Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1999-03-10
2000-08-08
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
251121, 2395333, F02M 3704
Patent
active
060985984
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND INFORMATION
A fuel injection valve is described in German Patent No. 49 47 40, in which a valve closing body connected with a valve needle cooperates with a valve seat body for a valve seat. An essentially axial fuel line, opening into a fuel channel running in the radial direction in the valve seat body, is provided in the nozzle body to guide the fuel. The fuel channel opens into a spray orifice in the area of the valve seat.
Another fuel injection valve for direct injection of fuel into a cylinder of an internal combustion engine is described in German Patent Application No. 196 00 403.
A disadvantage of the conventional fuel injection valves is that the amount of fuel metered by the fuel injection valves is defined by the stroke of the fuel injection valves. The stroke of the fuel injection valves is, however, relatively complicated to alter and can only be modified within narrow limits once the fuel injection valve is assembled. Fine adjustment of the metered fuel amount is therefore relatively complicated with the conventional fuel injection valves.
Furthermore, the fuel distribution within the fuel jet exiting the conventional fuel injection valves is largely radially symmetric. In practice, however, asymmetric fuel distribution within the fuel jet is desirable under certain circumstances. Thus, for example, a fuel-air mixture composition that is different in the spark plug region from the rest of the fuel jet may be advantageous.
SUMMARY OF THE INVENTION
The fuel injection valve according to the present invention has the advantage that it make an accurate adjustment of the amount of fuel metered by the fuel injection valve possible in that the opening cross section of a throttle point of the one fuel channel or the plurality of fuel channels can be selectively modified. The amount of fuel metered by the fuel injection valves according to the present invention can be adjusted in a relatively short time in a simple manner, fully automatically. Manufacturing costs are thereby considerably reduced.
If a plurality of fuel channels distributed over the periphery of the valve seat body and the opening cross sections of the throttle points in the fuel channels can be modified independently of one another, this offers the advantage that the fuel distribution in the fuel jet exiting the fuel injection valve can be adjusted so that it becomes asymmetrical. In the region where a higher fuel density is desired, the opening cross section of the fuel channel located there must be increased, while in a region where a lower fuel density is desired, the orifice diameter of the fuel channel located there must be reduced. The resulting asymmetric shape of the fuel jet allows the fuel distribution to be adjusted to the construction geometry and the special design of the internal combustion engine, for example, to the position of the spark plugs and valves in the case of fuel injection valves that inject directly into the cylinder of the internal combustion engine or to the special geometric shape of the intake manifold in the case of fuel injection valves that inject into the intake manifold of the internal combustion engine. In particular, the amount of fuel sprayed onto the wall areas of the cylinder or the intake manifold can be reduced, which translates into improved exhaust gas parameters.
It is also advantageous that the fuel distribution can be modified even after the fuel injection valve has been fully assembled, since the location of the fuel injection valve in the internal combustion engine and the specific geometric shape of the internal combustion engine components can vary considerably depending on the engine type, i.e., from one type of vehicle to another.
The throttle point can be designed in an advantageous and simple manner by the fact that a nozzle body surrounding the valve seat body is subjected to plastic deformation from the outside, for example, using a bolt element and the fuel channel is constricted according to its deformation. The opening cross section of the throttle point can
REFERENCES:
patent: 3343798 (1967-09-01), Senft
patent: 3361353 (1968-01-01), Millman
patent: 4046322 (1977-09-01), Knape et al.
patent: 4080156 (1978-03-01), Moriya
patent: 4552310 (1985-11-01), Gaskell
patent: 5383606 (1995-01-01), Stegmaier et al.
Flik Gottfried
Martin Ottmar
Riefenstahl Jochen
Teiwes Henning
Moulis Thomas N.
Robert & Bosch GmbH
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