Internal-combustion engines – Combustion chamber means having fuel injection only – Air entering combustion chamber through plural inlets
Reexamination Certificate
2000-02-17
2001-12-04
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Air entering combustion chamber through plural inlets
C123S305000
Reexamination Certificate
active
06325042
ABSTRACT:
A direct fuel injected reciprocating internal combustion engine with externally supplied ignition constitutes a complicated system in regard to the arrangement of the charge cycle ports, the valve gears and the piston recess, whose design is additionally made more difficult, because it is necessary to place the injection nozzle at a defined position in view of an optimal mixture formation, which must take place within the combustion chamber. In connection with reciprocating internal combustion engines with two gas intake valves, the space for this is offered below the intake ports between the gas intake valves. However, this arrangement requires special structural steps.
A reciprocating internal combustion engine with externally supplied ignition and direct fuel injection is known from DE 197 41 380 A, wherein a fuel injection nozzle terminates in the combustion chamber between two gas intake valves. This arrangement is particularly provided for a charge cycle operation. However, it has been shown that with this arrangement of the gas intake valves in association with the fuel injection nozzle, the valve disks of the gas intake valves are struck to a greater or lesser extent by the injected fuel jet during so-called homogeneous operation, i.e. in the course of fuel injection during the induction stroke with fully open gas intake valves. Because of this, portions of the fuel jet are screened off. A perfect mixture formation as a whole in not possible. This can lead to disturbing blake smoke formation in a homogeneous operation, in particular at stoichiometric or below stoichiometric excess air factors.
The object of the invention is based on creating a thermodynamically advantageous concept for such a reciprocating internal combustion engine, by means of which the formation of black smoke can be at least reduced.
In connection with a reciprocating internal combustion engine with externally supplied ignition having the characteristics of the preamble of claim
1
, this object is attained in accordance with the invention, in that the roof surface of the combustion chamber roof has a shoulder in the area of the mouth of the fuel injection nozzle, which extends into the combustion chamber, covers the edge of the cylinder in the end plane, and has a front face which is oriented transversely in respect to the axis of the fuel injection nozzle and is more steeply angled in respect to the roof surface. In a preferred embodiment it is provided that the gas intake openings are arranged displaced in the direction toward the ridge line and laterally outward. By means of the arrangement of the fuel injection nozzle in accordance with the invention, it is achieved in a particularly effective manner through the positioning of the gas intake openings in the direction toward the gas exhaust side, that the gas intake openings are located higher in relation to the mouth of the fuel injection nozzle and are also further apart, so that with appropriate dimensions of the diameters of the gas intake openings when the gas intake valves are open, the valve disks of the latter can no longer be struck by the fuel jet. During homogeneous operation an engine operation, which is free of black smoke to a great extent, is possible even at excess air factors of <1 with this. The shape of the combustion chamber resulting from this can be designed to be slightly asymmetric in relation to a vertical section.
Further embodiments of the invention are recited in the dependent claims and can be taken from the description of exemplary embodiments.
A particular embodiment is recited in claim
11
. With this attainment of the object it is possible to provide the required space for the injection nozzle below the gas intake ports in that the entire valve gear is pivoted toward the exhaust side. The shape of the combustion chamber roof resulting from this is asymmetric.
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Altdorf Joachim
Bollig Christoph
Grigo Michael
Richarz Oliver
Yapici Kurt Imren
Argenbright Tony M.
FEV Motorentechnik GmbH
Kelemen Gabor J.
Venable
LandOfFree
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