DE2031113C3 - Air-compressing four-stroke piston engine - Google Patents

Description

The invention relates to an air-compressing Viertakl injection burner honing machine. in the first phase of the sealing stroke the fluffy burnout air. e.ne smaller warm menu / is performed

ΤΆ ^ u ίΖη erdichtenden Vier.akt-piston internal combustion engines! Lower with fuels cetane number or with normal fuel at abnormally low compression ratio occur especially in the partial load range due to the lord sighted there low temperature level to known ignition trouble. In order to ignite with safety in all areas of operation, various aids are known, through which more favorable ignition conditions. in particular local or general temperature increases are created
^V It is known (German patent 2K7 366j to inject a small amount of fuel before or at the beginning of the compression stroke, the ignition of which is favored by the longer residence time in the cylinder due to the spontaneous ignition. The automatic ignition occurs either at the same time or immediately before the ignition of the main amount of fuel injected later ff

It is also known (German patent 749 356), shortly before the main injection, a small one Amount of low-viscosity and easily igniting fuel inject. Through the combustion of the pre-injected, easily igniting fuel the temperature of the pre-compressed combustion air increases as soon as the ignition temperature is reached of the ignition fuel is reached. There are difficulties associated with providing two types of fuel. In addition, a relatively large amount of fuel must be used to increase the temperature of the compressed air are pre-injected, whereby the combustion air available for the main injection is greatly reduced

According to the German Patenlsehrifl 733 \ 2H there is an externally ignited, pre-injected alarm signal for the immediate ignition of the ι ι ι; Hiiintflüse injected fuel / u through U <- "iJP ¹ "" ^B _tL .» Flame glow plug, stürt

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-5 a uniform temperature increase in the cylinder space as a result, the heat transfer to the components during compression is unfavorably demanded Due to the generally high temperature level are also the peak temperatures during

Burns very high, which leads to increased NO formation

leads. ,.

The invention is based on the object Internal combustion engines of the type described at the beginning of the ignition conditions by a load / u-

was largely independent, local increase in To improve the final compression temperature without significantly worsening the charge of the cylinders and to disrupt the combustion process. This Aufiiabc is according to the invention by tine device with an ignition aid for injecting a small. Immediately externally ignited amount of fuel in the working cylinder in the first phase of the compression stroke solved. Compared to the admixture of exhaust gases, the heat supply provided according to the invention has

the great advantage that it can take place independently of the load. Even in the case of partial delicacies, the Pre-combustion generated amount of exhaust gas the same. Stand over the entire operating range of the machine, so a sufficient amount of heat is always available

supply.

Furthermore, the pre-combustion disrupts that already at the time of ignition of the main amount of fuel is complete, the main combustion is not, but favors its ignition by the single locally limited temperature increase. Due to the local limitation that with internal combustion engines rotating air movement promoted by the thermal segregation arise during the Compression at these points temperature increases, through which the combustion products in a are dissociated to a high degree and have an accelerating effect on the subsequent combustion process.

In an embodiment of the invention, there is an injection valve for the small amount of fuel to be pre-injected and an ignition aid in a breakthrough provided in the area of the crankshaft-side dead center position of the working piston in the working cylinder

«. • hung arranged. The injection valve and the ignition aid are separated from the compression space as compression progresses and thus not from Compression and ignition pressures are applied. Pie related components can as a result be simple be designed and leave a great functional ability expect. In addition, with this arrangement, the air movement during combustion not disturbed by these components.

This is part of the further development of the invention Pre-injection at full load by hand or automatically depending on some independent Greatness off. After switching off, the small one that was used up by the pre-combustion is also available Amount of oxygen is still available for the main combustion and causes an increase in performance.

In the drawing, an exemplary embodiment of the invention is shown.

A b b. 1 shows a cylinder and an associated piston of an air cooling system according to the invention Internal combustion engine in longitudinal section:

Fig. 2 shows a cross section through the same Cylinder along the line II-II in Fig. 1.

In the two pictures the cylinder is with 1 and the associated piston is denoted by 2. LeIzlerer is in the position shown in its KurhelwellenseiiigenTolpunkilage. In cylinder 1 The combustion air circulates during the intake stroke and during the compression stroke Movement around the cylinder length axis in the direction indicated by an arrow in Fig. 2. Just above the piston testicle, the cylinder 1 has an opening 3, in front of which, as shown in FIG. 2

1 ″ clearly shows an injection nozzle 4 on the outside and a glow plug 5 are arranged in such a way that the fuel jet 6 exiting from the injection nozzle 4 is directed towards the opening 3 and the filament 7 of the glow plug 5 protrudes into this beam. The fuel-air mixture reaching the coil 7 ignites and ignites of the fuel entering the cylinder 1 and evaporating. The combustion gases arrive as a result of the rotation of the combustion air

2 "during compression in the rotational molds Combustion chamber 8 in the piston 2. where they In: ·, towards the end of the Compression remains and thus in the right place accelerating the then onset Act on the main burn.

1 sheet of drawings

Claims (3)

Patent claims: 1. Air-compressing four-stroke injection internal piston engine, in the case of the combustion air drawn in in the first phase of the compression stroke a small amount of heat is supplied, characterized by a groove (4) with an ignition aid (5) for injecting a small, immediately externally ignited amount of fuel in the cylinder (1) in the first phase of the compression stroke. 2 internal combustion engine according to claim 1 characterized in that an injection valve (4 for di ⁸ e voreinzuspritzende small 'amount of fuel and a starting aid (5) of the working piston (2) arranged in a region of the big-end dead center position provided in the cylinder (I) perforation (3) are. 3. Internal combustion engine according to claims 1 and 2, characterized in that the pre-injection manually or automatically depending on