WO2016016229A2 - Brennkammergestaltung eines vcr-motors - Google Patents
Brennkammergestaltung eines vcr-motors Download PDFInfo
- Publication number
- WO2016016229A2 WO2016016229A2 PCT/EP2015/067251 EP2015067251W WO2016016229A2 WO 2016016229 A2 WO2016016229 A2 WO 2016016229A2 EP 2015067251 W EP2015067251 W EP 2015067251W WO 2016016229 A2 WO2016016229 A2 WO 2016016229A2
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- WO
- WIPO (PCT)
- Prior art keywords
- piston
- cylinder
- injection
- internal combustion
- combustion engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/04—Varying compression ratio by alteration of volume of compression space without changing piston stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0618—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston having in-cylinder means to influence the charge motion
- F02B23/0624—Swirl flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0663—Details related to the fuel injector or the fuel spray having multiple injectors per combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
- F02B2023/103—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector having a multi-hole nozzle for generating multiple sprays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
- F02B2023/106—Tumble flow, i.e. the axis of rotation of the main charge flow motion is horizontal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
- F02B2023/108—Swirl flow, i.e. the axis of rotation of the main charge flow motion is vertical
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
- F02B31/04—Modifying induction systems for imparting a rotation to the charge in the cylinder by means within the induction channel, e.g. deflectors
- F02B31/06—Movable means, e.g. butterfly valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a VCR reciprocating internal combustion engine having an adjustable change in compression ratio and a method of changing a compression ratio of a cylinder of a reciprocating internal combustion engine.
- Adjusting the compression ratio in a VCR reciprocating engine allows one to vary the distance between the cylinder head and the piston at top dead center.
- Such is known for example from DE 10-A-2005 055 199.
- a higher or even lower compression may be sought.
- the compression ratio is optimized according to specifications such as exhaust gas limits or efficiencies.
- Object of the present invention is to make a mixture formation as similar as possible even with two differently adjustable compression ratios in the respective combustion chamber.
- the invention proposes a reciprocating internal combustion engine according to claim 1, 4, 7 or 8 and a method according to claim 11.
- Advantageous features, embodiments and further developments will become apparent from the following description, the figures as well as from the claims, wherein individual features of an embodiment are not limited to these. Rather, one or more features are from one Embodiment with one or more features of another embodiment to further embodiments linked.
- the respective independent claims can also be combined with each other.
- One or more features of the claims can therefore be exchanged as well as omitted, but also be supplemented in addition.
- the features cited with reference to a specific exemplary embodiment can also be generalized or used in other exemplary embodiments, in particular applications as well.
- a reciprocating internal combustion engine having an adjustable compression ratio of a cylinder by means of a variable distance of the compression piston of the cylinder to the cylinder head at top dead center (TDC) is proposed, preferably by changing the effective length of the connecting rod, wherein the geometry of the bottom of the compression piston has a trough shape is bordered and has a Verdichtkolbenrandgeometrie which is employed, preferably so that at each different distance of the piston in TDC to the cylinder head, in particular set differently effective Pleueland, an in the direction of the compression piston edge migratory injection beam is deflected in the direction of the trough shape.
- piston the geometry of the compression piston (hereinafter referred to as piston), but also by other, the combustion chamber determining parameters, despite changing the compression, for example, a swirl flow approximately equal to perform in the respective combustion chamber , This helps in the effective mixture formation but also, for example, in the combustion in the combustion chamber.
- the combustion chamber itself is due to the Zylinderboh- tion on the one hand, on the other hand by the specified piston geometry and the
- Cylinder roof so determined that their interpretation usually a compromise between all possible different operating points and thereby must be prevailing conditions.
- a further embodiment of the invention provides that the Hubkol- benbrennkraftmaschine cylinder, which have a piston in which the piston edge geometry has a circumferential, employed chamfer.
- the flow in the combustion chamber is guided in a more targeted manner to a swirling flow, in particular if the distance between the piston and the injector changes because of the simplified effective connecting rod length.
