Side oil inlet and side oil return type high-voltage electronic control common rail oil injection system of diesel engine

Abstract

The invention discloses a side oil inlet and side oil return type high-pressure electronic control common rail oil injection system of a diesel engine. The system comprises a whole vehicle part frame, a frame cross beam, a frame partition plate, a high-pressure common rail oil injector, an oil inlet pipeline system and an oil return pipeline system. The high-pressure common-rail fuel injector comprises a fuel injector body, and an electric control binding post, an electric control connecting rod, an electric control connecting rod and an electric control connecting rod which are integrally arranged on the same side face of the fuel injector body, the side oil inlet connector is used for connecting high-pressure fuel oil; the side oil return joint is used for discharging redundant fuel oil; the oil inlet pipeline system comprises a high-pressure oil pump, a first high-pressure oil pipe assembly, a common rail pipe and a second high-pressure oil pipe assembly which are sequentially connected, and the tail end of the second high-pressure oil pipe assembly is connected to the side oil inlet connector. The oil inlet interface, the oil return interface and the electric control interface are all integrated on the side face of the oil injector body, so that the overall dimension of the oil injector in the vertical direction is fundamentally reduced.

Description

Technical Field

[0001] This invention relates to the technical field of diesel engines, and more particularly to a side-inlet, side-return high-pressure electronically controlled common rail injection system for diesel engines. Background Technology

[0002] With the continuous upgrading of modern agriculture, farmers have an increasingly urgent need for high-efficiency and high-performance machinery to cope with the increasingly complex farming environment. At the same time, the combination of paddy field machinery cooperatives and land transfer has given rise to many large-scale paddy field growers.

[0003] Against this backdrop, the application rate of four-wheel drive riding-type high-speed rice transplanters has steadily increased, effectively promoting the serialization and diversification of rice transplanter products in my country's agricultural machinery market. Traditional high-pressure common rail injectors are relatively large, resulting in a higher overall engine height.

[0004] This invention is a high-pressure electronically controlled common rail injector with a side-inlet and side-return oil type, designed to meet the specific requirements of a rice transplanter for engine height. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the side-inlet, side-return high-pressure electronically controlled common rail injection system of diesel engines, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a side-inlet, side-return high-pressure electronically controlled common rail injection system for diesel engines, which fundamentally reduces the vertical profile dimensions of the injector by integrating the oil inlet, oil return, and electronic control interfaces all on the side of the injector body.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a side-inlet, side-return high-pressure electronically controlled common rail injection system for a diesel engine, comprising: The vehicle consists of the frame, frame crossbeams, frame bulkheads, high-pressure common rail injectors, fuel inlet piping system, and fuel return piping system. The high-pressure common rail injector includes an injector body and an integrated component on the same side of the injector body: Electronic control terminals are used to connect the engine wiring harness to receive control signals; Side fuel inlet connector for connecting high-pressure fuel; Side return oil connector, used to drain excess fuel; The oil inlet pipeline system includes a high-pressure oil pump, a first high-pressure oil pipe assembly, a common rail pipe, and a second high-pressure oil pipe assembly connected in sequence, with the end of the second high-pressure oil pipe assembly connected to the side inlet connector. The return oil pipeline system includes an injector return oil connector, a return oil tee, an injector return oil pipe, and an injection pump return oil connector connected in sequence, and the injector return oil connector is connected to the side return oil connector.

[0009] As a preferred embodiment of the side-inlet, side-return high-pressure electronically controlled common rail injection system for the diesel engine described in this invention, wherein the highest point of the high-pressure common rail injector is a terminal block installed above its electronically controlled terminal.

[0010] As a preferred embodiment of the side-inlet, side-return high-pressure electronically controlled common rail injection system for the diesel engine described in this invention, the overall height of the high-pressure common rail injector is configured such that, when installed on the engine, its highest point has an anti-interference gap with the adjacent frame crossbeam or frame bulkhead in the engine compartment.

[0011] As a preferred embodiment of the side-inlet and side-return high-pressure electronically controlled common rail injection system for the diesel engine described in this invention, wherein the side inlet connector and the side return connector are arranged vertically on the same side of the injector body.

