JPH01290972A - Mixture gas combusting method for internal combustion engine - Google Patents

Abstract

PURPOSE:To quicken the combusting speed, enhance the engine efficiency, and raise the rate of fuel consumption by allowing the mixture gas in the fuel concentrated part to combust earlier than other mixture gas using No.1 fire seed for spark generation, and combusting the mixture gas in the cylinder with No.2 fire seed formed thereby. CONSTITUTION:A spark is generated in a plug gap between a center electrode 31 and a grounded electrode 32 to combust the mixture gas in the plug gap, and the combustion gas on the spark generation side 3A is repulsed by the tapered surface 38 of a folded part 37 to produce turbulence and dispersion, and the combustion speed in the initial timing of ignition is accelerated, and the mixture gas in the fuel concentrated part 39 is passed through a gas hole 36 and combusted. This combustion gas is used as No.2 fire seed having greater fire power, and the combustion gas repulsed by the tapered surface 38 is accelerated in the direction to the piston side 3B and at the side face inside the cylinder to undergo expansion, and the flame transfer speed in the initial period of ignition is accelerated to complete the initial period combustion of the mixture gas early. This can shorten the total combustion time from the ignition timing till the final period of combustion.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a mixed gas combustion method for an internal combustion engine in which mixed gas in a cylinder is ignited by a spark from an ignition plug to burn the mixed gas.

``Prior Art'' As shown in Figure 1, the basic method of igniting an ignition plug is to weld it to one end of the center electrode (11) of the ignition plug provided at the top of the engine's cylinder and to a metal fixing part (3). Fishing.

Square rod-shaped ground electrode with rectangular ends bent into a letter shape (2)
An appropriate plug gap (Lll (usually Q, 7mm+) is provided between these two ends, and when the engine is running, a ceramic insulator (4) is connected to the center electrode +11 at appropriate times. By applying electricity from the provided terminal (5), a spark was generated in the plug gap (Lll), causing the mixed gas in the cylinder to ignite and explode.

"Problems to be Solved by the Invention" In such spark plugs, conventionally, as shown in Figs. 2 and 3, a rectangular ground electrode (12) bent into an L-shape is used.
are respectively welded from the fixed part (13) to the center electrode (1
A continuous flat plate is formed up to the tip facing 11, and the spark between each electrode +lil (121) burns the mixed gas at the spark generation position (IA), and
The fire spread to I.

In the above conventional technology, the mixed gas in the cylinder becomes turbulent combustion except for the initial combustion immediately after ignition, and after the flame has developed to a certain extent, the combustion speed is accelerated in proportion to the turbulence of the flame spread gas. During the initial combustion stage, the development of the flame is not affected by the turbulence of the mixed gas, so the initial combustion speed is slow until the flame grows to a certain extent, and therefore the overall combustion time from the ignition timing to the final stage of combustion is It is not possible to shorten the length easily, and this poses problems such as the difficulty of accelerating the combustion speed, increasing engine efficiency, and improving fuel efficiency.

[Means for Solving the Problems] However, the present invention provides a combustion method in which a ground electrode is disposed opposite to the tip of a center electrode, and a spark is generated between them to ignite a mixed gas in a cylinder. The flame kernel formed by the above is used as a first pilot flame, and the first pilot flame The mixed gas in the fuel concentration part is combusted earlier than other mixed gases in the cylinder to form a second pilot flame, and the mixed gas in the cylinder is combusted by the second pilot flame. It is something.

``Function'' Therefore, the fuel concentrated part is communicated with the plug gap over a short distance as possible, and the mixed gas in the fuel concentrated part is combusted earlier than other mixed gases in the cylinder, so that sparks are formed. The second pilot flame, which has stronger firepower than the first pilot flame which is the flame kernel, can be easily obtained in the fuel concentration section, and the combustion speed at the initial stage of combustion of the mixed gas in the cylinder can be significantly accelerated. In comparison, the initial combustion time of the mixed gas in the cylinder can be easily shortened, the mixed gas in the cylinder can be completely combusted at a faster combustion rate than before, and high combustion efficiency and extremely excellent fuel efficiency can be obtained.

