DE102018207997A1 - Internal combustion engine - Google Patents

Abstract

Internal combustion engine with a fuel / water emulsion injection directly into a combustion chamber of the internal combustion engine by means of a first injector, wherein a first adjustment of a mixing ratio of a fuel portion to a water portion injector near or in the injector, wherein a second injector is provided for introducing a fuel / water Emulsion directly into the combustion chamber with an independent of the first setting, injector near or taking place in the injector second setting a mixing ratio of a fuel fraction to a water content.
The embodiment of the invention, highest performance of the internal combustion engine can be displayed with controllable emission.

Description

The invention relates to an internal combustion engine with a fuel / water emulsion injection directly into a combustion chamber of the internal combustion engine with the features of the preamble of patent claim 1.

The technical environment, for example, the German patent specification DE 100 26 695 C1 pointed. From this patent a method and a device for recovering water from an exhaust system are known. The invention relates to a method and a device for generating a required amount of water by condensation of the water vapor contained in the exhaust gas, in particular for a water injection system of the internal combustion engine. Here, the condensed water is guided with a line arrangement and stored in a container. According to the invention, the required amount of water is condensed out of the exhaust gas by means of a condensation device which has an average condensation efficiency of at least 25%, preferably at least 50%, over the entire operating range of the internal combustion engine. In this way, a provision of additional water is avoided in a separate and refillable tank and still allows a permanent recovery of water from the exhaust gas.

Next is from the European patent EP 2 789 839 B1 a method for water injection for an internal combustion engine, in which only in certain load ranges of the internal combustion engine water is injected via first injectors in the combustion chambers of the internal combustion engines. Thus, depending on the load range, fuel is injected either directly via the first injectors into the combustion chambers of the internal combustion engine or via second injectors into a suction pipe upstream of the combustion chambers. In a third load range, which is substantially at full load in a medium speed range, water is injected via the first injectors into the combustion chambers and fuel is injected into the intake manifold exclusively via the second injectors.

The technical environment is further on the European patent specification EP 2 778 381 B1 pointed. From this a method for operating an injection system for injecting water into an injection region of an internal combustion engine by means of an injector with a water-filled in a normal operation of the internal combustion engine working space is known. In the method, when the internal combustion engine is switched off, at least part of the water present in the working space of the injector is displaced by a gas mixture flowing into the working chamber from the combustion chamber of the internal combustion engine and the working space is at least partially filled with the gas mixture.

• - Erfassen einer Klopfstärke in dem Zylinder mittels eines Klopfsensors,
• - Einstellen eines einer Soll-Abgastemperatur entsprechenden vorbestimmten Soll-Zündwinkels des Zylinders und
• - Steuern einer Fluidbeimischung in den Zylinder in Abhängigkeit von der erfassten Klopfstärke.

Next is from the European patent application EP 3 023 619 A1 , from which the present invention is based, discloses a method for controlling combustion in an internal combustion engine having at least one cylinder, the method comprising the following steps:

• Detecting a knock magnitude in the cylinder by means of a knock sensor,
• - Setting a desired target exhaust gas temperature corresponding predetermined target ignition angle of the cylinder and
• Controlling a fluid admixture into the cylinder as a function of the detected knock intensity.

Next is from the unpublished German patent application DE 10 2017 219 369 a method for preventing the icing of an injection system of an internal combustion engine known. Described in this publication is a generic internal combustion engine.

It is known that the fuel droplets the water droplets, the energy of the environment, ie the combustion air, take away, as they evaporate faster and thus the evaporation cooling effect of direct water injection while injecting the required amount of fuel in the same place in the combustion chamber is only partially effective. Thus, for generic internal combustion engines not the highest performance at the same time best emission capability can be displayed.

Object of the present invention is to avoid the above drawback.

This object is achieved with an internal combustion engine having the features in the characterizing part of patent claim 1.

Advantageous developments of the invention are described in the subclaims.

According to the invention, a double direct injection of a fuel / water emulsion is proposed directly in the combustion chamber of the internal combustion engine. Here, an individually controllable, known Zumischmöglichkeit for water is provided, d. H. every direct injection injector receives an individual amount of water. The inventive proposal highest performance for the internal combustion engine can be displayed, at the same time best emission.

