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

Abstract

The invention 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 requirement 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] The invention belongs to the technical field of engines, and in particular relates to a dual-fuel injection arrangement structure of a CNG engine. Background Art

[0002] At present, most CNG engines adopt a gasoline + CNG dual fuel injection structure. The CNG injection rail is arranged on the intake manifold for injection, and the oil rail assembly is arranged on the cylinder head for airway injection. Since some CNG models are developed and designed based on the existing dual-injection gasoline engine models, the vehicle cabin boundaries and vehicle structure remain unchanged, it is necessary to adapt the CNG engine design based on the dual-injection engine. Summary of the invention

[0003] The purpose of the present invention is to provide a CNG engine dual fuel injection arrangement structure, which is used to match some existing CNG models, not only meeting the layout requirements of existing models, but also keeping the existing cylinder head blank and intake manifold unchanged, thereby controlling the development cost.

[0004] The technical solution adopted by the present invention is:

[0005] A dual-fuel injection arrangement structure of a CNG engine comprises an oil rail assembly body, an injector, a CNG air rail, a CNG hose and a CNG nozzle; four injectors are connected to and mounted on the oil rail assembly body, four CNG nozzles are connected to the CNG air rail through four CNG hoses, the oil rail assembly body, four injectors and four CNG nozzles are all mounted on a cylinder head, and the CNG air rail is mounted on an intake manifold.

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

[0007] The arrangement structure of the present invention can meet the project requirements of replacing the CNG dual-fuel engine based on the existing vehicle model, and can also meet the requirements that the CNG dual-fuel engine and the gasoline dual-injection engine share the same cylinder head blank and the intake manifold remains unchanged, thereby controlling the development cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the present invention;

[0009] Figure 2 It is a schematic diagram of the arrangement of the present invention;

[0010] Among them: 1. Fuel rail assembly rail body; 2. Fuel rail bracket; 3. Fuel injector; 4. CNG gas rail; 5. Gas rail bracket; 6. Rail pressure sensor; 7. CNG hose; 8. CNG nozzle; 9. Intake manifold; 10. Cylinder head. DETAILED DESCRIPTION

[0011] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0012] like Figure 1 , Figure 2 As shown, the present invention provides a dual-fuel injection arrangement structure of a CNG engine, comprising an oil rail assembly body 1, an injector 3, a CNG gas rail 4, a CNG hose 7 and a CNG nozzle 8; the four injectors 3 are all connected and installed on the oil rail assembly body 1, the four CNG nozzles 8 are connected to the CNG gas rail 4 through four CNG hoses 7, the oil 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 gas rail 4 is installed on the intake manifold 9.

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

[0014] The CNG rail 4 is arranged 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 is changed from eight injectors 3 to four, and the corresponding eight reserved mounting holes of the gasoline dual-injection cylinder head blank are added with four injector mounting holes to install the injectors 3, and the remaining four mounting holes are added with CNG nozzle mounting holes to install the CNG nozzle 8.

[0017] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A dual fuel injection arrangement structure for a CNG engine, characterized in that: The invention comprises an oil rail assembly body (1), an injector (3), a CNG gas rail (4), a CNG hose (7) and a CNG nozzle (8); the four injectors (3) are all connected and mounted on the oil rail assembly body (1); the four CNG nozzles (8) are connected to the CNG gas rail (4) through four CNG hoses (7); the oil rail assembly body (1), the four injectors (3) and the four CNG nozzles (8) are all mounted on a cylinder head (10); and the CNG gas rail (4) is mounted on an intake manifold (9).

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

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

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

Images