- a deflection in the direction of the piston recess is preferably made possible and avoided, for example, that an injector jet impinges on the piston crown.
- the chamfer preferably runs completely around the piston recess, but may also be interrupted, for example by valve pockets.
- the raising of the chamfer preferably forms a plane, but at least a concave shape whose direction leads into the center of the piston. For example, it can be provided that the edge drops more towards the edge of the piston than in the direction of the piston recess.
- Yet another embodiment has a piston geometry that can be used independently as well as with the previous combined.
- the reciprocating internal combustion engine has at least one cylinder on a piston whose piston edge geometry has an at least approximately circumferential increase, which drops towards the interior to the trough shape.
- the increase can for example result in a boundary, the outlet of which leads to the inside but preferably to the piston recess.
- a further development of the invention which, in conjunction with the above thought as well as independently, is pursued as an independent thought can, provides that the reciprocating internal combustion engine allows the adjustment of the effective connecting rod length for changing the compression ratio in the cylinder, wherein the cylinder has an injector, which uses different injection holes along the injector depending on the set compression ratio.
- An embodiment provides that a two- or multi-row injector is used. If the compression ratio is lowered and thereby increases the distance between the piston head and the cylinder roof in the upper TDC, preferably those injector holes are used for injecting the fuel, which lie on the piston facing the lower end of the injector. If, however, the compression ratio is increased and thus the distance shortened, preferably injector holes are used which sit above the injector holes arranged at the bottom of the injector.
- the distance between the piston head and the injection hole of the injector actively injecting changes the effective length of the connecting rod in a respective TDC by activating injection holes of the injector arranged at different heights above the piston head at least approximately equal is.
- a point in the piston recess on which a center line of a spray jet of the injector geometrically aims in the TDC is at least approximately the same.
- a further variant according to the invention provides that, for example, the injection time, the injection mass as well as the distribution of the injection mass over the injection time are adapted to the respective compression ratio.
- another thought which can be pursued in conjunction with one or both of the above thoughts as well as independently as an independent thought, provides that the reciprocating internal combustion engine an adjustment of the effective connecting rod length for changing the compression ratio of a cylinder, wherein the cylinder has a first and a second injector, which each allow a differently directed injection depending on the set effective connecting rod length.
- both injectors are arranged side by side in the cylinder roof, but each have a different inclination with respect to the cylinder axis.
- an injector can be arranged approximately centrally in the cylinder roof, while the other injector is arranged offset therefrom.
- the injectors can be made available by choosing the injector for the injection, a different number of injection holes but also injection angles.
- one of the two injectors may be located in an area near the cylinder shell.
- a first subset of the first and a second subset via the second injector are injected into the combustion chamber.
- pre-injection, main injection and post-injection can be divided differently, whereby here also the possibility exists to control or regulate this as a function of the distance of the piston to the cylinder head in the TDC or the set compression ratio.
- Another thought in conjunction with one or more of the above Thoughts as well as independently can be pursued as an independent thought, provides that the reciprocating internal combustion engine Ver ⁇ position of the effective connecting rod length for changing the compression ratio of a cylinder allows, the injector is at least partially arranged such movable in the cylinder head that the position one or more injection holes of the injector relative to the cylinder head in dependence on the set effective connecting rod length is adjustable.
- variable valve train can be used to contribute in the cylinder for generating a swirl in the combustion chamber, in particular to cause a swirl through the open position of at least one intake valve, preferably two intake valves.
- the inlet valve does not necessarily have to be fully opened. Rather, it can only partially release the inlet opening and thereby cause a targeted inlet flow, which leads to a swirl in the combustion chamber.
- a swirl generator is used for producing a combustion chamber flow swirl as a function of the compression ratio.
- it can be used for a sheet metal, as is apparent, for example from DE-A-199 60 626. The content of this document is hereby incorporated by reference into the disclosure of the present patent application.
