Internal-combustion engines – Combustion chamber means having fuel injection only – Having a particular relationship between injection and...
Reexamination Certificate
1999-08-18
2001-11-13
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Having a particular relationship between injection and...
C239S533120
Reexamination Certificate
active
06314936
ABSTRACT:
TECHNICAL FIELD
The invention is related to the field of internal combustion engine technics and especially to a new technics for injection of a fuel mixture in a combustion chamber.
BACKGROUND OF THE INVENTION
In a conventional combustion of a fuel air mixture in a flame in a combustion chamber it is common to spray fuel through a hole in a stationary nozzle. The combustion may then be a so called diffusion flame. The combustion of a diffusion flame is exemplified by the combustion in a diesel engine.
In a diffusion flame, the combustion is achieved by diffusion, that is molecular transportation mainly through turbulence, of fuel vapour from the interior of the flame and diffusion of oxygen from outside to the flame front. Because of the continues injection to the flame centre, a high concentration of fuel is maintained in the already oxygen lacking flame centre. In the flame centre with nearest surroundings soot formation is taking place as an intermediate step in the combustion because of high temperature and lack of oxygen.
In the outskirts of the flame where the oxygen is added, the highest temperatures is maintained where the mixture ratio is near to stoichiometric. In the locations with the highest temperatures, most of the NOx formation is taking place. A certain air entrainment occurs into the flame centre, but the amount is far to little for complete combustion.
The development of the combustion system is normally achieved by influencing the injection pressure, change of the number of holes, by influencing the air movement and combustion chamber geometry. All these earlier known systems are however based on injecting the fuel mixture in a combustion chamber in stationary directions, that is where it after an initial process, a lack of oxygen quickly develops in the direction of injections.
The technical report SAE950081 describes an injector with variable hole area. The holes is here doing an axial movement. The movement is only taking place during the opening phase and the movement does not give the wanted effect. This type of injector with the holes located in the injector needle should enable an in the injector built in turning and axial movement mechanism.
PURPOSE OF THE INVENTION
The purpose of the presented invention is to solve the problem of lack of oxygen, soot- and NOx-formation in conjunction with fuel injection with conventional practice and devices in conjunction with combustion in a combustion chamber.
SUMMARY OF THE INVENTION
This purpose is achieved by a method and device according to following patent claims, where the injection is taking place with varying direction during the injection event. Thus the purpose of the presented invention is to achieve a method and device witch enables a position changing injection of a fuel mixture into a combustion chamber with features which are described of the following patent claims.
REFERENCES:
patent: 1592260 (1926-07-01), Waern
patent: 3621821 (1971-11-01), Jarnuskiewicz
patent: 4204506 (1980-05-01), Bowling
patent: 6055957 (2000-05-01), Hasegawa et al.
patent: 4203343C1 (1993-05-01), None
patent: 0713004A1 (1996-05-01), None
patent: 2096702-A1 (1982-10-01), None
patent: WO94/10440 (1994-05-01), None
“Variable Orifice Geometry Verified on the Two-Phase Nozzle (VRD)” Detlev Potz et al., SAE Technical Papers Series, No. 950081 (1995) pp. 53-62.
Burns Doane Swecker & Mathis L.L.P.
Sigmec AB
Wolfe Willis R.
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