EP0493390A1 - Vorrichtung zur einspritzung eines kraftstoff-luft-gemisches für mehrzylindrige brennkraftmaschinen. - Google Patents
Vorrichtung zur einspritzung eines kraftstoff-luft-gemisches für mehrzylindrige brennkraftmaschinen.Info
- Publication number
- EP0493390A1 EP0493390A1 EP90911534A EP90911534A EP0493390A1 EP 0493390 A1 EP0493390 A1 EP 0493390A1 EP 90911534 A EP90911534 A EP 90911534A EP 90911534 A EP90911534 A EP 90911534A EP 0493390 A1 EP0493390 A1 EP 0493390A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- fuel
- bore
- chamber
- section
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
- F02M51/0675—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
- F02M51/0678—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
-
- 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
- the invention is based on a device for 5 injection of a fuel-air mixture for multi-cylinder internal combustion engines as defined in the preamble of claim 1.
- Fuel but a mixture of fuel and a supporting air stream branched off from the intake line of the internal combustion engine.
- the air-fuel mixture is based on the individual
- Injection points of the individual cylinders of the internal combustion engine can do that each cylinder of the internal combustion engine leading suction pipe cer intake line or the inlet valve of the cylinder.
- the mixing of the fuel before the actual injection into the cylinder causes on the one hand an external treatment of the fuel and thus a cheaper one
- Combustion in the internal combustion engine offers the possibility of supplying a plurality of cylinders to the internal combustion engine with precise metering with a single fuel injection valve.
- valve member is formed on a sleeve which is guided axially displaceably on a shaft and is connected to the electromagnet.
- the end of the shaft has a flange which rests on the distributor and coaxial to the distributor bores
- Fuel metering bores which are closed on the upper side of the flange facing away from the distributor by the valve member pressed onto the flange by a valve closing valve. Seen in the fuel flow direction in front of the flange is a valve chamber receiving the valve closing spring, which is connected on the one hand via a hollow cylindrical ring channel coaxial to the shaft between the sleeve and the electromagnet with the fuel inlet and on the other hand via a pressure control valve with a fuel return.
- the device according to the invention with the characterizing features of claim 1 has the advantage, with a very simple construction, of fulfilling the requirement for an extremely small spread of the quantity of fuel metered into the individual distributor holes. Due to the position ces fuel entry into the valve chamber between Ventilsi z and valve needle guide, a uniform flow of the individual fuel metering bores, which is undisturbed by the movement of the valve needle, is achieved, which in turn means that the quantity of fuel jets flowing out via the individual distributor bores differs very little.
- the device according to the invention also has the advantage that a side-feed valve known per se, as is used for in-line injection pumps per cylinder of the internal combustion engine, has only a slight design. can be used in changes as a fuel injector.
- a side feed valve is described for example in DE 37 05 848 AI.
- the design changes consist in the laying of at least one connecting hole leading to the valve chamber and in the -5 design of the distributor chamber with the
- valve needle with guide section and the valve comb are dimensioned such that the clear ring cross section remaining between the valve needle and the inner wall of the valve chamber
- valve chamber is 40 - 80 times larger than the ring-shaped seat cross-section.
- at least one connection hole is dimensioned such that the clear ring cross section between the valve needle and the inner wall of the valve chamber is 10-20 times larger than the cross section of the
- valve needle is provided with a second guide section which is formed on the free end of the valve needle facing away from the first guide section, beyond the valve seat.
- the second guide section lies in a guide bore which adjoins the distributor chamber coaxially. Through this second guide section is without
- the valve needle is smooth-running and enables high switching speeds.
- the guide bore is designed as a through bore, the play between the through bore and the guide section of the valve needle lying in it must be tolerated very closely, since otherwise fuel will pass through the guide gap into the air supply during long injection pulses due to the system pressure present.
- the guide bore is as
- Fig. 1 a section of a longitudinal section
- Fig. 2 each section of a longitudinal section cer and 3 injection device according to a second unccritten embodiment.
- the device shown in Fig. 1 in longitudinal section and detail for the injection of a fuel-air mixture for a multi-cylinder internal combustion engine has a Kraf fuel injection valve 12, which is used in a receiving chamber 11 of a valve carrier 10poundickeitscic.it.
- the receiving chamber 11 is connected to a fuel inlet 13 and to a fuel inlet 14.
- the fuel flow ric. direction is marked by your arrows.
- the injection device also includes an on the output side of the
- Fuel injection valve 12 attached distributor 15, which has an air supply 16 and a plurality of connection openings 17 connected to the air supply 16.
- the number of distributor holes 17 corresponds to. t the number of cylinders of the internal combustion engine.
