EP0473736A1 - Device for injecting a fuel/gas mixture. - Google Patents
Device for injecting a fuel/gas mixture.Info
- Publication number
- EP0473736A1 EP0473736A1 EP91904484A EP91904484A EP0473736A1 EP 0473736 A1 EP0473736 A1 EP 0473736A1 EP 91904484 A EP91904484 A EP 91904484A EP 91904484 A EP91904484 A EP 91904484A EP 0473736 A1 EP0473736 A1 EP 0473736A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- distributor
- gas
- valve
- valve cap
- 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.)
- Granted
Links
Classifications
-
- 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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air
-
- 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
- F02M67/00—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type
-
- 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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/50—Arrangement of fuel distributors, e.g. with means for supplying equal portion of metered fuel to injectors
Definitions
- German patent application P 39 31490.1 has already proposed a device for injecting a fuel-gas mixture with a distributor housing, which has a gas supply opening which is concentric with a longitudinal axis of the valve, and has distributor openings which are aligned with spray openings of a fuel injector , the gas supply opening being connected to the distributor openings.
- the fuel jet is not sprayed from the spray openings directly, but rather as a free jet into the distributor openings, so that fuel edge mist and parts of the core jet hit the inner walls of the distributor housing.
- the gas in the distributor chamber formed by the distributor housing and the fuel injection valve has no significant directional effect on the fuel. Particularly when the fuel injection valve is inclined, there is a risk that the fuel wall film in the edge region of the gas flow will flow back upstream to the gas supply opening or reach another distributor opening. In the corners or edges the distribution chamber can deposit fuel, the z. B. after switching off the fuel injector leads to a troublesome dripping.
- the device according to the invention for injecting a fuel-gas mixture with the characterizing features of claim 1 in contrast, has the advantage of a particularly precise fuel allocation to the individual distributor openings or to the individual cylinders of an internal combustion engine and a largely homogeneous mixture formation.
- the directed fuel jet is injected from the spray openings of the spray end via the fuel transport channels into the distributor openings of the distributor housing and is transported completely downstream by the gas supplied via the gas gap, so that the formation of a fuel on the inner walls of the distributor housing is prevented.
- the gas gap at its narrowest point has a smaller cross-sectional area than the gas feed opening.
- the narrow formation of the gas gap allows the gas flow to be metered to the individual distributor openings, on the one hand, and on the other hand the gas is accelerated toward a high speed in the direction of the distributor openings, so that the mixture formation is improved and backward running of the fuel in the upstream direction is prevented.
- valve cap is provided with a number of truncated cone-shaped elevations corresponding to the number of distributor openings and directed towards one distributor opening, through which the fuel transport channels pass and through which protrude into the frustoconical recesses of the distributor housing at such a distance that the at least partially circumferential gas gaps are formed between the circumference of the elevations and the surface of the recesses.
- the gas supply opening is connected to the gas gaps by a gas distributor space which is formed concentrically with the longitudinal axis of the valve between the valve cap and the distributor housing, so that a particularly uniform supply of the gas to the gas gaps takes place.
- the smallest diameter of the elevation is smaller than the diameter of the distributor opening, so that the elevation advantageously projects into the distributor opening.
- a cone-shaped jacket of the elevation is step-shaped and rests with a first step on the depression of the distributor housing and with a second step together with a wall of the Depression forms the gas gap. This design enables a particularly precise and uniform formation of the gas gaps due to the numerous contact surfaces of the valve cap on the distributor housing.
- a gas channel running between the valve cap and the distributor housing is formed from the gas supply opening to each gas gap, so that an exact gas supply to the respective gas gap and a large contact surface of the valve cap running perpendicular to the valve axis on the ver ⁇ divider housing is made possible.
- the cone angle of the truncated cone-shaped elevation of the valve cap is smaller than the cone angle of the truncated cone-shaped recess of the distributor housing, so that the gas accelerates continuously until it enters an area of the distributor opening facing the spray opening of the fuel injection valve formed mixture formation zone experiences.
- the assembly of the valve cap in the distributor housing is facilitated.
- the shape and position tolerances of the elevations and the depressions can be designed more generously, with the exception of the immediate area of the distributor openings.
- the fuel transport channel is formed in a fuel tube that leads through the valve cap.
- This enables a valve cap which can be produced in a simple manner, since there is no need for fine machining of the fuel transport ducts and instead pipe material which can be cut to length is used.
- the fuel tube protrudes into the recess of the distributor housing and if the at least partially circumferential gas gap is formed between the surface of the recess and the circumference of the fuel tube. As a result, the valve cap can be produced in a particularly simple manner and on its circumference with large manufacturing tolerances.
