JPH08326635A - Exerting method of effect on directing of fuel in fuel injection valve and fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method not only improving atomization of injected fuel but also influencing the flow direction of fuel in relation to engine load. SOLUTION: In relation to the load state of an internal combustion engine, gas flow is made to flow out through at least one lateral opening 25 at high speed during low load and at low speed during partial and full load. In this case, at least one of a plurality of fuel jets a, b is oriented to influence on orientation of the fuel jets a, b so that a plurality of fuel jets a, b extend in one or in proximity to each other during low load and to such an extent that the influence of gas flow on orientation of the fuel jets a, b can be disregarded during partial and full load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is a method for influencing the orientation of fuel in a fuel injector used in an internal combustion engine, wherein at least two different fuel jets are ejected from the fuel injector. Flow out and direct the gas flow towards the at least one fuel jet through the at least one lateral opening.

The present invention also relates to a fuel injection valve for injecting fuel into an internal combustion engine having two inlet valves for each combustion chamber,
It also relates to a type in which at least two different fuel jets emerge from the fuel injection valve and the gas flow is directed towards the at least one fuel jet through at least one lateral opening. .

[0003]

2. Description of the Related Art German Patent Application Publication No. 302
In the atomizing nozzle for fuel injection known from the document 6832, a high atomization rate of fuel is obtained by supplying air. In this case the air supply is
It is carried out substantially perpendicular to the fuel flow direction and the fuel injection direction via an air supply conduit which is arranged downstream of the nozzle hole and opens in an annular chamber with a ring gap. A single fuel jet exiting the nozzle holes is radially symmetrically surrounded in the vertical plane by the air exiting through the ring gap and serves for improved atomization of the fuel. The single fuel jet is thus atomized compactly, which results in a fuel mist with a spray angle that can be hardly influenced by the air guidance. In this case, the air has only an atomization-improving effect, that is, it is not desired or possible to redirect the fuel.

Further, German Patent Publication No. 4 of the Federal Republic of Germany
In a device for injecting a fuel / gas mixture, which is known from 129834, a pot-shaped gas supply hood is arranged between the valve end of the fuel injection valve and the gas guide. The gas supply hood has a bottom portion and a peripheral wall portion, and the peripheral wall portion is provided with a plurality of gas supply openings.
Then, the gas flows out through these gas supply openings and collides with the injected fuel. From the beginning, the opening cross section of the gas supply opening determines the magnitude of the possible gas throughflow. Due to the gas supply directed towards the injected fuel, a very good atomization of the fuel is achieved. However, even in this known device, there is no influence on the fuel jet direction.

[0005]

The object of the invention is therefore not only to improve the atomization of the injected fuel, but also to influence the direction of the fuel in relation to the load of the engine. And to provide a fuel injection valve.

[0006]

In order to solve this problem, the method according to the invention provides, in a method of the type mentioned at the outset, via at least one lateral opening in relation to the load condition of the internal combustion engine. The gas flow is made to flow at high speed at low load and at low speed at partial load and full load,
In this case, the fuel jets are directed towards at least one of the plurality of fuel jets, such that the plurality of fuel jets extend as a unit or in close proximity to one another at low load. The influence of the gas flow on the direction of the fuel jet at the partial load and the full load is negligible.

In order to solve the above-mentioned problems, in the structure of the fuel injection valve according to the present invention, the gas flow through the at least one lateral opening has a high velocity at a low load and a low velocity at a partial load and a full load. , Impinges on at least one of the plurality of fuel jets, so that at low load the fuel jet is directed towards one inlet valve and at partial load and at full load the gas flow The fuel jet according to is directed towards both inlet valves.

[0008]

The method according to the invention has the following advantages over the known ones. That is, in the method according to the present invention, it is possible to inexpensively and easily use the gas, which has conventionally worked only for improving the atomization of the fuel, also for influencing the jet direction of the fuel. . This makes it possible, for example, to achieve optimum fuel injection for internal combustion engines of the variable inlet valve control type.

