Internal-combustion engines – Charge forming device – Heating of combustible mixture
Patent
1998-08-18
2000-05-09
McMahon, Marguerite
Internal-combustion engines
Charge forming device
Heating of combustible mixture
123549, F02M 3100
Patent
active
060589159
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a multicylinder internal combustion engine with externally supplied ignition. The patent application GB 2 248 087 has already disclosed an internal combustion engine that has an intake tube that transitions into an intake manifold from which individual intake tubes branch to the individual combustion chambers or to the individual cylinders of the engine. By means of fuel injection valves disposed in the individual intake tubes, upstream of inlet valves of the combustion chambers, fuel can be delivered into the individual intake tubes in order to prepare an ignitable fuel-air mixture, which flows into the combustion chambers when the inlet valves are open. An electronic engine control device controls the fuel quantity delivered by the fuel injection valves as a function of the aspirated air mass of the engine and as a function of other engine operation parameters.
In addition to the injection by means of the individual fuel injection valves, the engine has another injection valve that is part of a central fuel vaporizing device which can prepare fuel vapor which is then delivered into the intake tube upstream of a throttle mechanism that is embodied, for example, in the form of a throttle valve. The delivery of fuel vapor by means of the fuel vaporizing device is limited to the lower load range, in particular to the idling range of the engine. In the upper load range, particularly in the full load, though, only the fuel injection valves associated with the combustion chambers or the cylinders deliver the required fuel. The delivery of vaporous fuel into the intake tube is intended to prevent, to the greatest extent possible, a re-condensation of the fuel vapor against cold walls of the engine that would otherwise occur during the starting phase of the engine in order to thus be able to sharply reduce the emission of polluting exhaust components, in particular hydrocarbons.
It is, however, problematic that depending on the ignition sequence of the individual cylinders or their intake sequence, because of a reciprocal influence of the cylinders during intake of the fuel vapor prepared by the fuel vaporizing device, due to intake tube oscillations, this fuel vapor is only distributed unevenly to the individual combustion chambers of the cylinders. However, this results in an increase in the emissions of polluting exhaust components so that it is not possible to maintain extremely low exhaust values as well as a smooth running of the engine.
ADVANTAGES OF THE INVENTION
The engine according to the invention has the advantage over the prior art that a virtually uniform distribution of the fuel vapor or a fuel-air mixture prepared by the fuel vaporizing device to the individual combustion chambers of the engine can be achieved so that it is possible to maintain extremely low exhaust values as well as a smooth running of the engine.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention are shown in simplified form in the drawings and are explained in detail in the description below.
FIG. 1 is a sectional representation of a partial view of an internal combustion engine according to the invention,
FIG. 2 shows a first exemplary embodiment according to the invention of a line system for the engine,
FIG. 3 shows a second exemplary embodiment according to the invention of a line system for the engine.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
In a sectional representation, FIG. 1 shows a partial view of an internal combustion engine 10, which has four cylinders 1, 2, 3, 4 or four combustion chambers 13, wherein in FIG. 1, only a single cylinder 1 with one combustion chamber 13 is depicted. Each combustion chamber 13 has at least one inlet valve 14 and one spark plug 19. Upstream of the inlet valve 14, at least one fuel injection valve 12 is provided on an individual intake tube 15 of the engine 10, which can deliver fuel into the individual intake tube 15 in the direction of the inlet valve 14. The four individual intake tubes 15 lead, for example, from an
REFERENCES:
patent: 4375799 (1983-03-01), Swanson
patent: 4550706 (1985-11-01), Hoffman
patent: 4593670 (1986-06-01), Nara et al.
patent: 5873354 (1999-02-01), Krohn et al.
Abidin Anwar
Eichendorf Andreas
Vogel Christof
Greigg Edwin E.
Greigg Ronald E.
McMahon Marguerite
Robert & Bosch GmbH
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