- the outer diameter of the fuel tube is smaller than the diameter of the distributor opening, so that the fuel tube advantageously projects into the distributor opening.
- valve cap For an exact and concentric contact of the fuel injection valve with the valve cap, it is advantageous if the truncated cone-shaped spray end of the valve housing rests on a truncated cone-shaped contact surface of the valve cap.
- valve cap rests with a collar on a shoulder of the distributor housing.
- valve housing to the valve cap is achieved by a positive connection in the circumferential direction between the valve cap and the valve housing is determined.
- the position from the valve cap to the distributor housing is determined by a connection between the valve cap and the distributor housing that is positive in the circumferential direction that prevents the valve cap from rotating relative to the distributor housing and thus ensures that the fuel transport channels are aligned with the distributor openings of the distributor housing.
- FIG. 1 shows a first exemplary embodiment with a partially illustrated fuel injector
- FIG. 2 shows a view of the valve cap in the direction of arrow X of the first exemplary embodiment
- FIG. 3 shows a second exemplary embodiment with a partially illustrated fuel injector
- FIG. 4 shows a view of the distributor housing in the direction of the Arrow Y of the second embodiment
- FIG. 5 a third and FIG. 6 a fourth embodiment.
- the device for injecting a fuel-gas mixture into an intake manifold or directly into the cylinders of an internal combustion engine for example, shown in longitudinal section and in detail in FIG of a valve housing 4 rests on a truncated cone-shaped contact surface 6 of a valve cap 7, so that there is a simple, but nevertheless very exact centering of the fuel injection valve 1 with respect to the valve cap 7.
- the valve cap 7 is at least in the axial direction between the spray end 3 of the fuel injection valve 1 and a distributor housing 10 which, with a stepped longitudinal bore 11, engages around the spray end 3, the valve cap 7 and at least partially the fuel injection valve 1 , arranged.
- the fuel injector 1 has a valve closing body 14 which interacts with a fixed valve seat 12 and can be actuated as a function of the operating state. Downstream of the valve seat 12, the spray end 3 of the fuel injection valve 1 has, for example, four, the number of cylinders of the internal combustion engine or the number of injection groups in which several cylinders of the internal combustion engine are combined, corresponding number of spray openings 15. Aligned with the spray openings 15 are in the valve cap 7 has a number of fuel transport channels 17 which are open on both sides and correspond to the number of spray openings 15 and which each open into a distributor opening 19 arranged in the distributor housing 10 and concentrically with the spray openings 15. Starting from the distributor openings 19, distributor lines 18 run in alignment with the fuel transport channels 17 in the distributor housing 10.
- a gas supply opening 20 extends concentrically to the longitudinal axis 2 of the valve in the distributor housing 10, which is adjoined in the axial direction by a gas distributor chamber 22 formed between the valve cap 7 and the distributor housing 10 in a recess 21 of the distributor housing 10.
- the gas distribution space 22 establishes a section of the connection between the central gas supply opening 20 and the individual distribution openings 19.
- Cross-sectional area of the fuel transport channel 17 is at least as large as the cross-sectional area of the spray opening 15 and the cross-sectional area of the distributor opening 19 is at least as large as the cross-sectional area of the fuel transport channel 17.
- a compensating bore 23 is formed in the valve cap 7 which has a cross-sectional area which is substantially smaller in comparison with the gas supply opening 20.
- the compensating bore 23 connects the gas distribution chamber 22 to a compensating chamber 27 formed between an end face 24 of the injection end 3 of the fuel injector 1 and the valve cap 7.
- a compensating chamber 27 formed between an end face 24 of the injection end 3 of the fuel injector 1 and the valve cap 7.
- the valve cap 7 is provided with a number of truncated cone-shaped elevations 25, which correspond to the number of distributor openings 19 and are directed toward one distributor opening 19, through which the fuel transport channels 17 run concentrically.
- the elevations 25 with their frustoconical shell 29 protrude into the frustoconical recesses 26 of the distributor housing 10 at such a distance that a circumferential narrow gas gap 28 is formed between the circumference of the elevations 25 and the surface of the recesses 26, so that the fuel jet after exiting the fuel transport channel 17 is completely covered by a gas jet.
- Each gas gap 28 extends from the gas distributor space 22 to one of the distributor openings 19 forming the base of a depression 26.
- the elevations 25 with the fuel transport channels 17 can end immediately above, at the same level as this or within the distributor openings 19, as shown in the drawing.
