Internal-combustion engines – Burning by highly compressed air – Oil engine air preheated
Patent
1999-08-02
2000-11-07
Moulis, Thomas N.
Internal-combustion engines
Burning by highly compressed air
Oil engine air preheated
123575, F02M 3704
Patent
active
061421073
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fuel injection system for an internal combustion engine.
Such fuel injection systems are known for instance from German patent DE 43 37 048 C2. In it, on the one hand a dual substance nozzle is provided that serves the purpose of laminated injection of fuel and a supplementary liquid, such as diesel fuel and water, so as to reduce pollutant emissions from the engine and possibly to increase its efficiency. On the other hand, in the known injection system, the so-called common rail technique is employed, in which all the injection nozzles serving the engine are charged with fuel at high pressure from a common rail pressure reservoir.
In the known fuel injection system, one complicated and relatively expensive 3/2-way valve is needed for each individual injector for metering the quantity of supplementary liquid, as well as one further 3/2-way valve for controlling the diesel injection quantity. For prestorage of the supplementary liquid, the fuel delivery from the common rail pressure reservoir to the injection nozzle is disrupted using the first 3/2-way valve and at the same time a pressure chamber surrounding the md and in which fuel at high pressure is stored is drained off to the low- pressure fuel side by means of a suitable position of the first 3/2-way valve. By means of the resultant pressure drop in the pressure chamber, supplementary liquid is fed via a suitable line into the pressure chamber and positively displaces the equivalent volume of fuel. Next, the first 3/2-way valve is returned to a position that establishes a communication between the common rail pressure reservoir and the pressure chamber in the injection valve. For quantitatively precise metering of the fuel quantity to be injected and that is intended to follow the prestored supplementary liquid in the injection surge caused by the next valve opening, the further 3/2-way magnet valve is provided, which selectively connects the back end of the nozzle needle, which is held in the closing position by a spring, selectively with either the common rail pressure reservoir or the low-pressure fuel side and as a result chronologically controls the valve needle stroke, the opening and closing of the valve, and thus the desired injection quantity.
In principle, the known fuel injection system for each individual injector requires the two precise and thus complicated 3/2-way control magnet valves, so that both the desired fuel quantity and the required quantity of supplementary liquid can be metered exactly.
ADVANTAGES OF THE INVENTION
The fuel injection system according to the invention, to simplifies its structure and thus makes it more economical produce. As a result, the two complicated and expensive 3/2-way magnet control valves can be replaced with a single, simpler and less expensive 2/2-way valve, because the quantity metering for the supplementary liquid is functionally and structurally separated from the component units for fuel injection. By using the pressure fluid container for supplementary liquid according to the invention, the advantages known from the common rail technique for fuel injection can be exploited. In particular, a plurality of supplementary liquid lines each leading to different dual substance nozzles can lead away from the pressure fluid container, and only a single valve unit can be provided to provide an entire group of dual substance nozzles with supplementary liquid.
BRIEF DESCRIPTION OF THE DRAWING
One exemplary embodiment of the fuel injection system for internal combustion engines according to the invention is shown in the drawing and will be described in the ensuing description. The drawing shows a schematic circuit diagram of an exemplary embodiment of the fuel injection system of the invention, along with a pressure fluid container for a supplementary liquid.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
In the exemplary embodiment, shown in the drawing, of the fuel injection system of the invention for an internal combustion engine for dual-fluid injection of fuel
REFERENCES:
patent: 5355854 (1994-10-01), Aubee
patent: 5762033 (1998-06-01), Rembold et al.
patent: 5887566 (1999-03-01), Glauber et al.
patent: 5890459 (1998-06-01), Hedrick et al.
Greigg Edwin E.
Greigg Ronald E.
Moulis Thomas N.
Robert & Bosch GmbH
LandOfFree
Fuel injection system for an internal combustion engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fuel injection system for an internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injection system for an internal combustion engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1631338