The embodiments according to claim 2 and 3 are particularly preferred embodiments.

The embodiments according to claim 4 and claim 5 allow easy production of the cylinder heads, at the same time least package problems.

• 1 zeigt sehr schematisch einen Schnitt durch eine erfindungsgemäße Brennkraftmaschine.

In the following, the invention is explained in more detail with reference to a single figure.

• 1 shows very schematically a section through an internal combustion engine according to the invention.

1 shows very schematically a section through an internal combustion engine according to the invention 1 , A combustion chamber 2 is through a combustion chamber roof of a cylinder head 6 in which two gas exchange valves 5 are arranged, an unnumbered cylinder wall and a piston roof of a piston 9 limited. An intake passage for a fresh air is denoted by 7, an exhaust passage for an exhaust gas is with 8th quantified. An inflowing fresh air is schematically indicated by an arrow in the inlet channel 7 shown. A flow direction of the exhaust gas is also schematically indicated by an arrow in the exhaust duct 8th shown.

A first injector 3 is largely central between the gas exchange valves 5 in the combustion chamber roof of the cylinder head 6 the internal combustion engine 1 arranged. A second injector 4 is laterally in the area of the inlet channel 7 in the cylinder head 6 arranged. Alternatively, the second injector 4 also in the area of the outlet channel 8th in the cylinder head 6 be arranged. Adjacent to the first injector 3 is located largely centrally in the combustion chamber roof of the cylinder head 6 furthermore, an ignition device 10 ,

A supply of water to the first injector 3 and to the second injector 4 is represented symbolically by a dashed arrow. A supply of fuel (HC) is indicated by a solid arrow in the direction of the first injector 3 and the second injector 4 shown. An adjustment of a mixing ratio of a fuel fraction to a water fraction takes place in each case near the injector and / or in the first injector 3 and / or in the second injector 4 ,

According to the invention, the adjustment of the mixing ratio of the fuel fraction to the water content in the first injector 3 independent of the second injector 4 , Thus it is possible for every injector 3 . 4 to represent an individual Wasserzumischung.

Particularly preferred is for the first injector 3 provided a first, not shown fuel rail and for the second injector 4 a second, also not shown fuel rail provided. At each fuel rail and several injectors can be arranged, ie for each cylinder of the internal combustion engine a separate. It follows that the embodiment of the invention for each internal combustion engine 1 can be used, regardless of the number of cylinders. Alternatively, also for both injectors 3 . 4 a single fuel rail can be provided.

With the proposed embodiment of the internal combustion engine 1 are now the highest performance levels for internal combustion engines 1 representable, at the same time the best possible emission.

LIST OF REFERENCE NUMBERS

1.

Internal combustion engine

Second

combustion chamber

Third

first injector

4th

second injector

5th

Gas exchange valve

6th

cylinder head

7th

inlet channel

8th.

exhaust port

9th

piston

10th

detonator

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10026695 C1 [0002]
• EP 2789839 B1 [0003]
• EP 2778381 B1 [0004]
• EP 3023619 A1 [0005]
• DE 102017219369 [0006]

Claims (5)

Internal combustion engine (1) with a fuel / water emulsion injection directly into a combustion chamber (2) of the internal combustion engine (1) by means of a first injector (3), wherein a first adjustment of a mixing ratio of a fuel fraction to a water content near the injector or in the first injector (3 ), characterized in that a second injector (4) is provided for introducing a fuel / water emulsion directly into the combustion chamber (2) with a second setting of one independent of the first setting, near the injector or in the second injector (4) Mixing ratio of a fuel fraction to a water content. Internal combustion engine after Claim 1 , characterized in that a first fuel rail is provided for the first injector (3). Internal combustion engine after Claim 1 or 2 , characterized in that a second fuel rail is provided for the second injector (4). Internal combustion engine according to one of Claims 1 to 3 , characterized in that the first injector (3) is arranged substantially centrally between gas exchange valves (5) in a combustion chamber roof of a cylinder head (6) of the internal combustion engine (1). Internal combustion engine according to one of Claims 1 to 4 , characterized in that the second injector (4) is arranged laterally in the region of an inlet (7) or outlet channel (8) in the cylinder head (6).

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