- FIG. 2 shows a view of the valve cap 7 of the first exemplary embodiment shown in FIG. 1 in the direction of the arrow X.
- the cylindrical gas distributor chamber 22 stands with the narrow gas gaps 28 tapering in the shape of a truncated cone toward the distributor openings 19, each via an Transition formed throttle point 31 in connection, which due to the large reduction in cross-section result in an exact metering of the gas supplied to the distributor openings 19 via the gas gaps 28 and an acceleration of the gas.
- the cross-sectional area of the gas gap 28 that tapers in the shape of a truncated cone leads to a further acceleration of the gas, so that the gas comprises the fuel emerging from the fuel transport channel 17 at high speed.
- the fuel sprayed from the spray openings 15 is transported completely downstream and cannot pass through the gas gaps 28 upstream into the gas distribution chamber 22 and into the gas supply opening 20 or reach the distributor openings 19 of the other cylinders or the other injection groups of the internal combustion engine.
- the fuel / gas mixture is sprayed into the intake manifold or directly into the cylinders of the internal combustion engine via the distribution lines 18 and injection lines (not shown).
- the gas is, for example, air branched off by a bypass in front of a throttle valve in the intake manifold of the internal combustion engine.
- valve cap 7 has a collar 35 which, with its collar surface 36 running perpendicular to the longitudinal axis 2 of the valve, on a shoulder surface 37 of a shoulder 38 of the distributor housing 10 is present. The circumference of the collar 35 lies against a parallel section 39 of the longitudinal bore 11 of the distributor housing 10 facing away from the gas supply opening 20.
- the position of the fuel injector 1 relative to the valve cap 7 is determined by a positive connection in the circumferential direction between the valve housing 4 of the fuel injector 1 and the valve cap 7.
- a positioning lug 42 is formed, for example, on a longitudinal bore 41 that runs concentrically to the valve longitudinal axis 2 in the valve cap 7 and which cooperates with a positioning recess 43 formed on the circumference of the valve housing 4. This prevents the fuel injection valve 1 from rotating with respect to the valve cap 7 and thus at the same time aligns the spray openings 15 of the splashing 3 with the fuel transport channels 17 of the valve cap 7 ensured.
- valve cap 7 In order to ensure alignment of the fuel transport channels 17 of the valve cap 7 with the distributor openings 19 of the distributor housing 10, the valve cap 7 must be prevented from rotating relative to the distributor housing 10.
- the position in the circumferential direction between the valve cap 7 and the distributor housing 10 which determines the position of the valve cap 7 relative to the distributor housing 10 is, for example, a positioning lug 45 formed on the parallel section 39 of the distributor housing 10 and a cooperation on the circumference of the collar 35 with this the valve cap 7 formed positioning recess 46.
- annular chamber 50 is provided, the radially extending boundary surfaces of which are formed by an end face 51 of the collar 35 of the valve cap 7 facing away from the fuel transport channels 17 and perpendicular to the longitudinal axis 2 of the valve, and by a retaining ring 52 fastened to the circumference of the valve housing 4 and axially extending boundary surfaces are formed by the circumference of the valve housing 4 and by the parallel section 39 of the distributor housing 10.
- a sealing ring 53 is arranged in the annular chamber 50.
- FIG. 3 shows a second exemplary embodiment of the invention with a partially illustrated fuel injection valve 1, in which the same and equivalent parts are identified by essentially the same reference numerals as in FIGS. 1 and 2.
- the frustoconical one Sheath 29 of the elevation 25 is stepped.
- the elevation 25 lies with a first step 61 on a wall 65 of the recess 26 of the distributor housing 10, so that a particularly exact and uniform formation of the gas gaps 28 is possible and thus, for example, a largely identical mixture is supplied to the individual cylinders of the internal combustion engine.
- a recessed second stage 64 of the elevation 25 forms, together with the wall 65 of the recess 26, the gas gap 28.
- FIG. 4 which shows a view of the distributor housing 10 of the second exemplary embodiment in the direction of the arrow Y, runs between the central one Gas supply opening 20 and the individual gas gaps 28 each have a gas channel 67 in the radial direction, which, between the valve cap 7 and the distributor housing 10, for example in the form of a groove 70 formed in a bottom surface 68 of the distributor housing 10 and delimited by the elevation 25 is trained.
- the gas channel 67 can be a rectangular as well as another, e.g. B. have semicircular cross-sectional shape. However, it is necessary that the cross section of the gas channel 67 is significantly smaller than the cross section of the gas supply opening 20, so that when the gas flows from the gas supply opening 20 into the gas channels 67, a restriction takes place, which means that the individual distribution openings 19 are measured effected via the gas column 28 supplied gas and an acceleration of the gas.
