Internal-combustion engines – Charge forming device – Gaseous fuel and air mixer
Patent
1996-06-13
1998-04-14
Solis, Erick R.
Internal-combustion engines
Charge forming device
Gaseous fuel and air mixer
F02M 2100
Patent
active
057380767
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a natural gas flow generating apparatus and more particulary to a compressed natural gas flow generating apparatus in which swirl and tumble motions of the compressed natural gas injected in a combustion chamber by a gas injection tube connected to a gas injector are generated, thus increasing the volumetric efficiency and accomplishing fast burn in the engine.
BACKGROUND ART
In fuel injection systems of compressed natural gas engines, using high pressure gas stored in a gas tank, it is necessary to consider a structure in which pressure of gas can be properly maintained, and, since the gaseous fuel is injected to the engine, a volumetric efficiency is reduced as compared with a gasoline engine using liquid gasoline fuel and a slow burn is generated due to the characteristics of natural gas. Generally, in a natural gas engine, fuel burn is slowed down by 10%-20% as compared with that in a gasoline engine.
FIG. 1 is a longitudinal sectional view showing the structure of an intake port according to a conventional natural gas engine, FIG. 2 is a transverse sectional view of FIG. 1. As shown in FIGS. 1 and 2, an engine 10 includes a cylinder head 2 and a cylinder block 4 combined with a lower portion of the cylinder head 2. An intake port 14 of the cylinder head 2 is curved and a plurality of spiral grooves 13 is formed at the inner wall 14a of the intake port 14. The cylinder block 4 is made of a cast iron or an aluminum-base alloy.
The cylinder head 2 includes a spark plug 18, an intake valve 15, an exhaust valve 17.
The cylinder block 4 is combined with a lower portion of the cylinder head 2, so that a combustion chamber 12 is formed.
In the conventional natural gas engine 10, the inflow process of gas G toward a combustion chamber 12 is as follows.
As shown in FIG. 1, an intake valve 15 is open, an exhaust valve 17 is closed, and the compressed natural gas is injected to a combustion chamber 12 through a curved intake port 14 by a gas injector 19 mounted on the inner wall of an intake manifold 6. Thereafter, when hit against the inner wall 12a of the combustion chamber 12, the natural gas, is swirled or tumbled in the combustion chamber 12. Accordingly, fast burn of the natural gas is accomplished, so that the engine 10 is operated by the motion of a piston 11.
However, the conventional engine as mentioned above has several disadvantages of having to change the form of the intake port 14 to a curved-type, which requires a new casting to be made and making of which increases costs.
And, since the form of the intake port becomes very complicated in the state of full load, the flow of fuel is hindered by the form of the intake port, and therefore, the volumetric efficiency in the combustion chamber and the maximum output of the engine are decreased.
DISCLOSURE OF INVENTION
The object of the present invention is to provide a compressed natural gas flow generating apparatus which reduces or solves the above-noted problems.
Another object of the present invention is to provide a compressed natural gas flow generating apparatus which enables a fast burn and which increases an engine output forces.
These and other objects of the present invention are achieved by a preferred embodiment of compressed natural gas flow generating apparatus according to the present invention, the structure of which is as follows. The compressed natural gas engine comprises a cylinder head including an intake port, an exhaust port, a spark plug, and a gas injector, a cylinder block forming a combustion chamber together with the cylinder head, and a gas supply. Power is obtained by the burn of the spark plug in the combustion chamber. A compressed natural gas flow generating apparatus comprises one or more gas supply; a pressure controller for controlling the pressure of gas injected by the gas supply; a fuel rail for providing the gas controlled by the pressure controller to the combustion chamber, the fuel rail including a plurality of gas injectors for injecting gas and a plurali
REFERENCES:
patent: 3651794 (1972-03-01), Douglas
patent: 4831993 (1989-05-01), Kelgard
patent: 5150691 (1992-09-01), Imajo
patent: 5325838 (1994-07-01), Bennett
patent: 5367999 (1994-11-01), King et al.
patent: 5522369 (1996-06-01), Povinger
Daewoo Motor Co., Ltd.
Solis Erick R.
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