KR19980038495A - Fuel injection device of compressed natural gas vehicle engine - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection device for a compressed natural gas vehicle engine, which is supplied from a fuel container (11), decompressed in a regulator (12), and an intake manifold of an engine (15) to an injector (14) through a fuel rail (13). Compressed fuel configured to be supplied to the folds 18 and air passing through the air cleaner 16 and the resonator 17 are mixed in the intake manifold 18 and supplied to the combustion chamber 16a of the engine 16. In the fuel supply device of a natural gas vehicle, a compressor 25 is installed to boost the air via the resonator 17, and the air supplied through the compressor 25 and the fuel supplied through the fuel rail 13 The passage is integrally formed so as to be mixed and is composed of an injector 20 installed to directly inject into the combustion chamber 15a of the engine 15.

Description

Fuel injection device for compressed natural gas vehicle engine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection device for a compressed natural gas vehicle engine, and more particularly, to a fuel injection device for a compressed natural gas vehicle engine configured to directly inject an increased pressure of fuel and an injector to be injected into a combustion chamber.

Generally, gasoline or diesel is used for vehicles, but in recent years, vehicles using low-polluting compressed natural gas (CNG) have been increasing.

FIG. 2 is an exemplary view showing a schematic configuration of a fuel supply device of a conventional compressed natural gas fuel vehicle, and a regulator 12 connected from a fuel container 11 to reduce a pressure of a fuel is connected to the regulator 12. The fuel rail 13 (Fuel Rail) provided with the injector 14 which injects fuel to the engine 15 via it is comprised.

'16' is the air cleaner, '17' is the resonator, '18' is the intake manifold, and '19' is the spark plug.

Therefore, the fuel supplied from the fuel container 11 is supplied to the intake manifold 18 of the engine 15 by depressurizing the regulator 12 and injecting the injector 14 from the fuel rail 13.

However, in the engine using the compressed natural gas as a fuel, unlike the gasoline or diesel engine, the gas is used in the gaseous state, so that the air passes through the air cleaner 16 and the resonator 17 and the intake manifold 18. There is a problem in that the volumetric efficiency is reduced because the gaseous fuel occupies the portion occupied by the air in the supply to the engine through. Accordingly, a problem that causes a decrease in engine performance will occur.

The present invention has been made in view of the above problems, and an object of the present invention is to eliminate the reduction in volumetric efficiency caused by supplying gaseous fuel to the engine of a vehicle using a compressed natural gas and to improve the performance of the engine and It is to provide a fuel injection value for a compressed natural gas vehicle engine.

1 is a structural example of the present invention,

2 is a schematic configuration diagram of a fuel supply device of a conventional compressed natural gas fuel vehicle.

* Explanation of symbols for main parts of the drawings

11 fuel container 12 regulator

13: fuel rail 15: engine

15a: combustion chamber 16: air cleaner

17 resonator 18 intake manifold

19: spark plug 20: injector

25: compressor

In order to achieve the above object, the present invention supplies the intake manifold 18 of the engine 15 to the injector 14 through the fuel rail 13 and reduced pressure in the regulator 12 supplied from the fuel container 11. Fuel supplying device of the compressed natural gas vehicle configured to mix the fuel to be supplied and the air passing through the air cleaner 16 and the resonator 17 in the intake manifold 18 and supply it to the combustion chamber 16a of the engine 16. To

The compressor 25 is installed to boost the air passing through the resonator 17, and a passage is integrally formed so that the air supplied through the compressor 25 and the fuel supplied through the fuel rail 13 are mixed with each other. It provides a fuel injection value of the compressed natural gas vehicle engine, characterized in that the injector 20 is installed to be injected directly into the combustion chamber (15a) of 15).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing the configuration of the present invention, a regulator 12 for reducing the pressure of the fuel supplied from the fuel container 11 is connected and the fuel rail 13 connected from the regulator 12 is installed It is shown.

The injector 20 withdrawn from the fuel rail 13 to supply fuel to the engine 15 is installed to directly inject the combustion chamber 15a without an intake manifold, and air is supplied to one side of the injector 20. When possible, the compressor 25 is installed and connected to the injector 20 to boost the air from the air cleaner 16 via the resonator 17.

Therefore, in the present invention, the fuel supplied from the fuel container 11 is supplied to the injector 20 via the regulator 12 and the fuel rail 13, and the air passing through the resonator 17 is supplied from the compressor 25. The pressure is increased and mixed with the fuel supplied through the fuel rail 13 to be injected into the combustion chamber 15a of the engine 15.

That is, since the pressure of the compressed natural gas, which is fuel, is reduced and supplied to about 7 bar in the regulator 12, the air is also increased by the compressor 25 and supplied according to the mixing ratio of fuel and air.

On the other hand, the configuration of the injector 20 may preferably illustrate a solenoid type, which is to open the injector by a pulse by the controller and to close by the restoring force of the spring.

As described above, the present invention can smoothly supply fuel and air directly to the combustion chamber of the engine, thereby eliminating the reduction in volumetric efficiency caused by supplying gaseous fuel to the engine of a vehicle using a compressed natural gas and improving the performance of the engine. There is an effect that improves. Therefore, it is possible to expect the diffusion effect of the alternative fuel vehicle by overcoming the deterioration of the driving performance, which is a disadvantage of the engine using the compressed natural gas.

Claims (2)

A fuel supplied from the fuel container 11 to reduce the pressure in the regulator 12 and to supply the intake manifold 18 of the engine 15 to the injector 14 through the fuel rail 13 and the air cleaner 16. In the fuel supply apparatus of the compressed natural gas vehicle configured to mix air passing through the resonator (17) and the resonator (17) in the intake manifold (18) to supply the combustion chamber (16a) of the engine (16), The compressor 25 is installed to boost the air passing through the resonator 17, and a passage is integrally formed so that the air supplied through the compressor 25 and the fuel supplied through the fuel rail 13 are mixed with each other. A fuel injection device of a compressed natural gas vehicle engine, characterized by comprising an injector (20) installed to directly inject into the combustion chamber (15a) of the 15. 2. The fuel injection device of claim 1, wherein the injector is configured in a solenoid type to be opened by a pulse by a controller and closed by a restoring force of a spring.