KR102709559B1 - The system and method that supplies fuel to marine engines - Google Patents

Abstract

The present invention relates to a ship engine fuel supply system and method, and in the present invention, under a communication infrastructure such as an engine controller, a fuel supply control unit, and a pilot oil injector, <a computer module capable of inducing 'pilot oil for promoting combustion for promoting combustion during main combustion' to be pre-injected at a point in time before the ignition pilot oil is injected>, <a computer module capable of inducing pilot oil for promoting re-combustion to be additionally injected subsequently to re-combust unburned gas in a situation where the ignition pilot oil is injected into a combustion chamber and the air/gas mixture is combusted>, etc., and through this, on the side of the air/gas mixture supplied to the combustion chamber, 'an improved combustion environment is induced by the action of the combustion-promoting pilot oil injected in advance at a point in time before the injection of the ignition pilot oil during full-scale combustion by the ignition action of the ignition pilot oil', or 'after full-scale combustion by the ignition action of the ignition pilot oil, additionally injected at a point in time after the injection of the ignition pilot oil. By inducing the ship to be in an 'environment where unburned gas can be reburned by the action of the injected reburn-promoting pilot oil,' it is ultimately possible to support ship operators, including ship owners, to effectively avoid problems (i.e., environmental pollution problems, etc.) of the generation of hazardous substances/pollutants (e.g., methane gas, etc.) due to unburned or incomplete combustion of the air/gas mixture.

Description

{The system and method that supplies fuel to marine engines}

The present invention relates to a system and method for supplying fuel to a marine engine (e.g., a dual-fuel engine), and more specifically, to a system and method for supplying fuel to a marine engine (e.g., a dual-fuel engine), and more specifically, to a system and method for systematically arranging/providing, under a communication infrastructure such as an engine controller, a fuel supply control unit, and a pilot oil injector, <a computer module capable of inducing 'pilot oil for promoting combustion for promoting combustion during main combustion' to be pre-injected at a point in time before ignition pilot oil is injected>, <a computer module capable of inducing pilot oil for promoting re-combustion to be additionally injected subsequently to re-combust unburned gas in a combustion chamber under a situation in which ignition pilot oil is injected into a combustion chamber and an air/gas mixture is combusted>, and through this, on the side of the air/gas mixture supplied to the combustion chamber, 'an improved combustion environment is induced by the action of the combustion-promoting pilot oil injected in advance at a point in time before the injection of the ignition pilot oil during full-scale combustion by the ignition action of the ignition pilot oil', or 'full-scale combustion by the ignition action of the ignition pilot oil'. The present invention relates to a marine engine fuel supply system and method which can effectively help ship operators, including ship owners, avoid problems of generating hazardous substances/pollutants (e.g., methane gas, etc.) caused by uncombusted or incomplete combustion of an air/gas mixture (i.e., environmental pollution problems, etc.) by inducing an environment in which uncombusted gas can be recombusted by the action of additionally injected recombustion promoting pilot oil at a point in time after the injection of the pilot oil for ignition.

Recently, with the rapid development of ship-related technology, 'fuel supply technology' to meet environmental regulations or 'fuel supply technology' to efficiently supply fuel to ship engines are also undergoing extensive development.

For example, Korean Patent No. 10-2018999 (Title: Piston engine operating method and piston engine) (announced on September 6, 2019), Korean Publication Patent No. 10-2016-41522 (Title: Combustion start timing balancing device and method through pilot oil injection amount control of dual fuel engine) (published on April 18, 2016), Korean Publication Patent No. 10-2017-49926 (Title: Pilot oil system test method of dual fuel engine) (published on May 11, 2017), Korean Publication Patent No. 10-2020-117908 (Title: Heterogeneous fuel engine) (published on October 14, 2020), Korean Publication Patent No. 10-2008-32948 (Title: Diesel and diesel pilot natural gas of diesel engine) An example of a conventional ‘ship engine fuel supply technology’ is disclosed in more detail in the ‘Bi-Dual Combustion System’ (released on April 16, 2008).

