Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-05-14
2000-06-27
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123198D, 123468, 138104, F02M 4100
Patent
active
060793910
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a fuel injection system for internal combustion engines. A fuel injection system of this kind has been disclosed by DE 43 18 078 A1 U.S. Pat. No. 5,458,103.
In fuel injection systems of this kind, considerable pressures of well over 1,000 bar occur in the high pressure reservoir. Since high pressure reservoirs of this kind also have connection points for pressure lines and connection points for fuel delivery, there is a danger of leakage. As a rule, leakage points have very small cross sections and when there is constant high fuel pressure in the high pressure reservoir, these leakage lead to thin-streamed, hardly visible fuel leaks of a type similar to the fuel injection streams that automatically occur in unit fuel injectors. Fuel streams of this kind have a considerable kinetic energy which can be destructive and in particular, can also be a threat to people working in the vicinity of high pressure fuel reservoirs of this kind.
ADVANTAGES OF THE INVENTION
The invention has the advantage over the prior art that the fuel emerging through the sheath is captured and then can be diverted so that the above mentioned damage does not occur. Advantageously, the sheath is comprised of a sleeve embodied in the form of a mesh, which permits a maximum of flexibility and fatigue endurance and nevertheless, reliably prevents the emission of damaging fuel streams. In a further embodiment, it is particularly advantageous to provide a capture device for the emerging fuel, which can be advantageously monitored according to claim 6 by a fluid level metering device. As a result, not only are the dangers of fuel emission from the high pressure reservoir prevented, but also fuel is prevented from being emitted in an uncontrolled manner for a longer time. In a particularly simple manner, the high pressure reservoir is accommodated inside a cylinder head cover that is already to be provided in the engine and closes off the gas exchange valve drive from the outside, on the one hand, to prevent damage and on the other hand, to capture lubricating oil that is returned to the oil collecting reservoir of the engine via an oil return. This also simultaneously serves to take in leakage fuel emerging from the high pressure reservoir. Here, too, a monitoring of the fluid level in the oil collecting reservoir is advantageously provided, in particular so that the lubricating oil of the engine also does not undergo an excessive dilution by means of the fuel and the fact of such an incipient dilution is rapidly indicated and/or too great a dilution is automatically prevented if need be by means of control interventions.
BRIEF DESCRIPTION OF THE DRAWING
Three exemplary embodiments of the invention are shown in the drawings. They are explained in detail in the description below.
FIG. 1 shows a schematic representation of a fuel injection system,
FIG. 2 shows a first embodiment according to the invention of a sheath of the high pressure reservoir of the fuel injection system,
FIG. 3 shows a second exemplary embodiment of a sheath of the high pressure reservoir, with an essentially closed jacket made of sheet metal, and
FIG. 4 shows a simplified schematic representation of a third exemplary embodiment of the invention with a high pressure reservoir accommodated inside a cylinder head cover.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
FIG. 1 schematically represents a fuel injection system that has a fuel reservoir 1 from which a high pressure delivery pump 3 aspirates fuel via a suction line 2 and feeds it at high pressure via a pressure line 4 into a high pressure fuel reservoir 6. The fuel pressure in this high pressure fuel reservoir is monitored by a pressure sensor 7 and the value transmitted by this sensor is compared to a set point value in a control device 9. When there is a deviation, a pressure adjusting device 10 is triggered, e.g. of the kind in which excess fuel is returned to the tank once again via an adjustable valve disposed in a discharge line 11 of the high pressure fuel reservoir 6.
REFERENCES:
patent: 3194221 (1965-07-01), Dinger
patent: 3783842 (1974-01-01), Kuhn
patent: 4209041 (1980-06-01), Loukonen
patent: 4675221 (1987-06-01), Lalikos
patent: 5002030 (1991-03-01), Mahnke
patent: 5129428 (1992-07-01), Winter
patent: 5179922 (1993-01-01), Bartholomew
patent: 5239964 (1993-08-01), Diener
patent: 5284184 (1994-02-01), Noone
patent: 5533485 (1996-07-01), Bronkal
patent: 5622210 (1997-04-01), Crisman
Bronkal Bernhard
Burkel Rainer
Eyberg Wilhelm
Grosser Martin
Knab Norbert
Greigg Edwin E.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
LandOfFree
Fuel injection system for internal combustion engines 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 internal combustion engines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injection system for internal combustion engines will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1775423