To this end, in connection with the load, the gas is preferably blown towards the fuel injected through the fuel injector. In the variable inlet valve control type, in order to generate a desired swirl in the combustion chamber in the low load range of an internal combustion engine having, for example, two inlet valves for each combustion chamber,
It is desirable to operate only one inlet valve. On the other hand, it is desirable to utilize both inlet valves for supplying the air-fuel mixture at the partial load and the full load. Variable inlet valve control in an internal combustion engine with two inlet valves ideally requires two jet valves at partial load and full load, and in the low load range the inlet valve operated at low load. Only a single jet valve is needed to supply the mixture. The method according to the invention makes it possible to solve such problems very easily. This is because in the method according to the invention the fuel injection valve can be used as a two-jet valve or as a single-jet valve in connection with the load by means of the gas supplied. The relationship to the load is given through the pressure difference between the ambient environment and the intake pipe atmosphere. At low load, a high pressure difference results at the injection valve with a large gas flow, whereas at high load a correspondingly low pressure difference occurs with a small gas flow.

Furthermore, of course, the invention also offers the advantages already known from the prior art, namely the improvement of atomization of the fuel by the gas blown in.

Further, the fuel injection valve according to the present invention constructed as in the present invention has the following advantages. That is, with the fuel injection valve according to the present invention, it is possible to implement optimum fuel injection in an internal combustion engine of variable inlet valve control type.

Another advantageous configuration of the method according to the invention is described in claim 2 and another advantageous configuration of the fuel injection valve according to the invention is described in claim 4.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described with reference to the drawings.

In FIG. 1, a valve in the form of a fuel injection valve for a fuel injection device of a mixture compression type external ignition type internal combustion engine is partially illustrated as an embodiment. The fuel injection valve 1 injects the fuel / gas mixture into the intake pipe of the internal combustion engine. Fuel injection valve 1 with valve longitudinal axis 5
At the valve end 3 projects into a longitudinal bore 7 of a gas guide 9 made of, for example, aluminum or plastic. The fuel injection valve 1 is arranged, for example, in the valve housing opening 11 of the intake pipe 13 together with the gas guide body 9.

On the outer peripheral portion of the gas guide body 9, for example, an upper annular groove 15 and a lower annular groove 17 are formed. An upper seal ring 19 is arranged in the upper annular groove 15, and a lower seal ring 21 is arranged in the lower annular groove 17. Upper and lower seal rings 19, 20
Are in close contact with the inner wall of the valve housing opening 11 of the intake pipe 13. A gas supply passage 23 is provided in the intake pipe 13, and the gas supply passage 23 can serve to supply gas to the plurality of gas guide bodies 9. Gas supply passage 2
3 is, for example, preferably as follows: the gas supply passage 23 is between the upper annular groove 15 with the upper sealing ring 19 and the lower annular groove 17 with the lower sealing ring 21. Is tangential to the valve housing opening 1 of the intake pipe 13
It is configured to open at 1. Orientations other than the orientation of the gas supply passage 23 shown in FIG. 1 are possible, for example a gas supply passage extending perpendicular to the tangentially extending gas supply passage 23 is also possible, and so on. The gas supply passage thus extends in the radial direction with respect to the valve end 3 of the fuel injection valve 1.

The gas guide 9 has a lateral opening 25 extending axially between the upper and lower sealing rings 19 and 21, for example perpendicular to the valve longitudinal axis 5. This lateral opening 25 extends through the wall of the gas guide body 9 and serves for supplying gas into the longitudinal bore 7 of the gas guide body 9 downstream of the valve end 3.

The valve end 3 of the fuel injection valve 1 has a nozzle body 26 with a continuous longitudinal bore 27. The longitudinal hole 27 is provided with a stationary valve seat 29 that is tapered in the shape of, for example, a truncated cone in the fuel flow direction.
9 cooperates with the valve closing member 31. The valve closing member 31 is connected to the mover 33 at an end portion opposite to the stationary valve seat 29. The mover 33 cooperates with a magnet coil 35 that partially surrounds the mover in the axial direction, and a core 37 that faces the mover 33 in the direction opposite to the stationary valve seat 29. The sealing section 39 of the valve closing member 31, which cooperates with the stationary valve seat 29, is tapered, for example in the form of a truncated cone in the direction of fuel flow. A return spring 41 is in contact with the end of the valve closing member 31 connected to the mover 33 at one end thereof. Return spring 41
Is the other end, for example a non-magnetic adjusting sleeve 43
Supported by. The return spring 41 tends to move the valve closing member 31 towards the stationary valve seat 29.