Meanwhile, as illustrated in FIG. 1, under a conventional system, a marine engine fuel supply system (10) for supplying fuel to a marine engine (e.g., a dual-fuel engine) comprises a marine engine (16) having a cylinder (17) and a combustion chamber (18), an engine controller (14) for controlling them while communicating with the marine engine (16), a fuel supply control unit (11), etc., an oil fuel supply unit (12) for supplying oil fuel to the combustion chamber (18) of the marine engine (16) under an oil fuel supply mode, a gas fuel supply unit (13) for supplying gas fuel to the combustion chamber (18) of the marine engine (16) under a gas fuel supply mode, and while communicating with the oil fuel supply unit (12), the gas fuel supply unit (13), etc., for example, depending on the fuel supply mode, the pressurization state of the cylinder (17), the temperature state of the combustion chamber (18), etc. A fuel supply control unit (11) that controls a fuel supply unit (13), etc. to selectively supply oil fuel or gas fuel into the interior of a combustion chamber (18), and a pilot oil injector (15) that injects a small amount of pilot oil for ignition into the interior of a combustion chamber (18) under a gas fuel supply mode are systematically combined to form a configuration.

At this time, in the fuel supply control unit (11), under the gas fuel supply mode, in a situation where an air/gas mixture is supplied to the combustion chamber (18) of the marine engine (16) (for reference, air is sucked in through a supercharger under the intake stroke of the gas fuel supply mode, and then goes through a procedure where the air is pressurized higher than the atmospheric pressure and supplied to the combustion chamber), the pilot oil injector (15) is controlled so that the 'minimum compression work/maximum expansion work' occurs, thereby inducing the 'pilot oil for ignition to ignite the air/gas mixture' to be injected into the combustion chamber (18).

Meanwhile, under this conventional system, when gas is supplied from outside the combustion chamber (18), the gas fuel supply unit (13) supplies gas at low pressure. As a reference, when high-pressure injection is to be used, a supply system (e.g., compressor, high-pressure piping, high-pressure injection device, etc.) that can withstand high pressure must be additionally designed.

However, as described above, when an air/gas mixture is supplied into the combustion chamber (18) at low pressure under the intake stroke, a problem inevitably arises in which the 'supplied air/gas mixture is widely spread throughout the combustion chamber (18).'

Of course, in this way, in a situation where the air/gas mixture supplied at low pressure is widely spread throughout the combustion chamber (18), ignition is achieved by the injection of pilot oil for ignition by the pilot oil injector (15), and thus, a series of combustions proceed, a serious problem occurs in which a large amount of unburned gas (or incompletely burned gas) remains near the wall surface inside the combustion chamber (18) or in the microscopic gaps inside the combustion chamber (18).

Naturally, even after combustion, if a large amount of unburned gas or incompletely burned gas remains near the wall surface inside the combustion chamber (18) or in the microscopic gaps inside the combustion chamber (18), when the exhaust gas is discharged through the exhaust pipe (19) during the exhaust stroke, the exhaust gas is discharged mixed with hazardous substances (e.g., methane gas, etc.), causing serious environmental pollution. Ultimately, unless separate measures are taken, the ship operator, including the ship owner, has no choice but to fully bear all the serious damage caused by the hazardous substances (e.g., damage caused by environmental pollution, property damage caused by payment of taxes such as carbon tax, etc.).

Korean Patent Registration No. 10-2018999 (Title: Piston Engine Operating Method and Piston Engine) (Public Notice on September 6, 2019) Korean Patent Publication No. 10-2016-41522 (Title: Combustion start timing balancing device and method through pilot oil injection amount control of dual fuel engine) (Published on April 18, 2016) Republic of Korea Publication Patent No. 10-2017-49926 (Title: Pilot oil system test method of dual fuel engine) (Published on May 11, 2017) Republic of Korea Publication Patent No. 10-2020-117908 (Title: Heterogeneous Fuel Engine) (Published on October 14, 2020) Korean Patent Publication No. 10-2008-32948 (Title: Diesel and Diesel Pilot Natural Gas Bi-Dual Combustion System for Diesel Engine) (Published on April 16, 2008)

Accordingly, the purpose of the present invention is to systematically arrange/provide, under the communication infrastructure of an engine controller, a fuel supply control unit, a pilot oil injector, etc., a <computer module capable of inducing 'pilot oil for promoting combustion for promoting combustion during main combustion' to be pre-injected at a point in time before the ignition pilot oil is injected>, a <computer module capable of inducing pilot oil for promoting re-combustion to be additionally injected subsequently to re-combust unburned gas in a situation where the ignition pilot oil is injected into a combustion chamber and the air/gas mixture is combusted>, and through this, on the side of the air/gas mixture supplied to the combustion chamber, an 'improved combustion environment due to the action of the combustion-promoting pilot oil injected in advance at a point in time before the injection of the ignition pilot oil during full-scale combustion by the ignition action of the ignition pilot oil' is inducible, or 'after full-scale combustion by the ignition action of the ignition pilot oil, by the action of the pilot oil for promoting re-combustion additionally injected at a point in time after the injection of the ignition pilot oil. By inducing the ship operator to be in an 'environment where unburned gas can be re-burned', the purpose is to effectively help avoid problems (i.e. environmental pollution problems, etc.) caused by unburned or incomplete combustion of air/gas mixtures by the ship operator.