- An injection line 13 leads from each of the distribution bores 17 to each cylinder of an internal combustion engine, which opens into the intake pipe of the cylinder.
- the fuel injection valve 12 has a three-part valve housing 20 with a cup-shaped upper part 21, a middle part 22 and a neck-like lower part 23.
- the middle part 22 is inserted into the upper part 21 and the lower part 23 into the middle part 22 and each fastened by flanging.
- the upper part 21 is sealed with a sealing ring 24 and the lower part 23 with a sealing ring 25 with respect to the inner wall of the receiving chamber 11.
- the receiving chamber 11 0 enclosed between these sealing rings 24, 25 is filled with fuel, so that the valve housing 20 is flushed with fuel.
- a stepped bore 26, which is closed on the end side, is made in the nozzle-like lower part 23, in which a valve seat 27 is formed at the transition between two bore sections.
- the valve seat 27 cooperating with an o valve member 28 divides the stepped bore 26 into an upstream valve chamber 29 and into a downstream distribution chamber 30.
- fuel metering bores 31 penetrating the wall of the lower part 23.
- the free end of the lower part 23 projects into a recess 19 into the distributor 15 into which both the air supply 16 and the distributor bores 17 open.
- the arrangement of the fuel metering bores 31 is such that they are aligned essentially coaxially with an associated distributor bore 17.
- valve member 28 is formed on a valve needle 32, which is guided axially displaceably in the valve chamber 29 by means of two larger-diameter guide sections 33, 34.
- the valve chamber 29 is above radial bores 35, of which
- Fig. 1 Two can be seen in Fig. 1, in connection with the fuel-filled receiving chamber 11.
- the Radialbohrunge.i 35 are introduced so that they open in the valve chamber 29 in the region between the valve seat 27 and the guide section 33 closest to the valve seat 27.
- the Radial bores 35 are dimensioned such that the clear ring cross section of the valve chamber 29, which remains between the valve needle 32 and the inner wall of the stepped bore 26, is approximately 10-20 times larger than the sum of the
- Valve needle 32 with its guide sections 33, 34 and the valve chamber 29 in the region between the valve seat 27 and the guide section 33 facing them so that the valve needle 29 and the inner wall of the
- Valve seat 27 The latter is preferably chosen to be approximately 0.3 mm ⁇ . As a result of this measurement, the valve chamber 29 is located between the valve seat 27 and the latter
- valve needle path causes no additional disturbances in the compensation volume when the fuel injector is opened, so that the uniform flow against the fuel metering bores 31st
- the Ventilna ⁇ el 32 is actuated by an electromagnet 36 housed in the upper part 21 of the valve housing 20.
- the magnet pot of the electromagnet 36 is formed by the upper housing part 21, which is in one piece a coaxial
- Topfooöen continues outside like a neck.
- a coil carrier 38 is seated on the magnetic core 37, on which an excitation coil 39 is wound.
- JD working air gap 40 opposite magnet armature 41 is guided axially displaceably in a bore 42 in the middle part 22 of the housing.
- the end of the valve needle 32 provided with a flange 44 is firmly connected to the hollow cylindrical magnet armature 41.
- a valve closing spring 45 arranged inside the magnetic core 37 and the magnet armature 41 is supported on the one hand on the flange 44 of the valve needle 32 and on the other hand on an adjustable stop 46 which is screwed into the magnetic core 37.
- the valve chamber 29 is connected to the inside of the magnetic core 37 via a bore 47 in the flange 43 and the valve core 29 is connected to the receiving chamber 11 via bores 48.
- the electromagnet 36 is a plug 50 with two contact pins 51 leading to the excitation coil 39, 52 controllable, whereby it raises the valve needle 32 against the force of the valve closing spring 45, so that the valve member 28 is lifted from the valve seat 27 for the duration of the magnet reg.
- the fuel in the valve chamber 29 is under pressure via the
- Fuel metering bores 31 are injected into the distributor bores 17 and mixes here "with the support air stream supplied via the air supply 16 (arrow 53), which is divided equally over the recess 19 into the individual distributor bores 17".
- Valve needle 32 modified.
- the second guide section 34 of the valve needle 32 is taken out of the valve chamber 29 and laid beyond the valve seat 27 and is designed as a guide section 34 'at the free end of the valve needle 32.
- a through hole 54 is introduced into the sack-like bottom of the stepped bore 2 ′ 6, which connects the valve chamber 29 to the recess 19 in the distributor 15.
- the guide section 34 ' is guided in an axially displaceable manner with very closely tolerated play.