- Another aspect of the invention provides a method of changing the compression ratio of a cylinder of a reciprocating internal combustion engine by adjusting the effective connecting rod length before, preferably with a reciprocating piston internal combustion engine as described above, wherein depending on the adjustment, a parameter of the cylinder relating to the injection is mitver Robinson.
- a change in the compression ratio can be achieved in different ways. So it is possible to provide an eccentrically mounted crankshaft. Another option is to change the effective length rods ⁇ so that it is possible also to change the compression ratio.
- the connecting rod itself can be mounted on the crankshaft eccentrically ver ⁇ adjustable and / or the piston pin is mounted eccentrically adjustable on the connecting rod.
- the VCR piston engine may be designed, as described in each case by way of example from DE-A-10 2005055 199, DE-A-10 2011 056298, DE-A-10 2012 014 917, DE-A-10 2011 108 790, DE- A-10 2010 061 360, DE-A-10 2010 061 359, DE-A-10 2010 061 361, DE-A-10 2014 004 987 and / or DE-A-10 2008 005 467.
- the known from these documents possible constructions of the connecting rod with eccentric adjustment of the compression piston, the adjusting mechanism and the support cylinder or support ⁇ piston and its operation and the other contents of these publications are hereby incorporated by reference to the subject of the present patent application.
- One way to change a parameter is to influence the injection flow as a function of the effective connecting rod length.
- the injection flow can be influenced by the various injection holes, injection angles or also injectors.
- injection in particular the injection jet
- the injection quantity, the injection pressure or the injection angle as well as the beam geometry to change is another possibility for changing a further parameter.
- the compression ratio of a reciprocating internal combustion engine can be set simultaneously for all cylinders or for all cylinders of a cylinder bank or can be adjusted for the individual cylinders of the reciprocating internal combustion engine, in all cases mentioned above either actively or passively.
- the geometry of an engine component such as the connecting rod length, the crankshaft radius, the bearing of the crankshaft and / or the storage of the compression piston on the connecting rod and thus the effective connecting rod length is preferably changed. This is preferably done hydraulically, i. using a medium.
- the motor oil is especially suitable as a medium.
- the active adjustment means that by the action of external adjusting forces on the adjustment mechanism, an adjustment of the engine component in question is achieved.
- the passive adjustment means that forces acting on the engine component during operation of the internal combustion engine, such as the gas pressure forces and the mass forces, are utilized in order to effect an adjustment of the engine component.
- forces acting on the engine component during operation of the internal combustion engine such as the gas pressure forces and the mass forces, are utilized in order to effect an adjustment of the engine component.
- the passive adjustment thus comes due to the use of these forces to an automatic adjustment of the engine component, while in the active adjustment from the outside, i. in addition to the aforementioned acting forces or independently of these even more adjusting forces are introduced.
- FIG. 2 is an associated plan view of the piston of FIG. 2,
- FIG. 6 shows schematically the development of a tumble flow in the intake phase
- FIG. 7 shows the arrangement of the nozzle openings on an injection nozzle
- FIG. 8 shows a modified arrangement of the nozzle opening
- a cylinder 1 of a reciprocating internal combustion engine is shown in a vertical section, the combustion chamber 2 is bounded by the cylinder head 3 on the one hand and the compression piston from the connecting rod 4.1 on the other.
- a circumferential recess / recess 11 is a circumferential Increase 15 at the edge of the piston absorbs.
- the angle between inlet valve 7 and outlet valve 9 may be up to 40 ° in one embodiment, wherein the bisector can be tilted by example, up to 8 ° relative to the Zyl indian axis 17.
- the in Fig. Section shown 1 is guided added, and namely in the region of Cyl inthe head 3 d urch the axis 6.1 of an inlet channel 6 and the zugeord ⁇ Neten outlet channel 8.
- the piston 4 is the section in a plane along the Cyl inderachse 17 out.