Other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

In order to achieve the above object, the present invention discloses a fuel supply system for a marine engine, comprising: a marine engine having a combustion chamber; a gas fuel supply unit supplying gas to the combustion chamber; a fuel supply control unit controlling the gas fuel supply unit; a pilot oil injector injecting ignition pilot oil for igniting the air/gas mixture when the air/gas mixture is supplied to the combustion chamber; and a pilot auxiliary injection control unit communicating with the fuel supply control unit or the pilot oil injector, and allowing combustion-promoting pilot oil to be injected at a time point before the ignition pilot oil is injected to promote the propagation of a flame to the combustion chamber, wherein the pilot auxiliary injection control unit controls the pilot oil injector at a time point after the ignition pilot oil is injected into the combustion chamber, thereby allowing additional injection of recombustion-promoting pilot oil for recombusting unburned gas into the combustion chamber.

In addition, in another aspect of the present invention, a method for supplying fuel to a marine engine is disclosed, comprising: a step of supplying an air/gas mixture to a combustion chamber of a marine engine; a step of injecting a combustion-promoting pilot oil to promote flame propagation into the combustion chamber; a step of injecting an ignition pilot oil to ignite the air/gas mixture into the combustion chamber; and a step of additionally injecting a re-combustion-promoting pilot oil to re-combust unburned gas into the combustion chamber.

In the present invention, under the communication infrastructure of an engine controller, a fuel supply control unit, a pilot oil injector, etc., a <computer module capable of inducing 'pilot oil for promoting combustion during main combustion' to be pre-injected at a point in time before the ignition pilot oil is injected>, a <computer module capable of inducing pilot oil for promoting re-combustion to be additionally injected subsequently to re-combust unburned gas in the combustion chamber under a situation in which the ignition pilot oil is injected into the combustion chamber and the air/gas mixture is combusted>, etc., are systematically arranged/provided. Therefore, under the implementation environment of the present invention, the air/gas mixture supplied to the combustion chamber can be in an 'improved combustion environment due to the action of the pilot oil for promoting combustion injected in advance at a point in time before the injection of the ignition pilot oil during full-scale combustion by the ignition action of the ignition pilot oil', or 'after full-scale combustion by the ignition action of the ignition pilot oil, due to the action of the pilot oil for promoting re-combustion additionally injected at a point in time after the injection of the ignition pilot oil. This will allow the ship to be placed in an 'environment where unburned gas can be re-burned', and ultimately, the ship operator, including the ship owner, will be able to effectively avoid problems (i.e., environmental pollution problems, etc.) of generating hazardous substances/pollutants (e.g., methane gas, etc.) due to unburned or incomplete combustion of the air/gas mixture.

Figure 1 is an exemplary diagram conceptually illustrating a detailed configuration of a ship engine fuel supply system according to conventional technology.
Figure 2 is an exemplary diagram conceptually illustrating a detailed configuration of a marine engine fuel supply system according to the present invention.
FIG. 3 is an exemplary diagram conceptually illustrating a detailed configuration of a pilot auxiliary injection control unit according to the present invention.
Figure 4 is an exemplary diagram conceptually illustrating a detailed operation procedure of a pilot auxiliary injection control unit according to the present invention.

Hereinafter, with reference to the attached drawings, the marine engine fuel supply system and method according to the present invention will be described in more detail.

As shown in Fig. 2, under the system of the present invention,

A marine engine fuel supply system (20) for supplying fuel to a marine engine (e.g., a dual-fuel engine) comprises: a marine engine (26) having a cylinder (17) and a combustion chamber (28); an engine controller (24) for controlling the marine engine (26), a fuel supply control unit (21), etc., while communicating with them; an oil fuel supply unit (22) for supplying oil fuel to the combustion chamber (28) of the marine engine (26) under an oil fuel supply mode; a gas fuel supply unit (23) for supplying gas fuel to the combustion chamber (28) of the marine engine (26) under a gas fuel supply mode; and while communicating with the oil fuel supply unit (22), the gas fuel supply unit (23), etc., for example, according to the fuel supply mode, the pressurization state of the cylinder (27), the temperature state of the combustion chamber (28), etc., A fuel supply control unit (21) that allows oil fuel or gas fuel to be selectively supplied into the combustion chamber (28) and a pilot oil injector (25) that injects a small amount of pilot oil for ignition into the combustion chamber (28) under the gas fuel supply mode are systematically combined to form a configuration.

