KR20230093741A - The system and method that supplies fuel to marine engines - Google Patents

Abstract

The present invention relates to a system and a method for supplying engine fuel for a ship. In the present invention, under the communication infrastructure of an engine controller, a fuel supply control unit, and a pilot oil injector, a <computational module which can induce pre-injection of 'combustion-accelerating pilot oil for accelerating combustion during main combustion' before the injection of ignition pilot oil>, and a <computational module which can induce subsequent additional injection of recombustion-accelerating pilot oil for reburning unburned gas in a combustion chamber under a circumstance where the ignition pilot oil is injected into the combustion chamber and air/gas mixture is being combusted> are arranged/provided systematically, to induce the air/gas mixture supplied into the combustion chamber to be placed in an "improved combustion circumstance by an action of the combustion-accelerating pilot oil pre-injected before the injection of the ignition pilot oil during actual combustion by the ignition action of the ignition pilot oil" or to induce the air/gas mixture to be placed in a "circumstance where unburned gas can be combusted by the action of the recombustion-accelerating pilot oil additionally injected after the injection of the ignition pilot oil following the full combustion by the ignition action of the ignition pilot oil," thereby supporting ship operators, including a shipowner, to effectively avoid issues (e.g., environmental pollution) of harmful/pollutant substances (e.g., methane gas) caused by unburned or incomplete combustion of the air/gas mixture.

Description

Marine engine fuel supply system and method {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 (eg, a dual fuel engine), and more particularly, under a communication infrastructure such as an engine controller, a fuel supply control unit, a pilot oil injector, <pilot oil for ignition At a point in time before injection, 'computation module capable of inducing pre-injection of pilot oil for acceleration of combustion during main combustion', <pilot oil for ignition is injected into the combustion chamber, Under the condition that the gas mixture is combusted, systematically arrange/provide a computer module that can induce additional injection of pilot oil for promoting re-combustion to re-burn unburned gas into the combustion chamber. Through this, on the side of the air/gas mixture supplied to the combustion chamber, during full-scale combustion by the ignition action of the pilot oil for ignition, by the action of the pilot oil for promoting combustion previously injected before the injection of the corresponding pilot oil for ignition , improved combustion environment' or, after full-fledged combustion by the ignition action of the pilot oil for ignition, by the action of additionally injected pilot oil for re-combustion promotion after the injection of the relevant pilot oil for ignition. By inducing them to be in an 'environment in which combustion gases can be re-burned', eventually, on the side of the ship operator, including the ship owner, harmful substances/pollutants (e.g., , methane gas, etc.) is related to a marine engine fuel supply system and method capable of effectively avoiding problems (ie, environmental pollution problems, etc.).

In recent years, as ship-related technologies have made rapid progress, 'fuel supply technology' in preparation for environmental regulations or 'fuel supply technology' that efficiently supplies fuel to ship engines is also undergoing extensive development.

For example, Korean Registered Patent No. 10-2018999 (Name: Piston Engine Operation Method and Piston Engine) (2019.09.06 Announcement), Korean Patent Publication No. 10-2016-41522 (Name: Dual Fuel Engine Combustion start timing balancing device and method through pilot oil injection amount control) (published on April 18, 2016), Republic of Korea Patent Publication No. 10-2017-49926 (title: Pilot oil system test method of dual fuel engine) (May 11, 2017) (published), Korean Patent Publication No. 10-2020-117908 (title: heterogeneous fuel engine) (published on October 14, 2020), Korean Patent Publication No. 10-2008-32948 (title: diesel engine and diesel A pilot natural gas bi-dual combustion system) (published on April 16, 2008) discloses an example of a conventional 'marine engine fuel supply technology' in more detail.

On the other hand, as shown in FIG. 1, under the conventional system, a marine engine fuel supply system 10 for supplying fuel to a marine engine (eg, a dual fuel engine) is provided with a cylinder 17 and a combustion chamber 18 While communicating with the marine engine 16, the marine engine 16, the fuel supply control unit 11, and the like, the engine controller 14 controlling them, and the combustion chamber of the marine engine 16 under the oil fuel supply mode ( 18) an oil fuel supply unit 12 for supplying oil fuel, 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 oil fuel While communicating with the supply unit 12, the gas fuel supply unit 13, etc., for example, depending on the fuel supply mode, the pressurized state of the cylinder 17, the temperature state of the combustion chamber 18, etc., the oil fuel supply unit (12), a fuel supply control unit 11 that controls the gas fuel supply unit 13, etc., so that oil fuel or gas fuel can be selectively supplied into the combustion chamber 18, and a gas fuel supply mode Under the condition, a pilot oil injector 15 for injecting a small amount of pilot oil for ignition into the combustion chamber 18 is systematically combined.

