump, as well as a nitrogen system;

[0009] One end of the methanol pump is connected to the methanol storage tank;

[0010] The nitrogen system is used to perform nitrogen addition treatment on the methanol supplied by the methanol pump, and the other end of the methanol pump is connected to the methanol injector.

[0011] In one embodiment, the nitrogen system includes a first nitrogen system and a second nitrogen system;

[0012] a first nitrogen system, configured to supply nitrogen between the methanol pump and the methanol storage tank;

[0013] The second nitrogen system is used to supply nitrogen between the methanol pump and the methanol injector.

[0014] In one embodiment, the methanol engine intake dual-injector injection system further includes a return pipe;

[0015] One end of the return pipe is connected to the discharge port of the remaining methanol discharged by the methanol pump, and the other end of the return pipe is connected between the first nitrogen system and the methanol pump.

[0016] In one embodiment, the methanol pump is provided with a parallel branch pipe.

[0017] In one embodiment, the methanol engine intake dual-injector injection system includes a pressure regulating valve and a methanol inlet main valve;

[0018] The pressure regulating valve is connected in series between the methanol pump and the methanol injector;

[0019] The methanol inlet main valve is connected in series between the pressure regulating valve and the methanol injector.

[0020] In one embodiment, the methanol engine intake dual-injector injection system further includes a nitrogen purge valve;

[0021] The nitrogen purge valve is connected to the gas outlet port of the second nitrogen system.

[0022] In one embodiment, a return pipe is provided between the pressure regulating valve and the methanol inlet main valve, and the return pipe returns part of the methanol to between the first nitrogen system and the methanol pump.

[0023] In one embodiment, the methanol engine intake dual-injector injection system further includes a methanol recovery tank;

[0024] The methanol recovery tank is connected between the first nitrogen system and the methanol pump through a pipeline. The return pipe and the return pipe both discharge methanol into the methanol recovery tank and then inject it between the first nitrogen system and the methanol pump through the pipeline.

[0025] In one embodiment, two methanol injectors are arranged above the intake passage of each cylinder. The methanol injectors are placed in a bushing, and the bushing is connected to a methanol branch pipe and fixed by a flange connection. Description of the drawings:

[0026] Figure 1 This is a schematic diagram of the architecture of a dual-injector injection system for an intake port of a methanol engine according to one embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the arrangement of dual methanol injectors at the intake duct in another embodiment of the present invention;

[0028] Figure 3 Schematic diagram of a dual-injector injection method for a methanol engine intake port according to another embodiment of the present invention.

[0029] Reference numerals:

[0030] Cylinder 1 of the engine

[0031] Methanol injector 2

[0032] Methanol storage tank 3

[0033] Methanol pump 4

[0034] Parallel branch pipe 41

[0035] Nitrogen system 5

[0036] First nitrogen system 51

[0037] Second nitrogen system 52

[0038] Return pipe 6

[0039] Pressure regulating valve 7

[0040] Methanol inlet main valve 8

[0041] Nitrogen purge valve 9

[0042] Return pipe 10

[0043] Methanol recovery tank 101 Specific embodiment:

[0044] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0045] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0046] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0047] It should also be understood that although the present application has been described with reference to certain specific examples, those skilled in the art will be able to implement many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0048] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0049] Specific embodiments of the present application will be described below with reference to the accompanying drawings; however, it should be understood that the embodiments described are merely examples of the present application and may be implemented in a variety of ways. Familiar and / or repetitive functions and structures are not described in detail to clarify the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details described herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any appropriate detailed structure.

[0050] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0051] Figure 1 This is a schematic diagram of the architecture of a dual-injector injection system for an intake port of a methanol engine according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the arrangement of dual methanol injectors at the intake duct in another embodiment of the present invention. Figure 3 Schematic diagram of a dual-injector injection method for a methanol engine intake port according to another embodiment of the present invention.

[0052] like Figures 1 to 3 As shown, in one embodiment, the utility model provides a methanol engine intake duct dual-injector injection system, the methanol engine intake duct dual-injector injection system includes an engine cylinder 1 and at least two methanol injectors 2;

[0053] Two methanol injectors 2 are arranged at the intake passage of the methanol engine to inject methanol according to a predetermined injection method.