- the bottom 13 of the piston 4 is in the in Fig. 1 illustrated embodiment wesentl according to the shape of the cylinder head side boundary surface 5 is formed, d. H . So also ls roof-shaped, but with the peculiarity that - as shown in FIG. 1, I see that a two-part column 14 has been incorporated into the roof surface of the piston bottom 13. Mfangsrand respectively in T RANSITIONAL ⁇ area 12 of the roof contour of the piston head 13 to the U of the piston crown is provided with a circumferential elevation 15 13, whose shape is substantially complementary to the shape of the recess / depression 11 in the OB bergangs Symposium 10 of the cylinder roof to Zyl inthe wall.
- the shape and top 16 (cone-shaped, tapered or rounded, both inclined towards the manifold 14) of the elevation 15 is selected to be substantially independent of the compression ratio for guiding the edge flow in the combustion chamber 2 away from the cylinder wall and toward the cylinder wall Mouth to worry.
- a first injection device indicated here only in the injection axis 18.1 is indicated in the area of the cylinder axis 17, in the cylinder head 3, a first injection device indicated here only in the injection axis 18.1 is indicated.
- the first injection axis 18. 1 arranged offset by a small amount in the direction of the outlet channels 8, but it can also coincide with the cylinder axis 17.
- it can, for example, be inclined by up to 30 ° relative to the cylinder axis 17.
- a second injection device may be provided offset to the first preferably with a differently oriented, second injection axis 18.2.
- Fig. 1 the piston 4 is shown in its downward movement with the intake valves 7 open. Contrary to the combustion chamber configuration with valve angle> 0 ° and substantially at an angle a which opens into the combustion chamber 2 parallel inlet channels 6, it is assumed that a direction indicated by the two double arrows 19 swirl flow forms in the combustion chamber 2 from ⁇ , also in the compression phase, that is, largely maintained with closed intake valves 7 and with the upward movement of the piston 4.
- the injection nozzle has several, z. B.
- the swirling flow (see the double arrows 19), which is mainly produced by the Geo ⁇ geometry of the inlet ducts, is essentially determined by the Geo ⁇ geometry of the combustion chamber 2, in particular the design of the Dach vomberei- surface of the cylinder head-side boundary and the associated design of the piston crown 13 stabilized during the compression process, wherein the trough 14 in the piston head 13 in addition to their likewise stabilizing effect on the swirl ensures the desired long path lengths for the injected fuel quantities.
- the different end position of the piston 4 indicated in dashed lines in TDC, with a first position with highest compression than ⁇ and a second position with the lowest compression is designated as ⁇ 2.
- the difference ⁇ is a measure of the distance difference between the piston and the cylinder head with different compression in TDC.
- the dimension ⁇ can thus be found, for example, as a distance between a first and a second row of nozzle openings 22, 23 of the injection nozzle, as can be seen, for example, from FIG.
- the depression 14 in the piston bottom 13 is substantially rounded and has a base 20 with a circular edge.
- the angle of inclination b shown by way of example has the roof-shaped boundary both on the cylinder head side and on the side of the piston head
- the inlet channels 6 are in their area immediately before the curved transition to the closable by the inlet valve 7 inlet opening 7.1 with respect to their respective center axis 6.1 by preferably an angle a between 15 ° and 45 °, 2.479-
- FIG. Figure 4 illustrates a formed swirl flow at the end of a suction phase.
- the associated speed components CU (in the circumferential direction) and CA (axially) are indicated by arrows corresponding to FIG.
- Fig. 5 shows a trained Tumbleströmung for the same piston position. Again, the velocity components CT (tumble) and CA are indicated by arrows. In Fig. 5, it is indicated that the Anord voltage of the M still ulde 14 on the piston crown 13 during the subsequent upward movement of the piston 4 during the compression phase significantly to the up-right conservation of the tumble flow contributes, so that even with a compression stroke injection mode, a sufficient Strömungskom ⁇ component CT is present to support the mixture formation.
