Highly-integrated electronic control high-pressure common-rail fuel injection system for marine diesel engine

Abstract

The invention belongs to the field of marine engines, and discloses an electric control high-pressure common-rail fuel injection system for a highly-integrated marine diesel engine. Comprising a high-pressure common rail pump, a pump block high-pressure oil pipe, a block rail high-pressure oil pipe, a common rail pipe, a single-cylinder high-pressure oil pipe, a high-pressure extension rod, an oil sprayer, a rail pressure sensor, a mechanical pressure limiting valve, a distribution block, an electric control pressure release valve, a liquid level alarm, an electric control pressure regulating valve and the like. Wherein a mechanical pressure limiting valve, an electric control pressure regulating valve and an electric control pressure release valve are integrated on the distribution block; when the pressure in the high-pressure system is ultrahigh, the mechanical pressure limiting valve is opened to release pressure, and the pressure is kept within the range after being released to the set pressure, so that the safety problem of ultrahigh rail pressure is avoided, and meanwhile, the function of limping home for a ship is met; when the engine needs to be stopped emergently, the electric control pressure release valve is opened to quickly release pressure and cut off oil; when the engine is normally stopped for pressure relief, the electric control pressure regulating valve is opened, and fuel oil in the high-pressure system is discharged.

Description

Technical Field

[0001] This invention relates to the field of marine engines, and in particular to a highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines. Background Technology

[0002] High-pressure common rail electronic fuel injection systems are widely used in the engine field due to their significant advantages such as high efficiency, stability, fuel saving, and environmental friendliness.

[0003] Numerous patents related to electronically controlled high-pressure common rail fuel injection systems have been disclosed in the existing technology, such as CN 202022800155.7, CN201210215913.6, CN202011281032.5, and CN202110680048.1. However, these systems have the following problems: First, when an emergency shutdown is required in special circumstances, the common rail system lacks an independent safety function and cannot quickly depressurize, posing a certain safety hazard. Second, the pipeline design for collecting and alarming abnormal leaks is relatively complex and cannot adequately meet the requirements of marine diesel engines for system simplicity and lightweight design. Third, all abnormal leaks eventually mix together, making it difficult to locate the leak points. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the purpose of this invention is to provide a structure and arrangement of an electronically controlled high-pressure common rail fuel injection system for marine diesel engines. This system features independent safety protection through emergency fuel cut-off; it also features a pressure relief valve to stabilize the engine after excessively high fuel pressure, enabling a limp-home function; it optimizes engine rail pressure following; and it has highly integrated alarm and judgment features for abnormal fuel leakage pipelines. These features ensure the safety, stability, integration, and independent safety protection functions of the fuel system.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention proposes a highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines, comprising an A-side high-pressure common rail pump, a B-side high-pressure common rail pump, an A-side pump block high-pressure fuel line, a B-side pump block high-pressure fuel line, an A-side rail high-pressure fuel line, a B-side rail high-pressure fuel line, an A-side common rail pipe, a B-side common rail pipe, a flow restrictor, a single-cylinder high-pressure fuel line, a high-pressure connector, a static leakage-free injector, a rail pressure sensor, a distributor block, a mechanical pressure relief valve, an electronically controlled pressure relief valve, an electronically controlled pressure regulating valve, and a level alarm; the A-side high-pressure common rail pump is connected to the A-side pump block high-pressure fuel line; the B-side high-pressure common rail pump is connected to... The high-pressure oil pipe of the pump block on side B is connected; the high-pressure oil pipes of the pump block on side A and side B are both connected to the high-pressure oil inlet of the distribution block; the oil outlet of the distribution block is connected to the high-pressure oil pipe of the block rail on side A and side B respectively; the high-pressure oil pipe of the block rail on side A is connected to the common rail on side A; the high-pressure oil pipe of the block rail on side B is connected to the common rail on side B; the common rail on side A and the common rail on side B are each connected to the injectors of each cylinder of the engine through a single-cylinder high-pressure oil pipe and a high-pressure connecting rod; fuel enters the combustion chamber through the single-cylinder high-pressure oil pipe, the high-pressure connecting rod, and the injector to burn and perform work. The distribution block integrates a mechanical pressure limiting valve, an electronically controlled pressure regulating valve, and an electronically controlled pressure relief valve. When the internal pressure of the injection system is too high, the mechanical pressure limiting valve opens to release pressure, maintaining it within the set pressure range to avoid safety issues caused by excessive rail pressure, while also fulfilling the marine limp-home function. When the engine needs to stop urgently, the electronically controlled pressure relief valve opens to quickly release pressure and cut off fuel, achieving an independent safety function. When the engine stops normally, the electronically controlled pressure regulating valve opens to release fuel from the high-pressure system. During normal engine operation, the electronically controlled pressure regulating valve also participates in rail pressure following adjustment.