[0054] This embodiment provides a specific implementation of a dual-injector injection system for a methanol engine intake. Two or more methanol injectors 2 are employed to perform injection according to different strategies. The engine control module calculates the methanol injection amount based on collected signals such as onboard rail pressure, scavenging pressure, and valve opening, flexibly responding to changes in engine operating conditions and generating signals to drive the injectors to inject into the cylinders. Methanol parameters primarily include injection timing and injection pulse width, which are related to the current level and duration of the electromagnetic force controlling the valve core. After receiving the signal, the methanol injector, under the action of the electromagnetic force, pulls a spring to control the vertical displacement of the valve core. The timing and duration of injection start and stop depend on the specified injection timing and injection pulse width. Methanol is ejected from the injector's nozzle plate at the specified timing and atomized, mixing with the compressed air in the intake duct. Injection parameters can be adjusted based on engine operating conditions to ensure a more uniform air and methanol mixture enters the cylinder, reducing methanol wall adhesion and achieving better combustion and emissions.

[0055] Between 30% and 100% load, dual injectors are used simultaneously to ensure sufficient methanol injection and improve the engine's methanol substitution rate. Between 20% and 30% load, a single injector is used to prevent excessive methanol injection and detonation. The switching and activation of the single and dual injectors are controlled by signals from the engine control system. The actual injection volume can be calibrated during testing by adjusting the injection pulse width and timing to achieve optimal performance under specific operating conditions. The methanol pipeline utilizes a double-walled structure and is equipped with a methanol leak sensor. When the concentration exceeds the alarm threshold, the engine control system deactivates the methanol injector and activates a high-pressure nitrogen purge to ensure engine safety.

[0056] In one embodiment, the methanol engine intake dual-injector injection system further includes a methanol storage tank 3, a methanol pump 4, and a nitrogen system 5;

[0057] One end of the methanol pump 4 is connected to the methanol storage tank 3;

[0058] The nitrogen system 5 is used to perform nitrogen addition treatment on the methanol supplied by the methanol pump 4 , and the other end of the methanol pump 4 is connected to the methanol injector 2 .

[0059] This embodiment provides a specific implementation of how a system supplies methanol to the methanol injector 2 .

[0060] In one embodiment, the nitrogen system 5 includes a first nitrogen system 51 and a second nitrogen system 52;

[0061] A first nitrogen system 51 is used to supply nitrogen between the methanol pump 4 and the methanol storage tank 3;

[0062] The second nitrogen system 52 is used to supply nitrogen between the methanol pump 4 and the methanol injector 2 .

[0063] In one embodiment, the methanol engine intake dual-injector injection system further includes a return pipe 6;

[0064] One end of the return pipe 6 is connected to the discharge port of the last remaining methanol discharged from the methanol pump 4 , and the other end of the return pipe 6 is connected between the first nitrogen system 51 and the methanol pump 4 .

[0065] In one embodiment, the methanol pump 4 is provided with a parallel branch pipe 41 .

[0066] In one embodiment, the methanol engine intake dual-injector injection system includes a pressure regulating valve 7 and a methanol inlet main valve 8;

[0067] The pressure regulating valve 7 is connected in series between the methanol pump 4 and the methanol injector 2;

[0068] The methanol inlet main valve 8 is connected in series between the pressure regulating valve 7 and the methanol injector 2.

[0069] In one embodiment, the methanol engine intake dual-injector injection system further includes a nitrogen purge valve 9;

[0070] The nitrogen purge valve 9 is connected to the gas outlet port of the second nitrogen system 52 .

[0071] In one embodiment, a return pipe 10 is provided between the pressure regulating valve 7 and the methanol inlet main valve 8 , and the return pipe 10 returns part of the methanol to between the first nitrogen system 51 and the methanol pump 4 .

[0072] In one embodiment, the methanol engine intake dual-injector injection system further includes a methanol recovery tank 101;

[0073] The methanol recovery tank 101 is connected between the first nitrogen system 51 and the methanol pump 4 through a pipeline. The return pipe 6 and the return pipe 10 both discharge methanol into the methanol recovery tank 101 and then inject it between the first nitrogen system 51 and the methanol pump 4 through the pipeline.

[0074] In one embodiment, two methanol injectors 2 are positioned above the intake duct of each cylinder. These injectors 2 are housed within a bushing connected to a methanol branch pipe and secured via a flange. The intake duct is connected to an intake manifold, which delivers compressed air to the intake duct for work within the cylinder.

[0075] Methanol is stored in a methanol tank and pumped to the methanol main pipe via a methanol pump. The pipe is then regulated to a fixed pressure by a pressure reducing valve. The methanol main pipe is connected to multiple methanol branches, depending on the number of engine cylinders, to supply the injectors with methanol spray.

[0076] The other side of the cylinder is connected to the exhaust manifold to discharge the exhaust gas generated by the combustion of methanol.

[0077] Based on the above system, the method includes:

[0078] A methanol engine intake duct dual-injector injection method is characterized in that, based on a cylinder of an engine, at least two methanol injectors are arranged in the intake duct of the cylinder, and the methanol engine intake duct dual-injector injection method includes:

[0079] Working condition parameters obtained through detection devices;

[0080] Calculating the methanol injection amount according to the operating condition parameters;

[0081] The injection is realized after configuring single injection or multiple injections according to the predetermined injection parameter rules.

