Spark-ignition piston engine with facilities for changing the in

Details Spark-ignition piston engine with facilities for changing the in Spark-ignition piston engine with facilities for changing the in

1995-11-09

1997-05-27

Argenbright, Tony M.

Internal-combustion engines

Means to whirl fluid before, upon, or after entry into...

12318445, F02B 3100

Patent

active

056322445

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a reciprocating piston engine with an externally supplied ignition, i.e., spark ignition, and at least one inlet port per cylinder, each of which can be closed and opened by an inlet valve, which is associated with a conduit-shaped inlet for air and/or a fuel-air mixture and which is connected with means which enable a controllable deflection of flow at the transition from the inlet through the inlet port into the cylinder.
WO 91/14858 discloses an engine of the above-described type. The means for deflecting the flow in the prior device are comprised of slides, butterfly valves, swivel nozzles, or the like, which are disposed in the conduit-shaped inlet, immediately upstream of the inlet port. These elements are actuated via corresponding actuation means, depending upon the operational state of the engine, in order in certain operational states to deflect the fuel-air mixture, always referred to below as gas flow, which is flowing through the conduit-shaped inlet, so that during the intake stroke, inside the cylinder space, a rolling vortex is formed, whose rotational axis runs perpendicular to the cylinder axis. The disadvantage of this apparatus is comprised in that the actuation means are disposed and supported in the inlet directly upstream of the inlet port, that is, in a region in which there is only a small amount of space available for additional elements.
The object of the invention now is to improve a reciprocating piston engine of the kind described at the beginning with regard to the deflection possibilities of the gas flow upon entry into the cylinder.
This object is attained according to the invention by the fact that the inlet has at least a first and a second partial conduit, which join together to form an inlet region immediately upstream of the inlet port. The dividing plane is aligned essentially perpendicular to the axis of the cylinder, that at least the first partial conduit is connected to the fuel supply, and that means are associated with at least the second partial conduit, which are for changing its free flow cross section. This apparatus has the advantage that the flow through at least one of the partial conduits is purposefully supplied to a section of the valve gap region and the distribution over the valve gap of the charge mass flowing into the cylinder can be changed by throttling at least one of the partial flows. Since the distribution of the charge mass over the valve gap has a determining influence on the development of a vortex in the cylinder, in the end the vortex development and vortex intensity in the cylinder can be controlled by the throttling of at least one of the partial conduits. At the same time, there is the possibility of influencing the degree to which the various ingredients in the charge mix. The mass distribution onto the upper and lower valve gap region is influenced by means of this. At a greater percentage by mass, a rolling vortex (tumbling) is formed in the cylinder of the engine by means of the upper valve gap region, which vortex can favorably influence combustion and, if desired, makes possible a stable layering between air, fuel, and/or exhaust. The vortex development when the lower partial conduit is closed furthermore leads to a favorable combustion behavior at low engine loads (partial load). At full load, no intense vortices should be produced, i.e., both partial conduits should be open. The particular advantage of this device is comprised primarily in that the means for changing the free flow cross section do not have to be disposed directly upstream of the inlet port, but with a certain spacing from it so that greater embodiment possibilities in construction are available here.
A further advantage of the invention is comprised in that the necessary built-in parts in the inlet conduit reduce the free flow cross section only slightly so that only slight additional flow losses occur. Already for structural reasons, the preferably upper first partial conduit is connected to the fuel suppl

REFERENCES:
patent: 4347816 (1982-09-01), Saito et al.
patent: 4381738 (1983-05-01), Shaffer
patent: 4543931 (1985-10-01), Hitomi et al.
patent: 4641620 (1987-02-01), Yoshimura et al.
patent: 5186139 (1993-02-01), Matsura

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