[0006] As a further technical solution, the distribution block is provided with a main oil passage, two oil inlets, two oil outlets, one pressure limiting oil passage, one pressure regulating oil passage, and one pressure relief channel. The main oil passage is connected to the two oil inlets, two oil outlets, one pressure limiting oil passage, one pressure regulating oil passage, and one pressure relief channel. The two oil inlets are connected to high-pressure oil port d and high-pressure oil port g, and the two oil outlets are connected to high-pressure oil port e and high-pressure oil port f. The pressure limiting oil passage is connected to high-pressure interface a, the pressure regulating oil passage is connected to high-pressure interface b, and the pressure relief channel is connected to high-pressure interface c.

[0007] As a further technical solution, a mechanical pressure relief valve is installed at high-pressure interface a, and an electrically controlled pressure regulating valve is installed at high-pressure interface b; an electrically controlled pressure relief valve is installed at high-pressure oil port c; high-pressure oil port d is connected to the high-pressure oil pipe of pump block A, high-pressure oil port g is connected to the high-pressure oil pipe of pump block B; high-pressure oil port e is connected to the high-pressure oil pipe of block rail A, and high-pressure oil port f is connected to the high-pressure oil pipe of block rail B.

[0008] As a further technical solution, the high-pressure oil port d, high-pressure oil port e, high-pressure oil port f, and high-pressure oil port g are each connected to a corresponding abnormal leakage oil channel.

[0009] As a further technical solution, each abnormal oil leakage channel is equipped with a cartridge-type check valve, which is fixed by a retaining ring to prevent the check valve from moving; each abnormal oil leakage channel is connected to the abnormal oil leakage port, and a liquid level alarm is installed at the location of the abnormal oil leakage port.

[0010] As a further technical solution, a transparent glass stopcock is provided at the end of the abnormal leakage oil passage before the cartridge-type check valve.

[0011] As a further technical solution, the A-side common rail pipe, B-side common rail pipe, A-side pump block high-pressure oil pipe, B-side pump block high-pressure oil pipe, B-side block rail high-pressure oil pipe, A-side block rail high-pressure oil pipe and single-cylinder high-pressure oil pipe are all double-layer pipes; the inner pipe is a fuel pipe and the outer pipe is a protective pipe, and the protective pipe is connected to the abnormal leakage oil channel.

[0012] As a further technical solution, a flow limiting valve is integrated on the oil outlet of each cylinder of the common rail. The flow limiting valve has the function of cutting off fuel when the injector injects excessive fuel. As a further technical solution, rail pressure sensors are integrated on both the A-side common rail pipe and the B-side common rail pipe.

[0013] The beneficial effects of this invention are: After being pressurized by the common rail pump, fuel enters the distribution block via a high-pressure fuel line. It then sequentially passes through the high-pressure fuel line, common rail, flow control valve, high-pressure connector, and injector before entering the combustion chamber for combustion and power generation. The distribution block is equipped with a mechanical pressure relief valve, an electronically controlled pressure relief valve, and an electronically controlled pressure regulating valve. When an abnormality causes the high-pressure fuel pressure to exceed the safety limit, the mechanical pressure relief valve quickly opens to release pressure while maintaining it within a certain range to meet the marine limp-home function. In case of an emergency engine shutdown, pressing the emergency stop button on the monitor quickly opens the electronically controlled pressure relief valve to cut off the fuel supply. The electronically controlled pressure regulating valve participates in the adjustment of rail pressure and provides pressure relief during normal shutdown. In this design, the electronically controlled pressure relief valve provides an independent safety function, while the pressure relief valve and pressure regulating valve ensure the safety and stability of the high-pressure common rail system.