- the first guide section 33 'remaining in the valve chamber 29, which is close to the valve seat 27, is laid on the valve needle 32 further in the direction of the electromagnet 36 compared to the embodiment of FIG. 1, so that there is a relatively large aostand between the two guide sections 33' and 34 '. This large distance prevents the valve needle 32 from tipping over, so that it cannot tilt and is very easy to move and thus enables short switching times of the valve.
- the injection device shown in the exemplary embodiment differs from that in FIG. 2 only with regard to the design of the guide bore for the guide cut 34 ′ at the end of the valve needle 32 'on the valve needle 32 with play.
- the guide section 34 ' carries on its surface a longitudinally continuous axial vent groove 56. '
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3931490 | 1989-09-21 | ||
DE3931490A DE3931490A1 (de) | 1989-09-21 | 1989-09-21 | Vorrichtung zur einspritzung eines kraftstoff-luft-gemisches fuer mehrzylindrige brennkraftmaschinen |
PCT/DE1990/000626 WO1991004408A1 (de) | 1989-09-21 | 1990-08-14 | Vorrichtung zur einspritzung eines kraftstoff-luft-gemisches für mehrzylindrige brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0493390A1 true EP0493390A1 (de) | 1992-07-08 |
EP0493390B1 EP0493390B1 (de) | 1994-04-20 |
Family
ID=6389872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90911534A Expired - Lifetime EP0493390B1 (de) | 1989-09-21 | 1990-08-14 | Vorrichtung zur einspritzung eines kraftstoff-luft-gemisches für mehrzylindrige brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
US (1) | US5269281A (de) |
EP (1) | EP0493390B1 (de) |
JP (1) | JPH05503752A (de) |
DE (2) | DE3931490A1 (de) |
WO (1) | WO1991004408A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3085008B2 (ja) * | 1993-03-12 | 2000-09-04 | 株式会社デンソー | 流体噴射弁 |
FR2722541B1 (fr) * | 1994-07-12 | 1996-09-20 | Magneti Marelli France Sa | Injecteur de carburant "bi-jet" a aassistance pneumatique de pulverisation, pour moteur a combustioninterne alimente par injection |
US5463997A (en) * | 1994-10-05 | 1995-11-07 | Cutler Induction Systems, Inc. | Single point fuel injection system |
DE19547406B4 (de) * | 1995-12-19 | 2007-10-31 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
US6959699B2 (en) * | 2003-11-03 | 2005-11-01 | Caterpillar Inc | Injection of fuel vapor and air mixture into an engine cylinder |
CA2798870C (en) * | 2012-12-17 | 2014-07-22 | Westport Power Inc. | Air-enriched gaseous fuel direct injection for an internal combustion engine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0163198B1 (de) * | 1984-05-29 | 1987-11-11 | Volkswagen Aktiengesellschaft | Verfahren zur kontinuierlichen Kraftstoffeinspritzung und Einrichtung zur Durchführung des Verfahrens |
US4709681A (en) * | 1986-03-04 | 1987-12-01 | Volkswagen Ag | Fuel injection device |
US4708117A (en) * | 1986-04-14 | 1987-11-24 | Colt Industries Inc. | Multi-point fuel injection apparatus |
US4840163A (en) * | 1987-01-08 | 1989-06-20 | Colt Industries Inc. | Electromagnet, valve assembly and fuel metering apparatus |
DE3705848C2 (de) * | 1987-02-24 | 1994-01-20 | Bosch Gmbh Robert | Hydraulischer Kreislauf einer Kraftstoffeinspritzanlage |
US4794901A (en) * | 1987-06-16 | 1989-01-03 | Industrial Technology Research Institute | Low pressure air assisted fuel injection apparatus for engine |
-
1989
- 1989-09-21 DE DE3931490A patent/DE3931490A1/de not_active Withdrawn
-
1990
- 1990-08-14 US US07/842,210 patent/US5269281A/en not_active Expired - Fee Related
- 1990-08-14 EP EP90911534A patent/EP0493390B1/de not_active Expired - Lifetime
- 1990-08-14 WO PCT/DE1990/000626 patent/WO1991004408A1/de active IP Right Grant
- 1990-08-14 JP JP2510809A patent/JPH05503752A/ja active Pending
- 1990-08-14 DE DE59005475T patent/DE59005475D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9104408A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE59005475D1 (de) | 1994-05-26 |
EP0493390B1 (de) | 1994-04-20 |
WO1991004408A1 (de) | 1991-04-04 |
JPH05503752A (ja) | 1993-06-17 |
US5269281A (en) | 1993-12-14 |
DE3931490A1 (de) | 1991-04-04 |
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