EP0323368B1 - Vorrichtung zur pneumatischen Kraftstoffeinspritzung - Google Patents
Vorrichtung zur pneumatischen Kraftstoffeinspritzung Download PDFInfo
- Publication number
- EP0323368B1 EP0323368B1 EP88403381A EP88403381A EP0323368B1 EP 0323368 B1 EP0323368 B1 EP 0323368B1 EP 88403381 A EP88403381 A EP 88403381A EP 88403381 A EP88403381 A EP 88403381A EP 0323368 B1 EP0323368 B1 EP 0323368B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- valve
- injector
- chamber
- pneumatic
- 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.)
- Expired - Lifetime
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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
- 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
- F02M67/02—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 the gas being compressed air, e.g. compressed in pumps
- F02M67/04—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 the gas being compressed air, e.g. compressed in pumps the air being extracted from working cylinders of the engine
Definitions
- the invention relates to a pneumatic fuel injection device in a cylinder of a reciprocating internal combustion engine.
- the introduction of fuel in spray form into the cylinder can be carried out by a pneumatic injection device comprising an injector opening into the cylinder provided with a valve controlled by a cam for its opening and closing, a supply means for the liquid fuel injector and a source of compressed air ensuring the atomization and injection of the fuel when the injector is opened.
- the sweeping of the cylinder by fresh air is carried out by means of a pump casing communicating with the cylinder at its lower part so that the piston moving in the cylinder produces a compression of the air of the casing by moving towards its point dead low.
- Ducts joining the pump casing to the cylinder intake lights ensure the transfer of compressed air to the cylinder, this compressed air entering the cylinder, which it scans when the intake lights are discovered by the piston during its movement towards its bottom dead center.
- the pump housing can be connected to the injector by a conduit on which a valve is disposed.
- the part of the duct located downstream of the valve can in itself constitute a compressed air capacity or be connected to such a capacity.
- Such a device which makes it possible to avoid the use of an additional source of compressed gas however requires the provision of a conduit junction between the pump casing and the injector and possibly a capacity in communication with this conduit.
- a source of auxiliary compressed air has always been used hitherto, or a connecting duct between the pump casing and the cylinder and possibly a compressed air storage capacity.
- the invention relates to a device for pneumatically injecting fuel into a cylinder of an engine, using gases taken from this cylinder, according to claim 1.
- Figure 1 is a partial view in elevation and in section of a cylinder of an engine comprising of the pneumatic injection device according to an embodiment allowing the implementation of the invention.
- Figure 2 is a view similar to Figure 1 showing the engine cylinder at a different time from the operating cycle.
- FIG. 3 is an operating diagram of the engine, the cylinder of which is shown in FIGS. 1 and 2.
- Figure 4 is a schematic sectional view in elevation of a cylinder of an engine comprising an injection device according to another embodiment, allowing the implementation of the invention.
- the pneumatic injector 32 opening into the upper part of the cylinder 30 comprises a valve 33 controlled by a cam 34, a means for supplying liquid fuel not shown and a device 35 supplying the pneumatic injector 32 with a gas under pressure allowing the spraying and injecting liquid fuel.
- the device 35 comprises a conduit 36 communicating, at one of its ends, with the cylinder chamber 30 by a light 37 arranged above the exhaust and transfer ports of the cylinder not shown and at its other end, with the pneumatic injector chamber 32 at the top of the cylinder.
- a valve 38 is disposed on the pipe 36 and delimits on this pipe an upstream part communicating with the cylinder 30 and a downstream part communicating with the injector 32. The valve 38 opens when the differential pressure between the upstream and the downstream in a conduit 36 exceeds a certain value corresponding to the tare weight of the valve 38.
- the downstream part of the conduit 36 is capable of constituting by itself a capacity of pressurized gas in communication with the valve chamber 32. This downstream part of the conduit 36 can also be put in communication with a capacity allowing the storage of gas under pressure.
- the piston 30a moves upwards inside the cylinder 30 and realizes the compression of a fuel mixture located in the upper part of the cylinder.
- the piston 30a masks the lumen 37 and the valve 38 which is subjected to slightly different upstream and downstream pressures remains closed.
- the operating cycle of the engine is represented in the form of a hatched surface in a pressure diagram of the gases contained in the cylinder as a function of the volume occupied by these gases.
- the engine operating point describes the curve 40 delimiting the cycle at its lower part when the piston moves up and the upper limit curve 41 of the cycle when the piston 30a moves down.
- the piston 30a At the end of compression, the piston 30a reaching its top dead center, the volume V is minimum. Ignition followed by combustion occurs during compression. The pressure in the cylinder reaches soon after its maximum and the piston moves down.