At this time, in the fuel supply control unit (21), under the gas fuel supply mode, in a situation where an air/gas mixture is supplied to the combustion chamber (28) of the marine engine (26) (for reference, air is sucked in through a supercharger under the intake stroke of the gas fuel supply mode, and then goes through a procedure where the air is pressurized higher than the atmospheric pressure and supplied to the combustion chamber), the pilot oil injector (25) is controlled so that the 'minimum compression work/maximum expansion work' occurs, thereby inducing the 'pilot oil for ignition to ignite the air/gas mixture' to be injected into the combustion chamber (28).

Meanwhile, even under the system of the present invention, when gas is supplied from outside the combustion chamber (28), gas is supplied at low pressure from the gas fuel supply unit (23).

However, under the intake stroke, when the air/gas mixture is supplied into the combustion chamber (28) at low pressure, a problem inevitably occurs in which the 'supplied air/gas mixture is widely spread throughout the combustion chamber (28).'

Of course, in this way, in a situation where the air/gas mixture supplied at low pressure is widely spread throughout the combustion chamber (28), ignition is achieved by the injection of pilot oil for ignition by the pilot oil injector (25), and thus, a series of combustions proceed, a serious problem occurs in which a large amount of unburned gas (or incompletely burned gas) remains near the wall surface inside the combustion chamber (28) or in the microscopic gaps inside the combustion chamber (28).

Naturally, even after combustion, if a large amount of unburned gas or incompletely burned gas remains near the wall surface inside the combustion chamber (28) or in the microscopic gaps inside the combustion chamber (28), when the exhaust gas is discharged through the exhaust pipe (29) during the exhaust stroke, the exhaust gas is discharged mixed with hazardous substances (e.g., methane gas, etc.), causing serious environmental pollution. Ultimately, unless separate measures are taken, the ship operator, including the ship owner, has no choice but to fully bear all the serious damage caused by the hazardous substances (e.g., damage caused by environmental pollution, property damage caused by payment of taxes such as carbon tax, etc.).

Under such a sensitive situation, as illustrated in FIG. 2, the present invention takes a measure of additionally arranging a pilot auxiliary injection control unit (30) unique to the present invention under the communication infrastructure of an engine controller (24), a fuel supply control unit (21), a pilot oil injector (25), etc. In this case, the pilot auxiliary injection control unit (30) of the present invention may be installed subordinately within the program block of the fuel supply control unit (21) depending on the situation.

At this time, the pilot auxiliary injection control unit (30) of the present invention communicates with the engine controller (24), the fuel supply control unit (21), the pilot oil injector (25), etc., and performs the role of inducing the injection of combustion promoting pilot oil to promote flame propagation (or, to improve the combustion environment) into the combustion chamber (28) before the ignition pilot oil is injected.

In addition, in the pilot auxiliary injection control unit (30) of the present invention, when the pilot oil for ignition is injected into the combustion chamber (28) and the air/gas mixture is combusted, it communicates with the fuel supply control unit (21), the pilot oil injector (25), etc., and directly or indirectly controls the pilot oil injector (25), thereby inducing additional injection of pilot oil for promoting recombustion to recombust unburned gas into the combustion chamber (28).

In this case, as illustrated in FIG. 3, the pilot auxiliary injection control unit (30) according to the present invention has a configuration in which an operating information storage module (32), a main injection check module (33), a pre-injection execution induction module (35), a post-injection execution induction module (34), etc., communicate with an engine controller (24), a fuel supply control unit (21), a pilot oil injector (25), etc., via an interface module (31), are closely combined.

At this time, the operation information storage module (32) stores/manages, in its information storage area, registration information of the engine controller (24), registration information of the fuel supply control unit (21), registration information of the pilot oil injector (25), program source information for forming/maintaining a communication session, program source information for performing functions of computer modules, etc., thereby supporting the pilot auxiliary injection procedure according to the present invention (e.g., pre-injection procedure of pilot oil for promoting combustion, post-injection procedure of pilot oil for promoting re-combustion, etc.) to proceed normally without any particular problems.