"Embodiments" Examples of the present invention will be described below in detail based on the drawings. 4 to 7 show one embodiment of the present invention, in which a ground electrode (32) bent into an L-shape has one end facing one end of the center electrode (31), and each of these While an appropriate plug gap is formed between one end, the other end of the ground electrode (32) is welded and fixed to a fixing part (33).

This ground electrode (32) is provided with a plurality of gas holes (36) that penetrate the spark generation position (3A) near the plug gap and the piston side (3B). ) is a bent portion (37) by bending both sides in the longitudinal direction toward the piston side (3B) on the tip side of the L-shape.
(37) is formed on the piston side (3B) opening side of the plurality of gas holes (3G)... and communicates with the gas hole (36)... to open to the piston side (3B). Part (3
9), while tapered surfaces +381 +381 inclined downward (to the piston side) are provided on both side bent portions T371 (371 of the spark generation position (3A) side and on the piston side (3B)). They are formed by each
The width of the ground electrode (32), which is perpendicular to the axial direction of the center electrode (31), is made thicker than this thickness, and the gas hole (36) passing through the center electrode (31) in the axial direction is formed at the center. The ground electrode (32) is provided opposite to the electrode (31), and the longitudinal side edges of the ground electrode (32) opposite to the center electrode (31) are placed on the piston side ( 3B) to form a bent part (371f371), and a ground electrode (32) facing the center mold 14 (311).
The surface has a trapezoidal convex shape, and the ground electrode (32) on the opposite side
A trapezoidal concave surface is formed continuously in the longitudinal direction of the ground electrode (32), and a fuel concentration portion (39) on the piston side (3B) surrounded by the trapezoidal concave surface of the ground electrode (32) is connected to the gas hole ( 36) to communicate with the spark generation side (3A), and the inner diameter of the gas hole (36) is made smaller than the width of the flat part of the trapezoidal convex surface of the ground electrode (32).

This example is constructed as described above, and the center electrode (
By generating a spark in the plug gap between the ground electrode (31) and the ground electrode (32), the mixed gas in the plug gap is combusted, and the spark generation side (A
A bent portion (37) where the combustion gas at l is a trapezoidal convex surface.
The gas hole ( 36), the mixed gas in the fuel concentration section (39) is combusted.

Since the mixed gas in the concentrated portion (39) has a small volume, it is combusted in an extremely short time, and the combustion gas becomes a second pilot flame with a large thermal power, and is connected to the ground electrode (32) forming the concentrated portion (39). The combustion gas is accelerated by this expansion pressure and expands toward the piston side (3B) and the inner surface of the cylinder by repulsing against the Taber surface (38) of the trapezoidal concave bent portion (37) on the piston side (3B), By accelerating the flame propagation speed at the initial stage of ignition, the initial combustion of the mixed gas is completed early.
This makes it possible to shorten the overall combustion time from ignition timing to the final stage of combustion.

As shown in 2, the center electrode (31) and the ground electrode (32)
When a spark is generated and the mixed gas is ignited during
The mixed gas in the fuel concentration part (39) provided on the ground electrode (32) is also ignited from the gas hole (36) at the same time as the spark is generated, and combustion begins. To describe this in slow motion, At the start of combustion, expansion gas naturally occurs in the concentrated part (39) due to the combustion of the mixed gas, and the expansion pressure is limited to the bottom and both side slopes of the fuel concentrated part (39), accelerating the expansion speed of the combustion gas. I decided to do it,
The opening is towards the piston side (3B) and the ground electrode (32
) in the direction of the openings at both ends of the longitudinal direction, the fuel concentration part (39)
While burning this together with the unburned mixed gas, the fire spreads.

That is, if spark generation is the first pilot flame, the mixed gas in the fuel concentration part (39) ignited by this pilot flame is small and burns quickly, producing a powerful fire accelerated by the expansion force of the combustion gas. The fuel concentrating part (39) functions as a bowl by adding flame propagation accelerating force to the thermal power. I can say it.