[0012] A side-inlet, side-return high-pressure electronically controlled common rail injector includes: Injector body; The injector body is integrated with the following on the same outer side wall: Electrical control terminals are used to connect external control harnesses; The oil inlet port is connected to a side oil inlet connector; The oil return port is connected to a side oil return connector. The layout of the electronic control terminal, the side oil inlet connector, and the side oil return connector together constitutes the highest point of the outer contour of the injector, and this highest point is located on the upper side of the injector body.

[0013] As a preferred embodiment of the side-inlet, side-return high-pressure electronically controlled common rail injector of the present invention, wherein: an outwardly extending terminal partition is provided above the electronically controlled terminal, and the terminal partition constitutes the highest point of the outer contour of the injector.

[0014] As a preferred embodiment of the side-inlet and side-return high-pressure electronically controlled common rail injector of the present invention, wherein: the central axes of the side inlet connector and the side return connector are parallel to each other and are both perpendicular to the central axis of the injector body.

[0015] A diesel engine includes a high-pressure electronically controlled common rail injector with side inlet and side return of fuel, wherein the injector is mounted on the engine cylinder head and the side of the injector having a connector and a terminal block faces the empty side space in the engine compartment.

[0016] The beneficial effects of this invention are: significantly reducing the installation height of the engine assembly and completely avoiding spatial interference: The most core and direct benefit of this solution lies in the fact that by integrating the oil inlet, oil return, and electronic control interfaces all on the side of the injector body, the vertical profile dimensions of the injector are fundamentally reduced. This allows for a reduction in the overall height of the engine assembly after installation on the engine cylinder head, thus enabling sufficient safety clearance between the injector and the upper frame beams, partitions, and other structures in vehicles with strict limitations on vertical space in the engine compartment, such as high-speed rice transplanters. This completely solves the physical interference problem of traditional top-return injectors and allows for the smooth installation of the powertrain in a compact space. Optimized pipeline layout improves assembly efficiency and reliability: The laterally centralized interface layout makes it easier to plan and uniformly arrange the routing of high-pressure oil pipes, return oil pipes, and electronic control wiring harnesses. All connections are made from the side of the injectors, avoiding crowded and crisscrossing pipeline layouts on top of the injectors. This not only makes the engine compartment layout neater and more orderly but also significantly reduces assembly difficulty and error rates, improving production assembly efficiency. At the same time, the clear pipeline paths facilitate subsequent inspection and maintenance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of the side-inlet, side-return high-pressure electronically controlled common rail injection system for the diesel engine of the present invention.

[0018] Figure 2 This is a schematic diagram showing the arrangement of the side-inlet, side-return high-pressure electronically controlled common rail injection system of the diesel engine of the present invention in the engine compartment of the vehicle. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0022] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0023] Reference Figures 1-2 A side-inlet, side-return high-pressure electronically controlled common rail injection system for a diesel engine is provided, comprising: The vehicle consists of the following components: frame 1, frame crossbeam 1.1, frame bulkhead 1.2, high-pressure common rail injector 2, oil inlet pipeline system 3, and oil return pipeline system 4. The high-pressure common rail injector 2 includes an injector body and a component integrated on the same side of the injector body: Electrical control terminal 2.2 is used to connect the engine wiring harness to receive control signals; Side fuel inlet connector 2.3, used for connecting high-pressure fuel; Side return oil connector 2.4, used to drain excess fuel; The oil inlet pipeline system 3 includes a high-pressure oil pump 3.3, a first high-pressure oil pipe assembly 3.4, a common rail 3.2, and a second high-pressure oil pipe assembly 3.1 connected in sequence. The end of the second high-pressure oil pipe assembly 3.1 is connected to the side oil inlet connector 2.3. The return oil pipeline system 4 includes an injector return oil connector 4.1, a return oil tee 4.2, an injector return oil pipe 4.3, and an injection pump return oil connector 4.4 connected in sequence. The injector return oil connector 4.1 is connected to the side return oil connector 2.4.

[0024] The highest point of the high-pressure common rail injector 2 is the terminal block 2.1 located above its electronic control terminal 2.2. Specifically, the overall height of the high-pressure common rail injector 2 is configured such that when installed on the engine, there is an anti-interference gap between its highest point and the adjacent frame beam 1.1 or frame block 1.2 in the engine compartment. The side oil inlet connector 2.3 and the side oil return connector 2.4 are arranged vertically on the same side of the injector body.