- the volume of the gases in the cylinder has a value VO and the pressure of these gases, a value P2.
- the engine operating point corresponds to point A in FIG. 3.
- the valve 38 lifts and the gases contained in the cylinder chamber 30 fill the entire duct 35 possibly including a storage capacity for pressurized gas downstream valve 38.
- downstream part of the conduit 35 is, when the apertures 37 open, at a pressure below P2.
- the piston 30a continues to move downwards and discovers the exhaust ports.
- the pressure decreases in the cylinder chamber during the exhaust and sweeping phases with fresh air.
- the valve 38 closes very quickly as soon as the pressure is less than P2. Closing the valve 38 therefore ensures the constitution of a gas reserve at a pressure substantially equal to P2.
- the cam 34 controls the opening of the valve 33 of the injector 32 (operating point I). Liquid fuel is sprayed and injected into the upper part of the cylinder 30 by the pressure gas P2 retained in the duct 35 and / or the storage capacity, downstream of the valve 38.
- the pneumatic injector can be designed to close sufficiently quickly, this being determined during the design or the development of the engine by the law of the cam 34.
- the pressure downstream of the valve 38 is established at a value lower than P2.
- the fuel mixture contained in the cylinder is then compressed by the piston 30a.
- the upper part of the piston 30a masks the opening 37 at the start of the compression (point B in FIG. 3).
- the residual volume in the cylinder is VO and the gas pressure is P1.
- the pressure P1 as it is visible on the diagram of FIG. 3, is notably lower than the pressure P2.
- the pressure in the conduit 35 upstream of the valve 38 therefore becomes established at the value P1 ⁇ P2. This position of the piston 30a is shown in FIG. 1.
- the conditions of the injection are such that the pressure downstream of the valve 38 is established at a value P3 between P2 and P1.
- valve 38 opens during compression to allow the pipe 36 to reach a pressure close to P1 when the rise of the piston masks the light 37.
- the continuation proceeds in the same way in both cases.
- valve 38 therefore remains closed until the point of operation returns to A (configuration of Figure 2).
- the piston 30a discovers the light 37, so that the upstream part of the conduit 35 is brought to pressure P2> P3.
- the valve 38 opens and the downstream part of the conduit 35 constituting the injection gas reserve capacity is recharged with burnt gases at pressure P2.
- FIG. 4 there is shown an alternative embodiment of the injection device 32 shown in Figures 1 and 2.
- the corresponding elements in Figures 1 and 2 on the one hand and 4 on the other hand bear the same references with the exponent 'with regard to the elements of the device shown in FIG. 4.
- the injection device 32 ' comprises a conduit 36' similar to the conduit 36 of the device shown in Figures 1 and 2 communicating at one of its ends by a lumen 37 'with the inner chamber of the cylinder 30' and, at its other end with the injector chamber communicating via the valve 33 'with the upper part of the cylinder 30'.
- a valve 38 ' is interposed on the conduit 36' and separates this conduit 36 'into an upstream part communicating with the light 37' of the cylinder 30 'and a downstream part communicating with the pneumatic injector.
- the conduit 36' is connected by means of a conduit 50 and a valve 51 with a source of fresh air which can be constituted by atmospheric air, the valve 51 having its entry into the open air.
- the chamber of this cylinder 30' can be put under vacuum by the exhaust wave effects. This vacuum causes the valve 51 to open and the upstream portion of the duct 36 'to sweep through the cylinder 30 with fresh air.
- the device according to the invention has in all cases the advantage of using, for spraying and injecting fuel, pressurized gas available in the engine itself.
- This pressurized gas can also be taken near the place where it is used for injecting fuel into the cylinder.
- Gas pressures can also be very high compared to the pressure in the cylinder at the time of injection, which improves the quality of the fuel spraying and injection.
- the invention applies not only to two-stroke engines but also to any reciprocating internal combustion engine in which an introduction and a sweep of fresh air and a pneumatic injection of fuel are produced independently.
