Internal-combustion engines – Charge forming device – Auxiliary air or gas used to inject fuel
Patent
1986-03-12
1987-09-01
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Auxiliary air or gas used to inject fuel
123472, F02M 3900
Patent
active
046901183
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a device for continuous fuel injection into the intake line of a multi-cylinder, mixture-compressing internal combustion engine in accordance with the definition of the species in claim 1.
In case of such fuel injection devices, known, e.g., from German DE-OS Nos. 29 20 636 and 32 22 000, the fuel is metered by means of an injection nozzle controlled by a control means into a carrier air current, branched off the intake line, before the mixture of fuel and supporting air formed in this manner and subsequently distributed to the individual cylinders of the internal combustion engine is injected into the intake line of the internal combustion engine, namely, the intake manifolds associated with the individual cylinders of the internal combustion engine, a short distance ahead of the intake valves thereof. The advantage of such an injection device consists in that for injection of the fuel-air mixture under pressure into the intake manifolds, no injection nozzles such as utilized in customary fuel injection devices are necessary inasmuch as the mixture under pressure, even if in small quantities, expands on entering the intake manifolds and thereby is finely divided and sprayed. This favorable [fuel] preparation effect is further enhanced by the partial fuel evaporation which occurs on expansion of the fuel-air mixture.
In these known fuel injection devices, difficulties occur which are due to the fact that the fuel-air mixture, formed by injection of the fuel into the carrier air current through a center fuel injection nozzle, prior to delivery into the individual intake manifolds must be divided among the individual cylinders. Thereby a special problem occurs because the mixture to be divided is a two-phase mixture composed of a liquid fuel and gaseous air which, for the purpose of combustion with a high efficiency and low in exhaust gases, must be divided in the cylinders of the internal combustion engine as uniformly and as precisely as possible, particularly in view of the liquid phase.
Therefore, the purpose of the invention is to provide of the kind indicated a fuel injection device fo the kind indicated whereby the problems of a uniform allotment of the fuel to the individual cylinders of the internal combustion engine are solved in a simple, low-cost manner.
This purpose is attained by providing the fuel injection device with means for dividing the carrier air current among carrier air injection lines separately associated with the individual cylinders of the internal combustion engine and a metering device comprising an injection valve having injection openings each individually associated with and opening into the carrier air injection lines.
Further suitable refinements of the invention include injection lines which branch off at equal intervals along the circumference of an air carrier reservoir, and are connected to a pressure side of an air pump. Furthermore, each of the injection openings is aligned toward a downstream end of the injection lines, the openings opening into zones of the carrier injection lines whose cross-sections are restricted in a nozzle-like fashion.
The drawing represents an example of an embodiment of the invention which will be explained in detail in the following.
FIG. 1 is a schematic circuit diagram of a fuel injectin device according to the invention, and
FIG. 2, is a representation of the dosing device on an enlarged scale.
In the circuit diagram of the fuel injection device shown in FIG. 1, -1- designates a part of a customary mixture-compressing combustion engine and -2- an intake line system leading to the said combustion engine, which system is provided with an intake distributor -2a- and a number of intake manifolds -2b-associated with the individual cylinders of the combustion engine -1-.
-9- designates an air pump and -4- a fuel pump which may be driven either separately or combined so as to form an assembly by use of a common driving motor constituted, e.g., by an electric motor, associated with the two pumps.
The fuel pump -4- sucks in
REFERENCES:
patent: 1977200 (1934-10-01), Osterberg
patent: 4246879 (1981-01-01), Fiala
patent: 4363308 (1982-12-01), Emmenthal
patent: 4543939 (1985-10-01), Ehrhart
patent: 4556037 (1985-12-01), Wisdom
Hofbauer Peter
Sandhagen Jurgen
Cox Ronald B.
Volkswagen Aktiengesellschaft
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