At this time, on the side of the fuel supply control unit 11, under the gas fuel supply mode, under the situation that the air / gas mixture is supplied to the combustion chamber 18 of the marine engine 16 (for reference, air is sucked in the gas fuel supply mode) Under the stroke, after being sucked in through the supercharger, the pressure is boosted to a higher than atmospheric pressure and supplied to the combustion chamber), by controlling the pilot oil injector 15 to be 'minimum compression work/maximum expansion work', the combustion chamber ( 18) A procedure for inducing injection of 'pilot oil for ignition to ignite the air/gas mixture' is carried out.

On the other hand, under such a conventional system, when gas is supplied from the outside of the combustion chamber 18, the gas fuel supply unit 13 side supplies the gas at a low pressure. For reference, when high-pressure injection is to be used, a supply system capable of withstanding high pressure (eg, a compressor, a high-pressure pipe, a high-pressure injection device, etc.) must be additionally designed.

However, as described above, when the air/gas mixture is supplied to the inside of the combustion chamber 18 at a low pressure under the intake stroke, inevitably 'supplied air/gas mixture spreads widely throughout the combustion chamber 18, problems that exist.”

Of course, in this way, under the situation where the air/gas mixture supplied at low pressure is widely spread throughout the combustion chamber 18, ignition is performed by injection of pilot oil for ignition by the pilot oil injector 15, and thus Accordingly, even if a series of combustion proceeds, a serious problem occurs in that a large amount of unburned gas (or incompletely burned gas) remains near the wall of the combustion chamber 18 or in the fine gaps inside the combustion chamber 18. do.

Naturally, after combustion, when a large amount of unburned gas, incomplete combustion gas, etc. remains in the vicinity of the wall surface of the combustion chamber 18 or in the fine gaps inside the combustion chamber 18, the exhaust gas flows through the exhaust pipe 19 in the exhaust stroke. ), the exhaust gas is mixed with harmful substances (e.g., methane gas, etc.), causing serious environmental pollution, and eventually, unless separate measures are taken, the ship operator including the ship owner The side has no choice but to bear various serious damages (eg, damage caused by environmental pollution, property damage due to payment of taxes such as carbon tax, etc.) caused by the toxic substance.

Republic of Korea Patent Registration No. 10-2018999 (Name: Piston Engine Operation Method and Piston Engine) (Announced on September 6, 2019) Republic of Korea Patent Publication No. 10-2016-41522 (Title: Combustion start timing balancing device and method through control of pilot oil injection amount of dual fuel engine) (published on April 18, 2016) Republic of Korea Patent Publication No. 10-2017-49926 (Title: Pilot oil system test method of dual fuel engine) (published on May 11, 2017) Korean Patent Publication No. 10-2020-117908 (name: heterogeneous fuel engine) (published on October 14, 2020) Korean Patent Publication No. 10-2008-32948 (Title: Diesel engine and diesel pilot natural gas bi-dual combustion system) (published on April 16, 2008)

Therefore, an object of the present invention is to provide a communication infrastructure such as an engine controller, a fuel supply control unit, a pilot oil injector, etc. <at the time before ignition pilot oil is injected, during main combustion, a combustion promotion pilot to promote combustion. Computation module capable of inducing 'oil' to be pre-injected>, <Recombustion for re-burning unburned gas into the combustion chamber under the condition that the pilot oil for ignition is injected into the combustion chamber and the air/gas mixture is combusted. Systematically arrange/provide a computer module that can induce pilot oil for acceleration to be additionally injected subsequently, and through this, on the side of the air/gas mixture supplied to the combustion chamber, 'ignition of pilot oil for ignition' In case of full-fledged combustion by the action, by the action of the pilot oil for acceleration of combustion injected in advance before the injection of the corresponding pilot oil for ignition, it is induced to be in an improved combustion environment, After full-fledged combustion by the pilot oil for ignition, by the action of pilot oil for promoting re-combustion additionally injected at the time point after the injection of pilot oil for ignition, it induces the ship to be in an 'environment in which unburned gas can be re-burned'. On the operating entity side, to effectively avoid the problem of generation of harmful substances / pollutants (eg, methane gas, etc.) caused by unburned or incomplete combustion of the air / gas mixture there is.

