Dual-fuel injection arrangement structure of CNG (compressed natural gas) engine

Abstract

The utility model discloses a dual-fuel injection arrangement structure of a CNG engine, and belongs to the technical field of engines. The cylinder cover is used for distributing some existing CNG vehicle types, the arrangement requirement of the existing vehicle types is met, an existing cylinder cover blank and an intake manifold are kept unchanged, and the development cost is controlled. Comprising an oil rail assembly rail body, an oil sprayer, a CNG gas rail, a CNG rubber pipe and a CNG nozzle. The four oil sprayers are all communicated and installed on the oil rail assembly rail body, the four CNG nozzles are communicated with the CNG gas rail through the four CNG rubber pipes, the oil rail assembly rail body, the four oil sprayers and the four CNG nozzles are all installed on a cylinder cover, and the CNG gas rail is installed on an intake manifold. By means of the arrangement structure, the project requirement for replacing the CNG dual-fuel engine based on an existing vehicle type can be met, meanwhile, the requirements that the CNG dual-fuel engine and a gasoline double-injection engine share the same cylinder cover blank and an intake manifold is not changed can be met, and then the development cost is controlled.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, specifically relating to a dual-fuel injection arrangement structure for a CNG engine. Background Technology

[0002] Currently, most CNG engines adopt a gasoline + CNG dual-fuel injection structure. The CNG injection rail is located on the intake manifold for injection, while the fuel rail assembly is located on the cylinder head for injection. Since some CNG models are developed and designed based on existing dual-injection gasoline engine models with engine replacement, the overall vehicle engine compartment boundary and vehicle structure remain unchanged. Therefore, CNG engine adaptation design is required on the basis of dual-injection engines. Utility Model Content

[0003] The purpose of this utility model is to provide a dual-fuel injection arrangement structure for CNG engines, which is used to match some CNG models. It not only meets the existing model layout requirements, but also keeps the existing cylinder head blank and intake manifold unchanged, thus controlling development costs.

[0004] The technical solution adopted by this utility model is:

[0005] A dual-fuel injection arrangement structure for a CNG engine includes a fuel rail assembly body, fuel injectors, a CNG air rail, CNG hoses, and CNG nozzles; the four fuel injectors are all connected and mounted on the fuel rail assembly body, and the four CNG nozzles are connected to the CNG air rail through four CNG hoses. The fuel rail assembly body, the four fuel injectors, and the four CNG nozzles are all mounted on the cylinder head, and the CNG air rail is mounted on the intake manifold.

[0006] Compared with the prior art, the present invention has the following advantages:

[0007] The arrangement structure of this utility model can meet the project requirements for replacing CNG dual-fuel engines with existing models, and can also meet the requirements that CNG dual-fuel engines and gasoline dual-injection engines share the same cylinder head blank and the intake manifold remains unchanged, thereby controlling development costs. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model;

[0009] Figure 2 This is a schematic diagram of the layout of this utility model;

[0010] The components include: 1. Fuel rail assembly rail body; 2. Fuel rail bracket; 3. Fuel injector; 4. CNG air rail; 5. Air rail bracket; 6. Rail pressure sensor; 7. CNG hose; 8. CNG nozzle; 9. Intake manifold; 10. Cylinder head. Detailed Implementation

[0011] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model will be provided below with reference to the accompanying drawings.

[0012] like Figure 1 , Figure 2 As shown, this utility model provides a dual-fuel injection arrangement structure for a CNG engine, including a fuel rail assembly body 1, injectors 3, a CNG air rail 4, CNG hoses 7, and CNG nozzles 8; the four injectors 3 are all connected and installed on the fuel rail assembly body 1, and the four CNG nozzles 8 are connected to the CNG air rail 4 through four CNG hoses 7. The fuel rail assembly body 1, the four injectors 3, and the four CNG nozzles 8 are all installed on the cylinder head 10, and the CNG air rail 4 is installed on the intake manifold 9.

[0013] The oil rail assembly rail body 1 is mounted onto the cylinder head 10 via the oil rail bracket 2.

[0014] The CNG rail 4 is mounted on the intake manifold 9 via a rail bracket 5.

[0015] A rail pressure sensor 6 is installed on the CNG rail 4.

[0016] The dual-injection fuel rail assembly was changed from eight injectors 3 to four. The eight reserved mounting holes of the corresponding gasoline dual-injection cylinder head blank were machined into four injector mounting holes to install injectors 3, and the remaining four mounting holes were machined into CNG nozzle mounting holes to install CNG nozzles 8.

[0017] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A dual-fuel injection arrangement structure for a CNG engine, characterized in that: It includes a fuel rail assembly body (1), fuel injectors (3), CNG air rail (4), CNG hoses (7) and CNG nozzles (8); the four fuel injectors (3) are all connected and installed on the fuel rail assembly body (1), the four CNG nozzles (8) are connected to the CNG air rail (4) through four CNG hoses (7), the fuel rail assembly body (1), the four fuel injectors (3) and the four CNG nozzles (8) are all installed on the cylinder head (10), and the CNG air rail (4) is installed on the intake manifold (9).

2. The CNG engine dual-fuel injection arrangement structure according to claim 1, characterized in that: The oil rail assembly rail body (1) is mounted onto the cylinder head (10) via an oil rail bracket (2).

3. The CNG engine dual-fuel injection arrangement structure according to claim 1, characterized in that: The CNG rail (4) is arranged on the intake manifold (9) via a rail bracket (5).

4. The CNG engine dual-fuel injection arrangement structure according to claim 1, characterized in that: A rail pressure sensor (6) is installed on the CNG rail (4).

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