[0014] In this invention, both the common rail and high-pressure oil pipes are double-layered. Correspondingly, a distribution block is machined with an abnormal leakage oil channel. Abnormal leakage oil from all high-pressure interfaces can be collected through this channel at the level alarm installed on the distribution block, and then led out through the abnormal leakage oil outlet. This solves the problem of relatively complex piping design for abnormal leakage oil collection and alarm functions, effectively meeting the requirements of marine diesel engines for system simplicity and lightweight design. The one-way valve integrated within the abnormal leakage oil channel of the distribution block effectively prevents mixing of abnormal leakage oil from different paths, and the transparent glass stopcock on the distribution block effectively identifies leaking oil paths. This arrangement allows for rapid location of abnormal leakage points. Attached Figure Description

[0015] 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 improper limitation of the invention.

[0016] Figure 1 These are schematic flowcharts of some embodiments of the present invention. Figure 2 This is a partial disclosure of the system structure diagram in an embodiment of the present invention; Figure 3 yes Figure 2 Enlarged structural diagram; Figure 4 This is a schematic diagram of the allocation block structure. Figure 1 ; Figure 5 This is a schematic diagram of the allocation block structure. Figure 2 ; Figure 6 This is a schematic diagram of the allocation block structure. Figure 3 ; Figure 7 yes Figure 6 A cross-sectional view of the high-voltage channel at position AA; Figure 8 for Figure 6 Cross-sectional view of the abnormal oil leakage channel at location BB; Figure 9 for Figure 8 Cross-sectional view of the abnormal oil leakage channel at the CC location; The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0017] 1. High-pressure common rail pump on side A; 2. High-pressure common rail pump on side B; 3. High-pressure oil pipe of pump block on side A; 4. Fixed pipe clamp; 5. High-pressure oil pipe of pump block on side B; 6. High-pressure oil pipe of block rail on side B; 7. High-pressure oil pipe of block rail on side A; 8. Common rail pipe on side B; 9. Common rail pipe on side A; 10. Flow limiting valve; 11. Single cylinder high-pressure oil pipe; 12. High-pressure connecting rod; 13. Injector; 14. Rail pressure sensor; 15. Mechanical pressure limiting valve; 16. Distribution block; 17. Electrically controlled pressure relief valve; 18. Liquid level alarm; 19. Electrically controlled pressure regulating valve; 20. Transparent glass stopcock; 21. Screw plug; 22. Cartridge-type check valve; 23. Retaining ring; 16-1 Main oil passage; 16-2 Inlet oil passage; 16-3 Outlet oil passage; 16-4 Pressure limiting oil passage; 16-5 Pressure regulating oil passage; 16-6 Abnormal oil leakage channel; 16-7 Abnormal oil leakage mixing channel; Detailed Implementation It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, the present invention proposes an electronically controlled high-pressure common rail fuel injection system for marine diesel engines. This embodiment discloses an electronically controlled high-pressure common rail fuel injection system for marine diesel engines, including a common rail pump, high-pressure fuel lines, a distributor block, a common rail, a flow restrictor, a high-pressure connector, and a static leak-free injector. The fuel is pressurized by the common rail pump, enters the distributor block through the high-pressure fuel lines, then enters the common rail through the high-pressure fuel lines, and finally passes through the flow restrictor, high-pressure fuel lines, high-pressure connector, and injector into the combustion chamber. A schematic diagram is shown below. Figure 1 As shown.

[0020] Specifically, the distribution block is equipped with high-pressure oil pipes, an electronically controlled pressure relief valve, an electronically controlled pressure regulating valve, and a mechanical pressure limiting valve, all of which are connected to the high-pressure oil circuit. The electronically controlled pressure relief valve has the ability to quickly release pressure upon power failure, fulfilling an independent safety function. The electronically controlled pressure regulating valve participates in rail pressure regulation during normal engine operation, achieving rail pressure following function; it also serves as a pressure relief channel during normal shutdown. The mechanical pressure limiting valve has the function of opening to release pressure when the rail pressure exceeds the limit, and maintaining pressure after releasing to a certain value. This avoids the danger of excessively high engine rail pressure, and the pressure holding function also meets the requirements of the engine's limp-home function.

