Internal-combustion engines – Water and hydrocarbon
Patent
1994-12-01
1996-08-06
Solis, Erick R.
Internal-combustion engines
Water and hydrocarbon
123 25E, 137896, F02B 4702
Patent
active
055423795
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a fuel feeding apparatus of an internal combustion engine. More in particular, it relates to an emulsion fuel feeding apparatus which feeds an emulsion of a fuel oil and water having properties suitable for the operating conditions of a Diesel engine to the engine. Further, the invention relates to a method to form a water-in fuel oil-emulsion.
PRIOR ART
It is generally known that NOx components in an exhaust gas can be reduced and an engine knock can be prevented by lowering the combustion temperature inside cylinders by feeding a fuel comprising an emulsion of a fuel oil and water to a Diesel engine.
Various methods and apparatuses have also been proposed as the apparatus for forming the emulsion of the fuel oil and water.
However, the conventional emulsion formation apparatuses have primarily been directed how to form an emulsion which is as homogeneous as possible and has a particle size as small as possible. Therefore, it has generally been difficult to readily and quickly change the water content of the emulsion.
For the reasons described above, the water content of the emulsion fuel has not been changed in practice in accordance with an engine load state in an emulsion fuel feeding apparatus using such an emulsion formation apparatus.
PROBLEMS THAT THE INVENTION IS TO SOLVE
When the engine is operated while the water content of the emulsion fuel is kept constant irrespective of the engine load, there occurs the problem that although the NOx components in the exhaust gas can effectively be reduced during a high speed high load operation, for example, the combustion temperature drastically drops and detrimental components such as HC and CO in the exhaust gas increase, on the contrary, during a low speed low load operation.
The emulsion formation apparatus used for the conventional emulsion fuel feeding apparatus for the Diesel engine has a complicated structure and its scaledown has been difficult.
MEANS FOR SOLVING THE PROBLEMS
According to the present invention, there is provided an emulsion fuel feeding apparatus for feeding an emulsion of a fuel oil and water to a Diesel engine, which comprises combustion parameter detection means for detecting at least one of combustion parameters associated with the combustion state of the engine; water content judgement/regulation means for determining the water content of the emulsion fuel in accordance with the output of the combustion parameter detection means; and emulsion formation means for forming an emulsion fuel having the water content determined by the water content judgement/regulation means.
Further, according to the invention, there is provided a method of forming an water-in-oil emulsion at a Diesel engine, by injecting water in a predeterminedly dosed quantity into Diesel oil, present between a fuel injection pump and a fuel injection nozzle of a cylinder of the Diesel engine in an inlet chamber; and introducing Diesel oil fed from the fuel injection pump under high pressure into the inlet chamber, while supplying the oil-water-mixture into the fuel injection nozzle.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing the construction of an emulsion fuel feeding apparatus of the present invention.
FIG. 2 is a flow-chart showing a first embodiment of the emulsion water content control.
FIG. 3 is a flow-chart showing the first embodiment of the emulsion water content control.
FIG. 4 is a diagram showing an example of set values of an emulsion water content ratio.
FIG. 5 is a sectional view showing an embodiment of an emulsion formation apparatus.
FIG. 6 is a bottom view of the portion A of FIG. 5.
FIG. 7 is a plan view of the portion B of FIG. 5.
FIG. 8 is a side view of the portion B of FIG. 5.
FIG. 9 is a schematic view showing an embodiment of an emulsion fuel feeding apparatus.
FIG. 10 is a sectional view of the emulsion formation apparatus shown in FIG. 9.
FIG. 11 is a schematic sectional view of the metering unit shown in FIG. 9.
FIG. 12 is an explanatory wiew useful for explaining the op
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HDC AG
Solis Erick R.
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