In addition, the main injection check module (33) communicates with the engine controller (24), the fuel supply control unit (21), the pilot oil injector (25), etc., via the interface module (31), and checks, for example, the 'temperature status of the combustion chamber (28),' the 'crank shaft angle of the cylinder (27),' the 'injection status of the pilot oil injector (25),' and through this, a procedure is performed to check whether the pilot oil for ignition is injected (i.e., 'whether the main injection is executed').

In addition, the pre-injection execution induction module (35) communicates with the main injection check module (33), and if it is determined by the main injection check module (33) that the ignition pilot oil is not injected, it communicates with the fuel supply control unit (21), the pilot oil injector (25), etc., and directly or indirectly controls the pilot oil injector (25), so that, as shown in FIG. 4, a procedure is performed to induce the combustion promotion pilot oil to be pre-injected into the combustion chamber (28) at a time point before the ignition pilot oil is injected (i.e., at a time point before the execution of the 'main injection') (i.e., a procedure to induce the execution of the 'pre-injection').

Furthermore, in the post-injection execution induction module (34), when communicating with the main injection check module (32), if it is confirmed/judged that the ignition pilot oil has been injected by the main injection check module (33), the module communicates with the pilot oil injector (25) or the fuel supply control unit (21) to directly or indirectly control the pilot oil injector (25), so that, as shown in FIG. 4, at a point in time after the ignition pilot oil has been injected (i.e., at a point in time after the execution of the 'main injection'), a procedure is performed to induce additional injection of the re-combustion-promoting pilot oil into the combustion chamber (28) (i.e., a procedure to induce the execution of the 'post-injection').

In short, the present invention newly improves/implements a method for supplying fuel to a marine engine by <a step of supplying gas (or air/gas mixture) to a combustion chamber (28) of a marine engine (26)>, <a step of injecting combustion-promoting pilot oil to promote flame propagation into the combustion chamber (28) (pre-injection step)>, <a step of injecting ignition pilot oil to ignite the air/gas mixture into the combustion chamber (28) (main injection step)>, <a step of additionally injecting re-combustion-promoting pilot oil to re-combust unburned gas into the combustion chamber under the condition that the ignition pilot oil is injected into the combustion chamber (28) and the air/gas mixture is combusted (post-injection step)>.

At this time, in the present invention, depending on the situation (e.g., depending on the capacity of the engine, the size of the combustion chamber, the amount of air/gas mixture supplied, etc.), the pilot oil for promoting combustion or the pilot oil for promoting re-combustion may be injected multiple times (i.e., in the 'pre-injection stage', the pilot oil for promoting combustion may be injected twice or more, and in the 'post-injection stage', the pilot oil for promoting re-combustion may be injected twice or more).

At this time, since the combustion-promoting pilot oil supplied under the pre-injection stage has a lower auto-ignition temperature than the air/gas, if the combustion-promoting pilot oil is premixed with the air/gas before the ignition pilot oil is injected, the air/gas side can be placed in an environment in which flame propagation is significantly promoted (i.e., an improved combustion environment) when a full-scale combustion procedure is performed, and ultimately, since combustion in the end portion of the combustion chamber (28) and the gap volume where quenching and incomplete combustion are highly likely are significantly improved, even when the exhaust gas is discharged to the exhaust pipe (29) in the exhaust stroke, no harmful substances/pollutants (e.g., methane gas, etc.) are generated.

In addition, the pilot oil for promoting re-combustion supplied under the post-injection stage reliably performs the function of re-combusting the 'unburned/incompletely combusted air/gas' located at the end of the combustion chamber (28) and in the gap volume, and even in this case, even when the exhaust gas is discharged to the exhaust pipe (29) in the exhaust stroke, no harmful substances/pollutants (e.g., methane gas, etc.) are generated.

In this way, in the present invention, under the communication infrastructure of the engine controller, the fuel supply control unit, the pilot oil injector, etc., <a computer module that can induce 'pilot oil for promoting combustion for promoting combustion during main combustion' to be pre-injected at a point in time before the ignition pilot oil is injected>, <a computer module that can induce pilot oil for promoting re-combustion to be additionally injected subsequently to re-combust unburned gas in the combustion chamber under a situation in which the ignition pilot oil is injected into the combustion chamber and the air/gas mixture is combusted>, etc., so that, under the implementation environment of the present invention, the air/gas mixture supplied to the combustion chamber can be in an 'improved combustion environment due to the action of the pilot oil for promoting combustion injected in advance at a point in time before the injection of the ignition pilot oil during full-scale combustion by the ignition action of the ignition pilot oil', or 'after full-scale combustion by the ignition action of the ignition pilot oil, the pilot oil for promoting re-combustion is additionally injected at a point in time after the injection of the ignition pilot oil. The ship will be placed in an 'environment where unburned gas can be re-burned due to the action of oil,' and as a result, the ship operator, including the ship owner, will be able to effectively avoid problems (i.e., environmental pollution problems, etc.) of generating hazardous substances/pollutants (e.g., methane gas, etc.) due to unburned or incomplete combustion of the air/gas mixture.