- the gas gaps 28 tapering in the shape of a truncated cone in the direction of the distributor openings 19 lead to a further acceleration of the gas, so that the gas comprises the fuel emerging from the fuel transport channels 17 at high speed.
- FIG. 5 A third exemplary embodiment according to the invention is partially shown in FIG. 5, with the same parts having the same effect essentially the same reference numerals are identified as in FIGS. 1 to 4.
- the circumferential gas gap 28 is formed between the circumference of the truncated cone-shaped elevation 25 and the surface of the truncated cone-shaped depression 26. Since the cone angle of the elevation 25 is smaller than the cone angle of the depression 26, the circumference of the elevation 25 and the surface of the depression 26 are designed to converge in the direction of the distributor opening 19. Accordingly, the gas gap 28 tapers very strongly starting from the central gas distributor space 22 to the distributor opening 19, so that there is a large, continuous reduction in the cross section of the gas gap 28.
- the throttling of the gas flow resulting from this leads on the one hand to a metering of the gas supplied to the individual distributor openings 19, on the other hand the gas is continuously accelerated and comprises the fuel emerging from the fuel transport channel 17 at high speed.
- the shape and position tolerances of the elevations 25 and the depressions 26 can be designed more generously, with the exception of in the immediate area of the distributor openings 19.
- the assembly of the valve cap 7 in the distributor housing 10 is facilitated.
- FIG. 6 In a fourth exemplary embodiment partially shown in FIG. 6, the same and equivalent parts are identified by essentially the same reference numerals as in FIGS. 1 to 5.
- the fuel is sprayed out of the spray openings 15 and reaches the distributor openings 19 via the fuel transport channels 17
- the fuel transport channels 17 are each formed by a fuel tube 75 which leads through the valve cap 7.
- the fuel tubes 75 are made, for example, of pipe material that can be cut to length, so that they can be produced inexpensively.
- valve cap 7 A simple and inexpensive manufacture of the valve cap 7 is also achieved in that the fuel tube 75 protrudes into the recess 26 of the distributor housing 10, and that the circumferential Gas gap 28 is formed between the frustoconical surface of the recess 26 and the circumference of the fuel tube 75, so that the requirements for the surface quality of the valve cap 7 are low, at least in the region of the elevations 25 at least partially surrounding the fuel tube 75.
- the essential throttling of the gas takes place when the gas flows through the funnel-shaped gas gap 28, so that the metering and acceleration of the gas also take place there.
- the fuel tubes 75 protrude into the distributor openings 19 of the distributor housing 10, provided that the outer diameter of the fuel tubes 75 is smaller than the diameter of the distributor openings 19, so that no fuel from the fuel transport channels 17 into the further upstream ordered gas column 28 can reach.
- the fuel tube 75 and the valve cap 7 are formed in one piece.
- the fuel is injected in a directed manner via the fuel transport channels 17 into the distributor openings 19.
- the gas passes from a central gas supply opening 20 via a gas gap 28 to each of the Distribution openings 19 and there comprises the fuel at high speed, so that the fuel is transported completely downstream and a largely homogeneous fuel-gas mixture is formed.
