Method to decrease black smoke of diesel

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Drawing sheet — no readable text.

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METHOD TO DECREASE BLACKSMOKE OF BRIEF DESCRIPTION OF THE DRAWINGS DESEL FIG. 1 is a schematical drawing of an embodiment of the method to decrease black smoke of diesel engine

BACKGROUND OF THE INVENTION 5 according to the present invention;

The present invention relates to a method to decrease FIG. 2. is a diagram to explain the principle of the black smoke of diesel engine by injecting combustible method according to this invention; gas or non-combustible gas in the latter stage of diesel FIG. 3 is a diagram showing the results of the experi engine combustion. ment, in which black smoke is decreased when each of In a diesel engine, it is essential to furnish the air-fuel O the gases is injected.

mixture as completely and quickly as possible and to DESCRIPTION OF THE PREFERRED achieve complete combustion of as much fuel as possi EMBODIMENTS ble by the air in the combustion chamber in order to convert the fuel energy efficiently into work. However, In the following, the embodiment of the present in as far as diesel fuel oil is used as fuel, the unburnt prod 15 vention will be described in connection with the draw ucts remain more or less, and these substances are emit ings. In the drawings, 1 refers to a cylinder of an engine, ted as black smoke. 2a a cylinder head, 2b a piston, 3a fuel injection nozzle, From the viewpoint to eliminate black smoke, a diesel 4 an auxiliary injection nozzle, 5 a fuel tank, 6 an air engine not discharging black smoke has already been 20 tank, and 7 a fuel reforming apparatus. attained in a methanol diesel engine using methanol as On the cylinder head 2 of the engine, a diesel fuel fuel because methanol is an oxygen-containing sub injection nozzle 3 and an auxiliary injection nozzle 4 are stance. However, methanol is not available at the filling provided, and the fuel from a fuel tank 5 is injected from stations, and the problems remain with regard to the a fuel injection nozzle 3 into the cylinder 1. A part of supply and the cost of methanol. 25 the fuel from the fuel tank 5 and the air tank in the air It is an object of the present invention to decrease tank 6 are sent to the fuel reforming apparatus 7, where black smoke emitted by diesel fuel combustion by in jecting the combustible gas or non-combustible gas in istheinjectedfuel is partially oxidized. The reformed gas mixture from said auxiliary injection nozzle 4 into the the latter stage of diesel fuel combustion. cylinder 1 in the latter stage of the diesel fuel combus Another object of this invention is to obtain the oxy 30 tion.

gen-containing combustible gas by reforming a part of In the fuel reforming device 7 as described above, diesel fuel by a fuel reforming apparatus.

Still other objects and advantages of the invention using afuel diesel is decomposed by partial oxidation reaction nickel catalyst. The reaction formula is as fol will in part be obvious and will in part be apparent from lows:

the specification. 35

SUMMARY OF THE INVENTION

To attain these objects, the method to decrease black The combustible gases consisting of the carbon mon smoke of diesel engine according to this invention is oxide and the hydrogen thus generated are injected characterized in that a fuel injection nozzle to inject the from the auxiliary injection nozzle 4 into the cylinder 1. diesel fuel into cylinder and an auxiliary injection noz FIG. 2 shows the condition of the combustion in the zle to inject the combustible gas or non-combustible gas cylinder. When the diesel fuel injected from the fuel are provided, and that said combustible gas or non-com injection bustable gas is injected in the latter stage of the diesel generated nozzle 3 is burnt in the cylinder, carbon is fuel combustion. More concretely, a part of fuel is re 45 ciently mixed. In thistheembodiment, because fuel and the air are not suffi the combustible gas formed to combustible and/or non-combustible gases is injected from the auxiliary injection nozzle 4 into the by a fuel reforming apparatus and these gases are in cylinder 1 in the latter stage of the combustion. The jected into cylinder, or the combustible gas or non-com mixing of the fuel with the air in the cylinder is further bustible gas is prepared in another gas cylinder and this accelerated by the energy of the explosion induced by gas is injected in the latter stage of the combustion. 50 combustible gas combustion, and black smoke is de In diesel engine, carbon is generated when diesel fuel injected from fuel injection nozzle is burnt within the creased.

The present invention is naturally not limited to the cylinder, because the fuel and the air are not sufficiently above mixed together. Whereas, according to this invention, ations embodiment, can be and various modifications and vari conceived. For example, the quality of a in the latter stage of the diesel fuel combustion, the 55. part of the fuel may be improved to the combustible gas combustible gas containing preferably oxygen or non combustible gas consisting preferably of a large molecu by a fuel reforming apparatus, or the combustible gas lar weight is injected from the auxiliary injection nozzle consisting of hydrogen or carbon monoxide may be into the cylinder, and the mixing of the fuel with the air prepared in another gas cylinder, and this gas may be is further accelerated within the cylinder by the explo injected in the latter stage of the combustion. sion energy or the kinetic energy induced by gas injec Or, the non-combustible gas such as oxygen (O2), tion, which accelerate reburning of carbon generated at helium (He), nitrogen (N2), argon (Ar), etc. may be the former stage of the diesel fuel combustion. injected in the latter stage of the combustion. The invention accordingly comprises the features of FIG. 3 shows how black smoke is decreased when construction, combinations of elements, and arrange 65 the above 2 types of combustible gas or 4 types of non ment of parts which will be exemplified in the construc combustible gas are injected. In the figure, the line Y tion hereinafter set forth, and the scope of the invention represents the level of black smoke when gas is not will be indicated in the claims. injected.

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Further, the gas injection may be controlled in such 2. A method for decreasing black Smoke of diesel manner that gas is injected only when the engine is engine as set forth in claim 1, wherein a portion of the operated in high load condition. fuel is reformed by a fuel reforming apparatus to pro What is claimed is:

duce a reformed combustible gas and the reformed combustible gas is injected in the latter stage of the 1. A method for decreasing black smoke of an operat combustion.

ing diesel engine, characterized in that a fuel injection 3. A method for decreasing black smoke of diesel nozzle to inject the fuel into a combustion chamber in a engine as set forth in claim 1, wherein said combustible gas is selected from the group consisting of hydrogen, cylinder of the diesel engine and an auxiliary injection O carbon monoxide and a mixtures thereof. nozzle to inject combustible gas or non-combustible gas 4. A method for decreasing black smoke of diesel into the combustion chamber of the cylinder are pro engine as set forth in claim 1, wherein said non-com vided, and that said combustible gas or non-combustible bustible gas is selected from the group consisting of gas is injected into the cylinder in the latter stage of oxygen, helium, nitrogen and argon. combustion. 15 e k

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UNITED STATES PATENT AND TRADEMARK OFFICE

CERTIFICATE OF CORRECTION

it is certified that error appears in the above-identified patent and that said Letters Patent is hereby corrected as shown below:

on the title page, Item (54), second line, after "DIESEL", insert -- ENGINE -- .

on the title page, Item (73), "Advance" should read - Advanced -- .

Signed and Sealed this

Sixth Day of October, 1992

Attest:

DOUGLAS B. COMER

Attesting Officer Acting Commissioner of Patents and Trademarks