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

In order to achieve the above object, the present invention includes 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 for injecting pilot oil for ignition to ignite the air/gas mixture when the air/gas mixture is supplied to the combustion chamber; A pilot auxiliary injection that communicates with the fuel supply control unit or the pilot oil injector and allows the pilot oil for promoting combustion to be injected to promote the propagation of flame to the combustion chamber at a point in time before the pilot oil for ignition is injected Disclosed is a marine engine fuel supply system comprising a control unit.

In addition, in another aspect of the present invention, supplying an air / gas mixture to the combustion chamber of the marine engine; injecting pilot oil for promoting combustion to promote the propagation of flame into the combustion chamber; Disclosed is a marine engine fuel supply method comprising the step of injecting ignition pilot oil for igniting the air/gas mixture into the combustion chamber.

In the present invention, under the communication infrastructure of the engine controller, fuel supply control unit, pilot oil injector, etc., <pilot oil for acceleration of combustion during main combustion, prior to injection of pilot oil for ignition> is transmitted in advance. Computational module capable of inducing injection>, <Pilot oil for re-combustion promotion to re-burn unburned gas into the combustion chamber under the condition that the pilot oil for ignition is injected into the combustion chamber and the air/gas mixture is combusted. Since the computer module> etc. that can induce additional injection are systematically arranged/provided, under the implementation environment of the present invention, on the side of the air/gas mixture supplied to the combustion chamber, 'ignition of pilot oil for ignition' In case of full-fledged combustion by the action, it is possible to be in an 'enhanced combustion environment' by the action of the pilot oil for acceleration of combustion injected in advance before the injection of the corresponding pilot oil for ignition, or to be in a full-fledged combustion environment by the 'ignition action of the pilot oil for ignition'. After combustion, it is possible to be in an 'environment in which unburned gas can be re-burned by the action of pilot oil for re-burn promotion additionally injected at the time point after injection of the pilot oil for ignition. On the side of the ship operator, it is possible to effectively avoid problems (ie, environmental pollution problems, etc.) of harmful substances/pollutants (eg, methane gas, etc.) caused by unburned or incomplete combustion of the air/gas mixture.

1 is an exemplary view conceptually showing a detailed configuration of a marine engine fuel supply system according to the prior art.
Figure 2 is an exemplary view conceptually showing the detailed configuration of the marine engine fuel supply system according to the present invention.
3 is an exemplary diagram conceptually illustrating a detailed configuration of a pilot auxiliary injection control unit according to the present invention;
4 is an exemplary diagram conceptually illustrating a detailed operation execution procedure of a pilot auxiliary injection control unit according to the present invention;

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

As shown in Figure 2, under the framework of the present invention,

A marine engine fuel supply system 20 for supplying fuel to a marine engine (eg, a dual fuel engine) includes a marine engine 26 having a cylinder 17 and a combustion chamber 28, a marine engine 26, and fuel supply. An engine controller 24 that controls them while communicating with the control unit 21, etc., and an oil fuel supply unit 22 that supplies oil fuel to the combustion chamber 28 of the marine engine 26 under the oil fuel supply mode And, under the gas fuel supply mode, the gas fuel supply unit 23 for supplying gas fuel to the combustion chamber 28 of the marine engine 26, the oil fuel supply unit 22, the gas fuel supply unit 23, etc. communicate While taking, for example, the oil fuel supply unit 22, the gas fuel supply unit 23, etc. are controlled according to the fuel supply mode, the pressure state of the cylinder 27, the temperature state of the combustion chamber 28, etc. , a fuel supply control unit 21 for inducing oil fuel or gas fuel to be selectively supplied into the combustion chamber 28, and a small amount of pilot oil for ignition into the combustion chamber 28 under the gas fuel supply mode. The pilot oil injector 25 and the like that inject the system are systematically combined.