A plate 47 with holes is arranged on the end surface 45 of the nozzle body 26 opposite to the core 37. The perforated plate 46 has two or four injection openings 49 formed, for example, by punching or erosion,
These injection openings 49 are inclined outwards with respect to the valve longitudinal axis 5 in the fuel flow direction, and through these injection openings 49 the valve seat immovable when the valve closing member 31 is lifted. Fuel flowing by rubbing 29 is injected. In any case, the perforated plate 47 has a contoured injection opening 49 in which at least two fuel jets (see the dashed lines indicated by the letters a and b in FIG. 1) are produced. In this way a so-called two jet valve is obtained, which makes it possible to inject a fuel jet towards each one of the two inlet valves 52 of the combustion chamber of the internal combustion engine. Perforated plate 47
Are connected to the valve end 3 by welding, for example.

FIG. 3 shows a simplified view of the valve end 3 from below. As is clear from FIG. 3, 2
The two separate fuel jets a, b can also be produced by four injection openings 49 provided in the perforated plate 47. Furthermore, from this FIG. 3 it is clear that the asymmetrical gas supply mode takes place via the lateral openings 25.

The two-jet design of the fuel injection valve 1 can be obtained with different and different structural solutions.
In this case, it is not absolutely necessary to use a perforated plate 47 in which, for example, two or four injection openings 49 are formed. For example, the injection valve can have a single jet nozzle (one injection passage, no perforated plate), in which case the single jet nozzle has, for example, one downstream
The two jet distributors are connected so that the fuel is not distributed directly by the injection openings 49 of the perforated plate 47.

Stepped longitudinal hole 7 of gas guide 9
Has a step portion 55 extending inward in the radial direction downstream of the valve end portion 3 of the fuel injection valve 1 in the fuel flow direction. The lateral opening 25 in the gas guide 9 is configured, for example, in such a way that the gas flowing through the gas guide 9 impinges on the fuel injected through the injection opening 49, just downstream of the perforated plate 47. Has been done. The lower limit of the lateral opening 25 is, for example, transferred directly to the step 55, so that the gas flowing therethrough is step 55.
Partially guided towards the fuel. The lateral opening 25 or step 55 may be configured to overhang toward the valve longitudinal axis 5 much more than shown in the embodiment of FIG. With this configuration, the gas can impinge on the fuel in a more targeted manner, which can have a more precise influence on the fuel orientation. By correspondingly shaping the lateral opening 25 with a defined cross-section, the calibrating of the gas flow, the so-called calibration (Kali).
brierung) can also be done.

The gas, which is supplied via the gas supply passage 23 and flows out in the form of a jet from the lateral opening 25, collides with the injected fuel, in which case the gas supply type is asymmetric. One fuel jet (fuel jet b in FIG. 1) can be pushed or deflected in the direction of the arrow towards the other fuel jet a. Such desired jet diverting or merging of the jets into one fuel jet in the defined load range of the internal combustion engine is described in detail below. Furthermore, the gas atomizes the fuel particularly finely, which results in the formation of a homogeneous fuel-gas mixture.

The object of the present invention is to provide the fuel injection valve 1 described above.
And a gas guide 9 for simple variable inlet valve control in a mixture compression external ignition internal combustion engine, in particular a three-valve or four-valve engine with two inlet valves 52 per combustion chamber And to realize the optimum fuel supply. The variable inlet valve control produces a desired swirl in the combustion chamber by operating only one inlet valve 52 in the low load range of an internal combustion engine with two inlet valves 52 per combustion chamber. be able to. On the other hand, at partial load or full load, it is desirable to use both inlet valves 52 for supplying the air-fuel mixture. In known internal combustion engines with two inlet valves per combustion chamber, injection valves with two jet characteristics are used, the fuel jets of each such injector being directed towards a respective one inlet valve. ing. The variable inlet valve control in the two inlet valves 52, however, ideally requires two jet valves at partial and full load, and in the low load range only fuel is applied to the inlet valve 52 operating at low load. It requires a single jet valve to supply. Using the fuel injection valve 1 described above, 2
It is desirable to control the fuel orientation at the jet valve in relation to the load.

FIG. 2 shows a part of the internal combustion engine in a sectional view. As the gas for directing the fuel and for atomizing the fuel well, for example, intake air branched by a bypass in front of the throttle valve in the intake pipe of the internal combustion engine (FIG. 2), and pressure-fed by the secondary blower. Air, or the returned exhaust gas of an internal combustion engine, or a mixture of air and exhaust gas can be used. By using the returned exhaust gas, the emission of harmful substances of the internal combustion engine can be reduced.