[0025] One type of side-inlet, side-return high-pressure electronically controlled common rail injector includes: Injector body; The following are integrated on the same outer side wall of the injector body: Electrical control terminal 2.2 is used for connecting external control wiring harnesses; The oil inlet port is connected to a side oil inlet connector 2.3; The oil return port is connected to a side oil return connector 2.4; The layout of the electronic control terminal 2.2, the side oil inlet connector 2.3, and the side oil return connector 2.4 together constitutes the highest point of the outer contour of the injector, and this highest point is located on the upper side of the injector body.

[0026] Specifically, an outwardly extending terminal block 2.1 is provided above the electronic control terminal 2.2. This terminal block 2.1 forms the highest point of the outer contour of the injector. The central axes of the side oil inlet connector 2.3 and the side oil return connector 2.4 are parallel to each other and are both perpendicular to the central axis of the injector body.

[0027] The entire system operates according to the basic principles of high-pressure common rail technology: a high-pressure fuel pump pressurizes the fuel and stores it in the common rail; the ECU issues commands based on engine operating conditions to control the opening of the injector solenoid valve, allowing high-pressure fuel to be injected into the cylinder. The core improvement of this invention lies in the external interface layout of the injector body and the resulting optimization of the overall vehicle layout.

[0028] Its working principle chain can be summarized as follows: "Lateral layout reduces overall height" → "Avoids chassis interference" → "Enables smooth vehicle mounting" → "Maintains full functionality of the common rail system".

[0029] Detailed working principles of each subsystem 1. The fuel supply and injection subsystem corresponds to the core functions of the fuel inlet pipeline system and injector in claim 1. High-pressure establishment and storage: The high-pressure fuel pump 3.3 operates continuously, pressurizing the diesel fuel from the fuel tank to the high pressure required by the common rail system, typically above 100 MPa. The high-pressure fuel is then delivered to the common rail 3.2 via the first high-pressure fuel line assembly 3.4. The common rail, acting as a common accumulator, eliminates fuel pressure fluctuations, providing a stable and uniform high-pressure fuel source for all injectors.

[0030] Lateral fuel supply: High-pressure fuel stored in the common rail 3.2 is guided through the second high-pressure fuel line assembly 3.1 to the side inlet connector 2.3 on the side of the injector body. Compared with conventional top or middle inlets, this lateral interface reduces the space required above the injector for fuel line routing.

[0031] Precise Metering and Injection: After high-pressure fuel enters the injector, its injection process is precisely controlled by the electronic control system. When injection is not required, the solenoid valve inside the injector is closed, the control chamber maintains high pressure, and the injector needle valve is tightly closed. When the ECU issues an injection command, current flows through the electronic control terminal 2.2 to drive the solenoid valve to open rapidly, releasing the high-pressure fuel in the control chamber. Under the action of the high-pressure fuel in the fuel reservoir, the needle valve quickly lifts, and the fuel is injected into the engine combustion chamber in an atomized state through the injection hole. After the solenoid valve closes, the pressure in the control chamber is rebuilt, the needle valve sits down, and the injection ends. This internal working process is consistent with that of a conventional common rail injector; this invention does not change its internal precision control logic.

[0032] 2. Fuel return subsystem Lateral recovery of leaked fuel: During the operation of the injector, a small amount of fuel will be discharged as leaked oil to ensure the lubrication and cooling of the solenoid valve and needle valve assembly. This invention arranges the outlet-side return connector 2.4 for this leaked oil along with the inlet connector on the same side of the injector body. After flowing out from the side return connector 2.4, the leaked oil enters the return tee 4.2 via the injector return connector 4.1.

[0033] Fuel return collection and return: Fuel return from each cylinder injector collects at the return tee, is guided through the injector return pipe 4.3 to the fuel injection pump return connector 4.4, and finally connects to the vehicle's low-pressure return line, returning to the fuel tank. The lateral return design avoids the need for a return pipe on top of the injector, which is one of the keys to reducing the overall injector profile height H.

[0034] 3. Electrical Control and Layout Optimization Subsystem Lateral connection of electronic control signals: The electronic control terminal 2.2 is also located on the side of the injector, and the engine wiring harness connects to it from the side to receive pulse signals sent by the ECU. The traditional top-mounted connector significantly increases the height of the injector. This invention changes it to a lateral arrangement, and provides protection and isolation through the partition 2.1 in the middle of the terminal, which forms the highest point of the injector's outer contour. Even so, this highest point is much lower than in the conventional structure due to the lateral shift of the inlet and return oil interfaces.