Abstract
Dans le cas des dispositifs déjà proposés pour l'injection d'un mélange de carburant-gaz, le jet de carburant est projeté depuis les orifices d'injection d'un injecteur de carburant sous forme de jet libre dans les orifices de distribution d'un boîtier de distribution de sorte qu'il y a un risque que des brouillards de carburant marginaux et des fractions du jet central ne donnent contre les parois intérieures du boîtier de distribution. La constitution d'un mélange carburant-gaz largement homogène n'est pas garantie. Le nouveau dispositif avec les jets de carburant projetés de manière dirigée depuis les orifices d'injection (15) via les conduites de carburant (17) jusque dans les orifices de distribution (19) présente l'avantage d'un dosage précis du carburant vers les différents orifices de distribution (19) et d'une formation de mélange largement homogène. Le gaz parvient, à partir d'un orifice d'amenée de gaz central (20) à travers une chambre de distribution de gaz (22) et à travers chaque fois une fente à gaz (28), à un orifice de distribution correspondant (19) où il entoure le jet de carburant respectif. Le présent dispositif convient en particulier à des moteurs à combustion interne faisant appel à un système d'allumage extérieur.In the case of the devices already proposed for the injection of a fuel-gas mixture, the fuel jet is projected from the injection orifices of a fuel injector in the form of a free jet in the distribution orifices of a distribution box so that there is a risk that marginal fuel mists and fractions of the central jet will strike against the inner walls of the distribution box. The constitution of a largely homogeneous fuel-gas mixture is not guaranteed. The new device with the fuel jets projected in a directed manner from the injection ports (15) via the fuel lines (17) to the distribution ports (19) has the advantage of a precise metering of the fuel to the various distribution orifices (19) and a largely homogeneous mixture formation. The gas arrives, from a central gas supply orifice (20) through a gas distribution chamber (22) and each time through a gas slot (28), to a corresponding distribution orifice ( 19) where it surrounds the respective fuel jet. The present device is suitable in particular for internal combustion engines using an external ignition system.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4009320A DE4009320A1 (en) | 1990-03-23 | 1990-03-23 | Device for injecting mixt. of fuel and gas |
DE4009320 | 1990-03-23 | ||
PCT/DE1991/000151 WO1991014865A1 (en) | 1990-03-23 | 1991-02-23 | Device for injecting a fuel/gas mixture |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0473736A1 true EP0473736A1 (en) | 1992-03-11 |
EP0473736B1 EP0473736B1 (en) | 1995-07-05 |
Family
ID=6402874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91904484A Expired - Lifetime EP0473736B1 (en) | 1990-03-23 | 1991-02-23 | Device for injecting a fuel/gas mixture |
Country Status (5)
Country | Link |
---|---|
US (1) | US5203308A (en) |
EP (1) | EP0473736B1 (en) |
JP (1) | JPH04505795A (en) |
DE (2) | DE4009320A1 (en) |
WO (1) | WO1991014865A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5170766A (en) * | 1992-01-16 | 1992-12-15 | Orbital Walbro Corporation | Fuel and air injection for multi-cylinder internal combustion engines |
IN186569B (en) * | 1992-05-15 | 2001-10-06 | Orbital Eng Pty | |
FR2722541B1 (en) * | 1994-07-12 | 1996-09-20 | Magneti Marelli France Sa | "BI-JET" FUEL INJECTOR WITH PNEUMATIC SPRAY ASSISTANCE, FOR INTERNAL COMBUSTION ENGINE SUPPLIED BY INJECTION |
DE19529375A1 (en) * | 1995-08-10 | 1997-02-13 | Bosch Gmbh Robert | Fuel injector |
US6427660B1 (en) * | 2000-07-20 | 2002-08-06 | Ford Global Technologies, Inc. | Dual fuel compression ignition engine |
US8360052B2 (en) * | 2008-09-30 | 2013-01-29 | Martin E Nix | Half parabolic dish reflector with planar reflector solar smelter |
JP6902280B2 (en) * | 2015-10-16 | 2021-07-14 | ノストラム エナジー ピーティーイー.リミテッドNostrum Energy Pte.Ltd. | How to change the conventional direct injection device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4570598A (en) * | 1985-04-15 | 1986-02-18 | Ford Motor Company | Air assist fuel distributor type fuel injection system |
US4709681A (en) * | 1986-03-04 | 1987-12-01 | Volkswagen Ag | Fuel injection device |
DE3708776A1 (en) * | 1986-03-29 | 1987-10-01 | Volkswagen Ag | Fuel injection device |
US4708117A (en) * | 1986-04-14 | 1987-11-24 | Colt Industries Inc. | Multi-point fuel injection apparatus |
DE3816332A1 (en) * | 1987-05-23 | 1988-12-15 | Volkswagen Ag | Fuel injection device |
US4909220A (en) * | 1987-08-03 | 1990-03-20 | General Motors Corporation | Fuel injection |
-
1990
- 1990-03-23 DE DE4009320A patent/DE4009320A1/en not_active Withdrawn
-
1991
- 1991-02-23 DE DE59105916T patent/DE59105916D1/en not_active Expired - Fee Related
- 1991-02-23 EP EP91904484A patent/EP0473736B1/en not_active Expired - Lifetime
- 1991-02-23 WO PCT/DE1991/000151 patent/WO1991014865A1/en active IP Right Grant
- 1991-02-23 JP JP3504753A patent/JPH04505795A/en active Pending
- 1991-02-23 US US07/775,982 patent/US5203308A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9114865A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5203308A (en) | 1993-04-20 |
EP0473736B1 (en) | 1995-07-05 |
DE4009320A1 (en) | 1991-09-26 |
JPH04505795A (en) | 1992-10-08 |
WO1991014865A1 (en) | 1991-10-03 |
DE59105916D1 (en) | 1995-08-10 |
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