At this time, on the side of the fuel supply control unit 21, under the gas fuel supply mode, under the condition that the air / gas mixture is supplied to the combustion chamber 28 of the marine engine 26 (for reference, air is sucked in the gas fuel supply mode) Under the stroke, after being sucked in through the supercharger, the pressure is boosted to a higher than atmospheric pressure and supplied to the combustion chamber), by controlling the pilot oil injector 25 to be 'minimum compression work/maximum expansion work', the combustion chamber ( 28) A procedure for inducing injection of 'pilot oil for ignition to ignite the air/gas mixture' is carried out.

On the other hand, even under the system of the present invention, when gas is supplied from the outside of the combustion chamber 28, the gas fuel supply unit 23 side supplies the gas at a low pressure.

However, when the air/gas mixture is supplied to the inside of the combustion chamber 28 at a low pressure under the intake stroke, there is an inevitably 'problem that the supplied air/gas mixture is widely spread throughout the combustion chamber 28'. It happens.

Of course, under a situation where the air/gas mixture supplied at a low pressure is widely spread throughout the combustion chamber 28, ignition is performed by injection of pilot oil for ignition by the pilot oil injector 25, and thus Accordingly, even if a series of combustion proceeds, a serious problem occurs in that a large amount of unburned gas (or incompletely burned gas) remains near the wall of the combustion chamber 28 or in the fine gaps inside the combustion chamber 28. do.

Naturally, when a large amount of unburned gas, incomplete combustion gas, etc. remains in the vicinity of the wall surface inside the combustion chamber 28 or in the fine gaps inside the combustion chamber 28 after combustion, the exhaust gas flows through the exhaust pipe 29 in the exhaust stroke. ), the exhaust gas is mixed with harmful substances (e.g., methane gas, etc.), causing serious environmental pollution, and eventually, unless separate measures are taken, the ship operator including the ship owner The side has no choice but to bear various serious damages (eg, damage caused by environmental pollution, property damage due to payment of taxes such as carbon tax, etc.) caused by the toxic substance.

Under such a sensitive situation, as shown in FIG. 2, in the present invention, under the communication infrastructure such as the engine controller 24, the fuel supply control unit 21, and the pilot oil injector 25, pilot auxiliary injection control unique to the present invention Measures to additionally dispose the unit 30 are taken. 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 circumstances.

At this time, the side of 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., before the pilot oil for ignition is injected. At this point, it plays a role of inducing injection of pilot oil for promoting combustion to promote the propagation of flame into the combustion chamber 28 (or to improve the combustion environment).

In addition, on the side of the pilot auxiliary injection control unit 30 of the present invention, pilot oil for ignition is injected into the combustion chamber 28, and under a situation where the air/gas mixture is combusted, the fuel supply control unit 21, By communicating with the pilot oil injector 25 and the like and directly or indirectly controlling the pilot oil injector 25, pilot oil for promoting re-burning for re-burning unburned gas into the combustion chamber 28 is additionally injected. will play a guiding role.

In this case, as shown in FIG. 3 , the pilot auxiliary injection control unit 30 according to the present invention transmits the engine controller 24, the fuel supply control unit 21, and the pilot oil via the interface module 31. The operation information storage module 32 communicating with the injector 25, the main injection check module 33, the pre-injection execution induction module 35, the post injection execution induction module 34, etc. are closely combined. will do

At this time, the operation information storage module 32 side registers the registration information of the engine controller 24, the registration information of the fuel supply control unit 21, the registration information of the pilot oil injector 25, and the formation of a communication session in its own information storage area. By storing/managing program source information for maintenance, program source information for performing functions of computational modules, etc., the pilot auxiliary injection procedure according to the present invention (e.g., a pre-injection procedure of pilot oil for combustion promotion, re-combustion promotion) It plays a role of supporting so that the pilot oil post-injection procedure, etc.) can proceed normally without any problems.

In addition, the main injection check module 33 side communicates with the engine controller 24, the fuel supply control unit 21, the pilot oil injector 25, etc. through the interface module 31, for example, 'combustion chamber (28) temperature state'. 'The angle of the crankshaft of the cylinder 27' and the 'injection state of the pilot oil injector 25' are checked, and through this, whether or not the pilot oil for ignition is injected (ie, 'whether the main injection is executed') is determined. You will go through the checking process.