- FIG. 6 shows from left to right in individual steps how, in the intake phase, with the piston 4 moving downwards, the initially axially inflowing air is brought to a tumble flow in the further course of the intake phase, which is essentially determined by the geometric assignment of an inlet channels 6 to Zyl inderraum and also supported by the arrangement of a corresponding combustion chamber roof.
- the M uldengeometrie is indicated here by dashed lines.
- the Kol benrand has the increase 15, so that the edge flow at high as well as at low Sta lter Verdel Lter Verdichtung inwardly toward the well geometry is passed.
- Fig. 7 is the projecting into the combustion chamber 2 nozzle 21 of the fuels! n- spraying device shown schematically.
- the nozzle 21 has a plurality of nozzle openings 22 (eg, at least five).
- the nozzle openings are aligned with respect to the injection axis 18 so that the exiting fine fuel jets exit at an angle c of about 45 ° to 80 ° in the combustion chamber 2.
- the above-described and described combustion chamber design can be used in gasoline engines and for a diesel injection process with direct injection, in which the demand for high fuel pressures with low fuel consumption and low emissions is changed by changing the compression ratio and the adaptation For example Injektorlöcherauswah l or injector choice made light.
- the injector can be provided with nozzles of different design and arrangement of the nozzle opening.
- In addition to a so-called throttle nozzle with only one nozzle opening and nozzles with at least three nozzle openings are used.
- the angle c of the individual nozzle openings 22 with respect to the individual injection axes 18.1, 18.2 of the injection device and the angle d or the spacing of the individual nozzle openings 22 in the circumferential direction may each be different, as shown in FIGS.
- FIG. 7 and 9 is shown schematically for a nozzle with six nozzle openings 22.1 to 22.6. This is preferably adapted to different compression ratios, so that different nozzle openings are opened depending on the set compression ratio.
- the (second) nozzle of a two ⁇ th injector may have the same as other nozzle openings with different angles.
- the dimension ⁇ ' may deviate from the dimension ⁇ , with which rows of nozzle openings are arranged axially offset from one another.
- a second group of second nozzle openings 23 is arranged above a first group of first nozzle openings 22. While the first nozzle openings 22 are used at a low compression ratio, the second nozzle openings 23 are used at a higher compression ratio. This is also illustrated by the dimension ⁇ , which can be determined on the basis of the different densities.
- the invention can be described alternatively by one of said following feature groups, wherein the feature groups are combined with one another and individual features of one Merkmalsgrup ⁇ pe with one or more features of one or more other feature groups and / or one or more of the refinements described above, further gene are combinable.
- Hubkolbenverbrennungskraftmaschine according to the numbers 1 or 2, wherein the piston edge geometry has an at least approximately circumferential increase, which drops towards the inside to the trough mold.
- a reciprocating internal combustion engine wherein a distance between a point of the piston head with changed effective length of the connecting rod in a respective TDC and an actively injecting injection hole of the injector by changing a activation of different injection holes of the injector is at least approximately equal.
- Hubkolbenverbrennungskraftmaschine according to the numbers 4 or 5, wherein a point in the piston recess on which a center line of a spray jet of the injector geometrically aims in the TDC, at least approximately equal. 7.
- a reciprocating internal combustion engine with an adjustment of an effective connecting rod length for changing a compression ratio of a cylinder preferably according to one of the preceding figures, wherein the cylinder has a first and a second injector, each allow a different direction injection in response to a set effective fulcrum length
- a reciprocating internal combustion engine with an adjustment of an effective connecting rod length for changing a compression ratio of a cylinder preferably according to one of the preceding figures, wherein the injector is at least partially arranged such movable in the cylinder head that a position of one or more injection holes of the injector relative to the cylinder head is adjustable depending on an effective connecting rod length.
- a variable valve train is used in dependence on the compression ratio in the cylinder for generating a swirl in the combustion chamber.