The gas supplied at a high rate by means of the pressure drop between the intake pipe 13 downstream of the throttle valve and the surrounding environment upstream of the throttle valve,
The fuel jets a and b flowing out from the fuel injection valve 1 can be influenced. According to the invention, such an influence on the direction of the fuel jet takes place through the lateral opening 25 in the gas guide 9 towards the at least one fuel jet b, a precisely directed and targeted gas. Is performed in relation to the load. The directing of the injected fuel is achieved by the gas load-related supply. When the engine load is low and therefore the gas velocity is high, the fuel jet b of the two jet valve is blown or deflected towards the fuel jet a, so that both fuel jets a, b Directed towards one inlet valve 52 to be operated, either as a combined fuel jet or as two individual jets extending substantially close to each other. In this case, the original two-jet valve is almost one inlet valve 5 for each combustion chamber, as shown in FIG.
It will act as a 1-jet valve in which injection is performed toward 2.

The size of the free cross section of the transverse opening 25 is selected according to the required gas throughflow and influences the metered gas quantity and pressure.
Further, the cross-sectional shape and position of the lateral opening 25 is an important criterion for the fuel jets a and b, that is, an important criterion for adjusting the fuel jet angle in relation to the engine load and thus the intake pipe pressure.

Instead of one lateral opening 25, a plurality, for example two, of exactly opposite lateral openings 25 may be provided in the gas guide 9 for blowing air. In such a case, however, it is necessary that the cross-sectional dimensions (and possibly the shapes) of the lateral openings 25 differ significantly from one another, so that the gas jet impinging on the injected fuel causes
The fuel jet can be redirected and an asymmetrical jet shape is produced, that is, the mixture is supplied to only one inlet valve 52 at a low engine load.

[Brief description of drawings]

FIG. 1 is a sectional view partially showing a fuel injection valve.

FIG. 2 is a cross-sectional view showing a part of an internal combustion engine.

FIG. 3 is a view from below of the valve end.

[Explanation of symbols]

1 Fuel Injection Valve, 3 Valve End, 5 Valve Longitudinal Axis, 7 Longitudinal Hole, 9 Gas Guide, 11 Valve Housing, 13 Intake Pipe, 15, 17 Annular Groove, 1
9,21 Seal ring, 23 Gas supply passage, 2
5 lateral opening, 26 nozzle body, 27 longitudinal hole, 29 valve seat, 31 valve closing member, 33 mover, 35 magnet coil, 37 core, 39
Seal section, 41 Return spring, 43 Adjustment sleeve, 45 End surface, 47 Hole plate, 49
Injection opening, 55 steps

Claims (4)

[Claims] 1. A method for influencing the orientation of fuel in a fuel injection valve used in an internal combustion engine, wherein at least two different fuel jets exit from the fuel injection valve and at least In the type in which the gas flow can be directed towards one fuel jet through the at least one lateral opening, the at least one lateral opening (25) is provided in relation to the load condition of the internal combustion engine. Through which the gas flow flows at high speed at low load and at low speed at partial load and full load,
In this case, at least one of the plurality of fuel jets (a, b)
The fuel jets (a, b) in such a manner that the plurality of fuel jets (a, b) extend as one unit or extend in close proximity to each other at low load. The influence on the direction of the fuel jets (a, b) by the gas flow at the time of partial load and full load is negligible.
A method of influencing the orientation of fuel in a fuel injector. 2. In an internal combustion engine having two inlet valves (52) for each combustion chamber, the fuel jets (a, b) of the fuel injector (1).
The method according to claim 1, wherein is directed towards one inlet valve (52) at low load and towards both inlet valves (52) at partial load and full load. 3. A fuel injection valve for injecting fuel into an internal combustion engine having two inlet valves for each combustion chamber, wherein at least two different fuel jets flow from the fuel injection valve and at least 1 In the type in which the gas flow is directed towards one fuel jet through at least one lateral opening, the gas flow through at least one lateral opening (25) has a high velocity at low loads. In addition, the fuel jet collides with at least one of the plurality of fuel jets (a, b) at a low speed under partial load and full load, and as a result, the fuel jet (a, b
b) is directed towards one inlet valve (52),
A fuel injection valve, characterized in that the fuel jets (a, b) due to the gas flow are directed toward both inlet valves (52) at partial load and full load. 4. The fuel injection valve (1) is at least partially surrounded by a gas guide (9), the gas guide (9) being provided with at least one lateral opening (25). The fuel injection valve according to claim 3.