[0082] The operating parameters include onboard rail pressure, scavenging pressure, and valve opening.

[0083] The predetermined injection parameter rules include injection timing, injection pulse width, and current magnitude and duration of the electromagnetic force controlling the valve core.

[0084] After the injection step is completed by configuring a single injection or multiple injections according to a predetermined injection parameter rule, the method includes:

[0085] Methanol is sprayed out from the nozzle plate of the injector at a given timing and atomized to mix with the compressed air in the intake duct.

[0086] After the injection step is completed by configuring a single injection or multiple injections according to a predetermined injection parameter rule, the method further includes:

[0087] The methanol stored in the methanol tank is pumped into the methanol main pipe through a methanol pump and flows through a pressure reducing valve to be adjusted to a fixed pressure value.

[0088] The predetermined injection parameter rule further includes adopting dual injectors to inject simultaneously when the load is 30%-100%, and adopting single injector to inject when the load is 20%-30%.

[0089] Beneficial effects:

[0090] 1. The injector is wrapped with a bushing to reduce the leakage of the injector, help ensure its sealing, protect the injector from friction and wear, extend its service life, and improve the stability and safety of the machine.

[0091] 2. The injection amount and injection pressure of methanol are flexibly adjusted through the engine control system so that the methanol spray is located in the center of the intake duct to reduce wall adhesion.

[0092] 3. Single-injector or dual-injector injection strategies can be selected according to the engine operating parameters to meet the requirements of large methanol injection volume under high load and small methanol injection volume under low load, avoiding engine knock caused by excessive methanol injection.

[0093] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A methanol engine intake dual-injector injection system, characterized in that: The methanol engine intake port dual-injector injection system includes: a cylinder (1) of an engine; At least two methanol injectors (2), wherein the two methanol injectors (2) are arranged at the intake passage of the methanol engine to inject methanol according to a predetermined injection method; The methanol engine intake port dual-injector injection system also includes: a methanol storage tank (3); a methanol pump (4), one end of which is connected to the methanol storage tank (3); A nitrogen system (5) is used for nitrogenating the methanol supplied by the methanol pump (4), and the other end of the methanol pump (4) is connected to the methanol injector (2).

2. The methanol engine intake dual-injector injection system according to claim 1, characterized in that: The nitrogen system (5) comprises: a first nitrogen system (51) for supplying nitrogen between the methanol pump (4) and the methanol storage tank (3); A second nitrogen system (52) is used to supply nitrogen between the methanol pump (4) and the methanol injector (2).

3. The methanol engine intake dual-injector injection system according to claim 2, characterized in that: The methanol engine intake port dual-injector injection system also includes: A return pipe (6) has one end connected to the discharge port of the last remaining methanol discharged from the methanol pump (4), and the other end of the return pipe (6) is connected between the first nitrogen system (51) and the methanol pump (4).

4. The methanol engine intake port dual-injector injection system according to claim 3, characterized in that: The methanol pump (4) is provided with a parallel branch pipe (41).

5. The methanol engine intake port dual-injector injection system according to claim 4, characterized in that: The methanol engine intake port dual-injector injection system includes: a pressure regulating valve (7) connected in series between the methanol pump (4) and the methanol injector (2); A methanol inlet main valve (8) is connected in series between the pressure regulating valve (7) and the methanol injector (2).

6. The methanol engine intake port dual-injector injection system according to claim 5, characterized in that: The methanol engine intake port dual-injector injection system also includes: A nitrogen purge valve (9) is connected to the outlet port of the second nitrogen system (52).

7. The methanol engine intake dual-injector injection system according to claim 6, characterized in that: A return pipe (10) is provided between the pressure regulating valve (7) and the methanol inlet main valve (8), and the return pipe (10) returns part of the methanol to between the first nitrogen system (51) and the methanol pump (4).

8. The methanol engine intake port dual-injector injection system according to claim 7, characterized in that: The methanol engine intake port dual-injector injection system also includes: A methanol recovery tank (101) is connected between the first nitrogen system (51) and the methanol pump (4) through a pipeline. The return pipe (6) and the return pipe (10) both discharge methanol into the methanol recovery tank (101) and then inject it into the space between the first nitrogen system (51) and the methanol pump (4) through the pipeline.

9. The methanol engine intake port dual-injector injection system according to claim 8, characterized in that: Two methanol injectors (2) are arranged above the intake passage of each cylinder. The methanol injectors (2) are placed in a bushing, and the bushing is connected to a methanol branch pipe and fixed via a flange connection.

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