- a swirl generator preferably a swirl flap
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE112015003456.0T DE112015003456A5 (de) | 2014-07-30 | 2015-07-28 | Brennkammergestaltung eines VCR-Motors |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014011091 | 2014-07-30 | ||
| DE102014011091.5 | 2014-07-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2016016229A2 true WO2016016229A2 (de) | 2016-02-04 |
| WO2016016229A3 WO2016016229A3 (de) | 2016-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2015/067251 Ceased WO2016016229A2 (de) | 2014-07-30 | 2015-07-28 | Brennkammergestaltung eines vcr-motors |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE112015003456A5 (de) |
| WO (1) | WO2016016229A2 (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017116244A1 (de) * | 2017-07-19 | 2019-01-24 | Volkswagen Aktiengesellschaft | Verbrennungsmotor und Verfahren zum Betreiben eines Verbrennungsmotors |
| US10378458B2 (en) | 2017-10-19 | 2019-08-13 | Ford Global Technologies, Llc | System and method for variable compression ratio engine |
| US10415493B2 (en) | 2017-10-19 | 2019-09-17 | Ford Global Technologies, Llc | System and method for variable compression ratio engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810412B (zh) * | 2022-05-20 | 2024-04-16 | 潍柴动力股份有限公司 | 一种活塞及气体发动机 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2223292B (en) * | 1988-09-29 | 1992-04-15 | T & N Technology Ltd | Improvements in and relating to pistons |
| JPH0610794A (ja) * | 1992-06-26 | 1994-01-18 | Kubota Corp | 直噴式ディーゼルエンジンの燃料噴射装置 |
| FR2891867B1 (fr) * | 2005-10-10 | 2012-04-20 | Peugeot Citroen Automobiles Sa | Moteur diesel a injection directe a rapport volumetrique de compression variable |
| DE102005055199B4 (de) * | 2005-11-19 | 2019-01-31 | FEV Europe GmbH | Hubkolbenverbrennungskraftmaschine mit einstellbar veränderbarem Verdichtungsverhältnis |
| JP2007263042A (ja) * | 2006-03-29 | 2007-10-11 | Toyota Motor Corp | 可変圧縮比内燃機関 |
| JP2008267267A (ja) * | 2007-04-20 | 2008-11-06 | Nissan Motor Co Ltd | 内燃機関 |
| JP2009036124A (ja) * | 2007-08-02 | 2009-02-19 | Nissan Motor Co Ltd | 筒内直接噴射式エンジン |
| JP5195491B2 (ja) * | 2009-02-16 | 2013-05-08 | 日産自動車株式会社 | 内燃機関の制御装置 |
| CN201874678U (zh) * | 2010-10-26 | 2011-06-22 | 曲峰 | 两冲程可变压缩比发动机 |
-
2015
- 2015-07-28 DE DE112015003456.0T patent/DE112015003456A5/de not_active Withdrawn
- 2015-07-28 WO PCT/EP2015/067251 patent/WO2016016229A2/de not_active Ceased
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017116244A1 (de) * | 2017-07-19 | 2019-01-24 | Volkswagen Aktiengesellschaft | Verbrennungsmotor und Verfahren zum Betreiben eines Verbrennungsmotors |
| CN109281756A (zh) * | 2017-07-19 | 2019-01-29 | 大众汽车有限公司 | 内燃机和运行内燃机的方法 |
| CN109281756B (zh) * | 2017-07-19 | 2021-03-30 | 大众汽车有限公司 | 内燃机和运行内燃机的方法 |
| US10378458B2 (en) | 2017-10-19 | 2019-08-13 | Ford Global Technologies, Llc | System and method for variable compression ratio engine |
| US10415493B2 (en) | 2017-10-19 | 2019-09-17 | Ford Global Technologies, Llc | System and method for variable compression ratio engine |
| US10914243B2 (en) | 2017-10-19 | 2021-02-09 | Ford Global Technologies, Llc | System and method for variable compression ratio engine |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016016229A3 (de) | 2016-05-06 |
| DE112015003456A5 (de) | 2017-08-03 |
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