JPS5853668A - Combustion method in internal-combustion engine - Google Patents

Abstract

PURPOSE:To suppress production of noxious gases by injecting water in the time of completion of explosive combustion stroke. CONSTITUTION:An injection nozzle 12 provided with a pump 13 and a water tank 14 in addition to an ignition plug 11 is disposed on the top of a cylinder 1, and compressed mixed fuel is fired by a plug 11 in the upper dead point of a crank 5 to inject water into the cylinder from the nozzle 12 in the time of combustion completion of explosive combustion stroke. Thus, the water absorbs evaporation heat from flame to provide steam while pressure in the cylinder 1 is increased to press a piston 2 further and suppress production of noxious gases while improving the output to save fuel.

Description

[Detailed description of the invention] The present invention relates to a combustion method for an internal combustion engine.

In a general internal combustion engine, if the compression pressure in the compression stroke is higher to a certain extent, and if the ignition timing is advanced by a certain amount in proportion to the increase in rotational speed, combustion efficiency will improve and the output will also improve.As a secondary effect, Save fuel, t, H
C-? Although CO gas also decreases, there is a problem in that harmful gases such as nitrogen peroxide (NOX) increase. This is because nitrogen in the air is oxidized because the temperature becomes too high at the end of the explosive combustion process.

The present invention was made with the entire intention of solving the above problem, and by injecting water toward high-temperature combustion gas at the end of combustion in the explosive combustion stroke, the water absorbs vaporization heat from the combustion gas. At the same time as the combustion gas turns into water vapor, the temperature of the combustion gas is controlled and the output is increased by the expansion action of the water vapor, reducing the generation of harmful gases such as nitrogen peroxide, saving fuel and increasing output. The present invention aims to provide a combustion method for an internal combustion engine.

The combustion method of the present invention will be explained in detail below based on the accompanying drawings.

1 to 5 show an example of the process of the combustion method of the present invention, and show the case of a four-stroke gasoline engine.

In the figure, the cylinder 2 that constitutes the entire IFi combustion chamber is a piston that is slidably disposed within the cylinder 1, and the output shaft 4 that is disposed within the crank chamber 3 that communicates with the cylinder 1.
connected to a crank 5 mounted on the engine via a connecting rod 6,
The reciprocating motion of the piston 2 can be converted into rotational motion. Further, an intake pipe 7 and an exhaust pipe 8 are connected to the top side of the cylinder 1, and an intake valve 9 or an exhaust valve 10 is disposed at each connection portion so as to be openable and closable. My friend, there is a spark plug 11 on the top of the cylinder 1,
An injection nozzle 12 of a water injection device that injects water into the cylinder 1 is provided. In addition, 13H pump in figure 1, 1
4 is a water tank.

In the internal combustion engine configured as described above, as shown in FIG. 1, the intake valve 9 is opened and the piston 2
2, the intake valve 9 and the exhaust valve 10 are closed and the piston 2 is in the closed state.
rises to become a compression stroke, and at the top dead center of the crack 5, the sintered mixture fuel is compressed by the spark plug 11 and ignited, and at the end of combustion in the explosive combustion stroke shown in Fig. 3, the button is pressed as shown in Fig. 4. , water injection device injection nozzle 1
When water is injected from 2 toward the high-pressure combustion flame in cylinder 1, the water absorbs the heat of vaporization Yr from the high-temperature combustion flame and becomes water vapor, and at the same time, due to its expansion phenomenon, water is injected into cylinder 1.
The pressure inside the piston 2t is increased to further push the piston 2t in the downward direction. This also improves the duration of the output in the characteristic curve shown in FIG. 6, resulting in increased output and fuel savings. Note that FIG. 5 shows the exhaust stroke.

As explained above, according to the combustion method of this invention,
By injecting water toward the high-temperature combustion flame in the combustion chamber at the end of combustion in the explosive combustion process, the water absorbs vaporization heat from the combustion flame and turns into water vapor, and at the same time all temperature control is carried out. Since the piston is further pushed down by the high pressure generated by the generation of water vapor, the generation of harmful gases such as nitrogen peroxide is controlled, and HC-? Is it possible to reduce pollution gases such as CO gas and save fuel? At the same time, it is possible to obtain excellent effects such as being able to improve the output. In addition, for example, NO may be added to the injected water.
Substances that help reduce X, Co, HC, etc., or
By mixing and dissolving useful substances such as substances that help prevent rust inside and outside the engine, and substances that are useful for water injection, it can achieve even better effects than K, and its utility value is remarkable. be.

[Brief explanation of the drawing]

In the accompanying drawings, FIGS. 1 to 5 respectively show the intake stroke, compression stroke, explosive combustion stroke, and
Schematic sectional view showing the water injection stroke and exhaust stroke at the end of the explosion combustion stroke, a! FIG. 6 shows characteristic curves comparing all combustion states of the present invention and the conventional combustion state. 1... Cylinder (combustion chamber), 2... Piston, 3...
...Crank chamber, 4...Output shaft, 5...Crank,
6 - Connecting rod, 7... Intake pipe, 8... Exhaust pipe, 9...
-・Intake valve. 10...Exhaust valve, 11...Spark plug, 12-.Water injection nozzle.

Claims (1)

[Claims] In an internal combustion engine that combusts fuel supplied into a combustion chamber and performs mechanical work directly from the gas generated, a water injection device is provided toward the inside of the combustion chamber to determine the combustion end timing in the explosive combustion stroke in the combustion chamber. A combustion method for an internal combustion engine, characterized in that water is injected from the water injection device toward the high-pressure combustion flame in the combustion chamber, thereby generating water vapor and increasing the output.