[0035] The principle behind achieving space avoidance is as follows: By "translating" all three external interfaces—fuel inlet, fuel return, and electronic control—to the side of the injector body, the injector's projected dimension in the Z-direction of the engine, i.e., its total height, is reduced to the maximum extent. When this injector is installed on the engine cylinder head and placed in the vehicle's engine compartment, its significantly lowered top profile naturally forms sufficient anti-interference clearance with the upper frame crossbeam 1.1 and frame bulkhead 1.2. This directly solves the technical problem in the background technology of "injector interfering with the frame boundary, making it impossible to install smoothly."

[0036] Maintaining Functionality and Reliability: Throughout the entire operation, the laterally arranged interfaces only change the direction and position of the external connections, without altering high-pressure seals such as the metal seal at the side inlet joint, the electrical performance of the electronic control signal transmission, or the hydraulic characteristics of the return oil flow. Therefore, the injector's injection performance, response speed, and reliability are fully preserved.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A side-inlet, side-return high-pressure electronically controlled common rail injection system for a diesel engine, characterized in that, include: The vehicle consists of a frame (1), frame crossbeams (1.1), frame partitions (1.2), high-pressure common rail injectors (2), inlet pipeline system (3), and return pipeline system (4). The high-pressure common rail injector (2) includes an injector body and an integrated component disposed on the same side of the injector body: The electronic control terminal (2.2) is used to connect the engine wiring harness to receive control signals; Side fuel inlet connector (2.3) is used to connect high-pressure fuel; Side return oil connector (2.4) is used to drain excess fuel; The oil inlet pipeline system (3) includes a high-pressure oil pump (3.3), a first high-pressure oil pipe assembly (3.4), a common rail (3.2), and a second high-pressure oil pipe assembly (3.1) connected in sequence. The end of the second high-pressure oil pipe assembly (3.1) is connected to the side oil inlet connector (2.3). The return oil pipeline system (4) includes an injector return oil connector (4.1), a return oil tee (4.2), an injector return oil pipe (4.3), and an injection pump return oil connector (4.4) connected in sequence. The injector return oil connector (4.1) is connected to the side return oil connector (2.4).

2. The side-inlet, side-return high-pressure electronically controlled common rail injection system for a diesel engine according to claim 1, characterized in that: The highest point of the high-pressure common rail injector (2) is the terminal block (2.1) installed above its electronic control terminal (2.2).

3. The side-inlet, side-return high-pressure electronically controlled common rail injection system for a diesel engine according to claim 2, characterized in that: The overall height of the high-pressure common rail injector (2) is configured such that when it is installed on the engine, there is an anti-interference gap between its highest point and the adjacent frame crossbeam (1.1) or frame bulkhead (1.2) in the engine compartment.

4. The side-inlet, side-return high-pressure electronically controlled common rail injection system for a diesel engine according to claim 3, characterized in that: The side oil inlet connector (2.3) and the side oil return connector (2.4) are arranged vertically on the same side of the injector body.

5. A side-inlet, side-return type high-pressure electronically controlled common rail injector, characterized in that, include: Injector body; The injector body is integrated with the following on the same outer side wall: Electrical control terminal (2.2), which is used for connecting external control harnesses; Oil inlet port, which is connected to a side oil inlet connector (2.3). The return oil interface is connected to a side return oil connector (2.4). The layout of the electronic control terminal (2.2), the side oil inlet connector (2.3), and the side oil return connector (2.4) together constitutes the highest point of the outer contour of the injector, and the highest point is located on the upper side of the injector body.

6. The side-inlet, side-return high-pressure electronically controlled common rail injector according to claim 5, characterized in that: Above the electronic control terminal (2.2) is an outwardly extending terminal partition (2.1), which forms the highest point of the outer contour of the injector.

7. The side-inlet, side-return high-pressure electronically controlled common rail injector according to claim 5, characterized in that: The central axes of the side oil inlet connector (2.3) and the side oil return connector (2.4) are parallel to each other and are both perpendicular to the central axis of the injector body.

8. A diesel engine, characterized in that, It includes an engine body and at least one side-inlet, side-return high-pressure electronically controlled common rail injector as described in any one of claims 5 to 7, the injector being mounted on the engine cylinder head, and the side of it having a connector and a terminal block facing the empty side space in the engine compartment.

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