As is clear from the above, in the combustion method in which the ground electrode (32) is disposed opposite to the tip of the center electrode (31) and a spark is generated between them to ignite the mixed gas in the cylinder, the spark generated by the generation of the A gas hole ( 36 ) through the first
The mixed gas in the fuel concentration part (39) is combusted earlier than other mixed gases in the cylinder by the pilot flame to form a second pilot flame, and the second pilot flame burns the mixed gas in the cylinder. It is something that is burned.

In gasoline reciprocating internal combustion engines, one of the best ways to achieve fuel efficiency is to quickly burn the mixed gas in the cylinder, and ideally during engine operation, at the end of the compression stroke, The combustion occurs at the same time as ignition near the top dead center, and the combustion gas reaches the highest pressure and moves to the working stroke.However, no matter how good the flammability of the mixed gas is at present, it takes some time for combustion to occur. This is impossible, so in current gasoline internal combustion engines, the ignition timing is adjusted and set before the compression stroke reaches top dead center, and a spark is generated and ignited inside the cylinder. Combustion of the mixed gas begins, and the crank stroke slightly exceeds top dead center λ
The setting is such that the combustion gas reaches its maximum pressure at the point when it reaches the maximum pressure and moves to the working stroke. Since the piston moves to obtain the highest pressure, the energy required to resist the combustion gas pressure results in an output loss of the internal combustion engine.The idea of the present invention is to reduce this output loss by using a fuel concentrator (39). The function of the second pilot flame is to accelerate the rate of fire spread and to generate fire spreader gas with strong firepower, which enables early combustion of the mixed gas in the cylinder. Since it has a combustion effect, it is necessary and possible to delay the ignition timing compared to when using conventional spark plugs, and by this adjustment, combustion occurs between the time of ignition and the maximum pressure at top dead center. This reduces energy loss due to resistance to expanding gas pressure, improves engine efficiency, and achieves fuel savings.

“Effects of the Invention” As is clear from the above examples, the present invention has a central electrode (3
1) In a combustion method in which a ground electrode (32) is disposed oppositely at the tip and a spark is generated between these to ignite the mixed gas in the cylinder, the flame kernel formed by the generation of the spark is used as the first pilot flame. , through means (3G) for communicating the fuel concentration part (39) formed on the piston side of the ground electrode (32) and the plug gap over a short distance as possible.
The mixed gas in the fuel concentration part (39) is combusted earlier than other mixed gases in the cylinder by the pilot flame to form a second pilot flame, and the second pilot flame burns the mixed gas in the cylinder. It burns, and the fuel concentration part (3
9) is communicated over a short distance as possible, and the mixed gas in the fuel concentration part (39) is combusted earlier than other mixed gases in the cylinder. The second pilot flame, which has stronger firepower than the fire, is placed in the fuel concentration section (
39), the combustion speed at the initial stage of combustion of the mixed gas in the cylinder can be significantly accelerated, and the initial combustion time of the mixed gas in the cylinder can be easily shortened compared to the conventional method. The mixed gas can be completely combusted at a faster combustion rate than before, resulting in high combustion efficiency and excellent fuel efficiency.

[Brief explanation of the drawing]

Fig. 1 is an overall cross-sectional view showing a conventional example, Fig. 2 is an enlarged cross-sectional view of the main part thereof, Fig. 3 is a bottom view of Fig. 2, and Fig. 4 is a schematic diagram showing an embodiment of the present invention. An enlarged sectional view of the section, Fig. 5 is the 4th section.
6 is an enlarged view taken along line CC in FIG. 4, and FIG. 7 is a sectional view taken along line D in FIG. 4. (31)... Center electrode (32)
... Ground electrode (36)...
Gas hole (39)...Fuel concentration area

Claims (1)

[Claims] In a combustion method in which a ground electrode is placed opposite the tip of the center electrode and a spark is generated between them to ignite the mixed gas in the cylinder, the flame kernel formed by the generation of the spark is used as the first pilot flame, and the ground electrode The first pilot fire makes the mixed gas in the fuel concentrated part higher than the other mixed gases in the cylinder through means for communicating the fuel concentrated part formed on the piston side of the cylinder with the plug gap over a short distance as possible. A mixed gas combustion method for an internal combustion engine, characterized in that a second pilot flame is formed by early combustion, and the mixed gas in a cylinder is combusted by the second pilot flame.