- valve 20 33, 43, 46 or 33 ′ an automatic valve functioning as a valve, a rotary plug or an electromagnetically controlled valve.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Claims (5)
- Vorrichtung zur pneumatischen Injektion von Kraftstoff in einen Zylinder (30, 30') eines Hubkolbenmotors mit innerer Verbrennung, umfassend wenigstens einen Zylinder (30, 30'), ein Mittel zum Speisen des Zylinders mit nicht-vergaster Spülluft sowie eine pneumatische Kraftstoffeinspritzvorrichtung (32, 32'), die einen pneumatischen Injektor umfasst, der eine in einen Zylinder mündende Kammer hat, ein Speisemittel des pneumatischen Injektors mit flüssigem Kraftstoff und ein Mittel zum Speisen des pneumatischen Injektors mit Gas unter Druck für die Zerstäubung und Injektion des Kraftstoffs in zerteilter Form im Zylinder (30, 30'), wobei dieses Speisemittel (35) für den Injektor mit Gas unter Druck mit der Kammer des Zylinders des Motors zusammenwirkt und durch einen Speicherraum gebildet wird, der mit der Kammer des Zylinders verbunden ist, in welchem die pneumatische Injektion vermittels des pneumatischen Injektors stattfindet, der im oberen Teil des Zylinders in Höhe eines Sitzes einer Regelklappe (33, 33') mündet, dadurch gekennzeichnet, daß die Vorrichtung (35, 35') zum Speisen des Injektors (32) mit Gas unter Druck gebildet wird durch eine Leitung, die mit einem ihrer Enden mit der Kammer des Zylinders (30, 30') über einen Schlitz (37) in Verbindung steht, der auf der Innenfläche der Kammer dieses Zylinders (30) angeordnet und durch den Kolben (30a) überstrichen wird und an ihrem anderen Ende mit der Kammer des pneumatischen Injektors (32) in Verbindung steht, der in die Kammer des Zylinders (30, 30') in Höhe eines Ventilsitzes (33, 33') mündet und daß sie im übrigen eine Ventilklappe (38, 38') umfasst, die an der Leitung (36, 36') angeordnet ist und den anströmseitigen Teil dieser Leitung in Verbindung mit der Kammer des Zwischenzylinders des Schlitzes (37, 37') und einen abströmseitigen Teil in Verbindung mit der Kammer des Injektors (32, 32') begrenzt, wobei die ventilklappe (38, 38') durch Differentialdruck in der Richtung von der Anströmseite zur Abströmseite verschoben werden kann.
- Injektionsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Ventil (33, 33') betätigt wird durch eine Nocke (34) einer Form und einer Anordnung, die das Öffnen des Ventils zweimal pro Zyklus sicherstellt, einmal vor der Kompression zur Herbeiführung der Kraftstoffinjektion und ein zweites Mal während der Entspannung zur Realisierung des Nachladens des Raumes mit Gas unter Druck.
- Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der anströmseitige Teil der Leitung (36') vermittels einer Leitung (50) und einer Ventilklappe (51) mit einer Spülgasquelle der anströmseitigen Leitung (36') verbunden ist.
- Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der pneumatische Injektor einen Kraftstoffinjektor mit diskontinuierlichem Betrieb umfasst.
- Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß dieser Kraftstoffinjektor nur arbeitet, wenn dieses Ventil geschlossen ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8718359 | 1987-12-30 | ||
FR8718359A FR2625532B1 (fr) | 1987-12-30 | 1987-12-30 | Procede d'injection pneumatique de carburant dans un cylindre d'un moteur alternatif a combustion interne et dispositif d'injection correspondant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0323368A1 EP0323368A1 (de) | 1989-07-05 |
EP0323368B1 true EP0323368B1 (de) | 1994-06-22 |
Family
ID=9358434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88403381A Expired - Lifetime EP0323368B1 (de) | 1987-12-30 | 1988-12-30 | Vorrichtung zur pneumatischen Kraftstoffeinspritzung |
Country Status (6)
Country | Link |
---|---|
US (1) | US5027765A (de) |
EP (1) | EP0323368B1 (de) |
JP (1) | JP2777893B2 (de) |
DE (1) | DE3850378T2 (de) |
FR (1) | FR2625532B1 (de) |
IN (1) | IN172186B (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2668546B2 (fr) * | 1990-05-21 | 1994-10-07 | Inst Francais Du Petrole | Moteur a deux temps pourvu d'un dispositif d'injection pneumatique de melange carbure. |
