Internal-combustion engines – Charge forming device – Auxiliary air or gas used to inject fuel
Patent
1991-11-08
1993-03-09
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Auxiliary air or gas used to inject fuel
123468, 239407, F02M 6908, F02M 6904, F02M 6114, F02M 6118
Patent
active
051918714
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on an apparatus for injecting a fuel-gas mixture as set forth hereinafter. In German Patent Application P 39 31 490.1, an apparatus for injecting a fuel-gas mixture has already been proposed that has a mixing housing that has a recess, a central gas delivery line, and a number of mixing lines corresponding to the number of injection ports of the valve head. However, the fuel stream is injected into the mixing lines from the injection ports not directly but rather in the form of a free stream, so that the danger exists that a fuel film will form in the mixing housing on the walls defining the recess; this prevents the formation of a largely homogeneous fuel-gas mixture. The large cross sections of the recess of the mixing housing in the region of the injection ports and mixing lines do not allow high gas speeds in these regions, so fuel injected from the injection ports can get into the gas delivery line, especially if the fuel injection valve is installed in an inclined position. Fuel can become deposited in the corners or edges formed in the recess and can lead to continued dribbling, after shutoff of the fuel injection valve, for instance, which can be a problem.
Reliable, exact fuel metering to the various mixing lines and thus to the various cylinders of an internal combustion engine is therefore not always assured by the apparatus proposed in German Patent Application P 39 31 490.1.
ADVANTAGES OF THE INVENTION
The apparatus according to the invention for injecting a fuel-gas mixture, has the advantage over the prior art of particularly accurate fuel distribution to the various mixing lines and cylinders of an internal combustion engine, and of maximally homogenous mixture formation. The oriented fuel stream is injected from the injection ports directly into the mixing lines and is transported onward all the way downstream by means of the gas carried by the gas conduits, preventing the formation of a fuel film on the walls of the mixing lines. Virtually no corners, edges or gaps where fuel can become deposited are formed in the mixture formation zone, in the region of the mixing line oriented toward the injection port; after the shutoff of the fuel injection valve, for instance, such deposits could lead to problematic further dribbling and nonhomogeneous formation of the fuel-gas mixture.
Advantageous further features of and improvements to the apparatus defined herein are possible with the provisions set forth.
The narrow embodiment of the gas conduit results in acceleration of the gas, fine atomization of the fuel, and thus improved mixing of gas and fuel. The high gas speed and the reduction of pressure in the mixing lines prevent the formation of a mist or film of fuel in the gas delivery line.
It is particularly advantageous if the gas conduits are embodied between the valve head and the mixing housing; this makes the gas conduits discharging directly into the mixing line simple to manufacture.
It is advantageous if the gas conduits are either formed in the mixing housing and defined by the bearing face of the valve head, or formed in the valve head and defined by the contacting surface of the mixing housing, so that the grooves that form the gas conduits need to be disposed either in the mixing housing only or in the valve housing only, which reduces manufacturing costs.
However, it is also advantageous if the gas conduits that connect the gas delivery line to the mixing lines are embodied as bores, which are easy to manufacture.
It is advantageous if the gas conduits extend as far as the injection ports, so that the injected fuel is transported all the way downstream, without the danger of fuel getting into the gas conduits.
As an alternative to a constant cross-sectional area of the gas conduits, it is especially advantageous if the gas conduits have a varying cross-sectional area, so that the location of gas expansion or throttling is at a point between the gas delivery line and the mixing lines in the gas conduits.
For metering and accele
REFERENCES:
patent: 4570598 (1986-02-01), Samson et al.
patent: 4690118 (1987-09-01), Hofbauer et al.
patent: 4708117 (1987-11-01), Mesenich et al.
patent: 4909220 (1990-03-01), Field et al.
Argenbright Tony M.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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