Internal-combustion engines – Combustion chamber means combined with air-fuel mixture... – Air or combustible mixture entering the combustion chamber...
Patent
1997-05-19
1998-10-13
Solis, Erick R.
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
Air or combustible mixture entering the combustion chamber...
123531, 23953312, F02B 1500
Patent
active
058197079
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fuel injection valve. A fuel injection valve is already known (U.S. Pat. No. 4,982,716) in which the fuel streams, aimed at the various inlet conduits of a cylinder, are always ejected simultaneously. This has the disadvantage however, that whenever in certain operating states of the internal combustion engine, such as idling and lower partial load, one of the at least two inlet valves is turned off to improve engine operation with respect to fuel consumption and exhaust emissions, at least one of the separate fuel streams undesirably hits the closed inlet valve.
Two separate fuel streams are generated in this fuel injection valve, because downstream of the valve seat a single fuel stream strikes an impact face and is split into two separate fuel streams by a stream splitter.
From European Patent EP 0 242 978, a fuel injection valve is also known that has a perforated disk, downstream of the valve seat face, in which six injection ports are provided; the individual streams each emerging from three injection ports are aimed toward one another in such a way that two separate fuel streams are produced, and each fuel stream is aimed into one inlet conduit of a cylinder of the engine. In this fuel injection valve as well, the fuel is injected into the two inlet conduits of each engine cylinder via the two separate fuel streams even if one of the inlet valves is closed.
A fuel injection valve is also known (SAE Technical Paper Series 920 294, 1992; Development of Air-Assisted Injector System), in which an adapter with a stream splitter is provided, by means of which fuel injected from the injection valve is split into two fuel streams, to which air for preparation is added via air conduits; the air is controllable by a control valve that branches off from a bypass line around the throttle valve in the engine intake tube. With one closing member, the control valve opens and closes the air line to the fuel injection valves, and with another closing member it closes the bypass line around the throttle valve.
ADVANTAGES OF THE INVENTION
The fuel injection valve according to the invention has the advantage over the prior art that in a simple way, in certain engine operating states such as idling and lower partial load, fuel is delivered to each cylinder of the engine only via the open inlet valve or valves, while in the these certain operating states, no fuel is prestored upstream of the closed inlet valves or valve. As a result, not only fuel consumption but also the proportion of pollutants in the exhaust gas can be reduced, and the performance at transitions between operating states can be improved.
By means of the provisions recited herein, advantageous further features of and improvements to the fuel injection valve disclosed hereinafter are possible.
It is especially advantageous to dispose a front attachment, in which the blocking element is supported movably, on the fuel injection valve. Hence there is no need to modify the construction of existing fuel injection valves; a suitable front attachment need merely be adapted to the particular fuel injection valve. It is also advantageous to displace the blocking element by means of air that is delivered to the fuel injection valve to prepare the injected fuel. It is also advantageous to insert a control valve into the air line to the blocking element, by which valve the air line can be closed partway or entirely, in order to actuate the blocking element exactly in accordance with particular requirements of the engine.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention are shown in simplified form in the drawings and described in further detail in the ensuing description.
FIG. 1a shows a fuel injection valve, disposed at an inlet conduit of an internal combustion engine, to which an air line with a control valve is connected;
FIG. 1b is a schematic illustration of the injection of two separate fuel streams through one fuel injection valve into two inlet conduits of a cylinder of an internal combust
REFERENCES:
patent: 5244154 (1993-09-01), Bucholz et al.
patent: 5520157 (1996-05-01), Pontoppidan
patent: 5603301 (1997-02-01), Sakurai et al.
patent: 5636613 (1997-06-01), Aoyama et al.
Grytz Uwe
Lauter Stefan
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Solis Erick R.
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