FR2662213A1 (fr) * | 1990-05-21 | 1991-11-22 | Inst Francais Du Petrole | Procede d'injection pneumatique de carburant dans un moteur a deux temps et moteur a deux temps correspondant. |
GB2304811A (en) * | 1995-08-26 | 1997-03-26 | Ford Motor Co | Engine intake fuel atomisation |
US6079379A (en) | 1998-04-23 | 2000-06-27 | Design & Manufacturing Solutions, Inc. | Pneumatically controlled compressed air assisted fuel injection system |
US6273037B1 (en) | 1998-08-21 | 2001-08-14 | Design & Manufacturing Solutions, Inc. | Compressed air assisted fuel injection system |
US6293235B1 (en) | 1998-08-21 | 2001-09-25 | Design & Manufacturing Solutions, Inc. | Compressed air assisted fuel injection system with variable effective reflection length |
US6460494B1 (en) | 2000-06-07 | 2002-10-08 | Design & Manufacturing Solutions, Inc. | Compressed air assisted fuel injection system with reflection wave and variable restriction injection port |
WO2005019635A1 (en) * | 2003-08-26 | 2005-03-03 | Tyteam Pty Limited | Direct injected two stroke combustion |
US9677468B2 (en) * | 2014-04-10 | 2017-06-13 | Kan K Cheng | Two-cycle pneumatic injection engine |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE210259C (de) * | ||||
GB191410643A (en) * | 1913-05-23 | 1914-08-27 | Aksel Christian Frede Gottlieb | Improved Four-stroke-cycle Internal Combustion Engine. |
US1377139A (en) * | 1919-04-09 | 1921-05-03 | Murphy John Francis | Internal-combustion engine |
FR630487A (fr) * | 1926-06-03 | 1927-12-03 | Système d'injection pour moteurs à combustion interne | |
FR901122A (fr) * | 1943-09-04 | 1945-07-18 | Prospection Ind Soc D | Dispositif d'injection pour carburant volatil |
CH270337A (fr) * | 1946-10-17 | 1950-08-31 | Chausson Usines Sa | Procédé de fonctionnement d'un moteur à explosions à deux temps, et moteur pour la mise en oeuvre de ce procédé. |
PL97947B3 (pl) * | 1974-06-18 | 1978-03-30 | Politechnika Krakowska | Silnik spalinowy czterosuwowy wielocylindrowy z bezpompowym wtryskiem paliwa z zaplonem iskrowym |
JPS5174107A (ja) * | 1974-11-26 | 1976-06-26 | Politechnika Krakowska | Nikoteitashirindahibanatenkahonpuresufunshanainenkikan |
DE2714090A1 (de) * | 1977-03-30 | 1978-10-05 | Auguste Moiroux | Brennkammervorrichtung fuer verbrennungskraftmaschinen |
JPS59687B2 (ja) * | 1977-09-27 | 1984-01-07 | トヨタ自動車株式会社 | 内燃機関の燃焼室 |
JPS6022170B2 (ja) * | 1977-12-02 | 1985-05-31 | トヨタ自動車株式会社 | 多気筒内燃機関の燃焼促進装置 |
JPS6041206B2 (ja) * | 1978-01-17 | 1985-09-14 | トヨタ自動車株式会社 | 内燃機関の燃焼室 |
JPS56124266A (en) * | 1980-03-03 | 1981-09-29 | Mitsubishi Electric Corp | Semiconductor device |
JPS5713269A (en) * | 1980-06-30 | 1982-01-23 | Komatsu Ltd | Fuel injection device |
JPS57191451A (en) * | 1981-05-19 | 1982-11-25 | Diesel Kiki Co Ltd | Mechanism for supplying compressed air to fuel injection valve |
US4406260A (en) * | 1982-02-08 | 1983-09-27 | General Motors Corporation | Valved prechamber diesel engine and methods of operating |
FR2575523B1 (fr) * | 1984-12-28 | 1989-04-07 | Inst Francais Du Petrole | Dispositif et procede d'injection de carburant assiste par air ou gaz comprime dans un moteur |
JPS6388262A (ja) * | 1986-09-30 | 1988-04-19 | Suzuki Motor Co Ltd | 内燃機関の酸素富化装置 |
JPS6392076A (ja) * | 1986-10-06 | 1988-04-22 | Mitsubishi Electric Corp | 半導体レ−ザ |
US4787343A (en) * | 1986-11-07 | 1988-11-29 | Walbro Corporation | Combustion enhancer for internal combustion engines |
-
1987
- 1987-12-30 FR FR8718359A patent/FR2625532B1/fr not_active Expired - Fee Related
-
1988
- 1988-12-30 DE DE3850378T patent/DE3850378T2/de not_active Expired - Fee Related
- 1988-12-30 US US07/292,530 patent/US5027765A/en not_active Expired - Fee Related
- 1988-12-30 JP JP63335688A patent/JP2777893B2/ja not_active Expired - Lifetime
- 1988-12-30 EP EP88403381A patent/EP0323368B1/de not_active Expired - Lifetime
-
1989
- 1989-05-09 IN IN362/MAS/89A patent/IN172186B/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE3850378D1 (de) | 1994-07-28 |
FR2625532B1 (fr) | 1993-04-23 |
US5027765A (en) | 1991-07-02 |
FR2625532A1 (fr) | 1989-07-07 |
DE3850378T2 (de) | 1994-11-17 |
JP2777893B2 (ja) | 1998-07-23 |
JPH02223669A (ja) | 1990-09-06 |
EP0323368A1 (de) | 1989-07-05 |
IN172186B (de) | 1993-05-01 |
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