In addition, when the pre-injection execution guidance module 35 communicates with the main injection check module 33 and determines that the pilot oil for ignition is not injected by the main injection check module 33, the fuel supply control By communicating with the unit 21, the pilot oil injector 25, etc., and directly or indirectly controlling the pilot oil injector 25, as shown in FIG. 4, at a point in time before the pilot oil for ignition is injected. (That is, at a point in time before execution of 'main injection'), a procedure for inducing pilot oil for combustion promotion to be pre-injected into the combustion chamber 28 (ie, a procedure for inducing 'pre-injection' to be executed) will proceed

Furthermore, on the side of the post injection execution guidance module 34, while communicating with the main injection check module 32, if it is confirmed/determined that the pilot oil for ignition has been injected by the main injection check module 33, the By communicating with the pilot oil injector 25 or the fuel supply control unit 21 and directly or indirectly controlling the pilot oil injector 25, as shown in FIG. 4, the pilot oil for ignition is injected. At a later time point (ie, at a time point after execution of 'main injection'), a procedure for inducing additional injection of the pilot oil for promoting re-combustion into the combustion chamber 28 (ie, 'after injection' so that 'after injection' can be executed) process of induction).

In short, in the present invention, <step of supplying gas (or air/gas mixture) to the combustion chamber 28 of the marine engine 26>, <pilot for promoting combustion to promote the propagation of flame to the combustion chamber 28 Injecting oil (pre-injection step)>, <Injecting pilot oil for ignition to ignite the air/gas mixture into the combustion chamber 28 (main injection step)>, <Pilot oil for ignition A step of additionally injecting pilot oil for re-combustion promotion, which is injected into the combustion chamber 28 and re-burns unburned gas into the combustion chamber under the condition that the air/gas mixture is combusted (post-injection step)>, etc. As a result, the marine engine fuel supply method will be newly improved/implemented.

At this time, in the present invention, pilot oil for promoting combustion or pilot oil for promoting re-combustion may be injected multiple times according to circumstances (eg, according to the capacity of the engine, the size of the combustion chamber, the supply amount of the air/gas mixture, etc.) That is, in the 'pre-injection step', the pilot oil for promoting combustion may be injected twice or more, and in the 'post-injection step', the pilot oil for promoting re-combustion may be injected two or more times).

At this time, since the pilot oil for combustion promotion supplied under the pre-injection step has a lower ignition temperature than that of air/gas, when the pilot oil for combustion promotion is pre-mixed with air/gas prior to injection of the pilot oil for ignition. , On the air/gas side, when the full-scale combustion procedure proceeds, it can be placed in an environment in which flame propagation is greatly promoted (ie, an improved combustion environment), and eventually, the combustion chamber 28 with a high possibility of quenching and incomplete combustion Combustion of the end portion and interstitial volume is greatly improved, so that noxious substances/pollutants (eg, methane gas, etc.) are generated in the exhaust stroke, even when the exhaust gas is discharged to the exhaust pipe 29.

In addition, the pilot oil for promoting re-combustion supplied under the post-injection step reliably performs the function of once again burning 'unburned/incompletely burned air/gas' placed in the distal end of the combustion chamber 28 and the interstitial volume. Even in this case, in the exhaust stroke, even when the exhaust gas is discharged to the exhaust pipe 29, harmful substances/pollutants (eg, methane gas, etc.) are not generated.

As described above, in the present invention, under the communication infrastructure such as the engine controller, fuel supply control unit, and pilot oil injector, <at the time before the pilot oil for ignition is injected, 'pilot oil for acceleration of combustion to promote combustion during main combustion' 'Computation module capable of inducing pre-injection of fuel', <Pilot oil for ignition is injected into the combustion chamber to promote re-combustion to re-burn unburned gas into the combustion chamber under the condition that the air/gas mixture is burned. Since a computer module capable of inducing additional injection of pilot oil for subsequent injection> is systematically arranged/provided, under the implementation environment of the present invention, on the side of the air/gas mixture supplied to the combustion chamber, 'pilot for ignition' During full-scale combustion by the ignition action of oil, by the action of the pilot oil for acceleration of combustion injected in advance before the injection of the corresponding pilot oil for ignition, it is possible to be in an 'enhanced combustion environment' or 'ignition action of the pilot oil for ignition' After full-fledged combustion by , it is possible to be in an 'environment in which unburned gas can be re-burned by the action of additionally injected pilot oil for re-burn promotion at a time point after the injection of the ignition pilot oil, and eventually, Ship operators, including ship owners, can effectively avoid problems (ie, environmental pollution problems, etc.) there will be