For reference, in the present invention, the combination of 'pre-injection + main injection + post-injection' described above can be flexibly applied by partially selecting it according to the operating conditions of the engine.

The present invention has a generally useful effect in various fields where efficient blocking of engine-side contaminants is required.

And, although specific embodiments of the present invention have been described and illustrated above, it is self-evident that the present invention may be practiced in various ways by those skilled in the art.

Such modified embodiments should not be understood individually from the technical idea or viewpoint of the present invention, and such modified embodiments should fall within the scope of the appended claims of the present invention.

10,20: Marine engine fuel supply system
11,21: Fuel supply control unit
12,22: Oil fuel supply unit
13,23: Gas fuel supply unit
14,24: Engine controller
15,25: Pilot oil injector
16,26: Marine engines
17,27: Cylinder
18,28: Combustion chamber
19,29: Exhaust pipe
30: Pilot Auxiliary Injection Control Unit
31: Interface Module
32: Operational information storage module
33: Main injection check module
34: Post injection execution induction module
35: Pre-injection execution induction module

Claims (9)

A marine engine having a combustion chamber;
A gas fuel supply unit for supplying gas to the combustion chamber;
A fuel supply control unit that controls the above gas fuel supply unit;
A pilot oil injector for injecting ignition pilot oil to ignite the air/gas mixture under a situation where the air/gas mixture is supplied to the combustion chamber;
The fuel supply control unit or the pilot oil injector communicates with the pilot oil injector, and includes a pilot auxiliary injection control unit that allows combustion promoting pilot oil to be injected to promote flame propagation to the combustion chamber before the ignition pilot oil is injected.
A marine engine fuel supply system characterized in that, at a point in time after the ignition pilot oil is injected into the combustion chamber, the pilot oil injector is controlled so that pilot oil for promoting recombustion to recombust unburned gas can be additionally injected into the combustion chamber. In the first paragraph, the pilot auxiliary injection control unit communicates with the fuel supply control unit or the pilot oil injector and includes a main injection check module that checks whether the pilot oil for ignition is injected;
A marine engine fuel supply system characterized by including a pre-injection execution induction module that communicates with the main injection check module and, if it is determined by the main injection check module that the ignition pilot oil is not injected, communicates with the fuel supply control unit or the pilot oil injector to directly or indirectly control the pilot oil injector, thereby inducing the combustion promotion pilot oil to be pre-injected into the combustion chamber before the ignition pilot oil is injected. delete In the second paragraph, the pilot auxiliary injection control unit communicates with the main injection check module, and when the main injection check module determines that the ignition pilot oil has been injected, the pilot oil for ignition is communicated with the fuel supply control unit or the pilot oil injector to directly or indirectly control the pilot oil injector, thereby inducing additional injection of the re-combustion promoting pilot oil into the combustion chamber at a point in time after the ignition pilot oil has been injected. A marine engine fuel supply system characterized in that it further includes a post-injection execution induction module. A marine engine fuel supply system, characterized in that in claim 4, the pilot oil for promoting combustion or the pilot oil for promoting re-combustion is injected multiple times. A step of supplying an air/gas mixture to a combustion chamber of a marine engine;
A step of injecting pilot oil for promoting combustion to promote flame propagation in the combustion chamber;
A step of injecting ignition pilot oil to ignite the air/gas mixture into the combustion chamber;
A method for supplying fuel to a marine engine, characterized in that it comprises a step of additionally injecting pilot oil for promoting recombustion to recombust unburned gas in the combustion chamber. In the sixth paragraph, the step of injecting the pilot oil for promoting combustion includes a step of checking whether the pilot oil for ignition is injected;
A method for supplying fuel to a marine engine, characterized in that it comprises a step of inducing the combustion promoting pilot oil to be pre-injected into the combustion chamber before the ignition pilot oil is injected, if it is determined that the ignition pilot oil is not injected. delete A method for supplying fuel to a marine engine, characterized in that in claim 7, the pilot oil for promoting combustion or the pilot oil for promoting re-combustion is injected multiple times.

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