[0021] A level alarm is installed on the distribution block and connected to the abnormal leakage oil pipeline. All abnormal leakage oil pipelines run inside the distribution block. Abnormal leakage oil occurring at all interfaces within the high-pressure system enters the abnormal leakage oil channel of the distribution block through the double-layer oil pipe sleeve, collects at the level alarm, and is then led out. This design achieves excellent integration, simplification, and lightweight construction. A structural diagram is shown below. Figure 2 As shown.

[0022] The rail pressure sensor is installed on the common rail. For V-type engines, one rail pressure sensor is installed on each of the left and right common rails to achieve redundancy.

[0023] The invention will be further described below with reference to the accompanying drawings and embodiments: like Figure 2 As shown, this embodiment discloses an electronically controlled high-pressure common rail fuel injection system, including an A-side high-pressure common rail pump 1, a B-side high-pressure common rail pump 2, an A-side pump block high-pressure oil pipe 3, a fixed pipe clamp 4, a B-side pump block high-pressure oil pipe 5, a B-side block rail high-pressure oil pipe 6, an A-side block rail high-pressure oil pipe 7, a B-side common rail pipe 8, an A-side common rail pipe 9, a flow limiting valve 10, a single-cylinder high-pressure oil pipe 11, a high-pressure connecting rod 12, an injector 13, a rail pressure sensor 14, a mechanical pressure limiting valve 15, a distribution block 16, an electronically controlled pressure relief valve 17, a liquid level alarm 18, and an electronically controlled pressure regulating valve 19. The A-side high-pressure common rail pump 1 is connected to the A-side pump block high-pressure oil pipe 3; the B-side high-pressure common rail pump 2 is connected to the B-side pump block high-pressure oil pipe 5; the A-side pump block high-pressure oil pipe 3 and the B-side pump block high-pressure oil pipe 5 are both connected to the high-pressure oil inlet of the distribution block 16, and the oil outlet of the distribution block 16 is connected to the A-side block rail high-pressure oil pipe 7 and the B-side block rail high-pressure oil pipe 6, respectively. The A-side block rail high-pressure oil pipe 7 is connected to the A-side common rail pipe 9, and the B-side block rail high-pressure oil pipe 6 is connected to the B-side common rail pipe 8. The A-side common rail pipe 9 and the B-side common rail pipe 8 are each connected to the injector 13 of each cylinder of the engine through the single-cylinder high-pressure oil pipe 11 and the high-pressure connecting rod 12; fuel enters the combustion chamber through the single-cylinder high-pressure oil pipe 11, the high-pressure connecting rod 12, and the injector 13 to burn and do power.

[0024] A flow limiting valve 10 is integrated on the oil outlet of each cylinder in the common rail. The flow limiting valve 10 has the function of cutting off fuel when the injector injects too much fuel. Furthermore, rail pressure sensors 14 are integrated on the common rail pipe 9 on side A and the common rail pipe 8 on side B; Furthermore, this system is suitable for V-type engines. After being pressurized by the high-pressure common rail pump on side A and side B, the fuel enters the distribution block through high-pressure fuel line 3 and high-pressure fuel line 5, and then enters the common rail through the block rail high-pressure fuel line. The common rail has an integrated flow limiting valve at the fuel outlet of each cylinder. The flow limiting valve has the function of cutting off fuel when the injector injects too much fuel. The common rail has an integrated rail pressure sensor. The fuel enters the combustion chamber through the single-cylinder high-pressure fuel line, high-pressure connecting rod, and injector to burn and do power.

[0025] Furthermore, the distribution block 16 integrates a mechanical pressure limiting valve 15, an electrically controlled pressure regulating valve 19, and an electrically controlled pressure relief valve 17. When the pressure in the injection system is too high, the mechanical pressure relief valve 15 opens to release pressure, maintaining it within a certain range after it reaches a certain level, thus avoiding the safety problem of excessive rail pressure and fulfilling the marine limp-home function. When the engine needs to stop urgently, pressing the emergency stop button on the monitor opens the electronically controlled pressure relief valve 17 to quickly release pressure and cut off fuel supply. When the engine stops normally and releases pressure, the electronically controlled pressure regulating valve 19 opens to release fuel from the high-pressure system. During engine operation, the electronically controlled pressure regulating valve 19 can also participate in rail pressure regulation.