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

The present invention exhibits generally useful effects in various fields requiring efficient blocking of engine-side contaminants.

And, in the foregoing, although specific embodiments of the present invention have been described and illustrated, it is obvious that the present invention is likely to be practiced with various modifications by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit 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 engine
17,27: Cylinder
18,28: combustion chamber
19,29: Exhaust pipe
30: pilot auxiliary injection control unit
31: interface module
32: operation 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 supplying gas to the combustion chamber;
a fuel supply control unit controlling the gas fuel supply unit;
a pilot oil injector for injecting pilot oil for ignition to ignite the air/gas mixture when the air/gas mixture is supplied to the combustion chamber;
A pilot auxiliary injection that communicates with the fuel supply control unit or the pilot oil injector and allows the pilot oil for promoting combustion to be injected to promote the propagation of flame to the combustion chamber at a point in time before the pilot oil for ignition is injected Marine engine fuel supply system comprising a control unit. The fuel injection control unit of claim 1 , wherein the pilot auxiliary injection control unit comprises: a main injection check module which communicates with the fuel supply control unit or the pilot oil injector and checks whether or not the pilot oil for ignition is injected;
It communicates with the main injection check module, and when it is determined that the pilot oil for ignition is not injected by the main injection check module, it communicates with the fuel supply control unit or pilot oil injector to directly or indirectly operate the pilot oil injector. and a pre-injection execution guidance module for inducing the pre-injection of the pilot oil for acceleration of combustion into the combustion chamber at a point in time before the pilot oil for ignition is injected by controlling with . 3. The method of claim 2 , wherein the pilot auxiliary injection control unit side communicates with the fuel supply control unit or the pilot oil injector under a situation in which the pilot oil for ignition is injected into the combustion chamber and the air/gas mixture is combusted, The marine engine fuel supply system, characterized in that by directly or indirectly controlling the pilot oil injector, pilot oil for promoting re-burning for re-burning unburned gas can be additionally injected into the combustion chamber. 4. The method of claim 3 , wherein the pilot auxiliary injection control unit communicates with the main injection check module, and when it is determined that the pilot oil for ignition is injected by the main injection check module, the fuel supply control unit or the pilot oil injector Direct or indirect control of the pilot oil injector by communicating with the pilot oil injector, so that the pilot oil for re-combustion is additionally injected into the combustion chamber at a time point after the pilot oil for ignition is injected, leading to subsequent injection execution Marine engine fuel supply system further comprising a module. 5. The marine engine fuel supply system according to claim 4, wherein the pilot oil for accelerating combustion or the pilot oil for accelerating re-combustion is injected multiple times. supplying an air/gas mixture to a combustion chamber of a marine engine;
injecting pilot oil for promoting combustion to promote the propagation of flame into the combustion chamber;
and injecting pilot oil for ignition to ignite the air/gas mixture into the combustion chamber. 7. The method of claim 6, wherein the injection of the pilot oil for acceleration of combustion comprises: checking whether or not the pilot oil for ignition is injected;
and inducing the pilot oil for acceleration of combustion to be pre-injected into the combustion chamber at a time point before the pilot oil for ignition is injected when it is determined that the pilot oil for ignition is not injected. Marine engine fuel supply method. 7. The method of claim 6 , wherein the pilot oil for ignition is injected into the combustion chamber, and under a situation where the air/gas mixture is combusted, pilot oil for re-combustion promotion for re-burning unburned gas is additionally injected into the combustion chamber. Marine engine fuel supply method, characterized in that the step of doing further proceeds. 9. The method of claim 8, wherein the pilot oil for promoting combustion or the pilot oil for promoting re-combustion is injected multiple times.

Images