EP0323368B1 - Dispositif d'injection pneumatique de carburant - Google Patents

Dispositif d'injection pneumatique de carburant Download PDF

Info

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
Application number
EP88403381A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0323368A1 (fr
Inventor
Pierre Duret
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP0323368A1 publication Critical patent/EP0323368A1/fr
Application granted granted Critical
Publication of EP0323368B1 publication Critical patent/EP0323368B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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)
EP88403381A 1987-12-30 1988-12-30 Dispositif d'injection pneumatique de carburant Expired - Lifetime EP0323368B1 (fr)

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 (fr) 1989-07-05
EP0323368B1 true EP0323368B1 (fr) 1994-06-22

Family

ID=9358434

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88403381A Expired - Lifetime EP0323368B1 (fr) 1987-12-30 1988-12-30 Dispositif d'injection pneumatique de carburant

Country Status (6)

Country Link
US (1) US5027765A (ja)
EP (1) EP0323368B1 (ja)
JP (1) JP2777893B2 (ja)
DE (1) DE3850378T2 (ja)
FR (1) FR2625532B1 (ja)
IN (1) IN172186B (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE210259C (ja) *
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

Also Published As

Publication number Publication date
DE3850378D1 (de) 1994-07-28
JPH02223669A (ja) 1990-09-06
JP2777893B2 (ja) 1998-07-23
IN172186B (ja) 1993-05-01
DE3850378T2 (de) 1994-11-17
FR2625532B1 (fr) 1993-04-23
FR2625532A1 (fr) 1989-07-07
EP0323368A1 (fr) 1989-07-05
US5027765A (en) 1991-07-02

Similar Documents

Publication Publication Date Title
EP0189716B1 (fr) Dispositif d'injection de carburant assisté par air ou gaz comprimé dans un moteur
EP0235481B1 (fr) Dispositif d'introduction de gaz sous pression dans une chambre de combustion d'un moteur alternatif à combustion interne
EP0311499B1 (fr) Moteur à deux temps à injection pneumatique et à restriction de débit à l'échappement
EP0435730B1 (fr) Moteur à deux temps à injection pneumatique commandée
EP0296969B1 (fr) Dispositif d'introduction sous pression de mélange carburé dans le cylindre d'un moteur
EP0323368B1 (fr) Dispositif d'injection pneumatique de carburant
EP0786046B1 (fr) Moteur deux temps a injection pneumatique de melange carbure
EP0376836B1 (fr) Dispositif pour introduire un mélange carburé dans une chambre d'un moteur à deux temps
FR2649157A1 (fr) Moteurs a deux temps a injection pneumatique et a restriction de debit dans au moins un conduit de transfert
EP0458670B1 (fr) Procédé d'injection pneumatique de carburant dans un moteur à deux temps et moteur à deux temps correspondant
EP0346188B1 (fr) Dispositif et méthode d'introduction sous pression de mélange carburé dans le cylindre d'un moteur
EP0406083B1 (fr) Dispositif de contrôle de début d'introduction sous pression du mélange carbure dans un moteur à combustion interne et son application au moteur deux temps
FR2643943A1 (fr) Systeme d'emprisonnement d'air pour cylindre, equipe d'un ressort pneumatique
EP0704017B1 (fr) Dispositif d'alimentation en melange air-carburant d'un moteur a explosion a deux temps
FR2496757A1 (fr) Dispositif pour alimenter en melange carbure un moteur deux temps avec introduction d'air a travers le carter
FR2662214A1 (fr) Moteur a deux temps a injection pneumatique de carburant et a commande d'injection par un boisseau rotatif.
EP0406078B1 (fr) Moteur deux temps à boisseaux tournants et utilisations d'un tel moteur
EP0507648B1 (fr) Moteur à deux temps à contrôle sélectif de la charge introduite dans la chambre de combustion
FR2737253A1 (fr) Moteur a combustion interne a deux temps
FR2459876A1 (fr) Systeme d'admission pour un moteur a explosion, et moteur a explosion comportant un tel systeme
FR2629518A1 (fr) Moteur a combustion interne et culasse pour un tel moteur
FR2662213A1 (fr) Procede d'injection pneumatique de carburant dans un moteur a deux temps et moteur a deux temps correspondant.
FR2523211A1 (fr) Moteur a deux temps, notamment pour motocyclette
FR2676503A1 (fr) Moteur thermique.
FR2656656A1 (fr) Moteur a deux temps a injection pneumatique commandee.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19890111

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE GB IT NL SE

17Q First examination report despatched

Effective date: 19910227

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE GB IT NL SE

ITF It: translation for a ep patent filed

Owner name: MARIETTI E GISLON S.R.L.

REF Corresponds to:

Ref document number: 3850378

Country of ref document: DE

Date of ref document: 19940728

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940701

EAL Se: european patent in force in sweden

Ref document number: 88403381.2

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19990924

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19991122

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19991222

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19991229

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19991231

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001230

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001231

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001231

BERE Be: lapsed

Owner name: INSTITUT FRANCAIS DU PETROLE

Effective date: 20001231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010701

EUG Se: european patent has lapsed

Ref document number: 88403381.2

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20001230

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20010701

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20011002

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051230