[0026] Furthermore, the structure of the allocation block 16 in this embodiment is as follows: Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown in the figure; a mechanical pressure relief valve 15 is installed at the high-pressure interface a position, and an electrically controlled pressure regulating valve 19 is installed at the high-pressure interface b position; an electrically controlled pressure relief valve 17 is installed at the high-pressure oil port c position; the high-pressure oil port d is connected to the high-pressure oil pipe 3 of the pump block on side A, the high-pressure oil port g is connected to the high-pressure oil pipe 5 of the pump block on side B; the high-pressure oil port e is connected to the high-pressure oil pipe 7 of the block rail on side A, and the high-pressure oil port f is connected to the high-pressure oil pipe 6 of the block rail on side B; Furthermore, such as Figure 7As shown, the distribution block 16 is equipped with a main oil passage 16-1, two oil inlet passages 16-2, two oil outlet passages 16-3, a pressure limiting oil passage 16-4, and a pressure regulating oil passage 16-5. The main oil passage 16-1 is connected to the two oil inlet passages 16-2, the two oil outlet passages 16-3, the pressure limiting oil passage 16-4, and the pressure regulating oil passage 16-5. The two oil inlet passages 16-2 are connected to high-pressure oil ports d and g, and the two oil outlet passages 16-3 are connected to high-pressure oil ports e and f. The pressure limiting oil passage 16-4 is connected to high-pressure interface a, and the pressure regulating oil passage 16-5 is connected to high-pressure interface b. The high-pressure oil port c is connected to the main oil passage 16-1. Furthermore, such as Figure 8 , Figure 9 As shown, the high-pressure oil ports d, e, f, and g are each connected to a corresponding abnormal leakage oil channel 16-6 (there are four abnormal leakage oil channels 16-6). Each abnormal leakage oil channel is equipped with a cartridge-type check valve 22 to prevent the leakage oil from different channels from mixing. The cartridge-type check valve 22 is prevented from moving by a retaining ring 23. Each abnormal leakage oil channel is connected to the abnormal leakage oil port through the abnormal leakage oil mixing channel 16-7. A liquid level alarm 18 is installed at the abnormal leakage oil port. The abnormal leakage oil is collected from the high-pressure sealing surface into the abnormal leakage oil channel on the distribution block, then flows through the check valve 22 to the liquid level alarm 23, and then is led out through the abnormal leakage oil port. Furthermore, the function of the high-pressure drain port on the distribution block in the figure is that oil flows out from this port when the electrically controlled pressure relief valve or the electrically controlled pressure regulating valve is opened.

[0027] Furthermore, a transparent glass stopcock 20 is installed at the end of the abnormal leakage oil channel before the cartridge-type check valve 22. When the liquid level alarm 23 alarms, the abnormal leakage can be observed through the transparent glass stopcock, thereby quickly locating and resolving the oil leakage problem. Furthermore, when there is a fuel leak at a high-pressure sealing surface, the leaking oil will travel along the double-layer sleeve, through the abnormal leaking oil channel inside the distribution block, to the level alarm, and then be led out to the fuel tank through the abnormal leaking oil port. Furthermore, in the electronically controlled high-pressure common rail fuel injection system of the present invention, the electronically controlled pressure relief valve 17 and the electronically controlled pressure regulating valve 19 are both controlled by an electronic control unit. The signal collected by the rail pressure sensor 14 is sent to the electronic control unit, which controls each valve to perform corresponding actions based on the signal collected by the rail pressure sensor 14 and the signal input by the external operator.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines, comprising an A-side high-pressure common rail pump, a B-side high-pressure common rail pump, an A-side pump block high-pressure fuel line, a B-side pump block high-pressure fuel line, a B-side rail high-pressure fuel line, an A-side rail high-pressure fuel line, a B-side common rail pipe, an A-side common rail pipe, a flow restrictor valve, a single-cylinder high-pressure fuel line, a high-pressure connector, an injector, a rail pressure sensor, a mechanical pressure relief valve, a distributor block, an electronically controlled pressure relief valve, a level alarm, and an electronically controlled pressure regulating valve; the A-side high-pressure common rail pump is connected to the A-side pump block high-pressure fuel line; the B-side high-pressure common rail pump is connected to the B-side pump block high-pressure fuel line. Oil pipes; the high-pressure oil pipes of the A-side pump block and the B-side pump block are both connected to the high-pressure oil inlet of the distribution block, and the oil outlet of the distribution block is connected to the high-pressure oil pipes of the A-side block rail and the B-side block rail respectively. The high-pressure oil pipes of the A-side block rail are connected to the A-side common rail pipe, and the high-pressure oil pipes of the B-side block rail are connected to the B-side common rail pipe. The A-side common rail pipe and the B-side common rail pipe are each connected to the injectors of each cylinder of the engine through a single-cylinder high-pressure oil pipe and a high-pressure connecting rod; fuel enters the combustion chamber for combustion and power generation through the single-cylinder high-pressure oil pipe, the high-pressure connecting rod, and the injector; its characteristic is: The distribution block integrates a mechanical pressure limiting valve, an electronically controlled pressure regulating valve, and an electronically controlled pressure relief valve. When the pressure in the injection system is too high, the mechanical pressure limiting valve opens to release pressure, and the pressure remains within the set range after being released. When the engine needs to stop urgently, the electronically controlled pressure relief valve opens to quickly release pressure and cut off fuel. When the engine stops normally, the electronically controlled pressure regulating valve opens to release fuel from the high-pressure system. During normal engine operation, the electronically controlled pressure regulating valve also participates in rail pressure following adjustment.

2. The highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines as described in claim 1, characterized in that, The distribution block is equipped with a main oil passage, two oil inlets, two oil outlets, a pressure limiting oil passage, and a pressure regulating oil passage. The main oil passage is connected to the two oil inlets, two oil outlets, a pressure limiting oil passage, and a pressure regulating oil passage. The two oil inlets are connected to high-pressure oil ports d and g, and the two oil outlets are connected to high-pressure oil ports e and f. The pressure limiting oil passage is connected to high-pressure interface a, and the pressure regulating oil passage is connected to high-pressure interface b. The high-pressure oil port c is connected to the main oil passage.

3. The highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines as described in claim 1, characterized in that, A mechanical pressure relief valve is installed at high-pressure interface a, and an electrically controlled pressure regulating valve is installed at high-pressure interface b; an electrically controlled pressure relief valve is installed at high-pressure oil port c; high-pressure oil port d is connected to the high-pressure oil pipe of pump block A, high-pressure oil port g is connected to the high-pressure oil pipe of pump block B; high-pressure oil port e is connected to the high-pressure oil pipe of block rail A, and high-pressure oil port f is connected to the high-pressure oil pipe of block rail B.

4. The highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines as described in claim 1, characterized in that, The high-pressure oil ports d, e, f, and g are each connected to a corresponding abnormal leakage oil channel.

5. The highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines as described in claim 4, characterized in that, Each abnormal oil leakage channel is equipped with a cartridge-type check valve, which is fixed by a retaining ring. Each abnormal oil leakage channel is connected to the abnormal oil leakage port, and a liquid level alarm is installed at the location of the abnormal oil leakage port.

6. The highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines as described in claim 4, characterized in that, A transparent glass stopcock is provided at the end of the abnormal leakage oil passage before the cartridge-type check valve.

7. The highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines as described in claim 1, characterized in that, The A-side common rail pipe, B-side common rail pipe, A-side pump block high-pressure oil pipe, B-side pump block high-pressure oil pipe, B-side block rail high-pressure oil pipe, and A-side block rail high-pressure oil pipe are all double-layered pipes; the inner pipe is a fuel pipe, and the outer pipe is a protective pipe, which is connected to the abnormal leakage oil channel.

8. The highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines as described in claim 1, characterized in that, The common rail inlet to each cylinder has an integrated flow limiting valve at the oil outlet.

9. The highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines as described in claim 1, characterized in that, The common rail pipes on side A and side B are equipped with rail pressure sensors.

10. The highly integrated electronically controlled high-pressure common rail fuel injection system for marine diesel engines as described in claim 1, characterized in that, The injector is a static, leak-free injector.

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